JP2019055580A - Ink ribbon cassette for dot impact printer - Google Patents

Abstract

To provide an ink ribbon cassette for a dot impact printer, which is intended to accommodate an endless ink ribbon being a fabric impregnated with ink, and which can suppress occurrence of malfunction caused by conveyance abnormality of the ink ribbon, even when an ink ribbon longer than normal is packed into the ink ribbon cassette.SOLUTION: Provided is an ink ribbon cassette in which: a sheet-like material is adhered to at least one inner wall surface of an ink ribbon storage chamber of the ink ribbon cassette; a dynamic friction coefficient of both surfaces on a surface on a side in contact with the sheet-like ink ribbon is 0.45 or less; and a static contact angle of oleic acid on the surface on the side in contact with the sheet-like ink ribbon is 60° or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an ink ribbon cassette for a dot impact printer that stores an endless ink ribbon in which a fabric is impregnated with ink.

  Dot impact printers have been used extensively in recorders, time card recorders, financial terminals, etc., because of their high operational stability and excellent maintenance, such as the need to replace supplies such as ink ribbon cassettes. Yes.

  Ink ribbon cassettes have long been required to have as long a print life as possible. The size of existing ink ribbon cassettes remains the same, and the length of ink ribbons packed in the ink ribbon cassette is increased to increase the print life. Improvements have been made to reduce the replacement frequency of the ink ribbon cassette. However, in recent years, a longer-life ink ribbon cassette has been demanded, and the length of the ink ribbon loaded in the ink ribbon cassette has become longer. It is coming.

  However, when the length of the ink ribbon to be packed in the ink ribbon cassette is increased, the density of the ink ribbon in the ink ribbon storage chamber inside the ink ribbon cassette increases, and the internal pressure received by the ink ribbon in the ink ribbon storage chamber increases. The ink ribbon can no longer be smoothly transported in the ink ribbon storage chamber, and as a result, the ink ribbon is caught in the feed roll or adhered to the inner wall of the ink ribbon storage chamber. Ink ribbon transport abnormalities may occur due to being pinched by the inner wall, and as a result, problems such as printing stoppage due to uneven printing density, ink ribbon breakage, and feed roll torque abnormality are likely to occur. Became.

  Regarding such a problem, for example, as disclosed in Patent Document 1, a ribbon cassette characterized in that a sheet-like material having low sliding frictional resistance with an ink ribbon is attached to the inner wall of the ribbon cassette.

  However, simply sticking a sheet-like material having low sliding friction resistance to the inner wall of the ribbon cassette may not actually be able to satisfactorily improve the problems caused by abnormal ink ribbon transport.

Published Utility Model Publication No. 1-93466

  The present invention has been made in view of such a situation, and is an ink ribbon cassette for a dot impact printer that houses an endless ink ribbon impregnated with ink in a fabric, and the ink ribbon cassette is longer than usual. An object of the present invention is to provide an ink ribbon cassette capable of suppressing the occurrence of problems due to abnormal ink ribbon transport even when the ink ribbon is packed.

  In order to solve these problems, the present inventor has attached a sheet-like material to at least one inner wall surface of the ink ribbon storage chamber of the ink ribbon cassette, and the surface of the sheet-like material on the side in contact with the ink ribbon Invented an ink ribbon cassette for a dot impact printer having a coefficient of dynamic friction of 0.45 or less and a static contact angle of oleic acid on the surface of the sheet-like material contacting the ink ribbon of 60 ° or more It came to do. With this configuration, even when an ink ribbon longer than usual is packed in the ink ribbon cassette, it is possible to suppress the occurrence of problems due to abnormal transport of the ink ribbon.

  Further, when the sheet-like material is completely immersed in oleic acid at 40 ° C. and stored for 7 days, the dimensional change rate of the sheet-like material before and after storage is −1.0 to 1.0%. By selecting and using a sheet-like material that is within the range, it has become possible to further reduce the occurrence of problems due to abnormal transport of the ink ribbon that is affected by the dimensional change of the sheet-like material.

  Furthermore, the sheet-like material has an adhesive layer, and by forming the pattern of the adhesive layer in a dot shape, the distortion caused by the dimensional change of the sliding sheet while maintaining sufficient adhesive force to the inner wall surface of the ink ribbon cassette. It is possible not to concentrate the influence of the material on a specific place, and to suppress the occurrence of significant wrinkles and deformation in specific parts of the sheet-like material, resulting in the occurrence of wrinkles due to the dimensional change of the sheet-like material This makes it possible to further reduce the occurrence of problems due to abnormal ink ribbon transport.

  By using the ink ribbon cassette for a dot impact printer of the present invention, it is possible to suppress the occurrence of problems due to abnormal ink ribbon transport even if an ink ribbon longer than usual is packed in the ink ribbon cassette. It is possible to suppress the occurrence of problems such as printer stoppage due to unevenness, ink ribbon breakage, and feed roll torque abnormality.

The schematic diagram which shows an example of embodiment of the ink ribbon cassette of this invention. FIG. 4 is a schematic diagram illustrating an example of an abnormal conveyance of an ink ribbon that occurs when a long ink ribbon is loaded into an ink ribbon cassette. The typical sectional view showing an example of the embodiment of the sheet-like material used for the present invention. The typical top view which shows an example of embodiment which looked at the sheet-like material used for this invention from the adhesion layer side.

