JPH08236986A - Tape feeder - Google Patents

Abstract

PURPOSE: To prevent a feed pawl which pitch-rotates a ratchet wheel and a sprocket and engages with a gear tooth part of a ratchet wheel constituting a pitch feed part of a tape from colliding strongly with a gear tooth part of a ratchet wheel by spring force of a spring material which elastically biasing it, thus vibrating a pitch feed part and prevent a chip from jumping out of a pocket of a tape. CONSTITUTION: A sprocket 4 and a ratchet wheel 5 are pivoted on the same rotary shaft 3 and a feed pawl 6 which engages with a gear tooth part 5a of the ratchet wheel 5 is provided. The feed pawl 6 is driven by a driving lever 9 and oscillates, and pitch-rotates the ratchet wheel 5. Since a stopper 2 is provided, the feed pawl 6 comes into contact with the ratchet wheel 5 before the pawl is elastically biased by a spring material 8 and collides with the next gear tooth part of the ratchet wheel 5. Thereby, it is prevented from rotating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape feeder for supplying chips mounted on a board in an electronic component mounting apparatus.

[0002]

2. Description of the Related Art An electronic component mounting apparatus is designed to vacuum-pick up an electronic component (hereinafter, referred to as a "chip") provided in a parts feeder by a nozzle of a transfer head, pick it up, and transfer it to a substrate. There is. There are various types of parts feeders, such as tape feeders, tube feeders, tray feeders, etc. Among them, the tape feeders are particularly widely used because they can easily supply chips at high speed and in large quantities. It is used.

A conventional tape feeder will be described below. FIG. 8, FIG. 9, and FIG. 10 are side views of the pitch feeding section of the conventional tape feeder, and are shown in the order of the tape pitch feeding operation. In FIG. 8, reference numeral 1 is a base, and a pitch feed portion 2 is provided in the front portion thereof. The pitch feed unit 2 is configured as follows. Reference numeral 3 denotes a rotating shaft, on which a sprocket 4 and a ratchet wheel 5 are coaxially mounted. Reference numeral 6 denotes a feed pawl, which is pivotally attached to the pin 7, and its tip end engages with the tooth portion of the ratchet wheel 5. The feed claw 6 is elastically urged counterclockwise by a spring material 8. Reference numeral 9 is a drive lever, and the pin 7 of the feed pawl 6 is pivotally attached to the drive lever 9. When the drive lever 9 is driven by a swing lever (not shown) to swing, the feed claw 6
Oscillates in conjunction with this, engages with and disengages from the teeth of the ratchet wheel 5, and rotates the ratchet wheel 5 in the counterclockwise direction (arrow a). The sprocket 4 also rotates in the same direction as the ratchet wheel 5 in the same direction. A tape 10 is banded on the sprocket 4, and the tape 10 is pitch-fed forward by the pitch rotation of the tape 10.

Reference numeral 11 is a reverse rotation preventing claw, which is pivotally attached to the pin 12. The reverse rotation preventing claw 11 is elastically urged by the spring material 13, and the tip end thereof engages with the tooth portion of the ratchet wheel 5, so that the ratchet wheel 4 reverses the pitch feed direction of the tape 10 (clockwise direction). Prevent it from spinning.

Reference numeral 15 is a shutter. This shutter 15
Covers the upper part of the pitch feed unit 2. Shutter 1
A pin 16 is fitted in a long hole 17 opened in the side surface of the drive lever 5, and a pin 18 protruding from the tip of the drive lever 9 is engaged in the side surface of the shutter 15. Therefore, when the drive lever 9 swings, the shutter 15 slides in the front-back direction. The shutter 15 prevents chips (not shown) housed in the pocket of the tape 10 from jumping out of the pocket at the pickup position. Reference numeral 19 is a cover plate for guiding the tape 10 to be pulled out.

The conventional tape feeder is constructed as described above, and its operation will be described below. FIG. 8 shows the initial state. In this state, the feed pawl 6 is engaged with the tooth portion 5a of the ratchet wheel 5, and the reverse rotation prevention pawl 11 is also engaged with the tooth portion. Further, the shutter 15 is at the position advanced to the left and covers the chip picked up by the nozzle of the transfer head so as not to jump out of the pocket of the tape 10.

