IBM 6400-I15 Maintenance Manual - Page 41
Paper Transport Asm, Paper Transport System
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Paper Transport System Horizontal Adjustment Knob Tractor Support Shaft Tractors Paper Path Splined Shaft Vertical Adjustment Knob and Splined Shaft Pulley Shuttle Cover Assembly Paper Supports Paper Feed Timing Belt (Under the cover) Figure 13. Paper Transport System A two-phase DC stepper motor, directed by the EC on the controller board, drives two tractor sprockets by means of a toothed belt and splined shaft pulley arrangement. The stepper motor permits extremely accurate incremental vertical paper movement. This drive configuration is designed for continuous, fan-folded paper three to 17 inches wide and one to six sheets thick. For reverse paper feeding, the platen open motor opens and closes the platen via a toothed belt. Opening the platen prevents paper jams when paper direction is reversed-that is, paper is moved downwards-in order to view the print area, set top of form, or allow applications to overprint forms. Paper is positioned horizontally using the tractors and the horizontal adjustment knob. Each tractor engages paper perforations with six sprocket pins and locks in place with a friction lock. The horizontal adjustment knob allows vernier positioning of the left print margin. Paper can be positioned vertically by hand with the vertical adjustment knob. Principles of Operation 41