JP5099273B2 - Screen printing machine - Google Patents

Description

  The present invention relates to a screen printing machine that prints a paste on a substrate through a pattern hole of a mask pattern formed on a mask plate.

  The screen printing machine has a mask plate on which a mask pattern corresponding to the arrangement of electrodes on the substrate is formed, and a squeegee attached to a squeegee base that reciprocates horizontally above the mask plate. Solder paste or conductive paste supplied on the mask plate by sliding it on the mask plate by reciprocating with the squeegee base with the squeegee in contact with the mask plate from above. This paste is filled in the pattern holes of the mask pattern, and then the substrate and the mask plate are separated to transfer the paste to the substrate.

  In such a screen printing machine, when the paste on the mask plate is reduced, the paste is supplied onto the mask plate by the paste supply syringe (Patent Document 1). This paste supply syringe is separate from the squeegee. In addition to those that can be moved, there are those that are attached to the squeegee base and move together with the squeegee. In the latter case, not only can the mechanism be simplified, but also when the paste in the paste supply syringe becomes insufficient, the replenishment work can be performed quickly, thus increasing the productivity of the substrate. Can do.

JP-A-4-107145

  In such a screen printing machine, it is necessary for the operator to manually refill the paste supply syringe from the front of the screen printing machine, and for this purpose, the paste supply syringe is viewed from the squeegee base. It is preferable to be provided in the front area. However, on the other hand, the squeegee needs to be replaced as appropriate according to the size of the substrate, etc. If the paste supply syringe is provided in the area in front of the squeegee base, it is difficult to replace the squeegee and workability is poor. There was a problem.

  Therefore, an object of the present invention is to provide a screen printer capable of easily performing both the squeegee replacement operation and the paste replenishment operation in the paste supply syringe.

  The screen printing machine according to claim 1 is provided with a mask plate that is in contact with the upper surface of the substrate and on which a mask pattern corresponding to the arrangement of electrodes on the substrate is formed, and a squeegee base that reciprocates horizontally above the mask plate Attached and moved in the horizontal direction together with the squeegee base while being in contact with the mask plate from above and sliding on the mask plate, the paste scraped on the mask plate is filled into the pattern holes of the mask pattern. The squeegee and the vertical plane parallel to the reciprocating direction of the squeegee base from the squeegee base are swingably mounted around an axis extending downwardly with respect to the horizontal line so that the lower end nozzle portion is positioned directly under the squeegee. The paste supply posture extending in the oblique direction with respect to the vertical line in the vertical plane and the paste supply posture A paste supply syringe provided in an area in front of the squeegee base as viewed from the working position side, and a mask plate, which can be changed between a retracted attitude swinging approximately 90 degrees around the axis. A sensor for detecting the upper paste, and a syringe posture changing means for swinging the paste supply syringe between the paste supply posture and the retracted posture, and it is necessary to supply the paste based on the detection result of the sensor When it is determined, the paste supply syringe changes from the retracted position to the paste supply position and supplies the paste onto the mask plate.

  In the present invention, the paste supply syringe is attached so as to be swingable around an axis extending downwardly with respect to the horizontal line in a vertical plane parallel to the reciprocating direction of the squeegee base from the squeegee base, and the nozzle portion at the lower end is attached to the squeegee. It is possible to change the posture between the paste supply posture extending obliquely with respect to the vertical line in the vertical plane and the storage posture rotated approximately 90 degrees around the axis from the paste supply posture so as to be located immediately below the vertical line. So, even if the paste supply syringe is provided in the front area when viewed from the operator's work position side of the squeegee base so that the paste refilling operation into the paste supply syringe is easy, Replacing the squeegee can open the area in front of the squeegee base by placing the paste supply syringe in the retracted position. It can be carried out easily. In addition, when it is determined that the paste supply is necessary based on the detection result of the sensor, the paste supply syringe changes from the retracted position to the paste supply position to supply the paste onto the mask plate, and the front clamp Since an additional amount of paste is added to the paste on the member, the reduced amount of paste is restored.

