JP3644611B2 - Casing for X-ray equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an X-ray apparatus casing that houses an X-ray apparatus including an X-ray tube.
[0002]
[Prior art]
An X-ray apparatus that analyzes the properties of various substances using X-rays generated from an X-ray tube has been widely known. Since the operator must not be exposed to x-rays, the x-ray tube and other x-ray optical elements are usually covered by a casing formed of a material that can shield the passage of x-rays. An X-ray tube usually has therein a cathode that emits electrons and an anti-cathode that the electrons collide with. When electrons collide with the counter-cathode, X-rays are emitted from the counter-cathode, and the emitted X-rays are taken out from an X-ray extraction window provided on the tube wall of the X-ray tube.
[0003]
Generally, an X-ray shutter for opening and closing the X-ray extraction window is provided. When the operator performs any work on the X-ray apparatus inside the casing, the X-ray shutter is closed by the X-ray shutter to prevent the X-ray from being emitted from the X-ray tube. Prevents operators from being exposed to X-rays. Moreover, a door is provided in the casing of the X-ray apparatus, and when the operator performs an operation on the X-ray apparatus, the casing door is opened to perform the operation. When the work is completed, the door is closed to prevent X-rays from leaking out of the casing, and X-rays are emitted from the X-ray tube under this state.
[0004]
[Problems to be solved by the invention]
Conventionally, in order to ensure safety when an operator opens a casing door, an X-ray apparatus is known in which opening / closing of a casing door and opening / closing of an X-ray shutter of an X-ray tube are interlocked. In such a case, an open / close interlock mechanism using an electric control system is known. Specifically, the sensor detects that the casing door has been opened, and operates the electromagnetic solenoid, motor, etc. based on the output signal of the sensor to move the X-ray shutter to close the X-ray tube. Close the window.
[0005]
However, in an interlocking mechanism using such an electric control system, when a failure occurs in the electric control system, the X-ray shutter may malfunction and the operator may be exposed to X-rays. Further, due to a failure of the electric control system, there is a possibility that a deviation occurs between the timing when the casing door is opened and the timing when the X-ray shutter is closed. The present invention has been made to solve the above problems, and an object of the present invention is to provide an X-ray apparatus casing capable of reliably closing an X-ray shutter without malfunction when the casing door is opened. To do.
[0006]
[Means for Solving the Problems]
To achieve the above object, an X-ray apparatus casing according to the present invention is an X-ray apparatus casing that houses an X-ray apparatus including an X-ray tube, and opens and closes an X-ray extraction window of the X-ray tube. An X-ray shutter, a door provided on the casing that opens and closes, and the door and the X-ray shutter so that the X-ray shutter is closed when the door is opened and the X-ray shutter is opened when the door is closed. And a shutter opening / closing means for mechanically connecting the two.
[0007]
According to this X-ray apparatus casing, the casing door and the X-ray shutter are mechanically connected rather than electrically, so that no malfunction occurs in the opening and closing of the X-ray shutter, and the opening of the casing door is prevented. It is possible to reliably prevent a deviation between the operation timing and the X-ray shutter closing operation timing. Furthermore, since the X-ray shutter opens and closes in response to the opening / closing operation itself of the casing door, it is not necessary to perform a special operation for opening and closing the X-ray shutter, and therefore the operability is very good.
[0008]
As the opening / closing operation of the casing door, opening / closing by sliding movement, opening / closing by rotational movement, and the like are conceivable. However, in order to make the shutter opening / closing means simple and stable, it is preferable to open / close by sliding movement rather than opening / closing by rotational movement. Further, as the opening / closing operation of the X-ray shutter, opening / closing by sliding movement, opening / closing by rotational movement, and the like can be considered. Further, the opening / closing by the rotational movement may be an opening / closing by a turning movement such as a door installed in a general house, or, as shown in FIG. 4, a through hole 21 for passing X-rays is provided. Alternatively, the X-ray shutter 19 itself may be opened and closed by rotating the shaft.
[0009]
The shutter opening / closing means is not limited to a specific configuration, but preferably has a configuration including a cam that moves integrally with the casing door, and a cam follower that rotates integrally with the X-ray shutter and contacts the cam. Can be adopted. In this case, the cam rotates the cam follower in the closing movement direction of the X-ray shutter in response to the opening movement of the casing door, and further moves the cam follower in the opening movement direction of the X-ray shutter in response to the closing movement of the casing door. It has a cam shape for rotational movement.
