Printing – Stenciling – Rotary machines
Reexamination Certificate
1998-12-30
2001-04-10
Yan, Ren (Department: 2854)
Printing
Stenciling
Rotary machines
C271S010030
Reexamination Certificate
active
06213015
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a stencil printer or similar printer.
Various kinds of papers have customarily been used with a stencil printer or similar printer. Thin papers, for example, include rough printing papers and fine 45 kg papers. Papers of standard thickness (sometimes referred to as standard papers hereinafter) include copy papers, mediumquality papers, fine quality 55 kg papers, recycled papers, and fine papers for stencil printers. Further, thick papers include drawing papers, postcards, envelopes, fine 135 kg papers, and fine 160 kg papers.
To guarantee the paper feeding and discharging ability of the printer, i.e., to reduce troubles relating to paper transport as far as possible, it is necessary to variably set optimal transport conditions at the paper feed section, paper discharge section and other various sections of the printer in accordance with the kind of papers including thickness and size. This is because particular optimal transport conditions exist for each kind of papers. Necessary transport conditions to be set include a paper feed pressure, a paper separation pressure, a jump board angle and a side fence position relating to paper discharge, and a tray angle relating to paper feed. The troubles relating to paper transport are typified by the simultaneous feed of two or more papers (sometimes referred to as overlap feed hereinafter), the failure of paper feed (sometimes referred to as feed failure hereinafter), and jams occurring at the paper feed section and paper discharge section.
It is a common practice for the operator, user or serviceman (operator hereinafter) to determine the kind of papers by confirming the thickness and size of papers by eye, and manually switch a pick-up roller pressure, a separation pad pressure, a jump board angle and so forth in such a manner as to set up optimal transport conditions for the papers.
In practice, however, it is extremely difficult for an ordinary or untrained operator to determine or set optimal transport conditions paper by paper. For this reason, the manual switching function available with the printer has been rarely used, resulting in the troubles relating to paper transport.
Moreover, when any one of the troubles occurs, the operator is often simply perplexed and cannot see or execute an optimal troubleshooting measure. Although an operation manual attached to the printer describes measures for dealing with various kinds of troubles specifically, it is not readable for ordinary operators and is, if readable, troublesome and time-consuming to read.
Technologies relating to the present invention are disclosed in, e.g., Japanese Patent Publication No. 5-32296, Japanese Patent Laid-Open Publication Nos. 9-30714, 9-235033 (corresponding to U. S. Ser. No. 08/719,960, filed Sep. 24, 1996) and 10-139191 (corresponding to U.S. Ser. No. 08/925,648, filed Sep. 9, 1997), Japanese Utility Model Publication Nos. 4-23862 and 5-18342, and Japanese Patent Laid-Open Publication Nos. 9-20436, 8-259099, 9-26678, and 2-144335.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a printer capable of automatically determining, only if the operator, trained or not, selects and inputs the kind of papers while watching an LCD (Liquid Crystal Display) provided on an operation panel without any manual switching operation, optimal transport conditions matching with the kind of papers and setting up the optical conditions, thereby obviating transport troubles.
It is another object of the present invention to provide a printer capable of automatically varying, only if the operator inputs the kind and degree of a transport trouble while watching an LCD provided on an operation panel, existing transport conditions, thereby setting up optimal conditions for obviating the trouble and making a troubleshooting operation extremely simple.
It is a further object of the present invention to provide a printer capable of storing optimal conditions selected and allowing them to be called every time papers of the same kind are used, thereby obviating the repetition of troublesome setting.
A printer for printing an image on a paper paid out by a pick-up roller and separated from the other papers by a separating device of the present invention includes a kind-of-paper setting device for allowing the operator of the printer to select and input the kind of papers to be used. A controller automatically selects, among transport conditions stored beforehand in correspondence to the kinds of papers, optimal transport conditions matching with the kind of papers input by the operator in response to a signal received from the kind-of-paper setting device.
REFERENCES:
patent: 2-144335 (1990-06-01), None
patent: 4-23862 (1992-06-01), None
patent: 5-32296 (1993-05-01), None
patent: 5-18342 (1993-05-01), None
patent: 8-259099 (1996-10-01), None
patent: 9-26678 (1997-01-01), None
patent: 9-20436 (1997-01-01), None
patent: 9-30714 (1997-02-01), None
patent: 9-235033 (1997-09-01), None
patent: 10-139191 (1998-05-01), None
Endo Kenji
Hasegawa Toshiharu
Kanno Yoshiharu
Sato Mitsuo
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Tohoku Ricoh Co. Ltd.
Yan Ren
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