Control device for a matrix printer

Typewriting machines – Typing by other than type-face or type-die – Character formation by impact

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Details

400279, 400322, B41J 0225

Patent

active

053121937

ABSTRACT:
A control device for a matrix printer in which the mechanical printing elements of the matrix printer are selectively triggered by the control device a certain time before they reach the desired printing spot on the information carrier in order to compensate for the fact that the printing head will move further over a certain distance between the triggering moment and the moment that the printing element actually hits the information carrier. This distance depends on the speed of the printing element. If the print signal, however, is always generated a constant distance before the printing element reaches the desired printing spot, this signal must be delayed as a function of the speed of the printing element if the printing head is to print accurately also during its run-up and slow-down. To this end, a delay device is provided which delays the print signal for the relevant printing element by a time interval which depends on the printing head speed. A preferred embodiment of the delay device uses a counter, which is also used for determining the energizing time of the magnet and an interval time. Furthermore a correction device for determining the delay time in dependence on the speed is provided. This device works with two adjustable counters, in which one counter counts a constant pulse frequency and the other counter counts position pulses which depend on the movement of the printing element. The constant needle stroke time thus is converted into a speed-dependent path by which the lead distance of the print signal is corrected.

REFERENCES:
patent: 4010835 (1977-03-01), Martin
patent: 4189246 (1980-02-01), Kane
patent: 4389935 (1983-06-01), Arai
patent: 4407193 (1983-10-01), Hall
patent: 4421431 (1983-12-01), Dorrfub et al.
patent: 4487515 (1984-12-01), Harris
patent: 4757462 (1988-07-01), Sato

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