| 摘要 |
<p>In accordance with the invention a method in wich N.C. machine is provided to cut sheet material like cloth, paper, cardboard, plastic, plywood, wood and similar chelt materials with a thickness of up to 15 mm. The raw material can be available in the roll form or in laminate planar form. …<??>To feed material from the roll to the cutting area a motorized support is provided, in the way to prevent the material from stretching or being distorted before being cut in the table. …<??>In order to have maximum througput from the machine, the cutting table is a conveyor made of an air and gas permeable material, and divided in three areas; feeding, cutting and removing area. Means are provided for the conveyor to prevent it to move during cutting time and to be moved by the X arm without changing the position to each other during feeding operation. …<??>In each of the cutting and removing areas is an X-Y computer controlled assembly. In the cutting area a plasma jet cutter managed by the X-Y assembly in that way that is posible for the cutting beam to reach every point of the surface. The power suply and the tank for the gas to be transformed in plasma are in a stationary position and the beam path is conveniently protected. The lower side of the feeding and cutting area is covered by a cage from wich air is continuously removed in order to prevent motion of the material to be cut and in order to remove smoke and ofher products that result from the cutting process. Another motive for this cage is to provide means to disipate the energy of the plasma jet beam. …<??>In the removing area is placed another X-Y computer controlled assembly with a head provided with a labelling and a suction device in order to automatically label and pick-up the cut parts and bring them to a storage area. …<??>Since normally the minimum length of the marker necesary to make a complete suit is about 5 to 7 m., and, due to the simultaneity of the cutting and removing operation the lenght of the two areas must be the same, a machine to be able to cut the entire marker at once would result extremely long. To avoid the problem, the sistem we are dealing with is provided with a control to cut the marker by sections, normally named "windows" but, and this is very important, "variable windows" in order to cut the patterns falling completely into the cutting area. That is why here, is enough to have the length of the window a little bit bigger that the biggest part to be cut.</p> |
