An apparatus for book packaging

By combining the electrostatic dust removal of carbon fiber brushes and the negative pressure fan, along with the self-cleaning mechanism of scraper and roller brushes, the problem of dust and impurities adsorbed during the book packaging process of the roll film is solved, realizing a highly efficient and automated book packaging equipment.

CN224529213UActive Publication Date: 2026-07-21ANHUI ZHONGWAN BAILANG PRINTING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ANHUI ZHONGWAN BAILANG PRINTING CO LTD
Filing Date
2025-09-04
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In existing technologies, roll film easily attracts dust and impurities during the book packaging process. In particular, the static electricity effect is amplified when the film is running at high speed, resulting in poor cleaning effect and affecting the quality of book packaging.

Method used

The dust removal mechanism uses carbon fiber brushes in conjunction with an electrostatic generator and a negative pressure fan. Through the combined action of electrostatic adsorption and negative pressure fan, dust and impurities on the membrane surface are removed. Combined with the self-cleaning mechanism of scraper and roller brush, the equipment can be kept running continuously.

Benefits of technology

It significantly improves cleaning efficiency, reduces manual intervention, avoids stains and bubbles on the packaging film surface, extends equipment operation cycle, and improves the automation level and finished product quality of book packaging.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to book packaging technical field, concretely for a kind of equipment for book packaging, including fixed frame and two groups of sliding installation in the mounting bracket of fixed frame, two-way screw rod is rotatably installed on the fixed frame, two ends of two-way screw rod are respectively penetrated two groups of mounting bracket and respectively with two groups of mounting bracket screw connection, carbon fiber brush is rotatably installed on two groups of mounting bracket, electrically conductive slip ring is installed on mounting bracket, fixed frame side is equipped with electrostatic generator, and dust removal mechanism is equipped on fixed frame;Dust removal mechanism includes the dust absorption box being set to the side of fixed frame, two groups of mounting bracket are synchronously moved towards or reverse by two-way screw rod drive, the book packaging film of different thickness is adapted, cooperate the electrostatic dust removal design of carbon fiber brush, effectively remove dust and impurity adsorbed on film surface, and the high voltage electricity of electrostatic generator is ensured to be continuously and stably transmitted to the carbon fiber brush of rotation by electrically conductive slip ring, and electrostatic adsorption effect is enhanced.
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Description

Technical Field

[0001] This utility model relates to the field of book packaging technology, specifically to a device for book packaging. Background Technology

[0002] In the book packaging industry, roll film materials (such as PE film, PP composite film, and environmentally friendly film) have become an important component of modern book packaging technology due to their excellent sealing properties, tear resistance, and transparency. They are widely used in book lamination, shrink wrapping, and skin packaging. These films not only effectively protect books from moisture, dirt, and wear and tear during transportation, but also enhance the visual appeal and commercial value of books through matte, glossy, or special texture treatments. With the publishing industry's increasing demands for packaging efficiency and increasingly stringent environmental regulations, automated packaging equipment is gradually replacing traditional manual packaging. The cleanliness of the roll film directly affects the heat sealing effect, printing clarity, and yield rate.

[0003] In existing technologies, roll film easily attracts impurities such as dust, paper scraps, and adhesive residue during continuous conveying and packaging operations. Especially when operating at high speed, static electricity can further aggravate the adhesion of pollutants. Traditional solutions often rely on manual periodic shutdowns for cleaning or the use of simple brushes, which is not only inefficient but also difficult to guarantee the cleaning effect. This results in defects such as stains and bubbles on the surface of the packaged books, affecting product quality and potentially leading to customer complaints. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the shortcomings of the prior art, this utility model provides a device for book packaging, which solves the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a device for book packaging, comprising a fixed frame and two sets of mounting frames slidably mounted on the fixed frame, wherein a bidirectional lead screw is rotatably mounted on the fixed frame, the two ends of the bidirectional lead screw respectively pass through the two sets of mounting frames and are threadedly connected to the two sets of mounting frames respectively, carbon fiber brushes are rotatably mounted on both sets of mounting frames, conductive slip rings are mounted on the mounting frames, an electrostatic generator is provided on one side of the fixed frame, and a dust removal mechanism is provided on the fixed frame;

