JP2005153208A - Inkjet recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a line type inkjet recording apparatus which applies overprinting of recording onto a recording medium subjected to printing by a prestage printer, and which can bring about a high-definition recorded image, without causing variations in recording size and misregistration of start of recording by variations in the velocity of the carrying of a recording medium carried from the prestage printer. <P>SOLUTION: In this line type inkjet recording apparatus 1 for performing recording on the recording medium 3 subjected to the recording by the prestage printer 2, a position detector 8 for detecting the position of the recording medium 3 to start driving a recording head 5 and a velocity detector 11 for changing a driving period of the recording head 5 by detecting the carrying velocity of the recording medium 3 are provided on an upstream side with respect to the recording head 5 in a carrying direction A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

   The present invention relates to a line-type inkjet recording apparatus in which ejection openings are arranged in the width direction of a recording medium, among inkjet recording apparatuses that perform recording by ejecting ink from a plurality of ejection openings.

  Conventionally, by ejecting ink from a discharge port provided on the nozzle surface of a recording head toward a recording medium, irradiating light from a light source to the landed ink and curing the ink, an image is recorded on the recording medium. An ink jet recording apparatus for recording the image is known.

  The ink jet recording apparatus includes a recording head having an array of ejection openings along the recording medium conveyance direction, and the recording head reciprocating and recording in the width direction of the recording medium (direction perpendicular to the recording medium conveyance direction). A serial type recording is performed by intermittently conveying the medium, and a recording head having an array of ejection openings along the width direction of the recording medium. A line type recording apparatus that performs recording with conveyance is widely known, and in particular, a line type inkjet recording apparatus is superior to the former in terms of speeding up recording and is widely used.

  In order to perform recording at high speed, the recording medium must be transported at a high speed, but a new problem arises that the recording start position and the recording size vary due to variations in the transport speed.

  In particular, the image is recorded in advance by another printing device as a pre-processing, and then the recording is overprinted by using an ink-jet recording device in the post-processing such as processing by overlapping the recording with another ink. In the case of performing, since the transport speed in the pre-processing stage is not always constant, the speed transported to the ink jet recording apparatus used in the post-processing is not constant, and this problem becomes more remarkable.

Conventionally, as in Patent Document 1, an encoder signal for detecting the position of the carriage is acquired before printing, and the recording timing of the recording head is determined by controlling the ejection position by obtaining the acceleration during scanning. It has been solved.
Japanese Patent Laid-Open No. 2003-21767

  However, since the ink jet recording apparatus of Patent Document 1 is a serial ink jet recording apparatus, recording is performed while intermittently repeating conveyance and recording of the recording medium, resulting in a slow recording speed. This is a fatal problem in the printing industry where there is a situation that cannot be achieved without satisfying the high-speed recording. On the other hand, the line-type inkjet recording apparatus widely used in the printing industry remains unsupported.

  Therefore, the present invention has been made in view of the above points, and in a line-type inkjet recording apparatus used for overprinting of recording, a recording start position due to variations in conveyance speed when conveyed to the inkjet recording apparatus. It is an object of the present invention to provide an ink jet recording apparatus capable of obtaining a high-definition recorded image without causing deviation or recording size variation.

In order to solve the above-described problem, an ink jet recording apparatus according to a first aspect of the present invention ejects ink onto a surface facing a recording medium on which recording has been performed by a preceding recording apparatus, and the ink jet recording apparatus is In an inkjet recording apparatus provided with an inkjet recording head formed by forming an ejection port having a length equivalent to the length,
A position detection device for detecting a marking position recorded on the recording medium by an end portion of the recording medium or a pre-stage recording device at a position upstream of the recording medium conveyance direction of the recording head; A control unit is provided for changing the start timing of driving of the recording head based on the detection result.

  According to the first aspect of the present invention, the marking position recorded on the recording medium by the end of the recording medium or in advance by the pre-stage recording apparatus is detected at a position upstream of the recording medium transport direction of the recording head. Since the position detection device is provided, the control unit detects the position of the recording medium based on the detection result of the position detection device, changes the start timing of driving the recording head, and changes the recording head. Can be started.

An ink jet recording apparatus according to claim 2 is provided.
In claim 1,
A speed detection device configured to detect a conveyance speed of the recording medium, and the control unit determines a drive start timing of the recording head based on the conveyance speed detected by the speed detection device and a detection result of the position detection device. It is characterized by changing.

  According to a second aspect of the present invention, a speed detection device is provided, and the control unit drives the recording head based on a conveyance speed detected by the speed detection device and a detection result of the position detection device. Since the start timing can be changed, recording can be started more accurately at an appropriate position.

An ink jet recording apparatus according to a third aspect of the present invention provides:
An ink jet recording head is provided that ejects ink onto the surface facing the recording medium on which recording has been performed by the former recording apparatus, and forms ejection openings having a length equivalent to the length in the width direction of the recording medium. In an inkjet recording apparatus,
A control that includes a speed detection device that detects a conveyance speed of the recording medium at a position upstream of the recording medium conveyance direction of the recording head, and that changes a drive cycle of the recording head based on a detection result of the speed detection device. It has the part.

  According to the third aspect of the present invention, since the recording head includes a speed detection device that detects the conveyance speed of the recording medium at a position upstream from the conveyance direction of the recording medium, the control unit includes Based on the detection result of the speed detection device, the drive cycle of the recording head can be changed.

An ink jet recording apparatus according to a fourth aspect of the present invention provides:
In claim 2 or 3,
The speed detection device includes a plurality of the position detection devices at different positions in the transport direction of the recording medium, and the control unit calculates a transport speed of the recording medium based on detection results of the plurality of position detection devices. It is characterized by doing.

  According to the fourth aspect of the present invention, since the speed detection device is a plurality of the position detection devices arranged at different positions in the conveyance direction of the recording medium, the control unit includes the plurality of position detection devices. Based on this detection result, the conveyance speed of the recording medium can be calculated.

An ink jet recording apparatus according to the invention of claim 5 is:
In any one of Claims 1-4,
At least one of the position detection device and the speed detection device is movable in the width direction of the recording medium according to the size in the width direction of the recording medium or the marking position. To do.

  According to the fifth aspect of the present invention, at least one of the position detection device and the speed detection device is configured so that the width of the recording medium depends on the size in the width direction of the recording medium or the marking position. Since it can move in the direction, the position and speed can be detected regardless of the size of the recording medium.

An ink jet recording apparatus according to the invention of claim 6 is:
In any one of Claim 1 to 5,
The recording medium is recorded by any one of letterpress printing, planographic printing, intaglio printing, gravure printing, screen printing, and flexographic printing as the preceding recording apparatus.

  According to the invention described in claim 6, the recording medium is recorded by any one of letterpress printing, planographic printing, intaglio printing, gravure printing, screen printing and flexographic printing as the preceding recording apparatus. The ink jet recording apparatus can be combined with the preceding recording apparatus so that a part of the recording is on demand.

An ink jet recording apparatus according to a seventh aspect of the present invention provides:
In any one of Claims 2 to 6,
The speed detection device is common to the speed detection device used in the preceding recording apparatus.

  According to the seventh aspect of the present invention, the speed detection device can be shared with the speed detection device used in the preceding recording apparatus.

An ink jet recording apparatus according to an eighth aspect of the present invention provides:
In any one of Claims 1-7,
The ink is an ink that is cured by irradiation with light.

  According to an eighth aspect of the present invention, the ink is an ink that cures when irradiated with light, and can be cured immediately and efficiently when irradiated with light.

  According to the first aspect of the present invention, the control unit detects the position of the recording medium based on the detection result of the position detection device, changes the start timing of driving the recording head, and drives the recording head. Since it can be started, ink can be ejected at an appropriate position according to the position of the recording medium, recording can be started, and recording can be performed appropriately. Regardless, the recording start position in the transport direction can be made constant.

  According to the second aspect of the present invention, the speed detection device is provided, and the control unit changes the drive start timing of the recording head based on not only the detection result of the position detection device but also the detected conveyance speed result. Therefore, according to the transport speed of the recording medium, it is possible to start recording by ejecting ink more accurately at an appropriate position, and to perform appropriate recording. Regardless of the variation in the conveyance speed, the recording start position in the conveyance direction can be made constant.

