JP5625632B2 - Ribbon cassette - Google Patents

Description

  The present invention relates to a ribbon cassette that is detachable from a tape printer.

  2. Description of the Related Art Conventionally, a laminate-type tape cassette is known in which a transparent film tape, a double-sided pressure-sensitive adhesive tape having a release paper attached on one side, and an ink ribbon are accommodated (see, for example, Patent Document 1). In such a tape cassette, a film tape, a double-sided adhesive tape and an ink ribbon are each wound around a spool and supported rotatably in the cassette case. In the cassette case, a ribbon take-up spool for pulling out and taking up the ink ribbon from the spool is provided. The ribbon take-up spool is provided with a clutch spring for preventing the ink ribbon from loosening in order to stabilize the take-up of the ink ribbon.

JP-A-8-25768

  In a conventional tape cassette manufacturing process, an operator assembles a ribbon spool and a ribbon take-up spool into a cassette case. Specifically, the operator manually assembled the ribbon spool and the ribbon take-up spool into the lower case, and then assembled the upper case to the lower case.

  However, when the ribbon spool and the ribbon take-up spool are stored in the lower case, the clutch spring attached to the ribbon take-up spool may be entangled with the ink ribbon wound around the ribbon spool. In addition, since the ribbon take-up spool stored in the lower case is not fixed to the lower case, the ribbon take-up spool is likely to tilt or fall during the process of assembling the upper case to the lower case.

  As a result, the ribbon take-up spool and the clutch spring cannot be accurately assembled to the cassette case, which may cause the ribbon take-up spool to rotate poorly and eventually cause the ink ribbon to take up poorly during the printing operation. . As a countermeasure, in the conventional tape cassette manufacturing process, an operator has correctly assembled the ribbon take-up spool into the cassette case. For this reason, the rotation failure of the ribbon take-up spool as described above has been prevented, but the skill of the operator who manufactures the tape cassette is required.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a ribbon cassette that can reduce assembly defects.

A ribbon cassette according to an aspect of the present invention includes a box-shaped cassette case including an upper case having an upper wall and a lower case having a bottom wall, and a tape wound with a tape housed in the cassette case A roll, an ink ribbon housed in the cassette case, a cylindrical ribbon take-up spool for taking up the ink ribbon used for printing, and a coiled annular portion attached to the ribbon take-up spool; A clutch spring that extends from the ring portion and restricts rotation of the ribbon take-up spool in a predetermined direction; and an upper end portion of the ribbon take-up spool provided on the upper wall. an upper rotation supporting portion for rotatably supporting the, provided in the bottom wall, and a lower rotation support portion that rotatably supports the lower portion of the ribbon take-up spool, the supported by the lower rotary support unit In the outer peripheral side of Bonn take-up spool, wherein the bottom wall a substantially circular shape in plan view of the wall portion extending upward, a housing wall forming the recess in which the tape roll is accommodated between the bottom wall, wherein A slit formed in a vertical direction on the storage wall and capable of inserting / removing the locking portion from above, wherein the lower end of the ribbon take-up spool is supported by the lower rotation support portion. The ink ribbon is transported on a transport path so that the width direction of the ink ribbon is parallel to the vertical direction of the cassette case. The locking portion is fixed at a position where a line extending from the annular portion of the locking portion is separated from the transport path.

In the above ribbon cassette, the ribbon take-up spool which is rotatably supported in a cassette case, the ink ribbon used for printing is taken-out winding. The clutch spring that restricts the rotation of the ribbon take-up spool in a predetermined direction has an annular portion attached to the ribbon take-up spool, and an engaging portion fixed to the spring fixing portion of the lower case. A spring fixing | fixed part is a slit formed in the up-down direction in the wall part extended upwards from a bottom wall. The locking portion is fixed at a planar position by the spring fixing portion so that the extension line from the annular portion of the locking portion is separated from the conveyance path.

With this configuration, there is no ink ribbon conveyance path on the extension of the locking portion extending from the annular portion. Therefore, when the ribbon cassette is assembled, if the operator attaches the ribbon winding spool to the lower rotation support portion of the lower case, the latching portion of the clutch spring attached to the ribbon winding spool will transport the ink ribbon. It is fixed by a spring fixing portion at a position separated from the path. As a result, when assembled to the ribbon take-up spool, the latching portion of the clutch spring is less likely to get entangled with the ink ribbon, and the assembly failure of the ribbon cassette can be reduced. Further, when the tape cassette is assembled, it is possible to make it difficult for the clutch spring to come off from the spring fixing portion, and it is possible to improve work efficiency.

Further, the spring fixing portion is a slit formed in the storage wall that forms an area in which the tape roll is stored. Therefore, the spring fixing part can be provided without complicating the internal structure of the tape cassette.

The ribbon cassette includes a support rib that protrudes upward from the bottom wall and extends along a part of an outer periphery of the ribbon take-up spool supported by the lower rotation support portion, and the support rib is the lower rotation in the lower end portion of the ribbon take-up spool is supported by the support portion may hold an installation state of the ribbon take-up spool. In this case, when the operator attaches the ribbon take-up spool to the lower rotation support portion of the lower case, the installation state of the ribbon take-up spool is held by the support rib. Therefore, when the upper case is assembled to the lower case, the ribbon take-up spool can be prevented from being inclined, and the assembly failure of the ribbon cassette can be reduced.
In the ribbon cassette, the ribbon take-up spool takes up the ink ribbon used for printing at a take-up position on the transport path, and faces the inside of the cassette case from the upper wall and the bottom wall. The ribbon take-up spool of the ribbon take-up spool that is rotatably supported by the upper rotation support portion. An upper ribbon support portion that is disposed on the lower side of the upper end portion and protrudes over the entire outer circumference of the ribbon take-up spool; and the ribbon take-up spool that is rotatably supported by the lower rotation support portion. A lower ribbon support part, which is disposed on the upper side of the lower end part and protrudes over the entire circumference of the ribbon take-up spool in the radial direction; the upper ribbon support part; and the lower ribbon support part And the regulation rib includes an upper rib projecting downward from the upper wall and the upper rib so as to face the upper rib. A lower rib protruding upward from the bottom wall, and the vertical width of the winding surface is defined by the distance between the upper ribbon support portion and the lower ribbon support portion, and at least the length in the width direction of the ink ribbon The distance between the upper rib and the lower rib is smaller than the vertical width of the winding surface, and at least one of the upper rib and the lower rib is wound on the winding surface. When the winding diameter of the ink ribbon becomes a predetermined value or more, the width of the ink ribbon that is in contact with the end portion in the width direction of the ink ribbon and is transported at an appropriate vertical position on the transport path Based on center position The distance to the projecting end of the upper rib is smaller than the distance to the upper ribbon support part, and the distance to the projecting end of the lower rib is smaller than the distance to the lower ribbon support part. Also good. In this case, the used ink ribbon can be properly wound around the ribbon take-up spool.

