It
goes
without saying
tnat
only a
sharp
and
correctly
set
knife will
produce
a
clean
cut.
Blunt knives are either snarpened with a triangular oilstone by hand (Fig.
2C)
or with
the aid of a knife sharpener. In sharpening the
knife,
take care that the cutting angle
is
preserved
and
that
the
cutting
edge
is
sharpened
thoroughly up to its
innermost
cor
ner
e
which
has
to
take
most
of
the
strain.
18.
Operating
the
trimmer
To
engage
the trimmer, turn lever H (Fig. 19) to the right until it
catches
on lug K on th(
knife carrier. To
disengage
it. lift lever H up slightly and swing it forward.
With the trimmer thrown out of action, the machine
can
be used for ordinary sewing
operations.
R
5436
'si«'
•
Fig.
20
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