Novel full-automatic electric pencil sharpener

Abstract

The invention discloses a novel full-automatic electric pencil sharpener. The novel full-automatic electric pencil sharpener comprises an MCU (Microprogrammed Control Unit) main control unit, an H-bridge motor driving unit, a switch unit and a lithium battery charging management unit, wherein the H-bridge motor driving unit, the switch unit and the lithium battery charging management unit are electrically connected with the MCU main control unit, the lithium battery charging management unit is connected with a lithium battery, the H-bridge motor driving unit is connected with a motor in a pencil sharpening device, the MCU main control unit is connected with a motor current sampling unit which is used for sampling the current of the motor and matched with the MCU main control unit to control the motor to stop and / or rotate forwards and backwards, the motor current sampling unit is connected with the motor, the switch unit comprises a starting switch and a safety switch which are connected in series, and the starting switch is further connected with the MCU main control unit. According to the novel full-automatic electric pencil sharpener, the magnitude of the working current of themotor current changes differently under different load conditions and is evolved to be used for judging whether pencil sharpening is completed or not, so that a low-cost automatic detection function is realized.

Description

Technical field: [0001] The invention relates to the technical field of stationery products, in particular to a novel fully automatic electric pencil sharpener. Background technique: [0002] The electric pencil sharpener is a stationery that is driven by a motor and transmitted to the hob to cut the tip of the pencil. The hob has a certain inclination angle in the pencil sharpener, so that one end of the pencil can be cut to form a certain length and a taper. usable pencil tip. [0003] In the electric pencil sharpener in the prior art, an insertion opening for cutting pencils is usually arranged on the top cover, a hob is arranged under the cover, and a pencil cutting port is arranged on one side of the hob. After the pencil is inserted into the pencil sharpener, the motor is started, and the motor The hob is driven to rotate to cut the tip of the pencil, and the waste chips generated by cutting fall into the chip collection box, and an opening is arranged on the chip col...

AI Technical Summary

Problems solved by technology

[0004] The pencil sharpeners of the prior art only have a pencil sharpening function and an automatic stop cutting function, and do not have the function of automatically withdrawing the pen, so it is not convenient to use; the automatic stop cutting function of the current pencil sharpener is realized by a trigger switch, that is, the nib When the trigger switch is touched, the pencil sharpener will be triggered to stop cutting. There is a risk that the tip of the pen cannot touch the trigger switch, and the risk that the tip of the pen cannot touch the trigger switch is not convenient enough to use.

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