Scale reading apparatus
First Claim
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1. A scale for a scale reading apparatus comprising:
- a track having scale markings;
markers of two or more different states;
wherein a marker of a first state has a first function, a marker of a second state has a second function and markers of both first and second states have a third function and wherein at the position with markers of both first and second states, the marker of the second state extends further than the marker of the first state on at least one side.
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Abstract
A scale for a scale reading apparatus has a scale track with scale marks which form an incremental scale. The scale also has a set of reference marks. The scale has at least one additional track and different combinations of markers in the at least one additional track have different functions, for example reference mark enablers and right and left limit switches.
21 Citations
14 Claims
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1. A scale for a scale reading apparatus comprising:
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a track having scale markings; markers of two or more different states; wherein a marker of a first state has a first function, a marker of a second state has a second function and markers of both first and second states have a third function and wherein at the position with markers of both first and second states, the marker of the second state extends further than the marker of the first state on at least one side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification