Browse Prior Art Database

Automatic Air Trap Purging

IP.com Disclosure Number: IPCOM000051413D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Blanck, TW: AUTHOR

Abstract

In the IBM 6640 ink jet printer, a pair of bubble catchers are provided which have to be periodically serviced by a customer engineer in order to remove the collected air before it is drawn into the pump. The ink system for the IBM 6640 jet printer is illustrated in U. S. Patent 3,929,071. While removal of the bubble catchers is possible, small amounts of air may still enter the ink system through the needles which puncture the ink bottle inlet and recirculating inlet ports upon withdrawing of the old ink bottle and replacing that ink bottle with a new one. Described below and illustrated in the figures is a simple self purging bubble collector which does not require periodic servicing by the customer engineer.

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Automatic Air Trap Purging

In the IBM 6640 ink jet printer, a pair of bubble catchers are provided which have to be periodically serviced by a customer engineer in order to remove the collected air before it is drawn into the pump. The ink system for the IBM 6640 jet printer is illustrated in U. S. Patent 3,929,071. While removal of the bubble catchers is possible, small amounts of air may still enter the ink system through the needles which puncture the ink bottle inlet and recirculating inlet ports upon withdrawing of the old ink bottle and replacing that ink bottle with a new one. Described below and illustrated in the figures is a simple self purging bubble collector which does not require periodic servicing by the customer engineer.

Turning now to the figures, within the needle manifold assembly 2 is a small air trap cavity 1 (bubble collector) which collects air 3a which is introduced into the needle 4 when the ink bottle is changed. A redesigned ink pump 6 includes means for venting the bubbles back up through the air trap 1 into the bottle 5. To this end, the ink pump includes a bellows 7 which returns to a rest position 8 (Fig.
2) which mechanically opens a valve 9, allowing pressure which was built up in the pump 6 to be vented back up through the air trap 1 and needle 4 into the bottle 5, as shown in Fig. 2 by the air bubbles 12 entering the bottle 5. Additionally, this will permit air 3b, which was collected in the air trap 1, also to be forced back i...