US1748894A - Stop-cylinder printing machine with sheet delivery at the front - Google Patents

Description

Feb. 25, 1930. A NEUMANN 1 1,748,894

STOP CYLINDER PRINTING MACHINE WITH SHEET DELIVERY AT THE FRONT Filed Jan. 23. 1928 4 Sheets-Sheet 1 W fiummwm i 1 Feb. 25, 1930. A. NEUMANN 1,748,894

STOP CYLINDER PRINTING MACHINE WITH SHEET DELIVERY AT THE FRONT Filed Jan. 23, 1928 4 Sheets-Sheet 2 Fb. 25, 193 0. Y I NEUMANN I 1,748,894

STOP CYLINDER PRINTING MACHINE WITH SHEET DELIVERY AT THE FRONT Filed Jan. 23. 192a 4 Sheets-Sheet a A. NEUMANN 1,748,894

STOP CYLINDER PRINTING MACHINE WITH SHEET DELIVERY AT THE FRONT Feb. 25, 1930,

Filed Jan. 23, 1928 4 Sheets-Sheet 4 Patentecl Feb'.25,'193t) I r I v a 1,748,894

, UNITED STATES PATENT OFFICE g r ALBEk'iwiNEUMAltTN, or ooswIG, GERMANSI I I S OP-CYLINDE m e ivincninn WITH 'sr'rnnr nEIl v nY A1 THE rnonie Applicationfiled J anuary 23, 1928, Seiial'No. 248,877, and in eG -ermany fanuary 27, 1927..

Stop-cylinderprinting-machines with sheet grippers air suction nozzles might be substidelivery at the front in which'the grippersof tuted which suck on the sheet from the layingthe impression cylinder are situated in proxon table and convey the same totheimpresk imity to the line of contact between the imsion cylinder-grippers. After thesegrippers- 5 pression cylinder and the platen have become have closed, the suckers release the sheet and .55 I known. 4 1 oscillate back. In'order that the oscillatable In one of the machines of this type the arms, pivotally mounted on the axle ofithe sheet is laid from above on the grippers of impression cylinder, carry ,out'their oscillatthe impression cylinder and conducted, ling movement uniformly, i. e.v are not turned 7 7 10 during the rotation priorto the impression, the one towards the other, they are driven 60 to the grippers of an intermediate cylinder, from acontinuously revolving shaft, mounted these grippers delivering the sheet to a second 7 on the outer side of the impression cylinder gripper system, arrang'ed on the impression by means of'toothed segments or thelike. cylinder and running aftersaid first men- The advantage of'this inventionis,that.the

. l5 tionedT gripper-system, and bringing the sheet can be laidon easily and accurately' and 65 sheet delivering device. Forth preliminary centric 5 carried y the haft Les the sheet close to the line of impression, when that it can be brought .by the preliminary the impression-cylinder is in the stopped posigrippers or suckers directly to the impression 1 tion. In this form of" construction the sheet cylinder-grippers so that no di-iferencesof fit is transferred twice to other'grippers,'wherecan occur is from differences as regards fit may result; An'embodiment of the invention is illus- 79 According'to another form. of construction trated, byway of example, in the accompanythe laying-on table is brought directly above ing drawing in which v the plate and the sheet to be printed islaid Figs. 1 and 2 show the mechanism in two on the impressioncylinder from below; As different working positions. l '1 y. however the sheet-deliverer is situated above H 3 is an assembly view --of the:inven- 75 the laying-on table, the laying on of the sheet tion applied to a printing press, indicating is rather diflicult as only -a comparativelythe'cooper-ation of the several printing and small space is left between the laying on feeding elements; r table and the sheet-deliverer, The sheetcan Fig. 3 is a detail View to be associated be observed only from theside and a further with Fig. 3, to show the cams for working v 0 inconvenience is, that the laying on table is the sectors and'locating or justifying devices. darkened by the sheet-deliyerer above the 7 Figs. 4 and 5 show portions ofthei'prelimisame. 7 n p w c nary grippersystem in the positions occupied According'to the invention the sheet to be during transfer of the sheet to theimpression printed is'laid during the rotation of-the cylinder grippers. y f

impression cylinder from' above against the The impression-cylinder a is shownin the marks of the laying-on table. As soon as the position of rest. Its motionis derived from impression-cylinder has stopped and theprethe shaft 1, which is used to drive all the viouslyprinted sheet, the printed side turned components of the machine. During its 1100- 40 p the beginning of the printing moving tion the impression cylinder remains in first, has rolled ofl towards thesheet-delivertoothed engagement with the rack of the car.- ing -device, the preliminary grippers, .oscilriage 4 which is reciprocated from the crank latably mounted on the axle .of the cylinder, 2 through the intermediary of the gear wheel grip the laid-on sheet and convey the same to 3. The impression cylinder a, during the the impression cylinder-grippers. When "rearwardtravel of the carriage 4, is held by these latter grippers have gripped the sheet, the forked member 7 which engages a roller the preliminary grippers open and release the 8 on the impression cylinder and which is sheet. The impression-cylinder conveys the given an intermittent motion through the sheet to the printingand rolls it towards the connecting link 6 from the usual double eccrank 2 turns through the dotted circle shown, its connecting rod 2 pulls the gear wheel 3 back and forth from a position to the right to the dotted line position shown at the leftin Fig. 3,. and back again. During this, the gear wheel 3 moves on the fixed rack 3' and thereby advances thechase or type carriage 4 from the position shown in full lines to that shown in dotted lines, and back again: the travel of the carriage 4 being twice that of the gear 3.

The carriage 4 has a rack 4 on its upper surface, to mesh with gear teeth on the printing cylinder a: these teeth, however, are omitted for a portion of the cylinder periphery so that the carriage 4 may pass the cylinder without operation thereon when this part of the cylinder is presented to the carriage 4. \Vhen the carriage 4 travels from the dotted left hand position shown in Fig. 3 toward the right, the gear teeth of the cylinder mesh with the rack teeth of carriage 4.and the cylinder is operated for the printin Durin the return movement of the carriage 4 from the right hand position back into the dotted left hand position, however,

the mutilated portion of the cylinder at is for this purpose is effected by the cooperation of the double cam 5 with the rollers on the connecting rod 6, whereby the connecting rod 6 is held in the central position, with the lever 7 upright as shown in Fig. 3. During the leftward movement of the carriage 4, the double cam 5 presents its concentric portions to the rollers on connectingrod 6, so that the lever 7 remains in the position shown. hen the carriage 4 reaches the left hand position, the double cam 5 presses itsraised portion against the rollers on the connecting rod 6, so that the lever 7 is moved to operate through the roller 8 to give a small rotation to the cylinder (1, so that as the carriage 4 begins its movement toward the right, the rack 4 thereof engages the teeth on the cylinder a and causes a rotation of the latter for a complete revolution, and until the carriage 4 has reached its right hand position. At this point, the double cam. 5 again operates the lever 7 so that the lever is again ready. to receive the roller 8, and does so receive this roller and move the cylinder delinitely to the position shown in Fig. 3 at the beginning of the next leftward movement of the carriage '4. This operation continues in the samemanner. This portion of the construction is-well known and is used in all half cylinder high speed printing presses.

On thestationary laying-on table I) the sheetcl to be printed is positioned-against the locating or'justifying devices 0.

The timed opening and closing of these cating devices 0 is effected by means of a connecting rod-and-link system 41, 42, 43, 44, 45, of which the roller 46 is held by a tension spring 47 against an eccentric 48 which is keyedto the shaft 1 (best shown in Fig.

r The swinging arms 9 are loosely mounted on the spindle of the impression roller a and are cont-rolled by a pair of toothed segments h which engage with a further pair of toothed segments 2' mounted on a shaft 76.

