JP6251391B2 - Surface mount machine - Google Patents

Description

  The present invention relates to a scan unit mounting structure.

  2. Description of the Related Art Conventionally, a surface mounter that sucks an electronic component supplied from a feeder by a mounting head mounted on a head unit and mounts the electronic component on a printed board is widely known. The surface mounter is equipped with a component recognition device mainly including a camera, and has a configuration in which the posture of the electronic component sucked and held by the mounting head is recognized and inspected.

  There are two types of component recognition devices: a fixed type and a scan type. In the fixed type, as described in Patent Document 1, the electronic component is photographed by a fixed type camera installed on a base. The fixed type has the advantage that a large electronic component can be photographed because the field of view of the camera is large, but it is necessary to move the head unit that mounts the mounting head to the installation position of the camera after suction of the electronic component The moving distance of the head unit becomes longer.

  On the other hand, as described in Patent Document 2, in the scanning type, the camera is moved relative to the head unit to photograph the electronic component. The scan type is not suitable for shooting large electronic components because the field of view of the camera is small, but it is possible to take images of electronic components using the time to move the electronic components to the mounting position on the printed circuit board. Therefore, the moving distance of the head unit can be shortened compared to the fixed type.

JP-A-11-40996 JP 2008-166550 A

(Problems to be solved by the invention)
In this way, the fixed type and the scan type have different merits and demerits.Therefore, when using only the fixed type, when using only the scan type, both the fixed type and the scan type may be used. There was a demand for easy attachment and detachment.

  The present invention has been completed based on the above situation, and an object of the present invention is to allow a scan unit to be easily attached to and detached from a head unit.

(Means for solving the problem)
The present invention is a surface mounter for mounting electronic components on a printed circuit board, comprising a base, a head unit having a plurality of mounting heads arranged in one direction, and the head unit as the base. A driving device that moves in a plane direction above, and a scan unit provided in the head unit, wherein the scan unit captures an electronic component sucked and held by the mounting head, and the scan Including a slide device for sliding the camera along the one direction, and an attachment portion provided in the slide device, and by attaching and detaching the attachment portion of the slide device from the attached portion provided in the head unit, The entire scan unit including the scan camera and the slide device is attached to and detached from the head unit.

(Effect of the invention)
In the present invention, the scan unit can be easily attached to and detached from the head unit.

It is a top view of the surface mounter applied to one embodiment. It is a figure which shows the support structure of a head unit. It is a front view of a head unit. It is a perspective view of a head unit and a scan unit. It is a perspective view of a scan unit. It is a disassembled perspective view of a scan unit. It is sectional drawing (AA sectional view taken on the line of FIG. 6) of a slide apparatus. FIG. 3 is a side view of the head unit (showing a state where a scan unit is attached). FIG. 3 is a side view of the head unit (showing a state where a scan unit is removed). It is a block diagram which shows the electric constitution of a surface mounter. It is the figure which expanded the lower part of the head unit. It is the figure which expanded the lower part of the head unit. It is a flowchart figure which shows the flow of the correction process performed by the control part. It is the figure which expanded the lower part of the head unit.

DESCRIPTION OF SYMBOLS 1 ... Surface mounter 11 ... Base 30 ... Drive device 60 ... Head unit 61 ... Support frame 65 ... Mounted part 70 ... Unit main body 73 ... Mounting head 77 ... Position reference member 80 ... Scan unit 90 ... Slide device 91 ... Frame 95 ... Mounting flange (corresponding to "mounting part" of the present invention)
130 ... Harness unit 200 ... Controller 210 ... Control unit 220 ... Storage unit

<One Embodiment>
1. Overall Configuration of Surface Mounter As shown in FIG. 1, the surface mounter 1 includes a base 11, a transport conveyor 20 that transports a printed circuit board P, a head unit 60, and a head unit 60 on the base 11. And a driving device 30 that moves in the plane direction (XY direction). In the following description, the longitudinal direction of the base 11 (the horizontal direction in FIG. 1 and the transport direction of the printed circuit board P) is referred to as the X direction, and the depth direction of the base 11 (the vertical direction in FIG. 1). Where the direction orthogonal to the X direction) is the Y direction, and the vertical direction in FIG. 3 is the Z direction.

