JPH0442827Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an automatic film loading mechanism for a camera, and more particularly to an automatic film loading mechanism that allows the film to be started to be wound onto a spool shaft without failure.

(Prior art) In recent years, cameras have become more automated, and when it comes to loading film, it is now possible to automatically spool the film by simply pulling out a predetermined length of film from the cartridge, placing it in a predetermined position inside the camera, and closing the rear cover. An automatic film loading mechanism for winding onto a shaft has been proposed and commercialized.

This conventional film automatic loading mechanism will be explained with reference to FIG.

Pull out the partially exposed film 5 to a position corresponding to the roller 9 of the guide member 8 provided on the rear lid 3,
When the rear lid 3 begins to close, the film 5 is pressed against the photographing opening by the pressure plate 7, and the film 5 is further pressed against the photographing opening.
The tip of is pressed against the spool shaft 4 by a roller 9. When the rear lid 3 is completely closed in this state,
When a switch (not shown) is closed, the drive mechanism is driven, and the spool shaft 4 begins to rotate.
When the hook 6 on the spool shaft 4 comes close to the roller 9, the hook 6 engages with the perforation 5a of the film 5 pressed against the spool shaft 4 by the roller 9, and the film 5 is spooled. Start winding along axis 4. Before the leading edge of the film is wound once around the spool shaft 4, the leading end of the film is again pressed against the spool shaft 4 by the roller 11 of the guide member 10 provided in the camera body 1, in preparation for the second roll.

However, such conventional film automatic loading mechanisms have the following problems. In other words, if the film is wound around the spool shaft 4 with even a slight inclination, the perforation of the film will change when the leading end of the film 5 comes into contact with the film located in front of the spool shaft 4 as shown in FIG. 5a, and if the winding operation was continued in this state, the perforation 5a of the film 5 and the hooking pawl 6 would disengage.

SUMMARY OF THE PRESENT APPLICATION The present application has been made in consideration of the above-mentioned problems in the prior art, and has as its object to provide an automatic film loading mechanism for a camera that is simple in construction and does not fail.

(Summary) The automatic film loading mechanism of the camera of the present application has a spool shaft for winding the film, at least a portion of which corresponds to the leading end of the film, formed of a plurality of columnar members arranged in parallel on the circumference. is designed to fit into the gap between the columnar members.

(Example) Next, an example of the present application will be described with reference to FIGS. 3 and 4.

FIG. 3 is a cross-sectional view showing the vicinity of the film winding chamber of the camera. A substantially cylindrical film winding chamber 2 is formed in the camera body 1, and the rear side of the camera is wide open. Furthermore, a rear cover 3 is provided on the back of the camera so that it can be opened and closed using a well-known hinge mechanism.
Thereafter, when the lid 3 is closed, a portion thereof covers the opening of the film winding chamber 2, and together with the peripheral surface 1a of the film winding chamber 2 of the camera body 1, forms a side wall of the film winding chamber. A spool shaft 40 connected to a drive mechanism (not shown) is located approximately at the center of the spool chamber 2.
is installed. As shown in FIG. 4, this spool shaft 40 includes a cylindrical spool shaft lower part 41 and four cylindrical members 42 erected on the circumference of the upper surface thereof.
The spool shaft upper part 42 consists of a, 42b, 42c, and 42d. and one of them
A hook 44 is fixedly attached to the cylindrical member 42a of the book so as to face outward. A ring-shaped joining member 45 is fixed to the upper surface of the spool shaft upper part 42 , and is rotatably fitted into a recess provided in the camera body 1. The camera rear lid 3 is provided with a pressure plate 7 for lightly pressing the film 5 against the photographing opening provided in the camera body 1, and a guide member 8 for guiding the film 5 separated from the pressure plate 7 into the film winding chamber 2. There is. The guide member 8 has a flat plate shape and is rotatably supported by the rear lid 3, and has a rotatable roller 9 at its tip. A torsion spring 20 is inserted between the guide member 8 and the rear cover 3, and the roller 9 is connected to the spool shaft 40.
It is pressed across the upper part 42 and lower part 41 of. A guide member 10 similar to the guide member 8 described above is also provided on the wall surface of the film winding chamber 2 on the photographing opening side.
supports a roller 11 at its tip, and a torsion spring 12
is biased toward the spool axis 40 by the spool shaft 40.

In the automatic film loading mechanism of the present invention thus constructed, when the film 5 is loaded and the rear cover 3 is closed, the spool shaft 40 begins to rotate in the direction of arrow a in FIG. 3 by a drive mechanism (not shown). When the hook 44 provided on the cylindrical member 42a of the spool shaft upper part 42 engages with the perforation 5a of the film 5, the film 5 is moved to the guide member 8.
It is wound around the spool shaft 40 while being guided by. The leading end of the film 5 is pressed again against the spool shaft 40 by the roller 11 of the guide member 10 before being wound approximately once. Therefore, the leading end of the film is connected to the cylindrical member 42b and the adjacent 42b.
It enters the gap between c and c and is wound without coming into contact with the newly pulled out film. When a predetermined amount of film 5 has been wound around the spool shaft 4, the drive mechanism is stopped by a known stopping means, making it possible to take pictures.

(Effects) In the automatic film loading mechanism of the camera of the present application configured as described above, the tip of the film wound around the spool shaft is configured to slip into the spool shaft, so that perflation and hooking are prevented. It is possible to obtain an automatic film loading mechanism for a camera that allows reliable loading without fear of disengagement with the claw.

In the embodiment, the upper part of the spool shaft is made up of four columnar members, but the present application is not limited to this; it is sufficient that the film is wound and its tip enters the gap between the two columnar members; Can be changed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the area around the film winding chamber of a conventional camera, FIG. 2 is a perspective view showing the winding state of the film in the conventional camera, and FIG. FIG. 4 is a cross-sectional view showing the spool shaft and its surroundings, and is a perspective view showing the spool shaft in the above embodiment. 2... Film winding chamber, 4, 40... Spool shaft, 6, 44... Hook claw, 42a, 42b, 42
c, 42d...Cylindrical member.

Claims (1)

[Scope of Claim for Utility Model Registration] A spool shaft rotatably provided in a film winding chamber, and a spool shaft provided at a portion of the spool shaft where at least the leading end of the film is wound around the center of rotation of the spool shaft. a plurality of columnar members arranged in parallel at predetermined intervals; an engaging pawl provided on at least one of the plurality of columnar members and engaged with a perforation at a leading end of the film; The film is placed on the inner wall of the take-up chamber so as to be biased toward the spool shaft, and the film inserted into the film take-up chamber comes into contact with the columnar member at a position where it comes into contact with the spool shaft. a first guide member for pressing the film onto the spool shaft; and a first guide member disposed on the inner wall of the film take-up chamber so as to be biased toward the spool shaft, the film being wound around the spool shaft for one rotation. a second guide member that abuts the columnar member of the spool shaft at a position immediately before the film is moved, and presses the leading end of the film into the gap between the columnar members. Loading mechanism.