JPH09300657A - Image-forming device of ink-jet system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wasteful ink consumption and poor image formation by a method wherein the number of ink delivery times is weighted by multiplying with the predetermined coefficient corresponding to a head temperature so as to control a suction device for forcibly sucking ink from ink delivery ports and a recording head based on the resultant weighted number of times. SOLUTION: The first forced suction performed is executed after the mounting of a carriage onto a recording head and before the starting of printing at the step S1. At this time, an ink discharging number memory is cleared at the step S2. Next, when printing is started at the step S3, a head temperature is measured with a head temperature sensor at the step S4. Ink discharging number is counted on the basis of printing signal at the step S5. Further, the ink discharging number is weighted by multiplying the ink discharging number with the predetermined coefficient corresponding to the head temperature at the step S6. The resultant ink discharging number is added to the ink discharging number memory at the step S7. When the sum of the ink discharging number reaches 13×10<7> , the recording head is moved above a suction device so as to forcibly such ink from ink delivery ports by means of the suction device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inkjet type image forming apparatus for forming an image on a recording sheet by ejecting ink based on image information.

[0002]

2. Description of the Related Art As one of output devices of computers and workstations, there is known an ink jet type image forming apparatus which forms an image on recording paper by discharging ink. This inkjet type image forming apparatus is, for example,
A plurality of ink ejection holes for ejecting ink are formed, and a recording head that reciprocates in a predetermined direction and a conveyance device that intermittently conveys the recording paper in a direction (recording paper conveyance direction) orthogonal to the predetermined direction are provided. ing. When forming an image on the recording paper, for example, the recording paper being conveyed by the conveying device is temporarily stopped, and the recording head is reciprocated in the above-described predetermined direction, while the image is formed in the image forming area in front of the ink ejection holes. Ink is ejected from any one of a plurality of ink ejection holes on a recording sheet located on the basis of image information sent to the recording head.
Form an image for the band (printing, drawing, etc.), then
The operation of conveying the recording paper for a predetermined length and forming an image for the next band on the new surface located in the image forming area is repeated.

In the recording head of the above-mentioned ink jet type image forming apparatus, ink flow paths (liquid paths), electrothermal converters and the like are formed by using semiconductor manufacturing technology, and ink is produced by utilizing thermal energy. Ink is ejected from the ejection hole.

In such an ink jet type image forming apparatus, since ink (recording liquid) is directly ejected from the recording head to perform recording, it is necessary to always keep the ink in an ejectable state. There are problems that other types of recording devices do not have. For example, if air bubbles are mixed in an ink flow path for supplying ink to the ink ejection holes or an ink reservoir (common liquid chamber) that accommodates ink supplied to each of the plurality of ink ejection holes, There is a problem in that the air bubbles hinder the supply of ink to the ink ejection holes and the ink is not ejected.

The causes of inclusion of air bubbles are as follows. 1. The dissolved gas in the ink becomes bubbles due to the heat of the recording head. Such bubbles are more likely to occur as the temperature of the ink is higher. 2. The ratio of the number of simultaneously ejecting ink among these plural ink ejection holes to the total number of plural ink ejection holes (print duty) is high. Above that, bubbles are generated due to boiling of the ink in the recording head.

In order to solve the above problem, conventionally, the number of times ink is ejected from a plurality of ink ejection holes (the number of ink ejections) is counted based on image information sent to a recording head, and this value is a predetermined value. When it exceeds the value, the ink is forcibly discharged from the ink discharge hole.

[0007]

However, in the conventional technique in which ink is forcibly discharged from the ink ejection holes when the number of ejected ink exceeds a predetermined value, the temperature of the recording head during printing and recording Since the degree of bubble generation changes depending on the ambient temperature of the head (environmental temperature, ink temperature), ink may be forcibly discharged before it becomes impossible to eject ink, or vice versa. In some cases, it may be impossible to eject ink before the ink is discharged.

In view of the above circumstances, the present invention makes it impossible to eject ink forcibly before it becomes impossible to eject ink, or vice versa. It is an object of the present invention to provide an inkjet type image forming apparatus that prevents the occurrence of blemishes.

