JPH08300737A - Line recording device - Google Patents

Abstract

PURPOSE: To provide a line recording device wherein the number of switching elements of a head drive means is small and a maximum value of consuming current is restrained. CONSTITUTION: This line ink jet recording device has a plurality of ink jet head units 2, 3, 4, and 5. The ink jet head units 2, 3, 4, and 5 are arranged such that a distance L' between adjacent ink jet head units in the conveying direction of a recording paper 6 does not become an integral multiple of a record dot pitch in the conveying direction of the recording paper 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line-type recording apparatus having a plurality of line-type recording heads in which a plurality of recording means are linearly arranged in a direction perpendicular to a conveying direction of a recording material. is there.

[0002]

2. Description of the Related Art Conventionally, a recording device such as a printer, a copying machine or a facsimile connected to a computer or a word processor forms an image on a recording material such as paper or a plastic thin plate based on image information. It is configured to go.

The recording apparatus can be classified into an ink jet type, a wire dot type, a thermal type and the like according to the recording method. In either method, a recording material such as ink is attached to a recording material such as paper or a plastic thin plate to form an image.

In the case of the wire dot type, a wire is projected by an electromagnetic force or the like, a ribbon impregnated with ink is hit against a recording material, and the ink is transferred to the recording material to form an image. In the case of the ink jet type, film boiling is formed by the heat energy applied by the electrothermal energy converter, and the pressure change caused by the generation and contraction of bubbles due to the film boiling is utilized to make a recording means (inkjet head). A device configured to eject ink to a recording material to perform recording, or an ink ejecting unit that ejects ink to the recording material by changing the volume of an ink chamber by an electromechanical transducer such as a piezo element. Generally, an image is formed by using.

In the recording apparatus, the recording means is mounted on a carriage and recording is performed while the recording means reciprocates on the front surface of the recording material, and a recording material is conveyed in the conveying direction (main scanning direction). In addition, a large number of recording means are arranged linearly in a vertical direction (sub-scanning direction) and can be classified into a line type in which a recording material is conveyed and recording is performed with the recording means fixed. The line-type recording apparatus has a merit that recording can be performed at a very high speed because recording means corresponding to a recordable range in the sub-scanning direction is arranged and a large range can be recorded at the same time. There is.

Conventionally, a line printer or the like, which is a kind of line type recording apparatus, has been used for output of a large industrial computer or the like. However, in recent years, color recording has been strongly demanded for printers and the like used for output of OA (office automation) equipment and the like. It is very difficult to perform color recording at high speed with a serial type recording apparatus. In order to perform color recording at high speed, a color line type recording apparatus that performs recording using a plurality of line type recording heads is suitable, and there is a strong demand from the market.

A conventional line type color ink jet recording apparatus will be described with reference to FIGS. In this example, the resolution is 300 × 300 DPI (Dot Per Inc.
Each numerical value is set for the line type color ink jet recording apparatus which is h) and has a recordable range in the sub-scanning direction of 8 inches.

FIG. 7A is an external perspective view of a general line type ink jet head unit, and FIG. 7B is a view of arrow A in FIG. 7A. In the inkjet head unit of FIG. 7, an ink tank that stores ink and an inkjet head that discharges ink are integrally formed. As shown in FIG. 7B, 2400 ejection ports 1 for ejecting ink are linearly arranged at a pitch of 1/300 inch over 8 inches corresponding to the recordable range.

FIG. 8 is a structural view showing a conventional line type color ink jet recording apparatus. As shown in FIG. 8, a yellow inkjet head unit 2 that ejects yellow ink, a magenta inkjet head unit 3 that ejects magenta ink, a cyan inkjet head unit 4 that ejects cyan ink, and a black ink are used. A black inkjet head unit 5 for discharging is provided. The distance L in the main scanning direction between the inkjet head units 2 to 5 is 4/300 inch, which is an integral multiple of the dot pitch (1/300 inch) of 300 DPI. The recording paper 6 is transported in the transport direction indicated by the arrow B by the paper transport rollers 7 and 8.

FIG. 9 is a block diagram of a conventional line type color ink jet recording apparatus. 9, the same parts as those in FIG. 8 are designated by the same reference numerals.

In FIG. 9, the computer 101 is
Image information or character information to be recorded is output to a color inkjet recording device. The central control means 102 processes input information and controls the entire apparatus. Storage means 103
Stores a program for information processing performed by the central control unit 102 and control of the apparatus, and provides the program to the central control unit 102. The sensor 104 detects the state of the color inkjet recording device, such as the presence or absence of paper, and provides the information to the central control unit 102.

The actuator driving means 105 drives an actuator 106 such as a sheet conveying motor according to an instruction from the central control means 102. Yellow head drive means 107, magenta head drive means 108, cyan head drive means 109 and black head drive means 110.
Drives the yellow inkjet head unit 2, the magenta inkjet head unit 3, the cyan inkjet head unit 4, and the black inkjet head unit 5, respectively.

As described above, since one ink jet head unit is provided with 2400 ejection ports, each head drive means needs to drive 2400 ink ejection means. Therefore, the head drive means 1
Each of 07 to 110 has 2400 switching elements built therein. The power supply unit 111 rectifies a general household AC power supply, and central control means 102, actuator driving means 105 and head driving means 107.
~ 110 to power.

FIG. 10 is a diagram showing the operation of a conventional line type color ink jet recording apparatus. Next, the operation of the conventional line type color ink jet recording apparatus will be described with reference to FIG. Note that the recording paper 6 is 1 /
A grid is attached at a pitch of 300 inches. 10, the same parts as those in FIG. 8 are designated by the same reference numerals.

At the time of recording, the ink jet head of the line type ink jet head unit is driven in accordance with the image signal and ink is ejected from the ejection port to form an image.

First, the yellow ink droplet 9 is ejected from the yellow ink jet head unit 2 (step S21), and the yellow ink droplet 9 adheres to the point a of the recording paper 6 (step S22). When the recording paper 6 is conveyed by 1/300 inch, the yellow inkjet head unit 2 performs the second ejection (step S23).

When a series of these operations are repeated, the recording at the point a, which is performed by the yellow ejection, is located on the front surface of the magenta ink jet head unit 3. In this embodiment, since the pitch between the heads is 4/300 inches, the recording paper 6 is in a state of being conveyed by 4/300 inches. At this point, the yellow inkjet head unit 2 and the magenta inkjet head unit 3 simultaneously eject the yellow ink droplet 9 and the magenta ink droplet 10, respectively (step S2).
4), magenta recording is performed at point a, and at the same time yellow recording is performed at point b (step S25).

When recording is further continued, point a is located in front of the cyan ink jet head unit 4, and the yellow ink jet head unit 2, the magenta ink jet head unit 3, and the cyan ink jet head unit 4 are simultaneously ejected with yellow ink drops. 9, the magenta ink droplet 10 and the cyan ink droplet 11 are ejected (step S26).

After that, point a is located in front of the black ink jet head unit 5 (step S).
27). At this time, the point b to be recorded next is located on the front surface of the cyan inkjet head unit 4, the point c to be recorded next is located on the front surface of the magenta inkjet head unit 3, and the yellow inkjet head unit The d point to be recorded next is located on the front surface of 2. Therefore, the four inkjet head units 2,
3 and 4 simultaneously eject a yellow ink drop 9, a magenta ink drop 10, a cyan ink drop 11 and a black ink drop 12 (step S28), recording black at point a, recording cyan at point b, and recording c at point b. The recording of magenta and the recording of yellow at point d are performed simultaneously (step S29).

FIG. 11 is a diagram showing ejection timing pulses of four ink jet head units of a conventional line type color ink jet recording apparatus. As shown in FIG. 11, the four ejection timing pulses are generated at exactly the same cycle and at the same timing.

FIG. 12 is a diagram showing an output current waveform from a power supply unit of a conventional line type color ink jet recording apparatus. As shown in FIG. 12, the output current waveform from the power supply unit shows a large peak in synchronization with the ejection cycle of the inkjet head unit.

FIG. 13 is a circuit diagram of a head driving means of a conventional line type color ink jet recording apparatus.

The yellow ink jet head unit 2 has 2400 yellow ink ejecting means Y0001.
~ Y2400, the magenta ink jet head unit 3 includes 2400 magenta ink ejecting means M.
0001 to M2400, the cyan inkjet head unit 4 includes 2400 cyan ink ejecting means C0001 to C2400, and the black inkjet head unit 5 includes 2400 black ink ejecting means B0001 to B2400.

The yellow head driving means 107, the magenta head driving means 108, the cyan head driving means 109 and the black head driving means 110 are each 240
Built-in 0 sets of switching elements. Therefore, a total of 9600 sets of switching elements are provided.

