JP6429064B2 - Recording device - Google Patents

Description

  The present invention relates to a recording apparatus represented by a facsimile, a printer, and the like.

  An ink jet printer as an example of a recording apparatus is provided with a pair of conveyance rollers for conveying a recording sheet as an example of a medium on the upstream side of a recording head. The conveyance roller pair is generally composed of a driving roller driven by a motor and a driven roller pressed toward the driving roller (for example, Patent Document 1).

  The driving roller is formed by forming a high friction layer on the outer peripheral surface of the metal solid shaft or the metal hollow shaft, the driven roller is formed by resin molding, and the recording paper is nipped by the driving roller and the driven roller. When the driving roller is driven to rotate, it is conveyed downstream.

  Here, when the recording paper is transported by such a pair of transport rollers, the trailing edge of the paper is sent out vigorously when passing through the transport roller pair, and as a result, a phenomenon in which transport accuracy is disturbed, a so-called kicking phenomenon occurs. Such a kicking phenomenon occurs particularly remarkably on thick recording paper (for example, glossy paper or board paper).

JP 2006-247932 A

  As one of means for suppressing the kicking phenomenon, Japanese Patent Application Laid-Open No. H10-228561 discloses a technique for forming a gap smaller than the thickness of the recording paper between the driving roller and the driven roller in advance. According to this, even if the thickness of the recording paper increases, the kicking phenomenon can be suppressed.

  However, in the configuration described in Patent Document 1, it is difficult to properly manage the gap between the driving roller and the driven roller, and in addition, when the recording paper is thin, sufficient nip force cannot be obtained. Therefore, a more preferable technique that can suppress the kicking phenomenon has been desired.

  Therefore, the present invention has been made in view of such a situation, and an object thereof is to provide a recording apparatus that can more appropriately suppress the kicking phenomenon with a simple configuration.

  In order to solve the above problems, a recording apparatus according to a first aspect of the present invention includes a recording head that performs recording on a medium, and a driving roller that is driven by a driving source that conveys the medium toward the recording head. And a driven roller having a diameter larger than that of the drive roller, which is pressed toward the drive roller and rotates in contact with the medium.

  According to this aspect, since the diameter of the driven roller is larger than the diameter of the drive roller, the following effects can be obtained. That is, the rear end of the medium is pushed out from between the driven roller and the driving roller, and at this time, the pushing force accompanying the pushing of the driven roller is more than the pushing force by the relatively large driven roller. The pushing force by the driving roller having a relatively small diameter becomes larger.

  Here, when the rear end of the medium is pushed out from between the driven roller and the driving roller, the driven roller can freely rotate, so that the rotation acts to push out the rear end of the medium vigorously, Since the driving roller is connected to a driving source and cannot be freely rotated, the driving roller does not act so as to push out the rear end of the medium vigorously as compared with the driven roller.

  In this embodiment, such a property is used, and the driven roller that acts to push out the trailing end of the medium vigorously is made larger in diameter than the driving roller so that the pushing force accompanying the pressing becomes relatively small. Accordingly, the kicking phenomenon can be appropriately suppressed with a simple configuration.

  According to a second aspect of the present invention, in the first aspect, a medium support member that supports a medium is provided at a position that can face the recording head, and the medium fed from between the driving roller and the driven roller is And being pressed against the medium support member.

  According to this aspect, the medium support member that supports the medium is provided at a position that can face the recording head, and the medium fed from between the drive roller and the driven roller is pressed against the medium support member. Therefore, the floating of the medium at the position facing the recording head can be effectively suppressed.

  According to a third aspect of the present invention, in the first or second aspect, the driving roller is formed by attaching particles to an outer peripheral surface of a solid shaft or a hollow shaft, and the driven roller is formed of a resin material. It is characterized by being.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the carriage includes the recording head and is movable in a first direction and a second direction that is the opposite direction, and the carriage. And a power transmission mechanism for transmitting the power of the drive source to the drive roller, and the power transmission mechanism under the carriage in a state of being moved to the end portion in the second direction. At least a part of is located.

  According to this aspect, since at least a part of the power transmission mechanism is located under the carriage in a state where it has moved to the end portion in the second direction, the power is within a region necessary for movement of the carriage. As a result, the width of the apparatus can be suppressed, and the volume of the carriage can be secured.

  According to a fifth aspect of the present invention, in the fourth aspect, a discharge roller for discharging the medium is provided on the downstream side of the recording head in the medium conveyance path, and the power transmission mechanism includes a shaft end of the drive roller. A rotary scale comprising a first roller driving gear provided in the section, transmitting power to the discharge roller via the first roller driving gear, and constituting rotation detection means for detecting the rotation of the driving roller, The driving roller driving gear is provided on the first direction side with respect to the driving roller driving gear.

  According to this aspect, since the rotary scale is provided on the first direction side with respect to the first roller driving gear, the detection unit that reads the rotary scale is located on the outermost side of the apparatus main body (carriage movement). It is possible to avoid being arranged outside (in the direction), and to suppress an increase in the size of the apparatus main body (size in the carriage movement direction).

