Compact Printing Sheet Feeder for Offset Presses
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Solution Overview
Problem
Offset printing apparatuses face issues with large size, sheet detachment, and high manufacturing costs due to the long distance between the unwinder and rewinder, requiring complex control devices to maintain tension.
Innovation Solution
A compact printing apparatus design with an automatic printing sheet feeder that reduces the distance between the unwinding and rewinding rolls, eliminating the need for attachment devices to prevent sheet detachment and control tension, featuring a moving stage with feed and return rolls and a suction device for precise sheet handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the unwinder and rewinder are arranged in-line, then the printing sheet can be fed continuously, but the overall volume of the apparatus is increased and the distance between unwinder and rewinder becomes long
Solution Approach 1:
The patent transitions from a linear in-line arrangement to a compact spatial configuration where the unwinder and rewinder are positioned close together. The printing sheet path is routed through guide rolls and tension control mechanisms in a compact layout, effectively utilizing three-dimensional space rather than extending linearly, thus reducing overall apparatus volume while maintaining continuous feeding capability
2Productivity
If the distance between unwinder and rewinder is long, then continuous printing is enabled, but the printing sheet becomes detached and tension control becomes difficult
Solution Approach 1:
The patent introduces guide rolls and tension control devices as intermediary elements between the unwinder and rewinder. These intermediaries actively manage the printing sheet path, maintaining proper tension and preventing detachment through mechanical guidance and control mechanisms, thereby ensuring reliable continuous feeding
3Reliability
If control devices are installed to maintain tension, then sheet detachment is prevented, but manufacturing costs increase
Solution Approach 1:
The patent designs a tension control system that utilizes the natural tension generated by the compact unwinder-rewinder arrangement and the printing sheet feed mechanism itself. The guide rolls and existing mechanical components work together to maintain tension automatically, eliminating the need for additional active control devices and reducing manufacturing costs while maintaining reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces the overall size of the printing apparatus, minimizes sheet detachment risk, and lowers manufacturing costs, enhancing productivity and reliability by simplifying the design and maintaining consistent tension.
Implementation Method 1
an automatic printing sheet feeder (30) for continuously feeding a printing sheet (1) to a printing area (20a) of the moving stage (20) and for continuously collecting the printing sheet (1) from the printing area (20a)
Data Source
AI summary
A printing apparatus having an automatic printing sheet feeder integrated thereto to improve mass productivity. The printing apparatus includes a base, a moving stage, an automatic printing sheet feeder, and a printing roll. The moving stage is linearly movable along the base, and has a lithographic plate seated on the top surface thereof, the lithographic plate having a printing pattern thereon. The automatic printing sheet feeder is installed on the moving stage. The automatic printing sheet feeder includes an unwinding roll, which supplies the printing sheet, a rewinding roll, which collects the printing sheet, and a plurality of guide rolls, which guide the printing sheet to pass through the printing area of the moving stage. The printing roll is installed on the base, and performs printing by transferring ink from recesses of a printing pattern of the lithographic plate to the printing sheet on the moving stage.