Bag opening width adjusting structure of bag opening machine

Abstract

The utility model provides a bag opening width adjusting structure of a bag opening machine, and belongs to the technical field of bag opening machines. The bag opening machine solves the problem that in the prior art, the end of a drawing component and the end of an upper pressing component of an existing bag opening machine cannot be kept flush with each other. The bag opening width adjusting structure of the bag opening machine comprises a machine base, two oppositely-arranged edge folding limiting plates and two upper pressing plates arranged below the edge folding limiting plates respectively, and the machine base is provided with two installation bases capable of horizontally moving front and back relative to the machine base and being locked. The edge folding limiting plate and the upper pressing plate which are located on the same side are arranged on the same installation base, a first air cylinder is further fixed to the installation base, and an output shaft of the first air cylinder is vertically arranged and can drive the upper pressing plate to move downwards relative to the machine base. The bag opening machine has the advantage that the end part of the drawing part of the bag opening machine is always flush with the end part of the upper pressing part.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of bag opening machine, and relates to a bag opening machine's bag mouth width adjusting structure. BACKGROUND

[0002] The bag opening machine (or called bag opening sewing machine, bag opening equipment, etc.) is a kind of equipment specially used for the sewing of pocket, zipper and other parts in clothing, luggage and other industries, such as a kind of bag opening machine and bag opening process disclosed in Chinese patent document (application number: 202410618645.5), the edge folding forming module includes base, pull mechanism and upper pressing mechanism, wherein the base is drivingly connected with Y direction moving mechanism, the upper pressing mechanism includes upper pressing component and upper pressing power connected with the base, the upper pressing power is drivingly connected with the upper pressing component, the pull mechanism includes pull component and pull power connected with the base, the pull component is movably arranged along Y direction, the pull power is drivingly connected with the pull component, the pull component is arranged between the lower pressing mechanism and the upper pressing component, the pull component is clamped with the lower pressing mechanism, the pull power is used to drive the pull component to move to position one in the direction of the edge folding device, and the bag edge sheet on the corresponding side is pressed on the edge folding structure, so that the bag edge sheet forms a bending, the upper pressing power is used to drive the upper pressing component to press the bent bag edge sheet, and the pull power is also used to drive the pull component to move to position two in the direction away from the edge folding device, so that the pull component exits the edge folding structure. In implementation, the pull power can preferentially adopt a pneumatic cylinder, one end of the pneumatic cylinder can be connected with the base, the other end is connected with the pull component, the pneumatic cylinder is arranged along Y direction, so that the pneumatic cylinder can be stretched and contracted along Y direction, thereby adjusting the position of the pull component along Y direction through the stretching and contraction of the pneumatic cylinder. Similarly, in implementation, the upper pressing power can also preferentially adopt a pneumatic cylinder, one end of the pneumatic cylinder is connected with the base, the other end is connected with the upper pressing component, and the pneumatic cylinder is stretched and contracted along Z direction, so as to drive the upper pressing component to vertically ascend and descend by using the pneumatic cylinder.

[0003] The above-mentioned bag opening machine has the following deficiencies in the use process: in the initial state, the end of the pull component of the bag opening machine is flush with the end of the upper pressing component, but the upper pressing component of the bag opening machine driven by the upper pressing power (i.e. pneumatic cylinder) can only vertically ascend and descend along Z direction, when the bag mouth width needs to be adjusted, the pull component is horizontally moved along Y direction by the pull power, and the position of the upper pressing component along Y direction cannot be adjusted, so that the end of the pull component and the end of the upper pressing component cannot continue to be flush, specifically, when the required processing bag mouth opening is a "H-shaped" seam with relatively narrow gap, the distance between the two upper pressing components needs to be further reduced, so that the end of the pull component protrudes from the end of the upper pressing component, thereby making the effect of the upper pressing component on pressing the bent bag edge sheet not good. SUMMARY

[0004] The utility model discloses a bag mouth width adjusting structure of bag opening machine, which can solve the problem that the end of the pulling component and the end of the upper pressing component of the existing bag opening machine cannot be kept flush.

[0005] The utility model discloses a bag mouth width adjusting structure of bag opening machine, which can solve the problem that the end of the pulling component and the end of the upper pressing component of the existing bag opening machine cannot be kept flush.