  FIG. 1 is a schematic view showing an example of an embodiment of an ink ribbon cassette when the lid of the ink ribbon cassette is removed to make it easy to see the state inside the ink ribbon cassette according to the present invention, and viewed from the lid side. By sticking the sheet-like material 8 used in the present invention to the inner wall surface of the ink ribbon storage chamber 7, even if the ink ribbon 2 longer than usual is packed in the ink ribbon cassette 1, it is possible to suppress the occurrence of problems due to abnormal conveyance. . The ink ribbon cassette in the present invention basically has a structure as shown in FIG. 1, and an endless ink ribbon 2 in which a ribbon-like woven fabric is impregnated with ink and the ends thereof are connected to form a loop. Stored inside. The ink ribbon 2 coming out from the ribbon outlet 10 of the ink ribbon cassette 1 is passed between the head of the dot impact printer and the recording paper, and the ink impregnated in the ink ribbon 2 is transferred to the recording paper by the pin hitting by the head. Printing is performed. The ink ribbon 2 used for printing is wound up from the ribbon inlet 3 into the ink ribbon cassette 1. A feed roll 4 is used for winding the ink ribbon 2, and the ink ribbon 2 is fed into the ink ribbon storage chamber 7 surrounded by the partition wall 5 and the partition wall 6, and is normally folded as shown in the figure. It is stored. A sheet-like material 8 is attached to the inner wall of the ink ribbon storage chamber 7 to improve the transportability of the ink ribbon 2. The partition wall 5 is provided so that the ink ribbon 2 does not flow backward from the ink ribbon storage chamber 7 to the feed roll 4 side and is not wound around the feed roll 4. The partition wall 6 is provided from the ink ribbon storage chamber 7 to the ink ribbon 2. A narrow slit that is slightly larger than the thickness of the ink ribbon 2 is provided as a path of the ink ribbon provided in the partition wall 6 so as not to come out together. The ink ribbon 2 that has come out of the ink ribbon storage chamber 7 from the slit of the partition wall 6 is braked by the ribbon brake 9 and then fed out of the ink ribbon cassette 1 from the ribbon outlet 10 and then to the head portion of the dot impact printer. Supplied. The ink ribbon 2 that has come out of the ink ribbon cassette 1 is loosened during printing, and a constant tension is maintained between the ribbon brake 9 and the feed roll 4 so that printing defects do not occur. . When an abnormally high tension is applied to the ink ribbon 2, a torque abnormality is detected by a sensor attached to the drive shaft of the printer interlocked with the feed roll 4, and the force is stopped so that the dot impact printer is not damaged by the abnormality. Such a mechanism is usually provided in a dot impact printer.

  FIG. 2 is likely to occur when an ink ribbon 2 longer than usual is loaded in the ink ribbon cassette 1 and the sheet-like material (8 in FIG. 1) used in the present invention is not attached to the ink ribbon storage chamber 7. It is the schematic diagram which showed an example of the conveyance abnormality of an ink ribbon. As shown in FIG. 2, when an ink ribbon 2 that is longer than usual is loaded into the ink ribbon cassette 1, the density of the ink ribbon 2 in the ink ribbon storage chamber 7 increases. In particular, the entrance of the ink ribbon storage chamber 7 is increased. As a result of the particularly high density of the ink ribbon 2 on the side, that is, the portion close to the feed roll 4 and the partition wall 5, the internal pressure applied to the ink ribbon 2 becomes very high at that portion. The force for the ink ribbon 2 to come out of the ink ribbon storage chamber 7 is larger than the force pushed into the ink ribbon storage chamber 7, and the ink ribbon 2 feeds as indicated by 11 in FIG. There arises a problem of leaking from the gap between the feed roll 4 and the partition wall 5 to the outside of the ink ribbon storage chamber 7 in a state where the roll 4 is clinging. Further, when the leaked ink ribbon 2 is entangled between the ink ribbons or wound around the feed roll 4, the ink ribbon 2 cannot be conveyed normally, and as a result, the dot impact is detected. Problems such as the printer stopping or the ink ribbon itself breaking.

  Another problem is that when the ink ribbon 2 adheres to the inner wall surface of the ink ribbon storage chamber 7 for some reason, the internal pressure applied to the ink ribbon 2 in the ink ribbon storage chamber 7 is high, which is indicated by 12 in FIG. As shown in FIG. 2, when the ink ribbon 2 is conveyed as it is, the phenomenon that the ink ribbon 2 is easily sandwiched between the inner wall surface of the ink ribbon storage chamber 7 and the ink ribbon 2 occurs. As described above, the ink ribbon 2 is firmly sandwiched between the inner wall surface and the ink ribbon 2. When the ink ribbon 2 of this portion (13 in FIG. 2) is pulled out from the ink ribbon storage chamber 7, the ink ribbon 2 is pulled out, that is, against the force with which the ink ribbon 2 is pulled by the feed roll 4. A drag force is generated between the ribbon 2 and the inner wall surface. As a result, the tension of the ink ribbon 2 between the ribbon brake 9 and the feed roll 4, that is, the head portion of the dot impact printer becomes unstable. This may cause problems such as shading unevenness in printing. Further, if the drag generated at the portion 13 in FIG. 2 is larger than the force that pulls the ink ribbon 2 by the feed roll 4, the ink ribbon 2 cannot be sent out, and the dot impact printer that detects the abnormality stops, Inconveniences such as breakage of the ribbon 2 itself may occur. In addition, when the portion 13 in FIG. 2 is pulled to come out from the slit portion of the partition wall 6, even when the ink ribbons are entangled with each other, the ink ribbon is clogged at the slit portion of the partition wall 6, and the same as described above. Bugs may occur.

  One of the causes of the ink ribbon conveyance abnormality as described above is related to the slipperiness between the ink ribbon and the inner wall surface of the ink ribbon storage chamber, and the friction of the inner wall surface of the ink ribbon storage chamber. When the coefficient increases, the ink ribbon transportability deteriorates, and an ink ribbon transport abnormality such as the portion 11 in FIG. 2 is likely to occur. When the friction coefficient of the inner wall surface of the ink ribbon storage chamber decreases, the ink ribbon transportability decreases. It has been found that there is a tendency that the above-described ink ribbon conveyance abnormality is less likely to occur.

