JPS6111712Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a release lock mechanism for a camera in which the winding shaft is not divided into upper and lower halves, for locking the release by using the preliminary angle of the winding lever.

Conventionally, a camera with a built-in release lock mechanism has a winding shaft divided into upper and lower parts, and as shown in FIG.
A winding cam 202 is fixed to the lower end of 1.
The winding cam 202 is formed with a cam surface having a stepped portion 202a, and a winding pawl 203 is rotatably supported on the lower surface of the winding cam 202 by a pin 203a, and is normally in contact with a perpendicular pin 204. is biased by a spring 205. The above winding cam 2
A lower winding shaft 206 is disposed below the winding shaft 201 on the same axis as the winding shaft 201.
A three-way pawl 207 is fixed to the upper end of the winding pawl 207 and is exposed so that the winding pawl 203 comes into contact with it.
A winding ratchet plate 26 is fixed to the lower end of the lower winding shaft 206, a one-way pawl 27 is engaged with the ratchet pawl 26a, and a pin 28 is implanted in the lower surface of the winding ratchet plate 26, so that the shutter set lever A pin 28 is fitted into a hole bored at the end of 29. Step part 2 of the winding cam 202
The tip of the release lock lever 91 is biased by a spring 92 so as to come into contact with the cam surface having the shape 02a. The middle of the release lock lever 91 is pivotally supported by a stationary member, and the other end faces a stepped portion at the lower end of the release shaft 9 so as to be engageable. When the winding shaft is configured as described above, the winding lever 1 is rotated counterclockwise in the figure to wind the winding, and when the winding lever 1 has returned to the winding start position, it is rotated clockwise and stored. Then, the tip of the release lock lever 91 touches the stepped portion 2 of the winding cam 202.
The other end of the release lock lever 91 is connected to the cam surface from 02a so that the release of the release shaft 9 is locked. Therefore, the release lock is performed as a natural operation of the camera, and is an excellent mechanism that prevents you from forgetting to release the shutter. However, during winding operations, the load on the winding lever and winding shaft is usually very large, so the winding shaft is divided into two parts, and the rotation of the upper winding shaft is transmitted to the lower winding shaft by a winding pawl and a three-way pawl. However, problems tend to occur in terms of durability. Therefore, if the two-split system is stopped and a single-shaft system is adopted, the winding lever 1 is engaged with the upper end of the winding shaft 2, and the winding ratch plate 26 is directly connected to the lower end of the winding shaft 2, as shown in FIG. Mechanically, it is not possible to provide a preliminary angle for rotating the winding lever clockwise from the winding start position described above, and a release lock mechanism has not been adopted in a single-axis type camera.

It is an object of the present invention to solve the above-mentioned drawbacks of the present invention, and to enable a release lock mechanism to be incorporated into a single-axis camera in which the winding shaft is not divided.
To provide a release lock mechanism in which a release lock switching cam that is rotated when engaged with a winding lever is provided on the outer periphery of a winding shaft, and the release lock is performed by a preliminary angle of the winding lever.

Hereinafter, the present invention will be explained with reference to the illustrated embodiments. 3 to 5, a hole 12 is formed in the center of the circular base 11 of the winding lever 1, and an arc-shaped hole 13 and a hole 14 are formed around the hole 12. Above hole 12
A crown member 21 of the winding shaft 2 is rotatably fitted into the winding lever 1, and a washer 15 is interposed between the crown members 21 on the upper surface of the winding lever 1. The above winding shaft 2
, a sleeve 22 is fixed with a pin 3, a protrusion 23 is provided on the sleeve 22, and a D
A disk 24 with a hole is placed thereon, and the crown member 2
1 is screwed and fixed to the distal end peripheral wall of the winding shaft 2. A decorative plate 25 is screwed to the tip of the winding shaft 2. The protrusion 23 of the disc 24 is inserted into the arcuate hole 13 of the winding lever 1. A winding ratchet plate 2 is located at the lower end of the winding shaft 2.
6 is directly connected to the one-way pawl 27, and a hole at the tip of a shutter set lever 29 is fitted into a pin 28 provided on the lower surface of the winding ratchet plate 26.

A cylindrical release lock switching cam 4 is rotatably fitted onto the outer periphery of the sleeve 22 fixed to the winding shaft 2. The release lock switching cam 4 consists of a stepped portion 22a provided at the upper part of the sleeve 22 and a disc 24, and a flange portion 4 that protrudes inward.
1 is inserted to determine the vertical position. A projection 42 is provided at the upper end of the release lock switching cam 4, and the projection 42 is inserted into the hole 14 of the winding lever 1. A tongue-shaped operating portion 43 extends downward from the lower end of the release lock switching cam 4.
is prominent.

The above winding shaft 2 and release lock switching cam 4
is inserted into a hole made in the immovable member 5 and held. A shaft 6 is implanted in the stationary member 5 near the periphery of the winding shaft 2 that projects downward from the stationary member 5. A stepped sleeve 61 is fitted onto the shaft 6 and is prevented from coming off with a clip 62. Two release lock levers 7 and 8 are fitted on the upper outer periphery of the sleeve 61. One of the release lock levers 7 has a forked tip, and one forked tip 71 extends in the direction of the winding shaft 2 in FIG.
It is formed to face 3. The other forked tip 72 extends downward in FIG. 4 and is further bent to form a tongue piece 72a on which one end 73a of the elastic coil spring 73 is hung. The other release lock lever 8 extends from the pivotally supported sleeve 61 to the right side in FIG.
1 faces below the release shaft 9, and is provided with a tongue piece 82 facing downward in the middle, on which the other end 73b of the coil spring 73 is latched. Further, the release lock lever 7 is provided with another tongue piece 74 facing downward, and one end 63a of the spring 63 wound around the sleeve 61 several times is latched, and the other end 63b of the spring 63 is attached to the stationary member 5.
The two release lock levers 7 and 8 are latched onto a pin 64 implanted in the winding shaft and biased in the direction of the winding axis. The release lock levers 7 and 8, which are biased in the direction of the winding axis, are brought into contact by the tongue piece 74 and the end surface of the long groove 51 of the stationary member.

If the right side of the protrusion 23 where the protrusion 23 is located in FIG. The angle is up to 13b. Also, the preliminary angle α is the starting position 13.
Turn the arcuate hole 13 to the right from a to the right end 13c of the arcuate hole 13.

To explain the winding operation and release lock operation of the winding lever 1, Fig. 4 shows the winding shaft 2.
The figure shows a state in which the winding of the shutter is released and the actuating portion 43 of the release lock switching cam 4 presses the release lock levers 7 and 8, so that the release shaft 9 is locked. From this state, move the winding lever 1 counterclockwise to a preparatory angle α degree, that is, the arc-shaped hole 13
When the right end 13c of the protrusion 4 is rotated to a position where it abuts the protrusion 23, the protrusion 4 inserted into the short groove 14
2 is rotated, and the operating portion 43 of the release lock switching cam 4 releases the pressure on the release lock lever 7. When the winding lever 1 is subsequently rotated by an angle corresponding to the winding angle β, the protrusions 23 and 42 are rotated, and when the protrusion 23 is rotated to the position shown in FIG. 6, the winding of the winding shaft 2 is completed. . Next, when the winding lever 1 is reversed clockwise and returned, the protrusion 23 remains in the above position, and only the protrusion 42 is vertically moved to return to the position shown in FIG. 7, completing one winding operation. In this state, the release shaft 9 is not locked and photography can be performed. When performing the release lock in the winding state, the winding lever 1 is rotated clockwise by a preparatory angle α degree from the state shown in FIG. 7 to the state shown in FIG. By this operation, the protrusion 2 of the winding shaft 2
3 remains in the position shown in FIGS. 6 and 7 above, only the protrusion 42 of the release lock switching cam 4 is rotated, and the actuating section 43 moves the release lock lever 7 around the shaft 6 and its sleeve 61 with the spring 63. When the release lock lever 7 is rotated, the release lock lever 8 is rotated via the coil spring 73, and its tip 81 enters and engages the push-down path of the release shaft 9, thereby locking the release. Ru. When the release lock is released and a release operation is performed, the winding shaft 2 and the protrusion 23 are moved back from the positions shown in FIGS. 6 and 7, which are returned by β degrees, to the old positions shown in FIG. 4.

As understood from the above description, the length of the arcuate hole 13 is determined by adding some margin to the winding angle β and the preliminary angle α. Further, the winding lever 1 in the position shown in FIG. 7, which has been returned to its original position after winding has been completed, may be click-stopped by a click-stop mechanism (not shown). When the release lock lever is composed of two levers 7 and 8, when the winding lever 1 is rotated by a preparatory angle of α degrees and moved to the retracted position while the release button is pressed, there is no force exerted on the lever or the operating section. No force is applied,
This is a safety mechanism that automatically locks the release when the release button is released. The release lock lever may be constructed of a single release lock lever if the engagement relationship between the operating portion and the release lock lever is reversed.

According to the present invention, it becomes possible to employ a release lock mechanism in a single-axis type winding-axis camera, which was previously impossible, and it is possible to manufacture a camera that is trouble-free in terms of winding torque.

[Brief explanation of the drawing]

Figure 1 shows a two-wheel drive system with a conventional release lock mechanism.
Figure 2 is a cross-sectional side view of a single-axis type winding shaft in which a conventional release lock mechanism cannot be incorporated, and Figure 3 is a cross-sectional view of a winding shaft equipped with the release lock mechanism of the present invention. A side view, FIG. 4 is a plan view of the main part of the above, with the release locked, FIG. 5 is an exploded cross-sectional side view of the same, and FIG. 6 is a plan explanatory diagram of the main part of the same, with the winding lever being wound up.
FIG. 7 is an explanatory plan view of the main part of the same, after the winding lever is returned and the release lock is not engaged. 1... Winding lever, 13... Arc-shaped hole, 14
... hole, 2 ... winding shaft, 23, 42 ... protrusion, 4 ... release lock switching cam, 43 ... operating section, 5 ... fixed member, 51 ... long groove, 6 ...
Shaft, 61... Sleeve, 63... Spring, 7, 8...
...Release lock lever, 71, 81...Lever tip, 73...Coil spring, 9...Release shaft.

Claims (1)

[Scope of claim for utility model registration] A single winding shaft that is not divided into upper and lower parts,
It is installed on the winding shaft so that it can rotate freely in both directions, and when the winding angle is β and the preliminary angle is α, α+
a winding lever having an arcuate hole with an opening angle of β, the winding lever being fixed to the winding shaft and loosely engaged with the arcuate hole, when the winding lever is placed in its retracted position; The starting position is a position that is ahead in the arcuate hole by a preparatory angle α than the position, and after the winding lever has rotated by a preparatory angle α from its storage position, a protrusion is pushed around at one end of the arcuate hole. and is rotatably provided on the winding shaft,
a release lock switching cam having an operating portion extending downward and reciprocatingly rotated integrally with the winding lever; and a lever pivotally connected to a stationary member of the camera, when the winding lever is in its retracted position. When the winding lever is rotated by at least a preparatory angle α, it is moved into the movement path of the shutter release shaft by the operating portion to prevent movement of the shutter release shaft, and when the winding lever is rotated by at least a preparatory angle α, the movement path of the shutter release shaft is A release lock mechanism equipped with a release lock lever that allows the shutter release shaft to move by retracting from the shutter release shaft.