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Publication numberUS3702586 A
Publication typeGrant
Publication dateNov 14, 1972
Filing dateSep 8, 1970
Priority dateSep 13, 1969
Also published asCA938159A, CA938159A1, DE2045149A1, DE2045149B2, DE2045149C3
Publication numberUS 3702586 A, US 3702586A, US-A-3702586, US3702586 A, US3702586A
InventorsTamaki Kaneko, Katsumi Mizuno
Original AssigneeRicoh Kk
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Device for switching between automatic and non-automatic master plate feeding and removing operations for offset printing machines
US 3702586 A
Abstract
A device for switching between automatic and non-automatic master plate feeding and discharging operations, such device being adapted for use with offset printing machines of the type in which an actuation member is operated in steps for causing the printing machines to perform a series of operations required for duplicating a master process. These operations include a master plate feeding operation for feeding a master plate to a master cylinder, an etching operation for applying an ink repellent etching solution to the master plate mounted on the master cylinder, an inking operation for applying ink to the master plate, a copy sheet feeding operation for feeding one copy sheet after another between blanket and impression cylinders, a master plate removal operation for removing the master plate from the master cylinder after completion of duplication, and a blanket cylinder cleaning operation. The device comprises an automatic, non-automatic switching actuation member capable of moving relative to said actuation member. If the actuation member is operated after the switching actuation member is operated, then the master plate feeding and removing operations can be performed automatically.
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United States Patent Kaneko et al.

451 Nov. 14,1972

DEVICE FOR SWITCHING BETWEEN [72] Inventors: Tamaki Kaneko; Katsumi Mizuno,

both of Tokyo, Japan [73] Assignee: Ricoh Co., Ltd., Tokyo, Japan [22] Filed: Sept. 8, 1970 [21] Appl. No.: 70,003

[30] Foreign Application Priority Data Sept. 13, 1969 Japan ..44/72886 [52] US. Cl. ..10l/142,101/148, 101/425 [51} Int. Cl. ..B4li 7/06, B4lf 7/26 [58] Field of Search ..101/136-145, 148, 101/425; 74/548, 491; 192/995, 95; 200/17, 18, 172 R [56] References Cited UNITED STATES PATENTS 3,496,864 2/1970 Tonkin et al. ..101/142 3,595,351 7/1971 lshida ..74/548 3,577,916 5/1971 Tonkin ..101/148 3,412,676 11/1968 Tonkin ..l0l/l44 3,601,045 8/1971 Sehinke 101/148 3,431,841 3/1969 Tonkin et al. ..101/148 3,056,346 10/1962 Gammeter et al ..10l/l44 3,457,857 7/1969 Burger ..101/144 3,490,367 l/l970 Kaneko et al ..l0l/l44 Primary Examiner.l. Reed Fisher Attorneyl-Ienry T. Burke, John F. Ohlandt, Jr., Robert S. Dunham, P. E. Henninger, Lester W. Clark, Gerald W. Griffin, Howard J. Churchill, R. Bradlee Boal, Christopher C. Dunharn, Robert Scobey and Thomas F. Moran ABSTRACT A device for switching between automatic and non-automatic master plate feeding and discharging operations, such device being adapted for use with offset printing machines of the type in which an actuation member is operated in steps for causing the printing machines to perform a series of operations required for duplicating a master process. These operations include a master plate feeding operation for feeding a master plate to a master cylinder, an etching operation for applying an ink repellent etching solution to the master plate mounted on the master cylinder, an inking operation for applying ink to the master plate, a copy sheet feeding operation for feeding one copy sheet after another between blanket and impression cylinders, a master plate removal operation for removing the master plate from the master cylinder after completion of duplication, and a blanket cylinder cleaning operation. The device comprises an automatic, non-automatic switching actuation member capable of moving relative to said actuation member. If the actuation member is operated after the switching actuation member is operated, then the master plate feeding and removing operations can be perfflrmcd i mat sa i- 7 Claims, 12 Drawing Figures PNENTED IHV IWZ 3.702.586

