Apparatus for constant-tension winding and unwinding of web materials in dyeing apparatus

Claim 1

AN APPARATUS FOR CONTROLLING A PAIR OF D.C. MOTORS, ONE FOR UNWINDING CONTINUOUS WEB MATERIAL AND THE OTHER FOR WINDING SAID WEB MATERIAL, EACH MOTOR HAVING A SEPARATELY EXCITED FIELD WINDING, SAID APPARATUS COMPRISING A RESISTOR FOR PRODUCING A D.C. VOLTAGE DROP THEREACROSS IN ACCORDANCE WITH THE ARMATURE CURRENT OF SAID WINDING MOTOR, A FIRST ELECTRONIC TUBE HAVING A GRID, A CATHODE AND AN ANODE, MEANS FOR APPLYING A VARIABLE NORMAL BIAS TO SAID GRID, MEANS FOR ADDITIONALLY APPLYING SAID VOLTAGE DROP TO SAID GRID, A SATURABLE REACTOR INCLUDING A D.C. COIL CONNECTED IN THE ANODE CIRCUIT OF SAID TUBE, AND AN A.C. OUTPUT COIL, A SOURCE OF A.C. COUPLED TO SAID COIL, A FULL-WAVE RECTIFIER ENERGIZED IN ACCORDANCE WITH THE OUTPUT OF SAID A.C. COIL, MEANS FOR SUPPLYING THE D.C. OUTPUT OF SAID RECTIFIER TO SAID FIELD WINDING OF WINDING MOTOR, A SERIES-CONNECTED RECTIFIER AND POTENTIOMETER ENERGIZED IN ACCORDANCE WITH SAID OUTPUT OF SAID A.C. COIL, A SECOND ELECTRONIC TUBE HAVING A GRID, A CATHODE AND AN ANODE, MEANS FOR APPLYING A VARIABLE NORMAL BIAS TO SAID GRID OF SAID SECOND TUBE, MEANS FOR DIFFERENTIALLY APPLYING THE D.C. OUTPUT OF SAID POTENTIOMETER TO SAID GRID OF SAID SECOND TUBE, A SECOND SATURABLE REACTOR INCLUDING A D.C. COIL ENERGIZED IN ACCORDANCE WITH THE ANODE CURRENT OF SAID SECOND TUBE, AND AN A.C. OUTPUT COIL COUPLED TO SAID A.C. COURSE, A SECOND FULL-WAVE RECTIFIER ENERGIZED IN ACCORDANCE WITH THE OUTPUT OF SAID A.C. COIL OF SAID SECOND SATURABLE REACTOR, AND MEANS FOR SUPPLYING THE D.C. OUTPUT OF SAID SECOND FULL-WAVE RECTIFIER TO SAID FIELD WINDING OF THE UNWINDING MOTOR.

Claim 2

AN APPARATUS FOR CONTROLLING A PAIR OF D.C. MOTORS, ONE FOR UNWINDING CONTINUOUS WEB MATERIAL AND THE OTHER FOR WINDING SAID WEB MATERIAL, EACH MOTOR HAVING A SEPARATELY EXCITED FIELD WINDING, SAID APPARATUS COMPRISING A RESISTOR FOR PRODUCING A D.C. VOLTAGE DROP THEREACROSS IN ACCORDANCE WITH THE ARMATURE CURRENT OF SAID WINDING MOTOR, A FIRST ELECTRONIC TUBE HAVING A GRID, A CATHODE AND AN ANODE, MEANS FOR APPLYING A VARIABLE NORMAL BIAS TO SAID GRID, MEANS FOR ADDITIONALLY APPLYING SAID VOLTAGE DROP TO SAID GRID, A SATURABLE REACTOR INCLUDING A D.C. COIL CONNECTED IN THE ANODE CIRCUIT OF SAID TUBE, AND AN A.C. OUTPUT COIL, A SOURCE OF A.C. COUPLED TO SAID COIL, A FULL-WAVE RECTIFIER ENERGIZED IN ACCORDANCE WITH THE OUTPUT OF SAID A.C. COIL, MEANS FOR SUPPLYING THE D.C. OUTPUT OF SAID RECTIFIER TO SAID FIELD WINDING OF WINDING MOTOR, A SERIES-CONNECTED RECTIFIER AND POTENTIOMETER ENERGIZED IN ACCORDANCE WITH SAID OUTPUT OF SAID A.C. COIL, A SECOND ELECTRONIC TUBE HAVING A GRID, A CATHODE AND AN ANODE, MEANS FOR APPLYING A VARIABLE NORMAL BIAS TO SAID GRID OF SAID SECOND TUBE, MEANS FOR DIFFERENTIALLY APPLYING THE D.C. OUTPUT OF SAID POTENTIOMETER TO SAID GRID OF SAID SECOND TUBE, A SECOND SATURABLE REACTOR INCLUDING A D.C. COIL ENERGIZED IN ACCORDANCE WITH THE ANODE CURRENT OF SAID SECOND TUBE, AND AN A.C. OUTPUT COIL COUPLED TO SAID A.C. COURSE, A SECOND FULL-WAVE RECTIFIER ENERGIZED IN ACCORDANCE WITH THE OUTPUT OF SAID A.C. COIL OF SAID SECOND SATURABLE REACTOR, AND MEANS FOR SUPPLYING THE D.C. OUTPUT OF SAID SECOND FULL-WAVE RECTIFIER TO SAID FIELD WINDING OF THE UNWINDING MOTOR.