JP2022060613A - Ink ribbon cassette - Google Patents

Abstract

To provide an ink ribbon cassette which can be disassembled before use but cannot be easily disassembled after use.SOLUTION: An ink ribbon cassette, which rotatably holds an unwinding core and a winding core inside a hollow housing composed of a case and a cover, unwinds an ink ribbon from an unwinding pancake where the ink ribbon is wound around the unwinding core, and winds the ink ribbon by the winding core, has a moving member that is brought into contact with an outer peripheral part of a winding pancake where the ink ribbon is wound around the winding core and is moved in accordance with increase of an outer diameter of the winding pancake, and/or a rotary member that is brought into contact with the outer peripheral part of the unwinding pancake and is moved in accordance with decrease of the outer diameter of the unwinding pancake, in which the moving member is moved in accordance with increase of the outer diameter of the winding pancake, and/or the rotary member is rotated in accordance with decrease of the outer diameter of the unwinding pancake; the moving member and/or the rotary member are engaged with the case and the cover; and the case and the cover are inseparable.SELECTED DRAWING: Figure 2

Description

The present invention belongs to the technical field of an ink ribbon cassette containing a pancake-shaped ink ribbon that is attached to a printer and used.

Conventional ink ribbon cassettes of this type have been conventionally disclosed in Patent Document 1 and the like, and ink ribbon cassettes C are shown in FIGS. 11 to 13 as specific examples of the ink ribbon cassettes.
FIG. 11 is a plan view of the conventional ink ribbon cassette C as viewed from the cover C1 side. FIG. 12 is a plan view (a state before the use of the ink ribbon cassette C, which is a state before the use of the ink ribbon cassette C, and is a winding pan) as seen from the side where the cover C1 is attached with the cover C1 removed in order to show the internal structure of the conventional ink ribbon cassette C. FIG. 13 is a cross-sectional view taken along the line ZZ of FIG. 12, showing a state in which the outer diameter of the cake is small, showing a state of pin fitting with the cover C1 attached, and pin fitting. It is an enlarged view of a part. 14 to 15 show the ink ribbon cassette D in which only the method of joining the case and the cover of the ink ribbon cassette C is changed to the hook stopper. FIG. 14 is a plan view of the case and cover of the conventional ink ribbon cassette C as viewed from the cover D1 side of the ink ribbon cassette D in which only the joining method of the cover is changed to the hook stopper. FIG. 15 is an enlarged view of the ZZ cross section of FIG. 14 and the hook portion. Inside the hollow housing composed of the cover C1 and the case C2 of the ribbon cassette C, the ink ribbon C5 is wound into a pancake shape and the ink unwound from the unwinding core C3 and the unwinding core C3. A take-up core C4 for winding up the ribbon C5 is rotatably provided. Further, the ink ribbon cassette C is formed with a space C10 into which a print head (not shown) of the printer enters when the printer is attached to the printer. At the time of printing with a printer, the ink ribbon C5 is unwound from the unwinding core C3 and drawn out into the space C10, and the ink on the ink ribbon C5 is transferred to the transfer target by the print head and then transferred to the winding core C4. It is taken up.

In this type of ink ribbon cassette, a method called pin fitting or a method called hooking is generally used for joining the cover C1 and the case C2. As shown in FIG. 13, the pin fitting is a method of joining the cover C1 and the case C2 by press-fitting the fitting pin C15 provided on one of the cover C1 and the case C2 into the fitting hole C25 provided on the other. Is. By providing the cover C1 and the case C2 with a plurality of fitting pins C15 and fitting holes C25, the cover C1 and the case C2 can be joined. In the case of pin fitting, the joined parts can be separated by simply pulling out the fitting pin C15 from the fitting hole C25, so that the cover C1 can be separated from the case C2 relatively easily. As shown in FIG. 15, the hook stopper is provided with a hook D15 capable of elastic deformation on one of the cover D1 or the case D2, and the concave portion D7 provided on the hook D15 engages with the convex portion D9 provided on the other. This is a method of joining the cover D1 and the case D2. In FIG. 15, the recess D7 is provided in the hook D15, but the cover D1 and the case D2 can be joined by engaging the convex portion provided in the hook D15 with the concave portion provided in the other. In the hook stopper, since the engagement between the concave portion and the convex portion can be released by elastically deforming the hook D15, the cover D1 can be separated from the case D2 relatively easily as in the case of pin fitting. can.

In this type of ink ribbon cassette, if the cover and case are joined by pin fitting or hooking, the cover and case can be easily joined without using special equipment, and internal parts can be joined before shipping. If it becomes necessary to change the internal parts, or if an internal part is found to be missing and needs to be repaired, the ink ribbon cassette can be easily disassembled by removing the cover from the case, and the internal parts can be replaced. Can be reworked.

However, in such an ink ribbon cassette, since the cover can be easily removed from the case, the used ink ribbon cassette is disassembled and a non-genuine ink ribbon called a so-called pirated ink ribbon of poor quality is packed in the ink ribbon cassette. It may be sold in place. Such pirated ink ribbons may be significantly inferior in quality to genuine products, which is one of the causes of printer failure. As a measure to prevent refilling of pirated ink ribbons, there is a method of joining the case and cover by welding or bonding, but welding requires special equipment and it takes time to apply adhesive to bond. In addition to being necessary, in any case, there is a problem that repair work such as replacement of internal parts cannot be performed if a defect such as a missing part is discovered before shipment.

Japanese Unexamined Patent Publication No. 07-108730

The present invention has been made in view of the above circumstances, and the problem to be solved by the present invention is an ink ribbon cassette that can be disassembled in a state before use but cannot be easily disassembled in a state where the ink ribbon cassette has been used up. To provide.

In the first invention, the unwinding core and the winding core are rotatably held inside a hollow housing composed of a case and a cover, and the ink ribbon is wound from the unwinding pancake in which the ink ribbon is wound around the unwinding core. In an ink ribbon cassette in which the ink ribbon is used for printing by unwinding and winding the ink ribbon with the take-up core.
A moving member provided on the winding core in the housing at a position in contact with the outer peripheral portion of the winding pancake on which the ink ribbon is wound and moves as the outer diameter of the winding pancake increases, and / Alternatively, it has a rotating member that is provided at a position in contact with the outer peripheral portion of the unwound pancake and moves as the outer diameter of the unwound pancake decreases, so that the outer diameter of the unwound pancake increases. The moving member moves accordingly, and / or the rotating member rotates as the outer diameter of the unwound pancake decreases, and the moving member and / or the rotating member becomes a case and a cover. An ink ribbon cassette characterized in that the case and the cover become inseparable when engaged.

The second invention further has a first reversal prevention mechanism for preventing the winding core from rotating in the direction opposite to the winding direction of the ink ribbon, and the case and the cover according to the first invention are inseparable. Described in the first invention, wherein the winding pancake cannot be taken out from the housing in such a state, and the reverse rotation prevention mechanism cannot be released from the outside of the housing. Ink ribbon cassette.

