CN113524906A

CN113524906A - Table device and printing device

Info

Publication number: CN113524906A
Application number: CN202110386204.3A
Authority: CN
Inventors: 冈崎信; 井上隆史
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2020-04-17
Filing date: 2021-04-09
Publication date: 2021-10-22
Also published as: JP2021171663A; JP7417939B2

Abstract

The table device (2) is provided with a table (21), a stand (22), a linear scale (23), a first inkjet head holding member (24), and a second inkjet head holding member (25). The linear scale (23) is provided with a scale (231) and a detection unit (232). The first head holding member (24) is fixed at a first fixing position (22A) of the carriage (22), and the second head holding member (25) is fixed at a second fixing position (22B). A first portion (231A) of the scale (231) is fixed to the mount (22), and a second portion (231B) of the scale (231) other than the first portion (231A) is not fixed to the mount (22). Thus, a table device (2) capable of suppressing a reduction in printing position accuracy can be provided.

Description

Table device and printing device

Technical Field

The invention relates to a table device and a printing device

Background

In recent years, a method of manufacturing a device using an inkjet apparatus has been attracting attention. The inkjet device has a plurality of nozzles for ejecting droplets, and ejects the droplets from the nozzles while controlling the positional relationship between the nozzles and the print target. Thereby, the ink jet device applies droplets to the printing object.

As one of such ink jet devices, for example, japanese patent application laid-open No. 2009-131789 (hereinafter referred to as "patent document 1") discloses an ink jet device including a plurality of module heads (droplet discharge heads having a plurality of discharge ports) called line heads arranged in parallel in the width direction of a printing object.

The ink jet device disclosed in patent document 1 will be described below with reference to fig. 5.

As shown in fig. 5, the ink jet device 9 of patent document 1 includes a table device 91, a first discharge unit 92, a second discharge unit 93, and a main controller 94. The table device 91 includes a table 911, a mount 912, a first unit holding member 913, a second unit holding member 914, and an alignment camera 915. The table device 91 further includes a linear scale, not shown.

The table 911 is provided movably in the conveyance direction D with respect to the gantry 912. The table 911 includes an adjustment mechanism 911B and a θ adjustment mechanism 911C for the placement portion 911A, X. The object to be printed 90 is placed on the placement portion 911A. The X adjustment mechanism 911B moves the placement portion 911A in a direction perpendicular to the conveyance direction D and parallel to the horizontal plane. The θ adjustment mechanism 911C rotates the placement portion 911A about an axis extending in the vertical direction.

First unit holding member 913 and second unit holding member 914 are fixed to mount 912. The first unit holding member 913 includes a first unit movement shaft 913A. The first unit movement shaft 913A moves the first ejection unit 92 in the same direction as the movement direction in which the X adjustment mechanism 911B moves the placement part 911A. The second unit holding member 914 includes a second unit moving shaft 914A. The second unit moving shaft 914A moves the second ejection unit 93 in the same direction as the first ejection unit 92.

Four alignment cameras 915 are provided. Each alignment camera 915 reads the alignment mark of the printing object 90, and outputs the read result to the main controller 94.

The linear scale includes a scale and a detection unit. The scale is fixed to the mount 912 so as to extend in the conveyance direction D. The detection unit is fixed to the table 911 so as to face the scale. The detection unit detects position information obtained based on the scale, and outputs the detection result to the main controller 94.

When the printing object 90 is printed by the ink jet device 9, the printing object 90 is first fixed to the mounting portion 911A. Then, the main controller 94 controls the X adjustment mechanism 911B and the θ adjustment mechanism 911C based on the reading result of the alignment camera 915, and positions the printing object 90 at a predetermined position. When performing the positioning, the main controller 94 moves the first ejection unit 92 to a predetermined position on the first unit movement axis 913A and moves the second ejection unit 93 to a predetermined position on the second unit movement axis 914A.

Thereafter, the main controller 94 conveys the printing object 90 in the conveying direction D by the movement of the table 911. The linear scale transmits an ejection timing pulse corresponding to the position of the table 911 to the main controller 94 during conveyance of the printing object 90. Then, the main controller 94 controls the timing of ink ejection from the first and second

ejection unit units

92 and 93 based on the ejection timing pulse, and ejects ink to a desired position of the object to be printed 90.

