JPH0630710U - Rotating shaft fixing device in surveying instrument - Google Patents

Abstract

(57) [Summary] [Purpose] A coaxial fixing and fine-moving rotary shaft fixing device that contributes to quick surveying work by increasing the clamping force between the fixed ring and the rotary shaft without increasing the number of parts and assembly work. I will provide a. The rotary shaft fixing device 10 includes a fixed ring 12 surrounding the rotary shaft 11, one metal plate 13 that comes into contact with a part of the outer peripheral surface of the rotary shaft 11, and one metal plate 13 that is attached to the rotary shaft 11 side. The push rod 14 that pushes the push rod 14, the eccentric cam 15 that pushes the push rod 14, and the operating rod 16 that operates the eccentric cam 15.
And a slit 13c in the pressing direction applied from the push rod 14 is formed on the rotary shaft pressing surface 13b side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a rotary shaft fixing device in a surveying instrument.

[0002]

[Prior art and its problems]

 Generally, a surveying operation using a surveying instrument starts by collimating a measuring point with the surveying instrument. In order to adjust the collimation of this station with high accuracy, first roughly collimate and then fix the telescope. Next, perform the work to accurately match the measuring point with the fine movement device.

As shown in FIG. 5, a device for fixing a rotary shaft has heretofore been provided with a fixed ring 32 arranged in a housing 30 of a surveying instrument and surrounding a rotary shaft 31 such as a telescope, and the rotary shaft 32. An abutment 33 that abuts a part of the outer peripheral surface of 31, a push rod 34 that presses the abutment 33 toward the rotary shaft 31, a cam 35 that pushes the push rod, and a cam 35 that operates the cam 35. The operating rod 36 (fixing device) and the operating rod 36 are coaxially provided with a fine moving rod 40 (fine moving device) coaxial with the fine operating knob 39 at one end. Then, by rotating the fixing knob 37, the operating rod 36 is rotated and the push rod 34 is pressed by the cam 35, and the metal plate 33 is pressed against the rotary shaft 31 to bring the rotary shaft 31 and the fixed ring 32 into close contact with each other. Fixed. Reference numeral 38 in FIG. 5 is a fine movement spring, and the fine movement rod 40 is moved by the rotation of the fine movement knob 39 to finely rotate the fixed ring 32.

As described above, in the metal plate 33 used for the rotary shaft fixing device, the fixing device and the fine moving device are coaxial with each other, and the rotary shaft pressing surface 33 a and the push rod 34 are connected to each other. The contact surface 33b has a shape in the same direction, and it is pressed against the rotary shaft 31 only in the vertical direction X, and the rotary shaft 31 and the fixed ring 32 are tightly fixed and clamped. Therefore, the rotary shaft 31 is sandwiched between the dowel 33 and the fixed ring 32. However, since the pressing force applied from the dowel 33 to the rotary shaft 31 is in one direction, the rotary shaft 31 does not move. The pressing force in the rotation direction (radial direction) Y is weak, and the tight fixation is weakened, and there is the inconvenience that the fine adjustment device cannot be used and collimation becomes difficult.

For this reason, as shown in FIG. 6, the metal member 44 is divided into a first portion 44a which is directly pressed by the push rod 34, a second portion 44b and a third portion 44c which are pressed by the first portion 44a. A technique of dividing into three is known. According to this technique, the first portion 44a contacts the second portion 44b and the third portion 44c with the inclined surface, which causes the second portion 44b and the third portion 44c to move to the rotary shaft 31 and the fixed ring 32. And fix them tightly and clamp. At this time, the pressing force exerted on the rotary shaft 31 from the metal members 44b and 44c acts not only on the rotary shaft 31 in the vertical direction X but also in the rotational direction (radial direction) Y of the rotary shaft 31, so that the rotary shaft 31 is closely fixed. Can be reliably performed. However, in the technique of dividing the dowel 44 into a plurality of pieces as described above, the number of parts increases, the working of the divided dough becomes complicated, and the number of assembling steps also increases. .

