JP4258442B2 - Ink ribbon cartridge - Google Patents

Description

  The present invention relates to an ink ribbon cartridge that is detachably attached to a printing apparatus main body, and more particularly to a holding member having a drive gear.

  For example, in a printing apparatus (for example, a printer or a facsimile apparatus) that performs printing by a thermal transfer method, a film-like ink ribbon sheet is used. The ribbon is accommodated in an ink ribbon cartridge that is detachably provided on the printing apparatus main body. An ink ribbon cartridge rotates a supply rotation shaft body in which an ink ribbon sheet is wound in a roll shape and a take-up rotation shaft body in which the ink ribbon sheet wound around the supply rotation shaft body is wound in a roll shape around a cartridge frame. The configuration is held as possible. The ink ribbon sheet between the supply rotation shaft body and the take-up rotation shaft body is overlaid on the print paper as the printing medium, and the ink ribbon sheet is heated with a thermal head, so that the dye on the ink ribbon sheet is formed. Printing is performed by transferring onto a print paper. Thereafter, the used portion of the ink ribbon sheet is wound up by the winding rotary shaft body, and the unused portion is supplied from the supply rotary shaft body.

As shown in the following patent document, an ink ribbon cartridge is rotatably supported by a cartridge frame via a pair of holding members each having a supply rotation shaft body and a take-up rotation shaft body attached to respective end portions. Among these, a driving gear to which the driving force of the driving motor on the printing apparatus main body side is applied is provided on the holding member that supports the winding rotary shaft body.
JP 2003-182130 A

  Incidentally, as shown in FIG. 22, a conventional holding member 100 with a drive gear has a gear member 102 having a drive gear 101 and one end side inserted into a recess at the end of the take-up rotary shaft body and from the other end side. The spool member 103 is provided with an elastic piece 104 protruding therefrom. A locking hole 105 into which the elastic piece 104 of the spool member 103 is inserted is formed through the gear member 102 along the rotation axis direction, and the locking hole 105 is formed on the outer surface of the distal end portion of the elastic piece 104. The spool member 103 and the gear member 102 are assembled by the engagement of the locking protrusion 104a. However, in such a configuration, for example, when the spool member 103 is tilted due to an external force applied from the side in the assembled state, the elastic piece 104 receives the force in the direction away from the locking hole 105 and is engaged. There is a problem that the stop protrusion 104a is detached from the locking hole 105, and the spool member 103 and the gear member 102 are easily detached.

  The present invention has been completed based on the above circumstances, and can prevent the first member inserted into the take-up rotary shaft body and the second member with the drive gear from easily separating. An object is to provide a ribbon cartridge.

  As a means for achieving the above object, an ink ribbon cartridge according to the invention of claim 1 supports a cartridge frame and a supply rotary shaft member wound with an ink ribbon sheet so as to be rotatable with respect to the cartridge frame. A supply-side support mechanism, and a take-up rotary shaft body that is disposed at a predetermined interval from the supply rotary shaft body and winds up an ink ribbon sheet wound around the supply rotary shaft body so as to rotate integrally. A pair of support members mounted on each end of the rotary shaft body and rotatably supported by the bearing portion of the cartridge frame, wherein the ink ribbon cartridge comprises: At least one of the support members is inserted into a recess in the end surface of the take-up rotary shaft body in a state in which one end side can rotate integrally with the take-up rotary shaft body. In addition, a cylindrical first member having an opening at the other end side is disposed coaxially with the first member with the cartridge frame interposed therebetween, and one end side is inserted into the opening end of the first member through the bearing portion. And a second member provided with a drive gear on the other end side, and extends toward the insertion direction of the first member on the insertion end side of the second member, and the tip end side thereof is coaxial with the second member. On the other hand, there is provided a bending part that is bent and deformed to the side, and an engagement convex part is provided on one of the inner wall of the first member and the outer surface of the folded part facing the inner wall. And the other is provided with an engagement recess that engages with the engagement projection in an assembled state in which the second member is inserted to a normal position with respect to the first member. .

  According to a second aspect of the present invention, in the ink ribbon cartridge according to the first aspect, an outer surface of the folded portion abuts against an inner wall of the first member in the assembled state.

  According to a third aspect of the present invention, in the ink ribbon cartridge according to the first or second aspect, the flexible portions are a plurality of flexible portions that are paired with each other, and the flexible portions that are paired with each other are the second members. It is characterized by being symmetrically arranged around the central axis.

  According to a fourth aspect of the present invention, in the ink ribbon cartridge according to any one of the first to third aspects, the engaging convex portion is provided in the folded portion of the bent portion, and the engaging concave portion is the first. It is a structure provided on the inner wall of the member, and the engagement convex portion has a shape with a tapered surface that gradually separates from the rotation shaft of the second member toward the drive gear. And

  According to a fifth aspect of the present invention, in the ink ribbon cartridge according to the fourth aspect, there is a gap between the tapered surface of the engaging convex portion and the side wall of the engaging concave portion, and the assembled state is possible. It is characterized by becoming.

