2. Jacquard
The jacquard is a shedding device attached to the top of
the hand loom or a power loom and controls a large
number of warp threads with a view to produce the
maximum variety of sheds (without any heald shaft) formaximum variety of sheds (without any heald shaft) for
beautiful and intricate ornamental large design fabrics.
3. 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.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 100-1800 yarns at any instant.
4. Differences between Jacquard shedding, Dobby
shedding and Tappet shedding:
Jacquard shedding
Dobby shedding
Tappet shedding
1. Most complex mechanism.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.
5. 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. 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. 6. Harness cord used.
6. Heald shaft used.
6. Heald shaft used.
7. Less production.7. Less production.
7. Less production.
7. Production is more than dobby shedding.
7. Classification of jacquard
1. Broadly classification:
.Ordinary
.Special
2. Source of power:2. Source of power:
.Hand
.Power ( Mechanical and Electrical)
8. 3. Type of shade:
.Bottom close shed
.Centre close shed
.Semi open shed.Semi open shed
.Open shed
4. Figuring capacity:
100ss, 200ss, 300ss ,…………………18,…………………1800ss etc.etc.
9. 5. Pitch of jaquard:
.Fine
.Medium
.Coarse.Coarse
6. Lift & No. of pattern
.SLSC
.DLSC
.DLDC
10. 7. Position of Jaquard:
.Vertical
.Horizontal
8. System of Harness mounting8. System of Harness mounting
.London
.Norwich
9. Drive direction:
.Left hand
.Right hand
11. 10. Method of harness mounting:
.Single tie-up
.Repeating tie-up
.Mixed tie-up.Mixed tie-up
.Pointed tie-up
11. Combination:
.Jacquard with tappet
.Jacquard with Dobby
.Jacquard with tappet and Dobby
