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. 12, 1983
Filed:
Jan. 26, 1981
Houshang Rasekhi, Convent Station, NJ (US);
Alfred M Nelson, Redondo Beach, CA (US);
Wang Laboratories, Inc., Lowell, MA (US);
Abstract
Magnetographic printing, method and apparatus are used to generate letter-quality, relatively high speed transfer of magnetic toner particles from a magnetic tape to paper. A pretransfer force (f.sub.1) holding the toner to the tape is established which may be magnetic, or both magnetic and electrostatic in nature. The transfer operation employs relatively high speed approaching movement of the tape toward the paper in a controlled manner such that forces (f.sub.2) exerted on the toner particles due to the rapidly closing movement including forces created by air currents are collectively less than the toner-holding force (f.sub.1) for any instantaneous separation between the tape and paper. The operation may include the use of a bias voltage to generate a component of the electrostatic holding force and the use of a corotron to deposit electrostatic charge on the magnetic toner particles. The controlled movement of the tape toward the paper is achieved with a cam in one embodiment and with a solonoid in another embodiment.