Transverse Removal Brake for Printed Sheet Positioning
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Solution Overview
Problem
Existing methods for decelerating and positioning printed sheets before folding operations often result in damage or misalignment due to sudden braking, which can lead to poor fold quality and mechanical wear in braking systems.
Innovation Solution
A method and device utilizing pneumatic braking forces, including air pulses and controlled friction, to precisely decelerate and position printed sheets, ensuring safe and accurate positioning without mechanical damage, and using a transverse pull-off brake to stabilize the sheet during folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a sheet stop is used to brake the printed sheet quickly, then the braking time is reduced, but the printed sheet is compressed or damaged at the stop area
Solution Approach 1:
The patent employs a pneumatic braking system where compressed air is directed through nozzles onto the printed sheet to create a braking force. This pneumatic approach replaces mechanical contact braking, eliminating compression damage while maintaining rapid deceleration capability. The air pressure and flow rate are controlled to achieve the desired braking effect without physical contact.
Solution Approach 2:
The invention substitutes the traditional mechanical sheet stop with a pneumatic braking field. Instead of relying on mechanical friction and contact forces that cause compression, the system uses controlled air jets to generate braking force, replacing the mechanical braking mechanism with a non-contact pneumatic field.
2Object-affected harmful factors
If brake brushes are used to slow down the printed sheet, then the braking force is distributed, but the brake brushes are subject to severe mechanical wear and require complex adjustment
Solution Approach 1:
The patent replaces mechanical brake brushes with a pneumatic braking system using controlled air jets. This eliminates the mechanical wear inherent in brush-based systems while maintaining distributed braking force through multiple nozzles arranged across the sheet width. The pneumatic system requires no mechanical adjustment and has no consumable parts.
Solution Approach 2:
The invention substitutes the mechanical brake brush system with a pneumatic field generated by air nozzles. This replacement eliminates the mechanical contact and associated wear, while the distributed arrangement of nozzles maintains the beneficial effect of distributed braking force across the sheet.
3Speed
If the printed sheet is braked suddenly to a stop, then the positioning speed is improved, but the sheet may jump back or twist leading to skewed folds
Solution Approach 1:
The pneumatic braking system applies force in controlled pulses or sequences rather than a single sudden stop. The air jets can be activated in stages or with varying intensity, allowing the sheet to decelerate smoothly while maintaining positional accuracy. This periodic or staged application of braking force prevents sudden stops that cause jumping or twisting.
Solution Approach 2:
The use of pneumatic pressure provides smooth, controllable deceleration without the abrupt mechanical stopping that causes sheet distortion. The compressible nature of air allows for gradual energy dissipation, preventing the sudden stops and rebounds that lead to misalignment and skewed folds.
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
The solution effectively prevents damage to printed sheets during deceleration and positioning, ensuring precise alignment and improved fold quality by using pneumatic and frictional forces to control the braking process, reducing mechanical wear and maintaining sheet integrity.
Implementation Method 1
a first means (110) operated with pneumatic braking force-triggering impulses (114) acting on the printed sheet (105)
Implementation Method 2
which exerts a frictional force effect on the printed sheet (105) along the infeed direction
Implementation Method 3
a transverse pull-off brake (117) which acts on the printed sheet (105) in a transverse direction with a transverse braking force
Data Source
Figure 1
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AI summary
The invention relates to a method for operating a device for applying force to a printed sheet during a folding operation, wherein the printed sheet is in a predetermined starting position prior to the folding operation. Braking impulses are directed onto the printed sheet to counteract the acceleration occurring in the initial phase of the folding operation and/or the fluttering movements occurring during the sheet's intake. These impulses act intermittently, uniformly, or oscillatingly on at least a portion of the printed sheet. The impulses are controlled by a control unit, which is operated with variable control profiles resulting from the queried operating parameters and/or by stored control profiles.