JP4624893B2 - Ink jet printer and hot water generator for the printer - Google Patents

Description

  The present invention relates to an ink jet printer having an ink path including a flexible tube for supplying ink liquid from an ink tank to an ink jet head, and a hot water generating device used in the printer.

  As shown in FIG. 9, an ink jet printer that prints a large screen such as an outdoor advertisement or a poster is equipped with the medium 10 in accordance with the width of the medium (recording medium) 10 such as a resin sheet for the large screen printing. The horizontal width of the platen 20 (the width in the Y direction) is also as long as 1 meter to several meters. Accordingly, the inkjet head 30 that travels in the Y direction (lateral direction corresponding to the width direction) above the medium 10 mounted on the platen 20 also reciprocates left and right over a long distance of 1 meter to several meters. In addition, in an inkjet printer for large-screen printing, it is necessary to continue supplying a large amount of ink liquid to the inkjet head 30. Therefore, in such a large-sized ink jet printer, an ink tank 50 in which a large amount of ink liquid 40 is stored is provided on the side of the printer body. The ink liquid in the tank 50 is supplied to the inkjet head 30 through the long ink path 60. The ink path 60 is formed by using a flexible flexible tube or the like, and the ink path 60 is prevented from obstructing smooth running in the Y direction of the ink jet printer.

In such a large-scale inkjet printer, an ink chamber (see FIG. 5) that temporarily stores the ink liquid that has passed through the ink path 60 is provided at the rear end of the ink path 60 that supplies the ink liquid 40 in the ink tank 50 to the inkjet head 30. (Not shown) is provided. The damper 70 has a structure that absorbs a change in dynamic pressure generated in the ink liquid 40 that has passed through the ink path 60. In addition, the ink liquid 40 from which the change in dynamic pressure has been removed is configured to be stably supplied to the inkjet head 30. The damper 70 is attached to the inkjet head 30 and has a structure that reciprocates in the Y direction integrally with the inkjet head 30.
Thus, the reason why the dynamic pressure changes in the ink liquid 40 that passes through the ink path 60 is that, in a large-sized ink jet printer, the ink jet head 30 is set to a distance as long as 1 meter to several meters as described above. This is because it is reciprocated at high speed repeatedly in the direction. In this case, the ink liquid 40 is transferred to the ink liquid 40 transferred through the ink path 60 formed of a flexible tube or the like that connects the ink jet head 30 that reciprocates at a high speed in the Y direction with the ink tank 50. This is because a large inertia force in the direction of the direction works repeatedly. This is because the dynamic pressure of the ink liquid 40 passing through the ink path 60 varies greatly. For this reason, if the ink liquid 40 that has passed through the ink path 60 where the dynamic pressure changes greatly is continuously supplied to the inkjet head 30, the ink liquid 40 is obstructed by the change in the dynamic pressure of the ink liquid 40 and the ink liquid 40. This is because it is not possible to continue to supply the ink jet head 30 stably to the inkjet head 30 in a fixed amount. As a result, ink droplets cannot be stably and smoothly ejected from the ink discharge port (not shown) of the inkjet head 30 by a certain amount.

By the way, recently, solvent inks and so-called UV curable UV inks are often used as ink liquids for large-sized ink jet printers. The reason is that solvent ink can directly and clearly fix and print images on various types of media such as leather, metal plates, and cloth without forming an undercoat layer or other undercoat layer. is there. Also, UV ink is excellent in water resistance and weather resistance, and is optimal for printing images on media for outdoor advertisements and posters.
JP 2004-358769 A

  However, the above-mentioned solvent ink and UV ink have high viscosity at room temperature, and when these solvent ink and UV ink are ejected from a small-diameter ink discharge port aligned with the inkjet head in the room temperature state, the viscosity is high. Ink droplets of high diameter cannot be ejected from the ink discharge port in a certain amount stably and surely and smoothly because the ink discharge port is clogged. As a result, the amount of ink droplets ejected from the ink discharge ports arranged in the head becomes insufficient, and the dot diameter of the ink formed on the medium by the ink droplets becomes smaller than a desired value. And the quality of the image printed on the medium will fall.

