JP6150064B2 - Ink ribbon cassette - Google Patents

Description

The present invention belongs to the technical field of an ink ribbon cassette that contains a pancake-like ink ribbon that is used by being attached to a printer.

  As this type of conventional ink ribbon cassette, there is an ink ribbon cassette 100 as shown in FIG.

The ink ribbon cassette 100 includes a feeding core 3 in which an ink ribbon 5 is wound up in a pancake shape inside a hollow casing constituted by a cover 1 and a case 2, and an ink ribbon fed from the feeding core 3. A take-up core 4 for winding 5 is rotatably provided. In addition, the ink ribbon cassette 100 has a space 10 into which a print head (not shown) of the printer enters when the ink ribbon cassette 100 is mounted on the printer. At the time of printing with the printer, the ink ribbon 5 is drawn out from the feeding core 3 and pulled out to the space 10, and after the ink on the ink ribbon 5 is transferred to the transfer medium by the print head, the ink ribbon 5 is wound around the winding core 4. It is done. As such an ink ribbon cassette, an ink ribbon cassette as disclosed in Patent Document 1 is conventionally known.

  When such an ink ribbon cassette is set in a printer, there are the following two types of methods for holding the feeding core and the winding core rotatably. That is, the case where the feeding core and the winding core (hereinafter referred to as both cores) are held by the shaft of the printer, and the case where both cores are held by the holes of the case and the cover. FIG. 6 is a cross-sectional view of both core portions in a state where the ink ribbon cassette 100A holding both cores with the printer shaft is mounted on the printer, and the ink ribbon cassette 100B holding both cores in the holes of the case and the cover is mounted on the printer. FIG. 7 shows a cross-sectional view of both core portions in the state.

  As shown in FIG. 6, in the ink ribbon cassette 100A, the difference between the outer diameter of both cores and the hole diameter of the case and the cover is larger than the difference between the hole inner diameters of both cores and the outer diameter of the printer shaft. For this reason, even if both cores are rotated by the rotation of the printer shaft, the outer diameters of both cores rotate without contacting the case and the hole inner diameter of the cover. On the other hand, as shown in FIG. 7, in the ribbon cassette 100B, the printer shaft is provided only on the winding core side, and compared with the difference between the outer diameter of the printer shaft and the corresponding inner diameter of the winding core. The dimensional difference between the outer diameter of the winding core and the hole inner diameter of the case and the cover is small, and the outer diameter of the winding core rotates in contact with the hole inner diameter of the case and the cover. Further, in the ink ribbon cassette 100B, since there is no printer shaft on the feeding core side, the outer diameter of the feeding core rotates in contact with the inner diameter of the hole in the case and the cover.

In the present invention, as in the ink ribbon cassette 100A, the difference between the outer diameter of both cores and the outer diameter of the printer shaft is larger than the difference between the outer diameters of both cores and the case and the cover. The invention relates to an ink ribbon cassette that rotates even when rotated by a shaft without the outer diameter of both cores contacting the inner diameter of the hole of the case and the cover.

  In the ink ribbon cassette of the type in which the outer diameter of both cores contacts the hole inner diameter of the ink ribbon cassette and rotates when printing with a printer, such as the ink ribbon cassette 100B, The case and the cover receive the force generated by the rotation of the winding core obtained by winding the used ink ribbon in a pancake shape. Therefore, the strength and strength of the case and cover of the ink ribbon cassette are small, and if the ink ribbon cassette is deformed and distorted by the rotating force of both cores, both cores tilt and the ink ribbon is skewed, resulting in poor running of the ink ribbon. Sometimes. For this reason, in the ink ribbon cassette 100B, it is necessary to sufficiently increase the strength of the case and the cover so as not to be deformed by the rotating force of both cores.

In order to increase the strength of the case and cover of the ink ribbon cassette, it is necessary to increase the thickness of the walls that form the case and the cover so that the structure is sturdy, and there are many materials such as plastic used, which are expensive. It was.

On the other hand, in the ink ribbon cassette 100A, both cores are held by the printer shaft, and the outer diameter of both cores does not come into contact with the inner diameter of the hole of the case and the cover when printing with the printer. It does not act on the case and cover, that is, the housing. Therefore, even if the strength of the casing of the ink ribbon cassette is reduced, both cores are not tilted, and the ink ribbon is not skewed to cause running failure.

However, in the ink ribbon cassette 100A as described above, since the difference between the inner diameters of both cores and the outer diameter of the printer shaft is small, it is difficult to insert the printer shaft into both cores if the positions of both cores with respect to the printer shaft are shifted. . On the other hand, the difference between the outer diameters of both cores and the hole inner diameters of the case and the cover is large, and both cores move in the holes of the case and the cover. Therefore, the ink ribbon cassette 100A has a problem that it is difficult to mount the ink ribbon cassette to the printer.

JP 07-052507 A

  The present invention has been made in view of the problems of the conventional ink ribbon cassette as described above, and the problem to be solved by the present invention is that even if a casing with less material and less strength is used, The present invention provides an ink ribbon cassette that does not cause defective running of the ink ribbon and can be easily mounted on a printer.

According to a first aspect of the present invention, a feeding core in which at least an ink ribbon is wound up in a pancake shape and a winding core that winds up an ink ribbon fed out from the feeding core are provided inside the housing, and the feeding core And the take-up core is an ink ribbon cassette in which an outer diameter of at least one end portion is rotatably held in a hole provided in the housing, and the ink ribbon cassette includes the hole in the take-up core and the hole in the feeding core. The outer diameter of the end of the feeding core and the end of the feeding core are compared with the difference between the bore inner diameter of the feeding core and the outer diameter of the printer shaft inserted therein. The end of the winding core is larger than the difference between the inner diameter of the winding core and the outer diameter of the printer shaft inserted therein. The outer diameter of the part The difference between the outer diameter of the winding core end portion and the hole inner diameter of the casing is large, and the center of the hole inner diameter of the feeding core is the center of the casing that rotatably holds the feeding core. Alignment means for aligning with the center of the hole inner diameter, and alignment means for aligning the center of the hole inner diameter of the winding core with the center of the hole inner diameter of the casing that rotatably holds the winding core. Is an ink ribbon cassette.

According to a second aspect of the invention, the positioning means is a member that is a separate member from the casing and holds the feeding core and / or the winding core. The ink ribbon cassette according to the first aspect of the invention It is.

According to a third aspect of the present invention, the alignment means includes a plurality of elastically deformable elastic pieces that are provided in the casing and contact the feeding core, and a plurality of elastic pieces that are provided in the casing and contact the winding core. The ink ribbon cassette according to the first aspect of the present invention.

The fourth invention has a plurality of elastic pieces in which at least one of a plurality of elastically deformable elastic pieces in contact with the feeding core has a rotation preventing means for preventing rotation of the feeding core, and in contact with the winding core. At least one of the ink ribbon cassettes according to the third aspect of the present invention has a rotation preventing means for preventing the winding core from rotating.

  In the ink ribbon cassette of the present invention, compared with the difference between the hole inner diameter of the feeding core and the outer diameter of the printer shaft inserted therein, the outer diameter of the end of the feeding core and the hole inner diameter of the housing that rotatably holds the core Compared to the difference between the inner diameter of the winding core hole and the outer diameter of the printer shaft inserted into the winding core, the outer diameter of the end of the winding core and the inner diameter of the housing of the housing that holds it rotatably Therefore, even if the strength of the housing is small and easily deformed, both cores and the housing do not come into contact with each other when printing with a printer, and no running failure of the ink ribbon occurs. For this reason, a housing | casing with small intensity | strength can be used and the material used for a housing | casing can be decreased. In the ink ribbon cassette of the present invention, the alignment means for aligning the center of the hole inner diameter of the feeding core with the center of the hole inner diameter of the housing that rotatably holds the feeding core, and the center of the hole inner diameter of the winding core. Since there is a positioning means that matches the center of the hole inner diameter of the housing that holds the winding core rotatably, there is a large dimensional difference between the outer diameter of both cores and the hole inner diameter of the housing that holds it. However, the center of the hole inner diameter of both cores is held at a position that matches the center of the hole inner diameter of the housing. Therefore, since the distance between the center of the feeding core and the winding core is constant, the ink ribbon cassette can be easily attached to the printer.

