Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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shuttle threads

The threads in the OVERSEWING method which pass through each loop created by the needles of th machine. Punches descend from above penetrate the paper, and then with draw. The needles then enter from below and, when they reach the top o the pile of leaves making up the "section," they drop slightly leaving a series of loops of thread through which the shuttle needles carry their thread from left and right, meeting in the center. A they reach the center, two catch teeth emerge and snag the threads, holding them until the shuttles retract. Th, cycle is then completed and the head of the machine drops, tightening th loops around the shuttle threads. It is therefore, the shuttle threads which secure the individual oversewing stitches in the "section."

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