Now, as shown in FIG. 9, when the drive lever 9 swings downward (in the direction of arrow b), the feed pawl 6 rotates in the clockwise direction in association with this and rides on the tooth portion 5a. In conjunction with this, the shutter 15 is pushed by the pin 18 and moves rearward (arrow c) to expose the chip at the pickup position P. Therefore, the nozzle 21 of the transfer head moves up and down,
This chip is vacuum-sucked, picked up, and transferred and mounted on a substrate (not shown).

Now, as shown in FIG. 10, the drive lever 9
When is further swung in the direction of arrow b, the tip of the feed pawl 6 rides over the tooth 5a of the ratchet wheel 5 and is fitted between this tooth 5a and the next tooth 5b. In this case, since the feed claw 6 is elastically urged by the spring member 8, the teeth 5a and the teeth 5 are vigorously pushed.
Insert between b. In this way, the feed claw 6 has the tooth portion 5a.
When the ratchet wheel 5 and the sprocket 4 are rotated counterclockwise by the pitch of the tooth portion 5a, the tape 10 is fed by one pitch, and the next chip is picked up at the pickup position P. Stop.
Next, the drive lever 9 swings in the d direction to return to the initial position shown in FIG. 8, and the shutter 15 also moves in the e direction to return to the initial position. By repeating the above operation, the tape 10 is pitch-fed, and the chips stored in the pockets of the tape 10 are picked up by the nozzle 21 one after another and transferred and mounted on the substrate.

[0009]

As described above, in the conventional tape feeder, the feed claw 6 is engaged with and disengaged from the tooth portion of the ratchet wheel 5 to rotate the ratchet wheel 5, thereby feeding the tape 10 at a pitch. is there. However, the feed claw 6
9 shifts from the state of FIG. 9 to the state of FIG. 10, that is, the tip of the feed claw 6 gets over the tooth portion 5a, and the tooth portion 5a
And the next tooth portion 5b, the feed claw 6 is repulsed by the spring force of the spring member 8 and strongly collides with the front surface of the next tooth portion 5b. Therefore, the impact is transmitted to the tape 10 via the ratchet wheel 5, the sprocket 4, etc.
However, since the chips vibrate, the chips in the pockets of the tape 10 tend to pop out from the pockets.
When the chip pops out in this way, the transfer head 2
The nozzle 21 of 0 cannot pick up this chip.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a tape feeder which can eliminate the impact caused by the tape pitch feeding as described above and prevent the chips from popping out.

[0011]

To this end, the present invention is directed to a tape feeder in which a tape is pitch-fed by a pitch feed section including a sprocket, a ratchet wheel, and a feed pawl, and the feed pawl is elastically repulsed by a spring material. A stopper is provided to prevent the feed claw from rotating to prevent the tooth from colliding with the tooth portion before the collision with the tooth portion.

[0012]

According to the above construction, the feed pawl is prevented from being repelled by the spring material and colliding with the tooth portion of the ratchet wheel, and it is possible to prevent the chip from popping out of the tape pocket due to the vibration accompanying the impact of the collision. .

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a side view of a tape feeder according to an embodiment of the present invention. 2 to 7 are side views of the pitch feeding section of the tape feeder, showing the tape pitch feeding operation sequence. In each figure, the same parts as those of the conventional example shown in FIGS.
Description is omitted.

In FIG. 1, a base portion 30 is provided below the base 1.
Are installed integrally. This base 30 is the table 3
It is mounted on 1. The table 31 is the table device 3
2 is mounted on. A nut 33 provided on the lower surface of the table 31 is screwed with a horizontal feed screw 34 provided on the table device 32. When the feed screw 34 is driven by a motor (not shown) and rotated, the table 31 reciprocates on the table device 32 along the feed screw 34 in a lateral direction (a direction orthogonal to the paper surface), and a tape having a desired chip. The feeder 40 is stopped at the pickup position P of the nozzle 21 of the transfer head 20.

Next, the structure of the tape feeder 40 will be described. A holder 41 is provided at the rear of the base 1. The holder 41 holds a supply reel 42 around which the tape 10 is wound. Reference numeral 43 is a handle integrally formed with the holder 41. The operator holds the grip 43 and attaches and detaches the tape feeder 40 to and from the table 31.

A lever 44 is provided upright on the rear portion of the base 1. A clamp claw 45 is connected to the lower end of the lever 44. When the lever 44 is tilted backward as shown by the solid line in FIG. 1, the clamp claw 45 presses against the tapered surface 46a of the recess 46 formed in the table 31, and the tape feeder 40 is fixed on the table 31. Further, when the lever 44 is tilted forward as shown by the chain line, the clamp claw 45 rotates upward to separate from the taper surface 46a, and the tape feeder 40 can be removed from the table 31.

A frame 50 is erected at the center of the base 1. A take-up reel 51 is pivotally attached to the frame 50. The take-up reel 51 has the cover tape 1 which is peeled back from the upper surface of the tape 10 while the tape 10 is being pitch-fed by the pitch feeding section 2.
Wind up 0a.

Reference numeral 60 denotes a swing lever, which is pivotally mounted by a pin 61 so as to be swingable in the front-rear direction. Swing lever 6
The lower part of 0 is connected to the drive lever 9 by a pin 62. Further, a spring 63 is connected to the lower end portion, and the rocking lever 60 is elastically urged by the spring force so as to rotate counterclockwise about the pin 61. A lever 52 is coaxially connected to the take-up reel 51. The tip of the lever 52 is connected to the swing arm 60 by a spring 53, and is also connected to the frame 50 by a spring 54.

A roller 64 is mounted on the side surface of the swing lever 60. Reference numeral 70 denotes a pressing rod on the electronic component mounting device (not shown) side. When the pressing rod 70 descends and pushes the roller 64 downward, the swing lever 60 rotates clockwise around the pin 61. When the pressing rod 70 rises to release the pressed state of the roller 64, the swing lever 60 rotates counterclockwise by the spring force of the spring 63.
When the swing lever 60 swings back and forth around the pin 61 in this manner, the drive lever 9 swings around the pin 65, causing the sprocket 4 and the ratchet wheel 5 (see FIG. 2) to rotate by a pitch. Further, in conjunction with this, the arm 52 also swings in the vertical direction, and the take-up reel 51 rotates in the clockwise pitch to wind up the cover tape 10a.

In FIG. 2, a pin-shaped stopper 22 is provided on the inner surface of the drive lever 9 so as to project therefrom. This stopper 2
Reference numeral 2 defines a rotation limit at which the feed claw 6 rotates counterclockwise around the pin 7 by the spring force of the spring member 8.

The tape feeder 40 is constructed as described above, and its operation will be described below with reference to FIGS. FIG. 2 shows the initial state. In this state, the feed pawl 6 is engaged with the tooth portion 5a of the ratchet wheel 5, and the reverse rotation prevention pawl 11 is also engaged with the tooth portion of the ratchet wheel 5.
Further, the shutter 15 is at the position advanced to the left and covers the chip picked up by the nozzle of the transfer head so as not to jump out of the pocket of the tape 10. Here, the feed pawl 6 is elastically repelled in the counterclockwise direction by the spring force of the spring member 8, but since the rotation limit thereof is defined by the stopper 22, a small gap t is formed between the feed pawl 6 and the tooth portion 5a. Has been secured.

Now, in FIG. 1, when the pressing rod 70 descends to push the roller 64 downward, the swing lever 6
0 swings clockwise, and in conjunction with this, the drive lever 9 swings in the direction f in FIG. Then, similarly to the conventional example described with reference to FIG. 9, the feed pawl 6 rides on the tooth portion 5a in association with this swing, and the shutter 15 has the pin 18.
The chip at the pickup position P is exposed by being pushed by and moving backward (arrow g).

Next, as shown in FIG.
When it gets over a, the feed claw 6 vigorously rotates counterclockwise by the spring force of the spring member 8 and collides with the stopper 22. In this state, a small gap t is secured between the feed claw 6 and the next tooth portion 5b. That is, even if the feed claw 6 is elastically repulsed by the spring member 8 and rotates counterclockwise, the feed claw 6 does not collide with the next tooth portion 5b as in the conventional example shown in FIG. Therefore, the pitch feed portion 2 such as the ratchet wheel 5 and the sprocket 4 does not vibrate due to the impact, and the chip does not jump out from the pocket of the tape 10.

With the shutter 15 opened as described above, the chips in the pockets of the tape 10 are transferred to the transfer head 2
It is vacuum-adsorbed by the nozzle 21 of No. 0, picked up, and transferred and mounted on the substrate (not shown) (see FIG. 5).

Next, the pressing rod 70 shown in FIG. 1 rises to release the pressing state of the roller 64. Then swing lever 6
Zero is rotated counterclockwise by the spring force of the spring 63 and returns to the original position. Then, the drive lever 9 swings in the opposite direction (arrow h) in FIG. 6, and accordingly the shutter 15 moves in the direction of arrow i and returns to the original position. Further, in conjunction with this, the feed claw 6 swings to push up the tooth portion 5a and rotate the ratchet wheel 5 and the sprocket 4 in the clockwise direction (arrow j). Then, the tape 10 banded on the sprocket 4 is sent forward by one pitch, the chip in the next pocket moves to the pickup position and stops,
The original state shown in FIG. 7 is restored. FIG. 7 shows the same state as FIG.

As described above, the tape feeder 40
Is pushed by the pushing rod 70 and the swing lever 60 swings around the pin 61, whereby the ratchet wheel 5 and the sprocket 4 are pitch-rotated by the feed pawl 6 to feed the tape 10 by the pitch. By providing the stopper 22 that prevents the rotation of the ratchet wheel 6 before it collides with the next tooth portion of the ratchet wheel 5, the feed pawl 6 strongly collides with the next tooth portion, and the impact causes vibration. The vibration can prevent the chip from jumping out of the pocket of the tape 10.

[0027]

As described above, according to the present invention, the stopper prevents the feed claw for rotating the ratchet wheel or sprocket from colliding with the ratchet wheel by the stopper, and the impact of the collision causes the pitch feed of the sprocket or the like. It is possible to solve the problem that the part vibrates and the chip stored in the pocket of the tape jumps out, and the chip can be reliably vacuum-sucked to the nozzle of the transfer head and picked up.

[Brief description of drawings]

FIG. 1 is a side view of a tape feeder according to an embodiment of the present invention.

FIG. 2 is a side view of the pitch feeder of the tape feeder according to the embodiment of the present invention.

FIG. 3 is a side view of the pitch feeder of the tape feeder according to the embodiment of the present invention.

FIG. 4 is a side view of the pitch feeder of the tape feeder according to the embodiment of the present invention.

FIG. 5 is a side view of the pitch feeder of the tape feeder according to the embodiment of the present invention.

FIG. 6 is a side view of a pitch feeder of the tape feeder according to the embodiment of the present invention.

FIG. 7 is a side view of the pitch feeder of the tape feeder according to the embodiment of the present invention.

FIG. 8 is a side view of a pitch feeder of a conventional tape feeder.

FIG. 9 is a side view of a pitch feeder of a conventional tape feeder.

FIG. 10 is a side view of a pitch feeder of a conventional tape feeder.

[Explanation of symbols]

 1 Base 2 Pitch Feeding Part 3 Rotating Shaft 4 Sprocket 5 Ratchet Wheel 5a, 5b Tooth Part 6 Feeding Claw 8 Spring Material 9 Drive Lever 10 Tape 11 Reverse Rotation Preventing Claw 22 Stopper 40 Tape Feeder 42 Supply Reel 60 Swing Lever

Claims (1)

[Claims] 1. A base, a tape supply unit provided at a rear portion of the base, and a pitch feed unit provided at a front portion of the base for feeding the tape led out from the tape supply unit by a pitch. A tape feeder having a drive lever for pitch-driving the pitch feeding unit, wherein the pitch feeding unit is a sprocket and a ratchet wheel which are pivotally attached to the same rotary shaft to feed the tape by pitch, and the driving unit. A feed pawl that is driven by a lever and swings to engage and disengage with the tooth portion of the ratchet wheel to rotate the ratchet wheel and the sprocket with a pitch, and a spring material that elastically springs in a direction to engage the feed pawl with the tooth portion. And a reverse rotation preventing pawl that engages with the tooth portion of the ratchet wheel to prevent its reverse rotation, and the rotation of the feeding pawl before the feeding pawl is repulsed by the spring material and collides with the tooth portion. A tape feeder provided with a stopper for blocking and avoiding collision with this tooth portion.