Showing posts with label Knitting. Show all posts
Showing posts with label Knitting. Show all posts
29 December 2012
Weaving and Knitting | Compare/Difference Between Weaving and Knitting
Weaving:
The
method or process of interlacing two yarns of similar materials so that
they cross each other at right angles to produce woven fabric. The warp
yarns, or ends, run lengthwise in the fabric, and the filling threads
(weft), or picks, run from side to side. Weaving can be done on a power or hand loom or by several hand methods.
Knitting:
Knitting:
A method of constructing fabric by interlocking series of loops of one or more yarns. The two major classes of knitting are warp knitting and weft knitting.
http://textilelearner.blogspot.com/2012/04/weaving-and-knitting-comparedifference.html#ixzz2OCbkfA8W
Difference Between Weaving and Knitting
Topics
|
Weaving
|
Knitting
|
1.Definition
|
The fabric forming process by interlacement of warp threads.
|
The fabric forming process by intermeshing of loops.
|
2.Elasticity
|
Very less or no elasticity.
|
The fabric shows high amount of stretch and elasticity due to loop structure.
|
3.Dimentional stability
|
Good dimensional stability which causes less shrinkage.
|
Less dimensional stability.
|
4.Durability
|
More durable
|
Less durable than woven Fabrics.
|
5.Moisture absorption
|
The fabric absorbs less moisture
|
The knitted fabrics absorb more moisture because of their loose construction.
|
6.Slacking and low sening
|
The fabric provides good stability due to intersecting of yarns at right angle.
|
It creates problem after wearing for along time.
|
7.Air permeability
|
Air is less permeable due to compact construction woven fabric.
|
Air permeability is more due to voluminous structure of knitted fabric.
|
8.Crease
|
woven fabrics are more inclined to crease .So ironing and iron retention are better knitted fabric.
|
Knitted fabrics are more resistant to crease. So it requires no ironing.
|
9.Production cost
|
Production cost is more due to warp preparation and desizing process
|
Production cost is less due to modest manufacturing process.
|
10.Yarn
|
TPI of yarn is comparatively higher than knitting yarn.
|
TPI of yarn is comparatively lower than woven fabric.
|
http://textilelearner.blogspot.com/2012/04/weaving-and-knitting-comparedifference.html#ixzz2OCbkfA8W
6 September 2012
How Many Methods of Forming Yarn into Needle Loops
There are three methods of forming the newly-fed yarn into the shape of a needle loop:
1. (Fig. 1) – by sinking the yarn into
the space between adjacent needles usingloop forming sinkers or other
elements which approach from the beard side.Theaction of a straight bar
frame is illustrated. (Other obsolete circular bearded needle machines
such as the sinkerwheel and loopwheel frame employ the sametechnique.)
The distance SL, which the catch of the sinker moves past the beardside of the needle, is approximately half the stitch length,
28 July 2012
Warp and Weft Yarn Preparation | Necessity of Warp/Weft Yarn Preparation
Warp Preparation
Drawing-In
Provides each warp yam with its drop wire, heddle, and reed dent.
Tying- In
When mass producing the same fabric by simply typing each end of a new beam to its corresponding end of the old beam
Necessity of Warp Yarn Preparation
We need to prepare the warp yarn because of:
- Imperfection of yarn.
- Requirement to transfer the spun yarns in a conventional package.
- Extra treatment to make the yarn ready for weaving.
- Warp yarn must be able to withstand destructive forces to which it is subjected during the weaving process.
- Yarn hairiness must be decreases.
- Yarn must be aligned properly.
- Yarn elongation & flexibility must be sustained.
On conventional loom the filling yarn is inserted by means of a shuttle carrying a bobbin. This bobbin should be tapered at the end so that the yarn may be pulled without interruption through the eye of the shuttle as the shuttle travels from one side of the loom to the other.
Necessity of Weft Yarn Preparation
- Removal of slubs & weak places during processing which otherwise would impair the running of the loom.
- The production of the tighter packages having more yards per pirn. This reduces the number of pirn changes in the loom. This, in turn, reduces the possibilities of flaws & wastage.
- Greater uniformity of pirns used on the loom. This improves the uniformity of the fabric. The easy handling of small lots.
27 April 2012
Yarn Preparation for Weaving and Knitting
Definition
Yarn preparation involves those processes that improve the yarn’s weaveability or knittability.
Preparation Requirement for Weaving Yarn:
Warp Yarns
Yarn preparation involves those processes that improve the yarn’s weaveability or knittability.
Preparation Requirement for Weaving Yarn:
Warp Yarns
- Yarns must be aligned properly
- Yarn strength must be increased
- Yarn hairiness must be decreased
- Yarn smoothness must be increased
- Yarn elongation and flexibility must be sustained
Filling Yarns
Yarn must be wound properly and on a suitable package for high speed unwinding
Preparation Requirement for Knitting Yarn:
Weft Knitting
Yarn must be wound properly and on a suitable package for high speed unwinding
Preparation Requirement for Knitting Yarn:
Weft Knitting
- Yarn friction must be decreased
- Fiber shedding must be decreased
- Yarn smoothness must be increased
- Yarn friction must be decreased
- Fiber shedding must be decreased
- Yarn smoothness must be increased
- Yarns must be properly aligned for introduction to knitting needles
7 April 2012
Yarn Preparation for Weaving and Knitting
Definition
Yarn preparation involves those processes that improve the yarn’s weaveability or knittability.
Preparation Requirement for Weaving Yarn:
Warp Yarns
Yarn preparation involves those processes that improve the yarn’s weaveability or knittability.
Preparation Requirement for Weaving Yarn:
Warp Yarns
- Yarns must be aligned properly
- Yarn strength must be increased
- Yarn hairiness must be decreased
- Yarn smoothness must be increased
- Yarn elongation and flexibility must be sustained
Filling Yarns
Yarn must be wound properly and on a suitable package for high speed unwinding
Preparation Requirement for Knitting Yarn:
Weft Knitting
Yarn must be wound properly and on a suitable package for high speed unwinding
Preparation Requirement for Knitting Yarn:
Weft Knitting
- Yarn friction must be decreased
- Fiber shedding must be decreased
- Yarn smoothness must be increased
- Yarn friction must be decreased
- Fiber shedding must be decreased
- Yarn smoothness must be increased
- Yarns must be properly aligned for introduction to knitting needles
23 November 2011
Study on interlock circular knitting machine.
Name of the Experiment: Study on interlock circular knitting machine.
OBJECTS:
1.To have the idea about an interlock m/c .
2.To know about its working principles.
Introduction:
Interlock structure is a double faced Interlock structure which consists of two 1×1 Interlock structures. These two 1×1 Interlock structures are joined by interlocking sinker loops and thus produce interlock structure. Interlock structure is produce by special cylinder dial circular machines. Double system V-bed flat knitting machine also used to produce interlock structure.
SPECIFICATIONS:
1.Yarn career
2.Break stop motion
3.Yarn guides
4.Dial
5.Cylinder
6.Dial cams
7.Cylinder cams
8.Dial needles
9.Cylinder needles
10.Oiling and air following devices
11.Sensors
12.Take up rollers
13.Batch rollers
14.Motor
15.Belts 16.Clutches
17.Pulleys and gears
http://textilelearner.blogspot.com/2012/01/interlock-circular-knitting-machine.html#ixzz2OGB7HyU0
OBJECTS:
1.To have the idea about an interlock m/c .
2.To know about its working principles.
Introduction:
Interlock structure is a double faced Interlock structure which consists of two 1×1 Interlock structures. These two 1×1 Interlock structures are joined by interlocking sinker loops and thus produce interlock structure. Interlock structure is produce by special cylinder dial circular machines. Double system V-bed flat knitting machine also used to produce interlock structure.
SPECIFICATIONS:
- Machine name: Interlock Circular Knitting Machine.
- Company:- Precision FUKUHARA Works Limited.
- Origin of the machine:- Japan
- Model no. :- V 8ME 42
- Dia of the machine:- 30”.
- Gauge of the machine:- 22
- No of Feeder:- 84
- Serial no:- 1352761.
- Creel Capacity: 84.
- Feeding: Positive.
2.Break stop motion
3.Yarn guides
4.Dial
5.Cylinder
6.Dial cams
7.Cylinder cams
8.Dial needles
9.Cylinder needles
10.Oiling and air following devices
11.Sensors
12.Take up rollers
13.Batch rollers
14.Motor
15.Belts 16.Clutches
17.Pulleys and gears
Machine description:
The machine has two sets of needles on two different beds, one set on cylinder one in the dial bed. These two sets of needles must be exactly opposite to each other.
The machine has two separate cam system in each bed needles of different length called short needles and long needles. Each cam system controls half of the needles in alternate sequences. One cam system controls knitting at one feeder and other ca, system controls at the next feeders. T ale down mechanism is the same as the other Interlock and plain machines mechanism.
Interlock cam system:
In the figure the cylinder and dial camming to produce one course of ordinary interlock fabric which is actually work of two knitting feeders.
The cylinder cam:
A → clearing cam which lifts the needles to clear the old loop
B, C → stitch cam and guard cams respectively both vertically adjustable to control the stitch length.
D → up through to rise the needle whilst dial needle knock over
E, F → guard cam to complete the truck
G, H → guide cam to provide the track for idling needles
The dial system:
1. Raising cam for tuck position only
2, 3. Dial knock over cam
4. Guard cam to compete the truck
5. Auxiliary knock over cam to prevent the dial needle reentering the old loop
6, 7 Guide cams provides the tracks for idling needles
8. Sewing type clearing cam which may occupy the knitting position as shown in feeder 1 or in tuck position at feeder 2.
Machine parts:
The machine has two sets of needles on two different beds, one set on cylinder one in the dial bed. These two sets of needles must be exactly opposite to each other.
The machine has two separate cam system in each bed needles of different length called short needles and long needles. Each cam system controls half of the needles in alternate sequences. One cam system controls knitting at one feeder and other ca, system controls at the next feeders. T ale down mechanism is the same as the other Interlock and plain machines mechanism.
Interlock cam system:
In the figure the cylinder and dial camming to produce one course of ordinary interlock fabric which is actually work of two knitting feeders.
The cylinder cam:
A → clearing cam which lifts the needles to clear the old loop
B, C → stitch cam and guard cams respectively both vertically adjustable to control the stitch length.
D → up through to rise the needle whilst dial needle knock over
E, F → guard cam to complete the truck
G, H → guide cam to provide the track for idling needles
 |
| Cylinder Cam System |
1. Raising cam for tuck position only
2, 3. Dial knock over cam
4. Guard cam to compete the truck
5. Auxiliary knock over cam to prevent the dial needle reentering the old loop
6, 7 Guide cams provides the tracks for idling needles
8. Sewing type clearing cam which may occupy the knitting position as shown in feeder 1 or in tuck position at feeder 2.
Machine parts:
- Yarn career
- Break stop motion
- Yarn guides
- Dial
- Cylinder
- Dial cams
- Cylinder cams
- Dial needles
- Cylinder needles
- Oiling and air following devices
- Sensors
- Take up rollers
- Batch rollers
- Motor
- Belts
- Pulleys and gears Clutches
Knitting action:
Conclusion:
The circular Interlock machine is a very commonly used machine in country to make Interlock knitted fabric. So this experiment has significance in our study life. In this experiment we sketch the yarn path diagram of the machine, show the knitting action, cam system. We point out the various specification of the machine. So the experiment helps us to know more.
Above all the experiment is a successful one.
The circular Interlock machine is a very commonly used machine in country to make Interlock knitted fabric. So this experiment has significance in our study life. In this experiment we sketch the yarn path diagram of the machine, show the knitting action, cam system. We point out the various specification of the machine. So the experiment helps us to know more.
Above all the experiment is a successful one.
http://textilelearner.blogspot.com/2012/01/interlock-circular-knitting-machine.html#ixzz2OGB7HyU0
22 March 2011
Study on compare between single jersey single truck (conventional) and single jersey four truck circular knitting m/c.
Experiment name: Study on compare between single jersey single truck (conventional) and single jersey four truck circular knitting m/c.
Object:
To know about the difference between single jersey single truck and single jersey four truck circular knitting m/c.
To know about modern development of single jersey four truck knitting m/c.
To know about the problematic area of single jersey single truck knitting m/c.
Introduction:
Single jersey circular knitting m/c is a common m/c in knitting industry. More than 70% of knitted fabric is produced in single jersey m/c. In conventional m/c there is only one cam truck. So we can produce only basic single jersey fabric in this m/c. But in modern m/c there is four truck in the cylinder. So we can produce maximum 4 (four) wales in a repeat. To produce more than 4 wales in a repeat we need jacquard mechanism.
Comparison between single jersey single truck (conventional) and single jersey four truck circular knitting m/c:
Subject:
Single jersey single truck (conventional) circular knitting m/c.
Single jersey four truck circular knitting m/c.
Cam truck
1. One truck.
1. Four truck.
Needle
2. Double butt needle.
2. Single butt needle.
Butt position
3. Same position.
3. Different position.
Feed system
4. Negative Feed System.
4. Positive feed System.
Creel System
5. Over head creel.
5. Side creel.
Cam System
6. Open Cam system.
6. Close Cam system.
7. Open knitting m/c.
7. Close knitting m/c.
Take down
8. Conventional.
8. Modern.
Needle gauge
9. Coarser gauge.
9. Fine gauge.
M/c diameter.
10. This m/c is small diameter.
10. This m/c is large diameter.
11. Basic single jersey fabric is produced.
11. Basic single jersey fabric is produced.
Conclusion:
This is very important to know about the difference between single truck and four truck m/c. This is vastly used in knitting industry. So we need knowledge about this m/c.
http://textilelearner.blogspot.com/2012/02/compare-between-single-jersey-single.html#ixzz2OGAaZ5WH
Object:
To know about the difference between single jersey single truck and single jersey four truck circular knitting m/c.
To know about modern development of single jersey four truck knitting m/c.
To know about the problematic area of single jersey single truck knitting m/c.
Introduction:
Single jersey circular knitting m/c is a common m/c in knitting industry. More than 70% of knitted fabric is produced in single jersey m/c. In conventional m/c there is only one cam truck. So we can produce only basic single jersey fabric in this m/c. But in modern m/c there is four truck in the cylinder. So we can produce maximum 4 (four) wales in a repeat. To produce more than 4 wales in a repeat we need jacquard mechanism.
Comparison between single jersey single truck (conventional) and single jersey four truck circular knitting m/c:
Subject:
Single jersey single truck (conventional) circular knitting m/c.
Single jersey four truck circular knitting m/c.
Cam truck
1. One truck.
1. Four truck.
Needle
2. Double butt needle.
2. Single butt needle.
Butt position
3. Same position.
3. Different position.
Feed system
4. Negative Feed System.
4. Positive feed System.
Creel System
5. Over head creel.
5. Side creel.
Cam System
6. Open Cam system.
6. Close Cam system.
7. Open knitting m/c.
7. Close knitting m/c.
Take down
8. Conventional.
8. Modern.
Needle gauge
9. Coarser gauge.
9. Fine gauge.
M/c diameter.
10. This m/c is small diameter.
10. This m/c is large diameter.
11. Basic single jersey fabric is produced.
11. Basic single jersey fabric is produced.
Conclusion:
This is very important to know about the difference between single truck and four truck m/c. This is vastly used in knitting industry. So we need knowledge about this m/c.
http://textilelearner.blogspot.com/2012/02/compare-between-single-jersey-single.html#ixzz2OGAaZ5WH
25 January 2011
Production Calculation From Loop Length
Production Calculation From Loop Length:
Let us consider a circular Single Jersey knitting machines , having F no of Feeder and N no of needles , is running with a speed of n r.p.m and producing a fabrics of loop length ‘l’ mm .
