JP2014170031A - Paper removal mechanism and printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily handle troubles such as paper jams.SOLUTION: A paper removal mechanism 60 of a printer 10 comprises a paper reversal mechanism 45 which conveys recording paper P and reverses the front and back sides of the paper. The paper reversal mechanism 45 comprises: a looped paper conveyance path 41; a plurality of paper feed roller pairs 46, 47 provided along the paper conveyance path 41; and a first paper guide part 52 guiding the front and back side direction of the recording paper P conveyed by the plurality of paper feed roller pairs 46, 47. The first paper guide part 52 includes: a first guide 54 guiding one side Pa of the recording paper P and positioned on an exterior case 12 side of the printer 10; and a second guide 53 guiding the other side Pb of the recording paper P. The first guide 54 is set to be releasable, includes the paper feed roller pair 46 positioned on the uppermost stream side in the paper conveyance direction of the paper conveyance path 41, and releases at least a part of the paper conveyance path 41 on the downstream side of the paper feed roller pair 46.

Description

  The present invention relates to a paper removal mechanism that removes recording paper from a paper conveyance path, and a printing apparatus including the paper removal mechanism.

  A printing apparatus that prints information on a recording paper includes a printing mechanism that prints information on the recording paper, and a paper that is delivered from a recording paper storage unit that stores the recording paper to a position of the printing mechanism and is issued from a paper discharge port. A transport mechanism. In this type of printing apparatus, for example, the recording paper may be bent due to a humidity environment or the like, and when the recording paper is conveyed, the leading end may be caught by a connection portion of the paper guide of the paper conveying mechanism. If the recording paper is transported with the leading edge of the recording paper being caught by the paper guide, the recording paper is jammed in the paper transport path.

  In order to cope with such troubles such as paper jam, a paper processing apparatus having a paper removal space for removing a jammed recording paper on a paper transport path has been proposed (for example, see Patent Document 1). When the recording paper is jammed in the paper conveyance path, the conveyance roller is manually rotated to move the recording paper to the paper removal space. Then, a hand is inserted into the paper removal space to remove the recording paper.

Japanese Patent Laid-Open No. 2003-300657

  In recent years, the amount of information printed on recording paper has increased, and high-density printing or double-sided printing may be performed. In particular, in double-sided printing, the paper conveyance path is complicated, and there are cases where a recording paper in a deformed state is conveyed due to distortion or the like caused by printing on one side. In particular, in an ink jet printing apparatus, printing is performed with ink droplets attached, so that the tendency is remarkable and the risk of paper jam increases.

  In the above-described paper processing apparatus, when the recording paper is jammed in the paper transport path, the recording paper may be deformed and the transport roller and the recording paper may not be in contact with each other. In such a case, it becomes difficult to move the recording paper by rotating the transport roller. Therefore, there is a problem that it is difficult to remove the jammed recording paper.

  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) A sheet removing mechanism of a printing apparatus including a sheet reversing mechanism that conveys a recording sheet and reverses the front and back, wherein the sheet reversing mechanism is arranged along a loop-shaped sheet conveying path and the sheet conveying path. A plurality of paper feed roller pairs, and a paper guide for guiding the front and back surfaces of the recording paper conveyed by the plurality of paper feed roller pairs, wherein the paper guide is one of the recording papers. A first guide positioned on the outer case side of the printing apparatus and a second guide for guiding the other surface, the first guide being set to be openable, and the paper transport path A paper removal mechanism comprising the pair of paper feed rollers located on the most upstream side in the paper conveyance direction of the paper and opening at least a part of the paper conveyance path on the downstream side.

  In the case of duplex printing, the printing apparatus performs printing on one side of the recording paper and conveys the recording paper in the reverse direction. Then, the recording sheet is carried into the sheet conveyance path of the sheet reversing mechanism. Since one side of the recording paper is printed, there is a high risk of deformation such as folding or distortion. Therefore, a failure due to deformation of the recording paper occurs in the vicinity of the introduction portion of the paper reversing mechanism, and there is a high possibility that a problem such as a paper jam will occur starting from the trouble. According to this configuration, the recording paper carried into the paper conveyance path of the paper reversing mechanism includes the paper feed roller pair that reaches first, and the part of the subsequent paper conveyance path can be opened. As a result, in the printing apparatus, it is possible to open a portion where there is a high possibility that a problem such as a paper jam will occur. Accordingly, the recording paper can be easily removed even if a problem relating to paper conveyance such as a paper jam occurs.

