Dispenser Peg Groove and Recess for Jam-Free Roll Insertion
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Solution Overview
Problem
Existing dispensing systems for material webs wound into rolls face challenges in ensuring correct and secure insertion of bearing pins, particularly with low-value materials like household paper, due to inadequate design features that prevent incorrect insertion and potential damage from forceful attempts.
Innovation Solution
The dispensing system incorporates a guide with a constriction and a corresponding recess, featuring a bearing pin with a circumferential groove and a non-rotational end face recess, ensuring precise alignment and preventing incorrect insertion by using a protruding guide element and a cylindrical trunnion that loosely engages a housing slot, along with axial guide surfaces to prevent jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bearing journals are designed with simple cylindrical surfaces, then manufacturing is easy and cost is low, but incorrect insertion cannot be prevented and damage from forceful insertion occurs
Solution Approach 1:
The bearing journal is designed with an asymmetric recess on its end face that does not correspond to any symmetric feature. This recess has a specific orientation and shape that only matches a corresponding protrusion on the guide when the bearing journal is correctly oriented. This asymmetric design prevents incorrect insertion while maintaining simple manufacturing processes.
2Ease of manufacture
If bearing journals are made from inexpensive materials, then cost is reduced, but they are vulnerable to damage from violent insertion attempts
Solution Approach 1:
The asymmetric recess design creates a mechanical interlock that prevents forceful incorrect insertion before it can occur. The guide's protrusion fits into the bearing journal's recess only in the correct orientation, creating immediate mechanical resistance to wrong-way insertion attempts, thereby protecting inexpensive bearing journals from damage.
3Manufacturing precision
If guides have tight tolerances for bearing journal insertion, then alignment precision is improved, but the risk of jamming increases
Solution Approach 1:
The bearing journal features a localized recess on its end face with specific dimensional tolerances, while the rest of the bearing journal maintains standard cylindrical geometry. This localized precision feature ensures correct orientation without requiring tight tolerances across the entire bearing journal, thereby preventing jamming while achieving proper alignment.
4Ease of manufacture
If multiple bearing journals have identical designs, then manufacturing is simplified, but correct arrangement of rolls cannot be ensured
Solution Approach 1:
Each bearing journal is equipped with an asymmetric recess on its end face that provides a unique orientation reference. This allows multiple bearing journals to be manufactured using the same basic process while the asymmetric feature ensures each one can only be inserted in the correct orientation, preventing incorrect roll arrangement.
Data Source
Figure 1~3
Figure 4~6
AI summary
The bearing journal (5) has a rotating bearing surface (8) that is formed at the bottom of a circumferential groove (7), and a non-rotating fitting surface (9) that is formed on a recess (12) formed at the free end (11) of the journal. An axial guide surface (10) is formed by the side-surface of the circumferential groove proximal to the free end of the bearing journal. An independent claim is also included for a material dispensing system.