JPH08244319A - Ink ribbon cassette - Google Patents

Abstract

PURPOSE: To simplify a structure and to reduce the manufacturing cost by providing under a propping condition and freely removably a rigid press operating member which brings one feed roll into press contact under a specified pressure with another feed roll. CONSTITUTION: A holding part 7A is rotated under a condition wherein an arc-shaped cam face part 8A in which the dimension from the center of the holding part 7A becomes longer with approaching to the existing side of the operating part 7B is brought into contact with a bump face 10. With rotation of this holding part 7A around the center, the dimension from the center of the holding part 7A to a position where the bump face 10 is brought into contact with the arc-shaped cam face part 8A becomes long and a following feed roll 5 approaches to a driving feed roll 4 side along a guide part and the ribbon holding part 5A of the following feed roll 5 is brought into press contact under a specified pressure with the ribbon holding part 4A of the driving roll 4. Then, a flat cam face part 8B being continued to the can face part of the holding part 7A is brought into contact with the bump face 10 to make a propping condition where the following feed roll 5 is brought into press contact with the driving feed roll 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a pair of feed rolls for driving in a cassette case for accommodating an ink ribbon while the ink ribbon is sandwiched between the feed rolls. The present invention relates to an ink ribbon cassette in which a guide portion for movably guiding in a perspective direction is formed on the inner surface of the cassette case, and the cassette case is configured to be openable and closable in the ribbon width direction.

[0002]

2. Description of the Related Art As a conventional ink ribbon cassette,
Of the separable main body case and lid case that form the cassette case, the driven feed roll is rotatably fixed to the inner surface of the main body in the perspective direction with respect to the drive feed roll. While forming a groove-shaped guide portion for movably guiding, the inner surface of the lid case is in contact with the inner surface of the central shaft hole of the driven feed roll,
A cam shaft member for fixing the driven feed roll to the drive feed roll at a predetermined pressure according to the joining operation of both case parts is fixed (for example, Japanese Utility Model Publication No. 5-38948).
(See Japanese Laid-Open Patent Publication No. 2004-242242), or of the separable main body case portion and lid case portion that form the cassette case, a holder that rotatably supports the driven feed roll is provided on the bottom surface of the main body case portion, with respect to the drive feed roll. And a driven feed roll is pressed against the drive feed roll with a predetermined pressure between the recess formed on the back side of the holder and the recess formed on the inner surface of the main body case. A device having a coil spring interposed (see, for example, Japanese Utility Model Laid-Open No. 2-88766) is proposed. In the former case of the related art, when the lid case is removed from the main body case when the new ink ribbon is loaded, the cam shaft member of the lid case causes the driven feed roll to press the driven feed roll. Since it is released, a large work space for inserting the ink ribbon can be exposed between both feed rolls. Also, in the case of the latter of the related art, when loading a new ink ribbon, the lid case is removed from the main body case, and the holder is retracted to the non-holding position against the elastic force of the coil spring, so that both feeds are A large working space for inserting the ink ribbon between the rolls can be exposed.

[0003]

However, in the former case of the prior art, since the cam shaft member for pressingly moving the driven feed roll to the drive feed roll is integrally formed in the lid case portion, both feed rolls are not formed. When changing the pressure contact force, in other words, the distance between the axes of both feed rolls according to the conditions such as the ribbon thickness of the ink ribbon and the composition of the ink, it is necessary to remake the entire lid case part including the cam shaft member. I won't. Therefore, in order to manufacture multiple types of ink ribbon cassettes with different pressure contact forces,
A mold for manufacturing a lid case portion of a type corresponding to the type is required, and the manufacturing cost is likely to increase. Further, in the case of the latter of the related art, even when the pressure contact force of both feed rolls, in other words, the axial distance of both feed rolls is changed according to conditions such as the ribbon thickness of the ink ribbon and the ink composition, Although it is only necessary to replace it with a coil spring with a corresponding spring performance, there are multiple parts such as a holder that rotatably supports the driven feed roll, a pivot for attaching the holder to the main body case, and a coil spring. Since it is necessary and much labor is required for the assembling work, the manufacturing cost is likely to increase.

The present invention has been made in view of the above circumstances, and an object thereof is to easily reveal a large working space for inserting an ink ribbon between both feed rolls when a new ink ribbon is loaded. In addition, it is possible to manufacture a plurality of types of ink ribbon cassettes having different pressure contact forces, while simplifying the structure and advantageously manufacturing in terms of manufacturing cost.

