JPH0543374Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is based on the method of making the rotation axis of the theodolite, rangefinder and angle meter, etc. This invention relates to a fine movement device for rotation.

[Technical background] Surveying instruments are operated by fixing the rotating shaft and repeating fine movements, but in the past, the fixing means and the fine movement means were located at different locations, making operation inconvenient and making surveying work difficult. It was hurting efficiency. In order to solve this problem, a fixed fine movement device has appeared in which both the fixed and fine movement means are combined into a coaxial system, but it is desired to realize a fine movement device that further streamlines the repeated fine movement operations.

[Purpose] This invention was made in response to these demands, and it is possible to achieve quick and accurate fine movement by coaxially disposing fine movement means in addition to the conventional coaxial type fixed fine movement device. The purpose of this invention is to provide a fine movement device that can be operated with good workability.

[Summary of the invention] The fine movement device of this invention performs fine movement of the rotary shaft by pressing the fixed shaft as in the conventional system, but in order to achieve the above purpose, a coarse and fine movement mechanism and a fine movement mechanism arranged coaxially are used. are collectively constructed as described below, and a coarse and fine movement mechanism is used up to the final sighting position, and a fine and fine movement mechanism is used at the sighting position to enable rapid and precise sighting operations.

[Detailed explanation based on examples] In the commonly used fixed fine movement device, the first
Referring to the figure, a camshaft 4 is installed integrally with an arm 3a extending from a fixing member 3 into which a rotary shaft 2, which is rotatably supported on the survey instrument body frame 1, is loosely inserted. The fixing operation is performed by rotating the cam 5 and pressing the stopper 7 against the rotating shaft 2 via the push rod 6. This cam rotation is performed by the rotation of the fixed knob 10, and the rotation is transmitted via a universal joint 8 which is installed at both ends of the fixed shaft 9 to which the fixed knob 10 is attached and the cam 5 with setscrews 8a, 8a. .

Next, the fine adjustment device functions by rotating the fine adjustment knob 11 in such a fixed state, and the arm 3a, which is pressed by the spring 13 attached to the main body frame 1 with the spring support tubes 14a and 14b, uses the force of this spring. The rotating shaft is made to move slightly (small rotations) by pressing against it, and the fixed shaft 9 is pressed by the threaded movement of the screw body as the fine adjustment knob rotates, and this pressing force is applied to the tip of the fixed shaft 9. It is formed so that it is transmitted to the arm 3a via a center pin 12 which is held between the camshaft 4 and the camshaft 4 as shown in the figure. When the fine adjustment knob is screwed back due to reverse rotation, the above spring 1
As in the conventional method, a pressing force in the opposite direction is applied to the arm 3a by the force of 3, thereby causing slight movement of the rotating shaft.

In the fine movement device of the present invention, fine movement of the rotary shaft is similarly performed by pressing the fixed shaft 9, but it is characterized in that the pressing is performed by both the coarse and fine movement functions described below. be.

A cylindrical guide shaft 15 is provided, into which the fixed shaft 9 is loosely inserted so as to freely rotate and slide, and in which a guide pin 16 is implanted. The fixed shaft 9 is fixed by this guide cylinder shaft 15.
In the illustrated embodiment, a thrust bearing 17 is interposed between the large diameter portion of the fixed shaft 9 near the tip and the tip of the guide cylinder shaft 15, so that the rotation and sliding are performed smoothly. It is arranged like this.

Next, the fine movement threaded cylinder 18 into which the guide cylinder shaft 15 has been loosely inserted is screwed into the main body frame 1 with the coarse and fine movement screw 19. In this embodiment, this screw insertion is performed via a support tube 1' which is screwed and fixed to the main body frame 1. The guide pin 16 is formed to pass through the pin hole 20 as shown in the figure.

Furthermore, a fine fine adjustment tube 22 is provided, into which the fine adjustment screw tube 18 is loosely inserted, and the fine adjustment knob 11 is screwed and fixed at the rear end thereof. Then, as shown in the figure, the guide pin 16 is loosely fitted through the guide hole 21 provided along the circumferential direction of the cylinder of the fine movement cylinder 22, and when the fine movement knob 11 is turned, the fine movement cylinder 22 By rotating the guide pin 16, the guide cylinder shaft 15 is fed (back and forth), and the fixed shaft 9 is pressed for fine movement. Here, 23 is a ring screw fixed to the rear end portion of the fine adjustment threaded cylinder 18 to prevent the fine adjustment cylinder 22 from coming off.

The above is a fine movement mechanism at the final sighting position where the guide pin 16 is slidably guided within the guide hole 21.
On the other hand, a coarse and fine movement mechanism is formed in a state in which the guide pin 16 is locked to one end of the guide hole 21.
To explain this in detail, microtremors only require the target object to move within the field of view of the surveying instrument's telescope, so the movement of microtremors is small. For example, since the field of view of the telescope of this surveying instrument is generally about 1°30', the amount of movement of the micro-movement caused by the guide hole 21 is as shown in the guide hole 2.
The amount of inclination is about 0.1mm for the length of 1. Since it is a fine movement mechanism, the range of fine movement can be narrow. Therefore, there is almost no inclination of the guide hole 21 along the circumferential direction of the cylinder of the fine movement tube 22, and the guide hole is in the circumferential direction in the drawing. It is expressed as an amount with almost no inclination. Therefore, the inclination cannot be shown in the drawing. This slight amount of inclination generates the pressing force necessary for fine movement. At this time, if you turn the fine adjustment knob 11,
The fine and fine movement cylinder 22, the guide pin 16, the guide cylinder shaft 15, and the fine movement screw 18 rotate together, and the coarse and fine movement screw 19 rotates together.
As a result, the fine adjustment screw cylinder 18 is screwed forward (retracted) to press the fixed shaft for coarse and fine movement of the rotary shaft, thereby enabling rapid sighting operation to the final sighting position.

[Effect] As explained above, the fine movement device for the rotating shaft of a surveying instrument according to the present invention has both coarse and fine movement functions, whereas the conventional system only has a single fine movement function. This enables quick and precise collimation, making it useful for highly workable precision surveying.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a fixed fine movement device using the present invention, and FIG. 2 is an exploded perspective view showing the main parts of the present invention. 1...Body frame, 2...Rotating axis, 9...Fixed axis,
11... Fine movement knob, 15... Guide cylinder shaft, 16...
...Guide pin, 18...Fine movement screw tube, 20...Pin hole, 21...Guide strip hole, 22...Fine fine movement tube.

Claims (1)

[Scope of utility model registration request] A cylindrical guide in which the fixed shaft is loosely inserted and a guide pin 16 is implanted so that the fixed shaft 9 can be pressed, in a fine movement device for a surveying instrument rotating shaft that makes minute rotations of the rotating shaft by pressing the fixed shaft 9. A cylinder shaft 15, a fine adjustment threaded cylinder 18 screwed into the main body frame 1, into which the guide cylinder shaft 15 was loosely inserted and the guide pin 16 loosely fitted therein, and the fine adjustment screw cylinder 18 was loosely inserted and the fine adjustment knob 11 was fixed. The guide pin 16 is loosely fitted into a guide hole 21 formed with a slight inclination along the circumferential direction of the cylinder of the fine movement cylinder, and the guide pin 16 is provided with a fine movement cylinder 22, and the guide pin 16 is loosely fitted into a guide hole 21 formed with a slight inclination along the circumferential direction of the cylinder of the fine movement cylinder. Guide cylinder shaft 1 by pin
5. A fine adjustment device for a rotating shaft of a surveying instrument, characterized in that the fixed shaft is pressed for fine and fine movements through the feed of step 5, and the pressing for coarse and fine movements is performed in a row manner through the screw advance of a fine adjustment screw cylinder 18.