A paper feeder for newspaper printing

Abstract

This application relates to a paper feeder for newspaper printing, belonging to the field of printing equipment. It includes a frame, a pickup device, a drive device, and an adsorption device. The frame includes a base, a support rod, and a paper feed frame. The paper feed frame and the top of the support rod are slidably connected. A first cylinder for driving the paper feed frame to slide is provided on the support rod. The pickup device includes two pickup rollers, one located inside the paper feed frame and fixedly connected to it, and the other located inside the paper feed frame and rotatably connected to it. The drive device drives the pickup roller to roll along the paper feed frame. The adsorption device is located on the side wall of the paper feed frame and is used to adsorb and pick up paper. This application can prevent stacked papers from sticking together during the paper feeding process and reduces the possibility of upper-layer paper dragging lower-layer paper during movement, thereby effectively enhancing the reliability and practicality of the paper feeder.

Description

Technical Field

[0001] This application relates to the field of printing equipment, and more particularly to a paper feeder for newspaper printing. Background Technology

[0002] Newspaper and magazine printing typically requires large-scale production to meet the demands of a broad readership. Printing plants utilize specialized equipment and processes to efficiently complete large printing tasks. A paper feeder for newspaper and magazine printing is a device specifically designed to feed paper into the printing press. It is commonly used in large-scale printing processes of newspapers, magazines, books, etc., to automatically supply paper to the printing press, improving printing efficiency and production speed.

[0003] In related technologies, stack-type paper feeders are generally used in newspaper and magazine printing. This type of paper feeder is typically used in large-scale printing equipment, such as offset printing presses. They supply paper via a paper stack or tray, and use devices such as suction fans or suction cups to draw the paper into the paper feed section of the printing press. Stack-type paper feeders can usually hold a large amount of paper, reducing the need for frequent paper replenishment during printing and improving production efficiency.

[0004] However, in the related technology, when the paper feeder picks up the paper on the paper stack, the contact area between the two sheets of paper is large. When the overlapping papers are separated, the upper and lower sheets are prone to sticking together and overlapping. In addition, the upper sheet of paper is prone to dragging the lower sheet of paper during the movement, which causes the lower sheet of paper to shift and misalign. Therefore, it is not conducive to accurate and stable paper feeding in the next cycle. Summary of the Invention

[0005] In order to address the shortcomings of paper feeders in the related technology during use, this application provides a paper feeder for newspaper printing.

[0006] The paper feeding machine for newspaper printing provided in this application adopts the following technical solution:

[0007] A paper feeder for newspaper printing includes a frame, a pickup device, a drive device, and an adsorption device;

[0008] The frame includes a base, support rods, and a paper feeding frame. Multiple support rods are provided. The support rods are vertically arranged. One end of the support rod is fixedly connected to the base. The paper feeding frame is located at the end of the support rod away from the base. The paper feeding frame is slidably connected to the top of the support rod. A first cylinder for driving the paper feeding frame to slide is provided on the support rod.

[0009] The pickup device is installed on the paper feed frame. The pickup device includes two pickup rollers. One pickup roller is located inside the paper feed frame and is fixedly connected to the paper feed frame. The other pickup roller is located inside the paper feed frame and is rotatably connected to the paper feed frame.

[0010] The driving device is used to drive the pickup roller to roll along the paper feed frame, and the rolling direction of the pickup roller is parallel to the plane of the paper feed frame;

[0011] The adsorption device is located on the side wall of the paper feed frame. The adsorption device is used to provide negative pressure inside the pick-up roller, thereby adsorbing and picking up the paper.

[0012] By adopting the above technical solution, when paper is fed to the printing press by the paper feeder, the first cylinder drives the paper feed frame to slide. When the paper feed frame slides, it drives the pickup device to slide, so that the pickup device is located directly above the paper stack on the base. Then, the adsorption device is activated, and the adsorption device provides negative pressure to the pickup roller, thereby adsorbing the paper. Then, the drive device drives the pickup roller, which is rotatably connected to the paper feed frame, to rotate toward another pickup roller. During the rotation of the pickup roller, since the pickup roller has a strong adsorption force on the paper, the rotation of the pickup roller can drive one end of the paper to rotate along the pickup roller, thereby adsorbing and lifting one end of the paper. Then, the first cylinder drives the paper feed frame to rotate, so that the adsorbed paper can be sent into the feed port of the printing press. By setting up a picking roller with a rolling connection, one end of the paper can be lifted up during paper feeding, making it easier to separate overlapping papers. This reduces the problem of paper sticking together and overlapping. Lifting one end of the paper also reduces the contact area between the upper and lower layers of paper, thus reducing friction between them. This prevents the upper layer of paper from dragging the lower layer during movement, which could cause the lower layer to shift or misalign. This ensures stable and accurate paper feeding in the next cycle, effectively enhancing the reliability and practicality of the paper feeder.

[0013] Optionally, the pickup roller includes an inner roller, an outer roller, and a drive unit. A connecting shaft is coaxially fixedly connected to the end of the inner roller. A rolling gear is coaxially fixedly connected to the end of the connecting shaft away from the inner roller. The paper feeding frame has waist-shaped toothed grooves on both sides along the length direction. The rolling gear is located in the waist-shaped toothed grooves and meshes with the waist-shaped toothed grooves.

[0014] The inner roller has a plurality of evenly spaced adsorption holes on its surface. The outer roller is coaxially sleeved on the inner roller and is rotatably connected to the connecting shaft. The outer roller has a plurality of flow-blocking holes that correspond one-to-one with the adsorption holes. The driving unit is used to drive the outer roller to rotate along the connecting shaft.

[0015] By adopting the above technical solution, when the pickup roller needs to pick up paper, the adsorption device is activated to provide negative pressure inside the pickup roller, thereby adsorbing the paper. When the paper feed frame moves the paper to the printing press, the paper needs to be separated from the pickup roller so that it can enter the printing press feed inlet. At this time, the drive unit drives the outer roller to rotate along the connecting shaft, thereby misaligning the flow-blocking holes on the outer roller with the adsorption holes on the inner roller, thus closing the adsorption holes on the inner roller and stopping the adsorption of paper, thus separating the paper from the pickup roller. When the pickup roller needs to be reused to adsorb paper, the drive unit drives the outer roller to rotate, so that the flow-blocking holes on the outer roller are connected to the corresponding adsorption holes on the inner roller, thus allowing the paper to be picked up again. The pickup roller with the above structure can easily realize the picking up, adsorption, and separation of paper, thereby effectively improving the automation level and production efficiency of the paper feeder.

[0016] Optionally, the drive unit includes a first motor, a drive gear, and a driven gear ring. The driven gear ring is sleeved on a connecting shaft and coaxially fixedly connected to one end of the outer roller. A mounting plate is fixedly connected to the connecting shaft. The first motor is mounted on the mounting plate. The drive gear and the output shaft of the first motor are coaxially fixedly connected. The drive gear and the driven gear ring mesh.

[0017] By adopting the above technical solution, when it is necessary to drive the outer roller to rotate along the connecting shaft, the first motor is started, the output shaft of the first motor drives the drive gear to rotate, the drive gear rotates and drives the driven gear ring to rotate, thereby driving the outer roller to rotate. The above-mentioned drive unit has the advantages of simple structure, easy maintenance and convenient installation.

[0018] Optionally, the driving device is located on the side wall of the paper feeding frame along its length. The driving device includes a rack and a second cylinder. The rack is slidably connected to the side wall of the paper feeding frame. The sliding direction of the rack is consistent with the length direction of the paper feeding frame. The top of the rack meshes with the rolling gear. The second cylinder is used to drive the rack to slide.

