John R Bertschy

US Patent:

44032277, Sep 6, 1983

Filed:

Oct 8, 1981

Appl. No.:

6/309871

Inventors:

John R. Bertschy - Boulder CO
Walter E. Broom - Boulder CO

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G01D 1518

US Classification:

346 75

Abstract:

In continuous flow ink jet printers, over 95% of the ink in the ink reservior is recirculated each time the volume of ink in the reservoir is cycled through the printer. The apparatus herein provides a very low evaporation rate for the recirculating ink. With a low evaporation rate, the ink may be replenished with ink alone rather than having to supply ink concentrate and solvent to readjust the ink composition. The low evaporation rate is achieved by keeping the temperature of the ink in the reservoir and at the print head near ambient temperature of the printer's environment and by minimizing the air flow through the reservoir. In addition, the ink in the reservoir is replenished as it is consumed.

US Patent:

45890366, May 13, 1986

Filed:

Dec 3, 1984

Appl. No.:

6/677761

Inventors:

John R. Bertschy - San Jose CA
T. Jay Cameron - San Jose CA
Kenneth L. Deckert - San Jose CA
Sylvia L. Lee - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 554

US Classification:

360 75

Abstract:

The start-up of a rotating disk file is controlled by first moving the sliders (30, 32, 40, 42) supporting the read/write heads radially outwardly from the inside diameter (20) of the disks (10, 12, 14) by applying a voltage from voltage source (70) to voice coil motors (34, 44), sensing the position of the sliders (30, 32, 40, 42) on the disk surfaces with a position sensor (80), initiating rotation of the disk drive motor (18) when the sliders (30, 32, 40, 42) have moved a dewetting distance, and terminating radial translation of the sliders (30, 32, 40, 42) when the disk drive motor (18) has reached operating speed and the sliders (30, 32, 40, 42) are riding on a bearing of air above the disk surfaces. The instrumented radial translation of the sliders (30, 32, 40, 42) overcomes the stiction forces at the slider-disk interface without damage to the read/write heads, the disks (10, 12, 14) or the slider suspensions (36, 38, 46, 48).