Removable Pick Unit Assembly with Tortuous Cam Pathway
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Solution Overview
Problem
Existing pick units in dispenser modules, such as those found in ATMs, are prone to jamming and require frequent replacement due to their size and weight, making maintenance time-consuming and physically demanding for service personnel.
Innovation Solution
A modular design for pick units where a removable picking assembly can be swapped out without replacing the entire unit, featuring a tortuous pathway and cam follower mechanism for alignment and engagement with an external gear, along with latches and vacuum pick arms for efficient media retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire pick unit is replaced when the picking assembly fails, then the dispenser can be restored to full functionality, but the replacement operation becomes time-consuming and physically difficult due to the large size and weight of the pick unit
Solution Approach 1:
The pick unit is divided into two main segments: a stationary frame and a removable picking assembly. The picking assembly contains the electro-mechanical components that are prone to failure, while the frame provides structural support and housing. This segmentation allows the picking assembly to be replaced independently without replacing the entire pick unit, reducing the time and physical effort required for maintenance while restoring dispenser functionality.
2Ease of operation
If the picking assembly is designed to be removable and replaceable, then maintenance time and physical effort are reduced, but the device complexity increases due to the need for engagement mechanisms like cam followers and tortuous pathways
Solution Approach 1:
A cam follower acts as an intermediary element between the picking assembly and the frame. The cam follower travels along a tortuous pathway that is externally accessible, allowing the picking assembly to be engaged and disengaged from the frame through a simple pushing motion. The tortuous pathway converts this linear motion into the complex rotational and translational movements needed for proper gear engagement and latch activation, thereby simplifying the user interface while managing the underlying mechanical complexity.
3Ease of operation
If the picking assembly uses a tortuous pathway for cam follower movement, then the assembly can be easily engaged by pushing, but the pathway complexity requires external accessibility that may conflict with compact design
Solution Approach 1:
The tortuous pathway is designed to extend externally along the sidewall of the frame, utilizing the external three-dimensional space rather than consuming internal volume. This allows the cam follower to traverse a complex path that enables easy engagement through pushing motion while keeping the internal footprint of the pick unit compact. The pathway effectively uses the external envelope of the device to achieve complex mechanical motion without increasing the core operational volume.
Data Source
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AI summary
A pick unit (12) is described. The pick unit (12) comprises: a frame (30) and a picking assembly (34a,b). The frame (30) comprises (i) one or more guides (64a,b) for receiving a currency cassette, (ii) a tortuous pathway (86a,b) for guiding and supporting a cam follower (78), and (iii) a detent (96a,b). The picking assembly (34a,b) comprises: (i) a guide edge (60a,b) configured to abut the detent (96a,b) when the picking assembly (34a,b) is moved to an initial alignment position, (ii) a cam follower (78) configured to align with the pathway (86a,b) when the removable picking assembly (34a,b) is moved from the initial alignment position to an engagement position, and (iii) a gear train (70) configured to engage with an upper gear (72) external to the pick unit (12) when the removable picking assembly (34a,b) is moved to an engaged position at which the cam follower (78) has reached an end of the tortuous pathway (86a,b).