HAMMER ARRANGEMENT AND CONTROL FOR DOT BAND MATRIX PRINTER

摘要

The present arrangement is applicable to dot printers which comprise a continuously moving band (2) bearing dot font members (3) and a plurality of hammers (1) arranged to strike the band (2) at font member positions under the control of separate actuation mechanisms respectively by associated with the hammers. The hammers are associated by pairs, each pair covering a space equal to the spacing between adjacent font members. The odd and even hammers of each pair form two groups A and B. Controls are designed to assure that hammers in one group cannot be fired at the same time hammers in the other group are being fired. This greatly increases the clearance and makes possible setting the pitch of the front members to be exactly equal to twice the exposed individual hammer face width.