Introduction to Knitting Machines
93 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary function of a knitting machine?

  • To create knitted fabrics (correct)
  • To cut fabrics into specific shapes
  • To dye fabrics in different colors
  • To weave fibers into a tight structure

Which of the following is NOT a type of knitting machine mentioned?

  • Electronic machines
  • Circular machines
  • Flat machines
  • Weaving machines (correct)

What characterizes circular knitting machines?

  • They knit flat fabrics only
  • They produce tubular fabric in continuous lengths (correct)
  • They are primarily used for sewing garments
  • They only use non-mechanical methods

How do pattern stitches get selected in modern knitting machines?

<p>Using electronic pattern reading devices or computers (C)</p> Signup and view all the answers

Which type of machine is primarily used for high-speed fabric knitting?

<p>Large diameter circular latch needle machines (D)</p> Signup and view all the answers

What is the function of the timing or counting device in garment-length machines?

<p>To control the knitting action for garment-length sequences (B)</p> Signup and view all the answers

What are the two main categories of weft knitting machines based on end product?

<p>Circular and flat machines (C)</p> Signup and view all the answers

What is a distinguishing feature of garment-length machines?

<p>They are used to knit various types of wear like leg wear and gloves (B)</p> Signup and view all the answers

What is the primary purpose of the lifting action of the needles during the traverse?

<p>To prevent unnecessary strain on old loops (B)</p> Signup and view all the answers

At what point are the needle butts lifted to 'tucking in the hook' height?

<p>When they contact the leading edge of the raising cams (D)</p> Signup and view all the answers

How is the yarn fed during the knitting process?

<p>As the needles descend controlled by the guard cam (C)</p> Signup and view all the answers

What adjustment is made to produce synchronized knocking-over of both needle beds?

<p>Set the stitch cam S (R) lower than AS (R) (A)</p> Signup and view all the answers

What is the effect of delayed timing in the knocking-over process?

<p>Knock-over in the front bed occurs after the back bed (C)</p> Signup and view all the answers

Why is delayed timing of the knock-over primarily used in finer gauges?

<p>It is not effective in broad ribs (C)</p> Signup and view all the answers

What prevents the needles from impacting unnecessary strain on the old loops before knitting commences?

<p>The alternating lifting action of stitch cams (C)</p> Signup and view all the answers

What characterizes large-diameter circular knitting machines?

<p>They measure from 24 to 40 inches. (D)</p> Signup and view all the answers

Which aspect of the mechanism is involved in clearing the needles to full height?

<p>The butts passing over cardigan cams (C)</p> Signup and view all the answers

Which type of circular knitting machine is suitable for producing rib knit and similar stitches?

<p>Double-cylinder knitting machine. (B)</p> Signup and view all the answers

What is the primary function of the top and bottom stop motions in a circular knitting machine?

<p>To support yarn and stop the machine on a fault. (D)</p> Signup and view all the answers

Which components of a circular knitting machine can stop the machine due to faults like yarn slubs?

<p>The spring-loaded detector points. (A)</p> Signup and view all the answers

How does the tape positive feed in a circular knitting machine function?

<p>By adjusting speed for different course lengths. (D)</p> Signup and view all the answers

What role does the automatic lubrication system play in a circular knitting machine?

<p>It lubricates various moving parts. (A)</p> Signup and view all the answers

What is the purpose of the start, stop, and inching buttons on a circular knitting machine?

<p>To start, stop, and run the machine at slow speed. (D)</p> Signup and view all the answers

Which statement about single-bed knitting machines is correct?

<p>They are designed for jersey and derived stitches. (D)</p> Signup and view all the answers

What is a key characteristic of V-bed knitting machines?

<p>They are fully automated and electronically controlled. (D)</p> Signup and view all the answers

What component is responsible for raising and lowering the needles on a V-bed knitting machine?

<p>The carriage (A)</p> Signup and view all the answers

Which gauge range is typical for a V-bed knitting machine?

<p>3 to 18 needles per inch (D)</p> Signup and view all the answers

What is one of the benefits of using a V-bed knitting machine in production environments?

<p>They can be networked for centralized control. (B)</p> Signup and view all the answers

What kind of needles are typically used in V-bed knitting machines?

<p>Latch needles (B)</p> Signup and view all the answers

What does the yarn guide do in a V-bed knitting machine?

<p>It maintains the path of the yarn. (C)</p> Signup and view all the answers

What range of yarn weights is associated with the yarn packages used in V-bed knitting machines?

<p>2.5 - 6.25 lbs (C)</p> Signup and view all the answers

Which component of the V-bed knitting machine is responsible for linking the two cam systems?

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

What happens during the drop-off process in knitting?

<p>The newly formed course of loops drops off onto the knocking-over bits. (B)</p> Signup and view all the answers

At what position does the needle bar reach its lowest point during the knitting process?

<p>During the completion of knock-over. (D)</p> Signup and view all the answers

What is unique about the bed arrangement of a V-bed knitting machine?

<p>The beds are arranged in a 'V' configuration. (A)</p> Signup and view all the answers

Which of the following describes rib gaiting in V-bed machines?

<p>Needles interact at the apex of the V shape. (B)</p> Signup and view all the answers

What is the primary function of the carriage or CAM box in a knitting machine?

<p>To select needles and traverse across the needle beds. (B)</p> Signup and view all the answers

Which type of machine uses a V-bed configuration?

<p>V-bed rib machine. (D)</p> Signup and view all the answers

What is a key feature of flatbed purl machines?

<p>They have horizontal needle beds. (D)</p> Signup and view all the answers

How does the fabric move away from the V-bed knitting machine?

<p>It is pulled down by the take down system. (B)</p> Signup and view all the answers

What is the function of the lint blower in the fabric production process?

<p>To reduce knitted-in lint slubs and cross contamination (C)</p> Signup and view all the answers

Which device is responsible for providing a positive feed of yarn to the knitting needles?

<p>MPF Device (A)</p> Signup and view all the answers

What role does the driven pulley play in the operation of the MPF?

<p>It controls the speed of the MPF (B)</p> Signup and view all the answers

What is the purpose of the stopper in the MPF system?

<p>To signal when yarn is broken (C)</p> Signup and view all the answers

Which component is used to hold the yarn cone in a vertical position?

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

What function does the yarn tensioner serve in the knitting process?

<p>It ensures appropriate gripping of yarn (C)</p> Signup and view all the answers

What is the purpose of the revolution counters in the fabric winding mechanism?

<p>To count fabric shifts and stop the machine accurately (C)</p> Signup and view all the answers

How does the aluminium telescopic tube support the yarn during knitting?

<p>It protects the yarn from friction and contaminants (B)</p> Signup and view all the answers

What is the purpose of the clearing action in the knitting process of a circular machine?

<p>To remove old loops formed in the previous cycle (A)</p> Signup and view all the answers

During the yarn feeding process, what happens to the needles?

<p>They move to cover the old loops with open latches (B)</p> Signup and view all the answers

Which of the following indicates that a machine is not cylinder revolving?

<p>It can produce complex knitting structures (A)</p> Signup and view all the answers

What distinguishes the knocking-over action in circular knitting machines?

<p>The cylinder needle retracts before the dial needle (A)</p> Signup and view all the answers

How do machines like garment length machines differ from other circular machines?

<p>They utilize CAM box revolving due to their complexity (B)</p> Signup and view all the answers

What distinguishes circular knitting machines from flat knitting machines?

<p>Circular machines produce fabric in a tubular form. (D)</p> Signup and view all the answers

Which knitting technique allows for complex fabric patterns to be created?

<p>All mentioned methods (C)</p> Signup and view all the answers

What is a key feature of garment-length machines?

<p>They include straight bar frames and hosiery machines. (B)</p> Signup and view all the answers

Which type of knitting machine is primarily utilized for production efficiency?

<p>Large diameter circular machines (C)</p> Signup and view all the answers

What describes the function of the timing or counting device in garment-length machines?

<p>It initiates garment-length knitting sequences. (C)</p> Signup and view all the answers

How is fabric production generally separated in weft knitting machines?

<p>By grouping into circular and flat machines (B)</p> Signup and view all the answers

What is a common characteristic of single jersey knitting machines?

<p>They are circular machines with a single needle cylinder. (D)</p> Signup and view all the answers

What kind of fabric do large diameter, circular, latch needle machines produce?

<p>High-speed knitted fabrics that are cut into rolls. (C)</p> Signup and view all the answers

What is the maximum width of machine gauge that can be associated with V-bed knitting machines?

<p>79 inches (C)</p> Signup and view all the answers

Which component of a V-bed knitting machine raises and lowers the needles?

