Thread binding type binding machine capable of reducing paper pressing mechanism

Abstract

The thread binding type binding machine comprises a binding platform, an upper frame, a lower frame, a drilling mechanism, a threading mechanism and the paper pressing mechanism, the upper frame is fixedly installed on the upper portion of the binding platform, the lower frame is fixedly installed on the lower portion of the binding platform, the drilling mechanism and the paper pressing mechanism are respectively installed on the upper frame, the threading mechanism is installed on the lower frame, and the paper pressing mechanism is installed on the lower frame. The paper pressing mechanism comprises a paper pressing plate, a paper pressing driving assembly, at least two linear bearings and at least two paper pressing guide rods, the two paper pressing guide rods are vertically and fixedly installed on the upper frame, the two paper pressing guide rods are arranged at intervals in the transverse direction and do not protrude out of the left side and the right side of the drilling mechanism, and the two linear bearings are slidably installed on the two paper pressing guide rods correspondingly; the paper pressing plate is fixedly installed on the two linear bearings, and the paper pressing driving assembly is fixedly installed on the upper frame and is in transmission connection with the paper pressing plate. The size and weight of the paper pressing mechanism are reduced, the cost is reduced, the overall width of the thread binding type binding machine is reduced, and the paper pressing strength is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of binding machines, in particular to a thread-bound binding machine with a reduced paper pressing mechanism. Background Art

[0002] A thread-bound binding machine is an office appliance that uses string to bind and preserve books, files, and documents. It includes a drilling mechanism, a threading mechanism, and a paper pressing mechanism. The drilling mechanism drills holes in the binding material, the threading mechanism threads the binding material, and the paper pressing mechanism presses and secures the binding material during drilling and threading. A traditional paper pressing mechanism includes a paper pressing plate, two springs, and two paper pressing guides. The two paper pressing guides are slidably mounted on either side of the drilling mechanism, and two springs are respectively sleeved on the paper pressing guides. When the drilling mechanism moves downward, the springs push the paper pressing plate downward to press against the binding material. The paper pressing guides slide relative to the drilling mechanism. When the drilling mechanism moves upward to reset, the drilling mechanism drives the paper pressing guides upward, thereby driving the paper pressing plate upward to release the pressure. Since the two paper pressing guide rods are located on both sides of the drilling mechanism, they need to occupy lateral installation space, which results in a larger width and volume of the thread-bound binding machine. At the same time, the lateral length of the paper pressing board is longer, especially for thread-bound binding machines with three holes or more. In order to prevent the paper pressing board from bending, the paper pressing board needs to have a certain thickness to improve the structural strength, which results in a heavy weight and high cost of the paper pressing board. In addition, the traditional paper pressing mechanism has no independent driving mechanism, and cannot ensure a constant paper pressing pressure when drilling or threading, resulting in poor paper pressing effect. Therefore, it is necessary to improve it. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a thread-bound binding machine with a smaller paper pressing mechanism, reduce the volume and weight of the paper pressing mechanism, reduce costs, reduce the overall width of the thread-bound binding machine, and improve the paper pressing force.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a thread-binding machine with a reduced paper pressing mechanism, comprising a binding platform, an upper frame, a lower frame, a drilling mechanism, a threading mechanism and a paper pressing mechanism, the upper frame is fixedly installed on the upper part of the binding platform, the lower frame is fixedly installed on the lower part of the binding platform, the drilling mechanism and the paper pressing mechanism are respectively installed on the upper frame, the threading mechanism is installed on the lower frame, the paper pressing mechanism comprises a paper pressing board, a paper pressing drive assembly, at least two linear bearings and at least two paper pressing guide rods, the two paper pressing guide rods are vertically fixedly installed on the upper frame, the two paper pressing guide rods are spaced apart in the transverse direction and do not protrude from the left and right sides of the drilling mechanism, the two linear bearings are respectively slidably installed on the two paper pressing guide rods, the paper pressing board is fixedly installed on the two linear bearings, and the paper pressing drive assembly is fixedly installed on the upper frame and is transmission-connected to the paper pressing board.