The third invention further has a second reverse rotation prevention mechanism for preventing the unwinding core from rotating in the direction opposite to the winding direction of the ink ribbon, and the second reverse rotation prevention mechanism reverses the ink ribbon from the outside of the housing. The ink ribbon cassette according to the first invention, wherein the prevention function cannot be released.

The fourth invention has a reverse movement prevention mechanism for preventing the moving member from moving in the winding pancake direction, and the reverse movement prevention mechanism cannot release the reverse movement prevention function from the outside of the housing. The ink ribbon cassette according to the first invention, characterized in that it is present.

The fifth invention is the ink ribbon cassette according to any one of the first invention, the second invention, or the fourth invention, which is characterized in that a plurality of the moving members are provided.

The sixth invention according to any one of the first invention, the second invention, the fourth invention, or the fifth invention, characterized in having an elastic member for pressing the moving member in the winding pancake direction. It is a set.

The seventh invention is the ink ribbon cutter according to any one of the first invention, the second invention, the fourth invention, the fifth invention, or the sixth invention, wherein the moving member is rotatably held around a fulcrum. It is a set.

Eighth invention is described in any one of the first invention, the second invention, the fourth invention, the fifth invention, or the sixth invention, wherein the moving member can move in parallel in the housing. It is an ink ribbon cassette.

The ninth invention is the ink ribbon cassette according to any one of the first invention and the third invention, which has an elastic member for pressing the rotating member against the unwound pancake.

The tenth invention is the ink ribbon cassette according to any one of the first invention, the third invention, or the ninth invention, wherein the plurality of rotating members are provided.

According to the present invention, a moving member that moves as the outer diameter of the pancake is increased to a position in contact with the outer peripheral portion of the pancake in the ink ribbon cassette housing, and / or an outer peripheral portion of the unrolled pancake. It has a rotating member that moves as the outer diameter of the unwound pancake decreases at the contact position, and the moving member moves as the outer diameter of the unwound pancake increases, and the moving member engages with the case and cover. As the outer diameter of the unwound pancake is reduced, the rotating member rotates and the rotating member engages with the case and the cover, and the case and the cover become inseparable. Therefore, when the initial ink ribbon is not used, the moving member is not engaged with the case and the cover and can be disassembled, whereas after using the ink ribbon, the moving member is engaged with the case and the cover. In addition, the case and cover become inseparable. As described above, according to the present invention, it is possible to provide an ink ribbon cassette that can be disassembled before use but cannot be easily disassembled after the ink ribbon cassette has been used.

Top view seen from the cover A1 side of the ink ribbon cassette A according to the first embodiment of the present invention. In order to show the internal structure of the ink ribbon cassette A according to the first embodiment of the present invention, a plan view of the ink ribbon cassette A with the cover A1 removed from the mounting side of the cover A1 (state before use of the ink ribbon cassette A). It is a figure showing a state where the outer diameter of the rolled pancake is small.) A cross-sectional view taken along the line XX of FIG. 2, where the cover A1 is attached. In order to show the internal structure of the ink ribbon cassette A according to the first embodiment of the present invention, a plan view of the ink ribbon cassette A with the cover A1 removed from the mounting side of the cover A1 (state after use of the ink ribbon cassette A). It is a figure showing a state in which the outer diameter of the rolled pancake is increased.) FIG. 4 is a cross-sectional view taken along the line YY, but shows a state in which the cover A1 is attached. Top view seen from the cover B1 side of the ink ribbon cassette B according to the second embodiment of the present invention. In order to show the internal structure of the ink ribbon cassette B according to the second embodiment of the present invention, a plan view of the ink ribbon cassette B with the cover B1 removed from the mounting side of the cover B1 (in the state before the use of the ink ribbon cassette B). Yes, it is a diagram showing a state where the outer diameter of the rolled pancake is small.) A cross-sectional view taken along the line XX of FIG. 7, however, shows a state in which the cover B1 is attached. In order to show the internal structure of the ink ribbon cassette B according to the second embodiment of the present invention, a plan view of the ink ribbon cassette B with the cover B1 removed from the mounting side of the cover B1 (state after use of the ink ribbon cassette B). It is a figure showing a state in which the outer diameter of the rolled pancake is increased.) FIG. 9 is a cross-sectional view taken along the line YY, but shows a state in which the cover B1 is attached. Plan view from the cover C1 side of the conventional ink ribbon cassette C In order to show the internal structure of the conventional ink ribbon cassette C, a plan view of the state where the cover C1 is removed as seen from the mounting side of the cover C1 (the state before the use of the ink ribbon cassette C, and the outer diameter of the take-up pancake is large. It is a figure which shows a small state.) 12 is a cross-sectional view taken along the line ZZ of FIG. 12 (provided that the cover C1 is attached) and an enlarged view of a pin fitting portion. Top view seen from the cover D1 side of the ink ribbon cassette D in which only the conventional method of joining the case and cover of the ink ribbon cassette C is changed to hooking. It is an enlarged view of the ZZ cross section of FIG. 14 and the hook portion. Top view seen from the cover E1 side of the ink ribbon cassette E according to the third embodiment of the present invention. In order to show the internal structure of the ink ribbon cassette E according to the third embodiment of the present invention, a plan view of the ink ribbon cassette E with the cover E1 removed from the mounting side of the cover E1 (state before use of the ink ribbon cassette E). It is a figure showing a state in which the outer diameter of the unwound pancake is large.) FIG. 7 is a cross-sectional view taken along the line XX, but shows a state in which the cover E1 is attached. In order to show the internal structure of the ink ribbon cassette E according to the third embodiment of the present invention, a plan view of the ink ribbon cassette E with the cover E1 removed from the mounting side of the cover E1 (state after use of the ink ribbon cassette E). It is a figure showing a state in which the outer diameter of the unwound pancake is reduced.) FIG. 19 is a cross-sectional view taken along the line YY, but shows a state in which the cover E1 is attached. In order to show the internal structure of the ink ribbon cassette F according to the fourth embodiment of the present invention, a plan view (ink ribbon cassette F) of the ink ribbon cassette F in a state where the cover F1 (not shown) is removed is viewed from the mounting side of the cover F1. It is a state before use, and is a figure showing a state in which the outer diameter of the unwound pancake is large.) In order to show the internal structure of the ink ribbon cassette F according to the fourth embodiment of the present invention, a plan view of the ink ribbon cassette F with the cover F1 removed from the mounting side of the cover F1 (state after use of the ink ribbon cassette F). It is a figure showing a state in which the outer diameter of the unwound pancake is reduced.)

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 the cover A1 of the ink ribbon cassette A according to the first embodiment of the present invention. FIG. 2 is a plan view (of the ink ribbon cassette A) of the ink ribbon cassette A with the cover A1 removed from the mounting side of the cover A1 in order to show the internal structure of the ink ribbon cassette A according to the first embodiment of the present invention. It is a state before use and shows a state where the outer diameter of the rolled pancake is small). FIG. 3 is a cross-sectional view taken along the line XX of FIG. However, it shows a state in which the cover A1 is attached.

In the ink ribbon cassette A of FIG. 1, as shown in FIGS. 2 and 3, the ink ribbon A5 is wound around the unwinding core A3 in a pancake shape inside a hollow housing composed of the case A2 and the cover A1. A winding core A4 for winding the unwound pancake and the ink ribbon A5 unwound from the unwound pancake is rotatably provided. Further, the ink ribbon cassette A is formed with a space A10 into which a print head (not shown) of the printer enters when the printer is attached to the printer.

A plurality of fitting pins A15 (not shown) are provided on the surface of the cover A1 to be engaged and fixed to the case A2. The case A2 is provided with a plurality of fitting holes A25 at positions corresponding to the fitting pins A15 of the cover A1. The outer diameter dimension of the fitting pin A15 and the inner diameter dimension of the fitting hole A25 are set so that the insertion of the fitting pin A15 into the fitting hole A25 is press-fitted. Therefore, the case A2 and the cover A1 are engaged and fixed by press-fitting the fitting pin A15 into the corresponding fitting hole A25. The larger the fitting force between the fitting hole A25 and the fitting pin A15, the more preferable it is in that the case A2 and the cover A1 are firmly joined. However, if the fitting force is too large, the fitting pin A15 may be insufficiently press-fitted into the fitting hole A25, and a press-fitting defect may occur in which a gap is generated at the joint portion between the case A2 and the cover A1. Further, the case A2 and the cover A1 are generally made of a plastic molded product, and if the fitting force becomes too large when such a plastic molded product is used, the appearance of the case A2 and the cover A1 at the time of press-fitting. Whitening defects are likely to occur. In order to prevent such a problem, the fitting force of the fitting hole A25 and the fitting pin A15 is usually such that the case A2 and the cover A1 can be separated by inserting a thin spatula-shaped tool between the case A2 and the cover A1. It is set to about (about 20N to 50N).

As shown in FIGS. 2 and 4, the ink ribbon cassette A further includes a moving member A6. The moving member A6 is rotatably held in the housing around a fulcrum A13 in the housing composed of the case A2 and / or the cover A1, and the ink ribbon A5 after being used for printing is wound around the winding core A4. It is provided at a position where it comes into contact with the outer peripheral portion of the rolled pancake. Further, the moving member A6 can move around the fulcrum A13 as the outer diameter of the pancake is changed in a state of being in contact with the pancake. 4 and 5 are a state after using the ink ribbon cassette A, and are views showing a state in which the outer diameter of the rolled pancake is large.

As shown in FIG. 5, in the state after the ink ribbon cassette A is used, the moving member A6 sandwiches the convex portion A11 composed of the cover A1 and the case A2 (the moving member A6 is engaged with the convex portion A11). ). The moving member A6 has a movement prevention shape A61, which is a portion for preventing the cover side shape A111, which is a shape composed of the cover A1 of the convex portion A11, from moving to the cover A1 side, and a case A2 of the convex portion A11. The case-side shape A112, which is a configured shape, has at least a movement-preventing shape A62, which is a portion that prevents the case-side shape A112 from moving to the case A2 side. When the moving member A6 is moved by being pushed by the outer peripheral portion of the winding pancake due to the increase in the outer diameter of the winding pancake, the movement prevention shape A61 covers the cover A1 side of the cover side shape A111 to prevent movement. The moving member A6 and the convex portion A11 are engaged with each other by the shape A62 covering the case A2 side of the case side shape A112. The cover-side shape A111 is a shape integrated with the cover A1, and the case-side shape A112 is a shape integrated with the case A2. Therefore, even if the moving member A6 is in a state of sandwiching the convex portion A11 and the cover A1 is to be separated from the case A2, the cover side shape A111 integrated with the cover A1 is covered with the movement prevention shape A61, so that the cover is covered. The case side shape A112, which cannot be moved to the A1 side and is also integrated with the case A2, cannot be moved to the case A2 side because it is covered with the movement prevention shape A62, and the cover A1 can be separated from the case A2. It disappears.

The shape of the portion of the moving member A6 including the movement prevention shape A61 and the movement prevention shape A62 that engages with the convex portion A11 is preferably an integrated tubular shape. When the moving member A6 and the convex portion A11 are engaged with each other, it is preferable that the convex portion A11 is inserted into the integrated tubular shape. Since the part that engages with the convex portion A11 is a tubular shape, the mechanical strength of the movement prevention shapes A61 and A62 is increased, and the movement prevention shapes A61 and A62 are deformed or damaged by an external force. It becomes difficult. Therefore, even if the cover-side shape A111 of the convex portion A11 strongly presses the movement-preventing shape A61 of the moving member A6 in an attempt to separate the cover A1 from the case A2, the movement-preventing shape A61 is not deformed or damaged. .. Similarly, even if the case-side shape A112 of the convex portion A11 strongly pushes the movement prevention shape A62 of the movement member A6, the movement prevention shape A62 is not deformed or damaged. Therefore, by making the shape of the portion of the moving member A6 that engages with the convex portion A11 into an integrated tubular shape, it becomes impossible to more reliably separate the cover A1 from the case A2.

When the moving member A6 moves due to the increase in the outer diameter of the take-up pancake, the moving member A6 and the convex portion A11 interfere with each other, the moving member A6 cannot move, and the moving member A6 and the convex portion A11 engage with each other. If it cannot be done, it is preferable that the gap between the cover side shape A111 and the movement prevention shape A61 and the gap between the case side shape A112 and the movement prevention shape A62 in the state where the moving member A6 and the convex portion A11 are engaged is small. This gap is preferably 2 mm or less, more preferably 1 mm or less. Further, in order to prevent the moving member A6 and the convex portion A11 from interfering with each other, the gap is inclined on the inner wall of the moving member A6, which is a portion where the moving member A6 moves and begins to engage with the convex portion A11. A wide shape (so-called call-in shape or C-plane) may be provided.

When the outer diameter of the pancake is large, the pancake becomes an obstacle and the moving member A6 cannot be moved toward the pancake. Therefore, the state in which the moving member A6 sandwiches the convex portion A11 cannot be released. Therefore, in the state of FIGS. 4 and 5, the ink ribbon cassette A cannot easily separate the cover A1 from the case A2. Therefore, the ink ribbon cassette A is an ink ribbon cassette that cannot be easily disassembled when the ink ribbon has been used up.

On the other hand, FIG. 2 is a plan view of the cover A1 removed from the mounting side of the cover A1 in order to show the internal structure of the ink ribbon cassette A according to the first embodiment of the present invention, which is the same as that of FIG. However, it is a state before the use of the ink ribbon cassette A, and is a figure showing a state where the outer diameter of the rolled pancake is small. FIG. 3 is a cross-sectional view taken along the line XX of FIG. In the states of FIGS. 2 and 3, the outer diameter of the take-up pancake of the ink ribbon cassette A is small. Therefore, the moving member A6 can move in the winding pancake direction from the state in which the convex portion A11 is sandwiched, and can move to a position where the convex portion A11 is not sandwiched. Therefore, for example, when the ink ribbon cassette A is placed so that the take-up pancake is on the lower side in the direction of gravity with respect to the convex portion 11, the moving member A6 rotates around the fulcrum A13 due to its own weight, and the take-up pan Move to the position where it touches the cake. In this state, as shown in FIG. 2, the moving member A6 does not sandwich the convex portion A11. Therefore, in the state of FIG. 2, the ink ribbon cassette A can easily separate the cover A1 from the case A2. Therefore, the ink ribbon cassette A is an ink ribbon cassette that can be easily disassembled before using the ink ribbon.

