Flexible or portable closure – partition – or panel – Roll type – With rotating means
Reexamination Certificate
2007-10-16
2007-10-16
Johnson, Blair M. (Department: 3634)
Flexible or portable closure, partition, or panel
Roll type
With rotating means
C160S188000, C318S268000
Reexamination Certificate
active
10774919
ABSTRACT:
A system for controlling a roller shade having a roller tube windingly receiving a shade fabric varies roller tube rotational speed for constant linear shade speed. The desired linear shade speed, roller tube diameter and shade fabric thickness and length are stored in a memory for use by a microprocessor. Preferably, the roller tube rotational speed is varied by the microprocessor depending on shade position determined by signals from Hall effect sensors. The microprocessor maintains a counter number that is increased or decreased depending on direction of rotation. Based on the counter number, the microprocessor determines shade position and a corrected rotational speed for the desired linear shade speed. Preferably, the microprocessor controls roller tube rotational speed using a pulse width modulated signal. The system may be used to control first and second roller shades having roller tubes of differing diameters or shade fabrics of varying thicknesses.
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Carmen, Jr. Lawrence R.
Dolan David J.
Walker Mark A.
Drinker Biddle & Reath LLP
Johnson Blair M.
Lutron Electronics Co. Inc.
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