It is a figure which shows the state which set the ink ribbon cassette A which concerns on 1st embodiment of this invention to the printer. It is a figure which shows the ink ribbon cassette A in which the alignment means which concerns on 1st embodiment of this invention is not mounted | worn, and the alignment means simple substance. It is a figure which shows the state which set the ink ribbon cassette B which concerns on 2nd embodiment of this invention to the printer. It is a figure which shows the positional relationship of the movement hole of the housing | casing 6 of the ink ribbon cassette B which concerns on 2nd embodiment of this invention, and the pin of a printer. It is a figure which shows the conventional ink ribbon cassette. Of the conventional ink ribbon cassette 100, the ink ribbon cassette 100A holds both cores with a printer shaft. Of the conventional ink ribbon cassette 100, the ink ribbon cassette 100B holds both cores with holes in the case and cover of the ink ribbon cassette.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments. FIG. 1 is a plan view of a state where the ink ribbon cassette A according to the first embodiment of the present invention is set in a printer, a cross section MM of the plan view, and a cross section NN of the cross section MM. FIG. 2 is a diagram showing the ink ribbon cassette A not equipped with the alignment means and the alignment means alone.

  The ink ribbon cassette A of FIG. 1 includes a feeding core 3 in which an ink ribbon 5 is wound in a pancake shape around a casing 6 that is integrally formed, and a winding core 4 that winds up the ink ribbon 5 that has been fed out from the feeding core 3. It is provided rotatably. Further, at one end of the feeding core 3 and the winding core 4 on the side where the printer shaft is inserted, the center of the inner diameter of the hole of the feeding core is set to the center of the inner diameter of the hole of the housing that rotatably holds the feeding core. The aligning means 7 for aligning and the aligning means 8 for aligning the center of the hole inner diameter of the winding core 4 with the center of the hole inner diameter of the housing 6 that rotatably holds the winding core 4 are attached.

Similar to the ink ribbon cassette 100A shown in FIG. 6, the ink ribbon cassette A is a type of ink ribbon cassette in which both cores are held by the shaft of the printer when mounted on the printer. That is, the dimensional difference between the inner diameters of both cores and the outer diameter of the printer shaft inserted therein is larger than the dimensional difference between the outer diameters of both cores and the hole diameter of the housing 6 that rotatably holds the outer diameter. When the ink ribbon cassette is small and is mounted on a printer for printing, the outer diameter of both cores does not come into contact with the inner diameter of the hole of the housing 6 and is a rotating ink ribbon cassette.

The housing 6 is composed of only two holding plates 6A for holding both ends of the feeding core 3 and the take-up core 4 and a minimum side plate 6B connecting the two, and the conventional ink ribbon cassette shown in FIG. Compared to 100, it is made with less material. For this reason, the ink ribbon cassette A has a structure that is easily deformed by an external force and has a lower strength than the ink ribbon cassette 100.

  The feeding core 3 and the take-up core 4 are provided on the body portions 3A and 4A around which the ink ribbon is wound, the attachment portions 3B and 4B which are provided at both ends thereof and have a smaller outer diameter than the body portions 3A and 4A and the attachment portions 3B and 4B. The retaining portion 3C, 4C has a large outer diameter. Inside the feeding core 3 and the take-up core 4, there are provided a body part 3B and through holes 3D and 4D concentric with the body part 4B, respectively, and part of the through holes 3D and 4D are engaged with the shaft of the printer. Protrusions 3E and 4E are provided at equiangular intervals.

The holding plates 6A on both sides of the housing 6 are provided with holes 63C and 64C for holding the attachment portions 3B and 4B of the feeding core 3 and the winding core 4, respectively. Openings 63D and 64D for inserting the attachment portions 3B and 4B from the side are provided, and when the feeding core 3 and the take-up core 4 are inserted from the openings, the openings 63D and 64D are opened and both the cores 3 and 4 are opened. Can be mounted in the holes 63C and 64C. When both the cores 3 and 4 are mounted in the holes 63C and 64C, the openings 63D and 64D are closed by the elastic force, and the cores 3 and 4 are held so as not to come off.

