JPH0430139A - Film feeding mechanism for camera - Google Patents

Abstract

PURPOSE:To feed a film even when a film winding spool housing chamber is arranged more backward than a film path by selectively driving and rotating a sprocket in a state where a movable member is arranged at a close position at the time of starting an automatic loading operation. CONSTITUTION:The back surface of a camera main body chassis 10 is covered by a back cover 36 which is turnably supported, and a spool housing chamber 40 in which a spool 38 is rotatably housed is formed at the left end of the back cover 36. A cartridge housing chamber 12 is arranged at one end of the film path 14 and in front of the path 14. Then, the sprocket 42 and the spool housing chamber 40 are arranged at the other end of the path 14 and at the rear of the path 14. The film 48 drawn out from a cartridge 46 housed in the chamber 12 is wound on the spool 38 in a state where an emulsifier applied surface may face inside in the radial direction of the spool 38.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a film feeding mechanism for a camera that feeds a film placed at a predetermined position in a film path of a camera body along the film path.

(Prior Art) In the film feeding mechanism of a conventional camera, the sprocket and the sprocket driving means are arranged in such a way that the cartridge storage chamber and the film winding spool storage chamber are arranged at both ends of the camera body chassis. It is located in the chassis near the film winding spool housing chamber.

(Problem to be solved by the invention) If the conventional camera configured as described above is relatively heavy, the camera body chassis is horizontally long and the balance is not very good. Even if you hold it upright, you have to hold it firmly with both hands, and the so-called holding properties are not good. In order to improve the holdability, it is necessary to reduce the horizontal dimension of the overall external shape of the current camera, including the rear cover, and to reduce the vertical dimension (along the optical axis of the photographic lens). It is necessary to increase the film winding spool storage chamber from the current position, and in order to do so, the film winding spool storage chamber must be placed behind the film path, and the film will not be coated with emulsifier on the spool in the film winding spool storage chamber located in this way. The film must be guided from the film path into the film take-up spool receiving chamber so that it is wound with the surface radially inward of the spool. However, with the conventional sprocket disposed on the camera body chassis, when the film winding spool housing chamber is arranged behind the film passage, the film cannot be guided from the film passage into the film winding spool housing chamber as described above. do not have.

This invention was made based on the above circumstances, and the purpose of this invention is to
For example, even if the film winding spool storage chamber is placed behind the film path in order to change the overall external shape of the camera, including the rear cover, from its current oblong shape to improve the holdability of the camera, the film from the film path into the film take-up spool chamber so that the film is wound onto the spool in the spool chamber with the emulsifier coated surface facing radially inward of the spool; It is an object of the present invention to provide a film feeding mechanism for a camera capable of guiding film.

(Means for Solving the Problems) In order to achieve the above-mentioned objects, a film feeding mechanism of a camera according to the present invention used in a film autoloading type camera is: arranged at a predetermined position in the film path of the camera body. a movable member that is movable toward and away from the loaded film and is moved from a separate position to an approach position at the start of a film autoloading operation; a sprocket having an engaging pawl that contacts the film at a predetermined position in the film path of the camera body from the side of the film not coated with an emulsifier and engages with the perforations of the film; a movable member; The present invention is characterized by comprising: a sprocket driving means for selectively driving the sprocket to rotate in a state where the sprocket is disposed at an approach position to feed the film in the film path along the film path by the sprocket.

Another camera film feeding mechanism according to the present invention used in film autoloading cameras to achieve the above-mentioned objects is: A movable member that is movable toward and away from the camera body and is moved from a remote position to an approach position at the start of a film autoloading operation; A movable member is rotatably supported by the movable member, and when the movable member is placed in the approach position, the movable member moves into the film path of the camera body. a sprocket having an engaging pawl that contacts the film at a predetermined position from the side of the film where no emulsifier is applied and engages with the perforations of the film; the movable member is disposed at an approaching position; and a sprocket driving means for selectively rotating the sprocket to feed the film in the film path along the film path by the sprocket. The engagement pawl of the sprocket that engages with the perforation formed only in the leader at the tip is located between two mutually adjacent openings that are arranged at least one interval among the plurality of openings in the perforation. The engaging surface of the engaging pawl that engages with one opening located on the leading end side of the film in one group among the plurality of openings of the perforation has a diameter of the sprocket. It is constituted by a line having a smaller curvature than the involute curve serving as the base circle, and the engaging surface of the engaging claw that engages with the remaining one opening in the one group is constituted by the involute curve. The part of the camera body that faces the sprocket when the movable member is placed in the approach position accommodates and engages an engaging claw that protrudes from the perforation opening of the leader at the leading end of the film toward the film emulsifier coated surface. It is characterized by being provided with a relief part that prevents contact with the protruding end of the claw.

(Function) The film feeding mechanism of the former camera is provided so that it can approach and move away from the film placed at a predetermined position in the film path of the camera body, and is moved from the separating position to the approaching position at the start of the film autoloading operation. The sprocket is rotatably supported by the movable member. By arranging the movable member to a close position, the sprocket contacts the film at a predetermined position in the film path of the camera body from the side of the film that is not coated with emulsifier, and engages the engaging claw against the perforation of the film. Match. The sprocket feeds the film in the film path along the film path by being selectively rotationally driven by the sprocket driving means with the movable member disposed at the approach position.

The film feeding mechanism of the latter camera is also movable so that it can move toward and away from the film placed at a predetermined position in the film path of the camera body, and is movable so that it can move toward and away from the film placed at a predetermined position in the film path of the camera body. A sprocket is rotatably supported by this movable member. By arranging the movable member to the close position, the sprocket contacts the film at a predetermined position t in the film path of the camera body from the side of the film that is not coated with emulsifier, and engages the perforation of the film with an engaging claw. engage. The sprocket feeds the film in the film path along the film path by selectively being rotationally driven by the sprocket driving means with the movable member disposed at the approach position.

In the film feeding mechanism of the latter camera, an engaging pawl of a sprocket that engages with a perforation formed only in the leader at the leading end of the film disposed at a predetermined position in the film path of the camera body. It is provided to engage with a group of two adjacent openings arranged at least one interval among the plurality of openings of the perforation. The engagement surface of the engagement claw that engages with one opening located on the tip side of the film in one group among the plurality of openings in the perforation has a curvature smaller than the involute curve whose base circle is the diameter of the sprocket. The engagement surface of the engagement claw that engages with the remaining opening in the one group is defined by the involute curve. The engaging pawl that protrudes from the perforation opening of the leader at the tip of the film toward the film emulsifier coated side is a relief part provided in the part of the camera body that faces the sprocket when the movable member is placed in the approach position. Since the protruding end of the engaging claw is housed inside, the protruding end of the engaging claw is prevented from coming into contact with the above-mentioned portion of the camera body.

(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 cartridge storage chamber 12 is formed on the right side of the rear surface of the camera body chassis 10, and a cartridge storage chamber 12 is formed along the rear surface. A film passage 14 is defined from the cartridge storage chamber 12 to the left side of the rear surface.

A photographing opening 16 is formed in the front surface of the camera body chassis 1o and extends to a film passage 14 on the rear surface, and the photographing opening 16 is covered by a focal brain shutter unit 18 disposed on the front surface.

Further, on the front of the camera body chassis 10, there is a mirror box 20 which is arranged in front of the focal brain shutter unit 18 and holds the main mirror 19, and a lens frame which is arranged further in front of the mirror box 2o and supports the photographing lens group 22. 24 is supported.

A mirror box 2 is provided on the top surface of the camera body chassis 10.
A plurality of specially shaped mirrors 26g, 26b, and 26C forming a finder optical system are disposed above 0.

The camera body exterior housing 28, which covers the various members mentioned above supported on the front and upper surfaces of the camera body chassis 10, bulges forward of the cartridge storage chamber 12 to form a grip portion 28a. A strobe main capacitor 30 is housed in a gap created between the internal space covered by the grip part 28a and the cartridge storage chamber 12. Supported to open and close freely.

The strobe reflector 32a of the strobe 32
When the strobe 3 is placed in the closed position shown by the solid line in FIG.
2 is placed in the open position shown by the two-dot chain line in FIG. 2, it is removed from the recess in the upper surface and directed in front of the camera.

The camera body exterior housing 28 also supports an eyepiece lens 34 at a position opposite a mirror 26c located at the final position of the finder optical system.

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

A spool storage chamber 40 in which a spool 38 is rotatably stored is formed at the left end of the rear lid 36, and the spool storage chamber 40 opens 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 storage chamber 40, and the sprocket 42 and the spool 38 are selected by a driving means not shown in FIGS. 1 and 2 disposed in the rear cover 36. driven by

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

In the camera of the above-described embodiment, the cartridge storage chamber 12 is located in front of the film path 14 at one end of the film path 14, and the subroquet 42 and the spool storage chamber 40 are located at the other end of the film path 14 in front of the film path 14. 1
It is located behind 4. The film 48 pulled out from the cartridge 46 stored in the cartridge storage chamber 12 is automatically guided through the film passage 14 by the sprocket 42.
The emulsifier is extended to the spool 38 by being wound around the circumferential surface of the sprocket 42, and wound onto the spool 38 with the emulsifier-coated surface facing inward in the radial direction of the spool 38.

When a shirt button (not shown) provided on the upper surface of the grip portion 28a of the camera body exterior housing 28 is pressed, the main mirror 19 in the mirror box 20 is moved to the first position.
By rotating upward from the position shown in the figure and then opening the focal brain shutter unit 18, the image captured by the photographic lens group 22 that was being viewed through the eyepiece lens 34 immediately before the shutter button was pressed is Film passage 14
One frame area of the film 48 facing the photographing aperture 16 is photographed.

The main mirror 19 and the focal brain shutter unit 18 are activated after the exposure time has elapsed based on the exposure signal from the exposure meter placed at an appropriate position on the screen mat 20a of the upper opening of the mirror box 20 or the camera body exterior housing 28. It is returned to the lower position shown in Figure 1 and closed again.

When one frame of the film 48 has been photographed, the spool 38 is driven to rotate, and the photographed area of the film guided from the film path 14 toward the spool 38 by the freely rotating sprocket 42 is filled with emulsifier for one frame as described above. It is wound up with the applied surface facing inward in the radial direction of the spool 38.

The camera of the above-described embodiment is an auto-loading film camera. When loading a new film 48 in the camera of the above-described embodiment, the rear cover 36 is moved to the open position as shown in FIG. Rotated.

After correctly storing a cartridge 46 of a new film 48 in the cartridge storage chamber 12, the film 48 pulled out from the cartridge 46 is extended along the film path 14 to the left end of the rear surface. Next, the rear lid 36 is rotated to the closed position and held in the closed position by the aforementioned rear lid locking member, which is not shown in FIGS. 1 and 2, and is provided at the right end of the camera body chassis 10. .

When the rear lid 36 is rotated to the closed position, the sprocket 42 engages an engaging pawl 42a formed on its circumferential surface with a 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 selectively drives the sprocket 42 by the above-mentioned operation of holding the rear lid locking member in the closed position. This allows the film 48 in the film path 14 to
The tip of the spool storage chamber 40 is connected to the sprocket 42.
It is sent toward the spool 38 inside.

After sufficient time has elapsed for the leading edge of film 48 to reach spool 38, the aforementioned driving means (not shown) then selectively drives spool 38 instead of sprocket 42, and sprocket 42 is free to rotate. Be free. As a result, the film 4 that had reached the spool 38
The distal end of the spool 38 is wound onto the circumferential surface of the spool 38 by engaging the perforation of the distal end with an engaging claw 38a formed on the circumferential surface of the spool 38.

After a sufficient period of time has elapsed for the leading edge of the film 48 to be wound onto the circumferential surface of the spool 38 without unwinding, the drive means (not shown) selectively drives the spool 38. Stop. The film autoloading operation is performed by such a procedure.

FIG. 5 shows an enlarged view of the rear surface of the camera body chassis 10 that defines the film passage 14 and the main portion of the rear lid 36 facing thereto.

As shown in FIG. 5, a lower cartridge holder 50 made of high friction material such as rubber or felt is attached to the lower surface of the cartridge storage chamber 12, and the upper end of the cartridge storage chamber 12 is biased downward by a spring 52. An upper cartridge holder 54 is arranged. The upper cartridge holder 54 and the lower cartridge holder 50 hold the cartridge 46, which is mounted in a correct posture at a predetermined position in the cartridge storage chamber 12, at the predetermined position and in a compressed posture.

A pair of upper and lower film guides 56 and 58 are formed on the rear surface of the camera body chassis 10 and project into the film path 14, extending along the upper and lower edges of the photographing opening 16. There is.

In this embodiment, the lower film guide 56b in the upper film guide pair 56 and the lower film guide pair 5
8 two film guides 58a.

58b, but the upper film guide 56a in the upper film guide pair 56 is longer than the film path 1.
4 is shorter than the lower film guide 56b.

A pair of upper and lower film guides 56 and 58 are provided on the left end side of the film passage 14 on the rear surface of the camera body chassis 10.
A guide roller 60 extending in the vertical direction is disposed near the left side of the guide roller 60, and the guide roller 60 is rotatably supported at the upper and lower ends by a guide roller presser 62 on the rear surface.

An upper film presser 64 is formed on the rear surface of the camera body chassis 10 above the upper film guide pair 56 and near the left edge of the photographing opening 16 so as to protrude into the film passage 14 and define the upper end of the film passage 14. The projecting end of the upper film presser 64 is bent downward to form a film lifting prevention protrusion 64a.

As shown in FIG. By contacting the upper film retainer 6, the upward tilt is regulated, and the upper film retainer 6
4 prevents the camera body chassis 10 from rising rearward from the film passage 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 plate spring 66a.
6, when the rear lid 36 is placed in the above-mentioned closed position, the film 48 in the film passage 14 is moved by the elastic force of the pressure plate pressing plate spring 66a to the upper and lower film guide pair 56 and 5.
Press on 8. As a result, the film 48 also
It is also pressed onto the guide roller 60 on the outside of the pressure plate 66.

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

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

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

As shown in FIG. 6, three engaging claws 42a at the upper end of the circumferential surface of the sprocket 42 are arranged at equal intervals in the circumferential direction, and three engaging claws 42b at the lower end of the circumferential surface of the sprocket 42 are arranged in the circumferential direction. Six pieces are arranged at equal intervals. The three engaging claws 42a at the upper end engage every other engagement hole in the upper perforation of the film 48, and the six engaging claws 42b at the lower end engage with the plurality of engaging holes in the upper perforation of the film 48. It continuously engages with a plurality of engagement holes in the perforation.

Note that the planar shape of the engaging claw 42a at the upper end is different from the planar shape of the engaging claw 42b at the lower end, which will be explained in detail later.

As shown in FIG. 5, a sprocket rotation measuring device unit 72 using a photo interrupter is connected to the upper part 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. Guide surface 7 of film guide member 74 facing sprocket 42
4a has a curved surface that follows the curve of the opposing sprocket 42.

A guide surface 74a of the film guide member 74 is provided with a guide surface 74a of the camera body chassis 10 in order to close a gap created between the left end of the rear surface of the camera body chassis 10 and the left end of the rear cover 36 rotatably connected thereto. A film guide sheet insertion amount lower 8 is formed at the left end of the rear surface into which the free end of the film guide sheet 76 fixed together with the guide roller presser 62 is inserted.

FIG. 5 also shows the aforementioned rear lid locking member 80 for holding the rear lid 36 in the closed position. The rear cover locking member 80 is attached to the right end surface of the camera body chassis 10 so as to be vertically movable, and is biased upward by a biasing means 82 . Below the rear lid locking member 80 is a common drive mechanism 68 for the spool 38 and sprocket 42.
A rear cover switch SW1 is arranged which is connected to a control means which will be described later.

When the rear lid 36 moves from the open position to the closed position, the rear lid locking member 80 is pressed by an engaging pawl 84 formed at the right end of the rear lid 36 and once lowered, the rear lid locks. Press the switch SW1 to turn on the rear cover switch SW1.

rear! When the i36 reaches the closed position, the engaging claw 84 of the rear cover 36
The downward pressure on the rear lid locking member 80 is released, and the rear lid locking member 80 is moved upward by the urging force of the urging means 82 until it engages with the engaging claw 84 of the rear lid 36.

FIG. 8 shows an enlarged view of the left end of the rear lid 36 and the left end of the rear surface of the camera body chassis 10 when the rear lid 36 is placed in the open position for film autoloading work. In the spool storage chamber 40 of the rear lid 36, a first film pressing lever 86 extends from the entrance of the spool storage chamber 40 to a position far from the entrance on the circumferential surface of the spool 38, and on the inner surface of the spool storage chamber 4o. Subu
A second film pressing lever 88 is shown extending from a position far from the entrance of the film storage chamber 40 toward a position close to the entrance on the circumferential surface of the spool 38.

The first and second film holding levers 86 and 88 have ends on the inner surface side of the spool storage chamber 40 rotatably supported on the inner surface, and film holding rollers 90 on the ends on the spool side. is rotatably supported.

The first and second film pressing levers 86 and 88 are further urged to press the film pressing roller 90 onto the circumferential surface of the spool 38 by a biasing member 92 disposed between them and the inner surface of the spool storage chamber 40. Forced.

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

FIG. 9 schematically shows the structure of the common drive mechanism 68 for the spool 38 and sprocket 42 in an exploded state, and FIG. 10 shows a schematic plan view of said structure in the mutually assembled state. It is.

As shown in FIGS. 9 and 10, a drive gear 70a fixed to the output shaft of a bidirectional motor 70 disposed in the internal space of the spool 38 meshes with an input gear 96a of a reduction gear train 96. .

The outlet gear 96b of the reduction gear train 96 has one end rotatably supported by the play arm 98, which has one end rotatably supported by the outlet gear 96b. The star gears 100 are in mesh. The planetary gear 100 also includes internal teeth 10 of an arc-shaped internal tooth member 102 fixed to the chassis 68a of the drive mechanism 68.
It also meshes with 2a.

A spool drive gear 38a formed at the lower end of the spool 38 and a sprocket drive gear train 42C meshed with the lower end of the sprocket 42 are arranged on both sides of the internal gear member 102 on the revolving orbit of the i1M gear 100. There is.

In the state before the film autoloading operation is started, the planetary gear 100 is meshed with the internal teeth 102a of the internal tooth member 102, as shown in FIGS. 9 and 1810.

In FIG. 11, a ninth
A control circuit 104 is schematically shown connected to the bidirectional motor 70 of the drive mechanism 68 as shown.

In the control circuit 104, one terminal of the bidirectional motor 70 is connected to the emitter of the transistor T1 and the emitter of the transistor T2.
The other terminal is connected to the collector of transistor T3.
and the collector of 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 supply battery 44, and the bases of the transistor T1 and transistor T2 are connected to the C1 and C2 terminals of the CPU, respectively. The collector of the transistor T3 and the emitter of the transistor T4 are connected to the positive and negative poles of the power supply battery 44, and the bases of the transistors T3 and T4 are connected to the C3 and C4 terminals of the CPU, respectively.

A resistor R1 connected to the input terminal of the light emitting element of the sprocket rotation measurement unit 72 and a collector of the phototransistor of the sprocket rotation measurement unit 72 are further connected to the positive terminal of the power supply battery 44.
The output terminal of the light emitting element is further connected to the negative pole of the light emitting element. The emitter of the upper phototransistor is the CPU
It is connected to the 05 terminal of.

The CPU further includes a rear lid switch SWI that is interlocked with the rear lid locking member 80 and a shirt release switch SW2 that is interlocked with the aforementioned shirt button (not shown) at C6 and C.
Connected at 7 terminals.

When the drive gear 70a of the bidirectional motor 70 is rotated in the forward direction (counterclockwise in FIG. 10) in the control circuit 104 configured as described above, the CP
C1 and C2 terminals of U are brought low, and C3 and C4
The terminal is pulled high. Conversely, when rotating the drive gear 70a of the bidirectional motor 70 in the opposite direction (clockwise in FIG. 10), the C1 and C2 terminals of the CPU are set high, and the C3 and C4 terminals are set low. be done.

Further, in order to stop the rotation of the drive gear 70a of the bidirectional motor 70, the C1 and C3 terminals are set high, and the C2
and the C4 terminal is pulled low.

In FIG. 12, after the rear cover 36 is placed in the open position and a new cartridge 46 is properly installed in the cartridge storage chamber 12 of the camera body chassis 10, the front end of the film 48 pulled out from the cartridge 46 is shown in the camera. Main body chassis 1
When the rear cover 36 is rotated to the closed position for film autoloading, the front end of the film 48 is moved from the open position. The film 48 separates from the film path 14 due to the force applied to the front end of the film 48 due to contact with the guide surface 74a of the film guide member 74 of the rear lid 36 or the film guide sheet during rotation to the closed position. The possibility that the cartridge 46 may be displaced from its predetermined position in the nomatrone storage chamber 12 is indicated by the two-dot chain line.

However, in the camera of the embodiment of the present application, the above possibility is limited to the film path 1 on the rear side of the camera body chassis 10.
The upper film holder 64 on the upper edge of 4 and the lower and upper cartridge holders 50 and 54 in the cartridge storage chamber 12 (
(see Fig. 5).

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 autoloading operation.

That is, the rear lid 36 is moved to the closed position from the state shown by the solid line in FIG. By being held, the rear lid switch SWI interlocked with the rear lid closed position locking member 80 operates on and off, thereby causing the CPU of the control circuit 104 to rotate the drive gear 70a of the bidirectional motor 70 in the normal direction (Fig. 10). (rotate counterclockwise). As a result, the sun gear 9 of the reduction gear train 96a
6b also rotates in the normal direction, and as shown in FIG. 14, the planetary gear 10
0 is rotated forward around the sun gear 96b. This planetary gear 100 separates from the internal teeth 102a of the internal tooth member 102 and meshes with the sprocket drive gear train 42c of the sprocket 42, thereby transmitting the rotational force from the drive gear 70a of the bidirectional motor 70 to the sprocket 42.

When the rear lid 36 is placed in the closed position, the peripheral surface of the sprocket 42 moves to the front of the film 48 in the film path 14, so that the upper end of the sprocket 42 is located at the left end in the film path 14. film 48
As shown in FIG. 15, the leader located in the upper half of the front end of the film 48 presses the emulsifier-coated surface of the front end of the film 48 onto the guide roller 60 on the rear surface of the camera body chassis 10.

At the left end of the rear surface of the camera body chassis 10, a 15th hole is attached to the left end of the rear surface of the camera body chassis 10 in order to avoid contact between the engaging claw 42a at the upper end of the sprocket 42 that has moved forward and the engaging claw 42b at the lower end (see FIG. 5). As shown in the figure, an escape recess 10a recessed forward is formed.

The sprocket 42 pressed by the leader at the front end of the film 48 is rotated counterclockwise as shown by the arrow in FIG. 14 by the rotational force from the drive gear 70g of the bidirectional motor 70, as shown in FIG. 15. , an engaging pawl 42B at the upper end of the sprocket 42 engages one of a plurality of openings in an upper perforation 48a formed along the upper edge of the leader, and the film 48 is moved along the film path 14 into the camera body chassis. The film guide sheet 76 between the left end of the rear surface of 10 and the left end of the rear 136 and the guide surface 74 of the film guide member 74 of the rear lid 36
Move toward a.

The front end of the leader of the film 48 moved by the sprocket 42 comes into contact with the film guide sheet 76 and the guide surface 74a of the film guide member 74, so that the film 48 moves in the circumferential direction of the sprocket 42, as shown in FIG. As shown in FIG. 17, the film is eventually pressed onto the circumferential surface of the spool 38 by the roller 90 of the first film pressing lever 86.

The rotation amount of the sprocket 42 (that is, the sprocket 42
CPU measuring the distance traveled by the film 48)
The number of output pulses is such that the front end of the film 48 is moved from the left end of the film path 14 to the spool 3 as shown in FIG.
When the number of pulses N1 is equal to or larger than the predetermined number N1 required for sending the pulses onto the circumferential surface of the motor 8, the timer A is activated and the rotation direction of the drive gear 70a of the bidirectional motor 70 is reversed. As a result, the sun gear 96b of the reduction gear train 96a is also reversed, and as shown in FIG.
00 around sun gear 96b. This planetary gear 100 separates from the sprocket drive gear train 42c of the sprocket 42, releases the drive of the sprocket 42 by the bidirectional motor 70 of the drive mechanism 68, and disengages the sprocket 42.
The spool drive gear of the spool 38 is made freely rotatable, meshes with the internal teeth 102a of the internal tooth member 102, moves on the internal teeth 102a, and detaches from the internal teeth 102a as shown in FIG. 38a to transmit the rotational force from the drive gear 70g of the bidirectional motor 70 to the spool 38.

As shown in FIG.
The front end of the upper film 48 is engaged with one of the plurality of openings in the upper perforation 48a of the leader, and the leader is wound with the emulsifier coated surface facing inward in the radial direction of the spool 38.

The rotation amount of the sprocket 42 (that is, the sprocket 42
CPU measuring the distance traveled by the film 48)
When the number of output pulses is equal to or larger than the predetermined number of pulses N2 required to reliably wind the front end of the film 48 onto the spool 38 by 11 times, the rotation of the drive gear 70a of the bidirectional motor 70 is stopped. At the same time, timer A is reset.

Note that if the number of output pulses from the sprocket rotation measurement unit 72 does not reach the predetermined pulse number N2, and the time counted by the timer A is the predetermined time required for the spool 38 that rotates for film winding to rotate half a revolution. T
If it becomes equal to or greater than I,
The CPU determines that the film autoloading operation has failed, and stops the rotation of the drive gear 70a of the bidirectional motor 70 and resets the timer A. 2) or on a data display panel (not shown) provided on the outer surface of the rear lid 33. In this case, it is necessary to open the rear cover 33 and operate the cartridge 46 and film 48 in the cartridge storage chamber 12 and film passage 14 so that they are correctly loaded.

FIG. 20 shows a state in which the photographed area of the film 48 is wound up in layers on the spool 38 as a result of multiple photographs being taken after the film auto-loading operation is completed.

Here, the photographed area of the film 48 wound in layers on the spool 38 is located in the cartridge storage chamber 1.
2, it is pressed onto the spool 38 by the biasing force of the biasing member 92 of the first and second film press levers 86, 88 via the film press rollers 9o of the first and second film press levers 86, 88. This prevents any slack from occurring on the spool 38.

FIGS. 21 and 22 show that, during film autoloading, the left end of the upper and lower pair of film guides 56 and 58 on the rear surface of the camera body chassis 10 is the shortest. The advantage provided by the film guide 56a (see FIG. 5) is shown.

Among the three engaging claws 42b at the upper end of the sprocket 42 that has started rotating immediately after the start of the film autoloading operation, the leader at the front end of the film 48 located at the left end in the film path 14 is contacted first. 1, I@
As shown in FIG.
The bridge portion between them is pushed out into the relief portion 10a at the left end of the rear surface of the camera body chassis 10. At this time, since the left end side of the film guide 56a located at the uppermost position is short, the upper edge of the above-mentioned leader gently forms the relief part 10 as shown in FIG.
It is pushed out into a. For the second reason, when the flexibility of the film 48 is reduced at low temperatures, the upper edge of the leader at the front end of the film 48 may not be pushed out as described above by the engaging claw 42b that is not engaged. Even if this occurs, damage such as bending or cutting will not occur to the upper perforation 48 of the leader, to the bridge portion between the plurality of openings 8, and to the film 48. Such damage is likely to cause film jams and greater damage to film 48 during film autoloading operations.

If the left end of the uppermost film guide 56M is as long as the other film guides 56b, 58a, and 58b, the unengaged engaging claw 42b will be attached to the leader as shown in Figure $21. Connect the bridge between the multiple openings 8 of the upper perforation 48 to the camera body chassis 1.
As shown in FIG. 23, the upper edge of the leader is pushed out into the relief part IC1a at the left end of the rear surface of 0, so that the film forming a pair with the left end of the uppermost film guide 56m and the film guide 56a. It is forced to enter the narrow gap between it and the left end of the guide 56b.

Under conditions where the flexibility of the film 48 is reduced at low temperatures, the upper edge of the leader that is forced to fit into such a narrow gap is susceptible to damage such as bending or cutting.

FIG. 24 is a flowchart showing how the drive mechanism 68 is controlled by the control circuit 104 while photographing is carried out one frame at a time until the end of the film after film autoloading is completed.

That is, when the aforementioned shirt release button (not shown) is pressed in order to photograph one frame of the film 48 after film autoloading is completed, the shirt release switch SW2 (11th
(see figure) is turned on, and the focal brain shutter unit 18 (see figure 1) is opened for a predetermined period of time to complete the photographing of one frame. After this, the timer B starts measuring the passage of time, and the drive gear 70g of the bidirectional motor 7o of the common drive means 68 (see FIG. 18) for the sprocket 42 and the spool 38 is reversed (first
(clockwise direction in Figure 8). As a result, the planetary gear 100 is biased in the direction toward the spool drive gear 38a of the spool 38, but when film autoloading is completed, the planetary gear 100 of the drive means 68 is biased as described above.
As shown in FIG. 18, the rotational force of the drive gear 70m of the bidirectional motor 7o is immediately transmitted to the spool 38, and the spool 38 starts photographing the film 48. Winding up of the completed area will begin. The CPU calculates the amount of movement of the film 48 in the film path 14 during the winding operation of the filmed area of the film 48 described above, based on the number of pulses emitted from the sprocket rotation measurement unit 72 provided on the sprocket 42, in total 1111 times.
1, and when the above-mentioned number of pulses becomes equal to or greater than a predetermined value N3 corresponding to the advance of one frame of the film 48, the reversal of the drive gear 70a of the bidirectional motor 70 is stopped, and the timer B is Reset. This completes the winding operation for one frame of the rolling film 48 on the spool 381. Now, during the winding operation for one frame of the film 48, the number of pulses emitted from the sprocket rotation measuring unit 72 does not reach the predetermined value N3,
Furthermore, when the time measured by timer B is equal to or greater than the predetermined maximum time required to wind up one frame of film 48, it is determined that the film has ended.
The reverse rotation of the drive gear 70a of the bidirectional motor 70 is stopped. At the same time, the timer 0 starts measuring the passage of time, and the drive gear 70a of the bidirectional motor 70 is rotated forward (in FIG. 18, counterclockwise). The time measured by the timer C is such that the planetary gear 100, which revolves in the counterclockwise direction in FIG.
When the predetermined time T3 required for sufficient engagement with the internal teeth 102a of 02 as shown in FIG. Reset both.

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

The planetary gear 100 is attached to the first internal tooth 102a of the internal tooth member 102.
By re-engaging as shown in Figure 0, both the sprocket 42 and the spool 38 can freely rotate.
By rotating the film winding shaft in the film winding direction manually or by using a film winding remoter (not shown) disposed in the camera body chassis 10, the film 48 that has been wound in layers on the spool 38 is rotated. The photographed area can be rewound onto the film winding shaft of the cartridge 46.

FIG. 125 shows a cartridge extending from the cartridge 46 in the cartridge storage chamber 12 at the right end of the rear face of the camera body chassis 10 to the left end of the rear face along the film path 14 on the rear face in preparation for film autoloading work. Even if the leader located above the front end of the unloaded film 48 is somewhat inclined with respect to the rotation center axis of the sprocket 42 as shown by the two-dot chain line in FIG. 25, the automatic film loading operation cannot be started. In order to ensure that the engaging claw 42m at the upper end of the sprocket 42 on the rear cover 33, which has been rotated from the open position to the closed position, is engaged with the plurality of openings in the upper perforation 48a formed in the leader. The shape of the engaging claw 42a that has been devised is shown enlarged. That is, the upper end surface of this devised engaging claw 42a has an inclined surface whose tip end side is machined obliquely.

FIGS. 26 and 27 show that when the film 48 has become soft under high temperature and humidity conditions, the leader at the front end of the film 48 wraps around the sprocket 42 during the film autoloading operation, causing the film 48 to become soft.
In order to effectively prevent the film from separating from the film, a film separation protrusion 108 is shown 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. ing. Here, FIG. 27 is a schematic longitudinal cross-sectional view taken along line A--A in FIG. 26. The film separating protrusion 108 is inclined from the sprocket 42 toward the circumferential surface of the spool 38, and the front end of the leader of the front end of the film 48 that has been wrapped around the sprocket 42 and is not separated from the sprocket 42 during the film autoloading operation is the 26th film separating protrusion 108.
By making contact as shown in the figure, the sprocket 42
By being separated from above and then sliding, the moving direction is forcibly guided toward the circumferential surface of the spool 38.

28 and 29 schematically show a film guide protrusion 108 further formed at the left end of the relief portion 10g formed at the left end of the rear surface of the camera body chassis 10 facing the sprocket 42. is shown. Furthermore, the second
FIG. 9 is a schematic longitudinal sectional view taken along line B-H in FIG. 28.

The film guide protrusion 108 formed at the left end of the relief portion 10g engages the plurality of engaging pawls 4 at the upper end of the sprocket 42 immediately after the above-mentioned film autoloading starts.
2a that first approaches the leader at the front end of the film 48 is not immediately engaged by one of the plurality of openings in the upper perforation 48a of said leader; Claw 42a
As a result, the leader has a relief part 10a as shown in FIG.
Not only is it possible to prevent damage by bending when pushed in, but also because the engaging claw 42a eventually engages one of the plurality of openings in the upper perforation 488 of the leader. The front end of the leader above is the third
As shown in FIG. 0, the rotation of the sprocket 42 causes the guide surface 74J of the film guide member 74! When the film guide member 74 is moved toward the guide surface 74a of the film guide member 74, the front end is aligned with the curve of the sprocket 42.
It forces it to slide smoothly onto the top.

FIG. 31 shows that the film 48 is initially engaged with a plurality of openings in the upper perforation 48m of the leader at the front end of the film 48 immediately after starting film autoloading, and the film 4 is transferred from the film passage 14 into the spool storage chamber 40.
Sprocket 42 used to initiate movement of 8
The characteristic planar shape of the plurality of engaging claws 42a at the upper end is shown enlarged.

As can be seen from FIG. 31, the tooth surface z1 of each of the plurality of engaging pawls 42a located on the front side in the rotation direction of the sprocket 42 (counterclockwise in FIG. 31) has the diameter of the sprocket 42 as the base circle. Impolineated curve 1
The tooth surface z2 of each of the plurality of engaging pawls 42a located on the rear side in the rotational direction of the sprocket 42 is formed by a line with a curvature larger than 10, and the tooth surface z2 of each of the plurality of engaging pawls 42a located on the rear side in the rotation direction of the sprocket 42 has the above-mentioned tooth surface as well as the tooth surface of the tooth of a conventional gear. It is composed of an involute curve. For this reason, when the tooth surface z1 located on the front side in the rotational direction is constituted by an involute curve 110, the engaging claw 42M engaged with the opening of the upper perforation 48M of the leader at the front end of the film 48 is connected to the film passage 14. The elasticity of the front end of the film 48 can effectively prevent the tendency for the engagement claw 42a to disengage from the opening of the upper perforation 48a as it moves away from the opening of the upper perforation 48a, as shown by the two-dot chain line in FIG. .

FIG. 32 shows the sprocket 42 in a state where the plurality of engaging claws 42a at the upper end of the sprocket 42 are only engaged with the plurality of openings in the upper perforation 48m of the leader at the front end of the film 48 immediately after the start of film autoloading. The lower edge of the leader at the front end tends to separate from the surface of the sprocket 42 while the film 48 is being fed due to the rotation of the film 48 . This tendency is caused by the fact that the film 48 tends to curve in the width direction so that the surface coated with the emulsifier has a concave shape.

When the above-mentioned tendency increases, the leader at the front end of the film 48 separates from the circumferential surface of the sprocket 42 and hangs downward as it moves towards the circumferential surface of the spool 38, causing a plurality of the upper end portions of the sprocket 42 to hang down toward the upper perforation 48g. Not only does the engagement claw 42a become easily disengaged, but it also becomes difficult for the engagement claw 38a of the spool 38 to engage with the plurality of openings in the upper perforation 48g of the leader at the front end of the film 48.

FIG. 33 shows a detailed enlarged view 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 74m of the film guide member 74, the film guide rail 94 is formed not only to approach above and below the rotation trajectory of the engagement claw 42m at the upper end of the sprocket 42, but also to approach the upper and lower sides of the rotation locus of the engagement claw 42m at the upper end of the sprocket 42. It is formed so as to approach above and below the rotation locus of the engaging pawl 42b, and furthermore, it is formed slightly upward from the middle between the engaging pawl 42m at the upper end of the sprocket 42 and the engaging pawl 42b at the lower end. It is also formed at a position displaced by . These film guide rails 94 are connected to the sprocket 42
It extends horizontally parallel to the rotation locus of the engaging claws 42m and 42b at the upper and lower ends, and also extends from the sprocket 4.
In the radial direction of 2, the engagement claws 42m and 42b protrude further inward than the rotation locus of the protruding ends of the engagement claws 42m and 42b.For this reason, they are formed at the left end of the rear surface of the camera body chassis 10 immediately after the start of film autoloading. The upper perforation 48m and the lower part olefin 48b (see Figure 32) are engaged with the engaging claws 42m and 42b at the upper and lower ends of the sprocket 42 in the relief part 10a, and the film 48 is coated with an emulsifier in the width direction. Despite the tendency to curve to create a concave application surface, the film 48 will not disturb the upper and lower edges of upper perforation 48a and lower part olefin 48b, respectively, while in contact with sprocket 42. is pressed by the film guide rail 94 of the film guide member 74 toward the base of the engaging claws 42a, 42b at the upper and lower ends, so that the upper part of the film 48 is pressed against the upper part of the film 48 and the lower perforation 48a and the lower perforation 48b. Engaging claws 42a at the upper and lower ends of the sprocket 42
, 42b are effectively prevented from disengaging.

The film guide rail 94, which is formed at a position slightly displaced upward from the middle between the engaging pawl 42a at the upper end of the sprocket 42 and the engaging pawl 42b at the lower end, is indicated by the two-dot chain line in FIG. As shown in , immediately after the start of film autoloading, the plurality of engagement claws 42 a at the upper end of the sprocket 42 are only engaged with the plurality of openings in the upper perforation 48 a of the leader at the front end of the film 48 . Film 4 by rotation
This reliably prevents the lower edge of the leader at the front end from separating from the circumferential surface of the sprocket 42 while the sprocket 8 is being fed.

34 and 35, the engaging claws 42m at the upper end of the sprocket 42 are arranged so as to engage every other opening in the upper perforation 48g of the leader at the front end of the film 48. It shows the benefits it brings.

That is, immediately after the start of film autoloading, the engaging pawl 42 at the upper end of the sprocket 42 is positioned second from the beginning among the plurality of openings in the upper perforation 48a of the leader at the front end of the film 48, as shown in FIG. When the front end of the leader is initially engaged with the opening of the film guide rail 9 of the film guide member 74,
4 and was guided along the outer peripheral surface of the sprocket 42, the area between the front end of the leader and the second opening was slightly curled up as shown in FIG. 35 due to the contact. Even so, the region of the leader can be smoothly and effortlessly aligned on the outer peripheral surface of the sprocket 42.

On the other hand, the engagement pawl 42 at the upper end of the sprocket 42
a are arranged at six equal intervals so as to continuously engage with a plurality of openings in the upper perforation 48a of the leader at the front end of the film 48, the front end of the leader in the same manner as described above. is the film guide member 74
The sprocket 4 comes into contact with the film guide rail 94 of
If the region between the front end of the leader and the second opening is slightly rolled up due to the contact when the leader is guided along the outer peripheral surface of the leader, as shown in FIG. The engaging claw 42a located one position in front of the engaged claws 42a is about to face the film guide rail 94 of the film guide member 74, and by being rolled up, it can be moved from the second opening to the front end of the leader. Since the distance along the outer circumferential surface of the sprocket 42 to the second opening is different from the distance from the first engaging claw 42a to the immediately preceding engaging claw 42a, the upper perforation The engaging claw 42a located immediately in front of the leader cannot engage with the opening located first from the front end of the leader in the opening 41a.

The engaging claw 42m that does not engage with the first opening is the upper perforation 48a of the leader that it contacts.
Since the area between the plurality of openings is pushed into the gap between the pair of film guide rails 94 located near the upper and lower sides of the engaging claw 4251, film jams and film 4
This causes damage to the pushed-in area of the leader of No. 8.

FIG. 38 and FIG. 39 show that the engaging pawl 42a at the upper end of the outer peripheral surface of the sprocket 42 is engaged with every other opening in the upper perforation 48m of the leader. As shown, two other arrangements are shown which can exhibit the same effect as the arrangement of three arranged at equal intervals in the circumferential direction.

In FIG. 38, two engaging claws 42m are arranged at equal intervals in the circumferential direction at the upper end of the outer circumferential surface of the sprocket 42 so as to engage every other two openings of the upper perforation 48m. , Only one engaging pawl 42m in FIG. 39 is arranged at the upper end of the outer peripheral surface of the sprocket 42 so as to engage every sixth opening in the upper perforation 48a.

FIG. 40 and FIG. 41 show yet another arrangement of engaging pawls at the upper end of the outer peripheral surface of the sprocket 42. Here, two of the plurality of openings in the upper perforation 1 of the leader 48a at the front end of the film 48 are shown.
The engaging claws 42C and 42d are arranged on the outer circumferential surface so as to continuously engage one opening and not engage at least one opening before engaging the next two openings.

Here, the engaging pawl 42c is disposed in front of the other engaging pawl 42d in a predetermined rotating direction of the sprocket 42 for film autoloading operation. The tooth flanks on both sides of this front engaging pawl 42c have a line z1 of curvature larger than the impolinated curve with the diameter of the sprocket 42 as the base circle, similar to the engaging pawl 42g shown enlarged in FIG. 31. and an involute curve z2, and the tooth surfaces on both sides of the rear engaging pawl 42d are composed of an involute curve Z2.

The sprocket 42 has the two pairs of engaging claws 42c and 42d arranged as described above.
If the opening located closest to the front end of the leader among the plurality of openings in the upper perforation 48m of the leader at the front end of the reader is engaged first, it forms a pair with the engaged engagement claw 42c. As the sprocket 42 rotates, the engaging pawl 42d positioned behind the engaged pawl 42c engages with the opening located second closest to the front end of the leader among the plurality of openings. do. The rotational force from the sprocket 42 is applied to a pair of engaging claws 42c and 4.
2d to the upper perforation 48m of the leader at the front end of the film 48, and the film 48 is fed from the film path 14 into the spool storage chamber 40 by rotation of the sprocket 42.

In this case, the transmission of rotational force from the sprocket 42 to the leader at the front end of the film 48 immediately after the start of the film autoloading operation is transmitted between the pair of engagement claws 42c and 42d of the sprocket 42 and the leader at the front end of the film 48. Since this is done in combination with the upper perforation pin 48m of the leader, a pair of engaging claws 42c and 42d
The rotational force is distributed and applied to each of the two openings in the upper perforation 48a that are engaged with each other.

Therefore, when the flexibility of the film 48 is lost at low temperatures or when a large force is required to pull out the film 48 from the cartridge 46 for some reason, the upper perforation 4Bm of the leader at the front end of the film 48 can effectively prevent damage.

Two pairs of engagement claws 42c arranged as described above.

As shown in FIG. 43, the sprocket 42 having the sprocket 42d has the engaging pawl 42d located at the front end of the film 48 at the top of the leader part opening 48m, which is the closest to the leader among the plurality of openings. When the film 48 is first engaged with the opening located near the front end, as the sprocket 42 rotates, the film 48 is moved to the film guide sheet 76 or the film guide member 74 in the film path 14 by the engagement claw 42d.
However, as the front end of the leader comes into contact with the film guide sheet 76 and the guide rail 94 of the guide surface 74m of the film guide member 74 and receives resistance, as shown in FIG. The above-described engagement of the engagement claw 42d with the opening is released.

At this point, when the sprocket 42 continues to rotate further, the next pair of engagement claws 42C engage the upper perforation 48.
The engaging claw 4 engages with the opening located second closest to the front end of the leader among the plurality of openings of m.
As the sprocket 42 continues to rotate, the engaging claw 42d, which forms a pair with the engaging claw 2C and is located behind the engaged claw 42c, is located at the third position closest to the front end of the leader among the plurality of openings. the aperture in which it is located.

The rotational force from the sprocket 42 is applied to the pair of engagement claws 4.
2c, 42d to the upper perforation 48a of the leader at the front end of the film 48, and the film 48 is transferred to the film path 14 by rotation of the sprocket 42.
It is fed into the spool storage chamber 40 from inside. Another pair of engagement claws 4 located in front of the engaged engagement claw 42c
2d, there is a distance equal to two distances between the plurality of openings of the upper perforation 48a, so the area of the leader from the second opening to the front end of the leader is:
As shown in FIG. 45, as the sprocket 42 further rotates, the guide surface 74 of the film guide member 74
Due to the above-described action of the guide rail 94 of a, another pair of engaging claws 4 located in front of the engaged claw 42c
The film can be smoothly run over the area of the outer peripheral surface of the sprocket 42 up to 2d without causing any clogging.

As shown in FIG. 46, the sprocket 42 has the two pairs of engaging claws 42C and 142d arranged as described above, and as shown in FIG. When the opening located second to the front end of the leader among the plurality of openings in 48a is engaged first, as the sprocket 42 rotates, the film 48 is moved into the film path by the engaging claw 42d. 14, the leader is moved toward the guide surface 74m of the film guide sheet 76 and the film guide member 74, but the front end of the leader comes into contact with the guide rail 94 of the guide surface 74a of the film guide sheet 76 and the film guide member 74, and resists. By receiving this, the engaging claw 42 for the opening is
The above-mentioned engagement of d is released.

At this point, when the sprocket 42 continues to rotate further, the next pair of engagement claws 42c engage the upper perforation 48.
Among the plurality of openings in a, the opening located second closest to the front end of the leader is engaged, and the following situation is the same as that shown in FIG. 45.

FIG. 47 shows the engaging claws 42C, 42 shown in FIG. 41.
Engagement claw 42c that can obtain the same effect as the arrangement of d.
, 42d is shown. Here, only one pair of engaging claws 42c and 42d are arranged on the outer peripheral surface of the sprocket 42.

FIG. 48 shows another structure of the rear cover of the camera. The rear lid includes a main rear lid 36a that is supported on the left end of the rear surface of the camera body chassis 10 so as to be openable and closable, and covers an area other than the entrance of the cartridge storage chamber 12 on the rear surface in the closed position, and a right end of the main rear lid 36a. The sub-rear lid 36b is supported in a freely openable/closable manner by the rear cover 36b and covers only the entrance of the cartridge storage chamber 12 on the rear surface in the closed position.

The main power battery 44 and sprocket 42 are inside the main rear cover 36a.
and a spool 38 are housed therein.

Another sprocket 112 is provided on the inner surface of the main rear lid 36a near the right end. This sprocket 1
12 opens only the sub-rear lid 36b and opens the cartridge storage chamber 1.
When the cartridge 46 is loaded into the cartridge 46, the front end of the film 48 that has been pulled out in advance from the cartridge 46 is sent along the film path 14 to the sprocket 42 located at the left end of the film path 14, and It is used to feed the spool into the spool storage chamber 40.

(Effects of the Invention) As explained above, the film feeding mechanism of the camera of the present invention used in a film auto-loading type camera approaches and separates from the film placed at a predetermined position in the film path of the camera body. a movable member that is rotatably supported by the movable member and is moved from a separation position to an approach position at the start of a film autoloading operation; a sprocket having an engagement pawl that contacts the film at the position from the side on which the emulsifier is not applied and engages the perforation of the film; with the movable member disposed at the approach position; and a sprocket drive means for selectively driving the sprocket to rotate and feeding the film in the film path along the film path by the sprocket; The mechanism includes: a movable member that is movable toward and away from the film placed at a predetermined position in the film path of the camera body, and is moved from the apart position to the approach position at the start of film autoloading; the movable member is rotatable; By placing the movable member in a close position, the film at a predetermined position in the film path of the camera body comes into contact with the film from the side where the emulsifier is not applied, and the part resin of the film comes into contact with the film at a predetermined position in the film path of the camera body. a sprocket having an engaging pawl that engages; a sprocket driving means that selectively rotates the sprocket with the movable member disposed at the approach position and feeds the film in the film path along the film path by the sprocket; The engaging pawl of the sprocket engages with a perforation formed only on the leader at the leading end of the film disposed at a predetermined position in the film path of the camera body. arranged to engage a group of two mutually adjacent apertures disposed at least one or more spacings within the aperture;
The engagement surface of the engagement claw that engages with one opening located on the front end side of the film in one group among the plurality of openings in the perforation is a line with a smaller curvature than the involute curve whose base circle is the diameter of the sprocket. and the engaging surface of the engaging claw that engages with the remaining opening in the one group is constituted by the involute curve; when the movable member is placed in the approach position. In the part of the camera body that faces the sprocket,
The above-mentioned film is characterized in that a relief part is provided for accommodating the engaging claw protruding from the perforation opening of the leader at the leading end of the film toward the film emulsifier coated side and preventing contact with the protruding end of the engaging claw. For example, if the film winding spool storage chamber is placed behind the film path in order to change the overall external shape of the camera, including the rear cover, from its current oblong shape to improve the holdability of the camera. However, the film is moved from the film path into the film winding spool housing chamber so that the film can be wound around the spool in the spool housing chamber with the emulsifier coated surface facing inward in the radial direction of the spool. You can guide the film inside.

[Brief explanation of drawings]

1 is a schematic horizontal sectional view of a camera according to an embodiment of the present invention; FIG. 2 is a schematic longitudinal sectional view of the camera of FIG. 1; FIG. 3 is a schematic vertical sectional view of the camera of FIG. A schematic horizontal sectional view showing the camera with the back cover opened and the film installed at a predetermined position in the film path; FIG. 4 shows the camera shown in FIG. An enlarged vertical cross-sectional view schematically showing a state in which the upper edge of the film is prevented from separating from the film path by a film presser placed at the upper edge of the film path; FIG. A schematic exploded perspective view showing the film monitoring mechanism and film feeding mechanism related to the autoloading device located near the film path in the camera; Figures 6 and 7 are shown in Figure 5. A plan view schematically showing only the arrangement of the sprocket pawls arranged on the circumferential surface of the upper and lower ends of the sprocket shaft; FIG. 119 is a horizontal sectional view schematically showing an enlarged view of the main external appearance of the feeding mechanism; FIG. FIG. 10 is a schematic plan view showing the neutral state of the drive system in FIG. 9; FIG. 11 is a diagram schematically showing the control circuit of the drive system in FIG. 9; FIG. 1112 is a 's3 diagram A horizontal cross-sectional view schematically showing how the camera back is closed for automatic film loading in a camera; A flowchart schematically showing the movement of the drive system in Fig. 119 until the end; Fig. 11114 shows a state in which the sprocket shaft of the film feeding mechanism is driven by the drive system in Fig. 9 in the first half of the autoloading operation. Schematic plan views; Figures 15, 16, and 17 show that the front end of the film at a predetermined position in the film path is taken up by the sprocket shaft of the film feeding mechanism during the first half of the autoloading operation. Schematic horizontal sectional views showing enlarged sequentially how the film is fed onto the spool of the mechanism; Figure 3818 is a state in which the spool of the film winding mechanism is driven by the drive system of Figure 9 in the latter half of the autoloading operation. Figures 19 and 20 show how the spool of the film winding mechanism winds the front end of the film from the sprocket shaft of the film feeding mechanism in the latter half of the autoloading operation. Schematic horizontal cross-sectional views enlarged and shown sequentially; [Figure 21 shows that the sprocket pawl at the upper end of the sprocket shaft of the film feeding mechanism engages with the perforation on the top side of the front end of the film immediately after the start of the autoloading operation. 22 is an enlarged view of how the film guide rail provided in the camera body of the camera shown in FIG. 1 so as to protrude into the film path is useful in the state shown in FIG. 21. FIG. 23 shows a conventional camera in which the film guide rail, which is provided in the camera body so as to protrude into the film path, extends near the perforation on the upper edge side of the film in the state shown in FIG. A vertical cross-sectional view that enlarges and schematically shows the damaged state; FIG. 24 schematically shows the movement of the drive system in FIG. 9 as the film is wound up for each shot after auto-loading of the film is completed; Flowchart: Figure 25 shows a process that has been devised to eliminate the failure of engagement of the sprocket claw at the upper end of the sprocket shaft with the perforation on the upper edge side of the front end, which is caused by the front end of the film sagging immediately after the start of autoloading of the film. A schematic side view showing an enlarged view of the shape of the sprocket pawl; FIG. 26 shows the front end of the film wrapped around the sprocket shaft in a high temperature and high humidity condition during the first half of the film autoloading operation; FIG. 27 is an enlarged schematic horizontal sectional view of the guide member separated from the film and directed onto the spool of the film handling mechanism; FIG. 27 is a schematic longitudinal sectional view of the guide member of FIG. 26; FIG. 28 29 is an enlarged schematic horizontal sectional view showing a film guide protrusion provided in the camera body so as to protrude into the film path corresponding to the sprocket shaft; FIG. 29 is a schematic diagram of the film guide protrusion of FIG. 28; Fig. 30 shows that the sprocket pawl at the upper end of the sprocket shaft engages with the perforation on the upper edge side of the front end of the film due to the action of the film guide protrusion shown in Fig. 28 immediately after the start of the autoloading operation of the film; An enlarged schematic horizontal sectional view showing a well-performed condition; Figure 31 shows the engagement of the sprocket pawl at the upper end of the sprocket shaft with the perforation on the upper edge side of the front end of the film immediately after the start of the autoloading operation of the film; A schematic plan view showing an enlarged plan view of the planar shape of the sprocket pawl, which has been devised to achieve good alignment; An enlarged perspective view schematically illustrating the opening of the edges outward in the radial direction of the sprocket shaft: FIG. Figures 34 and 35 are vertical sectional views schematically showing an enlarged film guide rail on a film guide member provided on the back cover of the camera shown in Fig. 33, facing the sprocket shaft. Enlarged view of how the sprocket pawl at the top end of the sprocket shaft properly engages the perforation at the top edge of the front end of the film immediately after the film autoloading operation starts due to the action of the film guide rail on the film guide member on the back cover. Schematic horizontal cross-sectional views shown in sequence; FIG. 36 shows that the sprocket pawls at the upper end of the sprocket shaft in the camera of this embodiment engage every other opening in the perforations on the upper edge side of the front end of the film; The sprocket pawls are arranged on the circumference of the upper end of the sprocket shaft at intervals such that the sprocket pawls engage with the multiple openings of the perforations one by one. A schematic horizontal cross-sectional view showing an enlarged view of a film jam phenomenon that occurs immediately after the start of an automatic film loading operation when the camera is placed on a surface; FIG. An enlarged plan view schematically showing the arrangement of; ′! Figures s38 and 39 schematically show, on an enlarged scale, other arrangements of sprocket pawls that can prevent the film clogging phenomenon as shown in Fig. 36, similar to the arrangement of the sprocket pawls shown in Fig. 137. Plan view; FIG. 40 is an enlarged schematic horizontal sectional view showing another configuration of the sprocket pawl at the upper end of the sprocket shaft in the camera of this embodiment; FIG. 41 is a plan view of the sprocket pawl in FIG. Fig. 42 is an enlarged schematic horizontal section showing the first situation immediately after the start of the autoloading operation of the film by the sprocket pawl of Fig. 1140; Figures; Figures 43, 44, and 45 are enlarged schematic horizontal sectional views showing a second situation in the first half of the film autoloading operation by the sprocket pawl of Figure 40; 1140 is an enlarged schematic horizontal sectional view showing a third situation immediately after the start of the film autoloading operation using the sprocket pawl of FIG. 1140; FIG. FIG. 48 is an enlarged plan view schematically illustrating a variant of the sprocket pawl configuration that acts similarly to the pawl configuration; and FIG. It is a horizontal sectional view. 10... Camera body chassis, 10a... Relief part,
12... Patrone storage chamber, 14... Film passage, 36... Rear cover, 38... Spool, 38b...
Spool drive gear, 42... sprocket, 42g,
42b... Engaging claw, 42c... Sprocket drive gear train, 46... Patrone, 48... Film, 4
8a... Upper perforation, 48b... Lower perforation date, 50... Lower cartridge holder, 54... Upper cartridge holder, 56... Film guide pair, 56a, 56b... Film guide ,5
8... Film guide pair, 58a, 55b... Film guide, 60... Guide roller, 68... Drive mechanism, 70... Bidirectional motor, 72... Sprocket rotation measuring unit, 74...・Film guide member,
74a... Kite surface, 94... Film guide rail, 100... Planetary gear, 102... Internal gear member,
102a...Internal teeth, 104...Control circuit, 110.
...Involute curve.

Claims (1)

[Claims] 1. Used in a film auto-loading type camera, the device is provided so as to be able to approach and separate from the film placed at a predetermined position in the film path of the camera body, and is used to start the film auto-loading operation. A movable member is rotatably supported by the movable member, and when the movable member is placed in the approach position, the emulsifier of the film is applied to the film at a predetermined position in the film path of the camera body. a sprocket having an engaging pawl that contacts from the uncoated surface side and engages with the perforation of the film; selectively driving the sprocket to rotate with the movable member disposed at the approaching position; A film feeding mechanism for a camera, comprising: sprocket driving means for feeding film therein along a film path by a sprocket. 2. The engagement pawl of the sprocket that engages with a perforation formed only in the leader at the leading end of the film disposed at a predetermined position in the film path of the camera body is connected to at least one of the plurality of openings of the perforation. The engaging surface of the engaging pawl is formed by a line with a smaller curvature than the involute curve whose base circle is the diameter of the sprocket, and the movable member is placed in a close position. The part of the camera body that faces the sprocket when the film is sprocketed contains an engaging pawl that protrudes from the perforation opening of the leader at the tip of the film toward the film emulsifier coated side, and makes contact with the protruding end of the engaging pawl. The film feeding mechanism for a camera according to claim 1, further comprising a relief portion for preventing the above. 3. It is used in a film auto-loading type camera, and is provided so that it can approach and move away from the film placed at a predetermined position in the film path of the camera body, and is moved from the separation position to the approach position at the start of the film auto-loading operation. a movable member that is rotatably supported by the movable member, and the side of the film that is not coated with emulsifier with respect to the film at a predetermined position in the film path of the camera body by placing the movable member in a close position; a sprocket having an engaging pawl that contacts with the perforation of the film and engages with the perforation of the film; selectively driving the sprocket to rotate with the movable member disposed at the approach position so that the film in the film path is moved by the sprocket; a sprocket drive means for feeding the film along the film path; and a sprocket that engages with a perforation formed only in the leader at the leading end of the film disposed at a predetermined position in the film path of the camera body. The engaging claw is provided to engage with a group consisting of two mutually adjacent openings arranged at least one interval among the plurality of openings of the perforation, The engaging surface of the engaging claw that engages with one opening located on the leading end side of the film in one group is constituted by a line having a smaller curvature than the involute curve whose base circle is the diameter of the sprocket, and The engagement surface of the engagement claw that engages with the remaining one opening in the above one group is configured by the above-mentioned involute curve, and when the movable member is placed in the approach position, the engagement surface of the camera body that faces the sprocket. The part is provided with a relief part for accommodating the engaging claw protruding from the perforation opening of the leader at the tip of the film toward the film emulsifier coated side and preventing contact with the protruding end of the engaging claw. A camera film feeding mechanism characterized by: 4. Engages with another perforation formed on the opposite side in the width direction of the film from the perforation formed only on the leader at the leading end of the film located at a predetermined position in the film path of the camera body. The engaging pawl of the sprocket is provided to continuously engage with the plurality of openings of the other perforation, and the sprocket is equipped with a sprocket that measures the amount of film fed by the sprocket from the rotation of the sprocket. A film feeding amount measuring means for generating an amount measuring signal is provided, and the film feeding amount measuring means and the sprocket driving means are arranged such that the amount of film fed by the sprocket driving means is equal to the amount of film fed from the film feeding amount measuring means. It is characterized by being connected to sprocket drive control means for controlling the sprocket drive means to stop feeding the film by the sprocket drive means when it is detected that a predetermined amount has been reached based on the feed amount measurement signal. A film feeding mechanism for a camera according to claim 1 or 3.