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 plate of the screen printer in one embodiment of this invention The fragmentary perspective view of the squeegee base with which the screen printer in one embodiment of this invention is provided. The side view of the vicinity of the squeegee and paste supply syringe of the screen printing machine in one embodiment of the present invention The front view of the vicinity of the squeegee and paste supply syringe of the screen printing machine in one embodiment of this invention (A) (b) (c) Front view of the vicinity of the squeegee and paste supply syringe of the screen printing machine in one embodiment of the present invention. (A) (b) The figure explaining operation | movement of the cover member of the screen printing machine in one embodiment of this invention. The block diagram which shows the control system of the screen printer in one embodiment of this invention (A) Perspective view of rear squeegee of screen printer in one embodiment of the present invention (b) Side view of rear squeegee of screen printer in one embodiment of the present invention The flowchart which shows the flow of the screen printing process 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) (c) Operation explanatory diagram of the screen printer in one embodiment of the present invention (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. 1, 2, and 3, the screen printer 1 according to the present embodiment screen-prints a paste such as a solder paste or a conductive paste on an electrode 3 provided on the surface of a substrate 2. A substrate positioning unit 12 provided on the table 11 for carrying the substrate 2 and positioning it at a predetermined work position, a mask plate 13 provided above the substrate positioning unit 12, a paste supply syringe 14, a pair of squeegees 15, A camera unit 16 is provided. Hereinafter, for convenience of explanation, the conveyance direction (left and right direction in FIG. 1) of the substrate 2 in the screen printing machine 1 is the X axis direction, and the horizontal direction perpendicular to the X axis direction (up and down direction in FIG. 1) is the Y axis direction. The vertical direction (the vertical direction in FIG. 2) is taken as the Z-axis direction. Further, the operator OP (FIG. 1) of the screen printing machine 1 performs the operation on the screen printing machine 1 (lower side in FIG. 1) is the front side of the screen printing machine 1 and the opposite side (upper side in FIG. 1). ) Is the rear of the screen printer 1.

  2 and 3, the substrate positioning unit 12 is provided for the Y table 21a that moves in the Y-axis direction with respect to the base 11, the X table 21b that moves in the X-axis direction with respect to the Y table 21a, and the X table 21b. A horizontal table positioning part 21 having a θ table 21c that rotates about the Z axis and a base table 21d fixed to the top surface of the θ table 21c, and a first that moves up and down relative to the base table 21d of the horizontal plane positioning part 21 Up and down direction positioning unit 22 comprising up and down table 22a, second up and down table 22b that moves up and down relative to first up and down table 22a, and lower receiving unit 22c provided on the upper surface of second up and down table 22b, up and down direction positioning unit 22 The substrate 2 is attached to the first lifting table 22a and transports the substrate 2 in the X-axis direction. A positioning conveyor 23 comprising a pair of belt conveyor mechanisms for positioning at a predetermined work position, and opening / closing operation in the Y-axis direction above the positioning conveyor 23, both sides of the substrate 2 on the positioning conveyor 23 in the Y-axis direction are It comprises a pair of clamp members (clampers) 24 that are clamped (clamped) from the side.

  1 and 2, the positions of the positioning conveyor 23 constituting the substrate positioning unit 12 on both sides in the X-axis direction (upstream and downstream in the transport direction of the substrate 2) are outside the screen printing machine 1 (FIG. 1). 2 on the left side of the drawing in FIG. 2 and transports (loads) the substrate 2 to the positioning conveyor 23, and transfers the substrate 2 transferred from the positioning conveyor 23 to the outside of the screen printing machine 1 (see FIG. 2). A carry-out conveyor 26 for carrying (carrying out) is provided on the right side of FIG. 1 and FIG.

  In FIG. 1 and FIG. 4, the mask plate 13 is supported on four sides by a frame member 13w having a rectangular shape in plan view, and a plurality of electrodes 3 on the substrate 2 are formed in a rectangular region surrounded by the frame member 13w. A mask pattern MP including a large number of pattern holes ph provided corresponding to (that is, according to the arrangement of the electrodes 3) is formed.

  In FIG. 1, two sets of substrate side alignment marks mk are provided at diagonal positions of the substrate 2. On the other hand, in FIG. 4, the mask plate 13 is provided with a pair of mask side alignment marks MK arranged in correspondence with the substrate side alignment marks mk.

  The mask plate 13 is provided with a pair of mask support rails 27 provided by the operator OP holding both ends of the mask plate 13 with both hands so as to extend from the front of the screen printing machine 1 above the substrate positioning unit 12 in the Y-axis direction. (FIG. 1 and FIG. 4), and by pushing backward until the leading portion of the frame member 13w comes into contact with a stopper 27a (FIGS. 1 and 4) provided on the mask support rail 27, a predetermined amount is obtained. Installed in position.

  1 and 2, a pair of gate-type frames 28 are provided on the base 11 so as to straddle the carry-in conveyor 25 and the carry-out conveyor 26 in the Y-axis direction, respectively. Both ends of the X-axis stage 29a extending in the direction are supported to be slidable in the Y-axis direction. A camera support stage 29b is provided on the X-axis stage 29a so as to be movable in the X-axis direction. The camera unit 16 is attached to the camera support stage 29b. The camera unit 16 includes a first camera 16a whose imaging field is directed downward and a second camera 16b whose imaging field is directed upward (FIG. 3).

  In FIG. 1, both ends of a squeegee base 30 extending in the X-axis direction are supported by the pair of portal frames 28, and the squeegee base 30 can reciprocate in the Y-axis direction along the portal frame 28. ing. The squeegee base 30 is provided with the pair of squeegees 15 facing each other in the Y-axis direction. Each squeegee 15 is made of a “spar” -like member extending in the X-axis direction, and is attached to the squeegee base 30 so as to be movable up and down. Hereinafter, the squeegee 15 provided in the front of the pair of squeegees 15 is referred to as a front squeegee 15a, and the squeegee 15 provided in the rear is referred to as a rear squeegee 15b.

