WO2013014781A1

WO2013014781A1 - Screen printing plate

Info

Publication number: WO2013014781A1
Application number: PCT/JP2011/067219
Authority: WO
Inventors: 久保田　真司; 章稔木村; 昌文土屋; 山本　晃
Original assignee: 株式会社メイコー
Priority date: 2011-07-28
Filing date: 2011-07-28
Publication date: 2013-01-31

Abstract

This screen printing plate is provided with the following: a metal plate-shaped metal mask (2); a printing region formed in roughly the center of the metal mask (2) and comprising a plurality of filling holes for loading a paste material to be printed onto a substrate; a frame (3) for retaining and securing a peripheral edge portion (2a) of the metal mask; a retaining means (7) that is provided on the frame (3) and engages directly with the metal mask (2); a movable pedestal (10) that is provided on the frame (3), substantially encloses the printing region inward of the peripheral edge portion (2a), and is in contact with one surface of the metal mask (2); an elastic body (11) that is provided on the frame (3), causes the movable pedestal (10) to move in a direction perpendicular to the metal mask (2) while maintaining contact with the movable pedestal (10), and is used for impelling the metal mask (2) to maintain a state of compression; and a switching means (12) for switching between compression and release of the elastic body (11).

Description

Screen printing version

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 metal mask to this 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.

A printing plate is known in which a sheet is not required and a metal mask can be directly attached to and detached from the 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. In order to pull the metal mask and maintain the tension, a pressing force using air pressure in the air tube is used.

However, since the air in the air tube tends to decrease with time, the tension holding time is limited. In addition, since the tension changes in a decreasing direction with the passage of time, a constant tension cannot be maintained.

Japanese Patent No. 2989180

The present invention provides a screen printing plate that can hold the tension of a metal mask constant over a long period of time, eliminates the need for a sheet, reduces the number of parts, and reduces the storage space.

The present invention relates to a metal mask in the form of a metal plate, a printing region formed in a substantially central portion of the metal mask and including a plurality of filling holes for filling a paste material to be printed on a substrate, and a periphery of the metal mask. A frame that holds and fixes the portion, a holding means that is provided on the frame and that directly engages the metal mask, and that is provided on the frame and substantially surrounds the printing area on the inner side of the peripheral edge, A moving pedestal that is in contact with one surface of a metal mask and the frame are provided on the frame, and the moving pedestal itself is moved in a direction perpendicular to the metal mask while being in contact with the moving pedestal, and is attached to the metal mask. A screen printing plate comprising an elastic body for maintaining a pressed state and switching means for switching compression and release of the elastic body.

Preferably, the elastic body is a spring arranged so as to expand and contract in the moving direction of the moving base, and the switching means engages with the moving base and resists the elasticity of the spring in the compressing direction. An air cylinder that moves and releases the engagement with the moving base.

Preferably, the holding means is inserted from a plurality of pin holes formed at intervals along the peripheral edge, and from a surface side opposite to the surface on which the movable base is in contact with the pin holes. And a holding member that is provided at the tip of the pin and that holds the metal mask together with the frame and presses the peripheral edge against the surface of the frame.

Preferably, a through-hole penetrating the metal mask is intermittently provided along a portion where the metal mask contacts the moving base.

According to the present invention, the movable pedestal itself moves in a direction perpendicular to the metal mask to push up the metal mask, and the pressing force for pushing up is held by the elastic body (for example, a spring). Therefore, the tension of the metal mask can be kept constant for a long time. The pressing force by the elastic body can be easily released by compressing the spring with an air cylinder or the like. In addition, since the frame is directly engaged with the metal mask via the holding means to fix the metal mask, a conventional sheet (saddle) is not required, the number of parts can be reduced, and the manufacturing process can be simplified. . The holding means can be easily realized by adopting a structure in which, for example, a pin provided in the frame is inserted into a pin hole provided in the metal mask. In addition, since the metal mask can be detached from the frame if the engagement by the holding means is released, a plurality of metal masks can be applied to one frame, and the storage space can be reduced.

1 is a schematic plan view of a screen printing plate according to the present invention. 1 is a schematic side view of a screen printing plate according to the present invention. It is a schematic plan view of a frame. It is a schematic side view of a frame. It is the schematic of the state which mounted the metal mask in the flame | frame. It is the schematic inside a frame in the state where the spring was compressed. FIG. 7 is a schematic plan view of FIG. 6. FIG. 7 is a schematic side view of FIG. 6. It is the schematic of the state by which the metal mask was fixed to the flame | frame. It is the schematic inside a flame | frame in the state by which the spring was released. It is a schematic plan view of FIG. It is a schematic side view of FIG. It is the schematic which shows the modification of a metal mask.

