JP2993401B2 - Work mounting device and mounting method - Google Patents

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 work 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, for example, Japanese Patent Application Laid-Open No. 5-21997. The pickup is picked up by vacuum suction on a nozzle of the head, and is mounted on a printed circuit board positioned at a positioning portion.

A chuck portion of a work such as a nozzle is generally connected to a lower end portion of a vertical shaft. By lowering and raising the nozzle integrally with the shaft, electronic components are picked up or landed on a printed circuit board. To be attached. In addition, the electronic components vacuum-adsorbed to the nozzles must be mounted on the printed circuit board after correcting the attitude in the rotation direction. For this reason, the attitude of the electronic components is corrected by rotating the nozzle around its axis. ing.

[0004]

The mounting head of the conventional electronic component mounting apparatus is provided with two motors, one for causing the nozzle to perform a lowering / upward operation and the other for performing a rotating operation. Had been. However, when two motors are provided, the weight of the mounting head becomes heavy, so that 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 the work efficiency is not improved. there were. Such a problem is not limited to the electronic component mounting apparatus, but is a problem common to a work mounting apparatus for automatically mounting a work on an object.

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

[0006]

SUMMARY OF THE INVENTION To this end, the present invention provides a work mounting apparatus for chucking a workpiece provided in a workpiece supply unit by a chuck unit of a mounting head, transferring the workpiece, and mounting the workpiece on an object. 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 a chuck portion connected to the screw shaft and screwed to the screw shaft, and a drive portion for sliding the screw shaft in the longitudinal direction by rotating the nut, 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 motor to and from the rotating body are provided.

Further, the mounting head is moved above the work supply section, and the drive section is driven there to lower the screw shaft.
The workpiece is chucked and picked up by a chuck unit connected to the lower end of the screw shaft, and then the screw shaft is rotated about its axis by the power of the driving unit via clutch means. After correcting the posture of the work in the rotation direction, the work is mounted on the object by lowering and raising the screw shaft.

[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 between the work supply unit and the object at a high speed. The work can be mounted while moving the work.

[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 cross-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, reference numeral 1 denotes a printed circuit board,
It is positioned by being clamped on a guide 2 as a positioning portion. Reference numeral 3 denotes a tray as a work supply unit, which 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 on a Y-axis rail 8 via a slider 7. Therefore, the mounting head 10 is driven by a power unit (not shown) and horizontally moves in the X and Y directions.
The mounting head 10 repeatedly moves between the tray 3 and the printed board 1, and mounts the electronic component 4 provided on the tray 3 at a predetermined coordinate position on the printed board 1. Reference numeral 9 denotes a camera for electronic component recognition provided on the side of the guide 2.

Next, the structure of the mounting head 10 will be described. FIG. 2 is a cross-sectional view when the screw shaft 12 slides vertically, and FIG. 3 is a cross-sectional view when the screw shaft 12 rotates about its axis. In FIG. 2, reference numeral 11 denotes a case, into which a screw shaft 12 is vertically inserted. 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
Has a nut 17 screwed into the screw 13 therein, and the second rotating body 16 has a spline 1 therein.
4 is held by a guide body 18 fitted therein. 19 is the first
And a bearing for holding 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 rotor 15, the magnet 21, and the stator 22 constitute a pulse motor, and when the stator 22 is energized, the first rotor 15 rotates θ around 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 the longitudinal direction (vertical direction). At this time,
A 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 repelled upward by a coil spring 24. Reference numeral 25 denotes a pressing element, 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 where the rod 28 of the cylinder 27 protrudes downward. In this state, the presser 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. The upper surface of the clutch member 23 is Away from the bottom. 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 presser 25 is pressed against the flange portion 23a of the clutch member 23 to prevent the clutch member 23 from rotating unnecessarily.

FIG. 3 shows a state in which the rod 28 of the cylinder 27 is raised, and the presser 25 is also raised and 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 its upper surface 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 to the spline 14, the screw shaft 12 rotates θ around its axis.
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 that there is no rotation difference between the nut 17 and the screw 13, so that the screw shaft 12 moves up and down. And rotate θ.

In FIG. 2, a code plate 30 is mounted on the upper surface of the first rotating body 15. 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 the sensor 3
The rotation position and the height of the screw shaft 12 are detected by detecting the rotation position of the first rotating body 15 by 1. A nozzle 33 as a chuck portion is connected to a lower end 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 vacuum sucks the electronic component 4 at the lower end of the nozzle 33.

Next, the control system will be described with reference to FIG. 3
1 is a sensor for detecting the rotation amount, 20 is a pulse motor including the magnet 21 and the stator 22, etc., 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 a control unit 44 via a drive circuit 45. The cylinder 27 is connected to a control unit 44 via a drive circuit 46. The camera 9 is connected to the control unit 44 via a recognition circuit 47. Note that the first current position counter 42
The signal is counted when the seventh rod 28 projects and the connection state between the first rotating body 15 and the second rotating body 16 is released. Further, the second current position counter 43 counts a signal when the rod 28 of the cylinder 27 is retracted and the first rotating body 15 and the second rotating body 16 are connected via the clutch member 23.

The work mounting apparatus has the above-described configuration, and the overall operation will be described next. In FIG.
The mounting head 10 moves above the tray 3, where the screw shaft 12 moves down and up, whereby the electronic component 4 is vacuum-adsorbed and picked up at 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 down, and the connection state between the first rotating body 15 and the second rotating body 16 is released. In this state, when the stator 22 is energized, the nut 17 rotates to The shaft 12 performs a lowering / upward operation, and the nozzle 33 picks up the electronic component 4.

In FIG. 1, the mounting head 10 is then moved above the camera 9 and observes the electronic component 4 vacuum-adsorbed to the lower end of the nozzle 33. Then, based on the image obtained by the camera 9, the displacement 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. On the way, the screw shaft 12 is rotated .theta. Around its axis to correct the positional deviation of the electronic component 4 in the rotation direction. . At this time, the mounting head 10 is
This is the state shown in FIG. That is, the presser 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. When the stator 22 is energized, the second rotator 16 rotates integrally with the first rotator 15, and the screw shaft 12 rotates θ around its axis to rotate the electronic component 4 in the rotational direction. Is corrected.

Next, the mounting head 10 moves above the printed circuit 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 circuit board 1, and then releases the vacuum suction state. By raising the nozzle 33, the electronic component 4 is mounted on the printed circuit board 1, and a series of operations ends. 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 the electronic components 4 is completed, the printed circuit 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 other than electronic parts, and the chuck may be a magnet that sucks the work by a magnetic force in addition to a nozzle that sucks the work in vacuum. 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 moved at a high speed. Work mounting work can be performed while moving between the work supply unit and the object.

[Brief description of the drawings]

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

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

FIG. 3 is a sectional view of a mounting head provided in the work mounting apparatus according to one embodiment of the present invention;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board (target) 3 Tray (work supply part) 4 Electronic component (work) 10 Mounting head 12 Screw shaft 13 Screw 14 Spline 15 1st rotating body 16 2nd rotating body 17 Nut 18 Guide body 20 Pulse motor (Drive unit) 21 Magnet 22 Stator 23 Clutch member (clutch means) 24 Coil spring 25 Presser 27 Cylinder

Claims (2)

(57) [Claims] A work mounting apparatus for chucking and transferring a work provided in a work supply unit by a chuck unit of a mounting head and mounting the work on an object, wherein the mounting head is slidable in a longitudinal direction thereof. A screw shaft rotatable about the axis thereof; a chuck connected to the screw shaft; and a nut screwed to the screw shaft; and rotating the nut to rotate the screw shaft. There is a driving unit that slides in the longitudinal direction, and a rotating body that rotates the screw shaft around its axis is provided, and clutch means that connects and disconnects the rotating force of the driving unit to and from the rotating body is provided. Characteristic work mounting device. 2. The apparatus according to claim 1, wherein the mounting head is moved to a position above the work supply section, and the drive section is driven to lower and raise the screw shaft, and the work is chucked by the chuck section connected to the lower end of the screw shaft. By picking up, and then rotating the screw shaft about its axis by the power of the driving unit via clutch means to correct the posture of the work in the rotational direction, lowering and raising the screw shaft. A method for mounting a work, wherein the work is mounted on the object.