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Cam shedding, also known as tappet shedding, is the control of the movement of heald shafts in weaving simple constructions by means of cams or tappets.. In positive cam shedding, the heddle (or heald) shafts are both raised and lowered by the tappets.
In weaving looms, a tappet is a mechanism which helps form the shed or opening in the warp threads (long direction) of the material through which the weft threads (side to side or short direction) are passed. The tappets form the basic patterns in the material such as plain weave, twill, denim, or satin weaves.
A dragonfly in its radical final moult, metamorphosing from an aquatic nymph to a winged adult.. In biology, moulting (British English), or molting (American English), also known as sloughing, shedding, or in many invertebrates, ecdysis, is a process by which an animal casts off parts of its body to serve some beneficial purpose, either at specific times of the year, or at specific points in ...
Passing the shuttle through the shed. A loom has to perform three principal motions: shedding, picking, and battening. Shedding. Shedding is pulling part of the warp threads aside to form a shed (the space between the raised and unraised warp yarns). The shed is the space through which the filling yarn, carried by the shuttle, can be inserted ...
This mechanism is probably one of the most important weaving innovations, as Jacquard shedding made possible the automatic production of unlimited varieties of complex pattern weaving. The term "Jacquard" is not specific or limited to any particular loom, but rather refers to the added control mechanism that automates the patterning.
The loom is powered by a leather steam-belt which drives the driving shaft. Here there is a flywheel to smooth the motion and a crank mechanism to drive the battens (swords) and a toothed wheel. This engages a second shaft known as the tappet shaft or wiper shaft whose job is to lower the treadles and throw the shuttle.
The cam can be seen as a device that converts rotational motion to reciprocating (or sometimes oscillating) motion. [clarification needed] [3] A common example is the camshaft of an automobile, which takes the rotary motion of the engine and converts it into the reciprocating motion necessary to operate the intake and exhaust valves of the cylinders.
The shed, the triangular aperture on the far right, shown from the back of a table loom Passing the shuttle through the shed The shed shown in tablet weaving. In weaving, the shed is the temporary separation between upper and lower warp yarns through which the weft is woven. The shed is created to make it easy to interlace the weft into the ...