JPH0371696B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sheet film snapshot device used for X-ray diagnosis.

[Technical background of the invention]

While observing the X-ray fluoroscopic image of the subject captured by an X-ray television camera in one of the X-ray diagnosis devices, when the fluoroscopic image reaches the desired state, the film is sent into the X-ray irradiation field and the fluoroscopic conditions are set. There is a snapshot apparatus in which an X-ray image is photographed on the film by switching the X-rays from X-ray irradiation to X-ray irradiation under photographing conditions.

This snapshot device stores sheets of film one by one in a film cassette, moves the film cassette to the shooting position at the time of shooting, and immediately returns it from the shooting position after shooting. In this case, a separate film cassette must be prepared for each film, which is inconvenient to handle.In recent years, this film cassette has been replaced by the cassette-less method, in which the sheet film is directly moved for quick copying. Sheet film copying devices have been put into practical use and are becoming mainstream.

This cassetteless type sheet film copying apparatus is constructed as shown in FIG. That is, in the figure, 1 is a film storage magazine that stores a plurality of unphotographed sheet films 2, and the plurality of sheet films 2 stored in this film storage magazine 1 are arranged in order from the top film to the top and bottom. A suction rubber cup 3, which is movable in the U-D direction and the left-right arrow L-R direction, allows the film storage magazine 1 to be suctioned and taken out one by one from an opening provided at the top of the film storage magazine 1. Reference numeral 4 denotes a pair of transport rollers for taking the sheet film 2 in and out of the contact plate 5 when the contact plate 5 is at the standby position 6. When the suction rubber cup 3 is moved to the position of the pair of transport rollers 4, the sheet is removed. The film 2 can be held by the transport rollers 4. Therefore, by rotating the conveying rollers 4, the sheet film 2 is conveyed to the close contact plate 5 which is placed open at a standby position 6 between which the sheet film 2 is held between the conveying rollers 4. The contact plate 5 is the front plate 5A and the board 5
It is a plate-shaped thing made of B, and the conveying roller 4 side is the free end side, and the opposite end side is the pivot side, so that it can be opened and closed. It is now possible to move. At the film loading/unloading position near the standby position 6, the close contact plate 5 is opened by rotating the substrate 5B in the direction of arrow B, and is closed when moved. When the sheet film 2 is fed into the contact plate 5 at the film attachment/detachment position 6, the contact plate 5, for example, closes the substrate 5B in the direction of the arrow A, and clamps the sheet film 2 therebetween. Then, it is moved to the standby position 6, and waits at this standby position 6 until a photographing command is given.

When an imaging command is received, the contact plate 5 is sent to the imaging position 7, which is the irradiation field position of the X-ray tube XT, and after the imaging is completed,
It is returned to the standby position 6 again. Then, it is moved to the film loading/unloading position near the standby position, where the contact plate 5 opens the substrate 5B in the direction of arrow B, and at the same time, the conveying roller 4 is reversed, whereby the exposed film in the contact plate 5 is The paper is picked up by the rotating transport rollers 4 and taken out.

A direction switching plate 8 is provided on the exit side of the conveyance roller 4 so as to be able to rotate in the direction of the arrow E-F with the pivot 8A as a fulcrum, so the direction switching plate 8 is rotated in the E direction. Possibly transport roller 4
The photographed film fed out is guided by the direction switching plate 8 and guided to a guide 9 which is a path to a photographed film storage magazine 10 for storing the photographed film. As a result, the photographed film is guided by the guide 9 and sent into the photographed film storage magazine 10, where it is stored.

In addition, P is a subject, BT is a bed, and II is an image intensifier for converting an X-ray image into an optical image.

By the way, the positional relationship between the contact plate 5 and the conveying roller 4 at the film attachment/detachment position is as shown in FIG. 2 so that the sheet film can be smoothly loaded and unloaded onto the contact plate 5 by the operation roller 4.