  (Application Example 2) The paper described above, wherein the paper feed roller pair positioned on the most upstream side in the paper transport direction of the paper transport path is disposed at a position to change the traveling direction of the recording paper. Removal mechanism.

  In the printing apparatus, there is a high possibility that a trouble such as a paper jam occurs from the vicinity of the introduction portion of the paper reversing mechanism, in particular, a position where the traveling direction of the recording paper is changed. According to this configuration, the paper conveyance roller pair that changes the traveling direction of the recording paper is included, and the subsequent paper conveyance path portion is opened. For this reason, the recording paper can be removed in a place where a paper conveyance defect such as a paper jam is likely to occur.

  (Application Example 3) The sheet removing mechanism described above, wherein the first guide is a case member constituting the exterior case.

  According to this configuration, the case member constituting the exterior case and the first guide for guiding the recording paper can be formed as an integral part. Therefore, the number of parts can be reduced, and the space saving can be realized by reducing the expansion in the outer direction of the printing apparatus.

  Application Example 4 The first guide and the second guide have plate-like ribs in a direction intersecting with the recording paper to be conveyed, and guide the recording paper at an end surface of the plate-like rib. The paper removal mechanism described above.

  According to this configuration, the recording sheet conveyed along the sheet conveyance path is guided by the end face of the plate-like rib. Therefore, contact resistance can be reduced and smooth paper conveyance can be realized. In the case of being formed integrally with the case member, the material reduction of the case member can be realized.

  (Application Example 5) The sheet removing mechanism described above, wherein the printing apparatus is an ink jet system that ejects ink as ink droplets.

  According to this configuration, the ink jet printing apparatus prints information by ejecting ink droplets onto a recording sheet. If the ink is not sufficiently dried, the recording paper becomes damp and the rigidity of the recording paper is lowered, and deformation such as bending or distortion is likely to occur. Therefore, there is a high possibility that problems such as a paper jam will occur. When this paper removal mechanism is applied to an ink jet printing apparatus, it is possible to open a place where there is a high possibility of occurrence of a problem such as a paper jam. As a result, even if a problem such as a paper jam occurs, the recording paper can be easily removed.

  Application Example 6 A printing mechanism that prints information on a recording sheet, a first sheet conveyance mechanism that conveys the recording sheet to the printing mechanism, and a recording sheet on which one side is printed by the printing mechanism A printing apparatus comprising: a paper reversing mechanism for reversing the surface; and the paper removing mechanism provided in a paper transport path of the paper reversing mechanism.

  According to this configuration, the printing apparatus can easily remove the recording paper even if a paper transport problem such as a paper jam occurs.

1 is an external perspective view of a printer as a printing apparatus according to an embodiment. FIG. 3 is a schematic cross-sectional view illustrating a cross-sectional configuration of the printer. FIG. 2 is an external perspective view of a printer including a paper removal mechanism.

  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. In this embodiment, an example of an inkjet printer that performs printing by ejecting ink droplets onto a recording sheet will be described as a printing apparatus. The ink jet printer according to the present embodiment is a printer that can, for example, feed A4 size recording paper from a recording paper storage unit, print information on both front and back sides of the recording paper, and issue the information from a paper discharge port.

(Overall configuration of inkjet printer)
First, the overall configuration of the ink jet printer will be described with reference to FIG. FIG. 1 is an external perspective view of a printer as a printing apparatus according to the present embodiment, in which (a) is an external perspective view as viewed from the paper discharge port side for discharging recording paper, that is, from the front, and (b) is It is the external appearance perspective view seen from the rear surface. The X direction shown in FIG. 1 indicates the discharge direction of the recording paper at the paper discharge port, the Y direction indicates the width direction of the recording paper, and the Z direction indicates a direction orthogonal to the X direction and the Y direction. .

