Podcast
Questions and Answers
What is the relationship between the revolutions per minute of the crank shaft and the number of picks inserted per minute?
What is the relationship between the revolutions per minute of the crank shaft and the number of picks inserted per minute?
How many shedding cams are typically mounted on the bottom shaft for a plain weave?
How many shedding cams are typically mounted on the bottom shaft for a plain weave?
What is the purpose of the 'dwell' period in shedding?
What is the purpose of the 'dwell' period in shedding?
In a 3×1 twill weave, how many shedding cams need to be mounted on the cam shaft?
In a 3×1 twill weave, how many shedding cams need to be mounted on the cam shaft?
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What is the primary function of the crank shaft in the loom mechanism?
What is the primary function of the crank shaft in the loom mechanism?
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Which shedding mechanism uses a cam shaft for operations involving more than two healds?
Which shedding mechanism uses a cam shaft for operations involving more than two healds?
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During the 360-degree cycle, how does the motion of the sley differ from the healds?
During the 360-degree cycle, how does the motion of the sley differ from the healds?
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What happens to the reed at 0 degrees in the shedding cycle?
What happens to the reed at 0 degrees in the shedding cycle?
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Which of the following best describes the motion of the reed during the shedding cycle?
Which of the following best describes the motion of the reed during the shedding cycle?
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What mechanism connects the loom pulley to the motor pulley?
What mechanism connects the loom pulley to the motor pulley?
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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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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.
