Scissors-Type Cutting Device Edge Contact Stability
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Solution Overview
Problem
Cutting devices with scissors-type mechanisms experience reduced sharpness and increased backlash due to slack in the support shaft, leading to separation of the movable and fixed edges, which deteriorates cutting performance over time.
Innovation Solution
Incorporating a pressing section that tilts at least one of the movable or fixed edge main bodies to maintain contact, even when the support shaft slacks, and using a contact point section or actuation lever to stabilize the cutting edges, preventing separation and maintaining sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the support shaft is used to support the fixed edge and movable edge to be capable of mutually rotating, then the cutting device can perform cutting operations, but slack occurs in the support shaft over time causing backlash and separation of edges
Solution Approach 1:
A pressing section is introduced as an intermediary component between the fixed edge and movable edge. This pressing section actively presses the edges together to compensate for slack in the support shaft, ensuring continuous contact and preventing separation during cutting operations.
Solution Approach 2:
The pressing section applies a preliminary pressing force to the movable edge in advance, counteracting the potential separation caused by support shaft slack before it occurs. This preliminary action maintains edge contact stability proactively rather than reactively.
2Manufacturing precision
If the movable edge and fixed edge are pressed together to maintain sharpness, then cutting performance is improved, but additional components increase device complexity
Solution Approach 1:
The pressing section is integrated with the existing support shaft structure, merging the pressing function into the existing mechanism. This combination approach maintains edge sharpness while minimizing the increase in device complexity by reusing existing structural elements.
Solution Approach 2:
The pressing section serves multiple functions: it maintains edge contact pressure for sharpness, compensates for support shaft slack, and guides the movable edge during operation. This multi-functionality reduces the need for additional separate components.
Data Source
AI summary
A cutting device of a scissors type includes a fixed edge, a movable edge, and a support shaft configured to support the fixed edge and the movable edge to be capable of mutually rotating. A movable edge main body of the movable edge including a cut-off edge is cut into, centering on the support shaft, a fixed edge main body of the fixed edge including a cut-off edge. The cutting device includes a receiving member provided along at least an edge front side of the fixed edge main body and an edge front side of the movable edge main body and a pressing section configured to press at least one of the fixed edge main body and the movable edge main body to tilt in the opposite direction of the receiving member to be received by the receiving member.