JPS60219061A - Liquid injection recording head - Google Patents

Abstract

PURPOSE:To obtain the titled head for which the assembly and exchange thereof are easy and the recovery mechanism of the bad discharge of liquid drop is not required, by a method wherein a liquid discharging component is united with the base having plural electric resistors, fixed to a keeping component and a liquid bag is fixed to another side surface of the keeping component. CONSTITUTION:The base 17 to which plural electric resistors 17a are installed is jointed to a liquid discharging component 16 by adhesives and the base 17 is jointed to a keeping component 18 by adhesives, too. The liquid bag 19 in which liquid is put, is jointed to the keeping component 18 and the liquid in the liquid bag 19 is supplied to the chamfer part of the liquid discharging component 16 via the liquid feeding pore 18b of the keeping component 18 and the liquid feeding pore 17c of the base 17.

Description

[Detailed Description of the Invention] [Technical/Ej Field] The present invention relates to a recording head for l(k) jetting, and furthermore,
1～kuha! (This relates to a simple liquid jet recording device that eliminates the need for a single droplet non-ejection recovery mechanism and allows for recording bend exchange.)

[Prior Art] The use of liquid jet recording devices has been increasing in recent years because of the simple structure of the recording head, the ability to easily perform color recording, and the ability to perform high-speed recording.

On the other hand, the disadvantages of the liquid jet recording method include ejection failure and clogging of the liquid ejector 110-1 due to non-emission of volatile components of the liquid in the static ejection port during the recording operation body 1.

In conventional static jet recording devices, in order to compensate for the drawbacks described in 1-1, the camping means for controlling the liquid discharge 11 is submerged,
Alternatively, a recovery pump means is provided to remove the highly viscous liquid near one liquid discharge port.

However, in a recording device in which the camping means and the recovery pump means are manually operated by the user, the user is required to perform all operations in +iii before starting the recording operation, making the recording device very inconvenient to use. There was a drawback that it became.

On the other hand, a device in which the operation is electrically controlled using a power source such as a motor or a Qm plunger is more convenient than the above device, but at least a power source and a control circuit are added to the recording device. Furthermore, there is a drawback that the cost of the recording device increases.

Also, by performing idle ejection unrelated to recording at fixed time intervals immediately before the recording device starts recording operation and while the recording operation is paused! Techniques have been proposed in the past to prevent the liquid from becoming highly viscous in the combined discharge 1.
This technique had the disadvantage that liquid consumption increased regardless of recording.

[Objective] The present invention has been made to eliminate the following drawbacks of the conventional technology.In addition, the present invention has a structure that is easy to assemble and replace in a cylinder, and eliminates the need for a droplet non-ejection recovery mechanism. One objective is to provide a combined jet recording head.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

Figure 1 shows the configuration of the axillary injection recording device according to the present invention.
Only the colors of the four bodies are different, and the other 61 construction heads are the same record head. For example, the bend 1a contains black ink, and the head 1b contains red ink. There is a hook part 1c at the front end of the hent la and lb ifj.

IIy lower γ? Rtd and 1e are provided.

The one indicated by code 2 is a carrier and has a hook Fe1t 2.
A and 1b are provided with a hook part 1c that engages with the hook part 2a and the carrier sheet 2 is inserted.
The function is fixed to exchange I+).

To remove the recording head from the carriage 2, use the hook f.
lli 2 While rotating a in the direction of the arrow, hold the handle rx
++ t Raise the handle part 1e upward with your fingertips
Just give it to your child.

The one indicated by code 3 is a flexible cable connected to head 1a.
and 1b are electrically connected to an electric control circuit (not shown).

The carriage 2 described in n1j is slidably attached to guides 4 and 5, and is connected to a drive pulley 7 provided on the shaft of a motor 6 provided on the - and end sides of the device, and a drive pulley 7 provided on the other end side. The end portion 2b is connected to the wire 8 stretched between the pulleys 8.

Therefore, the rotation of the motor 6 is transmitted to the carrier 2 via the pulleys 7 and 8 and the wire 9, and the carrier 2 is moved left and right by the motor 6.

The platen 1O provided in the 17th row of the kites 4 and 5 feeds the recording paper 11 in the sub-scanning direction.
is rotated via the drive gear of the motor 15 and intermediate gears 13,14.

