Handheld Packaging Machine Inching Control for Strap Locking
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Solution Overview
Problem
Handheld packaging machines without lifting handles face issues with strap falling and displacement during strapping operations, affecting packaging quality due to automatic locking, tightening, and welding mechanisms.
Innovation Solution
A control apparatus with an inching switch on the grip handle controls the steering engine motor independently, using a single-chip microcomputer to manage unlocking and locking based on travel detection switches, ensuring the strap remains locked during handling and allowing for flexible operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the handheld packaging machine operates in full-automatic mode with a single button press, then the locking, tightening, welding and unlocking operations are automated, but the strap may not be properly locked and may fall out or displace, affecting packaging quality
Solution Approach 1:
The patent introduces an inching switch that provides real-time feedback to the controller about the steering engine motor's operational state. The controller continuously monitors the switch signal and adjusts the motor's operation accordingly, ensuring the strap is properly locked before the machine is released from hand. This feedback mechanism resolves the contradiction by adding a reliability check to the automated process.
Solution Approach 2:
The system performs self-checking through the inching switch and controller that automatically verifies the locking status. The controller monitors the inching switch signal throughout the operation and can intervene to correct any potential locking failures, making the system self-verifying and self-correcting without requiring external intervention.
2Ease of operation
If the steering engine electric motor is controlled automatically in sequence by a single button press, then the operation is simplified, but the controller cannot real-time monitor and adjust the locking status, leading to potential strap displacement
Solution Approach 1:
The inching switch provides continuous feedback to the controller during the automated sequence. The controller uses this real-time information to monitor the steering engine motor's position and locking status, allowing it to adjust operations to maintain packaging and strapping quality while keeping the user interface simple.
Solution Approach 2:
The controller performs preliminary monitoring of the inching switch signal before and during the locking operation. By detecting the switch signal in advance and throughout the process, the controller can ensure the strap is properly locked before the machine is released, preventing displacement without complicating the user operation.
3Ease of operation
If the inching switch is arranged on the front of the lower side of the grip handle, then it is conveniently operable by index finger in handheld state, but the control mechanism becomes more complex
Solution Approach 1:
The inching switch is positioned at a specific location on the grip handle where it is most easily accessible to the user's index finger during handheld operation. This localized positioning optimizes user interaction while the switch itself remains a simple component, minimizing the increase in overall device complexity.
Data Source
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AI summary
Disclosed is a control apparatus for a handheld packaging machine. An inching switch is arranged on the front of a lower side of a grip handle, and the startup of a steering engine electric motor is independently controlled by the inching switch. A controller detects signals of the inching switch all the time; determines, once detecting signal corresponding to the inching switch being switched on, whether a travel detection switch is in place; controls, if the travel detection switch is not in place, the steering engine electric motor to operate in an unlocking direction; and controls, if the signal corresponding to the inching switch being switched on is not detected, the steering engine electric motor to operate in a corresponding locking direction. The apparatus performs independent control by means of an inching switch, and when still in a handheld state, can make as needed a handheld packaging machine with a strap loaded enter a locking state, such that the problem of strap falling can be solved, and the quality is ensured; and since the inching switch of the apparatus is arranged on the front of a lower side of a grip handle of the handheld packaging machine, the apparatus can be conveniently operated in the handheld state, such that the inching switch is operated in a timely manner and continuously pressed as needed, and thus the operation of the handheld packaging machine is more flexible.