Paper pre-feeding scratch-resistant paper feeding feeder mechanism

Abstract

The utility model discloses a paper pre-feeding scratch-resistant paper feeding feeder mechanism which comprises two installation side plates arranged at intervals, a blowing and sucking air roller assembly, a suction nozzle height adjusting assembly and a blowing nozzle assembly are arranged between the two installation side plates, the suction nozzle height adjusting assembly can adjust the height position of a suction nozzle, and the blowing nozzle assembly can adjust the height position of the suction nozzle. Wherein one mounting side plate is fixedly provided with a blowing and sucking roller driving mechanism, a front feeding wheel driving mechanism and a front feeding wheel, the front feeding wheel is located below the front feeding wheel driving mechanism, the front feeding wheel driving mechanism drives the front feeding wheel, and the blowing and sucking roller driving mechanism drives the blowing and sucking roller assembly to switch air sucking and blowing. Adsorption type paper feeding is adopted, and the problem that paperboards are scratched in the paper separating and feeding process can be solved. According to the utility model, the paper transfer suction nozzle is replaced by the front feeding wheel with the paper suction function, and the front feeding wheel rotates by one circle to finish the suction conveying of one paperboard, so that the time difference of the reciprocating motion of the paper transfer suction nozzle can be reduced, and the paper feeding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of paper feeders, in particular to a pre-paper feeding and scratch-proof paper feeder mechanism. Background Art

[0002] The continuous paper feed mechanism in a printing press is also known as a paper feeder. Its function is to periodically separate sheets from the stack and deliver them to the feed rollers. The feeder head must operate accurately and flawlessly, preventing double, multiple, or empty sheets. The paper separation process involves the following: the paper presser lifts, the paper separation nozzle moves downward, grabs a sheet, and then moves upward. The paper presser drops, pressing the remaining sheets below while air is blown. The paper delivery nozzle moves backward to a predetermined position, where it joins the paper separation nozzle in grabbing the sheet. The paper separation nozzle then releases the sheet, and the paper delivery nozzle independently grasps the sheet and moves forward to deliver it to the feed rollers. However, existing paper separation nozzles and paper delivery nozzles are separate mechanisms. The paper delivery nozzle requires a separate mechanism to control its movement and feed. This creates a time lag in the nozzle's reciprocating motion, which reduces paper feeding speed. Summary of the Invention

[0003] To overcome the shortcomings and deficiencies of the prior art, the present invention aims to provide a scratch-resistant pre-feed feeder mechanism. This mechanism utilizes suction-type paper feeding, preventing scratches on paperboard during the paper separation and feeding process. The feeder replaces the paper delivery nozzle with a front feed wheel with a suction function. Each rotation of the front feed wheel completes the suction and delivery of a single sheet of paperboard, reducing the time difference between the nozzle's reciprocating motion and improving paper feeding efficiency.

[0004] The purpose of the utility model is achieved through the following technical solutions: a pre-paper feeding anti-scratch paper feeding mechanism, comprising two spaced-apart mounting side panels, a blowing and suction roller assembly, a suction nozzle height adjustment assembly, and a blowing nozzle assembly are provided between the two mounting side panels, the suction nozzle height adjustment assembly can adjust the height position of the suction nozzle, and a blowing and suction roller drive mechanism, a front feed wheel drive mechanism and a front feed wheel are fixedly installed on one of the mounting side panels, the front feed wheel is located below the front feed wheel drive mechanism, the front feed wheel drive mechanism drives the front feed wheel, and the blowing and suction roller drive mechanism drives the blowing and suction roller assembly to switch suction and blowing.

[0005] As an improvement of the pre-paper feeding and anti-scratch paper feeding feeder mechanism of the present invention, a valve mounting seat and a knob mounting seat are further provided between the two mounting side panels, the valve mounting seat is located on one side of the blowing and suction roller assembly, and the knob mounting seat is located below the valve mounting seat, and an air guide plate is provided at the bottom of the knob mounting seat, and the two ends of the air guide plate are respectively fixedly mounted on the two mounting side panels.

[0006] As an improvement of the pre-feeding anti-scratch paper feeder mechanism of the utility model, one of the mounting side panels is provided with a synchronous wheel mounting plate, the front feed wheel drive mechanism includes a front feed wheel servo drive, a first active synchronous pulley and a first driven synchronous pulley, the first active synchronous pulley and the first driven synchronous pulley are linked by a first synchronous belt, the first active synchronous pulley is connected to the output shaft of the front feed wheel servo drive, and the first driven synchronous pulley is mounted on the synchronous wheel mounting plate;

[0007] An air pipe connecting seat is also provided on the synchronous wheel mounting plate, and the air pipe connecting seat is located below the first driven synchronous pulley. The air pipe connecting seat is connected with the valve mounting seat and the front feed wheel through a pipeline. A plurality of adsorption holes are provided at intervals on the front feed wheel, and a connecting hole is provided on the side of the front feed wheel corresponding to the position of each adsorption hole. The air pipe connecting seat is connected with the connecting hole. Negative pressure suction is achieved every time the adsorption hole on the front feed wheel rotates to connect with the air pipe connecting seat. Every time the front feed wheel rotates one circle, it sucks in air and takes away a piece of cardboard and transports the cardboard forward.

[0008] As an improvement of the pre-paper feeding and anti-scratch paper feeding feeder mechanism of the utility model, the blowing and suction roller drive mechanism includes a roller servo drive, a second active synchronous pulley and a second driven synchronous pulley, the second active synchronous pulley and the second driven synchronous pulley are linked by a synchronous belt, the second active synchronous pulley is connected to the output shaft of the roller servo drive, and the second driven synchronous pulley is connected to the blowing and suction roller assembly, and the roller servo drive can control the blowing and suction roller assembly to switch between blowing and suction and exhaust.

[0009] As an improvement of the pre-paper feeding anti-scratch paper feeding feeder mechanism of the utility model, the blowing and suction roller assembly includes an outer sleeve, an intermediate sleeve and an inner switching roller, the inner switching roller is inserted into the intermediate sleeve, the intermediate sleeve is arranged in the outer sleeve, the two ends of the outer sleeve are respectively fixedly mounted on the two mounting side plates, the intermediate sleeve is provided with four air holes, two exhaust holes, one blowing hole and one suction hole, the outer sleeve is provided with through holes corresponding to the positions of the four air holes, two exhaust holes, one blowing hole and one suction hole, the valve mounting seat is provided with four valve mounting holes, each of the valve mounting holes is provided with a valve, the bottom of each valve mounting hole is provided with a connecting hole, and each valve mounting hole corresponds to one through hole.

[0010] As an improvement of the pre-feeding anti-scratch paper feeding feeder mechanism of the utility model, two air ducts are provided in the knob mounting seat, and the two air ducts are respectively connected to a connecting hole in the valve mounting hole. A connecting pipe is provided in the air guide plate, and the connecting pipe is connected to the two air ducts and the blowing nozzle assembly.

[0011] As an improvement of the pre-paper feeding and anti-scratch paper feeding flyer mechanism of the utility model, a first annular groove and a second annular groove are provided on the inner switching roller, a first exhaust groove is provided on one side wall of the first annular groove, and an air intake groove is provided on the other side wall, a second exhaust groove is provided on one side wall of the second annular groove, and an air suction groove is provided on the other side wall, when the air intake groove is rotated to correspond to the blowing hole, two of the air holes realize air intake, when the first exhaust groove and the second exhaust groove correspond to the exhaust holes, exhaust is realized, when the air suction groove corresponds to the air suction hole, the other two air holes realize air suction.

[0012] As an improvement of the pre-paper-feeding and anti-scratch paper feeding feeder mechanism of the utility model, the suction nozzle height adjustment component includes a knob, a transmission screw and an L-shaped pendulum block, the L-shaped pendulum block is movably mounted on the two mounting side plates through an axle rod, one end of the transmission screw is passed through the knob mounting seat and is screwed to the knob, the suction nozzle is movably connected to one end of the L-shaped pendulum block through an axle pin, and the other end of the L-shaped pendulum block is movably connected to the other end of the transmission screw through an axle pin. Rotating the knob can push the L-shaped pendulum block to swing, and the swing of the L-shaped pendulum block drives the suction nozzle to adjust its height position up and down.

[0013] As an improvement to the present invention's pre-feed, scratch-resistant paper feeder mechanism, the air blowing nozzle assembly includes side and center air blowing nozzles. The side air blowing nozzles are connected to the air guide plate via side mounting brackets and side connecting pipes, while the center air blowing nozzles are connected to the air guide plate via center mounting brackets and pipes. When the suction nozzle lifts the cardboard, both the side and center air blowing nozzles blow air horizontally to the bottom of the cardboard, causing it to float. After the cardboard floats, the front feed wheel picks up the cardboard through suction and transports it forward as it rotates.

[0014] As an improvement of the pre-paper-feeding and anti-scratch paper feeding mechanism of the utility model, the side mounting seat includes a base and an upper adjustment plate, the upper adjustment plate is provided with a long screw hole and a pipe connecting seat, the side blowing nozzle is connected to the pipe connecting seat, the pipe connecting seat is connected to the air guide plate through a first pipe, the long screw hole is penetrated by a screw, the screw is threadedly connected to the base, an adjustment pipe seat is provided on the air guide plate, the first pipe is penetrated by the adjustment pipe seat, a height adjustment nut is threadedly connected to the outside of the adjustment pipe seat, the side of the adjustment pipe seat is provided with a notch, and the height position of the side blowing nozzle can be adjusted by rotating the height adjustment nut.

[0015] The beneficial effect of the present invention is that it adopts suction-type paper feeding, which can prevent the problem of cardboard being scratched during the paper separation and feeding process. The present invention replaces the paper feeding nozzle with a front feeding wheel with a paper suction function. Each rotation of the front feeding wheel can complete the suction and feeding of a piece of cardboard, which can reduce the time difference of the reciprocating movement of the paper feeding nozzle and improve paper feeding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front perspective view of the present utility model;

[0017] Figure 2 It is a reverse perspective view of the present utility model;

[0018] Figure 3 It is a side view of the utility model;

[0019] Figure 4 It is a schematic diagram of the internal structure of the utility model;

[0020] Figure 5 This is a schematic diagram of one direction of the internal switching roller of the utility model;

[0021] Figure 6 This is another schematic diagram of the inner switching roller of the utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the knob mounting base of the utility model;

[0023] 1. Mounting plate 2. Air blowing and suction roller assembly 3. Suction nozzle height adjustment assembly 4. Air blowing nozzle assembly 5. Suction nozzle height adjustment assembly 6. Suction nozzle 7. Air blowing and suction roller drive mechanism 8. Front feed wheel drive mechanism 9. Front feed wheel 10. Valve mounting seat 11. Knob mounting seat 12. Air guide plate 13. Synchronous wheel mounting plate 14. Air pipe connecting seat 21. Outer sleeve 22. Intermediate sleeve 23. Inner switching roller 24. Air hole 25. Exhaust hole 26. Air blowing hole 27. Air suction hole 28. Through hole 71. Roller servo drive 72. Second active synchronous pulley 73. Second driven synchronous pulley 74. Synchronous belt 81. Front feed wheel servo drive 82. First main Driving synchronous pulley, 83, first driven synchronous pulley, 84, first synchronous belt, 91, adsorption hole, 92, connecting hole, 101, valve mounting hole, 102, connecting hole, 111, air duct, 231, first annular through groove, 232, second annular through groove, 233, first exhaust groove, 234, air intake groove, 235, second exhaust groove, 236, air intake groove, 51, knob, 52, transmission screw, 53, L-shaped pendulum block, 41, side air blowing nozzle, 42, middle air blowing nozzle, 43, side mounting seat, 431, base, 432, upper adjustment plate, 433, long screw hole, 434, first pipe, 435, screw, 436, pipe connecting seat, 121, adjustment pipe seat, 122, height adjustment nut. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0027] like Figure 1-Figure 7 As shown, a pre-feeding anti-scratch paper feeding feeder mechanism includes two spaced-apart mounting side panels 1, a blowing and suction roller assembly 2, a suction nozzle height adjustment assembly 3, and a blowing nozzle assembly 4 are provided between the two mounting side panels 1, and the suction nozzle height adjustment assembly 5 can adjust the height position of the suction nozzle 6. A blowing and suction roller drive mechanism 7, a front feed wheel drive mechanism 8, and a front feed wheel 9 are fixedly mounted on one of the mounting side panels 1. The front feed wheel 9 is located below the front feed wheel drive mechanism 8. The front feed wheel drive mechanism 8 drives the front feed wheel 9, and the blowing and suction roller drive mechanism 7 drives the blowing and suction roller assembly 2 to switch between suction and blowing.