Therefore, as a result of intensive research, the present inventors have found that in order to eliminate the problems of printers using inks such as solvent inks and UV inks with high viscosity at room temperature, ink from the ink tank to the ink jet head is used. It has been conceived that the ink liquid temporarily stored in the ink chamber of the damper provided at the rear end of the ink path for supplying the liquid may be heated by the heating means. That is, by doing so, after the ink liquid temporarily stored in the ink chamber of the damper is heated to reduce its viscosity, the ink liquid having the reduced viscosity can be supplied to the inkjet head. I thought. Then, the inventors have conceived that the ink droplets whose viscosity has been lowered by heating can be stably and surely ejected from the small-diameter ink discharge ports arranged in the head in a certain amount.
Then, we developed an ink jet printer that uses such ideas and uses inks such as solvent ink and UV ink, which have high viscosity at room temperature.

  That is, the present invention stably and smoothly ejects ink droplets such as solvent ink and UV ink having high viscosity in a low temperature state such as a room temperature state from a small diameter ink discharge port arranged in an inkjet head in a certain amount. An object of the present invention is to provide an ink jet printer (hereinafter referred to as a printer) using an ink having a high viscosity in a low temperature state.

In order to achieve such an object, the printer of the present invention temporarily stores the ink liquid that has passed through the ink path in the ink chamber at the rear end of the ink path that supplies the ink liquid from the ink tank to the inkjet head. In the printer provided with a damper for absorbing the dynamic pressure change generated in the ink liquid that has passed through the ink path by the ink liquid temporarily stored in the ink chamber,
Heating means for heating the ink liquid temporarily stored in the ink chamber and reducing the viscosity of the ink liquid is provided, and the heating means stores the ink liquid temporarily stored in the ink chamber. it is characterized by through the ink chamber and the partition wall is intended to heat the hot water circulating warm water chamber that is attached only on one side of the ink chamber.

In the printer having such a configuration, the ink liquid such as solvent ink or UV ink that passes through the ink path and is temporarily stored in the ink chamber is heated, and the hot water having a large heat capacity is circulated in the hot water chamber. The ink liquid temporarily stored in the ink chamber adjacent to the hot water chamber via the partition can be stably heated to a constant temperature. Then, the ink liquid in the ink chamber which has been heated to be stabilized at the constant temperature and whose viscosity has decreased can be supplied to the inkjet head.

In the printer according to the aspect of the invention, the heating unit may be disposed in the flow path of the ink liquid flowing from the ink path disposed around the ink chamber in addition to the ink liquid temporarily stored in the ink chamber. The ink liquid passing therethrough may be heated by hot water circulating in a hot water chamber provided adjacent to the ink passage through the flow path, the damper mechanism, and the partition wall.
In such a case, in addition to the ink liquid temporarily stored in the ink chamber adjacent to the hot water chamber via the partition wall, it passes through the flow path of the ink liquid flowing in from the ink path disposed around the ink chamber. The ink liquid to be heated can be stably heated to a constant temperature by the hot water having a large heat capacity circulating in the adjacent hot water through the ink chamber, the flow path, the damper mechanism part, and the partition wall. Then, the ink liquid that has passed through the ink liquid flow passage and the ink chamber in order and that has been stably heated to a constant temperature and reliably reduced in viscosity can be supplied to the inkjet head.

In the printer of the present invention, the heating means passes through the circulation path of the ink liquid flowing from the ink path disposed in the hot water chamber in addition to the ink liquid temporarily stored in the ink chamber. It is preferable that the ink liquid to be heated is heated by hot water circulated in a hot water chamber that is in contact with the side wall of the circulation path.
In such a case, in addition to the ink liquid temporarily stored in the ink chamber adjacent to the hot water chamber via the partition wall, the ink liquid passing through the circulation path of the ink liquid disposed in the hot water chamber is also provided. Heat can be stably heated to a constant temperature by hot water having a large heat capacity that circulates in the hot water that is adjacent to or in contact with the circulation path of these ink chambers and ink liquid via the partition walls and side walls . Then, the ink liquid that has passed through the circulation path of the ink liquid and the ink chamber in order and is stably heated to a constant temperature and reliably reduced in viscosity can be supplied to the inkjet head.

