JPH04138311A - Lens barrel rotating device of surveying instrument - Google Patents

Abstract

PURPOSE:To make the switching operation between a manual operation and a motor driving easy by connecting an output shaft and the rotary shaft of a lens barrel through a flexible plate, and engaging the worm wheel of a gear box and the worm gear of a handle. CONSTITUTION:When a lens barrel 15 is rotated by the rotation of a motor 29, the torque of the motor 29 is transmitted to an input shaft 27 through a pulley 30, a belt 31 and a pulley 28. At this time, a worm gear 26 of a handle intermeshes with a worm wheel 25 of a gear box 22. Therefore, the gear box 22 is not rotated. An output shaft 33 is rotated through a speed reducing mechanism G by the rotation of the input shaft 27. An output shaft 33 and an output shaft 19 of the lens barrel 15 are engaged with a coupling through a coupling 40, a rotary plate 35 and a pin 41. Therefore, even if the shafts 33 and 19 are eccentric, the output of the shaft 33 is transmitted to the shaft 19 by the deflection of the coupling 40. In the case of manual operation with a handle, the handle is rotated, and the shaft 27 and 33 are rotated by the rotation of a rotary shaft 36 through the gear 26, the wheel 25 and the gear box 22. Thus the rotation angle of the lens barrel 15 can be finely adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a lens barrel rotation device for a surveying instrument that rotates a lens barrel rotationally driven by a motor so as to be finely adjustable by manual operation.

(Prior Art) Conventionally, as a lens barrel rotation device for rotating the lens barrel of a surveying instrument in the vertical and horizontal directions, those shown in FIGS. 5 and 6 are known.

In the one shown in FIG. 5, a rotation shaft 2 of a lens barrel 1 is rotatably held by a lens barrel support (not shown). The rotating shaft 2 and a motor 3 attached to the lens barrel support are connected via a reduction gear mechanism 4, and the reduction gear mechanism 4 has a handle 5 for manually rotating the lens barrel 2. It is connected. The rotational force of the motor 3 is transmitted through the reduction gear mechanism 4
When the motor 3 rotates, the handle 5 also rotates at the same time.

Further, in the device shown in FIG. 6, the rotation of the motor 3 is reduced in speed by a reduction gear mechanism 4 and transmitted to the rotating shaft 2 of the lens barrel 1, similar to the device shown in FIG. There is. The handle 6 for manual operation is slidably attached to the rotating shaft 6b of the gear 6a that meshes with the gear 4a of the rotating shaft 2. By sliding the handle 6 along the rotating shaft 6b, the handle 6 and the rotating shaft 6b are connected. and locking and unlocking.

(Problems to be Solved by the Invention) However, in the case of such a conventional lens barrel rotation device of a surveying instrument, there are the following problems.

In other words, in the case of the ones shown in FIGS. 5 and 6, if the rotating shaft 2 of the lens barrel 1 is tilted due to mounting errors, the bearing of the rotating shaft 2 when directly transmitting the rotational force of the reduction gear mechanism 4 This increases the load applied to the bearings, causing problems such as decreased accuracy and shortened life due to bearing wear. Therefore, it is possible to use a belt mechanism in place of the speed reduction mechanism 4, but if a belt mechanism is used, there is a problem in that the belt tension increase and torque fluctuation adversely affect the wear of the bearing of the rotating shaft 2.

Furthermore, in the one shown in FIG. 5, since the handle 6 rotates at the same time as the motor 3 rotates, there is a risk that the clothes of the distance measuring operator may become entangled in the handle 6.

There is a problem in that it is troublesome to move the gear toward and away from the gear 6a.

(Objective of the Invention) The present invention has been made with attention to the above-mentioned problem, and the present invention is directed to the load applied to the bearing when the torque of the reduction mechanism is transmitted to the rotation axis of the lens barrel, or the load applied to the rotation axis of the lens barrel. This reduces the increase in the load on the bearing when the output shaft is deviated or the bearing has looseness, and also prevents the manual operation handle from rotating when the motor is driven and prevents manual operation. It is an object of the present invention to disclose a lens barrel rotation device for a surveying instrument that allows easy switching operation of motor drive.

(Means for Solving the Problems) In order to solve the above problems, a lens barrel rotation device for a surveying instrument according to the present invention includes a motor for rotating a lens barrel and a handle for manually rotating the lens barrel. A cylindrical gear box with a worm foil formed on its circumferential surface is held rotatably and slightly movable in a direction perpendicular to the direction of rotation on the lens barrel support part, and the motor is attached to one end of the gear box. An input shaft driven by the gear box is rotatably held, an output shaft that rotates coaxially with the rotation axis of the lens barrel is rotatably held on the other side of the gear box, and the input shaft is held in the gear box. A deceleration mechanism is provided for decelerating the rotation of the lens barrel and transmitting the rotation to the output shaft, a thin flexible plate is provided on the rotation axis of the lens barrel, and a rotation transmission means connected to the flexible plate is provided on the output shaft. , the handle is provided with a worm gear, and the worm gear is engaged with the worm wheel.

(Function) According to the lens barrel rotation device for a surveying instrument according to the present invention, the worm gear attached to the handle is engaged with the worm wheel, so when the motor is rotated, the gear box is fixed and the output shaft is rotated. is transmitted to the output shaft via the reduction mechanism. The rotation transmission means of the output shaft is connected to the flexible plate of the rotating shaft of the lens barrel, and the flexible plate can be bent, and the part of the gear box held by the lens barrel support part is rotated in the direction perpendicular to the rotation direction. Even if the rotation axis of the lens barrel and the output shaft are at an angle of deviation, the rotation of the output shaft can be transmitted to the rotation axis of the lens barrel via the flexible plate. The lens barrel can be rotated. In the case of manual operation, the worm gear meshes with the worm wheel, so rotating the handle rotates the gear box. At this time, the reduction mechanism inside the gear box also rotates at the same time, so the rotation of the reduction mechanism is transmitted to the output shaft, which rotates, and the rotation axis of the lens barrel rotates via the rotation transmission means and the flexible plate. The lens barrel rotates.

(Example) Hereinafter, a lens barrel rotation device for a surveying instrument according to an example of the present invention will be described based on the drawings.

FIG. 2 shows a surveying instrument equipped with a lens barrel rotating device according to this embodiment. The surveying instrument 10 includes a surveying table 11 and a fixed part 12
The surveying instrument main body 13 includes a lens barrel support part 14 and a lens barrel 15 that are horizontally rotatable with respect to the fixed part 12. In this embodiment, the lens barrel support section 14 has a pair of struts 14a, 14b, and a rotating device for rotating the lens barrel 15 is provided on the pair of struts 14a, 14b. A handle 16 for manually rotating the lens barrel 15 is provided on the side wall of the lens barrel support portion 14 .

FIG. 1 shows the mechanism of the rotating device for the lens barrel 15. A bearing 18a is fixed to the frame 17a of one of the support columns 14a.
One end of the rotating shaft 19 is held. The other pillar part 1
A rotation mechanism is disposed inside the frame 17b of the frame 17b, and an opening 17c is opened at a portion of the frame 17b facing the lens barrel 15, and the other end of the rotating shaft 19 is held within this opening 17c. A bearing 18b is provided.

The bearing 18b is held by adjustment screws 20a and 20b provided on the peripheral wall of the opening 17c. Lens barrel 15
The rotating shaft 19 is held by these bearings 18a and 18b. A bearing 21 is disposed in the opening 17d of the frame 17b, and this bearing 21 is connected to the gear box 22.
It holds a cylindrical bearing part 23 protruding from one end.

The bearing 21 is held by a bearing fixing plate 24 screwed to the peripheral edge of the opening 17d. Gear box 22
is formed into a cylindrical shape, and worm foils 25 are formed on the outer peripheral surface of the gear box 22 in a line in the rotational direction of the gear box 22.

As shown in FIG.
6 are in mesh with each other, and the rotation of the worm gear 26 causes the gear box 22 to rotate. In addition, the rotation axis 18 of the handle 16
One end of a spring 16b supported by the frame 17b is in contact with the end of a, and presses the worm gear 26 against the worm wheel 25.

