| 摘要 |
A sheet length control system for use in connection with a material feeding and material processing apparatus to maintain uniform treatment of the material as processed by the processing apparatus within a predetermined and desired tolerance. Such material processing apparatus is exemplified in the use of a cutoff machine to cut into equal desired sheet lengths a continuously moving web of material. Digitizer means are used to produce signals the ratio of which is representative of the desired sheet length and the amount that the ratio of the signals varies from the desired sheet length ratio is used to produce an error signal indicative of whether the sheet length cut is shorter or longer than the predetermined sheet length value. Error band selective means receives the error signal produced to produce a signal characteristic of the error magnitude. Means are provided to be responsive to the error band selective signal for correcting the sheet length to correspond to the predetermined sheet length value within an acceptable tolerance. |
