JP2786430B2 - Sheet guiding drums for rotary printing presses - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a drum for guiding sheets, comprising one or more grippers which are distributed uniformly around the drum and which can be remotely adjusted to different printing material thicknesses. It relates to a type in which a bridge is used to guide a sheet between a plurality of printing devices of a rotary printing press or a plurality of continuous processing devices for upgrading.

[0002]

2. Description of the Related Art German Patent No. 3,428,668.
From the specification of C2, the adjustment of the gripper claw strips from a central control stand for double and multiple turning drums (where the size of the printing cylinder is 1) is known. Each of the pawls can be individually adjusted by engaging means engaging with the gripper pawls. Position adjusting means for adjusting the gripper pawls as a whole acts on the engaging means. It is operated by a central adjustment device arranged on the drum body. In this case, this central control device is driven by power and controlled from a control console.

[0003] DE 42 33 422 A1 discloses a sheet gripper device for rotary printing presses which guarantees the correct delivery of sheets. In this case, the gripper pawl is guided in a linear guide mechanism so as to be movable in a substantially radial direction and is provided with a roller at its end face, which roller is mounted on the side frame in the sheet transfer area. 1 each fixed
It forms a rolling pair with two corresponding control cams. Via this control cam, the gripper claw strip is moved up and down during the delivery of the sheet.

[0004] Published German Patent Application No. 4337.
No. 578 (A1) discloses a drum for guiding a sheet for a printing press, which is provided with a drive motor fixed to the frame for projecting into the drum journal of the drum. The drive motor, by means of a suitable connection with the central control means, causes the gripper pawl to be moved substantially radially by means of a rust which is thrust by way of the position adjusting device.

[0005] British Patent No. 2098966 (A)
According to the specification, a device is known for adjusting the gripper pawl of a gripper bridge of a sheet guiding cylinder. The adjustment of the position of the gripper pawl according to the thickness of the printing material to be processed is effected by positioning the spring below the gripper pawl, which extends over the entire length of the sheet guide cylinder and in the axial direction of the sheet guide cylinder. This is done by means of an adjusting rod which can be moved by a screw against this.

A disadvantage of these known adjusting devices is that expensive adjustments are required in the case of an adjusting mechanism for centrally controlling the gripper pawl in accordance with the respective thickness of the material to be printed. In the case of a guide drum with a plurality of gripper bridges, basic adjustment and fine adjustment of the gripper claw abutments are required to accurately adjust all the gripper claw abutments together. It is in. Furthermore, during stepless adjustment, hysteresis often occurs due to friction and play in the pivot.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to cope with the dispersion adjustment (height adjustment or height adjustment) of all gripper bridges of a drum for guiding sheets in a printing press. This is to be done according to the thickness of the printing material.

[0008]

According to the present invention, there is provided a drum for guiding a sheet for a rotary printing press, comprising: a gripper shaft; At least one gripper bridge, which is provided around the drum and is provided with an associated position adjusting device and which is substantially radially adjustable to different printing material thicknesses. In the type of sheet guide used, a rotatable position adjusting device acts via a plurality of pressure pieces to adjust a spring-loaded gripper claw strip, At one of its free ends, a roller lever is provided for pivoting with the position adjusting device, the roller lever having a plurality of locking points corresponding to the number of pressure pieces. And these In place, and pivotally mounted one locking member coupled to the compression springs is engaged with the drum, and,
A control cam with upper and lower cam tracks is provided on the side frame so as to be pivotable by an operating device in at least one swivel joint. The problem is solved by cooperating periodically with the control cam. Advantageous embodiments of the invention are described in the dependent claims.

[0009]

