JPS5838939A - Stopping device for rewinding of camera - Google Patents

Abstract

PURPOSE:To provide a device which can stop rewinding of a film automatically with extremely simple constitution. CONSTITUTION:When an operating knob 45 is moved in an arrow (c) direction to bring an operating plate 43 in an illustrated state, the side face 21c of a stopping lever 21 of winding is pressed by the end part 43c thereof, and the lever 21 is held in the state of turning a switch 22 on by the projecting part 21b thereof. Then a motor 1 is put in a driving state. On the other hand, the movement of the plate 43 is transmitted to an operating plate 38 as well via a transmission lever 40, and further an oscillating lever 32 is turned up to the position of meshing a gear 30 with a gear 33 while receiving the influence of the energizing force of a spring 52. Therefore, the driving of the motor 1 is transmitted with gear groups 5-36 to a fork 37, by which a film 53 is rewound. When the film 53 deviates from a spool 2 and the load on the fork 37 decreases, the plate 38 is moved in the left direction shown in the figure by the energizing force of a spring 51, by which the switch 22 is turned off to stop power supply to the motor 1 and the rewinding motion is terminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rewind stop device for a camera that winds and rewinds a film using an electric motor.

In a camera that uses an electric motor to write and rewind the film, when the electric motor is activated to rewind the film, it is generally started by switching the operating member to rewind mode. Conventionally, in such a camera, when film rewinding is stopped, the operator or the operating member is switched back to the winding mode.

That is, while the operator holds the operating member in the rewind mode side, the electric motor operates to rewind the film, and when the operator releases the holding of the operating member,
The operating member is configured to automatically return to the winding mode l1IIK and stop driving the electric motor;
When an operator switches the operating member to rewind mode, the operating member is locked in that position to continue the rewinding operation, and the operator releases the lock to stop the rewinding. However, with such a conventional configuration, in the case of a line-up person, one operator must always hold the operating member in the rewind mode side during the praying motion, which causes pain in the fingers. There is a drawback that, and in the case of a % winner,
To stop rewinding, the operator must release the lock, so if the operator does not check the rewinding status of the film, the motor will continue to drive even after all the film has been rewound into the cartridge. However, this had the disadvantage of draining the battery and causing the camera to heat up. Furthermore, in such a rewinding device, in order to notify the operator that rewinding has been completed, it is necessary to reverse the film counter in conjunction with the rewinding operation of the film, and the structure is complicated.
'4. However, in order to eliminate the drawbacks of the rewinding device, a detection member was developed that is in contact with the end surface of the film when the C1 film comes off the spool and is rewound halfway through the aperture in the rewinding mode. A device is known that operates a motor to stop power supply to an electric motor (channels 1 to 3). That is, the device is constructed like a doctor and is slender, as shown in the figure. 101 is a cartridge for storing the film 102, 103 is a sprocket, and 104 is a spool. A detection member 105 is guided by a guide pin 108 and is slidable, and is biased by a spring 106 so that the end of the film 102 comes into contact with the detection member 105. It is configured to switch. This round, film 1
020 When the rewinding operation is performed and the film 102 is in the state shown in the second figure, the detection member 105 slides in the direction of the arrow and turns off the switch 107, so that the power is not supplied to the electric +lfi 112 as shown in the third factor. will be stopped.

Therefore, when the film 102 is rewound with a predetermined amount remaining in the cartridge 101, the electric motor 112 is stopped and the film rewinding operation is completed. In addition, in Figure 11g3, E is the power supply, and 110 is the electric motor 112 at the time of winding.
The switch 111 controls the power supply to the electric @112 when the back cover of the camera is open and the film 112 is not loaded. Such devices have the following drawbacks. That is, since the film +M is constantly pressed by the detection member, the flatness of the film deteriorates, and when the film is wound up or rewound, the detection member and the film come into contact with each other, which increases the load. there were. Unfortunately, with this device, if there is only a switch on the detection member, the power supply to the motor will be disabled when there is no film loaded, so there is a switch that is turned on when the back cover is open. The switch had to be installed in parallel with the above-mentioned switch, which made the camera's electrical circuit complicated.The present invention is a new camera rewind stop device that eliminates all the deficiencies of the conventional device. This is what we are trying to provide.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 4 shows the drive circuit of the motor 1 in the embodiment of the present invention (6). In this figure, E is the power source
Reference numeral 2 denotes a switch which is switched by a winding lever 21 which will be described later. FIG. 5 is a perspective view showing an embodiment of the present invention. In this figure, l is a motor serving as a drive source for winding and rewinding the film 53 as described above, 2 is a spool, and 3 is a motor that drives the spool 2. It is a gear for this purpose, and is connected by a frikshi string. 4 is an output shaft of a motor 1, and a gear 7 and a meshing gear 5 are fixed to the tip thereof. This gear 7 is installed in the camera body (not shown), is rotatably supported by nine supporting shafts 8, and is interlocked with the gear 9 and the gear 28. ◇1O is a gear that rotates integrally with the gear 9. The two-stage gear made up of the gears 9 and 10 is rotatably supported by a support shaft 11 implanted in a swing lever 12 which is swingably supported by the support shaft 8. Also,
The swing lever 12 is biased clockwise by a spring 50. Reference numeral 17 denotes a bracket that meshes with the gear 10, and a zero-tooth single 13 that is fixed to a rotating wheel 16 that fixes the gear 13 to one end.
meshes with gear 3 and gear 14, and connects spool 2 via gear 3 and sprocket 15 via S-table 14i.
rotate in the same direction. 19 is a well-known one-way club, and only when the rotating shaft 16 rotates clockwise, the 121! The IdJ force is transmitted to the rotation shaft 20. 24 is a charge cam, 27 is a winding cam, and both cams rotate integrally with the rotating shaft 20. 025 is a charge lever that swings around the support shaft 25 by the charge cam 24. The running plate 46 is urged in the direction of the hour hand, and the protrusion glr 46m of the running plate 46 engages with its one side 25a.The running plate 46 starts running when the camera is released, and an automatic It controls the focus adjustment mechanism and the shutter mechanism, and when it is moved by the charge lever 25 and others against the biasing force of the spring 47, the automatic focus adjustment mechanism and the shutter mechanism are brought into a ready state for photographing. It is something to do.

Next, 21 is swingably supported by the support shaft 18, and
The winding lever 21 is biased counterclockwise by a spring 23.
7a, and a protrusion 21b for switching the ON/OFF state of the switch 22 described above. The part 46b comes into contact with the running plate 46 when it completes running, and is rotated clockwise. Reference numeral 032 is a swinging lever that is swingably supported by a support shaft 29 that rotatably supports teeth 4284, and is supported by a spring. O33 is biased in the counterclockwise direction by 52 and rotatably supports a gear 30 that meshes with the m console 28 via a support shaft 31. When the camera is set to rewind mode, the gear 3 A fork 37t, which is engaged with a winding shaft of a cartridge (not shown) through gears 34, 35, and 36, is driven by a gear meshing with the fork 37t. 38 is an actuation plate, and this actuation plate 38 is connected to the support shaft 3 through grooves 38 a f.
9, and is biased toward the left in the figure by a spring 51. Further, the actuation plate 38 is formed with a protrusion 538b that engages with the end 12a of the swing lever 32, and a protrusion 38c that engages with the end 32a of the swing lever 32. , and the movement!IIIK is adapted to displace the rotational position of the gear 9jIL and the gear 30. Reference numeral 43 denotes a rewind operation plate, which is slidable in the direction of arrow C by an operation knob 45.
l143a is fitted with the support shaft 44, and its end @
43c is configured to be able to engage with the side surface 21c of the wind stop lever 21. Furthermore, in this operation plate 43, the 4
3C is a protrusion for fixing the operation knob 45; 0 and 39 are transmission levers (-) for transmitting the operation of the operation plate 430 to the operation plate 38; this transmission lever is rotatably attached to the support shaft 40; #39a is supported by the actuating plate 38
The groove 39b fits into the bottle 41 installed in the operation plate 43.
Km is fitted into the bin 42 provided therein.

