KR102381302B1 - Backlash Prevention Structure of Mammography Device - Google Patents

Abstract

The anti-backlash structure of the mammography device according to an embodiment of the present invention is provided on the C arm of the mammography device, and an arm frame coupled to a rotation shaft connected to the C arm support of the mammography device, and coupled within the arm frame and a driving unit including a worm gear unit driven according to the rotation of the motor and a rotation driving gear rotated according to the driving of the worm gear unit, and coupled to the arm frame, for driving the rotation driving gear around the rotation shaft Accordingly, it includes a rotating unit that is driven to rotate forward and backward within a predetermined range, and a first backlash adjusting unit for limiting the backlash of the worm gear unit when the motor rotates.
The anti-backlash structure of the mammography apparatus according to an embodiment of the present invention is between the rotational drive gear and the rotational drive gear, and the rotational movement gear formed in the rotational part to engage the rotational drive gear when the rotational part is rotated. It may further include a second backlash adjusting unit for adjusting the interval.

Description

Backlash Prevention Structure of Mammography Device

The present invention relates to an anti-backlash structure, and more particularly, to a backlash-preventing structure of a mammography apparatus capable of minimizing backlash that may occur when driving the mammography apparatus.

Backlash refers to a gap between the tooth surfaces when a pair of gears mesh. If the backlash is too small, lubrication becomes insufficient and friction between the tooth surfaces may increase. On the other hand, when the backlash is too large, the meshing between the gears deteriorates, and the gears are liable to be damaged.

Therefore, in order to smoothly rotate a pair of meshing gears, proper control of backlash is required.

In general, when designing gears, the thickness of gears and the number of teeth in meshing gears are adjusted to form appropriate backlash. If the gear is not engaged, vibration may occur.

The mammography apparatus is a medical device capable of diagnosing breast cancer early by compressing and fixing the breast as a subject, irradiating radiation, and acquiring an image inside the subject using an X-ray that has passed through the subject.

In addition, the mammography apparatus has various advantages by using radiation-specific X-ray imaging technology, and in particular, it is unique in that it minimizes exposure through image enlargement, reduction in number of shots, increase in resolution, and adjustment of brightness and contrast ratio. It is rapidly disseminated with the characteristics of

By using the mammography device, the basic photographing postures for breast cancer screening are a CC (Cranio-Caudal) photographing posture that photographs the left and right breasts up and down, and a MLO (Mediolateral oblique) photographing posture of photographing the left and right breasts in an oblique direction. there is

Typically, the mammography apparatus is provided with a pillar-shaped support perpendicular to the floor.

In addition, the mammography apparatus is connected so as to be rotatable about a rotation shaft connected to the support part in the middle part, and both ends are formed in an arc shape facing each other to form a C-arm or a C-arm showing a similar shape as a whole. be prepared

The C arm includes an arm-frame forming a middle part of the C arm, and a rotating part coupled to the arm frame and configured to be rotatable about a rotation shaft connected to the support, and the rotating part is mounted on one end. It is provided with an X-ray irradiation unit for irradiating X-rays toward the bottom.

A detector facing the X-ray irradiation unit and a compression paddle that linearly reciprocate between the X-ray irradiation unit and the detector along the inner surface of the arm frame are coupled to the arm frame.

On the other hand, the MLO imaging method is a 2D imaging method in which the entire C arm is rotated around a rotation shaft connected to the support part to photograph the subject, and the middle part of the C arm is maintained in a fixed state with respect to the support part and the rotation shaft connected to the support part There is a 3D imaging method in which the subject is photographed by rotating the above-described rotating part around the .

For 3D imaging of the subject in the MLO imaging, a worm gearbox may be employed as a driving means for rotating the rotating part of the C arm in the aforementioned arm frame.

However, most of the worm gearboxes provided in the existing mammography apparatus are expensive, and if the expensive worm gearbox is employed, there is a problem in that the unit price of the mammography apparatus is increased.

On the other hand, when a low-cost worm gear box is employed to lower the manufacturing cost of the mammography apparatus, excessive backlash may occur in the worm gear box when the rotating part is driven.

In a mammography apparatus employing a low-cost worm gearbox, if backlash is continuously generated, the precision during rotational driving of the rotating part may be reduced by the amount of backlash generated.

In addition, there is a problem in that precise image capturing is not performed because vibration is generated in the radiation generating unit located in the aforementioned X-ray irradiation unit due to the generated backlash.

Registered Patent Publication No. 10-2020790

An object of the present invention is to provide an anti-backlash structure of a mammography apparatus capable of minimizing backlash in a worm gearbox in a driving means for rotating a rotating part provided in the C arm of the mammography apparatus.

The anti-backlash structure of the mammography apparatus according to an embodiment of the present invention is provided in the C arm of the mammography apparatus, and an arm frame coupled to a rotation shaft connected to the C arm support of the mammography apparatus, and coupled within the arm frame and a driving part including a worm gear part driven according to the rotation of the motor and a rotation driving gear rotated according to the driving of the worm gear part, coupled to the arm frame, and driving the rotation driving gear around the rotation shaft Accordingly, it is characterized in that it comprises a first backlash adjusting unit for limiting the backlash of the worm gear unit during rotation of the rotating portion and the motor rotated forward and backward within a predetermined range.

Preferably, the driving unit includes a driving unit body fixedly coupled to the arm frame and having the worm gear unit therein, and the worm gear unit includes a worm wheel driving shaft provided in the driving unit body and coupled to the rotation shaft of the motor. It characterized in that it comprises a worm wheel and a worm shaft that is rotated by meshing with the worm wheel.

Preferably, the driving unit is formed on the driving unit main body, the motor is coupled, it characterized in that it further comprises a first fixing unit through which the rotating shaft of the motor and the worm wheel driving shaft pass.

Preferably, the first fixing portion includes an outer portion formed on the upper portion of the driving unit body, and a recessed portion concavely formed inside the outer portion, and the worm wheel drive shaft passes through the hole inside the recessed portion, characterized in that do.