  As shown in FIG. 1A, an ink jet printer (hereinafter referred to as a printer 10) has a printer mechanism unit 20 (see FIG. 2), which will be described later, of an outer case 12 composed of an upper case 13 and a lower case 14. House inside. A sheet discharge port 15 is opened on a surface 12 a extending in the Y direction and the Z direction in the figure of the outer case 12. The paper discharge port 15 is provided with a paper discharge tray 11 that holds the recording paper P (see FIG. 2) that has been printed. The paper discharge tray 11 is detachably attached to the outer case 12. In addition, a recording paper storage portion 22 that stores recording paper P to be printed in a stacked manner is disposed below the paper discharge tray 11 in the Z direction. The recording paper storage unit 22 is detachably attached to the printer mechanism unit 20.

  A display unit 17 including an LED lamp or the like that displays an operation state is provided at the upper part of the sheet discharge port 15 in the Z direction. On both sides of the paper discharge port 15 in the Y direction, cartridge storage portions (not shown) for storing ink cartridges (not shown) are respectively provided. The cartridge housing portion is covered with ink covers 18a and 18b that can be opened and closed. The ink cartridge can be replaced by opening the ink covers 18a and 18b.

  As shown in FIG. 1B, the rear surface side of the printer 10 accommodates a paper reversing mechanism 45 (see FIG. 2) in a paper transport mechanism 40 described later, and forms a part of the paper reversing mechanism 45. An opening / closing lid 19 as a member is provided. The open / close lid 19 is formed in a square shape, and is rotatable in the arrow A direction with the vicinity of the lower side in the Z direction in the figure as the rotation center. Details of the opening / closing lid 19 will be described later.

(About the structure of the printer mechanism)
Next, the configuration of the printer mechanism unit housed in the exterior case will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view showing a cross-sectional configuration of the printer. Note that the X direction, Y direction, and Z direction shown in FIG. 2 are the same as the X direction, Y direction, and Z direction shown in FIG.

  As shown in FIG. 2, the printer mechanism unit 20 includes the above-described recording paper storage unit 22, a paper transport mechanism 40, a printing mechanism 30, and a control unit (not shown). The paper transport mechanism 40 includes a first paper transport mechanism 25 and a paper reversing mechanism 45.

(For single-sided printing)
The printer 10 of the present embodiment is a printer that can print on both front and back sides of a recording sheet P of A4 size or the like, for example. First, a case where information is printed on one surface Pa of the recording paper P using the first paper transport mechanism 25 and the printing mechanism 30 will be described.

  As shown in FIG. 2, the first paper transport mechanism 25 is configured to record the recording paper along the first paper transport path 21 indicated by a one-dot chain line in the curved diagram starting from the recording paper storage portion 22 and ending at the paper discharge port 15. Transport P. The first paper transport mechanism 25 includes a recording paper feed mechanism 23, a first paper feed roller pair 28, and two second paper feed roller pairs 29 in order along the first paper transport path 21. The recording paper feeding mechanism 23 includes an arc-shaped feeding roller 24 having a part of a flat surface on the outer periphery. The feeding roller 24 rotates by obtaining a driving force from a feeding motor (not shown). When the feeding roller 24 rotates and the arc portion comes into contact with the surface of the recording paper P stored in a stacked state in the recording paper storage portion 22 and rotates, the recording paper P is fed into the first paper transport path 21 one by one. .

  The first paper feed roller pair 28 includes a first paper feed roller 28a and a first presser roller 28b. The first paper feed roller 28 a is disposed at a position that constitutes the first curved portion 27 of the first paper transport path 21. The first paper feed roller 28a rotates by obtaining a driving force from a paper feed motor (not shown). The first pressing roller 28b is rotatably arranged with a predetermined pressing force on the outer peripheral portion of the first paper feeding roller 28a. The first paper feed roller pair 28 sandwiches the recording paper P fed into the first paper transport path 21 by the recording paper feed mechanism 23 between the first paper feed roller 28a and the first presser roller 28b, and 1 sheet is fed into the straight portion (X direction) of the paper transport path 21.

  Two second paper feed roller pairs 29 are provided in parallel near the paper discharge port 15 of the outer case 12. The two second paper feed roller pairs 29 each include a second paper feed roller 29a and a second presser roller 29b. The two second paper feed rollers 29a are respectively disposed in the lower part of the first paper transport path 21 in the Z direction, and rotate by obtaining a driving force from a paper feed motor (not shown). The two second pressing rollers 29b are respectively positioned in the upper part of the first sheet transport path 21 in the Z direction, and are rotatably arranged with a predetermined pressing force on the outer peripheral portion of the second sheet feeding roller 29a to sandwich the recording sheet P. . The second paper feed roller pair 29, in cooperation with the first paper feed roller pair 28, transports the recording paper P fed to the straight portion of the first paper transport path 21 in the direction of the paper discharge port 15. An arrow S (+) shown in FIG. 2 indicates the conveyance direction of the recording paper P at this time, and hereinafter, the S (+) direction is referred to as a positive conveyance direction (positive direction).

  As shown in FIG. 2, the printing mechanism 30 includes an inkjet head 32, a carriage 33, a platen 34, and a carriage feed mechanism (not shown). The printing mechanism 30 includes a second paper feed roller provided between the first paper feed roller pair 28 and the second paper feed roller pair 29 of the first paper transport mechanism 25 described above, specifically, in the vicinity of the paper discharge port 15. It is arranged on the pair 29 side.

  The ink-jet head 32 has a plurality of nozzles (not shown) that discharge ink as ink droplets supplied from the ink cartridge housed in the cartridge housing portion described above. The inkjet head 32 is mounted on the carriage 33 with the nozzle facing downward in the Z direction in FIG. 2, that is, toward the recording paper P side (first paper transport path 21 side). The carriage 33 is movably supported by a carriage shaft 36 extending in the width direction (Y direction) of the recording paper P, and is reciprocated in the Y direction by a carriage feed mechanism. The platen 34 is disposed at a position facing the inkjet head 32 and the first paper transport path 21 and has a function of defining the printing position of the printing mechanism 30.

  When a print command is transmitted from an external computer or the like (not shown), the printer 10 stores the recording paper P stored in a stacked state in the recording paper storage unit 22 one by one by the first paper transport mechanism 25. 21 is conveyed in the S (+) direction in the figure at a predetermined paper feed pitch. The printing mechanism 30 selectively ejects ink as ink droplets in accordance with print data transmitted from an external computer or the like while moving the inkjet head 32 in the Y direction in the figure with respect to the recording paper P being conveyed. As a result, desired information is printed on the recording paper P. When the print command from the external computer or the like is single-sided printing, the printed recording paper P is issued from the paper discharge port 15 of the outer case 12 and held on the paper discharge tray 11 by the first paper transport mechanism 25. .

(For duplex printing)
Next, a case will be described in which information is printed on one side Pa and the other side Pb of the recording paper P and duplex printing is performed using the first paper transport mechanism 25, the printing mechanism 30, and the paper reversing mechanism 45.

  As shown in FIG. 2, the sheet reversing mechanism 45 is disposed behind the printer 10 in the X direction, and includes a second sheet transport path 41, a third sheet feed roller pair 46 and a fourth sheet as a plurality of sheet feed roller pairs. A feed roller pair 47 and a paper transport guide group 50 are provided. The second paper conveyance path 41 indicated by a two-dot chain line in the drawing is formed in a substantially elliptic curve shape as a loop shape having the vicinity of the first curved portion 27 of the first paper conveyance path 21 as a start point and an end point. Here, the upper curved portion of the substantially elliptic curve extending in the Z direction in the drawing of the second paper transport path 41 is referred to as a second curved portion 43, and the lower curved portion is referred to as a third curved portion 44. In the second paper transport path 41, the recording paper P is transported in the clockwise direction (arrow T direction) in the drawing.

