JPH08216456A - Recorder - Google Patents

Abstract

PURPOSE: To provide a recorder wherein a joint of each line to be caused by reciprocal motion of an ink jet recording head is prevented from couspicuous in a recorder with a conventional head. CONSTITUTION: An output mean to output an image signal corresponding to a picture element of an odd (even) number in the main scanning direction where the ink jet recording head 10 is moved first by a carriage motor 13 and an image signal corresponding to a picture element of an even (odd) number to the ink jet recording head 10, at the time of the second movement immediately after the first movement, and one relative movement distance in the subsidiary scanning direction of at least recording paper 2 is set below a range where recording elements are arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus of an ink jet type (including a bubble jet type) used in facsimiles, printers and the like, and other types.

[0002]

2. Description of the Related Art A conventional ink jet recording apparatus is shown in FIG.
Is shown in the schematic diagram. As shown in FIG. 8, a conventional Ick-jet type recording apparatus includes a removable cassette 101, a recording sheet 102 stored in the cassette 101, and a recording sheet 102.
A pickup roller 103 for feeding out the recording paper 102 one by one, a feed roller 104 for conveying the recording paper 102 fed out,
The feed motor 105 that rotates the feed roller 104, the first pinch roller 106 that presses the recording paper 102 against the feed roller 104, the second pinch roller 107 that prevents the recording paper 102 from floating at the recording position, and the feed motor 105 A gear box 108 for switching rotation transmission,
Position sensor 1 for detecting the leading edge of the recording paper 102 being conveyed
09, an inkjet recording head 110 having a plurality of ink ejection nozzles, and this inkjet recording head 1
A guide shaft 111 for moving the recording paper 102 across the recording paper 102;
1, a belt 112 that reciprocates along the belt 1, and a belt 11
A carriage motor 113 for rotating the ink jet recording head 2 in the forward and reverse directions; a carriage sensor 114 provided on the ink jet recording head 110 for detecting an initial position of the ink jet recording head 110 (a member to be detected is not shown in the figure);
A cleaning unit 115 provided at an initial position of the inkjet recording head 110 for cleaning and capping nozzles, a first transport roller 116 and a first transport roller 116 for sandwiching and transporting the recording paper 102 on which recording is completed.
Pressing roller 117 and second conveying roller 118 and second
The press roller 119, the first recording paper guide 120, the second recording paper guide 121 and the third recording paper guide 122 that guide the recording paper 102, signals from the sensors 109 and 114, and the motors 105, 113, and Control circuit unit 1 for controlling driving of the inkjet recording head 110
And 23. Further, FIG. 9 shows the inkjet recording head 11 included in the control circuit unit 123.
0, a page memory 125, and a schematic circuit block for generating signals for controlling the carriage motor 113. The operation of the inkjet recording device configured as described above will be described below.

When the power is turned on, the control circuit section 123 checks the output of the carriage sensor 114 to see if the ink jet recording head 110 is in the initial position. If inkjet recording head 110
Is not at the initial position, the carriage motor 113 is operated to return the inkjet recording head 110 to the initial position. The return of the inkjet recording head 110 to the initial position is judged by the carriage sensor 114 detecting a member to be detected (not shown in the figure).
When it is confirmed that the inkjet recording head 110 is at the initial position, the apparatus is ready for recording, and the control circuit unit 123 continues to wait for the start of recording.

A recording start signal is given to the control circuit section 123 through an interface or the like not shown in the figure, and at the same time, an image signal for each line and a clock synchronized with the image signal are sent, and as shown in FIG. The image signal is stored in the page memory 125 under the control of the controller 126. At this time, in order to simplify the subsequent read operation, the pixel writing is performed by rearranging the pixels as shown in FIG. That is, since the recording is further performed by the reciprocating movement of the inkjet recording head 110 every 64 lines, the first 64 lines of the first row are in the reading order (that is, from the first pixel) from the first row to the sixth row of the page memory 125.
The image is written in 4 rows. Next, since the recording of the second line is performed on the return path of the inkjet recording head 110, the last pixel (172
The data is written from the 65th row to the 128th row of the page memory 125 in order from the 8th pixel). In this way, the order of pixels is reversed every 64 lines and stored in the page memory 125. On the other hand, recording is started when image signals for at least 64 lines are prepared in the page memory 125. On the other hand, when a recording start signal is output, the feed motor 105 is operated (a connecting cable is not shown in this figure), and the gear box 108
Operation of the pickup roller 103 and the feed roller 1
04 is rotated, and the uppermost recording paper 102 of the cassette 101 is pushed out by the pickup roller 103. The ejected recording paper 102 advances along the first recording paper guide 120, and the first pinch roller 106 and the feed roller 104.
When sandwiched between the sheet and the sheet, the sheet is conveyed by the conveying force of the feed roller 104. When the recording paper 102 starts being conveyed by the conveying force of the feed roller 104, the drive force of the pickup roller 103 is released by the action of the gear box 108.

