Paper feeding device of laser printer

Abstract

The utility model discloses a paper feeding device of a laser printer, relates to the technical field of paper feeding of laser printers, and solves the problems that when a paper feeding device of a laser printer in the prior art is used for feeding paper, the paper is easy to be stuck or a plurality of paper is fed at the same time, the paper feeding device comprises a paper box, and the inner wall of the paper box is hinged with a bearing plate; the bottom of the paper box is fixedly connected with a first motor, and the inner wall of the bottom of the paper box is rotationally connected with a threaded rod. When the pickup roller conveys paper, the paper pickup force of the pickup roller is accurately controlled, so that the paper is stably conveyed to a printing area in a printer from a paper box, the printing speed is improved, and the probability that the paper is stuck and damaged in the conveying process and multiple pieces of paper are conveyed at the same time is reduced.

Description

Technical Field

[0001] This invention relates to the field of laser printer paper feeding technology, and more specifically, to a laser printer paper feeding device. Background Technology

[0002] A laser printer is a device that uses laser technology for printing. One of its core components is the internal paper feeding mechanism, which is responsible for removing paper from the paper tray and delivering it to the printing position. The paper feeding mechanism plays a crucial role in the operation of a laser printer. Existing paper feeding mechanisms use rotating paper feed rollers to compress and pull the stacked paper in the paper tray to the printing position within the printer. However, this process is prone to problems such as paper jams or multiple sheets being fed simultaneously. Therefore, we propose a new paper feeding mechanism for laser printers. Utility Model Content

[0003] The purpose of this invention is to provide a paper feeding device for laser printers, which aims to solve the problems of paper jamming or multiple sheets being fed in at the same time in the existing laser printer paper feeding devices.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a paper feeding device for a laser printer, including a paper tray, a support plate hinged to the inner wall of the paper tray, a first motor fixedly connected to the bottom of the paper tray, a threaded rod rotatably connected to the inner wall of the bottom of the paper tray, the main shaft of the first motor passing through the inner wall of the bottom of the paper tray to its interior and fixedly connected to the bottom of the threaded rod, a push tube threadedly connected to the threaded rod, a slide plate fixedly connected between the tops of the push tubes, push rods symmetrically arranged on the top of the slide plate, one end of the push rod passing through the slide plate and slidably connected to the point through which it passes, a slider slidably connected to the bottom of the support plate, the other end of the slider hinged to the top of the push rod, a load-bearing pressure spring sleeved on the outer wall of the push rod, the two ends of the load-bearing pressure spring abutting against the top of the slide plate and the bottom of the slider respectively, and a paper feeding mechanism for separately crimping stacked papers and feeding them to the printing position inside the printer is provided inside the paper tray.

[0005] Preferably, the paper feeding mechanism includes an inclined output plate, which is fixedly connected to the inner wall of the paper box. A storage cover is fixedly connected to the inner wall of the paper box, and a second motor is fixedly connected to the outer wall of the paper box. The main shaft of the second motor passes through the paper box and the storage cover to the interior of the storage cover. A pressure sensor electrically connected to the first motor is fixedly connected to the top inner wall of the storage cover. A fixing frame is fixedly connected to the other end of the pressure sensor. A paper feeding wheel is rotatably connected to the inner wall of the fixing frame. One end of the main shaft of the second motor, which passes through the storage cover, passes through the fixing frame and is fixedly connected to the rotating shaft of the paper feeding wheel.

[0006] Preferably, the inner end wall of the fixing cover has symmetrically arranged limiting grooves, the inner wall of the limiting groove is slidably connected to a limiting block, the bottom of the limiting block is fixedly connected to an adjusting pressure spring, the other end of the adjusting pressure spring is fixedly connected to the bottom inner wall of the limiting groove, the inner wall of the storage cover is rotatably connected to a lower clamping roller, the outer wall of the limiting block is hinged to an eccentric wheel through a torsion spring, the other end of the eccentric wheel is hinged to an upper clamping roller through a torsion spring, the outer wall of the main shaft of the second motor is fixedly connected to a smooth ratchet, the smooth ratchet and the rotating shaft of the upper clamping roller are synchronously rotated through an elastic belt, the upper clamping roller and the lower clamping roller form a paper feeding and return channel for paper to pass through, the inner wall of the storage cover is fixedly connected to an arc-shaped push plate that fits against the outer wall of the eccentric wheel, and the outer wall of the eccentric wheel is fixedly connected to a stop bar.

