CONTROL DEVICE FOR BORING MACHINE

THE OPERATION OF AN ELECTRIC DRILL IS INHIBITED WHEN IT IS INTERRUPTED BY AN ABRUPT FAULT SUCH AS POWER FAILURE AND THEN THE FAULT IS RECOVERED, OR WHEN THE COIL OF AN ELECTROMAGNET HAS A TROUBLE SUCH AS DISCONNECTION. AFTER THE FAULT IS ELIMINATED WITH A POWER SWITCH (50) REMAINING CLOSED FOR ENERG...

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Bibliographische Detailangaben
Hauptverfasser:	KEIICHI MURAKAMI, MICHIHIRO SHOJI
Format:	Patent
Sprache:	eng
Schlagworte:	BORING CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER CUTTING CUTTING-OUT ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION HAND CUTTING TOOLS HAND TOOLS MACHINE TOOLS MANIPULATORS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORATING PERFORMING OPERATIONS PORTABLE POWER-DRIVEN TOOLS PUNCHING SEVERING SEVERING BY MEANS OTHER THAN CUTTING STAMPING-OUT STORAGE MEANS FOR WORKSHOPS TRANSPORTING TURNING WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK
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Beschreibung
Zusammenfassung:	THE OPERATION OF AN ELECTRIC DRILL IS INHIBITED WHEN IT IS INTERRUPTED BY AN ABRUPT FAULT SUCH AS POWER FAILURE AND THEN THE FAULT IS RECOVERED, OR WHEN THE COIL OF AN ELECTROMAGNET HAS A TROUBLE SUCH AS DISCONNECTION. AFTER THE FAULT IS ELIMINATED WITH A POWER SWITCH (50) REMAINING CLOSED FOR ENERGIZING THE ELECTROMAGNET AND THE ELECTRIC DRILL, A PHOTOCOUPLER (38) TURNS ON A THYRISTOR (31) TO DISABLE THE CONDUCTION OF A TRANSISTOR (35). AS THE RESULT, A DRILL MOTOR(16)WILL NOT START BEFORE THE MAGNETIZATION OF THE ELECTROMAGNET. THE TROUBLE IN THE COIL (27) IS DETECTED BY A POTENTIAL EXAMINING CIRCUIT (30) MEASURING A POTENTIAL DIFFERENCE ACROSS A RESISTOR (31). THE DETECTION OF THE TROUBLE CAUSES THE THYRISTOR (31) TO INTERRUPT THE CONDUCTION OF THE TRANSISTOR (35). ACCORDINGLY, THE ELECTRIC DRILL WILL NOT START AGAIN UNLESS IT IS SECURELY ANCHORED BY THE ELECTROMAGNET.