JP6743935B2 - Stopping device for moving member in X-ray imaging apparatus - Google Patents

Description

The present invention relates to a moving member stop device for stopping a moving member that reciprocates in an X-ray imaging apparatus at a set position.

In an X-ray imaging apparatus for rounds, which moves between patient rooms to perform X-ray imaging, a guide rail is provided on a support column that is erected on a carriage equipped with wheels, and an arm that supports an X-ray tube is provided at the tip. This guide member is used so that it can be moved up and down along the support column (see Patent Document 1).

Further, in an X-ray imaging apparatus for performing chest X-ray imaging for a subject in a standing position, a bucky portion supporting an X-ray detection unit such as a film cassette is provided on a stand vertically installed. It is configured to be able to move up and down along a guide rail (see Patent Document 2).

As described above, in the configuration in which the moving member such as the arm or the bucky portion that supports the X-ray tube or the X-ray detecting unit is reciprocally moved along the guide rail, a plurality of rollers such as bearings are provided for the moving member. Then, the roller rolls in the guide rail to reciprocate the moving member along the guide rail. The guide rail is provided with a stopper for stopping the moving member at the end of its moving stroke. As such a stopper, conventionally, a bolt or the like provided at the end of the moving path of the moving member on the guide rail has been used.

JP, 2008-259881, A JP, 2005-21233, A

The stopper for stopping the movement of the moving member is required to have some strength. Therefore, a predetermined area is required to install such a stopper, and there is a problem that the movement stroke of the moving member is limited by the area occupied by the stopper. Further, when the moving member stops due to the action of the stopper at the end of the moving stroke of the moving member, the roller of the moving member collides with the stopper, so that the moving member may suddenly stop depending on the moving speed of the moving member. Not only does this cause an impact, but there is a problem that the rollers and the stopper may be damaged due to the collision between the roller and the stopper.

The present invention has been made to solve the above problems, and provides a stopping member for a moving member in an X-ray imaging apparatus capable of smoothly stopping the moving member without impacting the rollers. To aim.

The invention according to claim 1 is a moving member stop device for stopping a moving member that reciprocates with a fixed member as a reference in a set position in an X-ray imaging apparatus, and has guide surfaces that are arranged to face each other. A guide rail and a roller that is connected to the fixed member or the moving member and rolls along the guide rail, and in the region of the moving member at the stop position side, between the guide surfaces arranged opposite to each other. The distance is gradually reduced from a distance larger than the outer diameter of the roller to a distance smaller than the outer diameter of the roller.

According to a second aspect of the present invention, in the first aspect of the present invention, the guide rail has a pair of groove portions that face each other, and a thin plate that forms the guide surface in each of the pair of groove portions. In the region near the edge of the thin plate member, the distance between the pair of thin plate members is larger than the outer diameter of the roller to a distance smaller than the outer diameter of the roller. A bending member that bends at least one of the thin plate members is provided so as to become gradually smaller.

In the invention according to claim 3, in the invention according to claim 2, the bending member attaches an end portion of one thin plate member of the pair of thin plate members in a direction of the other thin plate member. Consists of a force screw.

The invention according to claim 4 is the invention according to claim 2, wherein the bending member is disposed between an end portion of one thin plate member of the pair of thin plate members and the groove portion. Composed of wedge-shaped members.

The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the moving member supports an X-ray tube and reciprocates the X-ray tube along the guide rail. It is an arm to let.

According to a sixth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the moving member supports an X-ray detecting section inside, and the X-ray detecting section is provided along a guide member. It is a bucky part that moves back and forth.

According to the invention of claim 1, the distance between the pair of guide surfaces is gradually reduced from a distance larger than the outer diameter of the roller to a distance smaller than the outer diameter of the roller, so that the roller is not impacted, It is possible to smoothly stop the moving member.

According to the invention of claims 2 to 4, by curving the thin plate member, the distance between the thin plate members is gradually reduced from a distance larger than the outer diameter of the roller to a distance smaller than the outer diameter of the roller. The configuration can be realized with a simple structure. For this reason, it is possible to smoothly stop the moving member without impacting the rollers with a simple configuration.

According to the fifth aspect of the invention, it is possible to safely move and stop the arm that supports the X-ray tube.

According to the invention described in claim 6, it is possible to safely move and stop the bucky portion supporting the X-ray detector.

It is an outline side view of an X-ray imaging apparatus to which the stopping device for a moving member according to the present invention is applied. It is a perspective view of an X-ray imaging apparatus to which the stopping device for a moving member according to the present invention is applied. It is an exploded perspective view showing the important section of the stop device of the moving member in the X-ray imaging system concerning this invention. It is a top view showing the important section of the stop device of the moving member in the X-ray imaging system concerning this invention. FIG. 9 is a partial perspective view showing a state in which the thin plate member 44 is curved in the moving member stopping device in the X-ray imaging apparatus according to the present invention. FIG. 11 is a front view showing a state in which the thin plate member 44 is curved in the moving member stopping device in the X-ray imaging apparatus according to the present invention. It is a front view which shows a mode that the thin plate-shaped member 44 is curved in the stop device of the moving member in the X-ray imaging apparatus which concerns on 2nd Embodiment of this invention. It is a front view which shows the principal part of the stop device of the moving member in the X-ray imaging apparatus which concerns on 3rd Embodiment of this invention. FIG. 9 is a perspective view of a standing radiography stand in an X-ray radiographing apparatus to which the moving member stopping device according to the present invention is applied.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of an X-ray imaging apparatus to which a moving member stopping device according to the present invention is applied. Further, FIG. 2 is a perspective view of an X-ray imaging apparatus to which the moving member stopping apparatus according to the present invention is applied.

This X-ray imaging apparatus is a round-trip X-ray imaging apparatus that moves between hospital rooms and executes X-ray imaging in each hospital room. This X-ray imaging apparatus includes a column 14 provided on a carriage 15, an arm 13 as a moving member according to the present invention, which is provided in a state capable of moving up and down with respect to a guide rail 41 of the column 14, and an arm 13. X-ray tube 11 provided at the tip of the X-ray tube, a collimator 12 provided below the X-ray tube 11, and an X-ray for detecting X-rays emitted from the X-ray tube 11 and passing through the subject. The X-ray detector 16 and a storage unit 17 for storing the X-ray detector 16 are provided. Further, this X-ray imaging apparatus includes a pair of left and right front wheels 21 which are wheels for changing directions, a pair of left and right rear wheels 22 which are wheels for driving, and an operation handle 19 for operating the traveling direction of the carriage 15. With.

The arm 13 can take a fixed posture when moving the carriage 15 shown by a solid line in FIG. 1 and a photographing posture for performing X-ray photographing shown in FIG. When the arm 13 is in the fixed posture, the lower surface of the arm 13 contacts a fixed portion 18 called an arm catch. In this state, the pin 23 arranged on the lower surface of the arm 13 is housed in the hole (not shown) formed in the fixing portion 18. Further, the arm 13 ascends from the fixed posture as shown by an imaginary line in FIG. 1, and then swivels around the column 14 as shown in FIG. The arm 13 can move up and down between a maximum height shown by a phantom line in FIG. 1 and a solid line in FIG. 2 and a minimum height lower than the fixed posture shown by the solid line in FIG.

On the front surface of the collimator 12, a pair of dials 33 for opening and closing the collimator leaf and a button 34 for turning on a collimator lamp used for confirming the X-ray irradiation field are arranged. Further, the collimator 12 is provided with a handle 31 used when moving the X-ray tube 11 and the collimator 12. The handle 31 is provided with a pair of release buttons 32 for releasing the fixation of the arm 13 by the fixing mechanism that prohibits the arm 13 from moving up and down and turning. When the release button 32 is not pressed, the arm 13 is fixed to the column 14 by a permanent electromagnet mechanism that is a combination of an electromagnet and a permanent magnet, and stops in that position.

Further, the arm 13 is configured to be stopped by the moving member stopping device according to the present invention at the upper end position and the lower end position of the lifting stroke with respect to the guide rail 41 in the support column 14.

