Lower Thread Detector Mechanism - Brother S-710A Service Manual

4. MECHANICAL DESCRIPTIONS

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
signal is input
1
Shaft of pin
driving solenoid
3
Potentiolever
1657M
Detect pin
15
(Bobbin case)
4
Detect pin
3
Slider
2
Driving lever
SL-710A
Amount of lower thread
remaining (%)
Slider
Driving lever
Shaft of pin driving solenoid
Potentiolever
1658M
Remaining amount
setting value
1659M