JP3585974B2 - Shutter charge mechanism - Google Patents

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film provided with one or two charging perforations for each frame, and relates to a mechanism for performing shutter charging during one frame advance.
[0002]
[Prior art]
For example, Japanese Patent Application Laid-Open No. 3-179442 discloses a photographic film provided with one or two perforations per frame so that magnetic recording can be efficiently performed outside the photographic screen range. In a camera using such a film, it is convenient to perform one frame advance of the film by a motor while monitoring the passage of the perforation by a photo sensor, and to charge the shutter by driving the motor. However, inexpensive cameras and film units with lenses, which are pre-packaged and sold as known by "Sharp Run Hi" (product name), require a photo sensor or motor to reduce cost. Therefore, it is necessary to mechanically detect the movement of the perforation and perform one frame advance or shutter charge.
[0003]
2. Description of the Related Art As a camera using a film of one frame and one perforation, a camera using a so-called 110 film cartridge is known. JP-A-63-51329 discloses a film unit with a lens incorporating a 110 film cartridge. The shutter charging mechanism used in these devices has a locking claw that is spring-biased substantially vertically toward the film. The film is fed by the winding operation, and when the perforations move, the locking claws protrude and enter the perforations. Then, by continuously feeding the film, the locking claw is moved substantially linearly along the film transfer path, and during this time, the shutter is charged. When the locking claw reaches a predetermined position, it comes into contact with the regulating pin and stops. At this time, since the locking claw remains engaged with the perforation, the film is prevented from being wound up and the film is prevented from moving. When the shutter button is pressed, the pawl is pulled out of the perforation in a substantially vertical direction, and at the next moment the shutter blades are driven to expose the film. When the pressing of the shutter button is stopped, the locking claw is returned by the spring and pressed against the film surface in preparation for the next film winding.
[0004]
[Problems to be solved by the invention]
However, in the case of the shutter charging mechanism, as described above, the movement of the locking claw is substantially perpendicular to the film path when pressed against the film surface, and substantially along the film path when the shutter is charged. All are substantially linear, such as linearly, when pulled out of the perforation by the shutter release, and substantially vertically from the film path. In particular, when the shutter is charged, the locking claw moves linearly along the film path while engaging with the perforation. It is difficult to apply to a film having a curved film surface. That is, the locking claw that moves linearly cannot follow the curved film path, and falls out of the perforation during or after shutter charging. If the locking claw is disengaged from the perforation even after the shutter is charged, the film can swing, so that the film is blurred at the time of photographing, causing double images and deteriorating focus. Furthermore, since many sliding members are used, the number of parts is large, the moving mechanism of the locking claw is complicated, and it is difficult to perform automatic assembly, so that there is a problem that cost increase cannot be avoided.
[0005]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has a simple structure and low cost, while sending one or two films per frame provided with one or two charging perforations. It is an object of the present invention to provide a shutter charging mechanism which can surely charge the shutter and prevent the film from swinging.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a shutter charging mechanism according to claim 1 is a shutter charging mechanism used for a film in which one or two perforations for shutter charging are formed per frame. The shutter blades are opened and closed while moving from the shutter release position to the release completion position, and are engaged with the winding drive member at the charging position and have a locking claw for preventing the operation thereof, and are engaged with the perforation at the time of film winding. A detection claw that follows the movement of the film in the winding direction and engages with the shutter driving member during movement against the urging of the return spring so that the shutter driving member resists the urging of the spring. Charging member to move from the release completion position to the charging position, and And a locking portion that holds the shutter driving member at the charging position by locking the charging member that has been moved by a predetermined amount in the film winding direction from the initial position, and charges the shutter driving member by the shutter release operation. By releasing the engagement from the member, the shutter driving member is moved from the charging position to the release completion position by the bias of the spring to open and close the shutter blades, and the locking pawl is disengaged from the winding driving member to operate the winding driving member. In conjunction with the start, the locking of the charging member by the locking portion is released, and the charging member is returned to the initial position by the bias of the return spring.
[0007]
According to a second aspect of the present invention, in the shutter charging mechanism according to the first aspect, the shutter driving member and the charging member are urged in a direction in which they are in close contact with each other by the urging of the spring and the return spring. At the same time, while the shutter driving member is engaged with the charging member and is moved from the release completion position to the charging position, the shutter driving member and the charging member are integrated so that the detection claw is engaged with the perforation. It is biased toward the film side.
