Automatic feeding and rejecting device for double envelopes of glue binding machine

Abstract

The invention relates to the technical field of automatic removing of double envelope pages of a glue binding machine, in particular to an automatic feeding and removing device for the double envelope pages of the glue binding machine, which comprises a support, support plates and a transportation assembly, the two parallel support plates are mounted on two sides of the support, and the transportation assembly is mounted between the two support plates; the device further comprises a removing assembly and a collecting assembly, the removing assembly is installed at the top of the conveying assembly, the collecting assembly is installed at the top of the conveying assembly and located on one side of the removing assembly, and the removing assembly adsorbs the covers on the conveying assembly through negative pressure and conveys the covers to the collecting assembly to be collected. The automatic removing device solves the problems that in the automatic removing process of the repeated envelope pages of an existing glue binding machine, the removing cost and time are increased and the removing efficiency is reduced through removing by weight; the repeated pages are separated and removed in the process of automatically removing the repeated pages of the envelopes of the glue binding machine, the cost is reduced, the removing time is saved, and the removing efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic rejection of double - page covers in a bookbinding machine, and particularly to an automatic rejection device for feeding double - page covers in a bookbinding machine. Background Art

[0002] The automatic rejection device for feeding double - page covers in a bookbinding machine is a device component used in a bookbinding machine, mainly for dealing with the problem of multiple - page input of covers. When detecting that multiple pages of covers are input, this device can reject the double - page covers to avoid wrinkles and blockages of the covers in the device.

[0003] In the existing automatic rejection device for double - page covers in a bookbinding machine, during the process of transporting covers by a belt, the covers are rejected by detecting the weight of a single cover. When a double - page cover passes by, the entire double - page cover will be rejected.

[0004] In the above - mentioned rejection process, the entire double - page is rejected, and the double - page cannot be separated. Subsequently, the double - page still needs to be separated, which increases the cost and separation time and reduces the rejection efficiency.

[0005] In view of the above situation, in order to overcome the above - mentioned technical problems, the present invention designs an automatic rejection device for feeding double - page covers in a bookbinding machine, which solves the above - mentioned technical problems. Summary of the Invention

[0006] The technical purpose to be achieved by the present invention is: to solve the problem that in the existing automatic rejection process of double - page covers in a bookbinding machine, rejection by weight increases the rejection cost and time and reduces the rejection efficiency; to achieve the separation and rejection of double - pages during the automatic rejection process of double - page covers in a bookbinding machine, which reduces the cost, saves the rejection time, and greatly improves the rejection efficiency.

[0007] In order to achieve the above - mentioned technical purpose, the present invention provides the following technical solutions: An automatic rejection device for feeding double - page covers in a bookbinding machine, comprising: a bracket, a support plate, and a transport component. Two mutually parallel support plates are installed on both sides of the bracket, and a transport component is installed between the two support plates; It further includes a rejection component and a collection component. The rejection component is installed on the top of the transport component, and the collection component is installed on the top of the transport component and is located on one side of the rejection component. The rejection component adsorbs the cover on the transport component through negative pressure and transports the cover to the collection component for collection.

[0008] The support plates are fixed on both sides of the bracket to form a stable installation framework. It is located directly above the transport component and adopts the principle of negative - pressure adsorption. Through the mutual cooperation of the rejection component and the transport component, the redundant upper - layer covers are adsorbed and separated.

[0009] Preferably, the rejection component includes side plates, connecting blocks, fixing blocks, rotating wheels, rejection belts, a first air pump, a first air pipe, and a first motor; two mutually parallel side plates are installed on the transportation component, the connecting block is installed between the two mutually parallel side plates, the fixing block is installed on the connecting block, a plurality of the rotating wheels are respectively rotatably installed on both sides of the fixing block, the rejection belt is rotatably installed on the plurality of rotating wheels, and the rejection belt is in sliding contact with the fixing block, the first air pump is installed on the bracket, one end of the first air pipe is installed on the first air pump, and the other end is connected to the fixing block, the first motor is installed on one side of the side plate and is connected to the rotating wheel, a support is provided at the bottom of the first motor, and the support is connected to the bracket.

[0010] Two parallel side plates are vertically installed above the transportation component and are connected by adjusting bolts. The connecting block straddles the installation base of the fixing block; four groups of precision rotating wheels are symmetrically arranged and are respectively installed on both sides of the fixing block to ensure the stability of the belt operation; enabling the entire rejection component to operate smoothly and achieve efficient and accurate rejection of double-page covers.

[0011] Preferably, a plurality of annular grooves are provided on the plurality of rotating wheels, a rotating shaft is installed between the axes of the two rotating wheels, and the rotating shaft is located inside both ends of the fixing block. The annular grooves are designed to ensure the operation of the rejection belt, and the rotating shaft is used to connect the two rotating wheels, enabling the first motor to drive the two rotating wheels to operate and ensuring the stability of power transmission.

[0012] Preferably, the fixing block is of an annular structure, a plurality of air holes are provided on one side of the bottom and top of the fixing block, an annular air cavity is provided inside the fixing block, and the annular air cavity is communicated with the first air pipe. A negative pressure is formed in the annular air cavity through the first air pump, and an adsorption effect can be formed on the rejection belt to adsorb the double-page covers.

[0013] Preferably, a plurality of through holes are provided on the rejection belt, protrusions are provided on both sides of the inner side of the rejection belt, and the protrusions are matched with the annular grooves. The through holes are used to adsorb the double-page covers and ensure that the covers can be smoothly separated and rejected and enter the collection component, and the cooperation between the protrusions and the annular grooves is used to ensure that the rotating wheels can smoothly drive the rejection belt to operate.

[0014] Preferably, the collection component includes baffles, a bottom plate, a sloping plate, and stoppers; two mutually parallel baffles are installed on the transportation component, the bottom plate is installed between the two baffles, one end of the sloping plate is installed at one end of the bottom plate and is located between the two baffles, and a plurality of the stoppers are installed at the end of the bottom plate away from the sloping plate.

[0015] The platen enables the cover to fall from the rejection belt and slide onto the bottom plate. The baffle can prevent the cover from falling onto the transport belt and interfering with the transport of the covers on the transport belt.

[0016] Preferably, one end of the platen away from the bottom plate is located at one end of the rejection belt and is lower than the top horizontal plane of the rejection belt. This is to ensure that the cover can smoothly fall from the transport belt into the collection assembly and be collected by the collection assembly.

[0017] Preferably, the transport assembly includes a transport belt, a rotating shaft, a rectangular shell, a second air pump, a second air pipe, and a second motor; the two rotating shafts are installed between the two support plates, the transport belt is installed on the two rotating shafts and is located between the support plates, the rectangular shell is installed between the two support plates and is located inside the transport belt, the second air pump is installed on the bracket, and the second air pump and the first air pump are on the same side, one end of the second air pipe is installed on the second air pump, and the other end is communicated with the rectangular shell, the second motor is installed on one side of the support plate, and the second motor and the first motor are on the same side.

[0018] The two rotating shafts are firmly installed between the two support plates. As the core of support and drive, they ensure the stability and continuity of the entire transport process. The transport belt is cleverly installed on these two rotating shafts and is located in the space between the support plates. A second motor is installed on one side of the support plate, and it is on the same side as the first motor. Such a layout not only helps save space but also improves the operating efficiency of the entire system. As the power source, the second motor drives the rotation of the rotating shaft and the transport belt to achieve the transport of the covers.

[0019] Preferably, a plurality of round holes are formed in the transport belt, and a gap is left between the transport belt and the rejection belt. A negative pressure is formed between the round holes and the cover to adsorb the cover, and the gap between the transport belt and the rejection belt is used to ensure that the double-folded covers can pass through and separate the double-folded covers through the transport belt and the rejection belt, so as to ensure the rejection of the double-folded covers.

[0020] Preferably, a plurality of circular holes are formed in the top of the rectangular shell. The circular holes are used to extract the external air, so that a negative pressure is formed above the transport belt and the cover in contact with the transport belt is adsorbed.

[0021] The beneficial effects of the present invention are as follows: 1. The present invention sets a transportation component and a rejection component on a bracket. Through the mutual cooperation of the transportation component and the rejection component, the covers transported with double pages are automatically separated and rejected, ensuring that not all the covers with double pages are rejected, but only the overlapping cover is separated, reducing the subsequent separation cost, saving the rejection time, and greatly improving the rejection efficiency.

[0022] 2. The present invention sets a collection component on the transportation component. The separated covers are automatically collected by the collection component for subsequent transportation of the covers, reducing the subsequent separation cost and time, and improving the rejection efficiency.

