Glue breaking mechanism of primer wheel of primer machine

Abstract

The utility model discloses a glue breaking mechanism of a primer wheel of a primer machine. The glue breaking mechanism comprises a knife switch, a curved bar, a rotating shaft and a chain wheel assembly, the chain wheel assembly comprises a first chain wheel, a second chain wheel, a chain and a rotation driving device, the rotation driving device drives the second chain wheel, and the chain drives the first chain wheel and the rotating shaft to rotate synchronously; one end of the cranked lever is connected with the rotating shaft, and the other end of the cranked lever extends into the glue groove and is connected with a knife switch which is horizontally arranged on one side of the bottom glue wheel; the rotary driving device rotates positively and negatively to drive the curved bar to swing left and right to realize contact and separation of the knife switch and the side surface of the bottom rubber wheel to finish rubber breaking and coating; one side of the chain is designed to be of a fracture structure, and the fracture position is connected through a buffer assembly to adapt to the high-speed frequent glue breaking working condition. Through the design of chain wheel transmission and the buffer assembly, accurate glue breaking and gluing control is achieved, the stability of the glue breaking mechanism is enhanced, and the glue breaking mechanism is suitable for the production requirement for high-speed frequent glue breaking.

Description

Technical Field

[0001] This utility model relates to the field of book binding technology, specifically to a glue-cutting mechanism for the bottom glue wheel of a bottom glue machine. Background Technology

[0002] In the bookbinding industry, the main function of a bottom gluing machine is to evenly apply hot melt adhesive to the bottom of the book block to ensure a firm bond with the pages. During operation, the design of the glue-cutting mechanism is crucial for controlling the application and stopping of the adhesive, directly impacting the quality and efficiency of bookbinding.

[0003] Currently, some adhesive binding machines use pneumatic control for their adhesive cutting devices, such as the pneumatic adhesive cutting device for adhesive binding machines disclosed in prior art document 1 (CN105774293A). This device directly controls the opening and closing of the scraper blade through a cylinder, and uses a rotating shaft to achieve mechanical linkage. The scraper blade acts vertically on the side of the glue wheel, and the adhesive cutting function is achieved by the extension and retraction of the cylinder.

[0004] The above design has certain limitations. The drawback is that, firstly, the extension and retraction speed and force of the cylinder are difficult to control precisely, especially under high-speed conditions. Frequent glue-cutting operations can easily lead to unstable contact force between the glue scraper and the glue wheel, which in turn affects the accuracy of glue cutting and application, and may cause binding problems, such as uneven glue layer, too much or too little glue, etc., affecting the binding quality.

[0005] Furthermore, as the bookbinding industry continues to demand higher production efficiency, glue-cutting machines need to operate at higher speeds, requiring glue-cutting mechanisms to have faster response times and more stable performance. However, under high-speed, frequent glue-cutting conditions, existing pneumatic glue-cutting devices not only generate significant noise and vibration from the frequent cylinder movements, but may also accelerate the wear of the cylinder and related components, reducing the equipment's lifespan.

[0006] Therefore, a glue-cutting mechanism for the bottom rubber roller of a glue-cutting machine is needed, which is suitable for high-speed and frequent glue-cutting conditions. Utility Model Content

[0007] The purpose of this invention is to address the problems existing in the prior art by providing a glue-cutting mechanism for the bottom glue wheel of a glue-cutting machine. Through the design of sprocket transmission and buffer components, it achieves precise glue-cutting and glue-applying control, enhances the stability of the glue-cutting mechanism, and is suitable for high-speed and frequent glue-cutting production needs.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A glue-cutting mechanism for a base rubber roller of a base rubber machine is disclosed. The base rubber roller is laterally rotatable within the glue tank of the base rubber machine. The glue-cutting mechanism includes a guillotine, a crank, a rotating shaft, and a sprocket assembly. The sprocket assembly includes a first sprocket, a second sprocket, a chain, and a rotary drive device. The rotary drive device is fixedly mounted on the frame of the base rubber machine, and its output shaft is connected to the second sprocket. The first sprocket is connected to the frame of the base rubber machine via the rotating shaft, and a chain connects the first sprocket and the second sprocket. One end of the crank is connected to the rotating shaft via a loop and rotates with it. The other end of the crank extends into the glue tank and is connected to the guillotine, which is horizontally positioned on one side of the base rubber roller. The rotary drive device rotates in both directions, causing the crank to swing left and right, thereby causing the guillotine to contact and separate from the side of the base rubber roller, achieving glue cutting and application. One side of the chain has a fracture structure, and the two ends of the fracture point of the chain are connected by a buffer assembly.

[0010] Furthermore, the buffer assembly includes a first connecting block, a second connecting block, a first bolt, and a first spring; the first connecting block connects to one end of the broken section of the chain, the second connecting block connects to the other end of the broken section of the chain, the first connecting block has a threaded hole, the second connecting block has a through hole, the bolt of the first bolt passes through the through hole and is threadedly connected to the threaded hole; the two ends of the first spring are respectively connected to the two ends of the broken section of the chain.

[0011] Furthermore, both ends of the first spring are provided with hooks, and both ends of the broken part of the chain are provided with hook holes, with the hooks at both ends of the first spring respectively connecting to the two hook holes.

[0012] Furthermore, the glue tank is provided with a mounting block, which is connected to a second bolt by a thread; when the glue is cut off, the second bolt abuts against the crank rod to limit the movement, so that there is a small gap between the guillotine and the bottom rubber wheel.

[0013] Furthermore, the mounting block is provided with a third bolt, the crank is provided with a fourth bolt, and a second spring is connected between the third bolt and the fourth bolt.

[0014] Furthermore, each end of the guillotine is provided with a scraper, and the two scrapers extend to contact the two end faces of the bottom rubber wheel.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. By rotating the rotary drive device in both directions and combining it with the sprocket drive, precise control of the contact and separation between the guillotine and the bottom glue wheel is achieved. This effectively reduces binding problems caused by glue breakage and inaccurate glue application timing under high-speed conditions, and significantly improves the quality of bookbinding.

[0017] 2. Through the design of the chain's fracture structure and buffer components, the chain can be effectively buffered during tensioning, avoiding frequent exposure to excessive instantaneous forces. This not only protects the chain from damage but also reduces the motor load and extends the motor's service life. It is particularly suitable for high-speed, frequent rubber breakage conditions.

[0018] 3. When the glue is cut off, the second bolt and the crank rod abut against each other to limit the movement, creating a small gap between the guillotine and the bottom rubber wheel. This small gap not only meets the functional requirements of cutting off the glue, but also avoids direct contact between the guillotine and the bottom rubber wheel, effectively preventing damage to the components caused by direct friction and scratches, reducing component wear and replacement frequency, and lowering maintenance costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the connection structure of the glue-cutting mechanism, the bottom glue wheel, and the glue groove in one embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the overall structure of the glue-cutting mechanism in one embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the sprocket assembly in one embodiment of this application;

[0023] In the diagram: 1. Bottom rubber wheel; 2. Knife gate; 3. Crank rod; 4. Rotating shaft; 5. Sprocket assembly; 6. First sprocket; 7. Second sprocket; 8. Chain; 9. Rotary drive device; 10. Rubber groove; 11. First connecting block; 12. Second connecting block; 13. First bolt; 14. First spring; 15. Mounting block; 16. Second bolt; 17. Third bolt; 18. Fourth bolt; 19. Second spring; 20. Scraper. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In the bookbinding industry, the main function of a bottom gluing machine is to evenly apply hot melt adhesive to the bottom of the book block to ensure a firm bond with the pages. During operation, the design of the glue-cutting mechanism is crucial for controlling the application and stopping of the adhesive, directly impacting the quality and efficiency of bookbinding.

[0029] Currently, some adhesive binding machines use pneumatic control for their adhesive cutting devices, such as the pneumatic adhesive cutting device for adhesive binding machines disclosed in prior art document 1 (CN105774293A). This device directly controls the opening and closing of the scraper blade through a cylinder, and uses a rotating shaft to achieve mechanical linkage. The scraper blade acts vertically on the side of the glue wheel, and the adhesive cutting function is achieved by the extension and retraction of the cylinder.

