JP5772056B2 - Medium transport mechanism and recording apparatus provided with the same - Google Patents

Description

  The present invention relates to a medium transport mechanism that transports a recording medium along a transport path curved in a concave shape, and a recording apparatus including the medium transport mechanism.

Conventionally, as this type of medium transport mechanism, a configuration in which a sheet is transported from a paper feed cassette to a recording unit in an image recording apparatus is known. In this image recording apparatus, a paper feed roller facing the paper feed cassette, a transport path body that forms a paper feed transport path between the paper feed roller and the recording unit, a plurality of rotating rollers provided on the transport path body, It has.
The conveyance path body includes a curved plate portion provided along a U-turn-shaped sheet feeding conveyance path (U-turn path), and a plurality of rotating rollers facing the sheet feeding conveyance path through openings formed in the plate portion, The plurality of rotating rollers are arranged in the conveying direction with a space in a state where they are slightly protruded inside the plate portion. As a result, the recording medium can be reliably and stably fed to the recording unit one by one.

JP 2006-8328 A

  As described above, in the conventional medium transport mechanism, since the plurality of rotating rollers protrude greatly to the outside of the plate portion, a sufficient space is required along the paper feed transport path, and the apparatus is increased in size as a whole, and the number of parts is reduced. There was a problem that the cost was increased. In addition, since the paper is conveyed while being transferred between a plurality of rotating rollers, the feeding load becomes unstable and the conveying posture of the paper becomes unstable (skew etc.) if the mounting accuracy of each rotating roller is low. However, there is a problem that a power source with a large output is required and print quality is deteriorated.

  The present invention provides a medium transport mechanism capable of reliably and stably transporting a recording medium with minimum power and capable of being configured with a simple structure and space efficiency, and a recording apparatus including the medium transport mechanism. Is an issue.

The medium transport mechanism of the present invention includes a medium transport unit that transports a recording medium along a concavely curved transport path, and a transport guide that is disposed along the transport path and guides the transport of the recording medium by the medium transport unit. The conveyance guide includes a plurality of partial guide members having different friction coefficients with respect to the recording medium in the conveyance direction so that the feeding load from the conveyance start to the conveyance end of the recording medium acting on the medium conveyance unit is uniform. Each partial guide member is formed by two or more hook-shaped protrusions extending in the conveying direction in a parallel state, and the plurality of partial guide members are partial guides having different friction coefficients. The members are arranged so as to mesh with each other .
Another medium transport mechanism of the present invention includes a medium transport unit that transports a recording medium along a concavely curved transport path, and a transport that is disposed along the transport path and guides the transport of the recording medium by the medium transport unit. And a conveyance guide that conveys a plurality of partial guide members having different friction coefficients with respect to the recording medium so that the feeding load from the start of conveyance of the recording medium acting on the medium conveyance means to the end of conveyance is uniform. Each partial guide member is configured by a plate-like member extending in the transport direction and the width direction, and the plurality of partial guide members are partial guide members having different friction coefficients. The continuous portions are formed in a comb shape so as to mesh with each other.

By the way, if the conveyance path curved in a concave shape is configured by a single conveyance guide and is arranged in a limited space in a compact space, there are places where the sliding resistance of the recording medium being conveyed is large and small.
According to this configuration, the conveyance guide has a simple structure by connecting the portions having different friction coefficients with respect to the recording medium so that the feeding load is uniform (that is, the variation in the feeding load is suppressed). Thus, the feeding load of the medium conveying means can be made uniform. As a result, the medium conveying means can be configured with a minimum power, and the recording medium can be conveyed reliably and stably. In addition, since a plurality of rotating rollers as in the prior art is not required, it is possible to stabilize the conveyance posture of the recording medium and simplify the structure, and to save space. Thereby, a device can be comprised compactly at low cost.
Further, when the recording medium is transported, the portion where the sliding resistance of the transport guide is large and the portion where the slide resistance is small can be easily adjusted to be uniform. Thereby, the feeding load of the recording medium can be easily made uniform.
Furthermore, it is possible to sufficiently suppress the amount of change in sliding resistance at the continuous portion of the plurality of partial guide members.

