JPH075526A - Shutter charge mechanism - Google Patents

Abstract

PURPOSE:To provide a shutter charge mechanism performing shutter charge while photographic film having one perforation per each frame is fed by one frame with simple constitution at a flow cost. CONSTITUTION:The pressing surface 32a of a pressing part 32 is pressed counterclockwise by a leaf spring 34, and the tooth 30a of a sprocket 30 is turned to a position where it slides on the edge surface of the film 17. By operating a winding dial 20 after releasing a shutter, the tooth 30a slips on the surface of the film while the perforation 18 is moved. After the tooth 30a is engaged with the perforation 18, the sprocket 30 is rotated by following the feed of the film. While the sprocket 30 is rotated by 1/4, a shutter lever 39 is moved to a charge position and the shutter charge is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film provided with one perforation for each frame, and relates to a mechanism for charging a shutter during feeding of one frame.

[0002]

2. Description of the Related Art In order to efficiently perform magnetic recording outside a photographing screen range, for example, JP-A-3-179442.
A photographic film provided with one perforation per frame is known from Japanese Patent Publication No. In a camera using such a film, it is convenient to perform one frame advance of the film by the motor while monitoring the passage of the perforation by the photosensor, and further perform the shutter charge by driving the motor. However, low-priced cameras and film units with lenses, which are pre-stored and housed in the film, as is known by "Sharp Run Hi" (product name), include photosensors and motors for cost reduction. Therefore, it is necessary to mechanically detect the movement of the perforations and perform the one-frame feed or the shutter charge.

A camera using a so-called 110 film cartridge is known as a camera using a film of one frame perforation. See also 63-
Japanese Patent No. 51329 discloses a film unit with a lens in which a 110 film cartridge is incorporated. The shutter charge mechanism used for these is
A locking claw that is spring-biased in a substantially vertical direction toward the film is provided. The film is fed by the winding operation, and when the perforations move, the locking claws protrude and enter the perforations. The shutter charging is performed by utilizing the movement of the locking claws at this time or the swinging of the locking claws when the film is continuously fed.

[0004]

However, in the case of the above-mentioned shutter charge mechanism, in addition to the necessity of pressing the locking claw in the film direction in order to surely insert the locking claw into the perforation, the completion of the film feeding. The locking pawl must be pulled out from the perforation at the time of shutter release and shutter release, and the locking pawl must be pressed against the film again for the next film feeding. Therefore, there is a drawback in that the moving mechanism of the locking claws tends to be complicated.
In particular, when the film surface is curved at the exposure position, as in the case of a lens-fitted photo film unit such as the above-mentioned "Shooting Run Hi," the moving mechanism of the locking claws becomes more complicated, and the number of parts and Not only will the installation space increase, but it will be difficult to assemble automatically and the cost increase will be unavoidable.

The present invention has been made to solve the above problems, and provides a shutter charge mechanism for performing shutter charge while feeding one frame of a photographic film provided with one perforation per frame. The purpose is to provide at low cost with a simple structure.

[0006]

In order to achieve the above object, the present invention rotates a sprocket having N teeth by 1 / N during one frame feed of the film, and the rotation of the sprocket causes shutter charge. I am going to do it. Therefore, a biasing means for intermittently biasing the sprocket at each rotational position is used so that one tooth contacts the film surface every 1 / N rotation of the sprocket.
Further, the charging member is rotated by 1 / N rotation of the sprocket, the shutter lever for driving the shutter blades is moved to the charging position in conjunction with this, and then the shutter lever is locked at the charging position by the locking member. ing.

The number of teeth provided on the sprocket is 3 to
About 5 pieces are preferable, and as described in claim 2, in order to intermittently urge the sprocket according to its rotational position, a regular N prismatic pressing portion is provided coaxially and integrally with the sprocket, and one surface thereof is provided. It is convenient and effective to press the leaf spring against. Further, as described in claim 3, N cams are provided integrally with the sprocket so as to be rotationally symmetric for each 1 / N rotation of the sprocket, and these cams are used as the charging member, thereby saving the number of parts. Also, the efficiency of assembly can be improved.

[0008]

With the biasing means, the teeth of the sprocket are rotated to a position where they are brought into sliding contact with the film surface. When the film is fed after the shutter release, the teeth slip on the film surface until the perforation moves. After the teeth are engaged with the perforations, the sprocket rotates following the film feed. While the sprocket rotates 1 / N, the shutter lever moves to the charge position to perform shutter charging.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the shutter charge mechanism of the present invention is applied to a film unit with a lens will be described below. In FIG. 7, which is an exploded view of the unit main body of the lens-fitted film unit, the unit main body 10 includes a main body 11, a front cover 12, and a rear cover 13.
A cartridge chamber 14 and a film chamber 15 are formed in the main body portion 11, and a cartridge 16 and a film 17 drawn from the cartridge 16 into a roll shape are stored therein. The film 17 is provided with one perforation 18 per frame along one side edge thereof. As the exterior body of the unit main body 10, a paper box provided with an opening at a required portion necessary for a photographing operation is used.
The illustration is omitted.

A winding dial 20 and an exposure unit 21 are attached to the main body 11. Winding dial 2
A knurl is engraved on the outer peripheral surface of 0, and a fork is integrally provided on the bottom surface. The fork penetrates the upper wall of the cartridge chamber 14 and is engaged with the spool 16 a of the cartridge 16. Then, when the winding dial 20 is rotated counterclockwise after photographing, the photographed film is caught in the cartridge 16. Exposure unit 21
Includes a shutter charge mechanism and a shutter drive mechanism. Further, a shutter blade 22 and a return spring 23 are assembled to the main body portion 11, and a shutter cover 26 is attached so as to cover the front surface thereof. A lens mount portion is formed on the shutter cover 26, and the photographing lens 27 is formed there.
Is fitted.

A front cover 12 is hooked on the front surface of the main body 11 to which the respective parts are attached as described above.
A photographing window 12a and a finder objective window 12b are provided on the front surface of the front cover 12, and a shutter button 28 is provided on the upper surface.
Are integrally formed. When the shutter button 28 is pushed in, the release arm 28a integrally provided on the bottom surface acts on a required portion of the exposure unit 21, the shutter blade 22 opens via the shutter drive mechanism, and the return spring 23.
The exposure is performed once by returning to the closed position by the urging of.

The rear cover 13 is hooked to the back surface of the body 11 to cover the inside of the body 11 in a light-tight manner. Rear cover 1
A curved film support surface 13a is formed on the inner surface of the film 3, and supports the film 17 in a curved state at the exposure position behind the dark box. As a result, even if a single lens is used as the taking lens 27, it is possible to suppress the influence of field curvature and obtain a clear image.

FIG. 1 shows a main part of a shutter charge mechanism and a shutter drive mechanism which constitute the exposure unit 21, and shows a state before performing shutter charge. A sprocket 30 is rotatably attached to the main body 11 so that the teeth of the sprocket protrude into the feeding path of the film 17. The sprocket 30 is provided with four teeth 30a and engages with the perforations 18 when the film 17 is fed leftward in the drawing. On the upper surface of the sprocket 30, a pressing portion 32 having a quadrangular prism shape and four windmill-shaped charge cams 33 are integrally connected at a position of 90 ° rotational symmetry, and these rotate coaxially with the sprocket 30. To do.

The pressing portion 32 has four pressing surfaces 32a,
One surface thereof is pressed by the leaf spring 34.
At the rotational position shown in FIG. 1, the sprocket 30 is stopped by the leaf spring 34 in the counterclockwise direction, and the teeth 30a on the right side of the perforation 18 are lightly pressed against the film surface. A charge lever 36 having two arms 36a and 36b on the tip side is pivotally attached to the main body 11 via a shaft 35, and is biased clockwise by a spring 37. A protrusion 36c is formed at an intermediate portion of the charge lever 36, and the protrusion 36c enters a valley portion between two adjacent charge cams 33. As shown in an enlarged view in FIG. 8, a play D is provided in the rotation direction of the charge cam 33 at the engaging portion between the valley portion between the charge cams 33 and the protrusion 36a of the charge lever 36.

In the vicinity of the moving paths of the arms 36a and 36b,
The shutter lever 39 and the locking lever 40 have shafts 41 and 42.
Is pivoted by. The shutter drive spring 4 is attached to the shaft 42.
4 is attached and each end is hooked on the shutter lever 39 and the locking lever 40, respectively. As a result, the shutter lever 39 moves counterclockwise,
0 is biased clockwise.

The shutter lever 39 is integrated with a kick-off lever 39a and a passive lever 39b, and an upper portion of the kick-off lever 39a has an engaging claw portion 3 as shown in FIG.
9c is formed. The locking lever 40 includes a locking protrusion 40a that engages with the locking claw 39c at the charging position,
A locking claw portion 40b that engages with the knurls of the winding dial 20 to prevent the winding dial 20 from rotating, and a locking lever 40 that contacts the arm 36b immediately before completion of charging.
Is integrally formed with the restriction protrusion 40c that prevents the rotation of the.

In the state shown in FIG. 1, the shutter drive spring 44 in which the lower portion of the locking claw portion 39c is wound around the shaft 42.
The shutter lever 39 is prevented from rotating in the counterclockwise direction by abutting against the peripheral surface of the locking projection 40a, and the inner wall surface 46 of the locking projection 40a contacts the outer surface 45 of the locking claw 39c. The stop lever 40 is prevented from rotating in the clockwise direction. The outer surface 45 of the locking claw portion 39c is formed in a convex arc shape substantially along the rotation trajectory of the shutter lever 39, and the inner wall surface 46 of the locking projection portion 40a is correspondingly concave. Is formed in.

The operation of the shutter charge mechanism thus configured will be described. When the winding dial 20 is operated from the state shown in FIG. 1 to rotate the spool 16a counterclockwise to wind the film 17 into the cartridge 16, as shown in FIG. 2, the film 17 is moved to the left side of the drawing. Be transferred to. At this time, the pressing surface 3 is pressed by the leaf spring 34.
Since 2a is pressed and the sprocket 30 is given a rotational force in the counterclockwise direction, the sprocket 30 is rotated by the amount of backlash D as the film 17 is transferred, and the teeth 30a are projected toward the film 17 side.

When the operation of the winding dial 20 is continued, the teeth 30 of the sprocket 30 are attached to the perforations 18 of the transferred film 17 as shown in FIG.
a is involved. After this, as shown in FIG. 4, the sprocket 30 is driven to rotate counterclockwise as the film 17 is transferred. As the sprocket 30 is rotated, the charge cam 33 moves the protrusion 3 of the charge lever 36.
6c is pressed to rotate the charge lever 36 counterclockwise against the bias of the spring 37. As a result, the arm 36a pushes down the passive lever 39b of the shutter lever 39 downward in the drawing, so that the external surface 45 of the locking claw portion 39c.
While the shutter slides on the inner wall surface 46 of the locking protrusion 40a, the shutter lever 39 is rotated clockwise.

As shown in FIG. 5, when the transfer of the film 17 progresses and the tip of the charge cam 33 reaches the vicinity of the apex of the projection 36c, the shutter lever 39 rotates clockwise to a position slightly beyond the charge position. And the locking claw 39
c is moved to the left of the locking protrusion 40a. At this time,
The locking lever 40 tries to rotate clockwise by the biasing force of the shutter drive spring 44, but the restricting protrusion 40c of the locking lever 40 abuts against the tip end of the arm 36b of the charge lever 36, and this rotation occurs. Is blocked.

When the operation of the winding dial 20 is further continued, as shown in FIG. 6, the tip end of the charge cam 33 is disengaged from the apex of the protrusion 36c, and the charge lever 36 is rotated clockwise by the bias of the spring 37. Along with
The protrusion 36c falls to the valley with the next charge cam 33. At the same time, the contact between the arm 36b and the restricting protrusion 40c is released, so that the locking lever 40 is rotated clockwise, and the locking claw 40b contacts the knurl of the winding dial 20 to wind it. The dial 20 is locked. Further, since the pressing of the passive lever 39b by the arm 36a is also released, the shutter lever 39 tries to rotate counterclockwise, but when the shutter lever 39 slightly rotates, the locking claw portion 39c causes the locking protrusion of the locking lever 40 to rotate. Abuts the portion 40a,
The shutter lever 39 is locked at the charge position.

When the shutter button 28 is pressed, the release arm 28a rotates the locking lever 40 counterclockwise, and the engagement between the locking claw portion 39c and the locking protrusion 40a is released. At this moment, the shutter lever 39 is rotated counterclockwise at a high speed by the bias of the shutter drive spring 44,
The kick-off lever 39a kicks off the shutter blade 22. As a result, the exposure opening formed behind the shutter blade 22 is opened and closed, and the film 17 set at the exposure position is exposed.

When the pressing operation of the shutter button 28 is stopped, the rotation of the locking lever 40 by the release arm 28a is released, so that the locking lever 40 tries to return to the clockwise direction by the bias of the shutter drive spring 44. The rotation of the shutter lever 39 immediately after the shutter release causes the inner wall surface 46 of the locking projection 40a to come into contact with the external surface 45 of the locking claw 39c, thereby preventing the locking lever 40 from rotating clockwise. The locking lever 40 is stopped in the state shown in FIG. As a result, the lock of the winding dial 20 is released, and the winding operation becomes possible.

In the embodiment described above, the number of teeth of the sprocket is set to four, but the present invention is not limited to this, and may be three or five, for example. However, if the sprocket has three teeth, the tooth length is extended. Further, when the number of teeth of the sprocket is changed, the number of pressing surfaces and the number of charge cams also increase / decrease according to the number of teeth of the sprocket.

[0025]

As described in detail above, according to the shutter charge mechanism of the present invention, by intermittently urging the sprocket, one tooth is brought to the film surface every 1 / N rotation of the sprocket. Since they come into contact with each other, it is possible to realize a low-cost sprocket system with a simple structure even for a photographic film with one frame perforation.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state after shutter release of a shutter charge mechanism of the present invention.

FIG. 2 is an explanatory diagram of a shutter charge mechanism showing a state immediately before film winding is started and perforations are engaged with teeth of a sprocket.

FIG. 3 is an explanatory view of the shutter charge mechanism showing a state immediately after the perforations are engaged with the teeth of the sprocket.

FIG. 4 is an explanatory diagram of a shutter charge mechanism showing a state in which the shutter lever is being rotated toward a charge position.

FIG. 5 is an explanatory diagram of a shutter charge mechanism immediately before entering a charge state.

FIG. 6 is an explanatory diagram of a shutter charge mechanism set to a charge state.

FIG. 7 is an exploded perspective view showing the configuration of the unit body of the lens-fitted film unit that employs the shutter charge mechanism of the present invention.

8 is a partially enlarged explanatory view showing an engagement state between a charge cam and a charge lever shown in FIG.

FIG. 9 is a perspective view showing a relationship between a shutter lever and a locking lever.

[Explanation of symbols]

 10 unit body 11 body portion 17 film 18 perforation 20 winding dial 21 exposure unit 22 shutter blades 27 photographing lens 28 shutter button 30 sprocket 32 pressing portion 33 charge cam 34 leaf spring 36 charge lever 39 shutter lever 40 locking lever

Claims (3)

[Claims] 1. A shutter charge mechanism for moving a shutter lever for driving a shutter blade to a charge position in association with one frame feed of a film provided with one perforation per frame, N pieces engaging with the perforations. A sprocket having teeth, a urging means for intermittently urging the sprocket at each of a plurality of rotational positions so that one of the N teeth comes into contact with the film surface, and the film feed causes the sprocket to contact the film surface. A charging member that moves the shutter lever to a charging position in conjunction with the rotation when the contacted teeth engage with the perforation and the sprocket rotates.
It consists of a locking member that locks the shutter lever at the charge position.
A shutter charge mechanism characterized by performing shutter rotation by rotating N times. 2. The shutter charge mechanism according to claim 1, wherein the urging means is a leaf spring that is pressed against one surface of a regular N prismatic pressing portion that is provided coaxially and integrally with the sprocket. . 3. The charging member is a sprocket 1
3. A shutter according to claim 2, characterized in that it comprises N cams integrated with the sprocket so as to be rotationally symmetric for every N revolutions, and these cams have a shape having directionality with respect to the rotational direction thereof. Charge mechanism.