US2262470A - Inking device of flat bed cylinder printing machines - Google Patents

Description

.A. SCHLESINGER Nov. 11, 1941.

INKING DEVICE OF FLAT BED CYLINDER PRINTING MACHINES Filed Dec. 10, 1938 3 Sheets-Sheet 1 ATTORNEY W 1* Ndv. 1 1 ,--l 941. A. SCHLESINGER INKING DEVICE OF FLAT BED CYLINDER PRINTiNG MACHINES Filed Dec. 10, 1958 3 Sheets-Sheet 2 v INVENTOR ATTORNEY Nov. 11, 1941.

' A. SCHLESINGER INK ING DEVICE OF FLAT BED CYLINDER PRINTING MACHINES I 3 Sheets-Sheet 3 Filed Dec. 10, 1938 W ATTDRIVE) Patented Nov. 11, 1941 QINKING nEvioE oF FLATBEfiQYLINDER PRINTING MAQHINES t a H Alfred Schlesinger, m n e-airsp c n land Applieation December '16, 19ss, sna1, vd; 245,046" i In Great Britain December/13, 193"? y 14 cla m (01. 1oi 356),

i The; present invention relatesto the inking idevices I of flat-bedl cylinder printing machines of the two-revolution type uandof the Wharfedale, or. stop-cylinder type in which. the sheetis fed, v and delivered, at opposite ends of themachine.

In. general in these machines the ink is taken moves with the reciprocating bed first I under distributing rollers which-spread the ink over the wholeor a lar'gelsurface of the slab and then carry roundebetween them an isolated'supply of from a duct roller oroylindeno'nto a slab which" v he im o ,o c cting or s stating, iforme-engaging rollers they supply, are driven insuch a mannerthat their circumferential surfaces run inrunison with the type bed; butln addition, rollers maybe provided, preferably-,in different sets or 1 pairs, which serve to ing distribution but also of frictionally heating under rollers which take'off'the ink directly from the slab and deliver it to the printing forme. 'Ihe main' object of the present invention is to pher'eand dust'and dirt" is unduly liable tosettle thereon.

ding to the j present" invention the ma chine comprises one or moreink receiving rollers Iprior to-beingtransferredcfromsuch rollers to i the inking rollers or; to the distributors which rotate in co-ordination with the f orm'e-engaging rollers; and type bed. Where-the ink isso treated, @JnQIjB viscous ink thanusual may be employed.

'Ihese1'ink-Working rollers may berun at comparatively high speed in relation: to the speed of arranged to travel with the bed andto carjry the inkfdelivered from the duct rollerjalong'the ma" ehi'ne without "distributing'the ink over -a "slabf enact deliver it directly, or through intermediate means, to rollers which supply the forme engagmg rollersand which distribute theink beforeit is supplied tosucliflform'efengaging rollers The ink may be delivered to the travellingroller froinf 5 the duct rollen-by a swinging roll-er; The distribute-r rollers preferably form with the forme-j engaging rollers a pyramidal series, and by means:

of this invention the; stripe can be transferred to"theupperrnost ro11er of the seriesso, that their ink crinnotreaohtheiorme until it has been well distributed through the series oflrollersfl The trayellingfinkwoller may be lb 'nught at the appropriate time into contact with .th-e ldistributors, e. g., byswingingup tofthe distributor rol1ers,-or one "or more "separate transferiollers may be interpdsed ,betweenithe rbllencarried by the bed and 'the distributonrollers and be moV- able at the appropriate time iniorder to 'eliect theltransfer. M- g Preferably Ireplaceflthe slab bytwoor more rollers which move with the bed andl arrange 'fOIf ink to be delivered to one or more of them from the duct 1 roller, these travellingrollers act- ,inglon the ink andedistributing the-inkjover their,

surfaces whilst thebed isi making; the advance stroke during, whichprinting takes place; The ink is transferred from. such rollers to the distributor rollers; e. .g., by one or more of-the rollers movingwiththe bed coming into contact with the distributor r0l1ers,-'e. g bysWinging-up Provision maybe-made for eli'ectinga preliminary=distribution orworking up oi the ink on co-operating frollersqat the ductqend of the ma chineand such means may be used for distributingithe ink over the surfacejof the travelling be arranged at orp'near, the rear edge formeecarrying partofcthe bed, i ":In-order 'thatth'e invention maybe the more readily understood, reference is made to 0011-,

structional forms, thereofjillustrated by Way of outlines and Fig. 2 isA-a longitudinal section thr-oughthelupper part of Fig. 1 showing various parts omittedin ordertoillustrate clearlythe arrangement ,of the rollers according to the invention; In this form of 'the apparatus two travelling rollers are provided. Fig. 3 isa detail view I ofthe mounting of the? upper travelling rollers;

, Fig. 4 shows diagrammatically an alternative formof the invention in which theiinkis carried along the machine on a' single'rollerm Fig. 5

isqa detail View of: a further modification. Fig;

6qisa; detail View of a modified devicefor supplying'a travelling roller and Fig.-7 shows anotheri'means- -of supplying ink to the travelling v the vibrator IO1112 on to the roller 28 The duct roller-may be driven intermittently and the ex tent; of rotation' may be varied by Well-known mea'nsyto regulate the width of the stripe or band which is received by thevibrator roller The vibrator is-"freely rotatable uponthe arms or will serve in order that the ink may be transferred to the The printing cylinder 5 is arranged roller 28. medially of the machine as is usual in two-revolution machines and in that class of stop-cylinder machine in which the feed is at one end of the machine and delivery at the other. The drawings illustrate diagrammatically the feed table 6 and the delivery device I. The latter may take the form of endless tapes. The feeding and delivering means may be of the usual forms to be found in machinesof the kind just referred to, and as these means form no part of the present invention, they will not be described in detail herein. The arrangement of the delivery device ordinarily makes it impracticable or inconv'enl entto arrange a system of distributors in close vicinity to the cylinder and with a duct adjacent to the upper distributor, but in accordance with this invention the ink delivered on to the roller 28 from the duct, which may be kept at one end of the machine as shown, is carried along towards the cylinder upon the roller, but the roller, instead of delivering the ink on to the rollers 8 which engage the forme I la is arranged to stop short of the said rollers at the position indicated in dotted lines in the drawings. Upon the forme-engaging rollers 8 I mount a series of distributor rollers 8 forming with the rollers 8 a pyramidal system.

In the form shown the ink is not delivered directly on to the uppermost roller of the pyramidal series, but a system of rollers is introduced between the travellingrollers and the uppermost roller 20 of the pyramid which have the effect of working-up the ink and frictionally heating it prior to its being transferred to the pyramid. These rollers include two sets II, I2 of rollers, each set in the form illustrated consisting of three rollers and they are mounted on a carrier I3 which rocks about the axis I4. Each set of three may comprise a steel roller I5, I5a and two hard rubber rollers I6, IEa, I1, I la and the sets are arranged alternately to contact with a positively driven steel roller I8. The rollers may be of smaller diameter than the distributors to facilitate the repeated passage of the ink between the co-operating rollers.

The drawings show the roller I5a in contact with the roller 29 and following the next or after twoor more printing operations the system of rollers I5 to Ila rocks so that the steel roller I5 will be brought into contact with the travelling roller 29 at the appropriate time and simultaneously the rubber roller I! of the set which has been in running contact with the fixed geared roller I8 is drawn away from such roller whilst the rubber roller IIa of the other set is brought into contact therewith. A vibrator I9 rodks between the geared roller I8 and the uppermost roller 20 of the pyramidal series of distributors, running in contact first with the roller I8 and then with the roller 20. This arrangement permits of the ink being well worked up and frictionally heated to assist in bringing it to good printing consistency, the provision of two sets of ink-working rollers being advantageous as an isolated quantity of ink can be kept on one set fo-r'alonger period of time than if a single set were employed. The provision of these inkworking rollers enables the machine more readily to deal wtih the highly viscous inks.

I engagement with the fixed roller I8.

The pyramidal series of rollers may include, in addition to the upper steel roller 20, positively driven steel rollers 2I and two intermediate composition rollers 22, the lower steel rollers supplying the forme engaging rollers 8. More distributing rollers could be included where space permits or other arrangements of the distributing rollers could be employed. The distributing rollers 20 to 22 will be run in unison with the forme-engaging rollers 8 at the speed of the type bed.

The ink is thereafter carried through the distributors 20 to 22 to the rollers 8.

The roller 28 of the pair which travel with the bed is geared by a pinion 25 to a fixed rack 26 on the machine frame. A strip or band of ink is delivered to the lower roller 23 from the duct roller I by means of vibrator 2. The travelling roller 28 is positively driven from the rack 26, this roller being conveniently a steel roller and frictionally driving the roller 29 which is preferably of composition. These two rollers act on th ink whilst the bed is travelling'and distribute the ink over their surfaces. The composition roller in this; way receives a distributed charge of ink and the roller is itself rocked at the appropriate time during the travel of the bed about its pivot 30 for transferring the ink thereon to the rollers I5; I5a;

Fig. 1 shows the details of construction and operation of the machine. tributors 9- is derived from a rack I00 travelling with the bed I'Illand forme Ila, the two steel rollers 2| being positively driven by pinion wheels I02, I83 from the rack so that all the rollers 9 run at the surface speed of the bed. The rollers I5 to Ila however which rotate at a considerably higher surface speed are driven from the high speed shaft I04, itself driven from the shaft I05 of the machine through a chain I06. The drive from the shaft I04 isthrough chain I 01 t0 the fixed shaftI08 carrying a spur wheel I09 which is engaged by spur wheels III], II I on the steel rollers I5, I5a. The rocking carrier I3 is attached to a link H 2 connected through rod II2a to a lever II 2b which has a roller H20 engaged by a cam II3 having a high portion II4 which turns the carrier against the force of spring H5 in order to bring the rollers I5a, IGa, Ila into The cam shaft I I6 is driven by chain drive II! from shaft I-I8 which is driven through gearing II 9, I20, I2I, I22 from the main shaft I05.

The fixed roller I8 carries a pinion I23 which gears with pinion I89. Ink is supplied from the fixed roller I8 to the upper distributor roller 20 by a vibrator roller I 9 the arm carrying which is connected to a lever I23 by a link I24, this lever carrying a roller I26 tracking a cam I21 by which the lever I23 is periodically rocked to rock the vibrator I9. The shaft I21 of the cam I25 is driven by chain drive I28 from shaft II 8. The link I24 is returned by spring I29.

The means for reciprocating the bed IOI carrying the forme may be as is usually employed in the class of machines above referred to. For

example, a common method of reciprocating the bed in a two-revolution press of commercial form comprises a pair of racks I30, I3I carried by the bed and engaged in turn by a spur wheel I32,

e the spur wheel shifting at the end of each stroke in order to be disengaged from one rack and engaged with the other. In the form shown the continuously rotating spur wheel I32 is mounted in a frame. I33 which has a small vertical movement which allows the wheel to engage alternate- The drive for the disly with the top and bottom rack, the frame carrying a depending arm I34 at the end' of which is a roller I36 which works in a cam I mounted on the shaft I I8.

The roller 29 (see Figs. 1 and 3) is carried by a lever I31 the rear of which is provided with a roller I38 which engages a fixed cam I39 so as to rock the. roller 29 into engagement with roller I5 or [5:1 and the bearing I40 for theaxle 30 of the lever may be yieldingly held by a spring MI in a recess in the bed so as to allow the bed to continue itsmovement while the roller 29 dwells in inking contact with the roller I5 or I511.

The arm 4 is yieldingly connected through spring I42 to the lever I43sothat when engaged by the travelling roller 28 the arm 4 rocks about itspivotal connection I44 to the lever I43 against the force of the spring I42 so that the vibrator roller dwells in contact with the travelling roller for a sufficient length of time. 'The means for rocking the arm 4 and the means for periodically turning the ductor roller I may be of any usual well-known type found in commercial two-revolution or stop cylinder machines. For example, the arm I43 carries the arm I44a which is slotted adjustably to receive the pin I45 of a long link I46 connected to a lever I4I carrying a roller I48 which is tracked by a cam I49 mounted on the shaft H8. The pawl I50 which operates the ratchet I5I of. the duct roller iscarried by a lever I52 pivoted at [53 to a two arm lever I54 pivoted at I55 to the frame and pivoted at I56 to a long link I5'I whose other end is pivoted to a lever I58 carrying a rollerv I59 which tracks the cam ISIImounted on the cam shaft I I8.

In the variant form shown in Fig. 3 a single roller 24 is carried by the bed in lieu of a plurality of rollers as in the first form described and a composition vibrator 21 is provided which is brought into contact with the roller 24 during the travel of the latter and is frictionally driven in contact therewith for a sufficient time to take off the necessary quantity of ink. In this form' as in the first form described the ink need not be delivered directly by the vibrator 21 to the upperrnostroller of the pyramidal series but a system of rollers II, I2 may be introduced for working up the ink. The transfer roller 21 is arranged to be moved at the appropriate time into contactwithroller 24, e. g., at the position A while the roller 24 is travelling and leaving roller 24 before the latter reaches position B.

