JP4811257B2 - Screen printing apparatus and screen printing method - Google Patents

Description

  The present invention relates to a screen printing apparatus and a screen printing method for printing paste such as cream solder or conductive paste on a work held on a carrier.

In the field of workpiece manufacture, screen printing is widely used as a method for printing paste such as cream solder or conductive paste on a substrate. In the case where the substrate to be printed is a small-sized substrate divided into individual pieces, a plurality of substrates are held on a handling carrier, and a printing operation is performed collectively for the plurality of substrates. As a carrier used in such screen printing, a carrier having a work placement portion for holding a substrate or a work on a rectangular plate-shaped member is often used (see Patent Document 1). In the example shown in this patent document, a work piece is placed by fitting and positioning an individual work piece in a work placement portion provided on a carrier, and vacuuming from a suction hole provided on the bottom surface of the work placement portion. To keep.
JP-A-2005-47124

  There are several types of carriers used for handling workpieces such as substrates and workpieces that are subject to screen printing, depending on the characteristics of the workpiece, and the type of workpiece positioning in the state held by the carrier varies depending on the type of carrier. Yes. For example, when using a workpiece mounting part that is formed with high dimensional accuracy corresponding to the workpiece, even when targeting a workpiece that requires high positioning accuracy, the workpiece is simply fitted on the workpiece mounting part. Sufficient positioning accuracy is ensured only by combining them. On the other hand, when a similar workpiece is held on a carrier having a low dimensional accuracy of the workpiece mounting portion and a so-called “backlash”, a mechanism for positioning the workpiece with the required accuracy is separately required.

  In addition, in the carrier for screen printing, not only the workpiece is positioned in the horizontal direction but also in order to separate the workpiece from the lower surface of the mask plate when separating the plate after squeezing, rather than the adhesion force between the workpiece and the mask plate. It is necessary to hold it up and down with great force. Conventionally, vacuum suction is often used to hold the workpiece in the vertical direction. However, when the vacuum suction method is applied to a small piece of workpiece, vibration and shock during carrier transportation are used. There is a problem that it is difficult to avoid the problem that the workpiece protrudes from the workpiece mounting portion due to the above, and it is difficult to stably hold the workpiece. As described above, in the conventional screen printing, there is a problem that it is difficult to position and stably hold a plurality of workpieces on a carrier with high positioning accuracy when an individual workpiece is targeted.

  Therefore, an object of the present invention is to provide a screen printing apparatus and a screen printing method capable of positioning and stably holding a plurality of workpieces on a carrier with high positioning accuracy.

In the screen printing apparatus of the present invention, a plurality of rectangular workpieces held by a carrier are brought into contact with a mask plate provided with a pattern hole, and the squeegee is slid on the mask plate supplied with the paste. A screen printing apparatus that prints a paste on the workpiece through a pattern hole, the positioning part being disposed below the mask plate for positioning the carrier at a printing position by a screen printing mechanism, and provided in the positioning part A workpiece receiving portion for receiving the workpiece held by the carrier and positioning the workpiece in the horizontal direction and holding the workpiece against the adhesive force with the mask plate at the time of releasing the plate; and The workpiece is carried together with the carrier, and the workpiece is moved from the printing position to the carrier. Each of a plurality of rectangular workpiece mounting portions on which the plurality of workpieces are individually mounted. The two sides of the workpiece when the workpiece placed on the workpiece placing portion is positioned in the horizontal direction by inserting two notches provided between the corners of the square from below. A pair of position reference pins that serve as a reference for the position of the workpiece and two notches provided between the corners facing the one corner point in the workpiece placement portion are inserted from below, and the workpiece placement is performed. A pair of pressing pins that abut against the two sides of the workpiece placed on the part and that are opposed to the two sides and press the workpiece in a diagonal direction, and the pair of position reference pins are provided on the plurality of workpiece placement units. One Position reference pin moving means for collectively moving the workpiece in the diagonal direction and positioning the workpiece at a positioning point for positioning the workpiece in the horizontal direction and a positioning release point for releasing the positioning; and the pair of presses A pin pressing force applying means for applying and releasing the pressing force in the diagonal direction in a batch with respect to the plurality of workpiece mounting portions with respect to the pins; and in each of the plurality of workpiece mounting portions In a state where the pair of position reference pins are positioned at the positioning point, the workpiece is pressed diagonally by the pair of pressing pins and the workpiece is sandwiched between the pair of position reference pins. Thus, the workpiece is positioned in the horizontal direction and held in the vertical direction.