According to a sixth aspect of the present invention, in the fifth aspect, the diameter of the rotary scale is smaller than the diameter of the first roller drive gear.
According to this aspect, since the diameter of the rotary scale is smaller than the diameter of the first roller driving gear, the rotary scale can be protected from the external pressure from above the apparatus.

  According to a seventh aspect of the present invention, in the fifth or sixth aspect, the frame further comprises a frame that supports the first roller, and the frame is along the outer shape of the rotary scale and larger than the diameter of the rotary scale. The convex part which comprises the circular arc shape of a diameter is formed.

  According to this aspect, since the convex portion formed on the frame is formed in an arc shape having a diameter that is larger than the diameter of the rotary scale along the outer shape of the rotary scale, the convex portion is shielded from the rotary scale. It functions as a wall and suppresses ink mist from adhering to the rotary scale.

  According to an eighth aspect of the present invention, in the seventh aspect, the carriage is formed with a concave portion that avoids the convex portion when the carriage moves to an end portion in the second direction. And

  According to this aspect, the carriage is formed with the concave portion that avoids the convex portion formed on the frame when the carriage is positioned at the end portion in the second direction. Therefore, it is not necessary to set the position of the frame to the outside (to prevent interference between the carriage and the frame), and an increase in the lateral width of the apparatus can be suppressed.

1 is an external perspective view of a printer according to the present invention. FIG. 3 is a perspective view of the apparatus main body of the printer according to the invention. FIG. 3 is a perspective view of the apparatus main body of the printer according to the invention. FIG. 3 is a side sectional view showing a paper conveyance path of the printer according to the invention. The elements on larger scale of FIG. The elements on larger scale of FIG. The top view which looked at the carriage from the upper side. The top view which looked at the carriage from the lower side. The perspective view which looked at the carriage from the apparatus front diagonally upward. The perspective view which looked at the carriage from the apparatus front diagonally downward. The perspective view which looked at the carriage from the apparatus back diagonally upward. The perspective view which shows the state in which a carriage is located in a left side edge part. FIG. 6 is a perspective view of a state where the carriage is positioned slightly on the home position side from the left end portion. The perspective view which shows a gear group and a rotary scale. The front view of a gear group. The top view which looked at the gear group and the carriage from the lower side. The schematic diagram which shows the variation of the position of the gearwheel with respect to a carriage. The schematic diagram which shows other embodiment of a carriage. The perspective view of a conveyance drive roller. Sectional drawing of these of a conveyance drive roller and an intermediate | middle support member. These perspective views of a main frame, a side frame, a guide frame, and a paper support member. The figure which shows the positional relationship of a conveyance drive roller and a conveyance driven roller. It is explanatory drawing which shows the principle of the paper rear end extrusion by a conveyance drive roller and a conveyance driven roller, (A) shows this embodiment, (B) shows a prior art.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings. However, the invention is not limited to the embodiment described below, and various modifications are possible within the scope of the invention described in the claims. Assuming that these are also included in the scope of the present invention, one embodiment of the present invention will be described below.

  FIG. 1 is an external perspective view of an ink jet printer (hereinafter referred to as “printer”) 1 which is an embodiment of a “recording apparatus” according to the present invention, and FIGS. 4 is a side sectional view showing a paper conveyance path of the printer 1, and FIGS. 5 and 6 are partially enlarged views of FIG.

  7 is a plan view of the carriage 17 as viewed from above, FIG. 8 is a plan view of the carriage 17 as viewed from below, FIG. 9 is a perspective view of the carriage 17 as viewed from diagonally above the apparatus, and FIG. FIG. 11 is a perspective view of the carriage 17 as viewed obliquely from the upper rear of the apparatus, FIG. 12 is a perspective view of the carriage 17 positioned at the left end, and FIG. It is a perspective view in the state where is located in the home position side a little from the left end part. 14 is a perspective view showing the gear group 33 and the rotary scale 45, FIG. 15 is a front view of the gear group 33, and FIG. 16 is a plan view of the gear group 33 and the carriage 17 as viewed from below.

  17 is a schematic diagram showing variations in the position of the gear with respect to the carriage 17, FIG. 18 is a schematic diagram showing another embodiment of the carriage, FIG. 19 is a perspective view of the transport driving roller 16, and FIG. These sectional views of the sheet support member 22 and the intermediate support member 50, FIG. 21 is a perspective view of the main frame 8, the side frames 9, 10, the guide frame 13, and the sheet support member 22, and FIG. FIG. 23 is a diagram illustrating the positional relationship between the transport driven roller 15 and the transport driven roller 15, FIG. 23 is an explanatory diagram illustrating the principle of sheet trailing edge extrusion by the transport drive roller 16 and the transport driven roller 15, and FIG. B) shows the prior art.

  In the xyz orthogonal coordinate system shown in each drawing, the x direction and the y direction are horizontal directions, of which the x direction is a direction (paper width direction) orthogonal to the paper transport direction, It is also the direction of movement of the carriage 17 (main scanning direction). In addition, the y direction is the paper transport direction and is also the apparatus depth direction. Furthermore, the z direction is the direction of gravity and is also the device height direction.

