JPH08310689A - Recording device - Google Patents

Abstract

PURPOSE: To manufacture a recording device capable of correcting the meandering without any detector in the shipping condition from a factory, and without any temporal errors during the recording at a low cost in the recording device where the multiple color recording is achieved using the ink or ink sheet of N kinds of color on a recording paper. CONSTITUTION: Assuming that a meandering amount and direction specific to a recording device are changed in the prescribed direction at the prescribed rate in mono-color unit, the meandering amount and direction are measured in the mono-color unit using a detector 7, and then, a detector 7 is removed. The measured data are stored in a storage device 3 as the data. A meandering correction calculating means 4 calculates the meandering correction from the stored data. The record of one color is constituted by A line, and in the case where correction is made with the unit of n-lines, the meandering amount calculating means 4 calculates the value given by the formula of (meandering amount)/A*n as the meandering correction amount. A meandering correction system 5 achieves the meandering correction according to the meandering correction amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage device, and more particularly to a recording device provided with a skew feeding correction system for correcting a printing shift (color shift) due to a skew of a recording sheet.

[0002]

2. Description of the Related Art In a conventional recording apparatus, as a method of correcting a recording deviation due to a skew of the recording paper, a movement of the recording paper itself is mainly monitored by a sensor, a camera or the like to determine the skew amount of the recording paper. Measures are the mainstream, and the technology is still being used in products. Such a conventional detection method and correction method are disclosed in, for example, Japanese Patent Laid-Open No. 64-25163. FIG. 5 is a diagram showing a configuration of an electrostatic plotter having a skew feeding amount detection / correction function disclosed in the above-mentioned conventional technique.

The operation of FIG. 5 will be described below. Figure 5
As shown in, the plot paper 9P continuous in the longitudinal direction
Is sent in the arrow direction 16P by the drive roller 10 which rotates by receiving power from a drive mechanism driven by a step motor (not shown). At that time, plot paper 9
To plot a pattern on P, plot paper 9
When P passes through the recording head 12, a voltage is also applied to the recording needle of the recording head 12 designated by the signal based on the artwork data. As a result, an electrostatic latent image is formed on the designated portion of the plot paper 9P, and the developing unit 11
At, the toner adheres to the electrostatic latent image portion of the plot paper 9P, whereby the electrostatic latent image becomes a visible image, and the plot is completed.

Further, as shown in FIG. 5, the recording head 12
A back electrode 13 for pressing the plotting paper 9P against the recording needles of the recording head 12 with a predetermined pressure is provided on the upper part of the position of the plotting paper 9P. A drive controller 15 is provided which receives the signal 17 and drives the step mode described above.

FIG. 6 is a top perspective view of the plot sheet 9P of FIG. As shown in FIG. 6, on both sides of the upper surface of the plot paper 9P, there are position detection marks 18 in which black and white are alternately recorded at predetermined intervals along the longitudinal direction thereof. Figure 5
The position detector 14 reads the position detection mark 16 on the plot paper 9P and outputs the position detection signal 17 corresponding to the black position detection mark 18. The drive control unit 15 differentiates the position detection signal 17 to generate pulses at the rising and falling edges of black, and counts the time of both pulses with a predetermined clock (not shown). Then, the drive control unit 15
The drive pulse 19 to the step motor (FIG. 5) is increased / decreased to control the rotation speed of the step motor so that the count value matches a preset reference value, thereby increasing / decreasing the rotation of the drive roller 10. Then, the feed amount of the plot paper 9P is corrected.

[0006]

In the conventional recording apparatus as described above, the skew amount and the skew direction of the recording sheet are detected while the pattern is being recorded on the recording sheet (eg sheet 9).
If the widths d in the longitudinal direction of the position detection marks on both sides of P are the same and the count value on the right side is the same as the count value on the left side, at least the skew can be judged to be substantially zero. . ), Calculate the skew feed correction amount from the detected amount,
It was corrected.

However, in such a conventional correction method,
Since the time required from the detection of the skew amount and the skew direction to the completion of the correction, that is, the feed time of the width d of the position detection mark in FIG. 6 occurs, the control of the correction related to the skew is delayed. Due to the fact that skew feeding cannot be corrected in real time, a slight time error occurred in the correction.