In the printer of the present invention, the hot water generating device for generating hot water circulating in the hot water chamber includes a water tank for storing hot water generating water, and the water tank standing at a predetermined interval and standing in a vertical direction that is a gravity direction. A plurality of partition plates arranged side by side, and the plurality of partition plates are positioned such that the lower ends of the adjacent partition plates are positioned above the vertical direction from the inner bottom surface of the water tank. For hot water generation, the upper part of the other partition plate adjacent to the partition plate is alternately shifted up and down in the water tank so that the upper end of the other partition plate is positioned below the upper end opening edge of the water tank in the vertical direction. The water is allowed to pass from one side of the water tank to the other side in the horizontal direction orthogonal to the vertical direction while moving up and down in the vertical direction. At the same time, a plate that heats the water for hot water generation that passes from one side of the water tank to the other side in the horizontal direction perpendicular to the vertical direction while moving up and down in the vertical direction so as to be sandwiched from both the upper and lower sides in the vertical direction. It is preferable to have a heater.
In the hot water generating apparatus having such a configuration, the water for generating hot water in the water tank is passed from one side in the water tank to the other side by a plurality of partition plates arranged side by side in the water tank. be able to. And by using a plate heater arranged so as to sandwich hot water to be passed from one side to the other side in the water tank, it is uniformly and efficiently heated to a constant temperature. Can do.

In this hot water generator, it is preferable that the peripheral wall of the water tank is covered with a heat insulating material.
  In such a case, the water in the water tank heated to a constant temperature by the plate heater can be prevented from being dissipated to the outside air through the peripheral wall of the water tank. And it can prevent that the temperature of the water for the warm water production | generation in the water tank falls without being maintained stably at fixed temperature.

As described above, according to the printer of the present invention, the ink liquid temporarily stored in the ink chamber of the damper, the ink liquid passing through the ink liquid flow path, and the ink liquid circulation path, With hot water having a large heat capacity that circulates in the room, it can be stably heated to a constant temperature. Then, the ink liquid that is stably heated to the constant temperature and has a reduced viscosity can be supplied to the inkjet head. Then, it is possible to stably and surely and smoothly eject ink droplets that have been heated to the constant temperature and whose viscosity has decreased from the small-diameter ink discharge ports arranged in the inkjet head in a certain amount.
According to the hot water generating apparatus for a printer of the present invention, the hot water generating water circulating in the water tank can be heated to a constant temperature by using a plate heater, and can be uniformly and reliably heated quickly. And the water heated stably and reliably at the fixed temperature, that is, warm water can be supplied into the warm water chamber.

  1 to 3 show a preferred embodiment of the printer of the present invention, FIG. 1 is a sectional view of the ink chamber, FIG. 2 is a sectional view of the hot water chamber, and FIG. 3 is an ink chamber and hot water lined up next to each other. It is side surface sectional drawing of a chamber. The printer will be described below.

  As in the printer shown in FIG. 9, this printer supplies the ink liquid 40 in the ink tank 50 to the inkjet head 30 through an ink path 60 composed of a flexible flexible long flexible tube. I am doing. A damper 70 having an ink chamber 80 for temporarily storing the ink liquid 40 is provided at the rear end of the ink path 60. The damper 70 is attached to the inkjet head 30 and has a structure that moves in the Y direction integrally with the inkjet head 30. When the ink-jet head 30 is reciprocated in the Y direction, inertial force (dynamic pressure) applied to the ink liquid 40 that passes through the ink path 60 formed of the flexible tube connecting the head 30 and the ink tank 50. ) Is absorbed by the damper 70 having the ink chamber 80 in a state where the ink liquid that has passed through the ink path 60 is temporarily stored in the ink chamber 80 of the damper. The ink chamber outlet 84 is connected to an ink liquid inlet (not shown) of the inkjet head 30.

The above configuration is the same as that of the conventional printer described above. In this printer, the ink liquid 40 temporarily stored in the ink chamber 80 of the damper is heated to reduce the viscosity of the ink liquid 40. A heating means 90 is provided.
The ink liquid 40 such as solvent ink or UV ink having a high viscosity is heated by the heating means 90 in the room temperature state temporarily stored in the ink chamber 80, and the viscosity of the ink liquid 40 is reduced. is doing. The ink liquid 40 having a reduced viscosity due to heating is supplied to the inkjet head 30.

