JPH0952397A - Ink jet recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of the jamming of recording paper, which is caused by the recorded paper rolled up due to moisture of ink, and perform printing at suitable feed speed based on the characteristic of the recording paper without the need for any special devices. SOLUTION: A main control unit 11 in a recording control section 1 gives instructions to a printer unit 2 so that printing data in an image memory 12 are printed at feed speed set to a feed mechanism 3. In this case, if a count value by a black dot counter unit 13 exceeds a predetermined value and when the generation of the jamming of printing paper is detected by a recording paper jamming detection unit 4, the main control unit 11 sets feed speed slower than that set up to that time to the feed mechanism 21 Further, if a count value by a number-of-sheet counter unit 14 for counting the number of recorded sheets exceeds a fixed value at the time when the count value by the black dot counter unit 13 exceeds the predetermined value, the main control unit 11 sets feed speed faster than that set up to that time to the feed mechanism 3.

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, and more particularly to an ink jet recording apparatus used in printers and facsimile machines and for ejecting ink onto recording paper to print data such as characters and image information.

[0002]

2. Description of the Related Art Conventionally, OA (Office Automation)
In a printer unit of a device or a recording unit of a facsimile machine, minute ink droplets are ejected from nozzles and the minute ink droplets are ejected toward a predetermined position on the recording paper, so that characters, image information, etc. are recorded on the recording paper. Data is being printed.

When high-speed printing is performed on a recording paper in the above-mentioned ink jet recording apparatus, if the black pixel ratio of data is high, a large amount of ink will adhere to the recording paper, and before the ink dries and is fixed. When conveyed, the recording paper may be soiled with the ink that has not dried.

In order to prevent the recording paper from being soiled, the temperature around the apparatus is detected by using a sensor, the black pixel ratio is calculated from the recording information, and the ink naturalness is calculated based on these conditions. There is a method of calculating a transport speed which is a drying condition and transporting at that transport speed.

In this method, in addition to changing the transport speed to dry the ink, intermittent recording (recording only the contour) is performed based on the calculated drying conditions to thin out black pixels, and a fixing lamp is used. The ink is forced to dry.

Further, since the drying time of ink varies depending on the type of recording paper, a code indicating the type of recording paper is attached to the recording paper cassette, and the code read from the recording paper cassette is used according to the type of recording paper. Weighting is performed when calculating the transport speed by calculating the optimum transport speed for each type of recording paper. Regarding the above method, see Japanese Patent Laid-Open No.
This is described in detail in Japanese Patent No. 338136.

[0007]

In the conventional ink jet recording apparatus described above, the conveyance speed is calculated based on the temperature around the apparatus and the black pixel ratio of the recording information, and the ink is naturally dried by conveying at that conveyance speed. This prevents the recording paper from becoming dirty due to undried ink.

In addition to the transport speed, intermittent recording is performed on the basis of the calculated drying conditions to thin out black pixels,
By forcibly drying the ink by using a fixing lamp, the stain on the recording paper due to the non-drying of the ink is prevented.

Therefore, when the recording paper rolls due to the wetness of the ink when the black pixel ratio is high, and the prevention of the recording paper jam generated by the roll is considered, the roll due to the wetness of the ink causes the characteristics of the recording paper to be used. The influence is great, and it is not sufficient to consider only the temperature around the apparatus and the black pixel rate of the recording information as the conditions for calculating the transport speed.

For example, when a recording paper which is easily rolled when the black pixel ratio is high is operated by calculating an appropriate transport speed from the temperature around the apparatus and the black pixel ratio, the black pixel ratio is actually used. If you use a recording paper that is difficult to roll even if it is high, even if it is possible to suppress the occurrence of recording paper jam even if it is transported at a transport speed faster than the calculated transport speed,
Since the recording paper is conveyed at the calculated conveyance speed, the performance of the apparatus cannot be fully brought out.

On the other hand, when recording paper having a high black pixel ratio and difficult to roll is operated by calculating an appropriate transport speed from the temperature around the apparatus and the black pixel ratio, the black pixel is actually operated. If you use recording paper that rolls easily when the rate is high, the recording paper is conveyed at the calculated conveyance speed even though the calculated conveyance speed is too fast to prevent the occurrence of recording paper jams. The recording paper jam is likely to occur.

Further, a code indicating the type of recording paper is attached to the recording paper cassette, and weighting is performed when calculating the conveying speed in consideration of the characteristics of the recording paper from the type of recording paper indicated by the code read from the recording paper cassette. However, this method requires a code reading device or the like for reading a code indicating the type of the recording paper, which increases the cost of the device.