SHEET 1 0F 4 FIG. 46 41 4!1 4 INVENTORS TAMA K/ KAA/FKO KATSUM/ M/ZUNO MM, Ea,

ATTORA/EV PATENTEflunv 14 1912 SHEET 2 BF 4 FIG. 3

FIG. 2

INVENTORS A MA K/ KANE/ 0 BY KA75l/M/ M/ZU/VO PATENTED 14 I9 3.702.586

saw u BF 4 INVENTORS TAMAK/ KANE/ 0 BY K4750M/ M/ZU/VO ATTO/WVEY DEVICE FOR SVITCHING BETWEEN AUTOMATIC AND NON-AUTOMATIC MASTER PLATE FEEDING AND REMOVING OPERATIONS FOR OFFSET PRINTING MACHINES BACKGROUND OF THE INVENTION A rotary offset printing machine comprises, as shown in FIG. I, a master cylinder 1, blanket cylinder 2 and impression cylinder 3. In operation, a master plate is w mounted on the master cylinder 1 and an ink repellent etching solution and ink are applied successively to the master cylinder. Then, the cylinders are rotated to form an inked image of the master plate on the blanket cylinder 2 which image is transferred to a copy sheet fed between the impression cylinder 2 and blanket cylinder 3. A series of printing operations broadly consist of a master plate feeding operation, etching opera tion, inking operation, copy sheet feeding operation, master plate removal operation, and blanket cylinder cleaning operation. In the printing machine of the type shown in FIG. 1, an actuation member 4 for switching between various operations disposed in a neutral position is successively moved into positions 4A, 4B, 4C, and 40 shown in dot-and-dash lines, so that the master plate feeding and etching operations are automatically performed in the 4A position, the inking operation is automatically performed in the 48 position, the copy sheet feeding operation is automatically performed in the 4C position and master plate removal and blanket cylinder cleaning operations are automatically performed in the 4D position. The construction and operation of the actuating member 4 will be subsequently described in detail.

There is no obstacle to be surmounted in automating the inking and copy sheet feeding operations. However, fully automating the master plate feeding, etching and master plate removal operations involves problems to be obviated, because in some cases it must be left to the discretion and judgement of the operator whether these operations are to be performed automatically or nonautomatically. For example, when the master plate is made of an aluminum sheet, the master plate feeding, etching and master plate removal operations are preferably performed manually. Besides, if it is not possible to switch between automatic and non-automatic operations when the actuation member 4 is returned from the 4B position, or inking operation position, to the 4A position, or master plate feeding position, after completion of duplication, the next succeeding master plate will be fed while the master plate just duplicated is still mounted on the master cylinder, thereby causing trouble.

The present invention proposes to obviate the aforementioned disadvantage of the prior art by providing a device for switching between automatic and non-automatic master plate feeding and removal operations for rotary offset printing machines which permits, when a cycle of printing operations as aforementioned are automatically performed by moving the actuation member 4, the master plate feeding, etching and master plate removal operations to be switched between automatic and non-automatic operations as desired by actuating a switching actuation member provided in the actuation member.

Additional objects as well as features and advantages of the invention will become evident from the description set forth hereinafter when considered in conjunc tion with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a side view of a rotary offset printing machine incorporating the present invention;

FIG. 2 is a sectional view taken along the line II-II of FIG. 1;

FIG. 3 is a fragmentary view of FIG. 2, showing the switching actuation member in its lower position in which it is disposed within the actuation member;

FIG. 4 is a perspective view of the mechanism shown in FIG. 2;

FIG. 5 is a side view of another embodiment of the switching actuation member used in the device according to this invention;

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5;

FIGS. 7 to 9 are sectional views taken along the line VII-VII of FIG. 2, showing the actuation member in different positions;

FIG. 10 is a front view of one embodiment of the automatic master plate removal command cam;

FIG. 1 I is a front view of one embodiment of the automatic master plate feeding command cam; and

FIG. 12 is a side view of the automatic etching unit and automatic master plate feeding unit attached to a printing machine incorporating the present invention.

DESCRIPTION OF A PREFERRED EMBODIMENT In FIG. 1, the master cylinder 1, blanket cylinder 2 and impression cylinder 3 are each supported by a shaft attached to opposite side plates 5 of the machine for rotation in unison. The actuation member 4 for switching between operations is tubular in shape, as shown in FIG. 2, and has a base secured to a bevelled surface 6a formed in the forward end of a tubular shaft 6 which is rotatably mounted in a minor diameter por tion 7a of a spindle 7 secured to one of the side plates 5. Secured to the base of the tubular shaft 6 is a click plate 8 having a corrugated edge 8a formed with waveshaped elevated portions and depressed portions (see FIG. I and FIG. 4). A pin 12 attached to a lever 11 urged by a spring 9 (FIG. 1) to move in pivotal motion about a shaft 10 in an anticlockwise direction is received in and presses against one of the depressed portions in the corrugated edge 80. The corrugated edge cooperates with the pin 12 to click stop the actuation member 4 in position when it is moved from its neutral position to its positions 4A, 4B, 4C, and 4D in FIG. I.

A support member 13 is fitted over the upper surface of the tubular shaft 6 (See FIG. 4), and a U-shaped supporting member 14 is attached to the upper surface of the supporting member 13. Pivotally supported by a shaft 16 attached to the U-shaped supporting member 14 is an automatic/non-automatic switching member 15 (See FIG. 2) which is formed at one end with a fork 15a engaging the base of the actuation member 4. Mounted at the base of the actuation member 4 is a spring 17 which urges the fork 15a of the switching member 15 to move upwardly. Thus, the switching member 15 is urged to move in pivotal motion in a clockwise direction about the shaft 16 in FIG. 2.

Mounted in the actuation member 4 is an automatic/nomautomatic switching actuation member 18 having a head 18a projecting upwardly above the upper end of the actuation member 4. Attached to the lower end of the switching actuation member 18 is a radially directed pin 19 which is loosely received in a slot 4a formed in the actuation member 4 near its base. The upper surface of the fork 15a of the switching member 15 which is urged to move in the clockwise direction about the shaft 16 as aforementioned presses against the radial pin 19. Thus, the pin 19 presses against the upper edge of the slot 4a. With the pin 19 in this position, the head 18a of the switching actuation member 18 projects slightly upwardly above the upper end of the actuation member 4. Loosely fitted over the major diameter portion of the spindle 7, as shown in FIG. 2, is a short cylinder 20 which pivotally mounts an automatic master plate removal command cam 21 (FIG. 10) and an automatic master plate feed command cam 22 (FIG. 11). The switching member 15 has an arm 15b whose forward end is received, through a radially disposed slot 8b (FIG. 4) formed in the click plate 8, in cam slots 21a and 22a formed in the cams 21 and 22 respectively.

When the switching actuation member 18 is in its upper position or out of the actuation member 4, as shown in FIG. 4, the forward end of the arm 15b is maintained in contact with an arcuate edge 21a, and 22a, (FIGS. 10 and 11) of the cams 21a and 22a respectively (See FIG. 7, 10 and 11). The earns 21 and 22 have arms 21b and 22b respectively, with the cam 21 being urged to move in an anticlockwise direction by a spring 23 mounted on its arm 21b and the cam 22 being urged to move in a clockwise direction by a spring (not shown) mounted on its arm 22b. The arms 21b and 22b abut against a stopper 24 attached to the side wall so as to limit the movements of the earns 21 and 22 and keep them in their neutral positions shown in FIG. 1 and FIG. 7.

If the switching actuation member 18 in its upper position shown in FIG. 2 is moved to its lower position, then the pin 19 moves downwardly in the slot 4a to cause the switching member 15 to move in an anticlockwise direction about the shaft 16 in FIG. 3 against the biasing force of the spring 17. This causes the arm 15b of the switching member 15 to move from a dot-and-dash line position l5bA to a solid line position shown in FIG. 3 in which it is brought into engagement with mountain-shaped edges 21a, and 22a, (FIGS. and 11) of the cams 21 and 22 respectively.

