JP2585744Y2 - Rotary axis fine movement device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary shaft fine-moving device, and makes it possible to vary a fine feed amount when finely moving a rotary shaft of a surveying instrument in order to precisely align a collimating direction of the surveying instrument with a target. The present invention relates to a rotary shaft fine movement device.

[0002]

2. Description of the Related Art A surveying instrument has a rotating shaft fine-movement device for rotating a rotating shaft. This rotating shaft fine-moving device integrates a rotating shaft of a surveying device with a tightening ring by operating a clamp shaft.
By slightly moving the projection of the tightening ring in the rotation tangential direction of the rotation shaft, the rotation shaft is finely moved (small rotation).

FIG. 3 shows a rotary shaft fine-moving device which can set the fine-feed amount of the rotary shaft in two stages among such rotary-axis fine-moving devices. The shaft fine movement device will be described. The fine movement shaft 21 has a pitch P
4, a male screw part 23 having a pitch P5, and a connecting member 24 connecting the two screw parts. A fine movement knob 25 is provided at one end of the fine movement shaft 21.
The fine movement knob 25 has a pin 30 protruding therefrom. The middle cylinder 26 is screwed into the second male screw part 23 of the fine movement shaft 21, and the outer cylinder 28 is screwed into the first male screw part 22.

[0004] The middle cylinder 26 has a projection 26a formed at the tip thereof for contacting the tightening ring 31, and a pin 27 protruding at the rear end. The outer cylinder 28 has a male screw portion with a pitch P6, a notch 28a, and a pin 29. An external thread portion having a pitch P6 is formed on the outer periphery of the middle cylinder 26, and the main body fixing portion 40
To screw. The notch 28 a is a groove located at the tip of the outer cylinder 28 and formed to be long in the axial direction of the fine movement shaft 21. This notch 28a is used for the middle cylinder 26 provided with the pin 27,
The fine movement shaft 21 is connected to the outer cylinder 28 so that the movement of the fine movement shaft 21 in the axial direction is possible and relative rotation is impossible. The pin 29 protrudes from the rear end of the outer cylinder 28 in a direction orthogonal to the axial direction of the fine movement shaft 21.

[0005] The tightening ring 31 is disposed on the outer periphery of the rotating shaft 32 and has a projection 31a extending outward. The projection 31a is pressed against the projection 26a of the middle cylinder by a pin 35 biased by a spring 36. The spring 3
6 and the pin 35 are provided between the cylinder 34 and the lid 37,
The lid 37 is fixed to the main body fixing part 40. Therefore, such a rotating shaft fine movement device performs the following two-stage operation when the fine movement knob 25 is rotated. The first operation is when the pins 29 and 30 are not in contact with each other and the pitch P
The fine movement shaft 21 moves straight in the axial direction while rotating with respect to the outer cylinder 28 by the screw No. 4, and further moves straight in the axial direction with respect to the outer cylinder 28 without rotating the middle cylinder 26 by the screw having the pitch P5. The second operation is that the fine adjustment knob 25 is rotated, the pin 30 of the fine adjustment knob 25 comes into contact with the pin 29 of the outer cylinder 38, and the pin is further rotated. And the outer cylinder 28 rotate integrally. Therefore, such a fine movement feeder moves the protrusion 31a of the tightening ring in the axial direction of the fine movement shaft 21 based on the pitch P4 and the pitch P5 by the first operation, and moves the pitch P6 by the second operation. The protrusion 31a is moved based on
1 in the axial direction.

[0006]

However, in this rotary shaft fine movement device, since the female screw portion and the male screw portion are formed in the outer cylinder 28, the outer cylinder 28 is relatively positioned with respect to the fine movement shaft 21. It is rotatable (actually, the fine movement shaft rotates with respect to the outer cylinder), and can be relatively rotated with respect to the main body 40. For this reason, when the frictional force of the screw with the pitch P4 is larger than the frictional force of the screw with the pitch P6, the rotary shaft fine-movement device performs the fine motion shaft 21 during the first operation in which the pins 30 and 29 are not in contact with each other. And the outer cylinder 28 performs a second operation of rotating integrally.

