Geometrical instruments – Gauge – With support for gauged article
Patent
1989-06-16
1992-02-11
Cuchlinski, Jr., William A.
Geometrical instruments
Gauge
With support for gauged article
33550, 33551, 335551, 33569, 33573, 33568, G01B 520
Patent
active
050865692
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for checking features of workpieces with rotational symmetry defining a geometrical axis, comprising support and protection means with a base, rest devices fixed to the base for supporting the workpiece with the geometrical axis horizontally arranged, and a support structure coupled to the base and rotating about a horizontal axis; control means; and sensing means coupled to the support structure and movable with it from a rest position, to allow the loading of the workpiece to be checked on the rest devices, to a working position for bringing the sensing means in cooperation with the workpiece.
BACKGROUND ART
An apparatus comprising all the above features is described in U.S. Pat. No. US-A-3905116 to Roberts. In particular, said patent relates to a crankshaft measuring apparatus including a main frame which carries two preliminary alignment V blocks, a headstock with a spindle nose and a tailstock with a dead centre, for supporting the crankshaft to be checked, and a carriage. The carriage comprises a part supporting a probe, said part being pivotable about an axis parallel to the axis defined by nose and dead centre.
In this known apparatus the axis of rotation of the structure carrying the sensing means, that is the probe, is arranged substantially beside and behind with respect to the position of the workpiece geometrical axis defined by the rest devices - that consist in the spindle nose and the dead centre -, by considering as front and rear parts of the apparatus those located at the operator's side and the opposite side, respectively. Consequently, the accessibility of the apparatus during the workpiece loading and unloading phases is not satisfactory, the overall dimensions in a transversal and/or vertical direction are considerable and there are also considerable risks of the workpiece possibly colliding against and damaging the sensing means.
DISCLOSURE OF INVENTION
The object of the present invention is to overcome the drawbacks of the known apparatus.
A further object is that of achieving a modular, robust, inexpensive and reliable structure.
According to the invention, an apparatus for checking features of workpieces with rotational symmetry defining a geometrical axis, comprises support and protection means with a base, rest devices fixed to the base for supporting the workpiece with the geometrical axis horizontally arranged, and a support structure coupled to the base; control means; and sensing means coupled to the support structure. The support structure can rotate about a horizontal axis arranged below the axis of the workpiece, in correspondence to a vertical geometrical plane passing through the workpiece geometric axis when the workpiece is positioned on the rest devices. The sensing means are movable with the support structure from a rest position, to allow the loading of the workpiece to be checked on the rest devices, to a working position for bringing the sensing means in cooperation with the workpiece.
The effects and advantages offered by the invention are that the apparatus has small overall dimensions, that it guarantees safe protection of the sensing means especially during the manual or automatic loading phases, high accuracy and reliability, and in addition a convenient accessibility in the case of manual operation.
The sensing means have feelers which are brought to the checking position in such a way that the displacement required for contacting the workpiece always substantially occurs along tangents that are horizontally arranged.
Further advantages attained by the present invention are: an easy insertion, when required, of various components in the apparatus, a simple continuous adjustment of the mutual .position of the various components, the possibility of performing additional adjustments for some of these components in order to keep accuracy and repeatability characteristics unaltered as the nominal dimensions of the workpiece to be checked vary.
BRIEF DESCRIPTION OF DRAWINGS
Specific embodime
REFERENCES:
patent: 2609609 (1952-09-01), Moss
patent: 2625773 (1953-01-01), Cramer et al.
patent: 2688802 (1954-09-01), Jones
patent: 3350785 (1967-11-01), Rawstron et al.
patent: 3795055 (1974-03-01), Zucco
patent: 3905116 (1975-09-01), Roberts
patent: 4473951 (1984-10-01), Golinelli et al.
patent: 4531294 (1985-07-01), Lenz
patent: 4625413 (1986-12-01), Possati et al.
patent: 4811524 (1989-03-01), Corallo
patent: 4914827 (1990-04-01), Cook
Golinelli Guido
Possati Mario
Cuchlinski Jr. William A.
Dowling William C.
MARPOSS Societa' per Azioni
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