JPH0433215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a bed device for a diagnostic device used in a diagnostic device such as an X-ray imaging device.

(Prior Art) Various types of bed devices for diagnostic equipment have been proposed in the past, and among them, the operating mechanism of a bed device whose top plate itself can be rotated will be described with reference to FIGS. 5 to 7 a and b. Explain.

FIG. 5 is an external perspective view of the X-ray imaging apparatus.

In the illustrated apparatus, an X-ray tube 2 and a fluorescence intensifier tube (hereinafter referred to as I.I.) 3 are arranged facing each other on a side portion 1a of a main body 1. The I.I.3 is provided with an indirect camera that records the I.I output image on film.
A curved top plate 7 on which a subject 6 is placed is arranged between the X-ray tube 2 and I/I3. This curved top plate 7 has an X
In order to perform fluoroscopic imaging by changing the incident angle of the line, the top plate is configured to rotate or swing by a predetermined angle in a direction intersecting the body axis of the subject (top plate rolling). The mechanism principle for performing top plate rolling in this manner is shown in FIGS. 6a and 6b and 7a and 7b.

That is, in the case shown in FIGS. 6a and 6b, the rotation center 7a of the curved top plate 7 is provided near the body axis center 6a, so that the rotation center 7a of the curved top plate 7 does not shift from the body axis center 6a as the curved top plate 7 rotates. It is something. On the other hand, Fig. 7a,
In the case shown in b, the center of curvature 7b of the curved top plate 7 and the center of rotation 7a of the curved top plate 7 are formed to coincide with each other.

(Problem to be Solved by the Invention) In the former case, since the distance between the curved top plate 7 and the I/I upper surface 3a decreases when the curved top plate 7 rotates at its maximum (see FIG. 6b), It is necessary to provide a large amount of curved top plate 7 and I, I upper surface 3a in advance. Therefore, the increase in the spacing causes geometric blurring of the image. However, in the latter case, as the curved top plate 7 rotates, the center of the body axis of the subject 6 inside the curved top plate 7 shifts from the X-ray center as shown in FIG. At the same time as the center of rotation, move the curved top plate 7 in the left-right direction (rightward movement in the illustrated example), move the body axis center 6a toward the X-ray center 8 side, and after aligning the two, perform X-ray fluoroscopic imaging. must be done. In addition, in an attempt to solve the above problems, it was disclosed in Japanese Patent Application Laid-Open No. 57-45851, but this made the mechanism complicated and
Two operations, the rotation of the curved top plate and the movement of the bed device, must be adjusted, and the operations are complicated. Further, there is a problem in that the operation time is long due to the waiting time for the evacuation operation.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a bed device for a diagnostic device that solves the above-mentioned problems.

[Structure of the invention] (Means for solving the problems) The structure of the present invention for solving the above problems is as follows:
A bed device for a diagnostic device that performs diagnosis by placing a subject on a top plate, which comprises: a rotating shaft provided at the end of the top plate; a bearing rotatably supporting the rotating shaft; a mounting member that is slidably supported in the vertical direction; an arm that is provided at the end of the rotating shaft and projects in a direction parallel to the axis while being offset from the center of the rotating shaft; and a length that engages with the arm. A first power transmission mechanism having holes drilled in the radial direction, and a second power transmission mechanism that transmits power to the first power transmission mechanism.
a power transmission mechanism, a drive source that powers the second transmission mechanism, a protrusion fixed to the top plate side of the mounting member, and a protrusion provided at the end of the top plate to engage with the protrusion, the top plate The top plate is characterized by having a cam consisting of a groove formed to move the top plate in the vertical direction as the top plate rotates.

(Operation) The operation of the present invention having the above configuration is that the rotation angle or rotation speed of the drive source is transmitted to the front cam via the second and first power transmission mechanisms, and the rotation angle and the perforation of the top plate are transmitted to the front cam through the second and first power transmission mechanisms. The amount of movement is determined in the vertical direction of the front cam that is moved according to the groove. Therefore, the same driving source can rotate the top plate and move the top plate in the vertical direction in proportion to this rotation.

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic front view of an apparatus according to an embodiment of the present invention.

Attachment members 1 are attached to the illustrated left and right ends of the illustrated bed device 15.
1A and 11B are provided standing upright in the vertical direction. Note that the fluorescence multiplier tube (not shown) is installed inside this bed device 15.

On the inside of the mounting members 11A, 11B are front cams 10, 10, a top plate 9 to which the front cams 10, 10 are fixed at right angles to both ends thereof, and on the outside via the mounting member 11A are the front cams 10. a gear 12 serving as a first power transmission mechanism having an elongated hole that engages with a convex portion formed on the open end side of the rotating shaft 16;
It is configured to include a gear 13 serving as a second power transmission mechanism that meshes with this gear, and a drive source such as a motor 14 in which the second gear 13 is attached to a rotating shaft 14a. Note that 17 is a slide bearing that rotatably supports the rotating shaft 16.

FIGS. 2a and 2b are an enlarged side view and an enlarged front view of the vicinity of the mounting member 11A.

A groove 10a having, for example, an inverted heart-shaped cam profile is formed on the surface 10b of the front cam 10 facing the mounting member 11A. Further, in the center of the front cam 10, a cylindrical rotating shaft 16 centered on the axis 0 is provided. An arm portion 16a is provided at the open end of the rotating shaft 16 in a plane orthogonal to the axis 0, and a cylindrical convex portion 16b is provided at the tip of the arm portion 16a in parallel to the axis 0. There is. Note that the arm portion 16a and the convex portion 16b may be formed integrally as shown, or may be formed as separate members and then combined. Therefore, the front cam 10 is rotated around the axis 0 when a force substantially perpendicular to the plane of the drawing is applied to the convex portion 16b.

