O RING FOR VIBRATION PEN, AND VIBRATION PEN FOR MARKING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an O ring for a vibration pen, easy in visually determining its abrasion status.

SOLUTION: The O ring 10 is provided at a sliding part between a cylinder chamber supplied with compressing air and a piston provided to be able to reciprocate in the cylinder chamber. The O ring 10 for a vibration pen is covered with a colored film 10b having a color different from a material of the O ring 10.

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