JP2015174360A - printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce paper float of printing paper to be conveyed.SOLUTION: A printer 10 includes: an ink jet head 42 for discharging ink drop to printing paper P; a paper conveyance mechanism 30 which has a paper feed roller 36 and a paper pressure roller 37 pressed by the paper feed roller 36, holds the printing paper P between the paper feed roller 36 and the paper pressure roller 37 and conveys the printing paper P along a conveyance path 32; and a suction mechanism 50 which has a suction surface 52 including a platen 45 facing the ink jet head 42 via the conveyance path 32 and sucks the printing paper P toward the suction surface 52 side. The paper conveyance mechanism 30 is disposed in a suction range of the suction surface 52. The paper feed roller 36 has a plurality of recesses 31 formed in an axial direction on a circular outer peripheral surface. The suction surface 52 has a projection section 43 entering a recess region of the paper feed roller 36.

Description

  The present invention relates to a suction mechanism that sucks print paper and a printing apparatus that includes a paper transport mechanism that transports print paper.

  Printing apparatuses that print information on a long printing sheet are used in various fields. In recent years, there has been a demand for finer printing and color printing, and an ink jet printing apparatus including an ink jet head that ejects ink droplets is used. Ink jet printing apparatuses need to maintain a constant gap between the printing surface of the printing paper transported and the ink jet head in order to ensure good printing. In order to ensure the flatness of the printing surface of the printing paper, a printing apparatus having a suction mechanism for sucking the printing paper to the platen side facing the inkjet head has been proposed (for example, see Patent Document 1).

  Further, the printing apparatus includes a main driving roller that rotates by obtaining a driving force and a driven roller that is pressed against the main driving roller with a predetermined pressure, and the printing paper is sandwiched and conveyed between the main driving roller and the driven roller. A paper transport mechanism is known. In an ink jet printing apparatus, it takes time to absorb or dry ink droplets ejected onto a printing paper. For this reason, the ink droplets ejected onto the printing paper may adhere to the surface of the main driving roller or the driven roller, and then transferred to the printing paper, thereby degrading the printing quality. In order to prevent such a decrease in print quality, a so-called push-type paper transport mechanism is proposed in which the paper transport mechanism is provided on the upstream side in the transport direction with respect to the position where the inkjet head and the platen are arranged. (For example, refer to Patent Document 2).

JP 2010-201683 A JP 2009-023175

  In recent years, the fields in which printing apparatuses are used have expanded, and the types of printing paper have been varied. Printing paper includes standard-size single-cut paper, ticket paper (fanfold paper) that is perforated at predetermined intervals on long printing paper, and long printing. The roll paper etc. which rolled up the paper in roll shape are used. In the layout of each mechanism of the printing apparatus, when the suction mechanism and the paper transport mechanism are arranged on the paper transport path, a gap may be generated between the suction mechanism and the paper transport mechanism.

  When the printing paper described above is transported by a printing apparatus including a suction mechanism and a paper transport mechanism, the print paper is sucked to the paper transport surface side by the suction mechanism, so that the leading end portion of the print paper has a suction mechanism and a paper transport mechanism. There is a risk of getting caught in the gap between the two. For this reason, the conveyance of the printing paper becomes unstable, and if it is remarkable, paper jam occurs.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  (Application Example 1) An inkjet head that ejects ink droplets onto a printing paper, a main driving roller, and a driven roller that is pressed by the main driving roller. The printing paper is sandwiched between the main driving roller and the driven roller. A paper transport mechanism that transports along the transport path; and a suction mechanism that includes a suction surface including a platen that faces the inkjet head via the transport path, and sucks the printing paper toward the suction surface. The paper transport mechanism is disposed within the suction range of the suction surface, and the main driving roller has a plurality of concave portions along the axial direction on the outer peripheral surface, and the suction surface is the concave portion of the main driving roller. A printing apparatus having a protrusion that enters the concave area of the printing apparatus.