  According to a sixth aspect of the present invention, in the ink ribbon cartridge according to any one of the first to fifth aspects, the engaging convex portion is provided in the folded portion of the bent portion, and the engaging concave portion is the first. A structure provided on the inner wall of the member,

  The inner peripheral edge of the opening end of the first member is a tapered surface that gradually increases in diameter in the opening direction.

  According to a seventh aspect of the present invention, in the ink ribbon cartridge according to any one of the first to sixth aspects, the outer peripheral edge of the insertion end of the second member gradually decreases in diameter in the insertion direction. It is characterized by a tapered surface.

<Invention of Claim 1>
According to this configuration, since the folded portion of the bending portion provided on the second member side having the drive gear is configured to bend and deform with the insertion end side as a fulcrum, for example, the first member in the assembled state Even when it is tilted due to an external force applied from the side, the bent portion is bent and deformed along the tilt, so that the engaged state between the engaging convex portion and the engaging concave portion is maintained.

<Invention of Claim 2>
According to this configuration, since the outer surface of the bending portion is in contact with the inner wall of the first member in the assembled state, the first member and the second member can be positioned coaxially.

<Invention of Claim 3>
According to this structure, since the bending part which makes a pair is symmetrically arrange | positioned centering | focusing on the center axis | shaft of a 2nd member, it becomes a more stable assembly | attachment state compared with the case where it arrange | positions asymmetrically.

<Invention of Claim 4>
According to this configuration, the bending portion bends inward and is deformed so as to be guided by the tapered surface formed on the engaging protrusion of the bending portion, and returns in the assembled state. Engage. Therefore, the first member and the second member can be assembled smoothly.

<Invention of Claim 5>
According to this configuration, there is a gap between the tapered surface of the engaging convex portion and the side wall of the engaging concave portion so that the assembled convex portion is engaged with the tapered surface with a slight axial deviation. It is possible to avoid a situation in which the engaged state is easily released by being guided so as to be separated from the mating recess.

<Invention of Claim 6>
According to this configuration, the bending portion bends inwardly and is deformed so as to be guided by the tapered surface of the inner peripheral edge of the opening end of the first member, and returns to the assembled state so that the engaging convex portion and the engaging concave portion are engaged. Match. Therefore, the first member and the second member can be assembled smoothly.

<Invention of Claim 7>
According to this configuration, since the outer peripheral edge of the insertion end of the second member has a tapered surface that gradually decreases in diameter in the insertion direction, the second member can be smoothly inserted into the first member. it can.

An embodiment of the present invention will be described with reference to FIGS.
The ink ribbon cartridge 30 of the present embodiment includes an ink ribbon sheet 23 and is detachably mounted on the apparatus main body of a printing apparatus (printer, facsimile apparatus, multifunction machine, etc.) that performs printing by a thermal transfer method, for example.
In the following description, the side of the facsimile apparatus 1 on which an operation panel 6 described later is provided (for example, the right direction in FIG. 1) is referred to as the front, and the ink ribbon cartridge 30 is also the winding side spool 40 side (for example, FIG. 3). The description will be made assuming that the right direction in the drawing (the lower direction in FIG. 5) is the front.

1. First, the configuration of the facsimile apparatus 1 according to the present invention will be schematically described with reference to FIG.
The facsimile apparatus 1 reads an image or the like from the document 2, transmits the image data as facsimile data to another facsimile apparatus via a communication line such as a telephone line, and other facsimile apparatus via a communication line such as a telephone line. It has a function as a facsimile machine that receives facsimile data transmitted from the printer and forms the image on the recording paper 3 (recording sheet). In addition, the printer has a function as a printer that receives print data transmitted from a personal computer, a word processor, or the like via a printer cable or wireless such as infrared rays and forms an image according to the received data.

  A handset (not shown) is disposed on one side of the main body case 4 of the facsimile apparatus 1 (one end surface side in the depth direction in FIG. 1). The upper cover body 5 that covers the upper surface of the main body case 4 having an open upper surface is pivotally attached to the upper rear end of the main body case 4 so as to be vertically rotatable around a rotation fulcrum 5a at the rear end. An operation panel 6 having a key switch 6a, a liquid crystal display device 6b, and the like is provided on the upper front side of the upper cover body 5. Further, a paper tray 7 for stacking and placing the recording paper 3 in an inclined downward state is provided on the rear of the upper surface of the main body case 4 at the rear of the upper cover body 5. A document table 8 is mounted in the middle.

