JPS6239384Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic film loading device used in an automatic film winding camera that winds the film using a motor, spring, etc.

2. Description of the Related Art Cameras are already known in which the film is not manually wound when taking a photograph, but is automatically wound using a motor or a spring built into the camera. However, even in these cameras, loading the film onto the film winding shaft is done manually, just like in conventional manual winding cameras, and only the film winding is done automatically during subsequent shooting. Because of this, the troublesome work of loading film remains as it is.

SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a camera which can automatically wind and load film.

The automatic film loading device of the present invention is equipped with a means for automatically loading the leading edge of the film onto the film winding shaft by utilizing an automatic film feeding mechanism provided in an automatic film winding type camera. The automatic loading means eliminates the need for the photographer to carry out troublesome film loading work. That is, the film is fed along the inner wall of the film winding chamber by a film feeding sprocket onto the inner wall of a film winding chamber which houses a film winding drum rotated by a motor or the like, which has claws for perforating the film. A guide member is provided to guide the film to the circumferential surface of the film winding drum and apply perforation to the claws of the rotating film winding drum. , an urging force disposed along the loaded film, which elastically urges the film radially outward of the film winding drum so that the film is easily removed from the claws of the film winding drum when the film is rewound; A member is provided to ensure that the film can be loaded and unloaded.

When using a camera equipped with this automatic film loading device, the photographer sets the cartridge, pulls out the film a little, places the leading edge of the film on the film gate, closes the camera back cover, and then performs subsequent film feeding operations. Everything is left to the machine, making camera operation extremely easy. Furthermore, when a camera is equipped with an automatic film winding device, the winding power is often used to automate the rewinding of the film, but the automatic film loading device of the present invention Since the structure is such that the film can be reliably removed from the film winding drum, troubles will not occur during film rewinding even when used in a camera equipped with an automatic film rewinding function.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a part of a camera in which an automatic film loading device according to the present invention is used. In the film winding chamber 1, a cylindrical winding drum 2 is installed in place of the winding spool in the case of manual film winding system.
is placed thereon, and serves as a film take-up shaft that rotates in conjunction with the sprocket 3. Motor (not shown)
is installed inside the winding drum 1, and is connected to the winding drum 2 and sprocket 3 via a reduction gear (not shown).
rotate in conjunction with each other. This rotation mechanism will be explained in detail later. The circumferential surface of the winding drum 2, the film 4
A claw 6 that hangs on one of the perforations 5 is arranged at a position corresponding to the orbit of the perforation 5. The film gate part has a notch 7 in the center, and the lower part divided by this notch 7 has a slightly larger curvature than the upper part, and is made of highly elastic metal. A spring plate 8 made of a plate is provided. The winding drum 2 and spring plate 8 described above, as well as the film presser spring not shown in FIG. 1, are shown in detail in FIGS. 2 and 3. FIG. 2 is a sectional view of the film take-up chamber 1. A film presser spring 9 made of a highly elastic metal plate is provided on the opposite side of the film gate portion.
The tip of this film pressing spring 9 is connected to the winding drum 2.
is in elastic contact with the circumferential surface of the As shown in FIG. 3, this film holding spring 9 has a width from the inside of the claw 6 of the winding drum 2 to approximately the center of the winding drum 2, and presses the tongue at the leading end of the film onto the winding drum 2. It has a shape that guides it on the circumferential surface.
FIG. 4 shows the relationship between the winding drum 2 and the motor that rotates it. Motor 10 is screw 11
is fixed to the camera body (not shown) by a pinion 12, and its rotation is controlled by a reduction gear train (first stage gear 13 and final stage gear 14 in the figure).
(shown only). The reduction gear train rotates a sprocket for feeding the film and also rotates a gear 15 disposed concentrically with the shaft of the motor 10. This gear 15 rotates a drum rotating ring 16 with which it is frictionally engaged, and a pin 17 on this rotating ring 16 engages with a pin 18 provided on the winding drum 2 to rotate the winding drum 2. Here, the shape of the claw 6 provided on the circumferential surface of the winding drum 2 is shown enlarged in FIG. As shown in the figure, this claw 6 is shaped so that it only hangs over one of the perforations 5 of the film 4, so that even if the film 4 is wound twice or three times around the winding drum 2, it will not touch the perforations 5 of the film 4. It does not affect the perflation of the part.

Next, the operation of each part during film loading will be explained. The leading end of the film 4 pulled out from the cartridge 19 is placed on the spring plate 8. As mentioned above, a step is formed in the center of this spring plate 8, and the upper edge of the tongue portion of the film 4 comes into contact with the lower edge of the upper half of the spring plate 8 due to this step, so that the film 4 When the leading end is fed by the sprocket 3, it is guided into the film winding chamber 1 without being displaced inwardly. When the tongue portion of the film 4 is guided into the film winding chamber 1 in this manner, the tongue portion of the film 4 is guided onto the circumferential surface of the winding drum 2 by the action of the film pressing spring 9. The winding drum 2 is rotated at a slightly higher speed than the sprocket 3 in conjunction with the sprocket 3 that feeds the film 4, so that one of the claws 6 provided on the circumferential surface of the winding drum 2 touches the tip of the film 4. The film 4 is loaded onto the take-up drum 2 after passing through the perforation 5. In cameras equipped with an automatic film winding mechanism, the film is normally wound automatically by one frame at the same time as the shutter is released. This is done by pressing the shutter button several times after closing the shutter.

While the film 4 is being wound around the winding drum 2, the film 4 is subjected to a force in the radially outward direction of the winding drum 2 by an elastic spring plate 8 provided at the film gate portion. Winding drum 2 claw 6
As shown in FIG. 5, when the winding drum 2 is rotated in the rewinding direction, it is formed in a shape that separates from the perforation 5, but when the film is rewinded, the tongue portion of the film 4 is By receiving an outward force from the curved plate 8, the film is released from the winding drum 2 more reliably.

According to the automatic film loading device of the present invention, there is no need to carry out troublesome film loading work, and all the work related to film feeding is done by simply placing the film, and the rest is done by the machine, which is extremely easy to operate. The practical value is enormous because a simple camera will be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention;
2 is a sectional view showing the film take-up chamber of the embodiment shown in FIG. 1, FIG. 3 is a perspective view (partially cut away) showing a part of the embodiment shown in FIG. 1, and FIG. 4 is the same as that shown in FIG. 1. FIG. 5 is an enlarged sectional view of a part of the embodiment shown in FIG. 1. FIG. 1... Film winding chamber, 2... Winding drum, 6
...Tlaw, 7...Notch, 8...Spring plate, 9...
Film holding spring.

Claims (1)

[Claims for Utility Model Registration] 1. In an automatic film loading device that uses a film winding drum that is equipped with a claw for hanging film perforation and that is rotated by a motor, spring, etc., a film winding device that houses the film winding drum. A member is provided on the inner wall of the take-up chamber so as to guide the film to the circumferential surface of the film take-up drum, and the member gradually approaches the take-up drum in the film feeding direction and resiliently contacts the circumferential surface of the take-up drum. The film gate section of the film winding chamber is arranged along the film to be loaded, and the film is placed outside the diameter of the film winding drum so that the film can easily come off the claw of the film winding drum when the film is rewinded. 1. An automatic film loading device characterized by being provided with a biasing member that resiliently biases the film in the opposite direction. 2. The biasing member is made of a plate material that is divided into two parts at the center in the film feeding direction to form a step so as to guide and regulate the tongue portion at the leading end of the film to a predetermined vertical position when loading the film. An automatic film loading device according to claim 1 of the utility model registration claim.