  In these cases, it is preferable that the tip portions of the meshing portions are inclined so as to be out of the conveyance path.

  On the other hand, it is preferable that the plurality of partial guide members are integrally molded by multicolor molding.

  According to this configuration, it is possible to easily and inexpensively manufacture a conveyance guide with a uniform recording medium feeding load.

Another medium transport mechanism of the present invention includes a medium transport unit that transports a recording medium along a concavely curved transport path, and a transport that is disposed along the transport path and guides the transport of the recording medium by the medium transport unit. And a conveyance guide having a guide base disposed along the conveyance path and a guide sheet adhered to a surface of the guide base, the guide sheet acting as a medium conveyance unit. so from the transport starting the uniform feed load to the carry completion, a plurality of different partial sheet of friction coefficient with respect to the recording medium, is constructed by continuously to the conveying direction, a plurality of partial sheet is continuously provided friction The continuous portions of the partial sheets having different coefficients are formed in a comb shape so as to mesh with each other.

According to this configuration, the conveyance guide has a simple structure by connecting the portions having different friction coefficients with respect to the recording medium so that the feeding load is uniform (that is, the variation in the feeding load is suppressed). Thus, the feeding load of the medium conveying means can be made uniform. As a result, the medium conveying means can be configured with a minimum power, and the recording medium can be conveyed reliably and stably. In addition, since a plurality of rotating rollers as in the prior art is not required, it is possible to stabilize the conveyance posture of the recording medium and simplify the structure, and to save space. Thereby, a device can be comprised compactly at low cost.
Further, when the recording medium is transported, the portion where the sliding resistance of the transport guide is large and the portion where the slide resistance is small can be easily adjusted so as to be uniform, and the feeding load can be made uniform.
Furthermore, it is possible to sufficiently suppress the amount of change in the sliding resistance in the continuous portion of the plurality of partial sheets.

  On the other hand, it is preferable that the guide base and the plurality of partial sheets are integrally molded by multicolor molding.

  According to this configuration, it is possible to easily and inexpensively manufacture a conveyance guide with a uniform recording medium feeding load.

  On the other hand, it is preferable that the medium transport unit includes a transport roller that is in rolling contact with one surface of the recording medium, and a pressing mechanism that presses the recording medium against the transport roller.

  According to this configuration, the recording medium can be appropriately conveyed without causing a slip or the like, and the whole can be configured compactly. In addition, the conveyance posture of the recording medium can be stabilized.

  The recording apparatus of the present invention includes a recording unit that performs recording on a recording medium, a paper feeding unit that feeds the recording medium to the recording unit, and the above-described medium conveyance mechanism that conveys the recording medium from the paper feeding unit to the recording unit. , Provided.

  According to this configuration, since the recording medium can be reliably and stably conveyed, the recording quality by the recording unit can be maintained well. Further, downsizing and energy saving of the apparatus can be achieved at low cost.

1 is an external perspective view showing a recording apparatus according to an embodiment. FIG. 3 is a side sectional view showing the internal structure of the recording apparatus. It is a back perspective view showing a paper cassette. It is the back surface perspective view which showed the conveyance part periphery. It is the principal part perspective view which showed the feeding roller and the conveyance guide periphery. It is principal part sectional drawing which showed the surroundings of a feeding roller and a conveyance guide. (A) is the figure which showed the profile data of the feed load. (B) is a diagram showing the leading edge position of the paper P at each characteristic point of the profile data. (C) is sectional drawing which showed the front-end | tip position of each point, and the arrangement | positioning position of a partial guide member. It is the schematic diagram which looked at the conveyance guide of the 1st modification from the counter surface. (A) is principal part sectional drawing which showed the conveyance guide 45 of the 2nd modification. (B) is principal part sectional drawing which showed the conveyance guide 45 of the 3rd modification.

