JP3249707U - Sheet alignment device - Google Patents

Abstract

The present invention provides a device for aligning sheets conveyed in a conveying direction on a sheet feed table, the device including a pneumatic tension rail 12 and a front mark 13. The pneumatic tension rail 12 and the front mark 13 are components of a same assembly 11 movably supported on supports 20, 21, so that when the assembly 11 moves, the front mark 13 is moved together with the pneumatic tension rail 12. [Selected Figure] Figure 2

Description

This invention relates to an apparatus for aligning sheets conveyed in a conveying direction on a sheet feed table, the apparatus including a pneumatic tension rail and a front mark.

Such a sheet alignment device is described in German Patent Application No. 102021118805.

The objective of this invention is to provide another device for aligning sheets transported in the transport direction on a paper feed table.

This problem is solved by an apparatus for aligning sheets transported in a transport direction on a paper feed table, the apparatus including a pneumatic tension rail and a front mark, the pneumatic tension rail and the front mark being components of the same component group, the component group being movably supported on a support section, and the front mark being moved together with the pneumatic tension rail when the component group is moved.

Advantageously, in the device according to the invention, the lateral sheet alignment by the tension rail is always exactly parallel to the front mark.

In one refinement, the component group is supported so as to be movable in and against the conveying direction. In another refinement, the component group is supported so as to be movable in a position inclined to the conveying direction. In another refinement, the support includes a spring. In another refinement, the spring is a leaf spring. In another refinement, the support includes a joint. In another refinement, the joint is a flexible joint.

In one further refinement, the assembly is pressed by a spring against first and second adjustable stops. In one further refinement, the first stop is a first screw and the second stop is a second screw.

In one further refinement, the assembly has a left end as viewed in the conveying direction and a right end as viewed in the conveying direction, with a first stopper disposed at the left end and a second stopper disposed at the right end. In one further refinement, the first stopper is movable by a first motor and the second stopper is movable by a second motor.

In one further refinement, the assembly is supported at its midsection by a swing support.

Further improvements will be apparent from the following description of the embodiments and the accompanying drawings.

FIG. 2 is a three-dimensional view of a sheet alignment device of the sheet feeder shown in FIG. 1 ; FIG. 3 is a plan view of the sheet-regulating device shown in FIG. 2 as seen from above; 3 is a cross-sectional view of the sheet-registration device shown in FIG. 2;

A printing press 1 for offset printing on sheets 2 includes a sheet feeder 3 with a feed table 4 and a sheet alignment device 5. A suction head 6 separates the sheets 2 from a sheet pile 7. The sheets 2 are then transported on the feed table 4 in a conveying direction 8 towards the sheet alignment device 5. The sheet alignment device 5 aligns the sheets 2 one by one. The aligned sheets 2 are transferred to a cylinder 10 of the printing press 1 by a feed device 9, for example a front gripper.

The sheet alignment device 5 comprises a component group 11, to which the tension rail 12, the front mark 13 and the upper mark 14 belong. The tension rail 12 has a suction opening 15 for pneumatically holding each sheet 2. When aligning the sheet 2 laterally, the tension rail 12 holding the sheet 2 performs a tension movement 27 relative to the front mark 13. For the pivoting of the front mark 13 and the upper mark 14, which takes place during the sheet transport cycle, a camshaft 16 is arranged in the component group 11, which is driven via a cardan shaft 17. The component group 11 has a left end 18 and a right end 19, as viewed in the transport direction 8. The left end 18 is located on the operating side of the printing press 1, and the right end 19 is located on the drive side. The structural group 11 is supported on an auxiliary stand 22 at a left end 18 via a first support 20 and at a right end 19 via a second support 21. The support parts 20 and 21 each have a first leaf spring 23 and a second leaf spring 24. The leaf springs 23 and 24 of the support parts 20 and 21 each extend perpendicular to the conveying direction 8 and are offset from each other in the conveying direction 8.

