JPH04100127A - Rotational angle controller - Google Patents

Abstract

PURPOSE:To eliminate a need of expensive switches as rotation stop switches by providing rotation stop switches above rotation control switches in the cam rotating direction and constituting rotation stop switches of switches which are operated by the action of the pressing force in the peripheral direction of a cam on a shaft to be damped. CONSTITUTION:If an operation defect occurs in a clockwise limit switch 11 and a counterclockwise limit switch 12 as rotation control switches, a rotation spindle 2 to be damped is stopped by rotation stop switches 13 and 14. In this case, the spindle 2 to be damped is turned clockwise, and the pressing force in the peripheral direction of a cam 4 acts on the rotation stop switch 13, and the spindle 2 to be driven is turned counterclockwise, and the pressing force in the peripheral direction of the cam 4 acts on the rotation stop switch 14. Thus, expensive switches like limit switches are unnecessary as rotation stop switches.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotation angle control device suitable for implementation in, for example, an antenna device.

[Conventional technology]

Conventionally, this type of rotation angle control device is shown in Figs. 6(a) and F.
It is configured as shown in b). To explain this based on the figure, in the figure, the reference numeral 1 is an input shaft that rotates by the drive of a motor (not shown), and the reference numeral 2 is a braked shaft connected to the input shaft 1 via a reducer 3. , 4 is a cam fixed to this braked shaft 2, and 5 and 6 are a clockwise limit switch and a counterclockwise limit switch as rotation control switches operated by the radial pressing force generated by the rotation of this cam 4. It is. Note that these switches 5.6 are positioned at positions that limit the co-movement direction of the brake shaft 2.

In the rotation angle control device configured in this way, when the input shaft 1 is rotated by a motor (not shown), the braked shaft 3 rotates in the same direction as the input shaft 1; When the clockwise limit switch 5 or the counterclockwise limit switch 6 is operated by pressing the cam 4 on the cam 3,
The braked shaft 3 stops.

[Problem to be solved by the invention]

By the way, in this type of rotation angle control device, since the rotation angle of the braked shaft 3 is controlled by the clockwise direction limit switch 5 and the counterclockwise direction limit switch 6, the operation of both these switches 5 and 6 is required. When a defect occurs, the rotating brake shaft 3 cannot be stopped. As a result, an expensive switch such as a limit switch is required as a switch for stopping the rotation, resulting in an increase in cost.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a rotation angle control device that eliminates the need for an expensive switch as a rotation stop switch, thereby reducing costs. .

[Means to solve the problem]

The rotation angle control device according to the present invention is provided with a rotation stop switch at a position where the cam moves forward in the rotation direction from the rotation control switch, and this switch is connected in the circumferential direction of the cam on the shaft to be braked. It is composed of a switch that is operated by pressing force.

In addition, the rotation angle control device according to another aspect of the present invention fixes the cutting blade to the braked shaft, and also sets the cutting blade to a position where the rotation control switch advances in the cam rotation direction. This switch is configured by a switch that is operated by the circumferential cutting force of the cutting blade.

[For production]

In the present invention, when a malfunction occurs in the rotation control switch, the rotation stop switch is operated by the circumferential pressing force due to the pressure of the cam, and the rotating braked shaft can be stopped. .

In another aspect of the present invention, when a malfunction occurs in the rotation control switch, the rotation stop switch is activated by the cutting force in the circumferential direction of the cutting blade to stop the rotating braked shaft. It can be stopped.

(Example) Hereinafter, the structure of the present invention will be explained in detail by referring to an example shown in the drawings.

FIGS. 1(a) and 1(bl) are a plan view and a sectional view showing a rotation angle limiting device according to the present invention. In the following figures, the same members as in FIG. Explanation will be omitted.In the same figure, reference numerals 11 and 12 indicate a clockwise limit switch and a counterclockwise limit switch, which are rotation control switches that are operated by the radial pressing force generated by the rotation of the cam 4. A limit switch is provided at each rotation direction control position of the braked shaft 2. Reference numerals 13 and 14 are rotation stop switches operated by the circumferential pressing force generated by the rotation of the cam 4. , each having two contacts 13a1
3b, 14a and 14b, and cables 15 to 18 are connected to each of these contacts. Both these switches 1
One of the switches 13 of 3.14 is disposed at a position that advances in the cam rotation direction from the clockwise limit switch 11, and is configured such that the braked shaft 2 stops when the switch is opened. The other switch 14 is
It is disposed at a rotation angle restriction position that advances in the cam rotation direction from the reverse direction restriction switch 12, and is configured such that the braked shaft 2 stops when the switch is opened.

In the rotation angle control device configured as described above, when a malfunction occurs in the clockwise direction limit switch 11 and the counterclockwise direction limit switch 12 as switches for rotation control, each rotation stop switch 1314 stops the rotation. The braked shaft 2 inside can be stopped. In this case, the braked shaft 2
rotates clockwise and the circumferential pressing force of the cam 4 acts on the rotation stop switch 13, while the braked shaft 2 rotates counterclockwise and the circumferential pressing force of the cam 4 acts on the rotation stop switch 13. It acts on the switch 14 for stopping the movement.

Therefore, in this embodiment, an expensive switch such as a limit switch is not required as a switch for stopping rotation.

In this embodiment, the switch 13, 14 is operated by the pressing force in the circumferential direction due to the rotation of the cam 4, but the present invention is not limited to this.
Figures (δ), (b) and Figure 3 (a).

As shown in ('b), an arrangement in which the rotation stop switches 22 and 23 are operated by the pressing force in the circumferential direction due to the rotation of the auxiliary cam 21 produces the same effect as in the embodiment. In this case, one switch 22 is the first switch that the auxiliary cam 21 contacts.
It is made up of a spring contact 22a and a second spring contact 22b corresponding to this spring contact 22a, and is arranged at a rotation angle restriction position that advances in the cam rotation direction from the clockwise direction restriction switch 11. The other switch 23 consists of a first spring contact 23a with which the auxiliary cam 21 comes into contact, and a second spring contact 23b corresponding to this spring contact, and advances in the cam rotation direction from the counterclockwise direction limit switch 12. It is located at the rotation angle limit position.

Next, a rotation angle limiting device according to another aspect of the present invention will be described.

4(a) and 4(b) are a plan view and a sectional view showing a rotation angle control device according to another invention of the present invention, and FIG. 5 is a perspective view showing a cutting blade thereof. Reference numeral 31 indicates a cutting blade arranged below the cam 4 and fixed on the brake shaft 3.

Reference numerals 32 and 33 indicate rotation stop switches which are operated by the circumferential cutting force of the cutting blade 31, and are respectively connected to the clockwise limit switch 11 and the counterclockwise limit switch 1.
2 is located at a rotation angle limiting position that advances in the cam rotation direction. Both switches 32 and 33 are formed entirely of cables, and are configured so that when they are opened, the braked shaft 2 is stopped.

In the rotation angle control device configured in this way, even if a malfunction occurs in the clockwise direction limit switch 11 and the counterclockwise direction limit switch 12 as switches for rotation control, the rotation angle control device can be rotated in the same way as in the case of the present invention. The rotating brake shaft 2 can be stopped by the rotation stop switches 32 and 33, and an expensive switch such as a limit switch is not required as a rotation stop switch.

〔Effect of the invention〕

As explained above, according to the present invention, a rotation stop switch is provided at a position that advances in the cam rotation direction from the rotation control switch, and this switch notch is arranged around the cam on the braked shaft. Since it is constructed with a switch that is operated by directional pressing force, even if the rotation control switch malfunctions, the rotation stop switch can be operated by the circumferential pressing force of the second cam of the braked shaft. It is possible to stop the rotating shaft. Therefore, an expensive switch for stopping the rotation is not required, so that costs can be reduced. According to another aspect of the present invention, the cutting blade is fixed to the braked shaft, and a rotation stop switch is provided at a position that advances in the cam rotation direction from the rotation control switch, and this switch The switch is configured with a switch that is activated by the circumferential cutting force of the cutting blade, so even if the rotation control switch malfunctions, the rotation stop switch can be operated by the circumferential pressing horn of the cutting blade. The rotating shaft to be braked can be stopped by this. Therefore, since an expensive switch for stopping the rotation is not required, costs can be reduced.

[Brief explanation of drawings]

FIGS. 1(a) and (b) are a plan view and a sectional view showing one embodiment of the rotation angle control device according to the present invention, and FIGS. 2(a) and (b) are plan views showing another embodiment. 3 is an enlarged sectional view of part A in FIG. 2(b), and FIG. 4 is a sectional view (
a) and (bl) are a plan view and a sectional view showing a rotation angle control device according to another invention of the present invention, FIG. 5 is a perspective view showing its cutting blade, and FIG. 6 (a) and (0)l are FIG. 1 is a plan view and a sectional view showing a conventional rotation angle control device. 2: Braked shaft, 4: Cam, 11: Clockwise limit switch, 12: Counterclockwise limit switch, 13.14: Rotation stop switch. Agent Masu Oiwa IJ ■ Figure 1 Well 1) Nawate Suidute Figure 2

Claims (2)

[Claims] (1) In a rotation angle control device that operates a rotation control switch by a radial pressing force due to rotation of a cam on a braked shaft to control the rotation angle of the braked shaft, the cam is controlled by the switch. A rotating device characterized in that a switch for stopping the rotation is provided at a position advancing in the rotation direction, and the switch is constituted by a switch operated by the circumferential pressing force of a cam on the braked shaft. Corner restriction device. (2) In a rotation angle control device that operates a rotation control switch by a radial pressing force due to rotation of a cam on the braked shaft to control the rotation angle of the braked shaft, the braked shaft A cutting blade is fixed on the top, and a rotation stop switch is provided at a position advancing from the switch in the cam rotation direction, and this switch is operated by a switch operated by the circumferential cutting force of the cutting blade. A rotation angle control device characterized by comprising: