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.
Pile fabrics: Manufacturing methods include woven pile fabric formation & others methods such as knit pile fabric, tufted pile fabrics etc. A "Terry" or a "Terry Towel" as is generally known is a woven pile fabric formed by slack tension weave process. of weaving.
Jacquard shedding system was developed by William Jacquard. In case of cam and dobby shedding systems, large number of yarns passing through a heald is controlled.Thus it precludes the possibility of controlling individual ends independently. Therefore, complicated woven designs cannot be made using cam or dobby shedding systems. With the jacquard shedding system individual ends can be controlled independently and thus large woven figures can be produced in fabrics.
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.
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.
The document discusses various aspects of automatic loom mechanisms, including:
1. It describes different types of weft replenishment mechanisms like mechanical, electrical, and photoelectric feelers and how they work to automatically detect when the weft yarn is running low and trigger a change.
2. It explains different weft patterning motions like weft mixing, drop box, and circular box motions that allow inserting different weft yarns to create patterns.
3. It provides details on how circular box and weft mixing motions work through lever mechanisms to rotate the boxes and change the inserted weft yarn every other pick.
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.
Different parts of knitting machine and parameterAzmir Latif Beg
Knitting machines are mainly two types; they are circular knitting machine and flat bed knitting machine. This two types are hugely use in knitting machine. A knitting machine is composed of lots of parts. Every parts of a machine are important for run the machine smoothly. Every part has a specific function during operation.
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.
Pile fabrics: Manufacturing methods include woven pile fabric formation & others methods such as knit pile fabric, tufted pile fabrics etc. A "Terry" or a "Terry Towel" as is generally known is a woven pile fabric formed by slack tension weave process. of weaving.
Jacquard shedding system was developed by William Jacquard. In case of cam and dobby shedding systems, large number of yarns passing through a heald is controlled.Thus it precludes the possibility of controlling individual ends independently. Therefore, complicated woven designs cannot be made using cam or dobby shedding systems. With the jacquard shedding system individual ends can be controlled independently and thus large woven figures can be produced in fabrics.
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.
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.
The document discusses various aspects of automatic loom mechanisms, including:
1. It describes different types of weft replenishment mechanisms like mechanical, electrical, and photoelectric feelers and how they work to automatically detect when the weft yarn is running low and trigger a change.
2. It explains different weft patterning motions like weft mixing, drop box, and circular box motions that allow inserting different weft yarns to create patterns.
3. It provides details on how circular box and weft mixing motions work through lever mechanisms to rotate the boxes and change the inserted weft yarn every other pick.
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.
Different parts of knitting machine and parameterAzmir Latif Beg
Knitting machines are mainly two types; they are circular knitting machine and flat bed knitting machine. This two types are hugely use in knitting machine. A knitting machine is composed of lots of parts. Every parts of a machine are important for run the machine smoothly. Every part has a specific function during operation.
This document discusses lining and interlining, which are commonly used elements in garment manufacturing but can be confusing. Lining is used to cover the inner surface of garments, while interlining is placed between two fabric layers. The document defines each term and discusses the various types of materials used for lining and interlining like cotton, silk, nylon, polyester, and their advantages like comfort and shape retention. Fusible interlining is attached using heat and pressure for quick production, while sewn interlining involves sewing but is simpler. In conclusion, lining and interlining are important for making high quality garments.
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.
The document analyzes the basic structures of weft knitting fabrics. It describes four primary structures: single jersey/plain knit, rib, interlock, and purl. Each structure is defined by its appearance, extensibility, edge curling properties, ability to unravel, and common end uses. The single jersey/plain knit structure forms the simplest balanced fabric. Rib structures require two needle beds and form fabrics with faces of loops on both sides. Interlock fabrics are locked on both sides but can be stretched. Purl structures involve special needles and form fabrics with horizontal rib effects.
This document discusses Abdullah Al Mahfuj's presentation on weft knitting machines. It begins with an introduction to knitting versus weaving. It then classifies weft knitting machines based on frame design and needle bed arrangement. Specifically, it discusses circular and flat knitting machines. Within circular machines, it distinguishes between single and double jersey machines. The presentation highlights features of single jersey, rib, and interlock circular knitting machines. It concludes by describing the main parts of a knitting machine such as needles, cams, sinkers, dials, pulleys, belts, motors, and sensors and their functions.
