JPH06301159A - Hook detecting device for photographic film on spool - Google Patents

Abstract

PURPOSE:To surely detect whether the rear end section of a film is hooked on a spool or not. CONSTITUTION:A film sensor 60 is provided between a spool 12 and a pair of film feed rollers 50. A pair of film feed rollers 50 are normally or reversely rotated by a motor 52 via a hysteresis clutch 51. The time until a film rear end section 24a is hooked on the hook claw 21 of the spool 12 after a film is delivered to the spool 12 side is measured, and a pair of film feed rollers 50 are reversely rotated after this time elapses. The hysteresis clutch 51 reverses a pair of film feed rollers 50 with the torque nearly a half of that at the time of normal rotation, and it pulls the film in the returning direction. If the film sensor 60 detects no film when the prescribed time elapses after the start of this pulling, it judges the film to be in the defective hook state, and it issues an alarm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to detection of locking of a photo film on a spool for detecting whether or not the photo film is locked on the spool when the photo film is wound on the spool when assembling the photo film cartridge. It relates to the device.

[0002]

2. Description of the Related Art The most popular type 135 photo film cartridge has a thin metal plate cartridge body and two.
The cartridge body is composed of two caps, and the spool around which the photo film is wound is stored in it. As a method of assembling this photo film patrone,
As is known from Japanese Examined Patent Publication No. 2-691, a photo film is wound around a spool, prepared, and assembled by wrapping it in a Patrone body by working in a dark room. Further, Japanese Examined Patent Publication No. 60-48748. As described above, there is a method of reassembling the patrone body by partially disassembling the assembled patrone body at the photo film installation part in the darkroom, and putting a spool around which the photo film is wound in the patrone body.

In Japanese Patent Laid-Open No. 49-107732 and Japanese Patent Laid-Open No. 52-77723, a film cartridge formed in the film cartridge body is prepared in advance in a bright room. Insert a tongue-shaped guide plate into the passage, and use this as a guide to insert the photo film into the main body of the cartridge from the rear end side.After locking the rear end of the photo film to the spool, slide the spool. It rotates so that the photo film is wound around the cartridge body.

According to US Pat. Nos. 4,834,306, 4,846,418, and Japanese Patent Laid-Open No. 3-37645 by the present applicant, the cartridge body is assembled with a resin molded product and the spool body is assembled. A photographic film cartridge having a function of sending the photographic film out of the body of the cartridge by rotation is known. Unlike the previous ones, this photo film patrone does not project the leader part of the photo film from the patrone main body in both unused condition and used condition, so that the photo film can be stored more tightly and before and after use. Has the advantage of being easy to handle.

However, in the case of a photographic film cartridge having a function of feeding a photographic film by rotating the spool, for example, the film passage formed in the main body of the cartridge has a structure that can be opened and closed by a light shielding lid, or a display member before and after use is incorporated in the main body of the cartridge. In addition to this, considering that the structure disclosed in Japanese Patent Laid-Open No. 1-306845 and U.S. Pat. No. 5,049,912 is used, the number of components of the Patrone body increases. Therefore,
It is difficult to improve the production efficiency by the method of disassembling and assembling the main body of the cartridge in the dark room for incorporating the photographic film. Even if this assembly work is automated, there are many problems in terms of workability in consideration of measures against failures.

Further, as described above, in the case where the tongue-shaped guide plate is inserted into the film passage and the rear end of the photographic film is locked to the spool, the assembly of the cartridge body can be performed in a bright room, Since the plate merely guides the insertion of the rear end of the photo film at the entrance of the film passage, another step is taken in the process of inserting the photo film into the cartridge body before the rear end reaches the locking part of the spool. There is a great risk of bending or breaking in the direction, and there is still a problem in workability.

Therefore, the applicant of the present invention provides a film locking hole in the rear end portion of the photographic film in addition to the hole for locking the locking portion of the spool, and the hook of the film insertion guide is provided in this locking hole. Has been proposed, the rear end of the film is forcibly fed to the locking portion of the spool, the rear end of the film is locked to the spool, and a method and apparatus for winding the photo film on the spool are proposed. (For example, Japanese Patent Application No. 4-212135
issue).

By the way, in order to detect whether or not the rear end portion of the film is locked to the spool, for example, the actual opening 63-
As disclosed in Japanese Patent No. 115145, there is one in which a photo sensor detects a slit penetrating end of a rear end portion of a film inserted in a slit of a spool. In addition, JP-A-1-
As shown in Japanese Patent No. 285937, there is a method in which the amount of protrusion from the spool at the slit penetrating end of the film rear end inserted in the spool is enlarged by a mechanical lever and detected by a photo sensor.