[0009]

The first ink jet type image forming apparatus of the present invention for achieving the above object comprises:
While moving the recording head in which a plurality of ink ejection holes for ejecting ink are formed in a predetermined direction, the ink is ejected on the recording paper located in the image forming area in front of the plurality of ink ejection holes based on the image information. In an inkjet type image forming apparatus that forms an image by ejecting ink from a hole, (1) a head temperature measuring device that measures the temperature of the recording head (2) count the number of times ink is ejected from the plurality of ink ejection holes A first arithmetic unit for weighting the number of times by multiplying the number of times by a predetermined coefficient corresponding to the temperature measured by the head temperature measuring device (3) moving in the predetermined direction and moving away from the image forming area A suction device that faces the plurality of ink ejection holes of the recording head and forcibly sucks ink from the plurality of ink ejection holes (4) A first controller that controls the suction device and the recording head so that the suction device forcibly sucks ink from the plurality of ink ejection holes based on the number of times weighted by the first computing device. It is characterized by that.

Further, in a second ink jet type image forming apparatus of the present invention for achieving the above object, the plurality of the ink jet type image forming apparatuses are moved while moving a recording head having a plurality of ink ejecting holes for ejecting ink in a predetermined direction. In the ink-jet type image forming apparatus, which forms an image by ejecting ink from the ink ejection hole based on image information on a recording paper located in the image forming area in front of the ink ejection hole, (5) the plurality of inks A print duty calculating device for calculating the ratio of the number of ink ejected simultaneously from the plurality of ink ejection holes to the total number of ejection holes (6) Counting the number of times ink is ejected from the plurality of ink ejection holes A second coefficient for weighting the number of times by multiplying the number of times by a predetermined coefficient corresponding to the ratio calculated by the arithmetic unit (7) A suction device that moves in the predetermined direction and faces the plurality of ink ejection holes of the recording head away from the image forming area, and that forcibly sucks ink from the plurality of ink ejection holes. ) A second controller for controlling the suction device and the recording head so that the suction device forcibly sucks ink from the plurality of ink ejection holes based on the number of times weighted by the second arithmetic device. It is characterized by having.

Further, in a third ink jet type image forming apparatus of the present invention for attaining the above object, the plurality of ink jet type image forming apparatuses are moved in a predetermined direction while moving a recording head having a plurality of ink ejecting holes for ejecting ink. In an ink jet system image forming apparatus that forms an image by ejecting ink from the ink ejection hole on the basis of image information on a recording paper located in the image forming area in front of the ink ejection hole, (9) Ambient temperature measuring device for measuring ambient temperature (10) Count the number of times ink is ejected from the plurality of ink ejection holes, and multiply the number by a predetermined coefficient corresponding to the temperature measured by the ambient temperature measuring device. By this, the third arithmetic unit for weighting the number of times (11) The recording head is moved in the predetermined direction and separated from the image forming area. Suction device for forcibly sucking ink from the plurality of ink discharge holes facing the ink discharge holes (12). The suction device discharges the plurality of inks based on the number of times weighted by the third arithmetic device. A third control device for controlling the suction device and the recording head to forcibly suck the ink from the hole is provided.

Further, in a fourth ink jet type image forming apparatus of the present invention for achieving the above object, the plurality of ink jetting holes for ejecting ink are moved in a predetermined direction while the plurality of ink jetting holes are moved in a predetermined direction. In an ink jet system image forming apparatus that forms an image by ejecting ink from the ink ejection hole based on image information on a recording sheet located in an image forming area in front of the ink ejection hole of (13): Head temperature measuring device for measuring temperature (14) Facing the plurality of ink ejection holes of the recording head moving in the predetermined direction and separated from the image forming area, ink is forcibly ejected from the plurality of ink ejection holes. Suction device for sucking (15) The suction device discharges the plurality of inks based on the temperature measured by the head temperature measuring device. It is characterized in further comprising a fourth control device for controlling the suction device and the recording head so as forcibly sucking ink from.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a schematic configuration of a first embodiment of an ink jet type image forming apparatus of the present invention.

