JPS5997125A - Winding and rewinding device for camera - Google Patents

Abstract

PURPOSE:To prevent the damage of a film and to start rewinding the film exactly by transmitting the revolution of a motor only to the spool to wind the film and starting the reverse run of the motor by the output of a timer circuit which is set at the time longer than the time when film is wound for one frame. CONSTITUTION:A timer circuit 76a is set longer than the time required for winding a film for one frame. A motor 1 is run forward by the winding mode for the film, and the film is automatically and securely wound on a spool 33 by the effect of the spool 33. The spool 33 and a sprocket 55 stop moving upon completion of the full winding of the film. The winding of the film is not completed even if the preset timer time elapses and therefore the motor 1 is run reversely by the operation of a control circuit 76, by which the film is automatically rewound.

Description

[Detailed description of the invention] The present invention relates to a winding and rewinding device for a camera.

2. Description of the Related Art Conventionally, it is well known that in a camera winding/rewinding device, when the end of the film is detected, the direction of rotation of the motor is switched from normal rotation to reverse rotation to automatically start rewinding the film. For example, in a conventional automatic film rewinding device, a sprocket driven by a motor winds the film frame by frame during a predetermined winding time, and when the film is wound up to the end, this end is connected to the cartridge shaft. Since the film is not wound during the predetermined winding time, this is detected by a timer circuit set to a time longer than the predetermined winding time, and this detection signal is used to control the rotation of the motor. The film is rewound by reversing it. However, in such a rewinding device, when the film is tightly wound around the cartridge shaft, the timer circuit is prevented from operating during film winding, that is, one frame is wound within the set time of the timer circuit. If the driving force of the sprocket is set large so that all frames are taken, the film will stop and the sprocket will continue to rotate in the forward direction, that is, wind the film, until the timer circuit is activated. The disadvantage is that the perforations of the sprocket are damaged by the gears of the sprocket. Furthermore, in this case, even though the film has stopped, the sprocket rotates and the winding operation is completed, and the timer circuit does not operate, so the rewind mechanism does not operate. As a result, the last frame is photographed over and over again, broken film chips can get into the camera mechanism and optical system, causing malfunctions, and in some cases, rewinding cannot be performed. There are drawbacks.

Other rewind devices include a rotating body that rotates in conjunction with the running of the film, and generate a film running signal in synchronization with the rotation of this rotating body, and this film running signal determines the winding time for one frame. The end of the film is detected by resetting a shorter timer circuit, but in such a device, the provision of the rotating body complicates the configuration of the camera body, and furthermore, the end of the film is detected regardless of the phase at which the film stops. Not only is a differentiator circuit required to generate the film run signal, but if a film perforation breaks just before winding is complete, a timer circuit will cause the winding function to fail before the set time elapses. The drawback was that the film was shot twice when it was almost completed.

