Screen plate and printing device

Abstract

The utility model relates to the field of circuit board printing equipment, in particular to a screen and a printing device.The screen comprises a screen body and an elastic component, the elastic component comprises a fixed end and a movable end, and the fixed end and the movable end can be close to each other or away from each other; the elastic component is connected to the side, where the printing holes are located, of the screen body through the fixing end. When the elastic component is in a compressed state, the movable end of the elastic component can be flush with or lower than the face of the side, where the printing holes are located, of the screen body. When the elastic component is in a relaxed state, the movable end of the elastic component can protrude out of the face of the side, where the printing hole is located, of the screen body, through the arrangement, the probability that the screen drives a welded object to move through a weldable object is reduced, then the probability that the shape of the weldable object on the welded object changes is reduced, and the welding quality of the welded object is improved. And the printing quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of circuit board printing equipment, and particularly relates to a stencil and a printing device. Background Art

[0002] When printing a circuit board, solder paste and other solderable substances are commonly used to print a lead frame or the like. During this printing process, a stencil is required. The stencil is closely attached to the object to be soldered, and the solder paste and other solderable substances are evenly printed onto the designated position on the object to be soldered through a squeegee.

[0003] When using a stencil for printing, the side of the stencil provided with printing holes moves downward until it abuts against the object to be soldered. After printing is completed, the stencil needs to move upward to disengage from the object to be soldered. However, when the stencil moves upward, its speed is relatively slow. Since the solderable substance has a certain viscosity, the stencil drives the object to be soldered to displace when moving upward, causing the shape of the solderable substance on the object to be soldered to change, thereby resulting in a deterioration of the printing quality. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defect in the prior art that when the stencil is disengaged from the object to be soldered after printing, due to the certain viscosity of the solderable substance, the stencil drives the object to be soldered to displace when moving upward, causing the shape of the solderable substance on the object to be soldered to change, thereby resulting in a deterioration of the printing quality, and to provide a stencil and a printing device.

[0005] In a first aspect, the utility model provides a stencil, which includes a stencil body and an elastic member. The elastic member includes a fixed end and a movable end, and the fixed end and the movable end can approach or move away from each other. The elastic member is connected to the side of the stencil body where the printing holes are located through the fixed end.

[0006] When the elastic member is in a compressed state, the movable end of the elastic member can be flush with or lower than the surface of the side of the stencil body where the printing holes are located.

[0007] When the elastic member is in a relaxed state, the movable end of the elastic member can protrude from the surface of the side of the stencil body where the printing holes are located.

[0008] The compressed state means that the elastic member is subjected to a force towards the fixed end of the elastic member, causing the movable end of the elastic member to move towards the fixed end, thereby causing the elastic member to contract until the movable end of the elastic member is flush with the surface of the side of the stencil body where the printing holes are located, or the movable end of the elastic member is lower than the surface of the side of the stencil body where the printing holes are located, so that the elastic member does not affect the printing operation of the stencil.

[0009] The relaxation state means that the elastic component is not subjected to a force in the axial direction of the fixed end and the movable end, or the force applied to the elastic component in the axial direction of the fixed end and the movable end is less than the elastic force of the elastic component, so that the movable end can protrude from the surface on the side where the printing holes of the stencil body are located.

[0010] The surface on the side where the printing holes of the stencil body are located refers to the surface of the stencil body that contacts the object to be welded.

[0011] With this setting, when printing operations are carried out, the side where the printing holes of the stencil body are located abuts against the object to be welded, thereby compressing the elastic component. At this time, the movable end of the elastic component is flush with the surface on the side where the printing holes of the stencil body are located. When there is a protruding part at the position corresponding to the elastic component on the object to be welded, the movable end of the elastic component can be compressed by the protruding part to be lower than the surface on the side where the printing holes of the stencil body are located, so that the elastic component does not affect the printing operation of the stencil; when the printing operation is completed, the printing equipment stops applying a force to the object to be welded through the stencil body, and the elastic component has a tendency to rebound to the relaxation state. The elastic component can apply elastic forces in opposite directions to the object to be welded and the stencil body, accelerating the separation speed of the stencil body and the object to be welded, shortening the separation time of the stencil body and the object to be welded, and thus reducing the time for the stencil body to apply a force to the object to be welded through the adhesive force of the solderable material. Thereby reducing the degree of change in the momentum of the object to be welded, and since the object to be welded tends to be in a static state due to inertia, the possibility of displacement of the object to be welded is reduced, the probability of the shape change of the solderable material on the object to be welded is reduced, and the printing quality is improved. When the elastic component returns to the relaxation state through its own elastic force, since the movable end of the elastic component protrudes from the surface on the side where the printing holes of the stencil body are located, the movable end of the elastic component supports the object to be welded, and the object to be welded is separated from the stencil body.

