Staples Push Unit for Tackers Using Gear-Rack Transmission
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Solution Overview
Problem
Conventional staple push units in power tackers experience friction-related wear between cylindrical cams and switch plates, affecting the precision of staple ejection due to significant force applied by springs.
Innovation Solution
A staple push unit design featuring a driving gear with teeth engaging a straight rack on a slide, where the spring board is directly engaged with the slide's notch, allowing precise staple ejection by storing energy and releasing it to drive the push plate towards the staple outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cylindrical cam is used to drive the switch plate, then the structure is simple, but friction wear occurs between the cam and switch plate affecting ejection precision
Solution Approach 1:
A rack is introduced as an intermediary component between the driving gear and the push plate. The rack converts rotational motion of the driving gear into linear motion of the push plate, eliminating direct friction contact between the cam and switch plate while maintaining structural simplicity. This mediator component resolves the contradiction by providing precise motion transmission without wear.
Solution Approach 2:
The cylindrical cam mechanism is replaced with a gear-rack mechanism. Instead of using a cam that relies on friction contact to drive the switch plate, the invention uses a driving gear with teeth that engage with the rack's teeth, converting the mechanical friction-based system into a positive engagement system that provides precise control over the push plate's motion without wear.
2Force
If a spring applies significant force to the switch plate, then the staple ejection power is sufficient, but friction wear increases between the cam and switch plate
Solution Approach 1:
The rack serves as a mediator that transmits the spring force from the push plate to the driving gear through positive engagement of teeth. This eliminates the friction-based force transmission between cam and switch plate, allowing the spring to apply significant force without causing wear, thereby maintaining both ejection power and component durability.
3Ease of operation
If the cam rotates smoothly, then the mechanism operates simply, but the friction wear affects the precision of staple ejection
Solution Approach 1:
The smooth rotating cam is replaced with a driving gear that rotates and engages with the rack's teeth. This substitution maintains the simplicity of rotational operation while eliminating friction wear through positive gear engagement, ensuring both ease of operation and precision of staple ejection.
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 stabilizes and precisionizes the staple ejection process by ensuring direct and stable transmission between the driving gear and the slide, reducing wear and enhancing the accuracy of staple discharge.
Implementation Method 1
the spring board is bent with movement of the slide. When the teeth of the driving gear are disengaged from the rack. The spring board bounces back and drives the slide and the push plate toward the staple outlet
Data Source
AI summary
A staples push unit of a tacker includes a guide plate located at a staple outlet of the tacker. A motor is located in the tacker and has an output shaft to which a driving gear is connected. A slide and a push plate connected to the slide are movably located in a slot in the tacker. A rack is formed at one side of the slide and engaged with the teeth of the driving gear. A spring board has one end engaged with one end of the slide. When activating the motor, the driving gear drives the rack to move the slide, and the spring board is bent. When the teeth of the driving gear are disengaged from the rack, the spring board bounces back and drives the slide and the push plate to eject a staple. The push plate is guided by the guide plate.