US3027833A

US3027833A - System for print size control in proof presses

Info

Publication number: US3027833A
Application number: US797774A
Authority: US
Inventors: Fred A Fouser
Original assignee: Vandercook and Sons Inc
Current assignee: Vandercook and Sons Inc
Priority date: 1959-03-06
Filing date: 1959-03-06
Publication date: 1962-04-03
Anticipated expiration: 1979-04-03

Description

April 3, 1962 F. A. FOUSER 3,027,833

SYSTEM FOR PRINT SIZE CONTROL IN PROOF PRESSES 4 Sheets-Sheet 1 Filed March 6, 1959 Fred ,4. Fouser F. A. FOUSER April 3, 1962 SYSTEM FOR PRINT SIZE CONTROL IN PROOF PRESSES 4 Sheets-Sheet 2 Filed March 6, 1959 15122221 471" 7 Fred A. Fouser fig;

April 3, 1962 F. A. FOUSER 3,027,833

SYSTEM FOR PRINT SIZE CONTROL IN PROOF PRESSES Filed March 6, 1959 4 Sheets-Sheet 3 Eran-[0r Ffea A Fo user April 3, 1962 F. A. FOUSER 3,027,833

SYSTEM FOR PRINT SIZE CONTROL IN PROOF PRESSES Filed March 6, 1959 4 Sheets-Sheet 4 Fred I A. F'o'user United States Patent C) 3,027,833 SYSTEM FOR PRINT SIZE CONTROL IN PROOF PRESSES Fred A. Fouser, Chicago, 11]., assignor to Vandercook & Sons, Inc., Chicago, 111., a corporation of Delaware Filed Mar. 6, 1959, Ser. No. 797,774 8 Claims. (Cl. 101 252) This invention relates to proof presses and more particularly to offset proof presses; Such presses are adapted to use a printing plate which is chemically processed to form moisture-receptive non-printing areas and nonmoisture receptive printing areas corresponding to the image to be reproduced. Moisture is first applied over the surface of the plate to be retained in non-printing areas thereof after which ink is applied to be repelled from the moistened areas and retained by the non-moistened printing areas and thereby form an image on the plate.

After inking of the plate, a blanket cylinder having a resilient surface of rubber or the like is rolled over the plate to effect transfer of the image from the plate to the cylinder. The cylinder is then rolled over the sheet of paper to transfer the image thereto.

In the construction of such presses, the blanket cylinder and dampening and inking rollers are mounted on a carriage reciprocable over spaced stationary beds which carry the plate and the sheet to be printed, with means being provided to control'engagement of the cylinder and rollers with the plate and sheet.

In the use of such presses, it is often times desirable to imprint more than one image on a single sheet. For example, it may be desired to imprint an image in one color on the sheet and then superimpose another image in another color. To do so, a number of sheets, perhaps a hundred or so, may be imprinted with an image in one color. The plate is then removed and replaced by a plate formed with the image for the other color and the inking roller system is cleaned and set up for the other color. The sheets are then placed one by one on the sheet bed and imprinted with the image in the other color.

In such multi-image printing, it has been found to be extremely difficult and often times impossible to obtain registration of the images over the entire printing area of the sheet. For example, if the sheets are so positioned as to obtain registration of the images on one edge portion of the printing area, the images may be offset to a substantial extent on the opposite edge portion. It has usually been the practice to attempt to obtain regisration in the central portion of the sheet, or in the portion in which registration of the images is most critical, and then allow mis-registration of the images in other portions of the sheets. Various methods of attempting to obtain registration have heretofore been proposed, but no known satisfactory solution has heretofore existed.

This invention, accordingly, was evolved with the object of providing an improved proof press system in which accurate registration of images is possible.

Another object is to provide a system of accurate image registration using a very simple and reliable mechanism.

A further object is to provide a proof press system utilizing a mechanism which is readily and quickly adjusted to obtain accurate image registration.

