JP6160175B2 - Recording device - Google Patents

Description

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

  A recording apparatus typified by a facsimile or a printer is provided with a conveying means for precisely feeding a recording sheet as a medium below the recording head. Usually, this conveying means is composed of a driving roller that is rotationally driven and a driving roller. And a pressing roller (driven roller) that presses the recording paper between them.

  The drive roller is constituted by a single shaft body, and both ends thereof are pivotally supported by bearings. However, the drive roller may be bent downward by the load received from the pressing roller. In addition, since the distance between the bearings becomes longer in a large printer, there is a possibility that the driving roller may bend downward due to its own weight. In order to solve such problems, conventionally, a configuration (medium support configuration) in which the driving roller is supported between the bearing portions at both ends has been employed (Patent Documents 1 and 2).

JP 2006-82439 A JP2011-136521A

  In the conventional configuration in which the driving roller as described above is supported between the bearings, although the remarkable deflection of the driving roller can be suppressed, the following problems are still unsolved. That is, when a support member (intermediate support member) that supports the drive roller between the bearing portions is fixedly attached to a frame or the like constituting the apparatus, high accuracy is required for positioning of the support member. Accordingly, the support member is configured to be displaceable along the direction against the load received from the driven roller, and is configured to suppress the deflection of the drive roller by urging the support member in the direction against the load. Is preferred.

  However, when the support member is configured to be displaceable in this way, the support member cannot be smoothly displaced unless a certain amount of play is provided in the paper transport direction. For this reason, with the rotation of the driving roller that is slightly bent, the support member also periodically moves in the paper transport direction, which may reduce the paper feed accuracy. Moreover, since the support member receives a force including a paper transport direction component from the drive roller as the drive roller rotates, a large force is required to restrain the support member from moving in the paper transport direction.

  Therefore, the present invention has been made in view of such a situation, and its purpose is to effectively suppress the movement of the driving roller (supporting member) in the paper transport direction while suppressing the bending of the driving roller, It is to obtain a good recording result.

  In order to solve the above problems, a recording apparatus according to a first aspect of the present invention includes a recording head for recording on a medium, a shaft body that conveys the medium by rotating, and a medium between the shaft body. A pressing roller that rotates while pressing, a plurality of bearings that rotatably support the shaft body, and a shaft that supports the shaft body against a load received from the pressing roller at a predetermined position between the plurality of bearings. , A support member provided so as to be displaceable along a direction against a load received from the pressing roller, a component in a direction against the load that the supporting member receives from the pressing roller, and an upstream direction of the medium conveyance direction And a biasing means for biasing the support member in a direction including the component.

  The support member that supports the shaft body against the load received from the pressing roller at a predetermined position between the plurality of bearings, the component in the upstream direction of the medium conveyance direction is generated by the rotation of the shaft body when the medium is conveyed downstream. Receive force in the direction of inclusion That is, the support member tends to move upstream in the medium conveyance direction. For this reason, if the support member is configured to be urged downstream in the medium conveyance direction to restrict movement of the support member in the medium conveyance direction, the urging force at that time is supported by the drive roller. There is a risk that the support member may not be effectively restrained in the medium transport direction, as a result of offsetting the force to move the member in the upstream direction.

  However, according to this aspect, since the support member is urged in the upstream direction in the medium conveyance direction, the driving roller is coupled with the force for moving the support member in the upstream direction in combination with the force with which the driving roller moves the support member in the medium conveyance direction. It is possible to reliably restrain the direction, and as a result, it is possible to obtain a good recording result by suppressing the periodic movement accompanying the rotation of the driving roller.

According to a second aspect of the present invention, in the first aspect, the support member includes a recess, and the shaft body is supported by two surfaces constituting an inner surface of the recess.
According to this aspect, since the support member includes the concave portion and the shaft body is supported by the two surfaces constituting the inner surface of the concave portion, the shaft body can be reliably supported in the concave portion without rattling. .

According to a third aspect of the present invention, in the second aspect, the concave portion is substantially V-shaped when viewed from the axial direction of the shaft body.
According to this aspect, since the concave portion is substantially V-shaped when viewed from the axial direction of the shaft body, the shaft body can be reliably supported in the concave portion without rattling.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the biasing means is constituted by a single spring.
According to this aspect, since the urging means is constituted by one spring, the urging means can be constituted at low cost.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the shaft body is a hollow shaft.
According to this aspect, since the shaft body is a hollow shaft, the shaft body can be reduced in weight, that is, the entire recording apparatus can be reduced in weight.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a plurality of the support members are provided at appropriate intervals along the axial direction of the shaft body.
According to this aspect, since a plurality of the support members are provided at appropriate intervals along the axial direction of the shaft body, it is possible to more reliably suppress the bending of the shaft body and to accompany the bending of the shaft body. Further, the periodic movement in the medium conveyance direction can be suppressed, and a better recording result can be obtained.

FIG. 2 is a perspective view illustrating an internal configuration of the printer according to the invention. It is a perspective view which shows the structure of a roller. FIG. 2 is a cross-sectional view illustrating an internal configuration of the printer according to the invention. FIG. 2 is a cross-sectional view illustrating an internal configuration of the printer according to the invention. It is a perspective view which shows the structure and cross section which support a supporting member. It is sectional drawing which shows the structure which supports a supporting member. It is a perspective view which shows the structure and cross section which support a supporting member. It is sectional drawing which shows the structure which supports a supporting member. It is a perspective view which shows the structure and cross section which support a supporting member. It is sectional drawing which shows the structure which supports a supporting member. It is sectional drawing which shows the cross section of the supporting member which supports the roller of a different diameter. FIG. 2 is a cross-sectional view illustrating an internal configuration of the printer according to the invention. It is a perspective view which shows the structure of a roller. FIG. 6 is a perspective view schematically showing a printer according to another embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an internal configuration of a printer 11 according to an embodiment of the present invention. FIG. 2 is a perspective view showing the configuration of the roller 31 and the roller 32.

  Note that the front-rear direction with respect to the printer 11 is illustrated with the Y-axis, the up-down direction is illustrated with the Z-axis, and the left-right direction is illustrated with the X-axis. In the X-axis direction, the upper left side in FIG. 1 is simply referred to as the left side, and the lower right side in FIG. 1 is simply referred to as the right side in the X-axis direction. Further, in the Y axis direction, the lower left side in FIG. 1 is simply referred to as a front side, and in the Y axis direction, the upper right side in FIG. 1 is simply referred to as a rear side. Furthermore, hereinafter, the upper side in FIG. 1 in the Z-axis direction is simply referred to as the upper side, and the lower side in FIG. 1 in the Z-axis direction is simply referred to as the lower side.

  FIG. 3 is a cross-sectional view showing an internal configuration of the printer 11, and is a cross-sectional view showing a cross section in a plane parallel to a plane defined by the Z axis and the Y axis. FIG. 4 is a cross-sectional view showing an internal configuration of the printer 11 and is a cross-sectional view showing a cross section in a plane parallel to a plane defined by the Z axis and the X axis.

  In the present embodiment, the printer 11 is an ink jet printer that is an example of a recording apparatus that records on a sheet as an example of a medium. The printer 11 includes a recording unit 21 (FIG. 3) that performs recording. The recording unit 21 includes a carriage 22 (FIG. 3) and a recording head 81 (FIG. 3). In this embodiment, the recording head 81 is mounted on the carriage 22 and the recording head 81 ejects ink as the carriage 22 moves. However, the present invention is not limited to this configuration, and the recording head is fixedly provided. A so-called line head type may be used.

  The printer 11 includes a roller 31, a roller 32, and base frames 33 and 34. The roller 31 is rotated counterclockwise in FIG. 3 about the axis in the X-axis direction by a drive unit (not shown) when transporting the paper forward (downward in the paper transport path: the same applies hereinafter). . The roller 32 is disposed so as to be in contact with the upper side of the roller 31, and is rotated clockwise in FIG. 3 about the axis in the X-axis direction by the roller 31 when the paper is conveyed forward. The roller 31 and the roller 32 sandwich the paper and feed the paper forward. In this case, the roller 31 is in contact with the lower surface of the paper, and the roller 32 is in contact with the upper surface of the paper. The base frame 33 is a structure that is a framework of the printer 11 and supports the roller 31 and a paper support portion 82 (described later).

  The roller 31 is formed in a cylindrical shape with metal. That is, the roller 31 is a hollow shaft. Since the roller 31 is a hollow shaft, the roller 31 can be reduced in weight, that is, the entire printer 11 can be reduced in weight. As shown in FIGS. 2 and 4, the high friction layer 51 is formed on the outer peripheral surface of the roller 31 that is in contact with the sheet to be conveyed (excluding the outer peripheral surface of the supported portion 53 that is in contact with the support member 54). Has been. The high friction layer 51 is formed of wear-resistant particles and a coating material that adheres and holds the wear-resistant particles to the outer peripheral surface of the roller 31.

