HP 2500c Service Manual - Page 128
from Post Cards to Super B-size
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Paper Paths and Components Star-wheel Spring It is a coil spring type loaded transversely. The objective is that the spring force is high enough to eject all the media supported and is low enough not to produce any star-wheel track marks or minimum marks within the acceptable level. Spring force (@ span 14.2 mm and deflection 1.5 mm) : 19 gm Deflection in assembled condition : 1.5 mm Allows additional deflection to accommodate paper thickness and other unusual operation (example: paper jam removal) : 1.2 mm Output Mechanism Output Ramps Four sets of ramps are used to support different media from Post Cards to Super B-size media during printing . This creates a bow-shape especially for media sizes B5,A, Letter, Legal by stressing the media thereby increasing the drying time to avoid smearing on the previous printed media. Ramp Profile The ramp has a slope in two stages with respect to horizontal or paper axis to increase the resistance gradually. 1st stage angle :21° 2nd stage angle :30° Ramp also has slope in front direction which helps media to form bow-shape. Ramp edges have been curved to reduce friction with mating platen surface. 6-8 Functional Overview