According to this invention, the sheet bed is moved in a direction parallel to the movement of the carriage during engagement of the blanket cylinder with the sheet carried by the sheet bed. With this very simple system, it is found to be possible to obtain very accurate registration of images. To explain this result, it is important to consider certain aspects of the printing operation.

When the blanket cylinder is rolled over the printing plate, it picks up the ink image and also picks up moisture from the non-printing areas of the plate. When the cylinder is then rolled over the sheet, the moisture is transferred thereto along with the ink. At the same time, a certain amount of pressure is applied to the sheet. The combination of pressure and moisture may result in lengthening of the paper in the direction of movement of the carriage. As the paper dries, it may shrink to a certain extent, depending upon the composition thereof, and after it is dry it may have a length equal to its original length but, in most cases, it will have a length which is either greater or less than the original length.

It is found that this stretching or shrinking of the paper is predominantly in the direction of movement of the blanket cylinder over the sheet and comparatively little change in size occurs in a transverse direction.

By moving the sheet in a direction parallel to the direction of movement of the carriage in a subsequent printing operation, in accordance with this invention, it is possible to precisely compensate for the lengthening or shortening of the sheet. For example, if the sheet has been lengthened, it is necessary to lengthen the image in a subsequent printing operation. To do so, the sheet bed is moved in a direction opposite to the direction of movement of the carriage.

It should be noted that means are provided for fixing the amount of rotation of the blanket cylinder relative to its linear movement along the bed. For example, a gear on the cylinder may mesh with a rack on the frame of the press. It might seem that movement of the sheet bed might produce blurring of the image under such conditions. In practice, however, it is found that the blanket cylinder surface is sufficiently resilient, and the movement of the sheet bed is. sufficiently gradual, to prevent any observable blurring action.

A specific feature of the invention is in the provision of a comparatively simple and very reliable mechanism for effecting the required movement of the sheet bed.

Another feature is in the provision of readily operated means for quickly adjusting the amount of movement of the sheet bed.

This invention contemplates other objects, features and advantages which will become more fully apparent from the following detailed description taken in conjunction with the accompanying drawings which illustrate a preferred embodiment and in which:

FIGURE 1 is a side elevational view of a proof press constructed according to the principles of this invention;

FIGURE 2 is a top plan view of the press of FIG- URE 1;

FIGURE 3 is a side elevational view, on an enlarged scale, of the carriage of the press of FIGURES 1 and 2, the relationship of FIGURE 3 to FIGURE 2 being indicated by arrows IIIIII in FIGURE 2;

FIGURE 4 is a side elevational view, on an enlarged scale, of a portion of the stationary part of the press, the

3 relationship of FIGURE 4 to FIGURE 2 being indicated by arrows IVIV in FIGURE 2;

FIGURE 5 is a side elevational view, on an enlarged scale, illustrating the side of the carriage opposite that shown in FIGURE 3, the relationship of FIGURE 5 to FIGURE 2 being indicated by arrows V-V in FIG- URE 2; and

FIGURE 6 is a sectional view taken substantially along line VIVI of FIGURE 5.

Reference numeral 10 generally designates a printing press according to the principles of this invention. The press 10 comprises a carriage 11 mounted on an elongated frame 12 for reciprocable movement. As illustrated in FIGURES l and 2, the carriage 11 is at the left-hand end of the frame 12, hereinafter referred to as the rear or rearward end. The carriage 11 is movable forwardly, to the right as viewed in FIGURES 1 and 2,.

to successively pass a plate bed 13 and a sheet bed 14 supported in spaced relation in the frame 12. After reaching the front or forward end of the machine, the right-hand end as illustrated in FIGURES 1 and 2, the carriage is moved back to the initial rearward position as illustrated. This movement of the carriage is preferably efiected through a motor drive arrangement, not illustrated, of a type known in the art, although it could be effected by hand.

' Iournalled on the carriage 11 are a dampening roller 15, four

inking rollers

16, 17, 18 and 19, and a blanket cylinder 20. The blanket cylinder preferably has a resilient surface of rubber or the like. In the normal printing operation of the machine, the carriage moves forwardly, to the right as illustrated in FIGURES 1 and 2, and the dampening roller 15 is engaged with a plate on a plate bed 13 to apply moisture thereto. This moisture is retained by moisture-receptive non-image areas of the plate. The plate is then engaged successively by the inking rollers 16-19, the ink being retained on nonmoistened image areas of the plate. The plate is then engaged by the blanket cylinder, to cause transfer of the image from the plate to the surface of the cylinder.

Upon reaching the sheet bed, the dampening roller 15 and the inking rollers 16-19 are tripped upwardly so as not to engage a sheet on the bed 14. The blanket cylinder, however, engages a sheet on the bed 14 to transfer the image thereto. After reaching the right-hand front or forward end of the machine, the carriage is moved back toward the initial rear position as illustrated and during this movement, the blanket cylinder 20 and the inking rollers 16-19 are tripped upwardly so as not to engage either the sheet on the bed 14 or the plate on the bed 13. The dampening roller 15, however, may be lowered to engage the plate on the bed 13, to maintain moisture in the moisture-receptive areas of the plate.

When the carriage is returned to the initial rearward position as illustrated, water is applied to the dampening roller 15 and ink is applied to the inking rollers 16-19 in preparation for the next cycle of operation.

It should be noted that the amount of angular rotation of the blanket cylinder 20 relative to linear movement of the carriage 11 is fixed by means of a gear 21 on the cylinder 20 which meshes with a rack 22 formed in one upper side portion of the frame 12.

Referring to FIGURE 3, the blanket cylinder 20 is journalled on a shaft 23 carried on an arm 24 journalled in the carriage, the axis of the shaft 23 being displaced or eccentric to the axis of rotation of the arm 24. The arm 24 is connected through a link 25 to a crank arm 26 which is affixed to a gear 27 rotatable on a shaft 28 afiixed to the carriage. The gear 27 meshes with a sector gear 29 keyed to a shaft 30 which is journalled by the carriage, the inner end of the shaft 31 being secured to an arm 31 which carries a roller 32. The roller 32 projects inwardly into a cam track on one side of the main frame to control the vertical position of the blanket cylinder 20.

In the operation of a mechanism as thus far described, movement of the roller 32 results in rotation of the sector gear 29 in a counterclockwise direction as viewed in FIGURE 3, to rotate the gear 27 together with the crank arm 26 in a clockwise direction, to move the link 25 upwardly and rotate the arm 24 in a clockwise direction, to lower the blanket cylinder 20. Accordingly, movement of the roller 32 upwardly causes movement of the blanket cylinder 20 downwardly.

Referring now to FIGURE 1, when the carriage is in the rearward position as illustrated, the roller 32 is positioned below the lower surface of a horizontal bar 33 affixed to the side of the frame 12. When the carriage is moved forwardly to a position such that the blanket cylinder is disposed adjacent the left-hand or rearward edge of the plate bed 13, the roller 32 engages the upper surface of a cam 34 to cause the roller 32 to move upwardly and to cause the blanket cylinder to move downwardly to engage a plate on the plate bed 13. With further movement in the forward direction, the roiler 32 rides over the upper surface of a horizontal bar 35 and thence over the upper surface of a control cam 36 and thence over the upper surface of another horizontal bar 37, the roller 32 being thus maintained in an elevated position, to maintain the blanket cylinder 2t) in a lowered position for engagement with a sheet on the sheet bed 14.

When the blanket cylinder 20 reaches the forward end of the sheet bed, the roller 32 engages the lower surface of "a cam plate 38 to cause the roller 32 to move downwardly and thus raise or trip the blanket cylinder to an elevated position. At this time, the roller engages the upper surface of a control cam 39 to pivot the same downwardly against the action of a spring, not shown, acting thereon. At the completion of the forward movement, the roller 32 is in a downward position, with the blanket cylinder 20 being elevated or tripped, and the control cam 39 is returned to the position as illustrated through the action of the spring means acting thereon.

