Self-adhesive label equipment

Through the self-adhesive label equipment that integrates the functions of glue coating and film coating, the design of the first glue table and the coating shaft is solved, and the production time problem caused by the separate operation of the glue coating and film coating steps in the prior art is improved, and the production efficiency is improved.

CN223147948UActive Publication Date: 2025-07-25GUANGDONG QIANRUN MASCH TECH CO LTD
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Patent Information

Application Number
CN202422442478.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-10
Publication Date
2025-07-25
Estimated Expiration
2034-10-10

AI Technical Summary

Technical Problem

The existing glue and coating steps require the use of two machines respectively, resulting in increased operation steps and extended production time.

Method used

A self-adhesive label equipment is designed to integrate the glue coating and coating functions, and uniformly apply glue through the first glue table and the glue coating shaft, and the glue coating shaft is driven to rotate by a rubber stop plate and a motor to simplify the operation process.

Benefits of technology

The integrated operation of glue coating and film coating is achieved, reducing production steps and improving production efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses self-adhesive label equipment, and relates to the technical field of self-adhesive labels, and the self-adhesive label equipment is characterized in that a first glue table is mounted on the surface of the top end of a bottom surface gluing box, a glue blocking plate is mounted on the surface of the top end of the first glue table, and a first mounting hole is formed in the surface of one side of the bottom surface gluing box; a first transmission rod is mounted on the inner wall of a first mounting hole, when adhesive sticker flows to the bottom of the first adhesive table and then makes contact with an adhesive blocking plate, the adhesive blocking plate gathers adhesive flowing to the bottom to a certain height, and then the first motor operates to drive the first transmission rod mounted at the output end of the first motor to rotate; therefore, the defects that in the prior art, in actual use, the production time is increased and the transfer process is tedious due to the fact that the label with the bottom paper coated with glue needs to be wound and transferred to the next step are overcome.
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Description

Technical Field

[0001] The utility model relates to the technical field of self-adhesive labels, in particular to a self-adhesive label device. Background Art

[0002] When the existing glue coating and film laminating equipment is actually used, it is necessary to plan the paths of the two steps of glue coating and film laminating according to the steps of glue coating and film laminating the label paper. When applying glue, it is necessary to apply glue to the label paper on the roller that needs to pass through the glue coating. After the glue coating is completed, the glue-coated label paper is bonded to the base paper. Subsequently, the bonded material needs to be repeatedly pulled by the guide shaft. The pulled material is taken off from the take-up shaft and placed on the film laminating machine. After placement, the material is pulled to the guide shaft of the film laminating machine. After pulling, the material is bonded to the film laminating material and placed between the pressure rollers for pressure bonding. After the bonding is completed, the material is taken up. Since the existing technology needs to use two machines to perform separate operations when dealing with self-adhesive and film laminating steps, and after the operation is completed, the material needs to be transferred to the machine of the next step for subsequent film laminating operation, when the self-adhesive used in the glue coating and film laminating steps of the existing technology is of the same type of glue, it has the defects of increasing the operation steps and lengthening the production time. Content of the Utility Model

[0003] The utility model provides a self-adhesive label device, which has the advantage of integrated glue coating and film laminating, so as to solve the problem that after the existing technology is operated, the material needs to be transferred to the machine of the next step, resulting in the defects of increasing the operation steps and lengthening the production time when the self-adhesive used in the glue coating and film laminating steps of the existing technology is of the same type of glue.

[0004] To achieve the purpose of self-adhesive labels, the utility model provides the following technical scheme: a self-adhesive label device, including a support frame, the top surface of the support frame is provided with a bottom glue coating box, the top surface of the bottom glue coating box is provided with a first glue table, the top surface of the first glue table is provided with a glue blocking plate, a first installation hole is opened on one side surface of the bottom glue coating box, the inner wall of the first installation hole is provided with a first transmission rod, one end of the first transmission rod is provided with a first motor, the outer surface of the first transmission rod is provided with a glue coating shaft, the inner wall of the bottom glue coating box is provided with a glue removing plate, a second installation hole is opened on one side surface of the bottom glue coating box, the inner wall of the second installation hole is provided with a glue inlet pipe, the top surface of the bottom glue coating box is provided with a top glue coating box, the inner wall of the top glue coating box is provided with a glue coating component, and the top surface of the support frame is provided with a peripheral component.

