JPH07261251A - Camera provided with differential transmission means - Google Patents

Abstract

PURPOSE:To provide a camera capable of more efficiently feeding a film by making the feeding action of the film smooth and its running stable. CONSTITUTION:A ball differential gear 3 as a differential transmission means capable of simultaneously distributing the driving force of a motor 1 to two means to be driven is provided so that each driving force is transmitted to two means to be driven of a spool shaft driving means and a cartridge shaft rotating means respectively. The spool shaft driving means has a planetary gear means as a switching means changing over one driving force from the ball differential gear 3 to a spool shaft or a fixing gear as a stopping member for stopping the transmission of the driving force and the switching means is controlled to switch to the fixing gear when a cartridge shaft is driven in a rewinding direction. Then, a rotation blocking means blocking the rotation of the spool shaft is provided and the transmission of the driving force after being switched to the spool shaft by the switching means at the time of automatically loading is blocked as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a differential transmission means, and more particularly to a camera having a differential transmission means adapted to simultaneously distribute a driving force from one motor to two driven means. Is.

[0002]

2. Description of the Related Art Conventionally, in a camera or the like that uses a roll film containing a 35 mm width cartridge, the cartridge shaft in the film cartridge is rotatably driven by rotatably driving a spool shaft provided in the spool chamber of the camera body. To wind the film wound on the film, and rewind the film wound on this spool shaft into the cartridge, use the rewinding fork provided in the camera's cartridge chamber to rotate the film cartridge's cartridge shaft. A film feeding mechanism in which the film wound around the spool shaft is rewound into the film cartridge is generally put into practical use. Such a film feeding mechanism has a film winding side, that is, a spool shaft side at the time of film winding,
When the film is rewound, the film patrone shaft side is driven to rotate, so that the film winding side, that is, the film patrone shaft side when film is wound up, and the spool shaft side when film is rewound are driven to wind up the film. And rewinding film feeding.

On the other hand, as a differential transmission means, a differential gear mechanism composed of, for example, a bevel gear has been put to practical use. The basic structure of this differential gear mechanism will be described with reference to the enlarged side view of the essential portions of FIG. As shown in FIG.
The rotational driving force of the motor 101 is transmitted to the input gear 103a meshing with the gear 102 provided at the tip of the output shaft of the motor 101. In the middle of the input gear 103a, a bevel gear 103b having a rotation axis in a direction orthogonal to the rotation axis of the input gear 103a is rotatably supported. The rotation direction of the input gear 103a is changed by 90 ° by the bevel gear 103b.

The bevel gear 103b meshes with a bevel gear 103c arranged on the upper side and a bevel gear 103d arranged on the lower side, and the bevel gear 103e on the upper side is
Via the driven gear 103e arranged coaxially with this,
Further, the lower bevel gear 103d is connected to the motor 10 through a driven gear 103f arranged coaxially therewith.
One driving force is transmitted to each of the two driven means.

In the differential gear mechanism thus constructed, the upper bevel gear 103c and the driven gear 103 are arranged above.
When the load applied to the driven means side transmitted via e is the same as the driven means side transmitted via the lower bevel gear 103d and the driven gear 103f, the driving force of the motor 101 is , The input gear 103a is rotated, and at the same time, the bevel gear 103b is rotated by the input gear 103.
Since it revolves around the rotation shaft of the input gear 103a with the rotation of a, the upper bevel gear 103c and the lower bevel gear 103d that mesh with the bevel gear 103b are moved in the same direction as the input gear 103a. Rotate to. Therefore, the rotation speed of the input gear 103a and the upper bevel gear 103c
And the driven gear 103e and the lower bevel gear 103 described above.
The d and the driven gear 103f rotate in the same direction at the same rotation speed.

Further, the driven means side transmitted through the upper bevel gear 103c and the driven gear 103e,
When the load applied to the driven means side transmitted via the lower bevel gear 103d and the driven gear 103f is different, the upper bevel gear 103c and the driven gear 1 are
03e and the lower bevel gear 103d and the driven gear 103f differ in rotation speed, so that the bevel gear 103b starts to rotate. Thereby, the bevel gear 1
The difference in rotational speed between the bevel gear 103c on the upper side and the bevel gear 103d on the lower side meshing with 03b is absorbed.

