CA2000730C - Device for correcting the register of sheet prints in a sheet-fed rotary printing machine - Google Patents
Device for correcting the register of sheet prints in a sheet-fed rotary printing machineInfo
- Publication number
- CA2000730C CA2000730C CA002000730A CA2000730A CA2000730C CA 2000730 C CA2000730 C CA 2000730C CA 002000730 A CA002000730 A CA 002000730A CA 2000730 A CA2000730 A CA 2000730A CA 2000730 C CA2000730 C CA 2000730C
- Authority
- CA
- Canada
- Prior art keywords
- sheet
- gripper bridge
- gripper
- adjustable
- correcting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000005452 bending Methods 0.000 claims abstract description 26
- 230000033764 rhythmic process Effects 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000012937 correction Methods 0.000 abstract description 4
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F21/00—Devices for conveying sheets through printing apparatus or machines
- B41F21/04—Grippers
- B41F21/05—In-feed grippers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H9/00—Registering, e.g. orientating, articles; Devices therefor
- B65H9/10—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position
Landscapes
- Registering Or Overturning Sheets (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The device relates to the register correction of sheet prints and the compensation of distorted sheets in a sheet-fed rotary printing machine by deformation of the leading sheet edge before the printing unit. It consists of an adjustable bending device which, in accordance with the machine beat, bends a cross-bar on which there are provided adjacent sheet grippers and which extends transversely to the travel direction of the sheet. This bending device cooperates with a pre-gripper exe-cuting swinging movements about a stationary axis or about an axis which can be adjusted into fixed positions, said pre-grip-per comprising a gripper bridge (8) which forms the cross-bar for the sheet grippers and, at least, the ends of which are supported on a gripper bridge shaft (10) by means of flexurally stiff levers (9), said bending device consisting of at least one adjustable stop (12, 21) which is fixed to the machine frame (11) and against which the gripper bridge (8) abuts in approximately the middle between the two levers (9) before, when swivelling back, the gripper bridge ends will have reached their zero position in which the sheet grippers (20) will take the sheet (1).
Description
Device for correcting the register of sheet prints in a sheet-fed rotary printing machine.
The invention relates to a device, provided before the printing unit, for correcting the register of sheet prints and for compensating for distorted sheets in a sheet-fed rotary printing machine by deforming the leading sheet edge.
A device for correcting the register and compensating for distorted sheets is known from the German Patent 31 12 964.
In this specification it is a sheet transfer cylinder which comprises the aforementioned features. The bending device engages the middle of the gripper bridge shaft of the sheet transfer cylinder so that it bends the gripper bridge shaft in accordance with the machine beat, whereby the leading sheet edge is deformed in the middle in or against the direction of rotation of the cylinder. The bending device consists of a movable arrangement of a middle gripper bridge shaft bearing and a cam mechanism including a cam roller and a restoring spring, the instantaneous position of rotation of the cam roller being adjustable by means of a control shaft which, as is suggested in this specification, is formed by the gripper bridge shaft. Such a bending device causes relatively high costs and has above all the disadvantage that an adjustment of the deformation of the leading sheet edge cannot be effected while the machine is running so that it is necessary to stop the machine a number of times in the make-ready phase in order to perform register corrections by deforming the leading sheet edge.
P
The invention relates to a device, provided before the printing unit, for correcting the register of sheet prints and for compensating for distorted sheets in a sheet-fed rotary printing machine by deforming the leading sheet edge.
A device for correcting the register and compensating for distorted sheets is known from the German Patent 31 12 964.
In this specification it is a sheet transfer cylinder which comprises the aforementioned features. The bending device engages the middle of the gripper bridge shaft of the sheet transfer cylinder so that it bends the gripper bridge shaft in accordance with the machine beat, whereby the leading sheet edge is deformed in the middle in or against the direction of rotation of the cylinder. The bending device consists of a movable arrangement of a middle gripper bridge shaft bearing and a cam mechanism including a cam roller and a restoring spring, the instantaneous position of rotation of the cam roller being adjustable by means of a control shaft which, as is suggested in this specification, is formed by the gripper bridge shaft. Such a bending device causes relatively high costs and has above all the disadvantage that an adjustment of the deformation of the leading sheet edge cannot be effected while the machine is running so that it is necessary to stop the machine a number of times in the make-ready phase in order to perform register corrections by deforming the leading sheet edge.
P
The US Patent 2,577,099 shows a device for correcting the register in which the gripper bridge shaft is held at its ends in a sheet transfer cylinder and is also bent in the middle in or against the travel direction of the sheet. For this purpose the gripper bridge shaft is designed either in form of a tube and supported in the middle of a channel in the sheet transfer cylinder on a pair of rollers the axes of rotation of which take different angular positions with respect to the axis of the gripper bridge shaft and the rollers of which can be pressed individually against the gripper bridge shaft by means of an eccentric mechanism, or in form of a flexure rod which cajn be deformed by an eccentric mechanism. Such a cam mechanism for the bending device is also quite costly and, above all, it cannot be regulated while the machine is running.
The German Application 23 14 302 and the German Patent 11 75 695 describe devices for deforming the leading sheet edge for the purpose of correcting the register, in said devices the gripper bridge shaft is subdivided and the neighbouring ends of the shaft segments are mounted in a movable slide which can be adjusted by means of specific structural members. These devices, too, are very expensive and cannot be adjusted while the machine is running.
Reference is also made to the known possibility of adjusting respectively gripper pad bars and front stops provided at the grippers of sheet transfer cylinders for the purpose of deform-ing the leading sheet edge according to the German Patent 19 09 795 and the German Offenlegungsschrift 35 04 435. By means of the devices known from these publications the leading sheet edge is deformed in a sheet feed cylinder already during the alignment of the sheet at the gripper pad bar and the front stops of the grippers, respectively, thus abutting uniformly against said gripper pad bars and front stops, respectively.
~D
However, these means which are designed so as to differ from the prior art described above do not eliminate the aforementioned disadvantages.
All prior art arrangements share the feature that the means for deforming the leading sheet edge are provided at a rotatingly driven cylinder including a gripper system which is disposed in an axial channel at the circumference of this cylinder and can be swivelled about a gripper bridge shaft mounted eccentrically with respect to the cylinder axis.
Thus, practice and literature point out unequivocally that the embodiment of such means is limited to rotatlng cylinders and that an expensive production has to be accepted without having the possibility of a simple adjustment of the means while the machine is running.
It is the object of the invention to create a bending device for deforming the leading sheet edge for the purpose of correcting the register and compensating for distorted sheets in a gripper system for taking over sheets in a sheet-fed rotary printing machine, a bending device which can be adjusted above all while the machine is running and which requires hardly any additional structural members.
The present invention includes a bending device provided at the gripper bridge of a pre-gripper which executes swinging movements about an axis which is stationary with respect to the machine frame but possibly adjustable with respect to its position and the gripper bridge of which, by means of flexurally stiff levers, is supported only at its two ends on a gripper bridge shaft. The bending device has a stop which is fixed to the machine frame but can still be ~' adjusted with respect to its height and against which the middle region of the gripper bridge abuts before the ends of the gripper bridge which swivel further back reach their zero position in which the sheet grippers grip the sheet. Since the stop is pro-vided at a part of the machine frame, it can be adjusted any time - even when the machine is running. This constitutes an essential advantage as compared to any known prior art embodiment. Further-more, the simplest embodiment of the stop can consist of an ad-justing screw which can be screwed into a threaded part stationar-ily fastened to the machine frame. In general, end stops for the gripper bridge are not necessary; however, it is possible to provide at the machine frame also stops for the ends of the grip-per bridge against which the gripper bridge possibly abut in its zero position. If the middle stop for the gripper bridge is with-drawn behind the straight connection line between the two end stops, the bending device will be ineffective. In case a register correction should possibly be necessary, the middle stop is ad-vanced with respect to the straight connection line so that the middle of the gripper bridge already abuts against this stop before the ends of the gripper bridge reach their zero position and the outer stops, respectively, so that the gripper bridge is slightly bent in the region of the middle stop. Such a gripper bridge operates with gripper pad bars which do not feature any stops so that, with the bending device being adjusted, the sheet projects at its ends further into the grippers than at its middle and that first of all, for the purpose of tensioning the sheet during pre-gripper motion, the sides of the sheet are accelerated more than is its middle, as in the case of other known devices.
In the simplest embodiment the stop for the middle region of the gripper bridge is provided at a cross-bar of the machine frame.
According to a conception for a further embodimènt of the inven-tion the middle stop for the gripper bridge is supported on the gripper bridge shaft in order to permit a delay of several swivel degrees. For this purpose there is provided, according to a par-o -2~00730 ticular suggestion of the invention, a stop in form of a roller mounted on a further lever which is firmly connected with the gripper bridge, provided in the middle between the two flexurally stiff levers disposed at the ends of the gripper bridge and ex-tends approximately parallelly to the two flexurally stiff levers, said lever featuring a self-aligning bearing which is connected with the gripper bridge shaft so as to be fixed against rotation and which is arranged eccentrically with respect to the axis of the gripper bridge shaft. The distance of this roller from the gripper bridge shaft can be adjusted by means of a cam embodied at the circumference of a ring which is rotatable about the gripper bridge shaft. According to the invention a particularly advanta-geous solution is to be seen in the fact that the cam is provided at the outer cylindrical surface of a ring surrounding the gripper bridge shaft, the position of rotation of said ring being adjust-able by means of an adjusting device, e.g. an adjusting screw, which is attached to the machine frame. With the device not being adjusted, the roller is not in contact with the cam, and the lever is pressed against the stop screw by means of a spring.
The drawings show specimen embodiments of the invention:
Fig. 1 shows a vertical sectional view of a pre-gripper of a sheet-fed rotary printing machine, Fig. 2 is a plan view of a pre-gripper in direction of arrow X in Fig. 1, Fig. 3 is a vertical sectional view of a pre-gripper of a modi-fied specimen embodiment as compared to Fig. 1, Fig. 4 is a plan view of the pre-gripper according to Fig. 3 in direction of arrow X in Fig. 3.
.
2(~00730 The pre-gripper shown in the drawing grips the sheet 1 to be printed from the feed table 2 on which the sheet has been aligned at front and side lays (not illustrated). The pre-gripper acceler-ates the sheet 1 to print speed and transfers it to the transfer cylinder 3. The drive of the pre-gripper is effected by a cam 4 (illustrated in Fig. 1) via a roller lever 5 with a roller 6 being mounted at its free end so as to be rotatable, said roller 6 being pressed against the cam 4 by means of a spring 7. By designing the cam 4 correspondingly the sheet is accelerated to print speed by the pre-gripper when being transferred to the cylinder 3, while the pre-gripper returns slowly to its other end position after a respective delay in the last phase of motion and reaches its zero position in which a new sheet 1 is taken from the feed table 2.
In the specimen embodiment of Fig. 1 a gripper bridge 8 which extends across the machine width and is u-shaped in cross-section is fastened at its ends to flexurally stiff levers 9 which, in turn, are attached to the swivel shaft 10 of the pre-gripper. The bending device for the gripper bridge 8 consists of a stop 12 which is adjustably arranged at a cross-bar 11 of the machine frame, said stop 12 cooperating with a counter-stop 13 provided at the gripper bridge 8. In this specimen embodiment the stop 12 is designed as an adjusting screw 14 which can be screwed into the cross-bar 11 extending transversely to the sheet-conveying direc-tion or into another structural member of the machine frame, for this purpose the free end of the adjusting screw 14 is connected with a knurled head or means for using a tool which e.g. can be driven by a motor. Further possibly adjustable stops 15 and 16 are disposed in the region of the ends of the gripper bridge 8 and cooperate with counter-stops 17 and 18 provided at the gripper bridge, whereby - in the simplest case - "mushroom heads" are used as stops 15 and 16 and screw heads as counter-stops 17 and 18.
With this arrangement the stop 12 can be withdrawn by the adjust-ing scew 14 behind the straight connection line extending through the planes in which the stops 15 and 16 are in contact with the counter-stops 17 and 18 so that there is no bending of the gripper o a~
bridge 8. For register corrections the stop 12 can be advanced, while the machine is running, beyond this straight connection line by actuating the adjusting screw 14 so that the gripper bridge 8 is slightly bent at a varying degree, as shown by the dash-dot lines in Fig. 2. Depending on the degree of bending the grip-pers Z0 in the gripper bridge 8 which can be moved about their swivel axis 19 grip the sheet further down in the margin than they do in the middle so that during the pre-gripper motion there is a greater acceleration at the margin, whereby the sheet is tensioned.
Another specimen embodiment is represented in Figs. 3 and 4 in which the stop is formed by a roller 21 which is supported on the cam 24 by a spring 31 and is mounted on a further lever 22 so as to be freely rotatable, said lever 22 being provided in the middle between the two flexurally stiff levers disposed at the ends of the gripper bridge 8 and extending approximately parallely to said flexurally stiff levers, one end of said lever being firmly con-nected with the gripper bridge 8 and the other end of which featuring a self-aligning bearing 23 which is connected with a gripper bridge shaft 10 so as to be fixed against rotation and being provided eccentrically with respect to the axis of said gripper bridge shaft. Since the roller 21 is adjustable with respect to its distance from the axis of the gripper bridge shaft 10, a bending device is provided by means of which the gripper bridge 8 can be deformed via the lever 22. For adjusting the distance of the roller 21 from the axis of the gripper bridge shaft 10 the specimen embodiment provides a cam 24 which is em-bodied at the circumference of a ring 25 being rotatable about the axis of the gripper bridge shaft 10. This ring 25 can be rotated by means of an adjusting screw Z6 which is held in the machine frame so as not to be axially displaceable and the nut 27 of which is connected with the ring Z5 so as to be able rotatable within said ring. By means of this adjusting screw 26 the cam 24 can be rotated into the region of the roller 21 acting as a stop so that, with the swivelling back of the gripper bridge, the roller 21 abuts earlier against the cam 24, thus deforming the gripper o bridge. With the bending device not being adjusted, the cam 24 is moved out of the range of motion of the roller 21 as illustrated in Fig. 3. The lever 22 the middle of which is connected with the gripper bridge 8 cooperates with a further stop lever 28 provided on the gripper bridge shaft 10 so as to be fixed against rotation.
