Rotating Delivery Device for Absorbent Sheet Cutting
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Solution Overview
Problem
Conventional 90-degree drum rotating devices for manufacturing absorbent articles face issues with retaining performance at the end portions of cut-workpieces due to circular retaining surfaces, leading to curling and bending, and require complex configurations to avoid interference during the 90-degree turn.
Innovation Solution
A delivery device with a rotating body and workpiece retaining portions that turn around a circular orbit, allowing the retaining surface to protrude above the receiver during rotation, ensuring secure suction and avoiding interference, thus improving cutting and retaining performance without adding complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular retaining surface is used on the rotating drum, then the device structure is simple, but the retaining performance deteriorates at the end portions of cut-workpieces causing curling and bending
Solution Approach 1:
The retaining surface is divided into multiple suction holes distributed across the surface, creating segmented suction zones that provide uniform retention force across the entire workpiece including end portions, preventing curling and bending while maintaining structural simplicity
Solution Approach 2:
The retaining surface is designed with varying suction hole distributions - higher density at end portions and lower density at center areas - to provide localized retention strength where needed most, improving end portion retention without compromising overall device simplicity
2Device complexity
If the retaining surface is positioned at the outer circumferential face of the rotating drum, then the device configuration is simplified, but interference occurs during the 90-degree turn of retaining pads
Solution Approach 1:
The retaining pads are designed to rotate about an axis in the direction of radius of gyration, adding a rotational degree of freedom that allows them to clear the receiver path during the 90-degree turn, eliminating interference while keeping the overall device configuration simple
Solution Approach 2:
The retaining pads are made dynamically adjustable through rotation about the radius of gyration axis, allowing them to change their spatial position during operation to avoid interference with the receiver during the turning motion, rather than being fixed in a static position
3Manufacturing precision
If receivers are positioned close to the retaining surface for effective cutting, then cutting performance improves, but the retaining pads cannot be turned around without interfering with the receivers
Solution Approach 1:
The retaining pads rotate about an axis perpendicular to the drum rotation axis (in the radius of gyration direction), creating a three-dimensional motion path that allows them to arc over the receivers during turning, enabling both close receiver positioning for cutting and interference-free rotation
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
Enhances cutting performance and retaining efficiency of cut-workpieces by preventing curling and bending, while maintaining a simplified device configuration.
Implementation Method 1
a plurality of workpiece retaining portions 51 which are supported by the main rotating drum body 42 with retaining surfaces 53 for retaining by suction in a state facing the outer side in the direction of radius of gyration Dr
Data Source
AI summary
A transfer device equipped with a rotating body having multiple workpiece holding units that support a holding surface holding a continuous sheet member through suction that faces outward in the radial direction of the rotation body. Between adjacent workpiece holding units, arranged in the direction of rotation, the device is equipped with bed knives that produce single sheets by sandwiching and cutting the continuous sheet member in combination with a cutter member arranged to face the outer surface of the rotation body. The workpiece holding units pivot to follow the radial direction of rotation of the rotation body and modify the long direction face of the single sheets when the rotation of the rotation body takes the workpiece holding units past the position where the cutter member is arranged. At this time, the workpiece holding units are arranged so that part of the workpiece holding units passes over a bed knife.