JPH0521997A - Electronic-part moving and mounting head - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent damage to the nozzle and electronic components that occur when the nozzle collides with electronic components on the board and nearby devices. A transfer head A having a nozzle shaft 1 having a nozzle 2 for adsorbing an electronic component P at a lower end thereof, and an elevating means 31 for elevating the nozzle shaft 1,
A raising device 28 for retracting the nozzle shaft 1 to the raised position when an abnormality occurs is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer head for electronic parts. When an abnormality occurs, the nozzle shaft is forcibly retracted to a raised position by a lifting device so that the nozzle shaft is lowered by its own weight and the nozzle is moved to the substrate This is to prevent damage to the nozzle and electronic parts caused by collision with the above electronic parts and nearby devices.

[0002]

2. Description of the Related Art As an electronic component mounting apparatus, there is known an electronic component mounting apparatus which transfers and mounts an electronic component of a parts feeder on a substrate while moving a transfer head in an XY direction by an XY table. This transfer head is composed of a nozzle shaft, a nozzle for adsorbing an electronic component mounted on the lower end of the nozzle shaft, and an elevating means for elevating the nozzle shaft. After raising and lowering the shaft and picking up the electronic components of the parts feeder with the nozzles, the transfer head is moved onto the substrate by driving the XY table, and then the nozzles are raised and lowered again to mount the electronic components on the substrate. It is supposed to do.

[0003]

By the way, as the above-mentioned raising / lowering means, generally, for example, JP-A-62-111496 is used.
A cam type, a cylinder type, a ball screw type and the like shown in Japanese Patent Publication are known. In the case of this cam type, the motor rotates the cam to move the nozzle shaft up and down.However, if the motor drive stops when an abnormality occurs such as during a power failure or motor failure, the nozzle shaft moves down due to its own weight. I will end up. With the nozzle lowered like this, XY
When the table is driven and the nozzle moves on the substrate, there is a problem that the nozzle collides with electronic components on the substrate and nearby devices and damages these nozzles and electronic components. Such troubles are likely to occur similarly in the case of the cylinder type or ball screw type lifting means.

Therefore, the present invention provides a transfer head for an electronic component which can prevent the nozzle from descending when an abnormality occurs and colliding with the electronic component on the substrate or devices in the vicinity thereof. To aim.

[0005]

To this end, according to the present invention, an abnormality occurs in a transfer head having a nozzle shaft having a nozzle for adsorbing an electronic component at a lower end thereof and an elevating means for elevating the nozzle shaft. At the same time, a lifting device for retracting the nozzle shaft to the lifting position is provided.

[0006]

According to the above construction, when the raising / lowering means stops driving when an abnormality occurs, the raising device is driven to forcibly retract the nozzle shaft to the raised position, thereby preventing the nozzle shaft from lowering due to its own weight. However, this can prevent the nozzle from colliding with the electronic components on the substrate and the devices in the vicinity.

[0007]

(Embodiment 1) Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of a transfer head A for electronic parts according to the present invention. Reference numeral 1 denotes a nozzle shaft, and a nozzle 2 is attached to the lower end portion thereof. A chuck claw 3 is provided on the side of the nozzle 2. This chuck claw 3
Rotates around the pin 3a to open and close. This nozzle 2
Is picked up by picking up the chip P of the parts feeder 20 by being moved up and down by being driven by an elevating means (described later), and then the transfer head A is moved above the substrate S by driving an XY table (not shown). The chip P is mounted on the substrate S by moving the nozzle 2 up and down again.

Reference numeral 5 is a first cam. A cam follower 6 is in contact with the first cam 5. Reference numeral 7 is a first lever to which a cam follower 6 is attached, and swings around a pin 8 attached to a bracket 30. A roller 9 is attached to the tip of the lever 7, and the roller 9 is a guide ring 10 provided on the upper end of the nozzle shaft 1.
Is fitted to. Reference numeral 11 is a coil spring for pressing the cam follower 6 against the cam surface of the cam 5, and reference numeral 12 is a servo motor. When the motor 12 is driven and the cam 5 rotates, the lever 7 swings up and down around the pin 8, and the nozzle shaft 1 moves up and down in conjunction with this. That is, these components 5 to 12 constitute an elevating means for elevating the nozzle shaft 1.

Reference numeral 4 is a second cam provided coaxially with the first cam 5, and reference numeral 13 is a cam follower which comes into contact with the second cam 4. 14 is the second with the cam follower 13 pivotally attached.
Is a lever, and swings around the pin 15. Reference numeral 16 is a third lever provided below the second lever 14 and swings around a pin 17. 18 is a support block. Both levers 14 and 16 are connected by a rod 19. 19a and 19b are connecting pins.

A roller 21 is provided at the tip of the third lever 16.
The roller 21 has a rod-shaped hook 2
It is fitted in a guide ring 23 provided at the upper end of the No. 2. When the cam 4 is rotated by the driving of the motor 12, the lever 16 swings up and down around the pin 17, the chuck 3 opens and closes, and the chip P attracted to the lower end of the nozzle 2 is held.
Chuck and correct the positional deviation.

Reference numeral 24 is a pulley mounted on the nozzle shaft 1, 25 is a timing belt, 26 is a pulley, and 27 is a motor. When the motor 27 is driven, the pulley 24 rotates, and the nozzle shaft 1 also rotates about its axis, thereby setting the rotation angle of the electronic component P sucked by the nozzle 2 or shifting the position in the rotation direction. to correct. Two
Reference numeral 8 denotes a cylinder as a lifting device that lifts the nozzle shaft 1 when an abnormality occurs, and is provided above the nozzle shaft 1. When the motor 12 stops driving due to an abnormality such as a power failure or a motor failure, the rod 29 of the cylinder 28 projects as shown by the chain line in the figure to push up the lever 7, and the roller 9 and the guide ring 10 are used. The nozzle shaft 1 is raised.

FIG. 2 is a block diagram of the control means of the cylinder 28. In the figure, 32 is a CPU such as a computer, and 3
3 is a driver such as an IC circuit, and 34 is an encoder for the motor 12. The CPU 32 controls the drive of the motor 12 at all times. When the encoder 34 detects that the driving of the motor 12 is stopped when an abnormality occurs, the detection signal is sent to the CPU 32. Then, the CPU 32 issues a drive release command to the cylinder 28, and the rod 29 protrudes to retract the nozzle shaft 1 to the raised position as described with reference to FIG.

The present apparatus has the above-mentioned structure, and its operation will be described below. As shown by the solid line in FIG. 1, the rod 29 of the cylinder 28 is always retracted. In this state, the transfer head A moves directly above the parts feeder 20, where the motor 12 drives and the cam 5 rotates,
The nozzle shaft 1 moves up and down, and the electronic component P is adsorbed and picked up by the lower end of the nozzle 2. Next, the transfer head A uses the substrate S to mount the electronic component P on the substrate S.
While moving toward, the chuck claws 3 are closed by the rotation of the cam 4 and the electronic component P is chucked by the rotation of the cam 4 to correct the positional deviation. Then, when the transfer head A moves above the substrate S, the cam 5 rotates and the nozzle 2 moves up and down again, so that the electronic component P whose positional deviation has been corrected is mounted on the substrate S.

When an abnormality such as a power failure or a motor failure occurs and the motor 12 stops driving, the nozzle shaft 1 descends due to its own weight and the spring force of the coil spring 11 which attempts to rotate the lever 7 downward. I'll try, but C
A drive release command is issued from the PU 32 to the cylinder 28, the rod 29 thereof rises, pushes up the nozzle shaft 1 and retracts it to the raised position, and forcibly prevents the nozzle 2 from descending. Therefore, it is possible to prevent the above-mentioned trouble from occurring due to the nozzle 2 descending when an abnormality occurs.

(Second Embodiment) In FIG. 3, reference numeral 35 is a coil spring, which is housed in a cylinder 36 and has a rod 37.
Is biased upward. 38 is a supply pipe of the air E,
It is connected to the top of the cylinder 36. Air E is press-fitted from the supply pipe 38 at all times, and the bottom plate 39 of the rod 37 is pushed downward by the air pressure, so that the rod 37
Are drawn into the cylinder 36, and normal operation is performed in this state. When an abnormality occurs, the supply of the air E is stopped, the rod 37 projects due to the urging force of the coil spring 35, pushes up the lever 7, and retracts the nozzle shaft 1 to the raised position.

Other configurations and operations are similar to those of the first embodiment, and will not be repeated. The present invention is not limited to the above embodiments, and for example, the raising / lowering means of the nozzle shaft can be applied to other types such as cylinder type and ball screw type.

Further, in the above embodiment, when an abnormality occurs, the CP
Although the cylinder 28 is controlled based on the command from U32, the cylinder 28 may be controlled, for example, by a worker who has found this abnormality occurrence pressing an emergency button.

[0019]

As described above, according to the present invention, a nozzle shaft having a nozzle for adsorbing an electronic component at a lower end thereof,
An elevating device for elevating and lowering the nozzle shaft is provided, and an elevating device for retracting the nozzle shaft to an elevating position when an abnormality occurs is provided to form a transfer head for electronic parts. By retracting the nozzle shaft to the raised position, it is possible to prevent damage to the nozzle and electronic components due to the weight of the nozzle shaft being lowered by its own weight.

[Brief description of drawings]

FIG. 1 is a front view of a transfer head for an electronic component according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a control unit of a transfer head for electronic components according to a first embodiment of the present invention.

FIG. 3 is an enlarged view of a main part of a transfer head for electronic components according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle shaft 2 Nozzle 28 Lifting device 31 Lifting means P Electronic component S Substrate

Claims (1)

Claim: What is claimed is: 1. A nozzle shaft having a nozzle for adsorbing an electronic component at a lower end thereof, and an elevating means for elevating the nozzle shaft. The nozzle shaft is retracted to an ascending position when an abnormality occurs. A transfer head for electronic parts, which is provided with a lifting device.