JP2008056458A - Paper delivery mechanism for ink jet printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper delivery mechanism for an ink jet printer for surely preventing the fall-off of a spur. <P>SOLUTION: The paper delivery mechanism for the ink jet printer comprises the spur 21 contacting with paper 12 to be delivered and rotating following the movement of the paper 12, a shaft 23 formed of resin for rotating together with the spur 21, and a holder 41 to which the shaft 23 is rotatably fitted. The spur 21 is formed of metal and provided integrally with the shaft 23. The shaft 23 includes a large diameter portion 24 having a relatively large diameter for regulating the movement of the shaft 23 along the rotative direction of the shaft 23 (the axial direction of a center axis 101), and small diameter portions 25m, 25n each having a relatively small diameter. The small diameter portions 25m, 25n are fitted to the holder 41 for regulating the movement of the shaft 23 along the direction of delivering the paper 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a paper discharge mechanism for an ink jet printer, and more specifically, a resin shaft and an insert resin molding that are integrated with the shaft to move the discharged paper. The present invention relates to a paper discharge mechanism of an ink jet printer including a metal spur that is rotated by being driven.

  With regard to a discharge mechanism of a conventional ink jet printer, for example, Japanese Patent Application Laid-Open No. 2002-241209 discloses a stable discharge without stabilizing the urging force of a bar spring that pivotally supports a discharge driven roller and without damaging the recording paper. (Patent Document 1) discloses a paper discharge driven roller mounting device for the purpose of enabling the above. In Patent Document 1, the paper discharge driven roller is configured by a spur having a star shape having a plurality of teeth on a peripheral surface of a disc and a bearing portion rotatably supported by a bar spring. The spur and the bearing portion are integrally formed of a single metal member. The shaft portion has a constant diameter along the rotation axis direction. The bearing portion has a shape protruding to one side of the spur.

  Japanese Patent Application Laid-Open No. 2004-74517 discloses a recording for the purpose of improving the assembly property of a rotating body while simplifying the structure and obtaining good moldability, while achieving both accuracy and appearance. An apparatus is disclosed (Patent Document 2). The recording apparatus disclosed in Patent Document 2 includes a discharge unit that discharges the recording medium to the outside of the recording apparatus. The ejecting unit is provided with a spur having a thin and sharp protrusion on the recording surface side of the recording medium.

  FIG. 10 is a perspective view showing a spur mounting structure in the recording apparatus disclosed in Patent Document 2. FIG. 11 is a cross-sectional view of the spur mounting structure in FIG. With reference to FIG. 10 and FIG. 11, the spur shaft 114 penetrates the spur 112 which is a rotating body and is rotatably supported. The spur attachment portion 113 includes an upper support portion 113a and a lower support portion 113b. The upper support portion 113a supports the upper side of both end portions of the spur shaft 114. The lower support portion 113b supports the lower side of the central portion of the spur shaft 114. The spur shaft 114 is formed of a tightly wound spring.

Japanese Patent Application Laid-Open No. 9-193373 discloses an ink jet printer that prevents printed paper from slidingly contacting a support portion of a paper discharge serpentine roller and getting dirty (Patent Document 3). In Patent Document 3, a paper discharge serrated roller is rotatably supported around a coil spring. Both ends of the coil spring are supported by the support portion of the holder.
JP 2002-241209 A Japanese Patent Laid-Open No. 2004-74517 JP-A-9-193373

  In the spur mounting structure shown in FIGS. 10 and 11, it is assumed that the recording medium (paper) is clogged at the discharge portion and the user tries to forcibly pull out the paper. In this case, the paper bites into the spur 112 and an excessive force is applied to the spur 112 along the paper discharge direction (the direction indicated by the arrow 201 in FIG. 10). However, the spur 112 is supported by the spur attachment portion 113 via a spur shaft 114 formed of a spring in the paper discharge direction. For this reason, the spur 112 may be dropped from the spur mounting portion 113 together with the spur shaft 114, and the recording apparatus may be damaged.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems and to provide a paper discharge mechanism for an ink jet printer that reliably prevents spurs from falling off.