That is, the adhesion plate 5 has a portion on both sides cut out so that the conveyance rollers 4 can be positioned therein, and in this position, the sheet film 2 is held at both ends by the conveyance rollers 4, respectively. Become. Therefore, the sheet film 2 is held at both ends by the conveying roller 2 at this film attachment/detachment position, and can be fed into or taken out from the contact plate 5 by controlling the forward/reverse rotation of the conveying roller 4.

The situation will be explained with reference to FIG.

When loading a film, the contact plate 5 is open as shown in Figure A, and the conveying roller 4 is rotating normally. When the sheet film 2 is fed, it is held between the conveying rollers 4 and sent into the back of the contact plate 5 as the rollers rotate. Near the opening of the contact plate 5, in order to detect when the end of the film has passed, an appropriate non-contact type sensor S is provided that has less negative effects such as exposing the film, and this sensor S detects the end of the film. Then, after a predetermined period of time has elapsed, the rotation of the conveyance roller 4 is stopped. This is the state shown in figure b. As a result, the sheet film 2 is set in the contact plate 5 such that the end portion thereof is at a predetermined position on the contact plate 5. Next, the contact plate 5 is closed as shown in Fig. c, and the pair of transport rollers 4 are separated from each other as shown in Fig. d to release the sheet film 2 from being held by the transport rollers 4. Thereafter, the contact plate 5 is moved to the standby position as shown in Figure e.

When taking out a photographed film, the reverse operation is performed.

As described above, many types of sheet films with different film sizes can be set on the contact plate 5 aligned with the entrance side of the contact plate 5 as a reference, but as shown in FIG. Since this method detects the end face of the film that is above the detection position of the sensor S, the film loading position is determined based on this position, and even if the film is set diagonally as shown in 2', this will be detected. Also, the position cannot be corrected.

Therefore, even if a photograph is taken under such conditions, it will not be known until the sheet film is developed, and in some cases, the photograph may have to be taken again later, resulting in wasted time and film. In addition, this results in unnecessary X-ray exposure to the subject.

[Purpose of the invention]

The present invention has been developed in view of the above-mentioned circumstances, and allows sheet films of various sizes to be aligned with the entrance side of the contact plate as a reference, and to reliably set the films in a fixed position. To provide a sheet film snapshot device capable of eliminating failures.

[Summary of the invention]

That is, in order to achieve the above-mentioned object, the present invention utilizes a pair of substantially plate-like bodies that can be opened and closed to hold the film in close contact with each other by taking out the sheet-like film one by one from the film storage section and moving it to the film loading/unloading position. In a quick-photographing apparatus which takes an X-ray by sending the film to a plate and clamping the film, and after loading the film, the contact plate waits at a standby position, and then sends the film to the imaging position within the X-ray irradiation field to take an X-ray image. A stopper is provided at the film loading/unloading side end to adjust the position of the internal film end, and the film is loaded/unloaded by sandwiching the side edge of the film inside the tight plate at the film loading/unloading position between a pair of rollers. Further, when loading a film, after the transport roller feeds the film into the contact plate, the contact plate is closed and the contact plate is moved in the film feeding direction; A control means is provided for rotationally driving the conveying roller in the film feeding direction at a circumferential speed slower than the moving speed of the contact plate, and after the film is fed into the contact plate at the film loading/unloading position, the contact plate is closed. Thereafter, the contact plate is sent in the film feeding direction, and the conveying rollers that clamp both ends of the film are rotated in the film feeding direction at a speed slower than the speed of the contact plate, thereby transporting the film within the contact plate. is moved toward the stopper, thereby aligning the end of the film against the stopper.

[Embodiments of the invention]

4 to 7 regarding one embodiment of the present invention.
This will be explained with reference to the figures.

