JP3627993B2 - Film winding device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a film winding apparatus for transferring a photographic film by one frame, and more particularly, a perforation of a specific size is per frame.at leastThe present invention relates to a film winding device used for a photographic film provided one by one.
[0002]
[Prior art]
Conventionally, a film winding device used in a lens-fitted photo film unit transfers 135 types of photographic film defined by international standards by rotating a winding knob, and is continuously provided on the photographic film at a predetermined pitch. 8 sprockets are engaged with the perforations, and when the sprocket is rotated once by the movement of the 8 perforations, the film winding knob is prohibited from rotating and the film winding is stopped during this time. The shutter charge against the biasing of the spring is performed by using the transfer force, that is, the rotational force of the sprocket. Since such a film winding device is configured to mechanically detect the movement of the perforation, the film transfer for one frame can be reliably detected and the sprocket teeth are always engaged with the perforation. Even a shutter charge that resists energization can be performed reliably. In addition, it has the advantage that it can be achieved at a low cost compared with the case where film permeation is stopped while monitoring the passage of perforation with a photo sensor.
[0003]
By the way, Japanese Patent Laid-Open No. 5-19368 proposes a photographic film in which two perforations are formed per frame. These two perforations are provided for each frame at a position corresponding to the top of the frame and a position corresponding to the rear end of the frame, and it is assumed that each frame is shot between these perforations. For this reason, perforations are alternately arranged at two types of intervals, a long interval for determining the length of one frame and a short interval for determining the mutual interval of each frame.
[0004]
[Problems to be solved by the invention]
In order to easily detect such frame-by-frame feeding of a photographic film, the movement of the perforation is monitored by a photo sensor, and the movement of the perforation is detected photoelectrically every other pair, or a pair of lines arranged at either short or long intervals. The perforation movement may be photoelectrically detected. However, in the case of adopting such a method, a circuit for amplifying or shaping the photoelectric signal from the photosensor and the photosensor becomes necessary, and the circuit configuration becomes complicated, so that a low-cost type compact camera is realized. Is unsuitable.
[0005]
In addition, as is done with a simple 110 camera, a detection claw that mechanically displaces by spring bias and enters and exits the perforation, and the detection claw enters the perforation provided at the rear end position of each frame. It is also possible to detect a one-frame advance of the film at the time or when it moves a certain length after entering. However, in such a method, a mechanism for pulling out the detection claw from the perforation is indispensable, and the interlocking mechanism becomes complicated and easily malfunctions, and the detection claw is moved in a direction orthogonal to the film transfer direction. Therefore, it is also disadvantageous in terms of installation space.
[0006]
The present invention has been made in consideration of the above circumstances, and a perforation of a specific size is per frame.at leastProvided is a film winding device that is suitable for a photographic film formed one by one, detects a single frame feed by the rotation of a sprocket driven by the transfer of the photographic film, and performs a shutter charge during this rotation. The purpose is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object,Film winding deviceThenUsing the shutter charge force, the sprocket is biased in the driven direction along the film transfer direction until the sprocket teeth come off the perforation and mesh with the next perforation.An urging means is provided. On the sprocket, at least one tooth that meshes with the perforation protrudes from the sprocket surface. According to this, after the teeth are removed from the perforation along with the film transfer, the biasing means urges and rotates to the standby position immediately before engaging the next perforation until the next perforation arrives. Film transfer is allowed while slipping on the tooth surface of the teeth.
[0008]
In the film winding device according to claim 2, in the film winding device according to claim 1, the sprocket has a shape in which each tooth protrudes at a position 180 degrees apart on the circumferential surface. While the film is being transferred, it is rotated halfway in the driven direction along the transfer direction, and during this time, after the preceding tooth is removed from the perforation, it is biased and rotated in the driven direction by the biasing means. The transfer of the photographic film is allowed while slipping on the tooth surface until the subsequent tooth engages with the next perforation after the teeth of the wing are in contact with the photographic film and the energizing rotation is prohibited. At the same time, the transfer means for transferring the photographic film in the film winding direction after the photographing is completed, and the rotation is used against the spring bias by using this rotation while the sprocket is rotated halfway. The shutter drive lever that is moved to the position and the sprocket is moved halfway to the winding position where the shutter drive lever is held at the charge position to prevent the transfer means from being transferred, and the winding is interlocked with the shutter release. And a locking lever that releases the blocking of the transfer means after being moved to the stop releasing position and releasing the holding of the shutter drive lever at the charging position.
[0009]
[Action]
When the photographic film is transferred in the film winding direction by the transfer means, the sprocket is rotated halfway. This rotation is performed using the transfer force of the photographic film while the preceding tooth of the two teeth is engaged with the perforation, and the tooth is removed from the perforation and the subsequent tooth is moved to the next perforation. Until it is engaged with the motor, it is rotated by the urging force of the urging means. Since this energizing rotation is performed instantaneously, the photographic film has not yet been transferred by the length of one frame, and therefore, the subsequent teeth come into contact with the photographic film and the energizing rotation of the sprocket is prohibited. During this time, the transfer of the photographic film by the transfer means continues, so that after the sprocket rotation is prohibited, the photographic film remains on the tooth surface until this subsequent tooth engages with the next perforation. It is transferred while slipping.
[0010]
After that, the sprocket is rotated by utilizing the transfer force of the photographic film when the subsequent teeth mesh with the next perforation. During this time, the shutter drive lever is moved to the charging position, and when the half-turn is made, the locking lever Moves to the winding stop position, holds the shutter drive lever in the charge position, and prevents the transfer means from transferring. Then, in conjunction with the shutter release, the locking lever is moved to the winding release position, the transfer block of the transfer means is released, and the next film winding can be performed.
[0011]
According to a third aspect of the present invention, there is provided a film winding apparatus that winds up a photographic film one frame at a time so that the center of the perforations having long intervals among the perforations alternately arranged at two types of intervals is aligned with the center in the longitudinal direction of the exposure position. In the sprocket of this device, when a pair of perforations arranged at short intervals move, two pairs of teeth that sequentially engage with each other are located at positions 180 ° apart on the circumferential surface. Projected. The biasing means drives the sprocket between a pair of teeth of the sprocket, the preceding pair of teeth being detached from the pair of perforations, and the subsequent pair of teeth engaging the next pair of perforations. Energize in the direction.
[0012]
By the way, the shutter drive lever that is moved to the charge position by using the rotation of the sprocket is performed against the bias of the spring. When the biasing force of the spring is larger than the biasing force of the biasing means, the sprocket teeth are not engaged with the perforations, that is, while the sprocket is rotated by the biasing force of the biasing means. If shutter charging is performed, the sprocket may not rotate. Therefore, it is desirable that the timing for moving the shutter drive lever to the charge position is performed while the sprocket teeth are engaged with the perforations. In addition, according to the third aspect of the present invention, since the pair of teeth are engaged with the pair of perforations, the range in which the sprocket rotates using the transfer force of the photographic film in a half rotation is wide. Therefore, it is preferable.
[0013]
As a photographic film, claims8As described above, two large and small perforations having different sizes may be formed per frame. In this case, as a pair of teeth on the sprocketIsA small tooth engaging a small perforation and a large tooth engaging a large perforationConsists ofIt is desirable to do. Moreover,As claimed in claim 9,By forming the large teeth elastically, even if the small teeth are shifted to large perforations and meshed, the next large teeth abut against the photographic film and dents, allowing sprocket rotation. Only needs one frame.
[0014]
As a biasing means,Consists of a protrusion protruding on the circumferential surface that rotates integrally with the sprocket, and a leaf spring that presses the protrusion in the driven direction of the sprocket.May be. According to this,Since it is only necessary to provide a protrusion and a leaf spring provided on the circumferential surface, such a large space is not required, and it can be achieved at low cost. Further, as another urging means, the claims5 to 7As described, the sprocket may be formed by notching a part of the sprocket to be elastically provided, and a pressing portion that elastically deforms the tooth and presses the sprocket in the driven direction.
[0015]
It should be noted that the one-frame transfer of the photographic film is preferably completed when the sprocket teeth are securely meshed with the perforations so that the photographic film does not move during shutter release.
[0016]
【Example】
Hereinafter, the film winding apparatus of the present invention will be described based on an embodiment in which the film winding apparatus is applied to a lens-fitted film unit. As shown in FIG. 1, a film unit with a lens (hereinafter referred to as “film unit”) 10 includes an outer case 11 and a unit main body 12. The outer case 11 includes a photographing lens 13 and a shutter button. 14, an opening for exposing the winding knob 15, the finder window 16, the number-of-photographs display window 17 and the like to the outside is formed.
[0017]
As shown in FIG. 2, the unit body 12 includes a body base 18, a rear cover 19, an exposure unit 20, and a front cover 21.
[0018]
An exposure unit 20 is detachably attached to the front surface of the main body base 18. The exposure unit 20 incorporates an exposure applying mechanism including a photographic lens 13, a film winding mechanism, a shutter charge mechanism, and the like, and these are unitized. The rear cover 19 is detachably attached to the back of the main body base 18 and stores the photographic film 22 with a cartridge in a light-tight manner between the rear cover 19 and the main body base 18.
[0019]
The front cover 21 is detachably attached to the front surface of the main body base 18. On the upper surface of the front cover 21, there is provided a shutter button 14 that is formed by being cut out and elastically formed. A pressing rod 23 is provided below the shutter button 14, and a locking lever 44, which will be described in detail later, is pressed to operate the exposure imparting mechanism.
[0020]
The main body base 18 is integrally formed with a cartridge storage chamber 25 for storing the cartridge 24 and a film roll chamber 27 for storing the unexposed photographic film 26 pulled out from the cartridge 24 in the form of a film roll 26a. Has been. In this embodiment, the film roll 26a is wound around the core 28. The upper and lower ends of the winding core 28 are rotatably supported inside the film roll 26 a by a pair of forks 29 and 30 provided on the rear cover 19. Note that the film mur 26 a from which the core 28 is omitted may be stored in the film roll chamber 27. In this case, the fork 29 can be omitted.
[0021]
The bottoms of the cartridge storage chamber 25 and the film roll chamber 27 are opened, and after being loaded with the photographic film 22 with a cartridge, they are closed by pull-top type bottom covers 31 and 32 provided on the rear cover 19, respectively.
[0022]
A dark box 33 is provided between the cartridge storage chamber 25 and the film roll chamber 27. An exposure opening is formed on the back side of the dark box 33. The exposure aperture has a curved shape centered on the optical axis 13a passing through the photographing lens 13 together with the film surface passing therethrough. Further, a film support surface 34 is formed on the rear cover 19 at a portion facing the film surface. The film support surface 34 is also curved in the same manner as the film surface. The dark box 33 may be provided on the exposure unit 20 side. Alternatively, the dark box 33 may be formed by dividing the dark box 33 and providing a part to the exposure unit 20, the other part to the main body base 18, and the exposure unit 20 to the main body base 18.
[0023]
On the front side of the dark box 33, an opening 34 for guiding subject light transmitted through the photographing lens 13 to the exposure opening is formed. In addition, an opening 33 a for exposing a sprocket, which will be described later in detail, toward the photographic film 26 is formed above the dark box 33. The opening 33a is formed on the upper left side with respect to the exposure opening viewed from the photographing lens 13 side.
[0024]
The winding knob 15 is rotatably disposed on the upper surface of the cartridge housing chamber 25 and engages with the spool 35 of the cartridge 24. A part of the winding knob 15 is exposed from the opening 36 of the rear cover 19, and the spool 35 is wound up by rotating the exposed part in the film winding direction (counterclockwise direction shown in the figure). The photograph film 26 that has been photographed by rotating in the direction is stored in the cartridge 24.
[0025]
A tooth row 15 a is formed on the outer periphery of the winding knob 15. A check claw 37 provided on the main body base 18 is engaged with the tooth row 15a. The check pawl 37 prohibits the winding knob 15 from being rotated in a direction opposite to the film winding direction (clockwise direction shown in the figure).
[0026]
In the photographic film 26, the rear end of the photographic film 26 is locked to the spool 35. As shown in FIG. 3, the photographic film 26 includes a film front end portion 26b, a film exposure portion 26c, and a film rear end portion 26d. . In the film exposure section 26c, two large and small perforations 39 and 40 having different sizes are alternately arranged along one side edge at two intervals, and the center between the long-perforations 39 and 40 is long. Is exposed to the center of the exposure opening in the film feeding direction (longitudinal direction), and a frame 38 is formed.
