JPS63117731A - Entire jaw x-ray imaging apparatus also used as head part standard x-ray imaging - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a full jaw X-ray photography (panoramic X-ray photography) device that also performs head standard x#I photography (so-called cephalometric photography). The present invention relates to a full-jaw X-ray imaging apparatus that is equipped with a mechanism that allows the ray generator to be easily switched to an appropriate angle for both types of imaging, and at the same time allows the arm to rotate and stand still.

(Prior Art) Recently, X-ray imaging apparatuses that are capable of performing cephalometric imaging and panoramic imaging with a single unit have come to be used in fields such as dental treatment. Such an XG imaging device generally includes a support, an arm support fixed to the support, a horizontal rotating arm supported by the support, an angle switching mechanism at one end of the arm, and a support shaft for adjusting the irradiation angle. X supported to enable switching of
It consists of a line generator and a head fixation device for head standard photography, which is spaced apart from the support.When used for panoramic photography, it is attached to a film cassette holder provided at the other end of the arm, and for cephalometric photography. When used, the angle of the X-ray generator is changed and adjusted each time to the head fixed device for cephalometric imaging so that the irradiation direction of The panoramic film set holder and head fixing device are set so as not to obstruct the X-ray axis from the X-ray generator.

(Problems to be Solved by the Invention) The procedure for switching between panoramic imaging and cephalometric imaging in the above apparatus will be briefly described with reference to the attached FIG. 11. That is, in order to switch from panoramic imaging to cephalometric imaging, first operate the arm lock focus mechanism to rotate horizontal swing arm b relative to arm support a and set it at the appropriate position for cephalometric imaging (see Figure 2). . Next, the lock pin C for fixing the X-ray generator C is unlocked, and in this state, the X-ray generator C is rotated, and when it comes to the lock position appropriate for cephalometric imaging, the lock pin C1 is used to lock the X-ray generator C. This is done by locking it again. Conversely, when switching from cephalometric imaging to panoramic imaging, the lock pin C is released, the X-ray generator C is rotated and relocked, and the angle of the X-ray generator C is changed to an appropriate position for panoramic imaging. The arm lock pin b1 is brought into the unlocked state. Such an operation requires many operating steps such as rotating and stopping the horizontal rotating arm b, unlocking, rotating, and relocking the X-ray generator C, and the troublesome operation is negligible. vinegar,
Additionally, there are problems with operability, such as requiring both hands of the operator, and improvements have been desired.

The present invention has been made in order to eliminate the above-mentioned problems, and it is possible to rotate and stand still the horizontal rotating arm at the same time as the angle switching operation of the X-ray generator by performing two consecutive operations.
The present invention provides a novel panoramic X-ray imaging device that also functions as cephalometric imaging, which has a different specific mechanism that can simultaneously release the lock, rotate the X-ray generator, rotate and stop the lock, and rotate and stop the horizontal rotating arm. This is what I am trying to do.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be explained based on the attached embodiment figures. Fig. 1 is a front view showing one embodiment of the device of the present invention, The figure is a plan view of the same device, FIG. 3 is an enlarged perspective view of the part marked with ■ in FIG. 6 is a partially cutaway perspective view of another embodiment, and FIG. 7 is an explanatory diagram of the operation of an embodiment of the angle switching mechanism of the X-ray generator.
FIGS. 8 to 10 are schematic diagrams showing other embodiments of the angle switching mechanism. That is, the gist of the specific invention of the present invention is that a column 1, an arm support 11 fixed to the column 1, a horizontal swing arm 3 supported by the support 11, and an arm 3.
an X-ray generator 5 supported at one end via an angle switching mechanism 4 and a support shaft 51 so as to be able to switch the irradiation angle; and a head fixation device 6 for head standard photography, which is spaced apart from the above-mentioned support. In a full-jaw X-ray imaging device that also performs head standard X-ray imaging,
An arm lock mechanism 2 between the horizontal swing arm 3 and the arm support 11 for keeping the arm 3 stationary at an appropriate angle.
The locking mechanism 2 is linked to the angle switching mechanism 4, and the arm locking mechanism 2 is locked and unlocked in conjunction with the switching operation of the switching mechanism 4. The gist of the second invention resides in a full-jaw X-ray imaging device that also performs standard XS imaging, and in the above-mentioned full-mouth X-ray imaging device, the angle switching mechanism 4 controls the X-ray generator 5 at an appropriate angle. a locking mechanism 7 for maintaining the locking mechanism 7;
an operating means 8 for locking and unlocking; an operating lever 9 rotatably fitted on the support shaft 51 and linked to the operating means 8; and an operating lever 9 for rotating the X-ray generator 5 to an appropriate angle; The locking mechanism 6 is comprised of a rotation regulating means 10 for regulating the operation lever 9 to rotate in cooperation with the X-ray generator 4 when the locking mechanism 6 is unlocked, and the arm is disposed between the horizontal swing arm 3 and the arm support 11. 3 is provided with an arm lock mechanism 2 for stopping the camera at an appropriate angle, and the arm lock mechanism 2 can be locked and locked by operating the operating lever 9.
A full-jaw X-ray photographing device which also serves as head standard X-ray photographing is characterized in that it is unlocked.

