JP2013014078A - Printing device with back tension mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimize and stabilize a back tension force and to reduce the size of a printing device.SOLUTION: The printing device includes: a retention means 502 that retaining an ink ribbon cassette at a predetermined position that loaded in the device; a back tension generating member 402 that is disposed at a position that is located at a deeper loading direction of the ink ribbon cassette and corresponds to the ink ribbon bobbin 110; a pressor 403 that is elastically contacted with the back tension generating member 402 and rotatably mounted around a rotary shaft 410; and a bush 404 that is integrally rotatable in the same axis as the pressor 403, pivoted to be relatively movable in an axial direction of the rotary shaft 410 and is engaged with the ink ribbon bobbin 110.

Description

  The present invention relates to a printing apparatus having a back tension mechanism that applies a back tension by engaging with a supply-side bobbin in which an ink ribbon is wound in a roll shape.

  In recent years, various printing apparatuses that perform sublimation printing of an ink ribbon on a print recording medium using a thermal head have been proposed. Many of the sublimation printing apparatuses use a supply-side bobbin in which one end of an ink ribbon is wound in a roll shape and a take-up bobbin in which the other end is wound. While winding up the bobbin on the take-up side and applying back tension to the supply-side bobbin, the ribbon is brought into close contact with the print recording medium with a thermal head and heated for printing. The back tension applied to the ribbon supply side bobbin serves as a brake so that the ink ribbon is not pulled out excessively by the drawing side pulling force. At the same time, the ink ribbon is pulled on both the ribbon take-up side and the ribbon supply side to prevent the ink ribbon from wrinkling.

Japanese Patent Application Laid-Open No. 09-174773

  As a configuration for applying the back tension to the ribbon supply-side bobbin, for example, one disclosed in Patent Document 1 is disclosed. In Patent Document 1, in order to generate a back tension, a felt is sandwiched between a pressure member biased by a gear and a spring to form one back tension unit. A supply side bobbin engaging portion is provided at one end of the back tension unit, and a back tension unit biasing spring for biasing the entire unit in the direction of the supply side bobbin is provided between the back tension unit and the chassis of the printing apparatus. .

The back tension unit urging spring is in the state where the supply side bobbin engagement portion is retracted, even if the phase of the loaded ribbon supply side bobbin and the supply side bobbin engagement portion is out of phase, The supply side bobbin engaging portion is biased in the direction of the ribbon supply side bobbin.
Furthermore, one that holds the felt is a gear, and the ink ribbon is driven in the rewinding direction by applying a power interlocking with the rising force of the thermal head to the gear. When the thermal head descends, the one-way mechanism works and the head descending force does not work. However, the configuration of Patent Document 1 has the following problems.

  The first problem is that since the back tension unit itself is retracted in the ribbon cassette loading direction, the internal space of the printing apparatus must be vacated for retraction, resulting in an increase in the size of the printing apparatus. When the back tension is generated using the felt, the friction force generated between the felt and the pressure member is the back tension force. Since friction force is generated with a relatively large back tension force, it is necessary to make the friction area of the felt appropriate in order to reduce variations in the back tension force. For this reason, when a relatively large back tension force is required, increasing the applied pressure while keeping a small felt friction area results in a large variation in the friction force. In the case of the configuration of Patent Document 1, if the back tension force is further increased while reducing variations in the back tension force, the felt friction area is ensured by increasing the felt outer diameter. As a result, the outer diameter of the gear or pressure member holding the felt increases, and the outer diameter of the back tension unit itself increases. The enlarged outer diameter portion is retracted, and the internal space of the printing apparatus must be widely opened for retracting.

  The second problem is that since one of the felt clamping members that generate the back tension force is a gear, an accurate back tension force cannot be generated unless the gear is completely stopped. In Patent Document 1, a gear, which is one of felt clamping members that generates a back tension force in order to perform a ribbon rewinding operation, is rewound in conjunction with the head lifting operation. Since a plurality of gears and a one-way mechanism are provided, the backlash of the gear is completely eliminated, and until the one-way mechanism is loosened, the felt one-side holding becomes unstable, and the generated back tension force varies. In particular, a back tension variation is likely to occur immediately after head down, and problems such as unstable printing immediately after head down occur.

  An object of the present invention is to achieve an appropriate and stable back tension force and to make the apparatus compact.

