Sheet Delivery Device Holding Mechanism for High-Speed Pile Formation
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Solution Overview
Problem
Existing sheet-processing machines face challenges in ensuring trouble-free operation and high-quality delivery of substrate sheets, particularly at high speeds, due to issues like sheets being carried away by air flows or striking adjacent guiding elements before the pile is fully formed.
Innovation Solution
A delivery device with a holding device to prevent the topmost sheet from being lifted off, combined with a vertically movable sheet guiding element that can be adjusted using an actuating drive, ensuring the smooth transfer and prevention of sheet damage during high-speed operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sheets are conveyed at high speed through the delivery system, then productivity is improved, but sheets may be carried away by air flows or strike adjacent guiding elements causing malfunctions
Solution Approach 1:
The holding device applies a preliminary counteracting force to prevent the harmful effect before it occurs. By holding the topmost sheet down with holding means (suction cups, weights, or mechanical clamps) before the sheet can be carried away by air flows or strike guiding elements, the system prevents malfunctions while maintaining high conveying speeds.
Solution Approach 2:
The holding device acts as an intermediary between the high-speed conveying system and the vulnerable topmost sheet. This intermediate holding mechanism buffers the sheet during critical moments, allowing high-speed operation without directly transmitting the harmful effects to the sheet.
2Device complexity
If a fixed sheet guiding element is used, then device complexity is reduced, but the sheet may strike the guiding element when the pile is at low height causing damage
Solution Approach 1:
The sheet guiding element is made dynamically adjustable in its vertical position rather than being fixed. The actuating drive (pneumatic cylinder, motor, or spring mechanism) allows the guiding element to move up and down, adapting its position to the varying pile height. This dynamic adjustment prevents sheets from striking the guide when the pile is low, while keeping the structure relatively simple.
Solution Approach 2:
The vertical position parameter of the sheet guiding element is made variable through the actuating drive. By changing the position parameter dynamically based on pile height, the system prevents harmful contacts while maintaining a simple overall structure that doesn't require complex mechanical linkages.
Data Source
AI summary
A delivery device for a sheet-processing machine, comprises at least one deposition station and a conveyer station, by the use of which, upstream-processed sheets of printed material can be picked up in a transfer location, and can be conveyed through the deposition station via a first conveying system, where they can be deposited optionally to form a stack, or can be conveyed beyond that stack. A holding device, which holds down the uppermost sheet of the stack during the transfer of a sheet to be conveyed against an entrainment or a lifting, is provided with one or with a plurality of holding assemblies which are spaced apart from each other transversely to the transport direction. A sheet-guiding element may be provided, which adjoins the deposition station and which is variable in its vertical position with at least its upstream end by the use of an actuating drive.