[0008] The dust removal mechanism includes a dust collection box located on one side of the fixed frame, and a dust collection port fixedly installed on the mounting frame and attached to the carbon fiber brush. The dust collection port is fixedly connected to the dust collection box via a connecting pipe. A negative pressure fan is embedded in the dust collection box. A filter frame is installed inside the dust collection box. The filter frame is located between the connection between the connecting pipe and the dust collection box and the negative pressure fan. The rotation direction of the carbon fiber brushes on the two sets of mounting frames is opposite to the conveying direction of the book packaging film. Scrapers are slidably installed on both sets of mounting frames, and the scrapers are attached to the carbon fiber brush. A cleaning mechanism for cleaning the filter frame is provided inside the dust collection box.

[0009] Preferably, the rotor end of the conductive slip ring body is fixed to the end of the carbon fiber brush rotating shaft by a heat-shrinking process, the stator end of the conductive slip ring is fixedly installed on the mounting bracket by an insulating flange, the high voltage output end of the electrostatic generator is connected to the input contact of the stator end of the conductive slip ring by a shielded cable, and the output contact of the rotor end of the conductive slip ring is connected to the carbon fiber brush.

[0010] Preferably, a first sliding rod is fixedly installed inside the mounting frame, the scraper is slidably sleeved with the first sliding rod, two sets of symmetrically distributed first springs are sleeved on the first sliding rod, the two ends of the two sets of first springs are fixedly connected to the scraper and the mounting frame respectively, and a first cam is rotatably installed on the mounting frame, and the first cam is fitted with the scraper.

[0011] Preferably, the cleaning mechanism includes a movable frame slidably installed inside a dust collection box, and a screw is rotatably installed inside the dust collection box. The screw passes through the movable frame and is threadedly connected to the movable frame. A roller brush is rotatably installed on the movable frame and is fitted to the surface of the filter frame. A scraper is rotatably installed on the movable frame and is fitted to the roller brush. A movable block is slidably installed inside the movable frame. A threaded rod is rotatably installed inside the movable frame and passes through the movable block and is threadedly connected to the movable block.

[0012] Preferably, a gear is sleeved on the scraper, a rack is slidably installed in the movable frame and meshes with the gear, and a cylinder is fixedly installed in the movable frame, with the rack fixedly connected to the output end of the cylinder piston rod.

[0013] Preferably, a scraper block is slidably installed inside the movable block, and the scraper block is slidably sleeved with one side of the scraper. A second slide rod is fixedly installed inside the movable block, and the scraper block is slidably sleeved with the second slide rod. A second cam is rotatably installed inside the movable block, and the second cam is fitted with the scraper block.

[0014] Preferably, two sets of symmetrically distributed second springs are sleeved on the second slide rod, and the two ends of the two sets of second springs are fixedly connected to the scraper block and the moving block, respectively.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a device for book packaging, which has the following beneficial effects:

