Dual pitch impact printer

Details Dual pitch impact printer Dual pitch impact printer

1986-10-22

1988-07-26

Pieprz, William

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Imprint by movement of record-medium against type-face

101 9348, 101 9309, 101 9314, 400 82, 400303, 400146, B41J 912

Patent

active

047596473

ABSTRACT:
A printer for printing both standard pitch and condensed pitch characters which includes print hammer faces which have a single wide section for standard pitch characters and a double wide section for printing condensed pitch characters. Using this hammer face one obtains the advantage of high speed when printing standard pitch characters and yet one is able to print condensed pitch characters with the same printer.
The face of each hammer is divided into two sections. The first section of each hammer face is identical to the hammer face in a conventional single width hammer. The second section of each hammer face spans the width of two condensed pitch characters.
The hammers are divided into two groups. The first group of hammers has the single width section on the top of the hammer face and the second group of hammers has the single width section on the bottom of the hammer face. Hammers in the first and second groups alternate along the print line and the hammers are aligned so that single width section of all the hammer faces are in a straight line.

REFERENCES:
patent: 3715978 (1973-02-01), Raider
patent: 4150619 (1979-04-01), Hasler
patent: 4399748 (1983-08-01), Thorne
"Dual Density Printing", IBM Tech. Disclosure Bulletin, vol. 29, No. 4, pp. 1752-1753, 9-86.
Gamblin, "Sharing Print Hammer . . . ", IBM Tech. Disclosure Bulletin, vol. 13, No. 7, pp. 1833-1834, 12-70.
"Mini Printing Line Printer", IBM Tech. Disclosure Bulletin, vol. 29, No. 3, pp. 1049-1051, 8-86.
Martin et al., "Control of Printers . . . ", IBM Tech. Disclosure Bulletin, vol. 18, No. 1, pp. 89-90, 6-75.

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