Lift installation with a measuring system for determining...

B - Operations – Transporting – 66 – B

Patent

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Details

B66B 1/34 (2006.01)

Patent

CA 2452661

The invention relates to a lift system comprising an absolute length measuring system for determining the position of a cage which can be displaced along at least one guiding rail, said guiding rail comprising an absolute code mark pattern of a pseudo-random codification arranged in the direction of displacement. One such measuring system enables an increased resolution to be easily achieved in the detection of position over a long displacement path of the lift cage. To this end, the absolute code mark pattern and the incremental code symbol pattern are represented as a single-track combined code mark pattern of the n-position pseudo-random sequence in Manchester encoding, with code marks having the same length, and the code reading device comprises reading stations for scanning successive n+1 code marks, the second code mark of the single-track combined code mark pattern being respectively scanned.

L'invention concerne un système d'ascenseur comportant un dispositif de mesure de longueur destiné à déterminer la position d'une cabine pouvant se déplacer le long d'au moins un rail de guidage, ledit rail de guidage comportant un motif de marques absolu d'un codage pseudo-aléatoire disposé dans le sens de déplacement. Un tel dispositif de mesure permet d'atteindre simplement une résolution élevée dans la détection de position sur un trajet de déplacement important de la cabine d'ascenseur. A cet effet, le motif de marques de code absolu et le motif de symboles de code incrémentiel sont représentés en tant que motif de marques de code combiné à une seule voie de la séquence pseudo-aléatoire à n rangs en codage de Manchester, avec des marques de code de longueur identique, et le dispositif de lecture de code présente des stations de lecture destinées au balayage de n+1 marques de code consécutives, la deuxième marque de code du motif de marques de code combiné à une seule voie étant respectivement balayée.

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