As the position detector 14 in the electrostatic plotter of FIG. 5, an expensive device such as a CCD camera is often used as a device for detecting the skew amount and the skew direction. As a result, the cost is high, which has been an obstacle to the inexpensive manufacture of the recording apparatus.

Further, in a multicolor recording apparatus for recording multicolors of N colors by using N colors (N is a positive number) of ink or ink sheet on the recording paper, recording is performed in a direction indicated by an arrow 16P in FIG. Recording of one color is completed each time the paper is sub-scanned, and the recording paper is returned in the reverse sub-scanning direction before the recording of the next color is started.
In addition, it is customary to overwrite and record the next color from the original position. However, in this case, the amount of skew may differ when recording each of the N colors, so when performing the same amount of correction for each color as in the prior art, it is possible to record each color at the same point on the recording paper. Not possible, and as a result,
It was a cause of color shift.

The present invention has been made in order to solve such a matter of concern, and when recording on a recording sheet, skew feeding correction is performed without causing a time error and without causing color misregistration. The purpose is to realize an inexpensive recording device that can be performed.

[0011]

According to a first aspect of the present invention, an N (N is a positive number) color ink or ink sheet is used as a recording paper, and the recording paper is sub-scanned N times to form an arbitrary image. In a recording device for recording, assuming that the skew amount and the skew direction specific to the recording device change in a fixed direction in a fixed amount within a single color unit, the measurement is performed in advance in the single color unit using a detector. A storage device that stores the skew amount and the skew direction as data, skew correction amount calculation means that calculates a skew correction amount from the data, and skew that performs skew correction according to the skew correction amount. And a line correction system.

According to a second aspect of the present invention, in the recording apparatus according to the first aspect, the recording for one color is made up of A (A is a positive number) lines, and the correction is performed in units of a predetermined number of lines. In this case, the skew feeding correction amount calculation means
A value obtained by dividing the data for one color for the skew amount by the A and multiplying the predetermined number of lines is calculated as the skew correction amount for the skew amount.

According to a third aspect of the present invention, in the recording apparatus according to the first aspect, the skew amount and the skew direction specific to the recording apparatus instead of the storage apparatus are X line units (X is a positive number). Assuming that it changes in a certain direction in a certain amount,
A storage device is newly provided to store the skew amount and the skew direction measured in advance by the X line unit using a detector as data.

According to a fourth aspect of the present invention, in the recording apparatus according to the third aspect, when the correction is performed by using a predetermined number of lines as a unit, the skew feed correction amount calculation means outputs the data relating to the skew feed amount as the X value. A value obtained by multiplying the value obtained by dividing by the predetermined number of lines is calculated as the skew correction amount for the skew amount.

According to a fifth aspect of the present invention, there is provided a recording apparatus which uses N (N is a positive number) color ink or ink sheet as a recording paper and records an arbitrary image by sub-scanning the recording paper N times. Assuming that the skew amount and skew direction peculiar to the recording apparatus change in a constant direction in one color unit by a constant amount, the skew amount and the skew correction amount for correcting the skew direction,
A storage device that stores in advance the data in units of one color,
And a skew feeding correction system for performing skew feeding correction according to the skew feeding correction amount.

According to a sixth aspect of the present invention, in the recording apparatus according to the fifth aspect, the skew amount and the skew direction are X lines (X is a positive number) in place of the storage device unique to the recording device. Assuming that the unit changes in a certain direction in a certain amount, the skew amount and the skew correction amount for correcting the skew direction are defined as follows.
A storage device for previously storing data in units of X lines is newly provided.

[0017]

In the recording apparatus according to the first aspect of the present invention, in order to recognize the skew amount and the skew direction peculiar to the recording apparatus, the detector is used in advance for each color unit (one sub-scanning unit). To measure. That is, every time the recording of one color is completed, the skew amount and the skew direction data accumulated at the time of recording are measured once. After measuring the amount of skew and the data in the skew direction relating to all the required N colors, the detector is removed. The measurement data unique to the storage device regarding the skew amount and the skew direction thus obtained is stored for each storage device.

The above data is read before the recording apparatus starts recording of each color, and the skew feed correction amount is calculated by the skew feed correction amount calculation means based on the read data, and the calculated data is skewed. Control the correction system.

This skew correction control is based on the theory that skew due to mechanical factors occurs in a fixed direction and at a fixed amount for a fixed time.

According to another aspect of the recording apparatus of the present invention, recording for one color (that is, one page) is made up of A lines (A is a positive number), and based on the skew amount and the skew direction data for one color. Correction is performed in units of a predetermined line. Regarding the correction of the skew amount in units of a predetermined line, when the total skew amount of the first color in the storage device is SP1, the skew amount given by SP1 / A * (predetermined number of lines), that is, the entire one color In the above, the skew amount obtained by multiplying the average skew amount per line by a predetermined number of lines may be corrected in a predetermined line unit. The skew correction amount at that time is calculated by the skew correction amount calculation means. When the skew amount of the second color is SP2, S
The skew amount given by P2 / A * (predetermined number of lines) is corrected. That is, the correction of the uniform skew amount is performed in a predetermined line unit on the basis of the data of the average skew amount over one page.

In the recording apparatus according to the third aspect of the present invention, in order to recognize the skew amount and the skew direction unique to the recording apparatus,
Using a detector, measure them in X-line units (X is a positive number). That is, every time recording of X lines is completed, the skewed portion accumulated at the time of recording is measured once. After the measurement, the above detector is removed. The skew amount and the measurement data in the skew direction thus obtained are stored in the storage device, and this data is read and corrected each time the recording device records X lines.

According to the recording apparatus of claim 4, recording of one color (that is, one page) is composed of A lines (A is a positive number),
Further, the correction is performed in units of a predetermined X line. Here, the skew amount for the first X line of the first color in the storage device is SL1.
When set to 1, the skew amount per line given by SL11 / X * (predetermined number of lines) is corrected in a predetermined line unit. If the skew amount for the next X lines is SL12, the skew amount given by SL12 / X * (predetermined number of lines) is corrected in predetermined line units. In this way, the skew amount for each color, that is, for one page is called from the storage device A / X times, and the correction amount at that time is calculated by the skew correction amount calculation means. Similarly, in the case of recording the second color, those skew amounts are set to SL21, SL22. ． In this case, the skew feeding amount is called in this order, and the skew feeding correction amount is calculated and corrected.

In the recording apparatus according to the fifth aspect of the present invention, unlike the first aspect, there is no equivalent to the skew feeding correction amount calculating means, and the data recorded in the storage device is not the skew feeding amount but 1 It is a correction amount corresponding to each color unit. For example, when correcting the first color in units of a predetermined line, a correction amount corresponding to the skew amount given by the above SP1 / A * (predetermined number of lines) is stored in the storage device.

The recording apparatus according to claim 6 of the present invention also includes the recording apparatus according to claim 1.
There is no equivalent to the skew feed correction amount calculation means in the above, and the data in the storage device here is not the skew feed amount, but the correction amount corresponding thereto. Moreover, the correction amount is 1 of claim 5.
Instead of the correction amount in color units (= 1 page unit), the correction amount is for X lines in the first color. Therefore, in the case of correcting in a predetermined line unit, the above S
A correction amount according to the skew feed amount of L11 / X * (a predetermined number of lines) is stored in the storage device.

[0025]

EXAMPLES Before describing specific examples, the outline of the examples will be described below.

Generally, in a recording apparatus, the drive roller 10 in the electrostatic plotter in FIG. 5 and the twist of the shaft such as a platen roller for sandwiching the recording paper with the thermal head in the thermal transfer recording apparatus and the rubber of the platen roller are used. Mainly due to mechanical factors such as deflection, the recording paper is skewed (SL11, SL12, SL13, SP shown in FIGS. 2 and 3 to be described later).
1) occurs, and most of the skew feeding amount is due to this mechanical skewing.

