JP5471860B2 - Screen printing machine - Google Patents

Description

The present invention relates to a screen printing machine for transferring the paste to the substrate through a mask.

  The screen printing machine, after bringing the mask into contact with the substrate, moves the squeegee that is in contact with the mask from above in the horizontal plane direction, so that the paste supplied on the mask is scraped by the paste scraping surface of the squeegee. The paste is transferred to the substrate. In such a screen printing machine, when the squeegee after transferring the paste to the substrate is lifted from the mask, the paste adhering to the squeegee's paste scraping surface may fall to the mask side and entrain air. For this reason, conventionally, a pair of swivel members provided on both ends of the squeegee are pivoted in a vertical manner on a pair of wall-like members, and the wires are horizontally routed. 2. Description of the Related Art A screen printing machine equipped with a cleaning device is known in which a wire is moved relative to a scraping surface of a squeegee to remove the paste adhering to the scraping surface of the squeegee from the squeegee. (For example, Patent Document 1).

JP 2006-281786 A

  However, in the screen printing machine equipped with the cleaning device, the wire moves on an arc-shaped track centering on the pivot axis of the pair of pivot members, so that the range of paste removal by the wire can be applied to the entire scraping surface of the squeegee. It is difficult to set, and there is a problem that the paste cannot be sufficiently removed from the squeegee.

Therefore, an object of the present invention is to provide a screen printing machine that can sufficiently remove the paste from the squeegee.

The screen printing machine according to claim 1, wherein the screen printing machine is supplied onto the mask by moving in a horizontal plane in a state of being in contact with the mask in contact with the substrate and the mask in contact with the substrate from above. A squeegee that scrapes the paste on the paste scraping surface to transfer the paste to the substrate, a squeegee facing member that extends in a horizontal direction at a position facing the paste scraping surface of the squeegee, and a paste for the substrate After the transfer is completed, the squeegee rises with respect to the mask, so that the squeegee-facing member is lowered relative to the paste scraping surface in a state where the squeegee facing member is in contact with or close to the paste scraping surface of the squeegee. and a guide mechanism for guiding the squeegee facing member to motion, the guide mechanism includes a pair of walls provided at both ends of the squeegee A pair of holding members that hold both ends of the member, the squeegee-facing member, and the pair of wall-like members formed along the paste scraping surface of the squeegee to support the pair of holding members movably The squeegee that has finished transferring the paste to the substrate rises with respect to the mask, so that the squeegee-facing member comes into contact with or close to the paste scraping surface of the squeegee. A pair of guide grooves that guide the pair of holding members so as to move downward relative to each other, and the holding members move in the guide grooves as the squeegee rises with respect to the mask. The squeegee-facing member is moved downward relative to the shaped member to move the squeegee-facing member toward the lower end side of each guide groove. By contacting the outer peripheral edge to said mask in contact with the click, with a disc portion to be positioned above the lower end portion of the squeegee opposite member each guide groove.

The screen printing machine according to claim 2 is the screen printing machine according to claim 1 , wherein the pair of wall-shaped members transfer the paste to the substrate by the squeegee, and the paste of the squeegee It consists of a paste leakage prevention member that prevents the paste from leaking out from both ends of the scraping surface.

In the present invention, after the transfer of the paste to the substrate is completed, the squeegee is lifted with respect to the mask, so that the squeegee facing member provided extending in the horizontal direction at a position facing the paste scraping surface of the squeegee is provided. The paste removal range by the squeegee-facing member is extended to the entire paste scraping surface of the squeegee. The paste can be sufficiently removed from the squeegee. Here, each holding member includes a disk portion that positions the squeegee-facing member above the lower end of each guide groove by bringing the outer peripheral edge into contact with the mask while the squeegee is in contact with the mask. By adjusting the radius of the disk portion, the paste removal range can be easily set.

The top view of the screen printer in one embodiment of the present invention The front view of the screen printer in one embodiment of the present invention The side view of the screen printer in one embodiment of the present invention The top view of the mask installed in the mask holder with which the screen printing machine in one embodiment of this invention is equipped, and the mask holder (A) Perspective view of a squeegee included in a screen printer according to an embodiment of the present invention (b) Partially exploded perspective view of a squeegee included in a screen printer according to an embodiment of the present invention (A) Side view of a squeegee included in a screen printer according to an embodiment of the present invention (b) Partial cross-sectional front view of a squeegee included in a screen printer according to an embodiment of the present invention (A) (b) The partial expanded side view of the squeegee with which the screen printer in one embodiment of this invention is provided. The block diagram which shows the control system of the screen printer in one embodiment of this invention The flowchart which shows the execution procedure of the screen printing operation which the screen printer in one embodiment of this invention performs (A) (b) Operation | movement explanatory drawing of the screen printer in one embodiment of this invention (A) (b) (c) Operation explanatory diagram of the screen printer in one embodiment of the present invention (A) (b) Operation | movement explanatory drawing of the screen printer in one embodiment of this invention (A) (b) Operation | movement explanatory drawing of the screen printer in one embodiment of this invention (A) (b) Operation | movement explanatory drawing of the screen printer in one embodiment of this invention (A) (b) The partial expanded side view of the squeegee with which the screen printer in one embodiment of this invention is provided. (A) (b) (c) Operation explanatory diagram of the screen printer in one embodiment of the present invention

