Paper feeding device of offset press

Abstract

The paper feeding device of the offset press comprises a paper feeding rack, a triangular block, a lifting plate, a lifting assembly and a paper feeding roller, the triangular block is arranged on the paper feeding rack, the upper portion of the lifting plate is used for stacking paper, the lifting plate moves in the bevel edge direction of the triangular block, and the lifting assembly is arranged on the triangular block. Stacked paper abuts against the inclined face of the triangular block, the paper feeding roller is rotationally connected to the paper feeding rack, and the paper feeding roller abuts against the part, staggered from the stacked paper, of the paper at the highest position. The paper feeding device has the effect of reducing the influence on the paper stacking state in the paper feeding process.

Description

Technical Field

[0001] The present application relates to the field of offset printing presses, and in particular to a paper feeding device of an offset printing press. Background Art

[0002] An offset printing press is a type of lithographic printing press. During printing, the printed image is first printed from the printing plate onto a rubber cylinder, and then transferred to the paper by the rubber cylinder. An offset printing press is the mainstream of modern paper printing.

[0003] Offset printing presses use a paper feeding device to feed paper. Currently, Chinese utility model patent publication number CN206529083U discloses a two-sided monochrome offset printing press and its paper feeding device, comprising a frame with a paper stacking platform, a lifting cylinder, and a movable frame whose height is adjusted by the lifting cylinder. The movable frame has a pickup suction cup and a pickup mechanism that drives the pickup cup in vertical and short-range lateral motion. The frame has a pickup air pump connected to the pickup cup, a traverse cylinder, a piston rod of the traverse cylinder, a delivery suction cup, a delivery air pump connected to the delivery suction cup, and a conveyor belt on the frame located on one side of the piston rod of the traverse cylinder. This application has the effect of improving conveying efficiency.

[0004] There is suction between completely overlapping papers. Picking up the papers directly with the suction cup may easily cause the adjacent papers to move, causing the stacked papers to become disordered and the subsequent offset printing effect to be greatly reduced. Summary of the Invention

[0005] In order to reduce the impact on the state of stacked paper during the paper feeding process, the present application provides a paper feeding device for an offset printing press.

[0006] The present application provides a paper feeding device for an offset printing press, which adopts the following technical solution:

[0007] A paper feeding device of an offset printing press includes a paper feeding frame, a triangular block, a lifting plate, a lifting assembly, and a paper feeding roller. The triangular block is set on the paper feeding frame, and the lifting plate is used for stacking paper. The lifting plate moves along the oblique side of the triangular block, and the stacked paper abuts the inclined surface of the triangular block. The paper feeding roller is rotatably connected to the paper feeding frame, and the paper feeding roller abuts the paper at the highest point.

[0008] By adopting the above technical solution, the staff first stacks the paper on the lifting plate, and then abuts the paper on the triangular block. The paper affixed to the triangular block is staggered with each other, and the lifting component drives the lifting plate to move, and the lifting plate moves the stacked paper toward the paper feed roller. The rotating paper feed roller abuts the staggered part of the top paper and the stacked paper, so the paper feed roller only contacts the top paper. Driven by the paper feed roller, the paper is fed into the offset printing machine, reducing the movement of adjacent papers and reducing the impact on the state of the stacked papers during the paper feeding process.

[0009] Optionally, the lifting assembly includes two transmission rollers, a transmission belt and a transmission motor. The two transmission rollers are distributed along the hypotenuse direction of the triangular block. The transmission rollers are rotatably connected to the triangular block. The transmission belt is sleeved on the transmission rollers. The transmission motor drives one of the transmission rollers to rotate, and the lifting plate is arranged on the transmission belt.

[0010] By adopting the above technical solution, the staff places the stacked papers on the lifting plate, and then abuts the stacked papers against the inclined surface of the triangular block. The staff then starts the transmission motor, the transmission motor drives the transmission roller to drive, the transmission roller drives the transmission belt to move, and the transmission belt causes the lifting plate to move toward the oblique side of the triangular block. The lifting plate abuts the top sheet of the stacked papers against the paper feed roller. The lifting component has a simple structure and is easy for the staff to operate.

[0011] Optionally, a plurality of rollers are provided on the lifting plate, and the plurality of rollers are distributed along the direction from the lifting plate to the triangular block, and the rollers are rotatably connected to the lifting plate.

[0012] By adopting the above technical solution, the lowest part of the stacked paper is more difficult to overlap on the inclined surface of the triangular block. The staff can first place the stacked paper on several rollers, and then move the stacked paper toward the triangular block, so that the lowest part of the stacked paper can be better overlapped on the inclined surface of the triangular block. The rollers can reduce the possibility of damage to the bottom paper during the position adjustment process.

[0013] Optionally, a positioning plate for abutting against stacked papers is provided on the triangular block.

[0014] By adopting the above technical solution, the triangular block is used to abut one side wall of the stacked paper, and the positioning plate is used to abut the other side wall of the stacked paper. The position of the stacked paper can be determined by the triangular block and the positioning plate, thereby improving the printing accuracy of the subsequent offset printing machine.

[0015] Optionally, the paper feeder frame is also provided with a pushing component for pushing the stacked paper to abut against the inclined surface of the triangular block, and the pushing component includes a mounting frame, a pushing plate and a rotating part. The mounting frame is provided on the paper feeder frame, one end of the pushing plate is rotatably connected to the mounting frame, and the rotating part is used to drive the pushing plate to abut against the stacked paper.

[0016] By adopting the above technical solution, when the stacked papers are placed on the lifting plate and the lowest point of the stacked papers abuts against the triangular block, the staff can start the pushing assembly, and the rotating part drives the pushing plate to rotate, and the pushing plate abuts against the side wall of the stacked papers away from the triangular block. Under the action of the pushing plate, the stacked papers abut against the inclined surface of the triangular block. The pushing plate makes the side of the stacked papers away from the triangular block evenly stressed, and the distribution of the stacked papers is more even, which improves the effect of subsequent paper feeding by the paper feed roller.

[0017] Optionally, the rotating part includes a mounting block, a cam, a mating block and a driving member, the mounting block is arranged on the mounting frame, the cam is rotatably connected to the mounting block, the mating block is arranged on the push plate, the mating block is slidably connected to the outer wall of the cam, and the driving member is used to drive the cam to rotate.

[0018] By adopting the above technical solution, the driving member is used to drive the cam to rotate, the distance from the outer wall of the cam to the axis of the cam changes, and the matching block is slidably connected to the outer wall of the cam. When the distance between the matching block and the cam axis increases, the push plate rotates toward the triangular block, pushing the stacked paper to abut against the inclined surface of the triangular block. The rotating part has a simple structure and is easy for staff to operate.

[0019] Optionally, the rotating part also includes a progressive part, which includes a screw and a progressive motor. The mounting block is slidably connected to the mounting frame in the vertical direction, the screw is rotatably connected to the mounting frame, the mounting block is threadedly connected to the screw, the progressive motor is used to drive the screw to rotate, and the mating block is slidably connected to the push plate.

[0020] By adopting the above technical solution, directly pushing the stacked papers onto the inclined surface of the triangular block at one time may easily cause the stacked papers to fall over. By pushing the stacked papers in small amounts multiple times, the moving distance of the stacked papers is made more uniform and better fits the inclined surface of the triangular block. The staff can start the progressive motor, and the progressive motor drives the screw to rotate, and the screw drives the mounting block to gradually approach the rotation axis of the push plate. During the movement of the mounting block, the cam rotates at the same time, and the cam will drive the matching block to rotate, and the matching block drives the push plate to rotate. As the mounting block gradually approaches the rotation axis of the push plate, the rotation angle of the push plate gradually increases until the stacked papers are abutted against the inclined surface of the triangular block.

[0021] Optionally, the driving member includes a gear and a rack, the gear is coaxially arranged with the cam, the gear is arranged on the cam, the rack is parallel to the sliding direction of the mounting block, the rack is arranged on the mounting frame, and the rack is engaged with the gear.

[0022] By adopting the above technical solution, the progressive motor drives the screw to rotate, the screw drives the mounting block to move toward the rotation axis of the push plate, the mounting block drives the cam to move, the gear on the cam moves relative to the rack, the gear rotates, the gear drives the cam to rotate, and the matching block moves along the outer wall of the cam, and the matching block drives the push plate to rotate, so that the push plate abuts against the side wall of the stacked paper. As the mounting block gradually approaches the rotation axis of the push plate, the rotation angle of the push plate gradually increases until the stacked paper abuts against the inclined surface of the triangular block. The driving component has a simple structure, and through cooperation with the progressive component, the stacked paper is abutted against the triangular block.

[0023] Optionally, the pushing assembly also includes a moving part, which includes a moving motor and a moving screw. The moving screw is parallel to the direction from the lifting plate to the triangular block. The moving screw is rotatably connected to the paper feeder frame. The mounting frame is threadedly connected to the moving screw. The moving motor is used to drive the moving screw to rotate.

[0024] By adopting the above technical solution, due to the different sizes of paper, it is necessary to adjust the position of the pushing plate relative to the triangular block according to the size of the paper. When the position of the pushing plate needs to be adjusted, the staff can drive the moving motor, the moving motor drives the moving screw to rotate, the moving screw drives the mounting frame to move, and the mounting frame drives the pushing plate to move until the lowest point of the pushing plate abuts against the lowest point of the stacked paper. When the stacked paper fits the triangular block, the staff drives the mounting frame to move again through the moving part, so that the mounting frame is out of the moving range of the lifting plate. The structure of the moving part is reasonable and convenient for the staff to operate.

[0025] Optionally, the outer wall of the paper feeding roller is provided with an anti-skid layer for improving friction.

[0026] By adopting the above technical solution, the anti-slip layer increases the friction between the paper feed roller and the paper, and the paper feed roller can better drive the paper to separate from the stacked paper.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The stack of paper placed on the lifting plate is attached to the inclined surface of the triangular block, and the lifting assembly drives the stack of paper toward the paper feed roller;

[0029] 2. The pushing component is used to evenly fit the stacked papers onto the inclined surface of the triangular block.

[0030] 3. The progressive member and the driving member enable the cam to drive the push plate to gradually increase its rotation angle when the mounting block moves vertically downward. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram of the paper feeding device of the offset printing machine.

[0032] Figure 2 yes Figure 1 Exploded view of the lift assembly.

[0033] Figure 3 yes Figure 1 Schematic diagram of the other side of the paper feed mechanism of an offset printing press, used to show the moving parts.

[0034] Figure 4 yes Figure 3 The cross-sectional view of the push plate is used to show the matching relationship between the cam and the matching block.

[0035] Figure 5 This is a schematic diagram of the offset printing press in the working state, used to show the coordination between the push plate and the triangular block.

[0036] : Illustrations: 1. Paper feeder frame; 2. Triangular block; 21. Placement slot; 22. Positioning plate; 3. Lifting plate; 31. Accommodating slot; 32. Roller; 4. Lifting assembly; 41. Transmission roller; 42. Transmission belt; 43. Transmission motor; 5. Paper feed roller; 51. Anti-slip layer; 52. Paper feed motor; 6. Pushing assembly; 61. Mounting frame; 62. Pushing plate; 63. Rotating part; 631. Mounting block; 632. Cam; 633. Matching block; 634. Driving member; 635. Mounting rod; 636. Slide groove; 637. Ring groove; 64. Moving member; 641. Moving motor; 642. Moving screw; 65. Progressive member; 651. Screw; 652. Progressive motor; 71. Gear; 72. Rack. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The present application embodiment discloses a paper feeding device of an offset printing machine. Figure 1 and Figure 2The lifting plate 3 is arranged horizontally, and the lifting plate 3 is slidably connected to the inclined surface of the triangular block 2. The lifting assembly 4 is used to drive the lifting plate 3 to slide, and the paper feeding roller 5 is parallel to the width direction of the paper feeding frame 1. The paper feeding roller 5 is rotatably connected to the paper feeding frame 1, and the paper feeding roller 5 abuts against the staggered part of the highest paper and the stacked paper. A paper feeding motor 52 is fixedly provided on the paper feeding frame 1, and the paper feeding motor 52 drives the paper feeding roller 5 to rotate. The outer wall of the paper feeding roller 5 is fixedly provided with an anti-slip layer 51, and the anti-slip layer 51 is used to contact the staggered part of the paper at the highest stack and the stacked paper, and the pushing assembly 6 is used to make the stacked paper abut against the inclined surface of the triangular block 2.

[0039] Reference Figure 1 and Figure 2 The inclined surface of the triangular block 2 is provided with a placement groove 21, which extends in a direction perpendicular to the inclined surface of the triangular block 2. The lifting assembly 4 includes two transmission rollers 41, a transmission belt 42 and a transmission motor 43. The two transmission rollers 41 are distributed along the inclined surface of the triangular block 2. The transmission rollers 41 are parallel to the width direction of the paper feeder frame 1. The transmission rollers 41 are rotatably connected to the inner side wall of the placement groove 21. The transmission belt 42 is sleeved on the two transmission rollers 41. The outer side wall of the transmission belt 42 is flush with the inclined surface of the triangular block 2. The transmission motor 43 is fixed on the triangular block 2. The transmission motor 43 is The output shaft is fixedly connected to one of the transmission rollers 41, and the lifting plate 3 is fixedly arranged on the outer side wall of the transmission belt 42. The upper end surface of the lifting plate 3 is provided with a receiving groove 31, and a plurality of rollers 32 are arranged in the receiving groove 31. The rollers 32 are distributed along the length direction of the paper feeder frame 1, and the rollers 32 are parallel to the width direction of the paper feeder frame 1. The rollers 32 are rotatably connected to the inner side wall of the receiving groove 31. A positioning plate 22 is also provided on the triangular block 2. The positioning plate 22 is vertically arranged, and one end of the positioning plate 22 is fixedly arranged on the inclined surface of the triangular block 2, and the positioning plate 22 is perpendicular to the inclined surface of the triangular block 2.

[0040] Reference Figure 3 and Figure 4 The pushing assembly 6 includes a mounting frame 61, a pushing plate 62, a rotating portion 63, a moving member 64 and a progressive member 65. The moving member 64 includes a moving motor 641 and a moving screw 642. The length direction of the moving screw 642 is parallel to the length direction of the paper feeder frame 1. The moving screw 642 is rotatably connected to the paper feeder frame 1. The moving screw 642 is fixedly arranged on the paper feeder frame 1. The output shaft of the moving screw 642 is fixedly connected to one end of the moving screw 642. The mounting frame 61 is slidably connected to the paper feeder frame 1 along the length direction of the moving screw 642. The mounting frame 61 is threadedly connected to the moving screw 642.

[0041] Reference Figure 3 and Figure 4 The push plate 62 is connected to the mounting bracket 61 in a rotational manner along the width direction of the paper feeder frame 1. The rotating portion 63 includes a mounting block 631, a cam 632, a matching block 633, a driving member 634 and a mounting rod 635. The mounting rod 635 is vertically arranged. The mounting rod 635 is located on the side of the push plate 62 away from the triangular block 2. The lower end surface of the mounting rod 635 is fixedly arranged on the mounting block 631. The side wall of the mounting rod 635 is provided with a sliding groove 636. The sliding groove 636 extends in the vertical direction and gradually increases. The feed member 65 includes a screw 651 and a progressive motor 652. The screw 651 is arranged vertically and is located in the sliding groove 636. The screw 651 is rotatably connected to the side wall of the sliding groove 636. The progressive motor 652 is fixedly arranged on the mounting frame 61. The output shaft of the progressive motor 652 is fixedly connected to the upper end face of the screw 651. The mounting block 631 is slidably connected to the sliding groove 636 along the length direction of the screw 651. The mounting block 631 is threadedly connected to the screw 651.

[0042] Reference Figure 4 and Figure 5 The rotation axis of the cam 632 is parallel to the width direction of the paper feeder frame 1, the cam 632 is rotatably connected to the side wall of the mounting block 631, the matching block 633 is located on the side of the push plate 62 away from the triangular block 2, and the sliding direction of the matching block 633 is perpendicular to the rotation axis of the push plate 62. The outer wall of the cam 632 is provided with an annular groove 637, and the matching block 633 is slidably connected in the annular groove 637. The driving member 634 includes a gear 71 and a rack 72. The rack 72 is vertically arranged, and the lower end face of the rack 72 is fixedly arranged on the mounting frame 61. The gear 71 is coaxially arranged with the cam 632, and the gear 71 is fixedly arranged on the cam 632. The gear 71 is engaged with the rack 72. When the cam 632 is at the highest point of the screw 651, the push plate 62 is in a vertical state. When the cam 632 is at the lowest point of the screw 651, the push plate 62 is parallel to the inclined surface of the triangular block 2.

[0043] The implementation principle of the paper feeding device of an offset printing machine in the embodiment of the present application is as follows: the staff first places the stacked paper on the roller 32 of the lifting plate 3, and makes the stacked paper abut against the positioning plate 22, and then the staff can start the moving motor 641, and the moving motor 641 drives the moving screw 642 to rotate, and the moving screw 642 drives the pushing plate 62 to abut against the stacked paper until the lower end of the paper is pushed to abut the lowest point of the inclined surface of the triangular block 2, and then the staff can start the progressive motor 652, and the progressive motor 652 drives the screw 651 to rotate, and the screw 651 drives the mounting block 631 to move in a vertical downward direction, and the mounting block 631 drives the cam 632 to move, and during the movement of the mounting block 631, the gear 71 on the cam 632 and the gear The rack 72 is engaged, the rack 72 drives the gear 71 to rotate, the gear 71 drives the cam 632 to rotate, the matching block 633 slides along the outer wall of the cam 632, the cam 632 drives the push plate 62 to rotate, and the push plate 62 moves the stacked paper toward the inclined surface of the triangular block 2. As the mounting block 631 gradually moves downward, the distance between the cam 632 and the rotation axis of the push plate 62 gradually approaches, and the cam 632 can drive the push plate 62 to rotate at an angle that gradually increases until the push plate 62 is parallel to the inclined surface of the triangular block 2. At this time, the stacked paper is completely in contact with the inclined surface of the triangular block 2. Then the moving motor 641 is started again, and the moving motor 641 drives the moving screw 642 to rotate, and the moving screw 642 drives the push plate 62 to move away from the triangular block 2.

[0044] Then the transmission motor 43 is started, and the transmission motor 43 drives the transmission roller 41 to rotate, and the transmission roller 41 drives the transmission belt 42 to move, and the transmission belt 42 moves the stacked paper toward the paper feed roller 5 until the highest paper abuts against the anti-slip layer 51 on the paper feed roller 5, and the paper feed roller 5 moves the top layer of paper toward the offset printing press.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A paper feeding device for an offset printing press, characterized in that: The utility model comprises a paper feed frame (1), a triangular block (2), a lifting plate (3), a lifting assembly (4) and a paper feed roller (5), wherein the triangular block (2) is arranged on the paper feed frame (1), and the stacked paper is placed above the lifting plate (3), and the lifting plate (3) moves along the oblique side direction of the triangular block (2), and the stacked paper abuts against the oblique surface of the triangular block (2); the paper feed roller (5) is rotatably connected to the paper feed frame (1), and the paper feed roller (5) abuts against the portion where the highest paper is staggered from the stacked paper.