  In the main body case 4, a document feeding roller 9 a for transporting the document 2 from the document table 8, a pressure contact plate 9 b pressed against the document feeding roller 9 a, and a contact image scanner unit ( CIS) 10, a document pressing body 11 disposed above the reading unit, and a paper discharge roller pair 12 are disposed. In the main body case 4 below the paper tray 7, a paper feed roller 13 for conveying the recording paper 3 from the paper tray 7 one by one and a separation pad urged by a spring 14 on the lower peripheral surface thereof. A paper feed mechanism 16 composed of 15 or the like is provided. Note that the separation pad 15 is provided so that the upstream end can swing with the downstream end in the sheet feeding direction of the recording paper 3 as a fulcrum, and a rubber member 15 a is laid on the surface facing the sheet feeding roller 13.

  Below the sheet feeding mechanism 16, a roller-shaped platen 17 as a printing unit, a thermal head 20 on a heat sink 19 urged by a spring 18 toward the lower surface of the platen 17, and the heat sink 19 On the other hand, an accommodating portion 22 for the ink ribbon cartridge 30 is disposed so as to straddle in the front-rear direction.

  In the ink ribbon cartridge 30 in the storage unit 22, the supply-side spool 50 of the ink ribbon sheet 23 is disposed on the rear side of the main body case 4, the winding-side spool 40 is on the front side of the main body case 4, and the supply-side spool It is arranged in a forward inclined shape (hip-up shape) so that the 50 side is a high position and the winding side spool 40 side is a low position. Accordingly, the lower portion of the storage portion 22 is located on the rear side of the lower surface of the main body case 4, and in combination with the forward inclined arrangement of the ink ribbon cartridge 30, a large space is provided on the rear surface of the lower surface of the main body case 4. It is formed. Therefore, a power supply circuit board 29a for operating the facsimile apparatus 1 and the like is disposed in this space, that is, below the storage unit 22. A control board 29b is disposed in front of the power circuit board 29a.

  The ink ribbon sheet 23 wound from the supply-side spool 50 to the front winding-side spool 40 passes through the top surface of the thermal head 20 and the spring plate-made ribbon peeling plate 26, and the lower circumference of the winding-side spool 40. It reaches the surface side. At this time, the ink surface of the ink ribbon sheet 23 is on the upper surface. The recording paper 3 that overlaps the upper surface (ink surface) of the ink ribbon sheet 23 is printed by the printing unit where the platen 17 and the thermal head 20 are superposed, and then is placed on the upper side of the ink ribbon cartridge 30 on the winding side spool 40 side. The sheet passes through the upper surface of the partition plate 27 having the function of the formed conveyance chute, and is discharged to the rear of the main body case 4 via the pair of discharge rollers 28. On the other hand, the ink ribbon sheet 23 is bent downward at the top surface of the ribbon peeling plate member 26, passes through the lower surface side of the partition plate, and is wound around the lower peripheral side of the winding side spool 40. .

2. Configuration of Ink Ribbon Cartridge As shown in FIGS. 2 to 7, the ink ribbon cartridge 30 includes a cartridge frame 31 having a rectangular frame shape (b-shaped) as a whole, and an ink ribbon sheet in a roll shape on the cartridge frame 31. A supply-side support for rotatably supporting a supply rotation shaft body 32 around which the roll 23 is wound and a take-up rotation shaft body 33 that winds the ink ribbon sheet 23 wound around the supply rotation shaft body 32 in a roll shape. It is the structure provided with the mechanism and the winding side support mechanism. The supply rotary shaft body 32 and the take-up rotary shaft body 33 are configured such that the ink ribbon sheet 23 is wound around the pipe bodies 32a and 33a as shown in FIG.

(1) Cartridge frame The cartridge frame 31 is a pair of a pair of bearing wall portions 34a and 34b whose one side faces each other and the upper surfaces of the pair of bearing wall portions 34a and 34b on the front and rear end sides. The connecting portions 35a and 35b are integrally formed of, for example, PS (polystyrene). Of these, as shown in FIGS. 4 and 8, bearing grooves 36 and 37 are formed in one of the bearing wall portions 34b on the front and rear end sides, respectively.

The bearing groove 36 is from a winding side spool 38 (corresponding to the “other winding side support member” of the present invention) attached to one end side (right side in FIG. 2) of the tube body 33a of the winding rotary shaft body 33. It plays the role which hold | maintains rotatably the axial part 38a which protrudes in an axial direction. On the other hand, the bearing groove 37 is pivoted from a supply-side spool 39 (corresponding to the “other supply-side support member” of the present invention) attached to one end surface (right side in FIG. 2) of the tube body 32a of the supply rotation shaft body 32. It plays the role which hold | maintains rotatably the axial part 39a which protrudes in the direction.
Here, each bearing groove 36, 37 is formed by cutting in the direction (substantially upward) facing the inner surface facing the outer peripheral surface of each rotary shaft 32, 33 in each coupling portion 35a, 35b. (See FIG. 4).

