JPH0579516A - Joint for eccentricity adjustment - Google Patents

Abstract

PURPOSE:To facilitate accurate eccentricity adjustment without the use of an exclusive jig, tool, and the like, by relatively moving a cylindrical part and a loosely inserted part in both the X, Y axis directions so as to cancel their eccentric condition, then regulating the movement and fixing the positional relation of both. CONSTITUTION:At adjusting eccentricity between the axis of a prime moving shaft 21 and the axis of a driven shaft 22, at first a third adjusting vis 28 is rotated in the unscrewing direction so as to sufficiently separate the extreme end from a loosely inserted part 24. Next, a first adjusting vis 26 is rotated in the screwing direction so as to cancel eccentricity in the X-axis direction. Next, a second adjusting vis 27 is similarly rotated in the screwig direction so as to cancel eccentricity in the Y-axis direction. Finally, the third adjusting vis 28 is rotated in the screwing direction so as to fix the relation of positions. In this way, the axis of the prime moving shaft 21 and the axis of the driven shaft 22 are aligned. Hereby, adjustment of eccentric condition in the X-axis direction and the Y-axis direction can be individually performed without mutual influence, and accurate adjustment of eccentricity is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a joint for connecting a rotary shaft of a rotary hologram scanner and a disk having a hologram diffraction grating plate mounted thereon, and an eccentricity adjustment capable of adjusting eccentricity of both shaft centers. The present invention relates to a fitting.

[0002]

2. Description of the Related Art In a fixed joint for connecting a pair of abutting rotating bodies, it is necessary to match the axes of both rotating bodies with each other while keeping the axes parallel to each other. Such a so-called eccentric state is eliminated. As an adjusting device for doing so, for example, the one described in JP-A-56-52622 is known.

As shown in FIG. 9, this adjusting device is applied to a bearing whose eccentricity can be adjusted.
And the bearing body 61, an intermediate member 71 is interposed. The intermediate member 71 includes a tubular portion 72 having a small diameter and a flange portion 73 fixed to one end surface of the tubular portion 72. The flange portion 73 is screwed and fixed to the chassis 52. .. This screwing is performed by tightening the fixing screw 74 inserted into the plurality of long grooves 73a formed in the circumferential direction of the flange portion 73.
By loosening, the intermediate member 71 can rotate with the long groove 73a as a guide. The tubular portion 72 has an eccentric hole 72.
a is penetratingly formed, and the rotary shaft 51 is inserted into the eccentric hole 72a from the flange portion 73 side.

On the other hand, the bearing body 61 has a thick cylindrical portion 62.
And the flange portion 6 fixed to one end surface of the tubular portion 62.
3 and is fixed to the intermediate member 71 by screws at the flange portion 63. Further, a plurality of long grooves 63a are formed in the circumferential direction of the flange portion 63, and the fixing screw 64 inserted into the long grooves 63a allows the bearing main body 6 to the intermediate member 71.
1 can be fixed and tightened and rotated. Tubular part 6
An eccentric hole 62a is formed through the eccentric hole 62a, and the cylindrical portion 7 of the intermediate member 71 is inserted into the eccentric hole 62a from the flange portion 63 side.
2 is inserted.

In such a structure, the bearing body 61 and the intermediate member 71 are appropriately rotated when two arbitrary directions orthogonal to each other are defined as the X-axis direction and the Y-axis direction in a plane orthogonal to the axial direction. By doing so, it is possible to move in both X and Y axis directions, that is, to adjust the eccentricity between the rotary shaft 51 and the bearing body 61. Further, the two flange portions 63, 73 are abutted with each other so that the rotary shaft 51 orthogonal to this is formed.
And the parallel state of each axis of the bearing main body 61 is maintained.

[0006]

In the above-mentioned conventional example, since the bearing body 61 and the intermediate member 71 can be rotated by being guided by the long holes 63a and 73a, respectively, continuous eccentricity adjustment is possible. However, the bearing body 61 and the intermediate member 7
Either one of the rotations of 1 and 1 causes displacement including both components in the X-axis direction and the Y-axis direction. Therefore, it is necessary to rotate the bearing body 61 and the intermediate member 71 at the same time to adjust the eccentricity, which requires considerable experience in the adjustment operation. Moreover, since adjustment is performed via the intermediate member 71,
If the fitting accuracy between the rotary shaft 51 and the intermediate member 71 or between the intermediate member 71 and the bearing body 61 is insufficient, a delicate shaft will be produced when the intermediate member 71 and the bearing body 61 are finally fixed. It was not suitable for high-precision adjustment because it caused misalignment. Moreover, the turning operation requires a special tool and a special jig, which makes the adjustment complicated.

