Folding Device With Adjustable Blade Offset And Narrow Product Gaps
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Solution Overview
Problem
In folder systems, the existing designs face challenges in preventing damage to products during the transfer process due to the need for a wider gap between products to accommodate the movement of holding devices, which reduces productivity and requires a slower web feed speed, limiting efficiency, especially when processing shorter products.
Innovation Solution
The solution involves a folder design with a folding knife cylinder and a folding jaw cylinder where the holding devices of the jaw cylinder pass the transfer gap in the holding position, allowing for a narrower gap between products and enabling the use of a belt conveyor to accelerate products to the collecting cylinder's speed, while the movement of holding devices is controlled by a cam system with a cover disk to prevent damage and maintain productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wider gap is created between products on the collecting cylinder to accommodate gripper movement, then product damage during transfer is prevented, but productivity decreases due to slower web feed speed
Solution Approach 1:
Instead of having the jaw cylinder grippers pass through the transfer gap (which risks product damage), the patent inverts the timing so that jaw cylinder grippers remain in the holding position while the collecting cylinder grippers pass through the gap. This reverses the conventional approach and eliminates the collision risk.
Solution Approach 2:
The patent introduces dynamic control of the jaw cylinder grippers through a cam mechanism with a recess that allows the grippers to be held stationary in the transfer gap region, while normally they would move with the cylinder rotation. This dynamic positioning enables the narrow gap design.
2Adaptability or versatility
If the distance between grippers and folding knives on the collecting cylinder is increased to process longer products, then product length coverage is improved, but the gap between products must be wider reducing productivity
Solution Approach 1:
The patent makes the distance between grippers and folding knives dynamically adjustable through nested rotatable parts of the collecting cylinder, allowing optimization for different product lengths without requiring a fixed wide gap. Combined with the jaw cylinder gripper holding feature, this enables versatile product length handling while maintaining narrow gaps for high productivity.
3Productivity
If the circumferential speed of the collecting cylinder is increased to improve productivity, then web feed speed requirement is reduced, but centrifugal forces increase limiting further speed increases
Solution Approach 1:
The patent enables the collecting cylinder to operate at higher circumferential speeds by eliminating the need for wide product gaps through dynamic jaw cylinder gripper control. This increases the ratio of cylinder speed to web feed speed, improving productivity while staying within centrifugal force limits.
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 design prevents product damage during transfer, allows for a narrower gap between products, and increases productivity by enabling faster web feed speeds, particularly when processing shorter products, without disrupting the construction of the holding devices or folding jaws.
Implementation Method 1
A belt conveyor device for accelerating the products to the circumferential speed of the collecting cylinder is preferably arranged between the cutting mechanism and the collecting cylinder
Implementation Method 2
the movement of holding devices is controlled by a cam system with a cover disk to prevent damage and maintain productivity
Implementation Method 3
the part of the collecting cylinder that carries the folding knives is rigidly rotatably coupled to the jaw cylinder
Data Source
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AI summary
The invention relates to a folding device with a folding blade cylinder (11) and a folding jaws cylinder (16), wherein the folding jaws cylinder (16) and the folding blade cylinder (11) respectively have several circumferentially arranged holding devices (17; 12). The holding devices (17; 12) can be moved from a disengaged position for the uptake and release of the leading edge of a product to a holding position in which the leading edge is held in the holding device (17; 12). The folding jaws cylinder (16) additionally comprises a folding jaw (19) for each holding device (17) thereof, and the folding blade cylinder (11) comprises a folding blade (18) for each holding device (12) thereof for pressing the product which is held by the holding device (12) associated with the folding blade into one of the folding jaws (19) during the transit of said product through a transfer slot (14) between the folding blade cylinder (11) and the folding jaws cylinder (16). The offset between each folding blade (18) and the associated holding device (12) thereof on the folding blade cylinder (11) is adjustable. The offset between one of the holding devices (17) of the folding blade cylinder (16) and one of the folding blades (19) which follows behind said holding device (17) on the circumference of the folding blade cylinder (16) is fixed. The offset between one of the holding devices (17) of the folding blade cylinder (16) and one of the folding blades (19) which follows behind said holding device (17) on the circumference of the folding blade cylinder (16) is smaller than the maximum offset between one of the holding devices (12) on the circumference of the folding blade cylinder (11) and the folding blade (18) following behind said holding device (12).