Paper feeding mechanism for printer

Abstract

The utility model discloses a paper feeding mechanism for a printer, and relates to the technical field of printers. A first rotating rod is rotatably inserted in the shell, sliding grooves are formed in the two sides of the shell, sliding blocks are movably inserted in the sliding grooves, the two sliding blocks are rotatably connected with a second rotating rod, a transmission rod is rotatably inserted in a fixing frame, and a transmission shaft is rotatably inserted in the sliding block located on one side of the fixing frame. The outer side of the transmission shaft is fixedly sleeved with a first bevel gear, and a second bevel gear is fixedly arranged at the end, close to the first bevel gear, of the second rotating rod. Through mutual cooperation of structures such as the fixing frame, the sliding block, the first bevel gear, the second bevel gear, the transmission rod and the transmission shaft, synchronous transmission can be carried out on the height-adjustable pressing wheel under the condition that a motor or a motor is not added, and the pressing wheel can be driven synchronously through synchronous rotation of the rolling wheel and the pressing wheel; and the paper can be prevented from being twisted or folded.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, and particularly relates to a paper feeding mechanism for a printer. Background Art

[0002] A printer is one of the output devices of a computer, and is used to print the processing results of the computer on relevant media. According to the adopted technology, printers can be divided into column printers, spherical printers, dot matrix printers, inkjet printers, thermal printers, laser printers, etc. A dot matrix printer is a special printer, which is very different from inkjet printers, laser printers, etc. It is mainly used for bill printing, card printing, multi-copy printing, etc., and serves some special industry users. The paper feeding mechanism of a dot matrix printer is mainly composed of a main drive shaft roller, a paper feeding motor, a screw rod, a pressure roller arranged on the screw rod, a guide paper board, a sensor (detecting whether there is paper), etc. The printing paper is pressed between the main drive shaft roller and the pressure roller, and the paper feeding motor drives the roller to rotate in the paper feeding direction. The printing paper rotates with the roller under the action of friction, so as to realize the paper feeding action.

[0003] The existing device can automatically adjust the position of the pressure roller according to the paper thickness and type of different papers. In order to reduce the noise caused by the motor or the motor, usually a motor is connected to the roller, and the pressure roller rotates in an auxiliary manner, which will cause phenomena such as twisting or folding of the paper during the paper feeding process, and it is not convenient to adjust the guiding transmission of the paper specifications. In view of the above problems, the inventor proposes a paper feeding mechanism for a printer to solve the above problems. Content of the Utility Model

[0004] In order to solve the problem that the paper is prone to twisting or folding; the purpose of the utility model is to provide a paper feeding mechanism for a printer.

[0005] To solve the above technical problems, the present utility model adopts the following technical solutions: A paper feeding mechanism for a printer, including a housing. A first rotating rod is rotatably inserted into the housing. Sliding grooves are provided on both sides of the housing. Sliding blocks are movably inserted into the sliding grooves. A second rotating rod is rotatably connected to the two sliding blocks. A fixing frame is installed outside the housing. A transmission rod is rotatably inserted into the fixing frame. A transmission shaft is rotatably inserted into the sliding block on one side of the fixing frame. A first bevel gear is fixedly sleeved outside the transmission shaft. A second bevel gear is fixedly provided at one end of the second rotating rod close to the first bevel gear. The first bevel gear and the second bevel gear are meshed with each other. A roller is installed outside the first rotating rod. A pressing wheel is installed outside the second rotating rod. A third bevel gear is fixedly sleeved outside the transmission rod. A fourth bevel gear is fixedly provided at one end of the first rotating rod close to the fixing frame. The third bevel gear and the fourth bevel gear are meshed with each other. Symmetrically distributed grooves are provided on the outside of the transmission rod. The transmission shaft is movably inserted into the grooves.

[0006] Preferably, a bidirectional threaded rod is rotatably provided in the housing. Symmetrically distributed moving frames are threadedly sleeved outside the bidirectional threaded rod. The moving frames are movably inserted into the housing. Guide plates are fixedly provided at both ends of the two moving frames. Guide grooves are provided on the inner wall of the housing in a rectangular array distribution. The four guide plates are respectively inserted into the guide grooves in an interactive manner. A second motor is installed outside the housing. The end of the output shaft of the second motor penetrates and is inserted into the housing and is fixedly connected to the bidirectional threaded rod.

[0007] Preferably, a fixing plate is fixedly provided on the inner wall of the housing. An electric cylinder is installed at the top of the fixing plate; U-shaped plates are fixedly connected to the tops of the two sliding blocks. The output end of the electric cylinder penetrates and is inserted into the fixing plate and is fixedly connected to the U-shaped plate; Auxiliary rods are fixedly provided at the top of the U-shaped plate in a symmetric distribution. The auxiliary rods are movably inserted into the fixing plate.

[0008] Preferably, a protective plate is fixedly provided outside the housing. A paper inlet is provided outside the housing; A first motor is fixedly provided at the top of the fixing frame. The end of the output shaft of the first motor penetrates and is inserted into the fixing frame and is fixedly connected to the transmission rod; Installation blocks are fixedly provided on both sides outside the housing.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0010] 1. In the present utility model, by setting structures such as a fixing frame, a sliding block, a first bevel gear, a second bevel gear, a transmission rod and a transmission shaft to cooperate with each other, the height-adjustable pressing wheel can be synchronously driven without adding a motor or a motor. By the synchronous rotation of the roller and the pressing wheel, phenomena such as paper distortion or folding can be avoided;

[0011] 2. In the present utility model, by arranging structures such as a bidirectional threaded rod, a moving frame, a guide plate, and a guide groove to cooperate with each other, the guide plate can be adjusted and moved according to the size of the paper, assisting in guiding the paper, so as to facilitate the purpose of adjusting and guiding the paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Figure 1 Schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 Schematic side view of the overall structure of the present utility model;

[0015] Figure 3 Schematic cross-sectional view of the housing and its connection structure of the present utility model;

[0016] Figure 4 For the present utility model Figure 3 Schematic enlarged view of the structure at A in;

[0017] Figure 5 For the present utility model Figure 3 Schematic enlarged view of the structure at B in.

[0018] In the figure: 1. Housing; 11. First rotating rod; 12. Roller; 13. Sliding groove; 14. Sliding block; 15. Second rotating rod; 16. Pressing wheel; 17. Mounting block; 18. Paper inlet; 19. Protection plate; 2. Fixed plate; 21. Electric cylinder; 22. U-shaped plate; 23. Auxiliary rod; 3. Fixed frame; 31. Transmission rod; 32. Transmission shaft; 33. First bevel gear; 34. Second bevel gear; 35. Third bevel gear; 36. Fourth bevel gear; 37. First motor; 4. Bidirectional threaded rod; 41. Moving frame; 42. Guide plate; 43. Guide groove; 44. Second motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment: As Figures 1-5 shown, the present invention provides a paper feeding mechanism for a printer, including a housing 1. A first rotating rod 11 is rotatably inserted into the housing 1. Sliding grooves 13 are opened on both sides of the housing 1. A sliding block 14 is movably inserted into the sliding groove 13. The two sliding blocks 14 are rotatably connected to a second rotating rod 15. A fixing frame 3 is installed outside the housing 1. A transmission rod 31 is rotatably inserted into the fixing frame 3. A transmission shaft 32 is rotatably inserted into the sliding block 14 on one side of the fixing frame 3. The transmission shaft 32 can move on the transmission rod 31. At the same time, the transmission rod 31 can drive the transmission shaft 32 to rotate. A first bevel gear 33 is fixedly sleeved outside the transmission shaft 32. A second bevel gear 34 is fixedly provided at one end of the second rotating rod 15 close to the first bevel gear 33, so that the rotation of the first bevel gear 33 drives the rotation of the second bevel gear 34. The first bevel gear 33 and the second bevel gear 34 are meshed with each other; a roller 12 is installed outside the first rotating rod 11, and a pressing wheel 16 is installed outside the second rotating rod 15. The paper can be conveyed by the roller 12 and the pressing wheel 16. A third bevel gear 35 is fixedly sleeved outside the transmission rod 31. A fourth bevel gear 36 is fixedly provided at one end of the first rotating rod 11 close to the fixing frame 3. A third bevel gear 35 is fixedly sleeved outside the transmission rod 31. The third bevel gear 35 and the fourth bevel gear 36 are meshed with each other. The rotation of the third bevel gear 35 drives the rotation of the fourth bevel gear 36. Symmetrically distributed grooves are opened on the outside of the transmission rod 31. The transmission shaft 32 is movably inserted into the grooves. Through the grooves, the transmission shaft 32 can move outside the transmission rod 31, and the transmission rod 31 drives the transmission shaft 32 to move.

