JP2006281680A - Printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to inspect a printed result just after printing, especially to accurately measure the length of a printed pattern. <P>SOLUTION: How to solve the problem is performed as follows. A printing is performed under the condition that a work piece 110 (as one example of a printing object) is placed on a table 103. The inspection of a printed result is performed by forming a clearance above the table 103 through its lowering and then moving a measuring device such as a camera 755 (as one example of an image picking-up part) or the like just above the work piece 110. By moving the camera 755 by a camera unit part 750 so as to picking up the image of a measuring point by the camera from just above at all times, the length between measuring points are calculated based on the moving amount of the camera 755. By picking up the image of a reading mark for correcting an error engraved on the table 103 with the camera 755, a measuring error is calculated so as to be employed for the correction of measured values. In addition, by being measured by a distance measuring part, by measuring the distance between a printing object and the distance measuring part, the thickness of an ink (as one example of a paste) at the surface of the printing object is measured. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a printing press. In particular, the present invention relates to inspection of printing results by a printing press.

  In order to ensure the printing quality of the printing press, the printing result is inspected. For inspection, move the printed matter to a position where it can be seen by the inspector and either take the image directly by the inspector or move the printed matter to an inspection machine provided separately from the printing machine, and display the captured image on the display device. Then, it is performed by visual analysis or image analysis of the captured image.

Patent Document 1 discloses a method for inspecting a printed material on a table that has been aligned before printing.
That is, after printing, the table on which the printed material is placed is lowered, a camera used for positioning the printed material is inserted between the table and the screen, the printed material is imaged, and the quality of the printing is determined by image analysis. Will reprint. Since the printed matter is not moved, there is no need to align again.
JP 2000-211108 A

  In the method of inspecting after moving the printed matter, there is a problem that the inspection cannot be performed immediately after printing. For example, when the printed material shrinks due to drying after printing, it is found that the intended printing result is not obtained by inspection, but it may be difficult to determine where the cause is.

  The inspection method described in Patent Document 1 is for performing a local inspection, and there is a problem in that it is not possible to perform an inspection that requires a wide range such as length measurement.

  The present invention has been made to solve the above-described problems, for example, and it is an object of the present invention to perform inspections that require a wide range of inspection, such as measuring the dimensions of the entire printed pattern, immediately after printing. .

The printing press according to the present invention is:
An imaging unit for imaging a print target;
A support unit that supports the imaging unit and moves the imaging unit;
An analysis unit for analyzing an image captured by the imaging unit;
A length measuring unit that measures a length between two predetermined points on the surface of the print target based on the image analyzed by the analyzing unit and the moving amount of the imaging unit moved by the support unit;
It is characterized by having.

Furthermore, the length measuring unit is
The length of the pattern printed on the printing object is measured.

Alternatively,
The imaging unit further images a calibration plate having an error correction reading mark,
The analysis unit further analyzes the image of the calibration plate imaged by the imaging unit,
The length measuring unit further includes a predetermined distance on the surface of the calibration plate based on the image of the calibration plate analyzed by the analysis unit and the moving amount of the imaging unit moved by the support unit. The length is measured, compared with the known length between the two predetermined points, a measurement error is calculated, and based on the calculated measurement error, between the two predetermined points on the surface of the measured print object It is characterized by correcting the length.

  Further, the calibration plate is a table on which the printing object is placed.

Alternatively, the printing press according to the present invention further includes:
It has a printing condition control part which controls printing conditions based on the length between two predetermined points in the surface of the above-mentioned printing object which the above-mentioned length measurement part measured.

Furthermore,
The support part is
A linear scale motor is provided, and the imaging unit is moved.

The printing press according to the present invention is:
It has the unevenness | corrugation measurement part which measures the unevenness | corrugation of the surface of printing object, It is characterized by the above-mentioned.

Furthermore, the unevenness measuring part is
When printing is performed on the print target, the thickness of the paste printed on the surface of the print target is measured.

Alternatively, the printing press according to the present invention further includes:
It has a printing condition control part which controls printing conditions based on the thickness of the paste in the surface of the above-mentioned printing object which the above-mentioned unevenness measurement part measured.

  According to the present invention, for example, an imaging unit that images a print target, a support unit that supports the imaging unit and moves the imaging unit, an analysis unit that analyzes an image captured by the imaging unit, and the analysis unit A length measurement unit that measures a length between two predetermined points on the surface of the print target based on the image analyzed by the image sensor and the moving amount of the imaging unit moved by the support unit. There is an effect that the entire inspection is possible.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration of a lower part of a printing unit 109 of a screen printing machine (an example of a printing machine) according to this embodiment. The configuration of the upper part of the printing unit 109 will be described later with reference to FIG.
FIG. 1 shows an internal configuration excluding the printer base 108.
In FIG. 1, racks 703 and 704 and gears 705 and 706 that engage with the racks 703 and 704 are provided.
The gears 705 and 706 are gears having the same diameter and the same number of teeth, and are fixed to the drive shaft 700. Therefore, when the gear 705 rotates, the gear 706 also rotates synchronously by the same angle.
The racks 703 and 704 are flat-tooth racks, straight-tooth racks or straight-tooth racks fixed to both ends of the printer base 108 (not shown) so as to be parallel to the screen printing direction. And teeth that engage with the teeth of the gears 705 and 706, and a plurality of teeth of the same shape that are equally spaced are engraved.
The rotation of the motor 710 causes the drive shaft 700 provided with the drive shaft engaging portion 711 to rotate, and the gear 705 rotates in the directions of arrows E1 and E2. In synchronization with the rotation of the gear 705 in the directions of arrows E1 and E2, the gear 706 also rotates by the same angle in the directions of arrows F1 and F2.
As the gears 705 and 706 rotate, the drive shaft 700 moves the racks 703 and 704 in the directions of arrows C1 and C2 by an equal distance.
The drive shaft 700 is rotatably attached to the drive plate 730 by a drive bearing 731.
The drive plate 730 has a screen attachment portion 740 attached to be freely movable (details will be described later with reference to FIG. 7).
When the drive shaft 700 moves in the directions of arrows C1 and C2 due to the rotation of the drive shaft 700, the drive plate 730 also moves in the directions of arrows C1 and C2. Along with the movement, the screen attachment portion 740 also moves in the directions of arrows C1 and C2. This movement is guided by rails 701 and 702 and sliders 707 and 708. As a result, the screen attaching part 740 obtains driving force from both sides of the left part L and the right part R at the same time, and moves in the directions of arrows C1 and C2.
In this way, the screen can be moved smoothly and accurately. As described above, since the driving force is simultaneously applied from both the left and right sides, the movement of the screen attachment portion 740 is smoothly performed without shifting from side to side. Further, since the screen attaching portion 740 is guided by the rails 701 and 702 and the sliders 707 and 708, the screen attaching portion 740 can be smoothly moved without moving left and right.