[0005] As a preferred technical solution of the present utility model, there are two first mounting holes, and the two first mounting holes are equidistantly formed on one side surface and the other side surface of the bottom glue application box. The inner walls of the two first mounting holes are rotatably connected to the outer surface of a first transmission rod. One end of the first transmission rod is fixedly connected to the output end of a first motor, and one side surface of the first motor is fixedly connected to one side surface of the bottom glue application box.

[0006] As a preferred technical solution of the present utility model, there are two second mounting holes, and the two second mounting holes are equidistantly formed on one side surface and the other side surface of the bottom glue application box. A glue inlet pipe is fixedly installed on the inner wall of each second mounting hole.

[0007] As a preferred technical solution of the present utility model, the glue application assembly includes a second glue table, and the second glue table is installed on the inner wall of the top glue application box. A third mounting hole is formed on one side surface of the top glue application box, and a second transmission rod is installed on the inner wall of the third mounting hole. A second motor is installed at one end of the second transmission rod, and a glue application roller is installed on the outer surface of the second transmission rod. A fourth mounting hole is formed on one side surface of the top glue application box, a fifth mounting hole is formed on one side surface of the top glue application box, and a drip glue pipe is installed on the inner wall of the fifth mounting hole.

[0008] As a preferred technical solution of the present utility model, there are two third mounting holes, and the two third mounting holes are formed on one side surface and the other side surface of the top glue application box. The inner walls of the two third mounting holes are rotatably connected to the outer surface of a second transmission rod. The outer surface of the second transmission rod is fixedly connected to the inner wall of the glue application roller. One end of the second transmission rod is fixedly connected to the output end of the second motor, and one side surface of the second motor is fixedly connected to one side surface of the top glue application box. The fourth mounting holes are two and are equidistantly formed on one side surface and the other side surface of the top glue application box. The inner walls of the fourth mounting holes are fixedly connected to the outer surface of the glue inlet pipe. The fifth mounting holes are two and are symmetrically formed on one side surface and the other side surface of the top glue application box. The inner walls of the two fifth mounting holes are fixedly connected to the outer surface of a drip glue pipe.

[0009] As a preferred technical solution of the present utility model, the peripheral components include a mounting plate, the mounting plate is installed on the top surface of the support frame, a label shaft is installed on one side surface of the mounting plate, a guide shaft is installed on one side surface of the mounting plate, a base paper shaft is installed on one side surface of the mounting plate, a film laminating shaft is installed on one side surface of the mounting plate, a third transmission rod is installed on the inner wall of the mounting plate, a pressure roller is installed on the outer surface of the third transmission rod, an extension plate is installed on the outer surface of the third transmission rod, a stepping motor is installed at one end of the third transmission rod, a UV lamp platform is installed on one side surface of the mounting plate, and a material receiving shaft is installed on the inner wall of the mounting plate.

[0010] As a preferred technical solution of the present utility model, there are several guide shafts, one ends of the several guide shafts are fixedly connected to one side surface of the mounting plate, there are two third transmission rods, the outer surfaces of the two third transmission rods are rotatably connected to the inner wall of the mounting plate, the outer surface of each third transmission rod is rotatably connected to the inner wall of the extension plate, one end of each third transmission rod is fixedly connected to the output end of a stepping motor, and a pressure roller is fixedly installed on the outer surface of each third transmission rod.

[0011] Compared with the prior art, the present utility model provides a self-adhesive label device, which has the following beneficial effects:

[0012] In this self-adhesive label device, when the glue reaches the pipe orifice of the feed pipe through the low part of the second glue table, the glue will flow along the inner wall of the feed pipe to the inclined surface of the first glue table, and then flow along the inclined surface of the first glue table to the low part of the first glue table. Subsequently, the glue contacts the inner wall of the glue blocking plate. Because the glue blocking plate itself has a certain height, the glue will converge between the inner wall of the glue blocking plate and the inclined surface of the first glue table. Then, the first motor operates to drive the glue coating shaft to rotate through the glue coating shaft fixedly connected to its output end. The outer surface of the rotating glue coating shaft contacts the converged glue, and the attached glue is evenly coated on the bottom surface of the label paper passing through the bottom glue coating box and the label paper, thus making up for the defects in the prior art that in actual use, it is necessary to wind up and transfer the label with the base paper already coated and adhered to the next step, resulting in an increase in production time and a more cumbersome transfer process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the external structure of the present utility model;

[0014] Figure 2 It is a schematic diagram of the external structure of the present utility model from another angle;

[0015] Figure 3 It is a schematic diagram of the internal structure of the present utility model;

[0016] Figure 4This is a schematic diagram of the internal structure of another angle of the present utility model.

