Printing pressure buffer mechanism or constant pressure printing

Details Printing pressure buffer mechanism or constant pressure printing Printing pressure buffer mechanism or constant pressure printing

1978-05-11

1980-10-14

Pieprz, William

Printing

Bed-and-platen machines

Web

101298, 156384, 173120, 74 97, 400166, 400388, 400437, 400686, 227132, B41K 500, B41J 942

Patent

active

042274567

ABSTRACT:
In a hand-operated label printing machine, including a hand lever and a printing head attached to the hand lever; a printing pressure buffer mechanism or a constant pressure printing mechanism which comprises: in a first embodiment, a spring-actuated engaging member formed in the hand lever and a cooperating checking shoulder which is formed in the main body of the machine; an inclined groove leads to the shoulder; the shoulder is brought into disengageable engagement with the spring-actuated engaging member for moderating the printing pressure; and when the spring-actuated engaging member rides over the checking shoulder, the printing head is actuated; in a second embodiment, a pressure receiving engaging member is carried on the hand lever, through a lost motion connection; a pressure contact member and a guide member are both carried on the main body of the machine and are spaced apart; the pressure receiving engaging member is integrally provided with a pressure receiving piece having a cam surface at the tip end thereof and with a guide piece, spaced from the pressure receiving piece and having an engaging portion at the tip end thereof; when the hand lever is actuated, the cam surface of the pressure receiving engaging member rides across the pressure contact member and the printing is performed at a predetermined pressure; at the same time, the engaging portion of the guide piece is brought into resilient engagement with the guide member to moderate the shock in the printing stroke.

REFERENCES:
patent: 879123 (1908-02-01), Smith
patent: 1967436 (1934-07-01), Going
patent: 2455270 (1948-11-01), Ravella
patent: 2894613 (1959-07-01), Ayres
patent: 3008482 (1961-11-01), Hunter
patent: 3362326 (1968-01-01), Delpo et al.
patent: 3467355 (1969-09-01), Burke
patent: 4072105 (1978-02-01), Becker et al.
Mathews, Print Hammer Mechanism, IBM Tech. Discl. Bulletin, vol. 19, No. 9, pp. 3245-3246, 2/1977.

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