[0007] Preferably, a rubber sheeter is fixedly connected to the top of the output sheet.

[0008] Preferably, a photoelectric sensor is provided on the inner wall of the cardboard box, and the photoelectric sensor is electrically connected to the second motor.

[0009] Preferably, the top of the support plate is fixedly connected with symmetrically arranged baffle plates.

[0010] Preferably, the end of the paper output plate closest to the support plate is arc-shaped.

[0011] Preferably, both the upper clamping roller and the lower clamping roller are made of rubber.

[0012] Compared with the prior art, the beneficial effects of this new technology are:

[0013] 1. This new invention, through the setting of a bearing plate, threaded rod, push tube, slide plate, push rod, slider, load-bearing pressure spring, output paperboard, storage cover, pressure sensor, fixing frame, and paper feed roller, achieves precise control of the paper feed roller's paper-feeding force when the paper feed roller is feeding paper, thereby smoothly conveying the paper from the paper tray to the printing area inside the printer, thus improving printing speed and reducing the probability of problems such as paper jamming, damage, and simultaneous feeding of multiple sheets during the conveying process.

[0014] 2. This new invention also uses photoelectric sensors and paper feed rollers to detect the paper transmission status in real time. When paper jams or multiple sheets are fed at the same time, the paper is reversed to correct the paper, thereby reducing the frequency of maintenance and replacement of parts and thus reducing maintenance costs.

[0015] 3. This new type of paper also uses a limiting groove, a limiting block, an adjusting pressure spring, a lower clamp, an eccentric wheel, and an upper clamping roller to assist in the paper's reverse correction. This prevents multiple sheets of paper from being unable to be reversed simultaneously, which would otherwise affect the paper feeding process. Furthermore, during the assisted correction process, the paper is pressed flat to prevent wrinkles from causing the paper to jam and become damaged during subsequent feeding. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this novel invention;

[0017] Figure 2 This is a first sectional view of the paper box in this new invention;

[0018] Figure 3 This is a second sectional view of the paper box in this new invention;

[0019] Figure 4 for Figure 3 Enlarged view of section A in the image;

[0020] Figure 5 This is a cross-sectional view of the storage cover in this new invention;

[0021] Figure 6 This is a schematic diagram of the limiting groove in this novel design.

[0022] Explanation of the labels in the diagram:

[0023] 1. Paper box; 2. Support plate; 3. First motor; 4. Threaded rod; 5. Push tube; 6. Slide plate; 7. Push rod; 8. Slider; 9. Load-bearing pressure spring; 10. Paper output plate; 11. Storage cover; 12. Second motor; 13. Pressure sensor; 14. Fixing frame; 15. Paper feed roller; 16. Limiting groove; 17. Limiting block; 18. Adjusting pressure spring; 19. Lower clamping roller; 20. Eccentric wheel; 21. Upper clamping roller; 22. Smooth ratchet; 23. Push plate; 24. Stop bar; 25. Pager; 26. Photoelectric sensor; 27. Stop plate. Detailed Implementation

[0024] like Figures 1 to 6As shown, the present invention relates to a paper feeding device for a laser printer, including a paper box 1, a bearing plate 2 hinged to the inner wall of the paper box 1, a first motor 3 fixedly connected to the bottom of the paper box 1, a threaded rod 4 rotatably connected to the inner wall of the bottom of the paper box 1, the main shaft of the first motor 3 passing through the inner wall of the bottom of the paper box 1 to its interior and fixedly connected to the bottom of the threaded rod 4, a push tube 5 threadedly connected to the threaded rod 4, a slide plate 6 fixedly connected between the tops of the push tubes 5, a push rod 7 symmetrically arranged on the top of the slide plate 6, one end of the push rod 7 passing through the slide plate 6 and slidably connected to the point through which it passes, a slider 8 slidably connected to the bottom of the bearing plate 2, the other end of the slider 8 hinged to the top of the push rod 7, a load-bearing pressure spring 9 sleeved on the outer wall of the push rod 7, the two ends of the load-bearing pressure spring 9 abutting against the top of the slide plate 6 and the bottom of the slider 8 respectively, and a paper feeding mechanism for separately crimping stacked papers and feeding them to the printing position inside the printer is provided inside the paper box 1;

