JPS61240232A - Auto load camera - Google Patents

Abstract

PURPOSE:To feed a film by winding it exactly to a winding reel at all times, by providing an elastic guide member on the tip part of the rear cover, and also forming an auxiliary guide wall having a recessed part for its recess, and having the almost same curved shape as the inner wall of a film winding chamber which has been formed in a camera body. CONSTITUTION:A film winding chamber 11 is provided in the vicinity of the tip part of a camera body 10, and in its inside, a film winding shaft 12 and a freely turnable guide roller 13 which is always contacting by pressure to said shaft are contained. In the inside of a rear cover 20, a middle frame 22 is attached and fixed, and to its inner surface, a spring member which supports both a guide roller 24 and a pressure welding roller 25 being an elastic guide member so as to be freely turnable is attached, so as to become a state that it has been welded by pressure to the peripheral surface of the film winding shaft 12 by an elastic action. In the tip part of the middle frame 22, an auxiliary guide wall 27 having a curved shape by the same radius of curvature as the inner wall of the film winding chamber 11 is formed as one body. The auxiliary guide wall 27 consists of a curved surface part 27a corresponding to the overall width of a film, and a curved surface part 27b and 27c corresponding to only both side edges of the film, and a recessed part 28 is provided as a saving space of the guide roller 25.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides three improvements to the initial film autoload function.
This is about the auto road camera I went to.

[Conventional technology]

In an autoloading camera, when you pull out a film from a loaded cartridge, place the leading edge of the film on the film take-up reel, and close the back cover to wind the film, the leading edge of the film automatically rolls up. It is arranged so that it can be wound around a take-up reel and fed the film.

The film take-up reel of such a camera uses a reel coated with a soft rubber material that has a high frictional force, and by roughly closing the back cover, the pressure roller provided on the back cover is pressed against the circumferential surface of the reel. The structure is such that the film is sandwiched by elastic pressure contact, and the film is rolled up by the rotation of the reel.

[Problem that the invention seeks to solve]

Generally, the position where the pressure roller presses the film against the reel is the position where the film is slightly spring-loaded along the surface of the reel. Bias can be applied.

However, if the rigidity of the film is particularly strong, the pressing force of the pressure roller is insufficient, and the leading edge of the film does not wind along the curve of the reel, but instead travels straight and is fed toward the wall of the camera body. Sometimes.

In such a case, the film will not be wound onto the reel but will be pushed into a corner of the film winding chamber, so that winding will soon become impossible and the film will have to be loaded again.

On the other hand, the pressure roller's pressure force tends to gradually increase as the reel diameter increases due to film winding, but even when the pressure force reaches its maximum, it remains within a range that does not damage the film surface. As a result, it is not possible to particularly strengthen the contact force of the pressure roller in its initial position.

The present invention solves this problem and improves it, thereby providing an autoloading camera that can always accurately wind the film around the film take-up reel and feed the film without increasing the pressure force of the pressure roller. The purpose is to

[Means for solving problems]

The above object is an autoloading camera having an elastic guide member for guiding the film to a film winding shaft, in which the film winding shaft is disposed on the side of the back cover opening/closing member, and the elastic guide member is provided at the tip of the back cover. and an auxiliary guide wall having four parts at the tip of the back cover for escape of the elastic guide member and having a curved shape substantially the same as the inner wall of the film winding chamber formed in the camera body. This is achieved by the featured autoloading camera.

〔Example〕

An embodiment of the invention is shown in FIGS. 1 and 2.

Figure 1 shows the structure of the film winding shaft side of the autoloading camera of the present invention in a horizontal cross section on the optical axis.
The figure shows the inner surface of the camera back in that position.

The camera body 10 and the back cover are hinged at one end (not shown), and when the back cover is rotated clockwise and closed, a hook member 21 formed at the tip of the camera body 10 is attached to the tip of the camera body 10. Back cover opening/closing member provided in the section (not shown)
is in an engaged state.

A film winding chamber 1 is provided near the tip of the camera body 10.
1 is provided, and a film winding shaft 12 is provided inside the film winding shaft 12.
A rotatable guide roach 13 that is in constant pressure contact with the film winding shaft 12 is housed therein.

The film winding shaft 12 is rotated clockwise by power applied to the winding mechanism of the camera together with a sprocket gear 14 disposed near the screen frame to feed and wind the film. As is well known, the film winding shaft 12 is driven through a friction device so that, together with the sprocket gear 14, the film winding shaft 12 always winds up the film equivalent to one screen.

Further, the inner wall of the film winding chamber 11 is formed by an arc concentric with the film winding shaft 12, and is formed as a member that supports the guide roller 13 at a position approximately halfway around the film winding shaft 12. A slope portion 15 is located thereon.

On the other hand, a middle frame ρ is fixedly attached inside the back M20, and a spring member n, which rotatably supports both a guide roller and a pressure roller 25t serving as an elastic guide member, is attached to its inner surface. , the guide roller 6 is arranged at a predetermined position corresponding to the sprocket gear 14 provided in the camera body 10, and the pressure roller 6 is pressed against the circumferential surface of the film winding shaft 12 by the elastic action of the spring member B. The situation is as follows.

That is, the guide roller U prevents the film fed by the sprocket gear 14 from floating up and separating from the sprocket gear 14, while the pressure roller 5 prevents the film fed by the sprocket gear 14 from floating away from the axis of the film winding shaft 12. It is located slightly to the right and acts to make the leading edge of the film fit into the circumferential surface of the film winding shaft 12.

Furthermore, in the present invention, an auxiliary guide wall n having a curved shape with the same radius of curvature as the inner wall of the film winding chamber 11 is integrally formed at the tip of the middle frame B.

The auxiliary guide wall γ has a curved surface portion 27a corresponding to the entire width of the film, and a curved surface portion 2 corresponding only to both side edges of the film.
7b and 27c, and the curved surface portions 27b and 2
Between 70 and 70, a four-part space is provided as a retreat space for the guide roller 5 when the film winding progresses.

Note that the auxiliary guide wall γ also serves as a light shielding member that more completely prevents light leakage from the back cover opening/closing member side.

According to the autoload camera configured in this way, even if the loaded film is highly rigid and the guide roller 5 is flipped up to the position shown by the dashed-dotted line when the back cover I is closed, The leading edge F of the film does not come into contact with the vertical wall surface of the film winding chamber 11, but is turned downward along the auxiliary guide wall, and the film winding chamber 11
After turning along the inner wall of the film, it comes into contact with the slope portion 15 and is guided by the shoulder surface of the film winding shaft 12 to complete winding.

It should be noted that the radius of curvature of the auxiliary guide wall n is as small as possible to be effective, so the radius of curvature is slightly spaced apart from the maximum outer diameter dimension of the film wound around the film winding shaft 12, that is, the radius of curvature is conventionally determined. It is desirable that the radius of curvature be the same as that of the inner wall of the film take-up chamber 11.

In this way, the autoloading camera of the present invention can safely handle films with strong curls or films with high rigidity, which previously caused many problems, by simply adding an auxiliary guide wall.
This enables reliable automatic loading.

〔Effect of the invention〕

According to the present invention, an autoloading camera is provided which can load film reliably at low cost without adding any special members.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of an auto road camera according to the present invention. Figure 2 is a plan view of the back cover of the camera. 10...Camera body 11...Film winding chamber 12...Film winding shaft 13...(Camera body side) Guide roller 14.
... Sprout four-kett gear 15 ... Slanted part prisoner ... Back cover η ... Middle frame Z ... Spring member

Claims (1)

[Claims] In an autoloading camera that has an elastic guide member that guides the film on a film winding shaft, the film winding shaft is disposed on the back cover opening/closing member side, so that the elastic guide member is provided at the tip of the back cover, and the back cover An autoloader characterized in that an auxiliary guide wall is formed at its tip, which has a recess for escape of the elastic guide member, and has a curved shape that is almost the same as the inner wall of a film winding chamber formed in the camera body. camera.