The present invention has been made to solve the drawbacks of the prior art, and provides a joint for eccentricity adjustment that can easily perform highly accurate eccentricity adjustment without using a dedicated jig, tool or the like. The purpose is to do.

[0008]

In order to achieve the above object, the present invention relatively moves a first rotating body and a second rotating body which are butted to each other while keeping their axes parallel to each other. In the eccentricity adjustment joint that eliminates the eccentricity state by
Alternatively, a cylindrical portion coaxially provided at a connecting end of one of the second rotating bodies and having a first parallel restricting surface orthogonal to the axis and a connecting portion of the other rotating body is coaxial. It has a second parallel restricting surface which is provided on the upper side and is orthogonal to the axis, and is loosely inserted into the tubular portion, and is interposed between the tubular portion and the loose insertion portion, and these are inserted into the axial center. The moving means for relatively moving in a direction orthogonal to the first parallel regulating surface and the second parallel regulating surface are brought into close contact with each other, so that the axes of the first rotating body and the second rotating body are parallel to each other. And a parallel maintaining unit for maintaining the first moving unit and the moving unit, when two arbitrary directions orthogonal to each other in a plane orthogonal to the axial center directions of both rotating bodies are respectively defined as the X-axis direction and the Y-axis direction, And the second rotating body,
A first moving means capable of relatively moving in the X-axis direction, a second moving means capable of relatively moving the first rotating body and the second rotating body in the Y-axis direction, and first and second It is characterized by having a movement restricting means capable of simultaneously blocking relative movement of the rotating body in the X-axis direction and the Y-axis direction.

In this case, the moving means includes a first moving means arranged on the X-axis passing through the axis and a first moving means arranged on the Y-axis passing through the axis at an angle of 90 °. 2 means of transportation,
It is composed of a third moving means arranged on a line that bisects the residual angle, and each of these moving means is an adjusting screw which is screwed into the tubular portion and whose tip is brought into contact with the loose insertion portion. Alternatively, it is preferable that each of these moving means is an adjustment screw that is screwed into the loose insertion portion and has its head in contact with the tubular portion.

[0010]

According to the structure of the present invention, the first moving means relatively moves the tubular portion and the loose insertion portion in the X-axis direction to eliminate the eccentric state in the X-axis direction and the second moving means. The tubular portion and the loose insertion portion are relatively moved in the Y-axis direction to eliminate the eccentric state in the Y-axis direction, and the movement restricting means regulates the relative movement of the tubular portion and the loose insertion portion, so that the positional relationship between them is eliminated. To fix. At this time, the parallel maintaining means always maintains the parallel state of the first rotating body and the second rotating body. That is, the first rotating body and the second rotating body
And the rotator are respectively moved in parallel via the tubular portion and the loose insertion portion, and at that time, the eccentric state in the X-axis direction and the eccentric state in the Y-axis direction are individually adjusted.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an example in which the eccentricity adjusting joint according to the first embodiment is applied to a rotary hologram scanner, and FIG.
It is an A line sectional view.

In the rotary hologram scanner, the disk 1
A mounting accuracy of about several μm in the radial direction is required between the hologram diffraction grating plate 2 and the rotating shaft 3 mounted on. That is, when the disk 1 as a rotating body and the rotating shaft 3 are connected to each other, it is necessary to adjust the eccentricity of the shaft center between them with an accuracy of several μm. As shown in FIG. 1, a cylindrical member (cylindrical portion) 4 having a flange portion 5 on the back side is screwed and fixed to the donut-shaped disc 1.

On the other hand, a columnar member (slowly inserting portion) 6 having a flange portion 7 is press-fitted and fixed to the rotary shaft 3 at the end on the disk 1 side, and is integrally formed by a motor 8 connected to the base end of the rotary shaft 1. It is designed to be rotated. The columnar member 6 is adapted to be loosely inserted from the disc 1 side into the hollow portion 4a of the cylindrical member 4, and the flange portion 7 thereof has a circular hole portion 1 of the disc 1.
The peripheral portion of the back surface 7a is loosely inserted into a and is brought into close contact with the front surface 5a of the flange portion 5 of the cylindrical member 4. That is, the back surface 7a of the flange portion 7 of the columnar member 6 and the front surface 5a of the flange portion 5 of the cylindrical member 4 respectively constitute parallel regulating surfaces that are surfaces orthogonal to the axis, and both surfaces are brought into close contact with each other. The parallelism of the axes of the cylindrical member 4 and the cylindrical member 6 can be maintained.