When the carriage is then moved in the rearward direction, the cam roller 32 moves under the cam 39, under the plate 37, then under another control cam 40 adjacent the cam 36, then under the bar 35, and then engages the lower surface of the control cam 34 to move the same upwardly against the action of a spring, not shown, acting thereon, the roller 32 then moving under the bar 33 to the initial position. Thus on return movement, the blanket cylinder is maintained in a tripped or elevated position, so as not to engage either a sheet or a plate.

The above-described control of the blanket cylinder 29 is that used in a normal printing operation. In certain circumstances, and particularly when initially setting up and adjusting the operation of the machine, it is desirable to prevent engagement of the blanket cylinder 20 with either or both the plate or the sheet, during forward movement and to cause engagement of the blanket cylinder 20 with either or both the plate or the sheet on rearward movement. For this purpose, the

control cams

34, 36, 39 and 40 may be manually controlled to obtain any of such operations as may be desired.

Somewhat similar means are provided for controlling the inking rollers 16-19, a portion of the casing of the carriage being broken away in FIGURE 3, to show the mechanism used to control the inking roller 18. As shown, the inking roller 18 is disposed on a shaft 41 one end of which is journalled by a bearing 42. The bearing 42 is secured to the upper end of a rod 43 journalled for vertically slidable movement in the carriage. The rod 43 has a downward-1y facing shoulder 44 on its inner side which rests against a cam 45 affixed to a shaft 46 which is journalled by the carriage. The inner end of the shaft 46 is afiixed to an arm 47 which carries a roller 48 arranged to engage in cam tracks formed on the side of the frame 12. With this mechanism, movement of the roller 48 upwardly results in rotation of arm 47 and cam 45 in a clockwise direction to move rod 43 upwardly and elevate one end of the shaft 41. A similar mechanism is provided at the other end of the inking roller 18,,and it will be understood that similar mechanisms are provided at both end-s of each of the inking

rollers

16, 17 and 19.

For distribution of ink on the inking rollers 16-19, vibrator rolls 49, 50 and 51 are arranged to engage between the upper sides of adjacent inking rollers, suitable means being provided for axially reciprocating the rolls 49-51 as they are rotated. Vibrator roll 51 is supported on a shaft 52 one end of which is carried by a plate 53 which carries a pin '4 disposed in a slot of a plate 55 which is carried on the upper end of an upright member 56 secured to the bearing 42. A similar support is provided at the other end of the vibrator roll 50 and similar supports are provided at both ends of the vibrator rolls 49 and 51.

Referring now to FIGURE 1, the roller 48, and similar rollers for controlling the other inking rollers are initially disposed on a horizontal surface 57 on the side of the frame when the carriage is in its rearward position. When the carriage is moved forwardly, the control rollers engage an upwardly inclined cam surface, not shown, to elevate the same and cause the inking rollers to clear the rearward edge of the plate bed, which may be raised slightly above the level of the plate. The control rollers then ride on a horizontal surface 58 and then on a downwardly inclined surface 59 to be brought back into engagement with the surface 57 and to move under a bar 60 affixed to the side of the frame. The inking rollers will then be engaged with a plate on the plate bed 13.

When the inking rollers reach the forward end of the plate bed 13,'the control rollers engage an upwardly inclined cam surface 61 to be elevated and to then engage the upper surface of a bar 62 secured to the side of the frame. The inking rollers are thereafter maintained upwardly in the remainder of the forward movement of the carriage, so as not to engage a sheet on the sheet bed 14. During movement up the cam surface 61, the control rollers engage a control cam 63 to pivot the same upwardly out of the path of the control rollers, against the action of spring means, not shown. On return movement of the carriage in the rearward direction, the control rollers ride over the upper surface of the bar 62, then over the upper surface of the control cam 63 and then over the upper surface of the bar 60. The control rollers then engage a control cam 64 to pivot the same downwardly against the action of spring means and to then ride over the upper surface thereof. The rollers then ride over the surface 58, and then down the previously described but unillustrated inclined surface, to return to their initial positions on the surface '57.

