HP 2500c Service Manual - Page 126

Paper Paths and Components Chassis The chassis structure consists of two high strength polymeric supports held together by two sheet metal tie bars (see figure below). The two tie bars are placed a distance apart to yield a high moment of inertia. This results in a structure of high rigidity in torsion and bending. Besides structural purposes, the lower tie bar is used to mount the paper trough and the higher tie bar to hold the upper paper guides. An open structure like this can accommodate flexibility in designing for removable trough from the back. Moreover, the modularity allows ease of assembly at the top level; the carriage system is mounted at the top and the dual bin is mounted at the bottom on the two supports. The primary datum of the system is on the supports, thus minimizing the tolerance stackup on critical subsystems like the drive, input and carriage. Polymeric material of the supports allows flexibility in complex designs to support these subsystems. . Upper tie bar Right support Lower tie bar Left support Chassis Structure 6-6 Functional Overview