Videojet Systems International, Inc.

Dilip K Shrivastava

Pietro C Lostumbo

Richard Sutera

A temperature control unit is incorporated directly into the printhead of an ink jet printing system to provide temperature control. The temperature control system includes a heat pump assembly consisting of at least one thermoelectric device, coupled to a heat exchanger through which the ink flows. The thermoelectric device conveys heat to or from the heat exchanger carrying the ink depending upon actual ink temperature versus a desired temperature. If the ink is too hot, excess heat is dumped to a heat exchanger (or second heat exchanger) which may be air or liquid cooled. In the event that the ink is too cool, the electrical current to the TED is reversed and heat is pumped to the ink from the heat exchangers.

Temperature controller for ink jet printing

Ink jet printers used for printing large characters employ a separate solenoid valve for each drop stream which forms part of a printhead matrix. By optimizing the frequency response of the nozzle/valve sub system (primarily the connecting tubing), higher operating frequencies can be obtained. It has been found that a ratio of six to one between subsystem resonant frequency and operating frequency provides greatly improved printing.

Growing community of inventors

Wheeling, IL, United States of America

Dilip K Shrivastava