Printing device

Abstract

To reduce the possibility of occurrence of conveyance failure even when conveying and printing a medium to be printed having a wide width.SOLUTION: A first roller mechanism 19 includes: a first shaft part 28 having a rotatably supported first gear 27; and a platen roller 18 into which the first shaft part 28 is inserted, and which is moved by a displacement mechanism to come into contact with and separate from a printing head part 13. A second roller mechanism 21 includes: a roller holder 22 which is moved by the displacement mechanism to come into contact with and separate from a medium to be printed; a second shaft part 30 rotatably supported by the roller holder 22, and having a second gear 31 at a portion on a first side along an axial direction; a hollow cylindrical sub roller 20 into which the second shaft part 30 is inserted, and which can be tilted with respect to the shaft center of the second shaft part 30; an engagement groove 20c recessed in an inner peripheral surface of an intermediate part in an axial direction in the sub roller 20; and a projection 34 disposed projecting from an outer peripheral surface of the second shaft part 30, and engaged with the engagement groove 20c of the sub roller 20.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to a printing device, and more particularly to a printing device equipped with a transport unit that transports a print medium. [Background technology]

[0002] 2. Description of the Related Art Printing devices that create tape-shaped labels suitable for applications such as attaching them to the spine of a file are known.

[0003] A well-known example of such a printing device is a label producing device that prints characters, designs, and the like inputted using an input means such as a keyboard onto a tape-like print medium using a print head and an ink ribbon.

[0004] Furthermore, in such label production devices, a transport mechanism that transports the print medium toward the print head is known that includes a first roller mechanism having a platen roller, a second roller mechanism having a sub-roller arranged downstream of the first roller mechanism in the transport direction, and a displacement mechanism that displaces the first roller mechanism and the second roller mechanism so as to move closer to or away from the print head (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4075888 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the above-mentioned sub-roller needs to be equipped with a centering mechanism to accommodate changes in load when it is brought close to the print medium. Also, to accommodate a wide print medium, the axial lengths of the platen roller and the sub-roller need to be increased. In this case, if the strength of the centering mechanism is insufficient, the roller shaft that rotatably supports the sub-roller will bend, causing a problem of poor transport.

[0007] An object of the present invention is to provide a printing device that can reduce the risk of transport failure even when transporting and printing on a wide print medium. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a printing device including a transport means for transporting a print medium, the transport means including a first roller mechanism having a first roller and a second roller mechanism having a second roller, the second roller mechanism being disposed downstream in a transport direction from the first roller mechanism, a print head for printing on the print medium transported by the transport means, and a displacement mechanism for displacing the print head between a close position where the first roller mechanism and the second roller mechanism are close to each other and a separated position farther away than the close position, the first roller mechanism being rotatably supported by a first shaft portion having a first gear at a portion on a first side along an axial direction of the first roller mechanism, The second roller mechanism has a first roller through which an axle portion is inserted and rotatably supported, and which moves in a direction toward and away from the print head by the displacement mechanism, and the second roller mechanism has a movable holder which moves in a direction toward and away from the print medium by the displacement mechanism, a second axle portion which is rotatably supported by the movable holder and has a second gear at a first side portion along the axial direction, a hollow cylindrical second roller through which the second axle portion is inserted and which can be tilted relative to the axial center of the second axle portion, an engagement groove recessed into the inner surface of the middle portion of the second roller in the axial direction, and a protrusion which protrudes from the outer surface of the second axle portion and engages with the engagement groove of the second roller.

[0009] In the present invention, a first roller mechanism and a second roller mechanism are provided along the transport path of the transport means. The first roller mechanism is provided with a first roller through which the first shaft portion is inserted, and the second roller mechanism located downstream in the transport direction of the first roller mechanism is provided with a second roller through which the second shaft portion is inserted. In this case, the second roller mechanism is also provided with a movable holder that is moved in a direction toward and away from the print medium by a displacement mechanism, and the second shaft portion is provided on the movable holder. As a result, the second shaft portion of the second roller is configured to move in a direction toward and away from the print medium as appropriate in response to, for example, the tension or transport behavior of the print medium, thereby realizing a so-called centering function.

[0010] In the present invention, the second roller is configured as a hollow cylinder, and an engagement groove is recessed into the inner peripheral surface of the hollow cylinder. Meanwhile, a protrusion is provided on the second shaft portion inserted into the hollow cylinder of the second roller, and the protrusion engages with the engagement groove. As a result, a driving force is transmitted from a second gear located at a portion on the first side of the second shaft portion to the second shaft portion, and the driving force is transmitted to the second roller via the protrusion and the engagement groove.