[0005] In a further technical solution, the paper pressing drive assembly includes a paper pressing reduction motor, a paper pressing drive gear and a paper pressing drive rack. A motor fixing seat is provided on the upper frame, the paper pressing reduction motor is fixedly installed on the motor fixing seat, the paper pressing drive gear is coaxially fixedly installed on the output shaft of the paper pressing reduction motor, the paper pressing drive rack is fixedly installed on the rear part of the paper pressing paper board, and the paper pressing drive gear is engaged with the paper pressing drive rack.

[0006] In a further technical solution, the paper pressing drive rack includes a limiting portion and an engaging portion. The limiting portion is formed at the upper end portion of the engaging portion. A plurality of teeth are arranged on one side of the engaging portion in the vertical direction. The engaging portion is engaged with the paper pressing drive gear. A fixing plate is provided at the lower end portion of the engaging portion. The fixing plate is fixedly connected to the paper pressing paper by screws. A top plate is provided on the upper part of the upper frame. A slide groove is provided on the top plate at the position of the paper pressing drive rack, and the limiting portion is slidably installed in the slide groove.

[0007] In a further technical solution, a wear-resistant sleeve made of plastic or rubber is embedded in the slide groove.

[0008] In a further technical solution, a limit switch is provided on the upper portion of the motor fixing seat, and a trigger step is provided between the limit portion and the engaging portion, and the trigger step cooperates with the limit switch for triggering.

[0009] In a further technical solution, the thread-bound binding machine is further provided with a control device, which is fixedly mounted on the upper frame. The control device is provided with a control circuit, which is electrically connected to the limit switch and the paper pressing reduction motor respectively.

[0010] In a further technical solution, the paper pressing plate includes a sliding horizontal plate, a connecting vertical plate and at least one paper pressing horizontal plate. The front end face of the sliding horizontal plate is integrally formed with the upper end face of the connecting vertical plate, and the rear end face of the paper pressing horizontal plate is integrally formed with the lower end face of the connecting vertical plate. The sliding horizontal plate is provided with at least two sliding holes, and the two sliding holes are respectively slidably matched with the two paper pressing guide rods. The two linear bearings are respectively fixed to the sliding horizontal plate and are located above the two sliding holes.

[0011] In a further technical solution, the drilling mechanism is provided with three drilling knives spaced apart along the transverse direction, and the paper pressing plate is provided with three paper pressing transverse plates, which are spaced apart along the transverse direction and located below each drilling knife. Each paper pressing transverse plate is provided with a drilling notch, and each drilling notch is aligned with each drilling knife in the vertical direction.

[0012] In a further technical solution, two avoidance gaps are provided at the lower portion of the connecting vertical plate, and the two avoidance gaps are respectively located between two adjacent paper pressing horizontal plates.

[0013] In a further technical solution, the drilling mechanism includes a drilling slide, a drilling motor, a drilling transmission assembly, a drilling lifting drive assembly and various drilling cutters. At least two drilling guide rods are vertically arranged on the upper frame. The drilling slide is slidably installed on the two drilling guide rods. The drilling lifting drive assembly is transmission-connected to the drilling slide. The drilling motor is fixedly installed on the drilling slide. Various drilling cutters are rotatably installed on the drilling slide. The drilling motor is transmission-connected to the drilling transmission assembly. The drilling transmission assembly is transmission-connected to various drilling cutters. Two through-rod holes vertically passing through the drilling slide are opened in the middle of the drilling slide, and the two paper pressing guide rods are respectively located in the two through-rod holes.

[0014] After adopting the above structure, the advantages of the present invention compared with the prior art are: the paper pressing board is driven independently by the paper pressing drive assembly, which can always keep the paper pressing force constant, improve the paper pressing effect, prevent the drilling knife and the threading needle from moving the binding material when they are raised and lowered, and improve the binding success rate; the paper pressing guide rod does not protrude from the left and right sides of the drilling mechanism, thereby shortening the lateral length of the paper pressing board, reducing the lateral volume of the thread-binding binding machine, reducing the thickness of the paper pressing board, reducing material usage, and reducing cost and weight; the paper pressing board is directly fixed on the linear bearing, with a simple structure and low cost; the paper pressing board is installed by at least two paper pressing guide rods and two linear bearings, which can prevent the paper pressing board from swinging, improve the force uniformity of the binding material, and improve the paper pressing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the back of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the paper pressing mechanism of the present utility model.