[0012] The elastic component can be a spring, a spring ejector pin, a spring column, a rubber pad, etc.

[0013] On the surface on the side where the printing holes of the stencil body are located, an installation groove, an installation hole, etc. can be provided, so that the depth of the installation groove or the installation hole is less than the height of the elastic component in the relaxation state. The fixed end of the elastic component is connected to the bottom surface of the installation groove or the bottom surface of the installation hole. When the elastic component is in the relaxation state, the movable end of the elastic component can extend out of the installation groove or the installation hole and protrude from the surface on the side where the printing holes of the stencil body are located; when the elastic component is in the compressed state, the movable end of the elastic component can be pressed into the installation groove or the installation hole, so that the movable end of the elastic component can be flush with or lower than the surface on the side where the printing holes of the stencil body are located.

[0014] The elastic components are several. An installation groove is formed on the surface of the screen plate body on the side where the printing holes are located. Several of the elastic components are all connected to the screen plate body through the bottom surface of the installation groove.

[0015] By providing the installation groove, when the elastic component is in a diastolic state, the movable end of the elastic component can extend out of the installation groove and protrude from the surface of the screen plate body on the side where the printing holes are located; when the elastic component is in a compressed state, the movable end of the elastic component can be pressed into the installation groove, so that the movable end of the elastic component can be flush with or lower than the surface of the screen plate body on the side where the printing holes are located.

[0016] Connecting the elastic component to the screen plate body through the bottom surface of the installation groove facilitates the cleaning of debris, dust, etc. that enter the installation groove. Of course, the elastic component can also be connected to the screen plate body through the bottom surface of the installation hole.

[0017] The number of the elastic components can be 2, 3, 4, etc.

[0018] The installation groove is arranged at the edge of the surface of the screen plate body on the side where the printing holes are located.

[0019] By arranging the installation groove at the edge of the surface of the screen plate body on the side where the printing holes are located, the influence of the elastic component on the printing operation is reduced.

[0020] The surface of the screen plate body on the side where the printing holes are located is rectangular. The number of the installation grooves is 2. The two installation grooves are respectively arranged oppositely on the two long sides of the rectangle. The installation grooves can also be respectively arranged oppositely on the two short sides of the rectangle.

[0021] Several of the elastic components are symmetrically arranged along the axis of symmetry of the rectangle in the two installation grooves.

[0022] By symmetrically arranging several elastic components, the force on several elastic components can be more balanced when bearing loads, improving the stability of the screen plate.

[0023] The axis of symmetry of the rectangle can be the axis of symmetry perpendicular to the long side of the rectangle, or the axis of symmetry perpendicular to the short side of the rectangle.

[0024] Several of the elastic components located in the same installation groove are arranged at equal intervals.

[0025] By arranging several of the elastic components located in the same installation groove at equal intervals, the loads borne by each elastic component are more uniform, reducing the occurrence probability of local overload, thereby improving the durability of the screen plate.

[0026] The intervals of several of the elastic components located in the same installation groove can also be set randomly.

[0027] The stencil further includes a mounting plate, and the printing holes are disposed on the mounting plate.

[0028] By disposing the printing holes on the mounting plate, the connection manner between the mounting plate and the stencil body can be set as a detachable connection. Mounting plates with different types and numbers of printing holes can be selected according to actual requirements, improving the flexibility of stencil use.

[0029] In a second aspect, the present utility model further provides a printing device adopting the stencil described above.

[0030] By disposing the stencil in the printing device, after printing is completed, the stencil can be quickly separated from the object to be welded, reducing the possibility that the object to be welded is displaced due to the adhesion of the solderable material, decreasing the probability of the shape change of the solderable material on the object to be welded, and improving the printing quality.

[0031] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0032] 1. The present utility model provides a stencil, including a stencil body and an elastic member. The elastic member includes a fixed end and a movable end, and the fixed end and the movable end can approach or move away from each other. The elastic member is connected to the side of the stencil body where the printing holes are located through the fixed end. When the elastic member is in a compressed state, the movable end of the elastic member can be flush with or lower than the side of the stencil body where the printing holes are located. When the elastic member is in a relaxed state, the movable end of the elastic member can protrude from the side of the stencil body where the printing holes are located. Through this setting, the probability that the stencil body drives the object to be welded to displace through the solderable material is reduced, and further the probability that the shape of the solderable material on the object to be welded changes is reduced, improving the printing quality.