Next, we will explain the recording operation.The carriage 2 moves to the right in FIG. Based on the recording paper 11, recording is performed on the recording paper 11.The recording signal to 71" 1b is sent to the recording head F'l.
Static discharge of a and lb is sent to the recording head l" 1 b at timings that differ by one interval. The printing of the two colors may be performed alternately at intervals, or especially when one of the recordings is red. If the other side is black, draw an underline in red below the black letters.Also, in the wood example, the number of recorded hents is 2, so the number of recorded hents is set to 3 to 4. By doing so, color recording of other colors is also rotational.

When the print head 1a reaches the right end, the carriage 20's movement 'ii stops for one step, and then the platen roller 1o rotates due to the rotation of the motor 15, and the recording paper 11 moves by one line in the sub-scanning direction.

Turn the motor 6 in the opposite direction and carry it.

2 moves to the left, and notes 1a and 1b
records to the left end. Of course, now 1! Since the recording head lb precedes λ, the recording operation y l'' 1 a performs the recording operation at a timing that is a predetermined time later than that of the head 1b.

When the recording heads lb and 1a reach the left end, the carriage 2
The running of JxL&e is stopped, and the rotation of the motor 15 causes the recording paper 11 to move by one line in the sub-scanning direction. By repeating the above operations, a predetermined text or image is recorded on the front surface of the recording paper 11.

2 and 3 are perspective views showing the detailed structure of the head of the recording apparatus of the present invention.

In each figure, the reference numeral 16 indicates a plurality of tread discharges (
It is a liquid discharge member having a color of 16, a, and is made from nickel using an electroforming method or by etching glass.

A groove portion 16b is formed on the back surface of the wing member 16, and a liquid discharge port 16a and an IuA wall 1 are formed in the groove portion 16b.
6c is provided. The partition wall 16c is provided to prevent liquid from being ejected from other liquid ejection ports when liquid is ejected from a specific liquid ejection port 16a.
Since it surrounds the liquid ejection hole 16a, it becomes difficult for the ink ejection pressure inside the medium ejection hole 16a to escape to other places during the ejection operation, which has the effect of lengthening the ejection distance of the droplet.

A reference plate 17 is made of a glassy material that is much cheaper than silicon or siliconium, and a substrate 171- is provided with a plurality of electrical resistors 17a, a plurality of current-carrying electrodes 17b, and a liquid supply hole 17c. There is. When a predetermined current is passed through the electrode 17b, the resistor 17. a is something that emits L. The size of this resistor 17a is 501tm' x 50g
It is about m. - The substrate 17 described above is made of inexpensive ceramic Muramata, and has a glassy layer at least in the vicinity of where the resistance element is provided to provide an appropriate heat storage effect necessary for rapid rise in temperature. may also be used.

18), (Hold the board 17 several times with the board holding memberjlVj
18a, a liquid supply hole 18b, and a hole 18c. Also, numeral 19 has a flange 19a for storing a liquid bag.

The opening of the rice bran bag 19 has a width L, +, and a length M of L<
It has an M oval shape. In order to make the head width N as small as possible and increase the amount of liquid that can be accommodated in the holder 19, it is effective to make the opening part elliptical. In addition to the above-mentioned parts, the recording case 1 has a rear catch part 15. It has a plurality of coupling pins 1g and an advance storage section 1h. Moreover, the notch 11 provided at the lower end is made by breaking off the protruding piece 1j. The protruding pieces 1j are attached to the recording head outer body 1a, l.
There are four notches 1i provided at the lower end of b, and by cutting off the positions in the front cover 1'9 corresponding to the decoloring, cutouts 1i corresponding to the decoloring are made.

Next, based on FIG. 4, the state of the recording head assembly f, the recording heads la, lb, and the carriage 2 will be described in a few words, and the recording operation of the recording heads la, 1b. Fourth
This figure is a sectional view taken along the center direction of the recording head la in FIG.

The liquid discharge member 16 and the substrate 17 are bonded together with an adhesive. Furthermore, the substrate 17 and the holding member 18 are also bonded together with an adhesive.

flange provided on the holding member 18) "jRl 8 d
A groove 18e is provided on the outer periphery of the groove 18e.
The electrical equipment 19, which contains the liquid 20 through a layer inserted into the inside of the flange portion 19a of the electrical equipment 19, is coupled to the iso-holding member.

