Download - Jacquard loom
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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.
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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.
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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.
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� 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.
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� 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.
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Classification of jacquard1. Broadly classification:
.Ordinary
.Special
2. Source of power:2. Source of power:
.Hand
.Power ( Mechanical and Electrical)
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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.
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5. Pitch of jaquard:
.Fine
.Medium
.Coarse.Coarse
6. Lift & No. of pattern
.SLSC
.DLSC
.DLDC
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7. Position of Jaquard:
.Vertical
.Horizontal
8. System of Harness mounting8. System of Harness mounting
.London
.Norwich
9. Drive direction:
.Left hand
.Right hand
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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
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