  Hereinafter, the overall configuration of the printer 1 will be described with reference to FIGS. The printer 1 is a so-called serial type ink jet printer that completes recording by alternately performing a recording operation and a sheet conveying operation, and is configured in a small size in consideration of portability. In FIG. 1, reference numeral 28 denotes a housing made of a resin material that constitutes the appearance of the apparatus, reference numeral 29 denotes an upper cover that is also formed from a resin material, and reference numeral 30 denotes a front cover that is also formed from a resin material. Show. The upper cover 29 and the front cover 30 are integrally formed, and when opened, an operation panel (not shown) and a paper feed port (not shown) appear on the upper surface of the apparatus, and a paper discharge port appears on the front surface of the apparatus. It has become. Reference numeral 30 a is an operation lever that unlocks the front cover 30.

  The apparatus main body 2 shown in FIG.2 and FIG.3 comprises the inner side of the housing | casing 28 mentioned above. The apparatus main body 2 has a skeleton composed of a plurality of frames. Specifically, the main frame 8, the side frame 9, the side frame 10, the sub frame 11, the guide frame 12, and the guide frame 13 are configured (details will be described later).

  At the rear of the apparatus, there is a paper feed port 3 on which recording paper (mainly cut sheet paper: hereinafter referred to as “paper P”) as an example of a medium can be set, and a plurality of sheets set in the paper feed port 3 are provided. The paper P is supported in an inclined posture by the hopper 4 and a paper support (not shown) located above the hopper 4.

  In FIG. 4, the hopper 4 swings around a swing fulcrum (not shown) to move the supported paper P forward and backward with respect to the feeding roller 5. The uppermost one of the set sheets P is brought into contact with the feeding roller 5 as the hopper 4 moves up, and is fed downstream by the rotation of the feeding roller 5.

  Downstream of the feeding roller 5, a sheet conveying unit including a conveyance driving roller 16 and a conveyance driven roller 15 is provided, and the sheet P is conveyed below the inkjet recording head 21 by these rollers. The conveyance drive roller 16 is rotationally driven by a motor 32 (FIGS. 15 and 16) as a drive source. The transport driven roller 15 is supported by the roller support member 14 so as to be freely rotatable, and is pressed toward the transport drive roller 16 by an urging means (not shown) that applies a pressing force to the roller support member 14. Then, it is rotated in contact with the conveyed paper P. The transport driving roller 16 is formed of a metal solid shaft or a metal hollow shaft, and the transport driven roller 15 is formed of a resin material (for example, POM (polyoxymethylene)). The transport driving roller 16 and the transport driven roller 15 will be described in detail later.

  The ink jet recording head 21 is provided on the carriage 17. The carriage 17 is mounted with the ink cartridge 20 and reciprocates in the paper width direction (x direction) by receiving power from the motor 47 (FIGS. 2 and 3). . In the present embodiment, the right end of FIGS. 2 and 3 is the home position of the carriage 17 in the movement region (movement range) of the carriage 17. Here, the home position means a standby position of the carriage 17 when not printing or when the power is turned off.

  Hereinafter, the movement direction of the carriage 17 when the carriage 17 moves from the right end (home position) to the left end is referred to as the second direction, and the movement direction of the carriage 17 when the carriage 17 moves from the left end to the right end is the first direction. The direction.

  Subsequently, the carriage 17 has a box-shaped carriage main body 18 and a casing, and the ink cartridges 20 </ b> A and 20 </ b> B are mounted inside the carriage main body 18. Ink is supplied from the ink cartridges 20 </ b> A and 20 </ b> B to the inkjet recording head 21. The ink cartridges 20A and 20B are detachable with respect to the carriage main body 18. In FIGS. 7 and 9 to 11, reference numerals 19A and 19B denote levers for releasing the lock of the ink cartridges 20A and 20B with respect to the carriage main body 18, respectively. Show.

  In this embodiment, the carriage 17 is a so-called on-carriage type in which the ink cartridges 20A and 20B are mounted. However, the ink cartridges 20A and 20B are provided independently from the carriage 17, and the ink cartridges 20A and 20B and the recording head 21 are provided. The so-called off-carriage type may be connected to each other by an ink tube.

  In FIG. 4, the carriage body 18 has a first supported portion 18a on the front side of the apparatus and a second supported portion 18b on the rear side of the apparatus. The first supported portion 18 a is supported by the guide frame 13, and the second supported portion 18 b is supported by the guide frame 12. That is, the carriage 17 is supported by the guide frame 13 and the guide frame 12. The first supported portion 18 a is supported by the guide frame 13 and slides on the guide frame 13.

  Similarly, the second supported portion 18 b is supported by the guide frame 12 and slides on the guide frame 12. Further, the guide frame 12 defines the position of the carriage 17 in the y direction. That is, the guide frame 12 guides the carriage 17 in the main scanning direction. The first supported portion 18a, the second supported portion 18b, and the guide frames 12 and 13 will be described in detail later.