[0017] Figure 5 This is a schematic diagram of the internal structure of glue application of the present utility model.

[0018] In the figure: 1, support frame; 2, bottom surface glue application box; 201, first glue table; 202, glue baffle; 203, first mounting hole; 204, first transmission rod; 205, first motor; 206, glue application shaft; 207, glue removal plate; 208, glue inlet pipe; 209, second mounting hole; 3, top surface glue application box; 301, third mounting hole; 302, fourth mounting hole; 303, second motor; 304, second transmission rod; 305, glue application roller; 306, second glue table; 307, fifth mounting hole; 308, glue dropping pipe; 4, mounting plate; 5, label shaft; 6, guide shaft; 7, base paper shaft; 8, film laminating shaft; 9, stepping motor; 10, third transmission rod; 11, pressing roller; 12, UV lamp table; 13, extension plate; 14, material receiving shaft. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Embodiment 1

[0020] Please refer to Figures 1 - 3 , the present utility model discloses a self-adhesive label device, including a support frame 1, a bottom surface glue application box 2 is installed on the top surface of the support frame 1, a first glue table 201 is installed on the top surface of the bottom surface glue application box 2, a glue baffle 202 is installed on the top surface of the first glue table 201, a first mounting hole 203 is opened on one side surface of the bottom surface glue application box 2, a first transmission rod 204 is installed on the inner wall of the first mounting hole 203, a first motor 205 is installed at one end of the first transmission rod 204, a glue application shaft 206 is installed on the outer surface of the first transmission rod 204, a glue removal plate 207 is installed on the inner wall of the bottom surface glue application box 2, a second mounting hole 209 is opened on one side surface of the bottom surface glue application box 2, a glue inlet pipe 208 is installed on the inner wall of the second mounting hole 209, a top surface glue application box 3 is installed on the top surface of the bottom surface glue application box 2, a glue application component is installed on the inner wall of the top surface glue application box 3, and a peripheral component is installed on the top surface of the support frame 1.

[0021] There are two first mounting holes 203, and the two first mounting holes 203 are equidistantly arranged on one side surface and the other side surface of the bottom glue - applying box 2. The inner walls of the two first mounting holes 203 are rotatably connected to the outer surface of a first transmission rod 204 in an active manner. One end of the first transmission rod 204 is fixedly connected to the output end of a first motor 205, and one side surface of the first motor 205 is fixedly connected to one side surface of the bottom glue - applying box 2.

[0022] There are two second mounting holes 209, and the two second mounting holes 209 are equidistantly arranged on one side surface and the other side surface of the bottom glue - applying box 2. A glue inlet pipe 208 is fixedly installed on the inner wall of each second mounting hole 209.

[0023] The laminating material and the base paper are installed on the outer surfaces of the laminating shaft 8 and the base paper shaft 7. At this time, the self - adhesive glue flows along the inner wall of the glue - dropping pipe 308 and into the holes equidistantly arranged on the outer surface of the glue - dropping pipe 308, and then evenly flows to the top low - lying part of the second glue - applying table 306 along the outer surface and the slope of the second glue - applying table 306.

