JPS6054658B2 - stopper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stopper device that locks a supplied film to an exposure stage.

Generally, when a stopper device is configured using a rotary solenoid in a film handling device, the film falling through the exposure stage has a fairly large inertial force, so the capacity of the rotary solenoid must be large to block this force. Become.

However, using a large rotary solenoid only for such temporary impact forces increases the size of the device and causes energy loss. In addition, in order to downsize the device, a small rotary solenoid is used to
Although it is possible to boost the excitation voltage, such countermeasures tend to cause the rotary solenoid to heat up due to the application of a voltage that exceeds its rating, shortening its life and contributing to reduced equipment reliability. be. An object of the present invention is to solve the above-mentioned design problems of a stopper device using a rotary solenoid.

The present invention was made by focusing on the fact that the force of the stopper is required when receiving the impact of falling film, but in other cases, for example, when the stopper is waiting in a protruding state, only a small force is required. The stopper device includes a stopper that can freely project onto the exposure stage, and a rotary solenoid that controls the attitude of the stopper, and a switch that detects the film falling in the exposure stage, and a switch that is operated by the switch and that detects the stopper. and a drive circuit that increases the excitation force by boosting the excitation voltage of the rotary solenoid for a certain period of time when the rotary solenoid impinges on the film. Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in the drawings.

FIG. 1 is a cross-sectional view of an image capturing device for photographing a tomographic image of a human body on film using an X-ray tomography device. A cathode ray picture tube 2 for reproducing tomographic images is built into a housing 1 whose interior is a dark box. ing.

In the housing 1, there is an exposure stage 4 facing the picture tube 2 and having an image frame 3, and between the exposure stage 4 and the picture tube 2, a plurality of shutter plates are attached adjacent to each other in the optical axis direction. Stage 6 is provided. Lens plates 8 having the necessary number of photographing lenses 7 for necessary frame-by-frame photography can be attached to these mounting stages 6. The shutter incorporated in the photographic lens 7 is
It is opened and closed in a preprogrammed order, and the reproduced image of the picture tube 2 is exposed to the corresponding screen portion of the film A placed on the exposure stage 4. The film A is taken out from the supply magazine 9 by the suction cup feeding device 10 and transported to the exposure stage 4 by the transport device 11, and the film exposed on the exposure stage 4 is transferred to the storage magazine 13 by the discharge roller 12. taken out.

FIG. 2 is an oblique view of the exposure stage 4 seen from the rear side, and the surface of the mounting plate 14 is provided with a long hole 15 formed in the mounting plate 14 to guide the film in a direction perpendicular to the feeding direction. A pair of guides 16a and 16b are supported.

the guide 16a for regulating the position of the film in the width direction;
16b is a shaft 17 protruding from the back surface of the mounting plate 14;
By manually operating a manual operation plate 18 rotatably supported, two positions can be taken depending on the width of the film. That is, the guides 16a, 16b have one end connected to the manual operation plate 18 with a pin, and the other end thereof is position-controlled by a link 20 engaged with a pin of the guides 16a, 16b protruding from the elongated hole 19 of the mounting plate 14. Ru. The exposure stage 4 is provided with guides 16a and 1 as shown in the accompanying drawings.
Guide position detection switches 20a and 20b are provided which are opened and closed reciprocally depending on the position of guide position detection switch 6b. A stopper device of the present invention whose attitude is controlled by rotary solenoids 21a and 21b is provided below the manual operation plate 18.

Each stopper device is supported by a bracket 22a installed on the mounting plate 14 and includes a rotary solenoid 21a.
、． Stopper 2 fixed to shaft 22 connected to 21b
Equipped with 3. Therefore, the rotary
The solenoids 21a and 21b are connected to the guides 16a and 16.
Guide position detection switches 20a, 2 for detecting the position of b
Since the film is reciprocally excited by 0b, the stopper 23 extending into the film feeding path regulates the stop position of the film according to the film feeding direction dimension. Third
The figure shows a drive circuit for the stopper device, and a switch 24 connected in series to the guide position detection switches 20a and 20b is closed when the film is supplied to the exposure stage 4, and is opened in response to a film ejection signal. It's a switch.

Further, a make switch 26 connected to a timer which is closed when the film A falls is connected in parallel to resistors 25a and 25b connected in series to the coils of the rotary solenoids 21a and 21b. Since the apparatus of the embodiment has the above-described configuration, only one of the guide position detection switches 20a or 20b is closed by selecting the positions of the guides 16a and 16b.

Then, when the film A is sent out from the supply magazine 9,
Switch 24 is closed and the corresponding rotary solenoid 21a or 21b is energized. however,
Since this excitation voltage is below the rated voltage divided by the resistors 25a and 25b, the rotary solenoid 21
Even if the stopper 23 is kept in a standby state by the stoppers a and 21b for a long time, there is no risk of the rotary solenoids 21a and 21b being burnt out. Next, when the fall of the film A in the exposure stage 4 is detected by the make switch 26,
This make switch 26 is temporarily closed. As a result, the power supply voltage exceeding the rating of the rotary solenoids 21a, 21b is directly applied to the rotary solenoids 21a, 21b.
21b and rotary solenoids 21a, 21
The excitation force of b is increased for a certain amount of time. For this reason, the stopper 23 blocks the falling film A, but since the excitation of the rotary solenoids 21a and 21b that are not rated is temporary, even if the capacity is small, they can withstand it sufficiently. No need to point it out. As explained above, according to the present invention, it is possible to provide a stopper device using a small-sized rotary solenoid, and furthermore, it is possible to obtain a stopper device with an extremely large stopping force. The stopper device has advantages such as making it possible to handle heavy and large-sized films.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an image capturing device embodying the present invention;
The figure is a perspective view of the exposure stage of the image capturing apparatus seen from the back, and FIG. 3 is a drive circuit diagram of the rotary solenoid. 21a, 21b...Solenoid, 22
...Shaft, 23...Stopper, 25a, 25
b...Resistor, 26...Make switch, A...Film.

Claims (1)

[Claims] 1. A stopper device including a stopper that can freely project onto an exposure stage and a rotary solenoid that controls the attitude of the stopper, including a switch that detects a film falling in the exposure stage, and a switch that is operated by the switch and that causes the stopper to and a drive circuit that increases the excitation force by increasing the excitation voltage of the rotary solenoid for a certain period of time to stop the film.