Cutting Device Presser Member for Recording Medium Uplift Prevention
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Solution Overview
Problem
In recording apparatuses, the displacement of recording media during cutting due to paper curl and the lack of a mechanism to restrain uplift cause inaccuracies in cutting position, leading to potential damage and surface scratches.
Innovation Solution
A cutting device with a presser member that moves between holding and releasing positions to prevent uplift, combined with inclined rotary circular blades to maintain cutting linearity, ensures the recording medium is kept flat during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between conveyance rollers and cutter unit is increased to accommodate larger recording heads, then recording speed and area are improved, but paper curl causes the recording medium to lift up and displace during cutting
Solution Approach 1:
The presser member is positioned to press down on the recording medium before the cutting operation begins, preventing the medium from lifting up due to paper curl. This preliminary counteraction eliminates the harmful uplift effect before it can cause cutting position displacement, allowing long conveyance distances to be used without sacrificing cutting precision.
2Manufacturing precision
If a member is provided to hold down the recording medium during cutting to prevent displacement, then cutting position accuracy is improved, but the surface of the recording medium may be damaged
Solution Approach 1:
The presser member is designed to be movable rather than fixed, allowing it to be positioned close to the recording medium surface during cutting to maximize restraint effectiveness, and then retracted after cutting to prevent surface damage. This dynamic positioning enables the system to achieve high cutting precision without compromising the recording medium surface.
Solution Approach 2:
The presser member operates periodically - pressing down on the recording medium before and during cutting, then retracting after cutting is complete. This periodic action ensures the medium is restrained when needed for precision while avoiding continuous contact that would cause surface damage.
3Productivity
If the recording head is made wider to increase recording area, then productivity is improved, but the distance between platen and cutter unit becomes longer causing greater uplift
Solution Approach 1:
By introducing the presser member that presses down on the recording medium before cutting, the harmful effect of paper curl uplift over long distances is counteracted. This enables the system to maintain cutting precision even with the increased platen-to-cutter distance required for wider recording heads.
Data Source
AI summary
A cutting device includes a conveyance unit for conveying a recording medium in a conveyance direction, a guide configured to guide a recording medium, a blade movable in a direction intersecting with the conveyance direction, for cutting the recording medium when the blade moves with a leading end side thereof inclined to the upstream side, a presser member movable to a first position where the presser member holds down the recording medium and to a second position where the presser member does not hold down the recording medium, wherein the presser member holds down the recording medium at a position separated farther than a thickness of the recording medium from the guide in the first position, and wherein the presser member holds down the recording medium at least from before the blade starts to cut the recording medium to when the blade is cutting the recording medium.