JP2006187904A - Screen printing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen printing equipment, with which printing quality is ensured and through the simple structure of which the paste remaining in a squeegee head can be reduced as small as possible. <P>SOLUTION: In the screen printing equipment, in which printing is performed on a substrate 3 through the patterned holes 12a in a mask plate 12 by pressurizing a cream solder 50 with a pressurizing piston 32 while moving a squeegee head 13 stored with the cream solder 50 housed in a downward opened flexible interchanging type paste pack 31, the squeegee head 13 is equipped with a pack housing part 30 with the paste pack 31 housed therein and a tubular head main body part 14, at the lower part of which a delivering opening 37 with a printing space 38 formed by its inner wall is formed under the condition that the pressurizing piston 32 can be moved so as to pass through the delivering opening and enter the printing space and the outline of the pressurizing piston is so constituted as to have a form meeting the inner wall of the head main body part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a screen printing apparatus for printing paste that prints a paste agent such as cream solder on a circuit board on which electronic components are mounted or a substrate of a solar cell, for example.

  In recent years, screen printing apparatuses have been used in, for example, cream solder and conductive paste printing processes in circuit mounting processes for electronic components. The screen printing device is a device that sets a mask plate with pattern holes in accordance with the printing target part on the substrate, and prints paste such as cream solder on the substrate through the pattern holes of the mask plate by squeezing. It is.

  As this screen printing apparatus, an apparatus having a sealed squeegee head is known. This apparatus uses a hermetic squeegee head in which the paste is stored instead of directly supplying the paste onto the mask plate. In this apparatus, with the opening provided on the lower surface of the head main body being in contact with the mask plate, the paste discharged through the opening is applied to the pattern holes of the mask plate by pressurizing the paste in the head main body. Pushed in. Then, by sliding the squeegee head on the mask plate, the pattern holes are sequentially filled with paste (see, for example, Patent Document 1).

In the sealed squeegee head, the paste is supplied in a state of being stored in a dedicated container such as a cartridge in the squeegee head, unlike the conventional printing method in which the paste is directly supplied onto the mask plate. For this reason, when the paste is consumed in the process of continuing the printing operation, the paste is replenished by replacing with a new dedicated container. Patent Document 2 discloses an exchangeable container in which a paste is stored inside a flexible film-like material container opened at the bottom as a container for storing the paste instead of the cartridge. A screen printing apparatus using the above is disclosed.
JP 2001-246729 A JP 2004-017515 A

  However, the conventional screen printing apparatus employs a method of supplying a paste through each process shown in FIGS. 12A to 12G. Sealed squeegee heads using these cartridges or flexible membrane-like material containers cannot push the paste contained in the space under the squeegee head, and supply paste into the squeegee head more than necessary. There was a problem of conflicting material saving. That is, first, when a new paste is supplied, the squeegee head 113 sets the cartridge 131 a storing the paste 50 a in the internal region 134 of the pack housing part 130 as shown in FIG. 12A. A partition plate 133 having an opening is provided between the pack housing unit 130 and the printing unit main body 114. As shown in FIG. 12B, when the cartridge 131a is pressed by the pressing device 132, the viscosity of the paste 50a is lowered by passing through the opening provided in the partition plate, and is modified so that it can be easily discharged. The paste moves to the printing space 138 in the printing unit main body 114.

  If the paste 50a in the cartridge 131a is continuously pushed out by the pressing device 132 and moves into the printing space 138 (FIG. 12C), it cannot be pushed any further, so the cartridge 131a is removed as shown in FIG. 12D.

  Next, as shown in FIG. 12E, the second cartridge 131b is set in the pack housing portion 130, and the paste 50b in the cartridge 131b is discharged by the pressing device 132. Since the paste 50a stored in the first cartridge is stored in the print space 138, the paste is discharged from the discharge opening 137 of the squeegee head when the paste 50b is pushed out (FIG. 12F) and printing is possible. It becomes a state. That is, in order to start printing with a new paste, it is necessary to replace the cartridge, and there is a problem that the time and effort required to start printing becomes complicated.

