JPH09236888A - Film unit with lens and method for resetting counter plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent film unit with a lens having the proper pressing force of a spring and excellent in fitness recycling. SOLUTION: The first spring 5 and the second spring 8 are separately arranged as the springs pressing the shutter driving lever 55 and the lock lever 59 of an exposure unit 17. Besides, the pressing force of the spring 56 is set to be stronger than that of the spring 58. Then, the winding lock of a film is surely released by the rejection of the lever 59 by the lever 55. The lever 55 and the lever 59 are engaged by surface contact so as to prevent damage or wear from occurring caused by friction. The outside circumference of a counter plate 7 is provided with a tooth non-existing section where several teeth do not exist. By facing the tooth non-existing section to a cam member 60 when the plate 7 is reset, the rotation of the plate 7 is allowed in a reset direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens-fitted photo film unit, and more particularly to an improved shutter mechanism and a counter plate resetting method.

[0002]

2. Description of the Related Art As a film unit with a lens, which has a simple exposure mechanism and is loaded with an unexposed photographic film and a patrone in advance at the time of manufacture, which eliminates the need for cumbersome film loading and rewinding operations, for example, "Photorun" Su
per800 (trade name) "is manufactured and sold by the applicant. In such a lens-fitted film unit, a winding operation for rotating the winding knob engaged with the spool of the cartridge for accommodating the exposed photographic film in the cartridge is performed for each photographing.

In a film unit with a lens,
A sprocket that is rotated by being driven by the perforation of the photographic film that is transferred with the winding operation of the winding knob, a cam member that is rotated coaxially with the sprocket, and a shutter that utilizes the rotation of this cam member. An exposure unit in which a shutter driving lever and a locking lever for charging, a counter plate for displaying the number of photographable images, and the like are integrated is incorporated.

By the way, an APS (Advanced Photo System) is proposed, which is composed of a new photo film and a cartridge, and a camera and various processing devices that utilize them.
Has been announced. This photographic film compatible with APS has a new perforation arrangement format. In this photo film, a total of two perforations are formed, one at the head and one at the rear in the film feeding direction of each frame, and shooting is performed at a predetermined position.

Further, a lens-fitted film unit to be sold with the above-mentioned film cartridge loaded therein has been announced. In this lens-fitted film unit, the sprocket is rotated by utilizing the perforations that are close to each other between the rear side and the front side between adjacent frames, and is used for shutter charging and stepping the counter plate.

[0006]

In each of the lens-fitted film units described above, the unexposed photographic film can be wound up in the cartridge or the cartridge body by rotating the winding knob with the shutter button slightly pressed. There was a problem. This is because the engagement of the cam member by the locking lever is released before the shutter release by pressing the shutter button.
To solve this, the shutter release is first performed by the shutter drive lever by pressing the shutter button, and then the shutter drive lever kicks the locking lever to rotate it against the spring bias, and The invention has been proposed in which the engagement of the above is released. In order to make the present invention more effective, it is important to balance the biasing force of the spring with respect to the shutter drive lever and the locking lever.

Further, the APS compatible photo film is provided with a photographing region where photographing is actually performed and an exposure prohibiting region where photographing is prohibited. This exposure prohibited area is located on both sides of the shooting area and is used during the development process.Therefore, the lens-fitted film unit must be devised so that the exposure to the exposure prohibited area can be reliably prevented. is there. In order to solve this problem, the projection formed on the counter plate is brought into contact with the locking lever at the non-charged position after the prescribed number of shots has been taken, and the rotation of the counter plate is prevented, so that the exposure-prohibited area in the uncharged state An invention has been proposed in which the film cartridge is wound into a film cartridge.

The exposure unit is reused after collection,
In that case, the counter plate must be reset.
However, if the counter plate and the locking lever are brought into contact with each other as described above, resetting cannot be performed unless the counter plate is once removed from the exposure unit and reassembled, which causes a problem that work efficiency is deteriorated. It was Further, if the counter plate is forcibly rotated to the reset position without being removed, the teeth on the outer periphery of the counter plate and the cam member will be crushed and cannot be reused.

Further, for example, since the engagement and the disengagement are constantly repeated between the locking lever and the shutter drive lever, the exposure unit is likely to be damaged due to impact or friction at that time, and the reuse rate of the exposure unit is lowered. Was causing the

Further, when the winding knob is rotated, the winding knob is constantly locked by the check claw to prevent the winding knob from rotating in the opposite direction. For this reason, if the winding knob is forcibly wound up, it cannot rotate in the opposite direction, so that strong tension may be applied to the photographic film that has been stopped. When the shutter release is performed in such a state, the tension on the photographic film is momentarily released, which causes a problem that slight vibration occurs in the photographic film at the photographing position and the image quality is deteriorated.

