Abstract: A protection device is provided for a machine which works sheet shaped material to stop the displacement of the machine when the protection device encounters an obstacle. The machine includes clamps which are displaced by the machine and which hold the material. The protection device includes two blades arranged parallel to each other and disposed on the machine in a loop shape surrounding each clamp. The two blades form a pair of normally open contacts of which at least the outer blade is flexible and resiliently deformable to allow the blades to be brought into contact with each other and close the contacts when the outer blade encounters the obstacle. A stop device is coupled to the normally open contacts to stop the displacement of the machine when the contacts are closed.

Abstract: An arrangement for withdrawing particles of material removed by a working tool of a machine tool during a machining process, comprises a working frame adapted to support a machine tool, casing forming an at least partially closed chamber adapted to surround the working tool so as to accommodate the particles of material removed during machining process, port elements communicating with the chamber and adapted to be connected to a suction source so as to aspirate the particles from the chamber, and mounting elements for mounting the casing on the working frame so that the chamber surrounds the working tool when the machine tool is supported by the working frame.

Abstract: A sewing machine is provided with a safety device which protects an operator's fingers from the needle and includes a ring suspended over the presser foot of the machine. The suspended member is movable by finger pressure applied thereto in any direction and when so moved, completes an electric circuit to shut off the machine.