Tension Release And Presser Foot Mechanism (Other Than Premier Specifications) - Brother S-7300A Service Manual

4. MECHANICAL DESCRIPTIONS
4-6. Tension release and presser foot mechanism
(Other than premier specifications)
<Other than premier
specifications>
When the thread trimming signal turns off,
parts such as the tension release wire [2]
return to their original positions.
When the presser foot 12 is lowered, the
presser bar lifter lever spring (1)
causes the tension release plate <10> to
return.
(Presser foot is raised using the
knee lifter plate assembly)
1. Knee lifter plate assembly
2. Knee lifter lever D
3. Knee lifter connecting rod
4. Knee lifter F
5. Knee lifter R
6. Knee lifter bar
7. Knee lifter lever D
8. Knee lifter connecting rod
9. Presser bar lifter lever
10. Lifting plate
11. Presser bar
12. Presser foot (Raised)
(1) Presser bar lifter lever spring
47
(Presser foot is raised using the
lifting lever)
<1> Presser bar lifter lever
<10> Tension release plate
<11> Tension release stud assembly
<12> Tension release pin
<13> Tension disc presser
<14> Tension disc (Lifts up)
S-7300A
1214D
(Thread trimming signal is input)
[1] Thread trimmer solenoid
[2] Tension release wire