JPH10239743A - Motive power transmitting device for camera, and device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a motive power transmitting device small in size and inexpensive, by using a spool gear as an intermediate gear for transmitting driving force. SOLUTION: When a pinion gear 4 is rotated in a film winding driving direction by a motor, reduction gear trains 5 to 7 and the spool gear 3a are rotated and a winding spool 3 is also rotated. A thrust gear 11 is rotated by receiving the driving force of the motor through the spool gear 3a and a clutch part 12 gets in a coupled state. The rotation of a rewinding gear 13 is transmitted to a fork gear 16 through idler gears 14 and 15 and a cartridge spool engaged with a fork 16a is driven and rotated, so that the film 2 is fed out from a cartridge 1. The spool gear 3a is used as an idler gear for transmitting the driving force to the thrust gear 11 for inputting the driving force of the motor to a cartridge spool driving system leading to the fork gear 16 from the rewinding gear 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device such as a camera for winding and rewinding a film and a device using the same.

[0002]

2. Description of the Related Art Photographic film is disclosed in U.S. Pat.
As disclosed in U.S. Pat. Nos. 2,275 and 4,834,306, the leading end of the film is housed in a cartridge before use, and a film feeding mechanism inside the camera or the like after loading into the camera or the like. There is a type (hereinafter, referred to as a thrust type) in which a spool in a cartridge (hereinafter, referred to as a cartridge spool) is driven to feed out a film from inside the cartridge.

[0003] A method for winding a film sent from such a thrust type cartridge by a winding spool provided in a camera or the like, or by driving a cartridge spool to rewind the film into the cartridge is a special feature. JP-A-3-206435,
JP-A-3-287150 and JP-A-6-2
It has been proposed in, for example, US Pat.

[0004] For example, in the method proposed in Japanese Patent Laid-Open Publication No. H11-209, a one-way clutch is used to smoothly perform film winding by driving a take-up spool from driving of a film by driving a cartridge spool.

Further, in the method proposed in Japanese Patent Application Laid-Open Publication No. H11-157, two transmission paths are selectively used for driving the cartridge spool, so that the film can be transferred from the film feeding by the cartridge spool drive to the winding spool without using a one-way clutch. Switching to film winding by driving can be performed smoothly.

Further, in the publication proposed in Japanese Patent Application Laid-Open Publication No. H11-157, a sun gear is provided at the last stage of the reduction gear train, this sun gear has two planetary gears, and one planetary gear has a spool wound up. One of the methods is to feed the film, so that the switching from the film feeding to the film winding can be smoothly performed with a small feeding gear arrangement.

[0007]

However, these proposals require at least two driving force transmission systems for driving the cartridge spool and driving the take-up spool. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power transmission device such as a camera for reducing the size and cost and a device using the same.

[0009]

To achieve the above object, the present invention comprises a spool gear provided on a film take-up spool, and an output gear for outputting a driving force transmitted to the spool gear. A power transmission device such as a camera using the spool gear as an intermediate gear for transmitting a driving force, and a device using the same.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
FIG. 1 is a perspective view of a film feeder according to an embodiment.
This film feeding apparatus is used for various film using apparatuses such as a camera and a film observation apparatus (the same applies to other embodiments described later).

In FIG. 1, reference numeral 1 denotes a film cartridge, which is similar to those disclosed in US Pat. No. 4,832,275, US Pat. No. 4,834,306 and the like. That is, before use of the film, the leading end of the film 2 is housed in the cartridge,
After being loaded into the film feeding device, the cartridge spool is driven to rotate and the film 2 is fed out.

Reference numeral 3 denotes a take-up spool for winding up the film 2 sent from the cartridge 1. The spool 3 has its surface covered with rubber, which is an elastic member, in order to easily generate a frictional force with the film 2. Film winding section 3b
And a spool gear 3a for obtaining a rotational force. Reference numeral 4 denotes a pinion gear directly connected to a motor (not shown) housed in the take-up spool 3, reference numeral 5 denotes a first reduction gear in which a large gear portion 5a meshes with the pinion gear 4, and 6
Is an idler gear meshing with the small gear portion 5b of the first reduction gear 5, and 7 is a second reduction gear meshing with the idler gear 6. The second reduction gear 7 has a large gear portion 7a meshing with the idler gear 6, and a small gear portion 7b meshing with the spool gear 3a. As described above, the power transmission system from the pinion gear 4 directly connected to the motor to the spool gear 3a is always meshed as shown in the figure, and the drive switching member such as a planetary gear is not interposed. When such a motor is accommodated in the spool 3,
The reduction gear train can be arranged concentrated only on the upper part of the spool chamber accommodating the spool 3.

