Patent ID: 9233460
Filing Date: 2016-01-12
CPC Classification: B25F

Claim Text:
1. An electric hand power tool, comprising: a cylindrical device section, a control element which is movable around the circumference of the cylindrical device section, and an electric scanning apparatus which is arranged on the cylindrical device section and is configured to determine a rotary position of the control element, wherein the scanning apparatus is further configured to optically scan the rotary position, wherein; the control element including a first plurality of position markings along a first circular arc at a first radius and a second plurality of position markings along a second circular arc at a second radius different from said first radius, and the scanning apparatus includes a first number of scanning elements configured to scan position markings on said first circular arc and a different second number of scanning elements configured to scan position markings on said second circular arc, said scanning apparatus configured to determine the rotary position based on signals from the first and second number of scanning elements.