Knitting Machine Elements

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Questions and Answers

What is the primary function of the sinker in knitting machines?

  • To control yarn tension
  • To form loops (correct)
  • To provide needle support
  • To assist in yarn feeding

Which element is considered the main element of a knitting machine?

  • Knitting Needle (correct)
  • Needle Bed
  • Sinker
  • Cams

Which is NOT a function performed by sinkers in knitting machines?

  • Loop formation
  • Yarn feeding (correct)
  • Knocking-over
  • Holding-down

Which part of the sinker prevents old loops from being lifted as needles rise?

<p>Protruding nib or nose (C)</p> Signup and view all the answers

In which types of knitting machines is loop formation NOT a function of the sinkers?

<p>Latch needle weft knitting machines (C), Warp knitting machines (D)</p> Signup and view all the answers

What does the term 'knocking-over' refer to in the context of sinkers?

<p>Shifting old loops (D)</p> Signup and view all the answers

The butts of sinkers are relevant for which of the following?

<p>Connecting to the needle bed (C)</p> Signup and view all the answers

Which of the following components is NOT a basic component of knitting machines?

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

What is the primary function of the knock-over sinker in knitting?

<p>It supports the old loop while forming the new loop. (B)</p> Signup and view all the answers

What is the purpose of the jack in knitting technology?

<p>To enhance versatility of latch needle selection. (B)</p> Signup and view all the answers

What defines engineering cams in knitting machines?

<p>They control the motion of single units within the machine. (C)</p> Signup and view all the answers

Which type of cam directly affects the butts of needles in knitting machines?

<p>Knitting cams (A)</p> Signup and view all the answers

What type of cam is characterized by its profile that produces precisely-timed movements?

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

What are knitting cams primarily made of?

<p>Solid steel plates (A)</p> Signup and view all the answers

Which of the following is NOT a type of knitting cam?

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

In warp knitting machines, which cam type is specifically mentioned?

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

What is the primary function of knitting cams in a knitting machine?

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

In what type of knitting machine do needle butts pass through a stationary cam system?

<p>Revolving cylinder machines (C)</p> Signup and view all the answers

Which cam system is NOT part of the needle cam system?

<p>Sinker-return cam (D)</p> Signup and view all the answers

What happens to the yarn feed position during weft knitting?

<p>It is fixed in relation to the cam system (D)</p> Signup and view all the answers

Which cam can be adjusted to change the stitch length in a knitting machine?

<p>Up-throw cam (A)</p> Signup and view all the answers

Which component is part of the sinker cam system?

<p>Sinker withdrawing cam (C)</p> Signup and view all the answers

What is the relationship between the cam system and the yarn packages in flat machines?

<p>The cam carriage reciprocates away from the yarn packages (C)</p> Signup and view all the answers

Which of the following components is NOT found in the needle cam system?

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

What is the main function of the rising cam in a knitting machine?

<p>To lift the needles to a certain height. (A)</p> Signup and view all the answers

What happens when the stitch cam is raised?

<p>Shorter loops are drawn, resulting in tighter fabric. (B)</p> Signup and view all the answers

What is the purpose of the return cam in the sinker system?

<p>To synchronize the sinkers with needle movement. (C)</p> Signup and view all the answers

Which cam is used specifically to withdraw the sinker from the knitting action?

<p>Sinker withdrawing cam (C)</p> Signup and view all the answers

How does the guard cam function in a knitting machine?

<p>It helps prevent needles from falling out of track. (D)</p> Signup and view all the answers

What is achieved by the up-throw or counter cam?

<p>It keeps the needle butts at a low level. (B)</p> Signup and view all the answers

What does the race cam do in a knitting machine?

<p>It brings the sinker into the knitting action. (B)</p> Signup and view all the answers

Which statement best describes the function of the stitch cam?

<p>It allows loop formation through vertical movement. (C)</p> Signup and view all the answers

What is the primary function of a sinker-return cam in knitting machines?

<p>To push the sinker and prepare it for the next action (A)</p> Signup and view all the answers

How do cam systems generate displacements for different knitting machines?

<p>By creating both needle and sinker displacements for sinker machines (A)</p> Signup and view all the answers

What is the role of the needle bed in a knitting machine?

<p>To ensure the needles and sinkers are at exact defined distances (D)</p> Signup and view all the answers

Which of the following describes the engaged position of the sinker track during knitting?

<p>When the needle is clearing (C)</p> Signup and view all the answers

What type of needle bed is categorized as a flat needle bed?

<p>Single needle bed flat (D)</p> Signup and view all the answers

During the yarn feeding process in circular weft knitting machines, which statement is true?

<p>Needles move past a stationary yarn feed (B)</p> Signup and view all the answers

Which statement accurately describes the three-stage needle displacement?

<p>Comprises raising, lowering, and guard cams (C)</p> Signup and view all the answers

What distinguishes a double needle bed from a single needle bed?

<p>The number of needles it accommodates (A)</p> Signup and view all the answers

Flashcards

Sinker

A thin metal plate that helps form knit loops, often by holding down old loops.

Sinker function: loop formation

The sinker helps needles create new knit loops, pushing yarn into place.

Sinker function: Holding-down

Sinkers hold down old loops so new loops don't get mixed up.

Knitting Needle

The main part of a knitting machine that does the actual knitting.

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Sinker parts: Butt

The base part of the sinker.

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Sinker parts: Height of shank

The vertical distance of the sinker's supporting structure.