  As a result of further investigation by the present inventor, the cause of the ink ribbon conveyance abnormality is not only due to the friction coefficient of the inner wall surface of the ink ribbon storage chamber, but also the wettability of the inner wall surface of the ink ribbon storage chamber to the oil agent. It turned out that. Using the oleic acid often used by the inventor as one of the raw materials for the ink of the ink ribbon, the wettability (static contact angle) of oleic acid on the surface of the various sheet-like materials in contact with the ink ribbon Was measured and affixed to the inner wall surface of the ink ribbon storage chamber to compare the ink ribbon transport abnormalities. Sheet materials with good oleic acid wettability (small static contact angle) As a result, the ink ribbon easily adheres to the sheet-like material, and the ink ribbon transport abnormality such as the portion 12 in FIG. 2 and the portion 13 in FIG. 2 is likely to occur, and conversely, the wettability of oleic acid is poor (static It was found that the sheet ribbon having a larger contact angle is less likely to adhere to the ink ribbon and the ink ribbon transport abnormality as described above is less likely to occur.

  Furthermore, as a result of intensive studies by the inventors, the coefficient of dynamic friction between the surfaces on the side in contact with the ink ribbon is 0.45 or less on at least one inner wall surface of the ink ribbon storage chamber and the side in contact with the ink ribbon. It was found that the occurrence of problems due to abnormal ink ribbon conveyance can be more effectively suppressed by selecting and sticking a sheet-like material having a static contact angle of oleic acid of 60 ° or more on the surface.

  The dynamic friction coefficient between the surfaces of the sheet-like material used in the present invention on the side in contact with the ink ribbon will be described in detail. Two sheets are prepared, and the surface of the sheet-like material on the side in contact with the ink ribbon By measuring the dynamic friction force generated between the surface of the sheet-like material on the side in contact with the ink ribbon by using a surface property measuring instrument HEIDON-14 (manufactured by Shinto Kagaku Co., Ltd.) by a method based on ASTM D1894. Asked.

  The coefficient of dynamic friction between the surfaces of the sheet-like material on the side in contact with the ink ribbon is preferably at least 0.45 or less, more preferably 0.35 or less. The lower limit is not particularly limited, and the lower the better, the better. However, the lower limit may be at least 0.01 in terms of measurement sensitivity. When the coefficient of dynamic friction between the surfaces of the sheet-like material on the side in contact with the ink ribbon exceeds the upper limit of the above range, the ink ribbon cannot be smoothly transported, and the portion on the side near the feed roll in the ink ribbon storage chamber However, if the ink ribbon density is less than the upper limit, the ink ribbon will be transported smoothly and the ink ribbon will not be transported correctly. Is less likely to occur.

  The static contact angle of oleic acid on the surface of the sheet-like material in contact with the ink ribbon of the present invention will be described in detail. The static contact angle of oleic acid is a contact angle meter Model CA manufactured by Kyowa Interface Science Co., Ltd. Using -X, oleic acid was dropped on the surface on the side in contact with the horizontally installed ink ribbon, and the contact angle of oleic acid after standing for 1 minute was measured.

  The static contact angle of oleic acid on the surface of the sheet-like material that contacts the ink ribbon is preferably at least 60 ° or more, and more preferably 65 ° or more. The upper limit value is not particularly limited and is preferably as large as possible, but is usually 150 ° or less. If the static contact angle of oleic acid on the surface of the sheet-like material in contact with the ink ribbon falls below the lower limit of the above range, the ink ribbon tends to adhere to the inner wall of the ink ribbon storage chamber, and the ink ribbon is not transported correctly. However, if the ink ribbon is not less than the lower limit value, the ink ribbon is less likely to adhere to the inner wall of the ink ribbon storage chamber.

  The sheet-like material used in the present invention is effective when applied to at least one inner wall surface of the ink ribbon storage chamber, but it is most prominently effective when applied to the inner wall surface which is preferably the bottom surface during actual use. If it is applied to all the inner wall surfaces, it is most effective. Moreover, although it is effective only to affix to any one of the inner wall surfaces, it is preferable to affix at least one third of the area of the entire inner wall surface of the ink ribbon storage chamber to the feed roll side portion of the ink ribbon storage chamber. Further, it is more preferable to apply more than 1/2 area, and most preferable to apply to the entire area of any one of the inner wall surfaces.

  Since the sheet-like material used in the present invention is always in contact with the oil contained in the ink ribbon in the ink ribbon storage chamber, it is preferable to use a sheet with little dimensional change and curl when immersed in the oil for a long time. For example, the present inventors completely immersed the sheet-like material in oleic acid at 40 ° C. and stored it for 7 days, and the dimensional change rate before and after storage was within the range of −1.0 to 1.0%. A certain sheet-like material was selected and used. To calculate the dimensional change rate, prepare a sample of a 6cm x 6cm square sheet, first measure the length of the four sides before the storage test, and then measure the length of the corresponding four sides again after the storage test. To do. Then, the dimensional change rate of each side before and after storage is expressed as “dimensional change rate (%) = ((side length after saving) − (side length before saving)) ÷ (side length before saving)” And the average value of the dimensional change rate before and after storage of each side was defined as the dimensional change rate of the sheet-like material. If the rate of dimensional change of the sheet-like material is within the above range, problems such as wrinkles are unlikely to occur on the surface of the sheet-like material. In addition, there is a tendency that the conveyance of the ink ribbon deteriorates due to the generated wrinkles.

