Let us know more about draw wire encoder.！

The basic operating principle of a draw wire encoder is simple; a rotary encoder is coupled to a spring loaded-reel through the use of a mechanical coupling device, internal to the housing of the reel. A cable is wound around the reel, usually a metal braid type. The braided cable is anchored to the drum of the reel and wrapped many times around it. The opposite end of the cable passes through an exit port of the draw wire encoder housing and is terminated with an anchoring device such as a clevis or loop to attach to the moving mechanism being measured. As the cable is pulled, the drum is rotated and the linear motion is translated into rotary motion, at which point the draw wire encoder encodes the information into an electric signal. In simplistic terms, the concept of a draw wire encoder can be likened to a fishing reel.
However, unlike the fishing reel analogy the drum is spring loaded to eliminate cable slack and therefore ensure accurate length measurement. Depending upon the linear distance being measured and the diameter of the draw wire encoder drum and cable, the absolute encoder must be of multi-turn encoder type in order to provide a true absolute measurement over the entire range of the linear motion. Draw wire encoder measurement lengths can range from a few inches to tens of feet.

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