Rotating grass trimmer

Abstract

The invention discloses a rotating grass trimmer which comprises a shell, a motor, a wire box, a length detection element, an electromagnet and a control element. A wire reel and a pay-off shifting fork are arranged in the wire box, a trimmer line is wound on the wire reel, one portion of the trimmer line penetrates the wire box and has a rated length outside the wire box, whether pay-off is performed or not is controlled according to the fact whether the penetrating portion of the trimmer line exceeds the rated length or not when the grass trimmer starts rotating, the length of the trimmer line is judged by detecting centrifugal force generated by the penetrating portion of the trimmer line in the whole process, pay-off control is realized by the electronic control element, gratuitous waste of the trimmer line can be decreased, and operation of a user can be greatly facilitated.

Description

technical field [0001] The invention relates to a rotary mower, in particular to a rotary mower capable of automatically controlling the length of a mowing rope. Background technique [0002] Most of the mowers in the prior art are rotary mowers. Specifically, the wire box is driven by a motor to rotate, and the wire box is connected with a flexible mowing rope. Different types of grass are cut and treated. However, due to the constant rubbing of the work, the consumption of the grass rope is very fast. After the grass rope is consumed, it is generally manually pulled out more grass rope from the wire box. Grass rope is obviously time-consuming and labor-intensive, so there is an urgent need for a technology that can automatically pay off the mower in the power tool industry. [0003] In the utility model patent whose application number is 201220038260.4, a new type of rotary lawnmower is disclosed, which can realize automatic wire setting. The principle is: wind the mowin...

AI Technical Summary

Problems solved by technology

But this can't really solve the problem of "on-demand" release of the mowing rope: sometimes even if the length of the mowing rope is enough, as the mower is turned on and off, an extra section of mowing rope will inevitably be released, resulting in It saves unnecessary waste; and sometimes it is necessary to release more mowing ropes, but the length released each time the machine is turned on and off is not enough, the user can only turn on and off the machine several times to make the total length released meet the requirements

Whether it is from the perspective of saving or convenient use, there are certain problems in this technical solution

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