JPH0245856Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a film feeding device for a camera that takes a picture by loading film in a cartridge.

In the conventional method of feeding film using a sprocket, the teeth of the sprocket are attached to one side of the film, and only one or two of the teeth mesh with the perforation.Furthermore, since the film is fed by rotating the sprocket, This method has the disadvantage that shearing force is generated and there is a risk of perforation being cut, making it impossible to feed the film. This has been particularly problematic in automatic film loading devices for cameras.

The present invention is characterized in that the film feeding mechanism of the camera uses an endless belt type caterpillar with claws to feed the film, as an alternative to the sprocket type.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows a driving pulley 1 and a driven pulley 2.
It is a perspective view with an endless belt-type caterpillar with claws (hereinafter simply referred to as a caterpillar) 3 removed. FIG. 2 is a schematic plan view of a state in which the driving pulley 1, driven pulley 2, and caterpillar 3 are combined. The caterpillar 3 is in the shape of an endless belt, and includes a film perflation engaging claw 4 provided at regular intervals with the film perflation row, and a caterpillar drive pulley engaging claw for engaging with the drive pulley 1 and the driven pulley 2. 5 is provided. As can be seen from the figure, the engaging pawl 4 has a circular cross-sectional shape when cut along a line parallel to the belt surface, and each pawl has a conical shape, with only the arc portion of the pawl being perforated. Contact with oration. The driving pulley 1 and the driven pulley 2 are provided with recesses 6 and 7 for engaging with the caterpillar drive pulley engaging pawl 5 of the caterpillar 3. Then, as shown in FIG. 2, the driving pulley 1 and the driven pulley 2
The recesses 6, 7 and the caterpillar drive pulley engagement claw of the caterpillar 3 are engaged, and the caterpillar 3 is driven by applying power to the drive pulley.
The film is fed by meshing the film perforation engaging claw of the caterpillar 3 with the perforation row of the film. Note that the driven pulley 2 is not limited to this embodiment, and may be a driven pulley 2' having a groove 8 shown in FIG. good. The relationship between the sizes of the drive pulley 1 and the driven pulley 2 is that in this embodiment, the drive pulley 1 is larger than the driven pulley 2, but it can be arbitrarily determined as long as the caterpillar can be reliably driven and it can be incorporated into the camera. It is. However, if you do it like this embodiment,
The caterpillar 3 can be driven more reliably. Further, in this embodiment, the caterpillar drive mechanism is achieved by engaging the caterpillar drive engaging pawl of the caterpillar 3 with the recess 6 of the drive pulley 1.
If the caterpillar can be reliably driven, the fourth
It is also possible to use a timing belt or the like as shown in the figure. FIG. 5 is a partial perspective view of a camera to which the present invention is applied, with the back cover open. 11 is the camera body, 12 is the cartridge room, 1
3 is film patrone, 14 is film, 15
is the film perforation, 16 is the exposure frame,
17 is an inner film guide, 18 is an outer film guide, 19 is a back cover, 20 is a film pressure plate, 21
2 is a film feeding device according to the present invention, 22 is a film perforation engaging claw, and 23 is a groove provided in the left film plate 20 for allowing the film perflation engaging claw to escape. As shown in FIG. 5, the film feeding device 21 according to the present invention has a caterpillar in the film feeding direction so as to correspond to the film perforation between the inner film guide 17 and the outer film guide 18. It is installed parallel to the camera in a position that does not interfere with photography.

In the embodiment shown in FIG. 5, film feeding devices are provided on both sides of the film so as to correspond to the film perforation rows on both sides.
It is also possible to provide it only on one side of the film so as to correspond to the perforation rows on either side of the film. In this case, it is more convenient to provide it on the film leader side when loading the film. Further, in this embodiment, the film feeding device is provided on the cartridge chamber side of the camera, but it can also be provided on the film winding device side, and an embodiment in which it is provided on the back cover side of the camera is conceivable.

In the embodiment of the present invention, a known film winding mechanism can be used. During film rewinding, the caterpillar drive pulley 1 shown in FIGS. 1 and 2 can be made to rotate freely by unlocking the film winding mechanism, or can be driven in reverse. .

FIG. 6 is a perspective view of an embodiment in which the present invention is applied to an automatically loadable cartridge camera, with the back cover of the camera opened. FIG. 7 is a schematic diagram of the cartridge loading member and exposure frame with the back cover omitted. 13 is the conventional 35m/m used in this invention
A size cartridge is shown, 13a is a cartridge shaft, 13b is a film outlet slightly protruding in the tangential direction or substantially tangential direction of the body plate, and 14 is a small amount of film drawn out from the outlet 3 by the film manufacturer in advance. 11 is a camera body equipped with a lens L, a viewfinder F, and central functions of the camera; 19 is a back cover that can be opened and closed in the direction shown by the arrow A-A'; in this embodiment, the camera body 4; It is rotatably supported by a hinge (not shown) at the center of the bottom surface, and is stopped at a predetermined angle to expose a cartridge loading member 24, which will be described later. Reference numeral 24 denotes a cartridge loading member which allows the cartridge 13 provided between the camera body 11 and the back cover 19 to be dropped and loaded like a cassette, and is fixed to the back cover 19 in this example. 25 is a notch forming a cartridge storage chamber;
Reference numeral 32 indicates a guide slit for guiding the film leader section into the camera as the cartridge P is loaded into the storage chamber 7. In this case, the cartridge loading chamber 30 is on the right side, and the winding chamber 31 is formed on the opposite side across the exposure opening 16, but this layout is not limited to this embodiment.
The left and right sides may be reversed. When arranged in this manner, the cartridge P can be loaded and taken out while holding the cartridge shaft 13a, and the notch formed in the film leader section can be used to
The film leader 14 can be successfully guided into the slit 32. The film winding chamber 31 has an automatic film winding mechanism and a film winding shaft (not shown) therein.

The cartridge loading member 24 has a circular contour 25 on its right side that approximates the cross-sectional shape of the cartridge.
A portion 25a of the circular contour further has a notch along the tangential direction of the circular shape to regulate the manner in which the cartridge is loaded. In other words, Patrone 1
Loading is possible by bringing the recess formed by the film outlet 13a of No. 3 and the body plate into a state where it is engaged with a part of the contour, that is, the protrusion 25b. When the cartridge 13 is stored in the storage recess, its posture can be controlled. The protruding portion 25b may form a top portion 27 that is higher than the upper surface of the cartridge loading member 24 by a height H, as shown in FIG. 3a. 7th
In the case shown in the figure, when loading the cartridge P from above, the cartridge P can be dropped along the slope of the top portion 27, so that loading is particularly smooth. A guide member 26 parallel to the focal plane of the film at the time of photographing is provided on the protruding portion 8 and faces toward the winding chamber, and forms a film leader insertion slit 32 between it and the back cover 19. This guide member 26 is designed to prevent the film leader 13 from being damaged even if the film leader 14 is wrapped around the outer circumferential surface of the cartridge 13 due to the curling characteristic of the film leader 14 when the cartridge 13 is loaded.
4, the recess of the cartridge is connected to the protruding parts 25a and 25b.
Since the lower end of the film leader touches the upper surface of the guide member 26, the film leader is successively extended in the cartridge radial direction along the surface and is dropped into the slit, so that the leader section cannot be inserted. Make it extremely easy.

The guide member 26 has a length exceeding the exposure frame 16, and its tip 26a is curved downward. A notch 29 is provided around the exposure frame 16 to accommodate a guide member 26, and the outline shape of this is the same as that of the guide member 26. The right end of the notch and the running rail 1
7 is provided with a notch 28 for slightly protruding the film feeding device 21 shown in the embodiment shown in FIGS. Driven by. With this structure, when the cartridge 13 is loaded in the state shown in FIG. 6, the film leader section 14 is guided into the slit 32 and is supported in an extended state by the guide member 26. be done. When the back cover 19 is closed, the film loading member 24 and the guide member 26 provided on the back cover are respectively stored in the cartridge loading chamber recess 30 and the guide storage notch 29 on the camera body side, and from then on, they are not used for film travel. has no effect. At the same time, the film leader section is pressed against the running rail surface by a film pressure plate provided on the back cover (not shown), so that the perforation of the film leader section engages with the claw 22 of the film feeding device.

In this state, when the power switch or shutter button of the camera is operated, the film feeding device is activated and the film is pulled out. When the film leader is transported to a winding chamber, it is wound around a winding shaft by a known film winding mechanism (not shown).

As described above, in the film feeding device according to the present invention, it is possible to engage the claws with a large number of perforations during film feeding, and the arc portion of the claw 4 is parallel to the film feeding direction. Because the film can be fed by applying force to
It is possible to reliably feed the film without fear of causing cuts in the perforation of the film. If the present invention is applied to an automatic film loading camera as shown in Figs. 6 and 7, it is possible to feed the film reliably.
The figure also shows a camera in which film is automatically loaded by simply setting the film cartridge 13, aligning the perforation 15 of the film 14 with the film perflation engaging claw 22, and closing the camera back cover 14. It is also possible to create Moreover, since the present invention does not require a complicated structure, it can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the caterpillar removed from the driving pulley and driven pulley, Fig. 2 is a schematic plan view of the caterpillar engaged with the driving pulley and driven pulley, and Fig. 3 is a perspective view of the driven pulley. 4 is a diagram of another embodiment in which the drive mechanism of the caterpillar is changed; FIG. 5 is a partial perspective view of a camera to which the present invention is applied, with the back cover open; FIG. 6 7 shows a perspective view of another embodiment of the present invention, and FIG. 7 shows a perspective view of FIG. 6 with the back cover removed. 1... Caterpillar drive pulley, 2... Driven pulley, 3... Endless belt with claws, 21...
...Film feeding device, 24...Patrone loading member, 26...Guide member.

Claims (1)

[Scope of utility model registration request] The film in the cartridge is loaded from the axial direction of the cartridge, and in response to the closing of the back cover, the film feeding mechanism is activated, and the film perforation of the film leader protruding from the cartridge is operated. In a camera film feeding device that engages with a perforation row of the film and drives the film leader section in the direction of the film winding shaft, the perforation row of the film An endless belt type caterpillar equipped with a plurality of conical claws whose cross section is circular when cut along the surface is inserted into the cartridge loading member 24 from the photographing screen opening.
The film reader guide member 26 is provided at a position close to the camera body and below the storage compartment in the camera body, and the cartridge is loaded into a cartridge loading member fixed to the back cover 19 of the camera. The film leader is maintained in an extended state by the film leader guide member 26 extending from the member in the direction of the film winding axis, and the claw member is engaged with the film leader portion by closing the back cover in this state. A film feeding device for a camera, characterized in that it is possible to feed a film from a film leader section.