Chart paper holder

Claim 1

IN A HOLDER FOR AN ELONGATED SHEET OF CHART PAPER ROLLED ON A SUPPLY TUBE AND HAVING A SERIES OF LONGITUDINALLY SPACED PERFORATIONS THEREIN, THE COMBINATION OF, A SUPPORT, A POWER-DRIVEN ROLL MOUNTED ON SAID SUPPORT FOR ROTATION ABOUT A FIXED AXIS, A SHAFT FIXED AT ONE END TO SAID SUPPORT AND PARALLELING SAID ROLL AXIS, A RADIALLY EXPANSIBLE HEAD ON THE FREE END PORTION OF SAID SHAFT COMPRISING A PLURALITY OF SECTIONS DISPOSED AROUND THE SHAFT TO FORM A SUBSTANTIALLY CYLINDRICAL OUTER SURFACE TELESCOPING INTO ONE END OF THE SUPPLY TUBE, A SERIES OF TEETH ANGULARLY SPACED AROUND SAID ROLL TO MESH WITH THE PERFORATIONS IN THE PAPER AND DRAW THE LATTER FROM THE TUBE AS THE ROLL IS ROTATED IN ONE DIRECTION, AND SPRING MEANS DISPOSED BEWTEEN SAID SECTIONS AND URGING THE LATTER INTO LIGHT FRICTIONAL CONTACT WITH THE TUBE TO EXERT A FRICTIONAL DRAG THEREON WHILE PERMITTING AXIAL SHIFTING OF THE TUBE BACK AND FORTH RELATIVE TO SAID ROLL IN RESPONSE TO STRESSES IN THE PAPER EXERTING AXIAL FORCES ON THE TUBE GREATER THAN THE LIGHT FRICTIONAL FORCE EXERTED BY SAID SPRING MEANS.