JP5578320B2 - Inkjet printer - Google Patents

Description

  The present invention relates to an inkjet printer, and more particularly to a business inkjet printer capable of label printing using roll paper as a printing medium.

  In recent years, in an ink jet printer that performs printing by spraying fine particles of ink onto a printing surface from a print head, a serial head system that performs printing while the print head reciprocates in a direction perpendicular to the conveyance direction of the print medium There is also known a product using a line-type head system that enables printing on the entire paper by transporting the printing paper while the print head is fixed.

  Patent Document 1 discloses an ink jet printer that applies a line-type head system and uses a print medium as roll paper.

JP 2010-006535 A

  By the way, the extent to which each ink particle landed on the surface of the print medium from the print head spreads on the print medium is a matter directly related to the finish of ink jet printer printing. For example, how the ink particles spread If there is a shortage of ink, a printed surface that looks blurred may be formed. The spreading method of the ink particles is greatly influenced by the properties of the ink and the roll paper, but the method of changing the ink every time the roll paper is changed to a product having a different property causes an increase in work man-hours and running costs. It will be.

  In the technique described in Patent Document 1, even if the roll paper is changed to one having different properties, there is no examination or suggestion regarding a method that enables good printing without changing the type of ink. There wasn't.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of the prior art and to provide an ink jet printer that can perform appropriate printing in response to changes in the properties of roll paper without changing the type of ink.

  In order to achieve the above object, the present invention uses a roll paper (11) as a printing medium and performs printing while maintaining a predetermined position with respect to the roll paper (11) conveyed on a conveyance path. In the ink jet printer (1) having the print head unit (16) of the mold, the roll paper (1) is located at a position upstream of the transport path of the roll paper (11) with respect to a predetermined position of the print head unit (16). The first feature is that a heater (30) for heating 11) is provided.

  The heater (30) has a second feature in that the heater (30) is made of a plate-like member that comes into surface contact with the roll paper (11).

  The heater (30) has a third feature in that the heater (30) contacts the back side of the printing surface of the roll paper (11).

  A first guide roller (61a) that freely rotates at a predetermined position and guides the roll paper (11) downward and downstream, and the roll paper (downward guided by the first guide roller (61a)) 11) a dancer roll (14) for guiding the upper side and the downstream side and moving freely in the vertical direction to adjust the tension of the roll paper (11); and the dancer roll (14) which freely rotates at a predetermined position and And a second guide roller (61b) for guiding the roll paper (11) guided upward by another direction, and the heater (30) is located downstream of the dancer roll (14) and the second guide. A fourth feature is that the roller (61b) is disposed at a position upstream of the roller (61b).

  A fifth feature is that a plurality of free rollers (31) are provided at positions facing the heater (30) and press the roll paper (11) against the heater (30). .

  In addition, the heater (30) is configured to be arbitrarily movable between a first position in contact with the roll paper (11) and a second position separated from the roll paper. There are 6 features.

  The heater (30) has a seventh feature in that the heater (30) is configured to be movable between the first position and the second position by the driving force of the actuator (39).

  Furthermore, UV ink that is cured by irradiating ultraviolet rays is supplied to the print head unit (16), and the roll paper (11) is transported along the transport path of the print head unit (16). An eighth feature is that an ultraviolet irradiation device (17) for irradiating the ultraviolet rays is disposed at a downstream position.

  According to the first feature, a heater for heating the roll paper is provided at a position upstream of the roll paper conveyance path with respect to a predetermined position of the print head unit. Even in a state where the spread when landing is small, the viscosity of the ink can be lowered by heating the roll paper, and the spread of the ink particles can be corrected to an appropriate value. As a result, even when the ink particle spread becomes insufficient due to the change in the properties of the roll paper, good printing can be performed without changing the ink.

  According to the second feature, since the heater is composed of a plate-like member that comes into surface contact with the roll paper, the size of the heater is increased along the roll paper conveyance direction, and the roll paper that slides at high speed is effective. Can be heated. In addition, the roll paper can be heated with a simple structure and a thin heater.

