Ledah DT850 Instruction Manual

FOLD DT850 PAPER FOLDING
MACHINE
OPERATING INSTRUCTION MANUAL

OVERVIEW
1
2
1. Paper Guides
2. Paper Guide Rollers
3. Retarder Roll
4. Indicator Bar
5. 1st Fold Table
6. Fold Scales
7. Conveyor Table
8. On/Off &Speed Control
9. 2nd Fold Table
10. Feed Table
3
4
5
6
7
9
8
10

SETTING UP
1. Unpacking
Carefully unpack the unit and note all following components for assembly
Folding Machine Unit
Folding Plate #1
Folding Plate #2
Feed table plate (with adjustable roller)
Feed table paper guides (two pieces with clamps)
Operating instructions and maintenance tool (Allen key)
A3 Extender Bar
2. Assembly of Paper Folding Machine
Position the machine so the on/off switch and the speed control knob is facing you.
1) Assemble paper guides and fit to the feed table. Adjust the guides to suit the
required paper width.
2) Fit the main paper feed table complete so that the separator roller and main feed
roller are together in the centre.

3) Insert the fold plate #1 into the left top side positioning on the four locating pins
situated on the inside machine housing. Ensure the open end of fold plate is facing
in.
4) Insert the fold table #2 into the right bottom side under the paper feed plate on the
four locating pins on the inside machine housing. Ensure the open end of fold plate is
facing in.

Setting up Fold Types
The DT-850 paper folder is capable of producing all standard fold types along with the ability
to customise folds for individual purposes.
NAME
FOLD TYPE
STOP BAR SETTING
Single Fold
Fold Plate 1: ½
Fold Plate 2: Fit
reverse, closed end
Letter Fold
Fold Plate 1: 2/3
Fold Plate 2: 1/3
Fan Fold
Fold Plate 1: ½
Fold Plate 2: ¼
Double Fold
Fold Plate 1: ½
Fold Plate 2: ¼
Two Fold
Fold Plate 1: ¾
Fold Plate 2: 2/4
Accordion Fold
Fold Plate 1: ¼
Fold Plate 2: ¼

3. Paper Feed Adjustment and Set Up
The paper retarder mechanism is situated under the main feed table. This mechanism is
adjustable to allow the main feed roller to automatically feed single sheets of paper. The
correct adjustment of this retarder is vital to the paper folder machine performance.
The retarder roller is adjusted by the use of a thumb screw situated underneath the main
feed table.
a) With the power off take a sheet of paper and slide between the retarder roller and
main red feed roller.
b) Adjust the retarder roller upwards until a slight drag can be felt, when you try to
remove the sheet. This is the correct set up for single sheet automatic feeding
4. Loading paper into the feed table
Correct loading of the paper into the paper folder is essential for trouble free folding.
Friction fed paper folders like the DT850 requires you to load the paper in a shingled
batch. Instead of the stack of paper being loaded as a square block into the folder, the
stack should be shingled or fanned back so as each end of the stack is now angled or
shingled.
Once this is achieved load the stack of paper into the feed table with the top sheet
positioned into the main (red) feed roller. The folder is now ready to operate
Too much space between the rollers will cause more than one sheet to be fed and can
cause possible jamming. Too tight adjustment will cause paper not to feed and excessive
wear on the feed rollers.

5. Speed Control
The correct speed for general folding applications is around 5,000. If folding multiples
manually then you should increase the speed to around 10,000 per hour. The machine
has a top speed of 15,000. Due to noise levels, in enclosed environments it is
recommended running the machine at speeds below 8,000 per hour.
6. A3 Fold Set Up
When folding A3 sheets insert the extender bar to the feed table plate. This will help
support the extra length of A3 sheets.

Trouble shooting guide
Warning: This machine contains moving parts which can catch hair or loose clothing and
pinch fingers. During operation and maintenance keep hands, hair and loose clothing
clear of moving parts. Service or disassembly of side covers should only be done with
power cords disconnected.
PROBLEM
POSSIBLE CAUSES
Wont feed
Feed rubber rollers glazed or worn
Paper guides too tight
Improper fanning of paper
Static Electricity
Motor belt loose
Feeds more than one
sheet
Retarder mechanism improperly adjusted
Wrinkled paper
Paper guides severely crooked
Worn folding rollers
Folding roller springs worn out
Dirty folding rollers
Jams
Feeding more than single sheet through folding
rollers
Receiving tray full or adjusted improperly
Paper Smudge
Ink not dry
Too much toner on photocopy stock
Paper exiting on top of
fold tables
Dirty or glazed folding rollers