Movable Wrapping Machine Speed Control
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Solution Overview
Problem
Manually propelled wrapping machines lack precise control over film wrapping speed and configuration, resulting in uneven and inconsistent wraps due to operator-dependent movement, leading to variations in the number of film strips and overlaps.
Innovation Solution
Incorporation of a control unit with sensor devices to measure wheel rotation speed and load height, allowing for adjustment of unwinding unit movement speed to maintain a predefined wrapping configuration, ensuring consistent film placement and overlaps regardless of operator movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the unwinding unit movement speed is set to be constant throughout the wrapping procedure, then the device operation is simplified, but the wrapping consistency deteriorates due to operator-dependent advancing speed variations
Solution Approach 1:
The system transitions from a static, constant unwinding speed to a dynamic speed that automatically adjusts based on the carriage advancing speed. The unwinding unit's movement speed is continuously modified in response to operator pushing speed variations, maintaining consistent film tension and wrapping configuration throughout the wrapping procedure.
Solution Approach 2:
The system implements a feedback mechanism where the actual unwinding unit speed is continuously measured and compared to the desired speed. When deviations occur due to operator-dependent carriage movement, the system automatically corrects the unwinding speed to maintain the predefined wrapping configuration, ensuring consistent film placement and overlaps.
2Manufacturing precision
If the unwinding unit speed is adjusted to match operator-dependent advancing speed, then wrapping consistency improves, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The system replaces complex mechanical speed synchronization mechanisms with an electronic control system. Instead of using mechanical linkages to couple the unwinding unit speed to the carriage advancing speed, the invention uses sensors to detect carriage position and speed, then electronically controls the unwinding unit motor to achieve the desired speed matching, simplifying the overall device architecture.
Solution Approach 2:
The system dynamically changes the operational parameters of the unwinding unit based on real-time detection of carriage advancing speed. By continuously adjusting the unwinding speed parameter in response to operator-dependent movement variations, the system maintains consistent wrapping configuration without requiring complex mechanical synchronization mechanisms.
3Adaptability or versatility
If manual propulsion by operator is used, then machine mobility and adaptability improve, but wrapping precision deteriorates due to variable operator speed
Solution Approach 1:
The system enables the unwinding unit to self-regulate its speed based on detected carriage advancing speed. Instead of requiring the operator to manually coordinate both carriage movement and film unwinding speed, the system automatically adjusts the unwinding speed to match the operator's pushing pace, maintaining consistent wrapping precision while preserving manual mobility and adaptability.
Data Source
AI summary
A manually propelled wrapping machine movable by an operator around a load to wrap the latter with a film of plastic material, comprises a carriage provided with a plurality of supporting wheels and a guiding bar usable by the operator to push and direct the carriage at least along a wrapping path around the load; a column fixed to the carriage and slidably supporting an unwinding unit for dispensing the film; an actuating device for moving the unwinding unit along the column with a specific movement speed; the wrapping machine further includes a first sensor device associated with at least one wheel of said wheels for detecting and measuring a rotation speed of the latter, and a control unit for receiving a signal related to the rotation speed from the first sensor device and calculating an advancing speed of the carriage along the wrapping path and for controlling the actuating device so as to adjust the movement speed of the unwinding unit as a function of the advancing speed so as to wrap the load with a defined wrapping configuration.