  A discharge mechanism of an ink jet printer according to one aspect of the present invention includes a spur that contacts a discharged paper and rotates in accordance with the movement of the paper, and a shaft portion that is formed of resin and rotates together with the spur. And a holder fitted so that the shaft portion is rotatable. The spur is formed of metal and is provided integrally with the shaft portion. The shaft portion restricts movement of the shaft portion along the rotation axis direction of the shaft portion, and includes a large diameter portion having a relatively large diameter and a small diameter portion having a relatively small diameter. The small diameter portion is fitted to the holder so that the movement of the shaft portion along the paper discharge direction is restricted. The spur is provided integrally with the large diameter portion by insert resin molding. The small diameter portion is disposed on both sides of the spur in the direction of the rotation axis of the shaft portion. The shaft portion is formed with a hole penetrating in the rotation axis direction of the shaft portion. The paper discharge mechanism of the ink jet printer further includes a spring that is inserted through the hole and supports the spur. The spring includes fixed ends. The spring deforms in a direction away from the paper surface of the paper with both ends as fulcrums, thereby giving the spur an elastic force that presses the paper. The diameter of the hole gradually increases as it goes from the center side in the rotation axis direction of the shaft portion toward the end portion side. The small diameter portion is fitted to the holder so that the shaft portion is allowed to move in a direction away from the paper surface of the paper.

  A discharge mechanism of an ink jet printer according to another aspect of the present invention includes a spur that comes into contact with a discharged paper and rotates in accordance with the movement of the paper, and a shaft portion that is formed of resin and rotates together with the spur. And a holder fitted so that the shaft portion is rotatable. The spur is formed of metal and is provided integrally with the shaft portion. The shaft portion restricts movement of the shaft portion along the rotation axis direction of the shaft portion, and includes a large diameter portion having a relatively large diameter and a small diameter portion having a relatively small diameter. The small diameter portion is fitted to the holder so that the movement of the shaft portion along the paper discharge direction is restricted.

  According to the discharge mechanism of the ink jet printer configured as described above, by providing the small-diameter portion and the large-diameter portion in the shaft portion, the shaft portion is moved in two directions, ie, the paper discharge direction and the rotation shaft direction of the shaft portion. The spur can be supported to regulate in direction. As a result, when the paper is jammed in the paper discharge mechanism, the spur can be prevented from dropping from the holder together with the shaft portion even if the user tries to forcibly pull out the paper in a state of being spurred.

  Preferably, the spur is provided integrally with the large diameter portion by insert resin molding. According to the discharge mechanism of the ink jet printer configured as described above, the spur is provided in the large diameter portion having a relatively large diameter, thereby sufficiently securing a margin for fitting the spur to the large diameter portion at the time of insert resin molding. can do.

  Preferably, the small diameter portion is disposed on both sides of the spur in the rotation axis direction of the shaft portion. According to the discharge mechanism of the ink jet printer configured as described above, since the small diameter portion is fitted to the holder on both sides of the spur along the rotation axis direction of the shaft portion, it is possible to more reliably prevent the spur from falling off. it can.

  Preferably, the shaft portion is formed with a hole penetrating in the rotation axis direction of the shaft portion. The paper discharge mechanism of the inkjet printer further includes a spring that is inserted through the hole and supports the spur. The spring includes fixed ends. The spring deforms in a direction away from the paper surface of the paper with both ends thereof as fulcrums, thereby applying an elastic force that presses the paper to the spur. The diameter of the hole gradually increases as it goes from the center side in the rotation axis direction of the shaft portion toward the end portion side. According to the paper discharge mechanism of the ink jet printer configured as described above, it is possible to prevent the spring from being suddenly deformed between the both ends and the shaft portion by forming the hole in a tapered shape. Thereby, it can suppress that an excessive stress generate | occur | produces in a spring and can suppress deterioration with time of a spring.

  Preferably, the small diameter portion is fitted to the holder so that the shaft portion is allowed to move in a direction away from the paper surface of the paper. According to the paper discharge mechanism of the ink jet printer configured as described above, the position of the spur along the direction away from the paper surface of the paper can be adjusted according to the thickness of the paper.

  Preferably, the large diameter portion is disposed on both sides of the small diameter portion in the rotation axis direction of the shaft portion. The large diameter portion holds the holder fitted with the small diameter portion. According to the discharge mechanism of the ink jet printer configured as described above, the movement of the shaft portion along the rotation axis direction of the shaft portion can be more reliably regulated.

  As described above, according to the present invention, it is possible to provide a paper discharge mechanism for an ink jet printer that reliably prevents spurs from falling off.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

(Embodiment 1)
FIG. 1 is a perspective view showing an ink jet printer to which a paper discharge mechanism according to Embodiment 1 of the present invention is applied. FIG. 2 is a cross-sectional view schematically showing the ink jet printer taken along the line II-II in FIG.

  1 and 2, an inkjet printer 10 includes a paper feed tray 13 on which paper 12 is placed, a paper feed mechanism 14 that transports paper 12 placed on the paper feed tray 13, and an ink cartridge. 17, a carriage drive mechanism 16 that reciprocates the carriage 15 in a direction (main scanning direction) orthogonal to the sheet conveyance direction (sub-scanning direction), and a control device 18.

  The ink cartridge 17 includes an inkjet head 19. The inkjet head 19 is disposed to face the paper 12 conveyed by the paper feed mechanism 14. The ink jet head 19 causes liquid ink particles (droplets) to fly toward the paper 12 in accordance with a control signal received from the control device 18. An image forming unit 50 represented by a one-dot chain line in FIG. 1 faces the ink jet head 19 and is a position where an image is formed on the paper 12.

  The carriage drive mechanism 16 includes a main shaft 56, a carriage drive motor 61, a drive pulley 62, a driven pulley 63, and a timing belt 64. The main shaft 56 extends in the main scanning direction and guides the carriage 15. The drive pulley 62 is connected to the rotation shaft of the carriage drive motor 61. The timing belt 64 is stretched between the driving pulley 62 and the driven pulley 63 in the main scanning direction.

  A maintenance unit 57 is provided at one end in the main scanning direction and at a position facing the carriage 15. The maintenance unit 57 performs maintenance of the inkjet head 19 when, for example, the nozzle of the inkjet head 19 is clogged.

  The paper feed mechanism 14 includes a pick roller 54, a feed roller 51, and a paper discharge roller 53. The pick roller 54 and the feed roller 51 are rotationally driven by a motor (not shown). The paper discharge roller 53 is connected to the feed roller 51 via a belt 52. The paper discharge roller 53 is driven to rotate in synchronization with the rotation of the feed roller 51.

  The pick roller 54 and the feed roller 51 are provided on the upstream side of the image forming unit 50 on the path of the sheet 12 conveyed by the sheet feeding mechanism 14. The paper discharge roller 53 is provided on the downstream side of the image forming unit 50 on the path of the paper 12 conveyed by the paper supply mechanism 14. That is, the paper discharge roller 53 constitutes a paper discharge mechanism that discharges the paper 12 on which the image is formed to the outside of the printer. A spur roller 20 is provided at a position facing the paper discharge roller 53. The spur roller 20 is disposed on the upper side in the vertical direction of the paper discharge roller 53. A plurality of spur rollers 20 are provided at intervals in the main scanning direction.

  The control device 18 is configured by, for example, a CPU, a ROM, a RAM, or an ASIC (application specific integrated circuit) that integrates these functions. The control device 18 controls the paper feed mechanism 14, the carriage drive mechanism 16, and the inkjet head 19 using image data transmitted from an external device such as a personal computer.

  FIG. 3 is a cross-sectional view of the paper discharge mechanism of the ink jet printer along the line III-III in FIG. 4 is a cross-sectional view of the paper discharge mechanism along the line IV-IV in FIG. FIG. 5 is a diagram showing a spur roller provided in the paper discharge mechanism in FIG.

  3 to 5, the spur roller 20 includes a spur 21 and a shaft portion 23. The spur 21 comes into contact with the conveyed paper 12 when the paper is discharged by the paper discharge roller 53, and rotates around the central shaft 101 following the movement of the paper 12. At this time, in order to avoid contact between the spur 21 and the ink of the image formed on the paper 12 as much as possible, the spur 21 is formed with a plurality of teeth arranged around the central axis 101 in the circumferential direction. ing. The spur 21 rotates while its teeth are in contact with the paper 12. The spur 21 has a shape extending in a ring shape around the central axis 101. The axial direction of the central axis 101 coincides with the main scanning direction of the printer.

