JP5887488B2 - Paste supply device and screen printing device - Google Patents

Description

  The present invention relates to a paste supply device that supplies a paste stored in a cylindrical container, and a screen printing apparatus including the paste supply device.

  In a component mounting field in which an electronic component is mounted on a substrate to manufacture a mounting substrate, screen printing is used as a method for supplying an electronic component bonding paste to an electrode of the substrate. In screen printing, the paste supplied on the screen mask is scraped by a squeegee and printed on the bonding electrodes of the substrates through the pattern holes. In the process of repeatedly executing this printing operation, solder replenishment work for replenishing the consumed paste is appropriately performed. Since the paste is supplied in a state where it is stored in a cylindrical container whose upper surface side can be opened, a paste supply device is used in this solder replenishment operation to discharge the paste in the cylindrical container directly onto the screen mask. (See, for example, Patent Document 1).

  In this patent document example, a piston that is movable along the inner surface is inserted into a cylindrical container in which paste is accommodated and pushed in, whereby the internal paste is discharged through a discharge hole provided through the piston. I am doing so. As a sealing mechanism that is attached to the piston to prevent the leakage of paste, first, an O-ring is attached to a plurality of annular grooves for attaching a seal member formed on the side surface of the piston, and further to the outer peripheral surface of the O-ring in the annular groove A configuration in which a plurality of seal rings are overlapped and fitted is adopted. Thereby, even when there is an error in the inner diameter dimension of the cylindrical container, it can be used and has excellent versatility.

JP 2010-172928 A

  However, the prior art shown in the above patent document examples has the following disadvantages. That is, in the configuration using a plurality of sets of seal rings as the seal mechanism, the problem that the paste remains in the gap between the seal rings is unavoidable. If it is continuously used in such a state, the remaining deteriorated solder is mixed in a new paste, which causes a bonding failure. In order to prevent such problems, maintenance work is required to remove and clean the remaining paste, but the workability is poor due to the complicated structure of the seal mechanism, and the maintenance work is complicated. Needed. This difficulty in workability is the same when the piston is inserted into the cylindrical container, and labor and time are required for each container replacement operation.

  Therefore, the present invention has an object to provide a paste supply device that ensures versatility for various types of cylindrical containers and has excellent workability during maintenance and container replacement operations, and a screen printing apparatus including the paste supply device. To do.

The paste supply device according to the present invention has a discharge hole provided through the discharge tool by inserting the discharge tool from an opening provided on one side of the cylindrical container. A paste supply device that supplies and discharges via a piston portion that is provided in the insertion direction side of the discharge tool and that slides in engagement with the inner peripheral surface of the cylindrical container; and provided in the piston portion A seal mechanism that seals a sliding surface with the inner peripheral surface; and a drive mechanism that relatively moves the cylindrical container and the discharge tool in a fitting direction, and the seal mechanism includes an outer periphery of the piston portion. lip annular mounted on the side radially projecting on the sliding surface side has a plurality of rows formed annular band-shaped seal member, the formation of the lip portion of said plurality of rows in the outer peripheral side of the piston portion The set annular width range so as to include the position corresponding to the location, the predetermined mounting gap separating the inner mounting surface of the inner peripheral side of the seal member from the outer mounting surface of the outer peripheral side of the piston portion is formed ing.

