JPS6113570B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for indicating the presence or absence of a light shielding sheet for a film pack loaded in a camera.

Conventionally, for example, in a film pack using a self-processing type camera, a light-shielding sheet is interposed at the forefront of a housed film unit capable of diffusion transfer photographic processing in order to facilitate loading during the day.

By the way, regarding taking out the light-shielding sheet from the film pack, cameras have been put into practical use in which the film pack is loaded into the camera and the light-shielding sheet is automatically fed out at the same time as the loading opening is closed. This requires a separate sequence circuit from the sequence circuit that feeds out the film unit in conjunction with the shutter release, making it complicated and expensive.In addition, the light-shielding sheet is fed out suddenly, so it is necessary to close the loading slot as described above. There were problems such as the camera sometimes hitting the photographer's hand.

The present invention has been made in view of the above-mentioned problems of the conventional art, and uses a simple mechanism to display the presence or absence of a light-shielding sheet in the viewfinder without using a sequence circuit. To provide a light-shielding sheet presence/absence display mechanism in which the presence or absence of the light-shielding sheet can be checked with a viewfinder by switching the presence display to the absence display at the time of the first shutter release for sending out the light-shielding sheet.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a self-processing camera has a square pyramid-shaped lens barrel 3 that supports a photographing lens 1, an exposure meter 2, a shutter mechanism, etc. on the front side.
It has an external appearance that supports a relatively flat, roughly rectangular box-shaped camera body 4. While holding the grip 5 on the left side of the camera body 4 and looking through the viewfinder 6, press the shutter button 7. By pressing down, the film unit U in the film pack 8 loaded in the camera body 4 is exposed imagewise.

As shown in FIG. 3, the film pack 8 is stored in a relatively flat rectangular box-shaped pack body 8b with an exposure frame opening 8a on the front surface, in which a large number of film units U with the same orientation are stacked one on top of the other. death,
A film unit feed mechanism (not shown) that operates in conjunction with the shutter release moves the exposed film unit U from the unit outlet 8d to the camera body 4 with a feed pawl that fits into the notch 8c of the pack body 8b. The film unit is fed between a pair of pressure rollers (not shown) provided at the top, and while being pressurized by the pressure rollers, it is released from the camera body 4 through a slit-shaped film unit outlet 9 formed on the upper surface of the camera body 4. It is becoming more and more common to be sent to.

In addition, film unit U of film pack 8
A light-shielding sheet 10 is interposed at the forefront to facilitate handling during the day, and before the film unit U is pressurized, it is sent out to the outside of the camera using the same process as the film unit U described above. It's becoming like that.

On the other hand, as shown in FIGS. 4 and 5, a film pack 8 is inserted into the camera body 4 from above.
A roughly U-shaped board 12 is provided that defines a film pack loading chamber 11 into which a film pack 8 can be loaded, and a confirmation window is provided in the wide center of the board 12 so that the presence or absence of a film pack 8 can be confirmed from outside the camera. 13, and left and right support plates 14 and 15, which stand up in the same direction, are integrally supported on both sides.

Coaxial bearing holes 16 and 16 are provided in the lower portions of the left and right support plates 14 and 15, respectively, to rotatably support both ends of the interlocking shaft 17, while the end of the interlocking shaft 17 of the right support plate 15 Square shaft portion 17a of
, the detection part 19a at the tip is connected to the right support plate 15.
A pack detection lever 19 projecting from a notch 18 to the lower part of the film pack loading chamber 11 is fitted and integrated.

The detection lever 19 is provided with a first coil spring 20 and a second coil spring 21 that bias the detection lever 19 in the counterclockwise direction so that the detection lever 19 always projects into the film pack loading chamber 11.
When it comes into contact with the lower part of the loaded film pack 8, it swings around the hour hand against the biasing force of each coil spring 20, 21, thereby rotating the interlocking shaft 17.

On the left support plate 14 side, there are long grooves 22, 2.
A shutter release lever 24 is provided which is guided in a vertically movable manner by pins 23, 23 that fit into the shutter release lever 24,
The raising and lowering of the shutter button 7 is linked with the coil spring 24b.

A release lock lever 25 capable of locking the rising edge 24a of the release lever 24 is fitted and integrated into the square shaft portion 17b of the interlocking shaft 17, and normally locks the release lever 24 so that it cannot be lowered, and also locks the release lever 24 so that it cannot be lowered. This lock is released when the detection lever 19 that detects the loading of the 8 is swung around the hour hand via the interlocking shaft 17.

On the other hand, bent portions 28a and 28b are fitted to both outer surfaces of the lower tips of the left and right support plates 14 and 15, respectively, and the caulking holes 27 are fitted through washers 26 and 26.
A narrow U-shaped display lever 2 that is swingably supported by pins 27, 27 caulked to a, 27a.
8 supports a red display piece 30 facing the viewfinder optical path at one end, in front of the objective lens 6a of the viewfinder 6, and at the other end 3.
A swinging lever 31 that swingably supports 1a,
While connected by the interlocking wire 32, the bent portion 28
The upper riser 33 of b is brought into contact with the upper edge of the detection lever 19, and the second wire spring 21 is brought into contact with the upper edge of the detection lever 19.
One end is hooked to the swing lever 31, and the spring force of the second wire spring 21 causes the detection lever 19, the display lever 28, and the interlocking wire 3 to be connected.
2. The swing lever 31 and a series of display mechanisms are mutually energized and stopped by the upper riser 33. Therefore, when the detection lever 19 is pushed out, the display piece 30 faces into the viewfinder 6, indicating that the light-shielding sheet 10 is inside the film pack 8, and when the detection lever 19 is retracted, the display piece 30 is moved into the viewfinder 6. 6 to display that the light shielding sheet 10 is not inside the film pack 8.

On the outer surface of the left support plate 14, there is provided an inverted L-shaped display locking lever 35 which is swingably supported by a pin 34 whose bent portion is caulked into a caulking hole 34a, and a coil spring biased around the needle. 36 is attached to the rising edge 24 of the release lever 24.
a, and when the release lever 24 is lowered, that is, when the shutter is released, it is swung counterclockwise, and the bent portion 28a of the display lever 28 can be locked with the hook portion 37 at the other end. This lock is released when the shutter is released for the first time.

In the self-processing camera equipped with the presence/absence display mechanism of the light-shielding sheet 10 configured as described above, now,
If film pack 10 is not loaded,
The detection lever 19 is positioned at the protruding position by the first coil spring 20 and the second coil spring 21, and the lock lever 25 locks the release lever 24 via the interlocking shaft 17.
9, the display lever 28 is activated via the upper riser 33.
is held in the locking position by the locking lever 35,
The display piece 30 of the swing lever 31 faces into the viewfinder 6 via the interlocking wire 32.

Next, when the film pack 10 is loaded into the film pack loading chamber 11, the detection lever 19 swings to the retracted position, the lock lever 25 also swings via the interlocking shaft 17, and the release lever 24 is unlocked. It becomes like this.

At this time, since the display lever 28 is locked by the locking lever 35, the second coil spring 21 is charged by the swinging of the detection lever 19, and the display piece 3
0 remains facing the inside of the viewfinder 6, and it is displayed to the photographer that the light-shielding sheet 10 is present in the film pack 8.

Then, when the shutter button 7 is pressed down to perform the first shutter release, the release lever 24
is lowered, operating the shutter mechanism mentioned above, and also operating the film unit feeding mechanism.
While the light-shielding sheet 10 at the forefront of the film pack 8 is fed out from the film unit outlet 9, the locking lever 35 swings as the release lever 24 descends, causing the locking lever 35 to close to the display lever 28.
When the lock is released, the display lever 28 swings around the hour hand via the interlocking wire 32 and the swing lever 31 by the stored force of the second coil spring 21, and the swing lever 3
The first display piece 30 is retracted to the outside of the viewfinder 6 to display to the photographer that the light-shielding sheet 10 is not present in the film pack 8.

When the photographer takes out the empty film pack 8 from the film pack loading chamber 11 after performing several shooting operations, the second coil spring 21 swings the detection lever 19 to the protruding position and the lock lever 25 to the lock position. At the same time, the display lever 28 as well as the detection lever 19 swings to the locking position via the upper riser 33, and is locked again by the locking lever 35, so that the display piece 30 of the swinging lever 31 is moved to the viewfinder 6.
Return to face within.

As is clear from the above explanation, the present invention
A detection lever that detects whether a film pack is loaded or unloaded, a release lock lever that is linked to the lever, a display lever that displays the presence/absence of a light-shielding sheet in the camera's viewfinder, and a display lever in which the lever is normally located. A display locking lever is provided that locks the shutter and switches it to the absent display position at the first shutter release operation. The presence or absence of the light shielding sheet can be easily checked within the viewfinder.

Further, since the present invention is a mechanism composed of a detection lever, a release lock lever, a display lever, and a display locking lever, there is no need for a complicated and expensive sequence circuit as in the above-mentioned conventional systems, and the mechanism is simple and inexpensive. This can contribute to reducing camera costs.

Furthermore, since the light-shielding sheet is sent out when the shutter is released for the first time, there is less risk of it hitting the photographer's hand, allowing for safer shooting operations. be.

[Brief explanation of the drawing]

Fig. 1 is a front perspective view of the self-processing camera, Fig. 2 is a rear perspective view of Fig. 1, Fig. 3 is a perspective view of the film pack, and Fig. 4 is a perspective view of the light shielding sheet presence/absence display mechanism. , FIG. 5 is a side view of FIG. 4. 4...Camera body, 6...Finder, 8...
Film pack, 10... Light shielding sheet, 19...
Pack detection lever, 24...Shutter release lever, 25...Release lock lever, 28...
... Display lever, 30 ... Display piece, 31 ... Swing lever, 32 ... Interlocking wire, 35 ... Display locking lever.

Claims (1)

[Scope of Claims] 1. A camera in which a film pack in which a light-shielding sheet is interposed at the forefront of a large number of stacked films is loaded into a film pack loading chamber. means for detecting that the light-shielding sheet is loaded; means for displaying the presence or absence of a light-shielding sheet in the viewfinder of the camera; A light-shielding sheet presence/absence display mechanism for a film pack, comprising an interlocking means for switching from a light-shielding sheet presence display to an absence display.