JP6216201B2 - Inkjet recording device - Google Patents

Description

  The present invention relates to an ink jet recording apparatus that continuously ejects ink particles, and more particularly to stirring of ink in an ink container.

  The ink jet recording apparatus sucks ink from an ink container with a pump, supplies ink to a nozzle through an ink filter and a pressure regulating valve that adjusts ink pressure, generates ink particles by vibrating the ink ejected from the nozzle, By charging and deflecting the ink particles, the ink particles reach the recording medium to perform recording. Ink is continuously ejected from the nozzles, and ink particles that are not used for recording are collected from the gutter part, returned to the container containing the ink by the power of the pump, and supplied to the nozzles again. Yes.

  When printing on dark colors such as black on the surface of the recording medium, it is impossible to read characters printed in the same color as the surface of the recording medium with dye-based inks that are widely used. Printing is performed using a system ink or a complementary color.

  When the pigment-based ink is left in a container for storing the ink for a long time, there is a problem that a pigment that is one of the components of the ink settles. If circulation is performed in which the ink is supplied to the nozzle and collected with the dye settling, clogging occurs in the circulation path. In addition, the color to be printed on the recording medium is uneven, which causes a problem that the recorded character is difficult to recognize as a character. Ink jet recording apparatuses using such pigment-based inks require a mechanism for stirring the ink in the container in order to prevent troubles. Recently, titanium-based pigments are mixed and ink is used with stirring to prevent precipitation.

  Regarding an ink jet recording apparatus using a pigment-based ink, an apparatus provided with a stirring mechanism is disclosed in Japanese Patent Application Laid-Open No. 60-110458. The ink tank main body described in Patent Document 1 is placed on a magnetic stirring device. In the magnetic stirring device, a rotating plate is rotated by a motor, and a magnetic field on the rotating plate is rotated to generate a rotating magnetic field. On the other hand, a container containing ink is placed on a stirring device with a rotating stirrer inserted, and the rotating stirrer is rotated by a rotating magnetic field generated from a motor-driven magnetic stirrer to stir the ink. The configuration is to let

JP-A-60-110458

  In the ink jet recording apparatus for pigment ink, it is preferable that the rotation speed of the stirrer is high in order to shorten the stirring time of the ink in the container. However, when the stirrer is driven at a high speed, the stirrer cannot follow and step out may occur, making it difficult to stir the ink stably.

  The object of the present invention is to provide a stirrer control that makes it possible to stably stir ink even when the stirrer that stirs the ink steps out, and that the stirrer can operate stably, and the stirrer operates normally. An object of the present invention is to provide an ink jet recording apparatus having a mechanism for determining whether or not the recording is performed.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. To give an example, an ink jet recording apparatus main body including an electric system control circuit, an ink circulation system control unit, a display panel, an ink container, and a stirring device; An ink jet recording apparatus comprising: a print head for printing on a print object; and a conduit connecting the print head and the ink jet recording apparatus main body. The stirrer for the ink container includes a magnetic stirrer in the ink container. And a stirrer and a motor are arranged below the ink container to control the rotational speed of the stirring bar.

  According to the present invention, even if the stirrer is out of step, it can be recovered quickly, so that stable ink agitation is possible, and a hole is arranged in the center of the stirrer and a rotation support bar is provided at the center of the bottom surface in the ink container. Since the structure is such that the stirrer rotates with the rotation support rod as an axis, step-out is less likely to occur. Moreover, the stirring efficiency was improved by the configuration in which the blades were arranged on the stirring bar. In addition, a vibration detector is placed in the ink container to determine the operation status of the stirrer, so troubles caused by pigment-based ink can be improved and good print quality can be maintained. Improved usability of the device.