[0010]
When a cam is used as the shutter opening / closing means, the specific shape of the cam is not limited to a specific shape, but a grooved cam is preferable. When such a grooved cam is used, it is desirable to install an X-ray shielding member so as to cover the grooved cam in order to prevent leakage of X-rays from the grooved cam. In order to make the cam follower move smoothly, it is desirable to interpose a roller between the cam and the cam follower.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an X-ray apparatus using an X-ray apparatus casing according to the present invention, particularly an X-ray diffraction apparatus. This X-ray diffractometer includes an X-ray tube 1 including an X-ray source F that generates X-rays, a goniometer 2 that measures angles related to a sample to be measured and an X-ray detector, and a casing that stores them. 3. On the front surface of the casing 3, a door 4 having a handle 10 and an operation panel 5 are provided. The operation panel 5 includes a warning indicator lamp for notifying abnormality related to X-rays.
[0012]
The door 4 opens and closes the opening 7 of the casing 3 by sliding as indicated by an arrow AA ′. FIG. 2 shows a state in which the door 4 is opened in the direction of arrow A. In this state, the inside is exposed from the opening 7 of the casing 3. The goniometer 2 installed inside the casing 3 has a sample support 8 and a detector arm 9. A sample S to be measured is supported by a sample support base 8, and an X-ray detector 11 for detecting diffracted X-rays generated in the sample S is supported by a detector arm 9.
[0013]
As shown in FIG. 6, the X-ray source F included in the X-ray tube 1 includes a filament 12 as a cathode and an anti-cathode 13 opposed thereto. When the filament 12 is energized, the filament 12 generates heat and emits electrons. The emitted electrons collide with the counter cathode 13 at high speed, and X-rays are generated therefrom. The generated X-rays are taken out of the X-ray tube 1 through an X-ray extraction window 14 provided on the tube wall of the X-ray tube 1 as shown in FIG.
[0014]
An X-ray shutter 19 is embedded inside the X-ray tube wall at the X-ray extraction window 14. As shown in FIG. 4, the X-ray shutter 19 is formed in a cylindrical shape, and a through hole 21 for allowing X-rays to pass through is formed at a substantially central position. Further, the X-ray shutter 19 is provided with a rotation shaft 22, and in FIG. 5, the rotation shaft 22 is rotatably supported by a cylindrical bracket 23 embedded in the tube wall of the X-ray tube 1. When the through-hole 21 of the X-ray shutter 19 coincides with the X-ray extraction window 14 of the X-ray tube 1, the X-ray extraction window 14 is opened. At this time, X-rays generated by the X-ray source F are moved to the window. 14 is taken out to the outside. On the other hand, when the X-ray shutter 19 rotates and the through hole 21 is angularly displaced with respect to the X-ray extraction window 14 of the X-ray tube 1, the X-ray shutter 19 places the X-ray extraction window 14 in the closed state. It is burned.
[0015]
In FIG. 4, a notch 24 is formed at an appropriate position of the rotary shaft 22, and a sensor, for example, a micro switch 25 is disposed at a position where the notch 24 can be detected. Whether or not the through hole 21 of the X-ray shutter 19 coincides with the X-ray extraction window 14 depending on whether or not the micro switch 25 detects the notch 24, in other words, the X-ray extraction window 14 is opened. Whether it is in a state or a closed state is detected.
[0016]
In FIG. 5, a rotary arm 26 is fixed to the tip of the rotary shaft 22 of the X-ray shutter 19. A cam follower 27 is fixed to the tip of the rotating arm 26. The cam follower 27 has a roller 28 at its tip. As shown in FIG. 7, the rear end portion 27 a of the cam follower 27 is located in a notch portion 23 b formed in the disc-like base portion 23 a of the bracket 23. A tension spring 29 as an elastic biasing member is stretched between the cam follower 27 and the support pin 30 standing on the bracket base 23a.
