JPH0625842B2 - Film winding device - Google Patents

Description

The present invention relates to a film winding device incorporated in, for example, an endoscope camera.

For example, in an endoscopic camera, the winding operation proceeds with closing the back cover, winding the leader, winding the frame, winding the trailer, and ending (stop). A cam lever is provided, and the state of the cam lever is detected by a photocoupler. Since the detection information of the photocoupler in the open state of the back cover and the detection state of the end state are exactly the same, it is not possible to know which state the detection information is alone. Therefore, when the cam lever returns to its original position due to the opening of the back cover, the photocoupler detects the winding state in the middle of each passing due to the passage of the cam lever and causes an unstable operation of starting each winding operation. There was an inconvenience.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a film winding device capable of surely executing a film winding operation from the leader portion winding to the end and a reset operation by opening the back cover. To do.

Hereinafter, a case where one embodiment of the present invention is incorporated into an endoscope camera will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a back cover provided at the opening of the cassette storage chamber. The back cover 1 has its lower end portion pivotally attached to a pivot shaft 2 provided in the camera body (not shown), and stores the cassette. It opens and closes the opening of the chamber. A slide plate 5 that moves vertically is provided at a side portion of the film cassette 3 that is close to the film winding portion 4, and an engagement operation as an engagement operation member that moves in parallel with the slide plate 5 is performed. A lever 6 is provided. Slide plate 5
Is urged upward by a spring 7, and the engagement operating lever 6 is urged upward by a torsion spring 8. Further, a projecting piece 9 is integrally formed on the upper side of the slide plate 5, and an upper end of the engaging operation lever 6 abuts on an abutting surface 10 composed of a lower end surface of the projecting piece 9 to regulate the position. There is. The lower end portion of the engagement operation lever 6 is bent and extended toward the lower side of the film winding portion 4 of the film cassette 3, and the film winding portion 4 is provided at the extending tip portion.
A push-up pin 12 for pushing up the inner cylinder 11 is provided, and an engaging claw 13 exposed on the upper surface of the film cassette 3 is provided at the upper end of the inner cylinder 11, and the engaging claw 13 is Winding claw 14 which will be described later when the cylinder 11 is pushed up
It hits and engages. The slide plate 5 is provided with a back lid opening knob 15 exposed to the outside of the camera body, and can be pushed down using the knob 15. The back cover 1 is opened in conjunction with the lowering of the slide plate 5 to open the opening of the cassette storage chamber. A lock lever 16 is provided between the back cover 1 and the slide plate 5. An abutting portion 18 that abuts a protrusion 17 provided on the back cover 1 is provided at the upper end of the lock lever 16, and the lower end of the lock lever 16 is engaged with a stopper edge 19 formed by cutting out the slide plate 5. The stopper portion 21 is formed. Further, the lock lever 16 is urged by a torsion spring 22 so that the abutting portion 18 is rotated in such a direction as to come into contact with the protrusion 17 side. Then, as shown in FIG. 1, when the back cover 1 is closed, the protrusion 17 abuts on the abutting portion 18, and the stopper end edge 19 moves to the stopper portion 2.
The lock lever 16 is rotated to a position where 1 is retracted. Further, when the slide plate 5 is pushed down, the protrusion 17 of the back cover 1 retreats from the lock lever 16 and
Since the stopper end edge 19 is lowered, the lock lever 16 is rotated by the torsion spring 22 so that the stopper portion 21 abuts against the stopper end edge 19 and is locked, thereby preventing the slide plate 5 from rising and returning. There is. When the back cover 1 is closed, the protrusion 17 pushes the abutting portion 18, so that the lock lever 16 rotates to release the engagement. Therefore, the slide plate 5 is automatically raised and returned by the urging force of the spring 7. The engaging operation lever 6 is moved in accordance with the ascending / descending operation of the slide plate 5 to operate the ascending / descending operation of the inner cylinder 11. The transmission gear 2 is provided on the upper end of the slide plate 5.
3 is provided with a projecting piece portion 25 that forms a rack gear 24 that engages with 3. The transmission gear 23 has a rack gear 27 formed at one end of a slide plate 26 for closing the back cover.
When the transmission gear 23 rotates, the slide plate 26 moves in parallel with the back cover 1. A locking piece 28 is formed at the other end of the back cover closing slide plate 26, which can be engaged with a locking claw 29 provided on the back cover 1. That is, when the back cover closing slide plate 26 moves in the direction of the arrow due to the rotation of the transmission gear 23 when the slide plate 5 descends, the engagement is disengaged, and when the back cover closing slide plate 26 moves and returns in the opposite direction, it is engaged. It is like this.

