JPH0160696B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application of the Invention The present invention relates to a reverse rotation prevention device for mechanically restricting the rotation direction of an electric motor or the like capable of forward and reverse rotation to rotation in one direction.

2. Description of the Related Art Conventional reversal prevention devices include a ratchet mechanism (for example, shown in FIG. 4) having a pawl gear 8 and a pawl 9, and a mechanism without a pawl gear, such as an eccentric roller, an eccentric latch, a sliding wedge 10, and a spring clutch. It can be roughly divided into two types (for example, Figure 5). However, while the former operates reliably, it has the disadvantage that the pawl 9 is constantly in contact with the pawl gear 8 during normal rotation, making it noisy and is not suitable for high-speed rotation, while the latter is quiet during normal rotation. However, the drawback was that the operation was uncertain.

Problems to be Solved by the Invention The present invention solves the above-mentioned conventional drawbacks.
There is no noise when rotating in one direction, and operation is reliable when preventing reverse rotation, and in order to regulate the rotation direction of synchronous motors etc. that can rotate in forward and reverse directions, it has a large amount of reverse rotation so that the startability cannot be prevented. At the same time, it is an object of the present invention to provide a robust reversal prevention device that can withstand the impact when the reversal is prevented.

(2) Means for Solving the Constituent Problems of the Invention In order to solve the above-mentioned problems, the present invention first sets the arm and the locking protrusion apart to prevent the generation of noise when reverse rotation is not prevented. In the case of preventing reverse rotation, the arm is provided to ensure engagement with the locking protrusion. That is, at least one locking protrusion is provided on the rotating shaft, and the locking protrusion is movable between a position where the locking protrusion stops the rotation of the rotating shaft and a position where the rotating shaft is not in contact with the locking protrusion. an arm pivoted on one side, a spring clutch tightly wound so as to be able to slide freely on the rotating shaft; one end of the spring clutch is extended and bent through a loop; an arm rotatably engaged between the pivot shaft and the tip, and biased so that the arm is in a position away from the locking protrusion, and the rotary shaft rotates in one direction. At this time, the reverse rotation prevention device is provided so that the arm portion is biased in a direction in which the arm and the locking protrusion come into contact with each other.

When the rotary shaft rotates in one direction, the spring clutch rotates together with the rotary shaft, and the arm abuts on a locking protrusion provided on the rotary shaft to stop the rotation of the rotary shaft. When the rotating shaft rotates in the opposite direction, the spring clutch slides on the rotating shaft and does not rotate, and the arm is biased to maintain a separated position so that the arm does not come into contact with a protrusion provided on the rotating shaft. Ru. In this manner, reverse rotation can be reliably prevented by the positional relationship between the spring clutch, the arm, and the locking protrusion. Furthermore, the mechanical engagement between the spring clutch and the arm provides a reliable anti-reversal effect. In addition, since the arm of the spring clutch is bent through a ring, the swinging angle of the arm can be increased, and the engagement between the locking protrusion and the arm can be increased, making it mechanically strong. It is possible.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1, 2, and 3, reference numeral 1 indicates a rotating shaft of an electric motor, etc., and this rotating shaft 1 has at least one locking protrusion 2. Here, a plurality of locking protrusions 2 are shown. The gear 2a having the gear 2a is fixed.
Furthermore, a spring clutch 3 is provided on the rotating shaft 1, which is tightly wound around the rotating shaft 1 so as to rotate together when the rotating shaft 1 rotates counterclockwise, and slidably when the rotating shaft 1 rotates clockwise in the opposite direction. An arm portion 4 is extended from one end of the spring clutch 3, and an end portion 4a of the arm portion 4 is engaged with an arm to be described later. Rotating axis 1
An arm 6 is swingably supported on the outside of the rotary shaft 5 via a pivot shaft 5, and when the tip 6a of the arm 6 comes into contact with the locking protrusion 2 of the rotary shaft 1, the rotation of the rotary shaft is stopped. acts to stop. From this position, it is possible to swing between the positions where the two do not come into contact with each other.
A pin 7 is fixed on the arm 6, and is located between the pivot shaft 5 and the tip 6a of the arm, and the end 4a is pivoted to the pin 7 so as to apply rotational force to the arm 6. There is. 4b is the arm portion 4 of the spring clutch 3
A ring provided in the middle of the arm 4 through this ring 4b.
is bent and has elasticity. In this case, the arm 6 and the locking protrusion 2 are in positions separated from each other.

In this embodiment, when the rotating shaft 1 rotates counterclockwise, the spring clutch 3 wraps around the rotating shaft 1 and rotates with it, as shown in FIGS. 1 and 2, and the arm 4 is forced to pull down the arm 6. Forced. As a result, the tip 6a of the arm 6 comes into contact with the locking protrusion 2 of the gear 2a, and the rotation of the rotating shaft is restricted. On the other hand, when the rotating shaft 1 rotates clockwise, the spring clutch 3 slides on the rotating shaft 1, as shown in FIG.
The arm portion 4 is urged to push up the arm 6 due to the sliding resistance. Therefore, the tip 6 of the arm 6
a is held at a position where it does not come into contact with the locking protrusion 2 of the gear 2a. As described above, in this embodiment, when the reverse rotation is not prevented, the arm 6 and the locking protrusion 2 are separated from each other without sliding into contact with each other, so that low-noise rotation of the rotating shaft can be maintained. One or more locking protrusions may be provided on the rotating shaft, but if the gear 2a is used as shown in the figure, there will be a large number of locking protrusions 2, and locking to prevent reverse rotation can be performed quickly and reliably. It will be held in

(3) Effects of the Invention The reversal prevention device of the present invention can be used for high-speed rotation with less noise because the locking protrusion and the arm do not come into sliding contact when the rotating shaft rotates in one direction, and there is no frictional resistance. few. In addition, since the arm and the locking protrusion can be deeply engaged by the bent arm through the ring extending from the spring clutch, it is possible to reliably prevent reverse rotation and to withstand the impact and increase durability. There are effects such as being able to improve your skills.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a reverse rotation prevention device showing an embodiment of the present invention, FIGS. 2 and 3 are front views of the same device, and FIGS. 4 and 5 are front views showing a conventional example. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 2... Locking protrusion, 2a... Gear, 3... Spring clutch, 4... Arm of spring clutch, 4a... End, 4b... Ring, 6... Arm.

Claims (1)

[Scope of Claims] 1. At least one locking protrusion provided on the rotating shaft, and a locking protrusion that is swingable between a position where the locking protrusion stops rotation of the rotating shaft and a position where the rotating shaft does not come into contact with the locking protrusion. an arm pivotally supported on the outside of the rotating shaft; a spring clutch slidably and closely wound on the rotating shaft;
One end of the spring clutch is extended and bent through a ring so that the end is rotatably engaged between the pivot shaft and the tip of the arm, and the arm is connected to the locking protrusion. and an arm biased to be in a position away from the locking protrusion, so that when the rotating shaft rotates in one direction, the arm biases the arm in a direction in which the locking protrusion comes into contact with the arm. A reverse rotation prevention device characterized by being provided in. 2. The reverse rotation prevention device according to claim 1, which uses a gear having a plurality of locking protrusions as the locking protrusion.