JP2000351205A - Ink jet recording apparatus and recording method using the recording apparatus - Google Patents

Abstract

(57) [Summary] [Problem] When printing at the beginning, end, and both of the recording medium without margins, there is no possibility that the recording medium will be stained by the discarded ink, and the printing position of the recording medium is further improved. To provide an ink jet recording apparatus that does not degrade print quality by firmly controlling the printing quality. A print head having a nozzle array in which a number of nozzles are arranged in a sub-scanning direction, a platen provided to face the print head and regulating a printing position of a print medium, and a paper feed roller 8 and a discharge roller 9,
The platen is provided with a first hole 11 in a portion of the platen surface facing a downstream portion of the nozzle array in the sub-scanning direction, and is discarded off the start end 7 of the recording medium when printing the start end 7 without any blank space. Ink 12 is guided to the first hole. A second hole 13 is provided at the end 14 of the recording sheet.

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 having a function of executing recording for zeroing at least one or more margins at the beginning and end of a recording material. The present invention relates to a recording method using the recording device.

[0002]

2. Description of the Related Art A conventional example of a platen structure of an ink jet recording apparatus will be described. The ink jet recording head has a dot forming element array (hereinafter, referred to as a nozzle array) in which a number of dot forming elements (hereinafter, referred to as nozzles) are arranged in the sub-scanning direction. A platen is provided facing the recording head. The platen plays a role in defining the position of the recording paper at the time of recording. A plurality of ribs are arranged on the platen surface of the platen at predetermined intervals in the main scanning direction. The recording paper is supported on the flat top surface of the rib, and its position with respect to the recording head is defined.

In ordinary recording by an ink jet recording apparatus, recording is performed with a margin provided around the start and end of the recording paper, but recording may be performed without a margin from the beginning of the recording paper. In the case of recording without margins, in the conventional platen structure, ink that is displaced from the starting end of the recording paper and is discarded adheres to the platen surface. Occurs.

In view of this, there has been proposed an ink jet printer in which a large hole is provided in the platen surface over the entire area facing the nozzle array of the recording head so that the discarded ink is received in the large hole and does not adhere to the platen surface. . However, when this large hole is provided, the leading end of the recording paper fed by the paper feed roller, which is the recording material feed roller, easily hits the wall of the large hole, and there is a problem that a so-called paper jam easily occurs at this portion. In addition, the presence of the large hole makes it difficult to define the position of the recording sheet firmly at the position facing the nozzle array, so that the distance between the recording head and the recording sheet is not fixed, and there is a problem that the recording quality deteriorates.

[0005] The above-mentioned problems also occur when the end of the recording paper is to be recorded without margins by the ink jet recording apparatus. Since the problem at the end is basically the same as that at the start of the recording paper described above, the description is omitted.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording medium which may be contaminated with abandoned ink when recording at the beginning and / or end of the recording medium without any margin. In addition, an object of the present invention is to provide an ink jet recording apparatus and a recording method using the recording apparatus, in which the recording position of a recording material is firmly supported and defined to prevent the recording quality from deteriorating.

[0007]

According to a first aspect of the present invention, there is provided a recording head having a dot forming element array in which a plurality of dot forming elements are arranged in a sub-scanning direction. A platen for defining the position of a recording material facing the recording head while scanning the recording head in the main scanning direction, and a recording material feed disposed upstream of the recording head. An ink jet recording apparatus comprising: a roller; and a discharge roller disposed downstream of a recording head, wherein the platen has a platen surface facing a downstream portion of the dot forming element array in a sub-scanning direction. The first hole is provided so as to guide the ink, which is deviated from the start end and discarded, to the first hole when the start end of the recording material is recorded without blank space. That is,
The platen is formed such that the first hole faces the opening near the end of the distribution range of the dot forming element array.

In the present invention, the first hole is formed not at the entire platen surface but at a position corresponding to the starting end of the recording material when recording the starting end of the recording material with no blank space. I have. That is, since a position defining function unit for defining the position of the recording material is left in a portion of the platen surface facing the recording head, when recording the starting edge of the recording material without blanks, The ink that has been discarded is guided to the first hole, and the recording medium is firmly supported and defined with respect to the recording head.
Therefore, when recording the start end of the recording material without blanks, there is no possibility that the recording material is stained with the discarded ink,
Further, the position of the recording material at the time of recording is firmly supported and defined, so that the recording quality is not degraded.

According to a second aspect of the present invention, a recording head having a dot forming element array in which a plurality of dot forming elements are arranged in the sub-scanning direction, and the recording head is scanned in the main scanning direction. A platen for defining the position when recording on a recording material facing the recording head; a recording material feed roller disposed upstream of the recording head; and a recording material feed roller disposed downstream of the recording head. An ejection recording roller, wherein the platen is provided with a second hole on a platen surface of a portion facing the upstream portion in the sub-scanning direction of the dot forming element array. When recording at the end of the image without any blank space, the ink ejected from the end and discarded is guided to the second hole. That is, the platen is formed such that the opening faces the second hole near the end of the distribution range of the dot forming element array.

According to this, the second hole is formed not at the entire platen surface but at a position corresponding to the end of the recording material when recording the end of the recording material with no blank space. I have. That is, since the position defining function unit for defining the position of the recording material is left in the portion of the platen surface facing the recording head, when recording the end of the recording material without blanks, The ink that has come off and discarded is guided to the second hole, so that the recording material is firmly positioned with respect to the recording head. Therefore, in the case where the end of the recording material is recorded without blanks, there is no possibility that the recording material is stained with the discarded ink, and the recording position of the recording material is firmly supported and the recording quality is defined. Does not decrease.

According to a third aspect of the present invention, in the ink jet recording apparatus having the first hole, the platen further includes the second hole according to the second aspect. . Thus, when printing without margins at both the start end and the end of the recording material, there is no possibility that the recording material is stained by the discarded ink, and the recording position of the recording material is firmly defined. Does not degrade recording quality.