The screen printing apparatus of the present invention is a screen printing apparatus for printing a paste on the substrate by bringing the substrate into contact with the lower surface of the mask plate in which pattern holes are formed, and holding the substrate against the mask plate. A substrate positioning unit that positions and holds the screen, and a screen printing mechanism that prints the paste on the substrate through the pattern holes by sliding a squeegee in contact with the upper surface of the mask plate to which the paste is supplied. By inserting a discharge tool from an opening provided on one side of the cylindrical container, the paste stored in the cylindrical container is discharged through a discharge hole provided through the discharge tool, A paste supply device for supplying to the mask plate, the paste supply device on the insertion direction side in the discharge tool A piston portion that fits and slides on the inner peripheral surface of the cylindrical container, a seal mechanism that is provided on the piston portion and seals the sliding surface with the inner peripheral surface, the cylindrical container and the discharge tool And a drive mechanism that relatively moves in the fitting direction, and the sealing mechanism is formed in a plurality of rows of annular lip portions that are mounted on the outer peripheral side of the piston portion and project radially in the sliding surface side An annular band-shaped seal member, and an annular width range set to include positions corresponding to the formation positions of the plurality of rows of lip portions on the outer peripheral side of the piston portion, A predetermined mounting gap that separates the inner mounting surface on the inner peripheral side from the outer mounting surface on the outer peripheral side of the piston portion is formed.

According to the present invention, in the paste supply apparatus configured to discharge the paste stored in the cylindrical container through the discharge hole provided through the discharge tool, the paste is fitted to the inner peripheral surface of the cylindrical container and slid. A seal mechanism that is provided on the moving piston portion and seals the sliding surface with the inner peripheral surface is mounted on the outer peripheral side of the piston portion, and a plurality of annular lip portions that project radially on the sliding surface side are formed. It has an annular belt- like seal member, and is mounted on the inner peripheral side of the seal member within an annular width range that is set to include positions corresponding to the formation positions of a plurality of rows of lip portions on the outer peripheral side of the piston portion. By adopting a configuration in which a predetermined mounting gap is formed that separates the surface from the outer mounting surface on the outer peripheral side of the piston portion, bending of the seal member is allowed and the variation in the diameter of the cylindrical container can be easily followed. For various types of cylindrical containers While securing versatility, it is possible to improve the workability of maintenance and vessel replacement.

The side view of the screen printing apparatus equipped with the paste supply apparatus of one embodiment of this invention The front view of the screen printing apparatus equipped with the paste supply apparatus of one embodiment of this invention The top view of the screen printing apparatus equipped with the paste supply apparatus of one embodiment of this invention Operation | movement explanatory drawing of the screen printing apparatus equipped with the paste supply apparatus of one embodiment of this invention Structure explanatory drawing of the paste supply apparatus of one embodiment of this invention The fragmentary sectional view of the paste supply device of one embodiment of the present invention Structure explanatory drawing of the sealing mechanism used for the paste supply apparatus of one embodiment of this invention Structure explanatory drawing of the sealing mechanism used for the paste supply apparatus of one embodiment of this invention

  Next, embodiments of the present invention will be described with reference to the drawings. First, the structure of the screen printing apparatus will be described with reference to FIG. 1, FIG. 2, and FIG. In FIG. 1, the screen printing apparatus is configured by arranging a screen printing mechanism 11 above a substrate positioning unit 1. The substrate positioning unit 1 is configured by stacking a Y-axis table 2, an X-axis table 3, and a θ-axis table 4, and further combining a first Z-axis table 5 and a second Z-axis table 6 thereon. Yes.

  The configuration of the first Z-axis table 5 will be described. Similarly, on the upper surface side of the horizontal base plate 4 a provided on the upper surface of the θ-axis table 4, the horizontal base plate 5 a is held up and down by an elevating guide mechanism (not shown). The base plate 5a is moved up and down by a Z-axis lifting mechanism configured to rotationally drive a plurality of feed screws 5c through a belt 5d by a motor 5b.

  A vertical frame 5e is erected on the base plate 5a, and a substrate transport mechanism 8 is held at the upper end of the vertical frame 5e. The substrate transport mechanism 8 includes two transport rails arranged in parallel to the substrate transport direction (X direction—the direction perpendicular to the paper surface in FIG. 1), and both end portions of the substrate 10 to be printed by these transport rails. It supports and conveys. By driving the first Z-axis table 5, the substrate 10 held by the substrate transport mechanism 8 can be lifted and lowered with respect to the screen printing mechanism 11 together with the substrate transport mechanism 8. As shown in FIGS. 2 and 3, the substrate transport mechanism 8 extends to the upstream side (left side in FIGS. 2 and 3) and the downstream side, and the substrate 10 carried from the upstream side is transported by the substrate transport mechanism 8. Further, the substrate is positioned by the substrate positioning unit 1. Then, the substrate 10 after printing by the screen printing mechanism 11 is carried out to the downstream side by the substrate transport mechanism 8.