Hence , no of courses produced in 1 rev. = F
no of courses produced in n ,, = F.n
no of courses produced in 1 min. = F.n
no of courses produced in 1 hr = F.n.60
As loop length in ‘l’ mm and the total no needle are N
Let us consider a circular Single Jersey knitting machines , having F no of Feeder and N no of needles , is running with a speed of n r.p.m and producing a fabrics of loop length ‘l’ mm .
Hence , no of courses produced in 1 rev. = F
no of courses produced in n ,, = F.n
no of courses produced in 1 min. = F.n
no of courses produced in 1 hr = F.n.60
As loop length in ‘l’ mm and the total no needle are N
 |
| Circular knitting machine |
yarn consumed by 1 needle from 1 hr = F.n.60.l mm
yarn consumed by N needle from 1 hr = F.n.60.l.N mm
= F.n.60.l.N/1000 meter
Total yarn consumed by the m/c in 1 hr = F.n.60.l.N/1000 meter
If yarn count is Nm , then the weight of above yarn = F.n.60.l.N/1000.Nm.1000 Kg
For Example:
Problem: Calculate the production for a circular knitting machine whith the given data
Feeder=84
Diameter=30 inch
Gauge=24/inch
Cylinder r.p.m=18
Yarn count=30Ne
Efficiency=90%
Stitch length=2 mm
Solution:
Length of yarn=(3.14×30× 24× 2 ×84× 18× 60 ×24 ×90)/(1000 ×100)
=8860310.32 meter
=8860.31 km
Now, 20Ne=Ne×tex=590.6
So,tex=590.6/20
=29.58
Again,
1 km yarn weight =29.53 gm
8860.31 km yarn weight=(29.53× 8860.31)
=261.64 kg
23 December 2010
Study on Rib Circular knitting machine.
Name of the experiment: Study on Rib Circular knitting machine.
In rib circular knitting m/c, Rib gaiting:
Knitting action:
The knitting action of a circular rib machine is shown in Fig:
1. Clearing: The cylinder and dial needles move out to clear the plain and rib loops formed in the previous cycle.
2. Yarn feeding: The needles are withdrawn into their tricks so that the old loops are covered by the open latches and the new yarn is fed into the open hooks.
3. Knocking Over: The needles are withdrawn into their tricks so that the old loops are cast off and new loops are drawn through them.
Conclusion:
This experiment has significance in our study life. In this experiment we sketch the yarn path diagram of the machine, show the knitting action, cam system. We point out the various specification of the machine.
Introduction
The
structure in which the face and back loop occurs along to the coarse
successively but all the loops of a wale is same is called rib
structure. The circular knitting machine which is used to produce the rib structures is known as rib machine.
Machine specification:
In a dial cylinder rib machine there is one set of needles on the circumference of the vertical cylinder and another set of needles on a horizontal dial. So two sets of needles remain at the right angle with each other. In dial cylinder machines the dial and cylinder rotates but the cam systems with the feeders remain stationary.
The dial needles get its motion from its butt which is placed on the cam truck. This cam truck is formed by different cam placed on a cam plate.
During the rotation of the cylinder, cylinder needles moves vertically and dial needles moves horizontally. Cylinder needles also get its motion from it. There is a cloth tale up roller which also rotates with unison to dial and cylinder and fabric is wound on it.
Machine specification:
- Machine model → cmoan
- Manufacturer → Paolo Orizio
- Made in → Italy
- No of feeders’ → 40
- Cylinder diameter →20”
- Needle gauge → 18 / inch
- Yarn career
- Break stop motion
- Yarn guides
- Dial
- Cylinder
- Dial cams
- Cylinder cams
- Dial needles
- Cylinder needles
- Oiling and air following devices
- Sensors
- Take up rollers
- Batch rollers
- Motor
- Belts
- Pulleys and gears
- Clutches
In a dial cylinder rib machine there is one set of needles on the circumference of the vertical cylinder and another set of needles on a horizontal dial. So two sets of needles remain at the right angle with each other. In dial cylinder machines the dial and cylinder rotates but the cam systems with the feeders remain stationary.
The dial needles get its motion from its butt which is placed on the cam truck. This cam truck is formed by different cam placed on a cam plate.
During the rotation of the cylinder, cylinder needles moves vertically and dial needles moves horizontally. Cylinder needles also get its motion from it. There is a cloth tale up roller which also rotates with unison to dial and cylinder and fabric is wound on it.
In rib circular knitting m/c, Rib gaiting:
The knitting action of a circular rib machine is shown in Fig:
1. Clearing: The cylinder and dial needles move out to clear the plain and rib loops formed in the previous cycle.
2. Yarn feeding: The needles are withdrawn into their tricks so that the old loops are covered by the open latches and the new yarn is fed into the open hooks.
3. Knocking Over: The needles are withdrawn into their tricks so that the old loops are cast off and new loops are drawn through them.
 |
| Fig: Knitting action of rib circular knitting machine |
This experiment has significance in our study life. In this experiment we sketch the yarn path diagram of the machine, show the knitting action, cam system. We point out the various specification of the machine.
22 December 2010
Compare between Rib & Interlock circular knitting machine.
Experiment name: Compare between Rib & Interlock circular knitting machine.
Objects:
--To know difference between Interlock circular & rib circular knitting m\c.
--To know similarities between these m\cs.
--To identify the Interlock circular & rib circular knitting m\c.]
Machine specification:
Interlock circular knitting machine.
Company:- Precision FUKUHARA Works Limited.
Origin of the machine:- Japan
Model no. :- V – 8ME-- 42
Dia of the machine:- 30”.
