JPWO2018037552A1 - Screen printing machine - Google Patents

Abstract

A squeegee device (3) for pressing cream solder into a print pattern with respect to a mask (20) on which a print pattern consisting of a plurality of through holes is formed, and a pair of mask receiving members (58) capable of adjusting the spacing in the substrate transport direction. The substrate (10) is held by the mask holding device (2) holding the mask (20) by the above and the pair of substrate holding portions (38) arranged in the direction orthogonal to the substrate transfer direction, Substrate holding device (5) provided with a lift mechanism (13) for positioning from below, a movable imaging device (6), and a control device (7) for controlling the drive of each device; In the unit (38), clamp members (62) having different lengths according to the substrate size are attachable to and detachable from the base portion (61), and the control device (7) uses the imaging information from the imaging device (6). Based on the mask receiving member (58) and the substrate holder (38) Screen printer (1) that performs interference judgment with

Description

  The present invention relates to a screen printing machine that prevents interference between members.

  In a screen printing machine, a mask having a printing pattern (a through hole for printing) is held inside the machine, and a substrate is transported by the substrate transport device therebelow, and screen printing with cream solder is performed on the substrate It is configured as follows. In the screen printing machine, in addition to the substrate transfer device, a substrate holding device for holding the transferred substrate and positioning it at the printing location, a mask holding device for positioning and holding the mask, and a mask On the other hand, a squeegee device or the like for spreading the cream solder from the upper surface is provided.

  There are various sizes of substrates to be printed, and masks having sizes corresponding to the substrates are prepared. Therefore, the substrate holding device and the mask holding device are subjected to recombination, position adjustment, and the like of the members in setup replacement for changing to the respective sizes. For example, Patent Document 1 below discloses a configuration in which, with respect to a mask holding device, an interval between mask support bases holding both ends of the mask can be adjusted according to a size change. Further, the substrate holding device has a pair of clamp pieces for directly holding the substrate from the width direction, and the clamp pieces have a length corresponding to the size of the substrate according to the size of the substrate by detaching the joint piece. Are disclosed.

JP 2007-190714 A

  In the screen printer of the prior art, it is possible to easily change the length of the clamp piece in the setup change. However, in the setup change performed by the operator, although the clamp pieces are switched to the short type even though the distance between the mask supports is narrowed because the mask size is reduced, the long type in which the joint pieces are erroneously mounted It is thought that it has been left. This point is all the more likely if the mask holding device is a screen printing machine with a mechanism for automatically adjusting the spacing of the mask supports. Then, if the screen printing machine is operated with the long clamp piece attached in spite of the reduction of the mask holding interval, interference between the mask support and the clamp piece occurs. It may cause damage, or the adjustment of each device may be incorrect, requiring time and extra time for readjustment.

  Then, this invention aims at providing the screen printer which performs interference determination of members in order to solve this subject.

  A screen printer according to one aspect of the present invention includes a squeegee device for pressing cream solder into the print pattern with respect to a mask on which a print pattern including a plurality of through holes is formed, and a pair of adjustable spacings in the substrate transport direction. A mask holding device for holding the mask by the mask receiving member, and a lift mechanism for holding the substrate by a pair of substrate holding units arranged in a direction orthogonal to the substrate transfer direction and positioning the substrate from below with respect to the mask A substrate holding device, a movable imaging device, and a control device for controlling the drive of each of the devices, wherein the substrate holding portion has base members of which clamp members have different lengths depending on the substrate size The control device is attachable and detachable, and the control unit determines the interference between the mask receiving member and the substrate holding unit based on the imaging information from the imaging device. Is Umono.

  According to the present invention, when a predetermined length of the clamp members having different lengths in the substrate holding unit is attached to the base portion, the control device clamps the clamp member of the predetermined length based on the imaging information from the imaging device. Since the interference determination between the substrate holding unit attached with the mask receiving member and the mask receiving member is performed, even if there is an error in the attachment of the clamp member, it is possible to perform the process for preventing the interference based on the determination result.

FIG. 1 is a perspective view of an embodiment of a screen printer. It is the side view which showed the inside of the screen printing machine simply. It is a simple internal block diagram of a screen printing machine. It is the perspective view which showed the mask holder of the state holding the mask of large size. It is the perspective view which showed the mask holder of the state holding the mask of small size. It is the perspective view which showed the clamp part. It is the figure which showed the positional relationship of the clamp piece from which length differs. It is the figure which showed the flowchart of the size determination processing by execution of a size determination program.

  Next, one embodiment of a screen printing machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the screen printing machine of the present embodiment, in which the top open / close cover is open. FIG. 2 is a side view simply showing the inside of the screen printing machine. The screen printing machine 1 prints cream solder on a substrate, and constitutes, for example, a circuit board production line together with an inspection machine for inspecting a printing state, a component mounting machine for mounting an electronic component on the substrate, and the like.

  In the screen printing machine 1, a substrate is transported under a mask installed in the machine, and cream solder is applied to the lower substrate from the mask top surface through a print pattern (through hole). Therefore, a pair of mask holders 2 arranged in the machine width direction is provided on the upper side of the screen printing machine 1 in the machine, and the mask fixed to the mask frame is held. A squeegee device 3 is installed further above the mask holder 2 and attached so as to be movable in the longitudinal direction of the machine body. In the present embodiment, the machine longitudinal direction of the screen printing machine 1 will be described as the Y-axis direction, the machine width direction (the transport direction of the substrate 10) as the X-axis direction, and the machine height direction as the Z-axis direction.

  On the lower side of the mask holder 2, a substrate table 5 for transporting the substrate and holding the substrate at a predetermined position is installed. The substrate table 5 includes a substrate transfer device for loading and unloading a substrate in the machine width direction, a clamp device for clamping the substrate in the longitudinal direction of the machine, and a backup device for moving the substrate up and down to the clamp position. . FIG. 3 is a simplified internal block diagram of the screen printing machine shown with the substrate table 5 at the center.

  The screen printing machine 1 is entirely covered by an airframe cover 4 (see FIG. 1). Conveying ports 601 are formed on both sides in the width direction of the body cover 4 so that loading and unloading by the substrate conveying device 11 can be performed through the conveying ports 601 to the substrate 10 moving from the upstream side to the downstream side of the production line. It has become. The substrate transfer device 11 is assembled to the substrate table 5 and is constituted by a pair of conveyor belts 21 supporting both sides of the substrate 10.

  A substrate transfer device 11 for transferring the substrate 10 and a clamp device 12 for holding the transferred substrate 10 are assembled to the lifting device 13. The lifting device 13 includes a lifting platform 24 which slides along a vertical guide rail 23, and the lifting platform 24 is connected to a lifting motor 26 via a ball screw mechanism 25. The substrate transfer device 11 and the clamp device 12 are mounted on the elevating table 24 via the support table 27.

  A pair of mask supports 31 are provided on the support table 27 in the longitudinal direction of the machine (Y-axis direction), and the clamp device 12 is disposed therebetween. A pair of mask supports 31 positioned in the longitudinal direction of the machine body are each provided with a gate-shaped leg body 311 in the machine body width direction (X-axis direction), and the mask support plate 312 with which the mask 20 contacts is fixed on the upper surface . A ball screw mechanism in which a fixing nut inside the leg 311 and a screw shaft 32 are screwed together is formed on one mask support 31 (right side in the drawing). Therefore, the control of the drive motor for rotating the screw shaft 32 enables adjustment of the distance to the other mask support 31.

  The clamp device 12 has a pair of side frames 35 arranged in the longitudinal direction of the machine orthogonal to the transfer direction of the substrate 10 with respect to the support base 33, and one side frame 35 (right side in the drawing) The screw 37 is engaged to form a ball screw mechanism, and the distance from the other side frame 35 can be adjusted by the rotation of the clamp motor with respect to the screw shaft 37. Further, a clamp portion 38 is formed at the upper end portion of the side frame 35, and the substrate 10 can be gripped by adjusting the distance between them. The substrate transfer device 11 is assembled to the side frame 35, and the substrate 10 transferred by the conveyor belt 21 is held by the pair of clamp portions 38.

