PROCEDIMENTO ED APPARECCHIATURA PER IL TRATTAMENTO INTERMITTENTE DI MATERIALI IN FOGLIO PARTICOLARMENTE MATERIALI IN FOGLIO SOTTOPOSTI AD OPERAZIONI DI DIAGRAMMATURA

摘要

In a plotter, an elongated strip of plotting paper extends between rolls at opposite ends of a plotting table to receive graphic information from a plotting instrument that is carried over the table by means of a motor controlled carriage. Different segments of the elongated strip are shifted onto the work surface of the table to receive the graphic information by coupling the strip to the plotting carriage and moving the carriage together with the strip across the table in an indexing operation. To prevent distortion of the material and associated positioning errors during the step of indexing, the material being pulled onto the table by the carriage is placed in tension and the material being discharged from the table is maintained substantially tension-free.