JP2531457Y2 - Ink ribbon cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ink ribbon cassette used in a printer or a typewriter, which presses an ink ribbon with a pair of rolls and feeds the ink ribbon into an ink ribbon storage section.

[Related Art] Conventionally, an ink ribbon cassette which presses an ink ribbon with a pair of rolls and feeds the ink ribbon into an ink ribbon storage unit has the same position as a roll on which a plurality of rolls are opposed to a pair of parallel shafts. , And the rolls are all made of the same material and the same material. The material of the roll is a dense body made of NBR, urethane, etc. (aggregate of densely packed materials) or a foam made of NBR, urethane, polyethylene, etc. (porous body with fine voids in the material by foaming) )
Is common.

[Problem to be solved by the invention] Of the materials described in the prior art, all roll materials are NB
In the case of a dense body made of R, urethane, etc., the surface of the roll is generally smooth and a multi-strike ribbon having an ink-coated roughened surface and an ink-free smooth film surface In this method, the force of feeding the ink ribbon (hereinafter referred to as a ribbon feed force) is very large because the smooth adhesion of the roll to the smooth film surface of the ink ribbon on which the ink is not applied is very good. However, the smooth surface of the roll has poor adhesion to the roughened ink-coated surface after the ink has been applied, and when the roll is rotated to feed the ink ribbon, the ink ribbon leans toward the roll contacting the film surface. There is a problem that the ink ribbon is folded and the pressure of the ink ribbon is increased in the ink ribbon storage unit, so that the ink ribbon cannot be pulled out from the ink ribbon storage unit, or jamming cannot be performed to the ink ribbon storage unit.

Also, since the dense roll has a small amount of deformation of the pressed portion due to the pressed, a large pressure is applied to the pressed portion, and when the ink ribbon cassette is left for a long time while the ink ribbon is pressed, the roll is pressed against the roll on the ink applied surface of the ink ribbon. There is also a problem that the oil agent of the colorant oozes out from the contact portion and swells the pressure contact portion of the roll, and the ink ribbon is fused to the pressure contact portion and the ink ribbon cannot be fed.

Next, when the material of the roll is all foams made of NBR, urethane, polyethylene, etc., the surface of the roll is generally processed into a rough surface, and the surface of the roll is roughened against the smooth surface of the ink ribbon that is not coated with ink. The adhesiveness of the roll on the surface of the surface is not good, and the ribbon feed force is inferior to a case where the material of the roll is a dense body made of NBR, urethane or the like. Even if the pressing force of the roll is increased in order to improve the ribbon feeding force, not only sufficient improvement of the ribbon feeding force cannot be obtained, but also the rolling resistance of the roll increases due to the deformation of the roll due to the increase of the pressing force. There is a problem that the shaft torque for rotating the motor increases. Also, since the surface of the roll is rough, the frictional force of the roll acts more on the ink-coated surface which is rougher than the smooth film surface of the ink ribbon. There is also a problem that the ribbon is finely folded toward one side of the roll in contact with the ink application surface and jamming occurs.

Furthermore, if all rolls are made of the same material, regardless of whether the material is dense or foam, if the ink ribbon cassette is left for a long time while the rolls are pressed, the circular outer circumference of the pressed portions of all the rolls When the roll rotates to feed the ink ribbon while the restoring force is lost while the ink ribbon is deformed flat, the ink ribbon is not sent due to large fluctuations in the shaft torque, rapid adhesion of the roll to the ink ribbon, and changes in frictional force. There is a problem of uniformity.

Regarding the problem of the deformation of the roll, there is a method of mounting a component for releasing the pressure contact force of the roll. Is pressed by an elastic body such as a coil spring or a leaf spring. Recently, however, there is also an ink ribbon cassette in which the elastic body is abolished and a shaft provided with a roll is fixed for cost reduction. Cannot be mounted.

The present invention has been made in view of the above-described problems of the related art, and has as its object to provide a biased ribbon feeding and a long-time pressure contact of a roll due to a difference in adhesion and frictional force of a roll to an ink ribbon. It is an object of the present invention to improve the problem of the fusion of the ink ribbon to the roll and the deformation of the roll, and to provide an ink ribbon cassette having a strong ribbon feed force and a smooth and uniform ribbon feed.