  Embodiments of the present invention will be described below with reference to the drawings. A screen printing machine 1 shown in FIGS. 1, 2 and 3 is a kind of electronic component mounting apparatus constituting an electronic component mounting line for mounting substrate production. A substrate 2 is carried in and placed on the surface of the substrate 2. After performing screen printing for transferring a paste Pst (see FIG. 3) such as a solder paste or a conductive paste onto the provided electrode 3, the substrate 2 is transferred to an electronic component mounting machine (not shown) on the downstream side. The operation to carry out is executed continuously. Hereinafter, for convenience of explanation, the transport direction of the substrate 2 in the screen printing machine 1 is the X axis direction (left and right direction in FIG. 1), and the horizontal direction perpendicular to the X axis direction is the Y axis direction (up and down direction in FIG. 1). ) And the vertical direction is the Z-axis direction. The Y-axis direction is the front-rear direction of the screen printing machine 1 and the X-axis direction is the horizontal (left-right) direction of the screen printing machine 1. Further, in the front-rear direction, the operator OP (FIG. 1) of the screen printing machine 1 performs the operation on the screen printing machine 1 (below the paper surface in FIG. 1) is the front side of the screen printing machine 1, and the opposite side (see FIG. 1). 1) is the rear side of the screen printer 1.

  1, 2, and 3, the screen printing machine 1 includes a substrate holding / moving unit 12 provided on a base 11, and an upstream side of the substrate holding / moving unit 12 in the conveyance direction (X-axis direction) of the substrate 2 ( The substrate carry-in conveyor 13 provided on the left side of the paper in FIG. 1 and the substrate carry-out conveyor 14 provided on the downstream side (right side of the paper in FIG. 1) of the substrate holding and moving unit 12 in the transport direction of the substrate 2. A plate-shaped mask 15 made of a metal thin plate material, a pair of front and rear squeegees 16 and a camera unit 17 are provided.

  2 and 3, the substrate holding and moving unit 12 includes a horizontal moving unit 21, an elevating unit 22, a conveyor unit 23, a lower receiving unit 24, and a substrate holding unit 25.

  2 and 3, the horizontal moving unit 21 moves to the Y table 21a that moves in the Y-axis direction with respect to the base 11 by the operation of the Y table drive motor My, and to the Y table 21a by the operation of the X table drive motor Mx. The X table 21b that moves in the X axis direction, the θ table 21c that rotates around the Z axis with respect to the X table 21b, the base table 21d that is fixed to the upper surface of the θ table 21c, and the upper surface of the base table 21d that extends upward It consists of a plurality of lift table guides 21e provided.

  2 and 3, the elevating unit 22 is provided so as to extend upward from the upper surface of the elevating table 22a and the elevating table 22a which are guided by a plurality of elevating table guides 21e of the horizontal moving unit 21 and elevate with respect to the base table 21d. The upper and lower elevating frames 22c are provided on the upper surface of the plurality of lower receiving portion elevating guides 22b and the elevating table 22a.

  In FIG. 3, the conveyor unit 23 is supported by a lifting frame 22c and is supported by a pair of front and rear belt conveyor support members 23a that moves up and down with respect to the base table 21d together with the lifting table 22a, and is supported by each belt conveyor support member 23a. A pair of front and rear belt conveyors 23b that perform a feeding operation to each other, and the front and rear belt conveyors 23b operate synchronously, whereby the substrate 2 is transported in the X-axis direction.

  2 and 3, the lower receiving portion 24 is provided below the conveyor portion 23 on the upper surfaces of the lower receiving unit support table 24a and the lower receiving unit support table 24a which are guided by the lower receiving portion lifting guide 22b. And a receiving unit 24b. The lower receiving unit 24b has a plurality of pin members 24c (FIG. 2) provided so as to extend upward. The lower receiving unit 24b moves up and down with respect to the lifting table 22a integrally with the lower receiving unit support table 24a. The upper end of the member 24c is brought into contact with the lower surface of the substrate 2 supported at both ends by the front and rear belt conveyors 23b from below to support the substrate 2.

  In FIG. 3, the substrate holding part 25 is composed of a pair of front and rear clamp members 25a provided on the upper portions of the front and rear belt conveyor support members 23a so as to be movable in the Y-axis direction (see also FIG. 1). These front and rear clamp members 25a open and close in opposite directions (that is, in the Y-axis direction) via a link mechanism (not shown) by operating a clamp member operating motor 26 (FIG. 3) attached to the lifting frame 22c. The substrate 2 supported at both ends by the front and rear belt conveyors 23b is clamped and held from the width direction (Y-axis direction) with respect to the transport direction, and the holding is also performed. Can be released.