If now the actuation member 4 is moved from its neutral position to its dot-and-dash line position 4A in FIG. 1 while the switching actuation member 18 is in its lower position, then the switching member also moves in the same direction. At this time, the arm 15b of the member 15 is brought into pressing engagement with an end of the mountain-shaped edge 2202 of the automatic master plate feed command cam 22 and causes the cam 22 to move in the same direction (See FIG. 8). The cams 21 and 22 are shaped such that the mountain-shaped edge 2102 of the cam 21 is slightly deviated from the mountain-shaped edge 2202 of the cam 22 so that the cam 21 may not interfere with the movement of the cam 22.

As will be seen by reference to FIG. 7, an arm 25 is pivotally supported by a shaft 26 attached to one of the side plates (the plane of the figure is considered to be the side plate) of the machine. The arm 25 is urged by a spring (not shown) to move in an anti-clockwise direction about the shaft 26. Mounted on a shaft attached to the arm 25 is a roller 27 which presses against the elevated portion of a wave-shaped cam edge 220 formed on the outer periphery of the cam 22 (FIG. 11). If the cam 22 moves as aforesaid as a result of the movement of the actuation member 4 to its position 4A, then the roller 27 is free to move into engagement with the depressed position of the wave-shaped cam edge 22c; consequently the arm 25 moves in pivotal motion in an anticlockwise direction about the shaft 26 (FIG. 8). In FIG. 7, a pin 28 is secured to the free end of the arm 25, which pin 28 is received in an opening 50 formed in the side plate 5. As the arm 25 is moved in the anticlockwise direction as aforesaid, the pin 28 moves in the opening 5a from its position shown in FIG. 7 to its position shown in FIG. 8 and moves members connected to the master plate feed unit and etching unit as subsequently to be described, thereby commanding these units to start operation.

In the alternative situation from that just described, i.e., if the actuation member is moved from its neutral position to its dot-and-dash line position 4A in FIG. I while the switching actuation member 18 is in its upper position, the switching member 15 will only slide along the arcuate edges 21a, and 22a of the cams 21 and 22, so that neither the cam 21 nor the cam 22 are moved, thereby permitting the operator to perform manually the master plate feeding and etching operations. If the actuation member 4 is moved from its position 4A to its position 48 in FIG. 1, the arm 15b of the switching member 15 will change its position by moving in sliding motion along the arcuate edges 210 and 22a of the cams 21 and 22 respectively. If the switching actuation member 18 is moved to its lower position while the actuation member 4 is in its position 4A in FIG. 1, the arm 15b of the member 15 will be maintained in engagement with the mountain-shaped edges 210 and 22a, of the cams 21 and 22 respectively FIG. .8 shows the arm 15b of the member 15 which is maintained in engagement with the mountain-shaped edges 21a, and 22a, of the cams 21 and 22 respectively. Since the arm 21b of the cam 21 abuts against the stopper 24, the arm 15b will move downwardly along the mountain-shaped edges 21a, and 22a, of the cams 21 and 22 respectively as the actuation member 4 is moved from its position 4A to its position 48. Thus, the switching actuation member 18 is restored to its original position. That is, when the actuation member 4 is moved from its position 4A to its position 48, there is no choice to select either an automatic operation or a nonautomatic operation. An automatic inking operation is started without fail when the member 4 is in its position 4B. Likewise, if the actuation member 4 is moved from its position 48 to its position 4C, automatic feeding of copy sheets is initiated while ink is applied to the master plate. The command for starting the inking and copy sheet feeding operations is given by some of the levers and cams shown in FIG. 1. During the copy sheet feeding operation, copy sheets 30 resting on a copy sheet feed tray 29 shown in FIG. 1 are fed one after another to the impression cylinder 3, and the printed copy sheets are discharged onto a copy sheet discharge tray 31. The number of the copy sheets to be printed is controlled by a counter 32.

Upon completion of the copy sheet feeding operation, the actuation member 4 is returned from the position 4C to the neutral position through positions 48 and 4A. At this time, the actuation member 4 moves while the switching actuation member 18 is in its upper position, thereby preventing the next succeeding master plate from being fed to the master cylinder on which the preceding master plate is still mounted. During the movement of the member 4 from its position 4C to its position 48, the switching member only moves in sliding motion along the arcuate edges 21a and 22a of the cams 21 and 22 respectively as aforementioned, so that the switching actuation member 18 cannot be moved to its lower position.

