JPH0810773Y2 - Coarse / fine movement device of rotary shaft in surveying instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a coarse / fine adjustment device for a rotation axis, for example, a horizontal axis or a vertical axis, in a surveying instrument.

[Prior Art and its Problems] For example, a horizontal axis that supports a telescope included in a surveying instrument and a vertical axis that supports a surveying instrument main body can be minutely rotated by a fine movement feed mechanism. However, in order to perform fine feed, fix the rotary shaft once with the fixing screw,
There was the annoyance of having to operate the fine feed screw.

Although a motor that can be finely moved has also been proposed, the rotation of the motor is a constant speed rotation, and a push button switch is used as an operation switch for driving the motor. For this reason, there is a problem that the switch must be kept pressed to increase the amount of rotation of the rotary shaft. Further, when the push button switch is used, it is necessary to continue pushing or step pushing for minute rotation, and there is also a problem that the main body is easy to move and difficult to operate.

A joystick-type switch has also been proposed, but there is a problem in operability because it may move both horizontal and vertical axes.

Generally, the rotation of a surveying instrument has conventionally used a rotary type operation knob, and the rotary type operation knob is adjusted by the human hand while rotating the rotary type operation knob in opposite directions. It is preferable to be able to operate according to the amount of motion.

In order to meet such a demand, an object of the present invention is to provide a surveying instrument capable of operating from a fine movement to a coarse and fine movement by rotating the rotary operation knob in a normal and anticlockwise manner and feeling the same as a conventional coarse and fine movement device. It is to provide a coarse and fine movement device for a rotating shaft.

[Means for Solving the Problems] The coarse / fine adjustment device for the rotary shaft in the surveying instrument according to the present invention is
A gear that is integrally formed with a rotary shaft of a surveying instrument, and a coarse / fine adjustment device that rotates the rotary shaft by transmitting an output of a drive motor to the gear, wherein rotation of the rotary shaft includes a power source and a rotary variable resistor. The control amplifier and the control amplifier set the intermediate position of the variable resistance to zero potential, and the voltage is controlled by the position of the slider sliding on the variable resistance, and the voltage is supplied from the control amplifier to the drive motor. A feature is that coarse and fine movement rotation is performed according to the amount of rotation of the rotary operation knob.

Further, it is preferable to provide a reduction gear and a clutch mechanism which can be engaged and disengaged with the output shaft and the gear between the output shaft of the drive motor and the gear formed integrally with the rotation shaft of the surveying instrument.

[Operation] According to the present invention, it is a coarse and fine movement device of a rotary shaft that transmits the output of a drive motor to a gear and rotates it. The rotation of the rotary shaft is controlled by a power source, a rotary variable resistor, and a control amplifier. The voltage is controlled by the position of the slider that slides the variable resistor with zero as the zero potential, and the current is supplied from the control amplifier to the drive motor at this voltage, depending on the rotation amount of the rotary operation knob. Since coarse / fine movement rotation is performed, when the rotary shaft is finely fed, the rotary operation knob may be rotated by a small amount. On the other hand, when the rotary shaft is coarsely fed, the rotary operation knob may be rotated by a considerable amount. Of course, the fine movement to the coarse movement can be adjusted only by the rotation amount of the rotary operation knob without using the switching operation.

As an application of this, by installing a reduction gear and a clutch mechanism that can be engaged and disengaged with the output shaft and the gear between the output shaft of the drive motor and the gear formed integrally with the rotation shaft of the surveying instrument, it is possible to observe the telescope in a normal or counter direction. It can be easily performed by manual operation.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
It should be noted that the members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

FIGS. 1A to 1E show a first embodiment of the present invention, and in this embodiment, the rotation of a horizontal axis of a transit as a surveying instrument will be described as an example.

The coarse and fine movement device of this example has a rotary operation knob portion,
The motor control drive circuit, the drive motor, and the power supply are the main components.

As shown in FIG. 1A, a rotary type operation knob portion 1 is formed on a housing 2 that pivotally supports a transit telescope. As shown in FIG. 1B, the rotary operation knob portion 1 is composed of a fixed disc body 3 and a rotating body 4. The fixed disc body 3 and the rotating body 4 have a motor control drive circuit shown in FIG. 1D. Variable resistor R forming part of 10 and slider
13 are formed. That is, the rotary operation knob portion 1 is composed of a disk body 3 screwed and fixed to a housing body 2 and a rotating body 4 having a bottomed hollow cylindrical body having an opening 4a formed on one surface thereof. The opening 4a side of the body 4 is configured to be rotatable with respect to the disk body 3 via a bearing portion 5 made of a bearing or the like. An insulator (not shown) is provided on the bottom surface 4b of the rotating body 4.
The slider 13 is provided via a contact point 13a, 13b on the side of the opening 4a of the rotating body 4 as a sliding contact. Is attached to.

