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Finger and hand protection on circular table and panel saws

  • Several hundred accidents involving the use of circular saws and resulting in injury, to hands or fingers occur each year in Germany. In the presented project, new approaches for the prevention of hand injuries and for the contactless detection of fingers are being investigated for comprehensive protection on circular saws. The basic principles can be applied to other machines with manual loading and/or unloading. This paper describes several principles to distinct human skin and wood and a safety guard that prevents touching the rotating blade. In a first approach a reliable protective device with functional diversity has been developed using a passive infrared sensor in combination with a capacitive field sensor. Second the distinction between skin and wood or other material is done by dedicated kind of spectral analysis in the near infrared region. With a kind of light curtain the intrusion into the dangerous zone near the blade can be prevented. The safety guard protects the operator’s hand within 50 ms. The forces of the protective system peak at no more than 120 N. We are presenting a complete strategy for such different tasks as cutting wedges, stopped cutting and hidden cutting, which have a very high odds ratio.

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Document Type:Article
Author:Dietmar Reinert, Oliver Schwaneberg, Norbert Jung, Sven Ullmann, Wilfried Olbert, Dieter Kamin, Rudolf Kohler
Parent Title (English):Safety Science
First Page:1175
Last Page:1184
Date of first publication:2009/02/23
Tag:Circular saws; Hand injuries; Light curtain; Protective system; Safety guard
Departments, institutes and facilities:Fachbereich Informatik
Institut für Sicherheitsforschung (ISF)
Dewey Decimal Classification (DDC):0 Informatik, Informationswissenschaft, allgemeine Werke / 00 Informatik, Wissen, Systeme / 004 Datenverarbeitung; Informatik
Entry in this database:2015/04/02