To the housing 6, a feeding core 3 in which an ink ribbon is wound in a pancake shape, and an outer peripheral end of the ink ribbon pancake are attached to a winding core 4, and a pancake in which both cores 3 and 4 are set as a set. Install the set. First, the mounting portion 3B of the feeding core 3 is inserted from the side of the opening 63D and mounted in the hole 63C, and then the winding core is passed from the side of the opening 64D through the outside of the side plate 6B. Insert and install in hole 64C. On the side plate 6B side of the housing 6, there is formed a space 10 into which a print head (not shown) of the printer enters when the ink ribbon cassette A is mounted on the printer. Accordingly, by setting the ink ribbon so that it passes outside the side plate 6B, when the ink ribbon cassette A is set in the printer, the ink ribbon passes through the front surface of the print head of the printer.

Two shafts are provided in a portion where the ink ribbon cassette of the printer is mounted. One of them is a feeding shaft 21 that is inserted into the through hole 3 </ b> D of the feeding core 3. The outer diameter of the feeding shaft 21 is smaller than the inner diameter of the through hole 3D, but the difference in diameter is preferably 0.1 mm or more and 0.3 mm or less, and more preferably 0.1 mm or more and 0.2 mm or less. Concave portions 21B for engaging with convex portions 3E provided in a part of the through hole 3D of the feeding core 3 are provided at equal angular intervals in a part of the outer diameter of the feeding shaft 21. When the ink ribbon cassette A is attached to the printer, the concave portion 21B and the convex portion 3E are engaged, so that when the ink ribbon 5 is fed from the feeding core 3, the braking force applied to the feeding shaft 21 is transmitted to the feeding core 3. Then, tension is applied to the ink ribbon 5.

The other shaft is a winding shaft 22 that is inserted into the through hole 4 </ b> D of the winding core 4. The outer diameter of the winding shaft 22 is smaller than the inner diameter of the through hole 4D, but the difference in diameter is preferably 0.1 mm or more and 0.3 mm or less, and more preferably 0.1 mm or more and 0.2 mm or less. In part of the outer diameter of the winding shaft 22, recesses 22 </ b> B for engaging with the protrusions 4 </ b> E provided in a part of the through hole 4 </ b> D of the winding core 4 are provided at equiangular intervals. When the ink ribbon cassette A is mounted on the printer, the concave portion 22B and the convex portion 4E are engaged. Therefore, when the winding shaft 22 rotates, the winding core 4 also rotates, and the ink ribbon 5 fed from the feeding core 3 is taken up. It is wound around the core 4.

  The outer diameter of the attachment portion 3B of the feeding core 3 is smaller than the inner diameter of the hole 63C of the housing 6 that holds it, and the difference is preferably 0.4 mm or more and 1.5 mm or less, and 0.4 mm or more and 1.2 mm. The following is more preferable. The relationship between the mounting portion 4B of the winding core 4 and the 64C that rotatably holds the same is the same.

  In this way, the difference between the core outer diameter held in the hole of the housing 6 and the hole inner diameter of the housing 6 is larger than the difference between the shaft outer diameter of the printer inserted into the core hole and the core inner diameter of the core. When printing with a printer, the outer diameter of the core does not contact the inner diameter of the hole in the housing. For this reason, as described above, the housing 6 is made of a material less than that of the conventional ink ribbon cassette 100, and even if the strength is low, the running failure of the ink ribbon such as skew does not occur.

  However, in the ink ribbon cassette A, the difference between the outer shaft diameter of the printer inserted into both cores and the inner diameter of both cores is reduced, so if the positions of both cores deviate from the printer shaft, the printer shaft to both cores Insertion becomes difficult. Further, since the difference between the outer diameter of the core held in the hole of the casing 6 and the inner diameter of the hole of the casing 6 is increased, the core may move in the hole of the casing 6 and shift from a predetermined position. Therefore, in the ink ribbon cassette A, it may be difficult to attach the ink ribbon cassette to the printer.

In order to facilitate mounting of the ink ribbon cassette to the printer, in the ink ribbon cassette A, the center of the inner diameter of the hole of the feeding core is fed to the end of the feeding core 3 and the winding core 4 on the side where the printer shaft is inserted. Positioning means 7 for matching the center of the inner diameter of the hole in the casing holding the core, and positioning means 8 for aligning the center of the hole inner diameter of the winding core with the center of the inner diameter of the hole in the casing holding the winding core And are attached. When the alignment means 7 and 8 are attached, the centers of the inner diameters of the through-holes 3D and 4D of the feeding core 3 and the winding core 4 are adjusted to a predetermined position, so that the ink ribbon cassette A can be easily attached to the printer. . The positioning means 7 and 8 can be removed from the ink ribbon cassette A in a state where the ink ribbon cassette A is mounted on the printer. When the ink ribbon cassette A is printed by a printer with the positioning means 7 and 8 attached, the feeding core 3 comes into contact with the positioning means 7 and the winding core 4 comes into contact with the positioning means 8, and the feeding core 3 and the winding core are taken up. Since the rotation resistance of the core 4 becomes resistance, it is necessary to remove the alignment means 7 and the alignment means 8 from the ink ribbon cassette A after being mounted on the printer.

  When the alignment means 7 is attached to the ink ribbon cassette A, the hole 71 of the alignment means 7 can hold the attachment portion 3B of the feeding core 3 without rattling and can be fixed at a predetermined position of the housing 6. When the alignment means 7 is attached to the ink ribbon cassette A, the center of the through hole 3D of the feeding core 3 is fixed at a predetermined position of the housing 6. This is the same when the positioning means 8 is mounted on the ink ribbon cassette A. When the positioning means 8 is mounted, the center of the through hole 4D of the winding core 4 is fixed at a predetermined position of the housing 6.

FIG. 2 shows the ink ribbon cassette A not equipped with the alignment means and the alignment means alone. The alignment means 7 has a U-shape with one long side, and a hole 71 for holding the attachment portion 3B of the feeding core 3 is provided on a surface forming one side of the longer U-shape. The hole 71 is provided with an opening 72 for lateral insertion into the attachment portion 3B of the feeding core 3, and elastically deformable holding portions 73 are provided on both sides of the opening 72, and the opening to the feeding core 3 is provided. When inserted from the side, the holding portion 73 is opened so that the feeding core 3 is mounted in the hole 71. The inner diameter of the hole 71 is designed to be substantially equal to the outer diameter of the mounting portion 3B. The inner diameter of the hole 71 is preferably slightly larger than the outer diameter of the attachment portion 3B, and the difference in diameter is preferably 0.1 mm or less, more preferably 0.05 mm or less. Since the difference between the inner diameter of the hole 71 and the outer diameter of the mounting portion 3B is small, the hole 71 can hold the mounting portion 3B without rattling.

  The holding plate 6 </ b> A of the housing 6 is provided with a rail portion 63 </ b> F in which a part of the end surface is recessed in order to mount the alignment means 7. As shown in FIG. 1, when the positioning means 7 is mounted from the end of the holding plate 6A along the rail portion 63F, the positioning means 7 holds the attachment portion 3B of the feeding core 3 in the hole 71 and feeds it. The core 3 is aligned with a predetermined position.

The width X of the rail portion 63F is designed to be slightly larger than the width Y of the alignment means 7, and the dimensional difference is preferably 0.2 mm or less, more preferably 0.1 mm or less.

Engaging concave portions 63G are provided on both side walls of the concave portion of the rail portion 63F. Engaging protrusions 74 are provided on both side portions of the portion that slides with the rail portion 63F of the alignment means 7. When the alignment means 7 is inserted into the rail portion 63F, the engagement protrusion 74 engages with the engagement recess 63G, and the alignment means 7 is fixed to the holding plate 6A of the housing 6.

  In this way, when the alignment means 7 is mounted on the housing 6, the movement of the alignment means 7 is restricted by the side walls of the recess of the rail 63F in the width direction of the rail 63F, and the longitudinal direction of the rail 63F. As for, the movement of the alignment means 7 is restricted by the engagement of the engagement recess 63G and the engagement protrusion 74. Therefore, the alignment means 7 is fixed at a predetermined position of the housing 6. Further, since the hole 71 of the positioning means 7 holds the mounting portion 3B of the feeding core 3 without rattling, the center of the through hole 3D of the feeding core 3 when the positioning means 7 is mounted on the ink ribbon cassette A. Is fixed to the center of the hole 63 </ b> C of the housing 6.

The same applies to the relationship between the alignment means 8, the winding core 4 and the casing 6. By setting the alignment means 8 to the casing 6, the hole 81 of the alignment means 8 can be wound without rattling. The center of the through hole 4D of the winding core 4 is fixed to the center of the hole 64C of the housing 6 while holding the mounting portion 4B of the core 4.

FIG. 3 is a plan view of the state in which the ink ribbon cassette B according to the second embodiment of the present invention is set in the printer, a cross section MM of the plan view, and a cross section NN of the cross section MM. FIG. 4 is a view showing the positional relationship between the movement holes 63K and 64K of the casing 6 of the ink ribbon cassette B and the pins 25 of the printer. The ink ribbon cassette B is not provided with a positioning means that is a separate member from the housing 6, and is used to prevent rotation over the entire circumference of the outer peripheral portions of the feeding core 3 and the take-up core 4 and the retaining portions 3C, 4C. The triangular teeth 3F and 4F are provided, and the elastic pieces 63H and 64H that press the outer periphery of the rotation preventing portions 3C and 4C are provided on the holding plate 6A on the side where the printer shaft of the housing 6 is inserted. Except for this, it is the same as the ink ribbon cassette A.

As shown in FIG. 3, around the holes 63C and 64C of the holding plate 6A of the casing 6 of the ink ribbon cassette B, elastic pieces 63H and 64H are provided at three positions at equal angular intervals.

  The elastic pieces 63H and 64H are each provided with a contact protrusion protruding toward the center of the hole 63C or 64C at the tip thereof, and the feeding core 3 and the take-up core 4 are attached to the holes 63C and 64C, respectively. Then, the contact protrusions are in contact with the outer periphery of the retaining portion 3C of the feeding core 3 and the outer periphery of the retaining portion 4C of the winding core, respectively, so that the feeding core 3 and the winding core 4 are brought into predetermined positions on the housing 6. Fix it.

By fixing the feeding core 3 and the winding core 4 at predetermined positions of the housing 6, the center of the through hole 3 </ b> D of the feeding core 3 is fixed to the center of the hole 63 </ b> C of the housing 6. The center of the hole 4D is fixed to the center of the hole 64C of the housing 6. As a result, the ink ribbon cassette B can be easily attached to the printer as in the case of the ink ribbon cassette A.

One of the contact protrusions around each of the holes 63C and 64C is provided on a line passing through the centers of the holes 63C and 64C in parallel with the longitudinal direction of the openings 63D and 64D, respectively. The contact protrusions 63J and 64J provided on this line have a triangular shape that engages with the triangular teeth 3F and 4F on the outer peripheral portions of the retaining portions 3C and 4C. The feeding core 3 and the winding core 4 are When mounted on the housing 6, the triangular shapes of the contact protrusions 63J and 64J engage with the triangular teeth 3F and 4F so that the feeding core 3 and the winding core 4 do not rotate.

The two contact protrusions 63L and 64L other than the contact protrusions on the parallel lines are curved and do not engage with the triangular teeth 3F and 4F, so that the core 3 and the winding core 3 are wound from the openings 63D and 64D. When the take-up core 4 is inserted, the two curved contact protrusions 63L and 64L move along the shapes of the retaining portions 3C and 4C. Even when the feeding core 3 and the winding core 4 are inserted up to the holes 63C and 64C, the contact protrusions 63L and 64L are kept in contact with the outer periphery of the retaining members 3C and 4C by the elastic force of the elastic pieces 63H and 64H. .

