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Publication numberUS3156182 A
Publication typeGrant
Publication dateNov 10, 1964
Filing dateNov 23, 1962
Priority dateNov 23, 1961
Also published asDE1165045B
Publication numberUS 3156182 A, US 3156182A, US-A-3156182, US3156182 A, US3156182A
InventorsRitzerfeld Gerhard, Ritzerfeld Wilhelm
Original AssigneeRitzerfeld Gerhard, Ritzerfeld Wilhelm
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rotary offset printing machines with shiftable blankets
US 3156182 A
Images(11)
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Description  (OCR text may contain errors)

1954 w. RITZERFELD ETAL 3,156,182

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS l1 Sheets-Sheet 1 Filed Nov. 25, 1962 ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Jn ven fars NOV. 1964 w. RITZERFELD ETAL 3,156,182

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Filed Nov. 23, 1962 ll Sheets-Sheet 5 Fly. 3

10, 1964 w. RITZERFELD ETAL 3,

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS ll SheetsSheet 4 Filed NOV. 23, 1962 1964 w. RITZERFELD ETAL 3,156,132

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Filed NOV. 25, 1962 ll Sheets-Sheet 5 10, 1954 w. RITZERFELD ETAL 3,156,132

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Filed Nov. 25, 1962 11 Sheets-Sheet e Fig.6

10, 1964 w. RlTZERFELD ETAL 3,156,183

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Filed Nov. 25, 1962 11 Sheets-Sheet 7 1964 w. RITZERFELD ETAL 3, 5 8

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKET-S ll Sheets-Sheet 8 Filed Nov.

RN QNN SN .70 venfors AM; a wa /kw flv /M T964 :RITZERFE'LID FETAL 5,

ROTARY OFFSET PRINTING 'M'A'CHJLNES WITH "SELF-TABLE .BLANKETS Filed NOV. 23, 1962 '11 Sheets-Shem 9 Fig.9

Nov. 10, 1964 W. RITZERFELD ET AL ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE B LANKETS Filed Nov. 23, 1962 ll Sheets-Sheet l0 Nov- 1964 w. RITZERFELD ETAL 3,156,132

ROTARY OFFSET PRINTING MACHINES WITH SHIFTABLE BLANKETS Filed Nov. 23, 1962 ll Sheets-Sheet 11 a 1 E? Y I E\ S s 5? a N Q l IE :l .F Tl J, .L 2

Jnvemors W M f /7 %%M {JAM United States Patent 3,156,182 ROTARY OFFSET PRINTENG MACHINES WITH Sl-HFTABLE ELANKETS Wilhelm Ritzerfeld, Schorlemer Aliee 14, Berlin-Bahlem, Germany, and Gerhard Ritzerfeld, Franzenshader Strasse 21, Berlin-Grunewald, Germany Filed Nov. 23, 1962, Ser. No. 239,702 (Ilaims priority, application Germany, Nov. 23, 1961, R 31,528, R 31,529 34 Claims. (Cl. 1tll142) The present invention relates to an offset printing machine with a shiftable blanket, and more particularly to an offset printing machine which permits the printing of selected lines of a text on a copy sheet adjacent the imprint of the head section of a text.

Offset printing machines according to the prior art have the disadvantage that heavy offset inks cause an adherence of the copy sheet to the offset roller so that it is difficult to maintain the copy sheet at a standstill during a selective printing operation in which the offset blanket has to be repeatedly separated from the copy sheet.

Another disadvantage of the prior art construction is that substantial masses have to be operated for separating the offset blanket from the printing form and from the copy sheet.

It is one object of the present invention to overcome the disadvantages of known offset printing machines, and to provide an offset printing machine which reliably operates during selective printing operations in which the copy sheet is stopped.

Another object of the present invention is to provide offset printing machines of simple construction for the purpose of the printing of selected lines or parts of the text of a printing form.

Another object of the invention is to provide offset printing machines permitting printing of selected lines of a text section of the printing form on a copy sheet adjacent the head section of a printing form.

Another object of the present invention is to provide offset printing machines in which the blanket of the offset roller or cylinder is stepwise shifted after each revolution so that a different part or line of the transferred copy of a text section is located on a particular section of the periphery of the offset roller, and preferably adjacent the transferred copy of the head section or" the printing form.

Another object of the present invention is to provide offset printing machines with an offset roller having a fixed blanket for the head section of a printing form, and a shiftable blanket for the text section of the printing form.

Another object of the present invention is to shift the shiftable blanket of an offset printing machine in such a manner that one or several lines of the text can be selectively imprinted on the copy sheet.

Another object of the invention is to provide an offset printing machine for printing on copy sheets of the same size, a head section of the same length, and selected fixed sections of different lengths.

With these objects in View, one embodiment of the invention comprises first roller means, and holder means for holding a printing form, and preferable second holder means for holding a copy sheet on peripheral surfaces defined by the first roller means; second roller means including an offset roller, blanket means having a peripheral portion located on the surface of the offset roller, and transporting means for transporting the blanket means so that the peripheral portion is shifted; supporting means supporting the roller means for movement between a transfer position cooperating for transferring a copy of the ice printing form to the peripheral portion of the blanket means, a printing position in which the roller means cooperate for printing by the peripheral portion of the blanket means at least part of the transferred copy on a copy sheet, and preferably a neutral position in which the first and second roller means are spaced from each other; operating means for moving the roller means between the above-mentioned positions; and control means including selected means for operating the transporting means blanket parts carrying copies of selected parts of v the printing form are positioned for printing on a copy sheet.

In accordance with the present invention, the control means are operated after each revolution of the oifset roller so that the blanket means is shifted and different parts of a transferred copy are printed on successive copy sheets, preferably in the same position and on the same part of the copy sheet. In the preferred embodiment of the invention, the blanket means include a fixed peripheral portion on the offset roller, and the fixed peripheral portion is used to receive a transferred copy of the head section of the printing form, and to print the head section on the copy sheet. The shiftable peripheral blanket portion is shifted in such a manner that the imprint of the selected part of the text section is located adjacent the imprint of the head section, irrespective of how far the selected part of the text section is spaced from the head section on the printing form.

In the preferred embodiment of the invention, the offset roller is hollow, and the shiftable blanket means is drawn into the interior of the offset roller by a stepping mechanism. The stepping mechanism is actuated during each revolution of the offset roller by engagement between an actuating member of the stepping mechanism, and a stationary control member which projects into the circular path of movement of the actuating member of the stepping mechanism. If only one control member is provided, the blanket will be shifted after each revolution, so that successive lines of the text section will be imprinted on the copy sheet.

In a preferred embodiment of the invention, a plurality of control members is provided about the periphery of the offset roller, and each control member can be selectively moved by a selector member to an operative position located in the circular path of movement of the actuating member of the stepping mechanism so that the shifting of the blanket means displaces the blanket means corresponding to a number of lines of the text section which can be selected by the operator.

