JP2013033780A - Component supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the intermittent feed of storage tapes by reducing the feed resistance of the storage tapes by a sprocket as much as possible.SOLUTION: A suppressor 23 presses storage tapes C having feed holes Cb meshed with feed dogs 36H of a sprocket 36 from the upper side so as not to be detached therefrom. Then, a PTFE layer 23S as a friction reduction layer is formed in portions of a horizontal piece 23B and a horizontal piece 23A of the suppressor 23 capable of contacting with the storage tapes C and carrier tapes Cc, and the feeding resistance of the storage tapes C by the sprocket 36 is reduced.

Description

  According to the present invention, the parts storage unit for storing the electronic parts peels off the cover tape of the storage tape formed at a predetermined interval, and is fitted so that it is pressed by the suppressor so as not to be removed from the feed hole of the carrier tape. The present invention relates to a component supply device that supplies an electronic component stored in the component storage portion to a component take-out position by rotating a sprocket having teeth on a support shaft.

  This type of component supply device is disclosed in, for example, Patent Document 1 and the like, but the feed teeth are engaged with feed holes formed in the carrier tape, and the storage tape is intermittently fed by a sprocket that rotates about a support shaft. However, sometimes the frictional resistance between the carrier tape and the suppressor is large, the feeding resistance becomes large during intermittent feeding of the storage tape, the load is excessively applied, and the feed dog widens the feed hole.

JP-A-2005-228847

  Then, variation occurs in the amount of storage tape feed, the component extraction position is divided, and in the extraction from the component supply device by the suction nozzle of the electronic component mounting device, the suction surface different from the original is sucked, When so-called “standing adsorption” occurs, there may be a problem that the taken-out electronic component is disposed of.

  Accordingly, an object of the present invention is to reduce the feeding resistance of the storage tape by the sprocket as much as possible, stabilize the intermittent feeding of the storage tape, and solve the above-described problems.

  For this reason, according to the first aspect of the present invention, the component storage portion for storing the electronic component peels off the cover tape of the storage tape formed at a predetermined interval and is not pressed by the suppressor to be removed from the carrier tape feed hole. In a component supply device for supplying electronic components stored in the component storage section to a component pick-up position by rotating a sprocket having a fitted feed dog with a support shaft as a fulcrum, friction resistance with the storage tape or carrier tape In order to reduce the friction, a friction reducing layer is formed on the back surface of the suppressor.

  The present invention can stabilize the intermittent feeding of the storage tape by reducing the feeding resistance of the storage tape by the sprocket as much as possible. That is, when the feed tape is intermittently fed by the sprocket which rotates with the feed dog meshing with the feed hole formed in the carrier tape, the feed dog widens the feed hole when the feed resistance becomes too high and the load is excessively applied. As a result, the feeding amount of the storage tape varies, the parts take-out positions vary, and a suction surface different from the original is picked up when picking up from the parts supply unit by the suction nozzle of the electronic component mounting device. However, the so-called “standing adsorption” occurs, and there is a problem that the taken-out electronic component is disposed of. However, the intermittent feeding of the storage tape can be stabilized, and this problem can be solved.

It is a top view of an electronic component mounting apparatus. It is a partial side view of the component supply unit in a state where the suppressor is closed. It is a partial side view of the component supply unit in a state where the suppressor is opened. It is a fragmentary top view of a component supply unit. It is a fragmentary longitudinal cross-sectional view of a component supply unit.

  FIG. 1 is a plan view of an electronic component mounting apparatus. An electronic component mounting apparatus main body 1 includes a machine base 2, a conveyor unit 3 extending in the left-right direction at the center of the machine base 2, and a front of the machine base 2. Two sets of component mounting portions 4 and 4 and two sets of component supply portions 5 and 5 are provided respectively at a portion (lower side in the drawing) and a rear portion (upper side in the drawing). In each of the component supply units 5, a plurality of component supply units 6 as electronic component supply devices are incorporated side by side and detachably on the feeder base 19 to constitute an electronic component mounting device. The feeder base 19 may be simply fixed to the electronic component mounting apparatus main body 1 or may be attached to the electronic component mounting apparatus main body 1 in a detachable manner with a carriage.

  The conveyor unit 3 includes a central set table 8, a left supply conveyor 9, and a right discharge conveyor 10. The printed circuit board P as a substrate is supplied from the supply conveyor 9 to the set table 8, and is fixedly set at a predetermined height on the set table 8 so as to receive mounting of electronic components. Then, the printed circuit board P on which the mounting of the electronic components is completed is discharged from the set table 8 to the downstream device via the discharge conveyor 10.

  Each component mounting portion 4 is provided with an XY stage 12 on which a head unit 13 is movably mounted, as well as a component recognition camera 14 and a nozzle stocker 15. Mounted on the head unit 13 are a mounting head 16 for sucking and mounting electronic components, and a substrate recognition camera 17 for recognizing the position of the printed circuit board P.

  In each XY stage 12, the beam 12A is moved in the Y direction by the Y axis drive motor, and the head unit 13 is moved in the X direction along the beam 12 by the X axis drive motor. As a result, the head unit 13 is moved in the XY direction. Will move.

  The component supply unit 6 is equipped with a storage tape C covered with a cover tape Ca in which a large number of electronic components D are stored at regular intervals in each storage portion Cd formed of a recess of the carrier tape Cc. By intermittently feeding and peeling the cover tape Ca from the carrier tape Cc, the electronic components D are supplied one by one to the component extraction position PU of the component supply unit 6 (see FIGS. 4 and 5). It is taken out by the head unit 13.

  The operation based on the mounting data stored in the storage unit of the electronic component mounting apparatus main body 1 is performed by first driving the XY stage 12 so that the head unit 13 faces the component supply unit 6 and then the suction nozzle provided on the mounting head 16. The desired electronic component D is taken out by lowering 18. Subsequently, after the suction nozzle 18 is raised, the XY stage 12 is driven to move the electronic component to a position directly above the component recognition camera 14, and the electronic component D sucked and held by the suction nozzle 18 is imaged, and the suction is performed. Recognize the posture and displacement relative to the suction nozzle 18. Next, after the mounting head 16 is moved to the position of the board P on the set table 8 and the position of the board P is recognized by the board recognition camera 17, based on the recognition result by the component recognition camera 14 and the board recognition camera 17, The X-axis drive motor of the XY stage 12, the Y-axis motor and the θ-axis drive motor of the suction nozzle 18 are corrected and moved to mount the electronic component on the printed circuit board P.

  In FIG. 2, the component supply unit 6 includes a feeder main body 21 and a storage tape C that is sequentially delivered in a state of being wound around a tape supply reel that is rotatably mounted on the feeder main body 21 to the component extraction position PU of the electronic component D. It comprises a tape feeding mechanism (tape feeding device) 22 for intermittent feeding and two cover tape peeling mechanisms (not shown) for peeling off the cover tape Ca of the storage tape C before the component take-out position.

  Then, the storage tape C fed out from the tape supply reel passes through the passage formed by the concave groove 21A formed in the feeder main body 21 on the flat portion where the concave groove is formed, and the storage portion of the carrier tape Cc. Both upper surface flange portions other than Cd are guided to the part extraction position so as to dive under the suppressor 23 while being guided. The suppressor 23 is provided with an opening 23E for taking out parts. The suppressor 23 is formed with a slit 23D, and the cover tape Ca of the storage tape C is peeled off from the slit 23D and stored in a storage portion (not shown). That is, the electronic component D stored in the storage portion Cd of the storage tape C is sent to the opening 23E in a state where the cover tape Ca is peeled off, and is sucked and taken out by the suction nozzle 18.

  Next, the tape feeding mechanism 22 will be described. The tape feeding mechanism 22 includes a servomotor 28 that is a drive source capable of forward and reverse rotation having a gear 27 on its output shaft, and a gear 30 in which a timing belt 29 is stretched between the gear 27 at one end. The rotating shaft 33 supported rotatably on the support 31 via bearings 32 and 32 and the worm gear 34 which is a rotating direction converting gear provided at the intermediate portion of the rotating shaft 33 are engaged with each other to change the rotating direction. The worm wheel 35, which is the same rotation direction changing gear, is fixed by a screw 35A, and the feed teeth 36H formed around the feed hole Cb formed in the storage tape C at predetermined intervals are engaged with each other. The sprocket 36 is configured to be rotatable with the support shaft 37 as a fulcrum.

  Then, when the servo motor 28 is driven to rotate in order to supply the electronic component D in the storage tape C in the component supply unit 6, the gear 27 and the gear 30 are rotated via the timing belt 29, thereby rotating the rotation shaft 33. The sprocket 36 rotates intermittently by a predetermined angle in the feed direction of the storage tape C via the worm gear 34 and the worm wheel 35, so that the storage tape C passes through the feed hole Cb at every interval of the storage portions Cd. Intermittent feed.

  Further, the suppressor 23 has a generally U-shaped cross section from a vertical piece 23A serving as a support portion and a horizontal piece 23B that holds the storage tape C engaged with the feed teeth 36H of the sprocket 36 so as not to come off. When the locking is released to the feeder main body 21 and the locking is released, the vertical piece 23A is rotatably supported with the pin 43 at the rear as a fulcrum.

  That is, the swing which can be swung by being urged by the spring 40 which is a biasing body supported by the lower end of the feeder main body 21 through the support shaft 41 supported by the feeder main body 21 so as to be swung clockwise. A piece 42 is provided, and the swing piece 42 is connected to the vertical piece 23 </ b> A of the suppressor 23 via a pin 43 so as to be swingable. Therefore, the oscillating piece 42 oscillates clockwise via the support shaft 41 by the urging force of the spring 40, and the suppressor 23 also oscillates clockwise. The rear part of the suppressor 23 (rightward in FIG. 2). Is urged to swing clockwise through the support shaft 41. When the front portion of the suppressor 23 is locked, the storage tape C with the feed hole Cb meshed with the teeth of the sprocket 36 is pressed so as not to come off. To do.

  Then, a torsion spring 39 is wound around the pin 43, and one end (the right end in FIG. 2 is bent toward the front side) is a locking piece formed at the rear end of the vertical piece 23A of the suppressor 23. 23C is locked from below, and the other end (the left end in FIG. 2) is housed inside a recess formed in the swing piece 42 and locked to the swing piece 42, thereby closing the suppressor 23 (FIG. 2). (Counterclockwise).

  Further, the front end portion of the component supply unit 6 is urged to rotate clockwise through a support shaft 51 supported by the feeder body 21 by a spring 50 whose rear end is supported by the feeder body 21. A swingable swinging piece 52 is provided, and the swinging piece 52 and a locking piece 53 provided with a locking pin 55 at the upper end are rotatably connected via a pin 54 and wound around the pin 54. One end of a rotated torsion spring (not shown) is locked to the locking piece 53 and the other end is locked to the support shaft 51, and the locking piece 53 is rotated counterclockwise by the torsion spring. Energized.

  Since the spring 50 urges the swinging piece 52 to rotate clockwise, the locking piece 53 is urged downward, and the front end of the vertical piece 23A of the suppressor 23 is applied to the locking pin 55. When the locking portion 56 is locked, the front portion (left portion in FIG. 2) of the suppressor 23 is biased downward, and the entire suppressor 23 is biased downward at both the front and rear portions together with the rear portion described above. When the operator presses the swing piece 52 against the urging force of the spring 50, the swing piece 52 swings counterclockwise about the support shaft 51 and the locking piece 53 moves obliquely upward. Thus, the locking of the locking pin 55 and the locking portion 56 is released, and the suppressor 23 swings clockwise via the pin 43 by the urging force of the spring 40. Thus, by opening the suppressor 23 (see FIG. 3), it becomes easy to load the storage tape C into the component supply unit 6.

  That is, when the suppressor 23 is simply opened, the suppressor 23 swings in the closing direction due to the urging force of the torsion spring 39. Therefore, after releasing the locking between the locking pin 55 and the locking portion 56, the operator It is necessary to swing the suppressor 23 in the opening direction. When the suppressor 23 is swung in the opening direction, the suppressor 23 presses the rear end of the leaf spring 44 fixed to the feeder body 21 via the screw 38, and the rear portion of the leaf spring 44 is swung (see FIG. 3). ), When the suppressor 23 is further swung in the opening direction, the suppressor 23 is generally in a vertical state, and the rear end portion of the suppressor 23 is fixed to the locking portion 44A formed by bending the rear end portion of the leaf spring 44. The suppressor 23 is locked and held (locked) in an open state, so that the storage tape C can be easily loaded into the component supply unit 6.

  In order to reduce the frictional resistance with the storage tape C and the carrier tape Cc, at least a portion of the suppressor 23 that can come into contact with the storage tape C and the carrier tape Cc of the horizontal piece 23B and the vertical piece 23A is a friction reducing layer. For example, a PTFE (polytetrafluoroethylene) layer 23S is formed, and the feed resistance of the storage tape C by the sprocket 36 is reduced as much as possible to stabilize the intermittent feed of the storage tape C.

  That is, at least a portion of the back surface (inner surface) of the horizontal piece 23B and the vertical piece 23A of the suppressor 23 that faces the storage tape C or the carrier tape Cc may come into contact with the storage tape C or the carrier tape Cc. Although the layer 23S is formed, a PTFE layer may be provided on the entire surface and the back surface of the suppressor 23 or on the entire back surface in order to improve work efficiency.

  The PTFE coating layer is contained in the dispersion by, for example, applying a dispersion of PTFE particles (PTFE dispersion) to a necessary location or by taking out after being immersed in the dispersion and drying the dispersion. It is formed by firing the PTFE particles that had been stored.

  With the above configuration, the mounting operation of the electronic component on the printed circuit board P will be described. First, the printed circuit board P is supplied from the supply conveyor 9 to the set table 8 and is positioned and fixed by the set table 8. Then, according to the mounting data, the XY stage 12 is driven so that the head unit 13 faces the component supply unit 6, and then the suction nozzle 18 provided on the mounting head 16 is lowered to move a desired electronic component to the component supply unit 6. Take out more.

  In this case, the control device sends a feed command to the component supply unit 6 that supplies the electronic component of the first step number in the mounting order according to the mounting data, and the control device controls the servo motor 28 and the cover tape peeling mechanism of the component supply unit 6. The component tape is driven to perform the component feeding operation and the cover tape peeling operation. The storage tape C lies under the suppressor 23, and the electronic component D in the storage portion Cd of the carrier tape Cc from which the cover tape Ca has been peeled off. It is sent to the part removal position PU (see FIGS. 4 and 5).

  That is, when the servo motor 28 is driven to supply the electronic component D in the storage tape C in the component supply unit 6, the rotation shaft 33 is rotated by the rotation of the gear 27 and the gear 30 via the timing belt 29, The sprocket 36 is intermittently rotated by a predetermined angle in the feed direction through the worm gear 34 and the worm wheel 35, whereby the storage tape C is intermittently fed through the feed hole Cb, and the cover tape Ca is peeled off by the cover tape peeling mechanism. The electronic component D sent to the component extraction position PU is extracted by the suction nozzle 18 through the opening 23E.

  At this time, the suppressor 23 is pressed from above so that the storage tape C in which the feed hole Cb meshes with the feed dog 36H of the sprocket 36 is not removed, but the storage tape of the horizontal piece 23B and the vertical piece 23A of the suppressor 23. Since the PTFE layer 23S, which is a friction reducing layer, is formed at a portion that can come into contact with C and the carrier tape Cc, the feeding resistance of the storage tape C by the sprocket 36 is reduced, so that the intermittent feeding of the storage tape C is performed. To stabilize.

  When the PTFE layer 23S is not formed as in the prior art, the following problems may occur, but this problem can be solved. That is, if the PTFE layer 23S is not formed during intermittent feeding of the storage tape C by the sprocket 36 rotating with the feed dog 36H meshing with the feed hole Cb formed in the carrier tape Ca, the feed resistance increases. When the load is excessively applied and the feed dog 36H widens the feed hole Cb, the feed amount of the storage tape C varies, and the component take-out positions PU vary, and the electronic component mounting device In the take-out from the component supply unit 6 by the suction nozzle 18, a so-called “stand-by suction” occurs in which a suction surface different from the original is sucked, and there is a problem that the taken-out electronic component is discarded. This inconvenience can be solved by stabilizing the intermittent feed of C.

  Subsequently, after the mounting head 16 is raised, the XY stage 12 is driven to move the electronic component to a position immediately above the component recognition camera 14 and image the electronic component sucked and held by the suction nozzle 18.

  Next, the mounting head 16 is moved to the position of the board P on the set table 8, and the board recognition camera 17 images the position recognition mark of the printed board P, and then the component recognition camera 14 and the board recognition camera 17 take an image. Based on the result of recognition processing by the recognition processing device, the X-axis drive motor of the XY stage 12, the Y-axis drive motor, and the θ-axis drive motor of the suction nozzle 18 are corrected and moved, and the vertical axis drive motor is driven. The suction nozzle 18 is lowered to mount the electronic component on the printed circuit board P. When all the electronic components are mounted on the printed circuit board P, the electronic components are discharged from the set table 8 to the downstream device via the discharge conveyor 10.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the various embodiments described above without departing from the spirit of the present invention. It encompasses alternatives, modifications or variations.

1 Electronic component mounting device body 6 Component supply unit 23 Suppressor 23S PTFE layer 36 Sprocket

Claims (1)

  A sprocket having a feed dog fitted so that a component storage section for storing electronic components peels off a cover tape of a storage tape formed at a predetermined interval and is pressed by a suppressor so as not to be disengaged from a feed hole of a carrier tape. In the component supply apparatus for supplying the electronic component stored in the component storage section to the component pick-up position by rotating about the support shaft, the suppressor is used to reduce the frictional resistance with the storage tape or the carrier tape. A component supply device, wherein a friction reducing layer is formed on the back surface of the sheet.

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