Movable Plate Securing Members for Printing Cylinder Positioning
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Solution Overview
Problem
Existing plate attachment devices face challenges in simultaneously improving the circumferential positioning accuracy of printing plates relative to plate cylinders and the operability of attaching and detaching the plates, with larger plate diameters compromising accuracy and smaller diameters affecting operability, leading to issues like misalignment and printing defects.
Innovation Solution
A plate attachment device with movable plate securing members that adjust the circumferential length of the plate cylinder, featuring curved contact surfaces and symmetrical arrangement for balanced weight, allowing for easy attachment and detachment while maintaining positional accuracy and preventing deformation and misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the diameter of the cylindrical printing plate is made closer to the diameter of the plate cylinder, then the circumferential positioning accuracy of the printing plate relative to the plate cylinder is improved, but the operability of attaching and detaching the printing plate deteriorates
Solution Approach 1:
The plate securing members are designed to be movable between a first position (radially outward) for securing the printing plate and a second position (radially inward) for releasing it. This dynamic positioning allows the plate cylinder's effective circumferential length to be adjusted: shorter when securing members are inward (facilitating plate attachment/detachment), and longer when securing members are outward (improving positioning accuracy during printing).
Solution Approach 2:
The invention changes the parameter of the plate cylinder's circumferential length by moving the plate securing members between two radial positions. When the securing members are in the radially inward position, the effective circumferential length is shorter, creating a gap that facilitates plate attachment and detachment. When moved to the radially outward position, the effective circumferential length increases, improving the contact between the printing plate and plate cylinder for accurate positioning during printing.
2Ease of operation
If the diameter of the cylindrical printing plate is made larger than the diameter of the plate cylinder, then the operability of attaching and detaching the printing plate is improved, but the circumferential positional accuracy of the printing plate relative to the plate cylinder deteriorates
Solution Approach 1:
The movable plate securing members enable the system to dynamically adjust between two operational states: a plate attachment state (securing members inward) that prioritizes ease of operation, and a printing state (securing members outward) that prioritizes positioning accuracy. This eliminates the need to choose a fixed plate diameter that compromises either parameter.
Solution Approach 2:
The plate securing members are segmented from the main plate cylinder structure, allowing independent movement between radial positions. This segmentation enables the securing members to create or eliminate gaps between the printing plate and plate cylinder as needed, facilitating both easy plate attachment/detachment and accurate positioning during printing.
3Ease of operation
If a part of the outer periphery of the plate cylinder is cut out into a flat surface to create a gap, then the attaching and detaching operability can be improved, but printing defects such as misalignment of images occur when the cutting corresponds to the printing surface
Solution Approach 1:
Instead of a static flat surface cutout, the invention uses movable plate securing members that can be positioned radially inward only when needed for plate attachment and detachment. During printing, the securing members are positioned radially outward, restoring the cylindrical surface and ensuring proper printing alignment. This dynamic approach eliminates the permanent compromise to printing accuracy that results from static cutouts.
Solution Approach 2:
The gap-creating function is extracted from the plate cylinder's fixed structure and assigned to movable plate securing members. This allows the gap to be created temporarily only when needed for plate attachment/detachment, rather than being a permanent feature that would compromise printing alignment. The securing members can be moved inward to create the gap, then moved outward to restore the printing surface integrity.
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(e)
AI summary
A plate attachment device and a method for attaching and removing printing plates, wherein the positioning accuracy in the circumferential direction relative to a plate cylinder is increased and attachment and removal of the printing plate is easy, are provided. The plate attachment device 1 is equipped with a plate cylinder 11 secured to the outer periphery of a plate drive shaft 31 and having a cylindrical plate attaching surface 12 to which a printing plate 2 is to be attached from the tip end side of the plate drive shaft 31. The plate attaching surface 12 is provided with a plurality of plate securing members 121 which are formed to be movable to both the outer side and inner side in the radial direction of the plate cylinder 11, abut the printing plate 2 attached to the plate attaching surface 12 and expand in the radial direction so as to adhere and secure the printing plate 2 to the plate attaching surface 12.