[0030] The above design has certain limitations. The drawback is that, firstly, the extension and retraction speed and force of the cylinder are difficult to control precisely, especially under high-speed conditions. Frequent glue-cutting operations can easily lead to unstable contact force between the glue scraper and the glue wheel, which in turn affects the accuracy of glue cutting and application, and may cause binding problems, such as uneven glue layer, too much or too little glue, etc., affecting the binding quality.

[0031] Furthermore, as the bookbinding industry continues to demand higher production efficiency, glue-cutting machines need to operate at higher speeds, requiring glue-cutting mechanisms to have faster response times and more stable performance. However, under high-speed, frequent glue-cutting conditions, existing pneumatic glue-cutting devices not only generate significant noise and vibration from the frequent cylinder movements, but may also accelerate the wear of the cylinder and related components, reducing the equipment's lifespan.

[0032] Therefore, a glue-cutting mechanism for the bottom rubber roller of a glue-cutting machine is needed, which is suitable for high-speed and frequent glue-cutting conditions.

[0033] To address the above technical issues, such as Figures 1 to 3 As shown, this embodiment provides a glue-cutting mechanism for the bottom rubber wheel of a base rubber machine. The bottom rubber wheel 1 is rotatably mounted in the glue tank 10 of the base rubber machine. The glue-cutting mechanism includes a guillotine 2, a crank 3, a rotating shaft 4, and a sprocket assembly 5. The sprocket assembly 5 includes a first sprocket 6, a second sprocket 7, a chain 8, and a rotary drive device 9. The rotary drive device 9 is fixedly mounted on the frame of the base rubber machine, and its output shaft is connected to the second sprocket 7. The first sprocket 6 is connected to the frame of the base rubber machine through the rotating shaft 4. A chain 8 is connected between the sprockets 7; one end of the crank 3 is connected to the rotating shaft 4 through a ring and rotates with it, and the other end of the crank 3 extends into the glue groove 10 and is connected to the guillotine 2, which is horizontally positioned on one side of the bottom rubber wheel 1; the rotary drive device 9 drives the crank 3 to swing left and right by rotating forward and backward, thereby causing the guillotine 2 to contact and separate from the side of the bottom rubber wheel 1, realizing glue cutting and glue application; one side of the chain 8 has a broken structure, and the two ends of the broken part of the chain 8 are connected by a buffer assembly.

[0034] When the rotary drive device 9 is started, its output shaft drives the second sprocket 7 to rotate, which in turn drives the first sprocket 6 and the rotating shaft 4 to rotate synchronously via the chain 8. Since one end of the crank 3 is looped and connected to the rotating shaft 4, it will swing left and right following the rotation of the rotating shaft 4.

[0035] The other end of the curved rod 3 extends into the glue groove 10 and is connected to a gate 2. The gate 2 is horizontally positioned on one side of the bottom glue roller 1. By rotating the rotary drive device 9 in both directions, the curved rod 3 can be driven to swing left and right, thereby controlling the contact and separation between the gate 2 and the side of the bottom glue roller 1. When the gate 2 contacts the bottom glue roller 1, the glue cutting function is realized; when the gate 2 separates from the bottom glue roller 1, the bottom glue roller 1 can normally carry the hot melt glue in the glue groove to apply glue to the book block.

[0036] Driven by the motion fixture, the book block moves in a side-standing position with its spine facing down. As the book block passes over the bottom rubber roller 1, the rotating side of the bottom rubber roller 1 contacts the bottom side of the spine of the book block, evenly applying hot melt adhesive to the bottom side of the book block to facilitate subsequent bonding with the pages.

[0037] One side of chain 8 is designed with a fracture structure, and the two ends of the fracture are connected by a buffer assembly. When no glue-cutting operation is performed, the chain is in a slack state. When glue cutting is required, the rotary drive device 9 moves the chain to tension it. Due to the presence of the buffer assembly, the chain tensioning process is buffered, gradually tightening to avoid being affected by excessive instantaneous force.

[0038] In this embodiment, the forward and reverse rotation of the rotary drive device 9, using a sprocket drive, allows for precise control of the contact and separation between the guillotine 2 and the bottom rubber wheel 1 under high-speed conditions. This enables precise control of glue cutting and application, reducing binding problems caused by inaccurate timing of glue cutting and application.

