Abstract: A method of cutting metal materials and non-metal materials in a non-combustible gas atmosphere, the method including forming a non-combustible gas atmosphere, providing the non-combustible gas atmosphere to at least one of a cutting part of a machine tool and an area adjacent to the cutting part, and machining the metal materials and the non-metal materials using the cutting part, and where the non-combustible gas includes one of nitrogen gas and carbon dioxide gas, and where the non-combustible gas occupies a proportion of at least 90% of the non-combustible gas atmosphere.

Abstract: On a work machine such as a milling machine having a main spindle for chucking a tool and a mobile transfer arm assembly for replacing the tool under control by a numerical control device, a chucking repeat controller including a chucking repeat fixer, which is given in the form of either a counter or a time-limit timer, automatically repeats chucking operation by the main spindle upon detection of any failure in chucking operation, and intercepts all further operation of the main spindle and the transfer arm assembly for maintenance purposes when failure in the chucking operation has been repeated in succession for prescribed number of times, preferably with concurrent generation of some visible and/or audible alarm for operators' attention.

Abstract: A tool transfer assembly for automatic milling machines perform rapid but stable replacement of a tool on a spindle head under direct control by a cam groove formed in an axially turnable and vertically movable shaft operationally related to holding jaws for tool holders while effectively utilizing power derived from two pneumatic power sources, thereby avoiding dissipation of the power conventionally caused by dividing it during transmission.

Abstract: A weft ejection nozzle for water jet looms is provided with a flow controller incorporated therein while embracing the nozzle main body in such an arrangement that the operating fluid from a given supply source is rendered to flow, in the first place, centripetally towards the periphery of the nozzle main body, to flow, in the second place, axially along the periphery of the nozzle main body, both being in the form of several flows separated from each other and being free of mutual interference, and to flow, finally, collectively and convergingly towards the weft ejection terminal of the nozzle, whereby the flow of fluid is so rectified as to entrain the weft for insertion into open sheds with increased propelling force.

Abstract: On shuttleless looms on which wefts are inserted into sheds being carried on air or water jet flow, the leading end of the inserted weft is urged sideways to move forward across a detecting zone of a photoelectric detection mechanism fixed forward of the cross-fell line by a pair of forks on the lathe which assume a position forward of the cloth-fell line at the very moment of cloth-fell beating and is held in a limited space on the forward side of the detecting zone, thereby non-contact type photoelectric detection of success in weft insertion being practiced without faulty double detection to be caused by whipping of the weft end. For water jet looms, occurence of noises in the detection to be caused by wetting can be prevented by provision of pneumatic air blowing devices, and waterproof sheltering arrangements for the photoelectric system that permits the passage of light as well as the passage of the weft end.