  Also, as shown in FIG. 12G, when the pressing device 132 uses up the paste 50b in the second cartridge 131b, the paste 50b remains in the print space 138. The paste 50b remaining in the printing space 138 could not be used for printing unless a new cartridge was set. Therefore, for example, when the paste type is switched, the paste 50b remaining in the printing space 138 must be discarded, which is a problem from the viewpoint of saving materials.

  Therefore, in view of the above problems, the technical problem to be solved by the present invention is to provide a screen printing apparatus capable of ensuring the printing quality and reducing the paste remaining on the squeegee head as much as possible with a simple configuration. is there.

  In order to solve the above technical problems, the present invention provides a screen printing apparatus having the following configuration.

According to the first aspect of the present invention, an exchangeable paste pack in which a paste is stored inside a flexible membrane-like container that is open on one side can be accommodated so that the opening faces downward, and the bottom portion. A squeegee head that discharges the paste from a discharge opening provided in the device, and a pressurizing device that includes a piston that presses down on an upper surface of the accommodated paste pack and pressurizes the paste by moving the piston. And a screen printing apparatus that prints the paste on the printed material through the pattern holes of the mask plate by pressing and moving the squeegee head in a state where the paste is pressed onto the mask plate,
The squeegee head is
A cylindrical pack accommodating portion having a delivery opening having a size substantially the same as the opening of the paste pack below, accommodating the paste pack, and capable of arranging the piston above the accommodated paste pack;
A cylindrical head that is connected to the lower part of the pack housing part, has an opening of the same size as the delivery opening of the pack housing part and an ejection opening in the lower part, and has a printing space formed inside. The main body,
A paste pack fixing part that detachably fixes the paste pack so that the opening of the paste pack is positioned at the opening for delivery of the pack housing part,
The screen printing apparatus, wherein the piston is movable to the printing space through the delivery opening and has an outer shape configured along the inner wall of the head main body. I will provide a.

  In the above aspect, the screen printing apparatus has a sealed squeegee head that uses an exchangeable paste pack in which paste is stored inside a flexible film-like material container that is open at the bottom. The paste pack is accommodated in the pack accommodating portion so that the opening of the paste pack is positioned in the opening for delivery of the pack accommodating portion. Below the opening of the paste pack, an opening of the head main body having approximately the same size as the delivery opening of the pack housing is located, and the piston in the pack housing is configured to be movable into the printing space. .

  Therefore, when the piston moves into the printing space, the paste pack composed of the flexible film-like material container is deformed and enters the printing space. In addition, since the outer shape of the piston is configured in a shape along the inner wall of the head main body, the flexible film constituting the paste pack can be deformed according to the shape of the inner wall of the head main body, The paste in the paste pack can be discharged without remaining amount.

  According to the first aspect of the present invention, as described above, since the paste in one paste pack can be used without remaining in the squeegee head, waste of the paste can be reduced. Also, when switching paste types, etc., paste can be ejected and printing can be executed with only one paste pack, so printing can be started without replacing the paste pack as in the prior art. it can. Moreover, since there is little paste remaining in the printing space, the amount of paste discarded without being used can be greatly reduced.

  Next, before describing the screen printing apparatus according to the embodiment of the present invention in detail, various aspects of the present invention will be described.

According to the first aspect of the present invention, an exchangeable paste pack in which a paste is stored inside a flexible membrane-like container that is open on one side can be accommodated so that the opening faces downward, and the bottom portion. A squeegee head that discharges the paste from a discharge opening provided in the device, and a pressurizing device that includes a piston that presses down on an upper surface of the accommodated paste pack and pressurizes the paste by moving the piston. And a screen printing apparatus that prints the paste on the printed material through the pattern holes of the mask plate by pressing and moving the squeegee head in a state where the paste is pressed onto the mask plate,
The squeegee head is
A cylindrical pack accommodating portion having a delivery opening having a size substantially the same as the opening of the paste pack below, accommodating the paste pack, and capable of arranging the piston above the accommodated paste pack;
A cylindrical head that is connected to the lower part of the pack housing part, has an opening of the same size as the delivery opening of the pack housing part and an ejection opening in the lower part, and has a printing space formed inside. The main body,
A paste pack fixing part that detachably fixes the paste pack so that the opening of the paste pack is positioned at the opening for delivery of the pack housing part,
The screen printing apparatus, wherein the piston is movable to the printing space through the delivery opening and has an outer shape configured along the inner wall of the head main body. I will provide a.