  As shown in FIGS. 5 and 6, the paste supply syringe 14 is attached to the front portion of the squeegee base 30 (on the left side in FIG. 6) via a syringe attachment bracket 31, and the syringe attachment bracket 31 is attached to the squeegee base 30. The slider 32 provided on the rear surface opposite to the squeegee base 30 is engaged with a slide guide 33 provided with the front surface of the squeegee base 30 extending in the X-axis so as to be perpendicular to the reciprocating movement direction (Y-axis direction) of the squeegee base 30 ( It is movable in the X axis direction).

  5, 6, and 7, a pair of motor mounting brackets (motor mounting bracket 34 and driven pulley mounting bracket 35) are attached to both ends in the X-axis direction of the front end of the upper surface of the squeegee base 30. A syringe moving motor 36 is attached to the bracket 34. A drive shaft 36a (FIG. 6) of the syringe movement motor 36 extends horizontally through the motor mounting bracket 34, and a drive pulley 37 is attached to the tip thereof. On the other hand, a driven pulley 38 is attached to a pulley shaft (not shown) extending horizontally forward from the driven pulley mounting bracket 35.

  In FIGS. 5, 6, and 7, a toothed belt 39 is stretched over the driving pulley 37 and the driven pulley 38, and the upper surface of the upper portion of the syringe mounting bracket 31 is fixed to the lower surface of the toothed belt 39. Yes. For this reason, when the drive shaft 36a of the syringe moving motor 36 is driven and the drive pulley 37 rotates, the toothed belt 39 meshed with the drive pulley 37 and the driven pulley 38 travels in the X-axis direction, and accordingly, the syringe mounting bracket 31 (therefore, the paste supply syringe 14), the region in front of the squeegee base 30 is in a direction (X-axis direction) perpendicular to the reciprocating direction of the squeegee base 30 (Y-axis direction) with respect to the squeegee base 30. Moving. In other words, in the present embodiment, the mechanism including the syringe moving motor 36, the drive pulley 37, the driven pulley 38, and the toothed belt 39 causes the paste supply syringe 14 to be horizontally orthogonal to the reciprocating movement direction (Y-axis direction) of the squeegee base 30. A syringe moving mechanism 40 is configured to move in the direction.

  Here, the paste supply syringe 14 performs an operation of supplying a paste such as a solder paste or a conductive paste stored in an obliquely downward direction in the paste supply posture shown in FIG. 6. Note that the movement range (movement stroke) of the paste supply syringe 14 in the X-axis direction by the syringe movement mechanism 40 has a range that can cover at least the width (dimension in the X-axis direction) of the substrate 2 handled by the screen printing machine 1. Shall.

  5, 6, and 7, the front surface of the syringe mounting bracket 31 provided in front of the squeegee base 30 is in a vertical plane (in FIG. 6) parallel to the reciprocating direction (Y-axis direction) of the squeegee base 30. A syringe holder 42 is provided that can swing (rotate) around an axis 41 that extends obliquely forward and downwardly downward with respect to the horizontal line HL (FIG. 6) in the YZ plane parallel to the paper surface. Is held by the syringe holder 42 and can swing (rotate) about the axis 41. For this reason, the paste supply syringe 14 held by the syringe holder 42 has the vertical plane (YZ plane) aligned with the vertical line VL (FIG. 6) so that the lower end nozzle portion 14a is positioned directly below the front squeegee 15a. The paste supply posture (FIGS. 5, 6, and 7) extending obliquely backward (a right side in FIG. 6) with respect to the predetermined angle θ and the storage rotated about 90 degrees around the axis 41 from the paste supply posture Posture conversion between postures (FIG. 1) is possible. Here, the predetermined angle θ is arbitrarily set as an angle at which the paste can be supplied directly below the front squeegee 15a in a state where the paste supply syringe 14 is in the paste supply posture.

  As shown in FIGS. 5 and 7, a guide member mounting bracket 43 extending downward is provided at the lower front portion of the squeegee base 30, and the X of the squeegee base 30 is disposed on the front surface of the guide member mounting bracket 43. A guide member (cam member) 44 having a curved guide surface 44a that gently descends toward the center in the axial direction is provided to protrude forward.

