Electric cutting tool with automatic emergency stop

The invention concerns a safety cutting tool (10) comprising - an electrically conductive cutting member (12)， - an electric motor (20) for actuating the cutting member (12)， a gripping handle (30) for the cutting tool (10) to be gripped in the hand of a user， the gripping handle being electrically insulated from the cutting tool， - a cutting trigger control (28) that can be actuated by the hand of the user gripping the gripping handle， the cutting trigger control being electrically insulated from the cutting tool， - an emergency stop device (40) sensitive to a user coming into contact with the cutting member. According to the invention， the emergency stop device is controlled by a comparator comparing an impedance of a first electric circuit comprising the cutting tool and a second electric circuit used as a reference， the first and second circuits comprising manual contact electrodes provided on at least one of the gripping handle (30) of the tool and the cutting trigger control (28). The invention also concerns a method for controlling such a tool. The invention is applicable to electric secateurs and shears.

本发明涉及一种安全切割工具（10），其包含：导电切割构件（12）、用于驱动该切割构件（12）的电动机（20）、供用户手持握持的握持手柄（30），该握持手柄与切割工具之间实现电绝缘；切割扳机控制器（28），可由握持握持手柄的用户手部进行操作，该切割扳机控制器与切割工具之间同样电绝缘；以及应急停止装置（40），该装置可响应于用户接触切割构件而触发动作。根据本发明，该应急停止装置由比较器控制，该比较器对包含该切割工具的第一电路的阻抗与用作参考的第二电路的阻抗进行比对；第一与第二电路均设置有手动接触电极，该电极设于工具的握持手柄（30）与切割扳机控制器（28）中的至少一处。本发明同时还涉及一种用于控制此类工具的控制方法。本发明可应用于电动修枝剪及剪切工具。