FIG. 4 is a side sectional view showing the main structure of the free end side (inlet side) of the contact plate part of the device according to the present invention, with a showing the open state and b showing the closed state. . In the figure, 41 is a front plate of the contact plate, 42 is an intensifying screen provided inside the front plate 41, 43 is a substrate, 44 is a felt serving as a cushion material provided inside this substrate 43, 4
5 is an intensifying screen provided on the surface side of the felt 44. Reference numeral 46 denotes an elastic stopper such as an L-shaped spring provided at the end of the substrate 43 on the entrance side of the contact plate. This stopper 46 is attached from the back surface of the board 43 to the side surface with the inner corner of the L-shape touching the corner of the board 43, and the end of the stopper 46 is screwed on the back side of the board 43 with a screw 47. . Further, the end of the stopper 46 on the front plate 41 side protrudes beyond the surface position of the intensifying screen 45 on the felt 44, and as shown in FIG.
3, the upper end of the stopper 46 comes into contact with the front plate 41, which pushes the stopper 46 downward in the figure using the screw 47 as a fulcrum, allowing the contact plate to be completely closed. . Also, the stopper 46 is connected to the front plate 4.
The tip of the first side does not touch the intensifying screen 42 on the front plate 41 side. Therefore, when the contact plate is closed, the sheet film 2 sandwiched between the intensifying screens 42 and 45 does not reach the stopper. It is arranged to be located at a lower position than the tip of 46.

This attachment/detachment contact plate is basically the same except that it is provided with a stopper 46 and is cut out from the position where the conveyance roller 4 is located to the free end side so that it does not hit the conveyance roller 4 even when the closeness plate is moved. Basically, there is no difference from the contact plate 5 shown in FIG. Further, as shown in FIG. 6, stoppers 46 are provided at several locations on the entrance side (free end side) of the contact plate, so that no matter what size the film is, the end portion is in contact with at least two stoppers so that the position can be corrected. I'm starting to be able to do it. Of course, if no particular problem arises, a stopper with a length that spans almost the entire length may be provided on the side portion on the inlet side. In addition, when loading a film at the film loading/unloading position, this device rotates the conveying roller 4 at a normal rotational speed, feeds the sheet film 2, and after detecting the end of the sheet film 2 with the sensor S, feeds the sheet film 2 for a predetermined time and then feeds it once. is stopped and the contact plate is closed, and then the rotational speed of the transport roller 4 is slowed down and feeding is started again, and at the same time, the contact plate is moved in the film feeding direction at a speed faster than this feeding speed until it reaches a predetermined standby position. It has a control system to move it. Further, when taking out the photographed film, the contact plate is moved to the film attachment/detachment position, and at this time, the conveying roller 4 is reversely rotated at the same circumferential speed as the feed speed of the contact plate, and the film is sandwiched between the rollers. The control system opens the contact plate when it stops at the film loading/unloading position, and at that point switches to reverse rotation at a steady circumferential speed to take out the film.

Of course, in this case, the pair of rollers may be changed from the state e to the state c in FIG. 2 at the stage of nipping the film between the transport rollers 4.

Next, the operation of this device having the above configuration will be explained.

In this device, as shown in FIG. 5a, when feeding the unphotographed sheet film 2 into the contact plate, the contact plate is opened at the film loading/unloading position, and the sheet film 2 is transported by the conveying roller 4 at a steady state. Feed it into the contact plate at high speed. When the sensor S detects the end of the sheet film 2, the rotation of the transport roller 4 is stopped after a predetermined period of time. At this point, the sheet film 2 is completely inserted into the contact plate with its ends being held by the conveying rollers 4.

Next, as shown in FIG. 5B, the contact plate is closed, and then the contact plate is moved to the standby position at a speed of _V12 , and the conveying roller 4 is rotated at a circumferential speed of _V11 . The moving direction of the contact plate and the film feeding direction of the conveying roller 4 are, of course, the same direction as the film feeding direction when loading the film. At this time, the peripheral speed V ₁₁ of the conveyance roller 4 is set to be slower than the moving speed V ₁₂ of the contact plate.

