JPS6157254B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is suitable for use in a film take-out device, particularly in a sheet film type X-ray copying device.

Sheet film type X-ray speed photography equipment uses a suction cup to take out the films one by one from a box containing unexposed film, transports them via transport rollers to a close-contact frame containing an intensifying screen, and then The film is kept on standby until a photographing signal is applied by utilizing the close contact between the film and the photographing signal and the division selection signal. The film is then stored in the finished film storage box.

Next, the operating mechanism of the suction cup in the device is
This will be explained with reference to the figures. In the figure, 1 is a box containing a plurality of unphotographed films 2, 3 is a suction cup, and a pipe 3a is connected to this suction cup 3. 4 is branched and connected to the pipe 3a,
This is a vacuum switch for detecting the pressure inside a pipe 3a, and as shown in FIG. 2, this vacuum switch 4 includes a cylinder 4a communicating with the pipe 3a, and a piston rod 4b that moves up and down within the cylinder 4a.
, a tension spring 4c that urges the piston rod 4b upward, a contact 4d that comes into contact with the piston rod 4b as it moves downward, and a lead wire _l1 connected to the contact 4d. pipe 3
When the pressure inside a (that is, the contact pressure between the suction cup and the film) reaches -100 mmHg, for example, the piston rod 4b moves downward against the spring pressure, and the contact point 4d comes into contact with the piston rod 4b. Reference numeral 5 designates a switching solenoid valve, which is configured to be turned on during suction operation and turned off when not in operation. 6 is a vacuum pump for evacuating the inside of the pipe 3a. According to such a suction mechanism, the inside of the pipe 3a is evacuated by turning on the switching solenoid valve 5 while the suction cup 3 is brought into close contact with the unphotographed film 2 via a vertical movement mechanism (not shown). Vacuum pressure (contact pressure) is -
When the pressure reaches 100 mmHg, operate the vacuum switch 4, and based on the operation of the vacuum switch 4, reverse the vertical movement mechanism drive motor (not shown) to simultaneously move the suction cup 3 and the film suctioned thereto upward. I can do it.

However, since the vacuum switch 4 that uses a tension spring as an operating medium as described above is used, it is difficult to adjust the spring pressure and there are variations in the spring pressure. Detection accuracy will deteriorate. Therefore, there have been problems in that the contact pressure changes, resulting in failure to adsorb the film, or the contact pressure is too strong, leaving adsorption marks on the film. Furthermore, due to poor vacuum pressure detection accuracy, even after the suction cup 3 is brought into contact with the film 2, the vertical movement motor continues to rotate in the normal direction, pressing the film more forcefully than necessary and leaving traces of the suction cup. There was also the problem that the

The present invention has been made in view of the above circumstances, and provides a film take-out device that improves the detection accuracy of contact pressure, does not leave any suction marks on the film, and is equipped with a suction mechanism that prevents mistakes in suction of the film. The purpose is to provide

The present invention will be specifically explained below using Examples.

FIG. 3 is a schematic diagram showing an embodiment of the apparatus of the present invention. In the figure, 1 is a box containing unphotographed film 2, 3a is a pipe, 5 is a switching solenoid valve, and 6
is a vacuum pump and has the same structure and function as each member of the conventional device. Reference numeral 7 denotes a suction cup, which, unlike conventional suction cups, is constructed with a pressure-sensitive resistor as the main part. That is, as shown in FIG. 4, this suction cup 7 includes a pressure-sensitive resistor 7a (made of rubber, for example) having a cup shape as a whole;
It is composed of two electrodes 7b and a through hole 7c for adsorption, which are stacked at a predetermined interval near the tip, and each electrode 7b is connected to a lead wire.
It is connected to a motor reversing switch in the motor control circuit 8 via _l2 . Here, this pressure-sensitive resistor 7a has a characteristic that the resistance value changes depending on the degree of contact pressure when the film comes into contact with the tip. For example, the resistance value decreases as the contact pressure increases. It's summery. Therefore, for example, when the contact pressure becomes -100mmHg, the resistance value becomes minimum and becomes 2.
It is sufficient that the structure is such that an energized state is obtained between the two electrodes 7b, and that the motor reversing switch of the motor control circuit 8 is made conductive during this energized state. In FIG. 3, reference numeral 9 denotes a vertical movement mechanism as a mechanism for moving the suction cup 7 forward and backward, and includes a motor 10 that can rotate forward and backward, a pinion 11 fixed to the rotating shaft of the motor 10, and a mechanism that meshes with the pinion 11. The rack 12 is configured by a rack 12 that moves up and down.
A connecting rod 13 is fixed to the connecting rod 2, and the base end of the suction cup 7 is fixed to the tip of the connecting rod 13. The rack 12 is configured to move up and down when the motor 10 rotates in the normal direction, and to move upward when the motor 10 rotates in the reverse direction. Such a motor 10 is controlled by a signal from the motor control circuit 8. It is becoming more and more like this.

Next, the operation of the component device will be explained. First, the tip of the suction cup 7 contacts the film 2, and as the contact pressure increases, the internal resistance of the pressure-sensitive resistor 7a decreases, and when the contact pressure eventually reaches the desired pressure (-100 mmHg), electricity is applied via the electrode 7b. Since the state is obtained, the motor reversing switch in the motor control circuit 8 operates, and the motor 10 in the vertical movement mechanism 9 immediately operates in reverse. Therefore, the suction cup 7 and the film suctioned thereon are moved upward. In this case, the operation of the pressure sensitive resistor 7a is based on the two electrodes 7b.
It can be easily set by appropriately selecting the interval between and the volume of the material, and once it is set, it does not change, so the detection accuracy of the contact pressure is greatly improved.

According to the device of the embodiment described in detail above, since a pressure-sensitive resistor is used to detect contact pressure, it is possible to prevent variations in contact pressure detection due to variations in spring pressure as in the conventional case. Accuracy can be improved. Therefore, it is possible to prevent adhesion of adsorption marks caused by adsorption errors or increase in contact pressure. In addition, the detection accuracy of contact pressure has been improved, and the vertical movement mechanism can be operated immediately when a predetermined pressure is reached, so it is possible to prevent the adhesion of suction marks due to the pressing of the suction cup due to continued forward rotation of the motor. can. In this way, it is possible to provide a film take-out device equipped with an optimal suction mechanism.

The present invention is not limited to the embodiments described above, and modifications can be made without changing the gist thereof.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a suction mechanism in a conventional X-ray copying device, Fig. 2 is a sectional view showing an example of the structure of a vacuum switch used therein, and Fig. 3 is an example of an adsorption mechanism in the apparatus of the present invention. FIG. 4 is a sectional view including a block diagram showing an example of the structure of a suction cup used therein. 1...Unshot film storage box, 2...Film, 3a...Pipe, 5...Switching solenoid valve, 6...
Vacuum pump, 7... Suction cup, 8... Motor control circuit, 9... Vertical movement mechanism, 10... Motor, 11...
...Pinion, 12...Rack, 13...Connection rod.

Claims (1)

[Scope of Claims] 1. At least a suction cup 7 which is arranged so as to be able to come into contact with the film 2 housed in the storage box 1 and which suctions the film by adjusting the contact pressure with the film, and the suction cup and a reciprocating mechanism 9 capable of retracting the suction cup from the storage box when the contact pressure with the film reaches a predetermined value. 1. A film take-out device comprising a pressure-sensitive resistor 7a whose resistance value changes as the contact pressure reaches a predetermined value and becomes energized when the contact pressure reaches a predetermined value.