JP2636732B2 - Film rewinding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film rewinding device for a camera in which film rewinding is performed electrically.

[0002]

2. Description of the Related Art Conventionally, this type of apparatus includes (1) an apparatus for automatically stopping a rewinding operation with a terminal end (tongue) of a film slightly left outside a cartridge, and (2) an apparatus for attaching the tongue to a cartridge. In some cases, the rewinding operation is automatically stopped in a state where all the films are wound in the patrone without leaving them outside.

[0003]

However, in the conventional apparatus, the operating member for selecting the rewinding method is always exposed so as to be operable from the outside of the camera. On the other hand, there is a possibility that the space or operation may be adversely affected.

The present invention has been made in view of such problems, and has as its object to provide a film rewinding device which has good appearance and does not adversely affect other various operation members. .

[0005]

In order to achieve the above object, according to the present invention, there is provided a film rewinding device, comprising: a rewinding means (6) for rewinding a film to a patrone; and a predetermined portion of the film projecting a predetermined amount from the patrone. Detecting means (45, 46) for detecting whether or not the film is rewound, and operating means (55, 46) for selecting whether or not to wind the film into the cartridge by the rewinding means (6). 4
7) and control means for stopping the operation of the rewinding means (6) in accordance with the selection result by the operating means (55, 47) and the detection result of the detecting means (45, 46) (the circuit in FIG. , 110) and a lid (9) that is provided to be openable and closable with respect to the camera body (1a) and, when in the closed position, accommodates the operation means (55, 47) so that it cannot be operated externally. It is.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. Note that, in the reference example and the embodiment, similar portions are denoted by the same reference numerals. FIG. 1 shows a reference example of the present invention. FIG. 1 is a perspective view of the inside of a camera in which an automatic stop device for rewinding according to a reference example is incorporated. As shown in FIG. 1, a camera 1 is provided with a pressure plate 2 for guiding a film F of a loaded cartridge P, a sprocket 3, and a spool 4. Further, the camera 1 has a motor M as an electric motor, a film winding mechanism 5, a film rewinding mechanism 6, a rewinding operation unit 7, and transmission of the driving force of the motor M in conjunction with the rewinding operation unit 7. Mechanism 8 for switching the mechanism to a film winding mechanism 5 or a film rewinding mechanism 6, and an opening / closing mechanism 10 for a back cover 9.
, A lock mechanism 11 and an automatic stop device 12 for rewinding.

The sprocket 3 has a sprocket shaft 13
Are inserted, and the sprocket 3 and the sprocket shaft 13
And a clutch 14 is provided therebetween. When the sprocket shaft 13 is in the raised position as shown in FIG.
When the sprocket shaft 13 is pushed down from the position shown in the figure, the connection between the sprocket 3 and the sprocket shaft 13 is cut off. A release button 13a protruding outside the camera 1 is formed at the tip of the sprocket shaft 13, and a large diameter portion 13b is formed below the release button 13a. A pin 13c protrudes from a lower portion of the sprocket shaft 13, and a release block 15 is fixedly provided at a lower end thereof, and a spring member 16 for urging the sprocket shaft 13 to a raised position is provided. Step 15a of release block 15
Is supported by a shaft 17a.
The locking member 17 has its tip 17c formed by a spring member 17b.
Is urged in a direction in which it comes into contact with the outer peripheral portion 15b of the release block 15.

The film winding mechanism 5 transmits the rotation of the motor M to the sprocket 3 and the spool 4 via the clutch mechanism 8, and includes a first gear 18, a sprocket gear 19, a second gear 20, a third gear 21, It is composed of a spool gear 22. Sprocket gear 19
A sprocket shaft 13 is rotatably fitted to the outside, and a slot 19b through which a pin 13c penetrates is formed in a cylindrical portion 19a of the sprocket gear 19. As a result, the sprocket shaft 13 can rotate together with the sprocket gear 19, and the sprocket shaft 13 can slide up and down with respect to the sprocket gear 19.

The spool gear 22 is connected to the spool 4 via a friction clutch 23 and has a reverse rotation preventing claw 24.
Thus, counterclockwise rotation is prevented.

