Rotary encoder
AssigneeRenishaw PLC
InventorsFinlay Jonathan Evans, James Reynolds Henshaw
Life of this patent
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Abstract
A rotary scale apparatus for an encoder apparatus including a planar disc on which at least one track including scale features is provided, in which the planar disc includes a hole through its centre for receiving a cylindrical shaft, and in which the rotary scale member includes at least three cantilevered spring members which are provided substantially in plane with the planar disc and spaced around the edge of the hole, for engaging with, and radially locating the disc on, a cylindrical shaft inserted therethrough.
Claims20
A rotary scale apparatus for an encoder apparatus, the rotary scale apparatus comprising a planar disc comprising:
- at least one track of scale features for reading by a readhead;
- a through hole;
- and
- at least three integral cantilevered spring members which are (i) provided substantially in plane with the planar disc, (ii) spaced around an edge of the through hole, and (iii) for engaging with, and radially locating the planar disc on, a cylindrical shaft inserted through the through hole.
A rotary scale apparatus for an encoder apparatus, the rotary scale apparatus comprising a planar disc comprising:
- at least one track of scale features for reading by a readhead;
- a through hole;
- and
- at least three cantilevered spring members which are (i) provided substantially in plane with the planar disc, (ii) spaced around an edge of the through hole, and (iii) for engaging with, and radially locating the planar disc on, a cylindrical shaft inserted through the through hole, wherein
- each of the at least three cantilevered spring members has a length that extends in a generally circumferential direction around the edge of the through hole.
A rotary scale apparatus for an encoder apparatus, the rotary scale apparatus comprising a planar disc comprising:
- at least one track of scale features for reading by a readhead on a face of the planar disc;
- a through hole;
- and
- at least three integral cantilevered spring members which are (i) provided substantially in plane with the planar disc, (ii) spaced around an edge of the through hole, and (iii) for engaging with, and radially locating the planar disc on, a cylindrical shaft inserted through the through hole, wherein
- each of the at least three cantilevered spring members has a length that extends in a generally circumferential direction around the edge of the through hole, and
- at least one of the cantilevered spring members extends around the edge of the through hole in an opposite direction to that of another of the cantilevered spring members.
Dependencies are inferred from the claim text.