Such selection is preferably carried out by moving selected control members from a normal inoperative position to an operative position by electro-magnetic means in the circuits of which selector switches are located. The selector switches are respectively associated with selector members which are keys of a key board used by the operator to select one or several lines of the text for printing during successive revolutions of the offset roller, a new copy sheet being fed to the bight of the offset roller after each revolution. According to one embodiment of the invention, the offset roller cooperates with a main roller on which the printing form is mounted, and with the counter pressure roller. Electro-magentic operating means shift the offset roller between the transfer position co operating with the printing form on the main roller, a printing position cooperating with the copy sheet on the counter pressure roller, and a neutral position spaced from both rollers. The movement between the neutral position of the printing position is only carried out when a selected line of the transferred copy of the text section is located in the printing line between the offset roller and the counter pressure roller.

If it is intended to print the entire text section, the olfset roller is maintained in its neutral position, and the counter pressure roller is moved to a printing position cooperating with the offset roller and held in this printing position until the entire text is printed on a copy sheet held by a holder on the counter pressure roller.

In a modified construction, the olfset roller is only moved between a neutral position and a transfer position, and the printing of at least a part of the copy of the text section on the blanket on the copy sheet is obtained by moving the counter pressure roller to and from the printing position under control of rotary cams running in synchronism with the offset roller.

Another embodiment of the invention eliminates the counter pressure roller, and the offset roller cooperates with a main roller having first holder means for holdling a printing form on one part or segment of the peripheral surface thereof, and a second holder means for holding a copy sheet on another part or segment of the peripheral surface of the main roller. The offset roller successively cooperates with the printing form and the copy sheet during each revolution of the main roller, and consequently has substantially half the diameter of the main roller.

During the first part of the revolution of the main roller, a copy of the head section of the printing form is transferred to the fixed peripheral portion of the blanket means, and a copy of the entire text section of the printing form is transferred to the shiftable peripheral portion of the blanket means on the oifeset roller. During the second part of the revolution of the main roller, the offset roller is moved to a printing position only when the fixed blanket forms a printing line with the copy sheet, and when a selected part of the copy of the text section on the blanket means passes through the printing line with the copy sheet.

Successive lines of the text section may be printed during consecutive revolutions of the main roller, while a new copy sheet is fed to the main roller after each revolution thereof. During each successive revolution, the head section of the printing form is brought into contact with the fixed portion of the blanket to transfer again a copy of the head section to the fixed blanket portion, which is necessary since the head section is printed on each newly fed copy sheet. Since different parts of the text section are printed on successive copy sheets, the copy of the text section is only once transferred from the printing form to the shiftable peripheral portion of the blanket.

The shifting of the blanket after each revolution is again obtained by stepping mechanism under control of control members which can be selectively placed in the path of the actuating member of the stepping mechanism. A key board is provided for this purpose. In all embodiments of the invention, the movement of the offset roller is controlled by rotary contact arm successively engaging contacts which are connected to the selector switches, so that the movement of the olfset roller is synchronized with the shifting of the blanket.

While in the preferred embodiments of the invention, the offset roller is moved between inoperative and operative positions by electro-magnetic operating means, it is also contemplated to use rotary cam-s for this purpose.

In all embodiments of the invention, the circuit of the electro-magnetic control and operating means includes relays which bridge the respective circuit parts so that a continuous cooperation between the oifset roller and the main roller carrying the printing form can be obtained for the purpose of producing prints of the entire text section, in addition to the head section.

The preferred embodiment of the invention, in which the printing form and the copy sheet are located on a main roller whose shaft is stationary, has the advantage that the inking devices and moistening devices can also be made stationary, and that the offset cylinder, which has to be moved between inoperative and operative positions can be made small so that very small masses have d to be moved when the offset cylinder is moved toward the main roller or away from the same.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together With additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

FIG. 1 is a side elevation, partly in cross section, with the walls of the machine omitted for the sake of clarity, and illustrating a first embodiment of the invention;

FIG. 2 is a cross sectional view illustrating a first embodiment of the blanket construction for the embodiment of FIG. 1 on an enlarged scale;

FIG. 3 is a fragmenary plan view of the embodiment of FIG. 1;

FIG. 4 is a cross sectional view illustrating on an enlarged scale, an offset roller with a modified blanket construction which may be used in the embodiment of FIG. 1;

FIG. 5 is a fragmentary side elevation illustrating operating and control means for the embodiment of FIG. 1 on an enlarged scale;

FIG. 6 is a diagram illustrating the electric circuit of the embodiment of FIG. 1;

FIG. 7 is a fragmentary schematic side view partially in cross section, illustrating a modification of the embodiment of FIG. 1 in which the counter pressure roller is shifted;

FIG. 8 is a fragmentary side view, partially in cross section, illustrating a second embodiment of the invention, the side wall of the machine being omitted for clarity;

FIG. 9 is a fragmentary cross sectional view illustrating the offset roller of the embodiment of FIG. 8 on an enlarged scale;

FEG. 10 is a plan View of the embodiment of FIG. 8; and

FIG. 11 is a diagram illustrating the electric circuit of the embodiment of FIG. 8.

Referring now to the drawings, and more particularly to FIGS. 1 to 4, main roller 1 is mounted on a shaft 3 and has a holding means for holding on the periphery thereof the printing form 2. Shaft 3 is continuously rotated by a motor, not shown. A moistening device including rolls to 6, and a container 7, and an inking device including rollers 8 to 12 and an ink supply means 13, cooperate with the printing form 3 to prepare the same for the printing process.

An offset roller 14- is mounted on a shaft 115, and is driven in synchronism with the rotation of main roller 1 by the gear train 16, l7, l8 and 19 which is only schematically indicated by chain line in FIGS. 1, 2 and 3 for the sake of clarity.

A counter pressure roller 26 is mounted on a shaft 21, and is continuously driven through a gear train 22, 23, 2 4 from gear 19 which is secured to the shaft 15 of offset roller 14.

Shaft 21 is mounted on lever means 116 which can be rocked about a shaft 117 in the direction of the arrows D, C in FIG. 1, and which can be arrested in two positions by engagement between a spring-loaded catch 11.3, and two notches 119 and 126* in lever means 11.6. A pair of stationary stops define the two shifted positions of lever means 116, and thereby two positions of the counter pressure roller 20 which is movable with lever mean 116 to a position advanced toward offset roller 14 as indicated in FIG. 1 by chain lines.

Counter pressure roller 2i has a holding means 56 for holding a copy sheet. Copy sheets 55 are automatically supplied to holding means 56 by feeding means 54. The feeding operation is conventional, and not an object of the present invention.

The offset roller 14- has rubber blanket means including a fixed blanket 25 which is held by two clamping members 55a, located in recesses of the hollow offset roller 14, and holding the fixed blanket on a corresponding, comparatively short peripheral surface portion of offset roller 14. Instead of clamping blanket 25 to the offset roller, the blanket 25 may be permanently vulcanized to the peripheral surface of the offset roller.