[0027]
This photographic film 26 is processed so that a commercially available photographic film in which two perforations of the same size used for frame positioning in a general camera are formed per frame is used exclusively for the film unit 10. The processing increases the size of the perforation on the film winding direction (arrow direction shown in the figure) side of the film unit 10 with respect to the frame 38 when viewed from the emulsion surface side.
[0028]
During this processing, large and small perforations 39a and 40a are placed next to the frame 38a on the film leading end 26b side (the last frame in the film unit 10) and the frame 38b on the film trailing end 26d side (the first frame in the film unit 10), respectively. One by one, large and small perforations 39, 40 arranged at short intervals are always paired. The large perforation 39a at the film leading end 26b is obtained by processing a perforation previously formed on a commercially available photographic film, and the small perforation 40a at the film rear end 26d is formed on the commercially available photographic film. It is not a new one.
[0029]
Thus, in the photographic film 26 used exclusively for the film unit 10, the large perforations 39 are arranged at the upper left of the frame 38 when viewed from the emulsion surface side, that is, on the film winding direction side with respect to the frame 38. The large perforation 39 has a longer length along the film feeding direction than the small perforation 40. The other small perforations 40 are arranged on the upper right side of the frame 38, that is, on the opposite side of the film winding direction with respect to the frame 38, and naturally the length along the film feeding direction is shorter than the large perforation 39. Yes. Both perforations 39 and 40 have the same length in the film width direction.
[0030]
The exposure unit 20 is provided with a film counter mechanism in addition to the exposure applying mechanism, the film winding stop mechanism, and the shutter charge mechanism. 4 and 5, the mechanism includes a sprocket 41, a rotating member 42, a shutter drive lever 43, a locking lever 44, a leaf spring 45, a torsion spring 46, a shutter blade 47, and a number display plate. 55 and so on.
[0031]
Two shafts 53 and 54 and a bearing opening 49 are integrally formed on the upper surface of the base plate 48 of the exposure unit 20. A shutter drive lever 43 and a number display plate 55 are inserted into the shaft 53 in order. On the other hand, the torsion spring 46 and the locking lever 44 are sequentially inserted into the shaft 54.
[0032]
The rotating member 42 is inserted into the bearing opening 49. In the rotating member 42, a pressed portion 50, a shutter charge cam 51, a winding stop cam 52, and a two-tooth gear 56 are integrally formed in order from the bottom. A sprocket 41 exposed from the opening 33a toward the film surface is connected to the lower side of the pressed portion 50.
[0033]
In the sprocket 41, a pair of large and small teeth 41a and 41b that sequentially mesh with a pair of perforations 39 and 40 arranged at short intervals are positioned 180 degrees apart on the circumferential surface 41c, that is, rotationally symmetric positions. Two pairs are projected and half-rotated following the film transfer for one frame. The length of the circumferential surface 41c is preferably the same as or shorter than the length of one frame of the photographic film 26. The driven direction of the sprocket 41 is the counterclockwise direction shown in FIG.
[0034]
The large teeth 41 a have a length in the film feeding direction longer than that of the small perforations 40 and slightly shorter than the large perforations 39, and mesh only with the large perforations 39. The small teeth 41 b are sized to mesh with the small perforations 40. The one-frame transfer of the photographic film 26 is completed with the small teeth 41b out of the small perforations 40 and the large teeth 41a meshing with the large perforations 39.
[0035]
The pressed portion 50 is formed with a pair of ridge protrusions 50a at positions 180 degrees apart on the circumferential surface, that is, at rotationally symmetric positions, and a leaf spring 45 is urged on the circumferential surface. ing. The leaf spring 45 is pushed and elastically deformed by the protrusion 50a while any one of the pair of teeth 41a and 41b of the sprocket 41 is engaged with the perforations 39 and 40 having a short interval. The sprocket 41 is allowed to rotate, and the protrusion 50a is pushed until the subsequent tooth 41b engages with the next perforation 40 after the pair of teeth 41a and 41b is disengaged from the short-perforations 39 and 40. 41 is urged in the driven direction.
[0036]
One end 46a of the torsion spring 46 is engaged with a spring receiving portion 43a (see FIG. 5) of the shutter drive lever 43, and the shutter drive lever 43 is rotated counterclockwise (release completion position) about the shaft 53. It is energizing towards. The other end 46b of the torsion spring 46 is engaged with the falling piece 44a of the locking lever 44, and urges the locking lever 44 clockwise (winding position) about the shaft 54. Yes. The shutter charge cam 51 is formed with a pair of cams 51a at positions separated by 180 °, that is, rotationally symmetric positions, and one end 43b of the shutter drive lever 43 faces the rotation locus. . The cam 51a twists the shutter drive lever 43 while the sprocket 41 makes a half rotation, and rotates it in the clockwise direction (charge position) against the bias of the spring 46.
[0037]
When the film transfer for one frame is performed, the rotating member 42 rotates counterclockwise halfway. In this half rotation, the claw portion 44b of the locking lever 44 is fitted into one of the pair of grooves 52a provided at a position 180 ° apart from the outer periphery of the locking cam 52, that is, at a rotationally symmetric position. The rotation of the sprocket 41 is locked. This state becomes the winding stop position of the locking lever 44. In the middle of the rotation of the locking lever 44 to the locking position, the lower protrusion 44c of the locking lever 44 enters the rotation locus of the rising piece 43c of the shutter driving lever 43, and the shutter driving lever 43 is moved to the charging position. Hold on. Further, when the locking lever 44 is rotated to the winding stop position, the winding pawl 44d engages with the tooth row 15a on the outer periphery of the winding knob 15 to prohibit the film winding operation.
[0038]
The pair of cams 51a is associated with the pair of teeth 41a and 41b of the sprocket 41 and the pair of perforations 39 and 40 as the timing for rotating the shutter drive lever 43 to the charging position against the bias of the torsion spring 46. If it is performed when not engaged, the sprocket 41 may not be urged and rotated in the driven direction even by the urging force of the leaf spring 45, so the pair of teeth 41 a and 41 b mesh with the pair of perforations 39 and 40. During this time, the shape is determined so that the shutter drive lever 43 is rotated toward the charge position.
