Brother S-7300A Service Manual page 54

4. MECHANICAL DESCRIPTIONS
2) Rocking of movable knife holder
<Other than premier specifications>
1210D
1. Thread trimmer cam
2. Roller
3. Slide block
4. Forked shaft
5. Thread trimmer lever
6. Movable knife connecting rod
7. Movable knife holder
8. Movable knife
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<Premier specifications>
1. Thread trimmer cam
2. Roller
3. Slide block
4. Forked shaft
5. Thread trimmer lever
6. Upper knife
connecting rod
7. Upper knife holder
8. Upper knife
S-7300A
1209D
1041D
<6> Lower knife
connecting rod
<7> Lower knife holder
<8> Lower knife