  According to the third aspect of the present invention, the control unit can change the drive cycle of the recording head based on the detection result of the speed detecting device, so that the recording head can be appropriately selected according to the conveyance speed of the recording medium. The recording size can be appropriately recorded without changing the recording size, and the recording size in the transport direction is made constant regardless of variations in the transport speed when transported from the preceding recording apparatus. be able to.

  According to the fourth aspect of the present invention, since the control unit can calculate the conveyance speed of the recording medium based on the detection results of the plurality of position detection devices, it appropriately drives the recording head according to the conveyance speed. Compared with the case where the recording speed is detected and the conveyance speed is detected using the speed detection device, the conveyance speed can be detected at a lower cost, and the variation in the conveyance speed when the conveyance is performed from the preceding recording apparatus. Therefore, a high-definition recorded image can be obtained.

  According to the invention described in claim 5, the control unit can move the position detection device and the speed detection device in the width direction of the recording medium in accordance with the size in the width direction of the recording medium or the marking position. Since the position and the conveyance speed of the recording medium can be detected regardless of the size of the recording medium, the control unit can detect the size of the recording medium and the variation in the conveyance speed when conveyed from the preceding recording apparatus. High-definition recorded images can be recorded.

  According to the invention described in claim 6, since the ink jet recording apparatus can be configured such that a part of the recording is combined with the preceding recording apparatus on demand, the overprinting of recording can be performed at high speed. It is possible to record a high-definition recorded image regardless of variations in the conveyance speed when conveyed from the preceding recording apparatus.

  According to the seventh aspect of the present invention, since the speed detection device can be shared with the speed detection device used in the preceding recording apparatus, the speed detecting device is provided in both the preceding recording apparatus and the ink jet recording apparatus. Compared to the case where it is mounted, a simple configuration can be obtained, and a high-definition recorded image can be obtained at a low cost regardless of variations in the conveyance speed when conveyed from the preceding recording apparatus. .

  According to the invention described in claim 8, since the ink can be cured immediately and efficiently by irradiating light or electron beam, it can be printed on various recording media and has little blur and blur. A high-definition image can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

[First embodiment]
FIG. 1 shows a schematic configuration of a first embodiment of an ink jet recording apparatus according to the present invention. The ink jet recording apparatus 1 is an apparatus that performs recording after recording on a recording medium with another recording apparatus as a pretreatment. The ink jet recording apparatus 1 includes a printing device that is a preceding recording apparatus as another recording apparatus. Device 2 is externally attached.

  The printing apparatus 2 refers to an apparatus for recording by any one of letterpress printing, planographic printing, intaglio printing, gravure printing, screen printing, and flexographic printing. In the inkjet recording apparatus 1 of the present embodiment, these printing apparatuses 2 are used. Thus, the recording medium 3 on which printing has already been performed is transported to the inkjet recording apparatus 1.

The ink jet recording apparatus 1 is provided with a discharge tray (not shown) for discharging the recording medium 3 after an image is recorded.
Inside the inkjet recording apparatus 1, a platen 4 for supporting the recording medium 3 conveyed from the printing apparatus 2 is provided.

  Further, in the inkjet recording apparatus 1, above the platen 4, several kinds of yellow (Y), magenta (M), cyan (C), and black (K) differ in order along the transport direction A. A plurality of recording heads 5, 5... Provided with nozzles (not shown) for ejecting ink toward the recording medium 3 are provided corresponding to the entire width of the platen 4. As the recording head 5, a line type is used.

  Further, on the downstream side in the transport direction A of the recording head 5 that discharges black (K) ink, the ink ejected from the recording head 5 and landed on the recording medium 3 is irradiated with light of a predetermined wavelength. Similarly to the recording head 5, an ultraviolet irradiation device 6 that cures ink is provided corresponding to the entire width of the platen 4, and an ultraviolet light source that irradiates ultraviolet rays to cure the ink inside the ultraviolet irradiation device 6 ( (Not shown). In this embodiment, as the ultraviolet light source, at least one of a low-pressure mercury lamp, a high-pressure mercury lamp, a metal halide lamp, a hot cathode tube, a cold cathode tube, an LED (Light Emitting Diode), and the like is applied.

