Elevator installation with a measuring system for determining absolute car position
First Claim
1. A position measuring system for an elevator installation for determining a position of an elevator car movable along at least one guide rail, comprising:
- a strip having a code mark pattern and adapted to be mounted near the elevator car and parallel to a travel direction of the elevator car;
a code reading device adapted to be mounted on the elevator car for contactless scanning of said code mark pattern; and
an evaluating unit connected to said code reading device for evaluating said scanned code mark pattern, wherein “
n”
successive code marks of said code mark pattern form a code word, a plurality of different ones of said code words are unambiguously arranged in an n-digit pseudo random sequence, said code words form a single-track of said code mark pattern and that each said code word represents an absolute car position.
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Accused Products
Abstract
An elevator car position measuring system includes a strip having a code mark pattern mounted near the elevator car and parallel to a travel direction, a code reading device mounted on the elevator car for contactless scanning of the code mark pattern and an evaluating unit connected to the code reading device for evaluating the scanned code mark pattern. A code word is formed by “n” successive code marks of the code mark pattern, a plurality of different ones of the code words are unambiguously arranged in an n-digit pseudo random sequence, the code words form a single-track of the code mark pattern and each of the code words represents an absolute car position. A floor sensor mounted on the elevator car detects position markings at floor levels along the travel direction and is connected to the evaluating units for evaluating the detected position markings against said scanned code words.
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Citations
16 Claims
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1. A position measuring system for an elevator installation for determining a position of an elevator car movable along at least one guide rail, comprising:
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a strip having a code mark pattern and adapted to be mounted near the elevator car and parallel to a travel direction of the elevator car;
a code reading device adapted to be mounted on the elevator car for contactless scanning of said code mark pattern; and
an evaluating unit connected to said code reading device for evaluating said scanned code mark pattern, wherein “
n”
successive code marks of said code mark pattern form a code word, a plurality of different ones of said code words are unambiguously arranged in an n-digit pseudo random sequence, said code words form a single-track of said code mark pattern and that each said code word represents an absolute car position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A position measuring system for an elevator installation for determining a position of an elevator car movable along at least one guide rail, comprising:
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a strip having a code mark pattern and adapted to be mounted near the elevator car and parallel to a travel direction of the elevator car;
a pair of code reading devices adapted to be mounted on the elevator car for contactless scanning of said code mark pattern; and
a pair of evaluating units each connected to a respective one of said code reading devices for evaluating said scanned code mark pattern, wherein “
n”
successive code marks of said code mark pattern form a code word, a plurality of different ones of said code words are unambiguously arranged in an n-digit pseudo random sequence, said code words form a single-track of said code mark pattern and that each said code word represents an absolute car position. - View Dependent Claims (16)
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Specification