A sheet-pressing device

Abstract

The utility model discloses a kind of material pressing paper feeding devices, including rack, guide roller assembly and compression roller assembly are arranged on rack, compression roller assembly is placed in the front of guide roller assembly, and compression roller assembly includes upper roller shaft and lower compression roller placed below upper roller shaft;Coaxially set with middle roller and side roller on upper roller shaft;Side roller is distributed in the left and right sides of middle roller, and with upper roller shaft sliding connection;Adjusting assembly is equipped on rack;Adjusting assembly is suitable for driving side roller moves along the axial movement of upper roller shaft, to adjust the interval between middle roller and side roller.The utility model can tension paper, and roll paper flat;The interval between middle roller and side roller is adjusted by adjusting assembly, so that compression roller assembly can effectively roll different width paper, and side roller can effectively avoid the lifting hand at paper edge, to ensure that paper is rolled flat.

Description

Technical Field

[0001] This utility model relates to the field of paper feeding device technology, and in particular to a paper feeding device with a pressing function. Background Technology

[0002] The existing paper bags are single-closure structures with a sealed bottom and an open top. A handle is attached to the top edge of the paper bag.

[0003] In existing technology, paper wound on a paper roll is transported by a traction device, and the paper transported by the traction device flows in the back-and-forth direction. Downstream of the traction device is a handle-attaching device, which is used to symmetrically attach handles to the left and right sides of the paper. The handles are spaced apart along the length of the paper (e.g., ...). Figure 2 (See paper 5 in the image). Downstream of the handle pasting device are a paper feeding device and a paper bag machine. The paper feeding device is used to transport the paper with the handle pasted on to the paper bag machine, so that the paper bag machine can perform forming, cutting and other processes on the paper to produce a paper bag.

[0004] The existing paper feeding device consists of upper and lower rollers and a motor. The paper is placed between the upper and lower rollers. Because there are handles on both sides of the paper, the left and right sides of the paper are thicker, and the middle of the paper is thinner. During the process of feeding the paper into the paper bag machine, the upper and lower rollers will over-press the thicker parts of the paper, that is, squeeze the handles on both sides of the paper, which will cause the handles to deform and affect the appearance of the finished product. Because the left and right sides of the paper are thicker, the upper and lower rollers cannot effectively press the middle of the paper, that is, they cannot press the middle of the paper flat, which will affect the quality of the subsequent finished product.

[0005] In addition, existing paper feeding devices have low compatibility and cannot adapt to various paper sizes. Utility Model Content

[0006] The purpose of this invention is to provide a paper pressing and feeding device to effectively roll and flatten the paper.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A paper feeding device includes a frame, on which a guide roller assembly and a pressure roller assembly are arranged. The pressure roller assembly is located in front of the guide roller assembly and includes an upper roller shaft and a lower pressure roller located below the upper roller shaft.

[0009] An intermediate roller and a side roller are coaxially arranged on the upper roller shaft; the side rollers are distributed to the left and / or right of the intermediate roller and are slidably connected to the upper roller shaft.

[0010] The frame is equipped with an adjustment assembly; the adjustment assembly is adapted to drive the side roller to move axially along the upper roller shaft to adjust the distance between the middle roller and the side roller. Through the cooperation of the guide roller assembly, pressure roller assembly and adjustment assembly, the paper is effectively tensioned and rolled flat.

[0011] Furthermore, the adjusting assembly includes a lead screw and a slide bar mounted on the frame, both positioned above the upper roller shaft;

[0012] A fork is threaded onto the lead screw, the fork is slidably connected to the slide rod, and the fork is mounted on the side roller.

[0013] The lead screw is adapted to drive the shift fork to move axially along the upper roller shaft, so that the shift fork adjusts the distance between the intermediate roller and the side roller. This scheme is used to adjust the distance between the intermediate roller and the side roller.

[0014] Furthermore, the side rollers are symmetrically distributed on the left and right sides of the middle roller;

[0015] The lead screw is a bidirectional lead screw, and the positive thread section and the negative thread section of the bidirectional lead screw are respectively threadedly connected to the shift fork; there are at least two shift forks, and each is forked onto the corresponding side roller. This design ensures that the side rollers are symmetrically distributed on the left and right sides of the middle roller.