In the ink jet device 9 shown in fig. 5, when the scale of the linear scale is fixed at the center of the four alignment cameras 915 when viewed from the top surface and is not fixed at the other portions, the amount of deformation of the scale and the amount of deformation of the mount 912 when there is a temperature change have the following relationship. That is, when the fixing position of the first unit holding member 913 is present between the fixing position of the scale and the fixing position of the second unit holding member 914, the amount of deformation of the scale and the amount of deformation of the mount 912 in the case of a temperature change have the following relationship.

Here, the difference between the amount of deformation of the measuring portion of the scale from the position where the scale is fixed to the position where the first unit holding member 913 is fixed and the amount of deformation of the portion of the mount 912 from the position where the scale is fixed to the position where the first unit holding member 913 is fixed is defined as a first deformation amount difference. On the other hand, the difference between the amount of deformation of the measuring portion of the scale from the position where the scale is fixed to the position where the second unit holding member 914 is fixed and the amount of deformation of the portion of the mount 912 from the position where the scale is fixed to the position where the second unit holding member 914 is fixed is defined as a second deformation amount difference.

In this case, the amount of deformation of the scale and the mount 912 increases as the distance from the fixed position of the scale increases. In addition, as described above, the fixed position of the first unit holding member 913 exists between the fixed position of the scale and the fixed position of the second unit holding member 914. Therefore, when the scale and the mount 912 are deformed due to a temperature change, a difference between the first deformation difference and the second deformation difference becomes large. The first deformation amount difference affects an error in position detection of the printing object 90 with respect to the first ejecting unit 92 by the linear scale. On the other hand, the second type of variation difference affects an error in position detection of the printing object 90 with respect to the second discharge unit 93. That is, if the difference between the first deformation amount difference and the second deformation amount difference becomes large, the printing position accuracy is lowered.

Disclosure of Invention

The invention provides a table device and a printing device capable of restraining reduction of printing position precision.

The table device of the present invention includes: a table on which an object to be printed is placed; a stand supporting the table to be capable of reciprocating; a linear scale; a first ink jet head holding member that holds the first ink jet head so as to face the printing object; and a second ink jet head holding member that holds the second ink jet head so as to face the printing object. The linear scale is provided with: a scale fixed to the mount so as to extend in the moving direction of the table; and a detection unit that is provided on the table and detects position information obtained based on the scale. The first ink-jet head holding member is fixed at a first fixed position of the stage, and the second ink-jet head holding member is fixed at a second fixed position of the stage which is away from the first fixed position in the moving direction of the table. Further, a first portion of the scale located between the first fixing position and the second fixing position is fixed to the mount, and a second portion of the scale other than the first portion is not fixed to the mount.

Further, the printing apparatus of the present invention includes: the above-described table device; a first ink-jet head held by a first ink-jet head holding member of the table device; and a second inkjet head held by a second inkjet head holding member of the stage device.

According to the present invention, it is possible to provide a table device and a printing apparatus capable of suppressing a reduction in printing position accuracy.

Drawings

Fig. 1 is a schematic view of an ink jet device according to embodiment 1 of the present invention, as viewed from above.

Fig. 2 is a schematic view of the ink jet device according to embodiment 1 as viewed from the front.

Fig. 3 is a schematic view of the ink jet device according to embodiment 2 of the present invention, as viewed from above, and is a schematic view of the ink jet device with a part cut away.

Fig. 4 is a schematic view of the ink jet device according to embodiment 2 as viewed from the front.

Fig. 5 is an overall view of the ink jet device disclosed in patent document 1.

Detailed Description

(embodiment mode 1)

Hereinafter, an ink jet device 1 according to embodiment 1 of the present invention will be described in sections with reference to fig. 1 and 2.

Fig. 1 is a schematic view of an ink jet device 1 according to embodiment 1 of the present invention, as viewed from above. Fig. 2 is a schematic view of the ink jet device according to embodiment 1 as viewed from the front.

