JPH0357014B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a tape feeder that is detachably mounted on an electronic component mounting machine.

[Background technology]

The tape feeder intermittently moves a tape containing a large number of chip parts such as microelectronic parts to be mounted on a printed circuit board or the like in each storage recess at a predetermined interval, and places the tape in the storage recess at an appropriate position. The covering top tape is peeled off and the minute electronic components are fed one by one to an electronic component mounting machine. By the way, conventional tape feeders are equipped with only a tape feed gear and a ratchet gear fixed to the tape feed gear as a tape feed mechanism, and this tape feed mechanism serves as a discharge mechanism for tape (empty tape) that has been supplied with microelectronic components. It also served as However, with this mechanism alone, there has been a problem in that the tape sometimes becomes unable to be ejected midway through. In addition, this tape feeder transfers the tape intermittently by intermittent rotation of the ratchet gear.
The top tape is peeled off at a predetermined position to expose the microelectronic components, but the shock caused by the rotation of the ratchet gear causes the microelectronic components to pop out of the storage recesses of the tape or stand up. Another problem was that the supply of electronic parts was not carried out smoothly.

[Purpose of the invention]

An object of the present invention is to provide a tape feeder that can smoothly discharge empty tapes and can also smoothly supply minute electronic components.

[Disclosure of the invention]

In order to achieve the above object, the tape feeder of the present invention includes a tape feed gear that feeds the tape by its own rotation by engaging teeth on the outer periphery with feed holes provided on the side edge of the tape, and a tape feed gear that feeds the tape by its own rotation. A ratchet gear attached to the gear, a drive arm that swings around the axis of the ratchet gear, a ratchet claw provided on the drive arm that blocks the rotation direction of the ratchet gear in only one direction, and one end attached to the drive arm. a drive shaft which is connected to the drive shaft and can be advanced and retracted to rotate the ratchet gear by one tooth with a ratchet pawl as it advances; a return spring located at the other end of the drive shaft and which constantly biases the drive shaft to retract; a slowing means for slowing down;
A holding plate is provided which elastically pinches the tape that has passed through the tape feed gear between a roller that rotates in only one direction due to the retraction operation of the drive shaft and the peripheral surface of the roller, and the tape is rotated by the rotation of the roller. The tape is configured to include a tape ejecting means that is driven in the direction of ejecting the tape to the outside.

Next, the present invention will be explained in detail based on examples.

