JP5494402B2 - Screen printing machine and screen printing method - Google Patents

Description

  The present invention relates to a screen printing machine and a screen printing method for transferring a paste to an electrode on a substrate through an opening of a mask.

  A screen printing machine that prints paste such as solder paste on a substrate raises the substrate in a state where the substrate is clamped by a mask provided with a plurality of openings according to the arrangement of electrodes on the substrate and a pair of clamp members. A substrate holding / moving means for bringing the upper surface of the substrate and the pair of clamp members into contact with the lower surface of the mask; a squeegee base that is moved in the horizontal plane above the mask; and an actuator provided on the squeegee base. The squeegee that is lowered with respect to the squeegee base is placed on the clamp member (on the clamp member that is in contact with the mask). ), Move the squeegee base in the horizontal plane direction, and paste the paste supplied on the mask into the squeegee. By Therefore the scrape, so as to transfer the paste electrode through the opening of the mask (e.g., Patent Document 1).

JP 2008-49669 A

  In such a screen printing machine, the squeegee can be removably attached to a squeegee holder that is moved up and down below the squeegee base by an actuator so that the size of the squeegee can be changed according to the size of the mask. It has become. However, if the operator forgets to attach the squeegee to the squeegee holder, the screen printing operation may be started without the squeegee being attached to the squeegee holder, thereby reducing the productivity of the substrate. There was a fear.

  Accordingly, an object of the present invention is to provide a screen printing machine and a screen printing method capable of preventing screen printing from being started in a state where no squeegee is attached to the squeegee holder.

  The screen printing machine according to claim 1, wherein the substrate is lifted in a state where the substrate is clamped by a mask provided with a plurality of openings according to the arrangement of electrodes on the substrate and a pair of clamp members, Substrate holding and moving means for bringing the upper surface of the substrate and the pair of clamp members into contact with the lower surface of the mask so that the electrode and the opening of the mask coincide with each other, a squeegee base moved in the horizontal plane above the mask, and a squeegee base A squeegee holder that is moved up and down below the squeegee base by an actuator provided on the squeegee, a squeegee that is detachably attached to the squeegee holder, and the squeegee holder that abuts against a clamp member that contacts the mask. A holder position detecting means for detecting whether or not the actuator is located at the contact position; A squeegee lowering control means for lowering the squeegee holder when the squeegee holder is moved down by performing dynamic control and the holder position detecting means detects that the squeegee holder is located at the contact position; After a lapse of a predetermined time from when the squeegee is stopped, if the holder position detecting means detects that the squeegee holder is located at the contact position, the squeegee base is moved in the horizontal plane to move the mask. After the predetermined time has elapsed after the paste is transferred to the electrode on the substrate through the opening and the descent of the squeegee holder is stopped, the squeegee holder is positioned at the contact position by the holder position detecting means. If it is detected that no squeegee is attached to the squeegee holder, a notification is made that the squeegee is not attached to the squeegee holder. And means.

  The screen printing method according to claim 2, wherein the substrate is lifted in a state where the substrate is clamped by a mask provided with a plurality of openings according to the arrangement of the electrodes on the substrate and a pair of clamp members, Substrate holding and moving means for bringing the upper surface of the substrate and the pair of clamp members into contact with the lower surface of the mask so that the electrode and the opening of the mask coincide with each other, a squeegee base moved in the horizontal plane above the mask, and a squeegee base A squeegee holder that is moved up and down below the squeegee base by an actuator provided on the squeegee, a squeegee that is detachably attached to the squeegee holder, and the squeegee holder that abuts against a clamp member that contacts the mask. A screen mark provided with holder position detecting means for detecting whether or not it is located at the contact position A screen printing method using a printing machine, wherein the actuator is controlled to lower the squeegee holder, and the squeegee holder is lowered when the holder position detecting means detects that the squeegee holder is located at the contact position. And a step of stopping the squeegee base when the squeegee holder is located at the abutting position after the predetermined time has elapsed after stopping the descent of the squeegee holder. A process of transferring the paste to the electrode on the substrate through the opening of the mask by moving inward, and after the predetermined time has elapsed after stopping the descent of the squeegee holder, the holder position detecting means uses the squeegee A squeegee is attached to the squeegee holder when it is detected that the holder is not located at the contact position. Which includes a step of performing a notification to the effect not.

  In the present invention, the descent of the squeegee holder is stopped when it is detected that the squeegee holder being lowered is positioned at the contact position, but after a predetermined time has elapsed, the squeegee holder is positioned at the contact position. If it is detected that no squeegee is attached, the squeegee holder is notified that the squeegee is not attached. For this reason, it is possible to prevent screen printing from being started in a state where the squeegee is not attached to the squeegee holder, and it is possible to prevent a reduction in substrate productivity.

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 holder with which the screen printing machine in one embodiment of this invention is equipped, and a mask The block diagram which shows the control system of the screen printer in one embodiment of this invention (A) (b) (c) The figure which shows the descent | fall operation | movement of the squeegee holder with which the screen printer in one embodiment of this invention is provided. (A) (b) (c) The figure which shows the descent | fall operation | movement of the squeegee holder with which the screen printer in one embodiment of this invention is provided. The flowchart of the main routine which shows the flow of the screen printing process which the screen printer in one embodiment of this invention performs The flowchart of the subroutine which shows the flow of the screen printing process which the screen printer in one embodiment of this invention performs (A) (b) (c) The figure explaining the execution procedure of the screen printing process which the screen printer in one embodiment of this invention performs (A) (b) (c) The figure explaining the execution procedure of the screen printing process which the screen printer in one embodiment of this invention performs (A) (b) The figure explaining the execution procedure of the screen printing process which the screen printer in one embodiment of this invention performs (A) (b) The figure explaining the execution procedure of the screen printing process which the screen printer in one embodiment of this invention performs (A) (b) (c) The figure explaining the execution procedure of the screen printing process which the screen printer in one embodiment of this invention performs

  Embodiments of the present invention will be described below with reference to the drawings. 1, 2, and 3, the screen printing machine 1 according to the present embodiment mounts a component (electronic component) 4 on an electrode 3 on the surface of a substrate 2 to produce a mounting substrate (FIG. 1). (Not shown) is a kind of component mounting apparatus, which carries in and positions the substrate 2 put in from the upstream side, and pastes Pst (such as solder paste or conductive paste) on the electrodes 3 on the surface of the substrate 2 The operation of performing screen printing for transferring the image (see FIG. 3) and carrying it out to the downstream side is continuously executed. Hereinafter, for convenience of explanation, the horizontal plane direction in which the substrate 2 is transported in the screen printing machine 1 is defined as the X-axis direction, the horizontal plane direction orthogonal to the X-axis direction is defined as the Y-axis direction, and the vertical direction is defined as the Z-axis. Further, the Y-axis direction is the front-rear direction of the screen printing machine 1 and the X-axis direction is the horizontal (left-right) direction, and the operator OP (FIG. 1) performs the operation on the screen printing machine 1 in the front-rear direction (FIG. 1). 1 is the front side of the screen printing machine 1, and the opposite side (the upper side of the page in FIG. 1) is the rear side.

  1, 2, and 3, the screen printing machine 1 includes a substrate holding / moving unit 12 that is a substrate holding / moving unit provided on a base 11 and a metal provided above the substrate holding / moving unit 12. A plate-shaped mask 13 made of a thin plate material, a pair of front and rear squeegees 14 and a camera unit 15 are provided.

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

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

  2 and 3, the elevating unit 22 is provided to extend upward from the upper surface of the elevating table 22a and the elevating table 22a which are guided by a plurality of elevating table guides 21e of the horizontal moving unit 21 and elevate with respect to the base table 21d. And a plurality of support unit lifting guides 22b.

  2 and 3, the conveyor unit 23 is attached to the upper end of the lower support unit elevating guide 22b, and a pair of front and rear belt conveyor supporting members 23a that elevate with respect to the base table 21d together with the elevating table 22a, and each belt conveyor supporting member. A pair of front and rear belt conveyors 23b supported by 23a is provided, and the front and rear belt conveyors 23b are operated in synchronization to carry the substrate 2 in the X-axis direction.

  2 and 3, the substrate support portion 24 is provided below the conveyor portion 23 on the upper surface of the lower support unit support table 24a and the lower support unit support table 24a which are guided by the lower support unit lifting guide 22b. The lower receiving unit 24b is provided with a plurality of lower receiving pins 24c extending upward. The substrate support unit 24 is configured such that the lower support unit 24b moves up and down with respect to the lift table 22a together with the lower support unit support table 24a, and a plurality of the lower support pins 24c are supported on the lower surface of the substrate 2 supported at both ends by the front and rear belt conveyors 23b. The substrate 2 is supported from below by making contact.

  2 and 3, the substrate clamp portion 25 is a pair of front and rear clamp members 25a provided on the upper portions of the front and rear belt conveyor support members 23a provided in the conveyor portion 23 so as to be movable in the Y-axis direction (see also FIG. 1). ), Both ends of the substrate 2 supported by the front and rear belt conveyors 23b and the lower surface of the substrate 2 are supported by the lower receiving unit 24b. .

  In FIG. 1 and FIG. 2, a substrate carry-in conveyor 26 comprising a pair of front and rear belt conveyors 26 a is provided on the upstream side of the conveyor unit 23 constituting the substrate holding and moving unit 12, and the downstream side of the conveyor unit 23 is A substrate carry-out conveyor 27 comprising a pair of belt conveyors 27a is provided. The substrate carry-in conveyor 26 carries in the substrate 2 input from the outside (upstream side) of the screen printing machine 1 and delivers it to the conveyor unit 23 of the substrate holding and moving unit 12. The substrate 2 delivered from the conveyor unit 23 is carried out of the screen printer 1. As described above, the substrate carry-in conveyor 26, the conveyor unit 23 of the substrate holding and moving unit 12 and the substrate carry-out conveyor 27 function as a substrate carrying path 28 (FIG. 1) for carrying the substrate 2.

  In FIG. 1 and FIG. 2, a pair of portal frames 31 are provided on the base 11 so as to straddle the substrate carry-in conveyor 26 and the substrate carry-out conveyor 27 in the Y-axis direction. The holder 32 is supported.

  2, 3, and 4, the mask holder 32 includes a pair of front and rear guide members 33 that are attached to the gate-type frame 31 and extend in the X-axis direction above the substrate holding and moving unit 12. It consists of a pair of left and right mask support rails 34 extending in the Y-axis direction on a pair of guide members 33. The mask 13 is held in a horizontal position above the substrate holding and moving unit 12 with both left and right ends supported by a pair of left and right mask support rails 34 provided in the mask holder 32.

  In FIG. 1 and FIG. 4, the mask 13 is supported by a mask frame 13w made of a rectangular frame-like member in plan view, and a rectangular region surrounded by the mask frame 13w has a plurality of areas on the substrate 2. A large number of openings 13a (pattern holes) corresponding to the electrodes 3 are provided. That is, the mask 13 has a configuration in which a plurality of openings 13 a corresponding to the arrangement of the electrodes 3 on the substrate 2 are provided.

  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 13 is provided with a pair of mask side alignment marks MK arranged in correspondence with the substrate side alignment marks mk. When the substrate 2 is brought into contact with the mask 13 in a state where the substrate-side alignment mark mk and the mask-side alignment mark MK match in plan view, the electrode 3 of the substrate 2 and the opening 13a of the mask 13 match. It will be in the state.

  2 and 3, the pair of portal frames 31 support both ends of an X-axis stage 35 extending in the X-axis direction so as to be slidable in the Y-axis direction. A camera support stage 36 is provided on the X-axis stage 35 so as to be movable in the X-axis direction. The camera unit 15 is attached to the camera support stage 36. The camera unit 15 includes a first camera 15a whose imaging field is directed downward and a second camera 15b whose imaging field is directed upward.

  In FIG. 1 and FIG. 2, both ends of a squeegee base 37 extending in the X-axis direction are supported by a pair of portal frames 31, and the squeegee base 37 is positioned in a horizontal plane along the portal frame 31 above the mask 13. It can freely reciprocate in the direction (Y-axis direction).

  1, 2, and 3, two squeegee raising / lowering cylinders 38 are provided at positions in the center of the upper surface of the squeegee base 37 that face each other in the Y-axis direction. From these two squeegee raising / lowering cylinders 38, a squeegee raising / lowering shaft 38a comprising a piston rod extends through the squeegee base 37 in the vertical direction and extends downward.

  2 and 3, a squeegee holder 39 that is a squeegee mounting portion extending in the X-axis direction is provided at the lower end of the squeegee lifting shaft 38 a provided in each squeegee lifting cylinder 38. The above-described squeegee 14 made of a “spar” -like member extending in the X-axis direction along the squeegee holder 39 is detachably attached.

  When the squeegee elevating shaft 38a is projected and retracted downward by each squeegee elevating cylinder 38, the squeegee holder 39 attached to the lower end of the squeegee elevating shaft 38a (and hence the squeegee 14) moves up and down with respect to the squeegee base 37. . That is, each squeegee holder 39 (each squeegee 14) is configured to be raised and lowered below the squeegee base 37 by a squeegee lifting cylinder 38 that is an actuator provided on the squeegee base 37. Since the vertical distance between the mask 13 and the squeegee base 37 does not change, the squeegee holder 39 (squeegee 14) moves up and down with respect to the mask 13 when the squeegee lifting shaft 38a is operated.

  Each operation of the substrate carry-in conveyor 26 as the substrate carrying path 28 for carrying the substrate 2, the conveyor unit 23 of the substrate holding and moving unit 12, and the substrate carry-out conveyor 27 is controlled by a control device 40 (FIG. 5) provided in the base 11. The work execution control unit 40a (FIG. 5) performs operation control of the substrate transport path operation mechanism 41 (FIG. 5) including an actuator (not shown).

  Actuation of the horizontal movement unit 21 of the substrate holding and moving unit 12 (movement of the Y table 21a in the Y-axis direction, movement of the X table 21b in the X-axis direction relative to the Y table 21a, and movement of the θ table 21c relative to the X table 21b (ie, the base The rotation of the table 21d around the Z axis) is performed by the work execution control unit 40a of the control device 40 in the horizontal plane inward movement mechanism 42 (FIG. 5) including the actuator including the Y table drive motor My and the X table drive motor Mx described above. ).

  The operation of the lifting / lowering unit 22 of the substrate holding / moving unit 12 (the lifting / lowering of the lifting / lowering table 22a with respect to the base table 21d) is performed by the work execution control unit 40a of the control device 40 in the up-and-down direction moving mechanism 43 (FIG. 5) including an actuator (not shown). This is done by performing the operation control.

  The raising / lowering operation of the lower receiving unit 24b of the substrate holding / moving unit 12, that is, the raising / lowering operation of the lower receiving unit support table 24a with respect to the raising / lowering table 22a is performed by the work execution control unit 40a of the control device 40. This is done by controlling the operation of the mechanism 44 (FIG. 5).

  Clamping and releasing operation of the substrate 2 by the operation of the substrate clamping unit 25 of the substrate holding and moving unit 12 (opening and closing operation of the front and rear clamp members 25a) is performed by the work execution control unit 40a of the control device 40 including an actuator (not shown). This is done by controlling the operation of the clamp portion operating mechanism 45 (FIG. 5).

