A paper conveying device between a sheet-fed printing press and a folder

Abstract

The present application discloses a paper conveying device between a sheet-fed printing press and a folding machine, which includes a first-stage belt conveyor, a second-stage belt conveyor and a paper supporting part installed on a frame. The first-stage belt conveyor and the second-stage belt conveyor share a common roller. A paper guiding part is arranged above the common roller. The paper guiding part includes a paper guiding cylinder installed on the frame and a paper guiding board fixed on the paper guiding cylinder. There is a paper guiding slit between the paper guiding cylinder and the first conveyor belt. A limiting part is arranged at one end of the second-stage belt conveyor far from the common roller. The paper supporting part includes a lifting device installed on the frame and a paper supporting piece installed on the lifting device. Driven by the lifting device, the paper supporting piece can reciprocate vertically to lift the paper upward, pull out one end of the paper from under the paper guiding board and press it against the upper surface of the paper guiding board. By using the present application, the automatic conveyance of paper from the sheet-fed printing press to the folding machine can be completed, improving the operation efficiency.

Description

Technical Field

[0001] The present invention relates to a paper conveying device between a sheet-fed printing press and a folding machine. Background Art

[0002] For the convenience of packaging, after printing is completed, some papers need to be folded. At present, both the printing and folding of papers have achieved mechanized automatic operations. However, when transferring the printed papers to the folding machine, it still needs to be completely carried out manually, and the operation efficiency cannot be effectively improved. Summary of the Invention

[0003] In order to improve the operation efficiency, the present invention provides a paper conveying device between a sheet-fed printing press and a folding machine, which includes a first-stage belt conveyor, a second-stage belt conveyor and a paper supporting part installed on a frame. The first-stage belt conveyor has a plurality of first conveyor belts arranged at intervals, and the second-stage belt conveyor has a plurality of second conveyor belts arranged at intervals;

[0004] The first paper outlet end of the first-stage belt conveyor and the second paper inlet end of the second-stage belt conveyor share a common roller. The first-stage belt conveyor and the second-stage belt conveyor are connected together along a first axis direction through the common roller; the first paper inlet end of the first-stage belt conveyor is used to receive the papers transferred from the sheet-fed printing press, and the second paper outlet end of the second-stage belt conveyor is directly opposite to the paper inlet of the folding machine; the first paper inlet end is located at one end of the first-stage belt conveyor far from the second-stage belt conveyor and faces away from the second-stage belt conveyor along the first axis, and the second paper outlet end is located at one end of the second-stage belt conveyor far from the first-stage belt conveyor and on one side of the second axis direction of the second-stage belt conveyor; both the first axis and the second axis extend horizontally and are perpendicular to each other;

[0005] A paper guiding part is arranged above the common roller. The paper guiding part includes a paper guiding cylinder rotatably installed on the frame and a paper guiding plate fixedly installed on the paper guiding cylinder. The paper guiding plate extends from the paper guiding cylinder towards the second paper outlet end. There is a paper guiding slit for the paper to pass through between the paper guiding cylinder and the first conveyor belt; a limiting part is arranged at one end of the second-stage belt conveyor far from the common roller, and the limiting part is used to block the papers on the second-stage belt conveyor from continuing to move along the first axis direction;

[0006] The paper supporting part includes a lifting device installed on the frame and a paper supporting member installed on the lifting device. Under the drive of the lifting device, the paper supporting member can move back and forth in the vertical direction; when one end of the paper on the secondary belt conveyor abuts against the limiter, the end of the paper away from the limiter is located under the paper guide. When the paper supporting member moves back and forth in the vertical direction, the paper can be lifted upward, and the end of the paper away from the limiter is pulled out from under the paper guide and pressed against the upper surface of the paper guide. In the present application, the width of the paper guide gap is controlled at 2-6mm, and the width of the paper guide gap is the distance between the paper guide tube and the first conveyor belt.

