KR20000005811A - Positioning device of a flexible printing plate - Google Patents

Abstract

PURPOSE: A location deciding device is provided to bias a flexography plate by establishing an automatic device on the plate-shaped cylinder of a rotary printer. CONSTITUTION: A location deciding device comprises:a bias device is supported on a substrate(4) having an unmovable front claw(5), and the front claw tightly holds the front verge of the printing plate(19) placed centering around a plate-shaped cylinder(3) at a notch(7); the substrate(4) is attached on a roller(11) and the roller is placed between sides(12,13) of a round-shaped cam ring(14) installed on a printer frame; a device(101) made of an electric motor is mechanically connected with the plate-shaped cylinder(3), and the plate-shaped cylinder is movable along the rotating pivot(2) to the side direction.

Description

Positioning device for flexible printing plate on plate-shaped cylinder {POSITIONING DEVICE OF A FLEXIBLE PRINTING PLATE}

The present invention relates to a positioning device of a flexible printing plate on a plate cylinder, in particular an apparatus for biasing such a flexible printing plate on a plate cylinder of a rotary printer.

Frequently used in the packaging industry for printing plate materials such as sheet of paper or cardboard, this type of printing machine is commonly called a flexographic printing press and is used in the direction of travel of a plurality of constituent stations, namely plate materials. An infeed station that continuously grips the sheets one by one from the top of the pile in accordance with logical development from upstream to downstream, one or more print groups, with one or more dryers located between them, if desired. It consists of a transport station that collects printed material. The thin plates are conveyed by roller rows and suction systems from one station or group to another station or group located above them, thereby completely freeing the printing surface of the bottom of the sheet.

The positioning device of the printing plate is used in the printing group. In general, each printing group for printing one color consists of a plate-shaped cylinder, in which a flexible printing plate is wound around and extended. These printing plates, which are covered with ink by the screened cylinders, have one or more plates in the sheet that move between the plate-like cylinders and the pressure rollers, depending on the number of printing forms the printing plates have, as each cylinder rotates. These plate-shaped cylinders and pressure rollers are arranged to print the pattern and to print on the lower surface of the sheet.

A print typesetting made of rubber or plastic material is adhered onto a flexible support base made of polyester, such as mylar, to form an assembly, commonly referred to as a print plate. It is precise to glue the print typesetting onto the polyester base after making the print typesetting. The adhesion of the printing typesetting performed by the manufacturer directly determines the quality of the printing registers between the various colors. Plastic strips are installed at the upstream and downstream ends of this flexible support base, the longitudinal edges of which have a U-shaped area and also allow the plate to be fixed to a claw fastened to the plate cylinder. This claw is arranged in a direction parallel to the axis of rotation of the cylinder. A thin metal plate with an elongated hole with a longitudinal upstream-downstream axis attached to the strip fits on a centering pin fastened to the claw, allowing for fast and precise positioning of the printing plate on the cylinder.

When fixing the printing typesetting on the flexible support polyester base, the lateral and longitudinal positioning errors due to the rotation of the plate cylinders about their respective lateral movements or axes can be easily corrected, but if the printing typesetting If it is an error due to bias, it will not. At this time, the side of the printing typesetting is not oriented in a direction parallel or perpendicular to the upstream and downstream edges of the polyester base, thereby causing uncorrectable bias positioning of the printing typesetting with respect to the direction given by the axis of rotation of the plate-shaped cylinder.

If each print typesetting is bonded to the flexible polyester base with a plurality of print typesettings having the same bias error, it is generally influenced by the positioning error resulting from bias positioning by aligning the upper edge of each print typesetting. Can be assimilated to a single large print typeset received.

To remedy this problem, various known devices can pivot the front and rear claws about the axis of rotation of the plate cylinder to bias the printing plate by the same range as opposed to a recognized error.

Because of this, U.S. Patent 5,448,904 introduces a device consisting of two parallel bars for securing the end of a printing plate. The manual rotational control of the calibrated eccentric gauges allows the lateral movement (parallel to the axis of rotation of the cylinder) to be applied to the rear fixing bar of the printing plate, and the joint of the piece of joint jointed around a plurality of pivots arranged at the ends. Classify the turning of the front bar due to the assembly. Due to the joints actuated by the springs located at one end of the rear bar, when the printing plate is held by the two ends of the device, the rear bar is automatically in position, parallel to the position occupied by the front bar. You will turn to. The entire mechanism is arranged in the plate-shaped cylinder body at the bottom of a wide deep groove machined in a direction parallel to the axis of rotation of the cylinder. The eccentric control mechanism is mounted on one side of the plate cylinder.

EP 232,730 introduces another biasing device of a printing plate which proposes a mechanism based on the rotation of two tension bars with fixed ends of the printing plate. The ends of the tension bar are interconnected by two triangular joint plates and are also mounted on two fixed pivots fastened to the plate cylinders. The pivot of the joint portion is rectangular, and the tension bar of the printing plate pivots about an imaginary point P located on the central axis of the plate cylinder. The control means is arranged on one side of the plate cylinder, and when the plate cylinder stops at any position, the control means consists of a complex mechanism consisting of a jointing lever that can be actuated by a single acting cylinder.

Japanese Patent 62-56146 solves the problem of the bias of a printing plate having a device consisting of two bars each operated by two hydraulic cylinders. If the position of the printing plate is to be corrected diagonally, the hydraulic pressure of these four hydraulic cylinders is reduced, so that the fixing bar of the printing plate can be loosened and retracted so that the four springs compressed by the four hydraulic cylinders open. The correction value is input to the controller, which converts the correction value into the corresponding hydraulic pressure applied to two further hydraulic cylinders arranged on the same side at one end of the fixing bar. Under the action of these two further hydraulic cylinders, the two inclined surfaces can be independently linearly moved so that when closing the fixed bar of the printing plate, one end of each bar moves in the vertical direction due to the triangular shape of the inclined surface. In a preferred embodiment, the inclined surface may also be actuated by a motor drive screw mechanism.

Various drawbacks arise from these devices, namely

There is a so-called closing mechanism, which is bulky and requires the placement of grooves with dimensions critical to the diameter of the cylinder in the plate-shaped cylinder body,

Due to the importance of the arrangement of these mechanisms, there is an undesirable imbalance that creates restraint requirements originating in the cylinder bearing when the cylinder bearing reaches a certain rotational speed,

There is a circumferential working surface around the cylinder which is reduced by the critical width of the grooves required by the biasing device,

In some cases a manual adjustment exists which requires a stop of the press including an extended adjustment time,

When previous work is resumed, it is not possible to rely on full automation of plate adjustments, and for this to be done, the adjustments must be stored numerically and memorized, and

In the case of non-manual adjustment, there is a disadvantage in that it is necessary to control the mechanism causing the bias of the plate by using an additional actuator independent of one actuator that enables lateral or circumferential movement of the plate cylinder.

The biasing device of the printing plate according to the invention compensates for these drawbacks by providing a simple automation means, which means that it occupies only a minimal space in the plate-shaped cylinder body, so that the printer does not need to stop. Effectively, by occupying only the minimum volume occupied, the printer is not dependent on the biasing mechanism of the printing plate operated by the actuator disposed on the plate-shaped cylinder body. Thus, in order to drive the biasing mechanism of the printing plate, the apparatus described in the present invention uses an electric motor fastened to the frame of the printing machine which is made identical to the motor for moving the plate-shaped cylinder for lateral adjustment. This solution, on the one hand, allows for more rational use of the pre-provided actuator for lateral adjustment of the printing plate, and on the other hand, a plate-shaped cylinder without the use of this mechanism, which is cost-effective and small in volume, yet rigid and reliable. It is to obtain a bias mechanism that is easy to apply to. Finally, this mechanism allows the use of an external electronic controller connected to a plurality of position sensors placed outside of the cylinder to measure various adjustment positions suitable for each task which can be easily restarted in the future without having to register the position. I can remember. This latter variant provides additional advantages that are particularly suitable for the mechanism of the present invention.