In order to solve this drawback, this rotary shaft fine movement device needs to be worked so that the frictional force of the screw of pitch P6 is larger than that of the screw of pitch P4. Even with such processing, one of the fine movement feed amounts set in two stages requires a large force to rotate the fine movement knob because the frictional force is large. The present invention has been made in view of such a problem, and an object of the present invention is to provide a rotary shaft fine-movement device capable of setting a two-step fine-movement feed amount regardless of the magnitude of a frictional force of a screw.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problem, a rotating shaft fine-movement device according to the present invention is configured such that a projection (15) provided on a tightening ring (14) is moved substantially in a rotational tangential direction of the tightening ring. A first male screw portion (1a) screwed into a surveying instrument body (11) and a first male screw, wherein the first male screw portion is a rotary shaft fine movement device that rotates a rotary shaft (13) integrated with the tightening ring by being moved. The second male screw part (1
b), a middle cylinder (4) having a female screw part and a third male screw part (4a) screwed into a second male screw part of the fine movement shaft; A rotation limiting member (5, 12) for limiting the rotation of the middle cylinder so as to move straight in the axial direction of the fine movement axis by the rotation of the fine movement axis, but allowing the linear movement of the fine movement axis in the axial direction. An outer cylinder (6) having a female screw portion screwed into a third male screw portion of the middle cylinder and a contact portion (6a) abutting on a projection of the tightening ring; the fine movement shaft and the outer cylinder; And a connecting member (3, 6b) for connecting the fine movement shaft so as to be relatively movable in the axial direction and to allow a relative rotation of a predetermined angle.

[0009]

According to the present invention, the middle cylinder (4) is formed with a male screw and a female screw. Since the rotation of the middle cylinder (4) is restricted by the rotation restricting member, The rotation of the fine movement knob (2) performs only one kind of operation of linearly moving the fine movement axis (1) in the axial direction of the fine movement axis.

When the fine movement shaft (1) rotates within the range of the predetermined angle, the outer cylinder (6) does not rotate with the fine movement axis (1) but moves straightly with the middle cylinder (6), and moves at a predetermined angle. Outside of the range, the connecting member is connected to the fine movement shaft so that it moves in the axial direction of the fine movement shaft (1) with respect to the middle cylinder (4) while rotating together with the fine movement shaft (1). Therefore, the rotating shaft fine-movement device of the present invention performs the following two-stage operation.

First, the first angle within the predetermined angle range is set.
Is moved in the axial direction of the fine movement shaft (1) while rotating the fine movement shaft (1) with respect to the main body (11) screwed with the first male screw portion by the rotation of the fine movement knob (2). The middle cylinder (4) screwed with the shaft (1) by the second male screw portion moves straight in the axial direction of the fine movement shaft (1). Further, the outer cylinder (6) moves straight along with the middle cylinder (4). Therefore, the fine movement feed amount is proportional to the screw pitch (P1) of the first male screw portion and the screw pitch (P2) of the second male screw portion.

In the second operation of the connecting member outside the range of the predetermined angle, the fine movement shaft (1) and the middle cylinder (4) are moved by the rotation of the fine movement knob (2) in the same manner as in the first operation. While moving in the axial direction of (1), the connecting members (3, 6)
The outer cylinder (6) moves in the axial direction of the fine movement shaft (1) with respect to the middle cylinder (4) while rotating together with the fine movement shaft (1) by b). Therefore, the fine movement feed amount is proportional to the screw pitch (P1) of the first male screw portion, the screw pitch (P2) of the second male screw portion, and the screw pitch (P3) of the third male screw portion (4a).

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a diagram showing a configuration of a rotary shaft fine-movement device, and FIG. 2 is a perspective view of a main part of the rotary shaft fine-motion device. As shown in FIG. 1, the fine movement shaft 1 has a first male screw and a portion 1 a,
A second male screw portion 1b is formed. 1st male screw part 1
a is a male screw having a screw pitch P1 and is screwed to a female screw of the main body fixing portion 11. The second male screw portion 1b is a male screw having a screw pitch P2 having a different screw pitch from the first male screw portion 1a.

The fine movement shaft 1 has a fine movement knob 2 fixedly provided at a rear end thereof, and a pin 3 provided at a front end thereof in a direction orthogonal to the axial direction of the fine movement shaft 1. The main body fixing portion 11 is formed with a female screw portion with which the first male screw portion 1a is screwed and a ring-shaped engaging portion 12. A notch 1 partially extending in the axial direction of fine movement shaft 1
2a is formed.

The second male screw portion 1b of the fine movement shaft 1 is screwed with the female screw portion of the middle cylinder 4. The middle cylinder 4 has a third male screw portion 4a formed at a pitch P3 from the front end to the vicinity of the center, and has a cylindrical portion formed at the rear end to be fitted to the engaging portion 12 of the main body. Is screwed with a screw 5 projecting in a direction perpendicular to the cylinder axis of the middle cylinder 4. This screw 5 is shown in FIG.
The head of the screw is an elliptical screw, as shown in FIG. 1, and the elliptical head screw 5 is sandwiched between the notches 12a of the engaging portion 12 so as to sandwich the short-diameter portion of the ellipse. For this reason, even if the middle cylinder 4 is repeatedly moved in the axial direction with respect to the engaging portion 12, the screw 5 is not loosened.

