Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1996-04-09
1997-06-24
Fuller, Benjamin R.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
B41J 214
Patent
active
056421435
ABSTRACT:
An ink jet printer includes a movable carriage supported above an ink-receiving medium by a rail defining a carriage axis, with a cartridge holder mounted on said carriage having a plurality of cartridge compartments each receiving a respective thermal ink jet printer cartridge. A unitary latch assembly secures all four cartridges inside their respective cartridge compartments of cartridge holder. The latch assembly comprises a metallic spring and four forwardly facing latch ends separated by five respective forwardly facing supporting ends. Each latch end is connected to its two adjacent supporting ends by a serpentine arm defined by suitable radiused cutouts in the stamped spring to provide a shape that approximates a constant stress geometry. Each supporting end is terminated by a straight edge which is inserted into a corresponding slot at the upper rear of cartridge holder; because the latch assembly is a single unit, only one assembly operation is required for all four cartridge compartments. Because of the serpentine shape of the individual serpentine arm, it is possible to provide a spring that is relatively compact from front to rear and yet provides a relatively substantial constant downwards force on the top rear of the cartridge over a relatively large deflection range. Each latch end is provided with a cam preferably molded of a low friction material and shaped in the form of a horizontal section of an inclined cylinder. A lower tangential plane on the cylindrical surface intersects the plane of the latch end at an oblique angle, thereby producing a sideways force component to maintain a datum surface on an upper side edge of the cartridge in contact with a corresponding supporting surface on an interior side wall of the cartridge holder.
REFERENCES:
patent: 4736213 (1988-04-01), Piatt et al.
patent: 4755836 (1988-07-01), Ta Chuong et al.
patent: 5138342 (1992-08-01), Kurata et al.
Fuller Benjamin R.
Hallacher Craig A.
Hewlett--Packard Company
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