In this lever 28 and in the lever 22 there is provided an adjust-able stop screw 29 and 30, respectively, the heads of which are in contact with each other and which can be set at a tension-free zero position of the gripper bridge. With the bending device not being adjusted, the two heads of the two screws 29 and 30 are held together by ~eans of a spring 31.
o o LISt OF REFERENCES
1 sheet 2 feed table 3 sheet transfer cylinder 4 cam lever - 6 roller 7 spring 8 gripper bridge 9 lever gripper bridge shaft 11 cross-bar at the machine frame 12 stop 13 counter-stop adjusting screw stop 16 stop 17 counter-stop 18 counter-stop 19 gripper shaft sheet gripper 21 roller 22 lever 23 ' self-aligning bearing 24 cam ring 26 adjusting screw 27 nut 28 lever 29 screw - 30 screw 31 spring o o co
The German Application 23 14 302 and the German Patent 11 75 695 describe devices for deforming the leading sheet edge for the purpose of correcting the register, in said devices the gripper bridge shaft is subdivided and the neighbouring ends of the shaft segments are mounted in a movable slide which can be adjusted by means of specific structural members. These devices, too, are very expensive and cannot be adjusted while the machine is running.
Reference is also made to the known possibility of adjusting respectively gripper pad bars and front stops provided at the grippers of sheet transfer cylinders for the purpose of deform-ing the leading sheet edge according to the German Patent 19 09 795 and the German Offenlegungsschrift 35 04 435. By means of the devices known from these publications the leading sheet edge is deformed in a sheet feed cylinder already during the alignment of the sheet at the gripper pad bar and the front stops of the grippers, respectively, thus abutting uniformly against said gripper pad bars and front stops, respectively.
~D
However, these means which are designed so as to differ from the prior art described above do not eliminate the aforementioned disadvantages.
All prior art arrangements share the feature that the means for deforming the leading sheet edge are provided at a rotatingly driven cylinder including a gripper system which is disposed in an axial channel at the circumference of this cylinder and can be swivelled about a gripper bridge shaft mounted eccentrically with respect to the cylinder axis.
Thus, practice and literature point out unequivocally that the embodiment of such means is limited to rotatlng cylinders and that an expensive production has to be accepted without having the possibility of a simple adjustment of the means while the machine is running.
It is the object of the invention to create a bending device for deforming the leading sheet edge for the purpose of correcting the register and compensating for distorted sheets in a gripper system for taking over sheets in a sheet-fed rotary printing machine, a bending device which can be adjusted above all while the machine is running and which requires hardly any additional structural members.
The present invention includes a bending device provided at the gripper bridge of a pre-gripper which executes swinging movements about an axis which is stationary with respect to the machine frame but possibly adjustable with respect to its position and the gripper bridge of which, by means of flexurally stiff levers, is supported only at its two ends on a gripper bridge shaft. The bending device has a stop which is fixed to the machine frame but can still be ~' adjusted with respect to its height and against which the middle region of the gripper bridge abuts before the ends of the gripper bridge which swivel further back reach their zero position in which the sheet grippers grip the sheet. Since the stop is pro-vided at a part of the machine frame, it can be adjusted any time - even when the machine is running. This constitutes an essential advantage as compared to any known prior art embodiment. Further-more, the simplest embodiment of the stop can consist of an ad-justing screw which can be screwed into a threaded part stationar-ily fastened to the machine frame. In general, end stops for the gripper bridge are not necessary; however, it is possible to provide at the machine frame also stops for the ends of the grip-per bridge against which the gripper bridge possibly abut in its zero position. If the middle stop for the gripper bridge is with-drawn behind the straight connection line between the two end stops, the bending device will be ineffective. In case a register correction should possibly be necessary, the middle stop is ad-vanced with respect to the straight connection line so that the middle of the gripper bridge already abuts against this stop before the ends of the gripper bridge reach their zero position and the outer stops, respectively, so that the gripper bridge is slightly bent in the region of the middle stop. Such a gripper bridge operates with gripper pad bars which do not feature any stops so that, with the bending device being adjusted, the sheet projects at its ends further into the grippers than at its middle and that first of all, for the purpose of tensioning the sheet during pre-gripper motion, the sides of the sheet are accelerated more than is its middle, as in the case of other known devices.
