A cover machine

Abstract

The present invention discloses a cover machine, comprising a face paper conveying component, a gluing component, a gray board conveying component and a cover pasting component, wherein the cover pasting component comprises a front conveying roller, a rear conveying roller and a brush roller arranged between the front and rear conveying rollers, and the brush roller is driven by an independent motor control, and is characterized in that a conveying belt is arranged in the middle of the equipment, the conveying belt performs intermittent conveying action when working, a vacuum suction hole is arranged on the surface of the conveying belt, the face paper conveying component and the gluing component are arranged on the front paper side of the conveying belt, the cover pasting component is arranged on the rear paper discharge side of the conveying belt, and the gray board conveying component conveys the gray board to the conveying belt to be pasted with the face paper when working. The present invention has a simple structure, improves production speed, and better guarantees cover quality.

Description

Technical Field

[0001] The invention relates to a covering machine for automatically covering a gray board. Background Art

[0002] The cover machine is used for the production of cover and edge wrapping of gray board. When working, the face paper is pasted on the front of the gray board, and the periphery of the face paper wraps the gray board around. In January 2020, the inventor applied for an invention patent with patent number 2020100313675 and patent name "Cover edge wrapping device", which solved the technical problems of high efficiency of cover edge wrapping and no need to adjust the specifications for gray boards of different sizes. However, the above patent is only for the cover edge wrapping component of the cover machine. The cover machine also has face paper conveying components, gluing components, gray board conveying components, etc. How to make them form a simple and compact combination is the first thing that this application needs to consider. Secondly, in the cover machine of the prior art, the paper conveying component generally uses a feeder to convey paper. When the paper conveying component is used to separate the paper into upper and lower sheets, in order to ensure reliable separation, it is necessary to blow air strongly between the upper and lower sheets of paper, which easily leads to inaccurate paper feeding by the feeder and affects the improvement of production speed. Inaccurate paper feeding by the feeder is the biggest factor affecting the quality of the cover; in addition, the paper cannot be effectively corrected when it is sent to be coated with glue, so that the gray board and the paper cannot be well aligned, which also affects the quality of the cover; in addition, after the front and rear ends of the paper are hemmed on the gray board, the left and right ends of the paper are also hemmed on the gray board. Since the hemming paper at the corners of the gray board cannot be effectively pressed and shaped after the front and rear hemming, when the left and right hemming is performed, the hemming paper at the corners that has not been pressed and shaped will have corner wrinkles and looseness, affecting the quality of the cover; in addition, when the gray board conveying component is in motion, the action of sending the gray board out of the gray board stacking and positioning frame and sending the gray board to fit with the paper needs to be driven by two sets of power mechanisms respectively to complete. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a cover machine which has a simple structure, improves production speed and better guarantees cover quality.

[0004] The present invention is accomplished by taking the following technical solutions:

[0005] A cover machine comprises a face paper conveying component, a gluing component, a gray board conveying component and a cover pasting component. The cover pasting component comprises a front conveying roller, a rear conveying roller and a brush roller arranged between the front and rear conveying rollers. The brush roller is driven by an independent motor. The invention is characterized in that a conveying belt is arranged in the middle of the equipment. The conveying belt performs intermittent conveying action when working. Vacuum suction holes are arranged on the surface of the conveying belt. The face paper conveying component and the gluing component are arranged on the paper forwarding side of the conveying belt. The cover pasting component is arranged on the paper rear discharging side of the conveying belt. When the gray board conveying component is working, the gray board is conveyed to the conveying belt to be pasted with the face paper.

[0006] The facial paper conveying component includes a facial paper stacking and positioning frame and a front suction nozzle and a rear suction nozzle arranged above the facial paper stacking and positioning frame. The facial paper stacking and positioning frame moves up and down. When the rear suction nozzle is working, it sucks and releases the front part of the facial paper and feeds the paper. When the front suction nozzle is working, it only sucks and releases the back part of the facial paper.