  In addition, a pair of gripping portions 80 and 80 project from the upper surface of the winding side coupling portion 35a. Each grip 80 is open on the rear side, and can be gripped by putting an operator's finger there (see FIG. 3). In addition, a plurality of grooves 80b are formed on the front surface of each gripping portion 80 in the left-right direction, and this plays a role as a slip stopper. In addition, a pair of ribs 81 and 81 are formed upright along the longitudinal direction of the winding side connecting portion 35a between the pair of gripping portions 80, and serve to reinforce the winding side connecting portion 35a. . On the other hand, a rectangular through hole 82 is formed in the longitudinally central portion of the supply-side connecting portion 35b on the rear end side where the supply-side spool 39 is provided. As shown in FIG. 1, this is for allowing the lower part of the arrangement part 83 for accommodating the spring 14 in the facsimile machine 1 to enter.

(2) Removable supply side and take-up side spools The take-up side spool 38 and the supply side spool 39 are each provided with the shaft portions 38a and 39a and disc-shaped flange portions 38b and 39b on the shaft portions 38a and 39a. The cylindrical spool portions 38c and 39c provided coaxially with each other are integrally formed. In the spool portions 38c and 39c, a plurality of ribs 38d and 39d extending along the axial direction are arranged side by side at equal intervals along the circumferential direction on the outer peripheral surface. The outer diameter formed by the ribs 38d and 39d is formed to be slightly larger than the inner diameter of the tube bodies 32a and 33a of the rotary shaft bodies 32 and 33. As a result, the spool portions 38c and 39c are press-fitted into the pipe bodies 32a and 33a so as to be rotated around the rotary shaft bodies 32 and 33. Further, the winding side spool 38 and the supply side spool 39 have the same shape and can be interchanged with each other.

(3) Non-detachable supply spool (with back tension mechanism)
A supply-side spool 50 that is inserted into the other end side (left side in FIG. 2 and right side in FIG. 8) of the tube body 32a of the supply rotating shaft 32 is located at a position facing the bearing groove 37 in the other bearing portion 34a. (Corresponding to “one supply side support member” of the present invention) is held rotatably. As shown in FIG. 9, the supply-side spool 50 includes a cylindrical spool portion 51 inserted into the other end side of the tube body 32 a of the supply rotation shaft body 32 and a compression spring accommodated in the spool portion 51. 52, a felt 53, and a rotating body 60. Among them, the spool portion 51 and the compression spring 52 are arranged with respect to the cartridge frame 31 from the inner surface side of the bearing wall portion 34a, and the felt 53 and the rotating body 60 are arranged with respect to the cartridge frame 31 from the outer surface side of the bearing wall portion 34a.

(A) Spool part and compression spring As shown in FIG. 10, the spool part 51 has an inner space partitioned by a partition wall 54 provided at a substantially central position in the axial direction. An insertion port 51b into which the distal end portion of the 60 insertion shaft portion 61 is inserted is formed through. The insertion opening 51b is provided with a pair of notches 54a and 54a so that a pair of locking projections 61a and 61a of an insertion shaft portion 61 of the rotating body 60 described later can be inserted in a predetermined direction. (See FIG. 11). The compression spring 52 is disposed between the partition wall 54 and the bearing wall portion 34a.

  Further, as shown in FIGS. 8 and 9, a pair of engaging protrusions 51 a and 51 a that engage with slits formed in the tube body 32 a of the supply rotating shaft 32 are formed on the outer peripheral surface of the spool portion 51. Projected. Thereby, the spool part 51 and the supply rotating shaft body 32 rotate integrally. Further, an engagement groove 51c that engages with a protruding end portion 52a that protrudes laterally from the end portion of the compression spring 52 is formed in the opening end peripheral portion of the spool portion 51 on the bearing wall portion 34a side. . As a result, the compression spring 52 rotates with the spool portion 51.

(B) Rotating body The rotating body 60 has a disk portion 62 whose one surface side 62a is opposed to the outer surface of the bearing wall portion 34a, an insertion shaft portion 61 protruding from the center position thereof, and the opposite side of the insertion shaft portion 61. The outer cylinder part 63 which protrudes into the structure is integrally formed. When the ink ribbon cartridge 30 is accommodated in the accommodating portion 22 of the facsimile apparatus 1, a shaft portion (not shown) protruding from the main body side frame (not shown) is fitted into and supported by the inner diameter portion of the outer cylinder portion 63. The The rotating body 60 is made of, for example, POM (polyacetal) which is a resin material harder than PS (polystyrene) used for the cartridge frame 31.

  The rotating body 60 has its insertion shaft portion 61 inserted through a bearing hole 31 a formed through the bearing wall portion 34 a, and further, its distal end portion is inserted into the insertion port 51 b of the spool portion 51. Further, a pair of locking projections 61a and 61a are provided on the outer peripheral surface of the distal end portion of the insertion shaft portion 61, and the insertion shaft portion 61 has an inner diameter D1 of the insertion port 51b as a whole as shown in FIG. It has a slightly smaller diameter, and is designed such that the distance D2 between both ends of the pair of locking projections 61a, 61a is larger than the inner diameter D1 of the insertion port 51b.

