JPH0637285Y2 - Rotating axis fine movement device of surveying instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fine movement device for a rotary shaft of a surveying instrument for angle measurement such as a transit and a theodolite, mainly for a rotary shaft of a telescope.

(Prior Art) An angle-measuring device such as a transit, a theodolite, or a total station having a light-wave distance measuring unit is configured such that its collimating telescope can be rotated about a vertical axis and a horizontal axis. Since these angle measuring devices require angle measuring accuracy in units of seconds, each rotating shaft is provided with a fine movement device for finely rotating the collimation telescope.

As the fine movement device, various devices have been put to practical use and proposed. For example, a fine movement device for elevation angles disclosed in Japanese Patent Publication No. 56-36362, that is, a fine movement device for finely rotating a collimating telescope about a horizontal axis is a fine movement device of a telescope rotatably supported by a support column. A tightening frame loosely fitted to the rotating shaft,
A tightening operation means for tightening the tightening frame and the rotating shaft,
For tightening the tightening operation means connected to the tightening operation means through a universal joint to operate the tightening operation means and the tightening frame tightened on the rotating shaft about the axis of the rotating shaft. The fine movement moving means and the fine movement operating means for operating the fine movement operating means are provided, and the tightening operation shaft of these tension operating means and the fine movement shaft of the fine moving operating means are coaxial with each other.

Further, the fine movement shaft has a distal end portion in which an armature member is loosely fitted, and a micro male screw portion to be screwed into a micro female screw portion formed in the tightening operation shaft is formed in a central portion thereof. The fine movement means has an arm member provided on the tensioning frame, one end of which is in contact with the armature member and the other end is in contact with the arm member, and the fine movement means is substantially perpendicular to the feeding direction of the fine movement shaft. Further, it has a rotation lever means having a rotation axis substantially perpendicular to the rotation axis of the telescope, and a spring for constantly applying a unidirectional rotation force to the arm member.

Further, the tensioning operation means of the conventional fine movement device is configured by pressing a concave flange formed on the head of the tensioning frame to the butting plate fixed to the rotary shaft end of the telescope in the axial direction of the rotary shaft. It is configured to clamp the frame to the axis of rotation of the telescope. A female screw is formed on the tension frame head coaxially with the rotary shaft of the telescope, and a nipple male screw is screwed onto the female screw so as to contact the rotary shaft end of the telescope via a hard ball. By rotating the nipple male screw, it advances itself toward the telescope rotation axis. The concave flange presses against the butt plate.

Further, the tightening operation means has a tightening operation shaft having a tightening knob, and a first spur gear is formed at an end portion of the tightening operation shaft, and the first spur gear is an axis coaxial with the telescope rotation shaft. It is screwed with a second spur gear provided on the support column so as to be rotatable around it.
The second spur gear is connected to the nipple male screw via a universal joint. As a result, the tightening frame is tightened on the rotation axis of the telescope by rotating the tightening knob.

On the other hand, the fine movement shaft is rotated by turning the fine movement knob of the fine movement operation means, and the fine movement shaft is advanced by the micro male screw part thereof, and the rotation lever means is rotated around the axis through the armature member. The collimating telescope is rotated slightly about its axis of rotation by rotating the tensioning frame clamped to the axis of rotation of the telescope by the rotation of the means against the spring force.

The universal joint of the conventional fine movement device is provided with the second spur gear even if the telescope rotary shaft and the second spur gear are misaligned due to the axial adjustment of the telescope rotary shaft during assembly and adjustment of the surveying instrument. It is provided in order to be able to transmit the rotational force of (1) to the nipple male screw which is integral and coaxial with the telescope rotation shaft. If this axial misalignment is not considered, the four axes of the telescope, the tension frame, the nipple male screw, and the second spur gear are all coaxial with each other as described above, so the nipple male screw and the second spur gear are all coaxial. The gears do not need a universal joint, and even if they are integrally formed with each other, there is no problem in the tightening action.

