JP2017218800A - Centering tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centering tool capable of aligning a central axis of a hollow part having a circular opening with a central axis of a cylindrical member.SOLUTION: A centering tool includes: a first arm 11 and a second arm 12 of an equal length that swing within a respective prescribed angular range; a first joint 15 linking the first arm 11 with the second arm 12 swingably and provided with a center of swing; a pair of outside engaging bodies 21A, 21B with an interval therebetween changing along with a swinging motion of the first arm 11 and the second arm 12, the pair of outside engaging bodies being provided at positions in point symmetry with regard to the center of swing; and a pair of inside engaging bodies 23A, 23B provided on an inner side closer to the center of swing than the pair of outside engaging bodies 21A, 21B, the inside engaging bodies having an interval therebetween that changes along with or without regard to the changing interval between the outside engaging bodies 21A, 21B and provided at positions in point symmetry with regard to the center of swing.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a centering jig used to make the central axis of a hollow part having a circular opening shape coincide with the central axis of a cylindrical member fitted in the hollow part.

There is a universal demand for specifying the central axis of a hollow portion (hereinafter simply referred to as a hollow portion) having a circular opening shape, and many proposals have been made so far.
For example, Patent Literature 1 proposes that three sets of pantographs (11a, 11a, 11a) are provided, and the support legs of each pantograph are brought into contact with the inner peripheral surface of the hollow portion. According to Patent Document 1, each pantograph accurately captures the inner peripheral surface, whereby the center axis can be accurately specified for the hollow portion. Further, Patent Document 2 uses three sets of link mechanisms different from the pantograph, and specifies the central axis by bringing the support legs of each link mechanism into contact with the inner peripheral surface in the same manner as Patent Document 1. Has proposed.
As described above, both Patent Literature 1 and Patent Literature 2 specify the central axis of the hollow portion by using three sets of link mechanisms.

JP 2003-43179 A Japanese Patent No. 5272267

When the cylindrical member is inserted and fitted into the hollow portion, the central axis of the hollow portion and the central axis of the cylindrical member are required to coincide with each other. However, when the cylindrical member is inserted, the member having the hollow portion is deformed, and the central axes of both may be displaced.
In both of the proposals in Patent Document 1 and Patent Document 2 described above, since it is necessary to arrange a link mechanism in the hollow portion in order to specify the central axis, a cylindrical member to be fitted in the hollow portion is originally used. Can't insert.
As described above, the present invention has an object of providing a centering jig capable of matching the central axis of a hollow portion having a circular opening shape with the central axis of a cylindrical member fitted into the hollow portion. And

  The centering jig of the present invention swings and moves within a predetermined angle range, the first arm and the second arm having the same length, and the first arm and the second arm are connected so as to be swingable. A first joint provided with a center, a pair of outer locking bodies which are arranged in a point-symmetrical position with respect to the center of swing, a distance between which is widened according to the swinging motion of the first arm and the second arm, and a pair of A pair of inner sides that are provided on the inner side with the center of swinging than the outer locking body, and that the distance between the outer locking body and the outer locking body is wide or narrow, and the point is symmetrical with respect to the swinging center. And a locking body.

  The centering jig of the present invention is locked to a pair of outer locking members that are locked to a member having a hollow portion having a circular opening shape, and a cylindrical member that is fitted to the hollow portion of the member. A pair of inner locking bodies. In addition, the pair of outer locking bodies are provided at positions that are point-symmetric with respect to the swing center, and the pair of inner locking bodies are provided at positions that are point-symmetric with respect to the swing center. Therefore, if the pair of outer locking bodies locks the member having the hollow portion, and the pair of inner locking bodies locks the cylindrical member, the central axis of the hollow portion and the central axis of the cylindrical member Can be matched.

In the centering jig of the present invention, there are two forms as the connection state of the first arm and the second arm. In the first configuration, the first arm and the second arm rotate together via the first joint, and in the second configuration, the first arm and the second arm are rigidly connected to the first joint. Is done.
The first form requires less load to swing the first arm and the second arm. Moreover, since the 2nd form is not provided with a rotation part, a highly accurate centering can be performed.

As a first form, the first arm and the second arm make a rotation pair with each other, make a rotation pair with each other, and the first arm and the third arm and the fourth arm have the same length, respectively, A second joint that pivotably connects the arm and the third arm, a third joint that pivotally connects the third arm and the fourth arm, and a pivotally couples the fourth arm and the first arm. A fourth joint, and the first arm, the second arm, the third arm, and the fourth arm form a parallel link mechanism, and the pair of outer locking bodies are respectively connected to the second joint and the fourth joint. The pair of inner locking members can be fixed to the third arm and the fourth arm, respectively.
In this embodiment, the first arm to the second arm and the first joint to the fourth joint form a parallel link mechanism, and a stable centering operation can be realized.

Further, as a first form, the first arm and the second arm form a rotational pair, and the pair of outer locking bodies are fixed to the first arm and the second arm, respectively. The body can be one in which each is fixed to the first arm and the second arm.
This form has an advantage that the centering jig can be configured with a small number of members.

As a second form, the first arm and the second arm are rigidly connected to the first joint, and each of the first arm and the third arm has the same length, and the first arm, A second joint for rigidly coupling the third arm; a third joint for rigidly coupling the third arm and the fourth arm; and a fourth joint for rigidly coupling the fourth arm and the first arm; The locking bodies can be fixed to the second joint and the fourth joint, respectively, and the pair of inner locking bodies can be fixed to the third arm and the fourth arm, respectively.
Since this form is comprised by the 1st arm-the 4th arm and the 1st joint-the 4th joint, it is suitable for the use where rigidity is high and especially high centering accuracy is required.
In this embodiment, it is preferable that the first arm, the second arm, the third arm, and the fourth arm have a lower rigidity in the vicinity where they are rigidly connected than in other regions. If it does so, the axial force required in order to open and close a 1st arm-a 4th arm can be restrained low.