  According to the first aspect of the present invention, the paste pack fixing portion sandwiches a flange portion positioned around the opening of the paste pack between the pack housing portion and the head main body portion. And a screen printing apparatus according to a first aspect, wherein the screen printing apparatus is configured by an upper surface of the head main body.

  According to the third aspect of the present invention, the head main body is pivotally supported by the pack housing so as to be detachable and connected to the pack housing so as to be openable and closable, and the flange is attached to the pack housing. A screen printing apparatus according to a second aspect is provided, comprising a head fixing portion that fixes the head main body portion in a closed state so as to be clamped.

  According to a fourth aspect of the present invention, the screen printing apparatus according to the second or third aspect, wherein the flange portion of the paste pack is configured to have the same size as the peripheral wall thickness of the pack housing portion. I will provide a.

  According to the fifth aspect of the present invention, the head main body portion includes a bar-like stirring member that extends along the extending direction of the discharge opening above the discharge opening, and the piston is the stirring member. There is provided a screen printing apparatus according to any one of the first to fourth aspects, which has a notch for preventing interference with the screen.

  Hereinafter, a screen printing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  First, the structure of the screen printing apparatus 100 will be described with reference to FIGS. In FIG. 1, a substrate positioning unit 1 is configured by stacking an X-axis table 2, a Y-axis table 3, a θ-axis table 4, and a Z-axis table 5. A lower receiving portion 6 that supports the substrate 7 is provided. The substrate 7 is clamped on both sides by the clamp portion 8 and held. By driving each axis table of the positioning unit 1, the substrate 7 held by the lower receiving unit 6 is positioned in the horizontal direction and the vertical direction.

  A screen mask 10 is disposed above the positioning unit 1. The screen mask 10 is configured by mounting a mask plate 12 on a holder 11, and a pattern hole 12 a corresponding to a head main body portion of a substrate 7 to be printed is opened in the mask plate 12. On the screen mask 10, a squeegee head 13 is disposed so as to be movable up and down by a head lifting unit 20. The squeegee head 13 is a hermetically sealed squeegee head capable of storing cream solder as a paste therein, and the squeegee head 13 moves while the lower surface is pressed against the mask plate 12, whereby the pattern hole of the mask plate 12 is moved. The cream solder as paste is printed on the substrate 7 through 12a.

  The head elevating unit 20 includes a cylinder 22 provided on the base member 21. By driving the cylinder 22, the squeegee head 13 moves up and down with respect to the mask plate 12, and the squeegee head 13 is pressed against the mask plate 12.

  Sliders 23 are fixed to both ends of the lower surface of the base member 21 of the head elevating unit 20, and the sliders 23 are slidably fitted to guide rails 24 disposed on the upper surface of the frame 25. A nut member 26 is coupled to the lower surface of the base member 21, and a feed screw 27 screwed into the nut 26 is rotationally driven by a motor 28.

  By driving the motor 28, the base member 21 moves horizontally, and thus the squeegee head 13 coupled to the head lifting / lowering unit 20 also moves horizontally. By driving the motor 28 with the squeegee head 13 lowered, the squeegee head 13 moves horizontally on the mask plate 12. The nut 26, the feed screw 27, and the motor 28 function as a moving device.

  Next, the squeegee head will be described. As shown in FIG. 3, the squeegee head includes a head main body portion 14 and a pack housing portion 30. Below the squeegee head 13 is provided a head main body 14 that contacts the surface of the mask plate 12 and fills the pattern holes 12a with cream solder as paste. The pack accommodating portion accommodates an exchangeable paste pack in which a paste is stored in a flexible film-like material container having a lower opening therein.