Offset roller 14 is provided with a movable rubber blanket 26 which passes through slots in the peripheral Wall of offset roller 14 into the interior of the same so that only a portion of blanket 26 is located on the peripheral surface of oifsetroller 14. One end of blanket 26 is secured to a take-up reel 27, and the other end of blanket 26 is secured to a let-off reel 48, both reel being mounted in the interior of the offset roller. Guide roller 46 and 47 guide the movable blanket from the periphery of offset roller 14 toward reels 2'7 and 48. A gear 3% is turnable on shaft 15, and meshes with a pair of gears 28 and 31 which are respectively secured to reels 27 and 48. Gear 313* meshes with a gear 29 which is secured to a ratchet wheel 32, and to a common shaft 34 which is mounted in the side walls of offset roller 14. A pawl 35, turnable on a pin 36, is biased by a spring 37 to hold ratchet wheel 32. On one side wall of offset roller 14-, a shifting pawl 38 is mounted turnable about a pin 39, and is biased by spring 40 to engage a stop 41. Shifting pawl 38 has a free end carrying a roll 42 which cooperates with one or several control members 43 during rotation of offset roller 14, as will be described hereinafter in greater detail.

Whenever shifting pawl 33 is actuated by a control member 43 against the action of spring 46, ratchet 32 turns one step while raising pawl 35 against the action of spring 37. A transporting sprocket 44 on shaft 34 turns with ratchet 32, and engages perforations 4 1a along one longitudinal edge of blanket 26 which is supported on the other side by a transporting roller 45. Gears 28 to 31 turn simultaneously so that blanket 26 is shifted one step and wound up on the take-up reel 27, while being unwound from the let-off reel 48.

Shaft is mounted in lever means 49 which are turnable about a shaft 5th for moving offset roller 14 toward and away from main roller 1 and counter pressure roller 20. The two lever arms 49 have aligned bores in which an eccentric shaft 51 is turnably mounted. Shaft 51 is supported in bearings on the side walls of the frame of the machine, and fixedly connected to a lever 52 which can be rocked for efiecting rocking movement of lever means 49 in the direction of the arrow B, C in FIG. 5.

The end of lever 52 has a slot into which a pin 76 of a shiftable member 75 projects. A spring 79 is secured to lever 52 and to a fixed pin 80, and tend to hold lever 52 in a neutral position, not illustrated, in which offset roller 14 is spaced from main roller 1 and counter pressure roller 21?. Two electro-magnetic means 78 and 81, see also FIG. 6 have armature members 77 and 82 connected to the connecting member 75. When electromagnetic means 81 is energized, lever 52 is shifted to the left as viewed in the drawing and in the direction of the arrow A in FIG. 5, to move offset roller 14 toward counter pressure roller 2%. When electro-magnetic means 73 is energized, lever 52 moves to the position shown in FIG. 5 in solid lines so that offset roller 14 cooperates with main roller 1. if the electr c-magnetic means 7%; and 31 are not energized, spring 79 moves lever 52 to its neutral position in which offset roller 14 is spaced from main roller 1 and counter pressure roller 211.

FIG. 4 illustrates a modified embodiment of the offset roller. While in the embodiment of FIG. 2, a fixed blanket is provided for the head section of the text, and a shiftable blanket 26 for the text portion, the embodiment of FIG. 4 pnovides a blanket 60 one end of which is fixedly clamped to the periphery of the offset roller 14' by clamping means 61 located in a recess of the hollow offset roller 14%. The blanket 60 is guided over rollers 62 and 64 into the interior of the offset roller where it passes about a transporting cylinder 63 secured to a pair of arms 67 which are connected by a hollow shaft 68 turnable on shaft 15. A gear 69 is fixed to the hollow shaft or sleeve 68, and meshes with gears 71) and 71. Gear 71 is fixed to the let-off shaft 66 while gear '79 is fixed to the shaft '72., both shafts being mounted in the end plates of offset roller 14-. A ratchet wheel 32 is held by a locking pawl 37 which is biased by spring 37. A spiral spring 33 urges ratchet wheel 32 to turn, but such turning movement is prevented by the engaged locking pawl 35. A stepping pawl 38 is mounted on shaft 39 and has roller 42 which is located to engage the control member or members 43 during rotation of offset roller 14'. During each revolution of offset roller 14', transporting pawl 38 will effect turning of shaft 72 through one step when engaging a control member 43, and such stepwise motion will be transmitted by gears 69, 7t 71 so that arm means 67 are turned one step with transporting roller 63 whereby the portion of blanket 68 located on the peripheral surface of olfset roller 14' between roller 64 and 6:? is shifted one step, and a section of the blanket is pulled into the interior of otfset roll-er 14', while a corresponding section of the blanket is wound off the let-off shaft or reel 66.

Referring now to FIG. 6, which illustrates the circuit for shifting the blanket in the constructions of FIG. 2 or 4, a stationary contact means 35 cooperates with the rotary contact means which is driven from gear 19 on shaft 15 through a pair of gears 94 and 95 meshing with a gear 93 which is secured to the shaft of the rotary contact arm 90, as best seen in FIG. 5. A series of stationary contacts 1% to corresponding to lines or parts of the text section of the printing form, and two longer stationary contacts 1&5 and 111 are mounted on the stationary contact means 89 so as to be successively engaged by a contact 1124- on the rotary contact arm 91). A contact 1114a is connected to contact 104 and slides on a circular slide ring 1114b which is connected to a contact of a relay 98 which also operates a contact 114. Contact 115 is connected to electro-magnetic means 91, 81 which effect shifting of rocking lever 52 to the left as viewed in FIG. 5, and to electro-magnetic means 92, 78 which shift rocking lever 52 in the opposite direction. Electro-magnetic means 81, 91 is connected to a switch 112 which is operated by the feeding member 59 by which a copy sheet is fed to the holder 56 of the counterpressure roller 29. Another switch 113 is also operated by the feeding member 54.

Switches 112 and 113 are respectively connected to two series of switches 99 to 103 and 99a to 103a, pairs of which are simultaneously operated by manually controlled selector keys T1 to T5. Switches 99a to 103:; are respectively connected to the stationary contact buttons 1116 to 110, while switches 99 to 1113 are respectively connected to electro-magnetic means 83 to 87, each of which controls a control member 43, which are uniformly spaced about the periphery of offset roller 14 or M, and which are shifted to an operative control position located in the path of movement of the transporting means 38, 42 when the respective electro-magnetic means 83 to 87 is energized.

A main switch TE is connected tota switch 97 of a pair of switches 97, 96 having operating arms 9e41, 97a located in the path of movement of contact arm 90, and being operated by the same to open switch 96, and to close the switch 97 when engaged by contact arm 91?.

The elongated contact 105 is also connected to the series of switches 9% to 1tl3a, and to switch 112, while the elongated contact 111 is connected to the electro-magnetic means 81, 91 and 78, 92.

During rotation of contact arm 90, a circuit will be established through any pair of manually operated selector contacts operated by depression of a selector key T1 to T5, and a corresponding control member 43 will be placed in its operative position.

The selector keys T1 to T5 respectively correspond to lines or parts of the text section of the printing form, and by operation of selected keys, the respective sections or parts of the printing form are selected for printing. Consequently, control members 43 are also respectively associated with lines or parts of the text section of the printing form, and serve, by operating of transporting member 38, to place a corresponding line or part of a copy of the text section appearing on blanket 26 in the proper position for printing on the copy sheet.