In the simplest embodiment the stop for the middle region of the gripper bridge is provided at a cross-bar of the machine frame.
According to a conception for a further embodimènt of the inven-tion the middle stop for the gripper bridge is supported on the gripper bridge shaft in order to permit a delay of several swivel degrees. For this purpose there is provided, according to a par-o -2~00730 ticular suggestion of the invention, a stop in form of a roller mounted on a further lever which is firmly connected with the gripper bridge, provided in the middle between the two flexurally stiff levers disposed at the ends of the gripper bridge and ex-tends approximately parallelly to the two flexurally stiff levers, said lever featuring a self-aligning bearing which is connected with the gripper bridge shaft so as to be fixed against rotation and which is arranged eccentrically with respect to the axis of the gripper bridge shaft. The distance of this roller from the gripper bridge shaft can be adjusted by means of a cam embodied at the circumference of a ring which is rotatable about the gripper bridge shaft. According to the invention a particularly advanta-geous solution is to be seen in the fact that the cam is provided at the outer cylindrical surface of a ring surrounding the gripper bridge shaft, the position of rotation of said ring being adjust-able by means of an adjusting device, e.g. an adjusting screw, which is attached to the machine frame. With the device not being adjusted, the roller is not in contact with the cam, and the lever is pressed against the stop screw by means of a spring.
The drawings show specimen embodiments of the invention:
Fig. 1 shows a vertical sectional view of a pre-gripper of a sheet-fed rotary printing machine, Fig. 2 is a plan view of a pre-gripper in direction of arrow X in Fig. 1, Fig. 3 is a vertical sectional view of a pre-gripper of a modi-fied specimen embodiment as compared to Fig. 1, Fig. 4 is a plan view of the pre-gripper according to Fig. 3 in direction of arrow X in Fig. 3.
.
2(~00730 The pre-gripper shown in the drawing grips the sheet 1 to be printed from the feed table 2 on which the sheet has been aligned at front and side lays (not illustrated). The pre-gripper acceler-ates the sheet 1 to print speed and transfers it to the transfer cylinder 3. The drive of the pre-gripper is effected by a cam 4 (illustrated in Fig. 1) via a roller lever 5 with a roller 6 being mounted at its free end so as to be rotatable, said roller 6 being pressed against the cam 4 by means of a spring 7. By designing the cam 4 correspondingly the sheet is accelerated to print speed by the pre-gripper when being transferred to the cylinder 3, while the pre-gripper returns slowly to its other end position after a respective delay in the last phase of motion and reaches its zero position in which a new sheet 1 is taken from the feed table 2.
In the specimen embodiment of Fig. 1 a gripper bridge 8 which extends across the machine width and is u-shaped in cross-section is fastened at its ends to flexurally stiff levers 9 which, in turn, are attached to the swivel shaft 10 of the pre-gripper. The bending device for the gripper bridge 8 consists of a stop 12 which is adjustably arranged at a cross-bar 11 of the machine frame, said stop 12 cooperating with a counter-stop 13 provided at the gripper bridge 8. In this specimen embodiment the stop 12 is designed as an adjusting screw 14 which can be screwed into the cross-bar 11 extending transversely to the sheet-conveying direc-tion or into another structural member of the machine frame, for this purpose the free end of the adjusting screw 14 is connected with a knurled head or means for using a tool which e.g. can be driven by a motor. Further possibly adjustable stops 15 and 16 are disposed in the region of the ends of the gripper bridge 8 and cooperate with counter-stops 17 and 18 provided at the gripper bridge, whereby - in the simplest case - "mushroom heads" are used as stops 15 and 16 and screw heads as counter-stops 17 and 18.
With this arrangement the stop 12 can be withdrawn by the adjust-ing scew 14 behind the straight connection line extending through the planes in which the stops 15 and 16 are in contact with the counter-stops 17 and 18 so that there is no bending of the gripper o a~
bridge 8. For register corrections the stop 12 can be advanced, while the machine is running, beyond this straight connection line by actuating the adjusting screw 14 so that the gripper bridge 8 is slightly bent at a varying degree, as shown by the dash-dot lines in Fig. 2. Depending on the degree of bending the grip-pers Z0 in the gripper bridge 8 which can be moved about their swivel axis 19 grip the sheet further down in the margin than they do in the middle so that during the pre-gripper motion there is a greater acceleration at the margin, whereby the sheet is tensioned.