As described above, the contact plate is provided with a stopper 46 on its inlet side, and the end of this stopper 46 is located at a higher position than the end of the sheet film 2 within the contact plate. Therefore, as a result of making the circumferential speed of the conveying roller 4 slower than the feeding speed of the contact plate, the film 2, which is fed with the end portion held by the conveying roller 4, is fed at a slower speed than the contact plate, and the film 2 is fed at a slower speed than the contact plate. Inside, the film 2 is relatively returned to the entrance side of the contact plate.

Therefore, the end of the sheet film 2 comes into contact with the stopper 46 and is adjusted in position by the stopper 46. This situation is shown in FIGS. 5c and 6.

Therefore, even if the sheet film 2 is fed diagonally into the contact plate, the film is rotated using the end of the film that first contacted the stopper 46 as a fulcrum, and when the end of the film 2 is in contact with a plurality of stoppers, The sheet film 2 is set at a fixed position within the contact plate.

Generally, even if the film is loaded diagonally, the condition will not be extremely diagonal compared to normal, so the position will be adjusted smoothly so that it takes the normal shape in the fixed position. Become.

An example of a control system for controlling switching of the rotational speed of the conveyance roller 4 is shown in FIG.

In the figure, M is a DC motor that rotationally drives the conveyance roller 4, and A is an amplifier, TR1, TR2.
is an NPN or PNP type switching transistor, and its base side is connected to the output side of amplifier A. When TR1 is on, a positive DC potential of +12V is applied to the motor M via this transistor T1, and when TR2 is on, a negative DC potential of -12V is applied to the motor M via this transistor TR2.

Amplifier A also has four inputs for control inputs.
EA, EB, EC, ED are resistors R1, R2, respectively.
For example, EA and EB can be supplied with a positive DC voltage +15V through a switch not shown, and EC and ED can be supplied with a negative DC voltage - through a switch not shown. 15V is now provided. Further, among the resistors R1 to R4, R1 and R4 are variable resistors, so that the input levels of EA and ED to the amplifier A can be adjusted. Furthermore, the amplifier A output side of R3 and R4 is pulled down to ground via a resistor R5, and transistors TR1 and TR
The motor M output side of No. 2 is connected to the amplifier A output side of resistors R1 and R2 via feedback resistors R6 and R7.

In such a configuration, EA to ED are selectively applied according to the operation sequence of the mechanism by a control device (not shown) that controls the mechanism of the snapshot device. That is, when EA or EB is selectively input, these EA and EB are at positive potential, and the amplifier A
After amplifying with
TR1 is turned on, and this TR1 applies a positive voltage corresponding to the base potential to the motor M from the +12V power supply. As a result, the motor M rotates in the normal direction at a rotational speed corresponding to the applied voltage. Also EC
Alternatively, when ED is selected, these voltages are negative voltages, so when they are amplified by amplifier A and then applied to the bases of transistors TR1 and TR2, PNP type transistor TR2 is turned on. Since a negative voltage corresponding to the base potential of this transistor TR2 is applied to the motor M, the motor M rotates in reverse at a rotational speed corresponding to this applied voltage.

Since EA and ED are applied to amplifier A through variable resistors R1 and R4, the rotational speed of motor M can be set to the desired speed by adjusting the resistance value, so R1 is set to V ₁₁ when feeding the film. R2 is adjusted to a speed such that the film is smoothly held by the conveying roller 4 when the contact plate returns to the film loading/unloading position after photographing. Then, at the time of feeding, EB is selected and applied, EB is turned off when the sheet film 2 is stored in the contact plate, and then EA is applied at the same time as the contact plate is closed and the contact plate is moved. , set the sheet film 2 to the correct position. Then, turn off the EA at this stage.
When shooting is completed, ED is selected and applied when the contact plate returns to the film attachment/detachment position, and ED is turned off when the contact plate reaches the film attachment/detachment position.
Next, open the contact plate, apply EC, and take out the film inside the contact plate. By performing such sequence control with a control device (not shown), the process from loading to unloading the film can be carried out smoothly, and the film is set in the correct position in the adhesion plate, and the film is Diagonal set etc. are eliminated,
No more shooting failures caused by setting the film diagonally.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope without changing the gist thereof.

〔Effect of the invention〕

As described in detail above, the sheet-like film of the present invention is taken out one by one from the film storage section and fed to the close plate for holding the film, which is a pair of almost plate-shaped bodies that can be opened and closed and moved to the film loading/unloading position. At the same time, after loading the film, the contact plate is kept at a standby position, and during imaging, the contact plate is sent to the imaging position within the X-ray irradiation field for X-ray photography. A stopper is provided to adjust the position of the end of the film inside, and the side edge of the film in the contact plate is held between a pair of rollers on both sides of the contact plate at the film attachment/detachment position to attach/detach the film. Further, when loading a film, after the film is fed into the contact plate by the transport roller, the contact plate is closed and the contact plate is moved in the film feeding direction. The structure includes a control means for rotationally driving the film in the film feeding direction at a circumferential speed lower than the moving speed of the contact plate, and after the film is fed into the contact plate at the film attachment/detachment position, the contact plate is closed, and then the contact plate is closed. The film is moved in the direction of the stopper within the contact plate by feeding the contact plate in the film feeding direction and rotating the transport rollers that clamp both ends of the film at a speed slower than the feed speed of the contact plate and in the film feeding direction. By doing this, the end of the film is brought into contact with the stopper to adjust its position, so even if the film is fed into the contact plate at an angle, it will be automatically adjusted to the correct position.
Therefore, since the film is no longer set diagonally, it is possible to provide a quick-shooting apparatus having the feature that there is no possibility of photographing failures caused by this.

[Brief explanation of drawings]

Figure 1 is a diagram for explaining the outline of a snapshot device;
FIG. 2 is a diagram for explaining the state of loading the film onto the contact plate in the conventional device, FIG. 3 is a diagram for explaining the occurrence of diagonal setting of the film in the conventional device, and FIG. 4 is a diagram for explaining the situation in the device according to the present invention. FIG. 5 is a diagram showing the configuration of the stopper portion in the contact plate portion, FIG. 5 is a diagram showing the state of the stopper portion in the open and closed states of the contact plate of the device according to the present invention, and FIG. 6 is a diagram illustrating the state of film positioning by the stopper. FIG. 7 is a circuit diagram showing an example of the drive control paper for the transport roller. DESCRIPTION OF SYMBOLS 1... Film storage magazine, 2... Sheet film, 3... Rubber cup for adsorption, 4... Conveyance roller, 5... Close contact plate, 5A, 41... Front plate, 5B, 43... Substrate, 6... Standby position, 7...
... Shooting position, 10... Photographed film storage magazine, 42, 45... Intensifying screen, 44... Felt, 46... Stopper, S... Sensor.

Claims (1)

[Claims] 1. A sheet of unphotographed film is taken out one by one from the film storage section and sent to a close contact plate for film holding, which is a pair of almost plate-shaped bodies that can be opened and closed, which have been moved to the film loading/unloading position, where they are held and the film is loaded. Afterwards, this contact plate is placed in a standby position, and during imaging, this contact plate is sent to the imaging position within the X-ray irradiation field to perform X-ray photography. A transport roller is provided with a stopper for adjusting the position of the film, and the side edge of the film in the contact plate is held between a pair of rollers in the vicinity of the contact plate at the film installation/detachment position to perform the film installation/detachment. In addition, when loading the film, after the transport roller feeds the film into the contact plate, the contact plate is closed and the contact plate is moved in the film feeding direction, and the peripheral speed of the transport roller is set to the contact plate. A snapshot apparatus characterized in that it is provided with a control means for rotationally driving the film in the feeding direction at a speed slower than the moving speed of the plate.