Control system for paper-making machines

Claim 1

A MACHINE FOR FABRICATING FIBROUS MATERIAL OF THE TYPE WHEREIN THE FIBROUS MATERIAL EMERGES FROM THE MACHINE AS A MOVING SHEET COMPRISING, IN COMBINATION: MEANS FOR REFINING RAW MATERIAL INTO FIBERS, MEANS FOR PROCESSING SAID FIBERS INTO A MOVING SHEET OF FABRIC MATERIAL, MEANS FOR OBTAINING A REPLICA OF THE SURFACE STRUCTURE OF SAID MOVING FIBROUS MATERIAL BEING FABRICATED, MEANS FOR SCANNING SAID REPLICA TO PRODUCE SAID FIRST SIGNAL REPRESENTATIVE TO THE NUMBER OF SURFACE FIBERS PER UNIT LENGTH OF SAID FIBROUS MATERIAL, COMPUTING MEANS INCLUDING A SOURCE OF SECOND SIGNAL REPRESENTATIVE OF A PREDETERMINED NUMBER OF SURFACE FIBERS PER UNIT LENGTH OF MATERIAL, SAID COMPUTING MEANS BEING RESPONSIVE TO SAID FIRST SIGNAL FROM SAID SCANNING MEANS FOR PRODUCING A THIRD SIGNAL REPRESENATATIVE OF THE DIFFERENCE BETWEEN SAID FIRST AND SECOND SIGNALS, AND CONTROL MEANS COUPLED TO SAID REFINING MEANS, SAID CONTROL MEANS BEING RESPONSIVE TO SAID THIRD SIGNAL FOR ADJUSTING THE REFINING MEANS TO MAINTAIN THE NUMBER OF SURFACE FIBERS PER UNIT LENGTH OF THE MATERIAL BEING FABRICATED APPROXIMATELY EQUAL TO SAID PREDETERMINED NUMBER.

Claim 3

A METHOD OF FABRICATING A SHEET OF FIBROUS MATERIAL HAVING A PREDETERMINED NUMBER OF SURFACE FIBERS PER UNIT LENGTH COMPRISING THE STEPS OF, REFINING RAW MATERIAL INTO FIBERS, PROCESSING SAID FIBERS INTO A FABRIC SHEET, PRESSING A DEFORMABLE SHEET OF MATERIAL ONTO THE SURFACE OF SAID FABRIC SHEET TO PRODUCE DEFORMATIONS DUE TO THE SURFACE STRUCTURE OF THE FABRIC SHEET, COUNTING SAID DEFORMATION OVER A GIVEN LENGTH OF SAID DEFORMABLE SHEET, COMPARING SAID COUNT WITH A PREDETERMINED NUMBER, OBTAINING THE DIFFERENCE BETWEEN SAID COUNT AND SAID PREDETERMINED FIGURE, AND ADJUSTING SAID REFINING STEP IN ACCORDANCE WITH THE DIFFERENCE BETWEEN SAID COUNT AND SAID PREDETERMINED NUMBER TO PRODUCE SAID PREDETERMINED NUMBER OF FIBERS PER UNIT LENGTH IN THE SURFACE OF SAID FABRIC SHEET.

Claim 4

A METHOD OF FABRICATING A SHEET OF FIBROUS MATERIAL HAVING A PREDETERMINED NUMBER OF SURFACE FIBERS PER UNIT LENGTH COMPRISING THE STEPS OF, REFINING RAW MATERIAL INTO FIBERS, PROCESSING SAID FIBERS INTO A FABRIC SHEET, PRESSING A DEFORMABLE SHEET OF MATERIAL ONTO THE SURFACE OF SAID FABRIC SHEET TO PRODUCE DEFORMATIONS DUE TO THE SURFACE STRUCTURE OF THE FABRIC SHEET, COUNTING SAID DEFORMATION OVER A GIVEN LENGTH OF SAID DEFORMABLE SHEET, COMPARING SAID COUNT WITH A PREDETERMINED NUMBER, OBTAINING THE DIFFERENCE BETWEEN SAID COUNT AND SAID PREDETERMINED FIGURE, AND ADJUSTING SAID REFINING STEP IN ACCORDANCE WITH THE DIFFERENCE BETWEEN SAID COUNT AND SAID PREDETERMINED NUMBER TO PRODUCE SAID PREDETERMINED NUMBER OF FIBERS PER UNIT LENGTH IN THE SURFACE OF SAID FABRIC SHEET.