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US 3,996,669 AGranted
Wide-range device for measuring the linear sizes of mechanical workpieces
AssigneeFinike Italiana Marposs-Soc. In Accomandita Semplice di Mario Possati & C.
InventorCesare Anichini
Life of this patent
Estimating the term…
Abstract
A wide-range device for measuring the sizes of mechanical pieces which includes at least one measuring head, a support for said at least one measuring head with a narrow-range measuring transducer, a D.C. motor, a position transducer with reciprocally moving elements having a scale with equidistant reference positions, a position servo-system to position a reference element integral with the measuring head in correspondence with one of the reference positions of the scale, a reader connected to the measuring head to indicate the measure in intervals comprised between the reference positions of the scale and circuits to control the motor.
Claims10
A wide-range measuring device for measuring the sizes of mechanical workpieces, comprising:
- support means;
- mechanical guide means carried by said support means;
- slide means movable along said guide means;
- measuring head means fixed on said slide means and having distance-measuring transducer means covering a determined measuring range;
- driving and positioning means coupled to said slide means and including:
- motor means;
- transmission means driven by the motor means and coupled to the slide means for displacing the latter in either direction along said guide means;
- position transducer means covering a measuring range wide in comparison with that of said distance measuring transducer means, and comprising reciprocally moving elements fixed to said support means and slide means, respectively, said position transducer means including means for providing error signals upon deviation of the relative position of said moving elements from a number of determined reference positions thereof;
- and circuit means connected to said position transducer means and to said motor means to feed to the latter said error signals for driving the motor means to position said reciprocally moving elements in correspondence with said reference positions;
- said circuit means including switch means for activating the feeding of said motor means by said error signals when said slide means reaches a position at which the distance measuring transducer means has a predetermined spatial relationship with respect to the workpiece to be measured, when the latter is located in the measuring position with respect to the measuring device;
- and output means coupled to said measuring head means and said position transducer means for obtaining the size of the workpiece by combination of signals depending on the relative position of said reciprocally moving elements and signals provided by said distance-measuring transducer means.
8 more elements
A wide-range measuring device for measuring the sizes of mechanical workpieces, comprising:
- mechanical support means;
- mechanical guide means carried by said support means;
- slide means movable along said guide means in either of two directions towards and away from the workpiece to be measured;
- measuring head means fixed on said slide means and having distance-measuring transducer means covering a determined measuring range and movable feeler means for contacting the workpiece, the feeler means being coupled to the distance-measuring transducer means;
- and
- driving and positioning means including:
- electrical motor means;
- mechanical transmission means coupled to the motor means and to the slide means for displacing the latter in either of said directions;
- position transducer means comprising stationary means fixed to said support means, movable means fixed to said slide means and electrical circuit means for providing electrical error signals depending on deviations of said movable means from determined reference positions, relative to the stationary means, locating wide subdivisions of the measuring range of the measuring device, said determined measuring range of the distance-measuring transducer means covering at least the interval comprised between two adjacent wide subdivisions;
- and
- circuit means for driving said electrical motor means, including:
- feeding circuits for feeding the motor means;
- first connecting circuits for connecting said distance-measuring transducer means to said feeding circuits;
- second connecting circuits for connecting said electrical circuit means of the position transducer means to said feeding circuits;
- switch means for activating the feeding of said motor means through said feeding circuits by said error signals when said slide means reaches a position at which said feeler means is displaced by a predetermined amount, the motor means being fed by the distance measuring transducer means -- through the feeding circuits -- prior to the actuation by said switch means of the feeding of the motor by the error signals, the feeding of the motor means by the distance-measuring transducer means being deactuated by the switch means at the same time the feeding by the error signals is actuated;
- and output means coupled to said measuring head means and said position transducer means for obtaining the size of the workpiece by combination of signals depending on the relative position of said reciprocally moving elements and signals provided by said distance-measuring transducer means.
13 more elements
Dependencies are inferred from the claim text.