Sheet Transport Device Pneumatic Support Segments Cylinder Transfer
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Solution Overview
Problem
Existing sheet processing machines face challenges in dynamically and efficiently transferring sheets from guiding cylinders to conveying systems due to solid drums, high adjustment efforts, leakage issues with suction-based systems, and contamination of support elements, which lead to inefficiencies and maintenance problems, especially in high-speed operations.
Innovation Solution
A sheet transport device with a delivery drum and gripper carriages that use pneumatic support elements and suction cups with an ejector principle for vacuum generation, where support elements only contact the sheet and not the soiled cylinder surface, and the vacuum is generated locally to minimize leakage and wear, allowing for dynamic and efficient sheet transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid drums with support elements are used for sheet guidance, then sheet support is provided, but the drums are dynamically unfavorable and require considerable adjustment effort
Solution Approach 1:
The support drum is segmented into multiple individual support elements (rollers) that can be independently adjusted. Each roller can be positioned separately to contact the sheet at specific points, replacing a solid drum structure with discrete, adjustable components that reduce overall system complexity and adjustment effort.
Solution Approach 2:
The support elements are designed with adjustable positions along the drum circumference, allowing dynamic adaptation to different sheet formats and printing positions. This dynamic adjustability replaces the static solid drum structure, enabling rapid reconfiguration without considerable adjustment effort.
2Adaptability or versatility
If adjustable contact elements are assigned to sheet guide drums, then sheet support is improved, but the adjustment effort is considerable and not rationally feasible with rapid job changes
Solution Approach 1:
The support elements are designed to automatically adapt to the sheet format and printing position through self-adjusting mechanisms. The system performs its own adjustment function without requiring extensive manual intervention, enabling rapid job changes while maintaining versatile sheet support capability.
Solution Approach 2:
The support elements utilize simple parameter adjustments (positioning along the drum) rather than complex mechanical adjustments. This allows rapid reconfiguration for different job requirements by changing only the position parameter of the support rollers, significantly increasing job change speed while maintaining adaptability.
3Reliability
If suction discs with rotary valves are used to hold sheet edges, then sheet guidance is achieved, but leakage losses are high and wear is severe
Solution Approach 1:
The rotary valve component is extracted and removed from the system. Instead of using a rotary valve to control suction timing, the patent uses direct pneumatic actuation of the suction discs, eliminating the source of leakage losses and severe wear associated with rotary valve operation.
Solution Approach 2:
A pneumatic intermediary system is introduced to control the suction discs without mechanical contact. Pneumatic signals actuate the suction discs to engage and disengage from the sheet edges, replacing the rotary valve mechanism and eliminating leakage losses while maintaining reliable sheet guidance.
4Reliability
If suction discs with axial extension are used, then sheet edges are held, but pressure-free side margins are reduced and usable sheet area is reduced
Solution Approach 1:
The suction discs are designed with minimal axial extension, using thin pneumatic actuation elements instead of bulky mechanical structures. This allows the suction discs to hold sheet edges effectively while occupying minimal space, thereby maximizing the usable sheet area and reducing pressure-free side margins.
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 reduces energy consumption, minimizes maintenance needs, and enhances the dynamic behavior of sheet transfer by reducing leakage losses and wear, while maintaining a clean and efficient operation even at high speeds.
Implementation Method 1
A sheet transport device is proposed wherein the trailing edge of the sheet is held by a suction cup (10)
Implementation Method 2
pneumatic support elements and suction cups with an ejector principle for vacuum generation
Implementation Method 3
A sheet transport device with a delivery drum and gripper carriages that use pneumatic support elements
Data Source
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AI summary
The invention relates to a sheet-processing machine comprising: a sheet transport device having a sheet conveyor system (3, 4) receiving sheets from a sheet-guiding cylinder (2); a gripping device (3) for the clamped fixing and transporting of a front edge of a sheet; and at least two peripheral sheet support segments (6) simultaneously holding the sheet on the lateral cylinder surface of the sheet-guiding cylinder (2), wherein the sheet support segments (6) carry support elements (7) guiding the sheet exclusively supportingly or pressingly against the lateral cylinder surface, and pneumatic fixing devices (10) are provided for the sheet rear end. The aim of the invention is to provide an alternative sheet-processing machine comprising a sheet transport device and an alternative method for transporting sheets. In particular, the aim is to further improve the transfer of sheets from a sheet-guiding cylinder to a downstream sheet conveyor system. According to the invention, the problem is solved by displaceably mounting at least one sheet support segment (6) and a fixing device (10) together transversely to the sheet conveying direction (BFR).