  Subsequently, a paper support member 22 that supports the paper P is provided at a position facing the ink jet recording head 21, and the paper support member 22 defines a gap between the paper P and the ink jet recording head 21. On the downstream side of the inkjet recording head 21 and the paper support member 22, a discharge driving roller 25 and a discharge driven roller 26 for discharging the recorded paper P are provided. Reference numeral 25a denotes a rotation shaft of the discharge drive roller 25, and a plurality of discharge drive rollers 25 are provided at appropriate intervals along the axial direction of the rotation shaft 25a (see FIGS. 2 and 3). Reference numeral 24 denotes a regulating roller that regulates sheet floating.

  Next, the frame constituting the skeleton of the apparatus main body 2 will be described. 2, 3, and 21, the main frame 8, the sub frame 11, and the guide frames 12 and 13 have a shape extending in the paper width direction, and the side frames 9 and 10 have a shape extending in the paper conveyance direction. . 3 and 21 show a state where the guide frame 13 is exposed by removing the subframe 11 from the state of FIG.

  The main frame 8 extends in the vertical direction as shown in FIG. 4 in a cross-sectional view, has an upper portion bent in an L shape on the rear side of the apparatus, and a lower portion bent in an L shape on the front side of the apparatus. The shape is different. The main frame 8 is provided with a sheet feeding means including the hopper 4 and the feeding roller 5, and various types such as a motor 47 for driving the carriage 17 and a roller support member 14 for supporting the transport driven roller 15. The components are assembled.

  As shown in FIG. 4, the guide frame 12 extends in the vertical direction in a cross-sectional view and has a lower portion bent at the front side of the apparatus, then bent upward, and then bent toward the rear side of the apparatus. It is made. More specifically, in FIG. 5, reference numeral 12 a indicates a portion extending in the vertical direction in the sectional view of the guide frame 12 (hereinafter “vertical portion 12 a”), and reference symbol 12 b indicates a portion extending in the horizontal direction (hereinafter “horizontal portion 12 b”). ), 12c indicates a portion extending in the vertical direction (hereinafter, “second vertical portion 12c”), and 12d indicates a portion extending in the horizontal direction (hereinafter, “second horizontal portion 12d”). By thus forming a shape like a ridge in a cross-sectional view, the rigidity of the guide frame 12 in the longitudinal direction (paper width direction) is improved.

  Here, the upper surface 12e of the horizontal portion 12b of the guide frame 12 serves as a sliding surface on which a slider 18c (see also FIGS. 8 and 10) provided on the carriage body 18 slides. The carriage body 18 is provided with sliders 18d and 18e. Of these, the slider 18d is provided so as to be able to advance and retreat relative to the slider 18e and is urged toward the slider 18e. Thus, the second vertical portion 12c is sandwiched between the slider 18d and the slider 18e. As the carriage 17 moves, the sliders 18d and 18e slide with the second vertical portion 12c. Reference numeral 12f indicates a sliding surface on which the slider 18d slides, and reference numeral 12g indicates a sliding surface on which the slider 18e slides. Therefore, it is preferable that these surfaces of the sliding surfaces 12e, 12f, and 12g are formed smoothly.

  On the other hand, the guide frame 13 provided on the front side of the apparatus extends in the horizontal direction as shown in FIG. 4 in a cross-sectional view, and the end part on the front side of the apparatus is bent upward, and then bent horizontally on the rear side of the apparatus. It is shaped like a cocoon. More specifically, in FIG. 6, reference numeral 13 a indicates a portion extending in the horizontal direction in the sectional view of the guide frame 13 (hereinafter “horizontal portion 13 a”), and reference numeral 13 b indicates a portion extending in the vertical direction (hereinafter “vertical portion 13 b”). ), Reference numeral 13c indicates a portion extending in the horizontal direction (hereinafter, “second horizontal portion 13c”). Thus, by forming a shape like a ridge in a cross-sectional view, the rigidity of the guide frame 13 in the longitudinal direction (paper width direction) is improved.

  The upper surface (reference numeral 13d) of the horizontal portion 13a in the guide frame 13 becomes a sliding surface on which the first supported portion (slider) 18a (see also FIGS. 8 and 10) provided on the carriage 17 slides. . Accordingly, the sliding surface 13d is preferably formed smoothly.

  Next, returning to FIGS. 2, 3, and 21, the side frames 9 and 10 are joined to the end portions of the guide frames 12 and 13, respectively, and the conveyance drive roller 10 and the discharge drive roller described with reference to FIG. 2. Various elements constituting the sheet conveyance path such as 25 and the sheet supporting member 22 are assembled. As shown in FIG. 21, the left end 22 a of the paper support member 22 is fixed to the side frame 10 with screws (not shown), and the right end 22 b is fixed to the side frame 9 with screws 52 and 52. That is, the x-direction end of the paper support member 22 is supported by the side frames 9 and 10.

  Further, the sheet support member 22 is fixed to the main frame 8 with screws 51 at an intermediate portion 22c slightly closer to the center than the right end portion 22b. That is, the sheet support member 22 is supported at the x-direction end by the side frames 9 and 10 and is also supported by the main frame 8 in the meantime. Thereby, the bending (sinking) of the paper support member 22 in the x direction is effectively prevented. The function of the paper support member 22 will be further described later.

  Next, the carriage 17 (carriage body 18) according to this embodiment will be described with reference to FIG. As described above, the carriage 17 has a box-like carriage body 18 that forms a casing. In FIG. 9, reference numeral 18 h is a side face on the second direction side among the side faces constituting the periphery of the carriage body 18 (hereinafter referred to as “left side face”), and in FIG. 10, reference numeral 18 g is a side face on the first direction side. Yes (hereinafter referred to as “right side”).

  Further, in FIGS. 7 to 9 and 11, reference numeral 18 f denotes a protruding portion that protrudes in the second direction (the direction opposite to the home position of the carriage 17). The protruding portion 18f is a portion of the area A shown in FIGS. 7 and 8 in the carriage body 18, and in the present embodiment, means a portion protruding from the second supported portion 18b in the second direction. .

  More specifically, in FIG. 8, a straight line Cu is a line parallel to the y direction passing through an intermediate position between two sliders 18c and 18c arranged at a predetermined interval in the carriage movement direction, and the range Ws is a support means. A supported region in which the second supported portion 18b is supported by the guide frame 12 is shown. The carriage body 18 has an asymmetric shape in the carriage movement direction (x direction) with respect to the straight line Cu passing through the center position of the supported region Ws by forming the protrusion 18f.

  The symbol At is a triangular area surrounded by a straight line passing through the two sliders 18c, 18c and the first supported portion (slider) 18a. The center of gravity of the carriage 17 is the area At in plan view. Located inside.

  Next, a belt clamp portion 18k is provided on the rear side of the carriage body 18 as shown in FIG. The belt clamp portion 18 k is a portion that clamps (grips) the endless belt 48, and the belt clamp portion 18 k receives driving force from the endless belt 48. The endless belt 48 is stretched over the entire carriage movement region, operates by receiving the power of the motor 47 (FIGS. 2 and 3), and moves the carriage 17.

  Next, the gear group 33 as a power transmission mechanism that transmits the power of the motor 32 (FIGS. 15 and 16) to the transport drive roller 16 and the discharge drive roller 25 that constitute the transport means for transporting the paper P will be described. . The motor 32 is provided on the rear side in the apparatus front-rear direction, and the gear group 33 includes a transport drive roller 16 located in the center in the apparatus front-rear direction and a discharge drive roller 25 (rotation thereof) located on the front side in the apparatus front-rear direction. A plurality of gears are provided to transmit power to the shaft 25a).

  Each gear constituting the gear group 33 is provided on the side frame 10, and more specifically, provided on the outside of the side frame 10 (outside of the apparatus). The gear group 33 includes gears 34, 35, 36, 37, 38, 39, 40, and 41 in order from the motor 32 side as shown in FIGS. The gear 34 is a gear provided on the rotating shaft of the motor 32, and the gear 37 is a gear (first roller driving gear) provided on the shaft end of the transport driving roller 16 as the first roller. Is a gear (second roller driving gear) provided at the shaft end of the discharge driving roller 25 (its rotating shaft 25a) as the second roller. The gear group 33 transmits power to the discharge drive roller 25 (its rotation shaft 25a) via the gear 37.

  In addition to the gear 37, a rotary scale 45 is provided at the shaft end of the transport driving roller 16 (FIGS. 13 and 14). The rotary scale 45 constitutes rotation detection means 43 that detects the rotation of the transport drive roller 16, and the detection unit 44 (FIG. 16) that detects the rotation of the rotary scale 45 sandwiches the outer peripheral portion of the rotary scale 45. Is provided. The rotary scale 45 and the detection unit 44 constitute a rotation detection unit 43, and a control unit (not shown) of the printer 1 rotates the conveyance drive roller 16 and the discharge drive roller 25 based on a detection signal from the rotation detection unit 43. The amount and direction of rotation can be grasped.

12 and 16 show the state where the carriage 17 is located at the end portion in the second direction. As shown in the drawing, among the gears constituting the gear group 33, in the present embodiment, the gears 38 and 39 are entirely located on the lower side of the carriage 17, and some of the gears 37 and 40 are located on the lower side of the carriage 17. Located in.
In this way, at least a part of the gear group 33 is located under the carriage 17 in the state of moving to the end portion in the second direction, so that the gear group 33 enters the area necessary for the movement of the carriage 17. It becomes a form and can suppress the width dimension of an apparatus by this. In addition, since the width of the apparatus can be suppressed even if the width of the carriage 17 is secured, the volume of the carriage 17, that is, the volumes of the ink cartridges 20A and 20B can be secured.

In the present embodiment, the carriage 17 includes the protruding portion 18f protruding in the second direction, so that the volume of the carriage 17 can be secured by the protruding portion 18f and the carriage 17 is moved to the end portion in the second direction. Since at least a part of the gear group 33 is positioned below the protrusion 18f of the carriage 17, an increase in the lateral width of the apparatus can be suppressed. Further, since the carriage volume can be secured without increasing the carriage body 18 in the height direction, an increase in the height of the apparatus can also be suppressed.
Since the ink cartridge 20B occupies the space including the protruding portion 18f in the carriage 17, the ink capacity in the ink cartridge 20B can be ensured.

  Moreover, in this embodiment, the rotary scale 45 which comprises the rotation detection means 43 which detects rotation of the conveyance drive roller 16 as a 1st roller is formed smaller in diameter than the gear 37 as a 1st roller drive gear. Thereby, especially the rotary scale 45 can be protected from the external pressure from above the apparatus. A rotary scale 45 is provided on the gear 37 in the first direction (side frame 10 side). Therefore, the detection unit 44 that reads the rotary scale 45 is also disposed between the gear group 33 and the side frame 10. Therefore, it is possible to avoid the detection unit 44 being disposed on the outermost side (outside in the carriage movement direction) of the apparatus main body, and to suppress an increase in dimensions of the apparatus main body (dimension in the carriage movement direction).

  In addition, the rotary scale 45 is weak in strength, and the detection accuracy is easily lowered by a slight distortion, which easily leads to a decrease in recording quality. However, in the present embodiment, the rotary scale 45 is provided on the side in the first direction (side of the side frame 10) with respect to the gear 37 as the first roller driving gear, so that the rotary scale 45 is rotated from the external pressure from the side of the apparatus. The scale 45 and the detection unit 44 can be protected.

  In addition, the side frame 10 that supports the transport driving roller 16 is formed with a convex portion 10a that forms an arc shape having a diameter larger than the diameter of the rotary scale 45 as shown in FIG. Therefore, the convex portion 10 a functions as a shielding wall with respect to the rotary scale 45, and the ink mist can be prevented from adhering to the rotary scale 45.

  The carriage body 18 is formed with a recess 18j that avoids the protrusion 10a when the carriage 17 is positioned at the end in the second direction (FIG. 11). That is, when the carriage 17 is positioned at the end in the second direction (the state shown in FIG. 12), the convex portion 10a enters the concave portion 18j. Accordingly, it is not necessary to set the position of the side frame 10 to the outside in order to secure a moving area of the carriage 17 (in order to prevent interference between the carriage body 18 and the side frame 10), and an increase in the lateral width of the apparatus is suppressed. be able to.

  The embodiment described above is an example, and it goes without saying that the present invention is not limited to the above embodiment. For example, FIG. 17A is a diagram schematically illustrating the above-described embodiment. When the carriage body 18 moves in the direction of the arrow from the position indicated by the two-dot chain line and is positioned at the end, the gear 37 is It completely enters the lower side of the carriage body 18 in the carriage movement direction (x direction). However, the present invention is not limited to this configuration, and as shown in FIG. 17B, a part of the gear (reference numeral 37 ′) enters the lower side of the carriage body 18 in the carriage movement direction (x direction). Also good. A broken line indicated by a symbol Ln is the position of the left side surface of the carriage body 18. Reference numeral 18 m denotes a recess formed in the lower left portion of the carriage body 18. The recess 18m is a recess formed below the protrusion 18f by the protrusion 18f described above.

  Also, the carriage body 18 ′ shown in FIG. 18 has a symmetrical shape in the carriage movement direction (x direction) unlike the above-described embodiment. That is, the recess 18m and the recess 18n on the opposite side are formed in the same size. When the carriage body 18 ′ having such a shape is positioned at the end in the moving direction, the gear 37 can be configured to enter the recess 18 m.

  In addition, the following embodiments can also be employed. For example, in the present embodiment, the carriage 17 is supported by the guide frames 12 and 13 and guided in the moving direction, but may be supported by the shaft and guided in the moving direction.

  Subsequently, the transport driving roller 16 and the transport driven roller 15 will be described in more detail with reference to FIG. In FIG. 19, the transport drive roller 16 includes a high friction layer 16a in which wear-resistant particles are substantially uniformly dispersed on the outer peripheral surface of a shaft body (metal central shaft or metal hollow shaft) extending in the paper width direction. The ends are supported by side frames 9, 10 (FIG. 2).

  The high friction layer 16a is not formed in the intermediate portion of the transport driving roller 16, and the intermediate portion is supported by the intermediate support member 50 as shown in FIGS. By supporting not only the both ends of the conveyance drive roller 16 but also the intermediate portion by the intermediate support member 50, it is possible to suppress the deflection of the conveyance drive roller 16 and to ensure good sheet conveyance accuracy.

  The intermediate support member 50 is provided on the paper support member 22, and reference numeral 22 d in FIG. 20 is a support portion that supports the intermediate support member 50 in the paper support member 22. In this way, the intermediate support member 50 that supports the intermediate portion of the transport driving roller 16 is provided (supported) on the paper support member 22, so that the paper support member 50 bends in the x direction (sink in the center). ) And the degree thereof, and the form and the degree of bending (sinking of the central portion) of the transport drive roller 16 can be made substantially equal.

  Accordingly, the relative positional relationship between the paper support member 22 and the transport driving roller 16 does not vary in the x direction (paper width direction), that is, the paper posture is stable in the x direction (paper width direction). , Deterioration of recording quality can be suppressed.

  As described above, as described above with reference to FIG. 21, the sheet support member 22 is supported at the x-direction end portions by the side frames 9 and 10, and at the intermediate portion 22c therebetween, the main frame 8 is also supported. Therefore, the sheet support member 22 is effectively prevented from bending (sinking) in the x direction. As a result, the bending (sinking of the central portion) of the transport driving roller 16 can be effectively suppressed, and better recording quality can be obtained. In addition, the gap between the recording head 21 and the paper P is also stable in the x direction (paper width direction), and a reduction in recording quality can be suppressed.

  Next, FIG. 22 is a diagram illustrating a positional relationship between the transport driving roller 16 and the transport driven roller 15. Reference sign Q1 indicates the axial center position of the transport driven roller 15, and reference sign Q2 indicates the axial center position of the transport drive roller 16. Reference symbol T indicates the contact position between the transport driving roller 16 and the transport driven roller 15. Reference symbol Lv indicates a vertical line passing through the axial center position Q2, reference symbol Lp indicates a straight line passing through the axial center position Q1 and the axial center position Q2, and reference symbol Lh indicates a horizontal line passing through the contact position T. A symbol α indicates an angle formed by the vertical line Lv and the straight line Lp. Reference sign d1 indicates the diameter of the transport driven roller 15, and reference sign d2 indicates the diameter of the transport drive roller 16.

  In this embodiment, the diameter d1 of the conveyance driven roller 15 is set larger than the diameter d2 of the conveyance driving roller 16. Further, by setting the angle α to 0 ° <α <90 °, the feeding direction of the paper P fed from between the transport driving roller 16 and the transport driven roller 15 is obliquely below as shown by the arrow Df. The sheet P sent out from the direction between the conveyance driving roller 16 and the conveyance driven roller 15 is pressed against the sheet supporting member 22 (FIG. 4), thereby suppressing the sheet floating at the position facing the recording head 21. Good recording results can be obtained.

Hereinafter, an effect obtained by setting the diameter d1 of the transport driven roller 15 to be larger than the diameter d2 of the transport driving roller 16 will be described with reference to FIG. In FIG. 23, for convenience of explanation, the angle α shown in FIG. 22 is set to zero, but in reality, a predetermined angle α is set as shown in FIG.
In FIG. 23A showing the present embodiment, reference numeral Cu denotes a corner portion pushed out by the transport driven roller 15 in the rear end of the paper, and reference sign Cd denotes a corner pushed out by the transport driving roller 15 in the rear end of the paper. Shows the part.

  The transport driven roller 15 is pressed toward the transport drive roller 16, that is, the paper P is pressed between the transport drive driven roller 15 and the transport drive roller 16. Receives extrusion force from the roller. Reference numeral F1 indicates an extrusion force that the conveyance driven roller 15 applies to the rear end corner portion Cu, and reference numeral F2 indicates an extrusion force that the conveyance drive roller 16 applies to the rear end corner portion Cd. In this embodiment, the pushing force F2 due to the relatively small diameter conveying driving roller 16 is larger than the pushing force F1 due to the relatively large diameter conveying driven roller 15.

  Here, when the paper trailing edge is pushed out from between the conveyance driven roller 15 and the conveyance driving roller 16, the rotation R2 of the conveyance driven roller 15 is free rotation, and the rotation acts to push the paper trailing edge vigorously. To do. However, since the transport driving roller 16 is connected to a drive source and cannot be freely rotated, the rotation R1 of the transport driving roller 16 pushes out the rear end of the sheet with a greater force than the rotation R2 of the transport driven roller 15. Does not work.

  In this embodiment, such a property is utilized, and the conveyance driven roller 15 that acts to push out the trailing edge of the paper vigorously has a diameter larger than that of the conveyance driving roller 16 so that the pushing force F1 accompanying the pressing becomes relatively small. (D1> d2). Accordingly, the kicking phenomenon can be appropriately suppressed with a simple configuration.

  FIG. 23B is a diagram showing a conventional technique, that is, a case where the diameter of the transport driven roller 15 ′ is set smaller than the diameter of the transport drive roller 16 ′ for comparison with the present embodiment. . In this case, the pushing force F1 is larger than the pushing force F2 as shown in the drawing. Accordingly, the transport driven roller 15 that rotates to freely push out the rear end of the paper (freely rotatable) pushes out the rear end of the paper with a relatively large pushing force F1, thereby causing the kicking phenomenon to be remarkable. .

  By setting the diameter d1 of the transport driven roller 15 to be larger than the diameter d2 of the transport drive roller 16, the influence of a decrease in the assembly accuracy of the apparatus can be reduced. That is, as described with reference to FIG. 22, the angle α is set, and the feeding direction of the paper P sent out from between the transport driving roller 16 and the transport driven roller 15 is oblique as shown by the arrow Df. Look down. This angle α is important from the viewpoint of obtaining good recording quality.

  However, when the position of the transport driven roller 15 is moved back and forth in the horizontal direction due to a decrease in the assembly accuracy of the transport driven roller 15, the angle α also changes accordingly. The change rate of the angle α increases as the diameter d1 of the transport driven roller 15 decreases. However, in the present embodiment, the diameter d1 of the transport driven roller 15 is set to be large. Variations in the angle α are suppressed, and good recording quality can be obtained.

DESCRIPTION OF SYMBOLS 1 Inkjet printer, 2 apparatus main body, 3 paper feeding port, 4 hopper, 5 feeding roller, 8 main frame, 9 side frame, 10 side frame, 11 sub frame, 12 guide frame, 12a vertical part, 12b horizontal part, 12c 2nd vertical part, 12d 2nd horizontal part, 12e sliding surface, 12f sliding surface, 12g sliding surface, 13 guide frame, 13a horizontal part, 13b vertical part, 13c 2nd horizontal part, 13d sliding surface, 14 roller support member, 15 transport driven roller, 16 transport drive roller, 17 carriage, 18 carriage body, 18a first supported part (slider), 18b second supported part, 18c, 18d, 18e slider, 18f projecting part, 18g right side, 18h left side, 18j recess, 18k belt clan 19A, 19B Unlocking lever, 20A, 20B Ink cartridge, 21 Recording head, 22 Paper support member, 24 Guide roller, 25 Ejection drive roller, 25a Rotating shaft, 26 Ejection driven roller, 28 Housing, 29 Upper cover , 30 Front cover, 32 Motor (conveyance means), 33 Gear group, 34 to 41 gears, 43 Rotation detection means, 44 Detection part, 45 Rotary scale, 47 Motor (carriage drive), 48 Endless belt, 50 Intermediate support member , P Recording paper

Claims (11)

A recording head for recording by discharging ink onto a medium;
A carriage provided with the recording head and movable in a first direction and a second direction opposite to the first direction;
Support means for supporting the carriage;
A medium support member for supporting the medium, disposed at a position facing the recording head;
A driving roller provided on the upstream side of the recording head in the medium conveying path and configured to convey the medium to the recording head side and driven by a driving source;
A driven roller that is pressed toward the drive roller and rotates in contact with the medium;
A power transmission mechanism that transmits power of the drive source to the drive roller ,
The drive roller is formed by attaching particles to the outer peripheral surface of a solid shaft or a hollow shaft,
The driven roller is formed of a resin material,
The driven roller, diameter than the drive rollers rather large,
At least a portion of the power transmission mechanism is located under the carriage in a state of moving to an end in the second direction;
A recording apparatus. The recording apparatus according to claim 1, wherein a distance from a nip position between the driving roller and the driven roller to an upstream end of the recording head in a medium conveyance path is shorter than a length of the recording head.
A recording apparatus. 3. The recording apparatus according to claim 1, wherein the driven roller is positioned on the recording head side with respect to the medium to be transported, and the drive roller is on the medium support member side with respect to the medium to be transported. To position,
A recording apparatus. 4. The recording apparatus according to claim 3, wherein the axial center position of the driving roller is upstream from the axial center position of the driven roller, so that the driving roller is fed from between the driving roller and the driven roller. The medium is pressed against the medium support member;
A recording apparatus. 5. The recording apparatus according to claim 1, wherein the driving roller includes a single solid shaft or a hollow shaft extending in a medium width direction that is a direction intersecting a medium conveyance direction. The particles are attached to the outer peripheral surface,
A plurality of the driven rollers are arranged at intervals along the medium width direction with respect to the driving roller.
A recording apparatus. The recording apparatus according to claim 5, wherein the driving roller is not attached with the particles at a predetermined portion between both ends.
The drive roller is supported at both ends, and the predetermined portion is further supported by a support member.
A recording apparatus. A recording head for recording on a medium;
A drive roller driven by a drive source for conveying the medium to the side of the recording head;
A driven roller that is pressed toward the drive roller and rotates in contact with the medium;
A carriage provided with the recording head and movable in a first direction and a second direction opposite to the first direction;
Support means for supporting the carriage;
A power transmission mechanism that transmits power of the drive source to the drive roller,
The driven roller has a larger diameter than the driving roller,
At least a portion of the power transmission mechanism is located under the carriage in a state of moving to an end in the second direction;
A recording apparatus. The recording apparatus according to claim 1 , further comprising a discharge roller that discharges the medium on the downstream side of the recording head in the medium conveyance path,
The power transmission mechanism includes a first roller drive gear provided at a shaft end of the drive roller, and transmits power to the discharge roller via the first roller drive gear.
A rotary scale constituting rotation detection means for detecting rotation of the drive roller is provided on the first direction side with respect to the first roller drive gear;
A recording apparatus. The recording apparatus according to claim 8 , wherein a diameter of the rotary scale is smaller than a diameter of the first roller driving gear.
A recording apparatus. The recording apparatus according to claim 8 or 9 , further comprising a frame that supports the drive roller,
The frame is formed with a convex portion that is along the outer shape of the rotary scale and has an arc shape with a diameter larger than the diameter of the rotary scale.
A recording apparatus. The recording apparatus according to claim 10 , wherein the carriage is formed with a recess that avoids the protrusion when the carriage moves to an end in the second direction.
A recording apparatus.

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