JPH104286A - Tape feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape feeder which is kept free from a pitch-feed failure caused by that a chip is dropped in the pawls of a ratchet wheel, wherein the tape feeder pitch-feeds a tape where chips are housed with a sprocket or a ratchet wheel. SOLUTION: A sprocket 51 and a ratchet wheel 53 are coaxially journaled at the front part of the pedestal 41. A drive lever 55 is swung to pitch-rotate the ratchet wheel 53 with a feed pawl 83, a tape 10 put on the sprocket 51 is pitch-fed onto the pedestal 41. A ring member 90 is provided in the upper periphery of the ratchet wheel 53 between the feed pawl 83 and the reverse rotation stopping pawl 84. The ring member 90 is mounted between the disc 55a of the drive lever 55 and the sprocket 51. Therefore, a chip falling off onto the sprocket 51 or the ratchet wheel 53 is restrained from dropping between the pawls 53a of the ratchet wheel 53 to impede the rotation of the ratchet wheel 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape feeder used for an electronic component mounting apparatus for automatically mounting a chip on a substrate.

[0002]

2. Description of the Related Art In an electronic component mounting apparatus, an electronic component provided in an electronic component supply unit is vacuum-adsorbed to a nozzle of a transfer head, picked up, and mounted at a predetermined coordinate position on a substrate. Various types of electronic component supply units are used, but tape feeders are frequently used for relatively small chip-type electronic components (chips) such as chip capacitors and resistor chips. Have been.

Hereinafter, a conventional tape feeder will be described. FIG. 9 is a side view of the tip of a conventional tape feeder. A sprocket 2 and a ratchet wheel 3 are integrally mounted on the same rotating shaft 4 at the tip of the base 1. The rotating shaft 4
Is mounted with a drive lever 5. The drive lever 5 is connected to a rod 7 via a pin 6. Drive lever 5
Is provided with a feed claw 8. The feed claw 8 is engaged with and disengaged from a claw 3 a formed on the peripheral surface of the ratchet wheel 3. Further, a reverse rotation preventing claw 9 is pivotally mounted on the base 1. The reverse rotation preventing claw 9 is the ratchet wheel 3
And prevents the ratchet wheel 3 from rotating in the reverse direction (clockwise in FIG. 9) with respect to the pitch feed direction of the tape 10.

[0004] On the upper surface of the base 1, a peeling claw 73 serving as a cover member of the tape 10 is provided. Tape 10
A cover tape 10b is attached to the upper surface of the main tape 10a. Pockets (not shown) are formed at intervals in the main tape 10a, and chips are stored in the pockets one by one. Reference numeral 11 denotes a transfer head provided in the electronic component mounting apparatus, and 12 denotes a nozzle.

[0005] The conventional tape feeder is configured as described above, and its operation will be described next. When the rod 7 is reciprocated in the direction a by being driven by the pressing rod (not shown), the drive lever 5 swings in the direction b, whereby the feed claw 8 also swings, and the ratchet 3 is moved one by one. Rotate pitch clockwise. Then, the sprocket 2 also rotates pitchwise in the counterclockwise direction, and the tape 10 tuned to the sprocket 2 is
The pitch is fed upward in the c direction. Thereby, the cover tape 10b is peeled from the main tape 10a in the direction d.

When the cover tape 10b is peeled off from the main tape 10a, the chip in the pocket is exposed and the nozzle 1
This chip is picked up by vacuum suction by the vertical movement of 2. Next, the transfer head 11 moves above the substrate (not shown), and mounts the chip at a predetermined coordinate position on the substrate. By repeating the above operation, the chips stored in the pockets of the main tape 10a are successively mounted on the substrate.

