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?

Protruding nib or nose Signup and view all the answers

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

Latch needle weft knitting machines Signup and view all the answers

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

Shifting old loops Signup and view all the answers

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

Connecting to the needle bed Signup and view all the answers

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

Loop Maker Signup and view all the answers

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

It supports the old loop while forming the new loop. Signup and view all the answers

What is the purpose of the jack in knitting technology?

To enhance versatility of latch needle selection. Signup and view all the answers

What defines engineering cams in knitting machines?

They control the motion of single units within the machine. Signup and view all the answers

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

Knitting cams Signup and view all the answers

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

Engineering cam Signup and view all the answers

What are knitting cams primarily made of?

Solid steel plates Signup and view all the answers

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

Drive cam Signup and view all the answers

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

Box cams Signup and view all the answers

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

To produce needle movement through the needle butt Signup and view all the answers

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

Revolving cylinder machines Signup and view all the answers

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

Sinker-return cam Signup and view all the answers

What happens to the yarn feed position during weft knitting?

It is fixed in relation to the cam system Signup and view all the answers

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

Up-throw cam Signup and view all the answers

Which component is part of the sinker cam system?

Sinker withdrawing cam Signup and view all the answers

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

The cam carriage reciprocates away from the yarn packages Signup and view all the answers

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

Race cam Signup and view all the answers

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

To lift the needles to a certain height. Signup and view all the answers

What happens when the stitch cam is raised?

Shorter loops are drawn, resulting in tighter fabric. Signup and view all the answers

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

To synchronize the sinkers with needle movement. Signup and view all the answers

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

Sinker withdrawing cam Signup and view all the answers

How does the guard cam function in a knitting machine?

It helps prevent needles from falling out of track. Signup and view all the answers

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

It keeps the needle butts at a low level. Signup and view all the answers

What does the race cam do in a knitting machine?

It brings the sinker into the knitting action. Signup and view all the answers

Which statement best describes the function of the stitch cam?

It allows loop formation through vertical movement. Signup and view all the answers

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

To push the sinker and prepare it for the next action Signup and view all the answers

How do cam systems generate displacements for different knitting machines?

By creating both needle and sinker displacements for sinker machines Signup and view all the answers

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

To ensure the needles and sinkers are at exact defined distances Signup and view all the answers

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

When the needle is clearing Signup and view all the answers

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

Single needle bed flat Signup and view all the answers

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

Needles move past a stationary yarn feed Signup and view all the answers

Which statement accurately describes the three-stage needle displacement?

Comprises raising, lowering, and guard cams Signup and view all the answers

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

The number of needles it accommodates Signup and view all the answers

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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Description

Explore the fundamental components of knitting machines through this quiz. Learn about essential parts such as the sinker and cams, and their specific functions in the knitting process. Test your knowledge of how these elements work together to create fabric.