  According to this configuration, the printing paper on which information is printed is transported while being sucked to the suction surface by the main driving roller and the driven roller of the paper transport mechanism provided within the suction range of the suction surface of the suction mechanism. A plurality of concave portions are formed on the outer peripheral surface of the main driving roller, and a protruding portion formed on the suction surface enters the concave region. Therefore, the gap between the suction mechanism and the paper transport mechanism can be filled with a recess and a protrusion that enters the recess area. As a result, even when the printing paper is conveyed while being sucked by the suction surface, it is possible to reduce the end of the printing paper from being caught in or entering the gap between the suction mechanism and the paper conveying mechanism. Therefore, the printing paper can be stably conveyed while ensuring a gap between the printing paper and the inkjet head, and a printing apparatus with high printing quality and improved reliability can be provided.

  (Application example 2) The above-described printing apparatus, wherein the main driving roller includes a plurality of divided rollers arranged in an axial direction.

  According to this configuration, the concave portions of the main driving roller are easily formed by arranging the plurality of divided rollers in the axial direction.

  (Application Example 3) The division roller is arranged at least at a position where both ends of the printing paper that is supposed to be used pass in a plan view of the printing paper to be conveyed. Printing device.

  According to this configuration, the leading edge corner portion of the printing paper that is easily caught in the gap between the paper transport mechanism and the suction mechanism can be disposed on the outer peripheral surface of the split roller. Therefore, it is possible to reduce the end of the printing paper from being caught in or entering the gap between the suction mechanism and the paper transport mechanism.

  (Application Example 4) The suction surface is arranged at a position one step lower than the circular outer peripheral surface of the divided roller in a cross-sectional view of the transported printing paper, and the protrusion of the suction surface is formed by the main driving roller. Provided on the upstream side and / or the downstream side in the paper transport direction, and the protruding portion of the suction surface is formed with an inclined surface that rises from the suction surface toward the circular outer peripheral surface direction of the split roller in the cross-sectional view. The printing apparatus as described above.

  According to this configuration, the conveyed printing paper advances along the inclined surface formed at the protruding portion of the suction surface. Therefore, even if there is a step between the suction surface and the circular outer peripheral surface of the main driving roller (dividing roller) in transporting the printing paper, the influence of the step can be reduced. As a result, it is possible to reduce the catching or entering of the printing paper into the gap between the suction mechanism and the paper transport mechanism. Therefore, it is possible to provide a printing apparatus that can stably convey printing paper and has high print quality and improved reliability.

  (Application Example 5) The suction surface is arranged at a position one step lower than the circular outer peripheral surface of the main driving roller in a cross-sectional view of the transported printing paper, and the protruding portion of the suction surface is arranged on the main driving roller. Provided on the upstream side and the downstream side in the paper conveyance direction, the projecting portion of the suction surface is formed with an inclined surface rising from the suction surface toward the circular outer peripheral surface direction of the main driving roller in the cross-sectional view, The above-described printing apparatus, wherein the top portions of the two inclined surfaces each extend in a thin plate shape and are coupled at a position lower than the circular outer peripheral surface of the main driving roller.

  According to this configuration, the conveyed printing paper advances along the inclined surface formed at the protruding portion of the suction surface and the thin plate portion extending from the inclined surface. Therefore, even if there is a step between the suction surface and the circular outer peripheral surface of the main driving roller (dividing roller), the printing paper is smoothly transported with the effect of the step being reduced. As a result, it is possible to reduce the catching or entering of the printing paper into the gap between the suction mechanism and the paper transport mechanism. Therefore, it is possible to provide a printing apparatus that can stably convey printing paper and has high print quality and improved reliability.

FIG. 2 is a schematic cross-sectional view showing the overall configuration of the printing apparatus. The figure which shows the example of printing paper. The disassembled perspective view of a suction mechanism. The figure explaining the relationship between the suction mechanism and paper conveyance mechanism which concern on 1st Embodiment. The figure explaining the relationship between the suction mechanism which concerns on 2nd Embodiment, and a paper conveyance mechanism. The figure explaining the relationship between the suction mechanism and paper conveyance mechanism which concern on 3rd Embodiment.

  Hereinafter, the present embodiment will be described with reference to the drawings. In the drawings referred to in the following description, the vertical and horizontal scales of members or parts may be shown differently from the actual ones for convenience of description and illustration.

(About the overall configuration of the printing device)
First, the overall configuration of the printing apparatus will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic cross-sectional view showing the overall configuration of the printing apparatus, and FIG. 2 is a diagram showing an example of printing paper. Hereinafter, as an example of a printing apparatus, a long printing paper is fed from the back of the printing apparatus, ink droplets are ejected from an inkjet head, information is printed, and the ink jet is ejected forward. To do. In addition, instead of long printing paper, A4 size sheet paper can also be used. The X direction shown in FIG. 1 indicates the conveyance direction of the printing paper in the printing mechanism portion, the Y direction indicates the width direction of the printing paper, and the Z direction indicates a direction orthogonal to the X direction and the Y direction.

  As illustrated in FIG. 1, the printing apparatus 10 includes a printing paper storage unit 20, a paper transport mechanism 30, a printing mechanism 40, a suction mechanism 50, a housing 12 that includes these, and a control unit 15. . The printing apparatus 10 according to the present embodiment forms perforations 17 at predetermined intervals on a roll paper R obtained by winding a long print paper P in a roll shape, and the same long print paper P, and is folded alternately. The fanfold paper F and the standard size cut sheet P1 can be selectively used.

  First, an example of the printing paper P will be described. As shown in FIG. 2A, the fanfold paper F is configured such that a long print paper P can be cut by being provided with perforations 17 at predetermined intervals in the longitudinal direction, and alternately reverse in the perforation 17 sites. Are folded and laminated. Further, on the printing paper P, sprocket holes 19 with which a tractor pin 26 (see FIG. 1) of the tractor 25 of the paper transport mechanism 30 to be described later can be engaged with both side edges 18a and 18b along the longitudinal direction at a predetermined pitch. It is formed in a row. Such fanfold paper F is often used when issuing tickets, labels, and the like continuously.

  As shown in FIG. 2B, the roll paper R is formed by winding a long print paper P having a predetermined width in a roll shape around the paper tube Ra. In recent years, for the purpose of reducing the frequency of replacement of roll paper R, roll paper R rolled up to a large diameter or roll paper R using printing paper P with a thin paper thickness is used. Further, as shown in FIG. 2C, a single-size sheet P1 of a standard size such as A4 can be used as the printing paper P, for example.

  As shown in FIG. 1, a printing paper storage unit 20 according to this embodiment includes a roll paper storage unit 22 for roll paper R obtained by winding a long printing paper P in a roll shape, and a long printing paper. The fanfold paper storage unit 24 for the fanfold paper F is formed with perforations formed at predetermined intervals with respect to P and alternately folded. The roll paper storage unit 22 is disposed on the inner rear side in the X direction of the printing apparatus 10 and has a roll paper drive shaft 23. The roll paper drive shaft 23 supports the paper tube Ra at the center of the roll paper R, and obtains a driving force from a roll paper shaft drive motor (not shown) to rotate the roll paper R in the forward and reverse directions. The fanfold paper storage unit 24 is disposed outside the casing 12 at the rear of the printing apparatus 10 in the X direction, and stores the folded fanfold paper F.

  Note that the printing paper storage unit 20 uses either the roll paper storage unit 22 or the fanfold paper storage unit 24 depending on the intended use of the printing apparatus 10, that is, whether the roll paper R or the fanfold paper F is used. Can be used or fixed. When using the cut sheet P1, a paper tray (not shown) may be prepared as the printing paper storage unit 20. Hereinafter, a case where the roll paper R is used and the roll paper storage unit 22 is used will be described as an example.

  The paper transport mechanism 30 includes a feed roller 33, a guide roller 34, and a paper feed roller pair 35 in order from the upstream in the transport direction (X direction) of the transport path 32 from the rear to the front of the printing apparatus 10. The feed roller 33 feeds the printing paper P sent out from the roll paper storage unit 22 by driving the roll paper drive shaft 23 to the transport path 32 by obtaining a driving force from a feed roller drive motor (not shown). The guide roller 34 is provided on the downstream side of the feeding roller 33 and guides the printing paper P while applying an appropriate tension to the printing paper P.