1 is an external perspective view of an ink jet recording apparatus of the present invention. It is a perspective view which shows the use condition of an inkjet recording device. It is the schematic which shows the principle of operation of an inkjet recording device. FIG. 2 shows a cross-sectional view of the main body internal structure of the ink jet recording apparatus. The top view at the time of normal operation of the ink container of an inkjet recording device and a longitudinal cross-sectional view are shown. FIG. 5 shows a plan view and a longitudinal sectional view when the stirrer is out of step. It is the figure which showed the rotation speed of the stirrer of this invention, and the PWM wave to the motor for stirrers. The top view and longitudinal cross-sectional view of the structure which the stirring element in the ink container of this invention rotates centering on an axis | shaft are shown. The longitudinal cross-sectional view of the ink container which shows another Example of the axis | shaft which the stirring bar of this invention rotates is shown. The perspective view of the stirrer which arrange | positioned the blade | wing to the 2 pole stirrer of this invention, and a stirrer is shown. The perspective view of the stirrer which arrange | positioned the blade | wing to the 4-pole stirrer of this invention, and a stirrer is shown. The vibration detection system which equips the ink container of this invention with a vibration detector and detects the operation state of a stirrer is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to a following example.

Example 1
In Example 1 of the present invention, an ink jet recording apparatus will be described, and ink agitation will be described. FIG. 1 is an external perspective view of the ink jet recording apparatus of the present invention. In FIG. 1, 1 is an ink jet recording apparatus main body, 2 is a print head, 3 is an operation display unit, and 4 is a conduit. The ink jet recording apparatus includes an operation display unit 3 in an ink jet recording apparatus main body 1 and a print head 2 outside. The ink jet recording apparatus main body 1 and the print head 2 are connected by a conduit 4.

  Next, the use state of this ink jet recording apparatus will be described with reference to FIG. In FIG. 2, 1 is an ink jet recording apparatus main body, 2 is a print head, 4 is a conduit, 13 is a printing object on which numbers and characters are printed, 15 is a belt conveyor for conveying the printing object, and 16 is a belt conveyor 15. A rotary encoder 17 for measuring the conveying distance is a print sensor.

  For example, the ink jet recording apparatus is installed on a production line in a factory where food and beverages are produced, the main body 1 is installed at a position where the user can operate, and the print head 2 is moved on the production line such as the belt conveyor 15. It is installed at a position where it can approach the print target 13 to be fed. In order to print on the production line such as the belt conveyor 15 with the same width regardless of the feeding speed, the encoder 16 that outputs a signal corresponding to the feeding speed to the ink jet recording apparatus or the printing object 13 is detected. A print sensor 17 that outputs a signal for instructing printing to the ink jet recording apparatus is installed, and each is connected to a control unit (not shown) in the main body 1. In accordance with signals from the encoder 16 and the print sensor 17, the control unit controls the charge amount and charging timing of the ink particles 7 </ b> C ejected from the nozzle 8, and charges while the print target 13 passes near the print head 2. The deflected ink particles 7C are attached to the print object 13 for printing.

Next, the operation principle of the ink jet recording apparatus will be described with reference to FIG.
In FIG. 3, 18 is an ink container, 7A is ink, 24 is a pump that pressurizes and delivers ink, 9 is an electrostrictive element that vibrates at a predetermined frequency when a voltage is applied, 8 is a nozzle that ejects ink, and 7B is ink. It is a pillar. Reference numeral 11 denotes a charging electrode for charging ink particles, 7C denotes ink particles, 12 denotes a deflection electrode, 13 denotes an object to be printed, and 14 denotes a gutter for collecting ink particles not to be printed.

  The ink 7A in the ink container 18 is sucked and pressurized by the pump 24 to become an ink column 7B and is discharged from the nozzle 8. The nozzle 8 is provided with an electrostrictive element 9, and the ink column 7B ejected from the nozzle 8 is made into particles by applying vibration to the ink at a predetermined frequency. The number of ink particles 7C thus generated is determined by the frequency of the excitation voltage applied to the electrostrictive element 9, and is the same as the frequency. The ink particles 7 </ b> C can be charged by applying a voltage having a magnitude corresponding to the print information at the charging electrode 11.