On the other hand, the winding shaft 31 having the winding claw 14 is connected to the winding motor 33 via a gear train 32 composed of a plurality of spur gears, and the rotation of the winding motor 33 is decelerated by the gear train 32 to receive the film. The hoisting unit 4 of the cassette 3 is hoisted and driven. Further, one gear 34 of the intermediate gears of the gear train 32 is configured to make one rotation corresponding to one frame feed. And
As shown in FIGS. 6 and 8, the gear 34 has a long hole 35 formed in its peripheral portion. A photocoupler 36 as a detector is installed at a position corresponding to the locus through which the long hole 35 passes when the gear 34 rotates.
The rotation of the hoisting motor 31 is stopped by detecting that the gear 34 has made one rotation by detecting 5. Further, the gear 34 is formed of a metal material into a disk shape, for example, but as shown in FIG. 8, a press-fitting hole 37 is formed in the center thereof, and a tooth portion 38 is formed on the entire circumference in the peripheral portion. Has been formed. The elongated hole 35 is arranged in the peripheral portion between the press-fitting hole 37 and the tooth portion 38. The elongated hole 35 is formed long along the circumferential direction of the gear 34. The pinion gear 3 is inserted into the press-fitting hole 37.
The fitting protrusion 41a of 9 is press-fitted and fixed.

Further, the right and left peripheral surfaces of the elongated hole 35 are colored black, and the colored portion 40 prevents reflection at the position of the elongated hole 35. That is, the difference between the output of the photocoupler 36 at the position of the slot 35 and the output other than the slot 35 can be increased. Therefore, the detection of the long hole 35 is stable and can be surely detected.

On the other hand, the shaft 41 of the gear 34 is extended upward,
An intermediate portion of the reset lever 42 is loosely attached to this intermediate portion so that it can freely rotate. Furthermore, the shaft 4
A piece feeding claw 43 is attached and fixed to the upper end of 1.
The piece feeding pawl 43 is adapted to rotate the ratchet wheel 44 on the piece number side. The above frame counter is configured as follows. That is, ratchet wheel 4
4 is attached and fixed to the shaft 46 of the frame number plate 45, and is rotated by one tooth for each rotation of the frame feed claw 43, so that the frame number plate 45 is rotated by one frame scale. Has become. The piece number plate 45 is formed in a disk shape, but a large-diameter protruding portion 47 as a detected portion is formed corresponding to, for example, 16 or more piece number scales. The large-diameter protruding portion 47 is arranged to be detected at a position facing the first photocoupler 49 as a detection unit for detecting the remaining number warning when the number on the frame number scale 48 becomes 16 or more. There is. Further, when the first photocoupler 49 detects the large-diameter protruding portion 47, the signal is used to control, for example, the indicator lamp in the finder to blink so as to notify that the number of remaining frames has decreased. Constitutes a means.

Further, the coil spring 5 for urging is attached to the shaft 46 of the piece number plate 45.
1 is wound and biases the piece number plate 45 and the shaft 46 in a direction to rotate clockwise. Further, a locking claw 52 for preventing reverse rotation is hooked on the ratchet wheel 44 to prevent reverse rotation of the ratchet wheel 44. The locking claw 52 is used for the reset lever 4
2 is configured to be released by a release arm 53 formed to project.

A discriminating cam 54 is attached and fixed to the lower end of the shaft 46 of the frame number plate 45. The discriminating cam 54 is formed in the shape shown in FIG. That is, the first cam surface A corresponding to the leader portion of the film, the second cam surface B corresponding to the portion up to 20 frames, the third cam surface C corresponding to the trailer portion, and the fourth cam surface corresponding to the end portion. Cam surface D is formed in the order of its rotation direction, and is formed so as to have a successively smaller diameter. The cam lever 5 is provided on the circumferential surface of the cam 54.
The cam follower portion 56 of No. 5 is elastically joined.

The cam lever 55 has an intermediate portion pivotally supported,
The cam follower portion 56 is biased by the torsion spring 57 so as to hit and follow the cam peripheral surface of the cam 54. The other end of the cam lever 55 constitutes a detected portion 58, which is a second and third pair of detectors (detection portions) arranged side by side on a straight line passing through the rotation center of the cam lever 55. Are optically detected by the photo couplers 59 and 60. That is, the detected part 58 is formed of a pair of left and right plate parts 61 and 62 as shown in FIG. 2, and the second plate part 62 on the tip side is the first plate on the base end side. The cam lever 55 is displaced toward the rotation direction side of the cam lever 55 from the portion 61. When one of the plate portions 61, 62 faces one of the corresponding photocouplers 59, 60, the other plate portion 61, 62 does not face the other photocoupler 59, 60 (see FIG. 2, (Fig. 4)
It is possible to select a state in which the photocouplers 59 and 60 face both plate portions 61 and 62 (FIG. 3). Further, the cam lever 55 is provided with a pin 64 for receiving the reset operation end 63 of the reset lever 42,
The cam lever 55 against the biasing force of the torsion spring 57.
It can be rotated to retract it to the position shown by the chain double-dashed line in FIG.

Further, a rack 65 that engages with the transmission gear 23 is provided at the other end of the reset lever 42, and is oscillated by the rotation of the transmission gear 23.

Next, the operation of the film winding device will be described. First, when the film cassette 3 is stored in the cassette storage chamber, the slide plate 5 is pushed down by the back cover opening knob 15. In conjunction with this, the back cover 1 is opened, and the lock lever 16 is rotated, and the stopper portion 21 of the lock lever 16 falls into the stopper end edge 19 and locks the stopper plate 21 to prevent the slide plate 5 from rising and returning. Further, as the slide plate 5 descends, the rack gear 24 rotates the transmission gear 23 to move the back cover closing slide plate 26 to move the locking piece 28 from the locking claw 29 of the back cover 1. remove. Therefore, the back cover 1 can be opened as described above. Further, as the slide plate 5 descends, the engaging operation lever 6 that abuts against the abutting surface 10 also descends, and the push-up pin 12 is retracted by being retracted into the bottom of the cassette storage chamber. In addition, the rotation of the transmission gear 23 causes the reset lever 4 to move.
2 also rotates, the locking claw 52 is rotated by the release arm 53 thereof to be separated from the ratchet wheel 44, and the cam lever 55 is rotated by the reset operation end 62 to the position shown by the chain double-dashed line in FIG. 55 is completely separated from the peripheral surface of the discrimination cam 54). Then, since the ratchet wheel 44 is released, the piece number plate 45 and the discrimination cam 54 are rotated by the biasing coil spring 51 and returned to the standby position shown by the solid line in FIG.

On the other hand, load the film cassette 3 into the cassette storage chamber,
When the back cover 1 is closed, its protrusion 17 hits the abutting portion 18 of the lock lever 16 to release the slide plate 5. Therefore, the slide plate 5 is returned to ascend, the transmission gear 23 is rotated, and the engagement operation lever 6 is returned to ascend to follow the abutting surface 10, and the push-up pin 12 causes the inside of the film cassette 3 to move. The cylinder 11 is pushed up, and the engaging claw 13 is locked to the winding claw 14. However, the engaging claws 13 and the winding claws 14 may not be properly engaged with each other, and the top surfaces of the tooth portions may abut against each other. However, in this case, the engagement operating lever 6 does not follow the abutting surface 10 of the slide plate 5 while following it, and the movement of the slide plate 5 is not restricted as it is. That is, the case back 1 is normally closed. Then, as will be described later, the winding claw 14 is completely engaged immediately after the rotation for feeding the leader portion, and the film is normally wound.

Further, the transmission plate 2 is moved by the slide plate 5 being raised.
When 3 rotates, the back cover closing slide plate 26 moves,
The locking piece 28 is locked to the locking claw 29 of the back cover 1. That is, the case back 1 is locked in the closed state. Further, the reset lever 42 is also rotated clockwise and separated from the locking claw 52 and the cam lever 55. Therefore, the locking claw 52 is locked to the ratchet wheel 44, and the cam lever 5
As shown in FIG. 2, the cam follower portion 5 is in contact with the first cam surface A of the discriminating cam 54 and stands by. As a result, the second photocoupler 59 faces the first plate portion 61 and detects it, but the second photocoupler 60 is in the non-detection state. Further, the first photo coupler 49 is naturally in the non-detection state. That is, the combination signal in the table is obtained. Signal, the winding motor 33 receives a command from the control unit that the winding motor 33 continues to rotate, and the winding motor 33 continues to rotate.

Then, the leader section feeding operation is started. That is, the rotation of the winding claw 1 is performed via the gear train 32 and the winding shaft 31.
4 and the inner cylinder 11 through the engaging claw 13 that engages with the inner cylinder 11.
To rotate. In this way, the leader portion of the film is wound up. Further, during the feeding operation, the gear 34 in the middle of the gear train 32 rotates, but at that time, the piece feeding claw 43 rotates together with the gear 34 via the shaft 41, and the ratchet wheel 44 rotates one tooth at a time. When the leader portion is fed by a predetermined number of frames, for example, three frames, the discriminating cam 54 also rotates and enters the state shown in FIG. That is,
The cam lever 55, which hits the first cam surface A until then, comes off the first cam surface A and now hits the second cam surface B. Then, the cam lever 55 also rotates the lift differentially,
The first and second plate portions 61 and 62 of the detected portion 58 are the second
And the third photocouplers 59 and 60, respectively. That is, the detection state shown in the above table is obtained. Then, when the signal of the long hole 35 coming after the signal of is input is detected, the operation of the hoisting motor 33 is immediately stopped. Thereafter, the winding motor 33 automatically operates each time the release signal is received, and when the gear 34 makes one rotation and the slot 35 detects the photo coupler 36, the feeding operation is stopped. Every time. When 15 frames are photographed and the 16th frame is fed in this way, the large-diameter protruding portion 47 of the frame number plate 45 comes to face the first photocoupler 49. 49
Is in the detection state. Then, the indicator light in the finder blinks to notify that the number of remaining frames is low.

Further, when shooting is continued and 20 images have been used up, the cam follower portion 56 of the cam lever 55 falls on the third cam surface C of the discrimination cam 54, the cam lever 55 rotates a fixed amount, and the state shown in FIG. Becomes Therefore, the first plate portion 61 is separated from the second photo coupler 59, and the second plate portion 61 faces the third photo coupler 60. Therefore, the detection state of the above table is obtained. In response to this signal, the control section operates the hoisting motor 33 to perform the trailer section feeding which continues feeding for three frames, for example.
When the trailer feed is completed, the discriminating cam 54 rotates a fixed amount to drop the cam follower portion 56 of the cam lever 55 onto the fourth cam surface D, and the cam lever 55 becomes the state shown in FIG. That is, both the second and third photocouplers 59 and 60 are separated from the detected object 58 and are in the non-detected state. Further, at this time, the first photo coupler 4
9 detects the large-diameter protruding portion 47. Therefore, it is shown in the end state in the above table. Then, this is recognized by the control unit.

With the above, one operation is completed. Therefore, when taking out the film cassette 3, the back lid 1 is opened and taken out by pushing down the back lid opening knob 15 as described above. At this time, the reset operation is performed as described above.

By the way, as shown in the table above, each of the five states is
It is determined by the second and third photo couplers 49, 59 and 60. Second and third photocouplers 59, 6
According to only 0, the states of and become the same detection contents when the operation is stopped.
9,60 is enough. However, in this case, since the cam lever 55 moves in the reverse direction in the order of →→→→ at the time of resetting, the hoisting motor 33 moves in the state described above. Therefore, in the present invention, the program is set so that the winding motor 33 does not move until the rear cover is opened once the end state is reached. And
In order to distinguish the above states, the first photocoupler 49 detects the large-diameter protruding portion 47 of the piece number plate 45 to distinguish the respective states.

As described above, the present invention detects the five states of the back lid open state, the film leader section feeding state, the photographing frame section feeding state, the trailer section feeding state, and the film end state, and the back lid opening state and the film. Two detection units, a first detection unit and a second detection unit, which detect the end state as the same detection state, are provided, and in order to distinguish between the two identical detection states, a signal from the frame number remaining amount warning means is used to perform control. The department distinguishes between the two states. Therefore, the five states of the back cover open state, the film leader section feeding state, the photographing frame section feeding state, the trailer section feeding state, and the film ending state can be reliably distinguished and detected, and each operation can be accurately executed. Furthermore, since the output of the detection means for warning the number of remaining frames is used for state detection, the number of detection (unit) parts themselves can be reduced, the number of parts can be reduced, and the weight and size of the camera can be reduced. Can be achieved.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a perspective view of the film winding device, and FIGS. 2 to 5 are plan views showing the operation sequence of a mechanism portion for detecting the winding state, respectively. 6 is a plan view of the frame feed detecting portion, FIG. 7 is a side view thereof, and FIG. 8 is a developed sectional view thereof. DESCRIPTION OF SYMBOLS 1 ... Back cover, 33 ... Winding motor, 42 ... Reset lever, 45 ... Frame number plate, 47 ... Large diameter protrusion, 49 ... First photo coupler, 55 ... Cam lever, 59 ... Second photo coupler, 60 ... Third photo coupler.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-113921 (JP, A) JP-A-58-46928 (JP, A) Practical application Sho-56-66929 (JP, U)

Claims (1)

[Claims] Claims: 1. A frame counter rotating with a frame feeding operation, a cam interlocking with the frame counter, and a cam which is interlocked with the cam and the back cover to move the back cover open state, the film leader section feed state,
It consists of a cam lever that takes 5 different positions, one for the shooting frame, one for the trailer, and one for the end of the film, and the first and second detectors for detecting the position of this cam lever. And the film end state are the same detection state, and other film leader feeding state, photographing frame portion feeding state, trailer portion feeding state, and detection means that can be discriminated as four detection modes, and the rotational position of the frame number counter A third detector for detecting whether or not the number of photographed frames is equal to or more than a predetermined number of frames, and a warning for giving a remaining number warning in response to the detection of the predetermined number of frames by the third detector. Means and a controller for controlling the frame feed according to the status signal from the detecting means and for receiving the outputs of the detecting means and the third detecting portion to discriminate between the back cover opened state and the film finished state. Characterized by having Film winding apparatus.