JPH06238912A - Recording device - Google Patents

Abstract

PURPOSE:To absorb ink streamed from an ink discharge port and prevent a breakage of a device and a leak of the ink outside of the device, by providing an ink absorbing body absorbing the ink on the lower part of the ink discharge port. CONSTITUTION:An ink absorbing body 43 is fitted to the front part of a carriage 3 so that at the time of installation of a recording head 2, it is stuck to the front of the recording head 2 and positioned to the lower part of an ink discharge port 2a. In the case where ink is streamed through the ink discharge port, the ink is streamed to the lower part by running along the front of the recording head 2 and absorbed into the ink absorbing body 43. Thereby, it becomes possible to prevent leaked ink from being streamed to, for example, an electric part or a contact point, prevention of short-circuit or corrorsion becomes possible and ink flowing from the recording device can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus for recording by ejecting ink from a recording means onto a recording material.

[0002]

2. Description of the Related Art An ink jet system (ink jet recording device) is a device for recording by ejecting ink from a recording means (recording head) onto a recording material. Since it is a non-impact system, it produces less noise and more It has advantages such as easy recording of a color image using color inks.

However, as described above, the ink jet system is a system for recording by ejecting ink, and therefore, when ejecting ink from the ink ejection port, excess ink adheres to the vicinity of the ink ejection, or at high temperature for a long time. When the ink is stored, the viscosity of the ink may decrease and the temperature may expand, so that the ink may flow out from the ejection port, and the ink flowing out may damage the recording apparatus or leak the ink to the outside of the recording apparatus.

Particularly, in the recording apparatus of the present invention, since the recording head is a disposable type (disposable), since it has a contact portion for electrically connecting the recording head and the recording apparatus, the ink flowing out from the ink ejection port is If it flows into the contact portion, it may cause poor continuity of the contact portion or corrosion of the contact.

[0005]

SUMMARY OF THE INVENTION The present invention prevents the ink from damaging the device or leaking out of the device even when the ink flows out from the above-mentioned ink discharge port, and the ink is applied to the contact portion. To prevent poor conduction or corrosion of the contact portion.

[0006]

According to the present invention, an ink absorber for absorbing ink is provided below an ink ejection port, and the ink absorber absorbs ink flowing out from the ink ejection port. It is intended to prevent damage or leakage of ink to the outside of the apparatus.

Further, by providing the ink absorber below the ink ejection port and above the contact portion for electrically connecting the recording head and the recording apparatus, it is possible to prevent the contact portion from being wet with ink. You can

[0008]

EXAMPLES First, before describing specific examples of the present invention (providing an ink absorber), the configuration and operation of the main part of the ink jet recording apparatus of the present invention will be described in advance. 1 is a plan view of the recording apparatus, FIG. 2 is a right side view, and FIG. 3 is a left side view.

1, 2 and 3, reference numeral 1 indicates a base frame forming the main body of the apparatus.
On the other hand, a carriage 3 having a recording head 2 constituting a recording means is attached so as to be movable in the directions of arrows P and Q in FIG. The recording head 2 in the present embodiment uses an inkjet recording method in which energy is applied according to a recording signal to eject ink from the ejection port of the inkjet recording device. Among them, the recording head 2 is used for ejecting ink. A means (for example, an electrothermal converter or a laser beam) for generating heat energy is provided as the energy to generate the ink, and this heat energy causes a change in the state of the ink. This is because according to this method, high density recording and high definition recording can be achieved.

Reference numeral 4 is a hole 3a provided in the carriage 3.
The set lever 4 is rotatably attached to the recording head 2. The set lever 4 is a flexible cable 6 for connecting to the recording head 2 and a drive circuit board (not shown).
It is a member for pressing and fixing to.

The carriage 3 is a base frame 1
1 is supported by two sliding shafts 5a and 5b fixed to FIG.
It is configured to be slidable in the directions of arrows P and Q. Further, in this carriage 3, a single groove portion 13b formed on a screw 13 which is a rotating body described later (see FIG. 6).
1. A protruding pin 22 for entering and converting the rotational movement of the screw 13 into a linear movement in the directions of arrows P and Q in FIG.
(See FIG. 2) is fixed.