At this time, the relationship between the rotational speeds of the respective gears is that the rotational speed of the input gear 103a = Na, the rotational speed of the upper bevel gear 103c and the driven gear 103e = Ne, and the lower bevel gear 103d and the driven gear 103f. When the number of rotations of N = Nf, then Na = 1/2 (Ne + Nf). As described above, the rotational driving force of the motor 101 is differentially driven by the driven gears 103e and 103f.
Each of them is simultaneously transmitted to the two driven means.

An application of such a differential gear mechanism to a film feeding device of a camera is disclosed in, for example, Japanese Patent Laid-Open No. 58-1.
It is a film electric hoisting device disclosed by Japanese Patent No. 18625. In this system, the drive output of the motor is transmitted to the sprocket and the winding spool shaft of the camera via the differential gear mechanism, and these are rotationally driven differentially.

An electric film rewinding device disclosed in Japanese Utility Model Laid-Open No. 58-105533 has a mechanism similar to the means disclosed in Japanese Patent Laid-Open No. 58-186625, and when rewinding a film. The transmission of the driving force to the sprocket is cut off, and the drive output of the motor is made into two differential rotation outputs by the differential gear device, which are simultaneously supplied to the spool shaft and the rewinding shaft to rotate the rewinding shaft in the rewinding direction. It was done like this.

[0010]

However, the conventional film feeding mechanism described above, that is, a film feeding mechanism in which the side around which the film is wound is rotationally driven and the side around which the film is wound is driven. In the mechanism, since the spool shaft side is driven and the patrone shaft side is driven at the time of film winding, the driven side, that is, the gear train for driving the patrone shaft is loaded. There is a drawback that it becomes. Further, the amount of pull-out force of the film is influenced by the type of the film, the environmental temperature, etc., so that there is a problem that the fluctuation of the film winding load becomes large. Furthermore, during film winding, the film cartridge having the patrone shaft on the driven side is pulled by the film wound on the spool shaft, and the film delivery opening of the film cartridge is taken up together with the film on the camera body. There is a problem that the film is pulled out to the side of the film feeding path, that is, a so-called neck hanging state occurs, and the amount of pulling power of the film becomes excessive.

On the other hand, in the film feeding device to which the differential gear mechanism described with reference to FIG. 12 is applied, since the driving force is transmitted by the bevel gear, the differential torque in the differential transmission mechanism can be adjusted. There is a drawback that it is difficult, and when performing film winding operation, when there is an impact when stopping at the film end part (film end) immediately before the end of winding or when there is an abnormality in film feeding, A large load is applied to the film, which may cause a defect such as scratching the film or cutting the film.

According to the means disclosed in JP-A-58-118625 and JP-A-58-105533, the sprocket and the spool shaft are driven differentially. At the time of film winding operation, since the film is pulled out from the film cartridge and the cartridge shaft is driven,
There is a problem that a stable film winding cannot be performed.

An object of the present invention is to increase the efficiency by smoothly performing the film feeding operation during the film winding and rewinding, and the automatic loading (automatic feeding), and the stable film running. SUMMARY OF THE INVENTION It is an object of the present invention to provide a camera having a differential transmission means for performing film feeding.

[0014]

A camera having a differential transmission means according to the present invention is a camera having a differential transmission means capable of simultaneously distributing a driving force from one motor to two driven means. Of the two driven means, one driving force is transmitted to the spool shaft driving means that drives the spool shaft that winds the film, and the other driving force rotates the patrone shaft rotating means of the loaded film patrone. Further, the spool shaft driving means switches the one driving force from the differential transmitting means to the spool shaft or a stop member for stopping the transmission of the driving force. The switching means is controlled so as to be switched to a stop member when the patrone shaft is driven in the rewinding direction. That.

And, it has a rotation blocking means for blocking the rotation of the spool shaft, and the rotation blocking means blocks the transmission of the driving force switched to the spool shaft by the switching means during the automatic loading. It is characterized by

[0016]

The single motor provided in the camera body is driven, and the driving force is simultaneously distributed and transmitted to the two driven means by the differential transmission means. Of these two driven means, one driving force is transmitted to the spool shaft driving means for driving the spool shaft for winding the film, and the other driving force rotates the patrone shaft of the film patrone loaded in the camera body. It is transmitted to the patrone shaft rotating means.

The switching means of the spool shaft drive means switches one driving force from the differential transmission means to the spool shaft or a stop member for stopping the transmission of the driving force.
Further, the switching means is controlled to be switched to the stop member when the patrone shaft is driven in the rewinding direction.

