Rewinding Machine Mechanical Core Fastening

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Solution Overview

Problem

Existing rewinding machines for producing logs of web material, such as tissue paper, require complex and costly components like glue dispensers, suction systems, and electrostatic charges for fastening the initial edge of the web material to the winding core, leading to increased costs, maintenance needs, and adhesion issues with the core.

Innovation Solution

A method utilizing a movable mechanical member to draw the initial free edge of the web material towards the winding core, eliminating the need for glue, suction, electrostatic charges, or compressed air jets by synchronizing the core's movement with the mechanical member's action to form the first turn of the new log.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If glue is used to fasten the initial edge of web material to the winding core, then the web material adheres to the core, but the machine structure becomes complex and costly, and frequent cleaning and maintenance are required

Engineering Contradiction:

Improveadhesion of web material to coreVSAvoidcomplexity of glue dispenser system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent removes the glue dispenser system entirely from the rewinding machine. Instead of using glue to fasten the initial edge of web material to the winding core, the invention employs a mechanical member that physically guides and presses the web material onto the core, eliminating the need for adhesive systems and their associated complexity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the chemical adhesion system (glue) with a mechanical system. A movable mechanical member with a pressing surface is used to physically press the web material against the winding core, substituting chemical bonding with mechanical force and friction-based adhesion

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If suction systems are used to attract and adhere web material to the winding core, then the web material fastens to the core, but the device complexity increases and power consumption rises

Engineering Contradiction:

Improvefastening of web material to coreVSAvoidcomplexity of suction system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent removes the suction system components (vacuum pumps, suction holes, sealing mechanisms) from the winding core assembly. The mechanical member approach eliminates the need for creating and maintaining vacuum pressure, thereby removing the entire suction infrastructure

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the pneumatic suction system with a mechanical pressing system. The movable mechanical member uses direct contact and friction forces to secure the web material to the core, substituting pressure-based adhesion with mechanical force-based adhesion

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If electrostatic charges are used to attract the initial free edge of web material to the winding core, then the first turn forms, but the device complexity increases and the system is difficult to control

Engineering Contradiction:

Improveformation of first turnVSAvoidcomplexity of electrostatic charging system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent removes electrostatic charging components (charge generators, electrode systems, control circuits) from the winding mechanism. The mechanical member approach eliminates the need for generating and controlling electrostatic fields

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the electrostatic field-based attraction system with a mechanical contact-based system. The movable mechanical member physically guides and presses the web material onto the core using mechanical force, substituting field-based attraction with direct mechanical interaction

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Ease of operation

If compressed air jets are used to facilitate the start of winding, then the first turn forms more easily, but the device complexity increases and material is consumed

Engineering Contradiction:

Improveease of forming first turnVSAvoidcomplexity of compressed air nozzle system

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent removes compressed air nozzle components from the winding mechanism. The mechanical member approach eliminates the need for compressed air supply systems, nozzles, and pressure control mechanisms

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the pneumatic jet system with a mechanical pressing system. The movable mechanical member uses direct mechanical contact and friction to facilitate the formation of the first turn, substituting air flow-based assistance with mechanical force-based assistance

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS7931226B2Method and machine for forming logs of web material, with a mechanical device for forming the initial turn of the logs

Publication Date: 2011.04.26 FABIO PERINI SPA

AI summary

The rewinding machine includes a winding unit; a feed path of a web material; a separator device to sever the web material upon completion of winding each log; an insertion path of the winding cores towards the winding unit; a movable mechanical member to facilitate forming a first turn of web material around each winding core inserted in the insertion path.