[0007] When the present application is working, after the printed paper is discharged from the paper outlet of the flat-sheet printing press, it enters the first-level belt conveyor, and is driven by the first conveyor belt to move toward the direction of the secondary belt conveyor, and moves to the secondary belt conveyor through the paper guide gap between the paper guide roller and the first conveyor belt. When the end of the paper facing the limiter abuts against the limiter, the movement is stopped, and the end of the paper facing away from the limiter is still pressed under the paper guide paper. The lifting device is started to move the paper supporting member upward. When the upper surface of the paper supporting member exceeds the upper surface of the second upper side portion of the second conveyor belt, the paper is lifted upward so that the end of the paper pressed under the paper guide paper is pulled out from under the paper guide paper, and then the paper supporting member is moved downward so that the paper is completely spread on the second conveyor belt and the end of the paper facing away from the limiter is pressed on the paper guide paper.

[0008] The second sheet of paper moved from the primary belt conveyor is located below the previous sheet of paper when it passes through the paper guide slit and enters the secondary belt conveyor, so that the next sheet of paper is always located below the previous sheet of paper on the secondary belt conveyor. When working continuously, the paper holding capacity of the secondary belt conveyor generally does not exceed 10 sheets, and the paper on the secondary belt conveyor is preferably kept at a holding capacity of 2-4 sheets of paper. The paper feed roller of the folding machine moves the paper on the secondary belt conveyor to the folding machine for folding.

[0009] By utilizing the present application, the paper can be automatically transferred from a sheet-fed printing press to a folding machine without manual transfer, thereby effectively improving the operating efficiency.

[0010] Specifically, when viewed in the vertical direction, the paper support is located in the gap between two adjacent second conveyor belts. When the paper support moves upward in the vertical direction, the upper surface of the paper support can exceed the upper surface of the second upper side portion of the second conveyor belt; when the paper support moves downward in the vertical direction, the upper surface of the paper support can exceed the upper surface of the second upper side portion of the second conveyor belt. By using the gap between the two second conveyor belts as a channel for the paper support to move up and down, not only can the paper be lifted and lowered smoothly, but the paper support can also be conveniently maintained and replaced.

[0011] Specifically, in order to smoothly transfer the paper transmitted from the sheet-fed printing press to the primary belt conveyor, a paper receiving roller is rotatably installed just above the first front roller of the first paper feeding end of the primary belt conveyor. In the present application, the paper receiving roller is a passive wheel, which can rotate under the drive of the paper. There is a gap of 2-8 mm between the paper receiving roller and the first transmission belt, so that the paper transmitted from the sheet-fed printing press can be smoothly transferred to the primary belt conveyor.

[0012] Furthermore, in order to facilitate receiving the paper delivered from the sheet-fed printing press, the primary belt conveyor is tilted, and the primary belt conveyor is tilted upward from the common roller and extends away from the secondary belt conveyor; the secondary belt conveyor is horizontally arranged. After the primary belt conveyor is tilted, it can be connected with the paper outlet of the sheet-fed printing press from the oblique bottom, and does not interfere with other parts of the sheet-fed printing press. Specifically, the angle between the primary belt conveyor and the horizontal plane is 10-20°.

[0013] Furthermore, in order to prevent the paper guide cylinder from rotating randomly, the paper guide is located on the side of the paper guide cylinder facing the sheet-fed printing press, which affects the smooth entry of the paper into the paper guide slit. The paper guide cylinder is rotatably mounted on the frame via the paper guide shaft, and a torsion spring is movably sleeved on the paper guide shaft. One end of the torsion spring is fixed on the frame, and the other end of the torsion spring presses against the upper surface of the paper guide or is fixed on the paper guide cylinder. The torsion spring can push the paper guide to rotate downward and press against the second conveyor belt. By using the torsion spring, the paper guide is always located on the side of the paper guide cylinder away from the sheet-fed printing press and presses against the first conveyor belt or the second conveyor belt. When the paper enters the paper guide slit, the paper guide is pushed by the paper to rotate upward and press against the paper. When the paper is pulled out from under the paper guide under the push of the paper support, the paper guide can also be pushed by the torsion spring to return to its original position and will not rotate to the side of the paper guide cylinder facing the sheet-fed printing press.

