JPS59123691A - Ink transfer type printer - Google Patents

Abstract

PURPOSE:The titled printer capable of supplying an ink to a coloring medium over a long period of time and maintaining a uniform impregnation ratio, wherein particulates of a liquid ink are jetted directly to a coloring medium at a fixed time interval synchronously with a printing signal. CONSTITUTION:A printing head 15 fitted to a carriage is provided with an ink-supplying device 21 and an ink tank 22, and a plurality of nozzles 26 surrounded by a piezoelectric displacement element 25 are faced to a woven fabric ribbon 18. The carriage is reciprocated, the ribbon 18 is simultaneously driven, and a driving signal is given to the head 5. A supplying pulse S.P is generated at a fixed time interval synchronously with a printing pulse P.P, and the element 25 is operated to generate ink particulates from the nozzles 26.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a method of forming a matrix by interposing a colored medium such as a woven fabric ribbon or felt ring impregnated with liquid ink, or a cylindrical rubber member foamed into open cells. The present invention relates to an ink transfer type printing device for transferring and recording patterned characters and needle line type pixel constituent characters on a coined plain paper.

Technical Background and Problems Conventionally, there is a system using a woven fabric ribbon as a coloring medium, as shown in FIG. 1, in which the woven fabric ribbon is completely replenished with liquid ink. First, an ink holder (2) is housed inside an ink cartridge case (1). This ink holder (2) is made of 30,000 to 40,000 monofilaments made of polypropylene or the like and hardened to a low density by applying heat to the outer periphery so as not to lose its shape. And the ink cartridge case (1)
Ink transfer chip (3) with felt member on one end surface.
is mounted, and this ink transfer chip (3) is in contact with the transfer roller (4). This transfer roller (4) is joined to a textile ribbon (5).

Furthermore, the one shown in FIG. 2 is provided with an ink holder (6) made of urethane foam and a transfer chip (7) made of urethane foam of different density.

In such a cartridge type, the ink supply system is closed even when the printer is stopped, so the ink is transferred to the transfer chip (3) (7) ' (i = woven fabric ribbon (5)
easily oversupplied. In particular, if the temperature exceeds 40°C, ink may blow out from the cartridge case (1) or the woven fabric ribbon (5) may
There are many problems such as water being washed away.

Next, although the ink supply device for a cylindrical type line printer is not particularly shown, a sponge roller made of a polymeric material is vacuum-impregnated with ink and is placed opposite the entire width of the printing stand. It has a structure in which ink is squeezed out and supplied to the convex surface of the type in an appropriate amount. With such a structure, the sponge roller can hold only about 1% of the open-cell foam and discharge it. This is because the ink roller seals the ink using vacuum pressure, so the holding force exceeds the force of pushing it out due to contact pressure with the printing stand.

In any of the above-mentioned formats, the ink # transferred to the paper is regulated by the density difference of the intermediate medium, the cross-sectional area of the transfer chip, or the ink confinement pressure, and only a certain amount of ink can be ejected. It has some drawbacks that cannot be avoided.

OBJECTS OF THE INVENTION The object of the present invention is to provide an ink transfer type printing device that can replenish ink to a colored medium over a very long period of time and can continuously maintain a uniform impregnation rate. shall be. 'Summary of the Invention The present invention directly injects fine particles of liquid ink onto a colored medium at regular intervals in synchronization with a print signal, so that the amount of ink replenishment is commensurate with the amount of consumption. In addition, by replenishing liquid ink, the ink can be replenished for an extremely long period of time.

Embodiment of the Invention A first embodiment of the present invention will be described with reference to FIGS. 3 to 7. First, the printer (8) has a paper feed knob (9) on the right side, a paper presser lever (1 (ll) on the upper left side, and has a normal appearance, and a variable resistor (not shown) on the left side of the front. Two guide shafts Q21 (+3) are installed in parallel in the printer (8), and these guides @ (+2) (13 has carriage α
The shaft is installed so that it can move back and forth.

This carriage 04) has a needle line type pixel configuration, that is, a print head α of a dot printer is attached. A woven fabric ribbon (18) serving as a light-colored medium is provided which is wound around rollers (+6) αη and stretched in accordance with the movement of the print head αQ, and this woven fabric ribbon a barrel is connected to the ribbon cartridge a9. Internal pressure is stored. A drive roller (2o) is provided within this ribbon cartridge α■.

