Common problems of sewing machine and their remedies?

sewing machine troubles,causes & remedies -

The different parts of the sewing machine and its functions are the following:

1. Spool pin - holds the spool of thread
2. Presser foot - holds fabric in place while sewing
3. Thread guide - keeps the thread in the correct position
4. Upper tension regulator - regulates the tightness and looseness of the thread
5. Stitch regulator -regulates the length of stitches
6. Thread take-up lever - moves the thread up and down
7. Needle clamp - holds the needle
8. Presser bar lifter - lowers and raises the presser foot
9. Feed dog - moves the fabric as sewing goes on
10. Balance wheel - the wheel on the right side of the head which controls the movement of the needle
11. Bobbin winder - used to wind thread on the bobbin
12. Belt - connects the balance wheel and the drive wheel
13. Drive wheel - the big wheel below the machine that is connected to the treadle
14. Treadle - the place for the feet
15. Bed - the flat base of the head which rest in the cabinet
16. Throat plate - the metal plate that covers the feed dog
17. Dress guard - it is located where the drive wheel is, to protect the dress of the sewer when the machine is moving.