  The paper feed roller pair 35 includes a paper feed roller 36 as a main driving roller and a paper presser roller 37 as a driven roller. The paper feed roller 36 is disposed on the lower side of the transport path 32 in the Z direction, and obtains a driving force from a paper transport motor (not shown) and rotates at an arbitrary speed in the forward and reverse directions. The paper pressing roller 37 has a cylindrical shape and is rotatable, and is pressed against the paper feeding roller 36 with a predetermined pressure across the conveyance path 32. Details of the paper feed roller 36 as the main driving roller will be described later.

  The paper feed roller pair 35 holds the print paper P between the paper feed roller 36 and the paper presser roller 37, and follows the rotation path of the paper feed roller 36 along the transport path 32 with the print paper P at a predetermined speed and pitch. Transport. The conveyed printing paper P is discharged from a paper discharge port 13 provided in the front of the casing 12 of the printing apparatus 10 in the X direction via a printing mechanism 40 and a suction mechanism 50 described later. A paper guide 38 is provided between the components of the paper transport mechanism 30 to guide the transport of the printing paper P. The paper guide 38 regulates the width direction and transport position of the print paper P, and is not limited to the width dimension of the print paper P. It has a function to regulate the arrangement.

  Here, a case where the fanfold paper storage unit 24 is used using the fanfold-shaped printing paper P will also be described. When the paper transport mechanism 30 transports the fanfold-shaped printing paper P, a pair provided in the vicinity of the paper supply port 14 provided at the rear portion in the X direction of the printing apparatus 10 instead of the feeding roller 33 described above. The tractor 25 is used. The tractor 25 is bridged with a tractor pin (engagement portion) 26 that can be inserted into the sprocket hole 19 of the printing paper P, a tractor belt 27 having tractor pins 26 formed on the outer peripheral surface at predetermined intervals, and a tractor belt 27. The drive sprocket 28 and the driven sprocket 29 are provided.

  The pair of tractors 25 are arranged on both sides in the Y direction of the transport path 32 so as to correspond to the sprocket holes 19 at both ends in the width direction of the transported printing paper P. Each of the drive sprockets 28 of the pair of tractors 25 is connected by a drive sprocket shaft (not shown) so that the pair of tractors 25 are driven in synchronization. The pair of tractors 25 introduces the fanfold-shaped printing paper P stored in the fanfold paper storage unit 24 from the paper supply port 14 and sends it to the transport path 32 described above. In this case, the guide roller 34 may or may not be used.

An encoder (not shown) may be disposed on the paper feed roller 36 and the feed roller 33 or the tractor 25. The transport speed and transport distance of the printing paper P can be detected using the detection values of these encoders. In addition, a transmissive or reflective optical sensor may be provided on the paper guide 38 in the transport path 32 to detect the presence of the printing paper P and the leading edge position.
The paper transport mechanism 30 described above is disposed on the upstream side in the transport direction along the transport path 32 with respect to an inkjet head 42 of the printing mechanism 40 described later. Such a paper transport mechanism 30 is referred to as a so-called push type paper transport mechanism 30.

  The printing mechanism 40 includes an inkjet head 42, a carriage 44, and a platen 45. The inkjet head 42 has a plurality of nozzles (not shown) that discharge ink supplied by an ink supply mechanism (not shown) as ink droplets, and the nozzles are directed downward in the Z direction, that is, toward the conveyance path 32 where the printing paper P is conveyed. Are mounted on the carriage 44. The platen 45 has a role of defining a printing position, and is disposed at a position facing the inkjet head 42 with the conveyance path 32 interposed therebetween.

  The printing apparatus 10 may adopt a so-called serial printing method in which the inkjet head 42 and a carriage 44 on which the inkjet head 42 is mounted are reciprocated in the width direction of the printing paper P by a carriage feed mechanism (not shown). Further, the printing apparatus 10 may adopt a so-called line printing method in which a plurality of inkjet heads 42 are mounted on the carriage 44 so as to cover the printing area in the Y direction of the printing paper P.

