Gear and rack off-grid mechanism

Abstract

The utility model relates to a gear rack off-screen mechanism, which belongs to the technical field of printing, and comprises a printing screen plate, a driven lifting mechanism and a driving lifting mechanism, the printing screen plate is driven by the driven lifting mechanism and the driving lifting mechanism to lift, and each of the driven lifting mechanism and the driving lifting mechanism comprises a fixed table and two lifting rods which are symmetrically and movably connected to the fixed table. Synchronous off-grid can be achieved through one servo motor, digital control and arbitrary adjustment of off-grid height and speed can be conveniently achieved, two-end synchronization can be achieved due to the fact that two sets of gears are adopted, the gears and the racks are transversely installed, the overall height occupation is small, and the space layout is reasonable and attractive.

Description

Technical Field

[0001] The present application relates to the technical field of printing, and in particular to a rack and pinion off-grid mechanism. Background Art

[0002] Screen printing is a type of stencil printing, which, along with lithography, letterpress, and gravure, is considered one of the four major printing methods. Stencil printing includes copy plates, perforated plates, spray-painted plates, and screen printing. The principle of stencil printing is as follows: During printing, a certain pressure is applied to a printing plate (a paper film plate or other plate base with holes through which ink can pass) to transfer ink through the holes of the stencil to the substrate (paper, ceramic, etc.), forming an image or text. During printing, a scraper is applied to squeeze the ink through the mesh of the graphic portion and transfer it to the substrate, creating an image or text that is identical to the original. Screen printing equipment is simple and easy to operate, and printing and platemaking are simple and inexpensive. Its adaptability makes it widely applicable. Common printed products include: color paintings, posters, business cards, book covers, product labels, and printed and dyed textiles.

[0003] In the existing technology, cylinder off-grid or servo motor plus ball screw off-grid methods are generally used. Cylinder off-grid cannot achieve digital control, and the position and speed of the printing screen cannot be set. The servo motor plus ball screw off-grid method, although it can digitally control and set the height and speed, but the synchronization effect of the two ends of the printing screen is poor. At the same time, the screw is vertical, resulting in the overall off-grid mechanism needing to occupy a higher space, affecting the spatial layout. Utility Model Content

[0004] The purpose of this application is to provide a rack and pinion off-grid mechanism to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present application provides a rack and pinion off-grid mechanism adopting the following technical solutions:

[0006] A rack and pinion off-grid mechanism comprises a printing screen, a driven lifting mechanism and an active lifting mechanism, wherein the printing screen is driven and lifted by the driven and active lifting mechanisms, and each of the driven and active lifting mechanisms comprises a fixed platform and two lifting rods symmetrically and movably connected to the fixed platform;

[0007] A driving assembly is also installed on the active lifting mechanism, and the lifting rod in the active lifting mechanism is evenly provided with a number of tooth grooves. The driving assembly includes a servo motor and a synchronous shaft. The servo motor is fixed to the side of the fixed platform. The synchronous shaft is rotatably arranged on the fixed platform. A driven gear is fixed to the middle of the synchronous shaft, and driving gears are fixed to both ends of the synchronous shaft. The driving gear is engaged with the tooth grooves of the lifting rod. A driving gear is fixed to the output end of the servo motor, and the driving gear is engaged with the driven gear.

[0008] A connecting rod is fixed between the lifting rods on both sides.

[0009] A circular joint is fixed on the top end of the lifting rod, and the lifting rod is hinged on the printing screen via the circular joint.

[0010] Preferably, in order to protect the gears, protective covers are provided at the positions of the driven gear, the driving gear and the active gear in the active lifting mechanism.

[0011] Preferably, a guide sleeve is fixed to the bottom end of the fixed platform at a position corresponding to the lifting rod.

[0012] By adopting the above technical solution, the setting of the guide sleeve can make the lifting rod as a whole confined in a guide channel during the lifting process, ensuring that it can always move up and down in a straight line.

[0013] In summary, this application includes at least one of the following beneficial technical effects:

[0014] 1. The rack and pinion off-grid mechanism can achieve synchronous off-grid operation through a servo motor, which is convenient for digital control. The off-grid height and speed can be adjusted arbitrarily. In addition, due to the use of two sets of gears, synchronization between the two ends can be achieved.

[0015] 2. The gear rack is installed horizontally, the overall height is small, the space layout is more reasonable and more beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0017] Figure 2 It is a structural schematic diagram of the embodiment of the present application from different perspectives.

[0018] Explanation of the accompanying symbols: 1. Printing screen; 2. Driven lifting mechanism; 3. Active lifting mechanism; 4. Fixed platform; 5. Lifting rod; 51. Tooth groove; 6. Connecting rod; 7. Servo motor; 71. Driving gear; 8. Synchronous shaft; 81. Driven gear; 82. Driving gear; 9. Guide sleeve. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-2 This application is described in further detail.