The above-described operation is for normal printing, but in some circumstances, particularly when setting up the machine, it may be desirable to engage the inking rollers when the plate on return or rearward movement of the carriage. For this purpose, the control cam 63 may be pivoted upwardly to direct the control rollers down the inclined surface 61 and under the bar 60. It will, of course, be understood that cam tracks similar to those thus far described are provided on the opposite side of the frame, for control of the opposite end of the inking rollers.

The dampening roller 15 is mounted on a shaft 65 which is journalled in a bearing 66. Bearing 66 is supported on the upper end of a rod 67 which is journalled for vertically slidable movement in the carriage. The rod 67 has an inclined lower surface, not shown, engaged by the upper surface of a wedge member, also not shown, disposed behind a plate 68 for movement inwardly and outwardly with respect to the side of the frame. A cam track 69 is disposed along the side of the frame and includes surfaces inclined inwardly and outwardly with respect to the frame to control movement of the wedge member inwardly and outwardly and thereby control movement of the dampening roller 15 upwardly and downwardly, the dampening roller being engaged with the plate on the plate bed '13 during both forward and rearward movement of the carriage. For distribution of water on the dampening roller 15, a distributor roll 70 is supported therea-bove.

According to this invention, the sheet bed 14 is gradually shifted forwardly or rearwardly while the blanket cylinder 20 moves thereover to shorten or lengthen the impression on the sheet of paper. Conceivably, this shifting movement could be effected by hand, but in accordance with this invention, a comparatively simple and very reliable mechanism is provided for controlling the shifting movement of the sheet bed 14.

Secured to the forward end of the sheet bed 14 is a bracket 71 including a pair of spaced portions 72 and 73. The rearward end of a link 74 is disposed between portions 72 and 73 and is pivotally secured thereto by means of a pin 75. The forward end of the link 74 extends between a pair of arms 76 and is pivotally secured thereto by means of a pin 77. Arms 76 are secured to the central portion of a transverse shaft 78. One end of the shaft 78 is extended outwardly beyond the side of the frame and has secured thereto the hub portion 79 of an arm 80 which extends rearwardly along the side of the frame 12. At its rearward end the arm 80 carries a cam roller 81.

With the mechanism as thus far described, it will be appreciated that as the roller 81 is moved upwardly, the shaft 78 will be rotated in a clockwise direction as viewed in FIGURE 1, or a counter-clockwise direction as viewed in FIGURE 4, to shift the sheet bed 14 forwardly. With downward movement of the roller 81, the sheet bed is, of course, shifted rearwardly.

Referring now to FIGURE 5, the carriage 11 carries a generally channel-shaped cam member 82 which includes a vertical wall 83 and a pair of spaced parallel generally

horizontal walls

84 and 85 projecting inwardly from the upper and lower edges of the vertical wall 83. A pin 86 is secured to the member 82 adjacent the forward end thereof and extends outwardly through an opening in the lower end of an arm 86a which is secured to and projects downwardly from a side portion of the carriage 11. A pin 87 is secured to the member 82 adjacent the rearward end thereof and projects outwardly through an opening in a fitting 88 which is secured to the lower end of a vertical rod 89. The upper end of the rod 89 extends through a rearwardly extending portion 90 of an upstanding member 91 on the carriage 11, and an adjustment knob 92 is threaded on the upper end of the rod 89. When the knob 92 is rotated, the rod 89 is moved upwardly or downwardly, to pivot the cam member 82 upwardly or downwardly about the axis of pin 86. The rod 89 may carry a pointer member 93 movable vertically along a scale 94 provided with suitable indicia for indicating the vertical position of rod 89 and hence the position of the cam member 82.