According to a fourth aspect of the present invention, in the ink jet recording apparatus having the first hole and the second hole, the recording head is controlled by a dot drive control unit for driving the dot forming element array. It is configured to be able to switch between standard interlaced recording in which all dot forming elements of the forming element array are driven and recording, and limited interlaced recording in which driving and recording are limited to only some of the dot forming elements and executed. The limited interlace recording is executed when the start end of the recording material is located in the first hole portion and when the end end of the recording material is located in the second hole portion.

According to the present invention, when the start and end of a recording sheet are recorded without margins, the limited interlace recording is executed, whereby the amount of ink to be discarded and the image to be discarded correspondingly. The data can be reduced, and the degree of cockling in this portion can be reduced. By performing interlaced recording on portions other than the start and end of the recording material, high-quality recording can be performed without lowering the throughput.

According to a fifth aspect of the present invention, in the ink jet recording apparatus having the first hole and the second hole, the recording material is provided on a platen surface within a range opposed to the dot forming element array. There is a flat top surface that contacts and supports from below. Accordingly, the position of the recording material with respect to the recording head can be stably and firmly defined.

According to a sixth aspect of the present invention, in the ink jet recording apparatus having the first hole and the second hole, the platen surface is provided on the downstream side outside the area opposed to the dot forming element array. A flat top surface that supports and supports the recording material from below is located. Thus, even if ink is erroneously attached to the platen surface at a position facing the dot forming element array during printing using all the nozzles, the medium is maintained until the recording material being printed is discharged. Will not get dirty. Further, since the distance from the recording material feed roller to the flat top surface can be set to be long, the recording material conveyance load can be reduced, and the conveyance performance of particularly thick paper can be improved.

According to a seventh aspect of the present invention, in the ink jet recording apparatus having the first hole and the second hole, an ink absorbing material is provided in the hole. With this ink absorbing material, the discarded ink can be stably stored and kept without leaking, and the taking out and replacing work is also easy.

According to an eighth aspect of the present invention, in the ink jet recording apparatus having the first hole and the second hole, a water-repellent net is provided at an opening of the hole, and the net is provided with a water-repellent net. A contacting ink absorber is provided in the hole.

According to this configuration, since the opening of the hole is covered by the net, the recording paper is conveyed in almost the same state as without the hole, and the position is firmly defined. Can be. Further, the discarded ink strikes and adheres to the net, but since it is water-repellent, the attached ink is immediately absorbed by the absorber, so that there is almost no attached ink on the contact surface with the recording material. Become. Therefore, while firmly defining the position of the recording material,
There is almost no risk of the ink reattachment.

According to a ninth aspect of the present invention, in the ink jet recording apparatus having the first hole and the second hole, an openable / closable lid is provided at an opening of the hole, and the lid is provided with: The cover is opened when recording the start or end of the recording material without margins, and closed when recording other than the marginless recording.

According to this configuration, the hole on the platen surface is
The cover is opened when recording the start or end of the recording material with no margin, and closed when recording other than the marginless recording. That is, since the hole which is necessary only when recording the start or end of the recording material with no blank space is opened and closed when it is not necessary, there is no functional waste.

According to a tenth aspect of the present invention, in the ink jet recording apparatus having the lid, the lid has a pivot point below the opening of the hole. It can be opened and closed by rotating around the center. According to this configuration, the mechanism that opens and closes the lid can be eliminated on the recording paper transport path, so that the possibility of occurrence of paper jam can be prevented by providing a new member.

According to an eleventh aspect of the present invention, there is provided a recording head having a dot forming element array in which a plurality of dot forming elements are arranged in the sub-scanning direction, and the recording head being scanned in the main scanning direction. When recording on a recording material facing the recording head, a platen that defines the position,
An end portion in the sub-scanning direction of the recording material in the sub-scanning direction is completely blanked by an ink jet recording apparatus including a recording material feed roller disposed upstream of the recording head and a discharge roller disposed downstream of the recording head. A recording method for recording, wherein ink is ejected in a state where an end portion of a recording material is located within a range of the dot forming element array in a sub-scanning direction, and a part of the ink is located at the position on a platen surface. By discarding in a hole provided locally at a portion facing the end of the recording material, recording is performed without margins at the end of the recording material.

According to this recording method, when the start end of the recording material is recorded without margins, the recording material is not contaminated with the discarded ink without lowering the throughput. The position at the time of recording is firmly supported and defined, and does not degrade the recording quality.

According to a twelfth aspect of the present invention, in the recording method using the ink jet recording apparatus, the recording head may be configured such that, when recording an end portion of a recording material without a blank, the end portion of all dot forming elements. Interlaced recording is performed by driving a part of the recording area to perform recording, and when recording other recording areas, interlaced recording is performed by driving all dot forming elements to perform recording. According to this configuration, the same effect as that of the invention described in claim 4 can be obtained.

According to a thirteenth aspect of the present invention, there is provided a recording head having a dot forming element array in which a plurality of dot forming elements are arranged in the sub-scanning direction, and scanning the recording head in the main scanning direction. When recording on a recording material facing the recording head, a platen that defines the position,
An ink jet recording apparatus comprising: a recording material feed roller disposed upstream of the recording head; and a discharge roller disposed downstream of the recording head. A flat top surface is provided on the platen surface of the portion opposed to the element array to support the recording material in contact therewith from below, and a central hole is provided at a substantially central portion of the top surface in the recording material transport direction, When recording the start and / or end of the recording material without any blank space, the recording material is formed so as to guide the ink that has been displaced from the start or end and discarded to the central hole.

According to this configuration, it is possible to execute recording without margins at the start and / or end of the recording material with the single central hole while stably supporting the recording material with the flat top surface.

