Loom Brake System | Types of Loom Brake | Band Brake of Loom

Loom Brake System:

Brake: A brake is a device by means of which artificial frictional resistance is applied to moving body in order to stop the motion of a loom.

Electric loom brake:
The friction brake permits a fine adjustment on the warp tension. It is particularly appreciated on a fine mate-rial and on fibers without elasticity such as linen and cotton. It has a flat wire band, called a wire brake circle, wound 3 times around a metal drum which is attached to the end of the warp beam. One end (the one close to the frame) is attached directly to the loom. The other end is attached to a coil spring which pulls it straight down. The greater the pulling power applied to the wire brake circle the stronger the brake action.
Loom Brake
Fig: Loom Brake
Types of Brake:
Through there are many types of brakes, the following are commonly used in looms:

  1. Shoe brake
  2. Band brake 
1. Shoe brake:
Shoe or block brake. In a shoe brake the rotating drum is brought in contact with the shoe by suitable force. The contacting surface of the shoe is coated with friction material. Different types of shoe brakes are used, viz., single shoe brake, double shoe brake, internal expanding brake, external expanding brake.

2. Band Brake:
The brake stops the loom immediately whenever required. The weaver uses it to stop the loom to repair broken ends and picks.

A band brake consists of a flexible band of leather, or steel lined with friction material, which embraces a part of the circumference of the dram shown in figure. One end is fixed at the point and other is fixed with a spring loaded collar. When force is applied to the lever hence the brake is applied. The friction between the band on the drum and the drum provides the braking force as lateral movement of leaver creates a pressure on the brake band.

Why brake slip?
Brake can slip for the following reasons.

  1. The installation is wrong.
  2. The brake drum is too smooth.
  3. The wire circle is in bad condition (coils have to go around side by side).
  4. The spring coil is too old and has lost power. 
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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