Preferably, the first backlash adjusting part is seated on the first fixing part, a first block through which the rotation shaft of the motor passes, and the worm wheel drive shaft, through which the rotation shaft of the motor passes, the first block a second block positioned inside the, and disposed on the second block, through which the rotation shaft of the motor passes, and a bearing positioned inside the first block and inserted between the bearing and the second block , at least one ring member for limiting vertical movement of the worm wheel drive shaft when the rotation shaft of the motor is rotated, wherein the number of the ring members is adjusted according to the vertical movement amount of the worm wheel drive shaft.

Preferably, the first block includes a side portion coupled to the outer portion, a convex portion that is formed inside the side portion, a convex portion seated in the recess portion, and a convex portion formed inside the convex portion, through which the rotating shaft of the motor passes and a through hole, wherein the second block and the bearing are positioned in the through hole in a state in which the motor is coupled to the first fixing part.

Preferably, the motor includes a protrusion seated on the convex portion and a stepped portion formed on a radially inner side of the protrusion, wherein an upper portion of the bearing is inserted into the stepped portion.

Preferably, the second block is seated on the worm wheel drive shaft, it characterized in that it comprises a seating portion for supporting a lower portion of the bearing and a support portion for supporting the rotation shaft of the motor.

Preferably, a hole is formed in the center of the ring member, a rotation shaft of the motor passes through the hole of the ring member, and the ring member is inserted into the support portion through the hole of the ring member to be inserted into the second block. It is inserted and characterized in that it is seated on the seating portion.

The anti-backlash structure of the mammography apparatus according to another embodiment of the present invention is provided on the C arm of the mammography apparatus, and an arm frame coupled to a rotation shaft connected to the C arm support of the mammography apparatus, and coupled within the arm frame and a driving part including a worm gear part driven according to the rotation of the motor and a rotation driving gear rotated according to the driving of the worm gear part, coupled to the arm frame, and driving the rotation driving gear around the rotation shaft A second to adjust the interval between the rotational part driven to rotate within a certain range and the rotational driving gear when the rotational part is driven, the rotational drive gear and the rotational movement gear formed in the rotational part and formed to mesh with the rotational drive gear It is characterized in that it includes a backlash control unit.

Preferably, the driving unit includes a driving unit body fixedly coupled to the arm frame and having the worm gear unit therein, and the worm gear unit includes a worm wheel driving shaft provided in the driving unit body and coupled to the rotation shaft of the motor. It characterized in that it comprises a worm wheel and a worm shaft that is rotated by meshing with the worm wheel.

Preferably, the rotation drive gear is coupled to the worm shaft, characterized in that it is rotated according to the rotation of the worm shaft.

Preferably, the driving unit is formed on the driving unit main body, characterized in that it further comprises a second fixing unit through which the worm shaft passes.

Preferably, the second backlash adjusting unit includes an elastic member having one end coupled to the driving unit body and the other end coupled to the rotational driving gear, the elastic member seated and coupled to the second fixing unit, and the worm shaft It characterized in that it comprises a fixed block passing through, a slip prevention member coupled to the front side of the rotational drive gear, shaft-coupled to the worm shaft, and preventing the rotational drive gear from slipping.

Preferably, when the rotating part is rotationally driven within a certain range, the elastic member is tensioned to apply an elastic force to the rotating part, and when the rotating part is returned to its original position, the elastic member is restored to the rotating part It is characterized in that it imparts elasticity.

Preferably, when the rotational part is rotationally driven within a certain range, the elastic member is tensioned in the rotational direction of the rotational part using the driving unit main body as a supporting point to adjust the interval between the rotational drive gear and the rotational movement gear and, when the rotating part is returned to its original position, the elastic member is restored along the rotational direction of the rotating part using the driving unit body as a supporting point to adjust the distance between the rotational drive gear and the rotational movement gear. do.

Preferably, the rotating unit includes a first frame provided with a radiation generating unit for irradiating radiation to an object, a second frame vertically coupled to an end of the first frame and having the rotational shifting gear therein; 2 is provided in the frame, and includes an insertion hole into which the rotation drive gear is inserted, wherein the rotation movement gear is formed in the insertion hole.

Preferably, the second frame includes an insertion part into which the rotation shaft is inserted, and the rotation shaft inserted into the insertion part is coupled to the rotation part coupling part of the arm frame to couple the second frame to the arm frame. characterized in that

Preferably, when the rotational driving gear is driven, the second frame is rotationally driven with respect to the arm frame with the rotational shaft coupled to the rotational part coupling part as a rotational center, and the driving part is the rotational part coupled to the rotational part. When it is, characterized in that it maintains the state fixed to the arm frame.

According to the present invention, in the worm gear box for rotating the rotating part provided on the C arm of the mammography apparatus, backlash that may occur in the input part and the output part of the worm gear box when the worm gear box is operated can be minimized. Accordingly, the vibration transmitted to the radiation generating unit is reduced, so that a higher quality image can be obtained from the detection unit.

In addition, in the mammography apparatus according to an embodiment of the present invention, since it is possible to have a structure that minimizes backlash that may occur during operation of the worm gear box, the degree of freedom in selecting the worm gear box is increased to lower the manufacturing cost of the mammography apparatus. there is.

1 is a view showing a mammography apparatus according to an embodiment of the present invention.
Figure 2 is a view showing the arm frame and the rotating unit of the mammography apparatus according to an embodiment of the present invention.
3 is a view showing a driving unit of the mammography apparatus according to an embodiment of the present invention (enlarged view of part A of FIG. 2).
4 is an exploded perspective view showing the configuration of the input unit in the driving unit.
5 is a cross-sectional view in the B-B' direction of the driving unit.
6 is an exploded perspective view showing the configuration of the output unit in the driving unit.
7 is a cross-sectional view in the direction C-C' of the driving unit.
8 is a view showing a state in which the arm frame and the rotating part of the mammography apparatus according to an embodiment of the present invention is coupled.
FIG. 9 is a partially enlarged view of FIG. 8 (enlarged view of part D of FIG. 8 ).
10 is a view showing the driving of the rotating unit when power is transmitted from the driving unit.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical spirit of the present invention is not limited thereto and may be variously implemented by those skilled in the art without being limited thereto.

