Study on single needle lock stitch machine.

Experiment No: 05

Experiment Name: Study on single needle lock stitch machine.

Introduction:

A sewing machine is a textile machine use to stitch fabric or other material together with thread. Sewing machine were invented during the first industrial revolution to decrease the amount of manual sewing work performed in clothing companies. The industrial lock stitch sewing machine is generally one needle machine but two needle machine is also used. Various type of feed mechanism are found with lock stitch sewing machine. The sewing speed of various types of lock stitch and of various companies are different. The sewing speed means making of stitches per minute that means SPM (Stitches per minute).

Objectives:-

1. To obtain a clear knowledge a particular action of different parts of single need lock stitch sewing machine.
2. To clearly observe the mechanism construction parts of lock stitch sewing machine.

Figure:-

Main parts:-

1. Machine bed.
2. Bobbin case.
3. Feed dog.
4. Presser foot.
5. Foot peadet.
6. Needle. 
7. Pressure foot level. 
8. Reverse level.
9. Spool pin.
10. Stitch length regulator. 
11. Thread guide. 
12. thread tension. 
13. Throat plate.
14. Needle plate.
15. Handle wheel. 
16. Needle bar.
17. Pressure foot bar.
18. Take up lever.

Parts of sewing machine:-

1. Spool pin:- It is fitted on top of the arm to hold the reel.
2. Thread guide:- It holds the thread in position from the spool to the needle.
3. Thread disc:- The two concave disc put together with the convex sides facing each other. The thread passes between the two.
4. Take up lever:- It is a lever fitted to the body of the arm. Its ups and down motion feed the thread to the needle.
5. Needle bar:- This is a steel red to hold the needle at one end with the help at clamp.
6. Bobbin case:- This moves onto positions to catch the top thread and form the stitch.
7. Pressure foot:- It is fixed to the pressure bar to hold the cloth firmly in position when lowered.
8. Stitch regulator:- This control the length of the stitch.
9. Slide plate:- A rectangular plate which facilities the removal at the bobbin case.
10. Needle plate:-  A semi circular disc with a hole of allow the needle to pass through it.
11. Feed dog:-  This consists of a set of teeth fitted blow the needle plate. It helps to move cloth forward while sewing.
12. Face plate:- A cover which on removal gives access to the oilling points on the needle bar, presser bar and take up lever.

Features of single needle lock stitch sewing machine:-

1. Lock stitch is formed by single needle of a plain sewing machine.
2. The speed of a lock stitch sewing is up to 6000 rpm.
3. During stitch formation; the needle thread is interlaced with the bobbin thread by means of a hook.
4. Lock stitch machine can be distinguished by the winding device provided for bobbin thread.
5. Programmable plain fewing machine is used for few respective operation.

Conclusion:

The lock stitch which is used in most modern machine is formed from a single thread by this experiment we able to know about the part if a single needle lock stitch sewing machine will be useful for the future.