[0019] By adopting the above technical solution, when the drive device needs to drive the pickup roller to roll along the paper feeding frame, the second cylinder is activated. The second cylinder drives the rack to slide along the length of the paper feeding frame. When the rack slides, it drives the rolling gear at one end of the connecting shaft to rotate, so that the rolling gear rolls in the waist-shaped tooth groove, thereby achieving the adsorption and extraction of one end of the paper. The above drive device has the advantages of being simple and practical.

[0020] Optionally, the adsorption device includes a negative pressure fan and an exhaust pipe. The casing of the negative pressure fan is fixedly connected to the paper feeding frame. One end of the exhaust pipe is fixedly connected to the exhaust port of the negative pressure fan, and the other end is coaxially inserted into the connecting shaft and rotatably connected to the inner roller. The exhaust pipe is connected to the inside of the inner roller.

[0021] By adopting the above technical solution, a negative pressure fan draws air into the inner roller, thereby creating negative pressure inside the inner roller. Then, the paper can be adsorbed and extracted through the corresponding connected adsorption holes and flow obstruction holes. The above adsorption device has the advantages of simple structure and economic practicality.

[0022] Optionally, the base is provided with multiple lifting cylinders, the extension axis of the lifting cylinders is vertically arranged, the cylinder body of the lifting cylinder is fixedly connected to the base, and the piston rod end of the lifting cylinder is fixedly connected to a placement plate.

[0023] By adopting the above technical solution, during operation, as the paper feeder works, the height of the paper stack gradually decreases. Therefore, a lifting cylinder is installed to raise the placement plate, ensuring that the top layer of paper in the stack remains in contact with the pick-up roller. This structure enhances the practicality and operational stability of the paper feeder.

[0024] Optionally, the frame further includes a limiting component located on the side of the support rod near the pick-up roller that is rotatably connected to the paper feed frame. The limiting component includes a rotating shaft, a limiting rod, and a third cylinder. The rotating shaft is rotatably connected to the support rod. Two limiting rods are provided. One end of the limiting rod is fixedly connected to the rotating shaft, and the other end extends toward the placement plate. The axial direction of the limiting rod is perpendicular to the axial direction of the rotating shaft. The third cylinder is used to drive the limiting rod to rotate along the rotating shaft.

[0025] By adopting the above technical solution, after the pickup roller lifts one end of the paper, the third cylinder drives the limiting rod to rotate counterclockwise, causing the limiting rod to engage with the lower layer of paper. This further prevents the lower layer of paper from shifting or misaligning during the paper feed frame's movement. When the pickup roller resets, the third cylinder drives the limiting rod to rotate clockwise, thus avoiding interference with the pickup roller's paper pickup and adsorption. The aforementioned limiting mechanism further reduces the possibility of the upper layer of paper dragging the lower layer during movement, thus facilitating stable and accurate paper feeding in the next cycle.

[0026] Optionally, a pulley is rotatably connected to the top of the support rod, and a groove matching the pulley is provided at the bottom of the paper feeding frame, with the pulley slidably connected within the groove.

[0027] By adopting the above technical solution, the setting of pulleys and chutes effectively reduces the friction between the paper feeding frame and the support rod, which helps to keep the paper feeding frame stable during movement, reduces the vibration of the paper feeding frame, and thus facilitates smooth and reliable paper feeding.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. This application, by setting a picking roller with a rolling connection, can pick up one end of the paper during paper feeding, thereby facilitating the separation of overlapping papers, reducing the problem of paper sticking and overlapping, and reducing the contact area between the upper and lower layers of paper after lifting one end of the paper, which helps to reduce the friction between the upper and lower paper stacks, thus preventing the upper paper from dragging the lower paper during movement, causing the lower paper to shift and misalign, thus facilitating stable and accurate paper feeding in the next cycle, and effectively enhancing the reliability and practicality of the paper feeder.

[0030] 2. By setting a limiting component, after the pickup roller lifts one end of the paper, the third cylinder drives the limiting rod to rotate counterclockwise, so that the limiting rod overlaps on the lower layer of paper. During the process of the paper feeding frame moving the paper, the problem of the lower layer of paper being shifted or misaligned can be further avoided. After the pickup roller is reset, the third cylinder drives the limiting rod to rotate clockwise, thereby avoiding interference with the pickup roller's picking up and adsorption of paper, further reducing the possibility that the upper layer of paper may drag the lower layer of paper during the movement, thus facilitating stable and accurate paper feeding in the next cycle.

[0031] 3. The pickup roller provided in this application can easily pick up, absorb and separate paper, thereby effectively improving the automation level and production efficiency of the paper feeder. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the connection structure between the pickup device and the adsorption device in an embodiment of this application;

[0034] Figure 3 This is an exploded view of the pickup roller according to an embodiment of this application;

[0035] Figure 4 yes Figure 1 An enlarged view of section A.

[0036] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Base; 111. Lifting cylinder; 112. Placement plate; 12. Support rod; 121. Pulley; 122. First cylinder; 123. Fixing rod; 13. Paper feed frame; 131. Waist-shaped toothed groove; 14. Limiting component; 141. Rotating shaft; 142. Limiting rod; 143. Third cylinder; 2. Pick-up device; 21. Pick-up roller; 211. Inner roller; 2111. Suction hole; 2112. Connecting shaft; 2113. Rolling gear; 212. Outer roller; 2121. Flow obstruction hole; 213. First motor; 214. Driving gear; 215. Driven gear ring; 3. Drive device; 31. Rack; 32. Second cylinder; 4. Suction device; 41. Negative pressure fan; 42. Exhaust pipe. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0038] This application discloses a paper feeder for newspaper printing. (See also...) Figure 1 and Figure 2 A paper feeder for newspaper printing includes a frame 1, a pickup device 2, a drive device 3, and an adsorption device 4.

[0039] Reference Figure 1 The frame 1 includes a base 11, support rods 12 and paper feeding frame 13. There are four support rods 12, which are located at the four corners of the base 11. The support rods 12 are vertically arranged along the axial direction. One end of the support rod 12 is welded to the base 11, and a pulley 121 is rotatably connected to the top of the support rod 12.

[0040] Reference Figure 1 The paper feed frame 13 is rectangular and located at the top of the support rod 12. The bottom wall of the side rod of the paper feed frame 13 along its length has grooves that match the pulleys 121. The pulleys 121 at the top of the support rod 12 are slidably connected to the grooves. The paper feed frame 13 achieves a sliding connection with the support rod 12 through the cooperation of the pulleys 121 and the grooves. The support rod 12 is equipped with two first cylinders 122 for driving the paper feed frame 13 to slide. The two first cylinders 122 are located on both sides of the paper feed frame 13 along its length. The cylinder bodies of the first cylinders 122 and the support rod 12 are fixedly connected by screws. The piston rod end of the first cylinder 122 and the end of the paper feed frame 13 are welded together by a connecting rod.

[0041] Reference Figure 1 The base 11 is equipped with four lifting cylinders 111. The cylinder body of the lifting cylinder 111 and the base 11 are fixedly connected by screws. The extension axis of the lifting cylinder 111 is vertically set. The piston rod end of the lifting cylinder 111 is welded with a placement plate 112, which is horizontally set. The placement plate 112 is used to store the paper stacks to be printed.

[0042] Reference Figure 1 and Figure 2 The pickup device 2 is installed on the paper feed frame 13. The pickup device 2 includes two pickup rollers 21. One pickup roller 21 is fixedly connected to the paper feed frame 13, and the other pickup roller 21 is rotatably connected to the paper feed frame 13.

