JPH0243366Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a mammography device used to image the breast in, for example, examinations for the purpose of early detection of breast cancer.

[Conventional technology]

As shown in FIG. 6, in this type of mammography apparatus, a mammography cassette 3 is placed and set on a cassette holder stand 2, which serves as a film stand, provided at the bottom of the imager body 1. In order to minimize absorption between the film and the radiator during imaging, the breast 4 is placed directly on the cassette 3 for imaging. At that time, the cassette 3 is attached to the cassette holder base 2.
If the cassette 3 is not firmly fixed, there is a risk that the cassette 3 may shift during imaging, and the cassette 3 may fall off when performing side imaging of the breast 4 with the cassette holder base 2 and the cassette 3 positioned vertically. Become.

Therefore, as shown in FIGS. 7 and 8, bearing stands 5 and 5' are placed on both sides of the cassette holder stand 2 at a location away from the irradiation field for the cassette 3.
and a holding plate 6 made of a metal plate.
, the support shaft 7 protruding from both sides is connected to the bearing stand 5,
A torsion spring 8 inserted through and attached to this support shaft 7 biases the holding plate 6 to rotate, so that the holding plate 6 presses the cassette 3 against the cassette holder base 2. It's getting old.

[Problem that the invention attempts to solve]

By the way, in mammography, special cassettes 3 of various sizes, such as six-cut, four-cut, etc., are used for front and side imaging, and the means for pressing and fixing the cassette 3 is Due to the positional relationship between the irradiation field and the breast 4, it can only be provided on one side of the cassette 3 on the right side in FIG. In order to hold the cassette 3 so that it does not shift or fall under such conditions, a torsion spring 8 with a considerably strong spring pressure is used.

Therefore, when installing the cassette 3, as shown in FIG. 9, while sliding the cassette 3 onto the cassette holder base 2 and pushing it forward in the direction of the arrow, push down the upper end of the holding plate 6 by hand as shown by the dashed line. The lower end of the presser plate 6 is lifted up, and the cassette 3 is inserted and fixed thereunder. On the other hand, when removing the cassette 3 after photographing, as shown in FIG. After releasing the pressing fixation of the cassette 3, pull out the cassette 3 in the direction of the arrow. As described above, when the cassette 3 is frequently installed and removed, the presser plate 6, which is biased by a considerably strong spring pressure, must be pressed each time, resulting in an extremely troublesome operation. Therefore, when removing the cassette 3, as shown in FIG. The pressing plate 6, which is rotationally biased, is strongly struck by the cassette holder base 2, which not only accelerates the deterioration of the cassette holder base 2, but also causes a problem in that a banging sound is generated.

This idea was created in view of these problems, and it is a breast cassette that can be easily attached and removed with a single touch, and that can also securely hold the cassette without it slipping or falling off. The purpose is to provide a photographing device.

[Means for solving problems]

In order to achieve the above-mentioned object, the mammography apparatus of this invention places a mammography cassette on a cassette holder stand provided at the bottom of the imaging apparatus main body,
In this mammography apparatus that performs imaging by placing the breast on the cassette, a bearing body having vertically elongated bearing holes at positions on both sides of the cassette holder base outside the irradiation field for the cassette. are respectively erected, and a rubber roller for pressing the cassette is mounted on the cassette holder base with its roller shaft supported vertically by the bearing hole, and the roller shaft is urged downward by an elastic body. The main structure is as follows.

[Effect]

With the above configuration, when installing the cassette, simply push the cassette in the installation direction while sliding it onto the cassette holder base, and when the tip of the cassette comes into contact with the rubber roller located below the elongated bearing hole, this The rubber roller rotates in contact with the cassette and moves upward smoothly, and the cassette does not move unexpectedly due to the large frictional force of the rubber roller and the urging force of the elastic body whose spring pressure increases due to the elastic body being stretched by the upward movement of the rubber roller. Fixed by pressure.

On the other hand, when removing the cassette, when the cassette is pulled in the removal direction, the rubber roller rolls into contact with the top surface of the cassette, allowing the cassette to slide smoothly against the pressing force and be pulled out. When the roller shaft moves downward and is supported by contacting the lower edge of the bearing hole, the rubber roller does not come into contact with the cassette holder base.
No noise is generated.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

In FIGS. 1 to 4 showing one embodiment, the same or equivalent parts as in FIGS. 6 to 11 are given the same reference numerals.

