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Automated Printhead Positioning to Machine Orientation Slot

IP.com Disclosure Number: IPCOM000040361D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Barenboim, M: AUTHOR [+5]

Abstract

The orientation of a printhead in the carriage of a dot matrix printer is critical to printing registration. One means of achieving accurate orientation is the engagement of a carriage pin by a closely toleranced printhead slot. Machining such a printhead slot on an automated production line requires rapid, accurate, mechanical positioning of the printhead in the machining station. The present embodiment accomplishes this task by the use of a special fixture to clamp and position the printhead. Fig. 1 shows printhead l0. Orientation slot 11 is cut in spring plate 12 on a centerline that intersects centerline 13 of the printhead. The plane bounded by these two centerlines must be parallel to the centerline 14 of the first row of print wire holes 15. Wire guide 16 is provided with extension 17.

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Automated Printhead Positioning to Machine Orientation Slot

The orientation of a printhead in the carriage of a dot matrix printer is critical to printing registration. One means of achieving accurate orientation is the engagement of a carriage pin by a closely toleranced printhead slot. Machining such a printhead slot on an automated production line requires rapid, accurate, mechanical positioning of the printhead in the machining station. The present embodiment accomplishes this task by the use of a special fixture to clamp and position the printhead. Fig. 1 shows printhead l0. Orientation slot 11 is cut in spring plate 12 on a centerline that intersects centerline 13 of the printhead. The plane bounded by these two centerlines must be parallel to the centerline 14 of the first row of print wire holes 15. Wire guide 16 is provided with extension 17. The slotting task is performed in a typical automated production cell consisting of a six-station rotary table. Station one loads and unloads the printhead into the special fixture, station two aligns the printhead, and station three machines the slot. (Stations four, five and six perform additional tasks). Fig. 2 shows the details of special fixture 20. It has three printhead orienting features: upper V- block 21, lower V-block 22, and locating pin 23. It is provided with clamp 24. Fig. 3 shows printhead that the upper and lower diameters of wire guide 16 are respectively clamped into upper V-block 21 and lower V-b...