Coordinate measuring machine and coordinate measuring program

Patent metadata

Field	Value
Publication number	US-11274945-B2
Application number	US-202016885922-A
Country	US
Kind code	B2
Filing date	May 28, 2020
Priority date	Jun 5, 2019
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A coordinate measuring machine including a surface plate; a probe moving body; an INC pattern and ABS pattern along a moving direction of the probe moving body; an INC detector that outputs a plurality of waveform signals in accordance with the moving amount based on the INC pattern; an ABS detector that outputs an absolute position signal of the probe moving body based on the ABS pattern in response to a request signal; and a control device that has a INC counting portion that counts the waveform signals outputted by the INC detector; a position information obtaining portion that reads a counted value at a timing when a work is detected by a probe; and a presetting portion that emits the request signal to the ABS detector to obtain the absolute position signal, and presets the counting portion to this absolute position signal.

First claim

The invention claimed is:

1. A coordinate measuring machine comprising:
a work supporting body that supports a work;
a probe moving body that moves a probe relative to the work; and
a control device that controls driving of the probe moving body to obtain a position information of the probe moving body at a timing when the probe detects the work; the coordinate measuring machine that measures a work shape based on the position information further comprises:
an incremental pattern aligned along a moving direction of the probe moving body; an absolute pattern aligned along the moving direction of the probe moving body; an incremental detector that detects the incremental pattern to output a plurality of waveform signals proportional to a moving amount of the probe moving body; and an absolute detector that detects the absolute pattern at a timing when a request signal from the control device is received to output an absolute position signal of the probe moving body,

wherein
the control device comprises:
an incremental counting portion that counts the waveform signals from the incremental detector;
a position information obtaining portion that reads a count value of the incremental counting portion at the timing when the probe detects the work; and
a presetting portion that sends the request signal to the absolute detector for presetting the incremental counting portion to obtain the absolute position signal from the absolute detector, and preset the incremental counting portion to the absolute position signal.

2. The coordinate measuring machine according to claim 1 , wherein
the incremental pattern and the absolute pattern are formed on one scale.

3. The coordinate measuring machine according to claim 1 , wherein
the control device comprises a servo-locking portion that controls servo locking of a servo motor, which is a motor for driving the probe moving body, and
during presetting performed by the presetting portion, the servo-locking portion is configured to servo lock the servo motor to stop rotation.

4. The coordinate measuring machine according to claim 2 , wherein
the control device comprises a servo-locking portion that controls servo locking of a servo motor, which is a motor for driving the probe moving body, and
during presetting performed by the presetting portion, the servo-locking portion is configured to servo lock the servo motor to stop rotation.

5. A non-transitory computer-readable storage medium storing a coordinate measuring program to measure a work shape by obtaining a position information of a probe moving body at a timing when a probe detects a work,
the coordinate measuring program for causing a computer to execute processing comprising:
incremental counting a plurality of waveform signals proportional to the moving amount of the probe moving body from an incremental detector;
reading a count value in the incremental counting at the timing when the probe detects the work;
position information obtaining of the probe moving body based on the count value;
emitting a request signal to an absolute detector for presetting the count value at the incremental counting;
obtaining an absolute position signal of the probe moving body from the absolute detector; and
presetting the count value of the incremental counting to the absolute position signal.

Assignees

• Mitutoyo Corp

Inventors

• Terashita Yo
• Kunihiro Seiko
• Kamitani Hiroshi
• Fukuda Mitsuru

Classifications

• G01D5/34792

  with only digital scales or both digital and incremental scales · CPC title

• G01D5/34738 Primary

  Axles; Driving or coupling means · CPC title

• G01B21/047 Primary

  Accessories, e.g. for positioning, for tool-setting, for measuring probes · CPC title

• G01B5/008 Primary

  using coordinate measuring machines · CPC title

• G01B5/20

  for measuring contours or curvatures · CPC title