US2262549A - Printing press - Google Patents

Description

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Among the features of my invention is Patented Nov. 11,1941

Columbian Bank of Illinois Note Company, a corporation Application April 28,1939, Serial No. 270,635

18 Claims.

This invention relates to improvements in printing presses and more especially a power printing pressespecially adapted for taking impressions from etched or engraved plates, and for intaglio work in general. the provision of means for wiping the plate with wiping material over a. wiper roller rotated coung ter tothe direction of movement of the plate during the wiping operation; thus avoiding the I the press with the feed table removed; Fig. 4

is a top plan view of the delivery end of the press; Fig. 5 is a view taken as indicated bythe line 5 of Fig. 3; Fig. 6 is a view taken as indicated by the line 6 of Fig. 4; Fig. 7 -is a view taken as indicated by the line 1 of Fig. 3; Fig. 8 is a view taken as indicated by the line B of Fig. 3; Fig. 9 is a similar view showing the parts *inanotheiposition; Fig. 10 is aview takenas accumulation of ink in front of the wiping face i and the resultant objectionable unevenness in ink;- removal heretofore encountered in presses ofthissort. j

Another feature of myai'nvention is the pro visionof means for employing the same wiper fecting a savinginthe cost of operation.

Another feature of my inventionis the pro vision of means whereby the same portion of the wiper cloth first usedfor polishing, is then used forwiping, thus effecting a saving in the cost of material and operation. l Another feature of my invention is increased simplicity in construction and operation with respect tothe plate travel and impression roller oscillations, for performing the various printing operations, whereby the length of travel-of the plate and. therefore the overall length of the press has been considerably shortened. This has been accomplished byperforming the wiping and polishing operations in immediate succession at one end of the plate travelas the plate leaves and returns to its position under the impression roller. During the latter part of each return movement of the plate it isinked; and during the latter part of each forward movement it is wiped. During the forward movement theimpression roller receives the paper. Duringthe return movement lthe'plate is Ifirst polished andthen indicated by the line in of Fig. 3; Fig. 11 is a view takenasindicated by the line ll of Fig. 10; Fig. 12 is a view taken as indicated by the line l2 of Fig. 1; Fig. 13 is a view in side elevation of the wiper rollerjogging mechanism;Fig. 14 is a view taken as indicated by the line ll of Fig.

1 13; Fig. 15 is a view taken as indicated by the .cloth'for both wiping and polishing, thus efline I 5of Fig.13; Fig. 16 is a view taken asindicated by the line l6 of Fig. 15; Fig. 17 is a view taken as'indicated bythe line I! of Fig. 18; Fig. 18 is a' view taken as indicated by the line l8 of Fig. 13; Fig. 19 is a view taken as indicated by the line IQ of Fig. 18; Fig..20 is a view] taken as indicated by the line 20 of Fig. 1; and Figs. 21 and 22' are diagrammatic views showing the sequence of operations.

A general description of the construction and operation of the press will be helpful before pro-.

ceeding to a more detailed discussion. For this purpose attention is directed to Figs. 21 and 22. As here shown, ID indicates the press bed or plate carrier carrying the plate H. I2 is the inking rollerj l3 indicates the impression roller;

I4 the wiping and polishing roller, having over it a strip of material I5 for wiping and polishing suchas, forjexample, paper, cloth orthe like.

l6 indicates the feed table at the. receiving end of the press upon which the paper is placed preparatoryto its being removedby the impression roller for the printing operation.

pression roller delivers the paper. All theseop erations areaccomplished by continuous reciprog cations of the plate synchronized with continuous smooth, rapid andeflicient operation. 1

oscillations of the; impression roller thus giving Other features and advantages of my invention will appear more fully as I proceed with myspecification. r H H Inthat formof device embodying thefeatures of my invention, shown I in the accompanying drawings-Jig. 1 is a'view hi side elevation; 2 is c a similar view showing the opposite side;

and rotates counterclockwise, which may be referred to as its return movement. During the Fig: 3 is a top planview" of the receiving end of forward movement of the plate, the inking roller |2,which.has]already inked the plate during the last part of :the preceding return stroke, is out of contact with the plate and in contact with the ink supply mechanism. During the latter part of the forward movement the plate is wiped by the roller I 4. During the return movement (from right to left) of the plate, the impression roller I3 rotates in a clockwise direction to take the impression from the plate, and after the plate leaves the roller, the latter continues far enough to deliver the printed sheet to the delivery conveyor Il at the delivery end of the press. During this return movement of the plate, it is first polished by the roller I4, the impression is taken, and the ink roller I2 is dropped so that the plate is inked as it returns to the starting point.

