The document describes the key features and knitting action of a tricot machine. It discusses how the tricot machine has sinkers that hold down, knock over, and support fabric loops without moving from the needles. The fabric is drawn away from the machine at nearly a right angle to the needle bar. The machine has a simple construction and short yarn path. It is well suited for high-speed production of fine knits using two guide bars that overlap and underlap.
General terms and principles of knitting technology(loop, sinker and needle)Kamrul Hasan
This document contains information about a student group project presentation on knitting technology. The group is named ANGSHUK and contains 6 members studying at Khulna University of Engineering & Technology. The presentation covers general terms and principles of knitting technology, including loops, sinkers, and needles. It also mentions that the standard needle density for knitting is 14 needles per inch. The document expresses appreciation at the end.
THIS COVERS HONEY COMB, BRIGHTON HONEY COMB, HUCK A BACK, DISTORTED THREAD EFFECT AND OTHER WEAVES.. IT IS VERY MUCH USEFUL TO TEXTILE DIPLOMA AND DEGREE STUDENTS
The beating-up mechanism is used in weaving to push the newly inserted weft pick to the fell of the cloth. It consists of a reed fixed to a sley that is given a quick motion towards the fell by cranks connected to a crankshaft. The main parts include the crankshaft, crank, connecting arm, reed cap, reed, sley race, sley, and sleysword. The sley receives a reciprocating motion from the rotating crankshaft via the crank and connecting arm, which pushes the reed and new weft pick to the fell. Some looms use a double beating-up mechanism with two arms to give two blows per
Warp knitting and crochet machines are used to produce a huge range of warp knitted fabrics (warp knits) for clothing, household textiles and technical textiles. Warp knitting machines are either single needle bar machines or double needlebar machines and are available in a wide range of gauges and widths, Modern machines are electronically controlled in terms of patterning, beam let-off and fabric take-up.
This document provides information about the single jersey knitting machine used in the Fabric Manufacturing Technology Lab. It describes the key parts of the machine including the latch needles, cams, sinkers, cylinder, creel, and yarn path. It also provides specifications for the cylinder such as a diameter of 15 inches and gauge of 25. The machine produces plain knitted fabrics and the document aims to provide an understanding of how a single jersey machine functions.
The document discusses limitations of cam shedding systems when weaving designs with high numbers of picks in the repeat. For a 10-pick repeat design, 10 cams would be required, rotating at 1/10 the speed of the crank shaft. This results in a small dwell period of 48 degrees for each pick. As the number of picks increases, the cam contour becomes steeper, reducing the effective force on the follower and requiring higher operating forces. One solution is increasing the cam diameter to reduce the steepness of the cam contour, but this increases power needs and space requirements.
The document provides an overview of looms and loom mechanisms. It discusses the basic components and functions of a loom, including the heald shaft, sley or lay, shuttle, shuttle box, picker, and reed. It describes how these components work together to form fabric by interlacing the warp and weft threads. The passage of materials through a typical loom is also illustrated in a diagram.
The document describes the key features and knitting action of a tricot machine. It discusses how the tricot machine has sinkers that hold down, knock over, and support fabric loops without moving from the needles. The fabric is drawn away from the machine at nearly a right angle to the needle bar. The machine has a simple construction and short yarn path. It is well suited for high-speed production of fine knits using two guide bars that overlap and underlap.
General terms and principles of knitting technology(loop, sinker and needle)Kamrul Hasan
This document contains information about a student group project presentation on knitting technology. The group is named ANGSHUK and contains 6 members studying at Khulna University of Engineering & Technology. The presentation covers general terms and principles of knitting technology, including loops, sinkers, and needles. It also mentions that the standard needle density for knitting is 14 needles per inch. The document expresses appreciation at the end.
THIS COVERS HONEY COMB, BRIGHTON HONEY COMB, HUCK A BACK, DISTORTED THREAD EFFECT AND OTHER WEAVES.. IT IS VERY MUCH USEFUL TO TEXTILE DIPLOMA AND DEGREE STUDENTS
The beating-up mechanism is used in weaving to push the newly inserted weft pick to the fell of the cloth. It consists of a reed fixed to a sley that is given a quick motion towards the fell by cranks connected to a crankshaft. The main parts include the crankshaft, crank, connecting arm, reed cap, reed, sley race, sley, and sleysword. The sley receives a reciprocating motion from the rotating crankshaft via the crank and connecting arm, which pushes the reed and new weft pick to the fell. Some looms use a double beating-up mechanism with two arms to give two blows per
Warp knitting and crochet machines are used to produce a huge range of warp knitted fabrics (warp knits) for clothing, household textiles and technical textiles. Warp knitting machines are either single needle bar machines or double needlebar machines and are available in a wide range of gauges and widths, Modern machines are electronically controlled in terms of patterning, beam let-off and fabric take-up.
