Hand-operated type multi-tooth-form drawing machine

Abstract

The invention provides a hand-operated type multi-tooth-form drawing machine including a worm shaft with two worms, the worm shaft synchronously drives two equal-size worm gears in separate paths, the two worm gears are respectively connected with two rotating shafts, the first rotating shaft is connected with a four-bar mechanism to perform a reciprocating motion, a space cam is arranged on the second rotating shaft, the space cam has a spiral groove structure, a cam driven pin is clamped in the groove and can move along the groove, the cam driven pin is connected with a rack cutter and racks, the racks are connected through gears and drive a tooth drawing disc to rotate, the four-bar mechanism is connected with and drives a pen carrying device, the pen carrying device includes an edge tooth head which is cooperatively contacted with the tooth form of the rack cutter, and the pen carrying device draws the tooth form under the limitation of the edge tooth head displacement while moving. The drawing machine is convenient to operate, can rapidly draw the tooth forms of the gears as required, and can increase students' interest and understanding in mechanical principles and gear generation method experiments.

Description

technical field [0001] The invention relates to the technical field of teaching experiment instruments, in particular to a hand-operated multi-tooth shape plotter used for gear fan-forming method experiments in mechanical teaching. Background technique [0002] At present, the instrument for doing the gear fanning method experiment is composed of a toothed plate, a gear, a rack and a rack cutter. The experimenter needs to move the rack intermittently for a short distance to drive the gear to rotate. During the time when the rack and pinion are stagnant, use a pencil to trace the trajectory of the tool over and over again along the shape of the tool on the paper on the drawing board. This process requires eyes to be fixed on the tip of the pen. , a number of trajectory envelopes form the shape of a gear, and the gear is depicted. Only two kinds of tooth shapes can be drawn on the paper (ie, standard tooth shape and shifted tooth shape), but to form an undercut tooth shape, i...

AI Technical Summary

Problems solved by technology

Moreover, the process of drawing teeth is cumbersome and long, and it is difficult to imagine the process of machining gears by Fan Chengfa, which reduces the experimenter's interest in the experiment and is not conducive to teaching

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