  The screen printing method of the present invention is provided in a positioning portion for positioning a carrier holding a square workpiece at a printing position by a screen printing mechanism, receiving the workpiece held by the carrier and positioning the workpiece in the horizontal direction. Furthermore, a plurality of rectangular workpieces held by a carrier on a mask plate provided with a pattern hole by a screen printing apparatus having a workpiece receiving portion that holds the workpiece against the adhesive force with the mask plate when the plate is released. And printing a paste on the workpiece through the pattern hole by sliding a squeegee on a mask plate to which the paste is supplied, the workpiece receiving portion being used to print the paste. When receiving the base, the carrier is formed with an open bottom. In each of a plurality of rectangular workpiece placement portions on which workpieces are individually placed, a pair of position reference pins are inserted from below into two notches provided with one corner point in the rectangle interposed therebetween. Then, the positioning pin moving step of positioning the pair of position reference pins at a positioning point that serves as a reference for the positions of the two sides of the work when the work placed on the work placing portion is positioned in the horizontal direction. And a pair of pressing pins are inserted from below into two cutout portions provided across the corner point facing the one corner point in the workpiece mounting portion, and the pair of pressing pins Positioning the workpiece in the horizontal direction and holding it in the vertical direction by pressing the workpiece diagonally and sandwiching the workpiece between the pair of position reference pins In the positioning pin moving step, the position reference pin moving means collectively moves the pair of position reference pins with respect to the plurality of workpiece placement portions in the diagonal direction. The positioning reference pin is positioned at the positioning point, and in the positioning / holding step, the pressing force in the diagonal direction is collectively applied to the plurality of workpiece placement portions with respect to the pair of pressing pins by the pin pressing force applying means. Is granted.

According to the present invention, the workpiece placed on the workpiece placing portion is placed on the workpiece placing portion for receiving the workpiece placed on the workpiece placing portion of the carrier and positioning and holding the workpiece in the horizontal direction. A pair of position reference pins that serve as a reference for positions when positioning in the horizontal direction, and a pair of pressing pins that abut against the workpiece and press the workpiece in a diagonal direction, each of the plurality of workpiece mounting portions With the pair of position reference pins positioned at the positioning point, the workpiece is pressed diagonally by the pair of pressing pins, and the workpiece is sandwiched between the pair of position reference pins, and the workpiece is horizontally oriented. Positioning and holding in the vertical direction allows multiple workpieces to be positioned and stably held on the carrier with high positioning accuracy without using vacuum suction. Can.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 is a side view of a screen printing apparatus according to an embodiment of the present invention, FIG. 2 is a front view of the screen printing apparatus according to an embodiment of the present invention, and FIG. 3 is a screen printing apparatus according to an embodiment of the present invention. FIG. 4 (a) is a perspective view of a workpiece lowering portion in a screen printing apparatus according to an embodiment of the present invention, and FIG. 4 (b) is an embodiment of the present invention. FIG. 5A is a perspective view showing a carrier receiving state in the screen printing apparatus according to the embodiment of the present invention, and FIG. 5B is one view of the present invention. FIG. 6 is an exploded perspective view of a workpiece receiving portion in the screen printing apparatus according to the embodiment of the present invention, and FIG. 7 is an embodiment of the present invention. Form of screen printing FIG. 8 is a view showing a pin pressing force applying means provided in the workpiece receiving portion in the screen printing apparatus according to the embodiment of the present invention. FIG. 9 is an explanatory diagram of a pressing pin urging mechanism provided in a workpiece lowering portion in a screen printing apparatus according to an embodiment of the present invention, and FIGS. 10, 11, and 12 illustrate an embodiment of the present invention. It is process explanatory drawing of this screen printing method.

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

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

  A vertical frame 5e is erected on the base plate 5a, and two print conveyance rails 8a constituting the conveyance mechanism 8 are held at an upper end portion of the vertical frame 5e. The print conveyance rails 8a are arranged in the conveyance direction (X direction--the direction perpendicular to the paper surface in FIG. 1), and a plurality of individual substrates 10 that are workpieces to be printed are placed by these print conveyance rails 8a. The both ends of the carrier 9 are supported and conveyed. By driving the first Z-axis table 5, the carrier 9 held by the print transport rail 8a can be lifted and lowered with respect to the screen printing mechanism described later together with the print transport rail 8a.

  As shown in FIG. 2, a carry-in rail 8b and a carry-out rail 8c that constitute the conveyance mechanism 8 together with the print conveyance rail 8a are connected to the upstream side (left side in FIG. 2) and the downstream side of the print conveyance rail 8a, respectively. . The carrier 9 carried in from the upstream side via the carry-in rail 8b is transferred to the printing conveyance rail 8a and positioned by the positioning unit 1 at a printing position by a screen printing mechanism to be described later, and the carrier after printing on the substrate 10 is performed. 9 is carried out downstream by the carry-out rail 8c. The transport mechanism 8 serves as carrier transport means for carrying the substrate 10 together with the carrier 9 to the printing position and carrying the substrate 10 together with the carrier 9 from the printing position.