This document provides information about the single jersey knitting machine used in the Fabric Manufacturing Technology Lab. It describes the key parts of the machine including the latch needles, cams, sinkers, cylinder, creel, and yarn path. It also provides specifications for the cylinder such as a diameter of 15 inches and gauge of 25. The machine produces plain knitted fabrics and the document aims to provide an understanding of how a single jersey machine functions.
The document discusses limitations of cam shedding systems when weaving designs with high numbers of picks in the repeat. For a 10-pick repeat design, 10 cams would be required, rotating at 1/10 the speed of the crank shaft. This results in a small dwell period of 48 degrees for each pick. As the number of picks increases, the cam contour becomes steeper, reducing the effective force on the follower and requiring higher operating forces. One solution is increasing the cam diameter to reduce the steepness of the cam contour, but this increases power needs and space requirements.
The document provides an overview of looms and loom mechanisms. It discusses the basic components and functions of a loom, including the heald shaft, sley or lay, shuttle, shuttle box, picker, and reed. It describes how these components work together to form fabric by interlacing the warp and weft threads. The passage of materials through a typical loom is also illustrated in a diagram.
This document discusses three main types of knitting needles: bearded needles, latch needles, and compound needles. Bearded needles are the simplest and cheapest type, made from a single piece of metal with a fixed hook. Latch needles are more complex but self-acting, with a movable latch that opens and closes to form loops. Compound needles have a separate sliding element that works with an open hook to form loops without straining the yarn. The document provides details on the features, parts, advantages, and limitations of each needle type.
stiffness,Handle,Drape properties of fabric ,Fabric property TTQC-2AtiqFaysal
This presentation discusses the stiffness, handle, and drape properties of fabrics. It will cover stiffness and how it is tested using machines like the Shirley Stiffness tester. It will also discuss fabric handle properties, the factors that influence handle, and how to measure drape properties using a drape tester to determine the drape coefficient. Relevant apparatus and testing procedures will be explained.
The document introduces various types of special or fancy yarns. It begins by explaining that fancy yarns are produced through spinning, twisting, wrapping and other processes to create unique textures and optical effects. Some types of fancy yarns mentioned include marl yarn, spiral yarn, knop yarn, slub yarn, fasciated yarn, tape yarn, chainette yarn, and ribbon yarns. Each type is then defined and its uses or production process described. The document aims to provide an overview of different specialty yarns beyond basic spun yarns.
This document discusses different types of picking and picking mechanisms used in weaving. It begins with an introduction to picking, which is the process of passing the weft yarn through the warp shed during weaving. It then describes various picking mechanisms including overpicking, underpicking, and cone overpick and underpick mechanisms. The document provides details on how these different mechanisms work to insert the weft yarn through the shed. It concludes with advantages and disadvantages of different weft insertion methods like projectile, rapier, air jet, and water jet looms.
VDQ pulley (Variable Dia for Quality Pulley): It is a very important part of the machine. It controls the quality of the product. Altering the position of the tension pulley changes the G.S.M. of the fabric.
Various tappet loom parts with functionMd Nurunnabi
The document defines and describes the key parts of a tappet loom. A tappet loom uses tappets, which are levers or projections moved by cams, to produce reciprocating motion that allows the loom to weave fabric. The main components of a tappet loom are the warp beam, heddles, shuttle, reed, tappets, and take-up roller. The tappets are connected to treadles and use cam motion to alternately lift the heddles, creating a shed for the shuttle to pass through and weave in the weft thread.
This document is an 11-page lab report on studying a flat bed knitting machine. It includes diagrams of the machine's yarn path, needle beds arranged in a V formation, and cam carriage system. The report describes the machine parts like the needle beds, yarn carriers, and different cams. It explains the knitting action where the needle butts are lifted and lowered by the cam system to transfer stitches and form new loops. The conclusion states that this experiment provided an introduction to flat bed knitting machine operations and settings that could help with industrial applications.
Presentation on Weft Knitting Machine (Single Jersey, Rib & Interlock)Shawan Roy
This document provides an overview of weft knitting machines, including single jersey, rib, and interlock machines. It defines knitting as a process of creating fabric by interlocking loops of yarn and describes the key components and functions of weft knitting machines. The document classifies weft knitting machines based on their frame design, number of needle beds, product type, and basic structure. It also outlines the features and components of single jersey, rib, and interlock circular knitting machines.
