JPS6027005Y2 - Inking mechanism of ink ribbon in printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inking mechanism for a printing device, and more particularly to an inking mechanism for a printing device that uses a nozzle that is optimal for applying ink sent from a pump to a transfer roller.

Conventionally, apparatuses shown in FIGS. 1 and 2 have been used to apply ink to a transfer roller.

FIG. 1 shows an inking mechanism using an ink application plate as a nozzle.

FIG. 2 shows an inking mechanism with radial pipe holes in the nozzle.

In each figure, 1 is an ink ribbon to which ink is applied;
2 is a transfer roller that applies ink to the ink printer 1;
4 is an ink application plate made of felt or open-cell sponge that applies ink to the transfer roller 2; 4 is a nozzle case that impregnates the ink application plate with ink; 5 is a tube that carries ink sent from the pump 6 to the nozzle case 4; , 7 is a nozzle having radial pipe holes 8, and 9 is a pipe for sending ink from the tube 5 to the nozzle 7.

Further, symbol A in the figure represents the ink application range on the surface of the transfer roller 2.

In FIG. 1, ink is applied as follows.

First, ink sent from the pump 6 is sent to the nozzle case 4 via the tube 5.

The ink application plate 3 sent to the nozzle case 4 is impregnated by capillary action.

Here, the ink application plate 3 is in contact with the transfer roller 2.

Therefore, the ink is applied to the transfer roller 2 via the ink application plate 3 by capillary action.

Next, the ink ribbon 1 and the transfer roller 2 are in contact with each other, and ink is applied to the ink ribbon 1.

Further, in FIG. 2, ink application is performed as follows.

First, ink is sent to the nozzle 7 via the tube 5 by the pump 6.

The ink is then conveyed by pipe 9 to radial pipe holes 8 .

Here, the ink is discharged from the radial pipe holes 8 and directly applied to the transfer roller 2.

Next, the ink is applied to the ink ribbon 1 by a transfer roller 2.

In the conventional apparatus, ink is applied to the ink ribbon by the inking mechanism as described above.

However, in the inking mechanism shown in FIG. 1, ink is applied using capillary action.

Therefore, it takes time until the ink coating plate 3 is sufficiently impregnated with ink.

As a result, if the ink discharge amount of the pump 6 changes, that is, if the printing amount of the printing device changes, it will take time for the amount of ink applied to the transfer roller 2 to change to the desired amount, resulting in poor responsiveness. Due to the poor quality, ink unevenness occurs on the ink ribbon 1, resulting in a disadvantage that good printing quality on paper cannot be obtained.

Further, paper dust and the like peculiar to the printing device get caught between the ink coating plate 3 and the transfer roller 2, and are then removed, but at this moment the ink coating plate 3 separates from the surface of the transfer roller 2, and the transfer roller 2
This has the disadvantage that the ink is not applied to the ink ribbon 1, causing ink unevenness on the ink ribbon 1.

Furthermore, the inking mechanism shown in FIG. 2 has the disadvantage that the contact surface between the nozzle 7 and the transfer roller 2 gets clogged with paper dust and the like peculiar to the printing device.

First of all, paper dust, etc. peculiar to the printing device is removed from the ink ribbon.
The particles adhere to the transfer roller 2 and are carried to the contact surface between the transfer roller 2 and the nozzle 7.

Next, as shown in FIG. 3a, paper dust and the like are collected by the nozzle 7 and grow into particles on the contact surface between the transfer roller 2 and the nozzle 7.

Here, there is no problem if the paper dust and the like collected by the nozzle 7 are removed by natural falling or the like.

However, in reality, as shown in FIG. 3a, paper dust and the like are caught in the contact surface between the transfer roller 2 and the nozzle 7, and as a result, the nozzle 7 makes uneven contact with the surface of the transfer roller 2.

Therefore, the ink is not applied well to the surface of the transfer roller 2 and the ink is not evenly applied to the ink ribbon 1.
Good paper print quality could not be obtained.

The purpose of this invention is to eliminate the above-mentioned drawbacks, and to realize an apparatus that can uniformly apply ink to a transfer roller, apply ink evenly to an ink ribbon, and obtain good printing quality on paper. .