  With such a configuration, after the distal end portion of the insertion shaft portion 61 of the rotating body 60 is inserted into the insertion port 51b of the spool portion 51, the both are relatively rotated so that the locking projections 61a and 61a are connected to the insertion port 51b. The separation between the rotating body 60 and the spool portion 51 is regulated by engaging with the peripheral portion. At this time, the compression spring 52 is in a state where one end side where the protruding end portion 52 a is provided is in contact with the inner surface of the bearing wall portion 34 a and the other end side is in contact with the partition wall 54 while being compressed and deformed. The spool 51 receives a force in a direction away from the inner surface of the bearing wall 34 a by the repulsive force of the compression spring 52, and the disk portion 62 of the rotating body 60 locked to the spool 51 51 receives the bearing wall 34 a. It will be in the state pressed with respect to the outer surface. As a result, the supply-side spool 50 cannot be easily attached to and detached from the cartridge frame 31.

  In addition, as a structure which latches a rotary body and a spool part, you may show in FIG. The difference from the configuration shown in FIG. 10 described above lies in the locking structure between the rotating body and the spool portion, and the other points are the same as the configuration in FIG. Therefore, the same reference numerals as those in FIG. 10 are assigned and the redundant description is omitted, and only different points will be described next.

  In the configuration of FIG. 12, the rotating body 70 has a locking groove 71 a formed in the outer peripheral surface of the distal end portion of the insertion shaft portion 71 along the circumferential direction. It is a structure and the same code | symbol is attached | subjected. The insertion shaft 71 is formed with a tapered surface 71b having a tapered tip.

  On the other hand, as shown in FIG. 12, the spool portion 72 is partitioned by a partition wall 73 provided at an approximately central position in the axial direction, and the insertion shaft portion 71 of the rotating body 70 is inserted into the partition wall 73. The insertion port 73a to be formed is formed through. A cylindrical portion 74 that projects from the partition wall 73 toward the bearing wall 34 a is provided so as to communicate with the insertion port 73 a and cover the outer peripheral surface of the insertion shaft 71 of the rotating body 70. The compression spring 52 is disposed between the cylindrical portion 74 and the outer wall of the spool portion 72.

  In addition, a pair of flexure pieces 75 and 75 are provided at a position closer to the tip than the partition wall 73 in the spool portion 72 so as to sandwich the tip portion of the insertion shaft portion 71 of the rotating body 70. On both opposing surfaces of the pair of flexure pieces 75, 75 are formed locking projections 75a protruding in the opposing direction (inner side).

  With such a configuration, the distal end portion of the insertion shaft portion 71 of the rotating body 70 is passed through the insertion port 73a of the spool portion 72 and pushed in while bending and deforming the pair of bending pieces 75 and 75 sideways. As a result, the locking projections 75a of the bending pieces 75 and 75 are fitted into the locking grooves 71a of the insertion shaft portion 71, and the rotating body 70 and the spool portion 72 are locked (see FIG. 12).

  Next, as shown in FIG. 13, a plurality of protrusions 76 each having a tapered tip are formed upright at the portion of the outer surface of the bearing wall 34a facing the disk portion 62 of the rotating body 60. On the other hand, as shown in FIG. 14, a plurality of concentric annular grooves 77 centering on the insertion shaft portion 61 are formed on the opposing surface 62 a on the disk portion 62 side. Specifically, on the circular opposing surface 62a, the plurality of annular grooves 77 are formed only in a pair of semicircular regions sandwiching a predetermined linear region passing through the center thereof. The felt 53 has an annular shape corresponding to the shape of the disk portion 62, and is sandwiched between the outer surface of the bearing portion 34a and the disk portion 62 of the rotating body 60 while receiving the pressing force by the compression spring 52. It is. FIG. 15 shows a configuration in which an annular groove 77 similar to the rotary body 60 is formed in the rotary body 70 corresponding to the modification shown in FIG.

(C) Operation With the above configuration, when the take-up rotary shaft 33 is rotated by the driving force of the drive motor to start winding the ink ribbon sheet 23, the supply rotary shaft 32 is rotated accordingly. At the same time, the spool portion 51 and the rotating body 60 of the supply-side spool 50 also rotate integrally. At this time, the felt 53 receives a pressing force between the opposed surfaces of the outer surface of the bearing portion 34a and the disk portion 62 of the rotating body 60, and the surface of the felt 53 that comes into contact with the outer surface of the bearing portion 34a includes the bearing. A plurality of protrusions 76 formed on the outer surface of the portion 34a bite in and generate a strong frictional force. On the other hand, an annular groove 77 formed in the facing portion 62a is in contact with the surface of the felt 53 that contacts the facing portion 62a of the disk portion 62 of the rotating body 60, and is relatively weaker than the frictional force generated by the protruding portion 76. A frictional force is generated. Thus, the felt 53 is fixed to the outer surface of the cartridge frame 31 without being rotated with the rotating body 60. At the same time, the felt 53 and the facing portion 62a of the rotating body 60 are in smooth sliding contact with a constant frictional force, and a stable back tension (rotational resistance) is applied to the rotation of the supply rotating shaft body 32. it can.

