Printing hammer comprising two hinge parts coupling an arm to a

Details Printing hammer comprising two hinge parts coupling an arm to a Printing hammer comprising two hinge parts coupling an arm to a

1988-02-08

1989-12-12

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 310328, B41J 312

Patent

active

048863823

ABSTRACT:
In a printing hammer which is for use in a printer head and comprises a piezoelectric actuator (16) coupled to a base member (15) by a resilient coupler (23), an arm (19) carrying a printing wire (26), and a first resilient hinge (21) coupling the piezoelectric actuator to the arm, first and second resilient parts (221, 222) are used collectively as a second resilient hinge which couples the arm to the base member. The first and the second resilient parts are both sides of the first resilient hinge on a single plane which has a step of a predetermined size relative to the first resilient hinge in a direction of its thickness. The piezoelectric actuator may be fixed directly to the base member in order to give the printing hammer a high printing speed. Preferably, the first resilient hinge and the first and the second resilient parts are manufactured separately of the arm and/or the base member and brazed in grooves formed in a thick arm end with a spacing of the predetermined size, in a groove formed in an actuator block of the piezoelectric actuator, and in grooves formed in a pair of side legs of the base member. The first resilient hinge may have a T form with the top stroke of the T form brazed in the groove. The first and the second resilient parts may be both branches of a U form.

REFERENCES:
patent: 3955049 (1976-05-01), MacNeil
patent: 4435666 (1984-03-01), Fukui
patent: 4547086 (1985-10-01), Matsumoto
patent: 4644213 (1987-02-01), Shibuya

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