Each leaf spring 23, 24 is attached at one end to the assembly 11 and at the other end to the auxiliary stand 22. Each leaf spring 23, 24 has a middle part reinforced on both sides by a plate 25. Similarly, one-sided reinforcement of each leaf spring 23, 24 by only one plate is also possible. Between the reinforced middle part of each leaf spring 23, 24 and the attached end, there is a non-reinforced part, in particular a spring joint, which forms a flexible joint 26. At the left end 18, the assembly 11 is pressed by a first spring 28 against a first screw 30, and at the right end 19, by a second spring 29 against a second screw 31. The first screw 30 forms a first stop for the assembly 11, which is steplessly adjustable by a first motor 32. The second screw 31 forms a second stop for the component 11, which can be infinitely adjusted by means of a second motor 33. The screws 30, 31 are oriented parallel to their rotation axes in the conveying direction 8. The motors 32, 33 are arranged coaxially with the screws 30, 31, whereby the screws 30, 31 can be formed by the motor shafts of the motors 32, 33 or can be connected to these motor shafts in a manner that prevents them from rotating relative to each other. In the intermediate part of the component 11, which is located between the left end 18 and the right end 19, the component 11 is supported on the platform via a swing support 34, so that deflections of the component 11 are minimized. The supports 20, 21 each have a strut 35, which engages with operating play in a longitudinal groove 36 in the underside of the component 11. This engagement is contactless when the component 11 is normally loaded. Only if excessive load is applied to the structural group 11 will each support column 35 come into supporting contact with the structural group 11 to prevent eventual damage.

By the simultaneous and equal movement of the screws 30, 31 and the corresponding control of the motors 32, 33, the entire component 11, including the tension rail 12 and the marks 13, 14, is moved in the conveying direction 8 or against the conveying direction 8 depending on the direction of rotation of the screws 30, 31. The longitudinal axis of the component 11 then maintains its angle of, for example, 90° to the conveying direction 8. By the movement of the screws 30, 31 at different distances and/or in different directions and the corresponding coordinated control of the motors 32, 33, the component 11, including the tension rail 12 and the marks 13, 14, is moved to a somewhat more highly inclined position. In this case, the angle between the longitudinal axis of the component 11 and the conveying direction 8 is changed, for example, to 87° or 93°.

REFERENCE NUMERALS 1 printing press 2 sheets 3 sheet feeder 4 feed table 5 sheet alignment device 6 suction head 7 sheet pile 8 transport direction 9 feeder 10 cylinder 11 component group 12 pull rail 13 front mark 14 upper mark 15 suction opening 16 camshaft 17 cardan shaft 18 left end 19 right end 20 first support 21 second support 22 auxiliary frame 23 first leaf spring 24 second leaf spring 25 plate 26 flexible joint 27 tension movement 28 first spring 29 second spring 30 first screw 31 second screw 32 first motor 33 second motor 34 swing support 35 strut 36 Longitudinal groove

Claims (12)

1. An apparatus for aligning a sheet (2) conveyed in a conveying direction (8) on a sheet feed table (4), comprising a pneumatic tension rail (12) and a front mark (13),
The pneumatic tension rail (12) and the front mark (13) are components of a single structural group (11), and the structural group (11) is movably supported on supports (20, 21), so that when the structural group (11) is moved, the front mark (13) is moved together with the pneumatic tension rail (12). The device according to claim 1, wherein the component group (11) is supported so as to be movable in the conveying direction (8) and in a direction opposite to the conveying direction (8). The device according to claim 1 or 2, wherein the component group (11) is supported movably in a position inclined with respect to the conveying direction (8). The device according to claim 1 or 2, wherein the support (20, 21) has a spring. The device according to claim 4, wherein the springs are leaf springs (23, 24). The device according to claim 1 or 2, wherein the support (20, 21) has a joint. The device of claim 6, wherein the joint is a flexible joint (26). The device according to claim 1 or 2, wherein the assembly is pressed against the first and second adjustable stops by springs (28, 29). The device according to claim 8, wherein the first stopper and the second stopper are screws (30, 31). The component group (11) has a left end (18) as viewed in the conveying direction (8) and a right end (19) as viewed in the conveying direction (8), and the first stopper is disposed at the left end (18) and the second stopper is disposed at the right end (19).
9. The apparatus of claim 8. The device according to claim 8, wherein the first stopper is movable by a first motor (32) and the second stopper is movable by a second motor (33). The device according to claim 1 or 2, wherein the component group (11) is supported at its intermediate portion by a swing support (34).