JPS6010298B2 - Operating device for electric film feed camera using non-porous roll film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a roll film that is non-perforated, that is, has no perforations, and is used in a camera that advances the film one frame at a time electrically, especially an X-ray indirect photography camera, etc. It is related to the device.

Generally, when unwinding a non-perforated roll film wound around a film line drawing spool, if the film has already cracked when the spool is loaded, if the film is cut during feeding, even though the film has not been fed yet. However, there is a problem in that the camera is photographed without being photographed. If such a cutting of the film is detected by contacting the film at the position of the film line drawing spool, there is a drawback that the load during driving becomes large and the film is easily damaged.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device that can easily detect film cutting without contacting the film at the position of the film feeding spool.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In Fig. 1, 1 is the film line feed spool, 2 is the film, 3 is the screen aperture in the camera, 4 is the film drive roller that contacts the film and sends it in the direction of the arrow, 5 is the axis of the roller 4, and 6 is the film. the roller 4
Auxiliary lohu that presses against, 7 is warm 8 warm theory 9
A motor that rotates the roller 4 via a shaft 5 etc., 1
0' A cam fixed to the shaft 5, 11 is a switch controlled by the cam 101, and the cam 10 switches the switch 11 every time the film drive roller 4 finishes feeding one frame of film.
The motor 7 is first activated through a separate operating circuit, and when the cam 10 activates the switch 11 after the film has been advanced by one frame, the motor 7 is rotated by the switch. shall be made to stop.

Note that the motor 7 may drive the take-up spool shaft and the drive roller 4 may be used as a driven roller. 12 is a square key 13
15 is a disc fixed to the shaft 12; 15 is a disc fixed to the shaft 12;
6 is a large number of small holes bored in a circular arrangement in the disk 15; 17 is a light source provided for the small hole 16; 18 is a photoelectric element provided to receive light from the light source 17 through the small hole 16; The rotation of the disk 15 interrupts the light beam from the light source 17 to the photoelectric element 18 to generate electrical pulses.

In the above camera, when the motor 7 is operated to feed the film, the line feed spool also rotates as the film is fed, but the rotation angle for one piece of film differs depending on whether there is a large amount of film or a small amount of film. Very different.

Therefore, the number of small holes 16 for each frame of film that are on the disc 15 that rotates together with the spool and that generate pulses for the photoelectric element 18 varies, but in the present invention, the number of small holes 16 for each frame of film varies. Emphasis will be placed on the number of pulses corresponding to the maximum rotation angle of 4.
This is detected by a pulse counting circuit and related circuits connected to the photoelectric element 18, and when a predetermined number is reached, the subsequent exposure (
(including X-ray exposure). An example of such an operating circuit will be described with reference to FIG. 7. The pulse signal generated by the photoelectric element 18' first enters a waveform shaping circuit 19 and is shaped into a uniform waveform that is used to operate subsequent circuits. Then, it enters a pulse count circuit 21 through a gate circuit 20 that is open only while the film drive motor 7 is operating. Although the gate circuit 20 is not essential, it generates a pulse when the film feeding spool 1 is reversely rotated when the motor 7 is stopped in order to strengthen the winding of the roll film wound on the film feeding spool 1 during film loading. In extreme cases, this is to prevent exposure from being allowed even though the film is not fed out.

A comparison circuit 23 connected to a reference setting circuit 22 for setting the minimum number of pulses corresponding to one frame of film is provided following the pulse count circuit 21, and the reference pulse and the number of output pulses from the pulse count circuit 21 are When the number of pulses is equal to or greater than the reference pulse number, an OK signal is issued to permit exposure operation in the camera, and in this state, when an operation command is given to the photographing device, exposure is performed in the camera. Then, the film winding mechanism including the motor 7 is activated to wind the next film, but the reset circuit 25 is activated by another signal from the photographing device (which performs exposure after the line for one frame is drawn). Clear the counted value. Note that if the above imaging device is replaced with an X-ray controller and an X-ray exposure unit, and the imaging command is replaced with an X-ray exposure command, the present invention can be applied to indirect X-ray imaging.

Note that during the above operation, the timing at which the pulse count circuit 21 finishes counting the predetermined number of pulses and the OK signal is issued may be when one frame's worth of film feeding has not yet been completed, depending on the amount of film remaining in the spool 1. Therefore, a device is added that prevents the photographing command from being sent while the motor 7 is in operation.

In other words, exposure is possible only when the film is exposed by one line. In the above description, a large number of small holes 1 are provided in the disk 15 to generate electric pulses as the spool rotates.
6, a light source 17, and a photoelectric element 18, but instead, a disk 1 on a rattan 12 as shown in FIG.
A gear-shaped uneven cam portion 26 may be provided on the cam portion 5, and a microswitch 27 may be provided in contact with the cam portion 27 and opened/closed by the rotation of the cam portion 26 to obtain pulses, and the light reflected from the cam portion 26 may be utilized. A light source 17 and a photoelectric element 18 may be provided to obtain pulses by the difference in reflection between the convex portion and the concave portion.

The latter method can be similarly carried out by providing cotton-like portions 28 having different reflectances, such as black and white, on the circumferential surface of the disk 15, as shown in FIG. Also, instead of using the support shaft of the spool, the spool itself is used directly, so that even when the entire amount of film is wound, an excess portion remains at the flange, as shown in Figures 4 to 6. A large number of small holes 16, uneven cam parts 26, or cotton-like parts 28 with different reflectances are provided in that part, and a light source, a photoelectric element, or a microswitch is combined with these as shown in Figs. 1 to 3. It can also be operated in the same way. As described above, according to the present invention, the pulse generating means is provided coaxially with the film line drawing spool, and the pulse generated in response to the rotation angle of the film line drawing spool when drawing the film line is equal to or greater than a reference value. It is possible to easily detect film cutting without contacting the film at the position of the film line feed spool by detecting whether or not the film is being cut. It can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main part configuration of one example of a camera implementing the device of the present invention, and FIGS. 2 and 3 are perspective views showing other examples of the pulse generator portion, respectively. FIG. 6 is a perspective view showing the shape of the film spool when the film spool itself is used for pulse generation, and FIG. 7 is a block diagram showing the relationship between the operating circuit and partial devices in the apparatus of the present invention. 1: Film line drawing subur, 2: Film, 4: Film drive low-fu, 5: Roller shaft, 7: Motor, 1
0: Force arm, 11: Switch, 12: Spray support shaft, 1
5: Disk, 16: 4 holes, 17 Three light sources, 18: Photoelectric element, 19: Waveform shaping circuit, 20: Gate circuit, 21: Pulse count circuit, 22: Standard setting circuit, 23: Comparison circuit, 25: Reset circuit, 26: uneven cam, 27: micro switch, 28: striped portion. Juice style is Z diagram next group 3 ga 4M Guzu■ Guyo'9 younger brother 7 diagram

Claims (1)

[Claims] 1. Pulse generating means for generating a number of pulses corresponding to the rotation angle of the film feeding spool when feeding the non-porous roll film, which is provided coaxially with the film feeding spool on which the non-porous roll film is wound; and the non-porous roll film. a drive source for driving the non-porous roll film, a roller that rolls into contact with the non-porous roll film, and a cam that interlocks with the roller;
a switch that engages with the cam and limits the drive of the drive source corresponding to one frame of non-perforated roll film; a counting circuit that counts the pulses; and a comparison circuit that uses the output of the counting circuit as one input. , a reference value setting circuit connected to the other input of the comparison circuit and set with a pulse reference value corresponding to the minimum rotation angle of the film payout spool when the film is fed out by one frame; and the drive source is stopped by the switch. means for resetting the count value of the counting circuit by exposure in a state in which the camera is exposed, and allowing the next exposure operation in the camera by the output of the comparison circuit when the count value of the counting circuit exceeds the reference value. An actuating device for an electric film feed camera using non-porous roll film, characterized in that the actuating device is provided with a means.