JPH0623954A - Plate clamping device of plate cylinder of printing press - Google Patents

Abstract

PURPOSE: To carry out simply the tilting movement of a plate clamping rail by an inexpensive means. CONSTITUTION: A plate clamping rail 3 disposed in a notch of a plate cylinder 1 of a printing machine is supported on a wall of the notch through plate clamping screws 4 distributed in the lateral direction to the printing direction, and the plate clamping screws are provided with different pitches in compliance with respective relative intervals, and the plate clamping screws can be rotated by the same angle simultaneously through an operation device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a plate clamping rail which is arranged in a cutout portion of a plate cylinder and which fixes one end of the plate, and the plate clamping rail is distributed in a lateral direction with respect to a printing direction. To a plate cylinder of a printing press, for example a sheet-fed offset printing press, of the type supported on the wall of the cutout via a plate clamping screw.

[0002]

2. Description of the Related Art A plate cylinder of a sheet-fed offset printing machine has a notch portion parallel to an axis line, and a front or rear plate clamping rail belonging to a leading end or a trailing end of the plate is provided in the notch portion. It is arranged. The plate to be clamped around the outer circumference of the plate cylinder is fixed (clamped) at its edges in the front and rear plate clamping rails, and then is normally clamped via the plate clamping rails belonging to the end of the plate. To be done. In the multiple plate cylinders of sheet-fed offset printing presses, the individual plates must be aligned with each other so that the individual sub-images are accurately registered and overprinted. For this purpose, the front and / or rear plate clamping rails have adjusting means which are designed as adjusting screws, by means of which the left-right register, the top-and-bottom register and in particular the diagonal register can be adjusted. Such a plate clamping device is described in German Patent DE 3936459.

A print image which is oblique to the axis of the plate cylinder is produced by tilting the plate cylinder with respect to the blanket cylinder or, preferably, by fixing the plate with corresponding tilt to the plate cylinder. be able to. In a plate cylinder in which the plate can be tilted, the front and rear plate clamping rails are mechanically connected to each other through a transmission device, and perform parallelogram-shaped movement during tilt adjustment. Such plate clamping devices are described in EP 0 308 797 A / German Patent Application DE 37 31 642 A1 and EP 0401500 A2. However, all these known plate clamping devices have a very expensive construction.

European Patent Application Publication No. 0418088
In the specification, one plate clamping rail, for example, a front plate clamping rail is rotatably supported in a notch portion of the plate cylinder about a pivot point, and is pivoted through an adjusting mechanism to adjust an oblique register. Is described. In this case, the pivot point is at one end of the plate clamping rail and the adjusting mechanism is at the other end of the plate clamping rail. The disadvantage of this device is that it is not possible to provide the plate cylinder with a support mechanism for preventing the deflection of the plate clamping rail in the case of a large plate.

German Patent Application Publication No. 2606
The '773 specification describes a plate clamping rail consisting of upper and lower plate clamping strips. The plate clamping rail can be divided into a number of sections and is fixedly supported by the plate cylinder via a number of adjusting means, which are also designed as plate clamping screws. The plate clamping at the end (for example, the starting end) of the plate at an angle is performed by rotating the individual plate clamping screws by a predetermined degree individually determined in advance. In this case, the end of the plate is loosened, the plate clamping screw is adjusted, and then the plate is clamped again. Since this work is done manually, it takes time. Adjusting with a motor is also expensive because of the large number of plate clamping screws.

[0006]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to have a plate clamping rail which is arranged in the notch of the plate cylinder and which fixes one end of the plate.
By improving the plate clamping device of the plate cylinder of the printing machine, which is supported by the wall of the notch through the plate clamping screws distributed in the direction transverse to the printing direction, by an inexpensive means This means that the tilting movement of the plate clamping rail can be easily performed regardless of whether the adjustment is performed by the motor or the motor.

[0007]

Means for solving this problem can be as described in claim 1. Further, claims 2 to 8 describe advantageous embodiments.

That is, according to the present invention, in particular, the front plate clamping rail is fixedly supported on the plate cylinder by a large number of plate clamping screws having different pitches. These plate clamping screws have their threads in the plate clamping rail and can be pivoted through the plate clamping rail or cooperate with a threaded bush that is fixedly arranged on the plate cylinder. . In the present specification, the term "plate clamping screw" includes all types of screws that support the plate clamping rail on the wall of the cutout portion.

