Loin Puller Scribe Saw Assembly with Adjustable Ski and Load Pins

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Solution Overview

Problem

Conventional loin puller machines face issues with inconsistent cutting depth due to temperature variations, wear and damage from high RPM operation, side loads causing shaft misalignment and bolt loosening, and limited bearing contact leading to reduced component lifespan and safety hazards.

Innovation Solution

The improved loin puller scribe saw assembly features an adjustable ski for precise depth control, a double keyway on the pinion shaft for balanced pressure, needle bearings for increased contact area, load pins to transfer side loads, and a machined standard with double bearings for reduced wear and improved alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a mutable part system with a wheel is used to control scribe saw blade depth, then depth adjustment is possible, but cutting depth consistency deteriorates due to temperature variations causing the wheel to sink in or ride on top

Engineering Contradiction:

Improvedepth adjustment capabilityVSAvoidcutting depth consistency

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The ski is made adjustable and repositionable along the standard, allowing dynamic adaptation to different cutting depth requirements while maintaining consistent positioning through physical constraint rather than temperature-sensitive mutable parts

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The problematic mutable wheel system is removed entirely and replaced with a fixed or manually adjustable ski that provides stable, temperature-independent depth control through direct mechanical positioning

Inventive Principle:

Principle #2Taking out (Extraction)

2Device complexity

If a fixed ski is used on the scribe saw standard, then depth control is simplified, but blade life deteriorates due to limited sharpening capability

Engineering Contradiction:

Improvedepth control mechanism simplicityVSAvoidblade life

Core Design Contradiction:

Device complexityVSDuration of action of stationary object

Solution Approach 1:

The ski is designed to be adjustable and repositionable, allowing the blade to be sharpened at different positions along the standard, thereby extending blade life while maintaining simple depth control functionality

Inventive Principle:

Principle #15Dynamics

3Productivity

If the scribe saw blade operates at high RPM (2,000 RPM), then productivity increases, but reliability deteriorates due to wear damage and blade breakage

Engineering Contradiction:

Improvecutting speedVSAvoidblade durability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

Load pins are installed to absorb and redirect side loads before they can damage the blade or shaft, providing protective cushioning that enables high-speed operation while preventing wear and breakage

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

Load pins act as intermediary elements between the blade assembly and the shaft, transferring and distributing side loads to protect the critical rotating components from damage during high-speed operation

Inventive Principle:

Principle #24Intermediary (Mediator)

4Device complexity

If a single bearing is used in the pinion shaft assembly, then device complexity is reduced, but reliability deteriorates due to misalignment and excessive wear

Engineering Contradiction:

Improvebearing configurationVSAvoidshaft and gear alignment

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The single bearing is segmented into multiple bearings distributed along the shaft, providing multiple support points that maintain proper alignment and reduce wear while keeping the overall structure relatively simple

Inventive Principle:

Principle #1Segmentation

5Ease of manufacture

If a single keyway is used to connect pinion shaft to motor drive shaft, then manufacturing is simplified, but reliability deteriorates due to one-sided pressure causing shaft failure

Engineering Contradiction:

Improveshaft connection simplicityVSAvoidshaft strength

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The connection is changed from a single asymmetric keyway to a symmetric double keyway configuration, distributing pressure evenly on both sides of the shaft to prevent one-sided stress concentration while maintaining manufacturing simplicity

Inventive Principle:

Principle #4Asymmetry

6Device complexity

If mounting bolts are used to secure the scribe saw standard to the motor, then assembly is simplified, but reliability deteriorates due to side loads loosening bolts and causing them to be lost

Engineering Contradiction:

Improvemounting structureVSAvoidmounting bolt retention

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Load pins are introduced as intermediary elements to carry the side loads, protecting the mounting bolts from loosening forces while maintaining a relatively simple mounting structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10555538B2Loin puller scribe saw assembly

Publication Date: 2020.02.11 HALL FABRICATION INC

AI summary

A scribe saw assembly is provided for a loin puller and has substantially reduced wear and increased life of the assembly components. A pinion assembly includes a double keyway and opposing cutouts on the pinion shaft, with dual needle bearings. A bevel gear assembly includes pins for holding the scribe saw blade and dual bearings on the bevel gear shaft to eliminate shaft flex and blade wear. The standard is mounted to the motor housing with load bearing pins to prevent loosening of the mounting bolts. An adjustable ski is provided on the standard to control the cutting depth of the scribe saw blade.