Page 221 - CTS - Sewing Technology - TP - Volume - 2-0

SEWING TECHNOLOGY - CITS

EXERCISE 36 : Special Sewing Machines

General sewing - Single needle lock stitch machine
At the end of this exercise you shall be able to
• identify the major parts of Single needle lock stitch machine and their function.
• learn the function of different machine parts.
• follow the steps to operate the SNLS machine.

Procedure

Features of single needle lock stitch machine
Single needle lock stitch machine is mostly used as an industrial sewing machine. Modern single needle lockstitch
has a thread trimmer which operates at the highest speed of its kind. Lockstitch machine is the most commonly
used sewing machine in the apparel industry, especially in woven garments.
Types of lock stitch sewing machine

There are two types of lock stitch sewing machine used in a garments factory.
1 Single needle lockstitch machine
2 Double(two) needle lockstitch machine
Single Needle Lock Stitch Machine Single needle lock stitch machine is stitch by one needle of a machine by lock
stitch.
Double Needle Lock Stitch Machine Double-needle /twin/two needle is a needle with a single shank and two
shafts, proceed stitching with the double stitching you will get two parallel rows on the face of the fabric and a
zig-zag stitch on the back of the fabric.

Different parts of SNLS sewing machine (Fig 1) • Thread density tensioner
• Feed dog arm • Stitch density regulator
• Feed Dog • Back stitch lever

• Needle Plate • Gear
• Throat Plate • Pinion
• Pressure foot • Main shaft
• Pressure foot bar • Pump shaft
• Pressure regulator • Feed dog driven shaft

• Pressure spring • Hook Shaft
• Hand Lifting • Feed dog arm shaft
• Leg lifter • Rotary hook
• Wait cam • Bobbin

• Thread take-up lever • Bobbin case
• Connecting rod • Hook finger
• Needle bar • Oil pump
• Needle

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