JP3606662B2 - Film unit with lens - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens-fitted photo film unit, and more particularly to a film winding mechanism.
[0002]
[Prior art]
The lens-equipped film unit has a main body base formed by projecting the cartridge storage chamber for storing the cartridge and the film storage chamber for storing the unexposed photographic film with a gap on both sides of the exposure opening. Are integrally formed of an elastic plastic material. A dark box for guiding subject light from the photographing lens to the exposure opening is disposed in front of the exposure opening of the main body base. The film winding mechanism is provided above the dark box. When the photographic film is wound up by a length corresponding to the length of one frame by rotating the winding knob disposed above the cartridge storage chamber, the locking lever The sprocket is engaged with the perforations of the photographic film while the winding pawl of the web rotates to the winding position and engages with the teeth provided on the outer periphery of the winding knob, preventing the winding knob from rotating in the film winding direction. Also locks the rotation.
[0003]
[Problems to be solved by the invention]
By the way, the rotation trajectory of the winding knob in the film winding direction is a rotation trajectory area in which half of the line connecting the rotation centers of the winding knob and the locking lever is separated from the winding pawl, and the other half is winding. It becomes the rotation trajectory area that comes toward the pawl. Naturally, the winding pawl can be prevented from rotating in the film winding direction by entering the rotation trajectory area that comes toward, but this blockage can be prevented at the center of rotation between the winding knob and the locking lever. Acts to widen the spacing. In addition, there is a gap between the dark box and the cartridge storage chamber, and the base of the main body is formed of an elastic plastic material. As a result, when the film winding is stopped, if the rotation operation is forcibly performed further, the winding knob slips due to the widening of the interval described above, and the rotation operation is allowed, and the film winding may continue. There is. If such a problem occurs, the photographic film is wound up with the sprocket locked, and therefore the perforation is broken or damaged by the sprocket. Alternatively, if the photographic film is strong, the sprocket is broken or damaged.
[0004]
It is an object of the present invention to provide a lens-fitted film unit that improves the reliability of a film winding stop mechanism and prevents breakage and damage to perforations and sprockets.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an interval regulating member for connecting a cartridge storage chamber and an exposure unit or a support portion of a main body base to which the exposure unit is mounted, and after film winding is performed. Further, the spacing regulating member regulates the space between the cartridge storage chamber and the exposure unit so that the space is not widened by the force applied to the locking lever by rotating the winding knob in the film winding direction . As the interval regulating member, one of the cartridge storage chamber and the exposure unit or the support portion is provided with a locking claw protruding toward the space, and the other is provided with a locking claw. It is desirable to comprise with the to-be-latched part to engage. The winding force applied to the winding knob after the film winding is stopped by engaging the locking claw and the locked portion in a direction in which the space between the cartridge storage chamber and the exposure applying mechanism does not widen. Thus, the space between the cartridge storage chamber and the exposure applying mechanism can be regulated so as not to widen.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 and 2, the lens-fitted photo film unit 10 includes a main body base 11, a rear cover 12, an exposure unit 13, a photographic film with a cartridge 14, and a front cover 15. An exposure unit 13 is detachably attached to the front surface of the main body base 11. The rear cover 12 is detachably attached to the back of the main body base 11 and stores the photographic film 14 with a cartridge in a light-tight manner between the rear cover 12 and the main body base 11.
[0007]
The front cover 15 is detachably attached to the front surface of the main body base 11 and covers the exposure unit 13 from the front and up and down directions with the main body base 11. On the upper surface of the front cover 15, there is provided a shutter button 16 that is cut out and elastically formed.
[0008]
A cartridge housing chamber 18 and a film roll chamber 19 are integrally formed in the main body base 11 with gaps on both sides of the exposure opening 17. The cartridge storage chamber 18 is a chamber for storing the cartridge 20, and the film roll chamber 19 is a chamber for storing the unexposed photographic film 21 drawn from the cartridge 20 in the form of a film roll.
[0009]
The bottoms of the cartridge storage chamber 18 and the film roll chamber 19 are open. After the photographic film 14 with the cartridge is loaded, the bottom cover 22 and 23 provided on the rear cover 12 are light-tightly closed. It is. The bottom lid 22 is a lid for taking out the cartridge 20 containing the photographed photographic film 21.
