Mobile Stair Coupling Mechanism to Prevent Die Cutter Track Sticking
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Solution Overview
Problem
Die cutting machines with mobile stairs often experience sticking issues when moving between retracted and extended positions due to waste accumulation in the tracks, causing operational inefficiencies and wasting operator time.
Innovation Solution
A coupling mechanism between the mobile stair and transport rack allows the mobile stair to be automatically pushed into the retracted position and pulled back into the extended position using the transport rack's motion, reducing the likelihood of sticking, and a locking mechanism prevents accidental displacement from the extended to the retracted position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mobile stair is moved on oblique tracks using gravity, then the mobile stair can move from retracted to extended position automatically, but the mobile stair gets stuck due to waste accumulation in the tracks
Solution Approach 1:
The patent replaces the gravity-based oblique track system with a coupling mechanism that uses the transport rack's linear motion to move the mobile stair. The coupling mechanism includes a coupling element on the mobile stair that engages with the transport rack, transferring the rack's kinetic energy directly to the stair without relying on gravity or tracks that accumulate waste.
Solution Approach 2:
The transport rack serves dual functions: it transports materials and simultaneously moves the mobile stair between positions. The rack's own motion provides the kinetic energy needed to pull the stair into the extended position and push it into the retracted position, eliminating the need for separate propulsion systems or gravity-dependent tracks.
2Productivity
If the mobile stair is pushed into retracted position by transport rack, then the loading and unloading process is streamlined, but the mobile stair may be inadvertently pushed into retracted position by operator
Solution Approach 1:
The locking mechanism is engaged by default when the mobile stair is in the extended position, preventing accidental displacement. The coupling mechanism is designed to automatically disengage the locking mechanism only when the transport rack approaches to couple, ensuring the stair remains secured during operator activities until the rack is ready to move it.
Solution Approach 2:
The coupling mechanism acts as an intermediary between the transport rack and the mobile stair's locking mechanism. It detects the approach of the transport rack and triggers the release of the locking mechanism, providing a controlled transition that prevents accidental disengagement while enabling intentional movement when needed.
3Reliability
If a coupling mechanism is used to connect transport rack to mobile stair, then the mobile stair can be pulled into extended position using rack's kinetic energy, but the coupling mechanism adds device complexity
Solution Approach 1:
The coupling mechanism is divided into separate functional elements: a coupling element on the mobile stair, a corresponding engagement feature on the transport rack, and a locking mechanism with a stopper element. This segmentation allows each component to be simple in design while collectively providing reliable coupling, decoupling, and positioning functions without requiring a complex integrated system.
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 enhances the mobility and reliability of the mobile stair by utilizing the transport rack's kinetic energy to move the stair between positions, minimizing sticking occurrences and streamlining the loading and unloading process without the need for electric or pneumatic devices.
Implementation Method 1
The pivot element is configured to pivot opposite to the release direction in a coupling direction, when the pivot element is disengaged from the stopper element and the mobile stair is pushed towards the retracted position or, at the latest, when the transport rack starts to be moved away from the die cutting machine. This motion may be used to bring the connecting portion into engagement with the counterpart portion to couple the pivot element with the transport rack.
Data Source
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AI summary
A die cutting machine has a mobile stair (14), the mobile stair (14) being able to assume a retracted position and an extended position, wherein in the extended position the mobile stair (14) is accessible by an operator. The mobile stair (14) is configured to be pushed into the retracted position by a transport rack (16) and pulled into the extended position when the transport rack (16) is pulled in the opposite direction. A coupling mechanism (30) is arranged on the mobile stair (14) that is configured to couple the transport rack (16) to the mobile stair (14) to pull the mobile stair (14) from the retracted into the extended position and to decouple the transport rack (16) from the mobile stair (14) when the transport rack (16) is moved from the die cutting machine (12) beyond the extended position of the mobile stair (14). An assembly with a die cutting machine has a transport rack (16) separate from the die cutting machine (12) that is configured to be pushed against the die cutting machine (12) and removed therefrom, having a counterpart portion for engaging with the coupling mechanism (30).