Paper Transport Operation In Duplex Print - Sharp AR-M550N Service Manual

C. Operational descriptions

(1) Paper transport operation in duplex print

a. Switchback operation and transport to the reverse section
1) The paper transported from the fusing section is sent to the paper
exit roller 1 (which is driven by the paper exit motor 2 (POM2)) with
the transport roller 16 (which is driven by the paper exit motor 1
(POM1)).
At this time, paper is passed under the paper exit guide. After
paper passing, the paper exit gate guide falls down by its own
weight.
2) When the specified time has passed from detection of the paper
lead edge by POD1 (paper exit detection from fusing), POM2
rotates in the normal direction, then rotates in the reverse direction
in the specified time. (The rotation time differs depending on the
paper size.)
3) When POM2 rotates reversely, paper is transported to the reverse
section.
At that time, paper is passed over the paper exit gate guide which
fell down by it own weight.
POM1
POM2
POD1
POM1
POM2
AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 51
4) When the specified time has passed from reverse rotation of
POM2, DGS (paper exit guide) turns on for a certain time and
paper is sent to the reverse section.
5) POM2 stops after passing the specified time from detection the
paper lead edge by AINPD (duplex paper entry detection). It rota-
tion is changed from reverse direction to normal direction to trans-
port the next paper.
RRC
439mS
POM1
120mS
POM2
485mS
572mS
DGS
ADUM1
50mS
ADUM2
POD1
POD2
AINPD
APPD1
APPD2
b. Paper transport speed in duplex print
The transport speed in duplex print is changed to the high speed
(800mm/sec) to increase the job speed in some positions of paper.
The transport speed is changed to the high speed in the Following
positions:
1) From when the paper rear edge passes the fusing section to when
switchback operation is started.
2) From when switchback operation is started to when a certain
amount of paper is transported after passing APPD1 (Paper pass
detection sensor in upstream of duplex).
3) After that, paper is stopped at the duplex paper feed position and
fed to the machine again. (The paper feed speed to the machine is
335mm/sec.)
ADM1
DGS
POM2
166mS
25mS
37mS
102mS
168mS