CZ297962B6 - Device for semiautomatic clamping of formes - Google Patents

Abstract

In the present invention, there is disclosed a device for semiautomatic clamping of formes to a printing machine form cylinder, said device comprising a first clamping strip controlled by a first control shaft, and a rear clamping strip controlled by a second control shaft. The control shaft (4, 7) and a tension bar (9) extend on one side outward over the form cylinder (1) face (1) and are provided with toothed wheels (5, 8 and 10) cooperating with a control pinion (11) coupled with a control pin (12). Shifting of the control pin (11) into engagement with a corresponding toothed wheel is carried out by a side motor (17) and radial angular displacement is carried out by a bottom motor (16) through the mediation of a control lever (15) via a pair of freewheels (13 and 14). In order to make the shifting into engagement easy, front faces of both the control pinion (11) teeth and the toothed wheel (5, 8 and 10) teeth are provided with skew slopes.

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a device for semi-automatic clamping of printing forms on a mold cylinder of a printing machine, in which the rotation of the clamping bars by the control pinion over the gears on the control shafts is solved.

BACKGROUND OF THE INVENTION

In the known solution according to CZ utility model 9531, the printing mold is clamped by means of clamping shafts provided with control forks. The control fork is driven by a hydraulic cylinder with a gear 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 position and relatively high space demands.

Another known solution according to CZ utility model 8101 is to control the clamping strips by means of a camshaft extending over both sides, which by means of guide pins placed on a fixed bar actuates the pivotally mounted upper bar. The disadvantage of this solution is the necessity to precisely drive the mold cylinder into the control position and position the camshaft in the handling chamber of the mold cylinder.

Another solution uses air-filled bags to control the opening of the clamping strips. The disadvantage is the need to introduce compressed air to the control bars located in the mold cylinder.

Another known solution is the solutions described in DE41 34 310, DE 36 04 209 and DE 39 36 458. In the solution according to DE 41 34 310, it is obvious that the printing shafts are led out to the outside of the mold cylinder and are fitted with gears. The central tension rod is housed inside the printing cylinder and is therefore not operable from the outside of the mold cylinder. DE 36 04 209 also relates to the tensioning of the printing die apparatus in cylindrical printing machines. The tension rod extends outside the printing cylinder and is coupled to the cam mechanism to provide drive. A disadvantage is the need to locate the cam mechanism in the mold cylinder space. DE 39 36 458 discloses a device for quick clamping and tensioning of printing forms in which the actuating shafts are provided at their ends with coupling sleeves in which the corresponding coupling parts engage. The sleeves are formed at both ends of the printing forms. The disadvantage is the necessity of very precise approach of the mold cylinder to the control position.

SUMMARY OF THE INVENTION

The above-mentioned disadvantages are eliminated by a device for semi-automatic clamping of printing forms, consisting of a front clamping bar controlled by a first control shaft and rear clamping blades controlled by a second control shaft and a tensioning rod, which consists in that on one side a side of the mold cylinder face and equipped with gear wheels, with which a control pinion formed on the inner end of the control pin cooperates, which is rotatably and slidably mounted in the sidewall. The control pin is connected via the first and second freewheels and the control lever with which the freewheels are rigidly connected by the outer rings to the lower motor, while the outer end of the control pin is connected to the side motor. The faces of the teeth of the control pinion and the gears are provided with angled slopes. The freewheels have the opposite sense of freewheel rotation.

- 1 GB 297962 B6

The functionality of the device does not depend on the precise setting of the mold roller to the control positions. A further advantage is that the required clamping, opening and tensioning forces are easily achieved due to suitable gear ratios between the control pinion and the respective gear. In addition to the low space requirements, the possibility of using manual clamping or removing the printing form in specific cases of printing machine operation can be considered as an advantage.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be further elucidated by means of the drawings, in which FIG. FIG. 2 shows the bearing of the control pinion and its connection with the control motors. Giant. Fig. 3a shows the relative position of the tapered teeth at the beginning of the engagement of the control pinion in the gear; and Fig. 3b shows the teeth in the engagement position.

DETAILED DESCRIPTION OF THE INVENTION

A first control shaft 4 terminated by a first gear 5 extends through a front clamping bar 3, which is located in the mold cylinder 1. A rear control bar 6 extends through a second control shaft 7 terminated by a second gear 8 and a tension rod 9 provided at the end with a third gear 10. On the external faces of the teeth of all the gears 5, 8 and 10, one-sided angled slots are formed. A control pin 12 is mounted in the flange 2 of the printing machine and terminated on the inside by a control pinion 11. On the face of the individual teeth of the control pinion 11, one-sided inclined recesses are formed. The rotation pin was opposite to the inclined surface angle of the gears 5, 8 and 10. The control pin 12 is connected via the first and second freewheels 13 and 14 to the control lever 15 which is connected to the lower motor 16. The outer end of the control pin 12 is connected to side engine 17.

The mold roller 1 is rotated to a position for inserting the front edge of the printing mold. The outer motor 17 pushes the control pin 12 with the control pinion 11 into the co-engaging first gear 5 of the first control shaft 4. The first freewheel 13 after rotation of the pinion 11 engages the inclined start of the first gear 5 to rotate the control pinion 11 so that engagement between the teeth of the first gear 5. As soon as the control pinion 11 exits the inclined lead of the first gear 5, the control pin 12 is inserted into the second freewheel 14, which has the opposite free rotation direction than the first freewheel 13. The lower motor 16, via the control lever 15, rotates the front clamping bar 3 via the first control shaft 4, thereby clamping the front edge of the printing mold, by means of the side motor 17 the control pinion 11 is extended from the rear. The rotation of the mold roller 1, onto which the printing mold is wound simultaneously, follows. In the same way as for clamping the front edge of the printing die, the rear edge of the printing die is clamped by means of the control pinion 11 and the second gear 8. The tensioning of the printing die is performed by a tensioning rod 9 provided with a third gear 10. forms. The lower motor 16 does not return to the starting position after each operation, but operates in both directions. For example, the motors 16 and 17 may be hydraulic cylinders, pneumatic cylinders, electromagnets, electric linear motors, or any combination of these drives. Removal of the printing form is performed in reverse order.

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

Claims (3)

PATENT CLAIMS A device for semi-automatic clamping of printing forms comprising a front clamping bar controlled by a first control shaft and a rear clamping bar controlled by a second control shaft and a tension rod, characterized in that on one side there are control shafts (4 and 7) and a tension rod (9) ) are led to the outside of the face of the mold cylinder (1) and fitted with gears (5, 8 and 10), with which the control pinion (11) cooperates with the inner end of the control pin (12) which is rotatably and slidably mounted in the side ( 2), wherein the control pin (12) is connected via the first and second freewheels (13 and 14) and the control lever (15) to which the freewheels (13 and 14) are rigidly connected by the outer rings to the lower engine (16), the outer end of the control pin (12) is connected to the side motor (17). Device according to claim 1, characterized in that the faces of the teeth of the control pinion (11) and of the gears (5, 8 and 10) are provided with inclined slots. Device according to claim 1, characterized in that the freewheels (13 and 14) have the opposite sense of free rotation.