  The spur 21 is made of metal. The spur 21 is formed by, for example, pressing stainless steel. The shaft portion 23 is made of resin. The spur 21 is provided integrally with the shaft portion 23 by insert resin molding. The shaft portion 23 rotates around the central shaft 101 together with the spur 21. The shaft portion 23 is disposed on both sides of the spur 21 in the axial direction of the central shaft 101.

  FIG. 5 shows a case where one spur 21 is insert-molded on the shaft portion 23, but the present invention is not limited to this, and a plurality of spurs 21 are spaced in the axial direction of the central shaft 101. Insert resin molding may be used.

  The shaft portion 23 includes small diameter portions 25m and 25n having a relatively small diameter (hereinafter referred to as the small diameter portion 25 when not distinguished) and a large diameter portion 24 having a relatively large diameter. The spur 21, the small diameter portion 25, and the large diameter portion 24 are arranged coaxially around the central axis 101. The small diameter portion 25m and the small diameter portion 25n have the same diameter. The spur 21 has a larger diameter than the large diameter portion 24. The small diameter portion 25 m and the small diameter portion 25 n are disposed on both sides of the large diameter portion 24 in the axial direction of the central shaft 101.

  The spur 21 is provided in the large diameter portion 24. The spur 21 is provided with the inner peripheral portion of the spur 21 embedded in the outer periphery of the large diameter portion 24. In this case, since the large-diameter portion 24 has a relatively large diameter, compared with the case where the spur 21 is provided in the small-diameter portion 25, a sufficient allowance for the spur 21 to be fitted to the shaft portion 23 can be secured. Thereby, the axial part 23 and the spur 21 can be combined more firmly.

  A hole 27 is formed in the shaft portion 23. The hole 27 extends in the axial direction of the central shaft 101 and passes therethrough. The hole 27 includes a diameter-expanded portion 27 c that gradually increases in diameter from the center side to the end side in the axial direction of the center shaft 101. The enlarged diameter portion 27 c is formed at both ends of the shaft portion 23 along the axial direction of the central shaft 101. The diameter-expanded portion 27c increases the diameter at a constant rate along the axial direction of the central axis 101. The diameter-expanded portion 27c may be formed such that the rate of diameter increase gradually increases from the center side to the end side in the axial direction of the central shaft 101. The spur roller 20 has a symmetrical shape in the axial direction of the central shaft 101.

  The spur roller 20 is attached to the holder 41. The holder 41 is made of resin. The holder 41 is made of, for example, polyoxymethylene (POM). The holder 41 is fixed to the printer body.

  Holder 41 includes fitting portions 41m and 41n. The fitting portions 41 m and 41 n have a rib shape extending toward the paper 12 discharged by the paper discharge roller 53. The fitting portion 41m and the fitting portion 41n are provided at a distance in the axial direction of the central shaft 101. Grooves 42 are formed in the fitting portions 41m and 41n. The groove 42 opens at a position facing the paper 12. The groove 42 extends in a direction away from the paper surface of the paper 12.

  The small diameter portion 25m and the small diameter portion 25n are fitted to the holder 41 so as to be rotatable. The small diameter part 25m and the small diameter part 25n are fitted in grooves 42 formed in the fitting part 41m and the fitting part 41n, respectively. The small diameter portions 25m and 25n are respectively fitted in the direction along the direction in which the paper 12 is discharged by the paper discharge roller 53 (hereinafter simply referred to as the paper discharge direction of the paper 12), as indicated by an arrow 210 in FIG. It abuts on the joint portions 41m and 41n. With such a configuration, the holder 41 regulates the movement of the spur roller 20 in the paper discharge direction of the paper 12. On the other hand, the holder 41 allows the spur roller 20 to move in a direction away from the paper surface of the paper 12. The direction away from the paper surface of the paper 12 is orthogonal to the paper discharge direction of the paper 12.

