Paper height limiting mechanism of printer

Abstract

The utility model discloses a printer paper height limiting mechanism, which relates to the technical field of printers and comprises a base, an alternate height limiting mechanism is fixedly mounted at the top of the base and comprises a bottom plate fixedly mounted at the top of the base, a support plate is fixedly mounted at the top of the bottom plate, and a top plate is fixedly mounted at the top of the support plate. A motor is fixedly installed at the center of the top plate, a swing rod is fixedly installed on the outer wall of the driving end of the motor, a first connecting plate is fixedly installed at the bottom of the end, away from the motor, of the swing rod, and a first connecting column is rotationally installed at the bottom of the first connecting plate; according to the utility model, through the alternate height limiting mechanism, the height of the paper can be accurately adjusted, the paper is always kept at a stable and suitable printing height in the printing process, and poor contact between the printing head and the paper caused by unevenness of the surface of the paper is avoided, so that the printing quality is improved, and the printing efficiency is improved. And definition and accuracy of test paper printing are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, in particular to a paper height limiting mechanism for a printer. Background Art

[0002] As an indispensable device in modern office and learning, the stability and print quality of printers directly affect the user experience. In the specific application scenario of printing test papers, users have more stringent requirements for printers because the print quality of test papers is directly related to the fairness of the exam and the students' grades. Therefore, it is crucial to ensure the flatness and accuracy of the test papers during the printing process.

[0003] Existing paper limiting devices mainly solve the problem of paper positioning in the printer to prevent the paper from shifting during the printing process, thereby affecting the print quality. However, these limiting devices mostly focus on the positioning of the paper in the left and right and front and back directions, and pay less attention to limiting the paper in the vertical direction.

[0004] However, during the actual printing process, the paper often has an uneven surface due to various factors. For example, the paper becomes deformed due to moisture during storage, or becomes hot and deformed due to friction and heat accumulation during the printing process, resulting in poor contact between the print head and the paper, affecting the printing effect.

[0005] In view of this, this application is hereby filed. Utility Model Content

[0006] The purpose of the present invention is to provide a printer paper height limiting mechanism to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the utility model provides a printer paper height limiting mechanism, comprising a base, on the top of which an alternating height limiting mechanism is fixedly installed;

[0008] The alternating height limiting mechanism includes a bottom plate fixedly mounted on the top of the base, a support plate fixedly mounted on the top of the bottom plate, a top plate fixedly mounted on the top of the support plate, a motor fixedly mounted at the center of the top plate, a swing rod fixedly mounted on the outer wall of the motor driving end, a connecting plate 1 fixedly mounted on the bottom of the swing rod away from the motor, a connecting column 1 is rotatably mounted on the bottom of the connecting plate 1, a connecting rod 1 is fixedly mounted on the outer wall of the connecting column 1, a limiting column 1 is fixedly mounted on the outer wall of the connecting rod 1, a pawl 1 is rotatably mounted on the outer wall of the limiting column 1, and the swing rod is away from the connecting plate A connecting plate 2 is fixedly installed at the bottom of one end of the connecting plate 1, and a connecting column 2 is rotatably installed at the bottom of the connecting plate 2. A connecting rod 2 is fixedly installed on the outer wall of the connecting column 2, and a limiting column 2 is fixedly installed at a position slightly above the midpoint of the connecting rod 2. A pawl 2 is rotatably installed on the outer wall of the limiting column 2, and the pawl 2 is meshed with the end of the pawl 1 away from the limiting column 2 and the limiting column 1 and is connected with a ratchet. A movable plate is fixedly installed on the outer wall of the ratchet, and a sliding groove 2 is provided on the surface of the movable plate. A fixed block is slidably installed on the inner wall of the sliding groove 2, and the fixed block is fixedly installed on the side wall of the support plate.

[0009] Furthermore, the movable plate is provided with a slide groove three on both sides close to the slide groove two, a slider is slidably installed on the inner wall of the slide groove three, an upper top column is fixedly installed on the top of the slider, and a lower top column is fixedly installed on the bottom of the slider.

[0010] Furthermore, a magnet block four is fixedly installed on the side end of the upper top column, a magnet block three is fixedly installed on the end of the lower top column away from the magnet block four, the magnet block three is magnetically connected to the magnet block two, the magnet block two is fixedly installed on the bottom surface of the end of the pawl one away from the limiting column one, the side of the magnet block four away from the upper top column is magnetically connected to the magnet block one, and the magnet block one is fixedly installed on the bottom surface of the end of the pawl two away from the limiting column two.

[0011] Furthermore, a slide groove 1 is provided on the surface of the bottom plate, and a connecting rod 1, a movable plate and a connecting rod 2 are slidably installed inside the slide groove 1.

[0012] Furthermore, a clamping plate is fixedly installed on the top of the movable plate, and a printing plate is arranged inside the clamping plate.

[0013] Furthermore, a paper feeding box is fixedly mounted on the side wall of the base, a paper feeding window is provided on a side of the paper feeding box close to the base, a rotating shaft is rotatably mounted on the inner side wall of the paper feeding window, and a roller is fixedly mounted on the outer wall of the rotating shaft.

[0014] Furthermore, the roller is made of rubber, and the rubber surface is provided with an integrally formed anti-skid pattern.

[0015] Furthermore, a paper box is provided at the bottom end of the side wall of the paper feeding box away from the base, and a dustproof plate is provided on the outer wall of the paper box.

[0016] Compared with the existing technology, the beneficial effect of the present invention is that through the alternating height limiting mechanism, the height of the paper can be accurately adjusted to ensure that during the printing process, the paper always remains at a stable and suitable height for printing, avoiding poor contact between the print head and the paper due to the uneven surface of the paper, thereby improving the printing quality and ensuring the clarity and accuracy of the test paper printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front structural diagram of the printer paper height limit mechanism;

[0018] Figure 2 This is a schematic diagram of the structure of the alternating height limiting mechanism of the printer paper height limiting mechanism;

[0019] Figure 3 This is a schematic diagram of the exploded structure of the alternating height limiting mechanism of the printer paper height limiting mechanism;

[0020] Figure 4 Schematic diagram of the separation structure of the ratchet and pawl of the printer paper height limit mechanism;

[0021] Figure 5 This is a schematic diagram of the back structure of the printer's paper height limit mechanism.

[0022] In the figure: 1. Base; 2. Paper feeding box; 3. Paper feeding window; 4. Rotating shaft; 5. Roller; 6. Top plate; 7. Support plate; 8. Connecting rod 1; 9. Paper box; 10. Fixed block; 11. Bottom plate; 12. Slide groove 1; 13. Moving plate; 14. Ratchet; 15. Slide groove 2; 16. Slide groove 3; 17. Clamp; 18. Upper push column; 19. Lower push column; 20. Slider; 21. Limiting column 1; 22. Ratchet 1; 23. Connecting column 1; 24. Connecting plate 1; 25. Swinging rod; 26. Motor; 27. Connecting plate 2; 28. Connecting column 2; 29. Connecting rod 2; 30. Ratchet 2; 31. Limiting column 2; 32. Magnet block 1; 33. Magnet block 2; 34. Magnet block 3; 35. Magnet block 4; 36. Printing plate. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1 - Figure 5, the utility model provides a technical solution: a printer paper height limiting mechanism, comprising a base 1, the top of which is fixedly mounted an alternating height limiting mechanism;

