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Questions and Answers
What is the primary function of a knitting machine?
What is the primary function of a knitting machine?
Which of the following is NOT a type of knitting machine mentioned?
Which of the following is NOT a type of knitting machine mentioned?
What characterizes circular knitting machines?
What characterizes circular knitting machines?
How do pattern stitches get selected in modern knitting machines?
How do pattern stitches get selected in modern knitting machines?
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Which type of machine is primarily used for high-speed fabric knitting?
Which type of machine is primarily used for high-speed fabric knitting?
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What is the function of the timing or counting device in garment-length machines?
What is the function of the timing or counting device in garment-length machines?
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What are the two main categories of weft knitting machines based on end product?
What are the two main categories of weft knitting machines based on end product?
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What is a distinguishing feature of garment-length machines?
What is a distinguishing feature of garment-length machines?
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What is the primary purpose of the lifting action of the needles during the traverse?
What is the primary purpose of the lifting action of the needles during the traverse?
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At what point are the needle butts lifted to 'tucking in the hook' height?
At what point are the needle butts lifted to 'tucking in the hook' height?
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How is the yarn fed during the knitting process?
How is the yarn fed during the knitting process?
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What adjustment is made to produce synchronized knocking-over of both needle beds?
What adjustment is made to produce synchronized knocking-over of both needle beds?
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What is the effect of delayed timing in the knocking-over process?
What is the effect of delayed timing in the knocking-over process?
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Why is delayed timing of the knock-over primarily used in finer gauges?
Why is delayed timing of the knock-over primarily used in finer gauges?
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What prevents the needles from impacting unnecessary strain on the old loops before knitting commences?
What prevents the needles from impacting unnecessary strain on the old loops before knitting commences?
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What characterizes large-diameter circular knitting machines?
What characterizes large-diameter circular knitting machines?
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Which aspect of the mechanism is involved in clearing the needles to full height?
Which aspect of the mechanism is involved in clearing the needles to full height?
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Which type of circular knitting machine is suitable for producing rib knit and similar stitches?
Which type of circular knitting machine is suitable for producing rib knit and similar stitches?
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What is the primary function of the top and bottom stop motions in a circular knitting machine?
What is the primary function of the top and bottom stop motions in a circular knitting machine?
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Which components of a circular knitting machine can stop the machine due to faults like yarn slubs?
Which components of a circular knitting machine can stop the machine due to faults like yarn slubs?
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How does the tape positive feed in a circular knitting machine function?
How does the tape positive feed in a circular knitting machine function?
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What role does the automatic lubrication system play in a circular knitting machine?
What role does the automatic lubrication system play in a circular knitting machine?
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What is the purpose of the start, stop, and inching buttons on a circular knitting machine?
What is the purpose of the start, stop, and inching buttons on a circular knitting machine?
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Which statement about single-bed knitting machines is correct?
Which statement about single-bed knitting machines is correct?
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What is a key characteristic of V-bed knitting machines?
What is a key characteristic of V-bed knitting machines?
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What component is responsible for raising and lowering the needles on a V-bed knitting machine?
What component is responsible for raising and lowering the needles on a V-bed knitting machine?
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Which gauge range is typical for a V-bed knitting machine?
Which gauge range is typical for a V-bed knitting machine?
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What is one of the benefits of using a V-bed knitting machine in production environments?
What is one of the benefits of using a V-bed knitting machine in production environments?
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What kind of needles are typically used in V-bed knitting machines?
What kind of needles are typically used in V-bed knitting machines?
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What does the yarn guide do in a V-bed knitting machine?
What does the yarn guide do in a V-bed knitting machine?
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What range of yarn weights is associated with the yarn packages used in V-bed knitting machines?
What range of yarn weights is associated with the yarn packages used in V-bed knitting machines?
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Which component of the V-bed knitting machine is responsible for linking the two cam systems?
Which component of the V-bed knitting machine is responsible for linking the two cam systems?
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What happens during the drop-off process in knitting?
What happens during the drop-off process in knitting?
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At what position does the needle bar reach its lowest point during the knitting process?