In order to achieve the above object, the present invention has the following configuration.
That is, the printing apparatus having the back tension mechanism of the present invention is a printing apparatus having a back tension mechanism that engages with the ink ribbon bobbin to apply the back tension, and the ink ribbon cassette loaded in the apparatus is set in a predetermined manner. Holding means for holding in position, a back tension generating member disposed at a position corresponding to the ink ribbon bobbin on the back side in the loading direction of the ink ribbon cassette, elastically contacting the back tension generating member, A presser rotatably mounted around the bush, and a bush that is coaxially rotatable with respect to the presser and is rotatably supported in the axial direction of the rotary shaft and engages with the ink ribbon bobbin. When the holding by the holding means is released, the ink ribbon cassette is detached from the apparatus. Characterized in that so as to be energized through said bushings so that.

  In the printing apparatus having the back tension mechanism of the present invention, the first elastic member for biasing the presser so as to elastically contact the back tension generating member and the first elastic member are provided independently. And a second elastic member for urging the bush so as to engage with the ink ribbon bobbin.

  In the printing apparatus including the back tension mechanism of the present invention, the ink ribbon cassette holds the ink ribbon bobbin around which the ink sheet is wound in a rotatable manner, and moves the ink ribbon bobbin in the engaging direction. It has a bobbin urging means for urging, and an engaging portion between the ink ribbon bobbin and the cassette cover.

  In the printing apparatus having the back tension mechanism according to the present invention, the ink ribbon bobbin and the bush are disengaged at the first position in the apparatus of the ink ribbon cassette, and the ink ribbon bobbin and the cassette. The ink ribbon bobbin engages with the engagement portion to restrict the rotation of the ink ribbon bobbin, and the ink ribbon bobbin engages with the bush at the second position in the apparatus of the ink ribbon cassette. The cassette cover is disengaged and the ink ribbon bobbin is rotatable.

  In the printing apparatus provided with the back tension mechanism of the present invention, the presser and the bush are engaged with each other through protrusions protruding in a comb-like shape in the axial direction.

  In the printing apparatus including the back tension mechanism of the present invention, the first elastic member and the second elastic member are arranged in series along the rotation axis of the presser.

  In the printing apparatus having the back tension mechanism of the present invention, the back tension generating member is fixed to at least one of the fixing surface on the back side in the loading direction of the ink ribbon cassette and the presser. .

  Further, in the printing apparatus having the back tension mechanism of the present invention, the urging force is applied in the order of the first elastic member, the second elastic member, and the bobbin urging means in a state where the ink ribbon cassette is held by the holding means. It is characterized by being set large.

  In the printing apparatus according to the present invention, it is possible to generate a relatively large back tension force using a relatively small apparatus space or space while reducing variations. Further, since the structure is simple, the assemblability is good and the cost is low. Furthermore, the pushing force for taking out the ribbon cassette can also be used as the phase matching spring of the ink ribbon supply side bobbin, and the dedicated spring force can be set, so that it is possible to prevent the ink ribbon cassette from jumping out excessively.

1 is a schematic view of a sublimation printing apparatus according to an embodiment of the present invention. It is a figure which shows the structural example of the ink sheet which concerns on this invention. It is a perspective view of an ink sheet cassette used in an embodiment of the present invention. It is a perspective view of a chassis and back tension generating means of a printing apparatus in an embodiment of the present invention. It is sectional drawing showing the loading state to the printing apparatus of the ink sheet cassette in embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the present invention according to the claims, and all combinations of features described in the present embodiments are essential to the solution means of the present invention. Not exclusively.

  FIG. 1 is a schematic diagram of a sublimation printing apparatus according to the present embodiment. The paper (recording medium) 112 is pulled out from the roll paper 101 wound in a roll shape by the rotation of the paper feed roller 102, and the leading end of the paper 112 is sent to the grip roller 103 whose rotation is controlled by a stepping motor. A pinch roller 106 is disposed so as to sandwich the paper 112 on the opposite side of the grip roller 103, and the paper 112 is conveyed to the paper detection sensor 114 by the rotation of the grip roller 103. A photo reflector or the like is used as the paper detection sensor 114. After the leading edge of the paper 112 is detected by the paper detection sensor 114, the conveyance position of the paper 112 is controlled in an open loop.

