JPS6331978Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an inking device for an ink ribbon in a printing device, and in particular controls the rotational speed of a transfer roller according to the amount of ink discharged, thereby constantly applying ink to the ink ribbon. Concerning proper application methods.

Conventional inking devices include a system in which the amount of ink ejected is changed depending on the number of prints by the printing device, but the rotational speed of the transfer roller is always constant regardless of the amount of ink ejected. As a result, if the ink coating on the transfer roller surface becomes thick, the ink will drip due to its weight and cannot be applied to the ink ribbon properly, and if the ink coating on the transfer roller surface becomes thin, the ink will not be able to be applied to the ink ribbon. Since this method is not carried out properly, it has the disadvantage that the printing quality on the recording paper is not constant.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, that is, to keep the ink film thickness on the surface of the transfer roller constant even when the ink discharge amount changes, so that the appropriate amount of ink is always applied to the ink ribbon, and the recording paper is The goal is to improve the printing quality.

The object of the present invention is to provide an ink ribbon impregnated with ink and transferred to a printing section, an ink ribbon driving means for driving the ink ribbon, a transfer roller for applying ink to the ink ribbon, and a transfer roller for rotationally driving the transfer roller. In a printing device that includes a roller driving means, a nozzle that applies ink to the transfer roller, an ink supply source that supplies ink to the nozzle, and an ejection amount control circuit that controls the amount of ink ejected from the nozzle, the rotational speed of the transfer roller An inking device for an ink ribbon in a printing device, characterized in that the rotational speed of the transfer roller is increased or decreased in accordance with an increase or decrease in the amount of ink ejected from the nozzle. achieved.

The present invention will be explained in detail below.

FIG. 1 is a schematic explanatory diagram of a conventional inking device. In the figure, 1 is an ink ribbon, 2 is a transfer roller that applies ink to the ink ribbon 1, and 3 is a transfer roller that applies ink to the ink ribbon 1.
4 is a nozzle that applies ink to the transfer roller 2, 4 is a pump that sends ink to nozzle 3, 5 is a motor that drives pump 4, and 6 is a unit that counts the number of prints and controls the motor 5 to control the amount of ink discharged. The control circuit 7 is an ink cartridge which is an ink supply source.

Ink is applied to the ink ribbon 1 by supplying the ink from the ink cartridge 7 to the nozzle 3 by the pump 4 controlled by the control circuit 6, applying the ink to the transfer roller 2 by the nozzle 3, and applying the ink to the transfer roller 2.
This is done by coating the ink ribbon 1 with the ink.

At this time, the amount of ink ejected from the nozzle 3 is set by the control circuit 6 in proportion to the amount of printing, but since the rotation speed of the transfer roller 2 is always constant, the ink coating film applied to the surface of the transfer roller 2 is The thickness varies, and when applying ink to the ink ribbon 1, if the ink coating becomes thick, the ink may drip due to the weight, or if the ink coating becomes thin, the transfer roller 2 may be brought into contact with the ink ribbon 1. However, since the ink is not applied well, the print quality on the recording paper is not constant.

FIG. 2 is an explanatory diagram of an inking device for an ink ribbon in a printing device devised to eliminate the above drawbacks.

In the figure, 1 is an ink ribbon, 2 is a transfer roller, 3 is a nozzle, 4 is a pump, 5 is a motor, and 6
is a control circuit, 7 is an ink cartridge, 8 is a pump shaft that transmits the rotation from the motor 5 to the pump 4,
9 is a transfer roller shaft for rotating the transfer roller 2, 1
0 is a timing belt that connects the pump shaft 8 and the transfer roller shaft 9.

According to this embodiment, as can be seen from the figure, the pump shaft 8 and the transfer roller shaft 9 are connected to the timing belt 10.
Since the transfer roller shaft 9 is connected to the transfer roller shaft 9, the rotation speed of the transfer roller shaft 9 can be changed according to the rotation speed of the pump shaft 8, that is, the amount of ink discharged from the nozzle.

As a result, the amount of ink discharged from the nozzle 3 is variably controlled based on the number of rotations of the pump shaft 8, which is controlled by the control circuit 6 depending on the number of prints of the printing device. Furthermore, since the rotational speed of the transfer roller shaft 9 corresponds to the rotational speed of the pump shaft 8, the amount of ink discharged and the circumferential speed of the transfer roller 2 are in a proportional relationship, and even if the amount of ink discharged changes, the transfer roller 2 The thickness of the ink coating on the surface can always be kept constant.
Therefore, the ink can be properly applied to the ink ribbon 1, and the printing quality of the recording paper can be improved.

FIG. 3 shows another embodiment of the invention. 2nd in the diagram
Places that are the same as those in the figure are given the same numbers.

The difference from FIG. 2 is that there is no timing belt 10, and the transfer roller shaft 9 and pump shaft 8 are integrated into a shaft 11.
The reason is that Note that the operations and functions of each part are the same as those in the above-described embodiments, so description thereof will be omitted here.

According to this embodiment, since the shaft is integrally formed, connecting members such as the timing belt 10 are not required, the number of parts is reduced, the structure is simplified, and manufacturing costs can be reduced.

As explained above, according to the present invention, the transfer roller 2
Since the thickness of the ink film on the surface can always be maintained at an appropriate amount regardless of the amount of ink discharged, ink can be applied normally to the ink ribbon 1, and very good printing quality on recording paper can be obtained. I can do it.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that similar effects can be obtained by replacing the timing belt 10 with a gear coupler or the like in FIG. 2, for example.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional inking device. FIG. 2 is an explanatory diagram of an embodiment of the inking device of the present invention. FIG. 3 is an explanatory diagram of another embodiment of the present invention. In the figure, 1 is an ink ribbon, 2 is a transfer roller, 3 is a nozzle, 4 is a pump, 5 is a motor, and 6
7 is a control circuit, 7 is an ink cartridge, 8 is a pump shaft, 9 is a transfer roller shaft, 10 is a timing belt, and 11 is an integrated shaft.

Claims (1)

[Claims for Utility Model Registration] An ink ribbon impregnated with ink and transferred to a printing unit, an ink ribbon driving means for driving the ink ribbon, a transfer roller for applying ink to the ink ribbon, and a rotation drive for the transfer roller. A printing device comprising: a transfer roller driving means for applying ink to the transfer roller; a nozzle for applying ink to the transfer roller; an ink supply source for supplying ink to the nozzle; and an ejection amount control circuit for controlling the amount of ink ejected from the nozzle. Inking of an ink ribbon in a printing device, comprising means for variably controlling the rotational speed, the rotational speed of the transfer roller being increased or decreased in accordance with an increase or decrease in the amount of ink ejected from the nozzle. Device.