[0025] The paper feeding mechanism includes an inclined output board 10, which is fixedly connected to the inner wall of the paper box 1. A storage cover 11 is fixedly connected to the inner wall of the paper box 1. A second motor 12 is fixedly connected to the outer wall of the paper box 1. The main shaft of the second motor 12 passes through the paper box 1 and the storage cover 11 to the inside of the storage cover 11. A pressure sensor 13, which is electrically connected to the first motor 3, is fixedly connected to the top inner wall of the storage cover 11. A fixing frame 14 is fixedly connected to the other end of the pressure sensor 13. A paper feeding wheel 15 is rotatably connected to the inner wall of the fixing frame 14. One end of the main shaft of the second motor 12, which passes through the storage cover 11, passes through the fixing frame 14 and is fixedly connected to the rotating shaft of the paper feeding wheel 15.

[0026] In use, the operator places stacked papers on the support plate 2. The pressure sensor 13 detects the pressure and transmits a signal to the first motor 3, causing it to rotate the threaded rod 4. The rotation of the threaded rod 4 causes the threaded push tube 5, connected to it, to push the slide plate 6 upwards. The upward movement of the slide plate 6 pushes the slider 8 through the load-bearing pressure spring 9. During this process, the push rod 7 limits the load-bearing pressure spring 9 and the slider 8. The upward movement of the slider 8 pushes the support plate 2 to twist, causing one end of the stacked papers to tilt, so that the top of the papers comes into contact with the paper feed roller 15. This causes the paper feed roller 15 to press against the pressure sensor 13 through the fixing frame 14. Upon detecting the pressure, the pressure sensor 13 transmits a signal to the first motor 3, stopping its operation. It should be noted that as the paper is gradually fed into the printer... After the printing position is reached, the thickness of the paper on the carrier plate 2 decreases, and the pressure on the paper feed roller 15 decreases. Therefore, the pressure sensor 13 will transmit a signal to the first motor 3 again, causing the first motor 3 to run again and push the paper to adhere to the paper feed roller 15. This keeps the force of the paper adhering to the paper feed roller 15 constant. The rotation of the second motor 12 will drive the paper feed roller 15 to rotate. The rotation of the paper feed roller 15 will push the paper on the uppermost side of the carrier plate 2 towards the output plate 10, and from the output plate 10 to the printing position in the printer. This cycle completes the paper feeding. It achieves precise control of the paper feeding force of the paper feed roller 15 when feeding paper, so as to smoothly feed the paper from the paper tray 1 to the printing area in the printer, thereby improving the printing speed and reducing the probability of problems such as paper jamming, damage, and multiple sheets being fed at the same time during the feeding process.

[0027] When problems such as paper jamming, damage, or multiple sheets being transported simultaneously occur during the conveying process, the first motor 3 runs in reverse, which causes the paper feed roller 15 to reverse and correct the paper.

[0028] As a preferred option, such as Figures 3 to 6As shown, the inner end wall of the fixed cover is provided with symmetrically arranged limiting grooves 16. The inner wall of the limiting groove 16 is slidably connected to the limiting block 17. The bottom of the limiting block 17 is fixedly connected to the adjusting pressure spring 18. The other end of the adjusting pressure spring 18 is fixedly connected to the bottom inner wall of the limiting groove 16. The inner wall of the storage cover 11 is rotatably connected to the lower clamping roller 19. The outer wall of the limiting block 17 is hinged to the eccentric wheel 20 through a torsion spring. The other end of the eccentric wheel 20 is hinged to the upper clamping roller 21 through a torsion spring. The outer wall of the main shaft of the second motor 12 is fixedly connected to the smooth ratchet 22. The smooth ratchet 22 and the rotating shaft of the upper clamping roller 21 are synchronously rotated through an elastic belt. The upper clamping roller 21 and the lower clamping roller 19 form a paper feeding and return channel for paper to pass through. The inner wall of the storage cover 11 is fixedly connected to the arc-shaped push plate 23 that fits against the outer wall of the eccentric wheel 20. The outer wall of the eccentric wheel 20 is fixedly connected to the stop bar 24.

[0029] In use, when the second motor 12 reverses and causes the paper feed roller 15 to reverse, the second motor 12 will also drive the upper clamping roller 21 to rotate via the smooth ratchet 22. The upper clamping roller 21 is hinged to the eccentric disk via a torsion spring, so the upper clamping roller 21 will also drive the eccentric disk to rotate. When the eccentric disk rotates, it is blocked by the push plate 23, causing the eccentric disk to start pressing the limiting block 17. After the limiting block 17 presses the adjusting pressure spring 18 in the limiting groove 16, it begins to move, causing the upper clamping roller 21 to move towards the lower clamping roller 19. As the eccentric disc rotates, the stop bar 24 is blocked by the push plate 23, preventing the eccentric disc from rotating. This causes the upper clamping roller 21 and the lower clamping roller 19 to come into contact and clamp the paper that needs to be reversed. Because the upper clamping roller 21 and the eccentric disc are hinged by a torsion spring, the eccentric disc is blocked and cannot rotate, but the upper clamping roller 21 can still rotate. This causes the upper clamping roller 21 and the lower clamping roller 19 to come into contact and rotate, clamping the paper and starting the reverse correction. And because of the clamping of the paper, the paper can be squeezed flat.

[0030] Once the paper is reversed and corrected, the second motor 12 feeds the paper again, and the eccentric disc and the upper clamping roller 21 begin to reset and twist under the torque of their own torsion springs. The limit block 17 begins to reset and move under the elastic force of the adjusting pressure spring 18, thereby causing the eccentric disc and the upper clamping roller 21 to reset and move.

[0031] As another preferred option, such as Figure 4 As shown, a rubber sheeter 25 is fixedly connected to the top of the output sheet 10;

[0032] When in use, the rubber-made pager 25 ensures that when multiple sheets of paper are fed at the same time, the friction between the bottom sheet and the pager 25 is greater than the friction between the sheets, thus blocking the bottom sheet and reducing the probability of multiple sheets of paper being fed at the same time.

[0033] As another preferred option, such as Figures 1 to 3 As shown, a photoelectric sensor 26 is installed on the inner wall of the cardboard box 1, and the photoelectric sensor 26 is electrically connected to the second motor 12.

[0034] In use, the photoelectric sensor 26 detects the paper feeding status and controls the second motor 12 to automatically reverse the paper.

[0035] As another preferred option, such as Figure 2 As shown, symmetrically arranged baffle plates 27 are fixedly connected to the top of the support plate 2;

[0036] In use, the paper is blocked by the baffle plate 27 to increase the stability of the paper when it is stacked and transported on the carrier plate 2.

[0037] As another preferred option, such as Figure 4 As shown, the end of the paperboard 10 near the support plate 2 is curved;

[0038] When in use, the curved paper output board 10 can guide the paper and prevent it from getting stuck during the conveying process.

[0039] As another preferred option, such as Figure 4 As shown, both the upper clamping roller 21 and the lower clamping roller 19 are made of rubber.

[0040] When in use, the rubber upper clamping roller 21 and lower clamping roller 19 can increase the friction when in contact with the paper without damaging the paper.

[0041] Working Principle: This embodiment provides a paper feeding device for a laser printer. During use, the operator places stacked paper on the support plate 2. The pressure sensor 13 detects the pressure and transmits a signal to the first motor 3, causing the first motor 3 to rotate the threaded rod 4. The rotation of the threaded rod 4 causes the push tube 5, which is threaded to it, to push the slide plate 6 upwards. The upward movement of the slide plate 6 pushes the slider 8 through the load-bearing pressure spring 9. During this process, the push rod 7 limits the load-bearing pressure spring 9 and the slider 8. The upward movement of the slider 8 pushes the support plate 2 to twist, causing one end of the stacked paper to tilt, so that the top of the paper comes into contact with the paper feed roller 15. This causes the paper feed roller 15 to press against the pressure sensor 13 through the fixing frame 14. After detecting the pressure, the pressure sensor 13 transmits a signal to the first motor 3, causing it to stop operating. It should be noted that as the paper... As the paper is gradually fed into the printing position inside the printer, the thickness of the paper on the carrier plate 2 decreases, and the pressure on the paper feed roller 15 decreases. Therefore, the pressure sensor 13 will send a signal to the first motor 3 again, causing the first motor 3 to run again and push the paper to adhere to the paper feed roller 15. This keeps the force of the paper adhering to the paper feed roller 15 constant. Meanwhile, the rotation of the second motor 12 will drive the paper feed roller 15 to rotate. The rotation of the paper feed roller 15 will rub the paper on the uppermost side of the carrier plate 2 towards the output plate 10, and from the output plate 10 it will move towards the printing position inside the printer. This cycle completes the paper feeding. This achieves precise control of the force of the paper feed roller 15 when feeding paper, so as to smoothly feed the paper from the paper tray 1 to the printing area inside the printer, thereby improving the printing speed and reducing the probability of problems such as paper jamming, damage, and simultaneous feeding of multiple sheets during the feeding process.