  The configuration of the second Z-axis table 6 will be described. A horizontal base plate 6a is disposed between the substrate transport mechanism 8 and the base plate 5a so as to be movable up and down along a lifting guide mechanism (not shown). The base plate 6a is moved up and down by a Z-axis lifting mechanism configured to rotationally drive a plurality of feed screws 6c through a belt 6d by a motor 6b. On the upper surface of the base plate 6a, there is disposed a substrate lower receiving portion 7 having a lower receiving surface for holding the substrate 10 on the upper surface.

  By driving the second Z-axis table 6, the substrate receiving unit 7 moves up and down with respect to the substrate 10 held by the substrate transport mechanism 8. The substrate receiving portion 7 supports the substrate 10 from the lower surface side when the lower receiving surface of the substrate lower receiving portion 7 contacts the lower surface of the substrate 10. A clamp mechanism 9 is disposed on the upper surface of the substrate transport mechanism 8. The clamp mechanism 9 includes two clamp members 9a that are arranged opposite to each other on the left and right sides, and the substrate 10 is clamped and fixed from both sides by moving the clamp member 9a on one side forward and backward by the drive mechanism 9b.

  Next, the screen printing mechanism 11 disposed above the substrate positioning unit 1 will be described. 1 and 2, a screen mask 12 is extended on the mask frame 12a. The screen mask 12 corresponds to the shape and position of the electrode 10a to be printed on the substrate 10 (see FIG. 3). Pattern holes 12b are provided. A squeegee unit 13 is disposed on the screen mask 12.

  The squeegee unit 13 has a structure in which a squeegee raising / lowering mechanism 15 for raising and lowering a squeegee 16 held by a squeegee holder 17 is disposed on a horizontal moving plate 14. By driving the squeegee lifting mechanism 15, the squeegee 16 moves up and down together with the squeegee holder 17 and comes into contact with the upper surface of the screen mask 12. A paste supply unit 18 (paste supply device) for supplying cream solder 19 (see FIGS. 4 and 6) as a paste is coupled to the moving plate 14, and the paste supply unit 18 moves integrally with the squeegee unit 13. To do.

  As shown in FIG. 2, a guide rail 21 is disposed on the vertical frame 20 in the Y direction, and the slider 22 slidably fitted to the guide rail 21 is connected to the movable plate 14 via the coupling member 23. Connected to both ends. Thereby, the squeegee unit 13 is slidable in the Y direction. The moving plate 14 is horizontally moved in the Y direction by a squeegee moving means comprising a nut 25, a feed screw 24, and a squeegee moving motor (not shown) that rotationally drives the feed screw 24.

  Next, a printing operation by the screen printing mechanism 11 will be described with reference to FIG. First, when the substrate 10 is carried into the printing position by the substrate transport mechanism 8, the second Z-axis table 6 is driven to raise the substrate receiving portion 7 (arrow a), as shown in FIG. The lower surface of the substrate 10 is received and the substrate 10 is sandwiched and clamped by the clamp member 9a. In this state, the substrate positioning unit 1 is driven to align the substrate 10 with the screen mask 12.

  Thereafter, as shown in FIG. 4B, the first Z-axis table 5 is driven to raise the substrate 10 together with the substrate transport mechanism 8 (arrow b), and is brought into contact with the lower surface of the screen mask 12. Thereby, the substrate 10 is positioned and fixed with respect to the screen mask 12 in the squeegeeing by the squeegee unit 13. In this state, the squeegee 16 is slid on the screen mask 12 to which the cream solder 19 as a paste is supplied (arrow c), whereby the cream solder 19 is printed on the substrate 10 through the pattern holes 12b. .

