Electrically heated roller assembly

H - Electricity – 05 – B

Patent

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Details

H05B 3/03 (2006.01) G03G 15/20 (2006.01) H05B 3/00 (2006.01)

Patent

CA 2216832

A heated roller assembly (10) is disclosed having a rotatable roller (12). The roller (12) has a generally cylindrical section (20) with an outer diameter (D) and includes an inner insulative layer (36) thereover, a conductive layer (38) over the inner insulative layer (36), and an outer insulative layer (40) over the conductive layer (38). The roller assembly (10) also has an inwardly projecting conical portion (22) adjacent the cylindrical section (20) of the roller (12) with the inner insulative layer (36), conductive layer (38) and outer insulative layer (40) respectively thereover. A portion (A) of the conductive layer (38) on the conical portion (22) of the roller (12) is exposed. An external contact body (14) has at least one electrically conductive outer surface (46) that projects towards and contacts the conductive layer (38) of the conical portion (22) while piercing an imaginary plane (P1) formed by an extending outer diameter (D) of the cylindrical section (20). A wire (18) having one end connected to a power supply and another end connected to the outer surface (46) of the contact body (14) delivers electricity to heat the roller (12).

L'invention décrit un ensemble rouleau (10) chauffant pourvu d'un rouleau rotatif (12). Ledit rouleau (12) a une section généralement cylindrique (20) de diamètre extérieur (D) et comprend une couche isolante intérieure (36) par-dessus, une couche conductrice (38) par-dessus la couche isolante (36) et une couche isolante extérieure (40) par-dessus la couche conductrice (38). L'ensemble rouleau (10) comporte aussi une partie conique (22) rentrant vers l'intérieur, adjacente à la section cylindrique (20) du rouleau (12), la couche isolante intérieure (36), la couche conductrice (38) et la couche isolante extérieure (40) étant disposées respectivement par-dessus. Une partie (A) de la couche conductrice (38) recouvrant la partie conique (22) du rouleau (12) est découverte. Un corps de contact (14) extérieur possède au moins une surface externe conductrice d'électricité (46) faisant saillie dans la direction de la couche conductrice (38) de la partie conique (22) et étant en contact avec ladite couche tout en perçant un plan imaginaire (P1) formé par le prolongement du diamètre extérieur (D) de la section cylindrique (20). Un fil (18) dont une extrémité est reliée à une alimentation et une autre à la surface extérieure (46) du corps de contact (14) fournit de l'électricité pour chauffer le rouleau (12).

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