The screen printing plate 1 according to the present invention is formed of a metal mask 2 and a frame 3. As shown in FIG. 1, the metal mask 2 has a 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, solder paste) at the time of printing, and the shape, position, etc. with respect to the metal mask 2 are different for each metal mask 2, and a metal suitable for the substrate is manufactured at the time of manufacturing the substrate. Mask 2 is selected and used.

The frame 3 holds and fixes the peripheral edge 2a of the metal mask 2. This holding is performed by holding means provided on the frame 3, and this holding means has a structure that directly engages the metal mask 2. Specifically, the pin 6 provided in the frame 3 is fixed by being inserted into a plurality of pin holes 2 b formed at intervals along the peripheral edge 2 a of the metal mask 2. In addition, you may form the reinforcement board for reinforcement in the position which forms the pin hole 2b. The metal mask 2 into which the pins 6 are inserted is further sandwiched by the holding member 7 provided on the frame 3 at the peripheral edge 2a. The holding member 7 is formed to be rotatable with respect to the frame 3 via a hinge 8. The frame 3 is generally 650 (mm) × 550 (mm).

Operations for fixing the metal mask 2 as described above to the frame 3 will be described in order.
First, as shown in FIG. 5, the metal mask 2 is placed on the frame 3. At this time, the metal mask 2 is positioned and placed using, for example, positioning pins 9 formed at four corners (see FIG. 1). When the metal mask 2 is placed on the frame 3, the metal mask 2 is actually placed on the moving base 10 provided on the frame 3. In other words, the movable pedestal 10 is in contact with one surface (lower surface) of the metal mask 2. The movable pedestal 10 substantially surrounds the printing area 4 on the inner side of the peripheral edge 2 a of the metal mask 2. That is, the movable base 10 is formed inside the pin 6 in the frame 3 (see FIG. 3).

An elastic body is disposed below the movable base 10. This elastic body is, for example, a spring 11, which is disposed so that the expansion / contraction direction is orthogonal to the metal mask 2 and is disposed in contact with the movable base 10 (in the state of FIG. 5, the spring 11 is compressed and held). State.) Therefore, the moving base 10 moves in a direction perpendicular to the metal mask 2 by the extension of the spring 11. That is, when the spring 11 is released, the movable base 10 pushes the metal mask 2 upward. A plurality of springs 11 are provided on each side of the frame 3.

Here, the frame 3 has a hollow shape composed of a receiving body 3a and a covering body 3b, and switching means for switching compression and release of the spring 11 is arranged in the hollow space 3c. The switching means is, for example, an air cylinder 12 (see FIGS. 6 and 7). When air is supplied to the air cylinder 12, the cylinder rod 13 extends. An engagement member 14 is attached to the tip of the cylinder rod 13. The engaging member 14 is engaged by pressing the protrusion 15 protruding to the side of the movable base 10 from above. Specifically, as shown in FIG. 8, the engaging member 14 has a slope surface 14 a that falls from the front end side toward the rear end side, and the protrusion 15 is positioned below the slope surface 14 a. Yes. Therefore, when the air cylinder 13 is extended, the protrusion 15 is lowered while moving relatively to the rear end side of the engaging member 14 along the inclined surface 14a. In a state where the air cylinder 13 is fully extended, the protrusion 15 is positioned on the lowermost side by the engaging member 14. As a result, the spring 11 disposed on the lower side of the movable pedestal 10 is contracted, and the state shown in FIG. In other words, the air cylinder 12 is engaged with the moving base 10 via the cylinder rod 13, the engaging member 14, and the protrusion 15, and the spring 11 is compressed against the elasticity of the spring 11 to lower the moving base 10. .

As is clear from FIG. 3, a plurality of air cylinders 12 are arranged on each side of the frame 3 (two on the short side and three on the long side in FIG. 3). 12 is formed along each side of the frame 3, and is connected to the inlet 12 a of each air cylinder 12. An air supply port 16 a and an air discharge port 16 b are formed in the supply path 16, and the supply port 16 a and the discharge port 16 b are exposed to the side of the frame 3.

Then, the holding member 7 is rotated via the rotation shaft 17 provided in the hinge 8 (in the direction of arrow A in FIG. 5), and the pin 6 provided at the tip of the holding member 7 is inserted into the pin hole 2b. That is, the pin 6 is inserted into the pin hole 2b from the surface (upper surface) side opposite to the surface (lower surface) on which the movable base is in contact with the metal mask 2, and the peripheral edge portion 2a of the metal mask is connected to the holding member 7. It is sandwiched between the frame 3 (specifically, the covering body 3b) and pressed against the surface of the frame 3 (see FIG. 9). A through hole 7 a is formed in the holding member 7, and a pin 18 erected from the frame 3 is inserted into the through hole 7 a as the holding member 7 rotates. The pin 18 is a lock mechanism that restricts the holding member 7 from rotating upward again.

Then, when air is discharged from the air cylinder 12, the cylinder rod 13 contracts (see FIGS. 10 and 11), and the protrusion 15 moves toward the distal end side of the engaging member 14 along the gradient surface 14a. Therefore, the protrusion 15 rises. As the projection 15 rises, the compression of the spring 11 is released, and the spring 11 moves (rises) the moving base 10 itself in a direction perpendicular to the metal mask 2 while abutting against the moving base 10. And it biases in the state which pressed the metal mask 2 upwards with the elastic force of the spring 11, and the state is maintained in the balanced position (state of FIG. 9). In this state, the force acting to push up the metal mask 2 is only the spring 11, and thus the protrusion 15 is away from the engaging member 14 (see FIG. 12).

Thus, the movable base 10 itself moves in a direction orthogonal to the metal mask 2 to push up the metal mask 2, and the pressing force for pushing up is held by the elastic body (for example, the spring 11). Therefore, the tension of the metal mask 2 can be kept constant for a long time. Release of the pressing force by the elastic body 11 can be easily performed by compressing the spring 11 with the air cylinder 12 or the like. The expansion and contraction and release of the spring 11 are not limited to the air cylinder 12 described above, and an air hose, a mechanical member, or the like may be used. Thus, a certain tension can be given to the metal mask 2 by directly pushing up in the direction orthogonal to the metal mask 2, and the tension can be held semipermanently by using this pushing force with an elastic body.

In addition, since the frame 3 is directly engaged with the metal mask 2 via the holding means (holding member 7) to fix the metal mask 2, a sheet (saddle) as in the prior art becomes unnecessary, and the number of parts can be reduced. The process can also be simplified. As described above, the holding member 7 can be easily realized by, for example, a structure in which the pin 6 provided in the frame 3 is inserted into the pin hole 2b provided in the metal mask 2, for example. In addition, since the metal mask 2 can be detached from the frame 3 if the engagement by the holding member 7 is released, a plurality of metal masks 2 can be applied to one frame 3, and the storage space can be reduced. it can.

Here, as shown in FIG. 13, the through holes 19 may be provided intermittently along the portion where the movable base 10 of the metal mask 2 contacts. Thereby, when the movable base 10 rises and pushes up the metal mask 2, the bending strength at this portion can be weakened. Therefore, the so-called stiffness of the metal mask 2 at the portion is weakened, and the central portion (print region 4) of the metal mask 2 can be prevented from swelling upward. That is, when the metal mask 2 is set, the cross-sectional dome shape is prevented, the tension at the central portion is increased, and an appropriate tension can be maintained. The through hole 19 is preferably formed so as to cross the contact surface of the movable base 10 with respect to the metal mask 2.

DESCRIPTION OF SYMBOLS 1 Screen printing plate 2 Metal mask 2a Peripheral part 2b Pin hole 3 Frame 3a Receptacle 3b Cover 3c Hollow space 4 Printing area 5 Filling hole 6 Pin 7 Holding member 8 Hinge 9 Positioning pin 10 Moving base 11 Spring (elastic) body)
12 Air cylinder (switching means)
13 Cylinder rod 14 Engagement member 15 Protrusion 16 Supply path 17 Rotating shaft 18 Pin 19 Through hole

Claims

A metal mask in the form of a metal plate;
A printing region formed in a substantially central portion of the metal mask and including a plurality of filling holes for filling a paste material to be printed on the substrate;
A frame for holding and fixing a peripheral portion of the metal mask;
Holding means provided on the frame and directly engaging the metal mask;
A movable pedestal that is provided on the frame, substantially surrounds the printing region on the inner side of the peripheral edge, and is in contact with one surface of the metal mask;
An elastic body provided on the frame for moving the moving base itself in a direction perpendicular to the metal mask while being in contact with the moving base, and maintaining a state of being urged and pressed against the metal mask; ,
A screen printing plate comprising switching means for switching compression and release of the elastic body.
The elastic body is a spring arranged to expand and contract in the moving direction of the moving base,
2. The air cylinder according to claim 1, wherein the switching means is an air cylinder that engages with the movable base, moves in a compression direction against the elasticity of the spring, and releases the engagement with the movable base. A screen printing plate as described in 1.
The holding means is
A plurality of pin holes formed at intervals along the peripheral edge;
A pin inserted from the surface opposite to the surface with which the movable base is in contact with the pin hole;
2. The screen printing plate according to claim 1, further comprising a holding member provided at a tip of the pin and holding the metal mask together with the frame to press the peripheral portion against the surface of the frame.
The screen printing plate according to claim 1, wherein a through-hole penetrating the metal mask is provided intermittently along a portion where the metal mask contacts the moving base.