Next, the structure of the moving member stopping device in the X-ray imaging apparatus according to the present invention will be described. FIG. 3 is an exploded perspective view showing a main part of a moving member stopping device in the X-ray imaging apparatus according to the present invention. FIG. 4 is a plan view showing a main part of a moving member stopping device in the X-ray imaging apparatus according to the present invention. FIG. 5 is a partial perspective view showing how the thin plate member 44 is curved in the moving member stopping device in the X-ray imaging apparatus according to the present invention. Further, FIG. 6 is a front view showing a state in which the thin plate member 44 is curved in the stopping device for the moving member in the X-ray imaging apparatus according to the present invention.

The moving member stopping device in the X-ray imaging apparatus according to the present invention includes a moving body 51. As shown in FIG. 4, the moving body 51 is fixed to an arm 13 as a moving member that supports and moves the X-ray tube 11. Four bearings 52 functioning as wheels are rotatably attached to the moving body 51 via a support shaft 53. These bearings 52 form a roller according to the present invention. Instead of the bearing 52, a roller having another structure may be used.

The moving body 51 is guided by a guide rail 41 that constitutes a part of the support column 14 and moves up and down together with the arm 13. Two pairs of groove portions 42 (see FIG. 3) facing each other are formed on the guide rail 41. In the groove 42, thin plate-like members 43 and 44, which form guide surfaces for guiding the bearings 52 of the moving body 51, are arranged. The guide rail 41 described above is made of, for example, an extruded material of aluminum. On the other hand, the thin plate members 43 and 44 are made of iron leaf springs or the like. Accordingly, even when the outer peripheral surface of the bearing 52 is made of metal, the durability of the guide rail 41 can be improved.

As shown in FIGS. 3 and 5, a screw hole 58 penetrating the guide rail 41 is formed in the upper portion of the guide rail 41. A screw 59 can be screwed into the screw hole 58. The tip end of the screw 59 penetrates the guide rail 41 and contacts the surface of the thin plate member 44 on the opposite side of the contact surface of the bearing 52. Then, by adjusting the position of the screw 59, the thin plate member 44 can be biased by the screw 59 in the direction of the thin plate member 43, whereby the thin plate member 44 is moved in the direction of the thin plate member 43. Can be curved towards. Note that, as shown in FIGS. 3 and 5, in the groove portion 42 of the pair of groove portions 42 in which the screw holes 58 are formed, the inwardly projecting portion is deleted in the upper end region, so that the thin plate member 44 is formed. Prevents interference during bending.

As shown in FIG. 6, the distance between the contact surface of the thin plate member 43 with the bearing 52 and the contact surface of the thin plate member 44 with the bearing 52 is about the outside of the bearing near the center of the guide rail 41. The distance is slightly larger than the diameter D1. On the other hand, as shown in FIG. 5, the thin plate member 44 is biased toward the thin plate member 43 by the action of the screw 59 to bend the thin plate member 44, and the thin plate member 44 is moved to the thin plate member 44. By setting a distance d from the contact position between the guide rail 41 and the guide rail 41, as shown in FIG. 6, the contact surface of the thin plate member 43 with the bearing 52 and the contact surface of the thin plate member 44 with the bearing 52. The distance D2 to the contact surface can be made slightly smaller than the outer diameter D1 of the bearing.

In the X-ray imaging apparatus having the moving member stopping device having the above-described configuration, when the X-ray tube 11 and the collimator 12 are moved up and down together with the arm 13, the operator presses the release button 32 as described above. With the arm 13 fixed to the column 14, the handle 31 is gripped and the arm 13 is moved up and down along the guide rail 41 of the column 14. At this time, the pair of lower bearings 52 of the moving body 51 abut on the surface of the thin plate member 43 and rotate as shown in FIG. Further, the pair of upper bearings 52 of the moving body 51 abuts on the surface of the thin plate member 44 and rotates.

In this state, when the moving body 51 approaches the stop position near the upper end of the moving stroke, the contact surface of the thin plate member 43 with the bearing 52 and the contact surface of the thin plate member 44 with the bearing 52. Since the distance between and is gradually smaller than the outer diameter D1 of the bearing 52, the upper bearing of the moving body 51 is sandwiched between the surface of the thin plate member 43 and the surface of the thin plate member 44, and the moving body 51 The resistance to the movement of the vehicle gradually increases, and eventually the moving body 51 stops.

As described above, according to the stopping device for the moving member in the X-ray imaging apparatus according to the present invention, the distance between the contact surface of the thin plate member 43 with the bearing 52 and the contact surface of the thin plate member 44 with the bearing 52. However, since the outer diameter D1 of the bearing 52 is gradually reduced, the moving resistance increases as the moving body 51 approaches the end of the moving stroke. Therefore, the operator can easily recognize that the arm 13 has approached the end of the moving stroke. Then, the moving body 51 gradually decreases its speed by the action of the thin plate-like members 43 and 44 that sandwich the bearing 52, and stops slowly. Therefore, unlike the related art, when the movement of the moving body 51 is stopped, the impact due to the collision with the stopper or the like does not occur.

In the above description, the upper end of the moving stroke of the moving body 51 has been described, but the same configuration as above is adopted at the lower end of the moving stroke of the moving body 51. At the lower end of the stroke, it is possible to gradually decelerate and smoothly stop.

Next, another embodiment of the present invention will be described. FIG. 7 is a front view showing a state in which the thin plate member 44 is curved in the moving member stopping device in the X-ray imaging apparatus according to the second embodiment of the present invention. The same members as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the above-described first embodiment, the thin plate member 44 is curved by the action of the screw 59, so that the thin plate member 43 comes into contact with the bearing 52 and the thin plate member 44 comes into contact with the bearing 52. Is gradually reduced to a distance D2 slightly smaller than the outer diameter D1 of the bearing. On the other hand, in the stopping device for the moving member in the X-ray imaging apparatus according to the second embodiment, the wedge member 45 is provided between the end of the thin plate member 44 and the bottom surface of the groove 42 of the guide rail 41. It is arranged. The wedge-shaped member 45 is fixed to the guide rail 41 by the action of the set screw 46. That is, in the second embodiment, by bending the thin plate member 44 by the action of the wedge member 45, the contact surface between the thin plate member 43 and the bearing 52 contacts the bearing 52 of the thin plate member 44. The distance to the contact surface is gradually reduced to a distance D2 slightly smaller than the outer diameter D1 of the bearing.

Even when such a configuration is adopted, the moving body 51 is gradually decelerated at the end of the moving stroke of the moving body 51 at the end of the moving stroke, as in the case of the first embodiment described above. It becomes possible to make it stop smoothly.

Next, still another embodiment of the present invention will be described. FIG. 8 is a front view showing the main part of the moving member stopping device in the X-ray imaging apparatus according to the third embodiment of the present invention. The same members as those in the first and second embodiments described above are designated by the same reference numerals, and detailed description thereof will be omitted.

In the above-described first and second embodiments, by bending the thin plate member 44, the distance between the contact surface of the thin plate member 43 with the bearing 52 and the contact surface of the thin plate member 44 with the bearing 52. Is gradually reduced to a distance D2 slightly smaller than the outer diameter D1 of the ring. On the other hand, in the third embodiment, the thin plate members 43 and 44 are omitted. In the third embodiment, the wedge-shaped member 47 is attached near the upper end of the guide rail 41 by the set screw 48 so that the distance between the guide surfaces that abut on the bearing 52 is smaller than the outer diameter D1 of the bearing 52. The distance D2 is slightly smaller.

Even when such a configuration is adopted, it becomes possible to gradually reduce the speed of the moving body 51 and slowly stop the moving body 51. In the case of adopting such a configuration, the outer peripheral portion of the bearing 52 is made of resin or the like to prevent the guide rail 41 and the wedge-shaped member 47 from being damaged even when the moving body 51 repeatedly moves up and down. Preferably.

Next, another X-ray imaging apparatus to which the moving member stopping apparatus according to the present invention is applied will be described. FIG. 9 is a perspective view of an upright imaging stand in an X-ray imaging apparatus to which the moving member stopping device according to the present invention is applied.

This upright photographing stand is provided with a bucky unit 63 that supports an X-ray detection unit such as a film cassette or a flat panel detector in a state of being housed inside. The bucky portion 63 can be moved up and down by being guided by the guide rails 41 of the columns 61 standing on the base 62. The bucky portion 63 is connected to the moving body 51 similar to the above-described embodiments.

When performing X-ray imaging by an X-ray imaging apparatus using this standing radiography stand, the subject stands upright in front of the standing radiography stand. Then, X-rays are emitted from an X-ray tube (not shown) toward the subject, and the X-rays passing through the subject are detected by the X-ray detector stored in the bucky portion 63.

Also in the X-ray imaging apparatus having such a configuration, by adopting the moving member stop device similar to that in each of the above-described embodiments, the bucky portion 63 is provided at the end of the lifting stroke of the bucky portion 63 as the moving member. It is possible to gradually reduce the ascending/descending speed of the and to stop the bucky portion 63 slowly.

Note that, as in the above-described embodiments, the moving member according to the present invention is not limited to the one that supports the X-ray tube 11 and the one that supports the bucky part 63 including the X-ray detector. For example, the present invention may be applied to various moving members that reciprocate along a guide rail in an X-ray imaging apparatus, such as a moving member that horizontally reciprocates while supporting a medical examination table on which a subject is placed. Can be applied.

Further, in the above-described embodiment, the bearing 52 as a roller is provided on the moving body 51 that moves with respect to the support columns 14 and 61 as a fixing member. The rail may be arranged on the moving member side.

11 X-ray tube 12 Collimator 13 Arm 14 Strut 15 Carriage 16 X-ray detector 17 Storage part 18 Fixed part 21 Front wheel 22 Rear wheel 32 Release button 41 Guide rail 42 Groove part 43 Thin plate member 44 Thin plate member 45 Wedge member 46 Stop Screw 47 Wedge-shaped member 48 Set screw 51 Moving body 52 Bearing 53 Spindle 58 Screw hole 59 Screw 61 Post 62 Base stand 63 Bucky part

Claims (6)

A moving member stop device for stopping a moving member, which reciprocates with a fixed member as a reference in an X-ray imaging apparatus, at a set position,
A guide rail having guide surfaces arranged to face each other,
A roller that is connected to the fixed member or the movable member and rolls along the guide rail,
Equipped with
In the region of the moving member on the stop position side, the distance between the guide surfaces arranged opposite to each other is gradually reduced from a distance larger than the outer diameter of the roller to a distance smaller than the outer diameter of the roller. A stopping device for a moving member in an X-ray imaging apparatus. The stopping device for the moving member in the X-ray imaging apparatus according to claim 1,
The guide rail has a pair of groove portions facing each other, and in each of the pair of groove portions, a thin plate member that forms the guide surface is disposed,
In the region near the edge of the thin plate member, the thin plate member is configured such that the distance between the pair of thin plate members gradually decreases from a distance larger than the outer diameter of the roller to a distance smaller than the outer diameter of the roller. Of a moving member in an X-ray imaging apparatus, which is provided with a bending member that bends at least one of the linear members. The stopping device for the moving member in the X-ray imaging apparatus according to claim 2,
The bending member includes a screw that urges one end of one thin plate member of the pair of thin plate members toward the other thin plate member. apparatus. The stopping device for the moving member in the X-ray imaging apparatus according to claim 2,
The moving member stop device in an X-ray imaging apparatus, wherein the bending member is formed of a wedge-shaped member disposed between an end of one thin plate member of the pair of thin plate members and the groove. .. The stopping device for the moving member in the X-ray imaging apparatus according to claim 1,
The moving member is an arm that supports the X-ray tube and reciprocates the X-ray tube along the guide rail . The stopping device for the moving member in the X-ray imaging apparatus according to claim 1,
The moving member is a bucky unit that supports the X-ray detection unit therein and reciprocates the X-ray detection unit along a guide rail.

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