[0033] 2. The present utility model provides a printing device adopting the stencil described above. By disposing the stencil in the printing device, after printing is completed, the stencil can be quickly separated from the object to be welded, reducing the possibility that the object to be welded is displaced due to the adhesion of the solderable material, decreasing the probability of the shape change of the solderable material on the object to be welded, and improving the printing quality. Description of the Drawings

[0034] Figure 1 Schematic perspective view of the stencil provided in Embodiment 1 of the present utility model.

[0035] Markings in the figure:

[0036] 1 - elastic member, 2 - printing hole, 3 - mounting plate, 4 - stencil body, 5 - mounting groove. Detailed Embodiments

[0037] The present utility model will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. Any technology implemented based on the content of the present utility model belongs to the scope of the present utility model.

[0038] In the description of the specific embodiments of the present utility model, without special explanation, the terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all expressions based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the utility model product / device / installation is usually used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0039] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still play its role in the solution of the present utility model.

[0040] In addition, the expressions such as "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be construed as emphasizing or implying the relative importance of a specific component.

[0041] In addition, in the description of the embodiments of the present utility model, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., or even more than 9.

[0042] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / restricted, where the terms "set", "installed", "connected", "linked", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection, and can be connection means commonly used in the art such as welding, riveting, bolting, and threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0043] Embodiment 1

[0044] As Figure 1 shown, this embodiment provides a stencil, including a stencil body 4 and an elastic member 1. The elastic member 1 includes a fixed end and a movable end, and the fixed end and the movable end can approach or move away from each other. The elastic member 1 is connected to one side of the printing hole 4 of the stencil body 4 through the fixed end;

[0045] When the elastic member 1 is in a compressed state, the movable end of the elastic member 1 can be flush with or lower than the surface of the side of the stencil body 4 where the printing hole 2 is located;

[0046] When the elastic member 1 is in a relaxed state, the movable end of the elastic member 1 can protrude from the surface of the side of the stencil body 4 where the printing hole 2 is located.

[0047] The compressed state means that the elastic member 1 is subjected to a force towards the fixed end of the elastic member 1, causing the movable end of the elastic member 1 to move towards the fixed end, thereby causing the elastic member 1 to contract until the movable end of the elastic member 1 is flush with the surface of the side of the stencil body 4 where the printing hole 2 is located, or the movable end of the elastic member 1 is lower than the surface of the side of the stencil body 4 where the printing hole 2 is located, so that the elastic member 1 does not affect the printing operation of the stencil.

[0048] The relaxed state means that the elastic member 1 is not subjected to a force along the axis direction of the fixed end and the movable end, or the force applied to the elastic member 1 along the axis direction of the fixed end and the movable end is less than the elastic force of the elastic member 1, so that the movable end can protrude from the surface of the side of the stencil body 4 where the printing hole 2 is located.

[0049] The surface of the side of the stencil body 4 where the printing hole 2 is located refers to the surface of the stencil body 4 that contacts the object to be welded.

[0050] With this setting, when a printing operation is performed, the side of the stencil body 4 where the printing holes 2 are located abuts against the object to be welded, thereby compressing the elastic member 1. At this time, the movable end of the elastic member 1 is flush with the surface of the stencil body 4 on the side where the printing holes 2 are located. When there are protrusions at the positions corresponding to the elastic member 1 on the object to be welded, the movable end of the elastic member 1 can be compressed by the protrusions to be lower than the surface of the stencil body 4 on the side where the printing holes 2 are located, so that the elastic member 1 does not affect the stencil for printing operations; when the printing operation is completed, the printing equipment stops applying force to the object to be welded through the stencil body 4, and the elastic member 1 has a tendency to rebound to the relaxed state. The elastic member 1 can apply elastic forces in opposite directions to the object to be welded and the stencil body 4, accelerating the separation speed of the stencil body 4 from the object to be welded, shortening the separation time of the stencil body 4 from the object to be welded, and thus reducing the time for the stencil body 4 to apply force to the object to be welded through the bonding force of the solderable material. Thereby reducing the degree of change in the momentum of the object to be welded, and since the object to be welded tends to be in a stationary state due to inertia, the possibility of displacement of the object to be welded is reduced, the probability of the shape change of the solderable material on the object to be welded is reduced, and the printing quality is improved. When the elastic member 1 returns to the relaxed state by its own elastic force, since the movable end of the elastic member 1 protrudes from the surface of the stencil body 4 on the side where the printing holes 2 are located, the movable end of the elastic member 1 supports the object to be welded, and the object to be welded is separated from the stencil body 4.

