JPH0751330Y2 - Inking device for small printers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a small type serial printer, and more particularly to an inking device of a serial printer having a plurality of stages of type wheels and capable of multicolor printing.

[Prior Art] Conventionally, as disclosed in JP-A-59-104966 and JP-B-59-32315, there has been disclosed a serial printer capable of multicolor printing.

Further, the ink ribbon used in the small parallel printer has a strip shape in which the upper row is arranged in red and the lower row is formed in black.

[Problems to be Solved by the Invention] However, in the above-mentioned disclosure patent, there is no disclosure regarding an inking device, for example, when a roll having ink with low lightness is arranged in the upper stage and a roll having ink with high lightness is arranged in the lower stage, When the low ink is bleeding, the ink drips and mixes with the lower ink, or the low-brightness ink applied to the upper print ring drips onto the lower print ring,
There is a problem that the print quality becomes poor at the time of printing and print quality deteriorates.

On the other hand, the ink ribbon does not have such a problem, but it is difficult to use for a small type serial printer.

The present invention has been made to solve such a drawback, and an object thereof is to inexpensively supply an inking device that enables high-quality printing.

[Means for Solving the Problems] The present invention is provided with an ink occlusion body in which print wheels having print characters arranged around them are arranged in multiple stages in the vertical direction, and press contact with the print characters of the print wheels to supply ink to the print characters. In an inking device for a small printer, in which the ink occlusion body has a plurality of colors,
It is characterized in that the ink occlusion bodies are arranged from the lower stage in the order of increasing lightness.

[Embodiment] FIG. 1 is a sectional view showing an embodiment of the inking apparatus according to the present invention, which is an embodiment assuming a case of the most general two-color printing. FIG. 2 is a sectional view of the inking device and the type wheel group.

In the figure, reference numeral 1 denotes an ink roll in which an ink occlusion body made of a foamable polymer material having elasticity is impregnated with ink having high lightness. Similarly, reference numeral 2 is an ink roll impregnated with an ink having a low lightness. Reference numeral 3 denotes an ink roll holding shaft into which the ink rolls 1 and 2 are incorporated. 3-on the ink roll axis
Reference character a denotes a brim portion that prevents the ink rolls 1 and 2 from coming into contact with each other, and is required to secure a gap that prevents the ink rolls from coming into contact with each other due to the deformation of the ink occlusion body due to the pressing on the type ring.
Further, 3-b is a brim that prevents the ink rolls 1 and 2 from slipping off the shaft. When the ink rolls 1 and 2 are incorporated into the ink roll holding shaft 3, the center hole is widened while deforming the ink occlusion body. Reference numeral 4 is an ink roll cover that holds an ink roll set incorporating 1, 2, and 3 in the drawing. The ink roll cover has a bearing portion for the ink roll holding shaft.

In FIG. 2, reference numeral 5 denotes an upper type ring which has a type on the outer circumference thereof and is wound around a type ring holder 7, and 6 denotes a lower type ring. A boss portion is formed in the center of the type wheel holder 7, and the type wheel holder 7 is rotatably and thrustably held on the type wheel holder 7 and a shaft 8-a protruding from a carriage 8 that moves an ink roll in the print digit direction. . The ink roll 1 has an upper printing wheel 5 and the ink roll 2 has a lower printing wheel 6 having substantially the same center value in the thrust direction. The printing wheel holding member 7 is moved in the thrust direction on the carriage 8 for switching the printing color during printing. Even if it moves, it moves in the thrust direction at the same time.

In the above-described structure, the ink rolls 1 and 2 have a constant pressure around the shaft 8-b on the carriage by the elastic force of the elastic portion 4-a integral with the type wheels 5 and 6 and the ink roll cover 4. The ink rolls 1 and 2 and the ink roll holding shaft 3 are rotated about the ink roll holding shaft 3 as the type wheel holding member 7 rotates, and ink is applied to the type wheel. In this state, the ink in the ink roll oozes and the ink drips from the ink roll 1 to the ink roll 2, or the ink applied to the type wheel hangs from the type wheel 5 to the type wheel 6 Color mixture occurs. Further, if the number of times of printing is increased, the ink may be scattered. However, in the case of the ink roll of the present invention, since the ink roll 1 containing the ink with high lightness is arranged in the upper stage, color mixture to the ink roll 1 side with high lightness can be prevented and the type wheel 5 for applying ink with high lightness can be prevented. You can also prevent the color mixture of the above ink. Further, the color mixture of the ink roll 2 containing the ink with low lightness or the ink with high lightness on the type wheel 6 side is unlikely to appear in the print quality due to the ink with low lightness.
As an example, in the case of extremely general red ink and black ink, when ink roll 1 contains red ink and ink roll 2 contains black ink, the black ink mixes with the red ink. Print quality is poor. According to the present invention, even if the black ink is prevented and the red ink is mixed, there is no problem in print quality.

In the embodiment, the ink roll composed of two stages and the type ring composed of two stages are described with the red ink and the black ink. However, the ink roll and the type ring are composed of three stages or more, and the ink is formed in the order of the lightness of the ink. It is a matter of the present invention to arrange the rolls and the ink having the lowest lightness at the bottom.

[Advantage of the Invention] As described above, according to the present invention, since the ink occlusion bodies are arranged from the lower stage in the order of decreasing brightness, the ink occlusion bodies arranged on the upper stage and the type wheel are arranged on the lower stage. It is possible to print on the recording paper with the initial specified brightness without mixing the ink from the printing type ring and the type ring, and the ink dripping from the ink absorber or the type ring placed in the upper stage mixed with the ink in the lower level. Even so, since the lower brightness of the ink,
The effect is small, the lightness does not change greatly, and it is difficult to appear in the print quality. Therefore, the relative difference in lightness is not significantly reduced, so that clear print quality is obtained.

As described above, providing the printer without deteriorating the printing quality has an effect that the printer having improved durability can be provided, and the practical effect of the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an inking device according to the present invention. FIG. 2 is a sectional view of the inking device and the type ring group. 1 ... Ink roll 2 ... Ink roll 3 ... Ink roll holding shaft 4 ... Ink roll cover 5 ... Letter ring 6 ... Letter ring 7 ... Letter ring holder 8 ... Carriage

Claims (1)

[Scope of utility model registration request] 1. A type wheel having letters arranged on its periphery is arranged in multiple stages in a vertical direction, and an ink occlusion body is provided which is in pressure contact with said type of said type wheel and supplies ink to said type, and said ink An inking device for a small-sized printer having occlusion bodies of a plurality of colors, wherein the ink occlusion bodies are arranged from the lower stage in the order of decreasing brightness.