JP2008192904A - Surface mounting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface mounting apparatus which can judge whether a component is held by a nozzle in a correct posture, holds again the component when a holding posture is not correct and can make the holding posture to be normal. <P>SOLUTION: A component posture correcting means 22 for correcting the posture of the component 34 to a normal posture when a judging means judges that the posture of the component 34 measured by a component posture measuring means measuring the posture of the component 34 held by the nozzle is not normal is arranged in the apparatus. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a surface mounting device, and more particularly to a surface mounting device having a correction function for checking the posture of a component sucked by a suction nozzle and adjusting the posture of the component.

  FIG. 14 is a perspective view showing a schematic configuration of a surface mounting apparatus 100 which is an example of a conventional surface mounting apparatus.

  Reference numeral 102 denotes, for example, a circuit board on which printed wiring is applied. The circuit board 102 is transferred to a predetermined position on the surface mounting apparatus by a belt conveyor (not shown) of the support means 104 and supported in a horizontal state by the support means 104.

  In the vicinity of the circuit board 102, a plurality of tape feeders 106 are disposed at predetermined positions, for example, with the circuit board 102 interposed therebetween (the tape feeder 106 on the rear side of the circuit board 102 in the figure is not shown because the figure is complicated). ) The tape feeder 106 supports a component reel 108 made of, for example, paper or plastic. The component reel 108 is formed with recesses at predetermined intervals, and electronic components such as IC and LSI are accommodated in the recesses, and the respective electronic components from the component reel 108 to the tape feeder 106 are stored. Parts can be sent out. A plurality of tape feeders 106 that support the component reels 108 are detachable from the surface mounting apparatus 100 and are arranged side by side.

  The XY moving mechanism 112 includes an X-axis moving mechanism 112a and a Y-axis moving mechanism 112b. The X-axis moving mechanism 112a supports the XY moving unit 113 so as to be slidable in the X direction in the drawing, and drives the XY moving unit 113 in the X direction in the drawing by an X direction driving means (not shown). The Y-axis moving mechanism 112b supports the X-axis moving mechanism 112a so as to be slidable in the Y direction in the figure, and drives the X-axis moving mechanism 112a in the Y direction in the figure by Y-direction driving means (not shown). For this reason, the XY moving unit 113 is configured to be XY driven. Fixed to the XY moving unit 113 is a head unit 114 that holds an electronic component and mounts the electronic component at a predetermined position on the circuit board 102.

  In the actual component mounting operation, the head unit 114 sucks and removes electronic components from the component supply unit of the tape feeder 106, moves in the X and Y directions while being sucked and held, and is supported by the support means 104. The electronic component is mounted by releasing the suction at a predetermined position.

  However, the posture of the adsorbed electronic component 110 may not be normal as shown in FIGS. 15A, 15B, and 15C, and accurate mounting on the circuit board 102 may not be possible. . Note that FIG. 15D illustrates a case where the attracted electronic component has a normal posture.

  For this reason, Patent Document 1 proposes a technique for measuring a suction state of a component by laser measurement, discarding the component if the suction state is not normal, and sucking a new same type of component by shifting the suction position. Yes.

Japanese Patent No. 3053753

  However, in the technique described in Patent Document 1, a part that has caused a suction abnormality is discarded without being reused, and thus, resources are wasted.

  In addition to the nozzle that holds the component by the suction force of the vacuum generator, the type of nozzle 82 that holds the component 80 from both sides with holding claws 82a as shown in FIG. is there. When mounting a component using the nozzle 80, as shown in FIG. 2A, when the tip of the component 80 comes into contact with the end of the tray 83, the holding posture of the component 80 may be inclined. If an attempt is made to return the component to the tray 83 while maintaining the holding posture, the component 80 may not fit in the tray 83 as shown in FIG. 3, and the component 80 may be damaged or the nozzle 82 may be damaged. FIG. 2B shows a case where the component holding posture is normal.