Therefore, the object of the present invention is to solve the above-mentioned problems and to prevent the occurrence of recording paper jam due to the roll of recording paper due to the wetting of ink, without requiring a special device. An object of the present invention is to realize an inkjet recording apparatus that can perform printing at an appropriate transport speed that includes the characteristics of recording paper.

[0014]

An ink jet recording apparatus according to the present invention is an ink jet recording apparatus for printing data by ejecting ink onto a recording paper, and a black dot counting means for counting the number of black dots of the data. And a detection means for detecting the occurrence of a jam of the recording paper on which the data is printed, and the number of recording papers on which the data of which the count value of the black dot counting means is equal to or more than a predetermined value is printed is counted. The present invention further comprises a sheet number counting means, and a control means for controlling the conveying speed of the recording paper based on the count value of the black dot counting means, the detection result of the detecting means and the count value of the sheet number counting means.

Another ink jet recording apparatus according to the present invention is an ink jet recording apparatus that prints data by ejecting ink onto a recording paper, and a black pixel ratio calculating means for calculating a black pixel ratio of the data, A detection means for detecting the occurrence of a jam of the recording paper on which the data of which the calculation result of the black pixel ratio calculation means is equal to or more than a preset predetermined value is detected;
A sheet number counting means for counting the number of recording sheets on which the data is printed, a recording result of the recording sheet based on the calculation result of the black pixel rate calculating means, the detection result of the detecting means and the count value of the sheet counting means. And a control means for controlling the transport speed.

[0016]

First, the operation of the present invention will be described below.

When the counted number of black dots or the calculated black pixel ratio is equal to or greater than a predetermined value and the recording paper jam detector detects the recording paper jam, the main control unit controls the conveyance speed of the recording paper to be slowed. As a result, it is possible to avoid the occurrence of recording paper jam due to the wetness of ink in the recording operation after the occurrence of recording paper jam.

Further, when it is detected from the count value of the sheet counter section that the number of black dots counted or the calculated black pixel rate is equal to or more than a predetermined value and a certain number of sheets have been recorded, the conveyance speed of the recording paper is controlled by the main control section. Speed up. by this,
High-speed printing according to actual performance is possible.

Therefore, it is possible to prevent the occurrence of recording paper jam caused by the roll of recording paper due to the wetness of the ink, and to print at an appropriate conveying speed including the characteristics of the recording paper without requiring a special device. can do.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the figure, an ink jet recording apparatus according to an embodiment of the present invention includes a recording control unit 1, a printer unit 2, a recording paper conveyance mechanism 3 (not shown), and a recording paper jam detection unit 4.

The recording control unit 1 includes a main control unit 11, an image memory 12 for accumulating recording information to be recorded on recording paper, and a black dot for counting the number of black dots of the recording information sent from the image memory 12 to the printer unit 2. The counter unit 13 includes a counter unit 14, a number counter unit 14 for counting the number of recording sheets printed by the printer unit 2, and a ROM (Read Only Memory) 15 for storing programs executed by the main control unit 11. There is.

In the main control unit 11, the count value of the black dot counter unit 13, that is, from the image memory 12 to the printer unit 2
When the number of black dots of the recording information sent to the recording medium exceeds a predetermined value set in advance, based on the detection result of the recording paper jam detecting unit 4 and the count value of the number of sheets counter unit 14, the transport mechanism 3
Controls the conveyance speed of the recording paper.

That is, when the count value of the black dot counter section 13 of the main control section 11 becomes a predetermined value or more and the occurrence of the recording sheet jam is detected by the recording sheet jam detecting section 4, the conveyance mechanism 3 detects that the recording sheet jams. The printer unit 2 is instructed to reduce the transport speed.

Further, when the count value of the black dot counter section 13 becomes a predetermined value or more and the count value of the number counter section 14 becomes a predetermined value or more, the main control section 11 detects that the recording paper by the transport mechanism 3 is printed. The printer unit 2 is instructed to increase the transport speed.

FIG. 2 is a flow chart showing the processing operation of an embodiment of the present invention. The control of the conveyance speed of the recording paper according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2.

When the ink jet recording apparatus is powered on, the main control section 11 of the recording control section 1 monitors whether or not the record information to be recorded on the recording sheet has been input to the image memory 12 (step S1 in FIG. 2). ).