[0025] The alternating height limiting mechanism includes a bottom plate 11 fixedly mounted on the top of the base 1, a support plate 7 fixedly mounted on the top of the bottom plate 11, a top plate 6 fixedly mounted on the top of the support plate 7, a motor 26 fixedly mounted at the center of the top plate 6, a swing rod 25 fixedly mounted on the outer wall of the driving end of the motor 26, a connecting plate 24 fixedly mounted on the bottom of the swing rod 25 away from the motor 26, a connecting column 23 rotatably mounted on the bottom of the connecting plate 24, a connecting rod 8 fixedly mounted on the outer wall of the connecting column 23, a limiting column 21 fixedly mounted on the outer wall of the connecting rod 8, a ratchet 22 rotatably mounted on the outer wall of the limiting column 21, and the swing rod 25 away from the connecting plate 24. A connecting plate 27 is fixedly installed at the bottom of one end, a connecting column 28 is rotatably installed at the bottom of the connecting plate 27, a connecting rod 29 is fixedly installed on the outer wall of the connecting column 28, a limiting column 21 is fixedly installed at the upper position of the midpoint of the connecting rod 29, a pawl 230 is rotatably installed on the outer wall of the limiting column 31, the pawl 230 is engaged with the end of the pawl 1 22 away from the limiting column 231 and the limiting column 1 21 and is connected with a ratchet 14, a movable plate 13 is fixedly installed on the outer wall of the ratchet 14, a slide groove 25 is provided on the surface of the movable plate 13, a fixed block 10 is slidably installed on the inner wall of the slide groove 25, and the fixed block 10 is fixedly installed on the side wall of the support plate 7.

[0026] It should be noted that the meshing relationship between the pawl 1 22 and the pawl 2 30 and the ratchet 14 ensures that the movable plate 13 maintains a fixed height during the printing process, thereby avoiding printing quality problems caused by changes in paper height.

[0027] See also Figure 3 - Figure 4 The utility model provides a technical solution: a printer paper height limiting mechanism, including a movable plate 13 with slide grooves 16 on both sides close to the slide groove 2 15, a slider 20 is slidably installed on the inner wall of the slide groove 3 16, an upper push column 18 is fixedly installed on the top of the slider 20, and a lower push column 19 is fixedly installed on the bottom of the slider 20.

[0028] It should be noted that after printing is completed, when the height of the movable plate 13 needs to be lowered, the upper push column 18 and the lower push column 19 realize the automatic reset function of the movable plate 13 by separating and re-engaging with the pawl 1 22 and the pawl 2 30.

[0029] See also Figure 4The utility model provides a technical solution: a printer paper height limiting mechanism, including a magnet block 4 35 fixedly installed on the side end of an upper push column 18, a magnet block 34 fixedly installed on the end of a lower push column 19 away from the magnet block 4 35, the magnet block 34 is magnetically connected to the magnet block 2 33, the magnet block 2 33 is fixedly installed on the bottom surface of the end of the pawl 1 22 away from the limiting column 1 21, the side of the magnet block 4 35 away from the upper push column 18 is magnetically connected to the magnet block 1 32, and the magnet block 1 32 is fixedly installed on the bottom surface of the end of the pawl 2 30 away from the limiting column 2 31.

[0030] It should be noted that when the movable plate 13 needs to be lowered, the magnetic attraction of the magnet block enables the first pawl 22 and the second pawl 30 to be separated from the ratchet 14 more easily, thereby achieving high precision adjustment and locking.

[0031] See also Figure 2 - Figure 3 The utility model provides a technical solution: a printer paper height limiting mechanism, including a slide groove 12 opened on the surface of a bottom plate 11, and a connecting rod 8, a movable plate 13 and a connecting rod 29 are slidably installed inside the slide groove 12.

[0032] It should be noted that the slide groove 12 provides a stable sliding track for the connecting rod 1 8, the movable plate 13 and the connecting rod 2 29, avoiding their deviation or shaking during the movement, thereby enhancing the stability of the entire mechanism.

[0033] See also Figure 3 The utility model provides a technical solution: a printer paper height limiting mechanism, including a clamping plate 17 fixedly installed on the top of a movable plate 13, and a printing plate 36 is arranged inside the clamping plate 17.

[0034] It should be noted that the clamping plate 17 provides a stable supporting platform for the printing plate 36, avoiding shaking or deviation caused by the weight of paper or ink during the printing process, thereby ensuring the stability and accuracy of printing.

