Brother S-710A - 4-10. Lower Thread Detector Mechanism

4. MECHANICAL DESCRIPTIONS
SL-710A
15
4-10.Lower thread detector mechanism
• The lower thread detector mechanism has been designed for materials which do not allow thread jointing or re-sewing
to be carried out when the lower thread runs out.
• The lower thread is detected after the thread is trimmed, and the amount of lower thread remaining is displayed on the
operation panel.
When a thread trimming
si
g
nal is in
p
ut
Potentioleve
r
Shaft of pin driving solenoid
Driving lever
Slide
r
Detect pin
2 Driving leve
r
3 Slide
r
4 Detect pin
(Bobbin case)
1 Shaft of pin
driving solenoid
Amount of lower thread
remaining (%)
Remaining amount
setting value
3 Potentioleve
r
1659M
1658M
1657M