Slitter Head Positioning for Wear Compensation

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Solution Overview

Problem

Conventional slitter devices experience wear in the thickness direction of their blades, leading to a shift in the cutting position as wear progresses, which affects the positioning accuracy of the slitter head.

Innovation Solution

The slitter device incorporates an upper rotary shaft and a lower rotary shaft with independently movable slitter heads, utilizing a control device to position one slitter head at a cutting position and the other at a pressing position, maintaining precise alignment and pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the blades are maintained in a pressed state to perform cutting, then the cutting function is achieved, but wear occurs in the thickness direction causing cutting position shift

Engineering Contradiction:

Improvecutting functionVSAvoidcutting position accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The slitter heads are made movable in the axial direction rather than fixed, allowing dynamic adjustment of their positions. The control device moves the slitter heads to compensate for wear, maintaining accurate cutting position while preserving the pressing function necessary for reliable cutting.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control device monitors the cutting process and adjusts the slitter head positions based on wear conditions. This feedback mechanism allows the system to detect position shifts due to wear and automatically correct them, maintaining cutting accuracy while keeping the blades in the necessary pressed state.

Inventive Principle:

Principle #23Feedback

2Manufacturing precision

If the slitter heads are positioned with high precision, then cutting position accuracy is improved, but the complexity of positioning mechanisms increases

Engineering Contradiction:

Improveslitter head positioning accuracyVSAvoidpositioning mechanism complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Rather than using complex fixed positioning mechanisms, the invention employs simple movable slitter heads that can be adjusted axially. This dynamic approach achieves high positioning accuracy through controlled movement rather than through complex mechanical constraints.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention replaces complex mechanical positioning systems with a control device that manages the positioning through coordinated movement of slitter heads. This substitution reduces mechanical complexity while maintaining or improving positioning accuracy through electronic control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12319023B2Slitter device, slitter-head positioning method, and box making machine

Publication Date: 2025.06.03 MITSUBISHI HEAVY IND MACHINERY SYST LTD

AI summary

A slitter device includes an upper rotary shaft and a lower rotary shaft that are supported so as to be able to rotate. An upper slitter head that is supported by the upper rotary shaft so as to be able to rotate therewith. A lower slitter head that is supported by the lower rotary shaft so as to be able to rotate therewith and that is disposed on one side of the upper slitter head in the axial direction of the lower rotary shaft. An upper movement device that can move the upper slitter head in the axial direction of the upper rotary shaft. A lower movement device can move the lower slitter head in the axial direction of the lower rotary shaft. A control device that controls movement of the upper movement device and the lower movement device.