  The ink particles 7 </ b> C charged by the charging electrode 11 fly in the electric field between the deflection electrodes 12. The deflection electric field is formed between a high voltage electrode to which a high voltage of 5 to 6 kV is applied and a ground electrode installed, and the charged ink particles 7C are deflected by receiving a force proportional to the charge amount. Then, it flies toward the printing object 13 and lands. At that time, the landing position of the ink particle 7C changes in the deflection direction according to the charge amount, and the production line 13 moves the print target 13 in the direction orthogonal to the deflection direction, so that the ink particle 7C also moves in the direction orthogonal to the deflection direction. Particles can be landed, and a character is composed of a plurality of landed particles for printing. The ink particles 7C that have not been used for printing fly linearly between the deflection electrodes 12 and are collected by the main ink container 18 via a path after being captured by the gutter 14.

Next, the configuration of the inkjet recording apparatus main body 1 will be described with reference to FIG.
FIG. 4 is a longitudinal sectional view of the ink jet recording apparatus. In the upper part of the ink jet recording apparatus main body 1, electric parts such as a control circuit 300 and a power source 310 for supplying current to the control circuit are arranged, and data is shown on the upper front surface. Is installed. Further, on the front side of the lower portion of the main body 1, a main ink container 18 that stores ink to be supplied to the nozzles and an auxiliary ink container (not shown) are fixed on a container base 622. Here, the auxiliary ink container has the same configuration as the main ink container and performs stirring of the ink, so that the description thereof is omitted. Under the container base 622, a stirrer 52A for agitating ink and a motor 54A for operating the stirrer 52A are installed.

  Further, a flow path board 621, a solenoid valve, a circulation control part such as a pump, and the like are housed in the rear side of the lower part of the main body 1. The back surface of the main body 1 is connected to the print head 2 via a conduit 4. Yes. The length of the conduit 4 is generally 4-6 m. In the conduit 4, a high-voltage power supply line and a control line for applying the electrodes into which the ink flows in and out and the electrodes are arranged.

  In addition, the main ink container 18 and the auxiliary ink container can be taken out from the main body 1 by opening the front door 600 at the bottom of the ink jet recording apparatus main body 1, and maintenance such as replenishment and disposal of ink and solvent is easy. It is configured to be able to.

Next, the structure of the ink container according to Example 1 will be described with reference to FIG.
Regarding the ink container used for the main ink container 18, FIG. 5 is an explanatory view of the ink container in Example 1, FIG. 5 (a) is a plan view of the ink container, and FIG. 5 (b) is a longitudinal sectional view. Yes. In FIG. 5, 61 is an ink container, 7A is pigment-based ink, 61A is an ink container bottom surface, 51 is a stir bar, 52 is a stirrer, 53 is a rotating member, 54 is a motor, and 622 is a container base.

  The ink container 61 has a circular bottom surface 61A. The stirrer 51 is provided above the bottom surface 61A, and the pigment-based ink 7A is accommodated inside the ink container 61. The ink container 61 is installed on the upper part of the container base 622, and the stirrer 52 is installed on the lower part of the container base 622. The pigment ink 7A in the ink container 61 is agitated by the stirrer 52. The stirrer 52 includes a rotating member 53 made of a magnetic material and a motor 54 that rotates the rotating member 53. The motor 54 and the rotating member 53 connected to the motor 54 are disposed inside the apparatus main body. The ink container 61 is provided on the stirring base 622 such that the stirring bar 51 is disposed on the rotating member 53. If the pigment-based ink 7A is left in the ink container 61 while being accommodated, the pigment component of the pigment-based ink 7A settles and accumulates on the bottom surface 61A near the center of the container.