  Also, a backup device 14 is provided between the pair of side frames 35. The backup device 14 has a plurality of backup pins 42 attached to the backup table 41, but the backup pins 42 are arranged so as to avoid electronic components mounted on the substrate 10. The support 33 of the clamp device 12 is supported via a ball screw mechanism that converts the rotational output of the lift motor 43 into lift motion. Furthermore, the drive motor 44 is fixed to the support base 33, and the backup table 41 is supported via a ball screw mechanism that converts its rotational output into vertical movement.

  Next, the squeegee device 3 is provided on the set mask 20. The squeegee device 3 applies to the substrate 10 located below the mask 20 by pressing the cream solder into the printing pattern of the mask 20 while rolling. The squeegee device 3 is mounted on the traveling platform 45 so that a pair of squeegee heads 301 and 302 provided with the squeegee can be moved up and down by a cylinder. The traveling table 45 is slidably assembled to a guide rod 46 installed in the longitudinal direction of the machine body, and can move linearly in the horizontal direction. Further, a screw shaft 47 parallel to the guide rod 46 is rotatably mounted on the screen printing machine 1 so that rotation can be given by a drive motor. And, a ball screw mechanism is configured by the fixing nut and the screw shaft 47 inside the traveling table 45.

  Further, at a height between the mask holder 2 and the substrate table 5, a camera 6 for imaging a substrate mark or a mask mark attached to the substrate 10 or the mask 20 is provided. The camera 6 is attached to a guide rail 51 in the longitudinal direction of the machine via a Y-axis slider 48, and the guide rail 51 on which the camera 6 is mounted is an X-axis slider on two guide rails 52 in the machine width direction. It is constructed via 53. Therefore, the camera 6 is configured to be movable on the XY plane by the Y-axis slider 48 and the X-axis slider 52.

  The screen printing machine 1 is equipped with a control device 7 for controlling the overall drive, and drive control set for the drive unit of each device is performed. The control device 7 includes a control unit including a computer and an input / output unit, a plurality of drive circuits, and the like. The computer includes a CPU, a ROM, a RAM, and a bus connecting them. An image processing computer is connected to an input / output unit, and a lifting motor 26 and the like are connected via a drive circuit.

  In printing on the substrate 10 in the screen printing machine 1 configured as described above, first, the substrate 10 is carried in between the pair of side frames 35 by the conveyor belt 21. Then, the backup table 41 is lifted by the drive of the elevating motor 44, and the substrate 10 is lifted from the conveyor belt 11 so as to be pushed up by the backup pins 42. Further, when the screw shaft 37 is given rotation, one side frame 35 moves, and the substrate 10 is sandwiched and held by the clamp portions 38 of the pair of side frames 35.

  Then, by driving the lifting motor 43, the entire clamp device 12 holding the substrate 10 ascends, the clamp portion 38 and the substrate 10 are aligned with the height of the mask support plate 312, and the height of the upper surface is It will be aligned. Thereafter, the elevating table 24 is raised by the driving of the elevating motor 26 and stopped at the printing position where the upper surfaces of the mask support plate 312, the clamp portion 38 and the substrate 10 lightly contact the lower surface of the mask 20. On the other hand, on the upper surface side of the mask 20, the supplied cream solder is rolled on the mask 20 by the squeegee device 3 and pushed into the print pattern. As a result, the cream solder is printed on the substrate 10 located under the mask 20 through the through holes of the print pattern.

  By the way, the mask 20 is a very thin rectangular metal plate on which a print pattern is formed, the outer edge portion is fixed by a square mask frame, and the planar state is maintained. The pair of mask holders 2 are disposed at predetermined intervals in the transport direction of the substrate 10, and hold two sides of the mask frame. The mask holder 2 has a position adjusting function that can move in the width direction of the machine, and has a configuration capable of adjusting the interval according to the size of the mask 20. FIG. 4 and FIG. 5 are perspective views showing the mask holder 2 and among the prepared plurality of masks 20 (for example, three of the masks 20L, 20M and 20S in descending order of size), FIG. FIG. 5 shows a state in which the mask 20L is held, and FIG. 5 shows a state in which the mask 20S of a small size is held.

