Patent ID: 9742315
Date: 2017-08-22
CPC Classifications: A01D,A01G,B25F,H02P

Claim:
1. A handheld work apparatus comprising: a work tool; a gear mechanism; an electric motor configured to generate a rotational movement and to drive said work tool via said gear mechanism; said gear mechanism being configured to convert said rotational movement of said electric motor into an oscillating movement of said work tool; an electric circuit including said electric motor and a switch unit for operating said electric motor in a first rotational direction; said electric circuit further including a drive circuit for said electric motor; said drive circuit including a control unit configured for operating said electric motor in said first rotational direction or in a second rotational direction; a memory unit configured to store a value of a control variable; said control unit being further configured to autonomously determine a selected one of said rotational directions of said electric motor for a next operating cycle (B when said electric motor is started, said electric motor is started in the rotational direction corresponding to the actual value of said control variable stored in said memory unit and wherein the value of said control variable is autonomously newly determined for a follow-on operating cycle (B a first summing element configured to generate a first sum associated with said electric motor being operated in said first rotational direction and to output a first output signal; a second summing element configured to generate a second sum associated with said electric motor being operated in said second rotational direction and to output a second output signal; and, a comparator configured to compare said first output signal and said second output signal and to output a new value of said control variable.