Knife Holder Fixing Device Prevents Evasive Motion
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Solution Overview
Problem
Existing knife holders for cutting machines often experience evasive motion during the cutting process due to additional operating forces, particularly when pneumatically actuated, causing the knife to deviate from the desired cutting position.
Innovation Solution
A knife holder with a independently actuable fixing device that secures the knife carrier in the cutting position, allowing it to be moved parallel to the axis of rotation in a force-controlled manner, using a combination of mechanical, electrical, pneumatic, or hydraulic activation to prevent movement relative to the axis of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the knife holder is pneumatically actuated for positioning the knife carrier, then the positioning can be achieved, but the knife performs evasive motion during the cutting process due to additional operating forces
Solution Approach 1:
The positioning system is divided into two independent parts: the setting device for positioning the knife carrier parallel to the rotation axis, and the fixing device for securing it in that position. This segmentation allows each device to perform its specific function without interference, preventing evasive motion while maintaining positioning capability.
Solution Approach 2:
The fixing device is activated in advance before the cutting process to secure the knife carrier in the desired position. This preliminary fixing action prevents any evasive motion during the subsequent cutting operation, ensuring position stability while the knife performs its cutting function.
2Reliability
If the knife carrier is allowed to move freely during cutting, then evasive motion can occur, but if fixed rigidly, then positioning precision is lost
Solution Approach 1:
The system transitions from a static fixed position to a dynamic controlled position. The knife carrier is first positioned precisely by the setting device, then secured by the fixing device. This dynamic approach allows the system to achieve both positioning precision and position stability at different stages of the cutting process.
Solution Approach 2:
The setting device performs the preliminary action of positioning the knife carrier with high precision parallel to the rotation axis. Once positioned, the fixing device secures it in that precise position, ensuring both positioning precision and position stability are achieved before cutting begins.
3Reliability
If the fixing device is activated during cutting, then evasive motion is prevented, but the actuator experiences increased forces
Solution Approach 1:
The fixing device is activated before the cutting process begins, not during. This preliminary activation allows the knife carrier to be secured in the desired position before cutting forces are applied, preventing evasive motion while avoiding the need to counteract large cutting forces with the fixing device.
Solution Approach 2:
The system separates the positioning function (setting device) from the securing function (fixing device). The setting device handles positioning with smaller forces, while the fixing device provides stability with minimal force requirement since it only needs to maintain position, not counteract cutting forces.
Data Source
AI summary
The invention relates to a knife holder (1) for cutting machines, with a knife carrier (2) rotatably mounted around an axis of rotation for holding a knife and a setting device (3) for the knife carrier (2), wherein the knife carrier (2) can be driven by the setting device (3) parallel to the axis of rotation (4) between a standby position and a cutting position, and wherein the knife holder (1) comprises a fixing device (5) that can be activated independently of the setting device (3), with which the knife carrier (2) can be fixed in the cutting position in the direction of the axis of rotation (3).