(4) Non-detachable winding side spool The other bearing wall 34a of the cartridge frame 31 is opposed to the bearing groove 36 at the other end side of the tube 33a of the winding rotary shaft 33 (in FIG. 2). A winding side spool 40 (corresponding to “one winding side support member” of the present invention) inserted on the left side (right side in FIG. 8) is rotatably held. As shown in FIGS. 16 and 17, the take-up spool 40 is engaged with a slit (not shown) formed by cutting the tube body 33a on the outer peripheral surface of the distal end side inserted into the tube body 33a. An engaging portion 41 is provided to project, and the winding rotary shaft 33 and the winding side spool 40 are integrally rotated by this locking. Further, a drive motor (not shown) on the main body side when mounted on the main body of the facsimile machine 1 is disposed on the side of the shaft portion 42 that protrudes laterally through the bearing wall portion 34a of the take-up spool 40. A driving gear 43 that is screwed with an output gear (not shown) to which the driving force is transmitted is fitted. Hereinafter, the winding side spool 40 may be referred to as a “geared spool 40”.

  18 and 19, the geared spool 40 includes a gear member 90 (corresponding to the “second member” of the present invention) having the shaft portion 42 and the drive gear 43, and a winding. The spool member 93 (corresponding to the “first member” of the present invention) inserted into the tube 33a of the rotary shaft 33 is assembled.

(A) Spool member The spool member 93 has a cylindrical shape with one end opened, and the arm portion 91 of the gear member 90 is inserted from the open end. Further, an insertion hole 93a is formed on the outer peripheral surface on the front end side of the spool portion 93 so as to project the locking portion 41 of the arm portion 91 to the outside (see FIGS. 8 and 17). Further, a flange portion 95 protruding in a circular shape at the center of the rotation shaft is provided on the proximal end side (opposite side to the gear member 90) of the spool portion 93. Further, on the outer peripheral surface on the base end side with respect to the brim portion 95, the engaged portion that engages with a locking protrusion 92a (corresponding to the “engagement protrusion” of the present invention) of each of the bending portions 92, 92 described later. The joint holes 94 and 94 (corresponding to the “engagement recess” of the present invention) are respectively formed penetrating at symmetrical positions with respect to the rotation axis. As shown in FIG. 20, the inner circumferential surface of the spool member 93 has a tapered surface 93 b that is formed to have a large diameter along the direction facing the gear member 90 (opening direction). Yes.

(B) Gear Member On the other hand, the gear member 90 is provided with an arm portion 91 that protrudes on the side opposite to the shaft portion 42 (in the insertion direction into the spool member 93) and has the locking portion 41 formed at the tip. In addition, a pair of flexures 92 and 92 that are symmetrically arranged around the rotation axis of the gear member 90 are projected from the base end side of the arm 91. As shown in FIG. 20, the pair of flexures 92, 92 extends along the insertion direction from the drive gear 43 to the spool member 93, and has a shape in which the tip side is folded back to the side with respect to the rotation shaft. Make. Then, the distance between the outer surfaces of the folded portions 92b whose tip portions are directed in the direction opposite to the insertion direction (hereinafter referred to as “removal direction”) is the base on which the engaged hole 94 of the spool member 93 is formed. It is designed to be substantially the same shape as the inner peripheral surface of the end opening. That is, as shown in FIG. 20, with the gear member 90 and the spool member 93 assembled, the outer surface of each folded portion 92b is in contact with the inner peripheral surface of the spool member 93 facing it.

  Further, a locking projection 92a that engages with each of the engaged holes 94 is provided on the outer surface of the distal end portion in the separation direction of each folded portion 92b. As shown in FIG. 20, the locking projection 92a is a tapered surface 92d that is inclined so that its outer surface gradually increases in diameter as it goes in the direction of separation.

  Then, the arm portion 91 of the gear member 90 is inserted into the spool portion 93 through the bearing hole 31b formed through the bearing wall portion 34a. At this time, the pair of bending portions 92 and 92 are bent and deformed inward so as to be guided by the tapered surface 92d and the tapered surface 93b. Then, by further pressing the spool member 93 against the gear member 90, the locking projections 92a of the respective bending portions 92, 92 are engaged with the engaged holes 94, 94 of the spool portion 93, and the geared spool 40 is The cartridge frame 31 is mounted in an assembled state. Here, in this assembled state, a gap S is formed between the locking projection 92a and the engaged hole 94 (see FIG. 20).