For this purpose, the present invention is directed to a positioning device of a flexible printing plate as described in claim 1.

In order to define some of the expressions used in the detailed description of the invention to describe the position of some components within the press, such as "operator's side" (CC) and "opposite operator side" (COC) It will be understood that the term refers to the side shown from the longitudinal central axis of the mechanism. This is to avoid confusion of conventional terms such as left and right which depend on the observer's side. Likewise, in order to describe the orientation of several axes or means, the generic terms "longitudinal" and "lateral" will be used referring to the central axis of the printing press, the orientation of which is determined by the direction of motion of the plate-like material. Finally, it can be seen that terms such as "upstream" and "downstream" refer to the direction of motion of the plate material inside the printing press.

1A and 1B are plan views showing third C.O.C and third C.C, respectively, of a bias device mounted on a plate cylinder;

2 is a partial cross-sectional view of an end C.C of the positioning device for a flexible printing plate on a plate-like cylinder.

3 and 4 are cross-sectional views of a biasing device mounted on a plate cylinder in accordance with lines A-A and B-B in FIGS. 1A and 1B, respectively.

5A and 5B are plan views showing 1/2 C.O.C and 1/2 C.C of the base plate and a claw support fitted thereto;

6 is a partial cross-sectional view of this cylinder in the vicinity of cam C.C in a direction parallel to the axis of rotation of the plate-like cylinder;

7 is a plan view of cam C.C and its stirrup.

8A is a schematic plan view of a biasing device of a printing plate, in particular when the mechanism of the invention is in an intermediate position of the unbiased printing plate;

FIG. 8B is different from FIG. 8A in that the biasing mechanism of the printing plate acts at the first end position after clockwise rotation;

FIG. 8C is different from FIG. 8B in that the biasing mechanism of the printing plate acts in the second end position after counterclockwise rotation.

* Description of the components of the main parts of the drawings *

1: groove 2: axis of rotation

3: plate cylinder 4: base plate

5: front claw 6: rear claw

14: Cam ring 15, 16: roller

17, 18: cam 25: claw support

26: hole 27: stud

28: screw 63: opening

64: bushing 65: shell

66: compression spring 67, 68: washer

72, 73, 76: opening 80: foundation

81: pin 62, 82: screw

84: projection 102: support means

103: fastening means

1A and 1B are a positioning device of a printing plate arranged in the groove 1 processed in a direction parallel to the rotation axis 2 of the plate-shaped cylinder 3. As well shown in the corresponding cross-sectional views of FIGS. 3 and 4, the biasing device is supported on a base plate 4 equipped with a non-movable front claw 5, which is mounted on a plate-shaped cylinder ( 3) The front edge of the printing plate 19 arranged around the grip plate is gripped. A block in which the movable rear claw 6, which faces the front claw 5 and grips the rear edge of the printing plate 19 at the notch 8, is fastened to the plate-like cylinder 3 by two fastening screws at the end COC. Meshes with roller 10 screwed onto 100. At the opposite end of the positioning device (FIG. 2), the base plate 4 is attached to the roller 11, which is mounted on the side surface of the circular cam ring 14 mounted on the printing machine frame (not shown). 12, 13). As shown in FIGS. 1A and 1B, two different rollers 15, 16 are fastened to the base plate 4 so that the two are firmly attached to the bottom of the groove 1 of the plate-shaped cylinder 3. They slide on cams 17 and 18, respectively. The means 101 consisting of an electric motor is mechanically coupled with the plate cylinder 3 and can also move the plate cylinder laterally along the rotational axis 2.

