Stepping Motor Tape Cutting Apparatus Torque Control
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Solution Overview
Problem
Existing tape cutting apparatuses face instability in cutting force due to inaccuracies in coil springs and torque limiter mechanisms, leading to inconsistent cutting performance and increased complexity.
Innovation Solution
A tape cutting apparatus utilizing a stepping motor with a motor control unit that continues the cutting operation until the motor loses steps, stabilizing torque at a predetermined step-out torque by adjusting the drive pulse cycle based on torque characteristics, eliminating the need for torque limiters and allowing for accurate cutting force control across various tape types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a torque limiter with a coil spring is used to control the cutting force of the half cutter, then the cutting force can be limited, but the cutting force becomes unstable due to accuracy errors in the coil spring and friction variations
Solution Approach 1:
The patent replaces the mechanical torque limiter system (gears and coil spring) with a stepping motor control system. The stepping motor's inherent step-out torque characteristic is utilized to provide stable cutting force control without mechanical torque limiting components. The control unit continues the cutting operation until the stepping motor loses steps, at which point the torque stabilizes at the step-out torque value.
2Force
If a torque limiter is mounted in the transmitting mechanism to control cutting force, then cutting force can be controlled, but the apparatus becomes complex and larger in size
Solution Approach 1:
The patent extracts and removes the torque limiter mechanism from the transmitting mechanism. Instead of incorporating mechanical torque limiting components (gears, coil springs, friction elements), the invention utilizes the control characteristics of the stepping motor itself to achieve torque control, thereby simplifying the overall apparatus structure.
Solution Approach 2:
The stepping motor provides its own torque control function through its inherent step-out characteristic. The motor's control unit leverages the motor's own operational characteristics (step-out torque) to achieve the desired cutting force control, eliminating the need for separate torque limiting mechanisms.
3Measurement precision
If the cutting operation is stopped immediately after the stepping motor loses steps, then the torque control is responsive, but the cutting operation may not be complete due to timing variations
Solution Approach 1:
The control unit continues the cutting operation for a predetermined period or number of steps after the stepping motor loses steps. This preliminary extension of the cutting operation ensures that the cutting is completed reliably, accounting for any timing variations or delays in the torque transmission and cutting process.
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
This approach enables high-accuracy, stable cutting force control with a simple configuration, effectively cutting different tape types without torque limiters, ensuring reliable half-cutting operations and reducing apparatus complexity.
Implementation Method 1
a stepping motor configured to cause the half cutter to perform a cutting operation
Data Source
AI summary
A tape cutting apparatus including: a half cutter configured to cut a body tape or a release tape with respect to a processed tape having the release tape adhered to the body tape; a stepping motor configured to cause the half cutter to perform a cutting operation; and a motor control unit configured to control the stepping motor, wherein the motor control unit is configured to continue the cutting operation until the stepping motor loses steps.