JPS60264262A - Ink dot printer - Google Patents

Abstract

PURPOSE:To enable good printing from the point of time immediately after the beginning of printing, by stopping a printing head at the position shifted from a recording medium at the start time of printing and contacting a needle with the stop position to absorb ink. CONSTITUTION:A printing head 7 is stopped at the stop position 4 provided to an ink absorbing apparatus 21 at the start time of printing and a needle 10 is driven by a drive part 8 so as to be contacted with the paper 22 of the ink absorbing apparatus 21. The high density ink 12 held to the leading end part of the needle 10 is absorbed by the paper 22 and, because the paper 22 has high water absorbability, the ink 12 is absorbed certainly and rapidly. When a carriage 6 is moved by a movement apparatus and opposed to recording paper 2, new appropriate ink 12 is supplied to a slit 19 and the ink held to the needle 10 comes to appropriate density and good printing is performed to the recording paper 2 from the point of time immediately after the beginning of printing.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an ink dot printer that applies ink held in a needle to a recording paper in the form of dots, and forms characters etc. using a collection of these dots. be.

Technical background of the invention and its problems 1 - Conventionally, in this type of device, an impregnated member impregnated with ink is pressed against the tip of the needle, or an ink film is formed using the hair f phenomenon. There is a method in which an ink film is formed using magnetic force to supply ink to a needle, and a print head having such a needle is provided so as to reciprocate along the recording paper.

However, in the impregnated member 1 in which an ink film is formed by capillary action, ink always exists near the needle +1, so if printing is not performed for a long period of time, the ink concentration may increase or the ink may become dry. , the printout may become blurred or become impossible to print at the beginning of printing. Additionally, movement of the needle may be inhibited.

Furthermore, in a device that uses magnetic force to form an ink film, if printing is not performed for a long period of time, the formation of the ink film can be canceled by weakening the magnetic force or the like.

However, since the ink attached to the needle cannot be removed, it still has the same drawbacks as mentioned above.

2-Object of the Invention The object of the present invention is to provide an ink dot printer that can perform good printing on a recording medium immediately after printing starts.

SUMMARY OF THE INVENTION This invention provides a stop position where the print head is stopped at a position away from the recording medium when printing starts, and a needle driven by a drive unit comes into contact with this stop position to remove the ink held by the needle. Since an ink absorbing device is installed, high-density ink is absorbed and consumed by the ink absorbing device, and new ink in an appropriate state is deposited on the recording medium.This allows the recording medium to print well immediately after printing starts. It is designed to allow for accurate printing.

Embodiments of the Invention A first embodiment of the present invention will be explained based on FIGS. 3 is attached to the main body case 1. A stop position I-4, which will be described later, is provided at a position away from the recording paper 2 at the time of starting printing. The main body case 1 includes the platen 3.
A pair of guide shirts 1-5 are attached along the axial direction. One end of these guys 1-shaft 5 extends into position 4 at said stop. A carriage 6 is slidably attached to the guide shirts I-5. This carriage 6 is connected to a movable bag W (not shown), and two print heads 7 are mounted thereon. This print head 7 has a drive section 8 and a guide section 9 formed integrally. A plurality of magnets and an armature (none of which is shown) facing the magnets are arranged in a circumferential manner and housed in the drive part 8, and a plurality of needles 10 are housed in the guide part 9. The rear ends of these needles 10 are in contact with said armature, and these needles 10
are arranged in a vertical line with their tips facing the platen 3 side.

Further, a cassette 1-11 is detachably attached to the print head 7. This cassette l-11 has 12 ink
An ink tank 13 storing ink and an ink guide 14 extending downward are integrally formed. This ink guide 14 has a front plate 15 and a rear plate 16, and a gap 17 formed by these front plate 15 and rear plate 16 has a width that can suck the -r ink 12 by capillary action. It is defined as an ink passage 18. The needles 1 are attached to these front plate 15 and rear plate 16.
A sulin 1-19 is formed where the tip of the 0 is located. An ink film 2o is formed on these rinses 19.

The drive section 8 of the print head 7 is set to drive the needle 10 from the stop position 4 at the start of printing. Further, an ink absorption device 21 is attached to the main body case 1 so as to be located at the stop position 4 and on an extension line of the platen 3 in the axial direction.

This ink absorbing device @ 21 includes a long paper 22 with high water absorbency such as blotting paper and a roll 23 around which this paper 22 is wound.
It depends on this.

