BOTTOM AUGER HAVING SHEAVES WITH ADJUSTABLE WIDTH

摘要

PURPOSE: A lower auger for adjusting the gap of a pulley is provided to enable automatic arrangement to accord the pulley gap of a saw sheave due to a wire tension by including a connection unit. CONSTITUTION: A lower auger for adjusting the gap of a pulley comprise first and second pulleys(110a,110b), and a connecting unit(140). The first and the second pulley are arranged on an upper side(120) at regular intervals, wherein wire hangs inside. A wire is expanded from the saw sheave. The saw sheave is formed at the upper end of the reader in an auger drilling device. The fixed bracket is projected from and fixed to the upper side. The rotary shaft connects the first and second pulleys to enable the adjustment of angles.