This close contact is caused by the cylindrical member 4 with respect to the cylindrical member 6.
Is performed by the parallel maintaining means for urging the coil spring 9 that contacts the end of the cylindrical member 4 on the motor 8 side.
And the cylindrical member 6 for receiving the coil spring 9.
And a circular plate 10 fixed to the motor 8 side by screwing. Therefore, regarding the cylindrical member 6 and the cylindrical member 4, the flange portion 5 of the cylindrical member 4 is the circular hole portion 1 of the disc 1.
Within the range regulated by a, relative movement is possible while maintaining the parallel state.

As shown in FIG. 2, the cylindrical member 4 has screws when the arbitrary two directions are respectively defined as the X-axis direction and the Y-axis direction in the cross-sectional direction, that is, in the plane orthogonal to the axial direction. The holes 4b are formed at a position separated by 90 ° in the X and Y axis directions and at a position that bisects the residual angle side (a position at an angle of 135 ° in the clockwise / counterclockwise direction). .. These screw holes 4b, 4b, 4
In b, a first adjusting screw 11 which is a first moving means facing the X-axis direction and a second adjusting screw 11 which is a second moving means facing the Y-axis direction.
Adjustment screw 12 and third adjustment screw 13 which is a movement restricting means
And are respectively loosely inserted. The edge of each screw hole 4b is a cut surface 4c, and each adjustment screw 11, 12, 1
The lower surface of the head of 3 (actually the lower surface of the washer) comes into close contact with the cut surface 4c and acts as a reaction force receiving or stopper when the adjusting screws 11, 12, 13 are screwed in. Each adjusting screw 11, 12, 13 is formed of a countersunk screw, and a washer 14 and a washer 15 for preventing loosening are incorporated. On the other hand, in the cylindrical member 6, the screw holes 4 of the cylindrical member 4 are formed.
Screw holes 6a into which the adjusting screws 11, 12, and 13 are screwed are formed at positions corresponding to b. Therefore, the adjustment screws 11, 12, and 13 have the same shape as the cylindrical member 6
The cylindrical member 6 is relatively pulled toward the cylindrical member 4 side by being screwed into the screw hole 6a.

Here, the procedure for adjusting the eccentricity between the axis of the disk 1 and the axis of the rotary shaft 3 will be described with reference to FIGS. In the eccentricity adjustment, either one or both of the disc 1 and the rotary shaft 3 may be moved.
That is, it suffices that the two are relatively moved, but here, in order to make the explanation easy to understand, the rotating shaft (cylindrical member 6) 3 is considered to be the fixed side, and the disc (cylindrical member 4) 1
Will be explained as the moving side.

As shown in FIG. 3, it is assumed that the axis P of the disk 1 is eccentric to the axis O of the rotary shaft 3 by + ΔX in the X-axis direction and −ΔY in the Y-axis direction. First,
In order to eliminate the eccentricity in the X-axis direction, the first adjustment screw 11 in the X-axis direction is rotated in the loosening direction, the screwing amount of the first adjustment screw 11 into the screw hole 6a is made shallow by ΔX, and the cut surface 4c is formed.
Therefore, the first adjusting screw 11 is lifted by ΔX (FIG. 4). Subsequently, the third adjusting screw 13 is rotated in the tightening direction to eliminate the floating of the first adjusting screw 11 (FIG. 5). At this point, the cylindrical member 4 is moved by −ΔX in the X-axis direction with respect to the cylindrical member 6, and the eccentricity in the X-axis direction is eliminated. Next, in order to eliminate the eccentricity in the Y-axis direction, the second adjusting screw 12 in the Y-axis direction is rotated in the loosening direction,
The screwing amount of the second adjusting screw 12 into the screw hole 6a is shallowed by ΔY, and the second adjusting screw 12 is lifted by ΔY from the cut surface (FIG. 6). Finally, the third adjusting screw 13 is rotated in the tightening direction to move the second adjusting screw 12
Eliminate the rise of. (Fig. 7). At this time, the cylindrical member 4 is moved by + ΔY in the Y-axis direction with respect to the cylindrical member 6,
The eccentricity in the axial direction is eliminated. In this way, the eccentric state of + ΔX in the X-axis direction and −ΔY in the Y-axis direction is eliminated, and the axis P of the cylindrical member (rotation shaft 3) 6 has the axis P of the cylindrical member (disk 1) 4. It will be in a matched state.

As described above, the adjusting screws 11, 12, 13
Are arranged in three directions, that is, a position separated by 90 ° in the X and Y axis directions and a position that bisects the residual angle side, so that the eccentricity adjustment in the X axis direction can be performed by the first adjustment screw 11. The second adjusting screw 12 enables the eccentricity adjustment in the Y-axis direction, and the third screw 13 allows the positional relationship to be fixed.
As described above, since the eccentricity adjustments in the X and Y axis directions are individually and directly performed, the eccentricity adjustments can be extremely easily performed, and the Y axis direction is not displaced along with the displacement in the X axis direction. Moreover, the X-axis direction is not displaced along with the Y-axis direction displacement. Therefore, highly accurate eccentricity adjustment is possible.

FIG. 8 is a structural diagram of a general joint for adjusting eccentricity according to the second embodiment. As shown in the figure, the eccentricity adjusting joint in this embodiment connects a driving shaft 21 on the right side as a rotating body and a driven shaft 22 on the left side in the drawing, and is fixed to the coupling end of the driving shaft 21. And a loose member 24 at the connecting end of the driven shaft 22.
It has and. The cylindrical member 23 has a flange 25 at the end on the drive shaft 21 side, and is fixed coaxially to the drive shaft 21 at the flange 25. On the other hand, the loose insertion part 24
Is the first grinding surface 2 that meets at a right angle to the peripheral surface of the end of the driven shaft 22.
4a and the second grinding surface 24b are formed,
The first ground surface 24a is made orthogonal to the X-axis direction, and the second ground surface 2
4b is inserted into the cylindrical member 23 so as to be orthogonal to the Y-axis direction. Further, this insertion is performed such that the tip of the loose insertion portion 24 abuts on the flange 25 of the cylindrical member 23,
Further, the loose insertion portion 24 and the flange 25 are provided by a biasing means (not shown).
And are relatively urged in the direction in which they come into contact with each other. By this biasing, the surface 25a of the flange 25 orthogonal to the axis of the driving shaft 21 and the loose insertion portion 24 orthogonal to the axis of the driven shaft 22.
The tip end surface 24c of the above is closely contacted with each other so that the parallelism between the axes of the both is maintained.

In the cylindrical member 23, as shown in FIG. 8 (a), the screw holes 23a are separated by 90 ° in the X and Y axis directions in the sectional direction, that is, in the plane orthogonal to the axial direction. And a position that bisects the residual angle side (a position at an angle of 135 ° clockwise and counterclockwise from that position). These screw holes 23a, 23
The first adjustment screw 26 located in the X-axis direction is provided on a and 23a.
The second adjusting screw 27 located in the Y-axis direction and the third adjusting screw 28, which is the movement restricting means, are screwed together. Then, the tip end of the first adjustment screw 26 contacts the first ground surface 24a of the loose insertion part 24, and the second adjustment screw 2
The tip of 7 contacts the second grinding surface 24b, and the third adjusting screw 2
The tip of 8 abuts on the arc surface. Therefore, the adjustment screws 26, 27, 28 are screwed into the screw holes 23a of the cylindrical member 23 so that the tips of the adjustment screws 26, 27, 28 are brought into contact with the loose insertion portion 24, and the loose insertion portion 24 is relatively moved from the cylindrical member 23 side. It acts to pull them apart.

In this case, the shaft center of the driving shaft 21 and the driven shaft 22
The procedure for adjusting the eccentricity with the shaft center of the first embodiment will be briefly described by taking the case of the first embodiment as an example. First, the third adjusting screw 28 is rotated in the loosening direction, and the tip thereof is sufficiently removed from the loose inserting portion 24. Keep it away. Next, the first adjusting screw 26 is rotated in the tightening direction to eliminate the eccentricity in the X-axis direction. Then, the second adjusting screw 27 is similarly rotated in the tightening direction to eliminate the eccentricity in the Y-axis direction. Finally, the third adjusting screw 28 is rotated in the tightening direction to fix the positional relationship between them. In this way, the axis of the driving shaft 21 and the axis of the driven shaft 22 are aligned.

In the second embodiment, the operation procedure is the same as that of the first embodiment, although the operation procedure is slightly different from that of the first embodiment.
It will be effective.

