JP2003048348A - Ink jet recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a remaining amount and reduce costs by enabling information on a roll paper which changes every moment in accordance with the use of the roll paper to be recorded to the roll paper practically with the use of a bar code or the like. SOLUTION: In reading the information on the roll paper 2 recorded to a side face or a core material of the roll paper, a rotating amount or a rotating speed of the roll paper 2 is detected, and an outer diameter and the remaining amount of the roll paper 2 are calculated from a relation to a transfer length or a transfer speed of the roll paper 2. The information on the roll paper 2 which changes every moment in accordance with the use of the roll paper 2 can be recorded to the roll paper 2 or the core material 1 practically with the use of the bar code or the like. The other control of an ink jet recorder is also enabled while one sensor is shared, so that costs can be reduced.

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 capable of efficiently detecting the remaining amount of various rolled recording media and correcting the curl of the recording medium, which curls strongly as the roll diameter changes.

[0002]

2. Description of the Related Art Generally, a roll paper has a recording material wound around an outer peripheral surface of a core material. And, depending on the type of roll paper,
There are various types of core materials, such as those having different outer diameters and those having different recording paper thicknesses. As a problem peculiar to roll paper, it is difficult to grasp the remaining amount of roll paper, and when the roll paper is conveyed without knowing the remaining amount and the length of the roll paper is insufficient for the image forming area. In addition, the expensive ink is wasted, it takes time to re-execute the image formation, and conversely, the roll paper is replaced even when the remaining amount is sufficient, and the expensive roll paper is replaced. It will be wasted. Further, since the roll paper has a curl, the curl becomes stronger as the roll outer diameter becomes smaller as the roll paper is consumed, and the recording paper on which an image is formed has a unique problem.

As a conventional roll paper remaining amount detecting means, for example, there is one disclosed in Japanese Patent Laid-Open No. 2000-313558. That is, information such as a roll paper unique number, type, size, initial length and thickness is recorded on the side surface of the roll paper using, for example, a bar code, and the length and initial length of the roll paper used can be recorded. The remaining amount of roll paper is detected.

However, in the above-mentioned conventional remaining amount detecting means, since the information on the used length which changes according to the use cannot be recorded on the side surface of the roll paper by a bar code or the like, the used length is stored. It is necessary to provide a non-volatile memory or the like in order to store the data, which causes a problem of high cost.

In addition, for example, when a roll paper used halfway is replaced with another roll paper to form an image and the roll paper used halfway is set again to be used again, a wide variety of rolls are used. There is a problem that the control system becomes complicated because it is necessary to attach each unique number to the paper and store the information on the corresponding used length. Also, when using one roll paper by replacing it with multiple recording devices, the recording medium usage length stored in each recording device and the total usage length actually used by multiple printers are inconsistent, and the correct roll paper is used. There is a problem that the remaining amount cannot be detected.

Further, since it is not possible to record the information on the roll diameter, which changes every moment depending on the use of the roll paper, on the side surface of the roll paper by using a bar code or the like, it is caused by a curl corresponding to the change of the roll diameter. There is a problem that the curl cannot be corrected.

[0007]

SUMMARY OF THE INVENTION The present invention reduces the cost by enabling the roll paper to record information on the roll paper which changes with the use of the roll paper substantially by using a bar code or the like. (EN) Provided is an inkjet recording device capable of correcting a curl generated according to a change in roll outer diameter.

[0008]

In order to solve the above-mentioned problems, the means according to claim 1 conveys a roll-shaped recording medium by a conveying means and is recorded in advance on the side surface or core material of the recording medium. In an inkjet recording apparatus that reads recording medium information with a sensor and refers to this information to eject ink from an inkjet head to record on the recording medium, the amount of rotation of the roll-shaped recording medium when the recording medium information is read by the sensor. Alternatively, the rotation speed is detected, and the remaining amount of the recording medium is calculated from the rotation amount or the rotation speed and the conveyance amount or the conveyance speed of the recording medium.

According to a second aspect of the present invention, the roll-shaped recording medium is conveyed by the conveying means, the recording medium information previously recorded on the side surface of the recording medium or the core material is read by the sensor, and the information is referred to. In an inkjet recording apparatus that ejects ink from an inkjet head to record on a recording medium, when the recording medium information is read by the sensor, the recording medium information includes an outer diameter of a core material of the recording medium and a thickness of the recording medium. The rotation amount or rotation speed of the roll-shaped recording medium is detected, and the rotation amount or rotation speed, the conveyance amount or conveyance speed of the recording medium, and the outer diameter of the core material of the recording medium and the thickness of the recording medium are used for recording. The feature is that the remaining amount of the medium is calculated.

According to a third aspect of the present invention, the roll-shaped recording medium is conveyed by the conveying means, the recording medium information previously recorded on the side surface of the recording medium or the core material is read by the sensor, and the information is referred to. In an inkjet recording apparatus that ejects ink from an inkjet head to record on a recording medium, when the recording medium information is read by the sensor, the rotation amount or the rotation speed of the roll-shaped recording medium is detected, and the rotation amount or the rotation speed is detected. The remaining amount of the recording medium is calculated from the conveying amount or the conveying speed of the recording medium, and the calculated remaining amount of the recording medium is compared with the length of the image to be recorded in the recording medium conveying direction. Is smaller than the sum of the length of the image to be recorded in the recording medium conveyance direction and the length of the blank space required before and after the image, an error is notified and recording is not started.

According to a fourth aspect of the present invention, the roll-shaped recording medium is conveyed by the conveying means, the recording medium information previously recorded on the side surface of the recording medium or the core material is read by the sensor, and the information is referred to. In an inkjet recording apparatus that ejects ink from an inkjet head to record on a recording medium, when the recording medium information is read by the sensor, the recording medium information includes an outer diameter of a core material of the recording medium and a thickness of the recording medium. A rotation amount or a rotation speed of the roll-shaped recording medium is detected, and the rotation amount or the rotation speed, the conveyance amount or the conveyance speed of the recording medium, the outer diameter of the core material of the recording medium, and the thickness of the recording medium are used to determine the recording medium. The remaining amount of the recording medium is calculated and the calculated remaining amount of the recording medium is compared with the length of the image to be recorded in the recording medium conveyance direction. Characterized in that it does not start recording and notifies an error when less than the sum of the length and the image length of the margin required for the front and rear.

According to a fifth aspect of the present invention, the roll-shaped recording medium is conveyed by the conveying means, the recording medium information previously recorded on the side surface of the recording medium or the core material is read by the sensor, and the information is referred to. In an inkjet recording apparatus that ejects ink from an inkjet head to record on a recording medium, when the recording medium information is read by the sensor, the rotational amount or rotational speed of the roll-shaped recording medium is detected in the previous period, and the rotational amount or rotational speed is detected. The outer diameter of the roll of the recording medium is estimated from the conveyance amount and the conveyance speed of the recording medium, and the curl straightening means is operated according to the outer diameter of the roll.

According to a sixth aspect of the present invention, a display unit for displaying the remaining amount of the recording medium is provided.

According to a seventh aspect of the present invention, when the remaining amount of the recording medium falls below a predetermined value, an alarm is issued.

According to an eighth aspect of the present invention, the recording medium information includes information on the type of the recording medium or the ink absorption capacity of the recording medium, and based on the information, the ink ejection amount per unit area for predetermined input data. It is characterized by controlling.

According to a ninth aspect of the present invention, the recording medium information includes information regarding the type of recording medium or the ink absorption speed of the recording medium, and based on the information, the ink ejection amount per unit time for predetermined input data. It is characterized by controlling.

According to a tenth aspect of the present invention, the recording medium information includes information on the type of recording medium or a compatible recording condition, and the recording condition is controlled based on the information.

The means according to claim 11 is characterized in that the recording medium information includes information on the type of recording medium or the diameter of dots to be recorded, and the ink droplet volume and density are controlled based on the information. To do.

According to a twelfth aspect of the present invention, the recording medium information includes information on the type of the recording medium or the color development of the ink, and controls the color and gradation of the image to be recorded based on the information. To do.

According to a thirteenth aspect of the present invention, the recording medium information includes information regarding the type of recording medium or the drying time of ink recorded on the recording medium, and the time interval during continuous recording is controlled based on the information. It is characterized by doing.

According to a fourteenth aspect of the present invention, the recording medium information includes information on the type of recording medium or heat fixing conditions of the recording medium, and the heat fixing conditions are controlled based on the information.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. In FIG. 1, a roll paper 2 (recording medium) wound around a core material 1 is rotatably supported by supporting both ends of a shaft 3 inserted in the core material 1 by bearing members 4. Then, the roll paper 2 is conveyed while being sandwiched between the conveyance roller 5 and the driven roller 6 whose rotation is controlled by the conveyance motor 14. An image is formed on the roll paper 2 thus conveyed by the ink ejected from the recording head 7 which moves in the arrow direction along the guide bar 8,
It is cut into a predetermined length by a cutter 9 which moves in the arrow direction. The cut roll paper 2 is further sandwiched between the heating roller 10 and the pressure-bonding roller 11 and conveyed, where the ink is dried and fixed, and is accumulated as a product 13 on the tray 12.

On the side surface of the roll paper 2, as shown in FIG. 5, a start mark 15 and roll paper information 16 are recorded. The start mark 15 has a different line thickness so that it can be distinguished from the roll paper information 16. The roll paper information 16 is, for example, a bar code. And FIG.
As shown in, a sensor 17 is provided at a position where the start mark 15 and the roll paper information 16 can be detected.

Further, a start mark 15 and roll paper information 16 may be recorded on the side surface of the core material 1 as shown in FIG. Similarly, the start mark 15 has different line lengths so that it can be distinguished from the roll paper information 16. The roll paper information 16 is, for example, a bar code. Then, as shown in FIG. 8, this start mark 1
5 and the sensor 17 at a position where the roll paper information 16 can be detected.
To provide.

Since the number of rotations of the roll paper 2 can be detected by providing the start mark 15 in this way, the remaining amount of the roll paper 2 can be obtained as follows. That is, if the length of the roll paper 2 conveyed during one rotation of the roll paper 2 (core material 1) is l and the roll outer diameter at that time is D, a relationship of D = 1 / π is established between the two. To establish. Here, π is the circular constant. Then, the inner diameter of the roll paper 2 (outer diameter of the core material 1) is d (see FIG. 7), and the thickness of the roll paper 2 is t.
Then, the remaining amount L is as follows.

[0026]

[Formula 1]

The recording medium information 16 includes the outer diameter d of the core material 1,
The thickness t of the roll paper is coded and recorded. In FIG. 1, the control unit 19 controls the rotation of the carry motor 14 via the motor driver 23 to carry the roll paper 2,
The recording medium information 16 is read by the sensor 17, and the outer diameter d of the core material and the thickness t of the roll paper are detected by the recording medium remaining amount detector 18.
Is decoded as. In addition, the recording medium remaining amount detection unit 18
In addition to the start mark signal input from the sensor 17, the motor rotation control signal is input from the control unit 19 to detect the carry amount l per one rotation of the roll paper, and the calculation of the formula (1) is performed to leave the recording medium remaining. The amount L is calculated and input to the control unit 19.

In this way, the remaining amount L of the roll paper 2 input to the control unit 19 is output to the display means 20. Further, the recording medium information 16 is coded including the roll paper name, width, manufacturer, product number, lot number, date of manufacture, place of production, etc., and the signal read by the sensor 17 is controlled by the control unit 19. The information is decoded by and is displayed on the display unit 20. Further, the recording medium information 16 is encoded including compatible ink information, compatible printer information, compatible recording conditions, etc., and the signal read by the sensor 17 is decoded by the control unit 19, and the control unit 19 is decoded by the compatible medium. When the conditions are not met, the error notification means 22 outputs the data and recording is not started. In addition, in the recording medium information 16,
The heating temperature of the heating roller 10 and the pressure force of the pressure roller 11 are coded, and the signal read by the sensor 17 is decoded by the controller 19 and the controller 1
9 is a decoded condition, and heating and pressure bonding are performed.

Since the recording medium information is read out and displayed in this manner, the user's work error can be prevented, and the processing is performed under the conditions suitable for the recording medium, so that stable quality can be obtained. In addition, the amount of rotation of the recording medium is detected to calculate and display the remaining amount of the recording medium, and the amount of remaining recording medium is displayed. Further, since the reading of the recording medium information 16 and the recording medium rotation amount detection for calculating the remaining amount of the recording medium are performed by one sensor 17, the cost can be reduced.

In the control unit 19, the input remaining amount L
And the length of the image to be recorded in the conveyance direction of the roll paper 2 are compared, and the remaining amount L is close to the sum of the length of the image to be recorded in the conveyance direction of the roll paper 2 and the length of the margin required before and after the image. Sometimes, it outputs to the recording medium remaining amount warning means to issue an alarm, and when the remaining amount L is smaller than the sum, it outputs to the error notifying means 22 to stop the recording head 7 or the conveyance motor 14.
As a result, the user can know the remaining amount of the roll paper 2 and the recording head 7 or the transport motor 14 is stopped, so that the wasteful consumption of expensive ink due to the roll paper running out is eliminated, and the image formation is redone. It is possible to eliminate unnecessary time consumption.

Further, according to the method described above, even if the roll paper 2 is replaced with another roll paper 2 which is being used while the roll paper 2 is being used, the recording medium information 16 and the start mark 15 are provided each time.
Can be read by the sensor 17, and the roll paper information after replacement and the remaining amount L of the roll paper 2 can be detected.

The start mark 15 is recorded on the side surface of the roll paper 2 or the core material 1 shown in FIG.
The basic configuration in which the rotation speed of the roll paper 2 is detected by the start mark 15 and the remaining amount L and the roll outer diameter D are calculated based on this rotation speed can be applied to various inkjet recording apparatuses. This will be described below.

