Printer Cutter Unit with Variable Shearing Angle
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Solution Overview
Problem
Conventional V-shaped cutters struggle to simultaneously cut thin and thick paper smoothly without increasing the drive source's power or size, as the shearing angle must be adjusted to accommodate varying paper thicknesses, leading to inefficient cutting processes.
Innovation Solution
A compact printer and cutter unit with a movable blade system featuring a first and second movable blade portion, held by a rotatable member, and an elastic deformable member that adjusts the shearing angle based on cutting resistance, allowing automatic adaptation to paper thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a V-shaped cutter with a constant shearing angle is used, then the structure is simple, but it cannot smoothly cut both thin and thick paper without increasing the drive source size
Solution Approach 1:
The movable blade is designed with dynamic adjustability of the shearing angle through a rotation mechanism. The blade can change its inclination angle relative to the fixed blade according to paper thickness, allowing optimal cutting performance for both thin and thick paper without requiring increased drive source power. The rotation mechanism enables the blade to adapt its geometry dynamically during operation.
Solution Approach 2:
The shearing angle parameter is made variable rather than constant. By changing the inclination angle of the movable blade, the system optimizes the cutting performance for different paper thicknesses. This parameter change allows the same blade structure to handle varying material properties without requiring a more powerful drive source.
2Force
If a large shearing angle is used for thick paper, then cutting load is reduced, but thin paper bends in a V-shape
Solution Approach 1:
The shearing angle is dynamically adjusted based on paper thickness. For thick paper, a larger shearing angle reduces cutting load, while for thin paper, a smaller shearing angle prevents V-shaped bending. This dynamic adjustment allows the system to optimize both cutting force and paper shape preservation across different material thicknesses.
Solution Approach 2:
The inclination angle of the movable blade is changed according to the thickness of the paper being cut. This parameter adjustment enables the system to reduce cutting load for thick paper while maintaining proper paper shape for thin paper, resolving the contradiction between cutting force and shape preservation.
3Shape
If a small shearing angle is used for thin paper, then smooth cutting is achieved, but thick paper requires high-power drive source
Solution Approach 1:
The movable blade's inclination angle is dynamically adjusted based on paper thickness. For thin paper, a smaller shearing angle ensures smooth cutting without V-shaped bending, while for thick paper, the angle increases to reduce cutting load and allow the use of a smaller drive source. This dynamic adjustment resolves the contradiction between cutting smoothness and drive source power requirements.
Solution Approach 2:
The shearing angle parameter is varied according to paper thickness to optimize cutting performance. This parameter change allows the system to achieve smooth cutting for thin paper while reducing the power requirements for cutting thick paper, eliminating the need for an oversized drive source.
4Adaptability or versatility
If the movable blade is made rotatable to change shearing angle, then adaptability to paper thickness increases, but device complexity increases
Solution Approach 1:
The blade holding mechanism incorporates a rotation mechanism that allows the movable blade to change its inclination angle. This dynamic structure enables automatic adaptation to different paper thicknesses while maintaining a relatively simple overall design. The rotation mechanism provides the necessary adaptability without significantly increasing device complexity.
Solution Approach 2:
The rotatable blade holding mechanism serves multiple functions: it holds the movable blade, enables angle adjustment for different paper thicknesses, and provides automatic adaptation through elastic deformation detection. This multi-functionality reduces the need for separate adjustment mechanisms, thereby limiting the increase in device complexity while achieving high adaptability.
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
Enables smooth cutting of both thin and thick paper without requiring increased motor size, providing a versatile and cost-effective solution by dynamically adjusting the shearing angle in response to paper thickness.
Implementation Method 1
an elastic deformable member configured to urge the first and second movable blade portions in a predetermined direction and elastically deformable, depending on the magnitude of cutting resistance
Data Source
AI summary
A printer has a fixed blade, a movable blade configured to be displaced relative to the fixed blade, and the movable blade has a first movable blade portion inclined from one longitudinal end toward a substantially longitudinal center in a direction opposed to the fixed blade, and a second movable blade portion, which is separated from the first movable blade portion, inclined from another longitudinal end toward the substantially longitudinal center in the direction opposed to the fixed blade. The printer has a holding member configured to rotatably hold the first and second movable blade portions so that a shearing angle formed by the fixed blade and the first or second movable blade portion is variable, and an elastic deformable member configured to urge the first and second movable blade portions in a predetermined direction and elastically deformable, depending on a magnitude of a cutting resistance.