The ink need not be passed through intermediate ink working rollers prior to passing to the distributors. It can be transferred from the roller 24 to the first distributor roller 20 in various ways. A form which avoids the use of long arms for carrying the vibrator roller is shownin Fig. 5 in which there is provided an intermediate geared roller IBI which receives ink from the roller 24, a vibrator roller I62 taking theink from the geared roller to the distributor 20. The roller 24 is ina bearing I63 which is slidable in a recess in the forme bed against the pressure of a spring I 64. The vibratorI5I is actuated by a link I65 similarly to the vibrator I9 (Fig.1). A

One or more of the rollers which travel with the bed may be freely rotatable atleast when they are at the duct end of their travel and arranged to be driven when the bed is at or near the endof its movement in the direction of the ink duct. This is preferably effected by interposing (seeFigsjS and 7,) rollers 40, M which transmit frictional drive to the bed roller 39 and which are driven, e. g. from a "suitable 'chain drive 42. These rollers (hereinafter termed the driven rollers) may be rotated continuously or rotated only when the bed roller or rollers are approaching them and whilst contact between the driven rollers and the bed rollers is required. One positively driven roller 40 can as shown drive the other or others by friction.

The driven rollers may be arranged to move e. g., to rock and maintain contact with the bed rollers for a suflicientlengthof time whilst the bed is travelling (see Fig. 6).. Alternatively the bed roller could be under the control of a spring 43 so as to keep them in contact with stationary driven rollers for the necessary time (see Fig. '7)

By driving the bed roller in the way above described the ink is well distributed over thesurface of the roller inspite of the fact that the bed roller need not rotate during the travel of the bed.

.Cam means for operating the vibrator rollers are not illustrated as suchmeans are well known in the art, as also are the means for reciprocating and guiding the bed.

I claim: i

1. Inking apparatus for a fiat bed cylinder printing machine comprising a reciprocating bed, a printing forme carried thereby. an ink duct, forme-engaging rollers arranged to make inking contact with said forme as the bed travels, distributing rollers arranged in inksupplying relation to said formeenga'ging rollers, means fo'r carrying. ink from said, duct to said distributing rollers, said means including at least one roller carried by said bed and travelling therewith between saidduct and saiddistributing rollers,

2. Inking apparatus for a flat bed cylinder printing machine comprising a reciprocating bed, a printing forme carried thereby; an ink duct, forme-engaging rollers arranged to make inking contact with said forme while the bed travels, distributing rollers arranged in inksupplying relation to said forme-engaging rollersfmeans for carrying ink from said duct to said distributing rollers, said means including a plurality of rollershcarried by said bed, means for rotating said travelling rollers in cooperation whilst they are travelling with thebed in order to distribute the ink over their surfaces.

3. Inking apparatus of a flat bed printing machine comprising a reciprocating bed, a printing forme carried thereby, an ink duct, a series of rollers, said series including forme-engaging rollers arranged to" make inking'contact with said forme as the bed travels, said series of rollers including rollers adapted .frictionally to work ink before its transfer to said forme-engaging rollers, means for effecting such transfer, at least one roller carried by said bed and travelling therewith, means for operativelyrelating a said travelling roller in ink-transfer ring relation tosaid ink-working rollers during apredetermihed part of the travel of said bed and means for maintaining at least some of said ink working rollers temporarily out of inking engagement with said forme-engaging rollers during a period of working up of the ink.

4. Inking apparatus of a flat bed cylinder printing machine comprising a reciprocating bed, a printing forme carried thereby, an ink duct, forme-engaging rollers arranged to make inking contact with said forme as it reciprocates, and ink distributing rollers rotatablecontinuously in inking relation with said formeengaging rollers, a plurality of sets of preliminary distributing. rollers, means for conveying ink from said duct to said latter rollers, said means including. at least one roller mounted to reciprocat'e with said bed, said sets of preliminary distributing rollers being operative in turn temporarily to isolate from said first distributing rollers and frictionally to work a charge of ink received from said travelling roller and then to supply said first distributing rollers with previously isolated and worked ink.

5. Inking apparatus for a flat bed cylinder printing machine comprising a reciprocating bed, a printing forme carried thereby, an ink duct, forme-engaging rollers arranged to make inking contact with said forme as it travels, distributing rollers arranged in ink-supplying relation to said forme-engaging rollers, means for carrying ink from said duct to said distributing rollers, said means including a plurality of rollers carried by said bed and travelling therewith, means for rotating said travelling rollers in co-operation while they move with the bed and means for separating said rollers and bringing at least one of said rollers into inktransferring engagement with said distributing rollers during a predetermined part of the travel of said bed.

6. Inking apparatus for a flat bed cylinder printing machine comprising a reciprocating bed, a printing forme carried thereby, an ink duct, forme-engaging rollers arranged to make inking contact with said forme as it travels, distributing rollers arranged in continuous inksupplying engagement with said forme-engaging rollers, and forming therewith a pyramidal series, means for carrying ink from said duct to the uppermost roller of said distributing rollers, said means including at least one roller carried by said bed.

7. Inking apparatus for a flat bed cylinder printing machine comprising a reciprocating bed, a printing forme carried thereby, an ink duct, forme-engaging rollers arranged to make inking contact with said forme as it travels, distributing rollers arranged in ink-supplying relation to said forme-engaging rollers, means for carrying ink from said duct to said distributing rollers, said means including a plurality of rollers carried by said bed, means for positively driving at least one of said latter rollers whilst it is travelling and at least one other of said rollers being mounted so as to be frictionally driven by said positively driven roller and means for separating said travelling rollers and bringing said frictionally driven roller into inking contact with said distributing rollers during a predetermined part of the travel of the bed.

8. Inking apparatus for a flat bed cylinder printing machine comprising a reciprocating bed, a printing forme carried thereby, an ink duct, forme-engaging rollers arranged to make inking. contact with said forme as it travels, distributing rollers arranged in ink-supplying relation to said forme-engaging rollers, means for carrying ink from said duct to said distributing rollers, said means including a plurality of rollers carried by said bed, a pinion attached to one of said rollers, a fixed rack, said pinion being arranged to gear with said rack as the bed travels thereby to rotate said roller, at least one other travelling roller being in frictional driving relation to said positively driven roller and serving as an ink-transfer roller.

9. An inking, apparatus as in claim 1, comprising a ductor roller, means for rocking said roller between said duct and a said travelling roller. means resiliently mounting said ductor roller so that it yields to the pressure of the travelling roller and maintains contact therewith during a predetremined part of the travel of the bed.

10. Inking apparatus according to claim 1, comprising means resiliently mounting a said travelling roller for a limited relative movement with respect to the bed, said travelling roller being arranged to contact said distributor rollers during a part of the travel of the bed during which said relative movement occurs to provide a prolonged dwell between said travelling roller and said distributors whilst the bed is still travelling.

11. Inking apparatus of a cylinder printing machine according to claim 2, comprising a roller for charging with fresh ink at least one of said travelling rollers and another roller for taking off ink from at least one of said travelling rollers, means for maintaining said charging roller and its co-operating travelling roller in. contact during a part of the travel of the latter to enable it to take up a sufiicienoy of ink and means to maintain said take-off roller and its co-operating travelling roller in contact during a part of the travel of the (Bo-operating travelling roller to enable said take-off roller to receive a sufiiciency of ink.

12. Inking apparatus of a flat bed cylinder printing machine comprising a reciprocating bed, a printing forme carried thereby, an ink duct, forme-engaging rollers arranged to make inking contact with said forme as it reciprocates and ink distributing rollers rotatable continuously in inking relation with said forms-engaging rollers, means for rotating said forme and distributing rollers, a plurality of sets of preliminary distributing and ink-working rollers interposed between said first distributing rollers and said duct, means for rotating said preliminary distributing rollers at a considerably greater peripheral speed than that of said first distributing rollers, means for conveying ink from said duct to said preliminary distributing rollers, said means including at least one roller mounted to reciprocate with said bed, said sets of preliminary distributing rollers being operative in turn temporarily to isolat from said first distributing rollers and frictionally to work a charge of ink received from said travelling roller and then to supply said first distributing rollers with previously isolated and worked ink.

13. Inking apparatus for a flat bed cylinder printing machine comprising a reciprocating bed, a printing forme carried thereby, an ink duct, forme-engaging rollers arranged to make inking contact with said forme as it travels, distributing rollers arranged in ink-supplying relation to said forme-engaging rollers, means for carrying ink from said duct to said distributing rollers, said means including at least one roller carried by said bed, a roller movable between said travelling roller and the duct, means for driving said movable roller and means mounting said travelling I roller so that it is frictionally driven by said movable roller when the bed is travelling nearest to the duct.

14. A printing machine according to claim 13, comprising two or more rollers between the duct and the travelling roller which effect a preliminary distribution of the ink.

ALFRED SCl-ILESINGER.

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