JPH0736355Y2 - Stop lever operation mechanism by electromagnet - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field of the Invention The present invention relates to an operation in which an adsorption piece separates from an electromagnet.
The present invention relates to a lever mechanism in which a stop lever stops the operation of other members.

2. Description of the Related Art In order to stop the operation of an operating member, a locked portion is provided on the operating member, a stop lever provided with the locking portion is separated from the electromagnet, and the locked portion is locked by the locking portion. There is a mechanism. Then, in order to return from the state after locking to the state before locking, the return lever is provided with a return engaging portion, and the return engaging member is moved by the return member, so that the locking portion is locked. It returns to the position where it is not locked, and the suction piece is returned from the separated position to the suction position. In order to ensure the operation of returning the adsorption piece to the adsorption position, it is necessary to further press the adsorption piece against the electromagnet after the adsorption piece reaches the adsorption position (including an error).

Therefore, in the conventional stop lever, the lever itself is divided into two members, that is, a portion provided with a locking portion and a portion provided with a suction piece, and these two members are attached so as to rotate about one axis, and a spring is used. Connection is made by urging in one direction. With this configuration, when the attraction piece separates from the electromagnet, the attraction piece and the locking portion move integrally, and when the attraction piece moves to the attraction position by the return member, the attraction piece does not contact the electromagnet. And the engaging portion move integrally, and after the attraction piece contacts the electromagnet, the member including the attraction piece moves while the member including the attraction piece remains stationary. That is, the spring provided between the two members absorbs the overcharge caused by the return member.

FIG. 3 is a diagram showing a portion around an electromagnet of a conventional mechanism. In FIG. 3, a lever (11) provided with an attracting piece (3) made of a magnetic material is a lever (not shown) provided with a locking claw.
It rotates about the same axis (2) as the axis of. Lever (11)
Is a shaft (11a) that rotatably holds the suction piece (3) and projections (4a) and (4b) that limit the rotation range of the suction piece (3).
On the right side of the shaft (2).

The electromagnet unit (5) is made of a magnetic material and has cores (5a) and (5b).
And the base portion (5c), and the base portion (5c) is the mounting pin (7a),
It is fixed by (7b), and the coil (6) is wound around the core (5a).

The core parts (5a) and (5b) form a magnetic path by the core part (5a), the base part (5c), the core part (5b) and the attraction piece (3) when the coil (6) is energized. The magnetic force generated by the coil (6) acts strongly on the adsorption piece (3).

As shown in FIG. 3, in the mechanism in which the suction piece can rotate with respect to the lever, when the suction piece (3) and the shaft (11a) are repeatedly used, There was a case where the adsorption piece (3) was fixed to the lever (11) at a constant angle due to the heat generated at.

If, as shown in FIG. 3, the suction piece (3) and the core portions (5a) and (5b) are fixed at an angle such that they do not adhere to each other at the time of suction, for example, the suction piece (3) and the core portion ( There is a possibility that a gap (a) will occur between 5b) and the magnetic force acting on the adsorption piece (3) will weaken, causing adsorption failure and separating. Further, in this case, when the suction piece (3) is sucked, the angle of the lever (11) deviates in the left rotation direction as compared with the case where the lever (11) is normal. Lever (1
When 1) rotates to the left, in the conventional mechanism, the lever (not shown) equipped with the locking claw also rotates to the left as a unit as described above, so the locked part (not shown) is engaged. It may stop.

As described above, in the conventional mechanism, when the attracting piece is attracted to the electromagnet and the locking portion should not lock the locked portion, the locked portion is locked due to the sticking of the attracting piece. In some cases, the operating member may stop earlier than the normal timing during operation, or the operating member may not return to the initial position, which is inconvenient.

Therefore, the present invention absorbs overcharge and
The object is to solve the problem that the adhesion to the electromagnet is not normally performed due to the sticking of the attraction piece, and to make the stop lever a simple mechanism.

Therefore, in the present invention, the stop lever itself is provided with an elastic portion between the return engaging portion and the suction piece so as to absorb the overcharge caused by the return member. I am trying.

Action When the stop lever is returned by the return member, the elastic portion is distorted to absorb the overcharge. Further, at this time, even if the attracting piece is deviated by an angle such that it does not normally adhere to the electromagnet, the elastic portion is distorted to absorb this angular deviation.

EXAMPLE An example will be described with reference to FIGS. 1 and 2. here,
A stop wheel (8) for extending the lens of a camera having a plurality of teeth (8a) rotates about an axis (9). A stop lever (1) provided with a locking claw (1a), a protrusion (1e) and a shaft (1d) for a suction piece (3) rotates around a shaft (2).

The stop lever (1) is located above the shaft (2), is made of a plastic material having low flexibility and brittleness, and is biased in the counterclockwise direction. The locking part (1a) and the protrusion (1e) are on the left side of the shaft (2), and the shaft (1d) for the suction piece (3) is the shaft (2).
Is on the right side of. Then, a small width portion (1b) is provided between the shaft (2) and the shaft (1d) to make it easier to bend at this portion so that only this portion has elasticity compared to other portions. .

The suction piece (3) can rotate around the shaft (1d) on the stop lever (1), and its rotation range is the stop lever (1).
Limited by the upper protrusions (4a) and (4b).

Although not shown, the stop lever (1) is biased by a spring in the leftward rotation direction.

The electromagnet unit (5) is the same as that shown in FIG. 3 and its explanation is omitted.

The return lever (10) has a protrusion (1
It is near e) and pushes up the protrusion (1e) to move the stop lever (1) clockwise when operating.

FIG. 1 shows a state in which the attracting piece (3) is pressed by the return lever (10) so as to be in close contact with the core parts (5a), (5b) of the electromagnet unit (5).

When the camera's release switch (not shown) is touched, a current flows through the coil (6) and the attracting piece (3) is attracted by the magnetic force, and at the same time the distance measuring device operates and the amount of lens extension for focusing is determined. To be done. Next, push in the release switch (not shown) to start with the return lever (10).
Goes down and retracts from the moving range of the protrusion (1e). Next, the stop wheel (8) for extending the lens starts to rotate to the right. The rotation amount of the stop wheel (8) is monitored by the encoder, and when the rotation amount of the stop wheel corresponding to the lens extension amount determined by the distance measuring device is obtained, the current of the coil (6) of the electromagnet unit (5) is changed. Be cut off. Then, the attraction piece (3) is separated from the electromagnet unit (5) according to the urging of the stop lever (1). The stop lever (1) rotates counterclockwise according to the urging force, the locking claw (1a) fits into the tooth (8a), and stops the stop wheel (8) from rotating clockwise.

FIG. 2 shows a state in which the attraction piece (3) is separated from the electromagnet unit (5) and the locking claw (1a) is fitted in the tooth (8a).

After a shutter (not shown) or the like operates in this state, a return operation is performed according to the hoisting operation.

First, the return lever (10) rotates the protrusion (1e) to the right, and the stop lever (1) is rotated to the right. Then, the locking claw (1a) is disengaged from the tooth (8a), and the suction piece (3) reaches the suction position. The return lever (10) rotates the protrusion (1e) to the right (overcharge), and the locking claw (1a) rotates to the right, but the attraction piece (3) reaches the position where it closely contacts the electromagnet unit. You cannot rotate to the right any further. The distortion of the stop lever (1) due to the stop of the suction piece (3) causes the bendable portion (1) in the stop lever (1).
b) is absorbed by being distorted. When the overcharge reaches a predetermined amount, the return lever (10) returns to the state of FIG. 1 in which the overcharge amount is small.

If the suction piece (3) sticks to the stop lever (1) and the suction piece (3) does not come into close contact with the core parts (5a) and (5b) during suction as shown in FIG. The force of pressing the suction piece (3) against the core portions (5a) and (5b) is exerted by the overcharge, and the portion (1b) is distorted so as to absorb the deviation angle from the time when the suction piece is in close contact. However, deviation angle and part (1
There is a close relationship between b) and the amount of distortion, and
The larger the length of b), the smaller the width, and the smaller the thickness, the larger the deviation angle can be absorbed.

Effect of the Invention Since the stop lever itself has the elastic portion to absorb the overcharge, even if the adsorption piece sticks to the stop lever, the elastic portion is distorted at the time of returning, so that the adsorption piece and the electromagnet. And can be closely attached.

Moreover, even though the mechanism is capable of absorbing overcharge, the stop lever is composed of one member, so that the structure of the mechanism is simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a mechanism diagram showing a state in which the suction piece of the present invention is in a suction position, FIG. 2 is a mechanism diagram showing a state in which the suction piece of the present invention is separated from an electromagnet, and FIG. FIG. 6 is a mechanism diagram showing sticking of a suction piece to a stop lever, which is a problem. 1 ... Stop lever, 1a ... Locking part 1e ... Return engaging part, 3 ... Adsorption piece 5 ... Electromagnet, 8 ... Operating member 8a ... Locked part, 10 ... Returning member 1b ... Parts that have elasticity

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03B 9/62 A 13/36 H01F 7/08 Z

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A stop lever having a locking portion and a return engaging portion, a suction piece that moves integrally between the stop lever held by the stop lever and between a suction position and a separation position, and a suction piece. An electromagnet that attracts the magnet, an operating member that has a locked part that is locked to the locking part of the stop lever according to the movement of the adsorption piece from the adsorption position to the detached position, and the adsorption piece from the detached position to the adsorption position. A return member that moves the return lever engagement portion with overcharge so that the stop lever itself returns to absorb the overcharge during operation of the return member. A stop lever operation mechanism using an electromagnet, comprising an elastic portion between the engaging portion and the attraction piece.