Operation Manual

6.
Setecting
the
Correct
Need!e
To
ensure
a reliable
stitch
formation,
make
sure
the
correct
needle
is
inserted
in
the
machine.
Needle
Systems
The
Pfaff
145
unison-feed
machine
in
Models
H
1
and
H
2
uses
System
134
needles,
while
Model
H
3
uses
System
134-35,
and
Model
H
4
System
190
needles.
Needle
Point
Styles
These
needles
are
available
with
different
type
points
to
suit
different
requirements.
The
various
needle
point
styles
are
identified
by
a
letter
following
the
needle
system,
e.g.
134
R.
Fabrics
are
stitched
with
a
round-point
needle,
identified
by
14,
while
for
leather
work
needles
are
available
with
the
following
point
styles:
Lr
•
Narrow
reverse
twist
point
LI
4
Narrow
twist
point
Lack
—
Patent
leather
point
p
•
Extra-narrow
wedge
point
PCr
Extra-narrow
wedge
point
with
right-twist
groove
PCI
Extra-narrow
wedge
point
with
left-twist
groove
S
I
Narrow
cross
point:
for
long,
straight
stitches.
D
.4
Triangular
point:
for
short,
straight
stitches.
Vr
0
Reverse
twist
spear
point
VI
Twist
spear
point
Rubberized
fabrics
and
plastic
materials
are
sewn
with
round-point
needles.
Needle
and
Thread
Sizes
The
correct
needle
size
is
dependent
on
the
fabric
and
thread
weights.
For
best
results,
select
the
needle
as
thin
as
possible,
but
make
sure
the
thread
can
be
pulled
through
the
needle
eye
easily.
The
needle
size
should
be
selected
to
match
not
only
the
thread
weight,
but
also
the
machine
model.
The
needle
size
is
indicated
on
the
shank
in
hundredths
of
millimeters.
Thus,
a
No.
100
needle
has
a shaft
diameter
of
100 /loo
=
1
mm.
6