The table 103 is a table that can be positioned in the X, Y, and θ directions. The table 103 is a table that can move in the directions of arrows B1 and B2, that is, in the vertical direction. The table 103 does not move in the directions of arrows C1 and C2 or in the directions of arrows D1 and D2, but is fixed to the base.
The table 103 includes a roller 781 that moves a work (an example of a print target) in the directions of arrows D1 and D2. The roller 781 can be rotated by a motor (not shown). The workpiece is carried in from the direction of the arrow D1, moved onto the table 103 by the rotation of the roller 781, and temporarily positioned. After this temporary positioning, the roller 781 is lowered in the direction of the arrow B2 so as not to obstruct printing. After printing, the roller 781 rises in the direction of arrow B1 and is rotated by a motor (not shown) to carry the workpiece in the direction of arrow D1 or arrow D2.

When the work is provisionally positioned on the table 103, the camera unit 750 operates to image a positioning mark preprinted on the work.
The camera unit unit 750 includes a camera 755 (an example of an imaging unit) and a support unit. The support unit includes motors 751 and 753, an arm rail 752, and an arm 754, and a camera 755 is attached to be movable in a two-dimensional direction. Thereby, the camera 755 can image an arbitrary position of the workpiece.
The camera 755 can be moved in the directions of arrows D1 and D2 by a motor 753 and an arm 754.
The arm 754 and the motor 753 are movable in the directions of arrows C1 and C2 by the motor 751 and the arm rail 752.
The arm rail 752 is fixed to the printer base 108 (not shown).
The camera unit 750 images the positioning marks printed at the four corners of the workpiece, and moves the table 103 in the X, Y, and θ directions to accurately position the workpiece.
A plurality of camera unit units 750 may be provided.

The camera unit 750 may use a linear scale motor.
With a linear scale motor, a sensor is attached to a mover that moves linearly based on the principle of a linear motor, and the position of the mover is measured by reading the scale installed in parallel with the movable range of the mover with the above sensor. The position of the mover is accurately controlled.
In that case, instead of the motor 751 and the arm rail 752, the first linear scale motor is attached to the printer base 108 at the left portion L and the right portion R, respectively. Further, the second linear scale motor is attached in a bridge shape to the mover of the first linear scale motor. The camera 755 is attached to the mover of the second linear scale motor.
Thereby, a camera can be moved more correctly. Further, since the linear scale motor has a large driving force, the camera can be moved at a higher speed.
Therefore, the use of a linear scale motor is preferable because it enables more accurate and high-speed measurement.

  Note that the configuration of the camera unit 750 is not limited to that described above, and other configurations may be used as long as the camera 755 can be moved in a two-dimensional direction.

After the workpiece is positioned, the camera unit 750 moves the camera 755 (and the arm 754) in the directions of arrows C1 and C2, and moves the table 103 to a range that does not interfere with the movement of the table 103 in the direction of arrow B1.
The table 103 raises the workpiece in the direction of the arrow B1 and performs printing. After printing, the table 103 lowers the work in the direction of arrow B2 and carries out the work.
The workpiece positioning operation by the camera unit 750 is performed every time the table 103 carries the workpiece, that is, immediately before printing the workpiece.
After the positioning by the camera unit 750 is performed, only the table 103 is moved up physically. Therefore, accurate printing can be performed on the workpiece positioned in the X, Y, and θ directions by the camera unit 750.

The screen attachment unit 740 is slidably attached in a self-propelled manner, but is fixed to the top of the table 103 when screen printing is performed. When the screen attachment part 740 slides, it is a case where the back surface of a screen is wiped.
The back wiping device 760 operates in conjunction with movement of the screen attachment portion 740 in the direction of the arrow C1 and / or C2. The back surface wiping device 760 performs back surface wiping by adhering the adhesive film 762 to the back surface of the screen via the roller 761.
The adhesive film is such that the roller 761 can move in the directions of arrows B1 and B2 with respect to the post 764, and when performing reverse wiping, the adhesive film is raised in the direction of arrow B1 and presses the adhesive film 762 against the back of the screen. . The winding unit 763 is rotated by a motor 765 to wind up the adhesive film 762.
The back wiping by the back wiping device 760 is repeated several times as necessary. In that case, the screen attachment portion 740 automatically moves in the directions of arrows C1 and C2 as many times as necessary. Since the screen slides, the back wiping device 760 can be externally attached as an option to the screen printing machine. Further, it is sufficient that the roller can be moved up and down as much as possible, and the configuration of the back wiping device 760 becomes very simple.

