CN213798666U - Printing device and screen plate - Google Patents

Abstract

The utility model discloses a printing device and otter board. The printing device comprises a printing machine and a screen, wherein the printing machine comprises a workbench, a screen clamping mechanism, a printing unit and a boss fixed on the workbench; the screen plate comprises a first screen frame, a second screen frame and a grid piece, the first screen frame and the second screen frame are arranged in a stacked mode and are detachably connected, and the grid piece is arranged between the first screen frame and the second screen frame; the first screen frame and the second screen frame can be detachably fixed on the screen plate clamping mechanism, a first distance is reserved between one side of the first screen frame, which is back to the grid piece, and one side of the second screen frame, which is corresponding to the grid piece, a second distance is reserved between the upper end surface of the boss and the upper surface of the workbench, a third distance is reserved between the upper end surface of the boss and the upper surface of the workbench, the third distance is greater than or equal to the first distance, and the third distance is greater than or equal to the second distance; the length of the upper end surface of the boss along any direction is smaller than the length of the grid piece along the corresponding direction. The cost of the consumed material of the screen plate can be saved by the scheme.

Description

Printing device and screen plate

Technical Field

The utility model relates to a circuit board printing technology field, specific be a printing device and otter board.

Background

When the circuit board is subjected to solder mask printing, a printer and a screen plate are generally adopted to assist the operation. It is common practice to fix the circuit board on the table of the printing machine, clamp the screen plate on the printing machine, drive the screen plate to move downward to contact the circuit board, and print ink on the screen plate by the printing unit of the printing machine, wherein the ink is printed on the circuit board through the screen plate.

As shown in fig. 1 to 3, most conventional screen plates include a square frame 11 and a mesh member 12 fixed to the frame 11, one end of the frame 11 in the thickness direction is connected to a screen plate clamping mechanism of a printing machine, and the mesh member 12 is fixed to the other end of the frame 11 in the thickness direction so as to contact a circuit board. Thus, the mesh 12 also has opposite a-sides (the a-sides are close to the screen chuck when the screen is clamped in the printer) and B-sides (the B-sides are away from the screen chuck when the screen is clamped in the printer).

For a double-sided printed circuit board, the patterns on both sides of the circuit board are typically arranged in mirror image. When printing, the front side of the circuit board can be printed firstly, then the circuit board is baked, and after the ink on the front side of the circuit board is dried, the circuit board is reversely arranged, so that the reverse side of the circuit board can be printed by the printer.

Limited by the structure of the prior mesh plate, the mesh member 12 of the mesh plate can only be used on one side, that is, only the side B can be used, but the side A cannot be used. This is because, when the screen is turned over, there is no portion on the side B of the mesh member 12 which can be gripped by the screen clamping mechanism, or the side B is difficult to be fixed to the printing machine, and the presence of the screen frame 11 makes the side a of the mesh member 12 not contact the circuit board when the screen is turned over, and thus the printing operation is impossible. Therefore, at present, a circuit board needs to be printed by using two screens, namely a forward screen (as shown in fig. 2) and a reverse screen (as shown in fig. 3), and the patterns on the forward screen and the reverse screen are arranged in a mirror image mode. For a production line with a large production capacity, a sufficient amount of net panels is needed to meet the production demand.

In summary, the problem to be solved by those skilled in the art is how to reduce the amount of screen used in the printing process to reduce the material cost of the screen and the storage space of the prepared material.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the embodiment of the utility model provides a printing device and otter board, it is used for solving at least one in the above-mentioned problem.

The embodiment of the application discloses: a printing device comprises a printing machine and a screen, wherein the printing machine comprises a workbench, a screen clamping mechanism arranged above the workbench, a printing unit arranged above the workbench and a boss fixed on the workbench; the net plate comprises a first net frame, a second net frame and a net piece, the first net frame and the second net frame are arranged in a stacked mode and are detachably connected, and the net piece is arranged between the first net frame and the second net frame; the first screen frame and the second screen frame are detachably fixed on the screen plate clamping mechanism, a first distance is reserved between one side, away from the grid piece, of the first screen frame and one side, corresponding to the grid piece, of the second screen frame, a second distance is reserved between one side, away from the grid piece, of the second screen frame and one side, corresponding to the grid piece, of the second screen frame, a third distance is reserved between the upper end face of the boss and the upper surface of the workbench, the third distance is larger than or equal to the first distance, and the third distance is larger than or equal to the second distance; the length of the upper end face of the boss in any direction is smaller than the length of the grid piece in the corresponding direction.

Specifically, when the first screen frame is located above the second screen frame, the grid member is used for processing a first end face of a product; when the first screen frame is positioned below the second screen frame, the grid piece is used for processing a second end face of the product; the first end face and the second end face of the product are arranged oppositely.

Specifically, the boss and the workbench are connected through a pin, and the upper end face of the pin is not higher than that of the boss.

Specifically, a plurality of air holes are formed in the boss.

Specifically, the boss is provided with a plurality of positioning holes for positioning the circuit board.

The embodiment of the application also discloses: a printing method of a circuit board, which uses a printing apparatus according to an embodiment of the present application to print a circuit board, wherein a side of the grid element facing away from the first screen frame is defined as a first surface, and a side of the grid element facing away from the second screen frame is defined as a second surface, the circuit board has a front surface and a back surface that are arranged opposite to each other, the first surface of the grid element is used for forming a pattern of the front surface of the circuit board, and the second surface of the grid element is used for forming a pattern of the back surface of the circuit board; the method comprises the following steps:

placing the circuit board on the boss, wherein the back surface of the circuit board is abutted against the boss, so that the front surface of the circuit board faces the printing unit;

fixing a first screen frame of the screen plate on the screen plate clamping mechanism so that a first surface of the grid piece can be abutted against the front surface of the circuit board;

printing the front surface of the circuit board by adopting the printing unit;

drying the front side of the circuit board;

placing the circuit board with the front surface dried on the boss, wherein the front surface of the circuit board is abutted against the boss, so that the back surface of the circuit board faces the printing unit;

the screen plate is detached from the screen plate clamping mechanism and cleaned, and a second screen frame of the cleaned screen plate is fixed on the screen plate clamping mechanism, so that a second surface of the grid piece can be abutted against the reverse side of the circuit board;

printing the reverse side of the circuit board by adopting the printing unit;

and drying the reverse side of the circuit board.

The embodiment of the application also discloses: a mesh plate comprises a first mesh frame, a second mesh frame and a mesh piece, wherein the first mesh frame and the second mesh frame are arranged in a stacked mode and detachably connected, and the mesh piece is arranged between the first mesh frame and the second mesh frame.

In particular, the mesh element is bonded to the first frame on the side facing the second frame, and/or the mesh element is bonded to the second frame on the side facing the first frame.

Specifically, the first screen frame and the second screen frame are connected by screws.

Specifically, the first net frame or the second net frame is provided with a countersunk hole for completely accommodating the head of the screw.

The utility model discloses following beneficial effect has at least:

the printing device of the embodiment can print two sides of a circuit board by two sides of the same screen plate respectively under the matching of the lug boss and the screen plate with a unique structure. Compared with the prior art, the structure and the graphic processing mode of the mesh piece on the mesh plate of the embodiment are unchanged, and the scheme can be realized only by changing the structure of the mesh frame, so that the mode of combining the original forward mesh plate and the reverse mesh plate into one mesh plate through optimization can greatly reduce the using amount of the mesh piece and the mesh frame, reduce the material cost, and meanwhile, the production line is not required to be provided with too much space for containing the mesh plate, thereby saving the occupied space of the production line.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a bottom view of a prior art positive screen mounted on a printing press;

FIG. 2 is a bottom view of a prior art inverted screen mounted on a printing press;

FIG. 3 is a cross-sectional view of a prior art mesh panel;

FIG. 4 is a schematic view of a structure of a mesh plate in an embodiment of the present invention;

FIG. 5 is a cross-sectional view taken at A-A of FIG. 4;

FIG. 6 is a partial enlarged view at B in FIG. 5;

FIG. 7 is a schematic diagram of an embodiment of the present invention;

fig. 8 is a partial enlarged view at C in fig. 7.

Reference numerals of the above figures: 11. a screen frame; 111. a first frame; 112. a second frame; 1110. a countersunk hole; 12. a mesh member; 121. a first side; 122. a second face; 13. a screw; 21. a work table; 22. a boss; 3. a printing unit; 4. a circuit board.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 4 to 8, the printing apparatus of the present embodiment may be used for printing the circuit board 4, and the printing apparatus specifically includes a printer and a screen. The printer includes a table 21, a screen clamping mechanism (not shown) provided above the table 21, a printing unit 3 provided above the table 21, and a boss 22 fixed to the table 21.

