| 摘要 |
A staple-driving gun includes a hollow housing configured with first and second air chambers separated by a partition. A piston unit includes an operating member connected fixedly to a sleeve disposed movably in the first air chamber, and a piston rod disposed movably in the sleeve. The operating member is operable so as to move a valve end portion of the sleeve away from the partition. Hence, compressed air flows from the first air chamber into the second air chamber via a valve hole in the partition, and an air-excluding passage constituted by a gap between the valve end portion of the sleeve and an annular flange of a seal washer mounted on the valve end portion of the sleeve, and an air-excluding hole in the valve end portion of the sleeve so as to urge the piston rod to move toward a staple-discharging member.
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