Sheet Cutter Pressing Force Control for Defect-Free Cut Starts
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Solution Overview
Problem
Existing cutting devices experience cutting defects at the start of the cutting process due to variations in pressing force applied by the cutter, leading to incomplete or undesired cuts in sheet-shaped objects.
Innovation Solution
A cutting device with a holding member, cutter, pressing force applying unit, and relative position changing unit that controls the pressing force to gradually reduce from an initial to a steady value as the cutter blade moves relative to the object, preventing defects by maintaining a stable cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant pressing force is applied to the cutter during cutting, then the cutting process is simple to control, but cutting defects occur at the start of cutting
Solution Approach 1:
The pressing force applying unit dynamically adjusts the pressing force based on the blade position relative to the object to be cut. When the blade is at the start position, a larger pressing force is applied; when the blade moves to the cutting position, the pressing force is reduced to a predetermined value. This dynamic adjustment prevents cutting defects while maintaining controllable operation.
Solution Approach 2:
The pressing force parameter is changed according to the blade position. The system transitions from a constant pressing force to a variable pressing force that decreases as the blade progresses from the start position to the cutting position. This parameter change eliminates cutting defects without significantly complicating the control system.
2Manufacturing precision
If the pressing force is reduced immediately after the blade cuts into the object, then cutting defects are prevented, but the cutting process becomes unstable
Solution Approach 1:
The system performs preliminary action by applying a larger pressing force when the blade is at the start position to ensure proper engagement. As the blade moves to the cutting position, the pressing force is gradually reduced to a predetermined value. This staged approach maintains cutting process stability while preventing cutting defects.
Solution Approach 2:
The relative position changing unit monitors the blade position relative to the object to be cut and provides feedback to the pressing force applying unit. Based on this feedback, the system adjusts the pressing force appropriately: larger force at start position, reduced force at cutting position. This feedback mechanism ensures both cutting quality and process stability.
Data Source
AI summary
A cutting device includes: a holding member which holds a sheet-shaped object to be cut; a cutter which cuts the object to be cut by changing the position of a blade relative to the object to be cut along the object to be cut in such a state that the blade is cut into the object to be cut; a pressing force applying unit which applies a pressing force to the cutter in contact with the object to be cut; a relative position changing unit which changes the position of the blade of the cutter relative to the object to be cut held by the holding member; and a processor which controls the pressing force applying unit to reduce the pressing force applied to the cutter by the pressing force applying unit along with a change in the position of the blade of the cutter relative to the object to be cut by a predetermined distance or for a predetermined time after the pressing force is applied to the cutter.