<< About details of sheet-like material >>
A sheet-like material 8 having a cross-sectional structure as illustrated in FIG. 3 is attached to the inner wall of the ink ribbon storage chamber of the ink ribbon cassette of the present invention. The sheet-like material 8 is basically a paper or resin sheet as a base material 14, a slipping layer 15 that contacts the ink ribbon on one side of the base material 14, and an inner wall of the ink ribbon storage chamber on the other side. Although it has the structure which provided the adhesion layer 16 used in order to stick on a surface, it is not limited to this, For example, various functions, such as a sealing layer, an under layer, and a barrier layer, between the slippery layer 15 and the base material 14 -You may provide the layer for improving durability, the layer for improving the adhesiveness of the base material 14, such as an intermediate | middle layer and a primer layer, and the slippery layer 15, etc. Further, the slippery layer 15 may not be provided if the dynamic friction coefficient of the base material 14 itself is sufficiently low and the contact angle with respect to oleic acid is sufficiently high. When sticking to the inner wall of the ink storage chamber, it may not be provided.

<Base material>
The thickness of the base material 14 of the sheet-like material used in the present invention is not particularly limited, but may be in the range of 10 to 300 μm, and more preferably in the range of 30 to 200 μm. If the thickness of the substrate is in the above range, it is easy to handle and has sufficient strength. The material of the base material 14 is not particularly limited, but a material having water resistance and oil resistance, small dimensional change and deformation when absorbed or absorbed, and having appropriate heat resistance and strength is selected. Specifically, impregnated paper, coated paper, various resin films and composite laminates thereof satisfying the above conditions can be used.

<Sliding layer>
As the slipping layer 15 of the sheet-like material used in the present invention, it is preferable to use a raw material having a small surface friction coefficient and water / oil repellency as a main raw material, and such a material is not particularly limited. However, it is usually preferable to use a silicon-based copolymer resin or a fluorine-based copolymer resin. As a method for forming a slipping layer using such a silicon-based copolymer resin or a fluorine-based copolymer resin, for example, a material obtained by coating each copolymer resin with a paint is applied to the substrate 14 by various known coating methods. Although there is a method of forming by drying after coating, etc., it is not particularly limited, and a method of forming a slipping layer by co-extrusion together with a base material layer, or after forming the slipping layer in a film shape in advance A method of forming a slipping layer by laminating with a substrate may be used. Further, if necessary, various known resins, various known crosslinking agents, various known silane coupling agents, various known inorganic / organic fillers, and the like are added to the material of the slipping layer, and the mechanical strength of the slipping layer is increased. And chemical resistance may be improved, or adhesion to the substrate and other layers may be improved. Although the thickness of a slipping layer is not specifically limited, It is preferable that it is the range of 0.01-10 micrometers, and it is more preferable that it is the range of 0.05-3 micrometers. If the thickness of the slipping layer is within the above range, the slipping of the surface of the slipping layer is good, and the water repellency and oil repellency can be satisfactorily exhibited.

  As described above, the slippery layer 15 corresponds to the surface on the side in contact with the ink ribbon, so that the dynamic friction coefficient between the slippery layers is at least 0.45 or less and the static contact angle of oleic acid is at least 60 °. Since it is necessary to be the above, it is necessary to set the raw material composition and formation conditions that satisfy the requirements. Further, as described above, when the base material 14 itself satisfies the above conditions of the coefficient of dynamic friction and the static contact angle of oleic acid, it is not necessary to provide a slipping layer.

<Adhesive layer>
The raw material of the pressure-sensitive adhesive layer 16 of the sheet-like material used in the present invention is not particularly limited, but various known pressure-sensitive adhesives can be used, for example, acrylic pressure-sensitive adhesives, silicon-based pressure-sensitive adhesives, fluorine-based pressure-sensitive adhesives, It is possible to use one or two of rubber adhesives, urethane adhesives, polyester adhesives, polyamide adhesives and the like in combination, but the invention is not limited to this. In addition, various known tackifying resins, elastomers, cross-linking agents, inorganic / organic fillers, etc. are added to the pressure-sensitive adhesive, and adjustments such as adjustment of adhesive strength, improvement of chemical resistance and provision of removability are appropriately performed. Also good. Although the thickness of an adhesion layer is not specifically limited, It is preferable that it is the range of 1-70 micrometers, and it is more preferable that it is the range of 5-30 micrometers. If the thickness of the adhesive layer is within the above range, it is possible to have an appropriate adhesive force. The method for forming the adhesive layer is not particularly limited, but various known coating methods and printing methods may be used, and known coating methods include gravure coating, bar coating, comma coating, kiss coating, reverse coating, As a known printing method, an adhesive layer may be formed on the substrate 14 using a method such as gravure printing, screen printing, flexographic printing or the like. The adhesive layer 16 may be uniformly formed on the entire surface of the sheet-like material, but more preferably, the adhesive layer 16 is formed in a dot pattern as shown in FIG. By making the formation pattern of the pressure-sensitive adhesive layer 16 into a dot shape, the sheet-like material 8 is prevented from concentrating the influence of distortion generated when the dimension changes due to moisture absorption, oil absorption or heat on a specific place. In addition, it is possible to suppress the occurrence of significant wrinkles and deformations in specific portions of the sheet-like material 8 and to reduce the occurrence of problems in the ink ribbon transportability due to the wrinkles of the sheet-like material 8. As another effect, the sticking-out of the adhesive at the end of the sheet-like material can be suppressed by making the formation pattern of the adhesive layer into a dot shape. If the adhesive sticks out, the sticking adhesive may adversely affect the ink ribbon transportability, so suppressing the sticking of the adhesive directly reduces the occurrence of problems due to abnormal ink ribbon transport. It becomes possible to do.

  The shape of the dots of the dot-shaped formation pattern of the adhesive layer is not particularly limited, and may be circular or square, but it is more preferable to effectively suppress wrinkles due to distortion that it is the target shape vertically and horizontally. For the same reason, it is preferable that the arrangement of the dot-shaped formation patterns is an equal arrangement in the left, right, up and down directions. Moreover, it is preferable that the area ratio of the dot-shaped adhesion layer formed on the base material is 5 to 80% per unit area of a base material, and it is more preferable that it is 30 to 70%. If the area ratio of the adhesive layer formed in a dot shape is within the above range, it is possible to suppress wrinkles and protrusion of the adhesive due to distortion of the sheet-like material while ensuring a necessary and sufficient adhesive force.

  Next, although an Example, a comparative example, etc. are given and this invention is demonstrated concretely, this invention is not limited to an Example.

<< About ink ribbon cassette and ink ribbon >>
The ink ribbon cassette used in the examples and comparative examples is made of ABS resin, and the inner dimensions of the ink ribbon storage chamber are 29 cm long, 4 cm wide, and 1.5 cm high. The standard ink ribbon loaded in this cassette has a width of 13 mm and a length of 28 m. However, in the ink ribbon cassette of the present invention, the length of the same ink ribbon having the width of 13 mm is increased by about 25%, and an ink having a length of 35 m is added. The ribbon was loaded into an ink ribbon cassette and used for evaluation.

<< About sheet-like materials >>
Details of the sheet-like material attached to the inner wall of the ink ribbon storage chamber of the ink ribbon cassette used in the examples and comparative examples will be described below. In the examples and comparative examples, the sheet ribbon is attached to the inner wall surface at the same position as 8 in FIG. 1, and the size of the inner wall surface of the ink ribbon storage chamber is 29 cm × 1. .5 cm.

A coating containing silicon copolymer resin 1 and a crosslinking agent is applied to one surface of the PET film by bar coating, and then dried and crosslinked with a drier to form a slipping layer, and the other surface of the PET film. A sheet-like material 1 used in the ink ribbon cassette of Example 1 was prepared by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint in a dot shape by screen printing followed by drying with a dryer. Details of the sheet-like material 1 are shown below. In the following detailed description, “total thickness” means the total thickness of the base material layer, the slipping layer, and the adhesive layer of the sheet-like material, and “area ratio of the adhesive layer” means the adhesive per unit area on the base material. It means the ratio of the area where the layers are formed. “Dynamic coefficient of friction” means the coefficient of friction between the surfaces of the sheet-like material in contact with the ink ribbon. “Contact angle of oleic acid” means the sheet shape. This means the static contact angle of oleic acid on the surface of the object that comes into contact with the ink ribbon, and the “dimensional change rate of oleic acid immersion test” means that the sheet is completely immersed in oleic acid at 40 ° C. It means the dimensional change rate of the sheet before and after storage for 7 days.
<Sheet 1>
Total thickness: 95.1 μm
Width: 13mm
Length: 27cm
Type of substrate: PET film substrate thickness: 75 μm
Material type of slipping layer: Silicone copolymer resin 1
Sliding layer thickness: 0.1 μm
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of adhesive layer: Round dot (circle with a radius of 3 mm)
Adhesive layer area ratio: 57%
Coefficient of dynamic friction: 0.30
Contact angle of oleic acid: 80 °
Dimensional change rate of oleic acid immersion test: 0.2%

A coating containing silicon copolymer resin 1 and a crosslinking agent is applied to one side of the impregnated paper by bar coating, followed by drying and cross-linking with a dryer, and then the other side of the impregnated paper is formed. A sheet-like material 2 used in the ink ribbon cassette of Example 2 was prepared by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint in a dot shape by screen printing and then drying with a dryer. The difference between the sheet-like material 1 and the sheet-like material 2 is only the kind of the substrate. Details of the sheet-like material 2 are shown below. <Sheet 2>
Total thickness: 120.1μm
Width: 13mm
Length: 27cm
Type of substrate: Impregnated paper substrate thickness: 100 μm
Material type of slipping layer: Silicone copolymer resin 1
Sliding layer thickness: 0.1 μm
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of adhesive layer: Round dot (circle with a radius of 3 mm)
Adhesive layer area ratio: 57%
Coefficient of dynamic friction: 0.29
Contact angle of oleic acid: 79 °
Dimensional change rate of oleic acid immersion test: -0.1%

A coating containing silicon copolymer resin 2 and a cross-linking agent is applied to one side of the PET film by bar coating, and then dried and cross-linked with a dryer to form a slipping layer, and the other side of the PET film. A sheet-like material 3 used in the ink ribbon cassette of Example 3 was prepared by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint in a dot shape by screen printing followed by drying with a dryer. The difference between the sheet-like material 1 and the sheet-like material 3 is only that the material type of the slipping layer is different. Details of the sheet 3 are shown below.
<Sheet 3>
Total thickness: 95.1 μm
Width: 13mm
Length: 27cm
Type of substrate: PET film substrate thickness: 75 μm
Material type of slipping layer: Silicone copolymer resin 2
Sliding layer thickness: 0.1 μm
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of adhesive layer: Round dot (circle with a radius of 3 mm)
Adhesive layer area ratio: 57%
Coefficient of dynamic friction: 0.40
Contact angle of oleic acid: 65 °
Dimensional change rate of oleic acid immersion test: 0.0%

A coating containing silicon copolymer resin 3 and a crosslinking agent is applied to one surface of the PET film by bar coating, and then dried and crosslinked with a dryer to form a slipping layer, and the other surface of the PET film is further coated. A sheet-like material 4 used in the ink ribbon cassette of Example 4 was prepared by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint in a dot shape by screen printing and then drying with a dryer. The difference between the sheet-like material 1 and the sheet-like material 4 is only that the material type of the slipping layer is different. Details of the sheet-like material 4 are shown below.
<Sheet 4>
Total thickness: 95.1 μm
Width: 13mm
Length: 27cm
Type of substrate: PET film substrate thickness: 75 μm
Material type of slipping layer: Silicone copolymer resin 3
Sliding layer thickness: 0.1 μm
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of adhesive layer: Round dot (circle with a radius of 3 mm)
Adhesive layer area ratio: 57%
Coefficient of dynamic friction: 0.35
Contact angle of oleic acid: 60 °
Dimensional change rate of oleic acid immersion test: 0.1%

A coating containing fluorine-based copolymer resin 1 and a crosslinking agent is applied to one surface of the PET film by bar coating, and then dried and crosslinked with a dryer to form a slipping layer. Further, the other surface of the PET film is formed. A sheet-like material 5 used in the ink ribbon cassette of Example 5 was prepared by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint in a dot shape by screen printing and drying with a dryer. The difference between the sheet-like material 1 and the sheet-like material 5 is only that the material type of the slipping layer is different. Details of the sheet 5 are shown below.
<Sheet 5>
Total thickness: 95.1 μm
Width: 13mm
Length: 27cm
Type of substrate: PET film substrate thickness: 75 μm
Material type of slipping layer: Fluoropolymer resin 1
Sliding layer thickness: 0.1 μm
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of adhesive layer: Round dot (circle with a radius of 3 mm)
Adhesive layer area ratio: 57%
Coefficient of dynamic friction: 0.35
Contact angle of oleic acid: 70 °
Dimensional change rate of oleic acid immersion test: 0.0%

A coating containing silicon copolymer resin 1 and a crosslinking agent is applied to one side of the PP film by bar coating, and then dried and crosslinked with a dryer to form a slipping layer, and the other side of the PP film. A sheet-like material 6 used in the ink ribbon cassette of Example 6 was prepared by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint in a dot shape by screen printing followed by drying with a dryer. The difference between the sheet-like material 1 and the sheet-like material 6 is only the kind of the substrate. Details of the sheet 6 are shown below.
<Sheet 6>
Total thickness: 95.1 μm
Width: 13mm
Length: 27cm
Type of substrate: PP film substrate thickness: 75 μm
Material type of slipping layer: Silicone copolymer resin 1
Sliding layer thickness: 0.1 μm
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of adhesive layer: Round dot (circle with a radius of 3 mm)
Adhesive layer area ratio: 57%
Coefficient of dynamic friction: 0.29
Contact angle of oleic acid: 80 °
Dimensional change rate of oleic acid immersion test: 1.0%

A coating containing silicon copolymer resin 1 and a crosslinking agent is applied to one side of the PP film by bar coating, and then dried and crosslinked with a dryer to form a slipping layer, and the other side of the PP film. A sheet-like material 7 used in the ink ribbon cassette of Example 7 was prepared by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint on the entire surface by bar coating and then drying it with a dryer. The difference between the sheet-like material 6 and the sheet-like material 7 is only that the formation pattern of the adhesive layer is different. Details of the sheet 7 are shown below.
<Sheet 7>
Total thickness: 95.1 μm
Width: 13mm
Length: 27cm
Type of substrate: PP film substrate thickness: 75 μm
Material type of slipping layer: Silicone copolymer resin 1
Sliding layer thickness: 0.1um
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of the adhesive layer: Area ratio of the entire solid adhesive layer: 57%
Coefficient of dynamic friction: 0.29
Contact angle of oleic acid: 80 °
Dimensional change rate of oleic acid immersion test: 1.0%

A coating containing silicon copolymer resin 1 and a crosslinking agent is applied to one surface of the HDPE film by bar coating, and then dried and crosslinked with a dryer to form a slipping layer. Further, the other surface of the HDPE film is formed. A sheet-like material 8 used in the ink ribbon cassette of Example 8 was prepared by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint in a dot shape by screen printing followed by drying with a dryer. The difference between the sheet-like material 1 and the sheet-like material 8 is only the kind of the substrate. Details of the sheet-like material 8 are shown below.
<Sheet 8>
Total thickness: 95.1 μm
Width: 13mm
Length: 27cm
Base material type: HDPE film base material thickness: 75 μm
Material type of slipping layer: Silicone copolymer resin 1
Sliding layer thickness: 0.1 μm
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of adhesive layer: Round dot (circle with a radius of 3 mm)
Adhesive layer area ratio: 57%
Coefficient of dynamic friction: 0.30
Contact angle of oleic acid: 79 °
Dimensional change rate of oleic acid immersion test: 1.4%

A coating containing silicon copolymer resin 1 and a crosslinking agent is applied to one surface of the HDPE film by bar coating, and then dried and crosslinked with a dryer to form a slipping layer. Further, the other surface of the HDPE film is formed. A sheet-like material 9 used in the ink ribbon cassette of Example 9 was prepared by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint on the entire surface by bar coating and then drying it with a dryer. The difference between the sheet-like material 8 and the sheet-like material 9 is only that the formation pattern of the adhesive layer is different. Details of the sheet 9 are shown below.
<Sheet 9>
Total thickness: 95.1 μm
Width: 13mm
Length: 27cm
Base material type: HDPE film base material thickness: 75 μm
Material type of slipping layer: Silicone copolymer resin 1
Sliding layer thickness: 0.1 μm
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of the adhesive layer: Area ratio of the entire solid adhesive layer: 57%
Coefficient of dynamic friction: 0.30
Contact angle of oleic acid: 79 °
Dimensional change rate of oleic acid immersion test: 1.4%

<Comparative Example 1>
The ink ribbon cassette of Comparative Example 1 was an ink ribbon cassette in which no sheet-like material was stretched in the ink ribbon storage chamber. The dynamic friction coefficient and the contact angle of oleic acid are measured values on the inner wall of the ink ribbon storage chamber.
<Inner wall of ink ribbon storage room>
Material of inner wall: ABS resin dynamic friction coefficient (inner wall): 1.01
Oleic acid contact angle (inner wall): 19 °