  The third paper feed roller pair 46 is disposed in the vicinity of the second curved portion 43 of the second paper transport path 41, in other words, in the vicinity of the first curved portion 27 of the first paper transport path 21. The third paper feed roller pair 46 includes a third paper feed roller 46a and a third presser roller 46b. The third paper feed roller 46 a is disposed inside the second curved portion 43 of the second paper transport path 41. The third paper feed roller 46a rotates by obtaining a driving force from a paper feed motor (not shown). The third presser roller 46b is rotatably disposed on the outer peripheral portion of the third paper feed roller 46a with a predetermined pressing force. The third paper feed roller pair 46 is a paper feed roller pair that the recording paper P reaches first in the paper reversing mechanism 45.

  The fourth paper feed roller pair 47 is disposed in the vicinity of the third curved portion 44 of the second paper transport path 41. The fourth paper feed roller pair 47 includes a fourth paper feed roller 47a and a fourth presser roller 47b. The fourth paper feed roller 47 a is disposed inside the third curved portion 44 of the second paper transport path 41. The fourth paper feed roller 47a rotates by obtaining a driving force from a paper feed motor (not shown). The fourth presser roller 47b is rotatably arranged with a predetermined pressing force on the outer peripheral portion of the fourth paper feed roller 47a.

  The paper transport guide group 50 includes a first paper guide portion 52 as a paper guide and a second paper guide portion 57. The first paper guide unit 52 is located at a position where the third paper feed roller pair 46 and the fourth paper feed roller pair 47 of the second paper transport path 41 are connected, in other words, the second paper transport path 41 having a substantially elliptic curve shape. It is provided at a position connecting the second bending portion 43 and the third bending portion 44. The first paper guide section 52 includes a first guide 54 that guides one surface Pa of the recording paper P, and a second guide 53 that guides the other surface Pb of the recording paper P, and a second paper transport path. It is arranged at a position facing 41 across. The first paper guide unit 52 has a function of guiding the paper thickness direction of the recording paper P conveyed through the second paper conveyance path 41. The second paper guide portion 57 is disposed so as to connect the fourth paper feed roller pair 47 of the second paper transport path 41 and the first paper feed roller pair 28 of the first paper transport mechanism 25, and one side of the recording paper P Guide the surface Pa. Details of the paper transport guide group 50 will be described later.

  When a double-sided printing command is transmitted from an external computer or the like (not shown), the printer 10 executes printing on the one side Pa described above. Then, the first paper feed roller pair 28 and the second paper feed roller pair 29 of the first paper transport mechanism 25 are reversely rotated, and the recording paper P on which the printing on one surface Pa is completed follows the first paper transport path 21. Then, it is conveyed in the reverse direction (S (−) direction).

  The recording paper P conveyed in the reverse direction is carried into the second paper conveyance path 41 of the paper reversing mechanism 45. At this time, it is preferable to operate a path branch mechanism (not shown) to block the first paper transport path 21 from the recording paper feed mechanism 23 to the first paper feed roller pair 28. The loaded recording paper P advances in the direction of arrow T along the second paper transport path 41 and is sandwiched between the third paper feed roller 46a and the third presser roller 46b of the third paper feed roller pair 46. The direction of the recording paper P is changed by the rotation of the third paper feed roller 46 a and travels between the first guide 54 and the second guide 53 of the first paper guide portion 52 to reach the fourth paper feed roller pair 47. .

  The recording paper P is sandwiched between the fourth paper feed roller 47a and the fourth presser roller 47b of the fourth paper feed roller pair 47. The recording paper P is changed in direction by the rotation of the fourth paper feed roller pair 47 and advances along the second paper guide portion 57 to reach the first paper feed roller pair 28. At this time, the first paper feed roller pair 28 of the first paper transport mechanism 25 rotates in the forward direction and feeds the recording paper P into the first paper transport path 21. Since the recording paper P makes a round in the direction of arrow T along the second paper conveyance path 41 having a substantially elliptic curve, the printed one surface Pa of the recording paper P faces downward in the Z direction, and the other surface Pb before printing is It faces upward in the Z direction.

  The recording paper P in this state is transported in the S (+) direction in the drawing by the first paper transport mechanism 25 along the first paper transport path 21 at a predetermined paper feed pitch. The printing mechanism 30 selectively selects ink as ink droplets according to print data transmitted from an external computer or the like while moving the inkjet head 32 in the Y direction in the figure with respect to the other side Pb of the recording paper P being conveyed. To discharge. Therefore, desired information is also printed on the other side Pb of the recording paper P on which information is already printed on one side Pa, and double-sided printing is completed. The recording paper P that has been printed on both sides is issued from the paper discharge port 15 of the outer case 12 and is held on the paper discharge tray 11.