  In addition, in the conventional technology, since the posture of a component once held cannot be changed, even if the component holding posture is bad, if the component is normally recognized, the component is moved onto the board. As shown in FIG. 4A, the lead 84 of the component 80 is not connected to the center of the electrode 88 on the substrate 86, which may cause mounting displacement. FIG. 4B shows a case where mounting is performed normally.

  The present invention has been made in view of such problems, it can be determined whether or not the component is held in the nozzle in the correct posture, if the holding posture is not correct, the component is held again, It is an object of the present invention to provide a surface mount device capable of normalizing a holding posture.

  The present inventor has found that the object can be achieved by providing a component posture correction station for correcting the holding posture of the component, and has led to the present invention.

  That is, the surface mounting apparatus according to the present invention includes a head that moves in a plane direction, a nozzle for holding a component arranged in the head, a measuring unit for measuring the posture of the component held by the nozzle, A determination unit that determines whether the posture of the component measured by the measurement unit is normal, a moving unit that moves the head in a plane direction, a lifting unit that moves the nozzle up and down, and a component that holds the component with the nozzle. In order to mount the component at a predetermined component mounting position, in the surface mounting apparatus provided with the control unit for controlling the elevating unit and the moving unit, the posture of the component measured by the measuring unit is determined by the determining unit An attitude correction unit is provided for correcting the attitude of the component to a normal attitude when it is determined that the part is not normal.

  As the posture correction means, for example, it has a cradle on which the component is temporarily placed when the holding by the nozzle is released, and corrects the posture of the component placed on the cradle. Therefore, it is possible to use posture correction means having a component fixing claw for the purpose.

  As the surface mount device, a feeder bank for attaching a tape feeder for supplying components, a knock cylinder for driving up and down to feed a component storage tape attached to the tape feeder, and driving the knock cylinder up and down And a knock cylinder control means for outputting a knock cylinder signal for controlling the knock cylinder drive means, and the posture correction means is attached to the feeder bank, The component fixing claw may be opened and closed by the knock cylinder signal.

  According to the present invention, it is possible not only to prevent a recognition error and mounting deviation by the component imaging camera in advance by checking whether the component posture is normal when the component is held by the nozzle, and further, the component posture Therefore, the component posture can be corrected, and recognition errors and mounting deviations caused by the component imaging camera can be extremely reduced.

  Moreover, even when returning the held component to the component supply unit, it is possible to return the component after correcting the component posture, so that stable return can be performed without damaging the component and the nozzle.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 5 is a plan view schematically showing the surface mounting apparatus 10 as an example of the embodiment according to the present invention.

  The surface mounting apparatus 10 includes a head unit 12, an XY moving unit 14, an X axis moving mechanism 16a, a Y axis moving mechanism 16b, a supporting unit 18, a feeder bank 20, a component posture correcting unit 22, and a component imaging. The camera 24 and the nozzle holder 26 are provided.

  The head unit 12 is fixed to the XY moving unit 14 and can move in the plane direction. The XY moving unit 14 is XY-driven in the plane direction by the X-axis moving mechanism 16a and the Y-axis moving mechanism 16b. The X-axis moving mechanism 16a supports the XY moving unit 14 so as to be slidable in the X direction in the drawing, and drives the XY moving unit 14 in the X direction in the drawing by the X direction driving means 74a (see FIG. 11). The Y-axis moving mechanism 16b supports the X-axis moving mechanism 16a so as to be slidable in the Y direction in the figure, and drives the X-axis moving mechanism 16a in the Y direction in the figure by the Y-direction driving means 74b (see FIG. 11). For this reason, the XY moving unit 14 is configured to be XY driven.

  The support means 18 conveys the circuit board 28 by a belt conveyor (not shown), and supports the circuit board 28 in a horizontal state at a predetermined position.

  A plurality of tape feeders 30 are attached to the feeder bank 20 in parallel. The tape feeder 30 is a device that supplies components from the component supply tape to the surface mounting apparatus 10.

  The component orientation correcting means 22 is attached to the feeder bank 20 and has a cradle 22a on which a component can be temporarily placed as shown in FIG. A component fixing claw 22b for correcting the posture of the component is provided.

  The component imaging camera 24 images the component held by the holding claw 44b of the nozzle 44 from below, and outputs the imaging data to the control unit 70 (see FIG. 11). Based on the input imaging data, the control unit 70 rotates the nozzle 44 around the rotation axis 44 a to adjust the orientation of the components mounted on the circuit board 28.

  The nozzle holder 26 is provided between the feeder bank 20 and the support means 18 in the upper part of FIG. 5 and stores various nozzles corresponding to the type of component.

  The tray holder 32 is attached to the feeder bank 20 in the upper part of FIG. 5, and a tray 36 in which a component 34 to be mounted is stored is placed. The component 34 placed and supplied on the tray 36 is a large component such as a connector component, and the component supplied from the tape feeder 30 is a small component.

  Next, the head unit 12 will be described in detail with reference to FIG.

  The frame 42 of the head unit 12 is attached to the XY moving unit 14. Therefore, the head unit 12 can move in the XY directions, and can move between the component supply unit of the tape feeder 30 and the circuit board 28 supported by the support means 18.

  In the drawing, reference numeral 44 denotes a nozzle as a component holding portion connected to the tip (lower end in the drawing) of a rotating shaft 44a whose axis is orthogonal to the XY plane. At the lower part of the nozzle 44, a holding claw 44b for holding the component 34 is provided. The nozzle 44 having the holding claws 44b is used when a large component such as a connector component is mounted.

  The rotating shaft 44 a is supported by a bracket 46 and is connected to an output shaft of a nozzle rotating motor 48 as a rotating means fixed to the bracket 46.

  Therefore, when the nozzle rotation motor 48 is driven to rotate, the component 34 held by the nozzle 44 rotates about the rotation shaft 44a.

  A nut 49 is fixed to the bracket 46, and a ball screw 50 extending in the illustrated vertical direction (Z direction) is screwed to the nut 49. The ball screw 50 is connected to an output shaft of a nozzle vertical movement motor 52, and the nozzle vertical movement motor 52 is fixed to a bracket 54. The bracket 54 is fixed to the frame 42 attached to the XY moving unit 14.

  Therefore, when the nozzle vertical movement motor 52 is rotationally driven in the positive direction or the negative direction, this rotational movement is converted into a linear movement by the ball screw 50 and the nut 49, and together with the bracket 46, the nozzle rotation motor 48, the rotary shaft 44a, the nozzle 44, The holding claw 44 b is raised or lowered while being guided by a guide member 56 fixed to the frame 42.

  The head unit 12 having the above-described mechanism takes out the components 34 accommodated in the tray 36 on the tray holder 32 and moves in the XY direction while holding the circuit board 28 supported by the supporting means 18. The part 34 is mounted by releasing the pinching at a predetermined position.

  The head unit 12 is provided with a component posture measuring means 58. The component orientation measuring means 58 includes a light emitting portion 58a and a light receiving portion 58b that are opposed to each other with the rotating shaft 44a, the nozzle 44, and the holding claw 44b interposed therebetween and each end portion is fixed to the bracket 54. The light emitting unit 58a emits parallel laser light to the component 34 held by the holding claw 44b, and the light receiving unit 58b arranged oppositely receives the light to check the presence of the component 34, and the posture of the component 34 is normal. Measure whether or not.

  Next, the mounting operation during the production operation of the surface mounting apparatus 10 will be described. The parts to be mounted are connector parts that are large parts.

  First, after holding the connector part 34a housed in the tray 36 on the tray holder 32 with the holding claws 44b, the light emitting portion 58a emits parallel laser light to the parts 34 held by the holding claws 44b, The light receiving portion 58b arranged oppositely receives light and confirms the presence or absence of the connector component 34a.

  Next, the position of the nozzle 44 in the Z direction so that the laser beam 60 is irradiated immediately below the position of the lower surface of the connector part 34a when the posture of the connector part 34a sandwiched between the holding claws 44b is assumed to be normal. Adjust. Here, the dimension data of the connector part 34 a is previously input to the control unit 70 by the part dimension input means 73. Then, it is determined whether or not the posture of the connector part 34a is normal based on whether the laser beam is blocked and a shadow is generated. As shown in FIG. 7A, if the laser beam is not blocked and no shadow is produced, the connector component 34a is determined to be normal, and the laser beam is blocked and shaded as shown in FIG. 7B. If this occurs, it is determined that the posture of the connector part 34a is abnormal.

  When it is determined that the posture of the connector part 34a is abnormal, there is a possibility that the connector part 34a is inclined obliquely, and therefore the process shifts to a part posture correction process.

  In the component posture correction process, first, the head portion 12 is moved onto the cradle 22a of the component posture correction means 22 to release the holding claw 44b, and the connector part 34a is moved to the cradle 22a (see FIG. 8).

  As shown in FIG. 8, the component posture correcting means 22 includes a cradle 22 a and a component fixing claw 22 b and is attached to the feeder bank 20.

  The component fixing claw 22b is opened and closed by the vertical movement of the knock cylinder 30a that provides a driving force for feeding the component storage tape in the tape feeder 30. Specifically, a micro switch 22C for opening and closing the component fixing claw 22b is provided in the cradle 22a. As shown in FIG. 9 when the component posture correcting means 22 is viewed from the side, the knock cylinder 30a The microswitch 22C is pushed by the up and down movement, turned on and off, and the component fixing claw 22b opens and closes. The vertical movement of the knock cylinder 30a is controlled by the knock cylinder driving means 76 (see FIG. 11) driven by a knock cylinder signal from the control unit 70 (see FIG. 11). FIG. 10 is an enlarged view showing a part where the component is fixed to the component fixing claw 22b, FIG. 10A is a plan view showing a state where the component fixing claw 22b is opened, and FIG. 10B is a component fixing. It is a top view which shows the state which the nail | claw 22b closed. FIG. 10C is a side view of the state where the component fixing claws 22b are closed as seen from the side. Reference numeral 34b is a lead of the connector component 34a.

  Next, a control flow of the surface mount device 10 as an example of the embodiment according to the present invention will be described. FIG. 11 is a block diagram in which control means are extracted.

  The control unit 70 controls the X direction driving unit 74a and the Y direction driving unit 74b to control the position of the head unit 12 in the plane direction (XY direction), and controls the nozzle vertical movement motor 52 to control the nozzle 44 in the Z direction. , The nozzle rotation motor 48 is controlled to control the rotation of the rotating shaft 44a, the knock cylinder driving means 76 is controlled to control the opening and closing of the component fixing claw 22b, and the component imaging camera 24 is controlled. Then, the posture of the connector part 34a is imaged.

  The control for determining whether or not the component posture is normal and the control of the component posture correction process after it is determined that the component posture is not normal will be further described. After the connector part 34a is sandwiched and held from the tray 36 by the holding claws 44b and the nozzle 44 is raised, the control unit 70 instructs the part posture measuring means 58 to irradiate the laser light from the light emitting unit 58b. As a result, data on the posture of the connector part 34 a obtained by the light receiving unit 58 a is output to the determination means 72. The determination unit 72 determines whether or not the component posture is normal based on the orientation data of the connector component 34 a and the dimension data of the connector component 34 a input from the component dimension input unit 73 in advance. The determination result is output to the control unit 70, and when the component posture is normal, the control unit 70 causes the X-direction drive unit 74a, the Y-direction drive unit 74b, the nozzle vertical movement motor 52, the nozzle rotation motor 48, and the component imaging camera 24. And the operation for mounting the connector part 34a on the circuit board 28 is performed as it is. When the component posture is not normal, the control unit 70 controls the X-direction drive unit 74a, the Y-direction drive unit 74b, and the nozzle vertical movement motor 52 to place the connector component 34a on the cradle 22a of the component posture correction unit 22. And the opening and closing of the component fixing claw 22b of the component posture correcting unit 22 is controlled by controlling the knock cylinder driving unit 76 to correct the posture of the connector component 34a. After the posture of the connector part 34a is corrected, the control unit 70 controls the X-direction driving means 74a, the Y-direction driving means 74b, the nozzle vertical movement motor 52, the nozzle rotation motor 48, and the part imaging camera 24 to control the connector part 34a. The operation for mounting the circuit board on the circuit board 28 is performed.

  Next, the mounting operation (FIG. 12) and the component posture correction process (FIG. 13) during the production operation of the surface mounting apparatus 10 will be further described using a flowchart.

  FIG. 12 is a flowchart showing the flow of the mounting operation during the production operation of the surface mounting apparatus 10.

  First, the head unit 12 is moved immediately above the connector component 34a to be mounted, and the connector component 34a is sandwiched between the holding claws 44b (step S1). After the head part 12 is lifted with the holding claw 44b sandwiching the connector part 34a, the connector part 34a is irradiated with laser light from the light emitting part 58a (step S2), and whether or not the laser light is blocked by the connector part 34a. It is confirmed and it is determined whether or not the connector part 34a is sandwiched between the holding claws 44b (step S3). If the connector part 34a is not sandwiched between the holding claws 44b, the process returns to step S1. When the connector part 34a is sandwiched between the holding claws 44b, the laser light is irradiated directly below the position of the lower surface of the connector part 34a when the posture of the connector part 34a sandwiched between the holding claws 44b is assumed to be normal. Thus, the position of the nozzle 44 in the Z direction is adjusted (step S4). It should be noted that the dimension data of the connector part 34a is input to the control unit 70 by the part dimension input means 73 in advance. And it is judged whether the attitude | position of the connector component 34a is normal by whether a laser beam is interrupted | blocked and a shadow arises (step S5).

  When the posture of the connector component 34a is not normal, a component posture correction process is performed (step S6), and then component recognition by the component imaging camera 24 is performed (step S7). If the posture of the connector component 34a is normal, component recognition by the component imaging camera 24 is performed without performing component posture correction processing (step S6) (step S7).

  It is determined whether or not a component recognition error has occurred (step S8). If no component recognition error has occurred, the connector component 34a is mounted at a predetermined position on the circuit board 28 (step S9A), and the mounting is completed. . If a component recognition error occurs, the connector component 34a is discarded without being mounted (step S9B), and the mounting is terminated.

  FIG. 13 is a flowchart showing the flow of component orientation correction processing of the surface mounting apparatus 10.

  First, the head unit 12 is moved so that the connector component 34a is positioned immediately above the cradle 22a of the component posture correcting means 22 (step S11). Next, the nozzle 44 is lowered to release the holding claw 44b, and the connector part 34a is placed on the cradle 22a (step S12). The connector component 34a placed on the cradle 22a is fixed by the component fixing claw 22b, and the posture of the connector component 34a is corrected (step S13). Thereafter, the nozzle 44 descends immediately above the component (step S14), and after the fixing by the component fixing claw 22b is released (step S15), the component is sandwiched by the holding claw 44b (step S16). Then, the nozzle 44 is raised in a state where the component is sandwiched between the holding claws 44b (step S17), and the component posture correction process is completed.

  In the measurement of the posture of the connector part 34a sandwiched between the holding claws 44b, the projected thickness of the connector part 34a is measured by scanning the laser beam up and down, and compared with the actual thickness of the connector part 34a. It may be determined whether or not the posture of the connector part 34a is normal. Further, for example, the nozzle 44 is moved up and down while the component is sandwiched between the holding claws 44b, the projected thickness of the connector component 34a is measured, and the connector component 34a is compared with the actual thickness of the connector component 34a. It may be determined whether the posture is normal.

