Printing apparatus

Abstract

A printing device is used for printing ink and comprises a guide rail, a driving assembly and a roller assembly. The guide rail is arranged along a first direction; one end of the driving assembly is connected with the guide rail and can move in the first direction. The roller assembly comprises an air bag, a gauze and a sleeve. The axial direction of the air bag is a second direction, and the second direction is perpendicular to the first direction; the gauze sleeves the air bag, the gauze and the air bag are arranged at intervals to form an ink bin, the ink bin is rotationally connected with the air bag, and the ink bin is used for containing ink; the sleeve sleeves the surface of the gauze, an opening is formed in the sleeve, and the other end of the driving assembly is relatively fixed with the air bag; when the driving assembly drives the roller assembly to move in the first direction, the sleeve and the gauze rotate with the second direction as a rotating shaft, the size of the air bag can be changed, and the air bag is used for squeezing the ink and enabling the ink to penetrate through the gauze and the opening so as to print the ink.

Description

Technical Field

[0001] The present application relates to the technical field of ink printing, and in particular to a printing device. Background Art

[0002] During the production of circuit boards, printing ink is required to form a solder mask on the surface of the circuit board. The existing printing ink process usually uses a combination of a scraper and a mesh cloth for printing. This printing method has many variables, the thickness of the printed ink varies greatly, and the uniformity of the formed solder mask is poor. Utility Model Content

[0003] In view of this, it is necessary to provide a printing device with small difference in the thickness of printed ink to solve the above problems.

[0004] A printing device for printing ink, the printing device comprising a guide rail, a driving assembly and a roller assembly. The guide rail is arranged along a first direction; one end of the driving assembly is connected to the guide rail and can move along the first direction; the roller assembly comprises an airbag, a mesh and a sleeve. The axial direction of the airbag is a second direction, and the second direction is perpendicular to the first direction; the mesh is sleeved on the airbag, and the mesh and the airbag are arranged at intervals to form an ink tank and is rotatably connected to the airbag, and the ink tank is used to contain ink; the sleeve is sleeved on the surface of the mesh, and the sleeve has an opening, and the other end of the driving assembly is relatively fixed to the airbag; wherein, when the driving assembly drives the roller assembly to move along the first direction, the sleeve and the mesh rotate with the second direction as the rotation axis, and the volume of the airbag can change, which is used to squeeze the ink and allow the ink to pass through the mesh and the opening to print the ink.

[0005] In some embodiments of the present application, the roller assembly further includes two protective covers, which are disposed at the ends of the airbag and the mesh, and the protective covers are fixedly connected to the airbag, and are used to seal the ink tank.

[0006] In some embodiments of the present application, the roller assembly also includes a scraper, which includes a scraping part and two connecting parts. The two connecting parts are arranged at both ends of the scraping part and are fixedly connected to the protective cover. The scraping part extends along the second direction and is arranged between the airbag and the mesh and is supported against the inner surface of the mesh.

[0007] In some embodiments of the present application, the scraping and pressing portion includes a scraping and pressing surface arranged along the second direction, and the angle between the scraping and pressing surface and the first direction is an acute angle.

[0008] In some embodiments of the present application, the printing device further comprises a bearing, wherein the bearing connects the protective cover and the sleeve, and the bearing enables the sleeve to rotate relative to the airbag.

[0009] In some embodiments of the present application, the bearing includes a fixed portion and a rotating portion, the rotating portion can rotate relative to the fixed portion, the fixed portion is fixedly connected to the protective cover, and the rotating portion is relatively fixed to the sleeve.

[0010] In some embodiments of the present application, the printing device further includes a blower, which is connected to the airbag and is used to provide air pressure to the airbag.

[0011] In some embodiments of the present application, a guide groove is provided on the guide rail, and the guide groove extends along a first direction; the driving assembly includes a motor and a guide rod, the guide rod is fixedly connected to the motor, and the end of the guide rod facing away from the motor is rotatably connected to the sleeve, and the motor has a protrusion, which can be received in the guide groove and can move in the guide groove along the first direction.

[0012] In some embodiments of the present application, the printing device further includes a charge coupled device, and the charge coupled device is used to feed back position information of a substrate to be printed to a processor.

[0013] In some embodiments of the present application, the sleeve is made of polytetrafluoroethylene.