This shaft is is operated through the rod 9 and the lever 10 carrying the roller 11 which travels in a continuous guideway 12 secured to the shaft 1. The swinging arms 5 carry on radially adjustable members 2 a rotatable spindle or tube f, to whic'hare secured the preliminary grippers e. The spindle f is rotated by means of roller carrying arms 13 in cooperation with springs 14 which tend to press the preliminary gripperse against a series of contacts'15 rigidly secured to the members 2. The roller arms 13 derive their motion from the sectors 16 which are freely mounted on the spindle supports of the cylinder and are furnished with oblique faces 17 and 18 above and below on which the rollers of levers 13 run. The sectors 16 are controlled by the rod 19 and link 20, which latter is keyed to the through shaft 21. This is oscillated by means of the link system 22, 23, 24, whichis operated by means of a roller engaging in a continuous guide groove secured to the shaft 1. For the sake of clearness this guide groove is shown separately in Fig. 3. The radially adjustable members 2 on the swinging arms 9 are provided on their inner faces with rollers 26 which are urged by springs 27 against the inner guide surfaces of the sector arms 16. These inner surfaces are concentric with the cylinder at except for a short swell at their lower ends. The preliminary gripper system 9, 2,), e, 15 thus swings for the greater part concentrically with the cylinder a and at a determined distance therefrom. However, at the position in which the sheet is to be transferred to the impression cylinder. grippers, the swell 28 causes the preliminary gripping system to approach the cylinder.

The impression cylinder grippers: Z are operated in known manner through the medium of a lever 29 carrying a' roller which is held by a spring 30 against an eccentric 31 freely mounted on the axis ofthe cylinder. A simple method of effecting the required displacement of the eccentric 31 is illustrated in Fig. 3 where the system comprising link 32, bell crank 33, spring 34 and cam surface 35 carried by the carriage 4, is provided. A stop 36' serves to retain the eccentric 31 in its position of rest. It is obvious that other known arra g m nts f r ffe i g uch outer end of thetoothed sector 2'.

the sheet d in its grippers e.

' messes motion may: besubstituted forthe simple system here described' The sheet passes in known manner between the rollers 40 and n which guide it to the delivery table.

Theco-operation of the described components, in accordance with the invention, is as follows 1 I In Fig. 3 the carriage 4 is shown in its extreme position to the right; it commences its return travel to the left, during which no printing occurs and the impression cylinder a also remains in its rest position. The pre liminary gripper system, which is inits uppermost position adjacent the preliminary.

locating devices 0, has gripped the edge of 7 Through the action of the eccentric 48 the locating devices 0 are now lifted." The swinging arms g-together with the preliminary gripper system begin their downward travel, due to the contour of the guide groove 12 carried by the shaft-.1. After this system has passed,'fthe ejecting guide tongues m sink into their operative position consequent to the roller 36 running off the segmental member 38. Also the preliminary locating devices 0 are brought 7 into their active position after the passage ofthe rear-end of the sheet-through the cor-.

responding. co-operation of the eccentric 48 and the rodand link-system, sothat the next sheet can be laid on immediately. Fig. 4 showsthe preliminary grippersystem and sheet during the downward travel, up to the point where the roller 26 engages with the corresponding swell 28 on the inner guide of the cylinder; the edge of the sheet is'there surface of the sectors 16. In this manner the members a are urged towards the centre by pressed againstthe outer surface -of the cylinder (as shown in full lines in Fig. 4).