Therefore, the movement of the operating plate 38 is different from the moving direction of the operating plate 43, and is carried out in the left direction.Next, the operation of the embodiment configured in this way will be explained. I will explain about it.

FIG. 5 shows a state in which the winding is completed. From this state, when the not-illustrated V release button t* is pressed to start the traveling plate 460, the not-illustrated automatic focus adjustment mechanism and shutter mechanism are activated by the traveling plate 46. The photographing operation of the camera is then completed. After this, the end 4'6 of the running plate 46
bFi engages with the side surface of the winding stop lever 21, and the winding stop lever 21
is rotated clockwise by the biasing force of the spring 47. As a result, the winding stops/(-21C) protrusion 21 and the winding stop cam 2
7 is released from the notch 27m, the gear 17 becomes rotatable in the direction of the arrow, and the protrusion 21b switches the switch 22 to the ON side, so the motor 1 starts driving. At this time, since the gear 17 and the gear 10 are meshed, the driving force of the motor 1 is transmitted to the gears 5, 7,
9.10 to the gear 17, and both wheels 17 rotate in the direction of the arrow.
3 also rotates in the direction of the arrow, the spool 2 and sprocket 15 also rotate in the direction of winding the film 53t. Further, this rotation of the gear 17 in the direction of the arrow is transmitted to the rotation shaft 20 via the one-way clutch 19, and rotates the charge cam 24 and the stop cam 27. As a result, the charge lever 25 is rotated by the spring 49. , and returns the running plate 4G to its initial position, thereby making the shutter mechanism in the autofocus joint groove mechanism again ready for photographing. At 0, the running plate 46 Due to the return movement, the contact between the end 46b of the running plate 46 and the side surface 21C of the wind stop lever 21 is released, but at this time, the notch 27a of the wind stop cam 27 touches the protrusion of the wind stop lever 21. 21a, the winding lever is held in a position where its protrusion 21b turns on the switch 22. Therefore, the motor 1 is connected to the running plate 46
is returned to the initial position, the winding stop cam 27 rotates once, and the notch 27! The winding is stopped when the protrusion 21a of the winding stopper 21 is reattached.

Further, since the sprocket 15 is designed to feed the film 53 frame by frame when the one-roll stop cam 27 rotates once, the preparation for photographing the film 53 is completed at this time.

Note that the p-fork 37 also rotates in the direction of the arrow as the film 53 is wound up, but at this time the gears 30 and 33 are not in mesh with each other, so there is no problem with the winding operation.

Next, by moving the operating knob 45 in the direction of arrow C' from the state shown in FIG. 5, which explains the rewinding operation,
When the operation plate 43 is shaped as shown in the sixth figure, its end 43c
The side surface 21c of the wind stop lever 21 is pressed, and the protrusion 21b of the wind stop lever 21Fi turns the switch 22 to O.
It is held in the position of the N-shaped corridor. As a result, the motor 1 is brought into a driving state. On the other hand, the movement of the operating plate 43 is also transmitted to the operating plate 38 via the transmission lever 40, so the operating plate 38 moves toward the right direction against the biasing force of the spring 51, and the swinging lever 12 and 32 is rotated counterclockwise around the respective support shafts 8 row 1 (29t). This dark, oscillating rail <-12 is rotated while resisting the biasing force of the spring 50 to engage the gear 17 and the gear lO. At the same time, the m movement bar 32 is rotated to a position where the gear 30 is engaged with the gear 32 under the influence of the biasing force of the spring 52. Therefore, the drive of the motor l is , gear 5
．． 7, 28, 30, 33, 34, 35, 36 to the fork 37, and drives a winding shaft in a cartridge (not shown) to return the film 530e. Also,
During this time, spool 2 and sprocket 15
rotates in the direction of the arrow, causing the rotation shaft 16 to rotate clockwise, but this is not transmitted to the rotation wheel 20 by the one-way clutch 19. Therefore, the charging cam 24 and the winding stop cam 27 are not operated, and the running plate 46 is not charged.

