Linear pulling device for a printing head of a screen printing machine

Abstract

The application discloses a linear traction device of a printing head of a screen printing machine, which comprises a screw nut assembly and a linear guide rail assembly respectively installed on both sides of a support of the printing head, and further comprises a base plate and two clamping members; the base plate is fixedly connected to a sliding block; a nut and a nut support are clamped between the first clamping member and the second clamping member; a clamping block on the outer side of the nut support is correspondingly nested in a clamping groove of the first clamping member, and a first buffer pad providing a buffer effect in the up-down direction is arranged between the clamping block and the clamping groove; a second buffer pad providing a buffer effect in the left-right direction is arranged between the clamping surface of the second clamping member and the outer end surface of the nut; and the second clamping member can be adjusted in the installation position on the base plate in the left-right direction. The nut support and the sliding block are elastically buffered and clamped in multiple dimensions in the up-down and left-right directions through a specific clamping connection structure, the deformation of the screw rod is effectively avoided, the machining precision requirement and the assembly difficulty of the support of the printing head are greatly reduced, and the linear motion is ensured to be accurate, reliable and smooth.

Description

Technical Field

[0001] The invention relates to a linear traction device for a printing head of a screen printing machine. Background Art

[0002] The screen printing machine has a screen below the printing head, and the printing material below the screen. During printing, the printing head drives the scraper to move evenly from the inside to the outside on the screen. During the movement, the slurry is squeezed from the mesh of the screen by the scraper to the printing material, thus completing the printing. In order to accurately pull the printing head to complete the above-mentioned linear movement, existing equipment has linear traction devices on both sides of the bracket of the printing head. The linear traction device on each side includes a screw nut assembly and a guide rail slider assembly. Among them, the motor-driven screw nut assembly consists of a screw, a nut, and a nut support. The screw nut assemblies on both sides constitute a double screw drive mechanism to provide traction for the linear motion of the printing head; the linear motion guide component of the printing head adopts a screw nut assembly consisting of a guide rail and a slider; the nut support is fixedly connected and assembled with the slider.

[0003] However, the existing technology suffers from the difficulty of achieving absolute synchronization of the dual-screw motion due to machining precision and assembly errors. Often, the assembly tolerances for the screws can only be reasonably selected based on the screw drive force and system rigidity. The existing method of securing the nut support to the slider places high demands on the machining precision of the printer head bracket and the assembly precision of the equipment. Otherwise, the asynchronous movement of the dual-screws can cause the guide rail slider to act on the screw nut, causing deformation of the screw, affecting its operation and resulting in abnormal noise and wear. Summary of the Invention

[0004] In order to solve the above-mentioned drawbacks, the technical problem to be solved by the present invention is to provide a linear traction device for the printing head of a screen printing machine, which effectively reduces the processing accuracy requirements for the printing head bracket and the assembly accuracy requirements of the equipment. In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is a linear traction device for the printing head of a screen printing machine, comprising a screw nut assembly and a linear guide rail assembly respectively installed on both sides of the bracket of the printing head, the motor-driven screw nut assembly consisting of a screw, a nut, and a nut support, and the linear guide rail assembly consisting of a guide rail and a slider; the screw and the guide rail are arranged in parallel, and the present invention is characterized in that it also includes a base plate, a first clamping member, and a second clamping member;

[0005] The base plate is located between the screw nut assembly and the linear guide rail assembly, and the base plate is fixed to the slider;

[0006] The nut and the nut support are clamped between the first clamping member and the second clamping member; the brackets on both sides of the printing head are respectively fixedly connected to a nut support;

[0007] The first clamping member is fixedly mounted on the base plate near the outer side of the nut support. The first clamping member is provided with a slot. The outer side of the nut support is provided with a clamping block, which is correspondingly nested in the slot. The upper and lower side walls of the slot are respectively provided with first buffer pads made of elastic material to provide a buffering effect in the vertical direction. The upper and lower ends of the clamping block are correspondingly nested between the two first buffer pads of the slot.

[0008] The second clamping member is fixed on the substrate near the outside of the nut, and a second buffer pad made of elastic material is provided between the clamping surface of the second clamping member and the outer end surface of the nut to provide buffering effect in the left and right directions; the second clamping member is provided with a position adjustment member, which can adjust the installation position of the second clamping member on the substrate along the left and right directions.

