Servo-Driven Strip Guide Arm for High-Speed Elastic Affixation

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Solution Overview

Problem

The challenge lies in accurately and efficiently affixing elastic strip material to a substrate material at high production speeds while minimizing waste and ensuring consistency, particularly in preventing the strip material from 'roping' or bunching, and maintaining consistent longitudinal strain during the affixation process in wearable articles like disposable diapers and adult incontinence garments.

Innovation Solution

A system comprising a servo motor-driven strip guide arm and joining mechanism that laterally shifts and compresses the strip material onto the substrate, utilizing a strain regulation mechanism with feed rollers to maintain consistent strain, thereby preventing roping and ensuring accurate placement and strain consistency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If hand manufacturing or limited machine-assisted techniques are used to affix elastic strip material to substrate material, then placement accuracy and strain consistency can be maintained, but production rate is too low for economically feasible production

Engineering Contradiction:

Improveproduction rateVSAvoidplacement accuracy and strain consistency

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The strip guide arm is made dynamically movable along the substrate material width via a servo motor, allowing the system to adapt to different placement locations while maintaining precision. This dynamic positioning capability enables high-speed production without sacrificing placement accuracy or strain consistency, as the arm can be precisely controlled to deliver the strip material to the exact required location on the substrate.

Inventive Principle:

Principle #15Dynamics

2Productivity

If strip material is laterally shifted rapidly to varying locations on moving substrate, then production speed increases, but strip material ropes (longitudinally folds or bunches) before entering joining mechanism

Engineering Contradiction:

Improveproduction speedVSAvoidstrip material flatness

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The strip material is pre-tensioned by the feed mechanism before lateral shifting occurs. This preliminary tensioning stabilizes the strip material, preventing it from roping or bunching during rapid lateral movement. The tensioned state ensures the strip remains flat and controllable throughout the lateral shifting process, enabling high-speed operation without compromising strip integrity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the tension parameter of the strip material during lateral shifting. By controlling the feed mechanism to maintain appropriate tension levels, the strip material remains stable and flat even during rapid positional changes. This parameter control prevents roping while enabling high-speed production.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If elastic strip material is longitudinally strained prior to affixation to achieve gathered appearance, then fit and comfort are improved, but strain variation occurs during lateral shifting causing inconsistent relaxation and gathering

Engineering Contradiction:

Improvegathered appearance consistencyVSAvoidstrain uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The feed mechanism incorporates feedback control to continuously monitor and adjust strip material tension during lateral shifting. This feedback system ensures that the longitudinal strain remains uniform regardless of positional changes, preventing strain variation that would lead to inconsistent relaxation and gathering. The result is reliable, consistent gathered appearance across all production cycles.

Inventive Principle:

Principle #23Feedback

4Productivity

If production rate is increased to 450 or more items per minute, then economic feasibility is achieved, but waste minimization and quality consistency become more difficult to maintain

Engineering Contradiction:

Improveproduction rateVSAvoidmaterial waste

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The system replaces manual or limited machine-assisted techniques with an automated servo motor-driven strip guide arm and feed mechanism. This mechanical automation enables precise control at high speeds, reducing material waste through accurate placement and minimizing defects that would require rework or scrap. The automated system maintains quality consistency while achieving the target production rate of 450+ items per minute.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS10059553B2System and method for high-speed continuous application of a strip material to a moving sheet-like substrate material

Publication Date: 2018.08.28 PROCTER & GAMBLE CO

AI summary

Disclosed are examples of a system for regulating the longitudinal strain in a longitudinal member being conveyed in a machine direction. The system may include a downstream mechanism that draws the longitudinal member in a machine direction, first and second control points upstream of the downstream mechanism, and a strain control mechanism disposed between the first and second control points. The strain control mechanism may include a strain motor with a drive shaft to which a travel path extension arm is coupled, and a travel path extension guide mounted on the travel path extension arm and in contact with the longitudinal member. The system may be configured and arranged such that rotation of the drive shaft effects rotation of the travel path extension arm and of the guide, thereby altering the distance of a travel path segment of the longitudinal member between the first and second control points.