  Next, the configuration of the paste supply unit 18 will be described with reference to FIG. A substantially U-shaped frame member 30 constituting the paste supply unit 18 is coupled to the end of the moving plate 14 on the Y direction side (see also FIG. 1). A vertical guide rail 31 is disposed inside the vertical member 30b coupled to the moving plate 14 in the frame member 30, and a slider 32 having an L-shaped bracket 33 fixed to the guide rail 31 is provided. It is slidable in the vertical direction.

  On the lower surface side of the upper member 30 a of the frame member 30, a drive mechanism 34 for linearly driving such as a cylinder is disposed with the lifting shaft 34 a facing downward, and the lower end portion of the lifting shaft 34 a is the horizontal plate of the bracket 33. 33a. Further, a cylindrical container 35 for storing cream solder 19 is mounted on the lower surface of the horizontal plate 33a. In this mounted state, the discharge tool 36 is fitted into the cylindrical container 35 from the opening 35c provided below, and the discharge shaft portion 36a of the discharge tool 36 is engaged with the lower member 30c by the locking portion 36c. It protrudes below the lower member 30c in a stopped state.

  By driving the drive mechanism 34 and lowering the elevating shaft 34a (arrow d), the cylindrical container 35 is lowered via the horizontal plate 33a, and the cylindrical container 35 moves relative to the discharge tool 36 in the fitting direction. . As a result, the cream solder 19 accommodated in the cylindrical container 35 is pressurized and discharged downward through the discharge hole 36b provided through the discharge shaft portion 36a of the discharge tool 36, and onto the screen mask 12. Supplied. That is, the paste supply unit 18 fits the cream solder 19, which is a paste stored in the cylindrical container 35, by fitting the discharge tool 36 through the opening 35 c provided on one side of the cylindrical container 35. This is a paste supply device that discharges and supplies the liquid through a discharge hole 36b provided therethrough.

  Next, the structure of the cylindrical container 35 and the discharge tool 36 will be described with reference to FIG. The cylindrical container 35 is used to store the cream solder 19 delivered from the manufacturer, and stores the cream solder 19 in a bottomed cylindrical portion made up of a bottom portion 35a and a cylindrical portion 35b. In the screen printing apparatus, when the cream solder 19 is supplied to the upper surface of the screen mask 12 by the paste supply unit 18, the discharge tool 36 is first fitted through the opening 35 c of the cylindrical container 35.

  At the end of the discharge tool 36 on the fitting direction side (arrow e direction), a piston portion 37 that fits and slides on the inner peripheral surface 35d of the cylindrical container 35 is provided. A conical funnel-shaped concave portion 37a opened to the bottom 35a side in the piston portion 37 communicates with a discharge hole 36b provided through the discharge shaft portion 36a. By driving the drive mechanism 34 and lowering the cylindrical container 35, the discharge tool 36 moves relative to the cylindrical container 35 in the fitting direction side (arrow e direction).

  Thereby, the cream solder 19 in the cylindrical container 35 is pressurized by the piston part 37 and discharged downward (arrow f) through the recessed part 37a and the discharge hole 36b. In the discharge of the cream solder 19, the leakage of the cream solder 19 from the inner peripheral surface 35 d and the sliding surface of the piston portion 37 is caused by a sealing mechanism having an annular belt-like seal member 38 mounted on the outer peripheral side of the piston portion 37. Sealed by S. The seal member 38 is manufactured by molding an elastomer material such as resin or rubber rich in elasticity and flexibility into a shape described below.