[0011] In this manner, according to the present invention, the driving force is transmitted from the round bar-shaped second shaft portion inside the cylindrical shape to the cylindrical second roller located on the outer circumferential side thereof.

[0012] This improves the overall rigidity compared to a conventional structure in which a hollow cylindrical drive shaft is rotated on the outer periphery of an axis provided in a movable case, a hollow cylindrical roller is disposed on the outer periphery of the hollow cylindrical drive shaft, and the protrusions on the inner periphery of the roller are engaged with the engagement groove of the drive shaft. In other words, according to the present invention, unlike the conventional structure in which the driving force is transmitted via the cylindrical drive shaft → engagement groove → protrusion → cylindrical roller, the driving force is transmitted via the round bar-shaped second shaft portion → protrusion → engagement groove → cylindrical second roller, so bending is less likely to occur.

[0013] This makes it possible to reduce the risk of transport failure occurring even when transporting and printing on a wide print medium. Effect of the Invention

[0014] According to the present invention, even when a wide print medium is transported and printed on, the risk of transport failure occurring can be reduced. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a front view of the printing device with the cover removed. [Diagram 2] FIG. 2 is a perspective view of a tape cassette and its surrounding structure. [Diagram 3] FIG. [Figure 4] 13A and 13B show the operation of a second roller mechanism that operates in conjunction with the lever, in which FIG. 13A is a front view of the main parts when the lever is in a laid-down state, and FIG. [Diagram 5] 13A and 13B show the operation of a second roller mechanism that operates in conjunction with the lever, in which FIG. 13A is a side view of the main parts when the lever is in a laid-down state, and FIG. [Figure 6] FIG. 4 is a partially cutaway front view of the second roller mechanism. [Figure 7] FIG. 4 is a side view of the second roller mechanism. [Figure 8] 4A and 4B show a main portion of a second roller mechanism, in which FIG. 4A is a front view of the second roller mechanism and FIG. 4B is a side view of the second roller mechanism with a portion cut away. [Figure 9] FIG. 4 is a partially cutaway front view of the second roller mechanism. [Figure 10] FIG. 4 is a cross-sectional view of a main part of a second roller mechanism. [Figure 11] FIG. 13 is a partially cutaway front view of another second roller mechanism. [Figure 12] FIG. 11 is a cross-sectional view of a main part of another second roller mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Next, a printing device according to an embodiment of the present invention will be described with reference to the drawings. The scale of the components of the embodiment shown in each drawing has been appropriately changed to facilitate understanding of the present invention. In addition, in the following description, the printing device is used in a case where characters or the like are input and printing is performed, for example, when the printing device is placed on a table or the like and the directions are described as up, down, left, and right as seen from the user's side.

[0017] In this embodiment, a printing device that prints on a print medium by removably mounting a tape cassette that contains the print medium will be described as an example.

[0018] As shown in FIG. 1, the printing device 1 is provided with, on the top surface of a housing-shaped main body case 2, a cassette storage section 3 for mounting a tape cassette, which will be described later, and a keyboard section 4 for inputting characters and the like.

[0019] The cassette storage section 3 is covered by a cover (not shown). This cover is of an openable / closable type that rotates via a hinge mechanism relative to the main body case 2. In addition, the cover (not shown) is provided with a display section or the like for displaying characters or the like input by a user using the keyboard section 4, for example.

[0020] As shown in FIG. 2, the tape cassette 5 used in the printing device 1 can be attached to a print transport unit 6 arranged in the cassette storage section 3.

[0021] The tape cassette 5 has a first roll 5b on which a strip-shaped base tape (not shown) is wound, a second roll 5a on which a transparent cover tape (not shown) is wound, a ribbon supply side roll 5d on which an ink ribbon (not shown) is wound, a ribbon take-up roller 5c for taking up the ink ribbon after printing, and a tape feed roller 5e. The base tape is made of double-sided tape, one side of which has a release paper attached and the other side has an adhesive layer, and the desired label is created by bonding it to the printed cover tape. In the following description, the cover tape is collectively referred to as the print medium unless otherwise specified.

[0022] 3, the print transport unit 6 includes a first transport section 14 and a second transport section 16. The first transport section 14 includes a reel section 9 that rotates the ribbon take-up roller 5c and a drive roller 11 that rotates the tape feed roller 5e by driving a drive motor 15, and a print head section 13 including a print head. The second transport section 16, which will be described in detail later, includes a platen roller 18 that prints on the cover tape while transporting the ink ribbon and cover tape while pressing them together against the print head section 13, and a sub-roller 20 that transports the cover tape and base tape while sandwiching them with the tape feed roller 5e to bond them together.

[0023] The second conveying section 16 is provided with a lever 17 which is pushed by the cover and rotates to the lying side when the cassette storage section 3 is closed by the cover as shown in Figures 4(A) and 5(A), and which rotates to the standing side when the cassette storage section 3 is opened by the cover as shown in Figures 4(B) and 5(B).

[0024] The second transport section 16 constitutes a transport means for transporting the printing medium, and as shown in Figures 6 to 10, comprises a first roller mechanism 19 having a platen roller 18 as a first roller, and a second roller mechanism 21 having a sub-roller 20 as a second roller arranged downstream of the first roller mechanism 19 in the transport direction.

[0025] The second transport section 16 is equipped with a roller holder 22 that constitutes a displacement mechanism of the head movable mechanism that displaces the first roller mechanism 19 and the second roller mechanism 21 between an approach position and a separated position relative to the print head section 13 in conjunction with the rotation of the lever 17.

[0026] The drive motor 15 and the lever 17 and roller holder 22 which constitute the displacement mechanism are attached to the main case 2 via a base frame 23 and a side frame 24. The lever 17 is biased in the cover opening direction by a spring 26 which is attached to the roller holder 22 via a shaft 25.

[0027] The first roller mechanism 19 is rotatably supported by the roller holder 22 and includes a first shaft portion 28 having a first gear 27 at a portion on a first side (the lower side in this example) along the axial direction. The platen roller 18 is rotatably supported by the roller holder 22 via the first shaft portion 28. When the roller holder 22 swings in conjunction with the rotation of the lever 17, the platen roller 18 moves in a direction toward and away from the print head unit 13.

[0028] The second roller mechanism 21 comprises a movable holder 29 that moves in a direction toward and away from the printing medium by a displacement mechanism, a second shaft portion 30 held by a first receiving portion 29a on a first side of the movable holder 29 and a second receiving portion 29b on a second side (the upper side in this example) that is opposite the first side along the axial direction, and a second gear 31 that is positioned on the second side of the first receiving portion 29a of the movable holder 29 and is rotatably supported by the second shaft portion 30.

[0029] The sub-roller 20 is configured as a hollow cylinder supported between the second receiving portion 29b of the movable holder 29 and the second gear 31 so as to be rotatable with respect to the second shaft portion 30 and tiltable with respect to the axis of the second shaft portion 30. Here, the sub-roller 20 has a double structure of, for example, an outer cylinder 20a made of a soft resin or the like and an inner cylinder 20b made of a hard resin or the like, and the second shaft portion 30 is inserted into the inner cylinder 20b, and the inner peripheral surface of the middle portion in the axial direction contacts the second shaft portion 30. Note that the above-mentioned terms "soft" and "hard" do not mean the hardness as chemically classified as a resin material, but mean the hardness when comparing the outside and the inside.

[0030] Further, an engagement groove 20c is formed as a recess in the inner circumferential surface of the axially intermediate portion of the inner cylindrical body 20b. In the present embodiment, this engagement groove 20c is formed across from the first side to the intermediate portion of the inner cylindrical body 20b, and is formed as a pair so as to face each other.

[0031] On the other hand, the second shaft portion 30 is provided with an axial projection 34 extending in a direction perpendicular to the axis and projecting from the outer circumferential surface, and both ends of this projection 34 projecting from the outer circumferential surface engage with the engagement groove 20c of the sub-roller 20. Therefore, the second shaft portion 30 employs a configuration in which only this projection 34 contacts the inner cylindrical body 20b.

[0032] The roller holder 22 has long holes 22a and 22b formed therein to allow the platen roller 18 and the sub-roller 20 to be displaced in the direction in which the first shaft portion 28 and the second shaft portion 30 of the roller holder 22 are displaced.