  As described above, the inkjet recording apparatus 1 is equipped with the recording head 5 and the ultraviolet light source, which are various recording members for performing recording, and is located above the platen 4 and in the transport direction A more than the recording head 5. A position detection device 8 is provided at an upstream position. The position detection device 8 in the present embodiment includes a position detection sensor 9 and a sensor moving device 10 that is mounted with the position detection sensor 9 and reciprocates over the entire width of the recording medium 3 in a direction B orthogonal to the conveyance direction A. ing.

  A speed detection device 11 that detects the conveyance speed of the recording medium 3 is provided above the platen 4 and further upstream of the position detection sensor 9 in the conveyance direction A. Is composed of a speed detection sensor 12 and a sensor moving device 10 that is mounted with the speed detection sensor 12 and reciprocates across the entire width of the recording medium 3 in a direction B orthogonal to the transport direction A.

  Next, a control configuration in the ink jet recording apparatus of the present embodiment will be described with reference to FIG. In the present embodiment, the inkjet recording apparatus 1 is provided with a transport motor 4 that transports the recording medium 3, a recording head 5, and a control unit 13 that controls the ultraviolet light source, as shown in FIG.

  The control unit 13 is configured to control the ultraviolet light source so as to generate ultraviolet light from the ultraviolet light source of the ultraviolet irradiation device 6. Further, ink ejection is controlled by controlling the recording head 5 based on predetermined image information.

  Furthermore, a position detection sensor 9 constituting the position detection device 8, a speed detection sensor 12 constituting the speed detection device 11, and a sensor moving device 10 for moving these sensors are connected to the control unit 13. The control unit 13 inputs a detection signal of the conveyance speed of the recording medium 3 in the speed detection sensor 12, changes the drive cycle of the recording head 5 based on the detection result, and detects the passage timing in the position detection sensor 9. A signal is input, the driving start timing of the recording head 5 is determined based on the detection result, and the driving of the recording head 5 is started.

  Specifically, the sensor moving device 10 is moved across the entire width of the recording medium 3 in the direction B orthogonal to the conveying direction A, the conveying speed of the recording medium 3 is detected by the speed detection sensor 12, and the recording medium 3 is conveyed. The position perpendicular to the direction A or the marking position previously recorded on the recording medium 3 is detected by the position detection sensor 9 and the drive cycle of the recording head 5 is changed according to the detection result of the speed detection sensor 12. In addition, the drive start timing of the recording head 5 is changed according to the detection results of the speed detection sensor 12 and the position detection sensor 9, and the drive of the recording head 5 is started according to the detection result of the position detection sensor 9. It has become.

  Next, the operation of the inkjet recording apparatus 1 of the present embodiment will be described.

  When the printing apparatus 2 performs the first recording on the recording medium 3, predetermined image information is sent to the inkjet recording apparatus 1, and the printing apparatus 2 transports the recording medium 3 on which the image is recorded to the inkjet recording apparatus 1. To do.

  When the leading end of the recording medium 3 reaches the platen 4, the control unit 13 operates the sensor moving device 10 on which the speed detection sensor 12 is mounted, and a predetermined position where the speed detection sensor 12 faces the recording medium 3. Move to.

  When the recording medium 3 is sent to the position of the speed detection sensor 12, the speed detection sensor 12 detects the speed of the recording medium 3, outputs a detection value to the control unit 13, and the control unit 13 based on the detection value. The drive cycle of the recording head 5 is changed. And the control part 13 continues and operates the sensor moving apparatus 10 carrying the position detection sensor 9. FIG.

  When the recording medium 3 is sent to the position of the position detection sensor 9, the position detection sensor 9 detects an end portion orthogonal to the conveyance direction A of the recording medium 3 or a marking position previously recorded on the recording medium 3, and a control unit A detection signal is output to 13, and the control unit 13 determines a timing for driving the recording head 5 based on the detection signal, and outputs a drive start signal to the recording head 5. Based on the output drive start signal, the recording head 5 starts driving.

