JP4308607B2 - Tape feeder unit - Google Patents

Description

  The present invention relates to a tape feeder unit that supplies small parts such as an electronic chip to an assembly apparatus, and more particularly to an intermittent feeding unit thereof.

  In a tape feeder unit that supplies small parts such as electronic chips to an assembly device such as a chip mounter, it is arranged at a predetermined location by intermittently feeding a transport tape carrying parts at a constant interval with a constant feed amount. The suction head picks up the parts in the cell of the transport tape.

In such a tape feeder unit, a feed unit for intermittently feeding the transport tape at a constant feed amount includes a feed gear engaged with the transport tape, a ratchet that drives the feed gear, and a drive that engages the ratchet. A structure having a claw and a structure in which the ratchet is intermittently driven by swinging the drive claw is known.
JP 2000-332490 A ("Example" column, FIGS. 1 to 5)

  In the tape feeder unit using the intermittent feed unit described above, it has been required to feed parts with a feed amount smaller than that of conventional parts as the parts to be supplied are downsized. In order to reduce the feed amount, the pitch of the ratchet teeth of the intermittent feed unit and the swing amount of the driving claw may be reduced. However, when trying to reduce the pitch of the ratchet teeth, the teeth become smaller and the number of portions that engage with the drive claw decreases, so that the drive claw jumps during feeding operation and the progress of tooth wear is accelerated and reliable. There are problems such as the inability to feed.

  Further, in the intermittent feed unit described above, the ratchet is usually an external gear type with teeth formed on the outer peripheral side, and a drive claw is disposed at a position facing this, so that the ratchet is between the ratchet and the drive claw. There is a possibility that the foreign matter may be caught and the driving claw may not be engaged with the ratchet, and the feeding may be stopped. In addition, the amount of lubricant applied is often limited because the lubricant applied to the ratchet teeth may scatter during operation and contaminate the parts placed on the transport tape and the surrounding area. The feed operation may become unstable due to a failure.

  Therefore, an object of the present invention is to stabilize the feeding operation of the intermittent feeding unit in the tape feeder unit.

  In order to solve the above-described problems, the present invention is configured to rotatably attach a feed gear and a ratchet engaged with a transport tape to a frame, and swing the drive claw that engages with the ratchet to intermittently drive the ratchet. Thus, in the tape feeder unit that intermittently feeds the transport tape at a constant feed amount, the number of the drive claws is set to two or more, and the value obtained by dividing the number of the ratchet teeth by this number is the value of each drive claw. A swinging amount was adopted, and each of these drive claws was arranged one by one at the position where it was bitten into the ratchet.

  That is, two or more drive claws are oscillated by the oscillating amount obtained by dividing the ratchet tooth pitch by the number of the pawls, and the ratchet is intermittently driven by biting into the ratchet one by one. The teeth were made larger to prevent poor feeding due to tooth skipping and early tooth wear.

  By adopting a structure in which a one-way clutch type torque limiter is incorporated between the ratchet and the rotating shaft as a means for preventing reverse rotation of the ratchet, the check pawl can be omitted. Further, by configuring the one-way clutch type torque limiter to have a constant idling torque, it is possible to prevent the forward tape from being easily advanced even if an external force in the feed direction acts on the transport tape.

As described above, the tape feeder unit of the invention, together with a number of driving pawl for intermittently driving the ratchet and 2 or more, the swing amount of the drive pawl a value obtained by dividing the pitch of the ratchet teeth in the number and then, from each of these drive claws is obtained so as to drive the ratchet Nde jammed the ratchet one by one, it is possible to drive nails to increase the ratchet teeth than the one, which Thus, tooth skipping of the driving claw can be made difficult to occur, and progress of tooth wear can be suppressed to stabilize the feeding operation. Therefore, it is possible to easily cope with a case where it is required to reduce the feeding amount as the parts are downsized.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.

  1 to 3 relate to a tape feeder unit according to the first embodiment. The feed tape 2 in this case is composed of a transport tape 2a and a top tape 2b. The intermittent feed unit 1 for feeding the transport tape 2a to the frame 3 and the winding unit 5 for winding the top tape 2b peeled off by the peeling claw 4 are used. These two units 1 and 5 are connected to a common drive source 8 that reciprocates with a constant stroke by interaction with the return spring 7 via interlocking links 6a and 6b. A suction head 10 for picking up components 9 such as an electronic chip mounted on the transport tape 2a at regular intervals is arranged downstream of the peeling claw 4 by a part of an assembly apparatus (not shown).

  The feed tape 2 is formed by providing cells 11 each containing components 9 one by one on the upper surface side of the transport tape 2a at equal intervals in the feed direction, and attaching a top tape 2b covering each cell 11. Holes 12 are provided in the transport tape 2a in parallel with the cells 11 at equal intervals. As will be described later, the holes 12 are engaged with one end of the intermittent feed unit 1 so that the feed amount is equal to the component interval. Is sent intermittently.

  The winding unit 5 includes a swing lever 15 and a take-up reel 16 attached to a base plate 13 fixed to the frame 3 via a support shaft 14, and a one-way clutch unit 17 incorporated therein. Basically composed. The swing lever 15 has a front end of the interlocking link 6b supported by a guide pin 18 abutted on a front end of the main arm 15a, and a spring arm 15b opposite to the main arm 15a is connected to a return spring 19. And swings via the interlocking link 6b by the reciprocating motion of the drive source 8. The swing of the swing lever 15 is transmitted to the take-up reel 16 only when the stroke of the drive source 8 is in the reverse direction by the action of the one-way clutch unit 17 to rotate the take-up reel 16. Thus, the take-up reel 16 intermittently winds the top tape 2b peeled off by the peeling claw 4 via the peeling roller 20 attached to the interlocking link 6b and the base roller 21 attached to the base plate 13. Take it.

  As shown in FIG. 2, the intermittent feed unit 1 according to the first embodiment includes a feed gear 22 that engages with the hole 12 of the transport tape 2 a and a ratchet 23 that is integral with the feed gear 22, and two drives that engage with the ratchet 23. A claw 24 is attached to the interlocking link 6 a, and two reversal prevention claws 25 for preventing the ratchet 23 from reversing are attached to the frame 3. The feed gear 22 and the ratchet 23 are rotatably inserted into the center thereof through a support shaft 26 integral with the interlocking link 6a. Together with the support shaft 26 and the interlocking link 6a, a bolt 27, a washer 28 and a nut 29 are attached to the frame 3. It is attached to the provided mounting recess 3a. Therefore, when the drive source 8 reciprocates, the interlocking link 6 a and the drive claw 24 swing around the support shaft 26.

  Each drive claw 24 swings to the interlocking link 6a so that the swinging amount (the amount of movement of the tip portion due to the swinging of the interlocking link 6a) is half the pitch of the teeth of the ratchet 23, and is alternately engaged with the ratchet 23. It is attached freely. Similarly, the respective reverse rotation preventing claws 25 are also rotatably attached to the frame 3 so as to alternately bite into the ratchet 23. Further, each driving claw 24 and each reverse rotation preventing claw 25 are connected to a spring, and the tip portion is pressed against the teeth of the ratchet 23.

  Next, the operation of the intermittent feed unit 1 will be described with reference to FIGS. FIG. 3A shows a first state in which one of the drive claws 24 and one of the reverse rotation prevention claws 25 are engaged with the ratchet 23. From this state, when the interlocking link 6a swings in the right direction in the drawing, as shown in FIG. 3B (second state), one of the driving claws 24 drives the ratchet 23 that has been engaged, and the pitch of the teeth is increased. Rotate half. As a result, the feed gear 22 integrated with the ratchet 23 rotates, and the transport tape 2a engaged with the feed gear 22 is fed to the left in the drawing by one pitch (one cell 11). Further, the reverse rotation preventing claw 25 biting into the ratchet 23 is changed from one to the other.

  When the interlocking link 6a swings in the left direction from the state of FIG. 3B, each drive claw 24 slides with the teeth of the ratchet 23 and retracts by a half pitch in the direction opposite to the drive direction. At this time, since one of the reverse rotation prevention claws 25 is engaged with the ratchet 23, the ratchet 23 is not reversed due to a frictional force between the ratchet 23 and the like. Then, as shown in FIG. 3C (third state), one drive claw 24 is disengaged from the engagement position with the ratchet 23, and the other drive claw 24 is engaged with the ratchet 23 instead. During this time, the component 9 housed in the cell 11 of the transport tape 2 a and sent immediately below the suction head 10 is picked up by the suction head 10.

  When the interlocking link 6a swings again in the right direction in the drawing from the state shown in FIG. 3C, the other driving claw 24 rotates the ratchet 23 by a half pitch, as shown in FIG. 3D (fourth state). The feed gear 22 rotates to feed the transport tape 2a by one pitch. At the same time, the reverse rotation preventing claw 25 biting into the ratchet 23 is changed again.

  The above-described operation is repeated by continuous rocking of the interlocking link 6a accompanying the reciprocating motion of the drive source 8, the ratchet 23 is intermittently driven by half a pitch, and the transport tape 2a is intermittently fed by 1 pitch.