  1 and 2, each of the substrate carry-in conveyor 13 and the substrate carry-out conveyor 14 includes a pair of front and rear belt conveyors 13a and 14a, similar to the conveyor portion 23 of the substrate holding and moving unit 12. The substrate carry-in conveyor 13 carries in the substrate 2 input from the outside of the screen printing machine 1 and delivers it to the conveyor unit 23 of the substrate holding and moving unit 12. The substrate carry-out conveyor 14 is transferred from the conveyor unit 23 of the substrate holding and moving unit 12. The delivered substrate 2 is carried out of the screen printer 1.

  As described above, the substrate carry-in conveyor 13, the conveyor unit 23 of the substrate holding and moving unit 12, and the substrate carry-out conveyor 14 function as a substrate conveyance path 27 (FIG. 1) that conveys the substrate 2.

  In FIG. 1 and FIG. 2, a pair of portal frames 31 are provided on the base 11 so as to straddle the substrate carry-in conveyor 13 and the substrate carry-out conveyor 14 in the Y-axis direction. The holder 32 is supported. The mask holder 32 includes a pair of front and rear guide members 33 that are attached to the portal frame 31 and extend in the X-axis direction above the substrate holding portion 25 provided in the substrate holding and moving unit 12 and a pair of guide members. 33 comprises a pair of left and right mask support rails 34 extending in the Y-axis direction. The mask 15 is held in a horizontal position above the substrate holding and moving unit 12 by being supported at both left and right sides by a pair of left and right mask support rails 34 provided in the mask holder 32 (see also FIG. 4).

  In FIG. 1 and FIG. 4, the mask 15 is supported by a mask frame 15w made of a rectangular frame member in plan view, and a rectangular region surrounded by the mask frame 15w has a plurality of sides on the substrate 2. A large number of pattern holes 15a (FIG. 4) corresponding to the electrodes 3 are provided. That is, the mask 15 has a large number of pattern holes 15 a formed according to the arrangement of the electrodes 3 on the substrate 2.

  In FIG. 1, two sets of substrate-side positioning marks mk are provided at diagonal positions of the substrate 2. On the other hand, in FIG. 4, the mask 15 is provided with a pair of mask side positioning marks MK arranged corresponding to the substrate side positioning marks mk. When the substrate 2 is brought into contact with the mask 15 with the substrate-side positioning mark mk and the mask-side positioning mark MK vertically aligned, the electrode 3 of the substrate 2 and the pattern hole 15a of the mask 15 are aligned. In FIG. 4, a rectangular area Sg indicated by a broken line is an area on the mask 15 that comes into contact with the substrate 2 when the substrate 2 is brought into contact with the mask 15.

  1 and 2, both ends of an X-axis stage 35 extending in the X-axis direction are supported by a pair of portal frames 31 so as to be slidable in the Y-axis direction. A camera support stage 36 is provided on the X-axis stage 35 so as to be movable in the X-axis direction, and the camera unit 17 is attached to the camera support stage 36. The camera unit 17 includes a first camera 17a having an imaging field of view directed downward and a second camera 17b having an imaging field of view directed upward (FIG. 3).

  1 and 2, a pair of portal frames 31 support both ends of a squeegee base 37 extending in the X-axis direction, and the squeegee base 37 can reciprocate in the Y-axis direction along the portal frame 31. It has become.

  2 and 3, two squeegee raising / lowering cylinders 38 are provided with piston rods 38a facing downward at positions opposite to the Y-axis direction at the center of the upper surface of the squeegee base 37. Each piston rod 38a of the cylinder 38 extends through the squeegee base 37 in the vertical direction. The above-described squeegee 16 is attached to the lower end of the piston rod 38a of each squeegee lifting cylinder 38.

  In the enlarged view shown in FIG. 3 and FIGS. 5A and 5B, each squeegee 16 is attached to the lower end of the piston rod 38a and extends in the X-axis direction. Is fixed and extends in the X-axis direction, and has a blade portion 41 extending obliquely downward and extending in the shape of a spatula.

  5A, 5B and 6A, 6B, a pair of wall-like members 42 are attached to both ends of the blade holding portion 40 by a plurality of screws 43. The pair of wall-like members 42 are paste leakage preventing members that prevent the paste Pst from leaking out from both ends of the paste scraping surface 41a of the blade portion 41 when the paste Pst is transferred to the substrate 2 by the squeegee 16. It functions as.

  5A, 5B and 6A, 6B, the pair of wall-like members 42 have a pair of guide grooves 42a formed along the paste scraping surface 41a of the blade portion 41. Is formed to extend in an oblique direction along the blade portion 41 in a plane (in the YZ plane) orthogonal to the direction in which the blade portion 41 extends (X-axis direction). In the pair of guide grooves 42a, a squeegee is provided. A pair of wire holding members 45 that hold both ends of the wire 44 as a squeegee-facing member provided in the horizontal direction at a position facing the 16 paste scraping surface 41a (of the blade portion 41) are movable. Is provided. Each wire holding member 45 has a small-diameter wire coupling portion 45a located in the guide groove 42a and coupled to the end of the wire 44, and the wire coupling portion 45a as a center. And a large-diameter disk portion 45b that is rotatable around the central axis of the coupling portion 45a. Here, the wire 44 whose both ends are coupled to the pair of wire coupling portions 45a is maintained in a state of extending in the horizontal plane without bending.