At what position does the needle bar reach its lowest point during the knitting process?
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What is unique about the bed arrangement of a V-bed knitting machine?
What is unique about the bed arrangement of a V-bed knitting machine?
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Which of the following describes rib gaiting in V-bed machines?
Which of the following describes rib gaiting in V-bed machines?
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What is the primary function of the carriage or CAM box in a knitting machine?
What is the primary function of the carriage or CAM box in a knitting machine?
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Which type of machine uses a V-bed configuration?
Which type of machine uses a V-bed configuration?
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What is a key feature of flatbed purl machines?
What is a key feature of flatbed purl machines?
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How does the fabric move away from the V-bed knitting machine?
How does the fabric move away from the V-bed knitting machine?
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What is the function of the lint blower in the fabric production process?
What is the function of the lint blower in the fabric production process?
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Which device is responsible for providing a positive feed of yarn to the knitting needles?
Which device is responsible for providing a positive feed of yarn to the knitting needles?
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What role does the driven pulley play in the operation of the MPF?
What role does the driven pulley play in the operation of the MPF?
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What is the purpose of the stopper in the MPF system?
What is the purpose of the stopper in the MPF system?
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Which component is used to hold the yarn cone in a vertical position?
Which component is used to hold the yarn cone in a vertical position?
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What function does the yarn tensioner serve in the knitting process?
What function does the yarn tensioner serve in the knitting process?
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What is the purpose of the revolution counters in the fabric winding mechanism?
What is the purpose of the revolution counters in the fabric winding mechanism?
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How does the aluminium telescopic tube support the yarn during knitting?
How does the aluminium telescopic tube support the yarn during knitting?
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What is the purpose of the clearing action in the knitting process of a circular machine?
What is the purpose of the clearing action in the knitting process of a circular machine?
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During the yarn feeding process, what happens to the needles?
During the yarn feeding process, what happens to the needles?
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Which of the following indicates that a machine is not cylinder revolving?
Which of the following indicates that a machine is not cylinder revolving?
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What distinguishes the knocking-over action in circular knitting machines?
What distinguishes the knocking-over action in circular knitting machines?
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How do machines like garment length machines differ from other circular machines?
How do machines like garment length machines differ from other circular machines?
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What distinguishes circular knitting machines from flat knitting machines?
What distinguishes circular knitting machines from flat knitting machines?
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Which knitting technique allows for complex fabric patterns to be created?
Which knitting technique allows for complex fabric patterns to be created?
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What is a key feature of garment-length machines?
What is a key feature of garment-length machines?
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Which type of knitting machine is primarily utilized for production efficiency?
Which type of knitting machine is primarily utilized for production efficiency?
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What describes the function of the timing or counting device in garment-length machines?
What describes the function of the timing or counting device in garment-length machines?
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How is fabric production generally separated in weft knitting machines?
How is fabric production generally separated in weft knitting machines?
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What is a common characteristic of single jersey knitting machines?
What is a common characteristic of single jersey knitting machines?
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What kind of fabric do large diameter, circular, latch needle machines produce?
What kind of fabric do large diameter, circular, latch needle machines produce?
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What is the maximum width of machine gauge that can be associated with V-bed knitting machines?
What is the maximum width of machine gauge that can be associated with V-bed knitting machines?
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Which component of a V-bed knitting machine raises and lowers the needles?
Which component of a V-bed knitting machine raises and lowers the needles?
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Which type of needles are typically utilized in V-bed knitting machines?
Which type of needles are typically utilized in V-bed knitting machines?
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What is the primary function of the cam system in a V-bed knitting machine?
What is the primary function of the cam system in a V-bed knitting machine?
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What is one of the benefits of using modern V-bed knitting machines in production environments?
What is one of the benefits of using modern V-bed knitting machines in production environments?
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What range of yarn counts can be knitted on V-bed knitting machines?
What range of yarn counts can be knitted on V-bed knitting machines?
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What feature allows V-bed knitting machines to effectively change machine gauge?
What feature allows V-bed knitting machines to effectively change machine gauge?
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What type of control and display technology is integrated into V-bed knitting machines?
What type of control and display technology is integrated into V-bed knitting machines?
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What mechanism allows circular knitting machines to operate continuously without needing to stop during knitting?
What mechanism allows circular knitting machines to operate continuously without needing to stop during knitting?
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During one revolution of the CAM system in a circular knitting machine with eight systems, how many courses of fabric are completed?
During one revolution of the CAM system in a circular knitting machine with eight systems, how many courses of fabric are completed?
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What determines the maximum number of CAM systems that can be installed around a circular knitting machine?
What determines the maximum number of CAM systems that can be installed around a circular knitting machine?
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What is a significant difference between the CAM systems of a single jersey machine and a double jersey machine?
What is a significant difference between the CAM systems of a single jersey machine and a double jersey machine?
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Which of the following statements is true regarding the operation of multi-system circular knitting machines?
Which of the following statements is true regarding the operation of multi-system circular knitting machines?
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What is the relationship between the number of CAM systems and the production rate of fabric in a circular knitting machine?
What is the relationship between the number of CAM systems and the production rate of fabric in a circular knitting machine?
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What happens when the CAM systems on a circular knitting machine move together?
What happens when the CAM systems on a circular knitting machine move together?
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In circular knitting, what is the primary role of the winding roller?
In circular knitting, what is the primary role of the winding roller?
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What mechanism allows the yarn carriers to move in a straight bar knitting machine?
What mechanism allows the yarn carriers to move in a straight bar knitting machine?
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How does the length of the straight bar machine affect the knitting process?
How does the length of the straight bar machine affect the knitting process?
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What characteristic is notable about the quality of garments produced by straight bar knitting machines?
What characteristic is notable about the quality of garments produced by straight bar knitting machines?
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What is the role of the sinker in the straight bar knitting machine?
What is the role of the sinker in the straight bar knitting machine?
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What is an advantage of using variable draw in straight bar knitting machines?
What is an advantage of using variable draw in straight bar knitting machines?
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What feature limits the applicability of straight bar knitting machines in current fashion trends?
What feature limits the applicability of straight bar knitting machines in current fashion trends?
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What component is essential for the functioning of bearded needle in straight bar knitting machines?
What component is essential for the functioning of bearded needle in straight bar knitting machines?
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Which factor affects the number of courses knitted per minute on straight bar knitting machines?
Which factor affects the number of courses knitted per minute on straight bar knitting machines?
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What occurs during the completion of knock-over in the knitting process?
What occurs during the completion of knock-over in the knitting process?
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How are the needle beds arranged in a V-bed knitting machine?
How are the needle beds arranged in a V-bed knitting machine?
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What is the significance of rib gaiting in V-bed knitting machines?
What is the significance of rib gaiting in V-bed knitting machines?
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What is an advantage of using V-bed knitting machines?
What is an advantage of using V-bed knitting machines?
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What function does the catch bar serve during the knitting process?
What function does the catch bar serve during the knitting process?
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What feature characterizes flatbed purl (links-links) machines?
What feature characterizes flatbed purl (links-links) machines?
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What happens to the fabric after interactions between the yarn and knitting elements in a V-bed machine?
What happens to the fabric after interactions between the yarn and knitting elements in a V-bed machine?
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What is the primary role of the carriage or 'CAM box' in V-bed knitting machines?
What is the primary role of the carriage or 'CAM box' in V-bed knitting machines?
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Study Notes
Introduction to Knitting Machines
- A knitting machine creates knitted fabrics, semi- or fully automated.
- Numerous types exist, ranging from simple non-mechanical to complex electronic.
- All create single jersey or complex jacquard fabrics, either flat or tubular.
- Patterns are selected by needle manipulation or electronically.
- Machines vary in production capacity, from high to low output.
Weft Knitting Machines by End Product
- Grouped according to end product:
- Circular machines: Knit tubular fabric with continuous, uninterrupted length and constant width.
- Flat and circular machines: Knit garment-length sequences, utilize timing/counting devices to initiate additional garment length programming (controlling machine action).
- Fabric machines: Large diameter, circular latch needle machines knit fabrics at high-speed. Fabrics are manually cut and wound after a designated length.
