JPS6433247A - Drive control apparatus of loom - Google Patents

Abstract

PURPOSE: To provide the subject device capable of maintaining failsafe state always by maintaining the power-off of a power motor, and a holding circuit of a safety relay by inputting a stopping signal caused by picking defect or the like to an electronic controlling circuit and a maintenance-controlling circuit, and returning the power motor to a restarting state after finishing the self-maintenance by the electronic controlling circuit. CONSTITUTION: A stopping signal is inputted to an electronic controlling circuit and a maintenance-controlling circuit when a picking defect or the like is developed under operation of a loom. The electronic controlling circuit degausses a conductor for operation of shut off the power of the power motor, and, on the other hand, the maintenance-controlling circuit outputs a self-maintaining signal to maintain a holding circuit of a safety relay, and also rotates the power motor in the direction required for the maintenance through the electronic controlling circuit. An on-delay timer of a related movement-controlling circuit is kept in the on-state for a prescribed delayed time from the input of the self maintaining signal. When the self maintaining operation is finished, the before self maintaining signal is changed, and according to the change, the electronic controlling circuit magnetizes the conductor for operation to set the power motor to a restarting state. As the result, the driving system is always operated in a failsafe state.