Constant pressure printing mechanism for portable label printing

Details Constant pressure printing mechanism for portable label printing Constant pressure printing mechanism for portable label printing

1978-05-25

1980-06-10

Pieprz, William

Printing

Bed-and-platen machines

Web

101298, 101288, 400652, 400437, 156384, B41J 500

Patent

active

042067049

ABSTRACT:
A constant pressure printing mechanism for use in a portable label printing machine, or the like: a pressing member is attached to a hand operated driving lever which carries the printing head and which is pivotally attached to the machine frame; a separate rocking lever is pivotally attached to the machine frame; a pressure receiving member attached to the rocking lever is in position to be engaged by the pressure member as the driving lever pivots; continued pivoting of the driving lever causes subsequent separation of the pressure receiving and pressure members, thereby again freeing the rocking member from being pivoted; a platen pivotally secured to the machine frame is normally biased away from the printing head; an elastic buffer member is stretched between the rocking lever and the platen for pivoting the platen toward the printing head when the rocking member is pivoted by the pressure member; with the provision of the constant pressure printing mechanism of the invention, the intensity and the contact time in printing can be regularized irrespective of the intensity and the time length of the squeezing of hand lever, thereby attaining clear and precise printing of uniform darkness without causing double printing and blurring of ink.

REFERENCES:
patent: 2073902 (1937-03-01), Olivetti
patent: 2342898 (1944-02-01), Sand, Jr.
patent: 2519477 (1950-08-01), Kind
patent: 4072105 (1978-02-01), Becker et al.
patent: 4125419 (1978-11-01), Hamisch, Jr.

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