At the time of auto-loading, the rotation blocking means provided for blocking the rotation of the spool shaft blocks the transmission of the driving force switched to the spool shaft by the switching means to automatically transfer the drive force. Loading (automatic feeding) is performed.

[0019]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a side view of essential parts showing a film feeding mechanism of a camera having a differential transmission means according to a first embodiment of the present invention.

As shown in FIG. 1, a motor 1 is provided in a camera body (not shown) for feeding a film, and a gear 2 is provided on a rotation shaft of the motor 1. . The gear 2 meshes with a drive gear 3a of a ball diff 3 which is a differential transmission means using a ball bearing, so that the driving force of the motor 1 is two driven means via the ball diff 3. The film winding mechanism and the rewinding mechanism are simultaneously distributed and transmitted.

Now, the ball differential 3 which is the differential transmission means of the first embodiment of the present invention will be described. Figure 2
(A) is an enlarged vertical sectional view of an essential part of the ball diff 3 described above,
FIG. 6B is a detailed view of only the drive gear 3a of the ball diff 3 seen from the upper surface. As shown in FIGS. 2A and 2B, the ball diff 3 is provided with a drive gear 3a having a plurality of groove portions for accommodating the ball bearings 3b and a friction plate 3e for sandwiching the drive gear 3a from the vertical direction. One is provided on each of the upper side and the lower side of the drive gear 3a. That is, the ball bearings 3b are housed in a plurality of groove portions provided in the drive gear 3a,
The friction plate 3e sandwiches the drive gear 3a from above and below to give friction to the ball bearing 3b. By adjusting the strength of friction and the friction coefficient μ of the friction plate 3e at this time, the differential torque in the differential transmission mechanism can be adjusted.

Further, driven gears 3c and 3d are respectively engaged with the friction plate 3e at the center of rotation on the upper side and the lower side of the friction plate 3e, and the driven gears 3c and 3d.
When rotating, the friction plate 3e also rotates. A shaft 3g is rotatably supported at the center of rotation of the driven gears 3c and 3d.
Flange portions are provided on the upper and lower portions of the above so as to regulate the movement of the drive gear 3a and the driven gears 3c and 3d in the thrust direction.

Further, a corrugated plate spring 3f is sandwiched between the friction plate 3e provided on the upper side of the ball diff 3 and the driven gear 3c, and between the ball bearing 3b and the friction plate 3e. The generated frictional force is kept constant. The differential torque in the differential transmission mechanism can also be adjusted by changing the elastic force of the corrugated leaf spring 3f.

With the ball diff 3 thus constructed, the driving force of the motor 1 is simultaneously distributed to the two driven mechanisms. That is, as shown in FIG.
One (upper) driven gear 3c of the ball diff 3 is connected via a gear train 4 to a film winding mechanism having a spool shaft of a spool 5 for winding a film, which is a spool shaft driving means. The other (lower) driven gear 3d of the ball diff 3 has a gear train 6
It is connected to a film rewinding mechanism which is a patrone shaft rotating means having a fork portion 7 for rewinding the film by engaging a patrone shaft (not shown) in the film patrone loaded in the patrone chamber of the camera body. There is. Therefore, as described above, the driving force of the motor 1 is distributed by the ball diff 3 and then decelerated by the gear trains 4 and 6, respectively, and the film winding mechanism side having the spool shaft of the spool 5 and the fork portion 7 are also provided. It is transmitted simultaneously to the two driven means on the film rewinding mechanism side having the.

The film winding and rewinding operations are performed by the spool shaft of the spool 5 and the fork portion 7.
It is carried out by simultaneously driving the patrone shaft that engages with. At this time, the difference between the winding thickness of the film wound on the spool shaft of the spool 5 and the winding thickness of the film wound on the cartridge shaft engaging with the fork portion 7, and the spool shaft of the spool from the ball differential 3 to the spool 5 Due to the difference between the speed reduction ratio of the gear train 4 and the speed reduction ratio of the gear train 6 from the ball diff 3 to the patrone shaft engaged with the fork portion 7 and the like.
There is a difference in peripheral speed between the Patrone shaft and the
This peripheral speed difference is automatically adjusted by the differential operation of the ball differential 3.

