Image forming apparatus and control method thereof

Abstract

Provided is an image forming device including: a sheet number control part for controlling a maximum processable sheet number set on a paper attribute basis for a finisher for finishing a printed sheet; an automatic tray switching part for switching an initially selected tray part to another tray part when paper runs out in the midst of print processing on sheets fed from the initially selected tray part to continue the print processing, the initially selected tray part being initially selected from a plurality of tray parts holding sheets of different paper attributes; and a tray switch determining part for, when a feeding tray part runs out of paper in the midst of print processing set to execute finishing, determining whether to actuate the automatic tray switching part on the basis of maximum processable sheet numbers and a paper attribute of paper of a selectable tray part candidate.

Description

technical field [0001] The present invention relates to an image forming apparatus including: a sheet number management unit that manages the number of sheets to be printed by a post-processing device (hereinafter referred to as "finisher") for a stapler or a punching machine (punching mechanism). The upper limit of the processing sheets set by the attribute; and the automatic paper feed switching section, among the multiple paper supply sections that respectively accommodate paper with different paper attributes, when the paper of the initially selected paper supply section is used in the printing process When it runs out, switch to another paper feeder to continue the printing process. In addition, the present invention also provides a control method for the above-mentioned image forming apparatus. Background technique [0002] Conventionally, an automatic paper feed switching unit (hereinafter referred to as “ATS (Auto Tray Selector)”) is installed in an image forming ap...

AI Technical Summary

Problems solved by technology

[0008] For example, during the execution of the printing process set to print on "plain paper" with the number of output sheets of 25, the paper breaks when 15 sheets are supplied from the cassette containing "plain paper", When the 16th sheet or later is supplied by the ATS from a cassette containing "high-quality paper", if the total number of printed sheets reaches the upper limit of 20 sheets corresponding to "high-quality paper", it is judged that it cannot be stapled, and thus The print process was interrupted

[0009] In such a case, since the printing job is interrupted before the set 25-sheet printing is inconvenient, the meaning of improving work efficiency by the automatic paper feed switching unit is lost.

[0010] Afterwards, even if the paper cassette is replenished with "plain paper" and the printing process is continued, "plain paper" and "high-quality paper" are mixed in an unnatural state in the printing paper, and it is urgent to print again with "plain paper", thereby Printed paper output on "premium paper" is wasted

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