  When the piston rod 38a of the squeegee lifting cylinder 38 is operated in the vertical direction, the squeegee 16 attached to the lower end of the piston rod 38a moves up and down with respect to the squeegee base 37 (and therefore with respect to the mask 15). Then, one of the front squeegee 16 (the left squeegee 16 in FIG. 3) and the rear squeegee 16 (the left squeegee 16 in FIG. 3) is lowered with respect to the squeegee base 37, and the squeegee 16 is masked. The squeegee 16 can be slid on the mask 15 in the horizontal plane direction by moving the squeegee base 37 in the front-rear direction (Y-axis direction) in a state where the squeegee 15 is in contact with the upper surface of the mask 15.

  Here, the disk portion 45b of each wire holding member 45 is divided in accordance with the length of the radius by bringing the outer peripheral edge into contact with the mask 15 while the blade portion 41 of the squeegee 16 is in contact with the mask 15. Only the wire 44 has a function of being positioned above the lower end of each guide groove 42a. As a result, as will be described later, when the squeegee 16 that has finished transferring the paste Pst to the substrate 2 is raised with respect to the mask 15, the wire coupling portions 45a of the wire holding members 45 have a wall-like shape in the guide groove 42a. The paste Pst adhering to the paste scraping surface 41 a can be removed by the wire 44 so as to descend relative to the member 42.

  Further, in removing the paste Pst by moving the wire 44 relative to the paste scraping surface 41a of the squeegee 16 as described above, when the squeegee 16 is lifted with respect to the mask 15, the wire 44 to the paste scraping surface 41a. Since the paste Pst adhering to the paste scraping surface 41a can be efficiently removed when the amount of movement is larger, the outer peripheral edges of the blade part 41 and the disk part 45b of the squeegee 16 are in contact with the mask 15, It is preferable that the position of the wire 44 is located near the upper end of the paste scraping surface 41a of the squeegee 16.

  For this reason, in the screen printing machine 1 according to the present embodiment, as shown in FIG. 7A, the radius R of the disk portion 45 b of the wire holding member 45 is set to scrape the paste of the squeegee 16 in contact with the mask 15. It is set to be approximately equal to the vertical distance H between the upper end of the surface 41a and the mask 15 (H≈R, where H> R). Further, in order to prevent the wire coupling portions 45a of the pair of wire holding members 45 from coming into contact with the upper end portions of the guide grooves 42a in a state where the blade portion 41 of the squeegee 16 is in contact with the mask 15, the guide grooves 42a The height h from the lower edge of the blade part 41 at the upper end part is slightly larger than the radius R of the disk part 45b (h> R).

  As a result, the squeegee 16 is lowered with respect to the mask 15 by the squeegee lifting cylinder 38, the lower edge of the blade portion 41 abuts on the upper surface of the mask 15, and the outer peripheral edge of the disk portion 45 b of each wire holding member 45 is also on the mask 15. In the state of contact with the upper surface (the state shown in FIG. 7A), the wire coupling portion 45a located at the center of the disk portion 45b is located at the upper end portion of the guide groove 42a, and both ends of the pair of wire coupling portions 45a. The wire 44 in which is held is positioned near the upper end portion of the blade portion 41 on the paste scraping surface 41a side (referred to as a wire raised position state) (FIG. 7A).

  When the squeegee 16 is lifted with respect to the mask 15 by the squeegee lifting cylinder 38 from the state where the wire is raised (arrow A1 shown in FIG. 7B), the pair of wire holding members 45 are guided by the wire coupling portion 45a. Until reaching the lower end of the groove 42a, it is guided by the guide groove 42a and descends relative to the wall-like member 42 (arrow A2 shown in FIG. 7 (b)). Along the paste scraping surface 41a of the portion 41, the paste scraping surface 41a descends while maintaining or in contact with the paste scraping surface 41a of the blade portion 41. When the pair of wire coupling portions 45a reach the lower ends of the pair of guide grooves 42a, the wire 44 is in a state (wire lowered position state) located near the lower end portion of the paste scraping surface 41a of the blade portion 41 (FIG. 7 (b)).

  When the squeegee 16 is further raised by the squeegee lifting cylinder 38 after reaching the wire lowered position state, the pair of wire holding members 45 are lifted together with the squeegee 16 and the disk portions 45b of the pair of wire holding members 45 respectively. The outer peripheral edge of the mask is spaced upward from the upper surface of the mask 15.

  The control device 50 (FIG. 8) does not illustrate the operations of the above-described substrate transport path 27 for transporting the substrate 2 (the operations of the substrate carry-in conveyor 13, the conveyor unit 23 and the substrate carry-out conveyor 14 in the substrate holding and moving unit 12). This is done by controlling the operation of the substrate transport path operating mechanism 51 (FIG. 8) including an actuator or the like. The control device 50 operates the substrate transport path operating mechanism 51 to carry the substrate 2 loaded from the outside of the screen printing machine 1 into the substrate holding and moving unit 12 and the substrate 2 that has finished screen printing. The screen printer 1 is carried out to the outside.