FIG. 3 shows a block diagram of a camera having the differential transmission means of the first embodiment constructed as described above. As shown in FIG. 3, a control circuit 50 including, for example, a CPU is provided in the camera body to control the entire system, and a film feeding drive circuit 51 connected to the control circuit 50 is used. The drive control of the motor 1 is performed, and the film winding and rewinding mechanism is driven to feed the film. A photoreflector drive circuit 53 is connected to the control circuit 50. The photoreflector drive circuit 53 detects a perforation of the film and counts the film winding amount by detecting the film perforation, for example.
R) 54 and the like are controlled.

Then, the winding switch 1 is provided on the camera body.
(SW1) and rewind switch 2 (SW2) are provided and connected to the control circuit 50. The winding switch 1 (SW1) is a switch that sends a signal for starting the film winding, and the rewinding switch 2 (SW1).
2) is a switch that sends a signal for starting the rewinding of the film.

The film winding operation and rewinding operation of the camera having the differential transmission means of the first embodiment thus constructed will be described below with reference to the flow charts of FIGS. 4 and 5. FIG. 4 is a flow chart showing the operation at the time of winding the film. For example, the winding amount of one frame of the film is determined by the photo reflector (P
R) 54 is controlled by the detection signal. Further, FIG. 5 is a flow chart showing the operation at the time of rewinding the film, and the photo reflector (PR) 5
If the pulse signal is not input within a predetermined time after the input of the detection signal 4 is cut off, the motor 1 is turned off.

First, at the time of film winding, as shown in FIG. 4, the film winding switch 1 (SW1) provided in the camera body is turned on (ON) ((S100), where S is The operation steps are shown below.
Then, the photo reflector drive circuit 53 is turned on (O
N) and (S101), and the driving of the motor 1 in the film winding direction (here, the forward rotation direction) is started (S102).

In step S101, the photo reflector drive circuit 53 is turned on (ON), and in step S102, the motor 1 is driven to start film winding. Therefore, the photo reflector (PR) 54 is The film winding amount is detected by reading the pulse information, for example, the perforation of the film (S103). When the photoreflector (PR) 54 reads a pulse (perforation) for one frame of film (S10).
4) The film feeding drive circuit 51 and the motor 1 are turned off (OFF) (S105), and the photo reflector drive circuit 53 and the photo reflector 54 are also turned off (OFF) (S106), and a series of film winding processing is performed. End (RETURN).

Next, when rewinding the film, as shown in FIG. 5, the rewinding switch 2 (SW2) provided on the camera body is turned on (S200). Then, the photo-reflector drive circuit 53 is turned on (S101), and the motor 1 starts driving in the film rewinding direction (here, the reverse rotation direction) opposite to the film winding direction (here, the reverse direction). S201).

In step S101, the photoreflector drive circuit 53 is turned on (ON), and in step S201, the motor 1 is driven to start rewinding of the film. Therefore, the photoreflector 54 is pulsed. The amount of film rewinding is detected by reading information, for example, the number of perforations of the film being rewound (S202).

When no pulse signal is input for a predetermined time after the predetermined pulse information (perforation) up to the film end (END) is detected by detecting the perforation of the film by the photo reflector 54, that is, the film Is rewound to the Patrone shaft side and the tip of the film wound on the spool shaft of the spool 5 comes off, so that the spool shaft becomes in an unloaded state and spins idle, the rotational drive torque is transmitted to the Patrone shaft side. It disappears (S203). Then, the film feeding drive circuit 51 and the motor 1 are turned off (S105), and the photo reflector drive circuit 53 is further turned on.
Also, the photo reflector 54 is turned off (S).
106), and a series of film rewinding process ends (RE
TURN).

As described above, according to the first embodiment, the spool shaft of the spool 5 and the patrone shaft engaged with the fork portion 7 are simultaneously driven by the ball differential 3 which is the differential transmission means, to drive the film. Since the film is wound and rewound, the film can be wound up by the spool shaft and the film can be sent out by the cartridge shaft when winding the film, and the film can be rewound by the cartridge shaft and the film can be rewound by the spool shaft when rewinding the film. Since and are performed at the same time, efficient film feeding can be performed. In other words, the driving force is transmitted to both the spool shaft and the cartridge shaft during film feeding, so the tension applied to the film is always constant, the film running is stable, and the flatness of the film surface is improved. The film can be efficiently fed.

