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BACKGROUND OF THE INVENTION The present invention relates to a printed circuit board drilling machine and its maintenance method, and more particularly, to a printed circuit board drilling machine having a structure providing excellent operability and maintainability and a maintenance method for the printed circuit board drilling machine. Printed circuit board drilling machines in accordance with conventional techniques are large sized devices generally comprising, as principal constituents, a plurality of spindle motors respectively holding a drill and moving the drill upward/downward, and a table, carrying a plurality of printed circuit boards, moving in at least an X-direction. In use of such conventional printed circuit board drilling machine, it is necessary to perform maintenance work on the spindle motors and peripheral parts very frequently. Further, to prevent the risk of injury when the machine is in action, the entire machine is contained in a cover formed along the outer shape of the machine. As the above-described conventional printed circuit board drilling machine is a large sized device, an operator cannot reach the positions of the spindle motors unless the operator stretches himself/herself over the table holding the printed circuit board. Thus, the maintenance work on the spindle motors and peripheral parts requires a lot of labor, further, forces the operator to work in an unnatural posture. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a printed circuit board drilling machine which solves the drawbacks of the above-described conventional art and provides excellent operability and maintainability, and a maintenance method appropriate to the machine. According to the present invention, the foregoing object is attained by providing a printed circuit board drilling machine which sequentially makes a number of holes in at least one printed circuit board, placed on a table moved in at least an X-direction, by using a drill driven by a spindle motor, wherein an openable/closable door is provided in a front portion, wherein the door being separated into an upper door and a lower door, and wherein the upper door opens upward, while the lower door opens downward. Further, the foregoing object is attained by providing a printed circuit board drilling machine having the above construction, wherein a junction portion between the upper door and the lower door is projected to a position in front of a front surface of a base portion of the lower portion of the machine, further, the lower door covers at least a guide device having a table driving mechanism below the table. Further, the foregoing object is attained by providing a maintenance method for a printed circuit board drilling machine which sequentially makes a number of holes in at least one printed circuit board, placed on a table moved in at least an X-direction, by using a drill driven by a spindle motor, comprising the steps of: opening a door, separated into an upper door and a lower door, provided in a front portion of the machine such that the upper door opens upward and the lower door opens downward; and moving the table inwardly for maintenance with respect to inside of the drilling machine. Other objects and advantages besides those discussed above shall be apparent to those skilled in the art from the description of a preferred embodiment of the invention which follows. In the description, reference is made to accompanying drawings, which form a part thereof, and which illustrate an example of the invention. Such example, however, is not exhaustive of the various embodiments of the invention, and therefore reference is made to the claims which follow the description for determining the scope of the invention. Patent Storm. “Printed circuit board drilling machine and its maintenance method.” March 2, 2010 http://www.patentstorm.us/patents/6217265/description.html
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