1 is a view showing a mammography apparatus 1 according to an embodiment of the present invention.

Referring to FIG. 1 , the mammography apparatus 1 according to an embodiment of the present invention may include a C-arm (C-arm) 2 .

In one embodiment, the C arm 2 may have an “alphabet C” shape in which both ends face each other in an arc shape.

As shown in FIG. 1 , the middle part of the C arm 2 may be the arm frame 100 , and the rotating part 300 formed so that one side is bent downward may be coupled to the arm frame 100 .

An irradiating unit 4 for irradiating radiation (not shown) toward an object (not shown) may be provided at one end of the rotating unit 300 .

At this time, the object may be a human breast, and X-rays may be used as the radiation irradiated from the irradiator 4 , but the present invention is not limited thereto, and various modifications such as gamma rays may be used for medical purposes. implementation is possible.

In addition, the detection unit 5 is provided in the arm frame 100 to face the irradiation unit 4 , and the above-described object may be disposed on the detection unit 5 .

As an example, an X-ray detector for detecting X-rays irradiated from the irradiation unit 4 may be disposed inside the detection unit 5 .

The arm frame 100 may be coupled to a lifting unit 6 that linearly reciprocates between the irradiation unit 4 and the detection unit 5 along the inner surface of the arm frame 100 .

At this time, the compression band 7 is coupled to the lifting unit 6 so that the compression band 7 can press or release the compression of the object according to the linear reciprocating movement of the lifting unit 6 .

The mammography apparatus 1 includes a columnar C-arm support 3 perpendicular to the floor, and the aforementioned C-arm 2 has a middle portion on one side of the C-arm support 3 as shown in FIG. 1 . may be rotatably coupled to the

The arm frame 100 is coupled to a rotation shaft (not shown) connected to the C arm support part 3, and is rotated about the rotation shaft according to the photographing posture using the mammography apparatus 1, as will be described later, or the C arm support part (3) can be maintained in a fixed state.

As an example, the C-arm support 3 may be a frame fixed to the floor.

In addition, the rotating part 300 is coupled to the arm frame 100 as described above, and the rotating part 300 may be configured to be rotatable about a rotation axis connected to the C-arm support part 3 .

On the other hand, the basic photographing posture for breast cancer screening using the mammography apparatus 1 is a CC (Cranio-Caudal) photographing posture for photographing an object up and down, and a MLO (Mediolateral oblique) photographing posture for photographing the object in an oblique direction. there is.

As an example, during CC imaging, the arm frame 100 and the rotating part 300 may be positioned to be parallel to the C arm support part 3 .

The MLO imaging method is a 2D imaging method in which the entire C arm 2 is rotated about a rotation shaft connected to the C arm support part 3 to photograph an object, and the arm frame 100 is fixed with respect to the C arm support part 3 . There is a 3D imaging method in which the object is photographed by rotating the rotating unit 300 around the rotating shaft connected to the C-arm support unit 3 to maintain the fixed state.

As an example, during 2D imaging of an object in ML0 imaging, the aforementioned arm frame 100 and the rotating part 300 may be rotated about a rotation axis connected to the C arm support part 3 .

At this time, the arm frame 100 and the rotating unit 300 may be rotated by rotational power provided in the C-arm support 3 and transmitted to the rotating shaft from a separate driving means (not shown) connected to the rotating shaft. .

During 3D imaging of an object in ML0 imaging, the arm frame 100 is fixed with respect to the C-arm support 3 , and only the rotating part 300 is connected to the C-arm support 3 with the arm frame 100 as a center of a rotation axis connected to the C-arm support 3 . ) can be rotated about

In this state, the rotating unit 300 may be driven to rotate forward and reverse within a predetermined range with respect to the arm frame 100 .

Hereinafter, in the embodiment of the present invention, a structure capable of minimizing backlash that may be generated due to rotational driving of the rotating unit 300 during 3D imaging of an object in ML0 imaging will be described in detail.

2 is a view showing the arm frame 100 and the rotating unit 300 of the mammography apparatus 1 according to an embodiment of the present invention.

In FIG. 2, illustration of the C-arm support part 3, the irradiation part 4, the detection part 5, the lifting part 6, and the compression band 7 demonstrated with FIG. 1 is abbreviate|omitted.

Referring to FIG. 2 , the driving unit 200 may be coupled to the aforementioned arm frame 100 .

The driving unit 200 includes an input unit 200a connected to a motor 260 to be described later and receiving power from the motor 260 , and a rotating unit 300 connected to the rotating unit 300 and receiving power transmitted from the input unit 200a. ) includes an output unit 200b to transmit it.

As an example, the driving unit 200 may be a type of a worm gear box.

The rotating unit 300 is vertically coupled to the end of the first frame 310 and the first frame 310 provided with the radiation generating unit 312 for irradiating radiation to the object, as shown in FIG. 2 . and a second frame 320 .

As an example, the radiation generator 312 may be formed in a tube shape.

The second frame 320 includes an insertion part 326 into which the rotation shaft connected to the aforementioned C-arm support part 3 is inserted.

The second frame 320 may be rotatably coupled to the C-arm support 3 shown in FIG. 1 by inserting the rotation shaft into the insertion part 326 .

The rotating unit 300 may be coupled to the arm frame 100 through the rotating unit coupling unit 110 of the arm frame 100 .

In detail, the rotating shaft of the C-arm support part 3 inserted into the insertion part 326 of the second frame 320 may be coupled to the rotating part coupling part 110 of the arm frame 100 .

In a state in which the rotation shaft is inserted into the insertion unit 326 and the second frame 320 is coupled to the C-arm support 3 , the insertion unit 326 of the second frame 320 is inserted into the rotation unit coupling unit 110 . The second frame 320 may be coupled to the arm frame 100 by coupling the rotation shaft of the C arm support 3 inserted in the .

The rotating unit 300 rotates the axis of rotation of the C-arm support unit 3 coupled to the rotating unit coupling unit 110 when power is transmitted from the output unit 200b of the driving unit 200 to the rotating unit 300 . It can be driven to rotate forward and reverse with respect to the arm frame 100 within a certain range with respect to the center.

3 is a view showing the driving unit 200 of the mammography apparatus 1 according to an embodiment of the present invention (enlarged view of part A of FIG. 2), FIG. 4 is the driving unit 200, the input unit 200a It is an exploded perspective view showing the composition of the

3 and 4 , the driving unit 200 may include a driving unit body 210 that forms the exterior of the driving unit 200 and is fixedly coupled to the arm frame 100 .

The input unit 200a of the driving unit 200 includes a first fixing unit 220 formed on an upper portion of the driving unit main body 210 , and a worm wheel driving shaft 242 of the worm gear unit 240 .

The worm gear unit 240 may be provided inside the driving unit main body 210, and includes a worm wheel (not shown) including a worm wheel driving shaft 242 and a worm shaft 244 that is rotated by meshing with the worm wheel.

In one embodiment of the present invention, the worm wheel and the worm shaft 244 may be engaged through a meshing surface formed on the outer circumferential surface, respectively, and detailed illustration and description thereof will be omitted.

The worm wheel driving shaft 242 may be coupled to the rotation shaft 262 of the motor 260 to be rotationally driven according to the power of the motor 260 .

As an example, the motor 260 may be a step motor or a servo motor capable of forward and reverse rotation driving.

When the rotating shaft 262 of the motor 260 is rotated by the power of the motor 260, the worm wheel driving shaft 242 coupled to the rotating shaft 262 of the motor 260 may also be rotated, and the worm wheel driving shaft 242. may rotate the worm wheel to rotate the worm shaft 244 meshed with the worm wheel.

3 and 4, the above-described first fixing unit 220, the outer portion 222 formed on the upper portion of the driving unit main body 210, and a recess formed on the radially inner side of the outer portion 222 ( 224).

The outer part 222 may have a substantially rectangular shape, and the recessed part 224 may be concavely recessed on the radially inner side of the outer part 222 , and may have a circular cross-section when viewed in a horizontal plane.

In addition, a hole may be formed in the inner center of the recessed portion 224 .

As shown in FIG. 4 , the rotary shaft 262 of the motor 260 and the worm wheel driving shaft 242 of the worm gear 240 may pass through the hole inside the recess 224 .

5 is a cross-sectional view in the B-B' direction (a cross-sectional view in the B-B' direction in FIG. 3 ) of the driving unit 200 .

4 and 5 , the input unit 200a of the driving unit 200 further includes a first backlash adjusting unit 250 for limiting the backlash of the worm gear unit 240 when the motor 260 rotates.

The first backlash control unit 250 is seated on the first fixing unit 220 and is seated on the first block 252 and the worm wheel driving shaft 242 through which the rotation shaft 262 of the motor 260 passes, and the motor 260 ) of the rotation shaft 262 is passed, and includes a second block 254 located on the inside of the first block (252).

As an example, the first block 252 includes a side portion 2522 coupled to the outer portion 222 , and a convex portion 2524 formed on the radially inner side of the side portion 2522 and seated in the recessed portion 224 . and a through hole 2526 formed in the inner center of the convex portion 2524 and through which the rotation shaft 262 of the motor 260 passes.

As shown in FIG. 4 , the side portion 2522 may have a substantially rectangular shape, and may support the edge of the motor 260 seated on the first block 252 as shown in FIG. 5 .

The convex portion 2524 has a circular cross-section when viewed in a horizontal plane, and a through-hole 2526 may be formed in the inner center.

As shown in FIG. 4 , the upper portion of the convex portion 2524 may be formed to be concavely recessed inside the side portion 2522 in the radial direction, and thus the protrusion 264 of the motor 260 may be seated. .

In addition, as shown in FIG. 5 , the lower portion of the convex part 2524 may be formed to protrude in the direction of the first fixing part 220 to be seated in the recessed part 224 .

4 and 5, the motor 260 is fixed to the first fixing part 220 by being fastened to the outer part 222 of the first fixing part 220 through at least one fastening member (a). can be combined.

At this time, the fastening member (a) may be vertically inserted into the outer peripheral surface of the motor (260).

Also, the fastening member (a) may pass through the side portion 2522 of the first block 252 and be coupled to the fastening point of the first fixing unit 220 .

Accordingly, the fastening member a may fix the motor 260 and the first block 252 to the first fixing unit 220 .

As an example, the fastening member (a) may be a bolt, but is not limited thereto.

As described above, the side portion 2522 of the first block 252 supports the edge of the motor 260 , and the protrusion 264 of the motor 260 may be seated on the convex portion 2524 .

Therefore, the motor 260 can be stably fixed to the first fixing unit 220 through the above-described first block 252 configuration, and thus power transmission from the motor 260 to the worm wheel drive shaft 242 is can be done stably.

4 and 5 , the first backlash adjusting unit 250 further includes a bearing 256 .

The bearing 256 may be located inside the above-described first block 252 , specifically in the through hole 2526 , in a state in which the motor 260 is coupled to the first fixing unit 220 .

In addition, the bearing 256 may be disposed on the second block 254 .

As an example, in the motor 260 described above, as shown in FIG. 5 , a stepped portion 266 may be formed in the radial direction of the protrusion 264 , and the stepped portion 266 has an upper portion of the bearing 256 . can be inserted.

A rotation shaft 262 of the motor 260 passes through the bearing 256, and the bearing 256 vertically supports the axial load applied to the rotation shaft 262 of the motor 260 when the motor 260 rotates. The rotation shaft 262 of the motor 260 may maintain its original position.

Through this, the bearing 256 minimizes the frictional force applied to the rotating shaft 262 of the motor 260 to prevent damage to the motor 260, and the rotating shaft 262 of the motor 260 smoothly with minimal frictional force. It can be supported so that it can rotate.

As an example, various types of bearings such as ball bearings and rolling bearings may be used as the bearing 256 .

The above-described second block 254 is seated on the worm wheel drive shaft 242 as shown in FIGS. 4 and 5 , and a seating portion 2542 for supporting the lower portion of the bearing 256 and the rotation shaft of the motor 260 . and a support 2544 supporting the 262 .

The second block 254 may be located inside the above-described first block 252 , specifically in the through hole 2526 , in a state in which the motor 260 is coupled to the first fixing unit 220 .

A hole is formed in the second block 254 so that the rotation shaft 262 of the motor 260 can pass, and the rotation shaft 262 of the motor 260 includes the bearing 256 and the hole of the second block 254 . It may be coupled to the worm wheel drive shaft 242 through it.

At this time, the support part 2544 is formed to surround at least a portion of the outer peripheral surface of the rotation shaft 262 of the motor 260 passing through the hole of the second block 254, and accordingly, the rotation shaft 262 of the motor 260. can support

4 and 5 , the first backlash adjusting unit 250 further includes a ring member 258 .

The ring member 258 may be located in the through hole 2526 of the first block 252 described above in a state in which the motor 260 is coupled to the first fixing part 220 .

Also, the ring member 258 may be inserted between the bearing 256 and the second block 254 .

As an example, the ring member 258 may have a hole formed in the center thereof, may have a circular cross-section when viewed in a horizontal direction, and may be formed of a metal material, but is not limited thereto.

4 and 5 , the rotation shaft 262 of the above-described motor 260 may pass through the hole of the ring member 258 .

In addition, the ring member 258 is inserted into the second block 254 by being inserted into the support portion 2544 of the second block 254 through the hole of the ring member 258 , and the seating portion of the second block 254 . 2542 may be seated.

According to the mammography apparatus 1 according to an embodiment of the present invention, power is transmitted from the motor 260 to the worm wheel driving shaft 242 , and the worm wheel may be rotated according to the driving of the worm wheel driving shaft 242 .

At this time, the worm wheel drive shaft 242 may be vertically moved up and down due to the rotational movement of the worm wheel.

Due to the upward and downward movement of the worm wheel drive shaft 242 , a gap between the mating surface of the worm wheel and the mating surface of the worm shaft 244 becomes large, and backlash may be excessively generated.

Therefore, in one embodiment of the present invention, as shown in FIGS. 4 and 5, by disposing a plurality of at least one ring member 258 between the bearing 256 and the second block 254, the occurrence of rotational movement of the worm wheel It is possible to limit (adjust) the movement of the worm wheel drive shaft 242 up and down.

On the other hand, depending on the precision of the worm gear unit 240 provided in the driving unit 200, the amount of movement up and down of the worm wheel drive shaft 242 that may occur when the worm wheel is rotated may vary.

Accordingly, the number of ring members 258 disposed between the bearing 256 and the second block 254 may be adjusted according to the amount of movement of the worm wheel drive shaft 242 up and down.

In the embodiment of the present invention, it is possible to suppress the shaking of the motor 260 by stably fixing the motor 260 to the first fixing part 220 through the configuration of the first block 252 , and the bearing 256 . Through this, the rotation shaft 262 of the motor 260 can rotate smoothly, and the bearing 256 and the ring member 258 can be stably supported through the second block 254 .

As described above, the first block 252 , the second block 254 and the bearing 256 are provided, so that the ring member 258 disposed in the driving unit 200 limits the amount of upward and downward movement of the worm wheel drive shaft 242 . When (adjusting), the adjustment can be made stably.

According to the mammography apparatus 1 according to an embodiment of the present invention, the worm wheel and the worm shaft 244 at the input unit 200a of the driving unit 200 through the configuration of the first backlash adjusting unit 250 described above. Possible backlash can be minimized, and preferably, when a low-cost worm gearbox is used, the backlash can be minimized more effectively.

Accordingly, since the vibration transmitted to the radiation generating unit 312 disposed in the rotating unit 300 is reduced, a higher quality image can be obtained from the detecting unit 5 shown in FIG. 1 .

6 is an exploded perspective view showing an exploded configuration of the output unit 200b in the driving unit 200, and FIG. 7 is a C-C' cross-sectional view of the driving unit 200 (C-C' direction cross-section in FIG. 3).

According to an embodiment of the present invention, the output unit 200b of the driving unit 200 is formed in the driving unit main body 210, as shown in FIGS. 6 and 7, and has a first height with respect to the driving unit body 210. It includes a second fixing part 230 formed in a direction perpendicular to the top 220 , a worm shaft 244 , and a second backlash adjusting part 270 .

The worm shaft 244 may be driven by meshing with the worm wheel driven by the power transmitted from the motor 260 as described above, and the above-described rotating part 300 also rotates forward and reverse according to the driving of the worm shaft 244 . can be driven

The worm shaft 244 may be coupled within the driving unit body 210 , and one end may be exposed to the outside of the driving unit body 210 through the second fixing unit 230 .

A rotation driving gear 280 may be coupled to one end of the worm shaft 244 , and the rotation driving gear 280 may be rotated according to the rotation of the worm shaft 244 .

At this time, the rotation driving gear 280 may be engaged with the rotation movement gear 324 formed in the second frame 320 of the rotation unit 300 .

In addition, the rotational drive gear 280 may transmit power generated when the motor 260 rotates while meshing with the rotational movement gear 324 to the rotational movement gear 324, and rotates according to the rotational movement of the rotational movement gear 324. The eastern part 300 may be rotated forward and backward.