A planetary arm 9 is mounted on the rotating shaft of the second reduction gear 7, and a planetary gear 8 rotatably mounted on the planetary arm 9 meshes with the large gear portion 7a. In addition, between the second reduction gear 7 and the planetary arm 9,
A predetermined rotational friction is applied by a spring (not shown).

Reference numeral 11 denotes a thrust gear which is always meshed with the spool gear 3a. The thrust gear 11 is used as an input member of the clutch unit 12, and a rewind gear 13 is provided as an output member of the clutch unit 12.

FIG. 4 is an exploded perspective view of the clutch unit 12. As shown in FIG. In FIG. 4, 17 is the thrust gear 1
1 is a cam plate integrally provided with a convex portion 17a in three directions on the outer periphery. A bowl-shaped clutch cylinder 19 that rotatably houses the cam plate 17 is formed integrally with the rewind gear 13 (shown in a sectional view in FIG. 4). The rewind gear 13 and the shaft hole 13a of the clutch cylinder 19 are fitted to the rotary shaft 11a integrated with the thrust gear 11 and the cam plate 17. Reference numeral 18 denotes a steel ball disposed between the inner wall of the clutch cylinder 19 and the cam plate 17.

The clutch unit 12 configured as described above is
Due to the rotational speed relationship between the thrust gear 11 and the rewind gear 13, when the steel ball 18 is sandwiched between the inner wall of the clutch cylinder 19 and the convex portion 17 a of the cam plate 17, the steel ball 18 is in a connected state. Is dropped into the concave portion between the convex portions 17a, the connection is broken.

An idler gear 14 meshes with the rewind gear 13, a idler gear 15 meshes with the idler gear 14, and a fork 16a meshes with the idler gear 15 to engage with and drive the cartridge spool.
This is a fork gear integrally attached to the fork gear.

Next, the operation of the thus configured film feeding apparatus will be described. In FIG. 1, the solid arrow direction indicates the rotation direction of each member during the film rewind drive, and the dotted arrow direction indicates the rotation direction of each member during the film rewind drive.

First, when the pinion gear 4 is rotated by the motor in the film winding drive direction (the direction of the solid line arrow), the reduction gear train 5 meshing with the pinion gear 4
6, 7, and the spool gear 3a rotate in the direction of the solid arrow, respectively, and the winding spool 3 also rotates in the direction of the solid arrow. At this time, the rotation of the second reduction gear 7 causes the planetary arm 9 to rotate in the direction in which it comes into contact with the stopper 10, and the planetary gear 8 is retracted to a position where power is not transmitted to any gear.

Further, the thrust gear 11 meshing with the spool gear 3a receives a motor driving force via the spool gear 3a and rotates in the direction of the solid arrow. Thrust gear 1
When 1 rotates in the direction of the solid line arrow, the convex portion 17 of the cam plate 17
Since the steel ball 18 is pressed against the inner wall of the clutch cylinder 19 by a, the clutch portion 12 is brought into a connected state, and the thrust gear 11 and the rewind gear 13 rotate integrally. And
The rotation of the rewind gear 13 is transmitted to the fork gear 16 via the idler gears 14 and 15, and the cartridge spool engaged with the fork 16a is driven to rotate, and the film 2 is fed out of the cartridge 1.

When the film 2 sent out of the cartridge 1 reaches the film take-up part 3b of the spool 3, the film 2 is completely wound around the film take-up part 3b while being pressed against the film take-up part 3b by a pressing means (not shown). . The reduction ratio of each gear train of the apparatus is such that the peripheral speed of the film 2 on the surface of the take-up spool 3 is equal to that of the cartridge 1.
The film 2 wound around the take-up spool 3 drives the fork gear 16 faster in the direction of the solid line since the film 2 is always set to be faster than the speed at which the film 2 is sent out from the spool 2. Thereby, fork gear 1
6. The idler gears 15, 14 and the rewind gear 13 are rotated at a higher speed in the direction of the solid line arrow. Then, the rewind gear 13 moves in the direction of the solid line arrow in the direction of the thrust gear 1.
When the steel ball 18 rotates at a speed higher than 1, the steel ball 18 is driven into the concave portion of the cam plate 17 by friction with the inner wall of the clutch cylinder 19, so that the connection of the clutch portion 12 is released and the thrust gear 11 is released. Is not transmitted to the rewind gear 13. Therefore, thereafter, the film 2 is driven by the winding spool 3 alone.

The thrust gear 11 and the spool gear 3
“a” is the final reduction gear excluding the reduction gear between the idler gear 15 and the fork gear 16 during the winding drive (the gears 13, 14, and 15 are not reduced), so that the film 2 drives the fork gear 16. In this case, no large load is generated in the gears 13 to 15.
Therefore, the load for releasing the connection of the clutch unit 12, that is, the motor load can be reduced. Further, the switching from the film feeding drive to the film winding drive can be quickly performed.

On the other hand, when the pinion gear 4 is rotated by the motor in the film rewind driving direction (the direction of the dotted arrow), the reduction gear trains 5, 6, 7 and the spool gear 3a are rotated in the direction of the dotted arrow, respectively, and the winding spool 3 is rotated. Also rotate in the direction of the dotted arrow. At this time, the rotation of the second reduction gear 7 rotates the planetary arm 9 away from the stopper 10, and the planetary gear 8 meshes with the rewind gear 13. For this reason, the rotation of the second reduction gear 7 is transmitted to the rewind gear 13 to rotate it.

On the other hand, the thrust gear 11 meshing with the spool gear 3a also receives the motor driving force via the spool gear 3a and rotates in the direction of the dotted arrow. That is, the rewind gear 13 and the thrust gear 11 receive a driving force so as to rotate in the same direction with the clutch portion 12 therebetween. However,
Reduction ratio from the motor to the rewind gear 13 (gears 4, 5,
6, 7a, 8, 13) is the thrust gear 1
1 (the reduction ratio of the gears 4, 5, 6, 7, 3a, and 11), so that the rewind gear 13 always thrusts when the rewind drive is performed. It will rotate slower than the gear 11. For this reason, the cam plate 17 rotates in a direction to drive the steel ball 18 into the concave portion.
Is disconnected. Therefore, the driving force from the motor to the fork gear 16 is controlled by the second reduction gear 7, the planetary gear 8,
The power is transmitted through the rewind gear 13 and the idler gears 14 and 15.

At the time of rewinding, both the fork gear 16 and the spool 3 are driven in the rewinding direction.
Since the rewind speed of the film 2 on the surface of the spool 3 is always higher than the rewind speed of the film 2 on the surface of the cartridge spool rotated by the fork gear 16, the film 2 is kept in the spool chamber. As a result, the film 2 is prevented from being stretched.

As described above, in the film feeder of the first embodiment, the spool gear 3a is used as a gear to which the motor driving force for driving the spool 3 is input, and at the same time, the rewind gear 13 is used. It is also used as an idler gear that transmits a driving force to a thrust gear 11 that inputs a motor driving force to a cartridge spool driving system that reaches the fork gear 16. For this reason, the number of gears in the film feeder can be reduced, and the efficiency of driving force transmission to the cartridge spool drive system can be improved.

The spool gear 3a is arranged at the center of the spool chamber, and a relatively large gear is used, so that the output can be easily taken out from any direction on the plane of the spool gear. That is, the degree of freedom of arrangement of the thrust gear 11 is high.

The rewinding drive of the film feeder of the first embodiment is performed by meshing the planetary gear 8 with the rewinding gear 13 to transmit power, and the rewinding gear 13 (rewinding gear 13 Is determined by the arrangement of the thrust gear 11), even if it is arranged relatively far from the second reduction gear (the sun gear of the planetary gear 8) 7 by changing the size of the planetary gear 8 and the like. Easy to deal with.

From the above, the spool gear 3 is inevitably
The thicker clutch gear trains 11 and 13, planetary gear trains 8 and 9 and reduction gear trains 5, 6, 7 can be arranged in a concentrated manner on the upper part of the fork gear 16 after the clutch gear trains 12 and 13. Up to this point, the gears 14, 15, 16 can be arranged using a relatively thin space. That is, although the clutch is used, the film cartridge 1
There is no need to provide a bulky gear around the upper part of the cartridge chamber in which the cartridge 2 is loaded or in the space between the cartridge chamber and the spool chamber. Therefore, other members can be arranged in a wide space except for the thin space, and the space in the apparatus using the film feeding apparatus can be effectively used.

In addition, since the clutch gear trains 11, 13, the planetary gear trains 8, 9 and the reduction gear trains 5, 6, 7 can be arranged in a concentrated manner above the spool gear 3a, they can be integrated into one unit. This unit can also be used in various devices.