  The conveyor 20 is disposed at the center of the base 11. The conveyor 20 includes a pair of conveyor belts 21 that are circulated and driven in the X direction, and conveys the printed circuit board P on the conveyor belt 21 in the X direction by friction with the belt.

  In the present embodiment, the left side shown in FIG. 1 serves as an entrance, and the printed board P is carried into the machine from the left side shown in FIG. The loaded printed circuit board P is transported to the work position in the center of the base by the transport conveyor 20 and stopped there.

  On the other hand, four parts supply units 13 are provided on the base 11 so as to surround the periphery of the work position. Each of these component supply units 13 is provided with a large number of feeders 15 for supplying electronic components in a horizontal arrangement.

  At the work position, the mounting process for mounting the electronic component supplied through the feeder 15 on the printed circuit board P is performed by the mounting head 73 mounted on the head unit 60, and then the print processing after the mounting process is finished. The substrate P is transported to the right in FIG. 1 through the conveyor 20 and is carried out of the apparatus.

  The drive device 30 is roughly composed of a pair of support legs 41, a head support 51, a Y-axis ball screw 45, a Y-axis motor 47, an X-axis ball screw 55, and an X-axis motor 57. Specifically, as shown in FIG. 1, a pair of support legs 41 are installed on the base 11. Both support legs 41 are located on both sides of the working position, and both extend straight in the Y direction.

  Both support legs 41 are provided with guide rails 42 extending in the Y direction on the upper surfaces of the support legs, and head supports 51 are attached to the left and right guide rails 42 while fitting both ends in the longitudinal direction.

  A Y-axis ball screw 45 extending in the Y direction is attached to the right support leg 41, and a ball nut (not shown) is screwed to the Y-axis ball screw 45. A Y-axis motor 47 is attached to the Y-axis ball screw 45.

  When the Y-axis motor 47 is energized, the ball nut advances and retreats along the Y-axis ball screw 45. As a result, the head support 51 fixed to the ball nut, and the head unit 60 described below, moves along the guide rail 42 in the Y direction. Move in the direction (Y-axis servo mechanism).

  The head support 51 is long in the X direction. A head unit 60 is attached to the head support 51 so as to be movable along the X direction. The head support 51 incorporates an X-axis ball screw 55 extending in the X direction, and a ball nut (not shown) is screwed to the X-axis ball screw 55.

  An X-axis motor 57 is attached to the X-axis ball screw 55. When the motor 57 is energized, the ball nut advances and retreats along the X-axis ball screw 55. As a result, the head unit fixed to the ball nut. 60 moves in the X direction along the head support 51 (X-axis servo mechanism).

  Therefore, by controlling the X-axis motor 57 and the Y-axis motor 47 in combination, the head unit 60 can be moved and operated in the plane direction (XY direction) on the base 11.

  A plurality of mounting heads 73 for mounting electronic components are mounted on the head unit 60 in a row. Each mounting head 73 is configured to be movable up and down with respect to the head unit 60 by rotation around the axis by the R-axis motor 78 and driving of the Z-axis motor 75. Further, each mounting head 73 is configured to be supplied with a negative pressure from a negative pressure means (not shown) so as to generate a suction force at the tip of the head.

  With such a configuration, the X-axis motor 57, the Y-axis motor 47, and the Z-axis motor 75 are operated at a predetermined timing, whereby the electronic components supplied through the feeder 15 are taken out by the mounting head 73 and printed. A process of mounting on the substrate P can be executed.

  In addition, the code | symbol "17" shown in FIG. 1 is a components recognition camera. The component recognition camera 17 is fixed on the base 11 with the imaging surface facing upward. This component recognition camera 17 captures an image (lower surface image) of the electronic component taken out by the mounting head 73 and detects the suction posture of the electronic component by the mounting head 73.

2. Structure of Head Unit 60 and Scan Unit 80 As shown in FIGS. 3 and 4, the head unit 60 includes a support frame 61 and a unit main body 70 fixed to the support frame 61. The support frame 61 is attached to the head support 51 so as to be movable in the X direction. The unit main body 70 includes an intermediate frame 71, a plurality of (in this example, ten) mounting heads 73 attached to the intermediate frame 71 so as to be vertically movable, a Z-axis motor 75, and an R-axis motor 78. Prepare.

  As shown in FIG. 3, the mounting heads 73 are arranged in a line in the X direction (corresponding to “one direction” in the present invention) with respect to the intermediate frame 71. Each mounting head 73 has a shaft shape that is long in the vertical direction, and a nozzle 74 that adsorbs electronic components by negative pressure is provided at the bottom. The Z-axis motor 75 is provided on the upper side of each mounting head 73, and has a structure for moving each mounting head 73 up and down individually. The R-axis motor 78 is a motor that rotates each mounting head 73 around its axis by driving a belt. In this example, two R-axis motors 78 are mounted on the lower part of the unit main body 70. A pair of left and right side walls 76 are attached to the lower part of the intermediate frame 71 so as to be located on the side of the R-axis motor 78.

  Further, as shown in FIG. 4, a scan unit 80 is detachably attached to the head unit 60. As shown in FIGS. 5 and 6, the scan unit 80 includes a scan camera 81, a slide device 90, and a harness unit 130.

  The slide device 90 is a device that slides the scan camera 81 in the X direction, and includes a frame 91 and a slider 111 as shown in FIG. The frame 91 is long in the X direction and has a U-shaped cross section. The frame 91 has the opening facing down. A mounting flange (corresponding to the “mounting portion” of the present invention) 95 is provided on the upper surface wall of the frame 91. The mounting flange 95 is a vertical wall that protrudes upward from the upper surface wall of the frame 91. The mounting flange 95 has a shape that is long in the X direction. In this example, the mounting flange 95 is formed over the entire length of the frame 91 in the X direction. In addition, a closing plate 123 is attached to each side end portion of the frame 91 in the X direction. The closing plate 123 is fixed to the side end surface of the frame 91 with a bolt, and also to the side end surface of the mounting flange 95. Even bolts are fixed.

  The slider 111 is attached to the lower part of the frame 91 via a linear guide 92. A coil 113 is provided on the upper surface of the slider 111, and a magnet 93 is attached inside the frame 91 so as to face the coil 113. The coil 113 and the magnet 93 constitute a linear motor 120. By driving the linear motor 120, the scan camera 81 fixed to the slider 111 together with the slide 111 is slid along the frame 91 in the X direction. It is possible.

  A protective panel 125 is attached to the front wall of the slider 111. The protection panel 125 is attached to a slit 112 formed in the front wall of the slider 111, covers the front of the slider 111, and functions to protect the slider 111 and the linear guide 92 to which the slider 111 is fixed.

  A scan camera 81 is fixed below the slider 111. The scan camera 81 is fixed by bolting a pair of front and rear flanges 115 provided below the slider 111.

  The scan camera 81 has a long shape in the Z direction, and is arranged so as to straddle the slider 111 in the front-rear direction as shown in FIG. The scan camera 81 has a photographing unit 82 on the front side, a frame 84 in the middle, and a camera body 85 on the rear side. The imaging unit 82 on the front side has a U-shaped groove 83 through which a subject (in this example, an electronic component or a position reference member 77) passes. A light incident window 83A is formed on the bottom surface of the U-shaped groove 83, and light from the subject is taken in from the light incident window 83 and then travels backward in the frame 84 to enter the camera body 85. It has a structure.

  The harness unit 130 includes three harnesses 131 that supply power to the coil 113 of the linear motor 120, a first joint panel 133 that fixes the base end portions of the three harnesses 131, and the distal end portions of the three harnesses 131. And a second joint panel 135 attached to. The first joint panel 133 has a long shape in the X direction, and is fixed to a mounting flange 95 formed on the frame 91 of the slide device 90. The second joint panel 135 is fixed to a vertical wall 117 fixed to the rear end portion of the slider 111, and the second joint panel 135 and the harness front end fixed to the second joint panel 135 move integrally with the slider 111. .

  The scan unit 80 is detachably attached to the head unit 60 as a whole as a single unit. That is, the scan camera 81, the slide device 90, and the harness unit 130 are detachably attached as one unit.

  More specifically, a mounting flange 95 is formed on the upper surface of the frame 91 of the slide device 90. On the other hand, a mounted portion 65 that is a counterpart of the mounting flange 95 is provided at the lower back of the support frame 61 constituting the head unit 60. The mounted portion 65 is a flat surface that can be contacted by the mounting flange 95 and is long in the X direction. A screw hole 65 </ b> A is formed in the attached portion 65, and the scan unit 80 can be fixed to the head unit 60 by overlapping the attachment flange 95 on the attached portion 65 and bolting. (See FIG. 8). On the contrary, the scan unit 80 can be removed from the head unit 60 by unfastening the bolts (see FIG. 9).

  Further, as shown in FIG. 9, a stepped portion 68 is provided in the lower portion of the attached portion 65. The step portion 68 is provided corresponding to the frame 91 of the slide device 90, and has a structure in which the frame 91 is fitted from behind.

  In the state where the scan unit 80 is assembled to the head unit 60, as shown in FIG. 8, the imaging unit 82 of the scan camera 81 is located below the head unit 60 and the center of the U-shaped groove 83 of the imaging unit 82. Is coincident with the central axis L of the mounting head 73. Therefore, when the scan unit 80 is moved relative to the head unit 60 in the X-axis direction by driving the linear motor 120, the electronic components sucked and held by the mounting heads 73 arranged in a row are arranged in the U-shaped groove 83. Since it passes through the inside, the electronic component sucked and held by the mounting head 73 can be photographed by the scan camera 81.

  The head unit 60 is provided with a pair of left and right position reference members 77A and 77B. Specifically, as shown in FIG. 3, the head unit 60 is attached to the outer surface side of a pair of left and right side walls 76 attached to the lower part of the intermediate frame 71. The position reference members 77 </ b> A and 77 </ b> B have a shape that is long in the Z direction, and the tips protrude downward from the head unit 60. The position reference members 77A and 77B are located outside the mounting heads 73 arranged in a line. As shown in FIG. 8, the position reference members 77A and 77B have the same position in the Y direction as the center axis L of the mounting head 73. When viewed from the Z direction, the mounting heads are arranged in a line in the X direction. 73 on the same straight line. The front ends of the position reference members 77A and 77B face the U-shaped groove 83 of the photographing unit 82.

  Therefore, when the scan unit 80 is moved relative to the head unit 60 in the X-axis direction, the position reference members 77A and 77B can be photographed in addition to the electronic components sucked and held by the mounting head 73. The position reference members 77 </ b> A and 77 </ b> B have the same shape and are attached to the unit main body 70 symmetrically.

  In addition, on both the left and right sides of the head unit 60, board recognition cameras 170 are attached to the outside of the position reference member 77. The substrate recognition camera 170 is fixed with the imaging surface facing downward with respect to the head unit 60, and is configured to move integrally with the head unit 60. The board recognition camera 170 is provided for recognizing an image of the printed board P at the work position.

2. Electrical configuration of surface mounter 1 The surface mounter 1 includes a controller 200. The controller 200 includes a control unit 210 and a storage unit 220 as shown in FIG. An X-axis motor 57, a Y-axis motor 47, a Z-axis motor 75, and an R-axis motor 78 are connected to the controller 200. The control unit 210 controls the various motors 57, 47, 75, and 78 based on data and programs stored in the storage unit 220, thereby executing a mounting process for mounting electronic components on the printed circuit board P. .

  The controller 200 is connected to the linear motor 120, the scan camera 81, the board recognition camera 170, and the component recognition camera 17, and is based on images captured from the scan camera 81, the board recognition camera 170, and the component recognition camera 17. Then, processing for recognizing an image of the electronic component sucked and held by the mounting head 73 and processing for recognizing a position mark attached on the printed board are executed.

3. Correction Process Associated with Scan Unit Replacement The surface mounting machine 1 uses, as position data for each mounting head 73, an initial value of distance data Lx in the X direction to each mounting head 73 with reference to the origin position Lo of the scan camera 81. It is stored in the storage unit 220. The origin position Lo is the home position (reference position) of the scan camera 81, and is the left end position of the head unit 60 in this example. Also, in this specification, numbers are assigned to the mounting heads 73 in order from the left side of FIG. 11, and “Lx1” is the distance from the origin position Lo to the first mounting head 73-1, “Lx2”. Indicates the distance from the origin position Lo to the second mounting head 73-2.

