JPS6286618A - Driving apparatus of electrically driven spring operation type switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an operating mechanism for an electric spring-operated switch, and more particularly to a drive device for operating a switch using a spring stored in an electric motor.

[Background of the invention]

Generally, in the drive mechanism of an electric spring operated switch, as shown in FIG. 2, a closing device 2 having a closing spring 1 is connected to a link mechanism 3.
It is connected to the blocking section 4 via the link mechanism 3.
An exception device 6 with a cut-off spring 5 is connected to.

Reference numeral 7 indicates an electric motor, and a crank 9 having a pin 8 at an eccentric position is fixed to the shaft of the electric motor 7.

This crank 9 is connected to a lever 11, \, by a pin 12 via a link 1o. This lever 11
is a bushing 1 with a cylindrical outer periphery inserted into a square shaft 13.
4 is rotatably fitted into the lever 11.
A first pawl 15 is attached to the side surface of the housing by means of a pin 16. A lever 17 is rotatably fitted into the bushing 14, and a second pawl 18 is attached to the side surface of the lever 17.
is attached by pin 19.

A gear 20 is attached to the square shaft 13, and this gear 2o
Teeth 20A that engage the first pawl 15 and the second pawl 18 are formed on the outer periphery of the tooth.

When the electric motor 7 is rotated by a command by these devices, the first pawl 15 rotates the teeth 20A of the gear 20 one tooth at a time, and the second pawl 18 prevents reverse rotation when the tooth 20A of the gear 20 is advanced one tooth at a time.

Now, when the spring has finished storing its energy and is now held by the hook 26 that holds its release force, the rotation of the electric motor 7 is stopped by the limit switch 25, but due to the excess rotational force of the electric motor, The first pawl 15 attempts to rotate the gear 20 until the dyeing is completely stopped. Therefore, a part 20B of the outer periphery of the gear is provided with a toothless portion so that the first pawl 15 does not move the gear 20 even if the electric motor 7 rotates even in the fully charged state. In this portion, the first pawl 15 only makes reciprocating motion until the electric motor 7 stops.

Now, in the above mechanism, when the closing spring 1 and the shutoff spring 5 are increased in order to increase the opening/closing ability, it is also necessary to increase the capacity of the electric motor 7 required for storing spring energy. However, an increase in the capacity of the electric motor must be avoided because it would require an increase in the overall structure and also cause an increase in price. Attach the attached third claw 15A.

By feeding the gear 20 half a tooth at a time, it is possible to reduce the eccentricity of the electric motor 7 by half, double the torque, and increase the spring force. This structure is shown in FIG.

However, in this structure, the gear 20 has teeth in order to prevent excessive rotation of the gear 20 at the end of the spring energy storage.

Note that this type of device is disclosed in, for example, Japanese Patent Laid-Open No. 58-5924.

[Purpose of the invention]

The purpose of the present invention is to solve the above-mentioned drawbacks by providing a mechanism for preventing excessive rotation of the pawl 15A provided for increasing the spring force at the end of the spring energy accumulation, and as a matter of course, during the normal spring energy accumulation process. An object of the present invention is to provide a drive device that is intended to cause no trouble.

[Summary of the invention]

The present invention rotates a gear by a pawl driven by an electric motor, has a spring stored in force by the gear, and operates a switch by releasing the stored force in the spring. In the device, the gear pawl has a driving pawl and a reversal prevention pawl, and the driving pawl is composed of a plurality of pawls that alternately feed the gear tooth by tooth. In order to prevent the pawls from trying to further advance the gear with the surplus rotational force of the electric motor when the spring is finished, a toothless part is made on the gear. It is characterized by the aim of ensuring that it does not occur, and is designed to achieve its purpose.

[Embodiments of the invention]

FIG. 1(A) shows an embodiment of a switch drive device according to the present invention. The structure of this embodiment is the same as that of the second example shown as a conventional example.
Since the structure is almost the same as that shown in the figure, only its features will be explained below.

A first pawl 15 and a third pawl 15A are attached to the lever 11. 15 and 15A are provided at positions shifted by half a tooth with respect to the teeth of the gear 20. This is to double the torque by halving the eccentricity of the crank 9 connected to the shaft of the motor 7 without increasing the capacity of the SQ motor. The gear 20 is sent to. When the spring energy storage ends, the limit switch operates and the electric motor 7
The rotation of the first pawl 15 and the third pawl are stopped due to the surplus rotational force.
In order to prevent the pawl 15A from rotating further, as shown in Fig. 1 (
The gears 20 in B) are each provided with a toothless portion 20B. However, it becomes impossible for the first pawl 15 to pass through the toothless portion 20B provided for the third pawl 15A during the spring accumulating process, and the spring accumulating stops (idling) at that point. Therefore, the third pawl 15A is provided with a tooth notch as shown in FIG. It was decided to provide a toothless part on the chisel (20C).

In other words, when the third pawl 15A passes through a toothless part for the first pawl 15 in the process of storing spring energy, it meshes with the toothed part and enables the rotation of the gear, but when the spring storage ends. At this point, the first pawl 15 engages the toothless area 20G, and the third pawl 15A engages the toothless area 20B, thereby preventing excessive rotation of the gear 20.

〔Effect of the invention〕

According to the present invention, it is possible to double the torque of the electric motor by providing a plurality of pawls for gear rotation and meshing them alternately with the gear, and furthermore, when the spring energy storage ends, Excessive rotation can be prevented and the gears and pawls can be stopped without being subjected to excessive force.

As described above, it is possible to provide a switch drive device that can increase the spring force without increasing the capacity of the electric motor.

[Brief explanation of drawings]

FIG. 1(A) is a perspective view showing an embodiment of the drive device according to the present invention, FIG. 1(B) is a detailed perspective view showing the gears and pawls of the present invention, and FIG. 2 is a conventional drive. FIG. 3, a perspective view of the device, shows an example of a conventional NJJ device in which a plurality of claws are provided. 1... Closing spring, 2... Closing device, 3... Link mechanism. 4... Cutoff part, 5... Cutoff spring, 6... 51 external device, 7... Electric motor, 8... Bin, 9... Crank, 10... Link, 11... Lever, 12...pin, 13...square shaft. 14... Bush, 15, 15A, 18... Nail, 1
7... Lever, 20... Gear, 25... Limit switch. 26...Hook.

Claims (1)

[Claims] 1. A switch that rotates a gear by a pawl driven by a driving machine, has a spring that stores energy by this gear, and operates the switch by releasing the stored force of this spring. In the drive device, the gear pawl has a driving pawl and a reverse rotation prevention pawl, and the driving pawl is composed of a plurality of pawls that alternately feed the gear tooth by tooth. In order to prevent the pawls from trying to further advance the gear with the surplus rotational force of the electric motor when the spring is finished, a toothless part is made on the gear, but it is necessary to make sure that the above-mentioned multiple pawls are the same at the end of the spring energy storage. A drive device for an electric spring-operated switch, characterized in that the gear does not feed.