1 and 2, a film cassette holder 31 is provided at the other end of the horizontal rotating arm 3, and a head for panoramic photography is provided between the X-ray generator 5 and this film force set holder 31. A fixing device 32 is provided,
While rotating the x4 generator 5 and film cassette holder 31 around the patient's head fixed by the head fixing device 32, the patient's head is fixed by the head fixing device 32.
Radiography is being carried out. Reference numeral 30 in the figure is an arm cover.

In addition, the head fixing device 6 for cephalometric imaging is spaced apart from the support 1 via a holding frame 61, and a film cassette holder 62 is provided behind the head fixing device 6. The X-ray generator 5
Cephalometric imaging is possible by irradiating X-rays and forming an image on the film in the film cassette holder 62.

The specific configuration of the arm lock mechanism 2 and the angle switching mechanism 4 related thereto will be explained in detail in the embodiments described later, but in general, the angle switching mechanism 4 is operated to control the X-ray generator 5. When set at an appropriate angle for head standard photography,
In order for the arm locking mechanism 2 to be in the locked state, and when the locking mechanism 7 is shifted from the locked state to the unlocked state by the operation of the locking/unlocking actuating means 8, the rotation regulating means 10 is used to control the lever 9 and the X-ray The X-ray generator 5 rotates in cooperation with the X-ray generator 5, and the locking mechanism 7 is locked again so that the X-ray generator 5 is left still at an appropriate angle.

(Function) The mechanism for rotating and resting the arm 3 and changing the angle of the X-ray generator 5 in the X-ray imaging apparatus having the above configuration will be described with reference to FIGS. 3 to 10. Figures 3 and 7 to 10 (
The position of the X-ray generator 5 indicated by the solid line (solid line) is an appropriate position for panoramic photography, and its X-ray irradiation axis is aligned with the film cassette holder 31 (
(see Figures 1 and 2). From this state,
To change the angle of the X-ray generator 5 for cephalometric imaging, operate the lock/unlock actuator 8 to unlock the lock mechanism 7, and then turn the operating lever 9 to the left (before operation, it should be at the right end). When the lever 9 is regulated by the rotation regulating means 10, the lever 9 rotates in cooperation with the X-ray generator 5. When the lever 9 is operated at an angle of 0□ in this cooperative rotation state, the locking mechanism 7 enters another locking state, and the X-ray generator 5 is rotated at an angle of θ
The angle is changed by 2 (the position shown by the dashed line in FIGS. 3, 7, and 10), and the device is left still at that position. In addition, when operating this lever 9, the X-ray angle conversion mechanism 4, that is, the lever 9
Since the arm locking mechanism 2 is linked to the arm locking mechanism 2, when the arm locking mechanism 2 shifts from the unlocked state to the locked state and the arm 3 is also rotated at the same time (in the state of panoramic shooting, the arm 3 is moved to the arm support 11). On the other hand, when the arm 3 reaches the appropriate position for cephalometric imaging, the arm lock mechanism 2 is locked to the arm support 11 ( (see FIG. 4), the arm 3 and arm support 11 are in a fixed relationship. As a result, the X-ray irradiation axis is oriented in an appropriate direction for cephalometric imaging, that is, so that the film cassette holder 62 for cephalometric imaging is irradiated correctly. In this way, the X-ray generator 5 can be unlocked, rotated and relocked, and the arm 3 can be easily stopped at an appropriate position by only turning the operating lever 9 and the arm 3. On the other hand, to change the angle from a position appropriate for cephalometric imaging to a position appropriate for panoramic imaging, operate the lever 9 in the opposite direction to the above, and the angle of the X-ray generator 5 will be changed to a position appropriate for panoramic imaging. At the same time, the arm lock mechanism 2
will be unlocked, and the conditions necessary for panoramic shooting will be in place.

(Example) Next, the present invention will be explained in further detail with reference to Examples.

(Example-1) In FIG. 3, FIG. 4, and FIG. 7, the locking mechanism 7 of the X-ray generator 5 is always attached facing the support shaft 51 of the A pair of lock pins 72 are loaded in a resilient state and are spaced apart at an angle θ2 along an arc centered on the support shaft 51 so that the tips of the lock pins 72 are immersed and received on the upper surface of the X-ray generator 5. lock recess 73
．． It consists of 73. This angle 0□ means an angular difference between positions appropriate for cephalometric imaging and panoramic imaging. Reference numeral 74 in the figure is a plate fixed to the upper surface of the X-ray generator 5 to form the locking recesses 73, 73.

The locking/unlocking actuating means 8 consists of a chevron-shaped cam piece 81 formed at the tip of the lever 9, and a cam pin 82 protruding from the circumferential body of the lock pin 72. This cam piece 8
1 consists of left and right inclined cam surfaces 811, 812 and a central top cam surface 813, and by operating the lever 9, the cam pin 82 of the lock pin 72 is moved to the inclined cam surface 811.
Alternatively, when the lock pin 72 presses and slides on the top cam surface 813 and reaches the top cam surface 813, the lock pin 72 resists the elasticity of the compression spring 71 and becomes unlocked. When the tip of the lock pin 72 is inserted into the lock recess 73, 73, the X-ray generator 5 is placed in a locked state, and the X-ray generator 5 is fixed at a position appropriate for panoramic or cephalometric imaging. . If the lock pin 72 is cylindrical, it is expected that it will rotate around its axis under the action of the lock/unlock operating means 8, so there will be a gap between the lock pin 72 and the pin hole. It is desirable to provide suitable anti-rotation means.

The operating lever 9 is rotatably fitted to the support shaft 51,
The chevron-shaped cam piece 81 is formed at its tip as described above. Additionally, a pair of protrusions 101 are provided on the upper surface of the X-ray generator 5.
, 101 are provided protrudingly, and both the protrusions 101, 101
The lever 9 is located between the two protrusions 101.
．． Reference numeral 101 constitutes lever rotation regulating means 10 . These protrusions 101, 101 are arranged so that the lever 9 comes into contact with one of the protrusions 101, and when the lever 9 is operated from this state (angle 01), the cam pin 82 approaches the top cam surface 813 of the cam piece 81, and the lock pin When the lever 72 is in the unlocked state, the lever 9 is arranged in a positional relationship such that it comes into contact with the other protrusion 101, and when the lever 9 is further operated, it is restricted by the other protrusion 101 that it came into contact with, and the lever 9 and The X-ray generator 5 and the X-ray generator 5 rotate together (angle θ2), and the angle of the X-ray generator 5 is changed as described above.

The horizontal swing arm 3 is loaded with an arm lock pin 21 that is elastically biased upward by a compression spring 211, and the arm support 11 is provided with a lock hole 22 for receiving the upper end of the lock pin 21. This lock hole 22
The arm 3 is locked/unlocked with respect to the arm support 11 by projecting and retracting the upper end of the lock pin 21 relative to the arm support 11 . The arm 3 is provided with an inverted L-shaped operating rod 23 that swings up and down about a fulcrum 231, and a slot 232 formed at the tip of the operating rod 23 is inserted into the side peripheral body of the lock pin 21. A fixed engagement pin 212 is loosely inserted, and a roller 233 is pivotally attached to the side of the downward proximal end of the operating rod 23. A cam block 24 having an inclined cam groove 241 is fixed on the upper surface of the operating lever 9, and a roller 233 of the operating rod 23 is housed in the inclined cam groove 241 so as to be freely movable along the direction of the groove. There is. These arm lock pins 21. The arm lock mechanism 2 is constituted by the lock hole 221, the operating rod 23, and the cam block 24.