  According to the third feature, since the heater contacts the back side of the printing surface of the roll paper, the time until the printing surface reaches a predetermined temperature is set longer than in the configuration in which the printing surface side is heated. It is possible to prevent heating unevenness and to easily heat the printing surface to a predetermined temperature.

  According to the fourth feature, the first guide roller that freely rotates at a predetermined position and guides the roll paper downward and downstream, and the roll paper guided downward by the first guide roller upward and downstream. A dancer roll that guides and moves freely in the vertical direction to adjust the tension of the roll paper, and a second guide roller that freely rotates at a predetermined position and guides the roll paper guided upward by the dancer roll in another direction And the heater is disposed at a position downstream of the dancer roll and upstream of the second guide roller, so that the heater is disposed at a place where the roll paper is conveyed upward from below. In particular, it is possible to prevent the printer main body from being enlarged in the roll paper conveyance direction. Accordingly, it becomes easy to increase the size of the heater and stabilize the heating function.

  According to the fifth feature, the roll paper is disposed at a position facing the heater and includes a plurality of free rollers that press the roll paper against the heater. It becomes possible to heat.

  According to the sixth feature, since the heater is configured to be arbitrarily movable between a first position that contacts the roll paper and a second position that is separated from the roll paper, the heater heats the roll paper. Only when necessary, the heater can be brought into contact with the roll paper.

  According to the seventh feature, since the heater is configured to be movable between the first position and the second position by the driving force of the actuator, the heater is brought into contact with the roll paper when printing is started. On the other hand, it is possible to automatically control the position of the heater such as separating the heater from the roll paper in accordance with the stop of printing.

  According to the eighth feature, the print head unit is supplied with UV ink that is cured by irradiating with ultraviolet rays, and is positioned downstream of the roll paper transport path with respect to the position where the print head unit is disposed. Since an ultraviolet irradiation device for irradiating ultraviolet rays is provided, an excellent ink jet printer using a heater is used in an inkjet printer that uses a roll-type print head and a line-type print head and prints using UV ink. Printing can be executed. Also, since UV ink can be cured in a very short time by irradiating with ultraviolet rays, the roll-up position of the roll paper can be brought closer to the print head side by arranging the ultraviolet irradiation device immediately after the print head. Become. Thereby, the size of the printer main body can be reduced.

1 is an overall perspective view of an inkjet printer according to an embodiment of the present invention. It is a front view which shows the internal structure of an inkjet printer. It is a top view which shows the internal structure of an inkjet printer. FIG. 4 is a view in the H direction of FIGS. FIG. 5 is a view in the A direction of FIG. 4. It is a B direction view of FIG. FIG. 5 is a C direction view of FIG. 4. It is a front view of the ink jet printer with the main body exterior cover attached. FIG. 9 is an enlarged view of the periphery of the paper feed roll in FIG. 8. FIG. 3 is an enlarged view of the vicinity of a paper feed roll when the inkjet printer is viewed from the back side. FIG. 6 is an explanatory diagram illustrating a state in the middle of attachment / detachment of a paper feed roll. It is a J direction view of FIG. FIG. 9 is a view in the K direction of FIG. FIG. 9 is a view in the K direction of FIG. 8 in a state where the paper feed roll is in a predetermined position.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall perspective view of an ink jet printer 1 (hereinafter sometimes simply referred to as a printer) according to an embodiment of the present invention. The printer 1 includes a line-type print head that performs printing while maintaining a predetermined position with respect to the roll paper conveyed from the paper supply roll 9 to the paper discharge roll 10, and further UV ink that is cured by irradiation with ultraviolet rays. The use of (ultraviolet curable ink) and an ultraviolet irradiation device that cures the ink in a short time enable high-speed printing. The printing speed is, for example, 50 m / min at the maximum, and roll paper having a length exceeding 400 m can be used. Note that various types of label paper (TAC paper), synthetic paper, PET paper, and the like can be applied to the roll paper. After printing, it is cut into a predetermined size and used as a label or the like.

  The printer 1 mainly includes a paper supply unit 5 that stores a paper supply roll 9 before printing, a paper discharge unit 6 that stores a paper discharge roll 10 wound up after printing, and a control system storage in the center. It has a three-part structure composed of the part 7. In the upper part of the control system storage unit 7, there are provided a print head storage unit 2 in which a print head and the like are stored, and a fixing unit 3 in which an ultraviolet irradiation device for curing and fixing UV ink sprayed on the printing surface is stored. It has been. An exhaust duct 4 for discharging odor generated during printing is attached to the top of the fixing unit 3, and an operation panel 8 for performing various operations of the printer 1 is provided on the front surface of the print head storage unit 2. ing. In addition to various operation switches, the operation panel 8 includes a display unit that displays a roll paper conveyance speed, various warnings, and the like. In addition, the main body exterior cover of the printer 1 can be configured so that the roll paper conveyance state and the printing state can be visually confirmed by using a transparent material or a viewing window at a predetermined position.

  2 and 3 are a front view and a top view showing the internal structure of the printer 1. The same reference numerals as those described above denote the same or equivalent parts. The main body of the printer 1 has a long shape along the roll paper conveyance direction (left-right direction in the figure), and is configured to have a maximum dimension in the left-right direction in the figure of about 3 m and a maximum dimension in the front-rear direction in the figure of about 1 m. Is done. A plurality of casters 25 are provided on the lower surface of the printer 1, and the installation location can be moved in the assembled state.

  The print head storage unit 2 stores a print head unit 16 having a print head 16a and a maintenance unit 26.

  Below the print head unit 16, a suction box 16b is provided for sucking the roll paper 11 downward by negative pressure to keep a constant gap between the print head unit 16 and the printing surface. Further, the print head unit 16 is provided with a sensor for detecting the lifting of the roll paper 11, and it can be set not to start printing when the lifting is detected.

  The fixing unit 3 houses an ink bottle 18 and an ink supply pump 28 in addition to an ultraviolet irradiation device 17 for fixing and curing printed UV ink.

  The control system storage unit 7 stores a control unit 21 that drives and controls the roll paper transport mechanism, the print head unit 16 and the like, a power supply device 22 of the ultraviolet irradiation device 17, a waste liquid bottle 23, and a suction blower 24. The printer 1 can print the image data received from the client PC via the USB interface or the like as it is. Further, the exhaust duct 4 shown in FIG. 1 is provided slightly to the left side in the drawing, that is, on the downstream side in the transport direction of the roll paper 11 with respect to the ultraviolet irradiation device 17.

  The roll paper 11 transported from the paper feed roll 9 is transported to the print head storage section 2 slightly above the paper feed section 5, and then when printing is performed by the print head unit 16, The UV ink is cured and fixed by the irradiation device 17, and is finally wound up as a printed paper discharge roll 10 by the paper discharge unit 6. Hereinafter, the structure of each part will be described along the conveyance path of the roll paper 11.

  First, a roll holder 9 a of a paper feed roll 9 is detachably attached to the paper feed unit 5. The roll holder 9a is configured to be easily lifted by a jig (not shown). When the paper supply roll 9 is mounted on the paper supply unit 5, the roll holder 9a is lifted to the upper part of the horizontal upper end surface (see FIG. 11) of the paper supply unit 5 and then moved in the horizontal direction to a predetermined position. It is configured to be wearable. Further, the paper feed unit 9 is provided with a remaining amount detection system for the paper feed roll 9, and is configured to be able to issue an alarm or automatically stop when the remaining amount becomes less than a specified value.

