CZ303469B6 - Device for semiautomatic clamping of forme - Google Patents

Abstract

In the present invention, there is disclosed a device for semiautomatic clamping of a printing form, particularly a device for semiautomatic clamping of a printing form disposed on a printing machine plate cylinder (1), wherein the device comprises a front clamping system (2) for clamping a front edge of the printing form and a rear clamping system (7) for clamping a rear edge of the printing form, whereby both the front clamping system (2) and the rear clamping system (7) comprise an upper stationary clamping bar (20) and a lower movable clamping bar (23). Said movable clamping bar (23) consists of segments (19), which are provided with cavities (24) for contact with clamping springs (17) anchored by their other end in a base bar (21), and a shaped groove (25), wherein one end of a double-arm lever (18) being pivoted about a supporting shaft (15) fits into said groove (25), while the other end of said double-arm lever (18) is in contact with a profiled groove (26) of a control shaft (3, 8).

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a device for semi-automatic clamping of printing forms on a mold roll of a printing machine.

BACKGROUND OF THE INVENTION

In the known solution according to DE 101 60559, the printing mold is clamped by means of pneumatic cylinders located at the control bars in the mold cylinder. The disadvantage is the necessity of using special pistons for smaller installation dimensions and the introduction of compressed air to the control rails located in the mold cylinder. Also, the front clamping bar does not allow further deflection of the printing form in the diagonal direction.

Another known solution according to the utility model CZ 9531 is to control the clamping bars by means of shafts provided at the end with control forks. The control fork is driven by a hydraulic cylinder with a toothed ring with a control pin. The gear ring is controlled by an electric motor. The disadvantage of this solution is the necessity of precise approach of the mold cylinder to the control positions and a relatively large space requirement.

According to EP 458 323, the printing mold is held by an upper pendulum clamping bar firmly connected by an anchor screw to a lower clamping bar. The upper clamping bar is opened by means of a control shaft. The disadvantage of this solution is the high demands on adjusting the clamping bars for different thicknesses of printing forms.

Another solution according to CZ 9532 is the insertion of disc springs under the anchor bolts connecting the upper swivel clamping bar and the lower clamping bar, so as to reduce the demands on adjusting the clamping bars in relation to the thickness of the printing form. The disadvantage of the solution is the high cost.

Another known solution according to DE 42 15 206 is the introduction of compressed air under the anchor bolts so that the upper bar closes without resistance when it is in contact with the printing form. A disadvantage besides increased costs is the need to introduce compressed air into the mold cylinder.

SUMMARY OF THE INVENTION

To a large extent, the apparatus for semi-automatic printing mold clamping, in particular a semi-automatic printing mold clamping device mounted on the printing cylinder of the printing machine, comprising a front clamping system for the front edges of the printing mold and a rear clamping system for clamping the rear edge of the printing mold. Both the clamping system and the rear clamping system comprise an upper fixed clamping bar and a lower movable clamping bar according to the invention, characterized in that the movable clamping bar is formed by segments which are provided with cavities for contacting the clamping springs anchored at their other end in the base bar. and a shaped groove into which one end of the two-arm lever extends which is rotatable about a support shaft, the other end of the two-arm lever being in contact with the profile groove of the control shaft.

Preferably, both actuating shafts are led to the outside of the face of the mold cylinder, the front actuating shaft being geared, which is driven by the gear ring of the first actuating lever provided with the rotary ring, and the rear actuating shaft being equipped with the second actuating lever provided with the rotating ring. The rotating rings serve as opaque points for the left engine linkage.

The left engine link acts on the control lever pivot ring via the gear lever.

The functionality of the device does not depend on the precise setting of the mold cylinder in two control positions. Another advantage is that the required clamping force is easy to achieve due to suitable lever ratios. The device enables clamping of printing forms of different thicknesses without the need for assembly adjusting intervention. The operating mechanism is simple in design and is characterized by low space demands. Another advantage is the possibility of using manual clamping or removal of the printing form in specific cases of printing machine operation.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be elucidated by means of the drawings, in which FIG. Fig. 2 shows the front clamping system in a closed state with a cut in the plane of the clamping spring. Giant. 3 shows the front clamping system in a closed state with a cut in the plane of the two-arm lever. FIG. 4 shows the front clamping system in an open state with a section in the plane of the two-arm lever. Giant. 5 shows the rear clamping system in an open state with a cut in the plane of the two-arm lever and the tension spring. Fig. 6 shows the location of the control levers and motors. Possibilities of actuating the control levers of the engine rods are shown in Figures 7 and 8, Figures 9 and 10 illustrate the transmission of the movement of the engine rods to the control levers by means of a gear lever.

DETAILED DESCRIPTION OF THE INVENTION

The printing cylinder 1 (FIG. 1, FIG. 6) of the printing machine is fitted with a front clamping system 2 for clamping the front edge of the printing die and a rear clamping system 7 for clamping the rear edge of the printing die.