  First, the structure of the head main body 14 will be described. In FIG. 3, the head body 14 is a block-shaped cylindrical member that is elongated in the width direction of the mask plate 12. The upper side has a pressurizing opening 34 for pressurizing the paste, and the lower side has an opening 37 for discharging the paste. A printing space 38 is formed and accommodates a paste such as cream solder used for printing. The longitudinal dimension of the head main body 14 is set so as to cover the width dimension of the substrate 7 to be printed as shown in FIG. The head main body 14 is hinged to the lower side of the pack housing 30 to which the paste pack 31 in which the cream solder 50 is stored is detachably mounted.

  At the lower end of the head main body 14, plate-shaped blade portions 36A and 36B for changing the volume are provided. Each of the blade portions 36A and 36B is a member having a dimension substantially equal to the longitudinal dimension of the head main body 14 and forms a part of the bottom plate of the head main body 14 so that the central portion in the squeezing direction of the printing space is deep. Are arranged so as to be opposed to each other in the squeezing direction. A discharge opening 37 is defined between the blade portions 36A and 36B. When the squeegee head 13 is lowered, the lower end portions of the blade portions 36A and 36B are in contact with the surface of the mask plate 12, respectively. During the printing operation, the printing space 38 accommodates the pressurized cream solder 50, and the cream solder 50 is brought into contact with the surface of the mask plate 12 through the discharge opening 37 between the blade portions 36A and 36B.

  As shown in FIGS. 3 and 7, the pack housing portion 30 is mainly composed of a frame-like member, and the paste space 31 in which the cream solder 50 is stored is accommodated in the internal space 34 in a replaceable manner. The paste pack 31 is an exchangeable container formed by molding a flexible film-like material into a container shape, and has a shape in which the entire lower surface is opened in the mounting posture.

  An opening for fitting the pressurizing piston 32 that pressurizes the cream solder 50 accommodated therein is provided on the upper surface of the pack accommodating portion 30. The height dimension H of the pack accommodating portion 30 is configured such that when the paste pack is accommodated, the pressurizing piston 32 can be disposed on the upper side through the opening. The pressurizing piston 32 is coupled to the rod 16a of the cylinder 16 disposed above, and by driving the cylinder 16, the pressurizing piston 32 is printed on the pack housing portion 30 and the head main body portion 14 provided below the pack housing portion 30. It moves up and down in the space 38. The screen printing apparatus is configured to detect the movement width of the cylinder 16 and to detect the position of the pressure piston 32.

  Further, the lower end of the pack housing portion 30 is a delivery opening for feeding the cream solder 50 stored in the paste pack into the printing space 38 of the head main body portion 14. The pack storage unit 30 stores the paste pack 31 so that the opening for delivery coincides with the opening of the paste pack 31. The delivery opening is configured to have substantially the same size as the opening located above the head main body 14, and the pressurizing piston 32 can move into the printing space 38 as will be described later.

  The pack housing part 30 and the head main body part 14 are configured to be detachable, and both are fixed in a closed state. Specifically, the pack housing portion 30 and the head main body portion 14 are rotatably coupled via the hinge portion 20 (see FIGS. 4A to 4C), and the pack housing portion 30 is connected to the head main body portion 14. By reversing, the head main body part 14 and the pack housing part 30 can be opened or closed.

  Here, with reference to FIG. 4A, FIG. 4B, FIG. 4C, and FIG. 5, the coupling | bonding / separation of the head main-body part 14 and the pack accommodating part 30, and opening / closing operation | movement are demonstrated. As described above, the squeegee head 13 is divided into the pack housing portion 30 that houses the paste pack 31 and the head main body portion 14 that includes the printing space 38, and the head body portion 14 and the pack housing portion 30. Are hinge-coupled so as to be separable and openable / closable.

  As shown in FIG. 4A, a hinge plate 35 a provided with pins 35 is fixed to the side surface of the pack housing portion 30, and a hinge plate 20 provided with pin grooves 20 a is fixed to the upper surface of the head main body portion 14. . The hinge plate 20 is partially cut away, and a part of the upper portion of the pin groove 20a is opened. When the head main body 14 is attached to the lower side of the pack housing 30, the pin 35 is fitted into the pin groove 20a from the notch of the hinge plate 20 as shown in FIG. 4B. As a result, the head main body 14 is attached to the lower side of the pack housing 30 at the correct position.