  The roll paper 11 drawn substantially horizontally from the paper feed roll 9 passes between the pressing roller pair 60 and is guided to the upper surface of the media trimming stage 12. The media cutting and pasting stage 12 is a workbench for pasting the leading end of a new paper feed roll 9 to the rear end of the currently set roll paper 11 when the roll paper is exchanged. A clamping mechanism is provided for fixing the rear end. By performing this cutting and pasting operation, it is not necessary to pass the roll paper along the transport path every time the paper supply roll 9 is replaced.

  A first guide roller 61a that is fixed at a predetermined position and freely rotates is disposed on the downstream side of the media trimming stage 12. The roll paper 11 guided downward by the first guide roller 61a is guided upward by a dancer roll 14 configured to be freely rotatable and movable in the vertical direction. The dancer roll 14 has a function of absorbing the tension change of the roll paper 11 by moving in the vertical direction. The paper feeding unit 5 is also provided with a slack amount detection sensor. The roll paper 11 guided upward by the dancer roll 14 is guided in the upper left direction in the drawing by the second guide roller 61b.

  The printer 1 according to the present invention includes a heater 30 for heating the roll paper 11 between the dancer roll 14 and the second guide roller 61b. The heater 30 is configured to contact the roll paper 11 from the back side with respect to the printing surface. The output of the heater 30 is managed by the control unit 21 so as to reach a predetermined temperature (for example, 50 degrees) immediately below the print head unit 16 according to the material, thickness, conveyance speed, and the like of the roll paper 11.

  By heating the roll paper before printing with the heater 30, the ink viscosity when the ink particles land on the roll paper can be lowered, and the insufficient spread of the ink particles can be solved. Thereby, it is possible to control the difference in dot size due to the difference in properties of the roll paper 11 and obtain a stable output image. The heater 30 can be made of metal such as aluminum, and each guide roll can be made of hard resin or the like. Details of the mounting structure of the heater 30 will be described later.

  The roll paper 11 guided in the upper left direction in the figure by the second guide roller 61 b is guided in the substantially horizontal direction by the next guide roller 61, and then contacts the dust removing roller 15.

  The roll paper 11 that has passed through the waste removal roller 15 is sprayed with UV ink from the print head unit 16 in a state of being sucked into the suction box 16b. The printed roll paper 11 a is irradiated with ultraviolet rays while being guided slightly downward by the two pressing rollers 62. After passing through the ultraviolet irradiation device 17, it is guided downward by a transport roller 19 that generates power for transporting the roll paper 11. The transport roller 19 is provided with two pressing rollers 62. The power for transporting the roll paper 11 is generated at three places, that is, the paper feed roll 9, the transport roller 19, and the paper discharge roll 10, and the respective rotational speeds correspond to outputs from the rotational speed sensor and the slack amount detection sensor. Automatically controlled.

  The roll paper 11 guided downward by the transport roller 19 is transported to the paper discharge unit 6 via the two guide rollers 61. The paper discharge unit 6 is also provided with a second dancer roll 20 that adjusts the tension applied to the printed roll paper 11a. The printed roll paper 11 a guided upward by the dancer roll 20 is further guided in the horizontal direction by the guide roll 61, and taken up as the paper discharge roll 10 via the pressing roller pair 63. Note that the roll holder 10 a of the paper discharge roll 10 has the same structure as that of the paper supply roll 9, and can be easily attached to and detached from the paper discharge unit 6.

  FIG. 4 is a view in the H direction of FIGS. 5 is a view in the A direction of FIG. 4, FIG. 6 is a view in the B direction of FIG. 4, and FIG. 7 is a view in the C direction of FIG. The heater 30 according to this embodiment is arranged so as to contact the back surface side with respect to the printing surface at a position downstream of the dancer roll 14 disposed in the paper feeding unit 5 and upstream of the second guide roller 61b. It is the plate-shaped member provided.

  Here, in the printer 1 using the roll paper 11 as a printing medium, the first guide roller 61 a, the dancer roll 14, and the second guide roller 61 b are originally necessary for adjusting the tension of the roll paper 11 in the paper supply unit 5. Accordingly, a certain level difference is ensured between the dancer roll 14 and the second guide roller 61b. On the other hand, in order to quickly heat the roll paper 11 conveyed at high speed, it is effective to lengthen the heater 30 in the conveyance direction. For example, when such a large heater 30 is installed in the horizontal direction, the printer The main body will be enlarged. On the other hand, in the present embodiment, the heater 30 is disposed in the space between the dancer roll 14 and the second guide roller 61b in a substantially vertical direction, so that the heater is not changed in size. Realization of larger size.

  In addition, in order to heat the roll paper 11 reliably, it has a mechanism for pressing the roll paper 11 to the heater 30 using the five free rollers 31, and the heating can be stopped quickly when the roll paper 11 is stopped. In order to achieve this, a mechanism is provided that allows the actuator to arbitrarily move between a contact position (first position) and a separation position (second position).

  Furthermore, by disposing the heater 30 on the back side of the roll paper 11, it is possible to set a longer time until the printing surface reaches a predetermined temperature than in a configuration in which the printing surface side is heated. This makes it easy to heat the printed surface to a predetermined temperature while preventing uneven heating. The output of the heater 30 can be automatically set according to the type and speed of the roll paper based on data obtained in advance through experiments or the like. Further, a sensor for detecting the temperature of the printing surface can be provided in the vicinity of the print head 16a.

  The electric thin plate heater 30 is formed so as to form a convex curved surface on the contact surface side with the roll paper 11. The heater 30 is fixed to the heater mount 37 by a pair of mounting posts 38 in the width direction of the roll paper 11. The heater 30 is configured to be movable between a contact position (solid line) and a separation position (two-dot chain line) shown in FIGS. 5 and 6 by a driving force of a motor 39 as an actuator.

  On the other hand, the five free rollers 31 are supported by a pair of frames (see FIG. 4) 35 in the width direction of the roll paper 11. Specifically, the rotating shaft 32 of the free roller 31 is supported by a pair of roller mounting plates 36 in the axial direction of the rotating shaft 32 via a pressure spring 33. The pair of roller mounting plates 36 are respectively fixed to the frame 35 via the support columns 34. According to this configuration, the roll paper 11 is pressed against the heater 30 by the urging force of the pressure spring 33 by driving the heater 30 to the contact position. The frame 35 that supports the drive mechanism of the heater 30 is fixed to the outer wall of the paper feed unit 5.

  On the other hand, a base 50 for supporting the drive mechanism of the heater 30 is fixed below the frame 35. A pair of levers 44 that support the heater mounting base 37 and a motor 39 including a stepping motor are attached to the base 50. The lower end side of the lever 44 is swingably attached by a fulcrum shaft 45 to a fulcrum shaft mounting base 46 fixed to the base 50. On the other hand, the upper end side of the lever 44 is swingably attached to the heater mount 37 by the operating shaft 42.

  The motor 39 is fixed to the upper surface of the base 50 via the motor mounting plate 43. A swing arm 40 is fixed to the output shaft 48 of the motor 39. Then, the connecting shaft 47 on the distal end side of the swing arm 40 and the operating shaft 42 on the upper end side of the lever 44 are connected by the heater arm 41 to constitute a crank mechanism for driving the heater 30. Each arm, lever, etc. can be made of metal such as aluminum.

  The heater 30 is configured to return to the separation position (first position) where it does not come into contact with the roll paper 11 by the biasing force of the heater return spring 49 when the motor 39 is not generating a driving force. The heater return spring 49 is stretched between the motor mounting plate 43 and the operating shaft 42.

  A timing belt mechanism is provided between the base 50 and the heater mount 37 so that the heater mount 37 moves at the same inclination angle even if the lever 44 swings. The timing belt mechanism includes a first pulley 52 fixed to the heater mount 37 so as not to rotate, a second pulley 53 fixed to the base 50 so as not to rotate, and an endless timing wound between the pulleys 52 and 53. It is composed of a belt 51 and can reciprocate the heater 30 with the same inclination angle.