Regarding this mechanical skew, when performing monochrome recording, or when performing recording by performing a certain series of operations of the mechanical system of the recording apparatus, the skew for each recording is performed. It is known that the amount and the skew direction are almost the same each time.

Further, even in the case of performing multi-color printing, if the printing is performed by performing a certain series of operations of the mechanical system of the printing apparatus, the skew amount and the skew direction at the time of printing the first color Is about the same amount each time, and similarly, the skew amount and the skew direction for each of the second and third colors, which follow thereafter, are also about the same amount each time.

Against this background, in order to solve the above problems, N (N is a positive number) color ink or ink sheet is used for the recording paper, and N times of sub-scanning (see FIGS. 2 and 3) is performed. In the recording apparatus of the present invention for recording an arbitrary image in the sub-scanning direction), the skew amount and skew direction peculiar to the recording apparatus are in units of X lines (X is a positive number and corresponds to one color). , That is, a value smaller than the number A of lines for one page.), The skew amount detector detects the amount of change in X line units in units of X lines. The skew amount and the skew direction, which are unique to the, are measured, and the skew detector is removed after the measurement. Then, a storage device that stores the measured skew feeding amount and the skew feeding direction as data, and a skew feeding correction amount that is calculated from the data is used to perform correction with a predetermined number of lines (1 or more and less than X). A line correction amount calculation unit and a skew correction system that performs skew correction according to the skew correction amount are provided (corresponding to the first embodiment).

Further, in another N-color recording apparatus of the present invention, it is assumed that the skew amount and the skew direction, which are unique to the recording apparatus, change in a fixed direction in a fixed amount in one color unit. The amount of skew and the skew direction are measured for each color by the line amount detector, and after the measurement, the skew amount detector is removed. In addition, a storage device that stores the skew amount and the skew direction as data and a correction method using a predetermined number of lines (a number of 1 or more and less than the number A of lines of one color) are used. Skew correction amount calculating means for calculating the line correction amount,
And a skew feed correction system for performing skew feed correction according to the skew feed correction amount (corresponding to a modification of the first embodiment).

Further, in still another N-color recording apparatus of the present invention, it is assumed that the skew amount and the skew direction change in a certain direction in a certain direction within one color unit, and the skew amount detector. Thus, the skew amount and the skew direction are measured in one color unit (that is, one sub-scanning unit), and after the measurement, the skew amount detector is removed. The storage device stores the skew amount and the skew correction amount in the skew direction for each color, and the skew correction system that corrects the skew according to the skew correction amount (Example) 2). Also in this case, the skew feed correction amount changes depending on the number of lines to be corrected in actual image recording.

In still another recording apparatus of the present invention, X
Assuming that the skew amount and the skew direction change in a constant direction in a line unit, the skew amount detecting device detects X
The skew amount and skew direction are measured line by line, and the skew amount detection device is removed after the measurement. The storage device stores the skew amount and the skew correction amount in the skew direction in units of X lines, and the skew correction system that performs skew correction according to the skew correction amount (implementation). Corresponds to Example 2).

The details of each embodiment will be described below.

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram showing the configuration of a skew feeding correction circuit in an N-color recording apparatus (hereinafter simply referred to as a recording apparatus) of the present invention. In FIG. 1, reference numeral 1 denotes a CPU that manages the state of the recording apparatus and manages skew correction timing.
2 is an address generator that receives instruction data from the CPU 1 and generates address data of a storage device 3 described later,
3 is a storage device for storing the skew amount and skew direction data in a memory address based on the address data, and 4 is a skew correction amount based on the skew amount and skew direction data read from the storage device 3. A skew feed correction amount calculating means for calculating and outputting the calculated value as skew feed correction amount data is a skew feed correction system 5 for mechanically or electrically performing skew feed correction in accordance with the above-described skew feed correction amount data. 6 indicates a recording circuit for transferring the image data 8 to a recording head (not shown) and for controlling the recording time of the recording head. Reference numeral 7 is a skew amount and skew direction detector, which is removed after measuring the skew amount and skew direction data. Hereinafter, 7 will be simply referred to as a detector.