The middle cylinder 4 is screwed into a female thread formed inside the outer cylinder 6 by the third male thread 4a. A conical projection 6a is formed at the tip of the outer cylinder 6 to abut the arm 15 of the tightening ring 14, and an opening 6b through which the pin 3 protruding from the fine movement shaft 1 penetrates is formed on the side surface of the outer cylinder 6. Is formed. The opening 6b has a length sufficient to relatively move the pin 3 and the outer cylinder 6 in the axial direction of the fine movement axis, and has a width sufficient to relatively rotate the pin 3 and the outer cylinder 6 by a predetermined angle. It is an opening.

The arm 15 that contacts the projection 6a is provided on a tightening ring 14, which is arranged around the rotating shaft 13 of the surveying instrument and coaxially with the rotating shaft.
Such a rotating shaft and the tightening ring are tightened by the clamp screw 16 to be integrated. Therefore, the rotating shaft 13 when tightened rotates integrally with the tightening ring 14. Further, the arm 15 is provided with a biasing force from a direction facing the fine movement shaft 1, whereby the arm 15 is always in contact with the protrusion 6 a.

This urging force is obtained by a pin 17 and a spring 18 pressing the pin. The pin 17 and the spring 18 are integrated by a hollow cylinder 19 and a lid 20 for accommodating the pin 17 and the spring 18, and the lid 20 is fixed to the surveying instrument main body fixing part 11. The operation of the fine movement device for the rotating shaft will be described separately for a first operation and a second operation.

First, the first operation will be described. This first operation is an operation when the pin 3 of the fine movement shaft and the opening 6b of the outer cylinder 6 are not in contact with each other within a predetermined angle range.
Referring to FIG. 1, when the knob 2 is rotated clockwise, the fine movement shaft 1 moves rightward on the paper with respect to the main body fixing portion 11 based on the screw pitch P1 of the first male screw portion, and the second
Based on the thread pitch P2 of the male thread, the middle cylinder is
To the left. At this time, since the pin 3 is not in contact with the opening 6b of the outer cylinder 6, the outer cylinder 6 moves leftward integrally with the middle cylinder 4.

Therefore, the first operation causes the distal end portion 6a of the outer cylinder 6 to move in the axial direction of the fine movement shaft 1 by the distance shown in Expression 1.

[0021]

(P1−P2) × θ ÷ 360 degrees where P1 is the screw pitch of the first male screw portion 1a, P2 is the screw pitch of the second male screw portion 1b, and θ is the rotation angle of the fine control knob. Now, assuming that the fine movement knob 2 is rotated by 90 degrees, which is an angle at which the pin 3 does not contact the opening 6b, the movement amount of the distal end portion 6a and the fine movement feed amount are specifically obtained. In addition, the first,
The second and third screws are all right-hand screws, and the pitches are P1 = 0.5 mm, P2 = 0.3 mm, and P3 = 0.
5 mm, and the predetermined angle is 90 degrees.

The above value θ ≠ 90 °, P1 = 0.5 m
m, P2 = 0.3 mm, the projection 6 of the outer cylinder 6 is obtained.
a moves 0.05 mm to the right. Next, the second operation will be described. This second operation is
Outside the range of the predetermined angle, the pin 3 of the fine movement shaft and the opening 6b of the outer cylinder 6
This is the operation in the case where is touching. Pin 3 and opening 6b
When the fine movement knob 2 is further turned clockwise from the position where the contact is made, the fine movement shaft 1 moves to the right and the middle cylinder 4 moves to the left as described in the first operation, and the outer cylinder 6 moves While rotating with the shaft 1, it moves rightward with respect to the middle cylinder 4 based on the thread pitch P3 of the third male screw portion 4 a.

Therefore, the projection 6a of the outer cylinder 6 is moved by the distance shown by the equation (2) by the second operation.

[0024]

(P1−P2 + P3) × θ ÷ 360 degrees where P1 is the thread pitch of the first male thread portion 1a, P2 is the thread pitch of the second male thread portion 1b, and P3 is the third male thread portion P
The screw pitch 3 and θ are the rotation angles of the fine adjustment knob.

Now, assuming that the fine movement knob 2 is further rotated by 90 degrees from the position where the pin 3 and the opening 6b are in contact with each other, the movement amount of the distal end portion 6a and the fine movement feed amount are specifically obtained. In Equation 1, the above values θ ≠ 90 °, P1 = 0.5 mm, P2 = 0.3 m
m, P3 = 0.5 mm, the projection 6 of the outer cylinder 6 is obtained.
a will move 0.175 mm rightward.

