JP3001225B2 - Camera film feed mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding mechanism for a camera that feeds a film disposed at a predetermined position in a film path of a camera body in the camera along the film path.

(Prior Art) In a conventional film feeding mechanism for a camera, a sprocket and a sprocket driving means are arranged in such a manner that a patrone accommodating chamber and a film winding spool accommodating chamber are arranged at both ends of a camera body chassis. It is arranged in the chassis near the film take-up spool accommodating chamber.

(Problems to be Solved by the Invention) In the conventional camera configured as described above, if the camera is of a relatively heavy type, the camera body chassis is horizontally long and the balance is not very good. Even if you hold it, you must hold it firmly with both hands,
The so-called hold property is not good. In order to improve the holdability, the overall size of the outer shape including the rear lid of the current camera is reduced from the current size in the horizontal direction and the vertical size (along the optical axis of the photographing lens). In order to achieve this, the film take-up spool accommodating chamber is disposed behind the film path, and the film is applied to the spool in the film take-up spool accommodating chamber arranged in this manner. The film must be directed from the film path into the film take-up spool receiving chamber so that the surface can be wound radially inward of the spool. However, in the case of the conventional sprocket arranged on the camera body chassis, when the film take-up spool accommodating chamber is disposed behind the film path, the film can be guided from the film path into the film take-up spool accommodating chamber as described above. Absent.

The present invention has been made based on the above circumstances, and an object of the present invention is to deform the entire outer shape including the rear lid of the camera from the current oblong shape, for example, to improve the holdability of the camera. Even if the film take-up spool storage chamber is located behind the film path, the film moves from the film path into the film take-up spool storage chamber with respect to the spool in the spool storage chamber. It is an object of the present invention to provide a film feeding mechanism for a camera capable of guiding a film from a film path to a film winding spool housing so that the film can be wound toward the camera.

According to the present invention, which is used in a camera of the film auto-loading type to achieve the above-mentioned object, a film feeding mechanism of the camera comprises: a predetermined film path in a camera body opposed to a taking lens; A movable member which is drawn out of a patrone storage chamber disposed at one end of the film passage to a position, and which is provided so as to be able to approach and separate a film on which the emulsion-coated surface is opposed to the photographic lens; The movable member is rotatably supported by the member, and the movable member is arranged at the approach position, so that the film arranged at a predetermined position in the film path of the camera body comes into contact with the film from the side where the emulsion of the film is not applied. A sprocket having engaging claws for engaging with perforations formed in the film; The sprocket is rotationally driven in a state where the movable member is located at the approach position, and the film in the film path is accommodated in the patrone arranged at one end of the film path along the film path by the engaging claw of the sprocket. A sprocket driving means for feeding from the chamber to the other end of the film passage; rotatably provided on the movable member, wherein the movable member is arranged at an approach position so that the other end of the film passage is provided at the other end of the film passage. A spool disposed on the rear side of the camera opposite to the photographing lens and for winding the film fed to the other end of the film passage by the engagement claw of the sprocket. Features.

Another camera film feed mechanism according to the present invention used in a camera of the film autoloading type to achieve the above-mentioned object is: for a film arranged at a predetermined position in a film path of a camera body; A movable member provided so as to be able to approach / separate; rotatably supported by the movable member, an emulsion of the film is applied to the film at a predetermined position in the film path of the camera body by disposing the movable member at the approach position; A sprocket having an engaging claw that comes into contact with the non-surface side and engages with the perforation of the film; and the sprocket is rotationally driven in a state where the movable member is located at the approaching position so that the film in the film path is moved. Sprocket drive means for feeding along the film path by the engagement pawls of the sprocket;
In the sprocket, the engaging claw that engages with the perforation formed in the leading end portion of the film disposed at a predetermined position in the film passage of the camera body in the sprocket is located in the plurality of openings of the perforation. A perforation is provided to engage with a group of two mutually adjacent apertures that are spaced apart from each other and located at a leading end of the film in one of the plurality of apertures of the perforation. Done 1
In the engagement claw that engages with one of the openings, the engagement surface that engages with one side of the inner periphery of the one opening that is located on the side of the film passage in the direction in which the film travels in the inner periphery of the one opening is the sprocket. In the involute curve formed from the base end of the engaging surface on the circumferential surface with the peripheral surface around which the film is wound as the base circle, the curve corresponds to the height from the base end of the engaging surface to the height of the engaging claw. A camera body which is constituted by a line having a curvature smaller than that of the portion and which faces the engaging claw engaged with the perforation opening of the leading end portion of the film in the sprocket when the movable member is disposed at the approach position. Accommodates the engaging claw projecting from the perforation opening of the leading end portion of the film toward the emulsion-coated side of the film. Relief portion to prevent contact between the end are provided, and wherein a.

(Function) In the former film feeding mechanism of the camera, the emulsion is pulled out from a patrone storage chamber arranged at one end of the film passage to a predetermined position of the film passage facing the taking lens in the camera body. A movable member is provided so as to be able to approach and separate from the film whose surface is opposed to the photographing lens. A sprocket is rotatably supported by the movable member. The sprocket is formed on the film by contacting the film disposed at a predetermined position in the film path of the camera body from the side on which the emulsion of the film is not applied by disposing the movable member at the close position. It has an engagement claw that engages with the perforation. The sprocket driving means rotationally drives the sprocket in a state where the movable member is located at the approach position, and the film in the film passage is disposed at one end of the film passage along the film passage by the engaging claw of the sprocket. The film is fed from the cartridge storage chamber to the other end of the film passage.
The movable member is further provided with a spool rotatably, and the spool is disposed at the other end of the film path at the other end of the film path opposite to the photographing lens when the movable member is disposed at the approach position. The film is fed to the other end of the film path by the engagement claw of the sprocket.

The film feeding mechanism of the latter camera has a movable member provided so as to be able to approach and separate from a film disposed at a predetermined position in a film path of the camera body. A sprocket is rotatably supported by the movable member. The sprocket comes into contact with the film at a predetermined position in the film path of the camera body from the side on which the emulsion of the film is not applied by engaging the movable member at the approach position, and engages with the perforation of the film. Has a dovetail. With the movable member disposed at the approach position, the sprocket driving means drives the sprocket to rotate, and feeds the film in the film path along the film path by the engagement claws of the sprocket. In the sprocket, the engagement claw that engages with the perforation formed on the leading end of the film disposed at a predetermined position in the film path of the camera body,
At least one of said plurality of perforations
It is provided to engage with a group of two or more spaced apart adjacent openings.
Advancement of the film in the film path within the inner circumference of the one opening at an engagement claw that engages one opening located at the leading end of the film in one group of the plurality of openings of the perforation The engagement surface engaging with one side located on the side of the direction is an involute curve formed from the base end of the engagement surface on the peripheral surface with the peripheral surface around which the film is wound in the sprocket as a base circle. And a line whose curve is smaller than a portion corresponding to the height from the base end of the engaging surface to the height of the engaging claw. When the movable member is disposed at the approach position, the sprocket has a portion of the camera main body opposite to the engaging claw engaged with the perforation opening of the leading end portion of the film. A relief is provided for accommodating the engaging claw that protrudes from the perforation opening toward the emulsion coating surface of the film, and the protruding end of the engaging claw contacts the portion of the camera body. To prevent that.

(Embodiments) Hereinafter, cameras according to various embodiments and modifications of the present invention will be described in detail with reference to the accompanying drawings.

In the camera according to the first embodiment of the present invention,
As shown in FIGS. 1 and 2, a patrone storage chamber 12 is formed on the right side of the rear surface of the camera body chassis 10,
A film passage 14 is defined along the rear surface from the cartridge storage chamber 12 to the left side of the rear surface.

Film passage on the back of the front of the camera body chassis 10
A shooting aperture 16 penetrating to 14 is formed, and the shooting aperture
Reference numeral 16 is covered by a focal plane shutter unit 18 disposed on the front surface.

On the front of the camera body chassis 10, there are further provided a mirror box 20 disposed in front of the focal plane shutter unit 18 and holding a main mirror 19, and a mirror box.
A lens frame 24 disposed further forward of the lens 20 and supporting the photographing lens group 22 is supported.

On the top of the camera body chassis 10, there is a mirror box 20
A plurality of specially shaped mirrors 26a, 26b, 26c constituting a finder optical system are arranged above the mirror.

The camera body exterior housing 28 that covers the above-described various members supported on the front and top surfaces of the camera body chassis 10 swells forward of the patrone storage room 12 to form a grip portion 28a. A main condenser 30 for strobe is stored in a gap created between the cartridge storage chamber 12 and the interior space covered by the grip portion 28a. In the above-described camera, the strobe 32 is a camera body exterior housing.
It is supported on the upper surface of 28 so that it can be opened and closed.

The strobe reflector 32a of the strobe 32 is located in the recess on the upper surface when the strobe 32 is disposed in the closed position shown by the solid line in FIG. 2, and is protected from external force. When it is located at the open position shown by the dashed line, it is separated from the recess on the upper surface and directed toward the front of the camera.

The camera body exterior housing 28 also supports the eyepiece 34 at a position facing the mirror 26c arranged at the final position of the finder optical system.

The rear surface of the camera body chassis 10 is covered by a rear cover 36 rotatably supported on the left end of the rear surface.
1 and 2 is held at a closed position as shown in FIGS. 1 and 2 by a rear lid locking member (not shown in FIGS. 1 and 2) provided at the right end of the camera body chassis 10.

At the left end of the rear lid 36, a spool storage chamber 40 for rotatably storing a spool 38 is formed.
Is open at the left end of the film passage 14 on the rear surface of the camera body chassis 10. A sprocket 42 is disposed in the opening of the spool accommodating chamber 40, and the sprocket 42 and the spool 38 are selected by driving means (not shown in FIGS. 1 and 2) disposed in the rear lid 36. Driven.

A battery 44 for the main power supply of the camera is further housed in the rear cover 36.

In the camera of the above-described embodiment, the patrone storage chamber 12 is disposed at one end of the film passage 14 in front of the film passage 14, and the sprocket 42 and the spool storage chamber 40
Is disposed at the other end of the film passage 14 behind the film passage 14. The film 48 drawn from the patrone 46 stored in the patrone storage chamber 12 extends toward the sprocket 42 in the film path 14 and is wound around the sprocket 42 to be directed to the spool 38, thereby being directed to the spool 38. It is wound up with the emulsion coating surface facing inward in the radial direction of the spool 38.

When a shutter button (not shown) provided on the upper surface of the grip portion 28a pushes the camera body exterior housing 28, the main mirror 19 in the mirror box 20 rotates upward from the position shown in FIG. Next, when the focal plane shutter unit 18 is opened, the photographing lens group viewed through the eyepiece 34 immediately before the shutter button is pressed.
The image captured by the camera 22 is photographed in one frame area of the film 48 facing the photographing opening 16 of the film passage 14.

The main mirror 19 and the focal plane shutter unit 18 are rotated after the exposure time based on the exposure signal from the screen mat 20a in the upper opening of the mirror box 20 or the exposure meter arranged at an appropriate position on the camera body exterior housing 28. 1 is returned to the lower position shown in FIG.
It will also be closed.

When the photographing of one frame of the film 48 is completed, the spool 38 is driven to rotate, and the photographed area of the film guided toward the spool 38 by the sprocket 42 freely rotating from the film path 14 is covered by one frame as described above. The spool is wound with the application surface facing inward in the radial direction of the spool.

The camera of the embodiment described above is a camera of a film auto-loading system. When a new film 48 is loaded in the camera of the above-described embodiment, the rear lid 36 is opened as shown in FIG. 3 so as to expose the patrone storage chamber 12 and the film passage 14 on the rear surface of the camera body chassis 10. It is turned.

After the patrone 46 of the new film 48 is correctly stored in the patrone storage chamber 12, the film 48 drawn from the patrone 46 is extended along the film path 14 to the left end of the rear surface. Next, rotate the rear lid 36 to the closed position,
The camera body chassis 10 is held at the closed position by the above-mentioned rear lid locking member (not shown in FIGS. 1 and 2) provided at the right end.

When the rear lid 36 is rotated to the closed position, the sprocket
42 engages the engaging claw 42a formed on its peripheral surface with the perforation at the leading end of the film 48 in the film passage 14. Next, the driving means (not shown in FIGS. 1 and 2) first selectively drives the sprocket 42 by the above-described closing position holding operation of the rear lid locking member. As a result, the leading end of the film 48 in the film passage 14 is fed by the sprocket 42 to the spool 38 in the spool storage chamber 40.

After a sufficient time has elapsed for the leading end of the film 48 to reach the spool 38, the above-described driving means (not shown) selectively drives the spool 38 instead of the sprocket 42, and the sprocket 42 rotates freely. Be free. As a result, the leading end of the film 48 that has reached the spool 38 is wound around the peripheral surface of the spool 38 by engaging the perforations at the leading end with the engaging claws 38a formed on the peripheral surface of the spool 38. Taken.

After a sufficient time has passed for the leading end of the film 48 to be wound on the peripheral surface of the spool 38, the above-mentioned driving means (not shown) stops the selective driving of the spool 38. By such a procedure, the film auto-loading operation is performed.

FIG. 5 shows an enlarged view of the rear surface of the camera body chassis 10 defining the film path 14 and the main part of the rear cover 36 facing the rear surface.

As shown in FIG. 5, a lower patrone holder of a high friction material such as rubber or felt is provided on the lower surface of the patrone storage chamber 12.
An upper patrone holder 54 urged downward by a spring 52 is disposed at an upper end of the patrone storage chamber 12. These upper patrone holders 54
The lower patrone retainer 50 holds the patrone 46 mounted in a predetermined position in the patrone storage chamber 12 in a correct position in the correct position in the correct position.

On the rear surface of the camera body chassis 10, as is known, two pairs of upper and lower film guides 56 and 58 extending along an upper edge and a lower edge of the photographing opening 16 to serve as film guide rails. Projecting into the film passage 14. In this embodiment, the lower film guide 56b of the upper film guide pair 56 and the two film guides 58a, 58b of the lower film guide pair 58 have substantially the same length, but the upper film guide 56 In the film guide 56a, the left end side of the film path 14 is shorter than the lower film guide 56b.

A guide roller 60 extending vertically in the vicinity of the left side of the upper and lower film guide pairs 56 and 58 is disposed on the left end side of the film path 14 on the rear surface of the camera body chassis 10, and the guide roller 60 is The upper end and the lower end are rotatably supported on the rear surface by a guide roller retainer 62.

The upper film guide pair on the back of the camera body chassis 10
A film passage above the 56 and near the left edge of the shooting aperture 16
An upper film retainer 64 projecting into and defining the upper end of the film path 14 is formed. Upper film holder 64
Projecting end is bent downward to form a film lifting prevention protrusion 64a.

As shown in FIG. 4, the leading end of the film 48 extending along the film path 14 from the patrone 46 mounted in a predetermined position in the patrone storage chamber 12 in a correct posture has an upper edge formed on the upper film retainer 64. The contact makes the upward inclination restricted, and the film lifting prevention projection 64a of the upper film holder 64 prevents the camera body chassis 10 from rising backward from the film path 14.

As shown in FIG. 5, a pressure plate 66 is attached to the inner surface of the rear lid 36 via a pressure plate pressing leaf spring 66a. When the rear lid 36 is located at the above-described closed position, the pressure plate pressing plate 66 Spring
The elastic force of 66a presses the film 48 in the film path 14 onto the upper film guides 56a and 58a of the upper and lower film guide pairs 56 and 58, respectively. As a result, the film 48 is also pressed onto the guide roller 60 outside the pressure plate 66.

In FIG. 5, the spool 38 housed in the spool housing chamber 40 of the rear lid 36 and the sprocket 42 arranged at the entrance opening of the spool housing chamber 40 are unitized by a common drive mechanism 68. The situation is shown.

Here, the spool 38 has a hollow cylindrical shape, and the bidirectional motor 70 as a drive source of the drive mechanism 68 is disposed concentrically with the spool 38 in the internal space of the spool 38.

As shown in FIG. 5, engaging claws 42a and 42b for engaging with the upper and lower perforations of the film 48 are formed in a predetermined arrangement at the upper end and the lower end of the peripheral surface of the sprocket 42, respectively. ing.

As shown in FIG. 6, three engaging claws 42a at the upper end of the peripheral surface of the sprocket 42 are arranged at equal intervals in the circumferential direction, and the engaging claws 42b at the lower end of the peripheral surface of the sprocket 42 are arranged in the circumferential direction. Are arranged at equal intervals. Three engaging claws 42 at the upper end
a engages with every other one of the plurality of engaging holes of the perforation on the upper side of the film 48, and has six engaging claws 42 at the lower end.
b continuously engages with the plurality of engagement holes of the perforation on the lower side of the film 48.

The planar shape of the engagement claw 42a at the upper end and the engagement claw 4 at the lower end
This is different from the planar shape of 2b, which will be described later in detail.

As shown in FIG. 5, a sprocket rotation measuring unit 72 using a photo interrupter is connected to the upper portion of the sprocket 42.

FIG. 5 also shows a film guide member 74 attached to the entrance opening of the spool storage chamber 40 of the rear lid 36 so as to face the sprocket 42. The guide surface 74a of the film guide member 74 facing the sprocket 42 has a curved surface along the peripheral surface of the facing sprocket 42.

The guide surface 74a of the film guide member 74 has a camera body chassis 10 for closing a gap formed between the left end of the rear surface of the camera body chassis 10 and the left end of the rear lid 36 rotatably connected thereto. A film guide sheet insertion opening 78 into which the free end of the film guide sheet 76 fixed together with the guide roller retainer 62 is inserted is formed at the left end of the rear surface.

FIG. 5 further shows the above-mentioned rear lid locking member 80 for holding the rear lid 36 in the closed position. The rear lid locking member 80 is attached to the right end surface of the camera body chassis 10 so as to be vertically movable, and is urged upward by urging means 82. Below the rear cover locking member 80, a rear cover switch SW1 that is connected to a control unit described later that is connected to a common drive mechanism 68 for the spool 38 and the sprocket 42 is disposed.

When the rear lid 36 moves from the open position to the closed position, the rear lid locking member 80 engages with an engagement claw 84 formed on the right end of the rear lid 36.
Is pushed down and once lowered, the rear lid switch SW1
To turn on the rear cover switch SW1. When the rear lid 36 arrives at the closed position, the rear lid locking member by the engaging claw 84 of the rear lid 36
The downward pressing of 80 is released and the rear lid prevention member 80 is biased.
Due to the urging force of 82, the rear cover 36 is moved upward until it engages with the engaging claw 84.

The left end of the rear cover 36 and the left end of the rear surface of the camera body chassis 10 when the rear cover 36 is placed in the open position for the film auto-loading operation are shown in an enlarged scale.
In the drawing, a first film holding lever 86 extending from the entrance of the spool storage chamber 40 to a position far from the entrance on the peripheral surface of the spool 38 in the spool storage chamber 40 of the rear lid 36 is shown.
A second film holding lever 88 extending from a position on the inner surface of the spool storage chamber 40 far from the entrance of the spool storage chamber 40 to a position on the peripheral surface of the spool 38 close to the entrance.
Are shown.

The first and second film holding levers 86 and 88 have an end on the inner surface side of the spool storage chamber 40 rotatably supported on the inner surface and a film holding roller 90 on the end on the spool side. Are rotatably supported.

The first and second film holding levers 86 and 88 are further provided so as to press the film holding roller 90 onto the peripheral surface of the spool 38 by an urging member 92 disposed between the first and second film holding levers 86 and 88. It is being rushed.

FIG. 8 further shows a part of the film guide rail 94 formed on the guide surface 74a of the film guide member 74. The film guide rail 94 will be described later in detail.

FIG. 9 schematically shows the structure of the common drive mechanism 68 of the spool 38 and the sprocket 42 in an exploded state.
FIG. 10 is a schematic plan view of the above structure in a state where they are combined with each other.

As shown in FIGS. 9 and 10, the drive gear 70a fixed to the output shaft of the bidirectional motor 70 disposed in the internal space of the spool 38 meshes with the input gear 96a of the reduction gear train 96. The planetary gear 100 rotatably supported by the other end of the planetary arm 98 rotatably supported by the exit gear 96b at one end is engaged with the exit gear 96b of the reduction gear train 96. The planetary gear 100 also meshes with the internal teeth 102a of the arcuate internal tooth member 102 fixed to the chassis 68a of the drive mechanism 68.

On both sides of the internal gear member 102 on the orbit of the planetary gear 100,
Spool drive gear 38b formed at the lower end of spool 38
And a sprocket drive gear train 42c meshed with the lower end of the sprocket 42.

Prior to the start of the film auto-loading operation, the planetary gear 100 is meshed with the internal teeth 102a of the internal gear member 102 as shown in FIGS.

FIG. 11 schematically shows a control circuit 104 connected to the bidirectional motor 70 of the drive mechanism 68 as shown in FIG. 9 for controlling the operation of the drive mechanism 68.

In the control circuit 104, one terminal of the two-way motor 70 is connected to the emitter of the transistor T1 and the collector of the transistor T2, and the other terminal is connected to the emitter of the transistor T3 and the collector of the transistor T4. The collector of the transistor T1 and the emitter of the transistor T2 are connected to the positive and negative poles of the power battery 44, and the bases of the transistors T1 and T2 are connected to the CPU.
Are connected to the C1 and C2 terminals, respectively. The collector of the transistor T3 and the emitter of the transistor T4 are connected to the positive pole and the negative pole of the power battery 44, and the bases of the transistors T3 and T4 are connected to the C3 and C4 terminals of the CPU, respectively. The resistor R1 connected to the input terminal of the light emitting element of the sprocket rotation measurement unit 72 and the collector of the phototransistor of the sprocket rotation measurement unit 72 are further connected to the positive pole of the power supply battery 44. Is further connected to the output terminal of the light emitting element. The emitter of the phototransistor is connected to the C5 terminal of the CPU.

The CPU is further connected at its C6 and C7 terminals to a rear lid switch SW1 linked to the rear lid locking member 80 and a shutter release switch SW2 linked to the aforementioned shutter button (not shown).

When the control circuit 104 configured as described above rotates the drive gear 70a of the bidirectional motor 70 in the forward direction (counterclockwise direction in FIG. 10), the C1 and C2 terminals of the CPU are set to low, and The C3 and C4 terminals are pulled high. Conversely, when the drive gear 70a of the bidirectional motor 70 is rotated in the reverse direction (clockwise in FIG. 10), the C1 and C2 terminals of the CPU are set to high, and the C3 and C4 terminals are set to low. Is done. Further, the driving gear 70 of the bidirectional motor 70
To stop the rotation of a, the C1, C2, C3, and C4 terminals are pulled high.

In FIG. 12, the rear lid 36 is placed in the open position, and after the new patrone 46 is correctly mounted in the patrone storage chamber 12 of the camera body chassis 10, the leading end of the film 48 pulled out from the patrone 46 is attached to the camera body chassis. Extend along the film path 14 on the back of 10 to the left end of the film path 14,
Afterwards, the rear lid for film auto loading work
When the film 48 is rotated to the closed position, the film 48 comes into contact with the guide surface 74a of the film guide member 74 of the rear lid 36 and the film guide sheet while the leading end of the film 48 rotates from the open position to the closed position. The possibility of the film 48 detaching from the film path 14 or the patrone 46 being displaced from a predetermined position in the patrone storage chamber 12 due to the force applied to the tip of the cartridge is indicated by a two-dot chain line.

However, in the camera of the embodiment of the present application, the above possibility is caused by the film passage 14 on the rear surface of the camera
Upper and lower patrone holders 50 and 54 in the upper film holder 64 and the patrone storage chamber 12 (see FIG. 5).
Is reliably prevented.

FIG. 13 is a flowchart showing how the drive mechanism 68 is controlled by the control circuit 104 from the start to the end of the film auto-loading operation.

