16.1 Components and field of application
the hold-down rods consist of a plate and
a support,
that is secured in the guide rail with ball thrust pieces.
Use the
hold-down rods only for thin printing material(135g/m2) when there are
malfunctions during the sheet infeed (turned-up edges at the front edge,
sheets torn
at the rear edge).
16.2 Inserting the hold-down rod
Installation
• Open the front lay guard(press the open front
lay guard push button on the PU 1 control panel).
• Secure the printing press against being put
into operation. Press the Emergency stop push button on the PU 1 control panel.
• Handle the hold-down rod with care. The plate
bends easily and has sharp edges.
• Insert the hold-down rod into the cut-out D.S.
or O.S.
• Thread the hold-down rod into the guide rail.
When threading in the hold-down rod against the guide rail (press down and
forward, see arrows in Fig.74).
• Push the hold-down rod up to the first lock-in
position toward D.S. or O.S.
17 Pull lay
17.1 Function
There are two pull lays (one on D.S. and one on
O.S.) on the feed table, shortly before the sheets enter the printing unit.
Depending on the required pull direction,
you can select
the pull lay on D.S. and on O.S. via the CP2000 Center.
The pull lays perform the lateral alignment of
all sheets before they are fed into the printing unit.
The pull lay on D.S. pulls the sheets against
the pull stop on D.S. the pull lay on O.S.
the sheet against the pull stop on O.S.
17.2 Function elements
1
Adjusting screw for retainer
2 Feeler
roller for double sheet detection
3 Pull
plate
4
Propelling roller
5
Retainer
6 Pull
sensor
7 Pull
sensor adjusting screw
17.3 Adjusting the sheet size
Adjust the pulling device and pull side on the
CP2000 Center. Please refer to the chapter “Control system,
Printing a
job”.
Once the job data has been accepted,
the
preselected pulling device moves to the position at which the sheet runs
centered through the press.
The inactive pulling device moves out of the
format to an extent that the measuring lever of the double sheet detector still
remains effective. The pull lay channel is covered automatically
When the pulling device is positioned.
Malfunction during the positioning procedure
The pulling device stops if the emergency stop
button is pressed while the pulling device is being positioned. In this case
confirm the sheet size adjustment once more on the CP2000 center. Please refer
to the chapter “Control system, Printing a job”. The pull unit then traverses
to the preselected position.
17.4 Adjusting the suction air
Pull plate and propelling rollers
suck the sheet.
the control system regulates the
suction air volume as a function of the stock thickness.
Light printing material-little
suction air.
Heavy printing material-much suction
air.
Adjusting the suction air manually
Using the buttons(Fig.80/1...4) you
can adjust the suction air volumes of pull plate and propelling roller
separately.
1. Press
The
button(Fig.80/3) to increase the suction air volume on the pull plate.
The
button(Fig.80/4) to reduce the suction air volume on the pull plate.
The
current working pressure of the pull plate is shown on the manometer(Fig.79/2).
If the suction air is too low, the
sheet is not guided
Correctly
up to the pull stop.
If there is too much suction air,
the sheet is deformed at the pull stop.
2. Press
The
button(Fig.80/1) to increase the suction air volume on the traction roll.
The
button(Fig.80/2) to reduce the suction air volume on the propelling roller.
The current
working pressure of the propelling roller is shown on the manometer(Fig.79/1).
If there is not enough suction air, the sheet is not guided correctly to the front lays.
If there is too much suction air ,
thin (light)sheets can be distorted in the area of the traction rolls .
17.5 adjusting the pull lay stop
You an adjust the angle of the pull
stop if the sheets are not cut at right angles or if the
front lays are askew .
In the basic adjustment(orthogonal
position) ,the long mark on the adjustment eccentric(Fig.81/2) is aligned with
the mark on the pull stop.
1. Adjust
the pull stop (Fig.81/1) on the
adjustment eccentric (Fig.81/2) to the edge of the print sheet.
2. At the end of the
job, reset the pull lay stop to a right angle .