In the present embodiment, the movement range of the planetary gear 8 is limited to a position where the planetary gear 8 meshes with the rewind gear 13 and a position where the planetary gear 8 is disengaged. The range of movement of the planetary gear 8 can be made smaller than in the case of meshing, and in this regard, the film feeder can be made more compact.

In this embodiment, the planetary gear 8 does not mesh with the rewind gear 13 during the rewind drive.
For example, even if the idler gear 15 is engaged, there is no problem as long as the gear train has a configuration in which the connection of the clutch unit 12 is released.

(Second Embodiment) FIG. 2 is a perspective view of a film feeder according to a second embodiment of the present invention. Note that, in FIG. 2, the same reference numerals are given to the same components as those in the first and second embodiments, and description thereof will be partially omitted. In the present embodiment, the internal gear portion 3c is attached to the spool gear 3a.
And the small gear portion 7b of the second reduction gear 7 meshes with the internal gear portion 3c, and the spool gear (external gear portion) 3
The third embodiment differs from the first embodiment in that a thrust gear 11 is meshed with a through an idler gear 20.

Also in the film feeding apparatus of this embodiment, when the pinion gear 4 is rotated by the motor in the film winding driving direction (the direction of the solid arrow), the motor is transmitted to the spool gear 3a via the reduction gear trains 5, 6, and 7. The driving force is transmitted, and the spool 3 also rotates in the direction of the solid arrow. Here, the small gear portion 7b of the second reduction gear 7 and the internal gear portion 3c of the spool gear 3a are internally meshed with each other, so that the small gear portion 7b and the spool gear 3a are externally connected as in the first embodiment. As compared with the case of meshing, the larger the meshing range, the more stable driving of the spool 3 can be performed.

The spool gear 3a is an idler gear 2
0 to the thrust gear 11 to transmit the motor driving force,
This is rotated in the direction of the solid arrow. At this time, the rotation of the second reduction gear 7 causes the planetary arm 9 to rotate in the direction in which it comes into contact with the stopper 10, and the planetary gear 8 retracts to a position where it does not mesh with any gear.

As shown in FIG. 5, the clutch portion 12 'between the thrust gear 11 and the rewind gear 12 is different from the clutch portion (see FIG. 4) of the first embodiment (see FIG. 4). 17a '(the convex portion 17 of the steel ball 18)
a 'and the direction of engagement with the clutch cylinder 19 are different). That is, when the thrust gear 11 rotates in the direction indicated by the solid line arrow in FIG. 2 when the film is delivered, the cam plate 17 ′ integrated with the thrust gear 11 presses the steel ball 18 against the inner wall 12 of the clutch cylinder 19, so that the clutch portion 12 ′ It becomes connected state,
The rewind gear 13 rotates at the same speed as the thrust gear 11. Then, the film 2 is wound on the spool 3,
When the rewind gear 13 is rotated in the direction indicated by the solid line arrow at a speed higher than that of the thrust gear 11, the inner wall of the clutch cylinder 19 drives the steel ball 18 into the concave portion of the cam plate 17, so that the clutch portion 12 'is disconnected. Thereafter, the winding drive of the film 2 is performed only by the spool 3.

On the other hand, when the pinion gear 4 is rotated by the motor in the film rewind drive direction (the direction of the dotted arrow),
The motor driving force is transmitted to the spool gear 3a via the reduction gear trains 5, 6, and 7, and the spool 3 also rotates in the direction of the dotted arrow. Further, the spool gear 3a transmits a motor driving force to the thrust gear 11 via the idler gear 20, and rotates the same in the direction of the dotted arrow. At this time, the second reduction gear 7
The planetary gear 9 is turned in a direction away from the stopper 10 by the rotation of the planetary gear 8, and the planetary gear 8 meshes with the rewind gear 13 to rotate it in the direction of the dotted arrow.

Thus, the rewind gear 13 and the thrust gear 1
1 means that the clutch unit 12 rotates in the same direction, but the reduction ratio from the motor to the rewind gear 13 (gear 4,
The reduction ratios of the gears 5, 6, 7, 7a, 8, 13) are the same as the reduction ratios of the thrust gear 11 (gears 4, 5, 6, 7, 3a, 2).
(Reduction ratio of 0, 11), so that when the rewind drive is performed, the rewind gear 1
3 rotates slower than the thrust gear 11. Therefore, the cam plate 17 'rotates in a direction to drive the steel ball 18 into the concave portion, and the connection of the clutch portion 12' is always released during the rewinding drive. Therefore, the driving force from the motor to the fork gear 16 is controlled by the second reduction gear 7, the planetary gear 8, the rewind gear 13, and the idler gear 1
4.

