JP5496433B1 - Screen printing version - Google Patents

Abstract

The screen printing plate (1) projects along the metal mask (2) having the sandwiched area (6) at the periphery, the frame (3) disposed at the periphery of the metal mask (2), and the frame (3). A pedestal (11) provided on the pedestal (11), a reference surface (13) formed as a surface including the metal mask (2) when the metal mask (2) is placed on the pedestal (11), and a pressing surface (14 ) And the holding area (15) in cooperation with each other, a cover (9) for clamping the clamped area (6), and an engagement member (7) for fixing the clamped area (6) to the frame (3) And a moving unit (17) for moving the engaging member (7) in the holding region (15), and the sandwiched region (6) is a reference plane in a state of sandwiching the sandwiched region (6). (13) is substantially parallel and the pressing surface (14) is lower than the reference surface (13). Located engaging member (7) moves inside and toward the outside and in the direction parallel reference surface (13) of the frame (3).

Description

  The present invention relates to a screen printing plate used for surface paste mounting solder paste printing by a screen printing method.

  A conventional screen printing plate is formed by attaching a sheet made of polyester fiber or the like called “紗” to one surface of a substantially rectangular frame and bonding a metal mask to the sheet. Since these frames, sheets, and metal masks are integrated by bonding or the like, a certain amount of storage space is required, and the handleability is poor. In addition, as a production process, it is necessary to first attach a sheet to the frame, and further adhere a metal mask, resulting in a large number of work steps and poor productivity.

  There is known a printing plate that eliminates the need for a sheet and that allows a metal mask to be directly attached to and detached from a frame, resulting in a reduction in storage space (see, for example, Patent Document 1). In the printing plate of Patent Document 1, a metal mask is directly attached to a frame, and tension is applied to the metal mask by pulling the metal mask obliquely downward.

  However, in order to pull the metal mask obliquely downward, it is necessary to employ a complicated structure, which is not preferable from the viewpoint of productivity. Further, when pulling the metal mask outward, if the pin is pulled as it is as in Patent Document 1, force is also applied to the pin hole outward, so the pin hole is directed outward. There is a possibility of swelling. For this reason, there is a possibility that the tension of the metal mask is lowered by repeated use. On the other hand, since tension is applied when the metal mask is used, the metal mask may jump up from the frame due to some action, which must be prevented.

Japanese Patent No. 2989180

  The present invention is based on the above prior art, and provides a screen printing plate that prevents the metal mask from jumping up during use, and can suppress deterioration of the portion where the metal mask is pulled with a simple structure as much as possible. The purpose is to do.

  In order to achieve the above object, in the present invention, a metal-made thin plate-shaped metal mask, a sandwiched region formed as a constant region at the periphery of the metal mask, and a periphery of the metal mask including the sandwiched region A frame arranged on the base, a pedestal provided to project along the frame, a reference surface formed as a surface including the metal mask when the metal mask is placed on the pedestal, and a pedestal A cover for covering the sandwiched area on the outside, and a cover for sandwiching the sandwiched area in cooperation with the pressing surface and a pressing area that is a part of the surface of the frame, and the presser An engaging member for fixing the sandwiched region of the metal mask to the frame in the region, and a moving unit that is accommodated in the frame and moves the engaging member in the holding region. Provided, in a state where the sandwiched area is sandwiched between the pressing surface and the pressing area, the sandwiched area is substantially parallel to the reference surface, and the pressing surface is at a position lower than the reference surface, The engagement member may be moved in a direction parallel to the reference plane toward the inner side and the outer side of the frame by the moving unit.

  Preferably, a plurality of pin holes are formed in the sandwiched area along an outer edge of the metal mask, and the engaging member is a pin protruding from the pressing area.

  Preferably, an outer edge of the metal mask is bent to form a reinforcing margin toward the inside, and the inner edge of the reinforcing margin is along the outermost edge of the pin hole.

  According to the present invention, since the pressing surface is at a position lower than the reference surface, the metal mask is pulled outward to some extent when the sandwiched area is covered with the cover. For this reason, the metal mask can be securely fixed to the frame together with the engaging member while applying a certain amount of tension to the metal mask. Furthermore, when applying tension to the metal mask, the engaging member may be moved outward using the moving unit. Thereby, an appropriate tension can be applied to the metal mask. At this time, since the metal mask is pressed by the cover in a certain area called the sandwiched area, it is possible to prevent the tensioned metal mask from jumping up during use. Further, pressing with the surface can reduce the load of the portion where the metal mask is pulled when the engaging member is moved to some extent, so that deterioration can be suppressed as much as possible. Since the moving direction of the engaging member is parallel to the reference plane, it can be realized with the simplest structure for pulling the metal mask outward.