Therefore, the ink replenishing device 0 is attached to the carriage 04).
υ is installed. First, an ink tank (22) is provided, and this ink tank (2 has a tube (23) '!r
An ink chamber (24) is connected to the ink chamber (24), and a plurality of nozzles (26) surrounded by a plurality of piezo displacement elements (c) are connected to this ink chamber (2).
26) is installed in parallel with the nose (5) of the print head 0!51 and faces the woven fabric ribbon O1O.

Note that (c) is plain paper to be transferred.

In such a configuration, the carriage (14) is reciprocated, the woven fabric ribbon (lal k) is driven, and
Printing is performed by applying a drive signal to the print head αω.

Then, as shown in FIG. 6, printing pulses P, P are generated at regular intervals, and replenishment pulses S, P are generated once every four printing pulses P, P. By fully adjusting the contrast adjustment knob 01), the supply pulses S and P change the energization time as 11 and χ. Now, suppose that pulses s, , p of energization time 11 are generated, and the piezo displacement element C2ω operates to generate ink droplets from the nozzle (2G). The pot body of this ink droplet changes depending on the amount of displacement of the piezo displacement element (c). For example, if pulses s, , p of energization time ft are given, the volume of the ink droplet becomes large, and it moves toward the woven fabric ribbon αQ. Ink supply amount increases.

Now, the woven fabric ribbon 0 barrel using 9 pin neat dots as the print head α4 is 13 mm wide and 11? F! When a long type is used, the relationship between the number of prints and the print density is the seventh
The result will be as shown in the figure. The printing density on the vertical axis is p, c, s (
Print Contrast Signal). Therefore, A is related to the above example, P, C, 87, 5-9
It is X10. Further, B is the conventional cartridge type shown in FIGS. 1 and 2, and C is the case where ink is not replenished.

Next, a second embodiment of the present invention will be fully explained based on FIG. In this embodiment, the ink replenishing device (21) is
4) is not installed in the tube c! 3) Nozzle top with all branches and piezo displacement element (25) installed)
The part is located near the end of the woven fabric ribbon U mark. This woven fabric ribbon 0 (to) is the left and right spool sheet 9)
It is wound around and driven back and forth.

In each of the above examples, a woven fabric ribbon was used, but the lifespan of a woven fabric ribbon pre-impregnated with ink is evaluated based on the number of prints required until the ink density transferred to the paper is acceptable. (life of ink) and number of prints required until the fabric is destroyed by printing pressure (life of fabric)
There are two ways. Therefore, when comparing the two, the lifespan of the fabric is usually 10 to 15 times longer. Therefore, by replenishing ink as mentioned above, the woven ribbon can be used until the end of the fabric's lifespan.
This will extend the lifespan by 10 to 15 times.

Next, a third embodiment of the present invention will be described based on FIG. 9. This embodiment relates to a line printer, and the marking stand C
There is a sheet of plain paper (
A sponge-like rubber roller C, which serves as a coloring medium impregnated with ink, is connected to the stamp stand. A cover 34) is provided around the rubber roller C33). Therefore, a plurality of nozzles are connected to an ink pressure pump (36
) ' is connected to the tank (37).

A power source 138) is connected between the nozzle c3m and the cover (b), with the nozzle C351 as a positive electrode and the cover c34)' as a control electrode, thereby forming an ink replenishing device side.

In this state, the ink pressure pump (36) pumps 1 ink.
Apply pressure to 0 to 1s Kg/-, apply IMH2, and apply a replenishment signal voltage of O to 500V to the nozzle.
By applying the full amount of ink, ink is ejected from the nozzle Oω in the form of a spray, and is supplied over a wide range to the rubber roller (c). Then, the supply amount is adjusted by controlling the supply signal voltage according to the printing speed. The cover (34) also serves as an ink scattering prevention cover, and excess ink is returned to the tank (37). Then, the ink adhering to the printing stand G30) is removed from the paper C3 according to the drive of the hammer Gυ.
transcribed.