  The large diameter portion 24 is fitted to the holder 41 so as to be rotatable. The large diameter portion 24 is fitted between the fitting portion 41m and the fitting portion 41n. The large diameter portion 24 contacts the fitting portion 41m and the fitting portion 41n in the axial direction of the central shaft 101. With such a configuration, the holder 41 restricts the movement of the spur roller 20 in the axial direction of the central shaft 101. The spur 21 is positioned between the fitting portion 41m and the fitting portion 41n.

  A close contact spring 47 is inserted into the hole 27. The close contact spring 47 is a coil spring having a cylindrical shape in which a continuous metal wire is tightly wound spirally without a gap. The shaft portion 23 is rotatably supported by the contact spring 47. The contact spring 47 extends along the central axis 101 while being inserted through the hole 27. The close contact spring 47 includes one end 47p and the other end 47q at both extending ends thereof. One end 47p and the other end 47q are fixed to the holder 41. The contact spring 47 is deformed in a direction away from the paper surface of the paper 12 with the one end 47p and the other end 47q as fulcrums. The contact spring 47 imparts to the spur 21 an elastic force in a direction that urges the paper surface of the paper 12 toward the paper discharge roller 53.

  As shown in FIG. 5, in the present embodiment, the spur roller 20 includes a resin shaft portion 23 and a metal spur 21 provided integrally with the shaft portion 23 by insert resin molding. In this case, as compared with the case where the spur roller 20 including the spur 21 and the shaft portion 23 is integrally formed from metal, the degree of freedom of the shape of the shaft portion 23 can be increased. For this reason, the small diameter part 25 and the large diameter part 24 fitted to the holder 41 can be easily formed in the shaft part 23. In particular, in the present embodiment, shaft portions 23 are disposed on both sides of the spur 21. It is difficult to form such a shape integrally from metal by, for example, drawing. On the other hand, in this Embodiment, the shape of the axial part 23 in FIG. 5 can be obtained easily by selecting the shape of the metal mold | die used at the time of insert resin molding suitably.

  Moreover, in this Embodiment, the spur 21 can be shape | molded by making thickness thin in the axial direction of the center axis | shaft 101, and making the front-end | tip of a tooth | gear sharp by forming the spur 21 from a metal. As a result, the contact area between the spur 21 and the paper 12 can be kept small.

  Further, in the present embodiment, since the tapered enlarged diameter portion 27c is formed in the hole 27, the contact spring 47 is deformed following the shape of the enlarged diameter portion 27c. For this reason, it is possible to avoid a situation in which the distance between the end portion of the shaft portion 23 and the fixed end of the contact spring 47 is too short and the contact spring 47 is suddenly deformed between them. Thereby, it is possible to suppress an excessive stress from being generated in the contact spring 47 and improve the reliability of the contact spring 47. Further, it is possible to avoid a situation in which the force applied to the paper 12 from the spur 21 becomes too large and the traces of the teeth of the spur 21 remain on the surface of the paper 12.

  The discharge mechanism of the ink jet printer 10 according to the first embodiment of the present invention is made of a spur 21 that is in contact with the discharged paper 12 and rotates following the movement of the paper 12, and rotates together with the spur 21. And a holder 41 fitted so that the shaft portion 23 is rotatable. The spur 21 is made of metal and is provided integrally with the shaft portion 23. The shaft portion 23 restricts the movement of the shaft portion 23 along the rotation axis direction of the shaft portion 23 (the axial direction of the central shaft 101), and a large diameter portion 24 having a relatively large diameter and a relatively small diameter. And a small diameter portion 25 having The small diameter portion 25 is fitted to the holder 41 so that the movement of the shaft portion 23 along the paper discharge direction of the paper 12 is restricted.

  The spur 21 is provided integrally with the large diameter portion 24 by insert resin molding. The small diameter portion 25 is disposed on both sides of the spur 21 in the rotation axis direction of the shaft portion 23.