  The suction mechanism 50 is disposed in the conveyance path 32 including the platen 45 facing the printing mechanism 40, and keeps a constant gap between the printing paper P being conveyed and the inkjet head 42 in order to ensure good print quality. Have a role. Details of the suction mechanism 50 will be described later. The control unit 15 comprehensively controls each of the mechanisms described above.

  The printing apparatus 10 having the above-described configuration feeds a long printing paper P in the form of a roll paper R or a fanfold paper F from the rear of the printing apparatus 10 in the X direction, and transports it by the paper transport mechanism 30. Ink droplets are selectively ejected from the inkjet head 42 of the printing mechanism 40 to print desired information and issued from the paper discharge port 13 located on the front side. In the case of roll paper R, it is cut into a desired length by an auto cutter 48 provided at the paper discharge port 13 and issued as a single sheet. In the case of the fanfold paper F, a paper discharge tray (not shown) is provided downstream of the paper discharge port 13, and is temporarily stored in a folded state, and then taken out together, and is subjected to processing such as issuance in a later process. The

(About suction mechanism and paper transport mechanism)
(First embodiment)
Here, the relationship between the suction mechanism and the paper transport mechanism according to the first embodiment will be described with reference to FIGS. FIG. 3 is an exploded perspective view of the suction mechanism, and FIG. 4 is a view for explaining the relationship between the suction mechanism and the paper transport mechanism according to the first embodiment. The X direction, the Y direction, and the Z direction shown in FIGS. 3 and 4 indicate the same directions as the X direction, the Y direction, and the Z direction shown in FIG.

  As shown in FIG. 3, the suction mechanism 50 includes a suction unit 60 and a drive unit 65 in order from the lower side in the Z direction with the suction unit 55 forming a part of the transport path 32 of the paper transport mechanism 30 as an upper part. .

  The suction unit 55 includes a substantially rectangular suction surface 52 and an opening / closing operation unit 56. The suction surface 52 includes the platen 45 portion described above, and one irregularly shaped square hole 51 and a large number of suction holes 53 are formed as openings. As shown in FIGS. 3 and 4, the irregularly shaped square hole 51 has a long side portion arranged in the Y direction and is arranged on the upstream side in the transport direction (X direction) with respect to the platen 45 portion. The square hole 51 has a rectangular-shaped protrusion 43 that protrudes toward the X-direction center side of the square hole 51 on each of the two long side portions, and a plurality of the protrusions 43 are formed at predetermined intervals in the Y direction. It has a so-called comb tooth shape. However, the protruding portion 43 is not provided at a position where the end portions in the width direction of the plurality of printing papers P to be used pass.

  The suction holes 53 are formed as through holes penetrating the suction surface 52, and are arranged in a substantially matrix shape on the surface of the suction surface 52 excluding the square hole 51 portion. On the upstream side and downstream side of the suction surface 52 in the conveyance direction (X direction) of the printing paper P, paper detection units 54a and 54b that detect the leading edge position of the printing paper P and the presence or absence of the printing paper P are provided.

  The opening / closing operation unit 56 controls the opening / closing operation of a large number of suction holes 53 formed in the suction surface 52, and includes an opening / closing plate (not shown), a first cam group 57, and a second cam group 58. The opening / closing plate is formed in a substantially rectangular plate shape with a through hole (not shown) corresponding to the suction hole 53, and is slidably disposed on the back surface side of the suction surface 52. The first cam group 57 and the second cam group 58 are configured by a plurality of cams and gears connected to the opening / closing plate, and slide-drive the opening / closing plate along the back surface of the suction surface 52.

  In the suction unit 55 according to the first embodiment, the paper feed roller pair 35 of the paper transport mechanism 30 described above is disposed in the square hole 51 portion in a direction in which the rotation axis extends in the Y direction. As shown in FIG. 4, the paper feed roller 36, which is a main driving roller, is composed of a plurality of divided rollers 39 arranged at predetermined intervals in the axial direction of the paper feed roller shaft 36a. Therefore, a space between one divided roller 39 and the adjacent divided roller 39 forms a so-called recess 31.

  Moreover, the square hole 51 has the protrusion part 43 which protrudes in the X direction center side of the square hole 51 at two long side parts, respectively. Therefore, the paper feed roller 36 and the square hole 51 are arranged such that the protruding portion 43 enters the recessed area of the recessed portion 31. At this time, the paper feed roller 36 is disposed on the lower side in the Z direction with respect to the suction surface 52, and is attached so that a part of the outer peripheral surface of the dividing roller 39 is exposed from the surface of the suction surface 52. The paper feed roller 36 obtains a driving force from a paper transport motor (not shown) and rotates at an arbitrary speed in the forward and reverse directions. The paper pressing roller 37 is rotatably arranged on the upper side in the Z direction with the conveyance path 32 interposed therebetween, and is pressed by a plurality of division rollers 39 of the paper feeding roller 36 with a predetermined pressure.

  The suction unit 60 includes a suction chamber 62 and a suction fan 64. The suction chamber 62 has a substantially box shape in which the upper surface in the Z direction in the figure is open, and the above-described suction unit 55 is attached to the open upper part in a lid shape. The suction fan 64 is rotatably attached to one side surface of the suction chamber 62.

  The drive unit 65 includes a first motor 67 and a second motor 68 and is attached to the inside of the suction chamber 62 from the bottom surface side of the suction chamber 62. The first motor 67 is connected to the first cam group 57 or the second cam group 58 of the opening / closing operation unit 56 of the suction unit 55, and drives the first cam group 57 and the second cam group 58. The second motor 68 is connected to the suction fan 64 and rotationally drives the suction fan 64.

  In the printing apparatus 10 having the above-described structure, when the printing paper P transported by the feeding roller 33 or the tractor 25 of the paper transport mechanism 30 reaches the suction surface 52 of the suction mechanism 50, the paper positioned on the upstream side of the suction surface 52. The detection unit 54a detects the leading edge of the printing paper P. Next, the leading edge of the printing paper P is sandwiched between the paper feed roller 36 of the paper transport mechanism 30, specifically the split roller 39 and the paper pressing roller 37, and is transported along the suction surface 52.

  The suction mechanism 50 uses the detection signal of the paper detection unit 54a as a trigger to drive the first motor 67 of the drive unit 65 to slide the opening / closing plate of the opening / closing operation unit 56 to open the suction hole 53 of the suction surface 52. At the same time, the second motor 68 of the drive unit 65 is driven to rotate the suction fan 64 of the suction unit 60. Due to the rotation of the suction fan 64, the inside of the suction chamber 62 is in a negative pressure state, and a suction force is generated in each suction hole 53 of the suction surface 52. Therefore, the printing paper P is sucked toward the suction surface 52 of the suction mechanism 50, that is, the platen 45, and conveyed while being in close contact with the suction surface 52.

Hereinafter, effects of the first embodiment will be described.
(1) The printing paper P on which information is printed is sucked to the suction surface 52 by the paper feed roller 36 and the paper pressing roller 37 of the paper transport mechanism 30 provided within the suction range of the suction surface 52 of the suction mechanism 50. While being transported. In the paper feed roller 36, a plurality of concave portions 31 are formed on the outer peripheral surface by a plurality of divided rollers 39, and a protruding portion 43 formed on the suction surface 52 enters the concave region. For this reason, a gap between the suction surface 52 of the suction mechanism 50 and the paper feed roller 36 of the paper transport mechanism 30 is filled with the concave portion 31 and the protruding portion 43 that enters the concave region. As a result, even when the printing paper P is conveyed while being sucked by the suction surface 52, the end of the printing paper P is reduced from being caught in the gap between the suction surface 52 and the paper feed roller 36 or entering the gap. it can. Therefore, the printing paper P can be stably conveyed while ensuring a gap between the printing paper P and the inkjet head 42, and the printing apparatus 10 with high print quality and improved reliability can be provided.

