JP2018134749A - Device for ejecting liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for ejecting liquid, in which contact between heating means and a conveyed object raises temperature of the conveyed object, thus drying liquid, and of which an inexpensive structure prevents the conveyed object from being heated or deformed due to the contact between the conveyed object and the heating means when printing is stopped.SOLUTION: A device 200 for ejecting liquid comprises: a liquid ejection head 7 having nozzles for ejecting liquid; conveying means 1 for conveying a conveyed object S; heating means 11 which is disposed downstream of the conveying means 1, in a conveying direction, and which comes in contact with an unprinted surface of the conveyed object S, thus heating the conveyed object; suction means 16 for sucking air from multiple holes 21 formed at the heating means, thus attaching the conveyed object S to the heating means; and holding means 13, 14 which is provided downstream of the heating means 11, in the conveying direction, and which holds the conveyed object S. When printing is stopped, the liquid ejection head 7 is retracted from a portion over the conveyed object S, suction by the suction means 16 is released, and the conveying means 1 conveys the conveyed object S with the holding means 13, 14 holding the conveyed object S.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an apparatus for discharging a liquid.

  Especially for personal use, the printing speed is relatively low. As an ink jet printer as a conventional device for ejecting liquid, drying time has been shortened due to improvements in ink (liquid) and transported objects. It was mainly due to natural drying without means. Further, since cut paper is mainly used as the object to be transported, no special control related to ink drying has been provided.

  Various methods have been proposed as means for drying the ink printed on the conveyed object. The most common method is to heat a heater plate as a heating member provided facing the recording head in order to promote drying of the ink, and dry the ink printed on the conveyed object. . Even in these methods, no consideration has been given to the control surface for thermal failure of the conveyed object.

  However, in the prior art, even if the heater power source that heats the heater plate is turned off when printing is stopped, the object to be transported stationary on the heater plate continues to be heated until the temperature of the heater plate is naturally cooled. There was a problem of deformation. When the deformed transported object starts printing, the recording head and the deformed transported object come into contact with each other. Therefore, it is necessary to move the deformed portion of the transported object from below the recording head. The conveyed object is wasted (damaged paper).

  For example, Patent Document 1 includes a heater plate 61 and a recording medium adsorbing unit 65 in an ink jet printer 1 that ejects ink droplets from nozzles to print on a recording medium 3, and causes the recording medium 3 to adhere to the heater plate 61. The drying means 60 for heating and drying from the non-recording surface side, the drying means 60 facing the drying means 60 through the recording medium, and the recording medium 3 supported by the blowing means 70 for blowing air on the recording surface and drying the recording medium. The recording medium 3 is provided with a protection means 81 for separating the recording medium 3 from the drying means 60. When printing is stopped, the air blowing means 70 is operated and the suction by the recording medium suction means 65 is released. An ink jet printer is disclosed in which the ink is separated from the drying means 60.

  However, since the protection means 81 is required to separate the recording medium 3 from the heater plate 61 and prevent the recording medium 3 from being deformed, the cost increases as the number of parts increases.

  Accordingly, the present invention provides an apparatus for discharging a liquid that dries a liquid by raising the temperature of the transported object by contact between the heating unit and the transported object, and the transported object is in contact with the heating unit when printing is stopped. It is an object to prevent the conveyed object from being heated or deformed by an inexpensive configuration.

  The problem is that a liquid discharge head having a nozzle for discharging a liquid, a transfer means for transferring an object to be transferred, and a downstream of the transfer means in the transfer direction of the transfer object, contact the non-printing surface of the transfer object. A heating unit that heats the heating unit, a suction unit that sucks air to be conveyed from the plurality of holes formed in the heating unit, and a downstream of the heating unit in the conveyance direction of the conveyance unit A holding means for holding the conveyed object, and when printing is stopped, the liquid discharge head is retracted from the conveyed object, the suction by the adsorption means is released, and the conveyed object is moved by the holding means. This is solved by an apparatus for ejecting a liquid, characterized in that the object to be conveyed is conveyed by the conveying means while pressing.

  It is possible to prevent the conveyed object from being heated or deformed by an inexpensive configuration when the conveyed object is in contact with the heating unit when printing is stopped.

It is a figure which shows the structure of the apparatus which discharges the liquid which concerns on one Embodiment of this invention. FIG. 2 is a detailed view of a portion A in FIG. 1, and is a schematic cross-sectional view illustrating a state in which an object to be conveyed is pressed against a hollow portion by a stopper member when printing is stopped. It is a block diagram which shows the structure of the control system of the apparatus which discharges the liquid which concerns on embodiment. It is the schematic which shows operation | movement of the printing part at the time of printing. It is the schematic which shows operation | movement of the printing part at the time of printing stop. It is a flowchart which shows operation | movement of the printing part at the time of the printing stop of the apparatus which discharges a liquid.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a configuration of an apparatus for ejecting liquid according to an embodiment of the present invention.
The apparatus 200 for discharging liquid is supported by the pedestal 19, the wheel 20 attached to the lower part of the pedestal 19, the support 18 extending vertically upward from the pedestal 19, and the support 18 disposed on the support 18. And a housing 31. The paper feeding unit 9 is disposed at the lower part of the casing 31 at the rear of the apparatus 200 for ejecting liquid, and the winding unit 10 for the conveyed object S is above the pedestal 19 at the front of the apparatus 200 for ejecting liquid. Is arranged.

  An unused roll paper around which a continuous sheet-like object S is wound is mounted on the paper feeding unit 9 of the apparatus 200 that ejects liquid. The width of the object to be transported S used is, for example, several meters. The transported object S supplied from the paper supply unit 9 is supplied with a driving force by a motor 111 (FIG. 3), the transport roller 1 serving as transport means for transporting the transported object S, and the weight of the transported object S. Then, it is nipped with the pressure roller 2 that rotates in contact with the surface. The pressure roller 2 is supported by an arm 3 and is urged to the transport roller 1 by an elastic force. The conveyance roller 1 and the pressure roller 2 arranged to face the conveyance roller 1 constitute a conveyance roller pair. The pair of transport rollers is arranged upstream of the head 7 of the printing unit 50 as indicated by an arrow X, and the transport target S is transported by the rotation of the transport roller 1, and the transport target transport direction ( Also in the sub-scanning direction). The transferred object S passes through the printing unit 50.

  In the present embodiment, continuous paper wound in a roll shape is used as the transported object, but the transported object that can be used in an apparatus that discharges liquid is not limited to roll paper. That is, the transported object may be cut paper. In addition, liquids adhere to plain paper, high-quality paper, thin paper, thick paper, recording paper and roll paper, OHP sheets, synthetic resin films, metal thin films, and other surfaces to the transported objects that can be used with liquid ejecting devices. Includes what is possible. Here, the roll paper is continuous paper (continuous form paper, continuous form) in which cuttable perforations are formed at a predetermined interval. Further, a page (page) on the roll paper is, for example, an area sandwiched between perforations at a predetermined interval.

  The printing unit 50 of the apparatus 200 for ejecting liquid guides a head 7 as a liquid ejection head having a nozzle for ejecting liquid, and a guide 6 that holds the head 7 and extends in the main scanning direction orthogonal to the sub-scanning direction. And a carriage 8 that reciprocates in the main scanning direction and a heater plate 11 that is disposed downstream of the conveyance roller 1 in the conveyance direction of the conveyance object and that is a heating unit that contacts and heats the non-printing surface of the conveyance object S. Have. The heater plate 11 is a flat metal plate, for example, a copper plate. Based on a command from the control unit 100 (FIG. 3) provided in the apparatus 200 for ejecting liquid, the reciprocating movement of the carriage 8 holding the head 7 in the main scanning direction and the conveyance of the object to be conveyed S in the sub scanning direction are performed. By repeating alternately, a liquid image (ink image) is formed on the conveyed object S. The apparatus 200 for ejecting liquid in the present embodiment is a serial apparatus.