Woven fabric is produced by interlacing warp threads that run lengthwise with weft threads that run across. The appearance and properties of woven fabric depend on yarn structure and fabric structure. There are four basic fabric parameters: thread count, yarn diameter, yarn bending, and weaving order. Weaving involves repeatedly raising warp yarns with harnesses to make a shed, inserting the weft through with a shuttle or rapier, and firmly beating it into place with a reed. Modern looms use rapier or projectile picking for higher speeds.
Weaves are formed by interlacing two sets of threads called warp and weft. Woven structures are classified as simple or compound based on the number of thread series. The repeat of a weave indicates the minimum number of warp and weft threads for a given pattern, comprising the warp and weft repeat sizes. Weaves can be represented by design drafts showing the interlacing pattern, peg or lifting plans indicating heald shaft order, and drafting plans depicting thread arrangement. Basic elements include the design, draft, and peg plan. Plain weave and twill weave are common structures.
This presentation summarizes three basic weaves: plain weave, twill weave, and satin/sateen weave. It provides details on the characteristics, modifications, and end uses of each weave type. The presentation was given by three students for their course coordinator and included sections on plain weave and its derivatives like warp rib and weft rib weaves. Twill weave and its various forms like diamond, broken, and elongated twills were also explained. Finally, the presentation covered satin and sateen weaves, their classifications as warp or weft faced, and their applications in various textile products.
Flat knitting is a method for producing knitted fabrics in which the work is turned periodically, i.e., the fabric is worked with alternating sides facing the knitter. A "Flat" or Vee Bed knitting machine consists of 2 flat needle beds arranged in an upside-down "V" formation.
This document discusses various types of fabric structures and weaves. It begins with an introduction to the main methods of fabric production - weaving, knitting, and non-woven. It then focuses on woven fabrics and provides details on the classification, representation, and basic elements of woven designs. The key woven structures discussed include plain weave, twill weave, and satin/sateen weave. For each weave type, the document explains the weave repeat, shift, characteristics, and examples. It also covers various types of draft plans and their uses for different woven structures.
1. Plain or single jersey is the simplest type of weft knitted fabric produced using a single set of needles.
2. It has a V-shape pattern on the technical face and interlocking semi-circles on the technical back.
3. Single jersey fabric is produced using a plain circular latch needle machine, which uses a single set of latch needles to form loops.
There are two main types of feed systems for knitting machines: positive and negative. The positive feed system has additional yarn storage and a more complex machine mechanism than the negative feed system. It also takes more time to operate. The negative feed system does not have additional yarn storage and has a simpler, faster machine mechanism. The knitting machine used in the experiment has a positive feed system, as evidenced by its additional yarn storage component.
This presentation provides an overview of the weaving process. It discusses yarn preparation including warping, sizing, and drawing processes. The primary motions of weaving - shedding, picking, and beating-up - are explained. Common weave structures like plain, twill, and satin are described. Defects in woven fabrics such as broken picks and wrong end color are also highlighted. The presentation concludes with examples of different woven fabric types.
This document describes an experiment on problems and maintenance of a rib circular knitting machine. It introduces the basic elements of the machine: needles, sinkers, and cams. The objectives are to understand how to set up the basic elements, perform maintenance, and understand their functions. It then describes the machine parts and provides step-by-step procedures for replacing broken needles, sinkers, and defective cams. The conclusion states the experiment teaches about problems, maintenance, and specifications of the rib circular knitting machine.
There are three basic elements of knitting: needles, cams, and sinkers. There are three types of needles - latch needles, spring-bearded needles, and compound needles. Cams convert rotary motion into reciprocating motion and come in two types: engineering cams and knitting cams. Sinkers perform three functions: loop formation, holding down loops, and knocking over loops. Sinkers are divided into three groups based on their functions.
Knitting is a method of fabric production using loops of yarn or thread. There are two main types - warp knitting where the yarn runs vertically, and weft knitting where the yarn runs horizontally. Weft knitting is used for finished garments and includes different stitches like plain, purl, rib which can be produced on flatbed or circular machines. Circular machines allow continuous production of tubular fabrics at high speeds. Common knit fabrics include jersey with wales on one side, rib with alternating wales, and interlock with a smooth surface on both sides.
1) Plain single jersey is a basic weft knitted fabric where the front side has face loops forming a "V" shape and the back side has back loops forming semi-circles.
2) It is produced using a plain circular latch needle machine with one set of needles knitting at each feed to form a single loop per course.