[0025]

As described above, in the conventional line type color ink jet recording apparatus, 2
A total of 9600 switching elements of 400 sets × 4 are required. Therefore, the head driving means becomes very expensive, which causes the cost of the entire recording apparatus to increase.

Further, as many as 9,600 ink ejecting means are driven at the same time, so a large amount of electric power is instantaneously required. Therefore, a large-capacity power supply unit is required, which further increases the price of the entire recording apparatus.

An object of the present invention is to provide a line type ink jet recording apparatus in which the number of switching elements of the head driving means is small and the maximum value of current consumption is suppressed.

[0028]

A line type recording apparatus according to a first aspect of the present invention is a line type recording apparatus having a plurality of line type recording heads, in which a distance between adjacent line type recording heads in a recording material conveying direction. Is a plurality of line-type recording heads arranged so as not to become an integral multiple of the recording dot pitch in the recording material conveyance direction.

A line type recording apparatus according to a second aspect of the present invention is the same as the line type recording apparatus according to the first aspect of the present invention, in which all the distances between a plurality of line type recording heads are the same.

A line type recording apparatus according to a third aspect of the present invention is a line type recording apparatus having a plurality of line type recording heads, in which K1 and M1 are integers, H1 is an integer of 1 or more and less than M1, and P is a recording target. When the recording dot pitch in the material conveying direction is used, the distance L1 in the recording material conveying direction between the adjacent line type recording heads is calculated by L1 = (K1 + H1 / M1) × P (1) Equation (1) It is set to a value that can be written.

A line type recording apparatus according to a fourth aspect of the present invention is a line type recording apparatus having a plurality of line type recording heads, in which K2 and M2 are integers and P is a recording dot pitch in the recording material conveying direction. The distance L2 between the adjacent line type recording heads in the recording material conveyance direction is set to a value derived from L2 = (K2 + 1 / M2) × P (2) equation (2).

A line type recording apparatus according to a fifth aspect of the present invention is a line type recording apparatus having a plurality of line type recording heads, in which K3 and M3 are integers and P is a recording dot pitch in the recording material conveyance direction. , L3 = (K3-1 / M3) × P (3) The distance L3 in the recording material conveyance direction between adjacent line type recording heads is set to a value derived from the equation (3). .

A line-type recording apparatus according to a sixth aspect of the present invention is a line-type recording apparatus having a plurality of line-type recording heads, where K4 is an integer, N1 is the number of line-type recording heads, and P is the recording material conveyance. When the recording dot pitch in the direction is set, the distance L4 in the recording material conveyance direction between adjacent line-type recording heads is L4 = (K4 + 1 / N1) × P (4) A value derived from equation (4) Is set to.

A line-type recording apparatus according to a seventh aspect of the invention is a line-type recording apparatus having a plurality of line-type recording heads, where K5 is an integer, N2 is the number of line-type recording heads, and P is the recording material conveyance. When the recording dot pitch in the direction is set, the distance L5 between the adjacent line-type recording heads in the recording material conveyance direction is derived from L5 = (K5-1 / N2) × P (5) Formula (5) It is set to a value that can be written.

The line type ink jet recording apparatus according to the eighth invention is a first invention, a second invention, a third invention, a fourth invention, a fifth invention, a sixth invention or a seventh invention. The line type recording apparatus according to the present invention has the configuration.

A line type ink jet recording apparatus according to a ninth aspect of the present invention is a line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, and the distance between adjacent ejection port groups is A plurality of ejection port groups are arranged so as not to be an integral multiple of the recording dot pitch in the recording material conveyance direction.

A line type ink jet recording apparatus according to a tenth aspect of the present invention is a line type ink jet recording apparatus having a plurality of ejection port groups which are divided in the recording material conveying direction, in which all distances between adjacent ejection port groups are set. They are the same.

The line type ink jet recording apparatus according to the eleventh aspect of the invention is a line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, wherein K6 and M4 are integers and H2 is 1. M4
When P is a recording dot pitch in the recording material conveyance direction, the distance L6 in the recording material conveyance direction between adjacent ejection port groups is L6 = (K6 + H2 / M4) × P ( 6) It is set to a value derived from the equation (6).

The line type ink jet recording apparatus according to the twelfth aspect of the invention is a line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, wherein K7 and M5 are integers and P is an object. When the recording dot pitch in the recording material conveyance direction is set, the distance L7 in the recording material conveyance direction between the adjacent ejection port groups is calculated by L7 = (K7 + 1 / M5) × P (7) Equation (7) It is set to a value that can be written.

A line type ink jet recording apparatus according to a thirteenth aspect of the present invention is a line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, where K8 and M6 are integers and P is an object. When the recording dot pitch in the recording material conveyance direction is set, the distance L8 in the recording material conveyance direction between adjacent ejection port groups is L8 = (K8-1 / M6) × P (8) Formula (8) It is set to a value that is more guided.

A line type ink jet recording apparatus according to a fourteenth aspect of the present invention is a line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveyance direction, wherein K9 is an integer and N3 is an ejection port group. The number of P
Is the recording dot pitch in the recording material conveyance direction, the distance L9 in the recording material conveyance direction between adjacent ejection port groups is L9 = (K9 + 1 / N3) × P (9) Equation (9) It is set to a value that is more guided.

A line type ink jet recording apparatus according to a fifteenth aspect of the present invention is a line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, where K10 is an integer and N4 is an ejection port group. And the number of
When P is the recording dot pitch in the recording material conveyance direction,
The distance L10 in the recording material conveyance direction between adjacent ejection port groups is set to a value derived from L10 = (K10-1 / N4) × P (10) equation (10).

[0043]

In the line type recording apparatus according to the first to fifteenth aspects, the distance between the adjacent line type recording heads in the recording material conveying direction or the distance between the adjacent ejection port groups in the recording material conveying direction is Since it is set so as not to be an integral multiple of the recording dot pitch in the recording material conveyance direction, the ink ejecting means of the plurality of recording heads or the plurality of ejection port groups are driven at different timings. Therefore, it is possible to share a drive device for the ink ejection means of a plurality of recording heads or a plurality of ejection port groups. Therefore, the price of the head drive means can be reduced.

Further, by dispersing the ejection timing in a plurality of recording heads or a plurality of ejection port groups,
Maximum power consumption can be reduced. Therefore, the power supply unit can be downsized.

[0045]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A line type color ink jet recording apparatus according to an embodiment of the present invention will be described below with reference to FIGS. Also in this embodiment, similarly to the conventional example,
Numerical values are set for a line type color inkjet recording apparatus having a resolution of 300 DPI × 300 DPI and a recordable range of 8 inches.

FIG. 1 is a structural diagram showing a line type color ink jet recording apparatus in one embodiment of the present invention. 1, the same parts as those in FIG. 8 are designated by the same reference numerals.

As shown in FIG. 1, a yellow ink jet head unit 2 for ejecting yellow ink, a magenta ink jet head unit 3 for ejecting magenta ink, a cyan ink jet head unit 4 for ejecting cyan ink, and a black ink jet head unit 4. Black ink jet head unit 5 that ejects the above ink
Is provided. The recording paper 6 is transported in the transport direction indicated by the arrow B by the paper transport rollers 7 and 8. Here, the inkjet head units 2, 3, 4, and 5 are
This is the same as the inkjet head unit shown in FIG. 7.

The distance L'in the main scanning direction of the ink jet head units 2 to 5 is determined by the above equations (1), (2),
Distances L respectively derived from (3), (4) and (5)
It is set to any one of 1, L2, L3, L4 and L5.

Here, the distance L4 derived from the equation (4)
Shall be used. L4 = (K4 + 1 / N1) × P (4) L4 is a distance between adjacent line type recording heads (line type inkjet head units), K4 is an integer, and N1 is a line type recording head (line). Type inkjet head unit), and P is a recording dot pitch in the recording material conveyance direction. K4 = 4, N1 = 4, P =
When it is determined to be 1/300 and these values are substituted into the above equation (4), L ′ = L4 = (4 + 1/4) × 1/300 = 4.25 / 300 inches.

As described above, in this embodiment, the distance L'in the main scanning direction between the ink jet head units 2 to 5 is set to 4.
Set to 25/300 inches.

FIG. 2 is a block diagram of a line type color ink jet recording apparatus in one embodiment of the present invention. 2, the same parts as those in FIG. 1 are designated by the same reference numerals.
Further, in FIG. 2, the same parts as those in FIG.
The description is omitted.