[0023] 3. The present invention fixes a block on the rejection component. By setting a plurality of air holes on the block, the separated covers are transported from below the rejection belt to above the rejection belt, and the adsorption force on the covers is reduced as the rejection belt moves, so that the separated covers can smoothly enter the collection component for collection, greatly improving the rejection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Now, the above and other aspects of the present invention will be described only by way of example with reference to the drawings, where: Figure 1 is a three-dimensional structure schematic diagram of the whole of the present invention.

[0026] Figure 2 is a three-dimensional structure schematic diagram of the whole from another perspective of the present invention.

[0027] Figure 3 is a three-dimensional structure schematic diagram of the rejection component of the present invention.

[0028] Figure 4 is a three-dimensional structure schematic diagram of the rejection component of the present invention without the rejection belt.

[0029] Figure 5 is a three-dimensional structure schematic diagram of the runner and the rotating shaft of the present invention.

[0030] Figure 6 is a three-dimensional structure schematic diagram of the collection component of the present invention.

[0031] Figure 7 is a sectional view of the transportation component of the present invention.

[0032] Figure 8 This is a cross-sectional view of the fixed block of the present invention.

[0033] In the figure: 1, bracket; 2, support plate; 3, transportation component; 31, transportation belt; 311, round hole; 32, rotating shaft; 33, rectangular shell; 331, circular hole; 34, second air pump; 35, second air pipe; 36, second motor; 4, rejection component; 41, side plate; 42, connecting block; 43, fixed block; 431, air hole; 432, annular air cavity; 44, runner; 441, annular groove; 442, rotating shaft; 45, rejection belt; 451, through hole; 452, protrusion; 46, first air pump; 47, first air pipe; 48, first motor; 481, support; 5, collection component; 51, baffle; 52, bottom plate; 53, inclined plate; 54, stop block. Detailed implementation mode

[0034] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the specification drawings and specific implementation modes.

[0035] As Figures 1 to 8 shown, the automatic rejection device for the double-page feeding of the binding cover of a bookbinding machine includes: a bracket 1, a support plate 2 and a transportation component 3. Two parallel support plates 2 are installed on both sides of the bracket 1, and a transportation component 3 is installed between the two support plates 2; It further includes a rejection component 4 and a collection component 5. The rejection component 4 is installed on the top of the transportation component 3, the collection component 5 is installed on the top of the transportation component 3, and the collection component 5 is located on one side of the rejection component 4. The rejection component 4 adsorbs the cover on the transportation component 3 through negative pressure and transports the cover to the collection component 5 for collection.

[0036] The bracket 1 and the two parallel support plates 2 are made of high-strength aluminum alloy material, and the surface is treated by anodic oxidation, having excellent rigidity and corrosion resistance. Wear-resistant transportation belt 31: Made of special polyurethane material, with anti-slip patterns on the surface and an array of adsorption holes evenly distributed on the surface. The transportation component 3 transports the cover at a constant speed (adjustable from 0.5 - 2 m / s), and the bottom negative pressure system provides an adsorption force of 5 - 10 kPa to ensure the flat transportation of a single cover. The upper cover is accurately separated and laterally transferred, and the rejected cover enters the collection component 5 along the diversion chute.

[0037] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8As shown, the rejection component 4 includes side plates 41, connecting blocks 42, fixing blocks 43, rotating wheels 44, rejection belts 45, first air pumps 46, first air pipes 47 and first motors 48; Two mutually parallel side plates 41 are installed on the transportation component 3, the connecting block 42 is installed between the two mutually parallel side plates 41, the fixing block 43 is installed on the connecting block 42, and multiple rotating wheels 44 are respectively rotatably installed on both sides of the fixing block 43. The rejection belt 45 is rotatably installed on multiple rotating wheels 44, and the rejection belt 45 is in sliding contact with the fixing block 43. The first air pump 46 is installed on the bracket 1, one end of the first air pipe 47 is installed on the first air pump 46, and the other end is connected to the fixing block 43. The first motor 48 is installed on one side of the side plate 41 and is connected to the rotating wheel 44. A support 481 is provided at the bottom of the first motor 48, and the support 481 is connected to the bracket 1.

