JPH0431546Y2 - - Google Patents

Description

[Detailed explanation of the invention] ``Field of application of the invention'' This invention is a fine movement device for rotating the direction of a telescope in surveying instruments such as theodolites and leveling instruments by a minute amount to position it in an accurate direction, especially a fine movement knob. This invention relates to a tightening device in a fine movement device in which a tightening knob and a tightening knob are disposed on the same axis.

``Prior art'' A conventional tightening device of this type was developed in 1983.
As disclosed in Publication No. 24098, an operating arm is rotatably attached to a central shaft that rotatably supports the main body casing, and an eccentric cam rotatably supported by a pivot is provided at the tip of the operating arm.
The pivot shaft of this eccentric cam is connected to a tightening shaft via a universal joint, and by rotating this tightening shaft, the eccentric cam is rotated, and the eccentric cam is attached to the actuating arm so that it can move forward and backward through an L-shaped lever in contact with the eccentric cam. A known device is known in which the actuating arm is tightened around the central axis by pressing a push rod forward and pressing a tightening piece disposed at the tip of the rod against the central axis.

``Problems to be solved by the invention'' The conventional device described above uses an eccentric cam, an L-shaped lever, etc. as a means to introduce the tightening force from the tightening shaft to the push rod, but the parts are difficult to process. In addition to requiring a large number of It was difficult to construct a structure that would smoothly increase and decrease, and sometimes it became impossible to tighten, or the tightening easily loosened.

"Means for solving the problem" This invention aims to solve the above-mentioned conventional problem.
In a tightening device in a fine movement device of a surveying machine, the base of the operating arm 5 is tightened via the tightening piece 7 by the advancement of a push rod 9 provided on the operating arm 5 so as to be movable in the axial direction thereof. A cavity 10 having an opening in the direction in which the rear end of the push rod 9 projects is provided, and an adjustment screw 11 is screwed into the opening of the cavity 10, and is also screwed into the cavity 10 onto the side surface of the actuating arm 5. The tip of the tightening force introduction screw 12 is provided so as to be protrusive, while the rear end surface 9' of the push rod 9 is provided with an inclined surface that faces obliquely to the tip surface of the tightening force introduction screw 12 and the tip surface of the adjustment screw 11. A steel ball 15 is disposed in the cavity 10 surrounded by the rear end surface 9' of the push rod, the distal end surface of the adjusting screw 11, and the distal end surface of the tightening force introducing screw 12, in contact with each of the end surfaces, and The rear end of the tightening force introduction screw 12 and a tightening shaft 17 provided on the main body casing 1 so as to be rotatable and moveable forward and backward are connected by a universal joint having a spherical pressing contact means such as a steel ball 33 along the shaft. The present invention aims to provide a tightening device for a fine movement device of a surveying machine, which is characterized by being connected with a main body casing. To provide a tightening device which enables one smooth fine movement and which can be constructed using parts that can be easily processed by simple processing without requiring processing and assembly precision.

``Example'' Below, an example of this invention shown in the drawings will be described.A main body casing 1 of a surveying instrument equipped with a telescope is rotatably supported on a bearing 3 about a central axis 2. A tightening ring 4 is rotatably attached to the holder.

An operating arm 5 is provided on a part of the outer periphery of the tightening ring 4 in a manner perpendicular to the central axis 2 and protrudes from a portion thereof.
A recess 6 is provided in the inner circumference of the tightening ring 4 at the base of the tightening ring 4 , and a tightening piece 7 is disposed within the recess 6 .
It is fitted so that it can move forward and backward slightly in the orthogonal direction.
A through hole 8 is formed inside the actuating arm 5 and communicates with the recess 6 in the direction of its protrusion, into which a push rod 9 is inserted so as to be movable forward and backward. 5
A cavity 10 communicating with the through hole 8 is formed at the tip. A screw hole-shaped opening is provided in the hollow portion 10 along the direction in which the rear end of the push rod 9 projects. The push rod 9 is configured such that a key pin 14 is cased in an axially long key groove 13 provided on the outer periphery so as to slide in the axial direction without rotating.

An adjustment screw 11 is screwed into the opening of the cavity 10, and a tightening force introducing shaft 12 screwed into the side of the actuating arm 5 is screwed into the side of the cavity 10.
The tip of the push rod 9 is provided such that it can protrude perpendicularly to the axial direction of the push rod 9.