Plate carrier and its operating mechanism The plate carrier I is mounted for reciprocation on the supporting rollers 29, carried on the bed 2|. At the center of the press, under the impression roller, is a supporting roller 23 extendingentirely across the press, which in turn is supported on the rollers 25, 24 carried on the frame member 25, This roller 23 is very heavy and rigid, and being located directly under the impression cylinder, gives firm and 'solid' support to the plate carrier directly under the point of contact wherethe impression is taken. At each side the plate Ill is provided with a rack bar 25, engaged by teeth 2'! at the .ends of the roller 23.

are engaged by teeth 28 on the gears 29, and teeth 39 on the gears 3I. That is, the gears 29 are at the receiving end of the press and serve to move the plate carrier at the commencement of its forward movement. After leaving the teeth 28, the plate carrier is engaged by the teeth 2! onthe roller 23 and after leaving these, the forward movement of the plate carrier is completed by means of the teeth 30 on the gears 3i.

' The following means areprovided for oscillatingthe roller 23 and the gears 29 and 3| in order to reciprocate the plate'carrie'r. 3'2 indicates a driven wheel onthe transverse shaft'33 carrying a pinion 34, driving thelgear on a shaft 36 which, in turn, by means of the pinion 3! drives a large gear 38 on the crank shaft 39. The crank shaft 39, by means of the crank 49 and connecting rod 4I, oscillates the toothed seg- This'segment, by means of the pinion 44, oscillates the transverse roller ment 42 pivoted at 43.

23 above described. The gears 29 and 39 are oscillated from this roller through intermediate pinions as follows. The roller 23 carries the gear wheel 45, driving thegear46 which, in turn, drives the shaft 41 (on which the pinions 29, 29 are mounted) by means of the gear 48. Likewise, at the other end of the press, the gear drives the gear 49 which, in turn, drives the gear 50 on the shaft 5| which carries the gears 3 I, 3|.

Impression cylinder and its operating mechanism The impression cylinder I3 is mounted on a shaft'54, the ends of which are journaled in the journal blocks 55, slidably mounted for vertical At each end, the cylinder is At the ends of the travel of the plate carrier, the'teeth 26, after they leave the teeth '21,

tions of the plate carrier I0 serve to oscillate the impression cylinder I3. The engagement of the teeth on the rack bar 58 with the teeth on the gears 51 is sufficiently deep so that they will remain meshed, and the oscillations of the cylinder I3 will continue even when the cylinder is slightly raised, as will be described hereinafter.

As has been stated before, the impression cylinder is in its raised position, or out of contact with the plate, during the forward movement of the plate. During the return movement, it is in its lower position to take the impression. The vertical movements of the impression cylinder are accomplished in the following manner.

The transverse shaft 3'6, through the bevel gears 69 and GI, drives a longitudinal shaft 62 which, in turn; through the bevel gears 63 and 64, drives a transverse shaft 65 carrying the cam wheel 66 with the cam groove Bl embracing the cam roller 68 on the bell crank 69 pivoted at 69a.

The bell crank 69, through the connecting rod I0, oscillates the bell crank I I, pivoted at 72, carrying the vertical rod I3, the upper end of which is pivoted to the crank I4 on the transverse shaft 75, carrying a similar crank I6 at the opposite side of the press. The swinging ends of the levers I4 and 16 are attached to vertical rods 80 and SI, respectively, having their upper ends attached to cranks 82 and 83, respectively, attached to eccentrics 84, one at each side of the press above the vertically slidable journal blocks 55. The journal blocks are yieldingly urged upwardly by the springs 85. Rocking of the arms I4 and 83 servesto rock the eccentrics 84 to 4 cause the blanket to clear the plate during the forward movement of the plate carrier. The parts are so timed, accordingly, that when the plate moves forward, the arms I4 and 83 are rocked so that the impression cylinder will be 1 held in its raised position by the springs 85.

When the impression is to be taken, the arms I4 and 83 are reversely rocked to operate. the eccentrics to lower the journal blocks 55 to move the impression cylinder into its lowermost position to cause the paper to contact wtih the plate to take the impression as the plate moves from right to left as viewed in Fig. 22. In Fig. 21 the impression cylinder is shown in its upper position and in Fig. 22 it is shown in broken lines in its lower position.

' end of the connecting rod 10 upwardly to disen Permanent vertical adjustment of the impression cylinder I3 is effected by means of the screws 99 having their lower ends bearing against the bearing blocks 9| below which the eccentrics 84 are mounted. The screws 99 are carried on ver-' tical shafts 92, adapted to be rotated by the worm gear 93 meshing with the worm 94, adapted to be operated by the hand wheel 95, so that both ends of the cylinder are simultaneously raised or lowered an equal distance by one operation.

The following means are provided for disconnecting the means for vertically reciprocating the impression cylinder. This may be accomplished by disengaging the connecting rod ID from the bell crank 69. As seen in Fig; 1, the connecting rod 10 is not permanently fastened to the bell crank 69, but is provided at its end with a hook Illa engaging a pin onthe bell crank 69. Means are provided for moving the left-hand gage the hook from the pin. As here shown,

inking roller if inking such means include the pivoted lever I.00. with a I roller'I0I ilying .under the connecting rod 10.. A

pedal I02 is provided forrocking. the lever I upwardly to causethe roller IOI .to .lift theIrod 'I0Iand disengagethe hook 'I0aI from the pin.

Connection between the pedal I I02 and arm. I00 :is .effected by means of the rock lever I03 and short connecting rod I04as shown in Fig. 1. As

soon. as the mechanism is disconnected, the springs 85 will automatically raise the impression cylinder to .its uppermostposition. I

Inlcing mechanism y The inking roller I2 is inked by means of the twofountain rollers I05 and I06 carrying an ink supply I01 between them. The fountain rollers I05 and I06 are drivenin the direction indicated by the arrows in Fig. 5 by means of the motor I08 operating through the train of gears indicated in general by I09. This rotation of the fountain rollers I05 and I06 is continuous When the inking roller I2-Iis Iinits lower position to ink the plate,during the return movement of the latter, saidIink roller I2 is Ioutfof contact with thefountain roller I I06. When it is raised, during the time that the plate makes I latter part of the returnstroke both the plate and the fountain roll er tend torotate the inking roller I2 in the same direction and at substantiallythe same rate. I This avoids any undue strain on theparts, as would be occasioned by the plate having to reverse the rotation of the were effected during forward movement. I

The ink roller is vertically reciprocated int he following manner. Theshaft 65 carries a cam III] with a cam groove III'embracing a cam roller II2 on theIcrank II3 pivoted at H4. The shaft II4 extendstransversely of the press and carries an arm II5 (similar to the arm H3) on the opposite side.; The arms H3 and H5 operate through similar mechanism on each side of the press to raise and lower the ink roller, andconsequently, I shall describe only the mechanism 01130ne side The arm II3 operates through the link 6- to rock the transverse shaft II! by means of the crank II8. At each side of themachine the transverse shaft =II1 carries an eccentric. which, in turn; carries the lower end of a vertical shaft II9,-the upper end of which is attachedto one end ofythe shaft II carrying the inking roller I2. lRocking of the shaft III,

therefore; operates through the eccentrics (not I shown 'indetail) *to reciprocate the ink roller I2 vertically, as originallyrdesoribed. The vertically movable rods ,II9 aremounted insuitable grooves in the frameof the machine to per-.

mit 'theirvertical movement, and the ends of I the shaft I20 are suitably journaled in the upper end of these rods I I9. I I i I In order'to secure an even distribution of ink on the I plate" one of the fountain rollers is crowned. I These rolls, each solid steel, are about twenty-eight inches'long and six inches in diameter; but one of them is about one-hundredth of. an inchfgreater inIdiameter at "the center than at the ends." This overcomes the difficulty which has heretofore made long fountain rollers impractical, the tendency to pass. considerably more ink at the center than at the ends. I I i I Gripping mechanism I Thegripping mechanism comprises, in general, means in cooperation with the impression roller for gripping a sheet on the feed table so that the sheet will be held against the impres sion roller while the impression is taken. After an impression is taken, the impression roller continues its rotation in the samedirection and finally the gripper is released and the paper discharged from the rolleronto the delivery con-I veyor at the delivery end of the press. I