In addition, the position and direction of the various configurations of the ink jet apparatus will be described by sometimes expressing the direction along the X axis shown in fig. 1 and 2 as the front-rear direction or the transport direction D, expressing the direction along the Y axis as the left-right direction, and expressing the direction along the Z axis as the up-down direction.

< Structure >

First, the structure of the ink jet apparatus 1 according to embodiment 1 will be described.

As shown in fig. 1 and 2, the inkjet device 1 includes a table device 2, a first line head 3, a second line head 4, a controller 5, and the like. The inkjet device 1 is an example of a printing device.

The table device 2 includes a table 21, a mount 22, a linear scale 23, a first line head holding member 24, a second line head holding member 25, a conveying unit, and the like, which are not shown.

The table 21 of the table device 2 includes a placement portion 211, a supported portion 212, a moving portion 213, and the like.

The printing object 10 is placed on the upper surface of the placement portion 211. The mounting portion 211 is configured to be capable of holding the printing object 10 by suction.

The supported portion 212 of the table 21 includes a pair of air bearings 214 provided on the lower surface. The pair of air bearings 214 are supported by a pair of guides 221 of the gantry 22, which will be described later.

The moving unit 213 of the table 21 is provided between the placing unit 211 and the supported unit 212. The moving unit 213 moves the placing unit 211 in the left-right direction with respect to the supported unit 212, and rotates the placing unit 211 about an axis extending in the up-down direction. The printing object 10 is positioned at a predetermined position by the movement and rotation of the mounting portion 211 by the moving portion 213.

The mount 22 of the table device 2 is made of, for example, stone. The carriage 22 is provided with a pair of guides 221 and a scale setting member 222. The pair of guides 221 and the scale setting member 222 are arranged to extend in the conveyance direction D from the front end (lower end in fig. 1) to the rear end (upper end in fig. 1) of the gantry 22.

As described above, the pair of guides 221 support the pair of air bearings 214, respectively. The table 21 is moved in the conveying direction D by driving of the conveying section while maintaining the air bearing 214 above the guide 221.

The scale setting member 222 is provided between the pair of guides 221 in the left-right direction.

The linear scale 23 includes a scale 231 and a detector 232. The scale 231 is made of, for example, low thermal expansion hard martensitic stainless steel. The scale 231 is fixed to the mount 22 via the scale setting member 222. The scale 231 is disposed in the conveyance direction D from the front end to the rear end of the gantry 22. The scale 231 is disposed so as to be positioned at the approximate center (including the center) in the left-right direction of the gantry 22. A first portion 231A (a portion indicated by a black square in fig. 1) of the scale 231 located at the center in the front-rear direction is fixed to the left surface (left surface in fig. 1 and 2) of the scale setting member 222.

As a method of fixing the scale 231 to the scale setting member 222, the following method is exemplified. That is, the following method can be exemplified: a stainless steel plate extending horizontally to the left from substantially the same height position as the upper surface and the lower surface of the scale 231 of the scale setting member 222 is fixed to the scale setting member 222, and the scale 231 is sandwiched by the plate from the top and bottom.

A second portion 231B of the scale 231 other than the first portion 231A, that is, second portions 231B located respectively on the front side and the rear side with respect to the first portion 231A are not fixed to the scale setting member 222. The second portion 231B is clamped together with the scale setting member 222 by a plurality of clamping members, not shown, arranged in a front-rear direction. That is, it is configured such that the first portion 231A of the scale 231 is fixed to the scale setting member 222, and the second portion 231B is not fixed to the scale setting member 222. Thus, the scale 231 is configured to expand and contract in the conveyance direction D about the first portion 231A by the second portion 231B due to the influence of heat.

The detection unit 232 is fixed to the lower surface of the supported portion 212 of the table 21. The detection unit 232 is disposed to face the scale 231. The detection unit 232 detects position information obtained based on the scale 231 and outputs the detection result to the controller 5.

