Brother S-710A Service Manual page 18

4. MECHANICAL DESCRIPTIONS
3) Thread trimming complete stop
(1)
Thread trimmer lever
<1>
Thread trimmer lever
4) Thread trimmer safety device
When the movable knife does not return to its original position, the mechanism operates as shown in the illustration
below to move the movable knife to a position where it will not touch the needle.
5
Thread trimmer lever
8
Movable knife
11
<2>
Forked shaft
<3>
Roller block
(3)
Thread trimmer holder
(2)
Thread trimmer
connecting rod
(4)
Movable knife
4
Forked shaft
3
Roller block
7
Thread trimmer holder
6
Thread trimmer connecting rod
<4>
2
Thread trimmer lever
1
Spring
2
Return pin
1
Thread trimmer cam
SL-710A
4
Solenoid
plunger
3
Solenoid lever
Roller
1641M
1642M