When the leading edge of the recording paper 102 passes through the position sensor 109, the information is sent to the control circuit section 123 (a connecting cable is not shown in this figure), and the control circuit section 1
At 23, counting is started until the recording paper 102 reaches the recording start position. Recording paper 10 that has passed position sensor 109
The leading edge of 2 further reaches the second pinch roller 107, and then advances to the recording start position. The recording paper 102 sandwiched between the second pinch roller 107 and the feed roller 104 is pressed against the second recording paper guide 121 at the recording position and is prevented from floating. When the control circuit unit 123 detects that the leading edge of the recording paper 102 has passed the recording position, the feed roller 104 is stopped and the recording paper 102 is also stopped.

When the recording paper 102 stops, the control circuit unit 1
The carriage motor 113 is rotated at a constant speed (a connection cable is not shown in the figure) in response to a signal from 23, and the inkjet recording head 110 fixed to the belt 112 is detected by the carriage sensor 114 as a member to be detected (main body). (Not shown in the drawing) is detected, the sheet is fed along the guide shaft 111 from a preset initial position to a predetermined recording start position. The movement amount of the ink jet recording head is determined by the control circuit unit 1 in advance.
It is controlled as the rotation amount of the carriage motor 113 set in 23. When the inkjet recording head 110 reaches the recording start position, the read controller 127 reads the first 64 pixels (corresponding to 64 vertically arranged pixels in FIG. 9) of each of the first to 64 rows of the page memory 125. After being output and held in the latch 129, the basic clock is frequency-divided by the frequency dividing circuit 128 by 1/64 and sent to the driving circuit 130 to operate the inkjet recording head 110 to eject ink. When the ink ejection is completed, the motor driver 131 is synchronized with the signal obtained by dividing the basic clock by 1/64 by the frequency dividing circuit 128.
Operates the carriage motor 113 to move the ink jet recording head 110 connected to the belt 112 by the dot forming density (1/8 mm) (in the figure, a connection cable between the control circuit unit 123, the carriage motor 113 and the ink jet recording head 110). Is not shown). That is, the ink jet recording head 110 moves along the guide shaft 111 across the recording paper 102 and ejects ink from a plurality of nozzles at a constant cycle to form an image.

Further, when an image is recorded for a length (1728 pixels) determined in advance by the control circuit section 123, the carriage motor 113 and the ink jet recording head 110 stop their operations and finish the recording of the first line. FIG. 11 shows the nozzle surface of the inkjet recording head 110. The 64 nozzles 123 are arranged in one row with a dot formation density (1/8 mm), and an image with a width of 8 mm is recorded.

After that, the control circuit section 123 rotates the feed motor 105 by a fixed amount so as to feed the recording paper 102 by the width = 8 mm just recorded. At this time, the first transport roller 116 and the second transport roller 118 are also rotated at the same time, and the recording paper 102 is sent out. The number of rotations of the first transport roller 116 and the second transport roller 118 is greater than the transport amount of the feed roller 104 in order to prevent the recording paper 102 from sagging between the second pinch roller 107 and the first pressing roller 117. The rotation speed is set by the gear box 108 so as to increase a little, and the conveyance force of the first conveyance roller 116 and the second conveyance roller 118 becomes stronger than the conveyance force of the feed roller 104, so that the recording paper 102 is conveyed. The first pressing roller 117 and the second pressing roller 119 so that the accuracy of the amount does not decrease.
The pinch pressure of is set small.

Next, the rotation direction of the carriage motor 113 is set to the reverse direction, and the read controller 127 is set.
Accordingly, the first 64 pixels (corresponding to 64 vertically arranged pixels in FIG. 9) of each of the 65th to 128th rows of the page memory 125 are read out, and the carriage motor is synchronized with the driving cycle of the inkjet recording head 110. 1
13 is reversed at a constant speed and the ink jet recording head 110 is moved in a direction opposite to the previous time, and recording is performed in a width of 8 mm in the same manner as in the forward path. Control circuit unit 123 in advance
After the image is recorded for the image length determined by, the carriage motor 113 is stopped and the recording of the second line is completed. At the same time, the feed motor 104, the first transport roller 116, and the second transport roller 1 are driven for a time determined by the control circuit unit 123.
18 is rotated and the recording paper is conveyed by 8 mm. The image recorded in this way is displayed on each nozzle 12 as shown in FIG.
The ink droplets ejected from No. 3 adhere to and are absorbed by the recording paper 102, and are composed of continuous pixels 124. If the apparatus performs an ideal operation, an image in which the records of the first line, the second line, and the third line are regularly arranged as shown in FIG.

The above operation is continued until the recording of the image is completed over the entire length of one recording sheet 102. Since the length of the recording paper 102 is determined as the length to be recorded,
It is known in the control circuit unit 123. Therefore, the control circuit unit 123 can predict that the trailing edge of the recording sheet 102 will pass the position sensor 109, and if the trailing edge of the recording sheet 102 cannot be detected even after the estimated time has elapsed, the recording sheet 102 will not be detected. An alarm is generated if some trouble occurs in the transportation of 102.

When the recording is completely completed or when a trouble occurs, the carriage motor 113 is rotated to return the ink jet recording head 110 to the initial position. The return of the inkjet recording head 110 to the initial position is determined by the carriage sensor 114 detecting a member to be detected (not shown in the figure).
In this way, recording on the recording paper 102 is completed. Although the ink jet recording head 110 in which the nozzles 123 are vertically arranged in one row has been described above, the same applies to an ink jet recording head in which the nozzles 123 are arranged in a staggered manner and an ink jet recording head in which the nozzles 123 are diagonally arranged in one row or one row. Is.

[0012]

However, according to the above configuration, since the images of the widths (rows) recorded by the movement of the ink jet recording head 110 are stitched together to form one page image, the stitching of each row is performed. There was a problem that the disorder of image continuity was conspicuous at the matching portion. The above problems are
It occurs for the following reasons.

That is, the ink jet recording head 11
0 has a configuration in which a large number of nozzles 123 are arranged vertically or obliquely with respect to the movement, and is designed to record pixels with a width of 8 mm by the reciprocating movement of the inkjet recording head 110. Furthermore, the inkjet recording head 11
The movement of 0 is designed so that recording is always started at the same position under control of a closed loop or the like, and recording is performed at equal intervals. However, assembling error of the mechanical unit, feed error of the carriage motor 113,
The arrival position of the ink droplet fluctuates due to the vibration of the belt 112, the conveyance error of the feed motor 104, the first conveyance roller 116, the second conveyance roller 118, and the like, and as a result, the joint is conspicuous.

For example, as shown in FIG. 13, 2 for the first line
When the position of the pixel 124 in the row is displaced, the continuity of the image is disturbed at the joint, and as a result, the inkjet recording head 110
The joint will be noticeable in the moving direction of. Furthermore, FIG.
As shown in FIG.
If the carry amount of 02 is larger than a predetermined value, a slight gap (white horizontal stripe) is generated between lines, or as shown in FIG. 15, the carry amount of the recording paper 102 by the feed motor 104 in the second line is smaller than the predetermined value. If the amount is small, the images overlap (the density of the overlapped pixels becomes high). Also in this case, the joint is conspicuous in the moving direction of the inkjet recording head 110.

The second factor is that, as a characteristic of ink jet recording, recording is performed by flying ink droplets.
When recording is performed by reciprocating the inkjet recording head 110, pixels are slightly displaced in the moving direction of the inkjet recording head 110. The amount of deviation is the nozzle 123 and the recording paper 102.
It depends on the distance. That is, when the thick recording paper 102 is used, the ink droplets reach the recording paper 102 earlier than the predetermined position, and when the thin recording paper 102 is used, the ink droplets reach the recording paper 102 later. As a result, in the case of thick recording paper, the second line is delayed from the first line as in FIG. In the case of thin recording paper, the opposite is true as shown in FIG. As a result, the joints become noticeable.

Further, as the recording paper becomes thicker, the feeding amount becomes larger, the feeding amount becomes slightly smaller than that of the thin recording paper, and a slight gap (white horizontal stripe) is generated between the lines, or the image is overlapped (overlapping pixels). Will increase, and the joints will also be noticeable.

As a method for solving this problem, the first movement of the ink jet recording head 110 is performed to record an odd number of lines by using the lower half odd nozzles 123 (16 nozzles), and the recording paper 102 is only 4 mm wide (half line). The recording paper 2 is fed, the even number of nozzles 123 (32 nozzles) prints even lines by the second movement of the inkjet recording head 110, the recording paper 102 is further fed by 4 mm (half line), and all odd numbers are fed by the subsequent carriage movement. By recording the odd-numbered nozzles and the even-numbered nozzles separately so that the nozzles 102 (32 nozzles) perform recording of the next odd-numbered line and the recording papers are moved half a line at a time so as to complement each other in the conveyance direction of the recording papers. A method has already been proposed in which the joint between lines becomes less noticeable, but according to such a method, only half the nozzles are used in one recording. Recording time there was a problem that it takes twice. In order to further shorten the time, there is a method of doubling the driving frequency of the nozzles or doubling the number of nozzles, but none of them can be easily realized with a great change in the inkjet recording head.