The ink jet type image forming apparatus 10 is
A platen 14 is provided on which the recording paper 12 conveyed in the direction of arrow A by a conveying device (not shown) is placed. Above the platen 14, parallel to the platen 14, 2
A book guide rail 16 is arranged. The guide rail 16 is moved in the direction of arrow B (which is an example of the predetermined direction referred to in the present invention and is orthogonal to the direction of arrow A) by a belt 20 and a drive motor (not shown) that are wound around a pulley 18. A carriage 22 is fixed so that it can reciprocate. A recording head 24 having a plurality of ink ejection holes (not shown) for ejecting ink is mounted on the carriage 22. When the recording head 24 is located above the platen 14, the ink ejection holes face the image forming area C in front of the ink ejection holes. Inkjet image forming apparatus 10
Then, a suction device 26 for forcibly sucking the ink from the ink ejection holes is arranged at a position apart from the image forming area C on one side of the movable range of the carriage 22. Further, a head temperature sensor (which is an example of the head temperature measuring device according to the present invention) for measuring the temperature of the recording head is incorporated in the recording head 24, and the head temperature rising with printing is measured. . Furthermore, the inkjet type image forming apparatus 10 carries the recording head 24 based on the print signal that carries the image information and is transmitted to the recording head 24.
The number of times ink is ejected from a plurality of ink ejection holes (the number of ink ejections) is counted, and the number of ink ejections is multiplied by a predetermined coefficient corresponding to the temperature measured by the head temperature sensor to weight the number of ink ejections. A first arithmetic unit (not shown) is provided. Further, the inkjet type image forming apparatus 10 also includes an ink ejection number memory (not shown) for storing a total of weighted ink ejection numbers described later.

FIG. 2 is a perspective view showing a schematic structure of the suction device 26.

The suction device 26 is provided with a cap 28 which surrounds the outlets of the plurality of ink ejection holes formed in the recording head 24 in a state of being blocked from the outside, and a suction pump 30 connected to the cap 28. The discharge side of the suction pump 30 is connected to a waste ink tank (not shown) via a waste ink passage 32. The suction device 26 is configured to be able to freely move up and down by a solenoid or the like, and is raised when the recording head 24 moves above the cap 28 to forcibly suck the ink from the ink ejection hole. It is controlled by a first controller (not shown).

The ink jet type image forming apparatus 1 of FIG.
0, when forming an image on the recording paper 12, the recording paper 12 is placed on the platen 14, and the recording paper 12 is held by a conveyance roller (not shown) and a pinch roller (not shown), The transport roller is rotated by (not shown) to transport in the direction of arrow A. The carriage 22 is reciprocated in the direction of arrow B above the recording paper 12, and ink is ejected from the ink ejection holes based on the print signal transmitted from the first controller to the recording head 24 to form an image on the recording paper 12. To do. During the printing operation (image forming operation), the suction device 26 and the recording head 24 are controlled by the first control device so that the suction device 26 forcibly sucks the ink from the plurality of ink ejection holes of the recording head 24.

Next, with reference to FIG. 3, description will be given of forced suction for forcibly sucking ink from the plurality of ink ejection holes by the suction device 26.

FIG. 3 is a sequence diagram showing the procedure of forced suction.

The first forced suction is performed before mounting the recording head 24 on the carriage 22 and starting the printing operation (S1). In this first forced suction, the carriage 22 is moved so that the recording head 24 mounted on the carriage 22 (see FIG. 1) moves above the suction device 26.
The drive motor for moving the arrow mark in the direction of arrow B is controlled by the first controller. Further, when the carriage 22 moves to above the suction device 26, the suction device 26 is controlled by the first control device so that the suction device 26 moves up to forcibly suck the ink from the ink ejection hole. Further, before starting the printing operation, the ink ejection number memory for storing the total of the weighted ink ejection numbers, which will be described later, is cleared (S2).

When printing is started (S3), the head temperature is measured by the head temperature sensor (S4), and at the same time, the first arithmetic unit counts the number of inks generated based on the print signal (S5). The first arithmetic unit further weights the ink ejection number by multiplying the ink ejection number by a predetermined coefficient corresponding to the head temperature (S6). Here, the coefficient is 1.0 when the head temperature is lower than 26 ° C., 1.1 when the head temperature is 26 ° C. or higher and lower than 36 ° C., 1.2 when the head temperature is 36 ° C. or higher and lower than 46 ° C., and 1 when 46 ° C. or higher and lower than 56 ° C. And was set to 1.4 when the temperature was 56 ° C or higher and lower than 66 ° C.
The number of ink shots may be weighted for each print, for each band, or for each dot.

The thus-weighted ink ejection count is added to the ink ejection count memory (S7), and when the total ink ejection count reaches 13 × 10 ⁷ , the first control unit causes the carriage 22 (see FIG. 1). The suction device 26 and the recording head 24 are controlled such that the recording head 24 mounted on the suction head 26 moves above the suction device 26 and the suction device 26 forcibly sucks the ink from the ink ejection holes (S8). . S8
When is finished, the process returns to S2 and the above operation is repeated.

As a result of weighting the number of ink ejections and forcibly sucking ink in this way, ink is forcibly ejected before ink ejection becomes impossible, and vice versa. Can be prevented from becoming impossible. That is, since the ink can be forcibly sucked according to the degree of bubbles generated during printing, wasteful consumption of ink and defective images can be prevented.

Next, a second embodiment of the ink jet type image forming apparatus of the present invention will be described.

The feature of the second embodiment is that the ratio of the number of ink ejection holes simultaneously ejecting the plurality of ink ejection holes to the total number of the plurality of ink ejection holes (print duty).
A point provided with a print duty calculation device for calculating
In place of the first arithmetic unit of the embodiment, the number of times ink is ejected from a plurality of ink ejection holes is counted, and the above number is multiplied by a predetermined coefficient corresponding to the ratio calculated by the print duty arithmetic unit. Instead of the point that the second arithmetic unit weights the number of times and the first controller of the first embodiment, the suction unit is forced from the plurality of ink ejection holes based on the number of times weighted by the second arithmetic unit. A second control device for controlling the suction device and the recording head so as to suck the ink is provided, and other configurations are the same as those of the inkjet type image forming apparatus of the first embodiment.

With reference to FIG. 4, description will be given of forced suction for forcibly sucking ink from the plurality of ink ejection holes by the suction device.

The figure is a sequence diagram showing the procedure of forced suction.

The first forced suction is performed before mounting the recording head 24 on the carriage 22 and starting the printing operation (S11). In this first forced suction, the recording head 24 mounted on the carriage 22 (see FIG. 1) is used.
The carriage 2 so that it moves above the suction device 26.
The drive motor for moving 2 in the direction of arrow B is controlled by the second controller. Furthermore, when the carriage 22 moves above the suction device 26, the suction device 26 is controlled by the second control device so that the suction device 26 rises and the ink is forcibly sucked from the ink ejection holes.
Further, before starting the printing operation, the ink ejection number memory for storing the total of the weighted ink ejection numbers, which will be described later, is cleared (S12).

When printing is started (S13), the print duty calculating device calculates the print duty (S14), and the second calculating device counts the number of ink ejected based on the print signal (S15). . The second arithmetic unit further weights the ink number by multiplying the ink number by a predetermined coefficient corresponding to the print duty (S16). Here, the coefficient is 1.0 when the print duty is less than 16%, 1.1 when the print duty is 16% or more and less than 36%, 1.2 when the print duty is 36% or more and less than 56%, and 1 when 56% or more and less than 76%. It was set to 0.3 and set to 1.4 when 76% or more. The number of ink shots may be weighted for each print or for each band.

The thus-weighted ink ejection count is added to the ink ejection count memory (S17), and when the total ink ejection count reaches 13 × 10 ⁷ , the second control unit causes the carriage 22 (see FIG. 1). The recording head 24 mounted on the suction device 26 moves to above the suction device 26.
The suction device 26 and the recording head 24 are controlled so that the ink is forcibly sucked from the ink ejection holes (S18).
When S18 ends, the process returns to S12 and the above-described operation is repeated.