[0008]
[Action]
When the film is fed by operating the winding drive member from the release completed state, the detection claw slips on the film surface until the perforation for charging is moved. When the perforation for charging reaches the position of the detection claw, the perforation is engaged with the detection claw. Thereafter, the charging member engages with the shutter driving member following the film feed, and moves the shutter driving member toward the charging position. When the shutter driving member reaches the charging position, the charging member is locked by the locking portion, and the shutter driving member is held at the charging position. At the same time, the locking pawl of the shutter driving member engages with the winding driving member to prevent its operation.
[0009]
When the shutter button is released, the shutter driving member is disengaged from the charging member, and is moved from the charging position to the release completion position by the bias of the spring. The movement of the shutter driving member opens and closes the shutter blades, and releases the locking pawl from the winding driving member. When the shutter blade is opened and closed, the charging member is locked by the locking portion while the detection claw of the charging member is engaged with the film, so that the film is prevented from swinging, and the film is blurred and a double image is generated. Accidents, such as falling and defocusing, are eliminated. When the operation of the winding drive member is started after the shutter drive member reaches the release completion position, the locking of the charging member by the locking portion is released, and the charging member is returned to the initial position by the bias of the return spring. .
[0010]
【Example】
Hereinafter, an embodiment in which the shutter charging mechanism of the present invention is applied to a film unit with a lens will be described. FIG. 2 is an exploded view of the unit main body of the film unit with a lens, and the unit main body 10 includes a main body 11, a front cover 12, and a rear cover 13. In the main body 11, a dark box 11a is formed at the center thereof, and a patrone chamber 11b and a film roll chamber 11c are formed on both sides of the dark box 11a. The patrone chamber 11b has a patrone 16 and the film roll chamber 11c has a patrone 16 from the patrone 16. A film roll 18 is drawn out of the film 17 and rolled.
[0011]
The film 17 has two charging perforations 17a and 17b per frame along one side edge thereof. The perforations 17a and 17b are different in size from each other, and the perforations 17a are smaller than the perforations 17b. Note that a paper box provided with an opening in a necessary portion required for a shooting operation is used as an exterior body of the unit main body 10, but is not shown.
[0012]
A winding dial 20 is attached to the upper part of the patrone chamber 11b. A knurl 20a is engraved on the outer peripheral surface of the winding dial 20, and a fork is integrally provided on the bottom surface. This fork penetrates the upper wall of the patrone chamber 11b and is engaged with the spool 16a of the patrone 16. When the winding dial 20 is rotated counterclockwise (in the direction of the arrow) every time one frame is shot, the film that has been shot is wound into the cartridge 16.
[0013]
A shutter charging mechanism 21 of the present invention, which will be described later, is attached to the upper part of the dark box part 11a. A shutter blade 22 and a return spring 23 are attached to the front part. A shutter cover 26 is attached so as to cover the front surface. A lens mount portion is formed on the shutter cover 26, and the taking lens 27 is fitted therein. Further, a light-shielding cover 25 that covers the shutter charge mechanism 21 in a light-tight manner is attached.
[0014]
A front cover 12 is hooked on a front surface of the main body 11 to which each component is attached. A photographing window 12a and a finder objective window 12b are formed at a front portion of the front cover 12, and a shutter button 28 is integrally formed at an upper portion. When the shutter button 28 is depressed, a wedge-shaped release arm 28 a integrally provided below the shutter button 28 acts on a projection 30 formed on the shutter driving member 29 of the shutter charging mechanism 21, and the kicking portion 31 of the shutter driving member 29 is kicked off. As a result, the end 22a of the shutter blade 22 is kicked off, the shutter blade 22 is opened, and the return spring 23 is urged to return to the closed position to perform one exposure.
[0015]
The rear cover 13 is hooked to the back surface of the main body 11 and covers the inside of the main body 11 light-tight. A curved film support surface 13a is formed on the inner surface of the rear cover 13, and supports the film 17 in a curved state with an aperture formed on the back surface of the dark box 11a. Thus, even when a single lens is used as the photographing lens 27, it is possible to suppress the influence of field curvature and obtain a clear image.
[0016]
In FIG. 1 showing an initial state immediately after the exposure of the shutter charge mechanism 21 is completed and before the shutter charge is started, an upper portion of the main body 11 is a shutter base 34 of the shutter charge mechanism 21. A groove 34a is formed in the shutter base 34. Inside the shutter base 34, the shutter driving member 29 and a charging member 35 for moving the shutter driving member 29 from a release completion position to a charging position are slidable substantially in parallel. It is stored in. On the bottom surface of the groove 34a, the fulcrum protrusions 36 and 37, which are provided upright on the shutter base member 34 side surface of the shutter driving member 29 and the charging member 35, are rotatable and movable in the film feeding direction. The receiving long grooves 38 and 39 are formed.
[0017]
In addition to the receiving portion 30 and the kicking portion 31, the charging driving claw portion 29a and the locking claw portion 41 are integrally formed on the shutter driving member 29. The charging engaging claw 29a is formed on an edge of the charging member 35 on the shutter driving member 29 side, and is formed on an edge of the charging member 35 on the shutter driving member 29 side. And when the shutter is charged. The winding claw 41 is formed integrally with the receiving part 30 and is provided at the same height as the hoisting dial 20 by the support part 42. Then, the winding pawl 41 engages with the knurl 20a of the winding dial 20 at the charging position, and prevents the winding operation of the winding dial 20. A coil spring 43 is stretched between the shutter driving member 29 and the shutter base 34 via projections 29b and 34b, and the shutter driving member 29 is urged clockwise around the fulcrum projection 36. .
[0018]
In addition to the charging engagement claw 35a, the charging member 35 is formed with two claw portions 44 and 45 having different thicknesses, which detect the perforations 17a and 17b of the film 17 and engage with the perforations 17a and 17b, respectively. Have been. The outer edges of the tips of the claws 44, 45 are tapered inwardly, and the thickness of the claws 44, 45 corresponds to the size of the perforations 17a, 17b. Since the thickness of the claw portion 44 <the thickness of the claw portion 45, the perforations 17a pass through the claw portion 45 without engaging with the claw portion 44 when the film 17 is fed. , And at the same time, the perforations 17b are engaged with the claw portions 45.
[0019]
On the surface of the charging member 35 on the side of the shutter base 34, a locking projection 47 is formed in addition to the fulcrum projection 37, and the locking projection 47 is received on the bottom surface of the groove 34a to place the charging member 35 in the charging position. A cam groove 50 with a triangular cam 49 that locks with is formed. A coil spring 51 is stretched between the charging member 35 and the shutter base 34 via projections 35b and 34c, and the charging member 35 is biased counterclockwise about the fulcrum projection 37. The urging force of the coil spring 51 is set smaller than the urging force of the coil spring 43, and the shutter driving member 29 and the charging member 35 are urged clockwise as a whole.
[0020]
A projection 55 is provided upright on the upper portion of the charging member 35 adjacent to the projection 30 of the shutter driving member 29. At the time of shutter release, the wedge-shaped tip portion 28b (see FIG. 4A) of the release arm 28a is inserted into the gap between the projections 30 and 55, so that the charging member 35 is pressed against the film side and the shutter driving member 29 is pressed. Since the rotation is rotated counterclockwise about the fulcrum 36, the engagement of the charging engagement claws 29a and 35a is released. It should be noted that a ridge 34d that regulates the release completion position of the shutter driving member 29 is formed on a part of the wall that forms the groove 34a.
[0021]
The operation of the thus configured shutter charging mechanism 21 will be described with reference to FIGS. In the initial state shown in FIG. 3A, the shutter driving member 29 and the charging member 35 are urged by the coil springs 43 and 51 in a direction in which they are in close contact with each other. It is engaged and integrated. Since the urging force of the coil spring 43 is larger than the urging force of the coil spring 51, the shutter driving member 29 and the charging member 35 are generally urged clockwise and toward the film roll chamber 11c. As a result, the fulcrum projections 36 and 37 are in contact with the ends of the long grooves 38 and 39 on the film roll chamber 11c side, and the charging member 35 is in contact with the protruding ridge 34d, and the claws 44 and 45 are in contact with the film surface. Is in sliding contact.
[0022]
When the winding dial 20 is operated from the initial state shown in (A) to rotate the spool 16a in a counterclockwise direction and the film 17 is wound into the cartridge 16, the film 17 is transported toward the winding dial 20 side. Is done. When the perforations 17a, 17b of the film 17 reach the positions of the claws 44, 45, the claws 44, 45 are engaged with the perforations 17a, 17b. At this time, first, the perforations 17a reach the claw portions 45. However, since the tip portions of the claw portions 45 are formed in a tapered shape along the film transport direction and the claw portions 45 are thicker than the size of the perforations 17a, the perforations 17a are It passes without engaging with the claw portion 45. When the perforation 17a reaches the claw portion 44, the tip of the claw portion 44 is formed in a tapered shape so as to be opposite to the film transport direction, and the size of the perforation 17a corresponds to the thickness of the claw portion 44. Therefore, the perforations 17a engage with the claw portions 44. At the same time, the perforations 17b reach the positions of the claw portions 45 and engage with the claw portions 45.
[0023]
Thereafter, as the film 17 is transported, the shutter driving member 29 and the charging member 35 start moving integrally toward the winding dial 20. When the edge of the charging member 35 leaves the ridge 34 d, the shutter driving member 29 and the charging member 35 are rotated clockwise about the fulcrum projections 36 and 37. Since the shutter driving member 29 and the charging member 35 are in contact with the triangular cam 49, the shutter driving member 29 and the charging member 35 are moved toward the hoisting dial 20 along the surface of the triangular cam 49.
[0024]
As shown in FIG. 7B, when the transfer of the film 17 proceeds and the locking projection 47 comes into contact with the tapered surface 49b of the triangular cam 49, the shutter driving member 29 and the charging member 35 become fulcrum projections 36 and 37. Is rotated counterclockwise around the center. Since the angle of the tapered surface 59b of the triangular cam 49 substantially corresponds to the curvature of the curved surface of the film support surface 13a, there is no possibility that the claws 44, 45 will come off the perforations 17a, 17b.
[0025]
When the transfer of the film 17 further proceeds and the shutter driving member 29 reaches the charging position as shown in FIG. 7C, the locking projection 47 is disengaged from the apex of the tapered surface 49b of the triangular cam 49, and the coil springs 43 and 51 The shutter driving member 29 and the charging member 35 are rotated clockwise around the fulcrum projections 36 and 37 by the combined urging force, and the locking projection 47 abuts on the vertical surface 49c of the triangular cam 49 to lock the charging member 35. You. At the same time, the winding claw 41 is engaged with the knurl 20 a of the winding dial 20, and prevents the winding operation of the winding dial 20. In this charged state, the kicking portion 31 is located on the right side of the end 22 a of the shutter blade 22 in the drawing.
[0026]
Thereafter, when the shutter button 28 is pressed, the wedge-shaped tip portion 28b of the release arm 28a is inserted into the gap between the projections 30 and 55, as shown in FIG. As a result, the shutter driving member 29 is rotated counterclockwise about the fulcrum 36 while the charge member 35 is pressed against the film, so that the engagement between the locking pawl 41 and the knurl 20a is released. At the same time, the engagement of the charging engagement claws 29a, 35a is released.
[0027]
The shutter driving member 29 is separated from the charging member 35 and starts running at high speed toward the release completion position by the urging force of the coil spring 43. At the next moment, the kicking section 31 kicks off the end 22a of the shutter blade 22, the exposure hole formed behind the shutter blade 22 is opened and closed, and the film 17 set in the aperture is exposed. At this time, since the claw portions 44 and 45 of the charging member 35 remain engaged with the perforations 17a and 17b, the swing of the film 17 is prevented, and a sharp focused image can be obtained. Then, the shutter driving member 29 is returned to the release completion position shown in FIG.
[0028]
Immediately after the end of the exposure, the charging member 35 remains stopped at the charging position. However, when the winding dial 20 is operated in preparation for the next photographing, the charging member 35 is pulled by the film 17 to be transferred as shown in FIG. As a result, the charging member 35 is rotated counterclockwise, the claws 44 and 45 are pulled out of the perforations 17a and 17b, and the locking projection 47 is disengaged from the vertical surface 49c of the triangular cam 49. As a result, the charging member 35 is returned to the initial position shown in FIG. 3A by the urging force of the coil spring 51. Although not shown, a claw formed on the upper portion of the charging member 35 is used to display a number-of-images display plate for displaying the number of images that can be taken, which is disposed above the charging member 35 during the rotation of the charging member 35. Step by the scale.
[0029]
When the charge member 35 is rotated counterclockwise by the transfer of the film 17, the shutter drive member 29 is rotated by the edge of the charge member 35 and rotated in the counterclockwise direction. The rotation of the charging member 35 in the counterclockwise direction is not hindered. When the charging member 35 returns to the initial position, the shutter driving member 29 and the charging member 35 are both rotated clockwise by the combined biasing force of the coil springs 43 and 51, and the state shown in FIG.
[0030]
In the embodiment described above, the shutter charging mechanism of the present invention is applied to a film unit with a lens. However, the embodiment can also be applied to a forward-wound camera. In this case, for example, a film take-up chamber having a take-up shaft may be provided instead of the patrone chamber, and a patrone chamber may be provided instead of the film roll chamber. Although only an embodiment using two films per frame for charging is described, one film per frame may be used. In the film of the above embodiment, only the perforation for charging is shown. In addition to this, for example, a perforation that engages with a winding shaft at the leading end of the film, and the end of the film at the end of the film are on the camera side. Perforations and the like for transmission are formed.
[0031]
【The invention's effect】
As described in detail above, according to the shutter charging mechanism of the present invention, the shutter driving member is moved to the charging position and held by the charging member that is moved in conjunction with film winding, so that a simple structure is provided. Although the cost is low, the shutter charge can be surely performed while the film provided with one or two charging perforations per frame is fed one frame. In addition, since the shutter driving member is disengaged from the charging member by the shutter release operation and is moved toward the release completion position, the detection claw of the charging member holds the film while the shutter driving member opens and closes the shutter blade. Since the film remains engaged, accidents such as blurring of the film to cause a double image and deterioration of focus can be solved. Further, when the shutter driving member and the charging member are urged in the direction in which they are brought into close contact with each other and the shutter driving member is moved to the charging position, the shutter driving member and the charging member are urged toward the film as a whole. Therefore, it is possible to reliably perform shutter charging without disengaging both the engagement between the shutter driving member and the charging member and the engagement between the detection claw and the perforation when the film is wound up with a simple configuration. The shutter release member can be easily disengaged from the charge member by the shutter release operation.
[Brief description of the drawings]
FIG. 1 is an explanatory view schematically showing a configuration of a shutter charging mechanism of the present invention.
FIG. 2 is an exploded perspective view showing a configuration of a unit main body of a film unit with a lens to which a shutter charging mechanism of the present invention is applied.
FIG. 3 is an explanatory diagram showing an operation of the shutter charging mechanism from an initial state to a charging state.
FIG. 4 is an explanatory diagram showing an operation from a shutter release state of a shutter charging mechanism to a shutter release and performing a winding operation in preparation for the next photographing.
[Explanation of symbols]
REFERENCE SIGNS LIST 10 unit main body 11 main body 11b patrone chamber 11c film roll chamber 16 patrone 17 film 17a, 17b perforation 20 winding dial 20a knurl 21 shutter charging mechanism 22 shutter blade 28 shutter button 29 shutter driving member 29a, 35a charging engaging claw 30 , 55 Projection 31 Kicking part 34 Shutter base 35 Charging member 36, 37 Support point projection 38, 39 Long groove 41 Locking claw 43, 51 Coil spring 44, 45 Claw 47 Locking projection 49 Triangular cam 50 Cam groove

Claims (2)

In a shutter charging mechanism used for a film in which one or two shutter charging perforations are formed per frame,
A shutter driving member having a locking pawl for opening and closing the shutter blade while moving from the charging position to the release completion position by the bias of the spring, and engaging with the winding driving member at the charging position to prevent the operation thereof; Sometimes, it has a detection claw that engages with the perforation, follows the movement of the film in the winding direction, and engages with the shutter drive member while moving against the bias of the return spring to move the shutter drive member. A charging member that moves from the release completion position to the charging position against the bias of the spring, and a charging member that is provided in a moving area of the charging member and that has moved by a fixed amount in the film winding direction from the initial position is locked at that position. And a locking portion for holding the shutter driving member at the charging position. By disengaging the shutter driving member from the charging member, the shutter driving member is moved from the charging position to the release completed position by the bias of the spring to open and close the shutter blades, and disengages the locking pawl from the winding driving member. A shutter charging mechanism wherein the locking of the charging member by the locking portion is released in conjunction with the start of the operation of the winding drive member, and the charging member is returned to the initial position by the bias of the return spring. The shutter driving member and the charging member are urged in a direction in which they are in close contact with each other by the urging of the spring and the return spring. 2. The shutter according to claim 1, wherein the shutter driving member and the charging member are integrally biased toward the film so that the detection claw is engaged with the perforation during the movement. Charge mechanism.

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