Loom Timing and Shedding Principles
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Questions and Answers

What is the relationship between the revolutions per minute of the crank shaft and the number of picks inserted per minute?

  • The crank shaft revolution per minute is always half of the picks inserted.
  • The crank shaft revolution per minute is equal to the picks inserted per minute. (correct)
  • The crank shaft revolution per minute equates to double the picks inserted.
  • The crank shaft revolution per minute increases with fewer picks inserted per minute.

How many shedding cams are typically mounted on the bottom shaft for a plain weave?

  • Four shedding cams are mounted.
  • Two shedding cams are mounted. (correct)
  • No shedding cams are used.
  • One shedding cam is mounted.

What is the purpose of the 'dwell' period in shedding?

  • To enable the healds to remain stationary for shuttle passage. (correct)
  • To allow the reed to beat up more effectively.
  • To increase the number of picks per minute.
  • To speed up the crank shaft rotation.

In a 3×1 twill weave, how many shedding cams need to be mounted on the cam shaft?

<p>Four shedding cams are needed. (A)</p> Signup and view all the answers

What is the primary function of the crank shaft in the loom mechanism?

<p>To directly generate the movement of the loom pulley. (C)</p> Signup and view all the answers

Which shedding mechanism uses a cam shaft for operations involving more than two healds?

<p>Dobby shedding mechanism. (C)</p> Signup and view all the answers

During the 360-degree cycle, how does the motion of the sley differ from the healds?

<p>The sley continuously moves while the healds remain stationary at times. (D)</p> Signup and view all the answers

What happens to the reed at 0 degrees in the shedding cycle?

<p>The reed performs the beat-up operation. (B)</p> Signup and view all the answers

Which of the following best describes the motion of the reed during the shedding cycle?

<p>It moves back and forth continuously through the entire cycle. (B)</p> Signup and view all the answers

What mechanism connects the loom pulley to the motor pulley?

<p>The crank shaft. (A)</p> Signup and view all the answers

Flashcards

Loom Timing

The precise coordination of loom components' movements to create and maintain the shed, allowing the shuttle to pass through.

Crank Shaft RPM

The number of revolutions per minute of the crank shaft, directly related to the speed of weaving (picks per minute).

Shedding

The process of creating an opening (shed) in the warp threads to allow the shuttle to pass.

Shedding Cams

Rotating mechanisms that control the lifting and lowering of the healds in shedding.

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Tappet Shaft

A cam-based shaft used for complex shedding patterns involving more than two healds.

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Dwell Period

The time the healds remain stationary to prevent obstructions during the shuttle's passage.

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Early/Late Shedding

Timing variations for the shed opening that affect weaving quality and pattern.

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Loom Pulley

A pulley on the loom receiving motion from the motor to drive the loom mechanisms.

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Plain Weave

A fundamental weaving pattern needing two shedding cams to create the shed.

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3x1 Twill Weave

More complex weaving pattern with a requirement of 4 shedding cams on the tappet shaft.

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Reed

A part of the loom that strikes the woven fabric, cutting the fibers to ensure a straight and clean thread.

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Sley

Carries the reed that's connected to the crank shaft and responsible for beat-up and fabric striking, controlling thread's path.

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Jacquard Weaving

Advanced weaving system using a complex mechanism to create intricate patterns by controlling every warp thread individually.

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Pick/Minute

The number of times the shuttle passes through the shed in a minute. Directly correlates with the loom speed.

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Study Notes

Loom Timing & Shedding

  • Loom timing is crucial for proper loom operation
  • Loom timing is based on the position of the crank in a weaving cycle (one pick)
  • Crank angle is measured in degrees (0° - 360°) during one crank revolution
  • One pick equals one complete crank shaft rotation
  • Various loom operations are timed based on crank shaft angular position
  • Timing of shedding (opening and closing the shed) can be early or late
  • Early shedding has a larger shed angle at beat up, helpful for high weft density fabrics, and produces clear sheds and better fabric hand
  • Late shedding has a smaller shed angle at beat up, results in lower end breakage and is used for twill and satin fabrics

Motion Transmission

  • Main motor drives driving shafts
  • Crank and bottom shaft connect to the loom pulley systems
  • Crankshaft has 200 rpm
  • Bottom shaft has 100 rpm
  • Tappet shaft has 50 rpm
  • Motor pulley rpm may vary

Basic Shedding Mechanisms

  • Paddle/treadle loom (hand loom)
  • Tappet shedding mechanism
  • Dobby shedding mechanism
  • Jacquard shedding mechanism
  • Combined shedding mechanisms

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Related Documents

Loom Timing & Shedding PDF

Description

This quiz covers the important concepts of loom timing and shedding within weaving technology. Understand the crank's role in the weaving cycle and how timing affects fabric quality. Test your knowledge on the mechanisms involved in motion transmission and basic shedding mechanisms.

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