SINGLE NEEDLE LOCKSTITCH MACHINE PDF

The change is driven by digitalization. Until recently, sewing machines have been adjusted by human ope rators based on personal hunches and experience. It helps improve the work efficiency through operator assistance with its audio guidance. Energy-saving servomotor is installed in the direct-drive style.

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Clothing Industry. Single needle lockstitch machine: These kinds of sewing machines are generally used for sewing fabric, leather, etc. Figure-1 shows the single needle lock stitch machine. The one side of the needle has the eye and a sharp tip while the other side is attached to a needle bar that moves up and down to form a stitch.

The arm also secures a presser foot which presses the fabric while sewing. The needle penetrates into the fabric from the top, to bring the needle thread through the fabric to the bottom to form a stitch.

Figure Single needle lockstitch machine The needle thread in a spool is threaded through the thread guides, tensioning mechanism and into the sewing needle eye. The bottom thread bobbin thread is wound onto the small package called a bobbin before sewing and is secured inside a bobbin case. For stitch formation, the needle brings the needle thread loop to the bottom of the fabric where a small hook on the bobbin case catches it. As the bobbin hook rotates, it takes the needle thread around the bobbin to produce a stitch and then the take-up lever takes back the extra loop of top thread to tighten the stitch.

As the needle is out of action of fabric, the feed dog comes above the throat plate, and pushes or moves the fabric up against the presser foot for next stitch. Working principle of Single needle lockstitch sewing machine: 1.

The single needle lockstitch sewing machine is getting drive from the electric motor which is mounted in sewing table. The main parts of the sewing machine are flywheel, eccentric or cam, needle bar, bobbin holder, feed dog and presser foot.

The flywheel is driven by motor belt and it drives the sewing machine main shaft. Figure Needle bar and Pressure foot mechanism 3.

The every rotation of the main shaft moves the needle a full cycle of up and down movements. The main shaft is further connected with a bevel gear and two connecting rods to transfer the motion to the bottom of the machine. The bevel gear rod is used to transfer the motion to the bottom centre shaft, which is the main shaft for connecting the bobbin shuttle mechanism. This connection helps the bobbin shuttle to move. The bevel gear mechanism helps to transfer the motion without any energy loss shown in Figure Figure Motion transfer from main shaft to bottom shaft 5.

Every one revolution of the main shaft is connected to the every revolution of shuttle hook to make one unit stitch. The other two connecting rods from main shaft are used to connect with the feed dog, which has a synchronized movement with needle and bobbin shuttle mechanism.

The feed dog has to perform four stop motions for every cycle of stitch formation. The feed dog gets drive from main shaft in two ways, one is rotation — to deliver the unit length of the fabric for sewing and another motion is the up and down movements above the throat plate of the sewing machine.

In Figure-4, the rod 1 helps the feed dog to move up and down for the selected distance based on the settings kept. The rod 2 is used to move the feed dog to and fro as required.

Figure Bottom main shaft and mechanism. When ever, the stitch regulator is adjusted, the feed dog delivers the required amount of fabric needed by adjusting the feed bracket as shown in Figure The revolution per minute of the feed dog is same as the needle stroke.

Figure Feed dog movement from bottom shaft connection All these motions work together from the single motion of main shaft and help the machine to form the stitch. Share This:. Email This BlogThis! Labels: Sewing Machine. Newer Post Older Post Home. Search This Blog. Popular Posts. Sewing Machine Parts and Functions with Pictures. There are different types of machine and equipments are used to manufacture garments. Among them sewing machine plays an important role in A n important aspect of quality assurance is to match products with suitable factories.

New factories trying to build up their customer ba How Should a Bra Fit Properly. Fit may be one of the things that got you interested in making bras in the first place. We all know what a great fitting bra feels like; Finishing of Denim Fabric. Denim fabric is courser than as usual woven fabri Setting Up of a Garment Industry: I have got many emails asking 'how to start garment business in small scale' and many other ques Figure Single needle lockstitch machine.

Figure Needle bar and Pressure foot mechanism. Figure Motion transfer from main shaft to bottom shaft. Figure Feed dog movement from bottom shaft connection.

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Know Your Single Needle Lockstitch Machine – Easing Sewing Operations

Textile Course. Online textile learning platform. I ntroduction: A lockstitch is the most common mechanical stitch made by a sewing machine. The term "single needle stitching", often found on dress shirt labels, refers to lockstitch.

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Lockstitch

A lockstitch is the most common mechanical stitch made by a sewing machine. The term "single needle stitching", often found on dress shirt labels, refers to lockstitch. The lockstitch uses two threads , an upper and a lower. Lockstitch is named because the two threads, upper and lower, "lock" entwine together in the hole in the fabric which they pass through.

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