According to a fourteenth aspect of the present invention, a dot forming element array in which a plurality of dot forming elements are arranged in the sub-scanning direction is provided for each of a plurality of colors.
A recording head in which a plurality of dot forming element arrays corresponding to each color are sequentially arranged in the sub-scanning direction, and a method for recording on a recording material facing the recording head while scanning the recording head in the main scanning direction. An ink jet recording apparatus comprising: a platen for defining the position; a recording material feed roller disposed upstream of the recording head; and a discharge roller disposed downstream of the recording head. The platen is provided with a first hole in a platen surface of a portion facing a downstream portion in the sub-scanning direction for each of the plurality of dot forming element arrays corresponding to each color, and A second hole is provided on a platen surface of a portion opposing the upstream portion of the recording medium, and the start end of the recording material is recorded without blanks in each of the plurality of dot forming element arrays corresponding to each color. In this case, the ink ejected from the starting end and discarded is guided to the first hole, and the ink ejected from the end and discarded from the end is guided to the second hole when recording the end of the recording material without any blank space. Have been.

According to this configuration, even when a plurality of color nozzles are vertically arranged, the first hole and the second hole are provided for each dot forming element array of each color. It is possible to execute the marginless printing at the start and end of the recording material, similarly to the recording head in which the color nozzles are arranged horizontally.

According to a fifteenth aspect of the present invention, in the ink jet recording apparatus according to the thirteenth aspect, the recording head is controlled by a dot drive control unit for driving the dot forming element array. The recording medium is configured to be capable of switching between standard interlaced recording in which all dot forming elements are driven to perform recording and limited interlace recording in which only certain dot forming elements are driven to perform recording. The limited interlace recording is executed when the start end and the end of are limited to the center hole.

According to this configuration, when recording is performed without margins on the upper and lower sides of the recording paper, the limited interlace recording is executed to reduce the amount of ink to be discarded and the image data to be discarded correspondingly. The degree of cockling in this portion can be reduced while reducing the amount of cockling. By performing interlaced recording on portions other than the start and end of the recording material, high-quality recording can be performed without lowering the throughput.

According to a sixteenth aspect of the present invention, in the ink jet recording apparatus according to the fourteenth aspect, the recording head is controlled by a dot drive control unit for driving the dot forming element array. The recording medium is configured to be capable of switching between standard interlaced recording in which all dot forming elements are driven to perform recording and limited interlace recording in which only certain dot forming elements are driven to perform recording. Is located at each of the first hole portions corresponding to the plurality of dot forming element arrays corresponding to each color, and when the end of the recording material is located at each of the second hole portions. , The limited interlace recording is executed.

According to this configuration, the above-described limited interlace printing is performed even when a printing head in which a plurality of color nozzles are arranged in a vertical arrangement is used when printing is performed with no blank space above and below the printing paper. The amount of ink to be discarded and the image data to be discarded correspondingly can be reduced, and the degree of cockling in this portion can be reduced. By performing interlaced recording on portions other than the start and end of the recording material,
High-quality recording can be performed without lowering the throughput.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a main part of an ink jet recording apparatus according to a first embodiment of the present invention, in which a leading edge of a recording sheet is recorded without a margin, and FIG. FIG. 3 is a cross-sectional view of a main part in a state where the end of a recording sheet is recorded without blanks.

In the present embodiment, as shown in FIG.
The platen 3 has a first hole 11 on a platen surface of a portion facing a downstream portion of the nozzle array 2 in the sub-scanning direction. The first hole 11 plays a role of receiving all of the ink 12 that has come off from the start end 7 and discarded in the first hole 11 when the start end 7 of the recording paper 4 is recorded without blank space. In a paper width direction so as to be long (see FIGS. 5 and 6 described later) or partially partitioned.

That is, in the present embodiment, the first hole 11
Is formed not locally on the entire platen surface but locally at a position corresponding to the start end 7 of the recording paper 4 when recording the start end 7 without margins. In a portion of the platen surface facing the recording head 1, a position defining function unit for defining the position of the recording paper 1 at the time of recording is left. That is, the rib 5 and its flat top surface 6 are formed so as to be located in a range opposed to the nozzle array 2. Therefore, when recording the start end 7 of the recording paper 4 without any blank space, the ink 12 that has been displaced from the start end 7 and discarded is guided to the first hole 11, so that the recording paper 4 is placed on the flat top surface 6 of the rib 5. Position is firmly defined. Thus, the position of the recording paper 4 with respect to the recording head 1 can be stably and firmly defined.

Further, in the present embodiment, the nozzle array 2
The second hole 13 is provided in the platen surface of the portion facing the upstream portion in the sub-scanning direction. As shown in FIG. 2, the second hole 13 is formed so as to guide the ink 12 that has come off from the end 14 and discarded to the second hole 13 when the end 14 of the recording paper 4 is recorded without any blank space. And the role is the same as that of the first hole 11. In the figure, reference numeral 8 denotes a paper feed roller, and reference numeral 9 denotes a discharge roller, all of which are known.

In the above embodiment, the platen having both the first hole 11 and the second hole 13 is shown. However, the platen may be provided with only one of the holes. It is determined based on the way of recording.

Further, while the flat top surface 6 of the rib 5 is located within a range opposed to the nozzle array 2, as shown in FIGS. The structure may be such that the flat top surface 6 is located on the downstream side outside the opposed range. When adopting this structure,
Even if ink adheres to the platen surface at a position facing the nozzle array 2 by mistake during recording using all the nozzles, the recording paper 4 during recording is stained until the recording paper 4 is discharged. There is no. Further, since the distance from the recording material feed roller 8 to the flat top surface 6 can be set to be long, the transport load of the recording paper 4 can be reduced, and the transportability of particularly thick paper can be improved.

In this embodiment, a nozzle drive control unit 23 (shown only in FIG. 1 and omitted in other drawings) for driving the nozzle array 2 of the recording head 1 is disclosed in US Pat.
The interlaced recording disclosed in US Pat. No. 4,585 and the like, and the margins at the beginning or end of the recording paper disclosed in JP-A-9-71009 and JP-A-11-291506 are further described. In order to make the size as small as possible, it is configured to switch and execute “limited interlace recording” in which only a part of all nozzles is limitedly driven and recorded. That is, as shown in FIGS. 1, 3, and 5, a portion 18 of the nozzle array 2
Are driven by the nozzle drive control unit 23 so that ink is ejected only to the start end 7 side of the recording paper 4. Similarly, only the part 19 of the nozzle array 2 is driven on the end 14 side of the recording sheet 4 as shown in FIGS. 2, 4 and 6.

Here, based on FIG. 29, in the recording head 1, the dot driving control unit 23 for driving the dot forming element array drives all the dot forming elements of the dot forming element array 2 for recording. Interlaced printing and limited interlaced printing, in which printing is performed by driving only some of the dot forming elements, can be switched and executed, and the starting end 7 of the recording paper 4 is connected to the first hole 1.
It will be described that the limited interlace recording is executed when the recording paper 4 is located at one portion and when the end 14 of the recording paper 4 is located at the second hole 13.

FIG. 29 is a diagram showing the positions of the nozzles in the sub-scanning direction during each main scan. The vertical direction in FIG. 29 corresponds to the sub-scanning direction. In order to avoid cheekiness in the figure, the nozzle positions are sequentially shifted to the right for each main scan. For ease of understanding, the nozzle array 2 and holes provided on the platen for discarding ink are also shown. In FIG. 29, P1, P
.. Means the first and second main scans. The circled numbers indicate the positions of the nozzles in the sub-scanning direction in each scan. A number surrounded by a thick line means that a dot is formed at that position, and a number surrounded by a thin line means that the nozzle is located but no dot is formed. are doing. The value shown on the left side of FIG. 29 is a raster number RN assigned to each raster for the sake of convenience. As will be described later, the lowermost raster on which an image is printed while guaranteeing the paper feed accuracy in the sub-scanning by this recording method is rasterized. The number is set to 0 (RN = 0), rasters below it are represented by positive numbers, and rasters above are represented by negative numbers. The number expressed in the form of “L =” indicates the paper feed amount in each sub-scan by the number of rasters.

When the standard print processing routine is started, dot formation data is set, and dots are formed while performing main scanning. In the example of FIG. 29, since the nozzle pitch is equivalent to four rasters, the data for dot formation is obtained by sequentially extracting data in the main scanning direction every four rasters from the head of the previously input image data. In the main scan P1 in FIG. 29, the region above the raster number -28 (RN ≦ −28
Area), dots are formed every four rasters.

Next, the paper feed roller 8 is driven and controlled,
Sub-scanning is performed. In the example of FIG. 29, paper feed corresponding to 7 rasters is performed, and the position of the recording head 1 moves to P2 in FIG. The feed amount is set to a feed amount at which the nozzles can be used most effectively, among various feed amounts at which an image can be recorded without a raster omission by the interlace method. The feed amount can be determined according to the nozzle pitch, the number of nozzles, and the number of scan repetitions. However, since the setting method is well known, the description will be omitted.

After performing the sub-scan, dots are formed at the position indicated by the main scan P2, that is, the area above the raster number -20. By repeating this process, an image can be recorded while rasters are formed intermittently. For example, as shown in FIG. 29, when the main scan P4 is executed, raster numbers -34 to -25 are displayed. It can be seen that the image is completed in the area. Hereinafter, this process is repeatedly executed until the image formation is completed, and an image is formed. However, in the present embodiment, as will be described later, printing is performed in another print mode after the standard printing process. Therefore, the end of the image formation here means that the printing of the entire input image data is completed. Rather, the end of image formation by the standard print processing routine.

After the formation of the image by the standard printing process is completed, the printing of the image by the intermediate process is executed. The dot formation flow itself in the intermediate processing is the same as the standard print processing routine. In the intermediate processing, the paper feed amount in the sub-scan differs from the paper feed amount in the standard printing.

In the intermediate processing, 7 in the standard processing
Different from the paper feed amount corresponding to the raster, first, paper feed corresponding to four rasters is executed to form a raster (the main scanning P in FIG. 29).
5). The meaning of these four rasters will be described later. next,
A raster is formed while feeding three rasters (FIG. 2
9 main scans P6 to P8). At this time, since there is a case where nozzles overlap at already formed raster positions, such as the first nozzle in the main scan P7, such nozzles mask the dot formation data and perform dot formation in a line. I will not be touched. The position of the main scan P8 in FIG. 29 is a limit position at which paper feeding can be performed while guaranteeing accuracy. In other words, at this time, the lower end of the paper 4 is in a state immediately before the paper 4 comes off the paper feed roller 8.

The setting of the feed amount in the intermediate processing will be described. In the intermediate processing of this embodiment, the paper feed is performed at a constant feed amount of three rasters following the transient feed amount of four rasters. This constant feed amount corresponds to an interlace feed amount when three nozzles having a nozzle pitch of four rasters are provided. Also,
The transient feed of four rasters, which is executed at the beginning of the intermediate processing, is also set so as not to cause a dropout of the raster. The transitional feed amount is determined based on both parameters such as the feed amount in the standard process and the parameters such as the feed amount in the intermediate process.

As described above, the interlace printing in which the number of used nozzles is apparently reduced in the intermediate processing is performed by adopting such a printing method, in an area where an image can be printed in a state where the paper feeding accuracy is guaranteed. Can be extended.

In the extended print area, dots are recorded while performing sub-scanning by feeding three rasters. When set in this way, the feed amount for recording by the interlace method is further reduced to three rasters.

After setting as described above, the setting of the nozzles to be used is performed, and the data mask processing is performed for the nozzles not to be used. The data mask process is a process for preventing dots from being formed.

