Recorders – Record receiver deforming
Patent
1989-06-20
1991-10-08
Fuller, Benjamin R.
Recorders
Record receiver deforming
346140R, 417413, G01D 1518, F04B 1700
Patent
active
050558579
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for receiving a combination of two variable volume chambers and a plurality of valves for forming an ink supply circuit for an ink jet printing head.
DESCRIPTION OF THE RELATED ART
In a French patent application No. 86 17385 filed on 10/12/86, completed by a Certificate of Addition application No. 87 12008 filed on 26/08/87, the Applicant described a fluid supply circuit for an ink jet printing head equipped with a multi function cell formed essentially of two chambers whose volume varies as a function of the position of a single piston coupled to the same eccentric driven by the same motor. In these two applications all the means have been described: chambers, valves, restriction, reservoir, etc. . . . required for obtaining all the functions necessary for the correct operation of the ink jet printing head.
To further improve the performances of such a combination, it is important to construct the assembly in as compact a volume as possible.
SUMMARY OF THE INVENTION
The object of the present invention is to solve this problem and relates to an arrangement of the assembly of means used in a structure easy to construct, simple and leading to a final extremely compact device.
The present invention relates more precisely to a device intended to receive two variable volume chambers and a pressure sensor cooperating with a plurality of valves and valve-restriction pairs for providing the function inherent in the correct operation of an ink supply circuit for an ink jet printing head and recovery of the unused ink in the recovery gutter; which device is characterized in that it is formed of a one piece solid block made from a material resisting chemical aggressions. in which are formed:
on the one hand, a central cylindrical housing having two zones of diameter .phi..sub.1 and .phi..sub.2 in which a piston P may move formed by the stacking of two parts of diameter O.sub.1 and O.sub.2 defining, within these two zones by means of two sealing membranes, the two variable volume chambers;
on the other hand, a plurality of cavities for receiving the valves;
finally, a housing receiving the pressure sensor.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be better understood from the following explanations and the accompanying figures in which:
FIGS. 1a and 1b recalls the operation of a variable volume chamber such as described in the above referenced patent applications;
FIG. 2 illustrates schematically a variant of an ink supply circuit for an ink jet printing head intended to be integrated in a device in accordance with the present invention;
FIGS. 3, 4 and 5 illustrate the structure of the device of the present invention;
FIGS. 6 and 7 are illustrative diagrams complementary to FIGS. 2 to 5;
FIGS. 8 and 9 are sections through planes parallel to the base of the device, taken at two levels; and
FIG. 10 is a sectional view of an assembly equipped with a device of the present invention.
For the sake of clarity, the same elements bear the same references throughout the figures.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A cell such as described in the two above mentioned patent applications is illustrated in FIGS. 1a and 1b. It is essentially formed of a chamber 1 whose volume varies as a function of the movement of a piston P. The latter is connected mechanically by means 2 to an eccentric 3 driven by a stepper motor 4. This variable volume chamber 1 is connected both to a pressure sensor 5 and through a duct 6 to one, two or more valves electrically controlled by coils b. Only two valves 7 and 9 are visible in FIGS. 1a and 1b, but this number is not restrictive and the application described further on will moreover clearly indicate the use of a plurality of valves associated with a single chamber. These valves accept both directions of flow of the fluid and are normally closed in the absence of an electric signal. The position of slide t shows for example that valve 7 is in the blocking position in F
REFERENCES:
patent: 4357617 (1982-11-01), Shimazawa et al.
patent: 4737802 (1988-04-01), Mielke
Fuller Benjamin R.
Imaje (SA)
Preston Gerald E.
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