[0038] Each component of the rejection component 4 is precisely matched to achieve precise adsorption and rejection of double-page covers. The side plate 41 serves as the main support frame of the rejection component 4 to ensure structural rigidity and stability. The connecting block 42 is horizontally fixed between the two side plates 41 and is locked by high-strength bolts. It provides the installation base for the fixing block 43 and enhances the vibration resistance of the overall structure. The fixing block 43 is fixed on the connecting block 42 and is in sliding contact with the inner surface of the rejection belt 45. An annular vacuum adsorption cavity is provided inside, which is communicated with the first air pump 46 through the first air pipe 47 for generating negative pressure adsorption force. There are 4 rotating wheels 44 (2 on each side), which are respectively rotatably installed on both sides of the fixing block 43. They are used to support and guide the operation of the rejection belt 45 to ensure smooth operation without slipping. The rejection belt 45 is tensioned and sleeved on multiple rotating wheels 44, and is in moderate frictional contact with the surface of the fixing block 43. The surface is designed with micropores to enhance the adsorption effect. The first motor 48 is fixed on the bracket 1 through the support 481.

[0039] As Figure 4 and Figure 8 As shown, the fixing block 43 is of an annular structure. A plurality of air holes 431 are provided on one side of the bottom and top of the fixing block 43. An annular air cavity 432 is provided inside the fixing block 43, and the annular air cavity 432 is communicated with the first air pipe 47.

[0040] The clearance between the fixing block 43 and the rejection belt 45 is controlled within the range of 0.1 - 0.3 mm to avoid excessive friction.

[0041] As Figure 3 As shown, a plurality of through holes 451 are provided on the rejection belt 45. Raised portions 452 are provided on both sides of the inner side of the rejection belt 45, and the raised portions 452 cooperate with the annular grooves 441.

[0042] The rejection belt 45 is designed with a composite structure. A number of precision through holes 451 are evenly distributed on its inner surface in an array, with a hole diameter of 1.2 ± 0.05 mm. A continuous trapezoidal guiding protrusion 452 is provided at the inner edge of the rejection belt 45 and is integrally formed with wear-resistant polyurethane material. The structure of the protrusion 452 cooperates with the annular groove 441 of the fixed block 43, and the cooperation gap is controlled within the range of 0.2 mm to ensure that the runner 44 can drive the operation of the rejection belt 45.

[0043] As Figure 1 , Figure 2 and Figure 6 shown, the collection assembly 5 includes a baffle 51, a bottom plate 52, an inclined plate 53 and a stop block 54. The two mutually parallel baffles 51 are installed on the transportation assembly 3. The bottom plate 52 is installed between the two baffles 51. One end of the inclined plate 53 is installed at one end of the bottom plate 52 and is located between the two baffles 51. A plurality of the stop blocks 54 are installed at the end of the bottom plate 52 away from the inclined plate 53.

[0044] The collection assembly 5 is designed with a modular structure and is mainly composed of a baffle 51, a bottom plate 52, an inclined plate 53 and a stop block 54. The other end of the bottom plate 52 uses a rubber stop block 54 to prevent the cover from slipping, which can effectively block the cover and avoid rebound. Ensure that the rejected covers can be collected orderly and do not shift again.

[0045] As Figure 1 and Figure 2 shown, the side end of the inclined plate 53 away from the bottom plate 52 is located at one end of the rejection belt 45 and is lower than the top horizontal plane of the rejection belt 45. The inclined plate 53 is fixed at one end of the bottom plate 52 at an inclination angle of 35°. The connection between it and the bottom plate 52 adopts an arc transition design to ensure the smooth sliding of the cover, and the inclined plate 53 is lower than the top horizontal plane of the rejection belt 45 to ensure that the cover can fall smoothly.

[0046] As Figure 1 , Figure 2 and Figure 7 shown, the transportation assembly 3 includes a transportation belt 31, a rotating shaft 32, a rectangular shell 33, a second air pump 34, a second air pipe 35 and a second motor 36; the two rotating shafts 32 are installed between the two support plates 2. The transportation belt 31 is installed on the two rotating shafts 32 and is located between the support plates 2. The rectangular shell 33 is installed between the two support plates 2 and is located inside the transportation belt 31. The second air pump 34 is installed on the bracket 1, and the second air pump 34 and the first air pump 46 are on the same side. One end of the second air pipe 35 is installed on the second air pump 34, and the other end is communicated with the rectangular shell 33. The second motor 36 is installed on one side of the support plate 2, and the second motor 36 and the first motor 48 are on the same side.

[0047] The transport component 3 adopts a modular drive design and mainly consists of a transport belt 31, a rotating shaft 32, a rectangular shell 33, a second air pump 34, a second air pipe 35, and a second motor 36. The rectangular shell 33 is made of aluminum alloy and is internally provided with evenly distributed diversion channels, which are connected to the second air pump 34 through the second air pipe 35 to form a vacuum adsorption system. The second motor 36 adopts servo drive technology and is connected to the rotating shaft 32 through synchronous belt drive, and its rotation speed can be accurately regulated. The second air pump 34 and the first air pump 46 are integrally arranged on the same side of the bracket 1, and a shock-absorbing mounting seat is used to reduce the operating noise. The entire transport component 3 realizes speed synchronization with the rejection component 4 through the PLC control system to ensure the continuity and stability of the cover delivery.

[0048] As Figure 7 shown, a plurality of round holes 311 are formed in the transport belt 31, and a gap is left between the transport belt 31 and the rejection belt 45.

[0049] The transport belt 31 adopts an opening design, and a number of precision round hole 311 arrays are evenly distributed on its surface. The hole diameter is 1.5 ± 0.1 mm, and the hole pitch is an equidistant arrangement of 10 mm × 10 mm. A precise gap of 2.0 ± 0.2 mm is maintained between the transport belt 31 and the upper rejection belt 45. This gap design not only ensures the independent operation of the double-belt system but also guarantees the effective separation of the double-page covers. The contact surface between the transport belt 31 and the rejection belt 45 is treated with anti-static to avoid material adhesion. At the same time, the edges of the round holes 311 are chamfered and polished. This collaborative design enables the transport system to form a perfect functional cooperation with the rejection component 4 while maintaining efficient transportation.

[0050] As Figure 7 shown, a plurality of round holes 331 are formed in the top of the rectangular shell 33. And a number of round negative pressure holes with a diameter of 2.0 ± 0.05 mm are evenly distributed on the top surface of the rectangular shell 33, and the hole pitch is a matrix arrangement of 8 mm × 8 mm, which improves the stability and reliability of the cover delivery.

[0051] In the working process of the present invention: First, the cover will be placed on the transport belt 31 of the transport component 3. The second motor 36 drives the rotating shaft 32 to rotate, the rotating shaft 32 drives the transport belt 31 to rotate, and drives the cover to move. At the same time, the second air pump 34 is started, and negative pressure is generated to extract the air in the rectangular shell 33 through the second air pipe 35. A negative pressure will be formed inside the rectangular shell 33, and the cover on the transport belt 31 will be adsorbed.

[0052] When the cover enters below the rejection component 4, the first motor 48 on the rejection component 4 starts, driving the runner 44 and the rotating shaft 442 to rotate together, and at the same time driving the rejection belt 45 to rotate. Meanwhile, the first air pump 46 starts, pumping out the air inside the annular air cavity 432 in the fixed block 43 through the first air pipe 47, and negative pressure will be formed inside the annular air cavity 432.

[0053] When the covers are double - sheeted, the cover in contact with the transport belt 31 will be adsorbed and continue to be transported, while the double - sheeted cover above will be adsorbed by the upper rejection belt 45, thus separating the double - sheeted covers. The separated covers are transported above the fixed block 43 by the rejection belt 45. As the rejection belt 45 rotates, when the separated cover passes through the other end of the fixed block 43, the adsorption force will disappear. As the rejection belt 45 rotates, the separated cover will be transported to the collection component 5 and slide onto the upper part of the bottom plate 52 through the inclined plate 53, thus collecting the separated covers.

[0054] The cover adsorbed by the transport belt 31 will continue to move and enter the next process, thus completing the automatic rejection of double - sheeted covers.

[0055] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Automatic rejection device for double-page feeding of cover of perfect binder, including: A bracket (1), a support plate (2) and a transport component (3), wherein two support plates (2) parallel to each other are mounted on both sides of the bracket (1), and the transport component (3) is mounted between the two support plates (2); The invention is characterized in that it further comprises a rejection component (4) and a collection component (5), wherein the rejection component (4) is mounted on the top of the transport component (3), and the collection component (5) is mounted on the top of the transport component (3), and the collection component (5) is located on one side of the rejection component (4), and the rejection component (4) absorbs the cover on the transport component (3) through negative pressure, and transports the cover to the collection component (5) for collection.