  A detailed configuration of the seal mechanism S will be described with reference to FIG. As shown in FIG. 7A, in the seal member 38, the upper and lower end portions of the annular band portion 38a are fitted into the notch portions 37c formed in the upper and lower end portions of the concave portion 37a on the outer peripheral side of the piston portion 37. A fitting portion 38c having a matching shape is provided so as to protrude in the inner peripheral direction. The protrusion allowance d2 of the fitting portion 38c is set to be larger than the notch allowance d1 of the notch 37c. Further, the seal member 38 is formed with a plurality of rows (here, two rows) of annular lip portions 38d projecting in the radial direction on the sliding surface side with the inner peripheral surface 35d.

  Here, the thickness dimension of the annular band portion 38a is t, and the width dimension of the outer mounting surface 37b on the outer periphery of the piston portion 37 and the inner mounting surface 38b on the inner peripheral side of the seal member 38 is set to B. The lip portion 38d has a width dimension b and a protruding height h, and is formed in the range of the width dimension B. Note that the thickness dimension t, the width dimension B, the width dimension b, and the protruding height h depend on the pressure of the cream solder 19 in the cylindrical container 35, physical properties such as the elastic coefficient of the material used for the seal member 38, and the like. Therefore, it is set as appropriate based on experience and trial results.

  FIG. 7B shows a state in which the seal member 38 is mounted on the outer periphery of the piston portion 37. In this mounted state, the sealing member 38 is fixed to the piston portion 37 by fitting the fitting portion 38c into the notch portion 37c. Here, since the projection allowance d2 of the fitting portion 38c is larger than the notch allowance d1 of the notch portion 37c, a predetermined attachment gap 39 is formed between the inner attachment surface 38b and the outer attachment surface 37b. The In this state, the outer diameter D1 of the tip surface of the lip portion 38d is a predetermined dimension with respect to the inner diameter D2 of the inner peripheral surface 35d so that the seal member 38 is fitted to the inner peripheral surface 35d with a pre-selected tightening allowance. It is set to be large.

  FIG. 7C shows a state in which the seal mechanism S is configured by fitting the piston portion 37 to which the seal member 38 is mounted in this manner to the inner peripheral surface 35d. In this state, the outer diameter D1 of the tip surface of the lip portion 38d is set larger than the inner diameter D2 of the inner peripheral surface 35d by a predetermined dimension, so that the lip portion 38d is previously pressed against the inner peripheral surface 35d. It is pushed inward by the set allowance. Then, the annular band portion 38a is bent and deformed by this pushing, and the lip portion 38d is pressed against the inner peripheral surface 35d by the pressing force F corresponding to the bending deformation, and the sliding between the piston portion 37 and the inner peripheral surface 35d is performed. The moving surface is sealed. Thereby, the leak from the sliding surface of the cream solder 19 pressurized in the cylindrical container 35 is prevented.

  In other words, the seal mechanism S shown in the above-described configuration has a plurality of rows of annular lip portions 38d that are mounted on the outer peripheral side of the piston portion 37 and project radially in the sliding surface side between the piston portion 37 and the inner peripheral surface 35d. The seal member 38 has an annular belt shape. On the outer peripheral side of the piston portion 37, a predetermined annular width range (corresponding to the width dimension B) set corresponding to the formation range of the plurality of rows of lip portions 38d is within the inner peripheral side of the seal member 38. A predetermined mounting gap 39 that separates the mounting surface 38 b from the outer mounting surface 37 b on the outer peripheral side of the piston portion 37 is formed.

  By adopting the sealing mechanism S having such a configuration, even if there is some variation in the diameter of the inner peripheral surface 35d of the cylindrical container 35 depending on the manufacturer or manufacturing lot, the mounting gap 39 Variations are absorbed by allowing deformation of the seal member 38. As a result, the same discharge tool 36 can be used in common for many types of cylindrical containers having variations in diameter, and the versatility of the discharge tool 36 can be ensured. Further, when the discharge tool 36 is fitted into the cylindrical container 35 through the opening 35c in the replacement operation of the cylindrical container 35, the deformation of the seal member 38 is similarly permitted by the mounting gap 39. Can easily fit the discharge tool 36 into the cylindrical container 35, and is excellent in workability during maintenance and container replacement work.

