Types of shedding mechanism in weaving

Three types of shedding motions (opening) are available for different type of fabrics. They are:

  • Tappet shedding
  • Dobby shedding
  • Jacquard shedding

What is Tappet Shedding in Textile Weaving?

Tappet shedding is a type of shedding mechanism used in textile weaving. It is a mechanical system that controls the raising and lowering of the warp threads to create the shed through which the weft yarn is passed during weaving.

In tappet shedding, a tappet shaft is used to control the movement of the harness frames that carry the warp threads. The tappet shaft has a series of raised and recessed portions, which correspond to the pattern of the weave being produced. As the tappet shaft rotates, the raised portions of the shaft come into contact with a lever on each harness frame, causing it to lift the corresponding set of warp threads.

The number and arrangement of tappets on the tappet shaft determine the pattern of the weave being produced. By changing the arrangement of the tappets, different patterns can be produced on the fabric being woven. Tappet shedding is commonly used in weaving machines for producing fabrics with simple designs and patterns, such as plain weaves, twills, and some basic satin weaves.

What is Dobby Shedding in Textile Weaving?

Dobby shedding is a type of shedding mechanism used in textile weaving. It is a more advanced form of shedding than tappet shedding, and it allows for more complex patterns to be produced on the fabric being woven.

The dobby shedding mechanism uses a dobby device that controls the movement of the harness frames to raise and lower the warp threads, creating the shed through which the weft yarn is passed. The dobby device consists of a series of lags and hooks that are used to select the warp threads that are lifted.

The dobby device is controlled by a chain that contains a series of pegs or hooks. The pegs or hooks control the movement of the lags and hooks in the dobby device, determining which harness frames are raised or lowered to create the shed for the weft yarn to pass through.

Dobby shedding allows for a wide range of complex patterns to be woven on the fabric, including intricate designs, motifs, and textures. The dobby shedding mechanism is commonly used in jacquard weaving machines, which are capable of producing highly detailed and complex patterns on the fabric.

What is Jacquard Shedding in Textile Weaving?

Jacquard shedding is a highly advanced form of shedding mechanism used in textile weaving to produce intricate and complex patterns on the fabric. It is named after Joseph Marie Jacquard, who invented the Jacquard loom in the early 19th century.

The Jacquard shedding mechanism uses a Jacquard machine that controls the movement of individual warp threads to create the shed through which the weft yarn is passed. The Jacquard machine contains a series of punched cards with holes in them, which are used to control the movement of the warp threads.

The punched cards are mounted on a rotating cylinder that passes over a series of hooks. Each hook corresponds to an individual warp thread. As the cylinder rotates, the hooks are raised or lowered depending on the pattern specified by the punched cards. This movement of the hooks causes the individual warp threads to be lifted or lowered to create the shed through which the weft yarn is passed.

The Jacquard shedding mechanism is capable of producing highly detailed and complex patterns on the fabric, including images, letters, and intricate designs. Jacquard weaving machines are commonly used in the production of high-end fabrics such as brocades, damasks, and tapestries.

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