JP3211552B2 - Film feeding and winding control 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 feeding and winding control device useful for printing a film in a cartridge on a photographic printer.

[0002]

2. Description of the Related Art Conventionally, when a film in a cartridge is subjected to photographic printing, the leading end of the film is housed in a cartridge, and the spool is rotated in a feeding direction opposite to the film winding direction to perform scanning and printing operations. Later, a device for rewinding the film in the cartridge again has been proposed.

[0003]

However, in the conventional apparatus, when the film is taken in and out of the cartridge, the film tip is locked at the film entrance or exit due to the shape of the film tip or the spool is forcibly fed. If the film is rotated in the winding direction and the winding direction, the film may be bent or cut in the cartridge.

[0004] The present invention has been developed to solve the above-mentioned problems.
It is an object of the present invention to provide a film feeding / winding control device capable of preventing film clogging and film cutting inside and outside a cartridge.

[0005]

Accordingly, the present invention has the following configuration in order to achieve the above object. That is, the film feed from the cartridge or a
In the device that winds up the cartridge , the film is loaded.
A spool rotating shaft for engaging the spool in the cartridge to be attached and rotating the spool, and a motor rotating shaft for transmitting drive to the spool rotating shaft via an elastic connector such as a torsion coil spring. A motor for rotating the motor rotating shaft in a forward or reverse direction, a pair of polarizing plates rotating while changing the transmittance in accordance with a rotation torque error between the spool rotating shaft and the motor rotating shaft, and a polarizing plate; A detector for detecting the fluctuation of the transmittance of the motor, and controlling the rotation torque of the motor based on the detection of the detector, and a predetermined allowable range of the transmittance.
And a controller for stopping the rotation of the motor when exceeding the surroundings .

[0006]

With the above construction, if the spool rotation shaft and the motor rotation shaft rotate with the same torque, the polarizing plates provided on the respective rotation shafts also rotate while maintaining the same transmittance.
When the rotation of the spool rotation shaft becomes slow due to clogging of the film in the cartridge or the like, blur occurs in the characteristic direction of both polarizing plates, the transmittance decreases, and a change in the transmittance is detected by a detector. The change in the transmittance detected by this detector is determined by the controller, and the motor torque is shifted in several stages. If the transmittance exceeds a preset allowable range, the rotation of the motor is immediately stopped to avoid the danger of cutting the film.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a film feeding / winding control device according to an embodiment of the present invention, which is a device for feeding or winding a film A from a cartridge 2. The feed / rewind control device 1 includes a spool rotation shaft 4 that engages with the spool 3 mounted on the film A in the cartridge 2 to rotate the spool 3.
A motor rotating shaft 6 for transmitting a drive to the spool rotating shaft 4 via an elastic connecting member 5 such as a torsion coil spring, a motor 7 for rotating the motor rotating shaft 6 forward and reverse, and a spool rotating shaft A pair of polarizing plates 8 and 9 provided so as to face the motor 4 and the motor rotating shaft 6 via the elastic connecting member 5, and a detector for detecting a change in transmittance of the polarizing plates 8 and 9. LED sensor (light emission) 10 and photodiode (light reception) 11
A controller 12 for controlling the rotational torque of the motor 7 based on the detection of the detector;
2 and a CPU 13 and an amplifier 14 connected to an LED sensor (light emission) 10 and a photodiode (light reception) 11.

Each of the polarizing plates 8 and 9 is provided with a spool rotating shaft 4.
And supporting discs 15 and 16 provided on the motor rotating shaft 6,
Each is fixed by a screw 17. The polarizing plates 8 and 9 are used to control the S
The wave plate blocks either the wave or the P wave. In the state of the polarizing plate 8 (9) in FIG. 2, the S wave is cut off, and the polarized light is rotated by 90 degrees from the state of the polarizing plate 8 (9) in FIG. In the state of the plate 8 (9), the P wave is blocked. In the state of the polarizing plates 8 and 9 as shown in FIG. 4, only the S wave is blocked. Both polarizing plates 8 and 9 are usually mounted in the same characteristic direction to block only this S wave. In the state of the polarizing plates 8 and 9 in FIG.
Break the waves. This state occurs when a load is applied to the spool rotation shaft 4 and the polarizing plate 8 or the polarizing plate 9 is rotated.

The LED sensor (light emission) 10 and the photodiode (light reception) 11 are arranged at positions facing each other via the polarizing plates 8 and 9. That is, the LED sensor (light emission) 10 is attached to a support bracket 18 disposed near the motor 7, and the flat portion 8 a of the polarizing plate 8 is provided.
And at a predetermined interval. Further, the photodiode (light receiving) 11 is attached to a support bracket 19 disposed near the cartridge 2, and a flat portion 9 of the polarizing plate 9 is provided.
a with a predetermined interval. The LED sensor (light emission) 10 and the photodiode (light reception) 11 face each other via both polarizing plates 8 and 9 and detect a change in transmittance of the polarizing plates 8 and 9.

In the film feeding / winding control device 1 having the above-described configuration, the spool rotating shaft 4
When the motor and the motor rotation shaft 6 rotate with the same torque, the polarizing plates 8 and 9 also rotate while maintaining the same transmittance. (This is a normal state without film clogging or the like.) If the rotation of the spool rotating shaft 4 becomes slow due to film clogging in the cartridge or the like, the characteristic directions of the polarizing plates 8 and 9 are blurred, The transmittance decreases, and the LED sensor 10 and the photodiode 11 detect a decrease in the transmittance.

The change in the transmittance detected by the LED sensor 10 and the photodiode 11 is determined by the controller 1.
2. The motor torque is changed in several stages as determined by the CPU 13. When the transmittance exceeds a preset allowable range, the rotation of the motor 7 is immediately stopped to prevent the film A from being cut or the like.

As shown in FIG. 6, instead of the polarizing plates 8 and 9, a disk-shaped plate 20 is attached to the motor rotation shaft 6 and a disk-shaped plate 21 is mounted so as to face the spool rotation shaft 4. Further, an LED sensor 22 is attached to the outer end of the disc-shaped plate member 20 on the motor rotation shaft 6 side, and a photodiode 23 is provided at a predetermined interval around the entire outer end of the disc-shaped plate member 21 on the spool rotation shaft 4 side. When the disk-shaped plate members 20 and 21 are displaced due to a change in the rotational torque, it is determined which photodiode 23 of the disk-shaped plate member 21 on the spool rotation shaft 4 side is detected, and the motor is determined. 7 may be controlled.

[0013]

As described above, according to the present invention, it is possible to feed the film.
The take-up control device can prevent film breakage inside and outside the cartridge by detecting the rotation abnormality of the spool stepwise, and stop the rotation of the motor when a torque exceeding a certain level is applied to the spool to stop film rotation, etc. Trouble can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a film feeding and winding control device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a state of a polarizing plate that blocks an S wave.

FIG. 3 is an explanatory diagram illustrating a state of a polarizing plate that blocks a P-wave.

FIG. 4 is a state explanatory view of a polarizing plate showing a state in which only an S wave is blocked.

FIG. 5 is a state explanatory view of a polarizing plate showing a state in which an S wave and a P wave are blocked.

FIG. 6 is an explanatory view showing another embodiment in which an LED sensor and a photodiode are provided on disk-shaped plate members facing each other at a predetermined interval.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 film feeding / rewinding control device A film 2 cartridge 3 spool 4 spool rotating shaft 5 resilient coupling tool such as torsion coil spring 6 motor rotating shaft 7 motor 8, 9 polarizing plate 10 LED sensor (light emitting) 11 photodiode ( Light receiving) 12 controllers

Claims (1)

(57) [Claims] 1. A film feed from the cartridge or wound into the cartridge device, Fi
The drive is transmitted to the spool rotation shaft via a spool rotation shaft that is engaged with a spool in a cartridge in which the lum is mounted and rotates the spool, and an elastic coupling tool such as a torsion coil spring. A rotation axis of the motor, a motor for rotating the rotation axis of the motor forward and reverse, and a pair of polarized light rotating while changing the transmittance in accordance with a rotation torque error between the spool rotation axis and the motor rotation axis. Plate, a detector for detecting a change in transmittance of the polarizing plate, and controlling the rotation torque of the motor based on the detection of the detector and the transmittance set in advance.
If the allowable range is exceeded, stop the rotation of the above motor.
And a controller for feeding and winding the film.