[0019] In the picture:

[0020] 1 binding platform, 11 upper shelf, 111 motor fixing seat, 112 top plate, 113 slide, 114 wear-resistant sleeve, 12 lower shelf;

[0021] 2 drilling mechanism, 21 drilling cutter, 22 drilling slide, 221 rod penetration hole, 23 drilling motor, 24 drilling lifting drive assembly, 25 drilling guide rod;

[0022] 3. Threading mechanism;

[0023] 4 press board, 41 sliding horizontal plate, 42 connecting vertical plate, 421 avoidance gap, 43 press board, 431 drilling gap;

[0024] 5 paper pressing drive assembly, 51 paper pressing reduction motor, 52 paper pressing drive gear, 53 paper pressing drive rack, 531 limiting portion, 532 meshing portion, 533 fixing plate, 534 triggering step;

[0025] 6 linear bearings;

[0026] 7Paper guide rod;

[0027] 8 limit switches. DETAILED DESCRIPTION

[0028] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0029] A thread-bound binding machine with a reduced paper pressing mechanism, such as Figures 1 to 3 As shown, it includes a binding platform 1, an upper frame 11, a lower frame 12, a drilling mechanism 2, a threading mechanism 3 and a paper pressing mechanism. The upper frame 11 is fixedly installed on the upper part of the binding platform 1, and the lower frame 12 is fixedly installed on the lower part of the binding platform 1. The drilling mechanism 2 and the paper pressing mechanism are respectively installed on the upper frame 11, and the threading mechanism 3 is installed on the lower frame 12. It is characterized in that: the paper pressing mechanism includes a paper pressing board 4, a paper pressing drive assembly 5, at least two linear bearings 6 and at least two paper pressing guide rods 7, the two paper pressing guide rods 7 are vertically fixedly installed on the upper frame 11, the two paper pressing guide rods 7 are spaced apart in the transverse direction and do not protrude from the left and right sides of the drilling mechanism 2, the two linear bearings 6 are respectively slidably installed on the two paper pressing guide rods 7, the paper pressing board 4 is fixedly installed on the two linear bearings 6, and the paper pressing drive assembly 5 is fixedly installed on the upper frame 11 and is transmission-connected to the paper pressing board 4.

[0030] The two paper pressing guide rods 7 of the pressing mechanism of the traditional thread-binding machine are slidably installed on the left and right sides of the drilling mechanism 2 and are driven by the drilling mechanism 2. Therefore, the lateral installation space will be increased, resulting in a large lateral volume of the thread-binding machine, and the lateral length of the paper pressing plate 4 is long. In order to prevent the paper pressing plate 4 from bending and ensure that the binding material is subjected to uniform force, the traditional paper pressing plate 4 is thick, heavy, and costly. However, the utility model independently drives the paper pressing plate 4 through the paper pressing drive component 5, which can always keep the paper pressing force constant, improve the paper pressing effect, and prevent drilling. The knife 21 and the threading needle drive the binding material to move when they are raised and lowered, thereby improving the success rate of binding; the paper pressing guide rod 7 does not protrude from the left and right sides of the drilling mechanism 2, thereby shortening the lateral length of the paper pressing board 4, reducing the lateral volume of the thread-binding binding machine, reducing the thickness of the paper pressing board 4, reducing material usage, and reducing cost and weight; the paper pressing board 4 is directly fixed on the linear bearing 6, with a simple structure and low cost; the paper pressing board 4 is installed by at least two paper pressing guide rods 7 and two linear bearings 6, which can prevent the paper pressing board 4 from swinging, improve the force uniformity of the binding material, and improve the paper pressing effect.