17.6 pull lay monitor
A sensor checks the function of the pulling
device.
A signal sounds (only during sheet travel)if
a sheet has not been pulled correctly to the stop of the pulling device. A
pull error is shown on the feeder
display(Fig.82/1) and on the control console .
An infeed error
is signaled if the sheet is too close to the side stop before the pull
procedure is started.
The press remains
in production.
If an infeed
error occurs
1.
increase
the pull distance.
If a pull
error occurs
1. Check
the pull distance setting and the vacuum in pull plate and propelling roller. Preselecting the pull
lay monitor
See chapter” Control
system, Preparing a job”.
Adjusting the pull lay monitor
Note
It ay become necessary to repeat the
basic adjustment after the printing material has been changed.
1. Set
the front lays straight.
2. Set the pull stop such that it is at right angles to the front lay (the long
mark on the adjustment eccentric(Fig.81/2) is at the mark
on the pull stop ).
3. Press twice the
Control panel selection button (Fig.84/1)on
the feeder.
The
LED in the button lights up.
4. Place
a sheet onto the feed table .The sheet must be in contact
with the front lays and the pull stop.
5. Turn the knurled
head screw(Fig.83/1) towards
The
pull lay on O.S.-white arrow,
The
pull lay on D.S.-black arrow,
Until
the display on the MID (Fig.82/1)disappears.
6.
Turn the knurled head screw in the opposite direction , until the
display on the MID (Fig.82/1)lights up.
Basic adjustment:
Continue turning the knurled head screw by 10
notches.
Tip
The sensitivity of the monitor decreases with
the number of notches you turn the screw (larger pull error possible).
The sensitivity of the monitor increases if you
reduce the number of notches you turn the screw.
Example:
One notch corresponds to 0.03 mm. In basic
adjustment, a pull error is reported if the distance
between sheet and sheet stop is more than 0.3 mm after pulling.
17.7 Adjusting the pull distance
Once the format of the printing material has
been entered, the control system automatically adjusts the feeder pile to the
preselected pull distance. You can change the pull distance manually on the
CP2000 Center, on the feeder control console and on the feeder control panel on
D.S. please refer to the chapter “Control system, Printing a job”.
Recommended setting
Adjust a pull distance of 4’’’’6mm. A pull
distance of less than 2 mm may lead to malfunctions in the lateral alignment.
The maximum pull distance is 12 mm.
17.8 Adjusting the retainers
1. Push
two strips of the currently used printing material underneath on D.S.
and on O.S.
2. Using the knurled head screw(Fig. 85/1)
,adjust the height of the retainer(Fig. 85/2).
1 revolution of the knurled screw corresponds
to 0.5 mm.
Retainers up =anti-clockwise
Retainers down =clockwise.
The retainers must guide the strips of paper lightly without squeezing them.
17.9 Removing/installing the retainer
Removing
the retainer
Caution_
Press damage!
Screws or small parts that get into the press
can damage the equipment seriously. Ensure that screws or other small parts
cannot get into the press.
• Using
the knurled screw (Fig.85/1), set the retainer to the topmost position.
Retainers up =anti-clockwise
Retainers down =clockwise.
•
Loosen the
screw(Fig.86/1) from the retainer. Pull the screw from the top and turn it at the same time in anti-clockwise
direction until the screw is fixed at the upper position(Fig.86/1).
Caution-Damaged
retainers can obstruct sheet travel!
Do not bend or
scratch the retainers. Handle the retainers with extreme care when you remove
or install them.
•
Press the
retainer(Fig.86/2) down and out of the support.
Installing the
retainer
•
Install the retainer from the bottom in the support
(Fig.86/2). The spring pins in the retainer must be engaged at the borehole of
the support.
•
Turn the screw (Fig.86/1) clockwise out of the
fixed position and into the retainer.
•
Tighten the screw (Fig.86/1).
•
Align the retainer in parallel to the sheet stop.
•
Adjust the retainer to the currently used
printing material.