FIG. 2 is a diagram showing the configuration of the upper part of the printing unit 109 of the screen printing machine according to the present invention. FIG. 2 shows an internal configuration excluding the printer base 108.
FIG. 2 is a diagram illustrating a configuration in which the stroke portion 116 is moved and the stroke portion 116 is rotated in the directions of arrows A1 and A2. The stroke part 116 can be rotated around the fulcrum shaft 400, and the squeegee 111 and the scraper 311 can be easily attached or detached.

3 is a side view of the stroke portion 116 shown in FIG.
The squeegee 111 is held by the squeegee holder 120.
The scraper 311 is held by the scraper holder 320.
Further, the squeegee holder 120 and the scraper holder 320 are attached to the stroke portion 116 so as to be vertically movable by an air cylinder (not shown).
The stroke portion 116 can rotate in the directions of arrows A1 and A2 about the fulcrum shaft 400. The squeegee 111 and the scraper 311 can be easily attached to and detached from the squeegee holder 120 and the scraper holder 320 by rotating the stroke portion 116 in the direction of the arrow A1.
In the screen printing machine having such a configuration, the stroke portion 116 is moved in the directions of arrows C1 and C2 using the fulcrum shaft 400.

Further, in FIG. 2, racks 403 and 404 and gears 405 and 406 engaged with the racks 403 and 404 are provided.
The gears 405 and 406 are gears having the same diameter and the same number of teeth, and are fixed to the fulcrum shaft 400. Accordingly, when the gear 405 rotates, the gear 406 also rotates by the same angle synchronously.
The racks 403 and 404 are flat-tooth racks or immediate racks or helical racks fixed to both ends of the printer base 108 (not shown) so as to be parallel to the screen printing direction. A plurality of teeth having the same shape, which are engaged with the teeth and are equally spaced.
By the rotation of the slide shaft 409, the slider 407 provided with the slide shaft engaging portion 411 moves in the directions of arrows C1 and C2. With this movement, the gear 405 rotates in the directions of arrows E1 and E2. In synchronization with the rotation of the gear 405 in the directions of arrows E1 and E2, the gear 406 also rotates by the same angle in the directions of arrows F1 and F2. The rotation of the gears 405 and 406 causes the fulcrum shaft 400 to move in the directions of arrows C1 and C2 on the racks 403 and 404 by an equal distance. This movement is guided by rails 401 and 402 and sliders 407 and 408.
As a result, the stroke part 116 simultaneously obtains driving force from both sides of the left part L and the right part R and moves in the directions of the arrows C1 and C2.
In this way, the stroke portion 116 can move smoothly and accurately. As described above, since the driving force is simultaneously applied from both the left and right sides, the movement of the stroke portion 116 is smoothly performed without shifting from side to side.

4 is a detailed front view (partial cross-sectional view) of the configuration shown in FIGS. 1 and 2 as viewed from the Y direction.
FIG. 5 is a detailed plan view (partially sectional view) of the configuration shown in FIGS. 1 and 2 viewed from the X direction.
FIG. 6 is a detailed side view (partial cross-sectional view) of the configuration shown in FIGS. 1 and 2 as viewed from the Z direction.

When the screen printing machine is viewed from the front, the printer base 108 exists on both sides and the lower part.
A table 103 exists in the center portion of the printer base 108.
The table 103 is movable up and down in the directions of arrows B1 and B2 by the rotation of the motor 791. The rotation of the motor 791 is transmitted to the ball screw 792 by the belt 793 so that the table 103 can be moved up and down.
The table 103 can position the table surface in a three-dimensional direction regardless of the vertical movement of the table by a moving mechanism in the X, Y, and θ directions (not shown).
When the table is lowered, a gap S is generated between the printer base 108 and the table surface.
This gap S is a gap that penetrates the printer base in the horizontal direction. Therefore, the workpiece 110 can be carried in from the direction of the arrow S1 through the gap S and carried out in the direction of the arrow S2. The size of the gap S is longer than the thickness of the workpiece 110. Thus, the table 103 does not need to move in order to carry in and out the work 110. Therefore, the width W viewed from the front of the screen printer can be reduced.
The printer base 108 has a camera unit 750 attached to the upper part of the gap S.
On the upper part of the camera unit part 750, a screen attaching part 740 and a screen plate making 200 are slidably provided.
Furthermore, the stroke part 116 is provided in the upper part so that a slide is possible.
In the case of printing, the table 103 raises the work 110 after the work 110 is accurately positioned by the camera unit 750. At that time, the camera unit retracts the camera 755 and the arm 754 so as not to prevent the table 103 from being raised.

Rails 401, 402, 701, and 702 and racks 403, 404, 703, and 704 are fixed to the printer base.
Sliders 407, 408, 707, 708 are slidably attached to the rails 401, 402, 701, 702.
A fulcrum shaft 400 is rotatably attached to the sliders 407 and 408 via slider bearings 413 and 414.
The stroke portion 116 is attached to the fulcrum shaft 400 through the stroke portion bearings 415 and 416 so as to be rotatable. This rotation is automatically performed by the cylinders 451 and 452. A fulcrum 455 of the cylinder 452 is attached to the slider bearing 413, and a fulcrum 456 is attached to the stroke portion 116.