  The bearings 52-1 and 52-2 rotatably support the roller 31. The bearing 52-1 pivotally supports the left side of the portion of the roller 31 that is in contact with the paper to be conveyed. The bearing 52-2 pivotally supports the right end of the roller 31. In addition, the high friction layer 51 is not formed in the outer peripheral surface of the outer peripheral surface of the roller 31 in the part pivotally supported by the bearings 52-1 and 52-2.

  In addition, a supported portion 53 located substantially in the center of the portion of the roller 31 that is in contact with the sheet to be conveyed is supported by the support member 54. Note that the high friction layer 51 is not formed on the outer peripheral surface of the supported portion 53.

  The roller 32 is made of a thermoplastic resin such as POM (polyoxymethylene). The roller 32 is rotatably supported at the front end portion of the support member 61. One end of the coil spring 62 is stopped at the rear end of the support member 61. The other end of the coil spring 62 is fixed to the base frame 34. The coil spring 62 applies an upward force to the rear end of the support member 61.

  A shaft support portion 63 that pivotally supports the support member 61 so as to be able to swing is provided at substantially the center in the longitudinal direction of the support member 61. Since the support member 61 is pivotally supported by the shaft support portion 63 and an upward force is applied to the rear end portion of the support member 61 by the coil spring 62, the front side of the support member 61 on which the roller 32 is provided. A downward force is applied to the end of the roller, and the roller 32 is pressed against the roller 31 from above.

  That is, the roller 31 conveys the paper by rotating. The roller 32 rotates while pressing the paper between the rollers 31.

  The support member 54 is made of a thermoplastic resin such as polyoxymethylene or a metal. The support member 54 supports the supported portion 53 of the roller 31. That is, the support member 54 supports the roller 31 against a load received from the roller 32 at a predetermined position between the bearings 52-1 and 52-2.

  On the upper surface of the support member 54, a recess 71 having a substantially V shape when viewed from the X-axis direction is provided. In the support member 54, the front surface 72-1 and the rear surface 72-2 of the recess 71 are in contact with the outer peripheral surface of the supported portion 53 of the roller 31 to support the roller 31. The surface 72-1 and the surface 72-2 are flat surfaces that are not bent. Thus, the support member 54 supports the roller 31 with the surfaces 72-1 and 72-2 that constitute the inner surface of the recess 71.

  As described above, the support member 54 includes the concave portion 71 and supports the roller 31 by the surfaces 72-1 and 72-2 constituting the inner surface of the concave portion 71. Therefore, the roller 31 can be reliably supported in the concave portion 71 without rattling. it can. Moreover, since the recessed part 71 comprises substantially V shape seeing from the axial direction of the roller 31, it can support the roller 31 in the recessed part 71 more reliably, without rattling. As described above, since the support member 54 supports the supported portion 53 of the roller 31, the deflection of the roller 31 can be suppressed.

  As shown in FIG. 3, the paper sandwiched between the rollers 31 and 32 is sent forward in the conveyance path indicated by the arrow A in FIG. 3. A recording head 81 is provided on the upper side of the conveyance path, and a paper support unit 82 is provided on the lower side thereof. That is, the sheet sandwiched between the roller 31 and the roller 32 is fed forward in the conveyance path between the recording head 81 which is an example of a recording unit and the sheet support unit 82.

  The recording head 81 performs recording on a sheet by ejecting ink onto the sheet supported by the sheet support unit 82. The paper support unit 82 is provided at a position facing the recording head 81 and keeps the distance between the paper and the recording head 81 at a predetermined length. The roller 83 feeds the paper recorded by the recording head 81 forward and discharges it from the printer 11.

■■■ First embodiment ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
Next, with reference to FIGS. 5 and 6, a first embodiment configured to support the support member 54 will be described. FIG. 5 is a perspective view showing a configuration for supporting the support member 54 in the first embodiment and a cross section thereof, which is a cross section in a plane parallel to a plane defined by the Z axis and the Y axis. FIG. 6 is a cross-sectional view of a configuration for supporting the support member 54 in the first embodiment, and is a cross-sectional view showing a cross section in a plane parallel to a plane defined by the Z axis and the Y axis.

  A coil spring 101 that constitutes an urging unit that urges the support member 54 is a coil spring in which a metal wire is spirally wound. The lower surface of the support member 54 is supported by one end of the coil spring 101. The other end of the coil spring 101 is supported by a support frame 35 (see FIG. 3). The support member 54 is provided so as to be displaceable in the Z-axis direction. That is, the support member 54 is provided so as to be displaceable along a direction against a load received from the roller 32. As shown by the arrow B in FIG. 6, an upward force is applied to the lower surface of the support member 54 by the coil spring 101. Thus, the coil spring 101 urges the support member 54 in the direction of the load that the support member 54 receives from the roller 32.

  The support frame 35 that supports the end of the coil spring 101 is provided on the subframe 36 (only a part of the subframe 36 is shown in FIG. 3). Here, the paper support portion 82 (FIG. 3) that defines the gap between the recording head 81 and the paper is supported by the base frame 33, but if the support frame 35 is supported by the base frame 33. The base frame 33 may be bent by the urging force of the coil spring 101. If the base frame 33 is bent, the gap between the recording head 81 and the paper may change and adversely affect the recording quality. However, since the support frame 35 that supports the end of the coil spring 101 is supported by the sub-frame 36 that is a member different from the base frame, the above-described problems can be avoided.

  Returning to FIG. 5 and FIG. 6, the coil spring 102 that constitutes the urging means for urging the support member 54 is a coil spring in which a metal wire is spirally wound, expands and contracts by a load, and is urged by its end. One end of the coil spring 102 is hooked on the rear surface of the support member 54. The other end of the coil spring 102 is fixed to the base frame 33. As indicated by an arrow C in FIG. 6, the coil spring 102 applies a backward force (upstream in the paper conveyance direction: the same applies hereinafter) to the rear surface of the support member 54. In this way, the rear surface of the support member 54 is pressed backward against the base frame 33. The roller 31 supported by the pressed support member 54 becomes a roller setting position (fixed position).

  Here, when the supporting roller 31 rotates counterclockwise in FIG. 6, it is supported by the frictional force between the surfaces 72-1 and 72-2 that support the roller 31 and the outer peripheral surface of the roller 31. The member 54 tends to move backward (to the right in FIG. 6). That is, the support member 54 tends to move upstream in the medium conveyance direction.

  Here, if the support member 54 is configured to restrict the movement of the support member 54 in the medium conveyance direction by urging the support member 54 in the downstream direction in the medium conveyance direction, the roller 31 moves the support member 54 in the upstream direction. As a result, the biasing force is canceled by the force to be moved, and as a result, the support member 54 may not be effectively restrained in the medium transport direction.

  However, in this embodiment, the coil spring 102 biases the support member 54 in the same direction as the direction in which the support member 54 tries to move due to the frictional force generated between the roller 31 and the surfaces 72-1 and 72-2. Therefore, even if the roller 31 rotates, backlash in the Y-axis direction does not occur between the support member 54 and the base frame 33. That is, since the support member 54 is urged in the upstream direction in the medium conveyance direction, coupled with the force that the roller 31 tries to move the support member 54 in the upstream direction, the support member 54 is moved in the medium conveyance direction. As a result, it is possible to reliably restrain, and as a result, it is possible to suppress the periodic movement accompanying the rotation of the roller 31 and obtain a good recording result. As described above, the coil spring 102 biases the support member 54 in the upstream direction in the sheet conveyance direction.

  As described above, the coil spring 101 and the coil spring 102 urge the support member 54 in a direction including the component in the direction of the load that the support member 54 receives from the roller 32 and the component in the upstream direction in the sheet conveyance direction. Therefore, while suppressing the deflection of the roller 31, the movement of the roller 31 (support member 54) in the paper transport direction can be effectively suppressed and a good recording result can be obtained.

■■■ Second embodiment ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
Next, with reference to FIG. 7 and FIG. 8, a second embodiment configured to support the support member 54 will be described. FIG. 7 is a perspective view showing a configuration for supporting the support member 54 in the second embodiment and a cross section thereof, which is a cross section in a plane parallel to a plane defined by the Z axis and the Y axis. FIG. 8 is a cross-sectional view of a configuration that supports the support member 54 in the second embodiment, and is a cross-sectional view showing a cross section in a plane parallel to a plane defined by the Z axis and the Y axis. 7 and 8, the same reference numerals are given to the same parts as those in the first embodiment shown in FIGS. 5 and 6, and the description thereof is omitted.

  A coil spring 111 constituting an urging means for urging the support member 54 is a coil spring in which a metal wire is spirally wound, expands and contracts by a load, and is urged by an end portion thereof. The coil spring 111 differs from the coil spring 102 described above in that the coil spring 102 is a tension coil spring, whereas the coil spring 111 is a compression coil spring.

  More specifically, the front surface of the support member 54 is pressed by one end of the coil spring 111. The other end of the coil spring 111 is fixed to the base frame 33. A backward force is applied to the front surface of the support member 54 by the coil spring 111 as indicated by an arrow D in FIG. Also in the second embodiment, since the coil spring 111 urges the support member 54 in the same direction as the direction of the frictional force of the rotating roller 31, the support member 54 and the base frame are rotated even when the roller 31 rotates. No play in the Y-axis direction occurs between In this way, the coil spring 111 biases the support member 54 in the upstream direction in the sheet conveyance direction.

  As described above, the coil spring 101 and the coil spring 111 urge the support member 54 in a direction including the component in the direction of the load that the support member 54 receives from the roller 32 and the component in the upstream direction in the sheet conveyance direction.

■■■ Third embodiment ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
Next, with reference to FIG. 9 and FIG. 10, a third embodiment configured to support the support member 54 will be described. FIG. 9 is a perspective view showing a configuration for supporting the support member 54 in the third embodiment and a cross section thereof in a plane parallel to a plane defined by the Z axis and the Y axis. FIG. 10 is a cross-sectional view of a configuration for supporting the support member 54 in the third embodiment, and is a cross-sectional view showing a cross section in a plane parallel to a plane defined by the Z axis and the Y axis. 9 and 10, the same reference numerals are given to the same parts as those in the first embodiment shown in FIGS. 5 and 6, and the description thereof is omitted.

  A coil spring 131 that constitutes an urging unit that urges the support member 54 is a coil spring in which a metal wire is spirally wound, expands and contracts by a load, and is urged by an end thereof. The coil spring 131 supports the support member 54 obliquely upward and rearward. In other words, the coil spring 131 supports the lower surface of the support member 54 and presses the front surface of the support member 54 backward. One end of the coil spring 131 presses the front and lower surfaces of the support member 54. By doing so, the rear surface of the support member 54 is pressed backward against the base frame 33.

  As indicated by an arrow E in FIG. 10, an upward and backward force is applied to the front surface and the lower surface of the support member 54 by the coil spring 131. One coil spring 131 urges the support member 54 in a direction including a component in the direction of the load that the support member 54 receives from the roller 32 and a component in the upstream direction of the sheet conveyance direction. Since it is comprised by the one coil spring 131, it can comprise more cheaply.

  A pair of rollers, that is, a roller 31 and a roller 32 nips the sheet and conveys the sheet in the Y direction. The pair of rollers conveys the sheet so as to press the sheet against the sheet support unit 82 (FIG. 3). To do. Thereby, the paper floating from the paper support portion 82 is suppressed, and an appropriate recording result can be obtained. For this reason, the positional relationship between the pair of rollers is such that the roller 32 is shifted with respect to the roller 31 so that the center of the roller is shifted to the downstream side in the transport direction (Y + side).

  Here, the roller 32 urges the roller 31, and this urging force has a −Z direction component and a −Y direction component. Accordingly, the support member 54 that supports the roller 31 is urged in the −Y direction, but there is no urging force until the support member 54 is brought into contact with the base frame 33. However, with the assistance of the coil spring 131, the support member 54 can be reliably brought into contact with the base frame 33.

In order to manufacture at a lower cost and to reduce the height of the printer 11, a roller 31 having a smaller diameter can be employed. In this case, since the recess 71 provided on the upper surface of the support member 54 is substantially V-shaped when viewed from the X-axis direction, it is illustrated in FIGS. 11A, 11B, and 11C. As shown, the support member 54 can support the rollers 31 of different diameters without changing its shape. As a result, it is not necessary to newly manufacture a mold for molding the support member 54, and it is not necessary to correct the mold.
The embodiment shown in FIG. 11 is applicable not only to the third embodiment but also to the first and second embodiments described above and other embodiments described later.

■■■ Fourth Embodiment ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
FIG. 12 is a cross-sectional view of the printer 11 according to the fourth embodiment, showing a cross section in a plane parallel to a plane defined by the Z axis and the Y axis. In FIG. 12, the same parts as those in the first embodiment shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

  The printer 11 of the fourth embodiment is provided with a roller 201 and a roller 202. When the paper is conveyed forward, the roller 201 is rotated in the clockwise direction in FIG. 12 about the axis in the X-axis direction by a drive unit (not shown). The roller 202 is disposed so as to be in contact with the lower side of the roller 201. When the paper is conveyed forward, the roller 201 is rotated counterclockwise in FIG. The roller 201 and the roller 202 sandwich the paper and feed the paper forward. In this case, the roller 201 is in contact with the upper surface of the paper, and the roller 202 is in contact with the lower surface of the paper. The base frame 33 is a structure that is a framework of the printer 11 and supports the roller 201 and the roller 202.

  The roller 201 is formed in a cylindrical shape from metal. A high friction layer (not shown) is formed on the outer peripheral surface of the roller 201 that is in contact with the sheet to be conveyed (excluding the outer peripheral surface of the portion that is in contact with the support member 203). This high friction layer is formed of wear-resistant particles and a coating material that adheres and holds the wear-resistant particles to the outer peripheral surface of the roller 201. The roller 201 is rotatably supported by two bearings (not shown). One bearing pivotally supports the left side of the portion of the roller 201 that is in contact with the sheet to be conveyed. The other bearing pivotally supports the right end of the roller 201. In addition, the high friction layer is not formed in the outer peripheral surface of the part supported by two bearings among the outer peripheral surfaces of the roller 201, respectively.

  In addition, a portion of the roller 201 that is located approximately in the center of the portion that is in contact with the sheet to be conveyed is supported by the support member 203.

  The roller 202 is made of a thermoplastic resin such as polyoxymethylene. The roller 202 is rotatably supported at the front end portion of the support member 206. One end of a coil spring (not shown) is stopped at the rear end of the support member 206. The other end of the coil spring is fixed to the base frame 33. The coil spring applies a downward force to the rear end of the support member 206.

  A shaft support portion 207 that pivotally supports the support member 206 is provided at substantially the center in the front-rear direction of the support member 206. Since the support member 206 is pivotally supported by the shaft support portion 207 and a downward force is applied to the rear end portion of the support member 206 by the coil spring, the front side of the support member 206 on which the roller 202 is provided is provided. An upward force is applied to the end, and the roller 202 is pressed against the roller 201 from below.

  That is, the roller 201 conveys the paper by rotating. The roller 202 rotates while pressing a sheet with the roller 201.

  The support member 203 is made of a thermoplastic resin such as polyoxymethylene or a metal. The support member 203 supports the roller 201 against a load received from the roller 202 at a predetermined position between the two bearings. On the lower surface of the support member 203, there is provided a recess 221 having a shape that is substantially the same as the V-shape inverted when viewed from the X-axis direction. The support member 203 supports the roller 201 by bringing the front surface 222-1 and the rear surface 222-2 of the recess 221 into contact with the outer peripheral surface of the roller 201. The surface 222-1 and the surface 222-2 are flat surfaces that are not bent. Thus, the support member 203 supports the roller 201 with the surfaces 222-1 and 72-2 which constitute the inner surface of the recess 221.

  As shown in FIG. 12, the sheet sandwiched between the roller 201 and the roller 202 is fed forward in the conveyance path indicated by the arrow A in FIG.

  The upper surface of the support member 203 is pressed by one end of the coil spring 204. The other end of the coil spring 204 is in contact with a frame not shown. The support member 203 is provided so as to be displaceable in the Z-axis direction. That is, the support member 203 is provided so as to be displaceable along a direction against a load received from the roller 202. A downward force is applied to the upper surface of the support member 203 by the coil spring 204 as indicated by an arrow F in FIG. As described above, the coil spring 204 biases the support member 203 so as to oppose the direction of the load that the support member 203 receives from the roller 202.

  One end of a coil spring (tensile coil spring) 205 is hooked on the rear surface of the support member 203. The other end of the coil spring 205 is fixed to a frame not shown. A backward force is applied to the rear surface of the support member 203 by the coil spring 205 as indicated by an arrow G in FIG. By doing so, the rear surface of the support member 203 is pressed backward against the base frame 33.

  When the supporting roller 201 is rotated in the clockwise direction in FIG. 12, the supporting member 203 is caused to face rearward (rightward in FIG. 12) by the frictional force between the roller 201 and the surfaces 222-1 and 222-2. ) Will tend to move to. Since the coil spring 205 biases the support member 203 in the same direction as this force, even if the roller 201 rotates, backlash in the Y-axis direction occurs between the support member 203 and the base frame 33. Can be reliably prevented.

  As described above, the coil spring 204 and the coil spring 205 that constitute the urging means that urges the support member 203 include the component in the direction of the load that the support member 203 receives from the roller 202, and the component in the upstream direction in the sheet conveyance direction. The supporting member 203 is urged in a direction including.

  In each of the embodiments described above, the support member that supports the roller is provided at one place between the bearings at both ends. However, the present invention is not limited to this, and a plurality of support members may be provided. FIG. 13 shows such an embodiment, and the roller 31 may be supported by the support members 54-1 to 54-3. FIG. 13 is a perspective view illustrating configurations of the roller 31 and the roller 32 of the printer 11 according to the fifth embodiment. In FIG. 13, the same parts as those of the first embodiment shown in FIG.

