JPS6348248Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tomography apparatus. More specifically, the present invention relates to a tomography apparatus having an imaging mechanism for imaging a tomographic plane of a subject, and a mechanism for adjusting the tension of a power transmission means for transmitting rotational power in order to rotate the circumference of the subject in response to imaging. It is something.

FIG. 1 is a diagram showing a conventional configuration example of this type of tomography apparatus, and FIG. 2 is a diagram showing the configuration of the main part of FIG. 1.

In these figures, 10 is a subject, 20 is a rotating member, 30 is a main body, 40 is an imaging mechanism, 50 is a rotating member driving mechanism, 60 is a power transmission means such as a belt, and 70 is a tension adjustment mechanism.

The rotating member 20 has a through hole 21 into which the subject 10 is inserted during tomographic imaging, and a power transmission means winding portion, such as a toothed pulley 22, is provided on the outer periphery. The main body 30 supports the rotary member 20 rotatably in the A-A' direction. The photographing mechanism 40 is attached to the rotating member 20. In the imaging mechanism 40, 41 is an X-ray tube, which irradiates the subject 10 with X-rays during tomographic imaging. Reference numeral 42 denotes a detector which detects data signals of X-rays that have passed through the subject 10 and sends them to an imaging unit (not shown) that performs imaging of tomographic planes based on the data signals. The X-ray tube 41 and the detector 42 are used to detect the subject 10 during tomographic imaging.
They are arranged to face each other in the diametrical direction of the through hole 21 so as to sandwich the two holes in between. In the rotating member drive mechanism 50, 51
is a power generating part, such as a drive pulley, and the outer periphery is toothed. The drive pulley 51 is rotationally driven by a motor 52. Teeth 61 are formed on one side of the belt 60. The belt 60 is wound around the belt 60 with its teeth 61 meshing with the pulley 22 of the rotating member 20 and the drive pulley 51 of the rotating member drive mechanism 50. The weight of the rotating member drive mechanism 50 is supported by a belt 60. In the tension adjustment mechanism 70, 71 is a drive mechanism mounting plate, to which the rotating member drive mechanism 50 is attached, and one end 72 is fixed to the main body 30. 73
A screw holding member is provided with a screw hole 74 and is fixed to a free end 75 of the drive mechanism mounting plate 71. 76 is a tension adjustment screw, and screw hole 7
4 is screwed together. The tip 77 of the threaded part of the tension adjustment screw 76 has a hole 78 deep to the middle of the threaded part.
is provided. 79 is a link mechanism. In the link mechanism 79, 80 is a rod and is attached to the main body 30. Reference numeral 81 denotes an arm, which is attached to the rod 80 and rotates around a shaft 82 provided on the drive mechanism mounting plate 71.
It can be rotated in the B′ direction. 83 is a spring mounting shaft, one end of which is inserted into the hole 78, and the other end of which is attached to the arm 81. 84 is a compression coil spring, and the tip 7 of the threaded portion of the tension adjustment screw 76
7 and arm 81, and is attached to a spring attachment shaft 83. Compression coil spring 8
4 is pressing the arm 81.

In the tomography apparatus having such a configuration, when the subject 10 is inserted into the through hole 21, the X-ray tube 41
The detector 42 photographs a tomographic plane of the subject 10, and in response to this, the rotating member drive mechanism 50 causes the X-ray tube 41 and the detector 42 to rotate around the subject 10 in the A-A' direction.

Furthermore, although tension is applied to the belt 60 by the weight of the rotating member drive mechanism 50, this tension alone is insufficient, so tension is applied to the belt 60 in the following manner. The compression coil spring 84 presses the arm 81 with its spring force, so that a rotational force in the B direction is applied to the arm 81, and the rod 80 is pulled in the C direction. By this,
The drive mechanism mounting plate 71 is pulled in the C' direction toward the main body 30 (at this time, the free end 75 is slightly displaced in the C' direction), and tension is applied to the belt 60.

Such tension adjustment is performed as follows. When the tension adjustment screw 76 is rotated and moved in the D direction, the length of the compression coil spring 84 is shortened.
The spring force pressing against arm 81 increases. This allows the rod 80 of the link mechanism 79 to
The force pulling the belt 60 in the C direction increases, and the belt 60
The tension applied to it also increases. On the other hand, when the tension adjustment screw 76 is rotated and moved in the D' direction, the length of the compression coil spring 84 becomes longer, and the arm 81
The spring force that presses on becomes smaller. This causes the rod 80 of the link mechanism 79 to move the main body 30 to C.
The tension force in the direction becomes smaller, and the tension applied to the belt 60 also becomes smaller.

However, in such a tomography apparatus, since the spring force of the compression coil spring 84 is transmitted via the link mechanism 79, the rod 80 and the arm 8
1. Since the shaft 82 and the like are required, there are problems in that the number of parts of the device is large, the structure is complicated, and it is expensive.

The present invention has been made in order to eliminate the above-mentioned problems, and provides a tomography apparatus that is inexpensive, has a small number of parts, and has a simple configuration, and is capable of adjusting the tension applied to the power transmission means. It is intended for this purpose.

FIG. 3 is a diagram showing the configuration of an embodiment of a tomography apparatus according to the present invention. FIG. 4 is a diagram showing the configuration of the main part of FIG. 3. Figures 3 and 4
In the figures, the same parts as in FIGS. 1 and 2 are given the same reference numerals.

In these figures, 90 is a tension adjustment mechanism.

In the tension adjustment mechanism 90, 91 is a drive mechanism mounting plate to which the rotating member drive mechanism 50 is attached, and one end 92 is fixed to the main body 30. 93 is an angle formed in an L shape,
It is fixed integrally with the main body 30, and one arm is provided with a screw hole 94. 95 is a tension adjustment screw, which is screwed into the screw hole 94. A hole 97 is provided at the tip 96 of the threaded portion of the tension adjustment screw 95 and has a depth halfway up the threaded portion. Reference numeral 98 designates a tension generating means mounting shaft, for example, a spring mounting shaft, one end of which is inserted into the hole 97, and the other end of which is attached to the free end 99 of the drive mechanism mounting plate 91 so as to be able to be slightly displaced in the axial direction. Reference numeral 100 denotes a tension generating means, such as a compression coil spring, which is disposed between the threaded end 96 of the tension adjusting screw 95 and the free end 99 of the drive mechanism mounting plate 91, and is attached to the spring mounting shaft 98. The compression coil spring 100 presses the free end 99 of the drive mechanism mounting plate 91 in the E direction. 10
A fixing nut 1 is screwed onto the tension adjustment screw 95, and fixes the rotational position of the tension adjustment screw 95 through a double nut effect with the angle 93.

In a tomography apparatus having such a configuration, the first
Similarly to the tomography apparatus shown in the figure, the X-ray tube 41 and detector 42 are rotated around the subject 10 in the direction AA'.

Further, although tension is applied to the belt 60 by the weight of the rotating member drive mechanism 50, this tension alone is insufficient, so tension is applied to the belt 60 in the following manner. The compression coil spring 100 presses the free end 99 of the drive mechanism mounting plate 91 in the E direction (at this time, the free end 9
9 is slightly displaced in the E direction), thereby applying tension to the belt 60. Such tension adjustment is performed as follows. When the tension adjustment screw 95 is rotated and moved in the F direction, the length of the compression coil spring 100 is shortened, and the free end 99
The spring force that presses in the E direction increases. This increases the tension applied to the belt 60. On the other hand, when the tension adjustment screw 95 is rotated and moved in the F' direction, the length of the compression coil spring 100 becomes longer, and the spring force that presses the free end 99 in the E direction decreases. This reduces the tension applied to belt 60. After the belt 60 is adjusted to an appropriate tension in this manner, the rotational position of the tension adjusting screw 95 is fixed by the fixing nut 101.

According to the tomography apparatus having such a configuration, the belt 60 is controlled by the compression coil spring 100 that directly presses the free end 99 of the drive mechanism mounting plate 91 and the tension adjustment screw 95 that presses one end of the compression coil spring 100. The tension applied is adjusted. This results in
Since the link mechanism 79 used in the tomography apparatus shown in FIG. 1 is not required, the tension applied to the belt 60 can be adjusted at low cost and with a small number of parts and a simple configuration.

In addition, in the embodiment, the case where the power transmission means 60 is a belt has been described, but the power transmission means 60
may be other than this, such as a chain.

Further, in the embodiment, a case has been described in which the power transmission means winding part 22 and the power generation part 51 are geared pulleys, but the power transmission means winding part 22 and the power generation part 51 are other than this, for example. It may also be a friction wheel or the like.

Further, in the embodiment, a case has been described in which the tension generating means 100 is a compression coil spring, but the tension generating means 100 may be other than this, such as a compressed air spring.

As explained above, according to the present invention, it is possible to provide a tomography apparatus that is inexpensive, has a small number of parts, and has a simple configuration, and is capable of adjusting the tension applied to the power transmission means.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional configuration example of a tomography apparatus, FIG. 2 is a diagram showing the configuration of the main part of FIG. 1, and FIG. 3 is an example of an embodiment of the tomography apparatus according to the present invention. FIG. 4 is a diagram showing the configuration of the main part of FIG. 3. 10... Subject, 20... Rotating member, 22...
Power transmission means winding portion, 30...Main body, 40...Photographing mechanism, 50...Rotating member drive mechanism, 51...Power generation section, 90...Tension adjustment mechanism, 91...Drive mechanism mounting plate, 92... ...One end, 94...Screw hole, 9
5...Tension adjustment screw, 99...Free end, 100...
...Tension generating means.

Claims (1)

[Scope of utility model registration request] a rotating member to which a photographing mechanism for photographing a tomographic plane of a subject is attached; a rotating member drive mechanism that rotationally drives the rotary member to cause the photographing mechanism to rotate around the subject in accordance with photographing the tomographic plane; a power transmission means that is wound around the power generation section of the rotational member drive mechanism and the power transmission means winding section of the rotational member and transmits the power of the rotational member drive mechanism to the rotational member; and a power transmission means that is capable of rotating the rotational member. a drive mechanism mounting plate having one end fixed to a supporting body and to which the rotary member drive mechanism is attached; a tension adjustment screw screwed into a screw hole provided in the main body; a free end of the drive mechanism mounting plate; The present invention is characterized by comprising a tension generating means disposed between the tension adjusting screw and applying a pressing force to the free end of the drive mechanism mounting plate according to the position of the tension adjusting screw to apply tension to the power transmission means. Tomography device.