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

Which type of needles are typically utilized in V-bed knitting machines?

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

What is the primary function of the cam system in a V-bed knitting machine?

<p>To control needle movement (C)</p> Signup and view all the answers

What is one of the benefits of using modern V-bed knitting machines in production environments?

<p>Networking capabilities (B)</p> Signup and view all the answers

What range of yarn counts can be knitted on V-bed knitting machines?

<p>Finer to coarser yarns (C)</p> Signup and view all the answers

What feature allows V-bed knitting machines to effectively change machine gauge?

<p>Interchangeable cam systems (A)</p> Signup and view all the answers

What type of control and display technology is integrated into V-bed knitting machines?

<p>On-board LCD monitor displays (D)</p> Signup and view all the answers

What mechanism allows circular knitting machines to operate continuously without needing to stop during knitting?

<p>The unidirectional movement of the CAM system (C)</p> Signup and view all the answers

During one revolution of the CAM system in a circular knitting machine with eight systems, how many courses of fabric are completed?

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

What determines the maximum number of CAM systems that can be installed around a circular knitting machine?

<p>The circumference of the needle cylinder (D)</p> Signup and view all the answers

What is a significant difference between the CAM systems of a single jersey machine and a double jersey machine?

<p>The moments generated for knitting (B)</p> Signup and view all the answers

Which of the following statements is true regarding the operation of multi-system circular knitting machines?

<p>Each system can be programmed to knit different patterns simultaneously. (C)</p> Signup and view all the answers

What is the relationship between the number of CAM systems and the production rate of fabric in a circular knitting machine?

<p>More CAM systems increase the number of fabric courses produced per revolution. (C)</p> Signup and view all the answers

What happens when the CAM systems on a circular knitting machine move together?

<p>Multiple courses of fabric are knitted simultaneously. (C)</p> Signup and view all the answers

In circular knitting, what is the primary role of the winding roller?

<p>To wrap the fabric into layers during production. (C)</p> Signup and view all the answers

What mechanism allows the yarn carriers to move in a straight bar knitting machine?

<p>An oscillating draw lever (D)</p> Signup and view all the answers

How does the length of the straight bar machine affect the knitting process?

<p>It allows for more knitting heads to operate separately. (C)</p> Signup and view all the answers

What characteristic is notable about the quality of garments produced by straight bar knitting machines?

<p>They are typically low in fabric tension. (B)</p> Signup and view all the answers

What is the role of the sinker in the straight bar knitting machine?

<p>To help form loops by catching yarn around the needles. (B)</p> Signup and view all the answers

What is an advantage of using variable draw in straight bar knitting machines?

<p>To adjust knitting width for different fabric types. (D)</p> Signup and view all the answers

What feature limits the applicability of straight bar knitting machines in current fashion trends?

<p>Their limited knitting width. (B)</p> Signup and view all the answers

What component is essential for the functioning of bearded needle in straight bar knitting machines?

<p>Drilled needle bar (B)</p> Signup and view all the answers

Which factor affects the number of courses knitted per minute on straight bar knitting machines?

<p>Width of the knitted fabric. (B)</p> Signup and view all the answers

What occurs during the completion of knock-over in the knitting process?

<p>The old course of loops is collectively knocked-over. (B)</p> Signup and view all the answers

How are the needle beds arranged in a V-bed knitting machine?

<p>In a V-shape at an angle of 90° - 104°. (B)</p> Signup and view all the answers

What is the significance of rib gaiting in V-bed knitting machines?

<p>It enables the needles to pass between each other during loop formation. (B)</p> Signup and view all the answers

What is an advantage of using V-bed knitting machines?

<p>Ability to produce racked stitches and needle-out designs. (A)</p> Signup and view all the answers

What function does the catch bar serve during the knitting process?

<p>It releases the sinkers for individual movement. (C)</p> Signup and view all the answers

What feature characterizes flatbed purl (links-links) machines?

<p>They are slower and more specialized. (A)</p> Signup and view all the answers

What happens to the fabric after interactions between the yarn and knitting elements in a V-bed machine?

<p>It moves away downward drawn by the take-down system. (B)</p> Signup and view all the answers

What is the primary role of the carriage or 'CAM box' in V-bed knitting machines?

<p>To traverse across needle beds and select needles. (C)</p> Signup and view all the answers

Flashcards

Knitting Machine

A device used to create knitted fabrics, ranging from simple to highly complex and electronic.