  The configuration of the second Z-axis table 6 will be described. A horizontal base plate 6a is disposed between the print conveyance rail 8a and the base plate 5a so as to be movable up and down along a lifting guide mechanism (not shown). The base plate 6a is moved up and down by a Z-axis lifting mechanism configured to rotationally drive a plurality of feed screws 6c through a belt 6d by a motor 6b. On the upper surface of the base plate 6a, there is provided a substrate receiving portion 7 which is a workpiece receiving portion having a plurality of receiving pins 7a (see FIG. 6). By driving the second Z-axis table 6, the substrate receiving part 7 moves up and down with respect to the carrier 9 held by the print transport rail 8 a. The second Z-axis table 6 is an elevating unit that elevates and lowers the substrate receiving part 7 relative to the print transport rail 8a.

  The substrate receiving portion 7 receives the substrate 10 held by the carrier 9 as will be described later, positions the substrate 10 in the horizontal direction, and further forms a mask plate that constitutes a screen printing mechanism when separating the plate after printing. 12 has a function of holding the substrate 10 in the up-down direction against the adhesion with the substrate 12. In the present embodiment, as a mechanism for holding the substrate 10 in the vertical direction, vacuum suction with unstable holding force is not used, and even when a small-sized substrate 10 is targeted, the substrate 10 can be reliably held. Is possible.

  Next, the screen printing mechanism disposed above the positioning unit 1 will be described. 1 and 2, a mask plate 12 is extended on the mask frame 11, and the mask plate 12 is provided with a pattern hole 12a corresponding to a printing target. A squeegee head 13 is disposed on the mask plate 12. The squeegee head 13 has a structure in which a squeegee raising / lowering mechanism 15 for raising and lowering the squeegee 16 is disposed on a horizontal plate 14. As shown in FIG. 2, both ends of the plate 14 are arranged on a vertical frame 20. The mechanism is supported so as to be slidable in the Y direction. The plate 14 is horizontally moved in the Y direction by squeegee moving means comprising a nut 19, a feed screw 18 and a rotary drive motor 17. Further, by driving the squeegee lifting mechanism 15, the squeegee 16 moves up and down and comes into contact with the upper surface of the mask plate 12.

  A screen printing operation will be described. First, when the carrier 9 on which the substrate 10 is placed on the printing transport rail 8 a is carried in, the second Z-axis table 6 is driven to raise the substrate receiving portion 7, and the substrate 10 placed on the carrier 9. Underside the underside of In this state, the positioning unit 1 is driven to align the substrate 10 with the mask plate 12. Thereafter, the first Z-axis table 5 is driven to raise the carrier 9 together with the print conveyance rail 8a, and the plurality of substrates 10 held by the carrier 9 are brought into contact with the lower surface of the mask plate 12. Thereby, the horizontal position of the board | substrate 10 is fixed in the squeegeeing by the squeegee unit 16. In this state, the squeegee 16 is slid on the mask plate 12 to which the cream solder as paste is supplied, whereby the cream solder is printed on the substrate 10 through the pattern holes 12a.

  Next, the substrate 10 to be printed and the carrier 9 used for handling the substrate 10 will be described with reference to FIG. As shown in FIG. 3A, the carrier 9 has a shape that can be transported by the transport mechanism 8 by bending both ends of a rectangular metal plate downward. The carrier 9 is provided with a plurality of workpiece placement portions 9a for individually placing the substrates 10 in a predetermined arrangement (in this case, a 2 × 5 lattice arrangement). The substrate 10 is a small-sized square (here, square) individual substrate used for manufacturing a semiconductor package such as a BGA, and is formed on the carrier 9 in order to collectively print a plurality of substrates 10. Are handled in a state of being individually placed on the plurality of workpiece placement portions 9a.

As shown in FIG. 3B, the workpiece mounting portion 9a is provided in a square shape corresponding to the planar shape of the substrate 10. In order to receive the lower surface of the substrate 10 by the substrate receiving portion 7, the bottom surface is The opening 9b is formed in a shape having an opening. A work supporting surface 9c for supporting the lower surface of the substrate 10 is provided at the edge of the opening 9b, and two corner points (first corner point P1, A pair of notches 9d are provided through the carrier 9 with the second corner point P2) interposed therebetween.

  As will be described later, the notch portion 9d has a position reference pin 31 and a pressing pin 33 (see FIG. 4) for positioning the substrate 10 in the horizontal direction in the workpiece placement portion 9a and holding the substrate 10 in the vertical direction. It is provided in order to pass through. In the present embodiment, the substrate 10 placed on each workpiece placement portion 9 a of the carrier 9 is positioned and held by being sandwiched between the position reference pins 31 and the pressing pins 33.

  Next, with reference to FIGS. 4 to 9, the structure of the substrate receiving portion 7 for receiving the carrier 9 on which the substrate 10 is placed will be described. As shown in FIG. 4, the substrate receiving portion 7 is a position reference pin in which a position reference pin 31 serving as a reference for positioning the substrate 10 is erected corresponding to the arrangement of the work placement portion 9 a on the carrier 9. A holding plate 30 is provided. Further, a lower receiving surface 7 a that abuts on the lower surface of the substrate 10 placed on the carrier 9 and is received by the position reference pin holding plate 30 is provided on the carrier 9. It is provided corresponding to the arrangement.