Rapier weaving is a shuttleless weaving technique where rigid or flexible rapiers carry the weft yarn through the shed. There are single and double rapier systems, with double being more common. In double systems, one rapier (giver) brings the yarn to the center and transfers it to the other rapier (taker) to carry to the other side. Dewas and Gabler systems differ in how the transfer occurs. Rapier machines are versatile and efficient with minimal stress on the weft yarn, resulting in high quality fabrics and low yarn breakage. Factors like machine speed, yarn properties, and shed formation affect yarn stresses.
This document discusses the use of electronics in knitting machines. It provides advantages of electronic control over mechanical control, such as higher speeds, easier programming, and greater versatility. It describes various applications of electronics like stop motions, yarn feeding systems, needle selection, and pattern selection. Microprocessors and computers allow storing large amounts of knitting data and programs. Computerized knitting machines can be programmed to move the carriage and select needles electronically for complex patterns. Overall, electronics have significantly improved knitting machine capabilities and productivity.
This document presents information about ring spinning. Md. Yousuf Hossain from Green University of Bangladesh introduces the topic and defines key terms like fiber, spinning and yarn. It then describes the ring spinning process which involves blow room, carding, draw frame and speed frame before the roving reaches the ring frame. Here, it is drafted and twisted to produce yarn, which is then wound onto bobbins. The document focuses on the drafting zone of the ring frame and explains how higher drafts are applied. It also provides details about how the yarn travels through the traveller and onto the cop during winding. In closing, advantages and limitations of ring spinning are mentioned.
Flat knitting machines produce flat knitted fabrics using stationary needles and a moving cam system. There are two main types - V-bed machines with diagonally arranged needles and flat-bed machines with parallel needles. The machine components include the needle bed, cam boxes, and various cams to control needle movement and create different stitch types. Operators can selectively introduce knit, tuck, and miss stitches using different cam positions and high/low butt needles. The machine can produce two separate fabrics or a tubular fabric simultaneously through specialized cam and needle bed arrangements.
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.
This presentation discusses knitting machine elements like needles, sinkers, cams, and lubrication systems. It describes different types of needles from manufacturers like Groz-Beckert, their specifications and benefits. Sinkers are thin metal plates that perform functions like loop formation and holding down. Cams are profiled to produce needle movements and include knit, tuck, and miss cams. Pulsonic and Uniwave are lubrication systems that precisely distribute oil to reduce consumption and mist. The effects of these elements on fabric properties are also examined.
This document discusses different types of weft knitting techniques. It describes the basic process of weft knitting where loops are formed across the width of fabric using a single thread. The main types discussed are plain/single jersey, purl, rib, and interlock fabrics. For each type, it provides details on how they are knitted, their properties and characteristics.
The comber is a machine that prepares cotton fibers for spinning into yarn by removing short fibers and impurities. It improves the quality characteristics of yarns such as evenness, strength, and cleanliness. To achieve these quality improvements, the comber must eliminate short fibers, remaining impurities, and neps from the fiber material while forming an optimal sliver. Modern comber preparation systems use a draw frame followed by a sliver doubling machine like a UniLap to prepare uniform batts for feeding into rectilinear combers, which have stationary detaching rollers and swinging nippers to further clean and parallelize the fibers.
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.
Generic specifications of an overlock machineShubham Singh
The document provides generic specifications for an overlock machine. It describes the key features including performing an overlock stitch, sewing knitted and woven fabrics, and cutting fabric edges. It also outlines the types of stitches, needles, threads, feed dogs, and other components involved. The conclusion summarizes the general specifications for an overlock machine including its intended applications, maximum sewing speed, and other technical details.
INTRODUCTION
The ring spinning will continue to be the most widely used form of spinning machine in the near future, because it exhibits significant advantages in comparison with the new spinning processes.
Following are the advantages of ring spinning frame
• It is universally applicable, i.e. any material can be spun to any required count
• It delivers a material with optimum characteristics, especially with regard to structure and strength.
• It is simple and easy to master
• The know-how is well established and accessible for everyone
Feature and properties of two guide bar warp knit designs Md Fahimuzzaman
Feature and properties of two guide bar warp knit designs
Features of two guide bar warp knit design:
Good Dimensional stability, reasonable cover
Better loop shape and ladder resistance
Reasonable weight
Better pattern scope
Seam slippage is when a sewn seam opens under load and some of the opening remains even after the load is removed. It can be caused by loosely woven fabric, not using enough stitches per inch, poor stitch balance, or having too narrow of a seam margin. When two pieces of fabric are pulled at right angles to the seam, it can reveal a gap between the pieces called a seam grin, showing the thread in the gap. Proper testing can identify issues with seam slippage.
Stitch bonding is a hybrid textile manufacturing technique that combines elements of nonwoven, sewing, and knitting processes. It involves locking layers of cross-laid fibers or nonwoven fabrics into a warp knit structure using pointed needles that penetrate the layers and insert stitching yarn. There are several stitch bonding systems that differ in whether they use a separate stitching thread or form loops within the layers themselves. Common applications of stitch bonded fabrics include upholstery, mattress coverings, cleaning cloths, and industrial materials like filters or insulation.
The document discusses textile finishing processes. It begins by introducing textiles and their basic components and materials. It then describes the major departments of textiles - spinning, weaving, and wet-processing. Wet-processing involves pretreatments like scouring and bleaching, dyeing and printing, and finishing treatments like calendaring to impart properties like softness and durability. Specific mechanical finishing processes are also outlined, including sueding, raising, shearing, and decating. Calendaring is discussed in detail as a process that smoothes fabrics and modifies properties.
This presentation discusses various methods of wrap spinning yarns. It describes the selfil, repco, hollow spindle, ring frame, differential twist, wrap rotor, woolen card, and parafil systems. The hollow spindle method is identified as the most important technique, involving drafting fibers through a hollow spindle while wrapping with a filament to produce wrap yarns in a single continuous process without true twisting. Other methods like the selfil and repco systems use self-twisting to wrap core fibers with filaments.
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 lining and interlining, which are commonly used elements in garment manufacturing but can be confusing. Lining is used to cover the inner surface of garments, while interlining is placed between two fabric layers. The document defines each term and discusses the various types of materials used for lining and interlining like cotton, silk, nylon, polyester, and their advantages like comfort and shape retention. Fusible interlining is attached using heat and pressure for quick production, while sewn interlining involves sewing but is simpler. In conclusion, lining and interlining are important for making high quality garments.
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.
The document analyzes the basic structures of weft knitting fabrics. It describes four primary structures: single jersey/plain knit, rib, interlock, and purl. Each structure is defined by its appearance, extensibility, edge curling properties, ability to unravel, and common end uses. The single jersey/plain knit structure forms the simplest balanced fabric. Rib structures require two needle beds and form fabrics with faces of loops on both sides. Interlock fabrics are locked on both sides but can be stretched. Purl structures involve special needles and form fabrics with horizontal rib effects.
This document discusses Abdullah Al Mahfuj's presentation on weft knitting machines. It begins with an introduction to knitting versus weaving. It then classifies weft knitting machines based on frame design and needle bed arrangement. Specifically, it discusses circular and flat knitting machines. Within circular machines, it distinguishes between single and double jersey machines. The presentation highlights features of single jersey, rib, and interlock circular knitting machines. It concludes by describing the main parts of a knitting machine such as needles, cams, sinkers, dials, pulleys, belts, motors, and sensors and their functions.
Rapier weaving is a shuttleless weaving technique where rigid or flexible rapiers carry the weft yarn through the shed. There are single and double rapier systems, with double being more common. In double systems, one rapier (giver) brings the yarn to the center and transfers it to the other rapier (taker) to carry to the other side. Dewas and Gabler systems differ in how the transfer occurs. Rapier machines are versatile and efficient with minimal stress on the weft yarn, resulting in high quality fabrics and low yarn breakage. Factors like machine speed, yarn properties, and shed formation affect yarn stresses.
This document discusses the use of electronics in knitting machines. It provides advantages of electronic control over mechanical control, such as higher speeds, easier programming, and greater versatility. It describes various applications of electronics like stop motions, yarn feeding systems, needle selection, and pattern selection. Microprocessors and computers allow storing large amounts of knitting data and programs. Computerized knitting machines can be programmed to move the carriage and select needles electronically for complex patterns. Overall, electronics have significantly improved knitting machine capabilities and productivity.
This document presents information about ring spinning. Md. Yousuf Hossain from Green University of Bangladesh introduces the topic and defines key terms like fiber, spinning and yarn. It then describes the ring spinning process which involves blow room, carding, draw frame and speed frame before the roving reaches the ring frame. Here, it is drafted and twisted to produce yarn, which is then wound onto bobbins. The document focuses on the drafting zone of the ring frame and explains how higher drafts are applied. It also provides details about how the yarn travels through the traveller and onto the cop during winding. In closing, advantages and limitations of ring spinning are mentioned.
Flat knitting machines produce flat knitted fabrics using stationary needles and a moving cam system. There are two main types - V-bed machines with diagonally arranged needles and flat-bed machines with parallel needles. The machine components include the needle bed, cam boxes, and various cams to control needle movement and create different stitch types. Operators can selectively introduce knit, tuck, and miss stitches using different cam positions and high/low butt needles. The machine can produce two separate fabrics or a tubular fabric simultaneously through specialized cam and needle bed arrangements.
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.
This presentation discusses knitting machine elements like needles, sinkers, cams, and lubrication systems. It describes different types of needles from manufacturers like Groz-Beckert, their specifications and benefits. Sinkers are thin metal plates that perform functions like loop formation and holding down. Cams are profiled to produce needle movements and include knit, tuck, and miss cams. Pulsonic and Uniwave are lubrication systems that precisely distribute oil to reduce consumption and mist. The effects of these elements on fabric properties are also examined.
This document discusses different types of weft knitting techniques. It describes the basic process of weft knitting where loops are formed across the width of fabric using a single thread. The main types discussed are plain/single jersey, purl, rib, and interlock fabrics. For each type, it provides details on how they are knitted, their properties and characteristics.
The comber is a machine that prepares cotton fibers for spinning into yarn by removing short fibers and impurities. It improves the quality characteristics of yarns such as evenness, strength, and cleanliness. To achieve these quality improvements, the comber must eliminate short fibers, remaining impurities, and neps from the fiber material while forming an optimal sliver. Modern comber preparation systems use a draw frame followed by a sliver doubling machine like a UniLap to prepare uniform batts for feeding into rectilinear combers, which have stationary detaching rollers and swinging nippers to further clean and parallelize the fibers.
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.
Generic specifications of an overlock machineShubham Singh
The document provides generic specifications for an overlock machine. It describes the key features including performing an overlock stitch, sewing knitted and woven fabrics, and cutting fabric edges. It also outlines the types of stitches, needles, threads, feed dogs, and other components involved. The conclusion summarizes the general specifications for an overlock machine including its intended applications, maximum sewing speed, and other technical details.
INTRODUCTION
The ring spinning will continue to be the most widely used form of spinning machine in the near future, because it exhibits significant advantages in comparison with the new spinning processes.
Following are the advantages of ring spinning frame
• It is universally applicable, i.e. any material can be spun to any required count
• It delivers a material with optimum characteristics, especially with regard to structure and strength.
• It is simple and easy to master
• The know-how is well established and accessible for everyone
Feature and properties of two guide bar warp knit designs Md Fahimuzzaman
Feature and properties of two guide bar warp knit designs
Features of two guide bar warp knit design:
Good Dimensional stability, reasonable cover
Better loop shape and ladder resistance
Reasonable weight
Better pattern scope
Seam slippage is when a sewn seam opens under load and some of the opening remains even after the load is removed. It can be caused by loosely woven fabric, not using enough stitches per inch, poor stitch balance, or having too narrow of a seam margin. When two pieces of fabric are pulled at right angles to the seam, it can reveal a gap between the pieces called a seam grin, showing the thread in the gap. Proper testing can identify issues with seam slippage.
Stitch bonding is a hybrid textile manufacturing technique that combines elements of nonwoven, sewing, and knitting processes. It involves locking layers of cross-laid fibers or nonwoven fabrics into a warp knit structure using pointed needles that penetrate the layers and insert stitching yarn. There are several stitch bonding systems that differ in whether they use a separate stitching thread or form loops within the layers themselves. Common applications of stitch bonded fabrics include upholstery, mattress coverings, cleaning cloths, and industrial materials like filters or insulation.
The document discusses textile finishing processes. It begins by introducing textiles and their basic components and materials. It then describes the major departments of textiles - spinning, weaving, and wet-processing. Wet-processing involves pretreatments like scouring and bleaching, dyeing and printing, and finishing treatments like calendaring to impart properties like softness and durability. Specific mechanical finishing processes are also outlined, including sueding, raising, shearing, and decating. Calendaring is discussed in detail as a process that smoothes fabrics and modifies properties.
This presentation discusses various methods of wrap spinning yarns. It describes the selfil, repco, hollow spindle, ring frame, differential twist, wrap rotor, woolen card, and parafil systems. The hollow spindle method is identified as the most important technique, involving drafting fibers through a hollow spindle while wrapping with a filament to produce wrap yarns in a single continuous process without true twisting. Other methods like the selfil and repco systems use self-twisting to wrap core fibers with filaments.
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.
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.
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.
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.
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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Principles of knitting Technology.pptx
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.