The pitch of the plate clamping screws is individually determined according to the mutual spacing in the lateral direction with respect to the printing direction, and when all the plate clamping screws are simultaneously rotated by the same angle, a tilting motion is performed. It is like this. In order to rotate all the plate clamping screws by the same angle at the same time, the plate clamping screws are pivotally attached, for example via a lever arm, to an adjusting rod of the actuating device which is axially movably supported on the plate cylinder. There is.
In this case, the adjusting rod is moved axially via the screw spindle in response to the desired tilting movement. This screw spindle can be, for example, a screw spindle that is manually operated by a tool and is fixedly supported on the plate cylinder, which screw spindle is screwed into the thread of the adjusting rod.

The operating device with the screw spindle and the adjusting rod can also be driven by a motor arranged in the plate cylinder. An electric motor, for example, can be used to drive the screw spindle via a transmission, but in a preferred embodiment of the invention a pneumatic device with two single-acting working cylinders is used.

Instead of the adjusting rod pivotally attached to each plate clamping screw via a lever arm, rack teeth are provided on the adjusting rod at predetermined intervals so as to engage with external teeth provided on the plate clamping screw. You can also do it. In addition, screw teeth are provided at a predetermined interval on the rotatable adjustment rod, and engage with the teeth of the plate tightening screw.
It can also be a worm transmission mechanism.

If the plate clamping rail according to the invention is used at the beginning of the plate for tilt adjustment of the plate, it is advantageous to loosen the clamping of the plate clamping rail at the end of the plate, ie at the rear. This causes the plate to be repositioned during tilt adjustment in the area of the plate clamping rails at the end of the plate. After the tilt adjustment is performed, for example, the plate cylinder is rotated with respect to the blanket cylinder, and the plate is clamped via the plate clamping rail at the rear.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be specifically described below with reference to the embodiments shown in FIGS.

FIG. 1 shows a portion of a plate cylinder 1 having a notch portion 2 and a plate clamping rail 3 arranged therein, in the range of the leading end of the plate. In the illustrated embodiment, the plate clamping rail 3 is supported by the wall 5 of the cutout 2 via a total of four plate clamping screws 4.

As shown in FIGS. 1 and 3, the plate clamping screw 4 is arranged between the plate clamping rail 3 on the front side and the wall 5 of the notch 2 which belongs to the starting end of the plate. Plate tightening screw 4
One of the ends is screwed into a threaded bush 4.1, which is fixedly supported on the plate cylinder 1, respectively. On the other end of the plate clamping screw 4, a divided plate clamping rail 3 is supported via an adjusting screw 4.2. The adjusting screw 4.2 has, for example, a spherical end portion, and is useful for basic adjustment (top-to-bottom registration and diagonal registration) of the plate clamping rail 3.

FIG. 3 shows a cross section of the plate clamping rail 3. The plate clamping rail has an upper plate clamping strip 6 and a lower plate clamping strip 7.
And consists of. The lower plate tightening strip 7 is movable relative to the upper plate tightening strip 6, and the plate has a clearance 8
It can be moved, for example by a pneumatic or mechanical drive, not shown, for insertion and tightening. The adjusting screw 4.2, in this embodiment, has its thread screwed into the correspondingly formed thread of the upper plate clamping strip 6. The adjusting screw 4.2 projects into, for example, a long hole of the lower plate fastening strip 7. The elongated holes allow the lower plate fastening strip 7 to move relative to the upper plate fastening strip 6. The plate clamping rail 3 is supported by a guide (not shown) so as to be tiltable on the bottom of the notch 2 via an upper plate clamping strip 6, for example.

The individual plate clamping screws 4 and the individual threaded bushes 4.1 have respectively different pitches, in which case the pitches are different depending on the mutual spacing of the plate clamping screws 4. When the fastening screws 4 are simultaneously rotated by the same angle, the plate fastening rail 3 can be inclined with respect to the wall 5 of the cutout portion 2. In FIG. 1, the rightmost plate clamping screw 4 and the threaded bush 4.1 have the smallest pitch, and the leftmost plate clamping screw 4 and the threaded bush 4.1 have the largest pitch. Have The pitches of the second and third plate clamping screw 4 and the threaded bush 4.1 from the left are correspondingly decreasing in sequence. In FIG. 1, the plate clamping rail 3 is in a starting position parallel to the wall 5. When all the plate clamping screws 4 are rotated by the same angle, the left end of the plate clamping rail 3 is separated from the wall 5 more than the right end.

