JP2002310654A - Laser-positioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent delay in positioning operation due to a backlash existing in a reduction gear means, when turning a turn table 2 supporting a laser optical system 1 by a motor 3 via the reduction gear means for positioning a laser beam 35. SOLUTION: When the turning direction of the turn table 2 is changed, the motor 3 is turned by a previously stored extra mount equating to the backlash of the gear means, thereby eliminating delays.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser positioning apparatus using a laser which is used for a blackout operation at a construction site or the like.

[0002]

2. Description of the Related Art In a blackout operation using a laser at a construction site, a position is manually adjusted to a target position.

[0003]

The laser marking operation at a building site usually requires one laser positioning device.
At a point separated by 0 m, a positioning accuracy of about ± 1 mm is required. Therefore, when the turntable is driven by a motor by remote control, the gear ratio of the gear reduction unit becomes very large, and the backlash amount of the gear reduction unit becomes large. In particular, when the rotation direction changes, the drive means such as a motor must idle until the backlash is absorbed, which causes a problem that response by remote control is deteriorated and work efficiency is reduced.

[0004] It is an object of the present invention to eliminate the deterioration of the responsiveness of the positioning operation and to improve the working efficiency.

[0005]

The above-mentioned object is achieved by driving the driving means extra by an amount corresponding to the backlash amount of the gear reduction means stored in advance during the first operation in which the rotation direction is changed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing one embodiment. A laser positioning device that projects a laser in a vertical direction and projects a lower reference light from above a central axis; a turntable 2 that can manually rotate the laser optical system 1 when a driving unit is stopped; The motor 3 constituting the driving means of the present invention for rotating the laser optical system 1, the gear group 4 constituting the gear reducing means of the present invention for reducing the rotation of the motor 3 and transmitting the rotation to the turntable 2, the rotation direction and rotation of the motor 3 Control means 5 for controlling the number and rotation angle, battery 6 as a power source of the laser positioning device, remote control means 7 for controlling the motor 3 from a remote place (hereinafter referred to as a remote control), and receiving control signals from the remote control 7 It comprises an antenna 8, a turntable 2, a mount 9 for storing the motor 3, and the like. The remote operation may be performed by any method, such as by electromagnetic waves (including radio waves and infrared rays) and by ultrasonic waves. In the case of remote control using infrared rays, the antenna 8 may be replaced with an infrared receiving module. In the case of ultrasonic waves, an ultrasonic microphone may be used instead of the antenna 8.

FIG. 2 shows a block circuit diagram of the control means 5. The control unit 5 demodulates a signal from the antenna 8 that receives a signal from the remote controller 7, and outputs a demodulated signal, reads an output signal of the reception circuit 21, and reads a rotation direction, a rotation speed, and a rotation speed of the motor 3. A microcomputer 22 for controlling the rotation angle, a motor driving means 23 for driving the motor 3 based on an output signal from the microcomputer 22, and an EEP in which the gear backlash amount of the gear group 4 of the gear reduction means is stored in advance.
It is composed of a ROM 24. Note that the EEPROM 24 may be one built in the microcomputer 22. Also, EEPR
When the OM 24 is not mounted, the data may be written in a ROM or a flash ROM built in or external to the microcomputer 22.

In the positioning operation using the laser positioning device, as shown in FIG. 3, first, a lower reference beam 32 projected below the center axis of the laser optical system 1 of the laser positioning device 31 causes the laser positioning device 31 to move. The center of the laser optical system 1 is aligned with the vertical reference point 33. Next, the operator roughly or manually adjusts the position of the laser beam 35 to the vicinity of the target reference line 34 using the remote controller 7. After moving the laser light 35 near the reference line 34, the remote controller 7 finely adjusts the laser light 35 on the reference line 34 to perform final alignment. For this reason, as shown in FIG. 4, the remote controller 7 can select a rotation direction and a rotation speed by using buttons. The high-speed rotation mode is used for rough positioning, and the motor 3 can be continuously rotated to rotate the laser optical system 1 large and quickly.
In the minute rotation mode, the rotation angle of the laser optical system 1 when the button is pressed once is controlled to be small, and the laser beam 35 is moved to the final reference line 34 in this mode. At this time, if the worker moves by repeating the micro-rotation continuously, the target reference line 34 may be exceeded. At this time, it is necessary to reverse the rotation direction of the laser optical system 1. At this time, the laser optical system 1 does not rotate until the amount of backlash is absorbed by a normal minute rotation due to the backlash of the gear group 4 of the gear reduction means. In addition, responsiveness to a remote operation is deteriorated, and work efficiency is reduced. Therefore, it is necessary to correct the backlash amount by some means.

FIG. 5 shows an operation flow of the microcomputer 22 at the time of the positioning operation using the remote controller 7 by the laser positioning device 31 of the present invention. Normally, the microcomputer 22 waits for a signal from the remote controller 7 (step 5).
1). When a signal is received from the remote controller 7, the command is discriminated, and in the high-speed rotation mode (step 52), a drive signal is continuously output to the motor 3 (step 53). When a step motor is used as the motor 3, this drive signal becomes a pulse for continuously driving the step motor,
When a normal DC motor is used, the drive signal is PWM
The signal becomes a signal for continuously rotating the motor 3 at a constant speed. Upon receiving the fine feed signal and if the feed direction is the same as the previous rotation direction (step 54), a predetermined amount of fine feed drive signal is output to the motor driving means 23 (step 55). If the signal changes to the opposite direction, E
The backlash amount is read from the EPROM 24 (step 56), and a drive signal corresponding to the amount is output to the motor drive means 23 (step 57). When a step motor is used as the motor 3, this drive signal is a signal for rotating the step motor one step at a time, and the amount corresponding to the backlash amount is stored as the step amount of the step motor. When a normal DC motor is used, the drive signal is a PWM signal or the like, and is stored as the time for rotating the motor 3 and the speed of rotation. When there is no received signal, the motor 3 is stopped (step 58).
stand by.

[0010]

According to the present invention, at the time of the first operation in which the rotation direction is changed, the motor is additionally driven by an amount equivalent to the backlash of the gear reduction means stored in advance. As a result, it is possible to prevent a deterioration in responsiveness in the positioning operation and prevent a reduction in work efficiency.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a laser positioning device of the present invention.

FIG. 2 is a block diagram showing an embodiment of a control unit for driving the turntable constituting the present invention.

FIG. 3 is a perspective view showing a positioning work operation state by the laser positioning device.

FIG. 4 is a front view showing an operation surface of a remote controller constituting the present invention.

FIG. 5 is a flowchart for explaining the operation of the present invention.

[Explanation of symbols]

1 is a laser optical system, 2 is a rotary table, 3 is a motor, 4 is a gear group, 5 is control means, 7 is remote control means, and 9 is a gantry.

Claims (4)

[Claims] 1. A laser positioning apparatus for performing positioning by projecting a laser vertically, comprising: a rotary table provided with a laser optical system rotatably in a frame in a horizontal direction; and gear reduction means for reducing the rotary table by a gear. A driving means such as a motor for driving the turntable via the speed reduction means, an operation means capable of operating the rotation direction, rotation speed and rotation angle of the turntable, and a back of the gear reduction means when the rotation direction of the turntable changes. A laser positioning device comprising a control means for operating a driving means extra by an amount corresponding to a rush amount. 2. The apparatus according to claim 1, wherein said control means has a storage means for storing the backlash amount in advance.
The laser positioning device according to 1. 3. The laser positioning apparatus according to claim 1, wherein said operation means can be remotely operated by using radio waves, infrared rays, ultrasonic waves or the like. 4. A laser positioning apparatus according to claim 1, wherein said driving means is a step motor.