JPH043538B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a manual film winding device for a camera or a film holder, and more particularly to a lever winding film winding device.

[Conventional technology]

Conventionally, manual film winding devices transmit the motion of a drive member that rotates in one direction in conjunction with the rotation of a winding knob or lever to a film winding shaft or sprocket shaft, either directly or through a winding wheel train. Ta.

In the case of 135 film, the film is stopped by fixed angle rotation of the sprocket shaft that feeds the film, and in the case of 120/220 film, it is engaged with a well-known index plate that rotates as the film advances. Usually, this was done by a winding member locking the film winding member.

[Problem to be solved by the invention]

However, with conventional manual film winding devices, the film winding speed varies considerably depending on the photographer's habits and shooting conditions, and especially when using a lever that is easy to operate, the film winding speed is extremely fast. This made it possible to wind the film.

When the film is rapidly wound in this way,
In the case of perforated film such as 135 film, the perforation may break and winding of the film becomes impossible, and in the case of roll film such as 120/220 film, the locking timing of the winding member may be delayed. This causes the inconvenience that the film is wound up excessively, making it impossible to take a predetermined number of images.

Furthermore, regardless of the type of film, static electricity is generated when the film is wound up at high speed and comes into sliding contact with the pressure bonding plate, guide rollers, etc. When the charged film is separated from the pressure bonding plate, etc., it is discharged and the film is exposed to light, causing spots. It is also widely known that

The present invention has been made in view of the above points, and an object of the present invention is to provide a film winding device that can keep the film winding speed below a predetermined speed even if the winding lever is operated rapidly.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a driving member that rotates in one direction when a film winding lever is operated, and a driven member that is rotatably mounted on the same axis as the driving member and rotates in synchronization with the film winding member. a member, an elastic body such as a spring that is engaged between the driven member and the driving member and can drive the driven member to follow the driving member, and rotation of the driven member at a predetermined speed or higher. The present invention provides a film winding device including a governor mechanism for regulating the rotational speed of the driven member, and in which the elastic body allows a shift in the rotational phase of the driven member when the driving member rapidly rotates at a speed higher than the predetermined speed.

[Effect]

By configuring the film winding device according to the present invention as described above, even if the driving member is rotated by the winding lever at a higher speed than a predetermined speed, the rotational phase of the driven member is shifted due to the expansion and contraction of the elastic body. The member rotates at a speed regulated by the governor mechanism, and the film winding member, which rotates at the same time, is not wound at a speed higher than a predetermined speed.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings.

The figure shows an embodiment in which the present invention is applied to a winding device for 120/220 film. A driven gear 1, which is a driven member, has an upper end portion of a film winding shaft (not shown) fixedly fixed in its center hole 2.
By rotating in the counterclockwise direction, the film winding spool, which moves together with the film winding shaft, is rotated and the film is wound up. This driven gear 1 is provided with an arc-shaped elongated hole 3 with a center angle θ, and a spring hooking pin 4 is implanted on the lower surface of the opposite side of the elongated hole 3 with respect to the center hole 2. to be engraved.

A drive gear 6, which is a drive member, is rotatably attached by loosely fitting the center hole 7 into a film winding shaft that is integrated with the driven gear 1, and has ratchet teeth 10 on its outer periphery.
to be engraved. Further, a pin 8 that can be inserted into the long hole 3 is installed on the upper surface of the driving gear 6, and a tension coil spring 9 that constitutes an elastic body is installed between this pin 8 and the pin 4 of the driven gear 1. With the pin 8 in contact with one end 3a of the elongated hole 3, the coil spring 9 has a predetermined initial tension, and the driven gear 1 and the driving gear 6
The rotation of the drive gear 6 in the direction of arrow A causes the driven gear 1 to follow and rotate.

The drive gear 6 is made rotatable in the direction of arrow A via a one-way clutch by operating a winding lever (not shown), and its ratchet teeth 10
The anti-reverse pawl 11 having a left-handed action is engaged by a spring 12 to allow rotation of the drive gear 6 in the direction of arrow A and prevent rotation in the opposite direction.

On the other hand, the teeth 5 of the driven gear 1 are brought into mesh with the teeth 14 of the driven gear 13, and the driven gear 13 is connected to the shaft 15.
The escape wheel 17 is integrated with the escape wheel 17 having ratchet-like teeth 16 through the escape wheel 17, and the distal end pawl of the swingable pallet 18 is engaged with the teeth 16. A governor mechanism is constituted to prevent rapid winding of the film by preventing a driven gear 1 meshing with a driven gear 13 integrated with an escape wheel 17 from rotating at a predetermined speed or higher.

Next, the operation of the embodiment configured as described above will be explained.

Before winding the film, the driven gear 1 rotates counterclockwise relative to the drive gear 6 due to the initial tension of the coil spring 9, and the pin 8 is attached to one end 3 of the elongated hole 3.
a, and the driven gear 1 and the driving gear 6 are integrated.

From this state, when the drive gear 6 is rotated in the direction of arrow A by operating the winding lever on the camera body side or the film holder side, the driven gear 1 follows this and rotates in the same direction due to the biasing force of the coil spring 9. Rotate to wind up the film.

At this time, if the rotational speed of the driven gear 1 is below a predetermined speed regulated by the governor mechanisms 17 and 18, it rotates together with the drive gear 6, but the drive gear 6 rotates suddenly and The rotation speed is governor mechanism 1
When the speed of the driven gear 1 exceeds a predetermined speed regulated by 7 and 18, the pin 8 expands the coil spring 9, moves away from one end 3a of the elongated hole 3, and moves toward the other end 3b. The gear 1 rotates at the above-mentioned predetermined speed while causing a rotational phase shift with respect to the drive gear 6, and winds up the film at the predetermined speed.

Here, the center angle θ of the elongated hole 3 is set to a sufficient angle to allow movement of the pin 8 within the elastic limit of the spring 9, but the operation of the winding lever is extremely fast.
In other words, even if the rotational speed of the drive gear 6 becomes extremely high and the pin 8 comes into contact with the end 3b of the elongated hole 3, the subsequent rotational speed of the drive gear 6 is directly regulated by the governor mechanisms 17 and 18, and winding is prevented. Prevents rapid lever operation itself. Note that at this point, the accumulated reaction force of the spring 9 has increased and the operation speed of the winding lever has been reduced, so there is no risk that the governor mechanisms 17 and 18 will be damaged by the impact.

When a predetermined amount of film has been wound, a winding stopper that engages with an index plate (not shown) locks the teeth 5 of the driven gear 1 to stop the film from being fed.
Since the rotational speed of the driven gear 1 never exceeds the above-mentioned predetermined speed, the winding member is attached to the driven gear 1.
The amount by which the film advances within the time it takes to lock the toothed portion 5 is also limited, and there is no risk of static electricity being generated due to excessive winding of the film or rapid winding.

In this embodiment, a tension coil spring 9 is used as the elastic body connected between the driven gear 1 and the drive gear 6, but this may also be a mainspring or the like, or a compression coil may be used. A spring, rubber member, etc. may also be used.

Further, in the above embodiments, the present invention is applied to a winding device for 120/220 film, but it can also be implemented to a winding device for 135 film without any problems.

〔Effect of the invention〕

As described above, in the film winding device according to the present invention, when the rotational speed of the driving member becomes faster than the predetermined rotational speed of the driven member regulated by the governor mechanism, the film winding device according to the invention Since the elastic body allows the rotational phase shift of the driven member, no matter how fast the driving member is wound by the winding lever, the film winding member, which rotates in conjunction with the driven member, will not exceed a predetermined speed. There is no risk of rotation, and rapid winding of the film is prevented.

As a result, it is possible to effectively prevent the insufficient number of shots due to excessive film winding, the inability to wind the film due to perforation breakage, and the generation of static electricity due to rapid film winding.

[Brief explanation of drawings]

The figure is a perspective view showing an embodiment of the present invention. 1... Driven gear, 3... Long hole, 5... Teeth,
6... Drive gear, 9... Spring, 10... Ratchet tooth, 11... Reverse prevention pawl, 13... Driven gear,
14...teeth, 16...teeth, 17...escape wheel, 18...pallet.

Claims (1)

[Claims] 1. A driving member that rotates in one direction when a winding lever is operated, a driven member that is coaxially mounted to the driving member so as to be rotatable relative to the film winding member and rotates in conjunction with the film winding member, and a driven member that rotates in the same direction as the film winding member. an elastic body such as a spring that is engaged between the driven member and the driven member and can drive the driven member to follow the driving member; and a governor mechanism that restricts rotation of the driven member at a predetermined speed or higher; A film winding device characterized in that the elastic body allows a rotational phase shift of the driven member when the driving member rapidly rotates at a speed higher than the predetermined speed.