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Questions and Answers
What is the primary function of the beating-up motion in weaving?
What is the primary function of the beating-up motion in weaving?
Which component of the loom is primarily responsible for executing the beating-up motion?
Which component of the loom is primarily responsible for executing the beating-up motion?
How is the reed positioned in relation to the sley race board?
How is the reed positioned in relation to the sley race board?
What determines the number of dents in the reed?
What determines the number of dents in the reed?
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What mechanical part connects the crank to the reed?
What mechanical part connects the crank to the reed?
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What type of motion does the reed execute during the beating-up process?
What type of motion does the reed execute during the beating-up process?
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What effect does eccentricity have on the motion of the sley and reed?
What effect does eccentricity have on the motion of the sley and reed?
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What drives the motion of the crank shaft in the loom?
What drives the motion of the crank shaft in the loom?
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Study Notes
Weaving Mechanisms: Beating-up Motion
- Beating-up is the final primary motion of the loom, pushing newly inserted weft yarn into the cloth's fell.
- The fell divides the warp yarns and cloth.
- Beating-up is achieved with a loom accessory called a reed.
- Reeds are wooden, plastic, or metallic frames with vertically aligned metal wires spaced at fixed distances.
- Reed specifications are based on the reed number or count, representing the number of dents per unit length.
Regular Reed vs. Profiled Reed
- Diagrams (pictures) illustrate the differences.
Beating-up on Shuttle Looms
- Components include: heddle, drop wire, heddle eye, reed, shuttle, cloth fell, lay, harness, race board, front rest, and cloth roll. (A diagram is present)
- The diagrams show the arrangement and movement during the beating-up process.
Reed Mechanism (Detailed)
- The reed mechanism is connected to the crank shaft and machine pulley.
- The crank shaft has cranks connected to crank arms via crank pins.
- Each crank arm has a bearing to facilitate smooth operation.
- The crank arm and sword are attached via a sword pin.
- The reed is positioned above the sley race board.
- The reed cap is on top of the reed.
- The entire beating-up mechanism is mounted on a rocking shaft.
- The crank shaft's rotation drives the reed's forward and backward movement for beating-up.
Eccentricity
- The sley's and reed's motion deviates from simple harmonic motion (SHM) due to the cranks.
- Eccentricity is measured by Crank radius divided by Crank arm length.
- Eccentricity affects the speed of the sley's movement. The sley moves faster when near the front and slower during the back motion, affecting the picking or beat-up force.
- The typical value of eccentricity is between 0.25 and 0.4.
- Higher eccentricity leads to a greater beat-up force.
Beating-up on Shuttle-less Looms
- Components include: reed, fell, roller follower, sley, and a pair of matched cams. (A diagram is present)
Forces Acting in Beat-Up
- Diagrams representing the position of yarns during the process of beating up the weft, before and after the process of beating-up.
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Description
This quiz explores the beating-up motion in weaving, focusing on its role in pushing weft yarn into the cloth. It covers the components involved, such as reeds and shuttle looms, as well as the differences between regular and profiled reeds. Diagrams and detailed mechanisms provide a comprehensive understanding of this crucial action in the weaving process.
