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Horizontal Ink Stream Deflection During Vertical Deflection Sensitivity Adjustment

IP.com Disclosure Number: IPCOM000079627D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Phillips, DW: AUTHOR

Abstract

Periodic adjustment of the vertical deflection system in an ink jet printer must be automatically made, in order to maintain a constant character height at the printing surface. During the vertical location sensing of the ink stream which is necessary for this adjustment, ink should not be allowed to reach the printing surface. The method described keeps the ink from reaching the printing surface during sensing and adjustment.

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Horizontal Ink Stream Deflection During Vertical Deflection Sensitivity Adjustment

Periodic adjustment of the vertical deflection system in an ink jet printer must be automatically made, in order to maintain a constant character height at the printing surface. During the vertical location sensing of the ink stream which is necessary for this adjustment, ink should not be allowed to reach the printing surface. The method described keeps the ink from reaching the printing surface during sensing and adjustment.

The ink stream is horizontally deflected to a stationary vertical gutter during sensing and adjustment. The ink is collected in the gutter and returned to the ink reservoir for reuse. In the figure, which is a top elevation, a is the ink jet nozzle, b is the charge electrode, c is the charge-sensing electrode, d and e are horizontal electrostatic deflection plates, f is the top vertical electrostatic deflection plate, g is a vertical gutter, h is the printing surface, j is the normal ink stream path, k is the ink stream path with horizontal deflection applied, a is the vertical position sensing device or electrodes, and m is the lower gutter.

Operation is as follows: when the logical decision is made to check the vertical deflection sensitivity, the ink stream j is held in the lower gutter m while deflection voltage is applied to the horizontal deflection plates d and e. Horizontal deflection k is insignificant at this time, due to the very low charge level o...