It is an object of the present invention to propose a recording apparatus which uses a conventional head to make the joints between the lines caused by the reciprocating movement of the ink jet recording head inconspicuous. Another object of the present invention is to provide an apparatus capable of recording at substantially the same recording speed as a conventional recording apparatus while achieving the above object.

[0019]

In order to achieve the above-mentioned object, a recording apparatus of the present invention comprises a recording medium in which a plurality of recording elements are arranged in the sub-scanning direction, and the recording medium in the main scanning direction. Main scanning driving means for relatively moving, sub scanning driving means for relatively moving the recording medium in the sub scanning direction, and odd number (even number) in the main scanning direction when the recording medium is first moved by the main scanning driving means. Image signal corresponding to the pixel of
Output means for outputting image signals corresponding to even-numbered (odd-numbered) pixels in the main scanning direction to the recording medium during the second movement, which is a movement immediately after the first movement, at least the recording 1 in the sub-scanning direction of the medium
The relative movement distance of the times is set to be equal to or less than the range in which the recording elements are arranged.

In order to achieve the above-mentioned other objects,
The present invention relates to a recording body in which a plurality of recording elements are arranged in the sub-scanning direction, a main scanning drive unit for reciprocating the recording body in the main scanning direction, and a sub-scanning drive for relatively moving a recording medium in the sub-scanning direction. Means and an image signal corresponding to an odd-numbered (even-numbered) pixel in the main-scanning direction when the recording medium is moved forward by the main-scanning driving means, and an even-numbered (odd-numbered) pixel in the main-scanning direction when returning. And an output unit for outputting an image signal corresponding to each of the recording media to the recording medium, and at least one relative movement distance in the sub-scanning direction of the recording medium is set to be equal to or less than the range in which the recording elements are arranged. It is a thing.

[0021]

With the above structure, according to the present invention, recording is performed by the ink jet recording head separately for the pixel rows arranged in the vertical direction with respect to the movement of the ink jet recording head for the odd row and the even row, and further for the image block to be recorded. Since the odd-numbered columns and the even-numbered columns of pixels that are arranged perpendicular to the movement of the inkjet recording head are made different and are recombined on the recording paper, the connecting portion of the image blocks on the recording paper caused by the reciprocal recording of the inkjet recording head is Different between the odd-numbered column and the even-numbered column, and as a result, the joints caused by the assembly error of the mechanical unit, the carriage error of the carriage motor, the vibration of the belt, the feeding error of the feed motor, the feeding roller, etc. are different between the odd-numbered column and the even-numbered column on the recording paper. As a result, the joints become inconspicuous.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. Here, the same reference numerals are used for the same or corresponding constituent parts of each embodiment, and the description will be omitted or simplified.

An embodiment in which the present invention is applied to an ink jet type recording apparatus will be described with reference to FIGS. 1 and 2. FIG.
1 shows an overall schematic configuration of the recording apparatus according to the present embodiment. In FIG. 1, the recording apparatus is a detachable cassette 1 containing a recording paper (cut sheet) 11 as a recording medium.
And the recording paper 2 stored in the cassette 1 and the recording paper 2
A pick-up roller 3 that feeds out one by one, a feed roller 4 that conveys the fed recording paper 2, a feed motor 5 that rotates the feed 4, a first pinch roller 6 that presses the recording paper 2 against the feed roller 4, and a recording position. The second pinch roller 7 for preventing the recording paper 2 from being lifted by, the gear box 8 for switching the rotation transmission of the feed motor 5, the position sensor 9 for detecting the leading end of the conveyed recording paper 2, and the plurality of ink ejections. Inkjet recording head 10 with nozzle
A guide shaft 11 for moving the inkjet recording head 10 across the recording paper 2, a belt 12 for reciprocating along the guide shaft 11, and a carriage motor 13 for rotating the belt 12 in the forward and reverse directions. A carriage sensor 14 (a member to be detected is not shown in the figure) provided on the inkjet recording head 10 to detect an initial position of the inkjet recording head 10, and a nozzle provided on the initial position of the inkjet recording head 10. Cleaning unit 15 for performing cleaning and capping, and a first conveying roller 16 and a first pressing roller 17, a second conveying roller 18, and a second pressing roller for nipping and conveying the recording paper 2 on which recording has been completed. 19, a first recording paper guide 20 for guiding the recording paper 2, a second recording paper Id 21 and the third paper guide 22
And a control circuit unit 23 that receives signals from the sensors 9 and 14 and controls the driving of the motors 5 and 13 and the inkjet recording head 10.

Further, FIG. 2 shows an outline of a circuit block which is included in the control circuit section 23 and generates a signal for controlling the ink jet recording head 10, the page memory 25 and the carriage motor 13.

The operation of the ink jet recording apparatus configured as above will be described. When the power is turned on,
The control circuit unit 23 checks the output of the carriage sensor 14 to see if the inkjet recording head 10 is in the initial position. If the inkjet recording head 10 is not in the initial position, the carriage motor 1
3 is operated to return the inkjet recording head 10 to the initial position. The return of the inkjet recording head 10 to the initial position is judged by the carriage sensor 14 detecting a member to be detected (not shown in the figure).

When it is confirmed that the ink jet recording head 10 is in the initial position, the apparatus is ready for recording, and the control circuit section 23 keeps waiting for the start of recording. When a recording start signal, an image signal in units of lines, and a clock synchronized with the image signal are sent to the control circuit unit 23 through an interface or the like not shown in the figure, the image signal is output by the write controller 26 as shown in FIG. It is controlled and stored in the page memory 25. Page memory 25 after this time
In order to simplify the read operation from, the writing is performed with the rearrangement of pixels as shown in FIG. This rearrangement is performed according to the order of pixel formation by the inkjet recording head 10. The recording operation is performed by first recording the odd-numbered pixels or the even-numbered pixels of each line in one scan of the inkjet recording head 10 so that the page memory 2
The number of pixels in each row of 5 is 864 pixels, which is half of 1728 pixels. Furthermore, in order to make the pixel joints due to the movement of the inkjet recording head 10 different between the odd-numbered column and the even-numbered column, the first recording is performed in the lower half (33) of the inkjet recording head 10.
Since the odd-numbered rows are printed by using the 32nd nozzle from the 64th to 64th, the recording paper 2 is moved by 32 nozzles, and all the nozzles (64) of the inkjet recording head 10 are used to print the even-numbered rows. 1st Row to 3rd
Up to the second row, all white data is stored. Subsequently, from the 33rd row to the 64th row, odd-numbered pixels of the image signal from the 1st line to the 32nd line to be recorded are sequentially stored. From the 65th row to the 128th row that follows, recording from the first line to the 64th line on the return path of the inkjet recording head 10
Even pixels of the image signal up to the line are stored in reverse order from the last pixel. From the 129th row to the 192nd row, the odd pixels of the image signal from the 33rd line to the 96th line are sequentially stored. The above operation is repeated to write to the page memory 25.

When a recording start signal is issued at the same time when the image signal is written in the page memory 25, the feed motor 5 is operated (a connecting cable is not shown in the figure), and the gear box 8 operates to pick up the pickup roller. 3, the feed roller 4 is rotated, and the uppermost recording sheet 2 of the cassette 1 is pushed out by the pickup roller 3. The pushed-out recording paper 2 advances along the first recording paper guide 20, and when it is sandwiched between the first pinch roller 6 and the feed roller 4, it is conveyed by the conveyance force of the feed roller 4. When the recording paper 2 starts being conveyed by the conveying force of the feed roller 4, the drive force of the pickup roller 3 is released by the action of the gear box 8.

When the leading edge of the recording paper 2 passes through the position sensor 9, the information is sent to the control circuit unit 23 (a connecting cable is not shown in this figure), and the recording paper 2 is recorded in the control circuit unit 23. Counting starts until the start position is reached. The leading edge of the recording paper 2 that has passed the position sensor 9 further reaches the second pinch roller 7, and then advances to the recording start position. The recording paper 2 sandwiched between the second pinch roller 7 and the feed roller 4 is
It is pressed against the second recording paper guide 21 at the recording position and is prevented from rising. When it is detected by the count of the control path portion 23 that the leading edge of the recording paper 2 passes the recording position, the feed roller 4 is stopped and the recording paper 2 is also stopped.

For recording, when image signals for at least 64 lines are prepared in the page memory 25, the carriage motor 13 is rotated at a constant speed by a signal from the control circuit section 23 (a connecting cable is not shown in this figure). The inkjet recording head 10 fixed to the belt 12 detects a member to be detected (not shown in the figure) by the carriage sensor 14 from an initial position set in advance,
It is fed along the guide shaft 11 to a predetermined recording start position. The movement amount of the inkjet recording head is controlled as the rotation amount of the carriage motor 13 set in advance by the control circuit unit 23.

