Longitudinal Folding Apparatus Skew Correction via Sensor Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing longitudinal folding apparatuses face challenges in accurately folding products without manual intervention, particularly in maintaining optimal positioning and correcting skewed positions, which can lead to poor fold quality and increased risk of errors.
Innovation Solution
The implementation of a longitudinal folding apparatus with two transversely spaced measuring sites to detect the passage times of product edges, allowing for the determination of deviations from target times, and a control process that adjusts the retention force or friction between the product and braking elements to correct skew positions using sensor-controlled folding time regulation and motor-driven brush systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a longitudinal folding apparatus operates without manual intervention, then productivity increases, but manufacturing precision deteriorates due to skewed product positioning and poor fold quality
Solution Approach 1:
The patent implements sensor systems that detect product position and folding quality, feeding this information back to the control apparatus. The control apparatus automatically adjusts braking device pressure and folding blade timing based on sensor feedback, enabling high-speed automated operation while maintaining precise fold quality through continuous monitoring and correction.
Solution Approach 2:
The folding apparatus performs self-correction of skewed product positions through automatically controlled braking devices that apply differential friction to product edges. The system detects positioning errors and autonomously adjusts braking forces to realign products, eliminating the need for manual intervention while maintaining manufacturing precision.
2Manufacturing precision
If sensor systems and control processes are added to correct skewed positions, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical positioning mechanisms with a sensor-based detection system and electronic control system. Instead of using elaborate mechanical guides or alignment devices, the system uses optical or capacitive sensors to detect product position and electronically controls braking devices to correct skew, simplifying the overall system architecture while improving precision.
3Manufacturing precision
If braking devices are used to decelerate products, then manufacturing precision improves through better alignment, but object-generated harmful factors increase due to friction and potential product damage
Solution Approach 1:
The patent applies braking force selectively and partially - only to the extent needed for alignment, and only to specific regions of the product. The control apparatus modulates braking pressure to provide just enough friction for positioning correction without excessive force that could damage the product, particularly important for printed or coated surfaces.
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 enables higher output with reduced manual interventions while ensuring high fold quality, maintaining optimal positioning despite factors like belt wear, paper type, or ink application, and allows for automatic correction of skewed positions, thus improving the folding process's reliability and efficiency.
Implementation Method 1
The product is pressed into the gap between the folding rollers by a folding blade
Implementation Method 2
the product is decelerated from the first speed to the second speed via frictional contact exerted on the printed product
Implementation Method 3
a control process that adjusts the retention force or friction between the product and braking elements to correct skew positions
Data Source
AI summary
An inclined position of a product, leaving a nip between two folding rollers of a longitudinal folding machine, is corrected. The product is pressed into the nip between the rollers by a folding blade that can be moved up and down relative to a folding table. The product thus leaves the nip between the rollers and is transported in a direction of transport. The time of passage of a leading or a trailing edge of a product is detected at two measurement points which are spaced apart from each other and which are arranged transversely to the direction of transport of the product to be folded. Based on the times of passage that are detected by the two measurement points, and on commutation and/or data processing techniques, a deviation between a time offset detected during the passage of the corresponding product edge at the two measurement points, and a nominal time offset, is determined and analyzed. In the event that the deviation exceeds at least a tolerance range, a measure is initiated, by the use of a control device, in order to act against the deviation. The measure that is to be taken is based on retaining the product to a greater or lesser extent when the product is passing the folding rollers and/or in the provision of more or less friction between the braking elements and the product.