SPEED CHANGING DEVICE FOR MEDICAL SCANNING AND RECORDING

The utility model relates to a medical speed changing device for scanning and recording which can provide the scanning and recording device with a plurality of scanning and recording speed. It is suitable for eye electrically compact graphical, optomotor character objective inspection on eyesight and other bioelectricity tracings, especial low speed scanning and recording. It is composed of eight elementary gear wheels and gears which are various in size. Just replacing a couple of intermeshing gear wheels, we can obtain different scanning and recording speed. The frame of former instrument doesn't need alerting if adopting the instrument, and the utility model has the advantages of convenient replacement, simple structure and broad speed range. Any scanning and recording speed is available in clinical and medicine study and the utility model provides a speed changing instrument which can be matched with the speed changing instrument being used in medical treatment.