JPH049172Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an ink ribbon cassette used in printers, typewriters, etc., and in particular relates to an ink ribbon cassette of a type that uses an ink cartridge for storing ink. be.

[Prior Art] In conventional ink ribbon cassettes that use an ink cartridge, the ink transfer material of the ink cartridge is in constant contact with a transfer roller, and the transfer roller is in contact with the ink ribbon or is in contact with the ink ribbon. Ink is supplied to the ink ribbon via two transfer rollers. In either case, the transfer roller in contact with the ink transfer material is made of a liquid-absorbing elastic material, such as porous urethane, so that it can easily receive ink from the ink transfer material.

[Problems to be solved by the invention] In such conventional devices, for example, when printing is interrupted and the rotation of the transfer roller stops, ink seeps into the transfer roller even during the stoppage, causing excessive load on the transfer roller. Ink accumulates. Then, when printing is started again and the transfer roller rotates to transfer the ink to the ink ribbon, an excessive amount of ink is supplied to the ink ribbon, resulting in an excessively dark print. Furthermore, uneven shading sometimes occurred in the printed characters. Particularly if the transfer roller is left stopped for several days, the ink seeping from the ink transfer material may impregnate the entire transfer roller, and the ink ribbon in contact with the transfer roller or another transfer roller may be constantly impregnated with ink that seeps from the ink transfer material. Ink is supplied, and a very large amount of ink is partially attached to the ink ribbon or another transfer roller. Therefore, uneven printing occurs, such as the ink density becoming extremely thick in some areas at the start of printing.

[Means for Solving the Problems] This invention solves the drawbacks of the above-mentioned prior art, and the ink is transferred from the ink transfer material protruding from the ink cartridge through the first transfer roller and the second transfer roller. The configuration is such that ink is supplied to the ribbon, and the first transfer roller is made of unicellular urethane that has non-liquid absorption properties.

[Function] Porous urethane used in conventional transfer rollers has open cells inside and is a material with extremely high liquid absorption. On the other hand, the unicellular urethane used in the first transfer roller of the present invention does not have open cells inside it, but has small air bubbles that exist independently.
No liquid absorption. Therefore, there is no risk that the first transfer roller will be impregnated with excess ink upon being supplied with the ink transfer material.

[Example] Next, an example of this invention will be described.

An ink cartridge 2 is set in an ink ribbon cassette 1. The ink cartridge 2 is detachable by a presser spring 3. An ink storage body 4 and an ink transfer material 5 are housed in the ink cartridge 2, and the tip of the ink transfer material protrudes. A first transfer roller 8 and a second transfer roller 9 are rotatably supported between the upper case 6 and the lower case 7. The first transfer roller 8 is formed from a unicellular urethane sponge which is a non-liquid absorbing elastic material, and does not hold excessive ink. The second transfer roller 9 is made of polyacetal resin or the like, and has narrow jagged grooves 9a formed in the vertical direction on its outer circumferential surface.

In FIG. 1, 10 is a rotating shaft rotated by a motor (not shown). Reference numeral 11 denotes a presser roller, and the ink ribbon 12 passes between the second transfer roller and this presser roller 11.

Due to the rotation of the rotating shaft 10, the second transfer roller 9
Then, the first transfer roller 8 is rotated, and the ink ribbon 12 is fed while being supplied with ink.

[Effects] According to the present invention having the above configuration, since the first transfer roller that comes into contact with the ink transfer material is made of unicellular urethane which is a non-liquid absorbing elastic material, ink is not impregnated inside. When printing is interrupted, the second ink
There is no risk that the ink will be supplied to the transfer roller, and excessive ink supply to the ink ribbon can be prevented. and,
Even if a large amount of ink adheres to the outer peripheral surface of the first transfer roller, the ink is leveled when transferred to the second transfer roller, making the ink amount uniform, and in this state, the second transfer roller Since the ink is supplied to the ink ribbon from the printer, the ink is evenly transferred to the ink ribbon and uneven printing does not occur. As described above, according to the present invention, even if printing is stopped for a long period of time, excessive ink is not supplied and uneven printing does not occur. Further, since the first transfer roller has elasticity, there is no fear of causing wear to the ink transfer material, and the life of the first transfer roller can be extended.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a vertical sectional view of the main part, FIG. 2 is a plan view of the ink ribbon cassette with the upper case removed, and FIG.
FIG. 3 is an enlarged front view of the transfer roller of FIG. DESCRIPTION OF SYMBOLS 1... Ink ribbon cassette, 2... Ink cartridge, 5... Ink transfer material, 8... First transfer roller, 9... Second transfer roller.

Claims (1)

[Claims for Utility Model Registration] An ink cartridge, an ink transfer material protruding from the ink cartridge, a first transfer roller in contact with the ink transfer material, and a second transfer roller in contact with the first transfer roller. An ink ribbon cassette comprising: a transfer roller; and an ink ribbon in contact with the second transfer roller, wherein the first transfer roller is made of unicellular urethane having non-liquid absorption properties.