[0007] The front suction nozzle is movably arranged on the rear support, and the movement of the front suction nozzle is driven by the suction nozzle cylinder. A paper pressing block is movably arranged on the front side of the front suction nozzle, and the paper pressing block is obliquely movably arranged on the rear support, and the oblique movement of the paper pressing block is driven by the paper pressing cylinder. A face paper separation blowing device is arranged on the side of the paper pressing block.

[0008] The rear suction nozzles are arranged in a row on the horizontal plate, the horizontal plate can be flipped and arranged on the swing arm, the flipping of the horizontal plate is driven by the horizontal plate cylinder, the swing arm is set to swing back and forth, and the swinging of the swing arm is driven by the swing arm cylinder. A front separation blow for the face paper is arranged under the rear suction nozzle.

[0009] The facial paper conveying component also includes a paper feeding roller and a paper pressing roller for receiving the facial paper from the rear suction nozzle. The paper feeding roller is rotatably arranged on the frame wall panel, the paper feeding roller is driven by power, and the paper pressing roller is arranged above the paper feeding roller. A plurality of rubber rings are arranged side by side on the surface of the paper pressing roller. The shaft end of the paper pressing roller is rotatably connected to the supporting sleeve, and the bottom of the supporting sleeve is supported by a supporting plate. The supporting plate is pushed up and down by the supporting plate cylinder. An adjusting shaft is provided at the outer end of the supporting sleeve, and the adjusting shaft is rotatably arranged on the frame wall panel. The opposite end faces of the adjusting shaft and the supporting sleeve are provided with linear grooves and linear protrusions, and the linear grooves and the linear protrusions form a sliding fit with each other.

[0010] The grey board conveying component comprises a grey board stacking and positioning frame, a grey board bracket is extended from the front end of the grey board stacking and positioning frame, a paper pushing block is arranged below the grey board stacking and positioning frame, a grey board suction nozzle is arranged above the grey board bracket, the grey board suction nozzle can move up and down and is arranged on a movable bracket, the movable bracket is arranged to move forward and backward, and the paper pushing block moves forward and backward together with the movable bracket.

[0011] The forward and backward movement of the mobile bracket is driven by a servo motor. A rack is fixedly installed on the mobile bracket, and a gear is installed on the motor shaft of the servo motor. The gear is meshed with the rack.

[0012] The paper pushing block is connected to the flip plate, and its top is higher than the flip plate. The flip plate is supported by front and rear shaft rods. The front shaft rod makes the flip plate flip around it, and the rear shaft rod makes the flip plate get a flip limit position. The two ends of the front and rear shaft rods are fixed on the moving bracket.

[0013] On the paper feeding side of the front conveying roller and the paper discharging side of the rear conveying roller, the left and right ends are respectively provided with a front corner pressing device and a rear corner pressing device for pressing and shaping the corners of the cover.

[0014] The front angle pressing device and the rear angle pressing device have the same structure, including an angle pressing seat and upper and lower rollers arranged on the angle pressing seat. The angle pressing seat is arranged to be movable left and right, and the angle pressing seat is pushed by an angle pressing cylinder.