  Further, as shown in FIG. 4B, a fastener 21a is provided on the head main body 14 as a head fixing portion for holding the head main body 14 and the pack housing 30 in a closed state. The fastener 21 a is pivotally supported by the fastener base portion 21, and the head main body portion 14 and the pack accommodation portion 30 are centered on the pin 35 by being fitted into a locking member 36 provided in the pack accommodation portion 30. Secure it so that it does not open. As will be described later, when the head main body portion 14 and the pack housing portion 30 are fixed in a closed state by the fasteners 21, the flange portion 31a of the paste pack is brought into contact with the head main body portion 14 and the pack housing portion 30. The paste pack 31 is fixed so as not to be displaced. In addition, the contact surface of the head main body 14 and the pack accommodating portion 30 may be provided with uneven portions that engage with each other so that the flange portion 31a of the paste pack can be firmly fixed.

  In this state, the head main body portion 14 and the pack housing portion 30 are reversed relative to each other with the pin 35 as a fulcrum, so that the head main body portion 14 is reversed and separated from the pack housing portion 30 as shown in FIG. . That is, the head body 14 can be opened and closed with the head body 14 pivotally supported by the pack housing 30. Accordingly, as shown in FIG. 5, the pack accommodating portion 30 can be in a posture in which the delivery opening is directed upward, and can be in a posture in which the paste pack 31 can be accommodated in the inside 34 thereof.

  Next, the structure of the paste pack 31 will be described with reference to FIGS. 6A and 6B. The paste pack 31 is manufactured by molding a flexible film material such as a resin film, and is configured to have substantially the same size and shape as the delivery opening located at the lower end of the pack housing 30 as shown in FIG. It is mainly composed of an elongated recess 31b. The film-like material is preferably a material that has elasticity and flexibility, is soft so that it can be easily turned over, and is slippery with respect to the piston 32. FIG. 6B shows a cross section of the paste pack 31, and the concave portion 31 b has a flat bottom shape in which the width B of the opening is larger than the depth D.

  From the outer peripheral part of the recessed part 31b, the flange part 31a which protrudes in the direction orthogonal to a recessed direction (horizontal direction in a mounting attitude | position) is formed. As will be described later, the flange portion 31a functions as a holding surface when the paste pack 31 is mounted on the pack housing portion 30, and is thus configured to have a width substantially the same as the width of the lower surface of the pack housing portion 30 and is concave. It is preferable that the rigidity is higher than that of the portion 31b. An adhesive sheet 40 having an adhesive layer on both sides is attached to the back surface of the flange portion 31 a, and the flange portion 31 a is attached and locked to the upper surface 30 a of the pack housing portion 30 by the adhesive sheet 40.

  A cover sheet member 41 made of a resin thin film is attached to the surface (surface opposite to the concave direction) of the flange portion 31a. By sticking the cover sheet member 41 to the flange portion 31a, the opening of the concave portion 31a is closed, and a closed paste containing space is formed between the concave portion 31a and the cover sheet member 41.

  The paste 50 such as cream solder is injected into the paste receiving space with the cover sheet member 41 partially peeled off, and then the cover sheet member 41 is entirely adhered to the flange portion 31a to be sealed. It is accommodated in the paste pack 31 in a state. Also, as a method of injecting the cream solder 5, the paste containing space 31c is filled with the cream solder 5 with a spatula or the like in a state where the concave portion 31a is fully opened, and then the cover sheet member 41 is entirely applied to the flange portion 31a. You may use the method of sticking to.

  FIG. 7 is an exploded view when a paste pack is set in the pack housing portion. FIG. 8 is a process diagram in the case where a paste pack is set in the pack housing portion. The pack accommodating portion 30 is a frame-like member that can accommodate a paste pack therein as described above, and the paste pack 31 has a pack accommodating portion so that the flange portion 31a is disposed on the lower side surface 30a of the pack accommodating portion. 30 is detachably accommodated.

  When the paste pack 31 is mounted, the concave portion 31 b is accommodated in the pack accommodating portion 30 such that the flange portion 31 a is placed on the outer surface of the pack accommodating portion 30 as shown in FIG. At this time, as shown in FIG.8 (b), the flange part 31a is stuck to the pack accommodating part 30 with the adhesive tape 40 (refer FIG. 6).

