scarfing-machine

from The Century Dictionary.

• noun A machine for shaving the ends of leather belting to a feather-edge where they are to be lapped to form a joint.
• noun A machine for shaping the ends of a wire or rod so that they may be joined by a scarf-joint, using either welding, soldering, brazing, or any other process which may be convenient for making the two pieces one. The two ends are formed into half wedges, so that when placed together the joint line makes an acute angle with their common axis.