US 1666004 A
Abstract available in
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Description (OCR text may contain errors)
M. A. DROITCOUR SHEET PRINT-ING PRESS April l0, 1928. v
April 1o, 1928.
M. A. DROITCOUR SHEET PRINTING PRESS 46 Sheets-Sheet 2 Filed Aug.
April 10, 1928.
M; A. DRol-rcouR SHEET PRINTING PRESS e sheets-sheet s Filed Aug'. 29. 1923 April 1o, 19526. y 1,666,664
M.` A. DRorrcouR SHEET PRINTING PRESS Filed Aug- 29, 1925 6 sheets-sheet 4 46C ma April 1o, 1928.
M. A. DROITCOUR SHEET PRINTING PRESS Filed Aug. 29.. 1923 6 Sheets-Sheet 5 April 1o, 192s.
M. A. DROITCOUR SHEET PRINTING PRESS Filed Aug- 29. 1923 6 Sheets-Sheet 6 Fig. 16.
Patented Apr. 10, 1928. l
UNITED Y' STATES l 1,666,604 PATENT OFFICE MIC'HAEL ANDREW DROITCOUR, 0F PRVIDENCE, RHODE ISLAND.
Application led August 29, 1923. Serial No. 659,937.
This invention is a novel improvement in sheet printmg presses, and has particular reference to the various means'for advancing the sheet from the feed table through the press to the delivery table. n The objects of the invention are; to have the delivery table and the feed table at the sameend of the press, and the delivery table preferably below the feed table; so 'that both will be conveniently'under the observation of the pressman; to provide novel means for the sheettaking position on the feed board to thelimpression cylinder so that the sheets may be delivered directly from the impression cylinder, printed side up toward the Adelivery'table at -the feed end of the press; to provide Anovel means for forwardino' the printed sheets from the impression cylinder tothe deliverytable; toprovide a transfer cylinder bet-Ween the feed board and the delivery board to enable the sheet to be delivered without lhaving its printed side touched; lto provide pneumatic means for holding the sheet ona cylinder after the cylinder grippers have released the sheet; to
rovide means whereby grippers on the vcylmders can be arranged in alignment and posts in the cylindersto co-operate with the lgripper's dispensed with; to separate the top A sheet from the feed pile without the necessity. of using drop rollers closing tapes, or like mechanical devices such as are now cornmonly employed in. separating sheets and feeding them from the pilel to the feed board; to provide the feed board and parts thereon so that same may be raised when it isdesired to get access to the underlying parts of the press; to provide novel means for timing the suction action of the sheet ad* vancing means on the feed board, so that thesheet. will be properly handled; to employ the feed tapes las part of thev suction 'channels by which the sheets are advanced Vover the feed and lalso delivery if desired.
I will explain the invention with reference to the accompanying drawings to enable others to adopt and use same, and set forth inthe claims the essentials of the invention, and the novel features of construction, and novel combinations of parts, for all of which protection is desired.
' Fig. 1 is a partial side elevation of a sheet printing press equipped with my novel sheet handling mechanism.
Fig. 2 is a top plan view of Fig. 1. Fig. 3 is an enlarged sectional view on the line 3- 3`, Fig. 1.
' Fig. 4 is an enlarged diagrammatical view illustrating the operation of the devices for transferring the sheets from the pile to the feed board. i
Figs. 5A and 6 are enlarged side and end views of one of the'sheet registering boxes. Figs 7 and 8 are detail sectional views of` one of the suction valves.
,Fig 9 is a detail sectional View of the y transfer and impression `cylinders showing the suction .sheet holding devices of thev transfer cylinder.
Fig. 10 is a detail view of the pile feed controlling devices. y p Fig. 11 is a detail sectional view illustrating the air suction passage formed by the feed board and sheet feed tapes.
Fig. 12 is a reduced side elevation of the press looking at the side oppositeA to Fig. 1.
Fig. 13 is a detail end elevation, partly broken of the device for operating the fee ing pile, and the sheet delivery pile.
Fig. 14 i's a detail view of means of operating one of the air valves.
Fig. 15 is an enlarged sectional view of one of the suction valvesA vfor the feed board.
Fi s. 16,17, 18 are'detail views illustrating t e means for flufling the sheets on the feed pile. Y v
Fig. 19 is adetail top plan view of a feed board with adjustable sets of tapes.