  Next, the stirring operation in the ink container 61 will be described. The stirrer 52 according to the first embodiment includes a rotating member 53 made of a magnetic material. When the motor 54 is driven, the rotating member 53 rotates, and the magnetic material arranged on the rotating member rotates. A permanent magnet or the like is used as the magnetic material. In response to the magnetic field of the magnet, the stirrer 51 formed by the magnet also rotates in conjunction with it, causing convection in the ink and stirring the pigment-based ink 7A in the ink container.

  Next, a state in which the stirrer 51 does not operate in conjunction with the rotating member 53 disposed in the stirrer 52 in a normal operation of the stirrer 51 shown in FIG. 5 will be described with reference to FIG. 6A is a plan view of the ink container, and FIG. 6B is a longitudinal sectional view. The stirrer 51 is stepped out when the rotating member 53 of the stirrer 52 rotates at a high speed and the stirrer 51 cannot follow the high-speed rotation or when the rotation center 53C of the stirrer 52 and the rotation center 51C of the stirrer 51 start. It is likely to occur in a shifted state. Once the stirrer 51 is out of step, if the rotation center 53C of the stirrer 52 deviates from the rotation center 51C of the stirrer 51 as shown in FIG.

  Next, control of the stirrer 52 in which the stirrer 51 of the first embodiment is difficult to step out will be described with reference to FIG. FIG. 7 is a diagram showing an outline of the rotational speed control of the stirrer 52 showing an embodiment of the present invention. The time chart shown in FIG. 7 represents the rotational speed control of the stirrer 52 over time, and the horizontal axis represents time and the vertical axis represents the rotation speed. In the symbols shown in the figure, T0 represents a stirrer operation start time, T1 to T3 represent switching times from high speed rotation to low speed rotation, N0 represents stirrer stop, N1 represents low speed rotation, and N2 represents high speed rotation.

In the characteristic diagram of FIG. 7, the time intervals of the times T0 to T1, T1 to T2, T2 to T3,... Are equal to 5a (= a + b), that is, the motor rotation speed control is repeated in the cycle 5a. Here, time a is a time during which the low-speed rotation N1 operates, and time b (= 4a) is an operation time during the high-speed rotation N2.
In the characteristic diagram, at the stirrer operation start time T0, the stirrer 52 operates at the low speed rotation N1, and after the time a has elapsed, the operation is switched to the high speed rotation N2. Then, after the time b (= 4a) elapses, the speed is again switched to the low speed rotation N1, and this operation is repeated.

  The lower diagram of FIG. 7 shows motor control for realizing the stirrer speed control, where the horizontal axis represents time and the vertical axis represents voltage. The motor 54 is a motor that can control the rotation speed by a PWM signal, and can change the rotation speed according to the ON / OFF cycle of the voltage. In the low-speed rotation N1, the voltage ON interval is short, and the high-speed rotation N2 Then, the interval of voltage ON becomes long.

  By performing such control, even when the stirrer 51 rotating during the operation of the stirrer 52 (high-speed rotation N2) is detached from the rotating member 53 as shown in FIG. The rotation is restored at the time of N1, and a normal stirring operation of the ink 7A (the state shown in FIG. 5) becomes possible. Further, the stirring bar 51 rotates slowly at the start of rotation and rotates at a lower speed than the average rotation speed.

  As described above, according to the present invention, in the ink jet recording apparatus, even when the rotating member 53 of the stirrer 52 and the stirrer 51 do not operate in conjunction with each other, that is, when the stepping out occurs, it can be recovered early. Therefore, stable ink agitation is possible, and accumulation on the bottom surface 61A of the container can be eliminated without causing the pigment component of the pigment-based ink 7A to remain. As a result, troubles associated with printing such as clogging in the piping path and nozzles and color unevenness that occurs during printing can be improved, and good printing quality can be maintained, enabling more stable operation. An ink jet recording apparatus can be provided.

