| 摘要 |
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. The system transports envelopes according to a motion profile in which the envelope is decelerated from a transport velocity to a slower printing velocity. After t he printing operation has been completed, the envelope is accelerated back to t he transport velocity and transferred to a downstream module. None of the intervals of deceleration, low print velocity, or acceleration may occur whi le an envelope in the postage printing module is also in the control of another module. The print head is geared to operate in synchronism with the print transport. Further, upon the occurrence of an error condition, such as a jam , the print transport is 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 o r restarting is therefore controlled as a predetermined function, or set of functions, of the displacement of other modules in the system.
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