[0042] When problems such as paper jamming, damage, or multiple sheets being transported simultaneously occur during the conveying process, the first motor 3 runs in reverse, which causes the paper feed roller 15 to reverse and correct the paper.

[0043] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this invention based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A paper feeding device for a laser printer, characterized in that, Includes a cardboard box (1), with a bearing plate (2) hinged to the inner wall of the cardboard box (1), a first motor (3) fixedly connected to the bottom of the cardboard box (1), and a threaded rod (4) rotatably connected to the inner wall of the bottom of the cardboard box (1). The main shaft of the first motor (3) passes through the inner wall of the bottom of the cardboard box (1) to its interior and is fixedly connected to the bottom of the threaded rod (4). A push tube (5) is fitted on the threaded rod (4) and threadedly connected thereto. A sliding plate (6) is fixedly connected between the tops of the push tubes (5). The top of the sliding plate (6) is provided with symmetrically arranged... A push rod (7) has one end that passes through the slide plate (6) and is slidably connected to the point through which it passes. A slider (8) is slidably connected to the bottom of the support plate (2). The other end of the slider (8) is hinged to the top of the push rod (7). A load-bearing pressure spring (9) is sleeved on the outer wall of the push rod (7). The two ends of the load-bearing pressure spring (9) abut against the top of the slide plate (6) and the bottom of the slider (8), respectively. The inside of the paper box (1) is provided with a paper feeding mechanism for separating the stacked papers and feeding them to the printing position inside the printer.

2. The paper feeding device for a laser printer according to claim 1, characterized in that, The paper feeding mechanism includes an inclined output board (10), which is fixedly connected to the inner wall of the paper box (1). A storage cover (11) is fixedly connected to the inner wall of the paper box (1). A second motor (12) is fixedly connected to the outer wall of the paper box (1). The main shaft of the second motor (12) passes through the paper box (1) and the storage cover (11) to the inside of the storage cover (11). A pressure sensor (13) electrically connected to the first motor (3) is fixedly connected to the top inner wall of the storage cover (11). A fixing frame (14) is fixedly connected to the other end of the pressure sensor (13). A paper feeding wheel (15) is rotatably connected to the inner wall of the fixing frame (14). One end of the main shaft of the second motor (12) passes through the storage cover (11) and is fixedly connected to the shaft of the paper feeding wheel (15) through the fixing frame (14).

3. A paper feeding device for a laser printer according to claim 2, characterized in that, The included fixed cover has symmetrically arranged limiting grooves (16) on its inner end wall. A limiting block (17) is slidably connected to the inner wall of the limiting groove (16). An adjusting pressure spring (18) is fixedly connected to the bottom of the limiting block (17). The other end of the adjusting pressure spring (18) is fixedly connected to the bottom inner wall of the limiting groove (16). A lower clamping roller (19) is rotatably connected to the inner wall of the storage cover (11). An eccentric wheel (20) is hinged to the outer wall of the limiting block (17) by a torsion spring. The other end of the eccentric wheel (20) is connected to the inner wall of the storage cover (11) by a torsion spring. The upper clamping roller (21) is hinged to the torsion spring. A smooth ratchet (22) is fixedly connected to the outer wall of the main shaft of the second motor (12). The smooth ratchet (22) and the rotating shaft of the upper clamping roller (21) are synchronously connected by an elastic belt. The upper clamping roller (21) and the lower clamping roller (19) form a paper feeding and return channel for paper to pass through. An arc-shaped push plate (23) that fits against the outer wall of the eccentric wheel (20) is fixedly connected to the inner wall of the storage cover (11). A stop bar (24) is fixedly connected to the outer wall of the eccentric wheel (20).

4. A laser printer paper feeding device according to claim 2, characterized in that, A rubber-made pager (25) is fixedly connected to the top of the output paperboard (10).

5. A paper feeding device for a laser printer according to claim 2, characterized in that, The inner wall of the cardboard box (1) is provided with a photoelectric sensor (26), which is electrically connected to the second motor (12).

6. A laser printer paper feeding device according to claim 4, characterized in that, The top of the support plate (2) is fixedly connected with symmetrically arranged baffle plates (27).

7. A laser printer paper feeding device according to claim 2, characterized in that, The end of the paper output plate (10) near the bearing plate (2) is arc-shaped.

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