Displacement detector
AssigneeMitutoyo Corporation
InventorsMitsuru Tsunoda, Shigeru Ohtani
Life of this patent
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Abstract
A displacement detector which supports either the main scale or the grid to move in a direction perpendicularly intersecting the relative movement direction of the spindle, and which has a spring for pushing one of the main scale and grid toward the other, protrusions for maintaining a predetermined clearance between the urged one of the main scale and grid and the other, and a clearance limiting device for limiting a displacement of the urged one of the main scale and grid from the other to a limited clearance distance to prevent a loss of measuring continuity.
Claims7
A displacement detector having a main scale and grid opposing each other and movable in an axial movement direction with respect to each other and detecting a value of the relative movement as an electrical signal, comprising:
- housing means;
- support means on said housing means for supporting at least one of the main scale and grid for movement in a direction perpendicularly intersecting the relative axial movement direction;
- urging means for pushing one of the main scale and grid toward the other;
- means for maintaining a predetermined clearance dimension between the urged one of the main scale and grid and the other thereof;
- and
- clearance limiting means for adjustably limiting a separating displacement of the urged one of the main scale and grid from the other to a limited clearance distance to prevent a loss of measuring continuity.
The displacement detector according to claim 5, wherein spring pressure of said coil spring is sufficient for said pushing but weak enough to facilitate a smooth sliding of said means for maintaining the predetermined clearance.
Dependencies are inferred from the claim text.