Thermal pressure fixing device

US4341458A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Winfried Glasa · Frankfurt, DE
• Peter Gumm · Königstein, DE

Key dates

• Filing date: Oct 22, 1980
• Grant date: Jul 27, 1982
• Expiry date: Oct 22, 2000

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G15/2064
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Disclosed is a thermal pressure fixing device for a copier, comprising a pressure roll and a fixing roll for heating and pressing an image-receiving material carrying a toner image, whereby during the passage of the image-receiving material between the rolls the latter are in pressure contact with each other, whereas during a standstill of the copier or in the case of a copier malfunction, the pressure of the rolls is discontinued. There are provided a device for lifting the pressure roll toward the fixing roll and for separating the two rolls, and a clutch and brake mechanism interacting with this device. Resilient elements adapt the center distance between the pressure roll and the fixing roll to the changes occurring in diameter of these rolls, in such a way that the preset roll pressure between the rolls remains constant.