Study on overlock sewing machine.

 Name of the experiment: Study on overlock sewing machine.

Introduction:

Over lock, sewing is used to form over lock stitch. It is used for knitted and woven fabric. Side seam, armhole, the sleeve of the shirt and inseam and side seam of pant also done by over lock stitch machine. Over lock sewing machines usually run at high speeds, from 1000 to over 9000 rpm, and most are used in industry for edging, hemming and seaming a variety of fabrics and products. Over lock, stitches are extremely versatile, as they can be used for decoration, reinforcement, or construction.

Machine specification:

Name: Over-lock sewing machine

Brand name: JUKEI
Model: JUK 7471
Origin: China
Function: Any fabric side lock

Machine Parts Name:
1) Thread stand: There is four thread stand which holds the bobbin.
2) Thread guide: Which indicates the way of the thread.
3) Four thread tension post: Two-needle and two looper thread tension post. This ensures the tension of the thread.
4) Needle thread take-up lever: To hold the needle thread.
5) Looper thread take-up lever: To hold the looper thread and easy to pass.
6) Presser foot: To press the fabric surface.
7) Throat plate: Help the fabric to move forward.
8) Feed dogs: To move the fabric to move forward by a distance.
9) Upper/ lower looper: To help the fabric sewing.
10) Upper and lower knife: To cut the fabric edge.
11) Stitch controller: To control the length of stitch.
12) Foot pedal: To control the speed.
13) Hand wheel: To raise and lower the needle.


Other Information:
1) Machine R.M.P=2850
2) Power = 250 watt
3) Voltage = 220V
4) HP= 3/4 HP

Working principle:
1) At first, we keep the bobbin on the thread stand.
2) Then we passed the four thread according to their passing path.
3) We also maintain the thread tension.
4) We set up the machine properly and also ensure that thread pass through the needle.
5) Then we power on the machine for sewing a fabric.
6) At last, we over-locked some fabric.

Sample Attachment:

                                              

Precaution:
1) We should maintain proper speed pressing the foot pedal correctly.
2) We should keep distance our hand and finger from the needle during work with sewing machine operation.