[0014] Further, to prevent the paper drawn out from the paper guiding slit from pressing down on the paper guiding cylinder, the end of the paper near the paper guiding cylinder is always supported on the paper guiding cylinder, forming an obvious upward flanging, which affects the entry of the paper into the folding machine. A virtual plane passes through the central axis of the common roller in the vertical direction, and the paper guiding cylinder of the paper guiding part is located on the side of the virtual plane facing the first paper feeding end. The paper guiding plate is in the shape of a wedge extending with its small end towards the second paper discharging end; when observed in the vertical direction, when one end of the paper on the secondary belt conveyor abuts against the limiting member, the overlapping length between the end of the paper away from the limiting member and the paper guiding plate is 10 - 60 mm. Preferably, the overlapping length between the end of the paper away from the limiting member and the paper guiding plate is 10 - 25 mm. The thickness of the part of the paper guiding plate exceeding the virtual plane towards the second paper discharging end is controlled between 0.3 - 1.2 mm, and on the basis of ensuring the strength of the paper guiding plate, the flatness of the paper on the second conveyor belt is avoided as much as possible.

[0015] Since the central axis of the common roller is located within this virtual plane, the paper guiding cylinder is completely located above the primary belt conveyor. When one end of the paper abuts against the limiting member, the other end of the paper is located on the side of the virtual plane facing the limiting member, so that the paper is completely laid on the secondary belt conveyor.

[0016] Specifically, the limiting member is located at one end of the second upper side part of the secondary belt conveyor away from the common roller; the limiting member is in the shape of a flat plate extending along the second axis direction, and the side surface of the limiting member facing the primary belt conveyor is in the shape of a plane perpendicular to the first axis direction. This design enables the end face of the paper to abut evenly against the limiting member, avoiding excessive local stress and deformation, and at the same time enabling the paper to be completely located on the second upper side part of the secondary belt conveyor, so that the paper can be laid flat on the second conveyor belt.

[0017] Further, a negative pressure paper feeding wheel is provided on the secondary belt conveyor. The negative pressure paper feeding wheel is located between the upper side part and the lower side part of the second conveyor belt. The negative pressure paper feeding wheel is rotatably mounted on the frame through a hollow shaft. A paper feeding motor is fixedly mounted on the frame. The output shaft of the paper feeding motor is connected to one end of the hollow shaft. A rotary joint is provided at the other end of the hollow shaft, and the rotary joint is used to connect to a negative pressure device; negative pressure holes communicating with the inner cavity of the hollow shaft are provided on the negative pressure paper feeding wheel, and the negative pressure holes penetrate through the outer peripheral surface of the negative pressure paper feeding wheel in the radial direction; in the horizontal direction, the hollow shaft is located between the paper supporting part and the limiting member. The negative pressure generated in the negative pressure holes is -0.3 - 4 kPa. This design can enable the paper to be stably held on the secondary belt conveyor. During the production process, when the paper supporting part lifts the paper upward, due to the adsorption effect of the negative pressure paper feeding wheel, the paper can be stably held on the second conveyor belt, avoiding the end of the paper facing the limiting member from being bent due to the lifting of the paper supporting part, which affects the flatness of the paper on the second conveyor belt. There is no specific requirement for the negative pressure generated by the negative pressure holes, as long as the paper can be stably held on the second conveyor belt and does not affect the subsequent insertion of the paper.

[0018] Further, in order to enable the subsequent paper to be smoothly inserted under the previous paper, a paper guiding wheel is rotatably provided on the upper side of the primary belt conveyor. There is a slit for the paper to pass through between the paper guiding wheel and the upper surface of the upper side part of the first conveyor belt. The width of the slit between the paper guiding wheel and the upper surface of the upper side part of the first conveyor belt is preferably 2 - 5 mm. When the subsequent paper passes through the paper guiding part and is inserted under the previous paper, the subsequent paper will be subjected to the resistance generated by the paper guiding part and the previous paper, which hinders the movement of the subsequent paper and may cause the subsequent paper on the first conveyor belt to have an upward arc bend. By using the limiting effect of the paper guiding wheel, even if the subsequent paper on the first conveyor belt has a downward arc bend, due to the limiting effect of the paper guiding wheel, the continuous expansion of the arc bend can be avoided, enabling the paper to reach the second conveyor belt smoothly under the drive of the first conveyor belt. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of an embodiment of the application combined with a sheet-fed printing press and a folding machine.

[0020] Figure 2 is Figure 1 the top view of

[0021] Figure 3 is a schematic structural diagram of the paper conveying device.