An object of the present invention is to provide a lens-fitted film unit and a method of resetting a counter plate, which solve the above problems and problems.

[0012]

In order to solve the above-mentioned problems, the lens-fitted film unit according to claim 1 is provided with springs for urging the shutter drive lever and the locking lever separately, and the shutter drive lever is provided. The urging force of the spring for the lock is made stronger than the urging force of the spring for the locking lever. According to this, the shutter drive lever can reliably kick off the engagement lever from the cam member against the spring urging of the engagement lever, so that the biasing force of the spring can be adjusted more delicately. It will be possible.

Further, in the lens-fitted photo film unit according to the present invention, the engaging portion of the locking lever and the engaged portion of the shutter drive lever engaged by the engaging portion are respectively formed with flat portions. , Surface contact is made. According to this, deterioration due to friction between the locking lever and the shutter driving lever is delayed, and the reuse rate of the exposure unit is improved.

Further, in the lens-fitted film unit according to the third aspect of the present invention, one end of the spring for urging the locking lever is extended and brought into contact with the cam member, and the cam member and the sprocket rotate in the driven direction during shutter release. It was designed to prevent you from doing so. According to this, it is possible to reduce the vibration to the photographic film due to the excessive winding of the winding knob via the sprocket.

The lens-fitted photo film unit according to a fourth aspect of the present invention is such that, on the outer periphery of the counter plate, initial teeth that are engaged with the cam member when assembled in the lens-fitted photo film unit, and final teeth that are engaged with the cam member after the photographing is completed. An edentulous section in which several graduated teeth are not formed is provided between the teeth.

Further, according to a fifth aspect of the present invention, in the counter plate resetting method, the shutter driving lever is rotated from the outside toward the charging position to engage the locking lever to release the contact with the projection. The counter plate is rotated using the toothless section so that the initial teeth are meshed with the cam member. According to this, the counter can be reset without disassembling the exposure unit and without damaging the teeth of the counter plate and the cam member.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a film unit with a lens according to the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 2, the lens-fitted film unit 2 includes a unit main body 3 in which a film cartridge is pre-loaded and various photographing mechanisms are incorporated, and an exterior paper 4 partially covering the unit main body 3. .

A shutter button 6 and a counter window 7 are provided on the upper surface of the unit body 3, and a finder 8, a photographing lens 9, a strobe charging switch 10, and a strobe light emitting portion 11 are provided on the front surface.
Etc. are provided. Also, a winding knob 12 that is rotated from one frame to another is exposed from the rear side.
The exterior paper 4 is coated with an adhesive on the back surface and the unit body 3
And an opening for exposing the taking lens 9, the finder 8, the counter window 7, and the like to the outside.

As shown in FIG. 3, the unit main body 3 includes a main body base 16 on which a film cartridge 14 is loaded,
An exposure unit 17 and a strobe unit 18 mounted on the front surface of the main body base 16 and a front cover 19 mounted so as to cover the front and back sides of the main body base 16.
And a rear cover 20. These are assembled by pawl engagement.

The film cartridge 14 is composed of a plastic cartridge body 22 and a photographic film 23 housed in the cartridge body 22. A photo film 23 is provided in the cartridge body 22.
A spool 25 to which one end is locked is rotatably incorporated, and further has a built-in film sending mechanism as disclosed in JP-A-6-266053.

Further, a rod-shaped light-shielding lid 26, which opens and closes the film entrance and exit by being rotated from the outside, is provided at a film entrance (not shown) through which the photographic film 23 enters and exits the cartridge main body 22 as a conventional telem. It is incorporated in its place.

As shown in FIG. 4, the photographic film 23 comprises a film free end portion 23a, a photographing area 23b, and a film locking portion 23c. In the photographing area 23b, two large and small perforations 28 and 29 having different sizes are alternately arranged at two kinds of intervals along one side edge. Perforations 28 and 29 are for each frame 30
In the film unit 2 with the lens, the photographic film 23 is wound into the cartridge body 22 for each photographing, so that the large perforation 28 is set in the film feeding direction. , The small perforations 29 indicate the rear side. Each perforation 28, 29 is a piece 3
The number corresponding to the number of 0 is provided.

The end portion of the film locking portion 23c is the spool 2
5 and is wound around the spool 25 by the rotation of the spool 25 by the rotation operation of the winding knob 12. Film free end 23a and film lock 23
“C” is an area that is not used for shooting, and is an exposure-prohibited area that is used during development processing. Therefore, the film free end portion 23a and the film locking portion 23c
Is wound up in the cartridge body 22 in an unexposed state.