As a result of weighting the number of ink ejections and forcibly sucking ink in this way, ink is forcibly ejected before ink ejection becomes impossible, and vice versa. Can be prevented from becoming impossible. That is, since the ink can be forcibly sucked according to the degree of bubbles generated during printing, wasteful consumption of ink and defective images can be prevented.

Next, a third embodiment of the ink jet type image forming apparatus of the present invention will be described.

The feature of the third embodiment is that an ambient temperature measuring device for measuring the temperature around the recording head is provided in the vicinity of the recording head instead of the head temperature sensor of the first embodiment. Instead of the first arithmetic unit of the embodiment, the number of times the ink is ejected from the plurality of ink ejection holes is counted, and the number of times is obtained by multiplying the number of times by a predetermined coefficient corresponding to the temperature measured by the ambient temperature measuring device. Weighted to 3rd
The suction device forcibly sucks ink from the plurality of ink ejection holes based on the point that the arithmetic device is provided and instead of the first control device of the first embodiment, based on the number of times weighted by the third arithmetic device. As described above, the third control device for controlling the suction device and the recording head is provided, and the other configurations are the same as those of the inkjet image forming apparatus of the first embodiment.

With reference to FIG. 5, description will be given of forced suction for forcibly sucking ink from the plurality of ink ejection holes by the suction device.

FIG. 5 is a sequence diagram showing the procedure of forced suction.

The first forced suction is performed before mounting the recording head 24 on the carriage 22 and starting the printing operation (S21). In this first forced suction, the recording head 24 mounted on the carriage 22 (see FIG. 1) is used.
The carriage 2 so that it moves above the suction device 26.
The drive motor for moving 2 in the direction of arrow B is controlled by the third controller. Furthermore, when the carriage 22 moves above the suction device 26, the suction device 26 is controlled by the third control device so that the suction device 26 rises to forcibly suck the ink from the ink ejection hole.
Further, before starting the printing operation, the ink ejection number memory for storing the total of the weighted ink ejection numbers, which will be described later, is cleared (S22).

When printing is started (S23), the ambient temperature of the recording head is measured by the ambient temperature measuring device (S24), and at the same time, the third computing device counts the number of ink ejected based on the print signal. (S25). The third arithmetic unit further weights the ink ejection number by multiplying the ink ejection number by a predetermined coefficient corresponding to the temperature around the recording head (S26). Here, the coefficient is 1.0 when the ambient temperature is less than 16 ° C., 1.1 when the ambient temperature is 16 ° C. or higher and lower than 21 ° C., 1.2 when the ambient temperature is 21 ° C. or higher and lower than 26 ° C., and 1 when 26 ° C. or higher and lower than 31 ° C. It was set to 0.3 and set to 1.4 at 31 ° C. or higher. The number of ink shots may be weighted for each print, for each band, or for each dot.

The thus-weighted ink ejection count is added to the ink ejection count memory (S27). When the total ink ejection count reaches 13 × 10 ⁷ , the carriage 22 (see FIG. 1) is operated by the third controller. The recording head 24 mounted on the suction device 26 moves to above the suction device 26.
The suction device 26 and the recording head are controlled so that the ink is forcibly sucked from the ink ejection holes (S28). S2
When 8 ends, the process returns to S22 and the above-described operation is repeated.

As a result of weighting the number of ink ejections and forcibly sucking ink in this way, ink is forcibly ejected before ink ejection becomes impossible, or vice versa. Can be prevented from becoming impossible. That is, since the ink can be forcibly sucked according to the degree of bubbles generated during printing, wasteful consumption of ink and defective images can be prevented.

Next, a fourth embodiment of the ink jet type image forming apparatus of the present invention will be described.

The feature of the fourth embodiment is that the first arithmetic unit of the first embodiment is not provided, and instead of the first controller of the first embodiment, it is based on the head temperature measured by the head temperature sensor. In addition, the suction device is provided with a fourth control device that controls the suction device and the recording head so as to forcibly suck the ink from the plurality of ink ejection holes, and the other configuration is the inkjet method of the first embodiment. It is similar to the image forming apparatus.

With reference to FIG. 6, description will be given of forced suction for forcibly sucking ink from the plurality of ink ejection holes by the suction device.

