Upper Thread Breaks - English
Page 1
... oiled o Clean excess oil from rotary hook • Needle bar(s) over oiled o Clean excess oil from needle bar(s) • Bobbin thread is not wound correctly o Replace bobbin • Bobbin case is damaged o Change bobbin case • Scratches on the sliding surface of the rotary hook o Smooth scratches or replace rotary hook • Poor quality...
... oiled o Clean excess oil from rotary hook • Needle bar(s) over oiled o Clean excess oil from needle bar(s) • Bobbin thread is not wound correctly o Replace bobbin • Bobbin case is damaged o Change bobbin case • Scratches on the sliding surface of the rotary hook o Smooth scratches or replace rotary hook • Poor quality...