  A pair of mask holders 2 located in the machine body width direction (X-axis direction) are symmetrically assembled to the portal-type leg 55, respectively. In the mask holder 2, guide blocks 56 are fixed at two positions on the upper surface of the leg 55, rod-like sliders 57 are slidably assembled, and a mask receiver 58 is fixed to two sliders 57. . Therefore, the mask holder 2 of the screen printing machine 1 can adjust the distance between the pair of mask receivers 58 according to the size of the mask 20 by the operator. For example, the slider 57 is graduated, and the alignment based on the guide block 56 enables the movement of the mask receiver 58 in accordance with the sizes of the masks 20L, 20M, and 20S.

  The mask receiver 58 is an L-shaped plate-like member, and is disposed such that horizontal portions on which the mask frame 202 is placed face each other. Further, two air cylinders 59 are attached to each mask receiver 58, and the mask frame 202 is held by the mask receiver 58 by the pressing of a piston rod that operates to extend downward. When the replacement from the large mask 20L shown in FIG. 4 to the small mask 20S shown in FIG. 5 is performed, that is, the size reduction of the mask 20 is accompanied by the size change of the substrate 10, the clamp unit 38 of the clamp device 12 is also changed. To be done. Here, FIG. 6 is a perspective view showing the clamp portion 38. As shown in FIG.

  A base plate 61 on which positioning projections 611 are formed in the longitudinal direction is fixed to the side frame 35 of the clamp device 12, and a plurality of clamp pieces 62 prepared for the base plate 61 are detachable. . For example, three clamp pieces 62 of a long clamp piece 62L, a medium clamp piece 62M, and a short clamp piece 62S are prepared. Such clamp pieces 62 are fixed in position relative to the base plate 61 by bolts.

  FIG. 7 is a view showing the positional relationship of the clamp pieces 62L, 62M, 62S attached to the base plate 61. As shown in FIG. When the size reduction is performed, the mask receiver 58 is moved in the direction indicated by the arrow to change the position to the position indicated by the alternate long and short dash line. The length direction of the clamp piece 62 attached to the clamp device 12 is the machine width direction (X-axis direction) as shown in FIG. Therefore, when the distance between the pair of mask receivers 58 arranged in the machine width direction is reduced by a certain amount or more, the mask receivers 58 overlap the end of the long clamp piece 62L, and as described in the above-mentioned problem, Interference between the receiver 58 and the clamp piece 62L occurs.

  Specifically, in the case where interference occurs, the clamp piece 62L is not replaced with the clamp piece 62M or 62S even though the repositioning of the pair of mask receivers 58 is performed as shown in FIGS. 4 to 5. That's the case. When the substrate 10 ascends with respect to the mask 20 in such a state, the end of the clamp piece 62L collides with the lower surface of the mask receiver 58. In this regard, if the clamp pieces 62 are properly replaced, the substrate 10 can be brought into contact with the mask 20 without interference. Therefore, in the present embodiment, a configuration is adopted to prevent interference between the mask receiver 58 and the clamp piece 62 by eliminating an exchange error by the operator.

  First, as shown in FIG. 7, recognition marks 621, 622, 623 having different shapes are attached to the clamp pieces 62L, 62M, 62S constituting the clamp part 38. As shown in FIG. In the present embodiment, square, circle, and rhombus marks are attached in order from the long clamp piece 62L. The recognition marks 621, 622, 623 are picked up by the camera 6 and subjected to image processing. In addition, since this mark should just be the thing which can identify the length of a clamp piece, a shape etc. are not specifically limited, such as what differs in a magnitude | size in the same shape.