As shown in FIGS. 2 and 3, the heating means 90 is a hot water provided by adjoining the ink liquid 40 temporarily stored in the ink chamber 80 of the damper via the ink chamber 80 and the partition wall 72. Heating is performed by hot water 110 circulating in the chamber 100. The hot water chamber 100 has a structure in which the hot water 110 introduced from the hot water introduction port 102 circulates in the hot water chamber 100 from the lower side to the upper side and is then discharged from the hot water discharge port 104 to the outside of the hot water chamber 100. ing. The hot water chamber 100 is integrally attached to the damper 70 next to the ink chamber 80.
The ink liquid 40 temporarily stored in the ink chamber 80 adjacent to the hot water chamber 100 through the partition wall 72 is heated to a constant temperature by the hot water 110 having a large heat capacity circulating in the hot water chamber 100. It has a structure that can be continued. In addition, the ink liquid 40 in the ink chamber 80 that has been heated to the constant temperature and has a reduced viscosity is supplied to the inkjet head 30. The damper mechanism 74 is formed of a material having poor thermal conductivity that is difficult to transmit heat in order to prevent heat from being dissipated wastefully from the hot water 110 in the hot water chamber into the outside air. The damper mechanism 74 is made of a lightweight material in order to prevent the weight of the inkjet head 30 to which the damper mechanism 74 is attached from increasing. On the other hand, the partition wall 72 is formed of a material having good thermal conductivity so that the ink liquid 40 in the ink chamber is efficiently heated by the hot water 110 in the hot water chamber.

  FIG. 4 shows another preferred embodiment of the printer of the present invention, and FIG. The printer will be described below.

In this printer, the heating means 90 is supplied from the ink path 60 disposed in the damper mechanism portion 74 around the ink chamber 80 of the damper in addition to the ink liquid 40 temporarily stored in the ink chamber 80 of the damper. The ink liquid 40 that passes through the flow path 62 of the inflowing ink liquid is circulated by the hot water 110 that circulates in the hot water chamber 100 provided adjacent to the ink liquid flow path 62 through the damper mechanism 74 and the partition wall 72. It has a heated structure. The flow path 62 for the ink liquid is long and integrally disposed in an inverted U-shape or the like in the damper mechanism portion 74 around the ink chamber 80. The contact area between the ink liquid flow path 62 and the surrounding damper mechanism 74 is increased. The ink liquid 40 passing through the ink liquid flow path 62 is efficiently heated by the hot water 110 circulating in the adjacent hot water chamber 100 via the damper mechanism 74 and the partition wall 72. . The inlet of the ink liquid flow path 62 is connected to the rear end of the ink path 60. The outlet of the ink liquid flow passage 62 is connected to the ink liquid inlet of the ink chamber 80.
Then, in addition to the ink liquid 40 temporarily stored in the adjacent ink chamber 80 via the hot water chamber 100, the damper mechanism portion 74 and the partition wall 72, the damper mechanism portion 74 around the ink chamber 80 is long. The ink liquid 40 that passes through the ink liquid flow path 62 that flows in from the provided ink path 60 passes through the ink chamber 80, the ink liquid flow path 62, the damper mechanism portion 74, and the partition wall 72 and is adjacent to the hot water. It is structured to be surely heated by a large amount of hot water 110 having a large heat capacity circulating in the chamber 100. Then, the ink liquid 40 having the viscosity reduced by passing through the ink liquid flow passage 62 and the ink chamber 80 in order and reliably heated to a certain temperature is supplied to the inkjet head 30. Yes.
The other parts of the printer shown in FIG. 4 are configured in the same manner as the printer shown in FIGS.

  FIG. 5 shows another preferred embodiment of the printer of the present invention, and FIG. The printer will be described below.

In this printer, the heating means 90 has a circulation path for the ink liquid flowing in from the ink path 60 provided in the hot water chamber 100 in addition to the ink liquid 40 temporarily stored in the ink chamber 80 of the damper. The ink liquid 40 that passes through the inside 64 is heated by the hot water 110 that circulates in the hot water chamber 100 that contacts the side wall 66 of the circulation path of the ink liquid. The side wall 66 of the ink liquid circulation path is formed using a metal member such as stainless steel having good thermal conductivity, and the ink passing through the ink liquid circulation path 64 through the side wall 66 of the ink liquid circulation path. The liquid 40 is structured to be efficiently heated to a constant temperature by the hot water 110 circulating in the hot water chamber 100. The inlet 65 of the ink liquid circulation path is connected to the rear end of the ink path 60 formed of a flexible tube. The outlet 67 of the ink liquid circulation path is connected to the ink liquid inlet of the ink chamber 80.
Then, in addition to the ink liquid 40 temporarily stored in the ink chamber 80 adjacent to the hot water chamber 100 via the partition wall 72, the ink liquid flowing in from the ink path 60 disposed in the hot water chamber 100 is used. The ink liquid 40 passing through the circulation path 64 is surely ensured by the hot water 110 circulating in the hot water chamber 100 adjacent to or in contact with the ink chamber 80 or the ink liquid circulation path 64 via the partition wall 72 or the side wall 66. It has a heated structure. Then, the ink liquid 40 that passes through the ink liquid circulation path 64 and the ink chamber 80 in order and is reliably heated to a constant temperature and has a reduced viscosity is supplied to the inkjet head 30.
The other parts of the printer shown in FIG. 5 are configured in the same manner as the printer shown in FIGS.

  6 to 8 show a preferred embodiment of the hot water generator used in the printer of the present invention, FIG. 6 is a plan sectional view showing the schematic structure, FIG. 7 is a front sectional view, and FIG. 8 is a side view thereof. It is sectional drawing. Below, this warm water production | generation apparatus is demonstrated.

The hot water generator for generating hot water 110 that circulates in the hot water chamber 100 includes a box-shaped water tank 200 made of plastic or the like having a wide open upper end having a lid 203 for storing hot water generating water 112.
In the water tank 200, a plurality (three in the figure) of partition plates 210 are arranged side by side with standing up and down at regular intervals. As shown in FIG. 7, the plurality of partition plates 210 are positioned such that the lower ends of the adjacent partition plates (partition plates at both ends in the figure) 210 are located above the inner bottom surface of the water tank 200. The other partition plate (partition plate at the center in the figure) 210 adjacent to the partition plate is alternately shifted up and down in the water tank 200 so that the upper end is located below the upper end opening edge of the water tank 200. Yes. Then, as indicated by arrows in FIG. 7, the water 112 for generating hot water is transferred from one side in the water tank 200 to the other side in the water tank 200 in which the plurality of partition plates 210 are arranged side by side. It has a structure that passes while circulating up and down.
Also, in the water tank 200, two plate heaters 220 on the left and right sides sandwich water 112 for generating hot water that passes while circulating vertically from one side of the water tank 200 to the other side. It is arranged like this. The two plate heaters 220 efficiently heat the water 112 for generating hot water circulating up and down in the water tank 200. For the plate heater 220, a sheathed heater or the like is used.
And the water 112 for the warm water generation | occurrence | production which passes circulating up and down from one side in the water tank 200 in which the several partition plate 210 was arrange | positioned side by side is arrange | positioned so that it may pinch | interpose from the both sides The plate heater 220 has a structure in which it is uniformly and stably heated to a constant temperature.
As shown in FIG. 6, the water 112 for generating hot water is supplied into the water tank 200 through the water supply port 202, circulates in the water tank 200, becomes hot water 110, and then enters the water tank 200. , Through the discharge port 204, it is sent into the hot water chamber 100 attached to the damper 70. The hot water 110 fed into the hot water chamber 100 circulates in the hot water chamber 100 and is then returned to the water tank 200 again. The hot water 110 is reused as water 112 for generating hot water. Has a structure. The water 112 for generating hot water has a structure in which it is forcedly circulated through the water tank 200 and the hot water chamber 100 using the liquid pumping pump 206. A temperature sensor 208 that measures the temperature of the water 112 circulating in the water tank 200 is provided at the upper center of the water tank 200. A water tank 200 which is a main body of the hot water generating device is used by being placed on a side portion of the printer main body.

Furthermore, in the hot water generator shown in FIGS. 6 to 8, the peripheral wall of the water tank 200 is continuously covered with a thick heat insulating material 207.
And it has the structure where the water 112 in the water tank heated to the fixed temperature by the plate heater 220 is prevented from being dissipated wastefully into the outside air through the peripheral wall of the water tank 200. And it has the structure where the temperature of the water 112 in the water tank is stably maintained at a fixed temperature.

  The hot water generator shown in FIGS. 6 to 8 is configured as described above. According to this hot water generator, a general-purpose 1 Kw heater that is thrown into the water tank 200 is charged, When the same amount of water 112 in the water tank 200 of the same capacity is heated to the same temperature by using two plate-like sheathed heaters 220 having a total of 417 w as compared with the case where the water in the water tank 200 is heated. It has been confirmed by experiments that the maximum power consumption can be reduced by about 58%.

  In this printer, the heating means 90 for heating the ink liquid 40 temporarily stored in the ink chamber 80 blows hot air to the damper mechanism 74 around the ink chamber 80, and the hot air blows the ink in the ink chamber 80. It is also possible to heat the liquid 40 or embed an electric heater in the damper mechanism 74 around the ink chamber 80 and heat the ink liquid 40 in the ink chamber 80 by the heater. Furthermore, the ink liquid 40 in the ink chamber 80 may be directly heated by an electric heater charged in the ink liquid 40 temporarily stored in the ink chamber 80.

The printer of the present invention is a large-sized printer that reciprocates the inkjet head over a long distance in the Y direction above the platen, and is widely applicable to printers that supply ink in an ink tank to the inkjet head through a long ink path. .
In addition, the printer uses a large amount of ink and continuously supplies a large amount of ink in an ink tank to an ink jet head through an ink path. It is also widely available for printers.

It is front sectional drawing of the ink chamber of the damper of the printer of this invention. It is front sectional drawing of the hot water chamber of the damper of the printer of this invention. FIG. 4 is a side sectional view of the vicinity of an ink chamber and a hot water chamber arranged next to each other in the printer damper of the present invention. FIG. 3 is a front cross-sectional view around the ink chamber of the damper of the printer of the present invention. It is front sectional drawing of the warm water chamber periphery of the damper of the printer of this invention. It is a plane sectional view showing a schematic structure of a warm water generating device used for a printer of the present invention. It is front sectional drawing of the hot water production | generation apparatus used for the printer of this invention. It is side surface sectional drawing of the hot water production | generation apparatus used for the printer of this invention. It is a schematic structure explanatory drawing of an inkjet printer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Media 20 Platen 30 Inkjet head 40 Ink liquid 50 Ink tank 60 Ink path 62 Ink liquid flow path 64 Ink liquid circulation path 70 Damper 72 Partition 74 Damper mechanism 80 Ink chamber 90 Heating means 100 Hot water chamber 110 Hot water 112 Hot water generation Water 200 Water tank 207 Heat insulating material 210 Partition plate 220 Plate heater

Claims (5)

At the rear end of the ink path for supplying the ink liquid from the ink tank to the ink jet head, the ink liquid that has passed through the ink path is temporarily stored in the ink chamber, and the ink is temporarily stored in the ink chamber by the ink liquid temporarily stored in the ink chamber. In an inkjet printer equipped with a damper that absorbs a change in dynamic pressure generated in the ink liquid that has passed through the path,
Heating means for heating the ink liquid temporarily stored in the ink chamber and reducing the viscosity of the ink liquid is provided, and the heating means stores the ink liquid temporarily stored in the ink chamber. An ink jet printer , characterized by being heated by hot water circulating through a hot water chamber provided only on one side of the ink chamber via the ink chamber and a partition wall . In addition to the ink liquid temporarily stored in the ink chamber, the heating means supplies the ink liquid passing through the flow path of the ink liquid flowing from the ink path disposed around the ink chamber. 2. The ink jet printer according to claim 1, wherein the ink jet printer is heated by hot water circulating in a hot water chamber provided adjacent to each other through a flow passage, a damper mechanism, and a partition wall.   In addition to the ink liquid temporarily stored in the ink chamber, the heating means circulates the ink liquid passing through the circulation path of the ink liquid flowing from the ink path disposed in the hot water chamber. 2. An ink jet printer according to claim 1, wherein the ink jet printer is heated by hot water circulating in a hot water chamber in contact with the side wall of the road. A hot water generator for generating hot water circulating in the hot water chamber,
A water tank for storing warm water,
The aquarium has a plurality of partition plates arranged side by side by standing at a predetermined interval and standing in the vertical direction, which is the direction of gravity.
The plurality of partition plates are positioned such that the lower ends of the adjacent partition plates are positioned above the vertical direction from the inner bottom surface of the water tank, and the upper ends of the other partition plates adjacent to the one partition plate are The hot water generating water is vertically moved in the vertical direction by being alternately shifted up and down in the water tank of the water tank so as to be positioned below the vertical opening edge of the water tank. While passing from one side in the water tank to the other side in the horizontal direction perpendicular to the vertical direction while moving,
While moving up and down in the vertical direction, the hot water generating water passing from the one side of the water tank to the other side in the horizontal direction perpendicular to the vertical direction is sandwiched from both the upper and lower sides in the vertical direction. 4. A hot water generator for an ink jet printer according to claim 1, further comprising a plate-like heater for heating.   The hot water generating apparatus for an inkjet printer according to claim 4, wherein a peripheral wall of the water tank is covered with a heat insulating material.

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