FIG. 6 is a sequence diagram showing the procedure of forced suction.

The first forced suction is performed before mounting the recording head 24 on the carriage 22 and starting the printing operation (S31). In this first forced suction, the recording head 24 mounted on the carriage 22 (see FIG. 1) is used.
The carriage 2 so that it moves above the suction device 26.
The drive motor for moving 2 in the direction of arrow B is controlled by the fourth controller. Further, when the carriage 22 moves above the suction device 26, the suction device 26 is controlled by the fourth control device so that the suction device 26 rises to forcibly suck the ink from the ink ejection hole.

When printing is started (S32), the head temperature is measured by the head temperature sensor, and it is determined whether the head temperature is 85 ° C. or higher (S33). When it is determined that the head temperature is lower than 85 ° C., printing is continued (S34). On the other hand, when the head temperature is determined to be 85 ° C. or higher, the recording head 24 mounted on the carriage 22 (see FIG. 1) moves above the suction device 26 and the suction device 26 causes the ink to be ejected by the fourth control device. The suction device 26 and the recording head are controlled so that the ink is forcibly sucked from the ejection holes (S31). When S31 ends, S3 again
Proceed to step 2 and repeat the above operation.

As a result of the forced suction based on the temperature of the recording head, the ink is forcibly discharged before the temperature of the recording head exceeds the boiling point of the ink and ink cannot be ejected, or vice versa. It is possible to prevent the ink ejection from becoming impossible before the ink is forcibly ejected. That is, since the ink can be forcibly sucked according to the degree of bubbles generated during printing, wasteful consumption of ink and defective images can be prevented.

[0048]

As described above, according to the first ink jet type image forming apparatus of the present invention, the number of times the ink is ejected is multiplied by the predetermined coefficient corresponding to the temperature measured by the head temperature measuring apparatus. By so doing, the suction device and the recording head are controlled so that the suction device forcibly sucks the ink from the plurality of ink ejection holes based on the weighted number. Ink can be forcibly sucked in according to the degree of
It is possible to prevent wasteful consumption of ink and defective images.

Further, according to the second ink jet type image forming apparatus of the present invention, the number of times the ink is ejected is multiplied by the predetermined coefficient corresponding to the print duty calculated by the print duty calculating device, so that the number of times is increased. The suction device and the recording head are controlled so that the suction device forcibly sucks the ink from the plurality of ink ejection holes based on the weighted number of times. Ink can be forcibly sucked in, and wasteful consumption of ink and defective images can be prevented.

Further, according to the third ink jet type image forming apparatus of the present invention, the predetermined number of times corresponding to the recording head ambient temperature measured by the ambient temperature measuring apparatus is multiplied by the number of times the ink is ejected. This number is weighted, and the suction device and the recording head are controlled so that the suction device forcibly sucks the ink from the plurality of ink ejection holes based on the weighted number. In addition, the ink can be forcibly sucked, and wasteful consumption of the ink and defective images can be prevented.

Further, according to the fourth ink jet type image forming apparatus of the present invention, the suction device forcibly sucks the ink from the plurality of ink ejection holes based on the head temperature measured by the head temperature measuring device. Since the suction device and the recording head are controlled as described above, it is possible to forcibly suck the ink in accordance with the degree of bubble generation associated with printing, and it is possible to prevent wasteful consumption of ink and defective images. Also, even if the head temperature rises rapidly when printing on large-size paper, the head temperature during printing is monitored, so ink is forcibly forced when the temperature exceeds a predetermined temperature. It is possible to suck and prevent image defects.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a color plotter which is an example of an inkjet image forming apparatus of the present invention.

FIG. 2 is a perspective view showing a schematic configuration of a suction device of the color plotter of FIG.

FIG. 3 is a sequence diagram showing a procedure of forced suction in the inkjet image forming apparatus according to the first embodiment of the present invention.

FIG. 4 is a sequence diagram showing a procedure of forced suction in the inkjet-type image forming apparatus according to the second embodiment of the present invention.

FIG. 5 is a sequence diagram showing a procedure of forced suction in the inkjet image forming apparatus according to the third embodiment of the present invention.