The rear end surface 9' of the push rod 9 is provided with an inclined surface that faces obliquely to the distal end surface of the tightening force introducing shaft 12 and the distal end surface of the adjustment screw 11, and the steel disposed in the cavity 10 A ball 15 is surrounded by the rear end surface 9' of the push rod, the distal end surface of the adjusting screw 11, and the distal end surface of the tightening force introducing shaft 12, and is held in contact with each end surface on three sides of the circumference. In the illustrated embodiment, the rear end surface 9' of the push rod 9
is formed into an inclined surface that faces diagonally at an angle of 45 degrees to the distal end surface of the tightening force introduction shaft 12 and the distal end surface of the adjustment screw 11.

On the other hand, a fine movement shaft 16 and a tightening shaft 17 are coaxially disposed in a portion of the main body casing 1 facing the rear end of the tightening force introducing shaft 12.

The fine movement shaft 16 is formed into a hollow tube shape with a male thread 16 on the outer periphery, and its tip is screwed into a threaded hole 20' of a screw receiver 20 that fits into the receiving hole 18 of the main body casing 1 and is fixed with a set screw 19. It is configured to move forward and backward in the axial direction by rotating a fine movement knob 21 attached to the rear end, and a fine movement inner shaft 22 is fitted inside the fine movement knob 21, and the fine movement shaft 16 rotates around this fine movement inner shaft 22. I'm starting to do that.

The fine movement inner shaft 22 is a hollow tube with a female thread 24 formed on the rear inner periphery of a hollow hole 23, and a flange 25 for locking the tip of the fine movement shaft 16 inside the main body casing 1 is provided at the tip thereof. The rear end of the fine movement shaft 16 is prevented by a locking ring 27 that engages in a snap-like manner with the circumferential groove 26, and a notch 28 is provided on the outer periphery of the flange 25, in which a screw receiver is provided. A guide pin 29 protruding from 20 in parallel with the fine movement inner shaft 22 is engaged. Therefore, when the fine movement knob 21 is rotated left and right, the fine movement shaft 16 rotates around the fine movement inner shaft 22 and moves toward the guide pin 29.
It moves forward and backward together with the fine movement inner shaft 22 whose rotation is prevented.

The tightening shaft 17 is inserted into the hollow hole 23 of the fine adjustment inner shaft 22, and the male screw 30 provided at the rear end is screwed into the female screw 24 of the fine adjustment inner shaft 22 to rotate the tightening knob 31 attached to the rear end. In particular, it is configured to move forward and backward in the axial direction. The distal end of the tightening shaft 17 protrudes from the distal end of the fine adjustment inner shaft 22 and is connected to a universal joint 3 that can be pressed into contact with a spherical surface such as a steel ball 33.
2 to the tightening force introducing screw 12.

Said universal joint 32 comprising spherical pressing contact means
A pin 36 provided perpendicularly to the tip of the tightening shaft 17 is pivotably supported in a receiving hole 35 provided at the rear end of a sleeve 34 in which a steel ball 33 is tightly fitted in the center of the interior, and Notch 3 provided at the tip of the sleeve 34
7, a pin 38 provided perpendicularly to the tightening force introducing shaft 12
is pivotably supported, and the tightening shaft 17 and the tightening force introduction shaft 12 are connected to each other with the steel ball 33 in the sleeve 34 sandwiched therebetween.
This structure connects the tightening shaft 17 and the tightening force introduction shaft 12 so that they can be bent freely under the pressure force, and can freely transmit the rotational force and the pressure force. and the tightening force introducing shaft 12
can be engaged with and detached from the notch 37 via a pin 38.

A cylindrical elastic support 39 attached to the main body casing 1 is in pressure contact with the other side of the actuating arm 5 via a compression spring 40 therein.

``Effect of the invention'' With the above configuration, when aiming the telescope of a surveying instrument, first loosen the tightening knob 31 and turn the telescope with the main body casing 1, which is free to rotate, in the target direction, and aim almost at the target. After positioning in the near direction, the tightening knob 31 is rotated in the fixed operation direction.

As a result, the tightening shaft 17 rotates in the fine adjustment inner shaft 22 and moves forward slightly due to the engagement between the female screw 24 and the male screw 30, and the universal joint 32 at the tip.
The tightening force introducing shaft 12 is rotated and advanced through.

At this time, the tightening shaft 1 provided in the main body casing 1
7 and the tightening force introducing shaft 12 provided on the actuating arm 5 are smoothly rotated together by a universal joint 32 that can make spherical contact via a steel ball 33 while receiving a pressing force from an elastic support pair 39.

The forward force of the tightening force introducing shaft 12 acts on the steel ball 15 and presses it, and the push rod 9 forms an inclined surface with the tip end surface of the adjustment screw 11 in contact with the steel ball 15.
In order to come into pressure contact with the rear end surface 9' and move the rear end surface 9' while sliding, the push rod 9 moves forward in the distal direction, tightens the tightening piece 7 to the bearing 3, and fixes the operating arm 5 integrally with the bearing 3. let

In this case, adjustment of the pressure contact movement between the steel ball 15 and the inclined rear end surface 9' of the push rod 9 with respect to the screwing amount of the tightening introduction screw 12 can be performed by adjusting the screwing of the adjustment screw 11. Even if there are variations in the machining accuracy of the tightening piece 7, the rear end surface 9' of the push rod 9, the steel ball 15, etc. with respect to the rotational movement of the hollow part 1 of the adjustment screw 11,
Since the optimum tightening position can be set by adjusting the forward and backward movement within 0, reliable tightening operation can be ensured.Moreover, when tightening, the inclined rear end surface 9 of the push rod 9 is caused by the reaction force of the tightening force. ' is in diagonal pressure contact with the steel ball 15, and since no rotational force is exerted on each end face of the tightening introduction screw 12 and adjustment screw 11 that the steel ball 15 is in pressure contact with, there is no fear that the tightening will loosen.

In this state, when the fine adjustment shaft 16 is rotated to the right or left using the fine adjustment knob 21 to move it forward or backward, the fine adjustment inner shaft 22, which is prevented from rotating by the guide pin 29, simultaneously moves forward or backward together with the internal tightening shaft 17. fall back.

When the fine adjustment inner shaft 22 moves forward, the tip of the tightening shaft 17 integrated therewith pushes out the operating arm 5 integrated with the tightening force introduction shaft 12 via the steel ball 33 of the universal joint 32, but the operating arm 5 Since it is fixed integrally with the bearing 3 as shown in FIG. 2, the main body casing 1 slightly rotates around the central shaft 2 using the operating arm 5 as a reaction wall (clockwise in the figure). Conversely, when the fine adjustment inner shaft 22 moves backward, the tightening shaft 17 integrated therewith tries to separate from the actuating arm 5 integrated with the tightening force introducing shaft 12 via the universal joint 32, but the other side of the actuating arm 5 Since the elastic support 39 which is in elastic contact with the side surface uses the actuating arm 5 fixed to the bearing 3 as a reaction wall and presses the main body casing 1 to the right in the figure with its spring 40,
As a result, the tightening shaft 17 is pulled back toward the actuating arm 5 together with the main casing 1, and as a result, the main casing 1 slightly rotates counterclockwise in the figure.

In this way, by rotating the fine movement knob 21 left and right, the main body casing 1 can be slightly rotated left and right, and the telescope attached thereto can be accurately sighted in the target direction.

In this case, when the tightening shaft 17 slightly rotates with the main body casing 1 relative to the actuating arm 5, the tightening shaft 17 and the tightening force introduction shaft 12 are smoothly bent with the steel ball 33 in spherical contact as a boundary. This allows for delicate fine rotational adjustments.

In addition, since the fine adjustment knob 21 has a larger external shape than the tightening knob 31, delicate fine adjustment can be easily performed.Moreover, when the fine adjustment shaft 16 is rotated, the tightening shaft 17 is moved by the guide pin 29. Since rotation is prevented, the fine movement operation can be reliably performed without the actuating arm 5 being loosened.

In addition, the tightening force introducing shaft 12 of this invention is a universal joint according to the present invention that is used as a tightening shaft in a fine movement device in which a female threaded hole is provided at the center of the tightening shaft as in the conventional case, and a fine adjustment screw is screwed into this female threaded hole. It may also be connected via.

"Effects of the Invention" As described above, according to the fastening device for the fine adjustment device of the surveying instrument of the invention, in the fastening device for the fine adjustment device of the surveying instrument, the base of the operating arm 5 is fastened via the fastening piece 7 by the advancement of the push rod 9 provided on the operating arm 5 so as to be movable forward and backward in the axial direction of the operating arm 5, a hollow portion 10 having an opening in the direction in which the rear end of the push rod 9 projects is provided at the tip of the operating arm 5, and an adjustment screw 11 is screwed into the opening of the hollow portion 10, and the adjustment screw 11 is screwed into the opening of the hollow portion 10.
The end of the tightening force introduction shaft 12 screwed into the side surface of the operating arm 5 is provided so as to be able to protrude, while a slanted surface is provided on the rear end surface 9' of the push rod 9, which is obliquely opposed to the end surface of the tightening force introduction shaft 12 and the end surface of the adjustment screw 11, and the hollow portion 10 surrounded by the rear end surface 9' of the push rod, the end surface of the adjustment screw 11, and the end surface of the tightening force introduction shaft 12 is formed.
Since the forward force of the tightening force introduction shaft 12 caused by tightening acts smoothly on the steel ball 15 and presses it, smoothly and strongly pressing the rear end surface 9' of the push rod 9 which forms an inclined surface with the tip surface of the adjusting screw 11 which contacts the steel ball 15, the operating arm 5 is fixed. In this case, the inclined rear end surface 9' of the push rod 9 presses against the steel ball 15 at an angle,
Since the steel ball 15 is pressed against the tip surface of the adjusting screw 11 and the tip surface of the tightening force introduction shaft 12 and is stabilized, the tightening force of the adjusting screw 11 and the tightening force introduction shaft 12 will not loosen even if a reaction force is received from the push rod 9, thereby achieving a smooth and reliable tightening action.

Furthermore, since the pressure contact between the steel ball 15 and the rear end surface 9' of the push rod 9 can be adjusted by adjusting the screwing amount of the tightening force introducing screw 12 by screwing in the adjusting screw 11, rotational movement of the tightening force introducing shaft 12 can be performed. Even if there are variations in the machining accuracy of the tightening piece 7, the rear end surface 9' of the push rod 9, the steel ball 15, etc., the optimum tightening state can be achieved by adjusting the movement of the adjustment screw 11 back and forth into the cavity 10. Therefore, it has the effect of ensuring reliable tightening operation, and even if there are some errors in the accuracy of the rear end surface 9' of the push rod 9, the steel ball 15, etc., it is possible to ensure a stable and reliable tightening operation. Since tightening is possible, the tightening force introducing shaft 12, adjustment screw 11, and steel ball 15 are used.
These can be easily and inexpensively processed, and their assembly is also simple, which has the effect of reducing manufacturing costs.

Further, in the present invention, the tightening force introducing screw 12 and the tightening shaft 17 provided in the main body casing 1 so as to be freely rotatable and moveable forward and backward are formed by a universal joint equipped with a spherical pressing contact means such as a steel ball 33. Because of the connected structure, when the tightening shaft 17 is rotated and tightened, it can smoothly bend while receiving the pressing force and transmit the rotation to the tightening force introducing shaft 12, and the main body tightening the actuating arm 5 can be smoothly bent while receiving the pressing force. During fine rotational operation of the casing 1, the tightening shaft 17 and the tightening force introducing shaft 12 are smoothly bent to maintain the connection through the spherical pressing contact means such as the steel ball 33, so that delicate fine rotational adjustment is possible. It has the effect of making it possible, and
Since the steel balls 33 and the like can be easily and inexpensively processed, and the structure is simple and assembly thereof is easy, manufacturing costs can be reduced.

[Brief explanation of the drawing]

The figure is a partial longitudinal sectional plan view showing the main parts of an embodiment of this invention. 1... Main body casing, 5... Operating arm, 7
...Tight frame, 9...Putshurotsudo, 9'...
Rear end surface of push rod, 10... Cavity part, 11
...Adjustment screw, 12...Tightening force introduction shaft, 15...
Steel ball, 16... Fine movement axis, 17... Tightening axis, 20...
...Screw receiver, 20'...Screw hole, 21...Fine movement knob, 22...Fine movement inner shaft, 31...Tightening knob,
32... Universal joint, 33... Steel ball.

Claims (1)

[Scope of utility model registration request] In a tightening device in a fine movement device of a surveying machine, the base of the operating arm 5 is tightened via the tightening piece 7 by the advancement of a push rod 9 provided on the operating arm 5 so as to be movable in the axial direction thereof. a cavity 10 having an opening in the direction in which the rear end of the push rod 9 projects;
An adjustment screw 11 is screwed into the opening of the hollow portion 10, and the tip of a tightening force introduction screw 12 screwed into the side surface of the actuating arm 5 is provided in the hollow portion 10 so as to be able to protrude, while the rear end surface 9 of the push rod 9 ' is provided with an inclined surface that faces obliquely to the distal end surface of the tightening force introducing screw 12 and the distal end surface of the adjusting screw 11, and the rear end surface 9' of the push rod, the distal end surface of the adjusting screw 11, and the tightening force introducing screw 12 A steel ball 15 is disposed in the cavity 10 surrounded by the end surfaces of the hollow portion 10 in contact with each end surface, and the tightening force introducing screw 12 and a tightening force provided on the main body casing 1 so as to be freely rotatable and moveable forward and backward. The shaft 17 and the steel ball 33
1. A tightening device in a fine movement device of a surveying instrument, characterized in that the tightening device is connected by a universal joint having a spherical pressing contact means such as the above.