  As described above, according to the inkjet printer according to the present invention, the heater for heating the roll paper is provided on the upstream side of the print head unit in the roll paper conveyance path, so that when the ink particles land on the roll paper, Even when the spread is small, the spread of the ink particles can be corrected to an appropriate value. As a result, even when the ink particle spread becomes insufficient due to the change in the properties of the roll paper, good printing can be performed without changing the ink.

  Hereinafter, with reference to FIGS. 8 to 14, a detaching mechanism for the paper feed roll and the paper discharge roll will be described. FIG. 8 is a front view of the inkjet printer 1 with the main body exterior cover attached. The same reference numerals as those described above denote the same or equivalent parts. A paper feed roll 9 and a paper discharge roll 10 indicated by a two-dot chain line are respectively disposed at predetermined positions. The paper feed roll 9 and the paper discharge roll 10 are respectively stored in predetermined positions by supporting roll holders 9a and 10a inserted through the core portions between the plate-like frames 70L and 70R. The plate frames 70L and 70R can be formed of resin, metal, or the like. The outer diameter of the roll holder 9a is smaller than the inner diameter of the paper tube around which the roll paper is wound. After the roll holder 9a is inserted into the core of the roll paper, the nail ( By projecting (not shown), the roll paper is fixed from the inside.

  FIG. 9 is an enlarged view of the periphery of the paper feed roll 9 of FIG. FIG. 10 is an enlarged view of the periphery of the paper feed roll 9 when the inkjet printer 1 is viewed from the back side. FIG. 11 is an explanatory view showing a state where the paper feed roll 9 is being attached / detached, and FIG. 12 is a view in the J direction of FIG.

  The paper feed roll 9 is formed by inserting a cylindrical roll holder 9a through the core of the roll paper 11, and in a state where it is stored in a predetermined position shown in FIGS. Two holding rolls 73 that are pivotally supported on the plate-like frame 70L (the front side in the figure in FIG. 8) and a right-side plate-like frame 70R (the back side in the figure in the figure in FIG. 8) that are located on the right side in the roll paper transport direction. The two holding rolls 73 are rotatably held. Further, the driven gear 78 formed at the right end in the transport direction of the roll holder 9a is configured to mesh with the drive gear 81 that is pivotally supported on the right plate-like frame 70R side in the state where it is stored in a predetermined position. Has been.

  Referring to FIG. 12, drive gear 81 and driven pulley 82 are connected in an integral structure and are rotatably supported on fixed shaft 91. An endless belt 90 is wound around the driven pulley 82 and a driving pulley 84 fixed to the output shaft of the driving motor 85. As a result, the paper feed roll 9 can be rotationally driven by the output of the drive motor 85.

  A fixed plate 77 is fixed to the right plate frame 70R by two fixed shafts 90, and a holding roller 73 made of resin or the like is rotatably supported by the fixed plate 77. On the other hand, a fixed plate 72 is fixed to the left plate-like frame 70L by two fixed shafts 75 and two support shafts 74, and two holding plates are provided between the fixed plate 72 and the left plate-like frame 70L. A moving plate 89 to which a roller 73 is attached is supported so as to be movable along a support shaft 74 and a fixed shaft 75. The moving plate 89 is fitted to the pinion shaft 76a and rotates the knob 76 connected to the pinion shaft 76a, whereby the distance from the left plate frame 70L of the moving plate 89 is changed and the set position of the roll holder 9a is moved. By doing so, the center position of the roll paper can be moved and the position printed on the roll paper can be finely adjusted.

  In addition, a restriction plate 71 that is in contact with a restriction disk 79 provided at the left end of the roll holder 9a is fixed to the moving plate 89. By fitting the restriction plate 71 with the groove of the restriction disk 79, the sheet feeding roll 9 can be reliably stopped at a predetermined position.