The main controller 11 stores the recorded information in the image memory 12
Is input to the transport mechanism 3 via the printer unit 2, an initial value is set as the transport speed (x) (step S2 in FIG. 2). Here, as an initial value set as the transport speed (x) in the transport mechanism 3, a transport speed at which the recording paper jam does not occur even if the black pixel ratio is higher than a predetermined value with respect to the reference recording paper is determined in advance. The transport speed is stored in the ROM 15 in advance.

Subsequently, the main control unit 11 controls the number counter unit 1
The count value (y) of 4 is cleared to 0 (step S in FIG. 2).
3), it is checked whether or not the print data exists in the image memory 12 (step S4 in FIG. 2). If the print data exists in the image memory 12, the printer unit 2 stores the image data in the image memory 12 at the conveyance speed set in the conveyance mechanism 3. It is instructed to print the print data (step S5 in FIG. 2).

At this time, the main control unit 11 determines whether or not the number of black dots in the print data counted by the black dot counter unit 13 has exceeded a predetermined value (step S in FIG. 2).
6). When the main control unit 11 determines that the count value of the black dot counter unit 13 has not reached the predetermined value or more, if the print data is in the image memory 12, the print data is transferred to the printer unit 2 at the transport speed set in the transport mechanism 3. Is instructed to be printed (steps S4 and S5 in FIG. 2).

On the other hand, when the count value of the black dot counter section 13 exceeds a predetermined value, the main control section 11 increments the count value of the number counter section 14 (step S7 in FIG. 2), and the recording paper jam detection section 4 detects it. Based on the result, it is determined whether a recording paper jam has occurred (step S8 in FIG. 2).
Here, the recording paper jam detection unit 4 is composed of, for example, a sensor or the like, and if a detection signal is continuously output from the same sensor for a predetermined time, it is determined as a recording paper jam.

When the main controller 11 determines that the recording paper jam does not occur, it determines whether or not the count value of the number counter 14 exceeds a certain value (step S in FIG. 2).
9). If the main control unit 11 determines that the count value of the number counter unit 14 has not reached a certain value or more, if the print data is in the image memory 12, the print data is sent to the printer unit 2 at the carrying speed set in the carrying mechanism 3. Instruct to print (steps S4 and S5 in FIG. 2).

When the main controller 11 determines that the count value of the number counter 14 has exceeded a certain value, it instructs the transport speed (x) to be faster than that (step S10 in FIG. 2). That is, the main control unit 11 sets the transport mechanism 3 via the printer unit 2 to a transport speed (x) faster than before.

After that, the main control unit 11 clears the count value (y) of the number counter unit 14 to 0 (step S in FIG. 2).
3) Print the print data of the image memory 12 at the transport speed set in the transport mechanism 3 in the printer unit 2 (speed faster than the transport speed up to then) while checking whether the print data is in the image memory 12 or not. (Steps S4 and S5 in FIG. 2).

When the main controller 11 determines that a recording paper jam has occurred, it instructs the transport speed (x) to be slower than that (step S11 in FIG. 2). That is, the main control unit 11 sets the transport mechanism 3 via the printer unit 2 to a transport speed (x) slower than before.

After that, the main controller 11 clears the count value (y) of the number counter 14 to 0 (step S in FIG. 2).
3) Print the print data of the image memory 12 at the transport speed set in the transport mechanism 3 in the printer unit 2 (speed faster than the transport speed up to then) while checking whether the print data is in the image memory 12 or not. (Steps S4 and S5 in FIG. 2).

When there is no print data in the image memory 12, the main control unit 11 determines whether the process is completed (step S12 in FIG. 2). If the process is completed, the control of the recording paper conveyance speed is completed. If the main control unit 11 has not completed the processing,
The process returns to step S1 and waits until the next print data is input.

As described above, when the recording paper jam detection unit 4 detects the occurrence of the recording paper jam when the number of black dots exceeds a predetermined value, the main control unit 11 causes the recording paper jam to wet the ink. Therefore, the conveyance speed (x) is slowed in the recording operation after the occurrence of the recording paper jam to avoid the occurrence of the recording paper jam due to the wetness of the ink.

Further, the main control section 11 counts the number of printed sheets when the number of black dots exceeds a predetermined value by the sheet number counter section 14, and if a recording sheet jam does not occur even if a certain number of sheets are printed, the sheet is conveyed. The speed (x) is increased to enable high-speed printing that matches actual performance.

In the above description, the black dot number of the print data stored in the image memory 12 is counted by the black dot number counter unit 13, but the black dot number counter unit 13 is used.
In place of the above, a circuit for counting the number of black dots and white dots in the print data, counting only the number of black dots, and calculating the black pixel ratio from these count values is provided, and the control speed of the recording paper is controlled by the main control unit. It is also possible to perform it based on the black pixel ratio.