The line type color ink jet recording apparatus of FIG. 2 is different from the line type color ink jet recording apparatus of FIG. 9 in that a yellow head driving means 107, a magenta head driving means 108, a cyan head driving means 109 and a black head driving means 110. Instead of the first head driving means 112 and the second head driving means 113
Is provided, and the power supply unit 114 is provided instead of the power supply unit 111.

The first head driving means 112 and the second head driving means 113 drive the line type ink jet head unit. The first head driving means 112 has 240
Zero switching elements are built in. The second head driving means 113 has four large capacity switching elements built therein. The power supply unit 114 rectifies a common household AC power supply and serves as a DC power supply for the central control means 1.
02, the actuator driving means 105, the first head driving means 112 and the second head driving means 113 are supplied with electric power.

FIG. 3 is a diagram showing the operation of the line type color ink jet recording apparatus in one embodiment of the present invention.
Next, the operation of the line type color ink jet recording apparatus in this embodiment will be described with reference to FIG. Also in this embodiment, as in the conventional example, the recording paper 6 is provided with a grid at a 1/300 inch pitch for convenience. 3, the same parts as those in FIG. 1 are designated by the same reference numerals.

At the time of recording, the ink jet head of the line type ink jet head unit is driven according to the drive signal to eject the ink from the ejection port to form an image.

First, the yellow ink droplet 9 is ejected from the yellow ink jet head unit 2 (step S1), and the yellow ink droplet 9 adheres to point a of the recording paper 6 (step S2). When the recording paper 6 is conveyed by 1/300 inch, the yellow inkjet head unit 2 performs the second ejection (step S3).

When a series of these operations are repeated, the recording of the point a, which is performed by the ejection of the yellow ink jet head unit 2, is located near the magenta ink jet head unit 3 (step S4). In the present embodiment, the pitch between the heads is 4.25 / 300 inches. Therefore, in order to record at point a with the magenta inkjet head unit 3, it is necessary to convey the recording paper 6 by 0.25 / 300 inches. There is.

When the 0.25 / 300 inch recording paper 6 is conveyed, point a is located in front of the magenta ink jet head unit 3 (step S5). The magenta inkjet head unit 3 has a magenta ink droplet 10
Is ejected (step S6), the magenta ink droplet 10 adheres to point a of the recording paper 6 (step S7).

At this time, there is no point b of the recording sheet 6 to be recorded on the front surface of the yellow inkjet head unit 2, and the recording sheet 6 is conveyed by 0.75 / 300 inch, and the point b is the yellow inkjet head unit. Two
(Step S8). The yellow inkjet head unit 2 ejects a yellow ink droplet 9 (step S9), and performs recording at point b. The same operation is repeated to perform recording by the magenta inkjet head unit 3.

The point a will eventually be located near the black ink jet head unit 5 (step S10).
In order to record at point a with the black inkjet head unit 5, the recording paper 6 is further 0.25 / 300.
Need to transport inches.

When the 0.25 / 300 inch recording paper 6 is conveyed, point a is located in front of the black ink jet head unit 5 (step S11). Black ink jet head unit 5 has 1 black ink drop
2 is discharged (step S12), and recording is performed at point a.

Subsequently, the recording paper 6 is continuously changed to 0.25 / 30.
When it is conveyed by 0 inch, the point d at which yellow should be recorded is located in front of the yellow inkjet head unit 2, and the yellow inkjet head unit 2 ejects the yellow ink droplet 9 (step S13) and performs recording at point d. .

Further, when the recording paper 6 is conveyed by 0.25 / 300 inch, the point c where magenta should be recorded is located in front of the magenta ink jet head unit 3, and the magenta ink jet head unit 3 ejects the magenta ink droplet 10. Discharging (step S14), recording is performed at point c.

Furthermore, the recording paper 6 is changed to 0.25 / 30.
When it is conveyed by 0 inch, the point b at which cyan should be recorded is located in front of the cyan inkjet head unit 4, and the cyan inkjet head unit 4 ejects the cyan ink droplet 11 (step S15) and performs recording at point b. . Furthermore, when the recording paper 6 is conveyed by 0.25 / 300 inch, the black inkjet head unit 5 ejects the black ink droplet 12 (step S1).
6), record.

Hereinafter, steps S13 to S16
Recording can be sequentially performed on the recording paper 6 by continuously repeating the above operations.

FIG. 4 is a diagram showing ejection timing pulses of the ink jet head of the line type color ink jet recording apparatus in one embodiment of the present invention. As is clear from the above description of the operation and FIG. 4, the four ejection timing pulses are generated in different phases by ¼ cycle.

FIG. 5 is a diagram showing an output current waveform from the power supply unit of the line type color ink jet recording apparatus in one embodiment of the present invention. In the output current waveform of FIG. 5,
Many small peaks appear as compared with the output current waveform of FIG.

FIG. 6 is a circuit diagram of the head driving means of the line type color ink jet recording apparatus in one embodiment of the present invention.

The yellow ink jet head unit 2 has 2400 yellow ink ejecting means Y0001.
~ Y2400, the magenta ink jet head unit 3 includes 2400 magenta ink ejecting means M.
0001 to M2400, the cyan inkjet head unit 4 includes 2400 cyan ink ejecting means C0001 to C2400, and the black inkjet head unit 5 includes 2400 black ink ejecting means B0001 to B2400.

The first head driving means 112 has 2400
A set of switching elements is built in. Further, the second head drive means 113 has four built-in switching elements. Since the ejection timings of the four inkjet head units 2, 3, 4, 5 are different, the first head driving means 112 and the second head driving means 11
By combining No. 3, it is possible to drive four inkjet head units 2, 3, 4, 5 with fewer switching elements than in the conventional example.

In the case of a line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, the distance between adjacent ejection port groups is calculated by the above formula (6),
The distance is set to any one of the distances L6, L7, L8, L9, and L10 derived from (7), (8), (9), and (10), respectively.

[0072]

According to the first to fifteenth inventions, the ink ejecting means of the plurality of recording heads or the plurality of ejection port groups can be driven at different timings, so that the plurality of recording heads or the plurality of ejection ports can be driven. It is possible to share the drive device of the ink ejection means of the group, and it is possible to reduce the number of switching elements of the head drive means. Therefore, the head driving means becomes cheaper and the price of the entire recording apparatus is reduced.

Further, since the number of ink ejecting means driven at the same time is small, the maximum value of current consumption is suppressed. Therefore, the power supply unit is downsized, and the price of the entire recording apparatus is reduced.

[Brief description of drawings]

FIG. 1 is a structural diagram showing a line type color ink jet recording apparatus in an embodiment of the present invention.

FIG. 2 is a block diagram of a line-type color inkjet recording apparatus according to an embodiment of the present invention.

FIG. 3 is a diagram showing an operation of a line type color inkjet recording apparatus in one embodiment of the present invention.

FIG. 4 is a diagram showing ejection timing pulses of an inkjet head of a line-type color inkjet recording apparatus according to an embodiment of the present invention.

FIG. 5 is a diagram showing an output current waveform from the power supply unit of the line type color inkjet recording apparatus in the embodiment of the present invention.

FIG. 6 is a circuit diagram of a head driving unit of a line type color inkjet recording apparatus according to an embodiment of the present invention.

FIG. 7 is a structural diagram showing a general line type inkjet head unit.

FIG. 8 is a structural diagram showing a conventional line-type color inkjet recording device.

FIG. 9 is a block diagram of a conventional line-type color inkjet recording device.

FIG. 10 is a diagram showing an operation of a conventional line type color inkjet recording apparatus.

FIG. 11 is a diagram showing ejection timing pulses of four inkjet head units of a conventional line type color inkjet recording apparatus.

FIG. 12 is a diagram showing an output current waveform from a power supply unit of a conventional line type color inkjet recording apparatus.

FIG. 13 is a circuit diagram of a head driving means of a conventional line type color inkjet recording apparatus.

[Explanation of symbols]

 1 Ejection Port 2 Yellow Inkjet Head Unit 3 Magenta Inkjet Head Unit 4 Cyan Inkjet Head Unit 5 Black Inkjet Head Unit 6 Recording Paper 7 Paper Transport Roller 8 Paper Transport Roller 9 Yellow Ink Drop 10 Magenta Ink Drop 11 Cyan Ink Drop 12 Black Ink Drop 101 Computer 102 Central Control Means 103 Storage Means 104 Sensor 105 Actuator Drive Means 106 Actuator 112 First Head Drive Means 113 Second Head Drive Means 114 Power Supply Unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B41J 2/245 B41J 3/10 102A 19/18

Claims (15)