Figs. 20, 21, 22 are detail views of the feed pile controlling devices.
In the accompanying drawings the invexition as shown is'applied 'to a flat bed and cylinder press preferably of the type inwhich the cylinder makes two revolutions fefi each reciprocation of the bed, but is adaptable to other types of presses.
As shown the impression cylinder 100 is driven by a. gear 101 which is driven by intermediate 102 from a gear 103 on the driving ily wheel shaft 104; and gear 105 on intermediate 102 meshes with a gear 106 on a A shaft 107 which makes three revolutions in unison with the cylinder for each reciprocaiion of the bed.
On the shaft 107 is a beveled gear 108 which meshes with a beveled gear 109 on a counter shaft 110 that extends toward the feed end of the press and carries a beveled gear 111 which meshes with a beveled gear 112 on a vertical shaft 113 carrying a beveled gear 114 which meshes with a beveled gear 115 on a short stub shaft 116 suit-- ably mounted in the feeder framing; and on the inner end of this shaft 116 is a sprocket 117. Mounted on the frame above the sprocket 117 is a similar sprocket 217 mounted on a stub shaft 216; over sprockets 117 and 217 runs a sprocket chain 1 which chain is continuously driven by the means described in unison with the movement of the impression cylinder. The chain 1 may be provided with an adjustable slack taking up or tensioning means, such as indicated at 1n in the drawings, to maintain proper tension thereon.
The chain v1 carries a pin l" which is adapted to engage with any one of the slotted yokcs 2" attached to an endless cha-in 2 which runs over upper and lower sprockets 2 and` 2 mounted on stud shafts 2d and 2f attached to suitable framing mounted on the press.
The sprocket 2 is attached to a pinion 2g which meshes with a pinion 3 on a stud shaft 3, and the pinion 3 is connected to a stud pinion 3l` which meshes with pinion 4a on the end of a shaft or tape roller 4 which is journaled in suitable bearings in the frame adjacent the outer end of the feed board 5, the outer end of which feed board is provided with hinge yokes 5a, by which the feed board is pivotally supported on pintles 5" on the main frame so that the feed board can be raised; the inner end of the feed board when lowered is supported on brackets 5L on the framing adjacent the transfer cylinder. This feed board is hereinafter referred to.
`brackets attached to the framing; the lower end of each ofthe rods 69 is provided with framing, and on one en a spiral gear 68 meshing with a spiral gear 67'on a shaft 63 suitabl journaled in the of this shaft is a ratchet 64, adapted to be engaged by a pawl on an oscillatory arm 62, pivotally mounted on the shaft 63, and one end of said arm 62 is pivoted to a link bar 61, the other end of which link bar has a vertical slot 61a engaging a pin ,22 on the face of a crank 22 which is mounted on a shaft 21 adjacent the sprocket gear 217, and is driven from the sprocket gear 217 by means of a inion l23 fastened on sprocket 217 meshing with a pinion 23*l on shaft 21.
Pinion 23 rotates continuously during the operation of the machine, and consequently would tend to impart oscillatory movement to the pawl 65 at all times, but to prevent this oscillation, except at the proper time, I provide a trip lever 77 which is pivoted on a stud 77L adjacent the pawl 65 and normally depends in position to engage the arm G2 when in its depressed condition and to hold it in this position so that the rod 61 is held elevated and the pin 22 works idly in a slot in the link 61. Ifthe trip is disengaged from the pawl 62 then the Ylink 61 drops and causes the arm 62 vto oscillate and the paw-l 65 to raise and the pin 22a engaging the upper end of the slot in the link 61 will draw the link forward and thus depress the pawl and impart motion to the shaft 63 through the ratchet 64.
The engagement of the pawl is determined by the height of the pile of paper on the table and a detector (described separate)..