[0016] Furthermore, the outer peripheral wall of the side roller is provided with an annular groove;

[0017] The fork head has an inverted U-shaped structure; the fork head is positioned within the corresponding annular groove. This design ensures that the fork head does not interfere with the normal rotation of the roller.

[0018] Furthermore, there are at least two slide rods, distributed in front of and behind the lead screw;

[0019] The shift fork is slidably connected to each of the two slide rods. This design makes the movement of the shift fork smoother.

[0020] Furthermore, the adjustment assembly also includes a handwheel;

[0021] One end of the lead screw extends to the outside of the frame and is connected to the handwheel. This design reduces the difficulty of rotating the lead screw.

[0022] Furthermore, the intermediate roller and the side roller are rotatably mounted on the upper roller shaft, and the outer diameters of the intermediate roller and the side roller are equal.

[0023] The frame is equipped with a motor for driving the lower pressure roller to rotate;

[0024] The paper is adapted to pass between the roller disposed on the upper roller shaft and the lower pressure roller. This arrangement ensures that the upper surface of the paper is flattened by the intermediate roller and the edge roller.

[0025] Furthermore, the frame is provided with side plates on the left and right sides respectively, and vertical grooves are provided on the side plates;

[0026] Both ends of the upper roller shaft are slidably connected to the corresponding vertical grooves via sliders, and a pressure spring is connected between the top of the slider and the top wall of the vertical groove. This design allows the rollers mounted on the upper roller shaft to effectively press the upper surface of the paper under the elastic force of the pressure springs.

[0027] Furthermore, the side plate is provided with an adjusting bolt for adjusting the compression of the pressure spring. Using the above solution, the compression of the pressure spring is adjusted by adjusting the bolt, thereby increasing or decreasing the force exerted by the intermediate roller and the side roller on the upper surface of the paper.

[0028] Furthermore, a bearing is provided between the upper roller shaft and the slider;

[0029] Both ends of the upper roller extend to the outside of the side plate and are connected to the handle;

[0030] A support block is provided on the outer side of the side plate, and the support block is positioned below the upper roller shaft; a corresponding groove is provided at the end of the upper roller shaft to cooperate with the support block;

[0031] The handle is adapted to drive the upper roller shaft to rotate, so that the support block supports the outer peripheral wall of the upper roller shaft or the inner wall of the slot, thereby adjusting the gap between the roller and the lower pressure roller of the upper roller shaft. This design reduces the difficulty for workers to pass new paper between the roller and the lower pressure roller of the upper roller shaft.

[0032] Furthermore, the guide roller assembly includes, from back to front, a first guide roller, a second guide roller, a third guide roller, and a fourth guide roller, all of which are arranged in parallel and can be rotatably mounted within the frame;

[0033] The second guide roller is at the same horizontal height as the third guide roller; the fourth guide roller is at a lower horizontal height than the third guide roller; the first guide roller is at a lower horizontal height than the fourth guide roller.

[0034] The paper is adapted to be conveyed sequentially around the bottom surface of the first guide roller, the top surface of the second guide roller, the top surface of the third guide roller, and the bottom surface of the fourth guide roller. Using this design, the guide roller assembly can better tension the paper.

[0035] The beneficial effects of this utility model are:

[0036] The paper can be effectively tensioned and rolled flat by the cooperation of the guide roller assembly, pressure roller assembly and adjustment assembly;

[0037] The spacing between the middle roller and the side roller is adjusted by adjusting the component so that the pressure roller assembly can effectively roll paper of different widths, and the side roller can effectively avoid the handles at the edge of the paper to ensure that the paper is rolled flat.

[0038] Through the cooperation of the upper roller shaft, the pressure spring and the vertical groove, the roller set on the upper roller shaft can effectively press the upper surface of the paper under the elastic force of the pressure spring;

[0039] The support block works in conjunction with the upper roller to reduce the difficulty for workers to pass new paper through the roller set between the upper roller and the lower pressure roller. Attached Figure Description

[0040] The present invention will be further described below with reference to the accompanying drawings:

[0041] Figure 1 This is a schematic diagram of the paper being arranged on the pressing and feeding device in this utility model;

[0042] Figure 2 This is a schematic diagram of the pressure roller assembly and adjustment assembly arranged on the side plate in this utility model;

[0043] Figure 3 This is a partial structural diagram of the paper being placed on the pressing and feeding device in this utility model;

[0044] Figure 4 This is a schematic diagram of the upper roller shaft in this utility model;

[0045] Figure 5 This is a schematic diagram of the compression spring and slider arranged on the side plate in this utility model.