. Asshown in the drawings, the gripping mech anism includes a series of upper gripping? fingersI2I Imounted on a shaft I22 and a series of lower delivery fingers I23 mounted on the shaft I24. The shafts I22 and I24 areuboth reciprocable to raise and lowerIthe fingers. As shown in Fig. 8, the fingers I2I are lowered .to grip the front edge I250 of a sheet of paper I25 lying on the feedtable I6." I26, I26 indicate two positioning members against which the forward edge of the paper I25 is. placed, preparatory to its being gripped by the gripping mechanism. Substantially, at the time thegrippers grip the paper and commence to move it forward, the positioning members I26, I26 are swung upwardly and away from the paper'to permitits removal. In Fig. 9 the gripper fingers I2I are raised, releasing the forward edge ofpthe paper, the delivery fingers I23 raising the edge I250. from the roller so that continued rotation of the impression cylinder I3 will dischargethe paper onto the bridging members I21 mounted onqtheIshaft I28 fromgwhich theIpaper isIdischarged onto the delivery conveyor strips I29 at the delivery end of thepress. The shaft I28 is rockable so that during the firstpart of the rotation of the impression cylinder, when the paperis to be carried to the plate for animpression; the pointedends of the bridging members I2II are slightly elevated as shown in 'Fig. 8. When thepaper is to be discharged, they are somewhatlowered and the gripper fingers are somewhat raised so that as the gripper'fingers release the paper, its forward edge, raised by the fingers I23, will engage the bridging members I2I, as :shown inFig. 9,'to cause the paper to be delivered to the conveyor I29. Thefollowing mechanism is provided for cs- 1 cillating the shafts I22 and I24 carrying the fin I gers'I2I and I23, respectively. Theshaft I22 carries anarm I30 with a cam roller I3I engag- The position of the cam I32, in turn, is controlledby the pivoted lever I33 carrying a cam roller I34 engaging ing a movable cam I32.

the cam I35 on a cam wheel I36. The shaft I24 carries an arm I3'I having a cam roller I38 I engaging a cam I39 carried by the lower end of the. lever I40 pivoted at I4I, theupper end of which carries a cam roller I42 adapted to engage another cam I43 on the cam wheel IIIIia; 1 The cam I32 is yieldingly held outwardly by thespring I44. The cam roller I3I is yieldinglyheld against'its cam by the spring I45. The spring I46 serves to hold the cam roller I42 against the cam wheel I36a. The parts are so timed and coordinated, and the cams are so shaped, that thegripper fingers will lower to grip the forward edge of a sheet of paper as'shown in Fig. 8 at thecommence ment of rotation of the impression cylinder-in the forward direction. In other words, as shown in Fig. 8, the impression cylinder has just completed its rotation in a clockwise direction and the gripper fingers have been raised and lowered to grip the forward edge of the paper, and the cylinder is ready to commence its rotation in a forward direction, that is, in a counterclockwise direction, as viewed in Fig. 8, to withdraw the paper from the feed table to take it down to the plate for an impression. In the position shown in Fig. 9, the impression has been completed and the cylinder is still continuing its rotation in a counterclockwise direction and the gripper fingers and delivery fingers have raised to cause commencement of delivery of the paper.

In Fig. '1 is shown the mechanism for retracting the positioning members I26 at the time the paper is withdrawn from the feed table by the impression cylinder. on an oscillating shaft I50 which is rocked by means of a cam roller I5I which is engaged by the cam I52 mounted on the shaft I53 which also carries the cam wheels I36 and I36a. When the roller I5I rides up on the cam, the positioning members I26 are swung to the left (as viewed in Fig. '7) by rockingthe shaft I50. The shaft I50carries an arm I55 adapted to engage a stop I56 to limit backward movement of the members I26. I51 indicates a spring to yieldingly urge the roller I5I in contact with the cam I52. Adjusting means including the screw I59 are provided for adjusting the position of the members I26.

The shaft I53 is driven from the shaft I60 through the gears I6I and I62. The shaft I60 is driven from the shaft I63 through the bevel gears I84 and I65. The shaft I63 is driven from the shaft I66 through the bevel gears I61 and I68. The shaft I66 is driven from the shaft 36 through suitable gears.