As shown in FIGS. 1A, 1B and 3, the base plate 4 is first fixed by screws 23 from above, and a plurality of supports in the form of a rectangular block held at the base by screws 21. And a front claw 5 held by a longitudinally shrouded protective plate 22 and a screw 24 that also secures the protective plate 22. On the opposite side of the front claw 5, the rear claw 6 is attached by a fastening means 103 (FIG. 4) onto a claw support 25 made of a metal plate having a plurality of elongated holes 26. A stud 27 is provided which can hold the rear claw 6 on the claw support 25 by the fastening screw 28 through the hole 26. The orientation of this elongate hole 26 allows the lateral movement of the claw support 25 relative to the rear claw 6 and allows this rearward movement so as to move longitudinally perpendicular to the axis of rotation 1 of the plate-shaped cylinder. The claw is driven. The closing and opening of the rear claw 6 is achieved by this movement which can clamp or release the printing plate of the plate cylinder 3. The claw support 25 can be securely obtained by using the screws 29 of two blocks 30 which are dice-shaped rectangles and slide along two axes 31. This axis is held using a support 32 attached to the base plate 4 by screws 33 at each end. On each support there is a fastening screw 34 on the support 32 to fix the shaft 31. Thus, the claw support 25 can move longitudinally along the axis 31 driving the rear claw 6 due to the longitudinal orientation of the elongated hole 26.

The longitudinal opening movement 6 of the rear claw 6 is controlled by seven simultaneous actuating hydraulic cylinders 40 (FIGS. 5A, 5B), which are provided with a base plate 4 by means of fixed clamps 42. The supply is made by a duct 41 held on), and these cylinders are attached to each other by means of a connecting portion 43. This hydraulic cylinder 40 is mounted using a screw 45 on the L-shaped support 44, which acts as a fastening point for the protective plate 22 and the front claw 7. These supports 44 are spaced at regular intervals and are also located on the base plate 4 by two fastening screws. The plate 46, which is angled at the end, is positioned opposite the hydraulic cylinder 40, and stands on one of the two main edges and welded to the claw support 25. While pressurizing the hydraulic circuit for supplying the hydraulic cylinder 40, the shaft 47 of such a hydraulic cylinder placed on the plate 46 pushes the claw support 25 in front of these plates. At this time, the rear claw 6 associated with the claw support 25 is opened.

The closing of the rear claw 6 is achieved by using a plurality of compression springs 48 which push back to allow the longitudinal claw support 25 to longitudinally close after releasing the pressure in the hydraulic cylinder. Each spring 48 is guided by a rod 49 of thread that extends through the pin plate on which one end of this spring rests. The second end of the spring 48 rests on the plug 50, which is screwed into the retaining block 51 held on the base plate by two screws 52. The retaining block 51 also acts as a fixed support for the second fin guard plate 53 which partially covers the claw support 25. This guard plate 53 is attached to its base using a plurality of screws 54 (FIGS. 1A and 1B) disposed in the retaining block 51 and also has a circular opening for accommodating the plug 50. .

Lateral positioning of the printing plate 19 on the front claw 5 is chased at the top of the front claw 5 and centered pins 55 (figure 4) accurately positioned on the longitudinal axis of the printing press. Is secured by

In FIG. 5B, the fastener 60 attached to the end C.C of the base plate 4 by the screw 61 is shown. The roller 11 is located on the longitudinal axis of this fastener by the screw 62. Two openings 63 in the vicinity of the first and last 1/3 points of the base plate 4 are substantially larger than the diameters of the two bushings 64 extending through these openings (FIG. 3). If the dimensions of the opening 63 are excessive, it is possible to provide a necessary place by the support means 102 by the movement of the base plate 4 which is flattened at the bottom of the groove 1, which is the rotation of the plate-shaped cylinder. This is to control the action of the centrifugal force on the test base plate (4). The support means 102 consist of a bushing 64 and two bearing shells 65 made of a synthetic material having a low coefficient of friction allow this base plate around this bushing to facilitate movement of the base plate 4. Grab a sandwich. Compression spring 66 disposed between two different washers 67, 68, and screw 69 screwed to the bottom of groove 1 after it is placed on top washer 68 and extends through bushing 64. The base plate 4 is fixed and held in a plane parallel to the site of the plate-shaped cylinder. The fastener 60 also has an opening 70 through which the screw 71 extends, all of which have the same respective functions as the above-described opening 63 and screw 69.