[0017]
In FIG. 1, the door 4 that opens and closes the opening 7 of the casing 3 is formed of lightweight plastic. The reason why the lightweight plastic is used is that the door can be easily opened and closed and that the appearance is neatly organized. Then, a flat cam member 18 is fixed to the back surface of the door 4 via an intermediate fixture 17 as shown in FIG. As a method for fixing the intermediate fixture 17 and the cam member 18 and a method for fixing the intermediate fixture 17 and the door 4, any method such as screwing, welding, adhesion, or the like can be adopted. By fixing the cam member 18 and the door 4 using the intermediate fixture 17, an interval corresponding to the width of the intermediate fixture 17 is formed between them.
[0018]
A cam 31 formed as a groove-like long hole is provided at a position slightly above the center of the cam member 18. The grooved cam 31 includes a linear groove 31a extending in parallel with the door 4 opening / closing direction (AA ′ direction) and an inclined groove 31b inclined upward in the figure. Further, in order to shield the grooved cam 31 from the outside, a flat plate-like X-ray shielding member 32 is fixed to the cam member 18. Both the cam member 18 and the X-ray shielding member 32 are formed of a material that can prevent passage of X-rays, such as a steel plate.
[0019]
As shown in FIG. 1 and FIG. 2, a pair of upper and lower rails are provided on the front side inside the casing 3 by arranging a plurality of rollers 33 in a row. As shown in FIG. 3, these rollers 33 support the cam member 18 from above and below, thereby supporting the cam member 18 and the door 4 fixed thereto slidably in the direction of arrow AA ′.
[0020]
When the cam member 18 is mounted on the casing 3 while being supported by the roller 33, the tip roller 28 of the cam follower 27 gets into the grooved cam 31 as shown in FIGS. 5 and 6. When the cam follower 27 is pulled by the tension spring 29, the cam follower 27 moves until it hits either the upper end or the lower end of the notch 23b formed in the disk-like base 23a of the bracket 23. In these states, the X-ray shutter 19 is accurately Is positioned. Also, the roller 28 at the tip of the cam follower 27 is always under pressure on the upper side surface of the inclined groove 31b of the grooved cam 31 or the lower side surface of the linear groove 31a of the grooved cam 31 by the spring force of the spring 29. Contact. The state shown in FIG. 6 shows a state in which the cam member 18 and thus the door 4 closes the opening 7 of the casing 3, and in this state, the tip roller 28 of the cam follower 27 moves to the inclined groove 31 b of the grooved cam 31. Located within the groove width. The groove width of the grooved cam 31 is set to be slightly larger than the outer diameter of the cam follower roller 28. This is to provide play, i.e., a dimensional allowance in consideration of assembly errors.
[0021]
When the cam follower 27 is in this state, the rotating arm 26 that supports the cam follower 27 is in the upwardly inclined position. When the rotary arm 26 is in this position, the X-ray shutter 19 fixed to the rotary arm 26 via the rotary shaft 22 places the X-ray extraction window 14 of the X-ray tube 1 in an open state. That is, the X-ray passage hole 21 of the X-ray shutter 19 is placed at a position coincident with the X-ray extraction window 14. In this state, X-rays generated by the X-ray source F in the X-ray tube 1 are radiated to the outside of the X-ray tube 1 through the X-ray extraction window 14.
[0022]
When the door 4 is gradually opened in the arrow A direction from this state, the cam member 18 integrated with the door 4 also slides in the arrow A direction in FIG. Then, the cam follower 27 is gradually pushed downward by the inclined groove 31b moving in the direction of arrow A, whereby the rotary arm 26 rotates in the clockwise direction in FIG. 6, and at the same time, the X-ray shutter 19 rotates in the same direction. . When the door 4 and thus the cam member 18 continues to move, the cam follower 27 enters the linear groove 31a from the inclined groove 31b and further advances through the linear groove 31a.
[0023]
When the cam follower 27 enters the linear groove 31a, as shown in FIG. 7, the rotating arm 26 rotates from the upwardly inclined state to the downwardly inclined position, whereby the X-ray of the X-ray shutter 19 is rotated. The passage opening 21 is angularly disengaged from the X-ray extraction window 14 of the X-ray tube 1 and the window 14 is placed in a closed state. In this state, X-rays generated by the X-ray source F in the X-ray tube 1 are prevented from being emitted to the outside of the X-ray tube 1 through the X-ray extraction window 14. Since the linear groove 31a is parallel to the sliding direction (AA ′ direction) of the cam member 18, the cam follower 27 moves up and down by the linear groove 31a while the cam follower 27 advances in the linear groove 31a. The movement is restricted, and therefore the X-ray extraction window 14 of the X-ray shutter 19 is securely held closed without malfunctioning.
[0024]
As shown in FIG. 6, when the cam follower 27 is above the neutral position, the spring 29 presses the cam follower 27 against the upper side surface of the inclined groove 31b. On the other hand, when the cam follower 27 is below the neutral position as shown in FIG. 7, the spring 29 presses the cam follower 27 against the lower side surface of the linear groove 31a. The action of the spring 29 prevents vibration of the cam follower 27. As a result, the X-ray shutter 19 is held in a stable state in either the open state or the closed state.
[0025]
As shown in FIG. 5, when the door 4 closes the opening 7 of the casing 3, it is desirable that the door 4 cannot be easily opened. Therefore, in this embodiment, a magnet and a magnetic member are installed at appropriate positions of the door 4 and the casing 3, and when the door 4 is closed, the door 4 is magnetically attracted to the casing 3. Further, it is detected by a sensor, for example, a micro switch 34, that the door 4 is completely closed.
[0026]
The operation of the X-ray apparatus having the above configuration will be described below. First, as shown in FIG. 2, the operator mounts the sample S on the sample support 8 with the door 4 opened. At this time, as shown in FIG. 7, the cam member 18 integrated with the door 4 is slid in the direction of the arrow A, and the cam follower 27 is held in the linear groove 31a. 19 closes the X-ray extraction window 14. Therefore, X-rays do not leak from the X-ray tube 1, and the operator can work with confidence without being exposed to X-rays. Since the cam follower 27 is restricted from moving in the vertical direction by the linear groove 31a, as long as the cam follower 27 is in the linear groove 31a, the X-rays can be obtained regardless of the position of the cam member 18 and thus the door 4. The shutter 19 is accurately fixed and held in the closed state.
[0027]
When the mounting of the sample S is completed, the operator inserts a finger into the handle 10 of the door 4 in FIG. 2, slides the door 4 in the direction of arrow A ′, and closes the door 4 as shown in FIG. When the door 4 is closed, as shown in FIG. 7, the cam follower 27 is held in the linear groove 31a of the grooved cam 31 for a while, so that the X-ray shutter 19 is held in the closed state. Thereafter, when the door 4 approaches a position where the opening of the casing 3 is completely closed, the cam follower 27 enters the inclined groove 31b and is pushed upward by the inclined groove 31b. When the door 4 completely closes the casing opening 7, the cam follower 27 is pushed up to the upper position as shown in FIG. 6, thereby setting the X-ray shutter 19 in the open state. Thus, when the X-ray shutter 19 is opened, the cam member 18 and thus the door 4 are always closed due to the mechanical relationship between the grooved cam 31 and the cam follower 27. Is reliably prevented from leaking out, so that the operator will not be exposed.
[0028]
As described above, after the door 4 is closed and the X-ray extraction window 14 of the X-ray tube 1 is set to the open state, the operator instructs the start of measurement through the operation panel 5 (see FIG. 1). Then, in FIG. 5, X-rays are emitted from the X-ray source F in the X-ray tube 1, and the X-rays are extracted to the outside of the X-ray tube 1 through the X-ray shutter 19 placed in an open state. The extracted X-ray is applied to the sample S while its divergence is restricted by the divergence restriction slit 15. When Bragg diffraction conditions are satisfied between the irradiated X-rays and the crystal lattice plane of the sample S, diffracted X-rays are generated from the sample S, and the diffracted X-rays are focused on the light receiving slit 16 and pass through it. After that, it is detected by the X-ray detector 11. And the property of the sample S is analyzed based on this detection result.
[0029]
In FIG. 5, when the shutter-side micro switch 25 detects that the X-ray shutter 19 is in the open state, a warning is displayed on the operation panel 5. The operator who sees this is careful not to open the door 4. When the door-side microswitch 34 detects that the door 4 is not completely closed, a warning is displayed on the operation panel 5. An operator who sees this will note that the X-ray shutter is not open.
