| 摘要 |
PURPOSE:To obtain the optimum number of revolution by measuring the length of a cut work by automatically measuring the incident-rays cutting-off time in the case when a work passes through a detection hole, by two photodiodes arranged in the vicinity of a cutter and controlling a motor for the cutter. CONSTITUTION:When a work 3 is cut by a fixed cutter 1 and a rotary cutter 2 revolved by a motor 10 and starts to slide on a slide 5, said work 3 closes the detection hole of a photodiode 8 and cuts-off incident rays. When the work 3 lowers further, the detection hole of the second photodiode 9 is closed, and the detection electric current becomes zero, and the passed time (t1) is measured, and the passing speed of the work is measured. When the work 4 drops further and completes the passing through the photodiode 8 and the detection hole, light is introduced again, and the photodiode 8 transmits a signal current, and the passed time (t2) is measured, and the length of the work 4 is measured, and said length is compared with a prescribed length in a comparison circuit, and the differential signal for the cut length is sent into a control circuit for the motor 10. |
