WO1979000955A1 - Commande de niveau d'encre - Google Patents

Commande de niveau d'encre Download PDF

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Publication number
WO1979000955A1
WO1979000955A1 PCT/US1979/000030 US7900030W WO7900955A1 WO 1979000955 A1 WO1979000955 A1 WO 1979000955A1 US 7900030 W US7900030 W US 7900030W WO 7900955 A1 WO7900955 A1 WO 7900955A1
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WO
WIPO (PCT)
Prior art keywords
ink
signal
level
fountain
ink level
Prior art date
Application number
PCT/US1979/000030
Other languages
English (en)
Inventor
P Van Raalte
J Macphee
Original Assignee
Baldwin Gegenheimer Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baldwin Gegenheimer Corp filed Critical Baldwin Gegenheimer Corp
Priority to DE7979900421T priority Critical patent/DE2967046D1/de
Publication of WO1979000955A1 publication Critical patent/WO1979000955A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/022—Ink level control devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices

Definitions

  • This invention relates to an apparatus for con ⁇ trolling the ink level in an ink fountain used in a printing press such as the viscous ink in art offset litho- graphic press.
  • Ink generally is considered an active substance in the sense that the ink sets when allowed to stand and dries when exposed to air.
  • ink is sticky and readily adheres to all commonly used materials. These properties pose a difficulty in sensing ink level since the ink has a tendency to accumulate or build up on any sensing member or component with which the ink comes into contact.
  • the ink fountain or reservoir in an offset printing press is constructed in the form of a trough such as shown in U. S. Patent 3,848,529 toelles-hei er et al, which is assigned to the same assignee of this invention.
  • the ink trough is formed by a flat blade which forms a nip with a fountain roller.
  • a feature of such reservoir is that the surface of the ink contained therein is not flat, but usually undulates while the pres is in operation at a frequency in the range from 0.25 to once a second. This undulation is produced by a ratchet action of a fountain roller and makes it difficult to sense the ink level.
  • Ink fountains in many printing presses are commonly equipped with ink agitators which improve ink distribution, prevent the formation of surface skin and improve feeding of the ink to the nip between the flat blade and the fountain roller.
  • the main element of an in agitator may be in the form of a conically shaped roller which is caused to rotate while traveling to and fro the length of the ink fountain. Such roller is illustrated i the aforementioned Gegenheimer et al patent.
  • the presenc of an agitator produces a wave in the ink of a height which may be of the order of an inch or even more. When the ink is so disturbed, its surface quivers and undulate so as to make it difficult to sense ink level.
  • the space above the ink fountain must be kept relatively clear to allow room for the operator of the printing press to clean the fountain or to enable ink to be fed manually for occasions when special or spot colors are necessary.
  • the sensing of ink level mus be done in such manner that the area or space over the in fountain is not unreasonably obstructed.
  • Ink level sensors may use floating, tactile, capacitance, pneumatic or ultrasonic techniques.
  • U.S. Patent 3,025,793 describes an ink level control for a newspaper press utilizing a float operated ink feed valve. Although such an approach is workable in newspaper presses, which utilize relatively thin or low viscosity inks, the float concept is not feasible in commercial presses requiring thicker inks.
  • a major diffi ⁇ culty encountered with a floating device resides in the accumulation of ink on the float, eventually rendering it inoperable. The float also tends to take up a large amount of space, particularly when such float is directly connect ⁇ ed to operate an ink flow control valve.
  • a number of prior art systems employ sensors which avoid ink contact by using the capacitance principl
  • a plate is mounted above the ink fountain to form an electrical capacitor with the ink fountain blade. Since the permitivity of ink differs significantly from air, the capacitance will vary the ink level and thus pro vides a non-contacting method for detecting ink level.
  • This sensor design has a disadvantage in that the sensor must be located within approximately an inch of the ink surface, thus obstructing access to the fountain.
  • a pneumatic ink level measuring system is avail able in the form of a vertical tube which is inserted int the ink fountain.
  • the tube is connected to a source of air and the pressure in the tube is monitored to obtain a measure of ink level.
  • This concept is satisfactory for low viscosity, inks but difficult to apply to highly vis ⁇ cous offset printing press inks.
  • Ultrasonic techniques for detecting the level o liquids are well known and have been applied to ink level controls in a limited liquid contacting manner. A genera description of ultrasonic techniques can be found in an article entitled "Ultrasonic Instruments for Level and Flow" in the September, 1974 issue of Instrumentation Technology.
  • Ultrasonic systems for determining liquid level utilize one of two basic approaches. In a first liquid contacting type, a detector provides an on-off signal whe the liquid comes into contact with the ultrasonic sensor; see, for example, U.S. Patent 3,520,186 to Adams et al. The liquid level may interrupt ultrasonic waves or cause change in the dampening characteristics of an ultrasonic transducer when it is contacted by the liquid. Contact b the detector with ink, however, is not desirable.
  • a echo ranging principle is employed, such as described in the U.S. Patent 3,985,030 to Charlton.
  • a pluse of ultra ⁇ sonic energy is directed to a transducer toward the liqui ⁇ UK surface.
  • a receiver listens for an acoustic echo and the time required for the echo to return provides a measure of the distance between the ultrasonic transducer and the liquid surface.
  • a loss of echoes is detected and used to override an automatic level indi ⁇ cator by registering a maximum liquid level depth.
  • an ink level control in accordance with the invention, the ink level is sensed remotely with an ultra- sonic pulse-echo technique.
  • An accurate ink level control is provided capable of detecting ink level even in the presence of a quivering, undulating ink surface and an agitator- wave, while providing operational safeguards for reliable and fail-safe operation.
  • an ultrasonic transducer is selected of a type capable of operating within normally encountered space restraints near the ink fountain of a printing press.
  • the transducer can be remotely spaced from an ink fountain to enable ac ⁇ cess for cleaning, yet can be mounted within the available space and provide a reliable sensor of the ink surface as a result of acoustic pulses directed at the ink. Acoustic reflections from the ink are detected and processed to produce a measured ink level signal representative of the ink level in the fountain. An averaged or smoothed measur ⁇ ed ink level signal is compared with a reference represent ⁇ ative of a normally desired ink level in the fountain and the comparison used to provide an ink feed signal. The ink feed signal is thereupon converted to ink feed pulses separated by intervals of a predetermined duration.
  • an echo loss detection network is used to detect when echoes are not received. Such loss may arise from the passage of the agitator's in wave in the path of the ultrasonic beam.
  • a simulated ink feed signal is produced to maintain normal operation of the ink level control. In th event the echo loss persists longer than a particular tim an alarm is generated.
  • the echo loss detector is particularly useful during field installation of the ink control when the ul ⁇ trasonic transducer is aligned at the ink surface.
  • the echo loss detector is visually monitored by observing an alarm light energized by an activated echo loss detector. Accurate alignment of the transducer may then be achieved by angularly moving the transducer to determine its angu ⁇ lar operating range over which an echo can be obtained. The transducer is then fixed at a midway position of the operating range. This procedure, when carried out for transverse planes which are also normal to the ink surfac provides a convenient technique for using and field align ing of a narrow beam .ultrasonic transducer.
  • both high and low ink level reference signals are generated to define an acceptable range of in level within the ink fountain.
  • the measured ink level si nal is compared with these reference signals to generate an alarm when the measured ink level falls outside this acceptable range.
  • Enhanced protection is provided by in ⁇ hibiting the feeding of ink when the ink level drops belo its acceptable low level. This feature prevents ink spil when the fountain is opened for cleaning. It is, therefore, an object of the invention to provide an ink level control which overcomes the previous described disadvantages while enabling an accurate, reliabl
  • Fig. 1 is a schematic block diagram of an ink level control in accordance with the invention for use with a printing press;
  • Fig. 2 is an electrical schematic of a simulated ink feed signal generator for use in an ink level control in accordance with the invention.
  • the ink fountain 12 may be provided with an agitator 20 which is moved to and fro as described in the Jacobheimer et al patent with a suitable actuator 22.
  • the fountain roller 16 is periodically actuated with a ratchet mechanism (not shown) .
  • Ink 23 is supplied to the fountain 12 from a supply 24 through an automatically controlled ink feed valve 26 and conduit 28. Other ink feed supply elements such as a pump have been deleted for clarity.
  • the ink surface 36 tends to distort from its normal level as shown at 37 depending upon the frequency of operation of the agitator 20, fountain roller 16 and the viscosity of the ink. A more or less permanent quivering and undulated bulge such as 39 extending over the length of the fountain 12 is often encountered.
  • An ink level sensor 30, in the form of an ultra sonic transducer, is disposed at a suitable distance from the ink fountain 12 to direct acoustic pulses along a bea axis 34 transversely onto the surface 36 of the ink 23.
  • the transducer 30 is selected of a type capable of genera ing acoustic pulses and providing an echo signal represen ative of acoustic returns or echoes from the ink surface 36 within the available space of a printing press.
  • the transducer 30 must be capable of operating within the available space above the fountain 12. Since the trans ⁇ ducer must operate in air, it tends to produce an undampe acoustic pulse followed by undesirable ringing effects an a greater spacing from the ink is needed to allow such trailing acoustic transients to die down. With the print ing press' space limitation, however, the increased spac ⁇ ing frequently is difficult to accommodate and a high fre quency transducer, capable of operating in the range of about 200 KHz is preferred.
  • transducer 30 enables one to employ remote acoustic ink surfac sensing on printing presses with acceptable accuracies.
  • the high frequency transducer however, has a narrow beam of the order of about six degrees. Hence, the transducer 30 is also carefully aligned and positioned to sense the various ink surfaces encountered on printing presses.
  • a control network 38 is provided to actuate transducer 30 and respond to the echo signal for control over the ink level in fountain 12.
  • Ultrasonic transducer capable of generating and detecting acoustic pulses are well known and need not be further described. Transducer 30 is controlled with a transceiver
  • the transceiver 40 formed of a digital circuit as may be commonly pur ⁇ chased.
  • the transceiver 40 responds to pulses, Tx, on line 41 from a timer 42 which may generate these at a hig rate of the order of 100 pulses per second.
  • Each trans- mitter pulse causes the transceiver to deliver a large driving pulse on line 44 to transducer 30 which generates an acoustic pulse towards the ink surface 36.
  • returns from ink surface 36 are detected by transducer 30, amplified by transceiver 40 and made available as an echo signal for processing on an output line 46.
  • the echo signal is applied to a gate 48 which is normally enabled by the level on line 50 from an inverter 52 coupled to the timing pulses Tx from timer 42. While pulses Tx are active, gate 48 is disabled. This prevents erroneous responses when transducer 30 generates an acous ⁇ tic pulse. If desired, a longer lasting inhibition of gate 48 may be obtained by replacing inverter 52 with a pulse network whose output pulse would last while an acoustic return from ink surface 36 could not occur; for example, an inhibiting pulse lasting for slightly less than the round trip transit time of the acoustic energy could be used.
  • the disabling level on line 50 is also applied to reset a flip-flop 54.
  • flip-flop 54 When gate 48 is enabled and receives an echo signal from transceiver 40, flip-flop 54 is set to provide an echo signal on line 56 to an ink level signal generator 58.
  • the latter is responsive to transmitter pulses Tx on line 41 and the echo signal from flip-flop 54 to measure the time therebetween and produce, on output line 60, an ink level signal representative of the actual ink level in fountain 12.
  • Techniques for measuring the transit time of an acoustic pulse to a reflecting surface are well known in the art. Hence, the measurement of the distance between transducer 30 and ink surface 36 can be carried out with a variety of different ink level signal generators 58.
  • the latter may be an analog or digital circuit capable of pro ⁇ viding a signal representative of the ink level.
  • transducer 30 Since transducer 30 provides an echo signal at a time which is a function of the spacing of transducer 30 from ink surface 36, the ink level signal is similarly re- lated. However, by placing transducer 30 a fixed known distance from ink fountain 12, the ink level signal on line 60 represents actual ink level in the fountain referenced relative to, for example, the deepest level 5 at nip 18.
  • the ink level signal on line 60 is applied to comparator 62 together with a reference signal represent tive of an operating ink level 59.3 desired to be main ⁇ tained in fountain 12.
  • This reference signal is obtaine on line 64 from a suitable network 66 and a resulting comparison is produced as an ink feed signal on output 6 of comparator 62 when the ink level, as measured, drops below the operating reference.
  • the comparator 62 is of type which does not present an output as long as the measured ink level is above the operating level.
  • the ink pulses 72 are applied to an ink feed relay 76 coupled to operate valve 26 and enable ink to flow into fountain 12.
  • Clock 70 has an interval control network 78 to control the duration of intervals 74 and a pulse width selection network 80 to regulate the widths of pulses 72.
  • the pulse widths are selected to be long enough to keep with the printing press' utilization of ink, but not so long that the fountain would overflow.
  • the intervals 74 must be long enough to allow the ink to level out in between feeds to prevent an over flow, but short enough to keep up with the ink utilizati of the printing press.
  • the interval control network 78 sets the time between successive pulses 72. This interval is made sufficiently long to enable a change in the ink level to be registered in response to a previous ink supply pulse.
  • the duration is a function of viscosity with more viscous inks requiring longer intervals.
  • the pulse widths may be of the order of 1 to 15 seconds separated by inte vals of 15 seconds for an ink having a viscosity of the order of 200 poise.
  • the ink level control 10 maintains ink in the fountain below maximum level 59.5 by applying a high ink level reference signal on line 82 from a reference source 84 to a comparator 86.
  • the high ink level reference sig- nal represents the maximum acceptable ink level 59.5 in the fountain 12 and is compared with the measured ink level signal on line 60 to produce an alarm on comparator output 88 when the ink level exceeds the maximum level 59.5.
  • an ink wave such as caused by the action of the agitator 20, generates an acoustic re ⁇ turn which causes the measured ink level signal on line 60 to temporarily represent an ink level above the maximum level 59.5.
  • comparator 86 may produce an alarm signal on output 88.
  • a timer 90 is employed to screen out momentary high ink level detections. Timer 90 is of a type whereby the high ink level alarm on line 88 must per ⁇ sist for a minimum time period to cause a high ihk level alarm on output 92 to activate a high level relay 93. The relay may be used to sound an audible alarm 94.
  • the ink level in fountain 12 is normally kept at or above operating level 59.3. If, notwithstanding such control, the ink level drops below the operating level 59.3 and also below minimum level 59.2, the condition is identified as a malfunction with a minimum level control 95.
  • the measured ink level signal on line 60 and a low ink level reference signal on line 96, representative of minimum level 59.2 and generated by a source 98, are compared by a comparator 100. If the measured ink level drops below minimum 59.2, a low ink level alarm signal is produced on comparator output 102.
  • comparator output 102 is applied to an inhibit input of comparator 62
  • Comparator output 102 is also applied to a relay 104 to operate such devices as appear necessary to respond to such low ink level condition since the low level may also be due to valve 26 being stuck or the ink supply being de pleted.
  • Relay 104 may, for example, sound an audible alarm 106.
  • ultrasonic transducer 30 provides th advantage of remote sensing of the ink level. However, from time to time the ink surface 36 is not level so that acoustic returns are reflected in the direction of arrow 35 instead of back onto transducer 30. As a result, an echo may be lost and no echo signal produced on line 56. In order to avoid a misinterpretation of such echo loss a an excessively low ink level, the loss of echo signal is detected with a network 110 and an appropriate ink level signal is simulated and provided on line 60.
  • Echo loss detector 110 includes a pulse network 112 which sets a flip-flop 114 in the event an echo signa fails to occur on line 56 within a certain time period following a transmitter pulse Tx. If an echo signal does occur, the setting pulse from pulse network 112 is ineffe tive since the echo signal on line 56 from flip-flop 54 i applied to maintain flip-flop.114 in its reset state. In the event no echo is detected, the reset level on line 56 to flip-flop 114 is not present and the output pulse on line 116 from pulse network 112 sets flip flop 114 to provide an echo loss signal on flip-flop outp 118.
  • an echo simulator circuit 120 is activated to provide a simulated ink level signal on line 122 represen ative of an ink level 59.4 between the operating level 59 and maximum level 59.5.
  • the ink level signal is applied network 58 and appears on line 60 as long as echoes are lost.-
  • flip- flop 114 is reset and the simulated ink level signal on
  • a malfunction signal is produced with a timer 124 actuated by the echo loss signal on line 5 118.
  • Timer 124 generates an alarm signal on line 126 for actuation of an appropriate alarm 128.
  • Fig. 2 illustrates an analog form of echo simu ⁇ lator 120 for generating a simulated ink level signal.
  • the simulator operates with an ink level signal generator
  • capacitor 132 involves its smoothing effect upon the ink level signal. Such smoothing is desirable in view of the occasional loss or changes in the arrival time of an echo signal due to the
  • a time constant associated with the charging , of capacitor 132 may be of the order of about a third of a second.
