JPH09281574A - Film feeding device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately perform magnetic recording by restraining the fluctuation of load at the time of feeding film by a simple film feeding device in which one planet gear mechanism and one clutch are incorporated. SOLUTION: The clutch 21 for making a spool driving shaft 14 free after the photographic film 58 is taken up to a take-up shaft 15 is incorporated between the 1st and the 2nd gears 38 and 39 of a spool driving transmission system transmitting driving to the driving shaft 14 engaged with the spool 13 of a cartridge 12. The clutch 21 is constituted of an internal wheel member 63 rotating integrally with the gear 38 and an external pawl member 64 provided with an elastic external pawl integrally rotated with the gear 39. The impact caused in the case of outputting and releasing the coupling is absorbed by the elastic deformation of the external pawl to restrain the fluctuation of the load at the time of feeding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding device for a camera having a spool drive shaft for engaging a spool of a cartridge and a take-up shaft for winding a photographic film fed from the cartridge, and more particularly to a film feeding device for a camera. The present invention relates to a film feeding device that frees a spool drive shaft after a photographic film is wound on a winding shaft.

[0002]

2. Description of the Related Art A new photographic film cartridge standard [tentative model name: IX240 cartridge film] has been announced. In this cartridge, when not in use, the entire photographic film is stored in the cartridge, and when loaded in a camera or the like, the tip of the photographic film is sent out from the film inlet / outlet by the rotation of the spool. A transparent magnetic layer is applied to the back surface of the photographic film.

A camera using an IX240 cartridge is called an IX240 type camera, and corresponds to each frame on both sides in the width direction of the photographic film, such as photographic information and print information on each photographic frame on the magnetic layer of the photographic film. Recording is performed at the specified position with the magnetic head in the camera during film feeding. The film feeding is controlled such that the rotation angle of the motor is detected and the speed becomes constant so that the recording wavelength during magnetic recording becomes constant.

As a film feeding device for a general camera, a spool drive shaft for engaging a spool of a cartridge is provided in a cartridge loading chamber arranged on one side of an aperture, and a film winding device arranged on the other side. Each of the chambers is provided with a take-up shaft for taking up the photo film sent out from the cartridge, and the spool drive shaft and the take-up shaft are respectively rotated in the film winding direction or the film rewinding direction by the forward and reverse rotations of one motor. Rewind the film or rewind the film.

The peripheral speed of the winding shaft is set about 1.5 to 2 times faster than the film feeding speed in order to surely catch the leading end of the film. For this reason, after the photographic film is wound around the winding shaft, spool drive shaft disconnecting means is required to wind up the photographic film by rotating only the winding shaft and rotate the spool drive shaft following the transfer of the photographic film. Further, at the time of film rewinding, in order to rewind the photographic film only by rotation of the spool drive shaft, a take-up shaft separating means for disconnecting the drive of the motor to the take-up shaft is required.

Several film feeders are known for achieving the above function with a single motor for film feeding. In the device disclosed in Japanese Utility Model Laid-Open No. 3-54920, two planetary gear mechanisms are used, on the one hand, switching between main drive and driven of the spool drive shaft at the time of film winding, and on the other hand at film winding / rewinding. The shaft is connected / disconnected. Besides, for example, one planetary gear mechanism and two clutches are used, and the rotation direction of the spool drive shaft is switched at the time of winding / rewinding by the planetary gear mechanism, and one clutch is used to change the spool drive shaft at the time of film winding. There is a type in which main drive / driven drive is switched, and the other clutch is used to connect / disconnect the winding shaft at the time of film winding / rewinding.

[0007]

However, in the conventional film feeding apparatus as described above, the number of planetary gear mechanisms and clutches used is large and the structure is likely to be complicated. Especially, not only the cost will increase if the planetary gear mechanism is used often,
Since a space for retreating the planetary gears is required for switching between transmission and cancellation of drive, the assembling space tends to be large. In addition, if many clutches are used, the number of parts and the number of assembling steps increase, which also causes a cost increase.

Further, when recording on the magnetic layer on the photographic film described above, it is necessary to keep the feeding speed constant when the film is wound up. Therefore, for feeding the film while monitoring the feeding speed of the film. The rotation speed of the motor is controlled. Therefore, the rotation speed of the motor changes during film feeding, but in the case of switching the main drive / driven of the spool drive shaft, the load fluctuation at the time of switching is large and the film feeding speed is kept constant. It becomes difficult to keep.

The present invention has been made in order to solve the above problems, and has a simple structure, saves a space for assembling, and is a low-cost film feeding system capable of stably maintaining the feeding speed of the film. An object is to provide a feeding device.

