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Questions and Answers
What is the primary function of the picking stick in the picking mechanism on a loom?
What is the primary function of the picking stick in the picking mechanism on a loom?
What impact does the constraint of the picker moving in a straight line have?
What impact does the constraint of the picker moving in a straight line have?
Which of the following actions can increase PPM (picks per minute) in a loom?
Which of the following actions can increase PPM (picks per minute) in a loom?
What is one disadvantage of the over picking mechanism?
What is one disadvantage of the over picking mechanism?
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How is under picking controlled in the loom mechanism?
How is under picking controlled in the loom mechanism?
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What does the position of the picking arm influence in the loom operation?
What does the position of the picking arm influence in the loom operation?
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What role does the spindle play in the over picking mechanism?
What role does the spindle play in the over picking mechanism?
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What is the primary function of the clip on the shuttle?
What is the primary function of the clip on the shuttle?
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Why has the over picking mechanism become obsolete?
Why has the over picking mechanism become obsolete?
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What material is often used to line the inner walls of the shuttle to minimize friction?
What material is often used to line the inner walls of the shuttle to minimize friction?
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How does the picking unit in an over picking mechanism operate?
How does the picking unit in an over picking mechanism operate?
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What is the purpose of the shuttle eye on the shuttle?
What is the purpose of the shuttle eye on the shuttle?
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What mechanism is responsible for the shuttle's flight across the loom?
What mechanism is responsible for the shuttle's flight across the loom?
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What must be aligned for the correct flight of the shuttle?
What must be aligned for the correct flight of the shuttle?
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What is the typical weight range of a shuttle?
What is the typical weight range of a shuttle?
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In which shuttle picking mechanism is the unit positioned below the loom?
In which shuttle picking mechanism is the unit positioned below the loom?
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What is one advantage of shuttle picking in weaving?
What is one advantage of shuttle picking in weaving?
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Which of the following is a limitation of shuttle picking?
Which of the following is a limitation of shuttle picking?
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Why is the pirn important in shuttle weaving?
Why is the pirn important in shuttle weaving?
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What is a consequence of the limited size of the pirn in shuttle weaving?
What is a consequence of the limited size of the pirn in shuttle weaving?
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What is a unique characteristic of the noise produced during shuttle picking?
What is a unique characteristic of the noise produced during shuttle picking?
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What kind of energy impact does shuttle picking have on the loom?
What kind of energy impact does shuttle picking have on the loom?
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What safety hazard is associated with shuttle picking?
What safety hazard is associated with shuttle picking?
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What impact does shuttle picking have on the twist of the yarn?
What impact does shuttle picking have on the twist of the yarn?
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What is a primary reason for the higher speed of projectiles compared to shuttles?
What is a primary reason for the higher speed of projectiles compared to shuttles?
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What weight range do projectiles typically fall within?
What weight range do projectiles typically fall within?
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Which material is K3 type projectile made from?
Which material is K3 type projectile made from?
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What role does the weft brake play in projectile weaving mechanisms?
What role does the weft brake play in projectile weaving mechanisms?
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How many tuck-in needles are required per width of cloth?
How many tuck-in needles are required per width of cloth?
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What is indicated by the term 'supply package' in projectile weaving?
What is indicated by the term 'supply package' in projectile weaving?
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What is the function of the projectile feeder gripper?
What is the function of the projectile feeder gripper?
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What aspect determines the number of weft brakes needed?
What aspect determines the number of weft brakes needed?
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What is the primary function of the weft clamp during the picking process?
What is the primary function of the weft clamp during the picking process?
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How does the initial water-jet function during the yarn insertion phase?
How does the initial water-jet function during the yarn insertion phase?
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What mechanism is used to check for the presence of the weft yarn after it exits the shed?
What mechanism is used to check for the presence of the weft yarn after it exits the shed?
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Which component is responsible for cutting the weft yarn after it has been inserted?
Which component is responsible for cutting the weft yarn after it has been inserted?
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What governs the opening time of the clamp during the weft yarn insertion?
What governs the opening time of the clamp during the weft yarn insertion?
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What is the defined action called when the pump begins the process of water supply and suction?
What is the defined action called when the pump begins the process of water supply and suction?
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What is the maximum number of weft colors that can be inserted using the weft mixer?
What is the maximum number of weft colors that can be inserted using the weft mixer?
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In rapier picking, what connects the rapiers to the picking mechanism?
In rapier picking, what connects the rapiers to the picking mechanism?
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What is the primary function of the main nozzle in a water-jet loom?
What is the primary function of the main nozzle in a water-jet loom?
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What is the maximum speed that water-jet machines can achieve in picks per minute?
What is the maximum speed that water-jet machines can achieve in picks per minute?
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Which part of the water-jet loom is responsible for cutting the weft yarn?
Which part of the water-jet loom is responsible for cutting the weft yarn?
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How much water is required for each weft yarn in a water-jet loom?
How much water is required for each weft yarn in a water-jet loom?
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What role does the accumulator play in a water-jet loom?
What role does the accumulator play in a water-jet loom?
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What is one characteristic of water-jet machines in comparison to other types of machines?
What is one characteristic of water-jet machines in comparison to other types of machines?
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Which component is used to hold the tip of the weft yarn in a water-jet loom?
Which component is used to hold the tip of the weft yarn in a water-jet loom?
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Which statement about water-jet machines is incorrect?
Which statement about water-jet machines is incorrect?
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Study Notes
Weaving Mechanisms
- Picking is the process of interlacing weft yarns through the warp shed.
- Picking speed (picks/min) is related to loom width; wider looms have a lower picking speed.
- Different picking methods exist: shuttle looms (300 picks/min), projectile looms (1500 picks/min), air-jet looms (1500 picks/min), rapier looms (700 picks/min) and water-jet looms (1000 picks/min).
- Picking types classified into shuttle, shuttle-less and fluid: Solid (e.g., Rapier, Projectile), Fluid (e.g., Water Jet, Air Jet).
- Loom timing is the relative sequence of loom motions, expressed by crank angular position.
- Different loom motions are detailed (e.g., Shedding, Picking and Checking, Shedding for early and late shedding).
- Shuttle picking involves a rectangular wooden shuttle, with a pirn for weft yarn insertion. It is pushed from one side of the loom to the other to feed weft yarn.
- Shuttle picking is classified into Over and Under
- Shuttle boxes, and picking sticks, are essential for proper shuttle function.
Loom Timing
- Loom timing is the relative sequence of various primary and secondary motions expressed in terms of angular positions of the loom crank.
- A loom timing diagram illustrates the sequence of events in a shuttle loom.
Shuttle Picking
- Shuttle looms use a shuttle to carry the weft yarn through the shed.
- The shuttle is a rectangular piece of wood with tapered ends for easy passage through the shed.
- Pickers and shuttle are integral for this process.
Shuttle-Less Picking
- Shuttle-less looms use methods other than shuttles to insert the weft.
- Shuttle-less methods include projectile, air jet, and rapier picking.
- Projectile looms, air-jet looms, water-jet looms, and rapier looms are detailed.
Projectile Picking
- Projectile picking is a method of inserting weft yarn into the shed with a projectile.
- Features include low power consumption, up to 6 multi-colour pick insertion, and wider loom widths.
- Projectile looms have characteristics and disadvantages.
- Projectile picking mechanism and parts are detailed.
Air-Jet Picking
- Air-jet picking involves inserting weft yarn using an air stream.
- Parts include the various air tanks, valves, and pressure control unit.
Water-Jet Picking
- Water-jet picking utilizes a water stream to insert the weft yarn into the shed.
- Water-jet looms have parts detailed to explain working mechanism.
Rapier Picking
- Rapier picking uses rapiers to carry the weft.
- Rapier looms vary in types, but all use rapiers.
- Single and Double rapier picking methods are detailed.
- Types of rapiers are detailed (e.g., Rigid, Gabler, Flexible, and Dewas).
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Description
Test your knowledge on various weaving mechanisms and techniques. This quiz covers the picking process, different loom types, and their respective speeds. Understand the fundamental mechanics involved in weaving fabrics using different methods and technologies.
