Printer Paper Cutter Blade Geometry to Prevent Adhesive Buildup
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Solution Overview
Problem
Existing printers face issues with adhesive accumulation between movable and fixed blades, leading to increased load on the movable blade, improper cutting, and paper jams, due to surface contact and non-aligned cutting lines caused by V-shaped blade configurations.
Innovation Solution
The cutting device includes a fixed blade with an inclined portion and a movable blade with an inclined edge, spaced apart from their respective bodies, and one end inclined downward, facilitating adhesive discharge and straight cutting lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the movable blade and fixed blade are configured to engage with surface contact, then the cutting function is achieved, but adhesive accumulates in the engagement region causing increased load and potential blade bonding
Solution Approach 1:
The blade edges are designed to engage in a specific spatial arrangement where the movable blade edge and fixed blade edge are positioned at different depths or angles, creating a non-surface-contact engagement. This dimensional change prevents adhesive from accumulating at the engagement interface while maintaining effective cutting functionality.
Solution Approach 2:
The blade edges are configured with asymmetric geometries where the movable blade edge and fixed blade edge have different angles, lengths, or positions. This asymmetry prevents the blades from contacting at a surface level, thereby preventing adhesive accumulation while preserving the cutting action.
2Device complexity
If a V-shaped blade edge configuration is used, then the cutting structure is simplified, but the cutting lines from left and right blades are not aligned in a straight line
Solution Approach 1:
The V-shaped blade edges are designed with asymmetric parameters where the left and right blades have different angles or positions relative to the paper path. This asymmetric configuration ensures that despite the simplified V-shape structure, the cutting lines from both blades align perfectly in a straight line, solving the precision issue while maintaining structural simplicity.
3Ease of operation
If the movable blade reciprocates linearly with respect to the fixed blade, then the cutting motion is straightforward, but adhesive accumulates at the center of the V-shaped blade edge
Solution Approach 1:
The blade engagement is configured in a multi-dimensional arrangement where the movable blade edge and fixed blade edge are positioned at different angles or depths. This dimensional change causes adhesive to be distributed along the engagement path rather than concentrating at a single point, preventing adhesive accumulation at the center of the V-shaped blade edge while maintaining linear reciprocating motion.
Data Source
AI summary
This printing paper cutting device for a printer is installed on a printer so as to cut printing papers which have finished printing, and comprises: a fixed blade (51) fixed to the printer (1); and a movable blade (52) installed on the printer to be able to reciprocate such that same moves toward the fixed blade by means of a driving means, thereby cutting printing papers while overlapping the fixed blade. The fixed blade (51) comprises: a plate-shaped fixed blade body portion (511) fixed to the printer (1); an inclined portion (513) inclined from the plane of the fixed blade body portion (511); and a fixed blade cutter portion (512) formed along the front end of the inclined portion (513). The movable blade (52) comprises: a plate-shaped movable blade body portion (521) installed on the printer (1); an inclined portion (523) inclined from the plane of the movable blade body portion (521); and a movable blade cutter portion (522) formed along the front end of the inclined portion (523). The plane on which the fixed blade cutter portion (512) and the movable blade cutter portion (522) overlap is spaced apart from the plane of the fixed blade body portion (511) and the plane of the movable blade body portion (521).