Browse Prior Art Database

Hydraulic Filter System

IP.com Disclosure Number: IPCOM000084087D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Portig, H: AUTHOR [+2]

Abstract

This ink recirculating system includes a capillary tube for reducing pump pressure ripple to a negligible amount, without sacrifice of response time. When incorporated in an ink jet printer, such reduction in ripple is essential to insure accurate drop placement and high-quality printing.

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Hydraulic Filter System

This ink recirculating system includes a capillary tube for reducing pump pressure ripple to a negligible amount, without sacrifice of response time. When incorporated in an ink jet printer, such reduction in ripple is essential to insure accurate drop placement and high-quality printing.

Ink is provided from a supply bottle, not shown, to hose 1. Circulation is as follows. Ink is drawn through bubble catcher 2 and hose 3 to pump 4 which provides pressure to nozzle 5. From pump 4, ink passes through hose 6, capillary tube 7, hose 8, filter 9 and hose 10 to main valve 11 which is turned on and off to control flow.

Thereafter ink goes from valve 11 by conduit 12, filter 13, and conduit 14 to nozzle 5.

Valve 11 prevents ink from dribbling out of nozzle 5 and contaminating other machine elements. Ink from the nozzle 5 which is not used in printing is directed into gutter 15, where it gravity flows downward at 16 to the return side of the system. Reservoir 17 with mesh material 18 prevents ink sloshing.

Of particular interest is capillary tube 7 with the equal length soft hoses 6 and 8 on each end. See Fig. 2. Hoses 6 and 8 at each end of the capillary tube 7 serve as accumulators and the capillary tube 7 serves as a resistive element and an inertial element. (Fig. 1) This reduces the pressure ripple at the head caused by pump 4 to less than 0.35% of the total pressure. The servo time constant (pressure response time constant) is still maintain...