  A hole 27 is formed in the shaft portion 23 so as to penetrate in the rotation axis direction of the shaft portion 23. The paper discharge mechanism of the inkjet printer 10 further includes a close contact spring 47 that is inserted into the hole 27 and supports the spur 21. The contact spring 47 includes one end 47p and the other end 47q as fixed ends. The contact spring 47 imparts an elastic force that presses the paper 12 to the spur 21 by being deformed in a direction away from the paper surface of the paper 12 with the one end 47p and the other end 47q as fulcrums. The hole 27 gradually increases in diameter as it goes from the center side in the rotation axis direction of the shaft portion 23 toward the end portion side. The small diameter portion 25 is fitted to the holder 41 so that the movement of the shaft portion 23 is allowed in a direction away from the paper surface of the paper 12.

  According to the paper discharge mechanism of the inkjet printer 10 according to the first embodiment of the present invention configured as described above, the small diameter portion 25 is controlled so that the movement of the spur roller 20 in the paper discharge direction of the paper 12 is restricted. Is fitted to the holder 41. For this reason, when the paper 12 is jammed, the spur roller 20 can be prevented from falling off the holder 41 even if the user tries to pull out the paper 12 forcibly. Thereby, the reliability of the inkjet printer 10 can be improved.

(Embodiment 2)
FIG. 6 is a cross-sectional view showing the paper discharge mechanism of the ink jet printer according to Embodiment 2 of the present invention. FIG. 7 is a view showing a spur roller provided in the paper discharge mechanism in FIG. The paper discharge mechanism of the ink jet printer according to the present embodiment basically has the same structure as the paper discharge mechanism of the ink jet printer 10 according to the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  6 and 7, in the present embodiment, shaft portion 23 further includes large diameter portions 31m and 31n having a diameter larger than that of small diameter portion 25. The large diameter portion 31 m and the large diameter portion 31 n are disposed at both ends of the shaft portion 23 along the axial direction of the central shaft 101. In the axial direction of the central shaft 101, a large diameter portion 31m and a large diameter portion 24 are disposed on both sides of the small diameter portion 25m. In the axial direction of the central shaft 101, a large diameter portion 24 and a large diameter portion 31n are disposed on both sides of the small diameter portion 25n.

  The fitting portion 41m into which the small diameter portion 25m is fitted is sandwiched between the large diameter portion 31m and the large diameter portion 24. The fitting portion 41n into which the small diameter portion 25n is fitted is sandwiched between the large diameter portion 24 and the large diameter portion 31n. According to such a configuration, the movement of the spur roller 20 in the axial direction of the central shaft 101 can be more reliably regulated.

  According to the paper discharge mechanism of the ink jet printer according to the second embodiment of the present invention configured as described above, the same effects as those described in the first embodiment can be obtained.

(Embodiment 3)
FIG. 8 is a sectional view showing a paper discharge mechanism of the ink jet printer according to Embodiment 3 of the present invention. FIG. 9 is a view showing a spur roller provided in the paper discharge mechanism in FIG. The paper discharge mechanism of the ink jet printer according to the present embodiment basically has the same structure as the paper discharge mechanism of the ink jet printer 10 according to the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  Referring to FIGS. 8 and 9, in the present embodiment, shaft portion 23 includes a small diameter portion 33 having a relatively small diameter, and large diameter portions 31m and 31n having a relatively large diameter. The large diameter portion 31 m and the large diameter portion 31 n are disposed on both sides of the small diameter portion 33 in the axial direction of the central shaft 101. The spur 21 is provided in the small diameter portion 33.

  The small diameter portion 33 is fitted in a groove 42 formed in the fitting portion 41m and the fitting portion 41n. The large diameter portion 31m and the large diameter portion 31n sandwich the fitting portion 41m and the fitting portion 41n from both sides along the axial direction of the central shaft 101. With such a configuration, the movement of the spur roller 20 in the paper discharge direction of the paper 12 and the movement of the spur roller 20 in the axial direction of the central shaft 101 are restricted.

