The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 1979
Filed:
Dec. 06, 1977
Minoru Ito, Tokyo, JP;
Ricoh Co., Ltd., Tokyo, JP;
Abstract
A ferromagnetic core fixed to an end of a wire is electromagnetically attracted such that the core and wire are axially moved so that the free end of the wire strikes paper through a ribbon to print a dot. A leaf spring returns the core and wire to a standby position in which the core abuts against a stopper and the leaf spring is resiliently deformed. A washer having an annular axially extending projection is urged by a compression spring against a spring seat, thereby urging the spring seat against a shoulder of a housing. The leaf spring is disposed in an annular gap between the washer and spring seat. The washer serves the dual function of preventing movement and frictional abrasion of the spring seat and absorbing impact energy of the core against the stopper upon axial wear of the core and stopper.