  The heating device 40 of the apparatus 200 that discharges liquid includes a heater plate 11, a heater 4 that is disposed on the back side of the heater plate 11 and that heats the heater plate 11, and a chamber between the heater plate 11 by covering the heater 4. 25, and a temperature sensor 12 that measures the temperature of the heater plate 11. The heating device 40 is provided to face the head 7. In the present embodiment, five heaters 4 are provided, but the present invention is not limited to this. The temperature sensor 12 is provided near the back surface of the heater plate 11 in the chamber 25 and is preferably covered with a shielding member so that heat from the heater 4 does not reach the temperature sensor 12 directly. Based on the command of the control unit 100 (FIG. 3), the heater 4 is controlled to be turned on / off based on the detection result of the temperature sensor 12, so that the temperature of the heater plate 11 and the object to be conveyed that contacts the heater plate 11 are controlled. It becomes possible to adjust the temperature of S to an appropriate temperature necessary for drying the liquid. The temperature sensor 12 is, for example, a thermocouple thermometer.

  By the way, the continuous sheet-like object S used in the apparatus 200 for discharging liquid capable of high-speed printing and high-speed conveyance is wound or folded by the winding unit 10 immediately after printing by the printing unit 50. Need to be. Therefore, in order to prevent the printing quality from being deteriorated due to transfer of the printed liquid to other parts of the transported object S, it is necessary to dry and fix the liquid in a short time. By heating the transported object S from the back side (non-printing surface side) by the heating device 40 provided with the heater 4 facing the printing unit 50, liquid permeation can be performed immediately after printing on the transported object S. Evaporation drying starts, and the drying and fixing of the liquid is accelerated.

  The chamber member 5 installed under the heater plate 11 is made of a sheet metal having a U-shaped cross section and is adjacent to the bottom of the chamber member 5 based on a command from the control unit 100 (FIG. 3). The pressure in the chamber 25 is controlled by discharging the air in the chamber 25 by the suction fan 16 installed. Further, since a plurality of holes 21 (FIGS. 4 and 5) through which air passes are formed in the heater plate 11, the pressure in the chamber 25 is controlled by the suction fan 16 to the heater 4 of the conveyed object S. It is possible to control the contact state. That is, the suction fan 16 is a suction unit that sucks the transported object S to the heater plate 11 by sucking air from the plurality of holes 21 formed in the heater plate 11. The suction fan 16 creates a negative pressure in the chamber 25 and the object to be conveyed S is adsorbed to the heater plate 11 heated by the heater 4, whereby the liquid image formed on the object to be conveyed S is heated and dried. The

  The apparatus 200 that discharges liquid includes a pressing unit that is provided downstream of the heater plate 11 in the transported object transport direction and presses the transported object S in a direction orthogonal to the transported object transport direction. Specifically, the holding means guides the object to be conveyed S between the guide plate 14 and the outer guide plate 15 that guide the object to be conveyed S to form the conveyance path 30 for the object to be conveyed, and the guide plate 14. The stopper member 13 is configured to stop and fix the transport of the transported object S by pinching. With such a configuration, the pressing means can be configured at low cost.

  The upper end of the guide plate 14 is connected to the downstream end of the heater plate 11 with no difference in level, and the lower end of the guide plate 14 is connected to a housing lower plate 29 extending horizontally from the column 18. The upper end of the outer guide plate 15 is connected to the housing 31, and the lower end of the outer guide plate 15 extends from the support column 18 to the vicinity of the lower housing plate 29 extending in the horizontal direction.

  On the other hand, the apparatus 200 for discharging liquid has a guide plate 28 that guides the object to be conveyed S and forms a conveyance path 30 for the object to be conveyed upstream of the heater plate 11 in the object conveyance direction. The upper end of the guide plate 28 is connected to the upstream end of the heater plate 11 with no difference in level, and from there, the guide plate 28 smoothly curves downward to the vicinity of the casing 31 and extends toward the paper feed unit 9. Exist.

  Accordingly, the conveyance path 30 for the object to be conveyed S extends obliquely upward from the sheet feeding unit 9 and is connected to the flat heater plate 11 after passing through the pair of conveyance rollers, and is downstream of the heater plate 11 in the object conveyance direction. After passing through the end, it extends obliquely downward and reaches the winding unit 10.

  Since the guide plate 28, the guide plate 14, and the outer guide plate 15 are smoothly curved, the conveyance path 30 from the paper feeding unit 9 to the winding unit 10 through the printing unit 50 has a smooth shape. The transported object S transported in the transport path 30 is not easily damaged. The transported object S that has been transported and dried in the transport path 30 is wound up in a roll shape by the winding unit 10 disposed in the vicinity of the pedestal 19.

FIG. 2 is a detailed view of a portion A in FIG. 1, and is a schematic cross-sectional view showing a state in which the object to be conveyed is pressed against the recessed portion by the stopper member when printing is stopped.
As shown in the figure, a U-shaped recess 23 is formed in the guide plate 14 at right angles to the transported object transport direction over the entire width of the guide plate 14, and the transported object S is formed by the recess 23 and the stopper member 13. Is caught. The stopper member 13 is a flat plate member made of resin, for example, and has a wedge-shaped cross section. The tip of the stopper member 13 that contacts the object to be conveyed S is rounded, and the object to be conveyed S is prevented from being damaged at the time of contact. One end of the stopper member 13 is fixed to the shaft 27, and the stopper member 13 can be rotated about the shaft 27 by the driving force from the motor 111 connected to the shaft 27. In FIG. 2, the stopper member 13 is rotated from the horizontal position indicated by the broken line toward the holding position indicated by the solid line toward the hollow portion 23, and at the holding position, the tip of the stopper member 13 is formed by the hollow portion 23. It enters into the depression 33. As a result, the conveyed object S is sandwiched between the stopper member 13 and the recess 23 of the guide plate 14. By sandwiching the object to be conveyed S between the recess 23 and the stopper member 13, the object to be conveyed S can be warped and easily lifted from the heater plate 11. Moreover, the conveyance of the conveyed object S can be stopped by pressing the conveyed object S with the stopper member 13.

  As described above, when the transported object S is sandwiched by the stopper member 13 when printing is stopped, the transported object S is positioned upstream of the recessed portion 23 in the transported object transport direction due to the rigidity of the transported object S itself. 14, a small gap is formed between the conveyed object S and the guide plate 14. Further, the object to be conveyed S is conveyed by the conveyance roller 1 positioned upstream in the object conveyance direction while the object S is pressed by the stopper member 13 located downstream in the object conveyance direction. A large gap 35 is formed between the guide plate 14 and the heater plate 11. In this way, the conveyed object S warps from the guide plate 14 and the heater plate 11 and is reliably separated from the heater plate 11. Therefore, heating and deformation of the conveyed object S due to the conveyed object S being in contact with the heater plate when printing is stopped can be prevented with a simple and inexpensive configuration of the recessed portion 23 and the stopper member 13. .

  Moreover, the cross-sectional shape of the hollow part 23 of the guide plate 14 is not limited to the U shape, and may have a U shape or another shape.

FIG. 3 is a block diagram illustrating a configuration of a control system of the apparatus for ejecting liquid according to the embodiment.
The control unit (controller) 100 includes a CPU 101, a ROM 102, an EEPROM 103, and a RAM 104 formed on a substrate. The interface 105 is a USB interface, for example, and connects the control unit 100 and a host device 1000 such as an external PC to enable bidirectional communication based on a predetermined protocol. Detection results of the encoder 106 and the temperature sensor 12 are input to the control unit 100. The encoder 106 is a rotary encoder that detects the rotation of the conveyance roller 1 and a linear encoder that detects the position of the carriage 8. The various sensors 107 are, for example, sensors that detect the front and rear ends of the object to be conveyed S, sensors that optically detect the conveyance state of the object to be conveyed S, and the like.

