Equipment on automatic doors for the recognition of obstacles

Details Equipment on automatic doors for the recognition of obstacles Equipment on automatic doors for the recognition of obstacles

B - Operations, Transporting

66

B

342/17.2

B66B 13/26 (2006.01) H03K 17/955 (2006.01) H03K 17/98 (2006.01)

Patent

CA 1269434

ABSTRACT OF THE DISCLOSURE Capacitive sensors (A, B, C,) are attached to the closing edges of especially automatically controlled elevator doors, which (sen- sors) produce error signals ( .DELTA. U) by way of differential ampli- fiers (1, 2) if their antennas A, B, C,) are capacity influenced by an obstacle or a disturbance. A door travel detector (25), which senses (or scans) the entire door region in incremental travel dis- tances ( .DELTA. S) of, for instance, 1 cm in fine steps respectively quasi-steadily, controls by way of the pulse generator (26) the compensators (3, 4,), which consist of the threshold value detector (18, 22), forward-/reverse counter (19, 23) and digital-/analog con- verter (:20, 24). Every error signal ( .DELTA. U) is subjected to a com- pensation at every door movement piece by piece (?) for every travel distance (S) and the determined compensation value per travel dis- tance ( .DELTA. S) and per floor stored in the incremental balancing storage (16, 17) and corrected at the next compensation cycle. In this the compensation maximally attainable per travel distance ( .DELTA. S) is chosen in such a manner that it is hardly of great importance for rapidly variable obstacle signals caused by persons or objects, while slowly variable error signals, due to, for instance, mechani- cal tolerences or temperature variations, are reduced to a minimal residual amplitude. For this reason obstacle signals will prevent, stop or reverse a door closing movement by way of the majority gate (15), the evaluating circuit (5) and the door circuits (30, 31, 32, 33, 34, 35) while error signals remain ineffective with regard to door control.

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