The rewinding operation section 7 is fixed to the shaft 25 and operably protrudes out of the camera 1.
, A cam 27 fixed to the center of the shaft 25, a switching lever 28 fixed to an end of the shaft 25, a leaf spring 29, and a rewind switch 30. The rewind lever 26 is rotatable counterclockwise from the original position shown in the figure to the rewind position about the shaft 25 together with the cam 27 and the switching lever 28. The leaf spring 29 is used to hold the rewind lever 26 at the original position or the rewind position.
8a or 28b can be engaged. Also, the cam 27
Is provided with a cam portion 27a, and the switching lever 28 is provided with a forked portion 28c.
And an arm 28d are formed respectively. Arm 28
d is provided so as to turn on the rewind switch 30 by turning counterclockwise from the position shown in the figure.

The film rewinding mechanism 6 transmits the rotation of the motor M to the hub P1 of the patrone P via the clutch mechanism 8, and transmits the rotation to the cylindrical portion 32a of the first gear 31, the second gear 32, and the second gear 32. Inserted rewind shaft 33, rewind shaft 3
3 comprises a disk 34 and a fork 35. The cylindrical portion 32a is provided with a slot 32b through which a pin 33a fixed to the rewind shaft 33 passes. As a result, the rewind shaft 33 is rotatable together with the second gear 32 and is slidable with respect to the second gear 32 in the vertical direction. Since the disc 34 is sandwiched by the bifurcated portions 28c, the fork 35 moves up and down together with the disc 34 between a non-engaged position shown in the figure and an engaged position raised above the position by rotation of the switching lever 28. It is possible. The fork portion 35 engages with a key (not shown) of the hub P1 at the engagement position.

The clutch mechanism 8 connects the motor M to the first gear 18 of the film winding mechanism 5 when the rewind lever 26 is at the original position, and connects the motor M to the film when the rewind lever 26 is at the rewind position. An interlocking system 36 is connected to the switching lever 28 of the rewind operation unit 7 so as to connect the first gear 31 of the rewind mechanism 6.

The opening / closing mechanism 10 includes a locking member 9a fixed to the back cover 9 and an operating member 37 formed with an engaging portion 37a meshing with the locking member 9a and operated from outside the camera 1. It is configured. The operating member 37 can be moved up and down between a closed position shown in the figure and an open position displaced upward from the closed position.

The lock mechanism 11 includes a rotating lever 38 and a lock member 39. Rotating lever 38
Is urged counterclockwise by a spring member 40 about a shaft 38a, and the cam portion 27 of the cam 27 is urged by the urging force.
A locking portion 38c for locking the arm 38b in contact with a and the lower end 39a of the lock member 39 is formed. The lock member 39 is urged counterclockwise by a spring member 41 about the axis. The lock member 39 has a stepped portion 39b for locking the non-locked portion 37b of the operation member 37 when rotated clockwise from the unlocked position shown in the figure.

In the vicinity of the sprocket shaft 13, a switch lever 42 is pivotally supported by a shaft 42a. The switch lever 42 is urged in a counterclockwise direction by a spring member 43 and is locked at the original position shown in FIG.
The switch lever 42 is formed with a projection 42b protruding within the displacement trajectory of the large diameter portion 13b of the sprocket shaft 13, and a film detection switch 45 is held at the base end thereof. Contact piece 45a of film detection switch 45
The base of the detection pin 46 is fixed to the. Detection pin 4
6 contacts the upper edge F1 of the film F when the switch lever 42 rotates clockwise from the position shown in FIG.
When the terminal end of the film F passes, it can protrude into the through hole 2a of the pressure plate 2 by its own urging force. The contact pieces 45a and 45b of the film detection switch 45 are the detection pins 4
6 is closed when the leading end of the pin 6 contacts the film F, and is opened when the film passes and the leading end of the pin 46 penetrates the hole 2a. The positions of the detection pin 46 and the through-hole 2a are located away from the entrance P2 of the cartridge P by a distance longer than the transport distance of the film F due to the inertia of the motor M.