[0022] Figure 4 is Figure 3 the top view of

[0023] Figure 5 isFigure 3 Enlarged view of part A

[0024] Figure 6 is Figure 3 Enlarged view of part B

[0025] Figure 7 is Figure 3 View in the direction of C - C Detailed implementation mode

[0026] Refer to Figures 1 - 7 In the attached drawings, the direction of the first axis X indicates the first axis direction, and the direction of the second axis Y indicates the second axis direction. Both the first axis direction and the second axis direction extend along the horizontal direction and are perpendicular to each other.

[0027] A paper conveying device 200 between a flat - sheet printing machine 100 and a folder 500. The paper conveying device 200 includes a first - stage belt conveyor 10, a second - stage belt conveyor 20, and a paper supporting part 40 installed on a frame 60. The first - stage belt conveyor 10 includes a first front roller 11 and a common roller 12, and a plurality of first conveyor belts 13 are wound around the first front roller 11 and the common roller 12. The second - stage belt conveyor 20 includes a second rear roller 22 and the common roller 12, and a plurality of second conveyor belts 23 are wound around the second rear roller 22 and the common roller 12. That is, the common roller 12 belongs to both the first - stage belt conveyor 10 and the second - stage belt conveyor 20 at the same time. A driving motor 121 is installed on the frame, and the output shaft of the driving motor is connected to the rotating shaft of the common roller to drive the first - stage belt conveyor 10 and the second - stage belt conveyor 20 to rotate synchronously.

[0028] One end of the first - stage belt conveyor 10 far from the second - stage belt conveyor 20 forms a first paper - feeding end 101, and one end of the first - stage belt conveyor 10 facing the second - stage belt conveyor 20 forms a first paper - discharging end 102, and the first paper - feeding end 101 faces away from the second - stage belt conveyor along the first axis.

[0029] One end of the second - stage belt conveyor 20 facing the first - stage belt conveyor 10 forms a second paper - feeding end 201, and one end of the second - stage belt conveyor 20 far from the first - stage belt conveyor 10 forms a second paper - discharging end 202, and the second paper - discharging end 202 is located on one side of the second axis direction of the second - stage belt conveyor.

[0030] Since the first - stage belt conveyor 10 and the second - stage belt conveyor 20 share the same common roller, the first conveyor belts 13 and the second conveyor belts 23 wound around the common roller are arranged at intervals. The first - stage belt conveyor and the second - stage belt conveyor are connected together along the first axis direction through the common roller.

[0031] The first paper feeding end of the first belt conveyor is used to receive the paper 800 transferred from the sheet-fed printing press. The second paper discharging end of the second belt conveyor faces the paper feeding port of the folder. Since the first belt conveyor and the second belt conveyor share the same common roller, the paper on the first belt conveyor can be smoothly transferred to the second belt conveyor.

[0032] In this application, for convenience of description, the part of the first conveyor belt 13 located above the first front roller 11 and the common roller 12 is called the first upper part 131, and the part of the first conveyor belt 13 located below the first front roller 11 and the common roller 12 is called the first lower part 132. The part of the second conveyor belt 23 located above the second rear roller 22 and the common roller 12 is called the second upper part 231, and the part of the second conveyor belt 23 located below the second rear roller 22 and the common roller 12 is called the second lower part 232.

[0033] The first belt conveyor is inclined. Specifically, the first belt conveyor extends upward obliquely from the common roller in a direction away from the second belt conveyor. Specifically, in this embodiment, the included angle α between the first belt conveyor and the horizontal plane 103 is 15°. It can be understood that in other embodiments, the included angle α can also be 10°, 12°, 14°, 16°, 18° or 20°, and of course, it can also be other angles between 10 - 20°. The second belt conveyor is horizontally arranged.

[0034] Along the first axis direction, the sheet-fed printing press 100 is located at one end of the first belt conveyor away from the second belt conveyor; along the second axis direction, the folder is located on one side of the second belt conveyor away from the first belt conveyor, and the paper feeding platform of the folder 500 is inserted between the second upper part 231 and the second lower part 232 of the second belt conveyor, and the paper feeding friction wheel 510 of the folder is located above the edge part of the second paper discharging end of the second belt conveyor 20. It can be understood that in another embodiment, the paper feeding platform of the folder can also be directly removed, and the paper feeding friction wheel 510 of the folder is located above the edge part of the second paper discharging end of the second belt conveyor 20.

[0035] Above the first front roller 11, a paper receiving shaft 141 is rotatably mounted. The paper receiving shaft 141 is rotatably mounted on the frame through bearings. Corresponding to each first conveyor belt, a paper receiving roller 14 is fixedly mounted on the paper receiving shaft 141. There is a gap for the paper to pass between the paper receiving roller 14 and the first conveyor belt. The paper transferred from the sheet-fed printing press 100 enters the first-stage belt conveyor through the gap between the paper guiding roller 15 and the first conveyor belt and moves towards the second-stage belt conveyor. That is, a paper receiving roller is provided directly above the roller at the first paper feeding end of the first-stage belt conveyor. In this embodiment, the gap between the paper receiving roller 14 and the first conveyor belt is 5 mm. In this embodiment, in the horizontal direction, the gap between the paper receiving roller 14 and the first conveyor belt is directly opposite to the paper outlet 111 of the sheet-fed printing press.

[0036] To ensure the smooth movement of the paper on the first-stage belt conveyor, four paper guiding wheel groups 151 are mounted above the first upper side portion 131. Corresponding to each first conveyor belt, each paper guiding wheel group 151 has a paper guiding wheel 15. All the paper guiding wheels in each paper guiding wheel group 151 are rotatably mounted on the frame through the same rotating shaft. In Figure 1 and Figure 3 four paper guiding wheel groups are shown. For clarity, Figure 4 only one paper guiding wheel group is shown. The number of paper guiding wheels in each paper guiding wheel group can be set according to specific needs, and it is not necessary to set a paper guiding wheel corresponding to each first conveyor belt. Moreover, the number of paper guiding wheel groups can also be set according to specific needs. When it can ensure the smooth movement of the paper on the first-stage belt conveyor, the paper guiding wheels can be omitted, that is, the paper guiding wheel groups are cancelled. In this embodiment, there is a 3.2-mm slit for the paper to pass between the paper guiding wheel and the upper surface of the first upper side portion of the first conveyor belt. It can be understood that in other embodiments, the slit can also be 2 mm, 2.8 mm, 3.5 mm, 4.2 mm or 5 mm, or other values between 2 - 5 mm.

[0037] To prevent the paper on the second-stage belt conveyor from falling along the first axis direction, a limiting member 26 is provided at one end of the second-stage belt conveyor far from the common roller. The limiting member is fixedly mounted on the frame and is used to block the paper on the second-stage belt conveyor from continuing to move along the first axis direction.

[0038] In this embodiment, the limiting member 26 abuts against the upper surface of the second upper side portion 231 of the second conveyor belt. The limiting member 26 is located at one end of the second upper side portion of the secondary belt conveyor away from the common roller, and in the first axis direction, the limiting member 26 is located on the side of the second central axis 221 of the second rear roller 22 facing the common roller. The limiting member is in the shape of a flat plate extending along the second axis direction, and the side surface 261 of the limiting member facing the primary belt conveyor is in the shape of a plane perpendicular to the first axis direction.

[0039] Above the common roller, a paper guiding portion 30 is provided. The paper guiding portion 30 includes a paper guiding cylinder 31 rotatably mounted on the frame via a paper guiding shaft 35 and a paper guiding plate 32 fixedly mounted on the paper guiding cylinder 31. The paper guiding plate extends from the paper guiding cylinder towards the second paper outlet end. There is a paper guiding slit 36 for the paper to pass through between the paper guiding cylinder 31 and the first conveyor belt 13. The paper coming from the primary belt conveyor enters the secondary belt conveyor through the paper guiding slit 36. In this embodiment, the width of the paper guiding slit is 5 mm. It can be understood that according to different actual situations, in other embodiments, the width of the paper guiding slit can also be 2 mm, 3 mm, 4 mm or 6 mm, or other values between 2 - 6 mm.

[0040] A torsion spring 34 is movably sleeved on the paper guiding shaft 35. One end of the torsion spring 34 is fixed on the frame, and the other end of the torsion spring abuts against the upper surface of the paper guiding plate. The lower surface of the paper guiding plate forms a pressing surface 321, and the pressing surface 321 is tangent to the lower side portion of the outer peripheral surface 311 of the paper guiding cylinder 31, so that the paper can smoothly enter the paper guiding slit 36. The torsion spring can push the paper guiding plate to rotate downward. It can be understood that in another embodiment, the other end of the torsion spring can also be fixed in the upper side area of the paper guiding cylinder, and the other end of the torsion spring cannot be fixed in the lower side area of the paper guiding cylinder to avoid scratching the paper.

