Sheet Cutting Device Vertical Retraction Mechanism
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Solution Overview
Problem
Conventional sheet cutting devices in image forming apparatuses face issues with cutter jam and increased apparatus size due to the need for a tilted cutter holder to differentiate forward and backward cutting paths, which hampers productivity and space efficiency.
Innovation Solution
The sheet cutting device employs a cutter holder that moves along a first path to cut the sheet and a second path that is perpendicular to both the sheet feed and width directions, allowing the cutter holder to be retracted away from the sheet feed path in the thickness direction, preventing cutter jam and enabling continuous sheet feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backward path of the cutter is arranged at a downstream side in the sheet feed direction to prevent cutter jam, then the reliability is improved, but the device complexity increases due to the tilted cutter holder mechanism
Solution Approach 1:
The patent changes the differentiation dimension from the sheet feed direction (horizontal tilt) to the thickness direction (vertical offset). The second path is disposed away from the first path in the thickness direction of the sheet, allowing the cutter holder to be retracted away from the sheet feed path vertically rather than tilting horizontally. This resolves the contradiction by maintaining reliability through path differentiation while eliminating the complex tilted holder mechanism.
2Reliability
If the cutter holder is tilted toward the downstream side to differentiate forward and backward paths, then the cutter jam is prevented, but the apparatus size increases due to required pivot space
Solution Approach 1:
The patent relocates the path differentiation from the horizontal plane (requiring lateral pivot space) to the vertical dimension (thickness direction). By disposing the second path away from the first path in the thickness direction, the cutter holder can be retracted vertically without requiring additional horizontal space for pivoting, thus preventing cutter jam while maintaining compact apparatus size.
3Device complexity
If the cutter holder remains on the sheet feed path after cutting operation, then the device structure is simplified, but the productivity decreases due to interrupted sheet feeding
Solution Approach 1:
The patent enables the cutter holder to move vertically in the thickness direction to a retracted position on the second path after cutting. This vertical movement allows the cutter holder to clear the sheet feed path without requiring complex horizontal repositioning mechanisms, thereby maintaining simple device structure while enabling continuous sheet feeding and improving productivity.
4Reliability
If a tilted cutter holder is used to differentiate cutting paths, then the cutter jam is prevented, but the manufacturing cost increases due to additional space requirements
Solution Approach 1:
The patent utilizes the thickness direction (vertical dimension) for path differentiation instead of the horizontal sheet feed direction. This allows the cutter holder to be retracted vertically on the second path, eliminating the need for additional lateral space and tilted holder mechanisms, thereby reducing manufacturing complexity and improving space efficiency while maintaining reliability.
Data Source
AI summary
A sheet cutting device includes a cutter including opposed blades to cut a sheet fed along a sheet feed path to the device, a cutter holder holding the cutter and reciprocally movable in a width direction of the sheet perpendicular to a sheet feed direction in which the sheet is fed, and a guide member including a first path to guide the holder in the width direction of the sheet to cut the sheet with the cutter and a second path to guide the holder in the width direction after the sheet is cut. The second path is disposed away from the first path in a thickness direction of the sheet perpendicular to both the sheet feed direction and the width direction of the sheet. When the holder moves along the second path, the holder is retracted away from the sheet feed path in the thickness direction of the sheet.