[0024] The label paper is pulled out from the outer surface of the label shaft 5, then passes through the bottom end of the first guide shaft 6 located below the label shaft 5, and then passes through the top surface of the second guide shaft 6, and then passes through the bottom surface of the third guide shaft 6. After that, the label paper passes through the space between the 3 and the bottom glue - applying box 2 and is pulled out to the space between the guide shafts 6. At this time, the base paper and the laminating material installed on the outer surfaces of the base paper shaft 7 and the laminating shaft 8 are pulled to the bottom surface and the top surface of the guide shaft 6 arranged on the right side of the base paper shaft 7 and the laminating shaft 8. The base paper and the laminating material are pulled to the space between a group of guide shafts 6 in active contact. At this time, the top surface of the label paper is attached to the base paper, and the bottom surface of the label paper is attached to the laminating material. Embodiment 2

[0025] Based on the above - mentioned Embodiment 1, please refer to Figures 4 - 5 , the glue - applying assembly includes a second glue - applying table 306. The second glue - applying table 306 is installed on the inner wall of the top glue - applying box 3. A third mounting hole 301 is opened on one side surface of the top glue - applying box 3. A second transmission rod 304 is installed on the inner wall of the third mounting hole 301. A second motor 303 is installed at one end of the second transmission rod 304. A glue - applying roller 305 is installed on the outer surface of the second transmission rod 304. A fourth mounting hole 302 is opened on one side surface of the top glue - applying box 3. A fifth mounting hole 307 is opened on one side surface of the top glue - applying box 3. A glue - dropping pipe 308 is installed on the inner wall of the fifth mounting hole 307.

[0026] There are two third mounting holes 301, which are opened on one side surface and the other side surface of the top glue application box 3. The inner walls of the two third mounting holes 301 are rotatably connected to the outer surface of a second transmission rod 304. The outer surface of the second transmission rod 304 is fixedly connected to the inner wall of the glue application roller 305. One end of the second transmission rod 304 is fixedly connected to the output end of the second motor 303. One side surface of the second motor 303 is fixedly connected to one side surface of the top glue application box 3. There are two fourth mounting holes 302, which are equidistantly opened on one side surface and the other side surface of the top glue application box 3. The inner walls of the fourth mounting holes 302 are fixedly connected to the outer surface of the glue inlet pipe 208. There are two fifth mounting holes 307, which are symmetrically opened on one side surface and the other side surface of the top glue application box 3. The inner walls of the two fifth mounting holes 307 are fixedly connected to the outer surface of a glue dropping pipe 308.

[0027] The peripheral components include a mounting plate 4, which is mounted on the top surface of the support frame 1. A label shaft 5 is mounted on one side surface of the mounting plate 4. A guide shaft 6 is mounted on one side surface of the mounting plate 4. A base paper shaft 7 is mounted on one side surface of the mounting plate 4. A film laminating shaft 8 is mounted on one side surface of the mounting plate 4. A third transmission rod 10 is mounted inside the mounting plate 4. A pressure roller 11 is mounted on the outer surface of the third transmission rod 10. An extension plate 13 is mounted on the outer surface of the third transmission rod 10. A stepping motor 9 is mounted at one end of the third transmission rod 10. A UV lamp stand 12 is mounted on one side surface of the mounting plate 4. A material collecting shaft 14 is mounted inside the mounting plate 4.

[0028] There are several guide shafts 6, and one end of each of the several guide shafts 6 is fixedly connected to one side surface of the mounting plate 4. There are two third transmission rods 10, and the outer surfaces of the two third transmission rods 10 are rotatably connected to the inner wall of the mounting plate 4. The outer surface of each third transmission rod 10 is rotatably connected to the inner wall of the extension plate 13. One end of each third transmission rod 10 is fixedly connected to the output end of a stepping motor 9. A pressure roller 11 is fixedly mounted on the outer surface of each third transmission rod 10.

[0029] When the glue converges at the low position of the second glue table 306 and reaches the pipe orifice of the glue inlet pipe 208, the glue will flow along the inner wall of the glue inlet pipe 208 to the inclined surface of the first glue table 201, and then flow along the inclined surface of the first glue table 201 to the low position of the first glue table 201. Subsequently, the glue contacts the inner wall of the glue baffle 202. Because the glue baffle 202 itself has a certain height, the glue will converge between the inner wall of the glue baffle 202 and the inclined surface of the first glue table 201. Then, the first motor 205 operates to drive the glue application shaft 206 to rotate through the glue application shaft 206 fixedly connected to its output end. The outer surface of the rotating glue application shaft 206 contacts the converged glue, and the attached glue is evenly applied to the bottom surface of the label paper passing through between the bottom glue application box 2 and 3.