3) Single jersey fabric is lightweight, comfortable, and inexpensive to produce, making it widely used for apparel and other applications. Variations can be made by modifying the knitting order.
This document provides terminology and concepts related to knitting. It defines terms like wale, course, course length, gauge, and needle loop. It describes different types of knitting needles including latch needles, spring bearded needles, and compound needles. It explains knitting elements like cams, stitches, and sinkers. Cams control needle movements and include knit, tuck, and miss cams. Stitches include plain knit stitches, tuck stitches, and miss stitches. Sinkers help form loops during knitting.
Primary Motion of weaving in Fabric Manufacturing Technology AtiqFaysal
This presentation discusses the primary motions of weaving, including shedding, picking, and beat-up. It defines primary motions as the fundamental mechanisms that are essential to produce fabric. The presentation covers different types of shedding mechanisms like tappet, dobby, and jacquard shedding. It also discusses types of picking mechanisms like over picking and under picking. The cone over picking mechanism and beat-up mechanism are explained in detail. The presentation aims to provide an overview of the key primary motions and mechanisms involved in the weaving process.
This document discusses three main types of knitting needles: bearded needles, latch needles, and compound needles. Bearded needles are the simplest and cheapest type, made from a single piece of metal with a fixed hook. Latch needles are more complex but self-acting, with a movable latch that opens and closes to form loops. Compound needles have a separate sliding element that works with an open hook to form loops without straining the yarn. The document provides details on the features, parts, advantages, and limitations of each needle type.
stiffness,Handle,Drape properties of fabric ,Fabric property TTQC-2AtiqFaysal
This presentation discusses the stiffness, handle, and drape properties of fabrics. It will cover stiffness and how it is tested using machines like the Shirley Stiffness tester. It will also discuss fabric handle properties, the factors that influence handle, and how to measure drape properties using a drape tester to determine the drape coefficient. Relevant apparatus and testing procedures will be explained.
The document introduces various types of special or fancy yarns. It begins by explaining that fancy yarns are produced through spinning, twisting, wrapping and other processes to create unique textures and optical effects. Some types of fancy yarns mentioned include marl yarn, spiral yarn, knop yarn, slub yarn, fasciated yarn, tape yarn, chainette yarn, and ribbon yarns. Each type is then defined and its uses or production process described. The document aims to provide an overview of different specialty yarns beyond basic spun yarns.
This document discusses different types of picking and picking mechanisms used in weaving. It begins with an introduction to picking, which is the process of passing the weft yarn through the warp shed during weaving. It then describes various picking mechanisms including overpicking, underpicking, and cone overpick and underpick mechanisms. The document provides details on how these different mechanisms work to insert the weft yarn through the shed. It concludes with advantages and disadvantages of different weft insertion methods like projectile, rapier, air jet, and water jet looms.
VDQ pulley (Variable Dia for Quality Pulley): It is a very important part of the machine. It controls the quality of the product. Altering the position of the tension pulley changes the G.S.M. of the fabric.
Various tappet loom parts with functionMd Nurunnabi
The document defines and describes the key parts of a tappet loom. A tappet loom uses tappets, which are levers or projections moved by cams, to produce reciprocating motion that allows the loom to weave fabric. The main components of a tappet loom are the warp beam, heddles, shuttle, reed, tappets, and take-up roller. The tappets are connected to treadles and use cam motion to alternately lift the heddles, creating a shed for the shuttle to pass through and weave in the weft thread.
This document is an 11-page lab report on studying a flat bed knitting machine. It includes diagrams of the machine's yarn path, needle beds arranged in a V formation, and cam carriage system. The report describes the machine parts like the needle beds, yarn carriers, and different cams. It explains the knitting action where the needle butts are lifted and lowered by the cam system to transfer stitches and form new loops. The conclusion states that this experiment provided an introduction to flat bed knitting machine operations and settings that could help with industrial applications.
Presentation on Weft Knitting Machine (Single Jersey, Rib & Interlock)Shawan Roy
This document provides an overview of weft knitting machines, including single jersey, rib, and interlock machines. It defines knitting as a process of creating fabric by interlocking loops of yarn and describes the key components and functions of weft knitting machines. The document classifies weft knitting machines based on their frame design, number of needle beds, product type, and basic structure. It also outlines the features and components of single jersey, rib, and interlock circular knitting machines.
