Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1987-10-23
1989-06-27
Miller, Jr., George H.
Recorders
Markers and/or driving means therefor
With ink supply to marker
346136, 400 55, 400 56, 400126, G01D 1518, G01D 1534, B41J 1120
Patent
active
048433381
ABSTRACT:
Several problems of alignment associated with ink-jet printers are alleviated by four aspects. In the first, a reverse bow (B) in the paper (12) is created for printing on single sheets of paper. The reverse bow, which in the transverse axis of the paper, forces the paper flat against the platen (14) 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 referenced to the carriage guide through a slider bump by means of a carriage shaft and gravity.
The carraige guide comprises stiff thin sheet metal, which is closely-toleranced and has well-controlled dimensions. Thus, this part is good to reference 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.
REFERENCES:
patent: 4623898 (1986-11-01), Yamamoto
patent: 4644371 (1987-02-01), Matsuura et al.
patent: 4728963 (1988-02-01), Rasmussen et al.
Jackson Larry A.
Pinkernell David W.
Rasmussen Steve O.
Hewlett--Packard Company
Kassatly S. A.
Miller Jr. George H.
Redding, Jr. Bloor
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