[0009]

In the device for detecting the rear end of the film on the spool, the position of the rear end of the film in the film feeding direction is detected to indirectly detect the lock of the film. There is. Therefore, even if sufficient locking force is not obtained or is not locked due to deformation of the rear end of the film, damage to the film locking hole, deformation of the spool locking claws, etc., the sensor completes locking. Therefore, it may be wound around the spool in a state where the necessary locking force cannot be obtained.

Further, in the method of inserting the film into the spool in the cartridge assembled as described above and winding the film, it is difficult to dispose a sensor or the like for detecting the rear end of the film in the spool, It is not possible to use a film locking detection device including such a film trailing edge detection sensor.

The present invention has been made to solve the above problems, and provides a device for detecting the locking of a photographic film on a spool, which can reliably detect the locking of the rear end of the film on the spool. The purpose is to

[0012]

In order to achieve the above object, the present invention provides a means for detecting that the rear end of a photographic film has been sent to a locking portion of a spool, and, after detecting this sending,
Means of pulling the photo film in the direction opposite to the feeding direction with a force smaller than the locking strength between the rear end of the photo film and the locking part, and the locking of the photo film on the spool when the film returns due to this pulling And a means for detecting.

According to a second aspect of the present invention, there is provided a device for detecting locking of a photographic film on a spool. A motor for rotating a film feeding part for feeding the rear end of the photographic film to the locking part of the spool and rotating the film feeding part forward and backward. Is provided between the motor and the film feed part, and when the film is rotated in the film return direction opposite to the film feed direction of the motor, a torque smaller than the locking strength between the locking part of the spool and the rear end part of the film is fed. A sensor that is installed between the film transmission section and the film feed section and the spool to detect the presence / absence of the film, and the film feed time or the film feed amount is detected based on the film presence signal of this sensor to detect the film rear end. It is detected that the part has been sent to the position where it is locked by the locking part of the spool, and after this detection, the motor is rotated in the film return direction and In which the film presence sensor and a controller for detecting the locking failure of the film spool when issued the film absence signal.

[0014]

After the rear end portion of the photographic film is fed to the locking portion of the spool, the photographic film is moved in the direction opposite to the feeding direction with a force smaller than the locking strength between the rear end portion of the photographic film and the locking portion. Be pulled. When the film returns due to the pulling of the film, a defective lock of the photo film on the spool is detected. In this way, the film is pulled by the practically necessary locking force and the locking is confirmed, so that the locking of the film is reliably detected, and it is also detected whether or not it has the practically necessary locking force. To be done.

FIG. 2 shows an example of the cartridge body. The cartridge main body 10 is composed of an upper case 7 and a lower case 8 which are integrally molded of resin, and a spool 12. A pair of ribs 15 are formed on the inner walls of the upper and lower cases 7 and 8, and when the spool 12 in which the photographic film is wound in a roll is housed in the upper and lower cases 7 and 8,
The rib 15 is in contact with the outermost periphery of the photo film and is the spool 12.
Prevents loosening from winding. Therefore, when the spool 12 is rotated in the film feeding direction (clockwise in the figure), the photographic film roll also rotates in the same direction as the spool 12. Reference numeral 17 indicates a tip separating claw, and when the film roll is rotated together with the spool 12, the tip separating claw 17 scoops the tip of the photographic film.

The upper and lower cases 7 and 8 have port portions 7a and 8a.
Is provided, and when the upper and lower cases 7 and 8 are combined and integrally connected, a film passage 19 is formed at the joint of the port portions 7a and 8a. A lid member 14 is incorporated between the port portions 7a and 8a. Rotational support portions 14a are provided at both ends of the lid member 14, and the lid member 14 is rotatable about an axis parallel to the rotation axis of the spool 12. A key groove 16 is further provided at one end of the rotation support portion 14a and is exposed on the side surface of the cartridge body 10. By fitting the lid opening member 18 into the key groove 16 from the outside and rotating it, the lid member 14 can be rotated between the position where the film passage 19 is opened and the position where the film passage 19 is closed.

The spool 12 is integrally provided with a pair of flanges 12a, and the photographic film has these flanges 12a.
It is wound around the shaft portion 12b between a. Both ends of the spool 12 are exposed to the side surface of the cartridge main body 10, and a key 13 is provided on the exposed portion. As is well known, the key 13 is used to engage a member for driving the spool when the spool 12 is rotated. As shown in the figure, a cutout 13a is provided at one end of the key 13.

A slit 2 is formed on the shaft portion 12b of the spool 12.
0 is formed. Inside the slit 20, as shown in FIGS. 3 and 4, a pair of claws 21 and a pressing rib 22 are provided.
And are provided. The tip of the pressing rib 22 is the claw 2
It protrudes so that it may be located in the height range of the claw 21 between 1 and 1. The right side of the slit 20 in FIG. 3 is the insertion opening side, and the rear end portion 24 of the photographic film 24 extends from this insertion opening.
a is inserted.

As shown in FIG. 5, a pair of locking holes 25 are formed in the rear end portion 24a of the photographic film 24, and the claws 21 enter into the locking holes 25 and lock. The pressing rib 22 presses the rear end of the photographic film 24 so that it does not float up. Therefore, the engagement between the claw 21 and the locking hole 25 is maintained, and even if force is applied in the direction of pulling out the photographic film from the slit 20, it can be removed. There is no. A pair of holes 26 are formed on the rear end portion 24a of the photographic film 24 outside the locking holes 25, and the holes 26 are formed in the slit 20 at the rear end portion 24a of the photographic film 24.
Used when inserting into.

[0020]

EXAMPLE FIG. 6 and FIG. 7 show a slit 20 of the spool 12.
The rear side of the photographic film is inserted and locked, and the device 29 for winding the photographic film 24 on the spool 12 is shown in broken side view and external appearance. The spool 12 is incorporated in advance in the cartridge body 10 including the upper and lower cases 7 and 8 together with the lid member 14. A receiving portion 31 corresponding to the outer shape of the cartridge body 10 is formed in the base block 30, and receives the cartridge body 10 as shown in FIG. A pressing arm 32 driven by, for example, a hydraulic cylinder device or a link mechanism (both not shown) is attached to the base block 30. When the cartridge body 10 is supplied to the receiving portion 31, the cartridge body 10 is pressed. .

The patrone body 1 is held by the pressing arm 32.
When 0 is pressed down, the cartridge body 10 is held in a fixed posture by the shape of the receiving portion 31 and the port receiving portion 33, and the entrance of the film passage 19 is also fixed in a fixed position. As shown in FIG. 7, a pair of rotating arms 35 are pivotally attached to both side surfaces of the base block 30 by shafts 35 a, and are rotated by driving a stepping motor 36. The arms 35 are connected by a mounting plate 37, and a claw plate 39 is fixed to the mounting plate 37. The claw plate 39 is formed of a flexible metal thin plate that is curved in an arc shape, and has a pair of arms protruding in the shape of an arm, and claws 39a are provided at the tips of the arms.

A slide frame 40 is incorporated on one side surface of the base block 30 so as to be movable between a position close to the side surface of the cartridge main body 10 and a position apart from the side surface. The slide frame 40 includes a fork member 41a that engages with the key 13 of the spool 12, a motor that drives the fork member 41a, a lid opening member 18 that engages with the key groove 16 of the lid member 14, and a drive unit that drives the motor. Holds 41. This slide frame 40
Is in the retracted position until the cartridge body 10 is set in the receiving portion 31, and moves to the drive position after the cartridge body 10 is set in the predetermined position. As a result, the spool driving fork member 41a and the lid opening / closing member 18 incorporated in the drive unit 41 are exposed on the side surface of the cartridge main body 10, respectively.
And the key groove 16 of the lid member 14.

A photo sensor 42 is incorporated on the other side surface of the base block 30. This photo sensor 4
2 is a notch 13a provided in the key 13 of the spool 12
The position is detected and whether the spool 12 is in a constant rotational position is identified. Therefore, the same key 13 and notch 13a are formed on the other end side of the spool 12.
Is provided.

As shown in FIG. 6, a film guide 45 is provided so as to face the base block 30.
The film guide 45 is connected to the feeding device of the photographic film 24, and after the photographic film 24 is wound around the main body 10 of the film, the rear end portion 24a of the photographic film 24 is stopped at a fixed position again. Therefore, when the rear end portion 24a of the photographic film 24 is projected from the film guide 45, the relative position between the hole 26 and the claw 39a is always constant.

FIG. 8 shows a receiving portion 31 of the cartridge body 10.
Also, the positional relationship between the cartridge body 10 and the arm 35 when the port receiver 33 is positioned in a fixed posture is shown. The shaft 35a is set substantially equidistant from the center of the shaft 12a of the spool, the film passage 19, and the claw 39a when the arm 35 is at the standby position. Therefore, when the arm 35 is rotated counterclockwise from the standby position shown in FIG. 8, the pawl 39a passes through the film passage 19 and enters the slit 20 formed in the shaft portion 12a of the spool as shown in FIG. It will come in. The notch 13a described above is used to set the spool 12 to the rotational position shown in FIG.

As shown in FIG. 6, in front of the film guide 45, there is provided a pair of feed rollers 50 for feeding the rear end portion 24a of the photographic film 24 fed from the guide 45 to the spool side. The feed roller pair 50 is linked to a motor 52 via a hysteresis clutch 51. The motor 52 is connected to the controller 5 via the driver 53.
The forward / reverse rotation is controlled by 4. Further, as is well known, the hysteresis clutch 51 can be set so that the transmission torque at the time of forward rotation differs from that at the time of reverse rotation, and in this embodiment, at the time of reverse rotation, it becomes half of the transmission torque at the time of forward rotation. It is set.

The feed roller pair 50 and the film winding device 2
A film sensor 60 for detecting the presence / absence of the photographic film 24 is arranged between the photo sensor 9 and the photo sensor 9. The film sensor 60 is composed of a light emitting and receiving photo sensor,
It turns on when the film 24 blocks the optical path, and detects the presence of the film. An infrared type photosensor is used so as not to expose the film.

The controller 54 is composed of a microcomputer, and controls each part in sequence based on the film presence / absence detection signal of the film sensor 60 to detect whether or not the photographic film 24 is securely locked to the spool 12. Specifically, the lock detection of the spool 12 of the film rear end portion 24 is performed based on the flowchart shown in FIG.

The operation of this embodiment will be described below with reference to FIG. The empty cartridge body 10 is set in the film winding device 29, the lid member 14 and the spool 12 are rotated to predetermined positions, and the film insertion standby state is set. After that, the film guide 45 and the film feed roller pair 50 send the film rear end portion 24a to the cartridge main body 10 side, and when the film sensor 60 detects the presence of the film, the film feed is stopped. In this state, the claw plate 39 of the film winding device 29 rotates to feed the film rear end portion 24a into the slit 20 of the spool 12 in the cartridge body 10 as shown in FIG. After the film sensor 60 detects the presence of the film, the controller 54 counts clock pulses by the timer 61 in the controller 54, and determines the time Ta until the film rear end portion 24a is locked by the claw 21 in the slit 20 of the spool 12. measure. When the count value Tc exceeds this time Ta, the controller 54 resets the timer 61 to newly start counting, and the motor 52
Reverse. As a result, the drive of the motor 52 is transmitted to the feed roller pair 50 via the hysteresis clutch 51,
The film 24 is pulled so as to be pulled back. This pulling force is generated by the hysteresis clutch 51 by the claw 2
Since the locking force is adjusted to a practically required locking force that is smaller than the locking force between 1 and the locking hole 25, the locking hole 25 is not damaged by the claw 21 and whether the film 24 is locked or not. Is detected, and it is also detected that the necessary locking force is provided.

After this pulling, the timer count value T
When the film sensor 60 detects that there is no film after c has passed the predetermined time Tb, it is detected that the film 24 is disengaged from the spool 12 due to a defective locking, and the operator is warned of the defective locking by an alarm. . The predetermined time Tb is set to be longer than the time required for the trailing edge of the film to pass through the film sensor when the film is returned by pulling. Further, when the film sensor 60 detects the presence of the film even after the lapse of the predetermined time Tb, it is detected that the locking is surely performed, and in this case, the film winding which is the next step is performed. The take-up is performed by rotating the spool 12 in the take-up direction.

In the above embodiment, the clock pulse is counted by the timer to detect the locking completion time of the film and the film return completion time after pulling from the elapsed time. The completion time of these may be detected by detecting the amount or the film return amount. Further, the clock pulse counting start time by the timer may be any one as long as it can detect the film locking completion time and the film return completion time after pulling, and is not limited to the above embodiment.

Further, in the above embodiment, the present invention was carried out on the spool 12 of the cartridge main body 10 having the film feeding function, but in addition to this, the most popular 1
The present invention may be practiced when the photographic film is wound around the spool of a 35-type photographic film cartridge. Also in this case, a film sensor is provided between the film feed roller pair and the spool, and the film feed roller pair is normally and reversely rotated through the hysteresis clutch, and when the motor is rotated in the reverse direction, the torque is reduced to about half of that in the normal rotation and the film is returned. When the film sensor detects the absence of a film by this pulling, a defective engagement between the spool and the film is detected.

In the above embodiment, the film guide 4 is used.
Although the film feed roller pair 50 is provided separately from 5, and the film 24 is pulled by this, the film may be pulled by the film feed roller pair of the film guide.

[0034]

As described above, according to the present invention, it is detected that the rear end of the photographic film has been fed to the engaging portion of the spool, and after the feeding is detected, the photographic film is fed in the feeding direction. Pulling in the opposite direction, and when the film returns due to this pulling, a defective lock of the photo film on the spool is detected, so it is possible to automatically detect whether or not the film is securely locked on the spool. . Moreover, since the photographic film is pulled with a force that is smaller than the locking strength between the rear end of the photographic film and the locking portion and the practical locking strength required for winding the film, the rear end of the film is locked. Even when sufficient locking strength cannot be obtained due to damage to the hole, damage to the locking claw of the spool, or the like, this can be reliably detected.

Further, since a clutch for transmitting a torque equal to or less than the locking strength between the locking portion of the spool and the rear end portion of the film when the motor is rotated in the film returning direction is provided, and the film is pulled by this, the film rear end portion is provided. If the locking portion of the spool and the locking portion of the spool are not sufficiently locked, and thus the locking strength sufficient for practical use cannot be obtained, this can be reliably detected.

Further, the film sensor provided between the film feeding section and the spool detects the trailing edge of the film, and the film feeding time or the film feeding amount is detected on the basis of the signal for detecting the trailing edge of the film to detect the film feeding time. It is detected that the rear end has been sent to the position where it is locked by the locking part of the spool, and after this detection, the motor is rotated in the reverse direction, and when the film presence sensor issues a no film signal within a certain period of time, the film Since a controller is provided to detect the locking failure on the spool, if the rear end of the film is in the slit of the spool, sufficient locking strength will be obtained due to missing locking holes or damage to the locking claws. Even when it is not obtained, it can be automatically and reliably locked.

[Brief description of drawings]

FIG. 1 is a flow chart showing a processing procedure of a lock detection device for a spool of a photographic film according to the present invention.

FIG. 2 is an exploded perspective view of a cartridge body.

FIG. 3 is a sectional view of a spool incorporated in the cartridge main body.

FIG. 4 is a front view of the spool.

5 is a perspective view showing an example of the rear end shape of the photographic film accommodated in the cartridge body of FIG.

FIG. 6 is a partially cutaway side view of the photographic film winding device.

FIG. 7 is a perspective view of the winding device.

FIG. 8 is a partially cutaway side view for explaining the operation until the rear end of the photographic film is locked to the spool.

FIG. 9 is a perspective view showing a state in which the rear end of the photographic film is locked to the spool.

[Explanation of symbols]

 10 Patrone body 12 Spool 14 Lid member 19 Film passage 20 Slit 21 Locking claw 22 Holding rib 24 Photo film 24a Rear end 25 Locking hole 26 Hole 29 Film winding device 35 Arm 39 Claw plate 39a Claw 50 Film feed roller pair 51 Hysteresis Clutch 54 Controller 60 Film Sensor

Claims (2)

[Claims] 1. A device for winding a photo film on a spool by locking a rear end of the photo film to a locking part of the spool, and engaging a rear end of the photo film to the locking part of the spool. In the device for detecting the stop, a means for detecting that the rear end of the photographic film has been sent to the locking portion of the spool, and the locking strength between the rear end of the photographic film and the locking portion after detecting this feeding. A photographic film having means for pulling the photographic film in a direction opposite to the feeding direction with a force smaller than that, and means for detecting an improper locking of the photographic film to the spool when the film is returned by this pulling. Lock detection device for spool. 2. A rear end portion of the photographic film attached to a device for winding the photographic film on the spool by locking the rear end portion of the photographic film to the engaging portion of the spool. In the device for detecting the stoppage, a film feeding section that feeds the rear end of the photo film to the locking section of the spool, a motor that rotates the film feeding section forward and backward, and a motor provided between the motor and the film feeding section, Between the film feed part and the spool, the clutch that transmits a torque smaller than the locking strength between the locking part of the spool and the rear end of the film to the film feed part when the motor rotates in the film return direction opposite to the film feed direction. Sensor for detecting the presence / absence of the film, and the film feed time or the film feed amount is detected based on the film presence signal of this sensor to detect the film rear end. It is detected that the film has been sent to the position where it will be locked by the locking part of the film, and after this detection, the motor is rotated in the film return direction, and when the film presence sensor issues a no film signal within a certain time. And a controller for detecting a locking failure of the spool on the spool of the photographic film.