That is, the rear cover 36 is moved to the closed position from the state shown by the solid line in FIG. 12, and the rear cover 36 is moved to the closed position by the rear cover closed position locking member 80 (see FIG. 5) of the camera body chassis 10. By being held, the rear lid switch SW1 linked to the rear lid closed position locking member 80 is turned on and off, whereby the control circuit 104
CPU rotates the drive gear 70a of the bidirectional motor 70 forward (rotates counterclockwise in FIG. 10). Thus, the sun gear 96b of the reduction gear train 96a also rotates forward, and as shown in FIG. 14, the planetary gear 100 rotates forward around the sun gear 96b. This planetary gear 100 is disengaged from the internal teeth 102a of the internal gear member 102 and meshes with the sprocket drive gear train 42c of the sprocket 42,
The rotational force from the drive gear 70a of the bidirectional motor 70 is transmitted to the sprocket 42.

The rear sprocket 36 is located in the closed position so that the sprocket
Since the peripheral surface of the film 42 moves to the front of the film 48 in the film path 14, the upper end of the sprocket 42 is located in the upper half of the leading end of the film 48 that was located at the left end in the film path 14. As shown in FIG. 15, the emulsion coating surface at the leading end of the film 48 is pressed onto the guide roller 60 on the rear surface of the camera body chassis 10.

The left end of the rear surface of the camera body chassis 10 is provided with a fifteenth protrusion to prevent contact between the engaging claw 42a at the upper end of the sprocket 42 and the engaging claw 42b at the lower end (see FIG. 5). As shown in the figure, a relief recess 10a that is recessed forward is formed.

The sprocket 42 pressed by the leader at the leading end of the film 48 rotates counterclockwise as shown by the arrow in FIG. 14 by the rotational force from the driving gear 70a of the bidirectional motor 70, as shown in FIG. An engaging claw 42a at the upper end of the sprocket 42 is engaged with one of a plurality of openings of an upper perforation 48a formed along the upper edge of the reader, and the film 48 is moved along the film path 14 and the camera body chassis. The film guide sheet 76 is moved between the left end of the rear surface of the rear cover 10 and the left end of the rear cover 36 toward the guide surface 74a of the film guide member 74 of the rear cover 36.

The film 48 moved by the sprocket 42 is moved to the 16th position by the leading end of the leader contacting the film guide sheet 76 and the guide surface 74a of the film guide member 74.
As shown in the figure, the direction of movement of the sprocket 42 is changed in the circumferential direction, and then, as shown in FIG. 17, the sprocket 42 is pressed onto the peripheral surface of the spool 38 by the rollers 90 of the first film pressing lever 86.

The CPU that measures the rotation amount of the sprocket 42 (ie, the moving distance of the film 48 by the sprocket 42) based on the number of output pulses from the sprocket rotation measurement unit 72, determines that the number of output pulses passes the front end of the film 48 to the film path 14 As shown in FIG. 16, when the number of pulses becomes equal to or greater than a predetermined pulse number N1 required for feeding from the left end to the peripheral surface of the spool 38, the timer A is operated and the driving gear 70a of the bidirectional motor 70 is operated. Reverse the direction of rotation of. As a result, the sun gear 96b of the reduction gear train 96a also reverses, and as shown in FIG. 18, the planetary gear 100 reverses around the sun gear 96b. The planetary gear 100 is separated from the sprocket drive gear train 42c of the sprocket 42 so that the bidirectional motor 7
Release the drive of sprocket 42 by 0 and sprocket 42
Can be freely rotated, and the internal teeth 1 of the internal tooth member 102 can be freely rotated.
02a and meshes with the inner teeth 102a.
18 and meshes with the spool drive gear 38a of the spool 38 as shown in FIG. 18 to transmit the rotational force from the drive gear 70a of the bidirectional motor 70 to the spool 38.

The spool 38 driven by the rotational force has one of the plurality of engaging claws 38a at the upper end thereof, as shown in FIG. 19, the upper perforation of the leader at the leading end of the film 48 on the spool 38.
Engaging one of the plurality of openings in 48a, the leader is wound up with the emulsion application surface facing radially inward of spool 38.

The CPU that measures the rotation amount of the sprocket 42 (ie, the moving distance of the film 48 by the sprocket 42) based on the number of output pulses from the sprocket rotation measurement unit 72 indicates that the output pulse number indicates that the front end of the film 48 When the number of pulses N2 is equal to or greater than the predetermined number of pulses N2 required for reliable winding, the driving gear 70a of the bidirectional motor 70
Is stopped and the timer A is reset.

Note that the output pulse number from the sprocket rotation measurement unit 72 does not reach the predetermined pulse number N2, and the time counted by the timer A is a predetermined time required for the spool 38 which rotates for film winding to make a half rotation. If it is equal to or greater than T1, the CPU determines that the film autoloading operation has failed,
The rotation of the drive gear 70a of the bidirectional motor 70 is stopped, and the timer A is reset.

The failure of the film auto-loading operation is indicated by the CPU on a data display panel (not shown) provided on the surface of the camera body outer housing 28 (see FIG. 1 or 2) or the outer surface of the rear cover 33. You. In this case, it is necessary to open the rear lid 33 and operate them so that the patrone 46 and the film 48 are properly loaded in the patrone storage chamber 12 and the film passage 14.

Fig. 20 shows that a plurality of photos were taken after the film autoloading operation was completed.
48 shows a state in which the photographed area is wound up on the spool 38 in a layered manner. Here, the photographed area of the film 48 wound in a layer on the spool 38 is firstly moved through the film pressing rollers 90 of the first and second film pressing levers 86 and 88 in the patrone storage chamber 12. And the second
Since the urging force of the urging members 92 of the film pressing levers 86 and 88 is pressed onto the spool 38, no slack occurs on the spool 38.

FIGS. 21 and 22 show the advantages of the film guide provided on the rear surface of the camera body chassis 10 during the film auto-loading operation.

Three engaging claws at the upper end of the sprocket 42 that started rotating immediately after the start of the film auto-loading operation.
If the first one of the leaders of the film 48 located at the left end in the film path 14 in the film path 14 does not engage with any of the plurality of openings of the upper perforation 48a of the leader, As shown in FIG. 21, the unengaged engaging claw 42a forms a bridge between a plurality of openings of the upper perforation 48a of the reader in the escape portion 10a at the left end of the rear surface of the camera body chassis 10. Extrude. At this time, since the left end side of the uppermost film guide 56a is short, the upper edge of the leader is gently pushed into the escape portion 10a as shown in FIG. For this reason, in a situation where the flexibility of the film 48 is reduced at low temperatures, the film 48
Even if the above-mentioned extrusion of the upper end portion of the leader at the tip of the leader occurs, the film 4 as well as the bridge between the plurality of openings of the upper perforations 48a of the leader will be described.
There is no damage such as bending or cutting on 8. Such damage is likely to cause film jamming during film autoloading and damage greater than film 48.

If the film guide 56a is present, as shown in FIG. 21, the unengaged engaging claw 42a causes the bridge between the plurality of openings of the upper perforation 48a of the leader to move to the rear surface of the camera body chassis 10. As shown in FIG. 23, the upper edge of the leader is pushed between the left end of the film guide 56a and the left end of the film guide 56b forming a pair with the film guide 56a. Forced to get into the narrow gap.

In a situation where the flexibility of the film 48 is reduced at a low temperature, the upper edge of the leader forced to enter such a narrow gap is liable to be damaged such as bending or cutting.

FIG. 24 is a flowchart showing a state in which the drive mechanism 68 is controlled by the control circuit 104 while the photographing is performed one frame at a time until the film end after the film auto-loading is completed.