[0017] Two sets of mounting brackets move synchronously in opposite directions via a bidirectional lead screw, adapting to book packaging films of different thicknesses. Combined with an electrostatic dust removal design using carbon fiber brushes, it effectively removes dust and impurities adsorbed on the film surface. A conductive slip ring ensures a continuous and stable transmission of high-voltage electricity from the electrostatic generator to the rotating carbon fiber brushes, enhancing the electrostatic adsorption effect. The scraper brush, through the cooperation of a first cam and a first spring, performs reciprocating scraping, preventing contaminant accumulation on the brush surface. In the dust removal mechanism, a negative pressure fan and a suction port work together to directly collect the stripped contaminants, significantly improving cleaning efficiency, reducing manual intervention, and ensuring the packaging film surface is free of stains, bubbles, and other defects. The cleaning mechanism is driven by a screw-driven moving frame. The roller brush moves along the surface of the filter frame, thoroughly removing blockages from the filter frame's pores. As the roller brush rotates, a scraper cleans its surface in real time, maintaining cleaning efficiency. The scraper is driven by a cylinder to switch working surfaces with a rack and pinion, with the adhesive surface facing the moving block. The moving block, driven by a threaded rod, drives the scraper to slide. In conjunction with the rotation of the second cam, the scraper is pushed intermittently. Guided by the second slide rod and under the elastic force of the second spring, the scraper slides back and forth, shaking off the impurities cleaned from the scraper. This efficiently removes impurities adhering to the scraper, achieving self-maintenance of the filter frame and cleaning components, extending the continuous operation cycle of the equipment, reducing the frequency of downtime maintenance, and further improving the automation level and finished product quality of book packaging. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the dust removal mechanism of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the dust collection box of this utility model;

[0022] Figure 4 This is a schematic diagram of the cleaning mechanism of this utility model;

[0023] Figure 5 This utility model Figure 4 Enlarged schematic diagram of the structure at point A in the diagram.

[0024] In the diagram: 1. Fixed frame; 2. Mounting frame; 3. Two-way lead screw; 4. Carbon fiber brush; 5. Electrostatic generator; 6. Conductive slip ring; 7. Dust removal mechanism; 701. Dust suction port; 702. Dust collection box; 703. Negative pressure fan; 704. Filter frame; 705. Scraper; 706. First slide rod; 707. First spring; 708. First cam; 709. Connecting pipe; 8. Cleaning mechanism; 801. Moving frame; 802. Roller brush; 803. Screw; 804. Scraper; 805. Gear; 806. Rack; 807. Cylinder; 808. Moving block; 809. Threaded rod; 810. Scraper block; 811. Second slide rod; 812. Second spring; 813. Second cam. Detailed Implementation

[0025] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0026] Figures 1-5In one embodiment of this utility model, a device for book packaging includes a fixed frame 1 and two sets of mounting brackets 2 slidably mounted on the fixed frame 1. A bidirectional lead screw 3 is rotatably mounted on the fixed frame 1, with both ends of the bidirectional lead screw 3 passing through the two sets of mounting brackets 2 and threadedly connected to them respectively. Carbon fiber brushes 4 are rotatably mounted on each set of mounting brackets 2. Conductive slip rings 6 are mounted on the mounting brackets 2. An electrostatic generator 5 is provided on one side of the fixed frame 1, and a dust removal mechanism 7 is provided on the fixed frame 1. The dust removal mechanism 7 includes a dust collection box 702 disposed on one side of the fixed frame 1, and a dust collection port 701 fixedly mounted on the mounting brackets 2 and in contact with the carbon fiber brushes 4. The dust collection port 701 is fixedly connected to the dust collection box 702 through a connecting pipe 709. A negative pressure fan 703 is embedded in the dust collection box 702, and a filter frame 704 is provided inside the dust collection box 702. The filter frame 704 is located between the connection point of the connecting pipe 709 and the dust collection box 702 and the negative pressure fan 703. The rotation direction of the carbon fiber brush 4 on the mounting frame 2 is opposite to the conveying direction of the book packaging film. Both sets of mounting frames 2 are slidably mounted with scraper brushes 705, and the scraper brushes 705 are set in close contact with the carbon fiber brush 4. The dust collection box 702 is equipped with a cleaning mechanism 8 for cleaning the filter frame 704. The two sets of mounting frames 2 are driven to move synchronously in opposite directions through the bidirectional lead screw 3, which can adapt to book packaging films of different thicknesses. With the electrostatic dust removal design of the carbon fiber brush 4, it can effectively remove dust and impurities adsorbed on the film surface. The conductive slip ring 6 ensures that the high voltage of the electrostatic generator 5 is continuously and stably transmitted to the rotating carbon fiber brush 4, which enhances the electrostatic adsorption effect. The scraper brush 705 achieves reciprocating scraping through the cooperation of the first cam 708 and the first spring 707, which avoids the accumulation of pollutants on the brush surface. The negative pressure fan 703 in the dust removal mechanism 7 works in conjunction with the dust suction port 701 to directly collect the stripped pollutants, which significantly improves the cleaning efficiency, reduces manual intervention, and ensures that there are no defects such as stains and bubbles on the surface of the packaging film.

[0027] In this embodiment, reference Figure 2 , Figure 3As shown, the rotor end of the conductive slip ring 6 is fixed to the rotating shaft end of the carbon fiber brush 4 by a heat-shrink process. The stator end of the conductive slip ring 6 is fixedly mounted on the mounting bracket 2 by an insulating flange. The high voltage output end of the electrostatic generator 5 is connected to the input contact of the stator end of the conductive slip ring 6 by a shielded cable. The output contact of the rotor end of the conductive slip ring 6 is connected to the carbon fiber brush 4. A first slide rod 706 is fixedly installed inside the mounting bracket 2. The scraper 705 is slidably sleeved with the first slide rod 706. Two sets of symmetrically distributed first springs 707 are sleeved on the first slide rod 706. The two ends of the two sets of first springs 707 are fixedly connected to the scraper 705 and the mounting bracket 2, respectively. A first cam 708 is rotatably mounted on the mounting bracket 2, and the first cam 708 is fitted with the scraper 705. When the motor in the fixed bracket 1 drives the bidirectional lead screw 3 to rotate, it drives the two sets of mounting brackets 2 to move synchronously in opposite directions or in opposite directions, adjusting the spacing of the carbon fiber brushes 4 to adapt to book packaging films of different thicknesses. The electrostatic generator 5 applies high-voltage static electricity to the rotating carbon fiber brush 4 through the conductive slip ring 6, enabling the brush to efficiently adsorb dust and impurities on the film surface during rotation. At the same time, the scraper 705 reciprocates under the periodic push of the first cam 708 and the elastic reset of the first spring 707, continuously scraping away the pollutants accumulated on the surface of the carbon fiber brush 4, ensuring stable brush cleaning ability. The negative pressure fan 703 creates negative pressure in the dust collection box 702, causing the dust collection port 701 to suck the stripped dust and impurities into the dust collection box 702 through the connecting pipe 709. The filter frame 704 intercepts pollutants and prevents them from entering the fan, thereby achieving efficient dust removal of the packaging film and avoiding the generation of stains and bubbles.

[0028] In this embodiment, reference Figure 4 and Figure 5As shown, the cleaning mechanism 8 includes a movable frame 801 slidably installed inside a dust collection box 702, and a screw 803 rotatably installed inside the dust collection box 702. The screw 803 passes through the movable frame 801 and is threadedly connected to the movable frame 801. A roller brush 802 is rotatably installed on the movable frame 801 and is in contact with the surface of the filter frame 704. A scraper 804 is rotatably installed on the movable frame 801 and is in contact with the roller brush 802. A movable block 808 is slidably installed inside the movable frame 801. A threaded rod 809 is rotatably installed inside the movable frame 801 and passes through the movable block 808 and is threadedly connected to the screw 803. The moving block 808 is threadedly connected. A gear 805 is sleeved on the scraper 804. A rack 806 is slidably installed inside the moving frame 801, and the rack 806 meshes with the gear 805. A cylinder 807 is fixedly installed inside the moving frame 801, and the rack 806 is fixedly connected to the output end of the piston rod of the cylinder 807. A scraper block 810 is slidably installed inside the moving block 808, and the scraper block 810 is slidably sleeved with one side of the scraper 804. A second slide rod 811 is fixedly installed inside the moving block 808, and the scraper block 810 is slidably sleeved with the second slide rod 811. A second cam 813 is rotatably installed inside the moving block 808, and the second cam 813 is rotatably sleeved with the scraper block 810. In the fitting configuration, two sets of symmetrically distributed second springs 812 are sleeved on the second slide rod 811. The two ends of the two sets of second springs 812 are fixedly connected to the scraper block 810 and the moving block 808, respectively. The screw 803 in the cleaning mechanism 8 drives the moving frame 801 to move along the dust collection box 702, causing the roller brush 802 to roll against the surface of the filter frame 704 to remove dust clogging the pores. When the roller brush 802 rotates, the scraper 804 closely scrapes off the adhering impurities, maintaining the cleaning efficiency of the roller brush 802. When the working surface of the scraper 804 is contaminated, the cylinder 807 pushes the rack 806 to mesh with the gear 805, causing the scraper 804 to flip. When the working surface is switched so that the contaminated surface faces the moving block 808, the motor inside the moving frame 801 drives the threaded rod 809 to rotate. The threaded rod 809 drives the moving block 808 to slide the scraper 810. At the same time, the motor inside the moving block 808 drives the second cam 813 to rotate. The second cam 813 intermittently pushes the scraper 810. Under the guidance of the second slide rod 811 and the elastic reset action of the second spring 812, the scraper 810 reciprocates, shaking off the impurities adhering to the surface of the scraper 804. This ensures that the scraper 804 works continuously and effectively. This self-cleaning mechanism reduces the need for manual cleaning, improves the continuous operation efficiency of the equipment, and ensures the quality of the finished book packaging.

[0029] In this embodiment, when the motor drives the bidirectional lead screw 3 in the fixing frame 1 to rotate, it drives the two sets of mounting frames 2 to move synchronously in opposite directions, adjusting the spacing of the carbon fiber brushes 4 to adapt to book packaging films of different thicknesses. The electrostatic generator 5 applies high-voltage static electricity to the rotating carbon fiber brush 4 via the conductive slip ring 6, enabling the brush to efficiently adsorb dust and impurities from the film surface during rotation. Simultaneously, the scraper 705 reciprocates under the periodic pushing of the first cam 708 and the elastic reset of the first spring 707, continuously scraping away contaminants accumulated on the surface of the carbon fiber brush 4, ensuring stable brush cleaning performance. The negative pressure fan 703 creates negative pressure within the dust collection box 702, causing the suction port 701 to draw the detached dust and impurities into the dust collection box 702 through the connecting pipe 709. The filter frame 704 intercepts contaminants, preventing them from entering the fan, thus achieving efficient dust removal from the packaging film and avoiding the formation of stains and bubbles. The screw 803 in the cleaning mechanism drives the moving frame 801 to move along the inside of the dust collection box 702, causing the roller brush 802 to roll against the surface of the filter frame 704, removing dust clogging the pores. 2. During rotation, the scraper 804 closely adheres to the surface to scrape off the adhering impurities, maintaining the cleaning efficiency of the roller brush 802. When the working surface of the scraper 804 becomes contaminated, the cylinder 807 pushes the rack 806 to mesh with the gear 805, causing the scraper 804 to flip and switch working surfaces, with the contaminated surface facing the moving block 808. The motor inside the moving frame 801 drives the threaded rod 809 to rotate, and the threaded rod 809 drives the moving block 808 to slide the scraper 810. At the same time, the motor inside the moving block 808 drives the second cam 813 to rotate, and the second cam 813 intermittently pushes the scraper 810. Under the guidance of the second slide rod 811 and the elastic reset action of the second spring 812, the scraper 810 reciprocates, shaking off the impurities adhering to the surface of the scraper 804, ensuring that the scraper 804 works continuously and effectively. This self-cleaning mechanism reduces the need for manual cleaning, improves the continuous operation efficiency of the equipment, and ensures the quality of the finished product of book packaging.