  Of the portions of the roller 31, the supported portion 53-2 located at substantially the center of the portion in contact with the sheet to be conveyed is supported by the support member 54-2. Of the portion of the roller 31, the supported portion 53-1 that is positioned approximately at the center between the position supported by the bearing 52-1 and the position of the supported portion 53-2 is supported by the support member 54-1. Of the portion of the roller 31, the supported portion 53-3 located at the approximate center between the position supported by the bearing 52-2 and the position of the supported portion 53-2 is supported by the support member 54-3. The high friction layer 51 is not formed on the outer peripheral surfaces of the supported portions 53-1 to 53-3.

  The support members 54-1 to 54-3 are formed in the same manner as the support member 54 and are supported in the same manner. The support members 54-1 to 54-3 support the supported portions 53-1 to 53-3, respectively. As described above, a plurality of support members 54-1 to 54-3 can be provided at appropriate intervals along the axial direction of the roller 31. Since a plurality of the supporting members 54-1 to 54-3 are provided at appropriate intervals along the axial direction of the roller 31, the bending of the roller 31 can be more reliably suppressed, and the bending of the roller 31 is accompanied. Periodic movement in the medium conveyance direction can be suppressed, and better recording results can be obtained.

  Although the printer 11 has been described as an example, the present invention is not limited to this, and can be applied to a recording apparatus such as a facsimile machine, a copier, or a multifunction machine. In addition, the coil spring 101, the coil spring 102, the coil spring 111, and the coil spring 131 have been described as being biased. An elastic body that can obtain an urging force can be employed.

  In summary, the printer 11 as an example of a recording apparatus is an example of a recording head 81 that is an example of a recording head that performs recording on a sheet that is an example of a medium, and a shaft that conveys the medium by rotating. Roller 31, roller 32 that is an example of a pressing roller that rotates while pressing a medium between shafts, and bearings 52-1 and 52-that are examples of a plurality of bearings that rotatably support the shaft. 2 and an example of a support member provided to be displaceable along a direction against a load received from the pressing roller, supporting the shaft body against a load received from the pressing roller at a predetermined position between the plurality of bearings. A coil that is an example of an urging unit that urges the support member in a direction that includes the support member 54, a component in a direction against the load received by the support member from the pressing roller, and a component in the upstream direction of the medium conveyance direction. It includes a value 101 and 102, a.

  The support member 54 that supports the roller 31 against the load received from the roller 32 at a predetermined position between the bearings 52-1 and 52-2 is rotated in the medium conveyance direction by the rotation of the roller 31 when conveying the paper downstream. A force is received in the direction including the upstream component. That is, the support member 54 tends to move upstream in the medium conveyance direction. For this reason, if the support member is configured to be urged downstream in the medium conveyance direction to restrict movement of the support member in the medium conveyance direction, the urging force at that time is supported by the drive roller. There is a risk that the support member may not be effectively restrained in the medium transport direction, as a result of offsetting the force to move the member in the upstream direction.

  However, according to the present embodiment, the support member 54 is urged in the upstream direction in the medium conveyance direction, so that the support member 54 is coupled with the force that the roller 31 tries to move the support member 54 in the upstream direction. Can be reliably restrained in the medium conveying direction, and as a result, the periodic movement associated with the rotation of the roller 31 can be suppressed and a good recording result can be obtained.

  The support member 54, which is an example of the support member, is provided with a recess 71, which is an example of the recess, and the shaft body is supported by the surfaces 72-1 and 72-2, which are examples of the two surfaces constituting the inner surface of the recess 71. it can. In this case, since the support member 54 includes the recess 71 and supports the roller 31 with the surfaces 72-1 and 72-2 constituting the inner surface of the recess 71, the roller 31 can be reliably supported without rattling in the recess 71. it can.

  The recessed part 71 which is an example of a recessed part can comprise a substantially V shape seeing from the axial direction of a shaft body. In this case, since the recess 71 is substantially V-shaped when viewed from the axial direction of the roller 31, the roller 31 can be reliably supported in the recess 71 without rattling.

  The urging means can be constituted by a coil spring 131 which is an example of one spring. In this case, since the urging means is constituted by one coil spring 131, the urging means can be constituted at low cost.

  The roller 31 which is an example of a shaft body can be a hollow shaft. Since the roller 31 is a hollow shaft, the roller 31 can be reduced in weight, that is, the entire printer 11 can be reduced in weight. The hollow shaft is more easily deformed than the solid shaft, but the presence of the support member 54 can effectively suppress deformation. Of course, even a solid axis has an effect of suppressing deformation.

  A plurality of support members 54-1 to 54-3, which are examples of the support members, can be provided at appropriate intervals along the axial direction of the shaft body. Since a plurality of the supporting members 54-1 to 54-3 are provided at appropriate intervals along the axial direction of the roller 31, the bending of the roller 31 can be more reliably suppressed, and the bending of the roller 31 is accompanied. Periodic movement in the medium conveyance direction can be suppressed, and better recording results can be obtained.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  For example, the supply source of ink that is liquid ejected from the recording head may be an ink cartridge mounted on the carriage, or an ink container provided outside the carriage. The ink container outside the carriage may be provided inside the casing constituting the appearance of the recording apparatus, or may be provided outside the casing. If the ink cartridge is mounted on the carriage, the ink capacity in the cartridge is limited. However, by providing an ink container outside the carriage, the ink capacity can be increased and recording can be performed more times. Is possible.

  When ink is supplied from the outside of the housing to the recording head, it is necessary to draw an ink supply tube for supplying ink inside the housing. Therefore, it is preferable that a hole or a notch is provided in the housing and the ink supply tube is passed through the hole or the notch. Alternatively, a boss or the like is set up so that the scanner unit or cover that can be opened and closed in the housing does not completely close to the housing, and the tube is placed inside the housing using the gap formed by the boss. You may be drawn around. By doing so, it is possible to ensure the supply of ink in the flow path of the ink supply tube.

  FIG. 14 is an example thereof, and is a perspective view schematically showing a printer according to another embodiment. In FIG. 14, reference numeral 500 denotes an ink jet printer, reference numeral 502 denotes a recording unit, reference numeral 503 denotes a scanner unit that can be opened and closed with respect to the recording unit 502, reference numeral 505 denotes an operation unit (on the front side of the apparatus), reference numeral 506 denotes an ink container, Reference numeral 507 denotes an ink supply tube for supplying ink from the ink container 506 to a recording head (not shown in FIG. 17). A boss (projection) 509 is provided on the top of the recording unit 502, and the boss 509 does not completely close the scanner unit 503 with respect to the recording unit 502, but forms a gap 508. .

  The ink supply tube 507 enters the inside of the printer through the gap 508, so that the scanner unit 503 is configured not to block the ink flow path of the ink supply tube 507. In this way, by using the ink container 506 provided outside the carriage, the ink capacity is increased, and a larger number of recordings can be performed.

  11 Printer, 31 and 32 Roller, 33 Base frame, 34 Subframe, 51 High friction layer, 52-1 and 52-2 Bearing, 53 and 53-1 to 53-3 Supported part, 54 and 54-1 to 54 -3 support member, 61 support member, 62 coil spring, 63 shaft support portion, 71 recess, 72-1 and 72-2 surface, 81 recording head, 82 paper support portion, 83 roller, 101, 102, 111, and 131 coil spring, 201 and 202 Roller, 203 Support member, 204 and 205 Coil spring, 206 Support member, 207 Shaft support, 221 Recess, 222-1 and 222-2

Claims (6)

A recording head for recording on a medium;
A base frame,
A shaft that is supported by the base frame and conveys the medium by rotating;
A pressing roller that rotates while pressing a medium with the shaft, and
A plurality of bearings rotatably supporting the shaft body;
A support member provided to be displaceable along a direction against a load received from the pressing roller, supporting the shaft body against a load received from the pressing roller at a predetermined position between the plurality of bearings;
A first biasing unit that is supported at one end by a frame different from the base frame and biases the support member at the other end in a direction including a component in a direction against the load that the support member receives from the pressing roller. When,
A second urging unit that is supported at one end by the base frame and urges the support member at the other end in a direction including a component in the upstream direction of the medium conveyance direction;
The second urging unit urges a part of the side surface on the upstream side of the support member to be pressed against a part of the base frame with respect to the conveyance direction of the medium.
A recording apparatus. The recording apparatus according to claim 1, wherein the support member includes a recess, and the shaft body is supported by two surfaces constituting the inner surface of the recess.
A recording apparatus. The recording apparatus according to claim 2, wherein the concave portion has a substantially V shape when viewed from the axial direction of the shaft body.
A recording apparatus. 4. The recording apparatus according to claim 1, wherein each of the first urging unit and the second urging unit includes a single spring. 5.
A recording apparatus.   The recording apparatus according to claim 1, wherein the shaft body is a hollow shaft. The recording apparatus according to any one of claims 1 to 5, wherein a plurality of the support members are provided at appropriate intervals along an axial direction of the shaft body.
A recording apparatus.

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