As a second form, the first arm and the second arm are rigidly coupled to the first joint, and the second arm includes a third arm and a fourth arm, each having the same length. A second joint for rigidly coupling the third arm and the fourth arm, a third joint for rigidly coupling the third arm and the fourth arm, a fourth joint for rigidly coupling the fourth arm and the first arm, a first joint and a second joint And an actuating body that is provided so as to be movable along an action line that connects the centers of the three joints and that causes the first arm, the second arm, the third arm, and the fourth arm to swing. And this centering jig can fix each of a pair of outer side latching bodies to a 2nd joint and a 4th joint, and can provide only one set of a pair of inner side latching bodies so that an operation body may be enclosed. A pair of inner side locking bodies can make the space | interval wide according to the movement along the action line of an action body.
According to this aspect, by providing a plurality of sets of a pair of inner locking bodies, the inner locking bodies can be locked to a cylindrical member that is a centering object in a plurality of directions of two-dimensional coordinates. Therefore, centering can be more easily performed with respect to misalignment occurring in an arbitrary direction of the two-dimensional coordinates.
In this embodiment, the operating body has a pressing portion that expands the inner locking body by pushing the inner locking body outward, and the inner locking body is pushed and bent by the pressing portion of the operating body when the operating body causes a swinging motion. And a locking portion that is connected to the flexible portion and locked to the centering target portion.

  According to the present invention, if the pair of outer locking bodies locks the member having the hollow portion, and the pair of inner locking bodies locks the cylindrical member, the central axis of the hollow portion and the cylindrical member Can be made to coincide with the central axis.

It is a figure showing composition and operation of a centering jig concerning a 1st embodiment of the present invention. It is a figure which shows the procedure which centers the center axis | shaft of a hollow part and the center axis | shaft of a cylindrical member using the centering jig | tool which concerns on 1st Embodiment. It is a figure which shows the structure of the centering jig | tool which concerns on 2nd Embodiment of this invention as an arm, (a) is a top view, (b) is a front view, (c) is a bottom view. It is a figure which shows operation | movement of the centering jig | tool which concerns on 2nd Embodiment. It is a figure which shows the modification of 1st Embodiment and 2nd Embodiment. It is a figure which shows the procedure of centering in this embodiment. It is a figure which shows the other modification of 2nd Embodiment. It is a figure which shows the process in which center misalignment is cured with the centering jig | tool which concerns on embodiment shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[First Embodiment]
The centering jig 1 according to the first embodiment corresponds to the above-described first form in which the first arm 11 and the second arm 12 are in rotation with each other via the first joint 15. As shown in FIGS. 1 and 2, a pantograph composed of a parallel link mechanism is used. FIGS. 1 and 2 show simplified elements of the centering jig 1.
As shown in FIG. 1, the centering jig 1 includes an opening / closing mechanism 10, a pair of outer locking bodies 21 </ b> A and 21 </ b> B fixed to the opening / closing mechanism 10, and a pair of inner locking bodies fixed to the opening / closing mechanism 10. 23A, 23B.

The opening / closing mechanism 10 includes a first arm 11, a second arm 12, a third arm 13, and a fourth arm 14.
The first arm 11 to the fourth arm 14 are produced with the same specifications such as dimensions and shape. Here, the same specification is not required to be physically completely the same, and it is sufficient that the same specifications are sufficient to function as a parallel link mechanism.

The first arm 11 and the second arm 12 are swingably connected by a first joint 15, the second arm 12 and the third arm 13 are swingably connected by a second joint 16, and the third arm 13 and The four arms 14 are swingably connected by a third joint 17, and the fourth arm 14 and the first arm 11 are swingably connected by a fourth joint 18. The 1st joint 15-the 4th joint 18 have connected the corresponding arm member rotatably. That is, the first arm 11 and the second arm 12, the second arm 12 and the third arm 13, the third arm 13 and the fourth arm 14, and the fourth arm 14 and the first arm 11 are mutually in rotation pairs. ing. Since the opening / closing mechanism 10 is a parallel link mechanism, the first arm 11 and the second arm 12, the second arm 12 and the third arm 13, the third arm 13 and the fourth arm 14, and the fourth arm 14 and the first arm 14. Each of the arms 11 swings within a predetermined angle range with the first joint 15 to the fourth joint 18 as the swing center.
Here, an imaginary line passing through the center of the first joint 15 and the center of the third joint 17 is referred to as an action line L1, and an imaginary line passing through the center of the second joint 16 and the center of the fourth joint 18 is referred to as a perpendicular line L2. I will decide.
Moreover, although the 1st joint 15-the 4th joint 18 have a pin and a pin hole as a mechanical element for making a rotation pair, the description is abbreviate | omitted.

  When the opening / closing mechanism 10 having the above configuration is applied with an axial force F along the line of action L1 as shown in FIG. 1A, the first along the line of action L1 as shown in FIG. 1B. The interval between the joint 15 and the third joint 17 is reduced, and at the same time, the interval between the second joint 16 and the fourth joint 18 along the perpendicular L2 is increased. The centering jig 1 can be centered by increasing the interval in the direction of the perpendicular L2. The operation of the opening / closing mechanism 10 by applying the axial force F in this way is referred to as opening / closing the opening / closing mechanism 10 in the present invention.

As shown in FIG. 2 (a), the outer locking bodies 21A and 21B are locking holes of the cylindrical member 30 having a hollow portion 33 having a circular opening shape used for centering during the centering operation. By engaging with 35A and 35B, the action line L1 of the opening / closing mechanism 10 is made to coincide with the central axis C3 of the hollow portion 33.
The outer locking body 21 </ b> A is fixed to the fourth joint 18 of the opening / closing mechanism 10, and the outer locking body 21 </ b> B is fixed to the second joint 16 of the opening / closing mechanism 10. The outer locking bodies 21A and 21B are respectively fixed to the fourth joint 18 and the second joint 16 so as to be point-symmetrical with respect to the swing center existing in the first joint 15 or the third joint 17. The That is, the distance from the action line L1 to the outer locking body 21A is equal to the distance from the action line L1 to the outer locking body 21B.
Here, an example is shown in which the outer locking body 21A and the outer locking body 21B are fixed to the fourth joint 18 and the second joint 16 so as to be parallel to the action line L1, but they are symmetrical to each other. In addition, for example, even if the outer locking body 21A and the outer locking body 21B have a square shape, the function can be achieved. The same applies to inner locking bodies 23A and 23B described later.
The distance between the outer locking body 21A and the outer locking body 21B is determined in consideration of the dimensions of the cylindrical member 50 to be locked, including opening and closing.

Next, as shown in FIG. 2B, the inner locking bodies 23A and 23B are locked to the inner periphery 55 of the cylindrical member 50 used for centering during the centering operation. The action line L1 of the opening / closing mechanism 10 is made to coincide with the central axis C5 of the cylindrical member 50. The inner locking bodies 23A and 23B are provided closer to the center than the outer locking bodies 21A and 21B, and are provided on the same side as the outer locking bodies 21A and 21B with respect to the perpendicular line L2.
The inner locking body 23 </ b> A is fixed to the fourth arm 14 of the opening / closing mechanism 10, and the inner locking body 23 </ b> B is fixed to the third arm 13 of the opening / closing mechanism 10. The inner locking bodies 23A, 23B are respectively fixed to the third arm 13 and the fourth arm 14 so as to be point-symmetrical with respect to the swing center existing in the first joint 15 or the third joint 17. The That is, the distance from the action line L1 to the inner locking body 23A is equal to the distance from the action line L1 to the inner locking body 23B.
The interval between the inner locking body 23A and the inner locking body 23B is determined in consideration of the dimensions of the cylindrical member 30 to be locked, including opening and closing.

  As shown in FIGS. 1A and 1B, the centering jig 1 opens and closes the opening / closing mechanism 10 so that the positions of the outer locking bodies 21A and 21B and the inner locking bodies 23A and 23B are changed to the action lines. Move away from or approach L1. That is, the inner locking bodies 23A and 23B are widened according to the width of the outer locking bodies 21A and 21B. Through these opening / closing operations, the position of the action line L1 is an intermediate position between the outer locking body 21A and the outer locking body 21B, and at an intermediate position between the inner locking body 23A and the inner locking body 23B. There is no change. That is, if the outer locking body 21 </ b> A and the outer locking body 21 </ b> B are located in the radial direction across the hollow portion 33, the action line L <b> 1 indicates the central axis C <b> 3 of the circular hollow portion 33. Further, if the inner locking body 23 </ b> A and the inner locking body 23 </ b> B are located in the radial direction across the hollow portion 53 of the cylindrical member 50, the central axis C <b> 3 of the cylindrical member 30 and the cylindrical member 50 are The center axes C5 coincide and are centered.

  Next, referring to FIG. 2, while centering using the centering jig 1, the cylindrical member 50 is fitted to the cylindrical member 30, and the cylindrical member 30 and the cylindrical member 50 are aligned. The procedure for centering will be described.

2A and 2B, the cylindrical member 30 includes a main body 31 and a hollow portion 33 that is surrounded by the main body 31. The hollow portion 33 has a circular opening shape having a diameter D33, but the shape of the outer peripheral side of the main body 31 is arbitrary.
The main body 31 includes locking holes 35A and 35B having a circular opening shape at the top. The locking holes 35A and 35B are provided at positions where the distance from the central axis C3 of the hollow portion 33 is equal, and the respective centers are provided at symmetrical positions with respect to the central axis C3. The locking holes 35A and 35B have an opening diameter that allows sufficient play even when the outer locking bodies 21A and 21B are inserted, and the outer locking bodies 21A and 21B have the inserted locking holes 35A and 21B. Displacement in the direction of the perpendicular L2 is possible in 35B.

  The cylindrical member 50 is fitted into the hollow portion 33 of the cylindrical member 30, and includes a main body 51 and a hollow portion 53 surrounded by the main body 51. In the main body 51, the inner peripheral surface 55 and the outer peripheral surface 56 are both circular in shape, and the center is C5 and the diameters are D55 and D56.

  If the cylindrical member 50 and the cylindrical member 50 are fitted to the cylindrical member 30, the central axis C3 of the cylindrical member 30 and the central axis C5 of the cylindrical member 50 ideally coincide with each other. It is made to do. However, when actually fitted, the center axis C3 and the center axis C5 may not coincide with each other, and misalignment may occur. This misalignment is shown in FIG. For example, a case where the cylindrical member 30 is deformed by fitting the cylindrical member 50 is applicable. The centering jig 1 corrects this misalignment and aligns the central axis C3 and the central axis C5. Hereinafter, this procedure will be specifically described.

First, as shown in FIG. 2A, the outer locking bodies 21A and 21B are inserted into the locking holes 35A and 35B of the cylindrical member 30 in which the cylindrical member 50 is fitted. FIG. 2A shows that the outer locking bodies 21A and 21B are positioned at the centers of the locking holes 35A and 35B, respectively. However, this is an example, for example, the outer locking bodies 21A and 21B. One of these may contact the side walls 36A and 36B surrounding the locking holes 35A and 35B.
When the outer locking bodies 21A and 21B are inserted into the locking holes 35A and 35B, the inner locking bodies 23A and 23B are inserted into the hollow portion 53 of the cylindrical member 50. However, at this time, the inner locking bodies 23 </ b> A and 23 </ b> B are located farther inward than the inner periphery 55 of the cylindrical member 50.

  If the outer locking bodies 21A and 21B are inserted into the locking holes 35A and 35B and the inner locking bodies 23A and 23B are inserted into the hollow portion 53, an axial force F is applied along the action line L1, The interval between the second joint 16 and the fourth joint 18, that is, the interval in the direction of the perpendicular line L2, is increased. 2B, the outer locking bodies 21A and 21B are brought into contact with the side walls 36A and 36B, and the inner locking bodies 23A and 23B are locked to the inner circumference 55. . Hereinafter, contact of the outer locking bodies 21A and 21B with the side walls 36A and 36B is referred to as outer contact, and contact of the inner locking bodies 23A and 23B with the inner periphery 55 is referred to as inner contact. .

FIG. 6 shows this process more specifically.
When the interval in the direction of the vertical line L2 is increased from FIG. 6A, the outer locking bodies 21A and 21B approach the side walls 36A and 36B as shown in FIG. 6B, and the inner locking bodies 23A and 23B. Approaches the inner circumference 55. When the interval in the direction of the perpendicular L2 is further widened, as shown in FIG. 6C, the outer locking bodies 21A and 21B are in contact with the side walls 36A and 36B, and the inner locking bodies 23A and 23B are on the inner circumference 55. When contact is made, the cylindrical member 50 is displaced by the inner locking bodies 23A and 23B, so that the central axis C3 and the central axis C5 coincide.

[Effect]
As described above, the centering jig 1 includes the outer locking bodies 21A and 21B locked to the cylindrical member 30 and the inner locking bodies 23A and 23B locked to the cylindrical member 50. By providing, the cylindrical member 30 and the cylindrical member 50 can be centered. Moreover, since the centering jig 1 can realize centering only by applying a load along the action line L1, the centering operation can be facilitated.
The centering jig 1 can realize a stable centering operation because the opening / closing mechanism 10 forms a parallel link mechanism.

[Modification of First Embodiment]
The centering jig 1 includes four arms, a first arm 11 to a fourth arm 14, but as shown in FIG. 5A, the present invention has two arms, a first arm 25 and a second arm 26. The centering jig 3 can be constituted by an arm member. In the centering jig 3, the first arm 25 and the second arm 26 are connected by the first joint 27, but the first arm 25 and the second arm 26 can freely rotate with respect to the first joint 27. It is not recognized. That is, the first arm 25 and the second arm 26 oscillate around the first joint 27, but the oscillating angle by one oscillating motion and the oscillating angle by the other oscillating motion. Are connected by the first joint 27 so as to coincide with each other. In the centering jig 3, each of the first arm 25 and the second arm 26 includes outer locking bodies 21A and 21B and inner locking bodies 23A and 23B. In this example, the outer locking bodies 21A and 21B are provided at the tips of the first arm 25 and the second arm 26, but can also be provided at positions away from the tips.
According to the centering jig 3, as with the centering jig 1, the cylindrical member 30 and the cylindrical member 50 can be centered. Moreover, the centering jig 3 can be composed of two first arms 25, second arms 26, and one first joint 27 except for the outer locking bodies 21A, 21B and the inner locking bodies 23A, 23B. Therefore, it can be manufactured at a lower cost than the centering jig 1.

[Second Embodiment]
Next, regarding the centering jig 2 according to the second embodiment of the present invention in which the second form described above, that is, the first arm 61 and the second arm 62 are rigidly coupled to the first joint 65, This will be described with reference to FIGS.
The centering jig 1 of the first embodiment uses an arm mechanism having a rotation treatment to change the interval in the direction of the perpendicular L2, but the centering jig 2 of the second embodiment uses elastic deformation of a metal member. By changing the distance in the direction of the vertical line L2, it is composed of a structure that performs a function equivalent to the opening / closing mechanism 10 of the first embodiment. Since the centering jig 2 does not include the pins and pin holes provided in the centering jig 1, deviation of the centering position due to tolerance or wear due to sliding can be eliminated as much as possible.

  As shown in FIG. 3, the centering jig 2 includes an opening / closing mechanism 60, a pair of outer locking bodies 41 </ b> A and 41 </ b> B fixed to the opening / closing mechanism 60, and a pair of inner locking bodies fixed to the opening / closing mechanism 60. 43A, 43B.

As shown in FIG. 3, the opening / closing mechanism 60 includes a first arm 61, a second arm 62, a third arm 63, and a fourth arm 64.
The first arm 61 to the fourth arm 64 are manufactured with the same specifications such as dimensions and shape. Here, it is the same as the first embodiment that the same specification is not required to be physically identical.

  The first arm 61 and the second arm 62 are coupled by a first joint 65, the second arm 62 and the third arm 63 are coupled by a second joint 66, and the third arm 63 and the fourth arm 64 are coupled by a third joint 67. The fourth arm 64 and the first arm 61 are connected by a fourth joint 68. Although the first arm 61 to the fourth arm 64 can be elastically deformed, the first joint 65 to the fourth joint 68 can be applied even if a load is applied to the extent that the first arm 61 to the fourth arm 64 are elastically deformed. Rigidity that does not elastically deform.

The opening / closing mechanism 60 is formed integrally with the first arm 61 to the fourth arm 64 and the first joint 65 to the fourth joint 68 by, for example, punching a metal plate material.
The coupling of the first arm 61 and the second arm 62 in the first joint 65 is a rigid coupling, and the coupling of the second joint 66, the third joint 67, and the fourth joint 68 with the arm is also a rigid coupling.

When the opening / closing mechanism 60 having the above configuration is applied with an axial force F along the action line L1 as shown in FIG. 4A, the first opening along the action line L1 as shown in FIG. 4B. The interval between the joint 65 and the third joint 67 is reduced, and at the same time, the interval between the second joint 66 and the fourth joint 68 along the perpendicular L2 is increased. The centering jig 2 aligns the central axes of the cylindrical members 30 and 50 used for centering in the same manner as in the first embodiment by increasing the interval in the direction of the perpendicular line L2.
When the interval in the direction of the perpendicular line L2 increases, the opening / closing mechanism 60 has a first arm 61 and a second arm 62, a second arm 62 and a third arm 63, a third arm 63 and a fourth arm 64, and a fourth arm 64. Each of the first arms 61 oscillates within a predetermined angle range.

The outer locking bodies 41A and 41B have the same configuration and function as the outer locking bodies 21A and 21B of the first embodiment, and the engagement of the cylindrical member 30 used for centering during the centering operation. By engaging with the stop holes 35 </ b> A and 35 </ b> B, the action line L <b> 1 of the opening / closing mechanism 60 coincides with the central axis of the cylindrical member 30.
The outer locking body 41A is fixed to the fourth joint 68 of the opening / closing mechanism 60, and the outer locking body 41B is fixed to the second joint 66 of the opening / closing mechanism 60. The outer locking bodies 41A and 41B are respectively fixed to the fourth joint 68 and the second joint 66 so as to be symmetric with respect to the action line L1. That is, the distance from the action line L1 to the outer locking body 41A is equal to the distance from the action line L1 to the outer locking body 41B.

Next, the inner locking bodies 43A and 43B have the same configuration and function as the inner locking bodies 23A and 23B of the first embodiment, and are cylindrical shapes used for centering during the centering operation. By engaging with the inner periphery 55 of the member 50, the action line L <b> 1 of the opening / closing mechanism 60 is aligned with the central axis of the cylindrical member 50. The inner locking bodies 43A and 43B are provided closer to the center than the outer locking bodies 41A and 41B.
The inner locking body 43A is fixed to the fourth arm 64 of the opening / closing mechanism 60, and the inner locking body 43B is fixed to the third arm 63 of the opening / closing mechanism 60. The inner locking bodies 43A and 43B are respectively fixed to the fourth arm 64 and the third arm 63 so as to be symmetric with respect to the action line L1.

[Effect]
The opening / closing operation of the opening / closing mechanism 60 of the centering jig 2 is caused by the elastic deformation of the first arm 61, the second arm 62, the third arm 63, and the fourth arm 64, specifically, the bending. Is different. However, except for this point, the centering jig 2 has the same configuration as the centering jig 1 of the first embodiment, so if a load is applied along the line of action L1, the cylindrical member 30 and There is an effect that the cylindrical member 50 can be centered.

  Further, the centering jig 2 is rigidly connected to the arms of the first joint 65, the second joint 66, the third joint 67, and the fourth joint 68, and does not include a rotating pair. Errors due to dimensional tolerances can be eliminated. Therefore, centering can be performed with higher accuracy than in the first embodiment.

[Modification 1 of Second Embodiment]
As shown in FIG. 5B, the centering jig 2 is provided with a notch 69 in the first arm 61, the second arm 62, the third arm 63 and the fourth arm 64 of the centering jig 2. Also good.
The centering jig 2 requires a high axial force F in order to elastically deform the first arm 61, the second arm 62, the third arm 63, and the fourth arm 64. The notch 69 has a locally extreme rigidity by lowering the rigidity of the first arm 61, the second arm 62, the third arm 63, and the fourth arm 64 in the vicinity where the first arm 61, the third arm 63, and the fourth arm 64 are rigidly coupled. This axial force F can be reduced by making a portion with low bending rigidity and allowing deformation at the location like a hinge structure.

In this embodiment, when the first arm 61, the second arm 62, the third arm 63, and the fourth arm 64 are bent and deformed at a portion where the notch 69 is not provided, the outer locking body 41 is moved outward. Since it does not spread efficiently, it is necessary to ensure the width W of the central portion in the length direction so that bending deformation does not occur. Therefore, the notch 69 is provided in the vicinity of each of the first arm 61 to the fourth arm 64 and the first joint 65 to the fourth joint 68. However, for example, if the notch 69 is provided continuously to the boundary between the first arm 61 and the first joint 65, a crack may occur between the first arm 61 and the first joint 65 from the notch 69. A notch 69 is provided apart from one joint 65.
According to the study by the present inventors, increasing the size of the notch 69 relative to the length of the first arm 61 to the fourth arm 64 causes the main stress generated in the first arm 61 to the fourth arm 64. Is preferable. In this case, it is preferable to reduce the plate thickness of the first arm 61 to the fourth arm 64.

  Further, in consideration of the stress generated in the first arm 61, the second arm 62, the third arm 63 and the fourth arm 64 during the opening operation of the centering jig 2, a position where the notch 69 is provided in each arm. Determine.

The shape of the notch 69 is a semicircular shape in FIG. 5B, but may be any shape as long as a portion having a lower rigidity than other regions can be provided. For example, it may not be formed only by a curve like a semicircle, but may have a straight line. For example, a wedge shape formed by cutting into a V shape is applicable.
However, it is preferable to have a curvature at the tip of the cut so that cracks do not occur due to stress concentration.

  In the centering jig 2 shown in FIG. 5B, the axial force required to spread the arm left and right is small. In addition, since the first arm 61 to the fourth arm 64 have a sufficient thickness width W except for both ends where the notches 69 are provided, bending deformation is suppressed. Furthermore, since only the notch is made in the arm, the processing is easy. For example, when the centering jig 2 is manufactured by punching, the portion of the notch 69 can be formed at the same time, so the processing burden does not increase.

[Modification 2 of the second embodiment]
The centering jig 2 includes four arms, ie, a first arm 61 to a fourth arm 64. However, as shown in FIG. 5C, the first arm 71 is used even when elastic deformation of the arm is used. And the centering jig 4 can be constituted by two members of the second arm 72. In the centering jig 4, a first arm 71 and a second arm 72 are rigidly connected to a first joint 73. When the first arm 71 and the second arm 72 are elastically deformed, the outer locking bodies 41A and 41B and the inner locking bodies 43A and 43B are displaced, and thereby centering can be performed by the centering jig 2. It is the same.

[Modification 3 of the second embodiment]
The inner locking bodies 43A and 43B of the centering jig 2 widen and narrow according to the width of the outer locking bodies 41A and 41B, but the inner locking bodies 83A and 83B of the centering jig 5 described below are outer locking. The bodies 41A and 41B are widened regardless of the width.

  Similar to the centering jig 2, the centering jig 5 is a structure that performs the equivalent function of the opening / closing mechanism 10 of the first embodiment by changing the interval in the direction of the perpendicular L2 using elastic deformation of a metal member. Consists of. Specifically, as shown in FIGS. 7A and 7B, the opening / closing mechanism 60, the operating body 85 that opens and closes the opening / closing mechanism 60 by tightening and loosening the nut 88, and the opening / closing mechanism 60 are fixed. A pair of inner locking bodies 83A, 83B and a pair of outer locking bodies 41A, 41B fixed to the opening / closing mechanism 60 are provided.

As shown in FIGS. 7A and 7B, the opening / closing mechanism 60 includes a first arm 61 and a second arm that are manufactured with the same dimensions and shape as the centering jig 2. 62, a third arm 63, and a fourth arm 64. Each of the first arm 61 to the fourth arm 64 is coupled by a first joint 65 to a fourth joint 68 in the same manner as the centering jig 2. Although the first arm 61 to the fourth arm 64 can be elastically deformed, the first joint 65 to the fourth joint 68 can be applied even if a load is applied to the extent that the first arm 61 to the fourth arm 64 are elastically deformed. Rigidity that does not elastically deform.
Although the opening / closing mechanism 60 is not clearly shown in FIG. 7B, the first arm 61 and the fourth arm 64 are arranged so that the axes thereof form a minute angle, and the second arm 62 and the third arm 63. Also, the axes are configured to form the same minute angle. Therefore, the opening / closing mechanism 60 forms a four-bar linkage mechanism in which the interval between the second joint 66 and the fourth joint 68 is increased when the interval between the first joint 65 and the third joint 67 is reduced.

As shown in FIGS. 7A and 7B, the first joint 65 includes a connecting portion 652 in which the first arm 61 and the second arm 62 are connected, and a base 653 that is connected to the connecting portion 652 and protrudes upward. Have. A seat surface 654 for receiving the nut 88 is formed at the center of the base 653 so as to protrude further upward.
The third joint 67 includes a connecting portion 672 in which the third arm 63 and the fourth arm 64 are continuous, and a pedestal 673 that is connected to the connecting portion 672 and protrudes downward.
The connecting portion 652 and the pedestal 653, and the connecting portion 672 and the pedestal 673 have a symmetrical shape with respect to the perpendicular line L2.

  The second joint 66 and the fourth joint 68 have a pair of guides 82 for stably placing the centering jig 5 on the cylindrical member 30 when performing the centering operation using the centering jig 5. Is provided. Each guide 82 extends like a wing from the side surface of each of the second joint 66 and the fourth joint 68 as shown in FIG. When the guide 82 is placed on the cylindrical member 30, the guide 82 is formed in a V shape along the top surface thereof.

As shown in FIG. 7C, the opening / closing mechanism 60 includes an insertion hole 651 into which a sliding portion 86 of an operating body 85 described later is slidably inserted into the first joint 65, and an insertion hole 651. Bolt holes 655 that pass through the seating surface 654 of one joint 65 are provided. The third joint 67 is provided with an insertion hole 671 penetrating in the direction of the action line L1.
The insertion hole 651 and the insertion hole 671 have the same diameter and are formed so that their axes coincide with each other. Accordingly, the operating body 85 is provided so as to be movable along an action line L1 connecting the centers of the first joint 65 and the third joint 67.

  As shown in FIGS. 7B and 7C, the operating body 85 is connected to the cylindrical sliding portion 86 and the lower end of the sliding portion 86, and pushes inner locking bodies 83A and 83B described later outward. And a pressing portion 87 that spreads. The sliding part 86 and the pressing part 87 are formed so that the axes coincide with each other.

  The sliding portion 86 is provided with a bolt 89 passing through the hollow portion. Specifically, the hollow portion includes a bolt hole 861 through which the bolt 89 passes, and an insertion hole 862 that is continuous with the bolt hole 861 and has a diameter larger than that of the bolt hole 861. As shown in FIG. 7C, the bolt hole 861 and the insertion hole 862 are connected via a stepped surface 863 to which the head 89H of the bolt 89 is locked.

The pressing portion 87 has a disk-like contact portion 871 extending outward in the radial direction from the lower end of the sliding portion 86, and the diameter gradually increases downward from the periphery of the contact portion 871, and the outer peripheral surface is tapered. An interference portion 872 formed.
The outer peripheral surface of the interference portion 872 interferes with inner locking bodies 83A and 83B, which will be described later, and causes the inner locking bodies 83A and 83B to perform a wide and narrow operation. The hollow portion inside the interference portion 872 is connected to the insertion hole 862 of the sliding portion 86.

