Screw Magazine Stability via Support Grid and Collars
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Solution Overview
Problem
Existing screw magazines lack stability as they empty, leading to inaccurate placement of screws and inefficiencies in automatic screwdrivers due to uneven weight distribution, which impedes smooth operation.
Innovation Solution
A screw magazine design featuring a support grid between perpendicular base and cover plates, with peripheral collars to prevent lateral displacement, ensuring vertical alignment of screws and enhanced stability through a connecting wall, allowing for compact arrangement and efficient automatic screw feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If screws are held only near heads and tips without contact along the shank, then frictional forces during screwing-in are reduced, but vertical alignment of screws may be compromised
Solution Approach 1:
The magazine structure is segmented into distinct functional zones: holding zones at the head and tip regions provide alignment, while the intermediate shank region remains free of contact to minimize friction during insertion. This segmentation allows simultaneous achievement of alignment and low-friction insertion.
Solution Approach 2:
Different regions of the magazine have different contact characteristics: the head and tip regions have contact structures for alignment, while the shank region has no contact to reduce friction. This local differentiation of contact properties resolves the contradiction between alignment and smooth insertion.
2Stability of the object's composition
If a support grid with partition walls is added between base plate and cover plate, then stability and vertical alignment are improved, but device complexity increases
Solution Approach 1:
The support grid divides the magazine interior into multiple compartments using partition walls, providing structural support and screw alignment in each section. This segmented approach achieves stability while maintaining a relatively simple overall structure that can be manufactured as a single piece or assembled from simple components.
3Manufacturing precision
If peripheral collars are added to prevent lateral displacement of support grid, then alignment precision is improved, but manufacturing complexity increases
Solution Approach 1:
The peripheral collars are integrated directly into the support grid structure, forming a unified component that provides both support and lateral positioning functions. This merging eliminates the need for separate alignment components, achieving precision without proportionally increasing complexity.
4Quantity of substance
If screws are arranged in multiple rows with tight packing, then magazine capacity increases, but ease of manual handling decreases
Solution Approach 1:
Screws are arranged in multiple rows and columns (two-dimensional array) within the magazine, maximizing capacity by utilizing both horizontal dimensions. The structured grid layout maintains regular spacing and accessible positions, allowing operators to efficiently grasp and remove screws despite the increased quantity.
Data Source
Figure 1~1a
Figure 2~3
Figure 4a~4b
AI summary
The screw magazine (1), in the form of a box, consists of a top plate (2) and a bottom plate (3). Each top and bottom plate has multiple holes (5, 6) arranged in several rows, opposite each other in pairs. The screw shank below the head is held and centered in the holes below the top plate (2). The screw tips (17), which protrude beyond the bottom plate (3), are held and centered in the holes of the bottom plate (3). This magazine is positioned in a magazine holder below a screwdriver (20) and moved by two servo motors (24, 25) in the X and Y directions relative to the screwdriver (20), allowing one screw at a time to be placed under the screwdriver tool.