Nailer Control Circuit Dynamic OFF Time for Misfire Prevention
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Solution Overview
Problem
Nailers often experience misfires due to repeated triggering in both single and continuous fire modes, leading to unintended nailing, which can be mitigated by lengthening the OFF determination time but results in operational lag and decreased operability.
Innovation Solution
A working tool with a control circuit that differentiates between ON and OFF positions for two operation units, employing distinct OFF determination times in single and continuous fire modes to prevent misfires while maintaining operability, by ensuring the drive source is only activated when both units are determined to be in their respective OFF positions for a set duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the OFF determination time is lengthened to prevent misfire, then the reliability is improved, but the operability deteriorates due to time lag
Solution Approach 1:
The patent applies dynamics by making the OFF determination time variable rather than fixed. The control circuit dynamically adjusts the OFF determination time based on the detected nailing state: using a first (longer) OFF determination time when nailing is detected to prevent misfire, and a second (shorter) OFF determination time when no nailing is detected to maintain fast response. This dynamic adjustment resolves the contradiction between reliability and operability.
2Reliability
If the OFF determination time is lengthened to suppress unintended nailing, then the misfire is prevented, but the response time increases
Solution Approach 1:
The control circuit dynamically changes the OFF determination time period based on the nailing state detection. When nailing is detected, a longer first OFF determination time is used to ensure accurate detection and prevent unintended nailing. When no nailing is detected, a shorter second OFF determination time is used to maintain fast response. This dynamic adjustment resolves the contradiction between nailing accuracy and response time.
3Device complexity
If the control circuit uses a fixed OFF determination time, then the control logic is simple, but it cannot simultaneously prevent misfire and maintain fast response
Solution Approach 1:
The control circuit implements dynamic adjustment of the OFF determination time based on nailing state detection, using a first OFF determination time when nailing is detected and a second OFF determination time when no nailing is detected. This dynamic approach enhances misfire prevention capability while maintaining acceptable control logic complexity through state-based conditional branching.
Solution Approach 2:
The patent changes the parameter of OFF determination time based on the detected nailing state. By switching between a first OFF determination time period and a second OFF determination time period according to whether nailing is detected, the system optimizes both misfire prevention and response time without requiring complex control logic.
Data Source
AI summary
A nailer for suppressing misfire while keeping operability. In a first mode, a control circuit drives a drive source when a second ON determination is made and a first ON determination is made in a state where a second operation unit is maintained at a second ON position, and when the drive source is driven and then a second OFF determination is made in a state where a first operation unit is maintained at a first ON position, the control circuit does not drive the drive source again unless returning to the initial state. In a second mode, the control circuit drives the drive source when the first ON determination is made and the second ON determination is made in a state where the first operation unit is maintained at the first ON position. A second OFF determination time in the second mode is longer than in the first mode.