The same effects as those of the film feeder of the first embodiment can be obtained in the film feeder of the second embodiment described above.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention.
1 shows a perspective view of a film feeding device according to an embodiment. Note that the same reference numerals are given to constituent elements common to the second embodiment, and description thereof will be partially omitted. This embodiment is different from the first embodiment in that the spool gear 3a and the thrust gear 11 are directly meshed with each other, and that the planetary gear 8 and the rewind gear 1 mesh with each other during the rewind drive.
The third embodiment differs from the second embodiment in that an idler gear 21 is interposed between the second embodiment and the third embodiment.

Also in the film feeder of this embodiment, when the pinion gear 4 is rotated by the motor in the film winding driving direction (the direction of the solid arrow), the motor is driven to the spool gear 3a via the reduction gear trains 5, 6, and 7. The force is transmitted, and the spool 3 also rotates in the solid arrow direction.

The spool gear 3a is connected to the thrust gear 1
1 is transmitted to the motor 1 and is rotated in the direction of the solid arrow. At this time, the rotation of the second reduction gear 7 causes the planetary arm 9 to rotate in the direction in which it comes into contact with the stopper 10, and the planetary gear 8 is retracted to a position where it does not mesh with any gear.

The clutch portion 12 between the thrust gear 11 and the rewind gear 12 is the clutch portion of the first embodiment (FIG. 4).
Reference). That is, when the thrust gear 11 rotates in the direction of the solid line arrow in FIG. 3 when the film is delivered, the cam plate 17 integral with the thrust gear 11 presses the steel ball 18 against the inner wall 12 of the clutch cylinder 19, so that the clutch 12
Is connected, and the rewind gear 13 is connected to the thrust gear 11
It rotates at the same speed as. Then, the film 2 is wound on the spool 3 and the rewind gear 13 is moved to the thrust gear 11.
When the clutch is rotated in the direction indicated by the solid line at a higher speed, the inner wall of the clutch cylinder 19 drives the steel ball 18 into the concave portion of the cam plate 17, so that the clutch portion 12 is in the disengaged state. The film 2 is wound up.

On the other hand, when the pinion gear 4 is rotated by the motor in the film rewind driving direction (the direction of the dotted arrow),
The motor driving force is transmitted to the spool gear 3a via the reduction gear trains 5, 6, and 7, and the spool 3 also rotates in the direction of the dotted arrow. Further, the spool gear 3a transmits a motor driving force to the thrust gear 11, and rotates the same in a direction indicated by a dotted arrow. At this time, the rotation of the second reduction gear 7 rotates the planetary arm 9 away from the stopper 10, and the planetary gear 8 meshes with the rewind gear 13 via the idler gear 21 and rotates this in the direction of the dotted arrow. .

Thus, the rewind gear 13 and the thrust gear 1
1, the clutch unit 12 rotates in the same direction, but the reduction ratio from the motor to the rewind gear 13 (gear 4,
5, 6, 7a, 8, 20, 13) are the reduction ratios up to the thrust gear 11 (gears 4, 5, 6, 7, 3).
a, 11), so that when the rewind drive is performed, the rewind gear 1
3 rotates slower than the thrust gear 11. Therefore, the cam plate 17 rotates in a direction to drive the steel ball 18 into the concave portion, and the connection of the clutch portion 12 is always released during the rewinding drive. Therefore, the driving force from the motor to the fork gear 16 is controlled by the second reduction gear 7, the planetary gear 8, the rewind gear 13, and the idler gears 14,1.
5 is transmitted.

In the film feeding apparatus of the third embodiment described above, the same effects as those of the film feeding apparatuses of the first and second embodiments can be obtained.

(Fourth Embodiment) FIG. 6 shows a fourth embodiment of the present invention.
1 shows a perspective view of a film feeding device according to an embodiment. FIG. 7 is an exploded perspective view of the gear head portion as viewed from the direction of FIG. 6A. Note that, in these drawings, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be partially omitted. 6 and 7, reference numeral 4 denotes
A pinion gear 5 directly connected to a film feed motor (not shown) is a reduction gear having a large gear portion 5a meshed with the pinion gear 4, and 22 is a planetary gear that rotates with the reduction gear 5 as a sun gear. The large gear portion 22 a of 22 is engaged with the small gear portion 5 b of the reduction gear 5. Reference numeral 23 denotes a planetary plate for selectively meshing the small gear portion 22b of the planetary gear 22 with the internal gear portion 3c of the spool 3 and the sun gear 25.
Reference numeral 4 denotes a planetary shaft which rotatably holds a planetary gear 22 with a spring (not shown) interposed therebetween. Reference numeral 25 denotes a sun gear which rotates at a fixed position which does not mesh with the internal gear portion 3c of the spool 3.
6 is always a large gear portion 29 of the sun gear 25 and the transmission gear 29.
The planetary clutch gear 27 that meshes with the sun gear 25 and rotates about the sun gear 25, and performs a clutch function between the planetary clutch gear 26 and the planetary clutch gear 26.
The planetary thrust gear 28 that rotates between a position where it meshes with the internal gear portion 3c and a position that does not mesh with the internal gear portion 3c is a clutch shaft that constitutes the rotation shaft of the planetary clutch gear and the planetary thrust gear, and is a planetary gear provided on the planetary plate 23. The clutch shaft 2 is attached to the plate cam portion 23a.
The end projection 28a of the clutch 8 engages, and the revolving position of the clutch shaft 28, that is, the planetary thrust gear 27 is controlled.

FIGS. 8 and 9 show the planetary clutch gear 2 of FIG.
FIG. 6 is an exploded perspective view of a clutch unit including a clutch 6 and a planetary thrust gear 27. 8 and 9, reference numeral 31 denotes a sun gear rotating sleeve integrally crimped to the planetary plate 30, which is fitted with the sun gear 25. The planetary clutch gear 26 is
As shown in FIG. 9, the lower surface is provided with an inclined claw surface 26a. Similarly, the planetary thrust gear 27 is also provided with an inclined claw surface 27a as shown in FIG. The clutch shaft 28 is held by the planetary plate 30 while pressing the planetary clutch gear 26 against the planetary thrust gear 27 while compressing the coil spring 32.

Next, the operation of the thus configured film feeding apparatus will be described. FIG. 10 is a plan view showing the state of the film feeding device when the feeding of the film from the cartridge is started. In FIG. 10, a reduction gear 5 driven by a pinion gear 4 (not shown) rotates in the direction of the arrow. The planetary gear 22 meshing with the reduction gear 5 exerts a force in the direction of the arrow on the planetary shaft 24 due to the revolving force, and the planetary gear 22 is held at a position meshing with the internal gear portion 3c of the spool 3. . At this time, the planetary gear 22
Is a position that does not mesh with the sun gear 25. Then, the spool 3 is rotated by the planetary gear 22 in the direction of the arrow (the film winding direction). In this case, since the internal gear portion 3c of the spool 3 is a large-diameter internal gear, the internal gear portion 3c of the spool 3 is moved from the pinion gear 4 to the internal gear portion 3c.
Sufficient deceleration is possible despite the small number of gear steps.

Further, the end projection 28a of the clutch shaft 28 is restricted by the movement of the planetary plate cam portion 23a of the planetary plate 23 toward the inscribed gear portion 3c of the spool 3, whereby the planetary thrust gear 27 is The meshing is held by the internal gear portion 3c. Then, since the inclined claw groove 27a of the planetary thrust gear 27 shown in FIG. 8 rotates in a direction in which the inclined claw groove 26 of the planetary clutch gear 26 engages, the planetary clutch gear 26 rotates integrally with the planetary thrust gear 27. Then, the power of the planetary clutch gear 26 is transmitted to the large gear portion 29a of the transmission gear 29. That is, the planetary thrust gear 27 draws the power of the internal gear 3c of the spool 3 driven by the rotational force of the planetary gear 22 from a different location of the internal gear 3c and transmits it to the fork gear 16. I have.

In this state, the gear rotates in the direction indicated by the solid line in FIG. When the fed film 2 is wound while being pressed against the spool 3b by the elastic member 33, the winding speed of the spool 3 is set to be higher than the film feeding speed of the thrust feeding by the fork gear 16. The film 2 is drawn out by the spool 3 at a higher speed than the thrust feed by the fork gear 16. For this reason, the tensile force of the film 2 due to the rotation of the spool 3 is transmitted to the fork gear 16, and the planetary clutch gear 26 is rotated in the direction indicated by the arrow at a higher speed than the planetary thrust gear 27, so that the planetary clutch gear 26 and the planetary thrust The connection with the gear 27 is released, and the film 2 is driven by the winding spool 3 alone. At this time, since the sun gear 25 is always meshed with the planetary clutch gear 26, the planetary clutch gear 2
6, the film is rotated only by idling, so that the above-mentioned film feeding and winding operations are not hindered.