FIG. 1 shows an embodiment of the invention. In the figure, reference numeral 1 denotes a substrate used in an upright state, and a disk-shaped tape feed gear 3 is rotatably attached to a shaft 2 at one end of the substrate. This disc-shaped tape feed gear 3 has feed teeth 4 at predetermined intervals on its outer periphery, and these feed teeth 4 are formed along the side edge of the tape 5 at predetermined intervals along the longitudinal direction. Sprocket hole 5
b (see Figure 2).
6 is a ratchet gear integrated with the feed dog 4 by a screw 7; 8 is a drive arm that swings around the shaft 2; and 9 is a ratchet pawl provided on the drive arm 8. . Reference numeral 10 denotes a reversal prevention pawl, which acts to prevent the ratchet gear 6 from reversing when the ratchet pawl 9 slides on the teeth of the ratchet gear 6. Reference numeral 11 denotes a guide whose upper portion is formed on a guide base portion 12 and along which the tape 5 is moved. This tape 5 is the second
As shown in the figure, a microelectronic component 14 is accommodated in the housing recess 13 and covered with a transparent top tape 15, and the side edge of the microelectronic component 14 is covered with a guide base portion 15.
2 and is set so that the feed teeth 4 of the feed gear 3 can mesh with a feed hole 5b provided on the side edge. Reference numeral 19 denotes a cover plate, the cover plate portion 20 of which functions to prevent the tape 5 from lifting up, and the peeling plate portion 21 of which functions to peel the top tape 15 from the tape 5. That is, as shown in FIG. 3, the cover plate body 19 has a mounting plate portion 22 that can rotate vertically about an axis 23 within the interval formed between the guide 11 and the substrate 1. The cover plate portion 20 is located above the guide base portion 12 to prevent the tape 5a shown by the dashed line from lifting up. Then, the peeling plate section 21 reversely peels off the top tape 15 shown by the two-dot chain line from the tape 5 to expose the microelectronic component 14 housed in the housing recess 13 of the tape. The exposed microelectronic component 14 is sucked into the suction space 24 between the cover plate part 20 and the peeling plate part 21 by the suction nozzle 25 shown by the chain line, and the suction nozzle 2
5 and is disposed on a printed circuit board or the like by releasing the suction. Reference numeral 26 denotes a tension spring that tensions and biases the cover plate 19 in the direction of the guide base portion 12. Reference numeral 27 denotes a drive shaft, which is supported by a shaft holder 28 fixed to the base plate 1 so as to be movable left and right. The drive shaft 27 has one end pivoted to the drive arm 8 and the other end pivoted to the drive arm 29a of the one-way clutch 29 fixed to the base plate 1. The one-way clutch 29 means that when the input shaft to which the drive arm 8 is attached is rotated in a certain direction, the rotation is transmitted to the output shaft and rotates the roller 29b which becomes the output shaft, but when rotation in the opposite direction is applied. In this case, the roller 29b is rotated idly and no rotation is transmitted to the roller 29b, and is a mechanism used in power transmission systems of various mechanical devices. Reference numeral 30 denotes a drive lever, which is rotatably attached to the mounting shaft 1a of the board 1, and when the drive portion 31a of the air cylinder 31 is lowered, the drive shaft 27 is moved in the direction of arrow B.
drive in the direction. 32 is a return spring for the drive shaft 27, and 33 is an air damper whose piston 33a is connected to the drive shaft 27 via a connecting arm 34. This air damper 33 acts to dampen the sudden return of the drive shaft 27 when it returns due to the spring force of the return spring 32, and to slow down its return speed (regression speed). 35 is the air damper 33
The retraction speed of the drive shaft 27 can be adjusted as appropriate by adjusting the degree of twisting of the knob 36. 37 is micro electronic component 14
a presser plate 3 for pressing the empty tape 5a after it has been taken out against the roller 29b of the one-way clutch 29;
8 is its spring; 39 is a presser plate that presses the tape 5 containing the minute electronic component 14 against the guide roller 40; and 41 is its spring. Reference numeral 42 denotes a top tape reel, which is disposed between the substrate 1 and a support plate 43 provided at a constant interval with respect to the substrate 1;
The rotating shaft 44 is loosely fitted into an upper open elongated hole 42a provided in the substrate 1 and the support plate 43, thereby being rotatably supported. Reference numeral 45 denotes a rubber roller that constantly urges the top tape reel 42 to rotate in the direction of arrow D. The state in which this tape feeder is mounted on the electronic component mounting machine 46 is shown in FIGS. 4 and 5. That is, the electronic component storage tape 5 is supplied to the tape feeder from an electronic component storage tape reel 47 that is removably attached to the electronic component mounting machine 46, and a rubber roller 45 and a rubber roller 45 that urge the top tape reel 42 to rotate. An air cylinder 31 that drives the drive shaft 27 and a suction nozzle 25 that sucks exposed electronic components.
is installed on the electronic component mounting machine 46. 48
Reference numeral 49 indicates a printed circuit board on which electronic components are arranged, and 49 a control unit for programming for controlling the operation of the suction nozzle 25. The electronic component mounting machine 46 is detachably equipped with several tape feeders each housing a different type of microelectronic component as a set.