[0039] Under high-speed operating conditions, more frequent glue-cutting operations are required, resulting in greater inertial forces. This places higher demands on the stability of the glue-cutting mechanism. This embodiment utilizes the fracture structure and buffer component design of chain 8 to provide a buffering process during chain tensioning, gradually tightening the chain and avoiding frequent exposure to excessive instantaneous forces. This is particularly suitable for high-speed, frequent glue-cutting conditions. This protects the chain from damage, reduces the motor load, and extends the motor's lifespan.

[0040] like Figure 3 As shown, in some embodiments, one side of the chain 8 is a broken structure, and the two ends of the broken part of the chain 8 are connected by a buffer assembly; the buffer assembly includes a first connecting block 11, a second connecting block 12, a first bolt 13, and a first spring 14; the first connecting block 11 is connected to one end of the broken part of the chain 8, and the second connecting block 12 is connected to the other end of the broken part of the chain 8. The first connecting block 11 is provided with a threaded hole, and the second connecting block 12 is provided with a through hole. The screw of the first bolt 13 passes through the through hole and is threadedly connected to the threaded hole; the two ends of the first spring 14 are respectively connected to the two ends of the broken part of the chain 8.

[0041] When the chain 8 is under tension, the first spring 14 undergoes elastic deformation and elongates, while the first bolt 13 moves within the through hole of the second connecting block 12 until its head abuts against the second connecting block 12. Through the elastic deformation of the first spring 14 and the movement of the first bolt 13 within the through hole, the chain 8 is effectively buffered during tensioning, preventing chain damage or excessive motor load caused by excessive instantaneous force, thereby extending the service life of the chain and motor.

[0042] The length by which the first bolt 13 is screwed into the first connecting block 11 can be used to set the buffer distance, thus avoiding the buffer distance from being too short.

[0043] like Figure 3 As shown, in some embodiments, both ends of the first spring 14 are provided with hooks, and both ends of the broken part of the chain 8 are provided with hook holes, and the hooks at both ends of the first spring 14 are respectively connected to the two hook holes.

[0044] The connection between the hook and the hook hole is simple and reliable, which not only ensures a stable connection between the first spring 14 and the chain 8, but also facilitates quick disassembly and replacement when needed, reducing maintenance costs and time.

[0045] It should be noted that, Figure 3 To facilitate the display of the hook bending result, the lower end of the first spring 14 and the hook hole are displayed separately.

[0046] like Figure 2 As shown, in some embodiments, the glue tank 10 is provided with a mounting block 15, which is connected to a second bolt 16 by a thread; when the glue is cut off, the second bolt 16 abuts against the crank 3 to limit the movement, so that there is a small gap between the guillotine 2 and the bottom rubber wheel.

[0047] When the glue-cutting mechanism performs the glue-cutting operation, as the rotary drive device 9 drives the crank 3 to swing to the corresponding position, the second bolt 16 will abut against the crank 3 for limiting. Due to the precise positioning effect of the second bolt 16, a tiny gap is formed between the guillotine 2 connected to the crank 3 and the bottom rubber roller 1. This tiny gap is designed based on the glue-cutting requirements. During the glue-cutting process, the hot melt adhesive cannot continue to be carried out from the bottom rubber roller 1 through this tiny gap, thus achieving the glue-cutting effect.

[0048] On the one hand, the minute gap is sufficient to meet the functional requirements of adhesive cutting, ensuring the reliability and effectiveness of the adhesive cutting operation. On the other hand, the minute gap design avoids direct contact between the guillotine 2 and the bottom rubber roller, effectively preventing component damage caused by direct friction and scratching during long-term and frequent use, reducing component wear and replacement frequency, and lowering maintenance costs.

[0049] The tiny gap serves to cut off the rubber. By setting the tiny gap, direct contact between the guillotine 2 and the bottom rubber wheel is avoided, which would cause scratches due to long-term and frequent use.

[0050] In some embodiments, the mounting block 15 is provided with a third bolt 17, the crank 3 is provided with a fourth bolt 18, and a second spring 19 is connected between the third bolt 17 and the fourth bolt 18.

