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Secondary Motion

This document summarizes different types of secondary motions used in weaving, including take-up and let-off motions. Positive take-up uses a gear-driven take-up roller to maintain pick spacing, while negative take-up uses a weight or spring to rotate the roller only when greater than fabric tension. Positive let-off mechanically drives the beam, while negative let-off allows the beam to be pulled by warp against a braking force.

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583 views7 pages

Secondary Motion

This document summarizes different types of secondary motions used in weaving, including take-up and let-off motions. Positive take-up uses a gear-driven take-up roller to maintain pick spacing, while negative take-up uses a weight or spring to rotate the roller only when greater than fabric tension. Positive let-off mechanically drives the beam, while negative let-off allows the beam to be pulled by warp against a braking force.

Uploaded by

amboklate
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PPT, PDF, TXT or read online on Scribd
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SECONDARY MOTION

PREPARED BY: MUHAMMAD ISMAIL BIN AB KADIR

TAKE-UP MOTION
This is the motion that withdraws fabric from the weaving area at a constant rate. It ensures that therequired pick spacing is maintained and then winds it onto the cloth roller Can be divided into 2 types: 1. Positive Take-up 2. Negative Take-up

Positive Take-up
It is the motion in which the take up roller is gear driven, a change wheel or variable-throw pawl and ratchet being provided to allow the required rate to be obtained, so determining the pick spacing

Negative Take-up
It is the motion in which the take up roller is rotated by means of a weight or spring, this roller only rotates when the force applied by the weight or spring is greater than the warp lay tension in the fabric. The take up rate is controlled by the size of the force applied by the weight or spring and/or the warp tension

Let-off Motion
This is the motion which delivers warp to the weaving area at the required rate and at a suitable constant tension by unwinding it from a flanged tube known as the weavers beam Can be divided into 2 types: 1. Positive Let-off 2. Negative Let-off

Positive Let-off
A mechanism controlling the rotation of the beam on a weaving or other fabric forming machine where the beam is driven mechanically

Negative let-off
A mechanism controlling the rotation of the beam on a weaving or other fabric forming machine where the beam is pulled round by warp against a braking force applied to beam.

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