[0043] Reference Figure 1 , Figure 2 and Figure 3 The pickup roller 21 includes an inner roller 211, an outer roller 212, and a drive unit. The inner roller 211 is a hollow cylinder. Multiple evenly spaced adsorption holes 2111 are opened through the surface of the inner roller 211. A connecting shaft 2112 is coaxially fixedly connected to the end of the inner roller 211. The outer roller 212 is coaxially sleeved on the inner roller 211. The outer roller 212 is coaxially rotatably connected to the connecting shaft 2112. Multiple flow-blocking holes 2121 corresponding one-to-one with the adsorption holes 2111 are opened on the surface of the outer roller 212.

[0044] Reference Figure 1 , Figure 2 and Figure 3 The drive unit includes a first motor 213, a drive gear 214, and a driven gear ring 215. The driven gear ring 215 is sleeved on the connecting shaft 2112 and is coaxially fixedly connected to one end of the outer roller 212. The driven gear ring 215 and the connecting shaft 2112 are clearance-fitted. A mounting plate is welded on the connecting shaft 2112. The housing of the first motor 213 and the mounting plate are fixedly connected by screws. The drive gear 214 and the output shaft of the first motor 213 are coaxially fixedly connected by a key. The drive gear 214 and the driven gear mesh.

[0045] Reference Figure 1 , Figure 2 and Figure 3 A connecting shaft 2112 of a pickup roller 21 is welded to both ends inside the paper feeding frame 13. The axial direction of the pickup roller 21 is parallel to the width direction of the paper feeding frame 13. The diameter of the outer roller 212 of the pickup roller 21 is greater than the thickness of the paper feeding frame 13.

[0046] Reference Figure 1 , Figure 2 and Figure 3 Another pickup roller 21 has a rolling gear 2113 coaxially welded to the end of the connecting shaft 2112. The paper feeding frame 13 has waist-shaped toothed grooves 131 on both sides along the length direction. The rolling gear 2113 at the end of the connecting shaft 2112 is located in the waist-shaped toothed groove 131, and the bottom of the rolling gear 2113 meshes with the waist-shaped toothed groove 131.

[0047] Reference Figure 1 , Figure 2 and Figure 3The drive unit 3 is located on the side wall of the paper feeding frame 13 along its length. The drive unit 3 includes a rack 31 and a second cylinder 32. The rack 31 is slidably connected to the side wall of the paper feeding frame 13, and the sliding direction of the rack 31 is consistent with the length direction of the paper feeding frame 13. The top of the rack 31 meshes with the rolling gear 2113. The cylinder body of the second cylinder 32 is welded to the side wall of the paper feeding frame 13, and the piston rod end of the second cylinder 32 is welded to the end of the rack 31. The second cylinder 32 drives the rack 31 to slide through the housing, thereby driving the rolling gear 2113 to rotate, which in turn drives the pickup roller 21 to roll along the paper feeding frame 13.

[0048] Reference Figure 1 and Figure 2 The adsorption device 4 is located on the side of the paper feeding frame 13 away from the drive device 3. The adsorption device 4 includes a negative pressure fan 41 and an exhaust pipe 42. The casing of the negative pressure fan 41 and the side wall of the paper feeding frame 13 are fixedly connected by screws. One end of the exhaust pipe 42 is fixedly connected to the exhaust port of the negative pressure fan 41, and the other end is coaxially inserted into the connecting shaft 2112 and rotatably connected to the inner roller 211 by a rotating joint. The exhaust pipe 42 and the inner roller 211 are internally connected.

[0049] Reference Figure 1 and Figure 4 The frame 1 also includes a limiting member 14, which is located on the side of the support rod 12 near the pickup roller 21 that is rotatably connected to the paper feeding frame 13. The limiting member 14 includes a rotating shaft 141, a limiting rod 142, and a third cylinder 143. The two ends of the rotating shaft 141 are rotatably connected to the two support rods 12 respectively. There are two limiting rods 142, which are spaced apart circumferentially along the rotating shaft 141. One end of the limiting rod 142 is welded to the rotating shaft 141, and the other end extends towards the placement plate 112. The axial direction of the limiting rod 142 is perpendicular to the axial direction of the rotating shaft 141. A fixing rod 123 is welded between the two support rods 12. There are two third cylinders 143, which are installed in a one-to-one correspondence with the two limiting rods 142. The cylinder body of the third cylinder 143 is rotatably connected to the fixing rod 123, and the piston rod of the third cylinder 143 is hinged to the limiting rod 142.

