Title:
PORTABLE MACHINING TOOL
Document Type and Number:
WIPO Patent Application WO/2021/039186
Kind Code:
A1
Abstract:
[Problem] To provide a portable machining tool with which it is possible to detect floating of an electromagnet more appropriately even when the thickness of a workpiece to be magnetically attracted by the electromagnet is different. [Solution] A portable machining tool 1 is provided with: an electromagnet 12 for fixing a machining tool body 10 with respect to a workpiece; a magnetic sensor 42 arranged around the electromagnet; an electric motor 20 for rotationally driving an annular cutter 16; and a control unit 48 for controlling the electromagnet 12 and the electric motor 20. The control unit 48 sets a normal operation range on the basis of an output value from the magnetic sensor 42 during operation of the electromagnet 12 and before driving the electric motor 20 to start a machining task with the annular cutter 16. Furthermore, when the output value from the magnetic sensor 42 after the start of the machining task is out of the normal operation range, the control unit 48 determines that the electromagnet 12 has floated from the workpiece and stops driving of the electric motor 20.
Inventors:
IDOTA KIYOSHI (JP)
Application Number:
PCT/JP2020/027865
Publication Date:
March 04, 2021
Filing Date:
July 17, 2020
Export Citation:
Assignee:
NITTO KOHKI CO (JP)
International Classes:
B23B45/02; B23B47/00; B23Q9/02; B23Q11/00; B23Q17/00
Foreign References:
| JPS57102709A | 1982-06-25 | |||
| US20170217010A1 | 2017-08-03 | |||
| JPH03126512U | 1991-12-19 | |||
| JP2014231129A | 2014-12-11 |
Attorney, Agent or Firm:
ITOH, Shigeru et al. (JP)
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