Sheet Guiding Device With Flexible Nozzle Cross Section
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Solution Overview
Problem
Existing sheet-guiding devices in sheet-processing machines, such as printing presses and diecutters, lack an efficient mechanism for modifying the nozzle cross section to adapt to varying operating parameters and material characteristics without requiring actuators.
Innovation Solution
A sheet-guiding device with a guide plate, a cover plate, and a flexible intermediate layer, where the nozzle cross section is adjusted automatically by operating pressure, and optionally controlled by an additional pressure, allowing for adjustable suction or blower performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed nozzle cross section is used in the guide plate, then the device structure is simple, but the suction or blower performance cannot be adapted to different operating parameters
Solution Approach 1:
The nozzle cross section is made dynamically adjustable through a flexible intermediate layer that can change its shape based on pressure differential. The flexible layer transitions from a rigid to a compliant state, allowing the nozzle opening to vary between a first cross-sectional area (when pressure differential is low) and a second cross-sectional area (when pressure differential is high), enabling adaptation to different operating parameters without complex mechanical actuators
Solution Approach 2:
The invention changes the physical state of the intermediate layer from rigid to flexible, allowing the nozzle cross-sectional area to be adjusted as a variable parameter. By changing the flexibility parameter of the intermediate layer, the system can adapt the suction or blower performance to match different material characteristics and machine speeds, transforming a fixed parameter system into a variable one
2Adaptability or versatility
If actuators are used to control the nozzle cross section, then the nozzle cross section can be adjusted, but the device complexity increases
Solution Approach 1:
The flexible intermediate layer serves itself by automatically adjusting the nozzle cross section in response to pressure differential changes. The system uses the existing pressure differential (caused by suction or blower operation) to directly control the flexible layer's deformation, eliminating the need for external actuators. The flexible layer acts as both a structural support and a control element, reducing device complexity while maintaining adaptability
Solution Approach 2:
The flexible intermediate layer acts as an intermediary element between the pressure field and the nozzle opening. Instead of using actuators to directly control the nozzle, the pressure differential mediates the control process by deforming the flexible layer, which in turn adjusts the nozzle cross section. This intermediary approach simplifies the control mechanism while achieving the desired adaptability
3Ease of manufacture
If the nozzle cross section is fixed, then the device is easier to manufacture, but cleaning efficiency is reduced
Solution Approach 1:
The nozzle cross section is made dynamically adjustable through a flexible intermediate layer that can change its shape based on pressure differential. The flexible layer transitions from a rigid to a compliant state, allowing the nozzle opening to vary between a first cross-sectional area (when pressure differential is low) and a second cross-sectional area (when pressure differential is high), enabling adaptation to different operating parameters without complex mechanical actuators
Solution Approach 2:
The invention changes the physical state of the intermediate layer from rigid to flexible, allowing the nozzle cross-sectional area to be adjusted as a variable parameter. By changing the flexibility parameter of the intermediate layer, the system can adapt the suction or blower performance to match different material characteristics and machine speeds, transforming a fixed parameter system into a variable one
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
Enables adaptation of suction or blower performance to different operating conditions without actuators, facilitating cleaning and independent control of nozzle cross section, enhancing operational flexibility and efficiency.
Implementation Method 1
a flexible intermediate layer (28) disposed between the guide plate (22) and the control plate (26) and having other passages (29) formed therein
Implementation Method 2
The passages (27) are commonly connected to a pressure chamber (31), which is in turn connected to a pressure generator (32)
Data Source
AI summary
A device for guiding sheets in a sheet-fed rotary printing press or diecutter includes a sheet-guiding plate with openings and a cover plate disposed parallel thereto and being displaceable by an applied operating pressure. A flexible intermediate layer disposed between the sheet-guiding plate and the cover plate has passages with a cross section which is variable by the operating pressure. A sheet brake, a diecutter and a printing press having the sheet guiding device are also provided.