Additional
Instructions
for Pfaff 342, 344 and 346 two-needle, cylinder-bed sewing machine with right-hand
balance
wheel
and
the
Pfaff 354
two-needle
machine
with
left-hand
balance
wheel
The basic instructions given for the single-needle machines analogously apply to the
corresponding
two-needle
versions
of
these
machines,
too.
Additional
instructions
are
contained
on
the
following
pages.
19.
Upper
Threading
of
Two-Needle
Machines
Thread the right needle like on a single-needle sewing machine, leading it from 1 to 12
as
illustrated
in
Fig.
19.
To thread the left needle, pass the thread
from
spool 13 (Fig. 19) through the holes of
thread
guide
2,
the
upper
hole
of
thread
guide
3.
thread
retainer
14,
clockwise
around
anc
between tension discs 15, around the rear thread controller disc 16, through thread check
spring 7, up and through thread guide 8,
from
right to left through the upper hole of
take-up lever. 9. down and through thread guides 8 and 10, the left hole of
needle
holder
17,
an^from
right
to
left
through
the eye of the left needle
18.
The thread tension
is
regulated
by
turning
nut
2.
R
8320
Fig. 19
20.
Cleaning
the
Sewing
Hooks
of
Two-Needle
Machines
The
instructions
given
for
cleaning
the
sewing
hook
of a
single-needle
machine
iiv
apply
to
the
sewing
hooks
of
two-needle
machines.
It
should
be
noted,
however
bobbin
case
opener
L of
the
second
hook
is
arranged
in a
position
diagonally
a
from
that
of
the
other
bobbin
case
opener
(Fig.
20).
The
needle
plate
is
secured
in
position
by
screws
a
and
b (Fig. 21)
and
the
feec
by
screws
c
and
d
(Fig.
20).
R
8317
h
Fig.
20
R
8316
Fig. 21
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