Oscillating Arm Roller Guide for Elastic Member Stability
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Solution Overview
Problem
The existing methods for attaching a continuous body of an elastic member to a sheet in absorbent article manufacturing face instability issues due to large oscillation amplitudes, where the elastic member may fall off from the guide roller, especially when the motor is positioned below the spindle portion, obstructing the preferred supply route.
Innovation Solution
A manufacturing method and equipment that involves wrapping the sheet around a transporting roll and using an oscillating arm with oscillating end and spindle portion side rollers to guide the elastic member along the rotational central axis direction, allowing the elastic member to be fed through a communicating space in the spindle portion, ensuring stability by preventing the elastic member from falling off and allowing for easy supply route alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the guide roller is supported on a portion other than the oscillating arm, then the structure is simpler, but the elastic member may fall off when oscillation amplitude is large
Solution Approach 1:
The guide roller is integrated with the oscillating arm, merging the support function into the oscillating component itself. This ensures the guide roller moves synchronously with the oscillating arm, maintaining stable guidance of the elastic member even during large amplitude oscillations, thereby preventing the elastic member from falling off.
2Device complexity
If the motor is positioned below the spindle portion, then the driving mechanism is compact, but the supply route cannot be aligned along the rotational central axis
Solution Approach 1:
The guide roller is positioned above the spindle portion, utilizing the vertical dimension to resolve the spatial conflict between the motor location and the desired supply route alignment. This allows the elastic member to be supplied along the rotational central axis direction while the motor remains positioned below the spindle portion for compactness.
3Reliability
If the guide roller is positioned to support the elastic member stably, then travel stability improves, but the motor gets in the way and supply route alignment becomes difficult
Solution Approach 1:
The oscillating arm is divided into functional segments: the guide roller section for stable elastic member guidance, the spindle portion for rotational movement, and the motor section for power transmission. This segmentation allows each component to perform its function optimally without interfering with others, maintaining both travel stability and compact motor positioning.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A manufacturing method of a composite sheet of an absorbent article, the method includes joining a continuous body of an elastic member in a predetermined meander pattern in respect to a continuous body of a sheet transported continuously in a transporting direction, the method includes: transporting the continuous body of the sheet by wrapping the continuous body of the sheet around an outer circumferential face of a transporting roll that rotates in a direction along the transporting direction; and joining the continuous body of the elastic member to a portion of the continuous body of the sheet wrapped around the transporting roll by feeding the continuous body of the elastic member to the continuous body of the sheet via an oscillating arm that oscillates in an intersecting direction intersecting the transporting direction with a spindle portion as a swivel fulcrum, wherein the oscillating arm includes an oscillating end side roller arranged at an oscillating end side of the oscillating arm and a spindle portion side roller arranged at a spindle portion side, wherein in the joining, the continuous body of the elastic member supplied toward the spindle portion side roller through a supply route along a rotational central axis direction of the spindle portion is put around an outer circumferential face of the spindle portion side roller and an outer circumferential face of the oscillating end side roller successively and guided to the continuous body of the sheet, and a driving force to make the oscillating arm oscillate is input at a position on the oscillating arm different from the spindle portion.