[0031] Specifically, the paper pressing drive assembly 5 includes a paper pressing reduction motor 51, a paper pressing drive gear 52, and a paper pressing drive rack 53. The upper frame 11 is provided with a motor fixing seat 111. The paper pressing reduction motor 51 is fixedly mounted on the motor fixing seat 111. The paper pressing drive gear 52 is coaxially fixedly mounted on the output shaft of the paper pressing reduction motor 51. The paper pressing drive rack 53 is fixedly mounted on the rear part of the paper pressing board 4. The paper pressing drive gear 52 is meshed with the paper pressing drive rack 53. When paper pressing, the paper pressing reduction motor 51 drives the paper pressing drive gear 52 to rotate, and the paper pressing drive gear 52 drives the paper pressing drive rack 53 to move downward, thereby causing the paper pressing board 4 to move downward to press the paper. When the paper pressing board 4 presses against the binding material, the paper pressing reduction motor 51 still keeps running, so that the paper pressing board 4 maintains a downward pressure trend, thereby ensuring the paper pressing force.

[0032] Specifically, the paper pressing drive rack 53 includes a limiting portion 531 and an engaging portion 532. The limiting portion 531 is formed at the upper end of the engaging portion 532. A plurality of teeth are provided on one side of the engaging portion 532 in the vertical direction. The engaging portion 532 is engaged with the paper pressing drive gear 52. A fixing plate 533 is provided at the lower end of the engaging portion 532. The fixing plate 533 is fixedly connected to the paper pressing paper 4 by screws. A top plate 112 is provided on the upper part of the upper frame 11. A slide groove 113 is provided on the top plate 112 at the position of the paper pressing drive rack 53. The limiting portion 531 is slidably installed in the slide groove 113. The paper pressing drive rack 53 is connected to the paper pressing paper 4 through a fixed plate 533. It has a simple structure, low cost and is easy to produce. The limiting portion 531 of the paper pressing drive rack 53 is always located in the slide groove 113, so that the slide groove 113 limits the limiting portion 531, thereby preventing the paper pressing drive rack 53 from swinging and displacing, avoiding the meshing portion 532 from separating from the paper pressing drive gear 52, and improving reliability and stability.

[0033] Specifically, a wear-resistant sleeve 114 made of plastic or rubber is embedded in the chute 113. To ensure structural strength, the upper frame 11 and the paper pressing drive rack 53 are both made of metal. Therefore, the wear-resistant sleeve 114 prevents metal friction between the stopper 531 of the paper pressing drive rack 53 and the inner wall of the chute 113, thereby reducing noise and wear.

[0034] Specifically, a limit switch 8 is provided on the upper portion of the motor mounting base 111. A trigger step 534 is provided between the limit portion 531 and the engaging portion 532. The trigger step 534 is engaged with the limit switch 8 for triggering. The width of the limit portion 531 is smaller than the width of the engaging portion 532, thereby forming the trigger step 534. The limit switch 8 is a micro switch. When the trigger step 534 contacts the trigger spring of the micro switch, the micro switch is triggered, causing the paper pressing reduction motor 51 to stop.

[0035] Specifically, the thread-binding machine is further provided with a control device, which is fixedly mounted on the upper frame 11. The control device is provided with a control circuit, which is electrically connected to the limit switch 8 and the paper pressing reduction motor 51. After completing paper pressing, the paper pressing reduction motor 51 drives the paper pressing drive gear 52 to rotate in the opposite direction, and the paper pressing drive gear 52 drives the paper pressing drive rack 53 to move upward, thereby moving the paper pressing board 4 upward and separating it from the binding material until the trigger step 534 touches the trigger spring of the limit switch 8. The limit switch 8 sends a stop signal to the control circuit, thereby stopping the paper pressing reduction motor 51.

[0036] Specifically, the paper pressing plate 4 includes a sliding horizontal plate 41, a connecting vertical plate 42, and at least one paper pressing horizontal plate 43. The front end face of the sliding horizontal plate 41 is integrally formed with the upper end face of the connecting vertical plate 42, and the rear end face of the paper pressing horizontal plate 43 is integrally formed with the lower end face of the connecting vertical plate 42. The sliding horizontal plate 41 has at least two sliding holes, which are respectively slidably engaged with two paper pressing guide rods 7. Two linear bearings 6 are respectively fixed to the sliding horizontal plate 41 and located above the two sliding holes. The paper pressing plate 4 is integrally formed by bending, which has a simple production process, low cost, and high production efficiency.