  According to the discharge mechanism of the ink jet printer according to the third embodiment of the present invention configured as described above, the same effects as those described in the first embodiment can be obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is a perspective view showing an ink jet printer to which a paper discharge mechanism according to Embodiment 1 of the present invention is applied. FIG. It is sectional drawing which represented typically the inkjet printer along the II-II line | wire in FIG. It is sectional drawing of the paper discharge mechanism of the inkjet printer along the III-III line | wire in FIG. FIG. 4 is a cross-sectional view of the paper discharge mechanism along line IV-IV in FIG. 3. It is a figure which shows the spur roller provided in the paper discharge mechanism in FIG. It is sectional drawing which shows the paper discharge mechanism of the inkjet printer in Embodiment 2 of this invention. It is a figure which shows the spur roller provided in the paper discharge mechanism in FIG. It is sectional drawing which shows the paper discharge mechanism of the inkjet printer in Embodiment 3 of this invention. It is a figure which shows the spur roller provided in the paper discharge mechanism in FIG. FIG. 11 is a perspective view showing a spur mounting structure in the recording apparatus disclosed in Patent Document 2. It is sectional drawing of the attachment structure of the spur in FIG.

Explanation of symbols

  10 inkjet printer, 12 paper, 21 spur, 23 shaft, 24, 31m, 31n large diameter part, 25, 25m, 25n, 33 small diameter part, 27 holes, 41 holder, 41m, 41n fitting part, 47 contact spring, 47p One end, 47q The other end, 101 Central axis.

Claims (7)

A spur that contacts the paper to be ejected and rotates following the movement of the paper;
A shaft formed of resin and rotating together with the spur;
A holder fitted so that the shaft portion is rotatable,
The spur is formed of metal and provided integrally with the shaft portion,
The shaft portion restricts movement of the shaft portion along the rotation axis direction of the shaft portion, and includes a large diameter portion having a relatively large diameter and a small diameter portion having a relatively small diameter,
The small diameter portion is fitted to the holder so that the movement of the shaft portion along the paper discharge direction is restricted,
The spur is provided integrally with the large diameter portion by insert resin molding,
The small diameter portion is disposed on both sides of the spur in the rotation axis direction of the shaft portion,
The shaft portion is formed with a hole penetrating in the rotation axis direction of the shaft portion,
Including a fixed end, including a spring inserted through the hole and supporting the spur;
The spring gives an elastic force to press the paper to the spur by deforming in a direction away from the paper surface of the paper with the both ends as fulcrums,
The diameter of the hole gradually increases from the central side in the rotation axis direction of the shaft part toward the end side,
A discharge mechanism of an ink jet printer, wherein the small-diameter portion is fitted to the holder so that the shaft portion is allowed to move in a direction away from the paper surface of the paper. A spur that contacts the paper to be ejected and rotates following the movement of the paper;
A shaft formed of resin and rotating together with the spur;
A holder fitted so that the shaft portion is rotatable,
The spur is formed of metal and provided integrally with the shaft portion,
The shaft portion restricts movement of the shaft portion along the rotation axis direction of the shaft portion, and includes a large diameter portion having a relatively large diameter and a small diameter portion having a relatively small diameter,
A discharge mechanism of an ink jet printer, wherein the small diameter portion is fitted to the holder so that movement of the shaft portion along the discharge direction of the paper is restricted.   The paper ejection mechanism for an ink jet printer according to claim 2, wherein the spur is provided integrally with the large diameter portion by insert resin molding.   4. The paper discharge mechanism for an ink jet printer according to claim 2, wherein the small diameter portion is disposed on both sides of the spur in the rotation axis direction of the shaft portion. 5. The shaft portion is formed with a hole penetrating in the rotation axis direction of the shaft portion,
Including a fixed end, including a spring inserted through the hole and supporting the spur;
The spring gives an elastic force to press the paper to the spur by deforming in a direction away from the paper surface of the paper with the both ends as fulcrums,
5. The paper discharge mechanism for an ink jet printer according to claim 2, wherein the diameter of the hole gradually increases from a central side in a rotation axis direction of the shaft portion toward an end portion side.   6. The inkjet printer according to claim 2, wherein the small-diameter portion is fitted to the holder so that the shaft portion is allowed to move in a direction away from the paper surface of the paper. Paper discharge mechanism. The said large diameter part is arrange | positioned on the both sides of the said small diameter part in the rotating shaft direction of the said shaft part, and clamps the said holder with which the said small diameter part was fitted. Inkjet printer paper discharge mechanism.

Images