JPH1174689A - Tape feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To position a part with higher precision to a part taking-out position while preventing a part from erecting or popping. SOLUTION: A tape feeder 1 is so configured that, while a tape 5 in which parts are housed with a constant interval is guided to a part taking-out part 10 by a tape feeding mechanism 12 which is operated with an ultrasonic wave motor 22, that it is so kept at the part taking-out part 10, for a part to be taken out. Then, with such operation condition as feeding speed, etc., appropriate for the kind of supplied part set, the motor 22 is driven under an appropriate condition to feed the tape 5.

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 sequentially supplying components to a predetermined component pick-up position using a tape as a carrier for mounting electronic components on a substrate in a mounting machine.

[0002]

2. Description of the Related Art Conventionally, a tape feeder in which an electronic component is fed to a predetermined component pick-up position using a tape as a carrier and picked up by a component suction nozzle is generally known.

[0003] The tape feeder is composed of a tape body and a cover tape, and holds a tape containing a large number of components at regular intervals and wound around a reel. The component is guided to the component take-out section, and the component take-out section is configured to be able to take out the component by peeling off the cover tape from the tape body. Each time a component is picked up by the nozzle provided on the head of the mounting machine,
The tape is intermittently fed by a feeding mechanism, and components are successively taken out by a component take-out unit.

[0004] As the above feeding mechanism, a sprocket connected to a ratchet rotating mechanism is engaged with a tape.
A mainstream method is to mechanically feed out a tape by operating a ratchet rotation mechanism and rotating a sprocket in accordance with the vertical movement of a nozzle member or the like for picking up parts.

[0005]

However, in the conventional feeding mechanism, the lever interlocking with the ratchet rotating mechanism is swung along with the raising / lowering operation of the nozzle, so that the tape can be uniformly driven at a constant speed regardless of the type of the component. Because it is an extension
The impact of the impact (acceleration) and the feeding speed when feeding the tape may not be negligible depending on the type of components stored in the tape. Particularly, in the case of extremely small chip components, the components may stand inside the component storage unit, Alternatively, there is a possibility that components may fly out of the component storage unit.

For this reason, recently, instead of the method of mechanically feeding out the tape as in the ratchet rotating mechanism, it has been considered to electrically feed out the tape by rotating the sprocket with a servomotor. According to this, the impact at the time of feeding the tape can be reduced, and the feeding speed of the tape can be adjusted according to the type of the component. Therefore, it is possible to effectively prevent a component from jumping out of the component storage unit.

However, with the recent miniaturization of electronic components,
It is required to position the component with extremely high precision with respect to the component take-out position, and therefore, it is necessary to feed out the tape with higher precision.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a tape which can position a component with respect to a component pick-up position with higher accuracy while preventing standing of the component or jumping out of the component. It is intended to provide a feeder.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a tape accommodating components at predetermined intervals is led out to a component extracting portion at a predetermined timing, and the component extracting portion is set in a state where the component can be extracted at the component extracting portion. In a tape feeder for holding a tape, a rotating body engageable with the tape is provided, and the tape is fed toward a component pick-up unit in accordance with the rotation of the rotating body. It is designed to be driven by

According to this apparatus, since the tape is electrically fed by driving the motor, the tape feeding speed and the like can be appropriately adjusted to a speed suitable for the kind of the component. In particular, because a highly responsive ultrasonic motor is used,
Even if driving and stopping of the motor are frequently repeated at the time of tape feeding, a predetermined fixed amount of tape can be fed accurately.

In this tape feeder, a disk on which marks to be detected are arranged in the circumferential direction is provided integrally with the rotating body, and the mark is rotated by rotating the disk relative to the disk in the circumferential direction of the disk. A pair of position detectors to be detected are provided, and each position detector is arranged offset in the circumferential direction of the disk so that a time difference occurs in mark detection by each position detector, and based on a signal from the pair of position detectors. If the control means for controlling the driving of the ultrasonic motor is provided, acceleration can be detected in real time by a signal from the pair of position detectors, and this is fed back to the motor control so that the speed closer to the target value can be detected. It becomes possible to control the drive of the motor in the above manner.