  By further rotation of the grip roller 103, the paper 112 is conveyed to the platen roller 104 and the paper discharge roller 107. A thermal head 109 is disposed on the opposite side of the platen roller 104, and the ink sheet 105 passes between the thermal head 109 and the paper 112. The ink sheet 105 constitutes an ink ribbon.

  FIG. 2 is a configuration example of an ink sheet. The ink sheet 105 includes a yellow (Y) color 201, a magenta (M) color 202, and a cyan (C) color 203 sublimation dye ink portion and a hot-melt ink OP layer 204. Each set of the sublimation-type ink portion and the hot-melt ink portion arranged in the surface order is periodically arranged. In addition, a marker 205 for detecting the cueing of the ink sheet 105 is arranged between each sublimation ink portion and the sublimation ink portion and the hot melt ink portion, and the marker 205 is detected by the marker detection sensor 113. Done. A photo reflector or the like is used as the marker detection sensor 113, and the ink detection sheet 105 is cued by the marker detection sensor 113 before or after printing of each color.

  The ink sheet 105 is supplied from an ink sheet supply-side bobbin 110 (an ink ribbon bobbin according to the present invention), passes between the thermal head 109 and the paper 112, and is wound up by a rotational drive of a motor. It is wound around the side bobbin 108. The thermal head 109 is a line-type thermal head in which a plurality of heating elements are arranged by an amount corresponding to at least the width of the paper 112 (main scanning direction). The paper 112 is in the A direction (secondary) perpendicular to the thermal head 109. The image is transferred (recorded) in the scanning direction.

  When the image is transferred to the paper 112, first, the thermal head 109 and the platen roller 104 are left separated. Then, the ink sheet winding side bobbin 108 is wound up by the ink ribbon winding means (not shown) until the ink sheet cueing detection marker 205 is detected. At this time, the back tension is applied to the ink sheet supply side bobbin 110 in a direction that prevents the ink sheet 105 from being pulled out by a back tension generating means described later. The back tension prevents the ink sheet 105 from being pulled out excessively due to the inertia force of the ink sheet winding drive and prevents wrinkles from occurring on the ink sheet 105. Furthermore, the ink sheet 105 is prevented from being inadvertently pulled out from the ink sheet supply side bobbin 110 by the frictional force with the paper during paper conveyance.

  When the cueing of the ink sheet 105 is completed, the thermal head 109 and the platen roller 104 are in a pressure-bonded state, and the ink sheet 105 is in contact with the heating element of the thermal head 109 and the paper 112. Roll paper driving means (not shown) starts paper rewind driving, and ink sheet winding is started by the ink sheet winding means. In this state, the heat generator of the thermal head 109 is driven to generate heat according to the image data by a main controller (not shown). Due to the heat generated by the heating element, the sublimable dye of the sublimated ink sheet 105 is transferred and fixed to the receiving layer of the paper 112 pressed by the platen roller 104 to form an image. Even during printing, back tension is generated on the ink sheet supply side bobbin 110, and the ink sheet 105 is prevented from being wrinkled by being pulled only on the winding side.

  After the transfer of each color of Y / M / C color is completed in this way, the OP layer 204 is melted by the heat of the heating element of the thermal head 109 to form a protective layer that coats the surface of the color image of the transferred paper. To do. When printing of one color image is completed in this manner, the 112 paper for conveyance is conveyed in the B direction, the continuous paper is cut into a desired size by the cutter 111, and the printed paper 112 is rotated by the rotation of the paper discharge roller 107. The paper is discharged outside the printer.

  FIG. 3 is a perspective view of an ink sheet cassette (ink ribbon cassette) used in the present embodiment. FIG. 3A is a perspective view of parts included in the cassette. Both the ink sheet supply bobbin 110 and the take-up bobbin 108 have the same ink sheet bobbin 300 at the winding center, and the end of the ink sheet 105 is wound around each bobbin shaft portion 301. On one flange surface of the ink sheet bobbin 300, there are concave portions 302 provided radially to stop the rotation of the ink sheet bobbin 300 in a single cassette state not loaded in the printing apparatus. A bobbin locking rib provided inside the cassette, which will be described later, is urged in the engagement direction by being pressed against the recess 302 by a spring 304 that is an elastic means as a bobbin urging means, and the bobbin rotation is stopped. Reference numeral 303 denotes a rotation engagement rib for transmitting the rotational force from the printing apparatus to the ink sheet bobbin 300.

  FIG. 3B is an external perspective view of the ink sheet cassette. The ink sheet supply side bobbin 110 is covered with a supply side cover 306, and the ink sheet winding side bobbin 108 is covered with a winding side cover 305, and both ends of the supply side cover 306 and the winding side cover 305 are connected by ribs 307. ing. The ink sheet 105 is exposed in the portion surrounded by the ribs 307 and the covers 305 and 306 on both sides, and the thermal head 109 moves up and down in this space to press the ink sheet 105 against the paper 112.

Next, the back tension mechanism of this embodiment will be described with reference to FIGS. FIG. 4 is a perspective view of the chassis and back tension generating means of the printing apparatus of this embodiment. FIG. 5 is a cross-sectional view illustrating a state in which the ink sheet cassette of the present embodiment is loaded in the printing apparatus on the ribbon supply side.
FIG. 4A shows the chassis 400 and the back tension generating means 10 extracted from the printing apparatus according to the present embodiment. The chassis 400 is integrally formed by press bending. An ink sheet cassette loading port 401 is open on one end side, and a back tension generating means that engages with the rotation engaging portion 303 of the ink sheet supply side bobbin 110 on the other end side that is the back side in the ink sheet cassette loading direction. 10 is provided.

  FIG. 4B is a perspective view of the back tension generating means 10. An aperture portion 409 is recessed in the rear chassis surface (side surface) in the ink sheet cassette loading direction, and a shaft 410 is planted by caulking or the like in the recess surface (bottom surface) of the aperture portion 409. An annular felt 402 serving as a back tension generating member around the shaft 410 is fixed with a double-sided tape on the concave surface of the narrowed portion 409. The felt 402 is disposed corresponding to the ink sheet supply side bobbin 110. The felt 402 is generally made by compressing sheep or rabbit hair.

  Here, when the frictional force is generated between the felt and the resin, the variation of the static frictional force and the dynamic frictional force is small as compared with the case where the frictional force is generated between the resin and the resin, depending on the material. That is, by using the felt 402 as a back tension generating member, the difference in back tension between the start of movement of the ink sheet supply side bobbin 110 and the movement thereof can be reduced. A presser 403 is rotatably fitted and supported on a shaft 410 serving as a rotation shaft. Furthermore, the presser 403 is pressed against the felt 402 side and elastically contacted by the elastic force of the back tension spring 405 (first elastic member) mounted between the E-ring 406 provided on the shaft 410 and the presser 403. A convex surface (not shown) concentric with the shaft 410 is formed on the contact surface of the presser 403 with the felt 402, and back tension is generated when the convex and concave portions are in close contact with the felt 402 with a predetermined pressure.

  When the back tension is generated by the frictional force of the felt 402, it is important to appropriately set the contact area with the presser 403 facing the felt 402. That is, the frictional force generated, that is, the back tension is likely to vary only by increasing the spring force of the back tension spring 405. In the configuration of the present invention, the friction generating surfaces of the felt 402 and the presser 403 that require a large area and a large outer diameter are disposed on the back side in the cassette loading direction in response to the necessity of a relatively large back tension force. Arrange along the end face. As a result, parts that require a large area and a large outer diameter do not move in the longitudinal direction of the shaft 410 in the printing apparatus and only rotate within a predetermined space, thereby affecting the operation and arrangement of other parts. It is hard to come out.

  Further, by narrowing down the chassis surface in the loading direction of the ink sheet cassette and burying the friction generating surfaces of the felt 402 and the presser 403 in the concave surface 409, the influence on the space use of other parts is further reduced. . Further, the felt 402 is not simply sandwiched between the chassis 400 and the presser 403, but the felt 402 is fixed to the chassis 400, which is a fixed surface, with double-sided tape. For this reason, the back tension is established due to the rotational friction between the felt 402 and the presser 403. As the sliding friction between the chassis 400 and the felt 402 is not changed, the sliding friction between the felt 402 and the presser 403 is stably generated immediately after the presser 403 rotates.

  In the present embodiment, the chassis 400 side is used for fixing the felt 402. However, the felt 402 and the presser 403 may be fixed with a double-sided tape or the like with the chassis 400 and the felt 402 in a movable relationship.