The slide shaft engaging portion 411 is engaged with the slide shaft 409 to change the rotational motion of the slide shaft 409 into a linear motion. As an example of the slide shaft engaging portion 411, a rotary liner can be used.
The slide shaft engaging portion 411 is fixed to the slider 407. Accordingly, the linear motion of the slide shaft engaging portion 411 is transmitted to the slider 407, the linear motion of the slider 407 is transmitted to the fulcrum shaft 400, and further leads to rotation of the gears 405 and 406.
The mounting position of the slide shaft engaging portion 411 is directly above the rail 401, so that the movement of the slide shaft engaging portion 411 can be directly guided by the rail 401.
The positions of the gears 405, 406, 705, and 706 are at both ends of the fulcrum shaft 400 and the drive shaft 700, and are outside the rails 401, 402, 701, and 702.
As described above, since the gears 405, 406, 705, and 706 that generate the driving force are located at the extreme ends, the movement of the stroke portion 116 and the screen attachment portion 740 can be performed more smoothly.

FIG. 7 is a diagram showing details of the drive plate 730 and the screen attachment portion 740.
The drive plate 730 includes brackets 732 at both ends in the direction in which the screen mounting portion 740 slides.
On the other hand, the screen attachment portion 740 includes a slide block 742. The bracket 732 and the slide block 742 are connected by a guide shaft 748. The slide block 742 is attached to the guide shaft 748 so as to be movable in both forward and reverse movement directions of the drive plate 730 by coil springs 747 and 749.
On the other hand, the printer base 108 is provided with a shock absorber 811 and a stop pin 812. When the screen attachment portion 740 has moved in the direction of the arrow C1, the shock absorber 811 reduces the moving speed, and the stop pin 812 positions the screen attachment portion 740 accurately.
While the stop pin 812 and the screen mounting portion 740 are in contact with each other, the motor 710 continues to move the drive plate 730 in the direction of the arrow C1. Although the screen attaching portion 740 cannot move in the arrow C1 direction after contacting the stop pin 812, the drive plate 730 continues to try to move in the arrow C1 direction. This driving force is absorbed when the coil spring 747 contracts. The driving force absorbed by the coil spring 747 becomes a repulsive force and presses the slide block in the direction of the arrow C1. That is, the screen mounting portion 740 is always kept pressed in the direction of the arrow C1, and positioning by the stop pin is performed accurately. The coil spring 749 is a spring that is compressed when the screen mounting portion 740 moves in the arrow C2 direction, and is used for positioning in the arrow C2 direction.

  As described above, since the drive plate 730 and the screen attachment portion 740 are movably attached, there is a possibility that a problem may occur when the back surface is wiped while the screen attachment portion is moving. Therefore, it is necessary to fix the drive plate 730 and the screen attachment portion 740 during the movement of the screen (during wiping the back).

FIG. 8 is a diagram illustrating a configuration of a fixing unit that fixes the driving plate 730 and the screen mounting unit 740.
A fixed piece 851 is fixed to the drive plate 730.
On the other hand, cylinders 852 are attached to the screen attachment portion 740 on both sides of the fixed piece 851.
When the screen mounting portion 740 is positioned by the stop pin 812, as shown in FIG. 8, the cylinder allows the drive plate 730 and the screen mounting portion 740 to move freely without sandwiching a fixed piece.
While the screen attachment portion 740 is moving, the fixing piece 851 is sandwiched from both sides by the cylinder 852, and the drive plate 730 and the screen attachment portion 740 are fixed. Thus, the back wiping device 760 can perform the back wiping in a state where both are fixed.

  FIG. 9 is a diagram showing a configuration for accurately positioning the screen and the screen mounting portion. Two rod cylinders 861 are fixed to the screen attachment portion 740. By adjusting both the rod cylinders 861, the arrangement position of the screen frame 211 on the screen attachment portion 740 can be adjusted. In this way, the position of the screen can be accurately arranged. After the position adjustment by both rod cylinders 861, the screen is fixed to the screen mounting portion 740 by the screen fixing portion 745.

FIG. 10 is a diagram showing details of the camera unit 750. As the motor 751 rotates, the ball screw 757 rotates and moves the arm 754 in the directions of arrows C1 and C2. Further, when the motor 753 is rotated, the ball screw 756 is rotated, and the camera 755 is moved in the directions of arrows D1 and D2.
With these structures, the camera 755 can move a range in which an arbitrary position on the surface of the workpiece can be imaged.
In the case shown in FIG. 10, there is one camera unit, but there may be a plurality of camera units.

  FIG. 10 illustrates the case where the camera 755 is moved using a rotary motor, but the camera 755 may be moved using a linear scale motor, or another method may be used.

Returning to FIG. 4 again, the side wall of the screen printer will be described.
The printer base 108 includes an upper side 901, an inclined side 902, and a lower side 903. The lower side surface 903 is provided on the inner side of the apparatus than the upper side surface 901.
By adopting such a configuration, a space can be provided between the line for loading the workpiece from both sides of the apparatus. Even when the line end portion protrudes toward the screen printing machine, the lower side surface 903 is recessed inward, so that the arrangement of the line end portion can be facilitated. Furthermore, when a person works on the side of the screen printing machine, the lower part of the apparatus is recessed, so that a foothold can be created and the work becomes easy. For example, when a screen plate having a width of about 2 m is attached to the screen printer, the screen plate must be inserted into the screen attachment unit 740 from the left and right sides, but it can be used as a scaffold for an operator who lifts and inserts the screen plate. Further, when the screen printing machine is transported by truck or the like, the width T at the lower part of the apparatus is loaded on the truck even when the maximum width W of the apparatus is larger than the maximum width that can be loaded on the truck. By making it smaller than the possible width, it can be loaded on a truck.