[0005]

A first characteristic structure according to the present invention for achieving the above object is to provide a pair of feed rolls which are driven and run while sandwiching the ink ribbon in a cassette case accommodating the ink ribbon. Is provided on the inner surface of the cassette case, and the cassette case is openable and closable in the ribbon width direction. In the ink ribbon cassette configured in, between the one feed roll movable along the guide portion of the cassette case and the inner surface of the cassette case, the one feed roll with respect to the other feed roll. The point is that a rigid pressing member that presses with a predetermined pressure is detachably installed in a stretched state. That.

In a second characteristic configuration according to the present invention, a movement restricting portion is formed on the inner surface of the cassette case to prevent movement of the pressing operation member in the stretched posture toward the pressing release side by abutment or engagement. There is a point.

A third characteristic structure according to the present invention is that each of the ribbon holding portions of the both feed rolls is made of a soft resin which can be elastically compressed and deformed in a diametrical direction.

In a fourth characteristic structure according to the present invention, the pressing operation member comprises a holding portion for holding one feed roll rotatably and an operating portion for rotating the holding portion around its center. Along with the rotation of the holding portion around the center of the holding portion in contact with the inner surface of the cassette case on the outer peripheral side of the holding portion, one feed roll to the other feed roll. On the other hand, there is a cam surface which is brought into pressure contact with a predetermined pressure.

In a fifth characteristic configuration according to the present invention, the cam surface has an arcuate cam surface portion that moves one feed roll closer to the other feed roll as the cam rotates around the center of the holding portion, and Of the flat cam surface portion which holds the feed roll of the other feed roll in a tensioned state in which it is pressed against the other feed roll at a predetermined pressure.

[0010]

According to the structure of the first aspect, when a new ink ribbon is loaded, the cassette case is opened in the ribbon width direction, and then provided between the one feed roll and the inner surface of the cassette case in a tensioned state. By removing the pressing operation member, one feed roll can be freely moved along the guide portion of the cassette case to the side separated from the other feed roll.
It is possible to expose a large work space for inserting the ink ribbon between both feed rolls. Moreover, even when the pressure contact force of both feed rolls, in other words, the axial distance between both feed rolls is changed according to conditions such as the ribbon thickness of the ink ribbon and the ink composition, one of the pressing operation members is It is only necessary to prepare a plurality of types having different dimensions from the portion in contact with the feed roll to the portion in contact with the inner surface of the cassette case.

According to the second aspect of the present invention, the movement restricting portion provided on the cassette case releases the lock of the pressing operation member provided in a tensioned state between the one feed roll and the inner surface of the cassette case. Since the movement to the side can be prevented, the pressure contact force of both feed rolls does not change due to vibration or the like that acts during use.

According to the third aspect of the invention, even when the end connecting portion of the ink ribbon having a thickness twice that of the other portion is transferred between the ribbon holding portions of both feed rolls,
This change in wall thickness can be absorbed by elastic compression deformation of the ribbon holding portion inward in the diametrical direction.

According to the structure of claim 4, since one of the feed rolls is rotatably held by the holding portion of the pressing operation member, the operation portion of the pressing operation member is operated at the time of assembly after loading the ribbon. When one feed roll is brought into pressure contact with the other feed roll, the one feed roll does not come off from the pressing operation member.

According to the fifth aspect of the invention, when the operation portion of the pressing operation member is rotated during assembly after loading the ribbon, the arcuate cam surface portion of the cam surface and the inner surface of the cassette case come into contact with each other. After one feed roll held by the pressing operation member smoothly moves toward the other feed roll side, the pressing operation is performed by the contact between the flat cam surface part following the arcuate cam surface part and the inner surface of the cassette case. The member is securely held in the stretched posture.

[0015]

According to the ink ribbon cassette of the first aspect, when a new ink ribbon is loaded, not only a large working space for inserting the ink ribbon between the feed rolls can be easily exposed, but also a part Also, only the pressing operation member having rigidity is required, and since the pressing force of both feed rolls can be arbitrarily changed by preparing a plurality of pressing operation members having different dimensions, the pressing force is different. A plurality of types of ink ribbon cassettes can be advantageously manufactured in terms of manufacturing cost while simplifying the structure.

An ink ribbon cassette according to a second aspect is
Since the pressure contact force of both feed rolls can be maintained at the set pressure for a long period of time, the running of the ink ribbon can be stabilized.

The ink ribbon cassette according to claim 3 is
Since the ribbon gripping part of both feed rolls is only composed of soft resin, while achieving the intended simplification of the structure, the ribbon running such as catching or clogging due to the thickness change of the ink ribbon Trouble can be avoided.

An ink ribbon cassette according to a fourth aspect is
The assembling work after loading the ribbon can be easily performed.

The ink ribbon cassette according to claim 5 is
The pressure contact operation of both feed rolls after ribbon loading can be performed smoothly, and even if vibration etc. acts during use, it is possible to prevent the pressing operation member in the tensioned position from moving to the unlocking side. Therefore, the pressure contact force of both feed rolls does not change, and the ink ribbon running can be stabilized.

[0020]

【Example】

[First Embodiment] As shown in FIG. 6, a cassette case CA for accommodating an ink ribbon R includes a main body case 1 made of synthetic resin in which a pair of left and right ribbon guide arms 1A and 1B are integrally formed. It is composed of a lid cover 2 made of synthetic resin, which is joined to the main body case 1 from the ribbon width direction to openably and closably close the opening of the main body case 1. A ribbon storage portion 3 which is long in the left and right direction is formed in the main body case 1, and a pair of feed rolls 4 and 5 for driving the ink ribbon R in a sandwiched state are provided on the inlet side of the ribbon storage portion 3. And this feed roll 4,
The ink ribbon R pulled out from the outlet of the ribbon storage portion 3 by the driving rotation of the drive roller 5 is moved to both the ribbon guide arms 1A and 1A.
It passes through the printing section between B and is folded and stored in the ribbon storage section 3.

Of the pair of feed rolls 4 and 5,
As shown in FIGS. 1 to 3, the drive-side feed roll 4 is formed on the main body case 1 and a ribbon holding portion 4A composed of three upper and lower gears 4a that contact three positions in the ribbon width direction of the ink ribbon R. A first shaft portion 4B rotatably inserted into the through hole 1a, and a second shaft portion 4C protruding from the upper end of the ribbon holding portion 4A through the through hole 2a formed in the lid cover 2 to the outside of the case. Is integrally molded with a resin material and has a ribbon holding portion 4A.
The drive feed roll 4 is positionally regulated with respect to the main body case 1 by rotatably fitting and holding the small-diameter shaft portion 4b between the adjacent gears 4a in the main body case 1. ing. Of the central shaft hole of the drive feed roll 4, an inner peripheral surface having a depth from the first shaft portion 4B to the ribbon holding portion 4A is fitted to a drive shaft provided in a recording device such as a printer (not shown). Then, a power transmission locking projection 4c for transmitting the rotational force of the drive shaft to the feed roll 4 is formed, and the looseness of the ink ribbon R is removed on the outer peripheral surface of the second shaft portion 4C. Knurled for easy manual rotation at times. Further, the other feed roll 5 on the driven side has a ribbon holding portion 5A composed of three upper and lower gears 5a capable of meshing with the respective gears 4a of the drive feed roll 4, and FIG.
A shaft portion that is partitioned by ribs 1b formed in the main body case 1 shown in FIG. 5B and 5B are integrally molded with a resin material, and a small-diameter shaft portion 5b between the adjacent gears 5a of the ribbon holding portion 5A is relatively rotatable with a pressing member 7 made of a synthetic resin having rigidity. Is held in place. The guide portion 1c includes the driven feed roll 5
When moving the driven feed roll 4 closer to the driven feed roll 4, the moving direction of the driven feed roll 5 is regulated by the contact between the first shaft portion 5B of the driven feed roll 5 and the rib 1b. The pressing operation member 7 includes a holding portion 7A that rotatably fits and holds the small-diameter shaft portion 5b of the driven feed roll 5, and the holding portion 7A around its center (the axis of the driven feed roll 5). And a rotation part 7B for rotating around the center of the holding part 7A while being in contact with the inner surface of the main body case 1 on the outer peripheral side of the holding part 7A. The driven feed roll 5 to the drive feed roll 4
There is formed a cam surface 8 which is brought into pressure contact with the above with a predetermined pressure.