A speed reduction mechanism G is provided inside the gear box 22.

An input shaft 27 is rotatably held in the cylindrical bearing portion 23 of the gear box 22 . A pulley 28 is attached to one end of the input shaft 27.
is installed. This pulley 28 is the frame 17
A belt 31 is stretched around a pulley 30 that is rotated by a motor 29 that is attached to a motor 29 and is attached to a pulley 28 and an output shaft 29a of the motor 29.

The other end of the input shaft 27 protrudes into the gear box 22, and a gear 32 is attached to the other end of the input shaft 27. The other end of the gear box 22 is located on the lens barrel 15 side, and rotatably holds the output shaft 33. A gear 34 is attached to the end of the output shaft 33 inside the gear box 22. A rotating plate 35 is attached to the end of the output shaft 33 on the lens barrel 15 side for transmitting the rotation of the output shaft 33 to the rotating shaft 19 of the lens barrel 15. A rotary shaft 36 parallel to the rotation centers of the input shaft 27 and the output shaft 33 is rotatably provided on the side walls of both ends of the gear box 22, and a reduction gear meshing with the gears 32 and 34 is mounted on the rotary shaft 36. 37.38 are installed. In this embodiment, the speed reduction mechanism G is composed of gears 32, 34 and 37, 38.

Incidentally, the speed reduction mechanism G may be configured by a harmonic drive. When configured by a harmonic drive, the gear box 22 corresponds to a circular spline, the wave generator corresponds to the input shaft 27, and the flex spline corresponds to the output shaft 33.

A fixing ring 39 is attached to the end of the rotating shaft 19 of the lens barrel 15 on the gear box 22 side, and a thin plate-shaped plate as shown in FIG. A coupling 40 is mounted as a flexible plate. The coupling 40 has a substantially triangular shape and is flexible in the thickness direction. Bottle holes 40a are opened at three corners of the coupling 40, and the tip of a bottle 41 attached to the rotary plate 35 is fixed to the bottle holes 40a. The rotation transmission means is constituted by this bottle 41 and the rotary plate 35. 40b is a bottle hole fixed to the ring 39.

Next, the operation of the lens barrel rotation device of the surveying instrument according to this embodiment will be explained.

When rotating the lens barrel 15 by rotation of the motor 29,
The rotational force of the motor 21 is transmitted to the input shaft 27 via the pulley 301, the belt 31, and the pulley 27. motor 21
When the rotational force of the gear box 22 is transmitted to the input shaft 27,
The worm gear 2 of the handle 16 is attached to the worm wheel 25 of the
6 are in mesh with each other, the gear box 22 does not rotate, and the rotation of the input shaft 27 causes the output shaft 33 to rotate via the deceleration mechanism G. Since the worm gear 26 is engaged with the worm wheel 25, the handle 16 does not rotate.

Since the output shaft 33 and the rotating shaft 19 of the lens barrel 15 are engaged with each other through the coupling 40, the rotating plate 35, and the pin 41, even if the output shaft 33 and the rotating shaft 19 are eccentric or deviated, By bending the coupling 40, the rotation of the output shaft 33 is transmitted to the rotating shaft. Further, in this embodiment, the cylindrical bearing part 23 of the gear 10-box 22 is held by the bearing 21, and a slight play that is displaced in the direction perpendicular to the rotation direction is prevented between the bearing 21 and the cylindrical bearing part 23. If you let me have it,
The output shaft 3 is connected to the bearing 21 and the coupling 4o.
3 and the rotating shaft 19 can be eliminated.

In the case of manual operation using the handle 16, the handle 16
By rotating , the worm gear 26 rotates,
The gear box 22 is rotated via the worm wheel 25.

As the gear box 22 rotates, the rotating shaft 36 rotates around the input shaft 27 and the output shaft 33. The rotation of the rotating shaft 36 causes the gears 34 and 32 to rotate, and the output shaft 33 to rotate.

The rotation of the output shaft 33 is transmitted to the rotating shaft 19 via the rotating plate 35, the bin 41, and the coupling 40, and
rotates. Since the amount of rotation of the gear box 22 is smaller than the amount of rotation of the worm gear 26, the rotation angle of the lens barrel 15 can be finely adjusted.

According to the lens barrel rotation device of a surveying instrument according to this embodiment, even when the rotation axis 19 and the output shaft 33 are eccentric or declination,
Due to the deflection of the coupling 40 and the slight movement of the bearing 21 in the direction perpendicular to the rotation axis, the bearing load transmitted from the output shaft 33 to the rotation axis 19 of the lens barrel 15 can be alleviated. Moreover, since the worm wheel 25 and the worm gear 25 are engaged with each other, the handle 16 does not rotate when the lens barrel 15 is rotated by the motor 29, and the switching operation between manual operation and motor drive can be simplified.

Incidentally, the speed reduction mechanism G may be configured by a harmonic drive. When configured by a harmonic drive, the gear box 22 corresponds to a circular spline, the wave generator corresponds to the input shaft 27, and the flex spline corresponds to the output shaft 33.

Further, the speed reduction mechanism G has a speed reduction gear fixed to the frame 17b,
The rotating shaft 19 of the lens barrel 15 and the speed reducer may be connected by a coupling (for example, an Oldham coupling) that takes eccentricity and declination.

(Effects of the Invention) As explained above, in the lens barrel rotation device for a surveying instrument according to the present invention, since the output shaft and the rotation axis of the lens barrel are connected via a flexible plate, the lens barrel is rotated by manual motor power. It is possible to reduce the load on the bearing of the rotating shaft of the lens barrel, and even when the rotating shaft of the lens barrel and the output shaft are at an angle of deviation, the output shaft is transmitted to the rotating shaft of the lens barrel by the flexure of the flexible plate. Since the bearing load on the lens barrel can be alleviated, deterioration in accuracy due to wear of the lens barrel bearing can be prevented. Furthermore, since the worm wheel of the gear box and the worm gear of the handle are engaged, the handle does not rotate when the lens barrel is rotated by the motor, making it possible to easily switch between manual operation and motor drive.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the mechanism of a lens barrel rotating device according to an embodiment of the present invention. FIG. 2 is a front view of a surveying instrument to which this embodiment is applied. 3 is a plan view of the coupling of FIG. 1; FIG. FIG. 4 is an explanatory diagram showing the relationship between the worm gear and worm wheel in FIG. 1. FIG. 5 is an explanatory diagram showing a conventional lens barrel rotation mechanism in which a handle rotates when a motor is driven. FIG. 6 is an explanatory diagram of a conventional lens barrel rotation mechanism that prevents rotation of the handle when the motor is driven. DESCRIPTION OF SYMBOLS 10... Survey instrument, 13... Survey instrument main body 14... Lens barrel support part, 15... Lens barrel 16... Handle, 18a
, 18b...bearing 19...rotating shaft 21
... Bearing 22 ... Gear box, 25 ... Worm wheel 26 ... Worm gear, 27 ... Input shaft 2
9... Motor 32.34... Gear 35... Rotating plate, 37.38... Reduction gear 40... Coupling, 41... Bin G... Reduction mechanism

Claims (1)

[Claims] (1) A cylindrical gear box with a worm foil formed on the circumferential surface is rotatably attached to a lens barrel support part equipped with a motor that rotates the lens barrel and a handle that manually rotates the lens barrel. An input shaft driven by the motor is rotatably held on one end side of the gear box, and a lens barrel is held on the other side of the gear box. An output shaft that rotates coaxially with the rotation axis of the lens barrel is rotatably held, and a deceleration mechanism that decelerates the rotation of the input shaft and transmits the rotation to the output shaft is provided in the gear box, and the rotation axis of the lens barrel is A thin flexible plate is provided, and a rotation transmission means connected to the flexible plate is provided on the output shaft,
A lens barrel rotation device for a surveying instrument, characterized in that the handle is provided with a worm gear, and the worm gear is engaged with the worm wheel.