  The position reference pins 31 are provided in a pair with one corner point of the lower receiving surface 7a (a position corresponding to the first corner point P1 in the workpiece mounting portion 9a) interposed therebetween. In each of the workpiece mounting portions 9a, the position reference pin 31 is inserted from below two notches 9d provided with the first corner point P1 interposed therebetween. Then, by positioning the position reference pin holding plate 30, the position reference pin 31 is used as a reference for the positions of the two sides of the substrate 10 when the substrate 10 placed on the workpiece placement portion 9 a is positioned in the horizontal direction. Become.

  A pressing pin holding portion 32 is disposed at a corner point (corresponding to the second corner point P2 in the workpiece mounting portion 9a) opposite to the corner point where the position reference pin 31 is provided on the lower receiving surface 7a. Yes. The pressing pin holding portion 32 is provided with a pair of pressing pins 33 for pressing the substrate 10 diagonally and sandwiching the substrate 10 between the position reference pins 31. The pressing pin 33 is inserted through the two notches 9d provided across the second corner point P2 in the workpiece mounting portion 9a from below. And it drives by the drive mechanism mentioned later, abuts on two sides opposite to the two sides of substrate 10 laid in the work laying part 9a, and presses this substrate 10 in the diagonal direction.

  FIG. 5 shows a state in which the carrier 9 on which the substrate 10 is placed on each workpiece placement portion 9 a is received by the substrate receiving portion 7. In this state, in each workpiece mounting portion 9a, the position reference pin 31 and the pressing pin 33 are inserted through the notch 9d corresponding to the respective positions from below (see FIG. 4B), and face the substrate 10. It is in a state where it can be sandwiched from the diagonal direction.

  Next, the overall configuration of the substrate receiving portion 7 that positions and holds the plurality of substrates 10 will be described with reference to FIG. As shown in FIG. 6, the substrate receiving portion 7 includes a position reference pin holding plate 30 provided with a receiving surface 7 a and position reference pins 31, and a pressing pin 33 of the pressing pin holding portion 32 by a locking pin 36. The driving pin 40 is stacked vertically so that the locking pin holding plate 35, the position reference pin holding plate 30, and the mechanism element for driving the locking pin holding plate 35 are integrally arranged. ing.

In addition, the drive base 40 is provided with a pressing pin holding portion 32 having a pair of pressing pins 33 corresponding to the arrangement of the work placement portion 9 a on the carrier 9. By laminating the pin holding plate 35 and the position reference pin holding plate 30, the pressing pin holding portion 32 is positioned at one corner portion of the lower receiving surface 7a. The opening 35a provided in the locking pin holding plate 35 and the opening 30a provided in the position reference pin holding plate 30 are provided to prevent positional interference with the pressing pin holding part 32 in this stacked state. It is what was done.

  The position reference pin holding plate moving means for moving the position reference pin holding plate 30 will be described with reference to FIG. In FIG. 7A, only the mechanism elements on the drive plate 40 shown in FIG. 6 related to the movement of the position reference pin holding plate 30 are shown. In the center of the drive base 40, a cylinder 41 is arranged so that its operation direction is aligned with the diagonal direction (arrow a1) of the workpiece mounting portion 9a, and the rod 41a holds a position reference pin via a coupling member (not shown). It is coupled to the lower surface of the plate 30. In the arrangement of the cylinder 41, by providing an opening 35b (see FIG. 8) at the center of the locking pin holding plate 35, positional interference with the locking pin holding plate 35 is prevented.

  In addition, two guide mechanisms 42 are arranged at both ends in the longitudinal direction of the drive base 40 so that the slide direction is aligned with the diagonal direction of the workpiece mounting portion 9a in the same manner as the operation direction of the cylinder 41. The slide portion is coupled to the lower surface of the position reference pin holding plate 30. Therefore, by driving the cylinder 41, the position reference pin holding plate 30 reciprocates in the above-described diagonal direction (arrow a2), whereby the position reference pin 31 erected on the position reference pin holding plate 30 is As shown in (b), the workpiece is moved in a diagonal direction (arrow a3) in a diagonal direction. That is, the cylinder 41 and the guide mechanism 42 serve as a first plate moving mechanism that reciprocates the position reference pin holding plate 30 in the diagonal direction.

  As shown in FIG. 7A, the position reference pin holding plate 30 is provided with stopper members 34X and 34Y extending downward corresponding to the X direction and the Y direction, respectively. The stopper contact surface 43X and the contact surface 43Y are set corresponding to the positions of the members 34X and 34Y. When the cylinder 41 is operated in the direction in which the rod 41a discharges, the stopper members 34X and 34Y come into contact with the stopper contact surfaces 43X and 43Y, respectively, so that the relative position of the position reference pin holding plate 30 with respect to the drive base 40 is changed. It is decided. Stopper bolts for adjusting the contact position are provided on the stopper members 34X and 34Y or the stopper contact surfaces 43X and 43Y so that the stop position can be finely adjusted.

  By setting this stop position to a predetermined position, the position reference pin 31 can be positioned at a positioning point for positioning the substrate 10 at the normal position in the workpiece mounting portion 9a. Then, by operating the cylinder 41 in the direction in which the rod 41a is retracted, the position reference pin holding plate 30 moves in the direction opposite to the positioning operation described above, whereby the position reference pin 31 releases the positioning for releasing the positioning. Move to a point. That is, the stopper members 34X and 34Y and the stopper contact surfaces 43X and 43Y serve as a stopper mechanism that causes the moving end position of the first plate moving mechanism to correspond to the positioning point described above.

  That is, the substrate receiving unit 7 moves the pair of position reference pins 31 corresponding to each workpiece placement unit 9a in a diagonal direction of the workpiece placement unit 9a in a lump for the plurality of workpiece placement units 9a. Position reference pin moving means for positioning at a positioning point for positioning the substrate 10 in the horizontal direction and a positioning release point for releasing the positioning is provided. The position reference pin moving means includes the position reference pin holding plate 30, the first plate moving mechanism and the stopper mechanism described above.

  Next, pin pressing force applying means for applying a pressing force to the pressing pin 33 will be described with reference to FIGS. In FIG. 8A, only the mechanism elements on the drive plate 40 shown in FIG. 6 related to the movement of the locking pin holding plate 35 are shown. As shown in FIGS. 8A and 8B, the drive base 40 has two cylinders 45 arranged in the diagonal direction (arrow b1) of the workpiece mounting portion 9a so that the operation direction is aligned with the rod 45a. Is coupled to the lower surface of the locking pin holding plate 35 via a coupling member (not shown). In the arrangement of the cylinder 41, the upper surface of the drive base 40 is scraped to prevent positional interference with the locking pin holding plate 35 in the vertical direction.

  In addition, on the upper surface of the drive base 40, two guide mechanisms 44 are arranged in parallel with the cylinder 45 so that the sliding direction is aligned with the diagonal direction of the workpiece mounting portion 9a in the same manner as the operation direction of the cylinder 45. The slide portion of the guide mechanism 44 is coupled to the lower surface of the locking pin holding plate 35. Therefore, by driving the cylinder 45, the locking pin holding plate 35 reciprocates in the diagonal direction (arrow b2). That is, the cylinder 45 and the guide mechanism 44 serve as a second plate moving mechanism that reciprocally moves the locking pin holding plate 35 in the diagonal direction.

  The drive base 40 is provided with a plurality of pressing pin holding portions 32 that respectively hold a pair of pressing pins 33 corresponding to the arrangement of the plurality of workpiece placement portions 9 a in the carrier 9. Then, by the reciprocating movement of the locking pin holding plate 35 described above, the pressing force is applied to the pressing pin 33 in the diagonal direction and the pressing force is released. Here, the detailed structure of the pressing pin holding part 32 will be described with reference to FIG.

  As shown in FIG. 9A, the pressing pin holding portion 32 has a structure in which the pressing pin 33 is vertically inserted into two pin moving grooves 32b provided in the U-shaped pin holding member 32a. The pressing pin 33 is capable of horizontal reciprocation along the longitudinal direction of the pin moving groove 32b. The pressing pin holding portion 32 is held by the drive base 40 via the holding posts 32c in a state where the longitudinal direction of the pin moving groove 32b, that is, the moving direction of the pressing pin 33 is aligned with the diagonal direction of the work placing portion 9a. Yes.

  The base portion 33a coupled to the lower portion of the pressing pin 33 is urged in the horizontal direction (arrow c1 direction) by the spring member 37. A locking hole 33b is provided on the lower surface of the base portion 33a, and the locking pin 36 that fits into the locking hole 33b corresponds to the arrangement of the plurality of workpiece mounting portions 9a in the carrier 9 in the locking pin holding plate 35. It is erected. In a state where the locking pin holding plate 35 is overlaid on the upper surface of the drive base 40 and the pressing pin holding portion 32 is positioned above the opening 35a, the locking pin holding plate 35 is placed on the locking pin holding plate 35 as shown in FIG. The provided locking pin 36 is fitted into the locking hole 33b. By reciprocating the locking pin holding plate 35 in the diagonal direction in the workpiece mounting portion 9a, the driving force is transmitted to the base portion 33a via the locking pin 36 fitted in the locking hole 33b, thereby the pressing pin. 33 reciprocates along the pin moving groove 32b in the pressing pin holding portion 32.

  The outer dimension of the locking pin 36 and the inner diameter dimension of the locking hole 33b are set to have so-called “play”. As a result, in the case where a plurality of workpiece placement portions 9a are targeted, even when the positions of the locking holes 33b and the locking pins 36 of each workpiece placement portion 9a vary, this variation error is reduced. So that the locking pin 36 can be fitted into the locking hole 33b without any trouble.

In the movement of the pressing pin 33 by the locking pin holding plate 35, the rod 45a of the cylinder 45 is protruded, and the locking pin holding plate 35 is moved in the direction of the arrow b3 as shown in FIG. The pin 33 moves in the direction of the arrow c2 against the urging force of the spring member 37 together with the base portion 33a. Then, by causing the cylinder 45 to return so that the rod 45a is inserted, the locking pin holding plate 35 moves in the arrow b4 direction, and the pressing pin 33 moves in the arrow c1 direction. In the return operation of the cylinder 45, the cylinder 45 does not have a driving force, and the pressing pin 33 moves while being pressed in the direction of the arrow c1 by the urging force of the spring member 37.

  That is, by moving the locking pin holding plate 35 in the direction of the arrow b4 shown in FIG. 9B, the pressing force is applied to the substrate 10 placed on the workpiece placing portion 9a by the biasing force of the spring member 37. Then, the pressing force to the substrate 10 is released by moving the locking pin holding plate 35 in the direction of the arrow b3. The application / release of the pressing force is performed collectively for the plurality of workpiece mounting portions 9a by reciprocating the locking pin holding plate 35.

  Accordingly, the substrate receiving portion 7 collectively applies a pressing force in the diagonal direction to the pair of pressing pins 33 held by the pressing pin holding portion 32 and releases the pressing force. It has the structure which has the pin pressing force provision means to perform. The spring members 37 serve as pin urging means for applying a pressing force to the substrate 10 by urging each pressing pin 33 diagonally in each pressing pin holding portion 32. The spring force of the spring member 37 holds the substrate 10 against the holding force in the vertical direction required for the target substrate 10, that is, the adhesion force between the substrate 10 and the mask plate 12 during plate separation after printing. It is chosen to be strong enough.

  Then, the guide mechanism 44 and the cylinder 45 disposed on the locking pin holding plate 35 and the drive base 40 move the pressing pins 33 that reciprocate in the diagonal direction all the pressing pins 33 held by the pressing pin holding portion 33. The pressing force is applied to the substrate 10 by moving the pressing pins 33 against the urging force of the spring member 37 by the pressing pin moving means. Therefore, the cylinder 45 is of a size that can generate a driving force larger than the urging force of the plurality of spring members 37.

  With the above configuration, in each of the plurality of workpiece placement portions 9a of the carrier 9, the substrate 10 is placed diagonally by the pair of pressing pins 33 in a state where the pair of position reference pins 31 are positioned at the positioning points described above. The substrate 10 is sandwiched between the pair of position reference pins 33 by being pressed, and the substrate 10 can be positioned in the horizontal direction and held in the vertical direction.

  Next, a plurality of square substrates 10 held by the carrier 9 are brought into contact with the mask plate 12 provided with the pattern holes 12a by the screen printing apparatus having the substrate receiving portion 7 having the above-described configuration, and the paste is supplied. A screen printing method for printing paste on the substrate 10 through the pattern holes 12a by sliding the squeegee 16 on the mask plate 12 will be described with reference to FIGS.

  FIG. 10A shows a state in which the carrier 9 on which the plurality of substrates 10 are placed on each workpiece placement portion 9 a is conveyed to the print conveyance rail 8 a and is positioned at the printing position below the mask plate 12. Yes. Thereby, as shown to Fig.12 (a), the position reference | standard pin 31 and the press pin 33 are aligned with respect to the workpiece | work mounting part 9a. Thereafter, as shown in FIG. 10 (b), the second Z-axis table 6 is driven to raise the substrate receiving portion 7 relative to the carrier 9. As a result, as shown in FIG. 12 (b), the lower surface of the substrate 10 is received by the lower receiving surface 7a, and the position reference pin 31 and the pressing pin 33 are raised, so that the cutout portion of the workpiece mounting portion 9a. 9d is inserted from below and the diagonal position of the board | substrate 10 mounted in the workpiece | work mounting part 9a will be pinched | interposed.

  Next, the cylinder 41 is driven to move the position reference pin holding plate 30 in the diagonal direction, and the pair of position reference pins 31 are positioned at the positioning points for positioning the substrate 10 as shown in FIG. (See arrows d1 and d2.) That is, in each of the plurality of rectangular workpiece placement portions 9a on which the plurality of substrates 10 are individually placed, two notches provided with one corner point (first corner point P1) in the square sandwiched therebetween. A pair of position reference pins 33 is inserted into the portion 9d from below, and the pair of position reference pins 33 is positioned in the workpiece mounting portion 9a when the substrate 10 placed in the horizontal direction is positioned in the horizontal direction. 10 is positioned at a positioning point serving as a reference for the positions of the two sides (positioning pin moving step). In this positioning pin moving step, the above-described position reference pin moving means collectively moves the pair of position reference pins 31 in the diagonal direction with respect to the plurality of workpiece mounting portions 9a, and these positioning reference pins 31 are moved. Is positioned at the positioning point.