  As described above, the intermittent feed unit 1 intermittently drives the ratchet 23 by half pitch alternately by the two driving claws 24, so that the teeth of the ratchet 23 are compared with those of the conventional type having one driving claw. Can be bigger. Accordingly, tooth skipping of the drive claw 24 is unlikely to occur, the pressure acting on the tooth surface of the ratchet 23 is small, and the progress of tooth wear is suppressed, so that the feeding operation is stable.

  4 and 5 show a second embodiment. In the intermittent feed unit 31 of the second embodiment, the one-way clutch type torque limiter 33 is replaced with the ratchet 32 and the feed gear 34 as a means for preventing the reverse rotation of the ratchet 32, instead of the reverse rotation prevention pawl 25 in the first embodiment. These are integrated and incorporated between the support shafts 26. Other configurations are the same as those in the first embodiment.

  The one-way clutch type torque limiter 33 is slightly narrower in the driving direction of the ratchet 32 (arrow A in FIG. 4) between the support shaft 26 at three locations on the inner peripheral side of the ratchet 32 and the feed gear 34. A pocket 35 having a wedge angle is provided, and a roller 36 and a spring 37 are accommodated in the pocket 35, and the roller 36 is urged by the spring 37 toward the narrow side of the wedge angle. When the interlocking link 6a swings in the driving direction, the idle gear rotates and the feed gear 34 engages with the ratchet 32 to rotate the feed gear 34 integral therewith in the feed direction. When the interlocking link 6a swings in the reverse direction, the interlocking link 6a is locked to prevent the ratchet 32 and the feed gear 34 integrated therewith from being reversed.

  Further, the one-way clutch type torque limiter 33 increases the torque value (idling torque value) necessary for idling in the driving direction by increasing the elastic force of the spring 37 than in a general case (generally, the idling torque value). Is 0.1 kgf · cm or less, in this embodiment, it is set to about 1 to 5 kgf · cm). For this reason, even if an external force in the feed direction acts on the transport tape 2a for some reason while the interlocking link 6a is stopped, the transport tape 2a is not sent unless the magnitude exceeds the idling torque value. Absent. Therefore, in the intermittent feed unit 31, the transport tape 2a does not easily move in the feed direction during the setup work, and the work is easy to perform, and the advance of the transport tape 2a during the feed operation hardly occurs.

6 to 9 show a third embodiment. This intermittent feed unit 41 has a ratchet 43 integral with a feed gear 42 that engages the transport tape 2a as an internal gear type, and a one-way clutch 46 is integrally provided on the back side of the ratchet 43, and the internal gear type On the inner peripheral side of the ratchet 43, the drive pawl 45 is rotatably attached by the shaft 53 at two axially symmetrical positions on the inner surface side of the interlocking link 44. The drive claw 45 is inclined in the feed direction of the feed gear 42, and its rear end portion is biased by a spring 54 so that the tip end portion engages with the ratchet 43 in the inclined state.

  As shown in FIG. 8, the interlocking link 44 has a disk-like cover portion 44 a, and the ratchet 43 and the driving claw 45 are closed by applying this portion to the outer surface of the ratchet 43.

  A support shaft 47 is inserted through the feed gear 42, ratchet 43, and one-way clutch type torque limiter 46, and is inserted into an attachment recess 55 provided in the frame 50. A fixing screw portion 56 provided at the tip of the support shaft 47 is passed through the back surface side of the frame 50 and is fixed by a nut 57.

  The interlocking link 44 is rotatably attached to the support shaft 47 with bolts 48 and washers 49. Similarly to the one-way clutch type torque limiter 33 of the second embodiment, the one-way clutch type torque limiter 46 houses rollers 59 and springs 61 in a plurality of pockets 58, and the bottom surface of the pocket 58 and the support shaft 47. In between, there is a wedge angle that becomes narrower in the driving direction of the ratchet 43 (feeding direction of the feed gear 42), and it is biased by the spring 61 in the narrowing direction.

  Each of the drive claws 45 has a swinging amount that is half the pitch of the teeth of the ratchet 43 and is rotatably attached to the interlocking link 44 so as to be alternately engaged with the ratchet 43. That is, each drive claw 45 swings around the support shaft 47 together with the interlocking link 44 so that one of the drive claws 45 is engaged with the ratchet 43 (see FIG. 8A) and the other is engaged. The state (see FIG. 8B) is alternately generated. Then, the driving claw 45 engaged with the ratchet 43 drives the ratchet 43 to rotate it by half of the pitch of the teeth, thereby rotating the feed gear 42 integral with the ratchet 43 and intermittently feeding the transport tape 2a. Sent. This operation is the same as that of the first embodiment, and this also makes it possible to make the teeth of the ratchet 43 larger than in the case where there is one drive claw (the one-dot chain line and the thin line in FIG. 8).

  The components 9 housed in the cell 11 of the transport tape 2a reach the position immediately below the suction head 10 and are picked up by the suction head 10 each time the transport tape 2a is fed a predetermined number of pitches.