[0010]
A winding knob 24 is rotatably disposed on the cartridge storage chamber 18. The winding knob 24 is integrally formed with a shaft that engages with the spool 25 of the cartridge 20 loaded in the cartridge storage chamber 18. This shaft constitutes a film winding mechanism together with the winding knob 24. A part of the winding knob 24 is exposed from the opening 26 of the rear cover 12, and the spool 25 is driven and rotated by rotating the exposed part in the film winding direction (arrow direction shown in FIG. 1). The photographed film 21 is wound up inside the cartridge 20.
[0011]
A tooth row 24 a is formed on the outer periphery of the winding knob 24. A check claw 27 provided on the main body base 11 is engaged with the tooth row 24a. The check pawl 27 prohibits the winding knob 24 from being rotated in the direction opposite to the film winding direction.
[0012]
Specifically, as shown in FIG. 2, a part of the divided dark box 28 is provided between the cartridge storage chamber 18 and the film roll chamber 19. An exposure unit 13 in which an exposure imparting mechanism is unitized is detachably attached to the front surface of the dark box 28. The exposure unit 13 is a unitized part in which an exposure application mechanism such as a photographing lens 30, a film winding mechanism, a shutter mechanism, and a film counter mechanism is incorporated in a base in which the remaining divided dark box 29 is integrally formed. By attaching the exposure unit 13 to the main body base 11, the divided dark boxes 28 and 29 are joined to form a complete dark box.
[0013]
On the front surface of the exposure unit 13, a locking claw 31 is provided that protrudes toward the cartridge storage chamber 18. When the exposure unit 13 is attached to the main body base 11, the locking claw 31 is engaged with a locked portion 32 provided on the outer wall of the cartridge storage chamber 18, so that the cartridge storage chamber 18 and the exposure unit 13 are connected to each other. It works so as not to widen the interval. These locking claws 31 and the locked portion 32 constitute an interval regulating member. In addition, the latching claw 31 may be provided in the cartridge housing chamber 18, and the locked portion 32 may be provided in the exposure unit 13. Further, the number of the space regulating members composed of the locking claw 31 and the locked portion 32 is not limited to one, and a plurality of spacing regulating members may be provided.
[0014]
The cartridge 20 is composed of two plastic parts, and a lid member that can be opened and closed is provided inside the film delivery port 33. Key grooves 34 are formed at both ends of the lid member. These key grooves 34 are respectively exposed to the outside from the side surfaces along the axial direction of the spool 25. In the gap between the exposure unit 13 and the cartridge storage chamber 18, a lid member opening / closing mechanism 35 that closes the lid member in conjunction with the operation of opening the bottom lid 22 of the rear cover 12 performed in the developing station is incorporated.
[0015]
As shown in FIG. 3, the lid member opening / closing mechanism 35 includes a lid member drive shaft 37, a spring 38, an interlocking lever 39, and the like. The lid member drive shaft 37 is supported so as to be rotatable between a position where the lid member is opened and a position where the lid member is closed. The lid member drive shaft 37 includes a drive shaft 40 that engages with the key groove 34 and a cam 41 that is formed integrally with the drive shaft 40, and is directed toward a position where the lid member is closed by a spring 38. Is energized.
[0016]
When the bottom cover 22 is closed, one end 39a of the interlocking lever 39 is pushed by a part 22a of the bottom cover 22, and the interlocking lever 39 rotates clockwise about the shaft 42. If it will be in such a state, the other end 39b will oppose the urging | biasing of the spring 38, will push the cam 41 clockwise, and will be in the state which the drive shaft 40 rotated to the position which opens a cover member. When the bottom cover 22 is opened, a part 22a is retracted, and the pressure on the one end 39a of the interlocking lever 39 is released. As a result, the cam 41 is urged by the spring 38 to rotate counterclockwise, and the drive shaft 40 closes the lid member.
[0017]
The photographic film 21 has a length composed of a film front end area and a film rear end area that cannot be used for photographing, and a film exposure area used for photographing, and the film rear end is engaged with a spool 25. In the film exposure portion, two perforations 50 and 51 are alternately arranged along one side edge at two kinds of intervals, and the center between the long intervals of the perforations 50 and 51 is the film of the exposure opening 17. Exposure is performed by winding up one frame at a time so as to match the center of the feeding direction (longitudinal direction).
[0018]
As shown in FIGS. 4 and 5, the shutter mechanism, the film winding stop mechanism, and the film counter mechanism include a sprocket 52, a rotating member 53, a shutter driving lever 54, a locking lever 55, a pressing lever 56, and a torsion spring 57. The shutter blades 58, the number display plate 59, and the like.
