Apparatus for machining variable trim line of panel

An apparatus for cutting a trim line that is variable based on an assembly specification of a panel, the apparatus comprising:

• a lower die steel which serves to cut the panel along the trim line;
• an upper die steel which is lowered to be fit into the lower die steel to trim the panel;
• an upper die unit attached to the upper die steel and including
• (i) a select retainer to selectively punch the trim line of the panel depending on whether or not a variable notch portion in the panel is required for a assembly specification, and
• (ii) an upper punch to be moved forward and backward by the select retainer;
• a lower die unit a attached to the lower die steel so that in operation the lower die unit is movably operated in a direction opposite the upper die unit, the lower die unit including a lower punch that acts as a corresponding counterpart to the upper punch on the opposite side of the panel upon initiating a punching operation of the upper punch to cut the notch portion when the upper punch is moved forward at the same time;
• and
• a gas tank disposed behind the lower punch and configured to both
• (i) support the lower punch to prevent the lower punch from being pushed backward by a trimming force which occurs while a non-variable portion of the panel is being trimmed when the variable notch is not required in the trim line of the panel and
• (ii) be elastically movable so as to provide an ejecting force to the lower punch to eject a scrap piece caught in the lower die steel when the variable notch is required in the trim line of the panel.