FIG. 11 is a plan view showing the state of the film feeding apparatus immediately after the film is fed out and switched from the winding operation to the rewinding operation. In FIG. 11, a reduction gear 5 receiving power from a pinion gear 4 (not shown) is driven in a direction indicated by a dotted arrow. Small gear part 2 of planet gear 22
2b is disengaged from the internal gear 3c of the spool 3 by the rotation of the planetary plate 23 in the direction of the dotted arrow, and the sun gear 25
It moves in the direction to mesh with. At the same time, the end projection 28a of the clutch shaft 28 is displaced in the direction of the dotted arrow where the planetary thrust gear 27 does not mesh with the internal gear 3c of the spool 3 due to the movement of the planetary plate cam portion 23a of the planetary plate 23.

FIG. 12 is a plan view showing the state of the film feeding device during the film rewinding operation. The small gear portion 22b of the planetary gear 22 meshes with the sun gear 25 and applies a rotational force in the direction of the dotted arrow. While the planetary clutch gear 26 obtains the revolving force centered on the sun gear 25, the planetary plate cam portion 2
3a, the planetary thrust gear 27 is held at a position where it does not mesh with the internal gear 3c of the spool 3, and the sun gear 25, the planetary clutch gear 26, the transmission gear 2
9, fork gear 1 through idler gears 14 and 15
The film rewind driving force in the direction of the dotted arrow is transmitted to 6. Accordingly, the take-up spool 3 rotates following the rewinding force of the film wound around the film winding section 3b without receiving any power from the motor. Then, as shown in FIG. 6, even if film rewinding and rewinding are repeatedly performed due to the presence of the elastic member 33 (a leaf spring or the like) that presses the film on the film winding portion 3 b,
The film can be fed without being loosened from the film winding section 3b of the spool 3.

In the film feeding apparatus of the fourth embodiment described above, the same effects as those of the film feeding apparatus of the above embodiment can be obtained.

(Correspondence between the Invention and the Embodiment) In the above embodiment, the take-up spool 3 is the film take-up spool of the present invention, the spool gear 3a is the spool gear of the present invention, the thrust gear 11, the idler gear 20 and the like. Alternatively, the planetary thrust gear 27 is the output gear of the present invention, and the idler gear 14, the idler gear 15, and the fork gear 16 are the cartridge drive system of the present invention.
2, the clutch unit 12 'or the planetary clutch gear 26,
And the planetary thrust gear 27 is a clutch part of the present invention, and the planetary gear 8 or the sun gear 25, the planetary clutch gear 2
6 and the transmission gear 29 are the pinion gear 4, the first reduction gear 5, the idler 6, and the second reduction gear 7, or the pinion gear 4, the first reduction gear 5, , And the planetary gear 22 are connected to the driving force input system of the present invention by the pinion gear 4, the first reduction gear 5, and the idler 6, or the pinion gear 4, the first reduction gear 5, and the planetary gear 2.
The two large gear portions 22a correspond to the driving force reduction system of the present invention, respectively.

The correspondence between the components of the embodiment and the components of the present invention has been described above. However, the present invention is not limited to the configuration of the embodiment, and the functions described in the claims or Any configuration that can achieve the functions of the configuration of the embodiment can be applied.

For example, in the above embodiment, the spool gear provided on the film take-up spool is used as an intermediate gear for transmitting the driving force for feeding the film. The spool gear is not limited to the force transmission, and a spool gear may be used as an intermediate gear for transmitting another driving force such as driving of an optical system.

The present invention also relates to each of the above embodiments or
You may combine these technical elements as needed.

Further, the present invention is applicable to a case where the whole or a part of the configuration of the claim or the embodiment forms one device or is combined with another device. It may be an element constituting the device.

Further, the present invention can be applied to various types of cameras such as a single-lens reflex camera and a lens shutter camera, and also to other devices such as a film viewing device, a film using device, and a power transmission device other than the camera. Things.

[0062]

As described above, according to the present invention,
It is possible to provide a power transmission device such as a camera and a device using the same that can use a spool gear provided on a film take-up spool as an intermediate gear for transmitting a driving force and that can be reduced in size and cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a film feeding device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a film feeding device according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a film feeding device according to a third embodiment of the present invention.

FIG. 4 is an exploded perspective view of a clutch unit used in the film feeding devices of the first and third embodiments.