  Hereinafter, a recording apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. This recording apparatus performs desired recording while conveying a sheet (recording medium) held in an upright posture, and stacks and stacks the ejected printed sheets in an upright state. In addition, as shown in each drawing, the X axis (left and right) direction, the Y axis (front and rear) direction, and the Z axis (up and down) direction are defined and described below. In addition, the recording apparatus 1 is configured to be vertically and horizontally laid out, but in the following description, a case where the laid vertically is arranged will be described.

  FIG. 1 is an external perspective view showing the recording apparatus 1. As shown in FIG. 1, the external appearance of the recording apparatus 1 is constituted by a casing 2 that is a thin box-like body that is formed with dimensions in the Z-axis direction larger than those in the X-axis and Y-axis directions. An operation panel 21 on which operation buttons and the like are arranged, a cable terminal 22 to which a cable for connecting to a PC and the like, and a plurality of ink cartridges (not shown) are detachably mounted on the upper surface of the housing 2. And a cartridge cover 23 for opening and closing a cartridge mounting portion (not shown). A paper discharge port cover 25 that opens and closes a paper discharge port 24 (see FIG. 2) for discharging the recorded paper P is provided on the upper surface of the housing 2. The paper discharge port cover 25 is opened and closed by the user. However, even when recording is executed in a closed state, the sheet discharge port cover 25 is automatically opened by an opening / closing mechanism (not shown). Further, a cassette mounting portion 26 for detachably mounting a paper cassette 5 described later is widely provided on the front surface of the housing 2.

  Here, the internal structure of the recording apparatus 1 will be described in detail with reference to FIG. FIG. 2 is a side sectional view showing the internal structure of the recording apparatus 1. As shown in FIG. 2, the recording apparatus 1 is detachably mounted on the cassette mounting portion 26, and the sheet cassette 5 that stores the sheet P in an upright state, and the sheet P in the lower part of the recording apparatus 1. Is disposed at a vertical intermediate position facing the feed path R and along the feed path R that feeds the received paper P along the feed path R. In addition, a printing unit (recording unit) 3 that performs printing on the paper P by an inkjet method, and a device frame (not shown) that supports the transport unit 4 and the printing unit 3 are provided.

  The printing unit 3 is supported by the apparatus frame, and is supported by the carriage guide shaft 34 and the carriage guide plate 36 that extend to the full width in the X-axis direction, and reciprocally supported by the carriage guide shaft 34 and the carriage guide plate 36. The carriage unit 30 and a carriage moving mechanism (not shown) for reciprocating the carriage unit 30 along the carriage guide shaft 34 and the carriage guide plate 36 are provided. The carriage guide shaft 34 supports the lower end of the carriage unit 30, and the carriage guide plate 36 supports the upper end of the carriage unit 30 against a force to rotate about the carriage guide shaft 34. That is, the carriage unit 30 is held in an inclined posture by the carriage guide shaft 34 and the carriage guide plate 36.

  The carriage unit 30 is connected from above to the box-shaped carriage 31 supported reciprocally on the carriage guide shaft 34 and the carriage guide plate 36, the inkjet head 32 mounted on the carriage 31, and the inkjet head 32. And a connection adapter (not shown) connected to the ink cartridge via an ink tube (not shown). The inkjet head 32 has a plurality of nozzle rows (not shown) that eject ink droplets of a plurality of colors, and faces the paper P via a predetermined gap.

  The present embodiment is a so-called off-carriage type in which the ink cartridge is provided independently of the carriage 31, but may be a so-called on-carriage type in which the ink cartridge is mounted on the carriage 31. In this embodiment, the carriage 31 is a so-called serial printer that performs recording while moving in the X-axis direction. However, a fixed inkjet head 32 that covers the width of the paper P may be used. Furthermore, the recording method is not limited to the ink jet method, and other recording methods may be used.

  FIG. 3 is a rear perspective view showing the paper cassette 5. As shown in FIGS. 2 and 3, the paper cassette 5 accommodates unprinted (unrecorded) paper P in an upright position and feeds the paper P, and a cassette main body 51. And a paper discharge holding section 52 that stocks printed (recorded) paper P in an upright position and on the stock surface 61. That is, the unprinted paper P is supplied from the cassette body 51 and the printed paper P is discharged to the paper discharge holding unit 52. Then, by removing the paper cassette 5 from the apparatus main body, the stock printed paper P can be taken out together with the cassette main body 51. Further, by removing the paper cassette 5, the inside of the recording apparatus 1 can be exposed, and problems such as the paper P being jammed in the feed path R can be easily solved. Although not shown, the paper cassette 5 is configured to be slidable in the Z-axis direction with respect to the housing 2, and the attachment / detachment operation is performed by sliding the paper cassette 5.

  The cassette main body 51 is flush with the front surface of the housing 2 when mounted (see FIG. 1), and the cassette housing portion 53 forming the appearance of the recording apparatus 1 and the cassette housing portion 53 side as a receiving surface, The main body tray 54 formed in a tray shape, the upper cover 55 that faces the upper portion of the main body tray 54 and opens and closes the paper storage space for storing the paper P, and the lower portion of the main body tray 54 are accommodated in the paper storage space. And a movable tray 59 that swings the leading end of the sheet P.

  Further, the outer surface of the upper cover 55, that is, the surface facing the inside of the apparatus when mounted on the housing 2, functions as a stock surface 61 for stocking (accumulating) printed paper P (details are given here). (It will be described later.)

  The movable tray 59 is provided below the main body tray 54 on the downstream side in the sheet feeding direction when the sheet cassette 5 is mounted, and functions as a so-called hopper. The movable tray 59 is rotatable about a pair of left and right swinging fulcrums 59a provided at a substantially central portion in the vertical direction of the main body tray 54, and is swung by a driving mechanism (not shown). . As a result, the leading end of the stored paper P can be brought into a state of being pressed against (pressed against) a later-described feeding roller 41 (see FIG. 2) and a state of being separated (not shown). The pressing mechanism referred to in the claims is composed of the movable tray 59 and the driving mechanism.

  The paper discharge holding unit 52 is provided on the stock surface 61 formed by the outer surface (the inside of the apparatus) of the upper cover 55, the receiving unit 62 that receives the lower end of the discharged paper P, and the stock surface 61. And a holder 63 that holds P in an upright position.

  FIG. 4 is a rear perspective view showing the periphery of the transport unit 4. As shown in FIGS. 2 and 4, the transport unit 4 faces the leading end of the movable tray 59, rolls and contacts the stored paper P, pulls out the paper P one by one, and feeds the paper P upward by curving and reversing the paper P. A large feeding roller (conveying roller) 41, a conveyance guide 45 that faces the feeding roller 41 and guides conveyance by the feeding roller 41, and paper that feeds the paper P from the feeding roller 41 to the printing unit 3 A feed roller 42, a guide member 33 that faces the printing unit 3, a spur-shaped guide roller 43 that is disposed on the downstream side of the guide member 33 and corrects the upward warping of the paper P, and on the downstream side of the guide roller 43 And a paper discharge roller 44 for discharging the paper P to the paper discharge holding unit 52. Note that the medium transporting means described in the claims includes the pressing mechanism (the movable tray 59 and its driving mechanism), the feeding roller 41, and a feeding motor (not shown) for driving the feeding roller 41. ing.

  The paper feed roller 42 is composed of a nip roller having a front side paper feed drive roller 42a and a rear side paper feed driven roller 42b, and functions as a main roller for controlling the feed (sub-scan) of the paper P. . The paper discharge roller 44 includes a nip roller having a front paper discharge driving roller 44a and a rear paper discharge driven roller 44b, and applies tension to the paper P positioned above the guide member 33. Functions as a tension roller to be applied. The paper discharge roller 44 is disposed in the vicinity of the lower portion of the paper discharge holding unit 52 and feeds the paper P from below so as to follow the stock surface 61 of the paper discharge holding unit 52. The paper feed roller 42, the guide roller 43, and the paper discharge roller 44 are each composed of a plurality of divided rollers arranged at appropriate intervals in the width direction (X-axis direction) of the paper P.

  The guide member 33 constitutes a part of the feed path R and defines a gap (work gap) between the recording surface of the paper P and the inkjet head 32 (functions as a so-called platen). In addition, the guide member 33 is formed with a recess for receiving ink to be ejected in a region off the edge of the paper P during borderless printing at a position facing the ink jet head 32. In this recess, an ink absorbing material (not shown) for absorbing ink is provided. Further, a waste liquid tank (not shown) for storing the discarded ink is disposed below the guide member 33.

  The paper P drawn downward by the feed roller 41 is inverted upward by the feed roller 41 and the transport guide 45 and is sent to the paper feed roller 42. Further, the paper P is nipped and conveyed between the paper feed rollers 42 and sent to the printing unit 3. The paper P recorded by the printing unit 3 is discharged to the paper discharge holding unit 52 of the paper cassette 5 through the guide roller 43 and the paper discharge roller 44.

  In the printing process, the paper P is intermittently fed (sub-scanned) in the substantially Z-axis direction by the transport unit 4 and the carriage unit 30 is reciprocated in the X-axis direction by the carriage moving mechanism while driving the inkjet head 32 ( Image data is printed on the paper P.

  Here, with reference to FIG. 5 thru | or FIG. 7, the feed roller 41 and the conveyance guide 45 are demonstrated in detail. FIG. 5 is a perspective view of a main part showing the feed roller 41 and the conveyance guide 45. FIG. 6 is a cross-sectional view of a main part showing the feed roller 41 and the conveyance guide 45. The feeding roller 41 and the conveyance guide 45 are configured to invert and convey the paper P. Hereinafter, the concavely curved path is referred to as a reverse conveyance path (conveyance path) R1 (one-dot chain line in FIG. 6). ). As shown in FIG. 5 and FIG. 6, the feeding roller 41 is a driving roller and includes a plurality of divided rollers arranged at appropriate intervals in the width direction (X-axis direction) of the paper P. Yes. The feed roller 41 rolls in contact with the paper P accommodated in the paper cassette 5, pulls out the paper P downward, and transports the paper P along the reverse transport path R1 so as to follow the outer peripheral surface thereof. To do. A feeding motor is connected to the feeding roller 41, and the feeding motor is a driving source of the feeding roller 41.

  The conveyance guide 45 includes a curved plate-shaped guide base 71 disposed along the reversal conveyance path R <b> 1, and a plurality of partial guide members 72 provided continuously (for example, fitted) on the guide base 71. Yes. The plurality of partial guide members 72 face the reverse conveyance path R <b> 1 from the outside, that is, are formed so as to face the outer peripheral surface of the feeding roller 41. The feed roller 41 is in rolling contact with the inner surface (non-recording surface) of the paper P, while the plurality of partial guide members 72 are in contact with the outer surface (recording surface) to guide the paper P. .

  The plurality of partial guide members 72 are configured by two types of partial guide members 72 having different friction coefficients. Specifically, a first partial guide member 72a formed of a general material (for example, ABS: acrylonitrile butadiene styrene), and a material (low friction material) having a lower coefficient of friction than the first partial guide member 72a (for example, And a second partial guide member 72b formed of POM (Polyacetal) or PBT (Polybutylene terephthalate), and these are alternately arranged along the reverse conveyance path R1. Each partial guide member 72 is composed of two or more hook-shaped projections (ribs) extending in the conveying direction in a parallel state, and the partial guide members 72 arranged in series are arranged to mesh with each other. Yes. Furthermore, the tip portions of the portions that mesh with each other are inclined so as to be disengaged from the reverse conveyance path R1 (see FIG. 6).

  Next, the arrangement positions of the first partial guide member 72a and the second partial guide member 72b will be described. FIG. 7A is a diagram showing profile (analysis) data of the transport force (feed load of the paper P acting on the feed roller 41) at the feed motor during transport in the reverse transport path R1. FIG. 7B shows the position of the leading edge of the conveyed paper P at each characteristic point (point A, point B, point C, point D) of the profile data. FIG. 7A shows the feeding load acting on the feeding roller 41 on the vertical axis and the leading end position of the paper P on the horizontal axis. Further, the profile data (shown by the solid line in FIG. 7A) is data obtained using the transport guide 45 having the same friction coefficient on the reverse transport path R1. As shown in FIGS. 7A and 7B, on the reverse conveyance path R1, there are a portion where the feeding load of the paper P is large and a portion where the feeding load is small. This is determined by the balance between the curvature of feeding the paper P and the position where the paper P is pinched (the position where the pressure mechanism is pressed against the feeding roller 41 or the pressure of the paper feeding roller 42). The sliding resistance of the tip based on the rigidity of the roller is the main factor of the feed load. On the other hand, the arrangement positions of the first partial guide member 72a and the second partial guide member 72b are set based on the profile data so that the feed load is uniform on the reverse conveyance path R1.

  Specifically, as shown in FIG. 7C, the second partial guide having a low friction coefficient around the position (point A and point C) where the feed load in the reverse conveyance path R1 is large on the basis of the tip position. A member 72b is provided. In the present embodiment, specifically, the feeding load is at a position immediately after the paper P is started to be fed by the feeding roller 41, or at a point A or C around the position immediately before starting to be separated from the feeding roller 41. It is getting bigger. In addition, the first partial guide member 72a is disposed around a position (point B and point D) where the feed load in the reverse conveyance path R1 is small. That is, the conveyance guide 45 is configured by connecting portions having different friction coefficients with respect to the paper P so that the feeding load from the conveyance start to the conveyance end of the paper P in the reverse conveyance path R1 is uniform. Thus, by adjusting the frictional resistance of the conveyance guide 45, the feeding load of the paper P in the reverse conveyance path R1 is corrected and made uniform. Note that “uniformization” described here is not a uniformization in a strict sense such that the feeding load of the paper P in the reverse conveyance path R1 is completely uniform, but is indicated by a dotted line in FIG. Thus, it is natural to include a feed load having a certain width (equalized to a load range having a width). In other words, when the conventional conveyance guide 45 having the same friction coefficient on the reverse conveyance path R1 is used, a large variation occurs in the feed load, but the friction resistance of the conveyance guide 45 is adjusted to suppress the variation in the feed load. If it is intended, it is included in the “uniformization”.

  Next, a modified example of the transport guide 45 will be described with reference to FIGS. FIG. 8 is a schematic view of the conveyance guide 45 according to the first modification viewed from the facing surface. As shown in FIG. 8, in the conveyance guide 45 of this modification, each partial guide member 72 (first partial guide member 72a and second partial guide member 72b) has a conveyance direction and a width direction (perpendicular to the conveyance direction). It is comprised with the plate-shaped member extended in a direction. In such a case, the continuous portions of the plurality of partial guide members 72 are formed in a comb-tooth shape so as to mesh with each other, and the front end portions of the meshing portions are inclined so as to be disengaged from the reverse conveyance path R1. ing.

  FIG. 9A is a cross-sectional view of a main part showing a conveyance guide 45 of a second modified example. As shown in FIG. 9A, the conveyance guide 45 of the second modified example has a guide base 71 and a guide sheet 81 adhered to the surface of the guide base 71 (the surface on the paper P side). The guide sheet 81 is configured by connecting a plurality of partial sheets 82 having different friction coefficients in the conveying direction. Specifically, it has a first partial sheet 82a formed of a general material and a second partial sheet 82b formed of a material having a coefficient of friction larger than that of the first partial sheet 82a. They are arranged alternately along R1. Each partial sheet 82 is composed of a sheet-like member extending in the transport direction and the width direction (a direction orthogonal to the transport direction). Also in this case, the continuous portions of the plurality of partial sheets 82 are formed in a comb shape so as to mesh with each other. Further, similarly to the above-described embodiment, the first partial sheet 82a and the second partial sheet 82b are arranged based on the arrangement position shown in FIG.

  FIG. 9B is a cross-sectional view of a main part showing a conveyance guide 45 of a third modification. As shown in FIG. 9B, the conveyance guide 45 of the third modification has a guide base 71 and a coat layer 86 formed on the surface of the guide base 71 (surface on the paper P side). The coat layer 86 is configured by connecting a plurality of partial coat layers 87 having different friction coefficients in the transport direction. Specifically, it has a first partial coat layer 87a on which a general material is formed and a second partial coat layer 87b on which a material having a friction coefficient larger than that of the first partial coat layer 87a is formed. They are alternately arranged along the reverse conveyance path R1. Similarly to the above embodiment, the first partial coat layer 87a and the second partial coat layer 87b are arranged based on the arrangement position shown in FIG.

  According to the above-described embodiment and each modification, the conveyance guide 45 is configured by connecting portions having different friction coefficients with respect to the paper P, whereby the feeding load of the paper P can be made uniform with a simple structure. Thus, the feeding motor can be configured with a minimum power, and the paper P can be transported reliably and stably. In addition, since a plurality of rotating rollers as in the prior art is not required, it is possible to stabilize the conveyance posture of the paper P and simplify the structure, and to save space. Thereby, a device can be comprised compactly at low cost.

  Further, in the above embodiment and the first modification, the conveyance guide 45 is configured by connecting a plurality of partial guide members 72 having different friction coefficients, so that when the sheet P is conveyed, the sliding resistance of the conveyance guide 45 is increased. The large and small areas can be easily adjusted to be uniform. Thereby, the feeding load of the paper P can be easily made uniform.

  Furthermore, in the above-described embodiment and the first modification, by arranging or forming the plurality of partial guide members 72 so as to mesh with each other, the amount of change in the sliding resistance at the continuous portion of the plurality of partial guide members 72 can be reduced. It can be sufficiently suppressed. Further, by tilting the leading end portions of the meshing portions outward, the paper P is prevented from being caught on the leading end portion.

  Furthermore, in the second modification, the conveyance guide 45 includes the guide base 71 and the guide sheet 81 (a plurality of partial sheets 82), so that the conveyance resistance of the conveyance guide 45 is large when the paper P is conveyed. However, the small portions can be easily adjusted so as to be uniform, and the feed load can be made uniform.

  Furthermore, in the third modification, the conveyance guide 45 is constituted by the guide base 71 and the coat layer 86 (a plurality of partial coat layers 87), so that the conveyance resistance of the conveyance guide 45 is large when the sheet P is conveyed. However, the small portions can be easily adjusted so as to be uniform, and the feed load can be made uniform. In addition, the conveyance guide 45 in which the paper P feeding load is uniform can be manufactured easily and inexpensively.

  In the above embodiment, a plurality of separate partial guide members 72 are connected to the guide base 71, but the multiple partial guide members 72 are integrated by multicolor molding (two-color molding). The structure which shape | molds to may be sufficient. Further, in the second modified example, the guide base 71 and the plurality of partial sheets 82 are formed as separate bodies, and the plurality of partial sheets 82 are adhered to the guide base 71. The partial sheet 82 may be integrally molded by multicolor molding. In these cases, the conveyance guide 45 in which the feeding load of the paper P is uniform can be manufactured easily and inexpensively.

  In the above embodiment and the first modification, the feed load in the reverse conveyance path R1 is adjusted according to the arrangement positions of the two types of partial guide members 72a and 72b having different friction coefficients. The feed load may be adjusted more finely by using more types of partial guide members 72 having different coefficients. Eventually, the frictional resistance may be increased or decreased by surface processing on the partial guide member 72 to adjust the feed load. The same applies to the partial sheet 82 of the second modified example and the partial coat layer 87 of the third modified example.