As shown in FIGS. 5A and 5B, two rectangular openings 72 cut out from the base plate 4 may receive a cam CC 17 and a cam COC 18 fastened to the plate-shaped cylinder 3. Can be. This opening 72 has a size larger than the dimensions of the base 80 of the cams 17, 18 because of the free movement of the base plate 4 around this cam without contacting one of the cams. This should be possible. The openings 72 are transversely bounded at three sides with three aligned openings, among which the central openings 73 accurately position the ribs 74 by two cylindrical pins 75, of which The end opening 74 is adapted to fix the frame 74 on the base plate 4 by a screw 77. As shown in FIGS. 6 and 7, the ribs 74 form two bridges, which are fastened to the base plate and disposed above the cams 16, 17, and also the maximum plane of the bridge. Are screwed from the underside of the rollers 15 and 16 sliding on each of the cams 17 and 18. The screw 78 secures the front claw 5 and the guard plate 22 above the root 74.

The cams 16, 17 are mutually symmetrical, with the opening adapted to receive the centering pin 81 on the one hand and the two screws 82 screwed to the plate-shaped cylinder 3 on the other hand sliding. To a stepped foundation 80 with two fixed openings 83. Two small protrusions 84 constituting the core of the cam, which are triangular over this foundation 80, are raised, between which the rollers 15 or 16 slide according to the cam CC or COC considered. .

In order to better understand the working principle of the mechanism of the present invention, three different positions occupied by the positioning device of the printing plate are schematically illustrated in FIGS. 8A, 8B and 8C. If no bias is provided in the printing plate, the arrangement of the mechanism will be in an intermediate position corresponding to the schematic of FIG. 8A.

If the printing plate is to be biased in one direction or another, it is possible to activate the biasing mechanism of the printing plate by simple lateral movement of the plate-shaped cylinder in the direction of its axis of rotation 2. The lateral movement of the plate-like cylinder 3 is controlled by means 101 consisting of an electric motor connected to a screw wheel that engages in a worm form. This conventional mechanism converts the circular motion of the motor shaft into the linear motion required according to the lateral motion of the plate cylinder. The movement of the plate cylinder by the motor and by such a device is also automated due to the sensors sensing the lateral movement of the plate cylinder. This sensor is connected to an external electronic controller (not shown) that controls the motor 101 of the means. Thus, for a given task, the bias of the printing plate is easily controlled and stored by the electronic controller by simply remembering the lateral movement of the plate-shaped cylinder via the position sensor.

As shown in FIG. 8B, when the cylinder moves from C.O.C to C.C, the roller 11 lies against the side 12 of the cam ring 14 after any stroke. It is guided by rollers 15, 16 sliding on cams 17, 18 and pivoting of base plate 4 about roller 11 and along side 12 of cam ring 14. It is the result of the combined movement of the base plate 4 consisting of the translational movement of this base plate, characterized by the sliding motion of the upper part of the roller 11. The slide 9 of the rear claw 6, which slides only in the longitudinal direction on the roller 10, is subjected to rotational and translational movement about a fixed pivot made of such roller 10 fastened to the plate-like cylinder 3. Allow. Due to the longitudinal orientation of this slide, no movement along the axis 2 is transmitted to the rear claw 6. Thus, due to this rear claw 6 not moving in a direction parallel to the axis 2 of the plate-like cylinder, and also due to the engagement movement along the front claw 5, the front and rear edges of the plate-like plate are parallel to each other. Can be precisely biased for shearing movement.

8 shows the same engagement motion resulting from the motion of the plate cylinder 3 from CC to COC in the opposite direction, in which case the roller 11 is positioned so that the opposite of the cam ring 14 Slip along side (13).

