CONTROL APPARATUS TO RETAIN AND REFEED DOOR CURTAINS

The invention provides an apparatus, comprising: a drive unit controller (2302) to selectively move a curtain of a doorway between an open position and a closed position, the curtain comprising a primary projection and a secondary projection, the primary projection to be in guiding engagement with a retainer of a track of the doorway when the curtain is operating in a normal state, the secondary projection to be further from a central region of the doorway than the primary projection, the secondary projection to be confined by an alignment guide; and an analyzer (2306) to determine when the curtain is in a breakaway state associated with one of a restorable condition or a nonrestorable condition, the restorable condition corresponding to the primary projection being dislodged from the retainer while the secondary projection remains confined by the alignment guide, the nonrestorable condition corresponding to the primary projection being dislodged from the retainer and the secondary projection being dislodged from confinement by the alignment guide.