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公开(公告)号：CA1108729A
公开(公告)日：1981-09-08
申请号：CA305789
申请日：1978-06-20
Applicant: IBM
Inventor： MEECE KERMIT A , TAYLOR THOMAS S
Abstract: METHOD AND APPARATUS FOR DETERMINING THE VELOCITY OF A LIQUID STREAM OF DROPLETS A pressurized ink jet stream is broken up into droplets spaced substantially uniform distances by application of a predetermined frequency to the stream. When the velocity of the stream is to be determined, a frequency perturbation is placed in the predetermined frequency to produce a gap in the stream of droplets at a selected distance from the perturbation application point. The presence of the gap is optically sensed at the selected distance by determining when the time period between adjacent droplets at the selected distance exceeds a predetermined period of time. The velocity of the stream is determined in accordance with the time that it takes from the perturbation of the gap until the gap is sensed at the selected distance because of the time period between adjacent droplets exceeding the predetermined period of time. After the velocity of the stream is determined, it is compared with a desired velocity, and corrections in the pressure of the stream are made in accordance with the difference between the determined velocity and the desired velocity and whether the determined velocity is larger or smaller than the desired velocity so that the velocity of the stream can be corrected to be within a predetermined range of the desired velocity.
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公开(公告)号：FR2405754A1
公开(公告)日：1979-05-11
申请号：FR7826224
申请日：1978-09-08
Applicant: IBM
Inventor： MEECE KERMIT A , TAYLOR THOMAS S
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公开(公告)号：CA1098162A
公开(公告)日：1981-03-24
申请号：CA306040
申请日：1978-06-22
Applicant: IBM
Inventor： NEVILLE MARK H , TAYLOR THOMAS S
Abstract: OBJECT DEFLECTION SENSOR An ink drop height sensing device for an ink jet recording apparatus, the apparatus including a nozzle for forming and propelling a stream of ink drops towards a recording media in a predetermined deflection plane. A light source on one side of the intended path or trajectory in the plane of deflection of the ink drops impinges upon a mask located on the opposite side of the plane, which mask is aligned with a light sensitive device such as a phototransistor located behind the mask. The mask includes first, second and third line sensors, in the illustrated instance serially arranged slots with at least two of the slots being in parallel relation, the third slot being inclined with respect to the parallel slots and positioned with respect to them so that at a predetermined point along its length, it is a predetermined distance from the next adjacent slot relative to the distance between the two parallel slots. The phototransistor is coupled to a timer for comparing the time intervals for the passage of the ink drop between the parallel slots which is compared with the time taken for passage between one of the parallel slots and the inclined slot. If the time of the drop travel between the parallel slots is determined, (the distance being fixed), and the time of drop travel between one of the parallel slots and the inclined slot is compared to that time interval, dependent upon whether the time measurement is longer or shorter, then it may be determined whether the drop is high or low in the deflection plane and suitable correction may be employed to bring the deflected ink drops to their predetermined deflection height or trajectory path. LE977008 1
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