JP2827525B2 - Error detection method for electronic component mounting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting an abnormality in an electronic component mounting apparatus, and to automatically detect the presence or absence of an abnormality in the apparatus during operation of the apparatus.

[0002]

2. Description of the Related Art As a high-speed mounting apparatus for mounting electronic components on a substrate at a high speed, a rotary head type electronic component mounting apparatus is widely used. The electronic component supply device of the rotary head type electronic component mounting device is configured by mounting a table on which a feeder such as a tape feeder or a tube feeder is arranged on a moving table. A predetermined feeder is stopped at the pickup position of the nozzle of the transfer head by moving the feeder at a high speed in the lateral direction by a feeding means such as a nut or a linear motor.

[0003]

Since the above table is extremely heavy and reciprocates at a high speed, an extremely large load is applied to the motor, and the driver of the motor may fail during a long operation. Abnormalities such as loosening of the drive shaft of the motor occur. When such an abnormality occurs, the accuracy of the stop position of the table is disturbed, and troubles such as frequent occurrence of electronic component pick-up mistakes by the transfer head occur.

[0004] Abnormal operation also occurs in the rotary head. That is, if the assembling screws are loosened or the balance of the center of gravity is disturbed while the rotary head is driven and rotated by the motor, abnormal vibration occurs in the rotary head, causing a problem such as a decrease in stop position accuracy.

Conventionally, when such a trouble has occurred, maintenance and inspection of the apparatus have been performed.
If a trouble actually occurs and is not noticeable, it is not known that the trouble has occurred, and therefore, there has been a problem that the troubled device causes the device to continue erroneously operating. Furthermore, there is a problem that it takes a lot of trouble and time to find the cause and the location of the trouble.

Accordingly, an object of the present invention is to provide means capable of easily detecting a trouble of the device and preventing a malfunction of the device due to the trouble. More specifically, attention is paid to the fact that an abnormality in a device such as a table or a rotary head appears as an abnormality in an operation state of a motor driving the device, and a means for easily detecting an abnormality in the device while operating the device is provided. The purpose is to do.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a detection signal of an operating state is applied to a motor, characteristics of a feedback signal fed back from the motor are registered in advance, and the detection signal is applied during operation of the apparatus. Apply to the above motor,
The characteristic of the feedback signal fed back from the motor is compared with the characteristic of the feedback signal registered in advance.

[0008]

In the above configuration, during the operation of the apparatus, a motor detection signal is applied, and the characteristic of the feedback signal fed back from the motor is compared with the characteristic of the feedback signal registered in advance to determine the abnormality of the apparatus. Detect presence / absence. Also, in this case, if the characteristics of the feedback signal are registered in advance for typical troubles that are likely to occur, the cause of the trouble and the location of the trouble can be easily specified.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a rotary head type electronic component mounting apparatus. A rotary head 1 includes a plurality of transfer heads 2 along a circumferential direction. 3 is a nozzle for sucking electronic components, 10 is a rotary head 1
Is a motor for rotating. An electronic component supply device 4 is provided on the back surface of the rotary head 1. Reference numeral 5 denotes a moving table on which a table 6 is placed. A large number of feeders 7 for electronic components P such as a tape feeder and a tube feeder are arranged on the table 6. The table 6 moves laterally along a feed screw 8 provided on the moving table 5. Reference numeral 9 denotes a servomotor for driving the feed screw 8. Reference numeral 11 denotes an XY table provided on the front side of the rotary head 1, and reference numeral 12 denotes a substrate positioned on the XY table 11.

When the motor 9 is driven, the table 6 moves in the horizontal direction, and the feeder 7 equipped with a desired electronic component P is provided.
At the pickup position Q of the nozzle 3. Further, by rotating the rotary head 1 by an index, the electronic component P sucked and picked up by the nozzle 3 is transferred and mounted on the substrate 12.

FIG. 2 is a block diagram of the control means. The control means includes an integration processor 21, a deviation counter 22,
/ A converter 23, position counter 24, sine wave shaker 2
Consists of five. The speed command signal a is input to the integration processor 21. The integration processor 21 outputs a table position command signal I by integrating the speed command signal a. The current position information of the table 6 is fed back to the position counter 24 from the encoder 27 of the motor 9. The deviation counter 22 has the command signal I
And the deviation value IB of the output signal B of the position counter 24.
Is entered. The output of the deviation counter 22 is D / A
The D / A conversion is performed by the converter 23 and input to the driver 26, and the motor 9 is controlled by the driver 26. The vibrator 25 replaces the command signal I of the integration processor 21 with
A sine wave signal is output as the detection signal A of the operation state of the motor 9.

The present apparatus has the above-described configuration, and the operation will be described next. Normally, the motor 9 is controlled by the speed command signal a, and the table 6 is reciprocated along the feed screw 8 to supply electronic components to the transfer head 2.

As described above, the table 6 is reciprocated and the normal operation is performed, and the table 6 is appropriately or periodically made.
An inspection for the presence or absence of an abnormality in the device is performed as follows.

The output of the position signal I from the integration processor 21 is stopped, the detection signal A is applied from the vibrator 25 to the motor 9, and the motor 9 is driven. The operation state of the motor 9 is fed back from the encoder 27 to the position counter 24 as a feedback signal K, and the motor 9 is controlled by the deviation AB of the signal A and the output signal B of the position counter 24.

FIG. 3 is a frequency characteristic diagram when the motor 9 is driven in this manner. In the figure, a characteristic A shown by a solid line indicates a gain G (dB) in a normal state.
A characteristic B shown by a broken line indicates a gain G (dB) when the driver 26 is malfunctioning, and a characteristic C shown by a dashed line indicates a gain G (dB) when the driving shaft of the motor 9 is loose. The gain G (dB) is represented by equation (1) in FIG. In the formula, A is a sin wave exciter 2
The output value of 5, B is a feedback value from the position counter 24.

Therefore, the characteristics A, B, and C are registered in a computer in advance. And during operation of the device,
Alternatively, the detection signal A is periodically applied to the motor 9,
The operation status of the motor 9 is inspected. In this inspection, if a feedback signal similar to the characteristic A is obtained, the device is determined to be normal. Alternatively, if a feedback signal similar to the characteristic B is obtained, it is determined that the driver 26 is malfunctioning. Alternatively, if a feedback signal similar to the characteristic C is obtained, it is determined that the drive shaft of the motor 9 is loose. Also, in the drawing, if the inspection result indicated by C ′ is obtained, it is clear that the drive shaft is loosened in the initial stage. Therefore, if the maintenance is performed immediately, troubles due to loosening can be prevented.

Malfunction of the driver 26 and looseness of the drive shaft are typical examples of the failure of the electronic component supply device 4. Other failures can be detected by the same means as described above. Further, the failure of the rotary head 1 can be detected by the same means as described above. Typical failures of the rotary head 1 include looseness of a drive shaft of a motor 10 for intermittently rotating the rotary head 1 and abnormal vibration due to imbalance in the center of gravity of the rotary head 1.

According to the experimental results of the inventor, FIG.
As shown in the figure, when the sine wave frequency is 10 HZ or less, the difference between the normal state and the abnormal state is unlikely to appear,
When it exceeds 10 HZ, it appears remarkably.

[0020]

As described above, according to the present invention, a detection signal of an operation state is applied to a motor, the characteristics of the detection signal fed back from the motor are registered in advance, and during operation of the apparatus, The detection signal is applied to the motor, and the characteristic of the detection signal fed back from the motor is compared with the characteristic registered in advance, so that abnormality of the device can be easily detected, and trouble occurs. It is also possible to specify the location, and it is possible to prevent the occurrence of a trouble.

[Brief description of the drawings]

FIG. 1 is a plan view of an electronic component mounting apparatus.

FIG. 2 is a block diagram of a control unit.

FIG. 3 is a frequency characteristic diagram

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary head 2 Transfer head 3 Nozzle 4 Electronic component supply apparatus 5 Moving table 6 Table 7 Feeder 8 Feeding means 9 Motor 10 Motor

Claims (1)

(57) [Claims] 1. A moving table, a table on which a plurality of electronic component feeders are arranged side by side, and moving the table horizontally on the moving table to pick up electronic components of a predetermined feeder by a transfer head. In an electronic component mounting apparatus including a feeding unit that stops at a position, a motor that drives the feeding unit, and a rotary head that is driven by the motor to rotate the transfer head, a detection signal of an operation state is supplied to the motor. When the voltage is applied, the characteristics of the feedback signal fed back from the motor are registered in advance, and during the operation of the device, the detection signal is applied to the motor, and the characteristics of the feedback signal fed back from the motor are set in advance. A method for detecting an abnormality in an electronic component mounting apparatus, comprising comparing characteristics of the registered feedback signal.