JP3159473B2 - Electronic component transfer head - Google Patents

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 components, and when an abnormality occurs, a nozzle shaft is forcibly retracted to a raised position by an ascending device, whereby the nozzle shaft is lowered by its own weight, and the nozzle is mounted on a substrate. This is to prevent damage to the nozzles and electronic components caused by colliding with the above electronic components and nearby devices.

[0002]

2. Description of the Related Art As an electronic component mounting apparatus, an electronic component mounting apparatus which transfers an electronic component of a parts feeder onto a substrate while moving a transfer head in an XY direction using an XY table is known. This transfer head is composed of a nozzle shaft, a nozzle attached to the lower end of the nozzle shaft for sucking an electronic component, and elevating means for elevating and lowering the nozzle shaft. The shaft is moved up and down, and the electronic components of the parts feeder are picked up by the nozzle and picked up. Then, the transfer head is moved onto the substrate by driving the XY table, and then the nozzle is moved up and down again to mount the electronic components on the substrate. It is supposed to.

[0003]

The above-mentioned elevating means is generally, for example, disclosed in JP-A-62-111496.
There are known a cam type, a cylinder type, a ball screw type, and the like shown in Japanese Patent Application Laid-Open No. H10-260, 1988. In the case of this cam type, the cam is rotated by the motor to move the nozzle shaft up and down. However, when the motor stops driving at the time of occurrence of an abnormality such as a power failure or motor failure, the nozzle shaft descends due to its own weight. I will. With the nozzle lowered in this manner, XY
When the table is driven and the nozzles move on the substrate, the nozzles collide with electronic components on the substrate and nearby devices, thereby causing a problem that these nozzles and electronic components are damaged. Such troubles are also likely to occur in the case of the cylinder type or ball screw type elevating means.

Accordingly, the present invention provides an electronic component transfer head capable of preventing the nozzle from descending when an abnormality occurs and causing the nozzle to collide with electronic components on the substrate or nearby devices. Aim.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a nozzle shaft having a nozzle for sucking an electronic component at a lower end, a motor for moving the nozzle shaft up and down, and a motor.
Control unit that controls the driving of the motor and detects the rotation of the motor
A detection device, and an elevating device for retracting the nozzle shaft to the elevating position , wherein the detection device detects that the driving of the motor is stopped.
When notified, the detection signal is sent to the control unit, and
The lifting device is driven by a command from the control unit to
The shaft is retracted to a raised position .

[0006]

According to the above configuration, the motor stops driving the lower subsidiary
When the detecting means detects that the nozzle shaft is driven by the command of the control unit and forcibly retracts the nozzle shaft to the ascending position, the nozzle shaft is prevented from descending by its own weight, whereby the nozzle is moved to the substrate. It is possible to prevent collision with the upper electronic components and nearby devices.

[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 an electronic component transfer head A according to the present invention. Reference numeral 1 denotes a nozzle shaft, on the lower end of which a nozzle 2 is mounted. A chuck claw 3 is provided beside the nozzle 2. This chuck claw 3
Rotates about the pin 3a and opens and closes. This nozzle 2
Is moved up and down by being driven by lifting / lowering means (described later), thereby picking up and picking up the chip P of the parts feeder 20, 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 denotes a first cam. A cam follower 6 is in contact with the first cam 5. Reference numeral 7 denotes a first lever on which the cam follower 6 is pivotally mounted, and swings around a pin 8 attached to the bracket 30. A roller 9 is pivotally mounted on the tip of the lever 7. The roller 9 is provided with a guide ring 10 provided at the upper end of the nozzle shaft 1.
Is fitted. 11 is a coil spring for pressing the cam follower 6 against the cam surface of the cam 5, and 12 is a servomotor. When the motor 12 is driven to rotate the cam 5, 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 denotes a second cam provided coaxially with the first cam 5, and reference numeral 13 denotes a cam follower abutting on the second cam 4. Reference numeral 14 denotes a second shaft on which the cam follower 13 is mounted.
And swings about the pin 15. Reference numeral 16 denotes a third lever provided below the second lever 14, which swings around a pin 17. Reference numeral 18 denotes a support block. The 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 is a rod-shaped hook 2
2 is fitted to a guide ring 23 provided at the upper end. When the cam 4 is rotated by the drive of the motor 12, the lever 16 swings up and down around the pin 17, the chuck 3 opens and closes, and the tip P sucked at the lower end of the nozzle 2
And corrects the positional deviation.

Reference numeral 24 denotes a pulley mounted on the nozzle shaft 1, 25 denotes a timing belt, 26 denotes a pulley, and 27 denotes 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 attracted to the nozzle 2 or displacing the rotational direction. to correct. 2
Reference numeral 8 denotes a cylinder as a lifting device that raises the nozzle shaft 1 when an abnormality occurs, and is provided above the nozzle shaft 1. When the motor 12 stops driving when an abnormality such as a power failure or a motor failure occurs, the rod 29 of the cylinder 28 protrudes as shown by a chain line in FIG. The nozzle shaft 1 is raised.

FIG. 2 is a block diagram of control means of the cylinder 28. In the figure, 32 is control such as computer of CPU
A control unit 33 is a driver such as an IC circuit, and 34 is an encoder as a detecting means for detecting the rotation of the motor 12. Normally, the CPU 32 controls the driving of the motor 12. When the encoder 34 detects that the drive of the motor 12 has stopped at the time of occurrence of the abnormality, the detection signal is sent to the CPU 3.
Sent to 2. Then, from the CPU 32 to the cylinder 28
As described with reference to FIG. 1, 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-described configuration, and the operation will be described next. As shown by the solid line in FIG. 1, the rod 29 of the cylinder 28 is normally retracted. In this state, the transfer head A moves right above the parts feeder 20, where the motor 12 is driven and the cam 5 is rotated.
The nozzle shaft 1 moves up and down to suck and pick up the electronic component P at the lower end of the nozzle 2. Next, the transfer head A mounts the electronic component P on the substrate S to mount the electronic component P on the substrate S.
During the movement, the chuck claw 3 closes due to the rotation of the cam 4 to chuck the electronic component P, thereby correcting the displacement. 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 displacement has been corrected is mounted on the substrate S.

When the motor 12 stops driving due to an abnormality such as a power failure or motor failure, the nozzle shaft 1 descends due to its own weight and the spring force of the coil spring 11 for rotating the lever 7 downward. To try, but C
When a drive release command is issued from the PU 32 to the cylinder 28, the rod 29 rises, pushes up the nozzle shaft 1 and retreats to the raised position, and forcibly prevents the nozzle 2 from descending. Therefore, it is possible to prevent the occurrence of the above-described trouble by lowering the nozzle 2 when an abnormality occurs.

(Embodiment 2) In FIG. 3, reference numeral 35 denotes a coil spring, which is housed in a cylinder 36 and has a rod 37
Is urged upward. 38 is a supply pipe of the air E,
It is connected to the upper part of the cylinder 36. Normally, the air E is press-fitted from the supply pipe 38, and the bottom plate 39 of the rod 37 is pushed downward by air pressure, so that the rod 37
Is 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, and the rod 37 projects by the urging force of the coil spring 35 to push up the lever 7 to retreat the nozzle shaft 1 to the raised position.

The other configuration and operation are the same as those of the first embodiment, and will not be described. The present invention is not limited to the above-described embodiment. For example, other types such as a cylinder type and a ball screw type can be applied to the lifting / lowering means of the nozzle shaft.

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

[0019]

According to the present invention as described above ,
When the drive of the motor that raises and lowers the sill shaft stops.
Is detected by the detecting means and
Since the lifting device is driven to automatically retract the nozzle shaft to the raised position, it is possible to prevent damage to the nozzles and electronic components due to lowering of the weight of the nozzle shaft.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Nozzle shaft 2 Nozzle 12 Motor 28 Elevating device 31 Elevating means 32 CPU 34 Encoder P Electronic component S Substrate

────────────────────────────────────────────────── (5) References JP-A-62-132399 (JP, A) JP-A-62-111496 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05K 13/04

Claims (1)

(57) [Claims] 1. A nozzle shaft having a nozzle for sucking an electronic component at a lower end portion, and moving up and down the nozzle shaft.
A motor, a control unit for controlling driving of the motor, and a motor
A detecting device for detecting rotation, and a lifting device for retracting the nozzle shaft to a raised position , wherein the detecting device includes a motor.
When the drive stop is detected, the detection signal
And the lifting device is driven by a command from the control unit.
To move the nozzle shaft to the raised position.
Electronic component transfer head, characterized in that the.