If the actuation member 4 is moved from its neutral position to its position 4D in FIG. 1 while the switching actuation member 18 is in its lower position, then the arm 15b of the switching member 15 moves while maintained in engagement with the right end of the mountain-shaped edge 21a, of the automatic master plate removal command cam 21 in FIG. 7, thereby causing the cam 21 to move in pivotal motion in a clockwise direction about the spindle 7. Pivotally mounted on a shaft 34 attached to the side plate 5 is an arm 33 which is urged by a spring (not shown) to move in pivotal motion in a clockwise direction about the shaft 34 in FIG. 7. Mounted on a shaft attached to the arm 33 is a roller 35 which is kept in engagement with the depressed portion of a wave-shaped cam edge 21c formed on the outer periphery of the cam 21. As the cam 21 is moved as aforesaid, the roller 35 is brought into engagement with the elevated portion of the waveshaped peripheral cam edge 21c of the cam 21, causing the arm 33 to move in pivotal motion in an anticlockwise direction about the shaft 34 (See FIG. 9). As shown in FIG. 7, a pin 36 is attached to the free end of the arm 33 which pin 36 is received in an opening 5b formed in the side plate 5. As the arm 35 moves in a clockwise direction as a result of the movement of the actuation member 4, the pin 36 moves in the opening 5b from the position shown in FIG. 7 to the position shown in FIG. 9 and issues a command to master plate removal and cleaning units (not shown) to start operation. The cams 21 and 22 are shaped such that the mountain-shaped edge 22a, of the cam 22 has a length which is sufficiently great not to interfere with the movement of the cam 21 when it is moved by the switching member 15.

In FIG. 12, a supporting side plate 38 for a master plate feeding unit 37 and a supporting side plate 40 for an etching unit 39 are mounted on shafts 41, 42, and 43 attached to one of the side plates 5 of the machine.

As the pin 28 for transmitting the command to start feeding of a master plate (See FIG. 7) is moved from its position in FIG. 7 to its position in FIG. 8, the pin 28 moves in the direction of the arrow a to engage a lever 44 secured to the side plate 38. Movement of the lever 44 actuates copy sheet feed unit drive means (not shown), so that a copy sheet feed roller 45 begins to move in the direction of the arrow b to feed the uppermost master plate 47 on a master plate feed table 46 to the master cylinder 1 to be mounted thereon. The lever 44 is pivotally mounted on a shaft 49 attached to a lever 48 which is secured at its base to a shaft 50 rotatably connected on the supporting side plate 38. If the lever 44 is moved in the direction of the arrow a, then the lever 48 moves in an anticlockwise direction about the shaft 50 in slaved relation to the pin 28. A roller support arm 51 is secured to the inner end of the shaft 50, so that pivotal movement of the lever 44 causes the support arm 51 to move downwardly. This causes an etching solution applying roller 52 to move away from a fountain roller 53 and intermediate roller 54 to the master cylinder side, so that the roller 52 is brought into contact with the master plate 47 as soon as it is mounted on the master cylinder 1 to apply an etching solution thereto.

As the pin 36 for transmitting the command to start removal of the master plate (See FIG. 7) is moved from its position in FIG. 7 to its position in FIG. 9, then it moves a lever 55 attached to the supporting side plate 38. The lever 55 issues the command to start operation to a master plate removing unit (not shown) and to a blanket cylinder cleaning unit (not shown).

FIG. 5 shows another embodiment of the switching actuation member according to this invention. As shown, a tubular switching actuation member 62 is fitted over an operation switching actuation lever 61 which is formed at its base with an opening 61a receiving a sliding member 63 therein. A pin 64 secured to the sliding member 63 is caused to abut against the fork 15a of the automatic non-automatic switching member 15. The switching actuation member 62 is formed with an end surface cam 62a at it lower end, so that rotation of the switching actuation member 62 causes the switching member 15 to move in pivotal motion. Any suitable means may be used for bringing the automatic non-automatic switching member 15 into contact with the automatic master plate feed command cam or automatic master plate removal command cam described previously. The end surface cam 620 formed at the lower end of the member 62 in FIG. 5 may be dispensed with and the member 62 may be adapted to merely move up and down. Alternatively, an automatic non-automatic switching member 66 may be secured to the switching actuation member 62 as shown in dotand-dash lines in FIG. 5 and the member 62 may be normally urged to move downwardly, so that when the switching actuation member 62 is moved upwardly the switching member 66 can be brought into engagement with the automatic master plate feed command cam or removal command cam.

