JPH06209192A - Electronic component mounting equipment - Google Patents

Abstract

PURPOSE:To provide an electronic component mounting equipment wherein a turret which rotates and intermittently moves is made capable of more high speed driving to improve productivity, and reliability is ensured without deteriorating endurance of an index unit and a worm reducer. CONSTITUTION:A worm reducer 4 is connected with the rotary shaft of a driving motor 1 via a coupling 3. An index unit 6 which converts continuous rotation to intermittent rotation and outputs it is connected with the reduction speed output shaft of the worm reducer. A turret 8 equipped with a means which sucks an electronic component and mounts it on a circuit board or the like is connected with the output shaft of the index unit 6. A type of the index unit 6 which stops and stays a plurality of times for one input rotation and rotates is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component mounting apparatus for adsorbing and mounting electronic components on a substrate or the like, and more particularly, for intermittently rotating the electronic components to adsorb and transfer the electronic components and mounting them on a predetermined position on a circuit board. To improve the structure of the drive system.

[0002]

2. Description of the Related Art For example, an electronic component mounting apparatus for mounting an electronic component such as a semiconductor chip supplied from a supply unit on an electronic circuit board is used.

Specifically, a turret (also referred to as an index table) is provided with a plurality of suction nozzles communicating with a vacuum source at equal intervals on the same radius. This turret is equipped with a mechanism that drives the suction nozzle up and down.
It is also connected to an index unit that is driven to rotate intermittently. A drive system for driving the turret through an index unit is conventionally configured as shown in FIG. 2 or 3.

First, referring to FIG. 2, a
Is a turret and is connected to the output shaft b1 of the index unit b. A pulley c is fitted on an input shaft b2 of the index unit b, and a timing belt e is laid around the pulley c fitted on an output shaft d1 of the worm speed reducer d so as to run endlessly. The worm reducer d is directly connected to the drive motor f.

In this case, the drive rotation of the drive motor f is reduced by the worm speed reducer d, and this reduced rotation is transmitted to the index unit b via the timing belt e. The index unit b drives the turret a for intermittent rotation, and the suction nozzle provided in the turret a moves down while it is stopped to suck electronic components and move up. With the turret a rotated by a predetermined angle, the suction nozzle sucking the electronic component descends and is mounted on the circuit board. (Note that the suction nozzle, electronic components, and circuit board are not shown. The same applies hereinafter.)

In FIG. 3, a drive pulley g1 is fitted to the rotary shaft of a drive motor f, and an input shaft h1 of a worm speed reducer h is used.
The drive belt i is stretched between the driven pulley g2 and the driven pulley g2. The worm reducer h is directly connected to the index unit j, and the index unit j
The turret k and the turret k are connected to each other via gears m and n fitted to the respective support shafts.

Therefore, the drive motor f is driven by the drive belt i.
The rotational force is transmitted to the index unit j via the worm gear reducer h, and the index unit j drives the turret k intermittently by the meshing of the cams m and n.

[0008]

In either drive system, the rotational drive force of the drive motor f is finally transmitted to the turrets a and k, and the necessary intermittent rotation state drive is performed. There are problems as described in.

That is, according to the drive system of FIG. 2, the high torque output from the worm speed reducer d is transferred to the timing belt e.
Since the rotational force is transmitted to the index unit b to drive the index unit b, the timing belt e suffers from backlash and extension when rotationally driven at high speed, resulting in uneven rotation. This uneven rotation is naturally caused by the index unit b.
Will be adversely affected and this will lead to a decrease in durability and accuracy.

According to the drive system shown in FIG. 3, since the gears m and n are interposed between the index unit j and the turret k, the gears m and n are rotated at a high speed.
There was a problem that the stopping accuracy was not improved due to the backlash.

Recently, there is a tendency to increase the rotational speeds of the turrets a and k in order to further improve the productivity, and for that reason, a high-speed rotational driving force is input to the worm speed reducers d and h. I have to

However, there is no general worm speed reducer d or h used at present with a minimum speed reduction ratio of 1/5 or less. And, these worm reducers d and h have 1
It is structurally impossible to input a rotation of 800 rpm or more, and the maximum rotation speed is the same. After all, the rotation of 360 rpm or more could not be supplied to the index units a and k.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to drive a turret that intermittently moves in rotation at a higher speed, thereby improving productivity and obtaining an index unit. Another object of the present invention is to provide an electronic component mounting apparatus having a drive system that ensures reliability without impairing the durability of the worm reducer.

[0014]

In order to achieve the above object, the present invention provides a drive motor, a speed reducer connected to a rotary shaft of the drive motor via a coupling, and a speed reduction output of the speed reducer. An index unit connected to the shaft for converting continuous rotation into intermittent rotation and outputting the rotation, and a turret connected to the output shaft of the index unit for adsorbing an electronic component and mounting the electronic component on a circuit board or the like are provided. The above-mentioned index unit is an electronic component mounting apparatus characterized in that it uses a type that stays and rotates a plurality of times for one input rotation.

[0015]

According to the present invention, since the index unit is stopped and rotated a plurality of times for one rotation of the input, the intermittent rotation speed of the turret is basically doubled.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In the figure, reference numeral 1 is a drive motor. A coupling 3 is provided on a rotary shaft 2 of the drive motor 1 and is connected to an input shaft 5 of a worm speed reducer 4. As the coupling 3, a non-backlash type is adopted. Therefore, no backlash occurs in the input to the worm speed reducer 4 and the output from the worm speed reducer 4.

The worm speed reducer 4 is directly connected to the index unit 6 of the multiple stay type. here,
We will use the one that stops twice. That is, the index unit 6 outputs two revolutions intermittently with respect to one revolution input. The index unit used conventionally is a one-time stationary type, and outputs one intermittent rotation per input of one rotation.

A main output shaft 7 is projectingly provided on the lower surface side of the index unit 6 and a turret 8 is connected thereto. Although not shown here, for example, a plurality of mounting portions are provided at the peripheral end of the turret 8 with a predetermined angle. A rotary portion provided with a plurality of suction nozzles radially is provided in these mounting portions.

An auxiliary output shaft 9 is provided on the side surface of the index unit 6, and a drive mechanism 10 for driving the suction nozzle is connected to the auxiliary output shaft 9.
That is, at the end of the auxiliary output shaft 9, a pair of pulleys 11,
12 is fitted and connected to a pair of cam shafts 13 and 14 provided in parallel with each other via timing belts 15 and 16.

A pair of cams 17a and 17b provided on one cam shaft 13 are rocking levers 18a and 18b, respectively.
Up and down one end of. Each swing lever 18a, 18b
The other end of the device drives the pressing rod 19, which is a device, up and down. The pressing rod 19 presses the suction nozzle in a predetermined rotary portion downward to project it from the holder, and causes the electronic component to perform a suction operation. A plurality of cams 20 provided on the other cam shaft 14 ...
Has a function of correcting the position of, for example, a suction nozzle that sucks an electronic component in another rotary portion.

Thus, the rotational driving force of the drive motor 1 is transmitted to the worm speed reducer 4 via the coupling 3. At this time, since the coupling 3 is provided, the rotational force is transmitted in a non-backlash manner as described above.

The worm speed reducer 4 decelerates to a set speed and outputs it to the index unit 6. Since the index unit 6 is of the double-stop type,
Intermittent rotation output is performed twice for one input rotation. That is, one rotation of the input that is normally used causes one intermittent rotation,
Compared with the one-time stop type, twice the number of intermittent rotations can be obtained.

When the rotation speed of the drive motor 1 and the reduction gear ratio of the worm speed reducer 4 are used as they are without change, the index unit 6 is a two-time stay type, and therefore the turret 8 has twice the intermittent rotation speed. Is obtained.

However, if the number of intermittent rotations is doubled at once, it becomes difficult to secure the reliability and safety of the work using the suction nozzle. Therefore, in actual work, deceleration of the worm reducer 4 is performed. It is conceivable to change the ratio to a small value and increase the turret 8 intermittently by a fractional number. In any case, smooth high-speed intermittent rotation without backlash can be obtained, and high productivity can be achieved while ensuring high accuracy and long life.

At the same time, the auxiliary output shaft 9 drives the cam shafts 13 and 14 at double speed via the timing belts 15 and 16. Therefore, the drive mechanism 10, which is the rotary portion drive system, operates at a double speed, and coincides with the intermittent rotation operation of the turret 8 to smoothly perform the operation described above.

The drive mechanism 10 outputs the output of the index unit 6 to the camshafts 13 and 1 having two rotary drive systems.
4 and drives the device 19 by a pair of levers 18
Since it is driven by a and 18b in the shortest time and directly, weight reduction and high rigidity can be achieved. Because there is no so-called rattling factor,
Vibration can be reduced and high speed driving becomes possible.

[0028]

As described above, according to the present invention, the speed reducer is connected to the rotary shaft of the drive motor via the coupling, the index unit is connected to the speed reducer, and the index unit and the turret are connected. However, since the index unit is of a type that retains and rotates a plurality of times with respect to one rotation of the input, the turret that intermittently rotates can be driven at a higher speed to improve the productivity. The effect is that the drive system ensures reliability without impairing the durability of the index unit and the worm speed reducer.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a drive system of an electronic component mounting apparatus showing an embodiment of the present invention.

FIG. 2 is a perspective view of a drive system main part of an electronic component mounting apparatus showing a conventional example of the present invention.

FIG. 3 is a perspective view of a main part of a drive system of an electronic component mounting apparatus, showing a still another conventional example.

[Explanation of symbols]

1 ... Drive motor, 3 ... Coupling, 4 ... Reduction gear (worm reduction gear), 6 ... Index unit, 8 ... Turret.

Claims (1)

[Claims] 1. A drive motor, a speed reducer connected to a rotary shaft of the drive motor via a coupling, and continuous rotation input connected to a speed reduction output shaft of the speed reducer is converted into intermittent rotation and output. The index unit and a turret that is connected to the output shaft of the index unit and has means for adsorbing an electronic component and mounting the electronic component on a circuit board or the like. An electronic component mounting device characterized by using a rotating type.