Specifications

17
IMAGE TRANSFER/PAPER SEPARATOR CORONAS
17-1. Image Transfer/Paper Separator Coronas
•
The Image Transfer Corona, employing the corotron system, applies a DC
negative corona emission to the underside of the paper thereby attracting
the positively charged toner onto the surface of the paper to form a visible,
developed image of the original.
•
When the image transfer corona output of Image Transfer/Paper Separator
HV HV2 turns ON, a negative DC voltage of about 7kV is applied to the
corona wire and a corona emission is applied.
•
The Paper Separator Corona, employing the corotron system, showers the
underside of the paper with both positive and negative charges so that the
paper can be easily separated from the PC Drum.
•
When the paper separator corona output of HV2 turns ON, an AC voltage
of about 5kV plus positive DC900V bias voltage is applied to the corona
wire and a corona emission is applied. The bias voltage of positive
DC900V applied to the Paper Separator Corona is switched to positive
DC450V in the second copy cycle of the 2-sided copy mode. This
represents the fact that the back side of the copy offers better paper
separation than the front side.
•
In addition to the Paper Separator Corona, Paper Separator Fingers are
also used to ensure that the paper is effectively separated. (For details,
see 18-5. PC Drum Paper Separator Fingers.)
•
The Image Transfer/Paper Separator Coronas Unit is provided with a
Pre-Image Transfer Guide Plate that determines the angle at which the
paper comes into contact with the PC Drum and keeps an optimum
distance between the paper and the PC Drum so that the image may be
properly transferred onto the paper. The Pre-Image Transfer Guide Plate is
secured with an insulating material and connected to the guide plates near
the Synchronizing Rollers. This effectively prevents poor image transfer
occurring due to damp paper when it is very humid. (See p. M-142 for the
guide plates near the Synchronizing Rollers.)
•
There is a mechanism provided that automatically cleans the corona wires
at a given timing, thereby preventing uneven charging caused by a dirty
wire. (For details, see p. M-145.)
Paper Separator Corona Wire
Image Transfer Corona Wire
1075M074AA
M-143