Failure detection circuit for impact printers or the like

Details Failure detection circuit for impact printers or the like Failure detection circuit for impact printers or the like

1980-05-20

1983-09-20

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340644, H04Q 500, G08B 2100

Patent

active

044059221

ABSTRACT:
In an impact printer or the like having a plurality of print-hammer drive electromagnets which are respectively connected in series with switching transistors between the terminals of a voltage source, the switching transistors are normally gated into conduction by gating signals with a duration sufficient to energize the electromagnets for operating the associated print hammers. In a test mode which occurs prior to the operation of the printer, the gating signals are successively applied to the switching transistors and the duration of each gating signal is reduced so that the gated transistor remains conductive for a short interval which is insufficient to operate the hammer. The potential at a circuit junction between the respective transistor and the associated electromagnet is coupled through a voltage divider to an input of a coincidence gate which receives its another signal from the gate electrode of the associated transistor to generate a failure indication signal when the input logic states have a predetermined relation therebetween.

REFERENCES:
patent: 3571800 (1971-03-01), Taylor et al.
patent: 3835466 (1974-09-01), Bieszczad et al.
patent: 4205307 (1980-05-01), Liermann et al.
patent: 4263580 (1981-04-01), Sato et al.

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