In this configuration, when the drive portion 31a of the air cylinder 31 is lowered, the drive lever 30 rotates about the shaft 1a from the state shown in FIG. Move in direction B. This movement of the drive shaft 27 causes the drive arm 8 to rotate clockwise about the shaft 2, and its ratchet pawl 9 slides over the teeth of the ratchet gear 6 by one tooth. At this time, the drive arm 29a of the one-way clutch 29 simultaneously rotates counterclockwise due to the movement of the drive shaft 27 and assumes a preparatory position for feeding the empty tape 5a in the direction of arrow E. At this time, even if the drive arm 29a rotates, the roller 29b does not rotate. When the drive section 31a of the air cylinder 31 rises from this state,
The drive shaft 27 is returned to its initial state by the spring force of the return spring 32. As the drive shaft 27 returns, the drive arm 8 rotates counterclockwise about the shaft 2, and the ratchet pawl 9 rotates the ratchet gear 6 counterclockwise by one tooth. Due to this rotation, the tape feed gear 3 integrated with the ratchet gear 6 rotates counterclockwise by one tooth of the ratchet gear 6, and the tape 5 containing the microelectronic component 14 is fixed in the direction of arrow A. Move the dimensions. in this case,
Since the top tape 15 is constantly tensioned and biased in the direction of arrow F as shown in FIG. 3 by the rotational biasing force applied to the top tape reel 42, the tape 5 is moved by a fixed distance in the direction of arrow A. As a result, the tape 5 is peeled off by the amount of movement. As a result, the minute electronic component 14 housed in the tape 5
is exposed in the suction space 24. In particular, in this device, since the return speed of the drive shaft 27 is slowed down by the air damper 33, the tape 5
The fixed distance movement in the direction of arrow A is also performed slowly.
Therefore, the microelectronic component 14 is prevented from popping out or standing up, and a stable posture is maintained. The minute electronic component 14 thus exposed in the suction space 24 is suctioned by the suction nozzle 25 and placed at a predetermined position on the printed circuit board 48 . The return of the drive shaft 27 simultaneously rotates the drive arm 29a of the one-way clutch 29 clockwise, thereby rotating the roller 29b, which is elastically pressed against the roller 29b by the presser plate 37. The empty tape 5a is sent in the direction of arrow E and discharged to the outside. By repeating the above operations, the tape 5 is intermittently fed, and the microelectronic component 1
4 is supplied at predetermined time intervals, and empty tape 5a is supplied at predetermined time intervals.
is intermittently discharged to the outside.

〔Effect of the invention〕

Since the tape feeder of the present invention is configured as described above, the tape is fed slowly by a fixed distance. As a result, chip parts such as microelectronic parts are prevented from popping out or standing up during fixed-size feeding, and chip parts can be fed smoothly and stably. Further, since this tape feeder is equipped with a tape ejection means, it has an excellent effect of being able to smoothly and safely eject empty tapes.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the tape used therein, Fig. 3 is an enlarged perspective view of the main part of Fig. 1, and Fig. 4 shows the tape shown in Fig. 1 installed. A perspective view of the electronic component mounting machine, and FIG. 5 is a side sectional view thereof. 3... Tape feed gear, 5... Tape, 6...
Ratchet gear, 8... Drive arm, 9... Ratchet pawl, 15... Top tape, 27... Drive shaft, 29... One-way clutch, 30...
...Drive lever, 31...Air cylinder, 32...
Return spring, 33...Air damper.

Claims (1)

[Scope of Claims] 1. A tape feed gear that feeds the tape by its own rotation by engaging teeth on its outer periphery with feed holes provided on the side edge of the tape, and a ratchet gear attached to this tape feed gear. , a drive arm that swings around the axis of the ratchet gear; a ratchet claw provided on the drive arm that blocks the rotation direction of the ratchet gear in only one direction; and one end connected to the drive arm to allow the gear to move forward a drive shaft capable of advancing and retracting, which rotates the ratchet gear by one tooth with a ratchet pawl; a return spring located at the other end of the drive shaft that constantly urges the drive shaft to retract; and a slowing means that slows down the retraction speed of the drive shaft; A holding plate is provided which elastically pinches the tape that has passed through the tape feed gear between a roller that rotates in only one direction due to the retraction operation of the drive shaft and the peripheral surface of the roller, and the tape is rotated by the rotation of the roller. A tape feeder comprising a tape ejection means that is driven in the direction of ejecting the tape to the outside. 2. The tape feeder according to claim 1, wherein the slow movement means is an air damper.