Pressing Roller Mechanism for Compact Driving Tool
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Solution Overview
Problem
The existing driving tools require a significant space for the swingable roller assembly, leading to increased size due to the need for the roller to swing and prevent the driver from returning to its initial position effectively.
Innovation Solution
A driving tool design featuring a pressing mechanism with rotatable and linearly movable pressing rollers, supported by a conical coil spring, which changes position relative to the driver between the nail-driving and return processes, allowing for efficient energy transmission and preventing the rollers from inhibiting the driver's return, thus reducing the overall size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the roller assembly is made swingable to allow the roller to press the driver during forward movement and prevent inhibition during return, then the driver can be effectively pressed and returned, but a significant space is required for the swing motion, leading to increased machine size
Solution Approach 1:
The pressing roller is made movable in the rotation axis direction rather than swingable, allowing it to dynamically adjust its position to press the driver during forward movement and retract during return, resolving the contradiction between effective pressing and compact size
Solution Approach 2:
The solution changes the motion dimension from swing motion (requiring lateral space) to linear movement along the rotation axis direction, enabling the roller to achieve pressing functionality while maintaining a compact overall machine size
2Ease of operation
If the roller assembly swings rearward during driver return to prevent inhibition, then the driver can return smoothly, but the swing mechanism increases device complexity
Solution Approach 1:
The pressing roller is designed to move linearly along the rotation axis direction rather than swing, simplifying the mechanism while still allowing it to retract during driver return to prevent inhibition, thus reducing device complexity
Solution Approach 2:
The complex swing mechanism is replaced by a simpler linear movement mechanism, extracting the essential function of preventing roller inhibition during return while eliminating the complexity of swing motion
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
The solution enables efficient transmission of rotational energy to the driver for nail-driving while preventing the rollers from obstructing the return process, thereby maintaining a compact size and simplifying the mechanism.
Implementation Method 1
The pressing mechanism includes a first biasing part and at least one pressing roller. The at least one pressing roller is supported to be rotatable around a second rotation axis and to be movable in an extending direction of the second rotation axis. The at least one pressing roller is configured to press the driver toward the flywheel by a biasing force of the first biasing part
Implementation Method 2
the driver and the flywheel are frictionally engaged with each other and rotational energy of the flywheel is transmitted to the driver
Data Source
AI summary
A nailing machine includes a tool body, a flywheel (40), a driver (3), a pressing mechanism and a return mechanism. The pressing mechanism includes a spring mechanism and a pressing roller (87). The pressing roller (87) is supported to be rotatable around a rotation axis (A2) and movable in a left-right direction, and configured to press the driver (3) toward the flywheel (40) by a biasing force of the spring mechanism in a nail-driving process in which the driver (3) moves from an initial position to a nail-driving position, to thereby enable transmission of the rotational energy to the driver (3). The pressing mechanism is configured such that the position of the pressing roller (87) relative to the driver (3) changes in the left-right direction between the nail-driving process and a return process, thereby making it impossible for the pressing roller (87) to press the driver (3) in the return process.