The embodiments illustrated in FIGS. 1 to 6 are oper ated as follows: At the beginning of a printing operation, the blanket 26, or 6Q, is fully wound up on the let-off reel 48. Main roller 1 with printing form 2, offset roller 14 or 14 with blanket 26 or 60, counter pressure roller 20, and contact arm 90 rotate in synchronism while rollers 1, 14 or 14', and 20 are spaced from each other.

The main switch TE is operated so that the rotary contact arm 99 actuates the switches 96 and 97 by engaging actuator projections 96a and 97a during rotation. Switch 96 i opened, and switch 97 is closed and connects relay 93 to a source of voltage. Contacts 114 and 115 are shifted, and electro-magnetic means 78 is energized during the following revolution so that arm 52 and lever 49 are shifted to the position shown in solid lines in FIG. 5 whereby the fixed blanket portion 25 and the shiftable blanket portion 26 of offset roller 14, and the immovable blanket portion tlb and the movable blanket portion 60a of offset roller 14, are engaged by the head section and by the text section of the printing form 2 which transfer a copy of the entire printing form to the two blanket portions.

If the entire text of the printing form including head section and text section is to be printed on the copy sheet, the operator shifts lever 116 in the direction of the arrow C in FIG. 1, so that counter pressure roller 20 is shifted to the printing position illustrated in chain lines in FIG. 1 in which the printing form 55 thereon receives an imprint of the entire text from the copy on the two portions 25 and 26 of the blanket.

T hereupon, the manually operated lever means 116 is turned back in the direction of the arrow D to the position in which the counter pressure roller 20 is spaced from the surface of the offset roller. In this moment, the feeding member 54 is operated in a conventional manner to feed a copy sheet 55 to the holding means 56 of the counter pressure roller which automatically ejects the old copy sheet and clamps the new copy sheet. The feeding operation is conventional, and not an object of the present invention. It is only necessary that a copy sheet is fed to a position located between the surface of the counter pressure roller and the surface of the blanket on the offset roller.

The main switch TE is released by the operator, and electro-magnetic means 7% is de-energized so that spring '79 pulls locking lever 52 to a neutral position in which offset cylinder 14 is spaced from roller 1 with printing form 2, and from counter pressure roller 26 which is again in the position shown in solid lines in FIG. 1. It is now intended to select certain lines of the text sec tion for printing, while all other lines of the text section of the printing form are to be omitted. The selector keys associated with the respective selected lines are depressed by the operator, for example, if the first two lines of the text section are selected, keys T1 and T2 are operated so that the corresponding switch 99, 99a and 1%, ltttla are closed.

During the above mentioned feeding of the new copy sheet 55, the feeding member 54 closes contacts 112 and 113 so that contact 184 closes the circuit of electro-magnetic means 81 when engaging contact 105 during rotation of contact arm 9%. The energized electro-magnetic means 81 shifts rocking lever 52 to the left in the direction of the arrow A in FIG. 5 so that offset roller 14 moves to a position in which the fixed blanket portion 25, which carries a transferred copy of the head section of the printing form 2, engages a corresponding portion of the copy sheet 55 on counter pressure roller 26 whereby an imprint of the head section of the printing form is made on the copy sheet.

When contact 113 closes, the circuit of the electromagnetic means 83 and 84 is closed through the closed contacts 99 and 1%, and consequently control members 43 are in the operative positions located in the path of movement of transporting pawl 38, 42.

When contact 104 of rotary contact arm @0 successively engages the contact buttons 196, 107, electro-magnetic means (1 is twice energized for a short period of time through closed switches 99a and 108a and switch 112. Electromagnetic means 81 shifts rocking lever 52 to the position shown in chain lines in FIG. 5 and offset roller 14 is moved toward counter pressure roller 26 at the moment in which portions of the blanket carrying the selected lines of the transferred copy of the text section of the printing form pass the printing line with counter pressure roller 20, and consequently corresponding imprints of the selected first and second lines are made on the copy sheet.

Upon engagement of transporting pawl 38, 42 with the operative control members 43, the movable blanket is shifted two steps corresponding to two lines of the text. The transporting pawl shifts ratchet 27 so that the takeup reel 27 is turned to wind up part of the blanket 26 in the construction of FIG. 2, while at the same time a corresponding part of the blanket is unwound from the leftoff reel 48. As a result, the first two lines of the text section are moved off the periphery of the offset roller, and disappear in the interior of the same. The following lines of the transferred copy on the movable blanket 26 are now in the position to be printed.

In the embodiment of FIG. 4, a shifting of the blanket portion 6th: is accomplished in a similar manner by turning of arm means 67 which draws a part of the movable blanket portion 66a corresponding to the first two lines of the copy of the text thereon, into the interior of the offset roller 69, and off the periphery of the offset roller.

In both embodiments, the immovable blanket portion 25, or etlb remains in the same position so that the head section of the transferred copy can be used during the following revolution for making an imprint of the head section on a copy sheet.

During the continued rotation of the contact arm 90, contact 104 passes over the elongated contact 111 after actuating switches 96 and 97, which, however, are disconnected. The engagement between contact 104 and contact 111 closes the circuit of the electro-magnetic means 78 so that rocking lever 52 is shifted to the right as viewed in FIG. 5, and offset roller 14 or 14 is moved to a position cooperating with the printing form 2 so that the fixed blanket 25 engages the corresponding inked head section of the printing form 2, and receives a fresh transferred copy of the head section.

Assuming that it is intended to print only the third or fifth line during the following printing operation, the keys T3 and T5 are actuated, and the keys T1 and T2 are cleared. Due to the shifting of the movable portion of the blanket, the portion of the movable blanket carrying a copy of the third line will now be located adjacent the immovable portion 25 of the blanket, and the imprint on copy sheet 55 will be made directly adjacent the imprint of the head section. Since the blanket is again shifted after printing of the third line, the portion thereof carrying a copy of line 5 will be positioned in such a way that the imprint of the fifth line will appear directly adjacent the imprint of the third line on the copy sheet 55.

The shifting of the movable blanket portion is again accomplished by control members 43 which are shifted by the corresponding electro-magnetic means and 87 9 to operative positions engaging the transporting pawl 38 during rotation of opposite roller 14, or 14.

If all five keys T1 to T are actuated, all five lines of the text sections will be printed on the copy sheet.

If it is intended to print on each copy sheet successive lines, only one control member 43 is provided and effects shifting of the movable blanket 26 after each revolution so that successive lines of the copy are located adjacent the head section which is printed by the fixed blanket portion-25. After printing of the head section, the first line is printed during the first revolution of the offset roller while the same is moved by electro-magnetic means 78 to the printing position cooperating with the counter pressure roller. The copy sheet 55 may be short since only one line is printed thereon, and consequently, a portion of the counter pressure roller 20 will not be covered by the copy sheet, and will be engaged by the blanket. In order to prevent a transfer from the blanket to the surface of the counter pressure roller, this surface is treated so as not to accept any ink, and is, for example chromium plated. After the printing of the first line of the text section on the copy sheet 55, the blanket 26 is shifted by operation of the control member 33 which engages the transporting pawl 38. Consequently, the second line of the copy of the text on the blanket is now located adjacent the fixed portion of the blanket which carries a copy of the head section. During the following revolution of the offset roller, the head section, and the second line are printed in adjacent positions on the second copy sheet which has been fed in the meantime to the counter pressure roller. The operation is repeated until the five or more lines of the text section are successively printed on consecutive copy sheets adjacent the head portion. By the engagement between contact 104 and contact 111, the copy of the head section on the fixed blanket portion is transferred during each revolution, while it is sutficient to make one transferred copy of the text section on the movable portion of the blanket since during every revolution of the offset roller, only a single line of the copy on the movable blanket portion is used for printing on a single copy sheet.

