A Review - Design and analysis of let-off mechanism in shuttle loom

Mechanical Engineering

Weaving machine (loom) has very wide scope in modern textile. Shuttle and shuttle less weaving machines are widely used in textile industry. Tremendous developments has occurred in the field of shuttle less looms. As per Indian tradition, people have demand of clothes without selvage and low price. Therefore, it is necessary to develop the let-off mechanism of shuttle loom to achieve superior and cheap fabric quality of clothes. There are five basic mechanisms in shuttle loom, shedding, picking, beat up, let-off and take up. Let off is the secondary motion , it is also known as warp unwinding or warp releasing motion. The main function of the let mechanism is to deliver the warp to the weaving area at required rate and the constant tension by unwinding it from the weaver's beam. Length of the path traveled by catch holder varies for different position of intermediate rod in leverage system and subsequently the cover factor and fabric quality of clothes are changed. Torque requirement at the crank has to be fulfilled by the driving motor. Kinematic and dynamic analysis of the compound mechanism can be performed to obtain the torque required at the crank to run the mechanism flawlessly.

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