JP2011183590A - Inkjet recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording apparatus capable of precisely printing at a right angle with respect to an extending direction of a work. <P>SOLUTION: The inkjet recording apparatus 1 is such an inkjet recording apparatus 1 that prints a work W by driving an inkjet head 51 while the inkjet head 51 is moved relatively in the main scanning direction and in the sub-scanning direction with respect to the work W which is removed and fed by a reel-to-reel style. The inkjet recording apparatus includes: an X-axis table 7 having a sub-scanning moving axis for relatively moving the work W in the sub-scanning direction with respect to the inkjet head 51; a Y-axis table 8 having a main scanning moving axis for relatively moving the inkjet head 51 in the main scanning direction with respect to the work W; and a head axis rotating mechanism 10 for finely rotating the main scanning moving axis in a plane in parallel to the work W. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an inkjet recording apparatus that performs printing on a workpiece supplied in a reel-to-reel format.

2. Description of the Related Art Conventionally, as this type of recording apparatus (inkjet recording apparatus), an apparatus that performs printing by an inkjet method on a workpiece to be supplied and discharged in a so-called reel-to-reel format is known (see Patent Document 1).
This recording apparatus includes a feeding device for feeding a long recording medium wound around a rotating body, a winding device for winding a printed recording medium around the rotating body, and a recording medium (workpiece) fed from the rotating body. ), A plurality of recording heads (inkjet heads) that perform printing, an acquisition unit that acquires information about the skew angle of the recording medium with respect to the transport direction, and a correction that controls the ejection timing of the recording head based on the acquired skew information. Means.
In this case, the skew angle of the recording medium fed by the feeding device is acquired by the acquisition unit, and based on the acquired information, the ejection timing is corrected and the drawing process is performed by the recording head. Then, the processed recording medium is sequentially wound by a winding device.

JP 2008-155628 A

  However, in such a recording apparatus, although the margin in the width direction of the inclined recording medium, that is, the print start position and the print end position in the width direction of the recording medium can be accurately printed by timing correction, In particular, there is a problem that printing is performed obliquely with respect to the recording medium by an inclination angle of the recording medium. In particular, when a label image is continuously printed and the recording medium after printing is cut into a label, the image is inclined.

  An object of the present invention is to provide an ink jet recording apparatus capable of printing with high accuracy at right angles to the extending direction of a workpiece.

  The ink jet recording apparatus of the present invention drives an ink jet head to a work while moving the ink jet head relative to the work that has been discharged in a reel-to-reel format relative to the main scanning direction and the sub scanning direction. An inkjet recording apparatus that performs printing, and includes a work stage on which a supplied work is set, and a sub-scanning movement axis that relatively moves the work set on the ink-jet head and the work stage in the sub-scanning direction. A main scanning movement table having a main scanning movement axis that relatively moves the work set on the inkjet head and the work stage in the main scanning direction, and the main scanning movement axis in a plane parallel to the work And a main-scanning-side rotating means for minutely rotating.

  In this case, it is preferable that the sub-scanning movement axis moves the work in the sub-scanning direction with respect to the ink jet head, and the main scanning movement axis moves the ink-jet head in the main scanning direction with respect to the work.

  According to these configurations, since the main scanning movement axis for moving the inkjet head in the main scanning direction can be finely rotated in a plane parallel to the workpiece by the main scanning side rotating means, the workpiece on the workpiece stage is Even if it is slightly tilted with respect to the sub-scanning movement axis, the angle of the main scanning movement axis can be adjusted at right angles to the workpiece (in the extending direction). Thereby, it is possible to perform printing accurately with a right angle (row direction or column direction) with respect to the extending direction of the workpiece. The printing in the extending direction of the inclined work is preferably adjusted (corrected) at the ejection timing of the inkjet head.

  In this case, the center line of the workpiece is detected based on the detection result of the detecting means for detecting the angular deviation of the center line in the sub-scanning direction of the workpiece set on the sub-scanning movement table with respect to the axis line of the sub-scanning movement axis. It is preferable to further comprise control means for controlling the main scanning side rotation means so that the axis of the main scanning movement axis is orthogonal to the main scanning movement axis.

  According to this configuration, the operation of adjusting the angle of the main scanning movement axis at a right angle to the extending direction of the workpiece can be performed automatically and in real time.

  In this case, the main scanning side rotation means has a pair of shaft moving mechanisms that support both end portions of the main scanning moving shaft, and each axis moving mechanism has the shaft end portions in the X-axis direction, the Y-axis direction, and It is preferable that the table is composed of an X, Y, and θ table that is slightly moved in the θ direction.