(Problems to be solved by the invention) In the above-mentioned conventional device, when the tension frame is clamped on the telescope rotation shaft, the tension frame moves and projects in the telescope rotation axis direction by the rotation feed action of the male nipple screw. This means that the nipple male screw must be rotated many times for pressure contact with the mating plate, that is, many rotations of the tightening knob are required. This many rotations of the tension knob not only eliminates quick tensioning movements, but also reduces the efficiency of the surveying work, and it takes a long time to touch the surveying instrument body via the tension knob, which Proportionately, the time that external force is applied to the surveying instrument body also increases. For this reason, even if the telescope is collimated to the survey target, this external force causes a collimation deviation, forcing re-collimation, which leads to a reduction in the surveying work efficiency and a surveying error.

Further, as described above, the tightening operation shaft having the tightening frame and the tightening knob tightened on the telescope is a nipple male screw, a universal joint,
Since the gear train including the second spur gear and the first spur gear is always connected, the minute rotational force of the telescope by the fine movement operation means is transmitted to the tension operation means as it is. For this reason, the fine movement operation force needs not only to overcome the spring force but also to rotate the tension operation shaft including the gear train and the tension knob. A part of the operating force acts as an undesired external force on the surveying instrument body, which also has a drawback that causes a surveying error.

The present invention has an object to eliminate such drawbacks, and the number of rotations of the tensioning knob for the tensioning operation is small and extremely light, which may result in a surveying error by the tensioning operation. An object of the present invention is to provide a rotary shaft fine movement device of a surveying instrument having a tightening device that does not have the above.

(Means for Solving the Problem) Means of the present invention for solving the above-mentioned problems include a tightening frame loosely fitted to a rotary shaft of a telescope rotatably supported by a support column, and the tightening frame. A tensioning operation means for tensioning the frame to the rotating shaft, a universal joint connected to the tensioning operation means, and a universal joint connected to the universal joint via a connecting member for operating the tensioning operation means. Tensioning operation means, fine movement means for finely rotating the tensioning frame clamped to the rotary shaft around the axis of rotation, and an arm member for operating the fine movement means. And a fine-movement operating means connected via the push-rod for pushing the rotary shaft in a direction orthogonal to the push-rod, the push-rod being provided in the tension frame, and the push-rod. The axis of the rotary shaft of the tensioning frame for moving in the pressing direction And a cam means rotatably supported at a position, wherein the universal joint has one end connected to the cam means and the other end connected to the tightening operation means. It is a rotary axis fine movement device.

(Operation) During tightening, by rotating the tightening operation shaft, the cam means is rotated via the universal joint to move the push rod in the pressing direction, and the tightening frame is tightened on the rotation axis of the collimating telescope. To do.

In order to slightly rotate the collimating telescope about its rotation axis, the fine movement operating means is operated.

At this time, the rotation of the tension frame is absorbed by the universal joint interposed between the cam means and the tension operation means and is not transmitted to the tension operation means. For this reason, the fine movement operation force only needs to have a sufficient amount of force to rotate the tightening frame, and an extremely small amount of force is required. Therefore, unlike the conventional device, there is no fear that the precision of the measurement may be deteriorated due to the fine operation force.

Further, a tightening actuating means for tightening the tightening frame to the collimating telescope rotation shaft, a cam means, and a push rod for pressing the collimating telescope rotation shaft from a direction substantially orthogonal thereto by a rotation thereof. With this configuration, the amount of movement of the push rod for pressing the collimating telescope rotation shaft, that is, the required rotation angle of the cam means can be reduced, and thus the rotation angle of the tension operation shaft can be reduced as compared with the conventional device. . As a result, quick tightening operation is possible, the surveying work efficiency can be improved, and the time when the surveying instrument is touched via the tensioning knob can be made extremely short. The time to add can be shortened, and the measurement error can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the appearance of a total station as an example of a surveying instrument in which a rotary shaft fine movement device according to the present invention is incorporated.

A telescope unit 3 having a built-in lightwave distance measuring unit is rotatably supported around the horizontal axis between the support columns 1 and 2, and the entire support unit including the support columns 1 and 2. Are rotatably supported on the substrate 7 about a vertical axis. First
In the figure, the telescope section is in the "positive position". On the right column 1, there are arranged various distance measurement / angle measurement switch key groups 4 and a display unit 5 for displaying angle measurement / distance measurement data. Inside the column, an electric circuit 10 for driving and controlling them is provided as an arithmetic circuit. It is incorporated with the means 9. On the other hand, the left column 2 has a built-in encoder device 11 for measuring elevation angles and a device for fine rotation about a horizontal axis. Further, an operation knob 6 for high and low fine movements is arranged in the lower part of the suspension, and a fine movement operation knob 8 centered on a vertical axis is provided at a lower position on the objective lens side of the telescope section 3 in the same direction as the operation knob 6. Are arranged.
With such a configuration, the operator can perform all operations of the telescope, the switch key switching operation, the fine movement operation of the elevation angle, and the fine movement operation of the vertical axis rotation with one hand only with the right hand.

2 to 4 are views showing a first embodiment of a horizontal axis rotary fine movement device according to the present invention, which is used at the time of elevation angle measurement, and FIG. 2 is a longitudinal sectional view thereof, and FIG. FIG. 4 is a left side view showing a partially cutaway sectional view, and FIG.

The horizontal rotary shafts 20 and 21 attached to the telescope unit 3 are rotatably supported by bearings 22 and 23 attached to the support columns 1 and 2, respectively. On the rotary shaft 20 on the left support 2 side,
A code plate mounting plate 24 to which the code plate 11 'of the encoder 11 is mounted is fixed by screws 25. Also, the rotary shaft 20
A tension frame 26 having an arm portion 27 is rotatably loosely fitted therein. A through hole 28 is formed in the arm portion 27 of the tension frame 26 toward the axial center of the rotary shaft 20, and a push rod 29 is movably inserted into the through hole 28. One end of the push rod 29 has a window 30 formed at the inner end of the through hole 28.
It is in contact with the top 31 inserted into the push rod 29.
The top 31 is pressed against the rotary shaft 20 by the movement of the inward direction.

A bearing hole 33 is formed in the lateral flange portion 32 of the arm portion 27, and the first rotating plate having the convex rail 35 in the bearing hole 33.
A shaft 36a of 36 is rotatably fitted and supported by a shaft. This shaft 36a
A cam plate 37 having a curved surface portion 37a whose radius gradually increases is fixed to the tip of the with a screw 38. And
The curved surface portion 37a of the cam plate 37 is formed by the push rod 2 described above.
It is in contact with the other end of 9. The convex rail 35 of the first disc 36 is slidably fitted to the concave rail 40a of the intermediate disc 40 having a complementary shape, and the intermediate disc 40 is convex rail 40b orthogonal to the concave rail 40a. On the other side. The convex rail 40b of the intermediate disc 40 is the second rail having the lever 41a.
It is slidably fitted into a concave rail 41b formed on the disc 41. The shaft portion 41c of the second disc 41 is fitted into the shaft hole 43a of the bearing member 43 fixed to the suspension strut 2 by the screw 42, and the shaft portion 4c.
A disc 45 is attached to the tip of 1c with a screw 44. The first disc 36, the intermediate disc 40, and the second disc 41 described above constitute an Oldham coupling 34 which is a kind of universal joint.