[0046] The reference numerals in the attached figures are:

[0047] 1. Frame; 11. Base frame; 12. Side plate; 121. Vertical slot; 122. Adjusting bolt; 123. Stop block; 13. Support block; 14. Mounting plate;

[0048] 2. Guide roller assembly; 21. First guide roller; 22. Second guide roller; 23. Third guide roller; 24. Fourth guide roller;

[0049] 3. Pressure roller assembly; 31. Upper roller shaft; 311. Slot; 32. Lower pressure roller; 33. Intermediate roller; 34. Side roller; 341. Annular groove; 35. Motor; 36. Slider; 37. Compression spring; 38. Handle;

[0050] 4. Adjustment components; 4a. First adjustment component; 4b. Second adjustment component; 41. Lead screw; 42. Slide rod; 43. Shift fork; 431. Fork head; 44. Handwheel;

[0051] 5. Paper. Detailed Implementation

[0052] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0053] Example 1

[0054] A pressing and feeding device is suitable for installation upstream of a paper bag machine. In this embodiment, the pressing and feeding device is used to convey paper 5 with attached handles to the paper bag machine, wherein the flow direction of the paper 5 is from back to front.

[0055] Please see Figures 1-3 As shown, the paper feeding device includes a frame 1, a guide roller assembly 2, a pressure roller assembly 3, and an adjusting assembly 4. The guide roller assembly 2 and the pressure roller assembly 3 are mounted parallel to each other on the frame 1. The pressure roller assembly 3 is positioned in front of the guide roller assembly 2. The guide roller assembly 2 is adapted to tension the paper 5 and convey the paper 5 to the pressure roller assembly 3. The pressure roller assembly 3 is used to flatten the paper 5 and convey the paper 5 to the paper bag machine.

[0056] Please see Figure 2 As shown, the pressure roller assembly 3 includes an upper roller shaft 31, a lower pressure roller 32, and a motor 35. The upper roller shaft 31 and the lower pressure roller 32 are respectively mounted on the frame 1. Both the upper roller shaft 31 and the lower pressure roller 32 extend in the left-right direction, with the lower pressure roller 32 positioned below the upper roller shaft 31. The motor 35, mounted on the frame 1, drives the lower pressure roller 32 to rotate.

[0057] An intermediate roller 33 and a side roller 34 are coaxially arranged on the upper roller shaft 31. The intermediate roller 33 is located in the middle of the upper roller shaft 31 and can rotate relative to the upper roller shaft 31 but cannot move axially. The side rollers 34 are distributed to the left or right of the intermediate roller 33 and can both rotate relative to the upper roller shaft 31 and move axially. Preferably, the side rollers 34 are symmetrically distributed on the left and right sides of the intermediate roller 33. The side rollers 34 are axially slidably arranged on the upper roller shaft 31. The paper 5 is suitable for passing between the rollers (i.e., the intermediate roller 33 and the side roller 34) arranged on the upper roller shaft 31 and the lower pressure roller 32.

[0058] The frame 1 is equipped with an adjustment component 4. The adjustment component 4 is adapted to drive the side roller 34 to move axially along the upper roller shaft 31 to adjust the distance between the middle roller 33 and the side roller 34, thereby adapting to paper 5 of different widths.

[0059] The operator adjusts the distance between the intermediate roller 33 and the side roller 34 according to the position of the handle, so that the side roller 34 is positioned near the edge of the paper 5 and effectively avoids the corresponding handle. That is, the side roller 34 can effectively press the paper 5 without pressing the handle. The paper 5 flows sequentially to the guide roller assembly 2 and the pressure roller assembly 3. During this process, the guide roller assembly 2 effectively tensions the paper 5, while the intermediate roller 33, side roller 34, and lower pressure roller 32 effectively flatten the paper 5. This paper feeding device can effectively tension the paper 5 and flatten it. By adjusting the distance between the intermediate roller 33 and the side roller 34, the intermediate roller 33 and the side roller 34 can effectively press papers 5 of different widths, and the side roller 34 effectively avoids the handle at the edge of the paper 5.