  As will be described later, the substrate holding and moving unit 12 raises the substrate 2 in a state where the substrate 2 is clamped by a pair of clamp members 25a, so that the electrode 3 on the substrate 2 and the opening 13a of the mask 13 match. The substrate 2 and the upper surfaces of the pair of clamp members 25 a are operated so as to contact the lower surface of the mask 13.

  The movement operation of the camera unit 15 in the horizontal plane (the movement operation of the X-axis stage 35 in the Y-axis direction with respect to the pair of portal frames 31 and the movement operation of the camera support stage 36 in the X-axis direction with respect to the X-axis stage 35) The work execution control unit 40a of the control device 40 controls the operation of the camera unit moving mechanism 46 (FIG. 5) including an actuator (not shown).

  The operation control of the squeegee base 37 for reciprocating the front and rear squeegees 14 in the Y-axis direction is performed by the work execution control unit 40a of the control device 40 controlling the squeegee base moving mechanism 47 (FIG. 5) including an actuator (not shown). Made by. In addition, the ascending / descending operation of each squeegee 14 with respect to the squeegee base 37 is performed when the work execution control unit 40 a of the control device 40 controls the operation of the two squeegee elevating cylinders 38 attached to the upper part of the squeegee base 37.

  The first camera 15 a constituting the camera unit 15 is controlled by the work execution control unit 40 a of the control device 40 and is held by the substrate holding unit including the substrate support unit 24 and the substrate clamp unit 25 of the substrate holding and moving unit 12. The substrate 2 alignment mark mk of the substrate 2 is imaged, and the second camera 15 b is controlled by the work execution control unit 40 a of the control device 40 to image the mask side alignment mark MK provided on the mask 13. I do. Both the image data obtained by imaging with the first camera 15a and the image data obtained by imaging with the second camera 15b are input to the control device 40, and image recognition processing is performed in the image recognition unit 40b (FIG. 5).

  As shown in FIG. 5, the screen printing machine 1 is provided with a touch panel 48 as an input / output device connected to the control device 40, and the operator OP performs a predetermined operation from the touch panel 48, whereby the screen printing machine 1 The operation for performing the screen printing operation by 1 and the operation for stopping the screen printing machine operation being performed can be performed.

  As shown in FIGS. 2 and 3, each squeegee lifting cylinder 38 has a squeegee holder for the squeegee base 37 by detecting a downward stroke of a squeegee lifting shaft 38 a that is a piston rod of the squeegee lifting cylinder 38. A holder position detection sensor 50 for detecting the position 39 (the position of the representative point of the squeegee holder 39. For example, the position of the upper surface of the squeegee holder 39) is provided, and each squeegee with respect to the squeegee base 37 by each holder position detection sensor 50 is provided. Information on the position of the holder 39 is input to the control device 40 (FIG. 5).

  The holder position detection unit 40 c (FIG. 5) of the control device 40 is configured so that the squeegee holder 39 is attached to the squeegee holder 39 based on the position of the squeegee holder 39 relative to the squeegee base 37 detected by the holder position detection sensor 50. It is detected whether or not 14 is located at a contact position PG (FIGS. 6 and 7) that contacts the upper surface of the clamp member 25a (the upper surface of the clamp member 25a in contact with the mask 13). Then, when the squeegee holder 39 is lowered to bring the squeegee 14 into contact with the upper surface of the mask 13, the work execution control unit 40 a of the control device 40 causes the holder position detection unit 40 c to contact the squeegee holder 39. When it is detected that the squeegee holder 39 has reached the contact position PG (FIGS. 6A and 7B), an operation stop signal (squeegee holder) is sent to the squeegee lifting cylinder 38. 39), the descent of the squeegee holder 39 is stopped.

  Here, when the squeegee 14 is attached to the squeegee holder 39 (FIG. 6A), when the squeegee holder 39 is lowered from above the clamp member 25a (the clamp member 25a in contact with the mask 13), When the squeegee holder 39 is located at the contact position PG (the squeegee holder 39 has reached the contact position PG) (FIG. 6B), the squeegee 14 is attached to the clamp member 25a (the clamp member 25a contacting the mask 13). Abuts the top surface. For this reason, when the holder position detection unit 40c of the control device 40 detects that the squeegee holder 39 is positioned at the contact position PG, the operation execution control unit 40a of the control device 40 detects the operation stop signal ( When the squeegee holder 39 lowering stop signal) is output, the squeegee holder 39 stops at the contact position PG and stays there (FIG. 6C). Accordingly, the control device 40 detects a state in which the squeegee holder 39 is located at the contact position PG even after a predetermined time has elapsed since the descent stop signal of the squeegee holder 39 was output.

  On the other hand, for example, when the operator OP forgets to attach the squeegee 14 to the squeegee holder 39 and the squeegee 14 is not attached to the squeegee holder 39 (FIG. 7A), from above the clamp member 25a. Even when the squeegee holder 39 is lowered, when the squeegee holder 39 is positioned at the contact position PG (FIG. 7B), the squeegee 14 does not contact the upper surface of the clamp member 25a. Therefore, when the holder position detection unit 40c of the control device 40 detects that the squeegee holder 39 is located at the contact position PG, the operation execution control unit 40a of the control device 40 detects the operation stop signal of the squeegee lifting cylinder 38. Even if (the squeegee holder 39 lowering stop signal) is output, the squeegee holder 39 does not stop at the contact position PG, but stops at a position beyond the contact position PG (FIG. 7C). ). Therefore, the control device 40 detects a state in which the squeegee holder 39 is not positioned at the contact position PG after a predetermined time has elapsed since the descent stop signal of the squeegee holder 39 was output. In FIGS. 7A, 7B, and 7C, the squeegee 14 that is not actually attached is indicated by a broken line.