  The first feature of this embodiment is that in the conventional screen printing machine, the idea that fixing the screen is necessary for improving the accuracy of screen printing is stopped, and the screen can be moved. That is the point. Even if the screen is moved, the printing accuracy does not deteriorate compared to the conventional case. This is because the screen is fixed and the table is moved conventionally, but the present invention makes the screen movable and the table fixed. As described above, this embodiment is better than the conventional case when either the screen or the table moves. This is because, with the conventional table moving method, the table must move whenever the work is printed. On the other hand, in this embodiment, it is not necessary to move the screen every time printing is performed on the workpiece. When the screen needs to be moved during the printing operation, the back of the screen is wiped. In the case where the screen is wiped once for every five screen printings, neither the table nor the screen moves in five consecutive printings. Therefore, the printing accuracy can be improved in the method of moving the screen of this embodiment compared to the method of moving the table in the past.

  In this embodiment, the screen is not moved manually but automatically moved in conjunction with printing. Even if the back surface is manually wiped, the screen automatically slides after printing a predetermined number of times to create a state where the back surface can be wiped. Further, when the back surface wiping is automatically performed by the back surface wiping device, the screen printing and the back surface wiping are completely automated, and continuous screen printing can be performed without the intervention of an operator. In the present invention, instead of moving the screen, the table is fixed. Whereas both the screen and the table move, the positioning accuracy may drop. In this embodiment, the table is fixed, so that the positioning accuracy is lowered even when the screen can be moved. Without screen printing. Further, even when the screen is moved, the drive plate and the screen mounting portion can be accurately positioned by the stop pin in a state where the drive plate and the screen mounting portion are movably mounted by the coil spring.

  The second feature of this embodiment is that the camera is arranged at the printing position. By arranging the camera at the printing position, it is not necessary to move the table. Conventional cameras are provided outside the printing unit. For this reason, the location where the workpiece is accurately positioned, that is, the location where the camera is installed differs from the location where printing is performed. Although printing is possible by moving the table between these two places, in this embodiment, the position of the camera and the position of printing are the same. Therefore, it is possible to print a work by simply moving the table up and down without requiring the table to move back and forth or move left and right. With the table lowered, the camera can be moved between the table and the screen for positioning, and screen printing can be performed with the table raised. The movement of the camera to the imaging position or the retraction of the camera is interlocked with the vertical movement of the table, and these operations are interlocked with a control unit (not shown).

Embodiment 2. FIG.
A second embodiment will be described with reference to FIGS.

  The overall configuration of the screen printing machine (an example of a printing machine) in this embodiment is the same as that described in the first embodiment except for the camera unit 750, and thus the description thereof is omitted.

FIG. 11 is a diagram showing an example of the configuration of the camera unit 750 in this embodiment.
The camera unit 750 includes a camera 755 (an example of an imaging unit), a laser irradiation unit 655, a light receiving unit 656 (an example of a distance measurement unit), and a support unit. The support unit includes linear scale motors 652 and 654 (including movers 651 and 653).
The linear scale motor 652 moves the mover 651 in a direction perpendicular to the drawing in accordance with an instruction from a control unit (not shown). The linear scale motor 652 has a scale capable of measuring the position of the mover 651, can accurately measure the position of the mover 651, and can accurately control the position of the mover 651.
The mover 651 supports the linear scale motor 654.
The linear scale motor 652 is provided on the left and right in the figure, and can move the left and right movable elements 651 in parallel. The left and right movable elements 651 are controlled to move in exactly the same way. Accordingly, the linear scale motor 654 is always perpendicular to the linear scale motor 652, and the mover 653 of the linear scale motor 654 is perpendicular to the moving direction (perpendicular to the drawing) of the mover 651 of the linear scale motor 652. It can be moved in the direction (D1, D2 direction in the figure).
The linear scale motor 654 moves the mover 651 in the left-right direction (D1, D2 direction) in accordance with an instruction from a control unit (not shown). The linear scale motor 654 has a scale that can measure the position of the mover 653, can accurately measure the position of the mover 653, and can accurately control the position of the mover 653.
The mover 653 supports the camera 755, the laser irradiation unit 655, and the light receiving unit 656.
Thereby, the camera 755, the laser irradiation part 655, and the light-receiving part 656 can be moved just above arbitrary positions of the workpiece | work 110. FIG.

Here, the camera unit unit that moves the camera 755, the laser irradiation unit 655, and the light receiving unit 656 using a linear scale motor has been described. However, the camera 755 and the like are moved by the mechanism described in Embodiment 1. Also good.
Alternatively, the camera 755 or the like is not moved by such a rectangular coordinate system, but is configured by an arm that rotates around a fulcrum and a camera that moves along the arm, and the camera or the like is moved by a polar coordinate system. Also good. Other configurations may also be used.
That is, the specific implementation method is not limited as long as the camera 755 and the like can be moved directly above an arbitrary position of the workpiece 110 and the position can be accurately measured and controlled.

The camera 755 images the work 110.
The laser irradiation unit 655 irradiates the workpiece 110 with a laser.
The light receiving unit 656 receives the laser irradiated by the laser irradiation unit 655 and the laser reflected on the workpiece 110.

  In this embodiment, the inspection of the print result will be described.

In order to ensure printing quality and minimize printing defects, it is essential to inspect the printing results.
Conventionally, in order to inspect a print result, a print target that has been printed is taken out of the printer and inspected. As an inspection method, when an inspector visually inspects, a print target is imaged, the captured image is displayed on a display device, and the display result is visually inspected by the inspector, or the captured image May be analyzed by a computer and inspected based on the analysis result.
In particular, when a precise inspection is necessary, an image captured by a camera is enlarged and displayed, and inspection by visual inspection or image analysis is performed.