  If the engaging member is a plurality of pins and the pin is inserted into a plurality of pin holes provided in the sandwiched area and fixed, the pin moves outward and the outer edge of the pin hole is pulled. However, since the sandwiched area in which the pin hole is formed by the cover is pressed by the surface, the pin hole can be prevented from spreading and the deterioration of the pin hole can be suppressed as much as possible.

  In addition, if the metal mask is provided with a reinforcement allowance at the outer edge of the metal mask, it functions as a reinforcement for the outer edge of the pin hole when the metal mask is pulled by the pin. Can be prevented.

1 is a schematic plan view of a screen printing plate according to the present invention. FIG. 2 is an enlarged view of part A in FIG. It is a schematic plan view of a frame. FIG. 4 is an enlarged view of part B in FIG. It is a schematic sectional drawing before installing a metal mask in a flame | frame. It is a schematic sectional drawing after installing a metal mask in a flame | frame. It is a schematic plan view of a metal mask. It is a schematic plan view of another screen printing plate according to the present invention. It is the F section enlarged view of FIG. It is CC sectional drawing of FIG. 8, and shows the state which the cover opened. It is a schematic plan view when provisional tension is given to a metal mask. It is the G section enlarged view of FIG. It is DD sectional drawing of FIG. It is a schematic plan view when tension is further applied to the metal mask from temporary tension. It is the H section enlarged view of FIG. It is EE sectional drawing of FIG.

  As shown in FIG. 1, the screen printing plate 1 according to the present invention includes a metal mask 2 and a frame 3. The metal mask 2 has a thin plate shape made of metal (for example, stainless steel), and a printing region 4 is formed at a substantially central portion. A large number of filling holes 5 penetrating the metal mask 2 are formed in the printing region 4. The filling hole 5 is for filling a paste (for example, a solder paste) at the time of printing. The shape, position, etc. with respect to the metal mask 2 are different for each metal mask 2 and are adjusted to the substrate at the time of board production. Select metal mask 2 to use.

  The frame 3 is disposed on the periphery of the metal mask 2 and holds and fixes the metal mask 2. Specifically, the frame 3 holds and fixes the sandwiched area 6 formed as a fixed area on the periphery of the metal mask 2. Therefore, the frame 3 is disposed on the periphery of the metal mask 2 including the sandwiched region 6. The metal mask 2 is held by a pin 7 that is an engaging member provided on the frame 3, and the pin 7 has a structure that directly engages the metal mask 2. Specifically, the pin 7 provided in the frame 3 is engaged with a plurality of pin holes 8 formed at intervals along the periphery of the metal mask 2. The sandwiched area 6 of the metal mask 2 in which the pins 7 are inserted is covered with a cover 9 provided on the frame 3. The cover 9 is formed so as to be rotatable with respect to the frame 3 via a rotary shaft 10.

  The frame 3 has a pedestal 11 provided so as to protrude along the frame shape of the frame 3. This pedestal 11 is fixed to the frame 3 by a plurality of screws 12. As apparent from FIG. 3, when the frame 3 has a substantially rectangular shape, the base 11 is also arranged on the frame 3 in a substantially rectangular shape along the same. The metal mask 2 is placed on the pedestal 11. A reference surface 13 is formed as a surface including the metal mask 2 when the metal mask 2 is placed on the base 11.

  The cover 9 described above has a pressing surface 14 for covering the sandwiched area 6 outside the pedestal 11. That is, the pressing surface 14 is the back surface of the cover 9 and is a surface on the side in contact with the sandwiched area 6. On the other hand, when the cover 9 is closed, the portion of the frame 3 that faces the pressing surface 14 is formed as a pressing region 15. That is, the holding area 15 is a part of the surface of the frame 3 and is a part in contact with the sandwiched area 6. When the cover 9 is closed by rotating around the rotation shaft 10, the sandwiched area 6 of the metal mask 2 is sandwiched between the pressing surface 14 and the pressing area 15.

  The pin 7 described above is formed in the holding area 15. Specifically, it is provided to project upward through a long hole 16 extending in the inner and outer directions of the frame 3.

  Here, a moving unit 17 is accommodated in the frame 3. The moving unit 17 includes an air tube 18, a moving block 19, and a spring 20. The air tube 18 has an intake / exhaust port 21 for intake and exhaust of air at one end, and is disposed on the outer side of the frame 3 along the periphery of the frame 3. The moving block 19 is disposed in contact with the inside of the air tube 18. The lower end of the moving block 19 or the pin 7 is embedded. Therefore, the pin 7 moves together with the moving block 19. The spring 20 is disposed in contact with the inside of the moving block 19. With this structure, when air is sucked into the air tube 18, the spring 20 contracts and the moving block 19 moves inward (state shown in FIG. 5). When air is exhausted from the air tube 18, the spring 20 extends and the moving block 19 moves outward (state shown in FIG. 6). As the moving block 19 moves, the pin 7 moves in the long hole 16 in the inner and outer directions.