[0030]
Further, when the shutter-side microswitch 25 detects that the X-ray shutter 19 is in the open state, and at the same time, the door-side microswitch 34 detects that the door 4 is not completely closed, the X-ray tube 1 Generation of X-rays from the internal X-ray source F is stopped, thereby ensuring the safety of the operator. However, such an X-ray stop operation is an auxiliary operation for ensuring further safety. This is because if the opening and closing of the door 4 and the opening and closing of the X-ray shutter 19 are mechanically interlocked as in the present embodiment, the X-ray shutter 19 and the door 4 are simultaneously opened. Because there is no possibility. Therefore, the X-ray stopping operation can be omitted in some cases.
[0031]
Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to the embodiments and can be variously modified within the technical scope described in the claims.
For example, any X-ray tube and goniometer other than those shown in FIG. 2 can be adopted. Further, any X-ray apparatus other than the X-ray diffraction apparatus can be accommodated in the casing. The configuration of the shutter opening / closing means that mechanically connects the opening / closing of the door and the opening / closing of the X-ray shutter is not limited to the configuration shown in FIGS. 5 and 6, and other appropriate configurations may be employed. In addition, the opening / closing operation of the casing door may be a door-type opening / closing operation by turning movement instead of the opening / closing operation by sliding movement. However, in that case, it is necessary to appropriately change the configuration of the shutter opening / closing means.
[0032]
【The invention's effect】
According to the casing for an X-ray apparatus according to claim 1, since the casing door and the X-ray shutter are mechanically connected rather than electrically, no malfunction occurs in opening and closing the X-ray shutter. It is possible to reliably prevent a deviation from occurring between the timing of opening the casing door and the timing of closing the X-ray shutter. Furthermore, since the X-ray shutter opens and closes in response to the opening / closing operation itself of the casing door, it is not necessary to perform a special operation for opening and closing the X-ray shutter, and therefore the operability is very good.
[0033]
According to the casing for an X-ray apparatus according to claim 2, the shutter opening / closing means can be configured more simply and a stable opening / closing operation can be ensured as compared with a so-called door-type door that opens and closes by turning movement. it can. In addition, when a door-type door is used, when the door is opened, the door may come out in front of the casing, and there is a risk of interfering with various operations on the X-ray apparatus. On the other hand, if a sliding door is used, the door does not come out in front of the casing, and therefore, these operations are easy.
[0034]
According to the casing for the X-ray apparatus according to claim 3, compared with the case where the X-ray shutter is constituted by a slide type shutter, or compared with the case where the shutter opening / closing means is constituted by using a power transmission element other than the cam. Further, the configuration of the X-ray shutter and the shutter opening / closing means can be simplified, and the auxiliary mechanism around the X-ray tube can be formed in a small size.
[0035]
According to the casing for the X-ray apparatus according to the fourth aspect, the configuration of the X-ray shutter and the shutter opening / closing means can be further simplified as compared with the case where the X-ray shutter is constituted by a sliding shutter or a revolving shutter. In addition, the incidental mechanism around the X-ray tube can be made even smaller. Further, even when the opening / closing of the X-ray shutter and the opening / closing of the casing door are repeatedly performed over a long period of time, the operations of the X-ray shutter and the shutter opening / closing means are stable.
[0036]
According to the X-ray apparatus casing of the fifth aspect, the sliding movement of the door can be converted into the opening / closing movement of the X-ray shutter in an ideal manner. The ideal shape means that no wasteful space is required and that the casing door and the X-ray shutter can be opened and closed with very little force. Further, if the X-ray shutter is closed by the linear groove, the vertical movement of the cam follower is restricted by the linear groove while the door is slid. It can be held stably in the closed position. In addition, by restricting the vertical movement of the cam follower, the X-ray shutter will not move even if an external force is applied to the X-ray shutter or its accessory device for any reason, thus ensuring safety. Is done.
[0037]
According to the casing for an X-ray apparatus according to claim 6, even when the door is formed of a material that is light like plastic but transmits X-rays, X-rays leak out of the casing. Can be prevented.
[0038]
According to the casing for an X-ray apparatus according to the seventh aspect, the frictional force between the cam and the cam follower is reduced, and the casing door and the X-ray shutter are smoothly opened and closed with a small force.
[0039]
According to the X-ray apparatus casing of the eighth aspect, the X-ray shutter is securely fixed and held at either the closed position or the open position by the force of the elastic biasing member, thereby opening and closing the X-ray shutter. The operation can be repeated and performed stably.