As described above, the fine movement amount is different between the first operation before the contact between the pin 3 and the opening 6b and the second operation after the contact, so that the fine movement amount can be adjusted in two stages. . Similarly, when the fine movement knob 2 is rotated counterclockwise, the fine movement axis 1
Moves leftward with respect to the main body fixing portion 11, and the middle cylinder 4 moves rightward with respect to the fine movement axis 1. The fine movement feed amount can be obtained by the same formula 1 as that at the time of right rotation. Therefore, pin 3
When the fine movement knob 2 is rotated counterclockwise by 90 degrees, which is an angle at which the protrusion 6a does not contact the opening 6b, the protrusion 6a moves to the left by 0.0
Move 5 mm.

When the counterclockwise rotation is performed from this state, the pin 3
And the opening 6b come into contact with each other.
Moves to the left, the middle cylinder 4 moves to the right, and the outer cylinder 6 moves to the left with respect to the middle cylinder 4. The fine movement feed amount is
When the fine movement knob 2 is further rotated counterclockwise by 90 degrees since it can be expressed by Equation 2, the protrusion 6a moves 0.175 mm to the left.

As described above, according to the rotary shaft fine movement device of the embodiment, fine movement adjustment with a relatively small feed amount can be performed within the predetermined angle of 90 degrees, and
Fine movement adjustment with a relatively large feed amount can be performed in the range of a predetermined angle or more. In the embodiment, all screws are right-handed screws, but left-handed screws may be used. Further, a right screw and a left screw may be mixed. Further, the screw pitch may be a combination other than that used in the embodiment. Each screw pitch is the following 2
It suffices if the following conditions are satisfied.

P1 ≠ P2 P1 + P3 ≠ P2 Therefore, for example, a right-handed screw and a left-handed screw such as P1 = 0.5 mm for a right-handed screw, P2 = 1.0 mm for a right-handed screw, and P3 = 1.5 mm for a left-handed screw. And P1 <P2. When substituting the actual screw pitch for P1, P2, and P3 in Equations 1 and 2, a positive value is substituted for the right-hand thread and a negative value is substituted for the left-hand thread. In the case of, when the fine movement knob is rotated clockwise, the protrusion 6a advances rightward,
Conversely, if the value is negative, it proceeds to the left.

In order to operate the fine adjustment knob without feeling uncomfortable, all three screw portions use right-handed screws, and the pitch of each screw is | P1-
It is better to set so as to satisfy the relationship of P2 | <| P3 |. The opening 6b in the embodiment is formed so that the predetermined angle is 90 degrees in consideration of the operability of the fine movement knob and the processing of the fine movement device, but the present invention is not limited to this.

In the embodiment, in order to simplify the explanation,
Although the fine movement device and the clamp screw have different shaft configurations,
A coaxial configuration may be adopted. Further, the member abutting on the tightening ring is a conical projection, but the present invention is not limited to this.

[0032]

According to the present invention, since the middle cylinder is supported by the support member so as to be movable in the axial direction of the fine movement shaft without rotating, before the fine movement shaft is connected to the outer cylinder by the connection member. After the connection, the outer cylinder performs a different operation.
Therefore, the device of the present invention can reliably set the two-step fine movement feed amount by changing the operation of the outer cylinder depending on whether it is within or outside the predetermined angle range.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a fine movement device of a rotary shaft according to an embodiment.

FIG. 2 is a perspective view of a rotary shaft fine movement device according to the embodiment.

FIG. 3 is a cross-sectional view showing a conventional fine movement device for a rotating shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fine axis 1a ... 1st male screw part 1b ... 2nd male screw part 3, 6b ... Connection member 4 ... Middle cylinder 4a ... 3rd male screw part 5, 12 ... Support member

Claims (2)

(57) [Scope of request for utility model registration] 1. A rotary shaft fine-movement device for rotating a rotary shaft integrated with the tightening ring by moving a projection provided on the tightening ring substantially in a tangential direction of rotation of the tightening ring. A first male screw portion to be screwed, a fine moving shaft having a second male screw portion having a different screw pitch from the first male screw portion, and a female screw portion to be screwed to a second male screw portion of the fine moving shaft; Third
A middle cylinder having an external thread portion, and restricting the rotation of the middle cylinder so that the middle cylinder moves straight in the axial direction of the fine movement axis by the rotation of the fine movement axis. An outer cylinder having a rotation restricting member that allows movement, a female screw portion that is screwed into a third male screw portion of the middle cylinder, and an abutting portion that abuts on a projection of the tightening ring; A connection member for connecting the outer cylinder to the fine cylinder so as to be relatively movable in the axial direction of the fine movement axis and to allow relative rotation at a predetermined angle. 2. The screw pitch of the third male screw portion is set larger than a screw pitch obtained by subtracting a screw pitch of the second male screw portion from a screw pitch of the first male screw portion. Fine adjustment device for rotating shaft.