| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for sucking to return a liquid remaining in a nozzle with a simple structure. SOLUTION: A depressing head 20 is constituted of a head main body 21 having a sucking-to-return chamber 23 communicating with the nozzle 22 and a relay member communicating the sucking-to-return chamber with a pump chamber through a communicating passage 34 in the center. The end part of the relay member is formed into an elastically deformable tapered insert part 32 having a shape capable of being inserted into the middle of an inlet passage 24 having a tapered inner peripheral surface of the sucking-to-return chamber and the insert part of the relay part is pushed further into the inlet passage of the sucking-to-return chamber with the deformation by depressing the head main body. The insert part returned in the shape by the release of the depressing slides to be returned to the initial position in the inlet passage.
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