公开(公告)号：US4110925A

公开(公告)日：1978-09-05

申请号：US782027

申请日：1977-03-28

申请人： Neal T. Strand ,  Richard J. Esboldt

发明人： Neal T. Strand ,  Richard J. Esboldt

IPC分类号： G09F11/00 ,  G09F11/29

CPC分类号： G09F11/29 ,  G09F2011/0063 ,  G09F2011/0072

摘要： A sign cabinet having a scroll movably mounted on rollers for movement past a display opening in the cabinet. A torsion spring acts on one of the rollers to compensate for differences in the rate of movement of the scroll at the two rollers. An electronic control circuit automatically senses the position of the scroll and is actuated by the position information for controlling the operation of the scroll. The modes of operation include: continuously moving back and forth between preselected end points within the scroll; moving back and forth within a predetermined section within the end points, stopping at preselected frames within the section; and, advancing from one frame or section to another.