[0006] A bag mouth width adjusting structure of bag opening machine, comprising a base, two oppositely arranged edge folding limiting plates and two upper pressing plates arranged below the edge folding limiting plates, characterized in that two mounting seats capable of moving horizontally and being locked relative to the base are arranged on the base, the edge folding limiting plates and the upper pressing plates on the same side are arranged on the same mounting seat, a first air cylinder is fixed on the mounting seat, and the output shaft of the first air cylinder is arranged vertically and can drive the upper pressing plate to move downward relative to the base.

[0007] Compared with the prior art, the bag mouth width adjusting structure of the bag opening machine adds mounting seats on the base, and the edge folding limiting plates and the upper pressing plates are arranged on the mounting seats, so that the edge folding limiting plates and the upper pressing plates can move synchronously forward and backward, the end of the edge folding limiting plate and the end of the upper pressing plate can be kept flush, the problem that the end of the pulling component and the end of the upper pressing component of the existing bag opening machine cannot be kept flush is solved, and meanwhile, the first air cylinder for driving the upper pressing plate to move downward relative to the base and away from the edge folding limiting plate is arranged on the mounting seat, so that the edge folding mechanism can drive the bag edge piece on the same side to bend under the cooperation of the edge folding limiting plate, then the upper pressing plate can reset and press the bent bag edge piece, so that the edge folding work of the long edge on one side of the bag mouth is completed, and the edge folding work of the long edge on the other side of the bag mouth is repeated, so that subsequent sewing or other operations can be performed.

[0008] In the bag mouth width adjusting structure of the bag opening machine, the mounting seat is further provided with a fixed seat capable of moving horizontally and being locked relative to the mounting seat, and the edge folding limiting plate is connected to the fixed seat, so that the bag mouth width adjusting structure of the bag opening machine can also realize the independent forward and backward movement of the edge folding limiting plate, and the adaptive adjustment of the bag mouth width of the bag opening machine is more convenient.

[0009] In the bag mouth width adjusting structure of the bag opening machine, the two sides of the fixed seat are respectively provided with a first strip-shaped positioning hole arranged in the forward and backward directions, and the edge folding limiting plate is connected to the fixed seat through two first fastening bolts respectively penetrating the first strip-shaped positioning holes, so that the independent forward and backward movement of the edge folding limiting plate is more convenient.

[0010] In the bag opening width adjusting structure of the bag opening machine, the mounting base is further fixed with a second cylinder and a first sliding rail, the fixed base is slidingly connected to the first sliding rail arranged in the front-rear direction through a first sliding block, the output shaft of the second cylinder is horizontally arranged and connected to the fixed base, the middle part of the fixed base has a clearance gap, and the second cylinder is arranged adjacent to the first cylinder and located in the clearance gap. Therefore, the bag opening width adjusting structure of the bag opening machine is more compact, the position adjustment of the fixed base is more convenient, and in addition to the second cylinder driving, the fixed base can also be driven by a screw nut structure.

[0011] In the bag opening width adjusting structure of the bag opening machine, the base is fixed with a second sliding rail and two fixed blocks, the fixed blocks are threadedly connected with horizontally arranged positioning bolts, the mounting base is slidingly connected to the second sliding rail arranged in the front-rear direction through a second sliding block, the side of the mounting base is connected with a limiting block, the limiting block is located between the two fixed blocks, and the two positioning bolts are respectively abutted on the two side walls of the limiting block. Therefore, the front-rear position adjustment of the mounting base is more convenient.

[0012] In the bag opening width adjusting structure of the bag opening machine, the upper pressing plate is connected to the mounting base through a resilient sheet, the bottom of the base has an upwardly recessed embedding groove, the resilient sheet is arranged in the embedding groove and limited by the groove walls in the left-right direction, and the resilient sheet can be elastically deformed. The first cylinder is used to drive the resilient sheet to elastically deform the one end of the upper pressing plate downward, so that the upper pressing plate moves downward relative to the base and moves away from the edge limiting plate, so that the edge folding mechanism drives the bag edge piece on this side to be bent under the cooperation of the edge limiting plate, then the edge folding mechanism and the first cylinder are reset, the resilient sheet returns and compresses the bent bag edge piece under the action of the elastic force, and in addition, the structure of the resilient sheet can also be used. The upper pressing plate is connected to the mounting base through a connecting plate, the output shaft of the first cylinder is vertically arranged and connected to the middle part of the connecting plate to drive the upper pressing plate to vertically ascend and descend.

[0013] In the bag opening width adjusting structure of the bag opening machine, the mounting base has two second strip-shaped positioning holes arranged in the front-rear direction, and the resilient sheet is connected to the mounting base through two second fastening screws respectively penetrating the second strip-shaped positioning holes. Therefore, the bag opening width adjusting structure of the bag opening machine can realize the separate front-rear movement of the upper pressing plate, and the adaptive adjustment of the bag opening width of the bag opening machine is more convenient.

[0014] In the bag mouth width adjusting structure of the bag opening machine, the base has a socket, the left and right side edges of the socket have sunken step portions, the two sides of the edge limiting plate have protruding portions, and the two protruding portions abut against the two step portions. The sunken step portions and the protruding portions can guide and limit the forward and backward movement of the edge limiting plate.

[0015] In the bag mouth width adjusting structure of the bag opening machine, the base is fixed with a second sliding rail and a motor, the output shaft of the motor is horizontally arranged and connected with a screw rod rotatably arranged on the base, the mounting seat is slidably connected with a second sliding block on the second sliding rail arranged in the forward and backward direction, and the side of the mounting seat is connected with a limiting block threadedly connected with the screw rod. The forward and backward movement of the mounting seat is more convenient while ensuring accuracy.

[0016] In the bag mouth width adjusting structure of the bag opening machine, the side of the two upper pressing plates adjacent to each other is comb-shaped. The side of the two upper pressing plates adjacent to each other is comb-shaped, which can ensure the effect of pressing the bent bag edge piece and facilitate subsequent sewing operation.

[0017] Compared with the prior art, the bag mouth width adjusting structure of the bag opening machine has the advantages that the bag mouth width adjusting structure of the bag opening machine can realize the synchronous forward and backward movement of the edge limiting plate and the upper pressing plate, so that the end of the edge limiting plate and the end of the upper pressing plate can be arranged in the same plane, thereby solving the problem that the end of the pulling component and the end of the upper pressing component of the existing bag opening machine cannot be arranged in the same plane. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective structural schematic view of the bag mouth width adjusting structure of the bag opening machine in embodiment one.

[0019] Figure 2 is Figure 1 is a partial enlarged view of A in

[0020] Figure 3 is a perspective structural schematic view of the bag mouth width adjusting structure of the bag opening machine in embodiment one.

[0021] Figure 4 is Figure 3 is a partial enlarged view of B in

[0022] Figure 5 is a perspective structural schematic view of the bag mouth width adjusting structure of the bag opening machine in embodiment one.

[0023] Figure 6 is a perspective structural schematic view of the bag mouth width adjusting structure of the bag opening machine in embodiment one.

[0024] Figure 7 is a sectional view of the bag mouth width adjusting structure of the bag opening machine in embodiment one.

[0025] Figure 8 is a structural schematic view of the bag mouth width adjusting structure of the bag opening machine in embodiment two.

[0026] In the figure, 1, base; 1a, embedded groove; 1b, socket; 1c, step part; 2, edge folding limiting plate; 2a, protruding part; 3, upper pressing plate; 4, mounting seat; 4a, second strip-shaped positioning hole; 5, first air cylinder; 6, fixed seat; 6a, first strip-shaped positioning hole; 6b, accommodation gap; 7, first fastening bolt; 8, second air cylinder; 9, first sliding rail; 10, first sliding block; 11, second sliding rail; 12, fixed block; 13, positioning bolt; 14, second sliding block; 15, limiting block; 16, rebounding sheet; 17, second fastening bolt; 18, motor; 19, screw rod. DETAILED DESCRIPTION

[0027] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0028] Embodiment one

[0029] A bag mouth width adjusting structure of a bag opening machine, referring to Figures 1-7 , comprising a base 1, two oppositely arranged edge folding limiting plates 2 and two upper pressing plates 3 arranged below the edge folding limiting plates 2 respectively, two mounting seats 4 capable of moving horizontally and being locked relative to the base 1 are arranged on the base 1, the edge folding limiting plates 2 and the upper pressing plates 3 located on the same side are arranged on the same mounting seat 4 respectively, a first air cylinder 5 is further fixed on the mounting seat 4, the first air cylinder 5 in the embodiment is preferably a top pin air cylinder, the output shaft of the first air cylinder 5 is arranged vertically and can drive the upper pressing plate 3 to move downward relative to the base 1 to move away from the edge folding limiting plate 2.

