- HP Printer User Manual

14 Punch kit unit explanation ENWW
c Detecting the side edge reference
position
When the finisher entrance PS (PS704)
detects the leading edge of paper, M802
(punch shift) runs again to move the
punch unit backward temporarily until
the paper edge sensor detects the side
edge of the paper. If punching is
performed for the paper conveyed from
PI, the time when PS201 (PI
passage/U) or PS206 (PI passage/L)
detects the leading edge of the paper is
the starting point.
Subsequently, M802 runs inversely to
move the punch unit frontward until the
paper edge sensor re-detects the side
edge of the paper. This position
becomes the side edge reference
position.
d Moving the punch position
When the side edge reference position
is detected, M802 (punch shift) moves
the punch unit again so that the center
of punch edges is positioned to the
center of paper. The distance and
direction of this movement differ from
paper sizes. Only when moving
backward, the punch unit makes a stop
at the side edge reference position. The
direction of the movement from the side
edge reference position to the punch
position classified by paper sizes is as
follows:
Frontward:
A5 / A5R / B5R / A4 / A4R / B4 / A3 /
Letter / 8.5 by 14 / 5.5 by 8.5 /
5.5 by 8.5R / 8K / 16K / 16KR
Backward:
B5 / F4 / Letter R / Ledger
The series of movement from “c.
Detecting the side edge reference
position to “d.” “Moving the punch
position” is performed per each paper,
and these movements correct the punch
position.
e Forming a registration loop
M701 (finisher conveyance) turns off
temporarily a specified time after PS37
(paper exit) detects the leading edge of
the paper to form a loop at the entrance
roller. If punching is performed for the
paper conveyed from PI, the loop will be
formed on the PI's side.
f Punch movement
When finisher entrance PS (PS704)
detects the trailing edge of the paper,
M801 (punch) runs and performs the
punch movement. For some paper
sizes, the punch movement is executed
before completing the correction of the
punch position for the punch unit. To
avoid this, switch the conveyance speed
on finisher to a low speed only for such
paper size.
If punching is performed for the paper
conveyed from PI, the time when the
trailing edge of the paper is detected by
PS206 (PI passage/L) is the starting
point.
g Paper edge sensor
To detect the side edge of the paper, the
paper edge sensor mounted on the
punch unit is used. The paper edge
sensor consists of 5 sensors shown in
the below figure. Which sensor is used
depends on the paper sizes.
Paper size Conveyance speed
A5 / 5.5 by 8.5R 345 mm/s
Other sizes 670 mm/s
Paper edge sensor
Direction of paper
conveyance