The lockstitch is the mechanical stitch most commonly made by a sewing machine. Most home sewing machines are lockstitch machines, although sergers have entered the home market in the past ten years or so. Of a typical garment factory's sewing machines, half might be lockstitch machines and the other half divided between overlock machines, chain stitch machines, and various other specialized machines.
The lockstitch uses two threads, an upper and a lower. The upper thread runs from a spool kept on a spindle on top of or next to the machine, through a tension mechanism and a retracting arm, and finally through the hole in the needle. The lower thread is wound onto a bobbin, which is inserted into a case in the lower section of the machine. To make one stitch, the machine lowers the needle through the cloth into the lower section, where a hook catches the upper thread at the point just before it goes through the needle. The hook mechanism loops the upper thread entirely around the bobbin case, so that it has made one wrap of the bobbin thread. Then the retracting arm pulls the excess upper thread back to the top of the machine and the feed dogs pull the cloth back one stitch length.
Lockstitch is so named because the two threads, upper and lower, "lock" together in the hole in the fabric through which they pass. Unlike chain stitch, lockstitch does not unravel easily, making it difficult to remove. The term single needle stitching, often found on dress shirt labels, refers to lockstitch, as opposed to chain stitch which unravels easily and is usually used on lower quality garments.
The lockstitch is the mechanical stitch[?] most commonly made by a sewing machine.
Of a typical garment factory's sewing machines, half might be lockstitch machines and the other half divided between overlock[?] machines, chain stitch machines, and various other specialized machines.
Lockstitch is so named because the two threads, upper and lower, "lock" together in the hole in the fabric through which they pass.
A bobbin thread control comprising a bobbin thread pull-off, carried by a rotating lockstitch looptaker to pull bobbin thread from a bobbin after the previous stitch has been set and having a retraction element variable in its rotational position on the looptaker for enabling selective retraction of bobbin thread from the setting stitch.
A lockstitch is formed by concatenation of an upper or needlethread with a lower or bobbin thread.
3,693,565, there is disclosed a lockstitch looptaker with bobbin thread lead beneath the bobbin case, between the bobbin case and the looptaker body, wherein frictional surfaces on the looptaker body periodically engage with the bobbin thread to perform a pull off function.
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