JP5127649B2 - Liquid ejection device - Google Patents

Liquid ejection device Download PDF

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Publication number
JP5127649B2
JP5127649B2 JP2008251032A JP2008251032A JP5127649B2 JP 5127649 B2 JP5127649 B2 JP 5127649B2 JP 2008251032 A JP2008251032 A JP 2008251032A JP 2008251032 A JP2008251032 A JP 2008251032A JP 5127649 B2 JP5127649 B2 JP 5127649B2
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liquid
flow path
discharge
supply
pump
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JP2010082811A (en
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真人 片田
哲三 門松
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富士フイルム株式会社
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/17Ink jet characterised by ink handling
    • B41J2/175Ink supply systems ; Circuit parts therefor
    • B41J2/17596Ink pumps, ink valves
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/8593Systems
    • Y10T137/85978With pump
    • Y10T137/85986Pumped fluid control

Description

  The present invention relates to a liquid discharge apparatus, and more particularly to a liquid discharge apparatus using a pump.

  In an ink jet type liquid ejecting apparatus, means for circulating liquid in a flow path using an urging means such as a pump is known in order to prevent drying of a nozzle meniscus portion of a print head. For example, Patent Document 1 discloses that a liquid level in an ink tank is used as means for adjusting the pressure of an ink tank that is a pressure source by arranging a first pressure source and a second pressure source on the inlet side and the outlet side of the head, respectively. A method of controlling the pressure of the air above the ink tank while maintaining the height by a liquid pump or a method of controlling the pressure by changing the height position of the ink tank is disclosed.

Patent Document 2 discloses a technique related to ink circulation for a long head. In this technique, a pressure pump is directly communicated with the head, and it is shown that the rotational speed of the pump is determined so that the head has a predetermined pressure.
JP 2007-313848 A JP 2006-175651 A

  However, in the technique disclosed in Patent Document 1, when applied to a system that circulates and consumes a large amount of ink, such as a line head, there arises a problem that the control speed is not in time. Further, in the method of controlling the pressure by the liquid level, air is present above the ink in the tank, so that bubbles flow into the head, the air melts into the ink, and the like, resulting in ejection failure.

  In addition, the technique disclosed in Patent Document 2 has a problem in that no device for keeping the pressure constant precisely is shown.

  As described above, the conventional technique has a problem that it is difficult to precisely control the amount of liquid fed in the flow path.

  In view of the above problems, an object of the present invention is to provide a liquid ejection apparatus that can precisely control the amount of liquid fed in a flow path.

In order to achieve the above object, the invention of claim 1 is provided with a supply port for supplying a liquid and a discharge port for discharging the liquid, a discharge head for discharging the supplied liquid, and supplying the liquid to the supply port. supply flow path for supplying, and the a liquid feed passage having a discharge passage through which liquid to be discharged from the discharge port, Meinpon flop feeding a liquid in the supply passage at a constant flow rate, the feed stream provided in the road parallel to the main pump, the a liquid feed section having a sub-pump to feed at low flow than the flow rate of the liquid in the supply flow path the main pump, the pressure of liquid in the supply passage Detecting means for detecting the liquid, and the liquid sent by the sub pump so that the pressure of the liquid in the supply channel detected by the detecting means is a predetermined pressure. Control means for controlling the flow rate; And said that there were pictures.

