Image Forming Apparatus Printing Mode Switching Control
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Solution Overview
Problem
Existing image forming apparatuses face productivity issues when handling mixed batches of one-sided and two-sided originals due to unnecessary switching operations between one-sided and two-sided printing modes, leading to increased waiting times and reduced productivity.
Innovation Solution
An image forming apparatus with an input unit, sheet feeding unit, image forming unit, and printing mode switching unit that determines whether a one-sided print job should be performed in one-sided or two-sided mode based on the number of sheets continuously printed, allowing for alternate sheet feeding and re-feeding to optimize printing without using the sheet re-feeding conveyance path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two-sided printing is performed by alternately printing front and back sides using a single printing mechanism, then the apparatus size and cost are reduced, but the conveyance path becomes longer and waiting time increases remarkably
Solution Approach 1:
The invention feeds a predetermined number of sheets (e.g., 3 sheets) in advance to the printing mechanism before starting two-sided printing. This preliminary action ensures that when the printing mechanism finishes printing the front side of a sheet, the next sheet is already positioned and ready, eliminating waiting time. The sheet feeding unit continuously supplies sheets to the conveyance path, so that sheets are always available for immediate printing on both sides without requiring the mechanism to idle.
Solution Approach 2:
The invention maintains continuous printing operation by having the sheet feeding unit operate continuously to supply sheets to the conveyance path. The printing mechanism alternates between printing front sides and back sides without interruption, as sheets are continuously fed and positioned. This eliminates idle time and ensures the printing mechanism is always engaged in useful work, dramatically improving productivity compared to traditional alternate printing methods.
2Ease of operation
If automatic switching between one-sided and two-sided printing is implemented, then operator setting operations are eliminated, but unnecessary switching operations occur when handling mixed batches, reducing productivity
Solution Approach 1:
The invention dynamically adjusts the printing mode based on the detected composition of the original batch. The control unit monitors whether one-sided or two-sided originals are being processed and automatically selects the appropriate printing mode (one-sided printing mode or two-sided printing mode with preliminary feeding). This dynamic adaptation prevents unnecessary mode switching, maintaining high productivity whether handling one-sided originals, two-sided originals, or mixed batches.
Solution Approach 2:
The system performs self-determination of the appropriate printing mode by automatically detecting the type of originals being processed. The control unit analyzes the original batch composition and autonomously decides whether to use one-sided or two-sided printing without requiring operator intervention or causing unnecessary switching. This self-service capability eliminates both manual setting operations and unnecessary automatic switching that would reduce productivity.
3Device complexity
If two-sided printing is performed by alternately printing front and back sides, then a single printing mechanism is used, but the conveyance path length increases and sheet must be re-conveyed
Solution Approach 1:
The invention feeds sheets in advance to the conveyance path before printing begins. By having sheets预先 positioned in the conveyance path, the sheet does not need to be re-conveyed from the sheet feeding unit after the front side is printed. The sheet is already in position for immediate back side printing, eliminating the need for a long conveyance path and reducing the physical distance sheets must travel.
Data Source
AI summary
An image forming apparatus which is capable of avoiding unnecessary switching operation to switch between a one-sided printing and a two-sided printing to improve print productivity. A printing mode is switched between a two-sided printing mode to continuously form images on first sides of a predetermined number of sheets and to alternately form images on second sides of sheets conveyed along a sheet re-feeding conveyance path and on the first sides of sheets fed from a sheet feeding unit, and a one-sided printing mode without using the sheet re-feeding conveyance path. It is determined that, when a one-sided print job is performed between a two-sided print jobs, whether the one-sided print job is performed in the two-sided printing mode as-is or in the one-sided printing mode, depending on whether the number of sheets continuously printed by the one-sided print job is more than a predetermined number.