Next, extended print processing is executed. In the intermediate processing, the paper feed amount in the sub-scan differs from the paper feed amount in the standard printing. As described above, in the extended printing process, dots are formed by an interlace method using a feed amount of three rasters. At this time, since an image has already been formed in a region above the raster number 0 (region where RN ≦ 0), the nozzles existing in such region do not form a dot.

As described above, in the area where standard printing is performed, a high-quality image can be obtained by the interlace method. Further, by adopting the intermediate processing, it is possible to expand the area where an image can be formed while guaranteeing the accuracy of paper feeding. Since the recording of the image by the interlace method is performed even in the area extended in this way, a high-quality image can be obtained. The area where the image can be recorded can be extended downward by performing extended printing.

The standard interlace recording of all nozzle driving described with reference to FIG. 29 and the extended processing in which the nozzles to be used are limited, that is, limited interlace recording, are described in JP-A-11-21-2.
This is a known method described in JP-A-91506.
FIGS. 11A to 11D show a process of performing the marginless recording at the start end 7 of the recording paper 4 by executing the standard interlace recording and the limited interlace recording. 1st hole 1
After the leading edge 7 of the sheet reaches 1, a part 18 of the nozzle array 2 is used for the leading edge, and the nozzles of the part 18 are used to perform the method described with reference to FIG.
The extended printing process is executed, and recording without a margin at the beginning is performed while a little ink is discarded into the first hole 11 as shown in each figure.

FIGS. 12A to 12D show a process of performing the marginless recording at the end 14 of the recording paper 4 by executing the standard interlace recording and the limited interlace recording. Basically, the recording is the same as the marginless recording at the start end 7, and the description is omitted.

In the above, an example in which marginless recording is executed by limited interlace recording has been described. When recording the leading edge 7 and the trailing edge 14 of the recording paper 4 without margins as described above,
By executing the limited interlace recording, the amount of ink 12 discarded in the first hole 11 and the second hole 13 can be reduced in the example of FIG.
The degree of cockling in the portion can be reduced. Then, by performing normal interlaced recording on portions other than the starting end 7 and the ending end 14 of the recording paper 4, it is possible to execute recording while maintaining high-quality recording without lowering the throughput.

According to the embodiment shown in FIG. 1 and FIG. 2, when recording the start edge 7 and the end edge 14 of the recording paper 4 without any blank space, the ink 12 that has deviated from the start edge 7 and the end edge 14 and has been discarded. The recording paper 4 is guided to the first hole 11 and the second hole 13, respectively. At this time, the position of the recording paper 4 with respect to the recording head 1 is firmly defined by the flat top surface 6 of the rib 5. Therefore, when the start end 7 and the end 13 of the recording sheet 4 are recorded without blanks, there is no possibility that the recording sheet 4 will be stained by the reattachment of the discarded ink 12, and the recording position of the recording sheet 4 is firmly fixed. It is possible to perform recording while maintaining high recording quality.

FIG. 7 shows another embodiment of the ink jet recording apparatus according to the present invention, in which an ink absorber is added to the embodiment of FIG. That is, the first
The ink absorber 15 is provided in the bottom of the hole 11 and the second hole 13.
Is provided. Examples of the ink absorber 15 include a fibrous aggregate such as a synthetic resin continuous foam and a nonwoven fabric. With this ink absorber 15, the discarded ink 12 can be stably stored without leaking, and the removal and replacement work can be easily performed.

FIG. 8 shows still another embodiment of the present invention, in which water-repellent nets 16 and 17 are provided at the openings of the first hole 11 and the second hole 13, respectively. I have. The ink absorber 15 is provided in the first hole 11 and the second hole 13 so as to be in contact with the nets 16 and 17. According to the present embodiment, the net 16,
17, the openings of the first hole 11 and the second hole 13 are covered.
This is almost the same state as when there is no 1, 13 and the position of the recording paper 4 can be firmly defined. Further, the discarded ink 12 hits and adheres to the nets 16 and 17, but since it is water repellent, the adhering ink is immediately absorbed by the ink absorber 15, and the contact surface with the recording paper 4 is Almost no attached ink is present.
Therefore, while the position of the recording paper 4 is firmly defined, the possibility of re-adhesion of the discarded ink can be almost eliminated.

FIGS. 9 and 10 show still another embodiment of the present invention, wherein lids 20 and 21 which can be opened and closed are provided at the openings of the first hole 11 and the second hole 13, respectively. The lids 20 and 21 are opened when recording the leading edge 7 (FIG. 9) or the trailing edge (FIG. 10) of the recording paper 4 with no margin, and closed when recording other than the marginless recording. The opening / closing drive is performed by a controller (not shown). Further, in the present embodiment, the lids 20 and 21 have a pivot point 22 below the opening of the first hole 11 and the second hole 13, and pivot around the pivot point 22. It is opened and closed by a drive controller (not shown).

According to the present embodiment, the first platen surface
The hole 11 and the second hole 13 are opened by the lids 20 and 21 when recording the leading edge 7 or the trailing edge 14 of the recording paper 4 with no blank space, and are closed at times other than the above-mentioned blank blank space, so that they are functionally functional. There is no waste. Further, since the rotation fulcrum 22 is located below the openings of the holes 20 and 21, a mechanism for opening and closing the lids 20 and 21 on the conveyance path of the recording paper 4 can be eliminated. Therefore, by providing a new member, it is possible to prevent the risk of occurrence of paper jam from increasing.

Next, FIG. 13 is a schematic cross-sectional view of a principal part in a state where recording is performed at the starting end of recording paper in the ink jet recording apparatus according to the embodiment having the center hole 25. FIG. FIG. 14 is a plan view of a main part in a state where recording is performed at a start end of recording paper by the ink jet recording apparatus of FIG. 13. The platen 3 is provided with a flat top surface 6 that supports the recording paper 4 from below under the platen surface facing the dot forming element array 2, and conveys the recording paper 4 on the top surface 6. A central hole 25 is provided substantially at the center in the direction. A part 24 of the nozzle array 2 at a position facing the center hole 25 is used for marginless printing. Recording paper 4
Ink 1 that is separated from the start end 7 or the end 14 when the start end 7 and / or the end 14 of the ink is recorded without blank space
2 is formed so as to be guided to the central hole 25.

According to this configuration, the flat top surface 6
It is possible to execute the marginless recording at the start end 7 and / or the end 14 of the recording paper 4 with one center hole 25 while supporting the recording paper 4 stably.

FIG. 15 shows an ink jet type recording apparatus having a center hole 25 according to the embodiment.
FIG. 16 is a schematic cross-sectional view of a main part in a state where recording is performed on the recording paper 4. FIG. . 13 and 14 are basically the same as those in FIGS.

FIG. 17 shows an ink jet recording apparatus according to an embodiment in which three dot forming element arrays 2a, 2b, 2c corresponding to three colors are arranged in the sub-scanning direction. FIG. 4 is a schematic cross-sectional view of a main part in a state where recording is performed on a recording medium. FIG. 18 is a plan view of a main part in a state where recording is performed on the starting end 7 of the recording paper 4 by the ink jet recording apparatus in the state of FIG. The recording head 1 has dot forming element arrays 2a, 2b, and 2c for three colors in which a plurality of dot forming elements are arranged in the sub-scanning direction.
Three dot forming element arrays 2a, 2 corresponding to each color
b, 2c are sequentially arranged in the sub-scanning direction. The state shown in this figure is for the dot forming element array 2 located at the most upstream side.
Limited interlaced recording is performed in which a margin is formed at the start end 7 of the recording paper 4 by a part 30 of the recording paper 4.

The platen 3 is provided with a first hole 27 on a platen surface of a portion facing the downstream portion in the sub-scanning direction with respect to the dot forming element array 2a corresponding to one color, and A second hole 26 is provided on a platen surface of a portion facing the upstream portion in the direction. For the dot forming element array 2b corresponding to another color, a first hole 28 is provided on a platen surface of a portion facing the downstream portion in the sub-scanning direction, and faces the upstream portion in the sub-scanning direction. A second hole 27 is provided in the platen surface of the portion. Further, for the dot forming element array 2c corresponding to the other colors, a first hole 29 is provided on a platen surface of a portion facing a downstream portion in the sub-scanning direction, and a first hole 29 is provided on an upstream portion in the sub-scanning direction. The second part of the platen surface
A hole 28 is provided. As described above, the first hole 27 of the dot forming element array 2a is used as it is as the second hole 27 of the dot forming element array 2b. Similarly, the first hole 28 of the dot forming element array 2b is used as it is as the second hole 28 of the dot forming element array 2c.

When the starting end 7 of the recording paper 4 is recorded without any blank space on each of the plurality of dot forming element arrays 2a, 2b, 2c corresponding to each color, the dot is separated from the starting end 7 and discarded. The first ink 27
When recording the end 14 of the recording material without any blank space, the ink ejected from the end 14 and discarded is guided to the second hole 26.

According to this configuration, even when a plurality of color nozzles are vertically arranged, the first holes 27, 28, 29 and the second holes are provided for each dot forming element array of each color.
Since the holes 26, 27, and 28 are provided, printing without margins can be executed at the start end 7 and the end end 14 of the recording material without changing from the recording head in which the color nozzles are arranged horizontally.

FIG. 19 is a schematic cross-sectional view of a principal part in a state where recording is performed on the starting end 7 of the recording paper 4 by the dot forming element array 2b located at the center of the ink jet recording apparatus. FIG. 11 is a plan view of a main part in a state where recording is performed on the starting end 7 of the recording paper 4 by the ink jet recording apparatus in a state 19.

FIG. 21 shows a dot forming element array 2c on the downstream side of the ink jet type recording apparatus.
FIG. 2 is a schematic cross-sectional view of a main part in a state where recording is performed on FIG.
2 is a plan view of a main part of a state where recording is performed on the starting end 7 of the recording paper 4 by the ink jet recording apparatus in the state of FIG.

As described above, for all three colors,
Recording without margins can be easily executed.

FIG. 23 is a schematic cross-sectional view of a principal part in a state where recording is performed on the trailing end 14 of the recording paper 4 in the dot forming element array 2a on the upstream side. FIG. 24 is a plan view of a main part in a state where recording is performed on the trailing end 14 of the recording paper 4 by the ink jet recording apparatus in the state of FIG. Here, the second hole 2
6 is used for discarding ink.

FIG. 25 is a schematic cross-sectional view of a principal part in a state where recording is performed on the end 14 of the recording paper 4 by the dot forming element array 2b located in the center of the ink jet recording apparatus. It is a principal part top view in the state where recording is performed at the end 14 of the recording paper 4 by the ink jet recording apparatus in the state of 25. Here, the second hole 27 is used for discarding ink.

FIG. 27 shows the end 1 of the recording paper 4 in the dot forming element array 2c on the downstream side of the ink jet recording apparatus.
FIG. 4 is a schematic cross-sectional view of main parts in a state where recording is performed on No. 4. FIG. 28 is a plan view of an essential part in a state where recording is performed on the end 14 of the recording paper 4 by the ink jet recording apparatus in the state of FIG. Here, the second hole 228 is used for discarding ink.

[0074]

According to the present invention, at the time of recording without margins at the start and end of the recording material, ink discarded from the start and end is guided to the first and second holes, respectively.
However, the position of the recording material with respect to the recording head is firmly defined by the position defining function unit. Therefore, when recording is performed without margins at the beginning and end of the recording material, there is no possibility that the recording material is stained with the discarded ink, and the recording position of the recording material is firmly defined to improve the recording quality. Do not lower.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of an ink jet recording apparatus according to a first embodiment of the present invention, in which a start edge of a recording sheet is recorded without a margin.

FIG. 2 is a cross-sectional view of a main part of the first embodiment in a state where the end of a recording sheet is recorded without a blank space.

FIG. 3 is a cross-sectional view illustrating a main part of an ink jet recording apparatus according to a second embodiment of the present invention, in which a start edge of a recording sheet is recorded without blanks.

FIG. 4 is a cross-sectional view of a principal part in a state in which the end of a recording sheet is recorded without a margin according to the second embodiment.

FIG. 5 is a plan view of a main part in a state where the starting end of the recording paper is recorded by the ink jet recording apparatus of FIG. 1;

FIG. 6 is a plan view of a main part in a state where the end of a recording sheet is recorded by the ink jet recording apparatus of FIG. 1;

FIG. 7 is a cross-sectional view of a main part of another embodiment of the platen of the ink jet recording apparatus according to the present invention, in which a start edge of a recording sheet is recorded without a margin.

FIG. 8 shows still another embodiment of the present invention,
FIG. 3 is a cross-sectional view of a main part in a state where the starting end of the recording paper is recorded without a margin.

FIG. 9 shows still another embodiment of the present invention,
FIG. 3 is a cross-sectional view of a main part in a state where the starting end of the recording paper is recorded without a margin.

FIG. 10 is a cross-sectional view of a main part of the embodiment of FIG. 9 in a state where the end of a recording sheet is recorded without blanks.

11 (A), 11 (B), 11 (C).
FIG. 11D is a cross-sectional view of a principal part showing a state where interlaced printing without margins is being performed at the beginning of a recording sheet by the ink jet recording apparatus shown in FIG.

12 (A), 12 (B) and 12 (C).
FIG. 12D is a cross-sectional view of a main part showing a state in which interlaced recording without margins is being performed at the end of recording paper by the ink jet recording apparatus shown in FIG.

FIG. 13 is a schematic cross-sectional view of a principal part in a state where recording is performed at a starting end of a recording sheet in the ink jet recording apparatus according to the embodiment having a central hole.

FIG. 14 is a plan view of a main part in a state where recording is performed at a starting end of a recording sheet by the ink jet recording apparatus of FIG. 13;

FIG. 15 is a schematic cross-sectional view of a principal part in a state where recording is performed at the end of a recording sheet in the ink jet recording apparatus according to the embodiment having a central hole.

FIG. 16 is a plan view of a main part in a state where recording is performed at the end of a recording sheet by the ink jet recording apparatus of FIG. 15;

FIG. 17 illustrates a state in which three dot forming element arrays corresponding to three colors are arranged in the sub-scanning direction. It is an outline principal part sectional view of a state.

FIG. 18 is a plan view of a main part in a state where recording is performed at a start end of a recording sheet by the ink jet recording apparatus in the state of FIG. 17;

FIG. 19 shows a state in which three dot forming element arrays corresponding to three colors are arranged in the sub-scanning direction, and a dot forming element array located at the center of the ink jet recording apparatus according to the embodiment records at the beginning of recording paper. FIG. 4 is a schematic cross-sectional view of a main part in a state in which it is in a state.

FIG. 20 is a plan view of a main part in a state where recording is performed at the start end of recording paper by the ink jet recording apparatus in the state of FIG. 19;

FIG. 21 is a diagram illustrating a state in which three dot forming element arrays corresponding to three colors are arranged in the sub-scanning direction. It is an outline principal part sectional view of a state.

FIG. 22 is a plan view of a main part in a state where recording is performed at a start end of a recording sheet by the ink jet recording apparatus in the state of FIG. 21;

FIG. 23 is a diagram illustrating an example in which three dot forming element arrays corresponding to three colors are arranged in the sub-scanning direction. It is an outline principal part sectional view of a state.

24 is a plan view of a principal part in a state where recording is performed at the end of recording paper by the ink jet recording apparatus in the state of FIG. 23;

FIG. 25 shows a state in which three dot forming element arrays corresponding to three colors are arranged in the sub-scanning direction, and a dot forming element array located at the center of the ink jet recording apparatus according to the embodiment records at the end of a recording sheet. FIG. 4 is a schematic cross-sectional view of a main part in a state in which it is in a state.

26 is a plan view of a main part in a state where recording is performed at the end of recording paper by the ink jet recording apparatus in the state of FIG. 25;

FIG. 27 shows a state in which three dot forming element arrays corresponding to three colors are arranged in the sub-scanning direction, and a dot forming element array on the downstream side of the ink jet recording apparatus according to the embodiment records at the end of recording paper. It is an outline principal part sectional view of a state.

FIG. 28 is a plan view of a main part in a state where recording is performed at the end of recording paper by the ink jet recording apparatus in the state of FIG. 27;

FIG. 29 is an explanatory diagram showing how dots are recorded by standard interlace recording and limited interlace recording used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording head 2 Nozzle array 3 Platen 4 Recording paper 5 Rib 6 Top part 7 Beginning of recording paper 11 First hole 12 Discarded ink 13 Second hole 14 End of recording paper 15 Ink absorber 16,17 Netting 18,19 Part of nozzle array 20, 21 Lid 22 Rotation fulcrum

Claims (16)

[Claims] 1. A recording head having a dot forming element array in which a plurality of dot forming elements are arranged in a sub-scanning direction, and a recording material which scans the recording head in a main scanning direction and which faces a recording material facing the recording head. A platen for defining the position of the recording head; a recording material feed roller disposed upstream of the recording head; and a discharge roller disposed downstream of the recording head. Is provided with a first hole on a platen surface of a portion of the dot forming element array facing a downstream portion in the sub-scanning direction, and is discarded off the starting end of the recording material when the starting end of the recording material is recorded without blank space. An ink jet recording apparatus formed so as to guide ink to the first hole. A recording head having a dot forming element array in which a plurality of dot forming elements are arranged in a sub-scanning direction;
A platen for defining the position of a recording material facing the recording head while scanning the recording head in the main scanning direction, and a recording material feed disposed upstream of the recording head. A roller, and a discharge roller disposed downstream of the recording head, wherein the platen is provided with a second hole in a platen surface of a portion facing the upstream portion of the dot forming element array in the sub-scanning direction. And an ink jet recording apparatus formed so as to guide the ink, which is displaced from the end and discarded, to the second hole when recording the end of the recording material with no blank space. 3. An ink jet recording apparatus according to claim 1, further comprising the second hole according to claim 2. 4. The recording head according to claim 1, wherein the recording head drives all the dot forming elements of the dot forming element array for recording by a dot drive control unit that drives the dot forming element array. And a limited interlace recording in which only a part of the dot forming elements are driven and recorded, and the recording medium can be switched between the standard interlace recording and the limited interlace recording. An ink-jet recording apparatus in which the limited interlace recording is executed when the recording material is positioned and when the end of the recording material is positioned in the second hole portion. 5. The flat platen surface according to claim 1, wherein the platen surface has a flat top surface which supports the recording material in contact with the dot forming element array from below in a range opposed to the dot forming element array. Inkjet recording device located. 6. A flat platen surface according to claim 1, wherein the platen surface has a flat surface that supports the recording material in contact with the recording material from below the downstream side outside a range facing the dot forming element array. Ink jet recording device where the top surface is located. 7. The ink jet recording apparatus according to claim 1, wherein an ink absorber is provided in the hole. 8. The water-repellent net according to claim 1, wherein a water-repellent net is provided at an opening of the hole, and an ink absorber in contact with the net is provided in the hole. Ink jet recording device. 9. The recording medium according to claim 1, wherein an openable and closable lid is provided at an opening of the hole, and the lid is used when recording a start end or an end of a recording material without a margin. An ink jet recording apparatus which is opened and closed at times other than the marginless recording. 10. The ink jet recording apparatus according to claim 9, wherein the lid has a pivot point below the opening of the hole, and is rotated around the pivot point to be opened and closed. apparatus. 11. A recording head having a dot forming element array in which a plurality of dot forming elements are arranged in a sub-scanning direction, and a recording material which scans the recording head in a main scanning direction and faces a recording material facing the recording head. Ink-jet recording comprising a platen for defining the position when recording, a recording material feed roller disposed upstream of the recording head, and a discharge roller disposed downstream of the recording head. What is claimed is: 1. A recording method for recording an end portion of a recording material in a sub-scanning direction without a margin by a device, wherein ink is ejected in a state where the end portion of the recording material is located within a range of the dot forming element array in the sub-scanning direction. By discarding a part of the ink in a hole provided locally at a position facing the end of the recording material at the position on the platen surface, there is no blank at the end of the recording material. Ink to record Recording method according jet recording apparatus. 12. The recording head according to claim 11, wherein when recording the edges of the recording material without margins, the recording head performs interlaced recording in which a part near the edges of all dot forming elements is driven for recording. When recording other recording areas, interlaced recording is performed, in which all dot forming elements are driven to perform recording. 13. A recording head having a dot forming element array in which a plurality of dot forming elements are arranged in a sub-scanning direction, and scanning a recording material facing the recording head while scanning the recording head in a main scanning direction. A platen for defining the position of the recording head; a recording material feed roller disposed upstream of the recording head; and a discharge roller disposed downstream of the recording head. A flat top surface is provided on a platen surface of a portion opposed to the dot forming element array to support the recording material by contacting the recording material from underneath, and a center is provided at a substantially central portion of the top surface in the recording material conveyance direction. A hole is provided, and the ink jet recording device is formed so as to guide the discarded ink deviated from the start or end to the center hole when the start and / or end of the recording material is recorded without blank space. Apparatus. 14. A dot forming element array in which a plurality of dot forming elements are arranged in the sub-scanning direction for a plurality of colors, and a plurality of dot forming element arrays corresponding to each color are sequentially arranged in the sub-scanning direction. A recording head that scans the recording head in the main scanning direction and, when recording on a recording material facing the recording head, a platen that defines the position of the recording head; and a platen arranged upstream of the recording head. A recording material feeding roller provided, and a discharge roller disposed downstream of the recording head, wherein the platen is provided with a sub-dot for each of the plurality of dot forming element arrays corresponding to each color. A first hole is provided in a portion of the platen facing the downstream portion in the scanning direction, and a second hole is provided in a portion of the platen facing the upstream portion in the sub-scanning direction. For each of the plurality of dot-forming element arrays, when recording the starting end of the recording material without any blank space, the ink discarded from the starting end and discarded is guided to the first hole, and the end of the recording material is blanked. An ink jet recording apparatus formed so as to guide the ink that has come off from the end and discarded to the second hole when recording without recording. 15. The standard interlaced printing method according to claim 13, wherein the recording head drives and records all the dot forming elements of the dot forming element array by a dot drive control section that drives the dot forming element array. The limited interlace printing, which is limited to the dot forming elements of the set and is driven and printed, can be switched and executed, and when the start end and the end of the recording material are located in the central hole, An ink jet recording apparatus for performing interlace recording. 16. A standard interlaced printing method according to claim 14, wherein the recording head is configured to drive and record all the dot forming elements of the dot forming element array by a dot drive control unit that drives the dot forming element array. The limited interlace printing, which is limited to the dot forming elements of the set and is driven and recorded, is configured to be able to be switched and executed, and the starting end of the recording material is set to the plurality of dot forming element arrays corresponding to each color. An ink jet recording apparatus in which the limited interlace recording is executed when the recording material is located at each of the first hole portions and when the end of the recording material is located at each of the second hole portions.