  Next, the cylinder 45 is driven to move the locking pin holding plate 35 in the pressing force application direction (arrow d2). As a result, as shown in FIG. 12D, the pressing pin 33 is moved in the diagonal direction (arrow d <b> 3) and brought into contact with the two sides of the substrate 10, and the substrate 10 is sandwiched between the position reference pins 31. That is, a pair of presses are applied to the two notches 9d provided across the corner point (second corner point P2) opposite to the one corner point (first corner point P1) in the workpiece mounting portion 9a. By inserting the pins 33 from below, pressing the substrate 10 diagonally by the pair of pressing pins 33 and sandwiching the substrate 10 between the pair of position reference pins 31, each workpiece mounting portion 9 a The substrate 10 is positioned at a normal position in the horizontal direction and held in the vertical direction (positioning / holding step). In this positioning / holding step, the above-described pin pressing force applying means collectively applies a pressing force in a diagonal direction to the pair of pressing pins 33 with respect to the plurality of workpiece mounting portions 9a. .

  Thereafter, as shown in FIG. 12E, the substrate receiving portion 7 is further raised (arrow d4), and the substrate 10 is lifted from the carrier 9 by the lower receiving surface 7a. In addition, you may perform the operation | movement which lifts the board | substrate 10 from the carrier 9 before the above-mentioned positioning and holding process. FIG. 11A shows a state where the substrate 10 thus placed on the carrier 9 is held by the substrate receiving portion 7. Thereafter, the first Z-axis table 5 is driven to raise the base plate 5a (arrow d5), whereby the substrate receiving portion 7 is lifted together with the carrier 9 as shown in FIG. Comes into contact with the lower surface of the mask plate 12. In this state, by performing squeegeeing by sliding the squeegee 16 on the mask plate 12, the cream solder is collectively printed on the plurality of substrates 10 through the pattern holes 12a.

  In the receiving of the substrate 10 by the substrate receiving portion 7 in this screen printing, the substrate 10 is sandwiched from the diagonal direction by the position reference pin 31 and the pressing pin 33, thereby positioning the substrate 10 in the horizontal direction and holding it in the vertical direction. I try to do it at the same time. As a result, even when the dimensional accuracy of the workpiece placement portion as a carrier is low and so-called “backlash” occurs between the workpiece placement portion 10 and the placed substrate 10, the substrate 10 is correctly positioned at the normal position. Therefore, during the squeezing operation, the substrate 10 is accurately aligned with the mask plate 12, and good printing without misalignment can be performed.

  In the plate separation operation after printing, the substrate 10 is sandwiched between the position reference pins 31 and the pressing pins 33 and is held with a sufficient holding force with respect to the force in the vertical direction. Good plate separation can be performed against the force adhering to the lower surface of 12. That is, since the substrate 10 is securely held by a mechanical biasing means such as a spring with a sufficient holding force, the holding force fluctuates due to a vacuum leak or the like that tends to occur when holding by the vacuum suction method is used. And a stable holding state is ensured.

  INDUSTRIAL APPLICABILITY The screen printing apparatus and the screen printing method of the present invention have an effect that a plurality of workpieces can be positioned and stably held on a carrier with high positioning accuracy, and cream solder is applied to individual workpieces held on the carrier. It is useful in the field of screen printing for printing paste such as conductive paste.

The side view of the screen printing apparatus of one embodiment of this invention 1 is a front view of a screen printing apparatus according to an embodiment of the present invention. Structure explanatory drawing of the carrier used for the screen printing apparatus of one embodiment of this invention (A) Perspective view of workpiece support part in screen printing apparatus of one embodiment of the present invention (b) Plan view of workpiece support part of screen printing apparatus of one embodiment of the present invention (A) The perspective view which shows the carrier receiving state in the screen printing apparatus of one embodiment of this invention (b) The top view which shows the carrier receiving state in the screen printing apparatus of one embodiment of this invention 1 is an exploded perspective view of a workpiece receiving portion in a screen printing apparatus according to an embodiment of the present invention. The figure which shows the position reference | standard pin moving means provided in the workpiece receiving part in the screen printing apparatus of one embodiment of this invention. The figure which shows the pin pressing force provision means provided in the workpiece receiving part in the screen printing apparatus of one embodiment of this invention. Explanatory drawing of the urging mechanism of the press pin provided in the workpiece receiving part in the screen printing apparatus of one embodiment of this invention Process explanatory drawing of the screen printing method of one embodiment of this invention Process explanatory drawing of the screen printing method of one embodiment of this invention Process explanatory drawing of the screen printing method of one embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Positioning part 7 Substrate receiving part 8 Conveyance mechanism 9 Carrier 9a Work place part 9d Notch part 10 Substrate 12 Mask plate 12a Pattern hole 16 Squeegee 30 Position reference pin holding plate 31 Position reference pin 32 Press pin holding part 33 Press pin 35 Locking Pin Holding Plate 36 Locking Pin 40 Drive Base 41 Cylinder 45 Cylinder

Claims (5)