A T position where the rewinding operation is automatically stopped with the end of the film F slightly left outside the cartridge P;
A selector 48 is provided which can be switched to an N position where the rewinding operation is automatically stopped in a state where all the films F have been wound into the cartridge P without leaving the terminal end outside the cartridge P. The selector 48 is operable outside the camera 1, and a cam 48a is integrally provided at the lower end thereof. The cam 48a turns off the switch 47 when the selector 48 is at the T position, and turns on the switch 47 when the selector 48 is at the N position.

In FIG. 2, reference numeral 100 denotes a hoist signal generator for outputting an H level hoist signal upon completion of a series of exposure control operations. This hoist signal is input to an AND gate 108. Reference numeral 101 denotes a rewind stop signal generation unit that outputs an L-level rewind stop signal for stopping the motor M to the AND gate 107. This rewind stop signal creating unit 101
Is a switch 47 connected in series between the film detection switch 45, a pull-up resistor 102 connected in series to the film detection switch 45, and a connection point between the pull-up resistor 102 and the film detection switch 45 and ground.
And a capacitor 103, and an inverter 104 whose input terminal is connected to the connection point. Here, the inverter 104 has a configuration including a Schmitt circuit (not shown) and the like, and is configured to change the output from H to L when the voltage at the connection point exceeds a predetermined voltage.

The rewind switch 30 is connected in series to a pull-up resistor 105, and the connection point is connected to an inverter 106.
Is connected to the input terminal of The output terminal of inverter 106 is connected to the input terminals of AND gates 107 and 108. However, the input to 108 is applied as an inverting input. Each output terminal of the AND gates 107 and 108 is connected to an input terminal of the OR gate 109.
The output terminal of the OR gate 109 is connected to the base of the transistor 110. The collector of the transistor 110 is connected to the motor M, and the emitter is connected to the ground.

When the switch 47 is turned on, the pull-up resistor 102 and the capacitor 103 output an L-level rewind stop signal from when the film detection switch 45 is turned off to when the output of the inverter 104 is inverted. This is a time constant circuit for increasing the time required for output to 107. The time constant is such that when the end of the film F reaches a distance within a range in which the distance from the inlet P2 of the cartridge P is shorter than the transport distance of the film F due to the inertia of the motor M, a rewind stop signal is output to the AND gate 107. It is stipulated that

Next, the operation will be described.

(1): In a normal photographing state, the rewind lever 26 is at the original position shown in FIG. 1 and the arm 28d of the switching lever 28 is separated from the rewind switch 30. Is off. Therefore, an L level signal is output from the inverter 106 to the AND gate 1
08 inverting input terminal. The motor M
Is connected to the first gear 18 of the film winding mechanism 5 via the clutch mechanism 8.

When a series of exposure control operations is completed, the hoist signal generator 100 outputs the H level hoist signal to the AND gate 1.
08. At this time, the AND gate 108 outputs an H level signal to the OR gate 109,
9 also outputs an H level signal to the transistor 110.
Therefore, the transistor 110 turns on and the motor M
Rotates. The rotation of the motor M is controlled by the clutch mechanism 8, the first gear 18, the sprocket gear 19, the sprocket shaft 1
3 and the clutch 14, and transmitted to the sprocket 3, and also transmitted to the spool 4 via the second gear 20, the third gear 21, the spool gear 22 and the friction clutch 23. As a result, the spool 4 and the sprocket 3 rotate to wind up the film F. When the film F is wound up by one frame, the output signal from the winding signal creating unit 100 becomes L level, and the motor M stops.

(2): When photographing of all frames is completed and rewinding is performed, the release button 13a of the sprocket shaft 13 is pushed down from the raised position in the figure, and then the selector 48 is switched. Then, the rewind lever 26 is rotated counterclockwise from the original position shown in the figure to the rewind position.

When the sprocket shaft 13 is pushed down,
The large diameter portion 13b is a protrusion 42b of the switch lever 42.
, The switch lever 42 rotates clockwise around the shaft 42 a against the urging force of the spring member 43. By this rotation, the film detection switch 45 and the detection pin 46 are pushed to the film F side. At this time, since the film F is on the pressure plate 2, the tip of the detection pin 46 is
And the contact piece 45a contacts the contact piece 45b, and the film detection switch 45 is turned on.

Next, when it is desired to automatically stop the rewinding operation with the end of the film F slightly left outside the cartridge P, the selector 48 is switched to the position T as shown in FIG. By this switching, the cam 48a switches the switch 4
Turn 7 off.

When the rewind lever 26 is rotated counterclockwise from the original position shown in the drawing to the rewind position, the cam portion 27a of the cam 27 pushes the arm portion 38b of the rotary lever 38, and the rotary lever 38 is turned. It rotates clockwise from the position shown in the figure by the urging force of the spring member 40. By this rotation, the lock member 39 is rotated counterclockwise by the urging force of the spring member 41, and the step portion 39b
Locks the non-locking portion 37b of the operating member 37, the operating member 37 is locked at the closed position where the engaging portion 37a locks the locking member 9a, and the back cover 9 is I can't open it.

When the rewind lever 26 is turned counterclockwise, the switching lever 28 is also turned in the same direction, and the fork 28c
Pushes up the disk 34 and the arm 28d turns on the rewind switch 30. When the fork part 28c is pushed up, the fork part 35 rises and engages with the key of the hub P1. Further, the clutch mechanism 8 is switched, the motor M is connected to the first gear 31 of the film rewinding mechanism 6 via the clutch mechanism 8, and the rotation of the motor M can be transmitted to the hub P1. When the rewind switch 30 is turned on, the film detection switch 45 has already been turned on. Therefore, when the rewind switch 30 is turned on, an L-level signal is input to the input terminal of the inverter 106, and an H-level signal is output from the inverter 106 to the input terminal of the AND gate 107 and the inverted input terminal of the AND gate 108, respectively. Is done. As a result, the gate of the AND gate 108 is closed. Since the film detection switch 45 has already been turned on, the inverter 1
04 is at the L level, and therefore the H level output signal is A
Since the signal is input to the ND gate 107, the output of the AND gate 107 becomes H when the rewind switch 30 is turned on.
When the level signal is input, the transistor 110 turns on and the motor M rotates.

The rotation of the motor M is transmitted to the hub P1 of the patrone P via the clutch mechanism 8, the first gear 31, the second gear 32, the rewind shaft 33 and the fork portion 35, and the film F is wound inside the patrone P. Will be returned.

When the rewinding operation proceeds and the end of the film F passes through the tip of the detection pin 46, the tip of the detection pin 46, which has been in contact with the upper edge F1, up to this point, becomes the through hole 2a of the pressure plate 2. And enters into the inside by the urging force of the contact piece 45a. As a result, the contact piece 45a is separated from the contact piece 45b, and the film detection switch 45 is turned off. Film detection switch 45
Is turned off, an H-level signal is immediately input to the inverter 104, and an L-level signal is output from the inverter 104, that is, from the rewind stop signal generator 101 to the AND gate 1.
07, and an L-level signal is input to the transistor 110 via the OR gate 109. This signal turns off the transistor 110 and cuts off the current to the motor M. That is, when the end of the film F passes through the tip of the detection pin 46, the power supply to the motor M is stopped, and the film F is further rewound by the inertia of the motor M. Here, the leading end of the detection pin 46 detects the terminal end of the film F at a position away from the entrance P2 of the patrone P by a distance longer than the transport distance of the film due to the inertia of the motor M. Even if the film F is further rewound, the motor M is stopped with the terminal end of the film F slightly left outside the cartridge P, and the rewound operation is automatically stopped.

If it is desired to automatically stop the rewinding operation in a state where all the films F have been wound in the cartridge P without leaving the terminal end of the film F outside the cartridge P, the release button 13a must be depressed. From the position of FIG.
To the N position. By this switching, the cam 48a turns on the switch 47. In this state, the rewind lever 2
When the switch 6 is switched from the position shown in FIG. 1 in the counterclockwise direction, the rotation of the motor M is transmitted to the hub P1 as described above, and the film F is rewound into the cartridge P.

When the rewinding of the film F proceeds and the end of the film F passes through the tip of the detection pin 46, the tip of the detection pin 46, which has been in contact with the upper edge F1 up to this point, becomes the pressure plate 2 in the same manner as described above. The contact piece 45a enters the through hole 2a by the urging force of the contact piece 45a, whereby the contact piece 45a is separated from the contact piece 45b, and the film detection switch 45 is turned off. At this time, switch 4
7 is on, the input signal to the AND gate 107 remains at the L level even when the film detection switch 45 is turned off, and the current passing through the pull-up resistor 102 starts charging the capacitor 103 from this point. . When a certain period of time defined by the time constant determined by the resistance value of the pull-up resistor 102 and the capacitance value of the capacitor 103 has elapsed since the film detection switch 45 was turned off, the input signal to the AND gate 107 changes from H level to L level. Become a level. As a result, an L-level signal is output from the inverter 104 in the same manner as described above, and the power supply to the motor M is cut off. At this time, the power to the motor M is cut off, but the film F is further rewound by the inertia of the motor M.
Here, the time constant is set to an L level rewind stop signal when the end of the film F reaches a range in which the distance from the entrance P2 of the cartridge P is shorter than the transport distance of the film F due to the inertia of the motor M. Is output from the inverter 104 to the AND gate 107, the film F is further rewound by the inertia of the motor M, and the motor M is stopped in a state where the film F is completely wrapped in the patrone P, and the rewind operation is performed. Is automatically stopped.

Next, an embodiment of the present invention will be described with reference to FIGS.

In this embodiment, instead of providing the selector 48 in the above-described reference example, the operation section of the selector for switching the switch 47 is provided in a reduced size.
The operation unit is configured to be visible from the outside only when the back cover 9 is opened.

As shown in FIG. 3 and FIG.
Is provided with a screw 55 as an operation unit.
The screw 55 is screwed into a bush 56 attached to the main body 1 a of the camera 1.
“a” is configured to be able to contact the contact piece of the switch 47.

In the above configuration, as shown in FIG.
Screwed into the switch 4
7 is pressed, and the switch 47 is turned on. And
When the screw 55 is loosened from the position shown in FIG.
a is separated from the contact piece of the switch 47, and the switch 47 is turned off.

Therefore, according to the first embodiment,
Since the operation unit of the selector that does not need to be operated frequently on a daily basis is reduced in size and the operation unit is disposed inside the back cover 9, the operation unit is not exposed to the outside and has a good external appearance. In addition, adverse effects on space or operation on other various operation members can be avoided.

In the first embodiment, the screw 5
5 instead of using two pins of different lengths,
The switch 47 may be operated by using one of the two pins.

[0038]

According to the present invention, a lid is provided so as to be openable and closable with respect to a camera body and, when in a closed position, accommodates an operation means for selecting whether or not a tongue is to be protruded from the outside so as not to be operated externally. , So it looks good on the exterior,
In addition, there is no risk of adversely affecting the space or operation of other various operation members. That is, according to the present invention, it is possible to secure an installation space for other operation members, and to place the switching member, which is generally used less frequently, in a tongue-out switching member at a special position different from the other operation members (usually inoperable). Position), erroneous operation by the photographer can be prevented.

[Brief description of the drawings]

FIG. 1 shows a reference example of the present invention, and is a perspective view of the inside of a camera.

FIG. 2 is a circuit diagram showing a reference example of the present invention.

FIG. 3 is a plan view showing one embodiment of the present invention.

FIG. 4 shows one embodiment of the present invention, and shows VII-VI in FIG. 3;
FIG. 3 is a sectional view taken along line I.

[Explanation of symbols]

 P: patrone F: film 1a: camera body 5: film winding mechanism 6: film rewinding mechanism (rewinding means) 9: back cover (lid) 45: film detection switch (detection means) 46: detection pin (detection) Means) 47 Switch (operating means) 55 Screw (operating means)

Claims (2)

(57) [Claims] 1. A rewinding means for rewinding a film to a patrone; a detecting means for detecting whether a predetermined portion of the film protrudes from the patrone by a predetermined amount; Operating means for selecting whether or not to wind the film into the patrone; andcontrol means for stopping the operation of the rewinding means based on a selection result by the operating means and a detection result of the detecting means. A film rewinding device, which is provided so as to be openable and closable with respect to the camera body and, when in the closed position, accommodates the operating means so as to be inoperable externally. 2. The film rewinding device according to claim 1, wherein said lid is a back lid of a camera.