  From the state in which the paste supply syringe 14 is in the paste supply posture at the center in the Y-axis direction of the squeegee base 30, the syringe movement motor 36 is driven so that the paste supply syringe 14 is in the direction toward the guide member 44 side of the squeegee base 30 (see FIG. 8 on the left side of the paper surface) and reaches the vicinity of the end of the movement stroke of the paste supply syringe 14 (arrow A1 shown in FIG. 8A). A first cam follower 45 as a driven member provided at a lower position contacts the guide surface 44a of the guide member 44 (FIG. 8A). After that, when the squeegee base 30 further moves in the direction toward the end of the guide member 44 (arrow A2 shown in FIG. 8B), the first cam follower 45 rolls (guides) on the guide surface 44a. Therefore, the lower portion of the paste supply syringe 14 is pushed up by the guide member 44 and swings around the axis 41 (FIG. 8B), and finally becomes a horizontal retracted posture swinging approximately 90 degrees ( FIG. 8 (c)).

  That is, in the present embodiment, the guide member 44 is arranged in a horizontal direction (X-axis direction) perpendicular to the reciprocating movement direction (Y-axis direction) of the squeegee base 30 by the syringe moving mechanism 40 when the paste supply syringe 14 in the paste supply posture is used. When moved, the first cam follower 45 provided in a portion below the axis 41 of the paste supply syringe 14 is guided, and the paste supply syringe 14 is swung about the axis 41 by approximately 90 degrees to paste the paste supply syringe 14. Is in the retracted position.

  The squeegee 15 needs to be appropriately replaced according to the size of the substrate 2 and the operator OP inserts his hand from the front of the screen printing machine 1 to the lower side of the squeegee base 30 in the replacement operation of the squeegee 15. However, in the screen printing machine 1 according to the present embodiment, since the paste supply syringe 14 can be changed from the paste supply posture to the retracted posture as described above, the paste supply syringe 14 is changed to the squeegee base. Even in the case where it is provided in the front area as seen from the working position side of the operator OP of 30, the area in front of the squeegee base 30 can be opened by placing the paste supply syringe 14 in the retracted posture. The replacement work of the squeegee 15 can be easily performed. As a mechanism for changing the posture of the paste supply syringe 14 from the paste supply posture to the retracted posture, the paste supply syringe 14 is orthogonal to the reciprocating direction of the squeegee base 30 in order to supply the paste Pst evenly in the width direction of the substrate 2. Since the syringe moving mechanism 40 that moves in the horizontal direction is used, the configuration in which the paste supply syringe 14 is in the retracted position can be simplified.

  5 and 7, the front surface of the guide member mounting bracket 43 is located at the center side of the squeegee base 30 (the right side in FIG. 5 and FIG. 7) from the position where the guide member 44 is provided. A lid member 46 is attached. One end of the lid member 46 is pivotally supported by a lid member swinging shaft 47 provided so as to project horizontally forward (Y-axis direction) from the front surface of the guide member mounting bracket 43. The opposite end (non-pivot end) is located on the center side of the squeegee base 30 of the lid member swinging shaft 47, with the end (pivot end) on the side pivoted to the center. The horizontal posture (non-closed posture; FIGS. 5, 8 (a) and 9 (a)) that contacts the first stopper 43 a (FIG. 7) provided on the front surface of the guide member mounting bracket 43 from above, It is swingable between a vertical posture (closed posture; FIGS. 8 (c) and 9 (b)) in which the pivot-side end is located immediately above the lid member swing shaft 47.

  5 and 9 (a) and 9 (b), a pressing piece 46a extending in a direction orthogonal to the lid member 46 is provided on the rear side (squeegee base 30 side) of the end of the pivot member on the lid member 46. When the lid member 46 is in the non-closed posture, the pressing piece 46a extends vertically upward from the pivot side end of the lid member 46 (see FIGS. 5, 8 (a) and 8). 9 (a)), when the lid member 46 is in the closed position, the lid member 46 is positioned so as to extend in the horizontal direction from the pivotally supported end of the lid member 46 to the side opposite to the center side of the squeegee base 30 (see FIG. 8 (c) and FIG. 9 (b)), a second stopper 43b (FIGS. 5 and 7) provided on the front surface of the guide member mounting bracket 43 is contacted from above (FIG. 8 (c)). ).

  5 and 7, the syringe mounting bracket 31 has a moving direction (X-axis direction) of the syringe mounting bracket 31 opposite to the side on which the guide member 44 is provided (FIGS. 5 and 7). Then, an arm member 48 extending in the horizontal direction is provided on the right side of the drawing. The distal end portion of the arm member 48 is a bent portion 48a that is bent downward and extended as shown in FIGS. 5, 7, and 9, and the bent portion 48a is horizontally forward (Y-axis direction). A second cam follower 49 that is rotatable around a protruding shaft (not shown) is attached.