  Hereinafter, a correction process performed by the control unit 210 when the scan unit is replaced will be described. Here, the case where the scan unit 80 is replaced with a new scan unit 80 will be described as an example.

  The control unit 210 performs image recognition processing of the position reference member 77A with the existing scan camera 81 before the scan unit replacement operation. That is, first, the existing scan camera 81 is moved to the origin position Lo shown in FIG.

  Then, the control unit 210 performs a process of recognizing the position reference member 77A by moving the scan camera 81 from the origin position Lo in the X direction, and based on the obtained recognition result, from the origin position Lo to the position reference member 77A. The X direction distance “Lm0” is acquired, and the data is stored in the storage unit 220 (S10 and S20 shown in FIG. 13).

  Thereafter, the operator performs an operation of replacing the existing scan unit 80 with a new scan unit 80 (S30). When the replacement operation of the scan unit 80 is completed, the control unit 210 recognizes an image of the position reference member 77A with the new scan camera 81 after replacement, in the same manner as performed for the existing scan camera 81. I do. That is, first, the exchanged scan camera 81 is moved to the origin position Lo shown in FIG. And the process which recognizes the position reference member 77A by moving the scan camera 81 after exchange to the X direction from the origin position Lo is performed, and the distance of the X direction from the origin position Lo to the position reference member 77A based on the recognition result “Lm1” is acquired (S40 and S50 shown in FIG. 13).

After that, the control unit 210 compares the distance “Lm0” to the position reference member 77A before replacement with the distance “Lm1” to the position reference member 77A after replacement, and calculates the distance change amount α (S60).
α = Lm1−Lm0 (1) The sign of “α” is “positive” when Lm1> Lm0, and “negative” when Lm1 <Lm0.

  Then, the control unit 210 performs a process of correcting the distance Lx in the X direction from the origin position Lo of the scan camera 81 to each mounting head 73 based on the calculated change amount α. Specifically, as shown in FIG. 12, the distance from the origin position Lo to the first mounting head 73-1 is corrected from the distance “Lx1” before the replacement to “Lx1 + α”. Similarly, the distance to the second mounting head 73-2 is corrected from “Lx2” to “Lx2 + α”. Then, the distance to the remaining mounting head 73 is similarly corrected (S70 shown in FIG. 13).

  When the printed circuit board P is produced, when the image of the electronic component sucked and held by the mounting head 73 is recognized, the control unit 210 recognizes the position of each mounting head 73 in the X direction based on the corrected distance. The electronic component sucked and held by each mounting head 73 is photographed. That is, the control unit 210 captures an image of the electronic component sucked and held by the first mounting head 73-1 when the scan camera 81 moves “Lx1 + α” from the origin position Lo. Further, at the time of moving “Lx2 + α” from the origin position Lo, the electronic component sucked and held by the second mounting head 73-2 is photographed, and the remaining electronic components are photographed similarly.

  From the above, after the replacement of the scan unit 80, the relative positional relationship in the X direction between the scan camera 81 and each mounting head 73 can be maintained in the same relationship as before the replacement. More specifically, when the scan unit 80 is replaced, the origin position Lo of the scan camera 81 is in the X direction compared to before the replacement due to errors in the mounting position of the scan unit 80 with respect to the head unit 60 and variations in component accuracy. There may be deviation.

  If the origin position Lo deviates in the X direction, the distance Lx from the origin position Lo to each mounting head 73 changes compared to before the replacement. Therefore, when the electronic component is recognized by the scan camera 81, compared to before the replacement, The position of the electronic component is recognized in the X direction.

  In this regard, in the surface mounting machine 1, the position reference member 77 </ b> A is provided in the head unit 60. The position reference member 77A is a position-invariant member fixed to the head unit 60, and the position is constant even if the scan unit 80 is replaced. Therefore, the position reference member 77A is image-recognized using the scan camera 81 before and after the replacement of the scan unit 80, and the distance to the position reference member 77A is compared, thereby shifting the position of the origin position Lo (change amount α ). Then, the distance Lx in the X direction from the origin position Lo of the scan camera 81 to each mounting head 73 is corrected based on the obtained change amount α. Therefore, after the scan unit 80 is replaced, the relative positional relationship in the X direction between the scan camera 81 and each mounting head 73 can be kept the same as that before the replacement. It is possible to acquire the same image as before replacement, and there is an advantage that reproducibility is high. In addition to the position in the X direction, it is possible to recognize the position in the Y direction from the recognition result of the position reference member 77A. Therefore, the amount of displacement of the position of the scan camera 81 in the Y direction (the amount of change in the position of the Y direction) is detected from the result of image recognition of the position reference member 77A using the scan camera 81 before and after the replacement of the scan unit 80. In addition to correcting the distance Lx in the X direction, it is also possible to correct a shift in the position of the scan camera 81 in the Y direction (that is, a shift in the position of the origin position Lo in the Y direction). In addition, the position correction in the Y direction may be performed by correcting the position of the electronic component recognized by the scan camera 81 in the Y direction after the replacement by the amount of deviation of the position of the scan camera 81 in the Y direction.

4). Explanation of Effects Both the component recognition camera 17 and the scan camera 81 take images of the electronic components sucked and held by the mounting head 73, and have common uses. However, since the component recognition camera 17 is fixed, the camera has a large field of view and can capture a large electronic component. However, after the electronic component is attracted, the head unit 60 needs to be moved to the camera installation position. And the moving distance of the head unit 60 becomes longer. On the other hand, the scan camera 81 is not suitable for photographing a large electronic component because the field of view of the camera is small. However, the scan camera 81 can photograph the electronic component by using time to move the adsorbed electronic component onto the printed circuit board. Therefore, the moving distance of the head unit 60 can be shortened.

  Thus, the fixed type and the scan type have different merits and demerits. When only the fixed type is used, when only the scan type is used, both the fixed type and the scan type may be used. It was required to make it easy to attach and detach. In this respect, the surface mounter 1 can answer the above request because the scan unit 80 can be easily attached to and detached from the head unit 60. Further, since it is necessary to replace the scan unit 80 at the time of failure, the replacement operation can be performed relatively easily.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) Although the right position reference member 77A shown in FIG. 11 is used as a reference for the position of the mounting head 73 in the above embodiment, the left position reference member 77B shown in FIG. 11 may be used. In the above-described embodiment, an apparatus using the linear motor 120 is illustrated as an example of the slide apparatus 90. However, a ball screw mechanism using a motor as a drive source may be used. In the said embodiment, although the attachment flange 95 was illustrated as an example of an attachment part, the attachment part should just be a structure which has a wall surface which overlaps with a to-be-attached part. Moreover, in the said embodiment, although the attachment flange 95 was bolted to the to-be-attached part 65, the fixing method of other than that (for example, clamp) may be sufficient.

  (2) Further, the position reference member 77A (77B may be used), for example, when switching from the scan unit 80 to the component recognition camera 17 fixed to the base 11. That is, since the data of the distance to each mounting head 73 with respect to the position reference member 77A is invariant data regardless of the camera to be used, as shown in FIG. 14, the position reference member 77A is used as a reference. If data of the distances Lc1, Lc2, Lc3... To each mounting head 73 is stored in the storage unit 220 in advance, each mounting head is always based on the position reference member 77A even if the camera type is switched. By grasping the distance Lc up to 73, the electronic component can be recognized under the same conditions as before replacement. That is, the position of the electronic component is not recognized by being displaced in the X direction before and after camera replacement.

Claims (1)

A surface mounter for mounting electronic components on a printed circuit board,
The base,
A head unit having a plurality of mounting heads arranged in one direction;
A driving device for moving the head unit in a plane direction on the base;
A scan unit provided in the head unit,
The scan unit is
A scan camera for photographing the electronic component sucked and held by the mounting head;
A slide device for sliding the scan camera along the one direction;
An attachment portion provided in the slide device,
By attaching and detaching the mounting portion of the slide device from the mounted portion provided in the head unit, the entire scan unit including the scan camera and the slide device is configured to be attached and detached from the head unit .
In the head unit, a position reference member that can be recognized by the scan camera is provided in line with the plurality of mounting heads,
Based on the result of recognizing the position reference member using the scan camera before and after the replacement of the scan unit, the distance data in the one direction from the origin position of the replaced scan camera to the mounting head is corrected. Surface mounter equipped with a control unit .

Images