Method for fashioning ink channels in a write head for a dot-matrix ink printer means

US4868583A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Karl-Heinz Dreinhoff · Berlin, DE
• Harald Schulz · Kammeltal, DE

Key dates

• Filing date: Aug 10, 1988
• Grant date: Sep 19, 1989
• Expiry date: Aug 10, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41J2/1615
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A method for fashioning ink channels in a write head for a dot-matrix ink printer means, whereby form needles respectively coated by parting agent and cylindrically surrounded by piezo electric drive elements are aligned in a casting mold in accord with the desired course of the ink channels to be fashioned, are cast out with a casting compound and, after the curing of the latter, are removed upon formation of the respective ink channels partially surrounded by the allocated piezo electric drive elements, and isolation of the drive elements from a writing fluid in the ink channels is achieved in a way that is simple in terms of production engineering. An envelope coat is applied to the form needles coated with parting agent, being applied thereto before they are introduced into the casting mold, this envelope layer forming the inside channel wall of the appertaining ink channel after the removal of the form needles and of the parting agent. The new method serves the purpose of manufacturing ink printer heads that work based on the principle of individual drop ejection (drop on demand).