The operation of this skew feeding correction circuit will be described with reference to FIG. First, this recording apparatus records an arbitrary image without performing skew correction. At this time, the skew detector 7
The skew amount and the skew direction are detected with the detector 7
Is detected once every time the recording circuit 6 records X lines (X is a positive number). That is, the detector 7 sets the detection amount for the first X line of the first color recording as SL11, the detection amount for the next X line as SL12 ...
The detection amount for the line is set as SL21, the detection amount for the next X line is set as SL22, and so on, and the measured data are stored in the storage device 3.

Here, the oblique direction is the detection amount vector SL in the sub-scanning direction 16 as shown in FIG.
Is defined by relative angles (θ0, θ1, θ2, ...) Such as the angle θ0 of 11 and the angle θ1 of the detection amount vector SL12 with respect to the detection amount vector SL11. Detection amount vector SL11, S
It is defined by the lengths of L12, SL13, ....

After the detection of the skew amount and skew direction for each color and the data extraction processing (processing such as storing in a storage device) related thereto, the detector 7 is removed, and the detector 7 is removed. However, the recording device is shipped from the factory. In other words, the storage device 3 stores data relating to each unique skew amount and skew direction.

Next, the normal operation of the recording apparatus will be described. First, the CPU 1 receives a recording start command and outputs a signal instructing the address generation of the storage device 3 to the address generator 2.

Before the recording of the first X line of the first color is started, the address generator 2 detects the corresponding detection amount SL11.
Before the next X line is recorded, an address for reading the corresponding detection amount SL12 is generated. Corresponding to the address, the storage device 3 outputs the read detection amount to the skew feeding correction amount calculation means 4.
That is, for example, before performing the recording operation of the X line so that the correction can be performed in real time, the apparatus has the data corresponding to the X line in advance.

The skew feed correction amount calculation means 4 calculates numerical data which the skew feed correction system 5 can control immediately after receiving the data, from the inputted skew feed amount and skew feed direction data.
For example, in FIG. 2 described above, if correction is performed in units of one line (predetermined number of lines = 1), the control for the first X lines is performed with the skew direction θ0 and the length value of the detection amount vector SL11. It is realized by correcting one line in real time by a skew correction amount (SL11 / X) corresponding to the skew amount obtained by dividing by X and repeating this for each line X times. As a result, instead of performing the correction process with the conventional time lag, the skew feeding is corrected in real time with the correction value unique to each recording device.

Further, when recording for one color (one page) is composed of A lines and correction is performed in n (1 <n <X <A) line units (predetermined number of lines = n), (SL11 / X)
* The skew amount of n is corrected in units of n lines, and then (SL12
/ X) * n skew amount is corrected in units of n lines.

The skew feeding correction system 5 of FIG. 1 receives the skew feeding correction amount to perform the skew feeding correction. As the skew feeding correction system 5, the driving roller taken as a conventional example in the present invention (see FIG. 5) is used. 1
0) or the platen roller, the mechanical scanning may be performed mechanically by controlling in real time in accordance with the main scanning line for recording the rotational speed, or the amount of skew with respect to a predetermined line n unit, the X line or the A line. Since it is known in advance, the image data may be shifted in the image memory by an amount corresponding to the skew, and may be rearranged electrically.

As a result, the recording circuit 6 can print the image data for each color on the recording paper under the environment in which the skew feeding correction is performed in real time at the same time as recording each line, based on the correction data for each color. By such a series of flows,
This recording apparatus can print an arbitrary image (color image of multi-color printing as well as monochrome) under a stable environment where there is no color shift between the colors due to skew. That is, it can be recorded.

(Modification of First Embodiment) Next, a modification of the above-described first embodiment will be described. A block diagram of the skew feeding correction circuit is as shown in FIG.

Here, as shown in FIG.
, The skew direction and skew amount data for each color (θ0, S
P1) is stored. In FIG. 3, one-color recording is composed of A lines (A is a positive number), and the angle θ0 and the size of the vector SP1 are the skew direction and the skew amount when printing the A lines, respectively. Represents the skew direction θ0
And a value obtained by dividing the skew feed amount SP1 by the number of lines A (SP1 /
A) corresponds to the skew direction and the skew amount that should be corrected for each line.