[0039]
By pressing the shutter button 14, the pressing rod 23 presses the falling piece 44a of the locking lever 44, and the locking lever 44 is rotated in the counterclockwise direction (anti-winding release position). By this rotation, the lower protrusion 44c of the locking lever 44 is removed from the rotation locus of the rising piece 43c of the shutter drive lever 43. As a result, the shutter drive lever 43 is rotated counterclockwise about the shaft 53 by the bias of the torsion spring 46. This rotation ends when the kicking arm 43d comes into contact with the stopper 58. This state is the release completion position of the shutter drive lever 43. During the rotation, the kicking arm 43d kicks the shutter blade 47.
[0040]
Further, when the shutter drive lever 43 rotates to the release completion position, the rising piece 43c enters the rotation locus of the lower protrusion 44c of the locking lever 44, and holds the locking lever 44 at the anti-winding position. When the locking lever 44 is in the anti-winding position, the anti-winding pawl 44d is retracted from the tooth row 15a, and the pawl portion 44b is retracted from the groove 52a. This allows the next film winding operation.
[0041]
A shaft 59 is formed on the front surface of the base plate 48 in parallel with the optical axis 13a. A shutter blade 47 is pivotally attached to the shaft 59 so as to be swingable. The shutter blade 47 swings one reciprocation between a position where the shutter opening 61 provided on the optical axis 13 a is shielded by the urging of the pull-back spring 60 and a position where the shutter opening 61 is exposed by kicking the shutter drive lever 43. To do.
[0042]
The two-tooth gear 56 is engaged with a gear 55 a formed on the outer periphery of the number display plate 55. Accordingly, when the sprocket 41 is rotated halfway, the number display plate 55 is rotated clockwise by one scale by one tooth of the two-tooth gear 56. On the upper surface of the number display plate 55, 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, the remaining number display scale, the number of remaining frames can be confirmed by observing this scale through the display window 17.
[0043]
Note that it is necessary to wind up the entire photographic film 26 in the cartridge 24 by the film winding operation after the last frame 38 has been shot. For this reason, a pair of cams 55b and 55c are formed on the lower surface of the number display plate 55, and the rising protrusion of the locking lever 44 is interposed between the cams 55b and 55c in the film winding operation process after the last frame 38a is photographed. 44e enters. When the locking lever 44 is in such a state, the claw portion 44b is retracted from the groove 52a, the locking claw 44d is retracted from the tooth row 15a, and the lower protrusion 44c is the shutter drive lever 43. It enters into the rotation trajectory of the rising piece 43c and is held at the film storage allowable position for holding the shutter drive lever 43 at the charge position.
[0044]
Next, the operation of the above configuration will be described. As shown in FIG. 5, the state at the end of photographing is a state in which the small teeth 41 b of the pair of large and small teeth 41 a and 41 b of the sprocket 41 are disengaged from the perforation 40 and the large teeth 41 a are engaged with the perforation 39. At this time, the pressed part 50 is in a state immediately before one of the protrusions 50 a elastically deforms the leaf spring 45. Also, the shutter drive lever 43 holds the locking lever 44 in the anti-winding position by the rising piece 43c entering the turning locus of the lower protrusion 44c of the locking lever 44.
[0045]
When the film winding operation is performed by rotating the winding knob 15 counterclockwise, the photographic film 26 is transported in the film winding direction. The sprocket 41 is rotated counterclockwise following the film transfer. The rotation using the film transfer is performed while the large teeth 41 a are engaged with the large perforations 39. During this time, as shown in FIG. 6, the protrusion 50 a of the pressed portion 50 rotates while pressing the leaf spring 45 to be elastically deformed. When the large teeth 41a are disengaged from the large perforations 39, the protrusions 50a are in the state indicated by the solid line in FIG. In this state, the leaf spring 45 urges the slope of the protrusion 50a counterclockwise. For this reason, after the large teeth 41 a are disengaged from the large perforations 39, the sprocket 41 rotates in the driven direction using the biasing force of the leaf spring 45.
[0046]
This rotation is performed until the small teeth 41b of the following pair of large and small teeth 41b and 41a reach the photographic film 26, and are in the state indicated by the dotted lines shown in FIG. During this time, since the urging force of the leaf spring 45 is used instantaneously, the transfer of the photographic film 26 has not reached one frame, and therefore the next small perforation 40 has not yet reached. For this reason, the rotation of the sprocket 41 is temporarily stopped when the tooth surface of the small teeth 41 b comes into contact with the photographic film 26. While the rotation of the sprocket 41 is stopped, the photographic film 26 is transferred while slipping between the tooth surface of the small teeth 41b and the circumferential surface 41c. It should be noted that there is no problem because the portion where the tooth surface of the small tooth 41b contacts the photographic film 26 is outside the photographing screen.
[0047]
By the subsequent film winding operation, the small perforation 40 is transferred toward the sprocket 41, and when the small teeth 41b mesh with the small perforation 40 as shown in FIG. 7, the sprocket 41 again uses the transfer force of the photographic film 26. And rotate in the driven direction. Since the leaf spring 45 pushes the protrusion 50a until the small teeth 41b are securely engaged with the small perforations 40, the small teeth 41b and the small perforations 40 are reliably engaged. As shown in FIG. 8, when the small teeth 41 b are engaged with the small perforations 40, the protrusions 50 a are rotated away from the leaf springs 45, so that the sprocket 41 is biased by the leaf springs 45. finish.
[0048]
When the small teeth 41b mesh with the small perforations 40, one cam 51a pushes up one end 43b and rotates the shutter drive lever 43 toward the charging position around the shaft 53. While the shutter drive lever 43 is rotating toward the charging position, the rising piece 43c is kept in the rotation locus of the lower protrusion 44c, so that the locking lever 44 is released from being unwound. It is in a state of being held in position.
[0049]
When the shutter drive lever 43 reaches the charge position, the rising piece 43c is retracted from the rotation trajectory of the lower protrusion 44c, so that the holding of the locking lever 44 at the unwinding release position is released. As a result, the locking lever 44 rotates toward the winding stop position by the urging of the torsion spring 46. During this rotation, the lower protrusion 44c enters the turning locus of the rising piece 43c, so that the locking lever 44 holds the shutter drive lever 43 in the charge position.
[0050]
When the photographic film 26 is transferred by the length of one frame, as shown in FIG. 9, the sprocket 41 is rotated halfway, and the rotating member 42 is also rotated halfway along with this rotation. When the rotating member 42 is rotated halfway, the claw 44b of the locking lever 44 is fitted into the groove 52a of the locking cam 52, and the locking lever 44 is rotated to the winding position. Accordingly, the rotation of the sprocket 41 is prohibited, and the winding pawl 44d is engaged with the tooth row 15a on the outer periphery of the winding knob 15, so that the film winding operation is also prohibited.
[0051]
During the rotation until the locking lever 44 reaches the winding stop position, the lower protrusion 44c is performed while entering the rotation locus of the rising piece 43c of the shutter drive lever 43. Therefore, the shutter drive lever 43 Is held at the charge position. Note that, by half rotation of the sprocket 41, one tooth of the two-tooth gear 56 advances the number display plate 55 by one scale.
[0052]
Shooting is performed by pressing the shutter button 14. By this operation, the pressing rod 23 provided at the lower part of the shutter button 14 presses the falling piece 44a in the direction of arrow B shown in FIG. By this pressing, the locking lever 44 is rotated counterclockwise, that is, toward the anti-winding position against the bias of the torsion spring 46. By the rotation of the locking lever 44, the lower protrusion 44c is retreated from the turning locus of the rising piece 43c, and the shutter drive lever 43 is instantaneously rotated to the release completion position by the urging of the torsion spring 46, The state shown in FIG. 5 is obtained.
[0053]
During the rotation of the shutter drive lever 43 toward the release completion position, the kicking arm 43d kicks the shutter blade 47. Due to the kicking, the shutter blade 47 swings around the shaft 59 once and twice. During this double swing, the subject light transmitted through the photographing lens 13 is incident on the photographic film 26 set in the exposure aperture to perform exposure. When the shutter drive lever 43 moves to the release completion position, the rising piece 43c enters the rotation locus of the lower protrusion 44c and holds the locking lever 44 at the unwinding release position.
[0054]
Thereafter, shooting is sequentially performed by repeating the above-described operation. Even after the last frame 38a of the photographic film 26 has been shot, the state shown in FIG. By subsequent film winding operation, the shutter drive lever 43 is rotated toward the charge position. When the shutter drive lever 43 rotates to the charging position, the holding of the locking lever 44 at the anti-winding release position is released, and the locking lever 44 rotates toward the anti-winding position by the urging of the torsion spring 46.
[0055]
In the middle of this rotation, the lower protrusion 44c enters the turning locus of the rising piece 43c, and the locking lever 44 holds the shutter drive lever 43 in the charge position. During this time, since the two-tooth gear 56 is rotated integrally with the sprocket 41 by the transfer of the photographic film 26, the number display plate 55 also advances by one scale, and “0” is displayed on the number-of-photograph display window 17. . The cam 55b enters the rotation locus of the rising protrusion 44e of the locking lever 44 by the last one step of the number display plate 55, and the locking protrusion 44e is sandwiched between the cams 55b and 55c. 44 is held at the film storage allowable position.
[0056]
In this state, the claw portion 44b is retracted from the groove 52a and the sprocket 41 is free to rotate, and the winding pawl 44d is retracted from the tooth row 15a of the winding knob 15 to allow the film winding operation. Furthermore, the locking lever 44 remains in the state where the shutter driving lever 43 is held at the charging position. As a result, even if the perforation 39a formed next to the last frame 38a is transferred, the film winding stop does not operate, and therefore, no exposure is performed except for the film exposure unit 26b.
[0057]
Thereafter, a portion where the perforations 39 and 40 are not formed, that is, the film leading end portion 26b where the perforations 39 and 40 are not arranged passes through the position of the sprocket 41. At this time, the sprocket 41 is in a state indicated by a dotted line in FIG. 6, that is, the large tooth 41a of the pair of preceding teeth 41a and 41b is detached from the perforation 39, and the small tooth 41b of the pair of subsequent teeth 41a and 41b. The tooth surface comes into contact with the film leading end portion 26b to allow slip transfer of the photographic film 26. As a result, the entire photographic film 26 can be securely stored inside the cartridge 24.
[0058]
Note that if the shutter button 14 is pressed during the film winding operation after the last photographing is finished, the locking lever 44 tries to rotate toward the winding release position, but the cam 77b is locked. Therefore, the shutter drive lever 43 is not released from being held at the charge position.
[0059]
The film unit 10 that has been photographed is directly submitted to the development office. At the developing station, the lid 31 of the rear cover 19 is opened, the cartridge 24 is taken out, and the photographed photographic film 26 is developed and printed as usual. After performing the processing in this way, the print photograph and the negative film are returned to the user. The empty film unit 10 is collected and recycled at the factory. In FIGS. 5 to 9 described in the above embodiment, the axes of the sprocket 41 and the pressed portion 50 are shifted along the alternate long and short dash line in order to prevent complication of the drawings. 6 to 9, the torsion spring 46 is omitted in order to prevent the drawings from becoming complicated.
[0060]
In the above embodiment, when the film transfer for one frame is completed, the rotation of the sprocket 41 is completed with the teeth 41a meshing with the perforations 39. However, the present invention is not limited to this, and the teeth 41b are not limited thereto. The film transfer for one frame may be completed in a state in which the teeth 41a and 41b are not engaged with the perforations 39 and 40. However, in order to keep the photographic film 26 from moving during the shutter release, it is preferable to have the teeth engaged with the perforations.
[0061]
In the above embodiment, during one frame transfer of the photographic film 26, either one of the two protrusions 50a is pressed by the leaf spring 45 to urge the sprocket 41 in the driven direction. Not limited to this, instead of the leaf spring 45, as shown in FIG. 10, a sprocket is used by utilizing the force of the torsion spring 46 for charging that biases the shutter drive lever 43 toward the release completion position. A pressing lever 70 that biases and rotates the motor in the driven direction may be provided.
[0062]
As shown in FIG. 10, the pressing lever 70 is rotatably supported by a shaft 71 provided on the base plate 48 so that the tip 70 a faces the rotation trajectory of the pair of protrusions 50 a of the pressed part 50. . The pressing lever 70 is integrally provided with a protrusion 70b. The shutter drive lever 43 includes a spring receiving portion 43a, one end 43b facing the rotation trajectory of the shutter charge cam 51, a rising piece 43c, and a kicking arm 43d, as well as a pressing piece facing the rotation trajectory of the protrusion 70b. 43e is provided integrally.
