Parts of sewing machine

• Spool pin is fitted on top of the arm to hold the reel 
• Thread guide it holds the thread in position from the spool to the needle
• Tension disc the two concave disc put together with the convex sides facing each other the thread passes between the two the tension of the thread is adjusted by a spring and not which increases or decreases pressure
• Take up lever it is a levered fitted to the body of the arm it's up and down motion feeds the thread to the needle and tightens the group formed by the shuttle
• Needle bar this is a steel rod to hold the needle at one end with the help of a clamp its main function is to give motion to the needle
• Bobbin case this moves into position to catch the top thread and from the stitch as the needle is lowered into the bobbin chamber
• Presser foot it is a fixed to the presser bar to hold the cloth firmly in the position when lowered
• Presser foot lifter and lever attached to the presser bar for raising and lowering the presser foot
• Stitch regulator this controls the length of the stitch
• Bobbin winder a simple mechanism used for winding thread on the bobbin
• Flywheel when this is made to revolve it works the mechanism of the motion
• Clutch or thumb screw this is the center of the flywheel and engages and disengages the stitch mechanism
• Slide plate a rectangular plate which facilitates the removal of the bobbin case without lifting the machine
• Needle plate or throat plate a semicircular disc with a hole to allow the needle to pass through it
• Feed dog this consists of the sets of teeth fitted below the needle plate it helps to move the cloth forward while sewing
• Faceplate a cover which on removal gives access to the oiling points on the needle bar presser bar and take up level
• Spool pin for bobbin winding spool of thread is placed on this at the time of bobbin winding