  Ink is ejected from the recording head 5 onto the recording medium 3, and thereafter, the ink ejected from the ultraviolet light source onto the recording medium 3 is irradiated with ultraviolet rays, so that the ink is cured. Thereafter, the leading end of the recording medium 3 is separated from the platen 4, and the recording medium 3 is discharged to the discharge tray.

  Note that the speed detection device 11 in this case may be the same as the speed detection device for detecting the speed in the printing device 2 used in the pre-process printing process.

  As the recording medium 3, a cut sheet-like recording medium made of various papers such as plain paper, recycled paper, glossy paper, various fabrics, various non-woven fabrics, resin, metal, glass and the like is applicable.

  In the present embodiment, ink that is cured by irradiation with ultraviolet rays is used. However, the present invention is not necessarily limited to this, and it may be cured by irradiation with light other than ultraviolet rays. Here, “light” is light in a broad sense, and includes electromagnetic waves such as ultraviolet rays, electron beams, X-rays, visible rays, and infrared rays. That is, the ink used in the present embodiment is applied with a polymerizable compound that is polymerized and cured with light other than ultraviolet light and a photoinitiator that initiates a polymerization reaction between the polymerizable compounds with light other than ultraviolet light. Also good. When using a light curable ink that is cured by light other than ultraviolet light, a light source that emits the light must be applied instead of the ultraviolet light source.

  As described above, in the inkjet recording apparatus 1 according to the first embodiment in which printing is performed in combination with another recording apparatus as a pretreatment, the inkjet recording apparatus 1 is located above the platen 4 and in the transport direction A. By providing the speed detection sensor 12 and the position detection sensor 9 on the upstream side of the recording head 5, the conveyance speed and position of the recording medium 3 are detected, and the control unit starts driving the recording head 5 according to the conveyance speed. Since the driving of the recording head 5 can be started in accordance with the position while changing the timing and the driving cycle of the recording head 5, the recording at the appropriate position of the recording head 5 can be started and the appropriate driving state can be maintained. The recording start position shift and the recording size variation are caused by the variation in the conveying speed when the ink is conveyed to the inkjet recording apparatus 1. Without, it is possible to obtain a high-resolution recorded image.

  Further, since the speed detecting device 11 can be used also as the speed detecting device used in the printing apparatus 2, the cost can be reduced through the entire apparatus used for a series of recording operations from the printing apparatus 2 to the ink jet recording apparatus. Therefore, it is possible to obtain a high-definition recorded image corresponding to the problems associated with the overprinting of the above-mentioned recording with the minimum necessary members.

  The printing apparatus 2 is an apparatus that records by any one of letterpress printing, planographic printing, intaglio printing, gravure printing, screen printing, and flexographic printing, and the inkjet recording apparatus according to the present embodiment preprocesses these apparatuses. Therefore, recording can be performed at a higher speed than when recording is performed by a line type inkjet recording apparatus alone.

[Second Embodiment]
Next, a second embodiment of the ink jet recording apparatus according to the present invention will be described with reference to FIGS. However, in the second embodiment, a position detection device is used instead of the speed detection device in the first embodiment, and other configurations are the same as those in the first embodiment. The components are denoted by the same reference numerals, and detailed description thereof is omitted. In the second embodiment, description will be made centering on the position detection device.

  As shown in FIG. 3, above the ink jet recording apparatus 14, as in the first embodiment, ultraviolet irradiation including a recording head 5 which is various recording members for recording and an ultraviolet light source (not shown). The apparatus 6 is mounted, and two position detection apparatuses 15 and 16 are provided at a position upstream of the recording head 5 in the transport direction A.

  The position detection device 15 includes a position detection sensor 17 and a sensor moving device 10 that is mounted with the position detection sensor 17 and reciprocates across the entire width of the recording medium 3 in a direction B orthogonal to the conveyance direction A. A position detection device 16 is provided at a position further upstream than the position detection device 15 in the direction A. The position detection device 16 includes the position detection sensor 18 and the position detection sensor 18 and is orthogonal to the conveyance direction A. The sensor moving device 10 is configured to reciprocate over the entire width of the recording medium 3.