[0019]
On the base upper surface 60 of the exposure unit 13, three shafts 61, 62, 64 and a bearing opening 63 are integrally formed with a distance therebetween. A shutter drive lever 54 and a number display plate 59 are inserted into the shaft 63. A torsion spring 57 and a locking lever 55 are inserted into the shaft 61. A pressing lever 56 is inserted into the shaft 62.
[0020]
The shutter drive lever 54 is pivotably rotated between a charge position and a release completion position in contact with the stopper 65, and is urged toward the release completion position by a torsion spring 57. The locking lever 55 is rotated between a winding stop position where the winding pawl 55a engages the tooth row 24a and a winding release position where the winding pawl 55a retracts from the tooth row 24a. Is biased toward the winding stop position.
[0021]
The rotating member 53 is inserted into the bearing opening 64. The rotating member 53 is formed at a position where the pair of pressed portions 66, the pair of shutter charge cams 67, the pair of grooves 68, and the pair of one-tooth gears 69 are rotationally symmetric in order from the bottom. A sprocket 52 that is exposed toward the film surface is connected below the pressed portion 66.
[0022]
The sprocket 52 is provided with two pairs of teeth 70 and 71 which are sequentially meshed with a pair of perforations 50 and 51 arranged at short intervals so as to protrude in a rotationally symmetrical position on the circumferential surface. When the frame is moved by the length of one frame in the direction of the arrow shown in FIG. The sprocket 52 stops after the transfer of one frame of film, with the leading tooth 70 out of the perforation 50 out of the pair of teeth 70, 71 and the subsequent tooth 71 meshing with the perforation 51.
[0023]
When the shutter drive lever 54 is at the release completion position, the rising piece 54 a engages with the falling piece 55 b provided on the locking lever 55 to hold the locking lever 55 at the unwinding release position. When the sprocket 52 rotates counterclockwise following the film transfer, the rotating member 53 also rotates synchronously. As a result of this rotation, the shutter charge cam 67 rotates the shutter drive lever 54 toward the charge position by pushing the one end 54b of the shutter drive lever 54 entering the rotation locus against the bias of the spring 57.
[0024]
While the photographic film 21 is transferred by the length of one frame, the shutter drive lever 54 reaches the charge position. When the shutter drive lever 54 reaches the charge position, the rising piece 54a retreats from the rotation locus of the falling piece 55b and releases the holding of the locking lever 55 at the anti-winding position. As a result, the locking lever 55 is rotated toward the winding stop position by the urging of the torsion spring 57. When the photographic film 21 is transferred by the length of one frame, the groove 68 rotates on the rotation locus of the claw portion 55c of the locking lever 55, and the claw portion 55c enters. As a result, the locking lever 55 is stopped and the rotation of the sprocket 52 is locked. At this time, the winding pawl 55a engages with the tooth row 24a of the winding knob 24 to prevent the film winding operation.
[0025]
While the locking lever 55 is rotating to the winding stop position, the falling piece 55b enters the rotation locus of the rising piece 54a of the shutter drive lever 54, and holds the shutter drive lever 54 at the charge position.
[0026]
When the shutter button 16 is pressed, the falling rod 55d of the locking lever 55 is pressed, and the locking lever 55 rotates toward the anti-winding position against the bias of the torsion spring 57. . As a result, the falling piece 55b deviates from the turning locus of the rising piece 54a, and the shutter drive lever 54 is instantaneously rotated toward the release completion position by the bias of the torsion spring 57. During this rotation, the kicking arm 54c kicks one end 58a of the shutter blade 58. When the shutter blades 58 are kicked off, the shutter blades 58 are rotated from the shielding position that shields the shutter opening 58c around the shaft 58b to the fully opened position that exposes the shutter opening 58c, and then are pulled back to the shielding position by the pull-back spring 58d.
[0027]
When the shutter drive lever 54 rotates to the release completion position, the rising piece 54a enters the rotation locus of the falling piece 55b and holds the locking lever 55 at the anti-winding position. When the locking lever 55 is in the anti-winding position, the winding pawl 55a is retracted from the tooth row 24a, and the pawl portion 55c is pulled out of the groove 68. This allows the next film winding operation.
[0028]
A gear 59 a formed on the outer periphery of the number display plate 59 is meshed with the one-tooth gear 69. Accordingly, when the sprocket 52 is rotated halfway, the one-tooth gear 69 rotates the number display plate 59 clockwise by one scale. On the upper surface of the number display plate 59, a scale for displaying the number is provided corresponding to the rotation pitch. Since this scale is the number of films that can be photographed at that time, that is, a remaining number display scale, the number of remaining frames can be confirmed by observing this scale through the display window 73 formed in the front cover 15.
[0029]
The pair of pressed parts 66 performs an operation for assisting the intermittent rotation of the sprocket 52, and these are provided at rotationally symmetric positions, and the tip 56a of the pressing lever 56 enters the rotation locus. Yes. The pressing lever 56 is formed with a protruding portion 56b, and a pressing portion 54d provided on the shutter drive lever 54 enters the rotation locus of the protruding portion 56b. When the shutter drive lever 54 is at the release completion position, the pressing portion 54d presses the protruding portion 56b using the biasing force of the torsion spring 57. This pressing is applied toward the driven direction of the sprocket 52. Therefore, even if the circumferential surface between the teeth 70 and 71 of the sprocket 52 is opposed to the photographic film 21 and easily slips, the sprocket 52 is surely moved into the film. It can be rotated in the same way as the transfer.
[0030]
Next, the operation of the above configuration will be described. As shown in FIG. 5, the state after the shutter release is stopped when the sprocket 52 is engaged with the perforation 51 among the perforations 50 and 51 in which the teeth 71 are arranged at short intervals. The shutter drive lever 54 is in the release completion position. The pressing lever 56 has a tip 56 a that is inserted between the pair of pressed portions 66.
[0031]
For film winding, the winding knob 24 is rotated in the direction of the arrow shown in FIG. By this operation, the photographic film 21 is wound up. The sprocket 52 rotates counterclockwise following the film transfer at this time. When the teeth 71 are removed from the perforation 51, the tip 56a of the pressing lever 56 presses the pressed portion 66 during this time, and the sprocket 52 rotates following the same movement as the film transfer using this pressing force.
[0032]
Thereafter, the shutter charge cam 67 presses the one end 54b while the subsequent teeth 70, 71 mesh with the next perforations 50, 51 arranged at short intervals, and the shutter drive lever 54 is twisted to bias the spring 57. Rotate to charge position against
[0033]
When the shutter driving lever 54 is rotated to the charging position, the rising piece 54a is retracted from the rotation locus of the falling piece 55b, so that the locking lever 55 is rotated toward the anti-winding position by the urging of the torsion spring 57. To do. When the photographic film 21 is transferred by the length of one frame, the sprocket 52 is in a half-rotated state, so that the claw portion 55c enters the groove 68 as shown in FIG. Becomes the state of the winding stop position.
[0034]
When the locking lever 55 is in the winding position, the rotation of the sprocket 52 is locked, and the winding claw 55a engages with the tooth row 24a to prevent the film winding operation of the winding knob 24. At this time, when the winding knob 24 is further rotated in the film winding direction with an unreasonable force, the winding force applied to the winding knob 24 acts to widen the distance between the rotation center 24 b of the winding knob 24 and the shaft 61. For this reason, the winding pawl 55a may escape from the tooth row 24a and the rotation of the winding knob 24 in the film winding direction may be allowed. In this embodiment, the exposure unit 13 and the cartridge storage chamber 18 Since the locking claw 31 and the locked portion 32 are connected and regulated so that the space between them is not widened, even if the winding knob 24 is further rotated in the film winding direction with an excessive force, further rotation operation is performed. Can be reliably prevented.
[0035]
When the locking lever 55 reaches the winding stop position, the falling piece 55b enters the rotation locus of the rising piece 54a, and the shutter drive lever 54 is held at the charge position. In this state, since the shutter charge cam 67 is retracted from the rotation locus of the one end 54b, the shutter drive lever 54 is allowed to rotate to the release completion position.
[0036]
Shooting is performed by pressing the shutter button 16. With this shutter release, the locking lever 55 is rotated toward the anti-winding position. As a result, the falling piece 55 b retreats from the rotation locus of the rising piece 54 a, so that the shutter drive lever 54 is instantaneously rotated toward the release completion position by the bias of the torsion spring 57. During the rotation, the kicking arm 54c kicks one end 58a of the shutter blade 58 and exposure is performed. When the shutter drive lever 54 rotates to the release completion position, the rising piece 54a enters the rotation locus of the falling piece 55b, and the locking lever 55 is held at the anti-winding position, resulting in the initial state shown in FIG.
[0037]
Thereafter, by repeating the above-described operations, frames are sequentially formed in the film exposure unit, and the exposed photographic film 21 is stored in the cartridge 20. After the shooting of the last frame is completed, the number display plate 59 is rotated to a position for displaying this. At this time, as shown in FIG. 4, a pair of protrusions 59b and 59c formed on the lower surface of the number display plate 59 sandwich the protrusion 55e of the lock lever 55 so that the lock lever 55 is in the unwinding release position. Hold. As a result, since the film winding stop mechanism does not operate, the entire photographic film 21 can be wound inside the cartridge 20.
[0038]
The film unit with lens 10 that has been photographed is directly submitted to the developing station, where the bottom cover 22 is opened. The lid member opening / closing mechanism 35 is operated in conjunction with the opening operation of the bottom lid 22 to close the lid member of the cartridge 20. Thereafter, the cartridge 20 is taken out. The photographic film cartridge 14 can send out the photographic film 21 from the film delivery port 33 by rotating the spool 25 in the film delivery direction after opening the lid member. As a result, the photographic film 21 can be easily developed. After development, printing is performed to obtain a printed photograph. The developed photo film is returned to the original cartridge 20 and returned to the user together with the printed photo.
[0039]
In the above embodiment, the interval regulating member is constituted by the locking claw and the locked portion. However, the present invention is not limited to this, and any connecting member that regulates the interval may be used. The exposure applying mechanism does not necessarily need to be unitized. For example, the exposure applying mechanism may be directly attached to the main body base 11. In this case, it is desirable to provide an interval regulating member on the support portion of the main body base 11 where the exposure imparting mechanism is disposed, for example, the dark box 28 or the like.
[0040]
In the above embodiment, a photographic film in which perforations are formed at two kinds of intervals is adopted. However, the present invention is not limited to this, and a 135 type photographic film with a cartridge may be used. In this case, a known 8-tooth sprocket may be used.
[0041]
【The invention's effect】
As described above in detail, according to the present invention, the exposure unit provided with the winding pawl or the support portion of the main body base to which the exposure unit is attached and the cartridge storage chamber in which the winding knob is arranged are connected. Since the gap regulating member is provided so that the gap between them is not widened , the winding pawl is pulled from the dent row of the winding knob by the winding force applied to the winding knob after film winding is performed. Therefore, the photographic film is not forcibly rolled up, so that the reliability of film winding is improved, and breakage and damage to the perforations and sprockets can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a lens-fitted photo film unit according to the present invention.
FIG. 2 is a cross-sectional view of a film unit with a lens.
FIG. 3 is a perspective view schematically showing a lid member opening / closing mechanism.
FIG. 4 is an exploded perspective view schematically showing a film winding mechanism and the like.
FIG. 5 is an explanatory view showing a film winding mechanism in a state in which the locking lever is in a winding release position, in which a pressed portion, a pressing lever, a sprocket, and the like are shifted upward.
FIG. 6 is an explanatory view showing a film winding mechanism in a state in which the locking lever is in a winding position, in which a pressed portion, a pressing lever, a sprocket, and the like are shifted upward.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Film unit with lens 24 Winding knob 24a Tooth row 28, 29 Dark box 31 Locking claw 32 Locked part 52 Sprocket 55 Locking lever 55a Winding claw

Claims (2)

A main body base provided with a cartridge storage chamber for storing a cartridge on one side across the exposure opening, and a film chamber for storing a film drawn from the cartridge on the other side;
A winding knob which is directed to rotate freely on the cartridge chamber, rotates in the film winding direction when the film is wound, and winds up the photographic film from the film chamber to the cartridge storage chamber ;
An exposure unit that is attached to the front surface of the exposure opening and incorporates at least a photographing lens and a film winding mechanism;
A winding pawl that forms a part of the film winding mechanism and that crosses the space between the exposure unit and the cartridge storage chamber when the photographic film is wound up by a length of one frame is provided on the winding knob. A locking lever for rotating the film from the anti-winding position retracted from the outer periphery to the anti-coiling position engaged with the outer periphery and stopping the film winding direction of the film winding knob. In the unit
An interval regulating member is provided to connect between the cartridge storage chamber and the exposure unit or a support portion of the main body base to which the exposure unit is mounted, and after the film winding is stopped, the winding knob is further rotated in the film winding direction. Thus, the lens-attached film unit is regulated by the interval regulating member so that the space between the cartridge storage chamber and the exposure unit is not expanded by the force applied to the locking lever. One of the cartridge storage chamber and the exposure unit or the support portion is provided with a locking claw that protrudes toward the space, and the other is a latch that is provided on the other side and engages with the locking claw. The film unit with a lens according to claim 1, wherein the gap regulating member is constituted by a stopper.

Images