  On the other hand, as shown in FIGS. 4 and 5, on the mask holder 2, an arm 65 parallel to the leg 55 in the X-axis direction is fixed, and a recognition rod is attached to the lower end face thereof. 66 is mounted vertically. The recognition mark on the lower end face of the confirmation rod 66 is also imaged by the camera 6 and subjected to image processing. However, as long as the presence or absence of the confirmation rod 66 can be recognized from the imaging data of the camera 6, the recognition mark is not necessarily required. Further, a shielding plate 67 is fixed to the mask receiver 58 in parallel with the X-axis direction. The shield plate 67 is configured to hide the confirmation rod 66 from the camera 6 when the mask receiver 58 moves to a position where the mask receiver 58 may interfere with the clamp piece 62L.

  Then, in the control device 7, a size determination unit 701 is provided in the ROM of the computer, and a size determination program is stored (see FIG. 3). FIG. 8 is a diagram showing a flowchart of size determination processing by execution of the size determination program. Therefore, next, the size determination process will be described. In the size determination process, first, the clamp piece 62 attached to the clamp device 12 is checked (S101). That is, with regard to any one of the clamp pieces 62L, 62M and 62S attached to the clamp unit 38, the recognition mark 621, 62 or 623 is imaged by the camera 6, and the imaged data is subjected to image processing by the control device 7. Thus, a check is made as to what size clamp piece 62 is attached.

  Next, it is judged whether the confirmed clamp piece 62 is the long clamp piece 62L (S102), and in the case of the medium or short clamp piece 62M or 62S instead of the clamp piece 62L (S102: NO), this size determination process ends. This is because, in the present embodiment, the determination with respect to the interference with the mask receiver 58 is made only when the clamp piece 62L having the possibility of interference is attached. Therefore, in the case of the mask receiver 58, the clamp pieces 62M and 62S of short size in which interference does not occur will shift to the next drive processing in the screen printing machine 1.

  When the clamp piece 62L is attached (S102: YES), position confirmation is performed for the pair of mask receivers 58 (S103). That is, the camera 6 moves to the imaging position with respect to the confirmation rod 66 at the home position, and the imaging data of the camera 6 imaged there is sent to the control device 7 and image processing is performed. Then, the position of the mask receiver 58 is confirmed depending on whether the recognition mark of the confirmation rod 66 is imaged (S104). If the recognition mark can be confirmed (S104: YES), it can be seen that the pair of mask receivers 58 is in a state of being separated by a large distance as shown in FIG. At this time, since the interference between the mask receiver 58 and the clamp piece 62L does not occur, the size determination process ends.

  On the other hand, as shown in FIG. 5, when the distance between the pair of mask receivers 58 is short, the shielding plate 67 is positioned between the check rod 66 and the camera 6 so that the recognition mark can not be imaged. As described above, when the recognition mark can not be confirmed from the imaging data (S104: NO), the warning process is performed without raising the clamp device 12 (S105). Then, the size determination process ends. In the warning process, the driving of the screen printing machine 1 is stopped, and the signal tower 8 is blinked or notified to the operator by a buzzer, voice or the like. Therefore, the clamp piece 62L is removed from the base plate 61 by the operator who notices the mounting error, and the clamp piece 62M or 62S is replaced.

  Therefore, according to the present embodiment, even if there is an error in the attachment of the clamp piece 62, the interference between the mask receiver 58 and the clamp piece 62L is confirmed by the size determination process, so that the interference can be prevented in advance. . In particular, since the driving of the screen printing machine 1 is stopped by the warning process (S105), the end of the clamp piece 62L can be prevented from colliding with the lower surface of the mask receiver 58 without the clamp portion 38 rising. . In addition, it is possible to make the operator confirm the replacement error of the clamp piece 62 by blinking display of the signal signal tower 8 or the like.

  And in this embodiment, the said effect can be achieved inexpensively by performing a size determination process, without changing a structure and changing significantly with respect to the conventional screen printer. Further, in the size determination process of the present embodiment, since the position confirmation of the mask receiver 58 is performed only in the case of the clamp piece 62L having a possibility of interference, the processing time can be shortened.

  Furthermore, in the present embodiment, since the position of the mask receiver 58 is determined by imaging the confirmation rod 66 at the fixed position, the determination process necessary for the interference determination can be simplified. In this respect, as another method of grasping the position of the mask receiver 58, a mechanism for searching the mask receiver mark attached to the mask receiver 58 or the mask mark attached to the mask 20 by the camera 6 is used. The position of the mask receiver 58 may be accurately identified from the information. However, since the operator intervenes in the installation of the mask receptacle 58 and the mask 20, the positions of the mask receptacle mark and the mask mark are not necessarily constant. At this point, the confirmation rod 66 of the mask holder 2 is at a fixed position.

  Therefore, with the check rod 66, the position of the mask receiver 58 can be recognized in a short time. On the other hand, in the mechanism in which the mask mark is searched by the camera 6, there is a possibility that it takes time to recognize the mask mark. However, in order to align the substrate 10 and the mask 20, There is an advantage that the camera 6 can be moved to an appropriate mark reading position because position information of the encoder can be used when recognizing the same or different marks as the position recognition marks.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to these, A various change is possible in the range which does not deviate from the meaning.
For example, although the length of the clamp piece 62 can be determined from the image data of the recognition marks 621, 622, 623 in the above embodiment, the edge position of the clamp pieces 62L, 62M, 62S can be determined by imaging. May be
Further, in the above embodiment, interference with the mask receiver 58 can not occur with the short clamp pieces 62M and 62S, so that the confirmation rod 66 is determined by only one, but interference also with the clamp 62M If there are, the two confirmation rods 66 may be attached so that the position of the mask receiver 58 in the middle can also be confirmed.

DESCRIPTION OF SYMBOLS 1 ... Screen printing machine 2 ... Mask holder 3 ... Squeegee device 5 ... Table table 6 ... Camera 7 ... Control device 10 ... Substrate 12 ... Clamp device 13 ... Elevation device 14 ... Backup device 20 (20L, 20M, 20S) ... Mask 38 Clamp part 58 Mask holder 61 Base plate 62 (62L, 62M, 62S) Clamp piece 67 Shielding plate 66 Rod for confirmation 621, 622, 623 Recognition mark

Claims (5)

A squeegee device for pressing cream solder into the print pattern against a mask on which a print pattern having a plurality of through holes is formed;
A mask holding device for holding a mask by a pair of mask receiving members capable of adjusting the distance in the substrate transfer direction;
A substrate holding apparatus including a lift mechanism configured to hold a substrate by a pair of substrate holding units disposed in a direction orthogonal to the substrate transfer direction and to position the substrate from below with respect to the mask;
A movable imaging device,
And a controller for controlling driving of each of the devices.
In the substrate holding unit, clamp members having different lengths depending on the substrate size can be attached to and detached from the base portion, respectively.
The said control apparatus is a screen printing machine characterized by performing interference determination with the said mask receiving member and the said board | substrate holding part based on the imaging information from the said imaging device.   The control device identifies the corresponding clamp member from the imaging information, and when the identified clamp member is a long clamp member set as a determination target, interference between the mask receiving member and the substrate holding unit The screen printing machine according to claim 1, characterized in that the determination is made. The clamp member is provided with size recognition marks of different shapes according to the length, or size recognition marks of the same shape and different sizes according to the length,
The control device specifies the corresponding clamp member from the imaging information of the size recognition mark, and performs interference determination between the mask receiving member and the substrate holding unit. The screen printing machine according to Item 2.   The imaging device is for imaging a mask mark and a substrate mark attached to a mask and a substrate, and the control device confirms the position of the mask receiving member from the position of the mask mark imaged by the imaging device. The screen printing machine according to any one of claims 1 to 3, wherein the interference determination between the mask receiving member and the substrate holding unit is performed by doing this. A shielding member that shields the mask receiving recognition mark from the imaging device according to one or more mask receiving identification marks attached to the mask receiving member or aligned in the moving direction, and the moving position of the mask receiving member Have and
The control device checks the position of the mask receiving member based on the presence or absence of imaging information of the mask receiving recognition mark, and performs interference determination between the mask receiving member and the substrate holding unit. The screen printer according to any one of claims 1 to 3.

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