Tricot Machine Technology Quiz
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Questions and Answers

What is the purpose of the guides overlapping across the beards during the knitting cycle?

  • To increase the swing of the guide-bar
  • To reduce the time required for the knitting process (correct)
  • To allow for the descent of the needle bar
  • To prevent the needles from rising to full height

    • During the pressing stage of the knitting cycle, what happens after the needle bar descends?

  • The sinkers withdraw to create space
  • The presser advances and closes the beards (correct)
  • The beards open to release the overlaps
  • The old overlaps are knocked-over

    • What is the result of the sinkers moving forward at the end of the knitting cycle?

  • They release the fabric loops and allow for needle ascent
  • They assist in increasing the guide-bar swing
  • They allow the old overlaps to slip off the beards
  • They hold down the fabric loops and push them away from the ascending needles (correct)

    • What occurs during the knock-over and underlap shog process?

    <p>The heads of the needles descend below the upper surface of the sinker bellies (A)</p> Signup and view all the answers

    What is a common occurrence of the underlap shog during the knitting cycle?

    <p>It can happen at any time between pressing and knock-over (D)</p> Signup and view all the answers

    What component of a tricot machine is responsible for maintaining tension in the warp threads?

    <p>Tension bar (A)</p> Signup and view all the answers

    Which part of the tricot machine is responsible for driving the knitting elements?

    <p>Crank shaft drive (C)</p> Signup and view all the answers

    What determines the gauge of needles on a tricot machine?

    <p>Number of sinkers per 25 mm (B)</p> Signup and view all the answers

    How do guides in a tricot machine receive lateral motion?

    <p>From the pattern wheel (A)</p> Signup and view all the answers

    What is the primary function of sinkers in a tricot machine?

    <p>To hold the fabric down and prevent older loops from rising (D)</p> Signup and view all the answers

    During the knitting cycle, what position do the needles rise to?

    <p>2/3 of their height (C)</p> Signup and view all the answers

    What material is commonly used for fabric take-up rollers in a tricot machine?

    <p>Steel (C)</p> Signup and view all the answers

    What mechanism closes the beard of the needle during loop formation in beard needle machines?

    <p>Presser (D)</p> Signup and view all the answers

    What is the primary outcome of the guides swinging to the front during the knitting cycle?

    <p>The old overlaps slip off the beards. (D)</p> Signup and view all the answers

    What does the descent of the needle bar during the pressing stage accomplish?

    <p>It allows the open beards to cover the new overlaps. (D)</p> Signup and view all the answers

    What role does the presser play during the knitting cycle?

    <p>It advances and closes the beards after pressing. (C)</p> Signup and view all the answers

    During which stage does the knock-over occur in relation to the sinkers?

    <p>As the sinkers are withdrawn. (A)</p> Signup and view all the answers

    What typically happens during the underlap shog in the knitting cycle?

    <p>It is usually executed in opposite directions on the guide bars. (B)</p> Signup and view all the answers

    What component is responsible for carrying the warp threads in a tricot machine?

    <p>Warp beam (B)</p> Signup and view all the answers

    Which of the following is NOT a function of the sinkers in a tricot machine?

    <p>Facilitate the lateral motion of guides (B)</p> Signup and view all the answers

    What mechanism provides motion to the needles mounted in the needle bar?

    <p>Main cam shaft (A)</p> Signup and view all the answers

    What typically determines the width of a tricot machine?

    <p>Length of the needle bar (C)</p> Signup and view all the answers

    In a tricot machine, what happens to the presser during the knitting cycle?

    <p>It is retracted during loop formation (A)</p> Signup and view all the answers

    How many guide bars are usually provided on a tricot machine?

    <p>A minimum of two guide bars (C)</p> Signup and view all the answers

    What part of the tricot machine winds up the fabric on large rolls?

    <p>Batch roller (B)</p> Signup and view all the answers

    What type of motion do the guides receive from the main cam shaft in a tricot machine?

    <p>Forward and backward motion (A)</p> Signup and view all the answers

    Flashcards

    Tricot Machine Parts

    Tricot machines have warp beams, sley bars, tension bars, knitting elements (guides, sinkers, needles, presser bar), fabric take-up rollers, and a batch roller.

    Knitting Elements

    The knitting elements include needles, warp guides, sinkers, and a presser bar. These are crucial for fabric formation.

    Needles (Tricot)

    Needles are mounted in a bar, and the bar is driven by the main cam. The gauge (number of needles) determines the machine width.

    Warp Guides

    Thin, flat wires in a guide bar assembly holding the warp threads. Multiple guide bars are common.

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    Sinkers

    Thin steel sheets holding the fabric loop in the needle's throat. Prevent needles from rising through old loops.

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    Presser

    An external device that closes needle beards during loop formation, often made of fiber or plastic.

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    Knitting Cycle (Rest Position)

    Needles are at most of their height, beards point back, and the presser is withdrawn.

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    Knitting Cycle (Backward Swing)

    Guides move, sinkers hold old overlaps to form fabric.

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    Overlap Guides

    Guides are overlapped across beards, usually by one needle space, in opposite directions.

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    Guide Swing and Rise (c, d)

    Guides swing forward, needles rise, new overlaps slip off beards onto stems above.

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    Pressing (e)

    Needle bar descends, open beards cover new overlaps, and presser advances to close beards lightly.

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    Landing (f)

    Sinkers withdraw, old overlaps land onto closed beards.

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    Knock-over and Underlap Shog (g)

    Presser withdraws, needle bar descends, old overlaps knock-over, then underlap shog, usually in opposite directions.

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    What does the guide swing accomplish?

    The guides swinging forward moves the new overlaps off the beards onto the stems above the old overlaps. This helps create the fabric structure.

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    What is the purpose of the presser?

    The presser descends to close the beards over the new overlaps. This helps to secure the newly formed loop.

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    What does landing mean?

    Landing refers to the old overlaps being moved onto the closed beards. This happens when the sinkers withdraw.

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    What is the knock-over shog?

    The knock-over shog is the process of the old overlaps being pushed over as the needle bar descends. This action is essential for forming the fabric loops.

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    Why is the underlap shog important?

    The underlap shog helps to create the fabric structure by moving fabric loops underneath the needles. This happens in opposite directions on the guide bars, contributing to the overall fabric design.

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    Tricot Machine: What is it?

    The Tricot machine is a specialized textile machine that creates fabrics with a unique structure using a technique called tricot knitting.

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    Tricot Machine: Key Parts

    A Tricot machine consists of important components like the warp beam, sley bars, tension bars, knitting elements (needles, guides, sinkers, presser bar), fabric take-up rollers, and a batch roller.

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    Tricot Knitting: Needles

    Needles in a tricot machine are vertically mounted on a movable bar. They create loops by going up and down, and the number of needles determines the fabric's width.

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    Tricot Knitting: What do guides do?

    Guide bars hold the warp threads and move them back and forth to create the fabric structure. They have two motions: forward and backward, and lateral (sideways).

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    Tricot Knitting: What are sinkers?

    Sinkers are thin metal sheets that hold the fabric loops as the needles move up and down. They stop the needles from going through old loops.

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    Tricot Knitting: Presser Bar

    The presser bar is a device that closes the needle beards during loop formation. It's made of fiber or plastic and helps create the tight loops.

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    Study Notes

    Tricot Machine Technology

    • Tricot machines are used in knitting technology
    • The machine has several key components
    • Key components include warp beams, sley bars, tension bars, knitting elements, fabric take-up rollers, and a batch roller.
    • The warp beam carries the warp threads
    • The sley bars space the warp threads
    • The tension bars maintain tension in individual warp threads
    • Knitting elements includes warp guides, sinkers, needles, and a presser bar.
    • Fabric take-up rollers take fabric from rollers at a constant rate
    • The batch roller winds up the fabric onto large rolls
    • The crank shaft drive, within a case, powers the knitting components

    Main Parts of a Tricot Machine

    • Warp beams, carrying the warp threads
    • Sley bars, spacing the warp threads
    • Tension bars, keeping tension on warp threads
    • Knitting elements: warp guides, sinkers, needles, and presser bar.
    • Fabric take-up rollers, handling the fabric at a constant rate
    • Batch roller, where the fabric is wound onto large rolls
    • Crank shaft drive, powering the knitting components within a housing

    Knitting Elements

    • Guides: thin, flat wires; 25mm wide
    • Attached vertically to guide bar assemblies
    • Usually at least 2 guide bars per tricot machine, though 3 or 4 are also common
    • Have two movement types: one forward and backward from a cam shaft; and lateral (shogging) motion from the pattern wheel.
    • Needles: mounted in leads and vertically inserted into the needle bar.
    • The needle bar gets motion from the main cam shaft
    • Machine gauge, normally varying between 20-36
    • Needle bar length determines machine width, typically 210cm to 420cm
    • Sinkers: also made of thin, punched steel sheets; number of sinkers per 25mm determines the gauge; hold fabric in the throat as the needles move; prevent needles from going through existing loops to aid knock over.
    • Sinkers are mounted on a movable sinker bar, also driven by the main cam shaft
    • Presser: a strip of fibrous or plastic material attached to the presser bar along the entire needle bed; closes the beard of the needle during loop formation

    Knitting Cycle

    • Rest position (a): needles rise to 2/3 full height, beards face machine's back, presser withdrawn

    • Forward swing & overlap (b, c): Guides move forward with sinkers overlapping old loops, positioning at correct height on needle stems.

    • Return swing & second rise (c, d): Guides swing to front, needles rise to full height, new loops slip off beards onto stems above old overlaps, minimizing guide bar swing.

    • Pressing (e): Needle bar descends, open beards cover new overlaps, presser advances/closes beards

    • Landing (f): Sinkers withdraw, upward curve of their bellies lands old loops onto closed beards;

    • Knock-over & underlap shog (g): Presser withdrawn, needle bar descends, causing the old overlaps to be knocked over; underlap shog can occur anytime between pressing and knock-over usually occurs in opposite directions on the two guide bars.

    • Sinkers move (h): Sinkers move forward, holding down fabric loops; pushing them away from rising needles.

    • The knitting cycle reduces necessary guide bar swing and time required.

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    Tricot Machine PDF

    Description

    Test your knowledge of tricot machine technology and its key components. This quiz covers the essential parts such as warp beams, sley bars, and knitting elements. Understand how these components work together in the knitting process.

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