Wiping and polishing mechanism The wiping and polishing is accomplished by means of a strip of wiping material I5 such as cloth, paper, or the like, over the wiping and polishing roller I4. The strip of material is preferably of a rough or ridged surface type, as burlap or paper creped into transverse ridges. The new material is supplied from the feed roller I10 and the used material rewound onto the roller I1I. I12 is an idler roller over which the material lies before being bent over the roller I4. I13, I14, I15 and I16 indicate idler rollers over which the material is festooned. I11, I11 indicate rock arms carrying the rollers I18 and I19 constituting a suitable tensioning device. These parts may be seen diagrammatically in Figs. 21 and 22.

As has been explained before, and as shown in Figs. 21 and 22, the roller I4 rotates in a clockwise direction to wipe the plate as it moves from left to right. After the plate leaves the roller, its rotation continues a short distance to expose a clean portion of the material I5. At the beginning of the return movement of the plate, the roller rotates in a counterclockwise direction so that this clean portion of the material is used to polish the plate. Upon the next succeeding forward movement of the plate, the portion thus used for polishing is used for the wiping operation. As will be discussed hereinafter, the roller I4 is jogged or vibrated transversely of the machine (longitudinally of the axis of the roller) during the wiping and polishing operations.

The fingers I26 are carried Continuous tension is maintained in the strip of material I5 by the friction drive on the rewind roller I1I. This drive is shown in Fig. 20. I indicates the axle carrying the roller I1I. This .axle carries a pinion I8I engaged by the pinion I82. I83 indicates a driving pinion frictionally connected to the driven pinion I82 through the friction clutch mechanism indicated in general by I84, so that continuous rotation of the driving member I83 will maintain a continuous slipping drive against the member I82. The gear I83 is driven from the shaft I66 through the bevel gears I85 and I86.

I81 indicates a friction brake on the shaft I88 carrying the feed roller I10 to prevent undesired over-running of the material I5.

Oscillations of the roller I4 are accomplished in the following manner. Drive is taken from the shaft 33 by means of the bevel gears I90 and I9! (see Fig. 12) to the vertical shaft I92 entering the gear box I93, shown in Figs. 12-19, inclusive. The mechanism in this gear box serves to oscillate and vibrate the roller I4 as originally described.

The oscillating of the roller is controlled by means of the cam roller I94 on the shaft 39, the surface of which is configured to operate the cam roller I95 on the rock shaft I96 pivoted at I91a. The rock shaft I96 controls the vertical rod I91 leading to the crank I98 connected to the shaft I 99 entering the gear box I93. See Fig. 1. Oscillations of the shaft I99, caused by rocking of the arm I98, operate through the fingers 200 to move the shifting collar 20I and thus slide the pinion 202 splined to the shaft 203 to cause said pinion 202 to engage with either one or the other of the two reversely rotating loose driving pinions 204 and 205 on the shaft 203. These pinions 204 and 205 are continuously driven from the driving shaft 206. The pinion 205 is driven from the pinion 201. The pinion 204 is driven in a reverse direction from the pinion 208 through the intermediate gear 209. The shaft 206 is driven by the bevel gear 2I0 which, in turn, is driven from the bevel gear 2 on a shaft carrying the pinion 2I2 which, in turn, is driven by pinion 2I3 on the shaft I92.

The cam wheel I94 is so shaped that gear 202 will be shifted back and forth through the mechanism described to cause the roller I4 to oscillate as originally explained.

Drive from the shaft 203 is transmitted to the shaft 2I4 carrying the roller I4 through the gears 2I5, 2I6, H1 and 2I8. The gear 2I5 is on the shaft 203 and the gear 2IB is on the shaft 2I4. Gears 2I6 and 2H are intermediate gears.

As explained before, the roll I4 is continuously vibrated or reciprocated transversely of the press, that is, longitudinally of the axis of the roll. This is accomplished in the following manner. The drive is effected from the pulley 2 I9 on the shaft 220 driven by the belt 22I from the motor 222. The shaft 220 carries an eccentric 225 operating a fork 226 carrying the pin 221 to which is attached one end of the shaft 2I4 carrying the roller I4.

The arms I11 carrying the rollers I18 and I19 are mounted on the shaft 228 which is rockably supported in suitable bearings. By this arrangement suitable tension is maintained upon the runs of the material I5 leading to the roller I4 to permit oscillations of the latter. As shown in Fig. 21, the roller I4 is commencing to rotate clockwise. This will serve to raise the roller I18 and lower the roller I19 to the positions they

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