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Determination of Printhead Wireguide Position for Printwire Grinding Operation

IP.com Disclosure Number: IPCOM000040942D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Barenboim, M: AUTHOR [+5]

Abstract

In dot matrix wire printers it is important, for uniform dot-to-dot print quality, that when actuated during printing, the tips of the individual print wires (missiles) all project from the surface of the wireguide the same precise predetermined height. This is usually assured during printhead production by simultaneously grinding the tips of all missiles while held in the unoperated position with excess length projecting above the surface of the wireguide. Problems are experienced in automated production, however, in accurately positioning the printhead with respect to the grinder. A system in which a fixture clamps to some mechanical feature of the printhead established as a reference point introduces tolerances in both the printhead and the fixture making it difficult to achieve the required accuracy.

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Determination of Printhead Wireguide Position for Printwire Grinding Operation

In dot matrix wire printers it is important, for uniform dot-to-dot print quality, that when actuated during printing, the tips of the individual print wires (missiles) all project from the surface of the wireguide the same precise predetermined height. This is usually assured during printhead production by simultaneously grinding the tips of all missiles while held in the unoperated position with excess length projecting above the surface of the wireguide. Problems are experienced in automated production, however, in accurately positioning the printhead with respect to the grinder. A system in which a fixture clamps to some mechanical feature of the printhead established as a reference point introduces tolerances in both the printhead and the fixture making it difficult to achieve the required accuracy.

The figure shows the present embodiment in which an LVDT 1 directly determines the position of the wireguide surface 2 with respect to grinder 3. An LVDT (Linear Variable Differential Transducer) is a known device that converts linear movement to digital output. The output of the LVDT controls the height adjustment 4 of grinding wheel 5 which then moves 6 across wireguide 2 grinding missiles 7 to correct dimension.

(Image Omitted)

Disclosed anonymously

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