Printing head in a dot-line printer

Details Printing head in a dot-line printer Printing head in a dot-line printer

1992-03-23

1993-08-24

Wiecking, David A.

Printing

Selective or progressive

Bed and platen machines

400121, B41J 2515

Patent

active

052379183

ABSTRACT:
In a dot-line printer, a hammer bank carrying a plurality of dot printing hammers reciprocally moved along a printingline. Each of the printing hammers is made up of a leaf spring, one end of which is fixedly secured to the hammer bank and to another end of which a printing pin is attached. According to the invention, the plurality of dot printing hammers are separated into an odd-number group and an even-number group, in which the printing hammers in each of the odd-number and even-number groups are further separated into a predetermined number of sub-groups. The printing hammers in the odd-number group are arranged in the upper side of the printing line so that the printing pins extend downwardly and the printing hammers in the even-number group are arranged in the lower side of the printing line so that the printing pins extend upwardly. The printing pins in each of the sub groups of the odd-number group are positioned along a straight line inclined by a predetermined angle with respect to the printing line and the printing pins of the printing hammers in each of the sub groups of the even-number group are positioned along another straight line parallel to the aforementioned straight line. In order to facilitate fabrication of the printing hammers, the printing hammers in each of the sub groups are formed integrally to be in a comb-like shape.

REFERENCES:
patent: 4386563 (1983-06-01), Farb
patent: 4387642 (1983-06-01), Bringhurst et al.
patent: 4503768 (1985-03-01), Whitaker
patent: 4550659 (1985-11-01), Yamanaga
patent: 4599007 (1986-07-01), Khorsand
patent: 4704041 (1987-11-01), Hayashi et al.
patent: 4777875 (1988-10-01), Fujiwara et al.
patent: 4879947 (1989-11-01), Kurosawa et al.
patent: 4882987 (1989-11-01), Sakai et al.
E. G. Lean et al.; "Print Hammer Mounting Arrangement for a Matrix Printer"; IBM Tech Disc Bull.; vol. 27, No. 2, pp. 1099-1100; Jul. 1984.
E. M. Baily et al; "Optimizing the Performance of an Electromechanical Print Mechanism"; Hewlett Packard Journal; Nov. 1978; pp. 23-31.
IBM Technical Disclosure Bulletin vol. 27, No. 2, Jul. 1984, pp. 1099-1100, "Print Hammer Mounting Arrangement"; Lean et al.

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