Variable Folding System Using Linear Drives for Printing Machines

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Solution Overview

Problem

Existing folding systems in printing machines are inflexible, as they are designed with rotating cutting and folding cylinders that fix the folding format and section length, making it impossible to adjust during production or change variable section lengths without modifying system parts.

Innovation Solution

The system replaces rotating cylinders with linear drives and tool supports on cross tables, allowing for variable positioning and movement of cutting and folding tools, enabling flexible adjustment of section lengths and formats through synchronized and alternating tool engagement with the material web.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If rotating cutting and folding cylinders are used, then the folding format and section length are fixed, but the system lacks flexibility to adjust during production

Engineering Contradiction:

Improveflexibility to adjust folding formatVSAvoidsystem structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces static rotating cylinders with dynamic linear drive systems that can adjust tool positions in real-time. The cutting tool and folding tool are mounted on linear guides and driven by linear motors, allowing them to move dynamically along the web direction to accommodate variable section lengths and folding formats during production without changing the overall system structure.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent divides the folding system into independent functional modules: a cutting unit with a cutting tool, a folding unit with a folding tool, and separate linear drive systems. Each module can operate independently and be positioned at different locations along the web, enabling flexible combination to achieve various folding formats while maintaining manageable system complexity.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If rotating cylinders with fixed circumferential ratios are used, then the section length is determined by cylinder geometry, but variable section lengths require modifying system parts

Engineering Contradiction:

Improvevariable section length adjustmentVSAvoidsystem modification

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent changes the fundamental parameter of tool positioning from fixed circumferential geometry to variable linear displacement. The linear drives allow the cutting tool and folding tool to be positioned at any location along the web direction by adjusting drive parameters, enabling variable section lengths without modifying the physical system structure.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If cutting and folding tools are continuously engaged with the material web, then production efficiency is maintained, but web tears cannot be quickly responded to

Engineering Contradiction:

Improvemachine safetyVSAvoidproduction continuity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements periodic engagement and disengagement of the cutting and folding tools with the material web. The linear drives allow the tools to be quickly retracted from the web when tears or defects are detected, enabling rapid response while maintaining production continuity through controlled periodic operation rather than continuous engagement.

Inventive Principle:

Principle #19Periodic action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This setup allows for flexible adjustment of folding formats and section lengths during production, reduces waste, and enhances machine safety by enabling quick tool disengagement in case of web tears, while minimizing dynamic stresses and inertia forces.

Implementation Method 1

a cutting tool that can be brought into functional connection with the object web is provided, along with one or more transporting or conveying means... The transporting or conveying means comprise at least one carrier, which is embodied for engaging with and/or gripping the object web

Methodology Applied

Scientific EffectLinear motor: Linear Motor

Implementation Method 2

a folding element is pressed against the cut-off material section in the region of an intended folding line

Methodology Applied

Scientific EffectMechanical force: Mechanical Force

Data Source

PatentUS8960059B2Variable folding system comprising linear drives, especially for printing machines

Publication Date: 2015.02.24 BAUMULLER NURNBERG GMBH

AI summary

A method for producing individual material sections, particularly sheets of paper, according to a certain format, from a web-type, for example imprinted object (object web), more particularly a web of paper or material, using a cutting means for cutting off the individual material sections from the object web and then removing said sections from the cutting means, wherein during the course of actuation of the cutting means at least one carrier is engaged with the object web, wherein following the cutting process, the carrier is displaced, together with the object web gripped by said carrier, by means of a controllable linear drive, over a displacement stroke, which is adjusted and/or varied in a controlled manner by the linear drive according to a section format that is predefined for the material section.