As described above, when the counted number of black dots or the calculated black pixel ratio is equal to or larger than the predetermined value and the recording paper jam detecting unit 4 detects the recording paper jam, the main control unit 11 controls the transport mechanism 3 to control the recording paper jam. By slowing the conveyance speed (x) of the recording paper, it is possible to avoid the occurrence of the recording paper jam due to the wetness of the ink in the recording operation after the occurrence of the recording paper jam.

Further, when it is detected from the count value of the number counter section 14 that the number of counted black dots or the calculated black pixel rate is equal to or more than a predetermined value and a predetermined number of sheets are recorded, the transport mechanism 3 is controlled by the main control section 11. By increasing the conveyance speed (x) of the recording paper according to, it is possible to perform high-speed printing according to the actual capability.

Therefore, it is possible to prevent the recording paper jam caused by the roll of the recording paper due to the wetness of the ink, and to print at an appropriate transport speed including the characteristics of the recording paper without requiring a special device. can do.

[0043]

As described above, according to the present invention, the count value of the number of black dots or the black pixel ratio of data, the detection result of the occurrence of the jam of the recording paper on which the data is printed, and the black dot of the data The roll of recording paper due to ink wetness is controlled by controlling the conveying speed of the recording paper based on the count value or the count value of the number of recording papers on which the data with the black pixel ratio is a preset value or more. There is an effect that it is possible to prevent the occurrence of a recording paper jam as a cause, and it is possible to perform printing at an appropriate transport speed including the characteristics of the recording paper without requiring a special device.

[Brief description of drawings]

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

FIG. 2 is a flowchart illustrating a processing operation according to an embodiment of the present invention.

[Explanation of symbols]

 1 Recording Control Section 2 Printer Section 3 Conveying Mechanism 4 Recording Paper Jam Detection Section 11 Main Control Section 12 Image Memory 13 Black Dot Counter Section 14 Number of Sheets Counter Section

Claims (6)

[Claims] 1. An inkjet recording device for printing data by ejecting ink onto recording paper, comprising: black dot counting means for counting the number of black dots in the data; and jam of the recording paper on which the data is printed. Detecting means for detecting the occurrence of the number of recording sheets, a counting means for counting the number of recording papers printed with data whose count value of the black dot counting means is equal to or more than a preset predetermined value, and a total of the black dot counting means. An ink jet recording apparatus comprising: a control unit that controls a conveying speed of the recording sheet based on a numerical value, a detection result of the detection unit, and a count value of the sheet number counting unit. 2. The control means slows down the conveying speed of the recording paper when the count value of the black dot counting means is equal to or larger than the predetermined value and the occurrence of jam of the recording paper is detected by the detecting means. It is constituted as follows, Claim 1 characterized by the above-mentioned.
The inkjet recording apparatus according to any one of the preceding claims. 3. The control means speeds up the conveyance speed of the recording paper when the count value of the black dot counting means is equal to or more than the predetermined value and the count value of the number-of-sheets counting means is equal to or more than a preset constant value. The inkjet recording apparatus according to claim 1 or 2, wherein the inkjet recording apparatus is configured to: 4. An inkjet recording apparatus for printing data by ejecting ink onto recording paper, comprising: a black pixel ratio calculating means for calculating a black pixel ratio of the data; and a recording paper on which the data is printed. Detecting means for detecting the occurrence of a jam, counting means for counting the number of recording papers on which the calculation result of the black pixel ratio calculating means is equal to or more than a preset predetermined value, and the black pixel ratio calculating An ink jet recording apparatus comprising: a control unit that controls a conveying speed of the recording sheet based on a calculation result of the recording unit, a detection result of the detecting unit, and a count value of the number-of-sheets counting unit. 5. The control unit slows down the conveyance speed of the recording paper when the calculation result of the black pixel ratio calculation unit is equal to or more than the predetermined value and the detection unit detects the occurrence of a jam of the recording paper. The inkjet recording apparatus according to claim 4, wherein the inkjet recording apparatus is configured to: 6. The control unit controls the conveyance speed of the recording paper when the calculation result of the black pixel ratio calculation unit is equal to or more than the predetermined value and the count value of the number counting unit is equal to or more than a preset constant value. The inkjet recording apparatus according to claim 4 or 5, wherein the inkjet recording apparatus is configured to be faster.