Self-Locking Tape Unwinding Device for Stable Dispensing
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Solution Overview
Problem
Tapes with adhesive surfaces become loose and unstable during unwinding due to lack of constraint, leading to reduced stability and efficiency in carton sealing.
Innovation Solution
A tape unwinding device with a self-locking mechanism, featuring a disk gear, shifting card, swing arm, and torsional springs, which creates directional resistance and self-locks the tape roll by inserting a shifting card into toothed grooves, preventing further unwinding when not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tape roll directly sleeves the outside of a shaft body and rotates freely, then the tape can be pulled out smoothly, but the tape in the tape roll becomes loosened and unstable after being unwound
Solution Approach 1:
The shifting card is designed to dynamically change position between engaged and disengaged states with the toothed groove. When the swing arm is in the locking position, the shifting card engages with the toothed groove to prevent rotation. When the swing arm moves to the unlocked position, the shifting card disengages from the toothed groove, allowing free rotation for tape dispensing. This dynamic state change resolves the contradiction between stability and ease of operation.
Solution Approach 2:
The system changes the rotational constraint parameter of the shaft based on operational needs. The first torsional spring maintains a default locked state where the shifting card engages the toothed groove, preventing rotation. When force is applied to move the swing arm, the system transitions to an unlocked state where the shifting card disengages, allowing rotation. This parameter change between constrained and unconstrained states resolves the technical contradiction.
2Stability of the object's composition
If a self-locking mechanism is added to prevent tape loosening, then the tape roll stability is improved, but the device complexity increases
Solution Approach 1:
The first torsional spring provides automatic self-locking functionality without requiring external control mechanisms. The spring maintains constant pressure on the shifting card against the toothed groove, ensuring the locked state is maintained automatically. The system serves itself by using the spring's elastic energy to enforce the locking condition, eliminating the need for motors, sensors, or complex control circuits.
Solution Approach 2:
The shifting card acts as an intermediary element between the shaft and the swing arm mechanism. It translates the swing arm's positional state into rotational constraint or freedom of the shaft. The shifting card engages with the toothed groove to transmit locking force, and disengages to allow rotation, serving as a mechanical mediator that simplifies the overall control structure.
Solution Approach 3:
The locking function is segmented into distinct components: the toothed groove on the shaft, the shifting card with its guide surface, and the swing arm with the insert. This segmentation allows each component to perform a specific function - the toothed groove provides engagement points, the shifting card provides the locking interface, and the swing arm provides the actuation mechanism. This modular segmentation reduces overall system complexity compared to a monolithic locking 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
Enhances unwinding stability and prevents tape loosening by ensuring consistent rotational speed and self-locking the tape roll, maintaining stability during and after use.
Implementation Method 1
a first torsional spring being mounted between the shifting card and the mounting frame, and the shifting card being pulled by a torsion of the first torsional spring to swing to the disk gear
Implementation Method 2
a bearing block is fixed on the mounting frame, a second bearing is nested and fixed outside the bearing block, one end of the swing arm is provided with a connecting ring, and the connecting ring fixedly sleeves the outside of the second bearing
Data Source
AI summary
The present disclosure provides a tape unwinding device with a self-locking function. When a tape is unwound by the device, a swing arm swings under the action of a tension of the tape until an insert is separated from a shifting card, and then, the tape starts to be unwound, which is beneficial to the reduction of a rotational acceleration during unwinding and the improvement of unwinding stability. When the tape is not acted by an external force due to unwinding ending of the tape, the swing arm swings until the insert is inserted into a limiting slot of the shifting card, and pushes the end of the shifting card to be inserted into a toothed groove, so that the disk gear is stuck by the shifting card, then, a tape roll cannot rotate to be further unwound, and tape loosening caused by self-rotation of the tape roll is avoided.