[0030] The working principle and usage process of the present utility model: Before the integrated rubber coating, the label paper is installed on the outer surface of the label shaft 5. Subsequently, the film laminating material and the backing paper are respectively installed on the outer surfaces of the film laminating shaft 8 and the backing paper shaft 7. At this time, the self-adhesive glue flows along the inner wall of the glue dripping tube 308 and flows into the holes evenly arranged on the outer surface of the glue dripping tube 308 and uniformly flows to the top low part of the second glue table 306 along the slope of the second glue table 306.

[0031] The label paper is pulled out from the outer surface of the label shaft 5, then passes through the bottom end of the first guiding shaft 6 below the label shaft 5 and then passes through the top surface of the second guiding shaft 6, and then passes through the bottom surface of the third guiding shaft 6. Then the label paper passes through the space between 3 and the bottom glue coating box 2 and is pulled out between the guiding shafts 6. At this time, the backing paper and the film laminating material installed on the outer surfaces of the backing paper shaft 7 and the film laminating shaft 8 are pulled to the bottom surface and the top surface of the guiding shaft 6 arranged on the right side of the backing paper shaft 7 and the film laminating shaft 8. The backing paper and the film laminating material are pulled between a group of guiding shafts 6 in active contact. At this time, the top surface of the label paper is attached with the backing paper, and the bottom surface of the label paper is attached with the film laminating material. Because when the label paper passes through between the bottom glue coating box 2 and 3, the glue flowing evenly on the top surface of 3 will contact the outer surface of the glue coating roller 305 rotatably connected to the bottom surface of the second glue table 306.

[0032] Subsequently, because the glue coating roller 305 is driven to rotate indirectly by the operation of the second motor 303 through the second transmission rod 304, the self-adhesive attached to the outer surface of the glue coating roller 305 will be evenly applied to the top surface of the label paper passing through between 3 and the bottom glue coating box 2 by the rotation of the glue coating roller 305.

[0033] When the glue converges at the nozzle of the feed pipe 208 at the low part of the second glue table 306, the glue will flow along the inner wall of the feed pipe 208 to the inclined surface of the first glue table 201 and flow to the low part of the first glue table 201 along the inclined surface of the first glue table 201. Subsequently, the glue contacts the inner wall of the glue blocking plate 202. Because the glue blocking plate 202 itself has a height, the glue will converge between the inner wall of the glue blocking plate 202 and the inclined surface of the first glue table 201. Then the first motor 205 operates to drive the glue coating shaft 206 to rotate through the glue coating shaft 206 fixedly connected to its output end. The outer surface of the rotating glue coating shaft 206 contacts the converged glue and evenly applies the attached glue to the bottom surface of the label paper passing through between the bottom glue coating box 2 and 3.

[0034] When the label paper with glue evenly applied on the bottom and top surfaces passes between two symmetrically contacting guide shafts 6, it adheres to the backing paper and the laminating material. At this time, the laminating material adheres to the label paper through the glue on the bottom surface of the label paper, and the backing paper adheres to the label paper through the glue evenly applied on the top surface of the label paper. Subsequently, the three are initially adhered and rolled between the guide shafts 6, then pass between the UV lamp stands 12, and are guided through between the pressure rollers 11 after passing between the UV lamp stands 12. The three passing between the pressure rollers 11 are guided between the bottom and top surfaces of four guide shafts 6 provided on the right side of the pressure rollers 11. Subsequently, the adhered three are installed on the outer surface of the winding shaft 14 for winding. At this time, the operation of the self-adhesive label is completed.

Claims

1. An adhesive label device, comprising a support frame (1), and a bottom surface glue coating box (2) is installed on the top surface of the support frame (1), characterized in that: A first glue platform (201) is installed on the top surface of the bottom glue application box (2). A glue blocking plate (202) is installed on the top surface of the first glue platform (201). A first installation hole (203) is formed on one side surface of the bottom glue application box (2). A first transmission rod (204) is installed on the inner wall of the first installation hole (203). A first motor (205) is installed at one end of the first transmission rod (204). A glue application shaft (206) is installed on the outer surface of the first transmission rod (204). A glue removing plate (207) is installed on the inner wall of the bottom glue application box (2). A second installation hole (209) is formed on one side surface of the bottom glue application box (2). A glue inlet pipe (208) is installed on the inner wall of the second installation hole (209). A top glue application box (3) is installed on the top surface of the bottom glue application box (2). A glue application assembly is installed on the inner wall of the top glue application box (3). An outer peripheral assembly is installed on the top surface of the support frame (1).

2. The self-adhesive label device according to claim 1, characterized in that: There are two first installation holes (203). The two first installation holes (203) are equidistantly formed on one side surface and the other side surface of the bottom glue application box (2). The inner walls of the two first installation holes (203) are rotatably connected to the outer surface of a first transmission rod (204). One end of the first transmission rod (204) is fixedly connected to the output end of the first motor (205). One side surface of the first motor (205) is fixedly connected to one side surface of the bottom glue application box (2).

3. The self-adhesive label device according to claim 1, characterized in that: There are two second installation holes (209). The two second installation holes (209) are equidistantly formed on one side surface and the other side surface of the bottom glue application box (2). A glue inlet pipe (208) is fixedly installed on the inner wall of each second installation hole (209).

4. The self-adhesive label device according to claim 1, characterized in that: The glue application assembly includes a second glue platform (306). The second glue platform (306) is installed on the inner wall of the top glue application box (3). A third installation hole (301) is formed on one side surface of the top glue application box (3). A second transmission rod (304) is installed on the inner wall of the third installation hole (301). A second motor (303) is installed at one end of the second transmission rod (304). A glue application roller (305) is installed on the outer surface of the second transmission rod (304). A fourth installation hole (302) is formed on one side surface of the top glue application box (3). A fifth installation hole (307) is formed on one side surface of the top glue application box (3). A glue dropping pipe (308) is installed on the inner wall of the fifth installation hole (307).

5. The self-adhesive label device according to claim 4, characterized in that: The third mounting holes (301) are two, and the two third mounting holes (301) are formed in one side surface and the other side surface of the top surface glue application box (3). The inner walls of the two third mounting holes (301) are rotatably connected to the outer surface of a second transmission rod (304). The outer surface of the second transmission rod (304) is fixedly connected to the inner wall of the glue application roller (305). One end of the second transmission rod (304) is fixedly connected to the output end of the second motor (303). One side surface of the second motor (303) is fixedly connected to one side surface of the top surface glue application box (3). The fourth mounting holes (302) are two and are equidistantly formed in one side surface and the other side surface of the top surface glue application box (3). The inner walls of the fourth mounting holes (302) are fixedly connected to the outer surface of the glue inlet pipe (208). The fifth mounting holes (307) are two and are symmetrically formed in one side surface and the other side surface of the top surface glue application box (3). The inner walls of the two fifth mounting holes (307) are fixedly connected to the outer surface of a glue dropping pipe (308).

6. The self-adhesive label device according to claim 1, characterized in that: The peripheral components include a mounting plate (4). The mounting plate (4) is mounted on the top surface of the support frame (1). A label shaft (5) is mounted on one side surface of the mounting plate (4). A guide shaft (6) is mounted on one side surface of the mounting plate (4). A base paper shaft (7) is mounted on one side surface of the mounting plate (4). A film covering shaft (8) is mounted on one side surface of the mounting plate (4). A third transmission rod (10) is mounted inside the mounting plate (4). A pressure roller (11) is mounted on the outer surface of the third transmission rod (10). An extension plate (13) is mounted on the outer surface of the third transmission rod (10). A stepping motor (9) is mounted at one end of the third transmission rod (10). A UV lamp stand (12) is mounted on one side surface of the mounting plate (4). A material collecting shaft (14) is mounted inside the mounting plate (4).

7. The self-adhesive label device according to claim 6, characterized in that: There are several guide shafts (6), and one ends of the several guide shafts (6) are fixedly connected to one side surface of the mounting plate (4). There are two third transmission rods (10), and the outer surfaces of the two third transmission rods (10) are rotatably connected to the inner wall of the mounting plate (4). The outer surface of each third transmission rod (10) is rotatably connected to the inner wall of the extension plate (13). One end of each third transmission rod (10) is fixedly connected to the output end of a stepping motor (9). A pressure roller (11) is fixedly mounted on the outer surface of each third transmission rod (10).