JPH08330836A - Rotary body stoppage mechanism - Google Patents

Abstract

PURPOSE: To highly precisely stop a rotary body at a prescribed position by converting the rotary motion of a rotary solenoid into a straight-line motion and using the engagement of a contact pin and the notch part of a cam disk. CONSTITUTION: When the command signal of rotary stoppage is inputted to the rotary solenoid 5, the cam disk 1 stops as follows. When the rotary solenoid 5 becomes an off-state, a guide pin 9 slightly moves to a left direction. Then, the contact pin 6 slightly moves to the left direction by the pin 9. Thus, the contact pin 6 is brought into contact with the peripheral part of the cam disk 1 and it continues rotation for a while. Then, the pin 6 drops into the notch part 1A. A lower end part 9A release the contactor 10A of a microswitch 10 by the movement of a sliding plate 9 in the left direction, and the microswitch 10 is turned off. Then, an antenna rotary plate is precisely stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stop mechanism for detecting a stop position of a rotating body with high accuracy and stopping it at a predetermined stop position, and particularly, for stopping rotation of a radar antenna or the like at a predetermined stop position with high accuracy. The present invention relates to a rotating body stopping mechanism that is suitable.

[0002]

2. Description of the Related Art Conventionally, a device shown in FIG. 4 is known as this type of device. That is, a cut portion 1A is formed at one position on the circumference of the cam disk 1 to which a radar antenna or the like (not shown) is fixed.

A limit switch main body 2 arranged near the outer circumference of the cam disk 1 is provided with a plunger 2A.
Iron piece 4A pivotally supported on a part of the limit switch body 2
A roller 3 that engages with the cut portion 1A is rotatably provided at the tip of the leaf spring 4 having a.

While the antenna is rotating, the plunger 3A attracts the iron piece 4A of the leaf spring 4 so that the roller 3 is not in contact with the cam disc 1.

When a signal for stopping the rotation of the cam disk 1 is input from the outside, the plunger 2A is released and the cam disk 1 and the roller 3 continue to rotate while contacting each other.
When the roller 3 falls to the cut portion 1A of the cam disc 1, the leaf spring 4 is disengaged from the limit switch body 2, the "cut" signal is transmitted to the outside, and the rotation of the cam disc 1 is stopped.

[0006]

In the conventional apparatus as described above, since the leaf spring 4 is used for the plunger 2A, the leaf spring itself is deformed due to aging over a long period of time. Further, there is an inconvenience that elasticity of the leaf spring is deteriorated and the stop position of the cam disc (that is, the stop angle position of the antenna) is displaced.

Further, since the limit switch has a special shape, it is a custom-made product, which is disadvantageous in reducing the manufacturing cost.

An object of the present invention is to solve the above problems of the conventional device.

[0009]

In order to achieve the above object, the present invention provides a cam disc fixed to a rotating body in a stop mechanism for stopping the rotating body at a predetermined stop position.
A notch part provided on a part of the circumference of the cam disc, a contact pin arranged on the outer peripheral part of the cam disc for engaging with the notch part, and for driving the rotating body. An electric drive source, a microswitch for switching disconnection of electric power supply to the electric drive source, an engagement between the cutout portion and the contact pin is cut off during rotation of the rotating body, and An urging means for continuing the power supply to the electric drive source, and when the operation of the urging means is stopped, the engagement between the cut portion and the contact pin is achieved and the microswitch is It is characterized in that it is cut off and the rotating body stops at a predetermined position.

[0010]

According to the present invention, the rotary motion of the rotary solenoid is converted into a linear motion to utilize the engagement between the contact pin and the notch of the cam disk, so that the rotary body can be stopped at a predetermined position with high accuracy. It becomes possible.

In addition, mass-produced products can be used for the micro switch, and therefore, not only the price can be reduced, but also a highly accurate rotating body stopping mechanism which is not deteriorated with time even if used for a long time is provided. obtain.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will now be described with reference to FIGS.
Will be described in detail with reference to.

1 to 3, the same or equivalent members as those described in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 shows a state in which the rotation of a cam disk 1 which is attached with an antenna (not shown) and is rotatably supported by a bearing B is stopped.

In this state, when a signal for starting the rotation of the cam disc 1 is given to the rotary solenoid 5, the rotary solenoid 5 is slightly rotated clockwise in the drawing, and is fixed to the rotary solenoid 5. The guide pin 7 slightly moves to the right, and the slide plate 9 slightly moves to the right in the drawing.

The slide plate 9 is slidably attached to a bearing 13 provided on a fixed base 8 fixed to a receiving base 12.

The contact pin 6 is slightly moved to the right by such a rightward movement of the slide plate 9, so that the contact pin 6 is detached from the notch 1A of the cam disc 1 as shown in FIG. At this time, since the lower end 9A of the slide plate 9 presses the contact 10A of the micro switch 10, the micro switch 10 is turned on, and accordingly, a drive motor (not shown) for rotating the antenna is energized, The cam disc 1 starts rotating at a predetermined rotation speed.

When a rotation stop command signal is input to the rotary solenoid 5 while the cam disk is rotating as shown in FIG. 3, the respective members operate in the reverse order to that described above.
This causes the cam disc 1 to stop as follows.

That is, when the rotary solenoid 5 is turned off, the guide pin 9 slightly moves to the left,
As a result, the contact pin 6 moves slightly to the left, so that the contact pin 6 comes into contact with the circumferential portion of the cam disk 1 and continues to rotate for a while, but eventually falls into the notch portion 1A.

In this way, the microswitch 10 continues to be in the ON state until the contact pin 6 falls into the cut portion 1A. By the leftward movement of the slide plate 9, the lower end 9A releases the contact 10A of the micro switch 10 as shown in FIG. 1, whereby the micro switch 10 is turned off, and the antenna rotary plate is accurately stopped. Can be done.

[0021]

As described above, according to the present invention, the rotary motion of the rotary solenoid is converted into the linear motion and the engagement between the contact pin and the notch of the cam disk is utilized. Stopping at can be achieved with high precision. In addition, since a mass-produced product can be used for the micro switch, it is possible to provide a rotary body stop mechanism that can achieve a low price and that does not change with time even after long-term use and that has high accuracy.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an exemplary embodiment of the present invention and showing a schematic configuration when a rotating body is stopped.

2 is a cross-sectional view showing a schematic cross-section along the line AA in the embodiment of FIG.

FIG. 3 is a schematic plan view showing a schematic configuration during rotation of the rotating body in the embodiment.

FIG. 4 is a schematic plan view showing a conventional rotating body stopping mechanism.

[Explanation of symbols]

 1 cam disk 1A notch 2 limit switch body 3 roller 4 leaf spring 5 rotary solenoid 6 contact pin 7 guide pin 8 fixing base 9 slide plate 10 micro switch 10A contactor 11 micro switch mounting base 12 receiving base 13 bearing

Claims (2)

[Claims] 1. A stop mechanism for stopping a rotating body at a predetermined stop position, a cam disc fixed to the rotating body, a notch formed in a part of a circumference of the cam disc, A contact pin arranged on the outer peripheral portion of the cam disk for engaging with the cut portion, an electric drive source for driving the rotating body, and switching between disconnection of electric power supply to the electric drive source. A micro switch, and a biasing means for interrupting the engagement between the cutout portion and the contact pin during the rotating operation of the rotating body, and for continuing the power supply to the electric drive source, When the operation of the biasing means is stopped, the engagement between the cutout portion and the contact pin is achieved, the micro switch is cut off, and the rotating body is stopped at a predetermined position. mechanism. 2. The rotary plate according to claim 1, wherein the urging means is driven by a rotary solenoid and the rotary solenoid so that the contact pin is brought into contact with or separated from the notch. A rotating body stopping mechanism comprising: