Follower Claw Latch Mechanism for Nail Fastener Tool Magazine
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Solution Overview
Problem
Existing fastener-driving tools require manual operation to move the follower mechanism to a rearward position for dry-cycle firing or clearing jammed fasteners, which is awkward and leads to increased production downtime and operator fatigue, as the spring-biased mechanism tends to return to the forward position.
Innovation Solution
A new follower mechanism with a latch-hook on the follower claw that engages an undercut region of the magazine end cap, allowing the mechanism to be retained in a rearward position, enabling both hands to be free for dry-cycle operations or jam clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the follower mechanism is manually moved to a rearward position for dry-cycle firing or clearing jammed fasteners, then the operator can perform maintenance operations, but the operator experiences increased effort and production downtime
Solution Approach 1:
The latch mechanism enables the follower mechanism to self-retain in the rearward position without requiring continuous manual operation. The latch-hook automatically engages with the undercut region of the magazine end cap when the follower is moved rearward, allowing the system to maintain the maintenance position autonomously and freeing the operator from continuous manual intervention.
Solution Approach 2:
The latch mechanism is pre-configured to engage automatically when the follower mechanism is moved to the rearward position. The latch-hook is positioned to engage with the undercut region of the magazine end cap before the operator needs to perform dry-cycle firing or jam clearance operations, preparing the system in advance for maintenance activities.
2Reliability
If the spring-biased follower mechanism is allowed to return to the forward position automatically, then the fastener supply is maintained, but the operator cannot perform dry-cycle firing or jam clearance operations
Solution Approach 1:
The system dynamically switches between two states: normal operation state where the spring biases the follower forward to maintain fastener supply, and maintenance state where the latch mechanism holds the follower rearward to enable dry-cycle firing or jam clearance. The operator can transition between these states by manually actuating the latch, providing flexibility in operation modes.
Solution Approach 2:
The latch mechanism acts as an intermediary between the spring-biased follower mechanism and the magazine end cap. It mediates the interaction by providing a controlled engagement point (latch-hook engaging with the undercut region) that allows the follower to be held in the rearward position against the spring's forward biasing force, enabling maintenance operations while maintaining the fastener supply system.
3Ease of operation
If the follower mechanism is held in a rearward position using a latch mechanism, then both hands are free for operations, but the device complexity increases
Solution Approach 1:
The latch mechanism is segmented into distinct functional components: the latch-hook integrated into the follower claw, the undercut region in the magazine end cap, and the spring-biased follower mechanism. This segmentation allows each component to perform its specific function independently, simplifying the overall design while achieving the desired hand freedom for operations.
Solution Approach 2:
The latch-hook is merged with the follower claw as an integrated component rather than a separate mechanism. This merging reduces the number of parts and simplifies the overall device complexity while still providing the necessary function of holding the follower in the rearward position. The latch-hook is formed as part of the follower claw structure, eliminating the need for additional latching components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates easy dry-cycle firing and fastener jam resolution by allowing the follower mechanism to be securely held in a rearward position, reducing operator effort and downtime.
Implementation Method 1
a coil spring which pivotally biases the follower claw toward the position at which the follower claw can engage the trailing one of the nail-type fasteners
Implementation Method 2
a follower body which is normally spring-biased in the forward direction so as to, in turn, normally bias a supply of nail-type fasteners in the forward direction
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A follower mechanism of the bypass type comprises a follower body which is normally spring-biased in the forward direction so as to, in turn, normally bias a strip supply of nail-type fasteners in the forward direction toward a discharge path along which the leading one of the nail-type fasteners will be driven and discharged out from the fastener-driving tool. A follower claw is normally spring-biased, around the pivotal axis of a pivot pin mounted upon the follower body, to a position at which the follower claw can engage the trailing one of the nail-type fasteners so as to bias the supply strip of nail-type fasteners in the forward direction. A latch-hook is integrally provided upon the follower claw for engaging an undercut region of the fastener-driving tool magazine end cap in order to retain the entire follower mechanism at a rearwardly retracted position within the magazine assembly of the fastener-driving machine.