
© ANITA
MP03700EN_181101
9
3. OPTIONAL PARTS
Upper thread tension assembly:
The following types of upper thread tension assembly are available for use with different thread
take-up spring types and different thread tension spring strengths.
Part code
Thread tension spring type
Thread take-up spring strength
B4-177B
Standard
Double
B4-177B(A)
Weak
B4-177B(B)
Very weak
*Standard part at time of shipment GF-2207-147, GF-2210-147, GF-2207-447 and GF-2210-447.
(Reference)
Tension spring force (when spring height 12mm)
Standard
Approx.49N (Approx.5kgf)
Weak
Approx.17.64N (Approx.1.8kgf)
Very weak
Approx.2.94N (Approx.0.3kgf)
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