In view of the above drawbacks of the conventional example, an object of the present invention is to wind the film by transmitting the rotation of the motor only to the spool, and to detect the end of the film in the winding time of one frame of film. It is an object of the present invention to provide a camera winding/rewinding device which uses a timer circuit set to a longer time and starts rewinding the film by rotating a motor in the reverse direction based on the detection signal.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a camera winding and 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 whole of this embodiment. 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 gear 2; 5 and 3 mesh with each other in this order, and gears 3 and 4.5 form a gear train for deceleration. Furthermore, a clutch gear 6 meshes with this gear 5, and the rotational power of the motor 1 is transmitted to the clutch gear 6 via gears 2-5. Planetary gear 9 is clutch gear 6
The clutch lever 8 is rotatably supported by a clutch lever 8 with the shaft 7 of the clutch gear 6 as the center of rotation. 1o 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 arrow A, it is in the rewinding state. This is for activating the memory switch 12. A sprocket gear 11 meshes with the planetary gear 9 when the clutch lever 8 rotates about the shaft 7 in the direction indicated by the arrow, and is used to rotate the sprocket 55 in the winding direction via the shaft 11a. Reference numeral 14 denotes a planetary gear, which is rotatably supported by a lever 13 that rotates around the shaft 11a of the sprocket gear 11, and meshes with the sprocket gear 11. 15 is the idler gear, lever 1
3 meshes with the planetary gear 14 when it rotates in the direction of arrow B 4- with the shaft 11a as the center of rotation. Reference numeral 16 denotes a charge gear which meshes with the idler gear 15, has an eccentric charge cam 16a at its upper part, and has an indexing cam 16b having four parts at its lower part, these cams 16a, 16
Rotates together with b. Reference numeral 17 denotes a charge lever that rotates around a shaft 17a, and a follower roller 18 that is rotatably supported is provided in the middle of the charge lever.
It is strongly abutted against the charge cam 16a. Due to the relationship between the fore-roller 18 and the charge cam 16a, when the charge lever 17 is set by moving in the direction of the arrow around the shaft 17a, the lens and shutter (not shown) of the camera are moved in conjunction with this. The camera is set to the initial position where shooting is possible. Reference numeral 20 denotes a follower lever, which rotates around a shaft 17a. One end of this lever is always in strong contact with the indexing cam 16b by a spring 21, and the other end is a conductive lever that is constantly in contact with a printed wiring board 23. Sex piece 22
is provided. Due to the relationship between the follower lever 20 and the indexing cam 16b, the follower lever 201d
By rotating the shaft 17a as the rotation center, the contact piece 22 is slid on the printed wiring board 23, and when the winding of the film (not shown) completes one rotation as shown below, a signal is sent to stop the film winding operation. The switches 23a, 23b, and 23c are changed according to the relationship between the printed wiring board 23 and the contact piece 22 so as to output . In addition, these switches 23a, 23b, 23c fd
Although it is not specifically shown in FIG. 1, the operation will be explained in detail with reference to 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 shaft 7, it meshes with planetary gear 9, gear 25 meshes with this gear 24, and 26 and gear 27
and gears 24, 25, 26, 27 mesh in this order.
This constitutes the gear train for the film rewind system. 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 the 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 engages with a cartridge (not shown) that accommodates a film. Reference numeral 30 denotes a reverte, which rotates around a shaft 29a as the center of rotation, and this shaft 2
A sun gear 29 meshing with the gear 5 is provided at 9a,
Furthermore, a planetary gear 31 meshing with the sun gear 29 is provided. This planetary gear 31 is fixed to the lever 3o and is rotatable about a shaft 32, and when the lever 30 rotates in the direction of arrow C about the shaft 29a, a spool (not shown) winds up a film. The planetary gear 31 meshes with a spool gear 33a provided at the end of the spool gear 33 to transmit the hoisting rotational power of the motor 1. Reference numeral 35 designates the shaft of the autoloading film guide 34, and a spring 36 provided on the shaft keeps the row 7 partially 3
7 against the rubber portion 33b of the spool 33. 40 is a shaft provided on the back cover 42 described below, and also the shaft of the spring 41 for generating the pressing force of the roller 38 pressed against the rubber part 33b of the spool 33 at the tip of the film guide 39.7- It also serves as the shaft 40 of the film guide 39.

Reference numeral 47 denotes an aperture of the camera, and an outer rail 46 and an inner rail 45 are arranged before and after this end.
A film detection button 44 is arranged between 5.46 and 46. When the film (not shown) runs out, the film detection button 44 does not press the cut of the film presence/absence detection switch 43, and the switch 43 opens. It has become. The gears 3, 4, 5, 26, clutch gear 6, and planetary gear 9 are two-stage gears having a large diameter gear and a small diameter gear, as shown in the figure. In addition, 12 is a rewind state memory switch,
When the film is being rewound, the lever 8 moves in the opposite direction of the arrow A around the shaft 7, so the actuator 10 also moves in the same direction, pushing the contact piece 12a toward the contact piece 12b. Then, both liquid pieces 12a and 12b come into contact and close. A two-color mode display board 54 is disposed at the upper end of the actuator 10, and one of the two color mode display boards 54 is displayed through a transparent window provided in the cover 52 that forms part of the exterior of the camera. Visual confirmation is possible through 53. A manual rewind button 56 projects from the camera cover 52, and when pressed, a manual rewind switch 60 for rewinding the film midway through winding is closed.

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 Figures 2 and 3, 6 is a clutch gear, 7 is a shaft, 8 is a clutch lever, 19 is a planetary gear, 10 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,
24 is a rewinding gear, and 55 is a sprocket, the construction of which is as shown in FIG.

Reference numeral 48 denotes an abbreviated lever, which is supported by a shaft 49 at a bent portion, and is rotatable around the shaft 49 . 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 it at the stop position unless another external force is applied. One end 48b of this lever 48 is a part that is actuated by engagement of the actuator 10, and when the clutch lever 8 rotates clockwise together with the actuator 10 around the shaft 7, the lever 48b
8 engages with the actuator 10,
The lever 48 rotates counterclockwise about the shaft 49 against the force of the spring 50. 48a is lever 48
The claw provided at the other end, 42, is the back cover of the camera, and the shaft 4
It is provided so as to be rotatable in the direction of the arrow shown in the figure with the rotation center 2b as the center of rotation, and a locking pawl 42a is provided on the inside thereof. As mentioned above, during film rewinding, the lever 48 and the claw 4
8a rotates in a counterclockwise direction about the shaft 49, and as shown in FIG.
2a 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. 5 is a more detailed circuit diagram of a part of the circuit diagram shown in FIG. 4. It is a diagram.

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, electricity is applied in the order of transistor 71 -> motor 1 -> transistor 74, causing motor 1 to rotate in the forward direction, and when rewinding the film, electricity is applied in order of transistor 72 -> motor 1 -> transistor 73, causing motor 1 to rotate in reverse. The switch 23a is a switch that is closed when the shutter control ends, and turns on the power to the motor drive control circuit 76. In addition, the switch 23a
The film is opened when a portion of the film has been wound.

The switch 23b connected to the input/output terminal of the motor 1 is opened when the shutter control ends to enable electricity to be applied to the motor 1, and is closed when winding of a part of the film is completed. The input and output ends of the motor 1 are short-circuited to apply a brake to the hoisting operation. 76a is a well-known timer circuit, and 76b is a well-known switch interface that determines the states of the rewind state storage switch 12, presence/absence detection switch 43, or manual rewind start switch 60. 76c is a forward/reverse rotation determination circuit that determines the states of the timer circuit 76a and the switch interface 76b, and determines whether to energize the motor 1 in the forward rotation direction or in the reverse rotation direction.

The wiring is such that the output of the forward/reverse rotation determination circuit 76c is applied to the base side of each transistor 71, 72, 73, and 74. The motor drive control circuit 76 is composed of the timer circuit 76c, the switch interface 76b, and the forward/reverse rotation determination circuit 76c. Reference numeral 12 denotes the rewinding state memory switch, which is closed when the film starts to be rewinded and opened when the next film is wound. Reference numeral 43 designates the film presence/absence detection switch, which is closed when the film is on the rails 45 and 46 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 60 denotes the manual rewind opening switch 12, 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 the manual rewind switch 6
0 is connected in parallel. 86 is a pull-up resistor, and when these switches 12°43.60 are open,
A high level (7) signal is only given to the inverter 80. Reference numeral 85 denotes a transistor whose emitter is grounded, which is inputted to the output signal base side of the inverter 80, and whose collector side is connected to the capacitor 75, which has one end grounded, the resistor 87, and the input side of the inverter 82.

Note that this capacitor 75 is connected to a resistor 92 and a switch 23c.
A circuit in which these are connected in series is connected in parallel. Switch 23c has the same operation as switch 23b. Reference numeral 83 denotes a NAND gate, which inputs the output signals of the inverter 81 and the inverter 82, respectively, to which the output signal of the inverter 80 is input.