At the end of the lever 41a of the second disc 41, the crank arm 46
A shaft member 47 rotatably inserted in a hole formed at one end of the
The shaft 47a of the shaft member 47 is rotatably fitted and inserted into the shaft member 47a of the shaft member 47.
The shaft member 48 is caulked to the shaft. Similarly, the other end of the crank arm 46 is also attached to the end of the lever arm 49 by the shaft member 50.
And 51 and the pipe member 52 are rotatably connected. The lever arm 49 is fixed to the stepped portion 60a formed at the tip of the tightening operation tube 60 by the shaft hole 49a. A tightening operation knob 61 is screwed onto the other end of the tightening operation tube 60. Also, the inner hollow part of the tension operation tube 60
A micro female screw portion 60c is formed on 60b, and a micro male screw portion of a fine movement shaft 63 having a fine movement knob 62 at one end is formed on the micro female screw portion 60c.
63a is screwed together, and the fine movement shaft 63 and the tightening operation tube 60 have a coaxial structure. One end of the armature member 64 is loosely fitted in the recessed hole 63b formed at the tip of the fine movement shaft 63 so that the tip can be swung.

On the other hand, below the lateral flange 32 of the tension frame 26, a stepped screw is
An arm member 71 as shown is attached by 70.
A pin 72 is planted at the lower end of the arm member 71. Then, below the arm member 71, the above-mentioned boom member is provided.
A rotating lever member 73 having an arm portion 73b in which a recessed portion 73a with which 64 abuts is formed and an arm portion 73d in which a pin 73c is implanted is rotatably supported by a shaft 74 implanted in the device housing. Installed. The pin 72 of the arm member 71 is pulled in the rotational tangential direction of the tension frame 26 by a spring 75 applied to the stepped screw 70 so that the pin 72c of the rotary lever member 73 always contacts the side surface of the pin 73c.

The operation of this embodiment having the above configuration will be described below.

In order to make a slight rotation of the horizontal shaft 20 having the telescope 3, first, the tightening operation knob 61 is turned to rotate the lever arm 49 in the direction of arrow A in FIG. 3, and this rotation is performed via the crank arm 46. Lever 41 of second disc 41 of Oldham coupling 34
The second disc 41 is rotated in the direction of arrow B by transmitting to a. The rotation of the second disc 41 in the arrow B direction is transmitted to the cam 37 via the Oldham coupling 34, and the cam 37 is similarly rotated in the arrow B direction. As a result, the curved surface portion 37a of the cam 37 pushes up the push rod 29, and the top 31 presses the peripheral wall surface of the shaft 20 to tighten the tightening frame 26 to the shaft 20.

Next, when the fine movement knob 62 is turned and the fine movement shaft 63 is fed in the direction of the arrow C by the micro screws 63a and 61c, the boom member 6
The rotating lever 73 is rotated by 4 in the direction of arrow D in FIG. By the rotation of the rotary lever 73, the pin 73c pulls the pin 72 of the arm member 71 in the direction of arrow F in FIG. 3 against the tensile force of the spring 75. As a result, the tension frame 26 is rotated in the direction of the arrow F, and the shaft 20 is slightly rotated about its axis. Further, in order to rotate the shaft 20 in the reverse direction, if the fine movement knob 62 is rotated in the reverse direction, the fine movement screw retracts, and the pulling action of the arm member 71 of the rotating lever 73 is released. Fixed frame 26 is arrow F
And is rotated in the opposite direction.

5 and 6 show a second part of the rotary shaft fine movement device according to the present invention.
FIG. 5 is a side view and FIG. 6 is a longitudinal sectional view thereof. This embodiment shows an embodiment in which the fine movement operating portion and the tension operation portion do not have to be coaxially arranged as in the first embodiment, and is the same as the first embodiment. Or, equivalent components are given the same reference numerals and the description thereof is omitted.

