System and method for re-synchronizing an access barrier...

Details System and method for re-synchronizing an access barrier... System and method for re-synchronizing an access barrier...

2008-04-15

2008-04-15

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C318S280000, C318S466000

Reexamination Certificate

active

11359128

ABSTRACT:
A system for re-synchronizing an access barrier with a barrier operator comprises an access barrier, and a barrier operator to profile and monitor the manual and automatic movements of the access barrier. The barrier operator comprises a controller, a memory, a motor pivot encoder, and a counting encoder. The memory contains a primary counter to store the distance measured by the counting encoder, while a secondary counter maintains a value equal to the travel of the access barrier as determined by a profiling operation initiated prior to operating the barrier operator. The controller takes into account the counts of the primary and secondary counters, along with the stored profile information, allows the re-synchronization system to determine the proper amount of movement to be applied to open or close the access barrier, in the event the access barrier has been manually moved.

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