[0007]

By the way, the nozzle 12
In some cases, chips may fall onto the sprocket 2 or the ratchet wheel 3 due to a pick-up error or the like. In recent years, chips have been increasingly miniaturized, and some of them have a small side of 1 mm or less in length. When such a small chip falls, it is easy to enter between the claws 3 a of the ratchet wheel 3. P is a chip inserted between the claws 3a. The tip P moves to the engagement position of the reverse rotation preventing claw 9 and the feeding claw 8 by the pitch rotation of the ratchet wheel 3 in the counterclockwise direction, and the engaging operation of the reverse rotation preventing claw 9 and the feeding claw 8 with the claw 3a. Inhibits. As a result, normal pitch rotation of the ratchet wheel 3 and the sprocket 2 becomes impossible, the pitch of the tape 10 is not correctly fed in the c direction, and a problem that the nozzle 12 cannot pick up a chip is likely to occur.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a tape feeder which can prevent a chip from dropping into a hook of a ratchet wheel and making it impossible to feed a tape normally.

[0009]

SUMMARY OF THE INVENTION The present invention provides a pitch feeding means for feeding a tape on a base, a sprocket mounted on a rotating shaft for feeding the tape in a pitch, and a sprocket rotating integrally with the sprocket. A ratchet wheel, a drive lever disposed on the outer surface of the ratchet wheel, and forward / reverse pitch rotating means for swinging the drive lever forward / backward about the rotation axis;
A feed pawl that is pivotally mounted on a drive lever and engages with the pawl of the ratchet to rotate the pawl and the sprocket by a pitch; and a reverse pawl that engages with the pawl of the ratchet to prevent reverse rotation of the ratchet. A rotation preventing pawl; and a ring member for covering an upper peripheral surface of the ratchet between the feed pawl and the reverse rotation preventing pawl.

[0010]

According to the present invention having the above structure, the tip is prevented from dropping between the claws of the ratchet wheel by the ring member which rotates integrally with the drive lever in the forward and reverse pitches. Therefore, the ratchet wheel and the sprocket normally rotate the pitch and feed the tape by the pitch.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of an electronic component mounting apparatus according to an embodiment of the present invention, FIG. 2 is a side view of the tape feeder, FIG. 3 is a side view of a tip end of the tape feeder, and FIG. 5 is an exploded perspective view of a tape pitch feeding means of the tape feeder, FIG. 6 is a cross-sectional view of the tip of the tape feeder, and FIGS. 7 and 8 are a part of the tip of the tape feeder. It is a notch side view.

First, the overall structure of the electronic component mounting apparatus will be described with reference to FIG. In FIG. 1, an X
A table 21, a Y table 22, and a Z table 23 are installed in a stack, and a substrate 24 is mounted on the Z table 23. Therefore, when the X table 21 and the Y table 22 are driven, the substrate 24 moves horizontally in the X direction and the Y direction, and when the Z table 23 is driven, the substrate 24 moves up and down, and the substrate 24 is positioned.

Above the substrate 24, there is provided a rotary head 25 which is driven by a driving unit 25a and rotates intermittently. The rotary head 25 has a number of transfer heads 26 in the circumferential direction. The transfer head 26 has a nozzle 27 for vacuum-sucking a chip. The drive unit 25
A is provided with a pressing rod 28 that moves up and down by receiving power from the driving unit 25a.

Reference numeral 30 denotes a base on which a movable table 31 is mounted. Reference numeral 32 denotes a drive system for moving the movable table 31 on the base 30 in the X direction (a direction orthogonal to the paper surface).
b, feed nut 32c and the like. A large number of tape feeders 40 are arranged on the movable table 31 in the X direction. When the movable table 31 moves on the base 30 in the X direction, the tape feeder 40 provided with a chip of a desired type moves directly below the pressing rod 28. Then, the tape feed of the tape feeder 40 is performed by the vertical movement of the pressing rod 28, and the nozzle 27 of the transfer head 26 picks up the chip stored in the tape of the tape feeder 40 by vacuum suction and the rotary head 25. Then, the picked-up chip is moved to the position above the substrate 24 and mounted on the substrate 24.

Next, the tape feeder 40 will be described. In FIG. 2, a support 4 is provided at the center of a long plate-shaped base 41.
2 is erected, and the support 42 is provided with a cover tape 10b.
A take-up reel 43 for taking up is mounted on the shaft. In FIG. 1, a bracket 44 is attached to a rear portion of the base 41, and a supply reel 45 is mounted on the bracket 44. The tape 10 is wound around the supply reel 45.

In FIG. 2, at the front of the base 41, there is provided a pitch feed means 50 for feeding the tape 10 on the base 41 at a pitch. Hereinafter, the pitch feeding means 50 will be described with reference to FIGS. In FIG.
Reference numeral 51 denotes a sprocket, and a plurality of pins 52 projecting from a peripheral surface of the sprocket into a pin hole 10c (FIG. 4) formed in the tape 10 at a pitch. The tape 10 is adjusted by a sprocket 51, and the sprocket 51 is pitch-rotated in a counterclockwise direction, so that the tape 10 is pitch-fed forward on the base 41. Reference numeral 53 denotes a ratchet wheel, on which the pawl 5 is provided.
3a are formed. As shown in FIG. 6, the sprocket 51 and the ratchet wheel 53 are rotatably mounted on the base 41 with the same rotating shaft 54. Sprocket 51 and ratchet wheel 5
3 rotates integrally.

2 and 3, reference numeral 55 denotes a drive lever, which is integrally provided with a disk portion 55a for covering the outer surface of the ratchet wheel 53. The disk portion 55a is rotatably mounted on the rotating shaft 54. The rear end of the drive lever 55 is pivotally attached to the tip of a rod 58 by a pin 57. FIG.
In the figure, reference numeral 59 denotes a swinging plate, which is connected to the rear end of the rod 58 by a pin 60. Reference numeral 61 denotes a frame which is provided upright at the center of the base 41, and a swing plate 59 is rotatably mounted on the frame 61 with pins 62. 63 is the rocking plate 5
A spring for urging 9 in a counterclockwise direction, 64 is a swing plate 5
9 is a stopper pin for defining a rotation limit in the counterclockwise direction of No. 9;

A key-shaped lever 66 is mounted on the support column 42 on the same shaft 65 as the take-up reel 43. A one-way clutch 65a transmits only the counterclockwise movement of the swinging movement of the lever 66 to the take-up reel 43.
The tip of the lever 66 and the swing plate 59 are connected by a spring 67. The lower ends of the frame 61 and the lever 66 are connected by a spring 68.

3 and 4, the distal end of a horizontal shaft 71 is connected to the disk portion 55a by a pin 72. A cover plate 73 has a pin 7 at the rear end of the shaft 71.
4 are connected. The cover plate 73 covers the upper surface of the tape 10 that is pitch-fed on the upper surface of the base 41. The tip of the cover plate 73 is a sharp peeling claw 73a. Cover tape 1 stuck on the upper surface of main tape 10a
0b is folded back by the peeling claw 73a to form the main tape 10b.
b and is wound up on the take-up reel 43. A lever 75 is supported at the center of the shaft 71 so as to freely move up and down. The lever 75 is urged downward by a spring 76 to press the cover plate 73 against the tape 10.

In FIGS. 3 and 4, a box 80 is mounted at the front of the base 41. A holding plate 81 and a wire spring 82 are pivotally mounted on the box 80. Presser plate 81
The main tape 10a running at a pitch along the sprocket 51 is repelled by the wire spring 82 and pressed against the sprocket 51 so that the main tape 10a does not separate from the sprocket 51.

3 and 7, the drive lever 55
Is provided with a feed claw 83. The feed claw 83 is the claw wheel 5
The third claw 53a is disengaged. A reverse rotation preventing claw 82 is axially mounted on a side surface of the base 41. The reverse rotation preventing claw 82 engages with the claw 53a of the ratchet wheel 53, and prevents the ratchet wheel 53 and the sprocket 51 from rotating in the opposite direction (clockwise) to the feeding direction of the tape 10.

In FIG. 5, reference numeral 90 denotes an arc-shaped ring member, which is mounted so as to be sandwiched between the inner surface of the disk portion 55a and the outer surface of the sprocket 51. As shown in FIG.
The ring member 90 covers the upper peripheral surface of the ratchet wheel 53 between the feed pawl 83 and the reverse rotation preventing pawl 84 (see also FIG. 6). In FIGS. 7 and 8, the ring member 90 is painted black for easy understanding. Both ends of the ring member 90 are in contact with pins 91 erected on the disk portion 55a, and swing with the drive lever 55 in the forward and reverse directions. 2, a cutter unit 92 is provided in front of the base 41. The cutter unit 92 finely cuts the empty main tape 10a sent forward by the sprocket 51 with the lower blade 94 at the upper blade 93.

The tape feeder 40 is constructed as described above, and its operation will be described below. 2, when the pressing rod 28 is lowered (arrow A) and presses the upper surface of the rocking plate 59, the rocking plate 59 rotates around the pin 62 (arrow B). Then, the rod 58 moves forward (arrow C), and the drive lever 55 slightly rotates clockwise (arrow D).

Next, when the pressing rod 28 rises (arrow E in FIG. 2), the swinging plate 59 rotates in the opposite direction to the previous direction due to the spring force of the spring 63 (arrow F). Then the rod 58
Moves backward (arrow G), and the drive lever 55 slightly rotates counterclockwise (arrow H). When the swing plate 59 swings in the directions of the arrows B and F as described above, the lever 66 connected to the swing plate 59 via the spring 67 swings about the pin 65, thereby winding up. The reel 43 rotates the pitch only in the direction of the arrow M and turns the cover tape 10b into the main tape 1.
Winding while peeling from 0a.

FIG. 7 shows a state in which the drive lever 55 has been rotated in the direction of arrow H. FIG.
5 shows a state rotated in the direction of arrow D. When the drive lever 55 swings in the directions of arrows D and H in this manner, the feed pawl 83 integral with the drive lever 55 also swings in the same direction, and the ratchet wheel 53 and the sprocket integrated with the ratchet wheel 53 move in the arrow I direction. Rotate the pitch.

The pitch rotation of the sprocket 51 in the direction of arrow I in this manner causes the tape 10 to be pitch-forward-forwarded (arrow J). When the drive lever 55 swings in the directions of arrows D and H, the cover plate 73 connected to the disk portion 55a via the shaft 71 repeatedly moves forward and backward (arrow K). 10b is peeled off from the main tape 10a by a peeling claw 73a and wound up on a take-up reel 43 (arrow L).

FIG. 8 shows a state in which the cover plate 73 has receded to the right in the drawing. In this state, the main tape 10a is exposed between the peeling claw 73a and the pressing plate 81 at t. Then, the nozzle 27 of the transfer head 26 vacuum-adsorbs and picks up the chip stored in the pocket of the exposed main tape 10a. Then, the transfer head 26 moves above the substrate 24 along the rotary head 25 (FIG. 1), and mounts the chip on the substrate 24. In addition, the main tape 10a from which the chips are picked up and emptied is sent forward as it is in FIG. 2 and is finely cut by the upper blade 93 and the lower blade 93 of the cutter unit 92. By repeating the above operation, the chips stored in the tape 10 are mounted on the substrate 24 one after another.

As described above, the tape 10 is pitch-fed by the pitch rotation of the sprocket 51 and the ratchet wheel 53, and the nozzle 27 of the transfer head 26 vacuum-adsorbs the chip stored in the pocket of the main tape 10a. The nozzle 27 fails to pick up the chip, and the chip is picked up on the sprocket 51 or the ratchet wheel 5.
3 may be dropped. Alternatively, the holding member 81 is rotated counterclockwise in FIG.
Is released, the chip in the pocket of the main tape 10a may fall onto the sprocket 51 or the ratchet wheel 53 when the tape 10 on the base 1 is replaced. When the chip falls in this manner, the chip is moved to the ratchet wheel 53.
Falls between the claws 53a of the hook, and the ratchet wheel 53 by the feed claws 83.
As described above, the trouble that the pitch rotation of the tape 10 cannot be performed and the tape 10 cannot be normally pitch-fed is generated.

However, the tape feeder 40
As shown in FIGS. 7 and 8, the upper peripheral surface of the ratchet wheel 53 between the feed pawl 83 and the reverse rotation preventing pawl 84 has a disc portion 55.
a, the tip falls between the claws 53a of the ratchet wheel 53,
The above-mentioned trouble does not occur, and the tape 10 can always be normally pitch-fed on the base 41 while the sprocket 51 and the ratchet wheel 53 are accurately rotated by the pitch.

The present invention is not limited to the above embodiment. For example, the ring member 90 and the drive lever may be integrally formed, and similarly, the sprocket 51 and the ratchet wheel 53 may be integrally formed. In addition, the ring member 90 does not necessarily swing with the drive lever 55, and in essence, covers the peripheral surface of the ratchet wheel 53 within a range that does not prevent the feed pawl 83 and the reverse rotation preventing pawl 84 from engaging with the ratchet wheel 53. Anything should do.

[0031]

According to the present invention, the upper peripheral surface of the ratchet between the feed pawl and the reverse rotation preventing pawl is provided with both ends attached to the driving lever and rotating forward and reverse pitches integrally with the driving lever. An arc-shaped ring member that covers the tape prevents the tip from dropping between the claws of the ratchet wheel, and ensures that the sprocket or ratchet wheel always rotates the pitch, and that the tape is normally pitch-fed. The chips stored in the tape can be supplied to the nozzles of the transfer head.

[Brief description of the drawings]

FIG. 1 is a side view of an electronic component mounting apparatus according to an embodiment of the present invention.

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

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

FIG. 4 is a perspective view of a distal end portion of the tape feeder according to the embodiment of the present invention.

FIG. 5 is an exploded perspective view of a tape pitch feed unit of the tape feeder according to the embodiment of the present invention.

FIG. 6 is a sectional view of a tip portion of the tape feeder according to the embodiment of the present invention;

FIG. 7 is a partially cutaway side view of the tip of the tape feeder according to the embodiment of the present invention;

FIG. 8 is a partially cut-away side view of the tip of the tape feeder according to the embodiment of the present invention.

FIG. 9 is a side view of the tip of a conventional tape feeder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tape 10a Main tape 10b Cover tape 40 Tape feeder 41 Base 43 Supply reel 50 Pitch feed means 51 Sprocket 53 Claw wheel 53a Claw 55 Drive lever 55a Disk portion 83 Feed claw 84 Reverse rotation prevention claw 90 Ring member

Claims (1)

[Claims] 1. A chip stored in a tape, comprising: a base; a supply reel for feeding the tape to the base; and a pitch feeding means provided at a front portion of the base to feed the tape on the base at a pitch. A feeder that feeds the tape to a nozzle of a transfer head, wherein the pitch feeder is mounted on a rotating shaft to feed the tape in pitches; a ratchet wheel that rotates integrally with the sprocket; A drive lever disposed on the outer surface of the ratchet wheel, forward / reverse pitch rotation means for swinging the drive lever forward / reverse about the rotation axis, and a driving lever A feed claw that is disengaged to rotate the ratchet wheel and the sprocket in a pitch direction in a tape feed direction; a reverse rotation preventing claw that engages with the pawl of the ratchet wheel to prevent reverse rotation of the ratchet wheel; Between the reverse rotation preventing claw Kicking tape feeder, characterized in that a ring member covering the circumferential surface of the upper of the ratchet wheel.