Both the front clamping system 2 and the rear clamping system 7 (FIG. 2) comprise an upper fixed clamping bar 20 and a lower movable clamping bar 23. The movable clamping bar 23 is formed by segments 19 which are provided with cavities 24 for engaging clamping springs 17 anchored by their second end in the base bar 21. The segments 9 (FIG. 3, FIG. 4) are further provided with a shaped groove 25 into which one end of the two-arm lever 18 extends and rotates around the support shaft 15, the other end of the two-arm lever 18 contacting the profile groove 26 of both control shafts 3. , 8.

The control shafts 3, 8 (Fig. 1, Fig. 7, Fig. 8) are led to the left outer side of the face of the mold cylinder 1, the front control shaft 3 being fitted with a gear 4 which is controlled by the gear ring of the first control lever 5 ring 6, and the rear actuating shaft 8 is fitted with a second actuating lever 10 provided with a rotating ring 6, the rotating rings 6 serving as opaque points for the rod 27 of the left engine 16.

In a preferred variant (Fig. 9, Fig. 10), the linkage 27 of the left motor 16 acts on the rotary ring 6 of the control levers 5, 10 via the gear lever 9.

The rear clamping system 7 (Fig. 1, Fig. 5, Fig. 6) further comprises a camshaft F2 and tension springs.

11, which are spaced between the mold roll body 1 and the bottom surface of the base 21.

The camshaft 12 extends to the right outer side of the mold cylinder 1 and is fitted with a third control lever 13 provided with a rotating ring 6 on which the right motor shaft 22 acts.

The two-arm levers 18 of the front clamping system 2 and the rear clamping system 7 rotate around the support shafts 15. The motors 16,22 (Fig. 6) are attached to the sidewalls tisk4 of the printing machine. The left motor 16 turns the first actuating lever 5, which actuates, through the front actuating shaft 3, a two-arm lever 18 which acts through the groove 25 on the segment 19 against the force of the clamping spring 17 and subsequently opens the front clamping system 2. to the gap between the segments 19 and the upper clamping strip 20, the left motor 16 returns to the starting position. The clamping springs 17 clamp the front edge of the printing form and return the first control lever 5 to the home position. This is followed by rotation of the mold roller 1, on which the printing die is simultaneously wound, to a position for clamping the trailing edge of the printing die. The left motor 16 turns the second control lever 10 on the rear control shaft 8, and in the same manner as the front clamping system, the rear clamping system 7 is opened.

The right motor 22 turns the third control lever 13 on the camshaft 12 and urges the rear clamping system 7 against the tension spring 11 to the rear edge of the mold cylinder 1. The left motor 16 returns to its starting position and the rear edge of the printing mold is clamped. The right-hand motor 22 returns to its initial position, and the tensioning springs 11 tension the printing form.

When removing the printing form, the right motor 22 no longer functions, but only the rear clamping system 7 and the front clamping system 2 are opened.

The motors 16, 22 may be formed, for example, by hydraulic cylinders, pneumatic cylinders, electromagnets, electric linear motors or any combination of these drives. The rods 27 of the motors 16, 22 or the gear levers 9 turn the control levers 5, 10, 13 over their rotary rings

6.

To increase the clamping force of the front clamping system 2 and the rear clamping system 7, the control levers 5, 10, 13 can be actuated by a gear lever 9 connected to a rod 27 of the motors 16, 22.

Increasing the clamping force of the front clamping system 2 allows the transmission between the gear 4 and the first control lever 5.

The invention is not limited to the described embodiment of the device for semi-automatic clamping of printing forms.

Claims (3)

PATENT CLAIMS Apparatus for semi-automatic clamping of a printing die, in particular a device for semi-automatic clamping of a printing die placed on a mold roller (1) of a printing machine, comprising a front clamping system (2) for clamping the front edge of the printing die and a rear clamping system (7) the front clamping system (2) and the rear clamping system (7) comprise an upper fixed clamping bar (20) and a lower movable clamping bar (23), characterized in that the movable clamping bar (23) is formed by segments ( 19), which are provided with cavities (24) for engaging clamping springs (17) anchored at their other end in the base bar (21), and a shaped groove (25) into which one end of the two-arm lever (18) rotates around the second end of the two-arm lever (18) is in contact with the profile groove (26) of the control shaft (3, 8). - 3 GB 303469 B6 Device according to claim 1, characterized in that the actuating shafts (3, 8) are led to the outside of the face of the mold cylinder (1), the front actuating shaft (3) being fitted with a gear (4) which is driven by a gear the ring of the first control lever (5) provided with the rotary ring (6), and the rear control shaft (8) is fitted with a second control lever (10) provided with 5, the rotary rings (6) serving as support points for the rod (27) of the left engine (16). Device according to claim 2, characterized in that the linkage (27) of the left motor (16) acts on the rotary ring (6) of the control lever (5, 10) by means of a gear lever (9).