Double-acting saw blade making machine - twists together two toothed metal strips suspended between spindles while heat is applied

摘要

The method of making an elongated saw blade (1) by twisting together two toothed metal strands, includes applying heat to the strands while they are being twisted. One end of the strands is connected to the hooked end (6) of a shaft (5) rotated by a drive gear (12) and the other end is connected to the hooked end of a stationary arm (13). The two arms are supported on uprights (4,8) at opposite ends of a base frame (2). The heating unit (3) is mounted on the frame between the uprights. Incorporated at the drive end of the rotating shaft is a clutch (7), and the drive is operated to give the required number of rotations for twisting the strands together. At the same time, the strands are raised to red heat. After twisting, the blade is allowed to cool down in air. An electrical resistance heating system can be used. A blade cutting in two directions can be made by the apparatus.