The outer surface of the disk body 3 (that is, the surface opposite to the housing 2) is a flat surface portion 3a, and the variable resistance R is formed on the flat surface portion 3a. This variable resistor R is, as shown in FIG. 1C,
Along the movement locus of the slider 13, one inner circular conductive pattern 14 and a circular conductive pattern 15 outside the conductive pattern 14 are used. 15 is formed by vapor deposition or the like. Both ends of the conductive pattern 15 are connected to terminals R ₁ , R ₃ by lead wires.
And the conductive pattern 14 is connected to the terminal R ₂ .

FIG. 1D shows the drive control circuit 10 in this example, and as shown in FIG. 1D, the conductive patterns 14 and 15 are fixed contacts, and the terminals of the conductive pattern 15 are shown.
R ₁ and R ₃ are connected to a power source 11 provided inside the housing 2 by a lead wire. Further, the terminal R ₂ of the conductive pattern 14 in the inner circular band is connected to the control amplifier (op-amp) 16 provided inside the casing 2 by a lead wire. The control amplifier 16 has a rotation amount (θ) of the knob portion 1,
That is, the output is set to increase in proportion to the increase in the voltage divided by the variable resistor R, and
The output voltage controlled by the power supply 11, the variable resistor R, and the slider 13 is converted into a current. In addition, the slider 13 and the control amplifier 16
, And diodes D ₁ and D ₂ are connected in parallel in opposite directions. By doing so, the current value (I) from the power supply 11 supplied to the drive motor M is configured to be determined according to the rotation amount (θ) of the rotary operation knob portion 1.

The contact 13a of the slider 13 is in sliding contact with the inner strip-shaped circular conductive pattern 14, and the contact 13b is in sliding contact with the outer strip-shaped conductive pattern 15.

On the other hand, as shown in FIG. 1E, a spur gear 6 is mounted on the horizontal shaft 5 supporting the telescope, and a worm 8 fixed to an output shaft 7 of the motor M meshes with the spur gear 6. There is.

The drive motor M is a DC reversible motor and has a control amplifier.
It is controlled by the output current I from 16.

Next, the operation of the embodiment having the above configuration will be described.

The drive motor M rotates with an output according to the output current I from the control amplifier 16, but since the output current I is determined by the resistance value of the variable resistor R, by changing the resistance value by rotating the knob portion 1, The rotation speed of the drive motor M can be controlled. That is, the slider 13 of the rotary operation knob portion 1 is normally positioned substantially in the middle of the conductive pattern 15 as indicated by the reference numeral 13 'in FIG. 1C. Because when the slider 13 is located in this position, even if ON the power supply (not shown), the resistance value between the between the R ₁ to R ₂ and R ₂ to R ₃ are the same, R The potential of ₂ becomes almost 0, the potential difference does not occur and the motor does not operate. When the rotating the rotary operation knob 1 on one side, the R ₁ to R the resistance value between the R ₂ to R ₃ between ₂ are different, a potential difference is generated, a voltage is applied to the terminal R ₂ The Rukoto. This means that the more the rotary operation knob portion 1 is rotated to one side, the more difference in resistance value occurs, and the more voltage is applied to the terminal R ₂ . Then, as shown by the arrow in FIG. 1D, in the case of the forward direction from the terminal R _2, the motor M converted into the current by the control amplifier 16 through the diode D ₁ is rotated in the forward direction. On the contrary, when the rotary operation knob portion 1 is rotated, as shown by the chain line arrow in FIG. 1D, the motor M is driven through the diode D _2.
Will rotate in the opposite direction. In FIG. 1D, solid arrows indicate forward rotation, and dotted arrows indicate reverse rotation.

That is, the voltage V output according to the change in the resistance value of the variable resistor R is set so as to increase according to the rotation amount (θ) of the rotary operation knob portion 1, and is supplied to the drive motor M. Since the current value (I) depends on the rotation amount (θ) of the rotary operation knob portion 1, the output of the drive motor M according to the rotation amount of the rotary operation knob portion 1, that is, the rotation speed is obtained.

Therefore, when it is desired to perform a coarse movement operation of the telescope about the horizontal shaft 5, the rotary operation knob portion 1 is largely rotated to rotate the horizontal shaft 5 at a high rotation speed of the drive motor M. On the other hand, when a fine movement operation is desired, the rotary operation knob portion 1 is slightly rotated to drive the drive motor M.
The horizontal shaft 5 is rotated at a low rotation speed. Further, the drive motor M is a reversible motor, and is configured so as to be able to rotate in the positive and negative directions according to the rotating direction of the rotary operation knob portion 1.

The rotary operation knob portion 1 is resiliently engaged with the fixed side disk body 3 by a spring or the like (not shown). When the rotary operation knob portion 1 is released from the rotating state, the rotary operation knob portion 1 is short-circuited with the power supply 11. It returns to the state position, that is, the intermediate position (the position indicated by reference numeral 13 ') of the conductive pattern 15 in FIG. 1C.

In this embodiment, a variable resistor R is provided outside the housing 2, and the motor drive control mechanism provided inside the housing is connected only via a lead wire, and the rotary operation knob 1 is supported. Waterproofing inside and outside the enclosure of the part becomes easy and reliable.

FIG. 2 shows a second embodiment of the present invention. In the first embodiment, the output of the motor M is directly transmitted to the horizontal shaft. However, in this embodiment, the reduction gear and the clutch mechanism are used. Is used so that the rotation of the rotary shaft can be made slower and can be engaged with and disengaged from the output shaft of the motor M. In this example, the same members and the like as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

A gear 21 is formed on the tip side of the output shaft 7 of the drive motor M, and the gear 21 and the reduction gear 22 mesh with each other. Reduction gear 22
Is formed of an inner tooth 22a that meshes with the gear 21 of the motor M, an outer tooth 22b that meshes with the spur gear 6 above the inner tooth 22a, and a support shaft 23 that is integral with these teeth 22a, 22b. Has been done. The support shaft 23 is supported by bearings 24, 24, and the bearings 24, 24 are held by a frame body 25. The frame 25 is movably supported by the housing 2 by a support member (not shown). On the other hand, the frame body 25 can be movably operated from the outside of the housing body 2 by the connecting rod 26.

With this configuration, the spur gear 6 is normally rotated by the output of the drive motor M by the rotation of the rotary operation knob portion 1, but when the output of the motor M is not used, for example, to eliminate a mechanical error. Since it is necessary to observe whether it is normal or not, the rotation with the motor coupling is slow, so when manual operation is desired or when the drive motor M cannot be used, the connecting rod 26 is moved as shown by the arrow in FIG. Then, by disengaging the output shaft 7 of the drive motor M, the manual operation can be performed as in the conventional case. In addition, the connection rod 26
Is configured so as to be constantly meshed with the gear 21 of the output shaft 7 of the drive motor M and the spur gear 6 by an elastic means (not shown) or the like. When the drive motor M is not used, The reduction gear is moved against this, and the gear 21 of the output shaft 7 and the spur gear 6 are prevented from meshing with each other by a well-known locking means.

In the above embodiment, the coarse / fine movement operation of the horizontal axis is explained, but the present invention is also applied to the coarse / fine movement operation of the vertical axis supporting the surveying instrument body and the rotation operation of the slide operation axis of the focusing lens. be able to.

Further, as another example, it is possible to achieve the purpose of focusing by directly combining with a focusing knob without providing a clutch mechanism.

[Advantages of the Invention] Since the present invention is configured as described above, when the rotary shaft is finely fed, the rotary operation knob is rotated by a small amount, while when the rotary shaft is coarsely fed, the rotary type is used. By rotating the operation knob by a considerable amount, fine movement to coarse movement can be adjusted by only rotating the rotary operation knob without performing any switching operation, so that the operability is dramatically improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A to 1E show a first embodiment of the present invention.
FIG. 1A is an external view of a surveying instrument equipped with a coarse / fine adjustment device, FIG. 1B is a sectional view of a main portion of a knob portion, FIG. 1C is a pattern diagram, FIG. 1D is a circuit diagram, and FIG. 1E is an output shaft of a motor. And FIG. 2 is an explanatory view showing an engagement state between the shaft and a horizontal shaft, and FIG. 2 is a sectional view of a main part showing a second embodiment of the present invention. 1 ... Rotary operation knob (knob), 2 ... case, 3 ... disk, 4 ... rotator, 5 ... rotation axis (horizontal axis), 6 ... gear (spur gear), 7 ...... Output shaft, 8 ... Worm, 10 ... Control circuit, 11 ... Power supply, 13 ... Slider,
14,15 ... Variable resistance (conductive pattern), 16 ... Control amplifier, 21 ... Gear, 22 ... Reduction gear, 22a ... Internal teeth, 22b ...
… External teeth, 23 …… Support shaft, 24 …… Bearing, 25 …… Frame, 26…
… Connecting rod, D ₁ , D ₂ …… Diode, M …… Drive motor,
R: Variable resistance, S: Coarse / fine adjustment device.

Claims (2)

[Scope of utility model registration request] 1. A gear that is integrally formed with a rotary shaft of a surveying instrument, and a coarse / fine adjustment device that transmits the output of a drive motor to the gear to rotate the rotary shaft. With the power source, the rotary variable resistor, and the control amplifier, the intermediate position of the variable resistor is set to zero potential, and the voltage is controlled by the position of the slider that slides on the variable resistor. With this voltage, a current is sent from the control amplifier to the drive motor. A coarse / fine adjustment device for a rotary shaft in a surveying instrument, characterized in that the coarse / fine adjustment rotation is performed in accordance with the amount of rotation of the rotary operation knob. 2. A reduction gear and a clutch mechanism that can be engaged and disengaged with the output shaft and the gear are provided between the output shaft of the drive motor and a gear integrally formed with a rotation shaft of the surveying instrument. The coarse / fine adjustment device for a rotating shaft in a surveying instrument according to claim 1.