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The unwind stage holds the roll stably and allows it to spin; it is either braked or driven to maintain accurate tension in the material. Some machines have a driven unwind which reduces the effect of inertia when starting to unwind heavy rolls or when the material is very tension-sensitive. The slitting section has four main options:
To make one stitch, the machine lowers the threaded needle through the cloth into the bobbin area, where a rotating hook (or other hooking mechanism) catches the upper thread at the point just after it goes through the needle. The hook mechanism carries the upper thread entirely around the bobbin case so that it has made one wrap of the bobbin ...
Toilet-tissue winders are able to change over at running speed, while paper and board winders need to stop the winding process in order to cut the sheet and glue the paper on to a new wind-up core. Top-line winders introduce the paper core through a maintenance pit downstairs, with web interruption time as low as 15 seconds.
Sailmaker's stitch – may refer to any of the hand stitches used for stitching canvas sails, including the flat stitch, round stitch, baseball stitch, herringbone stitch. [2] Slip stitch – form of blind stitch for fastening two pieces of fabric together from the right side without the thread showing
The rotary hook or rotating hook is a bobbin driver design used in lockstitch sewing machines since the 19th century. It triumphed over competing designs because it can run at higher speeds with less vibration. Rotary hooks and oscillating shuttles are the two most common bobbin drivers in use today.
In knitting, a stitch is a single loop of yarn, secured to the loops beside it to form a row or course of stitches and to the loops above and below it to form a wale.. In securing the previous stitch in a wale, the next stitch can pass through the previous loop either from below or above.
Bobbin tape lace. Bobbin tape lace is bobbin lace where the design is formed of one or more tapes curved so they make an attractive pattern. [1] The tapes are made at the same time as the rest of the lace, and are joined to each other, or themselves, using a crochet hook. The tapes are made curved, and by hand, using bobbin lace techniques.
The bullet shuttle is long and slender, shaped like a bullet, with a pointed tip that is sometimes called the hook. The bobbin inserts from the rear, and the tip is pointed for the purpose of intercepting the small loop temporarily created (by a brief upward needle motion) in the upper thread—see pictures below of its operation.