The object of the present invention is to increase the clamping force between the fixed ring and the rotary shaft without increasing the number of parts and the number of assembling work, and to fix the coaxially fixed and fine-rotation rotary shaft that contributes quickly to the surveying work. To provide a device.

[0007]

[Means for Solving the Problems]

 A rotary shaft fixing device according to the present invention includes a fixed ring surrounding a rotary shaft, one metal plate that contacts a part of an outer peripheral surface of the rotary shaft, and one metal plate that presses the one metal plate to the rotary shaft side. A rotary shaft fixing device for a surveying instrument, comprising a push rod, a cam for pushing the push rod, and an actuating rod for operating the cam, wherein a radial component force is generated in the one dowel. It is characterized in that means for causing it is formed. It is preferable that the means for exerting a radial component force in this one metal member should have a slit formed in the pressing direction applied from the push rod on the rotary shaft pressing surface side.

[0008]

[Action]

 According to the present invention, the one metal contacting a part of the outer peripheral surface of the rotary shaft is provided with means for generating a component force in the radial direction, so that the pressing force applied from the metal core to the rotary shaft at this time is Not only the vertical direction with respect to the rotating shaft, but also the pressing force in the rotating direction (radial direction) of the rotating shaft acts, and the movement of the rotating shaft in the rotating direction can be restricted to ensure tight contact and fixation.

Particularly, when a slit is formed on the pressing surface side of the rotating shaft in the pressing direction applied by the push rod, the shape changed so that the metal plate pressed by the push rod expands at the slit portion and has some elasticity. Then, the rotary shaft is pressed in the vertical direction and the radial direction, and the movement of the rotary shaft in the rotational direction is restricted, so that the fixing can be performed more securely.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The parts, arrangements, etc. described below do not limit the present invention and can be variously modified within the scope of the present invention. 1 to 4 show one embodiment of the present invention, FIG. 1 is an overall view including a cross section of a main part of a surveying instrument, and FIG. 2 is a cross-sectional view of a main part of a coaxial fixing and fine-movement rotary shaft fixing device. 3 is a partially enlarged view of FIG. 2, and FIG. 4 is a perspective view of the metal.

FIG. 1 shows a state in which the theodolite 2 is arranged on the leveling table 1. In the theodolite 2 of this example, a gripping portion 4 is formed on an upper part of the housing 3, and the theodolite 2 is mounted on the housing 3. The telescope 5 is rotatably attached by a rotary shaft 11. Note that reference numeral 6 is a spherical-core telescope. The rotary shaft 11 is provided with a rotary shaft fixing device 10.

The rotary shaft fixing device 10 of the present embodiment mainly includes a fixed ring 12, a single metal plate 13, a push rod 14, a cam 15, and an operating rod 16. The fixed ring 12 of the present example is arranged so as to surround the rotating shaft 11, and a metal disposing portion 17 is formed on a part of a contact surface with the rotating shaft 11, and the metal disposing portion 17 is provided. A push rod disposing portion 18 is continuously formed on the shaft. Further, an extension portion 19 is formed at a predetermined position of the fixed ring 12, and the extension portion 19 is in contact with a fine movement rod 21 which constitutes a fine movement device. The fine movement device is a publicly known device including a fine movement rod 21, a fine movement knob 23, a fine movement spring 24, and an extension portion 19. By rotating the fine movement knob 23, the fine movement rod 21 is advanced and retracted to extend the extension portion. 19 is pressed to finely rotate the fixed ring 12 and finely adjust the rotary shaft 11 closely fixed to the fixed ring 12.

As shown in FIGS. 3 and 4, the metal plate 13 of the present embodiment has a flat contact surface 13a which is pressed by a push rod 14 described later, and is provided on the opposite side of the contact surface 13a. The rotating shaft pressing surface 13b, which is a surface, is formed as a curved surface along the outer peripheral surface of the rotating shaft 11, and a slit 13c is formed in the pressing direction applied from the push rod 14 on the rotating shaft pressing surface 13b side. . The slit 13c of this example is configured to widen toward the rotary shaft 11 side. The metal plate 13 is arranged in the metal plate mounting portion 17 of the fixed ring 12 and abuts a part of the outer peripheral surface of the rotary shaft 11.

The push rod 14 of this example is arranged in the push rod disposition portion 18 of the fixed ring 12, and the tip on the side of the metal plate 13 is a flat surface, and the contact surface of the metal plate 13 is the same. It is configured to press 13a. Further, the end portion on the side opposite to the metal 13 side is in contact with the cam 15 described below.

The cam of the present example is an eccentric cam 15 which is integrally attached to the operating rod 16 and is eccentrically attached to the operating rod 16. The eccentric cam 15 is in contact with the push rod 14. The operating rod 16 is rotatable on the housing 3, and its end portion extends outside the housing 3, and a fixed knob 25 and a fine movement knob 23 are coaxially attached thereto.

Next, the operation of the rotary shaft fixing device 10 having the above structure will be described. When the rotary shaft 11 of the telescope is fixed, the fixed knob 25 is rotated, but the rotation of the fixed knob 25 causes the operating rod 16 to rotate. The eccentric cam 15 integrated with the operating rod 16 rotates. When the eccentric cam 15 rotates, the push rod 14 presses the dowel 13. Then, the metal plate 13 pressed by the push rod 14 changes its shape so as to expand at the slit 13c and has some elasticity to press the rotary shaft 11 in the vertical direction X and the radial direction Y. It is also pressed to regulate the movement of the rotating shaft 11 in the rotation direction so that the contact and fixation can be performed more reliably. In this way, the rotating shaft 11 can be pressed by generating a component force not only in the vertical direction X 1 but also in the radial direction Y with respect to the rotating shaft 11.

[0017]

[Effect of device]

 According to the present invention, the one metal contacting a part of the outer peripheral surface of the rotary shaft is provided with means for generating a component force in the radial direction, so that the pressing force applied from the metal core to the rotary shaft at this time is Not only the vertical direction to the rotating shaft, but also the pressing force in the rotating direction (radial direction) of the rotating shaft acts to regulate the movement of the rotating shaft in the rotating direction to ensure the tight fixing of the fixed ring and the rotating shaft. Moreover, it can be constructed inexpensively without increasing the number of parts and the number of assembly work steps, which contributes to speeding up the surveying work.

[Brief description of drawings]

FIG. 1 is an overall view including a main section of a surveying instrument including a fixing device according to the present invention.

FIG. 2 is an explanatory cross-sectional view of an essential part showing a coaxial fixing and finely moving rotary shaft fixing device.

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a perspective view of a dowel 13.

FIG. 5 is a partially enlarged view similar to FIG. 3 showing a conventional example.

FIG. 6 is a partially enlarged view similar to FIG. 3 showing another conventional example.

[Explanation of symbols]

10 rotary shaft fixing device 11 rotary shaft 12 fixed ring 13,26 abutment 13a contact surface 13b rotary shaft pressing surface 13c slit (means for generating component force in radial direction) 14 push rod 15 cam 16 actuating rod 26a inclined push Rod contact surface (means to generate radial component force) Y Radial direction X Vertical direction

Claims (2)

[Scope of utility model registration request] 1. A fixed ring surrounding a rotary shaft, one metal plate that contacts a part of the outer peripheral surface of the rotary shaft, a push rod that presses the one metal plate toward the rotary shaft, and the pusher. In a rotary shaft fixing device for a surveying instrument, comprising a cam for pushing a rod and an operating rod for operating the cam, said one metal member is provided with means for generating a component force in a radial direction. A rotary shaft fixing device in a surveying instrument. 2. The rotation of the surveying instrument according to claim 1, wherein the means for exerting a radial component of force on the one dowel has a slit formed in the pressing direction applied from the push rod on the rotating shaft pressing surface side. Axis fixing device.