2 is a plan view of the tape cassette 1. FIG. FIG. 3 is a plan view of the tape cassette 1 with an upper case 31A removed, showing a state where the winding diameter of the ink ribbon 60 is less than a predetermined value. It is an arrow direction sectional view in the AA line of FIG. It is the perspective view seen from diagonally upward of lower case 31B. It is the perspective view seen from diagonally downward of upper case 31A. It is a partial expansion perspective view of lower case 31B with which the ink ribbon unit was mounted. It is a partial expansion perspective view of upper case 31A with which the ink ribbon unit was mounted. FIG. 4 is an enlarged longitudinal sectional view of the periphery of a ribbon take-up spool when the take-up diameter of the ink ribbon is less than a predetermined value and the ink ribbon is not meandering in the width direction. FIG. 3 is a plan view of the tape cassette 1 with an upper case 31A removed, showing a state where the winding diameter of the ink ribbon 60 is equal to or greater than a predetermined value. FIG. 5 is an enlarged longitudinal sectional view of the vicinity of a ribbon take-up spool 44 when the ink ribbon 60 meanders in the width direction when the take-up diameter of the ink ribbon 60 is less than a predetermined value. FIG. 4 is an enlarged longitudinal sectional view of the periphery of a ribbon take-up spool 44 when the ink ribbon 60 meanders in the width direction when the take-up diameter of the ink ribbon 60 is equal to or greater than a predetermined value.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings. Note that the drawings to be referred to are used for explaining the technical features that can be adopted by the present invention, and the configuration of the described apparatus is not intended to be limited thereto, but is merely an illustrative example. is there.

  The tape cassette 1 according to this embodiment will be described later with reference to FIGS. In the description of this embodiment, the upper side, lower side, left side, and right side of FIGS. 1 and 2 are the front side, rear side, left side, and right side of the tape cassette 1, respectively. Moreover, let the upper side and lower side of FIG. 3 be the upper side and lower side of the tape cassette 1. FIG. Below, the tape cassette 1 which mounted the general purpose cassette which can be mounted in various tape types in the laminate type is illustrated.

  1 to 8 and 10 show a state where the winding diameter of the ink ribbon 60 is less than a predetermined value. 9 and 11 show a state where the winding diameter of the ink ribbon 60 is greater than or equal to a predetermined value. The winding diameter of the ink ribbon 60 is the diameter of the ink ribbon 60 wound on the ribbon winding spool 44. 8, FIG. 10 and FIG. 11 are longitudinal sectional views in which the periphery of the ribbon take-up spool 44 shown in FIG. 3 is partially enlarged in a state where the take-up diameter of the ink ribbon 60 is different.

  With reference to FIGS. 1-3, the whole structure of the tape cassette 1 is demonstrated. As shown in FIGS. 1 to 3, the tape cassette 1 has a cassette case 31 that is a substantially rectangular parallelepiped (box-shaped) casing having rounded corners in plan view as a whole. The cassette case 31 includes a lower case 31B and an upper case 31A assembled in the vertical direction with respect to the lower case 31B. Of the upper case 31 </ b> A, a wall portion that forms the upper surface of the cassette case 31 is referred to as an upper wall 301. Of the lower case 31 </ b> B, a wall portion forming the bottom surface of the cassette case 31 is referred to as a bottom wall 302.

  In the cassette case 31, a double-sided adhesive tape 58, a transparent film tape 59, and an ink ribbon 60 are accommodated. The double-sided pressure-sensitive adhesive tape 58 is a double-sided tape having a release paper attached on one side, and is attached to the printing surface side of the printed film tape 59. The double-sided adhesive tape 58 is wound around the first tape spool 40 with the release paper facing outward. The film tape 59 is wound around the second tape spool 41. The ink ribbon 60 is wound around the ribbon spool 42. The double-sided adhesive tape 58, the film tape 59, and the ink ribbon 60 are transported on their transport paths so that their width directions are parallel to the vertical direction of the cassette case 31.

  The double-sided adhesive tape 58 is stored in a first tape storage portion 101 provided at the left rear portion (the upper left portion in FIGS. 1 and 2) in the cassette case 31. In the first tape storage unit 101, the first tape spool 40 around which the double-sided adhesive tape 58 is wound is rotatably supported by the support unit 65. The support portion 65 includes a cylindrical body 65B (see FIG. 4) that protrudes upward from the bottom wall 302, and a cylindrical receiving portion 65A (see FIG. 5) that is provided on the upper wall 301 and to which the tip of the cylindrical body 65B is coupled. ). The first tape spool 40 is rotationally supported in a state in which the cylindrical body 65B connected to the tube receiving portion 65A is inserted into the shaft hole of the first tape spool 40.

  The film tape 59 is stored in a second tape storage portion 102 provided at the right rear portion (upper right portion in FIGS. 1 and 2) in the cassette case 31. In the second tape storage portion 102, the second tape spool 41 around which the film tape 59 is wound is rotatably supported by the support portion 66. The support portion 66 includes a shaft portion 66B that protrudes upward from the bottom wall 302 (see FIG. 4), and a bearing portion 66A that is provided on the upper wall 301 and to which the tip of the shaft portion 66B is coupled (see FIG. 5). Including. The second tape spool 41 is rotationally supported in a state in which the shaft portion 66B connected to the bearing portion 66A is inserted into the shaft hole of the second tape spool 41.

  The ink ribbon 60 is stored in an ink ribbon storage portion 103 provided at the right front portion (lower right portion in FIGS. 1 and 2) in the cassette case 31. In the ink ribbon storage unit 103, the ribbon spool 42 around which the ink ribbon 60 is wound is rotatably supported by the support unit 68. The support portion 68 includes a shaft portion 68B (see FIG. 4) that protrudes upward from the bottom wall 302, and a bearing portion 68A (see FIG. 5) that is provided on the upper wall 301 and to which the tip of the shaft portion 68B is coupled. Including. The ribbon spool 42 is rotationally supported in a state in which the shaft portion 68B connected to the bearing portion 68A is inserted into the shaft hole of the ribbon spool 42.