As an example, the rotation drive gear 280 may be a type of spur gear, but is not limited thereto.

In an embodiment of the present invention, the second backlash adjusting unit 270 adjusts the interval between the rotational drive gear 280 and the rotational movement gear 324 to be described later when the forward and reverse rotation of the rotational unit 300 is driven. It can be configuration.

As shown in FIGS. 6 and 7 , the second backlash adjusting part 270 is at one end of the elastic member 272 and the fixing block 274 and the worm shaft 244 coupled to the second fixing part 230 . It includes an anti-slip member 276 that is coupled to the shaft.

As an example, one end 2722 of the elastic member 272 may be coupled to the driving unit main body 210 , and the other end 2724 may be coupled to the rotation driving gear 280 .

Accordingly, the elastic member 272 may be tensioned or restored according to the rotational driving of the rotational driving gear 280 using the driving unit main body 210 as a supporting point.

6 and 7, the fixing block 274 may be fixedly coupled to the second fixing part 230 by being fastened to the second fixing part 230 through at least one fastening member (b). , the worm shaft 244 may pass.

In addition, the elastic member 272 may be wound and seated on the inner circumferential surface of a hole formed inside the fixing block 274 , and may be a type of a torsion spring.

The slip prevention member 276 may be coupled to the front side of the rotation driving gear 280 as shown in FIGS. 6 and 7 , and may be a type of a shrink disc.

The slip prevention member 276 prevents the rotational drive gear 280 from slipping when the rotational drive gear 280 is driven, and allows the power transmission from the rotational drive gear 280 to the rotational movement gear 324 to be precisely performed. can

8 is a view showing a state in which the arm frame 100 and the rotating unit 300 of the mammography apparatus 1 according to an embodiment of the present invention are coupled, and FIG. 9 is a partially enlarged view of FIG. 8 (FIG. 8, an enlarged view of part D).

2, 8 and 9 , the rotation unit 300 further includes an insertion hole 322 into which the rotation drive gear 280 is inserted.

The insertion hole 322 may be provided in the second frame 320 , and may be formed inside the second frame 320 as shown in FIGS. 2 , 8 and 9 .

As an example, the insertion hole 322 may be formed as an arc-shaped space inside the second frame 320 .

In the insertion hole 322, the rotational movement gear 324 meshing with the aforementioned rotational drive gear 280 may be fixedly coupled.

The aforementioned insertion hole 322 may be formed in an empty shape.

Accordingly, when the rotational movement gear 324 is rotationally moved by the driving of the rotational drive gear 280 inserted into the insertion hole 322, the rotational drive of the rotational part 300, specifically the second frame 320) Accordingly, the inside of the second frame 320 and the rotation driving gear 280 fixed to the arm frame 100 may not interfere.

On the other hand, the rotation unit 300 may be provided with a separate rotation angle limiting means (not shown) connected to the rotation movement gear 324 in the second frame 320 .

As an example, the rotation angle limiting means may limit the maximum rotation angle of the second frame 320 by limiting the maximum rotation movement distance of the rotation movement gear 324 during forward and reverse rotation of the rotation unit 300 .

In an embodiment of the present invention, the second frame 320 of the rotating unit 300 may be coupled to the arm frame 100 through the rotating unit coupling unit 110 as described above.

In addition, the second frame 320 of the rotation unit 300 is rotated when power is transmitted from the output unit 200b of the driving unit 200 to the rotation movement gear 324 through the rotation drive gear 280 . According to the rotational movement of the gear 324, the rotational axis of the C-arm support part 3 coupled to the rotational part coupling part 110 can be rotated as a center of rotation to rotate forward and reverse with respect to the arm frame 100 within a certain range. there is.

Meanwhile, the driving unit 200 may be fixed to the arm frame 100 as described above.

Accordingly, even if the rotation drive gear 280 is driven by the power generated through the motor 260 and the rotation unit 300 is rotationally driven, the driving unit 200 may maintain a state fixed to the arm frame 100 .

Accordingly, in a state in which the driving unit 200 is fixed to the arm frame 100 , only the rotational movement gear 324 may be rotationally moved by power transmission from the rotational drive gear 280 .

10 is a view showing the driving of the rotating unit 300 when power is transmitted from the driving unit 200 .

Here, FIG. 10 is a view of the mammography apparatus 1 of the present invention viewed from the direction in which the detection unit 5 and the lifting unit 6 shown in FIG. 1 are arranged, C arm support unit 3, irradiation unit 4 , the detection unit 5, the lifting unit 6, and the illustration of the compression band 7 are omitted.

And, in the state of FIG. 10 , the arm frame 100 does not rotate with respect to the C-arm support part 3 and maintains a fixed state, and only the rotation part 300 rotates with respect to the arm frame 100 .

In addition, Fig. 10 (a) is a view showing a state when the rotating unit 300 is rotated forward (clockwise rotation) with respect to the arm frame 100, Fig. 10 (b) is the rotating unit 300 It is a view showing a state positioned in the correct position with respect to the arm frame 110 , and FIG. 10 ( c ) is a state when the rotating part 300 is reversely rotated (rotated counterclockwise) with respect to the arm frame 100 . is a diagram showing

As an example, when the motor 260 rotates forward, the second frame 320 of the rotation unit 300 rotates forward (rotates clockwise), and when the motor 260 rotates reversely, the The second frame 320 may be reversely rotated (rotated counterclockwise), but is not limited thereto, and vice versa.

According to the mammography apparatus 1 according to an embodiment of the present invention, the power generated from the motor 260 is transmitted to the rotational drive gear 280 through the worm wheel and the worm shaft 244 of the worm gear unit 240 . The rotation driving gear 280 may be rotated.

And, the second frame 320 of the rotation unit 300 can be rotated forward and reverse while the rotation movement gear 324 meshing with the rotation drive gear 280 is rotated by the rotation of the rotation drive gear 280. there is.

