JPH0125947Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotating X-ray photography cassette changer for exchanging X-ray films used in medical X-ray photography.

(Prior Art) Conventionally, many types of cassette changers for X-ray photography have been developed, such as a parallel feed type and a rotating type.The rotary type moves the cassette close to the subject on the imaging table during imaging. It is necessary to move it away from the photographing stand, rotate it (replace it), and then promptly send it to the photographing position. For this purpose, devices have been devised to ensure smooth rotation, such as the patent No. 534801 system in which the shaft rotates along a guide rail, and the system using a spring.

(Problem to be solved by the invention) However, even methods such as the patent No. 534801 method and the sebane utilization method have a limit to their rotational speed.
It has been difficult to exchange two cassettes per second using large cassettes such as long ones.

An object of the present invention is to provide a rotary X-ray cassette changer that solves these conventional problems and allows cassettes to be exchanged smoothly and quickly.

(Means for solving the problem) The gist of the present invention that solves the problem is that the eccentric rotating shafts protruding from the left and right sides of the cylindrical guide are supported by the left and right columns, respectively, and the eccentric rotating shafts are connected to the electric motor. The outer rotating frame is rotatably mounted outside the cylindrical guide and has three or more N X-ray cassette attachment parts, A fixed gear concentric with the center is fixed to the support, an outer rotating frame gear is fixed to the inner peripheral edge of the outer rotating frame, and an intermediate gear that rotates in mesh with the fixed gear and the outer rotating frame gear is cylindrical. A rotation characterized in that a plurality of fixed gears, intermediate gears, and outer rotating frame gears are attached to the side of the guide, and the diameter and number of the fixed gear, intermediate gear, and outer rotating frame gear are set so that the outer rotating frame rotates 1/N when the cylindrical guide rotates once. Type X
Located in the line photography cassette changer.

(Function) In the present invention, in order to smoothly replace the cassette while retracting the cassette frame from the photographing position, a cylinder is used as a rotation guide for the outer rotating frame, which has N (N is a number of 3 or more) cassette attachment parts. A shaped guide is provided inside the outer rotating frame. Therefore, when the eccentric rotating shaft is rotated using power from an electric motor, etc., the cylindrical guide rotates around the eccentric rotating shaft located eccentrically from the center, and the intermediate gear that meshes with the fixed gear of the column also rotates around the eccentric rotating shaft. Rotates while circling. The rotation of the intermediate gear rotates the intermediate gear that meshes with the outer rotating frame gear via other intermediate gears,
As the intermediate gear rotates, the outer rotating frame gear meshing with the intermediate gear and the outer rotating frame with the gear fixedly fixed to the inner surface are sent in a direction opposite to the rotating direction of the cylindrical guide, and the rotational speed of the outer rotating frame is slowed down. As a result, even if the cylindrical guide makes one revolution, the outer rotary frame advances only 1/N of one revolution, so that one cassette mounting portion is advanced and one cassette frame is replaced.

(Example) To explain one example of the present invention with reference to the drawings, a rotary cassette chainer fixed inside the X-ray imaging table 1 serves as a rotation guide for the outer rotating frame with two supports 2 and 2'. A toothed pulley that supports the eccentric rotating shaft 4 of the inner cylindrical guide 3 and is rotatably attached to the shaft end of one eccentric rotating shaft 4 of the inner cylindrical guide 3 is driven by a toothed belt 5 and an electric motor 6. The inner cylindrical guide 3 is rotated by. In addition, five cassette attachment parts 7, 7', 7'', 7 are attached to an outer rotating frame 8 which is structured to rotate the outer side of the inner cylindrical guide 3.
, 7''''', and the outer rotating frame 8 is rotated by exactly 1/5 rotation for each rotation of the inner cylindrical guide 3.
In order to accurately replace the cassette attachment part 7 one by one, a fixed gear 9 is provided that is fixed to the support 2 with the eccentric rotating shaft 4 on the support 2 side as the center, and is attached to this and the outer rotation frame 8 so that it faces inward. Outer rotating frame gear 1
Intermediate gears 11, 12, and 14, the number of teeth of which have been adjusted in consideration of the rotation ratio, are interposed between the intermediate gears 11, 12, and 14, and the shaft fixed to the side surface of the cylindrical guide 3 as the rotating shaft, and both gears are meshed. The rotating shaft 13 of the intermediate gear 12 for adjusting the rotation ratio, which is fixed overlapping with the intermediate gear 11 that meshes with the fixed gear 9, is attached to the side surface of the inner cylindrical guide 3, and the intermediate gear 12 for adjusting the rotation ratio and the outer rotating The rotating shaft of the rotational direction adjusting intermediate gear 14 that meshes with the frame gear 10 is also fixed to the side surface of the inner cylindrical guide 3.

With the above configuration, the inner cylindrical guide 3
When rotating, as shown in FIGS. 2A, B, C, D, and E, the intermediate gear 11 meshing with the fixed gear 9, the rotation shaft 13 of the rotation ratio adjustment intermediate gear 12, and the rotation axis of the rotation direction adjustment intermediate gear 14. Since both rotate around the fixed gear 9, the gears 9, 11, 12, 14, and 10 mesh and rotate, and the outer rotating frame 8 is rotated by exactly 1/5 of a rotation per rotation of the inner cylindrical guide 3. I can do it.

