JP2763381B2 - Camera and film feeder - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a camera capable of using a film cartridge configured to drive a film supply means of a film cartridge and to feed a film from the film cartridge, and a film feeder. It concerns the device.

[Background of the Invention]

2. Description of the Related Art Conventionally, there has been known a camera that automatically feeds a film to a first frame (automatically by a motor) after loading a film cartridge or by a certain operation.

Also, a film cartridge configured to push out a film housed in the cartridge by rotation of a supply spool is proposed in US Pat. No. 4,834,306.

However, if a camera using this kind of film cartridge attempts to carry out the above-mentioned film feeding, if the film tip is caught for some reason (dust or adhesive in the film cartridge) at the time of starting the film feeding, There is a problem that the film is bent due to the method of pushing out the film, and a normal film feeding operation (such as idle feeding or auto loading) cannot be performed.

[Object of the invention]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an actuating means for operating a film supply means of a film cartridge in a film feeding direction and a film rewinding direction. After the operation in the return direction, it is operated in the film feeding direction and has control means to feed the film from the film cartridge.This prevents the film from being bent or caught when feeding the film due to dust or adhesion in the film cartridge. It is an object of the present invention to provide a camera and a film feeding device capable of performing the above.

(Example of the invention)

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 6 is a view of the camera of the present embodiment viewed from the rear side, and the back cover is removed for convenience of explanation. In the figure, 1 is a camera body, 2 is a groove for a back cover, and 3 is an aperture. An opening in a certain place. Reference numerals 4 and 5 denote an inner rail and an outer rail for film guide, respectively. Reference numeral 6 denotes a patrone chamber for accommodating an extruded film cartridge described later. Reference numeral 7 denotes a fork as a spool engaging member, which engages with a supply spool in the film cartridge and is driven by a film feeding mechanism of the camera as described later. 8
Is a take-up spool which is disposed in the spool chamber 9 and is configured to automatically wind the leading end of the film by rollers 10 and 11 by a known method as shown in JP-A-60-45231. It is configured.

3 to 5 show one embodiment of an extruded film cartridge used in the camera of the present embodiment. FIG. 3 is a perspective view, FIG. 4 is a horizontal sectional view, and FIG. FIG. 4 is a sectional view taken along the line AA.

3 to 5, reference numeral 21 denotes a cartridge housing in which a supply spool 22 is rotatably supported. Further, the supply spool 22 has an engaging portion 22a at the end thereof for engaging with the fork 7. A roller 23 is rotatably supported by the cartridge housing 21. In this embodiment, the three rollers 23 and the inner projecting portion 21 a of the cartridge housing 21 are attached to the film 24 wound around the supply spool 22.
Is configured to come into contact with the outermost periphery. Therefore, when the supply spool 22 is rotated in the film pushing direction (counterclockwise direction in FIG. 4), the film 24 is pushed out from the mouth 25 while spreading, and at this time, the roller 23 and the inner protruding portion 21a of the cartridge housing 21 are moved. The roller 23 contacts the outermost periphery of the film 24, and the roller 23 rotates and rolls, so that the frictional force between the film 24 and the film 24 becomes very small. As a result, it is pushed out smoothly from the mouth 25 without buckling unless it is caught. Also, film
When the film 24 is rewound, the film 24 is rewound while being rewound to the supply spool 22 by rotating the supply spool 22 in the film rewinding direction (clockwise in FIG. 4).

7 and 8 are views showing a film feeding mechanism according to an embodiment of the present invention. FIG. 7 is a view showing a state where the film is extruded and then the film is wound up. FIG. 8 is a view showing a state where the film is unwound. FIG.

7 and 8, reference numeral 31 denotes a film driving motor, and a pinion 32 is fixed to the output shaft 31a. 8
Is a take-up spool described in FIG. 5, and 10 and 11 are rollers. At the upper end of the take-up spool 8, a take-up gear 34 is mounted via a one-way clutch 33.
The one-way clutch 33 is a known free-rotation clutch disclosed in, for example, Japanese Patent Application Laid-Open No. 55-17175 by the present applicant. In FIG. 7, when the winding gear 34 rotates counterclockwise in FIG. 8, the driving force is not transmitted when rotated clockwise. A two-stage gear 35 connects the pinion 32 and the take-up gear 34.

Therefore, the pinion 32, the two-stage gear 35, and the winding gear 34
Constitute a film winding gear train.

Reference numeral 36 denotes a sun gear, which is a planetary lever 3 rotatable around a shaft 36a.
7, and a gear 38 is fixedly provided at the upper end. 39
Denotes a two-stage gear, which connects the pinion 32 and the gear 38.
At one end of the planetary lever 37, a planetary gear 40 is rotatably supported. Numeral 7 denotes a fork described with reference to FIG. 6. A fork gear 41 is fixedly mounted on the fork, and an extruding gear 43 is further disposed on the fork via a one-way clutch 42. The one-way clutch 42 has the same structure as the one-way clutch 33 described above, and transmits the driving force to the fork 7 when the pushing gear 43 is rotated counterclockwise in FIG. Is not transmitted. When the sun gear 36 rotates counterclockwise from the state shown in FIG. 8, the planetary gear 40 is connected to the pushing gear 43 as shown in FIG.

Therefore, pinion 32, two-stage gear 39, gear 38, sun gear
36, the planet gear 40 and the pushing gear 43 constitute a gear train for film pushing. The reduction ratio of the film pushing gear train is set to be larger than the above-described film take-up gear train.

Two-stage gear 45 connected to rewind gear 41 via gear 44
The upper large gear 45a is connected to the planetary gear 40 as shown in FIG. 8 when the sun gear 36 rotates clockwise in FIG.

Therefore, pinion 32, two-stage gear 39, gear 38, sun gear
36, planetary gear 40, two-stage gear 45, gear 44 and rewind gear
41 constitutes a film rewind gear train. The reduction ratio of the film rewind gear train is set to be larger than the reduction ratio of the film rewind gear train described above.

The operation of the film feeding mechanism configured as described above will be described below.

First, the cartridge housing 21 shown in FIG. 3 is loaded into the patrone room 6, and at this time, the mouth 25 of the cartridge housing 21 is loaded.
No film 24 comes out. Next, when the back cover of the camera (not shown) is closed, a back cover switch (shown in FIG. 1), which will be described later, is turned on, and the film drive motor 31 is energized by this signal. Then, the sun gear 36 also rotates clockwise, and the planetary gear
The orbit 40 orbits around the sun gear 36 in the clockwise direction, resulting in the state shown in FIG. Then, each gear 32, 39, 38, 36, 40, 4
5, 44 and 41 are connected, the rewind gear 41 rotates clockwise, and the fork 7 integrated with the gear 41 also rotates clockwise. Therefore, the supply spool 22 engaged with the fork 7
Also rotates clockwise in FIG. 3 to rewind the film 24. By this rewinding, it is possible to prevent the film from being caught by dust or adhesion in the cartridge at the leading end of the film without buckling the film.

Then, it rotates counterclockwise. Then sun gear
36 also rotates counterclockwise, so planetary gear 40 is sun gear
It revolves around 36 in a counterclockwise direction to reach the state shown in FIG. 7, and the planet gear 40 and the delivery gear 43 are connected. Accordingly, the pushing gear 43 rotates counterclockwise, so that the driving force is transmitted to the one-way clutch 42, and the fork 7 rotates counterclockwise. Since the fork 7 is engaged with the engaging portion 22a of the supply spool 22 in the cartridge housing 21, the supply spool 22 also rotates counterclockwise in FIG. 4, and the film 24 is pushed out from the mouth 25. At this time, as described above, the film 24 is extruded without buckling because its tip is not caught by dust or stickiness in the cartridge. Thus, the film pushing operation proceeds, and the leading end of the film 24 reaches the take-up spool 8. When the film drive motor 31 starts rotating in the counterclockwise direction, the take-up spool 8 rotates the gears 32, 35 and
The film is rotated in a counterclockwise direction by a film winding gear train of 34. At this time, the one-way clutch 33 transmits the driving force because the take-up gear 34 rotates counterclockwise. Therefore, the leading end of the film 24 is wound around the take-up spool 8, and the take-up operation is started. At this time, since the film pushing-out gear train has a larger reduction ratio than the film winding-up gear train, the rotation of the winding gear 34 is faster than the rotation of the pushing gear 43. Therefore, the fork 7 is driven by the take-up gear 34 via the take-up spool 8, the film 24, and the supply spool 22, and the fork 7 rotates faster than the extruding gear 43, and the one-way clutch 42 Block transmission. That is, since the rotation of the fork 7 is faster than the rotation of the pushing gear 43, the state of the pushing gear 43 is the same as the reverse rotation of the pushing gear 43 when viewed relatively, and the one-way clutch 42 interrupts the transmission of the driving force. Therefore, the winding operation of the film 24 is performed only by the winding spool 8 from the time when the leading end of the film 24 is wound around the winding spool 8.

When the photographing of all the frames of the film 24 is completed, the photographing completion of the film is detected as described later, and the film driving motor 31 is rotated clockwise in FIG. The electric circuit for rotating the film driving motor 31 in the normal and reverse directions is known by the present applicant in Japanese Patent Application Laid-Open No. Sho 59-95520. Then, the sun gear 36 also rotates clockwise, and the planetary gear 40 revolves clockwise around the sun gear 36 to be in the state shown in FIG. Then, each of the gears 32, 39, 38, 36, 40, 45, 44,
The rewind gear 41 rotates clockwise, and the fork 7 integrated with the gear 41 also rotates clockwise. Therefore, the supply spool 22 engaged with the fork 7 also rotates clockwise in FIG. 4, and the rewinding of the film 24 is started. When the film drive motor 31 rotates clockwise, the winding gear 34 also rotates clockwise. However, as described above, the rewinding gear train has a larger reduction ratio than the winding gear train. , The take-up gear 34 rotates faster than the take-up spool 8 rotated clockwise through the fork 7, the supply spool 22, and the film 24, and the one-way clutch 33 does not transmit the driving force. . Therefore, the film can be rewound without interfering with the winding gear train.

The film cartridge suitable for the above-mentioned film feeding system is not limited to the one in this embodiment, and any other type can be used as long as the film can be pushed out of the cartridge by rotation of the supply spool. May be adopted.

FIG. 1 shows an example of an electric circuit block for controlling the above operation.

In the figure, reference numeral 701 denotes a perforation detection circuit for detecting a hole in the perforation of the film 24 which is constituted by a photoreflector, and 702 denotes the film driving motor for winding and rewinding the film 24 and further extruding the same. A film driving circuit for driving the film 31, a CPU 703 which is a microcomputer for controlling the entire camera, a photometry circuit 704 for performing an appropriate exposure on the film 24, a shutter control circuit 705 for controlling the opening and closing of the shutter, a 706 Is a back cover switch that turns on and off in response to opening and closing of the back cover, 707 is a release switch that turns on and off in response to operation of the shutter release button by the photographer, and 708 detects whether a film cartridge is loaded. Cartridge presence / absence switch, 709 is film 24 from film cartridge
An ISO and frame number detecting circuit 710 for detecting the ISO information and the number of frames that can be photographed, and 710 is a display circuit for giving a warning of a failure in the idle feeding.

FIG. 2 is a flowchart showing the operation of the CPU 703 shown in FIG. 1. This operation will be described below.

In step 801, the state of the back cover switch 706 is checked to determine whether the back cover is closed. If the back lid is closed, go to step 802; if it is open, go to step 8
Repeat 01.

In step 802, it is determined whether or not a film cartridge is loaded based on the state of the cartridge presence / absence switch 708. If it is loaded, the process proceeds to step 803. If it is not loaded, steps 801 and 802 are repeated.

In step 803, the number of photographable frames of the film 24 is detected by the ISO and frame number detection circuit 709.

In step 804, it is determined whether or not there is information on the number of frames that can be photographed. If there is, the process proceeds to step 805, and if not, the process proceeds to step 806.

In step 806, timer times T1 and T2 are set according to the number of frames that can be photographed. This is because if the number of frames in the same film cartridge is different, there will be a difference in the amount of idle rotation of the spool. If the number of frames is small, the timer times T1 and T2 are set longer.

In step 806, since there is no information on the number of frames that can be photographed, the timer times T1 and T2 are set to predetermined values corresponding to the longest time.

At step 807, the value of the film counter N is set to "0".
To reset.

In step 808, the film drive circuit 702 winds (rewinds) the film 24 in the cartridge housing 21 as described above.

At step 809, the timer time T1 set at step 805 or 806 is counted, and when the counting is completed, the process proceeds to step 810. At step 810, the film driving motor 31 is stopped, and the winding operation of the film 24 is ended. .

At step 811, the film 2 is inserted from the cartridge housing 21.
In order to push out 4, the film drive motor 31 is rotated in the winding direction opposite to the above-described direction.

In step 812, counting of the timer time T2 set in step 805 or 806 is started.

In step 813, the perforation is detected by the perforation detection circuit 701. The detection method here is to detect the film 24 that has come out by the above-mentioned extruding operation in a place where the film 24 is not present, but it is not a hole of the perforation at first, but it can be detected by the circuit 701 in the same manner. , Is diverted. If no perforation is detected, the process proceeds to step 814.

In step 814, it is determined whether or not the timer time T2 has elapsed, and if not, steps 813 and 814 are repeated.
If it has passed, the process proceeds to step 815.

In step 815, the display circuit 710 indicates the failure of the idle feeding.
AL (Auto Loading) error is displayed and step 816 is displayed.
Proceed to.

At step 816, the film driving motor 31 is stopped, the process returns to step 801 and the film is again wound, and
Attempt to set the film.

On the other hand, if the perforation has been detected in step 813, that is, if the film 24 has been detected, the flow advances to step 829.

In step 829, the AL displayed by the display circuit 710
Erase the error display (if there is no AL error display, leave it as it is)
Proceed to step 817.

 In step 817, the timer T3 is started.

In step 818, the perforation is detected by the perforation detection circuit 701. If detected, the process proceeds to step 819, and if not detected, the process proceeds to step 820.
Proceed to.

At step 819, the number of perforations is counted.

In step 820, it is determined whether or not the timer T3 has elapsed for one second or more. If the timer has elapsed, that is, if there is no perforation even if the timer is wound up for one second or more, shooting up to the last frame of the file 24 is performed. It is determined that the process is completed and the extrusion cannot be performed any more, and the process proceeds to step 821.

In step 821, the film driving motor 31 is driven to start the rewinding of the film 24 as described above.

At step 822, the perforation counter is decremented each time a perforation is detected.

At step 823, the perf counter is set to 8
It is determined whether or not the rewind of one frame is completed by counting eight perforations. If it is a multiple, the process proceeds to step 824, and it is not a multiple of eight. If so, return to step 822.

In step 824, the value of the film counter N is decremented by one.

At step 825, it is determined whether or not the film counter N is "0". If not, the process returns to step 822, and
If "0", the process proceeds to step 826.

In step 826, the operation in the winding direction is continued for a predetermined time.

In step 827, the drive of the film drive motor 31 is stopped, and the flow advances to step 828.

At step 828, the back lid is opened (back lid switch 706).
Wait until the film 24 is taken out, and return to step 801.

If it is determined in step 820 that one second has not elapsed in timer T3, the flow advances to step 829.

At step 829, the perf counter is set to 8
(It is assumed that the winding of one frame is completed by counting eight perforations). Otherwise step
Returning to 817, if it is a multiple of 8, go to step 830.

At step 830, the value of the film counter N is incremented by one.

 In step 831, the timer T3 is reset.

In step 832, it is determined whether or not “N ≧ 4”. If N <4, the process returns to step 817, and if N ≧ 4, the process proceeds to step 833. Here, 3
It is assumed that frames are skipped and the fourth frame is the first frame to be photographed.

In step 833, the film drive motor 31 is stopped, and the film winding is stopped.

At step 834, the value of "film counter value N-3" is displayed on the display circuit 710.

In step 835, it is determined whether or not the release switch 707 has been turned on.
Continue to 836.

In step 836, the side light circuit 704 is operated to obtain photometric information.

At step 837, the shutter control circuit 705 is operated to control the opening and closing of the shutter.

In step 838, winding of one frame of the film 24 is started, and the process returns to step 812 to repeat the photographing sequence.

The present invention can be similarly applied to a pre-wind camera, and it goes without saying that the same effect can be obtained.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide a camera and a film feeding device capable of preventing an accident such as bending or catching of a film at the time of feeding the film due to dust or adhesion in the film cartridge.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a camera showing one embodiment of the present invention, FIG. 2 is a flowchart showing the operation thereof, FIG. 3 is a perspective view of a film cartridge according to the present invention, and FIG. FIG. 5 is a sectional view taken along the line AA of FIG. 4, FIG. 6 is a view showing the camera of one embodiment of the present invention viewed from the back side, FIG. 7 and FIG. FIG. 2 is a perspective view showing a film feeding mechanism of one embodiment. 31 Film drive motor 702 Film drive circuit 703 CPU

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-54-26724 (JP, A) JP-A-61-156244 (JP, A) JP-A-62-160435 (JP, A) JP-A-63-156 169631 (JP, A) JP-A-62-238541 (JP, A) JP-A-64-66634 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03B 17/00 G03B 17 / 42

Claims (2)

(57) [Claims] An operating means for operating a film supply means of a film cartridge in a film feeding direction and a film rewinding direction; and after operating the film supply means of the film cartridge in the film rewinding direction by the operating means, A camera having control means for operating in a film feeding direction and feeding a film from a film cartridge. 2. An operating means for operating a film supply means of a film cartridge in a film feeding direction and a film rewinding direction, and after operating the film supply means of the film cartridge in the film rewinding direction by the operating means, Control means for operating the film in the film feeding direction and feeding the film from the film cartridge.