When the ink jet recording head 10 reaches the recording start position, recording is started. FIG. 4 shows the nozzle surface of the inkjet recording head 10. The 64 nozzles 24 are arranged in one row with a dot formation density (1/8 mm), and an image with a width of 8 mm can be recorded. The first recording is the lower half of the inkjet recording head 10 (from the 33rd to 64th).
The odd-numbered image (4 mm width) is recorded using the (th) nozzle. At the time of recording, the first 64 pixels of 64 rows of the page memory 25 (the upper half 32 pixels arranged vertically in FIG. 3 are 64 white pixels) are read out by the read controller 27 and are held in the latch 29. The basic clock is frequency-divided by the frequency dividing circuit 28 by 1/64 and is sent to the drive circuit 30 to drive the inkjet recording head 10 to eject ink. When the ink ejection is completed, the motor driver 31 causes the carriage motor 13 to synchronize with the signal obtained by dividing the basic clock by 1/64 by the frequency dividing circuit 28.
Is operated to move the inkjet recording head 10 connected to the belt 12 by twice the dot formation density (1/4 mm) (in this figure, the control circuit unit 23, the carriage motor 13, and the connection cable between the inkjet recording head 10 are (Not shown). That is, the inkjet recording head 10 moves across the recording paper 2 along the guide shaft 11 at a double speed corresponding to the driving cycle of the nozzles 24, while ejecting ink from a plurality of nozzles 24 at a constant cycle, and Formation. As a result, the upper half odd-row pixels in the first row are recorded with the even-row pixels omitted.

When the ink jet recording head 10 records an image for a length (864 pixels) determined in advance by the control circuit section 23, the operation is terminated, and the ink jet recording head 10 for one pixel ( 1 / 8m
m) to stop the carriage motor 13. The reason why the inkjet recording head 10 is advanced by one pixel is that the recording on the outward path is completed at the 1727th pixel and the recording on the return path must be started at the 1728th pixel. Thereafter, the control circuit unit 23 displays the width just recorded = 4.
The feed motor 5 is rotated by a fixed amount so as to feed the recording paper 2 by mm. At this time, the first transport roller 16 and the second transport roller 18 are also simultaneously rotated, and the recording paper 2 is sent out. The number of rotations of the first transport roller 16 and the second transport roller 18 is greater than the transport amount of the feed roller 4 in order to prevent the recording paper 2 from slackening between the second pinch roller 7 and the first pressing roller 17. The number of rotations is set by the gear box 8 so as to increase a little, and the carrying force of the first carrying roller 16 and the second carrying roller 18 becomes stronger than the carrying force of the feed roller 4 so that the recording paper 2 is carried. The pinch pressures of the first pressing roller 17 and the second pressing roller 19 are set to be small so that the accuracy of the amount does not decrease.

Next, the rotation direction of the carriage motor 13 is set to the reverse direction, and the next 64 lines of pixels are read from the page memory 25 by the read controller 27. That is, 64 pixels vertically arranged from 65 lines to 128 lines (corresponding to pixels in the first row and even columns) are read out and held in the latch 29, and then the basic clock is frequency-divided by the frequency dividing circuit 28 by 1/64. Drive circuit 3 by synchronizing signal
Then, the ink jet recording head 10 is operated to eject ink. When the ejection of ink is completed, the motor driver 31 operates the carriage motor 13 in synchronization with a signal obtained by dividing the basic clock by 1/64 by the frequency dividing circuit 28, and the inkjet recording head 10 connected to the belt 12.
Is moved by twice the dot formation density (1/4 mm) (the connection cable between the control circuit section 23, the carriage motor 13 and the inkjet recording head 10 is not shown in this figure). That is, the inkjet recording head 10 moves across the recording paper 2 along the guide shaft 11 at a double speed corresponding to the driving cycle of the nozzles 24,
Ink is ejected from a plurality of nozzles 24 at a constant cycle, and an image is formed so as to fill the space between the odd-row pixels recorded on the outward path. By this operation, the pixels in the odd and even columns in the upper half of the first row are aligned, and the even columns in the lower half of the first row are recorded. When the recording of the image determined in advance by the control circuit unit 23 is completed, the ink jet recording head 10 is moved by 1/8 mm to stop the carriage motor 13 in preparation for the recording of the outward path again. After that, the feed motor 4, the first transport roller 16, and the second transport roller 18 are rotated for a time determined by the control circuit unit 23, and the recording paper 2 is transported by 4 mm. Further, the rotation direction of the carriage motor 13 is set to the reverse direction again, and the page memory 2 is read by the read controller 27.
The pixels for the next 64 lines from 5 are read out. That is, 64 pixels (corresponding to the even-numbered pixels in the first row) arranged vertically from 129 lines to 192 lines are sequentially read out and held in the latch 29, and then the frequency divider circuit 28 outputs the basic clock to 1
The sync signal divided by / 64 is sent to the driving circuit 30 to operate the inkjet recording head 10 to eject ink. When the ejection of ink is completed, the motor driver 31 operates the carriage motor 13 in synchronization with the signal obtained by dividing the basic clock by the frequency dividing circuit 28 by 1/64, and the ink jet recording head 10 connected to the belt 12 has a dot formation density of 2 It is moved by double (1/4 mm) (the connection circuit between the control circuit section 23, the carriage motor 13 and the ink jet recording head 10 is not shown in this figure). That is, the inkjet recording head 10 moves across the recording paper 2 along the guide shaft 11 at a double speed corresponding to the driving cycle of the nozzles 24, while ejecting ink from the plurality of nozzles 24 at a constant cycle. Forms an image so as to fill the spaces between the pixels in the even columns. By this operation, the pixels in the even-numbered columns and the odd-numbered columns in the lower half of the first row are aligned, and the recording in the odd-numbered columns in the lower half of the second row is performed. When the recording of the image determined in advance by the control circuit unit 23 is completed, the inkjet recording head 10 is ⅛ to prepare for the recording of the outward path again.
The carriage motor 13 is stopped by feeding only mm. After that, the feed motor 4, the first transport roller 16, and the second transport roller 18 are rotated for a time determined by the control circuit unit 23, and the recording paper 2 is transported by 4 mm.