  A support portion 64 is provided at the left front corner of the cassette case 31 (the lower left corner in FIGS. 1 and 2). The support part 64 includes a pair of openings 64A and 64B (see FIGS. 4 and 5) penetrating the top wall 301 and the bottom wall 302 in the vertical direction. The upper and lower ends of the tape drive roller 46 are inserted into the pair of openings 64A and 64B, respectively, and are rotatably supported. The tape drive roller 46 pulls out the film tape 59 and the double-sided adhesive tape 58.

  A ribbon take-up spool 44 is rotatably supported by a support portion 67 between the first tape spool 40 and the ribbon spool 42 in the cassette case 31. The support portion 67 includes a pair of openings 67A and 67B (see FIGS. 4 and 5) that penetrate the top wall 301 and the bottom wall 302 in the vertical direction and support both end sides of the ribbon take-up spool 44. The ribbon take-up spool 44 pulls out the ink ribbon 60 from the ribbon spool 42 and takes up the ink ribbon 60 used for printing characters or the like. The support portion 67 and the ribbon take-up spool 44 will be described in detail separately.

  When the tape cassette 1 is mounted on a tape printer (not shown) and a printing operation is executed, the tape drive roller 46 is rotationally driven via a tape drive shaft (not shown) of the tape printer. The tape drive roller 46 pulls out the film tape 59 from the second tape spool 41 and pulls out the double-sided adhesive tape 58 from the first tape spool 40 in cooperation with a movable conveyance roller (not shown) of the tape printer. A ribbon take-up spool 44 that is rotationally driven via a ribbon take-up shaft (not shown) of the tape printer draws the ink ribbon 60 from the ribbon spool 42 in synchronization with the print speed.

  The second tape spool 41 rotates clockwise in plan view as the film tape 59 is pulled out. The film tape 59 pulled out from the second tape spool 41 is conveyed toward the right front corner of the cassette case 31 (lower right corner in FIGS. 1 and 2). At the right front corner of the cassette case 31, the film tape 59 is conveyed along the outer periphery of the ink ribbon 60 wound around the ribbon spool 42 and at a distance from the ink ribbon 60.

  A bent portion 33 is erected at the right front corner of the cassette case 31. The bent portion 33 is a pin that bends the film tape 59 in the acute direction along the outer periphery of the ribbon spool 42 around which the ink ribbon 60 is wound. In the bent portion 33, the transport path of the film tape 59 is bent toward the left front corner of the cassette case 31.

  The ribbon spool 42 rotates counterclockwise in plan view as the ink ribbon 60 is pulled out. The ink ribbon 60 pulled out from the ribbon spool 42 is conveyed toward the left front corner of the cassette case 31. Similarly, the first tape spool 40 rotates counterclockwise in plan view as the double-sided adhesive tape 58 is pulled out. The double-sided adhesive tape 58 pulled out from the first tape spool 40 is conveyed toward the left front corner of the cassette case 31.

  Inside the arm portion 34 extending to the left from the right front portion of the tape cassette 1, the film tape 59 drawn from the second tape spool 41 and the ink ribbon 60 drawn from the ribbon spool 42 are guided together. In the opening 34A formed on the distal end side of the arm portion 34, the film tape 59 and the ink ribbon 60 passing through the arm portion 34 are overlapped. The film tape 59 and the ink ribbon 60 are discharged toward the opening 77 provided on the front surface side of the tape cassette 1 through the opening 34A.

  A head insertion portion 39 is provided on the front side of the cassette case 31 and on the left side of the ink ribbon storage portion 103. The head insertion part 39 is a part into which a thermal head (not shown) of the tape printer is inserted. The head insertion portion 39 is connected to the outside on the front side of the tape cassette 1 through the opening 77. The film tape 59 discharged to the opening 77 is printed by a thermal head (not shown) using the ink ribbon 60 superimposed on the film tape 59.

  The film tape 59 on which printing has been performed by a thermal head (not shown) is conveyed toward the tape drive roller 46. The double-sided adhesive tape 58 drawn out from the first tape spool 40 is guided and wound between the tape driving roller 46 and the movable conveying roller (not shown). At this time, the double-sided pressure-sensitive adhesive tape 58 is laminated and stuck on the printing surface of the printed film tape 59. The printed film tape 59 (that is, the printed tape 50) to which the double-sided adhesive tape 58 is attached is further conveyed toward the tape discharge port 49 and cut by a cutting mechanism (not shown) of the tape printer. .

  The ink ribbon 60 used for printing by a thermal head (not shown) is separated from the film tape 59 by a guide wall 47 erected on the right side of the tape drive roller 46, and then toward the ribbon take-up spool 44. Guided. A bent portion 36 is erected on the left front side of the ribbon take-up spool 44. The bending portion 36 is a pin that bends the transport direction of the ink ribbon 60 toward a winding position described later. The ink ribbon 60 that passes through the bent portion 36 is taken up by the ribbon take-up spool 44.

  The structure around the ribbon take-up spool 44 in the cassette case 31 (that is, the upper case 31A and the lower case 31B) will be described with reference to FIGS. 4 and 5, the first tape spool 40, the ribbon take-up spool 44, the double-sided adhesive tape 58, the tape driving roller 46, etc. are removed for easy understanding.

  As shown in FIG. 3, the ribbon take-up spool 44 is a cylindrical body having a height substantially equal to the height of the cassette case 31. At the upper end edge and the lower end edge of the ribbon take-up spool 44, flange-like support portions 44E that protrude along the entire outer circumference are provided. The vertical lengths of the upper support portion 44E and the lower support portion 44E are slightly larger than the width of the ink ribbon 60. Of the outer peripheral surface of the ribbon take-up spool 44, the peripheral surface between the upper support portion 44E and the lower support portion 44E is a take-up surface 44F around which the used ink ribbon 60 is wound.

  Inside the cassette case 31, the upper end 44A of the ribbon take-up spool 44 is fitted into the opening 67A, and the lower end 44B is fitted into the opening 67B. Since the support portion 44E is in contact with the lower surface of the upper wall 301 at the upper end edge of the ribbon take-up spool 44, the upward movement of the ribbon take-up spool 44 is restricted. At the lower edge of the ribbon take-up spool 44, the support portion 44E is in contact with the upper surface of the bottom wall 302, so that the downward movement of the ribbon take-up spool 44 is restricted. Thereby, the ribbon take-up spool 44 is rotatably supported by the upper end portion 44A and the lower end portion 44B.