[0060] Please see Figure 1 As shown, the frame 1 includes a base frame 11, two side plates 12, and two mounting plates 14. The two side plates 12 are symmetrically arranged on the left and right sides of the base frame 11. The two mounting plates 14 are symmetrically arranged on the left and right sides of the base frame 11 and are located behind the side plates 12. The left and right ends of the guide roller assembly 2 are mounted on the two mounting plates 14. The left and right ends of the upper roller shaft 31 and the lower pressure roller 32 are respectively mounted on the two side plates 12. The motor 35 is mounted on the outside of one side plate 12, and the drive end of the motor 35 is connected to one end of the lower pressure roller 32 to drive the lower pressure roller 32 to rotate.

[0061] Please see Figures 1-2 As shown, the adjusting assembly 4 includes a lead screw 41, a slide bar 42, and a shift fork 43. The lead screw 41 and slide bar 42 are respectively mounted between the two side plates 12. Both the lead screw 41 and slide bar 42 extend in the left-right direction and are positioned above the upper roller shaft 31. The upper end of the shift fork 43 is threadedly connected to the lead screw 41, and the upper end of the shift fork 43 is also slidably connected to the slide bar 42. The lower end of the shift fork 43 is forked onto the side roller 34.

[0062] When the operator rotates the lead screw 41, the lead screw 41 is adapted to drive the shift fork 43 to move axially along the upper roller shaft 31, so that the shift fork 43 moves the side roller 34 axially along the upper roller shaft 31, thereby adjusting the distance between the middle roller 33 and the side roller 34.

[0063] In this embodiment, an annular groove 341 is formed on the outer peripheral wall of the side roller 34. The fork head 431 at the lower end of the shift fork 43 has an inverted U-shaped structure. The fork head 431 is forked into the corresponding annular groove 341. The fork head 431 does not affect the normal rotation of the side roller 34.

[0064] Furthermore, to ensure smooth movement of the shift fork 43, at least two slide rods 42 are symmetrically distributed in front of and behind the lead screw 41 within the same adjusting assembly 4. In this embodiment, there are two slide rods 42 within the same adjusting assembly 4. The shift fork 43 is slidably connected to both slide rods 42.

[0065] Furthermore, to facilitate the rotation of the lead screw 41, the adjusting assembly 4 also includes a handwheel 44. Specifically, one end of the lead screw 41 extends to the outer side of the side plate 12 and is connected to the handwheel 44. The handwheel 44 is located on the outer side of the side plate 12.

[0066] In this embodiment, there are multiple side rollers 34, symmetrically arranged on the left and right sides of the intermediate roller 33. To ensure that the side rollers 34 are always symmetrically distributed on the left and right sides of the intermediate roller 33, the lead screw 41 is a bidirectional lead screw. Specifically, the left and right ends of the bidirectional lead screw are respectively provided with a positive thread section and a negative thread section. The positive thread section and the negative thread section of the bidirectional lead screw are respectively threadedly connected to a shift fork 43. There are at least two shift forks 43, and they are respectively forked onto the corresponding side rollers 34.

[0067] Preferably, within the same adjusting assembly 4, there are two shift forks 43, symmetrically distributed on the left and right sides of the intermediate roller 33, with each shift fork 43 resting on a corresponding side roller 34. When the operator rotates the lead screw 41, the two shift forks 43 respectively move the corresponding side roller 34 axially along the upper roller shaft 31, ensuring that the side rollers 34 are always symmetrically distributed on the left and right sides of the intermediate roller 33.

[0068] Furthermore, to improve the adaptability of the paper feeding device, the number of adjusting components 4 is at least two. In this embodiment, please refer to... Figure 1 and Figure 3 As shown, there are two adjustment components 4, namely the first adjustment component 4a and the second adjustment component 4b.

[0069] Specifically, the adjusting components of the first adjusting assembly 4a and the second adjusting assembly 4b are arranged vertically at intervals and are both positioned above the upper roller shaft 31. The first adjusting assembly 4a is positioned above the second adjusting assembly 4b. There are four side rollers 34, symmetrically arranged on the left and right sides of the middle roller 33. The two forks 43 in the first adjusting assembly 4a are adapted to actuate the two side rollers 34 closer to the middle roller 33. The two forks 43 in the second adjusting assembly 4b are adapted to actuate the two side rollers 34 farther from the middle roller 33. To avoid interference between the handwheels 44 of the two adjusting assemblies 4, the handwheel 44 of the first adjusting assembly 4a is located at the left end of the first adjusting assembly 4a, and the handwheel 44 of the second adjusting assembly 4b is located at the right end of the second adjusting assembly 4b.