Here, in the first aspect of the invention, the discharge head is provided with a supply port for supplying the liquid and a discharge port for discharging the liquid, discharges the supplied liquid, and supplies the liquid to the supply port. supply passage, and liquid channel transmission having a discharge passage through which liquid to be discharged is provided from the discharge port, the main pump, and feeding a liquid in the supply passage at a constant flow rate, the sub-pump is provided in parallel with the main pump to the supply passage, wherein by feeding the liquid in the supply flow path with a small flow rate than the flow rate of the main pump, the detecting means, the liquid in the supply passage detecting the pressure control means, the is fed by the main pump, and the sub-pump such that the pressure of the liquid becomes a predetermined pressure in the supply passage which is detected by the detection means feeding Controls the flow rate of the liquid in the flow path. It is possible to provide a liquid ejecting apparatus capable of precisely controlling the liquid supply amount.
The invention of claim 2 is provided with a supply port for supplying a liquid and a discharge port for discharging the liquid, a discharge head for discharging the supplied liquid, a supply channel for supplying the liquid to the supply port, and the A liquid supply passage having a discharge passage through which liquid discharged from the discharge port flows, a main pump for sending the liquid in the discharge passage at a constant flow rate, and in parallel with the main pump in the discharge passage A liquid feeding section provided with a sub-pump for feeding the liquid in the discharge flow path at a lower flow rate than the flow rate of the main pump, detection means for detecting the pressure of the liquid in the discharge flow path, Control means for controlling the flow rate of the liquid fed by the sub-pump so that the pressure of the liquid in the discharge flow path which is fed by the main pump and detected by the detection means becomes a predetermined pressure; It is provided with.
Here, in the invention of claim 2, the discharge head is provided with a supply port for supplying the liquid and a discharge port for discharging the liquid, and discharges the supplied liquid and supplies the liquid to the supply port. And a liquid supply flow path including a flow path through which the liquid discharged from the discharge port flows, the main pump sends the liquid in the discharge flow path at a constant flow rate, and the sub pump Provided in parallel with the main pump in the discharge flow path, the liquid in the discharge flow path is sent at a lower flow rate than the flow rate of the main pump, and the detecting means controls the pressure of the liquid in the discharge flow path. And the control means detects the liquid sent by the sub pump so that the liquid pressure in the discharge flow path detected by the detection means becomes a predetermined pressure. Since the flow rate is controlled, the liquid flow in the flow path is controlled. It is possible to provide a liquid ejecting apparatus capable of precisely controlling the amount.
The invention of claim 3 is provided with a supply port for supplying a liquid and a discharge port for discharging the liquid, a discharge head for discharging the supplied liquid, a supply channel for supplying the liquid to the supply port, and the A liquid supply passage having a discharge passage through which liquid discharged from the discharge port flows, a first main pump for sending the liquid in the supply passage at a constant flow rate, and the first in the supply passage. A first liquid-feeding section provided in parallel with the main pump, and having a first sub-pump for feeding the liquid in the supply flow path at a flow rate smaller than that of the first main pump; A second main pump for feeding liquid at a constant flow rate, and is provided in parallel with the second main pump in the discharge flow path, and the liquid in the discharge flow path is less than the flow rate of the second main pump. A second liquid feeding section having a second sub-pump for feeding the liquid, and the supply First detection means for detecting the pressure of the liquid in the channel, second detection means for detecting the pressure of the liquid in the discharge flow path, and liquid fed by the first main pump, and by the first detection means The flow rate of the liquid fed by the first sub-pump is controlled so that the detected pressure of the liquid in the supply flow path becomes a predetermined pressure, and the liquid is fed by the second main pump, and Control means for controlling the flow rate of the liquid sent by the second sub-pump so that the pressure of the liquid in the discharge channel detected by the second detection means becomes a predetermined pressure. Features.
In particular, as in the third aspect of the invention, if the sub-pump and the detection means are provided in both the supply flow path and the discharge flow path, and the above-described control is performed, the amount of liquid fed in the flow path can be made more precise. Can be controlled.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the supply flow path and the discharge flow path are each provided with a main pump, and the drive source for driving the main pump is the same.

According to the fourth aspect of the present invention, the liquid discharge device is less expensive than the case where the main pumps are provided in the supply flow path and the discharge flow path, respectively, and the drive sources are the same, thereby providing the drive sources. Can be provided.

  According to the present invention, it is possible to provide an effect that it is possible to provide a liquid ejection apparatus that can precisely control the amount of liquid fed in a flow path.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, liquid is expressed as ink. In addition, an ink jet recording apparatus is taken as an example of the liquid ejection apparatus.

