Cable Stripping Head Pulley Mechanism for Precise Tool Positioning
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Solution Overview
Problem
Existing cable stripping devices using two synchronously operated motors for knife and centering jaw adjustments are costly, complex, and prone to synchronization errors, leading to inaccurate cutting and centering due to limited drive torque and rotational speed limitations.
Innovation Solution
A device with a single drive mechanism for synchronous rotation of coaxially mounted toothed belt pulleys, allowing angular adjustment between pulleys to precisely control the position of cutting and centering tools, eliminating the need for complex differential drives and reducing the risk of synchronization errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two synchronously operated motors are used for knife and centering jaw adjustments, then positioning accuracy can be improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines two separate motor-driven systems into a single motor system that drives both the knife and centering jaw adjustments. A single motor rotates a first pulley, which through toothed belt connections drives a second pulley and associated adjustment mechanisms, eliminating the need for two independent motors while maintaining synchronized positioning capability
Solution Approach 2:
The patent introduces intermediate mechanical components including toothed belts, pulleys, and a differential mechanism that act as mediators between the single motor and the two adjustment systems. These intermediaries transmit and coordinate motion from the single motor to both the knife and centering jaw, enabling precise control without requiring dual motors
2Manufacturing precision
If two synchronously operated motors are used for knife and centering jaw adjustments, then positioning accuracy can be improved, but synchronization errors occur due to load torque and speed variations
Solution Approach 1:
The patent incorporates a differential mechanism that automatically compensates for speed and load variations between the two driven systems. The differential mechanism receives input from both the first and second pulleys and mechanically adjusts for any speed differences, ensuring that the knife and centering jaw remain synchronized even when operating conditions vary
Solution Approach 2:
By merging the two motor systems into a single motor system with a differential mechanism, the patent eliminates the synchronization errors that occur with independent motors. The differential mechanism ensures that both adjustment systems receive coordinated motion, preventing the load torque and speed variations that cause synchronization drift in dual-motor systems
3Manufacturing precision
If stepper motors are used for differentiated drive, then positioning control can be improved, but rotational speed must be limited due to drive torque decrease
Solution Approach 1:
The patent replaces electronic stepper motor control with a purely mechanical differential drive system. The mechanical differential mechanism inherently maintains synchronization between the knife and centering jaw adjustments without being subject to the speed-torque tradeoff of stepper motors, allowing for higher rotational speeds while maintaining positioning precision
Solution Approach 2:
The patent employs a dynamic mechanical differential mechanism that automatically adapts to varying speed and load conditions. This mechanical system maintains precise positioning control across a wider speed range compared to stepper motors, as it uses mechanical geometry rather than electronic control to maintain synchronization
Data Source
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AI summary
The invention relates to an apparatus (100, 200, 300) for cutting, centering or retaining a cable in a stripping head, comprising a first toothed belt pulley (1) and a second toothed belt pulley (2), which can be rotated coaxially and synchronously, but angularly adjustably with respect to one another about an axis of rotation (X), and a tool flange (21), which is coaxially connected to the first toothed belt pulley (1) and in which a central opening (A) is arranged, through which the cable can be inserted or fed, the tool flange (21) comprising one or more movably attached tools (23), the tools (23) being movable with respect to the axis of rotation (X) by means of the adjusting element (18) connected to the second toothed belt pulley (2), characterized in that the radial distance of the tools (23) from the axis of rotation (X) can be adjusted by means of angular rotation between the first toothed belt pulley (1) and the second toothed belt pulley (2), which are driven by a common drive means (13). The invention further relates to a cable-stripping device comprising an apparatus according to the invention.