Fastener Driving Tool Auxiliary Tooth Guidance
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Solution Overview
Problem
Conventional fastener driving tools face issues where the feed teeth may fail to pick up fasteners when they have moved onto the shaft portion, leading to incomplete closure of the injection passage, potentially causing the driven-out fastener to deviate from the passage.
Innovation Solution
A fastener driving tool with a feed member that includes both a feed tooth for engaging and feeding fasteners and an auxiliary tooth positioned on the foot side to prevent deviation, where the auxiliary tooth projects further into the supply passage than the feed tooth, ensuring the fastener remains within the injection passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the feed member oscillates in the retreat direction to prevent engagement with connected fasteners, then the feed member can retreat smoothly, but the clearance between the feed tooth and supply passage increases, causing insufficient guidance of the driven-out fastener
Solution Approach 1:
The feed member is segmented into two distinct functional teeth: the feed tooth for engaging and transporting fasteners, and the auxiliary tooth for guiding and closing the injection passage. This segmentation allows each component to specialize in its function, with the auxiliary tooth specifically dedicated to maintaining guidance precision regardless of the feed member's oscillation state.
Solution Approach 2:
The auxiliary tooth acts as an intermediary element between the feed member and the injection passage. It provides continuous guidance and closure of the injection passage, mediating the interaction between the oscillating feed member and the fastener, ensuring stable guidance even when the feed tooth's engagement is compromised.
2Productivity
If the feed tooth moves onto the shaft portion of the fastener, then the fastener can be fed forward, but the clearance between the feed tooth and supply passage becomes larger, allowing the fastener to deviate from the injection passage
Solution Approach 1:
By dividing the fastener engagement function into two separate teeth - the feed tooth for propulsion and the auxiliary tooth for alignment - the system achieves both high feeding efficiency and reliable alignment. The auxiliary tooth's extended projection ensures continuous guidance throughout the feeding process.
Solution Approach 2:
Different parts of the feed member have different functional qualities: the feed tooth is designed for engagement and movement, while the auxiliary tooth is designed for guidance and alignment. This local differentiation of function allows each part to optimize its performance for its specific purpose.
3Reliability
If the auxiliary tooth projects further into the supply passage than the feed tooth, then the injection passage is effectively closed and fastener deviation is prevented, but the device complexity increases
Solution Approach 1:
The auxiliary tooth is merged with the feed member as an integrated component rather than a separate part. This combining approach achieves the dual function of feeding and guiding within a single feed member structure, avoiding the complexity of additional independent components while maintaining high alignment reliability.
Solution Approach 2:
The feed member is designed with multi-functionality, where the same component performs both the feed tooth function (engaging and transporting fasteners) and the auxiliary tooth function (guiding and closing the injection passage). This multi-functionality reduces the number of separate components needed in the system.
Data Source
AI summary
A fastener driving tool includes a nose portion, a supply passage and a fastener supply mechanism. The nose portion includes an injection passage for injecting a fastener. The supply passage is connected to the injection passage. The fastener supply mechanism feeds connected fasteners to the injection passage. The fastener supply mechanism includes a feed member which advances and retreats in a feed direction and which oscillates in a direction to retreat from the supply passage. The feed member includes a feed tooth which feeds the fastener to the injecting passage by engaging with a rear portion of the fastener and an auxiliary tooth which is disposed on a foot side of the fastener to prevent the fastener from deviating from the injection passage. When the feed tooth of the feed member projects into the supply passage, the auxiliary tooth projects into the supply passage longer than the feed tooth.