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Ink Concentration Monitor

IP.com Disclosure Number: IPCOM000088631D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Haskell, JW: AUTHOR

Abstract

Shown above is a device for measuring ink concentration. The device includes a float 10, an electromagnet 15, and a read switch 16. The float includes trimmer weights 21, float ballast 22, and a magnet 23. The float 10 is confined in a ink reservoir 30.

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Ink Concentration Monitor

Shown above is a device for measuring ink concentration. The device includes a float 10, an electromagnet 15, and a read switch 16. The float includes trimmer weights 21, float ballast 22, and a magnet 23. The float 10 is confined in a ink reservoir 30.

With normal ink concentration, the float 10 rests on the reservoir bottom, centered over the reed switch 16. The float permanent magnet 23 will close the reed switch 16 in this position. If the float 10 should rise one inch or more from the bottom, the reed switch 16 will open. Periodically, the reed switch 16 condition is tested (by circuitry not shown) to determine the float position.

Because of magnetic attractive force between the float magnet 23 and the reed switch 16, normally it would require up to 50 percent increase in concentration to cause the float 10 to rise. This situation avoided by a simple procedure as follows. Several seconds before testing the reed switch, the reed switch ciol 15 is energized.

The coil polarity is arranged to produce a repelling force to the float magnet 23 greater than the attractive force. This moves the float 10 vertically so that after a short interval the float is essentially free of the attractive force, and during the next several seconds it either rises to the top or sinks back to the bottom according to the true state of the ink concentration. After ten seconds, the reed switch condition is tested. An open reed switch would cause make-up water...