The embodiment shown in FIG. 2 comprises a sensor 17, a recording medium remaining amount calculation section 18, and a control section 19 as a basic configuration. Then, the roll paper information 16 includes roll paper information such as the ink absorption amount, the ink absorption speed, the ink drying time, and the dot diameter. In this embodiment, an image data input unit 24 for inputting image data to be recorded, a color gradation conversion unit 26 for converting colors and gradations, an error diffusion processing unit for converting multi-valued image data into binary data. 26, a head driver 27 that controls the recording head 7, and a motor driver 28 that controls the scanning speed (arrow direction) of the recording head 7 by controlling the rotational speed of the motor 29 to move the belt 30. Then, in response to this control, the motor driver 23
Is controlled to drive the driving roller 5 to convey the roll paper 2.

Also in this control system, all the control is possible by one sensor 17 only by increasing the roll paper information 16, and the remaining amount L is detected, and the roll paper 2 input to the control unit 19 is detected. The remaining amount L is output to the display means 20, and the control unit 19 compares the input remaining amount L with the length of the image to be recorded in the transport direction of the roll paper 2,
When the remaining amount L is close to the sum of the length of the image to be recorded in the conveyance direction of the roll paper 2 and the length of the margin required before and after the image, the remaining amount L is output to the recording medium remaining amount warning means to issue an alarm, When the remaining amount L is small, it is output to the error notifying means 22 and the recording head 7 or the carry motor 14 is stopped. This allows the user to know the remaining amount of the roll paper 2 and also to stop the recording head 7 or the transport motor 14,
It is possible to eliminate the wasteful consumption of expensive ink due to the roll paper running out, and to eliminate the wasteful consumption of time by eliminating the need to redo image formation. Further, since only one sensor 17 is required, the cost can be reduced and the control system can be simplified.

In the embodiment shown in FIG. 3, the line head 7 is used.
The basic configuration shown in FIG. 1 is applied to the ink jet recording apparatus using the above. This embodiment also has a basic configuration of a sensor 17, a recording medium remaining amount calculation unit 18, and a control unit 19, as in the case shown in FIG. The roll paper information 16 recorded on the side surface of the roll paper 2 or the side surface of the core material 1 includes roll paper information such as ink absorption amount, ink absorption speed, ink drying time, and dot diameter. In this embodiment, an image data input unit 24 for inputting image data to be recorded, a color gradation conversion unit 26 for converting colors and gradations, an error diffusion process for converting multi-valued image data into binary image data. A head driver 27 that controls the unit 26 and the recording head 7 is provided. In response to this control, the motor driver 23 is controlled to drive the drive roller 5 to convey the roll paper 2.

Also in this control system, all the control is possible by one sensor 17 only by increasing the roll paper information 16, and the remaining amount L is detected and the roll paper 2 input to the control unit 19 is detected. The remaining amount L is output to the display means 20, and the control unit 19 compares the input remaining amount L with the length of the image to be recorded in the transport direction of the roll paper 2,
When the remaining amount L is close to the sum of the length of the image to be recorded in the conveyance direction of the roll paper 2 and the length of the margin required before and after the image, the remaining amount L is output to the recording medium remaining amount warning means to issue an alarm, When the remaining amount L is small, it is output to the error notifying means 22 and the recording head 7 or the carry motor 14 is stopped. This allows the user to know the remaining amount of the roll paper 2 and also to stop the recording head 7 or the transport motor 14,
It is possible to eliminate the wasteful consumption of expensive ink due to the roll paper running out, and to eliminate the wasteful consumption of time by eliminating the need to redo image formation. Further, since only one sensor 17 is required, the cost can be reduced and the control system can be simplified.

The embodiment shown in FIG. 4 is an application of the basic structure shown in FIG. 1 to an ink jet recording apparatus having a curl correcting means. First, the curl correcting means will be described. Rolls 37 and 38 corresponding to the heating roller 10 and the pressure roller 11 are provided, and endless belts 39 and 40 are hung on the respective rollers. Then, a roller 41 corresponding to the roller 38 is provided, and the rollers 38 and 4
Hang the endless belt 42 on 1. The roller 41 is
A motor provided on the shaft of the roller 38 can swing to a position 41 '.

The curl correcting means having such a structure can be controlled as follows. That is, roll paper 2
The roll outer diameter D, which changes momentarily by using, detects the rotation of the roll paper 2 by the start mark 15 detected by the sensor 17 as in FIG. It can be calculated by π (π is the circular constant).