[Means for Solving the Problems] In order to achieve the above object, the ink ribbon cassette according to the present invention uses NBR, urethane, polyethylene, etc. on the roughened surface of the ink ribbon of the pair of rolls where the ink is applied. Use a roll with a rough surface made of foam made of NBR, and use a roll with a smooth surface of dense body made of NBR, urethane, etc. on the other smooth film surface where ink is not applied. Was.

[Function] The roll of the foam having a rough surface on which the frictional force acts on the ink-coated surface of the ink ribbon, which has a rough surface, has good adhesion to the film surface of the ink ribbon, which has a smooth surface, on which the ink is not applied. Since the dense rolls having a smooth surface are pressed against each other, the ink ribbon is uniformly folded on both roll sides without being finely folded on one specific roll side.

In addition, since the dense roll is not pressed against the ink application surface side of the ink ribbon, there is no problem of fusion of the ink ribbon to the roll due to oil seeping out of the press contact portion of the ink application surface.

Next, regarding the problem of roll deformation due to leaving the roll pressed for a long time, the hardness of the material generally used for the roll of the ink ribbon cassette is 50 ° to 70 ° for a dense body made of NBR, urethane or the like. ° (JIS A type hardness tester), 20 ° to 40 ° (JIS A type hardness tester) for foams made of NBR, urethane, polyethylene, etc., of the roll used in the ink ribbon cassette of the present invention. The hardness of the dense body is 50 ° to 70 ° (JIS A type hardness tester), and that of the foam is 20 ° to 40 ° (JISA type hardness tester). Therefore, in the ink ribbon cassette according to the present invention, when the rolls are pressed against each other, the dense hard rolls hardly deform and the circular outer circumference of the dense hard rolls bites into the circular outer circumference of the low-hardness foam roll. In this state, the outer periphery of the roll having low hardness is deformed into an arc shape. Even if the roll rotates to feed the ink ribbon, the dense roll having high hardness is hardly deformed at all times and maintains a circular outer periphery. The outer periphery of the foam roll having low hardness is always deformed into an arc shape. Furthermore, even if the arc-shaped deformed part of the foam roll with low hardness loses the restoring force due to being pressed for a long time, the dense roll with almost no deformation with high hardness is pressed and the hardness of the dense body and the foam is reduced. When rotated to feed the ink ribbon due to the difference, the arc-shaped deformed part of the foam roll is corrected by the dense roll and the restoring force is restored, and the fluctuation of the shaft torque and the adhesion and friction of the roll to the ink ribbon Very little change in force.

[Effects of the Invention] The present invention is configured as described above, and the user of the present invention can obtain an ink ribbon cassette having a strong ribbon feed force and a smooth and uniform ribbon feed.

[Brief description of the drawings]

FIG. 1 shows the state of storage of the ink ribbon in the ink ribbon storage section, which occurs when the material of the roll of the conventional ink ribbon cassette is all dense, and FIG. 2 shows that the material of the roll of the conventional ink ribbon cassette is all foam. FIG. 3 shows a state in which the ink ribbon is stored in the ink ribbon storage section which occurs in a certain case. FIG. 3 shows a state in which the rolls of the conventional ink ribbon cassette are deformed by pressing when the materials and materials are all the same. FIG. FIG. 5 shows a state in which the roll is deformed due to the pressure contact of the ink ribbon cassette of the present invention, and FIG. 5 shows a state in which the deformed portion which has lost the restoring force due to the long-term pressing of the ink ribbon cassette of the present invention recovers the restoring force by the rotation of the roll. DESCRIPTION OF SYMBOLS 1 ... Ink ribbon 1-1 ... Ink application surface 1-2 ... Film surface 2 ... Ink ribbon cassette 2-1 ... Ink ribbon storage part 3 ... Dense roll 4 ... Foam roll 5 ... Deformation Part 6: Deformed portion that has lost restoring force 7: Deformed portion 8: Deformed portion that has lost restoring force

Claims (1)

(57) [Scope of request for utility model registration] An ink containing a colorant obtained by dispersing a pigment in an oil agent or dissolving a dye in the pores of a porous resin is applied to one surface of a film made of a resin such as polyester as a base material. In an ink ribbon cassette that processes a multi-strike ribbon that can be printed a number of times into an endless shape, presses it with a pair of rolls, and sends it to the ink ribbon storage unit, the roll on the side in contact with the film surface where the ink of the ink ribbon is not applied is The material is a dense body having a hardness of 50 ° to 70 °, and the material of the roll on the side in contact with the ink-coated surface on which the other ink is applied is a foam having a hardness of 20 ° to 40 °. Ink ribbon cassette.