This presentation summarizes the Jacquard shedding mechanism. It introduces the four presenters and provides background on the Jacquard loom, which can produce complex woven designs through individual control of warp threads. The presentation then covers the scope of Jacquard shedding, including its ability to control thousands of yarns and produce intricate designs. It also classifies different types of Jacquard looms based on their lifting capacity, design capacity, shed formation, and other features. Key aspects of the single lift Jacquard mechanism are explained. Advantages and disadvantages of the Jacquard loom conclude the presentation.

1. Presentation on
Jacquard shedding mechanism
Presented By :
Venue: NUB, Date : November 24, 2016
Name ID
1) MD. Maynoul Hossain BTX-150100370
2) Sihab Uddin BTX-15000372
3) Shekh Sahriaz Kaiser BTX-150100375
4) Muhammad Nafiz Reza BTX-150100377

2. Welcome To Our Presentation
Venue: NUB, Date : November 24, 2016

3. Jacquard loom :
Jacquard loom is a
mechanical loom that
produces elaborate
design in an complex
weave.
It was invented by Joseph Marie Jacquard
Venue: NUB, Date : November 24, 2016

4. Scope of Jacquard Shedding:
• It can be used for a large design which cannot be positive on tappet or dobby. It can
produce most complex or any design.
• It can produce any shape of design.
• One warp thread for each harness.
• Most costly fabric is produced. (Costing: Jacquard>Dobby>Tappet).
• No heald shaft is used.
• Every thread is controlled individually.
• It is possible to lift 2000-3000 yarns at any instant.
– A dobby shedding cannot be used suitably for producing beautiful and intricate
(Complex) ornamental designs in forms and colors, in which a large number of
warp threads are required to be controlled individually and in such case a
jacquard shedding is used.
– Jacquard shedding is however, an extensive form of weaving – as it is
accompanied with designing, card cutting, lacing and all other jobs associated
with.
– Speed : Jacquard<Dobby and Tappet.
Venue: NUB, Date : November 24, 2016

5. Classification of jacquard :
1. Broadly:
(a) Ordinary jacquard
(b) Special jacquard
2. According to lift and no. of pattern cylinder:
(a) Single lift single cylinder jacquard
(b) Double lift single cylinder jacquard
(c) Double lift double cylinder jacquard
3. According to figuring capacity:
100’s, 200’s, 300’s (100’s………………………..1800’s +)
Venue: NUB, Date : November 24, 2016

6. Classification of jacquard :
3. According to type of shed :
(a) Bottom close shed jacquard
(b) Centre close shed jacquard
(c) Semi-open shed jacquard
(d) Open shed jacquard
4. According to pitch of jacquard :
(a) Fine pitch jacquard
(b) Medium pitch jacquard
(c) Coarse pitch jacquard
5. According to position of jacquard :
(a) Vertical
(b) Horizontal
Venue: NUB, Date : November 24, 2016

7. Single lift Jacquard :
• The single lift jacquard , the shed is formed by raising the hooks by
the knives (i.e. the bottom shed is stationary).
• It form s a bottom-close shed
• There is therefore much wasted movement, together with a
tendency for the hole harness to swing. The cylinder must
reciprocate and turn, and the griffe must rise and fall every pick.
• This requires more time to from the shed .these considerations
drastically limit the speed at which the loom can be run.
• Additionally, the lifted warp ends are highly strained and this may
cause end breakage .
Venue: NUB, Date : November 24, 2016

8. Single lift single cylinder center
shed Jacquard Mechanism :
During the cycle of operation one of the faces of the
cylinder together with a card is brought against the
needle board. If a hole is punched in the card the
corresponding needle will project through in the
cylinder. the hook controlled by that needle will
remain is such a position that its upper hooked end
un punched will be caught by the raising knife. The
un punched position of the card will press back the
needle & consequently the hook controlled by that
will be away from the path of the using knife. Thus
the hook gets selection according to the design cut
for a particular card.
When the hooks are lifted by the knives the cylinder
moves out a limited distance. A catch holds it
against the top corner of the cylinder. The cylinder is
turned about its axis & new card is presented to the
needles during its next cycle.
By this time the griffe along with its knives descend
to lower the warp threads to the bottom shed line for
a fresh warp threads to the bottom shed line for a
fresh selection of the hook at the next pick.
Venue: NUB, Date : November 24, 2016

9. Advantage & Disadvantage :
Advantage :
• Tremendous design possibilities,
• Simpler in principle than dobbies.
Disadvantage :
• Large scale moving parts makes the machine and its harness relatively costly to install and
maintain.
• Jacquard fabrics are much more costly to produce.
• Jacquard machines are even more liable to produce faults in the fabric than dobbies.
• Pattern change is a time consuming process.
• Until recently, the jacquard machine had tended to impose limitations (300 picks/min )
• Jacquard shedding is normally used only when the cloths to be woven are outside the scope of
dobby shedding.
Venue: NUB, Date : November 24, 2016

10. Differences between Jacquard shedding, Dobby
shedding and Tappet shedding:
Jacquard shedding Dobby shedding Tappet shedding
1. Most complex
mechanism.
1. Quite complex
mechanism.
1. Simple mechanism.
2. Installation cost is
high.
2. Installation cost is
medium.
2. Installation cost is low.
3. 2-1000 yarns can be
controlled collectively.
3. 2-36 yarns can be
controlled collectively.
3. 2-8 yarns can be
controlled collectively.
4. Jacquard is placed
generally above the
loom.
4. Dobby is placed
generally above the
loom
4. Tappet is placed
generally below the
loom.
5. It can produce any
shape of design.
5. It can produce square
and rectangular design
5. In can produce basic
design.
6. Harness cord used. 6. Heald shaft used. 6. Heald shaft used.
7. Less production. 7. Less production. 7. Production is more
than dobby shedding.
Venue: NUB, Date : November 24, 2016

11. References List :
• http://textilelearner.blogspot.com/2012/06/characteristics-of-
jacquard-mechanisms.html
• http://textileup.blogspot.com/2014/11/jacquard-weaving.html
• https://books.google.com.bd/books?id=SshI5QYlgKMC&pg=PA153
&lpg=PA153&dq=single+cylinder+jacquard+mechanism&source=bl
&ots=MtjtPL-
qhR&sig=nNFxlCkFc2efOuB6SnpmJIy3Nr8&hl=en&sa=X&redir_esc
=y
• https://archive.org/stream/jacquardmechanis00brad/jacquardmecha
nis00brad_djvu.txt
Venue: NUB, Date : November 24, 2016

12. Thank you for your Attention
Venue: NUB, Date : November 24, 2016