Measurement of displacement and speed in an injection molding ma

Details Measurement of displacement and speed in an injection molding ma Measurement of displacement and speed in an injection molding ma

1998-01-09

2000-01-18

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed analog electrical signal generator

324166, 324175, 264 401, G01P 352, G01P 1300, B29C 4576

Patent

active

06016056&

ABSTRACT:
A device for detecting motion of a movable part of an injection-molding machine uses an encoder coupled to the part which outputs two square waves which are a quarter-cycle out of phase. The two waves are used to generate trigger pulses at four times either encoder waves' frequency. The direction of the phase shift, positive or negative, depends on the forward or backward direction of motion of the part, and the trigger pulses are generated in on one of two logic circuits depending on the direction of motion of the part. The quadrupling of the encoder wave frequency increases the accuracy of motion measurement. The device uses AND/OR logic to generate the two sets of trigger pulses. The trigger pulses are counted to determine the distance the part has moved. The trigger pulses are also latched, and higher-frequency clock pulses are counted during the latched period to calculate the part's speed.

REFERENCES:
patent: 4811254 (1989-03-01), Iijima et al.

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