JP2915871B2 - Light tight cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-tight cartridge containing a photographic film in a roll.

[0002]

2. Description of the Related Art Conventionally provided single-lens reflex cameras and compact cameras are available in a 135-film film with a cartridge having a shape and size determined by the most widely used international standard (ISO 1007-1979). A so-called 35 mm film is generally used. In this 35 mm film cartridge, a resin spool around which the film is wound is housed in a metal cartridge body. A light-shielding member called telemp is attached to a film outlet of the cartridge body, and a leading end of the film protrudes from the film inlet / outlet by a predetermined length.

In order to load the cartridge into the camera, the user opens the back cover of the camera, and then inserts the cartridge body into the cartridge storage chamber while inserting a hole at the end of the spool into the spool drive shaft of the cartridge storage chamber. Then, after adjusting the leading end of the film to a predetermined position, for example, a position in contact with the winding shaft, the back cover is closed. This allows
The leading end of the film is pressed against the take-up shaft by the film retainer, and the take-up shaft rotates to take up the film, and the first frame is set on the aperture.

[0004]

However, it is very troublesome for a beginner unfamiliar with film loading to perform such a loading operation, and there are many failures. The main cause of the failure is to adjust the leading end of the film to a predetermined position. If this is inappropriate, film feeding failure occurs.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a light-tight cartridge capable of easily and reliably loading a film.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a light-tight cartridge in which a photographic film is wound around a rotatable spool in a roll and stored in a cartridge body. A recess for receiving a driving member for rotating the opening / closing lid between a closed position for bringing the cartridge body into a light-tight state and an open position for bringing the film into and out of the end surface of the cartridge body with the shaft end exposed. Is formed. Further, an inner wall surface for guiding the film to the film entrance by rotating the spool is provided inside the opening / closing lid.

[0007]

FIG. 2 shows the camera 1 in which the cartridge of the present invention is loaded with the back cover opened, and a shutter release button 3 is provided on the upper surface of the camera body 2. Also, at the center of the inside of the camera body 2,
An exposure frame 8 for defining an exposure area for one frame is formed, and a cartridge storage chamber 9 for storing a light-tight cartridge 6 and a film winding chamber 10 are provided on the left and right sides. A back cover 4 for closing the cartridge storage chamber 9 in a light-tight manner via a hinge 5 is provided to be freely openable and closable.

[0008] The cartridge storage chamber 9 is formed in a shape corresponding to the cartridge 6. In the film take-up chamber 10, there is provided a take-up shaft 11 for taking up a 135 film (hereinafter referred to as a film) 7 sent out from the cartridge 6. A sprocket gear 12 is provided on the upper side of the exposure frame 8.

As shown in FIG. 1, the cartridge 6 is formed integrally with a cartridge body 15 having a spool 14 around which the film 7 is wound and rotatably provided, and this cartridge body 15 and a hinge 6a. Open / close lid 16. These are produced as an integrally molded product of elastic light-shielding plastic, and the cross section is shown in FIG. Of the lid 16 off Ilm entrance 6b in the vicinity
The inner wall surface is formed into an arcuate portion 16a having an arc shape as shown in the figure, and the cartridge body 15 side is formed into a shape protruding inward . When the spool 14 is rotated in the direction opposite to the rewinding direction, the leading end of the film 7 moves along the arcuate portion 16a, which is the inner wall surface of the opening / closing lid 16, and moves toward the film entrance 6b.

The cartridge body 15 and the opening / closing lid 16
As shown in FIG. 1 and FIG.
8 are formed respectively. The recess 17 is provided in the cartridge accommodating chamber 9 and engages with a projection 21 for holding the cartridge body 15 at a predetermined position.
The opening / closing lid 16 is engaged with a projection 23 of an opening / closing operation lever 22 which is a driving member for rotating the opening / closing lid 16. This opening / closing operation lever 2
Reference numeral 2 denotes a stopper that is rotatably mounted on a shaft 24 fixed to the camera body 2 and that is provided below.
Is urged downward by a spring 26 so as to abut against.

The cartridge storage chamber 9 is provided with a spool drive shaft 27 which engages with the spool 14 and rotates the spool. The side of the cartridge storage chamber 9 that faces the spool drive shaft 27 is cut out, and the cut-out portion 9a is formed.
Are formed, and the cartridge 6 is dropped from the cutout portion 9a, that is, a so-called drop-in type cartridge can be loaded.

A pressure plate 28 for keeping the film on the exposure frame 8 flat is provided in the center of the inside of the back cover 4. The film is pressed against the winding shaft 11 on the hinge 5 side of the pressure plate 28. A film holding roller 29 is provided. On the side opposite to the hinge 5 side, the back cover 4 is attached to the camera body 2.
The back cover lock claw 30 is slidably mounted in the longitudinal direction of the back cover 4 via shafts 31 and 32, and is urged by a spring 33 in a direction away from the pressure plate 28. A back cover lock hole 2 a corresponding to the back cover lock claw 30 is opened in the wall of the cartridge storage chamber 9.

Further, the protrusion 2 of the opening / closing operation lever 22 is provided.
A U-shaped member 37 including a lever pressing pin 34 engaging with 2 a and a pair of lid pressing pins 35 for pressing the upper part of the opening / closing lid 16 when closing the opening / closing lid 16 is provided in the longitudinal direction of the back lid 4. It is slidably mounted and urged by a spring 38 in a direction away from the pressure plate 28. At the center of the U-shaped member 37, a back cover opening / closing knob 40 for sliding the U-shaped member 37 is attached via a projection 37a protruding to the front side of the back cover 4. The back cover 4 is formed with a long hole 41 through which the protrusion 37a passes.

The U-shaped member 37 is formed with a claw 37b bent toward the back cover 4 side.
Is slidingly operated to the pressure plate 28 side, thereby engaging with the convex portion 30a of the back cover lock claw 30. Further, if the back cover opening / closing knob 40 is slid in the same direction,
0 is moved to the pressure plate 28 side, the back cover lock claw 30 is released from the back cover lock hole 2a, and the lock of the back cover 4 is released.

A film feed switch 4 for driving a film feed motor to be described later is provided inside the back cover 4.
4 is attached. The width of one edge 4a of the back cover 4 in the longitudinal direction is wide as shown in the figure. When the back cover 4 is closed, the notch 9a of the cartridge storage chamber 9 is formed by the edge 4a. Covered light tightly.

A gear 45 is coaxially fixed to the spool drive shaft 27 as shown in FIG.
5 is a motor 4 via a gear train 46 and a gear 47.
8 is meshed with a pinion gear 49. The pinion gear 49 is meshed with the sprocket gear 12 via a gear 47. A pressing roller 51 is attached to the film winding chamber so that the film 7 can be wound around the winding shaft 11 without loosening.

In order to use the cartridge 6 constructed as described above, the back cover opening / closing knob 40 is slid to rotate the back cover 4 about the hinge 5, and as shown in FIG. The cartridge 6 containing the film is dropped from the notch 9a in a drop-in manner. When the cartridge 6 is pushed in until it abuts, the spool 14 engages with the spool drive shaft 27 and the projections 21,
The protrusions 23 enter respectively.

Next, in FIG. 4A showing a state where the back cover 4 is closed but before the back cover 4 is completely closed, the opening / closing operation lever 22 is brought into contact with the stopper 25 by the bias of the spring 26. The opening / closing lid 16 is closed light-tight. As shown in FIG. 2B, when the back cover 4 is pressed until it comes into contact with the camera body 2, the back cover lock claw 3 is inserted into the back cover lock hole 2a.
0 engages, the back cover 4 is locked to the camera body 2, and the lever pressing pin 34 presses the projection 22 a of the opening / closing operation lever 22. Thereby, the opening / closing operation lever 2
2 is rotated against the bias of the spring 26, and the opening / closing lid 16 is rotated in a direction away from the cartridge body 15, so that the film entrance 6 b is formed in the cartridge 6.

The lever pressing pin 34 is connected to the projection 22a.
Is started immediately before the back cover 4 is locked to the camera body 2 and when the cartridge storage chamber 9 is closed light-tight by the peripheral edge of the back cover 4. Further, at the final stage in which the lever pressing pin 34 presses the protruding portion 22a, the lid pressing pin 35 presses the opening / closing lid 16, but since the position is biased near the hinge 6a of the opening / closing lid 16, the film entrance 6b Does not interfere with the formation of

When the film entrance 6b is formed in this manner, as shown in FIG.
Accordingly, the movable portion of the film feed switch 44 is pressed, and the motor 48 is driven. The driving force of the motor 48 is
The power is transmitted to the spool drive shaft 27 via the pinion gear 49, the gear 47, the gear train 46, and the gear 45 to rotate the spool 14 clockwise and also rotate the sprocket gear 12 clockwise via the gear 47. Although not shown, the winding shaft 11 is also driven to rotate clockwise at the same time.

The leading end of the film 7 is moved along the arcuate portion 16a of the opening / closing lid 16, and the film entrance 6b
Is sent out to the outside. After the perforation of the film 7 is engaged with the sprocket gear 12, the rotation speed of the sprocket gear 12 is set higher than that of the spool 14, and the friction mechanism (not shown) is connected to the spool drive shaft 27. The sprocket gear 12 is driven and the film 7
Will be delivered.

When the film 7 passes through the film gate formed by the exposure frame 8 and the pressure plate 28 and enters the film take-up chamber 10 as shown in FIG. It is pressed against the take-up shaft 11 and wound up on the take-up shaft 11. Since the rotation speed of the take-up shaft 11 is faster than that of the sprocket gear 12, the take-up shaft 11 becomes the main driving of feeding, and winds up the film 7. The film 7 is wound around the winding shaft 11 without loosening by the action of the film pressing roller 29 and the pressing roller 51.

When the first sheet of the film 7 is set in the exposure frame 8, the feeding of the film 7 is stopped, the shutter is charged, and the preparation for photographing is completed. The photographer shoots by pressing the shutter release button 3 with the lens facing the subject.
When all frames of the film 7 have been shot, a film tension detecting means (not shown) detects the tension of the film 7 and starts automatic rewinding. The motor 48 is rotated in a direction opposite to the direction in which the film is fed, and the photographed film 7 is rewound on the spool 14. At the time of rewinding, the sprocket gear 12 is free to rotate, and rotates following the rewinding of the film 7. When the film 7 is completely wound around the cartridge 6, the rotation of the sprocket gear 12 stops. Sprocket gear 12
The stop of the rotation is electrically detected, and the drive of the motor 48 is stopped by this signal to complete the film rewinding.

Next, as shown in FIG. 4C, the back cover opening / closing knob 40 is slid in the direction of the arrow. The U-shaped member 37 is moved in the same direction, the lever pressing pin 34 is retracted from above the projection 22 a of the opening / closing operation lever 22, and the lid pressing pin 35 presses the upper part of the opening / closing lid 16. After the film entrance / exit 6b is closed light-tight by the opening / closing cover 16 in this way, when the back cover opening / closing knob 40 is further slid in the direction of the arrow, the claw portion 37b engages with the convex portion 30a and the back cover lock claw 30 is engaged. Move in the direction. As a result, the back cover lock claw 30 is disengaged from the back cover lock hole 2a, and the back cover 4 is unlocked. Therefore, if the back cover 4 is rotated about the hinge 5, the cartridge 6 can be collected. it can. If you release your hand from the back cover opening / closing knob 40, the spring 3
The back cover locking claw 30 and the back cover opening / closing knob 40 are returned to their original positions by the action of the back cover 3 and the back cover 38.

[0025]

As described above, according to the light-tight cartridge of the present invention, the closed position for bringing the cartridge body into a light-tight state and the film in / out position are provided at the end surface of the cartridge body where the shaft end of the spool is exposed. A recess is formed to receive the drive member that rotates the open / close lid between the open position that makes it possible for the camera and the drive member on the camera side to be easily inserted by simply dropping it into the cartridge body in the cartridge storage chamber of the camera. The film can be easily and reliably loaded in a state where the film is completely housed inside without being fitted and having troublesome positioning of the leading end of the film. Further, since the inner wall surface for guiding the film to the film entrance by the rotation of the spool is provided inside the opening / closing lid, the film can be reliably sent out by the rotation of the spool.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a light-tight cartridge of the present invention.

FIG. 2 is a perspective view of the camera viewed from behind.

FIG. 3 is an explanatory diagram showing a film feeding operation of the camera.

FIG. 4 is an explanatory view showing the operation of the opening / closing lid of the cartridge.

[Explanation of symbols]

 6 Cartridge 6b Film entrance 7 Film 14 Spool 15 Cartridge body 16 Opening / closing lid 17, 18 Recess

Claims (2)

(57) [Claims] 1. A light-tight cartridge in which a photographic film is wound in a roll on a rotatable spool and housed in a cartridge body, wherein a cartridge has an axial end portion exposed on an end face of the cartridge body. A light-tight cartridge having a concave portion for receiving a driving member for rotating an opening / closing lid between a closed position for bringing the main body into a light-tight state and an open position for allowing the film to come and go. 2. The light-tight cartridge according to claim 1, wherein an inner wall surface for guiding the film to the film entrance by rotating the spool is provided inside the opening / closing lid.