Variable-Speed Pad Feeding for Wider Wearable Article Pitch
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Solution Overview
Problem
Existing manufacturing methods for wearing items face challenges in increasing the distance between neighboring workpieces without enlarging the rotary drum diameter, as constant feeding and rotation speeds lead to a short acceleration zone and insufficient pitch expansion.
Innovation Solution
A method and device that adjust the feeding speed of a workpiece continuous body to match the rotation speed of pads, allowing pads to rotate at non-constant speeds and change relative speeds to expand the distance between workpieces, using a feeder that adjusts speed in response to pad speed changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the feeding speed of the workpiece continuous body is kept constant, then the pads can rotate at constant speed, but the acceleration zone of pads becomes short and the distance between neighboring workpieces cannot be sufficiently increased
Solution Approach 1:
The patent applies dynamics by making the feeding speed variable rather than constant. The feeding speed is adjusted to match the rotation speed of the pads, which itself varies during the rotation cycle. This dynamic speed adjustment allows the system to achieve sufficient acceleration zone length while maintaining proper synchronization between the continuous body feed and pad rotation, thereby increasing the distance between neighboring workpieces.
Solution Approach 2:
The patent changes the speed parameter from constant to variable. Specifically, the feeding speed is modified to correspond to the varying rotation speed of the pads throughout their rotation cycle. This parameter change enables the pads to have an extended acceleration zone, which directly increases the distance between neighboring workpieces while maintaining proper material feed synchronization.
2Stability of the object's composition
If the zone of constant speed is made long, then the pads can maintain stable rotation, but the acceleration zone becomes short and the drum diameter must be increased
Solution Approach 1:
The patent resolves this contradiction by implementing dynamic speed adjustment where the feeding speed varies in sync with the pad rotation speed. This allows the system to maintain adequate acceleration zones for pitch expansion without requiring an increased drum diameter, while still providing sufficient zones for stable rotation and cutting operations.
Solution Approach 2:
The patent changes the feeding speed parameter from constant to variable, matching it to the pad rotation speed profile. This parameter change allows optimization of both acceleration and constant speed zones within the existing drum diameter, maintaining rotation stability while achieving sufficient workpiece pitch expansion without structural modifications.
3Length of moving object
If the pads rotate at non-constant speed to expand pitch, then larger distances between workpieces are achieved, but speed synchronization with the feeder becomes complex
Solution Approach 1:
The patent implements feedback control where the feeding speed is adjusted based on the actual rotation speed of the pads. The system monitors the pad rotation speed and uses this information to dynamically adjust the feeding speed, ensuring synchronization is maintained throughout the variable speed cycle. This feedback mechanism simplifies the overall control by using the pad speed itself as the reference for feeder speed adjustment.
Solution Approach 2:
The patent makes the feeding system multi-functional by enabling it to operate under both constant and variable speed conditions. The same feeding mechanism handles both the acceleration phase (with variable speed for pitch expansion) and the constant speed phase (for stable cutting and transfer), eliminating the need for separate control systems and reducing overall device complexity.
Data Source
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Figure 3A~3B
AI summary
A manufacturing method for a wearing item repeatedly executes: a step of, at a preceding pad, receiving and holding a distal end part of a continuous body to convey; a step of, at a following pad, catching up with the preceding pad; a both holding step of, at both of the preceding pad and the following pad, holding the continuous body; and a cutting step of cutting the distal end part of the continuous body to generate an individual workpiece on the preceding pad, and, in the both holding step, relative speeds of both of the pads are equal to each other, and both of the pads rotate at a non-constant speed in at least part of a zone, the continuous body is fed from the feeder at the non-constant speed in response to a change in a speed of the pads that rotate at the non-constant speed.