  (2) In the square hole 51 provided in the suction surface 52, the protruding portion 43 is provided so as to avoid the position where the end portions in the width direction of the plurality of printing papers P that are supposed to be used pass. That is, the leading edge portion and the widthwise end portion of the printing paper P pass through the outer peripheral surface of the dividing roller 39. For this reason, it is possible to prevent the edge of the printing paper P from being caught or bent, which may occur when the widthwise end of the printing paper P passes through the recess 31, and the printing paper P can be stably conveyed.

(Second Embodiment)
Here, the relationship between the suction mechanism and the paper transport mechanism according to the second embodiment will be described with reference to FIG. FIG. 5 is a diagram for explaining the relationship between the suction mechanism and the paper transport mechanism according to the second embodiment, and more specifically, a cross-sectional view seen from the Y direction in the figure. The X direction, Y direction, and Z direction shown in FIG. 5 indicate the same directions as the X direction, Y direction, and Z direction shown in FIG. In addition, about the structure and content similar to 1st Embodiment, a code | symbol is made equal and description is abbreviate | omitted.

  As shown in FIG. 5, the suction surface 52 of the suction mechanism 50 of the printing apparatus 10 falls one step in the Z direction from the circular outer peripheral surface of the paper feed roller 36 (dividing roller 39) in a cross-sectional view of the printing paper P being conveyed. It is arranged at the position. And the protrusion part 43 provided in the suction surface 52 forms the inclined surface 43a which stands | starts up toward the circular outer peripheral surface direction of the division | segmentation roller 39 in the cross sectional view similarly. The inclined surface 43a may be formed on both the upstream side and the downstream side in the paper conveyance direction, or may be formed only on the downstream side. In any case, the printing paper P transported along the transport path 32 is along the circular outer peripheral surface of the paper feed roller 36 (dividing roller 39) and the inclined surface 43a formed on the protrusion 43 of the suction surface 52. Go ahead.

  Therefore, even if there is a step between the suction surface 52 and the circular outer peripheral surface of the paper feed roller 36 (dividing roller 39) in transporting the printing paper P, the effect of the step can be reduced. As a result, it is possible to reduce the catching or entering of the printing paper P into the gap between the suction surface 52 of the suction mechanism 50 and the paper feed roller 36 of the paper transport mechanism 30. Therefore, it is possible to provide the printing apparatus 10 that can stably convey the printing paper P, has good printing quality, and has improved reliability.

(Third embodiment)
Next, the relationship between the suction mechanism and the paper transport mechanism according to the third embodiment will be described with reference to FIG. FIG. 6 is a diagram for explaining the relationship between the suction mechanism and the paper transport mechanism according to the third embodiment, and more specifically, a cross-sectional view seen from the Y direction in the figure. The X direction, Y direction, and Z direction shown in FIG. 6 are the same directions as the X direction, Y direction, and Z direction shown in FIG. In addition, about the structure and content similar to 1st Embodiment and 2nd Embodiment, a code | symbol is made equal and description is abbreviate | omitted.

  As shown in FIG. 6, the suction surface 52 of the suction mechanism 50 of the printing apparatus 10 falls one step in the Z direction from the circular outer peripheral surface of the paper feed roller 36 (dividing roller 39) in the cross-sectional view of the printing paper P being conveyed. It is arranged at the position. The protrusions 43 provided on the upstream side and the downstream side in the paper conveyance direction provided on the suction surface 52 are formed with an inclined surface 43a that rises from the suction surface 52 toward the circular outer peripheral surface of the dividing roller 39 in the same sectional view. Yes.

  The top portions of the two inclined surfaces 43a each extend in a thin plate shape and are coupled at a position lower in the Z direction than the circular outer peripheral surface of the paper feed roller 36 (dividing roller 39) to form a bridge 43b shape. Therefore, the printing paper P transported along the transport path 32 is along the circular outer peripheral surface of the paper feed roller 36 (dividing roller 39), the inclined surface 43a formed on the protrusion 43 of the suction surface 52, and the bridge 43b. move on.