[0050] The implementation principle of a paper feeder for newspaper printing according to an embodiment of this application is as follows: When feeding paper to the printing press, the paper to be printed is first stacked on the placement plate 112. Then, the first cylinder 122 drives the paper feeding frame 13 to slide. When the paper feeding frame 13 slides, it drives the pickup device 2 to slide, so that the pickup device 2 is located directly above the paper stack on the base 11. Then, the adsorption device 4 is activated, and the adsorption device 4 provides negative pressure to the pickup roller 21, thereby adsorbing the paper. Then, the second cylinder 32 drives the rack 31 to slide along the length direction of the paper feeding frame 13. When the rack 31 slides, it drives the rolling gear 2113 at one end of the connecting shaft 2112 to rotate, so that the rolling gear 2113 rolls in the waist-shaped tooth groove 131. When the waist-shaped gear rolls, it drives the pickup roller 21 to rotate. During the rotation of the pickup roller 21, since the pickup roller 21 has a strong adsorption force on the paper, the rotation of the pickup roller 21 can drive one end of the paper along the pickup roller. The cylinder 21 rotates, thereby adsorbing and lifting one end of the paper. After the pick-up cylinder 21 lifts one end of the paper, the third cylinder 143 drives the limiting rod 142 to rotate counterclockwise, so that the limiting rod 142 overlaps on the lower stack of paper. Then, the first cylinder 122 drives the paper feeding frame 13 to rotate, which feeds the adsorbed paper into the feed inlet of the printing press. When the paper feeding frame 13 drives the pick-up device 2 to move the paper to the feed inlet of the printing press, the first motor 213 is started. The output shaft of the first motor 213 drives the drive gear 214 to rotate. When the drive gear 214 rotates, it drives the driven gear ring 215 to rotate, which in turn drives the outer cylinder 212 to rotate. This causes the flow obstruction hole 2121 on the outer cylinder 212 to be misaligned with the adsorption hole 2111 on the inner cylinder 211, thereby closing the adsorption hole 2111 on the inner cylinder 211 and stopping the adsorption of paper. This allows the paper to separate from the pick-up cylinder 21, and then the paper can smoothly enter the feed inlet of the printing press.

