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:
Jul. 08, 1986
Filed:
Jun. 05, 1984
Takeyoshi Tsuge, Mishima, JP;
Yoshihiro Torisawa, Mishima, JP;
Ayumu Makino, Mishima, JP;
Tsutomu Kimura, deceased, late of Mishima, JP;
Tokyo Electric Co., Ltd., Tokyo, JP;
Abstract
An ink dot printer includes an ink tank for storing magnetic ink, a pair of magnetic pole plates arranged opposite to each other to form a slit, one end of the pair of plates being immersed in the magnetic ink in the ink tank. An electromagnet magnetizes the paired magnetic pole plates to introduce the magnetic ink in the ink tank into the slit to form a magnetic ink film therein, and a plurality of needles arranged adjacent to one another in the longitudinal direction of the slit are each freely movable in the longitudinal direction of the needle between a first position where its one end portion is immersed in the magnetic ink film in the slit between the paired magnetic pole plates and a second position where its one end portion is projected from the magnetic ink film in the slit. An electromagnet selectively drives the needles to move them from the first to the second position, and a variable resistance controls the strength of magnetic force generated by the electromagnet by controlling the voltage supplied to the electromagnet. Magnetic ink, which has been stuck to the one ends of the needles at the first position, is forced onto a recording paper at the second position to form dots of magnetic ink of controlled density. By the gathering of the dots, symbols such as characters and numerals are printed.