principles of machine operation

There are some key steps that need to be kept in mind for the preparation and operation of the sewing machine.

Preparation of a single needle sewing machine

Before starting the operation process in a single needle sewing machine, an Operator should be aware of every aspect relating to the sewing machine. This includes the problems one may be faced with while working too, so that they may be rectified by the Operator or can be reported to one’s supervisor. The steps for preparing a sewing machine for stitching are listed below.

(a) Connect the machine to the power supply

(b) Placement of foot control

(d) Wind the bobbin

(e) Select the correct needle and thread for sewing

(f) Fix the needle into needle bar

(g) Set the bobbin and bobbin case in the machine

Thread the machine

(i) Adjust the thread tension

(j) Adjust the stitch length

(k) Check the stitch formation

(l) Check the reverse stitching lever

Threading the Bobbin and Needle

1. Wind the bobbin.

· Disconnect the movement of the needle by loosening the stop motion screw which is found on the balance wheel.

· To wind the bobbin with the thread, place the bobbin spool on the bobbin winder fitted on the top.

· Wrap the thread from the reel placed in the thread spool around the bobbin.

· Press the treadle/foot control or turn the hand wheel to start winding.

· The winding in the bobbin should be uniform.

· Once the bobbin is sufficiently filled with thread, stop winding and remove the bobbin.

2. Threading the bobbin. Once the bobbin is threaded, you will need to load it into the bobbin case below your needle.

· Place the bobbin into the bobbin case

· Pull thread through the slit and under the tension spring. when thread is pulled through the slit downwards from left to right the bobbin runs clockwise.

· Place the bobbin casein the shuttle with the hook pointing upwards.

· Press it in until the hook is clicked in position.

3. Thread the top parts of your machine. After your bobbin is in place, you will need to guide your thread through the top area of your machine. The position of thread guides varies according to different machines but basically the threading is the same. To do this;

· Place the thread on the larger spool pin located on the top of your machine.

· The thread from the spool pin is taken through a guide to the tension.

· It is passed between the tension disk and then to the thread take up lever.

· It is then pulled through the guide to the needle.

· The needle is threaded from the direction of the last guide according to the machine instructions.

4. Bringing the bobbin thread up.

· Hold the needle thread with one hand

· Turn the balance wheel gently with the other hand to lower the needle. The needle thread picks up bobbin thread in form of a loop

· Pull the looped thread out so that the two threads are on top

· Put both threads to the back of the machine before starting to machine