In order to correct the bias positioning of the printing plate 19, the actuator loosens and detaches the printing plate from the plate-shaped cylinder by influencing a control part which releases the pressure of the hydraulic cylinder 40 slightly, and also in one direction or another direction. Activates the motor of the means 101 for moving the plate-shaped cylinder 3. When the roller 11 in contact with one side 12 or 13 of the cam ring 14 moves along this cam ring 14 by a distance corresponding to a desired bias, the plate-shaped cylinder 3 is oppositely opposite. Move in the direction and reposition the loader according to the side register suitable for printing. The movement of the plate-shaped cylinder does not change the bias of the printing plate 19 at all because the roller 11 is not immediately released from the side of the cam ring 14 during this opposite movement. Due to the adhesion of the printing plate taut on the plate-shaped cylinder, the bias position of the printing plate remains. The position of the side registers of the plate-shaped cylinders is known so that the bias of the plate-plates by these angles can be easily automated by simply introducing angle values into the electronic controller, if desired.

Therefore, the positioning and biasing operation of the printing plate on the plate cylinder in which the apparatus according to the present invention is installed is performed in the following steps, namely

a) opening the rear claw 6 by a hydraulic cylinder 40 compressing the spring 48,

b) fastening the front edge of the printing plate 19 at the notch 7 of the front claw 5 and at the centering pin 55,

c) rotate the plate-shaped cylinder 3 at a low speed about its axis 2 to wind the printing plate 19 around the cylinder,

d) fastening the rear edge of the printing plate 19 in the notch 8 of the rear claw 6,

e) closing the rear claw 6 by releasing the pressure in the hydraulic cylinder 40,

f) operating the hydraulic cylinder 40 to slightly remove the printing plate 19 from the cylinder for biasing and also rotating the plate-shaped cylinder 3 at high speed,

g) operating the printing plate 19 to be biased by laterally moving the plate cylinder 3 by any distance corresponding to the desired inclination,

h) laterally moving the plate cylinder 3 oppositely to restore the side registers necessary for printing, and

i) limited to releasing pressure in the hydraulic cylinder 40.

In addition to rotating the printing plate about the cylinder, the intention to bias the printing plate of the present invention and the use of specific mechanisms can facilitate the aforementioned interactions with ease. When resuming a previous print job, if the previously known adjustments are remembered, then effectively no manual adjustment of the printing plate is necessary for such a device. Finally, it can be seen that such a device also enables biasing of the printing plate when the plate cylinder rotates at full speed. Therefore, the printer does not need to stop to correct the inclination position of the printing plate, thereby significantly reducing the service execution cost when preparing a new print job. Various modifications may be added within the scope of the claims of the present invention.

The present invention relates to a positioning device of a flexible printing plate on a plate cylinder, in particular an apparatus for biasing such a flexible printing plate on a plate cylinder of a rotary printing machine, in accordance with the invention on the one hand an actuator provided in advance for lateral adjustment of the printing plate. This allows for a more rational use of, and on the other hand it is cost effective and small in volume but has the effect of obtaining a biasing mechanism that is rigid and reliable and easy to apply to plate cylinders without using such a mechanism.

Claims (10)

