To
adjust,
loosen
screw
a on needle bar
connecting
stud,
and set needle bar
higheror
lower,
as maybe required
(Fig.
22).
(3)Setting
Needle
to Shuttle
When the needle has risen
V32"
from the lowest point of its stroke, there
should be a clearance of about
.004",
or
0.1
mm,
between the needle ond
the point of the
shuttle.
This
setting
is
predetermined
by
the
position
of the
shuttle race and cannot be changed
(Fig.
23).
Shuttle
Needle
0,1
mm
Fig. 23 Setting needle to shuttle
The only way adjustment can be made is by exchanging the shuttle race.
Shuttle races
are
available
for this purpose which
ore
.004", .008"
and
.012",
or
0.1, 0.2
and
0.3 mm,
thicker
than
the
standard
shuttle
race.
On
recent machines, this adjustment
can
be
made
by
adding
spacers
of varying
thickness.
(4) Setting
Needle
to Shuttle Driver
In
order
to avoid
that
the point of the shuttle hits the
needle
if the
letter
is deflected by hard spots in the material, the shuttle driver has been design
ed as a
needle
guide. The needle should
bear
lightly
against
the shuttle
driver when the point of the shuttle passes it. If adjustment is required,
bend the shuttle driver coutiously (Fig. 24).
37
To Next Page
Loading...
Need help?
General
