| 摘要 |
PROBLEM TO BE SOLVED: To provide a spray gun for sand blasting capable of repeatedly using a stencil and eliminating masking time and labor and the necessity of installing a chamber. SOLUTION: Close to the tip of a sand nozzle 3, a sand cylinder 7 covered with an outer cylinder 5 is attached outward from the hole 4 of a suction box 1, a mouthpiece 8 is fitted in the tip of the outer cylinder 5 by providing a gap with the tip of the sand cylinder 7, and a stencil 9 is stuck to this mouthpiece 8. Thus, the stencil 9 is repeatedly used, the time and labor of masking and the necessity of installing a chamber are eliminated, and by sucking abrasives sprayed to a cup 10 to a suction route 18 between the outer cylinder 5 and the sand cylinder 7 and eliminating these, the machining efficiency of a dull surface is increased.
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