  As described above, in the process in which the syringe moving motor 36 is driven and the paste supply syringe 14 changes its posture from the paste supply posture to the retracted posture, the second cam follower 49 provided in the bent portion 48a of the arm member 48 is not After coming into contact with the pressing piece 46a of the lid member 46 in the closed position from the center side of the squeegee base 30 (the right side in FIG. 5 and FIG. 7), the lid member 46 is moved to the guide member 44 side (of FIGS. 5 and 7). (Left arrow on the paper surface) (arrow B1 shown in FIG. 9A). As a result, the lid member 46 swings about the lid member swinging shaft 47 and changes from a horizontal non-closed posture to a vertical closed posture (arrow B2 shown in FIG. 9B), immediately after the retracted posture is reached. The nozzle part 14a of the paste supply syringe 14 is closed from the side (covered). Thus, in the retracted posture in which the paste supply syringe 14 is rotated by approximately 90 degrees from the paste supply posture, the nozzle portion 14a is closed (covered) by the lid member 46, so that the paste supply syringe 14 receives the paste Pst. The paste Pst is prevented from dripping from the nozzle portion 14a in the storage posture in which it is not supplied.

  When the paste supply syringe 14 is changed from the retracted posture to the paste supply posture, the lid member 46 in which the nozzle portion 14a of the paste supply syringe 14 is in the vertical posture is moved to the center portion side of the squeegee base 30 (see FIGS. 5 and 7). The cover member 46 swings about the cover member swinging shaft 47 and changes from the vertical closed position to the horizontal non-closed position (the pressing piece 46a changes from the horizontal position to the vertical position). Accordingly, the closed state of the nozzle portion 14a of the paste supply syringe 14 by the lid member 46 is released (FIG. 8 (c) → FIG. 8 (b) → FIG. 8 (a)). Note that the lid member 46 may be biased by a spring or the like in the direction of the non-closed posture so that the lid member 46 is surely in the non-closed posture in a state where the lid member 46 is not pressed by the second cam follower 49.

  In this screen printing machine 1, each operation of the carry-in conveyor 25, the positioning conveyor 23, and the carry-out conveyor 26 as a board conveyance path for carrying the board 2 is carried by the control device 50 (FIG. 10), which is a board conveyance composed of an actuator not shown. The clamp operation of the substrate 2 by the clamp member 24 is performed by controlling the operation of the path operation mechanism 51 (FIG. 10), and the operation control of the clamp member operation mechanism 52 (FIG. 10) including an actuator (not shown) is performed by the control device 50. Made by doing.

  Movement of the Y table 21a relative to the base 11 in the Y-axis direction, movement of the X table 21b relative to the Y table 21a in the X-axis direction, rotation of the θ table 21c relative to the X table 21b (ie, the base table 21d) around the Z axis The control device 50 controls the Y table drive motor My and X for each operation of raising and lowering the first raising and lowering table 22a with respect to the base table 21d and raising and lowering the second raising and lowering table 22b with respect to the first raising and lowering table 22a (that is, the receiving unit 22c). This is done by controlling the operation of the substrate positioning unit operating mechanism 53 (FIG. 10) including an actuator such as a table driving motor Mx (see FIGS. 2 and 3).

  Movement of the camera unit 16 in the horizontal plane, that is, movement of the X-axis stage 29a in the Y-axis direction with respect to the pair of portal frames 28 and movement of the camera support stage 29b in the X-axis direction with respect to the X-axis stage 29a Each control is performed when the control device 50 controls the operation of the camera unit moving mechanism 54 (FIG. 10) including an actuator (not shown).

  The operation control of the squeegee base 30 for reciprocating the pair of squeegees 15 in the Y-axis direction is performed by the control device 50 controlling a squeegee moving mechanism 55 (FIG. 10) including an actuator (not shown). The raising / lowering operation of each squeegee 15 with respect to the squeegee base 30 is performed by controlling the operation of a squeegee raising / lowering cylinder 56 attached to the upper part of the squeegee base 30.

  The movement control of the paste supply syringe 14 that moves the paste supply syringe 14 in the X-axis direction is performed by the control device 50 performing the operation control of the syringe movement motor 36 described above. In addition, the supply operation of the paste Pst by the paste supply syringe 14 is performed by the operation control of the paste supply mechanism 57 (FIG. 10) including an actuator or the like that is not illustrated by the control device 50.

  In FIG. 11 (a), the squeegee surface of the rear squeegee 15b (the surface for scraping the paste Pst and facing forward in the rear squeegee 15b) is provided on one end side in the width direction (X-axis direction) of the rear squeegee 15b. And a light receiver 58a that projects the inspection light L in the X-axis direction and a light receiver 58b that is provided on the other end side in the width direction of the rear squeegee 15b and receives the inspection light L projected by the light projector 58a. A paste height detection sensor 58 is provided.

  The control device 50 detects that the inspection light L emitted by the light projector 58a of the paste height detection sensor 58 is received by the light receiver 58b in a state where the paste Pst on the mask plate 13 is in contact with the rear squeegee 15b. In this case (in the state shown in FIG. 11B), the height h (FIG. 11B) of the paste Pst corresponds to the height of the inspection light L measured from the upper surface of the mask plate 13. It is below the predetermined value (predetermined height) H (FIG. 11B), and it is recognized that the supply of the paste Pst is necessary.