[0030] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0031] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for book packaging, comprising a fixing frame (1) and two sets of mounting brackets (2) slidably mounted on the fixing frame (1), characterized in that: A bidirectional screw (3) is rotatably mounted on the fixed frame (1). The two ends of the bidirectional screw (3) pass through two sets of mounting frames (2) and are threadedly connected to the two sets of mounting frames (2). A carbon fiber brush (4) is rotatably mounted on each of the two sets of mounting frames (2). A conductive slip ring (6) is mounted on the mounting frame (2). An electrostatic generator (5) is provided on one side of the fixed frame (1). A dust removal mechanism (7) is provided on the fixed frame (1). The dust removal mechanism (7) includes a dust collection box (702) set on one side of the fixed frame (1) and a dust collection port (701) fixedly installed on the mounting frame (2) and attached to the carbon fiber brush (4). The dust collection port (701) is fixedly connected to the dust collection box (702) through the connecting pipe (709). A negative pressure fan (703) is embedded in the dust collection box (702). A filter frame (704) is provided inside the dust collection box (702). The filter frame (704) is located between the connection between the connecting pipe (709) and the dust collection box (702) and the negative pressure fan (703). The rotation direction of the carbon fiber brush (4) on the two sets of mounting frames (2) is opposite to the conveying direction of the book packaging film. A scraper (705) is slidably installed on both sets of mounting frames (2), and the scraper (705) is attached to the carbon fiber brush (4). A cleaning mechanism (8) for cleaning the filter frame (704) is provided inside the dust collection box (702).

2. The device for book packaging according to claim 1, characterized in that: The rotor end of the conductive slip ring (6) is fixed to the rotating shaft end of the carbon fiber brush (4) by a heat-shrink process. The stator end of the conductive slip ring (6) is fixed on the mounting bracket (2) by an insulating flange. The high voltage output end of the electrostatic generator (5) is connected to the input contact of the stator end of the conductive slip ring (6) by a shielded cable. The output contact of the rotor end of the conductive slip ring (6) is connected to the carbon fiber brush (4).

3. The device for book packaging according to claim 1, characterized in that: The mounting bracket (2) is fixedly installed with a first slide rod (706). The scraper (705) is slidably sleeved with the first slide rod (706). Two sets of symmetrically distributed first springs (707) are sleeved on the first slide rod (706). The two ends of the two sets of first springs (707) are fixedly connected to the scraper (705) and the mounting bracket (2) respectively. A first cam (708) is rotatably installed on the mounting bracket (2), and the first cam (708) is fitted with the scraper (705).

4. The device for book packaging according to claim 1, characterized in that: The cleaning mechanism (8) includes a movable frame (801) slidably installed in a dust collection box (702), and a screw (803) rotatably installed in the dust collection box (702). The screw (803) passes through the movable frame (801) and is threadedly connected to the movable frame (801). A roller brush (802) is rotatably installed on the movable frame (801), and the roller brush (802) is in contact with the surface of the filter frame (704). A scraper (804) is rotatably installed on the movable frame (801), and the scraper (804) is in contact with the roller brush (802). A movable block (808) is slidably installed in the movable frame (801). A threaded rod (809) is rotatably installed in the movable frame (801), and the threaded rod (809) passes through the movable block (808) and is threadedly connected to the movable block (808).

5. The device for book packaging according to claim 4, characterized in that: A gear (805) is sleeved on the scraper (804), and a rack (806) is slidably installed inside the movable frame (801). The rack (806) meshes with the gear (805), and a cylinder (807) is fixedly installed inside the movable frame (801). The rack (806) is fixedly connected to the output end of the piston rod of the cylinder (807).

6. The device for book packaging according to claim 4, characterized in that: A scraper block (810) is slidably installed inside the movable block (808), and the scraper block (810) is slidably sleeved with one side of the scraper (804). A second slide rod (811) is fixedly installed inside the movable block (808), and the scraper block (810) is slidably sleeved with the second slide rod (811). A second cam (813) is rotatably installed inside the movable block (808), and the second cam (813) is fitted with the scraper block (810).

7. The device for book packaging according to claim 6, characterized in that: The second slide bar (811) is fitted with two sets of symmetrically distributed second springs (812), and the two ends of the two sets of second springs (812) are fixedly connected to the scraper (810) and the moving block (808) respectively.