2. Presented by
Subrata Kumar Sarker
ID: 151014002
Department of Textile Engineering
Venue: GUB Date: 20 APRIL, 2017
3. My Presentation topic Is
Jacquard shedding
(Single lift single cylinder)
Venue: GUB, Date: 20 April, 2017
4. Jacquard :
Jacquard is a shedding device
placed on the top of the loom
to produce large figure
patterns by controlling a very
large no. of warp threads
separately by means of
harness cords, hooks and
needles.
It was invented by Joseph Marie Jacquard
Venue: GUB, Date: 20 April, 2017
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: GUB, Date: 20 April, 2017
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: GUB, Date: 20 April, 2017
7. Single lift Jacquard (Construction)
Single Lift Single Cylinder Jacquard is the
original and the simplest type of jacquard.
It works on bottom closed shed type of shedding
mechanism.
Here one set of knife with griffe controlled the
hooks. The hooks are controlled by needles of
one cranked eye and every needle is selected
one hook in that pick.
One neck cord with harness cord is controlled by
this mechanism
Venue: GUB, Date: 20 April,2017
8. Different Parts
a) Hook
b) Knife
c) Needle
d) Needle board
e) Pattern cylinder
f) Pattern chain
g) Spring box
h) Grid bar
i) Neck cord
j) Tug board
k) Harness Cord
l) Comber board
m) Heald wire
n) Dead weight
Venue: GUB, Date: 20 April,2017
9. 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: GUB, Date: 20 April, 2017
10. Advantage & Disadvantage :
Advantage :
• Tremendous design possibilities,
• Simpler in principle than dobby's.
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: GUB, Date: 20 April,2017
11. 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: GUB, Date :20 April, 2017
12. Thank you for your Attention
Venue: GUB, Date: 20 April, 2017