  The bolt 89 is inserted into the insertion hole 862 of the sliding portion 86 from below the pressing portion 87, and the screw portion passes through the bolt hole 861 and protrudes from the seating surface 654 of the first joint 65. A nut 88 is fitted into the threaded portion of the bolt 89 protruding from the seating surface 654. By tightening or loosening the nut 88, the distance between the first joint 65 and the third joint 67 can be changed.

As shown in FIGS. 7B and 7C, the inner locking bodies 83A and 83B are flexible portions that can be bent by being pressed by the pressing portion 87 of the operating body 85, specifically, the interference portion 872. 831 and a locking portion 832 that locks with the inner periphery 55 of the cylindrical member 50 that is an inner object for correcting misalignment. As shown in FIG. 7B, the flexible portion 831 extends from the peripheral surface of the base 673 of the third joint 67 to the same lower side as the outer locking bodies 41 </ b> A and 41 </ b> B with the perpendicular L <b> 2 as a reference.
The locking portion 832 is continuous with the lower end of the flexible portion 831 and extends outward in the radial direction. The locking portion 832 has an inner peripheral surface that is in contact with the outer peripheral surface of the interference portion 872, and an interference surface 833 that has substantially the same inclination angle as the outer peripheral surface of the interference portion 872. The distal end surface of the locking portion 832 is formed in an arc shape, and as shown in FIG. 7A, the locus connecting the distal end surfaces of the locking portions 832 of the inner locking bodies 83A and 83B is circular. Become.
In the centering jig 5, as shown in FIGS. 7A and 7B, four sets of inner locking bodies 83 </ b> A and 83 </ b> B are arranged so as to surround the operating body 85. Here, the pair of inner locking bodies 83A and 83B refers to those provided at point-symmetrical positions with respect to the swinging centers of the outer locking bodies 41A and 41B through which the action line L1 passes.

  As described above, in the present embodiment, the inner locking bodies 83 </ b> A and 83 </ b> B are provided on the third joint 67. Therefore, the inner locking bodies 83A and 83B are not widened according to the width of the outer locking bodies 41A and 41B because the third joint 67 is not elastically deformed when the opening and closing mechanism 60 is opened and closed. As will be described later, the inner locking bodies 83A and 83B are widened and narrowed by a mechanism for opening and closing the opening / closing mechanism 60 of the operating body 85. That is, the inner locking bodies 83A and 83B are widened without following the width of the outer locking bodies 41A and 41B.

  As shown in FIG. 7C, the centering jig 5 having the above configuration moves the bolt 89 upward in the axial direction when the nut 88 is tightened, so that the head 89 </ b> H of the bolt 89 moves the sliding portion 86. The pressing portion 87 of the operating body 85 is moved upward from the initial position (indicated by the one-dot chain line in FIG. 7C). Then, the outer peripheral surface of the interference portion 872 of the pressing portion 87 pushes the inner locking bodies 83A and 83B outward, so that the locking portion 832 of the inner locking bodies 83A and 83B is moved to the initial position (see FIG. 7C). Move outward (indicated by broken lines).

When the nut 88 is further tightened, the contact portion 871 of the operating body 85 moved upward comes into contact with the third joint 67. By tightening the nut 88 after the contact portion 871 and the third joint 67 come into contact with each other, the operating body 85 pushes the third joint 67 toward the first joint 65 as shown in FIG. The nut 88 pushes the first joint 65 toward the third joint 67. Then, the axial force F is applied along the action line L1.
Thus, also in the opening / closing mechanism 60 of the present embodiment, when the nut 88 is tightened and the axial force F is applied along the action line L1, the distance between the first joint 65 and the third joint 67 along the action line L1 is reduced. At the same time, the distance between the second joint 66 and the fourth joint 68 along the perpendicular line L2 increases. Thereby, the space | interval of outer side locking body 41A, 41B becomes wide.
On the contrary, when the nut 88 is loosened, the interference portion 872 of the pressing portion 87 is separated from the inner locking bodies 83A and 83B, so that the locking portions 832 of the inner locking bodies 83A and 83B move to the initial position. Thus, the interval between the inner locking bodies 83 </ b> A and 83 </ b> B is widened and narrowed by tightening the nut 88.

Similarly to the centering jig 1 shown in FIG. 2B, the centering jig 5 described so far also locks the inner locking members 83A and 83B to the inner periphery 55, and the cylindrical member 50 is moved to the inner side. The center axis C3 and the center axis C5 are made to coincide by being displaced by the locking bodies 23A and 23B.
By the way, when the cylindrical member 50 is fitted to the cylindrical member 30, misalignment in which the central axis C3 and the central axis C5 do not coincide passes through the locking holes 35A and 35B as shown in FIG. Not only on the X-axis line, but also in the Y-axis direction perpendicular to the X-axis, as shown in FIG. Even in this case, since the centering jig 5 includes four sets of inner locking bodies 83A and 83B along the circumferential direction, as shown in FIG. 8C, the centering jig 5 is defined by the X axis and the Y axis. The inner locking bodies 83 </ b> A and 83 </ b> B can be brought into inner contact with the inner circumference 55 in a plurality of two-dimensional coordinates to be performed, in this embodiment, in four directions.
Therefore, the center axis C3 and the center axis C5 are more easily matched with respect to misalignment that occurs in an arbitrary direction of the two-dimensional coordinates, compared to the case where only one set of the inner locking bodies 83A and 83B are in contact with each other. Can be made.

  As shown in FIGS. 7A and 7B, the centering jig 5 has a semicircular cutout 69 in the first arm 61, the second arm 62, the third arm 63, and the fourth arm 64. However, the notch 69 need not be provided. Even in such a case, the axial force F required to deform the first arm 61, the second arm 62, the third arm 63, and the fourth arm 64 can be obtained by tightening the nut 88.