. 'In this position the roller of the lever 13 of the preliminary gripper syste'mis practically contacting with the'projection 18 on the sector 16, without engaging it however. The

' cylinder grippers Z'now-close as during the return motion of the carriage 4. The eccentric 31 controlling the grippers is operated I through the cam surface 35. 7 Then, in consequence of a sharp reentrant P in the rotating guide groove 25 (Fig. 3), a sudden jerky up-' ward motion is given to the sectors 16 whereing of the grippers .e the roller 11 traverses the-portion R, of the guide groove 12, so that t winging rm 9 exe ute a sma l t ar mO iu' In hi manne t np n d pr i r inary grippers e are removed from the edge t' t e Sh et, so that elatt s ac p a y freed therefrom. Simultaneously the preliurinary grippers are again closed bythe roller of lever 24 engaging the portion Q of the by h pr limina y ppe -s .-a rased bathe ac ion-9i the P ojection h '-v-a edge o th sh t i n h ldby cy i :rfiler grippers ,Z only Directly after the open-' guide groove 25, which causes a rotation of the sectors 16 .d-isengages the projection 18' f m heroll r of l ve 13- A e sam 61 time the tulle-. 2 leave h w ll 2. ath nner surfaces of sectors 16, whereby the member :2 t g t er with he p el mi a y. grippers c are displaced outwardly relatively to the cylinder, so as not to hinder the pas-- sageof the sheet to printing position (Fig. ,5). During the operations described the carr age 4 has reached the end'of its return iliwtel (indicated in dotted lines, Fig. and 1 .cOilllmences the printing stroke ,(to the right, Fig.3), The impressioncy-linder, controlled .by-the motion ofthe forked member 7 ,com-

meme .to turn in the direction of the arrow and comes nto toothed engagement with the prin ng; he p m na y gr pper ys em again swings upwards, but so slowlythat the Vcarriage ty printing then occurs. During ejector guide tongues do-not need to be rai ed un l aftert le p nted Shee s been lected. Dur ng. this motion the closed preliniinary grippers are spaced from v the sun face ofthe impression cylinder by the same amount as during their downward motion. After the tonguesm have been liftedjthe preliminary gripper system passes on to the.

locating devices 0 where it remains station ary. During the last portion of the upward travel, the preliminary grippers are re-opened through the displacement of the lever'l3 dueto its roller encountering the upper project ons 17 of the pair of sectors 16, In the meantime the next sheet has been placed in rosition against the locating devices 0, and

directly after the preliminary gripper system has reached its upper position the grippers are closed by the release of the rollers carried by lever 13 from projections 17 on the sectors 16 consequent to a short upward motion of the sectors due tothe contour of the guide groove 25 at the position S. Meanwhilethe' carriage 4 has reached the end of its printing stroke (shown in full lines in 3) and the I working cycle as described is started afresh. 4

Having nowparticularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I- declare that whatI claim is a 1. A stop-cylinder printing machine with sheet delivery at the front, in which the impression cylinder grippers are, during the stop of the impression cylinder, in proximity to the bed, comprising in combination with the laying on table and with the gripper on the impression cylinder, oscillatable prelimi- V nary grippers-for conveying during the stopping of the impression cylinder the sheet to be printed from the laying on table to the impression cylinder-grippers.

2. A stop-cylinder printing machine with sheet delivery at the front, in which the impression cylinder grippers are, during the stop of the impression cylinder, in proximity to the bed, comprising in combination with the laying on table and with the grippers on the impression cylinder, preliminarygrippers os'cillatably mounted on the axis of the impression cylinder'for conveying during the stopping of the impression cylinder the sheet to be printed from the laying on table to the impression cylinder-grippers.

3. A stop-cylinder printing machine with sheet delivery at the front, in which the impression cylinder grippers are, during the stop of the impression cylinder, in proximity to the bed, comprising in combination with the laying on table and with the grippers on the impression cylinder, oscillatable preliminary grippers for conveying duringthe stopping of the impression cylinder the sheet to be printed from the laying on table'to the impression cylinder-grippers, toothed segments one on each-oscillatably preliminary gripper, a shaft rotatably journaled at the outer side of said impression cylinder, and toothed segments on said shaft meshing with said toothed segments on said oscillatable preliminary grippers.

In testimony whereof I have afixed my sig- 7 nature. 1

' ALBERT NEUMANN.

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