JPS6289028A - Film feed confirming device for camera - Google Patents

Abstract

PURPOSE:To improve efficiency of film winding, to prevent lowering of winding and to miniaturize a camera by providing a rotary body for confirming feed at a specified position on a back cover and changing the position of a roller spring contacting a film with increase of winding diameter of a spool. CONSTITUTION:When a film F is wound on a spool 12, a roller 23 that brings spring into contact with the film rotates, and a transmitting roller 19 and a feed confirming shaft 18 rotate with it. The rotation is visible through a confirming window 15 and thereby the winding of the film is confirmed. When the winding diameter becomes large with advance of winding, the roller 23 retreats to the back cover 14 side. At this time, an oscillating arm 20 retreats and rotates in the direction of the back cover, and accordingly, the film F is fed to the spool 12 without bending. Therefore, the friction between the film F and the roller 23 is reduced and the film is wound smoothly, and the efficiency of winding is enhanced, and at the same time, a fixed winding speed can be maintained. Further, the frontal feeding of the film F to the spool 12 ensures flatness of a screen in the film F to the face of a rail of the body 11.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an improvement in a film feed confirmation device for a motor-driven automatic film feed camera.

"Prior Art and its Problems" Conventionally, there is no device that checks film feeding by bringing a rotating member into contact with the film and mechanically checking the movement of this rotating member as the film is fed from outside the camera. Many are known. FIG. 4 shows a typical example. A film feed confirmation roller 4 is rotatably supported at a predetermined position on the bottom plate hill of the camera body l in correspondence with the confirmation window 3 of the rear cover 2, and this roller 4 is wound onto a spool 5. It is in close contact with film 6. When the film 6 is wound up by the drive rotation of the spool 5, the feed confirmation roller 4 which is in elastic contact with the film 6 rotates, and by visually observing the rotation through the confirmation window 3 of the rear lid 2, the film 6 is fed. You can confirm that it has been sent.

However, in this conventional device, since the feed confirmation roller 4 is in a fixed position on the camera body 1, as the winding of the film 6 progresses and the diameter of the spool 5 increases, the contact portion of the feed confirmation roller 4 increases accordingly. The curvature of the film 6 in the vicinity of A becomes unpleasant, which causes a deterioration in the winding efficiency of the spool 5 and further a decrease in the winding speed.

In addition, in order to downsize the camera, if the diameter of the spool 5 is made small and the distance between the center 0 of the spool 5 and the wall 7 of the main body 1 is shortened, when the film is loaded N, the main body of the film 6 is The angle of incidence from the rail surface of 1 to the spool 5 is 0
becomes steep, and this incident angle θ does not change even when the film is rolled up, so depending on the installation position of the feed confirmation roller 4, it may have a negative effect on maintaining the flatness of the screen of the film 6 with respect to the rail surface of the main body l. Become.

``Object of the Invention'' The present invention has been made to solve the above-mentioned technical problems, and aims to improve film winding efficiency and prevent a decrease in winding speed. It is an object of the present invention to provide a film feed confirmation device that maintains the flatness of the camera and can further downsize the camera.

"Summary of the Invention" The present invention provides a film feeding confirmation rotating body provided on the inner surface of the rear lid and a film elastic contact roller that actually makes elastic contact with the film and rotates as the film is fed. This was created based on the idea of moving the contact roller toward the back cover as the film advances, and there is a film feed confirmation rotating body on the inner surface of the rear cover whose rotation can be visually observed from outside the rear cover. At the same time, a swinging arm is pivotally mounted coaxially with this film feed confirmation rotating body, and a film elastic roller that rotates in conjunction with the film feed confirmation rotating body is supported at the tip of this swinging arm. , and the AT arm of the Saranico is oscillated in the direction in which its film l511I contact roller comes into elastic contact with the feeding film. According to this configuration, as the spool diameter increases as the film is fed, the swinging arm swings back, making it possible to feed the film almost linearly toward the spool even if the spool diameter changes. can.

"Embodiment of the Invention" An embodiment of the present invention will be described below in detail based on the drawings.
In the figure, 11 is the main body of the camera, and 12 is a spool for winding up the film F, which is rotationally driven in the winding direction by a motor (not shown).

Reference numeral 13 denotes a pressure plate provided on the back ML4 that can be opened and closed with respect to the camera body 1, and holds the film F at the time of back loading between it and the rail surface of the body 11. A confirmation window 15 is bored in the rear cover 14, and a transparent plate is attached to the confirmation window 15 to maintain its aesthetic appearance.

A light shielding member 16 is attached to the inside of the rear lid 14, and an opening 17 thereof faces the confirmation window 15. The light shielding member 16 also serves as a bearing that rotatably supports a vertical feeding confirmation shaft (film feeding confirmation rotating body) 18, and a transmission roller 19 is coaxially fixed to the upper end of the feeding confirmation shaft 18. The feeding confirmation shaft 18 has its feeding confirmation portion P covered by a light shielding member 16 so that light passing through the confirmation window 15 does not reach the inside of the camera. This feeding confirmation part P is
The rotation can be confirmed at a glance by a process such as a striped pattern.

A swing arm 20.20 is pivotally mounted on the feeding confirmation shaft 18 coaxially with the feed confirmation shaft 18 and positioned above it. The swing arms 20.20 are integrated by a connecting plate 21 and rotate simultaneously at all times. This swinging arm 20 has stow/bars 20a and 20b that can be engaged with the back cover 14 at both ends thereof, thereby restricting both ends of the swinging arm 20 toward the back cover 14 side. .

This swing arm 20 has a roller shaft 22 at its free end.
is fixed, and a film elastic contact roller 23 that frictionally engages with the transmission roller 19 is rotatably attached to the upper end of this roller shaft 22. Therefore, as the film elastic contact roller 23 rotates, the transmission roller 19, that is, the feeding confirmation shaft 18, rotates in conjunction with the rotation. The swinging arm 20 is moved inward by a compression torsion spring 24 inserted on the outer periphery of the feeding confirmation shaft 18 between the light shielding member 16 and the lower swinging arm 2o, that is, the film elastic contact roller 22
is biased to swing in the direction of elastic contact with the film F. The biasing force of the compression torsion spring 24 is set so that even if the winding diameter of the film F with respect to the spool 12 changes, the film elastic contact roller 23 always contacts the film F with a load that does not cause it to bend. There is. Also, the swinging arm 1
．． The end of rotation by the compression torsion springs 20 is restricted at a position where one of the stops/pas 20a abuts against the back cover 14.

The present invention will be explained in detail below.

When the spool 12 is rotationally driven by a motor (not shown) and the film F is wound around the spool 12,
The film elastic contact roller 23 that is in elastic contact with the film F rotates due to the biasing force of the compression torsion spring 24, and as a result, the transmission roller 19 that is in frictional engagement with the film elastic contact roller 23 and its body are rotated. The feed confirmation shaft 18 rotates.

The feeding confirmation portion P of the feeding confirmation shaft 18 is shielded from light by the light shielding member 16, and its rotation can be visually observed through the confirmation window 15, so that it can be confirmed that the film F is being wound.

Film F is sequentially wound onto spool 12, and spool 1
When the winding diameter of 2 becomes thicker, the film elastic contact roller 23, which is always in elastic contact with the film F, retreats toward the subsequent film 14. That is, after the swinging arm 2o resists the old force of the compression torsion spring 24 around the feeding confirmation shaft 18, it moves in the 414 direction (
It gradually rotates backward in the direction of the arrow in Fig. 3). Due to this backward rotation of the swing arm 20, the film F that comes into contact with the rotor 23 is not bent.

It is fed almost linearly toward the spool 12. Therefore, the film F is smoothly wound up by the spool 12 due to reduced friction with the film elastic contact roller 23, and the winding efficiency of the spool 12 is improved and a constant winding speed can be maintained. Further, the linear feeding of the film F to the spool 12 is performed by the main body 1.
This ensures the flatness of the screen of the film F with respect to the rail surface of the film F. Then, the film elastic contact roller 23 is
As described above, it continues to rotate backward while making elastic contact with the film F depending on the feeding state of the film F, and the end of the rotation is regulated by the stopper 20b coming into contact with the inside of the rear lid 14.

"Effects of the Invention" As explained above, according to the present invention, a feeding confirmation rotating body for confirming film feeding is provided at a fixed position on the rear cover,
The film elastic contact roller, which rotates as the film rotates in elastic contact with the film, changes its position as the spool winding diameter increases, so the film elastic contact roller acts as a resistance to winding the film, or There is no possibility of bending the film. Therefore, the winding efficiency of the film by the spool is improved, and a decrease in the winding speed can be prevented. Furthermore, since the film can be constantly fed linearly toward the spool, the flatness of the film with respect to the rail surface of the main body is maintained. Furthermore, since there is a degree of freedom in setting the position of the feeding confirmation rotating body, it is possible to downsize the camera.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an outline of an embodiment of the film feeding confirmation device according to the present invention, FIGS. 2 and 3 are plan views of FIG. 1, and FIG. 2 is a state diagram when loading a film; FIG. 3 is a state diagram when film winding progresses and the spool diameter becomes thicker, and FIG. 4 is a schematic plan view showing an example of a conventional film feeding confirmation device. 11... Main body, 12... Spool, ■4... Rear cover, 15... Confirmation window, 16... Light shielding member, 18...
Feeding confirmation shaft (film feeding confirmation rotating body), 22... Roller shaft, 19... Transmission roller, 20... Swinging arm, 23... Film elastic contact roller, 24... Compression torsion Spring, F...Film, P...Feeding confirmation part. Patent applicant: Asahi Optical Industry Co., Ltd. Agent: Kunio Miura Shigeru Matsui Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) A film feed confirmation rotating body whose rotation can be visually observed from the outside of the rear cover is supported on the inner surface of the rear cover that is supported by the camera body so as to be openable and closable, and is coaxial with the film feed confirmation rotation body. A swinging arm is pivotally mounted, and the tip of the swinging arm supports a film elastic roller that rotates in conjunction with the film feeding confirmation rotating body, and the film elastic roller feeds the swinging arm. A film feed confirmation device for a camera, characterized in that a spring means is provided for swinging and biasing in a direction to come into elastic contact with the feed film.