The strength of the curl depends on the roll outer diameter D, the thickness t, and the material of the roll paper 2. Further, the outer diameter Dc of the roll with respect to the strength of the curl that needs to be corrected can be uniquely determined in advance by the thickness t and the material of the roll paper 2. Therefore, the roll paper information 16 includes the thickness t and the material of the roll paper 2, and this is detected by the sensor 17, and the control of the motor driver 33 is started when the roll outer diameter Dc is required to correct the curl. , The swing angle α of the roller 41 is controlled to increase as the roll outer diameter D decreases. In this way, using the common sensor 17,
The curl can be corrected, the cost can be reduced, and the control system can be simplified. Further, since the curl is corrected, the product 1 accumulated on the tray 13
3 is not disturbed, and bending and wrinkles can be prevented.

Next, the heating roller 10 and the pressure roller 11
The control of will be described. In this case, roll paper information 16
Includes roll paper information such as ink absorption amount, ink absorption speed, ink drying time, dot diameter, and the like. The roll paper information 16 is detected by the sensor 17 and is output to the pressure control unit 31 and the temperature control unit 32, respectively.
The rotation of the motor 34 is controlled by, the rotation angle of the eccentric cam 35 is adjusted, and the pressure roller 11 is pressure-bonded to the heating roller 10 with the adjusted pressure by the elastic force of the spring 36. On the other hand, the temperature controller 32 adjusts the heating temperature of the heating unit 10. As a result, the roll paper information 16
Ink absorption amount, ink absorption speed, ink drying time,
The ink is dried and fixed by the optimum temperature and pressure for dot diameter and the like to prevent the ink from bleeding or rubbing on the recording medium and to obtain a high quality image.

Next, the common control system shown in FIGS. 2 to 4 will be described. First, the control of the ejection amount of ink per unit area for the roll paper 2 will be described based on the roll paper information 16 regarding the ink absorption amount. There are two control methods, one is to change the number of dots, and the other is to change the volume of ink droplets.

First, in order to control the ink ejection amount by changing the number of dots, the sensor 17 detects the information on the ink absorption amount of the roll paper 2 and inputs it to the control unit 19 to determine the ink absorption amount. Error diffusion processing unit 2
It is performed by outputting to 6 and correcting the parameter of the number of dots per unit area. Then, the head driver 27 controls the recording head 7 on the basis of the corrected parameters to control the ink ejection amount per unit area. Also in this case, the common sensor 17 is used.

Next, in order to change the volume of the ink droplet to control the ink ejection amount, the sensor 17 is used to roll the roll paper 2.
Of the ink absorption amount is detected and input to the control unit 19, a drive voltage corresponding to the ink absorption amount is output to the head driver 27, and the volume of the droplet is changed according to the change of the drive voltage. , Controlling the amount of ink ejected per unit area. Also in this case, the common sensor 17 is used.

Next, based on the roll paper information 16 relating to the ink absorption speed, the control of the ink ejection amount per unit time to the roll paper 2 will be described. There are five control methods. The following will be described in order.

The first control method is to change the scanning speed of the recording head 7 and the ink ejection period. In this control method, the sensor 17 detects ink absorption speed information from the roll paper information 16 and inputs this to the control unit 19 to control the motor driver 28 (see FIG. 2) to adjust the rotation speed of the motor 29. Then, the scanning speed of the recording head 7 is controlled via the belt 30, and at the same time, by controlling the head driver 27 in synchronization with the scanning of the recording head 7, the ink ejection cycle of the recording head 7 is changed. Let

The second control method is to change the waiting time at both ends of the recording head 7. In particular,
The sensor 17 detects the ink absorption speed information from the roll paper information 16 and inputs this to the control unit 19 to control the motor driver 28 (see FIG. 2) to adjust the rotation of the motor 29 and the belt 30. The standby time of the recording head 7 is controlled via the. By controlling this waiting time, the amount of ink ejected per unit time on the roll paper 2 is controlled.

The third method is to control the ejection amount of ink per unit area by selecting whether the recording by the recording head 7 is to be performed in the forward path, the backward path, or both the forward path and the backward path. Specifically, the sensor 17 uses the roll paper information 1
6, the ink absorption speed information is detected, and this is detected by the control unit 19
, The motor driver 28 (see FIG. 2) is controlled to adjust the rotation of the motor 29, and the scanning of the recording head 7 is controlled via the belt 30. For example, when the ink absorption speed of the roll paper 2 is high, recording is performed on both the backward and forward paths during scanning, and when the ink absorption speed is low, only on the forward or backward path during scanning. Recording is performed, and by setting and controlling the head driver 27 in this manner, it is possible to control the ink ejection amount per unit time with respect to the roll paper 2.