[0014] The printing device provided in the embodiment of the present application includes a guide rail, a driving assembly and a roller assembly. The driving assembly drives the roller assembly to move along the direction in which the guide rail is set, and at the same time, the mesh and sleeve in the roller assembly can rotate relative to the airbag to achieve ink printing. The thickness of the printed ink can be controlled by the pressure of the airbag and the moving speed of the driving assembly. Compared with the related art, the variables affecting the ink printing are effectively reduced, thereby effectively improving the quality of the formed solder mask and reducing the difficulty of operation; and the ink is contained in the ink tank formed between the mesh and the airbag, which can slow down the change of the ink viscosity and improve the ink printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of ink printing provided for related technology.

[0016] Figure 2 A schematic diagram of the structure of printing ink for a printing device provided in an embodiment of the present application.

[0017] Figure 3 An exploded schematic diagram of the roller assembly provided in an embodiment of the present application.

[0018] Main component symbols

[0019]

[0020] DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this article are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes all and any combination of one or more related listed items.

[0023] In the embodiments of the present application, for the convenience of description and not to limit the present application, the term "connection" used in the patent application specification and claims of the present application is not limited to physical or mechanical connection, whether direct or indirect. "Up", "down", "above", "below", "left", "right", etc. are only used to indicate relative position relationship. When the absolute position of the described object changes, the relative position relationship also changes accordingly.

[0024] See also Figure 1 In the related art, a solder mask is formed by combining a scraper 14a and a mesh 13a (not shown). Specifically, a substrate 12a is placed on a workbench 11a, and a mesh 13a is placed above the substrate 12a and spaced apart from the substrate 12a; ink 15a is placed on the surface of the mesh 13a away from the substrate 12a, and an opening (not shown) is provided on the mesh 13a so that the ink 15a passes through the mesh 13a; a scraper 14a is placed on one side of the ink 15a and moves along a moving direction L, and the scraper 14a drives the ink 15a to move and squeezes the ink 15a through the opening to form a solder mask on the substrate 12a.

[0025] The influencing parameters in the above-mentioned printing method at least include the pressure acting on the scraper 14a, the angle of the scraper 14a relative to the moving direction L, the moving speed of the scraper 14a, the depth of the downward pressure of the scraper 14a, the tension of the mesh 13a, the mesh number of the mesh 13a, the distance between the mesh 13a and the substrate 12a, etc. The above-mentioned factors can affect the quality of the formed solder mask; too many variables lead to increased difficulty in operation; in addition, during continuous printing, the deformation of the scraper 14a is likely to increase, and the ink 15a is exposed to the air, and the viscosity will change, which will cause the thickness of the formed solder mask to change.

[0026] See also Figure 2This embodiment provides a printing device 100, which may include a guide rail 20, a driving assembly 30 and a roller assembly 40. The driving assembly 30 drives the roller assembly 40 to roll along the direction of the guide rail 20 to form a solder mask 16 after printing ink on the substrate 12, which can effectively reduce variables and thus improve the ink printing quality. The substrate 12 may be a circuit substrate or other product that requires printing ink.

[0027] The guide rail 20 is disposed along the first direction L1 . A guide groove 21 is formed on the guide rail 20 . The guide groove 21 extends along the first direction L1 , so as to guide the driving assembly 30 along the first direction L1 .

[0028] The driving assembly 30 may include a motor 33 and a guide rod 31. The motor 33 is fixedly connected to the guide rod 31. The motor 33 has a protrusion 312. The protrusion 312 can be received in the guide groove 21 and can move along the first direction L1 in the guide groove 21, thereby driving the guide rod 31 and the motor 33 to move synchronously along the first direction L1.

[0029] The motor 33 may be electrically connected to the processor 50 , and the processor 50 may control the rotation time, rotation speed, etc. of the motor 33 .

[0030] Please also read Figure 3 The roller assembly 40 may include an airbag 41, a mesh 42 and a sleeve 43. The airbag 41, the mesh 42 and the sleeve 43 are all coaxially arranged along the second direction L2, and the second direction L2 is perpendicular to the first direction L1. The mesh 42 is sleeved on the airbag 41, and is spaced apart from the airbag 41 and rotates relatively. An ink tank (not shown) is formed between the airbag 41 and the mesh 42. The ink tank is used to contain ink, which can reduce the contact between the ink and the air and slow down the change in the viscosity of the ink. The sleeve 43 is sleeved on the outer surface of the mesh 42, and the sleeve 43 and the mesh 42 can rotate synchronously relative to the airbag 41. The sleeve 43 is provided with an opening 432 of a preset shape, and the shape and position of the opening 432 match the shape and position of the solder mask 16 to be formed.

[0031] The sleeve 43 is made of polytetrafluoroethylene, which has a low friction coefficient and can prevent the sleeve 43 from crushing the substrate 12 .

[0032] The end of the guide rod 31 facing away from the motor 33 is fixedly connected to the airbag 41, and is rotatably connected to the mesh 42 and the sleeve 43. It should be noted that fixed connection means that the two elements can be relatively fixed, and the two elements can be directly connected or indirectly connected through other elements; rotational connection means that the two elements can rotate relative to each other, and the two elements can be directly connected or indirectly connected through other elements. When the guide rod 31 moves along the first direction L1, it drives the roller assembly 40 to move along the first direction L1 and drives the sleeve 43 and the mesh 42 to rotate with the second direction L2 as the rotation axis; the volume of the airbag 41 can change, which is used to squeeze the ink and allow the ink to pass through the mesh 42 and the opening 432 of the sleeve 43 in turn.

[0033] The roller assembly 40 may further include two protective covers 45 , which are disposed at the ends of the airbag 41 and the mesh 42 to dispose the ink between the airbag 41 and the mesh 42 . The protective covers 45 are detachably connected to the airbag 41 and the mesh 42 .

[0034] Each protective cover 45 may include a sealing portion 452 and an extension portion 454. The sealing portion 452 is circular in shape, and the diameter of the sealing portion 452 is greater than the diameter of the airbag 41. The diameter of the sealing portion 452 is greater than or equal to the diameter of the mesh 42, so as to seal the ink between the airbag 41 and the mesh 42. The extension portion 454 is located on the surface of the sealing portion 452 away from the airbag 41 and the mesh 42, and is used to connect with other components.

[0035] The roller assembly 40 may further include a bearing 46, the bearing 46 connecting the protective cover 45 and the sleeve 43, and the bearing 46 is used to enable the sleeve 43 to rotate relative to the airbag 41. Specifically, the bearing 46 may include a fixed portion (not shown) and a rotating portion (not shown), and the rotating portion may rotate relative to the fixed portion. The fixed portion may be sleeved on the extension portion 454, and the fixed portion is fixedly connected to the protective cover 45; the rotating portion is fixedly connected to the sleeve 43. When printing ink is required, the roller assembly 40 contacts the substrate 12, and at the same time, when the motor 33 drives the guide rod 31 to move along the first direction L1, the guide rod 31 drives the roller assembly 40 to move along the first direction L1 through the protective cover 45. Since there is friction between the sleeve 43 and the substrate 12 and the bearing 46 rotatably connects the protective cover 45 and the sleeve 43, the sleeve 43 can rotate relative to the protective cover 45, so that ink can be printed on the substrate 12.

[0036] The roller assembly 40 also includes a scraper 44, which includes a scraping and pressing portion 442 and two connecting portions 444. The connecting portions 444 are arranged at both ends of the scraping and pressing portion 442, and one connecting portion 444 is connected to an extending portion 454. The scraper 44 is relatively fixed to the airbag 41. The scraping and pressing portion 442 extends along the second direction L2, and is arranged between the airbag 41 and the mesh 42. The scraping and pressing portion 442 is pressed against the inner surface of the mesh 42. During the process of printing ink, the mesh 42 rotates relative to the scraper 44, and the scraping and pressing portion 442 can make the ink attached to the mesh 42 more uniform, thereby making the ink passing through the mesh 42 more uniform. By controlling the pressure of the airbag 41, the depth of the scraper 44 pressing the mesh 42 can be controlled, so that the amount of ink output can be controlled.

[0037] The scraping portion 442 includes a scraping surface (not marked in the figure), which is arranged along the second direction L2. The angle between the scraping surface and the first direction L1 is an acute angle, so that the scraper 44 can slide relative to the mesh 42 more smoothly, which is beneficial to improving the uniformity of the ink passing through the mesh 42.

[0038] The printing device 100 further includes a blower (not shown), which is connected to the airbag 41 and is used to provide air pressure to the airbag 41 so that the volume of the airbag 41 changes, thereby enabling the airbag 41 to squeeze ink. The printing device 100 may also include a boost valve (not shown) and a frequency converter (not shown), which are connected to the blower and are used to change the air pressure provided by the blower to the airbag 41. The blower and the frequency converter may be electrically connected to the processor 50, and the processor 50 may control the power of the blower and the frequency converter, etc., to adjust the air pressure in the airbag 41.

[0039] The printing device 100 may also include a charge coupled device (CCD, not shown), which is used to be electrically connected to the processor 50. The CCD can convert optical images into digital signals and feed back the position information of the substrate 12 to be printed to the processor 50. The processor 50 controls the initial printing position of the printing device 100 according to the position information to ensure printing accuracy.

[0040] The printing device 100 provided in the embodiment of the present application includes a guide rail 20, a driving assembly 30 and a roller assembly 40. The driving assembly 30 drives the roller assembly 40 to move along the direction in which the guide rail 20 is set, and at the same time, the mesh 42 and the sleeve 43 in the roller assembly 40 can rotate relative to the airbag 41 to achieve ink printing. The thickness of the printed ink can be controlled by the pressure of the airbag 41 and the moving speed of the driving assembly 30. Compared with the related art, the variables affecting the ink printing are effectively reduced, thereby effectively improving the quality of the formed solder mask 16 and reducing the difficulty of operation; and the ink is contained in the ink tank formed between the mesh 42 and the airbag 41, which can slow down the change of the ink viscosity and improve the ink printing quality.

[0041] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A printing device for printing ink, characterized in that: The printing device comprises: A guide rail arranged along a first direction; a driving assembly, one end of which is connected to the guide rail and is movable along the first direction; and The roller assembly comprises: An airbag, wherein the axial direction of the airbag is a second direction, and the second direction is perpendicular to the first direction; A mesh is sleeved on the airbag, the mesh is spaced apart from the airbag to form an ink tank and is rotatably connected to the airbag, the ink tank is used to contain the ink; and A sleeve is sleeved on the surface of the mesh, the sleeve is provided with an opening, and the other end of the driving component is relatively fixed to the airbag; When the driving assembly drives the roller assembly to move along the first direction, the sleeve and the mesh rotate with the second direction as the rotation axis, and the volume of the airbag can change, so as to squeeze the ink and allow the ink to pass through the mesh and the opening to print the ink.

2. The printing device according to claim 1, characterized in that The roller assembly also includes two protective covers, which are arranged at the ends of the airbag and the mesh, and the protective covers are fixedly connected to the airbag, and are used to seal the ink tank.

3. The printing device according to claim 2, characterized in that The roller assembly also includes a scraper, which includes a scraping and pressing portion and two connecting portions, wherein the two connecting portions are arranged at both ends of the scraping and pressing portion and are fixedly connected to the protective cover, and the scraping and pressing portion extends along the second direction and is arranged between the airbag and the mesh and is abutted against the inner surface of the mesh.

4. The printing device according to claim 3, characterized in that The scraping and pressing portion includes a scraping and pressing surface arranged along the second direction, and an angle between the scraping and pressing surface and the first direction is an acute angle.

5. The printing device according to any one of claims 2 to 4, characterized in that: The printing device further includes a bearing connecting the protective cover and the sleeve, wherein the bearing enables the sleeve to rotate relative to the airbag.

6. The printing device according to claim 5, characterized in that The bearing comprises a fixed part and a rotating part, the rotating part can rotate relative to the fixed part, the fixed part is fixedly connected to the protective cover, and the rotating part is relatively fixed to the sleeve.

7. The printing device according to any one of claims 1 to 4, characterized in that: The printing device further comprises a blower, wherein the blower is connected to the airbag and is used for providing air pressure to the airbag.

8. The printing device according to any one of claims 1 to 4, characterized in that: A guide groove is provided on the guide rail, and the guide groove extends along the first direction; the driving assembly includes a motor and a guide rod, the guide rod is fixedly connected to the motor, and one end of the guide rod is rotatably connected to the sleeve away from the motor, and the motor has a protrusion, which can be received in the guide groove and can move in the guide groove along the first direction.

9. The printing device according to any one of claims 1 to 4, characterized in that: The printing device further comprises a charge coupled device, and the charge coupled device is used to feed back position information of a substrate to be printed to a processor.

10. The printing device according to any one of claims 1 to 4, characterized in that: The sleeve is made of polytetrafluoroethylene.

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