The output signal of this NAND gate 83 is outputted to the a' terminal of the forward/reverse rotation determination circuit 76c via the inverter 84, and is connected to the inverter 84, a transistor 90 whose emitter is grounded, and the collector side of this transistor 9o. The current is outputted to the a terminal of the forward/reverse rotation determination circuit 76c via the current control resistor 91. 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 connected to a transistor 88 whose emitter is grounded and a current limiting resistor connected to the collector side of this transistor 88. It is outputted to the b terminal of the forward rotation/reverse rotation determination circuit 76c via the signal line 89. Note that terminals a, a', b, and b' of the forward/reverse rotation determination circuit 76c are connected to the base sides of transistors 71.74 and 72.73, 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 FIGS. 1 to 3, when a film winder (not shown) is loaded into the camera, the motor 1 is moved in the direction of the arrow shown in the figure, that is, in the direction of the arrow, in the film winding mode, along with the gear 2 via the shaft 1a. rotate in the direction of rotation.

The rotational power of the motor 1 is transmitted to the clutch gear 6 via the reduction gear train 3, 4.5, which rotates in the direction of the arrow in the figure as the gear 20 rotates. Since the clutch gear 6 rotates in the direction of the arrow shown in the figure, the clutch lever 8 rotates in the direction of the arrow with the shaft 7 as the center of rotation, causing the planetary gear 9 to mesh with the sprocket gear 11. Planetary gear 9 and sprocket gear 11
The sprocket gear 11 rotates in the direction of the arrow shown in the figure, and the rotation of the sprocket gear 11 causes the sprocket 55 to rotate in the same direction via the shaft 11a, 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 around the shaft 2911, thereby meshing the planetary gear 31 and the spool gear 33a. The planetary gear 31 also rotates in the direction of the arrow shown in the figure as the sun gear 290 rotates, and together with this, the spool gear 33a also rotates in the direction of the arrow in the figure, and the spool 33 is rotated in the same direction as the spool gear 33a. As a result, the rubber part 33b on the spool 33, the roller 38, and the roller 37
Due to the action of
Roll up one piece at the top. The construction and operation of this winding section is described in detail in Japanese Patent Application Laid-Open No. 172322/1987, which was previously proposed by the applicant of the present invention, and therefore will not be described 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, the rotational force of the sprocket gear 11 is applied to the planetary gear 1 rotating in the direction of the arrow shown in the figure.
4 and is transmitted to the charge gear 16 via the idler gear 15, and the charge gear 16 rotates in the direction of the arrow shown in the figure together with the charge cam 16a and the indexing cam 16b. One rotation of the charge cam 16a causes the follower roller 18 to move the charge lever 17 around the shaft 17a.
At the same time, it is rotated in the direction of the arrow against the force of the spring 19, and then moves in the direction opposite to the direction of the arrow and returns to the initial position. By moving the charge lever 17 in the direction of the arrow, the lens and shutter of the automatic focus 16 (not shown) engaged with the lever 17 are moved, and are set to an initial state in which photography is possible. Further, the follower lever 20 whose one end is in contact with the indexing cam 16 is rotated in the direction of arrow E against the force of the spring 21 with the id shaft 17a as the center of rotation, and the contact piece 22 is moved on the printed wiring board 23. , after one more rotation, index one end of the follower lever 20 and move the cam 1
6b, and rotate the follower lever 20 in the direction of arrow E by the restoring force of the spring 21 to move the contact piece 22 onto the printed wiring board 23 in the same direction, thereby forming the following switches 23a and 23b. . Furthermore, the follower lever 20 is temporarily rotated in the direction of arrow E about the shaft 17a by a lever (not shown) that is activated when the control of the shutter (not shown) is completed, and the contact piece 22 is moved. A switch corresponding to the switch 23b below consisting of a and a printed wiring board 23 is opened, and the far end of the motor 1 is not short-circuited.
The switch 23a described below is closed, the power is turned on, and the next film winding operation begins.

