JPS5812574B2 - camera hoisting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera winding device, and particularly to a camera winding device that disables a film take-up spool on the camera side when a long film magazine is attached to the camera. It is something.

When taking pictures with a long film magazine attached to the camera, film feeding and film winding both depend on the special spool inside the long film magazine, so the film take-up spool inside the camera is not used. .

However, due to the structure of conventional cameras, when the winding shaft is rotated, the film winding spool automatically rotates, so even when a long film magazine is attached, the film winding spool on the camera side does not rotate. I was letting it happen.

Therefore, if the rotation direction of the sprocket on the camera side is different from the rotation direction of the take-up spool on the camera side,
Film that is loose between the sprocket on the camera side and the film take-up spool on the long film magazine side may come into contact with the film take-up spool on the camera side and damage the film surface. There is a risk of getting caught between the sprocket of the camera and the film take-up spool on the camera side.

To prevent this, a method has been devised in which a guide plate covers the film take-up spool on the camera side, but in this method the guide plate is positioned closer to the film than the film take-up spool on the camera side. Therefore, there is a risk that the film surface may be damaged by the guide plate itself.

Also, when a long film magazine is attached to the camera,
Cameras are usually driven by electric drive devices, but due to the structure of the camera, electric drive devices have a limited power supply capacity, and within that limited power supply capacity, shutter charge, mirror up charge, EE A mechanism such as charging must be activated.

Therefore, in order to reduce power consumption, efforts must be made to reduce the winding torque of the camera.

However, when a long film magazine is attached, operating the unnecessary camera-side film winding spool merely increases the winding torque of the camera, which is extremely disadvantageous in terms of saving power.

The present invention aims to eliminate the above-mentioned drawbacks, stabilize film feeding, and reduce the winding torque on the camera side. A clutch means is provided in a transmission mechanism in an electrically driven camera having a take-up spool, and a release means for releasing the clutch means from the outside of the camera is provided. The magazine is provided with an actuating means for actuating the camera to release the interlocking relationship between the camera spool and the winding shaft.

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

FIG. 1 is a partially sectional plan view of a mechanism for interrupting the interlock between the camera winding shaft and the film winding spool according to the present invention;
2 is a partially cutaway front view of the mechanism shown in FIG. 1, FIG. 3 is a partially cutaway plan view showing the operating state of the cutoff mechanism when a long film magazine is attached to the camera, and FIG. The figure is a perspective view showing the camera with a long film magazine attached.
FIG. 5 is a sectional view showing film feeding when a long film magazine is attached.

In Figures 1 to 3, 1 is the camera winding lever;
2 is a winding shaft, 3 is a winding disc, 4 is a winding pinion,
Reference numeral 5 denotes a first winding gear, which has an integral structure.

The winding pinion 4 is connected to a shutter charge mechanism, a mirror up charge mechanism, an EE charge mechanism, etc. via a rack (not shown).

The hoisting pinion 4 also has a protrusion 4a for connection to an electric drive.

Reference numeral 6 denotes a tensioning lever rotatably supported on the winding disk 3, and is normally biased clockwise in FIG. 1 by a spring 7.

8 is a winding cam which is integrally constructed with the second winding gear 9;
The cam 8 is rotatably supported by the winding shaft 2, and the rising portion of the cam 8 is normally engaged with the projection 6a of the tensioning lever 6.

Reference numeral 10 is rotatably supported on the camera body by a reversal prevention pawl of the winding shaft 2, and is normally held in the position shown in FIG. 1 by a spring 11.

When the winding shaft 2 rotates counterclockwise in FIG. 1, the reversal prevention claw 10 engages with the claw portion 3a of the winding disk 3 to prevent the winding shaft from reversing (clockwise rotation). When the winding shaft rotates by a certain angle, the engagement between the anti-reverse claw 10 and the claw portion 3a is released, and the winding shaft can be reversed by a known method.
A spring (not shown) returns it to the position shown in FIG.

Reference numeral 12 denotes a lever for releasing the engagement between the tension lever 6 and the winding cam 8, and is always urged counterclockwise in FIG. 1 by a spring 13.

14, one end 14a of which is inserted into the hole 15a of the back part 15 of the camera body.
16 is the back cover of the camera, 17 is the main body of the long magazine, and its protrusion 17a pushes one end 14a of the pin 14 through the hole 15a.

The first winding gear 5 is connected to a sprocket 18 via a gear train.

Further, the second winding gear 9 connects to the winding spool 1 via a gear train.
9 and is also connected to a film number disc 20.

Next, the operation of the above mechanism will be explained.

First, when a short length of film (for example, 36-exposure film) is loaded, the mechanism that interrupts the interlock between the film winding shaft and the film winding spool in the camera is in the state shown in FIG. The protrusion 6a and the winding cam 8 are engaged, and by rotating the winding lever 1 counterclockwise, the rotational force of the winding lever is transmitted to the sprocket 18 via the first winding gear 5 and other gear trains. At the same time, the tension lever 6, the winding cam 8, and the second winding gear 9
and another gear train to the take-up spool 19.

Therefore, when the take-up lever rotates counterclockwise, the sprocket and take-up spool also rotate to feed the film and feed the film by a fixed length, so that normal photography can be performed.

Next, when a long film magazine is attached to the camera body in order to take pictures using a long film (for example, 250 exposure film), the protrusion 17a of the long magazine body 17 enters the hole 15a of the back part 15 of the camera body ( (See FIG. 4), and the mechanism for interrupting the interlock between the winding shaft and the film winding spool is in the state shown in FIG. 3.

That is, the pin 14 is connected to the protrusion 17 of the long film magazine body.
a is pushed upward in FIG. 3, and the tensioning lever 6 is rotated counterclockwise via the lever 12 against the spring 7, causing the winding cam 8 and the tensioning lever 6 to engage. is canceled.

Therefore, even if the winding shaft 2 is rotated, the rotation is not transmitted to the winding cam 8, so that the winding subur cannot be rotated.

When the camera equipped with the long film magazine is driven by an electric drive device (not shown) in this state, the driving force is transmitted through the protrusion 4a of the winding pinion 4, and the film is fed by the sprocket 18 and fed by a fixed length, and Shutter charging etc. are performed using the rack, but the take-up spool 19 on the camera side does not rotate.
The film F is wound up by a film take-up spool 21 (see FIG. 5) in the long magazine.

As described above, according to the present invention, since the film take-up spool on the camera side, which is not used when a long film magazine is attached, is not rotated, the sprocket 18 on the camera side, as shown by the broken line in FIG. The slack film between the film take-up spool 21 on the long film magazine side and the sprocket 18 on the camera side and the film winding spool on the camera side. This eliminates the danger of the film being caught between the film and the spool 19, stabilizes the film feeding, and improves the stability of the camera.
Side film winding system spool 19 and film number disc 2
Since the 0 is not activated, the winding torque of the camera can be reduced, which is very effective.

Furthermore, if the mechanism of the present invention that interrupts the interlock between the camera's winding shaft and the film winding spool is used in conjunction with the camera's sprocket release mechanism, it can be used as is for multiple exposure photography when using short length film, so its range of applications is wide. .

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view of a mechanism for interrupting the interlock between a winding shaft and a film winding spool in a camera according to the present invention. FIG. 2 is a partially sectional front view of the mechanism in FIG. 1. FIG. 3 is a partially sectional plan view showing the operating state of the blocking mechanism when a long film magazine is attached to the camera. FIG. 4 is a perspective view showing a state in which a long film magazine is attached to the camera. FIG. 5 is a sectional view showing film feeding when a long film magazine is attached. DESCRIPTION OF SYMBOLS 1 to 14...Camera winding mechanism and mechanism for interrupting interlocking between the camera winding shaft and film winding spool, 15...Camera main body back, 16...Camera back cover, 1
7...Long film magazine body, 18...Camera sprocket, 19...Camera film winding spool, 20...Camera film rolls, 21...Long film magazine film winding spool, F... …film.

Claims (1)

[Claims] 1. A sprocket that rotates in the film feeding direction, a take-up spool that winds the film when a long film magazine is not attached to the camera body, a wind-up shaft that can be electrically driven and rotates the sprocket; A clutch means for transmitting the rotation of the winding shaft to the winding spool, and a clutch means which is actuated by coming into contact with a member provided on the long film magazine when the long film magazine is attached to the camera body; 1. A camera hoisting device, comprising a control member that sets the means to a non-transmission state.