[0051] The elastic member 1 is a spring ejector pin.

[0052] There are 4 elastic members 1, and installation grooves 5 are provided on the surface of the stencil body 4 on the side where the printing holes 2 are located. A plurality of the elastic members 1 are all connected to the stencil body 4 through the bottom surface of the installation grooves 5.

[0053] By providing the installation grooves 5, when the elastic member 1 is in the relaxed state, the movable end of the elastic member 1 can extend out of the installation grooves 5 and protrude from the surface of the stencil body 4 on the side where the printing holes 2 are located; when the elastic member 1 is in the compressed state, the movable end of the elastic member 1 can be pressed into the installation grooves 5, so that the movable end of the elastic member 1 can be flush with or lower than the surface of the stencil body 4 on the side where the printing holes 2 are located.

[0054] The surface of the stencil body 4 on the side where the printing holes 2 are located is rectangular, and the number of the installation grooves 5 is 2. The two installation grooves 5 are respectively arranged oppositely on the two long sides of the rectangle.

[0055] A plurality of the elastic members 1 are symmetrically arranged along the axis of symmetry of the rectangle.

[0056] By symmetrically arranging a number of elastic components 1, the force on the elastic components 1 can be more balanced when bearing loads, improving the stability of the mesh plate.

[0057] The axis of symmetry of the rectangle is the axis of symmetry perpendicular to the short side of the rectangle.

[0058] The mesh plate further includes a mounting plate 3, and the printing holes 2 are arranged on the mounting plate 3.

[0059] By arranging the printing holes 2 on the mounting plate 3 and setting the connection mode between the mounting plate 3 and the mesh plate body 4 as a detachable connection, a mounting plate 3 with different types and numbers of printing holes 2 can be selected according to actual needs, improving the flexibility of the mesh plate in use.

[0060] Embodiment 2

[0061] This embodiment provides a printing device that uses the described mesh plate.

[0062] The printing device is a screen printing machine. By setting the mesh plate in the printing device, after printing is completed, the mesh plate can be quickly separated from the object to be welded, reducing the possibility of the object to be welded being displaced due to the adhesion of the solderable material, and reducing the probability of the shape of the solderable material on the object to be welded changing, improving the printing quality.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A screen, characterized in that: It comprises a screen body (4) and an elastic component (1), wherein the elastic component (1) comprises a fixed end and a movable end, wherein the fixed end and the movable end can be moved closer to or farther from each other, and the elastic component (1) is connected to a side of the screen body (4) where the printing hole (2) is located via the fixed end; When the elastic component (1) is in a compressed state, the movable end of the elastic component (1) can be flush with or lower than the surface of the side where the printing hole (2) of the screen body (4) is located; When the elastic component (1) is in a relaxed state, the movable end of the elastic component (1) can protrude from the surface of the screen body (4) on the side where the printing hole (2) is located.

2. A screen according to claim 1, characterized in that: There are a plurality of elastic components (1), and a mounting groove (5) is provided on the surface of the screen body (4) on the side where the printing hole (2) is located. The plurality of elastic components (1) are connected to the screen body (4) through the bottom surface of the mounting groove (5).

3. A screen plate according to claim 2, characterized in that: The mounting groove (5) is arranged at the edge of the surface of the screen body (4) on the side where the printing hole (2) is located.

4. A screen plate according to claim 3, characterized in that: The surface of the screen body (4) on one side where the printing hole (2) is located is rectangular, the number of the mounting grooves (5) is two, and the two mounting grooves (5) are respectively arranged opposite to the two long sides of the rectangle.

5. A screen plate according to claim 4, characterized in that: The plurality of elastic components (1) are symmetrically arranged along the symmetry axis of the rectangle.

6. A screen according to any one of claims 2 to 5, characterized in that: The plurality of elastic components (1) located in the same installation groove (5) are arranged at equal intervals.

7. A screen plate according to claim 6, characterized in that: The elastic component (1) is a spring or a spring ejector pin or a spring column.

8. A screen plate according to claim 6, characterized in that: The elastic component (1) is a rubber pad.

9. A screen plate according to claim 6, characterized in that: It also comprises a mounting plate (3), and the printing hole (2) is arranged on the mounting plate (3).

10. A printing device, using a screen as claimed in any one of claims 1 to 9.

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