Band Saw Pressure Roller Segmentation for Wear Reduction
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Solution Overview
Problem
Existing band saw designs face challenges in extending the operational life of pressure members and maintaining safety due to noise generation and difficulty in synchronizing saw band guiding devices, especially when rotary shafts are horizontal, leading to premature wear and compactness issues.
Innovation Solution
The band saw incorporates rockably pivoted pressure member holders with pressure rollers or members that press the saw band's back surface, allowing for even load distribution and improved contact surface area, enabling the pressure members to withstand cutting loads and extend their operational life while maintaining a compact and safe design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a single pressure member is used to press the saw band back surface, then the structure is simple, but the operational life is short due to concentrated load and premature wear
Solution Approach 1:
The single pressure member is segmented into multiple pressure members (at least two) that are arranged to press different portions of the saw band back surface. This segmentation distributes the cutting load across multiple contact points, reducing wear on each individual pressure member and extending their operational life, while maintaining a relatively simple overall structure through the use of a common support mechanism
2Ease of operation
If the saw housing is slanted to accommodate vibrating means above the guide beam, then the vibrating mechanism can be disposed properly, but the total constitution becomes less compact and safety is reduced
Solution Approach 1:
The vibrating mechanism is repositioned from a vertical arrangement above the guide beam to a horizontal arrangement alongside the guide beam. This dimensional change allows the vibrating means to be properly disposed without requiring the saw housing to be slanted, thereby maintaining a compact and safe total constitution while still achieving the desired vibration function for noise suppression
3Strength
If pressure members are fixed in position, then the structure is simple, but they cannot withstand cutting loads effectively leading to premature wear
Solution Approach 1:
The pressure members are made movable along the saw band back surface rather than being fixed in position. This dynamic arrangement allows the pressure members to adjust their positions to maintain optimal contact with the saw band under varying cutting loads, effectively distributing the load and reducing wear. The movability is achieved through a simple support structure that guides the pressure members, balancing enhanced load-bearing capability with structural simplicity
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
The solution effectively disperses cutting loads across multiple pressure rollers or members, extending their operational life and enhancing the saw band's guiding efficiency, reducing noise, and improving the overall safety and compactness of the band saw.
Implementation Method 1
a plurality of pressure rollers...for pressing a back surface of the saw band
Implementation Method 2
a cam 33 of a proper shape...both the saw band guiding devices 19A,19B are those synchronously vibrated
Implementation Method 3
the aforementioned spline shaft 35 establishes spline fit on a spline sleeve 37
Data Source
AI summary
A band saw is includes a driving wheel and a driven wheel rotatably provided at a saw housing; an endless saw band made to run around the driving wheel and the driven wheel; and a plurality of saw band guiding devices for directing and guiding cutting edges of the saw band toward a direction of a workpiece to be cut. The saw band guiding devices are constructed to be movable in directions where one of the guiding devices gets closer to and away from another of the guiding devices, wherein each of the saw band guiding devices includes vibrating means for vibrating the saw band in a cutting direction relative to the workpiece. A pressure member holder including a plurality of pressure rollers or a pressure member for pressing a back surface of the saw band is provided in each of the saw band guiding devices.