  A motor driver 109 and a head drive circuit 110 are connected to the control unit 100. The motor driver 109 drives various motors 111 that are driving sources for the operations of the transport roller 1 and the carriage 8 based on commands from the control unit 100. The head driving circuit 110 individually drives a plurality of nozzles of the head 7 on the basis of a command from the control unit 100 to discharge liquid. Further, a suction fan control circuit 113, a heater control circuit 114, and a blower fan control circuit 115 are connected to the control unit 100. The suction fan control circuit 113 controls the rotation state of the suction fan 16 based on a command from the control unit 100. The heater control circuit 114 controls the heat generation state of the heater 4 that is a heating source based on a command from the control unit 100. The blower fan control circuit 115 controls the rotation state of the blower fan 17 based on a command from the control unit 100. Air is blown out toward the heater plate 11 by the rotation of the blowout fan 17, and the heated heater plate 11 is cooled.

  In the printing sequence in the above configuration, the reciprocating movement (main scanning) of the head 7 by the carriage 8 and the conveyed object conveyance (sub scanning) are alternately repeated, so that a two-dimensional liquid image is serially formed on the conveyed object S. Based on serial printing that forms In the main scanning in serial printing, a so-called multi-pass printing method is adopted, in which the carriage 8 is reciprocated and liquid is applied to the same portion of the transported object S several times to complete the image.

FIG. 4 is a schematic diagram illustrating the operation of the printing unit during printing.
At the time of printing, a liquid image is formed on the transported object S while reciprocating the head 7 on the transported object S in the main scanning direction along the guide 6 based on a command from the control unit 100. At this time, the suction fan 16 is driven to discharge the air in the chamber 25 as indicated by an arrow 37, and the inside of the chamber 25 is set to a negative pressure. Since the heater plate 11 has a plurality of holes 21 formed along the main scanning direction at equal intervals in the sub-scanning direction, the conveyed object S located near the upper surface of the heater plate 11 is sucked from the holes 21. Is adsorbed to the heater plate 11 by the air. The hole 21 is formed over the entire width of the heater plate 11. The main scanning direction width of the heater 4, the chamber member 5, the heater plate 11, the guide plate 14, and the stopper member 13 is larger than the maximum transported object width used in the apparatus 200 for ejecting liquid.

  The temperature of the heater plate 11 is required for drying the liquid by controlling the ON / OFF of the heater 4 while detecting the temperature of the heater plate 11 with the temperature sensor 12 based on the command of the control unit 100 (FIG. 3). To a constant temperature. Since the object to be conveyed S is heated when it contacts the heater plate 11, the liquid image formed on the object to be conveyed S is dried.

  At the time of printing, the stopper member 13 of the printing unit 50 is open and oriented in the substantially horizontal direction, and the conveyed object S is not pressed against the recessed portion 23 by the stopper member 13. Therefore, the conveyed object S is conveyed toward the winding unit 10 along the guide plate 14 by the rotation of the conveying roller 1.

FIG. 5 is a schematic diagram illustrating the operation of the printing unit when printing is stopped.
When printing is stopped, the motor 111 is driven based on a command from the control unit 100, and the carriage 8 carrying the head 7 is retracted outside the conveyed object S and the heater plate 11 along the guide 6. Thereafter, the suction fan 16 is operated while the heater 4 is operated and the heater plate 11 is heated until the required time elapses after the printing is stopped, and the conveyed object S is adsorbed to the heater plate 11. Thereby, the liquid on the to-be-conveyed object S is dried and the liquid is prevented from being dried.

  Next, after the required time has elapsed, the power of the heater 4 and the suction fan 16 is turned off, and the heating of the heater plate 11 and the suction of the conveyed object S by the suction fan 16 are released. Next, the stopper member 13 is rotated with respect to the recessed portion 23 by driving the motor 111, and the object to be conveyed S is pressed against the recessed portion 23 of the guide plate 14 to be fixed, and the object to be conveyed S is floated from the guide plate 14. . Next, the transport roller 1 is rotated by driving the motor 111 to transport the transported object S. By transporting the transported object S by the transport roller 1 positioned upstream in the transported object transport direction while fixing the transported object S by the stopper member 13 and the guide plate 14 positioned downstream in the transported object transport direction, The conveyed object S can be warped and separated from the heater plate 11, and a large gap 35 is formed between the conveyed object S and the heater plate 11. In this way, it is possible to prevent the conveyed object from being heated or deformed by an inexpensive configuration when the conveyed object is in contact with the heating unit when printing is stopped.

  Here, the time required after the printing is stopped can be changed depending on the type and thickness of the conveyed object S. As a result, the effect of preventing the liquid from drying out can be maximized, and the amount of deformation of the conveyed object can be minimized.

  Finally, after the temperature of the heater plate 11 detected by the temperature sensor 12 falls to a predetermined temperature or after a certain time has elapsed, the motor 111 is driven based on a command from the control unit 100 and the stopper member 13 is moved to the guide plate 14. To prepare for the next printing operation.

FIG. 6 is a flowchart showing the operation of the printing unit when printing of the apparatus for ejecting liquid is stopped. The operation in each step is performed based on a command from the control unit 100.
When printing of the apparatus 200 that discharges the liquid is stopped, the head 7 is moved in the main scanning direction in step S <b> 1 to be retracted to the outside of the conveyed object S or the heater plate 11. Here, when the printing is stopped, the case where the printing is stopped due to some abnormality during the printing of the apparatus 200 that discharges the liquid, the case where the printing is stopped by a user instruction, the case where the printing is finished, and the like are included. Next, in step S <b> 2, the heater 4 and the suction fan 16 are operated, and while the heater plate 11 is heated, the inside of the chamber 25 is set to a negative pressure to adsorb the conveyed object S to the heater plate 11. Next, the heating of the heater plate 11 and the suction of the transported object S to the heater plate 11 are continued until the required time after the printing is stopped in step S3 (S3, Yes). Thereby, the liquid image formed on the conveyed object S is dried. Note that the time required to dry the liquid image varies depending on the type and thickness of the conveyed object S.

  Next, after the required time has elapsed (S3, Yes), the heater 4 and the suction fan 16 are turned off in step S4. Next, in step S <b> 5, the conveyed object S is pressed against the recess 23 of the guide plate 14 by the stopper member 13 and fixed. Thereby, the to-be-conveyed object S floats away from the guide plate 14 due to the rigidity of the to-be-conveyed object S itself. Next, the object to be transported S is transported by the rotation of the transport roller 1 in step S6. In a state where the transported object S is fixed in front of the transported object transport direction, the transported object S is transported from behind, so that the transported object S bends and is largely separated from the heater plate 11. At this time, since the head 7 is retracted to the outside of the conveyed object S or the heater plate 11 in step S1, the bent conveyed object S does not contact the head 7. Therefore, distortion of the conveyed object S on which the liquid image is formed is prevented. In this way, unnecessary heating of the conveyed object S due to contact with the heater plate 11 when printing is stopped can be prevented. In addition, the conveyance distance of the to-be-conveyed object S should just be the distance which the to-be-conveyed object S bends and is fully spaced apart from the heater board 11. FIG.

  Next, in step S7, the object to be conveyed S is separated from the heater plate 11 until the temperature sensor 12 detects that the heater plate 11 has naturally decreased to a predetermined temperature or until a predetermined time has elapsed from step S6. Let me. Next, in step S8, the stopper member 13 is released from the hollow portion 23 of the guide plate 14, and the fixation of the conveyed object S is released to prepare for the next printing operation (END).

  As described above, according to the present invention, in a device that discharges a liquid that dries a liquid by raising the temperature of a transported object by contact between the heating unit and the transported object, the transported object becomes a heating unit when printing is stopped. It is possible to prevent the conveyed object from being heated or deformed by being in contact with an inexpensive configuration.

  As an image forming apparatus such as a printer, a facsimile machine, a copying machine, a plotter, and a multi-function machine having these functions, for example, an image forming apparatus of a liquid discharge recording method using a recording head that discharges ink droplets (liquid droplets) Device) is known. Such an apparatus for ejecting liquid ejects ink droplets from the nozzles of a recording head onto a transported object to form an image (recording, printing, printing, printing is also synonymous, and has the meaning of characters, figures, etc. Including not only applying an image to a medium, but also an act of applying an image having no meaning such as a pattern to the medium (simply referred to as droplet ejection or liquid ejection that causes a droplet to land on the medium) 3D images (stereoscopic images) as well as 2D images). In addition, a liquid discharge head (droplet discharge head) used as a recording head is a functional component that discharges and ejects liquid from nozzles, and a diaphragm is displaced by a piezoelectric actuator or the like to change the volume in the liquid chamber, thereby increasing the pressure. There are known piezoelectric heads that discharge and discharge liquid droplets, and thermal heads that provide a heating element that generates heat when energized in the liquid chamber and increase the pressure in the liquid chamber by bubbles generated by the heating element and discharge liquid droplets. Yes.

  Further, in the present application, the “liquid” discharged from the liquid discharge head is not particularly limited as long as it has a viscosity and surface tension that can be discharged from the head. Is preferably 30 mPa · s or less. More specifically, “liquid” refers to solvents such as water and organic solvents, colorants such as dyes and pigments, functional compounds such as polymerizable compounds, resins, and surfactants, DNA, amino acids, proteins, calcium These include solutions, suspensions, emulsions, and the like containing biocompatible materials such as natural pigments, edible materials such as natural pigments, etc., and these include, for example, inkjet inks, surface treatment liquids, components of electronic devices and light emitting devices, It can be used in applications such as a liquid for forming an electronic circuit resist pattern and a material liquid for three-dimensional modeling. “Liquid ejection unit” is a collection of parts related to liquid ejection, in which other functional parts and mechanisms are integrated with the liquid ejection head, for example, at least one of a carriage, a head tank, a liquid supply mechanism, and a maintenance and recovery mechanism It is comprised including. The “device for discharging liquid” is a device for driving the liquid discharge head to discharge the liquid. The apparatus for ejecting liquid includes not only an apparatus capable of ejecting liquid to an object to which liquid can be attached, but also an apparatus for ejecting liquid toward air or liquid, and an image forming apparatus In addition to these, there are a three-dimensional modeling apparatus, a treatment liquid coating apparatus, a jet granulating apparatus, and the like.

1 Conveying roller (conveying means)
7 Head (Liquid discharge head)
11 Heater plate (heating means)
13 Stopper member (pressing means)
14 Guide plate (pressing means)
16 Suction fan (adsorption means)
21 Hole 100 Device for discharging liquid S

JP-A-2005-1303

Claims (5)

A liquid discharge head having a nozzle for discharging liquid;
Transport means for transporting the object to be transported;
A heating unit that is disposed downstream of the transport unit in the transport direction of the transported object and that contacts and heats the non-printing surface of the transported object;
An adsorbing means for adsorbing an object to be conveyed to the heating means by sucking air from a plurality of holes formed in the heating means;
A holding means for holding the object to be conveyed, provided downstream of the heating means in the object conveyance direction,
When the printing is stopped, the liquid ejection head is retracted from the transported object, the suction by the suction unit is released, and the transported object is transported by the transporting unit while the transported object is pressed by the pressing unit. A device for discharging a liquid characterized by the above.   The presser means includes a guide plate that guides the object to be conveyed, and a stopper member that fixes the object to be conveyed by sandwiching the object to be conveyed between the guide plates. An apparatus for discharging the liquid according to 1.   3. The liquid according to claim 2, wherein the guide plate has a recessed portion that extends at right angles to a transported object transport direction, and sandwiches the transported object between the recessed portion and the stopper member. Device to do. After retreating the liquid ejection head from the transported object when printing is stopped, heating the heating unit and sucking by the suction unit until the required time elapses after printing is stopped,
After the required time has elapsed, heating of the heating unit is stopped and suction by the suction unit is released, and the transported object is transported by the transporting unit while the transported object is pressed by the pressing unit. The apparatus which discharges the liquid as described in any one of Claims 1-3 characterized by the above-mentioned. The apparatus for ejecting liquid according to claim 4, wherein the required time is changed according to a type and a thickness of an object to be conveyed.

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