Printing Mechanism Cylinder Shaft Clamping and Segmentation
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Solution Overview
Problem
The existing printing mechanisms in printing presses, particularly flexographic printing mechanisms, face challenges with inefficient disassembly and assembly of the cylinder shaft, large-stroke lifting operations, and complex structures that occupy significant space, leading to issues like inaccurate printing due to positional deviations and laborious maintenance processes.
Innovation Solution
A printing mechanism with a plate cylinder support device and transmission device that includes a rotating main shaft, clamping tightness transmission body, and clamping jaw units, allowing for independent disassembly and assembly of the cylinder shaft, optimized lifting operations, and a compact structure for color registration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a through-shaft structure is used for the cylinder shaft to extend completely through the cylinder and connect with the drive motor, then the transmission connection is achieved, but the disassembly and assembly of the cylinder shaft becomes difficult and time-consuming
Solution Approach 1:
The cylinder shaft is divided into multiple sections: a fixed end section that remains stationary, a movable middle section that can be extracted, and a driven end section. This segmentation allows the movable middle section to be independently removed for maintenance while the fixed end section maintains the transmission connection with the drive motor, resolving the contradiction between reliable transmission and ease of repair.
Solution Approach 2:
The movable middle section of the cylinder shaft is designed to be extractable from the cylinder. This extracted section can be separately maintained or replaced without affecting the overall transmission connection, enabling easy repair while maintaining reliable operation during printing.
2Productivity
If a replaceable printing plate sleeve is used with the through-shaft structure, then frequent disassembly and assembly of the cylinder shaft is avoided, but additional structures are added making the plate cylinder more complex and causing positional deviation
Solution Approach 1:
The printing plate cylinder is segmented into the cylinder body and the cylinder shaft, with the shaft further divided into fixed and movable sections. This segmentation allows the printing plate to be mounted on the cylinder body while the movable shaft section can be independently accessed for maintenance, eliminating the need for additional replaceable sleeve structures and reducing overall complexity.
3Ease of operation
If large-stroke lifting is used during plate change and temporary printing pause, then the plate cylinder can be disengaged and reengaged, but the support structure becomes insufficient and the operation is inefficient
Solution Approach 1:
The support frame is designed with dynamic lifting capabilities that can adapt to different operational requirements. During temporary printing pauses, only small-stroke lifting is needed to disengage the plate cylinder from the impression roller. During plate changes, the lifting mechanism can accommodate larger strokes. This dynamic adaptability improves both ease of operation and productivity by matching the lifting stroke to the specific operational need.
4Manufacturing precision
If structures for automatic centering and axial movement are provided, then color registration is ensured, but the structure occupies relatively large space
Solution Approach 1:
The automatic centering mechanism and axial movement mechanism are merged into an integrated support frame structure. The support frame simultaneously provides both centering functionality and axial adjustment capability through combined mechanical elements, reducing the overall space required compared to separate structures while maintaining color registration precision.
Solution Approach 2:
The support frame is designed as a multi-functional component that performs multiple functions: supporting the cylinder shaft, providing automatic centering, enabling axial movement for color registration, and facilitating lifting operations. This universality consolidates what would traditionally require separate structures into a single compact unit, maintaining precision while reducing space occupation.
Data Source
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AI summary
The present disclosure provides a printing mechanism of a printing press, including a plate cylinder support device and a plate cylinder transmission device, where a rotating main shaft of the plate cylinder transmission device is disposed on a support frame; a front end of the rotating main shaft is provided with a cylinder shaft clamping opening; separation clearances are formed between clamping jaw units at a periphery of the cylinder shaft clamping opening; an outer clamping transmission surface is disposed outside the clamping jaw units; a clamping tightness transmission body is provided with an inner clamping transmission surface; and the inner clamping transmission surface is disposed outside the outer clamping transmission surface for transmission. The cylinder shaft of the plate cylinder is not directly connected to a drive motor in a through-shaft form, the cylinder shaft of the plate cylinder can be disassembled and assembled independently, making the process more convenient and efficient. The cylinder shaft of the plate cylinder is clamped and released by the cylinder shaft clamping opening for disassembly and assembly. Clamping and expansion of the cylinder shaft clamping opening are achieved by operating the clamping tightness transmission body to actuate the clamping jaw units, which is practical and convenient. The present disclosure is more convenient for replacement and maintenance of the cylinder shaft of the plate cylinder, and is more advantageous for a usage scenario of the plate cylinder in which the cylinder and the cylinder shaft are of an integral structure.