Printer and motor having a balanced buck drive

Details Printer and motor having a balanced buck drive Printer and motor having a balanced buck drive

1996-09-11

1999-01-12

Yan, Ren

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-feed mechanism

400903, 101 9315, B41J 1900

Patent

active

058577874

ABSTRACT:
A dot matrix printer and motor having hammers forming in part a hammerbank and a counterbalance mechanically linked to the hammerbank with a link to the position of the motor. The motor includes coils positively driven and then negatively driven after current in the coils has at least partially decayed. The current in the coils is allowed to decay further after negatively driving the coil. The motor coils are connected to an H bridge having transistors which can be formed in a full H bridge or half bridge. A controller switches the transistors to cause negative and positive flow through the H bridge for positive current flow from a reference level to an upper reference level, and a decay of current within the coils to an intermediate reference. The coils are then driven with a negative current from the intermediate reference level to a second intermediate reference level afterwhich the current within the coils decays to a lower or initial reference level.

REFERENCES:
patent: 3941051 (1976-03-01), Barrus et al.
patent: 4463300 (1984-07-01), Mayne et al.
patent: 4498793 (1985-02-01), Barrus et al.
patent: 4749294 (1988-06-01), Barrus et al.
patent: 4854756 (1989-08-01), McCrimmon, Jr. et al.

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