38
Order
5
6
7
Failure Status
Skip of sewing point
Failure Cause
Using bent needle
Using improper needle comparing to
using thread
Defective needle mounting
Improper needle and hook timing
Weak upper thread tension
Weak lower thread tension
Improper needle and hook timing
Defective location of thread cutting cam
Interval of groove on needle and hook
point is too large.
Excessive spring tension and operation
of thread take-up spring
Exchange tension of mobile mess and
fixed mess is relaxed.
Abrasion of groove on knife part of
mobile mess and fixed mess.
Needle replacement
Needle replacement
Needle remounting
Readjustment of needle and hook timing
Upper thread tension adjustment
Lower thread tension adjustment
Readjustment of needle and hook timing
Readjustment of thread cutting cam location
Readjustment of needle bottom dead point
Adjustment of thread take-up spring tension
and operation
Tension adjustment of fixed mess
Replacement of mobile mess and fixed
mess
Actions
Defective Thread Jointing
Status
Occurrence of thread
Cutting mistake
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