When offset cylinder 14 i moved to its neutral position by operation of lever 52, and the machine is stopped, the locking pawl 35 is manually shifted out of engagement with the ratchet wheel 32 so that spring 33 turns the same and thereby gears 23 to 31 to effect an operation of the reels 27 and 48 by which the blanket is wound back to its initial position. After starting the machine, the automatic washing device 57 to 59 cleans the blankets 25 and 26. The actuation of the locking pawl 35 to release ratchet wheel 27 may be accomplished by a fixed abutment on the frame of the machine engaged by pawl 35 when the offset roller is moved away from counter pressure roller 20.

After the blanket has been washed, a new printing form may be attached to the main roller 1, and the apparatus is ready for the next operation.

FIG. 7 illustrates a modified construction in which the counter pressure roller is operated by cams. As explained above, offset roller 14 remains in a neutral position spaced from the main roller 1 and from the counter pressure roller 20 when the electro-magnetic means 78 and 81 are tie-energized. A cam shaft 129 is rotated in synchronism with the rollers 1 and 20, and may be driven from gear 19 by a gear train 190, including a gear 191) on shaft 129. A cam 122 for the head portion of the text, and two cams 123 and 123a are mounted on shaft 129 and can be shifted on the same in axial direction so that cams 122, 123 and 123a form a composite cam track for a roller on the lever 125 which is supported for turning movement on the shaft 124. The shaft 21 of cam follower roller 20 is mounted in a slot of lever 125, and also in slots of bearing members so that the counter pressure roller can be moved between a printing position 128 cooperating with the offset roller 14, and an inoperative retracted position shown in solid lines in FIG. 7. A spring 127 urges earn follower lever against the control cams on shaft 129.

When cam 122 engages the cam follower means 125, the printing form 55 on the counter pressure roller 20 is moved into rolling engagement with the blanket portion 26 so that a head portion of the text is printed on the copy sheet. The cam portion corresponding to the head section of the text shifts counter pressure roller 2% to the printing position when the fixed blanket portion 25 passes the printing line between counter pressure roller 20 and offset roller 14 by placing suitable cams 123 and 123a in operative position for engagingcam follower means 25, lines to be printed can be selected. The selected lines are printed adjacent the head section on the printing form, since the movable blanket is shifted as explained with reference to FIGS. 2 and 4 so that after each revolution, the blanket portion having a copy of the respective line is in a position located adjacent the fixed blanket portion 25.

While in the above described embodiment the opposite cylinder 14 is electrically controlled, and the counter pressure roller 20 is mechanically controlled, it is also possible to provide electro-magnetic means for shifting the counter roller to and from its printing position, and to provide rotary cams controlling the position of the offset roller relative to main cylinder 1 and to the counter pressure roller.

The above described embodiments have the disadvantage that the substantial masses of the offset roller and of the counter pressure roller have to be shifted during the operation. In the embodiment illustrated in FIGS. 8 to 11, the counter pressure roller is eliminated, and the mass of the offset roller is reduced.

Referring now to FIGS. 8 to 10, a main roller 202 is mounted on a shaft 2% and is rotated by a motor, not shown. Gears 224i, 221, 222 and 223 connect shaft 267 with shaft 219 of an offset roller 218, the diameter of which is substantially half the diameter of main roller 2%..

Two moistening devices 2677 to 210, and 211 to 213 including rollers and levers for shifting rollers 207 and 211 to a position engaging the surface of main roller 291. are provided. An inking device 214 to 217 permits the movement of roller 214 to a position for inking a printing form 202 which is secured by a holder means 2&3 to the periphery of main roller 291. Another holder means 204 holds a copy sheet 2% on the periphery of main roller 201. A feeding member 271 is provided for feeding single copy sheets 205 from a stack of copy sheets to the holder means 224 in an automatic operation which is not an object of the present invention.

After a complete revolution of the main roller 201, the holder means 264 may be opened in a conventional manner to permit discharge of a printed copy sheet into a receiving pocket.

As best seen in FIG. 9, offset roller 218 is constructed similar to the offset roller described with reference to FIG. 2. A fixed blanket 224 is held by clamps on the corresponding peripheral surface portion of the offset roller 218, and cooperates with the printing form 202 on the main cylinder to receive a transferred copy of the head section of the text of the printing form. A movable blanket 225 is provided for receiving transferred copies of parts or lines of the text section of the printing form. Movable blanket 225 can be wound upon a reel or shaft 226, and is wound off a reel or shaft 247. The blanket 225 is guided over rollers 245 and 246 from the interior of the hollow offset roller 218 to the peripheral surface of the offset roller. Gears 227, 230 and 229 are driven by a gear 228 which is fixed to a shaft 233 carrying a ratchet wheel 231 under the action of a spring 232, and sprocket means 243 engaging perforations in the inner portion of blanket 225 and cooperating with another transporting roller 244. A locking pawl 234 holds ratchet wheel 231 against the action of spring 232 and is loaded by spring 236. A transporting pawl 237 is spring loaded by spring 239 to abut a stop 249. Roller 241 of transporting pawl 237 successively engages actuating members 242 when the same are in the illustrated operative position, and is shifted by the same to turn to a position in which the ratchet wheel 231 is turned one step, and effects corresponding shifting of the movable blanket 225 through one step. Shafts 2d and 47 are correspondingly turned through the gear train 228 to 230. Locking pawl 234 engages ratchet wheel 231 after each step and holds the same against the action of spring 232. However, if locking pawl 234 is held in a position releasing the ratchet wheel, spring 232 will be effective to rotate the parts connectcd thereto so that the blanket 225 is again fully wound up on reel 47. The engagement between roller 241 and control members 242 takes place only when the offset roller is in a neutral position spaced from the main roller 291.

A gear train 220, 254, 255 connects main roller 2G1 and its shaft 2 6 with a shaft 258 on which a contact arm is mounted. As best seen in FIG. 11, contact arm has a contact 256a which successively passes over contacts 272, 274, 2'75, 279, similar contacts, not shown, and contact 23%. A contact 25% on contact arm 256 slides on the slide ring 273 which is connected to a contact 2 4 of the relay 262 which also operates a contact 263. Contact arm 256 also operates the switch 261 in the circuit of relay The manually operated main switch 266 is connected in series with switch 261 and is also connected to a voltage source. Switch 254 is connected to an amplifier 265 and to a plurality of electro-magnetic means 252, which, as best seen in FIG. 8 are mounted on a fixed frame portion 253, and operate through armatures 251 and a joint 25% a supporting lever means 248 on which shaft 219 of offset roller 218 is mounted. Supporting lever means 248 turns about a shaft 249 in the frame of the machine, and is biased by spring 267 to abut an adjustable stop 2% unless an energized electromagnetic means 252 actuates supporting lever means 243 to move offset roller 218 toward main roller 201.