[0030] Specifically, referring to Figures 1-7 , a second air cylinder 8 and a first sliding rail 9 are further fixed on the mounting seat 4, the fixed seat 6 is slidably connected on the first sliding rail 9 arranged in the front-rear direction through a first sliding block 10, the output shaft of the second air cylinder 8 is arranged horizontally and connected with the fixed seat 6, the middle part of the fixed seat 6 has an accommodation gap 6b, the second air cylinder 8 is arranged adjacent to the first air cylinder 5 and both are located in the accommodation gap 6b.

[0031] More specifically, referring to Figures 1-7The second slide rail 11 and two fixed blocks 12 are fixed on the base 1, the fixed blocks 12 are threadedly connected with horizontally arranged positioning bolts 13, the mounting seat 4 is slidingly connected on the second slide rail 11 arranged along the front-back direction through a second sliding block 14, the side of the mounting seat 4 is connected with a limiting block 15, the limiting block 15 is located between the two fixed blocks 12, and the two positioning bolts 13 abut on the two side walls of the limiting block 15 respectively.

[0032] Further, referring to Figures 1-7 The mounting seat 4 is further provided with a fixed seat 6 capable of moving horizontally and being locked relative to the mounting seat 4, and the folding-limiting plate 2 is connected to the fixed seat 6. Specifically, the fixed seat 6 has two first strip-shaped positioning holes 6a arranged along the front-back direction on the two sides respectively, and the folding-limiting plate 2 is connected to the fixed seat 6 through two first fastening bolts 7 respectively penetrating the first strip-shaped positioning holes 6a.

[0033] Specifically, referring to Figures 1-7 The upper pressing plate 3 is connected to the mounting seat 4 through a resilient piece 16, the bottom of the base 1 has an upwardly recessed embedding groove 1a, the resilient piece 16 is arranged in the embedding groove 1a and is limited by the groove wall of the embedding groove 1a in the left-right direction, and the resilient piece 16 can be elastically deformed. More specifically, the mounting seat 4 has two second strip-shaped positioning holes 4a arranged along the front-back direction, and the resilient piece 16 is connected to the mounting seat 4 through two second fastening bolts 17 respectively penetrating the second strip-shaped positioning holes 4a.

[0034] Further, referring to Figures 1-7 The base 1 has a socket 1b, the left and right side edges of the socket 1b have sunken step portions 1c, the folding-limiting plate 2 has two protruding portions 2a on the two sides, and the two protruding portions 2a abut on the two step portions 1c respectively. In this embodiment, the side of the two upper pressing plates 3 adjacent to each other is comb-shaped.

[0035] The bag opening width adjusting structure of the bag opening machine can realize the synchronous front-back movement of the folding-limiting plate 2 and the upper pressing plate 3, so that the end of the folding-limiting plate 2 and the end of the upper pressing plate 3 can be arranged in a flush manner. Meanwhile, the bag opening width adjusting structure of the bag opening machine can also realize the separate front-back movement of the folding-limiting plate 2 and the upper pressing plate 3, so that the adaptive adjustment of the bag opening width of the bag opening machine is more convenient.

[0036] The working principle of the bag opening width adjusting structure of the bag opening machine is described as follows:

[0037] According to the width size of the bag opening to be processed, the operator controls one of the positioning bolts 13 to advance or retreat a certain distance, and then the operator controls the other positioning bolt 13 to follow the distance (i.e. retreat or advance), so that the two positioning bolts 13 are repositioned on the two side walls of the limiting block 15 respectively, so that the mounting seat 4 can also advance or retreat the distance, since the edge-limiting plate 2 and the upper pressing plate 3 are both arranged on the mounting seat 4, the edge-limiting plate 2 and the upper pressing plate 3 can move synchronously with the mounting seat 4, so that the end of the edge-limiting plate 2 and the end of the upper pressing plate 3 can be kept flush, and the edge-limiting plate 2 is kept at the position of the edge-limiting mechanism, and then the first cylinder 5 is used to drive the resilient sheet 16 to elastically deform the end of the upper pressing plate 3 downward, so that the upper pressing plate 3 moves downward relative to the base 1 and away from the edge-limiting plate 2, so that the edge-limiting mechanism drives the bag edge piece on this side to bend under the cooperation of the edge-limiting plate 2, and then the edge-limiting mechanism and the first cylinder 5 are reset, and the resilient sheet 16 returns and presses the bent bag edge piece under the action of the elastic force, so that the edge folding work of the long side of one side of the bag opening is completed, so as to carry out subsequent sewing or other operations. Similarly, the edge folding work of the long side of the other side of the bag opening repeats the above steps.

[0038] In addition, since the two sides of the fixing seat 6 are respectively provided with a first strip-shaped positioning hole 6a arranged in the front-back direction, the edge-limiting plate 2 is connected with the fixing seat 6 through two first fastening bolts 7 respectively penetrating the first strip-shaped positioning hole 6a, so that the edge-limiting plate 2 can move forward and backward relative to the fixing seat 6, so that the edge-limiting plate 2 can also be adjusted in position forward and backward independently; similarly, since the resilient sheet 16 is connected with the mounting seat 4 through two second fastening bolts 17 respectively penetrating the second strip-shaped positioning hole 4a, the upper pressing plate 3 connected with the resilient sheet 16 can move forward and backward relative to the mounting seat 4, so that the upper pressing plate 3 can also be adjusted in position forward and backward independently, so that the adaptability adjustment of the bag opening width of the bag opening machine is more convenient.

[0039] Embodiment Two

[0040] The structure and principle of this embodiment and embodiment one are basically the same, and the difference lies in that Figure 8 the base 1 is provided with a second sliding rail 11 and a motor 18, the output shaft of the motor 18 is horizontally arranged and connected with a screw rod 19 rotatably arranged on the base 1, the mounting seat 4 is slidably connected with the second sliding block 14 on the second sliding rail 11 arranged in the front-back direction, and the side of the mounting seat 4 is connected with a limiting block 15 which is threadedly connected with the screw rod 19.

[0041] The working principle of the bag opening width adjustment structure of the bag opening machine of this embodiment is described below:

[0042] According to the width size of the bag opening to be processed, the operator starts the motor 18, the motor 18 drives the screw rod 19 to rotate synchronously, the limiting block 15 threaded with the screw rod 19 advances or retreats a certain distance, that is, makes the mounting seat 4 advance or retreat the distance, since the edge-limiting plate 2 and the upper pressing plate 3 are both arranged on the mounting seat 4, the edge-limiting plate 2 and the upper pressing plate 3 can move synchronously with the mounting seat 4, so that the end of the edge-limiting plate 2 and the end of the upper pressing plate 3 can be arranged in parallel, and the edge-limiting plate 2 stays at the position adapted to the edge-folding mechanism, then the first cylinder 5 is used to drive the resilient sheet 16 to make the end of the upper pressing plate 3 elastically deform downward, so that the upper pressing plate 3 moves downward relative to the base 1 and moves away from the edge-limiting plate 2, so that the edge-folding mechanism drives the bag edge piece on this side to bend under the cooperation of the edge-limiting plate 2, then the edge-folding mechanism and the first cylinder 5 reset, the resilient sheet 16 returns and presses the bent bag edge piece under the action of the elastic force, so as to complete the edge-folding work of the long edge on one side of the bag opening, so as to carry out sewing or other operations subsequently, and similarly, the edge-folding work of the long edge on the other side of the bag opening repeats the above steps.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0044] Although the terms base 1, embedded groove 1a, spigot 1b, stepped portion 1c, edge-limiting plate 2, etc. are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present application; any kind of additional limitation by interpreting them is contrary to the spirit of the present application.

Claims

1. A bag mouth width adjusting structure of a bag opening machine, comprising a machine base (1), two oppositely arranged edge folding limiting plates (2) and two upper pressing plates (3) respectively arranged below the edge folding limiting plates (2), characterized in that, Two mounting seats (4) capable of moving horizontally and locking relative to the base (1) are arranged on the base (1), the folding edge limiting plate (2) and the upper pressing plate (3) on the same side are arranged on the same mounting seat (4), a first air cylinder (5) is further fixed on the mounting seat (4), and an output shaft of the first air cylinder (5) is vertically arranged and capable of driving the upper pressing plate (3) to move downward relative to the base (1).

2. The bag opening width adjusting structure of a bag opener according to claim 1, wherein A fixing seat (6) capable of moving horizontally and locking relative to the mounting seat (4) is further arranged on the mounting seat (4), and the folding edge limiting plate (2) is connected to the fixing seat (6).

3. The bag opening width adjusting structure of a bag opener according to claim 2, wherein The fixing seat (6) is provided with a first strip-shaped positioning hole (6a) arranged in the front-rear direction on each side, and the folding edge limiting plate (2) is connected to the fixing seat (6) through two first fastening bolts (7) penetrating the first strip-shaped positioning holes (6a) respectively.

4. The bag opening width adjusting structure of claim 2, wherein A second air cylinder (8) and a first sliding rail (9) are further fixed on the mounting seat (4), the fixing seat (6) is slidably connected to the first sliding rail (9) arranged in the front-rear direction through a first sliding block (10), an output shaft of the second air cylinder (8) is horizontally arranged and connected to the fixing seat (6), the middle part of the fixing seat (6) is provided with a gap (6b), the second air cylinder (8) is arranged adjacent to the first air cylinder (5) and located in the gap (6b).

5. The bag opening width adjusting structure of a bag opener according to claim 1 or 2 or 3 or 4, characterized in that, A second sliding rail (11) and two fixing blocks (12) are fixed on the base (1), the fixing blocks (12) are threadedly connected with positioning bolts (13) arranged horizontally, the mounting seat (4) is slidably connected to the second sliding rail (11) arranged in the front-rear direction through a second sliding block (14), the side of the mounting seat (4) is connected with a limiting block (15), the limiting block (15) is located between the two fixing blocks (12), and the two positioning bolts (13) abut against the two side walls of the limiting block (15) respectively.

6. The bag opening width adjusting structure of a bag opener according to claim 1 or 2 or 3 or 4, wherein The upper pressing plate (3) is connected to the mounting seat (4) through a resilient sheet (16), the bottom of the base (1) is provided with an upwardly recessed embedding groove (1a), the resilient sheet (16) is arranged in the embedding groove (1a) and limited in the left-right direction by the groove wall of the embedding groove (1a), and the resilient sheet (16) can be elastically deformed.

7. The bag opening width adjusting structure of a bag opener according to claim 6, wherein The mounting seat (4) is provided with two second strip-shaped positioning holes (4a) arranged in the front-rear direction, and the resilient sheet (16) is connected to the mounting seat (4) through two second fastening bolts (17) penetrating the second strip-shaped positioning holes (4a) respectively.

8. The bag opening width adjusting structure of a bag opener according to claim 1 or 2 or 3 or 4, wherein The base (1) is provided with a socket (1b), the left and right sides of the socket (1b) are provided with sunken step portions (1c), the folding edge limiting plate (2) is provided with protruding portions (2a) on both sides, and the two protruding portions (2a) abut against the two step portions (1c) respectively.

9. The bag opening width adjusting structure of a bag opener according to claim 1 or 2 or 3 or 4, wherein The base (1) is fixed with a second slide rail (11) and a motor (18), the output shaft of the motor (18) is horizontally arranged and is connected with a screw rod (19) which is rotatably arranged on the base (1), the mounting base (4) is slidably connected with a second slide block (14) on the second slide rail (11) arranged in the front-back direction, the side of the mounting base (4) is connected with a limiting block (15), and the limiting block (15) is threadedly connected on the screw rod (19).

10. The bag opening width adjusting structure of a bag opener according to claim 1 or 2 or 3 or 4, wherein Two sides of the upper pressing plates (3) adjacent to each other are comb-shaped.

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