In the above description, the adjustment screws are described as existing on the same plane, but they do not necessarily have to be on the same plane, and the parallel state of the rotating body to be adjusted is always maintained. Therefore, it suffices if it can be displaced in a desired direction. Further, if the third adjusting screw is provided with an urging means such as a coil spring, the adjusting operation becomes easier.

[0024]

As described above, according to the present invention, the first moving means capable of relative movement in the X-axis direction, the second moving means capable of relative movement in the Y-axis direction, and the first rotating body. The eccentric state of the first rotating body and the second rotating body is adjusted by the movement restricting means capable of simultaneously blocking the relative movement of the second rotating body in the X axis direction and the Y axis direction. Therefore, the eccentric state in the X-axis direction and the eccentric state in the Y-axis direction can be individually adjusted without affecting each other, and the eccentricity can be easily adjusted with high accuracy.

[Brief description of drawings]

FIG. 1 is a half-cut side view of an eccentricity adjustment joint according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a first step of an eccentricity adjustment procedure of the embodiment.

FIG. 4 is a sectional view showing a second step of the eccentricity adjustment procedure of the embodiment.

FIG. 5 is a sectional view showing a third step of the eccentricity adjustment procedure of the embodiment.

FIG. 6 is a sectional view showing a fourth step of the eccentricity adjustment procedure of the embodiment.

FIG. 7 is a cross-sectional view showing a fifth step of the eccentricity adjustment procedure of the embodiment.

FIG. 8 is a structural diagram of an eccentricity adjusting joint according to a second embodiment of the present invention.

FIG. 9 is a configuration diagram of a conventional example according to JP-A-56-52622.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc, 3 ... Rotating shaft, 4 ... Cylindrical member, 5 ... Flange part, 5a ... Surface, 6 ... Cylindrical member, 7 ... Flange part, 7
a ... back surface, 9 ... coil spring, 11 ... first adjustment screw, 12 ... second adjustment screw, 13 ... third adjustment screw, 21 ...
Driving shaft, 22 ... Driven shaft, 23 ... Cylindrical member, 24 ... Loose insertion part, 24a ... Tip surface, 25 ... Flange, 25a ... Surface,
26 ... 1st adjustment screw, 27 ... 2nd adjustment screw, 28 ... 3rd
Adjustment screw, O, P ... Shaft center.

Claims (3)

[Claims] 1. An eccentricity adjusting joint for eliminating an eccentricity state by relatively moving a first rotating body and a second rotating body, which are butted against each other, while maintaining their axes parallel to each other. A cylindrical portion coaxially provided at a connecting end of one of the first and second rotating bodies and having a first parallel regulating surface orthogonal to the axis, and a connecting end of the other rotating body. Is provided coaxially and has a second parallel regulating surface orthogonal to the axis, and is loosely inserted into the tubular portion, and is interposed between the tubular portion and the loose insertion portion. The first rotating body and the second rotating body are brought into close contact with the moving means for relatively moving them in the direction orthogonal to the axis and the first parallel regulating surface and the second parallel regulating surface. Parallel maintaining means for maintaining the parallel state of the axis of the second rotating body, the moving means When the arbitrary two directions orthogonal to each other in the plane orthogonal to the axial direction of the body are defined as the X-axis direction and the Y-axis direction, respectively, the first rotary body and the second rotary body are connected to the X-axis. First moving means capable of relatively moving in a direction, second moving means capable of relatively moving the first rotating body and the second rotating body in the Y-axis direction, the first and the second An eccentricity adjustment joint characterized in that it has a movement restricting means capable of simultaneously blocking relative movements of the two rotating bodies in the X-axis direction and the Y-axis direction. 2. The moving means is arranged on the Y-axis passing through the axis and the first moving means arranged on the X-axis passing through the axis, and at an angle of 90 ° with respect to the first moving means. The second moving means and the third moving means arranged on a line that divides the residual angle into two parts. Each of the moving means is screwed into the tubular portion, and the distal end thereof is loosely inserted. The eccentricity adjustment joint according to claim 1, wherein the adjustment screw is an abutment screw that abuts against the portion. 3. The moving means is arranged on the Y-axis passing through the axis and the first moving means arranged on the X-axis passing through the axis, and at an angle of 90 ° with respect to the first moving means. The second moving means and the third moving means arranged on the line dividing the residual angle into two parts. Each of the moving means is screwed into the loose insertion portion, and the head is moved into the cylinder. The eccentricity adjusting joint according to claim 1, wherein the adjusting screw is an abutment screw that is brought into contact with the shaped portion.