<Comparative example 2>
In the ink ribbon cassette of Comparative Example 2, a slipping layer is not provided on the PET film, and an adhesive layer is formed by applying acrylic adhesive paint on one surface in a dot shape by screen printing and then drying with a dryer. A sheet 10 to be used was prepared. The only difference between the sheet-like material 1 and the sheet-like material 10 is whether or not a slipping layer is provided. Details of the sheet-like material 10 are shown below.
<Sheet 10>
Total thickness: 95μm
Width: 13mm
Length: 27cm
Type of substrate: PET film substrate thickness: 75 μm
Material type of the slipping layer: None Thickness of the slipping layer: None Material type of the adhesive layer: Thickness of the acrylic pressure-sensitive adhesive layer: 20 μm
Formation pattern of adhesive layer: Round dot (circle with a radius of 3 mm)
Adhesive layer area ratio: 57%
Coefficient of dynamic friction: 0.53
Contact angle of oleic acid: 5 °
Dimensional change rate of oleic acid immersion test: 0.2%

<Comparative Example 3>
A coating containing silicon copolymer resin 4 and a crosslinking agent is applied to one surface of the PET film by bar coating, and then dried and crosslinked with a dryer to form a slipping layer, and the other surface of the PET film is further coated. A sheet-like material 11 used in the ink ribbon cassette of Comparative Example 3 was prepared by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint in a dot shape by screen printing and then drying with a dryer. The difference between the sheet-like material 1 and the sheet-like material 11 is only that the material type of the slipping layer is different. Details of the sheet 11 are shown below.
<Sheet 11>
Total thickness: 95.1 μm
Width: 13mm
Length: 27cm
Type of substrate: PET film substrate thickness: 75 μm
Material type of slipping layer: Silicone copolymer resin 4
Sliding layer thickness: 0.1 μm
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of adhesive layer: Round dot (circle with a radius of 3 mm)
Adhesive layer area ratio: 57%
Coefficient of dynamic friction: 0.40
Contact angle of oleic acid: 50 °
Dimensional change rate of oleic acid immersion test: 0.1%

<Comparative example 4>
A coating containing fluorine-based copolymer resin 2 and a crosslinking agent is applied to one surface of the PET film by bar coating, and then dried and crosslinked with a dryer to form a slipping layer, and the other surface of the PET film. A sheet-like material 12 used in the ink ribbon cassette of Comparative Example 4 was formed by forming an adhesive layer by applying an acrylic pressure-sensitive adhesive paint in a dot shape by screen printing and then drying with a dryer. The difference between the sheet-like material 1 and the sheet-like material 12 is only that the material type of the slipping layer is different. Details of the sheet-like material 12 are shown below.
<Sheet 12>
Total thickness: 95.1 μm
Width: 13mm
Length: 27cm
Type of substrate: PET film substrate thickness: 75 μm
Material type of slipping layer: Fluorine copolymer resin 2
Sliding layer thickness: 0.1 μm
Adhesive layer raw material type: Acrylic adhesive adhesive layer thickness: 20 μm
Formation pattern of adhesive layer: Round dot (circle with a radius of 3 mm)
Adhesive layer area ratio: 57%
Dynamic friction coefficient: 0.50
Contact angle of oleic acid: 70 °
Dimensional change rate of oleic acid immersion test: 0.1%

<Reference example>
For reference, an ink ribbon cassette in which the amount of ink ribbon loaded in the same ink ribbon cassette as in Comparative Example 1 was reduced and an ink ribbon having a standard width of 13 mm × length of 28 m was loaded was used as the ink ribbon cassette of the reference example. The measurement values such as the dynamic friction coefficient of the inner wall surface of the ink ribbon storage chamber and the contact angle of oleic acid are the same as those in Comparative Example 1, and will be omitted.

<Evaluation of ink ribbon transportability>
The ink ribbon cassette of the example / comparative example is mounted on a dot impact printer, and a print test is performed to print a test pattern of 1.8 million characters in an environment of room temperature 23 ° C. and humidity 50% RH. The state of the ink ribbon was visually observed, and the ink ribbon transportability was evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: There is almost no deviation in the density of the ink ribbon in the ink ribbon storage chamber.
B: The density of the ink ribbon in the portion on the feed roll side of the ink ribbon storage chamber is slightly high.
C: The density of the ink ribbon in the portion on the feed roll side of the ink ribbon storage chamber is very high.

<Evaluation of ink ribbon adhesion>
The ink ribbon cassette of the example / comparative example is mounted on a dot impact printer, and a print test is performed to print a test pattern of 100,000 characters in an environment of a room temperature of 23 ° C. and a humidity of 50% RH. The state of the ink ribbon in contact with the stuck sheet was visually observed, and the ink ribbon adhesion was evaluated according to the following evaluation criteria. (* Evaluation was made by visually observing the state of the ink ribbon in contact with the wall surface of the ink ribbon storage room when no sheet-like material was attached.)
(Evaluation criteria)
A: No ink ribbon adheres to the sheet-like material or the wall surface of the ink ribbon storage chamber.
B: The ink ribbon rarely adheres to the sheet-like object or the wall surface of the ink ribbon storage chamber.
C: Ink ribbon tends to adhere frequently to the sheet-like material or the wall surface of the ink ribbon storage room.

<Evaluation of wrinkles on sheet>
The ink ribbon cassette of the example / comparative example is mounted on a dot impact printer, and a print test is performed to print a test pattern of 1.8 million characters in an environment of room temperature 40 ° C. and humidity 85% RH. The state of the sheet-like material was visually observed, and wrinkles of the sheet-like material were evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: No wrinkles or irregularities occur on the surface of the sheet-like material.
B: Slightly fine wrinkles and irregularities are seen on the surface of the sheet-like material.
C: Clear wrinkles and irregularities are generated on the surface of the sheet-like material.

<Evaluation of defects due to abnormal ink ribbon transport>
The ink ribbon cassette of the example / comparative example is mounted on a dot impact printer, and a print test is performed to print a test pattern of 1.8 million characters in an environment of room temperature 23 ° C. and humidity 50% RH, and the behavior and occurrence of the ink ribbon during the print test The failure was visually observed, and the failure due to abnormal transport of the ink ribbon was evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: No defect is observed until the end of the printing test.
B: Although the printer does not stop abnormally due to the breakage of the ink ribbon or the abnormal torque of the feed roll, the shading unevenness of the printing was rarely seen.
C: Density unevenness of printing frequently occurred, and finally the printer stopped abnormally due to breakage of the ink ribbon or abnormal torque of the feed roll.

  Table 1 shows various evaluation results of the ink ribbon cassettes of the examples of the present invention and the comparative examples.

  As shown in Examples 1 to 9, even in an ink ribbon cassette loaded with an ink ribbon longer than usual, a sheet-like material is attached to at least one inner wall surface of the ink ribbon storage chamber of the ink ribbon cassette, The coefficient of dynamic friction between the surfaces of the sheet-like material on the side in contact with the ink ribbon is 0.45 or less, and the static contact angle of oleic acid on the surface of the sheet-like material on the side in contact with the ink ribbon is 60 ° or more. If so, it can be seen that the transportability of the ink ribbon and the adhesion of the ink ribbon are excellent, and as a result, problems due to abnormal transport of the ink ribbon can be suppressed.

  Moreover, when Example 7 and Example 9 are compared, if the dimensional change rate of the oleic acid immersion test of the sheet is out of the range of -1.0 to 1.0%, wrinkles are generated on the surface of the sheet, It can be seen that this has a slight influence on the transportability of the ink ribbon. Further, when Example 8 and Example 9 are compared, it is possible to suppress the wrinkles of the sheet-like material when the formation pattern of the adhesion layer is a round dot shape compared to the case where the formation pattern of the adhesion layer is a solid surface. Recognize.

  When no sheet-like material was affixed to the inner wall surface of the ink ribbon storage chamber of the ink ribbon cassette as in Comparative Example 1, the transportability of the ink ribbon and the adhesion of the ink ribbon were very poor, and the printing test was in progress. Ink ribbon transport abnormality occurred and various problems occurred. Comparing the comparative example 1 with the reference example loaded with the standard length ink ribbon, the ink ribbon cassette of the reference example 1 can be used without any problem, but the ink loaded like the ink ribbon cassette of the comparative example 1 It can be seen that as the length of the ribbon increases, the evaluation of the ink ribbon transportability and the ink ribbon adhesion deteriorates rapidly.

  In the case where a sheet-like material is affixed to the inner wall surface of the ink ribbon storage chamber as in Comparative Example 2, but the slipping layer made of a slipping material or the like is not provided on the surface in contact with the ink ribbon, the dynamic friction coefficient is 0. Since it exceeded 45 and the contact angle of oleic acid was less than 60 °, the transportability of the ink ribbon and the adherence of the ink ribbon were deteriorated, and various problems due to abnormal transport of the ink ribbon occurred during the printing test.

  When the contact angle of oleic acid in the slippery layer of the sheet-like material is less than 60 ° as in Comparative Example 3, the adhesion of the ink ribbon deteriorates, and the ink ribbon is contained in the ink ribbon storage chamber. It is easy to generate a conveyance abnormality that is caught between the inner wall and the ink ribbon, which causes frequent printing unevenness due to abnormal ribbon tension, and the ink ribbons get tangled or gathered together. Problems such as an abnormal stop of the printer or breakage of the ink ribbon itself occurred due to the ink ribbon becoming clogged when trying to exit from the storage chamber outlet.

  When the coefficient of dynamic friction between the surfaces of the sliding layer of the sheet-like material exceeds 0.45 as in Comparative Example 4, the ink ribbon transportability deteriorates and the ink ribbon in the portion near the feed roll in the ink ribbon storage chamber As a result of the extremely high density of the ink ribbon, the ink ribbon is pushed out from the entrance of the ink ribbon storage chamber to the feed roll side, and it becomes easy to cause conveyance abnormalities such as entanglement with the feed roll, which causes the printer to stop abnormally And problems such as breakage of the ink ribbon itself occurred.

1: ink ribbon cassette 2: ink ribbon 3: ribbon inlet 4: feed roll 5: partition wall 6: partition wall 7: ink ribbon storage chamber 8: sheet-like material 9: ribbon brake 10: ribbon outlet 11: transport abnormality occurrence site (ink ribbon) Leakage from storage room)
12: Conveyance abnormality occurrence part (1 sandwiched between the inner wall surface and the ink ribbon)
13: Conveyance abnormality occurrence part (2 sandwiched between the inner wall surface and the ink ribbon)
14: Base material 15: Sliding layer 16: Adhesive layer

Claims (3)

  An ink ribbon cassette for a dot impact printer for storing an endless ink ribbon impregnated with ink in a fabric, wherein a sheet-like material is affixed to at least one inner wall surface of the ink ribbon storage chamber, An ink ribbon cartridge characterized by having a coefficient of dynamic friction between the surfaces on the contact side surface of 0.45 or less and a static contact angle of oleic acid on the surface of the sheet-like material contacting the ink ribbon of 60 ° or more. set.   When the sheet-like material is completely immersed in oleic acid at 40 ° C. and stored for 7 days, the dimensional change rate of the sheet-like material before and after storage is in the range of −1.0 to 1.0%. The ink ribbon cassette according to claim 1, wherein:   The ink ribbon cassette according to claim 1 or 2, wherein the sheet-like material has an adhesive layer, and the formation pattern of the adhesive layer is dot-like.