A diagram showing a type of nozzle that holds components from both sides with holding claws. It is a figure showing the state where the part is held by the nozzle. (A) In the case of an abnormal posture, (B) In the case of a normal posture The figure which shows the situation where parts are returned to a tray with the slant holding posture The figure shows the situation during and after mounting the components on the board. (A) When mounted in an abnormal posture, (B) When mounted in a normal posture The top view which shows the outline of the surface mounting apparatus of an example of embodiment which concerns on this invention The perspective view which shows the head part of the said surface mounting apparatus It is a figure showing the situation where the component posture is measured by laser light. (A) When the component posture is normal, (B) When the component posture is abnormal The perspective view which shows the outline of a component attitude | position correction | amendment means Schematic side view of component orientation correction means It is the figure which expands and shows the site | part by which components are fixed to the component fixing claw 22b, (A) The top view which shows the state which the component fixing claw opened, (B) The top view which shows the state which the component fixing claw closed, ( C) Side view showing a state in which the component fixing claws are closed. The block diagram which extracted the control means of the said surface mounting apparatus Flowchart showing the flow of the mounting operation during the production operation of the surface mounting apparatus The flowchart which shows the flow of the component attitude | position correction process of the said surface mounting apparatus. The perspective view which shows schematic structure of the surface mounting apparatus which is an example of the conventional surface mounting apparatus In the perspective view which shows the attitude | position of the adsorbed electronic component, (A), (B), (C) In the case of an abnormal attitude, (D) In the case of a normal attitude

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Surface mount apparatus 12 ... Head part 14 ... XY moving part 16a ... X-axis moving mechanism 16b ... Y-axis moving mechanism 18 ... Support means 20 ... Feeder bank 22 ... Component attitude | position correction means 22a ... Receiving base 22b ... Component fixing claw 22c ... Micro switch 24 ... Part imaging camera 26 ... Nozzle holder 28 ... Circuit board 30 ... Tape feeder 30a ... Knoc cylinder 32 ... Tray holder 34 ... Part 34a ... Connector part 34b ... Lead 36 ... Tray 42 ... Frame 44 ... Nozzle 44a ... Rotation Shaft 44b ... Holding claw 46 ... Bracket 48 ... Nozzle rotation motor 49 ... Nut 50 ... Ball screw 52 ... Nozzle vertical motion motor 54 ... Bracket 56 ... Guide member 58 ... Component posture measuring means 58a ... Light receiving part 58b ... Light emitting part 60 ... Laser Light 70 ... Control unit 72 ... Determination means 73 ... Goods dimension input means 74a ... X-direction drive unit 74b ... Y-direction driving means 76 ... knock cylinder drive means 80 ... Component 82 ... nozzle 82a ... holding claw 83 ... tray

Claims (3)

A head that moves in a plane direction, a nozzle for holding a component arranged in the head, a measuring unit for measuring the posture of the component held by the nozzle, and the posture of the component measured by the measuring unit. Determining means for determining whether or not it is normal, moving means for moving the head in a plane direction, elevating means for raising and lowering the nozzle, and holding the part by the nozzle and mounting the part at a predetermined part mounting position In order to do so, in the surface mounting device comprising a controller for controlling the lifting means and the moving means,
A surface provided with posture correcting means for correcting the posture of the component to a normal posture when the posture of the component measured by the measuring device is determined to be not normal by the determining device Mounting device.   The posture correcting means has a cradle on which the component is temporarily placed when the holding by the nozzle is released, and a component for correcting the posture of the component placed on the cradle. The surface mounting apparatus according to claim 1, further comprising a fixing claw. The surface mount device includes a feeder bank for attaching a tape feeder for supplying components, a knock cylinder that is driven up and down to feed a component storage tape attached to the tape feeder, and a drive that drives the knock cylinder up and down. A knock cylinder driving means for controlling the knock cylinder and a knock cylinder control means for outputting a knock cylinder signal for controlling the knock cylinder driving means,
The surface mounting apparatus according to claim 2, wherein the posture correcting unit is attached to the feeder bank, and the component fixing claw is opened and closed by the knock cylinder signal.

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