By rotating the operating lever 9, the inclined cam groove 2
A roller 233 relatively rolls within 41, and this roller 2
Due to the regulated movement within the cam groove 241 of 33, the operating rod 23
The arm lock pin 21 swings up and down, and as the tip of the operating rod 23 moves up and down, the arm lock pin 21 moves up and down due to the regulating action of the slot 232 and the engagement pin 212, and the tip of the arm lock pin 21 moves up and down into the lock hole 22. The locked/unlocked state of the horizontal swing arm 3 with respect to the arm support 11 can be arbitrarily switched. In FIG. 4, when the lever 9 is at the right end (solid line), it is in a proper position for panoramic photography, and at this time the arm lock pin 21 is in an unlocked state.

Then, when the lever 9 is rotated to the left, the arm lock mechanism 2 acts as described above and the arm lock pin 21 moves upward, and at the same time, when the horizontal rotation arm 3 is rotated to the appropriate position for cephalometric imaging, two As shown by the dotted chain line, the tip of the arm lock pin 21 is inserted into the lock hole 22, and the arm 3
and arm support 11 are locked and fixed, and X
The angle of the line generator 5 is also changed to a position appropriate for cephalometric imaging. Note that the slot 232 at the tip of the operating rod 23
is larger than the engagement pin 222 of the arm lock pin 21, and this is because when the arm lock pin 21 is pushed up to the uppermost position and fitted into the lock hole 22, the lock pin 21 is pushed up by the action of the compression spring 211. The lock pin 21 and lock hole 2 should be raised several points higher than when locked.
This is so that even if the lock pin 21 is slightly misaligned, the tip of the lock pin 21 acts as a guide to facilitate fitting. Further, reference numeral 52 in the figure is an X-ray irradiation port.

(Example 2) FIG. 5 shows another example of the related structure of the angle switching mechanism between the arm lock mechanism 2 and the X-ray generator 5, and is similar to the first example above. compression spring 211
A wire 25 is stretched between the arm lock pin 21, which is always urged upward, and the operating lever 9 via pulleys 251, 252, and the arm lock mechanism is activated by the wire 25 and the arm lock pin 21. It is configured. That is, when the lever 9 is rotated to a position appropriate for panoramic photography (the state shown by the chain line in the figure), the lock pin 21 is pushed down by the wire 25, resulting in an unlocked state. On the other hand, when the lever 9 is rotated to the appropriate position for cephalometric imaging (the state shown by the solid line in the figure), the wire 25
is loosened, and the lock pin 21 rises due to the restoring elasticity of the compression spring 211 and becomes locked.

(Embodiment 3) FIG. 6 shows an example in which the turning movement of the lever 9 is changed into the vertical movement of the arm lock pin 21 by the gear mechanism 26, thereby linking the arm lock mechanism 2 and the angle conversion mechanism. be. Two pillars 261, 261 are erected on the lever 9, and the pillars 261. z6t is inserted into the arcuate grooves 331 and 331 (the center of curvature is the axis of the support shaft 51) formed in the lower support plate 33 of the horizontal swing arm 3, and these supports 26
1.261 is connected to a vertical rotation shaft 262 coaxial with the support shaft 51. Further, a bevel gear 263 is fixed to the upper end of this vertical rotating shaft 262, and the rotational movement of the rotating shaft 262 is transmitted to the horizontal rotating shaft 265 via the bevel gear 263 and a bevel gear 264 meshed with the bevel gear 263, The lock pin 21 is configured to move up and down through engagement between the pinion gear 266 and a rack gear 267 formed integrally with the arm lock pin 21. That is, as the lever 9 is rotated, the gear mechanism 26 causes the arm lock pin 21 to move up and down, and its tip enters and retracts into the lock hole 22, thereby locking and unlocking the horizontal swing arm 3 with respect to the arm support 11. It will be done.

(Embodiment 4) Fig. 8 shows another embodiment of the angle switching mechanism 4 of the X-ray generator 5, in which a lock pin 72 similar to the first embodiment has a lock pin 72 at its tip opposite to the above. A cam piece 83 is fixedly provided, and a cam pin 84 associated with the cam piece 83 is protruded from the tip of the operating lever 9, and the action of the cam pin 84 and the cam piece 83 causes the lock pin 72 to lock as described above. rock·
unlocked. In addition, an engagement pin 102 is protruded from the lower surface of the operating side of the operating lever 9, and an arcuate groove 103 into which the engagement pin 102 can be loosely inserted is formed on the upper surface of the X-ray generator 5, at the center of the curvature of the support shaft 51. It is recessed as a.

The arcuate angle of the arcuate groove 103 is approximately equal to the angle θ1, and the arcuate groove 103 and the engagement pin 102 constitute the lever rotation regulating means 10. That is, when the lever 9 is rotated within the angular range of the arcuate groove 103,
When the lock pin 72 is locked/unlocked and comes into contact with the end of the arcuate groove 103, and further operations are performed, the X-ray generator 5 is A state of cooperative rotation is achieved and an angular transformation of the X-ray generator 5 is performed as described above. The rest of the configuration is the same as that of the first embodiment, so a detailed explanation thereof will be omitted.

(Example 5) FIG. 9 shows a locking recess 73, 73 similar to the above, a ratchet type lock pin 75 supported on the arm 3 so as to be swingable about a fulcrum 751, and the lock pin 75. A locking mechanism 7 consisting of a compression spring 76 that always maintains the tip of the spring in an elastically biased state in the direction of the support shaft 51 of the X-ray generator 5.
It is shown.

In addition, a cam pin 82 is fixed to the circumferential body of the lock pin 75, so that the lock pin 75 is locked and unlocked by the same lock/unlock actuating means 8 as in the first embodiment. being done. Since the other configurations are similar to those of the first embodiment, detailed explanation thereof will be omitted.

(Embodiment 6) The embodiment of the angle switching mechanism 4 shown in FIG. On the other hand, it is fitted into the lever 9 through an elongated hole 91 opened along its longitudinal direction, and furthermore, a lock pin 77 is provided protruding from the tip of the lever 9. Two locking recesses 78.78 for receiving the locking pin 77 are formed on the lower surface of the horizontal swing arm 3, and the locking recess 78.78 and the locking pin 77
A locking mechanism 7 is constituted by the above.

The locking recesses 78, 78 are spaced apart from each other by an angle θ2 (the angular difference between the positions suitable for panoramic imaging and cephalometric imaging as described above) on a curve whose center of curvature is the center of the support shaft 51. Additionally, the lever 9 is always elastically biased toward its tip by a spring 85, and the spring 85 and the lever 9 itself constitute the locking/unlocking actuating means 8.

Furthermore, another elongated hole 104 is opened in the middle of the lever 9 along its longitudinal direction, and a pin 105 protruding from the upper surface of the X-ray generator 5 slides into the elongated hole 104. The pin 105 and the elongated hole 104 are freely inserted and inserted, and the rotation regulating means 10 is constituted by the pin 105 and the elongated hole 104. In the angle switching mechanism 4 having such a configuration, when the operating lever 9 is pulled backward against the elasticity of the spring 85, the lock pin 77 at the tip of the operating lever 9 is pulled backward.
is pulled out from the locking recess 78 and becomes unlocked. When the lever 9 is further rotated, the lever 9 and the X-ray generator 5 are controlled by the pin 105 and the elongated hole 104.
and rotate around the axis of the support shaft 51, and when the pulling operation of the lever 9 is stopped when the lever 9 has rotated by 02 degrees, the lock pin 77 fits into another locking recess 78 and
The line generator 5 is brought to a locked standstill state. As a result, the X and W irradiation axes of the X-ray generator 5 are angularly converted to positions appropriate for panoramic and cephalometric imaging. In the illustrated example, the spring 85 is elastically loaded between the pin 105 and the lever 9.

A case where the bullet is loaded between the support shaft 51 and the lever 9 is not excluded.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, in the embodiment, the arm lock pin 21 is moved vertically relative to the arm support 11 to lock and unlock the arm, but there is a mechanism for locking and unlocking the arm lock pin 21 on the side of the support 11 from the horizontal direction. The present invention is also applicable to the case of locking and unlocking. In addition, although the above embodiment shows an example in which a mechanical means is used as a means for operating the arm lock mechanism 2 by turning the lever 9, the present invention is not limited to this. For example, the lever 9 and a limit switch etc. may be linked , ffi motor, various cylinders, etc. are of course possible. It goes without saying that other changes are possible without departing from the Ikemizu invention.