Reference numeral 7 denotes a platen, and the platen 7 also has a function as a guide of a recording sheet which is a recording medium. A feed roller 8 for feeding the recording sheet is rotatably supported by the base frame 1 and the right side plate 10, and a gear portion 8a is formed at a predetermined position. A rubber ring 9 is attached to the center of the feed roller 8a, and the pinch roller 2 is provided below each rubber ring 9.
3 are provided so as to face each other and have a spring property (not shown)
Thereby applying pressure to the rubber ring 9 via the pinch roller 23. The recording sheet is inserted between the rubber ring 9 and the pinch roller 23, and is conveyed according to the rotation amount of the feed roller 8.

FIG. 2 shows the right side surface from which the above-mentioned right side plate 10 is removed. In FIG. 2, reference numeral 11 denotes a main gear that is a first rotating member, the main gear 11 is fixed to a shaft 12, and the shaft 12 is rotatably supported by the base frame 1. Reference numeral 14 denotes a reversing gear that is a second rotating member, and the reversing gear 14 is rotatably supported by a shaft protruding from the base frame 1. Reference numeral 13 indicates a screw, and a right end portion of the screw 13 is integrally formed with a gear portion 13a which is a third rotating member.

The reversing gear 14 and the screw gear 13a are always in mesh with each other, but the main gear 11 and the reversing gear 14 are in mesh with each other.
Alternatively, the screw gear 13a is configured to intermittently transmit power by a mechanism described later.

FIG. 4 shows a side surface except the left side plate 16 in FIG. 3, and 15 shows a DC motor as a drive source, and the worm gear 2 is provided on the motor shaft of the DC motor 15.
1 is press-fitted and fixed. In this worm gear 21,
A disk-shaped encoder slit 21a is integrally formed at the tip portion thereof, and is inserted into the concave groove of the ejection signal detector 19. Reference numeral 17 denotes a wheel gear, which is similarly fixed to the shaft 12 for fixing the main gear 11 and is always in mesh with the worm gear 21.

The ejection signal detector 19 is a transmissive photo detector and is provided on a PCB (printed circuit board) 18. At the same time, a recording start signal device 24 (transmissive photo detection) which will be described later is provided on the PCB 18. Vessel) is also provided. Reference numeral 20 denotes a rat cable connecting the PCB 18 and a drive circuit (not shown).

(Power Transmission System for Driving Carriage) Next, a power transmission system for reciprocally driving the carriage 3 will be described. FIG. 6 is a perspective view schematically showing a power transmission system relating to the reciprocating drive of the carriage, and the DC motor 15 always rotates in one direction when energized. As a result, the wheel gear 17 always rotates in the direction of the arrow J in FIG. 6 via the worm gear 21, and the main gear 11 also simultaneously rotates in the direction J via the shaft 12.
Rotate in the direction.

As described above, when the power of the main gear 11, which is constantly driven to rotate in the J direction, is directly transmitted from the main gear 11 to the screw gear 13a by the mechanism described later, the screw 13 moves in the direction of arrow K in FIG. Rotate to
At this time, the carriage 3 moves in the direction of arrow P.

On the other hand, when power is transmitted from the main gear 11 to the reversing gear 14, the reversing gear 14 and the screw gear 13a are always meshed with each other as described above, so that the reversing gear 14 is in the direction of arrow L in FIG. As a result, the screw 13 rotates in the direction of arrow M in FIG. 6, and the carriage 3 moves in the direction of arrow Q at this time.

Next, the shapes of the main gear 11, the reversing gear 14, and the screw gear 13a will be specifically described with reference to FIGS. 7 to 9. FIG. 7 is an explanatory view of the main gear 11. The gear 11 is divided into three facing portions, namely, a facing portion with the reversing gear 14, a facing portion with the screw gear 13a, and a facing portion with the feed roller gear 8a.

First, the portion facing the screw gear 13a is
The gear portion 31 and the cam portions 30 and 32 at both ends thereof are provided. The number of teeth of the gear portion 31 is set to 18 teeth in this embodiment, but this value is set to the reversing gear 14 and the screw gear 13.
It is determined by the number of teeth of a and how many times the screw 13 is driven to rotate.