Effects of the Invention The present invention, as described above, directly injects all fine particles of liquid ink onto the colored medium at regular intervals in synchronization with the print signal, so that the amount of ink replenishment is commensurate with the amount of consumption. It can also be used as a liquid ink.
Ink can be replenished over an extremely long period of time by charging the ink, and ink can be easily jetted by using a piezo displacement element.
The amount of ink to be ejected can be easily controlled by adjusting the energization time, and reasonable replenishment can be achieved by mounting the ink replenishing device on the carriage that holds the entire print head.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing a conventional cartridge type replenishing device, FIG. 3 is a perspective view showing the first embodiment of the present invention, FIG. 4 is a plan view of the inside, and FIG. 5 is a main view. Fig. 6 is a timing chart, Fig. 7 is a graph showing the relationship between the number of prints and print density, Fig. 8 is a plan view showing the second embodiment of the present invention, Fig. 9 FIG. 3 is a plan view showing a third embodiment of the present invention. 11...knob, 14...carriage, 15...
Print head, 18... Woven fabric ribbon (colored medium), 21
... Ink supply device, 22 ... Ink tank, 24
... Ink chamber, 25 ... Piezo displacement element, 26 ...
・Nozzle, 28... Plain paper, 29... Spool, 3
3... Rubber roller (coloring medium), 35... Nozzle. 39...Ink supply device Applicant: Tokyo Electric Co., Ltd., Konna Zushi1jmu, 3, Figure 1, No. U Ugohe 5, Proceedings Amendment (Sponsored) Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office 1 Indication Patent Application No. 57-232012 2 Name of Invention Ink Transfer Printing Device 3 Relationship with 141 Amendments Patent Applicant 4 Agent Agent 〒107. 1 ヮ, Tokyo Minami-Aoyama 5 r+] 9-15-Yumi Kyodo Building (Shin-Aoyama) Telephone 409-4535 Name 72
11 Patent Attorney Akira Aiki 5 Daily Order of Amendment - 1'fili Original Subject Specification 1 Drawing 7 Contents of Amendment Attachment 9 Regarding this application, the description and drawings are amended as follows. Note 1: In the specification, the phrase "joined" on page 4, line 3 is amended as follows. ``They are contacted with an appropriate contact pressure.'' 2. In the specification, ``This printing pulse occurs.'' on page 7, line 14 is corrected as follows. [However, for example, this printing pulse" 3. In the specification, "joined" on page 9, line 18 is corrected as follows. "They are in contact with an appropriate contact pressure." 4. In the drawings, Figure 4 has been corrected as shown in the attached sheet. (The indicated position of code 21 has been changed.) 5. In the drawings, correct Figure 5 as shown in the attached sheet. (The indicated position of code 25 has been changed.)

Claims (1)

[Scope of Claims] 1. In a device in which matrix type or needle-line type pixel constituent characters are transferred and recorded on plain paper by coining, a colored medium impregnated with liquid ink and held therein is printed at regular intervals in synchronization with a print signal. An ink transfer type printing device characterized in that an ink replenishing device is provided for directly ejecting fine particles of the liquid ink at each time. 2. The ink transfer type printing device according to claim 1, wherein the ink replenishing device is formed by an ink tank, an ink chamber equipped with a plurality of piezo displacement elements, and a plurality of nozzles. 3. In the case of matrix type or needle-line type pixel composition characters that are transferred and recorded on plain paper, pulses synchronized with the print signal are sent to the piezo displacement element at regular intervals on a colored medium that is impregnated with liquid ink and retained. An ink transfer device characterized in that an ink replenishment device is provided for directly ejecting fine particles of the liquid ink from the nozzle by applying the pulse, and a contrast adjustment knob is provided for adjusting the amount of ink replenishment by changing the energization time of the pulse. type printing device. 4 In cases where printing is performed by transferring and recording onto plain paper using matrix type or needle-line type pixel composition character full pressure stamp, pulses synchronized with the print signal are applied to the piezo displacement element at regular intervals on the colored medium impregnated with liquid ink. In this way, an ink replenishment device that directly injects fine particles of the liquid ink from a nozzle is provided, and the colored medium stretched on the left and right spools is wound so as to face the plain paper, and the nozzle portion of the ink replenishment device is An ink transfer type printing device characterized in that the ink transfer type printing device is provided near the left and right end portions of the colored medium. 5. A print head with a needle-line pixel configuration is attached to a carriage that moves back and forth in opposition to plain paper, and a colored medium that is fully impregnated with liquid ink is provided along the direction of movement of the print head, and the coloring medium is kept constant in synchronization with the print signal. An ink transfer type printing device characterized in that an ink replenishing device for directly jetting fine particles of the liquid ink onto the colored medium at intervals is mounted on the carriage.