Patent ID: 6647908
Filing Date: 2003-11-18
Classification: D05B

Abstract:
A microprocessor-assisted sewing machine control equipment, comprisinga computer unit (21) with a memory (23, 30, 37) for a sewing machine control program; and a power output unit (29) with drivers (33-36) for power controlling a controlled sewing machine driving motor (4) and at least another electric motor (8, 9, 13); the sewing machine driving motor (4) being controlled by closed-loop control through a control system (38) in dependence on its rotary position; the at least one electric motor (8, 9, 13) being controlled in a manner tuned to the position of the sewing machine driving motor (4); and a control system (40) which is allocated to the at least one electric motor (8, 9, 13), comprising an open-loop control unit (41.1, 41.2, 41.3) for controlling the at least one electric motor (13) independently of the rotary position; a closed-loop control unit (42.1, 42.2, 42.3) for controlling the at least one electric motor (8, 9) in dependence on the rotary position, based on a rotary-position signal of a rotary-position detector (10, (11) that is disposed on the electric motor (8, 9); and a selection unit (43.1, 43.2, 43.3) which is allocated to the open-loop and closed-loop control units (41.1, 41.2, 41.3; 42.1, 42.2, 42.3) and by which one of the closed-loop control unit (42.1, 42.2, 42.3) and the open-loop control unit (41.1, 41.2, 41.3) is coupled for control with the electric motor (8, 9, 13), depending on whether the electric motor (8, 9, 13) is controlled by closed-loop control in dependence on the rotary position or by open-loop control independently of the rotary position.