During the operation of offset printg machine, each link is for the safety and orderly transfer, design and research of "paper". The control link of paper feeding and the height of paper supplying should be maintained in a constant condition. Paper feedng station is capable of automatically and manually rising and failing, and in the feeding process to check the paper before its arrival that is in the state of early, late, askew, cutaway, crimping, out of paper and other states. The "paper" photoelectric detection will or- der the front lay to stop swinging transmission when being abnormity, so as to prevent paper into the cylinder again and occurs the su- perimposed accumulation of Daner sheets which is so-ca]l,vt "nl,l~, m,," ~.,~ ,~h ~o%在胶印机运行过程中，每个环节都为“纸张”的有序安全传榆而设计与运筹。输纸控制环节，供应纸张的纸面高度要保持恒定，给纸台能够自动和手动升与降，在送纸过程中要检测纸张到达前规是早、迟、歪斜、缺角、卷边、缺纸等状态，有异常时“纸张”的光电检测马上命令前规停止摆动传输，以防纸张再进入滚筒使多张纸积累叠加出现“塞炮”等事件的发生。
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