Referring with emphasis to fig. 4 to 6, the mesh panel may include a first frame 111, a second frame 112 and the mesh 12. The first frame 111 and the second frame 112 are stacked and detachably connected, the mesh member 12 is disposed between the first frame 111 and the second frame 112, and the mesh member 12 is tightened on the first frame 111 or the second frame 112 and has a certain tension. The screen plate clamping mechanism is used for installing screen plates, and the first screen frame 111 and the second screen frame 112 of the screen plates can be fixedly connected with the screen plate clamping mechanism in turn, so that the first screen frame 111 and the second screen frame 112 are detachably connected with the screen plate clamping mechanism.

Referring back to fig. 8, the first frame 111 has a first distance L1 between a side facing away from the mesh 12 and a side corresponding to the mesh 12, and the second frame 112 has a second distance L2 between a side facing away from the mesh 12 and a side corresponding to the mesh 12. In other words, one side of the mesh 12 faces the first frame 111 with a first distance L1 from the side of the first frame 111 facing away from the mesh 12, and the other side of the mesh 12 faces the second frame 112 with a second distance L2 from the side of the second frame 112 facing away from the mesh 12. A third distance L3 is provided between the upper end surface of the boss 22 and the upper surface of the table 21, the third distance L3 is greater than or equal to the first distance L1, and the third distance L3 is greater than or equal to the second distance L2, so as to ensure that the second frame 112 does not contact the table 21 of the printing machine when the first frame 111 is connected to the screen clamping mechanism, thereby causing mechanical interference, and similarly, when the second frame 112 is connected to the screen clamping mechanism, the first frame 111 may not contact the table 21, thereby avoiding mechanical interference.

The length of the upper end surface of the boss 22 in any direction is smaller than the length of the grid element 12 in the corresponding direction, so as to ensure that the first screen frame 111 or the second screen frame 112 can avoid the circuit board 4, and further ensure that two side surfaces of the grid element 12 can be in complete contact with the circuit board 4 on the boss 22, so as to realize printing operation. Preferably, the upper end surface of the boss 22 extends in a horizontal direction and is substantially square, and the first frame 111 and the second frame 112 may also be substantially square, so that the inner length of the first frame 111 and the second frame 112 is greater than or equal to the length of the boss 22, and the inner width of the first frame 111 and the second frame 112 is greater than or equal to the width of the boss 22.

The operation of the printing apparatus of the present embodiment will be described with particular reference to fig. 7 and 8. For convenience of description, a side of the mesh element 12 facing away from the first frame 111 may be defined as a first surface 121, a side of the mesh element 12 facing away from the second frame 112 may be defined as a second surface 122, the circuit board 4 has a front surface (i.e., a first end surface of the product) and a back surface (i.e., a second end surface of the product) which are oppositely disposed, the first surface 121 of the mesh element 12 is used for forming a pattern of the front surface of the circuit board 4, and the second surface 122 of the mesh element 12 is used for forming a pattern of the back surface of the circuit board 4. It should be noted that the figures in the drawings are only examples, and the grid member 12 of the present embodiment may perform corresponding graphic processing according to any desired patterns on the circuit board 4. The specific working principle of the printing device is as follows:

placing the circuit board 4 on the boss 22 so that the reverse side of the circuit board 4 is abutted against the boss 22 so that the front side of the circuit board 4 faces the printing unit 3;

fixing a first screen frame 111 of the screen plate on a screen plate clamping mechanism so that a first surface 121 of the screen member 12 can be abutted against the front surface of the circuit board 4, and further processing the front surface of the circuit board 4;

printing the front side of the circuit board 4 by using a printing unit 3;

drying the front side of the circuit board 4 to dry the ink;

the circuit board 4 with the front surface dried is placed on the boss 22, the front surface of the circuit board 4 is downward to be abutted against the boss 22,

so that the reverse side of the wiring board 4 faces upward toward the printing unit 3;

detaching the screen plate from the screen plate clamping mechanism, cleaning ink on the grid part 12 of the screen plate, and fixing the second screen frame 112 of the cleaned screen plate on the screen plate clamping mechanism, so that the second surface 122 of the grid part 12 can be abutted against the reverse surface of the circuit board 4, and further processing the reverse surface of the circuit board 4;

printing the reverse side of the circuit board 4 by using a printing unit 3;

and drying the reverse side of the circuit board 4.

By means of the above scheme, the printing device of the embodiment can print both sides of one circuit board 4 by using both sides of the same screen plate under the matching of the boss 22 and the screen plate with a unique structure. Compared with the prior art, the structure and the graphic processing mode of the mesh part 12 on the mesh plate of the embodiment are not changed, and the scheme can be realized only by changing the structure of the mesh frame, therefore, the mode of combining the original forward mesh plate and the reverse mesh plate into one mesh plate through optimization can greatly reduce the using amount of the mesh part 12 and the mesh frame, reduce the material cost, and meanwhile, the production line is not required to be provided with too much space for containing the mesh plate, thereby saving the occupied space of the production line.

Specifically, the boss 22 and the table 21 of the present embodiment may be integrally formed, or may be connected by a pin (not shown). When the boss 22 is connected to the table 21 by a pin, the upper end surface of the pin is not higher than the upper end surface of the boss 22, that is, the pin is sunk into the boss 22, so as to prevent the circuit board 4 placed on the boss 22 from being affected.

Preferably, the boss 22 may be made of epoxy. The boss 22 may be provided with a plurality of ventilation holes (not shown) penetrating the boss 22 in the thickness direction, and the ventilation holes may substantially correspond to the holes of the wiring board 4 so as to discharge the gas in the ink at the time of printing. The boss 22 may be provided with a plurality of positioning holes (not shown) for positioning the wiring board 4.

Specifically, the mesh 12 may be adhesively bonded to the first frame 111 on the side facing the second frame 112, and/or the mesh 12 may be bonded to the second frame 112 on the side facing the first frame 111. The gluing may increase the strength of the connection of the mesh 12 to the first frame 111 and/or the second frame 112, ensuring that the mesh 12 has sufficient tension.

Specifically, as shown in fig. 6, the first frame 111 and the second frame 112 may be connected by screws 13. The first screen frame 111 or the second screen frame 112 may be provided with a countersunk hole 1110 for completely receiving a head of the screw 13, and when the screw 13 is connected to the first screen frame 111 and the second screen frame 112, both ends of the screw 13 do not protrude out of the first screen frame 111 and the second screen frame 112, in other words, the screw 13 is completely embedded in the first screen frame 111 and the second screen frame 112 so as not to mechanically interfere with the workbench 21.

The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims (9)

1. A printing device is characterized by comprising a printing machine and a screen, wherein the printing machine comprises a workbench, a screen clamping mechanism arranged above the workbench, a printing unit arranged above the workbench and a boss fixed on the workbench; the net plate comprises a first net frame, a second net frame and a net piece, the first net frame and the second net frame are arranged in a stacked mode and are detachably connected, and the net piece is arranged between the first net frame and the second net frame; the first screen frame and the second screen frame are detachably fixed on the screen plate clamping mechanism, a first distance is reserved between one side, away from the grid piece, of the first screen frame and one side, corresponding to the grid piece, of the second screen frame, a second distance is reserved between one side, away from the grid piece, of the second screen frame and one side, corresponding to the grid piece, of the second screen frame, a third distance is reserved between the upper end face of the boss and the upper surface of the workbench, the third distance is larger than or equal to the first distance, and the third distance is larger than or equal to the second distance; the length of the upper end face of the boss in any direction is smaller than the length of the grid piece in the corresponding direction.

2. A printing unit according to claim 1, wherein the mesh is for machining a first end face of a product when the first frame is positioned over the second frame; when the first screen frame is positioned below the second screen frame, the grid piece is used for processing a second end face of the product; the first end face and the second end face of the product are arranged oppositely.

3. The printing device of claim 1, wherein the boss is connected with the workbench by a pin, and an upper end surface of the pin is not higher than that of the boss.

4. The printing device of claim 1, wherein the boss has a plurality of air holes formed therein.

5. The printing apparatus of claim 1, wherein the boss defines a plurality of positioning holes for positioning the circuit board.

6. A mesh plate is characterized by comprising a first mesh frame, a second mesh frame and a mesh piece, wherein the first mesh frame and the second mesh frame are arranged in a stacked mode and detachably connected, and the mesh piece is arranged between the first mesh frame and the second mesh frame.

7. A mesh panel according to claim 6, wherein said mesh element is bonded to the side of said first frame facing said second frame and/or said mesh element is bonded to the side of said second frame facing said first frame.

8. A mesh panel according to claim 6, wherein the first frame and the second frame are attached using screws.

9. A mesh panel according to claim 8, wherein the first or second frame is provided with a countersunk hole for receiving the head of the screw completely.

Images