As shown the short arm of the trip leverv 77 is engaged by a rod 76 the upper end of which is attached to an arm on a rock shaft 74 to which is attached an arm 71" which carries a feeler plate 71 adapted to rest upon the top of the pile of'paper on the table 70. On this shaft 74 is splined a block 74" carrying two projecting pins 74 which y are engaged by a pin'71 on theshaft 71 which is pivotally mounted at `one end on a block 82 which is fastened to the tube 81 adjacent the shaft 74. The other end of the shaft 71 is pivoted on the block 81 also hung from the sleeve 81. The block 82 is bifureated at its lower end to loosely embrace the block 74" on shaft 74 and this ermits the block 81 and shaft 71 to be adjusted with the sleeve 81 to stand various sizes of sheets of paper in the' pile and the shaft 74 is turned to adjust the plate 70 of the feeder. When 'the pile of paper is at the proper height the plate 71 will be elevated sufficiently to hold Yrock shaft 71 so that the arm 71a engaging pins 74 will hold shaft 74 in such position that rod 76 will be elevated permitting the trip 77 to engage the arm 62 and hold the pawl 65 inactive. But as the pile is lowered by the feeding of the sheets plate 71 lowers and permits shaft 71 to turn and permit the loweringof rod 76 until it disengages the trip 77 from the ratchet; whereupon the lever 62 is oscillated by the means described and imparts rotary motion to the shaft63; which in turn causes the screws 69 to elevate to the table 70 until the top of the pile is raised sufficiently to cause plate 71, through the described connections, to raise rod 76 and The sheets are fed from the pile onto the table 5 as hereinafter described. In the conv struction shown a receiving or delivery table 7 0x is arranged at the end of the press directly below the feed table 70. For every. sheet fed from the top table 70, av sheet Will be deposited upon the pile on the delivery table 7 0x. At the beginning of the operations when table is in its lowest position the table 7 0x Would be in its highest position. The table 70x is constructed. and operated substantially' like the table 70 but is preferably inclined as shown, so that the sheets can slide readily thereonto; as shown table 70X is provided with a bar 70ax having its ends threaded to engage threaded rods 69x which are suitably journaled in the frame.; and these rods 69x have spiral gears 68x on their upper ends meshing with spiral gears 67x on the shaft 63", (Fig. 3) and shaft 63x has a gear 66x meshing with thegear 66 -on the shaft 63. The construction is such that each time the table 70 is elevated (or lowered) the table 70x will be lowered (or elevated) a corresponding extent; and the elevating and lowering of both tables 70 and 70l is governed by the above described trip mechanism, by which the operation of the shaft G3 is controlled as above described.
The sheets are fed successively from the pile on table 70 lonto the feed board, by means hereinafter described, and are carried down the feed board and registered both longitudinally and laterally against the sheet stops by means'hereinafter described.
It will be seen that the unprinted sheets vare fed from the pile mounted on the feed table at the samel end of the press when the sheets are delivered; and the sheets are de'- livered 'on the receiving table arranged beneath the feeder table. This vproduces a very compact press and enables the operator ,to easily control the feed and the delivery at the same end of the press, andv this is a great practical advantage particularly on presses of the smaller size. A v
The sheet stops or front guides 40S in the press shown co-operate with a transfer cylinder 99 which is practically the same size of the impression cylinder 100 and is suitably journaled above the samel and is providn with grippers 99" which operate in the usual manner and are adapted totake a sheet from the feed board and transfer it to the grippers 1(4)0b of the impression cylinder in the usual manner. After the sheet `has vbeen printed itv is released by the cylinder grippers and stripped from the impression cylinder by strippers 130 attached to a rock shaft 131 supplied with an arm 132 which is pivoted to a link 133 which is op'eratedlin the proper time by a cam 38 on a stud shaft 34 and which shaft is provided with a gear- 34l meshing with a pinion 99 onthe shaft 99"v of the transfer cylinder .99, the gearing being so proportionedthat the'strip ers 130.
will be moved in' andl out and hel l,in and i out of'operative position at the proper time during the rotation of the press. The pri-nt'- ed sheet is directed by the strippers 130 onto a set of delivery tapes 140 running overguide rollers 141 and 142 suitably mounted in the machine; the 'sheets passing over the i I roller 142 onto the delivery pile on table 76. as indicated in the drawing.
The means for feeding the sheets'.
11 mounted on arm 12 attached to a hollow' shaft 13 which is in turn attached to links i 14 pivoted or 'suitably connected to arms 15 mounted on a rock shaft 25 Which is suitablyl journaled in suitable framing'on the.
press above the feed table.
To one of the links 14 is attached an arm 16 which is slidably supported on apin 17 attached to the free end of a lifting lever 17 which is pivoted on a stud 18, attached to a suitable part of the framing, see Figs. Y
2 and 4; link 17 is pivotally connected at 17 b to one end of a link 19, the other end of which is bifurcated or slotted to embrace the shaft 21.and be guided thereby and link 19 is actuated by a cam 20 attached to the shaft 21, see Fig. 4.
