MACHINE TOOL AND BRAKE CHECKING METHOD

Title:

MACHINE TOOL AND BRAKE CHECKING METHOD

Document Type and Number:

WIPO Patent Application WO/2016/042874

Kind Code:

A1

Abstract:

In a mechanism for stopping rotation of a vertical shaft with at least two brakes, the present invention provides a machine tool that more reliably detects brake malfunctions, the machine tool comprising a ball screw extending in the vertical direction, a drive motor that rotationally drives the ball screw, a moveable portion that moves vertically along the ball screw in accordance with the rotation of the ball screw engendered by the drive motor, at least two brakes for preventing lowering of the moveable portion when the electrical power supply to the drive motor has stopped, a brake control unit that releases at least one of the at least two brakes when the electrical power supply to the drive motor has stopped, and a detection unit that detects the presence or absence of lowering of the moveable portion or a lowered distance of the moveable portion caused by the release of the at least one brake so as to detect a defect of the unreleased brake of the at least two brakes.

More Like This:

WO/2016/209818

MULTI-AXIS MACHINE TOOL AND METHODS OF CONTROLLING THE SAME

Inventors:

OKAMOTO YOICHI (JP)
GOMI EIICHIRO (JP)

Application Number:

PCT/JP2015/067859

Publication Date:

March 24, 2016

Filing Date:

June 22, 2015

Export Citation:

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Assignee:

DMG MORI CO LTD (JP)

International Classes:

B23Q5/54; B23Q5/40; B23Q15/00; B23Q17/00; F16D66/00

Foreign References:

JP2003266278A	2003-09-24
JPS53105776A	1978-09-14
JPH035100A	1991-01-10
JPH0739190A	1995-02-07
US3931727A	1976-01-13

Other References: