• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method for driving an ink jet comprising a compression chamber for the ink, the volume of which is charged by means of a piezo-electric transducer by expanding the chamber in preparation for printing, contracting the chamber to print, and expanding the chamber again in preparation for another cycle of printing.
    公开号:SU1060098A3
    申请号:SU792800299
    申请日:1979-08-08
    公开日:1983-12-07
    发明作者:Греве Хельмут
    申请人:Др.Инж.Рудольф Хелль Гмбх (Фирма)；
    IPC主号:
    专利说明:

    T7
    So
    2, A device for controlling an ink recording organ, comprising a piezoelectric converter located on the ink recording organ, characterized in that, in order to increase control efficiency, it has current sources, switches and a signal generator, the outputs of the current sources are connected to the piezoelectric converter interconnected, the control inputs of which are connected to the corresponding outputs of the signal generator,
    The invention relates to a method for controlling an ink recording organ, as well as devices for controlling an ink recording organ.
    There is a known method of controlling an ink-recording organ, which consists in compressing and expanding the ink-recording organ using a piezoelectric transducer.
    A device for controlling an ink recording organ is known, comprising a piezoelectric transducer disposed on the ink recording organ l.
    A disadvantage of the known solutions is the low efficiency of control of the ink recording organ.
    The purpose of the invention is to improve the management efficiency of the ink recording organ,
     The goal is achieved in that, according to the method of controlling the ink recording organ, which consists in compressing and expanding the ink recording organ using a piezoelectric transducer, fixes the static state of the ink recording organ, then expands it from a static state, compresses it to a state exceeding static, expanded to a static state, after which. operations are repeated, with compression and expansion being carried out by flowing a pulse pulse through a piezoelectric transducer. ka, whose pulses have opposite polarity and variable duration,: ;; . . The goal is achieved by the device for controlling the ink record organ. The containing piezoelectric transformer tal located on the ink recording body has current sources, switches and a signal generator, the outputs of the current sources are connected to the piezoelectric transducer by means of switches interconnected, the control inputs of which are connected to
    corresponding outputs of the signal generator.
    FIG. 1 shows the recording body of an ink recording with a control voltage generator; on fit, 2 - pulse diagram; Fig. 3 shows an example of a signal generator; in fig. 4 - friend pulse diagram.
    FIG. Figure 1 shows a sectional view of the conceptual structure of an ink recorder and a control voltage generator for a piezoelectric transducer.
    The recording body of the ink recording consists of a. Tube-shaped elastic chamber 1 of compression from Glass or synthetic material. Directed to the recording medium 2. The end of the compression chamber 1 is made in the form of a writing tip 3. The other end is connected via a throttle 4 to an ink supply container 5. The compression chamber. surrounded by a piezoelectric transducer b in the form of a hollow cylinder (toroid), which, by using the piezoelectric effect, narrows or expands the volume of chamber 1 to the beat of the control voltage Lig,
    The device also contains electrodes 7 and 8 for creating an electric field, conductor 9, generator 10, current sources 11 and 12, switches 13 and 14, wires 15 and 16, signal generator 17, electric line 18, correcting stages 19 and 20, and 21, interconnecting delay elements 22-24, and an IS-NOT element 25, wherein the outputs of the current sources 11 and 12 are connected to a piezoelectric transducer 6 by means of switches 13 and 14 interconnected, the control inputs of which are connected. with the corresponding outputs of the generator 17 signals.
    The device operates as follows.
    In a static quiescent state in which a slight drop in pressure acts on the tip nozzle 3, a concave ink meniscus is formed at the tip exit, and ink is not supplied from the tip nozzle 3. The static quiescent state is established by the bias control voltage Ugv Only with appropriate control of the piezoelectric transducer b, due to the pressure wave in the compression chamber 1, the ink petal is squeezed out of the writing tip 3. medium 2 and form printed dots.
    The advantage of such a reduced pressure system is that the recording organ is turned on and off by electrical control.
    In the exemplary embodiment, the piezoelectric transducer consists of radially formed piezoceramics. . .
    Metal layers in the form of electrodes 7 and 8 are sprayed onto the inner and outer surfaces of the piezoelectric hollow cylinder to create an electric field. By contacting, piezoelectric ceramics electrically behaves like a capacitor with a relatively large capacitance. The electrode 7 is connected to the potential of the mass, and to the electrode 8 is supplied a control voltage Ug which is formed by the control current Dg flowing through the conductor 9. . .