[0070] Please see Figure 4As shown, the intermediate roller 33 and the side roller 34 are rotatably mounted on the upper roller shaft 31. The outer diameters of the intermediate roller 33 and the side roller 34 are equal to ensure that the paper 5 is rolled flat. Preferably, the cross-section of the upper roller shaft 31 is circular.

[0071] When the motor 35 drives the lower pressure roller 32 to rotate, the lower pressure roller 32 causes the paper 5, which is disposed between the upper roller shaft 31 and the lower pressure roller 32, to flow forward. During this process, the flowing paper 5 drives the intermediate roller 33 and the side roller 34 to rotate through friction.

[0072] Furthermore, for effective rolling of paper 5, please refer to... Figure 2 As shown, a vertical groove 121 is provided on the side plate 12. Specifically, both ends of the upper roller shaft 31 are slidably connected to the corresponding vertical groove 121 via sliders 36. A compression spring 37 is connected between the top of the slider 36 and the top wall of the vertical groove 121. The sliding direction of the slider 36 is vertical. Under the elastic force of the compression spring 37, the middle roller 33 and the side roller 34 effectively roll and press the upper surface of the paper 5. When the upper roller shaft 31 moves upward via the slider 36, the upper roller shaft 31 drives the side roller 34 to move upward, and the sufficiently high U-shaped structure of the fork head 431 does not affect the upward movement of the side roller 34.

[0073] Furthermore, a bearing is provided between the upper roller shaft 31 and the slider 36, the bearing being adapted to restrict the axial movement of the upper roller shaft 31. Both ends of the upper roller shaft 31 extend to the outer side of the side plate 12 and are connected to the handle 38. A support block 13 is provided on the outer side of the side plate 12. The support block 13 is positioned below the upper roller shaft 31. A corresponding groove 311 (e.g., [missing information]) is provided at the end of the upper roller shaft 31 to mate with the support block 13. Figure 4 (As shown). The handle 38 is adapted to drive the upper roller shaft 31 to rotate so that the support block 13 can support the outer peripheral wall of the upper roller shaft 31 or the inner wall of the slot 311 to adjust the gap between the roller and the lower pressure roller 32 provided on the upper roller shaft 31.

[0074] Specifically, when the upper roller shaft 31 is idle, the slot 311 is positioned downwards and engages with the support block 13, which supports the inner wall of the slot 311. When a new sheet of paper 5 needs to be passed between the roller and the lower pressure roller 32 of the upper roller shaft 31, the operator rotates the upper roller shaft 31 using the handle 38, thereby disengaging the slot 311 from the support block 13, allowing the support block 13 to support the outer peripheral wall of the upper roller shaft 31; the upper roller shaft 31 then drives the slider 36 to move upwards along the vertical groove 121. That is, the upper roller shaft 31 moves upwards under the action of the support block 13, increasing the gap between the roller and the lower pressure roller 32 of the upper roller shaft 31, so that the operator can pass the new sheet of paper 5 between the roller and the lower pressure roller 32 of the upper roller shaft 31.

[0075] After the new sheet of paper 5 passes between the roller 31 and the lower pressure roller 32, the handle 38 is reset. After resetting, the slot 311 re-engages with the support block 13, and the support block 13 re-supports the inner wall of the slot 311. With the cooperation of the slot 311 and the support block 13, the upper roller 31 will not rotate. (See also...) Figure 3 As shown, the guide roller assembly 2 includes a first guide roller 21, a second guide roller 22, a third guide roller 23, and a fourth guide roller 24. The first guide roller 21, second guide roller 22, third guide roller 23, and fourth guide roller 24 are distributed sequentially from back to front. All four guide rollers are rotatably mounted on two mounting plates 14. The four guide rollers are arranged in parallel and extend in the left-right direction.

[0076] In this embodiment, the horizontal height of the second guide roller 22 is equal to the horizontal height of the third guide roller 23. The horizontal height of the fourth guide roller 24 is lower than the horizontal height of the third guide roller 23. The horizontal height of the first guide roller 21 is lower than the horizontal height of the fourth guide roller 24. The paper 5 is adapted to be transported sequentially around the bottom surface of the first guide roller 21, the top surface of the second guide roller 22, the top surface of the third guide roller 23, and the bottom surface of the fourth guide roller 24.