  Next, a control configuration in the inkjet recording apparatus 14 of the present embodiment will be described with reference to FIG. Also in the present embodiment, as in the first example, the inkjet recording apparatus 14 is provided with a control unit 19 that controls the recording head 5 and the ultraviolet light source, as shown in FIG.

  Moreover, the control part 19 controls an ultraviolet light source so that an ultraviolet-ray may be generated from the ultraviolet irradiation device 6. FIG. Further, ink ejection is controlled by controlling the recording head 5 based on predetermined image information.

  Furthermore, the position detection sensors 17 and 18 which are the position detection devices 15 and 16 and the sensor moving device 10 are connected to the control unit 19, and the control unit 19 detects the passage timing in each of the position detection sensors 17 and 18. In addition to inputting a signal, the drive start timing of the recording head 5 is determined based on the detection signals of the position detection sensors 17 and 18, and the speed of the recording medium 3 is calculated to change the drive start timing. It has become.

  Specifically, the sensor moving device 10 is moved across the entire width of the recording medium 3 in the direction B perpendicular to the transport direction A, and the position of the marking recorded on the end of the recording medium 3 or the recording medium 3 in advance is detected. It is detected by the sensor 17, and the drive start timing of the recording head 5 is changed according to the result detected by the position detection sensor 17 and is detected by the position detection sensors 17 and 18. According to the result, the distance between the position detection sensor 18 and the position detection sensor 17 / the time taken from passing through the position detection sensor 17 to passing through the position detection sensor 17 is calculated. The conveyance speed of the recording medium 3 corresponding to the detection result is calculated, and the drive cycle of the recording head 5 is changed based on the conveyance speed.

  Next, the operation of the ink jet recording apparatus 14 of the present embodiment will be described.

  When the printing apparatus 2 performs the first recording on the recording medium 3, predetermined image information is sent to the inkjet recording apparatus 14, and the printing apparatus 2 conveys the recording medium 3 on which the image is recorded to the inkjet recording apparatus 14. .

  When the leading end of the recording medium 3 reaches the platen 4, the control unit 19 activates the sensor moving device 10 on which the position detection sensor 18 is mounted, and a predetermined position facing the position detection sensor 18 on the recording medium 3. Move to.

  When the recording medium 3 is sent to the position of the position detection sensor 18, the control unit 19 activates the position sensor 18, and the position detection sensor 18 is connected to the end of the recording medium 3 orthogonal to the conveyance direction A or in advance. Is detected, and a detection signal is output to the control unit 19. Based on the detection signal, the control unit 19 determines the timing for driving the recording head 5 and changes the driving start timing.

  After that, when the recording medium 3 is sent to the position of the position detection sensor 17, the position sensor 17 detects the passage timing at the end portion orthogonal to the conveyance direction A of the recording medium 3 or the marking position previously recorded on the recording medium 3. The detection signal is output to the control unit 19. The control unit 19 determines the timing for driving the recording head 5 based on the detection signal, changes the driving start timing, and stores the distance between the position sensors 17 and 18 stored in advance and the position sensors. The transport speed of the recording medium 3 is calculated from the time required to pass through the position sensors 17 and 18 detected by the sensors 17 and 18, and the control unit 19 changes the drive cycle of the recording head 5 based on the result. To do.

  Thereafter, the control unit 19 outputs a drive start signal to the recording head 5, and the recording head 5 starts driving based on the output drive start signal.

  Ink is ejected from the recording head 5 onto the recording medium 3, and thereafter, the ink ejected from the ultraviolet light source onto the recording medium 3 is irradiated with ultraviolet rays, and the ink is cured. Thereafter, the leading end of the recording medium 3 is separated from the platen 4, and the recording medium 3 is discharged to the discharge tray.

  Here, the printing device 2, the recording medium 3, the ink, and the ultraviolet light source for curing the ink are the same as those in the first embodiment.

