JPH0235969B2 - KAMERANIOKERUSHUDOMAKIAGE * DENDOMAKIAGEKIRIKAESOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a manual winding/electric winding switching device for a camera equipped with both manual and electric winding gear trains.

BACKGROUND OF THE INVENTION Recently, electric winding cameras with built-in motors have been rapidly increasing as part of camera automation.

In such cameras, the camera body does not have a power supply, and only when attached to a specific device, such as a fundus imaging device or an X-ray imaging device, power is supplied from the device's power source to the camera and the electric winding function is activated. However, when the camera is removed from the device, in order to perform shooting preparation operations such as loading film, in addition to the electric winding gear train, a manual winding gear train that can also be used to wind the film manually is required. We must prepare.

In addition, even if it is not a special camera like the one mentioned above, but a general electric winding camera, by providing both manual and electric winding wheels, there will be no problems when the battery runs out or when the battery capacity decreases in cold regions. It is convenient because I can continue shooting without any problems.

However, with the conventional manual winding/electric winding switching device installed in such cameras, it is necessary to switch between an electrical changeover switch and a mechanical clutch mechanism when switching between manual and electric winding. Not only is there a difficulty in operability, but forgetting one of these operations not only makes winding impossible, but also often causes malfunctions.

Furthermore, although it is conceivable to perform these operations in one action, it would be necessary to perform the switching operation every time there is a manual or electric switching, and there is often a risk of erroneous operation.

Purpose This invention was made in view of the above points,
For cameras equipped with both manual and electric winding gear trains,
Manual winding for cameras that does not require a special switching operation and allows for electric winding normally and manual winding when operating the winding lever.
The object of the present invention is to provide an electric hoisting switching device.

Configuration Therefore, the manual hoisting/electric hoisting switching device for a camera according to the present invention is provided with a clutch gear that connects and disconnects the gear train for each of the manual and electric hoisting gear trains, and connects either one of these clutch gears. and a clutch switching member that shuts off the other.
A switching lever interlocked with the rotation of the hoisting lever within a margin angle is used to drive the manual hoisting gear train in the direction of connection, and the switching lever also opens the power supply circuit of the electric motor.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, a main drive gear 3 that is integrated with a three-part cam 2 driven by a hoisting lever 1 meshes with a first clutch gear 6 via idle gears 4 and 5, and is connected to the lower side of the first clutch gear 6. A second clutch gear 7 having the same diameter and the same axis is provided in contact with the first sprocket gear 8,
It meshes with a spool gear 10 that is frictionally coupled to a winding drum spool (not shown) via an idle gear 9.

The first sprocket gear 8 is connected to the sprocket shaft 1
1, and a second sprocket gear 12 is fixedly attached to the lower end of the shutter hoisting gear 13.
These gears 3 to 10 and 1
2 and 13 constitute a manual hoisting wheel train.

A sprocket 14 is loosely fitted onto the sprocket shaft 11 via a known clutch mechanism so as to be freely engageable and detachable in the rotational direction.

On the other hand, a gear 17 is fixed to a rotating shaft 16 of an electric motor 15 housed in the winding drum spool, and a gear 17 is connected to the first and second clutch gears 6, 6 through a reduction gear group 18.
The third clutch gear 19 is coaxial with the third clutch gear 7.

As shown in FIG. 2, the first and second clutch gears 6 and 7 have the same square shaft holes 6a and 7a, and the third clutch gear 19 has a square portion 1.
9b, a shaft hole 19a having a circular portion 19c and an escape hole portion 19d is bored.

A clutch switching shaft 20 is provided which connects the first and second clutch gears 6, 7 and the third clutch gear 19 and constitutes a clutch switching member. Shaft hole 6
A, 7a is formed with a rectangular portion 20a which is slidable in the axial direction and moves together in the rotational direction, and a third portion is formed at the lower end.
A square part 20b that is slidable in the axial direction and moves together in the rotational direction is formed in the square part 19b of the shaft hole 19a of the clutch gear 19, and a truncated conical part 20c whose maximum diameter is one side of this square part 20b. Flange portions 20d and 20e are provided with some distance between them.

Further, as shown in FIG. 3, a switching cam 21 consisting of a low step part 21a and a high step part 21b is integrally fixed to the hoisting lever 1, and an L-shaped switching lever with one end in contact with the cam surface. 22 is pivotally connected to the camera body by a shaft 23, and has a left-handed rotation behavior by engaging a spring 24, and the other end is a movable contact piece 25a of a normally closed power switch 25 inserted into the power circuit of the electric motor 15. It serves to open and close the switch 25 by engaging and disengaging the switch 25.

The power switch 25 side of the switching lever 22 is connected via an intermediate lever 26 to an L-shaped drive lever 2 that is displaced in a plane perpendicular to the displacement plane of the switching lever 22.
7 is pivotally connected by a shaft 28, and its tip end is connected to the second
As shown in the figure, the clutch switching shaft 20 is fitted between the flange portions 20d and 20e, and the flange portion 2
0d and 20e are driven up and down, respectively, to move the clutch switching shaft 20 up and down within a predetermined range.

In this embodiment configured as described above, when the hoisting lever 1 is in the retracted position, the switching lever 2
One end of 2 engages with the low step portion 21a of the switching cam 21, and the other end engages with the movable contact piece 25 of the power switch 25.
Since the movable contact piece 25a is detached from the
is in contact with the fixed contact piece 25b due to its own spring property, and the power switch 25 is kept in the closed state.

Further, the intermediate lever 26 moves to the right, and the drive lever 2
7 is turning to the right, the clutch switching shaft 20 has moved to the lower end.

4, the upper square portion 20a of the clutch switching shaft 20 is connected to the first clutch gear 6.
The lower square portion 20b is engaged only with the square shaft hole 7a of the second clutch gear 7, and the lower square portion 20b is engaged with the square shaft hole 19b of the third clutch gear 19.

Therefore, the first clutch gear 6 and the second clutch gear 7 become free, and the manual hoisting gear train 3 to
6 is removed from the hoisting gear train, and the electric hoisting gear train 17~
The film is wound up by 19, 7-10, and the shutter is charged by the gear train 12, 13.

The electric motor 15 is started by a start switch 29 (see FIG. 1) which is closed when the release button is started or when the shutter operation is completed.

Next, when the hoisting lever 1 is pulled out by an allowance angle, the high step part 21b of the switching cam 21, which is integrated with the hoisting lever 1, rotates the switching lever 22 to the right against the spring 24 to move the switching lever 22 to the third position.
In the state shown in the figure, the movable contact piece 25a is lifted and separated from the fixed contact piece 25b, and the power switch 2
5 is released, the intermediate lever 26 moves to the left to rotate the drive lever 27 to the left, and the clutch switching shaft 2
0 rises to the state shown in FIG.

As a result, the upper square part 20a of the clutch switching shaft 20 is engaged with the square shaft holes 6a and 7a of the first and second clutch gears 6 and 7, and the lower square part 20b is inserted from the shaft hole square part 19b of the third clutch gear 19. break away.

Therefore, the third clutch gear 19, the reduction gear group 18, and the gear 17 are removed from the winding train, and the film is wound by the manual winding train 3 to 10.
The shutters are charged by the wheel trains 12 and 13.

In this case, even if the start switch 29 is closed due to activation of the release button or completion of shutter operation, the electric motor 15 will not be energized because the power switch 25 is open.

Furthermore, when the film is to be rewound after photography is completed, the sprocket shaft 11 and the sprocket 14 are uncoupled in the rotational direction by a known clutch mechanism, so that the film can be rewound independently of both manual and electric winding gear trains. be able to.

Effects As described above, according to the present invention, manual,
In a camera having both electric winding gear trains, a clutch gear for continuing the gear train provided in each gear train, a clutch switching member that connects one of these clutch gears and disconnects the other, and a margin for the winding lever. A switching lever is provided that connects the manual hoisting gear train by driving the clutch switching member in conjunction with the rotation within the corner and disconnects the electric hoisting gear train, and also connects and disengages the switching lever to connect the electric motor. Since a power switch is provided to open and close the power supply circuit, when the hoisting lever is retracted, the manual hoisting train is cut off and only the electric hoisting train is connected, at the same time the electric motor's power circuit is closed. When the electric hoisting state is reached and the hoisting lever is pulled out by an allowance angle for manual hoisting, the electric hoisting gear train is cut off and the manual hoisting gear train is connected, and the power supply circuit of the electric motor is opened. No special switching operation is required in each case, and excellent operability is achieved, with no fear of erroneous operation.

[Brief explanation of drawings]

Fig. 1 is a configuration and circuit diagram showing one embodiment of the present invention, Fig. 2 is an exploded explanatory view showing a clutch mechanism for disconnecting and disengaging the hoisting gear train, and Fig. 3 is an exploded explanatory view showing the clutch mechanism for manual hoisting and electric FIG. 4 is an explanatory diagram showing the clutch disengagement state during electric hoisting, and FIG. 5 is an explanatory diagram showing the clutch disengagement state during manual hoisting. 1... Hoisting lever, 6... First clutch gear,
7...Second clutch gear, 15...Electric motor,
19...Third clutch gear, 20...Clutch switching shaft, 21...Switching cam, 22...Switching lever,
25...Power switch.

Claims (1)

[Claims] 1. In a camera having a manual hoisting gear train linked to a hoisting lever and an electric hoisting gear train linked to an electric motor, the gear train provided in each of the manual hoisting gear train and the electric hoisting gear train is A clutch gear for disconnecting, a clutch switching member for connecting one of these clutch gears and disconnecting the other, and driving the clutch switching member in conjunction with rotation of the hoisting lever within a margin angle. A camera characterized in that it is provided with a switching lever that connects the manual hoisting gear train and shuts off the electric hoisting gear train, and a power switch that engages and disengages from the switching lever to open and close the power supply circuit of the electric motor. Manual hoisting/electric hoisting switching device.