JPS6259289B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film loading device for a camera that uses film stored in a cartridge, and is particularly suitable for application to a camera that adopts an easy loading method in which the leading edge of the film is automatically wound. The present invention relates to a film loading device.

In a camera that uses perforated film stored in a cartridge, after loading the cartridge into the cartridge chamber in the camera body, pull out an appropriate amount of the leader of the film from the cartridge and insert the tip of the film into the camera. Insert the film into the take-up spool and wind it, make sure that the film is taken up properly, engage the perforation of the film with the sprocket, close the camera back, take one or two blank shots, and start the actual shooting. Requires steps.

The film loading operation using the conventional cartridge not only requires extremely troublesome work as described above, but also has the problem of being prone to winding failures.

For this reason, recent improvements have been made to the take-up spool to make it easier to securely attach the leading edge of the film, and a presser plate is installed on the camera body to hold the leading edge of the film. Various cameras have been provided that employ the so-called easy loading method, in which the object is guided and automatically wound.

However, when loading a cartridge into a camera having this type of automatic winding mechanism and attaching the tip of the film pulled out from the film outlet to the spool, the film outlet is closed to prevent curling due to the film's winding. The elasticity causes the film to point diagonally upwards, and as a result, the portion of the film that is being pulled out is curved upwards and does not engage the sprocket, and the tip of the film may come off the spool or may not wind properly. In addition, if you close the camera back in this state, the upwardly curved part of the film will be pressed, causing various problems such as the film becoming slack or the tip of the film popping off the spool. It was an inconvenience.
Particularly in the case of a camera that employs an easy loading method, winding is left up to the camera, so the user is unaware of poor winding, which can lead to serious mistakes in photography.

In view of this, the present invention forcibly corrects the direction in which the film drawer opening of the cartridge is placed by closing the camera back after loading the cartridge into the camera, and after closing the camera back, the cartridge is placed in the cartridge storage chamber. The object of this invention is to provide a camera film loading device which can stably hold the film, give the film the best possible course, and ensure that the film is wound around the spool.

The present invention will be described below with reference to embodiments shown in the drawings.

A back cover 3 is pivotally supported by a shaft 4 at the end on the side of the cartridge storage chamber 2 provided at one end of the camera body 1, and a cartridge correction mechanism 5 is mounted on the inner surface of the base of the back cover 3 near the shaft 4. It is provided.

The cartridge correction mechanism 5 has a cartridge opening correction plate 7 that is pivotally supported by a shaft 6 at the base of the back cover 3, and when the back cover 3 is closed, the cartridge opening correction plate 7 has a distal end portion. 7a has a length that can cover the film outlet 8a of the cartridge 8 when it is loaded in the cartridge storage chamber 2 in the normal position, and when the back cover 3 is closed by the spring 9, the cartridge storage chamber It is energized so that it is biased towards the 2nd side.

FIG. 6 shows another embodiment in which the cartridge correction mechanism 5 is replaced by the cartridge opening correction plate 7.
and a belt-shaped sheet 10 connected to the tip of the correction plate 7.

The sheet 10 is made of a material with a high coefficient of friction that can wrap around and contact approximately the lower half of the cartridge 8 loaded in the cartridge storage chamber 2,
When the cartridge 8 is loaded, its lower half is interposed between the inner wall surface of the cartridge storage chamber 2 and the cartridge 8, and as the back cover 3 is closed, the cartridge 8 is gradually pulled up.
It is designed to give rotation in the direction of the arrow.

The spool 12 for automatically winding up the film F applied to the illustrated embodiment has the following structure. That is, a film winding chamber 13 is provided on the opposite side of the cartridge storage chamber 2 of the camera body 1.
A vane plate 15,1 having an arc-shaped cross section similar to the circumferential surface of the spool shaft 14 mounted therein along the axial direction.
The base of the film F is pivoted, and the spool 12 rotates in the direction in which the base advances, thereby winding the film F.

The blades 15, 15 are provided with springs 16, 15, so that their free ends float a predetermined amount above the circumferential surface of the spool shaft 14.
16, and these wing plates 15, 15
Protrusions 17, 17 which can be engaged with the perforation of the film F are respectively provided on the outer surface of the free end thereof. The vanes 15, 15 are pushed when the film F is wound around the spool shaft 14.
A substantially cylindrical spool 12 is configured so as to be in close contact with the circumferential surface of the spool.

When the sprocket 18 for feeding the film F is provided on only one side, upper or lower, as shown in the first figure, the protrusions 17, 17 are provided on the perforation side that engages with the sprocket 18. It is desirable to provide one. Further, the wing plates 15, 15 may be two symmetrically provided, or may be one or two or more, and their structure may be supported by a shaft, or the base may be fixed using a plate spring-like member. .

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

Drop the cartridge 8 into the cartridge storage chamber 2 of the camera body 1 in a predetermined direction, guide the leading end of the film F pulled out from the film outlet 8a toward the spool 12, and place it on top of it.
When the back cover 3 is closed in this manner, the tip 7a of the cartridge opening correction plate 7 of the cartridge correction mechanism 5 provided on the inner surface of the base of the back cover 3 is rotated in the closing direction of the back cover 3. 8.

If the film cartridge 8 is dropped with the film outlet 8a facing slightly upward, the tip 7a of the cartridge opening correction plate 7 will be positioned behind the film outlet 8a as shown in FIGS. 3 and 4. As the back cover 3 is rotated in the closing direction, the cartridge 8 is rotated in the direction of the arrow, and when the back cover 3 is completely closed, the film outlet 8a is in a horizontal position as shown in FIGS. 2 and 5. The film F that has been corrected and pulled out is placed in the correct position along the film gate of the camera body 1.

In the case of the embodiment shown in FIG. 6, the posture correcting action of the cartridge 8 by the cartridge opening correction plate 7 is performed in exactly the same manner as in the previous embodiment, and the cartridge is connected to the cartridge opening correction plate 7. Since the sheet 10 is pulled as the straightening plate 7 moves, the cartridge 8 is pulled by the friction so as to assist the straightening action by the cartridge opening straightening plate 7.
By rotating the cartridges in the same direction, the posture of the cartridge 8 can be corrected more reliably.

After closing the back cover 3, when the spool 12 rotates in the direction of the arrow by manual, mainspring, or electric winding operation, the spool 12 rotates in the direction of the arrow.
The blades 15, 15 of the blades 15 also rotate, and when the protrusion 17 of one blade 15 comes to the perforation position of the film F, the free end of the blade 15 is biased by the spring 16 against the inner surface of the film F. Since the film F is pressed against the spool 12, it engages with it, and the rotation of the spool 12 pulls the film F.
5 is pushed backwards by the film F and the spool shaft 1
4, and substantially becomes a part of the spool shaft 14, and the film F is wound thereon. Note that when the protrusion 17 of the other vane plate 15 comes to the perforation position, it engages with it as in the previous case,
It is also pressed by the film F and comes into close contact with the circumferential surface of the spool shaft 14, so that the entire spool 12 becomes cylindrical and the film F is wound in a perfect circle.

After the entire amount of film F has been photographed, it is rewound into the cartridge 8 in the same way as with a normal camera, and the perforation at the tip of the film F reaches the vane plate 15,
When removed from the projections 17, 17 of 15, each wing plate 1
5 and 15 are floated to a predetermined position by springs 16 and 16, and return to the initial state.

It should be noted that the automatic winding mechanism for the film F is not limited to the above embodiment, and it goes without saying that other mechanisms may be used.

As explained above, the present invention provides a cartridge correction mechanism on the inner surface of the pivot side base of the back cover of the camera,
When closing the back cover, the tip of the cartridge opening correction plate presses the back of the film outlet of the cartridge placed in the cartridge storage chamber and rotates the outlet to move it to a predetermined direction.
After loading the cartridge, the cartridge can be automatically corrected to its normal position in response to the operation of closing the back cover, and as a result, the film pulled out from the cartridge can be prevented from floating and progressing smoothly to the winding side. Incomplete loading is completely prevented, and especially when applied to a camera adopting an autoloading method, automatic winding of the leading edge of the film can be ensured, and the occurrence of film loading mistakes can be completely eliminated.

In addition, by making the cartridge correction mechanism a combination of a cartridge mouth correction plate and a sheet,
The cartridge can be rotated more reliably, and the above effect can be further enhanced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of a camera to which the present invention is applied with the back cover opened, Fig. 2 is a sectional view when the back cover is closed, and Figs. 3 to 5 show the operating state. FIG. 6 is an explanatory diagram showing another embodiment. 1...Camera body, 2...Patrone storage chamber, 3...Camera back, 5...Patrone correction mechanism, 7
...Patrone mouth correction plate, 8...Patrone,
9... Spring, 10... Sheet, 12... Spool, 13... Film take-up chamber, 14... Spool shaft, 15... Vane plate, 17... Stem, 18... Sprocket.

Claims (1)

[Claims] 1. In a camera that uses film stored in a cartridge, the base of the camera back, which is pivotally attached to the end of the camera body on the side of the cartridge storage chamber, has a
A cartridge correction mechanism is provided, which is biased and pivoted so as to bias one end of a cartridge opening correction plate capable of pushing the back of a film drawer opening of a cartridge loaded in the cartridge storage chamber to the side of the cartridge storage chamber, A film loading device for a camera, characterized in that when the back cover is closed, the free end of the cartridge opening correction plate pushes the back of the film exit of the cartridge to correct the exit into a horizontal position. .