JPS62219107A - Positioning device - Google Patents

Abstract

PURPOSE:To improve a positioning accuracy by being composed of a motor, a Geneva mechanism driven by the motor, a sliding brush fitted at the wheel of the Geneva mechanism and an SW pattern where the sliding brush slides on it by the rotation of the wheel. CONSTITUTION:By changing over a changing-over SW 12 to a K side, a worm wheel 14 is rotated in a Y direction, and accompanying it, by the function of a Geneva mechanism, a wheel 16 and an output shaft 7 are rotated by 1/4 in the X direction for one rotation of the worm wheel 14. When a brush 6 is shifted to H by the rotation of the wheel 16, the conduction between SW patterns 10a and 10c is eliminated, and therefore, a motor 1 is stopped, at such a time, rotated until a pin 15 comes off from the wheel 16 by the inertia rotation of the motor 1, and by a stopper 17, the wheel 16 and an output shaft 7 are fixed at a constant position. At such a time, the pin 15 can dislocate the wheel 16 only by the inertia of the motor, and for such a reason, the stopper 17 fixes the wheel 16 without fail. Thus, even when the quantity of the inertia rotation of the motor is changed, a highly accurate positioning can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary positioning device that uses a motor to perform rotational drive and stops at a fixed position.

(Prior Art) In recent years, positioning devices using motors have been used in industrial applications, and particularly recently, they have been used to control automobile suspension dampers.

An example of a conventional positioning device will be described below with reference to the drawings.

Figure 3 shows a conventional positioning device.
is a motor, 2 is a worm fixed to the shaft of motor 1, and 3 is a worm fixed to the shaft of motor 1.
is a worm wheel driven by worm 2. 4 is a spur gear A fixed to the worm wheel 3; 5 is a spur gear B driven by the spur gear A;
A brush 6 is attached to the lower surface of the spur gear B5. Reference numeral 7 denotes an output shaft, which is fixed to the spur gear B5, and is used for positioning with respect to the outside.

FIG. 4 shows a cross section of the conventional positioning device shown in FIG. , 8 is a substrate, on which a switch pattern (hereinafter referred to as SW), which will be described later, is formed, and the brush 6 slides on this SW pattern.

9 is a chassis, which holds each of the above-mentioned parts.

FIG. 5 shows the SW on the board 8 in the state shown in FIG. 1 or 2.
It shows the pattern and the position of the brush 6. Brush 6
The sliders 6a, 6b, 6c slide on the SW patterns 10a, 10b, 10c, respectively.

FIG. 6 shows the electric circuit of the positioning device, and the portion 11 surrounded by a dashed line is the S shown in FIG.
This is a pattern SW composed of a W pattern and a brush 6. 12 is a switching SW.

The operation of the positioning device configured as above will be explained below.

First, when switching switch S W12 in FIG. 6 is switched to the side.

Since the SW patterns 10a and 10c are electrically connected through the sliders 6a and 6c of the brush 6 in FIG. 5, the pattern 5W11 in FIG. 6 is turned on, and the motor 1 rotates. The motor 1 has a worm 2. Worm wheel 3. Spur gear A4
The spur gear B5 is rotated in the direction of arrow X in FIG. When the brush 6 moves to FIG. 5H due to the rotation of the spur gear B5, the motor 1 stops because there is no electrical continuity between the SW patterns 10a and 10c. At this time, the brush 6 actually stops at D, which is the target stop position, due to the inertial rotation of the motor 1, and thereby the output shaft 7 is positioned at a desired position.

Furthermore, if the switch 5W12 is switched to the L side, the SW patterns 10a and 10b are electrically connected by the sliders 6a and 6b of the brush 6, and as a result, the brush 6 stops at E, which is 90'' advanced from D. .

By these operations, the output shaft 7 is positioned every 90 degrees every time the switching 5W12 is switched.

(Problem to be solved by the invention) However, in the case of the above-mentioned five-layer structure, the electric power of the motor 1,
Because the amount of inertia rotation of the motor 1 fluctuates due to fluctuations in the power source voltage or fluctuations in external torque applied to the output shaft 7, the brush 6 may not stop at D or E but before this point. , and the output shaft 7 may be stopped beyond this point, resulting in a problem that the positioning accuracy of the output shaft 7 is low. In order to improve positioning accuracy, it may be possible to increase the gear reduction ratio or provide a brake to the motor, but this would result in a larger size and higher cost.

In view of the above problems, the present invention provides a positioning device with high positioning accuracy.

(Means for Solving the Problems) In order to solve the above problems, the positioning device of the present invention includes a motor, a Geneva mechanism driven by the motor, and a sliding mechanism attached to a wheel of the Geneva mechanism. A brush and a sliding brush that slides on it due to the rotation of the wheel.
It consists of a W pattern.

(Function) According to the above configuration, the motor rotates or stops by the switching operation of the switch constituted by the SW pattern and the sliding brush, and the position of the output shaft provided on the wheel is determined. In this case, even if the inertial rotation of the motor fluctuates, the stepping operation of the Geneva mechanism prevents the rotation from being transmitted to the wheels of the Geneva mechanism, allowing highly accurate positioning.

(Example) Examples will be described below with reference to the drawings.

FIG. 1 is a plan view of a positioning device according to an embodiment of the present invention, and FIG. 2 is a front view thereof. In FIGS. 1 and 2, the same members as in the conventional example are given the same numbers, and detailed explanations are omitted.

14 is a worm wheel having a pin 15 as a driver of the Geneva mechanism, and 16 is a wheel of the Geneva mechanism driven by the pin 15. A brush 6 is attached to the wheel 16. Reference numeral 17 denotes a stopper of the Geneva mechanism, which is fixed to the worm wheel 14 or provided integrally therewith, and functions to fix the wheel 16 in a fixed position every time the wheel 16 is operated intermittently. Other members have the same configuration as the conventional example.

The operation of the positioning device configured as above will be explained below.

First, as in the conventional example, the worm wheel 14 is rotated in the direction of the arrow Y in FIG. 1 by switching the switch 5W12 in FIG. 6 to the side. Along with this, due to the action of the Geneva mechanism, the wheel 16 is rotated for each rotation of the worm wheel 14.
And the output shaft 7 rotates 1/4 in the direction of arrow X. When the brush 6 moves to FIG. 5H due to the rotation of the wheel 16,
Since electrical continuity between SW patterns 10a and 10c is lost, motor 1 stops. At this time, the inertial rotation of the motor 1 causes the pin 15 to rotate until it comes off the wheel 16.
The wheel 16 and the output shaft 7 are fixed in position by the stopper 17. At this time, as a feature of the Geneva mechanism, near the end of the intermittent movement, the worm wheel 14 and pin 15
The torque applied to the stopper 17 is very small and is hardly affected by the magnitude of the torque applied to the wheel 16 or the output shaft 7. Therefore, the pin 15 can disengage the wheel 16 only by the inertia of the motor. This will ensure that the wheel 16 is fixed.

As described above, according to this embodiment, the motor 1.

A worm wheel with a bottle 14 as a driver of the Geneva mechanism driven by the motor 1, a wheel 16 driven by a pin 15, a brush 6 attached to the wheel 16, and the brush 6 moving over it by the rotation of the wheel 16. Sliding SW pattern 10a.

10b and 10c, SW patterns 10a and 10
b.

The motor 1 is rotated and stopped by the switching operation of the SW constituted by the brush 10c and the brush 6. 7 can be positioned accurately every 90@.

(Effects of the Invention) As explained above, according to the present invention, even if the amount of inertia rotation of the motor fluctuates, the influence is not transmitted to the wheel having the output shaft, making it possible to perform highly accurate positioning. Moreover, it has the advantage that it does not become bulky or cause an increase in cost.

[Brief explanation of drawings]

1 is a plan view of a positioning device according to an embodiment of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a plan view of a conventional positioning device, and FIG. 4 is a sectional view of the same, and FIG. FIG. 5 is a diagram showing the relationship between the pattern switch pattern and the brush, and FIG. 6 is an electric circuit diagram of the pattern switch. 1...Motor, 2...Worm, 6...Brush. 7... Output shaft, 10a, 10b, 10cm
5W pattern, 11... pattern SW, 14.
... Worm wheel, 15... Pin, 16...
Wheel, 17...stopper. Patent applicant Matsushita Electric Industrial Co., Ltd.';-i';::+ Fig. 1 17, - Sto Noper Fig. 2 Fig. 3 Fig. 4 Fig. 5 =-SWlshio -°/

Claims (1)

[Claims] a motor, a driver of the Geneva mechanism driven by the motor, a wheel of the Geneva mechanism driven by the driver, a sliding brush attached to the wheel, and the sliding brush moves over it by rotation of the wheel. The motor is comprised of a sliding switch pattern, and the motor is rotated or stopped by the switching operation of the switch comprised of the switch pattern and the sliding brush, and the position of the output shaft provided on the wheel is determined. positioning device.