Digital displacement measuring instrument
First Claim
1. A digital displacement measuring instrument, comprising:
- a body;
a spindle slidably provided on the body; and
an encoder that detects displacement of the spindle,wherein the encoder comprises a rotor that rotates in a circumferential direction of the spindle and a stator that is fixed on the body being spaced apart from the rotor by a predetermined gap,wherein the rotor is supported by a rotor bushing comprising an engaging key engageable with a key groove axially provided on an external circumference of the spindle in a manner that the gap between the rotor and the stator is kept constant,wherein the rotor bushing comprises a rotor bushing restrictor that prevents the rotor bushing from moving in a direction away from the stator along the axial direction of the spindle, andwherein the rotor bushing restrictor comprises;
a fixing member fixed on the body; and
a rotor bushing attitude retainer placed between the rotor bushing and the fixing member to be contacted with both of the rotor bushing and the fixing member to keep the rotor bushing in an attitude substantially perpendicular to the axis of the spindle.
1 Assignment
0 Petitions
Accused Products
Abstract
A rotor bushing restrictor (50) that prevents a rotor bushing (44) from moving away from a stator (42) is provided. The rotor bushing restrictor (50) includes a fixing member (51) fixed on a body and a rotor bushing attitude retainer (52) placed between the rotor bushing (44) and the fixing member (51). The rotor bushing attitude retainer (52) includes two first abutment portions (522) contacted with the rotor bushing (44) and two second abutment portions (523) contacted with the fixing member (51). The two first abutment portions (522) are symmetrically placed to each other with respect to the axis of the spindle (2), and the two second abutment portions (523) are symmetrically placed to each other with respect to the axis of the spindle (2). The two first abutment portions (522) and the two second abutment portions (523) are placed such that a straight line connecting the two first abutment portions (522) and a straight line connecting the two second abutment portions (523) are orthogonal with each other.
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Citations
5 Claims
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1. A digital displacement measuring instrument, comprising:
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a body; a spindle slidably provided on the body; and an encoder that detects displacement of the spindle, wherein the encoder comprises a rotor that rotates in a circumferential direction of the spindle and a stator that is fixed on the body being spaced apart from the rotor by a predetermined gap, wherein the rotor is supported by a rotor bushing comprising an engaging key engageable with a key groove axially provided on an external circumference of the spindle in a manner that the gap between the rotor and the stator is kept constant, wherein the rotor bushing comprises a rotor bushing restrictor that prevents the rotor bushing from moving in a direction away from the stator along the axial direction of the spindle, and wherein the rotor bushing restrictor comprises; a fixing member fixed on the body; and a rotor bushing attitude retainer placed between the rotor bushing and the fixing member to be contacted with both of the rotor bushing and the fixing member to keep the rotor bushing in an attitude substantially perpendicular to the axis of the spindle. - View Dependent Claims (2, 3, 4, 5)
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Specification