  • the ink level control in accordance with the invention can be obtained with a digital network.
  • a microprocessor may be programmed to respond to the transceiver output 46 and transmitter pulses, Tx, to provide a digital echo signal.
  • Tx transmitter pulses
  • 35 can be done is to enable an internal microprocessor clock to enter pulses into a register and terminate this when the transceiver generates an echo signal.
  • count in the register represents the two-way travel time of an ultrasonic pulse from transducer 30 to ink surface 36.
  • the actual distance is directly proportional to the travel time and can be derived using a value of the speed of sound in air.
  • the distance value effectively represents the measured ink level by virtue of the known distance betwee the transducer and the bottom level 59.2 of the ink foun ⁇ tain.
  • the distance value is thus converted to a measured ink signal within the microprocessor and stored in a suit able memory location.
  • a suitable averaging technique may be employed to smooth out the effect of ink level surface variations.
  • the number of travel time or distance measur ments to be averaged depends upon the travel speed of the agitator 20 and the size and frequency of the vibrations of the ink surface 36. In a pulse echo ink level control which generates of the order of about 100 echo pulses per second, the averaging of about 50 measured travel times can be used.
  • the stored ink level signal is then compared with various previously stored digital values for the hig low and operating levels to provide an ink feed signal to the ink feed valve 26.
  • An echo loss can be detected by comparison with a particularly low ink level reference value such as 59.1.
  • the digital form of ink level contro 10 may thus take the form of a programmed microprocessor or with discrete digital circuits as may appear desirable
  • a digital form of the measured ink level signal such as developed either by generator 58, or its digital counterpart, is stored in a memory such as represented by storage network 57. This storage may be a location in a microprocessor memory or a particular output register for subsequent comparison with the reference signals.
  • the stored ink level signal is retained until replaced as a result of a new measurement with " an echo signal.
  • the newly measured ink level will appear as an excessively low ink level and should not be used. Therefore, the output on line 118 is applied to network 57 to prevent replacement of the previously stored digital measured ink level signal, Such effect may, for example,, be obtained by blocking the input to register 57 with suitable logic gates, Hence ⁇ when an echo loss occurs r a previously measured ink level signal is used to simulate the current ink levels. This condi- tion persists until an echo signal is again detected.
  • the detection of an echo loss on line 118 is used to replace the digital signal in storage network 57 with one representative of a predetermined ink level to avoid ink fountain overflows as may occur when the previ ⁇ ous ink level measurement sensed a low ink level.
  • Such digital simulated predetermined ink level signal may be generated as soon as an echo loss is detected or may, for example, be obtained from a digital form of the simulated reference source 136 as shown in Fig. 2 such as can be stored in a memory location of a microprocessor.
  • the echo loss detector 110 may be conveniently employed to align the ultrasonic transducer 30 onto ink surface 36. This is done by mounting transducer 30 for pivoting in transverse planes which are also normal to ink surface 36. The transducer ' 30 is then pivoted until the echo is lost as observed by detecting a visual ala energized by detector 110. The middle of the pivot range for each plane is then selected as the aligned position o transducer 30.
  • the described alignment procedure may also be carried out by observing a light source 53, such as an LED, driven by the reset output 55 of flip-flop 54.
  • a light source 53 such as an LED
  • the output 55 will be off most of the time and hence a very dim LED output is obtained as a sensing of the proper operation of the ink level control.
  • the reset output 55 will be continuously on and as a result the LED output significantly brighter.
  • operational functions of the flip-flop 54 and related seg ments of control 10 are porvided inside a microprocessor alignment of transducer 30 can be carried out by monitor ⁇ ing alarm 128.
  • the level of ink can be precisely controlled without direct contact with the ink and while the ink surface is disturbed by an agitator. Variations from the described embodiment may occur to one skilled in the art.
  • the echo loss simulator network may be in digital form to accommodate a digital ink level sig nal generator.
  • a plurality of ink controls may be used. The scope of the invention, therefore, should be determined by the following claims.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