Therefore, when the correction is performed on a line-by-line basis, the skew feed correction amount calculation means 4 uses the value (θ0, SP1 /
The skew correction amount corresponding to A) is calculated, and the skew correction system 5 receives the skew correction amount and corrects the skew, thereby correcting the skew direction and the skew amount for each line. .

The above is the case where the correction is made in the unit of one line, but instead, when the correction is made in the unit of n lines (1 <n <A), the skew direction θ0 and SP1 are divided by A. It is only necessary to calculate the skew feed correction amount, which is the skew feed amount (SP1 / A) * n obtained by multiplying the above value by n. Similarly, S
P2 is also corrected by the skew amount (SP2 / A) * n and θ1.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to FIG.

FIG. 4 is a block diagram of the skew feeding correction circuit in the recording apparatus of the present invention. The difference between FIG. 1 and FIG.
The presence or absence of the skew feed correction amount calculation means 4 exists. In this embodiment, the skew feed correction amount calculation means 4 is not provided. In FIG. 4, the storage device 3 stores a skew correction amount that the skew correction system 5 can directly use the numerical value. That is, the measurement data 19 regarding the skew direction and the skew amount detected by the detector 7 are transmitted to the CPU 1, and in the CPU 1,
The data 19 are converted in advance to an optimum skew correction amount according to the correction method (mechanical or electrical) of the skew correction system 5, and then the data 20 giving the skew correction amount is stored in the storage device 3. Stored in advance. At this time, when the skew amount is obtained by detection as in Example 1 (FIG. 2),
Alternatively, it may be either the case obtained by detection as in the modified example of the first embodiment (FIG. 3).

Other operations are the same as those in FIG. Here, when the change pattern of the skew amount due to the change over time is known in advance, the data in the storage device 3 may be corrected according to the change pattern. It goes without saying that this idea can be applied to the above-described embodiments and the like.

[0052]

As described above, according to the first aspect of the present invention.
According to the above, since the respective skew amount and skew direction of each recording device are known before actual image recording, skew correction is performed in real time without causing a time delay error. You can Further, unlike the conventional case, it is not necessary to always provide an expensive skew detector at the time of recording, so that there is an effect that the recording apparatus can be manufactured at low cost. In addition, since the amount of skew feeding is known for each color, and skew feeding correction can be performed for each recording color by using this, it is possible to reduce color misregistration at the time of overwriting at the same point even on the entire recording screen. . Especially when the screen to be recorded is relatively small, the correction of the skew feeding amount in units of one color is sufficient.

According to the second aspect of the invention, the skew amount corresponding to a predetermined number of lines is obtained from the entire skew amount of one color unit. As a result, an average skew correction can be performed every predetermined number of lines. Even if the screen to be recorded is a little large, it is possible to perform a uniform skew correction for each predetermined number of recording areas by average correction. The effect of reducing other color misregistration is the same as that of the first aspect.

According to claim 3 of the present invention, the effect thereof is basically the same as that of claims 1 and 2. However, since the skew amount is known in advance for a predetermined number of X lines, that is, in units of several lines, the skew amount may change for each X line in the sub-scanning direction for each color, as shown in FIG. Since it is possible to correct skew feeding that can reliably follow the change, skew feeding can be performed with higher accuracy than skew feeding correction that follows the recording color. As a result, the color shift at the time of overwriting on the same point is finely corrected at least for each predetermined line number (X line number) area. As a result, the color shift can be further reduced.

Further, in the invention of claim 4, the skew amount is corrected based on the skew amount for each predetermined line unit from the skew amount for each predetermined line unit. In this case, the skew amount is corrected for each line in a predetermined line number unit area. As a result, the skew correction can be performed more finely than the skew correction according to the third aspect, so that the color shift at the time of overwriting on the same point can be further reduced.