  Note that the configuration of the seal mechanism S, that is, the outer peripheral shape of the piston portion 37 and the shape of the seal member 38 are not limited to the shape example shown in FIG. 7, and various variations are possible as illustrated in FIG. . That is, as shown in FIG. 8A, a combination of the piston portion 37A and the seal member 38A, and a combination of the piston portion 37B and the seal member 38B shown in FIG. May be formed, and the lip portion 38d may be protruded in a range corresponding to the mounting gap 39.

  The paste supply apparatus and the screen printing apparatus of the present invention are characterized by ensuring versatility for various types of cylindrical containers and excellent workability during maintenance and container replacement work, such as cream solder or conductive paste on the substrate It is useful in the field of screen printing for printing pastes of

DESCRIPTION OF SYMBOLS 1 Board | substrate positioning part 10 Board | substrate 11 Screen printing mechanism 12 Screen mask 12a Mask frame 12b Pattern hole 13 Squeegee unit 16 Squeegee 18 Paste supply part 19 Cream solder 34 Drive mechanism 35 Cylindrical container 35c Opening part 36 Discharge tool 36a Discharge shaft part 37 Piston part 37b Outer mounting surface 38 Seal member 38a Annular belt portion 38b Inner mounting surface 38d Lip portion 39 Mounting gap

Claims (2)

By inserting a discharge tool through an opening provided on one side of the cylindrical container, the paste stored in the cylindrical container is discharged and supplied through a discharge hole provided through the discharge tool. A paste supply device,
A piston portion provided on the insertion direction side in the discharge tool and fitted and slid on the inner peripheral surface of the cylindrical container; and a seal mechanism provided on the piston portion and sealing a sliding surface with the inner peripheral surface; A drive mechanism for relatively moving the cylindrical container and the discharge tool in the fitting direction,
The seal mechanism includes an annular belt-shaped seal member in which a plurality of annular lip portions that are attached to the outer peripheral side of the piston portion and project radially in the sliding surface side are formed,
In the annular width range set to include positions corresponding to the formation positions of the plurality of rows of lip portions on the outer peripheral side of the piston portion, the inner mounting surface on the inner peripheral side of the seal member is connected to the piston portion. A paste supply apparatus, wherein a predetermined mounting gap is formed that is separated from an outer mounting surface on the outer peripheral side. A screen printing apparatus for printing a paste on the substrate by bringing the substrate into contact with the lower surface of the mask plate in which pattern holes are formed,
A substrate positioning unit for holding the substrate and positioning and holding the substrate relative to the mask plate;
A screen printing mechanism for printing the paste on the substrate through the pattern holes by bringing a squeegee into contact with and sliding on the upper surface of the mask plate to which the paste is supplied;
By inserting a discharge tool from an opening provided on one side of the cylindrical container, the paste stored in the cylindrical container is discharged through a discharge hole provided through the discharge tool, and A paste supply device for supplying the mask plate,
The paste supply device includes a piston portion provided on the insertion direction side of the discharge tool and slidingly engaged with the inner peripheral surface of the cylindrical container, and a sliding surface provided between the piston portion and the inner peripheral surface. A seal mechanism that seals, and a drive mechanism that relatively moves the cylindrical container and the discharge tool in the fitting direction,
The seal mechanism includes an annular belt-shaped seal member in which a plurality of annular lip portions that are attached to the outer peripheral side of the piston portion and project radially in the sliding surface side are formed,
In the annular width range set to include positions corresponding to the formation positions of the plurality of rows of lip portions on the outer peripheral side of the piston portion, the inner mounting surface on the inner peripheral side of the seal member is connected to the piston portion. A screen printing apparatus, wherein a predetermined mounting gap is formed that is separated from an outer mounting surface on the outer peripheral side.

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