[0077] Preferably, the outer diameter of the second guide roller 22 is equal to the outer diameter of the third guide roller 23, that is, the top surface of the second guide roller 22 is flush with the top surface of the third guide roller 23, so as to better tension the paper 5.

[0078] The working principle of this utility model is as follows:

[0079] The paper 5 is passed sequentially over the bottom surface of the first guide roller 21, the top surface of the second guide roller 22, the top surface of the third guide roller 23, and the bottom surface of the fourth guide roller 24. Then, by rotating the handle 38, the operator can pass the paper 5 between the roller set between the upper roller shaft 31 and the lower pressure roller 32. After the paper has passed between the roller set between the upper roller shaft 31 and the lower pressure roller 32, the handle 38 is reset.

[0080] By rotating the handwheel 44 to adjust the position of the side rollers 34, the side rollers 34 can effectively press against the left and right edges of the paper 5, while effectively avoiding the corresponding handles; that is, the side rollers 34 do not press against the handles. Specifically, when the paper 5 is narrow, the two side rollers 34 connected to the first adjusting component 4a press against the upper surface of the paper 5, and the two side rollers 34 connected to the second adjusting component 4b are positioned away from the edges of the paper 5. When the paper 5 is wide, all four side rollers 34 press against the upper surface of the paper 5.

[0081] Start the motor 35 so that the paper 5 flows sequentially to the guide roller assembly 2 and the pressure roller assembly 3. The four guide rollers can effectively tension the paper 5, while the middle roller 33, the side roller 34 and the lower pressure roller 32 can effectively flatten the paper 5.

[0082] This embodiment effectively tensions and flattens the paper by coordinating the guide roller assembly, pressure roller assembly, and adjustment assembly. The adjustment assembly adjusts the distance between the middle roller and the side rollers, allowing the pressure roller assembly to effectively press paper of different widths, while the side rollers effectively avoid the handles at the paper edges, ensuring the paper is pressed flat. Through the cooperation of the upper roller shaft, the pressure spring, and the vertical groove, the roller on the upper roller shaft effectively presses the top surface of the paper under the elastic force of the pressure spring. The support block, in conjunction with the upper roller shaft, reduces the difficulty for workers to pass new sheets of paper between the roller on the upper roller shaft and the lower pressure roller.

[0083] Example 2

[0084] The structure of Example 2 is basically the same as that of Example 1, except for the structure of the side plate 12.

[0085] Please see Figure 5 As shown, in this embodiment, the side plate 12 includes a side plate body, an adjusting bolt 122, and a stop block 123. A vertical groove 121 is formed on the side plate body. Both the upper and lower ends of the vertical groove 121 are closed. The slider 36, the pressure spring 37, and the stop block 123 are distributed sequentially from bottom to top within the vertical groove 121. Specifically, the slider 36 is slidably connected to the corresponding vertical groove 121. The upper and lower ends of the pressure spring 37 are connected to the stop block 123 and the slider 36, respectively. The adjusting bolt 122 is vertically positioned above the stop block 123. The adjusting bolt 122 is threadedly connected to the side plate body. The threaded end of the adjusting bolt 122 extends downward into the vertical groove 121 and connects to the stop block 123.

[0086] The operator can adjust the compression of the pressure spring 37 by rotating the adjusting bolt 122, thereby increasing or decreasing the force exerted by the middle roller 33 and the side roller 34 on the upper surface of the paper 5.

[0087] Furthermore, in order to adjust the compression of the spring 37 more smoothly, the stop block 123 is slidably connected to the corresponding vertical groove 121, and the stop block 123 is rotatably connected to the adjusting bolt 122.

[0088] In this embodiment, the compression of the pressure spring is adjusted by adjusting the bolt, thereby increasing or decreasing the force exerted by the middle roller and the side roller on the upper surface of the paper.

[0089] The above provides a detailed description of two embodiments of this utility model. However, the description is merely a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of the claims of this utility model should still fall within the patent protection scope of this utility model.