  The control unit comprehensively controls the printer 10 including the first paper transport mechanism 25, the paper reversing mechanism 45, and the printing mechanism 30 described above.

(About paper removal mechanism)
Here, the sheet removing mechanism will be described with reference to FIGS. FIG. 3 is an external perspective view of a printer including a paper removal mechanism. Note that the X direction, Y direction, and Z direction shown in FIG. 3 are the same directions as the X direction, Y direction, and Z direction shown in FIGS. 1 and 2.

  In the case of duplex printing, the printer 10 described above executes printing on one surface Pa of the recording paper P shown in FIG. 2, and the recording paper P is moved in the reverse direction on the first paper transport path 21 by the first paper transport mechanism 25. Transport to. Then, the recording paper P is carried into the second paper conveyance path 41 of the paper reversing mechanism 45. Since the recording paper P has information printed on one surface Pa by ink droplets, the ink may not be sufficiently dried. If the ink is not sufficiently dried, the recording paper P is damp and has reduced rigidity. This tendency is particularly remarkable in the case of high-density printing such as images. When the rigidity of the recording paper P is lowered, deformation such as folding or distortion occurs, and problems such as paper jam occur.

  The inventor conducted various experiments and observations including a paper path structure, quick-drying ink and the like in order to reduce this problem. As a result, it has been found that there is a high possibility that problems such as a paper jam of the recording paper P will occur at a place where the course is first changed. Further, it has been found that after the place, the ink dries and the trouble such as paper jam is extremely reduced. The sheet removing mechanism 60 according to the present invention is based on this knowledge.

  As shown in FIGS. 2 and 3, the paper removal mechanism 60 includes the opening / closing lid 19, the first paper guide portion 52 of the paper transport guide group 50, and the opening / closing mechanism 65.

  As shown in FIGS. 1B and 3, the opening / closing lid 19 has one surface 19 a (outer surface) as a constituent member (case member) of the outer case 12, and the lower surface side of the outer case 12 (downward in the Z direction in the figure). Side) can be opened and closed in the direction of arrow A. The opening / closing lid 19 is provided with an opening / closing mechanism 65. The opening / closing lever 64 is formed with two hooks 66 and two operation portions 67 (see FIG. 1B) on a cylindrical shaft 63, and is rotatable on the other surface 19b (inner surface) of the opening / closing lid 19. It is attached.

  At this time, the operation unit 67 is exposed from one surface 19a (outer surface) of the opening / closing lid 19. The hook 66 is disposed on the other surface 19b side of the opening / closing lid 19 and is disposed so as to engage with an engaging portion 66a provided in the upper case 13 when the opening / closing lid 19 is in a closed state. Therefore, in the state shown in FIG. 1B, when the operating portion 67 is pushed down, the hook 66 is detached from the engaging portion 66a, rotates around the fulcrum 62 in the direction of arrow A, and is in the open state shown in FIG. It becomes.

  A first guide 54 is integrally formed on the other surface 19 b of the opening / closing lid 19. Specifically, a plurality of plate-like ribs 54a constituting the first guide 54 rise along the second paper transport path 41 shown in FIG. 2 at a predetermined interval in the Y direction. For this reason, when the opening / closing lid 19 is in the open state, the entire range of the second paper transport path 41 extending from the second curved portion 43 to the third curved portion 44 is released. That is, the third paper feed roller 46 a of the third paper feed roller pair 46 and the second guide 53 of the first paper guide portion 52 can also be visually observed.

  In the present embodiment, the third paper feed roller 46a is divided and formed in the Y direction in order to realize smooth travel of the recording paper P in the second paper transport path 41, and the second guide 53 is also Similar to the first guide 54, it is formed as a plurality of plate-like ribs 53 a that rise at a predetermined interval in the Y direction. Further, the plate-like ribs 53a of the second guide 53 and the plate-like ribs 54a of the first guide 54 are arranged so as to be alternately arranged in the Y direction. Further, the plate-like ribs 53a of the second guide 53 and the plate-like ribs 54a of the first guide 54 along the second curved portion 43 and the third curved portion 44 of the second paper transport path 41 are smooth on the recording paper P. Curvature and shape are determined in order to realize smooth running and easy removal of the jammed recording paper P.