The fourth method is controlled by changing the number of nozzles used for one scan of the recording head 7. This control is performed by detecting ink absorption speed information from the roll paper information 16 with the sensor 17, inputting this to the control unit 19, and controlling the head driver 27 with the control unit 19. As shown in FIG. 9, the specific control content is that the recording head 7 is provided with a plurality of nozzles 43, and when the ink absorption speed is high, recording is performed using all nozzles to perform ink absorption. When the speed is slow, the head driver 2 should use every other nozzle 43 or every other nozzle 43.
By setting and controlling 7, the ink ejection amount per unit time is controlled.

In the fifth method, when a plurality of recording heads 7 are used, the controller 19 controls the head driver 27 so as to change the number of recording heads 7 used for one scanning. As shown in FIG. 10, when a plurality of recording heads 7 are used (Y: yellow, M: magenta, C: cyan, K: one recording head is used for each color of black), if the ink speed is high, all recording is performed. Heads Y, M, C, and K that are used at the same time and have a medium ink absorption speed are Y and C on the outward path.
Recording is performed, only M and K are recorded in the return path, and for those with a slow ink absorption speed, only Y is recorded in the outward path of the first scan, only M is recorded in the return path, and the outward path of the second run is performed. In this case, only C is recorded, and only K is recorded in the return path. By setting and controlling the head driver 27 in this way, the ink ejection amount per unit time is controlled.

Next, the control of the recording interval time during continuous recording will be described based on the roll paper information 16 regarding the ink drying time. In this control, the roll paper 2 recorded by the recording head 7 stands by at that spot until the ink dries, and is conveyed to the cutter 9 by the drive roller 5 after the ink drying time has elapsed.

Specifically, the sensor 17 detects information on the drying time from the roll paper information 16, inputs this information to the control unit 19, controls the motor driver 23 to drive the carry motor 14, and carry Road 5 is rotated intermittently according to the required waiting time.

Next, based on the dot diameter data,
Control of ink droplet volume or recording density will be described. Specifically, the sensor 17 detects information about the dot diameter from the roll paper information 16, inputs this information to the control unit 19, controls the head driver 27, and ejects ink onto the recording surface of the roll paper 2. At this time, the drive voltage supplied to the recording head 7 is controlled so that the volume of the ink droplet spreads the ink to the designated dot diameter.

In order to control the recording density, the sensor 17 detects, from the roll paper information 16, information about the dot diameter, information about the type of recording medium or compatible recording conditions, or information about the color development of the ink. It is input to the control unit 19, the parameter of the number of dots is corrected by the error diffusion processing unit 26, and the number of dots per unit area is changed.

Thus, with one sensor 17, the remaining amount L of the roll paper 2, the curl correction by the outer diameter D of the roll paper 2, the ink ejection amount per unit area and the ink ejection amount per unit time. Control to prevent image deterioration due to ink agglomeration on the roll paper 2 and image graininess, and control the waiting time until drying to transfer or rub the products 13 from each other when they are stacked on the tray. To prevent image distortion due to
It is possible to perform control such as ensuring a necessary and sufficient density by controlling the droplet volume or recording density that achieves the required dot diameter.

In the above description, the roll outer diameter D and the remaining amount L are calculated from the transport amount 1 per rotation of the roll paper 2, but from the signal speed when the recording medium information 16 is read by the sensor 17. The roll rotation speed ω may be detected, and the roll paper outer diameter D may be calculated from the relationship with the roll paper transport speed v. In this case, D = 2v / ω can be calculated.

[0056]

According to the first and second aspects of the present invention, when the roll paper information recorded on the side surface of the roll paper or the core material is read, the rotation amount or rotation speed of the roll paper is detected. Since the remaining amount of roll paper can be calculated from the relationship between the roll paper transport amount or transport speed, the roll paper information that changes momentarily as the roll paper is used can be rolled using a bar code, etc. It is possible to record on paper or a core material, share one sensor, enable other control of the inkjet recording apparatus, reduce the cost, and simplify the control system. Furthermore, since the remaining amount is calculated using the thickness of the roll paper and the outer diameter of the core material as parameters, it is possible to deal with various roll papers having different thicknesses and outer diameters of the core material.

According to the third aspect of the present invention, the calculated remaining amount of the recording medium is compared with the length of the image to be recorded in the recording medium conveyance direction, and the remaining length of the recording medium corresponds to the image to be recorded. An error is notified and recording is not started when the length is smaller than the sum of the length in the recording medium conveyance direction and the length of the margins required before and after the image, so wasteful consumption of expensive ink and roll paper is eliminated. At the same time, it is possible to prevent the print from being redone and save the time for the redone.

According to the fourth aspect of the present invention, when the roll paper information recorded on the side surface of the roll paper or the core material is read, the rotation amount or rotation speed of the roll paper is detected, and the roll paper conveyance amount or The remaining amount of roll paper is calculated from the relationship with the conveyance speed, and the calculated remaining amount of the recording medium is compared with the length of the image to be recorded in the recording medium conveying direction, and the remaining length of the recording medium is recorded. The error is notified and recording is not started when it is smaller than the sum of the length of the power image in the recording medium conveyance direction and the length of the margin required before and after the image. This makes it possible to cope with roll papers having different diameters, eliminate wasteful consumption of expensive ink and roll paper, prevent redoing of printing, and save redoing time.

According to the fifth aspect of the present invention, when the roll paper information recorded on the side surface of the roll paper or the core material is read, the rotation amount or the rotation speed of the roll paper is detected and the roll paper conveyance amount or The remaining amount of roll paper is calculated from the relationship with the transport speed, and the curl is corrected by driving the curl correcting unit according to the outer diameter of the roll, so the curl and wrinkles of the products accumulated in the tray are eliminated, Product value can be increased.

According to the inventions of claims 6 and 7, it is possible to inform the user of the remaining amount of the recording medium by providing a display portion for displaying the remaining amount of the recording medium or by issuing an alarm.

According to the inventions of claims 8 to 14, the recording medium information includes information relating to the recording medium information such as the type of the recording medium and the ink absorption capacity of the recording medium, and a predetermined input is made based on these information. Ink ejection amount per unit area for data, Ink ejection amount per unit time,
By controlling the ink droplet volume and density, the time interval during continuous recording, and the heat fixing condition with one common sensor,
It is possible to reduce the cost, simplify the control system including detection of the remaining amount, prevent the original ink bleeding and transfer, and make the dot density proper,
A high quality image can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of an embodiment of the present invention.

FIG. 2 is a block diagram of an inkjet recording apparatus to which the basic configuration in FIG. 1 is applied.

FIG. 3 is a block diagram in which the basic configuration shown in FIG. 1 is applied to an inkjet recording apparatus having a line head.

FIG. 4 is a block diagram in which the basic configuration shown in FIG. 1 is applied to an inkjet recording apparatus having a curl correcting unit.

FIG. 5 is a side view of a roll paper in which roll paper information and a start mark are recorded on the side surface of the roll paper.

6 is a vertical cross-sectional view taken along the line AA of FIG.

FIG. 7 is a side view of a roll paper in which roll paper information and a start mark are recorded on the side surface of a core material.

8 is a vertical cross-sectional view taken along the line BB of FIG.

FIG. 9 is a partial enlarged view showing a nozzle portion of the recording head.

FIG. 10 is a partial enlarged view showing a nozzle portion of a recording head having a plurality of heads.

[Explanation of symbols]

1 ... Core material 2 ... roll paper 3 ... axis 4 ... Bearing member 5 ... Conveyor roller 6 ... driven roller 7 ... Recording head 8 ... Guide bar 9 ... Cutter 10 ... Heating roller 11 ... Crimping roller 12 ... tray 13 ... Product 14 ... Conveyor motor 15 ... Start mark 16 ... Roll paper information 17 ... Sensor 18 ... Recording medium remaining amount calculation unit 19 ... Control unit 20 ... Display means 21 ... Recording medium remaining amount warning means 22 ... Error notification means 23 ... Motor driver 24 ... Image data input section 25 ... Color gradation converter 26 ... Error diffusion processing unit 27 ... Head driver 28 ... Motor driver 29 ... Motor 30 ... Belt 31 ... Pressure control unit 32 ... Temperature control unit 33 ... Motor driver 34 ... Motor 35 ... Eccentric cam 36 ... Spring 37 ... Laura 38 ... Laura 39 ... Belt 40 ... Belt 41 ... Laura 42 ... Belt 43 ... Nozzle

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65H 29/70 B41J 3/04 101Z 3F104 F term (reference) 2C056 EB13 EB29 2C058 AB12 AC07 AC12 AD01 AE04 AF06 AF15 AF31 AF54 GB04 GB20 GB30 GB33 GB48 GB53 GE03 2C060 BA01 BA10 BC94 BC96 CB12 2C061 AQ05 AS06 LL04 3F053 HA03 HA08 HB09 LA07 LB03 3F104 AA01 BA11

Claims (14)