  In the above embodiment and each modification, a plurality of members (partial guide member 72, partial sheet 82, or partial coat layer 87) having different friction coefficients are obtained based on profile data (simulation data) obtained through experiments. Although the configuration is a continuous configuration, a configuration using an estimated value as profile data may be used. For example, as described above, the profile data is estimated from these pieces of information in order to determine the balance with the curvature of feeding the paper P and the position where the paper P is pinched. That is, based on the estimated value, a plurality of members having different friction coefficients are arranged in series so that the feed load is uniform.

  DESCRIPTION OF SYMBOLS 1: Recording apparatus 3: Printing part 4: Transport part 41: Feeding roller 45: Transport guide 51: Cassette main body 59: Movable tray 71: Guide base 72: Partial guide member 81: Guide Sheet, 82: partial sheet, 86: coat layer, 87: partial coat layer, P: paper, R1: reverse conveyance path

Claims (8)

Medium transport means for transporting the recording medium along a transport path curved in a concave shape;
A conveyance guide disposed along the conveyance path and guiding conveyance of the recording medium by the medium conveyance unit;
The conveyance guide has a plurality of partial guide members having different friction coefficients with respect to the recording medium in the conveyance direction so that a feeding load from the conveyance start to the conveyance end of the recording medium acting on the medium conveyance unit is uniform. Have in a row,
Each of the partial guide members is composed of two or more hook-shaped protrusions extending in the transport direction in a parallel state,
The medium conveying mechanism, wherein the plurality of partial guide members are arranged so that the partial guide members having different friction coefficients are meshed with each other . Medium transport means for transporting the recording medium along a transport path curved in a concave shape;
A conveyance guide disposed along the conveyance path and guiding conveyance of the recording medium by the medium conveyance unit;
The conveyance guide has a plurality of partial guide members having different friction coefficients with respect to the recording medium in the conveyance direction so that a feeding load from the conveyance start to the conveyance end of the recording medium acting on the medium conveyance unit is uniform. Have in a row,
Each partial guide member is composed of a plate-like member extending in the transport direction and the width direction,
The medium conveying mechanism, wherein the plurality of partial guide members are formed in a comb-like shape so that the continuous portions of the partial guide members having different friction coefficients that are provided continuously mesh with each other. 3. The medium transport mechanism according to claim 1 , wherein tip portions of the meshing portions are inclined so as to be out of the transport path. 4. The medium conveying mechanism according to claim 1, wherein the plurality of partial guide members are integrally molded by multicolor molding. Medium transport means for transporting the recording medium along a transport path curved in a concave shape;
A conveyance guide disposed along the conveyance path and guiding conveyance of the recording medium by the medium conveyance unit;
The transport guide has a guide base disposed along the transport path, and a guide sheet adhered to the surface of the guide base,
The guide sheet connects a plurality of partial sheets having different friction coefficients with respect to the recording medium in the conveyance direction so that a feeding load from the start to the end of conveyance of the recording medium acting on the medium conveyance unit is uniform. Configured,
The medium conveying mechanism, wherein the plurality of partial sheets are formed in a comb-like shape so that the continuous portions of the partial sheets having different friction coefficients are meshed with each other. The medium conveying mechanism according to claim 5, wherein the guide base and the plurality of partial sheets are integrally formed by multicolor molding. Said medium transport means, said a rolling contact conveyance rollers on one side of the recording medium, any of claims 1 to 6, characterized in that a, a pressing mechanism for pressing the recording medium to the conveying roller medium conveying mechanism crab according. A recording unit for recording on the recording medium;
A paper feeding unit for feeding the recording medium to the recording unit;
A recording apparatus comprising: the medium conveying mechanism according to claim 1 , wherein the recording medium is conveyed from the paper feeding unit to the recording unit.

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