Modular Strip Dispenser for Franking Machines
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Solution Overview
Problem
Existing franking and addressing machines face challenges with complex transport systems, limited reloadability during operation, and potential print offsets due to miscoordination between tape ejection and transport speeds, leading to errors and reduced print quality.
Innovation Solution
A modular strip dispenser module with a laterally offset arrangement, sensors, and a mechanism allowing for easy exchange of strips of different lengths and thicknesses, ensuring parallel alignment and continuous adjustment to prevent insertion errors and enable reloads during operation, while maintaining print quality and reducing technical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate drive with motor and reduction gear is used for the strip magazine, then the strips can be output at the correct angle and position, but the device complexity increases and coordination between ejection speed and transport speed becomes problematic
Solution Approach 1:
The patent combines the strip magazine drive with the existing conveyor belt drive system. The strip magazine is driven by the same motor that drives the conveyor belt, eliminating the need for a separate drive system. This merging of drive functions reduces device complexity while maintaining synchronization between strip ejection and transport speeds, preventing print offsets.
Solution Approach 2:
The conveyor belt drive system is made multi-functional by using it to drive both the conveyor belt and the strip magazine. This universal drive system performs multiple functions (transporting mail and ejecting strips) without requiring additional motors or reduction gears, thereby reducing overall system complexity while ensuring coordinated operation.
2Device complexity
If the strip magazine is positioned close to the guide plate, then the transport system can be simplified, but strips may be pushed through too far, bent, and cause errors or separation issues
Solution Approach 1:
The patent positions the strip magazine exit opening at a predetermined distance from the guide plate, which is calculated to allow strips to be ejected and immediately engaged by the conveyor belt without excessive travel. This preliminary positioning prevents strips from being pushed too far or bent, while still maintaining a compact overall system design.
Solution Approach 2:
The conveyor belt acts as an intermediary between the strip magazine and the guide plate. Instead of strips traveling directly from the magazine to the guide plate, the conveyor belt receives and transports them, providing controlled support and preventing excessive bending or pushing through during the transfer process.
3Adaptability or versatility
If individual or few strips are inserted in the shaft support with mechanical lock, then the maximum filling quantity is defined, but strips may be pushed through too far, bent at retaining piece, and trigger errors or make separation impossible
Solution Approach 1:
The patent replaces the static mechanical lock system with a dynamic spring-loaded lever system. The levers can move counter to spring force, allowing them to adapt to different strip configurations (individual or multiple strips) while maintaining proper engagement. This dynamic system prevents strips from being pushed too far or bent by automatically adjusting to the actual strip load.
Solution Approach 2:
The spring force parameter in the lever system can be adjusted to change the engagement characteristics. By modifying the spring constant or pre-load, the system can be tuned to handle different strip types and quantities reliably, preventing both over-pushing and bending while maintaining flexibility in filling options.
4Ease of operation
If the drive in the tape encoder is switched off immediately after singulation, then the coordination between ejection and transport is simplified, but print offsets occur due to speed misalignment
Solution Approach 1:
The patent incorporates feedback from sensors that detect strip position and conveyor belt position. This feedback is used to control the strip magazine drive, ensuring that strip ejection is synchronized with conveyor belt movement. The drive is switched off at the correct moment based on real-time position information, preventing print offsets while maintaining simple control logic.
Data Source
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AI summary
The arrangement has transportation module including circulating conveyor (11) for conveying a printing carrier (3), and print head that is located behind a pressure window to perform printing on printing carrier. A magazine (21) is arranged opposite to conveyor to detect the edge area (31) of printing carrier conveyed by conveyor. The printing on display region (32) of printing carrier is performed.