  Further, in the intermittent feed unit 41, the ratchet 43 and the drive claw 45 are covered with the cover portion 44a of the interlocking link 44, so that foreign matter is caught between the ratchet 43 and the drive claw 45, and the feed operation is stopped. Such troubles are unlikely to occur. Furthermore, since there is no possibility that the lubricant applied to the teeth of the ratchet 43 will be scattered, the lubricant can be applied sufficiently. As a result, poor lubrication is less likely to occur, the feeding operation becomes smoother, and the effort of additional application of lubricant, which has been conventionally performed, can be saved.

  In each embodiment described above, the number of driving claws is two, but it may be three or more. In this case, since the ratchet is intermittently driven at a pitch equal to the amount of swing obtained by equally dividing the pitch of the ratchet teeth by the number of driving claws, the ratchet teeth are made larger than in the case of two and the feeding operation is performed. It can be stabilized.

  10 to 12 show a fourth embodiment. The intermittent feed unit 41 is basically the same as that in the third embodiment, and the ratchet 43 is in the form of an internal gear. The difference from the above case is that the number of the driving claws 45 is one and the pitch of the ratchet 43 is ½, that is, the number of teeth is doubled. Since all other configurations are the same, assuming that the swing amount of the interlocking link 44 is the same as in the above case, the feed amount of the ratchet 43 does not change, and the number of actuations of the drive pawl 45 is doubled.

  Therefore, the case of the fourth embodiment is suitable for a lower speed feeding unit than the case of the third embodiment. However, by adopting the internal gear type, the ratchet 43 and the driving claw 45 can be covered with the cover portion 44a of the interlocking link 44, whereby foreign matter is caught between the ratchet 43 and the driving claw 45 and the feeding operation is performed. Is difficult to occur, and there is no risk that the lubricant applied to the teeth of the ratchet 43 will scatter, so that the operational effects such as sufficient application of the lubricant can also vary. Absent.

Front view of the tape feeder unit of Embodiment 1 1 is an exploded perspective view of the intermittent feeding unit of FIG. The front view which shows the 1st state in operation | movement of the intermittent feed unit of FIG. Front view showing the second state of the above Front view showing the third state Front view showing the fourth state Example 2 tape feeder unit Vertical section of FIG. Front view of the intermittent feed unit of Example 3 Sectional drawing along the VII-VII line of FIG. (A) (b) is a principal part enlarged front view explaining the operation | movement of the intermittent feed unit of FIG. 6, respectively. 6 is an exploded perspective view of FIG. Front view of intermittent feed unit of embodiment 4 Sectional drawing along the XI-XI line of FIG. 10 is an exploded perspective view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intermittent feeding unit 2 Feed tape 2a Conveying tape 2b Top tape 3 Frame 3a Mounting recess 4 Peeling claw 5 Rewinding unit 6a, 6b Interlocking link 7 Return spring 8 Drive source 9 Parts 10 Adsorption head 11 Cell 12 Hole 13 Base plate 14 Support shaft 15 Swing lever 15a Main arm 15b Spring arm 16 Take-up reel 17 One-way clutch unit 18 Guide pin 19 Return spring 20 Peeling roller 21 Base roller 22 Feed gear 23 Ratchet 24 Drive claw 25 Reverse rotation prevention claw 26 Support shaft 27 Bolt 28 Washer 29 Nut 31 Intermittent Feed Unit 32 Ratchet 33 One-way Clutch Type Torque Limiter 34 Feed Gear 35 Pocket 36 Roller 37 Spring 41 Intermittent Feed Unit 42 Feed Gear 43 Ratchet 44 Link Link 44a Cover 45 Drive Claw 46 Way clutch type torque limiter 47 shaft 47a smaller diameter portion 48 bolt 49 washer 50 frame 53 shaft 54 spring 55 fitted recess 56 threaded portion 57 nut 58 pocket 59 roller 61 spring

Claims (3)

A feed gear and a ratchet engaged with the transport tape are rotatably attached to the frame, and the transport tape is intermittently driven at a constant feed amount by swinging a drive claw that engages with the ratchet and intermittently driving the ratchet. In the feeding tape feeder unit, the number of the drive claws is set to two or more, and the value obtained by dividing the number of the ratchet teeth by this number is used as the swing amount of each drive claw. A tape feeder unit, wherein the tape feeder unit is disposed at a position where the ratchet is sequentially bitten. Tape feeder unit of claim 1, wherein the incorporating a one-way clutch type torque limiter as reverse rotation preventing means of said ratchet between the ratchet and the rotary shaft. 3. The tape feeder unit according to claim 2 , wherein the one-way clutch type torque limiter has a constant idling torque.

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