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Concept
Power loom
Résumé
A power loom is a mechanized loom, and was one of the key developments in the industrialization of weaving during the early Industrial Revolution. The first power loom was designed and patented in 1785 by Edmund Cartwright. It was refined over the next 47 years until a design by the Howard and Bullough company made the operation completely automatic. This device was designed in 1834 by James Bullough and William Kenworthy, and was named the Lancashire loom.
By the year 1850, there were a total of around 260,000 power loom operations in England. Two years later came the Northrop loom which replenished the shuttle when it was empty. This replaced the Lancashire loom.
The main components of the loom are the warp beam, heddles, harnesses, shuttle, reed, and takeup roll. In the loom, yarn processing includes shedding, picking, battening and taking-up operations.
Shedding. Shedding is the raising of the warp yarns to form a loop through which the filling yarn, carried by the shuttle, can be inserted. The shed is the vertical space between the raised and unraised warp yarns. On the modern loom, simple and intricate shedding operations are performed automatically by the heddle or heald frame, also known as a harness. This is a rectangular frame to which a series of wires, called heddles or healds, are attached. The yarns are passed through the eye holes of the heddles, which hang vertically from the harnesses. The weave pattern determines which harness controls which warp yarns, and the number of harnesses used depends on the complexity of the weave. Two common methods of controlling the heddles are dobbies and a Jacquard Head.
Picking. As the harnesses raise the heddles or healds, which raise the warp yarns, the shed is created. The filling yarn is inserted through the shed by a small carrier device called a shuttle. The shuttle is normally pointed at each end to allow passage through the shed. In a traditional shuttle loom, the filling yarn is wound onto a quill, which in turn is mounted in the shuttle.
Source officielle
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