As shown in Fig. 4 the suction boxes 11 may be of any-suitable construction and are connected by hose section 11B to the pipe 13;
and said pipe 13 may be. connected to a suction apparatus of any suitable kind, not shown, by Which suction isproduced in the pipe and in the boxes 11.
The shaft 25 has an arm 26 on one end connected to one end of a link 27 which is l'lO operatively engaged by a cam disk 28 on a shaft 21 journaledin the framingand .having a gear 23a on its inner end meshin with a pinion 23 on the shaft 216 (see Figs. 2v and 4). The cam 28 is operated insuch time and manner that when a sheet is to.,
be fed fromthe pile to the feed board the suction boxes 11 are first raised from the position shown in full lines in Fig.. 4, to the position indicated in dotted lines :I: in Fig. 4 by the action of the cam 2 0 link 19 and arm 17; then, While the link 17 is held in this raised position, the cam 28 through link 27 and arm 26 rocks shaft 25 and moves the elevated suction boxes 11 from the position shown in dotted lines (Fig. 4) to the position shown in dotted lines y in (Fig. 4). Then after the sheet has been in height; and each sheet will be lifted in a straight curved line and will have a natural curve, according to its own tension or spring, and will be passed to the feed board .with almost the same movement used in manually handling the sheet; the boxes ,moving as described impar-til yg a wave or winding motion to the sheet so 1s to get air under the whole sheet as is done in hand feeding, thus facilitating the separation of thc top sheet from the pile. Y
In order to facilitate the removal of the top sheet from the pile I provide means for flufiing the top sheets by air. For this purpose a plurality of air jet heads 300 are arranged adjacent the top of the ile, below and between the shaft 4 and tlie top of the pile S (see vFigs 16, 17, 18) and are connected by liexible sections 301 to air pipe 302 which lcan be connected by a hose 303 to'an air blower not shown. have slits 304 in their sides adjacent the u per end of the pile through which jets of) air are directed against the adjacent edges of the top sheets to cause the top sheet in the pile to fluff up, so that when the top sheet is lifted by means of the suction boxes 11, as above described, it isimmediately seperated from the vother sheets by the air blown between the sheets, which prevents the raising` of more than one sheet at a time from the pileby the suction boxes.
y the. suction boxes 1.1 so that the forward edge of the sheet lies beyond the roller 4b and lies Jupon the sets of t-apes T; which tapes .extend from roller 4" at. the outer end of the feed board to and over rollers 4e suitably mounted at the adjacent end of the feed board as indicated so the upper runs of the tapes T lie upon and close to the upper surface 0f the feed board, or in slight recesses in the feed board if desired, while the return run of the tapes pass back under the feed board. i n
As shown these tapes T are arranged in pairs, two pairs being shown; the tapes in each pair being parallel and near together the slight space between adjacentedges of thc tapes in each pair forming an air suction channel (see Fig. 11) whichv is normally open but is closed by the sheet lying on the tapes, and I have found that when a` sheet is laid upon these tapes and a suction is created in the space between the tapes and overlying sheet, the sheet will be held to the These heads l .a valve 4041.
tapes and caused to travel therewith by .the suction. 'i
To facilitate the advance of the sheet on the table the suction is created progressively along the length ofthe spaces between the pairs of tapes between'the rollers 4b and 4, by means of suitable suction openings indicated at 201, 202, 203, 204, 205, in Fig. 2; which openings are respectively connected by pipes 211, 212, 213, 214, 215 to suction valves 221, 222, 223, 224, 225, respectively; and said suction valves are all connected with a common suction pipe S which is connected by ahose S to the air pumpnot shown. As" indicated in Figure2the several pipes 221 to 215 may be provided with flexible or adjustable sections 211, 212, 213, 2141, 215, respectively, the free ends of which may be plugged into any one of the related series of openings 201 to 205 according to the position in which the sets of belts T are adjusted. The belts can be adjusted laterally o n the feed table to suit different widths of paper; and the free ends of the sections 211a to 215a can be plugged into the proper opening between the belts of each pair.