  Next, as shown in FIG. 9C, the cover sheet member 41 is peeled from the paste pack 31 that is latched and held in the pack housing portion 30. Thereby, the cream solder 5 accommodated inside the recessed part 31a will be in an exposed state.

  The head main body 14 is reversed, the head main body 14 is disposed above the pack housing 30 with the paste pack 31 mounted, and the fasteners 21 are fixed so that both are held closed. . In this operation, since the paste pack 31 is latched and held in the pack accommodating portion 30, there is no problem that the position of the paste pack 31 is shifted or dropped during movement or reversal. When both are closed by the fastener 21 a as described above, the flange portion 31 a of the paste pack 31 is sandwiched and fixed by the contact surface between the head main body portion 14 and the pack housing portion 30.

  Next, the process of discharging cream solder from the squeegee head on which the paste pack is mounted will be described. FIG. 9 is a process diagram showing a process of discharging cream solder. With the paste pack attached to the squeegee head, the squeegee head 13 is attached to the apparatus. At this time, as shown in FIG. 9A, the pressure piston 32 is inserted into the opening located above the pack housing portion 30 so that the paste pack 31 can be pressurized. As shown in FIG. 3, the pressurizing piston 32 is configured to be movable in the inner space 34 of the pack housing portion 30 and the printing space 38 of the head main body portion 14. And is configured to be substantially the same shape as the shape of the lower surface of the head main body 14.

  As shown in FIG. 9 (b), the concave portion 31b of the paste pack 31 is crushed by moving the pressure piston 32 downward in order to discharge the cream solder from the discharge opening 37. Printing in which the cream solder 50 is surrounded by a space in the head main body 14 from the paste pack, that is, a lower portion of the head main body 30 and blades 36A and 36B disposed obliquely inward at the lower portion of the head main body 14 The space 38 is reached.

  Note that whether the solder paste in the paste pack is filled in the printing space 38 and printing can be started can be determined based on the movement width of the pressure piston 32. Specifically, the screen printing apparatus is provided with detecting means for detecting the position of the pressure piston as an upper limit position, an intermediate position (printable start position) and a lower limit position (paste empty position). When the cylinder 16 is pressurized and lowered, printing is started when it is detected that it is between the intermediate position and the lower limit position. When it is detected that the pressurizing piston 32 is present at the upper limit position, between the upper limit position and the intermediate position, and at the lower limit position, it is determined that cream solder is not filled in the print space or cream solder is empty. , Do not start printing. By providing such a detection means, it is possible to determine whether printing is possible.

  Further, when the pressurizing piston 32 moves downward, since the end of the pressurizing piston 32 is inclined as if chamfered, the central portion of the paste pack shown in FIG. The concave portion 31b is inverted. When the pressurizing piston 32 further moves downward, as shown in FIG. 9C, the concave portion 31b of the paste pack is completely inverted, and the outer shape of the lower end thereof is shaped along the inner wall of the printing space 38. The paste pack is brought into close contact with the inner surface of the printing space 38 by the pressurizing piston 32. Therefore, when the pressurizing piston 32 moves to the lowermost end, the lower end of the printing space 38 and the piston are almost in contact with each other, and there is almost no gap between them. Therefore, as will be described later, the cream solder in the paste pack can be discharged from the discharge opening 37 with little waste.

  FIG. 10 is a process diagram showing a process of discharging cream solder in a modification of the screen printing apparatus according to the embodiment of FIG. The screen printing apparatus according to the modification differs from the screen printing apparatus shown in FIG. 1 only in the configuration of the squeegee head 13a and the pressure piston 52, and the other configurations are almost the same. explain.

  The squeegee head shown in FIG. 10 differs in that a paste modifying stirring member 59 is provided in the printing space of the head main body 54. The stirring member 59 is a rod-shaped member having a diamond-shaped cross section that extends along the extending direction of the discharge opening above the discharge opening 57. By providing the stirring member, the cream solder pushed out from the paste pack 31 moves in the printing space 58 while being in contact with the stirring member, and at this time, the viscosity is lowered and the viscosity is modified to be suitable for printing. Is done.