It is preferable that the ink ribbon cassette A according to the first embodiment of the present invention further has a first reversal prevention mechanism for preventing the winding core A4 from rotating in the direction opposite to the winding direction of the ink ribbon A5. Further, it is preferable that the reverse rotation prevention function of the first reverse rotation prevention mechanism cannot be released from the outside of the ink ribbon cassette A. The ink ribbon cassette A has a first reverse rotation prevention mechanism of the take-up core A4 whose reverse rotation prevention function cannot be released from the outside, so that the ink ribbon A5 in the space A10 is pulled and the take-up pan wound around the take-up core A4. The outer diameter of the cake cannot be reduced. As a result, even when the moving member A6 is in a state of sandwiching the convex portion A11 composed of the cover A1 and the case A2 as shown in FIG. 5, the outer diameter of the winding pancake cannot be reduced. It becomes difficult to release the state in which the moving member A6 sandwiches the convex portion A11, and it becomes more difficult to disassemble the ink ribbon cassette A by removing the cover A1 from the case A2.

Further, the ink ribbon cassette A according to the first embodiment of the present invention has a structure in which the winding core A4 cannot be removed from the ink ribbon cassette A unless the cover A1 is removed from the case A2, similarly to the ink ribbon cassette A of the same type. be. Since the take-up core A4 cannot be removed from the ink ribbon cassette A, the state in which the moving member A6 sandwiches the convex portion A11 cannot be released by removing the take-up pancake from the ink ribbon cassette A, and the cover A1 from the case A2 cannot be released. The ink ribbon cassette A cannot be disassembled by removing.

The first reversal prevention mechanism for preventing the reversal of the take-up core A4 is an arbitrary first reversal prevention mechanism as long as it does not cause a large load on the rotation of the take-up core A4 and cause a problem in printing by the ink ribbon cassette A. Can be used. For example, as shown in FIG. 2, a reverse rotation prevention mechanism composed of a reverse rotation prevention gear A41 provided on the outer periphery of the winding core A4 and a ratchet claw A21 provided on the case A2 can be used. In the reverse rotation prevention mechanism of FIG. 2, when the winding core A4 is mounted on the case A2, the winding core A4 is rotatably held by the mounting shaft A22 provided on the case A2 as shown in FIG. When the take-up core A4 is mounted on the mount shaft A22, the reverse rotation prevention gear A41 is continuously provided over the entire circumference of the take-up core A4 at the portion where the ratchet claw A21 contacts. Further, the ratchet claw A21 is provided at the tip of the elastic piece A211 which can be elastic. When the take-up core A4 is attached to the case A2, the ratchet claw A21 meshes with the reverse rotation prevention gear A41. As shown in the enlarged portion of FIG. 2, the shapes of the ratchet claw A21 and the reverse rotation prevention gear A41 are different from those of the ratchet claw A21 when the winding core A4 rotates in the direction opposite to the winding direction of the ink ribbon A5. The gear A41 meshes strongly to prevent the take-up core A4 from rotating. On the other hand, when the take-up core A4 rotates in the direction of winding the ink ribbon A5, the ratchet claw A21 is deformed while the slope of the ratchet claw A21 slides along the slope of the reverse rotation prevention gear A41. The A21 can get over the reverse rotation prevention gear A41. Therefore, the take-up core A4 can rotate in the direction in which the ink ribbon A5 is taken up, but cannot rotate in the direction opposite to the direction in which the ink ribbon A5 is taken up.

The case A2 near the ratchet claw A21 of the ink ribbon cassette A has no opening as shown in the enlarged portion of FIG. 2, and the ratchet claw A21 is in a position covered by the outer wall of the case A2, so that the case A2 is destroyed. Without it, the meshing between the ratchet claw A21 and the reverse rotation prevention gear A41 cannot be released. Further, the take-up core A4 is mounted on the mounting shaft A12 of the cover A1 at the other end in the same manner as it is mounted on the mounting shaft A22 of the case A2. The winding core A4 is rotatably held by the mounting shaft A12 and the mounting shaft A22 on the inner circumferences near both ends. Therefore, the take-up core A4 cannot be removed from the ink ribbon cassette A unless the cover A1 is removed from the case A2.

As described above, in the ink ribbon cassette A, the take-up core A4 cannot be removed from the ink ribbon cassette A unless the cover A1 is removed from the case A2. Further, the take-up core A4 cannot rotate in the direction opposite to the direction in which the ink ribbon A5 is taken up by the first reverse rotation prevention mechanism composed of the ratchet claw A21 and the reverse rotation prevention gear A41, and the take-up core A4 cannot be rotated. The ink ribbon A5 wound around the A4 cannot be pulled out to reduce the outer diameter of the wound pancake. Further, since the ratchet claw A21 is covered with the outer wall of the case A2, the reverse rotation prevention of the take-up core A4 cannot be released unless the case A2 is destroyed. As a result, in the winding core A4 of the ink ribbon cassette A, the winding core A4 is removed from the ink ribbon cassette A in a state where the moving member A6 sandwiches the convex portion A11 composed of the cover A1 and the case A2 as shown in FIG. In addition, the outer diameter of the winding pancake wound around the winding core A4 cannot be reduced. Therefore, in a state where the moving member A6 sandwiches the convex portion A11 composed of the cover A1 and the case A2, the cover A1 can be removed from the case A2 unless at least one of the case A2 and the cover A1 is destroyed. The cover A1 cannot be removed from the case A2 in a state where both the case A2 and the cover A1 can be reused.

FIG. 6 is a plan view seen from the cover B1 of the ink ribbon cassette B according to the second embodiment of the present invention. FIG. 7 is a plan view (of the ink ribbon cassette B) of the ink ribbon cassette B with the cover B1 removed from the mounting side of the cover B1 in order to show the internal structure of the ink ribbon cassette B according to the second embodiment of the present invention. It is a state before use and shows a state where the outer diameter of the rolled pancake is small). FIG. 8 is a cross-sectional view taken along the line XX of FIG. However, it shows a state in which the cover B1 is attached. FIG. 9 is a plan view of the ink ribbon cassette B with the cover B1 removed as in FIG. 7 as seen from the cover B1 mounting side and an enlarged view of the reverse movement prevention mechanism. It is a figure which shows the state which the outer diameter of a rolled pancake is large. FIG. 10 is a cross-sectional view taken along the line YY of FIG. However, it shows a state in which the cover B1 is attached.

The difference between the ink ribbon cassette B and the ink ribbon cassette A is that, as shown in FIGS. 7 and 9, convex portions B11 between the moving member B6 and the moving member B6 are provided at two locations, and the moving member A6 is a fulcrum A13. The moving member B6 moves in parallel in the ink ribbon cassette B, and the moving member B6 is used as the winding pancake instead of the first reverse rotation prevention mechanism of the winding core. A reverse movement prevention mechanism for preventing movement in the approaching direction is provided, an elastic member B14 for pressing the moving member B6 in the winding pancake direction is provided, and immediately before the winding core B4. A direction changing pin B24 for changing the traveling direction of the ink ribbon B5 is provided.

In the ink ribbon cassette B, as shown in FIG. 7, the moving members B6 are provided at two facing locations. Therefore, when the moving member B6 moves due to the increase in the outer diameter of the take-up pancake, the moving members B6 are provided at the two facing locations. The moving member B6 is in a state of sandwiching (engaging) the convex portion B11. Therefore, it becomes more difficult to separate the cover B1 from the case B2 than the ribbon cassette A. By providing the plurality of moving members B6 in this way, it becomes more difficult to separate the cover B1 from the case B2 in the state after use of the ink ribbon cassette B having a large outer diameter of the take-up pancake. It is preferable that a plurality of convex B11s that engage with the B6 and the moving member B6 are provided.

As shown in FIGS. 8 and 10, in the ink ribbon cassette B, the moving member B6 comes into contact with the outer periphery of the winding pancake so that the moving member B6 can move in a direction away from the winding pancake. A rail portion B15 is provided to hold both end portions so that they can be slidably moved. Further, the moving member B6 has a ratchet claw B61 which is an integrally formed structure. The reverse movement prevention gear B23 that meshes with the ratchet claw B61 is continuously provided in the case B2 at a position where it meshes with the ratchet claw B61. That is, the ratchet claw B61 and the reverse movement prevention gear B23 constitute a reverse movement prevention mechanism that prevents the moving member B6 from moving in the direction approaching the take-up pancake.

In the ink ribbon cassette B, when the moving member B6 is attached to the case B2, the moving member B6 is set between the two rails of the rail portion B15 provided on the case B2, and moves by attaching the cover B1 to the case B2. Both ends of the member B6 are sandwiched between the rail portion B15 provided on the case B2 and the rail portion B15 provided on the cover B1, and are movably held in the ink ribbon cassette B. When the moving member B6 is attached to the case B2 and moved in a direction away from the winding pancake, the ratchet claw B61 is moved in the reverse direction due to the elastic deformation of the elastic piece B611 provided at the tip of the ratchet claw B61. While sliding on the slope of the prevention gear B23, the ratchet claw B61 meshes with the next reverse movement prevention gear B23 by overcoming this slope. Since the ratchet claw B61 is pressed against the reverse movement prevention gear B23 by the elastic force of the elastic piece B611, the ratchet claw B61 and the reverse movement prevention gear B23 can be firmly meshed with each other. In the ink ribbon cassette B, the reverse movement prevention gear B23 that meshes with the ratchet claw B61 is provided not only when the moving member B6 moves to the position where the convex portion B11 is sandwiched but also when the convex portion B11 is not sandwiched. The reverse movement prevention gear B23 that continuously meshes with the ratchet claw B61 may be provided only at the position where the convex portion B11 is sandwiched.

As shown in the enlarged portion of FIG. 9, the shapes of the ratchet claw B61 and the reverse movement prevention gear B23 are the ratchet claw B61 and the reverse movement prevention gear B23 when the moving member B6 moves in the direction approaching the take-up pancake. Engage strongly and prevent the moving member B6 from moving. On the other hand, when the moving member B6 moves away from the take-up pancake, the ratchet claw B61 is deformed while the slope of the ratchet claw B61 slides along the slope of the reverse movement prevention gear B23, so that the ratchet claw is deformed. The B61 can get over the reverse movement prevention gear B23. Therefore, the moving member B6 can move in the direction away from the take-up pancake, but cannot move in the direction toward the take-up pancake.

As shown in FIGS. 7 and 9, the case B2 near the ratchet claw B61 of the ink ribbon cassette B has no opening, and the ratchet claw B61 is covered with the outer wall of the case B2, so that the case B2 must be destroyed. , The meshing between the ratchet claw B61 and the reverse movement prevention gear B23 cannot be released. Further, since the moving member B6 is provided with a reverse movement prevention mechanism, even if the outer diameter of the take-up pancake is reduced, the moving member B6 cannot be moved in the direction of the take-up pancake, and the convex portion. The engagement between B11 and the moving member B6 cannot be disengaged.

In the ink ribbon cassette B, it is preferable to provide an elastic member B14 that presses the moving member B6 in the winding pancake direction. The range in which the elastic member B14 presses the moving member B6 is preferably a position on the winding pancake side of 1 to 5 mm rather than the position where the moving member B6 sandwiches the convex portion B11. In the ink ribbon cassette B, the ratchet claw B61 and the reverse movement prevention gear B23 mesh with each other to prevent the moving member B6 from moving toward the take-up pancake side. However, the moving member B6 can move relatively easily in the direction away from the rolled pancake.

In this way, when the moving member B6 is in a state where it can be moved relatively easily, for example, when vibration or the like is applied during the transportation of the ink ribbon cassette B, the moving member B6 moves due to the vibration and is convex. The moving member B6 may move to a position where the portion B11 and the moving member B6 engage. As described above, if the moving member B6 is in a state where it can be moved relatively easily, the moving member B6 sandwiches the convex portion B11 due to vibration or the like even in the pre-use situation where the ink ribbon B5 is not used. Therefore, the ink ribbon cassette B may not be disassembled. If the reverse movement prevention mechanism is provided, the state in which the moving member B6 sandwiches the convex portion B11 cannot be released unless the ink ribbon cassette B is disassembled. This makes it impossible to provide an ink ribbon cassette that can be disassembled in a state before use, which is a subject of the present invention, but cannot be easily disassembled in a state where the ink ribbon cassette has been used up.

On the other hand, the elastic member B14 that presses the moving member B6 in the winding pancake direction is provided, and the range in which the elastic member B14 presses the moving member B6 is 1 than the position where the moving member B6 sandwiches the convex portion B11. If the position is up to the winding pancake side by 5 mm, even if the moving member B6 moves away from the winding pancake due to vibration or the like, the moving member B6 will not move to the position where the convex portion B11 is sandwiched. not. Therefore, by providing the elastic member B14, the moving member B6 does not sandwich the convex portion B11 for reasons other than being pressed against the outer peripheral portion of the take-up pancake, and the ink ribbon B5 is not used. In the previous state, the moving member B6 does not sandwich the convex portion B11 and the ink ribbon cassette B cannot be disassembled.

FIG. 16 is a plan view of the cover E1 of the ink ribbon cassette E according to the third embodiment of the present invention. FIG. 17 is a plan view (of the ink ribbon cassette E) of the ink ribbon cassette E with the cover E1 removed from the mounting side of the cover E1 in order to show the internal structure of the ink ribbon cassette E according to the third embodiment of the present invention. It is a state before use and shows a state where the outer diameter of the rolled pancake is small). FIG. 18 is a cross-sectional view taken along the line XX of FIG. However, it shows a state in which the cover E1 is attached. FIG. 19 is a plan view of the ink ribbon cassette E with the cover E1 removed as in FIG. 17 as viewed from the mounting side of the cover E1. Is a diagram showing a large state. FIG. 20 is a cross-sectional view taken along the line YY of FIG. However, it shows a state in which the cover E1 is attached.

The difference between the ink ribbon cassette E and the ink ribbon cassette A and the ink ribbon cassette B is that, as shown in FIGS. 17 and 19, the unrolled pancake is not a moving member that moves as the outer diameter of the rolled pancake increases. A rotating member E7 is provided at a position where it comes into contact with the outer peripheral portion and moves as the outer diameter of the unwound pancake decreases. The rotating member E7 is rotatably supported by the case E2 by mounting the rotating hole E71 provided in the rotating member E7 on the support shaft E14 provided in the case E2. The rotating member E7 has a pressing portion E72 and an engaging portion E73 at the positions of both ends of the rotating hole E71. The pressing portion E72 is a portion that presses the outer periphery of the unwound pancake by being pressed by the elastic member E8, and the engaging portion E73 sandwiches the convex portion E11 composed of the cover E1 and the case E2 to cover the cover E1. And case E2 are inseparable parts.

In the ink ribbon cassette E, the pressing portion E72 is pressed against the outer peripheral portion of the unwound pancake by the coil spring which is the elastic member E8. Since the pressing portion E72 is pressed against the outer peripheral portion of the unrolled pancake, the ink ribbon E5 is unwound from the unrolled pancake and the outer diameter of the unwound pancake decreases, so that the rotating member E7 Rotates around the support shaft E14. Since the rotating member E7 rotates as the outer diameter of the unwound pancake decreases, the state before using the ink ribbon E5 shown in FIG. 17 is changed to the state after using the ink ribbon E5 shown in FIG. , The state in which the pressing portion E72 is in contact with the outer peripheral portion of the unwound pancake is maintained.
In the ink ribbon cassette E, a metal coil spring is used as the elastic member E8, but the elastic member E8 is not limited to the coil spring, and may be a leaf spring made of metal, resin, or the like. Further, in the ink ribbon cassette E, the elastic member E8 is a separate member from the rotating member E7 and the case E2, but the elastic member E8 does not necessarily have to be a separate member from the rotating member E7 and the case E2. It may be a resin spring integrally molded with the rotating member E7 or the case E2.

The portion of the pressing portion E72 that comes into contact with the unwound pancake preferably has a small coefficient of friction and is soft. For example, it is preferable to use a sheet-shaped urethane foam or felt to which a sheet having a coating surface having a small friction coefficient such as fluorine-based or silicone-based is attached. In the ink ribbon cassette E, a felt having a thickness of 2 mm was attached to the pressing portion E72 with a double-sided adhesive tape, and a polytetrafluoroethylene sheet was attached onto the felt with a silicone adhesive. Since the contact surface of the pressing portion E72 with the unrolled pancake is a polytetrafluoroethylene sheet having a small friction coefficient, the braking force acting on the unrolled pancake when the pressing portion E72 is pressed is minimized. Can be done. Further, the coefficient of friction of the contact surface of the pressing portion E72 with the unrolled pancake is reduced, and the pressing force acting on the contact surface of the pressing portion E72 with the unrolled pancake is alleviated by the deformation of the felt. It is possible to prevent damage such as scratches on the surface of the unrolled pancake that comes into contact with the pressing portion E72.

When the rotating member E7 rotates about the support shaft E14 as the outer diameter of the unwound pancake decreases, the engaging portion E73 moves from the position shown in FIG. 17 to the position shown in FIG. Engage with the protrusion E11. The relationship between the engaging portion E73 and the convex portion E11 is the same as the relationship between the moving member A6 and the convex portion A11 of the ink ribbon cassette A according to the first embodiment of the present invention.

As shown in FIG. 19, in the state after the ink ribbon cassette E is used, the engaging portion E73 sandwiches the convex portion E11 composed of the cover E1 and the case E2 (the rotating member E7 engages with the convex portion E11). It is in the state of being). As shown in the partially enlarged view of FIG. 20, the engaging portion E73 is a portion that prevents the cover-side shape E111, which is a shape formed by the cover E1 of the convex portion E11, from moving to the cover E1 side. The case-side shape E112, which is a shape composed of the prevention shape E731 and the case E2 of the convex portion E11, has at least a movement prevention shape E732 which is a portion for preventing the case-side shape E112 from moving to the case E2 side. When the pressing portion E72 that presses the outer peripheral portion of the unrolled pancake moves due to the decrease in the outer diameter of the unrolled pancake, the engaging portion E73 also moves from FIG. 17 to the position shown in FIG. Engage. When the engaging portion E73 engages with the convex portion E11, the movement prevention shape E731 covers the cover E1 side of the cover side shape E111, and the movement prevention shape E732 covers the case E2 side of the case side shape E112. E73 and the convex portion E11 engage with each other. The cover-side shape E111 is a shape integrated with the cover E1, and the case-side shape E112 is a shape integrated with the case E2. Therefore, even if the cover E1 is to be separated from the case E2 while the engaging portion E73 of the rotating member E7 sandwiches the convex portion E11, the cover side shape E111 integrated with the cover E1 has a movement prevention shape E731. Since it is covered, it cannot be moved to the cover E1 side. Similarly, the case side shape E112 integrated with the case E2 cannot be moved to the case E2 side because it is covered with the movement prevention shape E732, and the cover from the case E2. Separation of E1 can be prevented.

It is preferable that the shape of the portion of the rotating member E7 including the movement prevention shape E731 and the movement prevention shape E732 that engages with the convex portion E11 of the engaging portion E73 is an integrated tubular shape. This is the same as the moving member A6 of the set A and the moving member B6 of the ink ribbon cassette B. By forming the shape of the portion of the rotating member E7 that engages with the convex portion E11 of the engaging portion E73 into an integrated tubular shape, it is possible to more reliably prevent the cover E1 from being separated from the case E2. can.

When the engaging portion E73 of the rotating member E7 moves due to the smaller outer diameter of the unwinding pancake, the engaging portion E73 and the convex portion E11 interfere with each other, and the rotating member E7 cannot move and rotates. If the engaging portion E73 and the convex portion E11 of the member E7 cannot be engaged with each other, the cover side shape E111 and the movement prevention shape E731 in the state where the engaging portion E73 and the convex portion E11 are engaged, and the case side shape E112 Similar to the ink ribbon cassette A and the ink ribbon cassette B, the gap between the movement prevention shape E732 and the movement prevention shape E732 is preferably small. This gap is preferably 2 mm or less, more preferably 1 mm or less. Further, in order to prevent the engaging portion E73 and the convex portion E11 from interfering with each other, the gap is formed in the inner wall of the engaging portion E73, which is a portion where the engaging portion E73 moves and begins to engage with the convex portion E11. Similar to the ink ribbon cassettes A and B, a shape that widens in an inclined shape (so-called calling shape or C surface) may be provided.

Even when the outer diameter of the unwound pancake is small, the pressing portion E72 of the rotating member E7 is pressed by the elastic member E8 against the unwound pancake, and the vicinity of the rotating member E7 of the ink ribbon cassette E. Since the cover E1 and the case E2 are not provided with holes in which the rotating member E7 can be operated from the outside, the rotating member E7 cannot be moved. Therefore, the state in which the engaging portion E73 of the rotating member E7 sandwiches the convex portion E11 cannot be released. Therefore, in the state of FIG. 19, the ink ribbon cassette E cannot easily separate the cover E1 from the case E2. Therefore, the ink ribbon cassette E becomes an ink ribbon cassette that cannot be easily disassembled when the ink ribbon has been used up.

On the other hand, FIG. 17 is a plan view of the state in which the cover E1 is removed as seen from the mounting side of the cover E1 in order to show the internal structure of the ink ribbon cassette E according to the third embodiment of the present invention, which is the same as in FIG. However, it is a state before the use of the ink ribbon cassette E, and is a figure showing a state in which the outer diameter of the unwound pancake is large. FIG. 18 is a cross-sectional view taken along the line XX of FIG. In the states of FIGS. 17 and 18, the outer diameter of the unwound pancake of the ink ribbon cassette E is large. Therefore, the rotating member E7 does not sandwich the convex portion E11. Therefore, in the state of FIG. 17, the ink ribbon cassette E can easily separate the cover E1 from the case E2. Therefore, the ink ribbon cassette E is an ink ribbon cassette that can be easily disassembled before using the ink ribbon E5.

Further, in the ink ribbon cassette E, the unwinding core E3 is rotated in the direction opposite to the unwinding direction of the ink ribbon E5, and the ink ribbon E5 unwound from the unwinding core E3 is rewound to the unwinding core E3 again. It is preferable not to let it. As such a method, a reverse rotation prevention mechanism is provided to prevent the unwinding core E3 from coming into contact with the outside, or to prevent the ink ribbon E5 of the unwinding core E3 from rotating in the direction opposite to the unwinding direction. There is a way. Any reverse rotation prevention mechanism can be used as long as the reverse rotation prevention mechanism causes a large load on the rotation of the unwinding core E3 and does not cause a problem in printing by the ink ribbon cassette E. In the ink ribbon cassette E, as shown in the partially enlarged view of FIG. 19, as a reverse rotation prevention mechanism for preventing the reverse rotation of the unwinding core E3, the reverse rotation prevention gear E41 and the case E2 provided on the outer periphery of the unwinding core E3 are provided. A second reverse rotation prevention mechanism composed of the ratchet claw E21 can be used. In the second reverse rotation prevention mechanism of FIG. 19, when the unwinding core E3 is mounted on the case E2, the unwinding core E3 is rotatably held by the mounting shaft E22 provided on the case E2 as shown in FIG. When the unwinding core E3 is mounted on the mounting shaft E22, the reverse rotation prevention gear E41 is continuously provided over the entire circumference of the unwinding core E3 at the portion where the ratchet claw E21 contacts. Further, the ratchet claw E21 is provided at the tip of the elastic piece E211 which can be elastic. When the unwinding core E3 is attached to the case E2, the ratchet claw E21 meshes with the reverse rotation prevention gear E41. As shown in the enlarged portion of FIG. 19, the shapes of the ratchet claw E21 and the reverse rotation prevention gear E41 are different from those of the ratchet claw E21 when the unwinding core E3 rotates in the direction opposite to the winding direction of the ink ribbon E5. The gear E41 meshes strongly to prevent the unwinding core E3 from rotating. On the other hand, when the unwinding core E3 rotates in the direction in which the ink ribbon E5 is unwound, the ratchet claw E21 is deformed while the slope of the ratchet claw E21 slides along the slope of the reverse rotation prevention gear E41. The E21 can get over the reverse rotation prevention gear E41. Therefore, the unwinding core E3 can rotate in the direction in which the ink ribbon E5 is unwound, but cannot rotate in the direction opposite to the direction in which the ink ribbon E5 is unwound.

As shown in FIG. 19, the case E2 near the ratchet claw E21 of the ink ribbon cassette E has no opening, and the ratchet claw E21 is in a position covered by the outer wall of the case E2. The meshing between the ratchet claw E21 and the reverse rotation prevention gear E41 cannot be released. Further, the unwinding core E3 is mounted on the mounting shaft E12 of the cover E1 at the other end in the same manner as it is mounted on the mounting shaft E22 of the case E2. The unwinding core E3 is rotatably held by the mounting shaft E12 and the mounting shaft E22 on the inner circumferences near both ends. Therefore, the take-up core E4 cannot be removed from the ink ribbon cassette E unless the cover E1 is removed from the case E2.

As described above, in the ink ribbon cassette E, the unwinding core E3 cannot be removed from the ink ribbon cassette E unless the cover E1 is removed from the case E2. Further, the unwinding core E3 cannot rotate in the direction opposite to the unwinding direction of the ink ribbon E5 due to the second reverse rotation prevention mechanism composed of the ratchet claw E21 and the reverse rotation prevention gear E41, and the unwinding core E3 cannot rotate in the opposite direction to the winding direction. The ink ribbon E5 unwound from E3 cannot be rewound to increase the outer diameter of the unwound pancake again. Further, since the ratchet claw E21 is covered with the outer wall of the case E2, the reverse rotation prevention of the unwinding core E3 cannot be released unless the case E2 is destroyed. As a result, the unwinding core E3 of the ink ribbon cassette E is from the ink ribbon cassette E in a state where the engaging portion E73 of the rotating member E7 sandwiches the convex portion E11 composed of the cover E1 and the case E2 as shown in FIG. The unwinding core E3 cannot be removed, nor can the outer diameter of the unwinding pancake wrapped around the unwinding core E3 be increased.

As described above, in the ink ribbon cassette E, when the ink ribbon E5 is used up, the engagement portion E73 of the rotating member E7 and the convex portion E11 cannot be disengaged from the outside, so that the case E2 or the cover The cover E1 cannot be removed from the case E2 unless at least one of the E1s is destroyed, and the cover E1 can be removed from the case E2 in a state where both the case E2 and the cover E1 can be reused. Can not.

Further, as described above, in the ink ribbon cassette E, as a method of preventing the ink ribbon E5 from being rewound to the unwinding core E3, there is also a method of preventing the ink ribbon E3 from coming into contact with the unwinding core E3 from the outside. As a method of preventing the unwinding core E3 from coming into contact with the outside, a method of extending the mounting shaft E12 of the cover E1 and the mounting shaft E22 of the case E2 shown in FIG. 18 to cover the entire inner circumference of the unwinding core E3, etc. There is. When the entire inner circumference of the unwinding core E3 is covered, the inner circumference of the unwinding core E3 cannot be contacted from the outside. Therefore, the unwinding core E3 is rotated from the outside and unwound from the unwinding core E3. The ink ribbon E5 cannot be rewound to the unwinding core E3 again, and the ink ribbon E5 is rewound to the unwinding core E3 again in the same manner as the second reverse rotation prevention mechanism is provided, and the unwinding pancake. The outer diameter cannot be increased.

In the ink ribbon cassette E, the rotating member E7 is provided at one place, but it is preferable to provide the rotating member E7 at two or more places like the moving member B6 of the ink ribbon cassette B. By providing the rotating members E7 at two or more places, when the ribbon is unwound from the unwound pancake and the unwound pancake becomes smaller, the engaging portions E73 of the two rotating members E7 move and 2 The engaging portion E73 is in a state of sandwiching the convex portion E11 at the portion. Therefore, it becomes more difficult to separate the cover E1 from the case E2 than the ribbon cassette E. By providing the plurality of rotating members E7 in this way, it becomes more difficult to separate the cover E1 from the case E2 in the state after use of the ink ribbon cassette E having a smaller unwinding pancake outer diameter. It is preferable that a plurality of convex E11s that engage with the moving member E7 and the rotating member E7 are provided.

FIG. 21 is a plan view (of the ink ribbon cassette F) of the ink ribbon cassette F with the cover F1 removed from the mounting side of the cover F1 in order to show the internal structure of the ink ribbon cassette F according to the fourth embodiment of the present invention. It is a state before use and shows a state where the outer diameter of the rolled pancake is small). FIG. 22 is a plan view of the ink ribbon cassette F in a state where the cover F1 is removed as in FIG. 21 as seen from the mounting side of the cover F1. Is a diagram showing a large state.

The difference between the ink ribbon cassette F and the ink ribbon cassette E is that, as shown in FIGS. 21 and 22, a moving member F6 that moves as the outer diameter of the take-up pancake increases is further provided, and the ink ribbon cassette A and the ink ribbon cassette A are provided. It is to have a reverse rotation prevention mechanism of a similar take-up core.
A reverse rotation prevention gear F41 having the same shape as the reverse rotation prevention gear A41 provided on the ink ribbon cassette A is provided on the outer periphery of the take-up core F4 of the ink ribbon cassette F, and the case F2 of the ink ribbon cassette F is the case A2 of the ink ribbon cassette A. A ratchet claw F21 having the same shape as the ratchet claw A21 provided in the above is provided. In the ink ribbon cassette F, similarly to the ink ribbon cassette A, the ratchet claw F21 engages with the reverse rotation prevention gear F41 to prevent the winding core F4 from rotating in the direction opposite to the direction in which the ink ribbon F5 is wound. There is.

As shown in FIG. 22, in the state after the ink ribbon cassette F is used, both the moving member F6 and the rotating member F7 sandwich (engage) the convex portion F11, so that the case F2 is further than the ink ribbon cassette E. It becomes difficult to separate the cover F1 from the above.

In the above embodiment of the present invention, the ink ribbon cassette is composed of eight types of parts: an ink ribbon, a case, a cover, a winding core, a winding core, a moving member and / or a rotating member, and an elastic member. Depending on the situation, parts other than these may be provided as appropriate.

For example, in order to reduce the running resistance of the ink ribbon, a roller that is in contact with the ink ribbon and rotates with the running of the ink ribbon, an elastic member that is in contact with the ink ribbon and applies tension to the ink ribbon, and the like are provided in the ink ribbon cassette. It may be provided in.

The ink ribbon cassette A of the first embodiment of the present invention is shown in FIGS. 1 to 5. The ink ribbon cassette B of the second embodiment of the present invention is shown in FIGS. 6 to 10. The ink ribbon cassette E of the third embodiment of the present invention is shown in FIGS. 16 to 20. The ink ribbon cassette F of the fourth embodiment of the present invention is shown in FIGS. 21 to 22.

A, B, C, D, E, F: Ink ribbon cassettes A1, B1, C1, D1, E1, F1: Covers A2, B2, C2, D2, E2, F2: Cases A21, B61, E21, F21: Ratchet claws A211, B611, E211: Elastic piece A12, A22, E12, E22: Mounting shaft B23: Reverse movement prevention gear B24: Direction change pin A3, B3, C3, D3, E3, F3: Unwinding core A4, B4, C4, D4, E4, F4: Winding core A41, E41, F41: Reverse rotation prevention gear A5, B5, C5, D5, E5, F5: Ink ribbon A6, B6, F6: Moving member A61: Movement prevention shape (cover of moving member) side)
A62: Movement prevention shape (case side of moving member)
E7: Rotating member E71: Rotating hole E72: Pressing part E73: Engaging part E731: Movement prevention shape (cover side of rotating member)
E732: Movement prevention shape (case side of rotating member)
E8: Elastic members A10, B10, C10, D10, E10: Spaces A11, B11, E11, F11: Convex parts A111, E111: Cover side shape (convex part)
A112, E112: Case side shape (convex part)
A13: Support point E14: Support shaft A15, C15: Fitting pin A25, C25: Fitting hole B14: Elastic member B15: Rail part D15: Hook part

Claims (10)

The unwinding core and the winding core are rotatably held inside a hollow housing consisting of a case and a cover, and the ink ribbon is unwound from the unwinding pancake in which the ink ribbon is wound around the unwinding core. In an ink ribbon cassette in which the ink ribbon is used for printing by winding the ink ribbon with a take core.
A moving member provided on the winding core in the housing at a position in contact with the outer peripheral portion of the winding pancake on which the ink ribbon is wound and moves as the outer diameter of the winding pancake increases, and / Alternatively, it has a rotating member that is provided at a position in contact with the outer peripheral portion of the unwound pancake and moves as the outer diameter of the unwound pancake decreases, so that the outer diameter of the unwound pancake increases. The moving member moves accordingly, and / or the rotating member rotates as the outer diameter of the unwound pancake decreases, and the moving member and / or the rotating member becomes the case and the said. An ink ribbon cassette characterized in that the case and the cover cannot be separated by engaging with the cover. Further having a first reverse rotation prevention mechanism for preventing the winding core from rotating in the direction opposite to the winding direction of the ink ribbon, the winding in a state where the case and the cover according to claim 1 are inseparable. The ink ribbon cassette according to claim 1, wherein the taking pancake cannot be taken out from the housing, and the reverse rotation prevention mechanism cannot be released from the outside of the housing. The unwinding core further has a second reversal prevention mechanism for preventing the ink ribbon from rotating in the direction opposite to the unwinding direction, and the second reversal prevention mechanism can release the reversal prevention function from the outside of the housing. The ink ribbon cassette according to claim 1, wherein the ink ribbon cassette is impossible. It has a reverse movement prevention mechanism that prevents the moving member from moving in the winding pancake direction, and the reverse movement prevention mechanism is characterized in that the reverse movement prevention function cannot be released from the outside of the housing. The ink ribbon cassette according to claim 1. The ink ribbon cassette according to claim 1, claim 2, or claim 4, wherein a plurality of the moving members are provided. The ink ribbon cassette according to claim 1, claim 2, claim 4, or claim 5, further comprising an elastic member that presses the moving member toward the take-up pancake. The ink ribbon cassette according to claim 1, claim 2, claim 4, claim 5, or claim 6, wherein the moving member is rotatably held around a fulcrum. The ink ribbon cassette according to claim 1, claim 2, claim 4, claim 5, or claim 6, wherein the moving member can be translated in the housing. The ink ribbon cassette according to claim 1 or 3, further comprising an elastic member that presses the rotating member against the unwound pancake. The ink ribbon cassette according to claim 1, claim 3, or claim 9, wherein a plurality of the rotating members are provided.

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