- Garment length machines: Straight bar frames, flats, hosiery, leg wear, glove machines, circular garment machines & sweater strip machines produce knitwear and outerwear. Garment sequence control with timing/counting devices initiates alterations to other parts of the machine to knit to a garment-length sequence (versus continuous fabric).
Weft Knitting Machines by Frame Design & Needle Bed Arrangement
- Three main groups: straight bar frames, flat, circular.
- Classified by frame design and needle arrangements, (straight line/flat bar or circular cylinder).
- Machines can produce single jersey, not double jersey fabrics, using knit, miss, or tuck stitch combinations.
- Double jersey fabrics, like rib and interlock, are produced on both flat bar and circular machines.
Straight Bar Knitting Machine
- Specific type of machine with vertical bar of bearded needles.
- Movement controlled by circular engineering cams attached to a revolving camshaft in the base of the machine.
- Three directions of motion (vertical & horizontal needle bar movement) from two separate sources.
- Rotary motion of camshaft provides vertical & horizontal needle bar movement.
- Variable draw ensures different knitting widths.
- High-speed, highly productive, but expensive machines used for limited, narrow fashion garment manufacture.
- Relatively low fabric tension and gentle knitting action produce high-quality garments.
Parts of Straight Bar Knitting Machine
- Bearded needle: Cranked end for locking in the drilled needle bar.
- Sinker: Reinforces back and front with a 'catch' to sink yarn around needles, and a 'neb' to separate loops.
- Divider: Shape similar to sinker but with an extended back tail.
- Knocking-over bit: Located directly beneath the sinker and divider.
- Needle bar: Compound horizontal/vertical movement.
- Striking jack: Fulcrummed at its lower end, pressing on the sinker’s back.
- Catch bar: Used to move sinkers and dividers in forward/backward direction.
- Yarn carrier: Moves in alternate directions across knitting head using reciprocating carrier rail.
Knitting Action of Straight Bar Knitting Machine
- Sinking: Loop formation around adjacent needles.
- Dividing: Dividing loops into equal-sized needle loops.
- Pressing: New loops are placed inside beard hooks for each needle.
- Landing: Positioning of previously completed loops on knock-over bits.
- Drop-off: Release of loops from the sinker onto knock-over bits.
- Complete knock-over: Release of cycles onto knocking-over slots and lowering of fabric.
- Holding-down: Holding fabric and setting the placement of the next loops.
Flat Knitting Machine
- Two types:
- Flatbed purl (links-links): Horizontal needle beds, using double headed latch needles.
- V-bed rib machine: Two opposing needle beds arranged in a 'V' configuration.
V-Bed Knitting Machine
- Two rib gated needle beds.
- Needles pass between in a V-configuration during loop creation;
- Fabric knit at apex of the V shape, moves downwards between beds.
- Versatile, for a wide variety of knitting with good performance characteristics.
Circular Knitting Machine
- Needle beds arranged as circular cylinders/dials.
- Fabric knitted as a seamless tube.
- Production of many garments, hosiery, and other fabric types and sizes.
- Highly engineered and electronically controlled for high speed and quality.
- Different sizes/diameters available (large, medium, small)
- Some machines use single needle beds, some use two, depending on complexity and type of fabric to be knit.
Parts of Circular Knitting Machine
- Detailed descriptions of many mechanical parts of a circular knitting machine are provided.
Automatic Needle Detector and Fabric Detector
- Detects whether needles are broken or damaged or fabric is torn.
- Fabric detector signals machine stoppage if needed.
Manual Jig and Gate
- Manual jig adjusts sinker, needle, and other elements.
- Gate covers knitted fabric to protect it.
CAM System of Circular Knitting Machine
- Same as flat bed machines, but continuous.
- CAM system is critical for controlling the moment of multiple sets of needles.
- CAM systems allows for production of different types of fabrics and stitches.
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Description
Explore the various types of knitting machines used in fabric production. This quiz covers their functionality, types, and the categorization based on end products. Test your knowledge on how these machines operate and their production capabilities.
