1-12
S-104-100
Revised 09/2004
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PRINCIPLES OF SEWING
A stitch is the unit of thread formed in the production of seams and stitching.
Stitching is defined as a series of stitches embodied in a material for ornamental purposes, for finishing an
edge, or both.
The type of stitch used in the eyelet buttonhole machine is a two-thread, chain lock, purl stitch enveloping
a reinforcing cord. When the thread, loopers, and spreaders create a buttonhole:
The needle lifts up and forms a loop. The looper carrier moves to the right and the left-hand looper enters
the loop formed.
L.H. Spreader
Needle
Throat plate
Lower thread
Upper thread
Cord
R.H. Spreader
R.H.
Looper
Reinforcing cord
Upper thread
R.H. Spreader
Needle
R.H. Looper
Looper carrier
Throat plate
L.H. Looper
Lower thread
L.H. Spreader