To Start the Machine
Turn on the electric current and press the knee
lever (K, Fig.
8, page 7) to the right.
As the pressure on the knee lever is in-
creased, the speed of the machine is increased, the speed being
controlled entirely by the amount of pressure on the knee lever.
Speed
The
motor, at full speed,
should drive the sewing machine
at a speed
of not less than 900 stitches per minute.
If the sewing machine has not
been
run for some time, the
speed may be lower until the
lubricant has thoroughly
covered
all
of the bearings. Run the machine a few minutes with the
presser
foot raised, and without being
threaded, and the machine
will quickly
attain its full speed, provided
no other trouble
exists.
If, after running the machine a few
minutes, the
speed is
still below 900,
it may be due to any
one of the following reasons:
Location
of Motor Troubles
Speed of Machine Too Slow
1. See
if the round-head brass screw is in the correct hole in
the terminal plate at the back of the motor. Operating the
motor
on alternating current with
the screw in the hole marked “D"
will cause the motor to
run slow.
2. See that the round-head
brass screw is firmly fastened in
position (either
at D or A). If this screw is loose, the motor will
run slow.
Be sure that the thread of the screw is not stripped,
as this will make it impossible
to tighten the screw firmly. In
this case put in a new
screw.
3. Ascertain if the voltage of the circuit corresponds with
that stamped
on the motor name plate. If the motor is run on a
lower voltage than that stamped on the name plate, the speed
of the motor will be too slow.
4. When the motor is used on alternating
current, see if the
number of cycles of the circuit corresponds
with that stamped on
the motor name plate. A 50 cycle
motor will run slow
on a 60
cycle circuit.
Speed of Machine Too
5. Remove the cloth plate as instructed on page 20,
and
observe
whether the contact finger (T3, Fig. 10, page 11) of the controller
bears firmly on the contact buttons
and that it makes a good
connection with the contact button (V3, Fig. 10) when the knee
lever
is pressed as far to the right as it will go. If it does, the
trouble
is not in the controller.
6. See that the two sockets (I and J, Fig. 7, page 7) fit tightly
on the two connectors
on the underside of the bed of the machine,
and that the
terminal block (G, Fig. 6, page 6) fits tightly on
the
two connectors underneath the table. If the sockets or
terminal
block fit loosely, slightly spread apart the two prongs
of each connector, so as to make them fit tightly in the sockets
terminal block.
7. Too much pressure on the presser foot will retard the
speed of the machine. The pressure
on the presser foot should
be adjusted to be light as possible
without interfering with the
feeding of the material.
8. See that there is no carbon
or grease on the commutator
of the motor or
that the commutator is not rough, causing the
motor to run slow. (Instructions for disassembling the motor are
given on pages
12 and 13). The carbon can be easily removed
with a rubber eraser.
9. Binding gears may cause the motor to run slow. Loosen
the screw (K3, Fig. 24, page 27) at the front of the upright part
of the arm which holds the motor frame in the machine. With
the knee lever held at full-speed position, turn the motor frame
slightly in each direction and note whether there is any increase
in speed. If there is, turn the motor frame
to the point where
the speed is
highest, then firmly tighten
the screw
(K3).
10. If none of these remedies prove to be effective, return the
machine to the factory.
Speed
of Machine Too Fast
This may be due to the following:
1. See if the round-head brass screw is in the correct hole in
the terminal plate at the back of the motor. Operating the motor
on direct current
with the screw
in the hole marked “A” will
cause the motor to run too fast.
2. Ascertain if the voltage of the circuit corresponds
with
that stamped on the motor name plate. If the motor is run on
8
9
Slow—Continued
"or
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