B. Controlling the Activation and the Temperature of the FixingRoller (continuous copying)1. OutlineThe copier’s upper fixing roller is a special thin-coating roller, and its surfacetemperature would tend to increase above the target temperature without control; toensure that it remains at the target temperature, its period of activation and controltemperature are controlled.2. Controlling Period of ActivationThe periods of activation for the main heater (H1) and the sub heater (H2) iscontrolled according to the width of copy paper and the number of copies to be made.As shown in Table 6-201, the period of activation of the sub heater is increased toheat the area of contact (with copy paper; edge heating) for wide copy paper movingthrough the fixing assembly.The period of activation of the sub heater is decreased for narrow copy paper,thereby preventing increase in temperature in areas not coming into contact with paper.When the multi feeder is used, on the other hand, such control in relation to paperwidth is only in response to an input of copy size; in the absence of an input, control isbased on A3 size (11” x 17”).Table 6-201CHAPTER 6 FIXING SYSTEMCOPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON) 6-3Paper widthA3, A4,11” x 17”,LTRB4A4R,LGL,LTRRB5R/STMTPeriod of activationMain heater (H1)ON for 0.3 secON for 0.4 secON for 0.4 secONONSub heater (H2)ON for 0.2 secON for 0.1 secON for 0.1 secOFFOFFUp to16th copy17th copyand later
