JPS5841494B2 - film production - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixed length film feed control device when a long film magazine is attached to a photographic camera, and particularly to a fixed length film feed control device for a camera that is equipped with a fixed film length feed means and can be driven electrically. The present invention relates to a film fixed length feed control device that feeds the film by a fixed length without relying on the film fixed length feeding means on the camera side when a magazine is attached.

Currently, a sprocket mechanism that engages with a perforation of the film to measure the fixed length of the film is widely used as a fixed length feeding mechanism for cameras using 35-inch film.

Conventionally, in order to accurately feed a fixed length of film, the number of teeth on the sprocket was set to 8, so that one frame of film was fed when the sprocket rotated once, and when the feed was finished, the sprocket rotation was stopped. The best method was to control fixed-length feed.

However, in recent cameras, the internal structure has become more complex, and as the camera itself is being made smaller, there is no longer enough space for the sprocket, and a sprocket with a smaller diameter and 6 teeth has been adopted. I'm here.

If the sprocket has six teeth, it is necessary to rotate the sprocket one tooth in order to feed one frame of film, so it is extremely difficult to directly control the fixed length film feed by stopping the rotation of the sprocket. It becomes difficult.

Therefore, the sprocket is always made rotatable in the film winding direction, and when the winding lever is rotated by a certain angle (for example, 1200 degrees), the sprocket is configured to rotate by one angle. By stopping the film at an angular position, the fixed length film feed is controlled.

This method is effective when using short film such as 36-exposure film, but it is effective when using long film (for example, 250
When using a magazine for single-shot film attached to the camera, the film take-up spool inside the long film magazine is forcibly rotated to prevent the film from sagging, so the film winding is completed. In this case, tension is applied to the film, which results in the inconvenience that the film cannot be fed a fixed length unless the sprocket is stopped.

In particular, when photographing with an electrically driven camera, it is often the case that the same scene is shot several times in succession and then viewed in close contact. It is a big problem that the numbers are not aligned.

Also, if the sprocket has 6 teeth, the amount of sprocket teeth applied to the film perforations will be reduced, so in order to feed the film more reliably, the rotation direction of the film take-up spool in the camera and the rotation direction of the sprocket should be adjusted. A film winding device is used which is configured such that the values are different from each other.

When using a camera equipped with this type of film winding device with a long film magazine attached, the slack film between the sprocket on the camera side and the film take-up spool on the long film magazine side will be removed from the film on the camera side. Do not touch the take-up Lisbourg and damage the film surface.
In extreme cases, there is a risk that the film will be caught between the sprocket on the camera side and the film winding lisbourg on the camera side.

The present invention eliminates the above-mentioned drawbacks, and when a long film magazine is attached to a camera that can be driven by an electric motor and has a fixed film length feeding means, it does not depend on the film fixed length feeding means in the camera. The purpose is to provide a side splitting device for feeding film by a fixed length.
The feature is that a second fixed film length feeding means is provided separately in a long film magazine used by being attached to an electrically driven camera having a first film fixed length feeding means. A means for inactivating the first fixed film length feeding means is disposed on at least one of the camera side and the front long film magazine side, and when the long film magazine is mounted on the camera, is the first
In addition to the above-mentioned structure, the fixed length film feeding means of the camera is made inactive, so that even in a camera equipped with a long film magazine, the fixed film length can be fed more accurately and stably. , the camera has a transmission mechanism for interlocking the film take-up spool with the winding shaft, a clutch means is provided in the transmission mechanism, and a release means is attached for releasing the clutch means from outside the camera. An actuation means for actuating the means is disposed on at least one of the camera side and the long film magazine side, and when the long film magazine is attached to the camera, the release means is activated by the actuation means. The clutch means is actuated to release the clutch means to disconnect the winding shaft and the film winding spool, so that the direction of rotation of the winding shaft in the camera and the film winding Lisbourg when a long film magazine is attached is determined. It is possible to prevent damage to the film due to mutual differences, and to make film feeding safer.

Further, the present invention is characterized in that the actuating means for actuating the releasing means has an operating means that can be operated from outside the camera, and the clutch means in a released state by the releasing means is operated by the operating means. In addition to the above-mentioned characteristics of a camera equipped with a long film magazine, it can also be used as a multi-exposure mechanism when using short film. be.

