| 摘要 |
<p>A system and a method to control the motion of envelopes within a postage printing module to accommodate the use of slower print techniques and to achieve high throughput in a mail processing system. Envelopes transported in a mail processing system are diverted into two or more parallel print paths. At the parallel postage printing modules envelopes are processed according to a motion profile in which the envelope is decelerated from a transport velocity to a slower printing velocity. After the printing operation has been completed, the envelope is accelerated back to the transport velocity and transferred to a downstream module, where the parallel print paths are merged back into a single print path. The print head is preferably geared to operate in synchronism with the print transport. Further, upon the occurrence of an error condition, such as a jam, the print transports for the parallel paths are decelerated to a stop in such a manner as to preserve the spacing between subsequent envelopes to be the same as if no error condition had occurred. Displacement motion of the print transport during a stoppage or restarting is therefore controlled as a predetermined function, or set of functions, of the displacement of other modules in the system. <IMAGE></p> |