  After the controller 40 stops the descent of the squeegee holder 39, the holder position detection unit 40c causes the squeegee holder 39 to be in a contact position after a predetermined time (this predetermined time is about several microseconds). If the squeegee 14 is detected to be positioned on the PG, it is assumed that the squeegee 14 is attached to the squeegee holder 39, and the transfer of the paste Pst to the electrode 3 on the substrate 2 is performed via the opening 13a of the mask 13. Do. Specifically, the transfer of the paste Pst is performed by moving the squeegee base 37 in the horizontal plane direction from the state in which the squeegee 14 is in contact with the mask 13 (on the mask 13 in contact with the clamp member 25a), as will be described later. The squeegee 14 is slid on the mask 13 by moving in the Y axis direction), and the paste Pst supplied on the mask 13 is scraped by the squeegee 14.

  On the other hand, after stopping the descent of the squeegee holder 39, the control device 40 detects that the squeegee holder 39 is not located at the contact position PG after the predetermined time has elapsed by the holder position detection unit 40c. In this case, assuming that the squeegee 14 is not attached to the squeegee holder 39, information (error information) to that effect is notified to the operator OP using the touch panel 48 or the like.

  Thus, in the present embodiment, the touch panel 48 functions as an informing means for informing when the squeegee 14 is not attached to the squeegee holder 39.

  Next, the execution procedure of the screen printing operation by the screen printer 1 will be described with reference to the flowcharts of FIGS. 8 and 9 and the explanatory diagrams of FIGS. Here, FIG. 8 is a flowchart of a main routine showing the flow of the screen printing process executed by the screen printer 1, and FIG. 9 is a flowchart of a subroutine of one process in the main routine.

  When screen printing work is performed by the screen printer 1 in the present embodiment, the control device 40 first displays the paste Pst on the operator OP by displaying an image via the display device 51 (FIG. 5) provided in the screen printer 1. Encourage supply. The operator OP visually checks the paste Pst remaining on the mask 13 and determines whether or not to supply (supplement) the paste Pst based on the amount of the paste Pst. When it is determined that the paste Pst should be supplied, the paste Pst is supplied onto the mask 13 by a separately prepared paste supply syringe (not shown), and when the supply of the paste Pst is finished, the screen printing is performed. The operation start button 52 (FIG. 5) provided in the machine 1 is operated. The operator OP operates the operation start button 52 even when it is determined that the supply of the paste Pst is unnecessary.

  When the control device 40 detects that the operation start button 52 has been operated by the operator OP, the control device 40 operates the substrate carry-in conveyor 26 and the conveyor unit 23 in conjunction with each other and is sent from another device installed on the upstream side of the screen printing machine 1. After the board | substrate 2 which came in is carried in in the screen printer 1, the board | substrate 2 is made still at the predetermined work position on the conveyor part 23 (FIG. 10 (a). Board | substrate carrying-in process of step ST1 shown in FIG. 8).

  When the substrate carrying-in process in step ST1 is completed, the control device 40 closes the front and rear clamping members 25a and clamps the substrate 2 on the conveyor unit 23 from the Y-axis direction (FIG. 10B). Arrow A1) shown. Then, the lower receiving unit 24b is raised while the lifting table 22a is positioned at the lowered position with respect to the base table 21d (arrow B1 shown in FIG. 10C).

  The control device 40 raises the lower receiving unit 24b to bring the lower receiving pin 24c into contact with the lower surface of the central part of the substrate 2 from below to push the substrate 2 upward. The substrate 2 is moved upward while the both ends (both sides) of the substrate 2 are slid with respect to the front and rear clamp members 25a. And when the height of the upper surface of the board | substrate 2 becomes the same height as the upper surface of the clamp member 25a, the raise of the receiving unit 24b is stopped. As a result, the substrate 2 is held by the substrate holding portion (the substrate support portion 24 and the substrate clamp portion 25) (FIG. 10C). The substrate holding step in step ST2 shown in FIG.

  When the substrate holding process in step ST2 is completed, the control device 40 controls the operation of the camera unit moving mechanism 46, moves the X-axis stage 35 in the Y-axis direction, and moves the camera support stage 36 in the X-axis direction. Thus, the first camera 15a is positioned immediately above the substrate-side alignment mark mk provided on the substrate 2. Then, the first camera 15a is caused to image the board-side alignment mark mk to acquire the image data, and the position of the board 2 is detected (FIG. 11A). Board position of step ST3 shown in FIG. Detection step). Further, the control device 40 positions the second camera 15b immediately below the mask side alignment mark MK provided on the mask 13, and causes the second camera 15b to image the mask side alignment mark MK. Image data is acquired and the position of the mask 13 is detected (FIG. 11B) (mask position detection step of step ST4 shown in FIG. 8).

  When the mask position detection process in step ST4 is completed, the control device 40 controls the operation of the horizontal moving unit 21 included in the substrate holding and moving unit 12 and holds it by the substrate holding unit (the substrate support unit 24 and the substrate clamp unit 25). The substrate 2 is moved in the horizontal plane direction so that the substrate-side alignment mark mk and the mask-side alignment mark MK are vertically opposed to each other to align the substrate 2 in the horizontal plane direction with respect to the mask 13 (FIG. Step ST5 alignment step shown in FIG.

  When the positioning process of step ST5 is completed, the control device 40 raises the lifting table 22a with respect to the base table 21d (arrow C1 shown in FIG. 11C), whereby the upper surface of the substrate 2 (printed surface). And the upper surfaces of the clamp members 25a are brought into contact with the lower surface of the mask 13 (FIG. 11C), the contacting step of step ST6 shown in FIG. As a result, the electrode 3 of the substrate 2 and the opening 13a of the mask 13 coincide with each other, and the substrate 2 is in a state where the paste Pst is transferred by the squeegee 14.

  When the contact process of step ST6 is completed, the control device 40 lowers one of the two squeegees 14 and moves the lower end of the squeegee 14 to the clamp member 25a of the mask 13 (of the two clamp members 25a). On the other hand, contact is made from above (FIG. 12 (a) → FIG. 12 (b). Squeegee contact step of step ST7 shown in FIG. 8).

  When the squeegee 14 is in contact with the mask 13 at this time, when the squeegee base 37 is positioned above the front clamp member 25a (FIG. 12A), the front squeegee 14 (FIGS. 12A and 12B). When the squeegee base 37 is positioned above the rear clamp member 25a, the rear squeegee 14 (the right squeegee 14 in FIGS. 12A and 12B). It is.

  Here, in the squeegee contact process of step ST7, as shown in the subroutine of FIG. 9, the control device 40 first controls the operation of the squeegee lifting cylinder 38 from the work execution control unit 40a to lower the squeegee holder 39. (Holder lowering step of step ST21 shown in FIG. 9).

  When the control device 40 starts to lower the squeegee 14, the holder position detection unit 40c monitors the position of the squeegee holder 39 detected by the holder position detection sensor 50, so that the squeegee holder 39 currently being lowered is described above. The state of (arrived) at the contact position PG is detected (contact position arrival detection step of step ST22 shown in FIG. 9).

  When the control device 40 detects that the squeegee holder 39 that is currently lowered is positioned (arrived) at the contact position PG, the control device 40 controls the operation of the squeegee lifting cylinder 38 from the work execution control unit 40a. Is stopped (holder lowering stop step of step ST23 shown in FIG. 9).

  After stopping the descent of the squeegee holder 39 in step ST23, the control device 40 waits for a predetermined time while measuring time with a timer (not shown) (standby step after descent stop in step ST24 shown in FIG. 9). When a predetermined time elapses after the squeegee holder 39 is lowered, the holder position detection unit 40c detects whether or not the squeegee holder 39 is currently in the contact position PG (in step ST25 shown in FIG. 9). Holder position detection step).

  When the holder position detection unit 40c detects that the squeegee holder 39 is located at the contact position PG (FIG. 6C), the control device 40 moves the squeegee holder 39 to the squeegee holder 39. 14 is attached, the process exits from this subroutine and returns to the main routine.

  On the other hand, when the squeegee holder 39 is not positioned at the contact position PG by the holder position detection unit 40c in step ST25 (FIG. 7C), the control device 40 squeegee holder 39. If the squeegee 14 is not attached, information (error information) to that effect is notified to the operator OP using the touch panel 48 described above (notification step of step ST26 shown in FIG. 9).

  After notifying the operator OP in step ST26, the control device 40 operates the squeegee lifting cylinder 38 from the work execution control unit 40a to raise the squeegee holder 39 (holder raising process in step ST27 shown in FIG. 9). .

  When the operator OP confirms that the squeegee 14 is not attached to the squeegee holder 39 on the touch panel 48 and confirms that the squeegee holder 39 has been lifted, the operator OP attaches the squeegee 14 to the squeegee holder 39 and A predetermined operation input (squeegee attachment end operation input) for instructing the control device 40 that the squeegee 14 is attached to the squeegee holder 39 is performed.

  After raising the squeegee holder 39, the control device 40 waits until the operator OP inputs the squeegee attachment end operation input to the touch panel 48 (operation input standby step in step ST28 shown in FIG. 9), and the operator OP touches the touch panel. If it is detected at 48 that the squeegee attachment end operation has been performed, the steps ST21 to ST25 are executed again. Thus, even if the squeegee 14 is not initially attached to the squeegee holder 39, the squeegee 14 is attached to the squeegee holder 39 by the operator OP, and the squeegee 14 is attached to the squeegee holder 39 by the operator OP. After being performed, the squeegee 14 is brought into contact with the mask 13 by the steps ST21 to ST23 performed again.

  The control device 40 moves the squeegee base 37 when the squeegee 14 is brought into contact with the upper surface of the mask 13. Here, if the squeegee 14 in contact with the mask 13 is the front squeegee 14, the squeegee base 37 is moved backward (arrow D <b> 1 shown in FIG. 13A), and the squeegee 14 in contact with the mask 13. If is the rear squeegee 14, the squeegee base 37 is moved forward (arrow D2 shown in FIG. 13B).

