Rotary hook machines hold their bobbin stationary, and continuously rotate the thread hook around it.
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;Bobbin : A small spool of thread inside the rotary hook housing of a sewing machine.
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This machine used the curved needle and embodies the rotary hook and the four-motion feed.
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Sometimes it refers to a bobbin case, and sometimes it refers to a rotary hook design.
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He went into partnership with Nathaniel Wheeler to produce a machine with a rotary hook instead of a shuttle.
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The rotary hook was co-invented by American cabinetmaker Allen B . Wilson and Nathaniel Wheeler in 1851.
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Allen B . Wilson invented it during the time period 1850 to 1854, while also developing the rotary hook.
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The rotary hook design was then called the " Wheeler & Wilson principle " after Wilson's partnership with Wheeler.
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*A rotary hook is a bobbin driver design used in lockstitch sewing machines of the 19th and 20th century and beyond.
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Rotary hook creating a lockstitchThe rotary hook continuously rotates in place, hooking the upper thread each time its pointed tip passes the 12 o'clock position.