(Effects of the Invention) As described above, in the panoramic imaging device of the present invention that also serves as cephalometric imaging, the X-ray generator can be unlocked, rotated, and relocked by lever operation, and the horizontal rotation arm can be rotated and rotated. Since it is stationary, the X-ray generator and horizontal rotating arm can be easily changed to the appropriate angle for cephalometric imaging and panoramic imaging. You can operate this.

Furthermore, the position of the X-ray generator can be visually determined based on the stop position of the lever, which is extremely convenient. The present invention having such remarkable advantages is extremely useful.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the device of the present invention, Fig. 2 is a plan view of the same device, Fig. 3 is an enlarged perspective view of the part marked with ■ in Fig. 1, and Fig. 4 is the same embodiment. An explanatory diagram of the operating state of
FIG. 5 is a mechanism explanatory diagram of another embodiment, FIG. 6 is a partially cutaway perspective view of still another embodiment, and FIG. 7 is an operation explanatory diagram of one embodiment of the angle switching mechanism of the X-ray generator. 8 to 10 are schematic views showing other embodiments of the angle switching mechanism, and FIG. 11 is a partial perspective view showing an example of a conventional device. (Explanation of symbols) 1... Support column, 11... Arm support, 2... Arm lock mechanism, 3... Horizontal swing arm, 4... Angle switching mechanism, 5... X-ray generation Vessel, 51...Spindle, 6.
... Head fixing device for head standard photography, 7... Lock mechanism, 8... Lock/unlock actuation means, 9... Operating lever, 10... Rotation regulating means. One or more applicants Sori Seisakusho Co., Ltd. Agent Patent Attorney (6235) Hidehiko Matsuno Figure 2 Figure 3 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1. A column (1), an arm support (11) fixed to the column (1), and a horizontal swing arm (3) supported by the support (11); An X-ray generator (5) supported at one end of the arm (3) via an angle switching mechanism (4) and a support shaft (51) so as to be able to switch the irradiation angle; In a full-jaw X-ray imaging device that also performs head standard X-ray photography, the horizontal rotation arm (3) and the arm support (11) include a head fixation device (6) for standard head photography.
an arm locking mechanism (2) for stopping the arm (3) at a proper angle between the two, the locking mechanism (2) is linked to the angle switching mechanism (4), and the switching mechanism (4) In conjunction with the switching operation, the arm lock mechanism (2) is locked.
A full-jaw X-ray imaging device that also serves as head standard X-ray imaging, characterized in that it is unlocked. 2. Operate the angle switching mechanism (4) to turn the X-ray generator (5)
2. The apparatus according to claim 1, wherein the arm locking mechanism (2) is in a locked state when the arm locking mechanism (2) is set at an angle appropriate for head standard photography. 3. A strut (1), an arm support (11) fixed to the strut (1), a horizontal swing arm (3) supported by the support (11), and an arm support (11) fixed to the strut (1); An X-ray generator (5) supported at one end so as to be able to switch the irradiation angle via an angle switching mechanism (4) and a support shaft (51), and a head standard imaging device spaced apart from the support (1). In a full-jaw X-ray imaging device that also performs head standard X-ray imaging and includes a head fixation device (6), the angle switching mechanism (4) maintains the X-ray generator (5) at an appropriate angle. a locking mechanism (7) for locking and unlocking the locking mechanism (7);
) and for rotating the X-ray generator (5) to an appropriate angle; and the locking mechanism (6).
) is unlocked, move the operating lever (9) to the X-ray generator (
5) rotation regulating means (10) that regulates rotation in cooperation with
An arm lock mechanism (2) is provided between the horizontal swing arm (3) and the arm support (11) to keep the arm (3) stationary at an appropriate angle, and the arm lock A full-jaw X-ray imaging device which also serves as head standard X-ray imaging, characterized in that the mechanism (2) is locked and unlocked by operating the operating lever (9). 4. Operate the angle switching mechanism (4) to turn the X-ray generator (5)
) is set at an angle appropriate for head standard photography, the arm locking mechanism (2) is in a locked state.