[0063]
In the sprocket 72, two pairs of large and small teeth 72a and 72b are provided in two rotationally symmetrical positions as in the above-described embodiment. Among these, the large teeth 72a are partly cut out and are elastic in the direction of entering the inside.
[0064]
In the state after the shutter release, as shown in FIG. 11, the sprocket 72 is stopped with the large teeth 72 a meshing with the perforation 39. The shutter drive lever 43 is in the release completion position. In this state, the kicking arm 43 d is in contact with the stopper 58 against the biasing force of the torsion spring 46. The pressing lever 70 is free because the urging force of the pressing piece 43e does not act on the ridge 70b.
[0065]
When the film winding operation is performed, the sprocket 72 is rotated counterclockwise following the transfer of the photographic film 26, and the large teeth 72a are removed from the perforation 39 as shown in FIG. During this time, the shutter drive lever 43 is rotated toward the charge position. However, since this rotation is slight, the shutter drive lever 43 does not get over the kicked portion of the shutter blade 47a. At this time, the protrusion 50a of the pressed portion 50 is rotated to a position where the tip 70a of the pressing lever 70 contacts the tooth surface opposite to the rotation direction.
[0066]
Since the sprocket 72 is in a state where the large teeth 72a are removed from the perforation 39, the sprocket 72 is not rotated by the transfer force of the photographic film 26, but the tip 70a abuts against the tooth surface on the opposite side to the rotation direction of the projection 50a. It rotates counterclockwise by the urging force of the pressing lever 70. The pressing lever 70 is biased by using the force of the torsion spring 46 that biases the shutter driving lever 43 toward the release completion position via the pressing piece 43e and the protrusion 70b. Yes.
[0067]
Thereafter, the tooth surface of the subsequent tooth 72a comes into contact with the photographic film 26, whereby the rotation of the sprocket 72 is temporarily stopped. While the sprocket 72 is stopped, the photographic film 26 is transferred while slipping between the circumferential surface and the tooth surface of the sprocket 72. During this time, the urging of the pressing lever 70 is continued. As shown in FIG. 13, when the next perforation 40 arrives, the subsequent small teeth 72 a can smoothly mesh with the perforation 40.
[0068]
When the small teeth 72a mesh with the perforation 40, as shown in FIG. 14, the urging of the pressing lever 70 to the projection 50a is completed, and thereafter the sprocket 72 is counterclockwise using the transfer force of the photographic film 26. Rotate in the direction. At this time, the cam 51a of the shutter charge cam 51 contacts the one end 43b, and the shutter drive lever 43 is rotated toward the charge position against the bias of the torsion spring 46.
[0069]
The transfer of the photographic film 26 is continued, and the cam 51a rotates the shutter drive lever 43 to the charge position immediately before the large teeth 72b mesh with the perforation 39. As a result, the rising piece 43c retreats from the rotation trajectory of the lower protrusion 44c, so that the locking lever 44 rotates toward the winding stop position. When the photographic film 26 is transferred by the length of one frame, the sprocket 72 is in a half-rotated state, so that the claw portion 44b enters the groove 52a and the locking lever 44 as shown in FIG. Becomes the state of the winding stop position.
[0070]
When the locking lever 44 is rotated to the winding stop position, the rotation of the sprocket 72 and the film winding operation of the winding knob 15 are prohibited, and the lower protrusion 44c enters the rotation locus of the rising piece 43c. The drive lever 43 is held at the charge position. In this state, since the cam 51a is retracted from the rotation locus of the one end 43b, the shutter drive lever 43 is allowed to rotate to the release completion position.
[0071]
When the locking lever 44 is rotated toward the anti-winding position by the shutter release, the shutter drive lever 44 is instantaneously rotated toward the release completion position as shown in FIG. Since the kicking arm 43d kicks the kicking portion 47a by the rotation during this time, exposure is performed. Thereafter, the kicking arm 43d comes into contact with the stopper 58 to stop the rotation of the shutter drive lever 43, and the release completion position is reached. At this time, since the kicking arm 43d contacts the stopper 58 immediately before the pressing piece 43e contacts the protrusion 70b of the intermediate lever 70, the sprocket 72 is not urged in the driven direction. Since the photo film 26 is not blurred, a clear image can be imprinted.
[0072]
By the way, in the sprocket 41 of the embodiment described with reference to FIGS. 4 to 9, if the small tooth 41 b meshes with the next large perforation 39 without meshing with the small perforation 40, the next large tooth 41 a becomes the photographic film 26. While the sprocket 72 described with reference to FIGS. 11 to 15 has the disadvantage that the film cannot be wound up due to interference, the sprocket 72 is elastically deformed in the direction in which the large teeth 72a are recessed when contacting the photographic film 26. Since 72 can rotate in the driven direction, there is an advantage that a frame feed error can be shortened by one frame.
[0073]
Further, as shown in FIGS. 16 and 17, a tooth 80a that is elastically provided by cutting out a part of the sprocket 80, and a pressing portion 81 that elastically deforms the tooth 80a and presses the sprocket 80 in the driven direction. It may be composed of The sprocket 80 is provided with two pairs of small teeth 80b and large teeth 80a that are sequentially engaged with the perforations 39 and 40 with short intervals on the circumferential surface separated by 180 °. Of these, the large teeth 80a are elastic. When molding such a sprocket 80, it is desirable to use engineer plastic materials such as ABS, PP, POM, PBT, PMMA, PC, PA, and liquid crystal polymer.
[0074]
The pressing portion 81 is provided so as to protrude from the inner wall 82 that rotatably supports the sprocket 80. The pressing portion 81 includes a wall 81a that elastically deforms the large teeth 80a while the pair of leading teeth 80a and 80b of the two pairs of teeth 80a and 80b of the sprocket 80 mesh with the pair of perforations 39 and 40; Thereafter, the elastic force is used to return the deformed state to the original state after the large tooth 80a is disengaged from the perforation 39 until the small tooth 80b of the subsequent pair of teeth 80a and 80b is engaged with the next perforation 40. And a wall 81b for urging the sprocket 80 in the driven direction.
[0075]
In the above embodiment, an example in which the film winding device is used for the lens-fitted film unit in which the photographic film is loaded in advance is used. However, the present invention is not limited to this, and the present invention can be applied to a general camera. Some cameras automatically perform a film winding operation. In this case, the spool 35 is rotated by the motor instead of the winding knob 15 after the shutter release is completed, and the load applied to the motor is detected by the rotation lock of the sprocket 41 so as to stop the rotation of the motor. Is desirable.
[0076]
In the above embodiment, the photographic film 26 is provided with two perforations 39, 40 having different sizes per frame. However, the present invention is not limited to this, and one large perforation and a plurality of small perforations per frame. It can also be used for photographic films provided with perforations. Also, a photographic film provided with one perforation per frame may be used. In these cases, the shape and number of sprocket teeth may be determined in accordance with the shape and number of perforations.
[0077]
Further, the shape of the large and small perforations may be a shape with different lengths in the film width direction. In addition to different sizes, for example, round or triangular shapes may be used. Further, it can be used for a photographic film in which two perforations 39 and 40 arranged in one frame are the same size. In these cases, it goes without saying that the shape of the sprocket teeth is changed according to the shape of the perforation.
[0078]
【The invention's effect】
As described above, in the present invention, while the sprocket teeth are engaged with the perforation, the sprocket is rotated using the transfer force of the photographic film, and the teeth are detached from the perforation and engaged with the next perforation. In the meantime, since the sprocket is urged and rotated by the urging means, the film winding device for photographic film in which at least one perforation of a specific size is formed per frame is inexpensive. Moreover, it is advantageous in terms of installation space.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external appearance of a lens-fitted photo film unit.
FIG. 2 is an exploded perspective view of a unit main body.
FIG. 3 is a schematic explanatory view showing a photographic film with a cartridge.
FIG. 4 is an exploded perspective view showing an outline of a film winding mechanism.
FIG. 5 is an explanatory diagram of a film winding mechanism showing a state after the shutter release is completed.
FIG. 6 is an explanatory view of a film winding mechanism showing a state where large teeth are out of perforation.
FIG. 7 is an explanatory diagram of film winding showing a state in which the next small teeth mesh with perforation.
FIG. 8 is an explanatory diagram of a film winding mechanism showing a state in which shutter charging is performed.
FIG. 9 is an explanatory diagram of a film winding mechanism showing a state in which a photographic film is rolled up by one frame.
FIG. 10 is an exploded perspective view showing another embodiment in which the sprocket is urged and rotated in the driven direction using the force of a spring that urges the shutter drive lever to the release completion position.
FIG. 11 is an explanatory diagram illustrating a state after the shutter release of the embodiment described in FIG. 10;
12 is an explanatory diagram showing a state in which the sprocket of the embodiment described in FIG. 10 is urged and rotated. FIG.
13 is an explanatory view showing a state in which the urging rotation of the sprocket of the embodiment described in FIG. 10 is completed.
14 is an explanatory diagram showing a state during shutter charging of the embodiment described in FIG. 10;
15 is an explanatory diagram showing a state after completion of shutter charging in the embodiment described in FIG. 10;
FIG. 16 is a plan view showing another embodiment using a sprocket having elastic teeth.
FIG. 17 is a plan view showing a pressing portion that elastically deforms teeth and presses the sprocket in the driven direction.
[Explanation of symbols]
10 Film unit with lens
13 Shooting lens
14 Shutter button
15 Winding knob
24 Patrone
26 Photo film
39 large perforations
40 small perforations
41, 72, 80 sprocket
43 Shutter drive lever
44 Locking lever
45 leaf spring
50a protrusion
70 Pressing lever
80a Elastic teeth

Claims (9)

At least one tooth meshing with a perforation of a specific size formed at least one per photo frame on the photographic film is projected on the circumference and attached after the teeth are removed from the perforation as the film is transferred. It has a sprocket that is energized and rotated to a standby position just before meshing with the next perforation by the energizing means and allows film transfer while slipping on the tooth surface until the next perforation arrives. The film performs shutter charging by utilizing the rotational force of the sprocket during one frame transfer of the photographic film, and prevents the sprocket from rotating when the film is transferred for one frame. In the hoisting device,
The biasing means biases the sprocket in a driven direction along the film transfer direction until the sprocket teeth come out of the perforation and mesh with the next perforation using the shutter charge force. Film winding device. The sprocket has a shape in which the teeth protrude from each other at positions 180 ° apart from each other on the circumferential surface, and is rotated halfway in the driven direction along the transfer direction while the film is transferred for one frame. During this time, after the preceding tooth is removed from the perforation, it is urged and rotated in the driven direction by the urging means, and the following tooth is brought into contact with the photographic film and the urging rotation is prohibited. And then allowing the transfer of the photographic film while slipping on the tooth surface until this subsequent tooth engages with the next perforation,
Transport means for transporting the photographic film in the film winding direction after completion of photographing;
A shutter drive lever that is moved to the charge position against the spring bias using this rotation while the sprocket is half-rotated;
When the sprocket is rotated halfway, the shutter drive lever is moved to the anti-rotation position that holds the charge lever in the charging position to prevent the transfer means from being transferred, and is moved to the anti-winding release position in conjunction with the shutter release. 2. The film winding apparatus according to claim 1, further comprising a locking lever for releasing the blocking of the transfer means after releasing the holding of the shutter drive lever at the charging position. While using the photographic film wound up one frame at a time so that the center between the perforations with long intervals among the perforations arranged alternately at two intervals is aligned with the longitudinal center of the exposure position,
In the sprocket, when a pair of perforations arranged at short intervals move, two pairs of teeth that sequentially mesh with each other protrude at positions 180 ° apart on the circumferential surface. When the film transfer is completed, the pair of teeth mesh with the perforation, and during the film transfer for one frame, it rotates halfway in the driven direction along the transfer direction. After the pair of teeth disengaged from the pair of perforations, the biasing means biases and rotates the sprocket in the driven direction, and the subsequent pair of teeth abuts the photographic film and the sprocket rotates. After being prohibited, the photographic film is transferred while slipping on the tooth surface until the subsequent pair of teeth engages with the next pair of perforations. Acceptable,
In addition, the biasing means may be a period from when the pair of preceding teeth out of the two pairs of teeth of the sprocket are disengaged from the pair of perforations until the pair of subsequent teeth engage with the next pair of perforations. While urging the sprocket in the driven direction,
Transport means for transporting the photographic film in the film winding direction after completion of photographing;
A shutter drive lever that is moved to a charge position against spring bias using rotation of the sprocket while the pair of teeth are engaged with a pair of perforations during the half rotation of the sprocket; ,
When the sprocket rotates halfway, the shutter drive lever moves to a winding stop position that holds the charging position to block the transfer means, and moves to a winding release release position in conjunction with a shutter release. And a locking lever for releasing the blocking of the transfer means after releasing the holding of the shutter drive lever at the charging position. The film winding apparatus according to claim 1. The urging means includes a protrusion projecting on a circumferential surface that rotates integrally with the sprocket, and a shutter drive lever that is urged by the shutter charging spring, so that the protrusion is moved in the driven direction of the sprocket. 4. The film winding device according to claim 1 , wherein the film winding device comprises a pressing lever for pressing . At least one tooth meshing with a perforation of a specific size formed at least one per photo frame on the photographic film is projected on the circumference and attached after the teeth are removed from the perforation as the film is transferred. It has a sprocket that is energized and rotated to a standby position just before meshing with the next perforation by the energizing means and allows film transfer while slipping on the tooth surface until the next perforation arrives. The film performs shutter charging by utilizing the rotational force of the sprocket during one frame transfer of the photographic film, and prevents the sprocket from rotating when the film is transferred for one frame. In the hoisting device,
The biasing means is composed of teeth that are elastically provided by cutting out a part of the sprocket, and a pressing portion that elastically deforms the teeth and presses the sprocket in the driven direction. Film winding device. The sprocket has a shape in which the teeth protrude from each other at positions 180 ° apart from each other on the circumferential surface, and is rotated halfway in the driven direction along the transfer direction while the film is transferred for one frame. During this time, after the preceding tooth is removed from the perforation, it is urged and rotated in the driven direction by the urging means, and the following tooth is brought into contact with the photographic film and the urging rotation is prohibited. And then allowing the transfer of the photographic film while slipping on the tooth surface until this subsequent tooth engages with the next perforation,
Transport means for transporting the photographic film in the film winding direction after completion of photographing;
A shutter drive lever that is moved to the charge position against the spring bias using this rotation while the sprocket is half-rotated;
When the sprocket is rotated halfway, the shutter drive lever is moved to the anti-rotation position that holds the charge lever in the charging position to prevent the transfer means from being transferred, and is moved to the anti-winding release position in conjunction with the shutter release. 6. The film winding apparatus according to claim 5, further comprising a locking lever that releases the blocking of the transfer means after releasing the holding of the shutter drive lever at the charging position. While using the photographic film wound up one frame at a time so that the center between the perforations with long intervals among the perforations arranged alternately at two intervals is aligned with the longitudinal center of the exposure position,
In the sprocket, when a pair of perforations arranged at short intervals move, two pairs of teeth that sequentially mesh with each other protrude at positions 180 ° apart on the circumferential surface. When the film transfer is completed, the pair of teeth mesh with the perforation, and during the film transfer for one frame, it rotates halfway in the driven direction along the transfer direction. After the pair of teeth disengaged from the pair of perforations, the biasing means biases and rotates the sprocket in the driven direction, and the subsequent pair of teeth abuts the photographic film and the sprocket rotates. After being prohibited, the photographic film is transferred while slipping on the tooth surface until the subsequent pair of teeth engages with the next pair of perforations. Acceptable,
In addition, the biasing means may be a period from when the pair of preceding teeth out of the two pairs of teeth of the sprocket are disengaged from the pair of perforations until the pair of subsequent teeth engage with the next pair of perforations. While urging the sprocket in the driven direction,
Transport means for transporting the photographic film in the film winding direction after completion of photographing;
A shutter drive lever that is moved to a charge position against spring bias using rotation of the sprocket while the pair of teeth are engaged with a pair of perforations during the half rotation of the sprocket; ,
When the sprocket rotates halfway, the shutter drive lever moves to a winding stop position that holds the charging position to block the transfer means, and moves to a winding release release position in conjunction with a shutter release. 6. The film winding apparatus according to claim 5, further comprising a locking lever that releases the blocking of the transfer means after releasing the holding of the shutter drive lever at the charging position. Two perforations arranged alternately at two intervals are rolled up one frame at a time so that the center between the long intervals of the perforations is aligned with the longitudinal center of the exposure position, and two adjacent perforations are sized. Transporting means for transporting a photographic film formed by two different large and small perforations in the film winding direction after the completion of photographing;
When a pair of perforations arranged at short intervals move, two pairs of teeth sequentially meshing with each other protrude at positions 180 ° apart on the circumferential surface, and the pair of teeth, It consists of small teeth that engage with small perforations and large teeth that engage with large perforations, and when the transfer of one frame of film is completed, the pair of teeth meshes with the perforation and transfers one film of film. A sprocket that rotates halfway in the driven direction along its transfer direction during
The sprocket is urged in the driven direction from the time when the preceding pair of teeth of the two pairs of teeth of the sprocket is disengaged from the pair of perforations until the succeeding pair of teeth engages with the next pair of perforations. Energizing means to perform,
A shutter drive lever that is moved to a charge position against spring bias using rotation of the sprocket while the pair of teeth are engaged with a pair of perforations during the half rotation of the sprocket; ,
When the sprocket rotates halfway, the shutter drive lever moves to a winding stop position that holds the charging position to block the transfer means, and moves to a winding release release position in conjunction with a shutter release. A release lever for releasing the blocking of the transfer means after releasing the holding of the shutter drive lever at the charge position;
While the photographic film is transported by one frame, after the preceding pair of teeth are disengaged from the pair of perforations, the urging means urges the sprocket to rotate in the driven direction so that the succeeding pair of teeth After the urging rotation of the sprocket is prohibited by coming into contact with the photographic film, the photographic film is transferred while slipping on the tooth surface of the teeth until the subsequent pair of teeth is engaged with the next pair of perforations. Film winding device characterized by allowing 9. The film hoisting device according to claim 8 , wherein the sprocket is elastically formed so that large teeth engaging with large perforations are recessed inward.

Images