Sheet Brake Eccentric Roller Friction Drive

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Solution Overview

Problem

Existing sheet braking systems face challenges in replacing worn-out brake bands without disassembling the drive roller, manual format adjustments, limited automation, and gear train wear due to dynamic loading, leading to inaccurate sheet stacking.

Innovation Solution

A sheet brake system with eccentrically offset roller axes and friction wheels, allowing for automated format adjustments and synchronous operation under dynamic loads, enabling easy replacement of brake elements and precise sheet tensioning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If brake bands wrap around the drive roller for direct frictional contact, then braking effectiveness is improved, but replacement of worn brake bands requires disassembly of the drive roller

Engineering Contradiction:

Improvebraking effectivenessVSAvoidbrake band replacement

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The drive roller is divided into a modular structure with a hollow interior space that can accommodate the brake bands. The brake bands are positioned inside the drive roller rather than wrapping around the exterior, allowing them to be accessed and replaced by simply removing the drive roller as a complete module rather than disassembling it. This segmentation of the drive roller into a replaceable hollow cylinder containing the brake bands resolves the contradiction between maintaining braking effectiveness and facilitating easy brake band replacement.

Inventive Principle:

Principle #1Segmentation

2Stability of the object's composition

If a common square shaft with gear trains drives all brake elements, then synchronized operation is achieved, but tooth play causes reverse play under dynamic loading

Engineering Contradiction:

Improvesynchronized operationVSAvoidgear train wear and backlash

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The gear train mechanism is replaced with a direct frictional contact drive system. Instead of using a square shaft with toothed gears to transmit rotational motion to the brake elements, the invention uses a drive roller that rotates within a hollow space and directly frictionally contacts the brake bands. This substitution eliminates the tooth play and backlash inherent in gear mechanisms while maintaining synchronized operation of all brake elements through the common rotational axis of the drive roller.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If brake elements are adjusted manually for format adaptation, then flexibility is achieved, but automation is difficult or impossible

Engineering Contradiction:

Improveformat adjustabilityVSAvoidformat adjustment automation

Core Design Contradiction:

Adaptability or versatilityVSExtent of automation

Solution Approach 1:

The brake elements are mounted on a movable carriage that can be dynamically adjusted along the longitudinal axis of the drive roller. The carriage is equipped with a motorized drive mechanism that enables automated positioning of the brake elements to accommodate different sheet formats. This dynamic adjustment system allows the brake elements to be automatically repositioned without manual intervention, resolving the contradiction between format adaptability and automation capability.

Inventive Principle:

Principle #15Dynamics

4Strength

If the drive roller is solid for structural strength, then mechanical strength is improved, but the hollow space needed for brake band accommodation is lost

Engineering Contradiction:

Improvedrive roller strengthVSAvoiddrive roller structure

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The brake bands are nested inside the hollow interior space of the drive roller, with the drive roller acting as a protective and structural housing. The drive roller is designed as a hollow cylinder with sufficient wall thickness to maintain structural strength while providing internal space for the brake bands. This nesting configuration allows the brake bands to be positioned within the drive roller structure, enabling easy access for replacement while maintaining the mechanical strength of the drive roller.

Inventive Principle:

Principle #7Nested doll (Nesting)

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

Enables easy replacement of brake elements without disassembling the drive roller, automated format adjustments, and synchronous operation under dynamic loads, ensuring accurate sheet stacking and reduced wear, thus improving the system's reliability and adaptability.

Implementation Method 1

the drive roller is drivingly connected to each braking band via direct frictional contact between the drive roller and the inner surface of the braking band

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentEP1882661B1Sheet braking system for braking printed sheets

Publication Date: 2012.12.26 HEIDELBERGER DRUCKMASCHINEN AG

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AI summary

The braking system has a set of brake units, where each rotates around a geometrical rotating axis (41-43). A common drive roller (9) for driving the brake units rotates around a geometrical roller axis (44). The drive roller is drive-technically connected with each brake unit by a friction contact of the drive roller. The roller axis is eccentrically displaced relative to one or each rotating axis of each brake units. The brake units are designed as endless brake bands (26) or belts.