  The opening / closing operation of the front and rear clamp members 25a constituting the substrate holding unit 25 of the substrate holding / moving unit 12 is performed by the control device 50 controlling the operation of the clamp member operating motor 26 (see also FIG. 8). The controller 50 clamps (holds) the substrate 2 carried into the substrate holding / moving unit 12 by operating the clamp member operating motor 26.

  The raising / lowering operation of the lower receiving portion 24 included in the substrate holding / moving unit 12 is performed by controlling the operation of the lower receiving portion raising / lowering mechanism 52 (FIG. 8) including an actuator (not shown) by the control device 50. The control device 50 supports the substrate 2 loaded into the substrate holding / moving unit 12 from below by operating the lower receiving portion lifting mechanism 52.

  Each of the first camera 17a and the second camera 17b constituting the camera unit 17 is controlled by the control device 50 to perform an imaging operation, and the acquired image data is input to the control device 50 (FIG. 8). Further, the movement operation of the camera unit 17 in the horizontal plane, that is, the movement operation of the X-axis stage 35 in the Y-axis direction with respect to the pair of portal frames 31 and the movement of the camera support stage 36 with respect to the X-axis stage 35 in the X-axis direction. Each control of the operation is performed when the control device 50 controls the operation of the camera unit moving mechanism 53 (FIG. 8) including an actuator (not shown). The control device 50 operates the first camera 17a, the second camera 17b, and the camera unit moving mechanism 53, thereby imaging the substrate-side positioning mark mk by the first camera 17a and the mask-side positioning mark by the second camera 17b. MK imaging is performed to detect the positions of the substrate 2 and the mask 15.

  The movement operation of the substrate holding unit 25 in the horizontal plane direction by the substrate holding and moving unit 12 is as follows. The control device 50 moves the Y table 21a in the Y axis direction relative to the base 11, and the X axis of the X table 21b relative to the Y table 21a. The horizontal plane is composed of the actuator including the Y table driving motor My and the X table driving motor Mx described above, which moves in the direction and rotates the θ table 21c around the Z axis with respect to the X table 21b (ie, the base table 21d). This is done by controlling the operation of the inward movement mechanism 54 (FIG. 8). The control device 50 operates the horizontal plane inward movement mechanism 54 based on the respective positions of the substrate 2 and the mask 15 detected by the camera unit 17, so that the horizontal direction in the horizontal plane with respect to the mask 15 of the substrate 2 held by the substrate holding unit 25. Perform positioning.

  The movement operation of the substrate holding unit 25 in the vertical direction by the substrate holding and moving unit 12 is performed by a vertical movement mechanism 55 (see FIG. 5) including an actuator (not shown) or the like that causes the control device 50 to move the lifting table 22a up and down relative to the base table 21d. This is done by performing the operation control of 8). The control device 50 operates the vertical movement mechanism 55 to bring the substrate 2 held by the substrate holding unit 25 and positioned in the horizontal plane with respect to the mask 15 into contact with the lower surface of the mask 15 from below. .

  The raising / lowering operation of each squeegee 16 with respect to the squeegee base 37 is performed by controlling the operation of the two squeegee raising / lowering cylinders 38 (see also FIG. 8) attached to the upper part of the squeegee base 37. The operation control of the squeegee base 37 for reciprocating the front and rear squeegees 16 in the Y-axis direction is performed by the control device 50 controlling a squeegee base moving mechanism 56 (FIG. 8) including an actuator (not shown).

  The control device 50 operates the squeegee lifting cylinder 38 and the squeegee base moving mechanism 56 to move the squeegee base 37 in the front-rear direction (Y-axis direction) with one of the front and rear squeegees 16 in contact with the mask 15. Thus, the paste Pst (see FIG. 3) separately supplied on the mask 15 is scraped by the paste scraping surface 41a of the squeegee 16 (of the blade portion 41), and the substrate 2 is formed via the pattern holes 15a of the mask 15. The paste Pst is transferred to the electrode 3. Here, the control device 50 performs the transfer operation of the paste Pst per sheet of the substrate 2 performed by sliding the front squeegee 16 from the front region to the rear region of the mask 15 and the rear squeegee 16 to the mask 15. The transfer operation of the paste Pst per substrate 2 performed by sliding from the rear region to the front region is performed alternately.

  Next, the execution procedure of the screen printing operation by the screen printer 1 in the present embodiment will be described using the flowchart of FIG. When the control device 50 of the screen printing machine 1 detects that the substrate 2 is input from the upstream side of the screen printing machine 1 to the board carry-in conveyor 13 by a detection unit (not shown), the board carry-in conveyor 13 and the conveyor unit 23 are linked. The substrate 2 is carried into the screen printing machine 1 (arrow B shown in FIG. 10A), and the substrate 2 carried by the conveyor unit 23 is brought to a predetermined conveyance stop position by a detection means (not shown). When the arrival is detected, the operation of the conveyor unit 23 is stopped and the substrate 2 is stopped (FIG. 10B). The substrate carrying-in process of step ST1 shown in FIG.

  When the substrate carrying-in process is completed, the control device 50 closes the front and rear clamping members 25a and clamps (holds) both sides of the substrate 2 on the conveyor unit 23 from the Y-axis direction (FIG. 11A). Arrow C1) shown in the figure. Then, the lower receiving portion 24 is raised from the lowered position with respect to the lift table 22a while the lift table 22a is positioned at the lowered position with respect to the base table 21d (arrow D1 shown in FIG. 11B). Then, the upper end of the lower receiving portion 24 (the upper ends of the plurality of pin members 24c) comes into contact with the lower surface of the substrate 2 whose both ends are supported by the front and rear belt conveyors 23b (FIG. 11B). Then, even after the upper end of the lower receiving portion 24 comes into contact with the lower surface of the substrate 2, the lower receiving portion 24 is raised (arrow D <b> 2 shown in FIG. 11C), and the upper surface of the substrate 2 has the front and rear clamping members 25 a. The substrate 2 is pushed up to the same height as the upper surface of the substrate. As a result, the substrate 2 is lifted while sliding its both ends with respect to the front and rear clamp members 25a, both ends are separated upward from the front and rear belt conveyors 23b, and the substrate 2 is lifted and supported by the lower receiving portion 24. (FIG. 11C) The substrate support process in step ST2 shown in FIG.

  When the above substrate support process is completed, the control device 50 controls the operation of the camera unit moving mechanism 53 (moves the X axis stage 35 in the Y axis direction and moves the camera support stage 36 in the X axis direction). The first camera 17a is positioned immediately above the substrate-side positioning mark mk provided on the substrate 2, and the first camera 17a is imaged of the substrate-side positioning mark mk to detect the position of the substrate 2 ( 12 (a), the substrate position detecting step in step ST3 shown in FIG.9, and then the second camera 17b is positioned directly below the mask side positioning mark MK provided on the mask 15, and the second camera 17b is masked. The position of the mask 15 is detected by imaging the side positioning mark MK (FIG. 12B) (mask position detection step of step ST4 shown in FIG. 9).

  When the mask position detection step is completed, the control device 50 controls the operation of the horizontal moving unit 21 included in the substrate holding and moving unit 12 to move the substrate holding unit 25 (and thus the substrate 2) in the horizontal plane direction, and 15 is positioned in the horizontal plane direction of the substrate 2 (positioning step of step ST5 shown in FIG. 9).

  In this positioning process, the control device 50 is in a state where the substrate-side positioning mark mk detected in the substrate position detecting process in step ST3 and the mask-side positioning mark MK detected in the mask position detecting process in step ST4 are aligned vertically. The substrate 2 is positioned with respect to the mask 15 so that

  When the positioning process is completed, the control device 50 raises the lifting table 22a with respect to the base table 21d (arrow E1 shown in FIG. 13A), and supports the conveyor unit 23 and the substrate 2 from below. The upper surface of the substrate 2 is brought into contact with the lower surface of the mask 15 by integrally raising the lower receiving portion 24 (FIG. 13 (a), contacting step of step ST6 shown in FIG. 9). As a result, the electrode 3 of the substrate 2 and the pattern hole 15a of the mask 15 are matched.

  When the control device 50 brings the substrate 2 into contact with the mask 15, the operation of the screen printing machine 1 is temporarily interrupted, and the operator OP is prompted to supply the paste Pst via an image display by a display device (not shown). The operator OP determines whether or not to supply (supplement) the paste Pst based on the amount of the paste Pst currently remaining on the mask 15, and determines that the supply of the paste Pst should be performed separately. The paste Pst is supplied onto the mask 15 by the prepared paste supply syringe 60 (FIG. 13B). When the supply of the paste Pst is finished, the operation restart button 61 (FIG. 8) is operated. The operator OP operates the operation restart button 61 even when it is determined that the supply of the paste Pst is unnecessary.

  After step ST6, the control device 50 determines whether or not the operation restart button has been operated (first determination step of step ST7 shown in FIG. 9), and determines that the operation restart button 61 has been operated. In this case, after the operation interruption of the screen printing machine 1 is canceled and one of the two squeegees 16 is lowered and brought into contact with the upper surface of the mask 15 (an arrow F1 shown in FIG. 14A). Squeegee lowering step of step ST8 shown in FIG. 9), the squeegee 16 is slid on the mask 15 by moving the squeegee base 37 in the front-rear direction (Y-axis direction) (in FIGS. 14B and 15A). Arrow G) and scraping the paste Pst with the paste scraping surface 41a of the blade portion 41 of the squeegee 16 (FIG. 15A), through the pattern hole 15a of the mask 15. The electrodes 3 of the substrate 2 to transfer the paste Pst (transfer step of the step ST9 shown in FIG. 9).

  Here, the front squeegee 16 is moved backward on the mask 15 from the upper surface area of the front clamp member 25a to the upper surface area of the rear clamp member 25a (on the right side in FIG. 14 in the direction of arrow G). The rear squeegee 16 is moved forward on the mask 15 from the upper surface region of the rear clamp member 25a to the upper surface region of the front clamp member 25a (on the left side in FIG. 14 in the direction opposite to the arrow G). To.

  When the transfer process is completed, the controller 50 raises the squeegee 16 on the side in contact with the mask 15 (arrow F2 shown in FIGS. 14B and 15B). As a result, the squeegee 16 is separated from the upper surface of the mask 15, and a pair of wire holding members 45 that hold both ends of the wire 44 are formed on the pair of wall-like members 42 provided at both ends of the squeegee 16. Since the wire 44 is guided by the pair of guide grooves 42a and descends relative to the wall-like member 42, the paste 44 is scraped in a state where the horizontally extending wire 44 is in contact with or close to the paste scraping surface 41a of the blade portion 41. The wire P moves downward relative to the surface 41a (arrow F3 shown in FIG. 15B), and the wire 44 removes the paste Pst adhering to the paste scraping surface 41a of the blade portion 41 after the paste Pst is transferred. (FIG. 15 (a) → FIG. 15 (b). Squeegee rise / paste removal step of step ST10 shown in FIG. 9).

  When the paste transfer process is completed, the controller 50 lowers the lifting table 22a with respect to the base table 21d (arrow E2 shown in FIG. 16A), and separates the substrate 2 from the mask 15 to release the plate. (FIG. 16A) The plate separation process in step ST11 shown in FIG. As a result, the paste Pst is printed on the electrode 3 of the substrate 2.

  The control device 50 opens the clamp member 25a (the arrow C2 shown in FIG. 16 (b)) after the plate separation process is finished, releases the clamp of the substrate 2, and the substrate 2 is supported by the lower receiving portion 24. Then, the lower receiving portion 24 is lowered with respect to the lifting table 22a (arrow D3 shown in FIG. 16C). As a result, first, both end portions of the substrate 2 are placed on the front and rear belt conveyors 23b, and then the upper end of the lower receiving portion 24 is spaced downward from the lower surface of the substrate 2 (FIG. 16C). Thereby, the support of the substrate 2 by the substrate holding unit 25 is released (substrate support releasing step of step ST12 shown in FIG. 9).

  When the substrate support releasing step is completed, the control device 50 operates the horizontal moving unit 21 included in the substrate holding and moving unit 12 to adjust the position of the conveyor unit 23 with respect to the substrate carry-out conveyor 13, and then the conveyor unit 23 and the substrate The carry-out conveyor 14 is operated in an interlocked manner, the substrate 2 on the conveyor unit 23 is transferred to the substrate carry-out conveyor 14, and the substrate 2 is carried out as it is to the outside of the screen printing machine 1 (substrate carry-out process of step ST13 shown in FIG. 9).

  When the substrate carry-out step is completed, the control device 50 determines whether there is another substrate 2 on which screen printing is to be performed (substrate presence determination step in step ST14 shown in FIG. 9). As a result, if there is another substrate 2 to be screen-printed, the process returns to step ST1 to carry in a new substrate 2, and if there is no other substrate 2 to be screen-printed, a series of screen printing operations. Exit.

  As described above, the screen printing machine 1 according to the present embodiment moves in the horizontal plane in a state in which the mask 15 that is in contact with the substrate 2 and the mask 15 that is in contact with the substrate 2 are in contact with each other from above. Thus, the paste Pst supplied on the mask 15 is scraped by the paste scraping surface 41a of the blade portion 41 to transfer the paste Pst to the substrate 2, and at a position facing the paste scraping surface 41a of the squeegee 16. When the wire 44 as a squeegee-facing member provided extending in the horizontal direction and the squeegee 16 that has finished transferring the paste Pst to the substrate 2 are raised relative to the mask 15, the wire 44 scrapes the paste of the squeegee 16. The wire 44 is designed to move downward relative to the paste scraping surface 41a while being in contact with or close to 41a. It has become a thing with a guide mechanism to be.

  The guide mechanism includes a pair of wall-like members 42 provided at both ends of the squeegee 16, a wire holding member 45 as a pair of holding members that hold both ends of the wire 44, and a pair of wall-like members 42. When the squeegee 16 formed along the paste scraping surface 41a of the squeegee 16 movably supports the pair of wire holding members 45 and finishes transferring the paste Pst to the substrate 2, the squeegee 16 rises with respect to the mask 15. The wire 44 includes a pair of guide grooves 42a for guiding the pair of wire holding members 45 so as to move downward relative to the paste scraping surface 41a in a state where the wire 44 is in contact with or close to the paste scraping surface 41a of the squeegee 16. ing.

  Further, in the screen printing method according to the present embodiment, the process of bringing the mask 15 into contact with the substrate 2 (contact process in step ST6) and the squeegee 16 in a state of being in contact with the mask 15 in contact with the substrate 2 from above are horizontal. Step of transferring the paste Pst onto the substrate 2 by moving the paste Pst supplied on the mask 15 by the paste scraping surface 41a of the blade portion 41 of the squeegee 16 by moving inward (step ST9 transfer step) Then, the squeegee 16 that has finished transferring the paste Pst to the substrate 2 is raised with respect to the mask 15, and a wire 44 that extends in a horizontal direction at a position facing the paste scraping surface 41 a of the squeegee 16 is provided. Relative to the paste scraping surface 41a in a state where the paste scraping surface 41a is in contact with or close to the paste scraping surface 41a. By guiding the wire 44 to move downward, the process includes a step of removing the paste Pst adhering to the paste scraping surface 41a of the squeegee 16 by the wire 44 (step ST10 squeegee raising / paste removing step). Yes.

  In the screen printing apparatus 1 and the screen printing method in the present embodiment, when the squeegee 16 that has finished transferring the paste Pst to the substrate 2 rises with respect to the mask 15, the position facing the paste scraping surface 41a of the squeegee 16 Since the wire 44 extending in the horizontal direction is moved downward relative to the paste scraping surface 41a in a state of being in contact with or close to the paste scraping surface 41a of the squeegee 16, the wire 44 Thus, the removal range of the paste Pst can be set over the entire paste scraping surface 41a of the squeegee 16, and the removal of the paste Pst from the squeegee 16 can be sufficiently performed. In particular, as in the screen printing machine 1 in the present embodiment, each wire holding member 45 brings the wire 44 into each guide groove by bringing the outer peripheral edge into contact with the mask 15 with the squeegee 16 in contact with the mask 15. If the disk part 45b located above the lower end part of 42a is provided, the removal range of the paste Pst can be easily set by adjusting the radius of the disk part 45b.

  Further, in the screen printing machine 1 according to the present embodiment, the pair of wall-like members 42 are disposed from both ends of the paste scraping surface 41a of the squeegee 16 when the paste Pst is transferred to the substrate 2 by the squeegee 16. Since the wire 44 is moved up and down by using a member originally present in the squeegee 16, the paste removing means can be constructed with an inexpensive structure. Can be realized.

  Although the embodiment of the present invention has been described so far, the present invention is not limited to the above. For example, in the present embodiment, the state in which the squeegee-facing member extending in the horizontal direction at a position facing the paste scraping surface 41a of the squeegee 16 is extended in the horizontal direction without bending by the pair of wire holding members 45 is maintained. The wire 44 is not necessarily the wire 44 but may be a rod-shaped member, a wire-shaped member, or the like.

  Further, when the squeegee 16 that has finished transferring the paste Pst to the substrate 2 rises with respect to the mask 15, the squeegee facing member (wire 44) scrapes the paste in a state where the squeegee counter member (wire 44) is in contact with or close to the paste scraping surface 41a of the squeegee 16. In the above-described embodiment, the guide mechanism for guiding the squeegee-facing member so as to move downward relative to the approach surface 41a is a pair of wall-like members 42 provided at both ends of the squeegee 16, and the squeegee-facing member. A pair of holding members (wire holding members 45) that hold both ends of the member and a pair of wall-like members 42 formed along the paste scraping surface 41a of the squeegee 16 to support the pair of holding members movably. When the squeegee 16 that has finished transferring the paste Pst to the substrate 2 rises with respect to the mask 15, the squeegee-facing member scrapes the paste on the squeegee 16. The guide mechanism is composed of a pair of guide grooves 42a that guide the pair of holding members so as to move downward relative to the paste scraping surface 41a in contact with or close to the surface 41a. Is not limited to the one described in the above embodiment as long as it fulfills the above function.

To provide a screen printing machine capable of removing paste from the squeegee sufficiently.

DESCRIPTION OF SYMBOLS 1 Screen printer 2 Board | substrate 15 Mask 16 Squeegee 41a Paste scraping surface 42 Wall-shaped member (guide mechanism)
42a Guide groove (guide mechanism)
44 Wire (squeegee facing member)
45 Wire holding member (guide mechanism, holding member)
45b Disk part Pst paste

Claims (2)

A mask in contact with the substrate;
A squeegee that moves the paste supplied on the mask by a paste scraping surface to transfer the paste to the substrate by moving in a horizontal plane direction while being in contact with the mask in contact with the substrate from above.
A squeegee-facing member provided extending horizontally in a position facing the paste scraping surface of the squeegee;
After finishing the transfer of the paste to the substrate, the squeegee rises with respect to the mask so that the squeegee-facing member is in contact with or close to the paste scraping surface of the squeegee. A guide mechanism for guiding the squeegee-facing member so as to relatively move downward ,
The guide mechanism includes a pair of wall-shaped members provided at both ends of the squeegee, a pair of holding members that hold both ends of the squeegee-facing member, and the paste scraping of the squeegee on the pair of wall-shaped members. The squeegee-facing member is formed along the abutment surface and movably supports the pair of holding members, and the squeegee-facing member is lifted with respect to the mask after finishing the transfer of the paste to the substrate. A pair of guide grooves that guide the pair of holding members so as to move downward relative to the paste scraping surface in contact with or close to the paste scraping surface;
Each holding member moves down in the guide groove relative to the wall-like member as the squeegee rises with respect to the mask and moves the squeegee-facing member to the lower end side of each guide groove. Is supposed to let
Each holding member includes a disk portion that positions the squeegee-facing member above the lower end of each guide groove by bringing an outer peripheral edge into contact with the mask while the squeegee is in contact with the mask. A screen printing machine characterized by that. The pair of wall-shaped members are composed of a paste leakage preventing member that prevents the paste from leaking out from both ends of the paste scraping surface of the squeegee when the paste is transferred to the substrate by the squeegee. The screen printing machine according to claim 1 .

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