[0010]

According to the present invention, basically, the above-mentioned film feeding function can be obtained only by incorporating one planetary gear mechanism and one clutch in the film feeding device. Therefore, in the present invention, the sun gear driven by the motor and the first and second planetary gears meshing with the sun gear are rotatably supported, and the hoisting position is obtained by the rotation of the sun gear during normal rotation of the motor. A switching member that moves to the unwinding position by the rotation of the sun gear when the motor reverses; and when the switching member moves to the winding position, meshes with the first planetary gear,
The rotation of the planetary gear drives the spool drive shaft in the film feeding direction via the spool drive transmission system, and when the switching member moves to the rewind position, the meshing with the first planetary gear is released and the second planetary gear is released. A first transmission gear that meshes with the gear and drives the spool drive shaft in the film rewinding direction via the spool drive transmission system by the rotation of the second planetary gear; and the first transmission gear when the switching member moves to the winding position. The second planetary gear meshes with the second planetary gear, and the rotation of the second planetary gear drives the winding drive shaft in the film winding direction via the winding shaft drive transmission system, and when the switching member moves to the rewinding position, the second planetary gear. A second transmission gear that is disengaged from the first transmission gear and is in a free state; In which consisted; the drive is transmitted to the spool drive shaft side of the clutch and to prohibit transmitting the driving force from the spool drive shaft side to the first planetary gear side.

According to a second aspect of the present invention, the first transmission gear is a two-stage gear that is coaxial and rotatable.
The first planetary gear is meshed with or disengaged from one of the gears, the second planetary gear is meshed with or disengaged from the other gear, and the spool drive transmission system is meshed with the clutch. Is provided between the gear and the other gear, and the drive in one rotation direction is transmitted from the one gear to the other gear.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 schematically shows a film feeding device of a camera. The cartridge loading chamber is
The film winding chamber is arranged on one side of the aperture 11 and on the other side. A spool drive shaft 14 that engages with the spool 13 of the cartridge 12 is arranged in the cartridge loading chamber, and a winding shaft 15 having a rubber roller wound around the outer periphery thereof is arranged in the film winding chamber.

The gear train between the spool drive shaft 14 and the take-up shaft 15 includes a motor drive transmission system 17 for transmitting the drive of the motor 16, a spool drive transmission system 18 for transmitting the drive to the spool drive shaft 14, and a take-up. It is composed of a take-up shaft drive transmission system 19 for transmitting drive to the shaft 15, a planetary gear mechanism 20 for switching between main drive and driven of the spool drive transmission system 18 and the take-up shaft drive transmission system 19, and a clutch 21. .

The motor 16 is housed inside the winding shaft 15. The motor drive transmission system 17 includes a drive gear 22,
D1 gear 23, D2 gear 24, D3 gear 25, D4 gear 26, D5 gear 27, and D6 gear 28,
The D1 gear 23 and the D2 gear 24, the D3 gear 25 and the D4 gear 26, and the D5 gear 27 and the D6 gear 28 are coaxially and integrally formed as a two-stage gear. The G6 gear 28, which is the output of the motor drive transmission system 17, meshes with the sun gear 29 of the planetary gear mechanism 20, and the normal rotation drive of the motor 16 is transmitted at the time of film winding to show the sun gear 29 in the same figure. Rotate counterclockwise.

A gear 31 integrally formed with the impeller 30 meshes with the D1 gear 23. A large number of slits are formed in the impeller 30 at predetermined angles, and a horseshoe-shaped photoelectric sensor 32 is arranged on the rotation locus of the slits. The photoelectric sensor 32 is connected to the control unit 33,
The control unit 33 outputs the output signal every time the passage of the slit is detected.
Send to The control unit 33 monitors the cycle of the pulse waveform obtained from the output signal, adjusts the timing of magnetic recording according to this cycle, and makes the recording pattern constant on the magnetic layer.

The planetary gear mechanism 20 includes a sun gear 29 and a first gear.
It is composed of a planetary gear 35, a second planetary gear 36, and a dogleg-shaped switching member 37. The switching member 37 is
A bearing portion that rotatably supports the shaft of the sun gear 29 is provided at the central bent portion, and first and second planetary gears 35 and 3 are provided at both ends.
Bearing units that rotatably support the shafts of 6 are provided. The first and second planetary gears 35 and 36 mesh with the sun gear 29 and revolve around the sun gear 29 about the axis of the sun gear 29. The sun gear 29 is formed such that the tooth width thereof is long in the axial direction, and the second planetary gear 36 meshes with the first planetary gear 35 at a position lower by one step.

The spool drive transmission system 18 includes the first gear 3
8, second gear 39, S1 gear 40, S2 gear 41, S3
Gear 42, S4 gear 43, S5 gear 44, S6 gear 4
5, S7 gear 46, S8 gear 47, S9 gear 48, S1
A reduction gear train composed of an O gear 49, an S11 gear 50, and an S12 gear 51, and includes an S3 gear 42 and an S4 gear 4
3, S6 gear 45 and S7 gear 46 are two-stage gears.
The first gear 38 and the second gear 39 constitute a first transmission gear, which is a two-stage gear that is coaxial and rotatable. The clutch 21 is incorporated between the first gear 38 and the second gear 39, and transmits the drive in one rotation direction from any one gear to the other gear.

The gear train from the first gear 38 to the S8 gear 47 is arranged on the bottom side of the camera body,
A gear train from the S9 gear 48 to the S12 gear 51 is arranged on the upper surface side of the camera body. S between these
The 8th gear 47 and the S9 gear 48 are connected via a connection shaft 53 arranged outside the cartridge loading chamber. The spool drive shaft 14 is integrally formed on the lower surface of the S12 gear 51, projects into the cartridge loading chamber, and is loaded with the carton 12 so that the spool 13
Smoothly engages.

The take-up shaft drive transmission system 19 is a reduction gear train composed of a second transmission gear 55, an M1 gear 56, and an M2 gear 57, and the second transmission gear 55 and the M1 gear 56.
And are two-stage gears. The M2 gear 57 is integrally formed on the lower outer circumference of the winding shaft 15.

When the film is wound, the normal rotation drive of the motor 16 is input to the sun gear 29, and the sun gear 29 rotates counterclockwise. When the sun gear 29 rotates counterclockwise, the switching member 37 is urged counterclockwise so that the first planetary gear 35 is the first gear 38 and the second planetary gear 36 is the second transmission gear. 55 to the winding position where they mesh with each other. As a result, the spool drive shaft 14 is driven in the film feeding direction, and the winding shaft 15 is driven in the film winding direction. When the film is rewound, the reverse rotation of the motor 16 is input to the sun gear 29, and the switching member 37 separates the first planetary gear 35 from the first gear 38 and the second planetary gear 36 from the second transmission gear 55. And moves to the rewinding position where it meshes with the second gear 39.
As a result, the take-up shaft 15 becomes free, and only the spool drive shaft 14 drives in the film rewinding direction.

On the photographic film 58, two perforations 59 adjacent to each other are formed at a constant pitch on one side within the effective exposure area located between the leader and the trailer in order to determine the position of the photographic frame. ing. A perforation sensor 60 is arranged on the side opposite to the aperture 11 across the film passage of the camera body. The perforation sensor 60 is connected to the control unit 33 and optically detects the passage of the perforation 59. Also, on the same side as the perforation sensor 60, the magnetic head 61
Is arranged. The magnetic head 61 is a driver 62
The photo film 5 is connected to the control unit 15 via
On a transparent magnetic layer coated on the side opposite to the emulsion surface, photographing information, print information, etc. regarding each photographed frame are recorded at a position corresponding to each frame during feeding of one film.

As shown in FIGS. 2 and 3, the clutch 21 has an inner ring member 63 integrally formed by recessing the lower surface of the first gear 38, and an outer ring rotatably supported inside the inner ring member 63. It is composed of a claw member 64. Inner ring member 63
Has a stepped portion at a sharp angle on a part of its inner surface, and this stepped portion serves as an inner claw 65.

The outer claw member 64 is provided with an arm portion 66 which is notched in a part of the outer circumference so as to be elastic.
A claw 67 that engages with the inner claw 65 is formed at the tip of the. The outer claw member 64 is provided with holes 69 that engage with three protrusions 68 formed integrally with the second gear 39, and the second gear 39 and the second gear 39 with the shaft 52 of the first gear 38 as the center. Rotate together. As the outer claw member 64, the claw 67 is used.
It is desirable to mold with an elastic material such as a plastic material in order to give the elastic force to. The number of inner claws 65 is 1
The number is not limited to one and may be plural. When there are a plurality of inner claws 65, it is desirable to also have a plurality of arm portions 66 having a claw 67 at the tip. Furthermore, the inner claw 65 and the claw 67 may have any shape as long as they can be engaged with each other and the drive can be transmitted.

The normal rotation drive of the motor 16 is transmitted to the first gear 38 to rotate the inner pawl 65 in the counterclockwise direction (arrow direction) shown in FIG. The outer claw member 64 is arranged so that the claw 67 engages with the inner claw 65 that rotates in the counterclockwise direction, and is on the drive side until the photographic film 58 is wound onto the winding shaft 15. When the photographic film 58 is wound around the take-up shaft 15, the photo film 58 is rotated faster than the inner pawl 65, so that the inner pawl 65 rotates.
Is disengaged from the claw 67.

The operation of the above configuration will be described. Control unit 33
After the cartridge 12 is loaded in the cartridge loading chamber, the motor 16 is normally rotated to perform the initial film winding. When the motor 16 rotates normally, the motor drive transmission system 1
The sun gear 29 rotates in the counterclockwise direction shown in FIG. As a result, the switching member 37 is biased counterclockwise, and the first planetary gear 35 meshes with the first gear 38. This causes the inner pawl 65 to rotate counterclockwise as shown in FIG.
It contacts the claw 67 of the outer claw member 64. At this time, the stationary inner pawl 67 is suddenly connected to the inner pawl 65 that rotates instantly, and a large impact is exerted on the pawl 67.
Elastically deforms and absorbs, so that they are connected smoothly.
Moreover, since the inner claw 65 engages with the claw 67 so as to widen the arm portion 66 toward the outer periphery, elastic deformation of the arm portion 67 is restricted by the inner surface of the inner ring member 63, and may be damaged such as bending. It can withstand long-term use.

When the inner pawl 65 and the pawl 67 are engaged, the drive of the motor 16 is transmitted from the first gear 38 to the second gear 39. As a result, the spool drive shaft 14 rotates in the film feeding direction (clockwise direction shown in FIG. 1). On the other hand, the second planetary gear 36 meshes with the second transmission gear 55 and transmits the drive of the motor 16 to the winding shaft drive transmission system 19.
As a result, the take-up shaft 15 moves in the film take-up direction (see FIG.
Rotate in the clockwise direction shown in.

When the spool 13 is driven by the spool drive shaft 14 in the film feeding direction, the photographic film 5
8 is started to be fed, and the leading end of the film is transferred toward the winding shaft 15 through the film passage in the camera.
When the tip of the film reaches the vicinity of the outer circumference of the winding shaft 15,
The film is guided along the outer circumference of the winding shaft 15 by the action of a film restraining roller or the like provided around the winding shaft 15. Since the winding shaft 15 has already rotated in the film winding direction, the leading end of the film fed as described above is immediately wound. And photo film 5
When 8 is wound around the winding shaft 15 for about one turn, the photographic film 58 is pulled by the driving of the winding shaft 15.

Thus, during the initial winding, 1
The perforation 59 of the frame is the perforation sensor 60
Then, the control unit 33 stops the normal rotation driving of the motor 16, and the first frame is set on the aperture 11. After that, the film is fed frame by frame in the same manner every time when photographing is performed.

The peripheral speed of the take-up shaft 15 is set to about 1.5 to 2 times faster than the film feeding speed in order to surely catch the leading end of the film. However, since the photo film 58 is loosely wound inside the cartridge 12, the second gear, which is the driven side of the first gear 38, which is the driving side, after the tightening is completed, that is, after photographing several frames. The rotation of 39 is faster, and the outer claw member 64
The claw 67 is separated from the inner claw 65, and the drive transmission between the motor drive transmission system 17 and the spool drive transmission system 18 is released. When the connection is released at this time, the arm 66 returns to the original state, and the connection is released smoothly without any impact. After the clutch 21 is disengaged, the spool 13 is replaced by the photo film 5.
It rotates following the transfer of 8.

During the feeding of one frame film, magnetic recording is performed by the magnetic head 61. During this time, the control unit 33
Monitors the cycle of the pulse signal obtained from the photoelectric sensor 32, and performs magnetic recording while adjusting the timing of magnetic recording according to this cycle. During this time, the inner claw 65 is replaced by the claw 67.
If the load fluctuates between the inner claw 65 and the claw 67 due to the contact between the inner claw 65 and the claw 67 being released, the film feeding speed may be kept constant. It gets harder. However, since this load variation is absorbed by the elastic deformation of the arm portion 66, this load variation is not transmitted to the feeding of the photographic film 15, and therefore the film feeding can be smoothly performed.

After the photographing of all the frames is completed, the normal rotation drive of the motor 16 is stopped, and then the reverse rotation drive of the motor 16 is started. As a result, the sun gear 29 rotates clockwise about the axis of the sun gear 29 as shown in FIG. 5, and the switching member 37 moves to the rewinding position. When the switching member 37 moves to the rewinding position, the second planetary gear 36
Separates from the M1 gear 55 and meshes with the second gear 39. At this time, the first planetary gear 35 is separated from the first gear 38. As a result, the winding shaft 15 becomes free. In addition, the second planetary gear 36 rotates the second gear 39 in the direction opposite to the direction when the film is wound, that is, in the clockwise direction.

