Ricoh FT4460, Service Manual, Page: 124 / 413

28 February 1989
10. IMAGE FUSING AND PAPER EXIT
10.1 OVERVIEW
Two fusing rollers, which apply heat and pressure, fuse the image to the copy
paper. The hot roller [A] is made of teflon, and the pressure roller [B] is made
of silicon rubber with a teflon sleeve. Pressure is constantly applied between
the rollers.
The fusing lamp [C], which is located at the hot roller axis, is turned on and
off to maintain the operating temperature. The temperature control circuit
monitors the hot roller surface temperature through a thermistor [D].
The thermofuse (169°C) [J] prevents the fusing temperature from exceeding
400 ± 50°C.
This model uses an oilless hot roller system, and does not have a hot roller
cleaning mechanism. The hot roller strippers [G] separate the copy from the
hot roller and direct it to the fusing exit-rollers [H]. The lock
pressure lever tension springs [I] adjusts the roller pressure.
2-71
position of the