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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 ...
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-rod was an invention of eastern origin, and was introduced to Europe via Egypt in the first century AD. The Romans used it for both plain weave and twill. [4] After the shed-rod came the rigid heddle loom, where the shed is created by raising or lowering the rigid heddle. As the loom progressed, the shed-rod was replaced by a second ...
A factory must choose looms and shedding mechanisms to suit its commercial requirements. As a rule, greater warp control means greater expense. So it is not economical to purchase Jacquard machines if one can make do with a dobby mechanism. Beyond the capital expense, Jacquard machines cost more to maintain as they are complex, require highly ...
The study of temporary or elastic deformation in the case of engineering strain is applied to materials used in mechanical and structural engineering, such as concrete and steel, which are subjected to very small deformations.