PARTS OF SEWING MACHINE
Parts and functions of a sewing machine are listed below (Figure 8.1).
Spool pin is a small metal rod on the body of the sewing machine. The main function of spool pin is to hold the spool of thread (Figure 8.2).
Thread guide is a small metal ring, on the face of sewing machine. It keeps the thread in position and guides the thread from the spool to the needle.
Tension disc is a metal spring with con-cave disc and screw. The thread is fed into the tension disc in between the two con-cave disc, screw and spring to pass the thread freely to the needle. The screw can be adjusted to increase or decrease the tension (Figure 8.3).
Take up lever is, hook shaped and the thread is passed through this to make upward and downward position, to pull thread in the sewing machine and to enable the needle to stitch.
Needle bar is a steel rod to hold the needle at one end with help of a clamp.
Bobbin case is a metal circular cap shaped part which holds the bobbin. The upward thread helps to bring the lower thread in the bobbin from the bobbin case to make a stitch (Figure 8.4).
Presser foot is a heavy fork shaped steel rod which is attached to the presser bar. Presser foot holds the fabrics in the place while sewing (Figure 8.5).
Presser foot lifter is a lever attached to the presser bar. It is controlled by the presser foot and helps in raising and lowering the presser foot.
Stitch regulator is a small vertical bar with markings and has a knob. It controls the length of the stitch on the fabric.
Bobbin winder is a small rod in the front side of the wheel. It is used to wind thread and it controls the bobbin while winding thread. Bobbin winding should be carried out in medium speed. Increase in speed will result in stretching of the sewing thread which may result into breakage (Figure 8.6).
Fly wheel is a circular metal ring which helps the movement of the machine. It can be rotated manually or by power. It low-ers and raises the sewing machine needle (Figure 8.7).
Clutch or thumb screw is attached in the middle of fly wheel. If the screw is removed the machine will not work. Thumb screw controls stitching.
This is a rectangular metal plate. It can be moved to insert and remove the bobbin.
It is a semi circular metal plate with a small hole through which the needle passes through. The needle enters inside the hole and picks the bobbin thread (Figure 8.8).
The feed dog is a set of metal teeth. The feed dog helps the fabric to move after each stitch (Figure 8.9).
Face plate is a metal plate covering the needle bar, presser bar and take up lever. It covers these parts and prevents them from dust (Figure 8.10).
It is made up of iron. It is pressed by foot to give pressure for the work of sewing machine. Pedal is found in leg operating machines which is connected to fly wheel through a belt.