  A shaft hole 44 </ b> C penetrating in the vertical direction is formed in the ribbon take-up spool 44. On the inner peripheral surface of the ribbon take-up spool 44 (that is, the inner wall forming the shaft hole 44C), a plurality of ribs 44D extending upward from the lower end portion are provided. When the tape cassette 1 is mounted on the cassette mounting portion (not shown) of the tape printer, the ribbon take-up shaft (not shown) of the tape printer is inserted into the shaft hole 44C through the opening 67B. Within the shaft hole 44C, a plurality of cam members (not shown) provided on the ribbon take-up shaft mesh with the plurality of ribs 44D. Thereby, the rotation of the ribbon take-up shaft is transmitted to the ribbon take-up spool 44.

  As shown in FIGS. 2 to 4, a clutch spring 72 is attached to the lower end portion of the ribbon take-up spool 44. The clutch spring 72 is a coil spring including an annular portion 72A and a locking portion 72B. The annular portion 72A is a coil wound just below the lower support portion 44E. The locking portion 72B is a tip portion of the coil that extends outward from the end of the annular portion 72A. The locking portion 72B is fitted in the spring mounting groove 67C of the lower case 31B. The spring mounting groove 67C is a groove portion extending rearward (upward in FIG. 4) from the opening 67B in the bottom wall 302.

  Of the wall portions extending upward from the bottom wall 302, the peripheral wall defining the second tape storage portion 102 having a substantially circular shape in plan view is referred to as a storage wall 120. That is, the storage wall 120 is a wall portion that forms a recess in which the second tape spool 41 is stored with the bottom wall 302. The spring mounting groove 67C extends rearward to a position reaching the storage wall 120 in plan view. The storage wall 120 has a groove 120A that extends upward from the spring mounting groove 67C.

  A spring fixing wall 45 extending upward from the bottom wall 302 across the spring mounting groove 67 </ b> C is erected slightly forward of the storage wall 120. That is, the storage wall 120 and the spring fixing wall 45 are wall portions that extend upward from the bottom wall 302 on the outer peripheral side of the ribbon take-up spool 44 fitted into the opening 67B. The spring fixing wall 45 is also formed with a groove portion 45A extending upward from the spring mounting groove 67C. The groove portions 45A and 120A are slits through which the locking portion 72B can be inserted and removed from the upper side, and are spring fixing portions 80 for fixing the locking portion 72B of the clutch spring 72.

  When the ribbon take-up spool 44 is attached, the locking portion 72B is fitted into the spring mounting groove 67C from above via the spring fixing portion 80. The distal end portion of the locking portion 72B is bent upward. The bent tip of the locking portion 72B is fixed in the spring fixing portion 80. The clutch spring 72 applies a large rotational load to the ribbon take-up spool 44 when an external force is applied to rotate the ribbon take-up spool 44 in a direction opposite to the take-up direction of the ink ribbon 60 (clockwise direction).

  Of the wall portion extending upward from the bottom wall 302, the rail-like protrusion formed so as to form a substantially circular shape outside the diameter of the opening 67B in plan view is referred to as a support rib 130. The support rib 130 has a plurality of arc walls that form an arc shape in plan view. Specifically, the support rib 130 includes an arc wall 130A provided from the right front side to the front side of the opening 67B, an arc wall 130B provided from the right rear side to the right side of the opening 67B, and an opening. And an arc wall 130C provided from the left side to the rear side of the portion 67B.

  The support rib 130 is provided along a part of the outer periphery of the ribbon take-up spool 44 in a state where the lower end portion 44B of the ribbon take-up spool 44 is fitted into the opening 67B. Further, the support rib 130 forms a recess with the bottom wall 302 into which the lower support portion 44E of the ribbon take-up spool 44 is fitted. Therefore, the formation position and height of the support rib 130 (that is, the protruding width from the bottom wall 302) are defined based on the support portion 44E. That is, the inner diameter of the support rib 130 is slightly larger than the outer diameter of the support portion 44E. Further, the height of the support rib 130 is at least larger than the thickness (vertical length) of the support portion 44E.

  On the left front side of the opening 67B, a lower regulating rib 131 that is a rail-like projection similar to the supporting rib 130 is provided. The lower restricting rib 131 includes a first lower rib 131A and a second lower rib 131B. Similar to the support rib 130, the first lower rib 131A is a rib having an arc shape along the opening 67B, and is provided between the arc wall 130A and the arc wall 130C. The second lower rib 131B extends forward from the front end side of the first lower rib 131A, and is connected to a side wall (specifically, a peripheral wall forming the head insertion portion 39) of the lower case 31B on the extension. .

  As shown in FIG. 5, the upper case 31 </ b> A is also provided with an upper restriction rib 132 that is a rail-shaped protrusion corresponding to the lower restriction rib 131. Specifically, the upper regulating rib 132 is provided on the left front side (the upper left side in FIG. 5) of the opening 67A, and the first upper rib 132A and the second upper rib 132B are connected to each other. The first upper rib 132A is a rib having an arc shape along the opening 67A provided so as to correspond to the first lower rib 131A vertically. The second upper rib 132B includes a first upper rib 132A and a side wall of the upper case 31A (specifically, a peripheral wall forming the head insertion portion 39) provided so as to correspond to the second lower rib 131B vertically. It is a connecting rib.

  With reference to FIG. 2 and FIG. 6 to FIG. 11, the mounting mode of the ribbon take-up spool 44 and the transport path of the ink ribbon 60 will be described. 6 and 7 illustrate the internal structure of the cassette case 31 to which only the ink ribbon 60, the ribbon take-up spool 44, and the ribbon spool 42 are attached for easy understanding. However, FIG. 6 shows the inside of the cassette case 31 (that is, the upper surface side of the lower case 31B) in a state where the upper case 31A is removed. FIG. 7 shows the inside of the cassette case 31 (that is, the lower surface side of the upper case 31A) with the lower case 31B removed.

  As shown in FIGS. 2 and 6, when the tape cassette 1 is manufactured, the operator first assembles the ink ribbon unit into the lower case 31B. The ink ribbon unit includes a ribbon spool 42 around which the ink ribbon 60 is wound, and a ribbon take-up spool 44 to which the leading end of the ink ribbon 60 drawn out from the ribbon spool 42 is connected. A clutch spring 72 is attached in advance to the lower end 44B (see FIG. 4) of the ribbon spool 42.

  Specifically, first, the operator fits the lower end 44B of the ribbon take-up spool 44 into the opening 67B (see FIG. 3). At this time, the locking portion 72B is directed to the grooves 45A and 120A (that is, the springs) while the locking portion 72B of the clutch spring 72 mounted on the ribbon take-up spool 44 is directed rearward (upward in FIGS. 2 and 6). Insert into the fixing part 80) from above. Thereby, the locking portion 72B is fitted into the spring mounting groove 67C and is fixed by the spring fixing portion 80 of the lower case 31B.

  Next, the operator inserts the shaft portion 68 </ b> B (see FIG. 4) into the shaft hole of the ribbon spool 42. At this time, the ink ribbon 60 extending from the ribbon spool 42 to the ribbon take-up spool 44 is drawn around in the lower case 31B to set the transport path of the ink ribbon 60. That is, the ink ribbon 60 extending between the ribbon spool 42 and the ribbon take-up spool 44 is disposed so as to pass through the inside of the arm portion 34, the opening 34 </ b> A, the guide wall 47, and the bent portion 36.

  The spring fixing portion 80 of the present embodiment is provided on the rear side of the opening 67B. On the other hand, the transport path of the ink ribbon 60 (that is, the arrangement position of the ink ribbon 60 from the ribbon spool 42 to the ribbon take-up spool 44) is provided on the front side of the opening 67B. Therefore, in a state where the locking portion 72B is fixed by the spring fixing portion 80, an extension line from the annular portion 72A of the locking portion 72B (a line extending rearward from the ribbon take-up spool 44 in FIGS. 2 and 6). Is separated from the transport path of the ink ribbon 60. In other words, there is no conveyance path for the ink ribbon 60 on the extension of the locking portion 72B extending from the annular portion 72A.

  With this configuration, when the operator inserts the lower end portion 44B of the ribbon take-up spool 44 into the opening 67B when the tape cassette 1 is assembled, the locking portion 72B is separated from the transport path of the ink ribbon 60 by the spring fixing portion 80. It is fixed at such a planar position. As a result, at the time of assembling the ribbon take-up spool 44, it is possible to reduce the possibility that the locking portion 72B contacts the ink ribbon 60 and is damaged. As a result, the engaging portion 72B is not easily entangled with the ink ribbon 60, and the assembly failure of the tape cassette 1 can be reduced.

  Further, the locking portion 72B can be fixed at a position away from the transport path of the ink ribbon 60 by a simple work process of inserting the locking portion 72B into the spring fixing portion 80 from above. As a result, when the tape cassette 1 is assembled, it is possible to make it difficult for the clutch spring 72 to be removed from the spring fixing portion 80, thereby improving the working efficiency. Furthermore, since a part of the spring fixing portion 80 (that is, the groove portion 120A) is provided on the storage wall 120, the spring fixing portion 80 can be provided without complicating the internal structure of the tape cassette 1.

  When the ribbon take-up spool 44 is assembled, the support portion 44 </ b> E of the ribbon take-up spool 44 is fitted into the recess formed by the bottom wall 302 and the support rib 130. That is, when the ribbon take-up spool 44 is fitted into the opening 67B, the standing state of the ribbon take-up spool 44 is held by the support ribs 130 that surround the outer peripheral side of the support portion 44E. Therefore, when the upper case 31A is assembled to the lower case 31B, the ribbon take-up spool 44 can be prevented from being inclined, and the assembly failure of the tape cassette 1 can be reduced.

  After assembling the ink ribbon unit to the lower case 31B, the operator assembles the tape driving roller 46, the double-sided adhesive tape unit, and the film tape unit to the lower case 31B. The double-sided adhesive tape unit is the first tape spool 40 around which the double-sided adhesive tape 58 is wound. The film tape unit is a second tape spool 41 around which a film tape 59 is wound. Specifically, the operator fits the lower end of the tape drive roller 46 into the opening 64B (see FIG. 4), inserts the cylindrical body 65B (see FIG. 4) into the shaft hole of the first tape spool 40, and 2 The shaft portion 66B (see FIG. 4) is inserted into the shaft hole of the tape spool 41.

  Then, the double-sided pressure-sensitive adhesive tape 58 drawn from the first tape spool 40 is drawn around in the lower case 31B, and the conveyance path of the double-sided pressure-sensitive adhesive tape 58 is set. That is, the double-sided adhesive tape 58 is arranged so as to pass through the tape drive roller 46 and the tape discharge port 49. Further, the film tape 59 drawn out from the second tape spool 41 is drawn around in the lower case 31B, and the conveyance path of the double-sided adhesive tape 58 is set. That is, the double-sided adhesive tape 58 is disposed so as to pass through the bent portion 33, the inside of the arm portion 34, the opening 34 </ b> A, and the tape discharge port 49.

  Finally, the upper case 31A is assembled to the lower case 31B. At this time, the upper end of the tape drive roller 46 is fitted into the opening 64A (see FIG. 5). The upper end part of the cylindrical body 65B is connected to the cylinder receiving part 65A (see FIG. 5). The upper end portion of the shaft portion 66B is connected to the bearing portion 66A (see FIG. 5). The upper end of the ribbon take-up spool 44 is fitted into the opening 67A (see FIG. 5). The upper end portion of the shaft portion 68B is connected to the bearing portion 68A (see FIG. 5). Thus, the manufacture of the tape cassette 1 is completed.

  As shown in FIGS. 2, 6, and 7, in the state immediately after the assembly of the tape cassette 1 is completed, the diameter of the ink ribbon 60 wound around the ribbon spool 42 (hereinafter referred to as the winding diameter of the ink ribbon 60). ) Is maximum, while the winding diameter of the ink ribbon 60 in the ribbon winding spool 44 is minimum. As the winding diameter of the ink ribbon 60 is smaller, the position where the ribbon winding spool 44 starts winding (hereinafter referred to as the winding position) on the ribbon winding spool 44 is the inner side of the ribbon winding spool 44 (FIG. 2). Then move upward).

  As the winding position of the ink ribbon 60 moves to the inside of the diameter of the ribbon winding spool 44, the bending rate of the transport path of the ink ribbon 60 by the bending portion 36 decreases. When the winding diameter of the ink ribbon 60 is less than the predetermined value, the ink ribbon 60 is conveyed rightward from the bent portion 36 and passes between the first lower rib 131A and the arc wall 130C in plan view. It reaches the ribbon take-up spool 44. In this state, the front surface of the ink ribbon 60 is along the rear end portions of the first lower rib 131A and the first upper rib 132A when passing between the first lower rib 131A and the arc wall 130C.

  As shown in FIG. 8, the vertical length (distance L1) between the pair of upper and lower support portions 44E, 44E in the ribbon take-up spool 44 is larger than the vertical length (that is, the width length) of the ink ribbon 60. It is. The vertical length (distance L2) between the upper wall 301 and the bottom wall 302 between the first lower rib 131A and the arc wall 130C is also larger than the width of the ink ribbon 60. The distance L1 and the distance L2 substantially coincide with each other in the height position at the center in the vertical direction. Therefore, when the winding diameter of the ink ribbon 60 is less than the predetermined value, the ink ribbon 60 is transported between the first lower rib 131A and the arc wall 130C without being interfered in the width direction by other members. . Then, the ink ribbon 60 that has reached the winding position is wound on the winding surface 44F of the ribbon winding spool 44 as it is.

  As shown in FIG. 9, for example, as the printing operation is performed and the winding diameter of the ink ribbon 60 is increased, the winding position of the ink ribbon 60 is directed to the outer side of the ribbon winding spool 44 (lower side in FIG. 9). Move. Along with this, the bending rate of the conveyance path of the ink ribbon 60 by the bending portion 36 increases. When the winding diameter of the ink ribbon 60 is greater than or equal to a predetermined value, the ink ribbon 60 is conveyed from the bent portion 36 in the front right direction, and has a position overlapping the first lower rib 131A and the first upper rib 132A in plan view. Via the ribbon take-up spool 44.

  At this time, the ink ribbon 60 is transported between the first lower rib 131A and the first upper rib 132A that face each other in the vertical direction. The vertical length (distance L3) between the first lower rib 131A and the first upper rib 132A is smaller than the distance L1 (see FIG. 8). The distance L1 and the distance L3 are substantially the same in height position at the center in the vertical direction. Note that the width of the ink ribbon 60 of the present embodiment is set to be substantially equal to the distance L3.

  When the winding diameter of the ink ribbon 60 is equal to or larger than a predetermined value, both end portions (that is, the upper end portion and the lower end portion) of the ink ribbon 60 are in contact with the first lower rib 131A and the first upper rib 132A. Thus, the ink ribbon 60 is conveyed. In this case, if the ink ribbon 60 is conveyed at an appropriate height position, the ink ribbon 60 is conveyed to the winding position while being regulated in the width direction by the first lower rib 131A and the first upper rib 132A. It is wound as it is on the winding surface 44F of the winding spool 44. The state in which the ink ribbon 60 is conveyed at an appropriate height position refers to a state in which the center position in the width direction of the ink ribbon 60 and the height position at the center in the vertical direction of the distance L2 substantially coincide with each other.

  By the way, when an abnormal operation state (for example, vibration during a printing operation) occurs, the ink ribbon 60 may meander in the width direction. When the ink ribbon 60 meanders in the width direction, the ink ribbon 60 is wound on the ribbon take-up spool 44 in the following manner according to the take-up diameter of the ink ribbon 60.

  First, when the winding diameter of the ink ribbon 60 is less than a predetermined value (see FIGS. 2 and 6 to 8), the ink ribbon 60 is positioned at the upper end position of the distance L1 or according to the height relationship of the distances L1 and L2. There is a possibility of reaching the winding position while meandering in the width direction beyond the lower end position. In the example shown in FIG. 10, the ink ribbon 60 meanders slightly above the proper height position just before the winding position. As a result, the upper end position of the ink ribbon 60 has reached a position higher than the upper end position of the distance L1.

  However, in a state where the winding diameter of the ink ribbon 60 is small, the amount of the ink ribbon 60 wound around the winding surface 44F is small, so that the allowable amount of the ink ribbon 60 that the ribbon winding spool 44 can wind is small. large. Therefore, the ink ribbon 60 meandering in the width direction contacts the support portion 44E (specifically, the lower surface of the upper support portion 44E or the upper surface of the lower support portion 44E). In this case, the ink ribbon 60 is wound while its upper edge is bent in an arc shape, or its upper edge is bent to the side opposite to the winding surface 44F and deformed into a substantially U-shaped cross section. It is wound on the surface 44F. Thus, the ink ribbon 60 is prevented from riding on the winding end portion (that is, the pair of support portions 44E and 44E) of the ribbon winding spool 44.

  On the other hand, when the winding diameter of the ink ribbon 60 is large (see FIG. 9), the amount of the ink ribbon 60 wound around the winding surface 44F is large, so that the ribbon ribbon spooling spool 44 can wind up. 60 tolerance is small. Therefore, the ink ribbon 60 meandering in the width direction cannot be sufficiently wound on the winding surface 44F. As a result, there is a possibility that the ink ribbon 60 meandering in the width direction does not completely fit on the winding surface 44F and rides on the winding end of the ribbon winding spool 44. However, in the tape cassette 1 of the present embodiment, the meandering of the meandering ink ribbon 60 onto the winding end of the ribbon take-up spool 44 is suppressed as follows.

  In the example shown in FIG. 10, as the winding diameter of the ink ribbon 60 further increases, the front surface of the ink ribbon 60 and the first upper rib 132A gradually approach each other. When the winding diameter of the ink ribbon 60 reaches a predetermined amount or more, the upper end edge on the front side of the ink ribbon 60 and the first upper rib 132A come into contact as in the example shown in FIG. Therefore, when the ink ribbon 60 passes through the first upper rib 132A, the upper end edge of the ink ribbon 60 is bent rearward and deformed into a substantially U-shaped cross section. Further, the ink ribbon 60 is wound around the winding surface 44F of the ribbon winding spool 44 while the upper edge is bent.

  That is, before the ink ribbon 60 is taken up by the ribbon take-up spool 44, the upper end edge of the ink ribbon 60 is bent so that the upper end position of the ink ribbon 60 does not become higher than the upper end position of the distance L2. In other words, the upper end position of the ink ribbon 60 is regulated so as not to exceed the vertical range of the distance L1. Therefore, the ink ribbon 60 taken up by the ribbon take-up spool 44 is appropriately suppressed from riding on the upper support portion 44E.

  When the ink ribbon 60 meandering upward comes into contact with the first upper rib 132A, the upper edge of the ink ribbon 60 is folded in a smooth and reliable manner so that it has a U-shape with a small curvature. On the other hand, when the ink ribbon 60 meandering upward comes into contact with the upper support portion 44E, the upper edge of the ink ribbon 60 runs up to be dragged to the lower surface of the support portion 44E. Alternatively, it is bent in an arc shape while it is on the board. In other words, the ink ribbon 60 meandering upward has a lower bending rate at the upper edge when bent in contact with the first upper rib 132A than in bending when in contact with the upper support portion 44E ( That is, the size of the bent upper end edge in the thickness direction is small).

  As shown in FIG. 11, when the ink ribbon 60 is in contact with the upper support portion 44 </ b> E, the upper end edge is U-shaped or arc-shaped with a large curvature, so that the winding width of the ink ribbon 60 (in other words, , The interval width between the portion of the ink ribbon 60 wound around the winding surface 44F and the portion of the ink ribbon 60 on the lower layer side thereof becomes relatively large. In this state, the increasing rate of the winding diameter of the ink ribbon 60 in the ribbon winding spool 44 (in other words, the increasing width every time the ink ribbon 60 wraps around the winding surface 44F) is relatively large. Therefore, when the ribbon take-up spool 44 is taken up, the take-up diameter of the ink ribbon 60 increases rapidly, so that the take-up load of the ink ribbon 60 may increase.

  In this regard, in this embodiment, when the winding diameter of the ink ribbon 60 is increased, the ink ribbon 60 meandering upward comes into contact with the first upper rib 132A, and the upper end edge thereof has a U-shape with a small curvature. Folded in half. Therefore, the winding width of the ink ribbon 60 becomes relatively small, and as a result, the increase rate of the winding diameter of the ink ribbon 60 becomes relatively small. Therefore, during the winding operation of the ribbon winding spool 44, the increase speed of the winding diameter of the ink ribbon 60 is suppressed, so that an increase in the winding load of the ink ribbon 60 can be suppressed.

  On the other hand, although not shown, in a state where the ink ribbon 60 meanders downward, the first lower rib 131A contacts the lower end edge of the ink ribbon 60 from the front side when the winding diameter of the ink ribbon 60 exceeds a predetermined value. . Therefore, when the ink ribbon 60 passes through the first lower rib 131A, the lower end edge of the ink ribbon 60 is bent rearward and deformed into a substantially U-shaped cross section. Further, the ink ribbon 60 is wound around the winding surface 44 </ b> F of the ribbon winding spool 44 while the lower end edge is bent.

  That is, before the ink ribbon 60 is taken up by the ribbon take-up spool 44, the lower end edge of the ink ribbon 60 is bent so that the lower end position of the ink ribbon 60 does not become lower than the lower end position of the distance L2. That is, the lower end position of the ink ribbon 60 is regulated so as not to exceed the vertical range of the distance L1. Therefore, the ink ribbon 60 taken up by the ribbon take-up spool 44 is appropriately suppressed from riding on the lower support portion 44E.

  Note that the ink ribbon 60 meandering downward is bent in contact with the lower support portion 44E when bent in contact with the first lower rib 131A, as in the case of meandering upward. The bending rate of the lower edge is smaller (that is, the thickness of the bent lower edge is smaller). Therefore, during the winding operation of the ribbon winding spool 44, the increase speed of the winding diameter of the ink ribbon 60 is suppressed, so that an increase in the winding load of the ink ribbon 60 can be suppressed.

  As described above, in a state where the ink ribbon 60 meanders in the width direction, when the winding diameter of the ink ribbon 60 becomes a predetermined value or more, the end portion in the width direction of the ink ribbon 60 becomes the first lower rib 131A or the first upper rib. It is bent in contact with 132A. As a result, the ink ribbon 60 is prevented from climbing onto the winding end of the ribbon take-up spool 44, and the increase speed of the take-up diameter of the ink ribbon 60 is suppressed, so that the take-up load of the ink ribbon 60 is small. Become. As a result, the used ink ribbon 60 can be properly wound around the ribbon take-up spool 44.

  Further, the distance L3 between the first lower rib 131A or the first upper rib 132A is smaller than the vertical width of the winding surface 44F (that is, the distance L1 between the pair of support portions 44E and 44E). Therefore, the end portion in the width direction of the ink ribbon 60 that is shifted in the width direction from the appropriate height position prevents the ink ribbon 60 from contacting the end portions of the winding surface 44F (that is, the pair of support portions 44E and 44E). The first lower rib 131A or the first upper rib 132A is bent in contact with the first lower rib 131A. Therefore, the ink ribbon 60 is prevented from being greatly displaced in the width direction from the appropriate height position, the increase speed of the winding diameter of the ink ribbon 60 is suppressed, and the ink ribbon 60 rides on the winding end of the ribbon winding spool 44. This is also suppressed.

  The first lower rib 131A is connected to the side wall of the lower case 31B by the second lower rib 131B. The first upper rib 132A is connected to the side wall of the upper case 31A by the second upper rib 132B. If the second lower rib 131B is not provided, the ink ribbon 60 may be erroneously inserted into a groove formed between the first lower rib 131A and the side wall of the lower case 31B, which may cause, for example, a running failure of the ink ribbon 60. Similarly, when there is no second upper rib 132B, a groove is formed between the first upper rib 132A and the upper case 31A, and the ink ribbon 60 may be inserted by mistake. In that respect, the occurrence of such a state can be suppressed by connecting the first lower rib 131A and the first upper rib 132A to the side wall of the cassette case 31, respectively.

  The first lower rib 131 </ b> A and the first upper rib 132 </ b> A have an arc shape along a part of the outer periphery of the ribbon take-up spool 44 supported by the support portion 67. Therefore, before the ink ribbon 60 is taken up by the ribbon take-up spool 44, the end portion in the width direction of the ink ribbon 60 that is shifted in the width direction from the appropriate height position can be bent smoothly and reliably.

  Further, the bent portion 36 provided on the upstream side of the first lower rib 131 </ b> A in the transport path of the ink ribbon 60 applies a back tension to the ink ribbon 60 on the transport path by contacting the ink ribbon 60. Therefore, the transport path of the ink ribbon 60 can be stabilized, and the ink ribbon 60 can be accurately guided toward the first lower rib 131A and the first upper rib 132A.

  Further, when an abnormal operation situation (for example, vibration during printing operation) occurs, the ribbon take-up spool 44 may be meandered in the width direction (vertical direction). In this case, if the winding diameter of the ink ribbon 60 is equal to or greater than a predetermined value, the fixed height at which the first lower rib 131A or the first upper rib 132A is provided regardless of the vertical position of the ribbon winding spool 44. At the position, the edge of the ink ribbon 60 is bent into a U shape with a small curvature. Thereby, the bending position of the ink ribbon 60 on the ribbon take-up spool 44 can be dispersed in the vertical direction. During the winding operation of the ribbon winding spool 44, the increase speed of the winding diameter of the ink ribbon 60 is suppressed, so that an increase in the winding load of the ink ribbon 60 can be suppressed.

In the above embodiment, the tape cassette 1 corresponds to the “ribbon cassette” of the present invention. The opening 67A corresponds to the “upper rotation support portion” of the present invention, and the opening 67B corresponds to the “lower rotation support portion” of the present invention.

  The tape cassette 1 of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

  In the said embodiment, although the tape cassette 1 mounted in the laminate type was illustrated, this invention is applicable if it is a ribbon cassette in which the ink ribbon was accommodated in the cassette case. For example, the present invention may be applied to a tape cassette mounted in a so-called receptor type in which a printing tape is wound around the second tape spool 41 and an ink ribbon 60 is wound around the ribbon spool 42.

  Further, in the above embodiment, both the upper case 31A and the lower case 31B are provided with regulating ribs (that is, the first lower rib 131A and the first upper rib 132A), but at least one of the upper case 31A and the lower case 31B is provided. A restriction rib may be provided on the surface. In this case, the height position of the regulating rib can be defined as follows.

  That is, when the restriction rib is provided only on the lower case 31B (that is, when only the first lower rib 131A is provided), the height position at the center in the width direction of the ink ribbon 60 being conveyed at an appropriate height position is used as a reference. The distance to the first lower rib 131A only needs to be smaller than the distance to the lower end portion of the winding surface 44F (that is, the lower support portion 44E). Further, when the restriction rib is provided only on the upper case 31A (that is, when only the first upper rib 132A is provided), the height position of the center in the width direction of the ink ribbon 60 being conveyed at an appropriate height position is used as a reference. The distance to the first upper rib 132A only needs to be smaller than the distance to the upper end portion (that is, the upper support portion 44E) of the winding surface 44F.

  In the above embodiment, the spring fixing portion 80 is provided on the rear side of the opening 67B. However, the spring fixing portion 80 is located at a position where the locking portion 72B of the clutch spring 72 can be separated from the ink ribbon 60 and held. May be provided. For example, the spring fixing portion 80 may be provided on the right rear side or the left rear side of the opening 67B in correspondence with the conveyance path of the ink ribbon 60 provided on the front side of the opening 67B.

DESCRIPTION OF SYMBOLS 1 Tape cassette 31 Cassette case 31A Upper case 31B Lower case 36 Bending part 44 Ribbon take-up spool 44A Upper end part 44B Lower end part 44E Support part 44F Winding surface 45 Spring fixed wall 60 Ink ribbon 67A Opening part 67B Opening part 72 Clutch spring 72A Ring portion 72B Locking portion 80 Spring fixing portion 120 Storage wall 130 Support rib 131 Lower restriction rib 131A First lower rib 131B Second lower rib 132 Upper restriction rib 132A First upper rib 132B Second upper rib 301 Upper wall 302 Bottom wall

Claims (3)

A box-shaped cassette case including an upper case having an upper wall and a lower case having a bottom wall;
A tape roll housed in the cassette case and wound with a tape;
An ink ribbon stored in the cassette case;
A cylindrical ribbon take-up spool for taking up the ink ribbon used for printing;
A clutch spring that has a coiled annular part mounted on the ribbon take-up spool and a locking part extending from the annular part, and restricts rotation of the ribbon take-up spool in a predetermined direction; ,
An upper rotation support portion provided on the upper wall and rotatably supporting an upper end portion of the ribbon take-up spool;
A lower rotation support portion provided on the bottom wall and rotatably supporting a lower end portion of the ribbon take-up spool;
On the outer peripheral side of the ribbon take-up spool supported by the lower rotation support portion, a wall portion having a substantially circular shape in plan view extending upward from the bottom wall , the recess for accommodating the tape roll being A storage wall to be formed with the bottom wall ;
A slit formed in the storage wall in the vertical direction and capable of inserting / removing the locking portion from above, wherein the lower end portion of the ribbon take-up spool is supported by the lower rotation support portion. A spring fixing portion for fixing the stopper,
The ink ribbon is transported on a transport path so that the width direction of the ink ribbon is parallel to the vertical direction of the cassette case,
The ribbon cassette, wherein the spring fixing portion fixes the locking portion at a position where a line extending in a direction extending from the annular portion of the locking portion is separated from the conveyance path in plan view. A support rib that protrudes upward from the bottom wall and extends along a part of the outer periphery of the ribbon take-up spool supported by the lower rotation support portion;
2. The ribbon cassette according to claim 1 , wherein the support rib holds an installation state of the ribbon take-up spool in a state where a lower end portion of the ribbon take-up spool is supported by the lower rotation support portion . . The ribbon take-up spool takes up the ink ribbon used for printing at a take-up position on the transport path,
Protruding toward the inside of the cassette case from the upper wall and the bottom wall, and provided with a regulation rib provided on the upstream side of the winding position in the transport path,
The ribbon take-up spool is
An upper ribbon support portion that is disposed below the upper end portion of the ribbon take-up spool that is rotatably supported by the upper rotation support portion, and projects over the entire circumference in the radially outward direction of the ribbon take-up spool;
A lower ribbon support portion that is disposed above the lower end portion of the ribbon take-up spool that is rotatably supported by the lower rotation support portion, and projects over the entire circumference in the radially outward direction of the ribbon take-up spool;
A winding surface that is provided between the upper ribbon support portion and the lower ribbon support portion and that is a circumferential surface around which the ink ribbon is wound;
The regulation rib is
An upper rib protruding downward from the upper wall;
A lower rib protruding upward from the bottom wall so as to face the upper rib,
The vertical width of the winding surface is defined by the distance between the upper ribbon support portion and the lower ribbon support portion, and is at least larger than the width direction length of the ink ribbon,
The distance between the upper rib and the lower rib is smaller than the vertical width of the winding surface,
At least one of the upper rib and the lower rib contacts the end in the width direction of the ink ribbon when the winding diameter of the ink ribbon wound on the winding surface is equal to or greater than a predetermined value. And
The distance to the protruding end of the upper rib is smaller than the distance to the upper ribbon support part, with reference to the center position in the width direction of the ink ribbon being conveyed at an appropriate vertical position on the conveyance path, and The ribbon cassette according to claim 1, wherein a distance to the protruding end of the lower rib is smaller than a distance to the lower ribbon support portion.

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