A plurality of rectangular workpieces held by a carrier are brought into contact with a mask plate provided with a pattern hole, and a squeegee is slid on the mask plate supplied with paste, thereby allowing the workpiece to pass through the pattern hole. A screen printing device for printing a paste,
A positioning portion disposed below the mask plate for positioning the carrier at a printing position by a screen printing mechanism, and receiving a workpiece provided on the positioning portion and held by the carrier and positioning the workpiece in the horizontal direction. Furthermore, when the plate is released, a workpiece receiving portion that holds the workpiece against the adhesion with the mask plate, and the workpiece is carried into the printing position together with the carrier, and the workpiece is carried out from the printing position together with the carrier. Carrier conveying means for
The workpiece support part is
In each of a plurality of rectangular workpiece mounting portions formed by opening the bottom surface of the carrier and mounting the plurality of workpieces individually, two notches provided with one corner point in the rectangle interposed therebetween A pair of position reference pins that serve as a reference for the positions of the two sides of the workpiece when the workpiece placed on the workpiece placement portion is positioned in the horizontal direction, and the workpiece placement portion Then, the two notches provided between the corner points opposite to the one corner point are inserted from below, and the two sides of the workpiece placed on the workpiece placement portion are opposed to the two sides. A pair of pressing pins that contact and press this workpiece in the diagonal direction;
A positioning point for positioning the workpiece in the horizontal direction and a positioning release point for releasing the positioning by collectively moving the pair of position reference pins in the diagonal direction with respect to the plurality of workpiece placement portions; Position reference pin moving means to be positioned at the same time, and pin pressing force applying means for collectively applying and releasing the pressing force in the diagonal direction with respect to the pair of pressing pins with respect to the plurality of work placement portions And
In each of the plurality of workpiece mounting portions, the pair of position reference pins are pressed diagonally with the pair of pressing pins while the pair of position reference pins are positioned at the positioning points. A screen printing apparatus, wherein the workpiece is positioned in a horizontal direction and held in a vertical direction by sandwiching the workpiece with a reference pin.   The position reference pin moving means includes: a position reference pin holding plate in which the position reference pin is erected corresponding to the arrangement of the plurality of workpiece mounting portions in the carrier; and the position reference pin holding plate is placed in the diagonal direction. The screen printing apparatus according to claim 1, further comprising: a first plate moving mechanism that reciprocally moves the first plate moving mechanism; and a stopper mechanism that associates a moving end position of the first plate moving mechanism with the positioning point.   The pin pressing force applying means is provided corresponding to the arrangement of the plurality of workpiece mounting portions on the carrier, and holds the pair of pressing pins. Pin urging means for applying the pressing force by urging the pins in the diagonal direction, and pressing pin moving means for reciprocally moving the respective pressing pins held by the pressing pin holding portion in the diagonal direction. 2. The screen printing apparatus according to claim 1, wherein the pressing force is released by moving each pressing pin against the biasing force by the pressing pin moving means.   The pressing pin moving means has a locking pin holding in which a locking pin that fits into a locking hole provided in a base portion of the pressing pin is erected corresponding to the arrangement of the plurality of workpiece placement portions in the carrier 4. The screen printing apparatus according to claim 3, further comprising a plate and a second plate moving mechanism for reciprocally moving the locking pin holding plate in the diagonal direction. A carrier for holding a square workpiece is provided in a positioning portion for positioning the carrier at a printing position by a screen printing mechanism, and receives the workpiece held by the carrier, and positions the workpiece in the horizontal direction, and further when the plate is separated from the mask plate Paste is supplied by bringing a plurality of square workpieces held by a carrier into contact with a mask plate provided with pattern holes by a screen printing device equipped with a workpiece receiving part that holds the workpiece against the adhesion force of A screen printing method for printing a paste on the workpiece through the pattern hole by sliding a squeegee on the mask plate,
When receiving the workpiece by the workpiece receiving portion,
In each of a plurality of rectangular workpiece mounting portions formed by opening the bottom surface of the carrier and mounting the plurality of workpieces individually, two notches provided with one corner point in the rectangle interposed therebetween A pair of position reference pins are inserted into the part from below, and the positions of the two sides of the work when the pair of position reference pins are positioned in the horizontal direction on the work placed on the work placing part. A positioning pin moving step to be positioned at a positioning point serving as a reference of
A pair of pressing pins are inserted from below into two cutout portions provided across the corner point facing the one corner point in the workpiece mounting portion, and the workpiece is moved by the pair of pressing pins. A positioning / holding step of positioning the work in the horizontal direction and holding it in the vertical direction by pressing the work in a diagonal direction and sandwiching the work between the pair of position reference pins.
In the positioning pin moving step, the pair of position reference pins are collectively moved in the diagonal direction with respect to the plurality of workpiece placement portions by the position reference pin moving means, and these positioning reference pins are set to the positioning points. Position
In the positioning / holding step, a screen pressing method is characterized in that the pressing force in the diagonal direction is collectively applied to the pair of pressing pins by the pin pressing force applying means with respect to the pair of pressing pins. .

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