[0015] The cover machine of the above technical solution has a simple and compact structure, improves production speed, and better guarantees cover quality. The specific working process is: facial paper is stacked up and down and placed in a facial paper stacking positioning frame, and the gray board is stacked up and down and placed in a gray board stacking positioning frame. When the cover is working, the front suction nozzle is first moved to suck and lift the rear part of the top facial paper in the facial paper stacking positioning frame, and at the same time, the rear separation blowing is performed to blow air to separate the rear end of the facial paper into upper and lower sheets. After the rear end of the facial paper is separated into upper and lower sheets, the paper pressing block is inserted obliquely to press the facial paper below. During this period, the rear suction nozzle will also move to suck and lift the front part of the top facial paper in the facial paper stacking positioning frame, and at the same time, the front separation blowing is performed to separate the front end of the facial paper into upper and lower sheets. The above actions are completed. After completion, the front suction nozzle releases the facial paper, and the rear suction nozzle performs paper feeding action to send the facial paper to the paper feeding roller (the paper pressing roller is in a raised state at this time); in the above-mentioned action process, the front and rear suction nozzles work together to ensure not only the reliable separation of the upper and lower papers, but also the accuracy of paper feeding and the improvement of production speed; when the front end of the facial paper enters between the paper feeding roller and the paper pressing roller, the support plate moves downward, the paper pressing roller moves downward and contacts the paper feeding roller, and as the paper feeding roller rotates, the facial paper is sent to the bottom of the gluing component, the gluing roller glues the facial paper and sends the facial paper to the conveyor belt, and the vacuum suction holes on the surface of the conveyor belt suck the facial paper with negative pressure, so that the facial paper is reliably positioned on the conveyor belt; next, as the conveyor belt is intermittently conveyed, when the facial paper reaches the middle of the conveyor belt When the gray board is in the intermediate position, the gray board conveying component sends the gray board to the conveying belt and fits it with the facial paper on the conveying belt. After fitting, the conveying belt continues to convey the facial paper to send the facial paper and the gray board to the cover edge pasting component; in the cover edge pasting component, the front and rear conveying rollers first convey the gray board and the facial paper backwards, then under the action of the brush roller, the front end of the facial paper performs front edge wrapping on the gray board, and the rear angle pressing device that reaches the angle pressing position presses and shapes the edge wrapping facial paper at the corner of the gray board that has been wrapped at the front, then the front and rear conveying rollers move in opposite directions, and the gray board and the facial paper retreat, and under the action of the brush roller, the rear end of the facial paper performs rear edge wrapping on the gray board, and then the front angle pressing device reaches the angle pressing position to press and shape the edge wrapping facial paper at the corner of the gray board that has been wrapped at the rear, and the above movements are completed. After the operation, the front and rear conveying rollers perform reverse action again, and the gray board and face paper are sent out of the front of the cover pasting component. Next, the gray board and face paper are conveyed to the left or right into the rear of the cover pasting component to wrap the left and right ends of the face paper against the left and right ends of the gray board, and finally the cover pasting production of the gray board is completed; because the face paper at the corners of the gray board has been effectively pressed and shaped before the left and right hemming and after the front and back hemming, there will be no wrinkles or loose corners during the left and right hemming, thereby ensuring the quality of the cover; when the above-mentioned gray board conveying component is in action, the actions of sending the gray board out of the gray board stacking positioning frame and sending the gray board to fit with the face paper can be completed by the drive of only one servo motor, and the structure is simpler, and the conveying distances of the two are guaranteed to be absolutely the same.In addition, during the paper feeding roller and the paper pressing roller conveying the facial paper, the multiple rubber rings on the paper pressing roller can adapt to facial papers of various sizes. The facial paper with the smallest area will always have the rubber ring to press the facial paper to ensure reliable paper feeding. Therefore, there is no need to adjust the spacing of the paper pressing roller as in the prior art, thereby reducing unnecessary operations and having a simple structure. In addition, the plugging direction of the linear groove and the linear protrusion can be changed by simply rotating the adjustment shaft. Since the paper pressing roller relies on gravity to contact the roller surface with the paper feeding roller during operation, as the plugging direction changes, the axis of the paper pressing roller will also be slightly misaligned in the front and rear directions relative to the paper feeding roller, thereby playing a role in correcting the deviation of the facial paper conveying. The structure is simple, so that the facial paper can be well aligned with the gray board when it is glued, thereby ensuring the quality of the cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention has the following accompanying drawings:

[0017] Figure 1 is a three-dimensional structural diagram of the present invention,

[0018] Figure 2 for Figure 1 The right side view,

[0019] Figure 3 for Figure 1 A longitudinal cross-sectional view of

[0020] Figure 4 It is a structural diagram of the tissue paper conveying component.

[0021] Figure 5 for Figure 4 A partial enlarged view of

[0022] Figure 6 for Figure 5 The separate installation structure diagram of the center front nozzle,

[0023] Figure 7 for Figure 6 Bottom view of

[0024] Figure 8 for Figure 5 Separate installation structure diagram of the paper feed roller and the paper pressing roller.