Push rod that slides in the through hole of the arm 27 of the tension frame 26
The lower end of 29 is in contact with the peripheral wall surface of the eccentric disc cam 100 pivotally supported by the arm 27. The end of the shaft 101 of the eccentric disc cam 100 is connected to the shaft 104 of the tension knob 103 via a universal joint 110, a connecting rod 102, and another universal joint 111. And
By rotating the tension knob 103, its rotational force is transmitted to the eccentric disc cam via the universal joint 111, the connecting rod 102, and the universal joint 110, and it is rotated to push the push rod 29 upward. By raising and pressing the top 31 with which the upper end abuts against the shaft 20,
The tightening frame 26 is tightened on the shaft 20. On the other hand, the minute rotation of the shaft 20
By rotating the fine movement knob 62, the fine movement shaft 63 is fed, and the forward movement of the armature member is converted into the rotation of the rotary lever 73.
The rotation of 73 causes the pin 72 to move against the tensile force of the spring 75,
The tension frame 26 is rotated by pulling it toward you in the figure, and as a result, the shaft 20 is slightly rotated.

(Effect of the Invention) As described above, according to the present invention, at the time of tightening, by rotating the tightening operation shaft, the cam means is rotated through the universal joint to move the push rod in the pressing direction. , Tighten the tension frame to the axis of rotation of the collimation telescope. In order to slightly rotate the collimating telescope about its rotation axis, the fine movement operating means is operated.

At this time, the rotation of the tension frame is absorbed by the universal joint interposed between the cam means and the tension operation means and is not transmitted to the tension operation means. For this reason, the fine movement operation force only needs to have a sufficient amount of force to rotate the tightening frame, and an extremely small amount of force is required. Therefore, unlike the conventional device, there is no fear that the precision of the measurement may be deteriorated due to the fine operation force.

Further, a tightening actuating means for tightening the tightening frame to the collimating telescope rotation shaft, a cam means, and a push rod for pressing the collimating telescope rotation shaft from a direction substantially orthogonal thereto by a rotation thereof. With this configuration, the amount of movement of the push rod for pressing the collimating telescope rotation shaft, that is, the required rotation angle of the cam means can be reduced, and thus the rotation angle of the tension operation shaft can be reduced as compared with the conventional device. . As a result, quick tightening operation is possible, the surveying work efficiency can be improved, and the time when the surveying instrument is touched via the tensioning knob can be made extremely short. The time to add can be shortened, and the measurement error can be reduced.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an example of a surveying instrument in which a rotary fine movement device according to the present invention is incorporated, FIG. 2 is a longitudinal sectional view showing a first embodiment of the present invention, and FIG. 1 is a side view showing the first embodiment, FIG. 4 is an exploded perspective view showing the first embodiment, FIG. 5 is a side view showing the second embodiment of the present invention, and FIG. It is a longitudinal section showing a 2nd example. 2 …… Circle support, 3 …… Telescope part, 20 …… Rotary axis, 26 …… Tightening frame, 29 …… Push rod, 34 …… Oldham joint, 46 …… Crank arm, 61,103 …… Constant operation knob, 62 ... Fine movement operation knob, 63a ... Micro male screw part, 64 ... Inherit member, 71 ... Arm member, 73 ... Rotating lever, 100 ... Eccentric disc cam, 110, 111 ... … Universal joint.

Claims (1)

[Scope of utility model registration request] 1. A tightening frame loosely fitted to a rotary shaft of a telescope rotatably supported by a support column, and a tightening actuating means for tightening the tightening frame to the rotary shaft. A universal joint connected to the tensioning operation means, a tensioning operation means connected to the universal joint via a connecting member for operating the tensioning operation means, and the tensioning means fixed to the rotary shaft. The tensioning frame comprises fine movement means for finely rotating the tension frame about the axis of rotation, and fine movement operation means connected via an arm member for operating the fine movement means. The operating means includes a push rod provided on the tension frame for pressing the rotary shaft from a direction orthogonal to the push rod, and a shaft of the rotary shaft of the tension frame for moving the push rod in the pressing direction. And a cam means rotatably supported at an outer position. The rotational axis fine apparatus surveying instrument, wherein the the cam means and the clamping actuation means at the other end is connected there is connected to one end.