FIG. 5 is an exploded perspective view of a clutch unit used in the film feeding device according to the second embodiment.

FIG. 6 is a perspective view of a film feeding device according to a fourth embodiment of the present invention.

FIG. 7 is an exploded perspective view of the gear head portion as viewed from the direction of FIG. 6A.

FIG. 8 is an exploded perspective view of the clutch unit shown in FIG. 6;

FIG. 9 is an exploded perspective view of the clutch unit of FIG. 6;

FIG. 10 is a plan view of the film feeding device of FIG. 6 at the start of film thrust feeding.

FIG. 11 is a plan view when the film rewinding operation of the film feeding device in FIG. 6 is switched.

FIG. 12 is a plan view of the film feeding device of FIG. 6 during a film rewinding operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film cartridge 2 Film 3 Hoisting spool 4 Pinion gear 5, 7 Reduction gear 6 Idler gear 8 Planetary gear 9 Planetary arm 10 Stopper 11 Thrust gear 12, 12 'Clutch part 13 Rewind gear 16 Fork gear 17, 17' Cam plate 18 Steel Sphere 20,21 idler gear 22 planetary gear 23 planetary plate 25 sun gear 26 planetary clutch gear 27 planetary thrust gear 28 clutch shaft 29 transmission gear 30 planetary plate 31 sun gear sleeve 32 coil spring 33 elastic member

Claims (20)

[Claims] 1. A power transmission device comprising: a spool gear provided on a film take-up spool; and an output gear for outputting a driving force transmitted to the spool gear. 2. The power transmission device according to claim 1, wherein the spool gear is provided on an outer periphery of the film take-up spool. 3. The power transmission device according to claim 1, wherein the spool gear is provided on an inner periphery of the film take-up spool. 4. The power transmission device according to claim 1, further comprising a cartridge driving system that drives a film supply unit of the film cartridge by the driving force from the output gear. 5. The power transmission device according to claim 4, wherein the cartridge driving system drives the film to be fed from the cartridge by the driving force from the output gear. 6. The apparatus according to claim 1, further comprising a clutch portion for cutting off a driving force from said output gear to said cartridge driving system when said film is wound by said film take-up spool. 6. The power transmission device according to 5. 7. A cartridge drive system for transmitting a drive force for performing film rewind drive to the cartridge to the cartridge drive system without passing through the output gear, wherein the clutch unit includes: When the second driving force transmission system transmits a driving force for performing film rewind driving to the cartridge to the cartridge driving system, the driving force is transmitted from the output gear to the cartridge driving system. The power transmission device according to claim 6, wherein the power transmission device is disconnected. 8. The power transmission device according to claim 4, further comprising a second driving force transmission system that transmits a driving force to the cartridge driving system without passing through the output gear. 9. The power transmission device according to claim 8, wherein the second driving force transmission system is selectively switched between a state in which the driving force is transmitted to the cartridge driving system and a state in which the driving force is not transmitted. . 10. The cartridge driving system according to claim 2, wherein:
10. The power transmission device according to claim 8, wherein the film rewinding drive to the cartridge is performed by the driving force from the driving force transmission system. 11. When the film rewind drive to the cartridge is not performed, the second drive force transmission system
The power transmission device according to claim 8, wherein the power transmission device is switched to a state in which the driving force is not transmitted to a cartridge driving system. 12. The cartridge driving system according to claim 2, wherein:
When the film rewinding drive to the cartridge is performed by the driving force from the driving force transmission system, a clutch unit that interrupts the transmission of the driving force from the output gear to the cartridge driving system is provided. Claims 8 to 1
2. The power transmission device according to claim 1. 13. A power transmission device comprising a driving force input system for transmitting the driving force to the spool gear. 14. The power transmission device according to claim 13, wherein the driving force input system has a driving force reduction system. 15. The driving force input system is connected to the spool gear at all times.
5. The power transmission device according to 4. 16. The power transmission device according to claim 13, wherein the driving force input system disconnects the connection with the spool gear when rewinding the film to the cartridge. 17. The power transmission device according to claim 13, wherein the driving force input system supplies a driving force from a motor. 18. The power transmission device according to claim 1, wherein the spool gear rotates the spool by the transmitted driving force. 19. A camera, comprising: a film take-up spool; a spool gear provided on the film take-up spool; and an output gear for outputting a driving force transmitted to the spool gear. 20. An apparatus using a film, comprising: a film take-up spool; a spool gear provided on the film take-up spool; and an output gear for outputting a driving force transmitted to the spool gear.