Band Saw Hold-Down Belt Suction Mechanism

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Solution Overview

Problem

Conventional wood cutting band saw machines face inefficiencies due to slowed lumber movement caused by hold-down wheels and the accumulation of sawdust, which affects cutting efficiency and requires frequent cleaning.

Innovation Solution

The implementation of a hold-down belt roller set and endless hold-down belt driven by a dedicated motor, along with a conveyor belt system and sawdust discharge ports, ensures synchronized movement and efficient sawdust removal, preventing friction-induced speed loss and sawdust accumulation on the band saw blade and conveyor belt.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If hold-down wheels are used to clamp and restrict lumber movement, then lumber stability during cutting is improved, but lumber moving speed is slowed down

Engineering Contradiction:

Improvelumber stabilityVSAvoidlumber moving speed

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The patent replaces the mechanical friction-based hold-down wheels with a suction-based hold-down belt system. The hold-down belt is driven by a drive roller and creates negative pressure through suction holes to clamp the lumber, eliminating the friction resistance that slowed the lumber movement while maintaining effective clamping stability during cutting.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a pneumatic mechanism by using a vacuum generator to create negative pressure that drives the hold-down belt. The suction holes in the hold-down belt utilize this pneumatic force to generate clamping force on the lumber, replacing the purely mechanical friction-based hold-down wheel system and thereby improving lumber moving speed while maintaining stability.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Productivity

If conventional cutting operation is performed, then cutting function is achieved, but sawdust accumulates on band saw blade and conveyor belt requiring frequent cleaning

Engineering Contradiction:

Improvecutting efficiencyVSAvoidmaintenance frequency

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent extracts the sawdust removal function from the manual cleaning process and integrates it into the cutting system through dedicated discharge ports. The hold-down belt system with suction holes also serves to remove sawdust during operation, eliminating accumulation on the band saw blade and conveyor belt, thereby reducing maintenance frequency while maintaining cutting efficiency.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The hold-down belt serves multiple functions simultaneously: it provides clamping force to stabilize the lumber during cutting, drives the lumber forward through the suction mechanism, and removes sawdust through the suction holes. This multi-functionality eliminates sawdust accumulation without compromising cutting efficiency or requiring frequent cleaning.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If hold-down wheels create friction contact with lumber, then lumber is clamped and stabilized, but friction resistance reduces moving speed and affects cutting efficiency

Engineering Contradiction:

Improveclamping effectivenessVSAvoidcutting efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent substitutes the friction-based mechanical clamping mechanism with a suction-based pneumatic clamping system. The hold-down belt with suction holes creates clamping force through negative pressure generated by the vacuum generator, eliminating the friction resistance that reduced moving speed while maintaining reliable clamping effectiveness for stable cutting operations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 configuration enhances cutting efficiency by maintaining lumber stability and preventing sawdust accumulation, thereby improving the overall performance of the band saw machine by reducing friction-induced speed loss and ensuring continuous operation without interruptions for cleaning.

Implementation Method 1

a vacuum generator (65) connected to the hold-down belt (43) and operable for creating negative pressure to drive the endless hold-down belt (43)

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Implementation Method 2

the transport pulleys (32) and the hold-down belt rollers (42) are driven synchronously

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS11338465B2Band saw machine

Publication Date: 2022.05.24 BLUE STEEL MACHINERY

AI summary

A band saw machine is adapted for cutting a lumber, and includes frame body unit, a transport unit, a hold-down unit, a cutting unit and a drive unit. The transport unit includes an endless conveyor belt extending in a front-rear direction through the frame body unit for transporting the lumber. The hold-down unit includes an endless hold-down belt extending in the front-rear direction through the frame body unit. The endless conveyor belt and the endless hold-down belt are driven by the drive unit to rotate synchronously to carry the lumber to be cut by the cutting unit.