Further, when rewinding the film, it is possible to leave the leader portion of the film slightly from the entrance of the patrone without winding the film into the patrone without controlling by detecting the position of the film. Becomes

That is, at the time of rewinding the film, if the rotation driving torque is not transmitted to the patrone shaft side, the patrone shaft also stops rotating, and at this time, the leader portion of the film enters the patrone. The rewinding process is stopped while the film is not caught and remains at the entrance of the cartridge. It should be noted that by stopping the rewinding while leaving the leader part of the film at the entrance of the film cartridge, the entrance of the film cartridge will be shielded from light, so there is an effect of preventing unnecessary exposure to the film already taken. .

Further, by applying the ball diff 3 using a ball bearing as the differential transmission means, it also serves as a friction clutch, and the impact force at the film end (film end) at the time of film winding and abnormal film feeding. The ball diff 3 can absorb an overload applied to the film when the above occurs.

FIGS. 6 and 7 are views showing a main part of a film feeding mechanism for performing a film winding and rewinding mechanism of a camera having a differential transmission means according to a second embodiment of the present invention. Shows a side view of the main part of this mechanism, and FIG. 7 shows a top view of this mechanism. The second embodiment has the same mechanism as that of the first embodiment described above, but the driving force is transmitted to the spool shaft of the spool 5 which constitutes the film winding mechanism in the film feeding mechanism of the first embodiment. A planetary gear unit that is a drive force switching unit is provided in the gear train 4 to enable switching of the transmission route of the drive force transmitted from the motor 1. Therefore,
The description of the same constituent members as those in the first embodiment described above is given the same reference numerals because the description thereof is duplicated, and only different portions will be described below.

As shown in FIGS. 6 and 7, the planetary gear means is used to transmit the driving force between the ball differential 3 and the spool shaft of the spool 5. That is, the driven gear 3c on the upper side of the ball diff 3 meshes with the two-stage gear 8, and the two-stage gear 8 meshes with the sun gear 9 constituting the planetary gear means. The sun gear 9 and the planetary gear 11 mesh with each other, and the sun gear 9 and the planetary gear 11 are connected by a carrier 10,
Depending on the rotation direction of the sun gear 9, the planet gear 11
Revolves around the sun gear 9.

On the orbit of the planetary gear 11 in the clockwise direction, a two-stage gear 12 is rotatably provided on the camera body, and the two-stage gear 12 is attached to the spool shaft of the spool 5 by a ball differential 3. And a fixed gear which is a stopping member and a blocking means for stopping the transmission of the driving force on the revolution path of the planetary gear 11 in the counterclockwise direction. 13 is fixed to the camera body.

The film winding and rewinding operations of the camera having the differential transmission means of the second embodiment having the above-described structure will be described below. First, at the time of film winding, as shown in FIGS. 6 and 7, the driving force of the motor 1 is transmitted to the ball diff 3 to the two driven mechanisms, as in the camera of the first embodiment. It will be distributed at the same time. Therefore, the driving force of the motor 1 is the sun gear 9 that constitutes the planetary gear means, which is a switching means, from the driven gear 3c on the upper side of the ball differential 3 to the two-stage gear 8.
Rotate clockwise. Then, the planetary gear 11
In FIG. 7, the planet gear 11 revolves clockwise and meshes with the two-stage gear 12. Since the two-stage gear 12 meshes with the gear portion provided at one end of the spool 5, the driving force is transmitted to the spool shaft of the spool 5 to rotate it.

On the other hand, since the driven gear 3d on the lower side of the ball diff 3 transmits the driving force to the Patrone shaft side through the gear train 6, the Patrone shaft (not shown) engaged with the fork portion 7 is not shown. ) Is also driven at the same time.

Next, when the film is rewound, the planet gear 11 revolves counterclockwise in FIG. 7, and the planet gear 11 meshes with the fixed gear 13 fixed to the camera body. Then, the spool 5 of the above ball differential 3
The rotation of the driven gear 3c that transmits the driving force to the spool shaft side is stopped. As a result, all the driving force of the motor 1 is transmitted to the patrone shaft side that engages with the fork portion 7, and the transmission route of the driving force of the spool 5 to the spool shaft is as described above. The planetary gear 11 of the gear means disconnects the gears.

As described above, also in the second embodiment, the same effect as that of the first embodiment can be obtained. Further, in the camera of the first embodiment described above,
The rewinding is completed by leaving the film leader outside the cartridge, but in the second embodiment, by combining the planetary gear means, the film position is detected at the time of rewinding the film. The film can be completely wound into the cartridge without any control. This has an effect that it is possible to easily confirm the photographed film cartridge by winding all the photographed film in the cartridge.

