IMG 0069 Edited

Pioneering sensor technology in textile innovation

Loepfe has redefined the landscape in textile manufacturing through cutting-edge sensor technology. For decades, Loepfe has been at the forefront of revolutionizing the textile industry, elevating the standards of quality and precision.

Loepfe's sensors are designed to deliver unparalleled accuracy in detecting even the slightest imperfections in yarns before they are processed into a fabric. The range of innovation extends to yarn clearers, weft stop motions, and electronic tensioners.

But for Loepfe, it does not end with sensor technology. Finding and shaping sensor solutions means offering products, parts, services, and technologies to customers as part of a broader system. Through a diligent exploration of needs and application pain points, a deep understanding of markets delivers best-in-class and clever textile quality control systems.

And a clever textile quality control system makes a spinning mill profitable and efficient, and ultimately, makes everyday work for operators easier in spinning mills.


Advanced optical sensor technology

At the heart of Loepfe's yarn clearers lies advanced optical sensor technology. These sensors are designed to meticulously scan the yarn as it is being produced. They can detect a wide range of imperfections, such as knots, slubs, foreign fibers, thin and thick spots, and even color variations. The precision and sensitivity of these sensors are remarkable, allowing for the detection of defects that might escape the naked eye.

These sensors continuously monitor and analyse the fabric's composition, ensuring that the final product meets the highest quality standards.

This level of precision allows manufacturers to make immediate adjustments, reducing waste and enhancing productivity. With Loepfe's sensors, textile producers can now maintain consistent quality throughout the entire production process, from raw materials to the final product.

625 G0050 01 029

Sustainability through efficiency

As the textile industry grapples with sustainability challenges, Loepfe's sensor technology offers a solution. By minimizing defects and optimizing production, these sensors contribute to reducing material waste and energy consumption. This not only benefits the environment but also the textile manufacturers.

We want you to perform

Global impact and innovation

Loepfe's commitment to innovation extends far beyond the confines of a single factory or region. These sensors are used by textile manufacturers around the globe, enabling the production of fabrics that meet the demands of a rapidly changing market. From fashion to automotive textiles, Loepfe's sensors are the bedrock of quality and innovation.

Loepfe portfolio

Loepfe has established itself in the field of optical yarn clearers with pioneering achievements.

Today, Loepfe is considered worldwide as the specialist for integral quality control systems. Fifty percent of the worldwide staple fiber yarn production is monitored by Loepfe yarn clearers.


  • YarnMaster PRISMA Yarn quality control for winding
  • YarnMaster ZENIT+ Yarn quality control for winding
  • YarnMaster EOS Yarn quality control for rotor yarn clearing
  • YarnMaster 3N1 Yarn quality control for rotor yarn clearing
  • MillMaster TOP Real-time data monitoring for winding


  • WeftMaster FALCON-I Yarn defects control during fabric manufacturing process
  • WeftMaster FWL Yarn Stop Motion
  • WeftMaster KW Knot detector in running yarn
  • WeftMaster SFB Weft thread brake for controlled weft tension
  • WeftMaster SW Weft stop motion for highly sensitive applications
  • WeftMaster CUT-iT Thermal fabric separation on weaving machines

About Loepfe

Since its establishment in 1955 by the brothers Helmut and Erich Loepfe, the company has been the pace­setter for innovation in textile quality control. Loepfe has established itself in the field of optical yarn clearers with pioneering achievements. Today, Loepfe is considered world-wide as the specialist for integral quality control systems. Fifty percent of the world-wide staple yarn production are monitored by Loepfe yarn clearers.

The headquarter is in Wetzikon/Switzerland where Loepfe employs approximately 150 employees. The pro­duction location Switzerland guarantees stability and reliability. All Loepfe products are developed and manufactured in Switzerland. Loepfe is represented in all important textile markets by an international network of representations and service locations.

Loepfe quality is based on our employees‘ unique know-how and many years of experience. They do outstan­ding work. Loepfe invests systematically in research and development. We know the complex requirements of the textile industry and provide tailor-made solutions, state-of-the-art technology. We keep an eye on the future and already work on tomorrow‘s solutions today.

Built for expert solutions partnerships at the top level

A good portion of Loepfe´s business is directly with machine manufacturers in Europe and the Far East. Working together hand in hand with the manufacturers increases the effectivity in quality assurance from year to year. In addition to many excellent partnerships in the textile industry itself, partnerships exist with the following OEM customers.

Winding machine manufacturers

Savio web
Rifa web

Weaving machine manufacturers

Jaeger web
Jakob mueller
Rifa web
Customer survey

Customer satisfaction

Thank you for your contribution
Your comments and feedback will be greatly appreciated - please take the time to fill out the enclosed questionnaire.

Your feedback


  1. FIRST yarn clearer with dual measurement

    YarnMaster® PRISMA - A WORLD FIRST

    • DM-Sensor (Dual Measurement)
    • RGB F-Sensor
    • P4-Sensor 4rd Generation
    History prisma
  2. PIONEER in the detection of polypropylene

    YarnMaster® ZENIT

    • First Polypropylene simultanous dark/bright foreign matter
    • First Touch Screen
    • LED Information Interface on Sensing Head
    History zenit
  3. PIONEER in the detection of hairiness

    YarnMaster® SPECTRA

    • LabPack
      - online IPI
      - online SFI and SFI/D
    History spectra
  4. PIONEER in the detection of foreign matters

    YarnMaster® 800/900

    • First Foreign matter detection.
    • First online Classification.
    • MillMaster - Centralized
    History ym800
  5. FIRST electronic weft brake for projectile looms

    WeftMaster® SFB

    Automatic weft thread brake
    for projectile and
    rapier weaving machines

    History sfb
  6. FIRST Loepfe yarn clearer

    WeftMaster® FR1

    • Length
    • Diameter
    History fr2
  7. FIRST electronic weft monitoring in the textile industry

    WeftMaster® LF

    Opto-electronic bobbin feeler
    for shuttle weaving machines

    History lf2