Electric Nailing Machine Continuous Driving Mechanism
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Solution Overview
Problem
Existing electric nailing machines require a delay before nails can be driven sequentially after the trigger is pulled, and they lack the ability to adjust driving force according to nail length or thickness, limiting their versatility in handling different types of nails.
Innovation Solution
The nailing machine incorporates a cylinder unit with a piston and driving rod, a driving spring, and a moving unit that converts rotary motion from an electric motor into linear motion. This setup allows for immediate sequential driving of nails and includes a driving-force adjustment unit that adjusts push-out resistance to accommodate different nail lengths and thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a clutch mechanism is used to delay engagement of the flywheel with the driven shaft, then the flywheel can rotate at constant speed before power transmission, but a time delay occurs before the nail can be driven after the trigger is pulled
Solution Approach 1:
The clutch mechanism is removed from the system. Instead of using a clutch to delay engagement, the patent directly couples the motor's rotating shaft to the driven shaft through a belt transmission system, eliminating the time delay while maintaining flywheel rotation stability through the belt's slip characteristics and the driven shaft's inertia.
Solution Approach 2:
A belt transmission system is introduced as an intermediary between the motor's rotating shaft and the driven shaft. This belt mechanism allows for smooth power transmission without the need for clutch engagement, enabling continuous operation and eliminating the time delay while maintaining system stability.
2Device complexity
If a constant driving force is applied to drive the nail, then the driving mechanism is simple, but the driving force cannot be adjusted according to nail length or thickness
Solution Approach 1:
The driving force is made dynamically adjustable through a spring-loaded piston mechanism. The spring constant and pre-compression can be adjusted to provide different driving forces, allowing the system to adapt to various nail types (different lengths and thicknesses) while maintaining a relatively simple overall structure.
Solution Approach 2:
The driving force parameter is made variable through an adjustable spring mechanism. By changing the spring compression or selecting different spring constants, the system can provide appropriate driving force for different nail specifications without requiring complex multi-component adjustment mechanisms.
3Ease of operation
If a flywheel with clutch mechanism is used for power transmission, then the motor can be ON/OFF controlled by a trigger switch, but sequential nail driving cannot be achieved due to the engagement delay
Solution Approach 1:
The clutch mechanism is removed from the system. The patent uses direct belt-driven coupling between the motor shaft and driven shaft, allowing the motor to continuously drive the system whenever activated. This eliminates the engagement delay and enables sequential nail driving while maintaining easy trigger control operation.
Solution Approach 2:
The belt transmission system enables continuous power transmission from the motor to the driven shaft without interruption or engagement delay. Once the motor is activated by the trigger, the useful action (driving the nail) continues seamlessly, enabling high-productivity sequential nail driving while maintaining ease of operation.
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 machine enables immediate sequential driving of nails without delay, and the adjustable driving force allows it to handle various nail types, improving operational efficiency and versatility.
Implementation Method 1
a cylinder cap (12b) formed of an elastic member
Implementation Method 2
a driving spring (15) which biases the piston (13) in a driving direction
Implementation Method 3
the power converting means has a sector gear (21) which is rotated/driven by the electric motor (17) and a rack gear (22) which is meshed with the sector gear (21) and is mounted on the piston (13)
Data Source
AI summary
An electric nailing machine capable of continuous driving is provided.A driving unit 10 which drives a nail N supplied to a driving position a includes a cylinder unit 11 having a cylinder 12 and a piston 13, a driving rod 14 which is consecutively provided on the piston 13 and slidably penetrates a cylinder cap 12b, a driving spring 15 which biases the piston 13 in a driving direction, and a moving unit 16 which moves the piston 13 in a counter-driving direction against a biasing force of the driving spring 15 and has a brushless motor 17 and power converting means 18 which converts a rotary motion of the brushless motor 17 to a linear motion in the counter-driving direction of the piston 13, in which the power converting means 18 has a sector gear 21 rotated/driven by the brushless motor 17 and a rack gear 22 meshed with the sector gear 21 and mounted on the piston 13, in which, when the piston 13 moves to a predetermined position in the counter-driving direction, meshing between the sector gear 21 and the rack gear 22 is disengaged.