JPH02154245A - Camera - Google Patents

Abstract

PURPOSE:To stabilize a cartridge position and to improve film drawing performance by providing a cartridge positioning projecting part on the inner wall of a cartridge loading chamber. CONSTITUTION:The subject camera is provided with a plastic cartridge loading chamber having facing side walls whose the periphery is formed in a non- circular shape on both edges of a chamber barrel part. The cartridge loading chamber 2 is formed in a curved shape correspondingly to the shape of the outer periphery on the side 9b of the side wall 9 of the cartridge 3. The projecting part 13 provided on the inner wall of the cartridge loading chamber 2 suppresses playing even if there are burrs and sinks on the outer edge of the side walls 9 and 9 of the cartridge 3 and is provided with a right positioning function that is, a function which surely fixes the play of the cartridge 3 in a peripheral direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera compatible with a plastic cartridge.

[Conventional technology]

The cartridge (container for storing bare roll film) commonly used in -a has a body formed by rolling up a metal body plate so that the part to which the light-shielding cloth is attached faces in a lip shape, and the bare film is placed inside the body. After storing the wound spool, flat plate-shaped metal caps (which also serve as bearings for the ends of the spool) are attached to both ends of the body.
(side wall) is fixed. Therefore, since the side wall is limited to a circular shape in nature, it is impossible to maintain a constant orientation during loading into a camera unless the film outlet is protruded in the form of a lip. In response to this, a cartridge has recently been proposed in which the body and side walls are molded from plastic. This plastic cartridge has the outer edge of the side wall protruding from the body and can be made non-circular, so the shape of the camera side made by the inner wall of the cartridge loading chamber and the camera back should match (correspond) to that shape. If so, the film outlet has the advantage of not having a lip-shaped protrusion (but it is possible to maintain a constant orientation during loading).

[Problem to be solved by the invention]

However, during plastic molding, dimensional accuracy tends to vary due to cracks and sink marks on the outer edge of the side wall, and therefore,
Even if the shape of the camera side was designed to accommodate this, in reality, it could become too bright or loose, making the camera's posture unstable. The posture of the cartridge in the cartridge loading chamber affects the winding load. If the posture is incorrect, the winding lever of a manual winding camera will be difficult to operate and the feeling when winding will be poor, while an automatic winding camera will have a poor feel when winding the film. There was a risk that the hoisting torque would be insufficient and hoisting would become impossible.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a camera that can always stably hold a cartridge in a correct posture in a cartridge loading chamber.

[Means to solve the problem]

To achieve the above object, the present invention provides a camera equipped with a loading chamber for a plastic cartridge having opposing side walls with non-circular outer edges formed at both ends of the body, wherein a positioning ridge for the cartridge is provided on an inner wall of the cartridge loading chamber. The film is constructed so as to improve the film drawing performance by providing a section and stabilizing the posture of the cartridge.

〔Example〕

Next, the present invention will be described based on embodiments shown in the accompanying drawings.

In FIG. 1, 1 is a camera body, 2 is a cartridge loading chamber, 3 is a plastic cartridge, 4 is a sprocket that engages with the perforations of film F, 5 is a take-up reel, and 6 is a back cover.

The plastic cartridge 3 has opposing side walls 9°9 having bearing holes 8 for bearing both ends of the spool 7, and the side walls 9.
, 9 and a body 11 having a film outlet 10 between them. The opposite side wall 9.9 protrudes at its outer edge 9' from the body 11 and is non-circular. That is, the cut on the side of the film outlet 10 is a square shape 9a, and the other cut has a circular arc 9b. Also, plastic cartridge 3
can be split into two from a diagonal line 12 passing through the center of the bearing hole 8 in order to facilitate storage and removal of the spool 7 on which the film is wound.

The cartridge loading chamber 2 is formed into a curved shape as shown in the second figure in accordance with the shape of the outer periphery of the side wall 9 of the cartridge 3 on the arc 9b side. That is, the cartridge 3 has its arc 9b
If the back cover 6 is loaded with the side facing directly in front of the cartridge loading chamber 2 as shown by the arrow, the back cover 6 will be properly closed as shown in the third figure, but if it is loaded sideways or backwards (square 9a
(with the side directly facing the cartridge loading chamber 2), the cartridge cannot be loaded or the back cover 6 cannot be closed.

Reference numeral 13 denotes a positioning protuberance provided on the inner wall of the cartridge loading chamber 2 and abutting a plurality of locations (not limited to four locations in the figure) on the outer edge of the side wall 9.9 of the cartridge 3. Department.

This raised portion 13 has the function of suppressing rattling and maintaining the correct posture even if there are cracks or sink marks on the outer edges of the side walls 9, 9 of the cartridge 3 loaded in the cartridge loading chamber 2.
That is, it has a function that can securely fix the play in the circumferential direction of the cartridge 3.

In the illustrated embodiment, the raised portion 13 is located in the cartridge loading chamber 2.
Although the buttons are provided vertically on the inner wall of the cartridge 3 in the shape of a button, they may be provided in the shape of a button at a portion corresponding to the outer edge of the side wall 9 of the cartridge 3. Alternatively, a protrusion 14 may be provided on the outer edge of the cartridge side wall 9 as shown in the figure so as to contact the protrusion 13.
The projections 14 contribute to further improving the posture stability of the cartridge 3.

In the figure, 15 is an exposure frame, 16 is a shutter button, 17 is a viewfinder, 18 is a lock release knob for a hook 19 provided on the back cover 6, and 20 is a cartridge storage confirmation window.

In the above embodiment, when loading cartridge 3,
First, the cartridge is loaded with the arc 9b side facing directly in front of the cartridge loading chamber 2. Next, the leading end of the film F pulled out from the cartridge 3 is connected to the take-up reel 56, and the back cover 6 is closed. As a result, the cartridge 3 comes into close contact with the raised portion 13 provided on the inner wall surface of the cartridge loading chamber 2 as shown in the third figure, so that it is stably held in the correct posture.

[Effects of the Invention] As described above, the present invention provides a camera equipped with a loading chamber for a plastic cartridge having opposing side walls with non-circular outer edges at both ends of the body. Since it is characterized by the provision of a positioning protrusion, the cartridge loaded in the cartridge loading chamber is always maintained in the correct position by closing the back cover. Therefore, the posture of the cartridge does not change during photographing, and the hoisting load does not become abnormally heavy. For this reason, manual winding type cameras have a good feel when operating the winding lever (automatic winding type cameras have various advantages such as being unable to wind due to insufficient torque). It has the following effects.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is an illustrative perspective view, Fig. 2 is a diagram showing the shape of the cartridge loading chamber and the side wall of the cartridge, and Fig. 3 is a diagram showing a case where a cartridge is loaded in the cartridge loading chamber and the camera back is covered. FIG. ■--Camera body 2--Patrone loading chamber 3...Plastic cartridge 9...-Side wall 9.9 having a film outlet 10 between them
a-Square 9b...Circular trunk raised part

Claims (1)

[Claims] A camera equipped with a loading chamber for a plastic cartridge having opposing side walls with non-circular outer edges at both ends of the body, characterized in that a protrusion for positioning the cartridge is provided on an inner wall of the cartridge loading chamber. .