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Computers in the factory

Recently, The company I work for was peripherally involved in the
de-commissioning of a cardboard corrugator (produced continuous sheet
about 10ft wide).

The machine had been running since the mid 1970s and was an unholy
mixture of 74' logic, discrete transistor and DTL logic, with a big
helping of relays and contactors thrown in for good measure.

The main 'computer' was three paxolin PCBs about 2ft wide and a total of
around 8ft high.

Sensors were a mixture of micro switches (not so micro) and hand
assembled photocells, consisting of mes lamp & lens structure for the
emitter pointing at another lens focused on a photodiode. None of your
modern anti-interference self adjusting stuff!

The bit I was saddest to see broken up was an almost unbelievable
variable reluctance drive for the huge DC main motor. There are
probably only a handful of engineers in the country these days that
are old enough to understand these beasts.

Apart from replaced lamps, PSU capacitors & rectifier diodes, there was
no evidence of any work having been done on this system.

--
Will J G

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