[0033] The base frame 23 rotatably supports the gears G1 to G7, including a transmission gear G6 serving as a third gear meshing with the first gear 27 and a transmission gear G7 serving as a fourth gear meshing with the second gear 31. The base frame 23 also includes a first through hole 23A and a second through hole 23B that pass through a first side portion of the first shaft portion 28 and a first side portion of the second shaft portion 30, respectively, as shown in Fig. 4(B). The first through hole 23A and the second through hole 23B respectively pass through the first shaft portion 28 and the second shaft portion 30 so as to be movable in a direction perpendicular to the penetration direction. When the roller holder 22 is in the retracted position, the first shaft portion 28 and the second shaft portion 30 do not contact the first edge portion 23Aa of the first through hole 23A and the second edge portion 23Ba of the second through hole 23B, respectively, and when the roller holder 22 is in the printing position, the first shaft portion 28 and the second shaft portion 30 abut against the first positioning portion 23Ab provided on the first edge portion 23Aa and the second positioning portion 23Bb provided on the second edge portion 23Ba, respectively.

[0034] This allows the first shaft portion 28 and the second shaft portion 30 to be positioned at a predetermined position of the first edge portion 23Aa and the second edge portion 23Ba when the roller holder 22 is in the printing position. As a result, the distance between the meshing gears, i.e., the distance between the first gear 27 and the third gear, and the distance between the second gear 31 and the fourth gear, can be kept constant. As a result, the variation in gear backlash can be suppressed, and the conveying accuracy can be improved.

[0035] The displacement mechanism includes a roller holder 22 that swings to move the first roller mechanism 19 and the second roller mechanism 21 in a direction toward and away from the print head unit 13, the first roller mechanism 19 being provided in the roller holder 22, the platen roller 18 being rotatably supported by the roller holder 22 and moving in a direction toward and away from the print head unit 13 as the roller holder 22 swings, and the second roller mechanism 21 being positioned in a portion of the roller holder 22 downstream of the first roller mechanism 19 in the transport direction, and the roller holder 22 being supported by the roller holder 22 and moving in a direction toward and away from the print medium.

[0036] In this way, the first roller mechanism 19 and the second roller mechanism 21 are provided on the oscillating roller holder 22. As a result, by oscillating the roller holder 22, the platen roller 18 of the first roller mechanism 19 can be moved in a direction toward or away from the print head unit 13, and the roller holder 22 of the second roller mechanism 21 can be moved in a direction toward or away from the print medium.

[0037] Here, the second shaft portion 30 of the sub-roller 20 is a metal shaft portion, the protrusion 34 functions as a first pin (metal or non-metal) extending in a direction perpendicular to the axis of the second shaft portion 30, the engagement groove 20c of the sub-roller 20 engages with the protrusion 34 serving as the first pin, and the rotation of the second shaft portion 30 is transmitted to the sub-roller 20 via the mutually engaging protrusion 34 and the engagement groove 20c.

[0038] In this way, the protrusion 34 serving as a first pin provided on the metallic second shaft portion 30 engages with the engagement groove 20c of the sub-roller 20, and the rotation of the second shaft portion 30 is transmitted via the second shaft portion 30 → protrusion 34 → engagement groove 20c → sub-roller 20. In this way, the driving force is transmitted from the round bar-shaped second shaft portion 30 to the hollow cylindrical sub-roller 20 located on its outer periphery, so that the rigidity can be increased compared to the conventional structure in which the driving force is transmitted from a hollow cylindrical drive shaft to the hollow cylindrical sub-roller 20.

[0039] Here, the second roller mechanism 21 further has a second pin 35 that is provided protruding from the outer circumferential surface of the second shaft portion 30 and extends in a direction perpendicular to the axis of the second shaft portion 30, and the second gear 31 is configured to fit with the second pin 35, and the rotation of the second gear 31 is transmitted to the second shaft portion 30 via the engaging second pin 35. In this case, the extending direction of the protrusion 34 and the extending direction of the second pin 35 are the same direction.

[0040] In this manner, the second pin 35 protruding from the second shaft portion 30 is fitted into the second gear 31, and the rotation of the second gear 31 is transmitted to the second shaft portion 30 via the second pin 35. This makes it possible to transmit the rotation from the second gear 31 to the second shaft portion 30 with a highly rigid structure.

[0041] An end face of the sub-roller 20 on a first side along the axial direction and an end face of the second gear 31 on a second side opposite the first side along the axial direction are spaced apart from each other in the axial direction.

[0042] This allows the sub-roller 20 and the second gear 31 to be positioned at a distance from each other in the axial direction, realizing a structure that differs from the conventional structure in which power is transmitted from a hollow cylindrical drive shaft to a hollow cylindrical sub-roller 20.