  The first camera 16a constituting the camera unit 16 is controlled by the control device 50 to image the substrate side alignment mark mk of the substrate 2 positioned at the work position by the substrate positioning unit 12, and the second camera 16b is Under the control of the control device 50, the mask side alignment mark MK provided on the mask plate 13 is imaged. Both the image data obtained by imaging with the first camera 16a and the image data obtained by imaging with the second camera 16b are input to the control device 50 (FIG. 10).

  Next, the operation of the screen printing machine 1 will be described with reference to the flowchart of FIG. 12 and the operation explanatory diagrams of FIGS. The control device 50 of the screen printing machine 1 detects that the substrate 2 has been put into the carry-in conveyor 25 from the operator OP (or another device (not shown) installed on the upstream side of the screen printing machine 1) by a detection means (not shown). Then, the carry-in conveyor 25 and the positioning conveyor 23 are operated in conjunction to carry the substrate 2 into the screen printing machine 1 (arrow C shown in FIG. 13A), and the positioning conveyor 23 conveys it by a detection means (not shown). When it is detected that the substrate 2 has reached a predetermined work position, the operation of the positioning conveyor 23 is stopped and the substrate 2 is positioned (FIG. 13 (b). Loading and positioning step of the substrate, step ST1 in FIG. 12). .

  After positioning the substrate 2 to the work position, the control device 50 raises the second lifting table 22b of the vertical positioning portion 22 included in the substrate positioning unit 12 with respect to the first lifting table 22a (FIG. 14A). ) When the arrow D1) shown in the figure is in contact with the lower surface of the substrate 2, the raising of the second elevating table 22b is stopped. Then, the clamp member 24 is actuated to clamp both sides of the substrate 2 on the positioning conveyor 23 (arrow E1 shown in FIG. 14 (b), substrate clamping step, step ST2 in FIG. 12).

  When the control device 50 clamps and holds the substrate 2 with the clamp member 24, the control device 50 raises the second lift table 22b again with respect to the first lift table 22a (arrow D2 shown in FIG. 14C), and receives the lower support. The substrate 2 is pushed up by the unit 22c. As a result, the substrate 2 rises while sliding both ends with respect to the clamp member 24 (thereby, the substrate 2 is separated upward from the positioning conveyor 23), and the upper surface of the substrate 2 is substantially the same height as the upper surfaces of both the clamp members 24. At this point, the push-up of the receiving unit 22c is stopped (FIG. 14 (c)).

  When the upper surface of the substrate 2 is almost at the same height as the upper surfaces of the clamp members 24, the control device 50 controls the operation of the camera unit moving mechanism 54 to stop the camera unit 16c. Is moved to a region between the substrate 2 and the mask plate 13 to cause the first camera 16a to image the substrate-side alignment mark mk provided on the substrate 2, and to be provided on the mask plate 13 by the second camera 16b. The mask side alignment mark MK is imaged. Then, the position of the substrate 2 is grasped from the image data of the obtained substrate side alignment mark mk, and the position of the mask plate 13 is grasped from the obtained image data of the mask side alignment mark MK.

  After grasping the position of the substrate 2 and the position of the mask plate 13, the control device 50 performs the operation control of the in-horizontal positioning unit 21 provided in the substrate positioning unit 12 to move the substrate 2 in the horizontal direction, thereby aligning the substrate side alignment mark. The substrate 2 and the mask plate 13 are aligned in the horizontal direction so that mk and the mask side alignment mark MK are vertically opposed to each other. When the horizontal alignment between the substrate 2 and the mask plate 13 is completed, the control device 50 raises the first lifting table 22a of the vertical positioning portion 22 provided in the substrate positioning unit 12 with respect to the base table 21d (see FIG. The arrow D3 shown in FIG. 15 (a), and the upper surface, which is the printing surface of the substrate 2, is brought into contact with the mask plate 13 from below (FIG. 15 (a): substrate / mask plate contacting step, step ST3 in FIG. 12). As a result, the pattern hole ph of the mask plate 13 and the electrode 3 on the substrate 2 are aligned in the vertical direction.

  After the substrate 2 is brought into contact with the mask plate 13, the control device 50 supplies the paste Pst onto the mask plate 13 as necessary (paste supply process; step ST4 in FIG. 12). When supplying the paste Pst, the control device 50 first moves the squeegee base 30 in the Y-axis direction so that the front squeegee 15a is positioned directly above the front clamp member 24. Then, the operation of the syringe moving motor 36 is controlled to drive the syringe moving mechanism 40, the paste supply syringe 14 is moved in the X-axis direction in the area in front of the squeegee base 30, and the paste supply syringe 14 is moved from the retracted position to the axis 41. The paste Pst is supplied from the paste supply syringe 14 onto the mask plate 13 directly below the front squeegee 15a after being rotated 90 degrees around to the paste supply posture. When the paste Pst is supplied, the paste supply syringe 14 is moved in the X-axis direction by the syringe moving mechanism 40 so that the paste Pst is evenly supplied in the width direction of the substrate 2. When the supply of the paste Pst onto the mask plate 13 by the paste supply syringe 14 is finished, the control device 50 drives the syringe moving mechanism 40 to change the paste syringe 14 from the paste supply posture to the retracted posture.