When the carriage is moved forwardly to a position such that the blanket cylinder 20 is at the rearward edge of the sheet bed 14, the roller 81 will be engaged between the upper and

lower walls

84 and 85 of the cam member 82. This relationship is illustrated in FIGURE 6. As forward movement of the carriage 11 continues, the roller 81 will remain in the same position, or will be gradually shifted either upwardly or downwardly, depending upon the position of adjustment of the cam member 82.

If, for example, the cam member 82 is so positioned that the

walls

84 and 85 are horizontal, the position of roller 81 will remain stationary. If the cam member 82 is shifted downwardly about the axis of the pin 86, the roller 31 will be engaged by the lower surface of the upper side wall 84 to be gradually shifted downwardly as the carriage is moved forwardly. This will cause a gradual shifting of the sheet bed 14 in a rearward direction. If the cam member 82 is shifted upwardly about the axis of the pin 86, the roller 81 will be engaged by the upper surface of the lower wall 85 to be gradually shifted upwardly and to gradually shift the sheet bed 1 forwardly.

It will thus be appreciated that with this comparatively simple mechanism, the sheet bed 14 can be gradually shifted either forwardly or rearwardly as desired, during engagement of the blanket cylinder 2% with the sheet. This movement can be controlled with great accuracy by adjustment of the knob '92. Furthermore, it will be apparent that the adjustment can be quickly effected.

To insure initial positioning of the roller 81 between the

walls

84 and 85 of the cam member 82, the cam member 32 is preferably provided at its forward end with wall portions 95 and 6 extending angularly upwardly and downwardly from the forward ends of the

wall portions

84 and 85. Similarly, the cam member 82 at its rearward end may include wall portions 97 and 93 extending angularly upwardly and downwardly from the rearward ends of the wall portions 84 and S5, to insure that the roller will become positioned within the channel member on return rearward movement of the carriage.

This invention thus provides a readily and quickly adjustable system for either shortening or lengthening the size of an image produced on the sheet of paper. It is noteworthy that with the cam, lever and linkage arrangement as illustrated, the ratio between movement of the sheet bed and the corresponding movement of the carriage is substantially linear, which is highly desirable since the stretching or shrinking of a sheet will ordinarily be uniform along its length. It is also noted that the degree of movement of the sheet bed is small compared to the corresponding vertical movement of the roller 81 so as to reduce the accuracy required in positioning of the cam member 82 and at the same time to more accurately control the movement of the sheet bed.

It will be understood that modifications and variations may be effected Without departing from the spirit and scope of the novel concepts of this invention.

I claim as my invention:

1. In a printing press, a frame, a plate bed and a sheet bed in spaced relation on said frame, a carriage mounted for movement back and forth between opposite ends of said frame, inking rollers journalled by said carriage and arranged to apply ink to a plate on said plate bed, a blanket cylinder journalled on said carriage and arranged to engage a plate on said plate bed to pick up an image therefrom and to then engage a sheet on said sheet bed to transfer the image thereto, and means for gradually shifting said sheet bed in parallel relationship to the direction of movement of said carriage during engagement of said blanket cylinder with the sheet.

2. In a printing press, a frame, a carriage mounted for movement back and forth between opposite ends of said frame, bed means on said frame, cylinder means on said carriage, said bed means being arranged to support a sheet and said cylinder means being arranged to carry an ink image to be transferred to the sheet upon inter-engagement of said means, means operative during inter-engagement of said bed and cylinder means for producing movement of said bed means in parallel relationship to the direction of movement of said carriage and at a substantially constant ratio to the movement of said carriage.