[0051] During the glue-cutting operation, the sprocket assembly, driven by the rotary drive device 9, causes the crank rod 3 to shift. Simultaneously, the second spring 19 also works in concert, assisting the sprocket assembly in driving the crank rod 3 to complete the required displacement for glue cutting. During the glue application process, the bottom rubber roller 1 moves the glue, which exerts a radially outward force on the gate 2. At this time, the second spring 19, with its elastic restoring force, exerts a counterforce on the crank rod 3 to counteract the radially outward force of the glue on the gate 2. This prevents unnecessary displacement or wobbling of the gate 2 due to this force, ensuring the stability of the gap between the gate 2 and the bottom rubber roller 1, thereby guaranteeing the accuracy of glue cutting and application.

[0052] In some embodiments, the two ends of the gate 2 are respectively provided with scrapers 20, and the two scrapers 20 extend to contact the two end faces of the bottom rubber wheel 1.

[0053] Because the end face of the bottom rubber roller 1 is in contact with or in relative motion with the adhesive and surrounding components, the adhesive may gradually accumulate on both end faces of the bottom rubber roller 1. The scrapers 20 located at both ends of the switch 2 continuously scrape the two end faces of the bottom rubber roller 1 according to the relative position of the switch 2 and the bottom rubber roller 1 and the rotation of the bottom rubber roller 1 itself, removing the adhesive accumulated on the end faces in a timely manner, ensuring the cleanliness of the end faces of the bottom rubber roller 1 and ensuring the smooth rotation of the bottom rubber roller 1.

[0054] 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 mechanism for breaking the adhesive of a wheel of an adhesive applicator, the wheel (1) being arranged to rotate laterally in an adhesive tank (10) of the applicator, characterized in that, The glue-cutting mechanism includes a guillotine (2), a crank (3), a rotating shaft (4), and a sprocket assembly (5); The sprocket assembly (5) includes a first sprocket (6), a second sprocket (7), a chain (8), and a rotary drive device (9); The rotary drive device (9) is fixedly mounted on the frame of the base adhesive machine. Its output shaft is connected to the second sprocket (7). The first sprocket (6) is connected to the frame of the base adhesive machine through the rotating shaft (4). A chain (8) is connected between the first sprocket (6) and the second sprocket (7). One end of the crank (3) is connected to the rotating shaft (4) through a loop and rotates with it. The other end of the crank (3) extends into the rubber groove (10) and is connected to the guillotine (2). The guillotine (2) is horizontally positioned on one side of the bottom rubber wheel (1). One side of the chain (8) is a broken structure, and the two ends of the broken part of the chain (8) are connected by a buffer assembly.

2. A mechanism for breaking the adhesive of the adhesive wheel of the adhesive machine according to claim 1, characterized in that, The buffer assembly includes a first connecting block (11), a second connecting block (12), a first bolt (13), and a first spring (14); the first connecting block (11) is connected to one end of the broken part of the chain (8), the second connecting block (12) is connected to the other end of the broken part of the chain (8), the first connecting block (11) is provided with a threaded hole, the second connecting block (12) is provided with a through hole, and the screw of the first bolt (13) passes through the through hole and is threadedly connected to the threaded hole; The two ends of the first spring (14) are respectively connected to the two ends of the broken part of the chain (8).

3. A mechanism for breaking the adhesive of the adhesive wheel of the adhesive machine according to claim 2, characterized in that, The first spring (14) has hooks at both ends, and the chain (8) has hook holes at both ends of the broken section. The hooks at both ends of the first spring (14) are respectively connected to the two hook holes.

4. The adhesive breaking mechanism of the adhesive wheel of the adhesive spreading machine according to claim 1, wherein, The glue tank (10) is provided with a mounting block (15), and the mounting block (15) is connected to a second bolt (16) by a thread. When the rubber is cut off, the second bolt (16) abuts against the crank (3) to limit the movement, so that there is a small gap between the guillotine (2) and the bottom rubber wheel.

5. A mechanism for breaking the adhesive of the adhesive wheel of the adhesive machine according to claim 4, characterized in that, The mounting block (15) is provided with a third bolt (17), the crank (3) is provided with a fourth bolt (18), and a second spring (19) is connected between the third bolt (17) and the fourth bolt (18).

6. A mechanism for breaking the adhesive of the adhesive wheel of the adhesive machine according to claim 1, characterized in that, The two ends of the guillotine (2) are respectively provided with scrapers (20), and the two scrapers (20) extend to contact the two end faces of the bottom rubber wheel (1).

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