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Cleaning Apparatus for a Multielectode Printhead

IP.com Disclosure Number: IPCOM000052731D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Applegate, SL: AUTHOR [+2]

Abstract

Printheads having multiple electrodes that are swept across a printing surface incident to printing tend to accumulate interelectrode debris which causes degradation of printing quality. A cleaning arrangement is described for electrically removing such debris to restore printing quality.

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Cleaning Apparatus for a Multielectode Printhead

Printheads having multiple electrodes that are swept across a printing surface incident to printing tend to accumulate interelectrode debris which causes degradation of printing quality. A cleaning arrangement is described for electrically removing such debris to restore printing quality.

Referring to the figure, a printhead 10 has a row alignment of electrodes 12 that normally engage a web or strip 14 incident to printing. Electrical signals for printing are supplied to the electrodes 12 over a set of respective signal channels 16 by individual electrode drivers 18 (numbered 1 to n) which are controlled by printer control logic 20.

Preferably, during a return movement of a printhead carrier (not shown), the control logic 20 produces a signal HC for causing a head cleaning operation to be performed.

Through a first signal path 22, the signal HC activates a head-retract solenoid 24 to move the printhead 10 away from the web 14. A second signal path 26 transmits the signal HC to a gate 28 that is connected to apply a cleaning level voltage +V to a printhead cleaning circuit 30. The printhead cleaning circuit 30 includes a set of conductors 32 that are connected to alternate electrodes 12 of the row array (as shown, the even numbered electrodes).

To prevent shorting of the conductors 16, the conductors 32 are connected to the gate 28 through individual diodes 34. During a cleaning operation, the voltage +V is applied...