Sheet Processing Apparatus Gripper Reversal Mechanism
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Solution Overview
Problem
Conventional sheet-fed offset rotary printing presses with reversing mechanisms are large and occupy significant space due to separate units for printing on the obverse and reverse surfaces of sheets, lacking a compact solution for high-quality double-sided printing.
Innovation Solution
A compact sheet processing apparatus utilizing a single printing cylinder with gripper devices for both obverse and reverse surface printing, achieved through a gripper device-based sheet conveyance and reversal mechanism that maintains high registration accuracy, allowing for efficient double-sided printing without increasing the apparatus' size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate printing units are provided for obverse and reverse surfaces, then printing quality is improved, but apparatus size increases
Solution Approach 1:
The patent merges the printing function for both obverse and reverse surfaces into a single printing unit. The printing unit prints on the obverse surface of the sheet, then the sheet is reversed and printed again on the same printing unit for the reverse surface. This eliminates the need for separate printing units while maintaining printing quality.
Solution Approach 2:
The single printing unit is designed to perform multiple functions: printing on the obverse surface, and after sheet reversal, printing on the reverse surface. This multi-functional design allows one printing unit to replace what would traditionally require two separate printing units, thereby reducing apparatus size.
2Adaptability or versatility
If a sheet reversing mechanism is added to enable double-sided printing, then printing versatility is improved, but device complexity increases
Solution Approach 1:
The patent introduces a sheet reversing mechanism as an intermediary component between the single printing unit and the sheet conveyance system. This reversing mechanism includes reversing grippers that transfer the sheet from the printing unit, reverse its orientation, and return it to the printing unit for reverse surface printing, enabling double-sided printing capability without requiring completely separate printing units.
Data Source
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AI summary
This invention discloses a sheet processing apparatus including a sheet supply device, a first cylinder which includes at least one gripper device, a processing device, a sheet discharge device, and conveyance devices. The conveyance devices include a plurality of gripper devices including at least one reversing gripper device. The conveyance devices also include a second cylinder and reversing swing arm shaft pregripper. The second cylinder grips and conveys one edge of the sheet by one gripper device of the plurality of gripper devices. The reversing swing arm shaft pregripper is supported to be swingable between the first cylinder and the second cylinder, receives by the reversing gripper device the other edge of the sheet conveyed by the second cylinder, and transfers the received other edge of the sheet to the gripper device of the first cylinder by a gripping change.