The first line head holding member 24 is made of a stone material, for example, as in the case of the mount 22. The first line head holding member 24 is configured by a pair of first leg portions 241 extending vertically and a first bridge portion 242 connecting upper ends of the pair of first leg portions 241. The pair of first leg portions 241 are fixed to the first fixing positions 22A on the upper surface of the stand 22. As a method of fixing the first leg portion 241 to the mount 22, a method of fixing by a bolt that penetrates one of the first leg portion 241 and the mount 22 and is screwed to the other may be exemplified. Thereby, the first line head holding member 24 is provided such that the first bridge portions 242 extend in the left-right direction orthogonal to the conveying direction D and the table 21 is movable under the first bridge portions 242. The first line head holding member 24 is provided at a position on the front side of the first portion 231A of the linear scale 23 when viewed from above.

The second line head holding member 25 has, for example, the same structure as the first line head holding member 24. That is, the second line head holding member 25 fixes the pair of second leg portions 251 to the second fixing positions 22B on the upper surface of the mount 22 in the same manner as the first leg portions 241. Thereby, the second line head holding member 25 is provided such that the second bridge portion 252 extends in the left-right direction orthogonal to the conveying direction D and the table 21 is movable under the second bridge portion 252. The second line head holding member 25 is provided at a position behind the first portion 231A of the linear scale 23 when viewed from above.

The second line head holding member 25 is disposed such that a distance a2 from the center position of the first portion 231A in the front-rear direction to the center position of the second fixing position 22B in the front-rear direction is equal to a distance a1 from the center position of the first portion 231A in the front-rear direction to the center position of the first fixing position 22A in the front-rear direction when viewed from above.

Hereinafter, the position from the center of the first portion 231A in the front-rear direction to the center of the second fixing position 22B in the front-rear direction may be referred to as "from the fixing position of the scale 231 to the second fixing position 22B". Hereinafter, the position from the center of the first portion 231A in the front-rear direction to the center of the first fixing position 22A in the front-rear direction may be referred to as "from the fixing position of the scale 231 to the first fixing position 22A".

The first fixing position 22A and the second fixing position 22B have the same size as the bottom surfaces of the first leg portion 241 and the second leg portion 251, respectively. However, in fig. 1, the first fixing position 22A and the second fixing position 22B are illustrated to be slightly smaller than the bottom surfaces of the first leg portion 241 and the second leg portion 251 in order to facilitate understanding.

The conveying unit is driven by the control of the controller 5, and reciprocates the table 21 in the conveying direction D.

The first line head 3 has a plurality of module heads not shown. The module head includes a first ink jet head that ejects ink. The first line head 3 ejects ink of a first color at the time of printing of the printing object 10. The first line head 3 is fixed to the rear side of the first bridge portion 242 of the first line head holding member 24.

The second line head 4 includes a plurality of block heads not shown. The module head includes a second ink jet head for ejecting ink. The second line head 4 ejects ink of a second color different from the first color at the time of printing the printing object 10. The second line head 4 is fixed to the front side of the second bridge portion 252 of the second line head holding member 25.

That is, the first line head 3 and the second line head 4 are provided so as to face each other in the conveyance direction D.

The controller 5 controls the inkjet device 1. The controller 5 also functions as a control unit of the present invention. The control of the controller 5 will be described in detail later.

< printing Process >

Next, a printing process of the ink jet apparatus 1 will be specifically described.

First, as shown in fig. 1, in a state where the mounting portion 211 of the table 21 is positioned on the front side of the first line head holding member 24, the printing object 10 is held on the mounting portion 211 by suction. When the printing object 10 is held, the controller 5 controls the conveying unit to move the entire table 21 rearward along the conveying direction D. At this time, the detector 232 of the linear scale 23 outputs the detection result of the position information obtained based on the scale 231 to the controller 5.

Next, the controller 5 detects the position of the table 21 in the conveying direction D based on the detection result from the detecting section 232. At the same time, the controller 5 detects the positional relationship between the first line head 3 and the second line head 4 and the printing object 10.

Next, the controller 5 controls the operations of the first line head 3 and the second line head 4 based on the positional relationship between the first line head 3 and the second line head 4 and the printing object 10. At this time, the controller 5 ejects the ink of the first color from the first line head 3 at a predetermined timing and ejects the ink of the second color from the second line head 4 at a predetermined timing. Then, by ejecting the ink of the first color and the ink of the second color to the object 10, a predetermined pattern is printed on the object 10.

