JPS5814342Y2 - Self-trick king - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multiple exposure device for a camera equipped with a self-focusing device, and more particularly to a multiple exposure device that can prevent film frame displacement as much as possible during shutter charge operation for multiple shooting.

When performing multiple exposure photography with a camera equipped with a self-adjusting device, only the shutter must be charged by the film winding operation.

For this reason, the film winding lever must be operated in advance to rewind the film.
This is done by operating the reverse button, etc., to disconnect the winding lever from the sprocket, which serves as the fixed-rate winding control mechanism.

1. First, the configuration of this type of device will be explained with reference to FIG.
I will also mention the problems.

Film winding is performed by connecting a clutch pin 4a installed on the reverse fishing shaft 3 to a cut groove 5a of a clutch ring 5 provided on the sprocket 1.

When performing multiple exposure photography, the reverse button 3b is pressed to disengage the clutch pin 4a from the cut groove 5a.

Prior to the above operation, in order to prevent the film frame position from shifting,
A ratchet mechanism is used which prevents the spool shaft on which the film is wound from interlocking with the operation of the reverse button 3b, making it possible to operate the shutter charge with the film previously prevented from moving in the film winding direction. Become.

According to this configuration of the latch portion, during the return operation for coupling, the clutch pin 4 slides and rotates while being pressed against the plate surface of the clutch ring 5 by the urging force of the return spring 31.
When a reaches the edge of the cut groove 5a of the clutch ring 5, it will slide into the groove due to the biasing force of the return spring 31.

That is, the sliding contact point of the outer circular surface of the clutch pin 4a approaches the upper edge of the cut groove 5a of the clutch ring 5, and when the sliding contact point of the outer circumferential circular surface of the clutch pin 4a approaches the upper edge of the cut groove 5a, the return spring 31 is oriented to fit into the upper edge of the cut groove 5a. Due to the biasing force, the clutch pin 4a and the cut groove 5a fit together while sliding on the outer circular surface.

During operation of the fixed amount winding control mechanism, that is, during a winding operation using the winding lever, the clutch pin 4a receives a force in the winding direction, but during a return operation after winding is completed, it does not receive any force in the winding direction.

On the other hand, the clutch ring 5 is integrated with the sprocket 1 as a driven side, and even if the sprocket 1 is pressed to prevent film winding for multiple exposures, the curling of the film between the spool shaft and the sprocket 1 may cause a difference. Since it is in a state where it can freely rotate, the clutch pin 4
The sliding down of a causes the clutch ring 5 to be pushed around, that is, the sprocket shaft 2 is rotated somewhat in the film rewinding direction.

For this reason, there is a problem in that the film moves somewhat in the rewinding direction when the clutch portion is restored to connection.

This movement may become even larger due to a timing lag between the return operation and the locking release operation of the Sugur shaft.

Therefore, the object of the present invention is to provide a multiple exposure device for a camera equipped with a self-focusing device that can accurately prevent even such normally minute positional deviations.

To achieve the above object, the multiple exposure device in a camera equipped with a self-tapping device according to the present invention comprises: a sprocket having a cut groove for coupling; a sprocket shaft to which a winding drive force from a winding lever is transmitted; a clutch pin that engages with the sprocket shaft to transmit rotational force and is biased in a direction to engage with the groove of the sprocket, and rotates the sprocket when engaged with the sprocket; A camera equipped with a self-locking device that releases the connection between the sprocket shaft and the sprocket by disengaging the pin from the sprocket against the biasing force and only sets the shutter by rotating the winding lever. a first engaging portion that engages with the clutch pin when the clutch pin and the sprocket are engaged, and a first engaging portion that engages with the clutch pin when the clutch pin and the sprocket are engaged, and a first engaging portion that engages with the clutch pin when the clutch pin and the sprocket are disengaged, Accordingly, a second engagement portion having a play area in which the clutch pin and the sprocket shaft engage with each other with a time difference is provided on the sprocket shaft, and when the clutch pin and the sprocket are released from each other, the initial position of the winding lever is After the rotation, the clutch pin is rotated by the second engagement part, and when returning to connection, the clutch pin is engaged with the tenth engagement part by the biasing force, so that the clutch pin is only moved outside the play area. The clutch pin is coupled to the sprocket which is rotated in the driving direction and is placed stationary in the released state.

According to the above structure, the object of the present invention can be completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

FIG. 2 is a side sectional view showing an embodiment of a multiple exposure device that can be pressed on a camera equipped with a self-focusing device according to the present invention.

Sprocket 1 shown with a broken line is sprocket shaft 2
A clutch ring 5 is integrally provided at the lower part of the clutch ring 5.

That is, in this embodiment, the I,-) clutch ring 5 constitutes a part of the sprocket 1.

Sprocket shaft 2 that rotates while being supported by the quantitative winding mechanism
A drive gear 1 is fixed to the bottom of the button, and the drive gear T is pivotally supported by a bearing 6.

Inside the hollow cylinder of Suge rocket shaft 2 is I) Perth fishing shaft 3
is inserted.

The reverse fishing shaft 3 is biased downward by a spring 31, and a portion protruding downward from the drive gear 7 is provided with a groove portion 3a, a fishing portion 3b, a button, and a collar portion 3c.

A clutch pin 4 is fixed to the reverse fishing shaft 3 with a screw.

The clutch pin 4 has a small diameter portion 4a at the tip and a large diameter portion 4b at the rear end.
and a threaded portion 4c that is threadedly engaged with the reverse shaft (FIG. 2, AA sectional view).

The sprocket shaft 2 has guide grooves 2a and 2 at positions corresponding to the small diameter portion 4ah and large diameter portion 4b of the clutch pin 4.
b has been opened.

The guide groove 2a has a width sufficiently wider than the diameter of the clutch pin 4a, and the small diameter portion 4a protruding from the guide groove 2a slides on the upper surface of the clutch ring 5, and the cut groove 5 of the clutch ring 5 slides on the upper surface of the clutch ring 5.
can be engaged with a.

The clutch ring 5 is provided with a groove 5a having a width that matches the shaft width of the small diameter portion 4a, and the engagement of the small diameter portion 4a integrally connects the sprocket 1 and the reverse fishing shaft 3.

On the other hand, the guide groove 2b is opened at a position symmetrical to the guide groove 2a, and the large diameter portion 4b of the clutch pin 4 is loosely fitted therein.

The guide groove 2b consists of a stepped portion A, a side edge opening, and a lower edge section, and the stepped portion A is a portion with which the large diameter portion 4b engages when the small diameter portion 4a slides on the upper surface of the clutch ring 5. , the side edge opening is a part that transmits the driving force of the sprocket shaft 2 to the large diameter part 4b of the clutch pin 4 when the reverse button 3b is pressed,
A play area α wider than the groove width at the lower edge is provided, and the lower edge C is such that when the small diameter portion 4a engages with the cut groove 5a of the clutch ring 5, the large diameter portion 4b is fitted. This is the part to do.

FIGS. 3 and 4 are mechanical diagrams showing the structure of the ratchet part, with FIG. 3 showing a state in which the reverse button is pressed and FIG. 4 showing a state in which the reverse button is released.

The ratchet portion is a mechanism for preventing the spool shaft 80 on which the film is wound from rotating when the sprocket shaft 2 is rotated idly.

A ratchet gear 9 is provided on the spool shaft 8.
A ratchet lever 11 pivotally supported by a fixed portion is biased in a direction into which it engages with a ratchet gear 9.

The release lever 13 has one end fixed, the locking part 13a in the center engages with the leg at the other end of the ratchet lever 11, and the tip part is located between the flange 3c of the reverse fishing shaft 3 and the drive gear γ. 1 has been done.

The set lever 10 is biased by a spring in the direction of the groove 3a of the reverse fishing shaft 3, and the set lever 10 is attached to the groove 3a.
can be engaged.

Therefore, when the reverse button 3b is pressed, the set lever 10
engages with the groove 3a, the release lever 13 contracts, disengages the ratchet lever 11, and engages the ratchet lever 11 with the ratchet gear 9 (FIG. 3).

When the set lever 10 is disengaged from the groove 3a of the reverse fishing shaft 3 and the reverse fishing shaft 3 inside the sprocket shaft 2 is lowered, the release lever 13 is extended, and the locking part 13a rotates the ratchet lever 11, which engages the ratchet gear 9. Release the mesh (Figure 4).

Next, the operation when performing a shutter charge operation for multiple exposure photography using the apparatus according to the present invention having such a configuration will be explained mainly with reference to FIGS. 3 to 7.

When the reverse fishing shaft 3 is pushed upward, the small diameter portion 4a of the clutch pin 4, which is integrated with the reverse fishing shaft 3, is inserted into the cut groove 5a of the clutch ring 5.
It's coming out of.

In this state, the reverse fishing shaft 3 is locked and held in the groove 3a by the set lever 10.

By this operation, the ratchet lever 11 engages with the ratchet gear 9, resulting in a state in which rotation of the spool shaft 80 is prevented (FIG. 3).

Next, when the winding lever is operated, the sprocket shaft 2 rotates idly with the clutch pin 4 relative to the sprocket 1. In the initial operation, the sprocket shaft 2
The play movement is performed only in the play range α between the clutch pin 4 and the clutch pin 4.

That is, as shown in FIG.
Since the small diameter portion 4a comes out from point a, the large diameter portion 4b of the clutch pin 4 is at the position shown by the dotted line in FIG. 5 at that time.

Next, when the sprocket shaft 2 starts rotating by operating the winding lever, only the sprocket shaft 2 rotates until the side edge opening of the guide groove 2b comes into contact with the side collapse of the large diameter portion 4b of the clutch pin 4. , the subsequent rotation causes the sprocket shaft 2 to rotate together with the clutch pin 4.

During this rotational operation, the spool shaft 8 is prevented from rotating, so the film is not wound and only the shutter charge advances.

In the region where the sprocket shaft 2 button and the clutch pin 4 approximately rotate in the final range of operation, the locking by the set lever 10 to the groove 3a of the reverse fishing shaft 3 is released, and the reverse fishing shaft 3 is moved to the small diameter part of the clutch pin 4. 4a descends at 1 where it comes into contact with the upper surface of the clutch ring 5.

However, in this operating range, the locking action on the spool shaft 8 is still not released, and the spool shaft 8 is in a state where its rotation is prevented.

As the sprocket shaft 2 continues to rotate, the small diameter portion 4a of the clutch pin 4 slides on the upper surface of the clutch ring 5, and the small diameter portion 4a is attached to the upper edge of the cut groove 5a of the clutch ring 5.
In the state shown in FIG. 6 in which the sprocket shaft 2 is approximately half-extended, the winding operation by one rotation of the sprocket shaft 2 is completed, and the predetermined shutter charging operation is completed.

At this time, the small diameter portion 4a slides down into the cut groove 5a due to the biasing force of the spring 31, but this sliding movement is caused by the sliding of the large diameter portion 4b of the clutch pin 4 at the stepped portion A in the guide groove 2b. It is done through movement.

That is, when the rotation of the Sugerocket shaft 2 is completed, the subsequent rotation is prevented by the action of the quantitative winding mechanism and the clutch pin 4 guided by the guide groove 2b is in a fixed state. Due to the free rotation, the clutch pin 4 further rotates a little while falling into the groove 5a (Fig. 7). Therefore, due to the biasing force of the return spring 31 of the clutch pin 4, the clutch pin 4 falls with its own rotational movement. The ring 5, that is, the sprocket shaft 1 integral therewith remains stationary without receiving any acting force, and is released from the spool shaft 8 in the latter stage of the return operation (FIG. 4).

Therefore, the sprocket does not reverse during this return operation, and the film can remain stationary without moving the same amount.

As described above, according to the present invention, it is possible to prevent the driven side sprocket from reversing during return coupling, and it is possible to more reliably keep the film stationary during the shutter charging operation for multiple exposures.

The play area d of 1J4Wi, which is the widening of the upper edge of the guide groove 2b as the amount of play on the operated side in the device of the present invention, takes into account the diameter of the large diameter portion 4b of the clutch pin 4, the interlocking error of the drive system, etc. It will be effective if the decision is made based on the following.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a clutch section of a conventional device, FIG. 2 is a side sectional view showing an embodiment of a multiple exposure device in a camera equipped with a self-clutching device according to the present invention, and FIG.
Figures 4 and 4 are mechanical diagrams showing the structure of the ratchet part, Figure 3 shows the state in which the reverse button is pressed, Figure 4 shows the state in which the reverse button is released, and Figures 5 to 7. The figure shows the relationship between the clutch pin and the guide groove. 1... Sprocket, 2... Sprocket shaft, 2a
. 2b... Guide groove, 3... Reverse shaft, 4... Clutch pin, 5... Clutch ring, 5a... Cut groove,
8... Spool shaft, 9... Ratchet gear, 10...
...Set lever 11...Ratchet lever 12...
・Release lever.

Claims (1)

[Scope of utility model registration request] A sprocket having a cut groove for coupling, a sprocket shaft to which the winding driving force from the winding lever is transmitted, and a direction in which the rotational force is transmitted by engaging with the sprocket shaft and engages with the cut groove of the Sugerocket. a clutch pin that is biased by a force and rotates the sprocket when engaged with the sprocket, and the clutch pin is disengaged from the sprocket against the biasing force, thereby causing the sprocket shaft and the sprocket to be connected to each other. In a multiple exposure device for a camera equipped with a self-locking device that releases the connection of the winding lever and only sets the shutter by rotating the winding lever, the shutter is engaged with the clutch pin when the clutch pin and the sprocket are engaged. and a second engaging portion provided with a play area in which the clutch pin and the sprocket shaft engage with each other with a time difference in response to the initial rotation of the winding lever when the clutch pin and the sprocket are released from each other. is provided on the sprocket shaft, and when the clutch pin and the sprocket are disconnected, the clutch pin is rotated by the second engaging portion after the initial rotation of the winding lever, and when the connection is restored, the button is pressed. In this case, the clutch pin is engaged with the first engaging portion by the urging force, thereby rotating in the drive direction by the amount of play reduction, and the clutch pin is rotated in the driving direction by the amount of play reduction, and the clutch is attached to the sprocket that is stationary in the released state. A multiple exposure device that can be pressed on a camera equipped with a self-focusing device characterized by being configured by combining pins.