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Temperature Dependent Warm-Up Method

IP.com Disclosure Number: IPCOM000050633D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chang, JP: AUTHOR [+2]

Abstract

A fuser warm-up method will be described which depends on the fuser temperature when power is applied. This idea is especially useful in small copiers.

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Temperature Dependent Warm-Up Method

A fuser warm-up method will be described which depends on the fuser temperature when power is applied. This idea is especially useful in small copiers.

Small copiers with hot roll fusers but unheated back-up rolls usually use a heat lamp for bringing the hot roll up to its proper operating temperature. The back-up roll is then heated by contact with the hot roll.

When the copier is initially powered up for the day, the hot roll will be heated but the back-up roll will remain relatively cool. Consequently, the first copies through the machine will not be properly fused until the back-up roll is heated by its contact with the hot roll.

One solution to the problem is to apply additional power to the fuser roll to heat the back-up roll. It may, however, not be desirable to add the extra power to the fuse roll when powering up because the back-up roll may already be heated. For example, the copier may be shut down to clear a paper jam from the paper transport path. When powered on, the back-up roll is already warm from previous use.

The following method provides a better solution. When the copier is powered on, the controller senses the temperature of the fuser. If it is below a threshold value, e.g., 150 degrees C, full power is applied until the fuser reaches its operating temperature. The fuser temperature will then overshoot, providing the additional energy to heat the back-up roll. If the fuser temperature is not below the thr...