[0040]
According to the casing for an X-ray apparatus according to claims 9 and 10, the support mechanism for the casing door can be formed as a simple and stable mechanism.
[0041]
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall shape of an X-ray apparatus using an X-ray apparatus casing according to the present invention, particularly an X-ray diffraction apparatus.
2 is a perspective view showing a state in which a casing door of the X-ray diffraction apparatus of FIG. 1 is opened. FIG.
FIG. 3 is an exploded perspective view showing a coupling state of a casing door and a cam member.
FIG. 4 is a perspective view showing an example of an X-ray shutter.
FIG. 5 is a plan sectional view showing the main part of the internal structure of the X-ray diffraction apparatus of FIG. 1;
6 is a front view of the portion shown in FIG. 5, and shows a case where an X-ray shutter is in an open state. FIG.
7 is a front view showing a case where the casing door is opened from the state shown in FIG. 6 and the X-ray shutter is closed. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 X-ray tube 2 Goniometer 3 Casing 4 Door 5 Operation panel 7 Casing opening 8 Sample support stand 9 Detector arm 10 Handle 11 X-ray detector 12 Filament 13 Cathode 14 X-ray extraction window 15 Divergence control slit 16 Light receiving slit 17 Intermediate fixture 18 Cam member 19 X-ray shutter 21 X-ray passing through hole 22 Rotating shaft 23 Bracket 23a Bracket disc base portion 23b Bracket notch portion 24 Rotating shaft notch 26 Rotating arm 27 Cam follower 28 Cam follower Roller 29 tension spring (elastic biasing means)
31 Cam 31a Linear groove 31b Inclined groove 32 X-ray shielding member 33 Roller (rail means)
F X-ray source S Sample

Claims (10)

In a casing for an X-ray apparatus that houses an X-ray apparatus provided with an X-ray tube,
An X-ray shutter that opens and closes an X-ray extraction window of the X-ray tube;
A door that is provided in the casing and that opens and closes;
X-ray shutter is closed when the door is opened, and a shutter opening / closing means for mechanically connecting the door and the X-ray shutter so as to open the X-ray shutter when the door is closed. Casing for wire device. The X-ray apparatus casing according to claim 1, wherein the door is opened and closed by sliding movement. The casing for an X-ray device according to claim 2,
The X-ray shutter rotates to open and close the X-ray extraction window, and the shutter opening and closing means includes a cam that moves integrally with the door, a cam follower that rotates and moves integrally with the X-ray shutter, and contacts the cam. Have
The cam rotates the cam follower in the closing movement direction of the X-ray shutter in response to the opening movement of the door, and further rotates the cam follower in the opening movement direction of the X-ray shutter in response to the closing movement of the door. A casing for an X-ray apparatus having a cam shape. 4. The casing for an X-ray device according to claim 3, wherein the X-ray shutter is formed in a cylindrical shape, further has a through-hole for passing X-rays, and further rotates around the central axis of the cylinder. An X-ray apparatus casing which opens and closes an X-ray extraction window. 5. The casing for an X-ray apparatus according to claim 3, wherein the cam includes a linear groove for holding the cam follower at the closed position of the X-ray shutter, and the cam follower from the closed position of the X-ray shutter to the open position. A casing for an X-ray apparatus, wherein the casing is a grooved cam formed by an inclined groove for rotationally moving to the right. 6. The casing for an X-ray apparatus according to claim 5, wherein an X-ray shielding member is disposed between the grooved cam and the door. The casing for an X-ray apparatus according to claim 5, wherein the cam follower has a roller at a contact portion with the cam. The casing for the X-ray device according to any one of claims 5 to 7, wherein the cam follower is elastically pulled to either the open position side or the closed position side of the X-ray shutter with the neutral position as a boundary. A casing for an X-ray apparatus, comprising a force member. In the casing for X-ray apparatuses as described in any one of Claims 5-8,
A flat cam member fixed to the back surface of the door and disposed inside the casing; and rail means for supporting the cam member in a slidable manner. A casing for an X-ray apparatus, wherein 10. The casing for an X-ray apparatus according to claim 9, wherein the rail means is constituted by a plurality of rollers arranged on a linear locus.

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