Podcast
Questions and Answers
What is the primary function of the 2nd sensor (FD2) in the weaving mechanism?
What is the primary function of the 2nd sensor (FD2) in the weaving mechanism?
- To stop the machine if the weft yarn is present
- To clean the profile reed and prevent yarn breakage
- To stretch the filling yarn during shed closing
- To ensure the absence of yarn and stop the machine if necessary (correct)
What is the purpose of stretch nozzles in the weaving process?
What is the purpose of stretch nozzles in the weaving process?
- To create grooves for warp yarn travel
- To ensure filling yarn remains stretched during shed closure (correct)
- To mount the reed on the receiving side
- To stop the machine when no yarn is present
What characteristic defines a profile reed in the weaving process?
What characteristic defines a profile reed in the weaving process?
- It contains grooves to guide the filling yarn (correct)
- It is used to feed warp yarn into the machine
- It can be cleaned to enhance yarn tension
- It holds the fabric during the weaving process
Which type of temples is suitable for heavy-weight fabrics?
Which type of temples is suitable for heavy-weight fabrics?
Why is it essential to keep the reed properly cleaned in the weaving process?
Why is it essential to keep the reed properly cleaned in the weaving process?
What is the consequence of choking the jets of any sub-nozzle?
What is the consequence of choking the jets of any sub-nozzle?
What function do solenoid valves serve in relation to the sub-nozzles?
What function do solenoid valves serve in relation to the sub-nozzles?
What are the two types of cutters mentioned in the content?
What are the two types of cutters mentioned in the content?
How many catch cords are typically present in the weaving machine?
How many catch cords are typically present in the weaving machine?
What happens when the first weft sensor (FD1) detects the presence of weft yarn?
What happens when the first weft sensor (FD1) detects the presence of weft yarn?
What is the primary role of the weft cutter?
What is the primary role of the weft cutter?
What type of cutters are operated with the help of an electric motor?
What type of cutters are operated with the help of an electric motor?
What is the cutting position of the weft cutter set to leave on the selvedge?
What is the cutting position of the weft cutter set to leave on the selvedge?
What is the purpose of the Automatic Brake System (ABS) in a weaving mechanism?
What is the purpose of the Automatic Brake System (ABS) in a weaving mechanism?
What happens if the main nozzle is not properly aligned?
What happens if the main nozzle is not properly aligned?
How are the tandom nozzles and main nozzles related?
How are the tandom nozzles and main nozzles related?
What role do relay nozzles (sub-nozzles) play in the weaving process?
What role do relay nozzles (sub-nozzles) play in the weaving process?
What is a significant feature of the arrangement of sub-nozzles?
What is a significant feature of the arrangement of sub-nozzles?
What dictates the distance between sub-nozzles in relation to yarn count?
What dictates the distance between sub-nozzles in relation to yarn count?
What is the primary function of the tandom nozzle during the weaving process?
What is the primary function of the tandom nozzle during the weaving process?
How does the solenoid valve contribute to the operation of sub-nozzles?
How does the solenoid valve contribute to the operation of sub-nozzles?
What is the primary function of the air-jet picking process?
What is the primary function of the air-jet picking process?
Which part is responsible for unwinding yarn from a supply package in the air-jet picking system?
Which part is responsible for unwinding yarn from a supply package in the air-jet picking system?
What role does the disc tensioner play in the air-jet picking mechanism?
What role does the disc tensioner play in the air-jet picking mechanism?
What is indicated by the blinking red light on the magnetic pin assembly?
What is indicated by the blinking red light on the magnetic pin assembly?
How many picks of yarn are typically stored on the pre-winder dial?
How many picks of yarn are typically stored on the pre-winder dial?
Which part is NOT mentioned as a component of the air-jet picking system?
Which part is NOT mentioned as a component of the air-jet picking system?
What happens to the pre-winder when the number of windings on the dial is reduced to a set level?
What happens to the pre-winder when the number of windings on the dial is reduced to a set level?
What is the maximum weight of a filament yarn package in the air-jet picking system?
What is the maximum weight of a filament yarn package in the air-jet picking system?
Flashcards
Air-jet Picking
Air-jet Picking
The process of using air to insert filling yarn into the warp shed during weaving.
Supply Package
Supply Package
The package containing the filling yarn, often a cone or cheese, for weaving.
Cone Stand
Cone Stand
A device that holds and supports the supply package (cone) for yarn delivery.
Pre-winder
Pre-winder
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Pre-winder/Weft Accumulator dial
Pre-winder/Weft Accumulator dial
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Magnetic Pin
Magnetic Pin
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Disc Tensioner
Disc Tensioner
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Pick Length
Pick Length
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ABS (Automatic Brake System)
ABS (Automatic Brake System)
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Main Nozzle/Fixed Nozzle
Main Nozzle/Fixed Nozzle
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Tandom Nozzle/Movable Nozzle
Tandom Nozzle/Movable Nozzle
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Relay Nozzles (Sub-nozzles)
Relay Nozzles (Sub-nozzles)
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Weft Breakage
Weft Breakage
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Solenoid Valves
Solenoid Valves
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Number of Nozzles
Number of Nozzles
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FD2 Sensor
FD2 Sensor
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Stretch Nozzles
Stretch Nozzles
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Profile Reed
Profile Reed
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Temples
Temples
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Ring Type Temples
Ring Type Temples
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Sub-nozzle Choking
Sub-nozzle Choking
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Sub-nozzle Pitch
Sub-nozzle Pitch
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Solenoid Valve Function
Solenoid Valve Function
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Weft Cutter
Weft Cutter
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Leno Cutter (Waste Cutter)
Leno Cutter (Waste Cutter)
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Catch Cords
Catch Cords
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Weft Sensor (FD1 & FD2)
Weft Sensor (FD1 & FD2)
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What is the importance of cutter condition?
What is the importance of cutter condition?
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Study Notes
Air-Jet Picking Definition
- Air-jet picking is the process of drawing filling yarn from a supply package and inserting the yarn through the warp shed using an air stream.
Air-Jet Picking Major Parts
-
Supply Package:
- Can be cone or cheese shaped.
- Yarn is unwound.
- Weight varies depending on yarn type and count (2.5-10 lbs).
-
Cone Stand:
- Holds cones to feed yarn to the pre-winder.
- Cones are mounted on rubber pegs.
- A disc tensioner provides yarn tension during unwinding.
- Disc tensioner guides yarn.
-
Pre-winder/Weft Accumulator/Weft Feeder:
- Feeds yarn to the main nozzle.
- A magnetic pin detects the number of windings on the pre-winder dial.
- Yarn is wound onto the pre-winder dial.
- 2-3 picks of yarn are typically stored on the dial.
- Winding numbers/pick length influence dial adjustments.
- A nut adjusts dial diameter.
- Red light on magnetic pin assembly blinks during winding.
-
ABS (Automatic Brake System):
- Ensures continuous weft yarn supply to the main nozzle.
- Vibrates to detect yarn supply.
- Stops the loom if yarn breaks.
- Smooths yarn supply.
-
Main Nozzle/Fixed Nozzle:
- Feeds yarn to movable nozzle.
- Number of nozzles depends on pre-winders used.
- Proper alignment is important to avoid breakage.
-
Tandom Nozzle/Movable Nozzle:
- Blows weft yarn during pick insertion.
- Passes yarn to sub-nozzles.
- Number of tandem nozzles matches pre-winders.
- Fixed on the sley and moves with reed.
- Distance from weft cutter must be sufficient to avoid striking.
- Number of main and tandem nozzles always matches.
-
Relay Nozzles (Sub-nozzles):
- Fitted on the sley.
- Arranged across the reed.
- Assist the main nozzle in blowing pick through the guide channel.
- Divided into groups of 5 sub-nozzles, working in intervals.
- Solenoid valves supply air pressure to sub-nozzles.
- Air pressure increases from left to right in sub-nozzles.
- Distance between nozzles depends on weft yarn count.
- Drop in pressure between nozzles is compensated by nozzle spacing.
-
Solenoid Valve:
- Connects to relay nozzle and air tank.
- Regulates air by electromagnetic function.
- One valve operates 2-5 sub-nozzles.
- Main nozzle has its own solenoid valve.
-
Cutters:
- Two cutters: one on picking side (weft cutter) and one on receiving side (leno cutter/waste cutter).
- Weft cutter cuts weft yarn near the selvage.
- Leno cutter separates leno waste.
- Cutting position and degree are important parameters.
-
Catch Cords:
- Synthetic yarns.
- Grip weft waste on receiving side.
- 8-12 catch cords are common.
- Independent shedding.
-
Weft Sensors (FD1, FD2):
- Two sensors on receiving side, 120-130mm apart.
- Sense arrival of weft yarn.
- FD1 ensures presence; FD2 ensures absence.
- Machine stops if yarn is absent.
-
Stretch Nozzles:
- Stretch filling yarn during shed closing.
- Mounted on receiving side.
-
Profile Reed:
- Reed with grooves (profile).
- Directs filling yarn path.
- Avoids warp yarn interference.
- Cleaned to prevent warp/weft breakage.
-
Temples:
- Hold and stretch fabric during formation.
- Different types (ring, pin) for different fabric weights.
- Used on both fabric sides.
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