  The elastic pieces 63H and 64H are provided with moving holes 63K and 64K, respectively. As shown in FIG. 4, the moving holes 63K and 64K are round holes, and are provided with an inclination that decreases in diameter from the entrance side toward the back. Further, when the ink ribbon cassette B is mounted on the printer, pins 25 are provided which are inserted into the movement holes 63K and 64K. When the pin 25 is inserted into the movement holes 63K and 64K, the outer diameter of the pin 25 is inserted while being in contact with the inclination of the movement holes 63K and 64K. When the outer diameter of the pin 25 is inserted in contact with the inclination of the moving holes 63K and 64K, the moving holes 63K and 64K move in a predetermined direction. In the printer in which the ink ribbon cassette B is mounted, the pins 25 are provided so that the movement holes 63K and 64K move away from the centers of the holes 63C and 64C of the housing 6, respectively. As a result, when the ink ribbon B is mounted on the printer, the elastic pieces 63H and 64H are elastically deformed, and the contact protrusions 63J and 63L and 64J and 64L move away from the centers of the holes 63C and 64C, respectively, and come off. The stoppers 3C and 4C are not in contact with the outer diameter.

The distances by which the contact protrusions 63J and 63L and 64J and 64L move by the printer pins 25 are at least larger than the difference between the diameters of the holes 63C and 64C and the diameters of the mounting portions 3B and 4B. By setting the moving distance in this way, the contact protrusions 63J, 63L, 64J, and 64L do not come into contact with the retaining portions 3C and 4C after the ink ribbon cassette B is mounted on the printer. There is no resistance to rotation of the winding core 4.

1: Cover 2: Case 21: Feeding shaft 21B (of the printer): Concave portion 22 of (printer feeding shaft 21): Winding shaft 22B (of printer): Convex portion 25 of (printing shaft 22 of printer): ( Pin 3 of printer: Feeding core 3A: Body portion 3B: Mounting portion 3C: Retaining portion 3D: Through hole 3E: Protruding portion 3F: Triangular tooth 4: Winding core 4A: Body portion 4B: Mounting portion 4C: Retaining portion Portion 4D: Through-hole 4E: Protruding portion 4F: Triangular tooth 5: Ink ribbon 6: Housing 6A: Holding plate 6B: Side plate 63C, 64C: Hole 63D, 64D: Opening 63F, 64F: Rail portion 63G, 64G: Engagement Joint recess 63H, 64H: elastic piece 63J, 64J: contact protrusion (triangular shape)
63K, 64K: moving holes 63L, 64L: contact protrusions (curved)
7, 8: Positioning means 71, 81: Hole 72, 82: Opening portion 73, 83: Holding portion 74, 84: Engagement protrusion 10: Space 100, 100A, 100B, A, (printer print head enters) B Ink ribbon cassette

Claims (4)

  A feeding core in which at least an ink ribbon is wound up in a pancake shape and a winding core that winds up the ink ribbon fed out from the feeding core are provided inside the housing. The feeding core and the winding core Is an ink ribbon cassette in which the outer diameter of at least one end portion is rotatably held in a hole provided in the housing, and the ink ribbon cassette is inserted into the hole of the winding core and the hole of the feeding core, respectively. Used in printers with shafts, rotating the outer diameter of the feeding core end and the outer diameter of the feeding core end compared to the difference between the bore inner diameter of the feeding core and the outer diameter of the printer shaft inserted therein The difference between the hole inner diameter of the housing that can be held is large, and compared with the difference between the hole inner diameter of the winding core and the outer diameter of the printer shaft inserted therein, the outer diameter of the end of the winding core The winding core The difference between the outer diameter of the housing and the bore inner diameter of the housing is large, and the center of the bore inner diameter of the feeding core is the center of the bore inner diameter of the housing holding the feeding core rotatably. An ink ribbon cover comprising alignment means for aligning, and aligning means for aligning a center of a hole inner diameter of the winding core with a center of a hole inner diameter of the casing that rotatably holds the winding core. set. 2. The ink ribbon cassette according to claim 1, wherein the alignment unit is a member separate from the casing and is a member that holds the feeding core and / or the winding core. The alignment means includes a plurality of elastically deformable elastic pieces provided in the casing and in contact with the feeding core, and a plurality of elastic pieces provided in the casing and in contact with the winding core. The ink ribbon cassette according to claim 1. At least one of a plurality of elastically deformable elastic pieces in contact with the feeding core has rotation preventing means for preventing rotation of the feeding core, and at least one of the plurality of elastic pieces in contact with the winding core. 4. The ink ribbon cassette according to claim 3, wherein the hook has a rotation preventing means for preventing the winding core from rotating.

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