US 12,454,070 B2
Hair removal device
Christian Neyer, Eschborn (DE); Martin Fuellgrabe, Bad Camberg (DE); Johannes Weinkauff, Frankfurt am Main (DE); and Marvin Thorsten Knorr, Hochheim am Main (DE)
Assigned to Braun GMBH, Kronberg (DE)
Filed by Braun GmbH, Kronberg (DE)
Filed on Jul. 28, 2022, as Appl. No. 17/875,477.
Prior Publication US 2023/0034605 A1, Feb. 2, 2023
Int. Cl. B26B 19/38 (2006.01); A45D 26/00 (2006.01); G01R 25/00 (2006.01)
CPC B26B 19/388 (2013.01) [A45D 26/0042 (2013.01); G01R 25/00 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A hair removal device comprising an electric shaver or epilator, comprising a hair cutting unit, a motor for driving the hair cutting unit, a current and/or voltage measurement unit to measure motor current and/or induced voltage and an electronic control unit comprising a microprocessor and storage for storing software applications such that the electronic control unit is configured to define a cutting activity determinator to determine cutting activity during hair cutting from a signal of said measurement unit, and the electronic control unit further defines a wear determination unit to determine wear of the hair cutting unit from a cutting activity signal of said cutting activity determinator, wherein areas below the cutting activity signals of a plurality of hair removal treatments are determined, wherein a trend line indicative of a trend of said determined areas is determined and compared to a trend line threshold and/or a trend line threshold increase, and a wear signal is issued when said trend line reaches or exceeds the trend line threshold and/or a trend line increase reaches or exceeds the trend line increase threshold.