  According to this configuration, the main scanning movement axis can be finely rotated and the main scanning movement axis can be finely rotated without disposing the main scanning side rotation means at the center position of the main scanning movement axis. Thus, the main scanning movement axis can be stably supported by both ends. Further, the main scanning movement axis can be translated in the sub-scanning direction, and the position of the inkjet head in the sub-scanning direction can be adjusted.

  In this case, it is preferable to further include sub-scanning side rotating means for supporting the work stage and rotating the work stage minutely in a plane parallel to the work.

  Further, it is preferable that the control means further controls the sub-scanning side rotation means based on the detection result of the detection means so that the axis of the sub-scanning movement axis is parallel to the center line of the workpiece.

  According to these configurations, even if the work on the work stage is slightly tilted with respect to the sub-scanning movement axis, the sub-scanning movement axis is angled in parallel with the work (extension direction) by the sub-scanning side rotation means. Can be adjusted. Thereby, it is possible to perform printing accurately in parallel (row direction or column direction) with respect to the extending direction of the workpiece. In other words, printing can be performed with high accuracy at right angles and parallel to the extending direction of the workpiece.

(A) of an inkjet recording device is a top view, (b) is a side view. It is a perspective view of an inkjet head. (A) around the head axis rotation mechanism is a plan view, and (b) is a side view. It is explanatory drawing about the angle adjustment method of a main scanning movement axis.

  Hereinafter, an inkjet recording apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. This inkjet recording apparatus discharges a desired image or the like by ejecting, for example, ultraviolet curable ink (UV ink) to a thin film workpiece to be discharged in a so-called reel-to-reel format by an inkjet head. It is something to print. In the following description, the feed direction of the workpiece (longitudinal direction of the workpiece) is the X-axis direction, the direction orthogonal to the X-axis direction (moving direction of the inkjet head) is the Y-axis direction, and in a plane parallel to the workpiece The rotation direction at is the θ direction.

  As shown in FIG. 1, the inkjet recording apparatus 1 includes a machine base 2, a feeding device 3 that feeds out a long workpiece W wound in a roll shape, and a winding device 4 that winds up a printed workpiece W. A work stage 5 disposed on the machine base 2 for sucking and setting the supplied work W, a stage rotating mechanism (sub-scanning side rotating means) 6 for rotating the work stage 5 in the θ direction, and an X axis X-axis table (sub-scanning movement table) 7 that extends in the direction and intermittently feeds the workpiece W in the X-axis direction via the stage rotation mechanism 6 and the work stage 5, and the Y-axis direction so as to straddle the X-axis table 7 And a plurality of inkjet heads 51 that print ink on the workpiece W by discharging ink, and a plurality of inkjet heads 51 that are movably mounted on the Y-axis table 8. Carriage unit 9, has a very small head axis rotating mechanism for rotating (main scanning side rotating means) 10 in the main scanning shaft carriage unit 9 moves axis in the work W parallel to the plane of a.

  In the ink jet recording apparatus 1, after the work W fed by the feeding apparatus 3 is attracted by the work stage 5, the work W is intermittently fed (sub-scanned) in the X-axis direction by the X-axis table 7 and the carriage unit 9 is moved. Printing is performed by ejecting ink from the inkjet head 51 while reciprocating (main scanning). In addition, while printing is performed on a printing area corresponding to the size of the work stage 5, the work W is sequentially fed by the feeding device 3 and the winding device 4, and is sequentially wound. The workpiece W is fed in a state bent vertically so as to form a buffer between a later-described delivery reel 21 and the workpiece stage 5 and between the workpiece stage 5 and a later-described take-up reel 25.

  Further, the inkjet recording apparatus 1 includes a maintenance unit 11 including a suction unit 14 for forcibly discharging ink from the inkjet head 51, a wiping unit 15 for wiping the nozzle surface 57 after suction, and an extending direction of the work stage 5. A detecting device (detecting means) 12 for detecting an angular deviation (diagonal set) of the workpiece W with respect to the control device 13 and a control device 13 for controlling these devices in an integrated manner. The maintenance device 11 is disposed in a maintenance area that is deviated in the Y-axis direction from the printing area where the X-axis table 7 and the Y-axis table 8 intersect, and performs maintenance of the inkjet head 51 facing the maintenance area.

