Control device with microprocessor for a sewing machine

摘要

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