Next, when the table 21 reaches a predetermined position on the rear side of the second line head holding member 25, the controller 5 controls the conveying unit to stop the operation of the table 21. Thereafter, the controller 5 controls the conveying unit to move the entire table 21 forward along the conveying direction D. Thereafter, when the table 21 reaches the position shown in fig. 1, the controller 5 stops the operation of the table 21.

Then, the controller 5 releases the suction of the print target 10 by the placement unit 211.

In the printing process of the ink jet device 1 described above, printing on one printing object 10 is completed.

< effects of embodiment 1 >

As described above, in the ink jet device 1 according to embodiment 1, the first line head holding member 24 is fixed to the first fixing position 22A of the carriage 22, and the second line head holding member 25 is fixed to the second fixing position 22B of the carriage 22. At this time, the first portion 231A of the scale 231 located between the first fixing position 22A and the second fixing position 22B is fixed to the stage 22 via the scale setting member 222, and the second portion 231B is not fixed to the stage 22 via the scale setting member 222.

Normally, the scale 231 and the mount 22 deform with temperature change as described above.

Here, the difference between the amount of deformation of the measuring portion of the scale 231 from the fixing position of the scale 231 to the first fixing position 22A and the amount of deformation of the portion of the gantry 22 from the fixing position of the scale 231 to the first fixing position 22A is defined as a first deformation amount difference. On the other hand, the difference between the amount of deformation of the measuring portion of the scale 231 from the fixing position of the scale 231 to the second fixing position 22B and the amount of deformation of the portion of the gantry 22 from the fixing position of the scale 231 to the second fixing position 22B is defined as a second deformation amount difference. At this time, the amount of deformation of the scale 231 and the mount 22 becomes larger as the distance from the fixed position of the scale 231 becomes larger.

However, in the inkjet device 1 of embodiment 1, there is a fixed position of the scale 231 between the first fixed position 22A and the second fixed position 22B. Therefore, the difference between the first strain amount difference and the second strain amount difference can be made smaller than in the case of the above-described conventional technique. That is, as compared with the case of the above-described conventional technique, the difference between the error in detecting the position of the object to be printed 10 with respect to the first line head 3 and the error in detecting the position of the object to be printed 10 with respect to the second line head 4 can be reduced by the linear scale 23. This can more reliably suppress a decrease in the printing position accuracy of the ink jet apparatus 1.

In the ink jet device 1 according to embodiment 1, the distance a1 from the fixing position of the scale 231 to the first fixing position 22A is equal to the distance a2 from the fixing position of the scale 231 to the second fixing position 22B when viewed from above. This eliminates the difference between the error in detecting the position of the object to be printed 10 with respect to the first line head 3 and the error in detecting the position of the object to be printed 10 with respect to the second line head 4. As a result, the ink jet device 1 can be further inhibited from lowering in printing position accuracy. In particular, a decrease in the printing position accuracy for a large printing object 10 can be suppressed.

Hereinafter, for example, a case of printing on the printing object 10 having a size of G8 (2500mm × 2200mm) will be specifically described.

First, as in the conventional technique described above, when the scale 231 is fixed to the scale setting member 222 directly below the center 10C of the print target 10 located at the input position shown in fig. 1 and the other portions of the scale 231 are not fixed to the scale setting member 222, the distance a11 from the fixing position of the scale 231 to the first fixing position 22A is 1750 mm. The distance a11 corresponds to a distance from the center 10C to the first fixing position 22A when viewed from above. The distance a12 from the fixing position of the scale 231 to the second fixing position 22B is 3750 mm. The distance a12 corresponds to a distance from the center 10C to the second fixing position 22B when viewed from above.

In this case, the thermal expansion coefficient of the stone constituting the mount 22 was set to 10.8 μm/m/DEG C. In this case, when the temperature changes by 1 ℃, the amount of deformation of the portion of the stage 22 from the fixing position of the scale 231 to the first fixing position 22A (hereinafter, may be referred to as "first stage deformation amount of the comparative example") becomes 18.9 μm (═ 10.8 × 1.75 × 1). On the other hand, the coefficient of thermal expansion of the low thermal expansion hard martensitic stainless steel constituting the scale 231 was set to 6.3 μm/m/DEG C. In this case, when the temperature changes by 1 ℃, the amount of deformation of the measuring portion of the scale 231 from the fixing position of the scale 231 to the first fixing position 22A (hereinafter, sometimes referred to as "first scale deformation amount of comparative example") becomes 11.025 μm (═ 6.3 × 1.75 × 1). Therefore, the difference between the first frame deformation amount of the comparative example and the first scale deformation amount of the comparative example (hereinafter, may be referred to as "first deformation amount difference of the comparative example") was 7.875 μm (═ 18.9 to 11.025).

When the temperature changes by 1 ℃, the amount of deformation of the portion of the gantry 22 from the fixing position of the scale 231 to the second fixing position 22B (hereinafter, may be referred to as "second gantry deformation amount of the comparative example") becomes 40.5 μm (10.8 × 3.75 × 1). The amount of deformation of the measuring portion of the scale 231 from the fixing position of the scale 231 to the second fixing position 22B (hereinafter, may be referred to as "second scale deformation amount of the comparative example") is 23.625 μm (6.3 × 3.75 × 1). Therefore, the difference between the second frame deformation amount of the comparative example and the second scale deformation amount of the comparative example (hereinafter, may be referred to as "second deformation amount difference of the comparative example") was 16.875 μm (═ 40.5 to 23.625).

On the other hand, according to the configuration of embodiment 1, when printing is performed on the G8-sized printing object 10, the distance a1 from the fixing position of the scale 231 to the first fixing position 22A and the distance a2 from the fixing position of the scale 231 to the second fixing position 22B can be set to 1000mm when viewed from above. Therefore, when the temperature changes by 1 ℃, the amount of deformation of the portion of the stage 22 from the fixing position of the scale 231 to the first fixing position 22A (hereinafter, may be referred to as "first stage deformation amount of the embodiment") becomes 10.8 μm (10.8 × 1.00 × 1). The amount of deformation of the measuring portion of the scale 231 from the fixing position of the scale 231 to the first fixing position 22A (hereinafter, may be referred to as "first scale deformation amount of the embodiment") is 6.3 μm (6.3 × 1.00 × 1). Therefore, the difference between the first frame deformation amount of the example and the first scale deformation amount of the example (hereinafter, may be referred to as "first deformation amount difference of the example") was 4.5 μm (10.8 to 6.3).

Further, the difference between the amount of deformation of the measurement portion of the gantry 22 from the fixing position of the scale 231 to the second fixing position 22B (hereinafter, may be referred to as "second gantry deformation amount of the embodiment") and the amount of deformation of the measurement portion of the scale 231 from the fixing position of the scale 231 to the second fixing position 22B (hereinafter, may be referred to as "second scale deformation amount of the embodiment") (hereinafter, may be referred to as "second deformation amount difference of the embodiment") is also 4.5 μm. That is, in the configuration of embodiment 1, both the "first difference in strain amount of example" and the "second difference in strain amount of example" have the same value of 4.5 μm.

From the above, the first deformation amount difference of the example becomes smaller by 3.375 μm (═ 7.875 to 4.5) than that of the comparative example. In addition, the second variation difference of the example was reduced by 12.385 μm (16.875 to 4.5) compared to the second variation difference of the comparative example. That is, compared to the structure of the related art described above, in embodiment 1, the error in the position detection of the printing object 10 with respect to the first line head 3, which is affected by the first amount of deformation difference, and the error in the position detection of the printing object 10 with respect to the second line head 4, which is affected by the second amount of deformation difference, are smaller. As a result, the reduction in the printing position accuracy for the large printing object 10 can be further suppressed.

(embodiment mode 2)

Next, the inkjet apparatus 1A of embodiment 2 will be described in sections with reference to fig. 3 and 4. The same configurations and operations as those in embodiment 1 will be omitted or simplified.

Fig. 3 is a schematic view of the ink jet device 1A according to embodiment 2 of the present invention, viewed from above, and is a schematic view of the alignment camera with parts of the first bridge and the second bridge removed. Fig. 4 is a schematic view of the ink jet device 1A according to embodiment 2 of the present invention as viewed from the front.

< Structure >

First, the configuration of the ink jet apparatus 1A according to embodiment 2 will be described.

As shown in fig. 3 and 4, the inkjet device 1A according to embodiment 2 is different from embodiment 1 in that it includes four alignment cameras. Specifically, the four alignment cameras include a first alignment camera 261A, a second alignment camera 262A, a third alignment camera 263A, and a fourth alignment camera 264A. The first alignment camera 261A to the fourth alignment camera 264A are examples of the reading unit.

The first alignment camera 261A and the second alignment camera 262A are provided on the lower surface of the first bridge portion 242 of the first line head holding member 24 so as to be aligned in the left-right direction. The third alignment camera 263A and the fourth alignment camera 264A are provided on the lower surface of the second bridge portion 252 of the second line head holding member 25 so as to be aligned in the left-right direction. The first to fourth alignment cameras 261A to 264A are respectively disposed on the first bridge portion 242 or the second bridge portion 252 via the camera moving mechanism 27A. The camera moving mechanism 27A moves the first to fourth alignment cameras 261A to 264A in the conveying direction D or the left-right direction.

< printing Process >

Next, a printing process of the ink jet apparatus 1A will be specifically described. In embodiment 2, a case will be described in which alignment marks are provided near each of the four corners on the printing surface of the object to be printed 10.

First, the controller 5 recognizes the position of the alignment mark of the printing object 10 based on an input operation of a user to an input unit, not shown. Then, when the printing object 10 is held on the mounting portion 211 by suction as shown in fig. 3, the controller 5 controls the camera moving mechanism 27A based on the position of the alignment mark of the printing object 10. Thereby, the controller 5 adjusts the relative positions of the first to fourth alignment cameras 261A to 264A, respectively, to read the alignment marks one by one.

Next, the controller 5 controls the conveying unit to move the entire table 21 rearward along the conveying direction D. Then, the controller 5 stops the action of the table 21 in a state where the alignment mark is positioned below the first to fourth alignment cameras 261A to 264A.

Next, the first alignment camera 261A to the fourth alignment camera 264A read the alignment marks of the printing object 10, respectively, and output the read results to the controller 5.

Next, the controller 5 controls the moving section 213 based on the reading results of the first to fourth alignment cameras 261A to 264A. Thus, the controller 5 performs positioning of the printing object 10 by the rotation operation and the movement operation in the left-right direction of the placement unit 211 so that the printing object 10 is positioned at a predetermined position.

Next, when the positioning of the printing object 10 is completed, the controller 5 returns the placing unit 211 to the position shown in fig. 3. Then, the controller 5 sets the ejection timings of the inks from the first line head 3 and the second line head 4 based on the reading results of the first alignment camera 261A to the fourth alignment camera 264A.

Thereafter, the controller 5 performs the same control as in embodiment 1 to print a predetermined pattern on the printing object 10.

< effects of embodiment 2 >

As described above, the ink jet device 1A according to embodiment 2 has the following operational effects in addition to the same operational effects as those of embodiment 1.

That is, the inkjet device 1A according to embodiment 2 is provided with the first alignment camera 261A and the second alignment camera 262A on the first line head holding member 24. The third alignment camera 263A and the fourth alignment camera 264A are provided on the second line head holding member 25.

Here, as a method of setting the first alignment camera 261A to the fourth alignment camera 264A, the following method is considered: camera holding members that hold the first to fourth alignment cameras 261A to 264A are fixed to positions different from the first and

second fixing positions

22A and 22B on the upper surface of the gantry 22. However, in the case of the above-described fixing method, the amount of deformation of the portion of the mount 22 from the fixing position of the scale 231 to the first fixing position 22A or the second fixing position 22B accompanying the temperature change is greatly different from the amount of deformation of the portion of the mount 22 from the fixing position of the scale 231 to the fixing position of the camera holding member. Therefore, an error occurs in the position detection result of the print object 10 obtained by the linear scale 23 with respect to the first line head 3 or the second line head 4, and the print position accuracy is lowered.

Therefore, in the inkjet device 1A according to embodiment 2, the first alignment camera 261A to the fourth alignment camera 264A are provided on the first line head holding member 24 to which the first line head 3 is fixed or the second line head holding member 25 to which the second line head 4 is fixed. Therefore, the difference between the amount of deformation of the portion of the gantry 22 from the fixing position of the scale 231 to the first fixing position 22A or the second fixing position 22B and the amount of deformation of the portion of the gantry 22 from the fixing position of the scale 231 to the fixing positions of the first alignment camera 261A to the fourth alignment camera 264A due to the temperature change can be reduced. This can suppress an error in the result of detecting the position of the object 10 to be printed on the linear scale 23 with respect to the first line head 3 or the second line head 4. As a result, the reduction in printing position accuracy can be more reliably suppressed.

In addition, the inkjet device 1A according to embodiment 2 arranges the first alignment camera 261A to the fourth alignment camera 264A on the first line head holding member 24 or the second line head 4 via the camera moving mechanism 27A. Therefore, even if the printing object 10 is switched, the first alignment camera 261A to the fourth alignment camera 264A can be moved to the positions where the alignment marks can be read by driving the camera moving mechanism 27A. Accordingly, based on the reading results of the first to fourth alignment cameras 261A to 264A, the ejection timing of the ink from the first and second line heads 3 and 4 can be set to an appropriate timing according to the printing object 10. As a result, the reduction in printing position accuracy can be further suppressed. In particular, a reduction in printing position accuracy can be suppressed for a large printing object 10.

[ modified examples ]

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, in embodiment 1 and embodiment 2, a configuration in which the distance a1 from the fixing position of the scale 231 to the first fixing position 22A and the distance a2 from the fixing position of the scale 231 to the second fixing position 22B are equal has been described as an example, but they may be unequal.

In embodiment 2, a configuration in which the alignment cameras are provided on the first line head holding member 24 and the second line head holding member 25 has been described as an example, but the present invention is not limited to this. For example, one or more alignment cameras may be provided only on the first line head holding member 24 or the second line head holding member 25. In this case, the two alignment marks of the printing object 10 may be read by one or two alignment cameras provided only on the first line head holding member 24 or the second line head holding member 25. Further, three or more alignment marks may be read by one or three or more alignment cameras provided only on the first line head holding member 24 or the second line head holding member 25.

In embodiment 1 and embodiment 2, the configuration in which the first line head 3 is fixed to the rear side of the first line head holding member 24 and the second line head 4 is fixed to the front side of the second line head holding member 25 has been described as an example, but the present invention is not limited thereto. For example, the first line head 3 may be fixed to the front side of the first line head holding member 24, and the first line head 3 and the second line head 4 may be arranged so as not to face each other.

Claims

1. A stage device, wherein,

the table device includes:

a table on which an object to be printed is placed;

a stand that supports the table so as to be capable of reciprocating;

a linear scale;

a first ink-jet head holding member that holds the first ink-jet head so as to face the printing object; and

a second ink jet head holding member that holds the second ink jet head so as to face the printing object,

the linear scale is provided with:

a scale fixed to the mount so as to extend in a moving direction of the table; and

a detection unit that is provided on the table and detects position information obtained based on the scale,

the first ink-jet head holding member is fixed at a first fixed position of the stage,

the second inkjet head holding member is fixed to a second fixing position of the stage away from the first fixing position in the moving direction of the table,

a first portion of the scale located between the first fixing position and the second fixing position is fixed to the stage,

a second portion of the scale other than the first portion is not fixed to the mount.

2. The stage apparatus according to claim 1,

the table device further includes:

a reading unit that reads a mark provided on the printing object; and

a control part for controlling the operation of the display device,

the table includes:

a mounting unit on which the printing object is mounted; and

a moving section for moving the placement section,

the control unit moves the placement unit so that the print target is located at a predetermined position based on a reading result of the reading unit.

3. The stage apparatus according to claim 2,

the reading unit is provided on at least one of the first head holding member and the second head holding member.

4. The stage apparatus according to claim 1,

the distance from the first portion to the first fixed position is equal to the distance from the first portion to the second fixed position.

5. A printing apparatus, wherein,

the printing device is provided with:

the table apparatus of claim 1;

a first ink-jet head held by a first ink-jet head holding member of the table device; and

a second inkjet head held by a second inkjet head holding member of the stage device.