A positioning device for positioning a flexible printing plate 19 on a plate-shaped cylinder 3, the device capable of biasing the printing plate in a rotary printing press, the plate-shaped cylinder 3 having a rotational axis 2 having a rotational axis 2 A positioning device in which the positioning device of the printing plate is disposed, the positioning device being operated by the lateral movement of the plate-shaped cylinder 3 Wherein the plate-shaped cylinder is operated by an outer means 101 fastened to the frame of the printing machine and by a cam ring 14, the cam ring being disposed outside of the cylinder facing the means 101, the cam On the inner edges 12, 13 of the ring a roller 11 fastened to a movable base plate 4 freely held relative to the plate-shaped cylinder 3 by means of a support means 102 and two cams 17, 18. Let go The cam, which is firmly attached on the bottom of the groove 1 of the plate-shaped cylinder 3, controls the movement of the two rollers 15, 16 attached to the base plate 4 by opposing oblique movement. Positioning device characterized in that. The external means (101) for causing the operation of the positioning device of the printing plate is made up of a mechanism and a motor which allow conventional lateral movement of the plate-shaped cylinder 3 along the rotational axis 2, And a plurality of controllers configured to measure and store the direction and value of the lateral motion of the plate-shaped cylinder using a conventional sensor arranged in the frame of the printing machine. 2. The cam (1) according to claim 1, wherein each of said cams (17, 18) is rectangular and is located exactly at the bottom of the groove (1) of the plate cylinder (3) by means of screws (82) and at least one centering pin (81). And a base 80 fixed thereon, on which also two projections 84 are located, the projections being triangular while the rollers 15 and 16 intersect the longest surfaces of this triangular projection. And the longest surfaces are oriented about 30 degrees with respect to the axis of rotation (2) of the plate-shaped cylinder (3). 2. The rectangular opening 72 according to claim 1, wherein the base plate 4 has a dimension larger than that of the base 80 in the area occupied by the cams 17 and 18 for passage. A plurality of openings 73 and 76 flanged to each opening 72 can firmly and accurately fix the two roots 74 supporting the rollers 15 and 16 in this opening. And the other openings 63 spaced apart at regular intervals arrange therein the support means 102 of the base plate 4 to the plate-shaped cylinder 3 therein, and the base plate 4 also has a front claw ( 5), the length of this front claw is substantially the same as the length of the groove 1, the claw is firmly attached to the groove by the block 20 and the support 40, and the rear claw 6 Is arranged to face the front claw 5 and is held by the fastening means 103 on the claw support 25. It said, the claw support (25) is a positioning device as claimed in only one direction parallel to the longest side of the base plate 4, the possible movement independently of the rear claw (6). 2. A support according to claim 1, wherein each support means (102) consists of a bushing (64), a compression spring (66) and an upper washer (68), the diameter of which is the diameter of the opening (63) through which the bushing passes. A little smaller, the bushing 67 placed on the bearing shell 65 attached in position on the base plate 4 is continuously stacked around the bushing, and the groove 1 of the plate-shaped cylinder 3 is laminated. And a head of a screw (69) extending through the bushing (64) overlying the washer for screwing into the bottom of the shell. 5. The roots (74) according to claim 4, wherein the roots (74) constitute a bridge, and on the maximum surface of the bridges are screwed from the bottoms of the rollers (15, 16), the roots of which are placed above each cam (17, 18). The device characterized in that it is arranged and fixed on the base plate (4). 5. The claw support portion 25 is made of a metal plate, the length of the metal plate being substantially the same as the length of the front claw 5, the metal plate being at regular intervals in a direction parallel to the long side of the metal plate. A plurality of elongated holes 26 are provided, through which the fastening organ 103 composed of studs 27 extends, the studs having a rear claw 6 on the claw support 25. Is held at the end by two support parts 32 oriented perpendicular to the length of the base plate 4 and screwed to the base plate 4. Mounted on at least two blocks 30, each sliding on a retained axis 31 such that the rear claw 6 and the claw support 25 realize such closing and opening of the rear claw 6 during such movement. Slip along the axis 31 Device characterized in that it can exercise. 8. The closing of the rear claw (6) is secured by a plurality of compression springs (48), the plurality of compression springs being located on a retaining block (51) fastened to the base plate (4). Pushing the rear claw 6 toward the front claw 5 by means of a plurality of plates 46, the plurality of plates being placed upright at right angles to the front claw support 25, and on the lower surface of the front claw. Apparatus characterized in that the fastening. 9. The opening of the rear claw 6 is operated by a plurality of hydraulic cylinders fixed on the support 44, and the shafts 47 of the plurality of hydraulic cylinders are springs 48. Device pushes the plate 46 backward to compress it. 9. A retaining screw hole for the passage of each compression spring 48 is provided in each retaining block 51, in which a plug 50 acting as a seat for the spring 48 is screwed. Device characterized in that.