Dot line printer having ordinary low dot and high dot density pr

Details Dot line printer having ordinary low dot and high dot density pr Dot line printer having ordinary low dot and high dot density pr

1991-09-05

1994-03-08

Burr, Edgar S.

Printing

Selective or progressive

Bed and platen machines

400121, 400323, B41J 300

Patent

active

052918246

ABSTRACT:
A dot line printer provided with an ordinary dot density printing mode, a low dot density or draft printing mode and a high dot density printing mode. A hammer bank provided with a plurality of printing hammers is reciprocally movable in a shuttling direction for dot impressions when the hammer bank is moved through a printing region, and the moving direction of the hammer bank is reversed at a reversing region where a printing sheet is fed in a line to line direction. A shuttle cam is provided which is drivingly connected to the hammer bank. The shuttle cam has a cam profile capable of providing a cam lift characteristic approximately intermediate between a cam lift characteristics of the ordinary printing mode and that of the low dot density printing mode. A shuttling velocity of the hammer bank is changed in accordance with the selected printing mode and position of the hammer bank.

REFERENCES:
patent: 4819556 (1989-04-01), Abe et al.
patent: 5059047 (1991-11-01), Nakamura et al.

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