1. The document discusses various components and functions of feed mechanisms in sewing machines. It defines a feed mechanism as the process that moves fabric forward in the sewing machine's feeding zone.
2. Key parts of a feed mechanism are identified as the throat plate, feed dogs, and pressure foot. The functions of a feed mechanism include advancing fabric, controlling stitch quality and density, and preventing sewing faults.
3. Different types of feed mechanisms are described, including drop feed, differential bottom feed, adjustable top feed, needle feed, unisom feed, and puller feed mechanisms. The document explains the basic workings of each type.
Warp knitting is a family of knitting methods in which the yarn zigzags along the length of the fabric, i.e., following adjacent columns ("wales") of knitting, rather than a single row ("course"). For comparison, knitting across the width of the fabric is called weft knitting.Warp knitting machines--needles are mounted collectively and rigidly in a horizontal metal bar (the needle bar that runs the full knitting width of the machine).
Hairiness is characterized by the quantity of freely moving fibre ends or fibre loops projecting from a yarn or textile fabric (woven, knitted or non woven fabrics).
In term of measurement Hairiness corresponds to the total length of the protruding fibres in unit length of one centimeter.
Warp knitting is a family of knitting methods in which the yarn zigzags along the length of the fabric, i.e., following adjacent columns ("wales") of knitting, rather than a single row ("course"). For comparison, knitting across the width of the fabric is called weft knitting.Warp knitting machines--needles are mounted collectively and rigidly in a horizontal metal bar (the needle bar that runs the full knitting width of the machine).
Hairiness is characterized by the quantity of freely moving fibre ends or fibre loops projecting from a yarn or textile fabric (woven, knitted or non woven fabrics).
In term of measurement Hairiness corresponds to the total length of the protruding fibres in unit length of one centimeter.
Spinning is the first steps of textile product processing. The process of making yarns from the textile fiber is called spinning. There are various types of spinning techniques for producing various types of yarn.
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1. Presented By
Md. Shamsuzzaman
B.Sc. (WUB), M.Sc. (BUTEX)
Lecturer,
Department of Textile Engineering
World University of Bangladesh
Contact: +880 1814 868653
Email: shamsuzzaman@textiles.wub.edu.bd
7/13/2020Slide Prepared by- Md. Shamsuzzaman
Feed Mechanism
Course Name: Apparel Engineering II
Course Code: TE 703
2. 1. Definition of feed mechanism
2. Functions of feed mechanism
3. Functions of teeth in feed dog
7/13/2020Slide Prepared by- Md. Shamsuzzaman 2
3. 7/13/2020Slide Prepared by- Md. Shamsuzzaman 3
Definition of Feed mechanisms
The process by which the fabric is moved
forward in the feeding zone of the sewing
machine
It refers to how the needles, bobbins,
loopers, auxiliary feed mechanism parts,
and the fabric being sewn itself moves
The only way for the needle to be able to
engage the next portion of the material
being stitched
Industrial machine may have single
option/combined option
4. 7/13/2020Slide Prepared by- Md. Shamsuzzaman 4
Functions of Feed Mechanisms
To advance the fabric in the feeding zone of the sewing machine
Proper seam appearance,
Proper stitching as required
Controlling of SPI ( Stitch per inch),
Sometimes crease effect is formed according to the design
Operation & to avoid different sewing faults
Appropriate feed mechanism is sleeted to confirm case in sewing
5. 7/13/2020
Slide Prepared by- Md. Shamsuzzaman
5
Different Parts of Sewing Machine Feed Mechanism
The following are the three parts of a sewing machine feed mechanism
Throat plate or needle plate Feed dog
Pressure foot
6. 7/13/2020Slide Prepared by- Md. Shamsuzzaman 6
Types of Feed Mechanism
1. Drop feed mechanism
2. Differential bottom feed mechanism
3. Adjustable top feed mechanism
4. Needle feed mechanism
5. Unisom feed mechanism
6. Puller feed m mechanism
7. 7/13/2020Slide Prepared by- Md. Shamsuzzaman 7
Drop feed mechanism
The simplest feed system of sewing of
sewing machine still commonest
While starting the machine feed dog
start from position 1 by holding the lower
part and moves towards the back of the
machine and drops fabric at position 2
Then slow down and comeback
oppositely (from 3 to 4)
Again holds the fabric ply and starts the
second cycle
• Most of the domestic and industrial purpose it is
suitable
• Distinction of the speed of lower fabric ply and
upper fabric ply may cause sewing faults
8. 7/13/2020Slide Prepared by- Md. Shamsuzzaman 8
Differential bottom feed mechanism
Modification of drop feed system and follow the same principle
The differential feed system contains two feed dog; one in front of the needle
and another behind the needle
The speed of individual feed dog can be controlled
When the speed of the front feed dog is higher than back, the fabric will store in
the position of both feed dog and will create pleat like effects during sewing
Extensively used for stretchy materials
When the speed of the back feed dog is
higher than front, the fabric will achieve
stretching and gathering effect
9. 7/13/2020Slide Prepared by- Md. Shamsuzzaman 9
Adjustable top feed mechanism
In this system, the presser foot works in two
section
One presser foot hold the fabric and another
moves the ply backward after sewing.
Both drop feed & differential bottom feed
mechanism can used here
Combination of adjustable feed & differential
bottom feed can make top ply gathering or
the gathering of bottom ply
10. 7/13/2020Slide Prepared by- Md. Shamsuzzaman 10
Needle feed mechanism
Then needle rise up & moves to form
the next stitch with one step advance
For the change of stitch length, setting
of bath needle & feed dog should be
changed.
Practically useful in bulky sewing
situation such as when quilting through
the fabric. wadding & for slapping
fabrics
Another name of needle feed mechanism is “Compound feed”
Needle itself moves forwards & backward
Needle penetrates the fabric enters into the note of the feed dog & for the
advance movement of 1 stitch length of fabric feed dog & needle pass the
same distance at the same time
11. 7/13/2020Slide Prepared by- Md. Shamsuzzaman 11
Unisom feed mechanism
The inside presser foot &
needle are driven at the same
time toward the same direction
No possibility of ply shifting
Suitable for sewing stitch fabric
& for bulk seam in heavy
weight materials
Normally used in special case
The presser foot has two independently driven section; the holding & the
feeding feet
This system is made by combination of needle feed & positive top & bottom
feed
In this system one presser foot is inside
the other presser foot & gives
movement at different times
12. 7/13/2020Slide Prepared by- Md. Shamsuzzaman 12
Puller feed mechanism
Useful in multi needle machine
specially for W/B making.
Modification of drop feed system where A pair of roller used
These rollers give a pulling motion on the fabric behind the presser foot
Top roller is generally driven by machine whitest the lower one moves
due to control & presser of the top roller
The surface speed of puller roller is slightly
higher then the feed dog speed to presser ply
shifting roping
13. 7/13/2020Slide Prepared by- Md. Shamsuzzaman 13
Types of feed dog teeth
Fine-toothed feed dogs with a pitch of
only 1.0–1.25 mm can be used to
prevent this
For sewing of light to medium weight
fabrics, a tooth pitch (distance from
peak to peak) of 1.3–1.6 mm is normal,
with the peaks slightly rounded off if
damage occurs on fine fabrics.
On heavyweight fabrics, a certain
amount of sagging is required for
satisfactory feeding in order to keep
both plies together. In this case, coarser
feed dogs of 2.5 mm tooth pitch may be
needed.