[0028] Preferably, a valve mounting seat 10 and a knob mounting seat 11 are further provided between the two mounting side panels 1. The valve mounting seat 10 is located on one side of the blowing and suction roller assembly 2, and the knob mounting seat 11 is located below the valve mounting seat 10. An air guide plate 12 is provided at the bottom of the knob mounting seat 11, and both ends of the air guide plate 12 are respectively fixedly mounted on the two mounting side panels 1.

[0029] Preferably, a synchronous wheel mounting plate 13 is provided on one of the mounting side plates 1, and the forward wheel driving mechanism 8 includes a forward wheel servo drive 81, a first active synchronous pulley 82, and a first driven synchronous pulley 83. The first active synchronous pulley 82 and the first driven synchronous pulley 83 are linked by a first synchronous belt 84. The first active synchronous pulley 82 is connected to the output shaft of the forward wheel servo drive 81, and the first driven synchronous pulley 83 is mounted on the synchronous wheel mounting plate 13.

[0030] An air pipe connecting seat 14 is also provided on the synchronous wheel mounting plate 13. The air pipe connecting seat 14 is located below the first driven synchronous pulley 83. The air pipe connecting seat 14 is connected to the valve mounting seat 10 and the front feed wheel 9 through a pipeline. A plurality of adsorption holes 91 are provided at intervals on the front feed wheel 9. A connecting hole 92 is provided on the side of the front feed wheel 9 corresponding to the position of each adsorption hole 91. The air pipe connecting seat 14 is connected to the connecting hole 92. Every time the adsorption hole 91 on the front feed wheel 9 rotates to connect with the air pipe connecting seat 14, negative pressure suction is realized. Every time the front feed wheel 9 rotates one circle, it sucks in air and takes away a piece of cardboard and transports the cardboard forward.

[0031] Preferably, the blowing and suction roller drive mechanism 7 includes a roller servo drive 71, a second active synchronous pulley 72 and a second driven synchronous pulley 73. The second active synchronous pulley 72 and the second driven synchronous pulley 73 are linked by a synchronous belt 74. The second active synchronous pulley 72 is connected to the output shaft of the roller servo drive 71, and the second driven synchronous pulley 73 is connected to the blowing and suction roller assembly 2. The roller servo drive 71 can control the blowing and suction roller assembly 2 to switch between blowing and suction and exhaust.

[0032] Preferably, the blowing and suction roller assembly 2 includes an outer sleeve 21, an intermediate sleeve 22 and an inner switching roller 23, the inner switching roller 23 is inserted into the intermediate sleeve 22, the intermediate sleeve 22 is arranged in the outer sleeve 21, and the two ends of the outer sleeve 21 are respectively fixedly mounted on the two mounting side plates 1, and the intermediate sleeve 22 is provided with four air holes 24, two exhaust holes 25, one blowing hole 26 and one suction hole 27, and the outer sleeve 21 is provided with through holes 28 at the positions corresponding to the four air holes 24, two exhaust holes 25, one blowing hole 26 and one suction hole 27, and the valve mounting seat 10 is provided with four valve mounting holes 101, each valve mounting hole 101 is provided with a valve, and the bottom of the four valve mounting holes 101 is provided with a connecting hole 102, and the four valve mounting holes 101 correspond to the four through holes 28 respectively.

[0033] Preferably, two air passages 111 are provided in the knob mounting seat 11 , and the two air passages 11 are respectively connected to a connecting hole 102 in a valve mounting hole 101 . A connecting pipe is provided in the air guide plate 12 , and the connecting pipe is connected to the two air passages 111 and the blowing nozzle assembly 4 .

[0034] Preferably, a first annular groove 231 and a second annular groove 232 are provided on the inner switching roller 23, a first exhaust groove 233 is provided on one side wall of the first annular groove 231, and an air intake groove 234 is provided on the other side wall, a second exhaust groove 235 is provided on one side wall of the second annular groove 232, and an air suction groove 236 is provided on the other side wall, when the air suction groove 234 is rotated to correspond to the blowing hole 26, the two air holes 24 connected with the blowing nozzle assembly 4 realize air intake, when the first exhaust groove 233 and the second exhaust groove 235 correspond to the exhaust hole 25, exhaust is realized, when the air suction groove 236 corresponds to the air suction hole 27, the other two air holes 24 connected with the blowing nozzle assembly 4 and the front feeding wheel realize air suction.

[0035] Preferably, the suction nozzle height adjustment assembly 5 includes a knob 51, a transmission screw 52 and an L-shaped pendulum block 53. The L-shaped pendulum block 53 is movably mounted on the two mounting side plates 1 through an axis rod. One end of the transmission screw 52 is passed through the knob mounting seat 11 and is screwed to the knob 51. The suction nozzle 6 is movably connected to one end of the L-shaped pendulum block 53 through an axis pin, and the other end of the L-shaped pendulum block 53 is movably connected to the other end of the transmission screw 52 through an axis pin. Turning the knob 51 can push the L-shaped pendulum block 53 to swing, and the swing of the L-shaped pendulum block 53 drives the suction nozzle 6 to adjust the height position up and down.

[0036] Preferably, the air blowing nozzle assembly 4 includes a side air blowing nozzle 41 and a center air blowing nozzle 42. The side air blowing nozzle 41 is connected to the air guide plate 12 via a side mounting seat 43 and a side connecting pipe. The center air blowing nozzle 42 is connected to the air guide plate 12 via a center mounting seat 44 and a pipe. When the suction nozzle 6 sucks up the cardboard, the side air blowing nozzle 41 and the center air blowing nozzle 42 both blow air horizontally to the bottom of the cardboard to float it. After the cardboard floats, the front feeding wheel 9 picks up the cardboard by suction and transports it forward during rotation.

[0037] Preferably, the side mounting seat 43 includes a base 431 and an upper adjustment plate 432, the upper adjustment plate 432 is provided with a long screw hole 433 and a pipe connecting seat 436, the side blowing nozzle 41 is connected to the pipe connecting seat 436, the pipe connecting seat 436 is connected to the air guide plate 12 through the first pipe 434, the long screw hole 433 is passed through a screw 435, the screw 435 is screwed to the base 431, an adjustment pipe seat 121 is provided on the air guide plate 12, the first pipe 434 is passed through the adjustment pipe seat 121, and a height adjustment nut 122 is screwed to the outside of the adjustment pipe seat 121, and a notch is provided on the side of the adjustment pipe seat 121. Rotating the height adjustment nut 122 can adjust the height position of the side blowing nozzle 41.

[0038] Although the 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 variations may be made to these embodiments without departing from the principles and structure of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pre-feeding anti-scratch paper feeder mechanism, comprising two spaced-apart mounting side plates, characterized in that: A blowing and suction roller assembly, a suction nozzle height adjustment assembly, and a blowing nozzle assembly are provided between the two mounting side panels. The suction nozzle height adjustment assembly can adjust the height position of the suction nozzle. A blowing and suction roller drive mechanism, a front feed wheel drive mechanism, and a front feed wheel are fixedly installed on one of the mounting side panels. The front feed wheel is located below the front feed wheel drive mechanism. The front feed wheel drive mechanism drives the front feed wheel, and the blowing and suction roller drive mechanism drives the blowing and suction roller assembly to switch suction and blowing.

2. The pre-feeding anti-scratch paper feeding mechanism according to claim 1, characterized in that: A valve mounting seat and a knob mounting seat are also provided between the two mounting side panels. The valve mounting seat is located on one side of the blowing and suction roller assembly, and the knob mounting seat is located below the valve mounting seat. An air guide plate is provided at the bottom of the knob mounting seat, and both ends of the air guide plate are respectively fixedly mounted on the two mounting side panels.

3. The pre-feeding anti-scratch paper feeding mechanism according to claim 2, characterized in that: One of the mounting side plates is provided with a synchronous wheel mounting plate, the forward wheel driving mechanism includes a forward wheel servo drive, a first active synchronous pulley and a first driven synchronous pulley, the first active synchronous pulley and the first driven synchronous pulley are linked by a first synchronous belt, the first active synchronous pulley is connected to the output shaft of the forward wheel servo drive, and the first driven synchronous pulley is mounted on the synchronous wheel mounting plate; An air pipe connecting seat is also provided on the synchronous wheel mounting plate, and the air pipe connecting seat is located below the first driven synchronous pulley. The air pipe connecting seat is connected with the valve mounting seat and the front feed wheel through a pipeline. A plurality of adsorption holes are provided at intervals on the front feed wheel, and a connecting hole is provided on the side of the front feed wheel corresponding to the position of each adsorption hole. The air pipe connecting seat is connected with the connecting hole. Negative pressure suction is achieved every time the adsorption hole on the front feed wheel rotates to connect with the air pipe connecting seat. Every time the front feed wheel rotates one circle, it sucks in air and takes away a piece of cardboard and transports the cardboard forward.

4. The pre-feeding anti-scratch paper feeding mechanism according to claim 1, characterized in that: The blowing and suction roller drive mechanism includes a roller servo drive, a second active synchronous pulley and a second driven synchronous pulley. The second active synchronous pulley and the second driven synchronous pulley are linked by a synchronous belt. The second active synchronous pulley is connected to the output shaft of the roller servo drive, and the second driven synchronous pulley is connected to the blowing and suction roller assembly. The roller servo drive can control the blowing and suction roller assembly to switch between blowing and suction and exhaust.

5. The pre-feeding anti-scratch paper feeding mechanism according to claim 2, characterized in that: The blowing and suction roller assembly includes an outer sleeve, an intermediate sleeve and an inner switching roller. The inner switching roller is inserted into the intermediate sleeve. The intermediate sleeve is arranged in the outer sleeve. The two ends of the outer sleeve are respectively fixedly mounted on the two mounting side plates. The intermediate sleeve is provided with four air holes, two exhaust holes, one blowing hole and one suction hole. The outer sleeve is provided with through holes corresponding to the positions of the four air holes, two exhaust holes, one blowing hole and one suction hole. The valve mounting seat is provided with four valve mounting holes. A valve is provided in each valve mounting hole. A connecting hole is provided at the bottom of each valve mounting hole. Each valve mounting hole corresponds to one through hole.

6. The pre-feeding anti-scratch paper feeding mechanism according to claim 5, characterized in that: Two air passages are provided in the knob mounting seat, and the two air passages are respectively communicated with a connecting hole in the valve mounting hole. A connecting pipe is provided in the air guide plate, and the connecting pipe is communicated with the two air passages and the blowing nozzle assembly.

7. The pre-feeding anti-scratch paper feeding mechanism according to claim 6, characterized in that: The inner switching roller is provided with a first annular groove and a second annular groove, a first exhaust groove is provided on one side wall of the first annular groove, and an air intake groove is provided on the other side wall, a second exhaust groove is provided on one side wall of the second annular groove, and an air suction groove is provided on the other side wall, when the air intake groove is rotated to correspond to the blowing hole, two of the air holes realize air intake, when the first exhaust groove and the second exhaust groove correspond to the exhaust holes, exhaust is realized, when the air suction groove corresponds to the air suction hole, the other two air holes realize air suction.

8. The pre-feeding and scratch-proof paper feeding mechanism according to claim 2, characterized in that: The suction nozzle height adjustment assembly includes a knob, a transmission screw and an L-shaped pendulum block. The L-shaped pendulum block is movably mounted on the two mounting side plates through an axle rod. One end of the transmission screw is passed through the knob mounting seat and is screwed to the knob. The suction nozzle is movably connected to one end of the L-shaped pendulum block through an axle pin, and the other end of the L-shaped pendulum block is movably connected to the other end of the transmission screw through an axle pin. Turning the knob can push the L-shaped pendulum block to swing, and the swing of the L-shaped pendulum block drives the suction nozzle to adjust its height position up and down.

9. The pre-feeding anti-scratch paper feeding mechanism according to claim 2, characterized in that: The air blowing nozzle assembly includes a side air blowing nozzle and a middle air blowing nozzle. The side air blowing nozzle is connected to the air guide plate through a side mounting seat and a side connecting pipe. The middle air blowing nozzle is connected to the air guide plate through a middle mounting seat and a pipe. When the suction nozzle sucks up the cardboard, the side air blowing nozzle and the middle air blowing nozzle both blow air horizontally to the bottom of the cardboard to make the cardboard float.

10. The pre-feeding anti-scratch paper feeding mechanism according to claim 9, characterized in that: The side mounting seat includes a base and an upper adjustment plate, the upper adjustment plate is provided with a long screw hole and a pipe connecting seat, the side blowing nozzle is connected to the pipe connecting seat, the pipe connecting seat is connected to the air guide plate through a first pipe, the long screw hole is penetrated by a screw, the screw is threadedly connected to the base, an adjustment pipe seat is provided on the air guide plate, the first pipe is penetrated by the adjustment pipe seat, a height adjustment nut is threadedly connected to the outside of the adjustment pipe seat, a notch is provided on the side of the adjustment pipe seat, and the height position of the side blowing nozzle can be adjusted by rotating the height adjustment nut.

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