Optical Joint Detection for Coated Profile Strip Cutting
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Solution Overview
Problem
Existing methods for separating coated profile strips fail to accurately align the cross-cut saw for precise cutting between abutting strips, resulting in significant waste due to the inability to precisely determine the joint between profile strips.
Innovation Solution
A device with a digital camera and lighting aligned at acute angles relative to the longitudinal conveyor, combined with a rotary encoder and measuring wheel, allows for accurate detection and alignment of the joint between profile strips, enabling precise cutting by controlling the cross-cut saw's carriage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cross-cut saw with spaced-apart blades is used to trim both sides of the joint, then miscuts are prevented, but significant waste is generated from the trimmed ends
Solution Approach 1:
The patent replaces the mechanical alignment system (physical positioning of the saw relative to the joint) with an optical measurement system (camera and lighting) that detects the joint position and communicates it to the control device. This substitution enables precise positioning without mechanical tolerances, allowing the saw to cut exactly at the joint without trimming waste.
Solution Approach 2:
The patent changes the positioning parameter from a mechanical tolerance-based system to an optically-measured position system. By using a camera to detect the joint and a rotary encoder to measure the strand feed, the system achieves sub-millimeter positioning accuracy, enabling the saw to be positioned exactly at the joint rather than using a fixed tolerance range that requires trimming.
2Productivity
If the cross-cut saw is controlled based on strand feed measurement, then continuous cutting is enabled, but the saw can only be aligned within a certain tolerance range relative to the joint
Solution Approach 1:
The patent introduces a feedback loop where the camera continuously detects the joint position, the rotary encoder measures the actual strand feed, and the control device adjusts the carriage position based on this feedback. This closed-loop control enables the saw to maintain precise alignment with the joint throughout continuous operation, overcoming the limitations of open-loop feed-based positioning.
Solution Approach 2:
The patent replaces the mechanical alignment system (relying on fixed tolerances and physical positioning) with an optical feedback system. The camera provides real-time visual feedback on joint position, which is processed by the control device to dynamically adjust the saw position, enabling precision much finer than mechanical tolerances would allow.
3Measurement precision
If lighting and camera are aligned at acute angles to the conveyor, then joint detection is enabled, but the system complexity increases
Solution Approach 1:
The patent uses acute-angle lighting and camera arrangement to create a shadow effect that highlights the joint between profile strips. By projecting light at an angle and capturing the shadow in the perpendicular camera dimension, the system converts a potentially complex multi-angle measurement problem into a simpler shadow-detection problem, reducing overall system complexity while maintaining high detection precision.
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 minimizes waste by ensuring the cross-cut saw accurately cuts through the joint between profile strips, reducing scrap and improving the efficiency of the separation process.
Implementation Method 1
lighting which is aligned at an acute angle to the longitudinal conveyor and a digital camera
Implementation Method 2
a rotary encoder which rolls on the strand and is connected to the control device as a measuring device for the strand feed
Implementation Method 3
a cross-cut saw with two spaced-apart saw blades on either side of the joint
Data Source
AI summary
The invention relates to a device for separating a strand (3), which is composed of profiled strips (4) butting against each other, according to said profiled strips (4), said strand being coated with a continuous film (5), the device comprising: a longitudinal conveyor (1), which holds the strand (3); a carriage (7), which has a chop saw (6) and can be moved synchronously with the strand (3) during the separating cut; a measuring apparatus for measuring the advancement of the strand; and a control apparatus (10), which controls the carriage drive (9) according to the advancement of the strand. For accurate separating cuts, it is proposed that an apparatus for detecting the butt joints between the individual profiled strips (4) is upstream of the chop saw (6) in the initial position of the carriage (7) within a strip length, that the apparatus for detecting butt joints comprises a lighting means (13) oriented at an acute angle (α) to the longitudinal carrier (1) and comprises a digital camera (14), the optical axis of which is inclined with respect to the longitudinal conveyor (1) oppositely to the lighting means (13), and that a rotary sensor (16), which rolls on the strand (3) and is connected to the control apparatus (10) as the measuring apparatus for measuring the advancement of the strand, can be controlled by means of an evaluation unit (15) of the digital camera (14).