Sheet Conveyance Device With Swingable Third Unit
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Solution Overview
Problem
Conventional sheet conveyance devices in sheet-fed offset rotary printing presses require significant operator effort and time to adjust to changes in sheet size, as they need to re-engage and re-phase gear mechanisms for impression cylinders, complicating the process of switching between single-sided and double-sided printing.
Innovation Solution
A sheet conveyance device with a swingable third conveyance unit and an independent driving unit that adjusts the speed of the transport cylinder based on sheet size, allowing for seamless adaptation to different sheet dimensions without the need for mechanical adjustments, ensuring reliable transfer and gripping of sheet edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If gear mechanisms are re-engaged and re-phased for impression cylinder when sheet size is changed, then the printing press can accommodate different sheet sizes, but the operator's burden increases and preparation time is considerably extended
Solution Approach 1:
The patent replaces the traditional mechanical gear engagement system with an independent driving unit that uses electronic control to adjust the phase of the impression cylinder. This substitution eliminates the need for manual gear re-engagement when changing sheet sizes, thereby reducing operator burden and preparation time while maintaining sheet size adaptability
Solution Approach 2:
The patent changes the operational parameters of the impression cylinder by using an independent driving unit that can electronically adjust the phase and speed of the cylinder. This allows the system to adapt to different sheet sizes by modifying rotational phase parameters rather than through mechanical gear changes, significantly reducing preparation time
2Adaptability or versatility
If gear mechanisms are re-engaged and re-phased for impression cylinder when sheet size is changed, then the printing press can accommodate different sheet sizes, but the complexity of the adjustment process increases
Solution Approach 1:
The patent replaces the complex mechanical gear engagement and phasing system with an electronically controlled independent driving unit. This substitution simplifies the operation by eliminating manual gear manipulation, making the system easier to operate while maintaining full adaptability to different sheet sizes
Solution Approach 2:
The independent driving unit automatically adjusts the phase of the impression cylinder based on the selected sheet size, eliminating the need for operator intervention in the adjustment process. This self-adjusting capability simplifies operation and reduces the skill level required for changing sheet sizes
Data Source
AI summary
A sheet conveyance device including first to third conveyance units, independent driving unit, device driving unit, and control unit. The first conveyance unit includes a first holder that holds one edge of a sheet, and conveys the sheet. The second conveyance unit includes a second holder that holds one edge of the sheet, and conveys the sheet. The third conveyance unit is supported to be swingable between a reception position at which it receives the sheet from the first conveyance unit, and a transfer position at which it transfers the sheet to the second conveyance unit. The third conveyance unit includes a third holder that holds the other edge of the sheet conveyed by the first conveyance unit, and conveys the sheet held by the third holder. The independent driving unit drives the first conveyance unit. The control unit adjusts the speed at which the sheet is conveyed.