[0009] The beneficial effect of the present invention lies in that, by adopting the above technical solution, the nut support is elastically clamped and fixed by two clamping parts to achieve connection with the slider, and elastic buffer clamping in multiple dimensions of up, down, left and right is achieved through a specific clamping structure, which can effectively absorb the adverse effects caused by the asynchronous movement of the double screws in all directions, greatly reduce the force of the guide rail slider on the screw nut, and effectively avoid the occurrence of screw deformation, thereby greatly reducing the processing accuracy requirements for the printing head bracket, and greatly reducing the assembly difficulty of the double-screw driven linear traction device, while ensuring the accurate, reliable and smooth linear movement of the printing head.

[0010] Preferably, the second clamping member wraps around the corner of the base plate and is secured to two adjacent sidewalls of the base plate corner using a first screw in the left-right direction and a second screw in the front-back direction. The second screws are secured to the base plate via waist-shaped grooves on the second clamping member. This provides a reliable and secure fixation, allowing for easy left-right adjustment of the second clamping member's position on the base plate. Furthermore, the second clamping member is secured to the base plate using two sets of waist-shaped grooves and a second screw, enhancing the stability of the adjustable installation.

[0011] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time.

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0013] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. When an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an intervening element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be an intervening element. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Fig. 1 A schematic diagram of the overall structure of a screen printing machine according to an embodiment;

[0015] Fig. 2 This is a schematic diagram of the overall structure of the combined connection of the lead screw nut assembly and the linear guide rail assembly;

[0016] Fig. 3 This is a schematic diagram of the overall structure of the combined connection of the screw nut assembly, the base plate, the first clamping member, and the second clamping member. DETAILED DESCRIPTION

[0017] See attached Figs. 1-3 , reflecting a specific structure of the present invention. In the screen printing machine, the screen is located below the printing head 4, and the substrate is located below the screen. During printing, the scraper of the printing head 4 moves evenly from the inside to the outside on the screen. During this movement, the slurry is squeezed from the mesh of the screen by the scraper onto the substrate, thus completing the printing. To achieve the above-mentioned movement of the printing head 4, the linear traction device of the screen printing machine printing head of the present invention is used, specifically:

[0018] The device includes a screw-nut assembly and a linear guide assembly, mounted on either side of a bracket 5 of a printing head 4. The motor-driven screw-nut assembly consists of a screw 201, a nut 202, and a nut support 203. Each bracket 5 on either side of the printing head 4 is fixedly connected to a nut support 203. The linear guide assembly consists of a guide rail 101 and a slider 102; the axes of the screw 201 and guide rail 101 are parallel.

[0019] The device further includes a base plate 301, a first clamping member 305, and a second clamping member 307;

[0020] The base plate 301 is located between the upper screw nut assembly and the lower linear guide rail assembly. In the example, the base plate 301 is fixed to the two sliders 102 to improve the stability and balance of the structure and ensure smooth sliding.

[0021] The nut 202 and the nut support 203 are clamped between a first clamping member 307 and a second clamping member 305 that are oppositely disposed.

[0022] The first clamping member 307 is fixed to the base plate 301 near the outside of the nut support 203 by bolts 302. The first clamping member 307 is provided with a slot 308. The outside of the nut support 203 is provided with a clamping block 204, which is correspondingly nested in the slot 308. A first buffer pad 303 made of rubber is provided between the clamping block 204 and the slot 308. The elasticity of the rubber provides a vertical buffering effect between the clamping block 204 and the slot 308. In this example, the first buffer pads 303 are respectively provided on the upper and lower side walls of the slot 307, and the upper and lower ends of the clamping block 204 are correspondingly nested between the two first buffer pads 303 in the slot 308. This conveniently and reliably achieves a vertical buffering effect.

[0023] The second clamping member 305 is fixed on the substrate 301 near the outer side of the nut 202, and a second buffer pad 304 made of rubber is provided between the clamping surface of the second clamping member 305 and the outer end surface of the nut 202. The second buffer pad 304 uses the elasticity of rubber to provide a left-right buffering effect between the clamping surface of the second clamping member 305 and the outer end surface of the nut 202.

[0024] The second clamping member 305 is provided with a position adjusting member, so that the installation position of the second clamping member 305 on the substrate 301 can be adjusted along the left-right direction.

[0025] In the above structure, the connection between the first clamping member 307 and the second clamping member 305 and the base plate 301 and the clamping and fixing of the nut 202 and the nut support 203 are firm and reliable, thereby ensuring a reliable connection between the nut support 203 and the slider 102.

[0026] In the example, the second clamping member 305 wraps around the corner portion of the substrate 301. A screw hole 309 and two waist-shaped holes 306 are provided on the second clamping member 305. The first screw in the left-right direction (i.e., the direction parallel to the screw axis) passes through the screw hole 309 to fix the second clamping member 305 on one side wall of the corner portion of the substrate 301; the second screw in the front-to-back direction (i.e., the direction perpendicular to the screw axis) passes through the waist-shaped hole 306 to fix the second clamping member 305 on the other side wall of the corner portion of the substrate 301. The second screw and waist-shaped groove 306 in the example are the position adjustment members. The fixation is reliable and firm, and the installation position of the second clamping member on the substrate can be easily adjusted along the left-right direction, and the stability of this adjustable installation can be improved.

[0027] By adopting the above technical solution, the nut 202 and the nut support 203 are no longer rigidly fixed to the base plate 301 and its slider 102. Instead, they are elastically clamped and fixed with two clamps to achieve connection. The elastic buffer clamping in multiple dimensions, up and down, left and right, can effectively absorb the adverse effects of the asynchronous movement of the double screws, greatly reduce the force of the guide rail slider assembly on the screw nut assembly, and effectively avoid the deformation of the screw 201. Therefore, the present invention can greatly reduce the processing accuracy requirements for the printing head bracket on the basis of ensuring the accurate, reliable and smooth linear movement of the printing head, and greatly reduce the assembly difficulty of the linear traction device driven by the double screws.

[0028] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made based on the contents of this specification. This specification selects and describes these embodiments in detail in conjunction with the accompanying drawings in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is only limited by the claims and their full scope and equivalents, and is not limited by the specific embodiments disclosed.

Claims

1. A linear traction device for a printing head of a screen printer, comprising a screw-nut assembly and a linear guide assembly respectively mounted on either side of a bracket of the printing head, wherein the motor-driven screw-nut assembly comprises a screw, a nut, and a nut support, and the linear guide assembly comprises a guide rail and a slider; the screw and guide rail are arranged in parallel, and characterized in that: Also includes a base plate, a first clamping member, and a second clamping member; The base plate is located between the screw nut assembly and the linear guide rail assembly, and the base plate is fixed to the slider; The nut and the nut support are clamped between the first clamping member and the second clamping member; the brackets on both sides of the printing head are respectively fixedly connected to a nut support; The first clamping member is fixedly mounted on the base plate near the outer side of the nut support. The first clamping member is provided with a slot. The outer side of the nut support is provided with a clamping block, which is correspondingly nested in the slot. The upper and lower side walls of the slot are respectively provided with first buffer pads made of elastic material to provide a buffering effect in the vertical direction. The upper and lower ends of the clamping block are correspondingly nested between the two first buffer pads of the slot. The second clamping member is fixedly mounted on the base plate near the outer side of the nut. A second buffer pad made of elastic material is provided between the clamping surface of the second clamping member and the outer end surface of the nut to provide a buffering effect in the left-right direction. The second clamping member is provided with a position adjustment member, which can adjust the installation position of the second clamping member on the base plate in the left-right direction. The second clamping member wraps around the corner portion of the substrate, and the second clamping member is fixed to two adjacent side walls of the corner portion of the substrate via a first screw in a left-right direction and a second screw in a front-back direction, and the second screw is fixed to the substrate via a waist-shaped groove on the second clamping member; In the screen printing machine, a screen is placed below the printing head, and a substrate is placed below the screen. During printing, a scraper of the printing head moves evenly from the inside to the outside on the screen. During the movement, the slurry is squeezed from the mesh of the screen by the scraper onto the substrate, thereby completing printing.

2. The linear traction device for the printing head of a screen printing machine according to claim 1, wherein: The second clamping member is fixed on the base plate through two sets of waist-shaped grooves and a second screw.

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