The solution according to the invention is particularly suitable for sheet-guiding drums (turning drums) and is also applicable to sheet-guiding cylinders.
It is also suitable for adjusting the gripper claw strips on the feed cylinder or the pre-gripper cylinder. The invention is particularly suitable for drums having a suitable number of gripper bridges arranged symmetrically around the circumference and having a size of one to four times the printing cylinder diameter as one. This drum serves for guiding printing materials having different thicknesses, such as paper or cartons. This remotely controlled individual adjustment of the gripper pawls of all the drums guiding the sheets in one printing press reduces the switching time and minimizes the influence of operator intervention. Furthermore, the invention provides an economically automatable solution. The operating device at the side frame is adapted to the virtual rotational trajectory of the position adjusting device that occurs during the printing operation. Starting from this operating device fixed to the side frame, the transmission of the adjusting movement of the position adjusting device on the drum body takes place on the control cam and on the drum, which is arranged on the drum which rotates and guides the sheet, and is transmitted to the position adjusting device. This takes place by periodic cooperation with the correspondingly positioned roller lever. By means of the operating device and the control cam, the gripper nail strip of the drum for guiding the sheet can be adjusted stepwise by means of a position adjusting device to the corresponding material thickness. This stepwise adjustment of each gripper claw strip significantly reduces the hysteresis phenomenon. In real-world printing, the actual continuous stepless switching of the gripper pawl to the thickness of the material to be printed is not always necessary. Rather, multiple stages, preferably two or three stages, are sufficient. For guiding paper (relatively thin material to be printed), the gripper pawl is high, and for guiding cartons (relatively thick material), the gripper pawl is positioned low. The drum for guiding the sheets of the printing press need not be rotated to the specified angular position for the switching process, and all gripper pawls are controlled at a low speed, for example, at the creep speed of the printing press. It moves so as to pass the cam along its location circle, so that the cooperation of the control cam with the roller lever for adjusting the position adjustment device takes place periodically.

In order to further increase the automation, the position adjusting device is acted upon manually by an operator at the control stand of the printing press or by a device for detecting the thickness of the material to be printed which is connected to the control stand by circuit technology. The operation of the operating device is controlled.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to embodiments.

A drum 1 for guiding sheets is arranged behind a printing cylinder of a printing device arranged in the front in a rotary offset printing press, and another printing device is arranged behind the drum 1. ing. Assuming that the size of the printing cylinder is 1, the drum 1 has a drum body twice as large, and thus supports two gripper bridges 13. The two gripper bridges 13 are symmetrically distributed around the drum (180 ° offset). Each gripper bridge 13 has a gripper shaft and a gripper 18.
And a substantially radially adjustable gripper claw abutment 2. The gripper pawl 2 has, for each gripper 18, a corresponding receiving block for the individual gripper pawl.

The drum 1 is rotatably supported by bearings provided on a side frame 11 via both drum journals. A position adjusting device 3 is arranged corresponding to each gripper claw abutment 2, and the position adjusting device is configured to gradually increase or decrease the height position of the gripper claw abutment 2 depending on the thickness of the printing material. Adjust the position. The position adjusting device 3 is rotatably received as a position adjusting shaft in a bearing 5 provided on the drum body. Therefore, when the drum 1 is twice as large as the printing cylinder, two position adjusting devices 3 are arranged. The gripper pawl 2 is spring-loaded and is supported by a position adjusting device 3. A number of pressure pieces 4 corresponding to the number of desired adjustment stages are arranged on the gripper pawl strip 2 in an adjustable manner. In the embodiment shown, the gripper pawl 2 is adjusted in three stages, so that three pressure pieces 4 are provided. The pressure piece 4 is supported by a position adjusting device 3, in which case the position adjusting device 3 is provided around its periphery with a plurality of notches 14 cooperating with the corresponding pressure piece 4,
As a result, one pressure piece 4 always supports the gripper claw abutment strip 2 on the position adjusting device 3. Pressure piece 4
Is always supported on the outer periphery of the position adjusting device 3,
Therefore, the position adjustment error has no effect on the position of the gripper claw abutment strip 2. A roller lever 6 is arranged at a free end of the position adjusting device 3. The roller lever 6 is provided with rollers 7 and has three locking points 9 depending on the number of desired switching stages, in the case of the exemplary embodiment shown, three switching stages. One of the locking points 9 includes a compression spring 10
Is engaged with the locking member 8. This compression spring 1
0, preferably a gas spring, is pivotally mounted on the end face of the drum 1. When the drum 1 rotates, the position adjusting device 3 or the roller lever 6 moves along an imaginary circle. One side frame 11 adjacent to these has a control cam 1
2 is arranged on a virtual circle that matches this virtual circle.
The control cam 12 has upper and lower cam tracks extending from the outside to the inside in a substantially hopper-like manner. The control cam 12 is pivotally supported by at least one swivel joint 16 provided on the side frame 11 and is connected to an operating device 15, in the embodiment shown, a servomotor and an energy supply 17. Have been. FIG. 5 shows two control cams 12, both of which are shown.
Is tapered inward like a hopper. Each control cam 12
Are each pivotally mounted on one swivel joint 16 and are rotatably connected in common to the operating device 15 and the energy supply behind it.

