Sickle Bar Positioning for Simplified Blade Replacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sickle cutting apparatuses face challenges in simplifying the process of changing blades, requiring manual intervention and lack precise control over the reciprocating sickle bar's position during shutdown.
Innovation Solution
A system with a drive mechanism that halts the sickle bar at a predetermined position using a physical stop member or sensing system, allowing for precise synchronization and automatic blade change by controlling the reciprocating movement and using a control device to maintain synchronization between multiple sickle bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sickle bar is allowed to stop at any position during shutdown, then the shutdown process is simpler, but blade replacement becomes more difficult and time-consuming
Solution Approach 1:
The system performs preliminary positioning of the sickle bar during the shutdown process by controlling the reciprocating movement to bring the sickle bar to a predetermined position before complete shutdown. This preliminary action ensures that blades are automatically aligned with their corresponding guards, facilitating easier and faster blade replacement without requiring manual intervention to align components.
Solution Approach 2:
The position control system enables the sickle bar to automatically position itself at the predetermined location during shutdown through controlled reciprocating movement. This self-positioning capability eliminates the need for external manual alignment operations, allowing the system to service itself by ensuring proper blade-guard alignment automatically during the shutdown sequence.
2Ease of manufacture
If a position control system is added to halt the sickle bar at a predetermined position, then blade replacement is simplified, but the device complexity increases
Solution Approach 1:
The position control system is integrated into the existing reciprocating drive mechanism, allowing the same drive system to perform both cutting operations and precise positioning functions. By making the drive system multi-functional, the patent avoids adding separate dedicated positioning mechanisms, thereby reducing overall device complexity while still achieving simplified blade replacement through controlled positioning.
Solution Approach 2:
The patent combines the positioning function with the existing reciprocating movement system by controlling the phase and position of the reciprocating cycles. Instead of merging separate systems, the positioning capability is integrated into the operational cycles of the drive system, eliminating the need for additional independent positioning mechanisms and reducing overall system complexity.
3Reliability
If the sickle bar is halted at a predetermined position during shutdown, then synchronization between multiple sickle bars is improved, but the shutdown procedure becomes more complex
Solution Approach 1:
The system uses feedback from position sensors or phase detection mechanisms to monitor the location of reciprocating sickle bars and adjust their movement accordingly. During shutdown, this feedback enables the control system to maintain synchronized positioning of multiple sickle bars at their predetermined positions, ensuring reliable synchronization without requiring overly complex manual shutdown procedures.
Solution Approach 2:
Before complete shutdown occurs, the system performs preliminary synchronized positioning of all reciprocating sickle bars to their predetermined positions. This preliminary action ensures that all blades are aligned with their corresponding guards across multiple sickle bars simultaneously, establishing reliable synchronization before the shutdown is finalized, thereby simplifying the overall shutdown procedure.
Data Source
AI summary
A sickle cutting system is mounted on a header for forward travel over ground having a standing crop thereon and includes a cutter bar with a plurality of knife guards and at least one sickle bar with a drive system for driving the sickle bar through repeated cycles of reciprocating movement from start-up of the system through to a shut-down. The drive system includes an arrangement to halt the sickle bar on shut-down at a predetermined position of the knife blades relative to the knife guards and preferably the position where the blades lie intermediate two knife guards. The system can be halted by either a physical stop member at the required position or by detecting the position of the sickle bar during operation and causing it to halt the required position. The detection can be carried out by counting pulses generated by markers on a rotary member of the drive system.