JPS59232322A - Film winding device - Google Patents

Abstract

PURPOSE:To detect surely a small hole by subjecting a surface part, which faces a photocoupler, around the small hole of an operating body with a non-reflective processing. CONSTITUTION:The rotation of a winding motor 33 is decelerated and is transmitted to a winding shaft 31 having a winding pawl 14 through a gear train 32 consisting of plural spur gears to drive a winding part 4 of a film cassette 3. A gear 34 of the gear train 32 is so constituted that it is rotated once in accordance with feeding of one frame, and a long hole 35 is provided as the small hole in the peripheral part. A photocoupler 36 is provided in the position which the long hole 35 passes through the gear 34 is rotated, and the photocoupler 36 detects one rotation of the gear 34 to stop the rotation of the winding motor 31. The surface part around the long hole 35 is colored black, and reflection is suppressed by this colored part 40 to increase a difference between the output of the photocoupler in the position of the long hole 35 and the output on the surface other than the long hole 35. Consequently, detection of the long hole 35 is stabilized and assured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film winding device incorporated into, for example, an endoscopic camera.

For example, when winding a film in the endoscopic camera 2, a small hole is provided in one gear of a gear train that transmits the rotation of the winding motor to the film winding shaft, and passage through this small hole is detected by a photocoupler. , to stop winding. However, the above-mentioned small holes can only be made with an extremely small diameter due to the space available.

Therefore, when detecting the small hole with a photocoupler,
The ratio of the detection output at the position of the small hole and the detection output at the reflective surface other than the small hole was small, and the detection was unstable.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to securely fill the small hole with a photocoupler even if only an extremely small hole can be made in the operating body that transmits the winding motion due to space considerations. The object of the present invention is to provide a film winding device that can detect

Hereinafter, a case where an embodiment of the present invention is incorporated into an endoscope camera will be described based on the drawings.

Reference numeral 1 in FIG. 1 is a back cover provided at the opening of the cassette storage chamber, and the lower end of this back cover 1 is pivotally connected to a pivot shaft 2 provided on the camera body (not shown), and the cassette storage chamber is It is designed to open and close the opening of the chamber. A slide plate 5 that moves in the vertical direction is provided at a side portion of the film cassette 3 close to the film winding section 4, and is still used as a locking operation member that moves in parallel with the slide plate 5. A lever 6 is provided. Slide plate 5
is urged upward by a tension coil spring 7, and the engagement operation lever 6 is urged upward by a torsion spring 8. Further, a protruding piece 9 is integrally formed on the upper side of the slide plate 5, and the upper end of the engagement operation lever 6 comes into contact with the abutting surface 10 consisting of the lower end surface of the protruding piece 9, thereby regulating the position. ing. Lower end of the locking operation lever 6'
is bent and extended toward the lower side of the film winding section 4 of the film cassette 3, and a push-up pin 12 for pushing up the inner cylinder 11 of the film winding section 4 is provided at the tip of this extension. There is. An engaging claw 13 is provided at the upper end of the inner cylinder 11 and is exposed on the upper surface of the film cassette 3. When the inner cylinder 11 is pushed up, the engaging claw 13 hits and engages with a winding claw 14, which will be described later. It has become. The slide plate 5 is provided with a back cover opening knob 15 exposed outside the camera body, and can be pushed down using this knob 15. The back cover 1 is opened to open the opening of the cassette storage chamber. Further, a lock lever 16 is provided between the back cover 1 and the slide plate 5. This lock lever
The upper end of the lock lever 16 is provided with an abutment part 18 that contacts a protrusion 17 provided on the back cover 1, and the lower end of the lock lever 16 is provided with a stopper part 18 that engages with a stopper edge 19 formed by cutting out the slide plate 5. 21. Further, the lock lever 16 is biased by a screw spring 22 so that the abutting portion 18 rotates in a direction in which the abutting portion 18 comes into contact with the protrusion 17 side.

When the back cover 1 is closed as shown in FIG.
16 is rotated. Furthermore, when the slide plate 5 is pushed down, the protrusion 17 of the back cover 1 retreats from the lock lever 16 and the stopper edge 19 descends, so the lock lever 16 is rotated by the twisting spring 22 and the stopper part 21 is moved. It abuts against the stopper edge J9 and is locked to prevent the slide plate 5 from returning upward.

