Braking Device for Stacking Value Documents
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Solution Overview
Problem
Existing value-document processing systems face challenges in efficiently stacking documents at high transport velocities while maintaining low space requirements and ensuring high throughput and stacking quality.
Innovation Solution
A compact stacking apparatus with a braking device featuring a transport shaft and a braking shaft with specific roller configurations, including driving, cam, and eccentric rollers, which control the clamping and braking of documents to slow them down before deposit, ensuring precise alignment and high-quality stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stacking wheels with spiral sheet slots are used for high velocity transport, then stacking speed is improved, but space requirements increase
Solution Approach 1:
The invention extracts the stacking function from the transport path by using a braking device that acts on documents already in the transport stream. Instead of using a large stacking wheel with spiral slots that requires documents to be fed into a rotating structure, the patent applies a localized braking action using cam and eccentric rollers that clamp documents against the transport shaft, allowing stacking to occur without requiring the documents to enter a large circular path.
Solution Approach 2:
The invention transitions from a two-dimensional spiral stacking pattern (requiring large radial space) to a one-dimensional linear braking action along the transport path. The cam and eccentric rollers apply clamping force in the vertical dimension while maintaining horizontal transport, effectively stacking documents without requiring the large circumferential space of traditional stacking wheels.
2Area of stationary object
If gravitational stacking without stacking wheel is used, then space requirements are reduced, but stacking quality deteriorates at high velocities
Solution Approach 1:
The braking device performs preliminary clamping action on documents before they reach the deposit means. By applying the cam and eccentric rollers to clamp documents against the transport shaft in advance, the system prepares documents for precise stacking before gravity takes over, ensuring proper alignment and stack quality even at high velocities where gravitational stacking alone would be insufficient.
Solution Approach 2:
The braking device acts as an intermediary between the high-velocity transport system and the deposit means. Instead of relying solely on gravity to slow and stack documents, the cam and eccentric rollers serve as a mechanical intermediary that actively clamps and brakes documents, providing controlled deceleration and alignment before final deposition, thereby maintaining stacking quality at high velocities.
3Productivity
If transport velocity is increased, then productivity is improved, but stacking quality deteriorates
Solution Approach 1:
The braking device introduces dynamic control to the stacking process through the cam and eccentric rollers that can be activated at specific moments during document transport. The system transitions from constant high-velocity transport to controlled deceleration when the cam mechanism engages, allowing the document to be braked and aligned dynamically before deposition, thus maintaining stacking quality even when overall transport velocity remains high.
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 efficient stacking of value documents at high transport velocities with low space requirements, maintaining high throughput and improved stacking quality by controlling the braking and alignment of documents, thus addressing the limitations of existing systems.
Implementation Method 1
the cam of the cam roller can electively be brought in engagement with the opposing rotatably supported driving roller, so a value document being transported therebetween is clamped between these
Implementation Method 2
the eccentric roller can electively be brought in engagement with the opposing driving roller so that a value document between these becomes clamped
Implementation Method 3
By the rotation of the braking shaft, the cam of the cam roller can electively be brought in engagement with the opposing rotatably supported driving roller
Data Source
AI summary
A stacking apparatus for value documents, having a stack deposit device and a braking device which is arranged along the transport path of the value documents immediately before the stack deposit device. On the transport shaft of the braking device at least one driving roller is firmly mounted and at least one roller rotatably supported on the transport shaft. At least one cam roller is firmly mounted on a braking shaft of the braking device and at least one eccentric roller. By a rotation of the braking shaft, the eccentric roller can electively be brought in engagement with the opposing driving roller so that a value document becomes clamped between these, or be brought out of engagement with the opposing driving roller, so that the value document is no longer clamped between these, but rather is brakable by the engagement between the cam roller and the rotatably supported roller.