When offset roller 21% is retracted from main roller 2% the blanket thereon can be washed by washing device 231 to 284 when the same is shifted to an operative washing position.

Referring again to FIG. 11, the contacts 274, 275, 279 are respectively associated with lines or parts of the text section of the printing form, are connected to keys T1 to T3 which are manually operated for selecting parts or lines of the text section of the printing form. Each key operates two switches 276a and 2761), 277a and 277b, and 278a and 27822. Switches 276a to 278a are respectively connected to electro-magnetic means 276, 277 and 278 which operate, respectively, the control members 24-2 to shift the same to an operative position located in the path of movement of roller 241 when the respective electro-magnetic means 276 to 278 is energized.

The manually operated switches 276a to 278a are also connected to a switch 266 which is operated by the rotary arm 25d and to a main switch 285.

It is evident that the number of manually operated keys corresponds to the number of lines or parts of the text section of the printing form, and other corresponding number of control members 242 is provided.

The printing machine illustrated in FIGS. 8 to 11 is operated in the following manner: At the beginning of a printing operation, the movable blanket 225 is fully wound on a reel or shaft 24-7, and main roller 1 and offset roller 18 are spaced from each other while rotating synchronized in such a manner that the peripheral speeds of the offset roller and of the main roller are the same.

Assuming that it is intended to print the first two lines of the text section of the printing form in addition to the head section, the keys T1 and T2 are actuated so that the corresponding switches 276a, 276b, 277a and 2'77b close.

The main printing switch 269 is actuated and closed until contact arm 256 actuates and closes switch 261 so that relay 262 is energized and opens switch 264 while closing the holding contact 263 to hold itself. The closed switch 264 closes the circuit of the electro-magnetic operating means 252 which receive a voltage from a voltage source through amplifiers 265.

The armatures 251 of electro-magnetic operating means 252 are attracted and turn through the supporting lever means 243 the offset roller 213 to a transfer position in which a copy of the head section is transferred from the printing form 2M; to the fixed blanket 224, and a complete copy of the entire text section of the printing form 262 is transferred to the shiftable blanket 225.

Thereupon, arm 56 engages and operates switch 266 so that relay 62 is de-energized since the holding circuit through holding contact 263 is interrupted. At the same time, electro-magnetic means 252 are de-energized since relay contact 264 opens. Spring means 267 become effective to pull the supporting lever means 248 against stop 263 so that the offset roller is moved to a retracted position in which the blankets are spaced from the surface of the main roller 201.

The machine is now set in a conventional manner to the printing operation, and a copy sheet is fed by a feeding member 271 to the holding means 2%. The member 271 of the feeding means operates two switches 279a and 270b, as best seen in FIG. 11, which are respectively connected to the manually operated switches and to the electro-magnetic means 276 to 278. Switch 279a is also connected to the electro-magnetic means 252.

When contact arm 256 engages with its contact 256a the long slide contact 272, the circuit is closed through contact 256b and slide ring 273, and electro-magnet means 252 are energized and move the offset roller 218 toward the main cylinder 1 which has turned to the position in which the first portion of the copy sheet is located opposite the fixed blanket 224 so that an imprint of the head section is made on the copy sheet by the transferred copy on the fixed blanket 224.

During the continued turning movement of arm 256, contact 256a successively engages contacts 274, 275 and 279, and all other contacts, not shown which are associated with lines of the text section. Since keys T1 and T2 were previously operated, the corresponding selector switches are closed, and electro-magnetic means 276 and 277 are energized through switches 276a and 277a, while electro-magnetic means 252 are twice energized through switches 27612 and 277]) when contact 256a engages contacts 274 and 275. Electro-magnetic means 252 cause movement of the offset roller to a printing position in which the first two lines of the copy of the text section on blanket 225 are transferred to the copy sheet adjacent the imprint of the head section. The energized electro-magnetic means 276 and 277 move the control members 242 to the operative position in which they are engaged by transporting pawl means 237 and 241 to shift the movable blanket 225 two steps so that the first two lines of the copy on the movable blanket are pulled into the interior of the offset roller, while the third line is located on the periphery of the offset roller adjacent the fixed blanket 224.

The surface of the main cylinder 1 is treated, for example chromium plated, so that the exposed surface of the main cylinder, which is not covered by copy sheet, does not receive an imprint from the unused lines of the copy on the blanket 225.

During the further turning movement of contact arm 256, contact 256a engages stationary contact 279, which has no effect since the selector switch T3 was not operated.

Finally, contact 256a engages contact 230, and eifects energizing of electro-magnetic means 252 and movement of the offset cylinder to the transfer position in which the fixed blanket again engages the printing form in l? the region of the head section so that a fresh copy is transferred to the fixed blanket 224. The switches 261 and 265 do not have an effect when engaged by the contact arm, since the circuits thereof are interrupted by switch 260 and contact 263.

In the meantime, the automatic feeding member 271 has fed another copy sheet 205 to the holder means 2% of the main roller 1, and the head section is printed on the new copy sheet when contact arm 256 passes the contact 272. During the further rotation of contact arm 256, the following third and fourth lines of the text sections are printed on the new copy sheet, since selector keys T1 and T2 remain in the position in which the selector switches 276a, 276b, 277a and 2771) are closed. Since the third and fourth lines of the transferred copy of the text section are now located adjacent the fixed blanket 226 on the peripheral surface of the offset roller, that is in the same place in which during the proceeding revolution the first two lines of the transferred copy were located, the third and the fourth line are now printed on the new copy sheet adjacent the imprint of the head section. Of course, if only a single key 274 would have been operated, successive single lines of the transferred copy of the text section on blanket 225 would be printed on successive copy sheet adjacent the head section.

The operation can be repeated until all lines of the text section of printing form 202, which were transferred as a mirror stripped copy to the movable blanket 225', are printed on successive copy sheets 205. It is also possible to actuate keys T1 and T3, for example, so that spaced lines are printed.

If it is desired to obtain the complete copy of the entire text, all keys of the key board 259 are cleared, the switch 285 is closed, and the feeding of copy sheets is started by member 271 so that the electromagnetic operating means 252 are energized. This permits the transfer of the entire text including head section and text section from the printing form 292 to the blankets 224 and 225, and a following printing from both blankets onto a single copy sheet 265. After the printing operation, the offset roller 218 is again retracted from the main roller 201, and by suitable mechanical device, the locking pawl 234 is operated to be withdrawn from the ratchet 231 so that the spring 232 turns the shaft 226 and 247 to Wind up the movable blanket 225 to its initial position. At the same time, the automatic washing device 231 to 23 3- is rendered operative, and cleans the blankets 224 and 225.

A new printing form 2&2 may now be attached to the main roller 201, and the machine is ready for the next printing operation.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of said printing machines differing from the types described above.

While the invention has been illustrated and described as embodied in an offset printing machine having an offset roller with a movable blanket permitting the printing of selected lines of the text adjacent the head section of the text, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. In an offset printing machine, in combination, first roller means having peripheral surface means, and first and second holder means for holding a printing form, and a copy sheet, respectively, on separate portions of said surface means; second roller means including an olfset roller, blanket means having a peripheral portion located on the peripheral surface of said offset roller, and transporting means for transporting said blanket means so that said peripheral portion is shifted; supporting means supporting said second roller means for translatory movement between a transfer position in which said first and second roller means cooperate for transferring a copy of said printing form to said peripheral portion of said blanket means, a printing position in which said first and second roller means cooperate for printing by said peripheral portion of said blanket means at least a part of said transferred copy on a copy sheet held by said second holding means, and a neutral position in which said first and second roller means are spaced from each other;

operating means for moving said second roller means between said positions; and control means for operating said transporting means after each revolution of said offset roller so that said blanket means is shifted and different parts of said transferred copy are printed on successive copy sheets.

2. In an offset printing machine, in combination, first roller means having peripheral surface means, and first and second holder means for holding a printing form, and a copy sheet, respectively, on separate portions of said surface means; second roller means including a hollow offset roller, blanket means having a peripheral portion located on the peripheral surface of said offset roller and an inner portion located in the interior of said olfset roller, a take-up reel in the interior of said offset roller for winding up said inner portion of said blanket means and transporting means for driving said take-up reel and for transporting said blanket means into and out of the interior of said ofiset roller so that said peripheral portion is shifted; supporting means supporting said roller means for translatory movement between a transfer position in which said first and second roller means cooperate for transferring a copy of said printing form to said peripheral portion of said blanket means, a printing position in which said first and second roller means cooperate for printing by said peripheral portion of said blanket means at least a part of said transferred copy on a copy sheet held by said second holding means, and a neutral position in which said first and second roller means are spaced from each other; operating means for moving said roller means between said positions; and control means for operating said transporting means after each revolution of said offset roller so that said blanket means is shifted and wound up and different parts of said transferred copy are printed on successive copy sheets.

3. In an offset printing machine, in combination, first roller means having peripheral surface means, first holder means for holding a printing form on said surface means, and second holder means for holding a copy sheet on said surface means; second roller means including an offset roller, blanket means having a peripheral portion located on the peripheral surface of said offset roller, and transporting means for transporting said blanket means so that said peripheral portion is shifted different amounts; supporting means supporting said roller means for translatory movement between a transfer position in which said first and second roller means cooperate for transferrin a copy of said printing form to said peripheral portion of said blanket means, a printing position in which said first and second roller means cooperate for printing by said peripheral portion of said blanket means at least a part of said transferred copy on a copy sheet, and a neutral position in which said first and second roller means are spaced from each other; operating means for moving said roller means between said positions; and control means for operating said transporting means after each revolution of said ofiset roller and including a plurality of selector members respectively correlated with different parts of said printing form so that said blanket means is shifted and different selected parts of said transferred copy are printed during successive revolutions of said second roller means on successive copy sheets spaced the same distance from said second holder means if different selector members are actuated between successive revolutions, said control means including means controlled by said selector members and connected to said transporting means to actuate the same to transport said blanket means selected different amounts.

4. In an offset printing machine, in combination, first roller means having peripheral surface means, and first and second holder means for holding a printing form havin g a head section and a text section, and a copy sheet, respectively, on separate portions of said surface means; second roller means including an offset roller, blanket means having a first peripheral portion fixedly secured to said offset roller and a second peripheral portion slidable on the peripheral surface of said oifsetroller, and transporting means for transporting said second peripheral portion so that said second peripheral portion is shifted different amounts; supporting means supporting said second roller means for translatory movement between a transfer position in which said first and second roller means cooperate for transferring a copy of said head section of said printing form to said first peripheral portion and for transferring a copy of said text section of said printing form to said second peripheral portion of said blanket means, a printing position in which said first and second roller means cooperate for printing by said first peripheral portion said head section and for printing by said second peripheral portion at least a part or line of said transferred copy of said text section on a copy sheet held by said second holding means, and a neutral position in which said first and second roller means are spaced from each other; operating means for moving said roller means between said second positions; and control means for operating said transporting means after each revolution of said offset roller and including a plurality of selector members respectively correlated with different parts of said printing form so that said blanket means is shifted and different selected partsof said text section of said transferred copy are printed during successive revolutions of said second roller means on successive copy sheets and adjacent said head section if different selector members are actuated between successive revolutions, said control means including means controlled by said selector members and connected to said transporting means to actuate the same to transport said blanket means selected different amounts.

5. In an offset printing machine, in combination, first roller means having peripheral surface means, and first and second holder means for holding a printing form, and a copy sheet, respectively, on separate portions of said surface means; second roller means including an offset roller, blanket means having a peripheral portion located on the peripheral surface of said offset roller and an inner portion located in the interior of said offset roller, a take-up reel in the interior of said offset roller for winding up said inner portion of said blanket means and transporting means for driving said take-up reel and for transporting said blanket means so that said peripheral portion is shifted different, amounts, said transporting means including a stepping mechanism and an actuating member for said stepping mechanism; supporting means supporting said second roller means for translatory movement between a transfer position in which said first and second roller means cooperate for transferring a copy of said printing form to said peripheral portion of said blanket means, a printing position in which said first and second roller means cooperate for printing by said peripheral portion of said blanket means at least a part of said transferred copy on a copy sheet held by said second holding means, and a neutral position in which said first and second roller means are spaced from each other; operating means for moving said second roller means between said positions; and control means including a plurality of control members individually movable to and from an operative position for operating said actuating member of said transporting means after each revolution of said offset roller so that said blanket means is shifted and wound up and different parts of said transferred copy are printed on successive copy sheets, and selector means connected with said control members for selectively moving the same to said operative position whereby said transporting means transport said blanket means different amounts.

6. In an offset printing meachine, in combination, first roller means having peripheral surface means, and first and second holder means for holding a printing form, and a copy sheet, respectively, on separate portions of said surface means; second roller means including an offset roller, blanket means having a peripheral portion located on the peripheral surface of said offset roller and an inner portion located in the interior of said offset roller, a take-up reel in the interior of said offset roller for winding up said inner portion of said blanket means and transporting means for driving said take-up reel and for transporting said blanket means so that said peripheral portion is shifted, said transporting means including a spring loaded stepping mechanism and an actuating memher for said stepping mechanism; supporting means supporting said second roller means for translatory movement between a transfer position in which said first and second roller means cooperate for transferring a copy of said printing form to said peripheral portion of said blanket means, a printing position in which said first and second roller means cooperate for printing by said peripheral portion of said blanket means at least a part of said transferred copy on a copy sheet held by said second holding means, and a neutral position in which said first and second roller means are spaced from each other; operating means for moving said second roller means between said positions; and control means including at least one control member for operating said actuating member of said transporting means after each revolution of said offset roller so that said blanket means is shifted and wound up and different parts of said transferred copy are printed on successive copy sheets, and means for releasing said spring loaded stepping mechanism so that said blanket means is moved to its initial position before another printing form is used.