[0012]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall configuration of a tape feeder according to the present invention. As shown in FIG. 1, the tape feeder 1 has a front (left side in FIG. 2) main body 2 having a component take-out section 10 to be described later, and a reel holding section 3 on the rear side. The tape 5 containing a large number of components is held in a state wound around a reel 4.

The tape feeder 1 includes the main body 1
a, it is removably attached to a feeder installation table 6 provided in the mounting machine via a.

More specifically, the feeder mounting table 6 is provided with a base 6a and a fixed table 6b erected on the base 6a, and a large number of mounting portions for mounting the tape feeder 1 are shown in FIG. Are provided side by side in a direction perpendicular to the plane of the drawing. In each mounting portion, a positioning shaft 7 having an arc-shaped surface is fixed to a base 6a (see FIG. 5), and a positioning hole 8 and a swingable clamp 9 are fixed to a fixing base 6b. It is provided in. Then, the main body 2 of the tape feeder 1 is placed on the shaft 7 via an inverted V-shaped groove 2a (see FIG. 5) formed on the lower surface of the main body 2 and protrudes from the tip of the main body 2. The tape feeder 1 is positioned at the mounting portion by inserting the pin 2b into the positioning hole 8, and the clamp 9 is set in the engaging portion 2c provided at the upper end of the main body 2 in this state. As a result, the tape feeder 1 is attached and fixed to the feeder installation table 6. The positioning hole 8 is formed by a vertically long hole, and the main body 2 is reliably brought into contact with the shaft 7 via the groove 2a in a state where the clamp 9 is set.

A component take-out portion 10 is provided in front of the main body 2, and the tape 5 led out from the reel 4 is guided to the component take-out portion 10 via a tape guide member 11 at the rear of the main body. Further, the main body 2 is provided with a tape feeding mechanism 12, a cover tape take-off mechanism 13, and a tape main body discharge guide section 14, which will be described later.

The tape 5 derived from the reel 4 is
As shown in FIG. 2 and FIG. 3, it is composed of a tape main body 5a and a cover tape 5b. In the tape main body 5a, a large number of component storage portions 5c that are open at the top are arranged at regular intervals, and the components P are stored in each of the component storage portions 5c. , A large number of engagement holes 5d are arranged at regular intervals. The cover tape 5b is adhered to the upper surface of the tape 5 so as to close the component storage sections 5c of the tape main body 5a from above.
Then, the cover tape 5 is
b is peeled off from the tape main body 5a so that the component P can be taken out. When the component P is sucked and taken out by the component sucking nozzle N mounted on the mounting machine, the tape feeding mechanism 12 The tape 5 is fed out by a fixed amount.

The tape feeding mechanism 12 (hereinafter, abbreviated as the feeding mechanism 12) includes an annular sprocket 21 located below the component pick-up section 10, and the sprocket 21.
And a motor 22 for rotationally driving the motor. The sprocket 21 is disposed so as to engage with the engaging hole 5d of the tape 5 guided to the component take-out portion 10. The sprocket 21 is rotated by the drive of the motor 22, and the tape 5 is rotated. It is designed to run out.

Although not shown in detail, the motor 22 is a so-called annular ultrasonic motor having an annular rotor 22a as shown in FIG. To rotate integrally with the rotor 22a. The motor 22 has a flat shape as shown in FIG.
The sprocket 21 is provided integrally with the sprocket 21 in a recess 2 d formed in the main body 2.

The sprocket 21 is provided with a large number of through holes 21a arranged at predetermined intervals in the circumferential direction.
Sensors 24 and 25 for detecting the through holes 21 a are attached to the main body 2. Each of the sensors 24 and 25 is a photosensor having a light irradiating portion and a light receiving portion with the sprocket 21 interposed therebetween, and receives the irradiation light transmitted through the through hole 21a by the light receiving portion, thereby detecting the light emitted from the through hole 21a. The position is detected, and thereby a pulse is obtained. The feeding amount, speed, and the like of the tape 5 are controlled based on the pulse. That is, the sprocket 21 is provided as the rotating body and the disk of the present application, the through holes 21a are arranged as marks to be detected, and the sensors 24 and 25 are provided as position detectors. The sensors 24 and 25 are offset from each other in the circumferential direction of the sprocket 21 so that there is a time difference between the pulses obtained by the sensors 24 and 25.

The cover tape 5b separated from the tape main body 5a by the component take-out section 10 is connected to the cover take-up mechanism 1
3 (hereinafter, abbreviated as a take-off mechanism 13), is sent to a processing case (not shown), and the cover tape 5b is peeled off from the tape main body 5a by the pulling force of the take-up mechanism 13. .

As shown in FIGS. 1 and 6, the take-off mechanism 13 is provided at a lower rear portion of the main body 2, and is provided with a hard drive roller 31 which is driven to rotate by a motor 30, and which comes into contact with the hard drive roller 31. And a driven soft driven roller 32. The driven roller 32 is pivotally supported by a swingable frame 33, and the driven roller 32 is pressed against the driving roller 31 by biasing the frame 33 by spring pressure. Then, the cover tape 5b pulled out from the component take-out part 10 is guided by the guide rollers 35,
It is guided between the rollers 31 and 32 via 36.
Thus, when the motor 30 is driven, both rollers 3
1, 32 rotate so that the cover tape 5b is picked up. Although not shown, the rollers 31
A torque limiter is interposed between the motor and the output shaft of the motor 30, so that the cover tape 5b can be taken off with a constant tension.

FIGS. 2 and 3 show the structure of the component take-out unit 10. FIG. In these figures, the component take-out unit 10
Is provided with a tape guide groove 19 that opens upward in the upper part of the main body 2, and a cover member 15 that is provided above the tape guide groove 19, and is led out from the reel 5 and led to the component take-out unit 10. The tape 5 moves under the cover member 15 along the tape guide groove 19.

The cover member 15 is formed with an opening 16 for taking out a component at a central portion thereof, and a cover tape 5b is formed at a rear end portion (right end portion in FIGS. 2 and 3) of the opening portion 16. It is folded back and peeled off. When the component storage portion 5c of the tape main body 5a reaches the position of the opening portion 16 while the cover tape 5b is peeled off, the component storage portion 5c is opened upward, and the component P can be taken out by the nozzle N. It has become.

At the end of the main body 2, there is provided a tape main body discharge guide section 14 connected to the tape guide groove 19, and the used tape main body 5a which has passed through the component take-out section 10 is used to discharge the tape. It is guided to the lower rear portion of the main body 2 via the guide unit 14 and is sent to a processing case (not shown) together with the cover tape 5b pulled by the pulling mechanism 13.

The tape feeder 1 constructed as described above
Then, while the tape 5 is fed out along the tape guide groove 19 by the driving of the feeding mechanism 12, the take-up mechanism 1
By driving the cover 3, the cover tape 5b is pulled out, so that the component take-out unit 10 can take out the component P. Then, as the component P is taken out by the nozzle N, the tape 5 is fed out intermittently, whereby the component is continuously supplied to the component take-out unit 10.

The operation of feeding the tape 5 is performed by controlling the motors 22 and 30 by a control device (not shown). In particular, in the operation of feeding the tape 5 by the feeding mechanism 12, the motor 22 is controlled to a predetermined position. Is driven at a constant speed, and is decelerated when reaching the deceleration start position, at the target position, that is, at the position where the next component storage unit 5c is arranged at the predetermined component extraction position of the component extraction unit 10. The motor 22 is controlled so as to be stopped.

