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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.
The hook mechanism carries the upper thread entirely around the bobbin case so that it has made one wrap of the bobbin thread. Then the take-up arm pulls the excess upper thread (from the bobbin area) back to the top, forming the lockstitch. Then the feed dogs pull the material along one stitch length, and the cycle repeats.
The lockstitch sewing machine, invented and developed in the 18th and 19th centuries [10] [11], forms a stitch with two threads: one passed through a needle and another from a bobbin. Each thread stays on the same side of the material being sewn, interlacing with the other thread at each needle hole thanks to the machine's movement. [ 12 ]
1851 by Allen B. Wilson [8] Figures from Wilson's patent 9041, showing rotary hook and bobbin: Rotary hook machines hold their bobbin stationary, and continuously rotate the thread hook around it. The design was popularized in the White Sewing Machine Company's 'Family Rotary' sewing machine [9] and Singer's models 95 and 115. [10]
A free arm houses the machine's feeder and bobbin driver in a tubular arm-shaped bed, enabling material to be wrapped around the mechanism during sewing rather than simply resting on top of it. A free arm greatly simplifies sewing tasks like darning and hemming on delicate fabrics and difficult-to-reach seams—uses for which Elna was heavily ...
A sewing machine thus electrified now fit entirely inside a woman-portable carrying case. Electric motors became so common that Singer made provision for them: the model 127/128 'modernized' versions included mounting lugs for a motor, whereas earlier models had to be drilled and tapped.
On February 3, he began the construction of his first machine, and about April 1 completed it, making with it dress waists and other articles requiring fine sewing. His machine differed from those invented by Elias Howe, in the fact that, having a double-pointed shuttle, combined with the needle, it made two stitches instead of one with each ...
Tension in a sewing machine refers to the pull of the thread between the needle and the bobbin. Sewing machines have tension discs and a tension regulator. If the stitch is too saggy or too tight, the most likely cause is a tension problem.
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