[0025] Fig. 9 This is a schematic diagram of the structure of the ash board conveying components.

[0026] Fig.10 for Figure 1 Enlarged structural diagram of the middle front pressure angle device. DETAILED DESCRIPTION

[0027] like Figure 1-3As shown in Figure 10, a cover machine of the present invention comprises a face paper conveying component 1, a gluing component 2, a gray board conveying component 7 and a cover edge bonding component, the gluing component comprises a gluing roller 14, a gluing pressure roller 12 is provided on one side of the gluing roller 14, and a scraping plate 15 is provided on the other side, a glue groove 13 is surrounded by the upper space where the gluing roller 14 and the gluing pressure roller 12 are in contact, a conveying belt 3 is arranged in the middle of the cover machine, the conveying belt performs intermittent conveying action when working, and a vacuum suction hole is arranged on the surface of the conveying belt 3, the face paper conveying component 1 and the gluing component 2 are arranged on the forward paper side of the conveying belt 3, the cover edge bonding component is arranged on the rear paper discharge side of the conveying belt 3, the cover edge bonding component is composed of a front part 5 and a rear part 6, the front part 5 is used for the front and rear edge binding of the gray board, and the rear part 6 is used for the left and right edge binding of the gray board, and the front and rear parts have a front conveying roller 16 and a rear conveying roller 18 with the same structure and are arranged at the front and rear The brush roller 17 in the middle of the conveying roller is driven by an independent motor; at the front part 5 of the cover pasting component, the paper feeding side of the front conveying roller 16 and the paper discharging side of the rear conveying roller 18, the left and right ends are respectively provided with a front angle pressing device 4 and a rear angle pressing device 19 for pressing and shaping the corners of the cover pasting. The front angle pressing device 4 and the rear angle pressing device 19 have the same structure, including an angle pressing seat 22 and an upper roller 21 and a lower roller 23 arranged on the angle pressing seat 22. The distance between the upper roller 21 and the lower roller 23 is equal to the thickness of the gray board. The angle pressing seat 22 is arranged to be movable left and right. The angle pressing seat 22 is pushed to the working position by the angle pressing cylinder 20 and reset to leave the working position by the spring 24; the gray board conveying component 7 is arranged above the front part 5 of the cover pasting component. When the gray board conveying component 7 is working, it sends the gray board to the conveying belt 3 to fit with the surface paper.

[0028] like Figure 4-8As shown, the tissue paper conveying component includes a tissue paper stacking and positioning frame 8 and a front suction nozzle 35 and a rear suction nozzle 9 arranged above the tissue paper stacking and positioning frame. The tissue paper stacking and positioning frame 8 is driven by a lifting servo motor to perform up and down lifting movements. When the rear suction nozzle 9 is working, it sucks and releases the front part of the tissue paper and feeds the paper. When the front suction nozzle 35 is working, it only sucks and releases the rear part of the tissue paper. The specific structure is: the front suction nozzle 35 is connected to the suction nozzle seat 41, the suction nozzle seat 41 is connected to the flip shaft 40, the flip shaft 40 can be rotatably arranged on the rear support 32, the rear support 32 is fixedly installed, the middle of the flip shaft 40 is connected to the flip block 42, the flip block 42 is connected to the push rod of the suction nozzle cylinder 44, the suction nozzle cylinder 44 is installed on the rear support 32, when the suction nozzle cylinder 44 works, it will push the front suction nozzle 35 to suck and release the paper at the rear of the opposite paper, the front side of the front suction nozzle 35 is provided with a paper pressing block 43, the paper pressing block 43 can be obliquely movably arranged on the rear support 32, the paper pressing block 43 is connected to the push rod of the paper pressing cylinder 33, the paper pressing cylinder 33 is installed on the rear support 32, when the paper pressing cylinder 33 works, it will push the paper pressing block 4 3 performs a paper pressing action, and a face paper rear separation blowing air 34 is arranged beside the paper pressing block 43; the rear suction nozzles 9 are arranged in a row on the horizontal plate 30, and the horizontal plate 30 can be turned over on the swing arm 25 through the rotating shaft 29. The rotating shaft 29 is connected to the turning arm 28, and the turning arm 28 is connected to the push rod of the horizontal plate cylinder 26. The horizontal plate cylinder 26 is installed on the swing arm 25. When the horizontal plate cylinder 26 works, it will push the horizontal plate 30 to turn over, so that the rear suction nozzle 9 produces a paper suction and release action on the front part of the face paper. The swing arm 25 is set to swing forward and backward. The swing of the swing arm 25 is driven by the swing arm cylinder 27. Through the swing of the swing arm 25, the rear suction nozzle 9 can produce a paper feeding action in the front and rear directions. A face paper front separation blowing air 36 is arranged below the rear suction nozzle 9.