3. In a printing press, a frame, a carriage mounted for movement back and fourth between opposite ends of said frame, bed means on said frame, cylinder means on said carriage, said bed means being arranged to support a sheet and said cylinder means being arranged to carry an ink image to be transferred to the sheet upon inter-engage- 8 ment of said means, means operative during inter-engagement of said bed and cylinder means for producing move .ment of said bed means in parallel relationship to the direction of movement of said carriage and at a substan tially constant ratio to the movement of said carriage, and means for adjusting said ratio.

4. In a printing press, a frame, a carriage mounted for forward and rearward movement between opposite ends of said frame, bed means on said frame, cylinder means on said carriage effectively engageable with said bed means on forward movement of said carriage, said bed means being arranged to support a sheet and said cylinder means being arranged to carry an ink image to be transferred to the sheet upon inter-engagement of said means, means operative during interengagement of said bed and cylinder means for producing movement of said bed means in parallel relationship to the direction of movement of said carriage and at a substantially constant ratio to the forward movement of said carriage, and means for adjusting said ratio to any selected value Within a range extending from a negative value to produce rearward movement of said bed, to a positive value to produce forward movement of said bed.

5. In a printing press, a frame, a carriage mounted for movement back and forth between opposite ends of said frame, bed means on said frame, cylinder means on said carriage, said b ed means being arranged to support a sheet of paper and said cylinder means being arranged to carry an ink image to be transferred to the sheet upon inter-engagement of said means, a first member carried by said carriage, a second member movably supported on said frame for engagement by said first member during inter-engagement of said bed and cylinder means, and means coupling said second member to said bed means for producing gradual movement of said bed means in a direction parallel to the direction of movement of said carriage during inter-engagement of said bed and cylinder means.

6. In a printing press, a frame, a carriage mounted for movement back and forth between opposite ends of said frame, bed means on said frame, cylinder means on said carriage, said bed means being arranged to support a sheet and cylinder means being arranged to carry an ink image to be transferred to the sheet upon inter-engagement of said means, a cam follower member supported on said frame for movement in a direction generally transverse to the direction of movement of said carriage, a cam member on said carriage having a surface engageable with said cam follower member during inter-engagement of said bed and cylinder means, and means coupling said cam follower member to said sheet bed for shifting said sheet bed in a direction parallel to the direction of movement of said carriage in response to movement of said cam follower member.

7. In a printing press, a frame, a carriage mounted for movement back and forth between opposite ends of said frame, bed means on said frame, cylinder means on said carriage, said bed means being arranged to support a sheet and said cylinder means being arranged to carry an ink image to be transferred to the sheet upon inter-engagement of said means, a cam follower member supported on said frame for movement in a direction generally transverse ,to the direction of movement of said carriage, a cam member on said carriage having a surface engageable with said cam follower member during inter-engagement of said bed and cylinder means, means coupling said cam follower member to said sheet bed for shifting said sheet bed in a direction parallel to the direction of movement of said carriage in response to movement of said cam follower member, and means pivotally supporting said cam member on said carriage for adjustment of the angle of inclination of said surface relative to a plane parallel to the direction of movement of said carriage.

8. In a printing press, a frame, a carriage mounted for movement back and forth between opposite ends of said frame, bed means on said frame, cylinder means on said carriage, said bed means being arranged to support a sheet and said cylinder means being arranged to carry an ink image to be transferred to the sheet upon interengagement of said means, an elongated cam track pivotally mounted on said frame, a cam roller connected to said carriage and adapted to be received in said elongated cam track for movement therealong, said cam track being tiltable in response to movement of said cam roller therealong, and rod means pivotally connected to said elongated cam track and to said bed means for moving said bed means in response to movement of said carriage in a direction generally parallel to the direction of movement of said carriage.

References Cited in the file of this patent UNITED STATES PATENTS 1,128,351 Motley Feb. 16, 1915 1,715,712 Koppe June 4, 1929 2,619,901 Harrold Dec. 2, 1952 2,694,941 Spiller Nov. 23, 1954 2,725,010 Vandercook et a1 Nov. 29, 1955