Page 113
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Section
7
LOWER TENSIION
If you machine skips stitches or
loops stitches, it may require a
tension adjustment. To check the
bobbin tension, follow these
steps:
Push latches of the shuttle
race cover to the outside, as
shown in figure .
Remove shuttle cover as
shown in figure .
Remove shuttle as shown in
figure .
Suspend bobbin, bobbin
case, and shuttle all together
as illustrated in figure .
When jerking the thread
slightly. all of them should
slide down with light resis-
tance .
If they do not slide down with
a slight jerk of the thread, the
bobbin case tension is too
tight. If they slide down too
easily, the bobbin case ten-
sion is too loose.
See following page for adjust-
ment of the bobbin case.
Once the bobbin case is cor-
rectly adjusted, it is easy to
use the upper tension to bal-
ance the stitches as shown
on page 27.
x Shuttle
y Bobbin and bobbin case
All of them descend with
light resistance.
AJUSTE DE TENSIÓN DE
LA BOBINA
Si la máquina pierde puntos o
hace nudos por el revés en la
costura no es problema de la
máquina, sino de la tensión.
Para verificar la tensión de la
bobina, se debe tomar ésta y
el cangrejo como se indica en
el dibujo, si la tensión es cor-
recta se desplazarán lenta-
mente.
Después ajustar la tensión
superior con los número 4, 5,
o 6.
Girar los seguros hacia
afuera.
Quitar la tapa del cangrejo
Quitar el cangrejo.
x Cancrejo
y Carrete y bobina
El cangrejo y la bobina se
desplazarán lentamente.