Next, a feeding device 24 for feeding the paper 22 five times is attached to the main body case 1. This feeding device 2
Reference numeral 4 includes a winding roll 25 for winding the paper 22, a take-up roll 26 for winding the paper 22, a guide plate 27 for guiding the paper 22, and rollers 28, 29. This feeding device 24 is set to feed the paper 22 by a length equal to or greater than the height of the tip of the needle 10, and is driven every time printing starts or after printing starts a certain number of times. It is set as follows.

In such a configuration, at the start of printing, the print head 7 is stopped at the stop 1-4 position where the ink absorption device 21 is provided.
Since the needle 1o is driven by the drive unit 8,
The needle 1o comes into contact with the paper 22 of the ink absorbing device 21. As a result, the high-density ink 12 held at the tip of the needle 10 is absorbed onto the paper 22. Since this paper 22 has high water absorption, the ink 12 can be applied reliably and
Absorbed quickly.

Next, when the carriage 6 is moved by the moving device and the print head 7 faces the recording paper 2, the appropriate ink 12 is newly supplied to the 6-rings 1 to 19, so that the ink is held in the needle 10. The ink 12 has an appropriate density. As a result, good printing is performed on the recording paper 2 immediately after printing.

Also, the paper 22 that has absorbed the ink 12 is fed by +3AF.
Good ink 1 is sent more automatically to t24.
The suction state No. 2 is automatically maintained. Therefore, there is no need to send the paper 22 each time, making maintenance easier. Since the paper 22 is fed intermittently, such as every time printing starts or after a fixed number of printing starts, the paper 22 is effectively used.

Next, a second embodiment of the present invention will be described based on FIGS. 4 and 5. Components that are the same as those in the first embodiment described above are designated by the same reference numerals, and description thereof will be omitted. This embodiment is provided with an ink absorbing device 32 consisting of a felt 31 attached to the front surface of any of the holding members 30, and this ink absorbing device 32 generates a negative pressure to make the interior of the felt 11 under if1 a negative pressure state. ! 1: This is the one in which the equipment m33 is connected. This negative 7-pressure generating device 33 has a vent hole 34 communicating with the front surface thereof formed in the holding member 10 to use the holding member 30 as a suction port body 35, and the suction port body 35, etc., a vacuum pump 36, These suction units 35 are made up of a pipe 37 that communicates with the vacuum pump.

In such a configuration, the high-density ink 12 is absorbed by the felts 1-31. Furthermore, since the felt 31 is under a negative pressure state by the negative pressure generating device 33, the ink 12 is quickly absorbed.

Moreover, since this ink 12 is less likely to remain on the felt 1-31 due to negative pressure, the felt 3 maintains a good absorption state over a long period of time, thereby facilitating maintenance.

In addition, in the first embodiment, a circle 41:-shaped roll 23 is used.
Although the long paper 22 is wound around the roller, small pieces of paper may be attached to a roll made of an elastic material and having a prismatic shape.

Further, in the second embodiment, felt 31 was used as the water absorbing member, but tow may also be used.

In these embodiments, the ink tank 13 of the cassette 11 is positioned at the upper level and the ink guide 14 extends downward, but as shown in FIG. Alternatively, the ink guide 40 may be positioned such that the ink guide 40 extends upward.

Effects of the Invention As described above, the present invention provides a stop 1-position where the print head stands still at a position away from the recording medium at the start of printing, and the print head contacts the needle driven to this stop position and is held by the needle. Since an ink absorption device is provided to absorb the ink that has been absorbed, high-density ink is absorbed by the ink absorption device, and the ink in an appropriate state adheres to the recording medium, allowing for good printing immediately after printing on the recording medium. It is something that can be done.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a side view, and FIG. 3 is a partially cutaway side view, and FIG. Figures 4 and 9-5 show a second embodiment of the invention, in which Figure 4 is a perspective view, Figure 5 is a partially cutaway side view, and Figure 6 is a view of another cassette. It is a side view which shows an example with a part notched. 2... Recording paper (recording medium), 4... Stop position, 7 Print head, 8... Drive unit, 10... Needle, 12
...Ink, 21.32...For ink absorption device Applicant Tokyo Electric Co., Ltd. ((,P10-

Claims (1)

[Claims] A print head is provided that has a plurality of needles that hold ink at their tips and a drive unit that selectively drives these needles back and forth. At times, a stop position is provided at a position away from the recording medium to keep the print head stationary, and an ink absorbing device is provided with which the needle driven to this stop position comes into contact and absorbs the ink held by the needle. An ink dot printer characterized by: