Sheet feeding or delivering – Feeding – By means to convey sheet
Patent
1994-08-08
1995-11-14
Skaggs, H. Grant
Sheet feeding or delivering
Feeding
By means to convey sheet
271268, 271270, 271272, 271176, 271 81, 271 85, B65H 702
Patent
active
054659558
ABSTRACT:
An external media transport buffer has a carriage supported for linear motion on parallel guide rails between an imagesetter and a processor. A pair of transport rollers is mounted for rotation on the carriage. Two sensors are mounted within the buffer to detect media movement. A first sensor is positioned at an entrance to the buffer and a second sensor is positioned on the carriage on an exit side of the transport rollers. Signals are sent from the sensors to a roller transport motor and carriage transport motor and the signals are coordinated to start and stop the motors according to a predetermined sequence. A leading end of media enters the nip of the transport rollers and is held in the nip as the carriage travels from the imagesetter to the processor. A slack loop of media forms between the carriage and the imagesetter as the imagesetter feeds the media to the buffer faster than the carriage travels to the processor. A movable media guide is used in a first position to guide the media from the imagesetter into the nip of the transport rollers. As the carriage begins to travel away from the imagesetter and the leading end of the media is held in the roller nip, the movable guide drops down to a second position so that the slack loop may form easily and buckling and jerking of the media is avoided. Upon the trailing end of the media entering the buffer and a ready signal from the processor, the transport rollers deliver the leading end of media into the processor transport rollers. Upon complete removal of the media by the processor, the carriage returns to the imagesetter and the movable media guide returns to its initial position.
REFERENCES:
patent: 4580774 (1986-04-01), Yamaguchi et al.
patent: 5110104 (1992-05-01), Wakao et al.
Dornberger et al, Clutch-Brake Speed Control, Jan. 1976 Western Electric Technical Digest No. 41, pp. 7-8.
Krupica Libor
McElwain William L.
Bayer Corporation
Krolikowski Julie A.
Skaggs H. Grant
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