The air valves 221 may be of any suitable construction, and I do not deem is necessary to show all of them in detail as they all may be operated alike. One of these valves is shown in section in Figs. 14, 15. Each of these valves preferably comprises a body 400 having an outlet opening 401 to which a pipe 211 (212-3-4-5, etc.) is connected. It has a bore 402 communicating with the pipe S and the outlet opening, and provided with a valve seat 403 closed by The stem 405 of this valve projects below the body, vand the valve is normally pressed by a spring 406 on the projecting end of the valve. These valves raise and lower with the feed board. When the board is lowered the stem 405 of each valvelies above a related lever which is p ivotally mounted on a rod 501 attached to an adjacent part of the framing (see Fig. 14) above the s haft21. This lever 500 is connected to the upper end of a link 502, the lower end of which is bifurcated or slotted as at 503 to embrace] the shaft '21; and on this link 502 is a roller 504 which engages a related cam 505 fixed to the shaft 21. vThe cams 505 are so formed and relatively adjusted that atthe proper' times the several levers 500 will be raised to contact with the related valve stem, and open the valve whereupon suction will be created through the related openings in the feed board in the manner and for the purpose described.
The pipe 13 is connected by a hose 13b to a suction box 13c on pipe S. The suction valves 13c and 211 to 215 respectively may be operated by any suitable means in the well known manner so as to be opened and 4mally tends to rock the lever to closed at the proper time to receive pipes to which they are, connected or prevent the same as required. Thus the suction' would he created in the pipe 13 just before the boxes 11 are raised to lift ashcet on the feed board and suction will be maintained in the boxes 11 until they have passed the sheet onto the feed board at the posit-ion indicatedv in d ottcd lines y in Fig. 4 at which time the tapes T are stationary and when the suction boxes 11 place thesheet upon the tapes as indicated Iin dotted lines a: in Fig. 4 then the suction is created in the pipes 201 and this creates a suction in. the space between the tapes T and holds the sheet thereto. Then the suction is released from the boxes 11 and the latter raised while the sheet is held to the tapes by the suction in pipes 201, and then as the tapes begin to move the sheet down the feed board suctionr is successively created in the pipes 212, 213, 214, 215 until the sheet is brought close. to position near the front sheet stops 40s. The cams may be so arranged that as the sheet is advanced suction is created successively in the pipesand successively cut off in the pipes..
The from register.
The front register devices are preferably ings in the framing above the transfer cylinder 99. The rod 40a is provided on its rear erd with an adjusting nut 40b and is normally projected outwardly, as far as permitted by the nut, by means of a spring 4()c interposed between the plate 40s and the casting 40. Projecting through an opening in the stop 4()s is a suction box 40d which has an aperture 4 in its under side and is movable longitudinally and at right angles to the shaft 43. V
Each suction box 40d is connected by a hose 40e to aI suction pipe 47s, journaled in the framing in rear of shaft 43, provided with a suitable suction valve and operating connections.
The box 40d-is connected by a link 40f toone end of a lever which is pivoted at 45a on the casting 40; 'and to thisvlever, below its pivot, is pivotally connected a rod 45'uwhich passes through a guide 40g on the casting 40,
and a spring 45d is strung on the rod 45',s between the lug 40g and the lever 45 and nordlfaw the suction box inward toward shaft 43el 1 The other end of lever 45 is connected by a link 46 to an arm 47 on theshaft 47s and on shaft 47s is an arm 31 which is pivotally connected to a link 32, the other end of which is slotted to embrace the shaft v34 and be guided thereby. This lever 32 carries a shown) and suitable means are roller 32 engaging a cam 33 on the shaft connected by the suction apparatus (not provided (not shown) whereby the valve 47 could be opened or closed at the proper time to produce suction .inthe pipe 47s and boxes 40d and relieve the suction therein at the proper time.
The parts are so arranged that as or before the leadin edge of the sheet leaves the lower end of tic feed board 5 the shaft 43 is rocked to lower the front stops 40s into the path of the sheet and the sheet is released from the suction on the tapes T just as or before its leaving edge reaches the stops 40. Then the valve on hollow shaft 47B is actuatedso as to create suction in the boxes 40l and take hold of the sheet nearest the leading edge, and then hollow shaft 4 s is rocked s0 as to oscillate levers 45 in a direction to ermit spring 45to move the suction boxes 40'l slightly rearward so that they will register the front edge of the sheet against the stop 4()s before suction is cut oft' in said boxes.
