Importance

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Abstract

A doctor for creping tissue from a surface of a Yankee dryer is provided. The doctor includes a frame and a support which extends from the frame. A swing arm is pivotally secured to the support about a pivotal bearing. The swing arm defines a further bearing. A pivot extends through the further bearing for rotatable movement relative to the swing arm such that the pivot is rotatably supported by the swing arm. A doctor is rigidly secured to the pivot for doctoring the tissue from the surface of the dryer. A blade is removably secured to the doctor, the blade defining an operative edge which cooperates with the surface of the Yankee dryer for creping the tissue from the surface of the dryer. A loader is operatively connected to the pivot for rotating the pivot within the further bearing for loading the operative edge against the surface of the dryer. A blade angle changer is operatively connected to the swing arm for pivoting the swing arm relative to the support, the arrangement being such that movement of the angle changer selectively changes an angle defined between the blade and the surface of the dryer. The operative edge is disposed substantially along an axis of rotation of the pivotal bearing, the arrangement is such that when the blade wears due to contact with the operative edge with the surface of the dryer, the angle is changed to optimize the creping without significantly altering the disposition of the operative edge relative to the surface of the dryer.

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First Claim