Due to the above operation, a film (not shown) is placed on the spool 33.
After being wound in one go, the film (not shown) is not fed by the sprocket 55 as described above, but by the rotation of the spool 33 [thus, the film (not shown) is pulled out of the cartridge and onto the spool 33. It is rolled up one part at a time. When the control of the shutter (not shown) is completed, the motor ↑ rotates in the direction of the arrow along with the gear 2 via the shaft 1a by the same operation as above. This rotational force is transmitted to the spool gear 33aK via the gear 3°4.5, the sun gear 29, and the planetary gear 31, and the spool 33 rotates in the direction of film winding (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 this 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. This sprocket gear 11
The rotational speed is from motor 1 to gear 2 and gear train 3 for reduction,
Since the gear ratio is configured to be faster than the rotational speed of the planetary gear 9 which rotates in the direction of the arrow in the figure through the clutch gear 6 and the clutch gear 6, the clutch gear 9 rotates while being rejected by the sprocket gear 11. It's just being there. The rotational force of this sprocket gear 11 is transmitted to the charge gear 18 via the planetary gear 14 and the idler gear 15 as described above, and the charge cam 1 rotates together with the charge gear 18.
6a, the charge lever 17 is moved in the direction of the arrow via the follower roller 18, and the above-mentioned lens and shutter (not shown) are initialized.

Further, when the indexing cam 16b rotates once, the contact piece 22 moves over the printed wiring board 23 via the follower lever 20 as described above, and then returns to the position before winding the film, and the contact piece 22 and the printed wiring board are moved. Opening of the following power switch 23a and switch 23b in relation to the wiring board 23
By closing, the input and output terminals 19-1 of the motor 1 are short-circuited, the motor 1 is stopped, and the film winding operation is stopped until the next shutter control is completed. During film winding operation, as shown in FIG. 2, the actuator 1o is rotated about the shaft 7 and is forced counterclockwise together with the clutch lever 8, so that one end of the lever 48 is rotated. 48b. Therefore, the restoring force of only the spring 5o is applied to the lever 48, and a force is applied in the clockwise direction about the shaft 49, so that the lever 48 is positioned at the stop position by the stop member 51, so that the lever 48 is moved between the claw 48a and the back cover. 42 locking claws 42a
does not lock. At this time, of course, the contact piece of the rewind state memory switch 12 is being pushed by the actuator 10, so this switch 12 is opened. Further, the colors on the left side of the two-color mode display plate 54 can be observed through the transparent window 53 in FIG. 1, as shown by the dashed line, indicating that the film is being wound.

Next, when the winding of the film is completed and the film (not shown) is in a stretched state, the -20~ rotational force of the motor 1 cannot resist this force and stops rotating. The spool 33 is also sprocket 5.
5 also stops moving, and the charge cam 16a and index cam 16b 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. The motor 1 is reversely rotated by the action of the control circuit 76 shown in FIG. 4 to automatically rewind the film (not shown) onto the sprocket (not shown). When the motor 1 rotates in a reverse direction with the gear 2 via the shaft 1a in the direction opposite to the direction of the arrow shown in the figure, a gear train 3.4.5 for deceleration that interlocks with the gear 2.
The clutch gear 6 and the sun gear 29 also rotate in the direction opposite to the arrow shown in the figure. The rotational force of this sun gear 29 is the lever 30
Since the lever 30 is rotated in the opposite direction of the arrow C about the shaft 29a, the planetary gear 31 also moves together with the lever 30, and the engagement between the planetary gear 31 and the spool gear 33a is broken. Therefore, the spool gear 33a and the spool 33 attached thereto are in a free rotating state. Further, due to the rotation of the clutch gear 6 in the direction opposite to the illustrated arrow, the clutch lever 8 rotates together with the planetary gear 9 and the actuator 10 in the direction opposite to the arrow A around the shaft 7, and the planetary gear 9 is rotated in the direction opposite to the direction of the arrow A, and the planetary gear 9 is rotated with the sprocket gear 11. The mesh is broken and meshes with the gear 24. At this time, the actuator 10 presses the contact piece 12a of the rewinding state memory switch 12 onto the contact piece 12b (Jll) as shown in FIG.
12b to close the rewind state memory switch 12. In addition, similarly ((, actuator 10 is lever 4
8, and by rotating the lever 48 counterclockwise about the shaft 49 against the force of the spring 50, the claw 48b of the lever 48 is connected to the back cover 42 of the camera body. It is locked by the locking claw 42a. Therefore,
In the film rewind mode, the claw 48b and the locking claw 4
Due to the locking by 2aK, the back cover 42 does not rotate and does not open even if it is pulled in the direction of the arrow shown in the figure with the shaft 42b as the center of rotation. Furthermore, in FIG. 1, 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, it is indicated by a dashed line. Two-color mode display board 5
You will see 4 other colors displayed, which identifies that you are in film 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, 24, 25, 26, 24, 24, 25, 26, 24, 25, 26, 24, 25, 26 of the planetary gear 9 of the film rewinding system receive the rotational force of the planetary gear 90.
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 a winding core of a no-hatrone (not shown). At the start of film rewinding, 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 the rotation center is the shaft 11a. Move the lever 13 in the opposite direction of arrow B to connect the planetary gear 14 and idler gear 15.
The meshing with the sprocket 55 is broken and the sprocket 55 is allowed to rotate freely.

Therefore, the film 23- (not shown) is rewound onto the cartridge (not shown) by the rotational force of the rewind gear 28 alone. Note that even if the power of the power supply battery (not shown) that drives the motor 1 is exhausted and the motor 1 stops during rewinding of the film, making it impossible to rewind the film, the rewinding state described above 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 two-color mode display board 5 through the transparent window 53.
By looking at the mode color number 4, you can confirm that even if the rewind mechanism has stopped operating, it is still in the film rewind mode, and you can 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 rewound again by starting from the rewinding state 24-.

When all the film (not shown) is rewound in this way, the film detection button 44 located between the inner rail 45 and the outer rail 460 of the aperture 47 will be activated when the film (not shown) runs out. The contact side of the presence/absence detection switch 43 is no longer pressed, and both contact pieces of the film presence/absence detection switch 430 are separated, and the film presence/absence detection switch 43 is opened. This film presence/absence detection switch 4
3 is opened, the motor drive control circuit 76 shown in FIG. 4 switches again from the film rewinding state to the film winding state as described below. As a result, motor 1 @
The camera is rotated normally in the direction of the arrow shown in the figure together with the gear 2 via the gear 1a, and the clutch levers 8, 30.degree. 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 16b 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, the two-color mode display plate 54 displays the film winding mode, and the back cover 42 can be opened in the same manner as described above. Note that 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 finger and closes the manual rewind switch 60 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 operating the lever 20 with a shutter travel completion lever (not shown).

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 presence/absence detection switch 43 is opened.
is closed, and the manual rewind start switch 60 is opened. When the switch 23a is closed and the power source battery 70 is turned on to the motor drive control circuit 76,
Since the inverter 800 Å voltage is pulled up to a high level by the pull-up resistor 86, the output signal of the inverter 80 becomes an A low level. Therefore,
Since the transistor 85 of the timer circuit 76a receives this output signal from the switch interface 76b,
Transistor 85 becomes non-conductive, and switch 23a
Since the switch 23c is opened in synchronization with the timer circuit 7, the capacitor 75 starts charging via the resistor 87
The operation 6a starts. Since the input signal of the inverter 81 is the output signal of the inverter 80, the output signal of the inverter 81, which is inputting the N low level signal, is at the ゝ)-I level. Therefore, the switch interface 7
This signal is output from 6b to the forward/reverse rotation determination circuit 76c. On the other hand, the inverter 820 input signal is
Since the charging voltage of the capacitor 75 does not exceed the threshold voltage of the inverter 82 until a predetermined time after the power is turned on, the output signal of the inverter 27-82 will be at the level of 11. ,
This signal is output from the timer circuit 76a to the forward/reverse rotation determination circuit 76c. The input signal of the NAND gate 83 is the output signal of the inverter 81 and the input signal of the inverter 82.
Since the output signal is
)・A "low" level signal is output by inputting a "high" level output signal. Therefore, this "low" level signal is applied to the terminal b' and the base side of the transistor 88, so the transistor 88 is turned off. Becomes conductive. Furthermore, since this output signal is given as an input signal to the inverter 84, the inverter 84 outputs a signal of 5<i><i> level.

Since this 1\no-i level signal is applied to the terminal a' and the pace side of the transistor 90, the transistor 90
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, the terminal b is at a low level, and the terminal b'
is non-conductive, so transistors 72 and 73 are non-conductive.

28- As mentioned above, the switch 23b is opened when the printer control is completed, so the closed circuit of the power supply battery 70 → transistor 71 → motor 1 → transistor 74 is energized, and the motor 1 is energized and rotates in the forward direction. Wind the film as shown above. After that, when the film has been wound by one frame, the switch 23b is closed and the input terminals of the motor 1 are short-circuited, and the switch 23& is opened, so the motor 1 stops rotating and the film winding operation is stopped. .

Further, in synchronization with this, the switch 23e is closed, and the charge stored in the capacitor 75 is discharged via the resistor 92 and the switch 23c. In this way, when the winding of a portion of the film is completed, the switch 23a is opened, and the switches 23b, 23c are closed, and when the shutter control is completed, the switch 23a is closed, and the switches 23b, 23c are closed.
23c is opened. These switches 23a, 23
b and 23c are composed of the contact piece 22 shown in FIG. The follower lever 20 is rotated about the axis 17a in the opposite direction of the arrow E, and the contact piece 22 is slid on the printed wiring board 23 to connect the switches 23a, 23b,
23c as described above, and when the shutter control is completed, the follower lever 20 is activated by a lever (not shown).
By rotating the follower lever 20 in the direction of arrow E around the shaft 17a,
The switches 23a, 23b, and 23c are operated as described above, and the states of the switches 23a, 23b are maintained depending on the relationship between the follower lever 20 and the indexing cam 16b during subsequent film winding. Note that detailed configuration diagrams of the switches 23a, 23b, and 23c are omitted for simplicity. In addition, resistance 87
Since the charging time required to reach the Z value voltage of the inverter 82 in the capacitor 75 via the capacitor 75 is set to be longer than the time required to unwind a portion of the film, when the winding of one frame of film is completed, Since the switch 23a is opened, the terminals a' and b' of the forward/reverse rotation determination circuit 76c of the motor drive control circuit 76 are at a low level, and the transistors 88 and 90 of the terminals a and b are in a non-conducting state. As a result, the transistor 7 becomes non-conductive.
1, 72, 73, and 74 are all in a non-conductive state, and the input and output terminals of the motor 1 are short-circuited by the switch 23b, and the motor 1 is braked and stopped. When the film has been fully wound and the film is stretched,
Switch 23a is closed and switches 23b, 23
c remains open. Therefore, the capacitor 75 continues to be charged via the resistor 87 during the winding operation described above. This charged voltage further increases and exceeds the threshold voltage of inverter 82. As a result, the inverter 82 transfers the 'low' level signal to the NAND gate 83.
Output to. The NAND gate 83 inputting this signal outputs the N high level signal to the normal rotation/reverse rotation determining circuit 76c.
Output to the ′ terminal.

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 N high level signal is input also outputs the 1 low level signal 31- to the terminal a', and furthermore, this signal is given to the base side of the transistor 90, so the transistor 90
becomes non-conductive. Therefore, the transistor 72 becomes conductive via the resistor 89 and the transistor 88, and the transistor 73 also becomes conductive because a "high" level signal is input to its base side. However, the terminal a becomes non-conductive. Therefore, the transistor 71 is in a non-conducting state, and the transistor 74, whose base side receives a 6-low level signal from the terminal a', is in a non-conducting state.Therefore, the power supply battery 70→transistor 72→ Motor 1 →
The closed circuit of transistor 73 is energized.

What is important here is that the direction of the current flowing through the motor 1 is opposite to the direction in which the film is wound, so the motor 1 rotates in the opposite direction. This rewinds the film, but
As described above with reference to FIGS. 1 to 3, the rewind state memory switch 12 is closed at the start of rewinding the film.

Since the film presence detection switch 43 is closed,
The input side of the inverter 80 is grounded, and a high level signal is output from it. This "no-i" level signal is input to the inverter 81, which outputs a low-level signal and gives it to the NAND gate as an input signal.On the other hand, the high-level output signal of the inverter 80 is used as the base The transistor 85 inputted to the side becomes conductive, and the electric charge in the capacitor 75 is discharged.

Therefore, the charging voltage of the capacitor 75 does not exceed the threshold voltage of the inverter 82, so the inverter 82 outputs a signal of 1 high level to the NAND gate 83.NAN
Since the D gate 83 inputs the low level output signal of the inverter 811) and the 1-high level output signal of the inverter 82, it outputs the low-level signal and rewinds the film in the same manner as the above operation. There is no change in condition. Even if the power source battery 70 is removed because the power of the power source battery 70 is exhausted and the circuit becomes inoperable, the first
Since the relationship between the indexing cam 16b and the follower lever 20 shown in the figure remains in the mid-winding state, the switch 23a is closed and the switch 23b is closed.

23c remains open. Since the rewind and rewind state memory switch 12 remains closed, even if
Even if a new power supply battery 70 is replaced, the rewinding state before replacement is maintained, and the film is rewound again in the same manner as described above. When the rewinding of the film is completed, the film presence/absence detection switch 43 is opened.
A λ high level signal is input to the inverter 80 by the pull-up resistor 86. Therefore, the inverter 80
outputs a six-low "level signal and applies it to the inverter 81 and transistor 85. The inverter 81 inputting this signal outputs a "\high" level signal, while the transistor 85 becomes non-conductive and resistor Capacitor 75 is charged via 87. Since this charging voltage does not exceed the threshold voltage of inverter 82, inverter 8
2 outputs a high level signal. NA inputting “high” level from both inverters 81 and 82
The ND gate 83 outputs a 10-" level signal. This signal is outputted as a "high" level signal to the forward rotation/reverse rotation determination circuit 76c terminal a' via the inverter 84 in the same manner as described above. The terminal a is made conductive through the resistor 91 and the transistor 9o. Therefore, the transistor 7 ],
, 74 become conductive, and the closed circuit of power supply battery 7°→transistor 71→motor 1→transistor 74 is energized, and as the motor 1 rotates in the normal 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 closed to stop the winding operation.

Therefore, when the power supply to the motor 1 is stopped, charging of the 7-layer mechanism is always completed.

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, and 72 due to the instantaneous current flowing
In order to prevent damage to 73 and 74, it is desirable to appropriately intervene a resistor for controlling the current 35.

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, the present invention provides a camera winding/rewinding device that winds a film by forward rotation of a motor and rewinds the film by rotating the motor in reverse. The film is wound by transmitting the rotation of the motor only to the spool for winding the film, and the output of the timer circuit is set to a time longer than the time it takes for one frame of film to be wound by the rotation of the spool. This causes the motor to start rotating in the opposite direction, so there is no risk of the sprocket rotating and damaging the perforations of the film when the film is wound to the end. When this happens, the film end detection signal can be reliably obtained from the timer circuit, so that rewinding of the film can be started accurately.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the camera winding and rewinding device of the present invention, Fig. 2 is a plan view of the main part showing the film winding state of this embodiment, and Fig. 3 is the same film rewinding state. 4 is a circuit diagram showing the control circuit of this embodiment, and FIG. 5 is a circuit diagram showing the main part of the circuit in FIG. 4 in detail. 1... Motor 23... Printed wiring board 28... Rewinding gear 28a... Rewinding fork portion 33... Spool 33a... Spool gear 76... Motor drive control circuit 76a...・Timer circuit'/6b...Switch interface 76c...
Motor forward/reverse rotation determination circuit

Claims (1)

[Claims] In a camera winding/rewinding device that winds the film by forward rotation of a motor and rewinds the film by reverse rotation of the motor, when the film is wound, the rotation of the motor is used to wind the film. The film is wound by transmitting the signal only to the spool, and the motor is started to rotate in reverse by the output of a timer circuit set to a time longer than the time it takes for one frame of film to be wound by the rotation of the spool. A camera winding and rewinding device that has been patented.