Further, when the back cover 1 is closed, the protrusion 17 presses the abutting portion 18, so that the lock lever 16 rotates and releases the engagement. Therefore, the first slide plate 5 is automatically raised and returned to its original state by the biasing force of the tension coil spring 7. In addition, the above slide plate 5
The locking operation lever 6 moves in response to the lifting and lowering movements of the inner cylinder 11, thereby lifting and lowering the inner cylinder 11. A projecting piece 25 is provided at the upper end of the slide plate 5 and has a rack gear 24 that engages with the transmission gear 23 . A rack gear 27 formed at one end of the back cover closing slide plate 26 is still engaged with the transmission gear 23, and when the transmission gear 23 rotates, the slide plate 26 moves parallel to the back cover 1. do. A locking piece 28 is formed at the other end of the back cover closing slide plate 26, and can be secured to a locking pawl 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 as the slide plate 5 descends, it is disengaged, and when it moves back in the opposite direction, it is engaged. It became like this.

ing.

On the other hand, the winding shaft 31 having the winding pawl 14 is connected to a winding motor 33 via a transmission mechanism, for example, a gear train 32 consisting of a plurality of spur gears, and the rotation of the winding motor 33 is slowed down by the gear train 32. The winding unit 4 of the film cassette 3 is driven to wind up the film cassette 3. Further, one gear (operating body) 34 among the intermediate gears of the gear train 32 is configured to rotate once in response to one frame feed. As shown in FIGS. 6 and 8, this gear 34 has a long hole 3 as a small hole in its periphery.
5 is drilled. A photocube 236 as a detector is installed at a position corresponding to the trajectory of the elongated hole 35 when the gear 34 rotates, and by detecting the elongated hole 35, it is detected that the gear 34 has rotated once. Then, the rotation of the hoisting motor 31 is stopped. The gear 34 is formed of a metal material in the shape of a disk, and as shown in FIG. 8, a press-fitting hole 37 is formed in the center, and teeth 38 are formed around the entire circumference. It is formed. The elongated hole 35 is arranged in the circumference between the press-fitting hole 37 and the tooth portion 38 . Above long hole 3
5 is formed long along the circumferential direction of the gear 34.

That is, it is formed to be elongated along the moving direction of the gear 34. The fitting protrusion 41a of the pinion gear 39 is press-fitted into the press-fitting hole 37, and the fitting is fixed. In addition,
To give an example of specific dimensions, the diameter of the gear 34 is 1
The diameter of 2-6+mn+binion gear 39 is 4.3t
The tooth depth of the tooth portion 38 is 0.65 mm, and the elongated hole 3
The length along the center line of 5 is 2.5? I+++1. Long hole 3
The width of 5 is 2 mm. Further, the angular interval between the elongated holes 35 is long, and the angle formed by two straight lines on the center line of the elongated holes 35 passing through both ends of the elongated holes 35 toward the center of the gear 38 is 30°. Further, the diameter of the press-fitting hole 37 is two-tone.

Furthermore, the periphery of the elongated hole 35, particularly the peripheral surface portions on the left and right sides thereof, are each colored black, and this colored portion 40 suppresses reflection at the position of the elongated hole 35. In other words, by applying non-reflective treatment, the output of the photocoupler 36 at the position of the elongated hole 35 and the elongated hole 35 are
The difference in output on other surfaces can be increased. therefore,
The long hole 35 can be detected stably and reliably.

On the other hand, the shaft 41 of the gear 34 extends upward,
A middle part of the reset lever 42 is freely attached to any middle part so as to be freely rotatable. Furthermore, the shaft 4
A frame feeding claw 43 is fixedly attached to the upper end of 1.
A ratchet wheel 44 is rotated by this frame feeding pawl 43. The ratchet wheel 44 is fixedly attached to the shaft 46 of the frame number plate 45, and is rotated by one tooth each time the frame feeding pawl 43 rotates once, thereby rotating the frame number plate 45 by one frame scale. It is designed to let you do so. The piece number plate 45 is formed into a disk shape, and a large diameter protrusion 47 corresponding to a piece number scale of 16 or more pieces, for example.
is formed. When the number on the frame number scale 48 reaches 16 or more, this large-diameter protrusion 47 is positioned opposite to a first photocoupler 49 for detecting the number remaining and is detected. In addition, this first photocoupler 49
When the large-diameter protrusion 47 is detected, this signal is used to control, for example, an indicator light in the finder to blink, thereby informing that the number of frames remaining is low.

The biasing coil spring 5 is still attached to the shaft 46 of the piece number plate 45.
1 is wound around the frame, and urges the frame number plate 45 and the shaft 46 to rotate clockwise. Furthermore, a locking pawl 52 for preventing reverse rotation is engaged with the ratchet wheel 44 to prevent the ratchet wheel 44 from reversing. Note that the locking pawl 52 is connected to the reset lever 4.
It is configured to be released by a release arm 53 formed protruding from 2.

A discrimination cam 54 is fixedly attached to the lower end of the shaft 46 of the frame number plate 45. This discrimination cam 54 is formed in the shape shown in FIG.

That is, the first cam surface A corresponds to the league portion of the film, the second cam surface B corresponds to the portion up to 20 frames, the third cam surface C corresponds to the railer portion, and the third cam surface C corresponds to the end portion of the film. The four cam surfaces are formed in the order of their rotational directions, and are formed to have smaller diameters in turn. This cam 54
The cam follower portion 56 of the cam lever 55 is attached to the cam peripheral surface of the cam follower portion 56 of the cam lever 55.
are joined elastically.

The cam lever 55 is pivotally supported at its middle portion, υ,
A threaded spring 57 urges the cam follower portion 56 to contact 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 comprised of a pair of detectors 59, which serve as a pair of detectors installed in a straight line passing through the center of rotation of the cam lever 55. .60 and is optically detected. That is, the detected portion 58 is a pair of plate portions 61 and 62 shifted left and right as shown in FIG.
The second plate portion 62 on the distal end side is shifted further in the rotational direction of the cam lever 55 than the first plate portion 61 on the base end side. When one of the plate parts 61, 62 faces one of the corresponding photocouplers 59, 60, the other plate part 61, 62 faces the other photocoupler 59, 62.
0 (FIGS. 2 and 4) or a state in which the photocoupler 59.60 faces both plate portions 61.62 (FIG. 3) can be selected. In addition, Kamureno-55
is provided with a pin 64 for receiving the reset operation end 63 of the reset lever 42, and the cam lever 55 is rotated by the reset lever 42 against the biasing force of the torsion spring 57, as shown by the two-dot chain line in FIG. It is designed so that it can be evacuated to a certain position.

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

Next, the operation of the film winding device will be explained. First, when storing the film cassette 3 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 opens, and
When the lock lever 16 rotates, its stopper portion 21 falls onto the stopper edge 19 and locks therein, thereby preventing the slide plate 5 from returning upward. In addition, the slide plate 5
As the camera lowers, the transmission gear 23 is rotated by the rack gear 24, the back cover closing slide plate 26 is moved, and the locking piece 28 is removed from the locking claw 29 of the back cover 1. Therefore, the back cover 1 can be opened as described above.

Further, as the slide plate 5 descends, the engagement operation lever 6 that is in contact with the abutment surface 10 also descends, and the push-up bottle 12
will be evacuated by sinking into the bottom of the cassette storage chamber. Also, by rotating the transmission gear 23, the series reset lever is
42 also rotates, and its release arm 53 rotates the locking pawl 52 to separate it from the ratchet wheel 44, and the reset operation end 62 rotates the cam lever 55 to the position shown by the two-dot chain line in Fig. 82 (the cam lever 55 completely separates from the circumferential surface of the discrimination cam 540). However, since the ratchet wheel 44 is released, the biasing coil spring 51 causes the frame number plate 45 and the discrimination cam 54 to rotate and return to the standby position shown in FIG.

Meanwhile, load film cassette 3 into the cassette storage chamber,
When the back cover 1 is closed, the protrusion 17 releases the system slide plate 5 against the abutting portion 18 of the lock lever 16. Therefore, the slide plate 5 returns to the upper position, rotates the transmission gear 23, and the locking operation lever 6 returns to the upper position following the abutting surface 1o, and the pusher bin 12 moves the film cassette 3 Push up the inner cylinder 11 and lock the engaging pawl 13 with the winding pawl 14.

In addition, by raising the slide plate 5, the transmission gear 2
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. In other words, the back cover 1 is locked in the closed state. Further, the reset lever 42 is also rotated clockwise and separated from the locking pawl 52 and the cam lever 55. Therefore, the locking pawl 52 locks on the ratchet wheel 44, and the cam lever 5
5, its cam follower portion 56 is currently waiting on the first cam surface A of the discriminating cam 54, as shown in FIG. As a result, the second photocoupler 59 faces the first plate portion 61 and detects it, but the second photocoupler 60 is in a non-detecting state. Moreover, the first photocoupler 49 is also naturally in a non-detecting state. In other words, the combination signal (■) in the table is obtained.

This signal causes the winding motor 33 to rotate and start the leader section feeding operation. The rotation is transmitted to the winding pawl 14 via the gear train 32 and the winding shaft 31,
The inner cylinder 11 is rotated via the engaging claw 13 that engages with this. In this manner, the leader portion of the film is wound.

Also, during the feeding operation, the gear 34 in the middle of the gear train 32 rotates, but the number of times it passes through the long hole 35 is 7 times.
The amount of feed is detected by detecting the amount of feed. In this case, one rotation of the gear 34 corresponds to one frame advance. When this frame feeding is performed, the frame feeding pawl 43 rotates together with the gear 34 via its shaft 41, thereby rotating the ratchet wheel 44 one tooth at a time.

When the leader section is fed by a predetermined number of frames, for example three frames, the discrimination cam 54 also rotates to the state shown in FIG. 3. That is, the cam lever 55, which had been in contact with the first cam surface A, comes off the first cam surface A and now comes into contact with the second cam surface B. Accordingly, the cam lever 55 also rotates by the lift difference, and the first and second plate portions 6 of the detected portion 58 are rotated.
1 and 62 face both the second and third photocouplers 59 and 60, respectively. In other words, in the above table, the detection state is ``■''. When this state occurs, the operation of the hoisting motor 33 is immediately stopped. After this, the winding motor 33 is automatically operated every time a release signal is received, and the gear 34 rotates once and the elongated hole 35 is connected to the photocoupler 3.
When detected at step 6, the frame feeding operation is stopped, and a one-frame feeding operation is performed each time. In this way, you can take up to 15 photos and 16
When performing the komagomeshi of the piece number board 450 large diameter protrusion part 47
is now located opposite the first 7 Oto coupler 49,
The first photocoupler 49 enters the detection state.

Then, the indicator light in the finder blinks to notify that the number of frames remaining is low.

Furthermore, when shooting continues and 20 images are used up, the cam follower portion 56 of the cam lever 55 falls onto the third cam surface C of the discrimination cam 54, and the cam lever 55 rotates a certain amount, resulting in the state shown in FIG. becomes. Therefore, the first plate part 61 comes off from the second photocoupler 59, and the second plate part 6no remains opposed to the third photocoupler 6o. Therefore, the detection state shown in Table 2 is obtained. In response to this signal, the control section operates the hoisting motor 33 to continue transporting the trailer by, for example, three frames.

When this trailer part feeding is completed, the discrimination cam 54 rotates by a certain amount and the cam follower part 56 of the cam lever 55 falls onto the fourth cam surface, and the cam lever 55 is in the state shown in FIG. Ru. The coupling, second and third photocouplers 59 and 60 are both separated from the detected portion 58 and enter a non-detecting state.

Furthermore, at this time, the first photocoupler 49 is detecting the large diameter protrusion 47 . Therefore, the end state is indicated by ■ in the table above. This is recognized by the control unit.

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

In the above embodiments, the peripheral surface of the small hole, that is, the long hole, is colored black as a non-reflective treatment, but the present invention is not limited to this, and other treatment means may be used.

As explained above, in the present invention, since the surface portion located around the small hole provided in the operating body that transmits the winding motion and facing the photocoupler is treated to be non-reflective, only a small hole is required in the operating body in terms of space. Even if the hole cannot be drilled, it is possible to increase the difference between the output at the small hole and the output at a portion other than the small hole.

In other words, passage through the small hole can be reliably detected.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view of the film winding device, FIGS. 6 is a plan view of the frame feed detection section, FIG. 7 is a side view thereof, and FIG. 8 is a developed sectional view thereof. 32... Gear train, 33... Winding motor, 34...
・Gear, 35... Long hole, 36... Photocoupler, 4
゜・・・Colored part. Applicant's agent Patent attorney Takehiko Suzue -177- Figure 6 Figure 7.1 636 11iJiF11 ,! 5s, %'1. -',. Director of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case, Patent Application No. 1983-107364 2, Name of the invention Film winding device 3, Person making the amendment Relationship to the case Percentage Applicant (037) Olympus Optical -1- Business stock exchange 4, agent, auxiliary market image 7, contents of amendment (1) For details, page 3, line 4, page 5, line 8, “
Delete "Tension Coil". (2) In the first line of page 5, correct the phrase ``Twisting the first twist'' to ``Twisting.'' C3) “...” on page 14, line 16 (last line)
I get a signal. '' is followed by ``With the signal ■, the hoisting motor 33 receives a command from the control unit to continue rotating, and the hoisting motor 33 continues to rotate.'' is added. (4) The number of times the winding motor 33 rotates due to this signal, and the number of times it passes through the long hole 35 in the first and second lines of the 15th screen is . . . when performing this frame advance. Correct it “at that time”. (6) On page 16, lines 15 and 16: [When this state occurs, the operations of... are stopped. " is corrected to "When the next signal from the elongated hole 35 is detected after the signal (■) is input, the operation of the hoisting motor 33 is immediately stopped." (7) Correct the part 32 in Figure 1 as shown in the attached sheet. Figure 2

Claims (1)

[Claims] In a film winding device in which a small hole is provided in the operating body that transmits the winding operation, and the winding operation is stopped by detecting this small hole with a photocoupler located around the small hole and connected to a photocoupler. A film winding device characterized in that opposing surface portions are subjected to non-reflective treatment.