JPH03294848A - Photographic film cartridge - Google Patents

Abstract

PURPOSE:To smoothly and further surely send the leading end of a film out of a cartridge main body by forming an inclined surface guiding the insertion of a spool driving shaft and an engaging part receiving the torque from the spool driving shaft, on the end part of a spool. CONSTITUTION:The inclined surface guiding the insertion of the spool driving shaft 10 freely rotatively provided on the cartridge room of a camera and the fitting part receiving the torque from the spool driving shaft are formed on the end part of the spool 6 of this photographic film cartridge 2. When the photographic film cartridge 2 is loaded on the camera, the inclined surface is slid on the spool driving shaft 10, and guided so that the shaft centers of the spool 6 and the spool driving shaft 10 are coincident with each other. Thus, when the film 5 is sent, the outer periphery of the film 5 can be smoothly slid on a rib, and the film 5 is surely sent outside the cartridge main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photographic film cartridge containing film.

[Conventional technology]

In a camera using 135 film, an unexposed film is pulled out from a photographic film cartridge every time a photograph is taken, and this is set in an exposure frame, and the exposed film is wound into a film winding chamber. When winding is no longer possible, a fork is installed in the cartridge chamber of the camera, and the photographic film cartridge consists of a cartridge body, a rotatable spool inside the cartridge body, and a film with one end fixed to the spool. Consisting of When this photographic film cartridge is loaded into the cartridge chamber of the camera, unexposed film is pulled out each time a photo is taken.
The exposed film is wound into a film winding chamber.

When all the films have been pulled out, the films are rewound into the cartridge main body by a spool rotated by a fork provided in the cartridge chamber. For this reason,
The end face of the spool is formed with a recess into which a fork provided in the cartridge chamber of the camera is fitted, and when the fork rotates, a pair of recesses are formed on the inner peripheral surface of the recess that come into contact with the fork and rotate the spool. protrusions are formed.

Recently, as disclosed in U.S. Pat. No. 4,846,418, in order to simplify the loading operation into the camera, the tip of the film is stored inside the cartridge body.
A photographic film cartridge has been proposed in which the leading edge of the film can be fed out of the cartridge body by rotating a spool. A ring-shaped rib is formed inside the cartridge body, and this rib presses the outer peripheral surface of the film wound around the spool to prevent it from unwinding.

[Problem to be solved by the invention]

However, in the photographic film cartridge mentioned above,
Since the outer circumferential surface of the film is pressed against the ribs, if the spool axis and the axis of the spool drive shaft on the camera side are rotated while being misaligned, a portion of the outer circumferential surface of the film will be strongly rubbed by the ribs. As a result, the sliding friction increases and the problem arises that the film cannot be fed out.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a photographic film cartridge in which the leading edge of the film can be smoothly and reliably fed out from within the cartridge main body.

[Means to solve the problem]

In order to achieve the above object, the present invention has an inclined surface provided at the end of the spool of a photographic film cartridge for guiding the insertion of a spool drive shaft which is rotatably provided in the cartridge chamber of a camera, and an inclined surface for guiding the insertion of a spool drive shaft rotatably provided in the cartridge chamber of a camera. A meshing portion that receives rotational force is formed. Further, in another invention, at least three meshing portions are provided at the end of the spool, and these are arranged rotationally symmetrically with respect to the rotation axis of the spool.

[Operation] According to the above configuration, when a photographic film cartridge is loaded into the camera, the inclined surface slides into contact with the spool drive shaft, and the spool is guided so that the axial center of the spool is aligned with the axial center of the spool drive shaft. . Further, in another invention, the rotational force of the spool drive shaft is transmitted to the spool after being evenly distributed by at least three meshing parts.

〔Example〕

In FIG. 1 showing a first embodiment of the film cartridge of the present invention, a cartridge main body 2 consists of an upper case 3 and a lower case 4, each made of light-shielding plastic, with a film 5 wound inside. A spool 6 is rotatably housed therein. Since the spool 6 is formed short so that both ends do not protrude outside the outline of the cartridge main body 2, the spool 6 cannot be easily rotated by a user's fingers or the like.