L-shaped bearing bodies 10 and 11 are erected at positions on both sides of the cassette holder base 2 that are out of the irradiation field for the cassette 3, and extend perpendicularly from both ends of the connecting plate 9, respectively. A roller shaft 15 of a rubber roller 14 is vertically supported in vertically elongated bearing holes 12 and 13 formed in each of the bearing bodies 10 and 11, so that both ends of the roller shaft 15 and each The structure differs from that shown in FIGS. 6 to 11 in that the rubber roller 14 is urged downward by an elastic body 16 made of a spring suspended between the bearing bodies 10 and 11.

Next, the operation of the above embodiment will be explained.
When the cassette 3 is installed, as shown in FIG. is also located at the bottom. Then, the cassette 3 is pushed forward in the direction of the arrow, and from the point at which the tip comes into contact with the rubber roller 14, the rubber roller 14 is smoothly pushed up by the cassette 3 while rotating in the direction of the arrow in FIG. As shown in FIG. 4, when the cassette 3 is set in a predetermined position, the cassette 3 is displaced due to the increased urging force on the rubber roller 14 due to the expansion of the elastic body 6 and the large frictional force of the rubber roller 14. It is retained without any problems. That is, the cassette 3 only needs to be slid and pushed into the cassette holder base 3.

On the other hand, when removing the cassette 3, if the cassette 3 is pulled in the direction opposite to the arrow from the state shown in FIG. 4, the rubber roller 14 rotates in the direction opposite to the arrow, and the cassette 3 can be pulled out smoothly against the pressing force .
Furthermore, when the cassette 3 is detached from the rubber roller 14, the roller shaft 15 is supported by coming into contact with the lower edges of the bearing holes 12 and 13, as shown in FIG. does not occur.

Also, when shooting from the side, as shown in Figure 5,
The cassette holder base 2 is positioned vertically, and the operations for mounting and removing the cassette 3 are performed in exactly the same manner as described above. When the cassette 3 is installed, a force is applied to the cassette 3 in the direction perpendicular to the center of gravity G of the cassette 3 as shown by the arrow, that is, a force that tends to cause the cassette 3 to fall off. It is held in place by a large frictional force. Furthermore, rotational forces in the directions of the arrows are generated at the upper and lower parts of the cassette 3 facing the rubber roller 14, but rotational forces in opposite directions act on the upper and lower parts of the rubber roller 14 that are in pressure contact with the rubber rollers 14. As a result, the rubber roller 14 does not rotate in any direction, and although the rubber roller 14 is slightly twisted at this time, the cassette 3 is held without shifting or falling off due to the restoring force of the rubber itself.

[Effects of the invention] As detailed above, according to the mammography apparatus of this invention, the rubber roller is pivoted and installed on the cassette holder table so as to be movable up and down, and the rubber roller is biased downward. The cassette can be easily installed or removed by simply sliding the cassette onto the cassette holder base and pushing or pulling it. Moreover, the large frictional force of the rubber roller and the downward biasing force of the rubber roller that increases due to the upward movement of the rubber roller make it possible to reliably hold the cassette without shifting or falling off.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the mammography apparatus of this invention, with Figure 1 being a right side view, Figure 2 being a front view of the main parts, and Figures 3 and 4 respectively showing a cassette. Fig. 5 is a right side view of the main parts showing the installation process, Fig. 5 is a right side view of the main parts when photographing from the side, Fig. 6 and the following show the conventional device, Fig. 6 is a right side view, and Fig. 7 is a partial view. FIG. 8 is a partially cutaway right side view, and FIGS. 9 to 11 are right side views showing the cassette mounting operation, cassette removal operation, and cassette removal state, respectively. 1... Photographing device main body, 2... Cassette holder stand, 3
...Cassette, 4...Breast, 10,11...Bearing pair, 1
2, 13...Bearing hole, 14...Rubber roller, 15...Roller shaft, 16...Elastic body.

Claims (1)

[Scope of utility model registration request] In a mammography system in which a mammography cassette is placed on a cassette holder stand provided at the bottom of the imaging apparatus main body, and the breast is placed on this cassette for imaging, the cassette holder stand is out of the irradiation field for the cassette. Bearing bodies each having a vertically elongated bearing hole are installed on both sides of the location, and a rubber roller for pressing the cassette is supported with its roller shaft movable up and down by the bearing hole. and install it on the cassette holder stand,
A mammography apparatus characterized in that the roller shaft is biased downward by an elastic body.