The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a partial cross-sectional plan view of a mechanism for interrupting the interlock between the winding shaft, film winding spool, and sprocket in a camera according to the present invention, and FIG. 2 is a partial cross-sectional view of the mechanism shown in FIG. 1. A front view, FIG. 3 is a partially sectional plan view showing the operating state of the interlocking cutoff mechanism when a long film magazine is attached to the camera, and FIG. 4 is another embodiment of the interlocking cutoff mechanism according to the present invention. 5 is a partially sectional plan view showing the operating state of the interlocking cutoff mechanism in FIG. 4, and FIG. 6 is a side sectional view of the sprocket release mechanism in the camera according to the present invention. , FIG. 7 is a partially sectional plan view of the sprocket release mechanism as seen from the bottom of the camera, and FIG. 8 is a partial plan view of the sprocket release mechanism as seen from the top of the camera.
FIG. 9 is a side sectional view showing the operating state of the sprocket release mechanism when a long film magazine is attached to the camera;
Fig. 10 is a partial cross-sectional plan view of the sprocket release mechanism in Fig. 9 when viewed from the bottom of the camera, and Fig. 11 shows film feeding when the long film magazine according to the present invention is installed in the camera. and FIG. 6 is a sectional view showing a state of fixed length operation.

First, referring to FIGS. 1 to 3, the construction of a mechanism for interrupting the interlocking movement between the winding shaft in the camera, the film winding spool, and the sprocket according to the present invention will be explained.

1 is the winding lever of the camera, 2 is the winding shaft, 3 is the winding disk, 4 is the winding pinion, and 4a is a protrusion on the winding pinion 4 for connection with the electric drive device, and these have an integral structure. .

Reference numeral 5 designates a tensioning lever rotatably supported on the winding disk 3, and the lever 5 is biased clockwise in FIG. 1 by a spring 6.

A winding cam 7 is integrally constructed with the winding gear 8, and is rotatably supported by the winding shaft 2, and the rising portion of the cam 7 is normally engaged with the protrusion 5a of the tensioning lever 5.

9 is a reversal prevention pawl for the winding shaft 2, which is rotatably supported by the camera body (not shown), and is always supported by a spring 10 to prevent the first rotation.
It is held in the position shown in the figure.

When the winding shaft 2 rotates counterclockwise in FIG. 1, the reversal prevention claw 9 engages with the claw portion 3a of the winding disc 3 to prevent the winding shaft from reversing (clockwise rotation). When the winding shaft is rotated by a certain angle, the engagement between the claw 9 and the claw portion 3a is released, and the winding shaft can be reversed by a known method and returned to the position shown in FIG. 1 by an elastic member (not shown). .

Reference numeral 11 denotes a lever for releasing the engagement between the tension lever 5 and the winding cam 7, and is biased counterclockwise in FIG. 1 by a spring 12.

13, one end 13a of which is connected to the hole 14a of the back part 14 of the camera body.
15 is the back cover of the camera, 16 (FIG. 3) is the main body of the long film magazine, and its protruding portion 16a is inserted into the back of the camera body 14 through the hole 14a and one end of the pin 13. Press 13a.

The winding gear 8 is connected to a winding spool 17 and a sprocket 18 via a gear train.

Further, with reference to FIGS. 4 and 5, the configurations of other embodiments of the mechanism for interrupting the interlock between the winding shaft in the camera, the film winding spool, and the sprocket according to the present invention will be explained. The structure of the members shown in and their functions are completely the same as in FIGS. 1 to 3.

13, one end 13a of which is connected to the hole 14a of the back part 14 of the camera body.
50 is a slidable locking plate, and pins 51 and 52 are fixed to the camera body (not shown).
A sliding guide groove 50d that can be engaged with the circumferential groove 13b of the pin 13, and a locking pawl 50c that can be engaged with the circumferential groove 13b of the pin 13, and between the bent portion 50b of the locking plate 50 and the pin 51. It is biased to the right in FIG. 4 by the passed spring 53.

The locking plate 50 further includes a tapered abutting portion 50a that can engage with a tapered abutting portion 54b of the pin 54 for releasing the engagement with the pin 13'. One end 54a of the release pin 54 enters the hole 14b in the back portion 14 of the camera body, and is biased downward in FIG. 4 by a spring 55.

Next, the structure of the sprocket release mechanism will be explained with reference to FIGS. 6 to 10.

A sprocket shaft 19 rotatably supports the sprocket 18, and a pin 20 is fixed in the center thereof.

This pin 20 is configured to engage with a notch 18a of the sprocket 18 so that rotation of the sprocket shaft 19 is transmitted to the sprocket 18.

A pin 21 is fixed to the upper end of the sprocket shaft 19, and the sprocket shaft 19 is biased downward in FIG. The gear 22 is connected to the winding gear 8 through another gear train.

(Fig. 6) Therefore, if the sprocket shaft 19 is pushed up against the spring 23, the engagement between the pin 21 and the gear 22 is released (Fig. 9), and the sprocket 18 freely rotates independently of the winding shaft 2. You will be able to do it.

The lever 24 and the lever 25 are levers for holding the sprocket shaft 19 in a pushed-up state, and are each rotatably supported by a camera body (not shown).

The lever 24 is biased clockwise in FIG. 7 by a spring 26, and when the sprocket shaft 19 is pushed up, its one end 24a touches the circumferential groove 19 of the sprocket shaft 19.
It is configured to engage with a.

When the hoisting shaft 2 rotates, the protrusion 24 of the lever 24 is moved by the protrusion 28a of the rack 28 connected to the hoisting pinion 4.
Since b is kicked, the lever 24 rotates counterclockwise against the spring 26, thereby releasing the engagement between the circumferential groove 19a of the sprocket shaft 19 and the one end 24a of the lever 24.

The lever 25 is biased clockwise in FIG. 7 by a spring 2T, and one end 25a of the lever 25 engages with a hole 14a in the back 14 of the camera body.

As shown in FIGS. 9 and 10, when a long film magazine is installed, the protrusion 16b of the magazine body 16 enters the hole 14a of the camera body back 14, so the lever 25 is pressed against the spring 27. The other end 25b falls into the circumferential groove 19a of the sprocket shaft 19 to hold the sprocket 18 in a released state.

Next, referring to FIG. 11, a description will be given of the structure of a mechanism for feeding and fixing film when a long film magazine according to the present invention is attached to a camera.

16 is a long film magazine according to the present invention, 30 is a back cover of the magazine, 31 is a camera body, and 32 is a lens barrel.

M is a motor for winding the film in the long magazine, and has a gear train of 33 and 34.

35 to a film take-up spool 36 in the elongated magazine.

Reference numeral 37 denotes a sprocket for lengthening the film in the long magazine, and is connected to the lengthening cam 40 through gear trains 38 and 39.

Reference numeral 41 denotes a tension lever for regulating the position of the length-setting cam 40, and one end 41a thereof engages with the rising portion 40a of the length-setting cam 40.

The tension lever 41 is normally biased counterclockwise by the spring 42, but when the electromagnet Mg is energized, the other end 41b of the tension lever 41 is attracted to the electromagnet Mg, and the tension lever 41 is It rotates counterclockwise against the force of the spring 42, and the engagement between the one end 41a and the rising portion 40a of the length cam 40 is released.

43 is a film supply spool, 44 is a pressure bonding plate, 45 is a film support roller, and 46 is a detection member for detecting the presence or absence of film.

Next, the operation of each of the above mechanisms will be explained.

First, when a short length film (for example, 36-exposure film) is loaded, the mechanism that interrupts the interlocking between the winding shaft, the film winding spool, and the sprocket is connected to one end 5a of the tension lever 5 and the winding mechanism as shown in FIG. Since the cam 7 is in the engaged state, by rotating the winding lever 1 counterclockwise, the rotation of the winding lever is controlled via the tensioning lever 52, the winding cam 7, the winding gear 8, and another gear train. It is transmitted to the film winding Lisbourg 17.

Furthermore, as shown in FIGS. 6 and 7, the sprocket release mechanism is in a state in which the pin 21 has fallen into the slot 22a of the gear 22, so the rotation of the winding gear 8 is caused by the gear 22 and the pin 2.
1. Sprocket shaft 19, pin 20, sprocket 18
is transmitted to the sprocket 18 via the notch 18a.

Therefore, when the take-up lever is rotated counterclockwise, the take-up spool and sprocket are also rotated to feed and set the film to a fixed length.

When rewinding the film, as shown in FIG. 6, the sprocket shaft 19 is pushed up to release the engagement between the pin 21 and the groove 22a of the gear 22.

At this time, one end 24 of the lever 24 is energized by the spring 26.
a falls into the circumferential groove 19a of the sprocket shaft 19, so the sprocket 18 remains in the released state.

When rewinding is completed and the next winding is performed, the rank 28 moves downward in FIG.
The sprocket shaft 19 is rotated counterclockwise against the rotational force, and the engagement with the sprocket shaft 19 is released.The sprocket shaft 19 is pushed down by the spring 23, and the gear 22 and the pin 21 are engaged again.
The sprocket 18 begins to rotate in conjunction with the winding shaft.

Next, when attaching a long film magazine to the camera body in order to take pictures using long film (for example, 250 exposure film), first press the sprocket shaft 19 on the camera side.
is pushed up to engage the circumferential groove 19a of the sprocket shaft 19 and one end 24a of the lever 24.

When a long film magazine is attached to the camera in this state, the sprocket release mechanism is activated by rotating the lever 25 counterclockwise by the protrusion 16b of the long film magazine body 16, as shown in FIGS. Since the circumferential groove 19a of the shaft 19 and the end 25b of the lever 25 engage with each other, the sprocket 18 remains in the released state unless the long film magazine is removed.

Further, the operation of the mechanism in the camera that interrupts the interlocking movement between the winding shaft, the film winding spool, and the sprocket is shown in FIG.

That is, when the long film magazine is attached to the camera body, the protrusion 16a of the long film magazine body 16 enters the hole 14a of the camera body back 14 as shown in FIG. The pin 13 is pushed upward at
The tensioning lever 5 is rotated counterclockwise via the lever 11 against the spring 6, and the engagement between the winding cam 7 and the tensioning lever 5 is released, and the winding shaft 2 and the film winding lisbourne are disengaged. 17 and the subrocket 18 are cut off.

This state will continue unless the long film magazine is removed from the camera body.

The operation according to another embodiment of the mechanism for interrupting the interlock between the winding shaft and the film winding spool and sprocket in the camera is shown in FIG.

That is, when installing a long film magazine, when one end 13a of the pin 13 in the state shown in FIG. is rotated counterclockwise against the spring 6 to release the engagement between the winding cam 7 and the tensioning lever 5.

At this time, the locking pawl 50c of the locking plate 50 falls into the circumferential groove 13b of the pin 13 due to the action of the spring 53, and the state in which the interlocking movement between the winding shaft 2, film winding spool 17, and sprocket 18 is interrupted continues. be done.

In order to restore the interlocking relationship described above, one end 54a of the pin 54 in the state shown in FIG.
When pressed, the locking plate 50 moves to the left in FIG. 5 against the spring 53 because the circumferential abutting portions 50a and 54b are tapered.

Therefore, the engagement between the circumferential groove 13a of the pin 13 and the locking pawl 50c of the locking plate 50 is released, and the mechanism for interrupting the interlocking between the winding shaft, the film winding Lisbourg, and the sprocket is in the state shown in FIG. Return.

As described above, even if the winding lever 1 is rotated with the interlocking relationship between the winding shaft in the camera and the film winding Lisbourg and sprocket cut off, the shutter charge, mirror charge, etc.
Although the EE mechanism charges, etc., the winding gear 8 does not rotate, the film winding spool 17 and sprocket 18 do not rotate. Therefore, even if the winding shaft 2 rotates, the camera does not perform shutter charging, mirror charging, EB mechanism charging, etc. The film is not wound to a fixed length.

However, at this time, the teeth of the sprocket 18 on the camera side are engaged with the perforations of the film F, so when the film F is transferred, the sprocket 18 rotates.
This rotation is transmitted to the film take-up spool 17 via the wind-up shaft 2, causing the spool 17 to rotate.

Therefore, if the sprocket 18 is further released at this time so that it can freely rotate, the sprocket 18 will rotate as the film F is transferred, but the rotation will not be transmitted to the film take-up spool 17 and the spool will 17 remains stationary.

The operation when a camera equipped with a long film magazine in the above-described state is driven by a known electric drive device (not shown) that rotates a winding shaft and releases a shutter is as follows.

First, as shown in FIG. 11, the film F is loaded into the long film magazine body 16, and the shutter release is performed by operating the release button (not shown) of the camera using an electric drive device (not shown).

At the same time as the shutter release, the electromagnet Mg in the long film magazine is energized, and the tension lever 41 is rotated counterclockwise against the spring 42, causing one end 41a of the lever 41 and the film length cam 40 to rise. The engagement with the portion 40a is released.

After the shutter release is completed, the winding shaft 2 on the camera side is rotated by the electric drive device to charge the shutter.
At the same time as mirror charging, EE mechanism charging, etc., the film winding motor M on the long film magazine side is energized, and the film winding Lisbourg 36 on the long film magazine side is rotated via the gear train 33, 34, 35. and start winding the film.

At this time, since the engagement between the rising portion 40a of the standard length cam 40 and the one end 41a of the tension lever 41 is released, the sprocket 37 on the long film magazine side can rotate, and the sprocket on the camera side can also rotate. 18 is in a freely rotatable state as mentioned above, and the film winding spool 17 on the camera side is always in a stationary state regardless of the sprocket, so that the film can be wound safely and smoothly without damaging it. I can do it.

After film winding is started, when the power to the electromagnet Mg is cut off, the tension lever 41 is rotated clockwise in FIG. At the time of one rotation, it engages with the rising portion 40a of the film length cam 40, and accurately completes the film length feeding.

At this point, power to the film winding motor M is cut off.

As described above, after completing the shutter charging, mirror charging, EE mechanism charging, etc. by the winding shaft 2 on the camera side, and the fixed length feeding of the film by the film fixed length feeding means on the long film magazine side, the following steps are performed. It is possible to repeatedly take pictures by releasing the shutter.

As described above, according to the present invention, when a long film magazine is used, it is possible to control the fixed length feeding of the film by the film fixed length feeding means in the long film magazine, so that it is possible to obtain photographs with stable screen spacing. I became able to do it,
Also, since the film take-up spool inside the camera is configured not to rotate when using a long film magazine, the first
There is no danger of the film being wound up due to the fact that the rotational force direction of the film winding spool 17 in the camera and the rotational direction of the sprocket 18 in the camera are made different from each other as shown by the broken line F in FIG.

Further, according to the present invention, since the distance from the photographing aperture of the camera to the film fixed length feeding sprocket can be increased, the flatness of the film can be maintained in a good condition during photographing.

Furthermore, in the device according to the present invention, the motor inside the camera performs shutter charging, mirror charging, EE mechanism charging, etc., and the motor inside the long film magazine winds the film. Since the output of the film winding motor is small and the inertia of the motor is also small, when winding the film, the perforations of the film are prevented from being damaged by the teeth of the sprocket, and the film is wound softly (during film winding, This allows the film to be wound without tightening the winding spool.

It goes without saying that the interlocking/blocking mechanism between the winding shaft and the film winding Lisbourg and sprocket in the camera described above may also be used as a multiple exposure mechanism when using a short film.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view of a mechanism for interrupting the interlock between a winding shaft, a film winding Lisbourg, and a sprocket 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 interlocking cutoff mechanism when a long film magazine is attached to the camera. FIG. 4 is a partially sectional plan view showing another embodiment of the interlocking shutoff mechanism according to the present invention. FIG. 5 is a partially sectional plan view showing the operating state of the interlocking cutoff mechanism in FIG. 4. FIG. 6 is a side sectional view of a sprocket release mechanism in a camera according to the present invention. FIG. 7 is a partially sectional plan view of the sprocket release mechanism as seen from below the camera. FIG. 8 is a partial plan view of the sprocket release mechanism viewed from above the camera. FIG. 9 is a side sectional view showing the operating state of the sprocket release mechanism when a long film magazine is attached to the camera. FIG. 10 is a partially sectional plan view of the sprocket release mechanism shown in FIG. 9 when viewed from below the camera. FIG. 11 is a cross-sectional view showing the state of film feeding and length-fixing operations when the long film magazine according to the present invention is attached to the camera. 1 to 13, 13 and 50 to 55... Camera winding mechanism and mechanism for cutting off interlocking between the winding shaft and the film winding spool and sprocket, 14, 1
4, 14... Back of camera body, 15...
・Camera back cover, 17...Camera film winding spool, 18 to 28...Camera sprocket mechanism and sprocket release mechanism, 16...
...Long film magazine body, 30... Magazine back cover, 31... Camera body, 32...
...Camera lens barrel, 33 to 36...
-Film winding mechanism of long film magazine, 37 to 42...Film fixed length feeding mechanism of long film magazine, 43...Film supply spool of long film magazine, 44... ...Crimp plate, 4
5...Film support roller, 46...
...Member for detecting the presence or absence of film, F...
Film, M...Motor, Mg...
electromagnet.

Claims (1)

[Claims] 1. By regulating the operation of the winding lever to a predetermined amount, the first sprocket is rotated by one frame of film feeding, and a long film magazine attached to a camera that can be driven electrically, A take-up spool is electrically driven to feed the film, is rotated by the film being fed, and is locked from rotation by a locking member when the film is fed by a frame. and an electromagnetic means for actuating the locking member to release the lock, and when the long film magazine is attached to the camera, the winding lever and the first A fixed length film feed control device, characterized in that it is provided with a clutch means for placing the sprocket in a non-moving relationship.