Rubber Strip Winding Edge Alignment via Dynamic Speed Control
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Solution Overview
Problem
The conventional method for winding rubber strips onto tire forms faces issues with maintaining edge alignment due to rubber's flow and contraction, leading to unacceptable welds as the edges may not be in the desired positions, affecting tire performance.
Innovation Solution
A method where marks are placed on the rubber strip to identify the front and rear edges, and the winding process is synchronized to maintain equal speed for the marks initially, followed by varying speeds to compensate for length changes, ensuring the edges are correctly positioned for a strong weld.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the strip is made from rubber which flows easily and contracts after cutting, then the material is easy to process and conform to the form, but the length of the strip changes during the period between cutting and placement on the form, causing the front and rear edges to be in incorrect positions
Solution Approach 1:
The patent applies preliminary action by placing marks on the strip before winding, and by using a two-step synchronization method where the first step establishes initial alignment. The control system prepares compensation parameters in advance based on the angular position of the form and the position of the rear edge mark, preventing position errors before they occur rather than correcting them after winding.
Solution Approach 2:
The patent implements feedback by using sensors to detect the angular position of the form and the position of the rear edge mark during winding. The control system continuously monitors these parameters and adjusts the driving speeds of the strip and form in real-time based on the detected positions, ensuring that edge position accuracy is maintained despite rubber flow and contraction.
2Measurement precision
If marks are placed on the strip to identify front and rear edges, then edge identification is improved, but this only determines if a good-quality strip is obtained without overcoming the problem of obtaining an acceptable weld after each winding operation
Solution Approach 1:
The patent uses the marks as feedback references. The control system detects the position of the rear edge mark and uses this information to adjust the winding process. The marks are not just for identification but serve as active feedback elements that guide the synchronization and speed variation steps to ensure acceptable weld quality after each winding operation.
Solution Approach 2:
The patent changes the driving parameters (speeds of strip and form) based on the detected positions of the marks. During the second step, the control system varies the speeds to compensate for length variations, ensuring that the marks end up in the correct positions for reliable welding. This dynamic parameter adjustment transforms the static mark identification into an active control mechanism.
3Adaptability or versatility
If the strip length is allowed to vary due to rubber flow, then the material naturally conforms to the form, but the front and rear edges are not in the desired positions once wound
Solution Approach 1:
The patent applies dynamics by implementing a two-step winding process with varying speed relationships. The first step uses synchronized speeds for initial positioning, while the second step uses varied speeds to compensate for length variations. This dynamic speed adjustment allows the rubber to flow and conform to the form while simultaneously ensuring that the edges reach their desired positions for proper alignment and welding.
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 method ensures the front and rear edges are accurately aligned, preventing open, overlapping, or thickness differences, resulting in a consistent and high-quality weld during each winding operation.
Implementation Method 1
since the strip is made from rubber which is a material which flows easily and which in particular contracts after it has been cut
Data Source
AI summary
A method for winding a rubber strip onto a form of revolution includes steps of: forming a strip of predetermined length, applying front and rear edge marks to the strip, driving the strip towards the form, arranging a front edge of the strip on the form, and driving the form to wind the strip onto the form. In a first phase, the driving of the strip and the driving of the form are synchronized so as not to modify the length of the strip. In a second phase, the driving of the strip and the driving of the form are controlled depending on an angular position of the form and on a position of the rear edge mark, in order to vary relatively a displacement speed of the rear edge mark and a displacement speed of the front edge mark, to compensate for variations in the length of the strip.