However, in the method in which the printing object is taken out from the printing machine and inspected, it is necessary to prepare an inspection machine or an inspection space separately from the printing machine, and the occupied space increases.
In addition, since the conditions change while the printing target is moved, the state immediately after printing cannot be inspected.

For example, the print target may shrink due to drying of the ink or changes in temperature and humidity.
As in the prior art, in the method of inspecting the print object from the printing machine, the inspection reveals that the print result does not have the intended dimensions. However, it may be difficult to identify the cause.
If the object to be printed is inspected immediately after printing, it can be seen that printing having the desired dimensions was made immediately after printing. After that, if another inspection is made and it is found that the dimensions are not the expected one, the cause is not due to a defective screen or the like during printing, but due to subsequent changes in the environment (temperature, humidity, etc.). I understand that there is. Therefore, it becomes easy to take necessary measures such as adjusting the temperature and humidity during printing.

In order to solve such a problem, it is only necessary to pick up an image of a print target using a positioning camera for the print target and inspect (using visual or image analysis) the image.
However, this method has several problems.
First, since the positioning camera is usually installed close to the object to be printed, it cannot capture a very wide range. Therefore, although it is suitable for local inspection, the length of the pattern printed over the entire surface of the printing target cannot be measured.
Secondly, even if the positioning camera is installed away from the object to be printed and the part that needs to be inspected can be captured with a single image, the image is distorted due to the optical characteristics of the camera. If this occurs, or if the printed result has irregularities, the length of the printed pattern cannot be measured accurately.

  In order to solve such a problem, in this embodiment, the camera unit 750 moves the camera 755 so that an arbitrary position of the workpiece 110 can be imaged. The camera 755 images the measurement points from directly above, and obtains the length between the measurement points from the movement distance of the camera 755.

FIG. 12 is a diagram showing an example of a block configuration of the camera unit unit 750 and the control unit 500 in this embodiment.
The control unit 500 includes a CPU (Central Processing Unit), a storage device such as a memory and a hard disk. Further, an input device such as an operation panel and an output device such as an LCD display device may be included. In FIG. 12, the functional block of the control unit 500 expressed as “˜unit” is realized by the CPU executing a program stored in a memory or the like. However, some or all of these functions may be realized by hardware.

The control unit 500 includes an analysis unit 501 that analyzes an image captured by the camera 755, a length measurement unit 502 that receives information on the position of the camera 755 from the camera unit unit 750, and measures a moving distance of the camera, and an analysis unit 501. An unevenness measurement unit 503, a length measurement unit 502, and an unevenness measurement unit 503 that measure the unevenness of the surface of the workpiece 110 from the analyzed image and measure the thickness of printed ink (an example of paste) or solder paste (an example of paste). Has a printing condition control unit 504 for controlling printing conditions so that a desired printing result can be obtained based on the measurement result.
In addition to this, the control unit 500 controls all operations related to printing such as loading and unloading of the workpiece 110, positioning of the table 103, printing, wiping the back of the screen, etc., which are omitted in FIG.

  FIG. 13 is a flowchart showing an example of a measurement procedure in this embodiment.

At the stage where printing is finished, the table 103 has moved up to the printing position.
In the measurement procedure, first, the table 103 is lowered to generate a gap with the screen 201 (S11).
Next, the camera unit 750 inserts the camera 755 into the gap generated between the table 103 and the screen 201, and moves the camera 755 to a position where the workpiece 110 can be imaged from directly above (S12).
Then, the camera 755 images the workpiece 110, the analysis unit 501 analyzes the image captured by the camera 755, compares the print pattern stored in advance with the first measurement point, and the camera 755 detects the first measurement point. It is determined whether or not it is directly above (S13).
When the camera 755 is not directly above the first measurement point, the analysis unit 501 calculates a movement amount to move the camera 755 based on the analyzed image, and the camera unit 750 moves the camera 755 again. (S12).
By repeating this, when the camera 755 comes directly above the first measurement point, the position (X ₁ ) of the mover 651 measured by the linear scale motor 652 and the position (X ₁ ) of the mover 653 measured by the linear scale motor 654 ( Based on Y ₁ ), the length measuring unit 502 stores the position (X ₁ , Y ₁ ) of the camera 755 (S13).
Next, the camera unit 750 moves the camera 755 (S14).
The camera 755 images the workpiece 110, the analysis unit 501 analyzes the image captured by the camera 755, finds the second measurement point by comparing with the print pattern stored in advance, and the camera 755 determines whether the second measurement point is true. It is determined whether it is above (S15).
When the camera 755 is not directly above the second measurement point, the analysis unit 501 calculates a movement amount to move the camera 755 based on the analyzed image, and the camera unit unit 750 moves the camera 755 again. (S14).
By repeating this, when the camera 755 comes directly above the second measurement point, the position (X ₂ ) of the mover 651 measured by the linear scale motor 652 and the position (X ₂ ) of the mover 653 measured by the linear scale motor 654 ( Based on Y ₂ ), the length measuring unit 502 stores the position (X ₂ , Y ₂ ) of the camera 755 (S16).
Then, the length measurement unit 502 moves the distance L (L ² = (X ₁ − −) of the camera 755 from the stored position of the camera 755 to the position immediately above the first measurement point to the position immediately above the second measurement point. X ₂ ) ² + (Y ₁ −Y ₂ ) ² ) is calculated and set as the length from the first measurement point to the second measurement point (S17).
When the linear scale motors 652 and 654 have a function of measuring the movement amounts of the movers 651 and 653, the movement distance L of the camera 755 is calculated based on the measured movement amounts of the movers 651 and 653. May be.

