JPH0927698A - Work mounting device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work mounting device and a method, wherein a mounting head which mounts a work such as an electronic component on an object such as a printed board can be lessened in weight and moved at a high speed. SOLUTION: A first rotator 15 and a second rotator 16 are housed in the case 11 of a mounting head 10, and a screw shaft 12 is inserted into the center of them. A nozzle 33 is linked to the lower end of the screw shaft 12 to serve as a chuck. A magnet 21 and a stator 22 which rotate the first rotator 15 are provided. A clutch member 23 which disconnects the rotators 15 and 16 from each other or connects them together. When the rotators 15 and 16 are connected together by the clutch member 23, the screw shaft 12 moves vertically, and when the rotators 15 and 16 are disconnected from each other, the screw shaft 12 rotates. Therefore, the nozzle 33 can be moved vertically and rotated by a single set of the magnet 21 and the stator 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work mounting apparatus and a mounting method for automatically mounting a work such as an electronic component on an object such as a printed circuit board.

[0002]

2. Description of the Related Art An electronic component mounting apparatus for mounting an electronic component on a printed circuit board mounts an electronic component provided in an electronic component supply unit such as a tray as described in Japanese Patent Laid-Open No. 5-21997. The head nozzle is vacuum-adsorbed, picked up, and mounted on a printed circuit board positioned in the positioning portion.

The chuck of a workpiece such as a nozzle is generally connected to the lower end of a vertical shaft. By lowering and raising the nozzle integrally with the shaft, electronic parts can be picked up or landed on a printed circuit board. It is designed to be installed. In addition, it is necessary to correct the posture of the electronic component vacuum-adsorbed by the nozzle in the direction of rotation and then mount it on the printed circuit board.Therefore, the posture of the electronic component is corrected by rotating the nozzle about its axis. ing.

[0004]

The mounting head of the conventional electronic component mounting apparatus is provided with two motors, a motor for causing the nozzle to perform the descending / ascending operation and a motor for performing the rotating operation. It was being done. However, when two motors are provided, the weight of the mounting head becomes heavy. Therefore, it is difficult for the mounting head to move between the electronic component supply unit and the printed circuit board at a high speed, and there is a problem that work efficiency does not increase. there were. Such a problem is not limited to the electronic component mounting apparatus, but is a problem common to the workpiece mounting apparatus that automatically mounts a workpiece on an object.

Therefore, it is an object of the present invention to provide a work mounting apparatus and a mounting method capable of mounting a work while reducing the weight of the mounting head and moving it at a high speed.

[0006]

To this end, the present invention provides a work mounting apparatus for mounting a work provided on a work supply section on a target object by chucking and transferring the work with a chuck section of a mounting head. A screw shaft in which the mounting head is slidable in its longitudinal direction and rotatable about its axis;
There is a nut provided with the chuck portion connected to the screw shaft, and a nut screwed to the screw shaft, and a drive unit for rotating the nut shaft to slide the screw shaft in its longitudinal direction. A rotating body for rotating the screw shaft about its axis and a clutch means for connecting / disconnecting the rotational force of the motor to / from the rotating body are provided.

Further, the mounting head is moved above the work supply unit, and the drive unit is driven there to lower the screw shaft.
The work is chucked and picked up by the chuck part connected to the lower end of the screw shaft, and then the screw shaft is rotated by the power of the drive part through the clutch means to rotate the screw shaft about its axis. After correcting the posture of the workpiece in the rotating direction, the screw shaft is lowered and raised to mount the workpiece on the object.

[0008]

According to the above construction, since the sliding operation and the rotating operation of the screw shaft are performed by one driving unit, the weight of the mounting head can be reduced, and the mounting head can be moved at a high speed between the work supply unit and the object. Work can be mounted while moving.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of a work mounting apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are sectional views of a mounting head provided in the work mounting apparatus, and FIG. 4 is a control system of the work mounting apparatus. It is a block diagram of.

In FIG. 1, 1 is a printed circuit board,
It is clamped and positioned on the guide 2 as a positioning portion. A tray 3 as a work supply unit is provided with an electronic component 4 as a work. A mounting head 10 is slidably held on the X-axis rail 6 via a slider 5. Both ends of the X-axis rail 6 are slidably held by a Y-axis rail 8 via sliders 7. Therefore, the mounting head 10 is driven by a power unit (not shown) and horizontally moves in the X direction and the Y direction.
The mounting head 10 repeatedly moves between the tray 3 and the printed circuit board 1, and mounts the electronic component 4 provided on the tray 3 at a predetermined coordinate position on the printed circuit board 1. Reference numeral 9 denotes a camera for recognizing electronic components, which is provided on the side portion of the guide 2.

Next, the structure of the mounting head 10 will be described. 2 is a cross-sectional view when the screw shaft 12 slides in the vertical direction, and FIG. 3 is a cross-sectional view when the screw shaft 12 rotates about its axis. In FIG. 2, 11 is a case, and the screw shaft 12 is vertically inserted in the center thereof. A screw 13 and a spline 14 are formed on the screw shaft 12.

A first rotating body 15 and a second rotating body 16 are housed inside the case 11. First rotating body 15
Holds therein a nut 17 which is screwed into the screw 13, and the second rotating body 16 has therein the spline 1
It holds a guide body 18 that fits into the No. 4 connector. 19 is the first
It is a bearing that holds the rotating body 15 and the second rotating body 16.

A magnet 21 is mounted on the outer peripheral surface of the first rotating body 15. A stator 22 facing the magnet 21 is mounted on the inner surface of the case 11.
The first rotating body 15, the magnet 21, and the stator 22 constitute a pulse motor, and when the stator 22 is energized, the first rotating body 15 rotates by θ about its axis. Then, the nut 17 integrated with the first rotating body 15 also rotates in the same direction. Since the nut 17 is screwed into the screw 13 of the screw shaft 12, when the nut 17 rotates, the screw shaft 1
2 slides in its longitudinal direction (vertical direction). At this time,
The guide body 18 fitted to the spline 14 guides the vertical movement of the screw shaft 12.

A tubular clutch member 23 is fitted around the outer periphery of the second rotating body 16. The clutch member 23 is elastically urged upward by a coil spring 24. Reference numeral 25 denotes a pusher, which is attached to an arm 26 (see also FIG. 1) provided outside the case 11. As shown in FIG. 1, a rod 28 of a cylinder 27 is connected to the arm 26. FIG. 2 shows a state in which the rod 28 of the cylinder 27 projects downward. In this state, the pusher 25 lands on the flange portion 23a of the clutch member 23 and pushes down the clutch member 23 against the spring force of the coil spring 24, and the upper surface of the clutch member 23 is the upper surface of the first rotating body 15. It is far from the bottom surface. Therefore, even if the first rotating body 15 rotates as described above, the rotation is not transmitted to the second rotating body 16. Further, as shown in FIG. 2, the pressing element 25 is pressed against the flange portion 23a of the clutch member 23, thereby providing a detent for preventing the clutch member 23 from rotating unnecessarily.

FIG. 3 shows a state in which the rod 28 of the cylinder 27 rises and the pusher 25 also rises and is separated from the flange portion 23a of the clutch member 23. In this state, the clutch member 23 is pushed up by the spring force of the coil spring 24, and the upper surface thereof is strongly pressed against the lower surface of the first rotating body 15. When the first rotating body 15 rotates in this state, the rotation is transmitted to the second rotating body 16 via the clutch member 23. Then, since the guide body 18 that rotates integrally with the second rotating body 16 is fitted into the spline 14, the screw shaft 12 rotates by θ around the axis thereof.
In this case, when the first rotating body 15 rotates, the nut 1
7 also rotates, but at this time, the screw shaft 12 rotates in the same direction as the nut 17 with the rotation of the guide body 18, so there is no difference in rotation between the nut 17 and the screw 13, and therefore the screw shaft 12 must move up and down. No θ rotation.

In FIG. 2, a code plate 30 is mounted on the upper surface of the first rotating body 15. Further, a sensor 31 for detecting the amount of rotation for reading the scale of the code plate 30 is provided on the upper surface of the case 11. This code plate 30 and sensor 3
The rotational position and the height of the screw shaft 12 are detected by detecting the rotational position of the first rotating body 15 with 1. Further, a nozzle 33 as a chuck portion is connected to the lower end portion of the screw shaft 12 via a block 32. The nozzle 33 is connected to a vacuum device (not shown) via a tube 34, and the electronic component 4 is vacuum-sucked to the lower end portion of the nozzle 33.

Next, the control system will be described with reference to FIG. 3
Reference numeral 1 is a sensor for detecting the rotation amount, 20 is a pulse motor including the magnet 21 and the stator 22, 27 is a cylinder, and 9 is a camera. The sensor 31 is connected to a control unit 44 such as a CPU via an A / D converter 41, a first current position counter 42, and a second current position counter 43. The first current position counter 42 detects the position of the screw shaft 12 in the height direction (Z direction). Also the second
The current position counter 43 detects the position in the same rotation direction (θ direction).

The pulse motor 20 is connected to the control section 44 via a drive circuit 45. The cylinder 27 is connected to the control unit 44 via a drive circuit 46. The camera 9 is also connected to the control unit 44 via a recognition circuit 47. The first current position counter 42 is
The signal is counted when the rod 28 of 7 protrudes and the connection state of the first rotating body 15 and the second rotating body 16 is released. The second current position counter 43 counts a signal when the rod 28 of the cylinder 27 is retracted and the first rotary body 15 and the second rotary body 16 are connected via the clutch member 23.

The work mounting device has the above-mentioned structure, and the overall operation will be described below. In FIG.
The mounting head 10 moves above the tray 3, and the screw shaft 12 moves down and up there to pick up the electronic component 4 by vacuum suction on the lower end of the nozzle 33. At this time, the mounting head 10 is in the state shown in FIG. That is, the clutch member 23 is pushed downward and the connection state between the first rotating body 15 and the second rotating body 16 is released, and by energizing the stator 22 in this state, the nut 17 is rotated and screwed. The shaft 12 moves down and up, and the nozzle 33 picks up the electronic component 4.

In FIG. 1, next, the mounting head 10 moves to above the camera 9 and observes the electronic component 4 vacuum-sucked at the lower end of the nozzle 33. Then, based on the image obtained by the camera 9, the positional deviation of the electronic component 4 in the rotation direction is calculated by the control unit 44.

Next, the mounting head 10 moves above the printed circuit board 1. In the middle of the movement, the screw shaft 12 is rotated by θ about its axis to correct the positional deviation of the electronic component 4 in the rotational direction. . At this time, the mounting head 10 is shown in FIG.
This is the state shown in FIG. That is, the pusher 25 retreats upward, the clutch member 23 is pushed up by the spring force of the coil spring 24, and the first rotating body 15 and the second rotating body 16 are in a connected state. Then, when the stator 22 is energized, the second rotating body 16 rotates integrally with the first rotating body 15, and the screw shaft 12 rotates by θ around the axis of the first rotating body 15 to rotate the electronic component 4 in the rotational direction. Is corrected.

Next, the mounting head 10 moves above the printed board 1, where the screw shaft 12 descends to land the electronic component 4 at the lower end of the nozzle 33 on the printed board 1 and then release the vacuum suction state. By raising the nozzle 33, the electronic component 4 is mounted on the printed board 1, and a series of operations is completed. Of course, in this case, the mounting head 10 is in the state shown in FIG. By repeating the above operation, the electronic components 4 of the tray 3 are mounted on the printed circuit board 1 one after another. When the mounting of all electronic components 4 is completed, the printed board 1 is sent to the next step.

The present invention is not limited to the above-described embodiment. For example, the work may be something other than an electronic component, and the chuck part may be a nozzle for sucking the work in vacuum, or the work may be attracted by a magnetic force. Alternatively, a mechanical chuck may be used, and the motor may be a motor other than the pulse motor.

[0024]

According to the present invention, since the sliding operation and the rotating operation of the screw shaft to which the chuck portion is connected are performed by one driving portion, the weight of the mounting head can be reduced and the mounting head can be operated at high speed. Work can be mounted while moving between the work supply unit and the object.

[Brief description of drawings]

FIG. 1 is a perspective view of a work mounting device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a mounting head provided in a workpiece mounting apparatus according to an embodiment of the present invention.

FIG. 3 is a sectional view of a mounting head provided in a workpiece mounting apparatus according to an embodiment of the present invention.

FIG. 4 is a block diagram of a control system of a work mounting device according to an embodiment of the present invention.

[Explanation of symbols]

 1 Printed Circuit Board (Target) 3 Tray (Work Supply Unit) 4 Electronic Component (Work) 10 Mounting Head 12 Screw Shaft 13 Screw 14 Spline 15 First Rotating Body 16 Second Rotating Body 17 Nut 18 Guide Body 20 Pulse Motor (Drive part) 21 Magnet 22 Stator 23 Clutch member (clutch means) 24 Coil spring 25 Pusher 27 Cylinder

Claims (2)

[Claims] 1. A work mounting device for chucking a work provided in a work supply unit by a chuck unit of a mounting head and transferring the work to mount it on an object, wherein the mounting head is slidable in a longitudinal direction thereof. And a screw shaft that is rotatable about its axis and a chuck portion that is connected to this screw shaft, and that is screwed to this screw shaft and this screw shaft is rotated by rotating this nut. A driving unit for sliding in the longitudinal direction, further comprising a rotating body for rotating the screw shaft about its axis, and clutch means for connecting and disconnecting the rotating force of the driving unit to the rotating body. Characteristic work mounting device. 2. A mounting head is moved above a work supply part, where a drive part is driven to lower and raise a screw shaft, and a work is chucked by a chuck part connected to a lower end part of the screw shaft. By picking up and then rotating the screw shaft about its axis by the power of the drive unit via the clutch means to correct the posture of the workpiece in the rotational direction, and then descending and raising the screw shaft. A method of mounting a work, wherein the work is mounted on the object.