In
order
to
ovoid
that
the
stitch
length
setting
will
be
disturbed
while
sewing,
stitch
length
control
n has
been
provided
with
a
locking
device
in
the
form
of
disc
o
(Fig.
6).
This
disc
must
be
pressed
back
slightly
when
setting
the
stitch
length.
Finger-tip control p serves to reverse the direction of feed and is used for
bock-
tacking.
When
lever
p
is
pressed
down,
the
machine
sews
in
reverse,
making
stitches of the length set.
When
lever
p
is
released,
the
direction
of
feed
is
instantly
reversed
by
spring
actionand the
machine
resumes
forward
stitching.
If
desired,
the
machine
will
be
fitted
with
a
small
treadle
for
switching
from
forword to backward sewing.
Upon
special
request,
the
Pfaff
463
high-speed
seamer can be
fitted
with
a
stitch
length
limiting
device
for
backward
sewing
if a shorter
backward
stitch
is
desired
for
backtacking
the
ends
of
seams.
The
length
of
reverse
stitches
is
then
limited
by
turning
in
grub
screw
Sof
crank
R
on
shaft
L
(Fig.
10).
7. Lifting the Presser Bar
Since
the arm standard of the
new
high-speed seamer has been set closer to
the
rear
edge
of
the
bed
plate,
it
was
possible
to
enclose
the
presser
bar
lifting
mechonism
in the machine arm so that it isnot visible on the outside.
To mount the knee lever, push it over the lower end of vertical shaft r under
the
tabletop.
The
lever
is
held
in
place
by
angular
bracket
s
which
snaps
into
place
ofter
tronsverse
driving
pin
u
has
entered
the
cutouts
t
in
the
right-angled
coupling sleeve q
(Fig.
7).
When
the
coupling
sleeve
is
pushed
onto
the
end
of the
shaft,
resilient
bracket
s
must
be
compressed
to open it
slightly.
Motion
is
transmitted
from
the
vertical
shaft
to the
presser
foot
by
means
of a
crank,
a
connection
and a
bellcrank
lever
which
raises
the
presser
foot.
A
small
hond
lever
Cat the
back
of the
machine
serves
to
lock
the
presser
foot
in
its
highest
position.
This
lever
is
flicked
to the
left
to
retain
the
presser
foot
after it has been raised by knee action
(Fig.
9).
10
To Next Page
Loading...
Need help?
General