Above condition! In FIG. 2, the coupling pin 1g of the housing 1 passes through the coupling hole 18c of the holding member 18, and the coupling pin 1
When the holding member 18 (111j) and the W body 1 are connected by an automatic machine, the electrical component 19 is inserted into the groove 18e as described above. Since it is strongly connected to the holding member 18 at 1C, when the housing 1 is removed, the electrical equipment 19 can be assembled without fear of coming off from the holding member 18.

Next, the state in which the recording vanes l''la and lb are attached to the carriage 2 will be explained.

To note 5I, rear hook part 1 of do la, ], b
5, the hole 2c of the carrier 2, and the +iii force/pull 11 [the hook 1c and the hook 2a are connected respectively and the recording head l"l
a, 1b are fixed to the carrier 2.

Since the catch parts 10 and 15 are provided on the fF frame, the force when the recording bend 1 is fixed to the carrier 2 is applied to the housing 1, but the rigidity of the writing body 1 is high. - The substrate 17 having the resistive element 17a absorbs the force and is hardly affected by the distortion caused by the force. Therefore, the resistance element will not be destroyed even if the recording head is inserted into the carriage several times.

On the other hand, since the catch parts are provided in front and behind the recording heads, when the recording heads la and lb are installed side by side, it is possible to draw several recording bends on the carriage 2 in close proximity without creating a space between the adjacent recording heads. - When the recording heads are arranged side by side while electrically connected, it is possible to reduce the distance between the liquid ejection ports for recording and between the recording heads, and therefore the scanning stroke of the carriage 2 with respect to the recording paper 1 becomes smaller, allowing the recording apparatus to be made smaller. can be converted into

A protruding member 2d provided on the "-" surface of the carriage 2 engages with the cutout portions 1i of the recording heads la and lb, and a plurality of protrusions are also provided corresponding to the positions of several of the plurality of heads. For example, a head containing black liquid can only be placed in a certain position.

The liquid 20 in the veneer 19 flows through the static supply hole 18 of the holding member 18.
The liquid is discharged through the liquid supply hole 17c of the substrate 17 and supplied to the groove 16b of the member L6.

When putting the static body 20 into the Okibukuro 19, the liquid is put in by crushing the front cover 19, so the restoring force of the front cover 19 causes the liquid in the liquid discharge port 16a to have a force acting on the path to return to the front cover. Because of this, there are five sho changes in the atmosphere.

No liquid will leak from the liquid discharge +: + 16 a due to the vibration applied to the recording 71.La, lb.

Next, the recording operation will be explained.

4, the recording pulse current generated by the control section is sent from the electric current section 3a provided at the tip of the flexible cable 3 through the electrode 1.7b of the knob plate 17 to the resistor 17a. It will be done.

The resistor 17a to which the printing pulse was applied instantly
The liquid 20 of the resistor 17aJ- is instantaneously vaporized and bubbles are generated as heat is generated to about 0. Therefore, one oil body discharges 16
The liquid 2o in the space a is splashed out from the liquid discharge port 16a by the air bubbles and is applied to the recording paper 11, whereupon recording is performed. When the liquid is discharged from the liquid discharge unit 16a, the groove 16b becomes a negative pressure, so that the liquid 20 in the advance 19 flows into the groove 16. While the carriage 2 is moving, the recording operation is repeated to form characters and images on the surface of the recording paper 11.

Next, the liquid 20 will be explained. Since this liquid is usually called ink, it will be referred to as ink in the following description. The main ingredients of this ink are water, polyethylene glycol, diethylene glycol, and a dye agent, and the mixing ratio is 50% in Irr+N ratio and 50% in the other. I- When the water is 60% and the other 40% is used in the recipe, the viscosity of the ink is greatly reduced, which increases the forward movement of the ink inside the liquid ejection port, ensuring reliable ejection at the start of printing, and increasing the ejection frequency. enables high-speed printing.