Gauge of the machine:- 22
No of Feeder:- 84
Serial no:- 1352761
Rib circular knitting machine.
Company:- ORIZIO POALO SPA
Origin of the machine:- ITALY.
Model no. :- CMOAN
Serial no:- 1026338
Dia of the machine:- 20”
Gauge of the machine:- 18
No of Feeder :- 40
No of Needle:- 1128
Rib circular knitting machine
Interlock circular knitting machine
Top side is closed.
1. Top side is closed.
Cylinder & dial are used in this m/c
2. Cylinder & dial are used in this m/c
Two set needle used one for cylinder and one for dial.
3. Two set needle used one for cylinder and for dial.
2-butt cylinder needle optional present here. 2-butt dial neddle used in this machine. 2-cam truck optional but single cam truck used in the cylinder and 2-cam truck used in the dial.
4. 4-butt cylinder needle & 2-butt dial needle, 4-cam truck in the cylinder &2-cam truck in the dial used in this machine.
Sinker not used in this type of machine.
5. Sinker not used in this type of machine.
Neddle detector and fabric detector are present.
6. Needle detector & fabric ditector are present or not present.
Positive type of feeder used in this machine.
7. Positive/Negative type of feeder used in this machine.
Synchronized timing.
8. Delay timing.
Side creel used in this machine.
9. Side/Over head creel used in this machine.
Cylinder & dial are present:
10. Cylinder & dial are present:
Cam arrangement like:
11. Cam arrangement like:
Chain notation:
12. Chain notation:
http://textilelearner.blogspot.com/2012/01/rib-circular-knitting-machine-interlock.html#ixzz2OGfEIxNR
Objects:
--To know difference between Interlock circular & rib circular knitting m\c.
--To know similarities between these m\cs.
--To identify the Interlock circular & rib circular knitting m\c.]
Machine specification:
Interlock circular knitting machine.
Company:- Precision FUKUHARA Works Limited.
Origin of the machine:- Japan
Model no. :- V – 8ME-- 42
Dia of the machine:- 30”.
Gauge of the machine:- 22
No of Feeder:- 84
Serial no:- 1352761
Rib circular knitting machine.
Company:- ORIZIO POALO SPA
Origin of the machine:- ITALY.
Model no. :- CMOAN
Serial no:- 1026338
Dia of the machine:- 20”
Gauge of the machine:- 18
No of Feeder :- 40
No of Needle:- 1128
Rib circular knitting machine
Interlock circular knitting machine
Top side is closed.
1. Top side is closed.
Cylinder & dial are used in this m/c
2. Cylinder & dial are used in this m/c
Two set needle used one for cylinder and one for dial.
3. Two set needle used one for cylinder and for dial.
2-butt cylinder needle optional present here. 2-butt dial neddle used in this machine. 2-cam truck optional but single cam truck used in the cylinder and 2-cam truck used in the dial.
4. 4-butt cylinder needle & 2-butt dial needle, 4-cam truck in the cylinder &2-cam truck in the dial used in this machine.
Sinker not used in this type of machine.
5. Sinker not used in this type of machine.
Neddle detector and fabric detector are present.
6. Needle detector & fabric ditector are present or not present.
Positive type of feeder used in this machine.
7. Positive/Negative type of feeder used in this machine.
Synchronized timing.
8. Delay timing.
Side creel used in this machine.
9. Side/Over head creel used in this machine.
Cylinder & dial are present:
10. Cylinder & dial are present:
Cam arrangement like:
11. Cam arrangement like:
Chain notation:
12. Chain notation:
http://textilelearner.blogspot.com/2012/01/rib-circular-knitting-machine-interlock.html#ixzz2OGfEIxNR
21 December 2010
Study on knitting action of Tricot warp knitting machine.
Experiment Name: Study on knitting action of Tricot warp knitting machine.
Introduction:
The warp knitting machine is a knitting m/c where the loops are formed in course wise direction and the fabric produced is in open width form. In Tricot warp knitting m/c compound needles are used. The warp yarns are feed to the needles through guide bars using shogging and swinging motion.
M/C specification:
1. The rest position: Te needles have risen to 2/3 of their full height from knock-over and have their hooks towards the back of the m/c. The latch bar is in downward position and the guides are at the front of the m/c with the sinkers forward, holding the old overlaps in their throats so that they are maintained in the correct height on the needle stems.
2. Needle rise and guide bar swing: With the sinkers forward holding down the fabric, the hooks and tongues rise, with the hook rising faster, until the head of the latter is level with the guide holes and is open. The guides then swing through to the back of the m/c.
3. The overlap and return swing: The guide’s shog for the overlap and swing to the front of the m/c immediately. The hooks and the tongues start to descend with the tongues descending more slowly, thus closing the hook.
4. Hook closing: The hooks and the tongues start to descend with the tongues descending more slowly, thus closing the hook
5. Landing: The sinkers start to withdraw as the needles descend so that the old loop is landed onto the closed hook. Thus the landing is occurred.
6. Knock-over and under lap: The sinkers start to withdraw as the needles descend so that the old loop is landed onto the closed hook and then knocked over as it descends below the sinker belly. At this point the under lap occurs before the needles begin their upward rise and sinker move forward to hold down the fabric.
7. The sinkers now move forward to hold down the fabric loops and push them away from the ascending needles, which are rising to the rest position.
