JP2009140986A - Part supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the looseness of a gear in the falling direction, the insufficient accuracy of the transmission of driving power caused by the looseness of a gear in backlash. <P>SOLUTION: The part supply device is provided with: a base bearing 32 wherein a projecting part 32B with a penetrated bearing hole 32A is formed on the rear side of a base and a base bearing is fitted to the device unit 12 through the rear surface 32C of the base; a gear 26 made integral with a rotary shaft 34 which is inserted from the front side of the bearing hole to be engaged therewith; a flange 36 which is fixed at the tip of the rotary shaft and made close to the tip of the projecting part; and an elastic body 38 which is interposed between the flange and the rear surface of the base so as to press the gear to the base. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a component supply device, and more particularly to a component supply device suitable for application when a gear is rotated to feed a carrier tape to stably supply components stored in the carrier tape with high accuracy.

  As a conventional component supply device (tape feeder), for example, there is one disclosed in Patent Document 1.

  In such a component supply apparatus, in order to supply the carrier tape containing the components to a predetermined supply position (pickup position), the carrier tape is intermittently sent out sequentially by a sprocket. A spur gear driven by a drive source such as a motor is generally used for power transmission to the sprocket.

  FIG. 1 is a cross-sectional view through the center of a rotating shaft showing the characteristics of a conventional two-stage spur gear applied to a component supply device.

  In this two-stage spur gear, a large-diameter gear 1 and a small-diameter gear 2 coaxially fixed to the large-diameter gear 1 are inserted, and a rotary shaft 4 fixed to the base 3 is inserted into a gear hole formed through the small-diameter gear 2. In this state, it is fixed with a screw 5 and can rotate integrally around the rotation shaft 4. The base 3 is fixed to the frame 6 of the component supply apparatus main body by screws or the like, and transmits power for feeding the carrier tape along the frame 6.

  This two-stage spur gear is attached to the base 3 with a cantilever support structure as shown in the figure, and the thrust in the thrust direction is caused by the seat surface 2A of the small-diameter gear 2 and the seat surface 5A of the screw 5 with respect to the base 3. It is a structure that supports.

JP 2007-67156 A

  However, in the support structure of the two-stage spur gear by the seat surface of the small-diameter gear and the seat surface of the screw as described above, the gear tilted with respect to the surface orthogonal to the rotation shaft 4 as indicated by the left and right arrows in the figure. Since the rattling in the tilting direction cannot be suppressed, the meshing position becomes unstable, and there is a problem that the power transmission accuracy by the gears is lowered.

  In order to solve this problem, if the accuracy of the fitting between the rotating shaft and the gear hole is tightened so as to suppress the rattling of the gear, the problem of seizure is likely to occur and processing accuracy is required. As a result, another problem arises that the cost increases.

  In addition, since the support structure has a backlash in the gear, it has a structure in which there is almost no restraining force in the rotational direction within the range, so that the gear violates (rattles) in the backlash at the start of driving. Therefore, there is also a problem that power transmission accuracy is poor within the range of backlash.

  The present invention has been made to solve the above-mentioned conventional problems. Both the power transmission accuracy failure due to the backlash in the gear tilt direction and the power transmission accuracy failure due to the backlash of the gear in the backlash are both present. It is an object to provide a component supply device that can be suppressed.

  According to the present invention, a projecting portion through which a bearing hole passes is formed on the back side of the base, and a base bearing attached to the apparatus main body via the back surface of the base, and a rotating shaft fitted and inserted into the bearing hole from the front side of the base. A formed gear, a flange fixed to the tip of the rotating shaft and proximate to the tip of the protrusion, and interposed between the flange and the back surface of the base, and elastic to urge the gear toward the base The above-mentioned problems are solved by providing a body.

  In the present invention, the second gear may be coaxially fixed to the gear portion on the side opposite to the rotating shaft.

  According to the present invention, the rotation shaft formed integrally with the gear is inserted into the base bearing fixed to the frame of the component supply device, and the gear is biased in the base direction by the elastic body. In addition, it is possible to prevent the occurrence of gear inclination (inclination direction) and rattling in the rotation direction with respect to the plane orthogonal to the rotation axis at the same time, and the power transmission accuracy can be greatly improved.

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

  FIG. 2 is a side view showing an outline of the component supply apparatus according to the first embodiment of the present invention.

  The component supply apparatus (tape feeder) 10 according to the present embodiment has a main body formed of a frame 12 made of aluminum or the like, and a carrier tape T fed from a reel (not shown) via a tape path 14 formed in the frame 12. Are delivered at a constant pitch, and the components housed in the cavity of the carrier tape T are sequentially supplied to the pickup position 16.

  The carrier tape T is fed by engaging the needle portion of the sprocket wheel 18 with holes formed at a predetermined pitch on the longitudinal side portion of the tape T and intermittently rotating the wheel. Yes.

  The rotation of the sprocket wheel 18 is realized by driving a sprocket gear 20 that is coaxially fixed via a relay gear 22. A driving force is transmitted to the relay gear 22 by a small diameter gear 26 that rotates coaxially with a large diameter gear 24 of a two-stage spur gear, and the large diameter gear 24 is engaged with a motor gear. It is rotated by a motor 30 via 28.

  The characteristics of the component supply device of the present embodiment will be described with reference to FIG. 3 corresponding to the ZZ cross section of FIG. 2 passing through the center of the rotation shaft of the two-stage spur gear.

  A base bearing 32 is attached to the frame 12, which is the main body of the apparatus, through a back surface of the base, and the base bearing 32 is formed with a protrusion 32B through which a bearing hole 32A is formed on the back side of the base.

  Further, the component supply apparatus 10 of the present embodiment includes the small-diameter gear 26 formed integrally with the rotary shaft 34 fitted and inserted into the bearing hole 32A from the front side of the base, and a screw 34A at the tip of the rotary shaft 34. A spring receiving flange 36 that is fixed and disposed close to the tip of the projecting portion 32B, and a compression coil spring (elastic body) that is interposed between the flange 36 and the base back surface 32C and biases the gear 26 in the base direction. 38).

  Further, the large-diameter gear 24 as the second gear is coaxially fixed to the small-diameter gear (part) 26 on the side opposite to the rotating shaft 34.

  Further, a small-diameter gear flange 40, which is a second flange slidably contacting the base surface, is fixed to the rotary shaft side of the small-diameter gear 26.

  The two-stage spur gear support structure constituting the feed mechanism applied to this embodiment will be described in detail. The large-diameter gear 24, the small-diameter gear 26, the small-diameter gear flange 40, the spring bearing flange 36, and the screw 34A having a coaxial structure are assembled. Constitutes a gear-integrated component and rotates integrally.

  The rotation of the integral part is supported by the base bearing 32. In addition, since the compression coil spring 38 is interposed between the spring receiving flange 36 and the back surface 32C of the base bearing 32, the gear-integrated component is attracted in the seating surface direction (base direction), so that the gear tilt direction. It is possible to suppress rattling.

  Further, by providing the small-diameter gear flange 40, it is possible to increase the area of the seating surface of the gear-integrated component, and thus it is possible to more reliably suppress the rattling of the gear.

  Further, as shown in FIG. 3, by providing the compression coil spring 38, the small-diameter gear flange 40 is rotated while being attracted to the base bearing 32. Can be generated. Therefore, since the gear integrated component is maintained in a stationary state at the stop position, it is possible to suppress the violence (rattle) caused by the reverse rotation of the gear in the backlash.

  According to the embodiment described in detail above, the following effects can be obtained.

  (1) By increasing the seating surface area of the two-stage spur gear with the small-diameter gear flange 40 and attracting the gear to the seating surface (base direction), troubles due to poor power transmission accuracy due to the occurrence of tilting direction are generated. Can be suppressed.

  (2) By attracting the two-stage spur gear to the seating surface and imparting a resistance force to the movement in the rotational direction, it is possible to suppress the occurrence of problems due to poor power transmission accuracy due to rattling in the gear backlash.

  In the above embodiment, an example of a two-stage spur gear is shown, but a single-stage spur gear may be used.

  Further, a sheet having good lubricity may be sandwiched between the small diameter gear flange 40 and the base bearing 32.

  Furthermore, a wave washer or the like may be used as the elastic body instead of the compression coil spring 38.

Sectional view showing a conventional two-stage spur gear support structure The side view which shows the outline | summary of the components supply apparatus of 1st Embodiment which concerns on this invention. Sectional drawing which shows the principal part which shows the support structure of the two-stage spur gear applied to this embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Parts supply apparatus 12 ... Frame 14 ... Tape path 16 ... Pick-up position 18 ... Sprocket wheel 20 ... Sprocket gear 22 ... Relay gear 24 ... Large diameter gear 26 ... Small diameter gear 28 ... Motor gear 30 ... Motor 32 ... Base bearing 32A ... Bearing Hole 32B ... Projection 32C ... Back of base 34 ... Rotating shaft 36 ... Spring receiving flange 38 ... Compression coil spring (elastic body)
40 ... Small diameter gear flange T ... Carrier tape

Claims (2)

A base bearing formed on the back side of the base through which the bearing hole penetrates, and attached to the apparatus body via the back side of the base;
A gear formed integrally with a rotating shaft fitted and inserted into the bearing hole from the base front side;
A flange fixed to the tip of the rotating shaft and proximate to the tip of the protrusion;
A component supply device comprising: an elastic body interposed between the flange and the back surface of the base and biasing the gear toward the base.   The component supply device according to claim 1, wherein a second gear is coaxially fixed to a gear portion opposite to the rotation shaft.

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