The operation is as follows.

The drum 1 receives the printed sheets from the printing cylinder of the printing device located at the front and transfers it to the printing cylinder of the printing device at the rear. When guiding printing materials having a changed thickness, it is necessary to adjust the gripper claw strips 2 higher or lower. The energy supply 17 is operated manually or automatically via a control stand. The operating device 15, in this embodiment a servomotor, is controlled by circuit technology. As a result, the operating device 15 causes the control cam 12 to turn, thereby changing the position of the cam track. The printing press is rotated at a low rotational speed (creep speed). At this time, the roller 7 of the roller lever 6 passes through the hopper-shaped control cam 12, the roller 7 comes into contact with the upper or lower cam track (depending on the actual locking position), and the roller lever 6 is moved to the desired new position. It is guided along the cam track so that it can be pivoted to the locking position (locking point 9). Compression spring 1
The roller lever is held at the desired locking point (9) by the lock member 8 and the locking member 8, and as a result, is fixed at the desired position. When the roller 7 and the control cam 12 cooperate with each other in this manner, the position adjusting device 3 also rotates within the support portion 5, and as a result, the pressure piece 4 that has hitherto entered into the notch 14. Then, the pressure piece 4 adjacent to the pressure piece 4 supports the gripper claw contact strip 2. At least one pressure piece 4 is always located on the positioning device 3. At that time, the drum 1 can be operated in the normal rotation direction or the reverse rotation direction. Since the control cam 12 is formed in the shape of a hopper, a desired engagement portion 9 can be set at any time. In order to achieve this adjustment process in all gripper bridges 13, only one revolution of the cylinder is required for each drum 1 of a printing press. This has the advantage that a printing press with a plurality of printing devices arranged one behind the other can also be adjusted centrally by sequence control or simultaneous control.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a drum of one embodiment of the present invention having twice the size of a printing cylinder.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along the line BB in FIGS. 1 and 4;

FIG. 4 is a partial front view of a gripper bridge and a position adjusting device according to the present invention.

FIG. 5 is a diagram showing an arrangement of a control cam and an operation device according to the present invention provided on a side frame.

[Explanation of symbols]

1 drum for guiding a sheet, 2 gripper claw abutment, 3 position adjusting device, 4 pressure piece, 5 support, 6 roller lever, 7 roller, 8 locking member, 9 locking point, 10 compression spring, 11 side frame, 12 control cam, 13 gripper bridge, 14 notch, 15 operating device, 16 swivel joint, 17 energy supply unit, 18 gripper

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-211044 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B41F 21/04-21/10

Claims (4)

(57) [Claims] 1. A drum for guiding a sheet for a rotary printing press, comprising a gripper shaft, a gripper and an associated position adjusting device, which is arranged in a substantially radial direction for different printing material thicknesses. A rotatable position adjusting device (3) formed of at least one adjustable gripper pawl and guiding the sheet using at least one gripper bridge arranged around the drum. ) Acts via a plurality of pressure pieces (4) to adjust the spring-loaded gripper pawl (2), the position adjusting device (3) having one free end. At the end, a roller lever (6) is arranged to pivot with the position adjusting device (3), and the roller lever (6) has a plurality of locking points (9) corresponding to the number of pressure pieces (4). ). One locking member (8) connected to a compression spring (10) pivotally attached to the ram (1) is engaged, and the upper and lower cam tracks are attached to the side frame (11). A control cam (12) provided is pivotally mounted by means of an operating device (15) in at least one swivel joint (16) so that during one rotation movement of the drum (1) the roller lever (6) is rotated. A sheet guiding drum for a rotary printing press, characterized in that the rollers (7) cooperate periodically with the control cam (12). 2. A position adjusting device (3) comprising a position adjusting shaft arranged axially parallel to a gripper pawl (2), said position adjusting shaft being provided on a support provided on a drum (1). 2. The sheet guiding drum according to claim 1, wherein the drum is rotatable in the section. 3. The pressure piece (4) is a gripper nail contact strip (2).
2. The sheet-guiding drum according to claim 1, wherein the drum is arranged to be adjustable. 4. The sheet guiding drum according to claim 1, wherein the cam track of the control cam extends in a hopper-like manner from outside to inside.