JPS5995520A - Automatic film rewinding device - Google Patents

Abstract

PURPOSE:To prevent a device from starting in a take-up state again and to facilitate the handling of a camera by providing a switch which stores the rewind mode when a film is switched from the take-up mode to the rewind mode. CONSTITUTION:When a motor 1 rotates reversely on the completion of a take-up of the film, a lever 8 rotates in the direction opposite to an arrow A and contacts 12a and 12b pressed by an actuator 10 are made to close a storage switch 12, storing the take-up state. Consequently, even if power source batteries are replaced in the middle, the rewind state is entered again, so double exposure is prevented. Further, the movement of a two-color mode display plate 54 by the rotation of the lever 8 is discriminated through a window 53, so the film state is known and the handling of the camera is facilitated. Further, a camera rear cover is locked by the operation of the lever 8 in the middle of rewinding, so the film is never exposure by mistake.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for electrically winding and rewinding film loaded in a camera, and in particular detects the tension state of the film upon completion of film winding. The invention relates to a device that automatically switches from winding mode to rewinding mode.

Conventionally, in devices that electrically wind and rewind film, particularly in devices such as cameras that automatically detect the completion of film winding and switch control circuits and mechanisms to change the winding mode to rewind mode, When performing a film rewind operation - If the power battery to drive the film rewind mechanism does not have enough power to completely rewind the wooden film, the film rewind operation may be interrupted. If the camera stops or the vibrations applied to the camera temporarily cause a contact failure between the power supply battery and the rewinding circuit, the film rewinding operation also stops midway.

Furthermore, some recent cameras with automated film feeding systems automatically stop film rewinding when film rewinding is complete, and users who are accustomed to this type of camera may When the rewinding of the film stopped midway due to the above-mentioned reasons, I opened the back cover of the camera thinking that the rewinding of the film had been completed, and exposed the undeveloped film that had already been shot, thereby ruining the film that was shot. There was a drawback.

Further, as mentioned above, when the film rewinding operation stops due to insufficient power in the power battery, when the operator replaces the power battery with a new one, the camera is reset and enters the film winding state. Therefore, in this case, there is a drawback that the operator takes a double shot of the film by using the film that has already been shot again, thereby ruining the film.

The present invention has been made in view of the above-mentioned points and to eliminate the above-mentioned drawbacks.The present invention has been made in order to eliminate the above-mentioned drawbacks. If the old power supply battery is replaced with a new one, it will remember that it is in the rewind mode so that it can start from the rewind mode again even after resetting the control circuit of the device. It is an object of the present invention to provide a device that can avoid starting from a winding state by having a switch that allows winding.

Furthermore, another object of the present invention is to eliminate the above-mentioned drawbacks by providing a system for rewinding a film loaded in a camera or the like even if the rewinding operation is stopped when the power supply battery is exhausted during rewinding. In order to indicate that the rewinding mechanism is not malfunctioning and the power supply battery should be replaced, there is a mechanism within the device that indicates that the film is being rewinded, and the direction of rotation is changed from the winding mode to the rewinding mode. It is an object of the present invention to provide a device that directly displays an indication using a clutch that is detected and switched.

Furthermore, another object of the present invention is to eliminate the above-mentioned drawbacks by providing a method for rewinding a film loaded in a camera or other device when the power of the power supply battery is exhausted during rewinding. Even when the machine has stopped, do not open the back cover while the film is in rewind mode, to prevent the operator from thinking that the film has finished rewinding and opening the back cover to expose the film and ruin it. The object of the present invention is to provide a locking device that prevents the user from using the device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automatic film rewinding device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing almost the entire mechanism when the automatic film rewinding device according to the present invention is applied to a camera. 1 is a motor capable of forward and reverse rotation for driving the film winding and rewinding mechanism; 2 is an initial stage gear that rotates together with the shaft 1a of the motor 1; a gear 3 meshes with the gear 2; 5 mesh with gears 3, 4, and 5 in this order.
5 constitutes a gear train for deceleration. Furthermore, this gear 5
A clutch gear 6 is engaged with the clutch gear 6, and the rotational power of the motor 1 is transmitted to the clutch gear 6 via gears 2-5. The planetary gear 9 meshes with the clutch gear 6 and is rotatably supported by a clutch lever 8 with the shaft 7 of the clutch gear 6 as the center of rotation. 1° is an actuator fixed to the opposite side of the clutch lever 8 to which the planetary gear 9 is attached, and when the clutch lever 8 rotates about the shaft 7 in the opposite direction to the arrow A, the actuator rewinds. This is for operating the state memory switch 12. 11 is a planetary gear 9 when the clutch lever 8 rotates about the shaft 7 in the direction of the arrow.
This sprocket gear meshes with the tin rocket 55 and rotates the tin rocket 55 in the winding direction via the shaft 11a. 14 is a planetary gear, and the shaft 11 of the sprocket gear 11
The lever 13 is rotatably supported by a lever 13 that rotates around a, and meshes with the sprocket gear 11. Reference numeral 15 denotes an idler gear, which meshes with the planetary gear 14 when the lever 13 rotates in the direction of arrow B about the shaft 11a. 1
Reference numeral 6 denotes a charge cam which meshes with the idler gear '15, has an eccentric charge cam, lea, in the upper part, and has an indexing cam 16b with a recessed part in the lower part.
Eia, rotates together with 16b. 17 is the shaft 17a
A charge lever that rotates around the center of rotation, and a follower roller 18 rotatably supported in the middle is provided, and this fore roller 18 is supported by a tension spring 19.
Therefore, it is always in strong contact with the charge cam 113a. This fore-roller 18 and charge cam If(a
Due to this relationship, when the charge lever 17 is set by moving in the direction of the arrow with the shaft 17a as the center of rotation, the unillustrated lens and shutter of the camera are set to the initial position where photography is possible in conjunction with this. . Reference numeral 20 denotes a follower lever, which rotates around a shaft 17a, one end of which is always in strong contact with the indexing cam 16b by a spring 21, and the other end of which is a conductive lever that is constantly in contact with a printed wiring board 23. A contact piece 22 is provided. Due to the relationship between the follower lever 20 and the indexing cam 16b, the follower lever 20 rotates about the shaft 17a, and slides the contact piece 22 on the printed wiring board 23 to perform the following operations (not shown). When one revolution of film winding is completed, switches 23a, 23b, and 23c are switched depending on the relationship between printed wiring board 23 and contact piece 22 so as to output a signal to stop the film winding operation. Note that these switches 23a, 23b,
23c is not specifically shown in FIG. 1, and its operation will be specifically explained in FIGS. 4 and 5. 24 is a gear for rewinding the film, and when the clutch lever 8 rotates in the opposite direction of arrow A around the shaft 7, it meshes with the planetary gear 9, the gear 25 meshes with this gear 24, and the gear 26
and gear 27 mesh in this order, resulting in gears 24, 25, .
2ε and 27 constitute a gear train for film winding and tearing. Reference numeral 28 denotes a rewinding gear, which meshes with the gear 27 so that the film rewinding rotational power of the motor 1 is transmitted through gear trains 24, 25, 26, 27, etc. of the rewind system gear train. Furthermore, this rewinding gear 28 has a rewinding fork portion 28a with a slot, and this rewinding fork portion 28a
is engaged with a cartridge (not shown) containing a film. Reference numeral 30 denotes a lever, which rotates around a shaft 29a, on which a sun gear 28 that meshes with the gear 5 is provided, and a planetary gear 31 that meshes with the sun gear 29. There is. This planetary gear 31 is rotatably provided around a shaft 32 fixed to the lever 30, and the lever 30 is rotated around the shaft 28a as indicated by the arrow C.
When the planetary gear 31 rotates in the direction shown in FIG. 1, the planetary gear 31 meshes with a spool gear 33a provided at the end of a spool 33 for winding a film (not shown), thereby transmitting the winding rotational power of the motor 1. Reference numeral 35 designates a shaft of the autoloading film guide 34, and a spring 36 provided on the shaft always acts to press a roller portion 37 against the rubber portion 33b of the spool 33. 40 is a shaft provided on the back cover 42 described below, and the shaft of the spring 41 for generating the pressing force of the roller 38 pressed against the rubber portion 33b of the spool 33 at the tip of the film guide 39 is also a shaft of the film guide. It also serves as the shaft 40 of 38. 47 is the aperture of the camera, and an outer rail 46 and an inner rail 4 are placed before and after this end.
5 is arranged, and a film detection button 44 is arranged between both rails 45.4B, and this film detection button 44 presses the cut of the film presence/absence detection switch 43 when the film (not shown) runs out. The switch 43 is opened. In addition, gear 3.
4.5.26, the clutch gear 6 and the planetary gear 9 are two-stage gears having a large diameter gear and a small diameter gear as shown in the figure.

Reference numeral 12 denotes a rewinding state memory switch, and when the film is in the rewinding state, the lever 8 is rotated around the shaft 7 at an arrow mark A.
Since the actuator 10 also moves in the same direction, the contact piece 12a is pushed toward the contact piece 12b, and both liquid pieces 12a and 12b are brought into contact and closed. A two-color mode display plate 54 is disposed at the upper end of the actuator 10, and the cover 5 displays one of the two color mode display plates 54 as part of the exterior of the camera.
Visual confirmation is possible through a transparent window 53 provided in 2. 5e uses the manual rewind button to close the camera cover 5
A manual rewind switch 80 for rewinding the film mid-way through winding is closed when the switch is pushed.

FIG. 2 is a partial plan view showing a film winding state of the automatic film rewinding device according to the present invention, and FIG. 3 is a partial plan view showing the film rewinding state. In FIGS. 2 and 3, 6 is a clutch gear, 7 is a shaft, 8 is a clutch lever, 19 is a planetary gear, IO is an actuator, 11
is a sprocket gear, 12 is a rewind state memory switch,
13 is a lever, 14 is a planetary gear, 15 is an idler gear,
Reference numeral 24 is a rewinding gear, and 55 is a Suzuro Kent, the construction of which is as shown in FIG.

Reference numeral 48 denotes an oval-shaped lever, which is supported by a shaft 48 at a bent portion, and is rotatable around the shaft 48 . This lever 48 is always operated by the action of a spring 50.
A force is applied in the clockwise direction and the stop member 51 positions the nail in the stomp position unless other external forces are applied.

One end 48b of this lever 48 is a part that is actuated by engagement of the actuator 10, and is a part that is actuated by engagement of the actuator 10.
When rotated clockwise along with the actuator 1° around the shaft 7, one end 48b of <-48
and the actuator 10 are engaged, and the lever 48 is moved to the shaft 4.
It rotates counterclockwise around the rotation center 9 against the force of the spring 5o. 48a is a claw provided at the other end of the lever 48; 42 is the back cover of the camera, which is rotatable about a shaft 42b in the direction of the arrow in the figure; a locking claw 42a is provided on the inner side of the claw 48a; . As mentioned above, during rewinding of the film, the pawl 48a and the lever 48 rotate counterclockwise about the shaft 49, so that the pawl 48a and the locking pawl 42a rotate as shown in FIG. is locked. As a result, the back cover 42 will not open even if force is applied in the direction of the arrow shown in the figure.

Fig. 4 is a circuit diagram for driving the mechanism of the automatic film rewinding device according to the present invention, and Fig. 85 is a circuit diagram of a more detailed embodiment of a part of the circuit diagram shown in Fig. 4. It is.

In the examples shown in FIGS. 4 and 5, 70 is a power source battery, 71
．． 72, 73, and 74 are transistors, and these transistors constitute a bridge. Reference numeral 1 denotes a film winding and rewinding motor, which is connected between the intermediate points of this transistor bridge. When winding the film, power is applied in the order of transistor 71 -> motor 1 -> transistor 74, and motor 1 rotates in the forward direction. When rewinding the film, power is applied in order of transistor 72 -> motor 1 -> transistor 73, and motor 1 rotates in reverse. The switch 23a is a shank.
This is a switch that closes when control ends, and turns on the power to the motor drive control circuit 76. Mata, switch 23a
The film is opened when a portion of the film has been wound. Switch 23b connected to the input and output terminals of motor l
is opened when the shutter control ends to enable electricity to be applied to the motor 1, and is closed when winding of a portion of the film is completed to short-circuit the input and output ends of the motor 1 and brake the winding operation. multiply. 7Eia is a well-known timer circuit, and 78b is a well-known switch interface that determines the states of the rewind state storage switch 12 and presence/absence detection switch 43 or manual rewind start switch 60. 76C is a timer circuit 76
This is a forward/reverse rotation determination circuit that determines the states of the motor 1 and the switch interface 78b and determines whether to energize the motor 1 in the forward rotation direction or in the reverse rotation direction. The output of this forward rotation/reverse rotation determination circuit 78c is the output of each transistor 71, ?
It is wired to be applied to the base side of 2.73.74. Note that these timer circuits 76c and switches
Interface 76b and forward/reverse rotation determination circuit 7ec
A motor drive control circuit 76 is constructed from these. 12
is the above-mentioned rewind state memory switch, which is closed when film rewinding starts, and the next switch is closed.

This is a switch that opens when the film is wound.

Reference numeral 43 designates the film presence/absence detection switch, which is closed when the film is on the rail 45 and 48 surface provided above and below the aperture 47 of the camera shown in FIG. .46 It is a switch that opens when it is no longer on the surface. Reference numeral 80 denotes the manual rewind start switch, which is manually closed by the camera operator when rewinding the film in the middle of the film. The rewind state memory switch 12 and the film presence/absence detection switch 43 are connected in series, and are connected in parallel with the manual rewind switch 6°. Reference numeral 86 denotes a pull-up resistor for providing a "high" level signal to the input terminal 8o when these switches 12, 43, and 8o are open. Reference numeral 85 denotes 15 transistors with common emitters, which are inputted to the output signal base side of the inverter 8o, and the collector side of which is connected to the capacitor 75, which has one end grounded, the resistor 87, and the input side of the inverter 82. Note that a circuit in which a resistor 92 and a switch 23c are connected in series is connected in parallel to this capacitor 75. Switch 23c has the same operation as switch 23b. 83 is N
An AND gate is used to input the output signal of the inverter 81 and the inverter 82 to the in, respectively. The output signal of this NAND gate 83 is passed through an in/hake 84 to a'a' of the forward rotation/reverse rotation determination circuit 78c.
It is also output to the a terminal of the forward/reverse rotation determination circuit 76c via the inverter 84, a transistor 90 whose emitter is grounded, and a current control resistor 91 connected to the collector side of this transistor 90. Ru. on the other hand,
The output signal of the NAND gate 83 is directly outputted to the b' terminal of the forward/reverse rotation determination circuit 76c, and is also transmitted through a transistor 88 whose emitter is grounded and a current limiting resistor 89 connected to the collector side of this transistor 88. The normal rotation φ reverse rotation determination circuit 78c is outputted to the b terminal. In addition,
Terminals a, a', b, -b' of forward/reverse rotation determination circuit 76c
Is it a transistor? 1, 74, 72, and 73 are connected to the base side, respectively.

Next, an explanation will be given of the operation when the automatic film rewinding device according to the present invention is applied to a camera.

In the examples shown in Figures S1 to 3, when a film (not shown) is loaded into the camera, depending on the film winding mode,
The motor 1 rotates together with the gear 2 through the shaft 1a in the direction of the arrow shown in the figure, that is, in the normal rotation direction.

As the gear 2 rotates, the rotational power of the motor 1 is transmitted to the clutch gear 6 via a reduction gear train 3.4.5 that rotates in the direction of the arrow in the figure. Since the clutch gear 6 rotates in the direction of the arrow shown in the figure, the clutch gear /<-8 rotates in the direction of the arrow A around the shaft 7 to rotate the planetary gear 9 in the direction of the subrocket 7).
mesh with gear 11. The planetary gear 9 and the sprocket gear 11 rotate in the direction of the arrow shown in the figure.
1 rotates the sprocket 55 in the same direction via the shaft 1 ja, thereby feeding the film (not shown) from the left side to the right side of the spool 33. On the other hand, the sun gear 29 meshing with the gear 5 rotates in the direction of the arrow shown in the figure, and thereby the lever 30 rotates in the direction of the arrow C about the shaft 29a, thereby meshing the planetary gear 31 and the spool gear 33a. The rotation of the sun gear 29 also rotates the planetary gear 31 in the direction of the arrow in the figure, and together with this, the spool gear 33a also rotates in the direction of the arrow in the figure, causing the spool 33 to rotate in the same direction as the spool gear 33a. As a result, the film (not shown) sent via the sprocket 55 is automatically and securely wound onto the spool 33 by the action of the 511 portion 33b on the spool 33, the rollers 38, and the rollers 37. The construction and operation of this winding section is described in detail in Japanese Patent Application No. 513-58047, which was previously proposed by the applicant of the present invention, and therefore will not be explained in further detail here. On the other hand,
The rotational force transmitted to the sprocket gear 11 feeds a film (not shown), and at the same time rotates the lever 13 in the direction of arrow B about the shaft 11a, causing the planetary gear 14 to mesh with the idler gear 15. Therefore, sprocket gear 1
1 is transmitted to the charge gear 16 via the MfM gear 14 and the idler gear 15, which rotate in the direction of the arrow shown in the figure, and the charge gear 16 rotates in the direction of the arrow shown in unity with the charge cam lea and the indexing cam 18b. . By one rotation of the charge cam 18a, the follower roller 1
8 is rotated together with the charge lever 17 around the shaft 17a in the direction indicated by the arrow against the force of the spring 19, and then moves in the direction opposite to the direction indicated by the arrow to return to the initial position. By moving the charge lever 17 in the direction of the arrow, the lens and shutter of an automatic focusing device (not shown) that are engaged with the lever 17 are moved and set to the initial state for photographing. Further, the follower lever 20, whose one end is in contact with the indexing cam 1B, rotates in the direction of arrow E about the shaft 17a against the force of the spring 21, and moves the contact piece 22 over the printed wiring board 23. After one more rotation, index the cam 16b to one end of the follower lever 20.
The following switches 23a, 23b, and 23c to transmit a signal indicating the completion of film winding to the following circuit, and short-circuit the input terminal of the motor 1 to apply a brake to the rotation of the motor 1 and stop the winding operation.

Furthermore, the follower lever 20 is temporarily activated by a lever (not shown) that operates when the control of the shutter (not shown) is completed.
is rotated in the direction of arrow E about the shaft 17a, and the contact piece 22 moves, and the contact piece 22 and the printed wiring board 2
A switch corresponding to the switch 23b shown below consisting of 3 is opened, and the input end of the motor 1 is in a non-short-circuited state, and a switch 23a shown below is closed, the power is turned on, and the next film winding operation begins.

After the film (not shown) is tightly wound around the spool 33-H by the above operation, the film (not shown) is
Rather than being fed by the sprocket 55 as mentioned above, the rotation of the spool 33 pulls the film (not shown) out of the cartridge and winds it onto the spool 33 in portions. When the control of the shutter (not shown) is completed, the motor 1 rotates in the direction of the arrow along with the gear 2 via the shaft 1a by the same operation as described above.

This rotational force is transmitted to the spool gear 33a via the gear 3.4.5, the sun keyer 29, and the planetary gear 31.
The spool 33 rotates in a film winding direction (not shown), that is, in the direction of the arrow. As a result, a film (not shown) is wound onto the spool 33. At this time, as the film (not shown) runs, the sprocket 55 is also rotated in the direction of the arrow shown. The rotational force of the sprocket 55 is transmitted to the sprocket gear 11 via the shaft 11a, and the sprocket gear 11 rotates in the direction of the arrow shown in the figure. The rotational speed of this sprocket gear 11 is set to be faster than the rotational speed of the 'M star gear which rotates from the motor 1 through the gear 2, the reduction gear train 3, 4.5 and the clutch gear 6 in the direction of the arrow in the figure. Since the gear ratio is set to , the clutch gear 9 only rotates while being rejected by the sprocket gear 11. The rotational force of this sprocket gear 11 is transmitted to the charge gear 16 via the planetary gear 14 and the idler gear 15 as described above, and the charge lever 17 is moved in the direction of the arrow by the charge cam IEia rotating together with the charge lever 17 via the follower roller 18. Initial settings for the lens and shutter (not shown) are made by moving in the direction shown in FIG. Further, when the indexing cam 16b rotates once, the contact piece 22 is moved through the follower/<-20 as described above.
moves on the printed wiring board 23, returns to the position before winding the film, and the contact piece 22 and the printed wiring board 23
When the power switch 23a is opened and the switch 23b is closed due to the relationship between Stop. During film winding operation, as shown in FIG. 2, the actuator 10 is rotated around the shaft 7, and a force is applied in the counterclockwise direction along with the clutch lever 8 to move the lever 48 as shown above. It does not engage with one end portion 48b.

Therefore, the restoring force of only the lever 50 is applied to the lever 48, and a force is applied in the clockwise direction about the shaft 48, and the lever 48 is positioned at the stop position by the stop member 51, so that the claw 48a and the back cover The locking claw 42a of 42 does not lock. At this time, of course, the contact piece of the rewind state memory switch 12 is not pressed by the actuator 10, so the switch 12 is open. Also, the first
The colors on the left side of the two-color mode display plate 54 are observed through the transparent window 53 in the figure, as shown by the dashed line, and the film is shown to be in the winding state.

Next, when the winding of the film is completed and the film (not shown) is in a stretched state, the rotational force of the motor 1 cannot resist this force and stops rotating. The spool 33 and the sprocket 55 stop moving, and the charge cam 18a and the indexing cam 16t also stop moving, so the contact piece 22 also does not move and the winding of the film is not completed even after the predetermined timer elapses one hour. As described below, the motor 1 is controlled by the action of the control circuit 76 shown in FIG.
is reversed and automatically rewinds the film (not shown) onto a sprocket (not shown). When the motor l rotates in the opposite direction to the arrow direction shown in the figure together with the gear 2 through the shaft 1a, this gear 2
The reduction gear train 3.4.5, the clutch gear 6, and the sun gear 28, which are interlocked with each other, also rotate in the direction opposite to the arrow shown in the figure.

The rotational force of the sun gear 29 rotates the lever 30 about the shaft 28a in the opposite direction of the arrow C, so that the planetary gear 31 also moves together with the lever 30, thereby breaking the meshing between the planetary gear 31 and the spool gear 33a. Therefore, the spool gear 33a and the spool 33 attached to it
is in a state of free rotation. Further, due to the rotation of the clutch gear 6 in the direction opposite to the arrow shown in the figure, the clutch lever 8 is moved toward the shaft 7.
The planetary gear 9 and the actuator 10 rotate together in the direction opposite to the direction of the arrow FljA, with the planetary gear 9 disengaged from the sprocket gear 11 and engaged with the gear 24.

At this time, the actuator 10 moves the contact piece 12a of the rewind state memory switch 12 to the contact piece 1 as shown in FIG.
2b side, and bring both wave pieces 12a and 12b into contact to close the rewinding state memory switch 12. Also,
Similarly, the actuator 10 is connected to one end 48 of the lever 48.
b, and rotates the lever 48 with the shaft 48 as the center of rotation.
By rotating the claw 48b of the lever 48 counterclockwise against the force of the screw 50,
It is locked by the locking claw 42a of No.2. Therefore, in the film rewinding mode, the spine M42 does not rotate and does not open even if it is pulled in the direction of the arrow in the figure with the shaft 42b as the center of rotation due to the locking between the claw 48b and the locking claw 42a. Furthermore, the first
In the figure, this movement of the actuator 10 moves the two-color mode display board 54, so when the two-color mode display board 54 is visually observed through the transparent window 53, the two colors not shown by the dashed line It can be seen that another color is displayed on the mode display plate 54, thereby identifying that the film is in the rewind mode.

On the other hand, since the planetary gear 9 meshing with the clutch gear 6 rotates in the direction opposite to the arrow shown in the figure, the gear trains 24, 25, 26.
27 rotates in the direction of the arrow in the figure. Since the rewind gear 28 meshing with the gear 27 also rotates in the direction of the arrow shown in the figure, the rewind fork portion 28a provided on this gear 28 also rotates in the same direction and engages with the rewind fork portion 28a. A film (not shown) is rewound from the spool 33 via a sprocket 55 onto the core of a cartridge (not shown). At the start of rewinding the film, the sprocket ( ) 55 rotates in the direction opposite to the arrow shown in the figure as the film runs in the rewinding direction (not shown), so this rotational force is also transmitted to the shaft 11a and rotates the shaft 11a. Center, and <-13 with arrow B
The sprocket 55 is moved in the opposite direction to disengage the planetary gear L4 and the idler gear 15, thereby allowing the sprocket 55 to rotate freely. Therefore, the film (not shown) is rewound onto the cartridge (not shown) by the rotational force of the rewind gear 28 alone. Note that even if the electric power of the power supply battery (not shown) that drives the motor 1 is consumed and the motor 1 stops in the middle of rewinding the film, making it impossible to rewind the film, the above-mentioned 1 rewind state is maintained. . That is, since the actuator 10 does not move, the two-color mode display board continues to display the film rewind mode through the transparent window 53, and the rewind state memory switch 12 remains closed. Since the locking claw 42a of the back cover is locked with the claw 48a of the lever 48, the back cover 42 cannot be opened. Therefore, in this case, the camera operator can see the mode color of the two-color mode display plate 54 through the transparent window 53, thereby knowing that even if the rewinding mechanism has stopped operating, the film is still running. You can confirm that it is in rewind mode and know that you need to replace the power battery with a new one. Since the rewinding state memory switch 12 remains closed as described below, even if the power supply battery is replaced, the film can be started from the rewinding state again and the film can be rewound.

In this way, when the entire film (not shown) is rewound, the inner rail 45 and outer rail 4 of the aperture 47
When the film detection button 44 located between 6 and 6 runs out of film (not shown), the film presence/absence detection is activated.
3 is no longer pressed, both contact pieces of the film presence/absence detection switch 43 are separated, and the film presence/absence detection switch 43 is opened. This film presence/absence detection switch 43
When the motor drive control circuit 76 shown in FIG. 4 is opened, the motor drive control circuit 76 shown in FIG. 4 switches again from the film rewinding state to the film winding state. This causes motor 1 to move to shaft 1.
The camera is rotated normally in the direction of the arrow shown in the figure together with the gear 2 via the gear 2, and the clutch levers 8, 30, 13, etc. are all rotated toward the winding side as shown above, and the camera enters the film winding state. As a result, when the indexing cam 18b is moved by the amount that the film winding is not yet completed, the winding mechanism rotates in the winding direction in the same manner as described above, and the motor 1 is stopped when the indexing is completed. As a result, the camera enters the state shown in FIGS. 1 and 2, and the two-color mode display plate 54 displays the film winding mode in the same way as above, and the camera back 42 can be opened. When the camera operator wishes to rewind the film (not shown) before the film winding is completed, the camera operator presses the manual rewind button 56 with his or her finger and closes the manual rewind slot 0 at the same time. , the lever 20 is actuated by a mechanism not shown to switch the contact piece 22. This can be done by simultaneously pressing the normal shutter button, and by causing the shutter (not shown) to complete its travel and actuating the trigger 8-20.

The specific operation is as follows.

Next, with reference to FIGS. 4 and 5, the operation of the circuit for driving the automatic film rewinding device according to the present invention shown in FIGS. 1 to 3 will be explained. When the camera is loaded with film and starts winding the film, the rewind state memory switch 12 is opened, and the film rewind detection switch 4 is opened.
3 is closed, and manual rewind start switch CO is opened. When the power of the power supply battery 70 is supplied to the motor drive control circuit 76 by closing the switch 23a, the input of the inverter 80 is pulled up to the "high" level by the pull-up resistor 8B. The output signal of 80 becomes a "low" level. Therefore,
Switch interface? Since the transistor 85 of the timer circuit 76a inputs this output signal from Bb,
Transistor 85 becomes non-conductive and switch 23
Since the switch 23c is opened in synchronization with a +, the capacitor 75 starts charging via the resistor 87, and the timer circuit 78a starts operating.

Since the input signal of the inverter 81 is the output signal of the inverter 80, the input signal of the "low" level is input, and the output signal of the inverter 81 becomes the "no\\" level, so that the output signal from the switch interface 78b is output from the switch interface 78b. This signal is output to the rotation/reverse rotation i/- constant circuit 78c. On the other hand, the input signal to the inverter 82 is the charging voltage of the capacitor 75.
Since the charging voltage of capacitor 75 does not exceed the threshold voltage of
Therefore, from the timer circuit 7Ba to the forward/reverse rotation determination circuit? 8
This signal is output to c. ? The input signal of the 1AND gate 83 is the output signal of the inverter 81 and the output signal of the inverter 82.
．． It inputs the "high" level output signal of 82 and outputs a power signal. Therefore, this "low level" signal is applied to the terminal b' and the base side of the transistor 88, so that the transistor 88 becomes non-conductive.

Further, since this output signal is given as an input signal to the inverter 84, the input signal 84 outputs a signal at the "/\I" level. This "NO\I" level signal is at terminal a.
' and the base side of transistor 90, transistor 80 becomes conductive. As a result, transistor 71 becomes conductive via resistor 91 and transistor 90, and transistor 74 also becomes conductive via terminal a'. On the other hand, since the terminal b' is in the "low" level state and the terminal b' is in the non-conducting state, the transistor 72
．． 73 is in a non-conductive state.

As described above, the switch 23b is opened when the shunter control is completed, so the closed circuit of the power supply battery 70 → transistor 71 → Mork 1 → transistor 74 is energized, and the motor 1 is energized and rotates in the forward direction. Wind the film so that it After that, when the film is wound up by one frame, the switch 23b is closed and the input terminals of the motor 1 are short-circuited, and the switch 23a is opened, so that the motor 1 stops rotating and the film winding operation is stopped. .

Further, in synchronization with this, the switch 23c is closed, and the charge in the capacitor 75 is discharged via the resistor 92 and the switch 23c. In this way, when winding of a portion of the film is completed, the switch 23a is opened, the switches 23b and 23c are closed, and when the shutter control is completed,
Switch 23a is closed, and switches 23b and 23c are closed.
will be opened. These switches 23a, 23b
, 23c is composed of the contact piece 22 shown in FIG. The lever 20 rotates about the shaft 17a in the opposite direction of the arrow E, and together with this, the contact piece 22 slides on the printed wiring board 23, and the switches 23a, 23b, 23
c is operated as described above, and when the shank control is completed, a lever (not shown) acts on the follower lever 20 to rotate the follower lever -20 in the direction of arrow E about the shaft 17a. As a result, the switches 23a, 23b, and 23c are operated as described above, and the subsequent film winding is performed as follows.
Due to the relationship between <-20 and the indexing cam 18b, the states of the switches 23a and 23b are maintained. In addition,
Detailed configuration diagrams of the switches 23a, 23b, and 23c are omitted for simplicity. Note that the charging time required for the threshold voltage of the inverter 82 to reach the capacitor 75 via the resistor 87 is set to be longer than the time required to wind up one frame of film. Since the switch 23a is opened, the forward rotation/reverse rotation determination circuit 78 of the motor drive control circuit 76
The terminals a' and b' of c become "low" level, and the terminals a,
Since transistors 88.9o become non-conductive, transistors 71.72.b become non-conductive.
73 and 74 are all in a non-conductive state, the input and output terminals of the motor 1 are short-circuited by the switch 23b, and the motor 1 is braked and stopped. All film winding is completed. When the film is stretched, switch 2
3a is closed, and the switches 23b and 23c remain open. Therefore, the capacitor 75 continues to be charged via the resistor 87 during the winding operation described above. This charged voltage further increases to the inverter 82.
exceeds the threshold voltage of As a result, the input 82 outputs a "low" label signal to the NAND gate 83. The NAND gate 83 to which this signal is input is "high"
A circuit that determines whether the level signal is forward or reverse rotation? Output to b' terminal of Eic. Furthermore, since this signal is also applied to the base side of transistor 88, transistor 88 becomes conductive. On the other hand, the inverter 84 to which this "high" level signal is input also outputs a "low" level signal to the terminal a', and furthermore, this signal is given to the base side of the transistor 8o, so the transistor 3o is It becomes a non-conducting state. Therefore, transistor 72 becomes conductive via resistor 89 and transistor 88, and transistor 73 becomes conductive.
Since the "high" level signal is also input to the base side, it becomes conductive. However, since the terminal a is in a non-conducting state, the transistor 71 is in a non-conducting state, and the transistor 74, whose base side receives a "low" level signal from the terminal a', is in a non-conducting state. Therefore, power supply battery 70 → transistor 72 → motor l → transistor 7
The open/open circuit of 3 is energized. Here, the important word motor 1
Since the direction of the current flowing through the film is opposite to the direction of film winding and sowing, the motor 1 rotates in the opposite direction. As a result, the film is rewound, but as described above with reference to FIGS. 1 to 3, the rewind state memory switch 12 is closed at the time when the film starts to be rewound. Film detection switch 43
is closed, the input side of the inverter 80 is grounded, and a "high" level signal is output from it. This "high" level signal is input to the inverter 81,
From this, a "low" level signal is output and given as an input signal to the NAND gate. Meanwhile, to the inn - evening 8
The transistor 85, which inputs the "high" level output signal of 0 to the base side, becomes conductive, and through this,
The charge in the capacitor 75 is discharged. Therefore, the charging voltage of capacitor 75 does not exceed the threshold voltage of inverter 82, so inverter 82 outputs a "high" level signal to NAND gate 83. NAND gate 83
is the “low” level output signal of the inverter 81 and the input/output signal of the inverter 81.
Since the "high" level output signal of the heater 82 is inputted, a "high" level signal is output, and there is no change in the rewinding state of the film, which is the same as the operation described above. Power battery 70
Even if the power supply battery 70 was removed because the power was consumed and the circuit became inoperable, the relationship between the indexing cam 16b and the follower gear 20 in FIG. 1 remained as it was in the middle of winding. Therefore, the switch 23a remains closed and the switches 23b and 23c remain open. Furthermore, since the rewinding state memory switch 12 remains closed, even if a new power supply battery 70 is replaced, the rewinding state before replacement will be maintained and the film will be read again in the same manner as described above. Rewinding is performed. When the rewinding of the film is completed, the film presence/absence detection switch 43 is opened and the inverter 8 is opened.
A “high” level signal is input to o by a pull-up resistor 86. Therefore, the input terminal 80 outputs a "low" level signal, and the input terminal 81 and the transistor 85
give to Inverter 81 receiving this signal outputs a "high" level signal, while transistor 85 becomes non-conductive and capacitor 75 is charged via resistor 87. Since this charging voltage does not exceed the threshold voltage of the inverter 82, the inverter 82 outputs a "high" level signal. The NAND gate 83 inputting the "high" level from both inverters 81 and 82 is "
A low level signal is output.This signal is sent to the forward/reverse rotation determination circuit 7 through the inverter 84 in the same way as above.
A "high" level signal is output to the 6c terminal a', and the resistor 9
The terminal a is made conductive through the transistor 90 and the transistor 90. Therefore, transistors 71 and 74 become conductive, and
The closed circuit of power supply battery 70→transistor 71→motor 1→transistor 74 is energized, and as the motor 1 rotates in the forward direction, the remaining winding operation is performed. At the end of this winding operation, the rewinding state memory switch 12 is opened, the switch 23a is also opened, and the switches 23b and 23c are opened.
is closed and stops the winding operation.

Furthermore, even if the camera operator manually closes the manual rewind start switch 60 during film winding, the input side of the inverter 80 is grounded in the same way as described above, so the same operation as described above can be used to rewind the film. A rewinding operation is performed.

In addition, in FIG. 4, when the switch 23b is closed, the transistors 71, 72, .
In order to prevent damage to 73 and 74, it is desirable to appropriately interpose a current control resistor.

Further, the discharge switch 23c and the resistor 92 are not particularly required. This is because the charge stored in the capacitor 75 is discharged through other circuits.

As explained above, by having a switch that mechanically memorizes the rewinding state, even if the power supply battery is exhausted during film rewinding and the power to the motor control circuit is cut off, the rewinding state can be restarted. By replacing the correct battery, the film rewind state is memorized, so the camera's rewind mechanism starts from the film rewind state, preventing the camera operator from accidentally taking double shots of the film. It can be prevented.

Moreover, by directly displaying which mode is selected using a clutch that detects the rotational direction of the motor and automatically switches from film winding mode to rewinding mode, the display can be performed using a reliable and inexpensive mechanism. . This display makes it clear whether the camera's automatic winding and rewinding mechanisms have stopped when the film has been rewound, or whether they have stopped while the film is being rewound, so that the camera operator is not confused. This makes it easy to handle the camera.

Similarly, by operating the clutch member as described above, even if the power battery runs out and the rewind motor stops during film rewinding, the camera operator can still rewind the film. Even if you try to open the back cover by misunderstanding that the camera is open, the locking member will lock it, eliminating the need to worry about exposing the film that has already been photographed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing almost the entire mechanism when the automatic film rewinding device according to the present invention is applied to a camera, and FIG. 2 is a perspective view showing the film winding state of the automatic film rewinding device according to the present invention. FIG. 3 is a partial plan view showing the rewinding state of the film, FIG. 4 is a circuit diagram for driving the mechanism of the automatic film rewinding device according to the present invention, and FIG. 1 is a more detailed circuit diagram of a part of the circuit diagram shown in FIG. 1; Motor 7; Shaft 8; Lever 12; Actuator 13.30; Lever 12: Rewinding state memory switches 23a, 23b, 23c; Switch 28;
Rewinding gear 28a; rewinding fork portion 33 varnish spool 42; back cover 42a; locking claw 48; front/height 48a, claw 54; two-color mode display board Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] In a camera having a device for electric film winding and rewinding using a motor, the camera has a switch that remembers that the film is in the film rewinding mode when the film is automatically switched from the film winding mode to the rewinding mode. An automatic film rewinding device characterized by: