User manual

95.08.23.11.30
Color LaserWriter 12/600 PS Basics & Theory 1–112
Transparency
Mode
The fusing characteristics of overhead transparencies are poorer than
that of normal paper. To improve the fusibility, the feed speed for a
transparency is slowed down to half that of normal paper while the
transparency is passing through the fuser assembly.
The distance between the transfer drum and the fuser assembly is short.
So the trailing edge of the transparency would still be on the transfer
drum when the leading edge has reached the fuser assembly. If the
rotational speed of the fuser roller were slowed down to half its normal
speed without changing the speed of the transfer drum, the feed speed
would differ between the leading and trailing edges of the transparency.
Therefore, the transparency is not separated immediately after the
transfer is completed, but kept on the transfer drum for one additional
rotation. After the transfer is completed up to the trailing edge of the
transparency, the rotational speed of the transfer drum is slowed down
to half its normal speed. At this time, the photosensitive drum is sepa-
rated from the transfer drum so that the toner image on the transparency
will not be disturbed. Subsequently, the transparency leaves the
transfer drum and proceeds to the fuser assembly.
Upper Fuser Roller
Lower Fuser Roller
Separation
Claw
Transfer drum
Transfer Drum
Photosensitive Drum
Transparency
Paper