A recess 8 having five tapered surfaces 9 is formed on the front end surface of the spool 6, and the recess 8 has the shape of a non-return pentagonal truncated pyramid that narrows as it becomes deeper. This recess 8 is a retaining portion 11 in the shape of a pentagonal truncated pyramid shown in FIG.
is fitted. This engaging portion 11 is formed at one end of the spool drive shaft 10. In this embodiment, the shape of the recess 8 is a non-returning five-sided truncated pyramid, but the shape of the recess 8a may be a non-returning triangular truncated pyramid, as shown in FIG. In this case, the shape of the engaging portion 11a needs to be a truncated triangular pyramid as shown in FIG. Moreover, the shape may be a non-returning polygonal truncated pyramid including a non-returning four-sided truncated pyramid.

As shown in FIG. 6, the spool drive shaft 10 has a bearing formed on an inner wall 15 of the cartridge chamber and is slidably inserted into a hole 16. Further, the other end of the spool drive shaft 10 is fitted into a boss hole 18 formed in the camera body 17. A spring 19 is inserted into the boss hole 18, and this spring 19 urges the spool drive shaft 10 upward.

A gear 20 is formed on the spool drive shaft 10 and meshes with a transmission gear 21 driven by a camera drive mechanism. Further, the spool drive shaft 1o has a side surface of the gear 20 on the inner wall 1.
5, so it will not fly out into the cartridge chamber. Since the transmission gear 21 is formed with a thick tooth width, even if the spool drive shaft 10 slides up and down, it will not come out of mesh with the gear 20, and the driving force of the drive mechanism will be transferred to the spool drive shaft 10. Reliably communicated.

The rotational force of the spool drive shaft 10 is transmitted to the spool 6 via the five tapered surfaces 9 that the respective side surfaces of the engaging portion 11 abut. Therefore, a force of 115 of the rotational force of the spool drive shaft 10 is applied to each tapered surface 9.

FIG. 2 shows the inside of the cartridge main body. A pair of ring-shaped ribs 25 are provided on the inner peripheral surface of the cartridge main body 2, and the ribs 25 abut against the outer peripheral surface of the film 5. Prevents unraveling. Therefore, when the spool 6 is rotated counterclockwise (hereinafter referred to as the feeding direction), the leading end of the film 5 is rotated in the feeding direction. The tip of the film 5 is attached to a separating claw 2 formed on the rib 25.
6, the film 5 is peeled off from the outer circumferential surface of the film 5, and is sent out of the cartridge main body 2 through the film outlet 28. A well-known telemp 29 is attached to the film drawer opening 28, and this telemp 29
Block out external light from 8. Further, a pair of flanges 30 are formed on the spool 6, and the flanges 30
aligns the end faces of the film 5 and blocks external light from the longitudinal direction of the cartridge main body 2.

In FIG. 7 showing a camera using the film cartridge, an exposure frame 36 is provided at the center of the camera body 17 with the back cover 35 open. A pressure plate 37 and a film guide 38 are provided on the back IE 35. When the back cover 35 is closed, this pressure plate 37 presses the film 5 set in the exposure frame 36 to ensure its flatness, and also creates a film passage 3 between it and the exposure frame 36.
form. At the top of this exposure frame 36 is a sprocket 40 that is rotated through the perforations of the film 5.
is attached, and this sprocket 40 detects the amount of feed of the film 5.

A cartridge chamber 41 is formed on the left side of the camera body 17, and a film winding chamber 42 is formed on the right side so as to sandwich the exposure frame 36. The engaging portion 11 is exposed on the back side of the cartridge chamber 41, and the cartridge main body 2 is inserted from the cartridge insertion opening 43 formed on the front side in the direction shown by the arrow in the figure.

A winding shaft 45 is attached to the center of the film winding chamber 42 . This winding shaft 45 is rotated by the above-mentioned camera drive mechanism, and winds up the film 5 that is wound around the film guide 38.

The operation of the film cartridge of the present invention will be explained below.

When the back cover 21 is opened and the cartridge main body 2 is inserted from the cartridge insertion opening 43 with the recess 8 facing the insertion direction, the tapered surface 9 is guided by the side surface of the engaging portion 11. Note that if the sides of the tapered surface 9 and the engaging portion 11 do not engage,
They can be engaged by simply rotating up to 72 degrees.

When the recess 8 is fitted into the engaging part 11, the tapered surface 9 comes into close contact with the side surface of the engaging part 11, and the axis of the spool 6 is aligned with the axis of the spool drive shaft 10. In order to further ensure this effect, it is desirable that the size of the cartridge chamber 41 near the spool drive shaft 10 be slightly larger than the cartridge main body 2.

Furthermore, if a mechanism is provided in the cartridge chamber 41 to support the cartridge main body 2 with a spring or the like, the cartridge main body 2 can be moved when the shaft centers are misaligned. It becomes easier to match the cores.

Thereafter, when i[35 is closed, the camera drive mechanism rotates the transmission gear 21 and the winding shaft 45. transmission gear 2
1, a spool 6 rotates via a spool drive shaft 10. At this time, since the axis of the spool 6 coincides with the center of the rib 25, the outer peripheral surface of the film 5 is not strongly rubbed by one portion of the rib 25. Therefore, the sliding friction between the film 5 and the ribs 25 is kept constant, and the frictional force does not become strong.

When the spool 6 is rotated in the feeding direction, the film 5
The leading end of the film is smoothly sent out of the cartridge main body 2 from the film drawer opening 2, passes through the film passage 39, and is sent to the film winding chamber 42.

When the leading end of the film 5 is wound around the winding shaft 45,
The film 5 is wound up from the cartridge main body 2. By this winding, the first frame is set in the exposure frame 36, and preparations for photographing are made. Thereafter, the film 5 is wound by the winding shaft 45 every time a photograph is taken. When photography is repeated and the film 5 cannot be pulled out from the cartridge main body 2, the camera drive mechanism rotates the transmission gear 21 in the opposite direction to the direction in which the film is fed out. As a result, the spool 6 is rotated in the rewinding direction, and the film 5 is rewound from the film winding chamber 42 into the cartridge main body 2.

FIG. 8 shows the main part of the second embodiment of the present invention,
A concave portion 51 in the shape of a pin is formed on the end surface of the spool 50, and a slope 5 forming the inner peripheral surface of this concave portion 51.
2 is provided with one locking hole 53. A retaining portion 54 shown in FIG. 9 is fitted into this locking hole 53. This engaging portion 54 is formed on the end surface of the spool drive shaft 10 and has a truncated conical shape corresponding to the recessed portion 51. Further, a metallic click plate 56 is attached to the retaining part 54 so as to be biased by a spring 55 and protrude from the slope of the engaging part 54 so as to be able to come in and out as shown in FIG.

This click plate 56 is fitted into the locking hole 53 and ensures that the rotation of the spool drive shaft 10 is transmitted to the spool 50 without causing the rotating engaging portion 54 to slip within the recess 51. When the spool 50 is fitted into the retaining portion 54, the slope 52 and the slope of the retaining portion come into close contact, and the axis of the spool 50 and the axis of the engaging portion 54 are aligned. In addition, in this embodiment, the click plate 56 and the locking hole 53 are engaged with each other.
Although the rotational force of the spool drive shaft 10 is transmitted to the spool 50, the same effect can be obtained by forming grooves on the slopes of the slope 52 and the retaining part 54, and meshing them, for example, like a gear. Can be done.

FIG. 11 shows the main part of a third embodiment of the present invention, in which a cylindrical recess 61 is formed in the end face of the spool 60. A pair of locking plates 63 each having a tapered surface 62 are provided on the inner peripheral surface of this recess 61 . This spool 60 is rotated by a spool drive shaft 10 shown in FIG. A truncated conical engagement portion 64 is formed on the end surface of the spool drive shaft 10. A pair of protrusions 65 that press the locking plate 63 are formed on the slope of the retaining portion 64 . Note that this protrusion 65 can be provided so as to be able to move in and out of the engaging portion 64, and can also be made to protrude by a built-in spring or the like.

FIG. 13 shows the main part of a fourth embodiment of the present invention. A recess 61 similar to that of the third embodiment is formed in the end face of this spool 66, and the four locking plates 63 are provided in this recess 61. This spool 66 is the first
It can be rotated by a spool drive shaft 10 formed with a retaining portion 64 shown in FIG. Furthermore, the four projections 65 are formed on the engaging portion 64 to reduce the rotational force of the spool drive shaft 10 by four.
It can also be transmitted anywhere.

FIG. 14 shows the main part of a fifth embodiment of the present invention, and the end face of this spool 70 is formed with a tapered cross recess 71 as shown. This spool 70 is the 15th
It is rotated by a spool drive shaft 1O shown in the figure. An engaging portion 72 is formed on the end surface of the spool drive shaft 10 and is shaped around the tip of a cross-shaped screwdriver.
2 is provided with four protrusions 73. When the spool 70 having such a configuration is attached to the spool drive shaft 10, the centering of the spool 70 is performed by the cross recess 71. Further, when the spool drive shaft 10 rotates, the engaging portion 72
are engaged at four locations on the protrusion 73, and the entire engaging portion 72 is pressed evenly to rotate the spool 70.

[Effects of the Invention] As described in detail above, in the present invention, the spool has an inclined surface provided at the end of the spool for guiding the insertion of the spool drive shaft which is rotatably provided in the cartridge chamber of the camera, and a spool drive shaft. Since the meshing portion receives rotational force from the spool, the spool can be rotated by aligning the axial center of the spool with the axial center of the spool drive shaft. Therefore, when feeding the film, the outer peripheral surface of the film can be brought into smooth sliding contact with the ribs, and the film can be reliably fed out of the cartridge body by 4 degrees.

Further, by providing at least three engaging parts at the end of the spool and arranging them rotationally symmetrically with respect to the spool axis, a large force can be transmitted without making the material of the spool strong.

Furthermore, the conventional spool with two engaging parts has a maximum of 18
Although the spool was rotated 0 degrees to engage the spool drive shaft, with this spool, the angle of rotation can be reduced, and the engagement can be performed smoothly.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the film cartridge of the present invention. FIG. 2 is a partially cutaway front view of the film cartridge of the first embodiment. FIG. 3 is a perspective view showing a part of the spool drive shaft that rotates the spool of the first embodiment. FIG. 4 is a perspective view of a main part that is a modification of the first embodiment. 5 is a perspective view showing a part of the spool drive shaft that rotates the spool shown in FIG. 4. FIG. FIG. 6 is a sectional view of essential parts of the film cartridge shown in FIG. 1 and the spool drive shaft drive device shown in FIG. 3. FIG. 7 is a perspective view of a camera using the film cartridge of the first embodiment. FIG. 8 is a perspective view of essential parts of a second embodiment of the present invention. FIG. 9 is a perspective view of a main part of the spool drive shaft that rotates the spool shown in FIG. 8. FIG. 10 is a sectional view of the main parts of the device for driving the spool drive shaft shown in FIG. 9 and the film cartridge of the second embodiment. FIG. 11 is a perspective view of a main part of a third embodiment of the present invention. FIG. 12 is a perspective view of a main part of the spool drive shaft that rotates the spool shown in FIG. 11. FIG. 13 is a perspective view showing a fourth embodiment of the film cartridge of the present invention. FIG. 14 is a perspective view showing a fifth embodiment of the film cartridge of the present invention. FIG. 15 is a perspective view of a main part of the spool drive shaft that rotates the spool shown in FIG. 14. Fig. 1 2...Patrone body 5...Film 6.50, 60.66.70...Spool 8.51.
61... Recessed portion 9.62... Taber surface 10... Spool drive shaft 11.54, 64.72... Engaging portion 17... Camera 28... Film drawer opening 41... Patrone Room 52...Slope 71...Crosshole. Figure 2 (Film) Figure 6 Figure Figure Z ] 6 Day 7 Figure 8 Figure Figure 2 Figure 3

Claims (2)

[Claims] (1) It comprises a spool around which film is wound, and a cartridge main body that rotatably houses this spool and stores up to the leading edge of the film, and a spool drive shaft on the camera side is engaged with the end of the spool; In a photographic film cartridge in which the spool drive shaft is rotated to feed the leading edge of the film out of the cartridge body, the end of the spool receives rotational force from the spool drive shaft and an inclined surface that guides insertion of the spool drive shaft. A photographic film cartridge characterized by forming an interlocking part. (2) The photographic film cartridge according to claim 1, wherein the engaging portions are provided at three or more locations that are rotationally symmetrical with respect to the rotation axis of the spool.