  When the control device 50 brings the substrate 2 into contact with the mask plate 13 and supplies the paste Pst onto the mask plate 13 as necessary, the control device 50 moves the squeegee base 30 back and forth in the Y-axis direction, The paste Pst is filled into the pattern holes ph of the mask pattern MP (paste filling step, step ST5 in FIG. 12). Specifically, the filling operation of the paste Pst is performed by first lowering the front squeegee 15a and bringing its lower edge into contact with the upper surface of the mask plate 13, and then moving it to the rear of the squeegee base 30 to move the front squeegee 15a. Is slid on the mask plate 13 to scrape the paste Pst to the upper surface region of the rear clamp member 24 (arrow F1 shown in FIG. 15B). When the paste Pst is scraped to the upper surface area of the rear clamp member 24, the movement of the squeegee base 30 is stopped, the front squeegee 15a is raised and separated from the mask plate 13, and the rear squeegee 15b is lowered. The lower edge is brought into contact with the upper surface of the mask plate 13. Then, the squeegee base 30 is moved in the direction opposite to the arrow F1 and the rear squeegee 15b is slid on the mask plate 13 to scrape the paste Pst to the upper surface area of the front clamp member 24 (FIG. 15 ( c) Arrow F2) shown in the figure. As a result, the paste Pst is filled into the pattern holes ph of the mask plate 13.

  When the control device 50 fills the pattern hole ph of the mask plate 13 with the paste Pst, the control device 50 lowers the first elevating table 22a with respect to the base table 21d and separates the mask plate 13 from the substrate 2 (FIG. 16A). ) Arrow D4) shown in the figure. As a result, plate separation is performed, and the paste Pst is printed on the electrode 3 of the substrate 2 (plate separation step, step ST6 in FIG. 12).

  When the printing of the paste Pst on the substrate 2 is completed, the control device 50 operates the clamp member 24 to release the clamp of the substrate 2 (arrow E2 shown in FIG. 16B). Clamp release step, FIG. Step ST7). And the 2nd raising / lowering table 22b is lowered | hung with respect to the 1st raising / lowering table 22a, and the board | substrate 2 is lowered | hung on the positioning conveyor 23 (arrow D5 shown in FIG.16 (c)). Then, the positioning unit 21 in the horizontal plane provided in the substrate positioning unit 12 is operated to adjust the position of the positioning conveyor 23 with respect to the carry-out conveyor 26, and then the positioning conveyor 23 and the carry-out conveyor 26 are operated, so that the substrate on the positioning conveyor 23 is obtained. 2 is delivered to the carry-out conveyor 26 and carried out as it is to the outside of the screen printing machine 1 (substrate carry-out process, step ST8 in FIG. 12).

  After unloading the substrate 2, the control device 50 determines whether there is another substrate 2 to be screen printed (determination step; step ST9 in FIG. 12). As a result, if there is another substrate 2 to be screen-printed, the process returns to step ST1 to carry in and position the substrate 2, and if there is no other substrate 2 to be screen-printed, a series of screen printing steps. Exit.

  In such a screen printing process, the control device 50 uses the detection information from the paste height detection sensor 58 when the paste Pst is scraped forward of the mask plate 13 by the rear squeegee 15b in the paste filling process of step ST5. Based on this, it is determined whether or not the height h (FIG. 11 (b)) of the paste Pst in front of the rear squeegee 15b is below a predetermined value H (FIG. 11 (b)). As a result, it is recognized that the height h of the paste Pst is lower than a predetermined value H corresponding to the height of the inspection light L measured from the upper surface of the mask plate 13, and it is necessary to supply the paste Pst. When it is performed, the fact (recognizing that it is necessary to supply the paste Pst) is stored in a storage unit (not shown), and before the next paste filling step (step ST5), the paste supply syringe is stored. 14 is changed from the storage posture to the paste supply posture, and the supply of the paste Pst onto the mask plate 13 (step ST4) is executed. As a result, the additional paste Pst is added to the paste Pst on the front clamp member 24, and the reduced amount of paste Pst is recovered. Further, since the paste Pst is supplied immediately below the front squeegee 15a with the paste Pst scraped forward, even if the paste Pst is supplied while the substrate 2 is being transported, the mask plate 13 The paste Pst does not drop from the pattern hole ph.