Another specimen embodiment is represented in Figs. 3 and 4 in which the stop is formed by a roller 21 which is supported on the cam 24 by a spring 31 and is mounted on a further lever 22 so as to be freely rotatable, said lever 22 being provided in the middle between the two flexurally stiff levers disposed at the ends of the gripper bridge 8 and extending approximately parallely to said flexurally stiff levers, one end of said lever being firmly con-nected with the gripper bridge 8 and the other end of which featuring a self-aligning bearing 23 which is connected with a gripper bridge shaft 10 so as to be fixed against rotation and being provided eccentrically with respect to the axis of said gripper bridge shaft. Since the roller 21 is adjustable with respect to its distance from the axis of the gripper bridge shaft 10, a bending device is provided by means of which the gripper bridge 8 can be deformed via the lever 22. For adjusting the distance of the roller 21 from the axis of the gripper bridge shaft 10 the specimen embodiment provides a cam 24 which is em-bodied at the circumference of a ring 25 being rotatable about the axis of the gripper bridge shaft 10. This ring 25 can be rotated by means of an adjusting screw Z6 which is held in the machine frame so as not to be axially displaceable and the nut 27 of which is connected with the ring Z5 so as to be able rotatable within said ring. By means of this adjusting screw 26 the cam 24 can be rotated into the region of the roller 21 acting as a stop so that, with the swivelling back of the gripper bridge, the roller 21 abuts earlier against the cam 24, thus deforming the gripper o bridge. With the bending device not being adjusted, the cam 24 is moved out of the range of motion of the roller 21 as illustrated in Fig. 3. The lever 22 the middle of which is connected with the gripper bridge 8 cooperates with a further stop lever 28 provided on the gripper bridge shaft 10 so as to be fixed against rotation.
In this lever 28 and in the lever 22 there is provided an adjust-able stop screw 29 and 30, respectively, the heads of which are in contact with each other and which can be set at a tension-free zero position of the gripper bridge. With the bending device not being adjusted, the two heads of the two screws 29 and 30 are held together by ~eans of a spring 31.
o o LISt OF REFERENCES
1 sheet 2 feed table 3 sheet transfer cylinder 4 cam lever - 6 roller 7 spring 8 gripper bridge 9 lever gripper bridge shaft 11 cross-bar at the machine frame 12 stop 13 counter-stop adjusting screw stop 16 stop 17 counter-stop 18 counter-stop 19 gripper shaft sheet gripper 21 roller 22 lever 23 ' self-aligning bearing 24 cam ring 26 adjusting screw 27 nut 28 lever 29 screw - 30 screw 31 spring o o co
Claims (20)
1. Device for correcting the register of sheet prints and for compensating for distorted sheets in a sheet-fed rotary printing machine by deforming the leading sheet edge before a printing unit, said device comprising an adjustable bending device which, in rhythm with a printing cycle of the printing machine, bends a cross-bar on which there are provided adjacent sheet grippers, said cross-bar extending transversely to the travel direction of the sheet, said bending device cooperating with a pre-gripper executing swinging movements respectively about a stationary axis and about an axis which can be adjusted into fixed positions, said pre-gripper comprising a gripper bridge (8) which also forms the cross-bar for the sheet grippers, said gripper bridge having ends which are supported on a gripper bridge shaft (10) by means of two flexurally stiff levers (9); said bending device including at least one adjustable stop (12, 21) which is fixed to a frame (11) of the printing machine and against which the gripper bridge (8) abuts at a position approximately midway between said two flexurally stiff levers (9), said gripper bridge (8) engaging said adjustable stop when said gripper bridge is swivelled back and before the ends of said gripper bridge have reached a zero position where said sheet grippers engage a sheet.
2. Device for correcting the register according to claim 1, characterized in that the stop (12) for the gripper bridge (8) is arranged at a cross-bar (11) of the machine frame.
3. Device for correcting the register according to claim 1, characterized in that additional stops (15, 16) for the ends of the gripper bridge (8) are provided at the machine frame and that with respect to a straight connection line between the additional stops (15, 16) at the ends of the gripper bridge (8), the at least one adjustable stop (12) is protuberant and adjustable in the travel direction of the sheet.
4. Device for correcting the register according to claim 2, characterized in that the at least one adjustable stop (12) is embodied at an adjusting screw (14) which can be screwed into the cross-bar (11) of the frame.
5. Device for correcting the register according to claim 3, characterized in that the additional stops (15, 16) for the ends of the gripper bridge (8) are designed so as to be adjustable generally in the travel direction of the sheet.
6. Device for correcting the register according to claim 1, characterized in that the at least one adjustable stop consists of a roller (21) which is supported on the gripper bridge shaft (10) and which can be adjusted with respect to the axis of the gripper bridge shaft.