FIGS. 8 and 9 are views showing the essential parts of a film feeding mechanism for film winding and rewinding of a camera having a differential transmission means according to the third embodiment of the present invention.
FIG. 8 is a side view of the main part of this mechanism, and FIG. 9 is a top view of this mechanism. The third embodiment has the same mechanism as that of the second embodiment described above, except that the fork portion which is housed in the film cartridge and which engages with the cartridge shaft around which the film is wound is driven to rotate. ,
The film tip in the film cartridge is sent out of the body of the film cartridge, and the film is automatically loaded using a film-feeding film film cartridge. In addition, a rotation preventing means for preventing rotation of the spool shaft of the spool 5 is added. Therefore,
The description of the same components as those in the above-described second embodiment will be given the same reference numerals because the description thereof will be duplicated, and only different portions will be described below.

As shown in FIGS. 8 and 9, a locking gear 14 is meshed with the two-stage gear 12 meshed with the planetary gear 11 constituting the planetary gear means. The locking gear 14 has a locking claw 14 a, and the locking claw 14 a
By engaging a with the claw portion 15a of the locking plate 15, rotation of the locking gear 14 is blocked. The retaining plate 15 has a holding type plunger 16
The holding type plunger 16 controls the rotation preventing operation by the locking plate 15. Thus, the rotation preventing means for preventing the rotation of the spool shaft of the spool 5 is provided. It is configured.

FIG. 10 shows a block diagram of a camera having the differential transmission means of the third embodiment. In addition, this third
In the embodiment, the configuration is almost the same as that of the camera of the first embodiment described above (see FIG. 3).

As shown in FIG. 10, a control circuit 50 including, for example, a CPU, which controls the entire system provided in the camera body, has a film feeding drive circuit as in the camera of the first embodiment. 51 and a photoreflector drive circuit 53 are connected, and the motor 1 and the photoreflector 54 are controlled. And
In the camera of the third embodiment, the plunger drive circuit 55 is connected to drive the plunger 16.

In addition to the winding and rewinding switches 1 and 2, an auto load switch 3 for sending a drive start signal to the plunger drive circuit 55 in order to perform automatic film loading (automatic feeding). (S
W3) is added and electrically connected to the control circuit 50.

The operation of the camera having the differential transmission means of the third embodiment constructed as described above when the film is automatically loaded will be described below.

The initial state at the start of automatic film loading is the planetary gear 11 constituting the planetary gear means.
However, as shown in FIG. 9, it revolves clockwise and meshes with the two-stage gear 12, and the driving force of the motor 1 is transmitted to the spool shaft of the spool 5. In this state, automatic film loading is started. That is, at the start of automatic film loading, since the film is not wound around the spool shaft of the spool 5 and is in an unloaded state, all the driving force of the motor 1 is transmitted to the spool shaft side of the spool 5. And
The driving force is not transmitted to the side of the cartridge shaft for feeding the film, so that the cartridge shaft cannot be driven. Therefore, it is necessary to transmit the driving force of the motor 1 to the cartridge shaft side by locking the rotation of the spool shaft of the spool 5.

Therefore, first, at the start of automatic film loading, the holding type plunger 16 provided for locking and holding the spool shaft of the spool 5 is energized. When the holding type plunger 16 is energized, the claw portion 15a of the locking plate 15 engages with the locking claw 14a of the locking gear 14. As a result, the rotation of the locking gear 14 is locked, so that the rotation of the two-stage gear 12 meshing with the locking gear 14 is also locked, and the rotation of the spool 5 is also locked by the two-stage gear 12. Therefore, the motor 1
All of the driving outputs of (1) are transmitted from the driven gear 3d of the ball diff 3 to the patrone shaft side that engages with the fork portion 7 via the gear train 6. As a result, the patrone shaft is rotated in the feeding direction of the film, and the leading end portion of the film is fed out of the film cartridge to the outside of the cartridge body.

Auto-loading is performed in this way,
The film position is detected by detecting the perforation detected by the photoreflector (PR) 54 or the like when the tip of the film in the cartridge has been sent to a position where it can be wound around the spool shaft.
When it is confirmed that the leading end of the film has been fed to a predetermined position, the driving of the motor 1 is stopped, and the plunger 16 is energized in a phase opposite to that at the start of the automatic loading described above, and Locking claw 14 of stop gear 14
The engagement between a and the claw portion 15a of the locking plate 15 is released.