[0051] Next, the first cylinder 122 drives the paper feeding frame 13 to reset, the second cylinder 32 drives the pickup roller 21 to reset, and then the third cylinder 143 drives the limit rod 142 to rotate clockwise, thereby avoiding interference with the pickup roller 21's picking up and adsorption of paper, so that the next paper feeding operation can continue.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A paper feeder for newspaper printing, characterized in that: The machine frame (1), the pickup device (2), the driving device (3) and the suction device (4) are comprised. The machine frame (1) comprises a base (11), support rods (12) and a paper feeding frame (13), the support rods (12) are provided in plurality, the support rods (12) are vertically arranged, one end of the support rods (12) is fixedly connected with the base (11), the paper feeding frame (13) is located at one end of the support rods (12) away from the base (11), the paper feeding frame (13) is slidingly connected with the top of the support rods (12), a first air cylinder (122) for driving the paper feeding frame (13) to slide is arranged on the support rods (12); The pickup device (2) is mounted on the paper feeding frame (13), the pickup device (2) comprises two pickup rollers (21), one pickup roller (21) is located in the paper feeding frame (13) and is fixedly connected with the paper feeding frame (13), the other pickup roller (21) is located in the paper feeding frame (13) and is rollingly connected with the paper feeding frame (13); The driving device (3) is used for driving the pickup roller (21) to roll along the paper feeding frame (13), the rolling direction of the pickup roller (21) is parallel to the plane of the paper feeding frame (13); The suction device (4) is located on the side wall of the paper feeding frame (13), the suction device (4) is used for providing negative pressure to the pickup roller (21) to thereby adsorb and pick up the paper; The pickup roller (21) comprises an inner roller (211), an outer roller (212) and a driving part, the end of the inner roller (211) is coaxially fixedly connected with a connecting shaft (2112), one end of the connecting shaft (2112) away from the inner roller (211) is coaxially fixedly connected with a rolling gear (2113), a waist-shaped tooth groove (131) is formed on both sides of the paper feeding frame (13) along the length direction, the rolling gear (2113) is located in the waist-shaped tooth groove (131) and is engaged with the waist-shaped tooth groove (131); a plurality of adsorption holes (2111) are uniformly distributed on the surface of the inner roller (211), the outer roller (212) is coaxially sleeved on the inner roller (211), the outer roller (212) is coaxially rotatably connected with the connecting shaft (2112), a plurality of resistance flow holes (2121) corresponding to the adsorption holes (2111) are formed on the outer roller (212), and the driving part is used for driving the outer roller (212) to rotate along the connecting shaft (2112); The suction device (4) comprises a negative pressure fan (41) and an air suction pipe (42), the casing of the negative pressure fan (41) is fixedly connected with the paper feeding frame (13), one end of the air suction pipe (42) is fixedly communicated with the air suction port of the negative pressure fan (41), the other end is coaxially arranged in the connecting shaft (2112) and is rotatably connected with the inner roller (211), and the air suction pipe (42) is in communication with the inside of the inner roller (211). The base (11) is provided with a plurality of lifting cylinders (111), the telescopic axis of the lifting cylinder (111) is vertically arranged, the cylinder body of the lifting cylinder (111) is fixedly connected with the base (11), and the piston rod end of the lifting cylinder (111) is fixedly connected with a placing plate (112); the rack (1) further comprises a limiting piece (14), the limiting piece (14) is located on one side of the supporting rod (12) close to the pickup cylinder (21) rollingly connected with the paper feeding frame (13), the limiting piece (14) comprises a rotating shaft (141), a limiting rod (142) and a third cylinder (143), the rotating shaft (141) is rotatably connected with the supporting rod (12), the limiting rod (142) is provided with two ends, one end of the limiting rod (142) is fixedly connected with the rotating shaft (141), and the other end extends towards the direction close to the placing plate (112), the axial direction of the limiting rod (142) is perpendicular to the axial direction of the rotating shaft (141), and the third cylinder (143) is used for driving the limiting rod (142) to rotate along the rotating shaft (141).

2. A paper feeder for newspaper printing according to claim 1, characterized in that: The driving part comprises a first motor (213), a driving gear (214) and a driven gear ring (215), the driven gear ring (215) is sleeved on the connecting shaft (2112) and is fixedly connected with one end of the outer roller (212) in a same axis, the connecting shaft (2112) is fixedly connected with a mounting plate, the first motor (213) is mounted on the mounting plate, the driving gear (214) and the output shaft of the first motor (213) are fixedly connected in a same axis, and the driving gear (214) and the driven gear ring (215) are engaged.

3. A paper feeder for newspaper printing according to claim 1, characterized in that: The driving device (3) is located on the side wall of the paper feeding frame (13) in the length direction, the driving device (3) comprises a rack (31) and a second cylinder (32), the rack (31) is slidably connected with the side wall of the paper feeding frame (13), the sliding direction of the rack (31) is consistent with the length direction of the paper feeding frame (13), the rack (31) and the top of the rolling gear (2113) are engaged, and the second cylinder (32) is used for driving the rack (31) to slide.

4. A paper feeder for use in newspaper printing according to claim 1, characterized in that: The supporting rod (12) is rotatably connected with a pulley (121) at the top, the paper feeding frame (13) is provided with a sliding groove matched with the pulley (121) at the bottom, and the pulley (121) is slidably connected in the sliding groove.

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