Abstract: A sheet feeder having a platform for supporting a stack of sheets, a feed head assembly for feeding sheets seriatim from the top of a sheet supply stack on the platform, a mechanism for moving the platform relative to the feed head assembly, and a device for controlling operation of the platform moving mechanism. The control device for the platform moving mechanism includes a sensor for detecting marginal edges of sheets in the sheet stack on the platform, and producing a signal indicative of sheet edge detection. Additionally, a sensor is provided for detecting the location of the topmost sheet on the sheet stack on the platform, and producing a signal indicative of such top sheet location detection. A signal is set representative of the top of the sheet stack being in proper operative relation to the feed head assembly, this set signal being based on the signal from the top location sensor for the particular location of the top of the stack when the marginal sheet edge detection signal is first produced.

Abstract: A sheet feeder having a platform for supporting a stack of sheets, a feed head assembly for feeding sheets seriatim from the top of a sheet supply stack supported on the platform, a mechanism for moving the platform relative to the feed head assembly, and device for controlling operation of the platform moving mechanism. The control device determines a selected parameter of a stack of sheets supported on the platform and produces a signal corresponding thereto. The speed of the platform moving mechanism is then set based on the parameter signal.

Abstract: Copy finisher for assembling uncollated or collated copies produced by an electrographic copies into booklets in an intermediate tray, for stapling the booklets, if desired, and for selectively stacking the booklets in an offset or straight manner in an output tray. If a malfunction, such as a paper jam, occurs in the copier, the finisher will assemble the copies in process in the finisher into a booklet and offset stack the booklet in the output tray. If the number of copies in a copy set produced by the copier exceeds the copy assmebling limit of the intermediate tray, the finishing apparatus will assemble the copies of the set into subbooklets of copies equal to or less than the copy limit of the intermediate tray and stack all of the subbooklets of a copy set at the same location in the output tray.