The illustrated photographic film 23 is for a lens-fitted film unit obtained by subjecting a photographic film used in a general camera to an additional process. The difference between the photo film for the camera and the photo film 23 for the lens-fitted photo film unit is the size of the large perforation 28 and the small perforation 31 for initial charging added within the range of the film locking portion 23c. In the photo film for the camera, all the perforations have the same size, and there is no perforation in the film locking portion 23c. The perforation 32 at the free end 23a of the film is for performing the first shutter charge when the film is loaded in the camera.

At the center of the base 16 of the main body, there is provided a light-shielding tube 34 for shielding the photographic optical path from the exposure unit 17 mounted on the front side to the photographic film 23. On the back side of the light-shielding cylinder 34, an aperture for defining an exposure range for the photographic film 23 is formed.
A film support surface 20a is formed on the rear cover 20 so as to face the aperture. On the front side of the light-shielding tube 34, an opening 46 for guiding the subject light transmitted through the photographing lens 9 to the aperture is formed. An opening 34a for exposing a sprocket incorporated in the exposure unit 17 toward the photographic film 22 is formed above the light-shielding cylinder 34.

A cartridge body 22 and a film roll 35 in which the photographic film 23 is wound in a roll shape are housed on both sides of the light-shielding cylinder 34 at the manufacturing stage.
The cartridge chamber 36 and the film roll chamber 37 are formed integrally.

In the cartridge chamber 36 and the film roll chamber 37, the rear cover 20 is assembled on the back side of the main body base portion 16, the cartridge chamber bottom lid 39 integrally formed on the rear cover 20 and the film roll chamber 37. By closing the bottom cover 40, an appropriate light blocking ability can be obtained. The bottom lids 39 and 40 are connected to the rear cover 20 via a bendable thin portion, and the bottom lid 39 is opened when the film cartridge 14 is taken out from the used lens-equipped film unit 2. It

The winding knob 12 is rotatably attached to the upper portion of the cartridge chamber 36. The hoisting knob 12 has a gear formed on the outer periphery, and a drive shaft formed on the lower surface is engaged with a spool 25 of the cartridge body 22. The photo film 22 is wound up by the spool 25 by being rotated counterclockwise in the drawing every time one frame is shot. Further, the winding knob 12 is prevented from rotating in the reverse direction by the engagement of the check pawl 45 formed on the upper surface of the cartridge chamber 36 with the gear.

Although not shown, the cartridge chamber 36
When the film cartridge 14 is taken out of the cartridge chamber 36, a light-shielding lid closing mechanism that closes the light-shielding lid 26 in conjunction with opening of the bottom lid 39 is incorporated in the upper surface and the side surfaces of the cartridge.

The strobe unit 18 comprises a printed circuit board 18a provided with a strobe circuit and a strobe light emitting section 11 assembled to the printed circuit board 18a. The strobe charging switch 10 provided on the front cover 19 presses the switch contact piece. Strobe charging is performed by the contact of 42 with the contact portion of the printed circuit board 18a, and the flash is emitted by synchronizing with the shutter release. The printed circuit board 18a is also provided with a metal contact piece for connecting a dry cell 37 serving as a power supply for the strobe unit 18.

As shown in FIGS. 1, 5 and 6, the exposure unit 17 is unitized by assembling various parts to a plastic molded base portion 48, and is detachably mounted on the front surface of the light shielding tube 34. . A plurality of components constituting a shutter mechanism are assembled on the upper surface of the base portion 48, and a lens 49 constituting the finder 8 is held. The photographing lens 9 is provided on the front
An exposure opening for exposing the photographic film 23 is formed between the lens cover 50 and the base 48, and shutter blades for opening and closing the exposure opening are swingable. Has been assembled.

On the upper surface of the base portion 48, the shafts 52, 53,
A bearing portion 54 is formed. A shutter drive lever 55, a first spring 56, and a counter plate 57 are inserted into the shaft 52 in this order. The shaft 53 has a second spring 58 and a locking lever 5.
9 are inserted in order. A cam member 60 is provided on the bearing portion 54.
Is inserted. In addition, a sprocket 61, an urging spring 62 assembled on the upper surface of the base portion 48, and a top plate 6
3 constitute the exposure unit 17. The top plate 63 is assembled on the upper portion of the base portion 48, and supports the upper end of the shaft 52 with the hole 63a, and supports the upper end of the cam member 60 with the notch 63b. The top plate 63 is entirely formed of transparent plastic, and the reference numeral 64 is a lens for enlarging and displaying a scale marked on the upper surface of the counter plate 57.

The bearing 54 has a hole penetrating to the lower side, and the lower end of the inserted cam member 60 is projected from the lower side. A sprocket 61 is engaged with the lower end of the cam member 60, and the sprocket 61 is exposed from the upper opening 34 a of the light shielding tube 34 toward the photographic film 23. On the outer periphery of the sprocket 61, a pair of large and small teeth 66, 67 which sequentially mesh with a pair of large and small perforations 28, 29 adjacent to each other on the rear side and the leading side between adjacent frames.
However, two pairs are provided with 180 ° rotational symmetry. The sprocket 61 is used for one frame of the photographic film 23.
Is rotated half a counterclockwise direction in the figure following the transfer of the film when the film is wound into the cartridge body 22.

In the cam member 60, a counter drive shaft 69, a winding stop cam 70, a charge cam 71, a biasing cam 72, and a shaft 73 are integrally formed in this order from above. The shaft 73 is
The sprocket 61 is inserted into the bearing portion 54 and engaged with the lower end.

The biasing cam 72 is composed of a pair of protrusions formed with 180 ° rotational symmetry. Since the photographic film 23 is not provided with continuous perforations, a state occurs in which the teeth 66 and 67 of the sprocket 61 do not mesh with any of the perforations 28 and 29. In this state, the urging spring 62 attached to the base plate 48 presses the urging cam 72, and the cam member 6
0 is rotated in the driven direction. Thus, the small teeth 67 of the sprocket 61 are moved to a position where the small teeth 67 can mesh with the next perforation 29. The biasing spring 62 is a leaf spring obtained by bending a thin metal plate.

The shutter drive lever 55 has a first spring 56.
It is urged in the counterclockwise direction (release position) by. One end 56 a of the first spring 56 is hung on a pin 48 a on the base 48, and the other end 56 b is hung on a spring hook 55 a of the shutter drive lever 55. The shutter charge cam 71 is composed of a blade-shaped projection formed with 180 ° rotational symmetry, and presses the protrusion 55b of the shutter drive lever 55 to move clockwise (charge position) as shown in FIG. Rotate.

The locking lever 59 is turned clockwise (winding stop position) by the second spring 58 whose one end 58a is hooked on the pin 48b on the base portion 48 and the other end 58b is hooked on the spring hooking portion 59a. Is being urged. Cam member 60
When the groove 70a of the locking cam 70 reaches a position matching the claw portion 59b of the locking lever 59, the locking lever 59 is biased by the second spring 58, as shown in FIG. It is rotated clockwise to insert the claw 59b into the groove 70a. As a result, the rotation of the cam member 60 is blocked, and the film winding state is established. The first spring 56 and the second spring 58 have a stronger urging force than the second spring 58 by being retracted during assembly.

When the locking lever 59 is rotated in the clockwise direction to engage the claw portion 59b with the winding stop cam 70, the engaging portion 74 protruding downward from the locking lever 59 causes the shutter to move. The shutter drive lever 55 is held at the charge position by entering into and engaging with the rotation locus of the engaged portion 75 protruding upward from the drive lever 55. As shown in FIG. 7 which is an arrow A, the engaging portion 74 and the engaged portion 75 are engaged with each other by the flat surface portions 74a, 75a formed on the engaging portion 74 and the engaged portion 75, respectively. Are brought into contact with each other. As described above, when the portions that are engaged and disengaged for each photographing are brought into surface contact with each other, the impact at the time of contact between the engaging portion 74 and the engaged portion 75 and the disengagement at the time of releasing the engagement The sliding contact makes it difficult for both to be scratched or worn, and is effective in improving the reuse rate of the exposure unit 17 after recovery.

When the locking lever 59 is engaged with the winding stop cam 70 and the shutter drive lever 55, the winding stop claw 59c is engaged with the teeth on the outer circumference of the winding knob 12. Thereby, the film is stopped by the cam member 60,
The film winding is stopped by inhibiting the rotation of the winding knob 12. The sprocket 61 is stopped with the large teeth 66 meshing with the second perforation 28 of the photographic film 23 during shutter charging.

When the shutter button 6 is pressed after the engaging portion 74 and the engaged portion 75 are engaged with each other, the pressing rod 77 formed on the lower surface of the shutter button 6 (see FIG. 3).
Presses the spring hook piece 59a of the locking lever 59, and the locking lever 59 is rotated counterclockwise against the bias of the second spring 58. When the locking lever 59 is rotated counterclockwise, the engagement between the engaging portion 74 and the engaged portion 75 is released, and the shutter driving lever 55 is
It is rotated counterclockwise from the position shown in FIG. 5 to the position shown in FIG.

When the shutter drive lever 55 is rotated counterclockwise, the kicking arm 55b formed below the engaged portion 75 kicks one end of the shutter blade. As a result, the shutter blade swings around the shaft attachment portion to open the exposure opening, and the exposure to the photographic film 23 is performed.
Since the shutter blade is urged by the spring toward the position to close the exposure opening, the exposure opening is immediately closed.

The locking lever 59 is held in a state of being rotated by the pressing rod 77 of the shutter button 6 when the engaging portion 74 contacts the side surface of the engaged portion 75.
However, the engagement between the claw member 59c and the locking cam 70 is not released only by the rotation of the shutter button 6 by pressing. This is to prevent the unexposed photographic film from being wound up which is caused by rotating the winding knob by slightly pressing the shutter button.

In the vicinity of the engaging portion 74 of the locking lever 59,
The protrusion 79 is formed integrally. In this convex portion 79,
When the shutter drive lever 55 rotates counterclockwise at the time of shutter release, the kick-out protrusion 80 protruding upward near the engaged portion 75 is abutted. Since the urging force of the second spring 58 is weaker between the first spring 56 and the second spring 58, when the protrusion 80 is kicked off and hits the projection 79, the locking lever 59 resists the urging of the second spring 58. Then, it is rotated counterclockwise.

As a result, the claw portion 59c is locked by the winding stop cam 70.
The film is released from the groove 70a, the locking pawl 59c is separated from the teeth of the winding knob 12, and the film locking is released, so that the photographic film 22 can be wound up. The convex portion 7
9 and the kick-off projection 80 are also brought into contact with each other between the flat portions, so that deformation or damage due to impact at the time of kick-off is unlikely to occur.

Further, one end 58a of the second spring 58 is extended and further curved, so that it abuts on the biasing cam 72 and prevents the cam member 60 from rotating in the driven direction. As the film is wound by the winding knob 12, a tension is generated in the photo film 23 so as to be pulled toward the cartridge body 22 side. This tension is instantly released when the lock of the winding knob 12 is released by the shutter release. At this time, a slight vibration may occur in the photographic film 23 during exposure.

One end 58a of the second spring 58 has a biasing cam 7
2 is prevented from rotating in the driven direction, the vibration of the photo film 23 when the tension is released is suppressed via the cam member 60 and the sprocket 61. The second spring 58
Has a weak urging force, and the one end 58a is gently curved.
When is rotated, the one end 58a is pressed by the urging cam 72 and is easily displaced, thereby allowing the rotation of the urging cam 72.

As shown in FIG. 8, a plurality of teeth 82 are formed continuously on the outer periphery of the counter plate 57. These teeth 82 mesh with a locking cam 83 having a gourd-shaped cross section formed on the upper portion of the cam member 60, and when the drive gear and the step gear, which will be described later, do not mesh, the lens-fitted film unit 2 The counter gear 57 serves as a locking gear that prevents the counter plate 57 from accidentally rotating due to vibration or impact applied to the counter gear 57. Note that in FIGS. 8, 9 and 10, the shutter drive lever 55 is not shown in order to prevent the drawings from being complicated.

On the upper surface of the counter plate 57, graduations 84 made up of dots and numbers corresponding to the teeth 82 are marked along the rotation direction, and the unit is placed via the lens 64 of the top plate 63 arranged above. It is displayed externally from the counter window 7 of the main body 3. The counter plate 57 is provided with a scale 84 so as to display the remaining number of shootable images.

On the lower surface of the counter plate 57, there is integrally formed a small-diameter step gear 86 for stepping the counter plate 57 step by step. On the outer periphery of the step gear 86,
A plurality of teeth 87 are formed, and the teeth 87 are meshed with a drive gear 88 formed of a pair of projections formed below the locking cam 83 of the counter drive shaft 69, and the cam member 60 rotates half a turn in the figure. It is rotated clockwise by one tooth.

The teeth 87 of the stepping gear 86 are provided on the counter plate 57.
Are slightly out of phase with respect to the teeth 82 in the rotational direction. This is because during the rotation of the cam member 60, the locking cam 8
3 and the counter plate 57, or one of the drive gear 88 and the stepping gear 86 is in a state of constant meshing. Erroneous display of the counter plate 57 can be prevented.

On the outer periphery of the counter plate 57, a toothless section 90 in which several teeth are not formed is formed. The toothless section 90 is used for resetting the counter plate 57 when the exposure unit 17 is detached from the lens-fitted film unit 2 collected after the photographing and is reused.

In the toothless section 90, the final tooth 82a which is engaged with the locking cam 83 when all the photographic films 23 have been photographed and the photographic film 23 is wound into the cartridge body 22, and the exposure unit. 17 to the base 16
Initial teeth 82 to be engaged with the locking cam 83 when assembled to the
It is formed between b. The step gear 86 also has a toothless section 91 between the teeth 87 corresponding to the final teeth 82a and the initial teeth 82b of the counter plate 57.

As shown in FIG. 7, the stepping gear 86 has a ridge shape having teeth 87 formed on the outer peripheral surface thereof, and a boss 93 is formed at the center of the lower surface of the counter plate 57. The locking lever 59 described above is provided with a protruding piece 94 protruding upward from the upper portion of the engaging portion 74. The protruding piece 94 is formed on the inner diameter surface 86a of the step gear 86 and the boss 93. Placed between.

A locking projection 96 is formed on the outer peripheral surface of the boss 93 so as to project radially. This locking projection 96
When the final tooth 82a of the counter plate 57 meshes with the locking cam 83 by the film winding operation after the photographing of the final frame 30a on the film free end portion 23a side of the photo film 23 is finished, Locking lever 5 that is not meshed with 70, that is, not in the shutter charge state
It abuts on the protruding piece 94 of 9. According to this, the rotation of the counter plate 57 is blocked, the rotation of the cam member 60 biased by the biasing spring 62 is also blocked, and the rotation of the sprocket 61 is blocked via the cam member 60. .

When the rotation of the sprocket 61 is prohibited,
Since the large and small teeth 66 and 67 are not projected from the film rail surface 97 through which the photographic film 23 passes, the film free end 23a of the photographic film 23 can be wound into the cartridge body 22 without any trouble. Further, since the sprocket 61 is not rotated by the small teeth 29 of the final top 30a and the perforation 32 for initial charging, shutter charging is not performed and the film free end portion 23a which is the exposure prohibited area is not.
It is possible to reliably prevent exposure to the.

Next, the operation of the above embodiment will be described. The user who purchases the lens-fitted film unit 2 shown in FIG. 2 first rotates the winding knob 12 to prepare for photographing. When the winding knob 12 is rotated, the spool 25 of the cartridge body 22 shown in FIG. 3 is rotated in the winding direction, and the film engaging portion 23c shown in FIG.

Photo film 2 at the time of winding the film
3 and the urging of the urging spring 62, the sprocket 61 and the cam member 60 are rotated in the driven direction against the urging of one end 58a of the second spring 58, and the small teeth 67 are used for initial charging. It is moved to a position where it can mesh with the perforations 31. When the photographic film 23 is further transferred, as shown in FIG. 5, the small teeth 67 of the sprocket 61 mesh with the perforations 31 and the large teeth 66
b sequentially engages with the large perforations 28. During the period from the start of the rotation operation of the hoisting knob 12 to the engagement of the large tooth 66 with the large perforation 28, the cam member 6
0 is rotated half a counterclockwise direction.

While the cam member 60 rotates half a turn, the charge cam 71 presses the projection 55b of the shutter drive lever 55 to rotate the shutter drive lever 55 clockwise against the bias of the first spring 56. Let When the shutter drive lever 55 is rotated toward the charging position, the pressing of the shutter drive lever 55 by the kicking projection 80 is released, and the locking lever 59 is rotated clockwise by the bias of the second spring 58. Move.

The locking lever 59 rotated clockwise locks the rotation of the cam member 60 by engaging the claw portion 59b with the groove 70a of the unwinding cam 70, and the engagement portion 74 moves the shutter driving lever 55. Of the engaged portion 75 is inserted into the movement locus of the engaged portion 75. Thus, the shutter drive lever 55 released from the pressing by the charge cam 71 rotates counterclockwise by the bias of the first spring 56, and the engaged portion 75 and the engaging portion 74 are engaged. The engagement between the engaging portion 74 and the engaged portion 75 is, as shown in FIG.
Since it is performed by the surface contact between the 5b, neither scratch nor abrasion is caused on both.

Further, the locking lever 59 engages the winding stopping claw 59c with the gear on the outer circumference of the winding knob 12 to prevent the rotation operation. Further, the counter plate 57 is rotated clockwise by the locking cam 83, the stepping gear 86 and the driving gear 88, and a scale 84 indicating the remaining number of shots is displayed from the counter window 7. This completes the preparation for photographing the lens-fitted film unit 2.

After that, when the photographing range is confirmed with the finder 8 and the shutter button 6 is pressed, the pressing rod 77 presses the spring hooking portion 59a of the locking lever 59 to move it counterclockwise (unwinding release position). Rotate. Thereby, the engagement between the engaging portion 74 of the locking lever 59 and the engaged portion 75 of the shutter driving lever 55 is released, and the shutter driving lever 55 is biased by the first spring 56 as shown in FIG. Rotates counterclockwise.

The shutter drive lever 55 has a base portion 48.
One end of the shutter blade, which is swingably assembled between the shutter blade and the lens cover 50, is kicked off by the arm 55b and rocked. As a result, the exposure opening is opened, and the photographic film 23 is exposed. Further, the shutter blade closes the exposure opening immediately by the bias of the spring.

When the winding knob 12 is wound too tightly, the shutter release and the photographic film 23 are taken together.
The tension that was being applied to it is released, but the second
Since one end 58a of the spring 58 contacts the biasing cam 72 and suppresses the vibration of the photographic film 23 via the cam member 60 and the sprocket 61, the deterioration of the image quality does not occur.

The shutter drive lever 55 kicking the shutter blades kicks the projection 79 of the locking lever 59 by the kicking projection 80 near the engaged portion 75. As a result, the locking lever 59 is rotated counterclockwise because the urging force of the second spring 58 is weaker than the urging force of the first spring 56, and the claw 59b comes out of the groove 70a of the locking cam 70, and the film is released. The winding is released. Then, when the winding knob 12 is rotated in the film winding direction (counterclockwise),
As described above, the cam member 60 is rotated half a turn, and the shutter charge, the rotation of the counter plate 57 for one graduation, and the film stop are performed.

After the filming and film winding are repeated as described above and the filming on the last frame 30a is completed, the remaining cartridge body 22 of all the photographic films 23 including the frame 30a and the free film end 23a. To wind up. When the winding knob 12 is rotated, the photographic film 23 is transferred toward the inside of the cartridge body 22, and the sprocket 61 rotates with the large teeth 66 pressed by the second perforation 28 of the top 30a.

When the sprocket 61 is rotated, as shown in FIG. 8, the large teeth 66 of the sprocket 61 are retracted into the film rail surface 97, and the rotation of the cam member 60 at this time causes the counter plate 57 to move slightly clockwise. Is rotated to
The locking projection 69 comes into contact with the protruding piece 94 of the locking lever 59 in the non-charged state.

As a result, the rotation of the counter plate 57 is locked, and the rotation of the cam member 60 biased in the driven direction by the biasing spring 62 is also locked. Then, since the sprocket 61 is stopped in a state where the teeth do not protrude from the film rail surface 97, the photographic film 23 is not affected at all.
Can be wound up in the cartridge body 22.
Further, the sprocket 61 is provided with a small perforation 29 of the top 30a and a perforation 32 for initial charging.
Therefore, no shutter charge is performed during the winding of the film free end 23a, and the film free end 23a can be reliably wound in an unexposed state.

The lens-fitted film unit 2 for which all the photographing has been completed is handed by the user to a development store or the like when requesting simultaneous printing. At the photofinishing shop, the film unit 2 with a lens to the film cartridge 14
Is taken out, development processing and print processing are performed, and the print photograph and the negative film stored in the cartridge main body 22 are returned to the user.

The lens-fitted photo film unit 2 from which the photo film cartridge 14 has been taken out is collected by the manufacturer and separated into parts to be reused after inspection after disassembly and parts to be reused as raw materials. The exposure unit 17, which is a reusable part, is removed from the unit body 3 and sent to the inspection process.

In the inspection process of the exposure unit 17, the presence or absence of dirt or scratches on the taking lens 9 and the finder lens 49 is checked, and the operation of the shutter mechanism is checked. Prior to the operation inspection of the shutter mechanism, the counter plate 57 is reset.

To reset the counter plate 57, first, the shutter driving lever 55 is rotated from the outside toward the charging position by a jig or the like. Then, as shown in FIGS. 5 and 9, the locking lever 59 rotates to hold the shutter drive lever 55 at the charging position. As a result, the locking projection 96 of the counter plate 57 and the protruding piece 9 of the locking lever 59.
The contact with No. 4 is released. In this state, even if the locking lever 59 is rotated, the protruding piece 94 abuts against the tip of the locking projection 96 and further rotation is prevented, so that the locking lever 59 and the shutter driving lever 55 And the shutter release is not performed.

When the shutter is forcibly charged as described above, the toothless sections 90 and 91 of the counter plate 57 and the stepping gear 86 face the locking cam 83 and the drive gear 88. Thereafter, as shown in FIG.
Is rotated clockwise using the toothless sections 90 and 91, the initial teeth 82b are engaged with the locking cam 83, and the counter plate 57 is reset. Then, the locking lever 5
Since the shutter can be released by the rotation of the shutter 9, the exposure unit 17 that has passed the release inspection is assembled into a new lens-fitted film unit 2.

In the above embodiment, the diameter of the spring material is made large in order to make the biasing force of the spring for the shutter drive lever stronger than that of the spring for the locking lever. The biasing force may be increased by using or assembling in a wound state. Also, the counter plate in which the stepping gear and the locking gear are integrated is used,
It can also be used for counter plates without locking gears. Further, although the toothless section is provided on both the counter plate and the step gear, the toothless section may be provided only on the step gear. this is,
This is because the amount of meshing between the teeth of the counter plate and the locking cam is shallow, so that the teeth of the counter plate can be rotated while passing over the locking cam.

Although the lens-fitted film unit has been described, it may be used in a shutter device of a camera.

[0075]

As described above, in the lens-fitted film unit of the present invention, the springs for urging the shutter drive lever and the locking lever are separately provided, and the urging force of the spring for the shutter drive lever is related. Since it is stronger than the biasing force of the spring for the stop lever, the locking lever can be kicked off against the spring bias and the film winding stop can be reliably released. Further, it is possible to more finely adjust the biasing force of the spring.

Further, since the engaging portion of the locking lever and the engaged portion of the shutter drive lever engaged by this engaging portion are respectively formed with flat surfaces so as to be in surface contact with each other, the locking lever Deterioration due to friction with the shutter drive lever is delayed, and the reuse rate of the exposure unit is improved.

Further, one end of the spring for urging the locking lever is extended and brought into contact with the cam member so as to prevent the cam member and the sprocket from rotating in the driven direction at the time of shutter release. The vibration of the photo film at the time can be reduced through the sprocket.

Further, a toothless section is provided on the outer circumference of the counter plate, the shutter drive lever is forcibly charged, and the counter plate is rotated by utilizing the toothless section so that the initial teeth are meshed with the cam member. Therefore, it is possible to reset the counter without disassembling the exposure unit and without damaging the teeth of the counter plate and the cam member. In addition, since the number of components is not increased and the operation for resetting is simple, it can be implemented at low cost.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of an exposure unit of a lens-fitted film unit of the present invention.

FIG. 2 is a perspective view showing an appearance of a film unit with a lens.

FIG. 3 is an exploded perspective view showing a configuration of a unit main body.

FIG. 4 is a front view of the film cartridge in a state where the photo film is pulled out.

FIG. 5 is a plan view showing a state of the exposure unit in a shutter charged state.

FIG. 6 is a plan view showing a state of the exposure unit immediately after a shutter release.

FIG. 7 is a view on arrow A showing an engaged state of a locking lever and a shutter drive lever.

FIG. 8 is a plan view showing a state of the exposure unit at the end of use.

FIG. 9 is a plan view illustrating a state of the exposure unit when a shutter charge is performed after use is completed.

FIG. 10 is a plan view showing a state of the exposure unit when the counter plate is reset.

[Explanation of symbols]

 2 film unit with lens 14 film cartridge 17 exposure unit 22 cartridge body 23 photo film 55 shutter drive lever 56 first spring 57 counter plate 58 second spring 59 locking lever 60 cam member 61 sprocket 90, 91 toothless section

Claims (5)

[Claims] 1. A sprocket that is driven and rotated by the winding and transfer of the photographic film that is meshed with the perforations of the photographic film every time one frame is photographed, a cam member that rotates coaxially with the sprocket, and a rotation of this cam member. A shutter drive lever that is rotated to the charge position against the spring bias; and a locking lever that is rotated by the spring bias to engage the shutter drive lever and the cam member that are in the charge position, When the shutter drive lever is rotated in the release direction by the spring bias, the locking lever is kicked against the spring bias to release the engagement between the locking lever and the cam member. A spring for urging the drive lever and the locking lever is provided separately, and the urging force of the spring for the shutter drive lever is set to the locking lever. Lens-fitted photo film unit, characterized in that it was stronger than the biasing force of the spring of use. 2. A flat surface portion is formed in each of the engaging portion of the locking lever and the engaged portion of the shutter drive lever engaged by the engaging portion so as to be in surface contact with each other. The film unit with a lens according to claim 1. 3. A spring for urging the locking lever is extended to abut against a cam member to prevent the cam member and the sprocket from rotating in a driven direction at the time of shutter release. The film unit with a lens according to claim 1 or 2. 4. A cam member that rotates in association with the winding and transfer of a photographic film that is performed for each frame shooting, a locking lever that charges the shutter by the rotation of the cam member, and the number of images that can be shot on one surface. The scale shown is provided, a plurality of teeth with which the cam member is meshed are formed on the outer periphery, and an exposure unit consisting of a disc-shaped counter plate that is rotated by one scale by the rotation of the cam member is provided, In the lens-fitted film unit in which the projection projected from the counter plate comes into contact with the locking lever in the non-shutter charge state by the film winding after the photographing is finished and the rotation of the counter plate is blocked, the outer periphery of the counter plate is , Between the initial teeth that are meshed with the cam member when assembled in the lens-fitted film unit and the final teeth that are meshed with the cam member after the end of shooting, Film unit, characterized in that the edentulous section is provided with graduation of the teeth are not formed. 5. A method of resetting a counter plate, which is performed when recycling an exposure unit of a lens-fitted film unit according to claim 4, wherein the shutter drive lever is rotated from the outside toward a charge position to drive the shutter. Using the rotation of the locking lever to lock the lever at the charge position, the contact with the protrusion is released, and the counter plate is rotated using the toothless section to cam the initial teeth. A method for resetting a counter plate, characterized by engaging with a member.