  The feeding device 3 is disposed upstream of the machine base 2 in the feed direction (X-axis direction) of the workpiece W. The feeding device 3 includes a feeding reel 21 that winds the workpiece W in a roll shape, a feeding motor 22 that feeds and rotates the feeding reel 21, and a feeding roller that feeds the workpiece W fed from the feeding reel 21 to the workpiece stage 5. 23 and a feeding-side work buffer 24 disposed between the feeding reel 21 and the feeding roller 23. The feeding roller 23 is composed of a nip roller attached to the end of the work stage 5, and feeds the work W kept in the feeding-side work buffer 24 by one image area. The feeding-side work buffer 24 has a mechanism for bending the work W in a “V” shape in the vertical direction and applying a light back tension to the work W. This back tension mechanism always reduces the back tension to such an extent that it allows bending of the workpiece W in the width direction when adjusting the angle of the workpiece stage 5 to be described later, in addition to constantly applying the back tension to the workpiece W. It has become.

  The length of the workpiece W kept in the feeding-side workpiece buffer 24 is a length obtained by adding the length of one image area and the moving distance of the workpiece stage 5 to the distance between the feeding reel 21 and the feeding roller 23. It is set above. That is, the feeding-side work buffer 24 is provided with a pair of upper and lower sensors (not shown) for detecting the position of the lower bent portion of the work W so that the length of the work W can be maintained. The feeding motor 22 is driven by detecting this, and the feeding motor 22 is stopped by detecting the lower limit side sensor. Thereby, it is possible to feed a necessary amount of workpieces W without being affected by the roll diameter of the feeding reel 21.

  The winding device 4 is disposed downstream of the machine base 2 in the feed direction of the workpiece W (X-axis direction). The winding device 4 has a winding reel 25 for winding the workpiece W in a roll shape, a winding motor 26 for winding and rotating the winding reel 25, and a printed workpiece W from the workpiece stage 5 on the winding reel 25. A feed roller 27 that feeds out, and a take-up work buffer 28 disposed between the take-up reel 25 and the feed roller 27 are provided. The feed roller 27 is composed of a nip roller attached to the end of the work stage 5 and rotates in synchronization with the feed roller 23 to feed the work from the work stage 5 by one image area. . The winding-side work buffer 28 has a mechanism for bending the work W in a “V” shape in the vertical direction and applying a light forward tension to the work W. Similarly to the above, this forward tension mechanism can reduce the forward tension to such an extent that the workpiece W can be bent in the width direction when the angle of the workpiece stage 5 described later is adjusted.

  The length of the workpiece W kept in the winding-side workpiece buffer 28 is obtained by adding the length of one image area and the moving distance of the workpiece stage 5 to the distance between the winding reel 25 and the feeding roller 27. It is set longer than the length. That is, the winding side work buffer 28 is provided with a pair of upper and lower sensors (not shown) for detecting the position of the lower bent portion of the work W so that the length of the work W can be maintained. The winding motor 26 is driven by the detection of this, and the winding motor 26 is stopped by the detection of the upper limit side sensor. Thereby, it is possible to wind up a necessary amount of the workpiece W without being affected by the roll diameter of the take-up reel 25.

  The work stage 5 has a plurality of suction holes (not shown) formed on the surface (set surface), and sucks the work W sent from the feeding device 3. The workpiece stage 5 is intermittently fed in the X-axis direction (upstream to downstream) by the X-axis table 7 (sub-scanning) while the workpiece W is attracted. Then, when reaching the downstream end position (drawing end position) where drawing for one image area is completed, the suction of the work W is released, and after the nip state of the feeding roller 23 and the sending roller 27 is released, X The shaft table 7 returns to the upstream end position (drawing start position).

  The stage rotation mechanism 6 supports the work stage 5 from the lower surface, and slightly rotates the work stage 5 in the θ direction in a plane parallel to the set surface of the work W. Specifically, the stage when the center line of the workpiece W on the workpiece stage 5 is inclined with respect to the sub-scanning movement axis described later, that is, when the workpiece introduced onto the workpiece stage 5 is inclined and sucked. The rotation mechanism 6 slightly rotates (angle adjustment) the work stage 5 so that the center line of the work W is parallel to the axis of the sub-scanning movement axis.

  The X-axis table 7 is arranged on the machine base 2 and supports the work stage 5 slidably in the X-axis direction via a pair of X-axis guide rails 31 extending in the X-axis direction and the stage rotating mechanism 6. A motor-driven X-axis slider 32. The X-axis table 7 stops when the inkjet head 51 moves forward (or backward), and feeds the workpiece W to the downstream side in the X-axis direction by the printing width until the next backward movement (or backward movement). That is, the X-axis table 7 intermittently feeds (sub-scans) the workpiece W in parallel with the reciprocating motion (main scanning) of the inkjet head 51. The sub-scanning movement axis referred to in the claims includes a pair of X-axis guide rails 31 and an X-axis slider 32. The drive system is preferably composed of a linear motor, a motor, a lead screw mechanism, and the like.

  The Y-axis table 8 includes a gate-shaped base frame 33 that extends across the machine base 2 in the Y-axis direction, and a pair of Y-axis guides that are disposed on the base frame 33 and extend in the Y-axis direction. A rail 34, a bridge plate 35 on which a plurality of carriage units 9 are suspended, and a motor-driven Y-axis slider 36 that slidably supports the bridge plate 35 in the Y-axis direction are provided. The Y-axis table 8 reciprocates the ink-jet head 51 in the Y-axis direction during printing via each carriage unit 9 and causes the ink-jet head 51 to face the maintenance device 11. The main scanning movement axis described in the claims is composed of a pair of Y-axis guide rails 34 and a Y-axis slider 36. In this case as well, the drive system is preferably composed of a linear motor, a motor, a lead screw mechanism, and the like.

  The base frame 33 is a pair of frames that support the frame-shaped frame 37 with both ends supported by a frame-shaped frame 37 that is a four-frame framework of a pair of Y-axis frames 39 and a pair of connecting frames 40 and a pair of shaft moving mechanisms 61 that will be described later. The support base 38 is provided. The pair of Y-axis frames 39 are laid in parallel in the Y-axis direction, and a pair of Y-axis guide rails 34 are provided on the upper surface thereof. Further, the detection device 12 is supported on the pair of Y-axis frames 39 (see FIG. 3).

  The detection device 12 includes an upstream imaging camera 41 that recognizes an image of an upstream edge of the workpiece W on the workpiece stage 5, and a downstream imaging that recognizes an image of the downstream edge of the workpiece W in the workpiece stage 5. And a camera 42. The two imaging results separated by the upstream imaging camera 41 and the downstream imaging camera 42 are sent to the control device 13, and the tilt angle of the workpiece W with respect to the axis line of the sub-scanning movement axis is calculated. Prior to the actual printing, a straight line may be printed on the blank portion of the work W (the portion that will eventually become unnecessary), and the printing result may be captured by the upstream imaging camera 41 and the downstream imaging camera 42. .

  Each carriage unit 9 includes a carriage body 43 that is suspended from the bridge plate 35, and a head unit 44 that is suspended from the carriage body 43 and includes a plurality of inkjet heads 51. The carriage main body 43 incorporates a mechanism for correcting the head unit 44 by θ correction (θ rotation). The head unit 44 is configured by mounting a plurality of inkjet heads 51 on a head plate (not shown), and a pair of ultraviolet lamps 45 are mounted on both ends of the head plate in the Y-axis direction.

  As shown in FIG. 2, the inkjet head 51 is a so-called two-unit type, and an ink introduction part 52 having two connection needles 55, a two-head head substrate 53 continuous with the ink introduction part 52, and an ink introduction. And a head main body 54 which is connected to the lower part of the section 52 and has an in-head flow path filled with ink. The head body 54 includes a cavity (piezoelectric element) and a nozzle plate 58 having a nozzle surface 57 in which a large number of ejection nozzles 56 are opened. When the inkjet head 51 is driven to discharge (a voltage is applied to the piezoelectric element), ink droplets are discharged from the discharge nozzle 56 by the pumping action of the cavity. The nozzle surface 57 is formed with two nozzle rows 59 composed of a large number of ejection nozzles 56 in parallel with each other.

  The ink is so-called ultraviolet curable ink, and the ultraviolet lamp 45 is constituted by an LED or the like. In the embodiment, the pair of ultraviolet lamps 45 are turned on in synchronization with the main scanning of the inkjet head 51, and the ultraviolet curable ink landed on the work W is cured and fixed. The pair of ultraviolet lamps 45 may be alternately turned on in response to the reciprocation (main scanning) of the inkjet head 51. That is, during the forward movement, one ultraviolet lamp 45 on the side that follows the inkjet head 51 is turned on, and when the backward movement is performed, the other ultraviolet lamp 45 on the side that follows the inkjet head 51 is turned on.

  Next, the head shaft rotating mechanism 10 will be described with reference to FIG. The head axis rotation mechanism 10 slightly rotates the main scanning movement axis in the θ direction in a plane parallel to the workpiece W. Specifically, the stage rotation mechanism 6 is configured to have a pair of frames via a frame-shaped frame 37 so that the center line of the workpiece W is perpendicular to the axis of the main scanning movement axis (a pair of Y-axis guide rails 34). The Y-axis guide rail 34 is slightly rotated (angle adjustment).

  The head shaft rotating mechanism 10 is a portion of the pair of connecting frames 40, and is configured by a pair of shaft moving mechanisms 61 that support the frame-shaped frame 37 from the lower side with both ends. Each axis moving mechanism 61, 61 moves the X, Y, θ slide mechanism (X, Y, θ table) 62 fixed on the support base 38 and the end of the frame frame 37 in the X axis direction. And a motor-driven frame moving mechanism 63. The X, Y, θ slide mechanism 62 is rotatably supported on the X axis slide mechanism 64 fixed on the support base 38, the Y axis slide mechanism 65 mounted on the X axis slide mechanism 64, and the Y axis slide mechanism 65. A pin-shaped θ mechanism 66 is provided, and a frame-like frame 37 is fixed to the upper end portion of the θ mechanism 66.

  For example, when tilting the frame-shaped frame 37 by moving the other end in the X-axis direction around one end, the other end of the frame-shaped frame 37 is moved in the X-axis by the frame moving mechanism 63. As a result, one end of the frame-shaped frame 37 and the θ mechanism 66 rotate relative to each other while the θ mechanism 66 (one end) moves circularly around the other end. Further, the X-axis slide mechanism 64 slides by a component in the X-axis direction of this circular motion, and the Y-axis slide mechanism 65 slides by a component in the Y-axis direction. In this way, the frame-shaped frame 37 is slightly rotated, and a minute rotation (angle adjustment) of the pair of Y-axis guide rails 34 (main scanning movement axes) fixed to the frame-shaped frame 37 is performed.

  The frame moving mechanism 63 includes an adjustment motor 71 provided on the support base 38, a ball screw (lead screw) 72 connected to the main shaft of the adjustment motor 71, and a ball nut portion 74 into which the ball screw 72 is screwed. And an operating arm 73 having a long hole 75 with which the θ mechanism 66 engages at the other end. The ball nut portion 74 is supported by a guide (not shown) so as to be slidable in the X-axis direction, and the long hole 75 is formed long in the Y-axis direction. When the adjusting motor 71 rotates forward and backward, the operating arm 73 is translated in the X-axis direction by the screw mechanism including the ball screw 72 and the ball nut portion 74, and the end portion of the frame-shaped frame 37 is moved through the θ mechanism 66 to the X-direction. Move in the axial direction. As described above, the X / Y / θ slide mechanism 62 and the frame moving mechanism 63 cooperate to adjust the angle of the pair of Y-axis guide rails 34 (main scanning movement axes) via the frame-shaped frame 37. .

  Next, a method of adjusting the angle of the main scanning movement axis by the head axis rotation mechanism 10 will be described with reference to FIG. As shown in FIG. 4A, a case is assumed in which the work W is introduced (and sucked) to the work stage 5 in a skewed state by the feeding device 3 and the winding device 4. In a state where the workpiece W is attracted to the workpiece stage 5, in cooperation with the detection device 12 and the control device 13, how much the center line of the workpiece W is shifted from a right angle with respect to the main scanning movement axis (clockwise minute). Detects whether the rotation is misaligned. Based on this detection result (deviation amount data), for example, the control device 13 stops the shaft movement mechanism 61 on one side (lower side in the figure) of the head shaft rotation mechanism 10 and moves the other (upper side in the figure) axis. The mechanism 61 is driven, and the main scanning movement axis is rotated clockwise so that the center line of the workpiece W is perpendicular to the main scanning movement axis (see FIG. 4B). More preferably, the two-axis moving mechanism 61 is driven in the opposite direction to rotate the main scanning movement axis clockwise. When adjusting the print start position in the X-axis direction, the both-axis moving mechanism 61 can be driven in the same reverse direction to move the main scanning movement axis in parallel.