  In the present embodiment, the inner locking bodies 83A and 83B are provided on the third joint 67. However, similarly to the centering jig 2, they may be provided on the third arm 63 and the fourth arm 64, respectively. Good. Also in this case, the inner locking bodies 83A and 83B can be widened and narrowed by the operating body 85.

  The preferred embodiment of the present invention has been described above. However, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention.

For example, the outer locking bodies 21A to 41B and the inner locking bodies 23A to 43B are merely examples of a straight line as the simplest form, for example, the inner locking whose tip is bent in an L shape. A stationary body can also be used.
Further, as a means for applying the axial force F to the centering jigs 1 and 2, similarly to the centering jig 5, a mechanism for converting the rotation of the screw into a linear reciprocating motion or the rotational force of the electric motor is used. Any means can be applied.

Furthermore, although the centering jig | tool 2 showed the example integrally molded, this invention is not limited to this. That is, the centering jig 2 has a gist that it does not have a rotating portion, and may be composed of a plurality of members as long as it has this gist.
Furthermore, in the above embodiment, the example in which the cylindrical member 50 is fitted to the cylindrical member 30 and then centered is shown. However, if the centering jig of the present invention is used, centering is performed while fitting. It can also be done.

1, 2, 3, 4, 5 Centering jig 10 Opening / closing mechanism 11 First arm 12 Second arm 13 Third arm 14 Fourth arm 15 First joint 16 Second joint 17 Third joint 18 Fourth joint 21A, 21B outer locking body 23A, 23B inner locking body 25 first arm 26 second arm 27 first joint 30 cylindrical member 31 main body 33 hollow portion 35A, 35B locking hole 36A, 36B side wall 41A, 41B outer locking body 43A, 43B Inner locking body 50 Cylindrical member 51 Main body 53 Hollow portion 55 Inner circumference 56 Outer circumference 60 Opening / closing mechanism 61 First arm 62 Second arm 63 Third arm 64 Fourth arm 65 First joint 651 Insertion hole 652 Connecting portion 653 Base 654 Seat surface 655 Bolt hole 66 Second joint 67 Third joint 671 Insertion hole 672 Connecting portion 67 Base 68 Fourth joint 71 First arm 72 Second arm 73 First joint 82 Guide 83A, 83B Inner locking body 831 Flexible portion 832 Locking portion 833 Interference surface 85 Actuator 86 Sliding portion 861 Bolt hole 862 Insertion hole 863 Stepped surface 87 Pressing portion 871 Abutting portion 872 Interference portion 88 Nut 89 Bolt 89H Head

Claims (8)

A first arm and a second arm having the same length that oscillate within a predetermined angle range;
A first joint that pivotably connects the first arm and the second arm, and a pivot center is provided;
A pair of outer locking bodies whose distances are widened according to the swinging motion of the first arm and the second arm, and are provided at point-symmetrical positions with respect to the swing center;
Positioned symmetrically with respect to the center of swing, provided on the inner side of the swing center than the pair of outer locks, and the distance between the outer locks is wide or narrow according to the width of the outer lock. A pair of inner locking bodies provided in
A centering jig characterized by comprising: The first arm and the second arm form a rotational pair with each other via the first joint, or
The first arm and the second arm are rigidly coupled to the first joint;
The centering jig according to claim 1. The first arm and the second arm form a rotating pair with each other,
A rotating pair is formed, and the first arm and the third arm and the fourth arm, each having the same length,
A second joint that pivotably connects the second arm and the third arm;
A third joint that pivotably connects the third arm and the fourth arm;
The fourth arm and the fourth joint that pivotably connects the first arm so that the first arm, the second arm, the third arm, and the fourth arm have a parallel link mechanism. None,
Each of the pair of outer locking bodies is fixed to the second joint and the fourth joint,
Each of the pair of inner locking bodies is fixed to the third arm and the fourth arm,
The centering jig according to claim 2. The first arm and the second arm form a rotating pair with each other,
Each of the pair of outer locking bodies is fixed to the first arm and the second arm,
Each of the pair of inner locking bodies is fixed to the first arm and the second arm,
The centering jig according to claim 2. The first arm and the second arm are rigidly coupled to the first joint,
The first arm and the third arm and the fourth arm, each having the same length,
A second joint that rigidly couples the second arm and the third arm;
A third joint for rigidly connecting the third arm and the fourth arm;
A fourth joint for rigidly coupling the fourth arm and the first arm;
Each of the pair of outer locking bodies is fixed to the second joint and the fourth joint,
Each of the pair of inner locking bodies is fixed to the third arm and the fourth arm,
The centering jig according to claim 2. The first arm and the second arm are rigidly coupled to the first joint,
The first arm and the third arm and the fourth arm, each having the same length,
A second joint that rigidly couples the second arm and the third arm;
A third joint for rigidly connecting the third arm and the fourth arm;
A fourth joint that rigidly couples the fourth arm and the first arm;
It is provided to be movable along an action line connecting the centers of the first joint and the third joint, and the swinging motion of the first arm, the second arm, the third arm, and the fourth arm is performed. An actuating body for generating,
Each of the pair of outer locking bodies is fixed to the second joint and the fourth joint,
A pair of the inner locking bodies are provided only in multiple sets so as to surround the operating body,
A pair of the inner locking bodies is widened and narrowed according to the movement of the operating body along the action line.
The centering jig according to claim 2. The operating body is:
Having a pressing portion that pushes the inner locking body outward and widens,
The inner locking body includes a flexible portion that is bent by being pressed by the pressing portion of the operating body when the operating body causes the swinging motion, and an object to be centered connected to the flexible portion. A locking portion to be locked,
The centering jig according to claim 6. The first arm, the second arm, the third arm and the fourth arm are:
The vicinity where the rigid coupling is performed is lower in rigidity than other regions.
The centering jig according to any one of claims 5 to 7.

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