Claims

1. A paper feeding device, comprising a frame (1), wherein a guide roller assembly (2) and a pressure roller assembly (3) are disposed on the frame (1), the pressure roller assembly (3) being positioned in front of the guide roller assembly (2), the pressure roller assembly (3) comprising an upper roller shaft (31) and a lower pressure roller (32) positioned below the upper roller shaft (31), characterized in that: An intermediate roller (33) and a side roller (34) are coaxially arranged on the upper roller shaft (31); the side roller (34) is distributed on the left and / or right side of the intermediate roller (33) and is slidably connected to the upper roller shaft (31); The frame (1) is provided with an adjustment component (4); the adjustment component (4) is adapted to drive the side roller (34) to move along the axial direction of the upper roller shaft (31) to adjust the distance between the middle roller (33) and the side roller (34).

2. The paper feeding device according to claim 1, characterized in that, The adjustment assembly (4) includes a lead screw (41) and a slide bar (42) mounted on the frame (1), both of which are positioned above the upper roller (31); The lead screw (41) is threaded with a fork (43), the fork (43) is slidably connected to the slide rod (42), and the fork (43) is forked on the side roller (34); The lead screw (41) is adapted to drive the shift fork (43) to move axially along the upper roller shaft (31) so that the shift fork (43) adjusts the distance between the intermediate roller (33) and the side roller (34).

3. The paper feeding device according to claim 2, characterized in that, The side rollers (34) are symmetrically distributed on the left and right sides of the middle roller (33); The lead screw (41) is a bidirectional lead screw, and the positive thread section and the negative thread section of the bidirectional lead screw are respectively threaded to the shift fork (43); there are at least two shift forks (43), and they are respectively forked on the corresponding side roller (34).

4. The paper feeding device according to claim 2, characterized in that, The outer peripheral wall of the side roller (34) is provided with an annular groove (341); The fork head (431) of the fork (43) has an inverted U-shaped structure; the fork head (431) is forked in the corresponding annular groove (341).

5. The paper feeding device according to claim 2, characterized in that, There are at least two slide rods (42), which are distributed in front of and behind the lead screw (41); The fork (43) is slidably connected to the two slide rods (42) respectively.

6. The paper feeding device according to claim 1, characterized in that, The intermediate roller (33) and the side roller (34) are rotatably mounted on the upper roller shaft (31), and the outer diameters of the intermediate roller (33) and the side roller (34) are equal. The frame (1) is equipped with a motor (35) for driving the lower pressure roller (32) to rotate; The paper (5) is adapted to pass between the roller disposed on the upper roller shaft (31) and the lower pressure roller (32).

7. The paper feeding device according to claim 6, characterized in that, The frame (1) is provided with side plates (12) on the left and right sides respectively, and the side plates (12) are provided with vertical grooves (121); The two ends of the upper roller shaft (31) are slidably connected to the corresponding vertical groove (121) via sliders (36), and a pressure spring (37) is connected between the top of the slider (36) and the top wall of the vertical groove (121).

8. The paper feeding device according to claim 7, characterized in that, The side plate (12) is provided with an adjusting bolt (122) for adjusting the compression of the pressure spring (37).

9. The paper feeding device according to claim 7, characterized in that, A bearing is provided between the upper roller shaft (31) and the slider (36); Both ends of the upper roller (31) extend to the outside of the side plate (12) and are connected to the handle (38); A support block (13) is provided on the outer side of the side plate (12), and the support block (13) is placed below the upper roller shaft (31); the end of the upper roller shaft (31) is provided with a corresponding slot (311) that cooperates with the support block (13); The handle (38) is adapted to drive the upper roller shaft (31) to rotate so that the support block (13) supports the outer peripheral wall of the upper roller shaft (31) or the inner wall of the slot (311) to adjust the gap between the roller and the lower pressure roller (32) of the upper roller shaft (31).

10. The paper feeding device according to claim 1, characterized in that, The guide roller assembly (2) includes, from back to front, a first guide roller (21), a second guide roller (22), a third guide roller (23) and a fourth guide roller (24), which are arranged in parallel and can be rotatably mounted in the frame (1); The horizontal height of the second guide roller (22) is equal to the horizontal height of the third guide roller (23); the horizontal height of the fourth guide roller (24) is lower than the horizontal height of the third guide roller (23); the horizontal height of the first guide roller (21) is lower than the horizontal height of the fourth guide roller (24). The paper (5) is adapted to be transported in sequence around the bottom surface of the first guide roller (21), the top surface of the second guide roller (22), the top surface of the third guide roller (23) and the bottom surface of the fourth guide roller (24).

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