Woven fabric is produced by interlacing warp threads that run lengthwise with weft threads that run across. The appearance and properties of woven fabric depend on yarn structure and fabric structure. There are four basic fabric parameters: thread count, yarn diameter, yarn bending, and weaving order. Weaving involves repeatedly raising warp yarns with harnesses to make a shed, inserting the weft through with a shuttle or rapier, and firmly beating it into place with a reed. Modern looms use rapier or projectile picking for higher speeds.
Weaves are formed by interlacing two sets of threads called warp and weft. Woven structures are classified as simple or compound based on the number of thread series. The repeat of a weave indicates the minimum number of warp and weft threads for a given pattern, comprising the warp and weft repeat sizes. Weaves can be represented by design drafts showing the interlacing pattern, peg or lifting plans indicating heald shaft order, and drafting plans depicting thread arrangement. Basic elements include the design, draft, and peg plan. Plain weave and twill weave are common structures.
This presentation summarizes three basic weaves: plain weave, twill weave, and satin/sateen weave. It provides details on the characteristics, modifications, and end uses of each weave type. The presentation was given by three students for their course coordinator and included sections on plain weave and its derivatives like warp rib and weft rib weaves. Twill weave and its various forms like diamond, broken, and elongated twills were also explained. Finally, the presentation covered satin and sateen weaves, their classifications as warp or weft faced, and their applications in various textile products.
Flat knitting is a method for producing knitted fabrics in which the work is turned periodically, i.e., the fabric is worked with alternating sides facing the knitter. A "Flat" or Vee Bed knitting machine consists of 2 flat needle beds arranged in an upside-down "V" formation.
This document discusses various types of fabric structures and weaves. It begins with an introduction to the main methods of fabric production - weaving, knitting, and non-woven. It then focuses on woven fabrics and provides details on the classification, representation, and basic elements of woven designs. The key woven structures discussed include plain weave, twill weave, and satin/sateen weave. For each weave type, the document explains the weave repeat, shift, characteristics, and examples. It also covers various types of draft plans and their uses for different woven structures.
1. Plain or single jersey is the simplest type of weft knitted fabric produced using a single set of needles.
2. It has a V-shape pattern on the technical face and interlocking semi-circles on the technical back.
3. Single jersey fabric is produced using a plain circular latch needle machine, which uses a single set of latch needles to form loops.
There are two main types of feed systems for knitting machines: positive and negative. The positive feed system has additional yarn storage and a more complex machine mechanism than the negative feed system. It also takes more time to operate. The negative feed system does not have additional yarn storage and has a simpler, faster machine mechanism. The knitting machine used in the experiment has a positive feed system, as evidenced by its additional yarn storage component.
This presentation provides an overview of the weaving process. It discusses yarn preparation including warping, sizing, and drawing processes. The primary motions of weaving - shedding, picking, and beating-up - are explained. Common weave structures like plain, twill, and satin are described. Defects in woven fabrics such as broken picks and wrong end color are also highlighted. The presentation concludes with examples of different woven fabric types.
This document describes an experiment on problems and maintenance of a rib circular knitting machine. It introduces the basic elements of the machine: needles, sinkers, and cams. The objectives are to understand how to set up the basic elements, perform maintenance, and understand their functions. It then describes the machine parts and provides step-by-step procedures for replacing broken needles, sinkers, and defective cams. The conclusion states the experiment teaches about problems, maintenance, and specifications of the rib circular knitting machine.
There are three basic elements of knitting: needles, cams, and sinkers. There are three types of needles - latch needles, spring-bearded needles, and compound needles. Cams convert rotary motion into reciprocating motion and come in two types: engineering cams and knitting cams. Sinkers perform three functions: loop formation, holding down loops, and knocking over loops. Sinkers are divided into three groups based on their functions.
Knitting is a method of fabric production using loops of yarn or thread. There are two main types - warp knitting where the yarn runs vertically, and weft knitting where the yarn runs horizontally. Weft knitting is used for finished garments and includes different stitches like plain, purl, rib which can be produced on flatbed or circular machines. Circular machines allow continuous production of tubular fabrics at high speeds. Common knit fabrics include jersey with wales on one side, rib with alternating wales, and interlock with a smooth surface on both sides.
1) Plain single jersey is a basic weft knitted fabric where the front side has face loops forming a "V" shape and the back side has back loops forming semi-circles.
2) It is produced using a plain circular latch needle machine with one set of needles knitting at each feed to form a single loop per course.
3) Single jersey fabric is lightweight, comfortable, and inexpensive to produce, making it widely used for apparel and other applications. Variations can be made by modifying the knitting order.