On the other hand, when the second frame 320 of the rotating unit 300 is rotated forward or reverse with the rotation axis of the C-arm support unit 3 coupled to the rotating unit coupling unit 110 as the rotation center, the rotating unit 300 Due to its own weight and rotational torque generated in rotational movement, a gap between the mating surface of the rotational drive gear 280 and the mating surface of the rotational movement gear 324 is increased, and excessive backlash may be generated.

Therefore, in one embodiment of the present invention, when the second frame 320 of the rotating part 300 is driven in forward and reverse rotation using the elastic force of the above-described elastic member 272 , the rotational drive gear 280 and the rotational movement gear A structure that minimizes backlash may be employed by adjusting the interval between the 324 .

In an embodiment of the present invention, when the second frame 320 of the rotating unit 300 is driven to rotate forward and backward by the power transmitted from the driving unit 200, the elastic member shown in FIGS. 6 and 7 ( 272 may be tensioned to impart an elastic force to the second frame 320 of the rotating unit 300 .

In detail, when the motor 260 of the driving unit 200 rotates forward as shown in FIG. The rotation movement gear 324 may be driven in a forward rotation direction (moved in a clockwise direction).

At this time, as described above, the driving unit 200 may be fixed to the arm frame 100 .

According to the forward rotational driving of the above-described rotational shifting gear 324 , the rotation unit 300 may be rotated forward (clockwise rotation) in the direction of gravity as shown in FIG. 10( a ).

The elastic member 272 is, when the second frame 320 of the rotation unit 300 is driven to rotate forward in the gravity direction by the forward rotation of the rotation drive gear 280 in the state of Fig. 10 (a), the rotation unit ( It may be tensioned in the forward rotation direction of the second frame 320 of 300 .

At this time, the elastic member 272 may be tensioned in the forward rotation direction of the second frame 320 according to the forward rotation driving of the rotation driving gear 280 using the driving unit body 210 as a supporting point. Accordingly, elastic force is applied to the second frame 320 of the rotating unit 300 through the tensioned elastic member 272 to cancel the load and rotational torque of the rotating unit 300 .

Accordingly, when the second frame 320 of the rotating unit 300 is driven for forward rotation by the above-described configuration, the load and rotational torque of the rotating unit 300 can be offset through the elastic force of the tensioned elastic member 272 . there is.

Accordingly, by adjusting the interval between the rotational drive gear 280 and the rotational movement gear 324 (close between the rotational drive gear 280 and the rotational movement gear 324), the rotational drive gear 280 and the rotational movement Backlash that may occur between the gears 324 may be minimized.

In addition, it is possible to minimize the shaking that may be generated when the rotating part 300 is rotated.

Meanwhile, when the motor 260 of the driving unit 200 is reversely rotated as shown in FIG. The gear 324 may be driven in reverse rotation (moved in a counterclockwise direction).

According to the reverse rotation driving of the rotation movement gear 324 , the rotation unit 300 may be rotated counterclockwise (rotated counterclockwise) in the direction of gravity as shown in FIG. 10( c ).

Here, the elastic member 272 is rotated when the second frame 320 of the rotating unit 300 is reversely driven in the direction of gravity by the reverse rotation of the rotation driving gear 280 in the state of FIG. It may be tensioned in the reverse rotation direction of the eastern part 300 .

In this case, the elastic member 272 may be tensioned in the reverse rotation direction of the second frame 320 according to the reverse rotation driving of the rotation driving gear 280 using the driving unit body 210 as a supporting point.

Accordingly, an elastic force is applied to the rotating part 300 through the tensioned elastic member 272 to cancel the load and rotational torque of the rotating part 300 .

Even when the rotating unit 300 is rotated in reverse, as in the case where the rotating unit 300 is rotated forward, the gap between the rotating drive gear 280 and the rotating moving gear 324 through the above-described elastic member 272 is reduced. By adjusting (between the rotation drive gear 280 and the rotation movement gear 324 in close contact), backlash that may occur between the rotation drive gear 280 and the rotation movement gear 324 can be minimized.

In addition, it is possible to minimize the shaking that may be generated when the rotating part 300 is rotated.

On the other hand, as shown in FIGS. 10(a) and 10(c), when the rotating part 300 that has been rotated forward or reverse is returned to the original position (original position) as shown in FIG. 10(b), The tensioned elastic member 272 may also be restored to its original state.

At this time, the elastic member 272 is restored to its original state along the rotational direction of the rotating unit 300 using the driving unit body 210 as a supporting point to impart an elastic force to the second frame 320 of the rotating unit 300 . The return to the original position of the second frame 320 of the rotating part 300 by the restoring force of the elastic member 272 may be stably performed.

In addition, by adjusting the interval between the rotary drive gear 280 and the rotary drive gear 324 through the restoring force of the elastic member 272 generated when the elastic member 272 is restored to its original state (rotation drive gear 280) ) and the rotational movement gear 324), even when the rotational part 300 is returned to its original position, it is possible to minimize the backlash that may occur between the rotational drive gear 280 and the rotational movement gear 324. .

Accordingly, even when the rotating unit 300 is returned to its original position, it is possible to minimize shaking that may occur when the rotating unit 300 rotates.

Through the configuration of the elastic member 272 of the second backlash adjusting unit 270 described above, backlash that may be generated when the rotating unit 300 is rotated is minimized, and within the first frame 310 of the rotating unit 300 . By reducing the vibration transmitted to the disposed radiation generator 312 , it is possible to obtain a higher quality image from the detector 5 .