[0041] In this embodiment, a virtual plane 310 passes through the first central axis of the common roller in the vertical direction, that is, the first central axis of the common roller is located within the virtual plane 310. The paper guiding cylinder 31 of the paper guiding portion is located on the side of the virtual plane facing the first paper inlet end, and the paper guiding plate is in the shape of a wedge with the small end extending towards the second paper outlet end. In this embodiment, the thickness of the part of the paper guiding plate exceeding the virtual plane towards the second paper outlet end is controlled between 0.4 - 0.6 mm.

[0042] In this embodiment, when the paper guiding plate rotates downward, it can abut against the second conveyor belt.

[0043] The paper supporting part 40 includes a lifting device installed on the frame and a paper supporting member 45 installed on the lifting device. Driven by the lifting device, the paper supporting member can reciprocate vertically. When one end of the paper on the secondary belt conveyor abuts against the limiting member, the end of the paper away from the limiting member is located under the guide paper board. When the paper supporting member reciprocates vertically, it can lift the paper upward, pull out the end of the paper away from the limiting member from under the guide paper board, and press it against the upper surface of the guide paper board. Specifically, in this embodiment, when one end of the paper on the secondary belt conveyor abuts against the limiting member, the overlapping length between the end of the paper away from the limiting member and the guide paper board is 20 mm. It can be understood that in other embodiments, the overlapping length between the end of the paper away from the limiting member and the guide paper board can also be 10 mm, 15 mm, 25 mm, 35 mm, 50 mm or 60 mm, and of course, it can also be other values between 10 - 60 mm.

[0044] Specifically, in this embodiment, the lifting device adopts a pneumatic piston cylinder 46. The cylinder barrel 41 of the pneumatic piston cylinder 46 is fixedly installed on the frame. The piston rod 42 of the pneumatic piston cylinder 46 extends upward vertically. A cross plate 43 is detachably installed at the top of the piston rod 42 by bolts. The cross plate 43 is arranged horizontally. A number of vertical rods 44 are fixedly installed on the cross plate. The vertical rods extend upward vertically. A paper supporting member 45 is welded to the top of each vertical rod. In this embodiment, the paper supporting member 45 is in the shape of a horizontally arranged plate. In other embodiments, the lifting device can also adopt an electric piston cylinder or a hydraulic piston cylinder, or a driving device with a linear motion component such as a linear motor.

[0045] Viewed vertically, the paper supporting member 45 is located in the inter - belt gap 233 between two adjacent second conveyor belts. When the paper supporting member moves upward vertically, the upper surface of the paper supporting member can exceed the upper surface of the second upper side part 231 of the second conveyor belt 23 upward; when the paper supporting member moves downward vertically, the upper surface of the paper supporting member can exceed the upper surface of the second upper side part of the second conveyor belt downward. The paper supporting part 40 is located on the side of the secondary belt conveyor facing the common roller, so as to smoothly pull out the end of the paper from under the guide paper board. In this embodiment, the paper supporting member 45 is in the shape of a plate extending horizontally and has a smooth and flat upper surface.

[0046] When the paper supporting member exceeds the upper surface of the second upper side part 231 of the second conveyor belt 23 upward, it can lift the paper on the secondary belt conveyor upward, so that the end of the paper on the secondary belt conveyor facing the primary belt conveyor is pulled out from the paper guide slit and pressed downward against the upper surface of the guide paper board.

[0047] A hollow shaft 241 is rotatably mounted on the frame via a bearing, and the hollow shaft is located between the second upper side portion 231 and the second lower side portion 232. A negative pressure paper feeding wheel 24 is fixedly sleeved on the hollow shaft, so that the negative pressure paper feeding wheel 24 is located between the second upper side portion and the second lower side portion of the second transmission belt. A paper feeding motor 242 is fixedly mounted on the frame, and the output shaft of the paper feeding motor is connected to one end of the hollow shaft, and a rotary joint 243 is provided at the other end of the hollow shaft, and the rotary joint is used to connect to the negative pressure device. A negative pressure hole 244 connected to the inner cavity of the hollow shaft is provided on the negative pressure paper feeding wheel, and the negative pressure hole radially penetrates the outer peripheral surface of the negative pressure paper feeding wheel. In this embodiment, the paper feeding motor 242 specifically adopts a servo motor. The negative pressure device is also called a vacuum device. When working, the negative pressure device evacuates the hollow shaft via the rotary joint, so that negative pressure is generated in the negative pressure hole for adsorbing paper. In this embodiment, in the horizontal direction, the hollow shaft 241 is located between the paper supporting portion 40 and the limiting member 26, and the negative pressure generated in the hollow shaft is negative 1-1.2 kPa.

[0048] In this embodiment, a negative pressure paper feeding wheel 24 is provided corresponding to each inter-belt gap 233, and when viewed in the vertical direction, the negative pressure paper feeding wheel 24 is located in the corresponding inter-belt gap 233. In other embodiments, the number of negative pressure paper feeding wheels 24 can be set according to specific needs, and there is no need to provide a negative pressure paper feeding wheel 24 corresponding to each inter-belt gap 233. When it can ensure that the paper can smoothly enter the folding machine, the negative pressure paper feeding wheel 24 can also be cancelled.

[0049] When the present embodiment is working, after the printed paper is discharged from the paper outlet 111 of the flat sheet printing machine 100, it enters the first-stage belt conveyor through the gap between the paper receiving roller 14 and the first conveyor belt, and is driven by the first conveyor belt to move toward the direction of the secondary belt conveyor, and is moved to the secondary belt conveyor through the paper guide gap 36 between the paper guide cylinder 31 and the first conveyor belt 13. When the end of the paper facing the limiter 26 abuts against the limiter, the movement of the paper stops, and the end of the paper away from the limiter is still pressed under the paper guide. The pneumatic piston cylinder 46 is started, and the piston rod 42 extends upward to move the paper supporting member 45 upward. When the upper surface of the paper supporting member exceeds the upper surface of the second upper side portion 231 of the second conveyor belt 23, the paper is lifted upward, so that the end of the paper pressed under the paper guide is pulled out from under the paper guide, and then the piston rod is retracted, so that the paper is completely laid flat on the second conveyor belt 23, and the end of the paper away from the limiter is pressed on the paper guide.

[0050] During operation, the rotary joint 243 needs to be connected to the negative pressure device in advance. In this embodiment, the negative pressure device adopts a rotary vane vacuum pump, and the negative pressure generated in the hollow shaft is negative 1-1.2 kPa, so that the paper can be stably maintained on the secondary belt conveyor.

[0051] When the second piece of paper moved from the first-level belt conveyor enters the second-level belt conveyor through the paper guide slit 36, it is located below the previous piece of paper. Thus, on the second-level belt conveyor, the latter piece of paper is always located below the previous piece of paper. During continuous operation, 2 - 4 pieces of paper are held on the second-level belt conveyor. Generally, the paper holding capacity of the second-level belt conveyor should not exceed 10 pieces.

[0052] The paper feed and friction wheel 510 is used to move the paper on the second-level belt conveyor to the folding machine 500 for folding, thereby realizing the automatic transfer of the paper from the sheet-fed printing press 100 to the folding machine 500 and improving the operation efficiency.

Claims

1. A paper conveying device between a sheet-fed printing press and a folder, characterized in that, It includes a first-stage belt conveyor, a second-stage belt conveyor and a paper supporting part installed on a rack. The first-stage belt conveyor has a number of first conveyor belts arranged at intervals, and the second-stage belt conveyor has a number of second conveyor belts arranged at intervals; The first paper outlet end of the first-stage belt conveyor and the second paper inlet end of the second-stage belt conveyor share a common roller. The first-stage belt conveyor and the second-stage belt conveyor are connected together along the first axis direction through the common roller; the first paper inlet end of the first-stage belt conveyor is used to receive the paper transferred from a sheet-fed printing press, and the second paper outlet end of the second-stage belt conveyor is directly opposite to the paper inlet of a folding machine; the first paper inlet end is located at one end of the first-stage belt conveyor far from the second-stage belt conveyor and faces away from the second-stage belt conveyor along the first axis, and the second paper outlet end is located at one end of the second-stage belt conveyor far from the first-stage belt conveyor and on one side of the second axis direction of the second-stage belt conveyor; both the first axis and the second axis extend horizontally and are perpendicular to each other; A paper guiding part is arranged above the common roller. The paper guiding part includes a paper guiding cylinder rotatably installed on the rack and a paper guiding plate fixedly installed on the paper guiding cylinder. The paper guiding plate extends from the paper guiding cylinder towards the second paper outlet end. There is a paper guiding slit for the paper to pass through between the paper guiding cylinder and the first conveyor belt; a limiting part is arranged at one end of the second-stage belt conveyor far from the common roller. The limiting part is used to block the paper on the second-stage belt conveyor from continuing to move along the first axis direction; A virtual plane passes through the central axis of the common roller in the vertical direction. The paper guiding cylinder of the paper guiding part is located on the side of the virtual plane towards the first paper inlet end, and the paper guiding plate is in a wedge shape with the small end extending towards the second paper outlet end; When observing along the vertical direction, when one end of the paper on the second-stage belt conveyor abuts against the limiting part, the overlapping length between the end of the paper far from the limiting part and the paper guiding plate is 10 - 60 mm; The paper supporting part includes a lifting device installed on the rack and a paper supporting member installed on the lifting device. Driven by the lifting device, the paper supporting member can reciprocate in the vertical direction; When one end of the paper on the second-stage belt conveyor abuts against the limiting part, the end of the paper far from the limiting part is located under the paper guiding plate. When the paper supporting member reciprocates in the vertical direction, it can lift the paper upward, pull out the end of the paper far from the limiting part from under the paper guiding plate and press it against the upper surface of the paper guiding plate.

2. The paper conveying device according to claim 1, characterized in that, When observing along the vertical direction, the paper supporting member is located in the inter-belt gap between two adjacent second conveyor belts. When the paper supporting member moves upward in the vertical direction, the upper surface of the paper supporting member can exceed the upper surface of the second upper side part of the second conveyor belt upward; when the paper supporting member moves downward in the vertical direction, the upper surface of the paper supporting member can exceed the upper surface of the second upper side part of the second conveyor belt downward.

3. The paper conveying device according to claim 1, characterized in that, A paper receiving roller is rotatably installed directly above the first front roller at the first paper inlet end of the first-stage belt conveyor.

4. The paper conveying device according to claim 1, characterized in that, The first-stage belt conveyor is inclined. The first-stage belt conveyor extends upward obliquely from the common roller towards the direction away from the second-stage belt conveyor; the second-stage belt conveyor is horizontally arranged.

5. The paper conveying device according to claim 1, characterized in that, The paper guiding cylinder is rotatably mounted on the frame via a paper guiding shaft. A torsion spring is movably sleeved on the paper guiding shaft. One end of the torsion spring is fixed on the frame, and the other end of the torsion spring abuts against the upper surface of the paper guiding plate or is fixed on the paper guiding cylinder. The torsion spring can push the paper guiding plate to rotate downward and abut against the second conveyor belt.

6. The paper conveying device according to claim 1, characterized in that, The limiting member is located at one end of the second upper side of the secondary belt conveyor away from the common roller; the limiting member is in the shape of a flat plate extending along the second axis direction, and the side surface of the limiting member facing the primary belt conveyor is in the shape of a plane perpendicular to the first axis direction.

7. The paper conveying device according to claim 1, characterized in that, A negative pressure paper feeding wheel is provided on the secondary belt conveyor. The negative pressure paper feeding wheel is located between the second upper side and the second lower side of the second conveyor belt. The negative pressure paper feeding wheel is rotatably mounted on the frame via a hollow shaft. A paper feeding motor is fixedly mounted on the frame. The output shaft of the paper feeding motor is connected to one end of the hollow shaft. A rotary joint is provided at the other end of the hollow shaft, and the rotary joint is used to connect to a negative pressure device; Negative pressure holes communicating with the inner cavity of the hollow shaft are provided on the negative pressure paper feeding wheel, and the negative pressure holes penetrate through the outer peripheral surface of the negative pressure paper feeding wheel in the radial direction; in the horizontal direction, the hollow shaft is located between the paper supporting portion and the limiting member.

8. The paper conveying device according to claim 1, characterized in that, A paper guiding wheel is rotatably provided on the upper side of the primary belt conveyor, and there is a slit for the paper to pass through between the paper guiding wheel and the upper surface of the first upper side of the first conveyor belt.

Images