[0029] The facial paper conveying component also includes a paper feeding roller 10 and a paper pressing roller 11 for receiving the facial paper delivered by the rear suction nozzle 9. The paper feeding roller 10 is rotatably arranged on the frame wall panel. The paper feeding roller 10 is driven by a motor. The paper pressing roller 11 is arranged above the paper feeding roller 10. A plurality of rubber rings 31 are arranged side by side on the surface of the paper pressing roller 11. The shaft end of the paper pressing roller 11 is rotatably connected to the supporting sleeve 37. The bottom of the supporting sleeve 37 is supported by a supporting plate 47. The supporting plate 47 is pushed by a supporting plate cylinder 48 to swing up and down. An adjusting shaft 38 is provided at the outer end of the supporting sleeve 37. The adjusting shaft 38 is rotatably arranged on the frame wall panel. A lever handle 39 is provided on the outer circle of the adjusting shaft 38. A linear groove 45 and a linear protrusion 46 are provided on the opposite end faces of the adjusting shaft 38 and the supporting sleeve 37. The linear groove 45 is located on the supporting sleeve 37, and the linear protrusion 46 is located on the adjusting shaft 38. The linear groove 45 and the linear protrusion 46 form a sliding fit with each other.

[0030] like Fig. 9As shown, the gray board conveying component 7 includes a fixedly installed gray board stacking and positioning frame 53, a gray board bracket 56 is extended from the front end of the gray board stacking and positioning frame 53, a paper pushing block 52 is provided below the gray board stacking and positioning frame 53, and a gray board suction nozzle 57 is provided above the gray board bracket 56. The gray board suction nozzle 57 is installed on a suction nozzle frame 55, and the suction nozzle frame 55 can move up and down on a movable bracket 60. The up and down movement of the suction nozzle frame 55 is driven by a linear module 54, and the movable bracket 60 is set to move forward and backward. The forward and backward movement of the movable bracket 60 is driven by a servo motor 59 is driven, a rack 61 is fixedly installed on the mobile bracket 60, a gear 58 is installed on the motor shaft of the servo motor 59, and the gear 58 is in transmission meshing with the rack 61; the paper pushing block 52 moves forward and backward together with the mobile bracket 60, the paper pushing block 52 is connected to the flip plate 51, and its top is higher than the flip plate, the flip plate 51 is supported by the front and rear shaft rods, the front shaft rod 50 makes the flip plate 51 flip around it, and the rear shaft rod 49 makes the flip plate 51 get a flip limit, and the two ends of the front shaft rod 50 and the rear shaft rod 49 are fixed on the mobile bracket 60. The working process of the gray board conveying component is: the servo motor 59 works to make the movable bracket 60 move forward. When the movable bracket 60 moves forward, the paper pushing block 52 will push the gray board at the bottom of the gray board stacking positioning frame 53 forward to the gray board bracket 56 and be supported by the gray board bracket 56. At the same time, the gray board originally in the gray board bracket 56 is sucked by the gray board suction nozzle 57 and sent to the center of the conveyor belt 3 to be fitted with the surface paper. When the movable bracket 60 moves backward, the top of the paper pushing block 52 will hit the gray board in the gray board stacking positioning frame 53, so the paper pushing block 52 will flip over, so that the paper pushing block 52 can return to the original paper pushing position from the bottom of the gray board, waiting for the next gray board pushing action.

[0031] The above-mentioned cover machine works as follows: the facial papers are stacked up and down and placed in the facial paper stacking positioning frame 8, and the gray board is stacked up and down and placed in the gray board stacking positioning frame 53. When the cover is working, the front suction nozzle 35 is first actuated to suck and lift the rear part of the top facial paper in the facial paper stacking positioning frame 8, and at the same time, the rear separation blower 34 blows air to separate the rear end of the facial paper up and down. After the rear end of the facial paper is separated up and down, the paper pressing block 43 is inserted obliquely to press the facial paper below. During this period, the rear suction nozzle 9 will also act to suck and lift the front part of the top facial paper in the facial paper stacking positioning frame 8, and at the same time, the front separation blower 34 blows air to separate the rear end of the facial paper up and down. 36 blows air to separate the front end of the facial paper into sheets up and down; after the above actions are completed, the front suction nozzle 35 releases the facial paper, and the rear suction nozzle 9 sucks the facial paper alone to feed the paper, and sends the facial paper to the paper feeding roller 10 (at this time, the paper pressing roller 11 is in a raised state). When the front end of the facial paper enters between the paper feeding roller 10 and the paper pressing roller 11, the support plate 47 moves downward, and the paper pressing roller 11 moves downward to contact the paper feeding roller 10. As the paper feeding roller 10 rotates, the facial paper is sent to the bottom of the gluing component, and the gluing roller 14 applies glue to the facial paper and sends the facial paper to the conveyor belt 3 under the scraping action of the scraping plate 15. The vacuum suction holes on the surface of the conveyor belt 3 suck the facial paper. Negative pressure is applied to hold the facial paper in a secure position on the conveyor belt 3; next, with the intermittent conveyance of the conveyor belt 3, when the facial paper reaches the middle position of the conveyor belt, the gray board conveying component 7 delivers the gray board to the conveyor belt to be laminated with the facial paper on the conveyor belt. After laminating, the conveyor belt 3 continues to convey the facial paper to deliver the facial paper and the gray board to the cover pasting component; at the front part 5 of the cover pasting component, the front conveying roller 16 and the rear conveying roller 18 first convey the gray board and the facial paper backwards, so that under the action of the brush roller 17, the front end of the facial paper wraps the gray board forward, and the rear angle pressing device 19 that reaches the angle pressing position wraps the front edge of the facial paper The wrapping paper at the corners of the gray board is pressed and shaped, then the front and rear conveying rollers move in the opposite direction, the gray board and the paper move backward, and under the action of the brush roller, the rear end of the paper wraps the gray board, then the front angle pressing device 4 reaches the angle pressing position, and the wrapping paper at the corners of the gray board is pressed and shaped; after completing the above actions, the front and rear conveying rollers move in the opposite direction again, the gray board and the paper are sent out of the front part 5 of the cover edge pasting component, then the gray board and the paper are transported to the right into the rear part 6 of the cover edge pasting component, and the left and right ends of the paper wrap the left and right ends of the gray board, and finally the cover edge pasting production of the gray board is completed. In the above process, the adjusting shaft 38 can be rotated by turning the turning handle 39, so that the axis of the paper pressing roller 11 is slightly offset in the front and rear directions relative to the paper feeding roller 10, which plays a role in correcting the paper conveying, so that the paper can be well aligned with the gray board when it is glued, and the cover quality is guaranteed.

