Page 174 - CTS - Sewing Technology - TP - Volume - 2-0
P. 174
SEWING TECHNOLOGY - CITS
Four thread overedge
For over edge seams requiring greater seam security a four thread version of stitch type 504 is used. There are
three, four thread over edge stitch types.
Stitch type 512 is known as four thread mock safety because the upper side of the stitch type resembles the
upper side of stitch type 516 which is an overedge true safety stitch. Stitch type 512 is also known as four thread
overedge, half cover.
The second overedge stitch type is Stitch type 514. This is known as four thread overedge, full cover. This is
because the top looper extends its thread to the left hand sewing needle whereas stitch type 512 only extends its
upper looper thread to the right hand sewing needle.
Stitch 512 (Fig 10)
Fig 10
Stitch 514 (Fig 11)
Fig 11
The third of these stitch types is Stitch type 515. (Fig 12)
515 - Four thread safety stitch
This stitch type is formed simultaneously using one row of stitch type 401 and one row of 503.
Fig 12
159
CITS : Apparel - Sewing Technology - Exercise 34 CITS : Apparel - Sewing Technology - Exercise 34