Next, a portion facing the reversing gear 14 is similarly composed of a gear portion 34 and cam portions 33 and 35 at both ends thereof,
It is set to have the same shape as the facing portion of the screw gear 13a, and the difference is that the cams 33 and 35 are provided at each end, that is, the toothless portion of the reversing gear 14 to the screw gear 13a described later. (40 or 42 in FIG. 8 and FIG. 9). In addition,
The portion facing the feed roller gear 8a will be described later.

8 (A) and 8 (B) are explanatory views of the reversing gear 14, showing a full-circumferential tooth portion 38 having full-circular teeth and a toothed portion 39 having a partial tooth-missing portion (3 teeth) 40. Composed. As described above, the toothless portion 40 is formed by the cam portions 33 and 3 of the main gear 11.
It is located at a position facing No. 5. Further, the teeth of the full-circumferential tooth portion 38 and the toothed portion 39 are set so that the phase of the half tooth α portion is shifted in the rotational direction.

9A and 9B show the screw gear 13
It is explanatory drawing of a. Note that FIG. 9B shows A of FIG. 9A.
FIG. Like the reversing gear 14, it is composed of a toothed portion 41 having a partially toothless portion (three teeth) 42. The toothless portion 42 is formed by the cam portions 32, 3 of the main gear 11.
It is provided at a position facing 0.

Next, a specific operation will be described with reference to FIG. 10A to 10D are explanatory views limited to the movement of the reversing gear facing portion of the main gear 11 and the reversing gear 14 in order to facilitate understanding of the operation, and FIG. 10A is a cam of the main gear 11. The portion 35 shows a state in which it has entered the toothless portion 40 of the reversing gear 14. At this time, no rotational force is transmitted to the reversing gear 14, and even if the main gear 11 rotates in the direction of arrow J, the reversing gear 14 stops. is doing. Next is the main gear 1
When 1 further rotates in the direction of arrow J, the tooth portion 34a provided on the main gear 11 meshes with the tooth portion 14a of the reversing gear 14 as shown in FIG. 10B, and the reversing gear 14 moves in the direction of arrow L in the figure. It is driven to rotate.

In FIG. 10C, the reversing gear 14 is still driven to rotate in the direction of arrow L. Then, as described above, when the teeth of the main gear 11 are set so that the tooth portions 34b are meshed with each other, as shown in FIG. 1
The rotation of 4 is stopped and locked. The same operation is performed in the mutual transmission operation between the screw gear facing portion of the main gear 11 and the screw gear 13a.

Further, since the toothed portion 38 (see FIG. 8) of the reversing gear 14 and the screw gear 13a are always in mesh with each other, the reversing gear 14 and one rotation operation of the screw gear 13 are performed.
A is transmitted to a, and the screw 13 makes one rotation.

Here, the facing portion of the main gear 11 facing the reversing gear 14 and the facing portion of the screw gear 13a are set to be substantially 180 ° out of phase with each other as shown in FIG. Actually, for 180 °, FIG.
(The phase is further shifted by an angle θ between the position of the reversing gear 14 and the screw gear 13a to the center of the main gear 11 as shown in FIG. 10). In the state of FIG. The positional relationship between the screw gear 13a and the screw gear 13a is in the state of FIG.

However, in FIG. 6, (1) When the main gear 11 rotates 0 ° to 180 °, the reversing gear 14 makes one revolution in the direction of arrow L, and the reversing gear 14
The screw gear 13a makes one rotation in the direction of the arrow M via the. (2) When the main gear 11 rotates 180 ° to 360 °, the screw gear 13a makes one rotation in the direction of arrow K, and the reversing gear 14 moves through the screw gear 13a to the arrow N.
Make one full turn in the direction.

When the state is switched to (1) → (2) or (2) → (1), the cam portions 32 and 35 are accurately aligned with the toothless portions of the reversing gear 14 and the screw gear 13a. When inserted, the cam portions 30 and 33 enter the toothless portions to fix the gears.

(Recording Sheet Conveyance Transmission System) Next, the recording sheet conveyance transmission system will be described. In the recording sheet conveying operation, the tooth portions 36 and 37 formed integrally with the main gear 11 in FIG. 7 intermittently rotate the gear portion 8a of the feed roller 8 as the main gear 11 rotates. Done. The tooth portions 36 and 37 are out of phase with each other by 180 °, and are set by the screw 13 so that the carriage 3 is located in the vicinity of both sides and in a region that does not affect the recording operation of the recording head 3. ing.