  FIG. 1 is a diagram illustrating a configuration of a liquid ejection apparatus according to the present embodiment. As shown in the figure, the liquid ejection device is roughly divided into a pump, a tank, a valve, a ejection head (hereinafter referred to as a head), and a deaeration device that indirectly reduces bubbles contained in the ink. .

  Among these, the head is provided with a supply port for supplying ink and a discharge port for discharging ink, and discharges the supplied ink. And although two heads are drawn in the same figure, the number of heads may be one or three or more.

  In that case, the flow path connecting each head to the supply tank 28 and the recovery tank 30 is increased or decreased according to the number of heads, and accordingly, the flow path connecting the head to the supply tank 28 and the recovery tank 30 is provided. The valve will also increase or decrease.

  Further, in the configuration shown in the figure, the flow path from the buffer tank 20 to the deaeration device 24, the buffer tank 26, the pump 18A (main pump), the pump 18B (sub pump), the supply tank 28, and the heads 10A and 10B. Is a supply flow path. Furthermore, the flow path from the heads 10A and 10B to the recovery tank 30, the pumps 18C and 18D, and the buffer tank 20 is a discharge flow path.

  Each configuration will be described below. The main tank 22 is an ink cartridge and is detachable from the liquid ejection device. The main tank 22 and the buffer tank 20 are connected by a flow path so that ink flows from the main tank 22 to the buffer tank 20.

  The buffer tank 20 and the deaeration device 24 are connected by a flow path. The deaerator 24 reduces the bubbles indirectly by discharging the air dissolved in the liquid by depressurizing the ink with a vacuum pump etc. through a gas permeable membrane (generally a hollow fiber membrane). It is something to be made.

  The ink flowing from the buffer tank 20 is deaerated by the deaeration device 24. Further, the deaerator 24 and the buffer tank 26 are connected by a flow path, and the ink deaerated by the deaerator 24 flows through the buffer tank 26.

  The buffer tank 26 and the supply tank 28 are connected by a flow path via pumps 18A and 18B.

  As shown in the figure, the pump 18A is provided in a flow path connecting the supply ports of the heads 10A and 10B and the discharge ports of the heads 10A and 10B, and sends the liquid in the flow paths at a constant flow rate. Liquid. On the other hand, the pump 18B is provided in parallel with the pump 18A and sends the liquid in the flow path.

  The supply tank 28 is a tank for temporarily storing ink in order to supply ink to the heads 10A and 10B.

  The supply tank 28 is provided with a pressure sensor 14 that detects the pressure of ink in the supply tank 28, that is, the pressure of ink in the supply flow path. The supply tank 28, the head 10A, and the head 10B are connected to each other through flow paths via valves 12A and 12B, respectively.

  The valves 12A, 12B, 12C, and 12D are, for example, electromagnetic valves, and are valves for stopping the ink supply for each of the heads 10A and 10B.

  The head 10 </ b> A and the head 10 </ b> B are formed with a flow path communicating with the supply port and the discharge port, and discharge the ink supplied into the flow path.

  Further, the head 10A, the head 10B, and the recovery tank 30 are connected to each other through flow paths via valves 12C and 12D, respectively. The collection tank 30 is a tank for temporarily collecting ink collected from the heads 10A and 10B.

  The recovery tank 30 is provided with a pressure sensor 16 that detects the pressure of the ink in the recovery tank 30, that is, the pressure of the ink in the discharge channel. The recovery tank 30 and the buffer tank 20 described above are connected by a flow path through a pump 18C (main pump) and a pump 18D (sub pump).

  As shown in the figure, the pumps 18A and 18B and a pump that sends the liquid in the discharge flow path to the discharge flow path that is the other flow path not provided with the pressure sensor 14 with a constant driving force. 18C, a pump 18D that is provided in parallel with the pump 18C and sends the liquid in the discharge flow path, and a pressure sensor 16 that detects the pressure of the liquid in the discharge flow path are further provided.

  With the configuration described above, ink is supplied from the buffer tank 20 to the heads 10A and 10B via the deaerator and the ink discharged from the heads 10A and 10B flows again to the buffer tank 20.

  The above-described pumps 18A and 18C can be one-way pumps (diaphragm pumps, piston pumps, etc.), and inexpensive and long-life pumps can be selected. On the other hand, the pumps 18B and 18D are pumps that can control the flow rate of a liquid with a small flow rate with higher accuracy than the pumps 18A and 18C, and are pumps (tubes) that can also feed liquids in the forward and reverse directions. Pumps, gear pumps, etc.).

  In this way, one uses a pump with a constant flow rate and a large amount of liquid delivered, and the other uses a highly accurate pump, so that the amount of liquid delivered in the flow path can be accurately adjusted regardless of the amount of liquid delivered in the flow path. It can be possible to control. Compared to the case of using a high-precision and large-flow pump, by sharing the role of a plurality of pumps, the degree of freedom in selecting pumps is increased, and an inexpensive and high-precision ink ejection device is configured. Can do.

  The structure of the supply tank 28 and the recovery tank 30 described above may be a damper structure in order to absorb abrupt pressure fluctuation of ink.

  Moreover, each pump 18A-18D may each be comprised with the some pump as needed. For example, the main pumps 18A and 18C may be composed of a plurality of pumps that send liquid in the flow path at a constant flow rate. Further, the sub-pumps 18B and 18D may be composed of a plurality of pumps capable of controlling the flow rate of the liquid fed by the control means.

  Next, the electrical configuration of the liquid ejection apparatus will be described with reference to FIG. As shown in the figure, the electrical configuration of the liquid ejection device includes a control unit 40, a valve control unit 42, a pump control unit 44, a motor drive switch 46, and a motor 48.

  Among these, the control unit 40 includes a CPU (Central Processing Unit), a ROM (Read Only Memory) in which a program for executing a flowchart to be described later is recorded, a RAM (Random Access Memory) in which various information is stored, and the like. The pump controller 44, the valve controller 42, the pressure sensors 14 and 16, and the motor drive switch 46 are connected to control the entire liquid ejecting apparatus.

  Specifically, the control unit 40 controls the driving force of the pump 18B so that the pressure of the liquid in the supply flow path detected by the pressure sensor 14 becomes a predetermined pressure. In addition, the control unit 40 controls the driving force of the pump 18D so that the pressure of the liquid in the discharge channel detected by the pressure sensor 16 becomes a predetermined pressure.

  That is, the control unit 40 increases the driving force of the pumps 18B and 18D so that the pressure of the liquid in each flow path detected by the pressure sensors 14 and 16 becomes a predetermined pressure for each flow path. Control.

  The valve control unit 42 opens and closes each valve according to instructions from the control unit 40.

  The pump control unit 44 controls the driving force of each pump 18B, 18D by changing the rotational speed of the motor that drives the pumps 18B, 18D according to an instruction from the control unit 40.

  The motor drive switch 46 is a switch for driving the motor 48 according to an instruction from the control unit 40. When the switch is turned on, the motor 48 is driven, and when the switch is turned off, the motor 48 stops driving. Thus, in the present embodiment, the motor 48 that is a drive source for driving the pump 18A and the pump 18C is the same. Thereby, a further inexpensive liquid discharge apparatus can be provided.

  Processing executed with the above-described configuration will be described using a flowchart. The process of the flowchart described below is executed by the control unit 40.

  First, the flow of the pressure control process according to the present embodiment will be described using the flowchart of FIG. First, in step 101, the control unit 40 acquires the pressures of the supply flow path and the discharge flow path. This pressure can be acquired by the pressure sensors 14 and 16.

  In the next step 102, the control unit 40 determines whether or not the pressure X of the supply flow path is equal to a predetermined pressure P1. Here, the predetermined pressure P1 and P2, which will be described later, are pressures determined in advance by considering elements such as the members constituting the flow path and the heads 10A and 10B.

  If an affirmative determination is made in step 102, the control unit 40 performs a supply channel pressure control process, which will be described later, in step 104, and ends the process.

  On the other hand, when a negative determination is made in step 102, the control unit 40 determines whether or not the pressure Y of the discharge flow path is equal to a predetermined pressure P2 in step 103. If a negative determination is made in step 103, the pressures in the supply flow path and the discharge flow path are predetermined pressures, so the process is terminated as it is.

  If an affirmative determination is made in step 103, the control unit 40 performs a pressure control process for the discharge passage, which will be described later in step 105, and ends the process.

  In steps 102 and 103 described above, it is determined whether or not the pressure is different from the predetermined pressure. However, the predetermined pressure may have a width. That is, when the acquired pressure Z satisfies p <Z <q (p and q are pressures), it may be determined that Z is a predetermined pressure.

  Next, the flow of the pressure control process for the supply flow path in step 104 will be described with reference to the flowchart of FIG. First, in step 201, the control unit 40 determines whether or not the pressure X of the supply flow path is greater than a predetermined pressure P1. When an affirmative determination is made in step 201, the control unit 40 instructs the pump control unit 44 to reduce the flow rate of the liquid that is pumped by the pump 18B in step 202, and ends the process.

  On the other hand, if a negative determination is made in step 201, the control unit 40 instructs the pump control unit 44 to increase the flow rate of the liquid fed by the pump 18B in step 203, and ends the process.

  Next, the flow of the pressure control process for the discharge channel in step 105 will be described with reference to the flowchart of FIG. First, in step 301, the control unit 40 determines whether or not the pressure Y in the discharge channel is greater than a predetermined pressure P2. If an affirmative determination is made in step 301, the control unit 40 instructs the pump control unit 44 to reduce the flow rate of the liquid sent by the pump 18D in step 302, and ends the process.

  On the other hand, if a negative determination is made in step 301, the control unit 40 instructs the pump control unit 44 to increase the flow rate of the liquid fed by the pump 18 </ b> D in step 303, and ends the process.

  In the pressure control process for the supply and discharge channels described above, when controlling the pressure of the channel, the liquid may be controlled to flow not only in the forward direction but also in the reverse direction.

  The processing flow of each flowchart described above is an example, and the processing order may be changed, new steps may be added, or unnecessary steps may be deleted without departing from the scope of the present invention. Needless to say, you can.

It is a figure which shows the structure of the liquid discharge apparatus which concerns on embodiment. It is a figure which shows the electrical structure of the liquid discharge apparatus which concerns on embodiment. It is a flowchart which shows the flow of a pressure control process. It is a flowchart which shows the flow of the pressure control process of a supply flow path. It is a flowchart which shows the flow of the pressure control process of a discharge flow path.

Explanation of symbols

10A, 10B Head 12A, 12C, 12B, 12D Valve 14, 16 Pressure sensor 18A, 18B, 18C, 18D Pump 20, 26 Buffer tank 22 Main tank 24 Deaerator 28 Supply tank 30 Recovery tank 40 Control unit 42 Valve control unit 44 Pump control unit 46 Motor drive switch 48 Motor

Claims (4)

  1. A discharge port that discharges the supplied liquid provided with a supply port for supplying the liquid and a discharge port for discharging the liquid;
    A liquid feeding passage with supply flow path for supplying the liquid, and a discharge passage through which liquid to be discharged from the discharge port to said supply port,
    The Meinpon flop feeding a liquid at a constant flow rate in the supply passage, wherein the supply passage is provided in parallel with the main pump, the liquid in the supply passage at a low flow than the flow rate of the main pump A liquid feed section having a sub-pump for feeding liquid ;
    Detecting means for detecting the pressure of the liquid in the supply channel;
    Control means for controlling the flow rate of the liquid fed by the sub-pump so that the pressure of the liquid in the supply flow channel which is fed by the main pump and detected by the detection means becomes a predetermined pressure; ,
    A liquid ejection apparatus comprising:
  2. A discharge port that discharges the supplied liquid provided with a supply port for supplying the liquid and a discharge port for discharging the liquid;
    A liquid supply flow path including a supply flow path for supplying liquid to the supply port, and a discharge flow path through which the liquid discharged from the discharge port flows;
    A main pump for sending the liquid in the discharge flow path at a constant flow rate, provided in parallel with the main pump in the discharge flow path, and the liquid in the discharge flow path at a flow rate smaller than the flow rate of the main pump. A liquid feed section having a sub-pump for feeding liquid;
    Detecting means for detecting the pressure of the liquid in the discharge channel;
    Control means for controlling the flow rate of the liquid fed by the sub-pump so that the pressure of the liquid in the discharge flow path which is fed by the main pump and detected by the detection means becomes a predetermined pressure; ,
    A liquid ejection apparatus comprising:
  3. A discharge port that discharges the supplied liquid provided with a supply port for supplying the liquid and a discharge port for discharging the liquid;
    A liquid supply flow path including a supply flow path for supplying liquid to the supply port, and a discharge flow path through which the liquid discharged from the discharge port flows;
    A first main pump for feeding the liquid in the supply channel at a constant flow rate; the first main pump in the supply channel is provided in parallel with the first main pump; and the liquid in the supply channel is supplied to the first main pump A first liquid feeding unit including a first sub-pump for feeding a liquid at a smaller flow rate than the flow rate of
    A second main pump for sending the liquid in the discharge flow path at a constant flow rate; the second main pump in the discharge flow path is provided in parallel with the second main pump; and the liquid in the discharge flow path is supplied to the second main pump A second liquid-feeding section having a second sub-pump for feeding a liquid at a smaller flow rate than the flow rate of
    First detection means for detecting the pressure of the liquid in the supply channel;
    Second detection means for detecting the pressure of the liquid in the discharge channel;
    The flow rate of the liquid fed by the first main pump and fed by the first sub-pump so that the pressure of the liquid in the supply flow path detected by the first detection means becomes a predetermined pressure. And the second sub-pump is fed by the second main pump so that the pressure of the liquid in the discharge channel detected by the second detection means becomes a predetermined pressure. Control means for controlling the flow rate of the liquid to be liquid;
    A liquid ejection apparatus comprising:
  4. The liquid discharge apparatus according to claim 3 , wherein a drive source for driving the first main pump and the second main pump is the same.
JP2008251032A 2008-09-29 2008-09-29 Liquid ejection device Active JP5127649B2 (en)

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JP5754976B2 (en) 2010-03-31 2015-07-29 キヤノン株式会社 Image processing apparatus and control method
WO2013042457A1 (en) * 2011-09-21 2013-03-28 コニカミノルタIj株式会社 Inkjet recording apparatus
JP2016221817A (en) * 2015-05-29 2016-12-28 株式会社東芝 Ink supply device and inkjet device
JP2017065159A (en) * 2015-09-30 2017-04-06 富士フイルム株式会社 Printer and ink circulation control method

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US3383044A (en) * 1965-08-09 1968-05-14 Britt Tech Corp Hydraulically controlled pressure washer
JPH10237676A (en) * 1997-02-24 1998-09-08 Dainippon Screen Mfg Co Ltd Resist applying device
US6164557A (en) * 1998-04-30 2000-12-26 Sioux Steam Cleaner Corporation Fluid temperature control for a heated fluid cleaner with multiple outlets
JP2003145790A (en) * 2001-11-09 2003-05-21 Canon Inc Ink jet recorder
US6769766B2 (en) * 2001-12-28 2004-08-03 Konica Corporation Inkjet printer utilizing white ink
US7597434B2 (en) * 2006-04-27 2009-10-06 Toshiba Tec Kabushiki Kaisha Ink-jet apparatus and method of the same
JP5728148B2 (en) * 2006-04-27 2015-06-03 東芝テック株式会社 Ink jet apparatus and control method thereof

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