Commande de niveau d'encre d'une presse d'imprimerie ayant un detecteur de niveau d'encre ultrasonique (30) pour recevoir un signal d'echo d'indication du niveau de l'encre dans le distributeur d'encre. Une commande est prevue pour maintenir le niveau d'encre a un niveau de fonctionnement ideal et les niveaux excessivement bas ou eleves de l'encre sont aussi detectes par le detecteur. Un reseau de detection de perte de l'echo (110) avertit l'operateur et ferme les conduits d'alimentation d'encre. La commande est concue pour empecher le debordement du distributeur d'encre (12).
PCT/US1979/000030 1978-04-21 1979-01-18 Commande de niveau d'encre WO1979000955A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE7979900421T DE2967046D1 (en) 1978-04-21 1979-01-18 Ink level control apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US89892578A 1978-04-21 1978-04-21
US898925 1978-04-21

Publications (1)

Publication Number Publication Date
WO1979000955A1 true WO1979000955A1 (fr) 1979-11-15

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ID=25410235

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1979/000030 WO1979000955A1 (fr) 1978-04-21 1979-01-18 Commande de niveau d'encre

Country Status (5)

Country Link
EP (1) EP0015954B1 (fr)
JP (1) JPH042431B2 (fr)
DE (1) DE2967046D1 (fr)
IT (1) IT1118516B (fr)
WO (1) WO1979000955A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
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US4453462A (en) * 1981-03-10 1984-06-12 Mathias Mitter Application of a foamed treating medium to a sheet-material workpiece
EP0170137A2 (fr) * 1984-08-02 1986-02-05 Metromedia Company Appareil et méthode de positionnement d'une tête d'impression à jet d'encre
EP0459755A1 (fr) * 1990-05-29 1991-12-04 Baldwin Technology Corporation Système de contrôle du niveau d'encre pour presses d'impression offset
US6561099B1 (en) * 1998-06-16 2003-05-13 Koenig & Bauer Ag Inking method and apparatus
DE19600796B4 (de) * 1995-04-05 2006-10-05 Heidelberger Druckmaschinen Ag Farbkasten mit Farbkastenwalze im Farbwerk von Druckmaschinen
DE202011102192U1 (de) 2010-12-10 2011-10-25 Jan Franck Vorrichtung zur Versorgung eines Druckers mit Tinte
WO2019057341A1 (fr) * 2017-09-22 2019-03-28 Bobst Firenze S.R.L. Système d'encrage avec stockage d'encre minimal

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JP4615640B2 (ja) * 1998-02-14 2011-01-19 ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフト 印刷機のインキ壷におけるインキを調量する方法
JP2014237266A (ja) * 2013-06-07 2014-12-18 大日本印刷株式会社 インキ残量監視システム
US10894423B2 (en) 2018-12-03 2021-01-19 Hewlett-Packard Development Company, L.P. Logic circuitry
WO2020117195A1 (fr) 2018-12-03 2020-06-11 Hewlett-Packard Development Company, L.P. Circuiterie logique
US11338586B2 (en) 2018-12-03 2022-05-24 Hewlett-Packard Development Company, L.P. Logic circuitry
EP4235494A3 (fr) 2018-12-03 2023-09-20 Hewlett-Packard Development Company, L.P. Circuits logiques
EP4027255A1 (fr) 2018-12-03 2022-07-13 Hewlett-Packard Development Company, L.P. Circuits logiques
AU2018451612B2 (en) 2018-12-03 2022-09-08 Hewlett-Packard Development Company, L.P. Logic circuitry
EP3687819A1 (fr) 2018-12-03 2020-08-05 Hewlett-Packard Development Company, L.P. Ensemble de circuits logiques
US20210216491A1 (en) 2018-12-03 2021-07-15 Hewlett-Packard Development Company, L.P. Logic Circuitry
CN113168444A (zh) 2018-12-03 2021-07-23 惠普发展公司，有限责任合伙企业 逻辑电路系统
CN113165385B (zh) 2018-12-03 2022-10-14 惠普发展公司，有限责任合伙企业 逻辑电路系统
EP3844000B1 (fr) 2019-10-25 2023-04-12 Hewlett-Packard Development Company, L.P. Boîtier de circuit logique

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US2813538A (en) * 1955-02-25 1957-11-19 Miehle Goss Dexter Inc Ink level control mechanism
US3407398A (en) * 1964-01-30 1968-10-22 British Petroleum Co Liquid presence detector
US3985030A (en) * 1974-10-29 1976-10-12 William Mcgeoch & Company Ultrasonic acoustic pulse echo ranging system
US4000650A (en) * 1975-03-20 1977-01-04 Bindicator Company Method and apparatus for ultrasonic material level measurement
US4090407A (en) * 1977-09-19 1978-05-23 T. W. Salisbury, III Water level measurement device
US4121094A (en) * 1977-02-16 1978-10-17 Driomi, Inc. System for detecting, indicating and regulating the level of semi-solid matter in a reservoir
US4144517A (en) * 1977-08-05 1979-03-13 Joseph Baumoel Single transducer liquid level detector

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US2813538A (en) * 1955-02-25 1957-11-19 Miehle Goss Dexter Inc Ink level control mechanism
US3407398A (en) * 1964-01-30 1968-10-22 British Petroleum Co Liquid presence detector
US3985030A (en) * 1974-10-29 1976-10-12 William Mcgeoch & Company Ultrasonic acoustic pulse echo ranging system
US4000650A (en) * 1975-03-20 1977-01-04 Bindicator Company Method and apparatus for ultrasonic material level measurement
US4000650B1 (en) * 1975-03-20 1995-11-14 Endress Hauser Gmbh Co Method and apparatus for ultrasonic material level measurement
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US4144517A (en) * 1977-08-05 1979-03-13 Joseph Baumoel Single transducer liquid level detector
US4090407A (en) * 1977-09-19 1978-05-23 T. W. Salisbury, III Water level measurement device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4453462A (en) * 1981-03-10 1984-06-12 Mathias Mitter Application of a foamed treating medium to a sheet-material workpiece
EP0170137A2 (fr) * 1984-08-02 1986-02-05 Metromedia Company Appareil et méthode de positionnement d'une tête d'impression à jet d'encre
EP0170137A3 (en) * 1984-08-02 1987-01-14 Metromedia, Inc. Apparatus and method for positioning an ink-jet printing head
EP0459755A1 (fr) * 1990-05-29 1991-12-04 Baldwin Technology Corporation Système de contrôle du niveau d'encre pour presses d'impression offset
DE19600796B4 (de) * 1995-04-05 2006-10-05 Heidelberger Druckmaschinen Ag Farbkasten mit Farbkastenwalze im Farbwerk von Druckmaschinen
US6561099B1 (en) * 1998-06-16 2003-05-13 Koenig & Bauer Ag Inking method and apparatus
DE202011102192U1 (de) 2010-12-10 2011-10-25 Jan Franck Vorrichtung zur Versorgung eines Druckers mit Tinte
EP2463103A1 (fr) 2010-12-10 2012-06-13 Jan Franck Dispositif d'alimentation en encre pour imprimante
WO2019057341A1 (fr) * 2017-09-22 2019-03-28 Bobst Firenze S.R.L. Système d'encrage avec stockage d'encre minimal
US11383510B2 (en) 2017-09-22 2022-07-12 Bobst Firenze S.R.L. Inking system with minimal ink storage

Also Published As

Publication number Publication date
JPH042431B2 (fr) 1992-01-17
EP0015954B1 (fr) 1984-06-13
DE2967046D1 (en) 1984-07-19
EP0015954A1 (fr) 1980-10-01
JPS55500276A (fr) 1980-05-08
IT1118516B (it) 1986-03-03
IT7967619A0 (it) 1979-03-26

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