Next, the recording operation in this embodiment will be described. FIG. 12 is a block diagram showing the configuration of the peripheral portion of the recording apparatus according to this embodiment. The CPU 50, the keyboard 51, the display unit 52, the power supply unit 53, the motor drive circuit 54, the recording head drive circuit 55, the recording It is constituted by the device 56. CPU 50 from the recording device 56
The signals to be inputted to the ejection position detection signal output from the ejection signal detector 19 and the recording start signal detector 2
There are two types of ejection start position detection signals output from No. 4.

When a voltage is applied to the DC motor 15 to start it, a discharge position detection signal is generated by the encoder slit disk 21a integrally formed with the worm gear 21. This signal is set to be generated in a one-to-one correspondence with each dot row in the dot matrix.

Next, the carriage 3 starts moving in the direction of arrow P from the right end position in FIG. 1, for example, by the mutual operation of the main gear 11, the reversing gear 14, and the screw gear 13a. Next, referring to FIG. 6, the encoder plate 25 fixed to the end of the screw 13 rotates as the screw 13 rotates, and the slits 25a, 25
b generates a recording start position signal.

The CPU 50 receives the ejection position start signal and, at the same time, selectively outputs a recording signal in synchronization with the ejection position detection signal, thereby performing recording in the direction of arrow P in FIG. When the recording in the P direction is completed, the CPU 50 counts the number of pulses of the ejection position detection signal and, after N pulses, turns off the energization of the motor 15. At this time, the recording sheet conveying operation has already been completed as described above, and the carriage 3 stops at the left end portion in FIG. The above timing chart is shown in FIG.

Next, when the motor 15 is started again, the screw 13 reversely rotates due to the above-described reversing mechanism of the screw 13, and the carriage 3 starts moving in the direction of arrow Q from the left end of FIG. A discharge position detection signal is also generated when the motor 15 is started. Further, the rotation of the encoder plate 25 again generates the ejection start position detection signal, and in synchronization with this, the CPU 50 selectively outputs the recording signal, thereby recording in the direction of arrow Q in FIG.

When the recording in the direction of the arrow Q is completed as described above, the CPU 50 counts the number of pulses of the ejection position detection signal and turns off the energization of the motor 15 after M pulses. At this time, as described above, the recording sheet conveying operation has also ended, and the carriage 3 stops at the right end portion in FIG. The above timing chart is shown in FIG.

Recording is performed on the recording sheet by repeating the above-described operation. Further, the CPU 50 needs to determine in advance whether the carriage 3 is located at the left end portion or the right end portion. As a method thereof, for example, when the system is powered on or a specific key (all clear key or the like) is used. ) Is pressed, the motor 15 is energized. Then, as shown in FIG. 13 or 14, the shape of the encoder plate 25 is set so that the ejection-related position detection signals generate different signals in the arrow P direction and the Q direction. If so, the CPU 50 determines that it is moving in the P direction, and if it is Y → X type, it is moving in the Q direction.

The difference between the encoder pulses X and Y is that
By counting the number of pulses of the ejection position detection signal during that time, it is possible to accurately determine even if the rotation speed of the motor 15 is different.

Further, the number of pulses from the end of recording in the P direction and the Q direction until the driving of the motor 15 is stopped is N and M, respectively, but these pulse numbers are basically set to the same value. However, a slight difference may be made due to a difference in load or the like.

Further, although the ink jet recording system is used as the recording means in the above-mentioned embodiment, the electrothermal converter is energized in response to a recording signal, and due to the growth of bubbles caused by heating beyond the film boiling by the electrothermal converter. More preferably, the ink is ejected from the ejection port to perform recording.

