JacquardThe 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) for maximum variety of sheds (without any heald shaft) for

beautiful and intricate ornamental large design fabrics.

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.

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.

� 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. 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.

Classification of jacquard1. Broadly classification:

.Ordinary

.Special

2. Source of power:2. Source of power:

.Hand

.Power ( Mechanical and Electrical)

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,…………………1800s s etc.etc.

5. Pitch of jaquard:

.Fine

.Medium

.Coarse.Coarse

6. Lift & No. of pattern

.SLSC

.DLSC

.DLDC

7. Position of Jaquard:

.Vertical

.Horizontal

8. System of Harness mounting8. System of Harness mounting

.London

.Norwich

9. Drive direction:

.Left hand

.Right hand

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