encoder catalog - SickStegmann - #19

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SICK|STEGMANN • Ph: 800-811 -911 0 • www.stegmann.com 17 BTF/PRF Wire-Draw Encoders Wire draw encoders are linear-to-rotational, industrial motion conversion modules, coupled with encoder feedback, to provide cost-effective linear position measurement solutions that precisely fit your requirements. These systems are housed in rugged industrial enclosures, and contain a stainless steel or thermoplastic composite cable wound on a precise, constantdiameter spool. The cable is attached to the apparatus whose position is being measured, and is extended and retracted as the apparatus moves. A spring on the spool maintains cable tension. Position feedback is provided by a standard incremental or absolute rotary shaft encoder. These position transducers allow very flexible measuring paths, since the cable can be guided around obstacles using pulleys, etc. The heavy-duty enclosure of the encoder and spool housing provide excellent protection against contaminants, shock and other abuses. Length measuring systems by SICK|STEGMANN are flexible enough for almost any orientation or measuring path. BKS/PKS Wire-Draw Encoders In these compact wire draw encoders, the encoder is integrated into the wire draw mechanism to minimize the size of the unit. The number of drum rotations, which is proportional to the length being measured, is counted by an encoder and converted to a standard encoder output signal. This provides high-resolution position or distance information for linear measurement paths, even under difficult mounting conditions. Precise linear guidance, as required for other length measurement systems, is not necessary. The choice between absolute and incremental wire draw encoders manufactured by SICK|STEGMANN enables madeto- measure solutions for many applications: SSI interface for absolute wire draw encoders, TTL interface for incremental wire draw encoders. Both interfaces are common in automation technology and meet its exacting requirements. The measuring lengths up to 5 m cover most of the possible applications, for example in: Presses, punching and injection machines, storage technology, wood and sheet metal processing machines, construction machinery, medical technology and many other industries.