  In addition, when the pressure piston 52 is lowered until it is inserted into the printing space 58 as compared with the pressure piston 32 used in the screen printing apparatus of FIG. It differs in that it has a notch 52b. Therefore, the lower surface 52a of the pressurizing piston 52 is configured in substantially the same shape as the lower surface of the head main body portion 54 except for the notch 52b. In FIG. 10, the width dimension of the notch 52b may be appropriately determined according to the width dimension of the stirring member 59, and may be narrower or wider than the discharge opening 57 of the squeegee head 13a. In other words, an appropriate material may be used depending on the properties of the cream solder used for printing.

  In the screen printing apparatus according to the modification shown in FIG. 10, when the pressurizing piston 52 is moved downward for discharging the cream solder, the container wall constituting the concave portion 31b of the paste pack 31 is shown in FIG. As shown in (c), while contacting the agitating member 59, it is pushed down by the lower end on both sides of the notch of the pressure piston, and is expanded and deformed so as to be inserted into the notch 52b of the pressure piston 52.

  When the pressurizing piston 52 moves to the lowest end, as shown in FIG. 10 (d), the stirring member 59 is accommodated in the notch 52b of the pressurizing piston 52, and the concave portion of the paste pack is interposed between the two. It arrange | positions so that a film | membrane may be pinched | interposed.

  Next, the printing process of the screen printing apparatus according to the present embodiment will be described. As shown in FIG. 11A, at the start of printing, the squeegee head 13 stands by above the end of the mask plate 12 on the upstream side in the squeegeeing direction (hereinafter abbreviated as the upstream end). ing. Further, the substrate 7 is carried into the lower side of the mask plate 12, aligned in the horizontal direction, and then pressed against the mask plate 12. After the substrate 7 is set, the head lifting / lowering unit 20 as a pressing device is operated until the lower ends of the blade portions 36A and 36B press the surface of the mask plate 12 as shown by arrows in FIG. Descent.

  As shown in FIG. 11C, when the squeegee head is lowered and the lower ends 36a of the blade portions 36A and 36B come into contact with the mask plate with a predetermined pressure, the squeegee head is stopped from descending. Next, the pressurizing piston 32 is lowered to bring the cream solder 50 in the squeegee head 13 into a pressurized state.

  Next, as shown in FIG. 11D, the cream solder 50 is moved to the mask plate 12 by driving the motor 28 and moving the squeegee head 13 from the upstream end in the direction of the arrow 80 on the mask plate 12. The pattern hole 12a is entered, and the inside is satisfactorily filled.

  When the squeegee head 13 reaches the end of the mask plate on the downstream side in the squeegeeing direction (hereinafter abbreviated as the downstream end), the cream solder 50 is placed in any of the pattern holes 12a of the mask plate existing on the upstream side. Is completed, and the pattern is printed on the substrate 7. When the printing is finished, the pressurization to the cream solder in the printing space 38 is stopped. After that, as shown in FIG. 11E, the squeegee head is raised in the direction of the arrow by the head elevating unit 20 to release the contact with the mask plate surface.

  As described above, according to the screen printing apparatus according to the present embodiment, the paste in one paste pack can be used without remaining in the squeegee head, so that the waste of cream solder can be reduced. In addition, in the case of switching the type of cream solder, etc., it is possible to discharge cream solder and execute printing with only one paste pack, so printing starts without replacing the paste pack as in the past. be able to. In addition, since there is little cream solder remaining in the printing space, the amount of cream solder that is discarded without being used can be greatly reduced.