2. The automatic rejection device for double-page feeding of cover sheets of a perfect binding machine according to claim 1 is characterized in that: The rejection assembly (4) comprises a side plate (41), a connecting block (42), a fixing block (43), a rotating wheel (44), a rejection belt (45), a first air pump (46), a first air pipe (47) and a first motor (48); two mutually parallel side plates (41) are mounted on the transport assembly (3), the connecting block (42) is mounted between the two mutually parallel side plates (41), the fixing block (43) is mounted on the connecting block (42), a plurality of rotating wheels (44) are rotatably mounted on both sides of the fixing block (43), and the rejection belt (45) is mounted on the first motor (48). (45) is rotatably mounted on the plurality of rotating wheels (44), and the rejecting belt (45) is in sliding contact with the fixed block (43), the first air pump (46) is mounted on the bracket (1), one end of the first air pipe (47) is mounted on the first air pump (46), and the other end is connected to the fixed block (43), the first motor (48) is mounted on one side of the side plate (41) and is connected to the rotating wheel (44), a support (481) is provided at the bottom of the first motor (48), and the support (481) is connected to the bracket (1).

3. The automatic rejection device for double-page feeding of cover sheets of a perfect binding machine according to claim 2 is characterized in that: An annular groove (441) is formed on the plurality of rotating wheels (44), a rotating shaft (442) is installed between the axes of two rotating wheels (44), and the rotating shaft (442) is located on the inner sides of both ends of the fixed block (43).

4. The automatic rejection device for double-page feeding of cover sheets of a perfect binding machine according to claim 2 is characterized in that: The fixing block (43) is an annular structure, a plurality of air holes (431) are provided at the bottom and one end of the top of the fixing block (43), an annular air cavity (432) is provided inside the fixing block (43), and the annular air cavity (432) is communicated with the first air pipe (47).

5. The automatic rejection device for double-page feeding of cover sheets of a perfect binding machine according to claim 3 is characterized in that: The rejecting belt (45) is provided with a plurality of through holes (451), and protrusions (452) are provided on both sides of the inner side of the rejecting belt (45), and the protrusions (452) cooperate with the annular groove (441).

6. The automatic rejection device for double-page feeding of cover sheets of a perfect binding machine according to claim 1 is characterized in that: The collecting assembly (5) comprises a baffle (51), a bottom plate (52), an inclined plate (53) and a stopper (54); two mutually parallel baffles (51) are mounted on the transport assembly (3); the bottom plate (52) is mounted between the two baffles (51); one side end of the inclined plate (53) is mounted on one end of the bottom plate (52) and is located between the two baffles (51); and a plurality of the stoppers (54) are mounted on one end of the bottom plate (52) away from the inclined plate (53).

7. The automatic rejection device for double-page feeding of cover sheets of a perfect binding machine according to claim 6 is characterized in that: One side end of the inclined plate (53) away from the bottom plate (52) is located at one end of the rejection belt (45) and is lower than the top horizontal plane of the rejection belt (45).

8. The automatic rejection device for double-page feeding of cover sheets of a perfect binding machine according to claim 1 is characterized in that: The transport assembly (3) comprises a transport belt (31), a rotating shaft (32), a rectangular shell (33), a second air pump (34), a second air pipe (35) and a second motor (36); the two rotating shafts (32) are mounted between the two support plates (2); the transport belt (31) is mounted on the two rotating shafts (32) and is located between the support plates (2); the rectangular shell (33) is mounted between the two support plates (2) and is located inside the transport belt (31); the second air pump (34) is mounted on the bracket (1), and the second air pump (34) and the first air pump (46) are located on the same side; one end of the second air pipe (35) is mounted on the second air pump (34), and the other end is connected to the rectangular shell (33); the second motor (36) is mounted on one side of the support plate (2), and the second motor (36) and the first motor (48) are located on the same side.

9. The automatic rejection device for double-page feeding of cover sheets of a perfect binding machine according to claim 8 is characterized in that: The transport belt (31) is provided with a plurality of circular holes (311), and a gap is left between the transport belt (31) and the rejecting belt (45).

10. The automatic rejection device for double-page feeding of cover sheets of a perfect binding machine according to claim 8, characterized in that: A plurality of circular holes (331) are formed on the top of the rectangular shell (33).

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