Conclusion:
The knitting action of the Tricot warp knitting m/c is done by the needles, its sliding latches and the guide bars. The main work of feeding the thread around the needle is done by guides with their shogging and swinging motions. By this experiment I learned about the knitting action of a tricot warp knitting machine. This experience will help me in my future practical life.
Introduction:
The warp knitting machine is a knitting m/c where the loops are formed in course wise direction and the fabric produced is in open width form. In Tricot warp knitting m/c compound needles are used. The warp yarns are feed to the needles through guide bars using shogging and swinging motion.
M/C specification:
- Brand: LIBA
- Origin: W. Germany
- Manufacturing Company: MASCHINEN FABRIK, NAILA.
- Manufacturing Year: 1991
- Width: 84 inch/ 213 cm
- Type: COP 2K
- Gauge: 28
1. The rest position: Te needles have risen to 2/3 of their full height from knock-over and have their hooks towards the back of the m/c. The latch bar is in downward position and the guides are at the front of the m/c with the sinkers forward, holding the old overlaps in their throats so that they are maintained in the correct height on the needle stems.
2. Needle rise and guide bar swing: With the sinkers forward holding down the fabric, the hooks and tongues rise, with the hook rising faster, until the head of the latter is level with the guide holes and is open. The guides then swing through to the back of the m/c.
3. The overlap and return swing: The guide’s shog for the overlap and swing to the front of the m/c immediately. The hooks and the tongues start to descend with the tongues descending more slowly, thus closing the hook.
4. Hook closing: The hooks and the tongues start to descend with the tongues descending more slowly, thus closing the hook
5. Landing: The sinkers start to withdraw as the needles descend so that the old loop is landed onto the closed hook. Thus the landing is occurred.
6. Knock-over and under lap: The sinkers start to withdraw as the needles descend so that the old loop is landed onto the closed hook and then knocked over as it descends below the sinker belly. At this point the under lap occurs before the needles begin their upward rise and sinker move forward to hold down the fabric.
7. The sinkers now move forward to hold down the fabric loops and push them away from the ascending needles, which are rising to the rest position.
Conclusion:
The knitting action of the Tricot warp knitting m/c is done by the needles, its sliding latches and the guide bars. The main work of feeding the thread around the needle is done by guides with their shogging and swinging motions. By this experiment I learned about the knitting action of a tricot warp knitting machine. This experience will help me in my future practical life.
14 December 2010
Study on pattern mechanism of Tricot warp knitting machine.
Experiment Name: Study on pattern mechanism of Tricot warp knitting machine.
Introduction:
The warp knitting machine is a knitting m/c where the loops are formed in course wise direction and the fabric produced is in open width form. In Tricot warp knitting m/c compound needles are used. The warp yarns are feed to the needles through guide bars using shogging and swinging motion which is done by patterning drum and chain links with a mechanism called patterning mechanism.
M/C specification:
The shogging movement is initiated by varying the radius of the continuously turning pattern shaft either in the form of different heights of pattern links which poses over a pattern drum attached to the shaft or in the form of carefully shaped solid metal circular cams, termed pattern wheels, attached to it. An increase in height one link to the next produces a thrust against the end of the guide by shogging it positively into the m/c a decrease will produce a negative shog towards the pattern shaft as the result of the action of a return spring. A constant height will produce no shog if the guide bar will continued to swing through the same needle space. The periphery of the pattern wheel or chain track is scanned by a roller which is link by a flexible jointed push-rod to the end of the guide bar. The under side of the rod near the roller is supported on the side with moves freely or a metal surface as shogging occurs.
Conclusion:
By this experiment I learned about the Tricot warp knitting m/c and their several parts with pattering mechanism and chain links. This is a modern m/c and so this experience will help me in my future practical life.
Introduction:
The warp knitting machine is a knitting m/c where the loops are formed in course wise direction and the fabric produced is in open width form. In Tricot warp knitting m/c compound needles are used. The warp yarns are feed to the needles through guide bars using shogging and swinging motion which is done by patterning drum and chain links with a mechanism called patterning mechanism.
M/C specification:
- Brand: LIBA
- Origin: W. Germany
- Manufacturing Company: MASCHINEN FABRIK, NAILA.
- Manufacturing Year: 1991
- Width: 84 inch/ 213 cm
- Type: COP 2K
- Gauge: 28
The shogging movement is initiated by varying the radius of the continuously turning pattern shaft either in the form of different heights of pattern links which poses over a pattern drum attached to the shaft or in the form of carefully shaped solid metal circular cams, termed pattern wheels, attached to it. An increase in height one link to the next produces a thrust against the end of the guide by shogging it positively into the m/c a decrease will produce a negative shog towards the pattern shaft as the result of the action of a return spring. A constant height will produce no shog if the guide bar will continued to swing through the same needle space. The periphery of the pattern wheel or chain track is scanned by a roller which is link by a flexible jointed push-rod to the end of the guide bar. The under side of the rod near the roller is supported on the side with moves freely or a metal surface as shogging occurs.
Conclusion:
By this experiment I learned about the Tricot warp knitting m/c and their several parts with pattering mechanism and chain links. This is a modern m/c and so this experience will help me in my future practical life.
7 December 2010
Study on Crochet Warp knitting machine.
Experiment name: Study on Crochet Warp knitting machine.
Objectives:
Objectives:
- To get clear concept about the driving mechanism of crotchet knitting machine.
- To know the functions of different parts of the machine.
- To know about the different motions of the machine.
- To know different parts of the machine.
- To improve our technical knowledge.
- Company: DAH HEER Industrial Co. LTD.
- Brand: DAHU.
- Origin: Taiwan.
- Model No: L
- Size: 15 G
- Motor
- Main shaft
- Size lever
- Shogging motion lever
- Weft yarn guide bar
- Warp yarn guide bar
- Needle bar
- Needle
- Pressure roller
- Take up roller
- Ratchet wheel
Machine description:
The machine is driven by an electric motor. Motion is transferred to the machine parts by gear and toothed belt. Here weft yarn guide bar gives to and fro motion and shogging motion. Shogging motion lever give motion to the weft yarn guide bar. Shogging motion is driven from motor by main shaft. Needle bar and warp yarn guide bar also give to and fro and shogging motion by the same mechanism.Take up roller has ratchet wheel, by which take up roller gets motion from the motor by pushing pawl amd some mechanism.
Conclusion:
First of all I would like to offer my heartily thanks to our supervising tutor and the lab assistants for their consistent help to complete the study properly. Crotchet knitting machine is one of the most important knitting machines to produce knitted fabric.
The machine is driven by an electric motor. Motion is transferred to the machine parts by gear and toothed belt. Here weft yarn guide bar gives to and fro motion and shogging motion. Shogging motion lever give motion to the weft yarn guide bar. Shogging motion is driven from motor by main shaft. Needle bar and warp yarn guide bar also give to and fro and shogging motion by the same mechanism.Take up roller has ratchet wheel, by which take up roller gets motion from the motor by pushing pawl amd some mechanism.
Conclusion:
First of all I would like to offer my heartily thanks to our supervising tutor and the lab assistants for their consistent help to complete the study properly. Crotchet knitting machine is one of the most important knitting machines to produce knitted fabric.
30 November 2010
Introduction of Under Lap | Closed Lap | Open Lap
The Under Lap
The underlap shog occurs across the side of the needles remote from the hooks on the front of single-needle
bar, and in the centre of double-needle bar, warp knitting machines. It
supplies the warp yarn between one overlap and the next (Fig.A).The
underlap shog generally ranges from 0 to 3 needle spaces, but it might
be 14 needle spaces or more depending upon the design of the machine and
the fabric structure (although efficiency and production speed will be
correspondingly reduced with long underlaps).
Underlaps as well as
overlaps are essential in warp knitted structures in order to join the
wales of loops together but they may be contributed by different guide
bars.
The Closed Lap
A closed lap is produced when a subsequent underlap shogs in the opposite direction to the preceding overlap, thus lapping the same yarn around the back as well as around the front of the needle (Fig.B).
The Open Lap
An open lap is produced either when a subsequent underlap is in the same direction as the preceding overlap (Fig.C) or an underlap is omitted so that the overlap of the next knitting cycle commences in the needle space where the previous overlap finished. Closed laps are heavier, more compact, more opaque, and less extensible than open laps produced from the same yarn at a comparable knitting quality.
 |
| A.Under lap shog |
The Closed Lap
A closed lap is produced when a subsequent underlap shogs in the opposite direction to the preceding overlap, thus lapping the same yarn around the back as well as around the front of the needle (Fig.B).
 |
| B.Closed Lap |
An open lap is produced either when a subsequent underlap is in the same direction as the preceding overlap (Fig.C) or an underlap is omitted so that the overlap of the next knitting cycle commences in the needle space where the previous overlap finished. Closed laps are heavier, more compact, more opaque, and less extensible than open laps produced from the same yarn at a comparable knitting quality.
24 November 2010
Knitting Cam | Function of Knitting Cam | Action of Knitting Cam
CAM:
Knitting cams are attached either individually or in unit form to a cam plate and depending upon the machine design, are fixed exchangeable or adjustable. At each of at least a raising cam, a stitch cam and an up throw cam whose combined effect is required. Usually four main types of knitting cams are used.
i. Raising cam: The raising cam causes the needle to be lifted to either tuck, clearing loop transfer or needle transfer depending upon machine design.
ii. Stitch cam: The stitch cam controls the depth to which the needle descends thus controlling the amount of yarn drawn in to the needle loop. It al so a knock-over cam.
iii. Up throw or counter cam: The up throw or counter cam takes the needles back to the rest position and allows the formed loops to relax.
iv. Guard cam: The guard cam is often placed on the butts and to prevent needles from falling out of track.
Function of Cam: The functions of cam are as follows
a. Engineering ----------------------- Circular type
b. Knitting ------------------------------- Angular motion
Engineering cam are 4 types :
Cams are the devices , which convert the rotary machine drive in to a suitable reciprocating action for the needles and other elements. In general there are two types of cams.
In warp knitting machines four Types of cam have been employed.
Knitting Cam: The knitting cam is of angular type and acts directly on to the butt of needles or other elements to produce individual movement in the tricks of needle weft knitting machine as the butts pass through the stationary cam system or the cams pass across the stationary tricks.
- Engineering cam.
- Knitting cam.
In warp knitting machines four Types of cam have been employed.