Knitted Fabrics

Fabrics produced by interlooping yarn.

Circular Knitting Machine

Knitting machines that create tubular fabric in a continuous length.

Flat Knitting Machine

Knitting machines that produce flat fabric.

Signup and view all the flashcards

Garment-Length Machine

Machines used to knit fabrics for garments.

Signup and view all the flashcards

Circular Machines

Knitting machines for fabric or parts of garments that use a revolving cylinder.

Signup and view all the flashcards

Pattern Stitches

Stitches selected by hand, buttons, dials, punches, or electronic devices.

Signup and view all the flashcards

Weft Knitting Machines

Knitting machines categorized by the end product, like circular or flat machines.

Signup and view all the flashcards

Drop-off stage

The stage in the knitting process where newly formed loops detach from the needles.

Signup and view all the flashcards

Knock-over (f) stage

In knitting, the stage where old loops are removed from the needles.

Signup and view all the flashcards

Holding-down stage

The stage of the knitting process where the fabric is held in place after the fabric is formed.

Signup and view all the flashcards

Flatbed Purl Machine

A type of flat knitting machine with horizontal needle beds, using double-headed latch needles.

Signup and view all the flashcards

V-bed rib machine

A common type of flat knitting machine with needle beds in a 'V' shape, used for rib-knitting.

Signup and view all the flashcards

Rib Gating

A needle arrangement in V-bed machines that allows needles to pass between each other during loop formation.

Signup and view all the flashcards

Flat Knitting Machine Types

Two types are the slower purl or links-links machine and the widely used V-bed rib machine.

Signup and view all the flashcards

V-bed Machine Stitch Potential

V-bed machines can produce a variety of stitches including needle selections, racked stitches, needle-out designs, striping and changing knit width.

Signup and view all the flashcards

Rest Position

The starting position of the needles where their tops are level with the 'knock-over' bits and the butts are in a straight line.

Signup and view all the flashcards

Raising Cams (R)

Cams that lift the needle butts, initiating the knitting process by raising them to a height where the hook can be tucked in.

Signup and view all the flashcards

Leading & Trailing Stitch Cams (S & AS)

Cams that control the movement of needles during knitting. Leading cams raise the needles, while trailing cams lower them.

Signup and view all the flashcards

Alternating Action

The pattern of cam movement where the leading cams raise while trailing cams lower, and vice versa. This prevents strain on the old loops.

Signup and view all the flashcards

Clearing Height

The full height the needle reaches during the knitting process, allowing for the old loop to be cleared and the new loop to be formed.

Signup and view all the flashcards

Guard Cams (G)

Cams that guide the yarn as the needles descend and ensure the correct loop length is drawn.

Signup and view all the flashcards

Knocking-Over Action

The process of transferring the old loop from one needle to another, forming the knit stitch. Synchronized knocking-over occurs in both needle beds.

Signup and view all the flashcards

Delayed Timing

A technique where the knock-over action in the front bed occurs after the back bed. It's used for finer gauges, but not broad ribs.

Signup and view all the flashcards

V-bed knitting machines

Versatile weft knitting machines, highly automated and electronically controlled, used for making garments or panels.

Signup and view all the flashcards

Needle bed length

The length of the needle bed on a V-bed knitting machine, varying from 1.0 m to 2.2 m, designed for specific tasks.

Signup and view all the flashcards

Latch needles

The type of needles used in V-bed knitting machines.

Signup and view all the flashcards

Bi-directional cam system

A system featuring angular cams on a V-bed knitting machine employed for pattern creation.

Signup and view all the flashcards

Machine gauge (V-bed)

The number of needles per inch (3-18) and machine width (up to 79 inches) on a V-bed machine.

Signup and view all the flashcards

Yarn counts in V-bed machines

V-bed knitting machines can handle a wide range of yarn counts (finer to coarser) with multiple yarn ends per knitting system and stitch length, adaptable and changeable.

Signup and view all the flashcards

Yarn package types

Yarn packages for V-bed machines can be cones or cheeses with different weights (2.5-6.25lbs for regular yarn and 8-10lbs for filament yarn) depending on yarn type.

Signup and view all the flashcards

Yarn guide function

A component that maintains the yarn path on the V-bed knitting machine.