[0020] The present application discloses a rack and pinion off-grid mechanism. Figure 1-2, including a printing screen 1, a driven lifting mechanism 2 and an active lifting mechanism 3. The printing screen 1 is driven and lifted by the driven lifting mechanism 2 and the active lifting mechanism 3. The driven lifting mechanism 2 and the active lifting mechanism 3 each include a fixed platform 4 and two lifting rods 5 symmetrically and movably connected to the fixed platform 4. In order to improve the overall connection stability between the printing screen 1 and the lifting plate, a connecting rod 6 is fixed between the lifting rods 5 on both sides, and a circular joint is fixed to the top of the lifting rod 5. The lifting rod 5 is hinged to the printing screen 1 via the circular joint;

[0021] A driving assembly is also installed on the active lifting mechanism 3, and the lifting rod 5 in the active lifting mechanism 3 is evenly provided with a number of tooth grooves 51. The driving assembly includes a servo motor 7 and a synchronous shaft 8. The servo motor 7 is fixed to the side of the fixed platform 4, and the synchronous shaft 8 is rotatably set on the fixed platform 4. A driven gear 81 is fixed to the middle of the synchronous shaft 8, and driving gears 82 are fixed at both ends of the synchronous shaft 8. The driving gear 82 is engaged with the tooth grooves 51 of the lifting rod 5. The output end of the servo motor 7 is fixed with a driving gear 71, and the driving gear 71 is engaged with the driven gear 81.

[0022] Reference Figure 1 In order to protect the gears, protective covers are provided at the positions of the driven gear 81, the driving gear 82 and the active gear 71 in the active lifting mechanism 3.

[0023] Reference Figure 1 A guide sleeve 9 is fixed at the bottom end of the fixed platform 4 corresponding to the position of the lifting rod 5. The setting of the guide sleeve 9 can make the lifting rod 5 as a whole confined in a guide channel during the lifting process, ensuring that it can always move up and down in a straight line.

[0024] The implementation principle of a rack and pinion off-grid mechanism in the embodiment of the present application is as follows:

[0025] After printing is completed, the servo motor 7 drives the synchronous shaft 8 to rotate through the driving gear 71 and the driven gear 81. The driving gears 82 at both ends of the synchronous shaft 8 drive the lifting rod 5 to move upward, thereby driving the printing screen 1 to lift up. In this process, because two sets of gears are used, synchronization of the two ends can be achieved, and synchronous off-grid operation can be achieved through a servo motor 7. Digital control, off-grid height, and speed can be adjusted arbitrarily.

[0026] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A rack and pinion off-grid mechanism, characterized by: The invention comprises a printing screen (1), a driven lifting mechanism (2) and an active lifting mechanism (3), wherein the printing screen (1) is driven to be lifted and lowered by the driven lifting mechanism (2) and the active lifting mechanism (3), and the driven lifting mechanism (2) and the active lifting mechanism (3) both comprise a fixed platform (4) and two lifting rods (5) symmetrically and movably connected to the fixed platform (4). The active lifting mechanism (3) is further provided with a driving assembly, and the lifting rod (5) in the active lifting mechanism (3) is evenly provided with a plurality of tooth grooves (51). The driving assembly comprises a servo motor (7) and a synchronous shaft (8). The servo motor (7) is fixed to the side of the fixed platform (4). The synchronous shaft (8) is rotatably arranged on the fixed platform (4). A driven gear (81) is fixed to the middle of the synchronous shaft (8). Drive gears (82) are fixed to both ends of the synchronous shaft (8). The drive gear (82) is meshed with the tooth grooves (51) of the lifting rod (5). A driving gear (71) is fixed to the output end of the servo motor (7). The driving gear (71) is meshed with the driven gear (81).

2. The rack and pinion off-grid mechanism according to claim 1, characterized in that: A connecting rod (6) is fixed between the lifting rods (5) on both sides.

3. The rack and pinion off-grid mechanism according to claim 1, characterized in that: A circular joint is fixed to the top end of the lifting rod (5), and the lifting rod (5) is hinged to the printing screen (1) via the circular joint.

4. The rack and pinion off-grid mechanism according to claim 1, characterized in that: Protective covers are provided at the positions of the driven gear (81), the driving gear (82) and the driving gear (71) in the active lifting mechanism (3).

5. The rack and pinion off-grid mechanism according to claim 1, characterized in that: A guide sleeve (9) is fixed at the bottom end of the fixed platform (4) at a position corresponding to the lifting rod (5).

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