B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
101/96.09
B41J 9/10 (2006.01)
Patent
CA 1179891
RA981016 MULTIPLEXED HAMMER DOT BAND MATRIX PRINTER Abstract The present invention describes a dot band matrix printer in which the pitch of the dot font elements on the moving band is precisely twice that of the pitch between hammer faces. A hammer bank is positioned for impacting the dot font elements and driving them into a printing medium. The pitch between two dot font elements is normally assigned to a single hammer, but in the present invention, the number of hammers is doubled. Also an electronic control is used so that adjacent hammers cannot be fired simultaneously. The hammers are divided into two groups with members of each group alternating on a one for one basis along the hammer bank. Control circuits are utilized to prevent one of the groups of hammers so defined from firing at the time the other group is being fired. The result is that the hammers which are fired will all be operating on the same relative dot position in their space in the line of print being formed. With normal dot band hammers, additional spacing is allowed between dots on the band to avoid the problem of nipping and crashing of the anvil elements on RA981016 the back of the dot band into extended faces of adjacent print hammers. This has created a small gap in which no dots can be created. The present invention also provides a means for automatically selecting large or small dots for printing if the print band has large and small size dot font ele- ments alternated serially on it. It is only neces- sary to choose firing the hammers of the first group or the second group first in order to select large dots or small dots for printing.
414898
International Business Machines Corporation
Kerr Alexander
LandOfFree
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