Signup and view all the flashcards

Large-diameter Circular Knitting Machines

Circular knitting machines with diameters ranging from 24 to 40 inches. These machines are well-suited for producing large-sized fabrics or garments.

Signup and view all the flashcards

Medium-diameter Circular Knitting Machines

Circular knitting machines with diameters between 8 to 22 inches. They are versatile and used for a wide range of fabric production.

Signup and view all the flashcards

Small-diameter Circular Knitting Machines

Circular knitting machines with diameters ranging from 3 to 6 inches. They are ideal for producing small knitted items like socks, gloves, or hats.

Signup and view all the flashcards

Single-bed Circular Knitting Machine

A circular knitting machine with one needle bed. It produces jersey fabric and variations like fleece, terry cloth, and piquet.

Signup and view all the flashcards

Double-bed Circular Knitting Machine

A circular knitting machine with two needle beds. It offers more stitch possibilities, including rib knit, interlock, and jacquard.

Signup and view all the flashcards

Dial-cylinder Knitting Machine (90°)

A type of double-bed circular knitting machine with needle beds positioned at a 90-degree angle. It produces rib knit and related stitches like cardigan, milanese, and cable.

Signup and view all the flashcards

Double-cylinder Knitting Machine (180°)

A double-bed circular knitting machine with needle beds positioned at a 180-degree angle. It produces stitches based on the links-links construction, which creates a unique fabric structure.

Signup and view all the flashcards

Stop Motion

A yarn break detection system on a circular knitting machine. It stops the machine when yarn breaks or tension increases, preventing fabric defects.

Signup and view all the flashcards

Creel

A vertical aluminum stick used to hold yarn cones in knitting machines.

Signup and view all the flashcards

Cone Holder

An inclined metallic stick designed to hold yarn cones for easy feeding to the knitting machine.

Signup and view all the flashcards

Aluminium Telescopic Tube

A tube that guides yarn from the cone holder to the MPF device, protecting it from friction, dust, and fly fibers.

Signup and view all the flashcards

MPF Device

Memminger Positive Feed device, which receives yarn from the telescopic tube and provides uniform tension to the needles, preventing machine stoppage and detecting yarn breaks.

Signup and view all the flashcards

Winding Wheel

A small wheel that holds some yarn from the cone, allowing quick replacement if yarn breaks, preventing rewinding the whole cone.

Signup and view all the flashcards

Yarn Tensioner

A device that controls the yarn tension to ensure the appropriate amount of yarn grip during knitting.

Signup and view all the flashcards

Stopper

A part of the MPF device that detects yarn breaks and signals the machine to stop, reducing fabric defects.

Signup and view all the flashcards

Driven Pulley

A pulley connected to the MPF device that controls its speed, which affects the yarn feeding rate and fabric knitting speed.

Signup and view all the flashcards

Knitting Machine Types

Knitting machines can be categorized by their end product: circular machines for tubular fabrics, flat machines for flat fabrics, and garment-length machines for knitwear.

Signup and view all the flashcards

Fabric Machines

High-speed circular knitting machines that produce large amounts of fabric, usually in roll form.

Signup and view all the flashcards

Single Jersey

A knit fabric made with a single set of needles, creating a smooth, non-reversible surface.

Signup and view all the flashcards

Double Jersey

A knit fabric made with two sets of needles, creating a more textured, reversible fabric.

Signup and view all the flashcards

Straight Bar Knitting Machine

A type of bearded needle weft knitting machine known for producing high-quality garments, but limited in knitting width and shaping capabilities. It is still commercially viable, but faces competition from electronically controlled flat machines.

Signup and view all the flashcards

Draw Cam

A cam attached to a shaft set at right angles to the main camshaft, responsible for the sideways reciprocating movement of yarn carriers and sinkers in a straight bar knitting machine.

Signup and view all the flashcards

Variable Draw

A system that ensures the stroke of the draw cam is related to the knitting width, allowing for more courses per minute on narrower widths.

Signup and view all the flashcards

Knitting Heads

Sections or divisions of a straight bar knitting machine, where each head is capable of knitting a separate but identically-dimensioned garment panel.

Signup and view all the flashcards

Bearded Needle

A needle type used in straight bar knitting machines, having a cranked end for location in the needle bar.

Signup and view all the flashcards

Sinker

A component in a straight bar knitting machine, located between every other needle space, responsible for sinking the yarn around the needles and separating the old and new loops.