The above operation is continued until the recording of the image is completed over the entire length of one recording sheet 2. Since the length of the recording paper 2 is determined, the length to be recorded is known in advance by the control circuit unit 23. Therefore, the control circuit unit 23 can predict that the trailing edge of the recording sheet 2 will pass the position sensor 9, and if the trailing edge of the recording sheet 2 cannot be detected even after the predicted time has elapsed, the recording sheet 2 will not be detected. An alarm is generated assuming that some trouble has occurred in the transportation of 2.

When the recording is completely completed or when a trouble occurs, the carriage motor 13 is rotated to return the ink jet recording head 10 to the initial position.
The return of the inkjet recording head 10 to the initial position is determined by the carriage sensor 14 detecting a member to be detected (not shown in the figure). In this way, recording on the recording paper 2 is completed. The inkjet recording head 10 in which the nozzles 24 are vertically arranged in one line
Although the ink jet recording heads in which the nozzles 24 are arranged in a staggered pattern and the ink jet recording heads in which the nozzles 24 are diagonally arranged in a zigzag or in one row have different operations for writing to the page memory, similar operations can be performed. is there.

The image thus recorded is composed of continuous pixels in which the ink droplets ejected from each nozzle 24 are adhered and absorbed on the recording paper 2 as shown in FIG. If the apparatus performs an ideal operation, an image in which the first line, the second line, and the third line are regularly arranged as shown in FIG.

According to this recording method, for example, when a deviation occurs in the even pixels printed in the returning path with respect to the already recorded odd pixels and the deviation is not recovered thereafter, the result is as shown in FIG. Although the shift is clearly visible in the pixel rows at both ends, the shift is every row in the moving direction of the inkjet recording head 10, so that the continuity of the pixels is ensured. Also, as shown in FIG. 7, even if the feed amount of the recording paper 2 by the feed motor 4 becomes larger than a predetermined value at a certain timing, the white portions generated at the joints of the pixels are also inconspicuous because they are placed in every other row. Although not shown in the figure, even when the feeding amount of the recording paper 2 by the feed motor 4 becomes smaller than a predetermined value, the portion of high density due to the overlapping of the pixels which occurs at the joint of the pixels is placed every other row and becomes inconspicuous.

Further, even if the recording paper becomes thicker and the feeding amount of the recording paper 2 becomes larger than the set value, and the recording paper 2 becomes thin and the feeding amount becomes small, the pixel density becomes high due to the white stripes and the overlapping of images. The phenomenon is alleviated, and the joints become less noticeable. Further, the time required for recording also increases the number of times the inkjet recording head 10 reciprocates twice as much as the conventional one plus one, but since the moving speed of the inkjet recording head 10 doubles, the total required time becomes almost the same. .

In this embodiment, the case where the image signals are rearranged at the time of writing to the page memory has been described.
For writing to the page memory, the same configuration can be realized by rearranging in the reading order when the sent image signals are stored as they are for each line and read out. Further, in the present embodiment, the odd columns and the even columns are arranged. Recording was performed by shifting the number of nozzles of the inkjet recording head by half, but it goes without saying that the amount of displacement may be any number of nozzles or more.