[Claims] 1. A roll-shaped recording medium is conveyed by a conveying means, recording medium information previously recorded on the side surface of the recording medium or a core material is read by a sensor, and ink is ejected from an ink jet head with reference to this information. In an inkjet recording apparatus for recording on a recording medium, when the recording medium information is read by the sensor, the rotation amount or rotation speed of the roll-shaped recording medium is detected, and the rotation amount or rotation speed and the conveyance amount of the recording medium or An inkjet recording apparatus, characterized in that the remaining amount of a recording medium is calculated from the transport speed. 2. A roll-shaped recording medium is conveyed by a conveying means, recording medium information recorded in advance on a side surface of the recording medium or a core material is read by a sensor, and ink is ejected from an ink jet head with reference to this information. In the inkjet recording apparatus for recording on a recording medium, the recording medium information includes the outer diameter of the core material of the recording medium and the thickness of the recording medium, and when the recording medium information is read by the sensor, the roll-shaped recording medium The rotation amount or rotation speed of the recording medium is detected, and the remaining amount of the recording medium is calculated from the rotation amount or rotation speed, the conveyance amount or conveyance speed of the recording medium, the outer diameter of the core material of the recording medium, and the thickness of the recording medium. An ink jet recording apparatus characterized by the above. 3. A roll-shaped recording medium is conveyed by a conveying means, recording medium information recorded in advance on a side surface of the recording medium or a core material is read by a sensor, and ink is ejected from an ink jet head with reference to this information. In the ink jet recording apparatus for recording on the recording medium, when the recording medium information is read by the sensor, the rotation amount or the rotation speed of the roll-shaped recording medium is detected, and the rotation amount or the rotation speed and the conveyance amount of the recording medium are detected. Alternatively, the remaining amount of the recording medium is calculated from the conveyance speed, the calculated remaining amount of the recording medium is compared with the length of the image to be recorded in the recording medium conveying direction, and the remaining length of the recording medium should be recorded. An ink jet recording apparatus characterized by notifying an error and not starting recording when the length of the image is smaller than the sum of the length of the image in the recording medium conveyance direction and the length of a margin required before and after the image. Place 4. A roll-shaped recording medium is conveyed by a conveying means, recording medium information recorded in advance on a side surface or a core material of the recording medium is read by a sensor, and ink is ejected from an ink jet head with reference to this information. In the inkjet recording apparatus for recording on a recording medium, the recording medium information includes the outer diameter of the core material of the recording medium and the thickness of the recording medium, and when the recording medium information is read by the sensor, the roll-shaped recording medium The rotation amount or rotation speed of the recording medium is detected, and the remaining amount of the recording medium is calculated from the rotation amount or rotation speed, the conveyance amount or conveyance speed of the recording medium, the outer diameter of the core material of the recording medium, and the thickness of the recording medium. , The calculated remaining amount of the recording medium is compared with the length of the image to be recorded in the recording medium conveying direction, and the remaining length of the recording medium is required before and after the image in the recording medium conveying direction of the image to be recorded. An ink jet recording apparatus, which notifies an error and does not start recording when it is smaller than the sum of the lengths of the margins. 5. A roll-shaped recording medium is conveyed by a conveying means, recording medium information previously recorded on a side surface of the recording medium or a core material is read by a sensor, and ink is ejected from an inkjet head with reference to this information. In the ink jet recording apparatus for recording on the recording medium, when the recording medium information is read by the sensor, the rotation amount or the rotation speed of the roll-shaped recording medium is detected, and the rotation amount or the rotation speed and the conveyance amount of the recording medium are detected. Alternatively, the ink jet recording apparatus is characterized in that the roll outer diameter of the recording medium is estimated from the transport speed and the curl correcting means is operated according to the roll outer diameter. 6. The ink jet recording apparatus according to claim 1, further comprising a display unit that displays the remaining amount of the recording medium. 7. The ink jet recording apparatus according to claim 1, wherein an alarm is issued when the remaining amount of the recording medium falls below a predetermined value. 8. The recording medium information includes information on the type of recording medium or ink absorption capacity of the recording medium, and based on the information, the ink ejection amount per unit area for predetermined input data is controlled. The inkjet recording apparatus according to any one of claims 1 to 7. 9. The recording medium information includes information on a recording medium type or an ink absorption speed of the recording medium, and the ink ejection amount per unit time for predetermined input data is controlled based on the information. The inkjet recording apparatus according to any one of claims 1 to 7. 10. The ink jet recording apparatus according to claim 1, wherein the recording medium information includes information regarding a type of recording medium or a compatible recording condition, and the recording condition is controlled based on the information. Recording device. 11. The recording medium information includes information on the type of recording medium or the diameter of dots to be recorded, and the ink droplet volume and density are controlled based on the information. The ink jet recording apparatus according to any one of claims. 12. The recording medium information includes information relating to the type of recording medium or the color development of ink, and the color or gradation of an image to be recorded is controlled based on the information. The ink jet recording apparatus according to any one of claims. 13. The recording medium information includes information on a type of recording medium or a drying time of ink recorded on the recording medium, and a time interval during continuous recording is controlled based on the information. Item 8. The inkjet recording device according to any one of items 1 to 7. 14. The recording medium information includes information on the type of recording medium or heat fixing conditions of the recording medium, and the heat fixing conditions are controlled based on the information. The inkjet recording device according to item 1.