The side register.
After the sheet is properly forwarded against stops 40s it is wide registered by means of a suction box 40, similar to the box 40d, mounted on a rod 40, similar to rod 40a, carried by a casting 40x supported on a. rod 43X detachably mounted on the end of the feed board 5. The lever 45x of this device is connected to one arm of a bell crank lever 49 the other arm of which is connected by a rod 49il to an arm 49b on a hollow shaft 49c which is journaled in the frame and has a crank arm 49d on its outerend which engages a race cam 49e on the shaft 34.
The shaft 49 is hollow and is connected by a pipe 40eX to the box 40dx and en the outer end of theshaft is an air valve box 40f (similar to valve 47) connected to the suction apparatus (not shown) and suitable.
lmeans are provided not shown) whereby the .valve 49r may be opened or closed at the proper time to produce suction in the box 40. i
The cams and suction boxes are so 'arranged that at the ter box 40dx will be engaged with the sheet proper timethe side regis'-k of paper and then be moved laterally so as I to register the sheet of paper sidewise. The
"registering movement of the box 40 is so timed as not to interfere with the registering movement of the front registering boxes 40.'
The suction valves 47 c and 49f may be made as shown in detail Figs. 7 and 8. As shown the valve body 47c is attached at one side to the end of the shaft 47 and has an air suction pipe 47t connected to its opposite side opposite the end of the pipe 47". The valve member 47 is normally held in the position shown in Fig. 8 where it presents an imperforate surface between the adjacent endsof pipe 47 and pipe 47K The Valve member 47#l is pivoted on a rock shaft 47x which may be rocked by a suitable cani at the proper time so as toraise or, lower the valve 47. This valve member has a hole 47 in it and when the valve member is lowered the hole 47W establishes direct communication between pipes 475 and 117i, and then suction is produced in pipe 47s, and this suction continues until it is cut off by valve member 471.
Upon the sheets on the feed pile yieldingly rest spring finger 8O which are connectedto a tube or a hollow shaft 81 which is fast in boxes 82 which slideon rack bars 83 mounted on the sides of the frame. These rack bars 83 are engaged by pinions 84 attached to a rod 85 which extends through the' hollow shaft 81 and is providedwith a hand wheel 86 by which the rod 85 may be turned manually, thus the hollow shaft 81 with fingers 80 may be advanced inwardly or outwardly ac'pording to the lengths of the sheets on the 1 e. p The transfer cylinder 99 is provided with gripper fingers 99b which may be operated to open and close in the usual manner, and the sheets are so fed that they overlap the 1 edge 99W of the transfer cylinder, as shown in Fig. 9, when the grippers 99h are closed thereon. A suction boX 190 is arranged inside the surface of the cylinder 99 and is provided with apertures 99X opening through the outer face of the cylinder. is connected by a pipe 191 to a bore 192 in the shaft 99b of the transfer cylinder; and this bore is connected by suitable means with a suction pipe 193 which leads to the vacuum pump, and a suitable suction valve (not shown) is provi-ded and operated by a cam (not shown) so that after the gripper-s 99b have taken the sheet from the feed board and before they release the sheet the suction is created in box 190 suficient to hold the sheet to the transfer cylinder with its edge projecting beyond the face of the bar 99W as shown in Fig. 9 giving' the impression cylinder grippers 100b room to fully engage the sheet as indicated in Fig. 9 after the grippers 99b have been opened. This does away with any interference of the grippers at the transfer point, as the suction holds the sheet to the transfer cylinder after the grippers' 99b are opened and suction is cut ofi' to release the sheet just as the tngerslOOb of the impression cylinder 100 take the sheet. This does away with the necessity for posts under the grippers on other cylinders, and enables impressions to be made very close to the edge of the sheet.
. By holding the sheet to transfer cylinder The box 190.
by suction as above described the grippers on both cylinders 99 and 10() can be in alignment, and there will be no interference between them. This will dispense with the necessity of providing posts usually employed on the cylinders for the grppers to with the grippers) if a. card say .025 thick y was being prlnted then the posts would have to be lowered .022 to bring top of sheet on pitch line; obviously when a heavy sheet is to be printed the packing on impression cylinder must be reduced as otherwise there would be too much impression and smash type etc. In my press the grippers on transfer cylinder 99 open before there can be any interference with the closing of the grippers on the im iression cylinders and when they are open t e suction holds the sheet to cylinder 99 until the grippers on the cylinder 100close on sheet.
