Plural motor generator-fed drive control with variable control between each drive

Claim 1

A VARIABLE SPEED DRIVE FOR A DEVICE SUCH AS A PAPER MACHINE HAVING A PLURALITY OF ROTATABLE ELEMENTS, COMPRISING MEANS PROVIDING A REFERENCE INDICATING A DESIRED GROUP SPEED FOR SAID DRIVE, A SYNCHRONOUS GENERATOR AND MEANS RESPONSIVE TO SAID REFERENCE TO DRIVE SAID GENERATOR AT A SPEED THAT CORRESPONDS TO SAID GROUP SPEED, A PLURALITY OF FREQUENCY RESPONSIVE MOTORS CONNECTED TO BE ENERGIZED BY SAID GENERATOR, VARIABLE TRANSMISSIONS CONNECTING SAID MOTORS TO SAID ROTATABLE ELEMENTS, AND SPEED CONTROL MEANS ASSOCIATED WITH EACH SAID VARIABLE TRANSMISSION FOR CONTROLLING SAID TRANSMISSION TO MAINTAIN THE OUTPUT SPEED OF SAID TRANSMISSION IN A PREDETERMINED RELATION TO SAID GROUP SPEED AND INCLUDING MEANS FOR COMPARING SAID TRANSMISSION OUTPUT SPEED AND SAID GROUP SPEED AND MEANS FOR ADJUSTING SAID SPEED CONTROL MEANS TO VARY SAID PREDETERMINED RELATION, WHEREBY SAID ROTATABLE ELEMENTS CAN BE DRIVEN AT DIFFFERENT SPEEDS WHICH VARY FROM SAID GROUP SPEED.