  As described above, the screen printer 1 according to the present embodiment is in contact with the upper surface of the substrate 2 and has the mask plate 13 on which the mask pattern MP according to the arrangement of the electrodes 3 on the substrate 2 is formed. Is attached to a squeegee base 30 that reciprocally moves in the horizontal direction above the squeegee, and moves in the horizontal direction together with the squeegee base 30 in contact with the mask plate 13 from above to slide on the mask plate 13. The squeegee 15 that fills the pattern holes ph of the mask pattern MP with the paste Pst that has been scraped on the surface 13, and the vertical plane parallel to the reciprocating direction of the squeegee base 30 from the squeegee base 30 is inclined downward with respect to the horizontal line HL. The nozzle portion 14a at the lower end is attached to the squeegee 1 so as to be swingable around the extending axis 41. A paste supply posture extending obliquely with respect to the vertical line VL in the vertical plane so as to be located immediately below (the front squeegee 15a) and a retracted posture rotated about 90 degrees around the axis 41 from the paste supply posture Provided with paste supply syringe 14 capable of changing the posture between them, and syringe posture changing means (syringe moving mechanism 40 and guide member 44) for swinging paste supply syringe 14 between the paste supply posture and the storage posture It has become.

  In the screen printing machine 1 according to the present embodiment, the paste supply syringe 14 swings around an axis 41 that extends downwardly with respect to the horizontal line HL in a vertical plane parallel to the reciprocating direction of the squeegee base 30 from the squeegee base 30. From the paste supply posture and the paste supply posture, which is attached movably and extends obliquely with respect to the vertical line VL in the vertical plane so that the lower end nozzle portion 14a is positioned directly below the squeegee 15 (front squeegee 15a). Since the posture can be changed between the storage posture rotated about 90 degrees around the axis 41, the paste supply syringe 14 can be easily refilled with the paste Pst into the paste supply syringe 14. Paste even if it is provided in the area in front of the operator OP of the squeegee base 30 as viewed from the working position side. Can be opened to the front region of the squeegee base 30 by the sheet syringe 14 to the storage position, it can be easily performed replacement of the squeegee 15.

  Although the embodiments of the present invention have been described so far, the present invention is not limited to those shown in the above-described embodiments. For example, in the above-described embodiment, the screen printing machine 1 includes the two squeegees 15 (the front squeegee 15a and the rear squeegee 15b). However, this is an example, and only one squeegee 15 is provided. It does not matter.

  In the above-described embodiment, the syringe posture changing means for swinging the paste supply syringe 14 between the paste supply posture and the storage posture is a combination of the syringe moving mechanism 40 and the guide member 44. The syringe posture changing means only needs to have a configuration capable of changing the posture of the paste supply syringe 14 between the paste supply posture and the storage posture, and the configuration is not limited to that shown in the above-described embodiment. Therefore, the paste supply syringe 14 may be directly oscillated by a motor having a drive shaft that coincides with the axis 41. In the above-described embodiment, the paste supply syringe 14 swings between the paste supply posture and the retracted posture by moving in the horizontal direction, but the paste supply syringe 14 has the paste supply posture. It is not an essential requirement for the paste supply syringe 14 to move in the horizontal direction in the process of swinging between the retracted postures.

  A screen printer capable of easily performing both a squeegee replacement operation and a paste replenishment operation in a paste supply syringe.

DESCRIPTION OF SYMBOLS 1 Screen printer 2 Board | substrate 3 Electrode 13 Mask plate 14 Paste supply syringe 14a Nozzle part 15 Squeegee 30 Squeegee base 40 Syringe movement mechanism (syringe attitude | position conversion means)
41 Axis 44 Guide member (syringe posture changing means)
58 Paste height detection sensor
HL horizontal line VL vertical line MP mask pattern ph pattern hole Pst paste OP operator

Claims (1)

A mask plate that is in contact with the upper surface of the substrate and on which a mask pattern according to the arrangement of the electrodes on the substrate is formed
Attached to a squeegee base that reciprocally moves in the horizontal direction above the mask plate, and moves in the horizontal direction together with the squeegee base while in contact with the mask plate from above, it slides on the mask plate. A squeegee that fills the pattern holes of the mask pattern with the paste that has been scraped;
Mounted in a vertical plane parallel to the reciprocating direction of the squeegee base from the squeegee base so as to be swingable about an axis extending downwardly with respect to the horizontal line, and the vertical position so that the lower end nozzle portion is located directly under the squeegee. A squeegee-based operator can change the posture between a paste supply posture that extends obliquely with respect to a vertical line in the plane and a storage posture that swings about 90 degrees around the axis from the paste supply posture. A paste supply syringe provided in a front region as seen from the working position side of
A sensor for detecting the paste on the mask plate;
Syringe posture changing means for swinging the paste supply syringe between the paste supply posture and the storage posture,
When it is determined that the supply of the paste is necessary based on the detection result of the sensor, the paste supply syringe changes from the retracted position to the paste supply position and supplies the paste onto the mask plate. Screen printing machine.

Images