Thereafter, similar to the camera of the second embodiment described above, the film winding operation is performed, and further, the film rewinding operation is performed after the photographing is finished.

FIG. 11 is a flow chart showing the film feeding operation and film winding operation when the film is automatically loaded (automatically fed) in the camera having the differential transmission means of the third embodiment. . In addition,
In the third embodiment, the film position at the time of feeding the film and at the time of winding the film is controlled by a detection signal of a photo reflector (PR) 54.

As shown in FIG. 11, when the film is automatically loaded, the auto load switch 3 (SW3) provided on the camera body is turned on (S300). Then, since the plunger drive circuit 55 energizes the plunger 16, as described above,
The spool shaft of the spool 5 is locked by driving the plunger 16 (PULL) (S301), and the photoreflector driving circuit 53 is turned on (S1).
01). Then, the driving of the motor 1 in the film feeding direction (here, the forward rotation direction) is started (S102).

In step S101, the photoreflector drive circuit 53 is turned on (ON), and in step S102, the motor 1 is driven to start feeding the film. Therefore, the photoreflector (PR) 54 is The film winding amount is detected by reading the pulse information, for example, the perforation of the film (S103). Then, when a predetermined amount of pulse is read and sent out from the cartridge to a position where the leading end of the film can be wound around the spool shaft (S302), the film feeding drive circuit 51 is turned off (OFF). Then, the motor 1 is stopped (S105).

Subsequently, the plunger 16 is driven (PUS
By performing H), as described above, energization in the opposite phase is performed and the locking of the spool shaft of the spool 5 is released (S303). Then, the motor 1 starts rotational driving in the film winding direction (normal rotation direction) (S102), and reading of pulse information by the photo reflector (PR) 54 is started (S103).

At this time, the motor 1 winds the leading end of the film around the spool shaft of the spool 5 and stops the winding operation at the first film position where photography is started. That is, for example, when the position where the film for three frames is wound is the first film position of the above-mentioned photography,
When the photoreflector (PR) 54 detects predetermined pulse information of perforations for three frames (S304), the film feed drive circuit 51 is turned off (O).
FF) signal is sent and the motor 1 stops (S105),
Further, the photo reflector drive circuit 53 is turned off (OF
F) A signal is sent and the photo reflector 54 is also stopped (S106). Then, a series of film auto-loading processing is completed (RETURN), and a film winding operation start signal is waited for.

As described above, according to the third embodiment, the spool shaft and the fork portion 7 are simultaneously driven by the ball differential 3 which is the differential transmission means as in the first and second embodiments. Since the film can be efficiently fed, and the peripheral speed difference between the spool shaft and the fork portion 7 is automatically adjusted, the tension applied to the film is constant and the tension is small, so that the flat surface of the film can be obtained. It is possible to improve the sex.

When the film is rewound, the leader portion of the film can be left slightly outside the cartridge without controlling by detecting the position of the film, while the rotation drive of the spool shaft is locked. As a result, the leader portion of the film can be entirely wound in the cartridge.

Further, by locking the rotational drive of the spool shaft, a film feed type patrone can be used to easily perform automatic film loading (automatic feeding).

[Supplementary Note] (1) The driving force from one motor can be divided into a driving force for driving the spool shaft for winding the film and a driving force for rotating the patrone shaft of the loaded film patrone. And a planetary gear unit that switches the driving force from the differential transmission unit to a unit that transmits the driving force to the spool shaft or a blocking unit that blocks the transmission of the driving force. When the Patrone shaft is driven in the rewinding direction, the planetary gear unit and the blocking unit are brought into mesh with each other, and the driving force from the differential transmission unit is only the driving force for rotating the Patrone shaft. A camera having differential transmission means.

In the camera having the differential transmission means, when the patrone shaft is driven in the rewinding direction by the driving force of the motor, the planetary gear means is switched to drive the planetary gear means from the planetary gear and the motor. By engaging with the blocking means for blocking the transmission of the force, the transmission of the driving force to the spool shaft side is blocked, and the driving force from the motor is transmitted only to the cartridge shaft side.

Therefore, at the time of rewinding the film, it is possible to completely wind the film in the cartridge without performing control by detecting the position of the film.
You can easily check the film patrone that has been taken.