- Single acting cams
- Cam and counter cam
- Box cam or enclosed cam
- Counter cam/ring cam/pot cam
Knitting Cam: The knitting cam is of angular type and acts directly on to the butt of needles or other elements to produce individual movement in the tricks of needle weft knitting machine as the butts pass through the stationary cam system or the cams pass across the stationary tricks.
 |
| Knitting cam |
i. Raising cam: The raising cam causes the needle to be lifted to either tuck, clearing loop transfer or needle transfer depending upon machine design.
ii. Stitch cam: The stitch cam controls the depth to which the needle descends thus controlling the amount of yarn drawn in to the needle loop. It al so a knock-over cam.
iii. Up throw or counter cam: The up throw or counter cam takes the needles back to the rest position and allows the formed loops to relax.
iv. Guard cam: The guard cam is often placed on the butts and to prevent needles from falling out of track.
Function of Cam: The functions of cam are as follows
- To produce motion to needles .
- To drive the needles.
- Formation of loops.
a. Engineering ----------------------- Circular type
b. Knitting ------------------------------- Angular motion
Engineering cam are 4 types :
- Single active .
- Cam and counter cam .
- Box cam .
- Counter cam / pot cam .
- Stitch cam .
- Raising cam .
- Up throw cam .
- Guard cam .
- Rest position .
- Clear position .
- Yarn feeding position .
- Knock – over –position .
- Holding Down position .
Introduction of Warp Knitting | Principle of Warp Knitting | Properties of Warp Knitted Structures
Warp Knitting
Warp knitted fabric is knitted at a constant continuous width, although it is possible to knit a large number of narrow width fabrics within a needle bed width, usually separating them after finishing. There is considerable potential for changing fabric properties during the finishing process, as well as during knitting. It is also possible to produce length sequences such as scarves with fringed ends, articles produced on double needle bar raschels based on the tubular knitting principle, and scalloped shaping of net designs by cutting around the outline after finishing.
 |
| Fig: Warp Knitting |
The Properties of Warp Knitted Structures
Warp knitting offers:
Warp knitting offers:
- Higher production rates than for weaving.
- A wide variety of fabric constructions.
- Large working widths.
- A low stress rate on the yarn that facilitates careful handling of fibres such as glass, aramide and carbon (particularly when using weft-insertion techniques).
- Conventional warp knitted structures that can be directionally structured.
- Three-dimensional structures that can be knitted on double needle bar raschels.With weft insertion, uni-axial, bi-axial, multi-axial and composite structures that can be manufactured on single needle bar raschels.
Compound lapping movements are responsible for the production of warp knitted fabric. The compound lapping movement is composed of two separate motion.
The no. of pattern wheels or no. of endless pattern chain links will be equal to the no. of guide bars used. The lateral movement of the guide bars along the needle bars or parallel to the needle baris called a shogging motion. The amount of yarn supplied to the guide bar for a definite number of courses iscalled run-in or amount of yarn required (inch ) to 480 courses ( 1 rack ) is termed as run-in.
The ratio of Run-in between two guide bars is termed as
Run-in ratio:
- Swinging motion (backward & forward motion)
- Shogging motion (the lateral motion or side way movement )
The no. of pattern wheels or no. of endless pattern chain links will be equal to the no. of guide bars used. The lateral movement of the guide bars along the needle bars or parallel to the needle baris called a shogging motion. The amount of yarn supplied to the guide bar for a definite number of courses iscalled run-in or amount of yarn required (inch ) to 480 courses ( 1 rack ) is termed as run-in.
The ratio of Run-in between two guide bars is termed as
Run-in ratio:
Run-in ratio is related to the loop length & structure of fabric & thus the appearance & knitting performance
Compare between Mechanical Interlock & Electrical Interlock circular knitting machine.
Experiment Name: Compare between Mechanical Interlock & Electrical Interlock circular knitting machine.
Objects:
--To know difference between Mechanical Interlock & Electrical Interlock circular knitting m\c.
--To know similarities between these m\cs.
--To identify the Mechanical Interlock & Electrical Interlock circular knitting m\c.
Machine specification:
Mechanical Interlock Circular Knitting Machine
Objects:
--To know difference between Mechanical Interlock & Electrical Interlock circular knitting m\c.
--To know similarities between these m\cs.
--To identify the Mechanical Interlock & Electrical Interlock circular knitting m\c.
Machine specification:
Mechanical Interlock Circular Knitting Machine
- Brand: MYK
- Model: FILS
- Origin: Japan
- Manufacturing company: MIYAKE KNITTING MACHINE W. LTD.
- Manufacturing year: 1965
- Serial: 1289/3
- Dia of cylinder: 17 inch
- Needle Gauge: 20
- No of feeder: 20
- No. of needle: 204
- Motor Rpm: 1430
- Brand: FUKUHARA
- Model: V8ME42
- Origin: Japan
- Manufacturing Company: Precision Fukuhara Works. Ltd.
- Serial: 1352761
- Dia of cylinder: 30 inch
Mechanical Interlock
|
Electronic Interlock
|
1. Top side is closed.
|
|
2. Cylinder & dial are used in this m/c
|
|
3. Two set needle used one for cylinder
and one for dial.
|
|
4. 2-butt cylinder needle & 2-butt dial needle, 2-cam truck in the cylinder &2-cam truck in the dial used in this machine.
|
|
5. Sinker not used in this machine.
|
|
6. Needle detector & fabric ditector are not present.
|
|
7. Negative feeder.
|
|
8. Delay timing are used
|
|
|
9. Side creel used.
|
10. Cylinder and dial are present.
|
|
11. Cam arrangement like:
|
|
12. Looping diagram is like:
|
|
Conclusion:
It is a very important experiment for us. It is very helpful in our student life.
Subscribe to:
Posts
(Atom)