Voice Coil Motor Cutter Control for Smooth Contact
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Solution Overview
Problem
Conventional cutting devices face issues with the holder holding the cutter moving smoothly due to sliding resistance and varying spring constants, leading to inconsistent cutting starts and potential cutter bouncing on the target, which affects the quality of the cut.
Innovation Solution
A cutting device with a voice coil motor-driven cutter moving mechanism that employs a controlled electromagnetic force sequence, including a first downward force to overcome resistance, a subsequent upward force to decelerate, and a final cutting force applied after a predetermined time, ensuring stable cutter contact with the target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electric current is supplied to the voice coil motor to move the holder downward, then the cutter contacts the cutting target, but the holder may not move downward smoothly due to sliding resistance and spring force variation
Solution Approach 1:
The controller applies a first electromagnetic force larger than the sum of sliding resistance and spring force before the cutting operation starts. This preliminary action ensures the holder moves downward smoothly from the initial position, overcoming static friction and spring variation to reach a predetermined position reliably before the actual cutting begins.
Solution Approach 2:
The controller applies electromagnetic force in multiple sequential stages: first electromagnetic force to overcome resistance and move the holder, then second electromagnetic force smaller than the first to decelerate and stop the holder at the predetermined position. This periodic application of force ensures smooth, controlled movement and reliable positioning.
2Speed
If the electric current flowing in the voice coil motor is increased to move the holder downward, then the holder moves faster, but the cutter may bounce on the cutting target when moved too vigorously
Solution Approach 1:
The controller applies electromagnetic force in multiple sequential stages with different magnitudes. The first electromagnetic force moves the holder downward, then the second electromagnetic force smaller than the first decelerates and stops the holder. This staged approach prevents the cutter from moving too vigorously and bouncing on the target, ensuring high cutting quality.
Solution Approach 2:
The controller moves the holder to a predetermined position above the cutting target before the actual cutting operation. This preliminary positioning ensures the cutter approaches the target smoothly and contacts it gently, preventing bouncing and ensuring high cutting precision.
3Reliability
If the holder is moved downward smoothly, then the cutter contacts the cutting target consistently, but the cutting operation cannot start immediately due to the time required for smooth movement
Solution Approach 1:
The controller moves the holder to a predetermined position above the cutting target before the cutting operation starts. This preliminary action ensures the holder is positioned correctly and the cutter is ready to contact the target immediately when cutting begins, minimizing time loss while maintaining reliability.
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
The controlled electromagnetic forces ensure smooth downward movement and stable cutter contact, preventing bouncing and ensuring consistent cutting of the target.
Implementation Method 1
when an electric current is supplied to a coil of the voice coil motor, an electromagnetic force is generated, so that a holder holding a cutter is moved in an up-down direction
Implementation Method 2
the holder holding the cutter is urged upward by an elastic body connected with the holder
Data Source
AI summary
A controller includes a cutter movement controller that controls a value of an electric current to flow in a voice coil motor to apply a first electromagnetic force to a holder in a downward direction for a first time duration, then to apply the first electromagnetic force to the holder in an upward direction for a second time duration shorter than the first time duration, to pause the supply of the electric current to the voice coil motor for a third time duration longer than the second time duration, then to apply a third electromagnetic force, which is smaller than, or equal to, the first electromagnetic force and is an electromagnetic force applied to cut a cutting target, to the holder in the downward direction for a fourth time duration longer than the first time duration, and thus to cause a cutter to contact the cutting target, and a cutting controller that, after a predetermined time duration from the time when the electric current starts to flow in the voice coil motor, controls a carriage and a conveyor to start cutting the cutting target.