Hereinafter, effects of the present embodiment will be described.
(1) The paper removal mechanism 60 described above is a third paper feed roller pair that is a place where the recording paper P on which one side Pa, which is the starting point of the paper jam, is printed is changed in the paper reversing mechanism 45 first. Then, the range extending to the second curved portion 43 and the third curved portion 44 of the second paper transport path 41 where the paper jam is likely to occur is released. For this reason, even when a paper conveyance failure such as a paper jam occurs, it is easy to deal with removal of the recording paper P or the like.

  (2) In the sheet removing mechanism 60 described above, the first guide 54 is formed integrally with the opening / closing lid 19 constituting the exterior case 12. As a result, the number of parts of the printer 10 can be reduced, and space saving can be realized by reducing the increase in depth.

  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 embodiment, the case where the third paper feed roller pair 46 is opened when the opening / closing lid 19 is opened has been described as an example, but the present invention is not limited thereto. The third pressing roller 46b of the third paper feeding roller pair 46 may be disposed on the opening / closing lid 19 side, and the third paper feeding roller 46a and the third pressing roller 46b may be separated when the opening / closing lid 19 is opened. . In this case, the jammed recording paper P can be more easily removed.

  DESCRIPTION OF SYMBOLS 10 ... Printer (inkjet printer) as printing apparatus, 12 ... Exterior case, 19 ... Opening / closing lid as case member, 20 ... Printer mechanism part, 21 ... First paper conveyance path, 25 ... First paper conveyance mechanism, 28 ... First paper feed roller pair, 29 ... second paper feed roller pair, 30 ... printing mechanism, 32 ... ink jet head, 40 ... paper transport mechanism, 41 ... second paper transport path, 45 ... paper reversing mechanism, 46 ... first Third paper feed roller pair as a paper feed roller pair to reach, 47... 4th paper feed roller pair, 50... Paper transport guide group, 52... First paper guide section, 53. , 57 ... second paper guide section, 60 ... paper removal mechanism, 65 ... opening / closing mechanism, P ... recording paper.

Claims (6)

A paper removal mechanism of a printing apparatus provided with a paper reversing mechanism for conveying recording paper and reversing the front and back,
The paper reversing mechanism includes a looped paper conveyance path,
A plurality of paper feed roller pairs arranged along the paper transport path;
A paper guide for guiding the front and back surfaces of the recording paper conveyed by the plurality of paper feed roller pairs,
The paper guide includes a first guide that guides one surface of the recording paper and is positioned on the exterior case side of the printing apparatus, and a second guide that guides the other surface,
The first guide is set to be openable,
A paper removal mechanism comprising the pair of paper feed rollers located on the most upstream side in the paper conveyance direction of the paper conveyance path and opening at least a part of the paper conveyance path on the downstream side thereof.   2. The paper removal according to claim 1, wherein the pair of paper feed rollers positioned on the most upstream side in the paper transport direction of the paper transport path is disposed at a position for changing a traveling direction of the recording paper. mechanism.   The sheet removing mechanism according to claim 1, wherein the first guide is a case member constituting the exterior case.   2. The first guide and the second guide have plate-like ribs in a direction intersecting with the recording paper to be conveyed, and guide the recording paper at an end surface of the plate-like rib. The sheet removing mechanism according to any one of claims 1 to 3.   5. The sheet removing mechanism according to claim 1, wherein the printing apparatus is an ink jet system that ejects ink as ink droplets. 6. A printing mechanism for printing information on recording paper;
A first paper transport mechanism for transporting the recording paper to the printing mechanism;
A paper reversing mechanism for reversing the surface of the recording paper on which one side is printed by the printing mechanism;
A printing apparatus comprising: the paper removal mechanism according to claim 1 provided in a paper conveyance path of the paper reversing mechanism.

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