Claims

1. A cover machine, comprising a face paper conveying component, a gluing component, a gray board conveying component and a cover pasting component, wherein the cover pasting component comprises a front conveying roller, a rear conveying roller and a brush roller arranged between the front and rear conveying rollers, and the brush roller is driven by an independent motor, characterized in that: A conveyor belt is arranged in the middle of the equipment. When the conveyor belt is working, it performs intermittent conveying action. There are vacuum suction holes on the surface of the conveyor belt. The facial paper conveying component and the gluing component are arranged on the front paper side of the conveyor belt. The cover pasting component is arranged on the rear paper discharge side of the conveyor belt. When the gray board conveying component is working, the gray board is sent to the conveyor belt to fit with the facial paper; the facial paper conveying component includes a facial paper stacking positioning frame and a front suction nozzle and a rear suction nozzle arranged above the facial paper stacking positioning frame. The facial paper stacking positioning frame performs up and down lifting action. When the rear suction nozzle is working, it sucks and releases the front part of the facial paper and feeds the paper. When the front suction nozzle is working, it only sucks and releases the rear part of the facial paper; the facial paper conveying component also includes a paper feeding roller and a paper pressing roller for receiving the facial paper sent out by the rear suction nozzle. The paper feed roller is rotatably arranged on the frame wall panel, the paper feed roller is driven by power, the paper pressing roller is arranged above the paper feed roller, and a plurality of rubber rings are arranged side by side on the surface of the paper pressing roller. The shaft end of the paper pressing roller is rotatably connected to the supporting sleeve, the bottom of the supporting sleeve is supported by the supporting plate, and the supporting plate is pushed up and down by the supporting plate cylinder. An adjusting shaft is arranged on the outer end of the supporting sleeve, and the adjusting shaft is rotatably arranged on the frame wall panel. The opposite end faces of the adjusting shaft and the supporting sleeve are provided with linear grooves and linear protrusions, and the linear grooves and the linear protrusions form a sliding fit with each other; on the paper feed side of the front conveying roller and the paper discharge side of the rear conveying roller, the left and right ends are respectively provided with a front angle pressing device and a rear angle pressing device for pressing and shaping the corners of the cover edge.

2. A cover machine as claimed in claim 1, characterized in that: The front suction nozzle is movably arranged on the rear support, and the movement of the front suction nozzle is driven by the suction nozzle cylinder. A paper pressing block is movably arranged on the front side of the front suction nozzle, and the paper pressing block is obliquely movably arranged on the rear support, and the oblique movement of the paper pressing block is driven by the paper pressing cylinder. A face paper separation blowing device is arranged on the side of the paper pressing block.

3. A cover machine as claimed in claim 1, characterized in that: The rear suction nozzles are arranged in a row on the horizontal plate, the horizontal plate can be flipped and arranged on the swing arm, the flipping of the horizontal plate is driven by the horizontal plate cylinder, the swing arm is set to swing back and forth, and the swinging of the swing arm is driven by the swing arm cylinder. A front separation blow for the face paper is arranged under the rear suction nozzle.

4. A cover machine as claimed in claim 1, characterized in that: The grey board conveying component comprises a grey board stacking and positioning frame, a grey board bracket is extended from the front end of the grey board stacking and positioning frame, a paper pushing block is arranged below the grey board stacking and positioning frame, a grey board suction nozzle is arranged above the grey board bracket, the grey board suction nozzle can move up and down and is arranged on a movable bracket, the movable bracket is arranged to move forward and backward, and the paper pushing block moves forward and backward together with the movable bracket.

5. A cover machine as claimed in claim 4, characterized in that: The forward and backward movement of the mobile bracket is driven by a servo motor. A rack is fixedly installed on the mobile bracket, and a gear is installed on the motor shaft of the servo motor. The gear is meshed with the rack.

6. A cover machine as claimed in claim 4, characterized in that: The paper pushing block is connected to the flip plate, and its top is higher than the flip plate. The flip plate is supported by front and rear shaft rods. The front shaft rod makes the flip plate flip around it, and the rear shaft rod makes the flip plate get a flip limit position. The two ends of the front and rear shaft rods are fixed on the moving bracket.

7. A cover machine as claimed in claim 1, characterized in that: The front angle pressing device and the rear angle pressing device have the same structure, including an angle pressing seat and upper and lower rollers arranged on the angle pressing seat. The angle pressing seat is arranged to be movable left and right, and the angle pressing seat is pushed by an angle pressing cylinder.

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