    Control current 5 (Formed in generator 10 of two direct currents 3 (and Oj of different polarity, which are formed by S two sources X11 and 12 currents. Sources 11 and 12 currents by means of corresponding switching means (in the example of execution using two switches 13 and 14) can be turned on and off.
    The switches 13 and 14 can be controlled by digital switching signals S, and 5, which are fed through wires 15 and 16 and are formed in the signal generator 17 in accordance with: the write command received on line 18.
    The constant currents -Зд and J are equal in magnitude, but currents of arbitrary magnitude can also be applied. In order to match the characteristic of the current change with the properties of the liquid and the recording body with the ink recording, the currents 34 and 3 are pre-adjusted in various ways using the correcting stages 19 and 2Q so that a control signal of 3 g is produced,
    Each So instruction on line 18 performs an opsc recording cycle to form droplets, which consists of three consecutive independent phases through certain
    time intervals, namely from the preparatory phase I, the recording phase I) and the regeneration phase lit.
    The characteristic change of control current due to digital
    the switching signals 6 and Sj are shown in the diagram of FIG. 2; Preparatory phase 1 is indicated by a time interval, the recording phase 1) the time interval tj-t and the phase
    regeneration III - time interval.
    The corresponding progress of the manager. voltage (J 5 at the electrode 8 of the piezoelectric transducer 6 is also shown in the diagram of FIG. 2,
    With the control voltage DS, the piezoceramics increases in the direction of polarization Up of the piezo-ceramics, and with the corresponding control voltage of the opposite polarity, the volume of the compression chamber 1 decreases.
    The control voltage variation corresponds to the characteristic, according to which the volume of the compression chamber also changes.
    Static state of camera 1
    Compression is determined by the control voltage of the bias voltage and the control current. The voltage swing between the maximum and minimum control voltages U 5 t lies symmetrically with respect to the control bias voltage U d.
    The characteristics of the variation of the curves shown in Fig. 2 are explained in detail below.
    During preparatory 1 in the time interval t -t2BKn | 04eH the first current source 11 under the action of the signal Si,
    direct current S3 l control voltage DS increases in the direction of the polarization voltage 1) p from the control bias voltage to the maximum value 1) d, ",
    Due to this, the compression chamber 1 expands immediately before the recording phase of the relatively static. condition, so again the ink comes from the reservoir for the stock
    ink 5 in camera 1 squeeze,
    Due to the preparatory phase, the speed at which the ink droplets exit the writing tip 3 is predominantly increased, thereby increasing the operating speed of the recording device with the ink
    by record.
    During the subsequent recording phase AND in the time interval t2-t3, the second current source 12 is turned on by the switching signal Sj, and the first DC source 11 is switched off by the switching signal St. Now the direct control current flows, and the control voltage Ug linearly decreases from the maximum additional value of the bias voltage Up
    The compression chamber 1 is reduced relative to the static state. Due to the overpressure, the ink meniscus bends in the tip opening to the outside and an ink lobe appears, which splits into one or a few drops.
    The magnitude of the control voltage Ug in the write phase determines the volume of the ink drop. Since the generator circuit 10 is operating stably, the volume of the individual droplets is also constant. Due to this, a uniform sequence of drops is formed.
    Phase recording is followed by a regeneration 111 phase during a time interval. In the regeneration phase, the first current source 11 is switched on again by the switching signal Sj, and the second current source 12 is switched off by the switching signal 62. At the same time, a constant control current U5 of the control voltage UQ flows linearly from the minimum value to the control bias voltage Ugv direction - direction of polarization Up.
    The squeeze chamber 1 expands to a static rotor, and from the reservoir 5 for the ink supply is supplemented by the missing amount of ink consumed in the recording phase by the formation of droplets.
    Due to the precisely controlled change in the direction of the control voltage Ug at the time instant tg, the targeted break of the ink in OT is achieved; B (Erstium of the writing tip 3, This eliminates the formation of parasitic oscillations.
    At the same time, the excess ink is sucked back into the writing tip 3 from its opening until a concave ink meniscus is formed again. Thereby, automatic cleaning of the writing tip 3 is achieved.
    At time t, the write cycle ends and, immediately after, the new write cycle can be repeated. In this case, a high following frequency is achieved, since time for calm is not required due to the absence of parasitic oscillations.
    Thanks to this control for the piezoelectric transducer 6, the time interval for each individual phase can be precisely set individually and independently of the other phases by the specific switching on and off of the current sources 11 and 12. In this way, a continuous desired change in the compression chamber 1 can be achieved by changing the control voltage.
    Due to this advantageously, each phase can be optimally matched in terms of duration and characteristic with the current ratios set by the design of the recording organ and the properties of the fluid.
    By changing the control voltage 1), the volume of the droplets can be accurately measured in recording phase II.
    In addition, the pulse energy in individual phases is constantly increasing. Consequently, an increasingly minor supply of energy is required.
    The generator circuit 10 is designed in such a way that the characteristics of the change in current and voltage do not depend on temperature and supply voltage fluctuations and therefore are stable. Due to this, a high repetition rate of the sequence of droplets, the shape of the droplets, the volume of the droplets and the exit angle of the droplets from the writing tip 3 is achieved.
    FIG. Figure 1 shows a recording organ with ink recording with only one compression chamber, and with one writing tip 3. So-called matrix or mosaic recording devices have a large number of such separately controlled compression chambers AND writing tips. In these cases, it is also possible to use the indicated current control for individual piezoelectric transducers.
    In overpressure recording devices, the recording body issues a continuous sequence of ink drops. Ink drops, depending on the character generator, are electrically charged and, depending on the charge, are deflected in an electric constant field or on a desiccant medium or in an ink SHIPPING. A continuous sequence of droplets is formed or as described — by changing the volume of the compression chamber, or by mechanically vibrating the writing tip with a piezoelectric transducer.
    Since the formation of droplets must be synchronized with the character generator, it is extremely advantageous to have a high stability of the sequence of the droplets and their volume.
    FIG. 3 shows an exemplary embodiment of a cxeMiii oscillator 17 of a signal LB / preempting digital switching signals S and
    The signal generator 17 consists essentially of three successively included elements 22 to 24 of delays in the form of monostable multivibrators, the delay times T, T, T of which can be adjusted.
    The first delay element 22 receives a write command via line 18. The output signals of delay elements 22 and 24 are connected via an IS-NOT element 25, the output of which appears on line 15 is a digital switching signal Si The output signal of element 23 corresponds to a digital switching signal S2 on wire 16 .
    The principle of the signal generator 17 is explained using the diagrams in FIG. 4, where So corresponds to the write command and the output signal of element 22, 5 of the switching signal and the output signal of element 24, Si, the switching signal. The pulse diagram is identical to the control current 3s and control voltage diagrams Us in FIG. 2
    The write cycle is performed by the write command 5, which starts the element 22. The delay element 22 triggers the delay element 23 after a delay time T ,. A delay of 7 delays triggers a delay of 24 delays. Through time T | delay appears the output signal on delay element 24.
    0
    The delay time T determines the duration of the preparatory phase 1, the delay time Tg is the duration of the recording phase 11 and the delay time T is the duration of the regeneration phase Ml.
    five
    If the currents J (and Jy are equal in magnitude, then is chosen and, For different currents J and Jj, the delay times change accordingly
    0 so that, at the end of the recording cycle, again reach the initial state of the Control Voltage Us on the piezoelectric transducer b.
    five
    The use of the invention improves the control performance of the ink recording organ.
     5/77
    jr
    1 / p
    U
    Sff
    114% tL
    It ml
    fl
    tf 2. 4
    权利要求:
    Claims (2)
    [1]
    1, A method for controlling an ink recording body, comprising
    L
    LZZZZZZZZ ^ duration.
    The expansion and expansion of an ink recording organ using a piezoelectric transducer distinguishes it by the fact that, in order to increase the efficiency of controlling an ink recording organ, they fix the static state of an ink recording organ, then expand its static state and compress it to a state exceeding the static, and expand to a static state, after which the operations are repeated, and the compression and ; expansion is carried out due to the flow through a piezoelectric transducer im * ·: pulse current, the pulses of which have opposite polarity and alternating
    [2]
    2, A device for controlling an ink recording organ / comprising a piezoelectric transducer located on an ink recording organ, characterized in that: in order to increase the control efficiency, it has current sources, switches and a signal generator, and the outputs of the current sources are connected to the piezoelectric transducer by means of switches interconnected, the control inputs of which are connected to the corresponding outputs of the signal generator. <<.
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR2432936A1|1980-03-07|
    JPS5528893A|1980-02-29|
    FR2432936B1|1983-10-28|
    NL7905598A|1980-02-13|
    IT1165272B|1987-04-22|
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    MX147262A|1982-10-28|
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19782835262|DE2835262C2|1978-08-11|1978-08-11|Control of an ink jet recording element|
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