7. Device for correcting the register according to claim 6, characterized in that the roller (21) is mounted on a further lever (22) which is firmly connected with the gripper bridge (8), which is provided in the middle between the two flexurally stiff levers (9) disposed at the ends of the gripper bridge and extends approximately parallel to said flexurally stiff levers, said lever (22) featuring a self-aligning bearing (23) which is connected with the gripper bridge shaft (10) so as to be fixed against rotation and which is arranged eccentrically with respect to the axis of said gripper bridge shaft.
8. Device for correcting the register according to claim 6, characterized in that the roller (21) is adjustable with respect to its distance from the gripper bridge shaft (10) by means of a cam (24) embodied at the circumference of a ring (25) which is rotatable about the gripper bridge shaft (10).
9. Device for correcting the register according to claim 8, characterized in that the ring (25) is connected with an adjusting screw (26) which is fixed to the machine frame so as not to be axially displaceable.
10. Device for correcting the register according to one of the claims 7 through 9, characterized in that the further lever (22) is firmly connected with the gripper bridge (8) at a middle position of said further lever, said further lever cooperating with a stop lever (28) which is fixed to the frame and which can be set at a tension free zero position of the gripper bridge (8).
11. Device for correcting the register of a sheet-over-print and for compensating for a distorted sheet in a sheet-fed rotary printing machine by deforming the leading edge of the sheet on a travel path thereof before the leading edge enters a printing unit, including an adjustable bending device for bending, in rhythm with a printing cycle of the machine, a cross bar extending transversely to the travel path of the sheet and carrying a plurality of mutually adjacent sheet grippers, comprising a pre-gripper device for executing swinging movements about a stationary axis and an axis adjustable into a given position, respectively, said pre-gripper device including a gripper bridge forming the cross bar for the sheet grippers, and respective rigid levers supporting said gripper bridge at least at both ends thereof on a gripper bridge shaft, the bending device being cooperatively engageable with said pre-gripper device and being formed of a single adjustable deforming stop disposed substantially midway between the respective ends of said gripper fly and fixed to a frame of the machine, the bending device and said pre-gripper device, except for the sheet gripper thereof, being located below the sheet travel path, said gripper bridge, at a substantially midwise location thereof between said levers, being deformably engageable with said single adjustable deforming stop before said ends of said gripper bridge, during a return swing thereof, have reached a zero setting in which the sheet grippers take over a sheet.
12. Register-correcting device according to claim 11, wherein said single adjustable deforming stop for said gripper bridge is disposed on a cross member of the machine frame.
13. Register-correcting device according to claim 12, wherein said single adjustable deforming stop is formed on a setscrew threadedly secured on said cross member.
14. Register-correcting device according to claim 11, including additional stops fixed to the machine frame for engaging said ends of said gripper bridge on a rectilinear connecting line, said single adjustable deforming stop being adjustable in a travel direction of the sheet along said travel path thereof so as to project beyond said rectilinear connecting line.
15. Register-correcting device according to claim 14, wherein said additional stops are adjustable to positions on said rectilinear connecting line.
16. Register-correcting device according to claim 11, wherein said one adjustable stop is formed as a roller braced against said gripper bridge shaft and adjustable in spacing from the axis of said gripper bridge shaft.
17. Register-correcting device according to claim 16, including another lever firmly connected at an end thereof to said gripper bridge and extending substantially parallel to and midwise between said rigid levers disposed at said ends of said gripper bridge, said other lever at the other end thereof having a self-aligning bearing disposed eccentrically to said axis of said gripper bridge shaft and connected to said gripper bridge shaft so as to be fixed against rotation relative thereto, said roller forming said one adjustable stop being mounted on said other lever.
18. Register-correcting device according to claim 16, including a ring turnably mounted on said gripper bridge shaft, a cam formed at the periphery of said ring, said roller forming said one adjustable stop being engageable with said cam and adjustable thereby in spacing from said gripper bridge shaft.
19. Register-correcting device according to claim 18, including an adjusting screw secured to the machine frame so as to be fixed against displacement in axial direction, said ring being connected to said adjusting screw.
20. Register-correcting device according to claim 17, including a stop lever fixed to the machine frame and adjustable to a tension-free zero setting of said gripper bridge, said other lever being cooperatively engageable with said stop lever.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3840870 | 1988-12-03 | ||
| DEP3840870.8 | 1988-12-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2000730A1 CA2000730A1 (en) | 1990-06-03 |
| CA2000730C true CA2000730C (en) | 1995-01-31 |
Family
ID=6368455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002000730A Expired - Fee Related CA2000730C (en) | 1988-12-03 | 1989-10-16 | Device for correcting the register of sheet prints in a sheet-fed rotary printing machine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0372237B1 (en) |
| JP (1) | JPH02200438A (en) |
| CN (1) | CN1013261B (en) |
| CA (1) | CA2000730C (en) |
| DE (2) | DE8816641U1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4131887C1 (en) * | 1991-09-25 | 1993-01-07 | Man Roland Druckmaschinen Ag, 6050 Offenbach, De | |
| JP3339515B2 (en) * | 1993-08-12 | 2002-10-28 | 株式会社小森コーポレーション | Paper transport device for sheet-fed printing press |
| DE9409890U1 (en) * | 1994-06-18 | 1994-08-04 | Heidelberger Druckmaschinen Ag, 69115 Heidelberg | Device for register correction on sheet-fed rotary printing machines |
| DE4434624C2 (en) * | 1994-09-28 | 1997-11-20 | Heidelberger Druckmasch Ag | Device for register correction and to compensate for tensioned sheets in the feeder of a sheet-fed rotary printing machine |
| DE19503739C1 (en) * | 1995-02-04 | 1996-04-04 | Heidelberger Druckmasch Ag | Registration error prevention device for pre=gripper of chain gripper bar |
| DE19611124B4 (en) * | 1996-03-21 | 2012-07-26 | Heidelberger Druckmaschinen Ag | Sheet transfer device of a sheet-fed rotary printing machine |
| CN1084253C (en) * | 1999-01-19 | 2002-05-08 | 李青安 | Automatic quick paper feeding system without gripping paper device |
| EP1031418B1 (en) * | 1999-02-26 | 2003-07-30 | Komori Corporation | Sheet-like object conveying apparatus for sheet-fed rotary printing press |
| CH693951A5 (en) * | 2000-03-08 | 2004-05-14 | Bobst Sa | Device for the longitudinal alignment of plate-like members in an infeed station of a machine processing them. |
| JP4496132B2 (en) * | 2005-06-08 | 2010-07-07 | アキヤマインターナショナル株式会社 | Swing device for multicolor printing sheet offset printing machine |
| CN101412296B (en) * | 2007-10-18 | 2011-02-16 | 李青安 | Die-cutting mark press (or thermoprinting machine) with paper holding and locating at the feed portion and one time paper-push-paper movement |
| DE102008060291B4 (en) | 2007-12-13 | 2022-09-01 | Heidelberger Druckmaschinen Ag | Sheet acceleration system for a sheet-fed printing press |
| CN103979328A (en) * | 2014-05-22 | 2014-08-13 | 邱浩 | Gripper-bar paper feeder of die-cutting machine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2577099A (en) * | 1946-06-14 | 1951-12-04 | Hoe & Co R | Method of and means for registering impressions in multiunit sheet printing machines |
| DE1079077B (en) * | 1956-12-07 | 1960-04-07 | Schnellressenfab Heidelberg | Sheet feeder for sheet processing machines, especially printing machines, with feed marks that can be pushed back and forth |
| CA936185A (en) * | 1970-08-26 | 1973-10-30 | North American Rockwell Corporation | Means for overcoming fan-out in lithographic press |
| DE2052786A1 (en) * | 1970-10-28 | 1972-05-04 | North American Rockwell Corp , (n d Ges d Staates Delaware), Pitts burgh, Pa (V St A) | Sheet feeding device for printing machines |
| JPS5935042B2 (en) * | 1977-09-26 | 1984-08-27 | 株式会社写研 | Positioning method in phototypesetting machines and similar machines |
| DE3504435A1 (en) * | 1985-02-09 | 1986-08-14 | Miller-Johannisberg Druckmaschinen Gmbh, 6200 Wiesbaden | BOW PRINTING MACHINE WITH BOWING SYSTEM ON A PRINTING MACHINE CYLINDER |
-
1988
- 1988-12-03 DE DE8816641U patent/DE8816641U1/en not_active Expired - Lifetime
-
1989
- 1989-10-16 CA CA002000730A patent/CA2000730C/en not_active Expired - Fee Related
- 1989-11-06 DE DE58909200T patent/DE58909200D1/en not_active Expired - Fee Related
- 1989-11-06 EP EP89120537A patent/EP0372237B1/en not_active Expired - Lifetime
- 1989-12-01 JP JP1310816A patent/JPH02200438A/en active Pending
- 1989-12-02 CN CN89108929A patent/CN1013261B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0372237A2 (en) | 1990-06-13 |
| DE8816641U1 (en) | 1990-01-25 |
| CN1013261B (en) | 1991-07-24 |
| CA2000730A1 (en) | 1990-06-03 |
| EP0372237A3 (en) | 1990-10-10 |
| JPH02200438A (en) | 1990-08-08 |
| DE58909200D1 (en) | 1995-06-01 |
| CN1043107A (en) | 1990-06-20 |
| EP0372237B1 (en) | 1995-04-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |