Print Die Axial Alignment Assembly Using Expandable Force Rings
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Solution Overview
Problem
Existing mechanisms for mounting and axially aligning print rolls on journal or stub axles are excessively complex and prone to inaccuracies in alignment.
Innovation Solution
A mechanical assembly featuring a journal or stub axle with expandable force rings and drive sleeves, allowing for variable axial positioning and secure fixation of the print roll using jack screw actuators, enabling precise alignment and easy adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known mechanisms and assemblies are used for mounting and fixing a print roll upon a journal axle, then the print roll can be securely held, but the mechanism becomes excessively mechanically complex and cumbersome
Solution Approach 1:
The mounting mechanism is segmented into distinct functional components: expandable force rings that provide clamping force, drive sleeves that transmit actuation force, and jack screw actuators that provide the actuating motion. Each component has a specific function, replacing what was previously a single complex assembly with multiple simpler, specialized parts that work together.
Solution Approach 2:
The mechanism transitions from a static fixed mounting to a dynamic system that can easily change state between locked and unlocked positions. The expandable force rings can be compressed to engage with the print roll bore, creating a firm grip when needed, and can be decompressed to release the roll for repositioning. This dynamic capability is achieved through the jack screw actuators that control the compression state of the force rings.
2Reliability
If known mechanisms and assemblies are used for mounting and fixing a print roll upon a journal axle, then the print roll can be securely held, but inaccuracies in axial alignment of print rolls occur
Solution Approach 1:
The mechanism applies clamping force locally at multiple points around the print roll bore through the expandable force rings. Rather than applying force at a single location, the rings expand to contact the bore circumference, distributing the clamping force evenly. This localized multi-point contact prevents the print roll from shifting axially or radially, ensuring precise alignment while maintaining secure holding.
Solution Approach 2:
The jack screw actuators are positioned to apply compressive force to the drive sleeves, which in turn compress the expandable force rings against the print roll bore before the print roll is fully installed or immediately upon installation. This preliminary compression action secures the print roll in its desired axial position, preventing any subsequent movement or misalignment during operation.
3Ease of operation
If expandable force rings and drive sleeves are used for axial positioning and fixation, then precise axial alignment and easy adjustment are enabled, but the mechanism requires additional components
Solution Approach 1:
The expandable force rings serve multiple functions: they provide the clamping force to hold the print roll, they enable precise axial positioning through controlled expansion, and they facilitate easy adjustment by allowing the roll to be released and repositioned. The drive sleeves similarly serve dual functions of transmitting actuating force and providing structural support. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The jack screw actuators directly compress the drive sleeves, which in turn compress the expandable force rings, creating a self-contained actuation system. The mechanism uses its own structural components (drive sleeves and force rings) to transmit and apply the actuating force, rather than requiring separate transmission elements. This self-service approach simplifies the overall mechanism despite the presence of multiple components.
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
Facilitates precise axial alignment and secure locking of print rolls, reducing mechanical complexity and inaccuracies while allowing for easy sliding adjustments and repositioning.
Implementation Method 1
outwardly compressing the expandable force ring against the roll's hollow bore for resisting movement of the roll with respect to the axle
Implementation Method 2
securely axially fixes and alternatively releases the roll via easily accessed axially positioned jack screws actuators
Data Source
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AI summary
An assembly for axially aligning a print die, the assembly comprising an axle; at least a first expandable force ring receiving the axle; a roll having a circumferential outer surface and a hollow bore receiving the axle and the at least first expandable force ring; loading sleeves connected operatively to the axle for alternatively outwardly compressing the at least first expandable force ring against the roll's hollow bore, for resisting axial movement of the roll with respect to the axle, and for alternatively inwardly decompressing the at least first expandable force ring for permitting such axial movement; and print die mounting magnets fixedly attached to the roll's outer circumferential surface for attaching the print die to the roll.