  Thus, by adjusting the main scanning movement axis at a right angle with respect to the workpiece W set on the workpiece stage 5 in an inclined state, the printing row direction (in the case of horizontal writing) is set in the extending direction of the workpiece W. It becomes a right angle. However, if the center of the workpiece W on the workpiece stage 5 and the rotation center of the main scanning movement axis do not match, the position of the inkjet head 51 and the position in the width direction of the workpiece W are shifted by the right angle adjustment, and the above-mentioned There is a possibility that the printing start position will be misaligned. The former positional deviation is eliminated by correcting the ejection timing of the inkjet head 51 based on the above-described deviation amount data, and the latter positional deviation is eliminated by the parallel movement of the main scanning movement axis based on the deviation amount data ( (Can also be eliminated with X-axis table 7).

  On the other hand, in the present embodiment, the former positional deviation and the latter positional deviation can be reduced as much as possible. That is, the control device 13 drives the stage rotation mechanism 6 from the state shown in FIG. 4B based on the deviation data, and the center line of the workpiece W is parallel to the axis line of the sub-scanning movement axis. In this manner, the work stage 5 is rotated counterclockwise (see FIG. 4C). Needless to say, prior to the rotation of the work stage 5, the control device 13 performs control so as to weaken the work tension in the feeding side work buffer 24 and the take-up side work buffer 28. In the adjustment by the stage rotation mechanism 6, immediately after the printing on the workpiece W is completed, the workpiece stage 5 is automatically returned to the original position (home position), and the printed portion of the workpiece W is replaced and fed. .

  As described above, according to the present embodiment, even when the workpiece W is sent while being tilted with respect to the sub-scanning movement axis, the head shaft rotating mechanism 10 (and the stage rotating mechanism 6) can move the workpiece W relative to the workpiece W. By adjusting the angle of the main scanning movement axis at a right angle, it is possible to perform printing accurately at a right angle to the extending direction of the workpiece W.

  In this embodiment, the workpiece W is moved in the sub-scanning direction and the inkjet head 51 is moved in the main scanning direction. However, the workpiece W is moved in the main scanning direction and the inkjet head 51 is moved in the sub-scanning direction. You may make it the structure to carry out. Moreover, although the detection apparatus 12 is comprised with the upstream imaging camera 41 and the downstream imaging camera 42, the optical sensor comprised in the shape of an array may be sufficient (both are not shown in figure).

  DESCRIPTION OF SYMBOLS 1 ... Inkjet recording apparatus 6 ... Stage rotation mechanism 7 ... X-axis table 8 ... Y-axis table 10 ... Head axis rotation mechanism 12 ... Detection apparatus 13 ... Control apparatus 51 ... Inkjet head 61 ... Axis movement mechanism 62 ... X * Y * (theta) Slide mechanism 63 ... Frame moving mechanism 64 ... X-axis slide mechanism 65 ... Y-axis slide mechanism 66 ... θ mechanism W ... Workpiece

Claims (6)

An ink jet recording apparatus that drives an ink jet head to print on the work while moving the ink jet head relative to the work that has been discharged in a reel-to-reel format in the main scanning direction and the sub-scanning direction. There,
A work stage on which the supplied work is set;
A sub-scanning movement table having a sub-scanning movement axis for relatively moving the work set on the ink jet head and the work stage in a sub-scanning direction;
A main scanning movement table having a main scanning movement axis for relatively moving the work set on the ink jet head and the work stage in a main scanning direction;
An ink jet recording apparatus comprising: main scanning side rotation means for minutely rotating the main scanning movement axis in a plane parallel to the workpiece. Detecting means for detecting an angular deviation of a center line of the workpiece on the workpiece stage with respect to an axis of the sub-scanning movement axis;
Control means for controlling the main scanning side rotation means so that the axis of the main scanning movement axis is orthogonal to the center line of the workpiece based on the detection result of the detection means. The inkjet recording apparatus according to claim 1. The main scanning side rotating means has a pair of shaft moving mechanisms that support both end portions of the main scanning moving shaft,
The said each axis | shaft moving mechanism is comprised by the X * Y * (theta) table which moves the said shaft edge part to a X-axis direction, a Y-axis direction, and (theta) direction minutely. Inkjet recording apparatus.   3. The ink jet recording apparatus according to claim 2, further comprising sub-scanning side rotating means for supporting the work stage and rotating the work stage minutely in a plane parallel to the work.   The control means further controls the sub-scanning side rotation means based on the detection result of the detection means so that the axis of the sub-scanning movement axis is parallel to the center line of the workpiece. The ink jet recording apparatus according to claim 4. The sub-scanning movement axis moves the workpiece in the sub-scanning direction with respect to the inkjet head,
6. The ink jet recording apparatus according to claim 1, wherein the main scanning movement axis moves the ink jet head in the main scanning direction with respect to the workpiece.

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