  Therefore, even if there is a step between the suction surface 52 and the circular outer peripheral surface of the paper feed roller 36 (dividing roller 39) in transporting the printing paper P, the effect of the step can be reduced. As a result, it is possible to reduce the catching or entering of the printing paper P into the gap between the suction surface 52 of the suction mechanism 50 and the paper feed roller 36 of the paper transport mechanism 30. Therefore, it is possible to provide the printing apparatus 10 that can stably convey the printing paper P, has good printing quality, and has improved reliability.

  As mentioned above, although embodiment of this invention was described, various deformation | transformation can be added with respect to the said embodiment in the range which does not deviate from the meaning of this invention. For example, modifications other than the above embodiment are as follows.

  In the above-described embodiment, the case where the rectangular protrusion 43 is employed as the protrusion 43 has been described, but the present invention is not limited thereto. Any shape that can enter the concave region of the concave portion 31 formed by the plurality of divided rollers 39 may be used. Moreover, although the case where the paper feed roller 36 is configured by a plurality of divided rollers 39 arranged at a predetermined interval has been described, the present invention is not limited thereto. The paper feed roller 36 may be formed in a cylindrical shape, and post-processing may be applied thereto to form the recess 31.

  DESCRIPTION OF SYMBOLS 10 ... Printing apparatus, 13 ... Paper discharge port, 20 ... Print paper storage part, 30 ... Paper conveyance mechanism, 31 ... Concave part, 32 ... Conveyance path, 35 ... Paper feed roller pair, 36 ... Paper feed roller, 36a ... Paper feed Roller shaft, 37 ... paper press roller, 39 ... split roller, 40 ... printing mechanism, 42 ... ink jet head, 43 ... projection, 43a ... inclined surface, 43b ... bridge, 45 ... platen, 50 ... suction mechanism, 51 ... corner Hole 52, suction surface, 53 ... suction hole, 55 ... suction unit, 56 ... opening and closing operation unit, 60 ... suction unit, 62 ... suction chamber, 64 ... suction fan, F ... fanfold paper, P ... printing paper, P1 ... cut sheet, R ... roll paper.

Claims (5)

An inkjet head that ejects ink droplets onto printing paper;
A paper conveyance mechanism having a main driving roller and a driven roller pressed against the main driving roller, and sandwiching the printing paper between the main driving roller and the driven roller and conveying the printing paper along a conveyance path;
A suction mechanism including a suction surface including a platen facing the inkjet head via the transport path, and a suction mechanism for sucking the printing paper toward the suction surface;
The paper transport mechanism is disposed within a suction range of the suction surface;
The main driving roller has a plurality of recesses along the axial direction on the outer peripheral surface,
The printing apparatus according to claim 1, wherein the suction surface has a protruding portion that enters a recessed area of the recessed portion of the main driving roller.   The printing apparatus according to claim 1, wherein the main driving roller includes a plurality of divided rollers arranged in an axial direction.   3. The printing according to claim 2, wherein the dividing roller is disposed at least at a position where both ends of the printing paper which is supposed to be used pass in a plan view of the printing paper to be transported. apparatus. The suction surface is disposed at a position one step lower than the circular outer peripheral surface of the divided roller in a cross-sectional view of the printing paper to be conveyed,
The protruding portion of the suction surface is provided on the upstream side and / or the downstream side in the paper transport direction of the main driving roller,
The inclined surface rising from the suction surface toward the circular outer peripheral surface direction of the divided roller is formed in the projecting portion of the suction surface in the cross-sectional view. A printing apparatus according to claim 1. The suction surface is disposed at a position one step lower than the circular outer peripheral surface of the main driving roller in a cross-sectional view of the printing paper to be conveyed,
The protrusions of the suction surface are provided on the upstream side and the downstream side in the paper transport direction of the main driving roller,
The projecting portion of the suction surface is formed with an inclined surface that rises from the suction surface toward the circular outer peripheral surface direction of the main driving roller in the cross-sectional view,
4. The top portions of the two inclined surfaces each extend in a thin plate shape and are coupled at a position lower than the circular outer peripheral surface of the main driving roller. 5. Printing device.

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