A doctor for creping tissue

Details A doctor for creping tissue A doctor for creping tissue

D - Textiles, Paper

21

G

D21G 3/00 (2006.01)

Patent

CA 2191082

A doctor (10) is disclosed for creping tissue (T) from a surface (S) of a Yankee dryer (12). The doctor (10) includes a frame (14) and a support (16) which extends from the frame (14). A swing arm (18) is pivotally secured to the support (16) about a pivotal bearing (20). The swing arm (8) defines a further bearing (22). A pivot (24) extends through the further bearing (22) for rotatable movement relative to the swing arm (18) such that the pivot (24) is rotatably supported by the swing arm (18). A doctor (26) is rigidly secured to the pivot (24) for doctoring the tissue (T) from the surface (S) of the dryer (12). A blade (28) is removably secured to the doctor (26), the blade (28) defining an operative edge (30) which cooperates with the surface (S) of the Yankee dryer (12) for creping the tissue (T) from the surface (S) of the dryer (12). A loader (32) is operatively connected to the pivot (24) for rotating the pivot (24) within the further bearing (22) for loading the operative edge (30) against the surface (S) of the dryer (12). A blade angle changer (34) is operatively connected to the swing arm (18) for pivoting the swing arm (18) relative to the support (16), the arrangement being such that movement of the angle changer (34) selectively changes an angle (.alpha.) defined between the blade (28) and the surface (S) of the dryer (12). The operative edge (30) is disposed substantially along an axis of rotation (36) of the pivotal bearing (20), the arrangement is such that when the blade (28) wears due to contact with the operative edge (30) with the surface (S) of the dryer (12), the angle (.alpha.) is changed to optimize the creping without significantly altering the disposition of the operative edge (30) relative to the surface (S) of the dryer (12).

L'invention concerne une racle (10) destinée à crêper du tissu (T) à partir d'une surface (S) d'un sécheur sectionneur (12). La racle (10) comporte un cadre (14) duquel s'étend un support (16). Un bras pivotant (18) est fixé pivotant au support (16) autour d'un palier pivotant (20). Le bras pivotant (18) définit un autre palier (22). Un pivot (24) s'étend dans le second palier (22) afin de permettre un mouvement rotatif par rapport au bras pivotant (18), de manière que ledit pivot (24) est porté rotatif par le bras pivotant (18). Une racle (26) est fixée rigidement au pivot (24) afin de racler le tissu (T) de la surface (S) du sécheur (12). Une lame (28) est fixée amovible à la racle (26), la lame (28) définissant un bord actif (30) coopérant avec la surface (S) du sécheur sectionneur (12) afin de crêper le tissu (T) de la surface (S) du sécheur (12). Un chargeur (32) est relié fonctionnellement au pivot (24) afin de faire tourner ce dernier (24) dans le second palier (22), de manière à charger le bord actif (30) contre la surface (S) du sécheur (12). Un changeur (34) d'angle de lame est relié fonctionnellement au bras pivotant (18) afin de le faire pivoter par rapport au support (16), l'agencement étant tel que le mouvement du changeur d'angle (34) modifie sélectivement l'angle (.alpha.) défini entre la lame (28) et la surface (S) du sécheur (12). Le bord actif (30) est disposé le long d'un axe de rotation (36) du palier pivotant (20), l'agencement étant tel que lorsque la lame (28) s'use du fait du contact avec le bord actif (30), avec la surface (S) du sécheur (12), l'angle (.alpha.) est changé afin d'optimiser le crêpage sans modifier sensiblement la disposition du bord actif (30) par rapport à la surface (S) du sécheur (12).

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