However, if the tip of the liquid ejection port is left open to the atmosphere, moisture will be emitted from the tip of the liquid ejection over time, and the ratio of increase in ink viscosity in liquid ejection 1:1 will be higher for 60% water than for 50% water. is large.

Therefore, with ink containing 60% water, main ingredients other than water may settle and stick within one liquid ejector.

1 (Ink in 71 bodies ejected) If simultaneous adhesion of the two agents occurs, it will be impossible to recover even by other means. Conventionally, methods have been used such as sealing the oil body, humidifying the inside of the cap, and constantly performing dry ejection related to recording at regular intervals to refresh the ink in the oil body ejection port. In the uninvented recording apparatus, since the tip of the ejector 1-1 is widely open to the air, ink with a moisture content of 50% to 55% is used to avoid ink solids.

After the printing operation is completed and the next printing operation begins, the tip of the nozzle discharger 1-1 is exposed to the atmosphere, especially if it is opened to the atmosphere. At the time of 1 [jl, moisture from the tip of the liquid ejection port is rapidly released, and the viscosity of the ink near the ejection port increases, which may cause ink ejection failure when the next printing starts. 4
As a result of experiments, it has been found that in order to lower the viscosity of the ink which has become viscous, it is effective to rapidly heat the vicinity of the liquid discharge 11 to about 60°C to 80°C.

The curve marked A in Figure 5 is the temperature-viscosity characteristic of an ink consisting of 50% water, 47% dichelene glycol, and 3% dye, while the curve marked CB) indicates that most of the water in the ink has evaporated. This shows the temperature-viscosity characteristics of the ink in which the remaining water content is 10% of diethylene glycol.

The viscosity of the ink inside the static discharge port changes from the characteristic of (A) to (B) due to the evaporation of water from the tip of the liquid discharge port over time.
) changes in the direction of the characteristic.

From the characteristics of (A), the ink viscosity at 25°C is 7 cp
At 60°C, the viscosity is 3.8 cp, which is about 1/2 as small. Also, from the characteristics of (B), the ink viscosity at 25% is 64 cp, and at 60°C, it is 20 cp and 1
The viscosity has decreased to /3 or less. According to experiments, the viscosity of ink that can be ejected is approximately 20°C or less, so by heating the vicinity of liquid ejection 1 to 60'C to 80°C, ink ejection can be performed reliably even after a long period of time. is clear.

An example of a method for reducing the viscosity and eliminating non-discharge is to install two 'electrothermal transducers at a predetermined interval along the liquid flow path, as described in Japanese Patent Laid-Open No. 58-424613. During recording, a drive signal is sent to one electrothermal transducer having an energy level capable of forming flying droplets, and during recording standby, a driving signal is sent to the other electrothermal converter to form flying droplets. There is a method of reducing the viscosity of the liquid by increasing the drive signal with an energy level that is not obtainable. but,
If such a method is adopted, two electrothermal converters are required, which is complicated, and the control of the energy lever (fU) is difficult and impractical.

Since the recording end of the recording apparatus according to the present invention uses an electric resistor 17a as an ink output drive element, the resistor 17a is
By passing through the section 7a where no ink is ejected, the temperature of the ink liquid near the liquid ejection port can be increased without providing any special heating element.

Moreover, in the recording head of the recording apparatus of the present invention, the electric resistor 1
The distance between 7a and the front body discharge port 16a is as thin as about 100 pm, so the ink layer between them is thin and the heat is transferred to the ink quickly. Since the resistor 17a is provided in
Due to the heat generated by the resistor 17. In addition to the effect of the thinness of the ink layer, the rate at which the stomach of a itself heats up is fast, and the time it takes for the ink in the liquid ejection port to reach 60°C is as short as several m5ec, making it necessary to wait for the subsequent printing operation. It is desirable that the heating be short-term, since heating for several minutes will conversely evaporate the water in the ink and increase the viscosity of the ink.

In addition, since a liquid ejection port is provided at the bottom of the resistor 17a, most of the ink whose viscosity has been reduced due to the heat generated by the resistor 17a is likely to be ejected from the liquid ejection port, which will be carried out later. The printing discharge operation is performed reliably.

Next, the means for not performing discharge will be explained based on FIG. FIG. 6 (A), (B), and (C) show the resistor 17a.
The waveform shown by the two-dot chain line is for normal printing.

As one of the means for not performing the above-mentioned ejection, there is a method of increasing the voltage higher than the voltage applied in the case of normal printing, as shown in Fig. 6 (
In A), the voltage level a is set to b.

One of the similar methods is to shorten the pulse width than the pulse width applied during normal printing, as shown in Q'S 6 (Fig.
In B), the pulse width C is set to d.

As one of the similar means, there is a method of applying a combination of the means shown in (A) and (B).

Apply the above method to history1. Set the temperature of the ink to 1-y.
In order to shorten the time required to apply ti:
There is a method of increasing the repetition frequency by lowering If:, which corresponds to the waveform e in FIG. 6(C).

Note that the droplet ejection speed IW can be adjusted by changing the waveform of the drive pulse.
and JP-A-55-13 as a method of increasing the ejection frequency.
Although there is a method as described in Japanese Patent No. 2263, this method does not attempt to realize the ink non-discharge state m' like the present invention.

Control of such means is performed by a microprocessor, either singly or in combination. Since the microprocessor is used in all recording apparatuses, there is no need to provide a special one, and a simple modification of the software is sufficient, so the present invention requires almost no cost to use the above means.

The ink viscosity-lowering heating operation by the resistor 17a is performed immediately after the recording apparatus is turned on, immediately after the first printing command is received, and immediately after the recording signal does not come for a predetermined period of time (for example, 3 minutes) and then comes again. It will be done.

On the other hand, -j- 10-odd t immediately after heating to lower the viscosity of the ink.

The disadvantage of dot recording is that the ink has little moisture, so the diameter of the dots is small and the dots are not aligned with other dots. In order to eliminate this drawback, immediately after the forward rotation of the ink to lower its viscosity, idle ejection unrelated to recording may be performed for more than 10 times as described above, and then printing ejection may be performed. The dry discharge is 1/lO~l of the conventional dry discharge.
/+00, so the lil of wasted ink consumption is greatly D.

When the present invention is applied to a liquid jet recording device having the structure explained with reference to the above drawings, the greatest effect can be obtained. It also applies advantageously to liquid jet recording devices of the type described.

[Effects] As is clear from the explanation in J- below, according to the invention, the recording device is configured to be easily assembled, detached and replaced, and therefore it is possible to recover from non-discharge of droplets. To low-cost and highly reliable one liquid jet recording that does not require any mechanism and can record in multiple colors;
・You can get 1.

Essentials of the device)°? Figure 2 is an exploded perspective view of the recording bend, Figure 3 is a perspective view of liquid ejection. Figure 6 (A)-(C) shows the relationship.
It is a diagram explaining the "inevitable pulse control iJ[ that became 'l+-.

l...13 bodies 1a, lb...17 Ghent lc.
...Hatch portion 1d...Take L1f...Rear catch portion 1g...Connection pin lh...Front storage compartment 11...
ν) Missing 2; Hl j... Protrusion 2... Carriage 2
a...Funk part 10...Platen 11...Recording paper 16...Liquid discharge member 16a...1 part valley body discharge 1
-116b... Groove portion 16c... Partition wall 17... Substrate 17a... Electric resistor 18... Substrate holding member 19... Advance loan 20... Liquid patent applicant Canon Co., Ltd.! Agent Patent Attorney Kato 1:r

Claims (4)

[Claims] (1) A liquid ejecting member having a plurality of liquid ejection ports for ejecting oil droplets, a plurality of electrical resistors for ejecting ink, and a substrate integrated with the above-mentioned ejecting member; A liquid jet recording head F, which is patented as comprising a holding member defined therein, and an electrical component fixed to a side surface of the holding member opposite to the side surface on which the substrate is formed. (2) Allow liquid to pass through the holding member! 2. The liquid jet recording head according to claim 1, wherein the night body feeding hole is provided so as to pass through the front and back directions. (3) A patent characterized in that the holding member and the electrical equipment are configured to be integrally coupled by fitting a flange formed at the open end of the electrical equipment into a groove formed on the outer periphery of the holding member. A liquid jet recording bend according to claim 1 Jη. (4) #? 1 (recording bend for η body injection) according to claim 1, wherein the opening 11 of the double bag is formed in an elliptical shape.