(2) It is possible to divide the driving force from one motor into a driving force for driving the spool shaft for winding the film and a driving force for rotating the cartridge shaft of the loaded film cartridge. The dynamic transmission means, the planetary gear means for switching the driving force from the differential transmission means to the means for transmitting the driving force to the spool shaft, or the blocking means for blocking the transmission of the driving force, and the rotation of the spool shaft. Rotation preventing means for preventing the transmission of the driving force switched to the spool shaft by the planetary gear means during automatic loading so that the planetary gear means and the preventing means mesh with each other. And a camera having differential transmission means in which the driving force from the differential transmission means is only the driving force for rotating the cartridge shaft in a predetermined direction.

The camera having the above-mentioned differential transmission means is provided with rotation preventing means for preventing rotation of the spool shaft in addition to the camera described in Appendix 1, and is switched to the spool shaft by the planetary gear means. While the transmission of the driving force is blocked, the planetary gear means and the blocking means are engaged with each other so that the driving force is transmitted only to the shaft of the cartridge, and the automatic loading is performed by using the film cartridge of the feeding system.

With this arrangement, it is possible to easily carry out automatic loading by automatically feeding, winding and rewinding the film by using the feeding type film cartridge.

[0069]

As described above, according to the present invention, in the film feeding mechanism of the camera, when the film is wound, rewound, and automatically loaded by using the differential transmission means. It is possible to provide a camera having a differential transmission means capable of smoothly performing the above-mentioned operation and performing more efficient film feeding with stable operation.

[Brief description of drawings]

FIG. 1 is a side view of essential parts showing a film feeding mechanism of a camera having a differential transmission unit according to a first embodiment of the present invention.

2A and 2B are enlarged views of a main part of a ball differential, which is a differential transmission unit of the mechanism of FIG. 1, in which FIG. 2A is an enlarged vertical sectional view of the main part of the ball differential, and FIG. Detailed view of only the gear from the top.

FIG. 3 is a block diagram of the camera of FIG.

4 is a flowchart showing the operation of film winding in the camera of FIG.

5 is a flowchart showing the operation of rewinding the film in the camera of FIG.

FIG. 6 is a side view of essential parts showing a film feeding mechanism of a camera having a differential transmission unit according to a second embodiment of the present invention.

7 is a top view of the mechanism of the camera shown in FIG.

FIG. 8 is a side view of essential parts showing a film feeding mechanism of a camera having a differential transmission unit according to a third embodiment of the present invention.

9 is a top view of the mechanism of the camera shown in FIG.

10 is a block diagram of the camera of FIG.

11 is a flowchart showing a film feeding and winding operation when performing automatic loading in the camera shown in FIG.

FIG. 12 is an enlarged side view showing the basic structure of a conventional differential transmission mechanism.

[Explanation of symbols]

1 ………… Motor 3 ………… Ball differential (differential transmission means) 4 ………… Gear train (winding side) 5 ………… Spool (spool shaft drive means, driven means) 6 ………… Gear train (rewinding side) 7 ………… Fork part (Patrone shaft rotating means, driven means) 9 ………… Sun gear (switching means, planetary gear means) 10 ………… Carrier (switching means, planetary gears) Means) 11 ... Planetary gear (switching means, planetary gear means) 13 ... Fixed gear (stop member, blocking means) 14 ... Locking gear (rotation blocking means) 14a ... Locking claw (rotation blocking) Means) 15 ... Locking plate (rotation preventing means) 15a ... Claw (rotation preventing means) 16 ... Holding plunger (rotation preventing means)

Claims (3)

[Claims] 1. A camera having a differential transmission means capable of simultaneously distributing a driving force from one motor to two driven means, wherein one of the two driven means winds a film. A camera having a differential transmission means, which is transmitted to a spool shaft driving means for driving a take-up spool shaft, and the other driving force is transmitted to a patrone shaft rotating means for rotating a patrone shaft of a loaded film patrone. . 2. The spool shaft drive means has a switching means for switching one drive force from the differential transmission means to the spool shaft or a stop member for stopping transmission of the drive force. 2. The camera with differential transmission means according to claim 1, wherein the means is controlled so as to be switched to a stop member when the patrone shaft is driven in the rewinding direction. 3. A rotation blocking means for blocking the rotation of the spool shaft, wherein the rotation blocking means blocks the transmission of the driving force switched to the spool shaft by the switching means at the time of automatic loading. A camera having differential transmission means according to claim 2.