Doctor for creping tissue

A doctor for creping tissue from a surface of a Yankee dryer, said doctor comprising:

• a frame;
• a supporting means extending from said frame;
• a swing arm means pivotally secured to said supporting means about a pivotal bearing, said swing arm means defining a further bearing;
• pivot means extending through said further bearing for rotatable movement relative to said swing arm means such that said pivot means is rotatably supported by said swing arm means;
• doctor means rigidly secured to said pivot means for doctoring the tissue from the surface of the dryer;
• blade means removably secured to said doctor means, said blade means defining an operative edge which cooperates with the surface of the Yankee dryer for creping the tissue from the surface of the dryer;
• loading means operatively connected to said pivot means for rotating said pivot means within said further bearing for loading said operative edge against the surface of the dryer;
• blade angle changing means operatively connected to said swing arm means for pivoting said swing arm means relative to said support means, the arrangement being such that movement of said blade angle changing means selectively changes an angle defined between said blade means and the surface of the dryer;
• said operative edge being disposed substantially along an axis of rotation of said pivotal bearing, the arrangement being such that when said blade means wears due to contact of said operative edge with the surface of the dryer, said angle is changed to optimize said creping without significantly altering the disposition of said operative edge relative to the surface of the dryer;
• and
• said pivotal bearing being constructed so as to define a void which permits the ready access to said means;
• and
• said blade angle changing means further including:
• a first and second jack means spaced relative to each other such that said doctor means is disposed therebetween;
• each of said jack means having a first and a second end, said first end being pivotally secured to said frame, said second end being pivotally secured to said swing arm means;
• and
• worm gear means extending between said first and second jack means, the arrangement being such that rotation of said worm means simultaneously adjusts both said first and said second jack means so that said angle along the entire length of said blade means relative to the surface of the dryer is simultaneously changed.