Compact Electric Stapler with Unitized Housing and Spring-Energized Drive
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Solution Overview
Problem
Existing electric staplers are bulky, inefficient, and prone to unpredictable operation due to sensitive switch placement and complex structures, which affect their usability and cost-effectiveness.
Innovation Solution
A compact, spring-energized electric stapler with a unitized housing that integrates both the external enclosure and internal support frame, featuring a gear motor power train with a low-profile lever and elongated power spring assembly, and an adjustable center-mounted sensor switch for improved usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a gear motor power train with spring energy storage is used, then the stapler size is reduced and efficiency is improved, but the device complexity increases
Solution Approach 1:
The spring is pre-loaded during the forward stroke to store energy, which is then released during the return stroke to drive the staple ejection. This preliminary energy storage action allows the system to achieve high power output during the critical ejection phase without requiring a continuously high-power motor, thereby reducing overall device size while maintaining effective stapling capability.
Solution Approach 2:
The power train operates in periodic cycles: the motor drives the gear train during the forward stroke to load the spring, then the spring releases stored energy during the return stroke to eject the staple. This periodic operation allows the system to concentrate power delivery into brief high-intensity pulses rather than continuous operation, enabling compact design while maintaining stapling effectiveness.
2Ease of manufacture
If a side mounted switch is used to facilitate manufacture, then manufacturing cost is reduced, but the stapler operation becomes sensitive to paper angle and reliability decreases
Solution Approach 1:
The center-mounted switch serves multiple functions: it detects paper presence, determines paper angle, and triggers the stapling cycle. By positioning the switch at the center rather than the side, it becomes the universal reference point for all paper insertion angles, eliminating the angle sensitivity problem while maintaining manufacturing simplicity through a single switch configuration.
3Strength
If a double walled construction with separate support frame and housing is used, then structural strength is improved, but the device complexity and size increase
Solution Approach 1:
The housing is designed to perform dual functions: it serves as both the external enclosure and the internal support frame structure. By merging these two previously separate components into a single integrated housing, the design eliminates the complexity of assembling and aligning separate frames while maintaining the necessary structural strength to support the power train and guide the stapling mechanism.
Solution Approach 2:
The housing material and structure are designed to simultaneously provide mechanical support, structural strength, and external enclosure functions. This multi-functional design eliminates the need for separate support frames while maintaining adequate structural integrity for the stapling 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 solution results in a more efficient, compact, and cost-effective electric stapler that minimizes noise transmission, reduces the dependency on paper angle for stapling, and provides improved reliability and user expectations.
Implementation Method 1
gear motor type, with spring energy storage
Implementation Method 2
The power spring is deflected and energized in a rest position
Implementation Method 3
A cam roller mounted to a final gear holds down the rear of the lever until the system is activated
Implementation Method 4
gear motor type
Data Source
AI summary
A compact, electric, spring energized desktop stapler having a unitized housing providing both an external movable enclosure and a support frame for internal parts is disclosed. The internal power train is preferably elongated with the motor at the rear, a gear set toward the center, and low profile lever and power spring assembly at the front. The lever engages a striker with a normal upper rest position where the power spring is deflected and energized. A cam roller mounted to a final gear holds down the rear of the lever until the system is activated when the final gear rotates and the cam roller rolls off the end of the lever. In the unitized body, the base is pivotally attached to the body at the rear. A base lever selectively links to a cam roller or equivalent structure to move the body downward toward the base during a cycle.