Parallel Scraper Mechanism for Flat Goods Separation
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Solution Overview
Problem
Existing separating devices for flat goods, such as mail items, struggle to reliably separate items of different thicknesses, leading to either multiple deductions or jams, due to uneven force distribution and friction issues when handling stacks with varying thicknesses.
Innovation Solution
A device with a conveyor element and a scraper system that includes a guide arm with additional rotational freedom, allowing the scraper to move parallel to the conveyor element, ensuring uniform force distribution and a wider gap for thicker items, using a pivoting lever and toothed belt mechanism to maintain parallel alignment and adjust the actuating force based on item thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuating force on the scraper is increased to prevent multiple deductions of thin items, then the retention capacity for thin shipments increases, but jams occur for thin shipments because the gap does not open properly
Solution Approach 1:
The scraper is made dynamically adjustable through a pivotable guide arm mechanism that changes the scraper's position and orientation based on the thickness of the shipment. The actuating force is applied at a variable position along the guide arm, allowing the system to adapt the effective force and gap opening dynamically rather than using a fixed static configuration
Solution Approach 2:
The system changes the physical parameters of the scraping mechanism by varying the position of the guide arm pivot point and the angle of the scraper relative to the conveyor element. This allows the actuating force to be effectively adjusted without changing the force magnitude itself, adapting the system behavior to different shipment thicknesses
2Ease of operation
If the actuating force on the scraper is decreased to enable gap opening for thin shipments, then the gap opens properly, but multiple deductions occur
Solution Approach 1:
The guide arm mechanism provides dynamic adjustment of the scraper's effective position and orientation. By pivotably mounting the guide arm and applying actuating force at variable positions, the system can optimize the gap opening for thin items while maintaining sufficient retention force through the mechanical advantage of the lever arm configuration
Solution Approach 2:
The solution moves from a single-dimensional force application (perpendicular to conveyor) to a two-dimensional adjustment system by allowing the guide arm to pivot and change the scraper's angular position. This adds an angular dimension to the force application, enabling independent optimization of gap opening and retention forces
3Ease of operation
If the scraper is positioned at an angle to the conveying direction to open the gap, then the gap opens for thicker items, but the force distribution on the scraper becomes uneven
Solution Approach 1:
The guide arm mechanism dynamically adjusts the scraper's angular position relative to the conveying direction. By pivotably mounting the guide arm and applying actuating force at optimized positions, the system can open the gap for thicker items while maintaining more uniform force distribution through the mechanical configuration, rather than using a fixed angled position
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 ensures reliable separation and processing of items with different thicknesses, preventing jams and double deductions by maintaining uniform static friction and accommodating thicker goods without accumulation, thereby improving the handling of flat goods with varying dimensions.
Implementation Method 1
a conveyor element (1a, 1b, 1c) which transports goods (G) supplied in the form of a stack, in particular mail items or printed products, in a transport direction (v)
Implementation Method 2
a scraper (2a, 2b) opposite the conveyor elements, which is biased by an actuating force in the direction of the conveyor elements
Implementation Method 3
The (resulting) actuating force acts on the wiper in a zone lying between the axis and the inlet area of the wiper
Data Source
Figure 1(a)~1(c)
Figure 2(a)~3(c)
Figure 4(a)~4(b)
AI summary
The invention relates to a device for singulating flat goods (G), in particular mail items or printed products, fed in a stack, comprising at least one conveying element (1) which transports the goods (G) in a transport direction (v), and at least one scraper (2) opposite the conveying element (1), which is movably mounted on a guide arm (3) and biased in the direction of the conveying element (1) by an actuating force. The singulation of both thick and thin goods is made possible according to the invention by the fact that the guide arm (3) is rotatably connected to a first end (4a) of a pivot lever (4) via a first pivot joint (5), and a second end (4b) of the pivot lever (4) is rotatable about a second pivot joint (6).