By the way, during the rewinding operation of the film 530, the swing lever 3
2, in the direction of releasing the meshing of the gears 30 and 33;
The biasing forces of the springs 50 and 510 act through the actuating plate 38, but in this case, the resultant force of the meshing force of the gears 30 and 33 and the biasing force of the spring 52 is stronger than the biasing force of the springs 50 and 510.
Since the force is greater than the resultant force of the two urging forces, the gears 30 and 33 remain engaged until the rewinding is completed. This state will be explained in detail below with reference to FIG. In this figure, %28' is the base circle of gear 28, 30' is the base circle 1 of gear 300, and O' is the base circle of gear 33, and the rotation direction of each gear is 1. J, at the same time, the driving force of the motor 1 is transmitted to the gear 28, and the gear 30 is supported by the swing lever 32 so that the gear 28
As mentioned above, the robot is designed to move loosely around the . By the way, since the rotation direction of the gear 28 is I, an acting force is generated on the gear 30 in the direction in which the gear 28 and the gear 30 mesh. This is shown as R in gear 30. Also, considering the force with which the 7th wheel 37 winds the film 53, since the film 53 is wound around the spool 2, the spool 2 and the camera body fit together, and the gear 3 and the gear 13 are engaged. It can be seen that a large load is applied to one fork 37 due to the frictional force of the sprocket 15, the frictional force between the film 53 and the camera body, etc.

On the other hand, since the gear 33 is driven by the gear 30, the load on the first pulley 37 is reduced in the direction in which the gear 33 stops the rotation of the gear 300. Therefore, an acting force is generated on the gear 30 in the O direction as the above-mentioned load 0 reaction force.
On the gear 30, the acting force Q is 0 and the force shown as Q.
increases in accordance with the load applied to the fork 37. Therefore, during the unwinding of the film 53, an acting force S, which is the resultant force of the acting forces a and Q, acts on the rotation center Y of the gear 300. Therefore, this acting force S and the spring 52. Of the resultant force of the biasing force of the spring 50 and the force of the spring 51, the component force that attempts to rotate the swing lever 32 counterclockwise is the component force of the resultant force of the biasing force of the spring 50 and the knob 51 that rotates the swing lever 32 clockwise. I set it so that it is greater than the force I am trying to move, and I am rewinding one film 530 times.

The meshing state of gear 30 and gear 33 is maintained.

Furthermore, when the film 53 is detached from the spool 2, the load acting on the flap 37 becomes extremely small, and the acting force Q5 becomes extremely small.
is also extremely small, so the swing lever 32 is rotated in the direction of the hour hand by the resultant force of the springs 50 and 51, and the gear 30
When using this machine 411I, gears 2g and 30 will be disengaged from each other.
.

It is necessary to consider the arrangement of 33, and the rotation center of each gear
-If the angle θ・ between Y and Z is not a very obtuse angle, the acting force S
does not act in the direction that makes the gear 30 engage the gear 33, and if 1l = 180°, the gear 30 rotates around the gear 2B like a lucky gear and cannot maintain engagement with the gear 33. . In this embodiment, this angle 0 is set to approximately 150°, but it has been confirmed that the meshing of the gears 30 and 33 can be maintained without any problem if the angle θ is between 120° and 1700°. ,
When the film 53 comes off the spool 2 and the load on the fork 37 decreases, the actuating plate 38 is moved from the #% position in FIG. 6 to the left in the figure by the biasing force of the spring 51. Therefore, the operation plate 43 moves to the right in the figure via the transmission lever 40, so the first winding stop lever 21 is moved to the right in the figure.
Due to cK, it is no longer pressed, and the wind stop lever 21 is moved to the protrusion 21.
Rotate the winding stop cam 270 to a position where it engages with the notch 27a. As a result, the switch 22 is turned off,
Stop the power supply to the motor l and complete the one-winding rewind operation. At this time, the swing levers 12 and 32 also rotate clockwise in the sga diagram, so the gear 30 and the gear 33
12) As the meshing is released, 117 and gear 10
become engaged again.