From the foregoing description, it will be appreciated that the present invention permits the operator to operate his automatic printing machine readily by selectively switching the machine between automatic and non-automatic operations. The disadvantage of feeding a master plate to the master cylinder on which the preceding master plate is still mounted when the operation switching actuation member is restored to its neutral position can be obviated.

What is claimed is:

1. An ofiset printing machine including a master cylinder, means actuable for feeding a master plate to the master cylinder and for etching the plate, means actuable for removing the master plate from the master cylinder, an actuation member having a single handle, means for mounting said actuation member for movement between a neutral position and a first position for actuating the master plate feeding and etching means, and between the neutral position and a second position for actuating the master plate removing means, means including cam means for connecting the actuation member to said means for feeding and etching, and means including cam means for connecting the actuation member to said means for removing, wherein the improvement is in means for selectively moving the actuation member to the first position without actuating the master plate feeding and etching means and for selectively moving the actuation member to the second position without actuating the master plate removing means, for the purpose of allowing manual feeding and etching of a master plate while the actuation member is in its first position and manual removal of the master plate while the actuation member is in its second posi tion, comprising a switching actuation member carried by the actuation member and having a first position for causing actuation of the master plate feeding and etching means when the actuation member is moved from its neutral to its first position wherein said switching actuation member is in driving connection with said feeding and etching cam means, and for causing actuation of the master plate removing means when the actuation member is moved from its neutral to its second position wherein said switching actuation member is in driving connection with the master plate removing means, and having a second position for preventing actuation of the master plate feeding and etching means when the actuation member is moved from its neutral to its first position wherein said switching actuation means is out of driving connection with the master plate feeding and etching means, and for preventing actuation of the master plate removing means when the actuation member is moved to its second position wherein said switching actuation member is out of driving connection with the master plate removing means, and means for biasing the switch actuation member toward one of its first and second positions.

2. An offset printing machine as in claim 1 wherein said actuation member comprises a hollow shaft and said switching actuation member comprises a shaft slidably mounted within said hollow shaft.

3. An offset printing machine as in claim 1 wherein said actuation member comprises a shaft and said switching actuation member comprises a hollow shaft slidably mounted over the actuation member shaft.

4. An offset printing machine as in claim I wherein the switching actuation member is biased towards its second position.

5. An offset printing machine as in claim 1 including means actuable for inking the master plate mounted on the master cylinder and wherein the actuation member is movable from its first position to a third position for actuating said master plate inking means.

6. An offset printing machine as in claim 5 wherein the switching actuation member is biased towards its second position and including means for moving the switching actuation member from its second to its first position when the actuation member is moved from its first to its third position.

7. An offset printing machine as in claim 5 including

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3766853 *Apr 4, 1972Oct 23, 1973Dick Co AbSystem for cleaning rollers of a duplicating machine, such as ink rollers
US3858508 *Dec 26, 1972Jan 7, 1975Ricoh KkOffset printing machine
US3956985 *Nov 18, 1974May 18, 1976Ryobi, Ltd.Operating lever mechanism for offset printing press
US3998159 *Sep 20, 1974Dec 21, 1976Image Duplicating Systems Inc.Pattern copying machine
US4027588 *Jan 22, 1976Jun 7, 1977Ryobi, Ltd.Control mechanism for an offset printing machine
US4084508 *Aug 17, 1976Apr 18, 1978Ricoh Company, Ltd.Offset printing machine comprising improved control mechanism
US4134341 *Dec 30, 1976Jan 16, 1979Rolf Erich MullerDuplicating apparatus
Classifications
U.S. Classification101/142, 101/425, 101/148
International ClassificationB41F7/02, B41L39/00
Cooperative ClassificationB41L39/00
European ClassificationB41L39/00