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Orthogonalization of Electrostatic Printing

IP.com Disclosure Number: IPCOM000090255D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Gamblin, RL: AUTHOR [+2]

Abstract

One of the disadvantages encountered in jet printing is the slanting of characters during their formation. Such slanting arises from the fact that the web or sheet on which the characters are formed is moving orthogonally to the printer deflection plates, the structure controlling the formation of the characters. The slanting can be corrected by tilting the deflection plates to an angle sufficient to compensate for the character slant in accordance with an expression stated subsequently.

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Orthogonalization of Electrostatic Printing

One of the disadvantages encountered in jet printing is the slanting of characters during their formation. Such slanting arises from the fact that the web or sheet on which the characters are formed is moving orthogonally to the printer deflection plates, the structure controlling the formation of the characters. The slanting can be corrected by tilting the deflection plates to an angle sufficient to compensate for the character slant in accordance with an expression stated subsequently.

In drawing A, jet stream 1 issues from nozzle 2 of a jet printer on which an AC voltage is applied. Web 3 is shown moving to the right as jet stream 1 passes through an electrostatic field generated and controlled by deflection plates 4 orthogonally oriented with respect to the web. Character formation in this manner results in the characters being slanted relative to the edges of web 3.

To compensate for this disadvantage, deflection plates 4 are oriented in the manner shown in drawing B, relative to the edges of web 3. The angle of tilt is determined in accordance with the expression tan omega = V(p)/V(s) where V(s) = drop sweep speed effective on paper = RL in inches/second and V(p) = paper speed = RM in inches/second. The actual drop sweep speed = RK. K = actual drop deflection in inches/ line. L = length of printed line in inches/line. M = distance between lines = paper travel/line in inches/line. N = drops/line, Q = drops/ second,...