JPS6239369Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention particularly relates to a rewinding device for a 35 mm roll film camera.

In conventional rewinding devices, the fork part of the rewinding shaft engages with the reel of the film cartridge even when the film is fed into the shooting position, so the rewinding shaft also rotates integrally whenever the film is transported. It is designed to do so. However, when rewinding such a device, if you inadvertently remove your hand from the rewinding nozzle or crank, the knob or crank will instantly reverse due to the release behavior of the partially elastic film. Since the film must be rotated and rewinded again by itself to cover the amount of unrolled film, a device is installed that creates frictional resistance on the unwinding shaft and its guide cylinder to prevent it from rotating easily in reverse. At times, the film winding lever was always stuck, making it impossible to take pictures quickly.

In order to eliminate the above-mentioned drawbacks, the present invention is designed to remove the load during film transport by pulling up the fork portion of the rewinding shaft that engages with the reel of the film cassette when transporting the film.
The fork portion is engaged with the film cartridge shaft only during rewinding.

Examples will be described below based on the drawings.

1 to 3 show various positions of the rewinding device.

Reference numeral 1 denotes a shelf board made of die-cast camera body, and a decorative lid 2 is provided on the upper part of this shelf board. A guide tube 3 is vertically fixed between the shelf board 1 and the decorative lid 2. This guide tube has two different inner diameters, the upper inner diameter is narrower than the lower inner diameter, and a part of the upper inner diameter has a slit-like notch 4 so as to be continuous with the outer wall. is penetrated.

A notch 5 is provided in a part of the lower inner diameter and is penetrated toward the outer wall.

An inner cylinder 6 is rotatably and slidably provided at the lower inner diameter part of the guide cylinder 3, and a fork part 7 that engages with a reel of a film cassette is integrally formed at the lower end of the cylinder. . Furthermore, three steps are formed on the outer wall of the cylinder (see Fig. 4), and the first step 8
The diameter gradually decreases from the second stage 9 to the third stage 10 as it reaches the fork part 7. In particular, the step part of the second stage 9 is shaped like an ellipse, and the major diameter part is the diameter of the first stage 8, and the minor diameter part is the diameter of the first stage 8. 3
It is formed to have the same diameter as the step 10. When the upper surface of the fork portion 7 of the same cylinder butts against the lower end surface of the guide cylinder 3, this stepped portion is formed.
It is formed at a position that substantially coincides with the notch 5 of the guide tube 3. In addition, a shelf board 11 is integrally formed in the middle of the inner diameter part of the inner cylinder 6, and an oval-shaped hole 12 is provided at the lower part of the board 11, and the shelf board 11 is penetrated so as to communicate with the upper hole 13. A hole 14 is provided. The upper small diameter part of the guide tube 3 and the shelf board 1
A rewinding shaft 15 is rotatably provided through the through hole 14 of 1, and a rewinding knob 16 is screwed onto the upper end of the shaft and projects above the decorative lid 2. Further, a V-shaped groove 17 is provided along the circumferential surface at a position where the coaxial shaft fits into the small diameter portion of the guide tube 3 and a position that substantially coincides with the slit-like notch 4 of the guide tube 3, and a ring-shaped spring 18 is provided.
A part of it passes through the notch 4 and comes into contact with the V-shaped groove 17,
The other portion is adapted to apply friction to the unwinding shaft 15 by engaging the portion of the notch 4 that does not pass through. Further, a connecting plate 19 having the same shape as the oval hole 12 of the inner cylinder 6 is screwed onto the lower end of the coaxial shaft 15 and is provided to transmit the rotation of the coaxial shaft 15 to the inner cylinder 6. A coil spring 20 is interposed between the coaxial shaft 15 and the upper surface of the shelf plate 11 of the inner cylinder 6, giving a habit of always pushing the inner cylinder 6 downward. A blocking lever 21 that prevents the downward pushing behavior of the inner cylinder 6
is rotatably provided on the shelf board 1 of the camera body, and a spring (not shown) is applied so as to always press against the stepped portion of the inner cylinder 6. The action will be explained below.

FIG. 1 shows the position of the film rewinding device while the film is being transferred to the photographing position. At this point, the fork portion 7 of the inner tube 6 is pulled up and out of the reel of the film cassette, so that less force is required to wind the film. At this time, the blocking lever 21 is located at the second step 9 of the stepped portion formed in the inner cylinder 6.
Since it is located between the short diameter part and the long diameter part (FIG. 6), the wall surface perpendicular to the first stage 8 contacts the lever 21 and prevents the cylinder 6 from falling. Next, when you want to rewind the film after shooting is complete, use the rewind knob 16.
When the inner cylinder 6 is rotated to the left or right, the inner cylinder 6
rotates, and the blocking lever 21 is pushed away by the second stage 9 and positioned at the long diameter part of the same stage (Fig. 7), so that the inner cylinder 6 falls due to the elasticity of the spring 20, and the fork part 7 is pulled down, and the reel of the film cassette is moved. Once engaged, preparations for rewinding are completed. (FIG. 2) Next, to return from the state shown in FIG. 2 to the state shown in FIG. 6 can be raised in the same way. (FIG. 3) At this point, the rewinding knob 16 is rotated so that the blocking lever 21 comes to the position shown in FIG. 6 to prevent the inner cylinder 6 from falling. Therefore, from the state shown in Fig. 3, the rewind knob 1
If you push in 6, you will return to Figure 1.

The state shown in FIG. 8 shows the position of the blocking lever 21 used in a camera that opens the back cover by pulling up the film rewind knob. The lock on the back cover requires a certain amount of certainty, so unlocking it requires great strength and a long stroke.

Therefore, since the lifting stroke of the fork part alone as in the device of the present invention is insufficient, further pulling is made possible when the blocking lever is positioned at the short diameter part of the second stage 9 of the stepped part.

In addition, in the above-mentioned explanation of the main idea, the part that engages with the blocking lever provided on the inner cylinder is referred to as a stepped part, but the interpretation of this term is that it refers to the position where the inner cylinder is blocked by the blocking lever. It is something.

According to the present invention as described above, the frictional resistance that prevents reverse rotation due to the winding groove of the film hanging on the film rewinding shaft is not applied to the film winding lever as a load during the transfer of the film to the shooting position, so that the film can be quickly moved. You can take pictures.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the state of the present device during film transfer, Fig. 2 is a sectional view showing the state when the film is being rewound, and Fig. 3 is a state in the middle of returning from Fig. 2 to Fig. 1. Figure 4 is a slope view showing the inner cylinder,
Fig. 5 is a sectional view taken along the line A-A in Fig. 4, Fig. 6 is a plan view showing the step provided in the inner cylinder in the position shown in Fig. 1, and Fig. 7 is the state shown in Fig. 2. FIG. 8 is a plan view showing the position when opening the back cover. 3... Guide cylinder, 6... Inner cylinder, 7... Fork part, 8, 9, 10... Step part, 15... Rewinding shaft,
16... Rewind knob.

Claims (1)

[Claims for Utility Model Registration] It is made to be slidable in the axial direction and consists of an upper large diameter part 8 and a lower small diameter part 10, and in the middle between these, the long diameter is the diameter of the large diameter part 8 and the short diameter part 8 is formed. A fork member 6 is provided with elliptical portions 9 each having a diameter equal to the diameter of the small diameter portion 10, and further provided with a fork portion 7 below the small diameter portion 10 that engages with the winding shaft of the film cartridge.
an elastic member 20 that is in elastic contact with the fork member 6 on one side and urges it downward in the axial direction; and an elastic member 20 that is in elastic contact with the other side of the elastic member 20 and has a manual rotation operation part 16; a rewinding shaft 15 that is slidable in the axial direction of the fork member 6 and that engages the fork member 6 when pulled up to a position where the engagement is released and transmits rotational force to the fork member 6; It comes into contact with the lower end of the elliptical part 9 or the large diameter part 8 of the member 6, resists the biasing force of the elastic member 20, and locks the fork part 7 at a position retracted from the winding shaft of the film cartridge. A blocking lever 21 that is pushed against the side surface of the elliptical portion 9 by the rotation of the unwinding shaft 15 and is removed beyond the diameter of the large diameter portion 8 to release the locking. Film rewinding device.