| 摘要 |
A rotary ring system for use in scale reading apparatus comprises a rotary ring ( 12 ), provided with scale marks on its surface and at least one intermediate member ( 24 ). The at least one intermediate member ( 24 ) is fitted between the rotary ring ( 12 ) and the machine part ( 10 ) on which the rotary ring is to be mounted. Application of a force to the at least one intermediate member adjusts the effective radius of the rotary ring. The at least one intermediate member may be tangentially compliant.
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