Further, the tip end portion in the insertion direction of each folded portion 92b is a tapered surface 92c that approaches the rotation shaft toward the tip end, and the spool member 93 cooperates with the tapered surface 93b of the spool member 93. 93 can be easily inserted.
As shown in FIGS. 18 and 19, a pair of notches 93 c and 93 c are formed symmetrically with respect to the rotation axis on the opening end side of the spool member 93. Then, each of these notches 93c is fitted in the gear portion 43 of the gear member 90 with a connecting portion 43a continuous in the direction of the rotational axis, whereby the spool member 93 and the gear member 90 are positioned in the direction around the rotational axis. They started to follow each other.

  With such a configuration, the take-up rotary shaft 33 supported by the take-up spools 38 and 40 is rotated in the direction of the white arrow shown in FIG. It operates to wind up the wound ink ribbon sheet 23.

(C) Operation With the above-described configuration, for example, as shown in FIG. 21, when the spool member 93 is tilted by applying an external force (force directed downward in the drawing in the drawing) from the side, the spool member 93 is accompanied accordingly. The tip end portion (point A in the figure) of one bending portion 92 is pushed inward by the inner peripheral surface of the opening end. Then, the bending portion 92 moves in a direction in which the distal end portion A in the insertion direction bends inward, and the distal end portion (point B in the figure) of the folded-back portion 92b moves away from the rotation axis around the point A side. To do. That is, the locking projection 92a of the folded portion 92b moves so as to follow the inclination of the spool member 93, and the engaged state with the engaged hole 94 is maintained. Therefore, the spool member 93 and the gear member 90 are not easily detached.

  When the spool member 93 receives a stronger force and further tilts, the locking projection 92a is sandwiched between the inner wall C of the engaged hole 94 and the peripheral edge D of the bearing hole 31b. Thus, the locking projection 92a can be securely prevented from being detached from the engaged hole 94.

3. Advantages of the present embodiment (1) According to the present embodiment, the gear member 90 extends along the insertion direction from the drive gear 43 to the spool member 93, and its tip end is folded back to the side with respect to the rotation shaft. A pair of bent portions 92, 92 is provided. And the latching protrusion 92a formed in the outer surface of the removal | disconnection direction front-end | tip part of each folding | turning part 92b engages with the to-be-engaged hole 94 of the spool member 93. FIG. Accordingly, even when the external force is applied from the side of the spool member 93 in the assembled state, the bending portion 92 is deformed so that the folded portion 92b follows the inclination, so that the locking projection 92a and the engaged hole 94 are deformed. The engagement state is maintained and cannot be easily disengaged.

(2) Since the outer surface of the folded portion 92 contacts the inner wall of the spool member 93 in the assembled state, the spool member 93 and the gear member 90 can be positioned coaxially.
(3) Further, since the pair of flexures 92, 92 are symmetrically arranged with respect to the rotation axis of the spool member 93, the assembled state is more stable than the case where they are arranged asymmetrically.

(4) The bending portion 92 is deformed inwardly so as to be guided by the tapered surface 92d formed on the engaging protrusion 92a of the bending portion 92, returns in the assembled state, and engages with the locking protrusion 92a. The mating hole 94 is engaged. Therefore, the spool member 93 and the gear member 90 can be assembled smoothly.
(5) Moreover, it is the structure which has the clearance gap S between the taper surface 92d of the latching protrusion 92a, and the inner wall of the to-be-engaged hole 94, and makes it an assembly state. Therefore, it is possible to avoid a situation in which the engagement protrusion 92a is guided by the taper surface 92d so as to be detached from the engaged hole 94 and is easily released from engagement due to a slight axial deviation.

(6) Further, the pair of flexures 92 and 92 are bent and deformed inward so as to be reduced in diameter so as to be guided by the tapered surface 93b on the inner peripheral edge of the open end of the spool member 93, and returned to the assembled state. The locking projection 92a and the engaged hole 94 are engaged. Therefore, the spool member 93 and the gear member 90 can be assembled smoothly.
(7) Since the outer peripheral edge of the insertion end of the gear member 90 is a tapered surface 92c that gradually decreases in diameter in the insertion direction, the gear member 90 can be smoothly inserted into the spool member 93.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the locking protrusion 92 a is provided on the bending portion 92 side, and the locked hole 94 is provided on the inner peripheral surface of the spool member 93. Of course, the structure may be such that the engagement hole 94 is provided on the 92 side and the engagement protrusion 92 a is provided on the inner peripheral surface of the spool member 93.

  (2) In the said embodiment, although it was the structure which provided one pair of bending parts, not only this but 1 or 3 or more may be sufficient.

  (3) With respect to the above embodiment, the take-up spool 38 may have the same configuration as the spool 40 with gear.

(4) In the above-described embodiment, the cartridge frame has a rectangular frame shape. However, the present invention is not limited to this, and the cartridge frame may be a pair of bearing wall members that are not connected by the connecting portion.
(5) In the above embodiment, the felt 53 is used. However, the present invention is not limited to this, and an annular member made of cork or rubber (elastic material) may be used.

