Singer 101 Series - Page 19

Speed
Controller.
The speed
control
box (rheostat)
is
at the left side of the table
directly
back Of knee
lever H (Fig.
32) and is connected
to plugs
F and G (Fig. 33)
by the wires
running
to the left in Fig.
33. If the
controller fails
to vary the
speed, examine connections J and
K
(Fig. 34) for any
defects,
which would cause a short
circuit.
FIG.
If the controller does not give five
distinct speeds, examine
the marking on the resistance unit N (Fig.
35) and make sure
that it corresponds
to that on the motor
nameplate B (Fig.
20,
page 25). If both are marked the
same remove the resistance
unit and insert a new one. If the machine
then Operates
at all
speeds, return the first resistance unit to the factory for
inspection.
FIG. 35.
SHOWING
If the
machine continues
to run
after pressure
has
been
taken
from
the knee control
lever, the fibre
portion
of
the control
con-
tact lever
(C) may
be binding.
This occasionally
happens
owing
to the
humidity
in the atmosphere
which
sometimes
causes
the
fibre portion
of the control contact
lever
(C)
to
swell and
conse-
quently bind. Note
the following
remedy:
FIG.
SPEED CONTROLLER
WITH FIBRE
BLOCK
Unscrew
the
nut (A) which
holds the contact
lever (C) on the
pivot stud,
take
off the
contact lever and
scrape about the thick-
ness
of an ordinary
piece of
paper the
upper surface
(B) of the
fibre,
being careful
to scrape
the
surface evenly so as
to keep it
flat. The
control contact
lever
will then swing
freely on
the
pivot stud.
34
located
34. SHOWING CONTROLLER
CONNECTIONS
CONTROLLER RESISTANCE
35
36.
off