[0043] Here, the device further includes a movable body 36 that moves between a first position and a second position to swing the roller holder 22 between the retracted position and the printing position, and this movable body 36 has a support portion 36a that contacts the surface of the roller holder 22 opposite the side where the platen roller 18 is disposed and holds the roller holder 22 so as not to tilt. The axial length of the support portion 36a (the length in the vertical direction on the paper surface in FIG. 5) is set to be greater than half the axial length of the roller holder 22.

[0044] That is, as the movable body 36 moves between the first position and the second position, the roller holder 22 swings between the retracted position and the printing position. At this time, the movable body 36 is provided with a support portion 36a whose axial length is greater than half the axial length of the roller holder 22. The support portion 36a comes into contact with the side of the roller holder 22 opposite to the platen roller 18 side, thereby holding the roller holder 22 from tilting. This makes it possible to prevent the roller holder 22 from falling or tilting due to the reaction force generated when the platen roller 18 comes into contact with the print head unit 13.

[0045] In this way, the displacement mechanism includes a roller holder 22 that swings in conjunction with the rotation of the lever to move the first roller mechanism 19 and the second roller mechanism 21 in a direction toward and away from the print head unit 13. The first roller mechanism 19 is provided in the roller holder 22. The platen roller 18 is rotatably supported by the roller holder 22, and moves in a direction toward and away from the print head unit 13 as the roller holder 22 swings. The second roller mechanism 21 is disposed in a portion of the roller holder 22 that is downstream of the first roller mechanism 19 in the transport direction. The movable holder 29 is supported by the roller holder and moves in a direction toward and away from the print medium.

[0046] That is, the first roller mechanism 19 and the second roller mechanism 21 are provided on a swingable roller holder 22. As a result, by swinging the roller holder 22, the platen roller 18 of the first roller mechanism 19 can be moved in a direction toward and away from the print head unit 13, and the movable holder 29 of the second roller mechanism 21 can be moved in a direction toward and away from the print medium.

[0047] Here, the second roller mechanism 21 is disposed between the roller holder 22 and the movable holder 29, and includes a plurality of compression springs 33 as biasing means for biasing the movable holder 29 in a direction approaching the print medium.

[0048] Therefore, the sub-roller 20 is biased in a direction that causes the movable holder 29 to approach the print medium by a compression spring 33 provided between the roller holder 22 and the movable holder 29. As a result, even if the tension or transport behavior of the print medium fluctuates, the movable holder 29 can move in the direction toward or away from the print medium while being biased toward the print medium in response, thereby achieving a smooth centering function.

[0049] Here, the biasing means can also be configured so that a first pressing force pressing the roller holder 22 on the first side is greater than a second pressing force pressing the roller holder 22 on the second side opposite to the first side.

[0050] In this case, the biasing means has a larger pressing force on the first side closer to the second gear 31 than on the second side, thereby making it possible to suppress the behavior of the second gear 31 moving away from the mating gear.

[0051] As shown in FIG. 4, a plurality of transmission gears G1 to G7 of different diameters are arranged on the base frame 23 to transmit the drive force of the drive motor 15. The reel section 9 rotates due to the rotation of the transmission gear G4, and the transmission gears G6 and G7 rotate due to the rotation of the transmission gear G5.

[0052] In the above basic configuration, when the cover is opened to store the tape cassette 5 in the cassette storage section 3 and then the cover is closed to close the cassette storage section 3, the standing lever 17 is pushed and rotated to the lying down side.

[0053] When the lever 17 rotates to the lowered side, the roller holder 22 is displaced in conjunction therewith so as to approach the print head unit 13, and the drive motor 15 is driven to rotate the transmission gears G6 and G7.

[0054] When the transmission gear G6 rotates, the platen roller 18 rotates via the meshed first gear 27. When the transmission gear G7 rotates, the drive roller 11 rotates and the sub-roller 20 rotates via the meshed second gear 31 with the transmission gear G7.

[0055] The base tape and the cover tape are sandwiched between the drive roller 11 and the sub-roller 20 in an overlapping relationship, so that as the drive roller 11 and the sub-roller 20 rotate, the base tape and the cover tape are stuck together and transported.

[0056] At this time, the sub-roller 20 can reduce the risk of transport failure due to the above-mentioned reinforcing structure, even when transporting and printing on a wide print medium.