By appropriately selecting the pitch of the plate clamping screw 4, the rotation point of the plate clamping rail 3 can be generated at a desired position. The point of rotation may be significantly spaced outward from the plate cylinder 1. Also, the two left plate clamping screws 4 have right threads having different pitches, and the two right plate clamping screws 4 have mirror images symmetrically with each other and have left threads having different pitches. It is also possible to do so. In this case, the plate clamping rail 3 is swung around a rotation point at the center of the plate.

As shown in FIGS. 1 to 3, the plate cylinder 1 is arranged in the cutout 2 below the threaded bush 4.1 and between the plate clamping rail 3 and the wall of the cutout 2. There is an adjusting rod 9 which is slidably supported in the axial direction. This adjusting rod 9
Can be mounted on the bottom of the cutout 2 by means of a sliding or rolling bearing, not shown.
In this case, the adjusting rod 9 is part of the operating device 12 (FIG. 3).

In particular, as shown in FIG. 2, a lever arm 10 is attached to the end of the plate tightening screw 4, and the free end of the lever arm 10 is formed in a fork shape. The lever arm 10 is led out from the notch of the threaded bush 4.1 formed according to the maximum rotation angle (for example, 60 °) of the plate tightening screw 4.
In this case, the fork-shaped end portions of the lever arms 10 of the respective plate tightening screws 4 are respectively attached to the adjusting rods 9 by the driving pins 1.
It is pivotally attached to 1. The mutual distance between the entraining pins 11 of the adjusting rod 9 is equal to the mutual distance between the plate clamping screws 4. Lever arm 1
When 0 is swung to the position shown in Fig. 2,
The plate clamping rail 3 can be in the starting position in FIG.

As shown in FIG. 4, the plate tightening screw 4 can be simultaneously rotated by the same angle by the operating device 12. The operating device 12 has a screw spindle 13 which is fixedly supported by the plate cylinder 1 and is rotatably supported. This screw spindle 13 is screwed into an internal thread which is formed corresponding to the adjusting rod 9. The operating device 12 can be provided, for example, in the left side portion of the cutout portion 2 in FIG. The screw spindle 13 can be driven by a motor 15 via a transmission 14 consisting of gears. Motor 15
Can be provided at the bottom of the cutout 2 or in a special cutout. The motor 15 can be configured, for example, as an electric motor that slides the adjusting rod 9 by a predetermined distance via the screw spindle 13 and the transmission mechanism 14. As a result, the plate clamp rail 3 is tilted through the plate clamp screw 4. The supply of energy to the motor 15 and the control of the motor 15 are performed via a rotation transformer attached to a pin of the plate cylinder 1.

In the embodiment described above, the plate clamping screws 4 having different pitches and having the threaded bush 4.1.
In addition to the above, an adjusting screw 4.2 is also provided. However, in a simple embodiment, the plate clamping screws 4 having different pitches are not provided with the adjusting screws 4.2, but the plate clamping rails 3 are provided.
It is also possible to screw it into. In this case, the plate clamping rail 3 is supported directly on the wall 5 of the cutout 2 via the end of the plate clamping screw 4 (without other adjusting means).

FIG. 5 shows an advantageous embodiment of the motor 15 shown in FIG. 4, in which two single-acting working cylinders 16 and 17 acting against the force of a spring (not shown) are used. There is. On the shaft 22 of the transmission mechanism 14, two gears 20 and 21 of the ratchet mechanism having ratchet tooth profiles are arranged side by side in a mirror image symmetry. Each work cylinder 16
・ 17 piston rods 18 ・ 19 are associated gears 20 ・ 21
The piston rods 18 and 19 act substantially tangentially on the outer circumference of the associated gears 20 and 21. The end portions of the piston rods 18 and 19 are configured as the feed of the ratchet mechanism, and engage with the teeth of the gears 20 and 21 at each stroke of the piston rods 18 and 19 to move the gears 20 and 21. Take it intermittently.

Therefore, in FIG. 5, the working cylinder 1
6, the piston rod 18, and the gear 20 constitute a ratchet mechanism that converts linear motion into rotary motion.
Is taken only clockwise. The work cylinder 17, the piston rod 19, and the gear 21 also constitute a ratchet mechanism, and the gear 21 is entrained only in the counterclockwise direction. The entrainment of the gears 20 or 21 takes place with the other ratchet mechanism in the starting position, so that it is not blocked by the other ratchet mechanism.

