Automatic Spreading Machine (fabric spreading)

AUTOMATIC SPREADING MACHINES

PRESENTED BY :MEGHA CHAWLARIDDHI MALVIYASATYENDRA SINGHB.F.TECH IV

S

Superimpose layers of fabric

Smooth, tension-free

Accurate, efficient cutting

PURPOSE OF SPREADING

Spreading surfaces

•Flat ,smooth surface

Spreading machines

•Manual•Automatic

Fabric control devices during

spreading•Control fabric during spreading

SPREADING EQUIPMENTS :

MANUAL

Speed depends on operator

Used by: small firms;Big firms for small orders

Low productivity

Slower spreading

MANUAL V/S AUTOMATIC

MANUAL

MANUAL V/S AUTOMATIC

AUTOMATIC SPREADING MACHINE

WORKING

Frequency converter system

•Execute computer order precisely

Automatic edge alignment

•Saving materials.

Fabric expanding adjustment

•Crosswise tension ensuring non-wrinkle

Auto shut down •If left idle for more than 5 minutes

FEATURES OF AUTO SPREADING MACHINES :

Touch Panel Display

•Execute computer order precisely

Fabric loading sensor

•Machine returns to original position once fabric runs empty

Emergency Stop Device

•Brake wires are under two sides of table

Manual/Automatic Feeding

•To control the amount of fabric feeding freely

INTELLIGENT EQUIPMENTS AND

FUNCTIONS

Tensioning mechanisms

•Synchronize the rate of spreading with the rate fabric is unrolled

Positioning devices

•Electronic edge sensors monitor selvages as fabric is spread

FABRIC CONTROL DEVICES

Width indicators

•Sound an alarm to alert the operator whenever fabric becomes narrower than the established width

End treatment

systems

•End catcher, roller blade•An overfeed device may be built into the spreading unit, which automatically feeds extra material when a fold is to be made.

FABRIC CONTROL DEVICES

Elements of spreading machine

Frame or carriage

Wheels travelling in guide rails at the edge of the table

Fabric support

Guide collars to aid the correct unrolling of the fabric

Simple spreading machine

The operator clamps the free end of fabric in line with the end of the spread

Pushes the spreader to the other end

Cuts off the ply in line with that end

Clamps the beginning of the next ply

Pushes the spreader to the other end and so on.

advanced spreading machine

Include a motor to drive

The carriage

A platform on which the operator rides

A ply-cutting device with automatic catcher to hold the ends of the ply in place

A turntable

A direct drive on the fabric support, synchronized with the speed of travel, to reduce tension in the fabric being spread.

Specifications of auto spreading machine

Maximum fabric width that can be handled is normally 2 m, although extra wide machines capable of handling up to 3 m are available.

Maximum weight of cloth roll that can be carried by the larger spreading machines is 120 kg

Maximum spreading speed around 100 m/min

Maximum height of spread cloth 28 cm

Dead heading

When a spreading machine dispenses fabric when travelling in one direction but returns to the first end without spreading to begin the next ply, the return pass is known as ‘dead heading’.

Microprocessor control

Enabled the development of more automatic functions

A spreader can be preset to a selected number of plies, emitting an audible signal when it has reached the selected number or has come to the end of a piece of fabric.

Automatic turntabling gives automatic spreading even for corduroys which are normally spread face to face

It repeats the process until it achieves the required number of plies.

This method can be used in conjunction with the automatic sensing of previously marked flaws and damages.

As the flaw moves past the sensor, the spreader will halt, the ply cutter will cut across the ply, the spreader will reverse direction and move back to the nearest splice mark on the marker plan, and then it will continue its run to the end of the ply.

Automatic TURNTABLE

• May use either catchers or a cut-off knife mechanism, and is self powered.

• Requires the spreader to manually rotate the fabric turntable rack when spreading F/F, N/O/W and F/O/W, N/U/D modes of spreading.

Semi-automatic

• Capable of rotating the fabric as wellFully

automatic

Cutting Room Tables

Pin Table

Problems:•Matching of checks and stripes in the garment production has always been difficult and time consuming.•Traditional methods tend to waste a lot of material, since the patterns are cut out with a blocking tolerance.•The task of rearranging the blocked pieces is tedious and expensive.•The workers involved in this process have to be skilled.

Solution:•Each Needle-Bar has pins positioned inside the slots of the table top.•The Needle-Bars can be moved freely along the length of the table. I.e. they can be positioned exactly according to the matching requirements of the marker.•The height of the pins can be adjusted by turning a hand-wheel. So spreading and pinning becomes convenient, fast and avoids tension in the lay package.

Pin Table

Advantages:•Reduce fabric consumption•Improve your efficiency.•Spreading and matching at the same time•Do the fine cutting after spreading without relaying

Solution:•Fabric savings between 3% and 8% can be achieved (depending on the application)•Savings in labour time between 30% and 50%•The demand in the skills of the operators is less.

VACUUM Table

What is a vacuum table?In almost all cases, when you are cutting with automated cutting systems, the fabric is held down using vacuum. Technically the correct thing to say is that the fabric is held down by lowering the pressure in the cutting table and the pressure differential between this and the atmosphere applies a strong and even force to the material on the table. In fact, the pressure differential only needs to be small to give a very high hold-down force.

The vacuum stops the fabric moving while it is being cut, and makes sure the cut pieces stay in place while the rest of the job is being cut. With porous fabric, you cover the fabric with a layer of sacrificial plastic film so the vacuum works properly.

VACUUM Table

Advantages:•It facilitates accurate handling of the material to be cut, thus ensuring easy knife penetration and smooth cutting.• A sensor detects the if any air leakages are present during the cutting phase. •The electronic system regulates the vacuum according to different materials to ensure perfect cutting while maintaining the required pressure.•Faster return on investment and increase in profits.

Air floatation Table

The force required to move a load over a surface is the product of the weight and the coefficient of friction. This resistance to movement can be dramatically reduced by any method that reduces the coefficient of friction.

One such method of reducing the frictional drag is to place a thin film of fluid between the moving load and supporting surface. Air because of its unlimited availability and general characteristics is an ideal fluid.

As a result materials handling can be simplified and made considerably more efficient. In fact, loads weighing hundreds and even thousands of lbs. can be easily conveyed, positioned or manoeuvred by one workman.

Air floatation Table

THANK YOUQuestions Invited