| 摘要 |
The present invention relates to a four-hole drilling machine. The four-hole drilling machine comprises: a pair of drilling units composed of a rotary shaft rotated by an operation of a motor, a pair of gear boxes connected to the rotary shaft and operated by a rotation of the rotary shaft, and arranged to be separated at a predetermined interval, and a pair of cores extended from an internal space of the pair of the gear boxes and connected to face upward; and a lifting unit installed in a lower side of the pair of the drilling units, supporting the drilling units, and controlling the heights of the drilling units. According to the present invention, four holes is able to be punched at the same time using two-hole drilling machines. |