Regarding the typical constitution and principle thereof, for example, US Pat. Nos. 4,723,129 and 47407.
What is done using the basic principles disclosed in the '96 patent is preferred. This method can be applied to both the so-called on-demand type and continuous type, but in the case of the on-demand type in particular, it is arranged corresponding to the sheet or liquid path holding the liquid (ink). By applying at least one drive signal to the electrothermal converter, which corresponds to the recorded information and causes a rapid temperature rise exceeding nucleate boiling, thermal energy is generated in the electrothermal converter, and This is effective because film boiling is caused on the heat acting surface, and as a result, bubbles in the liquid can be formed in a one-to-one correspondence with the drive signal. Due to the growth and contraction of the bubbles, the liquid is ejected through the ejection openings to form at least one droplet. If this drive signal has a pulse shape,
Since bubble growth and shrinkage are immediately and appropriately performed, particularly excellent liquid ejection can be achieved, which is more preferable.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. If the conditions described in US Pat. No. 4,313,124 of the invention relating to the rate of temperature rise of the heat acting surface are adopted, more excellent recording can be performed.

As the constitution of the recording head, in addition to the combination constitution of the discharge port, the liquid passage, and the electrothermal converter (the linear liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned respective specifications. U.S. Pat. Nos. 4,558,333 and 4,445,960 which disclose a configuration in which a heat acting portion is arranged in a bending region.
The configuration using the specification No. 0 is also included in the present invention. Further, Japanese Patent Application Laid-Open No. 59-123670 discloses a structure in which a common slit is used as a discharge portion of a plurality of electrothermal converters, and an opening portion for absorbing a pressure wave of heat energy is discharged. The effect of the present invention is effective even if the configuration based on Japanese Patent Laid-Open No. 59-138461 is disclosed, which discloses the configuration corresponding to the above. That is, according to the present invention, recording can be surely and efficiently performed regardless of the form of the recording head.

In addition, even in the case of the serial type described above, it is possible to electrically connect to the apparatus main body and supply ink from the apparatus main body by mounting the recording head fixed to the carriage or the carriage. A replaceable chip type recording head or a cartridge type recording head in which an ink tank is integrally provided in the recording head itself may be used.

Further, it is preferable to add recovery means for the recording head, preliminary auxiliary means, etc., which are provided as a constitution of the recording apparatus of the present invention, because the effects of the present invention can be further stabilized. Specific examples thereof include capping means for the recording head, cleaning means, pressurizing or sucking means, electrothermal conversion type or other heating element or a preheating means by a combination thereof,
It is also effective to perform stable recording by performing a preliminary ejection mode in which ejection is performed separately from recording.

Regarding the type and number of recording heads mounted on the carriage, for example, only one is provided corresponding to a single color ink, or a plurality of inks having different recording colors and densities are supported. And a plurality of them may be provided. That is, for example, the recording mode of the recording apparatus is not limited to a recording mode of only the mainstream color such as black, but may be a combination of a plurality of recording heads integrally formed, but a mixed color of different colors or a mixed color It is also applicable to a device with at least one of the full colors according to

In addition, although the ink is described as a liquid in the above-mentioned embodiments, it is an ink which solidifies at room temperature or lower and softens or liquefies at room temperature, or an ink jet recording broom. In general, the temperature of the ink itself is adjusted within the range of 30 ° C. or higher and 70 ° C. or lower to control the temperature of the ink so that the viscosity of the ink is within the stable ejection range. Anything is good. In addition, it is possible to prevent the temperature rise due to thermal energy from being positively used as the energy for changing the state of the ink from the solid state to the liquid state, or to use ink that solidifies when left standing for the purpose of preventing ink evaporation. However, in any case, when heat ink is liquefied by applying heat energy according to the recording signal and liquid ink is ejected, or when the ink reaches the recording sheet, it begins to solidify. It is also applicable when using an ink that has the property of being liquefied for the first time by energy.

The ink in such a case is disclosed in JP-A-54-54.
As described in JP-A-56847 or JP-A-60-71260, a mode in which the electrothermal converter is opposed to a liquid sheet or a solid material held in a recess or through hole of a porous sheet. Also good. The most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

Further, as the form of the above-mentioned ink jet recording device, in addition to a form used as an image output terminal of an information processing device such as a computer, a form of a copying device combined with a reader or the like, and a form of a facsimile device having a transmission / reception function. It may be something to take.

(Embodiment 1) In the recording apparatus of the present invention, when the recording head 2 is installed, the ink absorber 43 comes into close contact with the front surface of the recording head 2 and is positioned below the ink ejection port 2a. Is attached to the front part of the vehicle (see FIGS. 1 and 2). Therefore, when the ink flows out from the ink ejection port, the ink flows downward along the front surface of the recording head 2 and is absorbed by the ink absorber 43.

As a result, it is possible to prevent the leaked ink from flowing to, for example, an electric component or a contact of the recording apparatus, that is, it is possible to prevent a short circuit or corrosion, and the ink is recorded. It can also be prevented from flowing out of the device. The ink absorber 43
The same effect can be obtained by directly attaching to the recording head 2 by adhesion or the like.

Further, in the recording apparatus of the present invention, it is preferable that the recording head is a disposable type,
In this case, the recording head and the recording apparatus have a connecting portion (contact portion) 6a (see FIG. 2) for electrically connecting them,
By providing the ink absorber 43 above the connection portion 6a, it is possible to prevent the connection portion 6a from being poorly conductive or corroded by the ink that has run down.

(Second Embodiment) FIGS. 15 and 16 show a second embodiment of the present invention. In the first embodiment described above, the ink absorber 43 is attached to the carriage 3 and brought into close contact with the recording head 2 so as to absorb the ink flowing out from the ink ejection port 2a. Four
3 and the size of the ink absorber 43 cannot be increased in space, as shown in FIGS. 15 and 16, in the second embodiment, the auxiliary ink absorber 44 is used as the recording device. The ink absorber 43 is installed at a position facing the ink absorber 43. By doing so, the ink absorber 43, which is in close contact with the carriage 2 and the recording head 2, comes into elastic contact with the auxiliary ink absorber 44 at a predetermined position.

As a result, the ink absorbed by the ink absorber 43 comes into contact with the auxiliary ink absorber at a predetermined position by the movement of the carriage 2 and the recording head 3,
Since the ink is partially absorbed by the auxiliary ink absorber, the ink absorption capacity is increased by the amount of the auxiliary ink absorber.

[0056]

As described above, by disposing the ink absorber below the ink ejection port, the ink flowing down from the ink ejection port is absorbed by the ink absorber, thereby damaging the recording apparatus. In addition, it is possible to prevent ink from leaking out of the device, and it is possible to improve the reliability of the recording apparatus.

Further, in the recording apparatus of the present invention, it is preferable that the recording head is a disposable type, and in this case, the joint portion can be protected from the ink by installing the ink absorber above the connection portion. It will be possible.

Further, by further providing an auxiliary ink absorber which is in contact with the ink absorber, the amount of ink absorbed can be increased.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a right side view of the first embodiment of the present invention.

FIG. 3 is a left side view of the first embodiment of the present invention.

FIG. 4 is a left side view of the first embodiment of the present invention.

FIG. 5 is a front view of the first embodiment of the present invention.

FIG. 6 is an explanatory diagram of a carriage drive system.

FIG. 7 is a detailed view of a main gear.

FIG. 8 is a detailed view of a reversing gear.

FIG. 9 is a detailed view of a screw.

FIG. 10 (A to D) is an explanatory diagram of disengagement.

FIG. 11 is an explanatory diagram of disengagement.

FIG. 12 is a block diagram.

FIG. 13 is a timing chart.

FIG. 14 is a timing chart.

FIG. 15 is a plan view of the second embodiment of the present invention.

FIG. 16 is a right side view of the second embodiment of the present invention.

[Explanation of symbols]

 1 Base Frame 2 Recording Head 3 Carriage 11 Main Gear 13 Screw 14 Reversing Gear 43 Ink Absorber 44 Auxiliary Ink Absorber

Claims (4)

[Claims] 1. An inkjet recording apparatus for recording by moving a recording head in parallel with a recording sheet, wherein an ink absorbing member for absorbing ink is provided below an ink ejection port of the recording head. 2. The ink jet recording apparatus according to claim 1, wherein an ink absorber that absorbs ink is provided above a connecting portion for electrically connecting the recording head and the recording apparatus. Inkjet recording device. 3. The ink jet recording apparatus according to claim 1, further comprising an auxiliary ink absorber arranged so as to come into contact with the ink absorber at a predetermined position when the ink absorber moves. Characteristic inkjet recording device. 4. The inkjet recording apparatus according to claim 1, wherein the recording head is a disposable type.