Cutter Unit Movable Blade Wear Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tape printing apparatuses face issues with wear and reduced durability of the movable blade due to high sliding loads, and methods to reduce this load, such as using lubricants or sleeves, complicate manufacturing and increase costs.
Innovation Solution
A cutter unit with a movable blade that is urged by an urging member to a backward side in the advancing direction, reducing the sliding load on the movable blade, and featuring a rack holder with a movable blade holder and an urging member to support and position the blade effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a pressing spring is used to urge the movable blade to the fixed blade side, then the cutting force is improved, but the sliding load on the movable blade increases causing wear and reduced durability
Solution Approach 1:
A pressing member is introduced as an intermediary component between the movable blade and the pressing spring. This pressing member has a pressing surface that contacts the movable blade and a larger contact area with the pressing spring, effectively distributing the sliding load and preventing direct contact between the blade and spring, thereby reducing wear while maintaining cutting force
Solution Approach 2:
The pressing member is designed with different surface properties: a smooth pressing surface for the movable blade to minimize friction, and a larger contact area for the pressing spring to distribute the load. This local differentiation of surface qualities optimizes both cutting performance and durability
2Reliability
If a lubricant or sleeve is provided between the pressing spring and movable blade to reduce sliding load, then the blade durability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The pressing member is designed to automatically distribute the pressing force through its geometry without requiring external lubrication or complex assembly. The larger contact area with the pressing spring naturally reduces sliding load, eliminating the need for additional lubricants or sleeves while maintaining simplicity in manufacturing
3Manufacturing precision
If the movable blade is pressed to the fixed blade side, then the cutting precision is improved, but the sliding wear increases reducing the lifetime of the movable blade
Solution Approach 1:
The pressing member serves as a mediator that maintains the necessary pressing force for precise cutting while protecting the movable blade from direct contact with the pressing spring. This intermediary structure preserves cutting precision through adequate pressure while extending blade lifetime by eliminating direct sliding contact
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 solution effectively reduces the sliding load on the movable blade, thereby extending its lifespan and improving the durability of the cutting mechanism while simplifying the manufacturing process.
Implementation Method 1
an urging member configured to urge the movable blade to the backward side in the advancing direction
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A cutter unit (4) configured to cut a recording sheet (P) to be advanced toward a forward side in an advancing direction, includes: a fixed blade (100), which includes a fixed blade edge (110), and is provided on a first surface side of the recording sheet (P); a movable blade (200) including: a movable blade edge (210) opposed to the fixed blade edge (110) in a cutting direction crossing the advancing direction; and a sliding surface (211), which is provided on a backward side in the advancing direction, and is configured to be slid on the fixed blade (100); and a rack holder (300) capable of reciprocating along the cutting direction, the rack holder (300) including: a movable blade holder (320) configured to support the movable blade (200); and an urging member (330) configured to urge the movable blade (200) to the backward side in the advancing direction.