In the ink ribbon cassette of this embodiment, as shown in FIG. 1, the drive feed roll 4 is mounted in the main body case 1 in which the drive feed roll 4 is always fixed in position via a holding member 6. The driven feed roll 5 is mounted in a state of being separated from the roll 4, and the ink ribbon R loaded in the ribbon storage portion 3 is passed through the gap S between the ribbon holding portions 4A, 5A of the both feed rolls 4, 5 to a predetermined distance. Arranged along the ribbon running path,
After that, as shown in FIGS. 2 and 3, the driven feed roll 5 is rotated with respect to the drive feed roll 4 by rotating the pressing operation member 7 around the center of the holding portion 7A (same as the axis of the driven feed roll 5). The ink ribbon R disposed in the gap S between the ribbon holding portions 4A and 5A is held by the both ribbon holding portions 4A and 5A while being pressed against each other with a predetermined pressure and maintaining the state. The ink ribbon R is configured to be applied with a predetermined driving force.

Next, FIGS. 1, 2 and 5 (a), (b)
Based on the above, the driven feed roll 5 is attached to the main body case 1
The operation until the driven feed roll 5 is attached to the drive feed roll 4 and is held in pressure contact with the drive feed roll 4 will be described. Main body case 1 of the driven feed roll 5
As shown in FIGS. 1 and 5 (a), the mounting of the driven feed roll 4 is performed while the gap S is formed between the ribbon holding portion 4A of the drive feed roll 4 and the ribbon holding portion 5A of the driven feed roll 5. The shaft portion 5B of the feed roll 5 is received and held by the end portion side of the guide portion 1c opposite to the drive feed roll 4 side. At this time, the holding portion 7A has a raised surface 10 on the inner surface of the side wall of the main body case 1 that faces the drive feed roll 4 with the axis of the driven feed roll 5 in between.
The ribbon storage portion 3 is slightly offset and positioned, and the operation portion 7B is positioned inside the ribbon storage portion 3. Next, as shown in FIGS. 2 and 5B, the switching operation for bringing the driven feed roll 5 mounted in the main body case 1 into pressure contact with the drive feed roll 4 is performed by changing the operation portion 7B to the holding portion. 7
When a rotation operation is performed around the center A toward the raised surface 10 (in the direction of arrow a in FIG. 1), of the cam surfaces 8 formed on a part of the outer peripheral surface of the holding portion 7A, the holding portion is closer to the operating portion 7B side. 7
The holding portion 7A is rotationally operated in a state in which the arc-shaped cam surface portion 8A having a long dimension from the center A is brought into contact with the raised surface 10, and as the holding portion 7A rotates about the holding portion 7A center, The dimension from the center of the holding portion 7A to the contact position between the raised surface 10 and the arcuate cam surface portion 8A becomes longer, and the driven feed roll 5 is driven along the guide portion 1c.
The ribbon holding portion 5A of the driven feed roll 5 presses the ribbon holding portion 4A of the drive feed roll 4 at a predetermined pressure, and then the cam surface portion of the holding portion 7A with respect to the raised surface 10 is moved. 8A, which is a flat cam surface 8 continuous with 8A
B is brought into contact with the driven feed roll 5 so that the driven feed roll 5 is brought into press contact with the drive feed roll 4 at a predetermined pressure, and is in a tensioned state. still,
Since the flat cam surface portion 8B is formed on a flat surface that intersects at right angles with an imaginary line connecting the axes of the feed rolls 4 and 5 in the tensed state, the urging force is normally applied in the direction along the imaginary line. Since it acts only and the component force in the direction intersecting the imaginary line does not act, it is possible to maintain this bulging posture, and therefore, it does not return to the pressing release side when no external force acts. When the holding portion 7A is in the stretched state, the operating portion 7B is located on the side wall side of the ribbon storage portion 3, and the operating portion 7B is also used as a part of the side wall of the ribbon storage portion 3.

When the lid cover 2 is joined to the body case 1 and the opening of the body case 1 is closed while the holding portion 7A is held in a stretched state on the inner surface of the lid cover 2, the operation portion 7B is Engage in the formed fitting hole 7a,
A pin serving as a movement restricting portion 2A that prevents the pressing operation member 7 in the stretched posture from moving toward the pressing release side by an external force such as vibration caused by the driving rotation of the both feed rolls 4 and 5 or an impact when dropped. Are integrally formed.

When the ink ribbon R in the cassette case CA assembled as described above is repeatedly used and needs to be replaced with a new ink ribbon R, the lid cover 2 is removed from the main body case 1, and the main body is removed. The opening of the case 1 is opened, and from this state, the operation portion 7A of the pressing operation member 7 is opened.
When the rotating operation is performed in the direction opposite to the pressing direction, the holding portion 7A
Is released, the used ink ribbon R is taken out from between the feed rolls 4 and 5, and is taken out from the inside of the main body case 1 again, and the unused ink ribbon R is again returned to the cassette case CA by the same procedure as described above. By storing it inside, it is possible to replace it with an unused ink ribbon R.

[Second Embodiment] In the above-described embodiment, when the holding portion 7A is in the tensioned state, the operation portion 7B is moved to the ribbon accommodating portion 3.
Located on the side wall side of the ribbon storage unit 3
Although it is configured so that it also serves as a part of the side wall, the operating portion 7B may be formed to have a short length as shown in FIGS. In the case of this embodiment, the operation portion 7B rarely serves as a part of the side wall of the ribbon storage portion 3, but on the other hand, when the ink ribbon R is replaced, the operation portion 7B is inserted into the ribbon storage portion 3. Since the protrusion margin is small, it is easy to facilitate the work of loading the ink ribbon R. When the lid cover 2 is joined to the main body case 1 to close the opening of the main body case 1 on the inner surface of the lid cover 2, the operation portion 7B is formed.
As a movement restricting portion 2A that abuts against the distal end side of the feed rolls 4 and 5 and that prevents the pressing operation member 7 in the stretched posture from moving to the pressing release side due to vibration or the like due to the drive rotation of the feed rolls 4 and 5. Contact piece is integrally formed. Other configurations are the same as in the first embodiment.

[Third Embodiment] In the above embodiments, the ribbon holding portions 4A and 5A of both feed rolls 4 and 5 are integrally formed with a pair of upper and lower gears 4a and 5a, respectively. As shown in FIG. 9, instead of the gears 4a and 5a, the ribbon holding portions 4A and 5 of both feed rolls 4 and 5 are replaced.
The annular bodies 9 made of urethane rubber or thermoplastic elastomer, which is an example of a soft resin elastically and compressively deformable in the diametrical direction, may be fitted onto the upper and lower sides of each outer peripheral surface of A. Other configurations are the same as in the first embodiment. still,
In the said 3rd Example, although the outer peripheral surface of each annular body 9 was comprised and implemented as a smooth circumferential surface, it implement | achieves a gear to each outer peripheral surface of each annular body 9 like 1st Example. It may be formed integrally.

[Fourth Embodiment] In each of the above-described embodiments, the holding portion 7A of the pressing operation member 7 is moved by the rotational movement of the pressing operation member 7 to the inner surface of the main body case 1 (specifically, the raised surface 10 on the inner surface of the side wall). ) And the driven feed roll 5 are held in a tensioned state, and the driven feed roll 5 is configured to come into pressure contact with the drive feed roll 4 at a predetermined pressure, but as shown in FIG. Depressing operation member 7
Of the holding portion 7A for rotatably holding the driven feed roll 5 and the holding portion 7A along the inclined inner surface 11 of the side wall inner surface of the main body case 1 that is closer to the driving feed roll 4 toward the driving feed roll 4 side. The driven feed roll 5 is also composed of an operating portion 7B for sliding operation in the abutting state, and as the holding portion 7A slides along the inclined inner surface 11 toward the drive feed roll 4 side. It moves closer to the drive feed roll 4 side along the guide portion 1c on the main body case 1 side substantially parallel to the inclined inner surface 11, and at the end of the slide movement, the holding portion 7
A may be configured so that the driven feed roll 5 is pressed against the drive feed roll 4 at a predetermined pressure between the inclined surface 11 and the driven feed roll 5 in a stretched posture.
As shown in FIG. 11, on the bottom surface of the main body case 1, at the position where the holding portion 7A is in the stretched posture, the operation portion 7 is provided.
An engaging piece is integrally formed as a movement restricting portion 2A that engages with the tip end side of B to prevent the pressing operation member 7 in the stretched posture from moving to the pressing release side. The piece is configured to elastically bend and deform toward the disengagement side by contact with the bottom surface of the pressing operation member 7 when the pressing operation member 7 slides to the tension position.
Other configurations are the same as in the first embodiment.

Other Embodiments In each of the above embodiments, the drive feed roll 4 is rotatably fitted and held by the holding member 6 fixed to the main body case 1 to regulate the position with respect to the main body case 1. However, the holding member 6 may be omitted, and the posture may be held by inserting the first shaft portion 4B of the drive feed roll 4 into the through hole 1a of the main body case 1 to hold the posture. In this case, in the assembled state of the cassette case CA, the drive feed roll 4 is axially supported between the through hole 1a of the main body case 1 and the through hole 2a of the lid cover 2 and is held in a both-sided holding posture. The drive feed roll 4 and the driven feed roll 5
And may be interlocked by a gear provided on the shaft end side away from both ribbon holding portions 4A, 5A. Each of the drive feed roll 4 and the driven feed roll 5 has small diameter shaft portions 4b, 5b formed at the upper and lower intermediate portions of the ribbon holding portions 4A, 5A fitted and held by a holding member 6 or a pressing operation member 7. However, the present invention is not limited to this configuration, and small-diameter shaft portions are formed on the upper and lower end sides of the ribbon holding portions 4A and 5A, and the small-diameter shaft portions are externally fitted by the holding member 6 or the pressing operation member 7. It may be configured to be held, and its specific configuration can be variously changed. The ink ribbon cassette of the present invention may have an ink tank provided in the cassette case CA, in which case the ink in the ink tank may be transferred to the ink ribbon via the feed roll. ,
The ink in the ink tank may be transferred to the ink ribbon via a dedicated transfer roll.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a main part before holding an ink ribbon.

FIG. 2 is a partial cross-sectional view of a main part after holding an ink ribbon.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged view of the main part of the main body case.

FIG. 5 is a conceptual diagram of main parts.

FIG. 6 is a partially cutaway plan view of the entire cassette case.

FIG. 7 is a partial cross-sectional view of a main part before holding the ink ribbon of the second embodiment.

FIG. 8 is a partial cross-sectional view of a main part of the ink ribbon of the second embodiment after being held.

FIG. 9 is a partial cross-sectional view of an essential part of the ink ribbon of the third embodiment after being held.

FIG. 10 is a partial cross-sectional view of an essential part of the ink ribbon of the fourth embodiment after being held.

11 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

 1c Guide part 4 Feed roll 5 Feed roll 7 Pressing operation member 7A Holding part 7B Operating part 8 Cam surface 8A Cam surface part 8B Flat cam surface part R Ink ribbon CA cassette case

Claims (5)

[Claims] 1. A pair of feed rolls (4), which are driven and run in a state where the ink ribbon (R) is sandwiched in a cassette case (CA) that houses the ink ribbon (R).
(5) is provided, and the guide portion (1c) for guiding one feed roll (5) to the other feed roll (4) in a perspective direction is provided with the guide portion (1c).
An ink ribbon cassette, which is formed on the inner surface of A) and in which the cassette case (CA) is configured to be openable and closable in the ribbon width direction, along an guide portion (1c) of the cassette case (CA). Between the one movable feed roll (5) and the inner surface of the cassette case (CA), the one feed roll (5) is pressed against the other feed roll (4) at a predetermined pressure. An ink ribbon cassette in which a pressing operation member (7) is provided so as to be detachable in a stretched state. 2. A movement restricting portion (2) for preventing movement of the pressing operation member (7) in a tensioned posture toward the pressing release side by abutment or engagement on the inner surface of the cassette case (CA).
The ink ribbon cassette according to claim 1, wherein A) is formed. 3. The ribbon holding portions (4A), (5A) of the both feed rolls (4), (5) are each made of a soft resin elastically and compressively deformable in a diametrical direction. Ink ribbon cassette described. 4. A holding portion (7A) for rotatably holding one of the feed rolls (5) by the pressing operation member (7).
And an operating portion (7B) for rotating the holding portion (7A) around its center, and the cassette case (CA) is provided on the outer peripheral side of the holding portion (7A). A cam surface that presses one feed roll (5) against the other feed roll (4) with a predetermined pressure as the holder (7A) rotates around the center of the holding part (7A) in contact with the inner surface of The ink ribbon cassette according to claim 1, wherein (8) is formed. 5. The cam surface (8) has the holding portion (7).
A) An arc-shaped cam surface portion (8A) for moving one feed roll (5) closer to the other feed roll (4) as it rotates around the center, and one feed roll (5) for the other feed roll (5). The ink ribbon cassette according to claim 4, wherein the ink ribbon cassette comprises a flat cam surface portion (8B) which is held in a tensioned state in which it is pressed against the feed roll (4) at a predetermined pressure.