According to claim 5 of the present invention, the effect is basically the same as that of claims 1 and 2 above.
However, unlike the first, second, third and fourth claims, the skew feeding correction amount calculating means 4 is not required. Instead, the skew amount extracted from the previous detector and the data obtained by calculating the correction amount from the skew direction are stored in advance in the storage device, and no means for calculating the correction amount is required. Can be made smaller. In other words, the cost of the storage device can be reduced.

Further, according to claim 6 of the present invention, even if the skew feeding correction amount calculation means 4 is not provided, at least the same effect as in claim 3 is obtained with respect to color misregistration.
Data in which the correction amount is calculated from the skew amount in advance is stored in the storage device, and the circuit scale can be reduced, which is the same as the fifth aspect. Needless to say, the concept of claim 6 can be corrected so as to be skew-corrected for each line unit in the X line as in the case of claim 4.

[Brief description of drawings]

FIG. 1 is a block diagram showing a skew amount and skew direction correction circuit in a first embodiment of the present invention.

FIG. 2 is a simplified diagram illustrating a skew amount and a skew direction detection method according to an embodiment of the present invention.

FIG. 3 is a simplified diagram showing a skew amount and a skew direction detection method according to an embodiment of the present invention.

FIG. 4 is a block diagram showing a skew amount and skew direction correction circuit in a second embodiment of the present invention.

FIG. 5 is a structural diagram showing a conventional recording apparatus.

FIG. 6 is a top perspective view of plot paper in a conventional recording apparatus.

[Explanation of symbols]

1 CPU, 2 address generator, 3 storage device, 4
Skew correction amount calculation means, 5 skew correction system, 6 recording circuits,
7 skew amount and skew direction detector, 9 recording paper, 9P plot paper, 10 drive roller, 11 developing unit, 12
Recording head, 13 back electrode, 14 position detector, 1
5 Drive control section, 18 Position detection mark.

Claims (6)

[Claims] 1. A recording apparatus for recording an arbitrary image by using N (N is a positive number) color ink or ink sheet on the recording sheet and sub-scanning the recording sheet N times, which is unique to the recording apparatus. Assuming that the amount of skew and the direction of skew change in a certain direction in one color unit, the skew amount and the skew direction measured in advance in a unit of one color using a detector are used as data. A skew correction correction amount calculation unit that calculates a skew correction amount from the data, and a skew correction system that performs skew correction according to the skew correction amount. Recording device. 2. The recording apparatus according to claim 1, wherein the recording for one color is composed of A (A is a positive number) lines, and when the correction is performed in units of a predetermined number of lines, The skew feed correction amount calculation means calculates a value obtained by dividing the data relating to the skew feed amount by the A by the predetermined number of lines as the skew feed correction amount for the skew feed amount. Characteristic recording device. 3. The recording apparatus according to claim 1, wherein the skew amount and the skew direction specific to the recording apparatus are fixed in X (X is a positive number) line unit instead of the storage device. And a storage device for storing the skew amount and the skew direction measured in advance by the X-line unit using a detector as data. Recording device. 4. The recording apparatus according to claim 3, wherein when the correction is performed by using a predetermined number of lines as a unit, the skew feed correction amount calculation unit divides the data regarding the skew feed amount into a value obtained by dividing by X. A recording apparatus, wherein a value obtained by multiplying the predetermined number of lines is calculated as the skew feed correction amount for the skew feed amount. 5. A recording apparatus for recording an arbitrary image by sub-scanning the recording sheet N times using N (N is a positive number) colors of ink or ink sheet on the recording sheet, which is unique to the recording apparatus. Assuming that the skew amount and the skew direction change in a constant direction in one color unit, the skew amount and the skew correction amount for correcting the skew direction are set in advance in the one color unit. A recording apparatus, comprising: a storage device that stores the data, and a skew feeding correction system that performs skew feeding correction according to the skew feeding correction amount. 6. The recording apparatus according to claim 5, wherein the skew amount and the skew direction specific to the recording apparatus are fixed in X (X is a positive number) line unit in place of the storage device. In addition, a storage device is newly provided for preliminarily storing the skew feed amount and the skew feed correction amount for correcting the skew feed direction as data in units of the X lines. Recording device.