  The paper feed roll 9 can be easily lifted by the dedicated hooks 100 that engage with both ends of the roll holder 9a. As shown in FIG. 11, the dedicated hook 100 includes a columnar handle 101 and a pair of left and right plate arms 102 connected to the handle 101, and a roll holder 9 a is attached to the tip of the plate arm 102. This is a dedicated part in which a hook-like hook portion 103 is formed. The dedicated hook 100 can be formed of a metal such as resin or aluminum.

  At both ends of the roll holder 9a, guide rollers 80 formed with grooves that engage with the horizontal upper end surfaces 70U of the plate frames 70L and 70R are rotatably supported. When the paper feed roll 9 is set at a predetermined position, the paper feed roll 9 is lifted using the dedicated hook 100 and the guide roller 80 is engaged with the horizontal upper end face 70U. At this time, if the guide roller 80 is placed in a recess 70a formed in the horizontal upper end surface 70U at a position away from the control system storage unit 7, the paper feed roll 9 will not move carelessly. Work can be performed smoothly.

  Then, after the guide roller 80 and the horizontal upper end face 70U of the plate frames 70L and 70R are engaged, it is only necessary to push the paper feed roll 9 horizontally in the transport direction, that is, so as to approach the control system storage unit 7. The paper feed roll 9 can be stored in a predetermined position. Specifically, since the guide roller 80 attached to the roll holder 9a via the rotation shaft 86 is pivotally supported with respect to the roll holder 9a, when the paper feed roll 9 is pushed in the horizontal direction, The sheet feeding roll 9 can be moved in the horizontal direction by rolling the guide roller 80 without rotating the roll holder 9a. Thereby, for example, compared with a method in which the paper feed roll 9 is lifted by the dedicated hook 100 and moved to a predetermined position, the labor for setting the paper feed roll 9 can be greatly reduced.

  Then, when the paper feed roll 9 is moved in the horizontal direction by rolling the guide roller 80, the upper end surfaces of the plate frames 70L and 70R have a downhill shape when the predetermined position of the paper feed roll 9 approaches. It becomes. Here, when the guide roller 80 approaches a downhill, the engagement state between the guide roller 80 and the plate-like frames 70L and 70R is released, and the holding of the roll holder 9a by a total of four holding rolls 73 is switched. As a result, the paper feed roll 9 is placed in a predetermined position. At the same time, the driven gear 78 of the roll holder 9a meshes with the drive gear 81, and the regulation disk 79 of the roll holder 9a and the regulation plate 71 of the moving plate 89 are engaged.

  FIG. 13 is a view in the K direction of FIG. FIG. 14 is a view in the K direction of FIG. 8 in a state where the paper feed roll 9 is in a predetermined position. FIG. 13 shows a state in which the guide rollers 80 are engaged with the horizontal upper end surfaces 70U of the plate frames 70L and 70R. In this state, the paper feed roll 9 can be moved in the horizontal direction so as to be pulled by the dedicated hook 100 and can be stored in a predetermined position, but the work can also be performed with the dedicated hook 100 removed. The plate-like arm 102 of the dedicated hook 100 is set to have a size slightly larger than the width of the paper feed roll 9 in order to lift the paper feed roll 9 stably.

  While the guide roller 80 is engaged with the horizontal upper end surface 70U (see FIG. 13), the roll holder 9a and the holding roll 73 are not in contact with each other. The two holding rolls 73 on one side are disposed in the horizontal direction at intervals shorter than the diameter of the roll holder 9a, and at the same time the engagement between the guide roller 80 and the horizontal upper end surface 70U is released, the lower surface of the roll holder 9a. When the two holding rollers 73 come into contact with each other, the roll holder 9a is held at a predetermined position. When removing the paper feed roll 9 from a predetermined position, the paper feed roll 9 may be lifted upward using the dedicated hook 100. Further, the attachment / detachment portion of the paper discharge roll 10 can also have the same structure as the paper supply side.