[0057] As described above, the printing device 1 is a printing device 1 including a conveying means for conveying a print medium, the conveying means including a first roller mechanism 19 having a platen roller 18 and a second roller mechanism 21 having a sub-roller 20, the second roller mechanism 21 being disposed downstream of the first roller mechanism 19 in the conveying direction, a print head unit 13 for printing on the print medium conveyed by the conveying means, and a displacement mechanism (lever 17 and roller holder 22) for displacing the first roller mechanism 19 and the second roller mechanism 21 to a close position where the print head unit 13 is close to the first roller mechanism 19 and the second roller mechanism 21, and a separated position farther away from the close position, the first roller mechanism 19 being rotatably supported by a first shaft portion having a first gear 27 at a portion on a first side along the axial direction. 28, and a platen roller 18 through which the first shaft portion 28 is inserted and rotatably supported, and which moves in a direction toward and away from the print head portion 13 by a displacement mechanism. The second roller mechanism 21 has a roller holder 22 that moves in a direction toward and away from the print medium by the displacement mechanism, a second shaft portion 30 that is rotatably supported by the roller holder 22 and has a second gear 31 at a first side portion along the axial direction, a hollow cylindrical sub-roller 20 through which the second shaft portion 30 is inserted and which can tilt about the axial center of the second shaft portion 30, an engagement groove 20c recessed into the inner surface of the middle portion of the sub-roller 20 in the axial direction, and a protrusion 34 that protrudes from the outer circumferential surface of the second shaft portion 30 and engages with the engagement groove 20c of the sub-roller 20.

[0058] In this manner, the printing device 1 includes a first roller mechanism 19 and a second roller mechanism 21 along the transport path of the transport means. The first roller mechanism 19 includes a platen roller 18 through which the first shaft portion 28 is inserted. The second roller mechanism 21, located downstream of the first roller mechanism 19 in the transport direction, includes a sub-roller 20 through which the second shaft portion 30 is inserted. At this time, the second roller mechanism 21 also includes a roller holder 22 that is moved in a direction toward and away from the print medium by a displacement mechanism. The second shaft portion 30 is provided on the roller holder 22. As a result, the second shaft portion 30 of the sub-roller 20 is configured to move in a direction toward and away from the print medium as appropriate in response to, for example, the tension or transport behavior of the print medium, thereby realizing a so-called centering function.

[0059] Here, the sub-roller 20 is configured in a hollow cylindrical shape, and an engagement groove 20c is recessed into the inner peripheral surface of the hollow cylinder. Meanwhile, a protrusion 34 is provided on the second shaft portion 30 that is inserted into the hollow cylindrical interior of the sub-roller 20, and the protrusion 34 engages with the engagement groove 20c. As a result, a driving force is transmitted from a second gear 31 located at a portion on the first side of the second shaft portion 30 to the second shaft portion 30, and the driving force is transmitted to the sub-roller 20 via the protrusion 34 and the engagement groove 20c.

[0060] In this manner, the driving force of the drive motor 15 is transmitted from the round bar-shaped second shaft portion 30 inside the cylindrical shape to the cylindrical sub-roller 20 located on the outer circumferential side thereof.

[0061] This improves the overall rigidity compared to the conventional structure in which a hollow cylindrical drive shaft is rotated on the outer periphery of an axis provided in a movable case, a hollow cylindrical roller is disposed on the outer periphery of the drive shaft, and the protrusions on the inner periphery of the roller are engaged with the engagement groove of the drive shaft. That is, unlike the conventional structure in which the driving force is transmitted via the cylindrical drive shaft → engagement groove 20c → protrusion 34 → cylindrical roller, the driving force is transmitted via the round bar-shaped second shaft portion 30 → protrusion 34 → engagement groove 20c → cylindrical sub-roller 20, so bending is less likely to occur. This reduces the risk of transport failure even when transporting and printing on a wide print medium.

[0062] As shown in Figs. 11 and 12, the extending direction of the protrusion 34 in the second shaft portion 30 and the extending direction of the second pin 35 in the second shaft portion 30 may be arranged to have a phase difference of approximately 90°.

[0063] In this case, by arranging the protrusion 34 and the second pin 35 with a phase difference of approximately 90° from each other, when transmitting rotation through the above-mentioned path, the influence of the backlash in the engagement between the protrusion 34 and the sub-roller 20 and the influence of the backlash in the fit between the second pin 35 and the second gear 31 do not occur simultaneously but occur at different times. Therefore, the influence of both of these backlashes on the entire second roller mechanism 21 can be reduced.

[0064] Furthermore, when manufacturing the part, the press-fitting of the protrusion 34 into the second shaft portion 30 and the press-fitting of the second pin 35 into the second shaft portion 30 can be performed in separate processes, thereby improving workability during processing.