[Claims] 1. A line type recording apparatus having a plurality of line type recording heads, wherein a distance between adjacent line type recording heads in a recording material conveying direction is not an integral multiple of a recording dot pitch in the recording material conveying direction. A line-type recording apparatus, wherein the plurality of line-type recording heads are provided in the. 2. The line type recording apparatus according to claim 1, wherein the distances between the plurality of line type recording heads are all the same. 3. A line type recording apparatus having a plurality of line type recording heads, wherein K1 and M1 are integers, and H1.
Is an integer greater than or equal to 1 and less than M1, and P is a recording dot pitch in the recording material conveyance direction, the distance L1 in the recording material conveyance direction between adjacent line-type recording heads is L1 = (K1 + H1 / M1) × P ... (1) A line type recording apparatus characterized by being set to a value derived from the equation (1). 4. A line type recording apparatus having a plurality of line type recording heads, wherein when K2 and M2 are integers and P is a recording dot pitch in a recording material conveying direction, the distance between adjacent line type recording heads is increased. Distance L2 in the recording material conveyance direction
L2 = (K2 + 1 / M2) × P (2) is set to a value derived from the equation (2). 5. A line type recording apparatus having a plurality of line type recording heads, wherein when K3 and M3 are integers and P is a recording dot pitch in the recording material conveying direction, the distance between adjacent line type recording heads is increased. Distance L3 in the recording material conveyance direction
L3 = (K3-1 / M3) × P (3) A line type recording apparatus characterized by being set to a value derived from the equation (3). 6. A line-type recording apparatus having a plurality of line-type recording heads, where K4 is an integer, N1 is the number of line-type recording heads, and P is a recording dot pitch in the recording material conveyance direction. A line type characterized in that the distance L4 between the line type recording heads in the recording material conveying direction is set to a value derived from L4 = (K4 + 1 / N1) × P (4) formula (4). Recording device. 7. A line type recording apparatus having a plurality of line type recording heads, where K5 is an integer, N2 is the number of line type recording heads, and P is a recording dot pitch in the recording material conveying direction, It is characterized in that the distance L5 in the recording material conveying direction between the matching line type recording heads is set to a value derived from L5 = (K5-1 / N2) × P (5) equation (5). Line type recording device. 8. A structure in which the line type recording head of the line type recording apparatus according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6 or claim 7 is a line type inkjet head. Line type inkjet recording device. 9. In a line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveyance direction, a distance between adjacent ejection port groups is an integral multiple of a recording dot pitch in the recording material conveyance direction. A line-type ink jet recording apparatus, wherein the plurality of ejection port groups are arranged so as not to become the above. 10. A line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, wherein the distances between adjacent ejection port groups are all the same. The line-type inkjet recording device described. 11. A line type ink jet recording apparatus having a plurality of ejection port groups divided in a recording material conveying direction, wherein K6 and M4 are integers and H2 is 1 or more and M4.
When P is a recording dot pitch in the recording material conveyance direction, the distance L6 in the recording material conveyance direction between adjacent ejection port groups is L6 = (K6 + H2 / M4) × P ( 6) A line-type ink jet recording apparatus, which is set to a value derived from the equation (6). 12. A line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, wherein K7 and M5 are integers and P is a recording dot pitch in the recording material conveying direction. , A line L7 in which the distance L7 between the adjacent ejection port groups in the recording material transport direction is set to a value derived from L7 = (K7 + 1 / M5) × P (7) formula (7). Type inkjet recording device. 13. A line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, wherein K8 and M6 are integers and P is a recording dot pitch in the recording material conveying direction. , L8 = (K8-1 / M6) × P (8) The distance L8 in the recording material conveyance direction between the adjacent ejection port groups is set to a value derived from the equation (8). Line type recording device. 14. A line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, wherein K9 is an integer, N3 is the number of ejection port groups, and P is P.
Is the recording dot pitch in the recording material conveyance direction, the distance L9 in the recording material conveyance direction between adjacent ejection port groups is L9 = (K9 + 1 / N3) × P (9) Equation (9) A line type recording device characterized by being set to a value that is more guided. 15. A line type ink jet recording apparatus having a plurality of ejection port groups divided in the recording material conveying direction, wherein K10 is an integer and N4 is the number of ejection port groups.
When P is the recording dot pitch in the recording material conveyance direction,
It is characterized in that the distance L10 in the recording material conveyance direction between the adjacent ejection port groups is set to a value derived from L10 = (K10-1 / N4) × P (10) equation (10). Line type recording device.