  The structure of the heater and the heater driving device, the structure of each part in the transport path of the roll paper, the structure of the print head unit and the type of ink, the attachment / detachment mechanism of the paper feed roll and the paper discharge roll, etc. are not limited to the above embodiment, Various changes are possible. For example, a solenoid may be used instead of various motors for the actuator that drives the heater. Further, the ink used for printing is not limited to four colors, and multicolor inks including white can also be used.

  DESCRIPTION OF SYMBOLS 1 ... Inkjet printer (printer), 2 ... Print head storage part, 3 ... Fixing part, 5 ... Paper feed part, 6 ... Paper discharge part, 7 ... Control system storage part, 9 ... Paper feed roll, 9a ... Roll holder, DESCRIPTION OF SYMBOLS 10 ... Paper discharge roll, 10a ... Roll holder, 11 ... Roll paper, 14 ... Dancer roll, 16 ... Print head unit, 17 ... Ultraviolet irradiation device, 30 ... Heater, 31 ... Free roller, 33 ... Heater return spring, 39 ... Motor (actuator), 61a ... first guide roller, 61b ... second guide roller, 70a ... concave, 70L, 70R ... plate frame, 70U ... horizontal upper end surface, 71 ... regulator plate, 72, 77 ... fixed plate, 73 ... Holding roller (support member), 80 ... Guide roller, 89 ... Moving plate

Claims (5)

Inkjet printer having a line-type print head unit (16) that uses the roll paper (11) as a print medium and performs printing while maintaining a predetermined position with respect to the roll paper (11) conveyed on the conveyance path. In (1),
A heater (30) for heating the roll paper (11) is provided at a position upstream of a predetermined position of the print head unit (16) in the conveyance path of the roll paper (11) ,
The heater (30) is a plate-like member that is in surface contact with the roll paper (11),
The heater (30) contacts the back side with respect to the printing surface of the roll paper (11),
A first guide roller (61a) that freely rotates at a predetermined position and guides the roll paper (11) downward and downstream, and the roll paper (11) guided downward by the first guide roller (61a) And a dancer roll (14) that freely moves up and down to adjust the tension of the roll paper (11), and freely rotates at a predetermined position and moves upward by the dancer roll (14). A second guide roller (61b) for guiding the guided roll paper (11) in another direction,
The heater (30) is disposed at a position downstream of the dancer roll (14) and upstream of the second guide roller (61b),
When the second roller (61b) and the dancer roll (14) are viewed from the side, the roll paper (11) that generates tension between the second roller (61b) and the dancer roll (14) is closer to the vertical direction. In order to incline at an angle, it is arranged with a large amount of horizontal offset,
The heater (30) is formed with a convex curved surface toward the roll paper (11) in a side view,
The heater (30) abuts perpendicularly to the roll paper (11), and its curved surface contacts the roll paper (11) at an intermediate position between the second roller (61b) and the dancer roll (14). An ink jet printer, wherein the ink jet printer is disposed so as to abut . 2. The apparatus according to claim 1 , further comprising a plurality of free rollers (31) disposed at positions facing the heater (30) and pressing the roll paper (11) against the heater (30). Inkjet printer. The heater (30) is configured to be arbitrarily movable between a first position contacting the roll paper (11) and a second position spaced apart from the roll paper. The inkjet printer according to claim 1 or 2 . The inkjet printer according to claim 3 , wherein the heater (30) is configured to be movable between the first position and the second position by a driving force of an actuator (39). . The print head unit (16) is supplied with UV ink that is cured by irradiating with ultraviolet rays,
An ultraviolet irradiation device (17) for irradiating the ultraviolet rays is disposed at a position downstream of the transport path of the roll paper (11) with respect to the arrangement position of the print head unit (16). An ink jet printer according to any one of claims 1 to 4 .