Geometrical instruments – Gauge – With calibration device or gauge for nuclear reactor element
Patent
1991-02-08
1993-02-23
Cuchlinski, Jr., William A.
Geometrical instruments
Gauge
With calibration device or gauge for nuclear reactor element
33503, 33567, 33703, 73 1J, 220335, G01B 2104
Patent
active
051878747
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention refers to a coordinate measuring machine, especially to a coordinate measuring machine equipped with protected origin point blocks thereon.
BACKGROUND ART
Various kinds of coordinate measuring machines are known for precisely measuring a configuration of and dimensions of an object to be measured. Some of them consists of a base for supporting an object to be measured thereon, origin point blocks, each of which has a master ball serving as the origin of measurement and being disposed at a certain point on the base, a first moving device having a gantry shape and moving essentially horizontally on the base, a second moving device movable nearly horizontally on the first moving device, and a third moving device which vertically moves through the second moving device and is provided with a detector.
When detecting the dimensions and configuration of the object by the coordinate measuring machine, the detector is contacted with the master ball to set the origin for measurement, then touching the object by moving the first, the second, and the third moving devices respectively so as to measure the dimensions and configuration of the object.
It is known that such a conventional coordinate measuring machine is ordinarily operated in a special environmentally controlled room which is kept at an average temperature and humidity to enhance measuring accuracy. However, usually there are several production processes or steps required to produce commodities in a factory, so that if each process step requires the measurement of the dimension and configuration of the commodities, several conventional coordinate measuring devices will be needed in the factory. This causes some problems.
The temperature and humidity in a factory is not always constant and when processing the work by a machine tool, small grains of waste matter are raised, become suspended in the air and then become attached to the master ball.
In this case, because the coordinate measuring machine is expected to precisely measure the object, the dust particles on the master ball negatively influences the detector causing the detector to thereby miss the origin of measurement. Incidentally, a precise measurement of the object cannot be conducted.
An object of the present invention is to protect the origin point block from the dust suspended in the air and to prevent the dust from collecting on the master ball of the origin point block. Accordingly, the origin of measurement can be set precisely and the accuracy of measurement by the coordinate measuring machine is improved by the present invention.
DISCLOSURE OF INVENTION
A coordinate measuring machine shown in this invention includes a base plate for supporting an object to be measured thereon, origin point blocks provided on the base plate to serve as an origin of measurement, a moving system having a detector which moves to the origin point blocks to set the origin of measurement and then moves in the horizontal and vertical directions to contact with the object to be measured for detecting the dimensions and configuration of the object, and cover devices for covering and occasionally exposing each of the origin point blocks.
The cover device preferably consists of a box for the origin point block and an openable and closeable cover having a shape corresponding to the box.
Otherwise, the cover device may include a box having a room inside for enclosing the origin point block, a cover having a shape corresponding to the box so as to open and close, and a drive device which is connected to the box and the cover for effecting an opening and closing motion of the cover.
In construction of the drive device for an opening and closing motion of the cover, it preferably has a telescopic fluid cylinder one end of which is joined with the box, the other end of which is joined with the cover.
To perform a measuring operation of the coordinate measuring machine in the present invention, the origin of measurement is first set by the origin point block. The position of the object
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patent: 4788999 (1988-12-01), Dalpane
patent: 4901256 (1990-02-01), McMurtry et al.
Matsumoto Masakazu
Takahashi Keizo
Cuchlinski Jr. William A.
Mitutoyo Corporation
Wirthlin Alvin
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