Figures 2 A, B, C, D, and E show the situation in which the inner cylindrical guide 3 having an eccentric shaft rotates clockwise at rotational intervals of 45 degrees, and the gears 11, 12, 14
, and the relative position and rotational situation between the outer rotating frame 8 and the X-ray imaging table 1. In position A, the cassette attachment part 7 was close to the top plate of the X-ray imaging table 1; Figure 2 B, C, and D show the situation in which it is rotating away from the top plate.

Regarding the rotation of the inner cylindrical guide 3,
Figure 2 A with the cassette attachment part 7 at the X-ray imaging position
It is known to start from the position shown in the figure, gradually increase the speed, pass B in the figure, gradually reduce the rotational speed from the position C, that is, 1/2 rotation, and stop temporarily at the position E, that is, 1 rotation in the figure. It is necessary to control the speed using an electronically controlled electric motor or an elliptical gear.

The center of the fixed gear 9 is the center of the eccentric rotation shaft 4 of the inner cylindrical guide 3, but since the eccentric rotation shaft 4 rotates together with the inner cylindrical guide 3,
As shown in the figure), the fixed gear 9 is fixed to the column 2 with the eccentric rotating shaft 4 as its air center.

Therefore, the intermediate gear 11 having the rotating shaft 13 on the side surface of the inner cylindrical guide 3 that rotates together with the eccentric rotating shaft 4 rotates around the fixed gear 9 by the same distance due to the rotation of the inner cylindrical guide 3. It turns out.
Therefore, since the intermediate gear 11 is always meshed with the fixed gear 9, rotational force is applied by the rotation of the inner cylindrical guide 3. Since the intermediate gear 11 and the rotation ratio adjustment intermediate gear 12 share the same rotation shaft 13 and are bonded together, the intermediate gear 11 and the rotation ratio adjustment intermediate gear 12 rotate at the same time. The rotation shaft of the meshed intermediate gear 14 for adjusting the rotation direction is fixed to the side surface of the cylindrical guide 3 on the same inner side as the rotation shaft 13, so that the rotation direction can be adjusted by rotating the intermediate gear 12 for adjusting the rotation ratio. The rotational force is also transmitted to the intermediate gear 14. Further, since the outer rotating frame gear 10 is meshed with the rotational direction adjusting intermediate gear 14, the rotational force of the rotational direction adjusting intermediate gear 14 is also transmitted to the outer rotating frame gear 10.

Note that the intermediate gear 11 and rotation ratio adjusting intermediate gear 12 that are engaged with the fixed gear 9 due to the rotation of the inner cylindrical guide 3 rotate in the same direction as the rotation of the inner cylindrical guide 3. do. Furthermore, since the intermediate gear 14 for adjusting the rotation direction is meshed with the intermediate gear 12 for adjusting the rotation ratio, it rotates in the opposite direction. Therefore, the rotational direction adjusting intermediate gear 14 rotates in a direction opposite to the rotation of the inner cylindrical guide 3. Next, the outer rotating frame gear 10 meshed with the rotation direction adjusting intermediate gear 14 is
Since it is an inner gear with teeth facing in the direction of the rotation axis, it rotates in the same direction as the rotation direction adjusting intermediate gear 14, that is, in the opposite direction to the rotation of the inner cylindrical guide 3.

Therefore, one rotation of the cylindrical guide 3 can rotate the outer rotating frame 8 by 1/5 rotation.

(Effects of the invention) As described above, in the rotary X-ray cassette changer of the present invention, the eccentrically rotating inner cylindrical guide and the outer rotating frame are connected to the fixed gear, the intermediate gear, and the outer rotating frame gear. As a result, a large cassette that approaches the top plate of the radiographing table during X-ray imaging can be automatically retracted from the radiographing table and replaced at high speed and smoothly.

Furthermore, if the cassette mounting part of one long cassette is divided and the central part is used as the imaging surface, multiple small cassettes can be mounted there, and from the end of one X-ray imaging until the outer rotating frame rotates once. If you replace the cassette by pushing it out with a spring in between,
It is also possible to more than double the number of X-ray photographs taken in a series.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the embodiment, FIGS. 2A to 2F are explanatory diagrams showing the operation of the embodiment, and FIG. 3 is a sectional view showing the main mechanism. 1: X-ray imaging table, 2: Support column, 3: Cylindrical guide, 4: Eccentric rotating shaft, 5: Toothed belt, 6: Electric motor, 7', 7'', 7, 7''''': Cassette attachment part ,
8: outer rotating frame gear, 9: fixed gear, 10: outer rotating frame gear, 11, 12, 14: intermediate gear.

Claims (1)

[Scope of utility model registration request] Eccentric rotating shafts protruding from the left and right sides of the cylindrical guide are respectively supported by the left and right pillars, and the eccentric rotating shafts are rotatably driven by the power of an electric motor, etc., and three or more are installed on the outside of the cylindrical guide. An outer rotary frame provided with N X-ray cassette mounting portions is rotatably mounted, and a fixed gear concentric with the axis of the eccentric rotating shaft is fixed to the support column, and An outer rotating frame gear is fixedly installed, and a plurality of intermediate gears that rotate in mesh with the fixed gear and the outer rotating frame gear are attached to the side of the cylindrical guide, and when the cylindrical guide rotates once, the outer rotating frame A rotary X-ray cassette chain engine characterized in that the diameter and number of the fixed gear, intermediate gear, and outer rotating frame gear are set so as to rotate by 1/N.