1 is a front view of a screen printing apparatus according to an embodiment of the present invention. It is a partial side view of the screen printing apparatus of FIG. It is a partial cross section schematic diagram of the squeegee head of the screen printing apparatus of FIG. It is a disassembled block diagram of the squeegee head of FIG. It is a figure which shows the state which the squeegee head of FIG. 3 closed. It is a figure which shows the state which the squeegee head of FIG. 3 opened. It is a perspective view which shows the structure of the squeegee head of FIG. 3 in the state which decomposed | disassembled the main-body part of a head, and the pack accommodating part. It is a perspective view which shows the external appearance structure of the paste pack used for the screen printing apparatus of FIG. It is II sectional drawing of FIG. 6A. FIG. 4 is a perspective view showing a state in which a paste pack is mounted on the squeegee head of FIG. 3. It is process drawing explaining the process of mounting | wearing a paste pack with the squeegee head of FIG. FIG. 4 is a process diagram illustrating a process of discharging cream solder in the squeegee head of FIG. 3. It is process drawing which showed the process of discharging the cream solder at the time of using the squeegee head concerning the modification of the screen printing apparatus of FIG. It is a partial process figure which shows a motion of the squeegee head at the time of printing. It is process drawing of the process of filling cream solder in the squeegee head at the time of printing. It is process drawing of the process of filling cream solder in the squeegee head at the time of printing. It is process drawing of the process of filling cream solder in the squeegee head at the time of printing. It is process drawing of the process of filling cream solder in the squeegee head at the time of printing. It is process drawing of the process of filling cream solder in the squeegee head at the time of printing. It is process drawing of the process of filling cream solder in the squeegee head at the time of printing. It is process drawing of the process of filling cream solder in the squeegee head at the time of printing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Positioning part 2 X-axis table 3 Y-axis table 4 θ-axis table 5 Z-axis table 6 Bottom receiving part 7 Substrate 8 Clamp part 10 Screen mask 11 Holder 12 Mask plate 12a Pattern hole 13, 13a Squeegee head 14 Head body part 16 Cylinder 20 Head Lifting Unit 21 Base Member 22 Cylinder 23 Slider 24 Guide Rail 25 Frame 26 Nut Member 27 Feed Screw 28 Motor 30 Pack Storage Unit 31 Paste Pack 32 Pressing Piston 33 Extrusion Plates 36A and 36B Blade Unit 37 Discharge Opening 38 Printing Space 50 Cream solder 100 Screen printing device

Claims (5)

An exchangeable paste pack in which a paste is stored inside a flexible film-like container having one opening can be accommodated so that the opening faces downward, and the paste is discharged from a discharge opening provided at the bottom. A squeegee head that discharges the pressure, and a pressure device that pressurizes the paste by moving the piston with a piston that presses down the upper surface of the accommodated paste pack, wherein the paste is pressurized A screen printing apparatus that prints a paste on a printing material through a pattern hole of the mask plate by pressing and moving the squeegee head on the mask plate,
The squeegee head is
A cylindrical pack accommodating portion having a delivery opening having a size substantially the same as the opening of the paste pack below, accommodating the paste pack, and capable of arranging the piston above the accommodated paste pack;
A cylindrical head that is connected to the lower part of the pack housing part, has an opening of the same size as the delivery opening of the pack housing part and an ejection opening in the lower part, and has a printing space formed inside. The main body,
A paste pack fixing part that detachably fixes the paste pack so that the opening of the paste pack is positioned at the opening for delivery of the pack housing part,
The screen printing apparatus, wherein the piston is movable to the printing space through the delivery opening and has an outer shape configured along the inner wall of the head main body. .   The paste pack fixing portion includes a lower surface of the paste reservoir and a top surface of the head main body portion that sandwich a flange portion positioned around the opening of the paste pack between the pack housing portion and the head main body portion. The screen printing apparatus according to claim 1, wherein the screen printing apparatus is provided.   The head body portion is pivotally supported by the pack housing portion so as to be detachable and connected to the pack housing portion so as to be openable and closable, and the head main body portion is closed to sandwich the flange portion with the pack housing portion. The screen printing apparatus according to claim 2, further comprising a head fixing portion that fixes the main body portion.   4. The screen printing apparatus according to claim 2, wherein the flange portion of the paste pack is configured to have the same size as the peripheral wall thickness of the pack housing portion. 5. The head main body includes a bar-like stirring member extending along the extending direction of the discharge opening above the discharge opening, and the piston has a notch for preventing interference with the stirring member. The screen printing apparatus according to any one of claims 1 to 4, wherein the screen printing apparatus is characterized in that:

Images