If desired while I have described the suction tapes as used only on the feed board suction might also be used in connection with the 'delivery tapes 140. vThese could be arranged in pairs between the rollers 141 and 142 and operated as described to transfer the sheet positively from the impression cylinder 100 to the delivery 'table 70".
In presses adapted to ,handle sheets of large size, I may provide more sets of air suction tapes. In Fig. 19 I show three sets of such tapes: One set T being at the center of the feed board, and sets of tapes /T2 and T3 are arranged parallel with but on opposite sides of the central set oftapes. All of these tapes may be driven from the shaft L1, as above described; but the tapes T2 and T3 run over elongated rollers 40X; a plurality of parallel sets of apertures 201-2-8-4-5 etc., are provided i'n the feed board, and the sets of tapes T2 and T3 may be adjusted toward or from the tapes T to suit the size of sheets, and the preferably related 'sets of said apertures.
On a small press say handling sheets of 22 inches, it is not necessary to use the adjustable tapes; but for larger presses three or more sets of tapes are preferable,l the outer tapes being movable as described, so they can be adjusted to suit the Width of the sheets being printed.
lution shaft 107 through miter bevel gears to twenty tooth sprocket 117 which operates the 60 link chain one revolution to each inrpression. 'lhe ,chain l has a in which engages a yoke 2" on driven chaln 2 and opel'- ates the tapes T on feed board intermittently. 'lhe suction pipesl under feed board are connected through valvesto vacuum pump. Valves are operated by cams on shaft which is driven one revolution to each impression of press.
The pile of papel' to be fed is supported on board 70 and the pile' is kept at normal height by the devices controlled by the plate 71 resting on top of pile. When pile, is
reduced the trip 77 relea-s s bell crank 62 and crank pile is forced't normal height by the spiral gears 67-68 and screws 69.
The top sheet is engaged by the suction boxes 11 (preferably three as shown) which are swung (Fig. 4) to lift the forward end or edge of sheet. Then the suction boxes advances`4 the sheet over (to left) and holds leading part of sheet in practical contact with upper face of feed board over tapes T. (The tapes are not travelling at this time). Then t-he suction goes. on first set of holes 201 between each set of tapes holding sheet to tapes. Suction boxes l1 then releases sheet. Then the pin lb on power chain l engages a yoke 2l and travels tapes T and sheet toward transfer cylinder; when the pin leaves the yoke the tapes are stopped, and sheet is then in position to be registered to gauges by the register mechanisms. The sheet is controlled in its movement toward the cylinder by progressively apply- -ing the suction as lead end of sheet gets to openings 202, 205 and closes vacuum as tail of sheet passes these openings. By this means the vacuum is 'not lost or overly weakened.
The sheet is then registered by action of suction boxes 40 and 40"x as described.
The grippers on transfer cylinder take the sheet from the feed board (after register) and suction holds the sheet to cylinder as grippers are opened so as not to interfere at transfer point to impression cylinder. From the impression cylinder 10() the sheet is directed by strippers 13v onto the deliverv tapes 140 and by them delivered onto the delivery tables 7 0".
The feeder pile being over the delivery pile effects a saving of space and overcomes the long travel of sheet from .tapes with suction applied between them By employing the transfer cylinder 99 to l "transfer sheets from the feed board to the f impression cylinder I am enabled to deliver ,the sheets printed side up without having the pile to 'cylinder\. also from cylinder to delivery. The twin the sheet will be brought into contact with f the whole face of the guide and I do not have to employ posts on either side of the registering member as heretofore necessary, andthe registeringmeans can be lifted with the guide. v
The novel features of my invention are the employment of side by side tapes with suction between them for advancing (feeding or delivering) the sheets, without hav ing to employ any co-operating devices on the top of the sheet when advancing same. This is especially useful in the delivery of sheets, as the top of the sheets have a freshly printed surface and it is highly desirable that nothing shall come in contact with the freshly printed surface. Arranging the feed pile above the delivery pile gives the opera-y tor better control as both feed and delivery are at same end of press. By using the transfer cylinder` before sheet is printed there will be no smutting of printed sheets or offset caused by the freshly printed surfaces coming in contact with the transfer surface, such as the reels used in drum cylinder presses and on two revolution rear delivery presses. Heretofore in both one revolution or two revolution presses the only delivery 'used was a ily, delivering printed side up but by using the transfer cylinder in advanceof printing I can use a tape delivery and deliver sheets printed side up without touching the printed side of sheet. l
Another desirable feature is having the register devices as parts of guides and having the sheets -brought into contactwith.
ders in line without interference, whereas in other makes of presses the grippers cannot be in line, and the cylinders' are provided with posts to permit clearance between the grippers` and in other presses these posts must be adjustable for height or thickness of paper.