[0021] A bidirectional threaded rod 4 is rotatably provided in the housing 1. Symmetrically distributed moving frames 41 are threadedly sleeved outside the bidirectional threaded rod 4. The moving frames 41 are movably inserted into the housing 1. Guide plates 42 are fixedly provided at both ends of the two moving frames 41. Guide grooves 43 are opened on the inner wall of the housing 1 in a rectangular array distribution. The four guide plates 42 are respectively inserted into the guide grooves 43 in an interactive manner. A second motor 44 is installed outside the housing 1. The end of the output shaft of the second motor 44 penetrates and is inserted into the housing 1 and is fixedly connected to the bidirectional threaded rod 4.

[0022] By adopting the above technical solution, the movement of the moving frame 41 drives the guide plate 42 to move with the assistance of the guide groove 43, so as to facilitate the purpose of adjusting and guiding the paper.

[0023] On the inner wall of the housing 1, a fixed plate 2 is fixedly provided, and an electric cylinder 21 is installed at the top of the fixed plate 2.

[0024] By adopting the above technical solution, the fixed plate 2 is used for fixing and supporting, and the output end of the electric cylinder 21 drives the U-shaped plate 22 to adjust the height.

[0025] At the top of the two sliding blocks 14, a U-shaped plate 22 is fixedly connected, and the output end of the electric cylinder 21 penetrates and is inserted into the fixed plate 2 and is fixedly connected to the U-shaped plate 22.

[0026] By adopting the above technical solution, the height of the U-shaped plate 22 is adjusted, so that the distance between the pressing wheel 16 and the roller 12 can be adjusted, which is convenient for adjusting according to the type of paper.

[0027] At the top of the U-shaped plate 22, symmetrically distributed auxiliary rods 23 are fixedly provided, and the auxiliary rods 23 are movably inserted into the fixed plate 2.

[0028] By adopting the above technical solution, the auxiliary rods 23 assist the U-shaped plate 22 to move.

[0029] A protective plate 19 is fixedly provided on the outside of the housing 1, and a paper inlet 18 is provided on the outside of the housing 1.

[0030] By adopting the above technical solution, the protective plate 19 is used for protection, and the paper inlet 18 is convenient for transmitting paper into the device.

[0031] At the top of the fixing frame 3, a first motor 37 is fixedly provided, and the output end of the first motor 37 penetrates and is inserted into the fixing frame 3 and is fixedly connected to the transmission rod 31.

[0032] By adopting the above technical solution, the end of the output shaft of the first motor 37 rotates to drive the transmission rod 31 to rotate.

[0033] Mounting blocks 17 are fixedly provided on both sides outside the housing 1.

[0034] By adopting the above technical solution, the mounting blocks 17 facilitate the installation and connection of the device.

[0035] Working principle: First, the paper can be guided and adjusted according to the specified width of the paper used. At this time, the second motor 44 is started, so that the second motor 44 starts to work. The end of the output shaft of the second motor 44 rotates to drive the bidirectional threaded rod 4 to rotate. The rotation of the bidirectional threaded rod 4 drives the two moving frames 41 to move in opposite directions. The movement of the moving frame 41 drives the guide plate 42 to move with the assistance of the guide groove 43, so as to facilitate the purpose of guiding and adjusting the paper. Then, according to the thickness and type of the paper, the distance between the pressure wheel 16 and the roller 12 is adjusted. The electric cylinder 21 is started, so that the output end of the electric cylinder 21 drives the U-shaped plate 22 to move up and down with the assistance of the sliding block 14 and the sliding groove 13, and thus the height of the pressure wheel 16 can be adjusted. Therefore, the distance between the pressure wheel 16 and the roller 12 can be adjusted according to the type of the paper. During the movement of the sliding block 14, the transmission shaft 32 moves outside the transmission rod 31 through the groove. When the paper enters the housing 1 through the paper inlet 18, the first motor 37 is started, so that the first motor 37 starts to work. The first motor 37 starts to work, and the end of the output shaft of the first motor 37 rotates to drive the transmission rod 31 to rotate. The rotation of the transmission rod 31 drives the transmission shaft 32 to rotate through the groove. The rotation of the transmission shaft 32 drives the first bevel gear 33 to rotate. The rotation of the first bevel gear 33 drives the meshing second bevel gear 34 to rotate. The rotation of the second bevel gear 34 drives the pressure wheel 16 to rotate through the second rotating rod 15. At the same time, the rotation of the transmission rod 31 drives the third bevel gear 35 to rotate. The rotation of the third bevel gear 35 drives the meshing fourth bevel gear 36 to rotate. The rotation of the fourth bevel gear 36 drives the roller 12 to rotate through the first rotating rod 11. By the synchronous rotation of the roller 12 and the pressure wheel 16, it is possible to avoid phenomena such as distortion or folding of the paper during the transmission process.

[0036] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A paper feeding mechanism for a printer, comprising a housing (1), characterized in that: A first rotating rod (11) is rotatably inserted in the shell (1), sliding grooves (13) are provided on both sides of the shell (1), sliding blocks (14) are movably inserted in the sliding grooves (13), and two sliding blocks (14) are rotatably connected to a second rotating rod (15). A fixing frame (3) is installed on the outside of the shell (1), a transmission rod (31) is rotatably inserted in the fixing frame (3), a transmission shaft (32) is rotatably inserted in the sliding block (14) located on one side of the fixing frame (3), a first bevel gear (33) is fixedly sleeved on the outside of the transmission shaft (32), and a second bevel gear (34) is fixedly provided on one end of the second rotating rod (15) close to the first bevel gear (33), and the first bevel gear (33) and the second bevel gear (34) are meshed with each other; A roller (12) is installed on the outer side of the first rotating rod (11), a pressure wheel (16) is installed on the outer side of the second rotating rod (15), a third bevel gear (35) is fixedly provided on the outer side of the transmission rod (31), a fourth bevel gear (36) is fixedly provided on one end of the first rotating rod (11) close to the fixed frame (3), a third bevel gear (35) is fixedly provided on the outer side of the transmission rod (31), the third bevel gear (35) and the fourth bevel gear (36) are meshed with each other, and symmetrically distributed grooves are opened on the outer side of the transmission rod (31), and the transmission shaft (32) is movably inserted in the grooves.

2. A paper feeding mechanism for a printer as claimed in claim 1, characterized in that: A bidirectional threaded rod (4) is rotatably arranged in the shell (1), and a symmetrically distributed movable frame (41) is threadedly sleeved on the outer side of the bidirectional threaded rod (4), and the movable frame (41) is movably inserted in the shell (1), and guide plates (42) are fixedly arranged at both ends of the two movable frames (41). The inner wall of the shell (1) is provided with guide grooves (43) distributed in a rectangular array, and the four guide plates (42) are interactively inserted in the guide grooves (43) respectively. A second motor (44) is installed on the outer side of the shell (1), and the output shaft end of the second motor (44) is inserted through the shell (1) and fixedly connected to the bidirectional threaded rod (4).

3. A paper feeding mechanism for a printer as claimed in claim 1, characterized in that: A fixing plate (2) is fixedly provided on the inner wall of the housing (1), and an electric cylinder (21) is installed on the top end of the fixing plate (2).

4. A paper feeding mechanism for a printer as claimed in claim 3, characterized in that: The top ends of the two sliding blocks (14) are fixedly connected to a U-shaped plate (22), and the output end of the electric cylinder (21) is inserted through the fixed plate (2) and fixedly connected to the U-shaped plate (22).

5. A paper feeding mechanism for a printer as claimed in claim 4, characterized in that: Auxiliary rods (23) which are symmetrically distributed are fixedly provided on the top of the U-shaped plate (22), and the auxiliary rods (23) are movably inserted in the fixed plate (2).

6. A paper feeding mechanism for a printer as claimed in claim 1, characterized in that: A protective plate (19) is fixedly provided on the outer side of the shell (1), and a paper feed port (18) is provided on the outer side of the shell (1).

7. A paper feeding mechanism for a printer as claimed in claim 1, characterized in that: A No. 1 motor (37) is fixedly disposed on the top of the fixing frame (3); an output end of the No. 1 motor (37) is inserted through the fixing frame (3) and is fixedly connected to the transmission rod (31).

8. A paper feeding mechanism for a printer as claimed in claim 1, characterized in that: Mounting blocks (17) are fixedly provided on both sides of the outer side of the shell (1).

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