Spreader Roll Bearing Pin Adjustment for Uniform Web Bending
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Solution Overview
Problem
Existing spreader roll apparatuses apply uneven bending moments to the roll tube due to thinner outer ends and lack precise control over bending direction and magnitude, leading to inefficient web width adjustment.
Innovation Solution
Bearing pins are journaled in pivotable inner bearings on the machine frame with radially acting adjusters that apply forces perpendicular to the roll tube's longitudinal axis, allowing for adjustable bending with self-aligning bearings and optional rotary drives, enabling precise control over bending direction and magnitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bearing pins are fitted to outer ends of the roll tube with tapered ends, then the roll tube can be bent, but the bending moment becomes uneven due to thinner outer ends
Solution Approach 1:
The bearing pin is divided into three functional segments: an inner bearing section journaled in the machine frame, a middle section extending into the roll tube, and an outer section with adjustment mechanism. This segmentation allows each part to perform its specific function - the inner bearing provides pivot support, the middle section transmits bending force uniformly to the roll tube, and the outer section enables precise angular adjustment, collectively resolving the bending moment uniformity issue.
Solution Approach 2:
The bearing pin acts as an intermediary element between the machine frame and the roll tube. It mediates the bending force application by being journaled in the frame at its inner end and extending into the roll tube at its middle section, ensuring uniform force distribution. The adjustment mechanism at the outer end allows precise control of this intermediary's position, thereby controlling the bending moment applied to the roll tube.
2Ease of operation
If bearing pins are fixed to the machine frame, then the roll tube can be bent, but precise control over bending direction and magnitude is lacking
Solution Approach 1:
The bearing pin is designed with dynamic adjustability - the outer end features an adjustment mechanism that allows the bearing pin's angular position to be changed during operation. This transforms the static bearing pin into a dynamic element that can adapt to different bending requirements, enabling precise control over bending direction and magnitude while maintaining operational flexibility.
Solution Approach 2:
The adjustment mechanism at the outer end of the bearing pin allows changing of geometric parameters - specifically the angular orientation of the bearing pin relative to the machine frame. By adjusting this parameter, the bending direction and magnitude applied to the roll tube can be precisely controlled, enabling flexible adaptation to different web spreading requirements without redesigning the entire system.
3Strength
If the roll tube has constant wall thickness, then structural integrity is maintained, but bending control is reduced
Solution Approach 1:
The bearing pin serves as an intermediary that decouples the structural integrity requirement from the bending control requirement. The constant wall thickness roll tube maintains its strength and rigidity, while the bearing pin - with its adjustment mechanism at the outer end - provides the necessary bending control. This intermediary allows the roll tube to remain structurally sound while enabling precise bending adjustment through the bearing pin's angular positioning.
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 solution ensures a uniform bending moment is applied to the roll tube, improving the spreader roll's efficiency in width-wise web spreading and allowing for precise angular adjustments, maintaining consistent bending during operation.
Implementation Method 1
The adjusters apply a force essentially perpendicular to the longitudinal axis of the respective bearing pins so the outer end of each bearing pin is deflected and bends the roll tube
Implementation Method 2
The pivoting bearing of the bearing pin is particularly useful when the bearing pin rotates with it, and it is a self-aligning bearing, preferably a multi-row ball bearing
Data Source
AI summary
The invention relates to a device, comprising: a spreader roll (2), the spreader roll having a roll tube (3), over which a material web is guided, the bending of the spreader roll (2) about its longitudinal axis allowing the material web to be spread out; and two bearing journals (4), which are operatively connected to the roll tube (3) and are pivotably articulated in a machine frame (1), the bearing journals (4) being mounted on the machine frame (1) by means of pivotable bearings (6) and the bearing journals having longitudinal pins (5) protruding beyond the bearings (6), at the ends of which longitudinal pins radially acting adjustment means (7) are positioned.