  In FIG. 4B, 404 is a bush fitted to the shaft 410 so as to be rotatable, and is engaged with the rotation engaging portion 303 of the ink sheet supply side bobbin 110 (see FIG. 4A). Match. The bush 404 is biased toward the C ring 408 provided at the tip of the shaft 410 by a bush spring 407 (second elastic member) mounted between the bush 404 and the E ring 406. Note that the back tension spring 405 and the bush spring 407 are independent of each other via the E-ring 406 so that the mutual spring force is not transmitted.

  The bush 404 includes a rib 404a formed as a protrusion extending in a comb-teeth shape in the longitudinal direction of the shaft, and the rib 404a is also formed as a protrusion extending in a comb-teeth shape from the presser 403 in the longitudinal direction of the shaft. 403a and movably fit in the longitudinal direction of the shaft. The bush 404 has an engagement portion 404 b that engages with the rotation engagement portion 303 of the ink sheet supply side bobbin 110. The bush 404 can be rotated integrally with the presser 403 and is pivotally supported so as to be relatively movable in the axial longitudinal direction. When the ink sheet cassette is loaded in the printing apparatus and the ink sheet bobbin 300 pushes the bush 404, the bush 404 is pushed in the longitudinal direction of the shaft 410. By being pushed in, the rotation engaging portion 303 of the ink sheet supply side bobbin 110 and the engaging portion 404b of the bush 404 are engaged. Then, the ink sheet winding side bobbin 108 is driven to wind and the ink sheet 105 is pulled, whereby the ink sheet bobbin 301 starts to rotate.

  Thereby, the back tension generated between the felt 402 and the presser 403 is transmitted to the rib 404a through the rib 403a as the back tension torque that makes it difficult to turn the presser 403. When a large back tension is required, the back tension spring 405 is strengthened. The back tension spring force is transmitted to the bush 404 only as a back tension torque in the rotational direction generated at the center of the shaft 410, and is not transmitted to the bush spring 407 as a pushing force in the longitudinal direction of the shaft across the E ring 406.

  FIG. 5A is a cross-sectional view when an ink sheet cassette is loaded. In the first position where the ink sheet cassette is not fully loaded in the printing apparatus, the recess 302 of the ink sheet supply side bobbin 110 is connected to a bobbin locking rib 308 provided inside the supply side cover 306 of the cassette cover by a spring 304. It has been put together. As a result, the rotation of the ink sheet supply side bobbin 110 is restricted. The ink sheet cassette is loaded while pushing the inclined surface of the cassette lock lever 502 provided in the ink sheet cassette loading slot 401 (see FIG. 4A) of the printing apparatus. The cassette lock lever 502 is urged in the cassette locking direction by a spring 501 mounted between the cassette 500 and a component 500 forming the ink sheet cassette loading port 401 of the printing apparatus. The ink sheet cassette is resisted against this urging force. To load.

  FIG. 5B is a cross-sectional view when the ink sheet cassette is loaded. At the second position where the ink sheet cassette is completely loaded into the printing apparatus, the cassette lock lever 502 moves by the biasing force of the spring 501 in the direction along the surface of the supply side cover 306 (see arrow C in FIG. 5B). ). This determines the position in the loading direction of the ink sheet cassette in the printing apparatus. Thus, the cassette lock lever 502 holds the ink sheet cassette at a predetermined position in the apparatus. The rotation engagement portion 303 of the ink sheet bobbin 300 and the engagement portion 404b of the bush 404 are in phase, and the ink sheet bobbin 300 is pushed in the longitudinal direction of the bobbin by the urging force of the bush spring 407. Then, since the urging force of the bush spring 407 is stronger than the spring 304, the ink sheet bobbin 300 is pushed back to a position where it abuts on the support portion 309 provided inside the supply side cover 306. In this state, the engagement between the recess 302 and the bobbin locking rib 308 is released, and the ink sheet supply side bobbin 110 is in a rotatable state inside the ink sheet cassette. Although the spring 405 is compressed at the position of FIG. 5B rather than the position of FIG. 5A, the compression force is not transmitted to the back tension spring 405 because the E-ring 406 is interposed. Therefore, even if the bobbin 300 position is slightly shifted at the cassette loading completion position due to the dimensional tolerance of the ink sheet cassette parts, the generated back tension force is not affected.