The object of the present invention is to include an ink ribbon to which ink is applied, a transfer roller to apply the ink to the ink ribbon, a nozzle to apply the ink to the transfer roller, and an ink supply source to supply the ink to the nozzle. In the inking device, a thin film pad made of a material capable of retaining the ink is provided at the tip of the nozzle, and the nozzle is pressed in the normal direction of the transfer roller to apply the ink to the transfer roller. It is distantly related to the inking mechanism of the ink ribbon in the printing device.

Next, one embodiment of the present invention will be described with reference to the drawings.

FIGS. 4 and 5 are explanatory diagrams of one embodiment of the present invention.

In each figure, 10 is a pad with a thickness of about 1rrrIrL made of open-cell sponge or the like provided at the tip of the nozzle 11;
11 is a nozzle having a recess of about 0.5 mm at the tip; 12
is an ink ejection port.

In addition, other identical parts are given the same numbers.

Next, the operation will be explained.

First, the pad 10 provided at the tip of the nozzle 11 is pressed against the transfer roller 2 until its thickness is reduced to about half.

Next, the ink is sent to the nozzle 11 by the pump 6, and is ejected from the ink ejection port 12 into the recess at the tip of the nozzle 11, so that the entire pad 10 is quickly impregnated.

Therefore, even if the ink discharge amount of the pump 6 changes, that is, even if the printing amount of the printing device changes, the ink is applied to the transfer roller 2 and the ink ribbon 1 without delay.

Therefore, since ink unevenness does not occur on the ink ribbon 1,
It is possible to always keep the print quality constant when printing on paper.

In addition, as mentioned above, paper dust and the like that have been carried on the ink ribbon 1 and attached to the transfer roller 2 can be removed by positioning the nozzle 11 in the normal direction of the transfer roller 2,
By pressing the 0 onto the transfer roller 2, it can be removed effectively.

This is presumably due to the reasons explained below.

First, paper dust and the like adhering to the transfer roller are carried to the contact surface between the transfer roller 2 and the pad 10 in the direction of the arrow indicated by symbol A in FIG.

Next, paper dust and the like are not scraped off because the pad 10 is made of an open-cell sponge or the like, but are force-fed to the contact surface between the pad 10 and the transfer roller 2.

Next, paper dust, etc. are sent out from the location indicated by symbol B in the figure.

At this time, paper dust and the like do not adhere to the transfer roller 2.

This is because paper dust or the like gets caught in the holes of the pad 10 made of a material such as an open-cell sponge, so that the transfer roller 2 does not adhere to it.

Furthermore, paper dust and the like that are not attached to the transfer roller 2 and are caught in the holes of the pad 10 gradually elongate at the location indicated by symbol B in the figure, and then naturally fall and are removed.

Further, paper dust and the like are sent to the contact surface between the pad 10 and the transfer roller 2, but since the pad 10 and the transfer roller 2 are in pressure contact, the pad 10 never separates from the surface of the transfer roller 2, and therefore the ink transfer roller 2 without ink unevenness
is applied to.

This has been experimentally confirmed by the present inventors.

As explained above, according to the configuration according to the present invention, ink is evenly applied to the ink ribbon, and the printing quality on paper can always be kept constant.

Furthermore, paper dust and the like peculiar to printing devices can be removed, and ink unevenness due to paper dust and the like can be prevented.

[Brief explanation of the drawing]

Figure 1 shows an inking mechanism that uses an ink coating plate as a nozzle, Figure 2 shows an inking mechanism with radial pipe holes in the nozzle, and Figure 3 shows a case where the contact surface between the nozzle and the transfer roller is clogged with paper dust, etc. 4 and 5 are explanatory diagrams of an embodiment according to the present invention. In each figure, 1 is an ink ribbon, 2 is a transfer roller, 3
is the ink application plate, 4 is the nozzle case, 5 is the tube, 6
1 is a pump, 7 is a nozzle, 8 is a radial pipe hole, 9 is a pipe, 10 is a pad, 11 is a recessed nozzle, and 12 is an ink discharge port.

Claims (1)

[Scope of utility model registration request] An inking device comprising an ink ribbon to which ink is applied, a transfer roller to apply the ink to the ink ribbon, a nozzle to apply the ink to the transfer roller, and an ink supply source to supply the ink to the nozzle. A printing device characterized in that a thin film pad made of a material capable of retaining the ink is provided at the tip of a nozzle, and the nozzle is pressed in the normal direction of the transfer roller to apply the ink to the transfer roller. The inking mechanism of the ink ribbon.