1 is an overall configuration diagram of a facsimile apparatus according to an embodiment of the present invention. Ink ribbon cartridge perspective view Left side view of ink ribbon cartridge Right side view of the ink ribbon cartridge Top view of ink ribbon cartridge Rear view of ink ribbon cartridge Front view of ink ribbon cartridge Perspective view of the ink ribbon cartridge as viewed from below Disassembled perspective view of supply side spool Cross section of supply side spool View of supply side spool viewed from the tip end of the insertion shaft Sectional view of a supply-side spool of a modification Enlarged view of the annular groove forming part of the cartridge frame The perspective view which showed the projection part on the opposing surface of a rotary body The perspective view which showed the annular groove formation part on the opposing surface of the rotary body of a modification Exploded perspective view of the spool portion on the take-up side (Part 1) Disassembled perspective view of the spool portion on the take-up side (Part 2) Perspective view showing structure of spool with gear (Part 1) Perspective view showing structure of spool with gear (Part 2) Sectional drawing which shows the assembly | attachment state of the spool with a gear seen from the lower part (the 1) Sectional drawing which shows the assembly | attachment state of the spool with a gear seen from the lower part (the 2) A perspective view showing the structure of a conventional geared spool

Explanation of symbols

1 ... Facsimile device (printing device)
DESCRIPTION OF SYMBOLS 23 ... Ink ribbon sheet 30 ... Ink ribbon cartridge 31 ... Cartridge frame 32 ... Supply rotation shaft body 33 ... Winding rotation shaft body 34a, 34b ... Bearing wall part 35a ... Winding side connection part 35b ... Supply side connection part 36, 37 ... Bearing grooves 38, 40 ... Winding side spool (winding side support member)
39, 50 ... Supply side spool (Supply side support member)
43 ... Drive gear 90 ... Gear member (second member)
92 ... Deflection part 92a ... Locking protrusion (locking convex part)
92b ... folded portion 92d ... taper surface (taper surface of locking projection)
92c ... Tapered surface (tapered surface of the insertion end of the second member)
93 ... Spool member (first member)
93b ... Taper surface (taper surface of the first member)
94 ... engaged hole (locking recess)
S ... Gap

Claims (7)

A cartridge frame;
A supply-side support mechanism that rotatably supports a supply rotating shaft body around which the ink ribbon sheet is wound, with respect to the cartridge frame;
Each end of the take-up rotary shaft body so as to rotate integrally with the take-up rotary shaft body that is arranged at a predetermined interval from the supply rotary shaft body and winds up the ink ribbon sheet wound around the supply rotary shaft body. And a pair of support members rotatably supported by the bearing portion of the cartridge frame, and an ink ribbon cartridge comprising:
At least one of the pair of support members is inserted into a recess in the end surface of the take-up rotary shaft body so that one end side thereof can rotate integrally with the take-up rotary shaft body. A cylindrical first member having the other end opened;
A second member disposed coaxially with the first member across the cartridge frame, having one end inserted into the opening end of the first member via the bearing and having a drive gear on the other end; Have
On the insertion end side of the second member, there is provided a flexibly deformable deflecting portion that extends in the direction of insertion into the first member and whose tip side is folded back to the side with respect to the same axis. And
One of the inner wall of the first member and the outer surface of the folded portion facing the inner wall is provided with an engaging convex portion, and the second member is in a normal position with respect to the first member on the other side. An ink ribbon cartridge, wherein an engagement concave portion that engages with the engagement convex portion in the assembled state is provided. The ink ribbon cartridge according to claim 1, wherein an outer surface of the folded portion abuts against an inner wall of the first member in the assembled state. The said bending part is a some bending part which makes a pair mutually, The bending parts which make a pair are symmetrically arrange | positioned centering | focusing on the central axis of the said 2nd member, The claim 1 or Claim 2 characterized by the above-mentioned. The ink ribbon cartridge described. The engagement convex portion is provided in the folded portion of the bending portion, and the engagement concave portion is provided in the inner wall of the first member,
4. The engagement projection according to claim 1, wherein the engagement protrusion has a tapered surface that gradually separates from the rotation shaft of the second member toward the drive gear. The ink ribbon cartridge described in 1. 5. The ink ribbon cartridge according to claim 4, wherein a gap is formed between the tapered surface of the engaging convex portion and a side wall of the engaging concave portion so as to be in the assembled state. The engagement convex portion is provided in the folded portion of the bending portion, and the engagement concave portion is provided in the inner wall of the first member,
6. The ink ribbon cartridge according to claim 1, wherein an inner peripheral edge of the opening end of the first member has a tapered surface that gradually increases in diameter in the opening direction. . The ink according to any one of claims 1 to 6, wherein an outer peripheral edge of the insertion end of the second member has a tapered surface that gradually decreases in diameter in the insertion direction. Ribbon cartridge.

Images