JPH0243164B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a film bag using a film magazine, in which the magazine opening/closing member is fixedly locked when the film back cover is open, and the magazine opening/closing member is fixedly locked when the back cover of the film is closed. The present invention relates to a camera film back operating device having a structure in which the lock is released.

A film magazine commonly used in filmbacks uses a supply magazine loaded with unexposed film and a take-up magazine for winding film that has been photographed. It has a double structure with cylindrical members. There are two states: an open state in which the two cylindrical members are rotated relative to each other to form one opening in which the two openings face each other and the film can be pulled out, and a closed state in which this opening is not formed. It has a structure that allows it to be in one state. This film bag is provided with a magazine opening/closing operation member so that the loaded film magazine can be opened and closed from the outside of the film bag.By rotating this magazine opening/closing operation member, the magazine opening/closing operation member is integrated. The magazine opening/closing member rotates one cylinder of the magazine to open/close the magazine. In order to correctly transmit the rotation angle of the magazine opening/closing member to the magazine, the engagement relationship between the magazine and the magazine opening/closing member is established so that the magazine can be loaded into the film bag only when the magazine opening/closing member is in a specific position. is determined. That is, when the magazine opening/closing operation member is not in a position indicating that magazine loading is possible, loading of the magazine is prevented due to the direction of the notch (described later) of the magazine opening/closing member being misaligned. However, in the past, it was not possible to reliably lock the magazine opening/closing operating member in the magazine loading position, so loading the magazine was likely to be blocked.

SUMMARY OF THE INVENTION An object of the present invention is to solve this conventional drawback and provide an operating device in which loading a magazine is not blocked by a notch in the magazine opening/closing member.

In the present invention, when the film back cover is closed, the locking mechanism of the back cover is not released, and the film back cover can be opened only after the film opening/exit of the magazine is closed by the closing operation of the magazine opening/closing operation member. The above object is achieved by having a structure in which the notch of the magazine opening/closing member is fixed at a position where it is easy to load and remove the magazine in conjunction with the opening of the back cover.

Before entering into the description of the embodiments of the present invention, we will explain the structure of the above-mentioned known double structure film magazine.
This will be explained using FIG.

The take-up magazine 35 is composed of a magazine inner cylinder B, a spool C, and a magazine outer cylinder D. The protrusion Ca of the spool C is inserted into the hole Bc of the inner cylinder B, and the protrusion Ca on the opposite side of the protrusion Ca of the spool C is inserted into the hole Bc of the inner cylinder B. (not shown) are each pivotally supported in the hole Db of the outer cylinder D. The structure of the supply magazine 37 is also the same as that of the take-up magazine 35, so a description thereof will be omitted.

The magazine opening/closing members 34, 36 of the take-up magazine 35 and the supply magazine 37 are fixed to shafts 1, 22 fixed to magazine opening/closing operating members 2, 23 which can be operated from the outside of the film bag.
Each film magazine 3 is linked to the rotation operation of 23.
5, 37 (Figure 1).

The notch Bd formed in the magazine inner cylinder B for film entry and exit and the notch Dc formed in the magazine outer cylinder D for film entry and exit are configured so that they are out of phase by 180 degrees when the magazine is closed. There is.

When loading the film magazine in the direction of the arrow with the film magazine closed (Figures 3 and 4)
Figure) Projections Ba and Bb on the upper part of the inner cylinder B engage with the notches 34a and 36a of the magazine opening/closing members 34 and 36. At the same time, the protrusion Da provided on the side surface opposite to the notch Dc of the outer cylinder D fits into the recess Ea in the magazine chamber E of the film bag (FIG. 4, which is a view in the direction of arrow S in FIG. 3). In this state, the magazine opening/closing member 34,
When the magazine 36 is rotated 180 degrees, the magazine inner cylinder B also rotates due to the engagement of the notches 34a and 36a with the protrusions Ba and Bh. On the other hand, since the outer cylinder D is fixed by the engagement between the recess Ea in the magazine chamber E of the film bag and the protrusion Da of the outer cylinder, it does not rotate even if subjected to frictional torque due to rotation of the inner cylinder. As a result, the notches Bd and Dc of the inner cylinder and the outer cylinder coincide to form an opening for film entry and exit. However, in reality, the outer cylinder D and the inner cylinder B have a locking mechanism to prevent rotation, and the protrusion Ba
is the unlocking member. The protrusion Ba has a structure in which it is biased upward by spring pressure so that it can move in the vertical direction. Magazine opening/closing member 3
When the notches 34a and 36a of 4 and 36 engage with the protrusion Ba, they are pushed down and the rotation stopper is unlocked.

Fig. 1 is an explanatory perspective view showing an embodiment of the operating device of the present invention, Figs. 2A and 2B are plan views showing the operation of the main parts of Fig. 1, and Fig. 2A shows the back cover of the film back. Fig. 2B shows the film back in the closed state, and Fig. 2B shows the film back in the open state.

The perspective view of FIG. 1 shows a state in which the back cover 39 of the film bag is open and the film inlets and outlets of the take-up magazine 35 and the supply magazine 37 are closed.

The magazine opening/closing operation member 2 opens and closes the film entrance/exit of the take-up magazine 35 from the outside of the film bag by its rotation. On the operating member 2, the characters "OPEN" indicating magazine opening and the characters "CLOSE" indicating magazine closing are displayed, and the current display of each position is performed by aligning with the index 4. One end of the shaft 1 is used as an operating member 2, and the other end is used as a magazine opening/closing member 3.
It is fixed at 4. The magazine opening/closing member 34 is the third
As described above with reference to the figures, the notch 34a is configured to engage with the protrusion of the take-up magazine 35, and since the film entrance/exit is closed in FIG. It remains rolled up inside. The above members 1, 2,
4 and 34 constitute a second magazine opening/closing device. The magazine opening/closing operation member 23 opens and closes the film entrance/exit of the supply magazine 37 from the outside of the film bag by its rotation.

On this operating member 23, the characters "OPEN" indicating magazine opening and the characters "CLOSE" indicating magazine closing are displayed, and the current display of each position is indicated by index 3.
This is done by adjusting to 1. One end of the shaft 22 is fixed to the operating member 23, and the other end is fixed to the magazine opening/closing member 36. As described above with reference to FIG. 3, the magazine opening/closing member 36 is configured such that the notch 36a and the protrusion of the supply magazine 37 engage with each other.
In the figure, the film opening is closed and the unexposed film is still held on the spool in the magazine 37. The above members 22, 23, 31, and 36 constitute a first magazine opening/closing member.

FIG. 2A is a plan view showing the main parts of FIG. 1, and is in a state where it can be photographed. That is, after closing the back cover 39 of the film back, the magazine opening/closing operation member 2,
The operating member 2 is rotated clockwise and the operating member 23 is rotated counterclockwise (from the state shown in Fig. 1) so that the characters ``OPEN'' in 23 face the indicators 4 and 31, respectively. The film entrance/exit is open and the film is ready for feeding (i.e.
(ready for shooting).

A cam 3 and a disk 5 are fixed to the shaft 1, as shown in the perspective view of FIG. The shape of cam 3 is similar to that of lever 1 when closing the film opening of the magazine.
Rotate 0 clockwise. The disc 5 has a circular arc groove 5
A is formed, and the pin 6 fixed to the film back body P fits into this arcuate groove, and the groove has a shape that matches the 180 degree reciprocating rotation between the "OPEN" and "CLOSE" positions of the operating member 2. The rotation range is limited by the fixing pin 6.

The disc 5 has a notch 5b on the peripheral edge opposite to the arcuate groove 5a, which engages with an end 7a of a lever 7, which will be described later.
is formed.

The lever 7 is rotatably supported around a fixed shaft 8 by a spring 9 in a counterclockwise direction, and one end 7a can be engaged with a notch 5b of the disc 5, and the other end 7b can be engaged with a notch 5b of the film back body P. It has a structure that always fits loosely into the hole Pa. The above members 5, 6, and 7 constitute a second locking member.

The lever 10 is rotatably supported by a spring 38 around a fixed shaft 11 in a counterclockwise direction.
The end portion 10b can be engaged with. The lever 12 has a spring 13 hooked around the fixed shaft 11 to the end 12b.
is rotatably supported in a counterclockwise direction.
One end of the lever 14 has a spring 1 around the fixed shaft 11.
6 for rotation in the clockwise direction.
A pin 15 near the other end 14a of the lever 14 engages with each end 10a, 12a of the levers 10, 12 implanted therein.

Note that the fixed shaft 1 provided by the spring 16 to the lever 14
The torque around the fixed shaft 11 transmitted by the spring 38 to the lever 10 and the torque around the fixed shaft 11 transmitted by the spring 38 to the lever 10
is set to be smaller than the torque applied to the lever 12 around the fixed shaft 11.

The slide lever 17 is biased downward by a spring 20 applied to the end portion 17d, and the slide lever 17
7a and 17b are fitted into pins 18 and 19 fixed to the film bag body, respectively, and are movable.
A hook portion 17e formed on the opposite side of the end portion 17d on which the spring 20 is applied between both guide grooves has a shape that engages with a lock pin (not shown) of the back cover 39 of the film back when the back cover 39 of the film back is closed. I have it too. The upper bent portion 17c of the slide lever 17 is connected to the spring 20 to open the back cover 39.
This is a handle portion that can be pulled up in the direction of arrow A in FIG. 1 against the urging force of 1 to release the engagement between the lock portion 17e and the lock pin. A fixing pin 21 installed near the bent portion 17c of the slide lever 17 locks the end 1 of the lever 14 when the slide lever 17 is raised.
It is provided at a position where it can be engaged with 4a.

As shown in the perspective view of FIG. 1, a cam 24 having the same shape as the cam 3 described above and a disc 25 having the same shape as the disc 5 described above are fixed to the shaft 22. The shape of the cam 24 causes the lever 32 to rotate clockwise when the film opening of the supply magazine 37 is closed.

The disc 25 has an arcuate groove 25a formed therein, and a pin 26 fixed to the film back body P fits into this arcuate groove. It has a shape suitable for reciprocating rotation, and the fixing pin 26 limits the rotation range. A notch 25b that engages with an end 27a of a lever 27, which will be described later, is formed on the circumferential edge of the disc 25 on the opposite side of the arcuate groove 25a.

The lever 27 is rotatably supported by a spring 29 around a fixed shaft 28 in a counterclockwise direction.
The end a can be engaged with the notch 25b of the disc, and the other end 27b has a structure in which it is always loosely fitted into the hole Pb of the film back body P. The above members 25, 2
6 and 27 constitute a first locking member.

One end of the lever 32 is rotatably supported around a fixed shaft 33. The other end 32a of the lever 32
A lever 32 is provided between the end portion 12a of the lever 12 and
A string-like connecting member 30 for connecting the and 12 is hung.

The film back cover 39 is configured to be openable and closable via a hinge 40.

The operation of the operating device of the present invention will be explained using FIGS. 2A and 2B. First, close the back cover 39 of the film back. Each end 7 of the lever 7, 27
b, 27b are pushed in by the back cover 39 and rotate clockwise against the force of each spring, so the discs 5, 2
5 is disengaged from the notches 5b and 25b.

In FIG. 2A, when the operating members 2 and 23 are rotated clockwise from FIG. The entrance and exit will be open. By clockwise rotation of cams 3, 24 fixed to shafts 1, 22, levers 10,
The lever 12 is moved against the clockwise biasing force of the spring 16 by the biasing force of the springs 38 and 13, respectively.
4 counterclockwise, and then rotate the tip 1 of the lever 14.
4a is brought into contact with the slide lever 17, while the lever 32 is disengaged from the cam 24 and rotated counterclockwise by the lever 12 via the connecting member 30. Therefore, even if an attempt is made to pull up the bent portion 17c of the slide lever 17 in the direction of arrow A in FIG.
is locked by the end 14a of the lever and cannot be pulled up. That is, in the state shown in FIG. 2A in which the film in the magazine is exposed, the back cover 39 of the film bag cannot be opened, so that erroneous exposure of the film F is prevented.

When photographing is completed and the back cover 39 of the film bag is opened to replace the magazine, it is necessary to close the film openings of both the supply magazine and the take-up magazine.

Rotate the operating member 2 counterclockwise and the operating member 23 clockwise to "CLOSE" the operating member.
so that the characters face the indicators 4 and 31. This state is shown in FIG. 2B. First, insert the fixing pin 6 into the groove 5.
When the operating member 2 is completely rotated counterclockwise by engaging with the end of the cam 3, the tip 3a of the cam 3 moves into the lever 1.
0 to rotate the lever 10 clockwise, and at the same time, the film inlet/outlet of the take-up magazine 35 is closed. However, since the lever 14 remains biased counterclockwise by the lever 12 through engagement with the pin 15, the end 14 of the lever 14
Since the locking of the pin 21 of the slide lever 17 by a is not released, the back cover 39 of the film bag cannot be opened yet. Next, when the fixing pin 26 is engaged with the end of the groove 25a and the operating member 23 is also rotated completely clockwise, the film entrance/exit of the supply magazine 37 is closed, and at the same time the end 24a of the cam 24 is rotated completely clockwise.
rotates the lever 32 clockwise. Lever 3
Since the end 32a of the lever 2 and the end 12a of the lever 12 are connected by the connecting member 30, the lever 12 can also be rotated clockwise. As a result, lever 1
The end 12a of the lever 14 is disengaged from the pin 15 and the lever 14 is also rotated clockwise by the biasing force of the spring 16. It retreats from the position where it locks with the pin 21. Slide lever 17
It becomes possible to prepare to open the back cover 39 by pulling up the bent portion 17c.

In other words, the take-up magazine 35 and the supply magazine 37
After the film openings of both magazines are completely closed, the back cover 39 of the film bag can be opened. On the other hand, at this time, the notches 5b of the discs 5, 25,
25b is each end 7a of the lever 7, 27,
It is in a position where it can engage with 27a. When the back cover 39 of the film back is opened, the lock between the back cover 39 and the ends 7b and 27b of the levers 7 and 27 is released, so that the levers 7 and 27 are moved by the counterclockwise urging force of the springs 9 and 29. holes in the film back body P
While moving in Pa and Pb, it rotates counterclockwise until it abuts, and the ends 7a and 27a fall into the respective notches 5b and 25b of the disc.

FIG. 1 shows this state. Note that the holes Pa and Pb on the film back body are connected to the back cover 39 and the levers 7 and 2.
The rear cover 39 and the lever 7 are formed so that the engagement between the discs 5 and 25 and the levers 7 and 27 can be released by engagement of the levers 7 and 7.
By releasing the engagement of 27, the lever 7,
27 are formed so as to engage with each other. In FIG. 1, the supply magazine 37 and the take-up magazine 35 are unloaded and loaded by the magazine opening/closing member 3 of each magazine.
6, 34 in the direction of arrow C and arrow B while engaging with the notches 36a, 34a.

When the back cover 39 of the film back is open, each notch 34a, 36a of the magazine opening/closing member
Since the orientations of the magazines 35 and 37 are fixed by the locking of the disc 5 by the lever 7 and the locking of the disc 25 by the lever 27, the magazines 35 and 37 are always ready to be taken out or loaded. Therefore, there is an advantage that the magazine can be quickly taken out and loaded.

As described above, according to the present invention, when the back cover of the film bag is open, the magazine opening/closing member is securely fixed in a fixed direction of the film bag, so that the film magazine can always be easily taken out and loaded. There are advantages.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a film back safety device showing an embodiment of the present invention, Fig. 2A is a plan view of the main part of Fig. 1 with the back cover closed, and Fig. 2B is a perspective view with the back cover open. A plan view of the main parts of Figure 1 in a state where
FIG. 3 is an exploded view of a known double-structured film magazine, and FIG. 4 is a view taken along arrow S in FIG. 3, with the back cover of the film bag omitted. [Explanation of symbols of main parts] E... Film magazine chamber of film bag, 35... Winding magazine,
37... Supply magazine, 34, 36... Film magazine opening/closing member, 2, 23... Magazine opening/closing operation member, {5, 25... Disc, 6, 26... Pin, 7, 2
7... Lever} Locking member, 30... String member, 17...
Slide lever, 39...film back cover.

Claims (1)

[Scope of Claims] 1. A film magazine chamber for storing a film magazine having an openable/closable film entrance/exit; A closing position for closing the film opening/exit when the film magazine is loaded; a magazine opening/closing member that rotationally displaces the magazine opening/closing member to an open position; a back cover locking means that prevents the back cover from opening when the magazine opening/closing member is in the open position and allows the back cover to open when the magazine opening/closing member is in the closed position; an interlocking member that rotates integrally; and a protrusion that faces the engagement recess and can be engaged with the engagement recess only when the magazine opening/closing member is in the closed position, and the protrusion engages the engagement recess. A biasing force is applied in the direction of engagement with the engagement recess, and when the back cover is closed, the protrusion is moved to a first position where it does not engage with the engagement recess against the biasing force, and the back a locking member that is moved by the biasing force to a second position where the protrusion engages with the engagement recess when the lid is opened; and a locking member that engages the protrusion with the engagement recess when the back cover is opened. 1. An operating device for a film bag for a camera, wherein the magazine opening/closing member is locked in a closed position.