Importance

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Abstract

The machine tool provided with a machine frame adapted to be attachable to a stand, a pneumatic cylinder for reciprocating a quill on the machine frame, and a feed control device for controlling the forward moving speed of the quill comprising a hydraulic cylinder which is parallelly disposed to the quill and includes a piston assembly having a projecting portion engageable with the quill and a liquid tank. The quill is moved, until it is engaged with the projecting portion in the forward moving thereof, at a rapid feed speed and after the engagement at a controlled feed speed by the feed control device. The liquid tank has a pair of openings arranged such that either one of the two may constantly come under the liquid surface in the tank no matter in what posture the machine frame may be attached to the stand. The feed control device comprises a connecting device including two passages respectively communicated with each of the two openings and a joining device for selectively joining one of the two passages which is in communication with one of the pair of openings situated under the liquid surface with a cylinder chamber of the hydraulic cylinder.

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First Claim