Another feature of the invention is using same member as' 11 to separate the'top sheet and place sheet ontofeed board without the use of drop rollers', or closing tapes. I use suction throughout. The advancing member or feed board 5 is hinged to allow access to parts underneath. My design allows access to impression cylinder for putting on makeready etc. without having to lift the advancing mechanism or feed board, which cannot be done'on any other machine (of the two revolution flat bed type). I also propose tomount my rollers, vibrators, and ink fountain so that-they can be moved laterally around a post out of the way in makmg ready the forms if desired.
Another advantage is having the timing stop and suction presses set forth in original 'claims 24 to 32; nor that arrangement of impression and transfer cylinders set forth in original claims 37 and 38; nor that particular arrangement of feed and delivery tables set forth in original claims 41 to 15 inclusive, nor the particular suction sheet device set forth inoriginal claims 17, 18 and 22; and reserve my right to file divisional applicationson the subject matter of such Claims. i
What I claim is:
1. In a printing press of the character specified, sheet advancing means comprising a support, adjacent endless tapes having runs lying on the surface of said support, said tapes being arranged close together, the space between the tapes the support and a sheet laid on the tapes forming an air channel; and means for creating suction in said channel, whereby the sheet is held to the tapes by suction and is moved forward by the tapes when the latter are travelled.
2. In sheet advancing mechanism as set forth in claim 1, means whereby the channel and suction in the channel is progressively advanced as the sheet is progressively advancedk by the tapes substantially as described.
3. In a printing press, having a feed table, and a, feed board, and means for feeding sheets from the table to the feed board; means for advancing sheets on the feed board, comprising adjacent endless parallel tapes having runs lying on the surface of said board, said tapes being arranged close together; the space between the tapes, board,
and a sheet laid on the tapes forming an air channel, and means for Creatin-g suction lin said channel through thefeed board when thev sheet is laid upon the tapes whereby the sheet is held to the tapes by suction, and is lmoved forward on .the board by the tapes when the latter are travelled.
4. In sheet advancing mechanism as set forth in claim 3 means whereby the suction sively created as the sheet is advanced by 'the tapes, substantially as described.
5. In a printing press as set forth in claim 1, means for operating thc'tapes intermittently, comprising an endless chain, means for operating the tapes from said chain; a second'endless chain adjacent the first chain; means for continuously driving the second chain; and interengaging pins and yokes on the chains whereby the tirst chain is intermittently driven from and by the second chain. l
6. In combination with mechanism asset forth in claim 1, means for intermittently operating the tapes synchronously with the printing mechanism and once for each printing operation of said mechanism.
7. In combination with a support adjacent, side by side tapes for advancing sheets over the support, and means for applying suction to the under side of the sheet in the channel formed by the space between said tapes the sheet and the feed board.
S. In combination with a support, sets `ofv f'side by side tapes for advancing sheets over the support, said sets of tapes being relatively adjustable to suit different sizes of sheets, and means for creating vsuction through the support in the' channel formed by the space between the tapes in each set the sheet and the feed board to hold the sheet to the tapes.
10. In combination with a feed board, sets of side by-side tapes for advancing sheets over the feed board, and means for applying suction to the bottom side of the sheet in the channels formed by the spaces between the tapes of each set'on the runs thereof contacting the feed board the sheets and the feed board.
11. In combination a feed board, sets of side by side tapes for advancing sheets over the feed board, said sets of tapes being relatively adjustable to suit different sizes of Sheets, and means for applying suction to the bottom side of the sheet through the feed board in the channels formed by the spaces between the adjacent tapes of each set the sheets and the feed board.
In testimony that I claim the foregoing as my own, I affx my signature.
MICHAEL ANDREW Daorrcoun.