2. The paper feeding device of an offset printing press according to claim 1, characterized in that: The lifting assembly (4) includes two transmission rollers (41), a transmission belt (42) and a transmission motor (43). The two transmission rollers (41) are distributed along the hypotenuse direction of the triangular block (2). The transmission rollers (41) are rotatably connected to the triangular block (2). The transmission belt (42) is sleeved on the transmission rollers (41). The transmission motor (43) drives one of the transmission rollers (41) to rotate. The lifting plate (3) is arranged on the transmission belt (42).

3. The paper feeding device of an offset printing press according to claim 1, characterized in that: A plurality of rollers (32) are provided on the lifting plate (3), and the plurality of rollers (32) are distributed along the direction from the lifting plate (3) to the triangular block (2), and the rollers (32) are rotatably connected to the lifting plate (3).

4. The paper feeding device of an offset printing press according to claim 1, characterized in that: The triangular block (2) is provided with a positioning plate (22) for abutting against stacked paper sheets.

5. The paper feeding device of an offset printing press according to claim 1, characterized in that: The paper feeder frame (1) is further provided with a pushing assembly (6) for pushing the stacked paper to abut against the inclined surface of the triangular block (2). The pushing assembly (6) comprises a mounting frame (61), a pushing plate (62) and a rotating portion (63). The mounting frame (61) is provided on the paper feeder frame (1), one end of the pushing plate (62) is rotatably connected to the mounting frame (61), and the rotating portion (63) is used to drive the pushing plate (62) to abut against the stacked paper.

6. The paper feeding device of an offset printing press according to claim 5, characterized in that: The rotating portion (63) includes a mounting block (631), a cam (632), a matching block (633) and a driving member (634), wherein the mounting block (631) is arranged on the mounting frame (61), the cam (632) is rotatably connected to the mounting block (631), the matching block (633) is arranged on the pushing plate (62), the matching block (633) is slidably connected to the outer side wall of the cam (632), and the driving member (634) is used to drive the cam (632) to rotate.

7. The paper feeding device of an offset printing press according to claim 6, characterized in that: The rotating portion (63) further includes a progressive member (65), the progressive member (65) including a screw rod (651) and a progressive motor (652), the mounting block (631) is slidably connected to the mounting frame (61) in a vertical direction, the screw rod (651) is rotatably connected to the mounting frame (61), the mounting block (631) is threadedly connected to the screw rod (651), the progressive motor (652) is used to drive the screw rod (651) to rotate, and the matching block (633) is slidably connected to the push plate (62).

8. The paper feeding device of an offset printing press according to claim 7, characterized in that: The driving member (634) includes a gear (71) and a rack (72), wherein the gear (71) is coaxially arranged with the cam (632), the gear (71) is arranged on the cam (632), the rack (72) is parallel to the sliding direction of the mounting block (631), the rack (72) is arranged on the mounting frame (61), and the rack (72) is engaged with the gear (71).

9. The paper feeding device of an offset printing press according to claim 8, characterized in that: The pushing assembly (6) further includes a moving member (64), the moving member (64) including a moving motor (641) and a moving screw (642), the moving screw (642) being parallel to the direction from the lifting plate (3) to the triangular block (2), the moving screw (642) being rotatably connected to the paper feeder frame (1), the mounting frame (61) being threadedly connected to the moving screw (642), and the moving motor (641) being used to drive the moving screw (642) to rotate.

10. The paper feeding device of an offset printing press according to claim 1, characterized in that: The outer side wall of the paper feeding roller (5) is provided with an anti-slip layer (51) for increasing friction.

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