JPH0553192A - Film feeding device for camera - Google Patents

Abstract

PURPOSE:To reduce a time difference between a take-up time and a rewinding time by rewinding a film after taking up the film by the amount of two frames and a prescribed length at the time of taking up the film, and rewinding the film by every two frames at the time of rewinding the film. CONSTITUTION:When the leading end of the film 1 is laid on a reel 2 and a back cover 3 is closed, the film 1 is pressed by a pressure plate 4, and then, a film switch 5 is turned on. After this, a shutter release is lightly depressed by one step, a motor driving circuit is operated, and then, a motor 6 starts to rotate forward, a take-up mechanism is actuated by the forward rotation of the motor 6, and then, the reel 2 is rotated. Also at the time of photographing in a film 1 take-up direction, after the motor 6 is rotated forward so as to take up the film 1 by the amount of two frames and a prescribed length equal to or below the length of one frame, the motor 6 is reversely rotated so as to rewind the film 1 as long as the prescribed length. Also, at the time of photographing in a film 1 rewinding direction, the motor 6 is reversely rotated so as to rewind the film 1 by every two frames.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding device for a camera which winds and rewinds a film by using one electric motor.

[0002]

2. Description of the Related Art In recent years, with the electrification of cameras, film feeding is also automatic load (automatic loading), automatic wind (automatic winding), automatic rewind (automatic rewinding).
As mentioned above, automation by motor drive is being promoted. In such a camera, after the exposure is completed, the film is fed frame by frame in the winding direction, and when the winding is completed, the entire exposure screen is rewound into the patrone. In addition, there is a system called preloading, in which all the film is first wound up and then the exposed film is wound into the rewinding patrone frame by frame after the exposure is completed.

In such a conventional apparatus, the rewinding time and the preloading time may take several minutes when the power supply voltage drops because of winding and rewinding the entire film, and it is desired to immediately shoot the next scene. In that case, it is a big obstacle because it cannot be dealt with. Also,
With a camera equipped with an auto-return device, rewinding will suddenly start when the entire film has been shot, so that noise and time will be a long time inconvenient in situations such as weddings and concerts where quietness is required. is there. Therefore,
To reduce the rewinding time, it is sufficient to increase the film feeding speed, but due to the relationship with the power supply and the required torque, it is not possible to expect a significant reduction in the time, and there is a limit to the reduction of drive noise.

Therefore, the applicant of the present invention is the Japanese Patent Application No. 63-2669.
In No. 7, the film is fed every two frames when it is wound up, and when it is rewound when the film is rewound, it is set on the unexposed screen that is not exposed when the film is wound up. We proposed a film feeding device that eliminates rewinding time. The film rewinding control in this film feeding device is
When the film is fed in the rewinding direction, three frames are rewound and then one frame is wound up. By constantly stopping the film feeding in the winding direction, a constant amount of film overrun is generated in one direction. ..

In many of the auto-loading type cameras of this kind, a motor for winding and rewinding the film is arranged in the vicinity of the film winding mechanism, and the film is rewound between the motor and the film rewinding shaft. Since there is a film exposure screen, multiple gear trains (eg 8
The rewind speed is always slower than the hoist speed. Therefore, in the feeding device that winds up two frames in the forward direction, rewinds three frames in the backward direction and winds one frame as in the above-mentioned prior application, there is a considerable difference in the film feeding time between the winding direction and the rewinding direction after each shooting. There is a feeling of strangeness because it comes out.

Moreover, in a film feeding apparatus of the type in which the film is wound and rewound by switching the planetary gears in the film feeding mechanism by the forward and reverse rotations of the motor, when the film is photographed in the winding direction, the film rewinding mechanism is used. Since the power transmission system is separated from the motor by the planetary gear, the rewind shaft connected to the film spool is in a state in which it is easy to rotate, and the film wound in the cartridge loosens, and the film is then wound. When the film is fed in the rewinding direction, after the looseness is absorbed, the film is rewound substantially, and an extra rewinding drive is required, which takes time. Therefore, in order to prevent this slack when winding, conventionally, the motor is slightly rotated in the rewinding direction immediately after winding,
The method is to connect the motor and the rewind shaft.
However, in this method, the rewinding shaft must be controlled so that it does not rotate at all, so delicate time management is necessary.

Further, since the film can be photographed when it is completely pulled out from the patrone,
If the exposed portion is less than the size of one frame, this portion may be cut off as an incomplete portion during development.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide a film feeding device for a camera which winds and rewinds a film by using an electric motor. When the film is completely fed, the film wound in the cartridge is prevented from being loosened, and the exposure screen at the edge of the film on the cartridge side is cut off when cutting the film and the film shaft. Prevent it from happening,
The purpose is to reduce the time difference between the film winding time and the film rewinding time.

[0009]

According to the present invention, the above object is to transmit the rotation of one DC motor to a film winding spool and a film rewinding shaft via a gear train.
Equipped with a film feed drive system that winds the film in the forward rotation of the DC motor and rewinds the film in the reverse rotation.When the DC motor is in the forward rotation, the planetary gears in the film feed drive system transmit the film to the film rewind shaft. If not, the planetary gears are used to transmit the film to the film rewinding shaft when the DC motor rotates in the reverse direction, and the camera is used for shooting in both the winding direction and the rewinding direction. In the film feeding device, when filming in the winding direction, the film is wound by a predetermined length from two frames and then rewound by a predetermined length, and in filming in the rewinding direction, the film is rewound by two frames. The
Achieved by a film feeding device of a camera equipped with a film feeding means for controlling the DC motor and the film rewinding shaft to be in a connected state both during filming in the winding direction and during filming in the rewinding direction. To be done.

[0010]

In the film feeding apparatus of the camera of the present invention, when the film winding control means shoots the film in the film winding direction, the film is wound by a predetermined length of two frames and one frame or less, and then rewound by a predetermined length. And the rewinding control means controls the film to rewind every two frames at the time of shooting the film in the rewinding direction.
Control is performed so that the film feeding is completed while the connection from the film feeding motor to the film rewinding shaft is maintained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an autoload mechanism in the film feeding apparatus. When the front end of the film 1 is placed on the reel 2 and the back cover 3 is closed, the film 1 is pressed by the pressure plate 4 and the SF switch ( Film switch)
5 is turned on. After that, when the shutter release is pushed down by one step, the motor drive circuit operates and the motor 6 starts to rotate normally. The forward rotation of the motor 6 activates a winding mechanism described later to rotate the reel 2. The perforation of the film 1 is near the back cover guide roller 8
The film 1 is wound around the reel 2 by engaging with a. Printed boards 7a and 7b are provided on one side of the sprocket 7, and a piece of an SSP switch (sprocket switch) 9 is in contact with the printed boards 7a and 7b, and the SSP switch 9 is rotated according to the rotation of the sprocket 7. Is turned on and off five times (Film 1 is skipped by 5 frames). The sprocket 7 is configured to rotate once when the film is fed by one frame. Therefore, the SSP switch 9 also outputs an on-off or off-on signal (hereinafter referred to as an SSP signal) for each frame. This SSP
When the signal is sent 5 times, the brake is applied, and after 50 ms, the motor is reversed (rewind R), that is, the film is rewound for one frame and braked (brake B), that is, film 1 is used for 4 frames in total. Auto-loading is completed after feeding by minutes.

2 and 3 are perspective views showing a film winding and rewinding mechanism, and the same components as those in FIG. 1 are designated by the same reference numerals.

When the motor 6 rotates in the normal direction, the gear attached to the motor 6 rotates in the direction of the arrow, and the first gear 10, the second gear 11, and the third gear 12 meshing with the gear rotate.

Since the third gear 12 further rotates the drive gear 13 and the reel intermediate gear 14, the rotation of the motor 6 is transmitted to the reel 2. The perforation of the film 1 is fitted into the claw portions 2a of the reel 2 to form a tightly wound state, which is wound around the reel 2 and wound up.

FIG. 4 shows the meshing state of the gears during the winding operation. The rotational force of the motor 6 is transmitted only to the reel 2 side and not to the rewinding shaft 17 side.

On the other hand, during the rewinding operation, the motor 6 is rotated in the reverse direction, the reel intermediate gear 14 is disengaged from the reel 2, and the sprocket intermediate gear 18 meshes with the rewinding first gear 19, as shown in FIG. The rotational force of the motor 6 is transmitted to the rewind shaft 17 to rewind.

FIG. 6 is a block diagram of an electric circuit of the film feeding apparatus, in which the same components as those in FIG. 1 are designated by the same reference numerals.

In the figure, a motor drive circuit 20 controls the rotation of the motor 6, a film counter 21 is composed of an LCD or the like, displays the number of films taken, and a photometric circuit 22 measures the brightness of the object by means of a photodiode. .. The exposure control circuit 24 controls the shutter speed by turning on and off the magnet 25 according to the brightness of the subject, and the automatic focus detection and control circuit 26 detects the focus of the taking lens and moves the taking lens to the focus position. The code detection circuit 27 reads the DX code attached to the cartridge.
A microcomputer 28 controls each part of the device.

Next, the switches will be described. The rewinding switch 29 is turned on when the film is rewound, and the S1 switch 30 is turned on when the release button is pushed down by one step.
The S2 switch turns on when the release button is pushed further down.

The motor drive circuit 20 is mainly composed of four bipolar transistors, and control signals are output from the output ports M1 to M4 of the microcomputer 28 to the bases of the respective transistors so that the motor rotates in the forward and reverse directions. The brake is controlled as shown in Table 1 below. Although a bipolar transistor is used for the motor drive circuit 20 in this embodiment, the present invention is not limited to this, and a MOS (complementary metal oxide semiconductor) transistor may be used.

[0022]

[Table 1] That is, the direction of the drive current of the motor 6 is changed by the switching operation of the transistor to make forward and reverse rotations, and both terminals of the motor 6 are grounded so that the motor 6 does not overrun due to the back electromotive force of the coil in the motor 6. I am putting on.

The operation of the embodiment will be described below with reference to the flowcharts and timing charts. The symbols used in the flowchart are defined as follows. If the code is the following, the following processing is performed. W ... Winding up (corresponding to the motor forward rotation in Table 1) R ... Rewinding (corresponding to the motor reverse rotation in Table 1) B ... Stopping (Table 1) C ... Count r ... Initial state (corresponding to the initial state of Table 1) / ... Timer set FIG. 7 is a flowchart showing the entire photographing sequence.

In this sequence, REW = 0 or S1 = 0
When the condition of is satisfied, it is started (START). If the rewind switch 29 is on (REW = 0), the rewind subroutine is executed (REWsub), and the film is rewound. If the rewind switch 29 is not on, the S1 switch is automatically turned on (S1 = 0)
If the SF switch 5 is turned on (SF = 0), it is determined whether the counter value of the C counter for counting the number of films is “0” (C = 0), if this counter value is "0", the autoload subroutine is executed (ALsu
b). If a film is loaded, then check the battery (BCsub) and read the DX code (DXsu).
Each sub-routine of b) and distance measurement (AFsub) is sequentially executed. When the release button is further depressed by one step, the switch S2 turns on (S2 = 0) and the photographing lens drive (LD
Sub) and shutter drive (SDsub) subroutines are executed. When the finger is released from the release button, the switch S2 is turned off (S2 = 1), and lens charging (LCsub) and film winding (Wsub) are performed.

FIG. 8 shows an auto load subroutine (ALs
ub), and here, first, the output port M of the microcomputer
1 and M2 are set to a logic level of "0" to rotate the motor 6 in the normal direction (winding W), the counter value of the A counter is set to "5" (A ← 5), and the timer is set for 5 seconds (5S Ti
mer Set). If the SSP switch 9 is turned off within 1 second (SSP = 1), the flow proceeds the next time and 5 seconds have passed without being turned off (Timer = 0), it is an abnormal situation and therefore the process proceeds to the NG subroutine (NGsub). An appropriate warning is given, for example, by blinking the film counter 21. Next, set the timer for 1 second (1S Ti
If the SSP switch 9 is turned on (SSP = 0) this time, this loop is continued until the counter value of the A counter becomes “0”. That is, the falling edge of the SSP signal is detected in the step surrounded by the broken line X1. The film advances one frame for each falling edge, but
When the number of films is detected, that is, when the film is wound up by 5 frames, the output ports M1 and M3 are set to the logic levels of "1" and "0", respectively, and the motor 6 is braked (brake B).
2 and M4 are set to "1" and "0" logic levels, respectively, the motor 6 is reversed (rewinding R), and the timer is set (5STimerSet). The film is rewound by one frame by reversing the motor 6. That is, as described above, in the auto load, five frames are wound up and then one frame is rewound, so that four frames are skipped for convenience. In addition, within 5 seconds after reversing the motor 6, the SSP switch 9
If is turned on (SSP = 0), the flow proceeds to the next step, and if 5 seconds elapse without being turned on (Timer = 0), it is an abnormal situation and the process proceeds to the NG subroutine (NGsub) and the same processing as described above is performed. .. Next, brake the motor 6 (brake B), and after 50 ms, output port M2,
M3 is set to a logic level of "1" or "1" to return to the initial state (r), and the counter value of the C counter for counting the number of films is set to "1" (C ← 1). At this time, since the motor 6 is connected to the rewinding shaft, the film is prevented from idling and loosening in the cartridge.

FIG. 9 is a timing chart showing signals of various parts when the above autoloading subroutine is executed.

In the conventional apparatus, it is usual to skip 3 frames during autoloading, but in this embodiment, 4 frames are skipped. This is because the fourth frame is used as the final exposure frame when rewinding. Of course, three frames may be skipped as in the conventional case, and in this case, the first exposure is started from the fourth frame, and the fifth exposure is the final exposure frame at the time of rewinding.

Next, the film feeding operation will be described with reference to the flow chart of FIG.

FIG. 10 is a flowchart showing the film feeding operation, and FIG. 11 is an explanatory view of the subroutine H and the subroutine L. Note that each of the subroutines H and L in the figure includes one timer and two determination steps as shown in FIGS. 11A and 11B, and the subroutine H sets a predetermined time (TimerSet),
If the SSP switch 9 is turned off within a predetermined time (S
SP = 1), proceed from a to b, and after a predetermined time has passed without being turned off (Timer Set = 0), proceed from a to c. On the contrary, the subroutine L sets for a predetermined time (Timer = 0), and if the SSP switch 9 is turned on within the predetermined time (SSP = 0), the process proceeds from d to e and is not turned on for a predetermined time. When time passes (Timer = 1),
Go from d to f. When these two subroutines are combined, the signal edge can be detected. For example, when the subroutine L1 is connected after the subroutine H1, the falling edge of the SSP signal can be detected.

A flag ΦSR is provided in the microcomputer 28, and ΦSR = 0 is set when the film is pulled out from the cartridge and ΦSR = 1 is set when the film is rewound to the cartridge.

First, the outward route will be described. ΦSR = 0
In this case, the motor 6 is rotated in the normal direction (winding W), and when the trailing edge of the SSP signal is detected in each of the subroutines H1 to H3 and L1 to L3, that is, when the film is fed for three frames, the motor 6 is braked. Apply (brake B). After the lapse of a predetermined timer time TB (for example, 50 milliseconds), the motor 6 is rotated in the reverse direction (rewinding R), and when the falling edge of the SSP signal is detected by the subroutines H4 and L4, that is, the motor is rewound by a predetermined distance. Apply the brake in the open place (Brake B). After the lapse of a predetermined timer time TB, the output port is initialized (initial state r), and the counter value of the C counter is incremented (C ← C + 1).

FIG. 12 is a timing chart in the forward path, where the motor 6 is stopped when three falling edges of the SSP signal are detected, that is, when the film is advanced by three frames. When the film is wound up like this, the film is completely wound up, and finally it is stretched and stopped. When this tension is detected, the motor 6 is rotated in the reverse direction to start rewinding of the film. Next, this tension detection will be described.

FIGS. 13 (a) and 13 (b) show the final stage of film winding with a film of 24 sheets taken. In this figure, the film is not moved, and when the frame is the forward path, it is from left to right. It is shown to move from right to left on the return trip. The SSP signal is shown corresponding to the film.

When the film is taken every other frame in the winding direction and the film is stretched and stopped after shooting the twelfth frame, (1) when the film is stretched in a state where 1.5 frames cannot be wound ( FIG.
(A)) and (2) There are cases where the frame is stretched while 1.5 frames can be wound up but 3 frames cannot be wound up (about 2 and a half frames) (FIG. 13 (b)).

In the case of (1), the film is wound up for another frame and rewound for another frame, and the operation is stopped when the edge b1 of the SSP signal is detected. As a result, an image is captured in the odd frame portion less than one frame, and the thirteenth frame is set to the left of the twelfth frame. After that, it is rewound by 2 frames and photographed.

In the case of (2), the film is rewound by one frame less than the wound length and the film is stopped when the edge b2 of the SSP signal is detected. In this case, no image is captured in the odd frame part, and the thirteenth frame is set to the right of the twelfth frame. In addition, as is apparent from the figure, in the case of (2), it is possible to shoot one frame more than in the case of (1). That is, if the number of frames that can be exposed on the outward path is N, (1)
In case of, you can shoot N frames on the return trip,
In the case of (2), it is possible to shoot (N + 1) frames, which is one frame larger than that.

FIG. 14 shows a time chart when the film is stretched immediately after the film is fed (less than 1.5 frames), and corresponds to the case (1) shown in FIG. 13A. The motor 6 rotates forward and the film is fed, and SS
The P signal changes from the "1" logic level to the "0" logic level, and it is determined that the film is stretched because a predetermined time has passed, and the brake is applied, the motor 6 is reversed, and the brake is applied again. There is.

FIG. 15 shows a time chart in the case where the forward film is wound up after being photographed and is stretched after feeding two frames, and corresponds to FIG. 13 (b). In this case, in the figure, since the SSP signal remains at the logic level "0" even after the lapse of a predetermined time after detecting two pulses, it is determined that the film is stretched, the brake is applied, the motor 6 is rotated in the reverse direction, The brakes are being applied again.

Now, returning to the flowchart of FIG. 10, the description will be continued.

When the film is stretched and stopped, the SSP signal does not change, so that the stretch can be detected. Subroutines H1 to L3 detect for each half frame how many frames have been fed until the film is stretched and stopped.

If the SSP signal does not change in the subroutine H1 and the time is up, the motor 6 is rotated in the reverse direction (rewinding R), and the subroutine L5 is proceeded to, but since the SSP signal is at the "1" logic level, the program proceeds directly to H5 and L6 and SS
Detect the rising edge and falling edge of the P signal. In other words, rewind the length you just wound up and one frame more. The following routines are common and will be described later.

Next, when the time is up at L1, for example, the film is wound up from half frame to 1 frame in the winding S
When the timer time elapses without changing the SP signal, the motor 6 is rotated in the reverse direction (rewinding R), and the subroutines L5, H5,
At L6, the rising edge, falling edge and rising edge of the SSP signal are detected. Similar to the time up at H1, the winding length is increased by one frame and the winding length is increased by one frame.

When the time is up in the subroutine H2, that is, when the film is wound in less than one and a half frames, S
When the timer time has elapsed without changing the SP signal, the motor 6 is rotated in the reverse direction (rewinding R), and the subroutines H7, L5,
The rising edge and the falling edge of the SSP signal are detected twice at H5 and L6. Similar to L1 and H1, rewind by the same length as the wound length and one more frame.

When the timer is timed up in subroutine L2, that is, when the film is wound up for more than one and a half frames and less than two frames and the timer time has elapsed without changing the SSP signal, the motor 6 is rotated in the reverse direction (rewinding R), and the subroutine H is executed.
Heading to 8, but now the SSP signal is a "1" logic level,
H8 passes through as it is, and the fall of the SSP signal is detected at L9. That is, rewind one frame less than the length just wound up.

When the time is up in the subroutine H3, that is, when the timer time has elapsed without changing the SSP signal by winding the film for 2 frames or more and less than 2 frames and a half, the motor 6 is reversely rotated (rewinding R), and the subroutine H8 is executed. , L9, the rising edge of the SSP signal,
Detect falling edge. Rewind by one frame less than the length you just wound up, as you did when you timed up at L2.

When the time is up in the subroutine H3, that is, when the film is wound for more than two and a half frames and less than three frames and the timer time has elapsed without changing the SSP signal, the motor 6 is rotated in the reverse direction (rewinding R), and the subroutine L8 is executed. , H8, L9 to detect the falling edge, rising edge, and falling edge of the SSP signal.
As with L2 and H3, rewind by one frame less than the length you just wound up.

Now, as described above, the motor 6 is rotated in the reverse direction by the six ways of tensioning, and after detecting the SSP signal, first the N
When the counter is H1, L1, and H2, the counter value of the C counter is set as it is, and when the counter is L2, H3, and L3, C is set.
Set the value obtained by adding "1" to the counter value of the counter.
Next, in both cases, the motor 6 is stopped (brake) and time TB
After the lapse of time, the initial state is set and the N counter is decremented (N
← N-1), and set the ΦSR flag to "1" logic level (ΦSR ← 1).

FIG. 16 is a timing chart showing the film rewinding operation on the return path.

In the figure, it can be seen that the motor 6 is reversed by two frames.

By the way, when the film is fed every two frames on the return path, and finally the counter value of the N count becomes "0" (N = 0 in FIG. 10), the film feeding motor is started because all the films have been taken. By reversing (rewinding R), the film is wound into the cartridge. When the rising edge of the SSP signal is repeatedly detected in step X2 and the SF switch is turned off (SF = 1) in the process, that is, when the film is completely wound in the cartridge, the motor 6 is braked (brake B) for a predetermined time. After TB, the output port is returned to the initial state (initial state r), and the ΦSR flag is set to “0” (ΦSR ← 0).

For example, the film winding operation time for one frame conventionally takes 800 milliseconds and the rewinding operation time takes 2800 milliseconds for one shooting, but according to this embodiment, the winding operation time is about 2000.
In milliseconds, the rewinding time is about 2200 milliseconds, and the difference between the hoisting operation time and the rewinding operation time is 20
The time was reduced from 00 milliseconds to 200 milliseconds, and as a result, the feeling of discomfort disappeared.

As described above, according to this embodiment, during the film winding operation, the film is wound for three frames and then rewound for one frame, and the rewinding operation is rewound for two frames. The time difference from the return time can be reduced, and discomfort during use can be eliminated. Further, according to this embodiment, when the film feeding is stopped, the film rewinding shaft is directly connected to the feeding driving system, so that the film can be prevented from loosening in the cartridge. Further, since the film is wound up by 3 frames and rewound by 1 frame during the winding operation, it is possible to prevent the final frame of the film from being cut off at the time of development without being photographed in a state where the film is completely pulled out from the cartridge.

In the present embodiment, when shooting the film in the film winding direction, the film is controlled to be wound up by a predetermined length of two frames and one frame or less in synchronization with the shooting operation, and then rewound by a predetermined length. However, the predetermined length of the film may be changed by changing the speed of the motor or the gear ratio of the power transmission system.

[0054]

As described above, according to the present invention,
When winding the film, the film is wound for two frames and a predetermined length, and then rewound for the required length. At the time of rewinding, the film is rewound by two frames. It is possible to reduce the time difference between and, and it is possible to eliminate discomfort during use. Further, in film feeding, since the feeding is always stopped in the film rewinding direction, the state in which the driving force transmission system up to the film rewinding shaft and the film feeding motor is connected is maintained, so that the film wound in the cartridge loosens. It is possible to eliminate unnecessary film feeding time for removing looseness.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an autoload mechanism according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the periphery of a motor of the film feeding device of the camera of this embodiment.

FIG. 3 is a perspective view showing a film winding and rewinding mechanism.

FIG. 4 is a diagram illustrating the periphery of a motor of the film feeding device.

FIG. 5 is a diagram illustrating the periphery of a motor of the film feeding device.

FIG. 6 is a block diagram of an electric circuit of the film feeding device.

FIG. 7 is a flowchart showing the entire shooting sequence.

FIG. 8 is a flowchart of an auto load subroutine.

FIG. 9 is a timing chart showing signals of various parts when an autoload subroutine is executed.

FIG. 10 is a flowchart showing the film winding and rewinding operations.

FIG. 11 is an explanatory diagram of a subroutine H and a subroutine L.

FIG. 12 is a timing chart at the time of the forward path of film feeding.

FIG. 13 shows the final stage of film winding with a film of 24 shots.

FIG. 14 shows a time chart when the film is stretched immediately after the film is fed (less than 1.5 frames).

FIG. 15 shows a time chart in the case where the film is fed for about 1.5 frames or more and then stretched.

FIG. 16 is a timing chart showing the film rewinding operation on the return path.

[Explanation of symbols]

 5 SF switch 6 Motor 9 SSP switch (sprocket switch) 28 Microcomputer

Claims (2)

[Claims] 1. The rotation of one DC motor is transmitted to a film winding spool and a film rewinding shaft via a gear train, and the DC motor is normally rotated to wind a film.
A film feeding drive system for rewinding the film by reverse rotation is provided, and when the DC motor is rotating forward, transmission to the film rewind shaft is not performed by the planet gears of the film feeding drive system, The film of a camera configured to transmit to the film rewinding shaft by the planetary gear during reverse rotation of the film, and to shoot in both the feeding direction of the winding direction and the feeding direction of the rewinding direction. In the feeding device, in the filming in the winding direction, after winding the film by a predetermined length from two frames, the film is rewound by the predetermined length, and in the filming in the rewinding direction, the film is wound. The film is rewound for 2 frames, and the film is fed from the DC motor in both the filming direction and the filming direction. Camera film feeding apparatus characterized by having a film feeding means for controlling such a state until the return shaft are linked come. 2. The camera according to claim 1, further comprising reversing control means for reversing the film by reversing the film feeding drive system when the film cannot be fed in more than two frames when shooting the film in the film winding direction. Film feeder.