Fixing Film Edge Cooling Control; Film Unit Engagement/Disengagement Control - Canon imageRUNNER ADVANCE C5500 Series Service Manual

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Table of Contents

Startup conditions:

When switching to paper that is wider than the preceding sheet while printing and the detected temperature of the Main Thermistor

(front/rear edge of the Fixing Heater) and Sub Thermistor (front/rear edge of the Fixing Film) at that time exceeds the designated

The paper interval is increased to decrease temperature, and feeding the succeeding sheet and power supply to the Heater are

Termination condition:

This down sequence is terminated at the point when any of the following conditions is satisfied.

• When the detected temperature of the Main Thermistor (front/rear edge of the Fixing Heater) and Sub Thermistor (front/rear

edge of the Fixing Film) is at or below the designated temperature

• When specified time has elapsed after the preceding sheet passed the fixing nip

Fixing Film Edge Cooling Control

Temperature at the edge of the film rises during continuous printing. Excessive temperature rise leads to film deterioration, so it

enters down sequence when printing small-size paper (paper with the width-direction length of A4R or less).

In the event that the film temperature exceeds the designated temperature (Main Thermistor; front/rear edge of the Fixing Heater,

Sub Thermistor; front/rear edge of the Fixing Film) when printing paper with the width-direction length of A4R or larger to A3 or

smaller, temperature increase is controlled by ventilating and cooling the film from the fan provided near the Fixing Assembly.

Unlike down sequence, there is no reduction in throughput because this control is performed while continuing to print.

A shutter is provided in the vent, which opens and operates at seven different positions according to the size of paper to be fed.

This enables air to be blown to the most suitable area of the film.

The Film Unit is disengaged from the Pressure Roller under a specific condition in order to prevent deformation of the Fixing Film/

Pressure Roller due to heat and pressure that arise when the drive of the Pressure Roller stops, and to improve jam removability.

Direction of movement

2. Technology