Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1991-12-31
1993-07-06
Fuller, Benjamin R.
Recorders
Markers and/or driving means therefor
With ink supply to marker
B41J 2175
Patent
active
052258548
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement in inkjet printers of the kind in which, in response to an applied impulse, ink droplets are intended to be propelled through an ink nozzle or jet onto a recording medium, and particularly of the kind which include a detachable ink container which includes the nozzle through which ink droplets can be propelled and an ink chamber located adjacent the nozzle.
The use of detachable ink containers with inkjet printers is known to the art, for instance from U.S. Pat. No. 4,057,807. In the case of the ink container known from the aforesaid Patent Specification, one wall of the ink container is constructed of two laminated layers each consisting of mutually different materials having mutually different tensioning properties in the presence of a magnetic field, therewith causing the laminated material to bend when a magnetic field is applied. Accordingly, a drive means in the form of an electromagnet is placed over the laminated layer, so that when current is passed through the drive means, the laminated layer will bend outwards and therewith reduce the volume of the ink chamber. The detachable ink container thus includes part of the activating means required to propel ink droplets.
A similar arrangement is also known from JP abstract 57-49570, this arrangement also including a coil-activated plate which defines one wall of an ink chamber and which functions to achieve propulsion of the ink droplets. This plate must also have special properties in order to be able to move when influenced by the coil, and the plate belongs to the detachable part.
The object of the present invention is to provide a novel and improved arrangement in inkjet printers of the kind which include a detachable ink container, such as to enable the ink container to be produced from an inexpensive material so that the container can be viably scrapped after being used only once.
This object is achieved by means of the present invention, which is characterized by the features set forth in the following claims.
The invention will now be described in more detail with reference to a non-limiting, exemplifying embodiment thereof illustrated in the accompanying drawings, wherein
FIG. 1 is a cross-sectional view of an inventive ink container, and
FIG. 2 illustrates in larger scale the area marked A in FIG. 1, and also illustrates an activating device.
Thus, FIG. 1 illustrates a detachable ink container 1 which includes a large reservoir chamber 2 from which a delivery conduit 3 extends down to an ink chamber 4, and a nozzle 5 which is located adjacent the ink chamber 4. The ink container 1 is preferably provided with a large number of ink chambers 4 and nozzles 5, the delivery conduit 3 being configured as a manifold conduit extending from the reservoir chamber 2. The ink chambers 4 and nozzles 5 may then be disposed in a row perpendicular to the plane of the paper in FIG. 1.
An activating device is located behind the ink chamber 4 and functions to effect propulsion of ink droplets through the nozzle 5, therewith to carry out the desired printing operation. As illustrated in FIG. 2, the activating device has the form of a rod 6, which may optionally be made of a magnitostrictive material and which is embraced by an electric coil 7. These components are disposed in the part which is fixedly connected to the printer and are thus not detachable together with the detachable ink container. Located between the rod 6 and the ink chamber 4 is an elastic wall 8 which can either be attached to that part which can be detached from the ink container 1 or mounted in a housing 9 in which the rod 6 and the coil 7 are mounted. The elastic wall 8 extends over the whole of the ink chamber 4 in a direction towards the rod 6, and the ink chamber 4 is open towards the elastic wall 8.
The elastic wall 8 may conveniently be a diaphragm which is intended to close one wall of the ink chamber 4.
When the coil 7 receives a current pulse, the rod 6 is moved axially in a direction towards the elastic wall 8, which therewith bulges b
REFERENCES:
patent: 4057807 (1977-11-01), Fischbeck et al.
Bernhard Bo
Stankelstrom Anders
Bobb Alrick
Facit AB
Fuller Benjamin R.
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