求翻译：可以三个方向装卸工件。克服了龙门式机床只可以从两端上料以及毛坯材料尺寸受限制缺点，运行过程中不会出现龙门式机床的两边丝杠进给误差而导致机床损坏和不能保证切割精度的现象发生是什么意思？

Three directions of loading and unloading workpieces. Overcome gantry machines on both ends can only size restricted materials and rough material shortcomings, gantry machine does not appear in the process of running on either side of the screw feeding machine is damaged as a result of error, and does not guarantee precision cutting phenomenon