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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.
To intertwine them, the machine must pass its shuttle (containing the bobbin and the lower thread) through a loop temporarily created from the upper thread. Singer bullet shuttle with bobbin exposed. Early sewing machines of the 19th century oscillate their shuttles back and forth on linear horizontal tracks—an arrangement called a ...
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 ...
Meanwhile, the lower thread is wound onto a bobbin, which is inserted into a case in the lower section of the machine below the material. 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 ...
Some threads can be used for applications up to 800 °C (1472 °F). There are a variety of different sewing threads available which have different applications and benefits. Kevlar-coated stainless steel sewing threads have a high-temperature and flame-resistant steel core combined with Kevlar coating designed to facilitate easier machine ...
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]