  As a result, the squeegee 14 moves (slids) relative to the mask 13, and the paste Pst on the mask 13 is scraped by the paste scraping surface of the squeegee 14 and pushed into the opening 13 a of the mask 13. The paste Pst is transferred onto the second electrode 3 (paste transfer step of step ST8 shown in FIG. 8).

  When the paste transfer process of step ST8 of the main routine is completed, the control device 40 raises the squeegee 14 and separates the squeegee 14 from the mask 13 (squeegee separation process of step ST9 shown in FIG. 8).

  When the squeegee separation process of step ST9 is completed, the control device 40 lowers the lifting table 22a with respect to the base table 21d (arrow C2 shown in FIG. 14A), and separates the substrate 2 from the mask 13 (FIG. 14 (a)). Thus, the plate separation is performed (the plate separation step of step ST10 shown in FIG. 8).

  When the plate separation process of step ST10 is completed, the control device 40 operates the substrate clamp unit 25 to release the clamp of the substrate 2 (arrow A2 shown in FIG. 14B), and then moves the receiving unit 24b. The lift table 22a is lowered (arrow B2 shown in FIG. 14C). Thereby, the board | substrate 2 is dropped on the conveyor part 23, and the holding | maintenance of the board | substrate 2 by a board | substrate holding part (the board | substrate support part 24 and the board | substrate clamp part 25) is cancelled | released (FIG.14 (c)) of step ST11 shown in FIG. Substrate holding release step).

  When the substrate holding release process of step ST11 is completed, the control device 40 operates the horizontal moving unit 21 included in the substrate holding and moving unit 12 to adjust the position of the conveyor unit 23 with respect to the substrate carry-out conveyor 27, and then the conveyor unit 23 and the substrate carry-out conveyor 27 are operated in an interlocked manner, the substrate 2 on the conveyor unit 23 is transferred to the substrate carry-out conveyor 27, and the substrate 2 is directly carried out of the screen printing machine 1 (the substrate carry-out process of step ST12 shown in FIG. 8). ).

  When the substrate carry-out process in step ST12 is completed, the control device 40 determines whether there is another substrate 2 to be screen-printed (substrate presence determination process in step ST13 shown in FIG. 8). As a result, if there is another substrate 2 to be screen-printed, the process returns to step ST1 to carry in a new substrate 2, and if there is no other substrate 2 to be screen-printed, a series of screen printing operations. Exit.

  The substrate 2 carried out from the screen printing machine 1 is delivered to another component mounting apparatus (not shown) such as a component mounting machine located on the downstream side of the screen printing machine 1.

  As described above, in the screen printing machine 1 according to the present embodiment, the squeegee holder 39 is positioned at the contact position PG where the squeegee 14 attached to the squeegee holder 39 contacts the clamp member 25 a that contacts the mask 13. Holder position detecting means (holder position detecting sensor 50 and holder position detecting portion 40c of control device 40) and squeegee raising / lowering cylinder 38 are controlled to lower the squeegee holder 39 to detect the holder position. When the detection means detects that the squeegee holder 39 is located at the contact position PG, the work execution control unit 40a of the control device 40 as the squeegee lowering control means for stopping the squeegee holder 39 from descending, and the squeegee holder 39 After a predetermined time has elapsed since the descent was stopped, the holder position detecting means When it is detected that the jig holder 39 is located at the contact position PG, the squeegee base 37 is moved in the horizontal plane direction to paste the electrode 3 on the substrate 2 through the opening 13a of the mask 13. When Pst is transferred and a predetermined time has elapsed after the descent of the squeegee holder 39 is stopped, when the holder position detecting means detects that the squeegee holder 39 is not located at the contact position PG, Control means (control device 40) for notifying that the squeegee 14 is not attached to the squeegee holder 39 via the touch panel 48 as notification means is provided.

  Further, the screen printing method in the present embodiment is a screen printing method by the screen printing machine 1, and the operation of the squeegee lifting cylinder 38 is controlled to lower the squeegee holder 39, and the squeegee holder 39 is moved by the holder position detecting means. A step of stopping the descent of the squeegee holder 39 when it is detected that the squeegee holder PG is located (steps ST21 to ST23), and a predetermined time after the descent of the squeegee holder 39 is stopped. When the holder position detecting means detects that the squeegee holder 39 is located at the contact position PG, the squeegee base 37 is moved in the horizontal plane direction on the substrate 2 through the opening 13a of the mask 13. Step of transferring the paste Pst to the electrode 3 (step ST24, step ST2 And step ST8), and when a predetermined time has elapsed after stopping the descent of the squeegee holder 39, and when the holder position detecting means detects that the squeegee holder 39 is not positioned at the contact position PG, This includes a step of notifying that the squeegee 14 is not attached to the holder 39 (step ST24, step ST25 and step ST26).

  In the screen printing machine 1 and the screen printing method according to the present embodiment, when it is detected that the squeegee holder 39 being lowered is positioned at the contact position PG, the descent of the squeegee holder 39 is stopped. When it is detected that the squeegee holder 39 is not positioned at the contact position PG, the squeegee 14 is informed that the squeegee 14 is not attached to the squeegee holder 39. Therefore, it is possible to prevent screen printing from being started in a state where the squeegee 14 is not attached to the squeegee holder 39, and to prevent the productivity of the substrate 2 from being lowered.

