Sewing Machine & Practice
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मशीन सबसे बुनियादी से लेकर इलेक्ट्रॉनिक मशीनों तक सिंपल लॉक स्टिच है जो उन्नत कंप्यूटर प्रौद्योगिकी का उपयोग करती है,ion |
Chapter 6
Parts of Sewing Machine It is important for the beginner to know and recognize the di erent parts of the sewing machine. Arm: The horizontal upper part of the head which has the mechanism for handling upper thread and driving the needle. Back Stitch Lever: A lever located at the lower right hand side of the machine and its basic function is to form the stitches in reverse direction. Bed: The lower portion of the machine i.e. stands under which the mechanism for handling lower thread including the shuttle and feed are mounted. Bobbin: A small metal / Plastic spool that holds the lower thread supply. Bobbin Case: The metal case that holds the bobbin. It has the tension spring that controls the pressure on the bobbin thread. Bobbin Winder: It is a simple mechanism for winding the thread on the bobbin and is located at the right hand side near the wheel. Feed Dog: A small metal device under the presser foot which has teeth which carries the material along as it is stitched. It moves the material forward, by one stitch length, after each stitch has been drawn. Hand Wheel: Handel is located on the right side of the machine. It is driven by hand or belt in the domestic machine and with the help of belt in the industrial machine. It controls the movement of the needle bar and drives the machine. Hand Lifter: To lift the presser foot by hand. Head: The upper part of the machine above the stand. It is a complete sewing machine without the bed.
Sewing Machine & Practice
SEWING MACHINE Sewing Machine is an important piece of sewing equipment. There are several machines in the market, each with its own desirable features and advantages.
Machine ranges from most basic which having only simple lock stitch to the electronic machines that uses advanced computer technology, have various functions for example piping, binding, ru es, pleating, darning, hemming and even makes button holes and attaches fasteners. A basic requirement of any machine is a precisely timed movement of the needle and shuttle to manipulate thread from top and bottom to form a stitch. The presser foot in the machine holds the fabric in place and pushes in front for formation of seam. Lock stitch Machine The single needle lock stitch is the most used machine in the industry globally. The chain stitch machines and over edge machines are generally used for knits. A basic understanding of how the machine operates will enable you to use any machine e ciently and correct stitching defects. The simple lock stitch machine is also called a at bed machine and it makes only straight stitches. The stitch looks same from both the sides it is absolutely at, most supple, and completely secure and is the least conspicuous stitch. If it breaks during use it does not open up because the two threads are locked together. This is the reason why it is also called a lockstitch.The lockstitch is formed with the needle thread that feeds from a spool at the top and a bobbin thread that feeds from a bobbin at the bottom. When formed correctly, the amount of thread used from the top and bottom is equal and the threads lock in the centre of the fabric. Types of Lockstitch Machines If we broadly classify there are two types of
lockstitch machines. The lockstitch power machine is similar to lockstitch home sewing machine. However, there are some important di erences: 1 The power machine is much faster. It stitches an average of 5000 stitches per minute. Whereas an average home machine stitches no more than 800 stitches and a hand sewing machine would stitch a maximum of 300 stitches per minute. 2 The presser foot in a power machine is controlled with a knee lift but in a home sewing machine it is operated manually using a lever at the back of needle bar. 3 The throat plate in a home sewing machine is often marked with seam guides which are not there on industry machines. 4 In the industrial sewing machine or power machine the presser foot has a narrow opening between the two toes and it holds fabric more securely and rmly. 5 The industrial sewing machine or power machine has a small and round needle hole on the throat plate than the home sewing machine, which is large and oval. This reduces stitching problems
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