FIG. 6 is a sequence diagram showing the procedure of forced suction in the inkjet image forming apparatus of the fourth embodiment of the present invention.

[Explanation of symbols]

 10 Inkjet image forming apparatus 12 Recording paper 22 Carriage 24 Recording head 26 Suction device 28 Cap 30 Suction pump 32 Waste ink passage

Claims (4)

[Claims] 1. While moving a recording head having a plurality of ink ejection holes for ejecting ink in a predetermined direction, image information is recorded on a recording paper located in an image forming area in front of the plurality of ink ejection holes. In an inkjet-type image forming apparatus that forms an image by ejecting ink from the ink ejection holes based on a head temperature measuring device that measures the temperature of the recording head, and the number of times ink is ejected from the plurality of ink ejection holes. A first arithmetic unit that counts and weights the number of times by multiplying the number of times by a predetermined coefficient corresponding to the temperature measured by the head temperature measuring device; and moving away from the image forming area by moving in the predetermined direction. A suction device that faces the plurality of ink ejection holes of the recording head and forcibly sucks ink from the plurality of ink ejection holes; A first controller that controls the suction device and the recording head so that the suction device forcibly sucks ink from the plurality of ink ejection holes based on the number of times weighted by the arithmetic device. An inkjet image forming apparatus characterized by the above. 2. The image information is recorded on a recording paper located in an image forming area in front of the plurality of ink ejection holes while moving a recording head having a plurality of ink ejection holes for ejecting ink in a predetermined direction. In an inkjet type image forming apparatus that forms an image by ejecting ink from the ink ejection holes based on the above, the ratio of the number of ink ejected simultaneously among the plurality of ink ejection holes to the total number of the plurality of ink ejection holes is calculated. A print duty calculating device for calculating the number of times ink is ejected from the plurality of ink ejection holes, and the number of times is calculated by multiplying the number by a predetermined coefficient corresponding to the ratio calculated by the print duty calculating device. A second arithmetic unit for weighting, and the plurality of inks of the recording head moved in the predetermined direction and separated from the image forming area Based on the suction device facing the discharge hole and forcibly sucking the ink from the plurality of ink discharge holes, and the suction device is forced from the plurality of ink discharge holes based on the number of times weighted by the second arithmetic device. An inkjet image forming apparatus, comprising: a second control device that controls the suction device and the recording head to suck ink in a desired manner. 3. While moving a recording head having a plurality of ink ejection holes for ejecting ink in a predetermined direction, image information is recorded on a recording paper located in an image forming area in front of the plurality of ink ejection holes. An inkjet type image forming apparatus that forms an image by ejecting ink from the ink ejection holes based on an ambient temperature measuring device that measures a temperature around the recording head, and ink is ejected from the plurality of ink ejection holes. A third arithmetic unit that counts the number of times and weights the number of times by multiplying the number of times by a predetermined coefficient corresponding to the temperature measured by the ambient temperature measuring device; and the image forming area by moving in the predetermined direction. A suction device that faces the plurality of ink ejection holes of the recording head separated from the ink jet head and that forcibly sucks ink from the plurality of ink ejection holes; A third control device that controls the suction device and the recording head so that the suction device forcibly sucks ink from the plurality of ink ejection holes based on the number of times weighted by three calculation devices. An inkjet image forming apparatus characterized by the above. 4. While moving a recording head having a plurality of ink ejection holes for ejecting ink in a predetermined direction, image information is recorded on a recording paper located in an image forming area in front of the plurality of ink ejection holes. An ink jet type image forming apparatus for forming an image by ejecting ink from the ink ejecting hole based on: a head temperature measuring device for measuring the temperature of the recording head; and a head temperature measuring device that moves in the predetermined direction and separates from the image forming area. And a suction device that faces the plurality of ink discharge holes of the recording head and forcibly sucks ink from the plurality of ink discharge holes; and based on the temperature measured by the head temperature measurement device, the suction device is A fourth controller for controlling the suction device and the recording head so as to forcibly suck the ink from the plurality of ink ejection holes. An inkjet image forming apparatus characterized by the above.