[0037] Specifically, the drilling mechanism 2 is provided with three drilling knives 21 spaced apart in the transverse direction, and the paper pressing plate 4 is provided with three paper pressing cross plates 43. The three paper pressing cross plates 43 are spaced apart in the transverse direction and are located below each drilling knives 21. Each paper pressing cross plate 43 is provided with a drilling notch 431. Each drilling notch 431 is aligned with each drilling knives 21 in the vertical direction. When drilling, the drilling notch 431 is used to avoid the drilling knives 21. The three drilling knives 21 drill holes simultaneously, improving the binding efficiency. The corresponding threading mechanism 3 is provided with three threading needles. Each threading needle is aligned with each drilling knives 21 in the vertical direction. When threading, the drilling notch 431 is used to avoid the threading needle. By providing three paper pressing cross plates 43, the contact area between the paper pressing cross plates 43 and the binding object is reduced, thereby increasing the pressure and further improving the paper pressing effect.

[0038] Specifically, two avoidance notches 421 are formed at the lower portion of the connecting vertical plate 42, and the two avoidance notches 421 are respectively located between two adjacent paper pressing horizontal plates 43. The two avoidance notches 421 can avoid protrusions on the binding material, and can reduce the material usage of the connecting vertical plate 42, reduce cost, and reduce weight.

[0039] Specifically, the drilling mechanism 2 includes a drilling slide 22, a drilling motor 23, a drilling transmission assembly, a drilling lifting drive assembly 24 and each drilling cutter 21. The upper frame 11 is vertically provided with at least two drilling guide rods 25. The drilling slide 22 is slidably installed on the two drilling guide rods 25. The drilling lifting drive assembly 24 is transmission-connected to the drilling slide 22. The drilling motor 23 is fixedly installed on the drilling slide 22. Each drilling cutter 21 is rotatably installed on the drilling slide 22. The drilling motor 23 is transmission-connected to the drilling transmission assembly. The drilling transmission assembly is transmission-connected to each drilling cutter 21. Two through-rod holes 221 vertically passing through the drilling slide 22 are provided in the middle of the drilling slide 22. The two paper pressing guide rods 7 are respectively located in the two through-rod holes 221. The left and right sides of the rear part of the drilling slide 22 are respectively slidably engaged with the two drilling guide rods 25, and each drilling knife 21 is arranged at the front part of the drilling slide 22, and the rod hole 221 is located in the middle part of the drilling slide 22. The paper pressing guide rod 7 is avoided by the rod hole 221, so that the paper pressing mechanism and the drilling mechanism 2 overlap, making the structure more compact, reducing the longitudinal space occupied, and further reducing the volume of the thread-bound binding machine.

[0040] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A thread-binding machine with a reduced paper pressing mechanism, comprising a binding platform (1), an upper frame (11), a lower frame (12), a drilling mechanism (2), a threading mechanism (3) and a paper pressing mechanism, wherein the upper frame (11) is fixedly mounted on the upper portion of the binding platform (1), the lower frame (12) is fixedly mounted on the lower portion of the binding platform (1), the drilling mechanism (2) and the paper pressing mechanism are respectively mounted on the upper frame (11), and the threading mechanism (3) is mounted on the lower frame (12), characterized in that: The paper pressing mechanism comprises a paper pressing board (4), a paper pressing drive assembly (5), at least two linear bearings (6) and at least two paper pressing guide rods (7), wherein the two paper pressing guide rods (7) are vertically fixedly mounted on an upper frame (11), the two paper pressing guide rods (7) are spaced apart in a transverse direction and do not protrude from the left and right sides of the drilling mechanism (2), the two linear bearings (6) are respectively slidably mounted on the two paper pressing guide rods (7), the paper pressing board (4) is fixedly mounted on the two linear bearings (6), and the paper pressing drive assembly (5) is fixedly mounted on the upper frame (11) and is in transmission connection with the paper pressing board (4).

2. The thread-binding machine with a reduced paper pressing mechanism according to claim 1, characterized in that: The paper pressing drive assembly (5) comprises a paper pressing reduction motor (51), a paper pressing drive gear (52) and a paper pressing drive rack (53); the upper frame (11) is provided with a motor fixing seat (111); the paper pressing reduction motor (51) is fixedly mounted on the motor fixing seat (111); the paper pressing drive gear (52) is coaxially fixedly mounted on the output shaft of the paper pressing reduction motor (51); the paper pressing drive rack (53) is fixedly mounted on the rear part of the paper pressing paper (4); and the paper pressing drive gear (52) is meshed with the paper pressing drive rack (53).

3. The thread-binding machine with a reduced paper pressing mechanism according to claim 2, characterized in that: The paper pressing drive rack (53) includes a limiting portion (531) and an engaging portion (532), the limiting portion (531) is formed at the upper end of the engaging portion (532), a plurality of teeth are provided on one side of the engaging portion (532) in the vertical direction, the engaging portion (532) is engaged with the paper pressing drive gear (52), a fixing plate (533) is provided at the lower end of the engaging portion (532), the fixing plate (533) is fixedly connected to the paper pressing paper (4) by screws, a top plate (112) is provided at the upper part of the upper frame (11), a slide groove (113) is provided on the top plate (112) at the position of the paper pressing drive rack (53), and the limiting portion (531) is slidably installed in the slide groove (113).

4. The thread-binding machine with a reduced paper pressing mechanism according to claim 3, characterized in that: A wear-resistant sleeve (114) made of plastic or rubber is embedded in the slide groove (113).

5. The thread-binding machine with a reduced paper pressing mechanism according to claim 3, characterized in that: A limit switch (8) is provided on the upper portion of the motor fixing seat (111), a trigger step (534) is provided between the limit portion (531) and the engaging portion (532), and the trigger step (534) is triggered and matched with the limit switch (8).

6. The thread-binding machine with a reduced paper pressing mechanism according to claim 5, characterized in that: The thread-binding machine is further provided with a control device, which is fixedly mounted on the upper frame (11). The control device is provided with a control circuit, which is electrically connected to the limit switch (8) and the paper pressing reduction motor (51) respectively.

7. A thread-binding machine with a reduced paper pressing mechanism according to any one of claims 2 to 6, characterized in that: The paper pressing board (4) includes a sliding transverse plate (41), a connecting vertical plate (42) and at least one paper pressing transverse plate (43). The front end face of the sliding transverse plate (41) and the upper end face of the connecting vertical plate (42) are integrally formed, and the rear end face of the paper pressing transverse plate (43) and the lower end face of the connecting vertical plate (42) are integrally formed. The sliding transverse plate (41) is provided with at least two sliding holes, and the two sliding holes are respectively slidably matched with the two paper pressing guide rods (7). The two linear bearings (6) are respectively fixed to the sliding transverse plate (41) and are located above the two sliding holes.

8. The thread-binding machine with a reduced paper pressing mechanism according to claim 7, characterized in that: The drilling mechanism (2) is provided with three drilling knives (21) spaced apart in the transverse direction, and the paper pressing board (4) is provided with three paper pressing transverse plates (43), the three paper pressing transverse plates (43) are spaced apart in the transverse direction and are located below each drilling knife (21), each paper pressing transverse plate (43) is provided with a drilling notch (431), and each drilling notch (431) is aligned with each drilling knife (21) in the vertical direction.

9. The thread-binding machine with a reduced paper pressing mechanism according to claim 8, characterized in that: Two avoidance gaps (421) are provided at the lower portion of the connecting vertical plate (42), and the two avoidance gaps (421) are respectively located between two adjacent paper pressing horizontal plates (43).

10. The thread-binding machine with a reduced paper pressing mechanism according to claim 9, characterized in that: The drilling mechanism (2) comprises a drilling slide (22), a drilling motor (23), a drilling transmission assembly, a drilling lifting drive assembly (24) and each of the drilling knives (21); the upper frame (11) is vertically provided with at least two drilling guide rods (25); the drilling slide (22) is slidably mounted on the two drilling guide rods (25); the drilling lifting drive assembly (24) is transmission-connected to the drilling slide (22); the drilling motor (23) is fixedly mounted on the drilling slide (22); each of the drilling knives (21) is rotationally mounted on the drilling slide (22); the drilling motor (23) is transmission-connected to the drilling transmission assembly; the drilling transmission assembly is transmission-connected to each of the drilling knives (21); two rod holes (221) vertically penetrating the drilling slide (22) are provided in the middle of the drilling slide (22); the two paper pressing guide rods (7) are respectively located in the two rod holes (221).

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