7. In an offset printing machine, in combination, first roller means having peripheral surface means, and first and second holder means for holding a printing form, and a copy sheet, respectively, on separate portions of said surface means; second roller means including an offset roller, blanket means having a peripheral portion located on the peripheral surface of said offset roller, and transporting means for transporting said blanket means so that said peripheral portion is shifted different amounts, said transporting means including means for winding up said blanket means including a stepping mechanism having an actuating pawl; supporting means supporting said roller means for translatory movement between a transfer position in which said first and second roller means cooperate for transferring a copy of said printing form to said peripheral portion of said blanket means, a printing position in which said first and second roller means cooperate for printing by said peripheral portion of said blanket means at least a part of said transferred copy on a copy sheet held by said second holding means, and a neutral position in which said first and second roller means are spaced from each other; operating means for moving said roller means between said positions; and control means including a plurality of control members spaced about the periphery of said offset roller for operating said actuating member of said transporting means after each revolution of said offset roller and including a plurality of selector members respectively correlated with different parts of said printing form and with said control members so that said blanket means is shifted and different selected parts of said transferred copy are printed during successive revolutions of said second roller means on successive copy sheets if different selector members are actuated between successive revolutions, each of said control members having an inoperative position and an operative position projecting into the path of movement of said actuating member for operating the same during rotation of said offset roller, said control means controlled by said selector members including shifting means for shifting each control member independently of the other control member between said positions.

8. An offset printing machine as set forth in claim 7 wherein said selector members include manually operated switches respectively correlated with lines of the text section of the printing form, and keys; and wherein said shifting means include electromagnetic means having a circuit connected to said switches. I

9. An offset printing machine as set forth in claim 8 and including a stationary contact member having a plurality of contact buttons connected with said switches, respectively, and a rotary contact arm connected to said main roller for synchronous rotation and having contact means successively engaging said contact buttons; wherein said operating means include electromagnetic operating means, and wherein said contact means are connected into the circuit of said electromagnetic operating means for energizing the same when said contact means engage a contact button whose associated selector switch is actuated by the, respective selector key.

10. An offset printing machine as set forth in claim 9, and including feeding means for feeding a copy sheet to said first roller means and including a feeding member movable to an operative position when feeding a copy sheet; and switch means cont olled by said feeding member in said operative position, and being connected to said selector switches and to said electromagnetic operating means so that said electromagnetic operating means are operable only after feeding of a copy sheet to said first roller means.

ll. In an offset printing machine, in combination, first roller means having peripheral surface means, first holder means for holding a printing form having ahead section and a text section on said surface means, and second holder means for holding a copy sheet on said surface means; second roller means including an offset roller, blanket means having a first peripheral portion fixedly secured to said offset roller and a second peripheral portion slidable on the peripheral surface of said offset roller, and transporting means for transporting said second peripheral portion so that said second peripheral portion is shifted different amounts, said transporting means including a stepping mechanism and an actuating member for said stepping mechanism; supporting means supporting said second roller means for translatory movement between a transfer position in which said first and second roller means cooperate for transferring a copy of said head section of said printing form to said first peripheral portion and for transferring a copy of said text section of said printing form to said second peripheral portion of said blanket means, a printing position in which said first and second roller means cooperate for printing by said first peripheral portion said head section and for printing by said second peripheral portion at least a part or line of said transferred copy of said text section on a copy sheet, and a neutral position in which said first and second roller means are spaced from each other; operating means for moving said second roller means between said positions; and control means including a plurality of control members, and a plurality of manually operable selector members respectively correlated with different parts of said text section and operatively connected with said control members respectively, to actuate the same for operating said actuating member of said transporting means after each revolution of said offset roller so that said blanket means is shifted and different sel cted parts of said transferred copy are printed during successive revolutions of said second roller means on successive copy sheets spaced the same distance from said second holder means if different selector members are actuated between successive revolutions.

12. An offset printing machine as set forth in claim 11 wherein said offset roller is hollow, and wherein said blanket means has an inner portion located in the interior of said offset roller, and including wind-up means for winding up said blanket means located in the interior of said offset rol er and driven by said stepping mechanism.

13. An offset printing machine as set forth in claim 12 wherein said blanket means has perforations, wherein said wind-up means include a take-up reel and a let-off reel, and sprocket means for engaging said perforations and driven by said stepping mechanism.

14. An offset printing machine as set forth in claim 12 wherein said blanket means has one end secured to the peripheral surface of said offset roller and another end located in the interior of said offset roller secured to said wind-up means; and including an arm turnable in the interior of said offset roller and having a roll engaging said inner portion of said blanket means and forming a loop 7 in the same, said arm being driven from said stepping mechanism to shift said second peripheral portion of said blanket means, said first peripheral portion being located adjacent said secured end; and guide rollers in said offset roller for guiding said blanket means into and out of said offset roller.

15. In an offset printing machine, in combination, first roller means including a main roller having a peripheral surface, first holder means on said main roller for holding a printing form on the peripheral surface of said main roller, a counter pressure roller, and a second holder means for holding a copy sheet on the peripheral surface of said counter pressure roller; second roller means including an offset roller, blanket means having a peripheral portion located on the peripheral surface of said offset roller, and transporting means for transporting said blanket means so that said peripheral portion is shifted different amounts; supporting means supporting said second roller means for translatory movement between a transfer position in which said main roller and said offset roller cooperate for transferring a copy of said printing form to said peripheral portion of said blanket means, a printing position in which said offset roller and said counter pressure roller cooperate for printing by said peripheral portion of said blanket means at least a part of said transferred copy on a copy sheet, and a neutral position in which said first and second roller means are spaced from each other; operating means for moving said second roller means between said positions; and control means for operating said transporting means after each revolution of said offset roller and including a plurality of selector members respectively correlated with different parts of said printing form so that said blanket means is shifted and different selector parts of said transferred copy are printed during successive revolutions of said second roller means on successive copy sheets if different selector members are actuated between successive revolutions, said control means including means controlled by said selector members and connected to said transporting means to actuate the same to transport said blanket means selected different amounts. I

16. In an offset printing machine, in combination, first roller means including a main roller having a peripheral surface, first holder means on said main roller for holding a printing form on one part of the peripheral surface of said main roller, and a second holder means for holding a copy sheet on another part of the peripheral surface of said main roller; second roller means includ-

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5727749 *Feb 5, 1996Mar 17, 1998Presstek, IncAutomatic plate-loading cylinder with constant circumferential tension
US6026747 *Jan 19, 1999Feb 22, 2000Presstek, Inc.Automatic plate-loading cylinder for multiple printing members
US6308629 *May 9, 1996Oct 30, 2001Duco International LimitedManipulation of printing blankets
USRE36552 *Jul 15, 1998Feb 8, 2000John H. Harland CompanyApparatus and method for printing multiple account lines
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Classifications
U.S. Classification101/142, 101/91
International ClassificationB41L39/00
Cooperative ClassificationB41L39/00
European ClassificationB41L39/00