JP2766188B2 - Film winding and rewinding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film winding and rewinding apparatus, and more particularly, to positioning a hole opened on both sides of a film at a center line of a gap between photographing screen sections. And a film winding and rewinding device.

[0002]

2. Description of the Related Art In a conventional film rewinding and rewinding apparatus of this type, a film is mounted on a rewinding shaft of a camera, the film is passed through a photographing unit while gripping an end of the film, and then the film is rewinded on a rewinding shaft. The film is loaded into the camera by locking and closing the back cover. At this time, the film is wound using a rotating force of the winding shaft and a gear such as a sprocket, and the gear is engaged with holes formed in both sides of the film at regular intervals to wind the film. Can be In recent years, there has been known an apparatus using a roller made of rubber or the like without using the gear.

[0003]

In the conventional film winding and rewinding apparatus, when loading a film, it is not possible to adjust the positions of the photographing screen portion and the holes of the film. At that time, when shooting using a plurality of films, the positional relationship between the shooting screen portion and the holes may differ for each film. For this reason, when the film is taken using a positive film and a phenomenon occurs, when the image is separated for each screen, a gap occurs between the position of the gap and the hole between the photographed screen parts to be cut, and Because the size of the deviation is not constant,
There is a possibility that the film may be erroneously cut. Further, when the film separated into one screen is mounted on the slide mount, the position of the hole is not constant, so that there is a possibility that the film may be displaced in the feeding direction.

Therefore, a technique to be solved for loading and winding the film so that the holes opened opposite to both sides of the film are positioned on the center line of the gap between the photographing screen parts. Therefore, an object of the present invention is to solve the problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and has a rewind shaft and a take-up shaft provided on the left and right sides of a photographing unit. ,
In a film winding and rewinding device for loading a film punched and opened with holes respectively facing gap portions between photographing screen portions on the rewind shaft and transferring the film to the rewind shaft,
A friction clutch is provided on the rewind shaft with a torsion spring interposed, and the rewind shaft is urged in the rewind direction, while a motor is rotatably engaged with the rewind shaft in the forward and reverse directions. At the same time, when the film is loaded, the electric contact is fixed to one surface of the film at a position where the opposed holes are respectively passed and attached to the electric contact on the other surface. A film winding and rewinding device provided with a stopper so as to urge it, and a pawl wheel mounted on the winding shaft, and a pawl protruding inside a pulley externally fitted to the winding shaft. A ratchet mechanism is formed by meshing a car and a pawl, and the pulley and the pulley provided on the rewinding shaft are wound around a toothed belt, and the toothed belt rotates forward and reverse by motor driving. And the rewinding shaft and the rewinding shaft are wound in a winding direction or a rewinding direction. To is to provide the rotatable and the film winding unwinding device.

[0006]

According to the first aspect of the present invention, a film is loaded on a rewinding shaft of a film winding and rewinding device, the end of the film is gripped and pulled out, mounted on a winding shaft, and the camera back cover is closed. For example, since the motor of the winding shaft is driven to rotate the winding shaft in the winding direction, the film passes from the end of the stopper to the winding shaft while passing between the leading end of the stopper and the electrical contact. It is wound up. Then, as the film is wound, a rotational force in the rewind direction is applied to the rewind shaft by the elastic restoring force of a torsion spring interposed between the rewind shaft and the friction clutch.

Further, when the film is wound, a pair of holes formed in the film pass through the respective tips of the stoppers, so that the tips of the stoppers come into contact with the electrical contacts. In that case, the drive of the motor is stopped, the hole of the film is fixed by the stopper, and the film is pulled in the direction of the rewind shaft by the rotational force applied to the rewind shaft. Thus, the film thus stretches the photographic surface in a plane, so that the holes in the film are accurately positioned at the center line of the gap between the photographic screen portions.

Next, the invention according to claim 2 is configured such that the toothed belt interposed between the winding shaft and the rewinding shaft can be rotated in forward and reverse directions by driving a motor. ,
When the motor is driven to rotate in the film winding direction, the pawl provided inside the pulley externally fitted to the winding shaft engages with the ratchet wheel to rotate the winding shaft. Thus, the film is wound up in the direction of the winding shaft. Thus,
After the photographing, the stopper engaged with the hole of the film is released from the hole. Therefore, if the motor is driven to rotate in the rewind direction, the toothed belt rotates the rewind shaft via the pulley of the rewind shaft. The rewind shaft rotates the take-up shaft while pulling the film, and the motor rotates the pulley of the take-up shaft via a toothed belt. The film is rewound to the rewind shaft without engaging the film.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. 1 and 2 show a film winding / rewinding device 41. The film winding / rewinding device 41 is a device for loading a film 52 into a camera 40. Oval holes 53 are formed in the film 52 so as to face both sides in the feeding direction.
a, 53b, 53a, 53b ... are perforated. Reference numeral 42 denotes a back cover of the camera 40. When the back cover 42 is opened, a rewind shaft 43 is provided at the left end. A friction clutch 45 is disposed below the rewinding shaft 43. The friction clutch 45 includes a lower friction plate 45a and an upper friction plate 45b. (Not shown). Further, the upper friction plate 45b of the friction clutch 45 and the rewind shaft 43
A torsion spring 46 is interposed between the torsion spring 46 and the one side 43a.

On the other hand, a take-up shaft 47 is provided at the right end when the back cover 42 is opened, and a motor 48 for film winding is provided below the take-up shaft 47. 47 is rotatably engaged. A photographing unit 49 is provided between the rewinding shaft 43 and the winding shaft 47, and an electric contact 50 is disposed on the right side of the photographing unit 49. Further, the inner part of the back cover 42, and
Holes 53a, 53 formed on both sides of the film 52
Stoppers 51, 51 are fixedly provided at positions where b passes. The stoppers 51, 51 are formed of a conductive leaf spring or the like, and the lower end 51a is fixed to the back cover 42. Further, the stoppers 51, 51 are extended forward, and the distal ends thereof are protruded upward to bend further, so that the distal ends 51b, 5
1b, and the front end portions 51b, 51b are in contact with the electric contact 50 while being urged against the electric contact 50.

When loading the film 52 into the film winding / rewinding device 41, first, the back cover 42 is opened and the film 52 is pressed against the one side 43a of the rewinding shaft 43 while rewinding. The shaft 43 is loaded. Then, the end of the film 52 is gripped and pulled out while being rotated by the rewind shaft 43, and the end of the film 52 is
Attach to Thereafter, when the back cover 42 is closed, a switch (not shown) of the film winding motor 48 is turned on, the motor 48 is driven to rotate, and the winding shaft 47 is rotated.
Is rotated in the winding direction.

The film 52 having an end mounted on the winding shaft 47 is wound on the winding shaft 47 from the end. As a result, the film 52 is
9 is moved in the direction of the winding shaft 47, and the stoppers 51, 51 urge the film 52 from the opposite surface to the electrical contacts.

Further, the film 52 is connected to the rewind shaft 43.
And the rewind shaft 4 is rotated with the rotation of the rewind shaft 43.
3 and the torsion spring 4 interposed between the friction clutch 45
The rotational force is urged to the rewind shaft by the restoring force of 6. Since the lower end of the torsion spring 46 is locked to the upper friction plate 45b of the friction clutch 45, the torsion spring 46 has the rewinding shaft 43 that maximizes the frictional force of the friction clutch 45. The rotation force (torque) in the direction opposite to the rotation of the rotation is stored. At that time, a tensile force is applied to the film 52 by the winding shaft 47 and the rewinding shaft 43.

Further, when the film 52 is wound up, holes 53a, 53b opened through the front ends 51b, 51b of the stoppers 51, 51 facing the film 52 pass. At this time, the tip 51b of the stopper 51 comes into contact with the electric contact 50. In that case, since the electrical contact 50 and the stopper 51 are electrically connected, the driving of the motor 48 is temporarily stopped by a program stored in advance in a control unit (not shown), and The motor 48 is rotated at a low speed by a small amount in the reverse direction.

Further, since torque is accumulated in the torsion spring 46 interposed on the rewind shaft 43, the film 52 is urged toward the rewind shaft 43. The holes 53a, 53b of the film 52 are locked to the tips 51b, 51b of the stoppers 51, 51. Thus, the film 52 always exerts a tensile force on the film between the stoppers 51, 51 and the rewinding shaft 43 by the torsion spring 46,
Since the film 52 is flattened by the photographing section 49 and the holes 53a and 53b are fixed by the stoppers 51 and 51, the holes 53a and 53b are positioned on the center line of the gap between the photographing screen sections. Is done.

The stopper 51 shown in FIG. 3 can be used. In the figure, holes 53a and 53b are formed in the film 52. Reference numeral 50 denotes an electric contact, and a claw 5 is provided below the electric contact 50.
6 and 56 are brought into contact with each other, and pins 57 and 57 are pivotally connected to the other ends of the claws 56 and 56, respectively. Further, compression coil springs 58, 58 are provided at the lower center of the claws 56, 56, and the compression coil springs 58, 58 urge the claws 56, 56 upward to form stoppers 59, 59. When the film 52 passes between the electrical contact 50 and the stopper 59, the leading ends of the stoppers 59 and 59 pass through holes 53a and 53b formed on both sides of the film 52. Then, the stopper 59 comes into contact with the electric contact 50.

FIG. 4 shows a film 52 used in the winding and rewinding device of the present invention. A leader 54 is connected to the leading end of the film 52. The reader 54 has a light shielding effect of the film 52 and is formed to have the same width as the film 52. A detachable adhesive or the like is applied to the distal end portion of the leader 54, and the leader 5
4 is wound around the outer periphery of the film 52 to prevent the film 52 from being exposed to light.
When the film 52 is loaded into the above-described winding / unwinding device 41, the length of the
2 is formed so as to be longer than the length capable of preventing exposure to light. The film 52 has, for example, oblong holes 53a, 53b, 5
3a, 53b,...

Although not shown, a trailer is connected to the end of the film 52, and the trailer has the same light-shielding effect as the reader 54. The trailer is formed to have a length that can be wound around the outer peripheral portion of the film 52. At that time, when the film 52 is loaded into the above-described winding and rewinding device 41 and the back cover is closed,
Since the winding and rewinding device 41 turns on the switch of the film winding motor, the film 52 is wound in the winding axis direction, and the leading holes 53a and 53b are formed with the stoppers 51 and 53b as described above. It is positioned at 51. In this way, it is not necessary to feed an extra film for safety as in the conventional winding mechanism of a camera, so that the film can be effectively used.

As shown in FIGS. 1 and 2, when taking a picture with a camera provided with the winding / rewinding device 41, the shutter button is depressed and the shutter is released, thereby completing the photographing of one screen. Is done. At this time,
A signal to start winding the film is output from the winding / unwinding device 41, and the film 52 is inserted into the next hole 53a,
Winded up to 53b. Further, if the photographing operation described above is continued, the film 52 is photographed up to the last screen. At this time, the trailer (not shown) is connected to the end of the film 52, and the trailer is formed of paper or the like having the same light-shielding effect as the reader 54. When the film 52 is photographed to the last screen, the trailer is rewinded to the winding shaft
3. The film 5 taken up from the winding shaft 3
2 to prevent exposure of the photographed film 52.

Next, an embodiment of the present invention will be described with reference to FIG. For convenience of explanation, the same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted. A pulley 68 is axially mounted on the rewind shaft 43, and a torsion spring 46 is interposed between the pulley 68 and the friction clutch 45. On the other hand, the ratchet 69 is connected to the winding shaft 47.
And pulley 70 is pivotally connected to pulley 70
The claw 71 protrudes inward to constitute a ratchet mechanism. Then, the pulley 70 on the take-up shaft 47 side and the pulley 68 on the rewind shaft 43 side are wound around the toothed belt 72. Furthermore, a drive motor 73 is provided on the toothed belt 72, and the film winding / rewinding device 74 is configured so that the toothed belt 72 is rotatable in the winding or rewinding direction by the driving motor 73. You.

When the film winding / unwinding device 74 is used, the above-described film 52 is loaded on the rewinding shaft 43, and the leading end of the film 52 is mounted on the winding shaft 47. When the driving motor 73 is driven to rotate in the winding direction (the direction of arrow A), as described above, the film 52 is moved to a position where the holes 53a and 53b of the film 52 and the stopper (not shown) are engaged. 52 is wound up.

At that time, since the film 52 loaded on the rewind shaft 43 has the largest winding diameter when the film is loaded, the number of revolutions of the rewind shaft 43 associated with the winding of the film 52 is minimized. Since the winding diameter of the film 52 is reduced by winding the film 52, the number of rotations of the rewind shaft 43 increases. Therefore, the ratio of the diameter of the rewind shaft to the diameter of the take-up shaft is defined as a relation of inequality represented by (Equation 1).

[0023]

(Equation 1)

At this time, the pulley 68 of the rewind shaft 43
The number of rotations caused by winding the film 52 from the pulley 70 of the winding shaft 47 is always small. For this reason, when the driving motor 73 is rotated in the winding direction, an excessive rotational force is not applied to the film 52, and
The torsion spring 46 can store a reversing force.

Further, after photographing, the film 5
If the trailer at the end of No. 2 is fixed to the reel, the film 5
When all the rolls 2 are wound, an excessive load is applied to the drive motor 73, so that the end of the film 52 can be detected. Also, when the film 52 is rewound before the end of the film 52, when the specified number of the films 52 is detected by a counter or the like, or when the film 52 is wound up to the end of the film 52 described above. And
By releasing the engagement between the stopper and the holes 53a and 53b and interlocking a reverse rotation switch (not shown), the driving motor 73 is driven to rotate in the rewinding direction (arrow B direction).

At that time, the pulley 68 of the rewind shaft 43
Is rotated in the rewinding direction, so that the film 52 moves in the rewinding direction. Then, since the film 52 rotates the winding shaft 47, the ratchet 69 is rotated in the rewinding direction. However, the pulley 70 of the winding shaft 47
Since the drive motor 73 is also rotated in the rewind direction, the rotation of the ratchet 69 is slower than the rotation of the pulley 70, so that the ratchet 69 and the pawl 71 of the pulley 70 are engaged. There is no.

When the film 52 is rewound and the stopper is engaged with the holes 53a and 53b of the film 52, the driving motor 73 is once rotated slightly in the winding direction. Let it. Since the stopper is in contact with the electric contact as described above, the drive motor 73 can be controlled, and the stopper is separated from the holes 53a and 53b of the film 52, and The possibility that the holes 53a and 53b are enlarged or damaged can be eliminated.

Further, the feed amount of the filming screen portion of the film is not only always sent for each screen, but, for example, when the film is mounted on a stereo camera, the feed of one screen and the feed of three screens are alternately repeated. There is a need. At this time, by incorporating a counter device, a latch circuit, and the like into the film winding / unwinding device, it is possible to control the advance of the film screen by using the electrical connection between the stopper and the electrical contact.

Incidentally, instead of the above-described method in which the driving motor for positioning the film is once stopped and then reversed,
The film can be positioned by transmitting the power from the driving motor via an electromagnetic clutch or the like, and disconnecting the electromagnetic clutch after stopping the driving motor.

When a conventional film having holes formed on both sides in the feed direction at regular intervals is loaded into the film winding / rewinding device of the present invention, a counter device or the like is incorporated in the film winding / rewinding device. The number of times the stopper and the electrical contact are electrically connected is counted. Thus, in the case of a 35 mm wide film, for example, the number of times of the electrical connection is counted continuously eight times and stopped at the eighth position, whereby the feed of one screen can be controlled.

Thus, the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

[0032]

As described in detail in the above embodiment, the invention according to the first aspect locks the distal end of the stopper in a hole formed by opposing the both sides of the film. At the same time, since the tensile force is urged by the torsion spring interposed on the rewind shaft, the film can be accurately positioned on the photographing unit. In this manner, the holes formed so as to face both sides of the film can be positioned on the center line of the gap between the photographing screen portions of the film.

According to the second aspect of the present invention, when the motor is driven to rotate in the film winding direction, the pawl provided on the pulley of the winding shaft is engaged with the ratchet wheel. Rotate to wind up the film. When the motor is rotated in the rewinding direction, the film loaded on the rewinding shaft is rewinded by the toothed belt rotated by the motor, and the winding shaft is pulled.

At this time, the winding shaft is rotated by the pulling force of the film, the pulley rotates with the rotation of the toothed belt, and the rotation of the winding shaft is slower than the rotation of the pulley. The ratchet of the take-up shaft does not engage with the pawl, and the film is rewound. By rotating the motor in the forward or reverse direction, the film can be wound and rewound.

Thus, according to the present invention, the holes formed on both sides can be positioned on the center line of the gap between the photographing screen portions of the film. For example, when a positive film is used for the film, The present invention is an invention that has various effects such as being firmly and accurately mounted on a slide mount or the like.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the invention described in claim 1;

FIG. 2 is a front view when the back cover is removed in FIG. 1;

FIG. 3 is a cross-sectional plan view of a stopper according to another embodiment of the present invention.

FIG. 4 is a front view showing a film mounted on the film winding and rewinding device of the present invention.

FIG. 5 is a perspective view showing an embodiment of the invention described in claim 2;

[Explanation of symbols]

 41, 74 Film winding and rewinding device 42 Back cover 43 Rewinding shaft 45 Friction clutch 46 Torsion spring 47 Winding shaft 48, 73 Motor 50 Electrical contact 51, 59 Stopper 52 Film 53a, 53b Hole 62 Leader 68, 70 Pulley 69 Claw Car 71 claw 72 toothed belt

Claims (2)

(57) [Claims] 1. A rewind shaft and a take-up shaft are provided on the left and right sides of a photographing unit, and a film is punched on both sides in the feed direction and in a gap between photographing screen parts. In a film winding and rewinding device for loading the film on the rewinding shaft and transferring the film to the rewinding shaft, a friction clutch is provided on the rewinding shaft with a torsion spring interposed therebetween, and the rewinding shaft is wound. In the return direction, the motor is rotatably engaged with the take-up shaft in the forward and reverse directions, and when the film is loaded, the positions of the opposed holes are respectively passed. A film winding and rewinding device, wherein an electric contact is fixedly provided on one surface of the film, and a stopper is provided on the other surface of the film so as to urge the electric contact. 2. A ratchet mechanism is mounted on the take-up shaft, and a pawl projects from the inside of a pulley externally fitted to the take-up shaft to engage the pawl with the pawl. The pulley and the pulley provided on the rewinding shaft are wound by a toothed belt, and the toothed belt rotates forward and reverse by a motor drive, and the rewinding shaft and the winding shaft 2. The film winding and rewinding device according to claim 1, wherein the film winding device is rotatable in a winding direction or a rewinding direction.