Ink-jet printhead-to-paper referencing system

Details Ink-jet printhead-to-paper referencing system Ink-jet printhead-to-paper referencing system

B - Operations, Transporting

41

J

197/83, 101/96.0

B41J 13/28 (2006.01) B41J 11/00 (2006.01) B41J 11/20 (2006.01)

Patent

CA 1306896

INK-JET PRINTHEAD-TO-PAPER REFERENCING SYSTEM ABSTRACT OF THE DISCLOSURE Several problems of alignment associated with ink- jet printers are alleviated by four aspects. In the first, a reverse bow ( ) in the paper (12) is created for printing on single sheets of paper. The reverse bow, which is in the transverse axis of the paper, forces the paper flat against the platen (12) by using the paper's own stiffness. In the second aspect, the paper and the carriage (30) are referenced to the same part (the carriage guide (10)). In this configuration, the paper is urged against the underside of the carriage guide off of drive rollers (18), through the reverse bow, and onto the platen, where it is printed. The carriage is ref- erenced to the carriage guide through a slider bump by means of a carriage shaft and gravity. The carriage guide comprises stiff thin sheet metal, which is closely-toleranced and has well-con- trolled dimensions. Thus, this part is good to refer- ence to, rather than molded-in parts, which are not stiff enough at the required thickness. Straightness is also difficult to achieve at the required thickness with plastic parts. In the third aspect, the platen is allowed to move substantially perpendicular to the plane of the paper to accommodate thicker print media. In the fourth aspect, the platen is maintained a minimum fixed distance from the carriage guide by bumps (38) to ensure that the paper is not pinched between the carriage guide and the platen.

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