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains may make various modifications, changes and substitutions within the scope without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1: Mammography device
2: C arm
100: arm frame
200: drive unit
200a: input
200b: output
220: first fixing part
230: second fixing part
240: worm gear unit
250: first backlash control unit
260: motor
270: second backlash control unit
280: rotation drive gear
300: rotating part
324: rotation movement gear

Claims (19)

an arm frame that is provided on the C arm of the mammography device and is coupled to a rotation shaft connected to the C arm support of the mammography device;
a driving unit coupled to the arm frame, the driving unit including a worm gear unit driven according to the rotation of the motor and a rotation driving gear rotating according to the driving of the worm gear unit;
a rotation unit coupled to the arm frame and driven to rotate within a predetermined range according to the driving of the rotation drive gear around the rotation shaft; and
and a second backlash adjusting part for adjusting a distance between the rotational driving gear and the rotational driving gear formed in the rotational part to mesh with the rotational driving gear when the rotational part is rotated. Anti-backlash structure of mammography device. The method of claim 1,
Backlash prevention structure of the mammography apparatus, characterized in that it further comprises a first backlash control unit for limiting the backlash of the worm gear portion when the motor rotates. 3. The method of claim 1 or 2,
The driving unit includes a driving unit body fixedly coupled to the arm frame and having the worm gear unit therein,
The worm gear unit is provided in the driving unit main body, the backlash prevention structure of the mammography apparatus, characterized in that it comprises a worm wheel including a worm wheel drive shaft coupled to the rotation shaft of the motor and a worm shaft to be rotated by meshing with the worm wheel. 4. The method of claim 3,
The driving unit,
It is formed on the main body of the driving unit, the motor is coupled, and further comprising a first fixing unit through which the rotating shaft of the motor and the worm wheel driving shaft pass,
The first fixing part,
an outer portion formed on the upper portion of the driving unit body;
Including a depression formed concavely on the inside of the outer part,
The anti-backlash structure of the mammography apparatus, characterized in that the worm wheel drive shaft passes through the hole inside the recess. 5. The method of claim 4,
The first backlash adjusting unit,
a first block seated on the first fixing part and through which the rotating shaft of the motor passes;
a second block seated on the worm wheel drive shaft, through which the rotation shaft of the motor passes, and located inside the first block;
A bearing disposed on the second block, through which the rotation shaft of the motor passes, and positioned inside the first block; and
at least one ring member inserted between the bearing and the second block and limiting the vertical movement of the worm wheel drive shaft when the rotation shaft of the motor is rotated;
The number of the ring member is a backlash preventing structure of the mammography apparatus, characterized in that adjusted according to the vertical movement amount of the worm wheel drive shaft. 6. The method of claim 5,
The first block is
a side portion coupled to the outer portion;
a convex part formed on the inside of the side part and seated in the recessed part; and
It is formed on the inside of the convex part, and includes a through hole through which the rotation shaft of the motor passes,
The second block and the bearing are anti-backlash structure of the mammography apparatus, characterized in that located in the through hole in a state in which the motor is coupled to the first fixing part. 7. The method of claim 6,
The motor is
a protrusion seated on the convex portion; and
Including a stepped portion formed on the radially inner side of the protrusion,
The anti-backlash structure of the mammography apparatus, characterized in that the upper portion of the bearing is inserted into the stepped portion. 6. The method of claim 5,
The second block is
a seating portion that is seated on the worm wheel drive shaft and supports a lower portion of the bearing; and
Backlash prevention structure of the mammography apparatus, characterized in that it comprises a support for supporting the rotation shaft of the motor. 9. The method of claim 8,
The ring member has a hole formed in the center, and the rotation shaft of the motor passes through the hole of the ring member,
The ring member is inserted into the second block by being inserted into the support portion through the hole of the ring member, and anti-backlash structure of the mammography apparatus, characterized in that it is seated in the seating portion. delete delete 4. The method of claim 3,
The rotation drive gear is
The anti-backlash structure of the mammography apparatus coupled to the worm shaft, characterized in that rotated according to the rotation of the worm shaft. 4. The method of claim 3,
The driving unit,
Formed on the driving unit main body, the anti-backlash structure of the mammography apparatus, characterized in that it further comprises a second fixing part through which the worm shaft passes. 14. The method of claim 13,
The second backlash adjusting unit,
an elastic member having one end coupled to the driving unit main body and the other end coupled to the rotation driving gear;
a fixing block on which the elastic member is seated and coupled to the second fixing part, through which the worm shaft passes;
The anti-backlash structure of the mammography apparatus characterized in that it is coupled to the front side of the rotational drive gear, is shaft-coupled to the worm shaft, and includes a slip prevention member for preventing slip of the rotational drive gear. 15. The method of claim 14,
When the rotating part is rotationally driven within a certain range, the elastic member is tensioned to impart an elastic force to the rotating part,
When the rotating part is returned to its original position, the elastic member is restored to provide an elastic force to the rotating part. 16. The method of claim 15,
When the rotating part is rotationally driven within a certain range, the elastic member is tensioned in the rotational direction of the rotating part using the driving unit body as a supporting point to adjust the interval between the rotational drive gear and the rotational movement gear,
When the rotating part is returned to its original position, the elastic member is restored along the rotational direction of the rotating part using the driving unit body as a supporting point to adjust the distance between the rotational drive gear and the rotational movement gear Mammo, characterized in that Anti-backlash construction of a graphic device. The method of claim 1,
The rotating part,
A first frame provided with a radiation generator for irradiating radiation to an object;
a second frame vertically coupled to an end of the first frame and having the rotational shifting gear therein;
It is provided in the second frame and includes an insertion hole into which the rotation drive gear is inserted,
The rotation movement gear is a backlash prevention structure of the mammography apparatus, characterized in that formed in the insertion hole. 18. The method of claim 17,
The second frame includes an insert into which the rotation shaft is inserted,
The anti-backlash structure of the mammography apparatus, characterized in that the rotation shaft inserted into the insertion part is coupled to the rotating part coupling part of the arm frame to couple the second frame to the arm frame. 19. The method of claim 18,
When the rotation drive gear is driven, the second frame is rotationally driven with respect to the arm frame with the rotation shaft coupled to the rotation unit coupling part as a rotation center,
The driving unit anti-backlash structure of the mammography apparatus, characterized in that when the rotating unit is driven to rotate, it maintains a fixed state to the arm frame.

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