Fluid-Operated Double Gearwheel Unlocking Mechanism
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Solution Overview
Problem
Existing sheet-fed rotary printing press devices for switching between recto and verso printing require complex and heavy clamping mechanisms that are space-demanding and can cause displacement of gears during unlocking, leading to inefficiencies and potential damage.
Innovation Solution
A non-contact unlocking mechanism using a circular lifting channel with concentric rings, driven by fluidically generated energy, which supports the clamping force within the double gear wheel, allowing for safe and gentle release without axial forces, maintaining the gear wheel's position and reducing maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-loaded clamping mechanism with pneumatic piston or bellows is used to release the clamping, then the clamping force can be applied and released, but axial forces are applied to the cylinder bearings during release, leading to displacement of the entire cylinder and gears
Solution Approach 1:
A guide body is introduced as an intermediary element between the lifting mechanism and the gear. The guide body receives the lifting force from the annular lifting mechanism and translates it into controlled movement, preventing direct transmission of axial forces to the gear and cylinder bearings. This mediator ensures that the clamping release function is achieved without compromising gear position accuracy.
Solution Approach 2:
The traditional spring-loaded clamping mechanism with pneumatic piston is replaced by a fluidically operated lifting mechanism (hydraulic or pneumatic cylinder) that acts vertically on the guide body. This substitution eliminates the complex spring-bellows-piston arrangement and its associated axial force problems, providing a more reliable and precise clamping release system.
2Force
If single-arm cranked levers mounted on ball bearings are used to generate clamping force, then the clamping force can be applied through pivoting movement, but the mechanism becomes complex and requires multiple mechanical auxiliary elements
Solution Approach 1:
The complex single-arm cranked lever mechanism with ball bearings is completely removed from the system. Instead, a simplified force application method is used where fluid pressure directly acts on a piston that moves a guide body, which in turn controls the clamping elements. This extraction of the unnecessary mechanical complexity maintains the required clamping force while dramatically reducing the number of moving parts and mechanical auxiliary elements.
Solution Approach 2:
The mechanical lever system is replaced by a hydraulic or pneumatic cylinder that generates the necessary force through fluid pressure. This allows the clamping force to be applied and released on demand without complex mechanical linkages, reducing device complexity while maintaining or improving the reliability of the clamping function.
3Ease of operation
If the guide body is mounted on a rod centered on the main gear with axial displacement capability, then the lifting mechanism can function, but the rod is subjected to outward pressure by compression spring and requires precise alignment
Solution Approach 1:
The guide body serves as an intermediary that is subjected to vertical lifting forces from the annular lifting mechanism. It translates these forces into controlled movement while preventing the transmission of misalignment stresses to the rod and gear. This mediator allows the lifting mechanism to operate effectively without requiring extremely precise rod alignment, as the guide body absorbs and directs the forces appropriately.
4Volume of moving object
If clamping elements are rigidly mounted to the cylinder and run continuously throughout operation, then the design is compact, but the mechanism becomes heavy and complicated with limited automation capability
Solution Approach 1:
The clamping mechanism transitions from a static, continuously engaged design to a dynamic system that can be actively controlled. The annular lifting mechanism with fluid pressure control allows the clamping elements to be engaged or disengaged as needed, enabling automated operation. This dynamic approach maintains compactness while dramatically improving automation capability, as the system can respond to control signals to adjust the clamping state.
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 enables efficient and compact unlocking of the double gear clamp with minimal effort, preventing gear displacement and maintaining drive accuracy, thus enhancing the operational reliability and reducing maintenance requirements.
Implementation Method 1
an annular, fluid-operated lifting mechanism (40, 41) for releasing the connection
Data Source
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AI summary
The aim of the invention is to simplify a device for releasing the clamping of a double gearwheel in a sheet-fed rotary printing press for face printing or face printing and reverse printing. To this end, an annular piston (41) is arranged in an annular cylinder (40) coaxially with respect to an axial bearing (33) on the cylinder pin (10) of a printing unit cylinder of the sheet-fed rotary printing press.