  In the present embodiment, the squeegee 14 attached to the squeegee holder 39 is lowered when the squeegee holder 39 to be detected as to whether the squeegee 14 is attached is lowered with respect to the clamp member 25a. The squeegee 14 is in contact with the clamp member 25a due to the influence of the thickness of the paste Pst and the like, because it has fallen onto the supplied paste Pst on the clamp member 25a (on the mask 13 in contact with the front clamp member 25a). Nevertheless, if there is a possibility that the squeegee holder 39 is not located at the contact position PG, there is a possibility that the squeegee 14 is attached. The squeegee holder 39 is clamped on the opposite side of the paste member Pst to the clamp member 25a. So that lowering above. For example, when the paste Pst is supplied onto the front clamp member 25a by the paste supply syringe, whether or not the squeegee 14 is attached to the squeegee holder 39 is checked above the rear clamp member 25a. . Thereby, the squeegee 14 does not descend onto the paste Pst, and the above inconvenience is solved.

  Although the embodiment of the present invention has been described so far, the present invention is not limited to the above. For example, in the above-described embodiment, the screen printing machine 1 is configured to include two squeegees 14, but the number of squeegees 14 is not limited to two and may be one.

  Further, the holder position detecting means detects whether or not the squeegee holder 39 is located at the contact position PG where the squeegee 14 attached to the squeegee holder 39 contacts the clamp member 25 a that contacts the mask 13. However, as shown in the above-described embodiment, the configuration for detecting the position of the squeegee holder 39 relative to the squeegee base 37 may not be provided.

  A screen printing machine and a screen printing method capable of preventing screen printing from being started in a state where a squeegee is not attached to a squeegee holder.

1 Screen Printer 2 Substrate 3 Electrode 12 Substrate Holding / Moving Unit (Substrate Holding / Moving Unit)
13 Mask 13a Opening 14 Squeegee 25a Clamp member 37 Squeegee base 38 Squeegee lifting cylinder (actuator)
39 Squeegee holder 40 Control device (control means)
40a Work execution control unit (squeegee lowering control means)
40c Holder position detection unit (holder position detection means)
48 Touch panel (notification means)
50 Holder position detection sensor (holder position detection means)
PG contact position Pst paste

Claims (2)

A mask provided with a plurality of openings according to the arrangement of the electrodes on the substrate;
Substrate holding and moving means for raising the substrate in a state where the substrate is clamped by the pair of clamp members, and bringing the upper surface of the substrate and the pair of clamp members into contact with the lower surface of the mask so that the electrode on the substrate and the opening of the mask coincide with each other When,
A squeegee base that is moved in the horizontal plane above the mask;
A squeegee holder that is moved up and down below the squeegee base by an actuator provided on the squeegee base;
A squeegee that is detachably attached to the squeegee holder;
A holder position detecting means for detecting whether or not the squeegee holder is located at a contact position where the squeegee attached to the squeegee holder contacts the clamp member contacting the mask;
Squeegee lowering control means for controlling the actuator to lower the squeegee holder and stopping the squeegee holder from lowering when the holder position detecting means detects that the squeegee holder is positioned at the contact position;
After a predetermined time has elapsed after the squeegee holder has stopped descending, if the holder position detecting means detects that the squeegee holder is in the contact position, the squeegee base is moved in the horizontal plane. Then, the paste is transferred to the electrode on the substrate through the opening of the mask, and after the predetermined time has elapsed after the descent of the squeegee holder is stopped, the holder position detecting means causes the squeegee holder to move to the contact position. And a control means for notifying that the squeegee is not attached to the squeegee holder via the notification means when it is detected that the squeegee is not located on the screen printing machine. The mask is provided with a plurality of openings according to the arrangement of the electrodes on the substrate, and the substrate is lifted while the substrate is clamped by a pair of clamp members so that the electrodes on the substrate and the openings of the mask match. A substrate holding and moving means for bringing the upper surface of the substrate and the pair of clamp members into contact with the lower surface of the mask, a squeegee base moved in the horizontal plane above the mask, and an actuator provided on the squeegee base, below the squeegee base. Whether the squeegee holder that is raised and lowered, the squeegee that is detachably attached to the squeegee holder, and whether the squeegee holder is in a contact position where the squeegee attached to the squeegee holder contacts the clamp member that contacts the mask. A screen printing method by a screen printer provided with a holder position detecting means for performing detection,
Performing the operation control of the actuator to lower the squeegee holder, and stopping the lowering of the squeegee holder when the holder position detecting means detects that the squeegee holder is located at the contact position;
After a lapse of a predetermined time after stopping the descent of the squeegee holder, when the holder position detecting means detects that the squeegee holder is located at the contact position, the squeegee base is moved in the horizontal plane. Transferring the paste to the electrode on the substrate through the opening of the mask;
A squeegee is attached to the squeegee holder when the holder position detecting means detects that the squeegee holder is not positioned at the contact position after the predetermined time has elapsed since the descent of the squeegee holder was stopped. And a step of notifying that there is no screen printing method.

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