[0065] The embodiments of the present invention have been described above in detail with reference to the accompanying drawings. However, it goes without saying that the scope of the technical idea of ​​the present invention is not limited to the embodiments described here. It is clear that a person having ordinary knowledge in the technical field to which the present invention belongs can make various changes, modifications, combinations, etc. within the scope of the technical idea of ​​the present invention described in the claims. Therefore, the technologies subsequent to these changes, modifications, combinations, etc. naturally belong to the scope of the technical idea of ​​the present invention.

[0066] Furthermore, while the above-mentioned tape cassette 5 was a type in which printing is performed on a cover tape and then bonded to a base tape, this is not limited to this, and the present invention may also be applied to a type in which printing is performed on a printable tape layer provided on a base tape without using a cover tape (a type in which bonding is not performed).

[0067] Furthermore, the configuration of the tape cassette 5 is not limited to the above configuration. For example, long flat paper-like or rectangular tapes or sheets (including those formed by cutting an appropriate length after unwinding a tape wound on a roll) may be stacked in a predetermined storage section (for example, stacked flat on a tray) to form a cartridge, and this cartridge may be attached to a cartridge holder on the printing device 1 side and transferred and transported from the storage section to perform printing.

[0068] Furthermore, although a configuration has been adopted in which the roller holder 22 is moved toward and away from the print head unit 13 by the lever 17, it is also possible to adopt a configuration in which, for example, the print head unit 13 is moved toward and away from the roller holder 22.

[0069] In addition to the above, the methods according to the above embodiments and their modifications may be used in appropriate combination.

[0070] Although not specifically illustrated, the present invention can be implemented with various modifications without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0071] 1 Printing device 11 Drive roller 13 Print head unit 14 First conveyor section 15 Drive motor 16 Second conveyor section 17 Lever (displacement mechanism) 18 Platen roller 19 First roller mechanism 20 Saburora 21 Second roller mechanism 22 Roller holder (displacement mechanism) 23 Base frame 24 Side frame 25 Axis 26 Spring 27 1st Gear 28 First shaft 29 Movable holder 30 Second shaft 31 2nd Gear 33 Compression spring 34 Protrusion (first pin) 35 2nd pin 36 Mobile

Claims

1. a conveying means for conveying a print medium, the conveying means including a first roller mechanism having a first roller and a second roller mechanism having a second roller, the second roller mechanism being disposed downstream of the first roller mechanism in a conveying direction; a print head that prints on the print medium transported by the transport means; a displacement mechanism that displaces the first roller mechanism and the second roller mechanism to a close position where the first roller mechanism and the second roller mechanism are close to the print head and to a separated position that is farther away than the close position; A printing device comprising: The first roller mechanism includes: a first shaft portion that is rotatably supported and has a first gear at a first side portion along an axial direction; the first roller, through which the first shaft portion is inserted and rotatably supported, and which is moved in a direction toward and away from the print head by the displacement mechanism; having The second roller mechanism includes: a movable holder that is moved in a direction toward and away from the printing medium by the displacement mechanism; a second shaft portion rotatably supported by the movable holder and having a second gear at a portion on a first side along an axial direction; the second roller having a hollow cylindrical shape through which the second shaft portion is inserted and which is tiltable with respect to the axis of the second shaft portion; an engagement groove formed in an inner peripheral surface of the second roller at a middle portion in the axial direction; a protrusion that protrudes from an outer circumferential surface of the second shaft portion and engages with the engagement groove of the second roller, The displacement mechanism includes: a roller holder that moves the first roller mechanism and the second roller mechanism in a direction toward and away from the print head by swinging; The first roller mechanism includes: The roller holder is provided with The first roller is the roller holder is rotatably supported by the roller holder, and the roller holder is pivoted to move in a direction toward and away from the print head; The second roller mechanism includes: the roller holder is disposed at a position downstream of the first roller mechanism along the conveying direction, The movable holder includes: The roller holder is supported and moves in a direction toward and away from the print medium, The roller holder is configured to swing between a retracted position and a printing position, The printing device includes: a third gear meshing with the first gear; a fourth gear meshing with the second gear; A frame that rotatably supports the third gear and the fourth gear Further comprising: The frame is a first through hole and a second through hole through which the first side portion of the first shaft portion and the first side portion of the second shaft portion pass, respectively; The first through hole and the second through hole are The first shaft portion and the second shaft portion are inserted through the first shaft portion and the second shaft portion so as to be movable in a direction perpendicular to a penetration direction, When the roller holder is in the retracted position, the first shaft portion and the second shaft portion do not contact a first edge portion of the first through hole and a second edge portion of the second through hole, respectively; When the roller holder is in the printing position, the first shaft portion and the second shaft portion abut against a first positioning portion provided on the first edge portion and a second positioning portion provided on the second edge portion, respectively. A printing device comprising:

2. A conveying means for conveying a print medium, the conveying means including a first roller mechanism having a first roller; a print head that prints on the print medium transported by the transport means; a displacement mechanism that displaces the first roller mechanism and the print head between a close position where the first roller mechanism and the print head are close to each other and a separated position where the first roller mechanism and the print head are farther apart than the close position; A printing device comprising: The first roller mechanism includes: a first shaft portion that is rotatably supported and has a first gear at a first side portion along an axial direction; the first roller, through which the first shaft portion is inserted and rotatably supported, and which is moved in a direction toward and away from the print head by the displacement mechanism; having The displacement mechanism includes: a roller holder that moves the first roller mechanism toward and away from the print head by swinging; The first roller mechanism includes: The roller holder is provided with The first roller is the roller holder is rotatably supported by the roller holder and moves in a direction toward and away from the print head by the swinging of the roller holder; The roller holder is configured to swing between a retracted position and a printing position, The printing device includes: When the roller holder is in the retracted position, the first shaft portion does not contact the first positioning portion, When the roller holder is in the printing position, the first shaft portion abuts against the first positioning portion. A printing device comprising:

3. A conveying means for conveying the print medium, the conveying means including a second roller mechanism having a second roller; a print head that prints on the print medium transported by the transport means; a displacement mechanism that displaces the second roller mechanism and the print head between a close position where the second roller mechanism and the print head are close to each other and a separated position where the second roller mechanism and the print head are farther apart than the close position; A printing device comprising: The second roller mechanism includes: a movable holder that is moved in a direction toward and away from the printing medium by the displacement mechanism; a second shaft portion rotatably supported by the movable holder and having a second gear at a portion on a first side along an axial direction; the second roller having a hollow cylindrical shape through which the second shaft portion is inserted and which is tiltable with respect to the axis of the second shaft portion; an engagement groove formed in an inner peripheral surface of the second roller at a middle portion in the axial direction; a protrusion that protrudes from an outer circumferential surface of the second shaft portion and engages with the engagement groove of the second roller, The displacement mechanism includes: a roller holder that moves the second roller mechanism toward and away from the print head by swinging; The movable holder includes: The roller holder is supported and moves in a direction toward and away from the print medium, The roller holder is configured to swing between a retracted position and a printing position, The printing device includes: When the roller holder is in the retracted position, the roller holder does not come into contact with the second positioning portion, When the roller holder is in the printing position, the second shaft portion abuts against a second positioning portion. A printing device comprising:

4. the second shaft portion of the second roller is a metal shaft portion, The protrusion is a first pin extending in a direction perpendicular to an axis of the second shaft portion, the engagement groove of the second roller engages with the first pin, The rotation of the second shaft portion is 2. The printing apparatus according to claim 1, wherein the force is transmitted to the second roller via the first pin and the engagement groove which are engaged with each other.

5. The second roller mechanism includes: A second pin is provided protruding from an outer circumferential surface of the second shaft portion and extending in a direction perpendicular to an axis of the second shaft portion, the second gear is engaged with the second pin, The rotation of the second gear is 5. The printing device according to claim 4, wherein the force is transmitted to the second shaft portion via the second pin that engages with the second shaft portion.

6. 6. The printing device according to claim 5, wherein a phase difference between an extending direction of the first pin in the second shaft portion and an extending direction of the second pin in the second shaft portion is approximately 90 degrees.

7. A printing device as described in any one of claims 1, 4, 5, and 6, characterized in that an end face of the second roller on the first side along the axial direction and an end face of the second gear on the second side opposite the first side along the axial direction are spaced apart from each other in the axial direction.

8. 7. The printing device according to claim 1, further comprising a biasing means disposed between the roller holder and the movable holder for biasing the movable holder in a direction to approach the print medium.

9. The biasing means is 9. A printing device according to claim 8, characterized in that a first pressing force pressing the movable holder on the first side is configured to be greater than a second pressing force pressing the movable holder on a second side opposite the first side.

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