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21. 发明专利

JPH0677995B2 失效
公开(公告)号：JPH0677995B2
公开(公告)日：1994-10-05
申请号：JP5249786
申请日：1986-03-12
申请人： HITACHI SEISAKUSHO KK , HITACHI SEIKO KK , HITACHI KOKI KK
发明人： NAMEKAWA SATOSHI , YAMADA TAKEHIRO , MATSUDA YASUMASA , SAKATA MASATOSHI
IPC分类号： B41J2/115 , B41J2/07 , B41J2/20

22. 发明专利

JPH0643131B2 失效
公开(公告)号：JPH0643131B2
公开(公告)日：1994-06-08
申请号：JP5228684
申请日：1984-03-21
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： SAKAE MASAJI , MATSUDA YASUMASA
IPC分类号： B41J2/07 , B41J2/115 , B41J2/125

23. 发明专利

JPS61290061A INK JET RECORDER 失效
公开(公告)号：JPS61290061A
公开(公告)日：1986-12-20
申请号：JP13189385
申请日：1985-06-19
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MATSUDA YASUMASA , SAKAE MASAJI , KASAHARA MASATOSHI
IPC分类号： B41J2/18 , B41J2/01 , B41J2/015 , B41J2/045 , B41J2/055 , B41J2/17 , B41J2/185 , B41J2/19
摘要： PURPOSE:To eliminate a special ink gathering equipment by gathering the ink to be sucked when bubbles are removed in a nozzle head, by a method wherein an ink gathering part is solidly installed in the nozzle head and the ink to be sucked when bubbles are removed, is established. CONSTITUTION:When bubbles are removed, the piston 106 of a suction pump 104 is shifted in the direction indicated by an arrow mark D and the air in the ink gathering part 30 is sucked via pipe 103, a cap 102, and a suction pipe 32. Then, because a valve 22 is closed and a valve 35 is opened, the concave surface 1a of nozzle 10 becomes of negative pressure via an interconnecting tube 34 and the ink 21 in an ink tank 20 is sucked via an orifice 15, a nozzle pipe 11, a pipe 13, and a filter 14. Therefore, the bubbles in the nozzle pipe 11 are discharged together with the ink 21 to the ink gathering part 30 through the concave part 1a of nozzle 10 and the interconnecting tube 34. Because the discharged ink 21 is absorbed with the absorption material 31 of porous material, it never flows outside the nozzle head 1.

24. 发明专利

JPS60260339A INK DRIP JETTING DEVICE 失效
公开(公告)号：JPS60260339A
公开(公告)日：1985-12-23
申请号：JP11648784
申请日：1984-06-08
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KUWABARA TEIJI , SAKAE MASAJI , KASAHARA MASATOSHI , MATSUDA YASUMASA
IPC分类号： B41J2/165 , B41J2/175
摘要： PURPOSE:To make the useless transfer of a heat unnecessary, by uniting at least a part of the constitutional elements of the apparatus realizing the jet abnormality detection measure of ink drips and the cap device covering a nozzle hole when not printed into one body. CONSTITUTION:When printing is started from a non-printing state, because a cap 9 covers a nozzle hole 61, the cap 9 is separated from a head 30 by closing a switch 16 and ink is charged with electricity by closing a switch 7. The charged ink particle is jetted out by driving an electromechanical conversion element 4. When drips one normally jectted out, current flows to a current detection circuit 18 via a detection electrode 10 to be confirmed. On the other hand, when not normally jetted out, even though a fixed time has elapsed after driving the conversion element 4, current does not flow to the detection circuit 18. When jet abnormality is detected, the switches 7 and 16 are opened and the nozzle 61 is covered with the cap 9 again. Then, the operation of purge is started. Thus, the arranging space of components can be miniaturized.

25. 发明专利

JPS60222259A INKJET RECORDER 失效
公开(公告)号：JPS60222259A
公开(公告)日：1985-11-06
申请号：JP7855384
申请日：1984-04-20
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： SAKAE MASAJI , MATSUDA YASUMASA
IPC分类号： B41J2/13 , B41J2/115
摘要： PURPOSE:To enable a stable reciprocative recording by adding a function of checking for abnormality of bias voltage utilizing a phase detector for detecting the timing of the generation of ink particles. CONSTITUTION:Abnormality of bias voltage generation circuits 41a and 41b is detected with a deflection electrode 38 and a phase detection circuit 42. In other words, while the generation of a signal voltage Vaig for recording is halted, only bias voltages Va and Vb are applied selectively to charge electrodes 36a and 36b one at a time to charge ink particles and then, the charged condition of the ink particles is detected to determine the presence of abnormality. In the normal recording state, an inkjet recording section shifts about 1sec in the direction X or X' with the frequency of the bias voltages Va and Vb being about 0.5Hz. Thus, a function of detecting an induced current of the 0.5Hz is added to the phase detection circuit 42 and judges that the generation of the bias voltages Va and Vb is abnormal when no such induced current is detected.

26. 发明专利

JPS57133081A INK PARTICLE MAKING DEVICE 失效
公开(公告)号：JPS57133081A
公开(公告)日：1982-08-17
申请号：JP1907381
申请日：1981-02-13
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： SAKAE MASAJI , YAMADA TAKEHIRO , MATSUDA YASUMASA , YOSHINO EIJI
IPC分类号： B41J2/02
摘要： PURPOSE:To make it possible to produce stable and uniform ink particles by setting the frequency of exciting voltage at a specified value in relation to the resonant frequency of liquid in a nozzle in a device to make ink particles by exciting pressurized ink in the nozzle. CONSTITUTION:Pressurized ink 14 supplied to a nozzle 11 is subjected to vibration by the fact that an electromechanical conversion element 12 is applied exciting voltage Ve from an exciting source 13 and excited, and the vibration is transmitted to an ink column 1 to separate ink into ink particles. Here, the fluid resonant frequency fr of the ink 14 in the nozzle 11 is shown by the formula (in the formula C is the velocity of sound in the ink 14, L is the length of the nozzle, and (n) is an integral number over 1). Ink particles 2 with always uniform size are obtained even if nozzles in which spread of manufacture accuracy is found are used by setting the frequency of the exciting voltage V of an electromechanical conversion element 12 that is mounted on a nozzle such as the nozzle 11 at F=fr/2(1-a).

27. 发明专利

JPS5715973A INK SUPPLY DEVICE 失效
公开(公告)号：JPS5715973A
公开(公告)日：1982-01-27
申请号：JP9059080
申请日：1980-07-04
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： UCHIDA HIROYASU , MATSUDA YASUMASA
IPC分类号： B41J2/18 , B41J2/175 , B41J2/185 , B41J2/19
摘要： PURPOSE:To securely discharge the bubbles formed in an ink in a head and prevent the ink from clogging up a nozzle through drying, by a method wherein an ink in an ink cartridge is supplied to a head through a tube which is connected to a suction pump. CONSTITUTION:The ink cartridge 6 is fitted to a cartridge receiver 12, the head 1 is fixed at a neutral position, a solenoid 19 is brought into a nonconducting state by a plunger 16, the head 1 is pressed against a nozzle side end face and a contacting part at the periphery of the nozzle 2c is sealed by a packing 17. Then, with a valve 27 closed, the suction pump 26 is operated to reduce the pressure in an ink recovering chamber 7c, a tube 22, an ink passage 16a within the plunger 16 and the head 1, and the ink 10 contained in an ink bag 9 is filled into a pump chamber 2b and the nozzle 2c within the head 1 through the tube 21. Thereafter, the valve 27 is opened to return the pressure in the ink recovering chamber 7c to the atmospheric pressure, and the ink is filled in the head 1.

28. 发明专利

JPS56146765A DROPLET INJECTION DEVICE 失效
公开(公告)号：JPS56146765A
公开(公告)日：1981-11-14
申请号：JP4917280
申请日：1980-04-16
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： UCHIDA HIROYASU , ISHIHARA TAMIO , MATSUDA YASUMASA
IPC分类号： B41J2/045 , B41J2/055 , B41J2/19
摘要： PURPOSE:To eliminate the generation of bubbles and record informations correctly by a method wherein the second pump chamber having the same constitution as a main pump chamber is provided in series and ink in the main chamber is pre-pressurized by the function of the second chamber, thereafter, the ink droplet is injected. CONSTITUTION:The subpump chamber 11d having the same constitution as the main pump chamber 11b is provided in series between the main pump chamber 11b and a liquid supplying path 11e. A pressure wave is generated in the subpump chamber 11d by impressing an auxiliary signal and is propagated to the main pump chamber 11b through a liquid diode section 11c to prepressurize the ink in the chamber 11b. Immediately thereafter, the pressure of the liquid ink in the chamber 11b is increased by outputting a control signal and the ink is injected from a nozzle 11a as an ink droplet. In this case, the smaller volumetric variation of the chamber 11b necessary for the ink droplet injection becomes sufficient enough to continue the function by a volume corresponding to the prepressurizing of the main pump chamber 11b, therefore, generation of cavitation in the chamber 11b and inducing of air in the nozzle section 11a may be prevented.

29. 发明专利

JPS56126172A LIQUID DROP INJECTOR 失效
公开(公告)号：JPS56126172A
公开(公告)日：1981-10-02
申请号：JP2917780
申请日：1980-03-10
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MATSUDA YASUMASA , MUKUMOTO KIYOUJI , SAKAE MASAJI , KASAHARA MASATOSHI
IPC分类号： B41J2/045 , B41J2/055 , B41J2/12 , B41J2/205 , G06K15/10
摘要： PURPOSE:To provide a subject device, for use with an ink jet printer, which is provided with a liquid diameter correcting means for adjusting a size of an electric signal to be applied to an electromechanical transducing part, and can prevent the liquid diameter from changing after quiescence of said electric signal. CONSTITUTION:Liquid from a liquid feed tank is caused to operate an electromechanical transducing part 18 according to an electric signal applied to cause a change in volume, and printing is conducted on a recording sheet by jetting liquid drops through a liquid drop jet head 1. In case a quiescent period T being wider than a given width is set at a pattern of an electric signal applied to the electromechanical transducing part and at least 3 consecutive electric signals are then set, a liquid drop diameter correction means, for example, a variable amplifier 27, which increases a size or width of the second electric signal out of the 3 consecutive electric signals, is mounted to correct a liquid diameter rs. The first liquid drop diameter rl tends to be too large and the second one tends to become too samll: such tendency is corrected.

30. 发明专利

JPS56113367A LIQUID DROP SPRAYER 失效
公开(公告)号：JPS56113367A
公开(公告)日：1981-09-07
申请号：JP1662680
申请日：1980-02-15
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MATSUDA YASUMASA , SAKAE MASAJI , KASAHARA MASATOSHI , MUKUMOTO KIYOUJI
IPC分类号： B05B17/04 , B05B1/02 , B41J2/045 , B41J2/055 , B41L27/10
摘要： PURPOSE:To accurately and efficiently control a temperature of a nozzle head, by providing the nozzle head made of low electric-resistant silicon, forming a high resistant layer composed of the silicon impregnated with a certain amount of impurities, and supplying an electric current to the nozzle. CONSTITUTION:A sprayer has a nozzle part 1 for injecting liquid drops, conduits 2, 4 for introducing an ink liquid to the nozzle part 1, an electroacoustic transducing parts 3 and a common liquid reservoir 6 between a Pyrex glass base 19 and a main body 18. The main body 18 is composed of monocrystalline silicon. Each part from the nozzle part 1 to the liquid reservoir 6 is formed in a groove shape by chemical etching the silicon plate 18. At the nozzle side near the conduits, the main body 18 is provided with a heating resistor 17 which is composed of a high resistant layer having a high impurity content by dispersing boron or the like element into the silicon plate 18. When an electric current is supplied from lead terminals 21, 21', a heat is generated by the high resistor 17, and the temperature, viscosity, etc. of the ink liquid can be satisfactory controlled without any deviation.

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