Arcade Crane Pulley Layout for Low-Drag Precise Positioning
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Solution Overview
Problem
Existing crane game mechanisms require larger motors and are weakened by friction, drag, and vibration due to the use of belts and complex mechanical systems, which affects the precision and smoothness of the pick-up device's movement.
Innovation Solution
A pulley system using two motors mounted on a rectangular frame with vertically stacked pulleys and monofilaments to move orthogonal rods, reducing drag and allowing smaller motors by pulling the rods from both ends, enabling smooth and precise movement without lubricants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If belts and complex mechanical systems are used to control the pick-up device, then the device can be moved, but friction, drag, and vibration increase, requiring larger motors
Solution Approach 1:
The patent replaces traditional mechanical drive systems (belts, gears, screws) with a monofilament-based pulley system. The monofilaments pass through blocks that slide along the frame sides, directly pulling the rods without intermediate mechanical components. This substitution eliminates friction from gears and belts, reduces drag, and removes the need for lubricants, allowing smaller motors to achieve the same moving force.
Solution Approach 2:
The patent extracts and removes complex mechanical components (belts, gears, screws, lubricants) from the system, retaining only the essential elements (monofilaments, pulleys, sliding blocks). By taking out the problematic mechanical intermediaries, the system achieves direct motor-to-rod control with minimal friction and drag.
2Ease of operation
If bi-directional motors control the pick-up device mechanically, then positioning is achieved, but the system becomes complex with multiple components
Solution Approach 1:
The patent replaces complex bi-directional motor mechanical control systems with a simplified monofilament-pulley system. Each motor controls one rod through monofilaments that pass through sliding blocks, eliminating the need for complex gear trains, belts, and mechanical linkages. The system achieves bi-directional control through the inherent reversibility of the monofilament pull mechanism.
Solution Approach 2:
The patent segments the control system into independent modular units: each motor controls one rod independently through its own set of monofilaments and pulleys. This segmentation simplifies the overall system architecture, making each control unit simple and interchangeable, reducing overall complexity while maintaining full positioning capability.
3Object-affected harmful factors
If rods are moved by pulling from one end only, then the mechanism is simple, but drag and chattering increase
Solution Approach 1:
The patent applies asymmetric positioning of pulleys and monofilament attachment points on the rods. The monofilaments are attached at different locations along each rod, creating an asymmetric pull configuration that balances forces and reduces chattering. This asymmetric arrangement optimizes the distribution of drag forces during rod movement.
Solution Approach 2:
The patent changes the physical parameters of the monofilaments (material composition, thickness, tension) and the pulley system (diameter, bearing quality) to minimize friction and drag. By optimizing these parameters, the system achieves smooth rod movement with reduced chattering while maintaining the simplicity of the pull-from-both-ends mechanism.
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 system achieves 100% coverage of the prize area with smooth and precise movement of the pick-up device, reducing the need for larger motors and lubricants, while maintaining operational efficiency and compliance with legal requirements.
Implementation Method 1
reducing drag and allowing smaller motors by pulling the rods from both ends
Implementation Method 2
At each corner of the rectangular frame is a vertical stack of horizontally oriented pulleys
Data Source
AI summary
A system for maneuvering a pick-up device such as a vacuum, claw, or other crane for an arcade game or the like comprises a metallic frame and two motors. A mount is suspended over the frame and the movement of the mount is managed by monofilament loops rotated by the motors using a set of four stacks of pulleys. The arrangement of the pulleys allows the mount and pick-up device to be easily maneuvered anywhere within the frame.