At this time, the origin position of the sprocket 21 is determined based on one of the sensors 24 and 25 (or the sensor 25), and the deceleration is performed based on the number of pulses obtained as the sprocket 21 rotates. Start position,
The stop position and the like are detected, and the driving of the motor 22 is controlled. In such drive control of the motor 22, the speed and the acceleration / deceleration are detected in real time based on the time difference between the pulses obtained by the respective sensors 24 and 25, and the motor 22 is feedback-controlled in accordance with the detected speed and the acceleration. In addition, the deceleration from the deceleration start position to the stop position is controlled with higher accuracy.

According to the tape feeder 1 described above, the tape 5 is fed by the drive of the motor 22 as described above, so that the feeding speed of the tape 5 can be appropriately adjusted. Therefore, when the tape is fed, the component P stands in the component storage unit 5c, or the component P is moved to the component storage unit 5c.
The operating conditions such as the feeding speed suitable for the type of parts are set in advance so that the tape 5 does not protrude from the outside. During the mounting operation, the motor 22 is controlled based on the operating conditions to feed the tape 5. By doing so, it is possible to reliably prevent the occurrence of standing parts and supply the parts in a good state.

Further, in the tape feeder 1, since an ultrasonic motor (motor 22) having excellent responsiveness is used as a driving source of the feeding mechanism 12, an error in the tape feeding amount due to a response delay is effectively suppressed. be able to. Therefore, compared to a general tape feeder using an electromagnetic motor as a drive source of the feeding mechanism, the nozzle N
The position of the component P at the component take-out position can be performed with higher accuracy. Further, by controlling the speed and acceleration / deceleration of the motor 22 based on the signals from the pair of sensors 24 and 25 as described above, the accuracy of the positioning (feed pitch) can be further improved. In addition, the annular ultrasonic motor has a flat shape and is hardly bulky as shown in FIG. 4, so that the thickness of the tape feeder 1 can be effectively suppressed, thereby increasing the space efficiency of the tape feeder 1. There is also the advantage that you can.

The tape feeder 1 is an embodiment of the tape feeder 1 according to the present invention, and its specific configuration can be changed as appropriate without departing from the gist of the present invention.

For example, in the tape feeder 1, the sprocket 21 is directly attached to the rotor 22a of the ultrasonic motor (motor 22).
1 and the motor 22 may be connected via a speed reduction mechanism. That is, since the ultrasonic motor has a relatively low torque, if the sprocket rocket 21 is directly attached to the rotor 22a as described above, the torque required by the feeding mechanism 12 may not be able to be exerted. for that reason,
When the torque required in the feeding mechanism 12 is relatively high, the sprocket 21 and the motor 22 may be connected via the speed reduction mechanism as described above to increase the torque. In this case, for example, as shown in FIGS. 7 and 8, a disc-shaped sprocket 21 with a pulley 40 attached thereto is used.
Is rotatably supported by the main body 2 via a support shaft 41, and the motor 22 having a pulley 42 attached to a rotor 22a is disposed beside the pulley 40.
It is conceivable that the timing belt 43 is worn over a period of time.

In the mounting structure of the tape feeder 1 to the feeder mounting table 6, the tape feeder 1 is provided on the base 6a through an inverted V-shaped groove 2a formed on the lower surface of the main body 2. However, the tape feeder 1 may be directly mounted on the base 6a. However, according to the mounting structure as in the embodiment, there is an advantage that the positioning of the tape feeder 1 can be performed extremely easily. In addition, there is an advantage that it is difficult for a component or other foreign matter dropped due to a suction error to be caught between the tape feeder 1 and the base 6a, so that it is difficult to cause a defective mounting of the tape feeder 1. It should be noted that such a positioning structure can be adopted as a structure for positioning between the main body and the fixed base 6a, as well as between the main body 2 and the base 6a. That is, a vertical shaft having an arc-shaped surface is attached to the fixing base 6b, and a vertical V
A tape-shaped groove 2a may be formed, and the tape feeder 1 may be attached to the feeder installation table 6 in a state where the tip of the main body 2 is pressed against the shaft through the groove 2a.

Further, in the tape feeder 1, the motor 22 of the feeding mechanism 12 is feedback-controlled based on the pulses obtained by the two sensors 24 and 25. For example, a single sensor (see FIG. 7) ), The configuration and control may be simplified by obtaining a pulse. However, if the motor 22 is controlled based on the pulses obtained by the two sensors 24 and 25 as in the above-described embodiment, the speed change is detected by detecting the time difference between the pulses obtained by the sensors 24 and 25. More real-time detection and feedback to motor control are possible. Therefore, from the viewpoint of more accurately controlling the feeding speed of the tape 5 by the feeding mechanism 12 and the like, the two sensors 2 as in the above embodiment are used.
Preferably, a pulse is obtained at 4,25. The control of the motor does not necessarily need to be feedback control, but may be sequence control. Further, in the tape feeder 1, the through hole 21a formed in the sprocket 21 is detected by a photo sensor,
The feeding amount of the tape 5 is controlled based on this. For example, a magnetic drum is mounted on the sprocket 21 and a magnetic sensor is arranged opposite to the magnetic drum to detect a change in magnetic flux by the magnetic sensor. May be used to control the amount of tape 5 to be fed out.

In the tape feeder for feeding a tape by driving a motor as described above, it is conceivable to use a stepping motor which can easily generate torque and is easily controlled, instead of using an ultrasonic motor as a motor. In addition, the stepping motor consumes electric power even in a stopped state during operation, so that the power consumption is extremely large and the running cost is likely to increase. In this regard, the power consumption of the ultrasonic motor is extremely small, and the tape feeder is also useful in this regard.

[0036]

As described above, according to the present invention, it is possible to take out a tape containing components at predetermined intervals to a component extracting portion at a predetermined timing, and to take out a component at the component extracting portion. In a tape feeder for holding the tape, a rotating body that can be engaged with the tape is provided, and the tape is fed toward a component pick-up portion in accordance with the rotation of the rotating body. Since the drive is performed by the sonic motor, it is possible to reliably prevent the occurrence of standing parts and the like and to supply the parts in a good state. In addition, since an ultrasonic motor having higher responsiveness than an electromagnetic motor is used, even when the motor is frequently driven and stopped at the time of tape feeding, constant conditions such as the tape feeding amount can be accurately maintained. .
Therefore, it is possible to more accurately position the component at the component removal position.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a tape feeder according to the present invention.

FIG. 2 is a plan view showing a component take-out part of the tape feeder.

FIG. 3 is a cross-sectional view showing a component take-out part of the tape feeder.

FIG. 4 is a sectional view taken along the line AA of FIG. 1 showing the tape feeding mechanism.

FIG. 5 is a cross-sectional view taken along the line BB of FIG. 1 for explaining a mounting structure of the tape feeder to the feeder installation table.

FIG. 6 is a sectional view taken along line CC of FIG. 1 showing the tape take-off mechanism.

FIG. 7 is a configuration diagram (main part) showing another example of the tape feeder according to the present invention.

8 is a sectional view taken along the line DD of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tape feeder main body 4 Reel 5 Tape 5a Tape main body 5b Cover tape 5c Parts storage part 10 Parts take-out part 12 Tape feeding mechanism 13 Tape take-off mechanism 22 Motor P parts N nozzle

Claims (2)

[Claims] 1. A tape feeder for holding a tape containing components at predetermined intervals to a component extracting unit at a predetermined timing and holding the tape in a state where components can be extracted by the component extracting unit. A rotating body that can be engaged with the tape is provided, and the tape is fed toward a component take-out unit according to the rotation of the rotating body, and the rotating body is driven by an ultrasonic motor. Characterized tape feeder. 2. A disk for arranging marks to be detected in a circumferential direction integrally with the rotating body, and a position for detecting the marks by rotating relative to the disk in a circumferential direction of the disk. A pair of detectors is provided, and each position detector is arranged offset in the circumferential direction of the disk so that a time difference occurs in the mark detection by each position detector, and based on a signal from the pair of position detectors, 2. The tape feeder according to claim 1, further comprising control means for controlling driving of the ultrasonic motor.