In this embodiment, the ink jet recording head 10 which is a recording medium is moved in the main scanning direction of the recording paper 2. However, the present invention is not limited to this. The present invention can also be applied to a configuration in which, etc. are moved. In other words, it is sufficient for the recording medium to move relative to the recording paper in the main scanning direction. Regarding the movement in the sub-scanning direction, the present invention can be applied as long as the recording body and the recording paper move at least relative to each other as in the movement in the main scanning direction, and the present invention is not limited to this embodiment.

[0040]

As is apparent from the above description, according to the present invention, an image signal corresponding to an odd-numbered (even-numbered) pixel in the main scanning direction is generated during the first movement of the recording medium by the main scanning driving means. , Output means for outputting to the recording medium image signals corresponding to even-numbered (odd-numbered) pixels in the main scanning direction at the time of the second movement which is the movement immediately after the first movement, at least of the recording medium. By setting the relative movement distance of one time in the sub-scanning direction to be equal to or less than the range in which the recording elements are arranged, the relative reciprocating movement of the recording medium on the recording paper can be achieved even when the conventional head is used. It is possible to obtain a recording device that makes the joints of the generated lines inconspicuous. Further, by performing the recording during the forward movement and the backward movement, it is possible to obtain an apparatus capable of recording at substantially the same recording speed as the conventional recording apparatus while obtaining the above effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall schematic configuration in an embodiment of the present invention.

FIG. 2 is a diagram showing an outline of a circuit block for generating signals for controlling an inkjet recording head, a page memory and a carriage motor in an embodiment of the present invention.

FIG. 3 is a diagram showing data storage in a page memory according to the embodiment of the present invention.

FIG. 4 is a diagram showing a nozzle arrangement of an inkjet recording head in an embodiment of the present invention.

FIG. 5 is a schematic diagram showing recording of pixels according to an embodiment of the present invention.

FIG. 6 is a schematic diagram showing recording of pixels according to an embodiment of the present invention.

FIG. 7 is a schematic diagram showing recording of pixels according to an embodiment of the present invention.

FIG. 8 is a perspective view showing a schematic overall configuration of a conventional example.

FIG. 9 is a perspective view showing an overall schematic configuration in a conventional example.

FIG. 10 is an inkjet recording head in a conventional example,
The figure which shows the outline of the circuit block which generates the signal which controls the page memory and the carriage motor.

FIG. 11 is a diagram showing data storage in a page memory in a conventional example.

FIG. 12 is a diagram showing a nozzle arrangement of an inkjet recording head in a conventional example.

FIG. 13 is a schematic diagram showing recording of pixels according to a conventional example.

FIG. 14 is a schematic diagram showing recording of pixels according to a conventional example.

FIG. 15 is a schematic diagram showing recording of pixels according to a conventional example.

[Explanation of symbols]

 2 Recording Paper 5 Feed Motor 10 Inkjet Recording Head 13 Carriage Motor 23 Control Circuit Section 24 Nozzle 25 Page Memory 26 Write Controller 27 Read Controller 28 Dividing Circuit 29 Latch 30 Drive Circuit 31 Motor Driver

Claims (3)

[Claims] 1. A recording body in which a plurality of recording elements are arranged in the sub-scanning direction, a main-scanning driving means for relatively moving the recording body in the main-scanning direction, and a sub-direction for relatively moving the recording medium in the sub-scanning direction. An image signal corresponding to an odd-numbered (even-numbered) pixel in the main scanning direction during the first movement of the recording medium by the scan driving means and the main scanning driving means is the movement immediately after the first movement. Output means for outputting image signals corresponding to even-numbered (odd-numbered) pixels in the main scanning direction to the recording medium during the second movement, and at least one relative movement of the recording medium in the sub-scanning direction. A recording apparatus, wherein a distance is set to be equal to or less than a range in which the recording elements are arranged. 2. A recording body in which a plurality of recording elements are arranged in the sub-scanning direction, a main-scanning drive means for reciprocating the recording body in the main-scanning direction, and a sub-direction for relatively moving the recording medium in the sub-scanning direction. An image signal corresponding to an odd-numbered (even-numbered) pixel in the main-scanning direction when the recording medium is moved forward by the scan-driving means and the main-scanning driving means, and an even-numbered (odd-numbered) pixel in the main-scanning direction when returning. And an output unit that outputs an image signal corresponding to each pixel to the recording medium,
At least one relative movement distance of the recording medium in the sub-scanning direction is set to be equal to or less than a range in which the recording elements are arranged. 3. The recording apparatus according to claim 1, wherein the relative movement distance of the recording medium in the sub-scanning direction is set to approximately half the linear distance in which the recording elements are arranged.