  When the metal mask 2 is fixed to the frame 3, it is performed as follows. First, air is supplied from the intake / exhaust port 21 and the air tube 18 is expanded. Along with this, the spring 20 is contracted to move the moving block 19 inward. In this state, the cover 9 is opened upward (state shown in FIG. 5). Then, the metal mask 2 is placed on the base 11. As a result, the metal mask 2 is placed on the pedestal 11 along the reference surface 13. When placing on the pedestal 11, the pins 7 are inserted into the pin holes 8 formed along the periphery of the metal mask 2. Therefore, the metal mask 2 is held to some extent by the pins 7 while being placed on the base 11. Then, the cover 9 is rotated around the rotation shaft 10 (in the direction of arrow C in FIG. 5), and the cover 9 is closed. Thus, the sandwiched area 6 of the metal mask 2 is sandwiched between the pressing surface 14 and the pressing area 15.

  At this time, the cover 9 is held in a state of covering the sandwiched area 6 by the lock unit 22. The lock unit 22 includes a receiving body 23 that protrudes from the frame 3 and a rod body 24 that is accommodated in the cover 9. The rod body 24 can be moved in the cover 9 inward and outward with respect to the frame 3 by a spring 25. When the cover 9 is lowered, the tip of the rod body 24 comes into contact with the receiving body 23, and the rod body 24 is moved outwardly against the spring 25 along the inclined surface provided at the tip of the rod body 24. The receptacle 23 is formed with a hole 26 that can receive the tip of the rod 24, and when the cover 9 is lowered, the tip of the rod 24 is received in the hole 26. As a result, the cover 9 is kept closed by the lock unit 22. Note that the holding of the cover 9 may be manually performed by an operator without being automatically performed.

  The state in which the sandwiched region 6 on the periphery of the metal mask 2 is covered with the cover 9 in this way is called a so-called temporary tension state. This is because the pressing surface 14 is at a position lower than the reference surface 13 in a state where the cover 9 is closed, and thus the metal mask 2 is pulled outward by the cover 9 to some extent. For this reason, the metal mask 2 can be reliably fixed to the frame 3 together with the pins 7 as the engaging members while applying a certain amount of tension to the metal mask 2. At this time, the sandwiched region 6 is maintained in a state substantially parallel to the reference surface 13.

  In such a temporary tension state, the air in the air tube 18 is exhausted from the intake / exhaust port 21 and the spring 20 is extended. Thereby, the movement block 19 moves outside and the pin 7 also moves outside. Therefore, the metal mask 2 is pulled outward by the movement of the pin 7 and is further tensioned. Thereby, an appropriate tension can be applied to the metal mask 2. At this time, since the metal mask 2 is pressed by the cover 9 in a certain area called the sandwiched area 6, it is possible to prevent the tensioned metal mask 2 from jumping up during use. In addition, pressing on the surface can reduce the load on the portion where the metal mask 2 is pulled when the engaging member (pin 7) is moved to some extent, so that deterioration of the pin hole 8 can be suppressed as much as possible.

  That is, if the engaging member is a plurality of pins 7 as shown in the figure and the pin 7 is inserted into a plurality of pin holes 8 provided in the sandwiched region 6 and fixed, the pin 7 is outward. Even if the outer edge of the pin hole 8 is pulled and the pinched region 6 where the pin hole 8 is formed by the cover 9 is pressed by the surface, the pin hole 8 can be prevented from spreading. The deterioration of the pin hole 8 can be suppressed as much as possible. In addition, since the moving direction of the engaging member (pin 7) is parallel to the reference surface 13, a complicated structure is not required to pull the metal mask 2 outward (such as pulling diagonally downward). Complex structure is not required), and it can be realized with the simplest structure.

  As apparent from FIG. 7, the metal mask 2 has a plurality of pin holes arranged in a line along the periphery thereof at intervals. As described above, when the pin 7 is inserted and moved outward, the outer edge of the pin hole 8 is pulled, so that the pin hole 8 may spread outward. By covering the sandwiched region 6 in which the pin hole 8 is formed on the holding surface 14 with the cover 9, such deterioration of the pin hole 8 can be prevented, but the following structure is adopted to further enhance the effect. It is preferable.

  That is, the reinforcing margin 27 is provided on the outer edge of the metal mask 2. The reinforcement allowance 27 is formed outward from the outer edge of the metal mask 2 and is formed toward the inside of the metal mask 2 by bending. The reinforcement margin 27 after bending is along the outermost edge of the pin hole of the pin hole 8 as shown by a broken line in FIG. As described above, if the reinforcing margin 27 is provided on the outer edge of the metal mask 2, the metal mask 2 functions as a reinforcement of the outer edge portion of the pin hole 8 when the metal mask 2 is pulled by the pin 7. It is possible to prevent the hole 8 from expanding and deforming.

  Further, by providing such a reinforcing allowance 27, the outer edge of the metal mask 2 becomes a bent portion of the metal plate, so that the cut edge of the metal plate is not exposed. Therefore, it is possible to improve safety and handleability when handling the metal mask 2.

  Another embodiment different from the above will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to what has the effect similar to the said Example, and description is abbreviate | omitted.

  The screen printing plate 31 of the embodiment shown in FIG. 8 is different from the screen printing plate 1 described above in the structure of the cover. The cover 32 of this embodiment can be rotated in the direction indicated by the arrow F in FIG. 10 with the rotary shaft 10 as a support shaft, but a plurality of long holes 34 capable of receiving the lock pins 33 are formed in the longitudinal direction. ing. The long hole 34 is formed to extend in the inner and outer directions of the cover 32. The lock pin 33 protrudes upward from the frame 3. The cover 32 is opened when it is rotated upward, and is closed when it is rotated downward. In the closed state, the lock pin 33 is accommodated in the long hole 34 (see FIG. 9). Further, the rotary shaft 10 can slide in a long hole 36 provided in the corner member 35 of the frame 3 located on both sides of the cover 32. By sliding the rotary shaft 10 in the long hole 36, the cover 32 slides inward and outward of the frame 3.

  When setting the metal mask 2, first, the metal mask 2 is placed on the base 11. The print area 4 is omitted. Thereafter, the cover 32 is closed. Then, the rotating shaft 10 is moved outward along the long hole 36 with respect to the frame 3. Then, as shown in FIG. 11, the cover 32 also moves outward with respect to the frame 3. Here, the long hole 34 is formed with a reduced diameter in the inner direction of the frame 3. As the cover 32 moves outward, the lock pin 33 enters the reduced diameter portion 34a of the elongated hole 34 (see FIG. 12). Thereby, it is possible to prevent the head portion 33a of the lock pin 33 from being caught by the reduced diameter portion 34a and the cover 32 from being accidentally opened.

  By moving the cover 32 to the outside in this manner, the metal mask 2 is sandwiched between the cover 32 and the frame 3 and a temporary tension is applied. Even in this state, since the head portion 33 is caught by the reduced diameter portion 34a, the cover 32 is not opened.

  Then, by exhausting the air in the air tube 18, the pin 7 is moved outward, and further tension is applied to the metal mask 2. Also in this embodiment, the tension can be applied by the pins 7 while the metal mask 2 is reliably suppressed by the cover 32. The cover 32 of this embodiment has a step on the lower surface, and the metal mask 2 is bent in two stages by the step when sandwiched between the cover 32 and the frame 3.

1: screen printing plate, 2: metal mask, 3: frame, 4: printing area, 5: filling hole, 6: sandwiched area, 7: pin, 8: pin hole, 9: cover, 10: rotating shaft, 11 : Pedestal, 12: Screw, 13: Reference surface, 14: Holding surface, 15: Holding area, 16: Long hole, 17: Moving unit, 18: Air tube, 19: Moving block, 20: Spring, 21: Intake and exhaust Mouth, 22: Lock unit, 23: Receptor, 24: Rod, 25: Spring, 26: Hole, 27: Reinforcement allowance, 31: Screen printing plate, 32: Cover, 33: Lock pin, 33a: Head part, 34: long hole, 34a, reduced diameter part, 35: corner member, 36: long hole

Claims (3)

Metal and thin metal mask,
A sandwiched area formed as a constant area on the periphery of the metal mask;
A frame disposed on the periphery of the metal mask including the sandwiched area;
A pedestal provided projecting along the frame;
A reference surface formed as a surface including the metal mask when the metal mask is placed on the pedestal;
A cover having a pressing surface for covering the sandwiched area outside the pedestal, and sandwiching the sandwiched area in cooperation with the pressing surface and a pressing area that is a part of the surface of the frame; ,
An engaging member for fixing the sandwiched region of the metal mask to the frame in the holding region;
A moving unit housed in the frame for moving the engaging member in the holding region;
In a state where the clamped area is clamped by the pressing surface and the pressing area, the clamped area is substantially parallel to the reference surface, and the pressing surface is at a position lower than the reference surface,
The screen printing plate according to claim 1, wherein the engaging member moves in a direction parallel to the reference plane toward the inside and the outside of the frame by the moving unit. In the sandwiched region, a plurality of pin holes are formed along the outer edge of the metal mask,
The screen printing plate according to claim 1, wherein the engaging member is a pin protruding from the pressing region. The metal mask has an outer edge bent and a reinforcement margin is formed toward the inside.
The screen printing plate according to claim 2, wherein an inner edge of the reinforcing margin is along an outermost edge of the pin hole.

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