MACHINE TOOL WITH DETACHABLE TOOL SHIELDING MEANS

摘要

A grinding machine wherein the spindle for one or more grinding wheels is at least partially surrounded by a two-piece protective device whose hood is secured to the machine frame and whose cover is detachable by a mechanism on a tool changing device which accepts grinding wheels from the spindle, which delivers such grinding wheels to a magazine and which attaches fresh grinding wheels to the spindle. The mechanism retracts the cover from the hood in the axial direction of the spindle as soon as a reciprocable carriage of the tool changing device assumes a tool changing position in front of the spindle. The bolts which normally lock the cover to the hood also serve for attachment of the cover to several studs of the mechanism, and such studs are movable by a fluid-operated motor to move the cover thereon in the axial direction of the spindle to and from a retracted position in which the cover is out of the way and the tool changing device is free to remove one or more grinding wheels from or attach one or more grinding wheels to the spindle as well as to move toward or away from the magazine.