Browse Prior Art Database

Reliable Operation of Multinozzle Printhead in a Start/ Stop Mode

IP.com Disclosure Number: IPCOM000049857D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 3 page(s) / 40K

Publishing Venue

IBM

Related People

Abbot, TD: AUTHOR [+5]

Abstract

This article describes a complete start/ stop system suitable for use with a multinozzle ink jet printer. The system is designed so that the containment of ink streams during start-up is accomplished by moving head components away from any possible spray or stream misdirection. The streams are collected during start-up by an auxiliary gutter. Dependence on ink properties is reduced by using a cap to cover the nozzle during shut-down. The cap will prevent ink crusting over the nozzles, prevent air from getting into the head. and, in addition, will provide potential clog recovery capability. The moving of tunnel components provides more flexibility in selecting a cap design. The system also includes a set of drop sensors. These sensors are mounted on the moving elements and measure drop flight time and directionality.

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Reliable Operation of Multinozzle Printhead in a Start/ Stop Mode

This article describes a complete start/ stop system suitable for use with a multinozzle ink jet printer. The system is designed so that the containment of ink streams during start-up is accomplished by moving head components away from any possible spray or stream misdirection. The streams are collected during start-up by an auxiliary gutter. Dependence on ink properties is reduced by using a cap to cover the nozzle during shut-down. The cap will prevent ink crusting over the nozzles, prevent air from getting into the head. and, in addition, will provide potential clog recovery capability. The moving of tunnel components provides more flexibility in selecting a cap design. The system also includes a set of drop sensors. These sensors are mounted on the moving elements and measure drop flight time and directionality. In addition, the error sensing scheme would include a check for shorts in the charge electrode and deflection plate. This disclosed scheme can be implemented without affecting drop generator functions and without an unacceptable loss of drop placement accuracy.

Referring now to Figs. 1, 2 and 3, the start/stop system includes a drop generator 1, two movable channel halves 2 and 3. a cap 4 and an auxiliary gutter 5. Channel half 2 contains the charge electrode, the high voltage deflection plate, and the misdirection sensor, if needed. Channel half 3 contains the ground deflection plate. the primary gutter and the flight time sensor. Ink jet stream lines 6 and paper path location 7 are shown in Fig. 2. In Fig. 1 the system is shown in the shut-down mode. The start cycle includes the following steps: 1. Removal of the cap 4 from the front of the nozzles, as shown in F...