| 摘要 |
A stapler is provided with a frame and a head assembly pivotally disposed in the frame between a first open position and a second clamped position. The head assembly contains all of the operative elements of the stapler necessary to carry out a stapling operation and is biased toward the open position by a biasing member disposed between the head assembly and the frame. These operative elements include a staple driving mechanism, a motor fixed to the head assembly, a cam member connected to the motor and rotated thereby. The cam member contains at least three surfaces that simultaneously form and drive staples, pivot the head assembly in the frame, and actuate a microswitch controlling power to the motor. The cam member cooperates with a first bar disposed between the frame and a spring assembly to permit the first bar to flex to accommodate varying thicknesses or amounts of paper to be stapled. Fewer operative parts are need because the motor and cam member surfaces all rotate around parallel axes that are perpendicular to the axes about which the head assembly pivots.
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