The slide bearing 17 is slidably supported by a slide portion 18 formed of an elongated hole whose elongated axis extends in the vertical direction, which is bored in the mounting member 11A. Further, the rotating shaft 16 is inserted into a substantially central portion of the slide bearing 17.
Therefore, the slide bearing 17 and the front cam 16 can move together in the direction of arrow A or B.

A guide convex portion 19 is formed to protrude from a surface 11b of the mounting member 11A facing the front cam 16 and vertically below the slide portion 18.
The convex portion 19 may be, for example, a member formed in a cylindrical shape, but in this embodiment, considering friction etc.,
Furthermore, rollers 20 are provided on the outside for rolling contact. Further, this guide convex portion 19 is adapted to engage with a groove 10a formed in the front cam 10.

On the outside of the mounting member 11A, a first gear 12 is rotatably attached to a shaft member (not shown) about axis 0. This first gear 12 has an elongated hole 21 formed on a straight line passing through the center of rotation 0. This elongated hole 21 has the rotary shaft 16
The convex portions 16b of the two come to engage with each other. Therefore, when the first gear 12 is rotationally driven, this driving force is transmitted to the front cam 10 via the convex portion 16b and the arm portion 16a.

A second gear 13 is arranged to mesh with the first gear 12. Further, this second gear 13 is attached to a rotating shaft 14a of a drive source, for example, a pulse motor 14. Therefore, the rotation of the pulse motor 14 rotates the front cam 10 via the second gear 13, first gear 12, convex portion 16b, and arm portion 16a.

FIGS. 3a and 3b are an enlarged side view and an enlarged front view of the vicinity of the mounting member 11B shown in FIG. 1.

The functions and effects of the bed device configured as described above will be explained.

When the second gear 13 is driven at a predetermined angle or at a predetermined rotational speed in the direction of arrow C from the position shown in FIG. 2a, the first gear 12 is rotated in the direction of arrow D in a certain relationship. . The first gear 12 is provided with the elongated hole 21, and the rotating shaft 1
The convex portion 16 formed at the tip of the arm portion 16a of No. 6
b is adapted to engage, so that as the first gear 12 rotates, the front cam 10 is also rotated in the direction of the arrow D together with the convex portion 16b (see FIG. 4). In this case, the front cam can also be rotated once.

By the way, the guide portion 19 formed on the mounting member 11A has a groove 10 formed on the front cam 10.
It is engaged with a. Therefore, the front cam 10 is moved upward or downward by the amount of displacement in the vertical direction of the groove 10a, that is, in the direction of arrow A, while being guided by the convex portion 19. In this case, the top plate 9
When the front cam 10 is aligned with the center of rotation of the front cam 10 and fixed, the body axis of the subject to be placed will not be displaced to the left or right in the drawing. The amount of displacement in the vertical direction can be arbitrarily set by appropriately combining the number of teeth of the first and second gears, the length of the arm of the rotating shaft, and the contour line of the groove. Therefore, adjustment in the vertical direction for each rotation angle of the top plate is not necessary.

From this, if the rotation speed or angle of the same driving source is determined, the angle and height of the top plate can be moved accordingly. In this way, since both are driven simultaneously by the same drive source, handling is easy and the mechanism is extremely simple. Furthermore, there is no waiting time for the evacuation operation, which conventionally occurs.

It should be noted that the present invention is not limited to the illustrated embodiments described above, and various modifications can be made within the scope of the invention.

For example, although the front cam is an example in which a heart-shaped cam that performs constant speed movement is used, the present invention is not limited to this, and a positive cam having an arbitrary contour curve may also be used. good.

The power transmission mechanism may also be a combination of a pulley and a belt or a chain lock.

[Effects of the Invention] Even when performing diagnosis by rotating the top plate, the top plate can be moved vertically without shifting the body axis located on the axis of rotation from the center of imaging, which simplifies the operator's work. A diagnostic bed apparatus can be provided.

[Brief explanation of drawings]

Figure 1 is a front view of a bed device according to an embodiment of the present invention, Figures 2a and b are enlarged side views and enlarged front views of the bed device shown in Figure 1, and Figures 3a and b are shown in Figure 1. An enlarged side view and an enlarged front view of the other end of the bed device, FIG. 4 is an operation explanatory diagram, and FIG. 5 is an example of the diagnostic device.
External perspective view of the radiation diagnostic device, Figures 6a, b and 7
Figures a and b are explanatory views of the operation of the top plate. 9...Top plate, 10...Front cam, 11A, 11B...
Mounting member, 12...first gear, 13...second gear, 4...drive source, 16...rotation shaft.

Claims (1)

[Scope of Claims] 1. A bed device for a diagnostic device that performs diagnosis by placing a subject on a top plate, which comprises: a rotating shaft provided at the end of the top plate; and a rotary shaft that rotatably supports the rotating shaft. a mounting member that supports the bearing in a vertically slidable manner; an arm provided at the end of the rotating shaft and protruding in a direction parallel to the axis while being offset from the center of the rotating shaft; A first power transmission mechanism that has an elongated hole drilled in the radial direction that engages with the arm, a second power transmission mechanism that transmits power to the first power transmission mechanism, and a second power transmission mechanism that transmits power to the second power transmission mechanism. a drive source that provides a drive source that provides a protrusion fixed to the top plate side of the mounting member, and a protrusion that is provided at the end of the top plate to engage with the protrusion and moves the top plate in the vertical direction as the top plate rotates. 1. A bed device for a diagnostic device, characterized in that it has a cam formed of a groove and a cam. 2. The bed device for a diagnostic device according to claim 1, wherein the groove has a heart-shaped contour curve.