By using two aerodynamic working cylinders 16 and 17, it is possible to obtain a drive which is compact in construction and has a large drive moment and which is controllable in both rotational directions.

[0026]

As described above, according to the present invention, there is provided the plate clamping rail 3 which is arranged in the cutout portion 2 of the plate cylinder 1 and which fixes one end of the plate. In a plate clamping device for a plate cylinder 1 of a printing press, the plate clamping screw 4 is printed by a type in which it is supported by the wall 5 of the cutout 2 via plate clamping screws 4 distributed transversely to the direction. Since the plates have different pitches depending on the mutual distance in the lateral direction, and the plate clamping screws 4 can be simultaneously rotated by the same angle via the operating device 12, they are inexpensive. By the means, it is possible to easily perform the tilting movement of the plate clamping rail regardless of the manual adjustment and the motor adjustment.

[Brief description of drawings]

FIG. 1 is a plan view of a plate cylinder cutout portion having a plate clamping rail according to the present invention.

FIG. 2 is a view showing an adjusting rod connected to a plate tightening screw.

FIG. 3 is a cross-sectional view of a plate clamping rail according to the present invention.

FIG. 4 is a view showing an operating device and a driving device for the adjusting rod.

FIG. 5 is a diagram showing an aerodynamic drive device.

[Explanation of symbols] 1 plate cylinder, 2 notches, 3 plate fastening rails,
4 plate tightening screw, 4.1 threaded bush,
4.2 Adjusting screws, 5 walls, 6 and 7 plate tightening strips, 8 clearances, 9 adjusting rods, 10 lever arms, 11 driving pins, 12 operating devices, 13 screw spindles, 14 transmission mechanisms, 15 motors, 1
6 and 17 working cylinders, 18 and 19 piston rods, 20 and 21 gears, 22 shafts

Front page continuation (72) Inventor Herbert Schopper Germany Westheim Pfürk Strasse 6 (72) Inventor Helmut Schilt Germany Federal Republic Steinbach Taunus im Wingelzgrund 148 (72) Inventor Guido Leschke Federal Republic of Germany Hün Felden-Ohren Drosselweg 11

Claims (8)

[Claims] 1. A plate clamping rail for fixing one end of the plate, the plate clamping rail being arranged in a cutout portion of the plate cylinder, the plate clamping rail having a plate clamping screw distributed transversely to a printing direction. In a plate clamping device for a plate cylinder of a printing machine, which is supported by the wall of the cutout, the plate clamping screws (4) have different pitches depending on the mutual distance in the lateral direction with respect to the printing direction. And the plate tightening screw (4) is
2) A device for clamping a plate on a plate cylinder of a printing machine, which is capable of being rotated by the same angle at the same time through the above. 2. The plate clamping screw (4) is a plate clamping rail (3).
And a wall of the cutout (2), which is fixedly supported by the plate cylinder (4.1).
The plate clamping device according to claim 1, wherein one end is screwed into the inside. 3. An adjusting screw (4.2) is provided in the plate clamping rail (3) belonging to each plate clamping screw (4), and the plate clamping rail (3) is provided through these adjusting screws. 3. The plate clamping device according to claim 2, wherein the plate clamping device is supported by a plate clamping screw (4). 4. The plate clamping screw (4) is attached to the lever arm (1).
0), and these lever arms have an operating device (1) movably supported in the axial direction of the plate cylinder (1).
The plate clamping device according to any one of claims 1 to 3, which is pivotally attached to the adjusting rod (9) of 2). 5. The adjusting rod (9) of the operating device (12) has entraining pins (11), these entraining pins being the forks of a lever arm (10) with which the plate clamping screw (4) can be swiveled. The plate clamping device according to claim 4, wherein the plate clamping device is engaged with the end portion. 6. The operating device (12) is a screw spindle (1).
3), the screw spindle has an adjusting rod (9)
6. The plate clamping device according to claim 4 or 5, which is rotatably and rotatably supported in the axial direction and is screwed into the inner thread of the adjusting rod (9). 7. The operating device (12) is drivable via a transmission mechanism (14) arranged in the plate cylinder (1) and a motor (15). The plate clamping device according to any one of 1. 8. A pneumatically operable single-acting cylinder (16,17) with two motors (15), the piston rods (18,19) of which are the shafts of the transmission mechanism (14). (22) The plate clamping device according to claim 7, which acts in the form of a ratchet mechanism via two gears (20, 21) having a ratchet tooth profile provided.