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Sinker parts: Neb

The protruding section of a sinker, used for holding loops.

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Sinker parts: Clearance

Space between the sinker and other parts of the machine in knitting process.

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Sinker's knock-over function

The sinker's upper surface supports the old loop while a new loop is drawn through it.

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Jack (in knitting)

A secondary knitting element that allows for varied latch needle selection and movement.

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Cam (in knitting)

Device that transforms rotary machine motion into reciprocating motion for needles and elements.

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Engineering cam

Circular cam controlling the movements of units in a cotton or warp knitting machine.

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Knitting cam

Angular cam affecting individual needle or element movements in latch needle machines.

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Knit cam

Knitting cam type that creates knit stitches in the fabric.

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Tuck cam

Knitting cam that makes tuck stitches in the fabric.

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Miss cam

Knitting cam that skips or misses stitches within the fabric.

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Rising Cam

The cam that lifts the needles to a specific height for actions like tucking, clearing, or transferring loops.

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Stitch Cam

The cam that controls the downward movement of the needles, determining the yarn loop length and acting as a knock-over cam.

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Up-throw Cam

This cam brings the needles back to their resting position, allowing new loops to relax.

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Guard Cam

A cam that prevents needles from falling out of their track by limiting the movement of their butts.

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Return Cam

A cam in the sinker ring that moves the sinker back and forth in synchronization with the needle timing.

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Sinker Withdrawing Cam

The cam that pulls the sinker out of the knitting action once the loop is formed.

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What does the stitch cam control?

The stitch cam controls the downward movement of the needles, determining the yarn loop length and acting as a knock-over cam.

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Sinker-return cam

A cam that pushes the sinker to prepare it for the next knitting action.

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Latch Needle Movement

The way latch needles move on a knitting machine to create knit loops. It involves different steps like clearing, stitching, and returning.

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Cam systems

Mechanisms that control both needle and sinker movements in knitting machines.

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Angular Knitting Cam

A type of cam that directly moves needles on circular knitting machines. It can create different stitch patterns.

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Needle Bed

The base that holds needles and sinkers in place, ensuring proper distance and alignment during knitting.

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Circular needle bed

A needle bed shaped like a circle, used in circular knitting machines.

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Revolving Cylinder Machines

A type of circular knitting machine where the needles move through a stationary cam system. The fabric revolves as it's being knit.

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Rotating Cam-box Circular Machines

A type of circular knitting machine where the cams move across a stationary needle bed. The needles stay in place.

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Flat needle bed

A needle bed shaped like a flat surface, used in flat knitting machines.

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Single needle bed

A needle bed with a single row of needles, used for simple knitting.

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Needle Cam System

A group of cams that control the movement of knitting needles. It includes cams for clearing, stitching, raising, and returning.

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Sinker Cam System

A group of cams that control the movement of sinkers in a knitting machine. It helps shape the knit loops by holding down old loops.

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Double needle bed

A needle bed with two rows of needles, used for creating double-layered fabrics.

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Yarn feeding

The process of supplying yarn to the knitting needles.

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Stitch Length Adjustment

The ability to change the size of the knit loops by moving the needle and sinker cam systems. This affects the overall tightness or looseness of the fabric.

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Study Notes

Knitting Elements

  • The basic elements of knitting machines include: knitting needles, the sinker, the jack, cams, and the needle bed, and yarn feeding.

The Sinker

  • The sinker is the second primary knitting element (after the needle).
  • It's a thin metal plate that operates approximately at right angles from the hook side of the needle bed, between adjacent needles.
  • Its actions are dependent on the machine, and can include; loop formation, holding-down, and knocking-over.

Parts of the Sinker

  • The main parts of a sinker include: butt, butt breadth, height of shank, bulge, length of neb, throat angle, sinker platform height, breadth of lower shank, clearance, and throat.

The Cam

  • All knitting machines use cams to convert rotary motion into reciprocating motion for needles.
  • Cams are carefully designed to produce precise movements.
  • Cam movements can be graphed to represent timing.

Types of Cams

  • Cams can be circular (engineering), or knitting cams.
  • Engineering cams control the motion of elements, such as the bars of knitting machine.
  • Knitting cams act on needle butts, for individual or serial movement, in latch needle weft knitting machines.
  • Several different types of cams for knitting exist, including single acting, cam & counter cams, box cams, and contour cams.

Knitting Cams

  • Knitting cams are solid steel plates.
  • Each needle movement can be achieved through cams.
  • Cams can be fixed, exchangeable, or adjustable depending on the machine.

The Needle Cam System

  • The needle cam system includes clearing/rising cams, stitch/lowering cams, up-throw/counter/running cams, guard cams, and return cams.

The Sinker Cam System

  • Components within the sinker cam system include, the race cam, the sinker-withdrawing cam, and the sinker return cam.

The Needle Bed

  • The structure of the needle bed depends on the type of knitting machine.
  • Used to hold needles and sinkers at a designated position and guide their movements during stitch formation.
  • Two types of needle beds exist: circular and single. Additional types include double, and flat.

Yarn Feeding

  • Two primary methods exist for yarn feeding: moving the needles past a stationary yarn feed, or moving the yarn past a stationary needle bed.
  • Circular weft machines typically feature revolving cylinders, accompanied by stationary cams and feeders.
  • Warp knitting machines often feature stationary needle beds, with yarn moving past them.

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