When the second gear 39 rotates clockwise, the spool drive shaft 14 is driven in the film rewinding direction via the subsequent spool drive transmission system 18. This allows
The photographed film 58, which has been taken, is drawn into the cartridge 12 while being wound up by the spool 13. During this period, the winding shaft 15 rotates following the unwinding of the photographic film 58. As described above, the first transmission gear including the first gear 38 and the second gear 39 transmits the drive to the spool drive shaft 14 via the clutch 21 when the film is sent out, and does not pass through the clutch 21 when the film is rewound. , The reverse drive is transmitted to the spool drive shaft 14.

When the second gear 39 rotates clockwise, the claw 67 of the outer claw member 64 abuts the inner claw 65 to rotate the first gear 38 clockwise, but with the first planetary gear 35. Since the meshing is released, there is no problem even if the first gear 38 rotates.

When the rewinding is completed, the control unit 33 stops the driving of the motor 16 after a lapse of a fixed time after the perforation sensor 60 confirms that the leading end of the film has passed. After that, the cartridge 12 is taken out from the cartridge loading chamber.
Cartridge 1 containing the photographed film 58
2 is submitted to the laboratory. At the developing station, the photographic film 58 is pulled out from the cartridge 12 and developed by the developing machine. The developed photo film 58 is set in the photo printer, and each frame is printed. At this time,
Print information, photographing information, etc. magnetically recorded corresponding to each frame are read. Since the recording wavelength is constant at the time of reading, problems such as reading errors do not occur.

[0035]

As described above, in the film feeding device of the present invention, basically, only one planetary gear mechanism and one clutch are incorporated in the film feeding device, and therefore, the description will be given in the prior art. It has a simple structure and saves the installation space compared to the ones. Moreover, since the clutch is adopted as a mechanism for making the spool drive shaft free after the photo film is wound on the winding shaft,
The film feeding speed can also be stably maintained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a film feeding device of a camera.

FIG. 2 is a vertical sectional view of a clutch.

FIG. 3 is a cross-sectional view of the clutch.

FIG. 4 is an explanatory view showing a main part of a film feeding device when the film is wound up.

FIG. 5 is an explanatory diagram showing a main part of a film feeding device when the film is rewound.

[Explanation of symbols]

 11 Aperture 12 Cartridge 14 Spool Drive Shaft 15 Winding Shaft 16 Motor 20 Planetary Gear Mechanism 21 Clutch 58 Photo Film 61 Magnetic Head

Claims (2)

[Claims] 1. A spool driving shaft for driving a spool of a cartridge to feed a film from the cartridge, a winding driving shaft for driving a winding shaft for winding a film fed from the cartridge, and a motor for driving the spool. A film for a camera comprising a shaft and a take-up drive shaft, and a feed control mechanism for rotating the spool drive shaft when the film is fed by driving the take-up shaft. In the feeding device, the feeding control mechanism rotatably supports a sun gear driven by a motor and first and second planetary gears meshing with the sun gear, A switching member that moves to the winding position by rotation and moves to the unwinding position by rotation of the sun gear when the motor reverses, and this switching member. When the holding member moves to the winding position, the first
It meshes with a planetary gear, and the rotation of the first planetary gear drives the spool drive shaft in the film feeding direction via the spool drive transmission system, and when the switching member moves to the rewind position, the meshing with the first planetary gear is generated. A first transmission gear that is released and meshes with the second planetary gear, and drives the spool drive shaft in the film rewinding direction via the spool drive transmission system by the rotation of the second planetary gear; When moving to the second
When the switching member moves to the rewinding position by driving the winding drive shaft in the film winding direction via the winding shaft drive transmission system by meshing with the planet gear, the rotation of the second planet gear causes the second planet gear to move. The second state where the meshing of the
A transmission gear and a drive gear provided in the first transmission gear, which transmits drive from the first planetary gear side to the spool drive shaft side when the switching member is moving to the winding position, and drives from the spool drive shaft side. A film feeding device for a camera, comprising: a clutch for prohibiting transmission of the above to the first planetary gear side, and a clutch. 2. The first transmission gear is a coaxially rotatable two-stage gear, and one gear has a first planetary gear engaged or disengaged with the other gear having a second planetary gear. The spool drive transmission system is meshed with each other when meshed or disengaged, and the clutch is provided between the one gear and the other gear to drive the one gear from the one gear in the one rotation direction. The film feeding device for a camera according to claim 1, wherein the film feeding device transmits the film.