Signup and view all the flashcards

Divider

A component in a straight bar knitting machine, located in the remaining spaces between the needles, with a similar front shape to the sinker but with an extended tail.

Signup and view all the flashcards

Parts of Straight Bar Knitting Machine

Components include bearded needles, sinkers, and dividers - each contributing to the unique knitting process of this machine.

Signup and view all the flashcards

Drop-off

When the needle bar moves away from the pressing-edge, the sinkers and dividers withdraw, allowing the newly-formed loops to drop onto the knocking-over bits.

Signup and view all the flashcards

Knock-over (f)

As the needle bar descends, the old loops are collectively knocked over by the heads descending below the belly of the knocking-over bits.

Signup and view all the flashcards

Holding-Down

After the loop formation, the sinkers and dividers move forward to hold down the fabric. The catch bar is raised to prepare for the next course of loops.

Signup and view all the flashcards

Machine Gauge

The measure of density of needles on a V-bed machine, expressed as needles per inch (3-18) and machine width (up to 79 inches).

Signup and view all the flashcards

Yarn Counts

The thickness of yarn used on a V-bed machine, ranging from finer to coarser, offering flexibility in fabric texture.

Signup and view all the flashcards

Yarn Guide

A component that ensures the yarn follows a specific path, preventing tangles and maintaining consistent tension.

Signup and view all the flashcards

On-board Computer and LCD Monitor

Modern V-bed machines have a built-in computer and monitor, controlling the knitting process and displaying information.

Signup and view all the flashcards

Circular Knitting Machine Types

Circular knitting machines can revolve around a cylinder or a CAM box. Cylinder revolving machines are used for simpler fabrics, while CAM box revolving machines are used for more complex structures with multiple feeds.

Signup and view all the flashcards

Clearing Position

The stage in the knitting process where the cylinder and dial needles move out to clear the loops formed in the previous cycle, preparing for the next set of loops.

Signup and view all the flashcards

Yarn Feeding

The stage where the needles retract into their tricks, allowing the old loops to be covered by the open latches and the new yarn to be fed into the open hooks.

Signup and view all the flashcards

Knocking-over

The process where the old loops are removed from the needles and the new loops are drawn through them, forming the knit stitch.

Signup and view all the flashcards

Knitting Action Steps

The knitting action of a circular machine involves three main steps: clearing, yarn feeding, and knocking-over. These steps are repeated to create the fabric.

Signup and view all the flashcards

Winding Roller

A roller located under the take-down motion rollers that rolls the fabric. It moves upward as it accumulates fabric layers.

Signup and view all the flashcards

CAM System

The mechanism in a circular knitting machine that controls the movement of needles and sinkers, similar to the carriage on a flatbed machine. It's a continuous process without stopping for each row.

Signup and view all the flashcards

Multi-system Circular Knitting

A circular knitting machine with multiple CAM systems, each knitting a separate course simultaneously. This allows for faster fabric production.

Signup and view all the flashcards

Cylinder & Dial

The two needle beds in a double jersey circular knitting machine, positioned at a 90-degree angle to each other, enabling the creation of rib knit and other complex stitches.

Signup and view all the flashcards

Study Notes

Introduction to Knitting Machines

  • A knitting machine creates knitted fabrics, semi- or fully automated.
  • Numerous types exist, ranging from simple non-mechanical to complex electronic.
  • All create single jersey or complex jacquard fabrics, either flat or tubular.
  • Patterns are selected by needle manipulation or electronically.
  • Machines vary in production capacity, from high to low output.

Weft Knitting Machines by End Product

  • Grouped according to end product:
    • Circular machines: Knit tubular fabric with continuous, uninterrupted length and constant width.
    • Flat and circular machines: Knit garment-length sequences, utilize timing/counting devices to initiate additional garment length programming (controlling machine action).
    • Fabric machines: Large diameter, circular latch needle machines knit fabrics at high-speed. Fabrics are manually cut and wound after a designated length.
    • Garment length machines: Straight bar frames, flats, hosiery, leg wear, glove machines, circular garment machines & sweater strip machines produce knitwear and outerwear. Garment sequence control with timing/counting devices initiates alterations to other parts of the machine to knit to a garment-length sequence (versus continuous fabric).

Weft Knitting Machines by Frame Design & Needle Bed Arrangement

  • Three main groups: straight bar frames, flat, circular.
  • Classified by frame design and needle arrangements, (straight line/flat bar or circular cylinder).
  • Machines can produce single jersey, not double jersey fabrics, using knit, miss, or tuck stitch combinations.
  • Double jersey fabrics, like rib and interlock, are produced on both flat bar and circular machines.

Straight Bar Knitting Machine

  • Specific type of machine with vertical bar of bearded needles.
  • Movement controlled by circular engineering cams attached to a revolving camshaft in the base of the machine.
  • Three directions of motion (vertical & horizontal needle bar movement) from two separate sources.
  • Rotary motion of camshaft provides vertical & horizontal needle bar movement.
  • Variable draw ensures different knitting widths.
  • High-speed, highly productive, but expensive machines used for limited, narrow fashion garment manufacture.
  • Relatively low fabric tension and gentle knitting action produce high-quality garments.

Parts of Straight Bar Knitting Machine

  • Bearded needle: Cranked end for locking in the drilled needle bar.
  • Sinker: Reinforces back and front with a 'catch' to sink yarn around needles, and a 'neb' to separate loops.
  • Divider: Shape similar to sinker but with an extended back tail.
  • Knocking-over bit: Located directly beneath the sinker and divider.
  • Needle bar: Compound horizontal/vertical movement.
  • Striking jack: Fulcrummed at its lower end, pressing on the sinker’s back.
  • Catch bar: Used to move sinkers and dividers in forward/backward direction.
  • Yarn carrier: Moves in alternate directions across knitting head using reciprocating carrier rail.

Knitting Action of Straight Bar Knitting Machine

  • Sinking: Loop formation around adjacent needles.
  • Dividing: Dividing loops into equal-sized needle loops.
  • Pressing: New loops are placed inside beard hooks for each needle.
  • Landing: Positioning of previously completed loops on knock-over bits.
  • Drop-off: Release of loops from the sinker onto knock-over bits.
  • Complete knock-over: Release of cycles onto knocking-over slots and lowering of fabric.
  • Holding-down: Holding fabric and setting the placement of the next loops.

Flat Knitting Machine

  • Two types:
    • Flatbed purl (links-links): Horizontal needle beds, using double headed latch needles.
    • V-bed rib machine: Two opposing needle beds arranged in a 'V' configuration.

V-Bed Knitting Machine

  • Two rib gated needle beds.
  • Needles pass between in a V-configuration during loop creation;
  • Fabric knit at apex of the V shape, moves downwards between beds.
  • Versatile, for a wide variety of knitting with good performance characteristics.

Circular Knitting Machine

  • Needle beds arranged as circular cylinders/dials.
  • Fabric knitted as a seamless tube.
  • Production of many garments, hosiery, and other fabric types and sizes.
  • Highly engineered and electronically controlled for high speed and quality.
  • Different sizes/diameters available (large, medium, small)
  • Some machines use single needle beds, some use two, depending on complexity and type of fabric to be knit.

Parts of Circular Knitting Machine

  • Detailed descriptions of many mechanical parts of a circular knitting machine are provided.

Automatic Needle Detector and Fabric Detector

  • Detects whether needles are broken or damaged or fabric is torn.
  • Fabric detector signals machine stoppage if needed.

Manual Jig and Gate

  • Manual jig adjusts sinker, needle, and other elements.
  • Gate covers knitted fabric to protect it.

CAM System of Circular Knitting Machine

  • Same as flat bed machines, but continuous.
  • CAM system is critical for controlling the moment of multiple sets of needles.
  • CAM systems allows for production of different types of fabrics and stitches.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Related Documents

Weft Knitting Machines PDF

Description

Explore the various types of knitting machines used in fabric production. This quiz covers their functionality, types, and the categorization based on end products. Test your knowledge on how these machines operate and their production capabilities.

More Like This

Machine Knitting
9 questions

Machine Knitting

Quizgecko avatar
Quizgecko
Circular Knitting Machine Basics
10 questions

Knitting Machine Basics: Circular Knitting Essentials

BelovedDarmstadtium avatar
BelovedDarmstadtium
Machines Rectilignes Manuelles
48 questions

Machines Rectilignes Manuelles

StrongerBinary3641 avatar
StrongerBinary3641
Raschel Machines Overview
16 questions

Raschel Machines Overview

SimplestSaxhorn avatar
SimplestSaxhorn
Use Quizgecko on...
Browser
Open
Browser
Browser