Variohm Eurosensor - PRODUCT NEWS
Image: Wachendorffs LMSMA length measuring system on roll winding machine
Roll feed length measurement: Wachendorff offer web length measurement solutions for length, position, and speed feedback
For many roll feed applications, determining the length of the web material is an important part of the machine process. This can be as simple as a requirement to measure the overall length of a web or, for instance, to precisely align multiple printed layers or synchronise a stamping operation on a section of the web material.
Wachendorffs LMS series length measurement systems combine its ruggedised industrial shaft encoders with an integrated measuring wheel that is friction driven by direct contact with any roll cylinder in a cantilevered arm arrangement, providing positional feedback with a linear resolution from 1 millimetre to 8 microns. Rather than source positional information from a servomotor- or motor/gearhead-mounted encoder, which would have some degree of lost motion or hysteresis related to the encoders proximity to the actual reference point, Wachendorffs LMS length measurement systems are directly located at or very close to the working point on the web to provide optimal accuracy. With full support in the UK from Variohm EuroSensor, Wachendorffs exclusive distribution partner, a wide range of custom matched length measurement systems are available that will allow the customers control system to source length, position, and speed information from incremental or absolute encoders through a wide choice of optional interfaces.
For all Wachendorff length measurement systems, the encoder and measurement wheel assembly is mounted on the spring-loaded arm which includes an integral adapter plate that facilitates direct mounting on the customers machine - or the system can be supplied with an application customised angle bracket. The contact pressure between the measuring wheel and the web material is completely adjustable thanks to a spring-loaded cantilevered arm design that includes a patented tooth grid mechanism, allowing simple and repeatable preload force adjustment in steps of 5 N. The assembly also compensates for uneven fluctuation in the measured web material whilst ensuring complete unbroken contact. Practically any type of web material can be accommodated with several measuring wheel surfaces available. As the length measurement system can be easily swung from its fixed position to a resting position by adjusting just one captive screw, setup and adjustment is made easy with minimal delay in material changeover and maintenance time.
Image: Wachendorffs LMSCA length measuring system with various measuring wheels
The LMSCA series is an ultra-compact length measuring system that includes Wachendorffs WDGP series, 36 mm diameter incremental encoders in a variety of mounting configurations for use with measuring wheel diameters typically from 145 to 200 mm. With a resolution up to 16,384 ppr, the LMSCA can achieve web length measurement down to 12.5 microns per pulse. The encoder delivers A, B, and N channels with inverted signals from a 4.75 to 32V DC supply, in TTL or HTL as well as a choice of CAN, J1939, SSI or RS485 outputs. An M12 connector makes installation straightforward. For larger systems, Wachendorffs LMSMA series typically include WDGI series 58 mm diameter incremental encoders for resolution to 25,000 ppr and 8 microns per pulse linear measurement - with measurement wheels from 200 to 500 mm diameter. For both product types, the encoders IP67 protection rating (IP65 at the shaft input) and high radial and axial force specification guarantees durability in any machine setting.
Image: Wachendorffs LMSMA length measuring system with 500 mm measuring wheel with an angle bracket supplied for convenient mounting
Whilst these are typical encoder configurations, any type of Wachendorff encoder technology may be fitted to the length measurement systems including absolute encoders. WDGA series absolute encoders feature the German sensor specialists patented EnDra® magnetic encoding principle based on a Hall-effect scanning technique that combines a single turn resolution of up to 16-bits and a multiturn capability to 43 bits. These absolute encoders offer the potential for sub-micron resolution length measurement systems when combined with suitable motion control systems. Wachendorffs absolute encoders include all the output options mentioned above as well as PROFINET, PROFIBUS, EtherCAT and a Universal-IP version.
Wachendorffs comprehensive range of incremental and absolute encoders, length measurement systems and other specialist measurement products are available with full support from Variohm EuroSensor. Variohm is a designer, manufacturer and sensor component distributor offering sales and application support across a comprehensive range of position, force, pressure, load, and temperature measurement technologies for demanding application solutions in industry, construction, agriculture, motorsports, research and more.
About Variohm EuroSensor
Variohm EuroSensor is a manufacturer, distributor and supply chain partner providing complete sales and application support across a comprehensive range of position, force, pressure, load, and temperature sensor technologies - for demanding measurement applications across industry, construction, agriculture, motorsports, research and more.
About Variohm Holdings
Comprising four closely linked operating divisions, staffed by highly experienced motion and sensor application specialists with extensive knowledge of international standards; Variohm Holdings combines its considerable design and manufacturing capability with best of brand products and components from leading global partners to provide engineered solutions that are seamlessly and cost effectively integrated for your application.
For more information, please contact:-
Williams' Barn, Tiffield Road, Towcester Northants NN12 6HP United Kingdom
Tel: +44(0) 1327 351004
Fax: +44(0) 1327 353564
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