SINGER W1977 - Manual (Page 59)

Section
7
LOWER TENSION
ADJUSTMENT
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 ® .
(D 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 tension is too
loose.
See following page for
adjustment of the bobbin
case.
Once the bobbin case is
correctly adjusted, it is
easy to use the upper ten­
sion to balance the stitches
as shown on page 12.
X Shuttle
y Bobbin and bobbin case
All of them descend with
light resistance._________
Español
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
(1) Quitar el cangrejo.
@ X Cancrejo
y Carrete y bobina
El cangrejo y la bobina se
desplazarán lentamente.