JPH09248896A - Axial direction movement adjusting device for guide element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the axial direction adjustment of a plurality of guide elements by releasing clamps attached to the guide elements rotating on the positioning points on which stationed guide elements are rocked, connecting both guide elements together and moving the guide elements together in the axial direction. SOLUTION: Guide rollers 4 as stationed guide elements can be rocked on three positions, I, II and III, and the position I corresponds to the operation position in the perfect printing operation manner, and in that case the guide rollers 4 are brought into contact with sheets 10 by an impression cylinder 1. The position II corresponds to stop positions II in the single printing operation manner, and the guide rollers 4 are lifted from the impression cylinder 1 on the stop position II. The position III of the guide rollers 4 corresponds to the original positioning points III, and levers 6 of the guide roller 4 are brought into contact with a guide belt plate 3 of a transfer cylinder 2 on the positioning point III through a clamp. Also a motorized slide device for adjusting the movement in the axial direction of guide elements 3 and 4 together is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for axially adjusting a guide element in a cylinder of a printing machine which can be selectively used for single-sided printing or double-sided printing.

[0002]

Guide elements, such as guide rollers or guide strips, have the purpose of supporting the guidance of sheets in a printing press. It is necessary to prevent the sheet of paper from being contaminated by the guide elements, especially when processing flexurally rigid materials.

The guiding element further comprises a sheet-cylinder end of the impression cylinder to ensure that the sheet-sheet edge is sucked in the correct position by the suction device at the contact point between two adjacent cylinders during duplex printing. It has the purpose of being placed exactly on top.

In a printing machine in which the sheet paper can be selectively switched from single-sided printing to double-sided printing and the sheet paper is inverted based on the trailing edge inversion principle, a switching operation in the guide element must be performed when the operation mode is changed.

A guide element consisting of a guide strip arranged on a transfer cylinder (sheet guide cylinder) which is designed as a reversing drum is known from DD (East Germany) 225 103. In this document, the guide strip consists of an elastic hollow profile which is attached to the drum cap of the transfer cylinder by means of a clamping device. The guide strips are moved laterally with respect to the transfer cylinder by the release of the tightening device and are adjusted to a blank line in the print face. This adjustment has the drawback of requiring a cumbersome manual operation.

In DE-A 42 10 432, a guide element device is known, which is composed of guide rollers and is attached to an impression cylinder which is arranged in front of the transfer cylinder. The guide rollers come into contact with the impression cylinder in the double-sided operating mode and thus ensure that the sheet is in close contact with the impression cylinder and that the suction device of the transfer cylinder ensures that the rear part of the sheet is sucked for reversing purposes. In the one-sided printing mode, the guide rollers are moved away from the impression cylinder, i.e. disabled.

In order to prevent the guide roller from damaging the printing surface on the sheet in the double-sided printing mode, the guide roller can be adjusted axially on a blank line. In the above specification it can be clearly seen how the switching of the guide rollers from single-sided printing to double-sided printing or vice versa is understood, but here the axial movement adjustment of the guide rollers is completely described. Not not.

[0008]

SUMMARY OF THE INVENTION It is an object of the invention, starting from the prior art, to simplify the axial movement adjustment of a plurality of guide elements.

[0009]

According to the invention, this object is achieved by means of the subclaims.

The device according to the invention has the advantage that a plurality of guide elements with different functions and working places can be adjusted axially together by simple means. In an advantageous manner, for example, a guide strip rotating with the transfer cylinder and a lever with guide rollers arranged on a crossbar supported on the side wall are connected together for the purpose of axial movement and are moved axially. (Adjusted) and separated again after switching operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in the drawings.

FIG. 1 shows a side view of a guide element device for an impression cylinder 1 and a transfer cylinder 2 in a printing machine which can be selectively used for single-sided printing or double-sided printing, as is known from DD patent 54703, for example. It is shown in the figure. The impression cylinder 1 and the transfer cylinder 2 have twice the diameter of other cylinders.

The guide elements (see FIG. 1) consist of a guide strip 3 attached to and rotating with the transfer cylinder 2 and a stationary (non-rotating) guide roller 4 attached to the impression cylinder 1. The guide roller 4 is supported via a lever 6 on a control shaft 5 (crossbar) so as to be relatively non-rotatable.
A plurality of guide rollers 4 are mounted on the control shaft 5 across the width of the impression cylinder 1.

The control shaft 5 is rotatably supported on the side wall 7 of the printing press. A lever 8 with a roller is fixedly arranged on the control shaft 5, the cam roller 11 of which is attached to a control cam 9 which is connected to the impression cylinder 1 and rotates with it in the double-sided printing mode. The contact between the cam roller 11 and the control cam 9 is performed by a spring 16 that pulls the lever 8 with roller toward the control cam 9.

The guide roller 4 has three positions I, II and II.
Can swing to I.

Position I corresponds to the operating position in the duplex printing mode. In this case, the guide roller 4 is in contact with the impression cylinder 1 and thus the sheet paper 10. The guide roller 4 is cyclically lifted above the impression cylinder channel (Druckzylinderkanal). The guide roller 4 is a stationary guide element 4.

Position II corresponds to rest position II in the single-sided printing mode (see FIG. 1). The guide roller 4 is lifted from the impression cylinder 1 in the rest position II.
Therefore, the guide roller 4 does not function at all in single-sided printing.

The position III of the guide roller 4 corresponds to the original positioning position III. This positioning position III
In, the lever 6 of the guide roller 4 is in contact with the guide strip 3 of the transfer cylinder 2 via the clamp 15. For this reason, it is necessary to forcibly move the transfer cylinder 2, and hence the impression cylinder 1, to a predetermined angular position. In this position the drive of the printing press is stopped by limit switches, as is known.

In this embodiment, the guide roller 4 and thus the lever 6 are controlled from position I (double-sided printing) to position II (rest position) and / or positioning position III (swing) and vice versa (swing). First, it is carried out by a cylinder 17 fixedly arranged on the side wall 7 and acting toward the lever 8 with the roller.

The number of guide strips 3 in the transfer cylinder 2 is equal to that of the impression cylinder 1.
Corresponding to the number of guide rollers 4 attached to the guide strip 4, the guide strips 3 and the guide rollers 4 are aligned with each other in the direction of rotation of the sheet.

Two guide cross bars 13, 13.1 are supported on the end plate 12 of the transfer cylinder 2. A guide strip 3 is supported by these guide crossbars via a holder 14 so as to be movable in the axial direction, and is clamped and fixed to the guide crossbars by a clamp 15 in an operating state (double-sided printing). The clamp 15 comprises a support 18 attached to the guide crossbar 13. A clamp 15 is provided on each guide strip 3. A conical hole 19 in which a compression spring 20 is fitted is provided in the support 18. A conical pin 21 is likewise provided in the conical hole 19, and a compression spring 20 acts on this conical pin 21. The conical pin 21 extends outwardly and beyond the support 18.

The conical hole 19 and thus the conical pin 21 is in contact with the guide crossbar 13. Support 18, conical hole 19,
Compression spring 20, conical pin 21 and guide cross bar 13
Form a clamp 15.

The holder 14 is rigidly arranged on the support 18. The holder 14 also has a guide crossbar 13.
It is also guided by 1. The guide strip 3 is a rotary guide element.

In addition, a motorized slide device (not shown in detail) is provided for axially adjusting the guide elements 3, 4 together.

The device according to the invention operates as follows.

When the printing press is adjusted to the double-sided printing mode or a command change is required in the double-sided printing mode, the transfer cylinder 2 is placed in the corresponding angular position and the drive is stopped. Then, the cylinder 17 is controlled, and the lever 8 with the roller and thus the control shaft 15 with the lever 6 is swung to the positioning position III. In that case, lever 6 is conical pin 2
Since it moves below 1, the engagement between the support 18 and the guide crossbar 13 is released. The guide strip 3 is now moved electrically or manually along the guide crossbar 13 and the guide rollers 4 together along the control shaft 5 and adjusted to a blank line in the print face.

After all the guide elements 3, 4 have been axially adjusted, the cylinder 17 and thus the lever 18 with rollers and the control shaft 5 and thus the lever 6 are returned to position I (duplexing). At the same time, the conical pin 21 is pressed downward by the compression spring 20, so that the support 18 is guided by the guide crossbar 13.
Is locked again.

In the single-sided printing mode, the guide roller 4 is moved into the lateral region of the impression cylinder 1. The guide strip 3 is the transfer cylinder 2
Controlled inside the circumference of.

[Brief description of drawings]

FIG. 1 is a schematic side view of a guide element device in an impression cylinder and a transfer cylinder.

2 is a plan view of the guide element device shown in FIG. 1 in a positioning position.

FIG. 3 is a detailed view of a clamp.

[Explanation of symbols]

 1 impression cylinder 2 transfer cylinder 3 guide strip, rotating guide element 4 guide roller, stationary guide element 5 control shaft, crossbar 6 lever 7 side wall 8 roller lever 9 control cam 10 sheet paper 11 roller 12 end plate 13, 13.1 Guide crossbar 14 Holder 15 Clamp 16 Spring 17 Cylinder 18 Support 19 Conical hole 20 Compression spring 21 Conical pin I Operating position (double-sided printing) II Rest position (single-sided printing) III Positioning position

Claims (3)

[Claims] 1. A guide element which can be selectively used for single-sided or double-sided printing and which rotates with the cylinder and a stationary guide element on a crossbar which is fixed to the machine frame are provided. In a device for axial movement adjustment of guide elements in a printing machine, which is arranged so as to be axially movable and clampable, a stationary guide element (4) can be swung into a positioning position (III), In III) the clamp (5) attached to the rotating guide element (3) is released,
Both guide elements (3, 4) in the positioning position (III)
An axial movement adjusting device for a guide element in a printing press, characterized in that they are connected and can be moved together axially. 2. A rotating guide element (3) on the transfer cylinder (2) is guided via a holder (4) to a guide crossbar (13).
Device according to claim 1, characterized in that it is clamped on and guided. 3. A stationary guide element (4) is arranged on a lever (6), said lever (6) being movably supported on a control shaft (5) such that it cannot rotate relative to it, and the control shaft (5) is a roller. Device according to claim 1, characterized in that it is attached to the control cam (9) via a lever (8) and a cam roller (11).