Nine, the notch part 27a of the winding stop cam 27 is connected to the winding stop lever 2.
If the switch 22 is in a position where it does not engage with the protrusion 21a of No. 1, the switch 22 remains in the O position even after the operation plate 43 moves to the right in the figure.
The motor 1 is driven even after the film 530 has finished rewinding, and the gear 10 and the gear 1 are kept in the N state.
-C unwinding cam 27t- is rotated through 7, and its notch 2
7a and the winding stop lever 21C1, it is stopped.

In addition, in this embodiment, the film 5 is
However, the present invention can also be applied to a so-called spool drive camera in which the spool 2 winds the film 53t and the sprocket 15 is used only for indexing and charging the film 53. It is.

Next, 118 v4 shows another embodiment of the present invention, in which the position of the gear is displaced in a plane by a swing lever, whereas in the embodiment described above, the position of the gear is changed by rotating. The difference is that it is displaced vertically by sliding on the shaft. That is, in this figure, 20
0 is a gear driven by a motor (not shown), 201
is rotatably supported by the support shaft 205, and the support shaft 2
A transmission gear slidable along 05; 202 a gear for transmitting power to the film winding system; 203 a gear for transmitting power to the wire film rewinding system; It is a biasing spring. In this figure, when the film is being rewound, a large load is applied to the wheel 203 as described above. Therefore, during rewinding of the film, the frictional force generated between gear 201 and gear 203 becomes stronger than the biasing force of spring 204, and holds gear 201 in the illustrated position. However, when the rewinding is completed, the gear 201 is moved downward in the drawing by the biasing force of the spring 204, and the gear 201 is disengaged from the gear 203.

This will be explained below using Figures 9, 10. In this figure, a large load is acting on the gear 203, and the teeth 201' of the gear 201 are about to rotate the teeth 203' of the gear 203 in the direction of the arrow. Therefore, the load acting on the gear 203 acts as a drag force M on the gear 201, and a friction force y produced by this drag force M and the friction coefficient is exerted between the teeth 201' and the teeth 203' by the spring 204.
When the load is large during rewinding, the frictional force V is larger than the urging force of the spring 204, and when the rewinding is finished, the frictional force M If ' is made smaller than the biasing force of the spring 204, the gear 201 can be moved as described above.

As described above in detail, one aspect of the present invention is to provide a driving means for winding and rewinding the film by being switchably connected to the film winding thread and the rewinding system, so that the load acting on the rewinding system is reduced and Since the structure is configured so that the rewinding system is switched and connected to the winding system, film rewinding can be reliably automatically performed without adversely affecting the flatness of the film or increasing the load during winding and rewinding. Can be stopped. Further, according to the present invention, it is possible to automatically stop film rewinding with an extremely simple configuration, and such a device can be provided at low cost.

[Brief explanation of drawings]

1 and 2 are perspective views showing a conventional automatic rewind stop device, and FIG. 3 is a circuit diagram showing a motor drive circuit of the device shown in FIGS. 1 and 2. FIG. %s4 is an embodiment of the present invention 5 and 6 are perspective views showing one embodiment of the present invention, and FIG. 7 is a circuit diagram showing the meshing state of the gears in the embodiment shown in FIG. 5.6. Figure E and Figure 8 are cross-sectional views showing the @ embodiment of the present invention;
FIG. 9 is a plan view for explaining the meshing state of gears in the embodiment shown in FIG. 48, and FIG. 10 is a portion vfr of FIG. 9.
It is a front view. DESCRIPTION OF SYMBOLS 1... Motor, 2... Spool, 21... Winding stop lever, 22... Switch, 24... Charge cam, 27... Winding stopping cam, 30... Gear, -32...・
・Swinging lever, 33...gear, 37-...fork,
38... Operating plate, 43... Operating plate, 53... Film. ,! -4 Figure 3 Male Figure 4

Claims (1)

[Claims] 7. A driving means for winding and rewinding the film, which is switchably connected to the film winding system and the film rewinding system, and an urging means for urging the driving means in the direction of the thread. The film rewinding system is actuated by the driving means, and when the film is being rewound, the driving means is caused to resist the urging force of the urging means by the load acting on the film rewinding system. It is configured so that it is connected to the film rewind system.
A camera rewind stop device.