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Enough upper thread is pulled from above to pass around the bobbin case, which sits loosely inside the hook frame such that loops of thread can pass completely over it. The excess thread, no longer needed, is then pulled back upward by the sewing machine's take-up arm.
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 ...
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.
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 ...
Two decades later, when the patents had expired and the Sewing Machine Combination patent pool had dispersed, White Sewing Machine Company employees D'Arcy Porter and George W. Baker built a new machine that made successful use of it. The "White Sewing Machine", as it was first named, entered production in 1876. It was popular in its time, and ...
In 1851 Wilson patented the rotating hook, which performed the functions of a shuttle by seizing the upper thread and throwing its loop over a circular bobbin containing the under thread. [2] This simplified the construction of the machine by getting rid of the reciprocation motion of the ordinary shuttle, and contributed to make a light tool ...
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]