(Example 2)
Next, the structure for preventing the step-out of the stirrer according to the second embodiment of the present invention will be described with reference to FIG. 8A is a plan view of the ink container, FIG. 8B is a longitudinal sectional view of the ink container, and the configuration is the same as in FIG. The second embodiment has a configuration in which a hole is arranged at the center of rotation of the stirrer 51A, and a rotation support rod 70 that is a rotation shaft is passed through the hole to rotate the stirrer 51A.
The rotation support rod 70 is disposed on the bottom surface 61 </ b> A of the ink container 61 and is disposed and fixed at a position that coincides with the rotation center of the rotation member 53 of the stirrer 52.

  The height of the rotation support bar 70 is a length that does not come out of the rotation support bar 70 when the stirrer 51A follows the high speed rotation of the rotation member 53 of the stirrer 52, rotates at a high speed and moves away from the bottom surface 61A of the ink container. To. Further, the inner diameter of the hole of the stirrer 51A and the diameter of the rotation support rod 70 are made to loosen the gap and rotate smoothly. With such a configuration, even if the stirrer 51A cannot follow the high speed rotation of the rotating member 53 in the stirrer 52, the center of rotation does not deviate, and the stirrer 51A can follow the stirrer 52 when it rotates at a low speed. The pigment ink can be stirred.

  Further, as the stirrer 51A and the rotating member 53 of the stirrer 52, a strong magnetic neodymium magnet (neodymium magnet) or an anisotropic ferrite magnet is used and a combination thereof is used.

(Example 3)
Next, the structure of the stirring bar of Example 3 of this invention is demonstrated using FIG.
FIG. 9 shows a vertical cross-sectional view of the ink container 61, and a description of portions common to FIG. 5 is omitted. In the third embodiment, as shown in FIG. 9, the stir bar 51 </ b> A is arranged at a position floating above the bottom surface 61 </ b> A of the ink container 61. The rotation support bar 70A that supports the stirrer 51A has a diameter larger than the inner diameter of the hole of the stirrer 51A so that the stirrer 51A does not drop at a predetermined height.

The upper side of the rotation support bar 70A is formed so that the diameter of the rotation support bar is smaller than the inner diameter of the hole of the stirring bar 51A so that the stirring bar 51A can rotate smoothly.
In FIG. 9, the position of the stirring bar is made higher for the sake of explanation, but the height is set in a range in which the stirring bar can follow the rotation of the rotating member 53 in the stirrer 52. As described above, the configuration in which the stirrer 51A is made higher than the bottom surface 61A of the ink container 61 allows the pigment component of the pigment-based ink 7A to settle and deposit on the central portion of the bottom surface 61A of the ink container when the ink jet recording apparatus is not used. This prevents the stirring bar 51A from rotating.

Example 4
Next, a fourth embodiment of the present invention will be described with reference to FIG. 10A shows a perspective view of a configuration in which blades 80 are arranged on a bar-shaped stirring bar 51A, and FIG. 10B shows a perspective view of a stirrer 52C corresponding to the stirring bar 51A. FIG. 10A shows a perspective view in which a flat blade is formed in the longitudinal direction at a target position around the rotation shaft hole 81 on the rod-shaped stirrer 51A. Although FIG. 10A is a flat blade as a blade, it may be a circular blade. The blade material may be a metal or a resin such as plastic.

  FIG. 10B is a perspective view of the stirrer 52 </ b> C, and circular permanent magnets 53 </ b> A are arranged symmetrically with respect to the central axis (rotating axis) 55 in the stirrer 52 </ b> C. With such a configuration, when the stirrer 52C rotates, the stirrer 51A follows and rotates, and the vane 80 makes it easy for the pigment ink 7A to vortex, thereby promoting stirring.

(Example 5)
Next, a fifth embodiment of the present invention will be described with reference to FIG. In FIG. 11, FIG. 11 (a) is a cross-shaped stirrer 51B with blades 82 arranged, and FIG. 11 (b) is a perspective view of a stirrer 52D corresponding to the perspective view of the stirrer 52 corresponding to the stirrer 51B. Show. In the cross-shaped stirring bar 51B, if the counter electrodes are the same pole, for example, if it is the S pole, the counter electrode is also the S pole, and the adjacent pole is the N pole. Further, the cross-shaped stirrer 51B is formed with a blade 82, a rotation shaft hole 83 is disposed at the center, and is inserted into a rotation support rod of the rotation shaft.

  The blades 82 are liable to cause vortices in the pigment-based ink by rotation, and have the effect of improving the stirring efficiency. Further, four circular permanent magnets 53B are arranged at intervals of 90 degrees on the stirrer 52D shown in FIG. The magnets 53B are arranged in the same arrangement as the magnetic poles of the stir bar 51B, with the counter electrodes being the same magnetic poles. 11, when the stirrer 52D rotates about the shaft 55, the stirrer 51B in the ink container rotates following the magnetic force, and the pigment-based ink 7A is stirred by the blades 82. Moreover, since the number of blades is four, the stirring efficiency is improved.

(Example 6)
Next, a detection system for detecting the operation state of the stirring bar 51 according to the sixth embodiment of the present invention will be described with reference to FIG. FIG. 12 shows a detection system that detects the operating state of the stirrer 51 that stirs the pigment-based ink 7A in the ink container 61, that is, whether the stirrer 51 is rotating normally, out of step, or stopped. In FIG. 12, 100 is an MPU that controls the entire inkjet recording apparatus, 101 is a rewritable RAM that temporarily stores data such as a vibration detector, and 102 is a necessary program, for example, a control program that controls rotation of a stirrer motor. ROM for storing data and data in advance, 103 is a panel interface, and 104 is a display panel (3) for inputting data. A motor control circuit 105 controls the stirrer motor. A vibration detection circuit 106 is a circuit for inputting a vibration detector signal.

  In addition, the MPU 100 is connected to a printed material detection circuit, a character signal generation circuit, and the like, which are omitted. In FIG. 12, the vibration detector 110 is disposed on the outer wall of the ink container 61 in order to detect the operation state of the stirring bar 51 in the ink container 61. As the vibration detector 110, an acceleration sensor or the like is used. When a drive signal is transmitted from the motor control circuit 105 to the stirrer driving motor 54 and the motor 54 rotates, the stirrer 52 rotates. When the stirrer 52 rotates, the stirrer 51 follows and rotates by the magnetic force of the permanent magnet disposed on the stirrer, and the ink 7A causes convection and is stirred.

  Next, the operation of the stirring bar and the signal of the vibration detector 110 will be described. First, when the stirrer 52 rotates and the stirrer 51 normally rotates at a rotational speed of 500 to 600 rpm, the vibration detector 110 receives a certain level of acceleration signal of the stirrer. Since the stirrer 51 rotates with or without contacting the bottom surface of the ink container, the acceleration signal has a certain width but a certain level of signal with a certain width.

  Next, a case where step-out occurs from the state where the stirring bar 51 is rotating normally will be described. Since the stirrer 51 is formed of a heavy metal (magnet) having a circular cross section and a bar shape, when the step-out occurs, the stirrer 51 rolls on the bottom surface or hits the inner wall of the ink container and performs various abnormal movements. Therefore, when the stirring bar 51 hits the inner wall of the container, a protruding acceleration signal appears in the vibration detector 110. The protruding signal is characterized in that the time is very short and the vibration level is extremely high. Further, since the acceleration signal when the stirrer 51 rolls on the bottom surface rolls by hitting the bottom surface, a protruding signal frequently appears on the time axis, and the vibration level increases irregularly. It is getting lower. The level of the acceleration signal when the step-out occurs is smaller than that of normal rotation and irregular.

  Next, the case where the stirring bar 51 does not rotate even when the motor 54 is driven and the stirrer 52 is rotated will be described. When the stirrer 51 does not rotate, when the rotation center axis of the magnetic stirrer 51 is deviated from the rotation axis of the stirrer 52, or when the ink jet recording apparatus has not been operated for a while, the pigment on the bottom surface of the ink container 61 There is a case in which a part of the mixture settles and adheres, and the stirring bar 51 is buried and cannot rotate.

  In such a state that the stirring bar 51 is stopped, the acceleration signal of the vibration detector 110 has a signal level almost close to zero. Therefore, it can be determined that the stirrer 51 is stopped when the signal of the vibration detector 110 is close to zero level by looking at the transmission of the rotation drive signal of the motor.

  With the above configuration, the operation state of the stirrer 51 can be determined. Therefore, when the stirrer is out of step or cannot rotate, it is possible to notify surrounding managers by a warning light or an alarm 107 shown in FIG. .

1. Inkjet recording device body,
2. Print head,
3, 104 ... display panel,
4 ... conduit,
7A: Pigment ink
7B ... ink column,
7C ... ink particles,
8 ... Nozzle,
9. Electrostrictive element,
11 ... charging electrode,
12. Deflection electrode,
13.
14 Gutter,
15 ... belt conveyor,
16. Rotary encoder,
17. Print sensor,
18, 61 ... ink container,
24 ... pump,
51 .. Stir bar,
52, 52A Stirrer,
53 ... Rotating member,
54, 54A Motor,
61A ... bottom of ink container,
100 ... MPU,
101 ... RAM,
102 ... ROM,
103 ... Panel interface
105 ... motor control circuit,
106 ... vibration detection circuit,
110: Vibration detector,
300 ... control circuit,
310 ... power supply,
600 ... door,
622 ... Container base

Claims (8)

An ink jet recording apparatus main body including an electric system control circuit, an ink circulation system control unit, a display panel, an ink container, and a stirring device;
A print head for printing on a print object;
In an ink jet recording apparatus comprising a conduit connecting the print head and the ink jet recording apparatus main body,
The stirrer for the ink container has a magnetic stirrer disposed in the ink container,
A stirrer provided with a motor and a magnetic rotating member driven by the motor is disposed below the ink container, and the stirrer is controlled via the magnetic rotating member by controlling the rotation of the motor of the stirrer. Is controlled so that the rotation speed is alternately switched between low-speed rotation and high-speed rotation periodically,
2. An ink jet recording apparatus according to claim 1, wherein an operation time at the low speed rotation is less than half of an operation time at the high speed rotation . The inkjet recording apparatus according to claim 1, wherein
The ink jet recording apparatus according to claim 1, wherein the rotation speed of the stirring bar is lower than the average rotation speed at the start of rotation . The inkjet recording apparatus according to claim 1 , wherein
An ink jet recording apparatus characterized in that a rotation support bar is formed vertically in the center of the bottom surface in the ink container, a hole is formed in the center of the stirrer, and the rotation support bar is inserted and rotated. . The inkjet recording apparatus according to claim 3 .
The lower side of the rotating support rod through which the magnetic stirrer is inserted is made larger than the inner diameter of the hole arranged in the stirrer, and the stirrer is installed at a predetermined height position. Inkjet recording device. The inkjet recording apparatus according to claim 1, wherein
An ink jet recording apparatus, wherein blades are formed on the stirrer . The inkjet recording apparatus according to claim 5.
An ink jet recording apparatus, wherein the magnetic stirrer has a rod shape or a cross shape . The inkjet recording apparatus according to claim 1, wherein
An ink jet recording apparatus , wherein a vibration detector is installed on an outer wall of the ink container, and the operation state of the stirrer is detected by the vibration detector . The inkjet recording apparatus according to claim 7, wherein
The ink jet recording apparatus according to claim 1, wherein the operation state of the stirrer is a normal rotation state, a step-out state, or an inoperable state .

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