  As described above, in the inkjet recording apparatus 14 according to the second embodiment in which the printing is performed in combination with the printing apparatus 2 as a pre-processing, the recording is performed above the platen 4 and in the conveyance direction A. By providing the position detection sensor 18 and the position detection sensor 17 on the upstream side of the head 5, the conveyance speed and position of the recording medium 3 are detected, and the control unit 19 starts driving the recording head 5 according to the conveyance speed. Since the driving of the recording head 5 can be started in accordance with the position while changing the timing and the driving cycle of the recording head 5, the recording at the appropriate position of the recording head 5 can be started and the appropriate driving state can be maintained. The recording start position deviation and the recording size variation due to the variation in the transport speed when transported to the inkjet recording device 14 can be maintained. Without the time difference, it is possible to obtain a high-definition recorded image.

  At this time, since a plurality of position detection devices can be used instead of the speed detection device, the inkjet recording device 14 can be used for overprinting the above-described recording with the minimum necessary members without cost. In response to the problems involved, a high-definition recorded image can be obtained.

  In the present embodiment, the position detection device that determines the timing for driving the recording head 5 is the position detection device 15. However, the position detection device 16 may be upstream of the position detection sensor 15 in the transport direction A. It may be detected by both the position detection devices 15 and 16.

  Further, in the present embodiment, the position detection apparatus and the speed detection apparatus are configured with a plurality of position detection apparatuses or with a position detection apparatus and a speed detection apparatus. Although the example which detects a speed | velocity was mentioned above, you may provide the position detection apparatus and the speed detection apparatus independently.

1 is a schematic configuration diagram of an ink jet recording apparatus 1 and a printing apparatus 2 in a first embodiment. It is a control block diagram of the inkjet recording device 1 in 1st embodiment. It is a schematic block diagram of the inkjet recording device 14 and the printing apparatus 2 in 2nd embodiment. It is a control block diagram of the inkjet recording device 14 in 2nd embodiment.

Explanation of symbols

3 Recording medium 5 Recording head 8, 15, 16 Position detector 11 Speed detector

Claims (8)

An ink jet recording head is provided that ejects ink onto a surface facing a recording medium on which recording has been performed by a preceding recording apparatus, and forms an ejection port having a length equivalent to the length in the width direction of the recording medium. In the inkjet recording apparatus,
A position detection device for detecting a marking position recorded on the recording medium by an end portion of the recording medium or a pre-stage recording device at a position upstream of the recording medium conveyance direction of the recording head; An ink jet recording apparatus comprising: a control unit that changes a start timing of driving of the recording head based on a detection result.   A speed detection device configured to detect a conveyance speed of the recording medium, and the control unit determines a drive start timing of the recording head based on the conveyance speed detected by the speed detection device and a detection result of the position detection device. The inkjet recording apparatus according to claim 1, wherein the inkjet recording apparatus is changed. An ink jet recording head is provided that ejects ink onto the surface facing the recording medium on which recording has been performed by the former recording apparatus, and forms ejection openings having a length equivalent to the length in the width direction of the recording medium. In an inkjet recording apparatus,
A control that includes a speed detection device that detects a conveyance speed of the recording medium at a position upstream of the recording medium conveyance direction of the recording head, and that changes a drive cycle of the recording head based on a detection result of the speed detection device. An ink jet recording apparatus comprising a unit.   The speed detection device includes a plurality of the position detection devices at different positions in the transport direction of the recording medium, and the control unit calculates a transport speed of the recording medium based on detection results of the plurality of position detection devices. The ink jet recording apparatus according to claim 2, wherein the ink jet recording apparatus is an ink jet recording apparatus.   At least one of the position detection device and the speed detection device is movable in the width direction of the recording medium according to the size in the width direction of the recording medium or the marking position. The inkjet recording apparatus according to any one of claims 1 to 4.   6. The recording medium according to claim 1, wherein the recording medium is recorded by any one of letterpress printing, planographic printing, intaglio printing, gravure printing, screen printing, and flexographic printing as the pre-stage recording apparatus. The ink jet recording apparatus according to any one of claims.   The ink jet recording apparatus according to any one of claims 2 to 6, wherein the speed detecting apparatus is common to a speed detecting apparatus used for the preceding recording apparatus.   The ink jet recording apparatus according to claim 1, wherein the ink is an ink that is cured by irradiation with light.

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