Microprocessor controlled SCR motor drives for wrapping machine

Package making – With means responsive to a sensed condition – Concurrent control of contents and receptacle feeds

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533894, 53550, B65B 906, B65B 5700

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active

051388154

ABSTRACT:
A microprocessor controlled wrapping machine including a separate SCR drive driving a corresponding permanent magnet motor, wherein an incremental optical encoder is coupled with each permanent magnet motor to provide a feedback signal indicative of motor position to a microprocessor. Both a main motor, which drives the infeed conveyor and the cutting head assembly, and a finwheel motor are used in combination with the SCR drive and an incremental optical encoder to provide a low cost alternative to a servo amplifier-controlled motor drive. Both the finwheel motor and the main motor are independently controlled from one another as a function of an oscillator, which forms a portion of the microprocessor circuit, and as a function of input switches and the respective feedback signal provided by the respective incremental optical encoder. The present invention provides a low cost alternative to wrapping machines incorporating expensive servo amplifier-controleld motor drives. Using an incremental optical encoder, the associated motor speed can be precisely controlled.

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patent: 4807420 (1989-02-01), Barker
patent: 4909018 (1990-03-01), Yamamoto
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