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Self Compensating Selector

IP.com Disclosure Number: IPCOM000088176D
Original Publication Date: 1977-Apr-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR [+3]

Abstract

In a magnetic ink jet printer (Fig. 1) ferromagnetic ink drops 10 are projected past a magnetic selector 11 and a magnetic deflector 12 toward a print medium 13. Magnetic selector 11, when energized by current pulses, causes drops not used for printing to be horizontally deflected into a gutter 14. Magnetic deflector 12 is energized by a scan generator which causes the ink drops 10 to be vertically deflected for deposition on print medium 13 to form data patterns.

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Self Compensating Selector

In a magnetic ink jet printer (Fig. 1) ferromagnetic ink drops 10 are projected past a magnetic selector 11 and a magnetic deflector 12 toward a print medium
13. Magnetic selector 11, when energized by current pulses, causes drops not used for printing to be horizontally deflected into a gutter 14. Magnetic deflector 12 is energized by a scan generator which causes the ink drops 10 to be vertically deflected for deposition on print medium 13 to form data patterns.

As seen in Fig. 2, the magnetic selector 11 comprises a magnetic core 15 and coils 15 and 17. Magnetic core 15 has four poles A, B, C and D, which define a center gap position. If the ink drops 10 to be used for printing are vertically off center when they enter the gap between poles A -D. They experience a vertical compensation force when coils 16, 17, 18 and 19 are energized to develop the polarization shown. The vertical compensation forces are such that a stream passing above center will be corrected downward and a stream passing below center will be corrected upward.

These corrections place the print drops of the stream in a corrected position when they pass through the deflector 12, thereby resulting in a drop aim compensation at the print medium 13. Without this correction, vertical error in the print drop placement at selector 11 is otherwise amplified when the drops pass through deflector 12, resulting in large error at print medium 13. This article replaces the one p...