That is, when the above-mentioned shutter release button (not shown) is pressed for photographing one frame of the film 48 after the completion of the film auto-loading, the shutter release switch SW2 (see FIG. 11) linked with the shutter release button is turned on. As a result, the focal plane shutter unit 18 (see FIG. 1) is opened for a predetermined time, and the photographing of one frame is completed. After this, the timer B starts measuring the passage of time, and at the same time, the driving gear 70a of the bidirectional motor 70 of the common driving means 68 (see FIG. 18) for the sprocket 42 and the spool 38 is rotated in reverse (the clock in FIG. 18). Direction). As a result, the planetary gear 100 is urged in the direction toward the spool drive gear 38a of the spool 38, but at the end of the film auto-loading, the planetary gear 100 of the drive means 68 is driven by the spool drive of the spool 38 as shown in FIG. Since the gear 38a is stopped while being engaged with the gear 38a, the rotational force from the drive gear 70a of the bidirectional motor 70 is immediately transmitted to the spool 38, and the spool 38 starts winding the filmed area of the film 48. The CPU measures the amount of movement of the film 48 moved in the film path 14 in association with the above-described winding operation of the filmed area of the film 48 by the number of pulses emitted from the sprocket rotation measurement unit 72 provided on the sprocket 42. When the number of pulses is equal to or greater than the predetermined value N3 corresponding to the feed of one frame of the film 48, the bidirectional motor
The reverse rotation of the drive gear 70a of 70 is stopped, and the timer B is reset. This completes the winding operation for one frame of the film 48 by the spool 38. The number of pulses emitted from the sprocket rotation measuring unit 72 during the winding operation of one frame of the film 48 is equal to the predetermined value N3.
Is reached, and when the time measured by the timer B is longer than the predetermined maximum time required for winding one frame of the film 48, it is determined that the film is the end, and the reverse rotation of the drive gear 70a of the bidirectional motor 70 is performed. Stop. At the same time, measurement of the passage of time by the timer C is started, and the drive gear 70a of the bidirectional motor 70 is rotated forward (toward the counterclockwise direction in FIG. 18) tonight. The time measured by the timer C is equal to the driving gear 70.
The predetermined time T3 required for the planetary gear 100 revolving in the counterclockwise direction in FIG. 18 to re-engage the internal teeth 102a of the internal gear member 102 again sufficiently as shown in FIG. Is exceeded, the rotation of the drive gear 70a of the bidirectional motor 70 is stopped, and the timer B and the timer C are stopped.
Reset both.

And the film end is the camera body exterior housing
The data is displayed by the CPU on a data display panel (not shown) provided on the surface of 28 (see FIG. 1 or FIG. 2) or the outer surface of the rear lid 33.

When the planetary gear 100 re-engages with the internal teeth 102a of the internal gear member 102 as shown in FIG. 10, both the sprocket 42 and the spool 38 become freely rotatable, and thereafter the patrone in the patrone storage chamber 12 is placed. Manual or camera body chassis with 46 film take-up shafts in film take-up direction
The filmed area of the film 48 wound in layers on the spool 38 is rewound onto the film winding axis of the patrone 46 by being rotated by a film winding motor (not shown) arranged in 10. Can be done.

In FIG. 25, in preparation for the film auto-loading operation, from the patrone 46 in the patrone storage room 12 at the right end of the rear surface of the camera body chassis 10 to the left end of the rear surface along the film passage 14 on the rear surface. Even when the leader positioned above the leading end of the extended film 48 is slightly inclined with respect to the rotation center axis of the sprocket 42 as shown by a two-dot chain line in FIG. The engaging claw 42a at the upper end of the sprocket 42 on the rear lid 33 that has been turned from the open position to the closed position for the start is securely engaged with the plurality of openings of the upper perforation 48a formed on the leader. Engaging claw 42 devised for
The shape of a is shown enlarged. In other words, the upper end surface of the devised engagement claw 42a is an inclined surface whose front end is obliquely machined.

Figures 26 and 27 show the film under hot and humid conditions.
When the film 48 is soft, the leader of the leading end of the film 48 is hardly engaged with the engaging claw 42a on the sprocket 42 during the film auto-loading operation.
In order to effectively prevent the film separation member 108 from becoming detached from the film guide member 74, the film separation projection 108 formed at the upper end of the inner surface of the sprocket storage chamber 40 in a direction opposite to the film guide member 74 with respect to the sprocket 42. Is shown. Here, FIG. 27 is a schematic longitudinal sectional view taken along line AA of FIG. The film separation protrusion 108 is inclined from the sprocket 42 toward the peripheral surface of the spool 38, and the leading end of the leader of the fill 48, which is wound on the sprocket 42 in the film auto-loading operation and is not separated from the sprocket 42, is shown in FIG. As shown in FIG. 6, the sprocket 42 is separated from the sprocket 42 and then slid to guide the moving direction toward the peripheral surface of the spool 38.

FIGS. 28 and 29 show a film as a film guide partially formed at the left end of the escape portion 10a formed at the left end of the rear surface of the camera body chassis 10 so as to face the sprocket 42. The guide projection 108 is shown schematically. FIG. 29 is a schematic longitudinal sectional view taken along the line BB of FIG.

Film guide projection 1 formed on the left end of escape portion 10a
08, among the plurality of engagement claws 42a at the upper end of the sprocket 42 immediately after the start of the above-described film auto-loading, the one that first approaches the leader at the leading end of the film 48 is the plurality of upper perforations 48a of the leader. In the case where the leader is not immediately engaged with one of the openings, the leader is pushed into the escape portion 10a as shown in FIG. In addition to this, the engaging claw 42a eventually engages with one of the plurality of openings of the upper perforation 48a of the leader so that the tip of the leader becomes sprocket as shown in FIG.
Guide surface 74a of film guide member 74 by rotation of 42
When the tip is moved toward the sprocket 42
Along the peripheral surface of the film guide member 74 to smoothly slide on the guide surface 74a of the film guide member 74.

In FIG. 31, immediately after the start of the film auto-loading, the film 48 is first engaged with the plurality of openings of the upper perforation 48a of the leader at the leading end of the film 48 to move the film 48 from the film passage 14 into the spool accommodating chamber 40. The characteristic planar shape of the plurality of engaging claws 42a at the upper end of the sprocket 42 used for starting is shown in an enlarged manner.

As can be seen from FIG. 31, the tooth surfaces Z1 of the plurality of engaging claws 42a located on the front side in the rotation direction of the sprocket 42 (counterclockwise direction in FIG. 31) are adapted to be easily engaged with the film 48. A plurality of engaging claws, which are constituted by a line having a curvature smaller than the involute curve 110 having the peripheral surface of the sprocket 42 as a base circle, for example, a line inclined by α, and located rearward in the rotation direction of the sprocket 42.
Each tooth surface Z2 of 42a is constituted by the above-mentioned involute curve similarly to the tooth surface of the tooth of the conventional gear. Because of this,
The tooth surface Z1 located on the front side in the rotation direction has an involute curve 11
In the case of being constituted by 0, the engaging claw 42a engaged with the opening of the upper perforation 48a of the leader at the leading end of the film 48 moves away from the film path 14 due to the elasticity of the leading end of the film 48 as shown in FIG. As shown by the two-dot chain line, the engaging claw 42a with the opening of the upper perforation 48a
Can be effectively prevented from being easily disengaged, and the perforation can be prevented from being lost when the engagement is released while sliding from the engagement claw 42a.

FIG. 32 shows that a plurality of engaging claws 42a at the upper end of the sprocket 42 are connected to the upper perforation 48 of the leader at the leading end of the film 48 immediately after the start of the film automatic loading.
Sprocket 4 just engaged with multiple openings in a
While the film 48 is being fed by the second rotation, the lower edge of the leader at the leading end tends to be separated from the peripheral surface of the sprocket 42. This tendency is due to the fact that the film 48 tends to be curved in the width direction so as to make the emulsion-coated surface concave.

When the tendency described above increases, the leader at the leading end of the film 48 separates from the peripheral surface of the sprocket 42 and the spool 38
Not only does the plurality of engaging claws 42a at the upper end of the sprocket 42 hang down downwardly toward the peripheral surface of the sprocket 42, but also the film 48 formed by the engaging claws 38a of the spool 38 is easily disengaged. It becomes difficult to engage the upper perforations 48a of the leader at the tip of the head with the plurality of openings.

FIG. 33 shows an enlarged detail of the film guide rail 94 formed on the guide surface 74a of the film guide member 74 in order to effectively prevent the above-mentioned tendency.

On the guide surface 74a of the film guide member 74, the film guide rail 94 is formed so as to approach above and below the rotation trajectory of the engaging claw 42a at the upper end of the sprocket 42, as well as the lower edge of the sprocket 42. Engaging claw
An engagement claw 42a at the upper end of the sprocket 42 is formed so as to approach also above and below the rotation locus of 42b.
And an engagement claw 42b at the lower end thereof is formed substantially at the center. These film guide rails 94
It extends horizontally in parallel with the rotation trajectories of the engagement claws 42a, 42b at the upper and lower ends of the sprocket 42, and is more inward than the rotation trajectory of the projected ends of the engagement claws 42a, 42b in the radial direction of the sprocket 42. It protrudes to one side.

Therefore, immediately after the start of the film auto-loading, the upper perforations 48a and the lower perforations are engaged with the engagement claws 42a and 42b at the upper end and the lower end of the sprocket 42 in the escape portion 10a formed on the left end of the rear surface of the camera body chassis 10 immediately after the start of the film auto loading. The film 48 engaged with the side perforations 48b (see FIG. 32), while in contact with the sprocket 42, tends to bend in the width direction to make the emulsion coated surface concave. The upper and lower edges of the upper and lower perforations 48a and 48b are pressed by the film guide rail 94 of the film guide member 74 toward the bases of the engaging claws 42a and 42b at the upper and lower ends. Therefore, the engagement claws of the upper end and the lower end of the sprocket 42 with respect to the upper perforations 48a and the lower perforations 48b of the film 48 The disengagement of 42a, 42b is effectively prevented.

The film guide rail 94 formed substantially at the middle between the engaging claw 42a at the upper end of the sprocket 42 and the engaging claw 42b at the lower end of the sprocket 42 has a film auto-loading as shown by a two-dot chain line in FIG. Immediately after starting the sprocket 42
While the film 48 is fed by the rotation of the sprocket 42 in a state where the plurality of engaging claws 42a at the upper end of the film 48 are merely engaged with the plurality of openings of the upper perforation 48a of the leader at the leading end of the film 48, The lower edge of the leader at the tip end is surely prevented from separating from the peripheral surface of the sprocket 42.

FIGS. 34 and 35 show that the engagement claws 42a at the upper end of the sprocket 42 are arranged so as to engage with every other opening of the upper perforation 48a of the leader at the leading end of the film 48. Shows the benefits provided.

That is, immediately after the start of the film auto-loading, the engaging claw 42 at the upper end of the sprocket 42 is located at the second position from the top among the plurality of openings of the upper perforation 48a of the leader at the leading end of the film 48 as shown in FIG. When the leading end of the leader abuts on the film guide rail 94 of the film guide member 74 and is guided along the outer peripheral surface of the sprocket 42 in a state where the leader is first engaged with the opening to be engaged, the abutment of the leader Even if the area between the tip and the second opening slightly rolls up as shown in FIG. 35, the area of the leader is sprocketed.
It can smoothly and smoothly follow the outer peripheral surface of 42.

On the other hand, the engaging claw 42a at the upper end of the sprocket 42
Are arranged at regular intervals so as to continuously engage with the plurality of openings of the upper perforation 48a of the leader at the leading end of the film 48, the leading end of the leader is kept in the same state as described above. When the film guide member 74 comes into contact with the film guide rail 94 and is guided along the outer peripheral surface of the sprocket 42, the region between the leading end of the leader and the second opening slightly rolls up due to the contact. If this is the case, as shown in FIG. 36, the engaging claw 42a located immediately before the first engaging claw 42a is about to face the film guide rail 94 of the film guide member 74, and is further turned up. Thereby, the distance along the outer peripheral surface of the sprocket 42 from the second opening to the opening located at the first position from the tip of the leader is shifted from the first engaging claw 42a. Engagement claw 4 located immediately before
Since the distance is different from the distance up to 2a, the engagement claw 42a located immediately before the upper perforation 48a cannot be engaged with the opening located first from the tip of the leader in the upper perforation 48a.

The engaging claw 42a that does not engage with the first opening is formed by a pair of film guides that are located above and below the engaging claw 42a in a region between the plurality of openings of the upper perforation 48a of the reader with which the engaging claw 42a contacts. Pressing into the gaps between the rails 94 causes film jamming and damage to the pushed-in area of the film 48 leader.

38 and 39, in order to engage every other engaging claw 42a at the upper end of the outer peripheral surface of the sprocket 42 with the plurality of openings of the upper perforation 48a of the leader, FIG. As shown, two other arrangements capable of exhibiting the same effect as three arrangements at equal intervals in the circumferential direction are shown.

In FIG. 38, two engaging claws 42a are arranged at equal intervals in the circumferential direction at the upper end of the outer peripheral surface of the sprocket 42 so as to engage with every two openings in the upper perforations 48a. 39, only one engaging claw 42a is arranged at the upper end portion of the outer peripheral surface of the sprocket 42 so as to engage every six openings with the plurality of openings of the upper perforation 48a.

FIGS. 40 and 41 show yet another arrangement of the engagement claws at the upper end of the outer peripheral surface of the sprocket.
In this case, the leading end of the film 48 is engaged continuously with two of the plurality of openings of the upper perforation 48a of the leader, and is not engaged with at least one opening until the next engagement with the two openings. Engagement claws 42c, 42d
Are arranged on the outer peripheral surface.

Here, the engaging claw 42c is disposed in front of another engaging claw 42d in a predetermined rotation direction of the sprocket 42 for the film automatic loading operation. The tooth surfaces on both sides of the front engaging claw 42c are lines having a curvature smaller than an involute curve using the peripheral surface of the sprocket 42 as a base circle, like the engaging claw 42a shown enlarged in FIG. 31, for example. It is composed of a line Z1 inclined by α and an involute curve Z2, and the tooth surfaces on both sides of the rear engaging claw 42d are composed of an involute curve Z2.

The sprocket 42 having the two pairs of engaging claws 42c and 42d arranged as described above has a plurality of openings in the upper perforations 48a of the leader at the leading end of the film 48 immediately after the start of the film auto-loading operation. When first engaged with the opening located closest to the tip of the leader among the engaging claws 42c, the engaging pawl 42c forms a pair and is located behind the engaged pawl 42c. Engagement claw 4
2d engages with the opening located at the second closest position to the tip of the leader among the plurality of openings as the sprocket 42 rotates. The rotational force from the sprocket 42 is transmitted to the upper perforation 48a of the leader at the leading end of the film 48 via a pair of engaging claws 42c and 42d.
The film 48 passes through the film path by rotation of the sprocket 42.
It is fed into the spool storage chamber 40 from the inside.

In this case, the transmission of the rotational force from the sprocket 42 to the leader of the leading end of the film 48 immediately after the start of the film auto-loading operation is performed by the pair of engaging claws 42c and 42d of the sprocket 42 and the leading end of the film 48. Since the rotation is performed in combination with the upper perforation 48a of the leader, the rotational force is dispersed and applied to each of the two openings in the upper perforation 48a with which the pair of engaging claws 42c and 42d are engaged.

Therefore, when the flexibility of the film 48 is lost at a low temperature or when a large force is required for pulling out the film 48 from the patrone 46 for some reason, the upper perforation 48 of the leader at the leading end of the film 48 is used.
a can be effectively prevented from being damaged.

As shown in FIG. 43, the sprocket 42 having the two pairs of engaging claws 42c and 42d arranged as described above has the engaging claw 42d immediately after the start of the film auto-loading operation. Upper perforation
When the sprocket 42 is first engaged with the opening located closest to the tip of the leader among the plurality of openings 48a, the film 48 is rotated by the engaging claws 42d in the film passage 14 with the rotation of the sprocket 42. Is moved toward the guide surface 74a of the film guide sheet 76 or the film guide member 74, and the leading end of the leader is guided by the guide rail 94 of the guide surface 74a of the film guide sheet 76 or the film guide member 74.
As shown in FIG. 44, the engagement of the engagement claw 42d with the opening is released by receiving the resistance.

Here, when the sprocket 42 continues to open further, the next pair of engaging claws 42c engages with the opening located at the second closest position to the tip of the leader among the plurality of openings of the upper perforation 48a, The engaging claw 4 which is paired with the engaged engaging claw 42c and is disposed behind the engaged engaging claw 42c.
2d engages with the opening located third closest to the tip of the leader in the rear opening as the sprocket 42 continues to rotate. The rotational force from the sprocket 42 is applied to the film 48 via a pair of engaging claws 42c and 42d.
The film 48 is transmitted to the spool accommodating chamber 40 from the film passage 14 by the rotation of the sprocket 42.
Since there is a distance corresponding to two intervals between the plurality of openings of the upper perforation 42a between the engaged engaging claw 42c and another pair of engaging claws 42d located in front thereof, the second The area of the leader from the opening to the tip of the leader is
As shown in FIG. 45, with the further rotation of the sprocket 42, the engaging claw 42c engaged by the above-described action of the guide rail 94 on the guide surface 74a of the film guide member 74.
The film is smoothly formed on the outer peripheral surface area of the sprocket 42 between the sprocket 42 and another pair of engaging claws 42d located in front of the sprocket 42 without clogging the film.

As shown in FIG. 46, the sprocket 42 having the two pairs of engagement claws 42c and 42d arranged as described above has the engagement claw 42d immediately after the start of the film auto-loading operation as the leader of the leading end of the film 48. Upper perforation
When the sprocket 42 rotates first, the film 48 engages with the engaging claw when it first engages with the opening that is the second closest to the tip of the leader among the plurality of openings 48a.
Film guide sheet 76 in film path 14 by 42d
And the film guide member 74 is moved toward the guide surface 74a.
The engagement of the engagement claw 42d with the opening is released by abutting the guide rail 94 on the guide surface 74a of the film guide member 74 and the guide surface 74a of the film guide member 74.

When the sprocket 42 continues to rotate further, the next pair of engaging claws 42c engages with the opening located at the second closest position to the tip of the leader among the plurality of openings of the upper perforation 48a. Is the same situation as shown in FIG.

FIG. 47 shows another arrangement of the engagement claws 42c and 52d which can obtain the same effect as the arrangement of the engagement claws 42c and 42d shown in FIG. Here, only one pair of the engaging claws 42c and 42d is arranged on the outer peripheral surface of the sprocket 42.

FIG. 48 shows another structure of the rear lid of the camera. The rear lid is openably and closably supported on the left end of the rear surface of the camera body chassis 10 and covers a region other than the entrance of the patrone storage chamber 12 on the rear surface in the closed position, and the right end of the main rear lid 36a. And a sub-rear lid 36b that is openably and closably supported by the unit and covers only the entrance of the patrone storage chamber 12 on the rear surface in the closed position.

A main power battery 44, a sprocket 42, and a spool 38 are housed in the main rear cover 36a. Another sprocket 112 is provided on the inner surface of the main rear cover 36a near the right end. When the sprocket 112 is loaded with the patrone 46 in the patrone storage chamber 12 by opening only the sub-back lid 36b,
A film 48 that has been drawn from the patrone 46 in advance.
Is fed along the film path 14 to the sprocket 42 located at the left end of the film path 14, and is used to feed the sprocket 42 into the spool accommodating chamber 40.

(Effect of the Invention) According to the film feeding mechanism of the camera of the present invention used in the film auto-loading type camera,
For example, even if the film take-up spool accommodating chamber is arranged behind the film path in order to deform the overall outer shape including the rear lid of the camera from the current landscape shape so as to improve the holdability of the camera, From the film path into the film take-up spool storage chamber, from the film path into the film take-up spool storage chamber so that the film is wound around the spool in the spool storage chamber with the emulsion coating surface directed radially inward of the spool. Guide the film.

[Brief description of the drawings]

FIG. 1 is a schematic horizontal sectional view of a camera according to an embodiment of the present invention; FIG. 2 is a schematic vertical sectional view of the camera of FIG. 1; FIG. 4 is a schematic horizontal sectional view showing a state in which a back cover is opened in a camera and a film is mounted at a predetermined position in a film path; FIG. 4 is arranged at a predetermined position in a film path of the camera in FIG. 1; FIG. 5 is an enlarged schematic cross-sectional view showing a state in which the upper edge of the film is prevented from being separated from the inside of the film passage by the film retainer disposed at the upper edge of the film passage; FIG. 6 is a schematic exploded perspective view showing a film winding mechanism and a film feeding mechanism related to an auto-loading device located in the vicinity of a film path in the camera; FIGS. 6 and 7 are shown in FIG. Around the upper and lower ends of the sprocket shaft FIG. 8 is a plan view schematically showing only the arrangement of the placed sprocket claws; FIG. 8 is an enlarged view of a main appearance of a film winding mechanism and a film feeding mechanism provided on a back cover in the camera of FIG. 1; FIG. 9 is an exploded perspective view schematically showing an enlarged drive system of the film winding mechanism and the film feeding mechanism of FIG. 8; FIG. FIG. 11 is a schematic plan view showing a neutral state in the drive system; FIG. 11 is a diagram schematically showing a control circuit of the drive system in FIG. 9; FIG. FIG. 13 is a horizontal cross-sectional view schematically showing a state in which the back cover is closed for FIG. 9; FIG. 9 is a view from the time when the back cover is closed for the automatic loading of the film in FIG. Schematically shows the movement in the drive system of the motor FIG. 14 is a schematic plan view showing a state in which the sprocket shaft of the film feeding mechanism is driven by the drive system of FIG. 9 in the first half of the auto-loading operation; FIG. 15, FIG. FIG. 17 is an enlarged schematic view sequentially showing a state in which the leading end of the film at a predetermined position in the film path is fed onto the spool of the film winding mechanism by the sprocket shaft of the film feeding mechanism in the first half of the auto loading operation. FIG. 18 is a schematic plan view showing a state in which the spool of the film take-up mechanism is driven by the drive system of FIG. 9 in the latter half of the auto-loading operation; FIGS. 19 and 20; The figure shows how the spool of the film take-up mechanism winds the leading end of the film from the sprocket shaft of the film feed mechanism in the latter half of the auto loading operation. FIG. 21 is a schematic horizontal sectional view showing an enlarged order; FIG. 21 shows a state in which a sprocket claw at an upper end of a sprocket shaft of a film feeding mechanism is engaged with a perforation on an upper edge side of a leading end of a film immediately after an automatic loading operation is started. FIG. 22 is a schematic horizontal sectional view showing a state in which a film guide rail provided on a camera body of the camera shown in FIG. 1 so as to protrude into a film path is useful in the state shown in FIG. 21; FIG. 23 is an enlarged and schematic longitudinal sectional view; FIG. 23 shows a conventional camera in which a film guide rail provided in a camera body so as to protrude into a film path is near a perforation on an upper edge side of the film in the state of FIG. 21; FIG. 24 is a longitudinal cross-sectional view schematically showing a state in which the film is damaged; FIG. 25 is a flowchart schematically showing the movement of the drive system in FIG. 9 in association with the winding operation; FIG. 25 is a perforation on the upper edge side of the above-mentioned leading end portion caused by the hanging of the leading end portion of the film immediately after the start of the film auto-loading operation. FIG. 26 is an enlarged schematic side view showing the shape of the sprocket claw devised to eliminate the engagement failure of the sprocket claw at the upper end of the sprocket shaft with respect to the first half of the film auto-loading operation; An enlarged schematic horizontal sectional view showing a guide member for separating a leading end of a film wound on a sprocket shaft in a high-temperature and high-humidity state from the sprocket shaft toward a spool of a film winding mechanism; FIG. 27 is a schematic longitudinal sectional view of the guide member of FIG. 26; FIG. 28 is a view of the camera body corresponding to the sprocket shaft; FIG. 29 is a schematic longitudinal sectional view of the film guide projection of FIG. 28; FIG. 29 is a schematic longitudinal sectional view of the film guide projection of FIG. Immediately after the start of the film auto-loading operation, enlargement showing a state in which the sprocket pawl at the upper end of the sprocket shaft has been successfully engaged with the perforation on the upper edge side of the leading end of the film by the action of the film guide projection shown in FIG. FIG. 31 shows that the sprocket claw at the upper end of the sprocket shaft is engaged with the perforation on the upper edge side of the leading end of the film immediately after the automatic loading operation of the film is started. FIG. 32 is a schematic plan view showing an enlarged plan view of a sprocket claw devised in FIG. 32; FIG. 33 is an enlarged perspective view schematically showing a state in which the leading edge of the film causes the lower edge of the film to open outward in the radial direction of the sprocket shaft immediately after the start of the sprocket shaft; FIG. 1 is a longitudinal sectional view schematically showing an enlarged film guide rail on a film guide member provided opposite to a sprocket shaft on a back cover of the camera shown in FIG. 1 to prevent the tendency of the film shown; FIGS. 34 and 35 show the sprocket shaft with respect to the perforation on the upper edge side of the leading end of the film immediately after the start of the film auto-loading operation by the action of the film guide rail on the film guide member of the camera back cover of FIG. FIG. 36 is a schematic horizontal sectional view showing, in an enlarged manner, a state in which the engagement of the sprocket claws at the upper end is favorably performed; FIG. 36 shows a sprocket in the camera of this embodiment; The sprocket pawls at the upper end of the sprocket shaft are arranged on the peripheral surface of the upper end of the sprocket shaft at intervals such that the sprocket pawls at the upper end of the film engage with every other opening of the perforations on the upper edge side of the film. Unlike the above, when the sprocket claws are arranged on the peripheral surface of the upper end portion of the sprocket shaft at intervals such that they engage with the multiple openings of the perforation one by one, the sprocket claw occurs immediately after the start of the film auto-loading operation. FIG. 37 is a schematic horizontal sectional view showing the film clogging phenomenon in an enlarged manner; FIG. 37 is a plan view schematically showing an enlarged arrangement of sprocket claws at the upper end portion of the sprocket shaft in the camera of this embodiment; FIG. 39 shows another example of the sprocket claw that can prevent the film jam phenomenon as shown in FIG. 36, similarly to the arrangement of the sprocket claw of FIG. FIG. 40 is an enlarged schematic horizontal cross-sectional view showing another configuration of the sprocket claw at the upper end of the sprocket shaft in the camera of this embodiment; FIG. 40 is a schematic plan view further enlarged to better show the planar shape of the sprocket claw of FIG. 40; FIG. 42 is a first view immediately after the start of the film auto-loading operation by the sprocket claw of FIG. 40; FIG. 43, FIG. 44, and FIG. 45 show a second situation in the first half of the autoloading operation of the film by the sprocket claw of FIG. 40. 46 is an enlarged schematic horizontal sectional view showing a third situation immediately after the start of the film auto-loading operation by the sprocket claw of FIG. 40; FIG. 47 is a during automatic loading work of the film 40
FIG. 48 is an enlarged plan view schematically showing a modified example of the configuration of the sprocket claw which operates in the same manner as the configuration of the sprocket claw shown in the figure; and FIG. 48 shows a modified example of the camera according to an embodiment of the present invention. It is a schematic horizontal sectional view. 10 camera body chassis, 10a escape section, 12 patrone storage room, 14 film passage, 36 rear lid, 38
... Spool, 38b ... Spool drive gear, 42 ... Sprocket, 42a, 42b ... Claw, 42c ... Sprocket drive gear train, 46 ... Patrone, 48 ... Film, 48a ...
... Upper perforation, 48b ... Lower perforation, 50 ... Lower patrone holder, 54 ... Upper patrone holder, 56 ... Film guide pair, 56a, 56b ...
Film guide, 58 …… Fill guide pair, 58a, 58b ……
Film guide, 60 ... Guide roller, 68 ... Drive mechanism, 70 ... Bidirectional motor, 72 ... Sprocket rotation measuring unit, 74 ... Film guide member, 74a ... Guide surface, 94 ... Film guide rail, 100 ... Planetary gears, 102 internal tooth members, 102a internal teeth, 104 control circuit, 110 involute curve.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-238544 (JP, A) JP-A-2-149829 (JP, A) JP-A-2-120837 (JP, A) JP-A-1- 191835 (JP, A) JP-A-62-70822 (JP, A) JP-A-3-6034 (JP, U) JP-A-56-128634 (JP, U) JP-B-47-48406 (JP, B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) G03B 17/00, 17/30

Claims (4)

(57) [Claims] An emulsion which is used in a camera of a film auto-loading type and is pulled out of a patrone storage chamber disposed at one end of the film passage to a predetermined position of a film passage facing a photographic lens in a camera body. A movable member provided so as to be able to approach / separate from the film whose surface is coated with the photographing lens; rotatably supported by the movable member, the movable member being disposed at the approach position An engagement claw that contacts the film disposed at a predetermined position in the film path of the camera body from the side on which the emulsion of the film is not applied, and engages with the perforation formed on the film. The sprocket is rotated in a state where the movable member is disposed at the approach position, and the sprocket is rotated. Sprocket driving means for feeding the film in the film passage from the patrone storage chamber arranged at one end of the film passage to the other end of the film passage along the film passage by the engagement claw of the sprocket; The movable member is disposed at the approach position, and the other end of the film path is disposed at the other end of the film path, opposite to the photographing lens, at the rear of the camera. A spool for winding up the film fed to the other end of the film path by a dovetail, and a film feeding mechanism for a camera. 2. A sprocket for engaging a perforation formed on a leading end portion of a film disposed at a predetermined position in a film passage of a camera body with a plurality of perforations of the leading end portion. The opening is provided so as to be engaged with at least one or more intervals, and in the engaging claw, in the advancing direction of the film drawn out of the patrone storage chamber within the inner periphery of the perforation opening of the distal end leader section. The engagement surface engaging with one side located on the side is defined by an involute curve formed from the base end of the engagement surface on the peripheral surface with the peripheral surface around which the film is wound in the sprocket as a base circle. And a line having a smaller curvature than a portion corresponding to a height from the base end of the engagement surface to the height of the engagement claw. In the sprocket, when the movable member is located at the approach position, a portion of the camera body opposite to the engaging claw engaged with the perforation of the distal leader portion has a perforation of the distal leader portion of the film. 2. An escape portion for accommodating the engaging claw projecting from an opening to the emulsion coating side of the film and preventing contact with a protruding end of the engaging claw is provided. The film feeding mechanism of the camera according to the above. 3. A movable member which is used in a camera of a film auto-loading system and which is provided so as to be able to approach and separate from a film disposed at a predetermined position in a film path of a camera body; It is rotatably supported, and contacts the film at a predetermined position in the film path of the camera body from the side where the emulsion of the film is not applied by the arrangement of the movable member to the approach position, and prevents the film from being perforated. A sprocket having an engaging claw to be engaged; a sprocket for rotating and driving the sprocket in a state where the movable member is located at the approach position, and feeding the film in the film path along the film path by the engaging claw of the sprocket. Driving means; and a predetermined position of the film path of the camera body in the sprocket. The engaging claw that engages with the perforation formed in the leading end portion of the film disposed in the plurality of adjacent perforations is disposed at least one or more intervals in the plurality of openings of the perforation. One of the plurality of openings of the perforation is provided to engage with a group of one of the plurality of openings; The engaging surface that engages with one side of the film path in the film path in the direction of travel of the film in the circumference is formed on the peripheral surface of the sprocket as a base circle on which the film is wound. In an involute curve formed from the base end of the engagement surface, the curvature is smaller than that of a portion corresponding to the height of the engagement claw from the base end of the engagement surface. A portion of the camera body which is constituted by a line, and which faces the engaging claw which is engaged with the perforation opening of the leading end portion of the film in the sprocket when the movable member is disposed at the approach position; A receiving portion for receiving the engaging claw protruding from the perforation opening of the leading end portion of the film toward the emulsion coating surface side of the film and preventing contact with the protruding end of the engaging claw is provided; A film feeding mechanism for a camera. 4. The sprocket according to claim 1, further comprising a film disposed at a predetermined position in a film path of the camera body and a perforation formed at a leading end portion of the film opposite to a side in a width direction of the film. An engaging claw that engages with one of the perforations is provided so as to continuously engage with the plurality of openings of the other perforation, and the sprocket is configured to feed a film by the sprocket from rotation of the sprocket. A film feed amount measuring means for measuring the amount and generating a film feed amount measurement signal, wherein the film feed amount measuring means and the sprocket driving means are
When detecting that the film feed amount by the sprocket driving means has reached a predetermined amount based on the film feeding amount measurement signal from the film feeding amount measuring means, the sprocket is configured to stop the film feeding by the sprocket driving means. 4. The film feeding mechanism for a camera according to claim 1, wherein the film feeding mechanism is connected to sprocket drive control means for controlling the drive means.