This document provides terminology and concepts related to knitting. It defines terms like wale, course, course length, gauge, and needle loop. It describes different types of knitting needles including latch needles, spring bearded needles, and compound needles. It explains knitting elements like cams, stitches, and sinkers. Cams control needle movements and include knit, tuck, and miss cams. Stitches include plain knit stitches, tuck stitches, and miss stitches. Sinkers help form loops during knitting.
Primary Motion of weaving in Fabric Manufacturing Technology AtiqFaysal
This presentation discusses the primary motions of weaving, including shedding, picking, and beat-up. It defines primary motions as the fundamental mechanisms that are essential to produce fabric. The presentation covers different types of shedding mechanisms like tappet, dobby, and jacquard shedding. It also discusses types of picking mechanisms like over picking and under picking. The cone over picking mechanism and beat-up mechanism are explained in detail. The presentation aims to provide an overview of the key primary motions and mechanisms involved in the weaving process.
The slide is about Knitting, Jacquard Knitting, Objective of Jacquard Knitting, Classification of Jacquard Knitting. The slide contains Semi Automatic Jacquard Knitting components, formation of Knit, Tuck and Miss loop, Electrical Jacquard Knitting Machine Principle, Components, Electronic needle selection. Formation of loops, Multi-step Geometric Needle Selection and Pattern Wheels
The document summarizes the features and working of a rib circular knitting machine. It describes how rib fabrics have alternating wales of face and back loops which makes the fabric thicker and less prone to curling. It then explains the working of a rib circular knitting machine, including the path of the yarn from creel to needles to fabric winding roller. The key parts of the machine like dial, cylinder, needles and their functions are outlined. Finally, the 8 step knitting action is illustrated with diagrams showing the movement of needles from tuck to cast on position to form loops and stitches.
Needle loop refers to the upper part of the knitted loop formed by the needle drawing yarn. There are three main types of needles used. Sinker loop refers to the lower part that connects two adjacent needle loops in the same course.
Sinker is a thin metal plate that assists with loop formation, holding loops down, and pushing fabric forward between needle movements. It plays an important role in restricting loop movement and supporting the fabric.
Needle loop and sinker loop are the two vital components that make up each stitch in knitting and understanding the difference between them is important for knitting technology.
The document lists and describes 17 key parts of a sewing machine:
1) The spool pin holds the thread spool. 2) The thread guide positions the thread from spool to needle. 3) The tension discs adjust thread tension via a spring and nut. 4) The take up lever feeds and tightens the thread loop. 5) The needle bar holds and moves the needle. 6) The bobbin case catches the top thread to form stitches. 7) The presser foot holds the cloth firmly.
The weaving process consists of five basic operations, shedding, picking, beating-up, left off and take up. Shedding: Separating the warp yarns into two layers by lifting and lowering the shafts, to form a tunnel known as the 'shed'. ... Beating-up: Pushing the newly inserted weft yarn back into the fell using the reed.
This document summarizes the different parts of a circular knitting machine. It begins by explaining that knitting is a process that turns yarn into fabric by forming consecutive loops or stitches. It then describes the major components of a circular knitting machine, including the creel for holding cones of yarn, tension devices like the VDQ pulley for controlling stitch length, needles and sinkers for forming loops, cams for guiding needle movement, and various guides, rollers, and detectors to feed yarn and collect finished fabric. It concludes by thanking the reader.
Picking Mechanism | Beat Up Mechanism | Over Picking Under Picking MechanismMd Rakibul Hassan
The document discusses weaving technology and describes different mechanisms involved. It focuses on picking and beat-up mechanisms. Picking inserts the weft thread through the warp shed and can be bidirectional or unidirectional. Beat-up drives the inserted weft to the fell of the cloth. There are different types of picking (over, under) and beat-up (single, double, cam) mechanisms that are suited to different fabric weights and loom styles. Faults like early/late picking and factors influencing beat-up force are also covered.
1. The document discusses three main types of knitting needles: bearded, latch, and compound needles.
2. Bearded needles have a curved hook and beard, while latch needles contain a hook and separate latch. Compound needles consist of an open hook and sliding closing element.
3. Each needle type has advantages and limitations for different knitting applications. Bearded needles are simplest but have low productivity. Latch needles are self-acting and suitable for computer control. Compound needles reduce yarn strain but are most expensive.
This lab report summarizes 3 experiments on the mechanisms of a conventional loom:
1) Studying the gearing diagram and calculating shaft speeds and gear teeth numbers.
2) Studying positive and negative tappet shedding mechanisms and their parts.
3) Studying overpicking and underpicking mechanisms, identifying their parts, and explaining how each works.
The report provides details on the objectives, parts, principles, and uses of each mechanism studied. The commentary reflects on learning about important loom components and how the experience could apply to future work.
23MT02 - Concepts of Shedding,Picking and Beatup.pptxNArun20
The document discusses key concepts in weaving including shedding, picking, and beat-up. Shedding involves separating the warp threads to create an opening called a shed for inserting the weft. Common shedding methods use heddles, shafts, and mechanisms like dobby, tappet, and jacquard. Picking is the process of inserting the weft through the shed using mechanisms like shuttle, rapier, projectile, air jet, or water jet. Beat-up compresses the newly inserted weft against the fabric using a reed or beater to ensure an even, uniform fabric structure.
The document discusses the elements used to measure stitch quality, including stitch size, tension, sequence, elasticity, and distortion. It then describes the 5 key steps in the principle of lock stitch formation: 1) The needle enters the fabric and a needle loop is formed. 2) The rotating bobbin hook catches the needle loop and moves it over the bobbin case, interlacing the threads. 3) The needle pulls the bobbin thread up through the fabric. 4) The loop closes to form the stitch. 5) The needle descends to form a new loop and pull it up to complete the next stitch. Proper tension of the needle and bobbin threads is important for correct stitch appearance.
This document describes the cam arrangement of a single jersey knitting machine. It discusses the main parts of the machine including the latch needles, sinkers, needle cylinder and various cams. It explains the knitting action of the latch needles and how the needle and sinker cams control different stages of the knitting cycle. The document also discusses needle and sinker timing and how adjusting these can affect fabric properties like weight and tightness. Finally, it provides an example of the cam system used in an interlock knitting machine.
A Comprehensive Study on Rib circular Knitting MachineShoaib Al Mukit
Presentation Name : Comprehension Study on Rib circular Knitting Machine
Submitted by : Abdullah Al Mukit Shoaib, student of northern university Bangladesh
Submitted to : Farhana Afroz, Lecturer at Northern University Bangladesh
This document provides an overview of flat bed weft knitting machines. It describes the key components of single and double bed machines, including the needle, cam carriage, and methods of knit, tuck, and float stitch formation. It also summarizes computerized flat bed knitting machines, explaining their control system, input/output components, and programming capabilities.
The document summarizes the compound needle warp knitting machine. It introduces the machine, which was developed in 1946 and features tubular compound needles and two guide bars. It can produce 1000 courses per minute, twice as fast as bearded needle machines. The document then describes the three step loop formation process involving needle rise and guide bar swing, the overlap and return swing, and landing and knock-over. Finally, it distinguishes tricot and raschel fabrics that can be produced on the machine, with tricot using fine yarns for simple designs and raschel using heavy yarns for intricate patterns.
The document provides information about circular knitting machines. It defines knitting as transforming yarn into interlocking loops. Circular knitting creates seamless tubes using circular needles or machines. Machine parts include the frame, power supply, yarn feeding system, and quality control components. Circular knitting machines are used to produce fabrics for various garments and other materials. Modern machines feature computer controls to monitor functions like speed and stops.
Knitting 2 sum For Fabric Very ImportantSadia Textile
Types of warp knitting m/c:
Two major classes of warp knitting m/cs:-
1. Tricot warp knitting m/c
2. Raschel warp knitting m/c.
Features Tricot warp knitting m/c:
In the past, tricot m/cs mainly employed bearded needles with a pressure bar
Tricot m/cs have a gauge expressed in needle per inch and chain link numbering 0, 1, 2, 3, 4 etc. generally with three links per course
Their sinkers, which are joined to each other at the front and back, never move clear of the needles as they combine the functions of holding down, knocking over and supporting the fabric
The fabric is drawn-away towards the batching roller almost at right angles to the needles bar
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1. Principles of knitting Technology
Basic elements of knitting:
There are three basic elements of knitting
Needle
Cam and
Sinker
The Needle:
The main element for intermeshing of loops is ‘the needle’. There are three types of
needles namely:
Spring bearded needle
Latch needle and
Compound needle.
2. Spring bearded needle:
The spring bearded needle made of steel wire consist of the
following parts:
The Stem: The stem around which the needle loop is
formed.
The Head: Where the stem is turned into a hook to draw
the new loop through the old loop.
The Beard: Which is the curved downwards continuation
of the hook that is used to separate the trapped new
loop inside from the old loop as it slides off the needle
beard.
The Eye or groove: Cut in the stem to receive the
pointed tip of the beard when it is pressed, thus
enclosing the new loop.
The Shank or Butt: The butt serving to attach the needle
in the needle bar.
3. Latch needle:
The latch needle contain the following parts:
The Hook: The hook which draws and returns the new loop.
The Latch: Freely rotating around the axle.
The Latch blade- This latch blade locates the latch
in the needle.
The Latch spoon- The latch spoon is an extension of
blade and bridges the gap between the hook and
stem.
The stem: The stem of latch needle carries the loop in the
clearing or rest position.
The Butt: Butt of latch needle enables the needle to be
reciprocated.
The Tail: The tail is an extension below the butt giving
additional support to the needle and keeping the needle in its
trick.
4. The Compound Needle:
The compound needle consists of two separate parts
Stem
Sliding latch
5. The Cam:
Cam is the second primary knitting element. The cams are the mechanical
devices which convert the rotary machine drive into a suitable reciprocating
action for the needles.
The cams are of two types
Engineering cam and
Knitting cam
Knitting cam: The knitting cams are divided in to three groups, such as
a) Knit cam
b) Tuck cam
c) Miss cam
6. Fig: Knit,Tuck & Miss Cam
At each yarn feed position there is a set of cams (mainly knit cam) consisting of at least a raising
or clearing cam, a stitch or lowering cam, guard cam and an up throw cam whose combined
effect is to cause a needle to carry out a knitting cycle if required.
7.
8. The Raising Cam/Clearing Cam:
The upward movement of the needle is obtained by that cam. The rising cam places the
needle at a certain level as it approaches the yarn area.
The Stitch Cam:
Cams controlling the downward movement of the needles are called stitch cam. The stitch
cam draws the needle down below the knitting level, thereby drawing a new loop through the
old loop.
The Guard Cam:
Guard cam keep the needle butts in their race-way.
The Up throw Cam:
The up throw cam takes the needles back to the rest position and allows the formed loops to
relax.
9. The sinker:
The sinker is the third primary knitting element. It is a thin metal plate with an
individual or a collective action operating approximately at right angles from the hook
side of the needle bed, between adjacent needles.
Functions:
It may perform one or more of the following functions, dependent upon the
machine’s knitting action and consequent sinker shape and movement:
Loop formation
Holding-down
Knocking-over
13. Run–in: In the running position, the held old loop rests on the top of the
open latch.
Clearing: Clearing occurs as the held loop slips of the latch and on the
stem as the needle moves upwards.
Yarn feeding: A downwards movement enables the needle hook to engage
a new piece of yarn. This is known as feeding.
Knock-over: As the needles continue downwards the latch is forced to
close under the influence of the held loop. Knock over occurs as the held
loop disengages from the needle.
Loop pulling: Following knock over, the loop pulling occurs and a new knit
loop is formed. The needle must return now to the running position to
complete the cycle.
Control of the held loop is usually achieved by the use of sinkers.
15. 1. The needle is in the (so-called) rest position, with the previously formed
loop (a) held on its stem and covered by the hook.
2. The loop is cleared from the needle hook to a lower position on the
needle stem.
3. The new yarn (b) is fed to the needle hook at a higher position on the
needle stem than the position of the previous (old) loop.
4. The yarn is formed into a ‘new’ loop.
5. The hook is closed by a auxiliary element known as presser, enclosing the
new loop and excluding and landing the old loop onto the outside of the
closed hook.
6. The new loop (b) is drawn through the head of the old loop (a).
Simultaneously the old loop slides off the closed hook of the needle and is
cast-off or knocked-over.
7. The old loop now hangs from the feet of the fully formed new loop and
the knitting cycle starts again.
17. 1. The held loop is positioned in the throat of the sinker when the sinker
moves forward and the needle moves upward for clearing. The held loop is
held by the throat and hence its movement along the needle is restricted.
2. The sinker remains at its forward position when the needle attains its
clearing position.
3. The sinker retracts when the needle comes down after feeding. At this
stage, due to sinkers retraction, fabric or held loop is eased out. Also the
sinker belly supported the fabric or held loop and hence its movements
along the needle is prevented.
4. Sinker remains in backward position and the needle descends to its lowest
position drawing the new loop through the old one.
5. Before the needle ascends, the sinker moves forward to push the knitted
fabric a little and to hold the old loop away from the head of the needle
and to be in a position to control the fabric.
18. Methods of Yarn Feeding:
There are two methods of yarn feeding:
Moving the yarn past the needles
Moving the needles past a stationary yarn feed position
When the yarn moves past the needles, the fabric will be stationary because
the loops hang from the needles. This arrangement exists on all warp
knitting machines.