[0035] See also Figure 1 The utility model provides a technical solution: a printer paper height limiting mechanism includes a base 1 with a paper feeding box 2 fixedly installed on the side wall, a paper feeding window 3 is opened on the side of the paper feeding box 2 close to the base 1, a rotating shaft 4 is rotatably installed on the inner wall of the paper feeding window 3, and a roller 5 is fixedly installed on the outer wall of the rotating shaft 4.

[0036] It should be noted that the rotation of the roller 5 can evenly apply pressure to the surface of the paper, which helps to eliminate wrinkles and bends in the paper and ensure that the paper remains flat during the printing process.

[0037] See also Figure 1The utility model provides a technical solution: a printer paper height limiting mechanism, including a roller 5 made of rubber, and an integrally formed anti-slip pattern on the rubber surface.

[0038] It should be noted that the rubber material itself has good friction properties, and the anti-slip grooves on the surface can further increase the friction between the roller 5 and the paper, ensuring that the paper can move forward stably during transportation and avoid sliding or deflection.

[0039] See also Figure 5 The utility model provides a technical solution: a printer paper height limiting mechanism, comprising a paper box 9 provided at the bottom end of the side wall of a paper feeding box 2 away from the base 1, and a dustproof plate provided on the outer wall of the paper box 9.

[0040] It should be noted that the presence of the dustproof plate can effectively prevent external dust and debris from entering the paper box 9, thereby protecting the test paper or paper placed in the paper box 9 from contamination and ensuring the stability of printing quality.

[0041] Working principle: Place the test paper to be printed in the paper box 9 inside the paper feeding box 2. The test paper passes through the paper feeding window 3 and is fed to the surface of the printing plate 36 under the rotation of the roller 5. At this time, the motor 26 is started to drive the swing rod 25 to swing back and forth, driving the connecting rod 1 8 and the connecting rod 2 29 to move up and down. The movement of the connecting rod 1 8 and the connecting rod 2 29 drives the pawl 1 22 and the pawl 2 30 on their surfaces to engage with the ratchet 14, thereby driving the movable plate 13 to move upward. As the movable plate 13 rises, the printing plate 36 also reaches the appropriate position. At this time, the rotation of the motor 26 is stopped to ensure that the printing plate 36 remains at the required height. During the printing process, the existence of the pawl ensures that the movable plate 13 is locked, avoiding falling due to external force, thereby ensuring the stability and accuracy of printing. When printing is completed When the upper and lower push posts 18 and 19 on the movable plate 13 contact the ends of the ratchet 1 22 and the ratchet 2 30 respectively, they will overcome the meshing force with the ratchet 14 and separate them. At this time, the movable plate 13 begins to fall under the action of gravity. Due to the magnetic attraction between the magnet blocks at the ends of the upper and lower push posts 18 and the lower push posts 19 and the magnet blocks of the ratchet 1 22 and the ratchet 2 30, the movable plate prevents the two push posts from falling immediately. When the top of the inner wall of the slide groove 3 16 contacts the slider 20 during the falling process of the movable plate 13, the gravity of the movable plate 13 will overcome the attraction between the magnet blocks, separating them, and then the ratchet 1 22 and the ratchet 2 30 re-engage with the ratchet 14 to lock the movable plate 13 again. The slider 20 automatically falls to the bottom of the slide groove 3 16 of the movable plate 13 under the action of gravity, and is ready for the next operation. The overall device realizes precise control of the height of the movable plate 13 and the printing plate 36, avoiding poor contact between the print head and the paper due to the uneven surface of the paper, thereby improving the printing quality and ensuring the clarity and accuracy of the test paper printing.

Claims

1. A printer paper height limiting mechanism, comprising a base (1), characterized in that: An alternating height limiting mechanism is fixedly installed on the top of the base (1); The alternating height limiting mechanism comprises a bottom plate (11) fixedly mounted on the top of a base (1), a support plate (7) fixedly mounted on the top of the support plate (7), a top plate (6) fixedly mounted on the top of the top plate (6), a motor (26) fixedly mounted on the center of the top plate (6), a swing rod (25) fixedly mounted on the outer wall of the driving end of the motor (26), a connecting plate (24) fixedly mounted on the bottom of the end of the swing rod (25) away from the motor (26), a connecting column (23) rotatably mounted on the bottom of the connecting plate (24), a connecting rod (8) fixedly mounted on the outer wall of the connecting column (23), a limiting column (21) fixedly mounted on the outer wall of the connecting rod (8), a ratchet (22) rotatably mounted on the outer wall of the limiting column (21), the swing rod (25) away from the connecting plate (2 4) is fixedly installed with a connecting plate 2 (27) at the bottom of one end, a connecting column 2 (28) is rotatably installed at the bottom of the connecting plate 2 (27), a connecting rod 2 (29) is fixedly installed on the outer wall of the connecting column 2 (28), a limiting column 2 (31) is fixedly installed at a position slightly above the midpoint of the connecting rod 2 (29), a pawl 2 (30) is rotatably installed on the outer wall of the limiting column 2 (31), the pawl 2 (30) and the end of the pawl 1 (22) away from the limiting column 2 (31) and the limiting column 1 (21) are engaged with a ratchet (14), a movable plate (13) is fixedly installed on the outer wall of the ratchet (14), a sliding groove 2 (15) is provided on the surface of the movable plate (13), a fixed block (10) is slidably installed on the inner wall of the sliding groove 2 (15), and the fixed block (10) is fixedly installed on the side wall of the support plate (7).

2. The printer paper height limiting mechanism according to claim 1, wherein: The movable plate (13) is provided with a third slide groove (16) on both sides close to the second slide groove (15), and a slider (20) is slidably installed on the inner wall of the third slide groove (16), an upper top column (18) is fixedly installed on the top of the slider (20), and a lower top column (19) is fixedly installed on the bottom of the slider (20).

3. The printer paper height limiting mechanism according to claim 2, wherein: The side end of the upper top column (18) is fixedly mounted with a magnet block four (35), the end of the lower top column (19) away from the magnet block four (35) is fixedly mounted with a magnet block three (34), the magnet block three (34) is magnetically connected to the magnet block two (33), the magnet block two (33) is fixedly mounted on the bottom surface of the end of the pawl one (22) away from the limiting column one (21), the side of the magnet block four (35) away from the upper top column (18) is magnetically connected to the magnet block one (32), the magnet block one (32) is fixedly mounted on the bottom surface of the end of the pawl two (30) away from the limiting column two (31).

4. The printer paper height limiting mechanism according to claim 1, wherein: A sliding groove (12) is provided on the surface of the bottom plate (11), and a connecting rod (8), a movable plate (13) and a connecting rod (29) are slidably installed inside the sliding groove (12).

5. The printer paper height limiting mechanism according to claim 1, wherein: A clamping plate (17) is fixedly mounted on the top of the movable plate (13), and a printing plate (36) is arranged inside the clamping plate (17).

6. The printer paper height limiting mechanism according to claim 1, wherein: A paper feeding box (2) is fixedly mounted on the side wall of the base (1); a paper feeding window (3) is provided on a side of the paper feeding box (2) close to the base (1); a rotating shaft (4) is rotatably mounted on the inner side wall of the paper feeding window (3); and a roller (5) is fixedly mounted on the outer wall of the rotating shaft (4).

7. The printer paper height limiting mechanism according to claim 6, wherein: The roller (5) is made of rubber, and the surface of the rubber is provided with an integrally formed anti-skid pattern.

8. The printer paper height limiting mechanism according to claim 6, wherein: A paper box (9) is provided at the bottom end of the side wall of the paper feeding box (2) away from the base (1), and a dustproof plate is provided on the outer wall of the paper box (9).

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