  As shown in FIG. 5, a back tension spring 405 for generating back tension and a bush spring 407 for urging the bush 404 are arranged coaxially in series. Further, the presser 403 and the bush 404 are also coaxially arranged in series, and a rib that fits the power transmission of the back tension in the axial direction is used, so that the shaft outer diameter portion and the shaft protruding from the chassis 400 of the back tension generating means 10 can be used. A portion moving in the longitudinal direction can be reduced. Since the shaft outer diameter portion protruding from the chassis 400 and the portion moving in the longitudinal direction of the shaft can be reduced, a degree of freedom is created in the movable space and arrangement space of the surrounding components, and the printing apparatus can be downsized.

  In order to take out the ink sheet cassette from the printing apparatus, when the cassette lock lever 502 is pulled up in the direction opposite to the urging direction of the spring 501, the holding by the cassette lock lever 502 is released. And it is urged | biased so that it may detach | leave out of an apparatus with the urging | biasing force of the bush spring 407, and it jumps out like the state of Fig.5 (a). In the present embodiment, the spring 405 that generates back tension and the bush spring 407 that applies a biasing force to the bush 404b are made independent from each other with the E ring 406 as a boundary, and the spring force can be set separately. Therefore, even if the spring 405 is strengthened to generate a strong back tension force, the ink sheet cassette does not jump out too much.

In this embodiment, since a relatively high back tension force is generated, the spring force generated in the state shown in FIG. 5B when the ink sheet cassette is completely loaded is the back tension spring 405> the bush spring 407> the spring for bobbin shifting. The relationship is 304.
In order to generate a more accurate back tension force, a washer or the like may be interposed between the end portions of the back tension spring and the ribbon bush spring to reduce the rotational sliding friction of the spring end portion.

105 Ink sheet 110 Ink sheet supply side bobbin 108 Ink sheet take-up side bobbin 400 Chassis 402 Felt 403 Presser 404 Bush 405 Back tension spring 406 E ring 407 Bush spring 408 C ring 409 Chassis restrictor 410 Shaft 502 Cassette lock lever

Claims (8)

A printing apparatus including a back tension mechanism that engages with an ink ribbon bobbin to apply a back tension,
Holding means for holding the ink ribbon cassette loaded in the apparatus at a predetermined position;
A back tension generating member disposed at a position corresponding to the ink ribbon bobbin on the back side in the loading direction of the ink ribbon cassette;
A presser elastically attached to the back tension generating member and rotatably mounted around its rotation axis;
A bush that can be integrally rotated coaxially with the presser and is supported so as to be relatively movable in the axial direction of the rotation shaft, and that engages with the ink ribbon bobbin;
A printing apparatus provided with a back tension mechanism, wherein when the holding by the holding means is released, the ink ribbon cassette is urged through the bush so as to be detached from the apparatus. A first elastic member that urges the presser to elastically contact the back tension generating member;
The back according to claim 1, further comprising a second elastic member that is provided independently of the first elastic member and urges the bush so as to engage with the ink ribbon bobbin. Printing device with tension mechanism.   The ink ribbon cassette includes a bobbin urging unit that urges the ink ribbon bobbin in an engaging direction, and the ink ribbon bobbin and the cassette. The printing apparatus having a back tension mechanism according to claim 2, further comprising an engagement portion between the covers. At a first position in the apparatus of the ink ribbon cassette, the ink ribbon bobbin and the bush are disengaged, and the ink ribbon bobbin and the cassette cover are engaged by the engaging portion, so that the ink ribbon The bobbin is restricted from rotating,
The ink ribbon bobbin and the bush are engaged at the second position in the apparatus of the ink ribbon cassette, and the ink ribbon bobbin can be rotated by releasing the engagement between the ink ribbon bobbin and the cassette cover. A printing apparatus comprising the back tension mechanism according to claim 3.   The printing apparatus having a back tension mechanism according to any one of claims 1 to 4, wherein the presser and the bush are engaged with each other via protrusions protruding in a comb-like shape in the axial direction. .   The back tension mechanism according to any one of claims 2 to 5, wherein the first elastic member and the second elastic member are arranged in series along a rotation axis of the presser. Printing device.   7. The back tension according to claim 1, wherein the back tension generating member is fixed to at least one of a fixing surface on the back side in the loading direction of the ink ribbon cassette and the presser. 8. Printing device with mechanism.   The urging force is set to be larger in the order of the first elastic member, the second elastic member, and the bobbin urging means in a state where the ink ribbon cassette is held by the holding means. Printing device equipped with a back tension mechanism.

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