Segmented Drum Channel for Tension-Free Creasing Ring Mounting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing creasing devices require stretching resilient rings beyond their working diameter to mount them, leading to reduced tension, unreliable creasing, and the need for time-consuming shaft removal for ring replacement, which shortens the ring's lifespan.
Innovation Solution
The drum is designed in two parts with a recessed channel that allows the resilient creasing ring to be assembled without stretching, ensuring secure retention without tension and enabling easy replacement without dismounting the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the resilient ring is stretched beyond its working diameter to pass over the drum outer surface, then the ring can be mounted in the groove, but the ring tension is reduced and the ring may lengthen permanently
Solution Approach 1:
The drum is divided into two separate drum parts that can be assembled independently. The resilient ring is mounted in the groove formed by these two parts without being stretched, as the ring is compressed radially inward by the groove walls rather than being expanded over the drum surface.
Solution Approach 2:
Instead of expanding the resilient ring beyond its working diameter to mount it on the drum, the invention inverts the approach by having the drum groove compress the ring radially inward. The ring is mounted at its working diameter and held in place by radial compression from the groove walls.
2Adaptability or versatility
If the resilient ring is repeatedly stretched during its lifetime, then the ring can be remounted, but the ring lifetime is shortened
Solution Approach 1:
The drum is segmented into two parts that can be removed independently. This allows the resilient ring to be accessed and replaced without stretching, as the drum parts can be taken apart and reassembled around the ring at its working diameter.
Solution Approach 2:
The resilient ring is extracted from the stretching process entirely. The ring is mounted in the groove without being expanded and is never subjected to tensile stress during installation or replacement, eliminating the cumulative damage that would shorten its lifetime.
3Ease of repair
If the shaft is removed from the machine to replace the resilient ring, then the ring can be replaced, but the machine operation is interrupted
Solution Approach 1:
The drum is divided into two separable parts that can be independently removed from the shaft. This allows the resilient ring to be accessed and replaced by removing only the drum parts, not the entire shaft assembly, minimizing machine downtime.
Solution Approach 2:
The drum parts are designed to be dynamically removable and reattachable to the shaft during machine operation. The parts can be quickly detached, the ring replaced, and the parts resecured without removing the shaft from the machine.
4Ease of operation
If the resilient ring is loosely held in the groove, then the ring can be easily removed, but creasing becomes unreliable and the ring is continuously deformed
Solution Approach 1:
The groove has different local qualities: the radial walls provide strong compression to hold the ring tightly for reliable creasing, while the axial ends of the groove allow the ring to be easily pushed out for replacement. This local differentiation of retention and removal characteristics solves the contradiction.
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
This design maintains ring tension, enhances creasing reliability, and allows for effortless ring replacement without interrupting machine operations, extending the ring's lifespan and improving overall creasing efficiency.
Implementation Method 1
a resilient creasing ring that projects from the channel in use presses a sheet of stock fed between the rotating drums into the groove of the other drum to form a crease
Data Source
Figure 1~2
Figure 3a~3f
AI summary
A drum (2) for mounting the resilient creasing ring (8) of a creasing device is formed in two parts (14, 15), each having a cylindrical outer surface (12) and a bore for mounting the drum part about a shaft (4). The first and second drum parts (14, 15) are shaped such that they may abut one another to define between them the base (18) and two side walls (20, 21) of a channel (6) for receiving the resilient creasing ring (8). At least one side wall (20, 21) of the channel (6) is recessed so that a resilient creasing ring (8) located in the channel (6) and projecting laterally into the recess cannot be withdrawn radially from the channel (6). As a result, it is no longer required that the ring (8) be under tension to hold it in place so a split ring (8) can be used and replacement rings can be added to the device without removing the shaft (4) from the machine in which it is mounted.