  If there are other points to be measured, the above procedure is repeated.

  In this way, the paste printed at an arbitrary position on the work 110 can be inspected by moving the camera 755 so that the camera 755 can image an arbitrary position on the surface of the work 110.

  Further, by moving the camera 755 directly above the workpiece 110 and calculating the length between the two points based on the amount of movement of the camera 755, an image caused by the optical system of the camera or the like is calculated. Measurement errors due to distortion and unevenness of printing results can be reduced.

  In the above description, the word “directly above” is used on the assumption that the workpiece 110 is placed horizontally on the table 103, but this is to eliminate the influence of unevenness on the surface of the workpiece 110. Furthermore, it means that the image is taken from the front, and the direction is not necessarily the same as the direction of gravity.

  Further, when the unevenness on the surface of the work 110 can be measured and corrected by the method described later, or when the unevenness on the surface of the work 110 can be ignored, it is not always necessary to take an image from directly above or from the front. In that case, the camera 755 may be moved so that the measurement point comes to the same position on the captured image.

  Further, when the distortion of the image due to the optical system of the camera can be corrected, or when the distortion of the image can be ignored, the measurement points do not have to be at the same position on the captured image. In that case, in addition to the movement amount of the camera 755, the length between measurement points is calculated in consideration of the difference in position on the image.

  Conventionally, a plurality of alignment cameras are installed corresponding to the number of alignment marks. Since the position where the alignment mark is printed is almost determined, the range assigned to each camera is shared. Therefore, one camera cannot capture an arbitrary position on the workpiece surface.

  In this embodiment, since one camera 755 can image an arbitrary position on the surface of the workpiece 110, there is no blind spot, and the length between arbitrary measurement points is measured regardless of the print pattern. it can.

  In addition, when measuring the length between two points, if the camera that captured the first measurement point and the second measurement point is different, errors caused by using different camera movement mechanisms, camera optics, etc. Errors due to subtle differences in system characteristics occur, making accurate measurements impossible.

  In this embodiment, since one camera 755 images both the first measurement point and the second measurement point, the above-described error can be suppressed and accurate measurement can be performed.

  In this embodiment, it is important that one camera 755 can image an arbitrary position on the surface of the workpiece 110, and this does not prevent the presence of a plurality of alignment cameras.

An error correction reading mark is engraved on the table 103 (an example of a calibration plate).
The table 103 is made of a material that hardly changes in size due to changes in temperature and humidity. For example, stone or ceramic.

The work 110 is not placed on the table 103 before printing is started or before one work 110 (an example of a print target) is printed and unloaded and the next work 110 is loaded. At this time, the camera 755 can image the table 103.
Alternatively, even when the workpiece 110 is placed on the table 103, the workpiece 110 is smaller than the table, and therefore the table 103 can be imaged by imaging a place where the workpiece 110 is not placed.
Therefore, an error correction reading mark is imprinted on the table 103, and this is imaged by the camera 755 before printing or the like.
Then, the length measurement unit 502 calculates the length between the measurement points on the table 103 from the movement amount of the camera 755 by the same procedure as that described above.

The length between measurement points is known in advance in the mark engraved on the table 103. This is assumed to be stored in the length measurement unit 502. Since the table 103 is made of a material whose size hardly changes due to changes in temperature and humidity, the length between measurement points is always substantially constant.
Or it is good also as having a thermometer and a hygrometer, measuring the temperature and humidity of the table 103, and correct | amending the length between the measurement points which the length measurement part 502 has memorize | stored.
In this case, even when the size of the table 103 slightly changes due to changes in temperature and humidity, the measurement error can be calculated in consideration of this, and thus it is possible to calculate the error more accurately, which is preferable.
In this case, even if the size of the table 103 changes due to changes in temperature and humidity, the measurement error can be calculated in consideration of this, so the size of the material of the table 103 changes little depending on the temperature and humidity. It is no longer necessary to use materials that are not used. Thereby, a more easily available material or a less expensive material can be selected, which is preferable.

  If there is no error in the measurement by the length measuring unit 502, the measured length and the stored length should match. However, if there is an error in measurement, they do not match.

Therefore, when the measured length does not match the stored length, the length measurement unit 502 stores the difference as a measurement error.
Then, when measuring the length between measurement points on the surface of the workpiece 110, the length calculated from the movement amount of the camera 755 is corrected using the stored measurement error. Thereby, more accurate measurement is possible.

  The error correction reading mark is not necessarily stamped on the table 103, and may be printed.

In addition to the table 103, a measurement error may be calculated by preparing a calibration plate with an error correction reading mark and placing the calibration plate on the table 103 and performing measurement.
However, the necessary parts can be reduced by imprinting an error correction reading mark on the table 103 and using the table 103 as a calibration plate. In addition, it is possible to measure errors between printing, which is preferable. For example, if printing is temporarily interrupted, it is preferable to automatically start the error measurement procedure because the latest correction value can always be obtained.

  As described above, the measurement error is calculated by the calibration plate having the error correction reading mark, and the length measurement unit corrects the measurement result by the measurement error, so that the measurement can be performed more accurately.

As described above, this embodiment is characterized in that the length of the pattern printed on the printing target is measured by imaging the printing target immediately after printing by the camera used for alignment.
As a result, it is possible to inspect the printing result immediately after printing, to easily determine the reason why the predetermined printing result cannot be obtained, and to take necessary measures such as adjusting the printing environment (temperature, humidity, etc.). There is an effect that it is easy to take.

In addition, this embodiment is characterized in that the camera captures a calibration plate having an error correction reading mark, analyzes the captured image, and obtains an error in the amount of movement by which the support unit moves the camera.
Thereby, even if there is an error in the amount of movement by which the support unit moves the camera, it can be corrected, so that the measurement accuracy can be improved.

In addition, this embodiment is characterized in that the calibration plate is a table on which a printing target is placed during printing.
As a result, there is no need to prepare any additional parts, and there is no need to align the position of the calibration plate, so that it is possible to reduce the labor and time required for the procedure for calculating the measurement error.

In addition, this embodiment is characterized in that the calibration plate is made of a material (stone, ceramic, etc.) whose size hardly changes with changes in temperature and humidity.
Accordingly, a correct measurement error can be calculated regardless of the temperature and humidity of the environment, and there is an effect that accurate measurement is always possible.

In addition, this embodiment is characterized in that the support unit moves the imaging unit using a linear scale motor.
As a result, the imaging unit can be moved quickly and accurately, and the measurement accuracy can be increased and the measurement time can be shortened.

Embodiment 3 FIG.
A third embodiment will be described with reference to FIGS. 11 to 12 and FIG.
Since the overall configuration of the screen printing machine (an example of a printing machine) in this embodiment is the same as that described in the second embodiment, description thereof is omitted here.

  In this embodiment, the inspection of the thickness of the paste among the inspection of the printing result will be described.

As a cause of problems in the printing result, the amount of paste may be insufficient or too much.
For example, when bleeding occurs in the printing result, it can be considered that there is too much ink (an example of a paste).
However, if the print result is inspected after the ink has dried, it may be difficult to determine how much the ink amount should be adjusted.

  Therefore, in this embodiment, by measuring the thickness (swelling) of the paste immediately after printing, the cause of the malfunction that occurs in the printing result is specified, and the paste amount, printing speed, printing pressure, etc. are adjusted appropriately. Make it possible.

  FIG. 14 is a flowchart showing an example of a measurement procedure in this embodiment.

At the stage where printing is finished, the table 103 has moved up to the printing position.
In the measurement procedure, first, the table 103 is lowered to generate a gap with the screen (S21).
Next, the camera unit 750 inserts the camera 755 into the gap generated between the table 103 and the screen 201, and moves the camera 755 to a position where the workpiece 110 can be imaged from directly above (S22).
Since the laser irradiation unit 655 and the light receiving unit 656 are attached to the camera 755, the laser irradiation unit 655 and the light receiving unit 656 also move directly above the workpiece 110 together with the camera.
And the laser irradiation part 655 irradiates the surface of the workpiece | work 110 with a laser (S23).
The camera 755 images the workpiece 110, the analysis unit 501 analyzes the image, and determines whether the laser irradiated by the laser irradiation unit 655 is irradiated to the measurement start point (S24).
When the point irradiated with the laser beam is deviated from the measurement start point, the analysis unit 501 calculates an amount to move the camera 755 based on the analyzed image, and the camera unit unit 750 moves the camera 755 again. Move (S22).
When this is repeated and the laser is irradiated to the measurement start point, the light receiving unit 656 receives the laser (S25).
At this time, the light receiving unit 656 receives what the laser irradiated by the laser irradiation unit 655 has reflected on the workpiece 110 and directly receives the laser irradiated by the laser irradiation unit 655.
This causes interference between the two lasers.
The intensity of the interfered laser changes depending on the phase difference between the two lasers.
Since the phase difference between the two lasers is determined by the difference in the distance of the path through which the two lasers have passed, the difference in the distance of the path through which the two lasers have passed can be found by measuring the intensity of the laser that has interfered.
Since the distance between the laser irradiation unit 655 and the light receiving unit 656 is constant, the distance of the path through which the laser beam reflected by the workpiece 110 passes is known.
Therefore, the light receiving unit 656 measures the intensity of the received laser.
The analysis unit 501 analyzes the intensity of the laser received by the light receiving unit 656, and calculates the distance of the path through which the laser reflected on the workpiece 110 passes (S26).

Next, the analysis unit 501 calculates the amount by which the camera 755 should be moved toward the measurement end point, and the camera unit 750 moves the camera 755 (S27).
While the camera 755 is moving, the laser irradiation unit 655 continues to irradiate the workpiece 110 with laser.
The camera 755 images this, and the analysis unit 501 analyzes it, and the analysis unit 501 controls the camera unit unit 750 so that the moving path of the laser irradiation point does not deviate from a desired path.
The light receiving unit 656 continues to receive the laser during this time, and the analysis unit 501 calculates the distance of the path through which the laser reflected on the workpiece 110 passes.
A subtle change in the thickness of the paste printed on the surface of the work 110 changes the distance of the path through which the laser reflected on the work 110 passes. The unevenness measuring unit 503 measures subtle unevenness on the surface of the workpiece 110 from the moving path of the laser irradiation point analyzed by the analyzing unit 501 and the distance of the path through which the laser reflected on the workpiece 110 passes.

  Thereby, the thickness of the paste printed on the workpiece 110 can be measured immediately after printing.

  In addition, it is good also as measuring intermittently instead of measuring continuously, moving the camera 755.

In this example, the irregularities on the workpiece surface are measured using laser interference, but other methods may be used.
For example, the distance to the surface of the workpiece 110 may be obtained by measuring the time until the laser is intermittently irradiated and the reflected laser is received.
Or you may measure an unevenness | corrugation by another method irrespective of the structure of laser irradiation and light reception.
In that case, since the printed ink or the like is not yet dried immediately after printing, it is preferable to take a method that can measure unevenness without contacting the object.

  The unevenness measurement procedure described in this embodiment may be performed separately from the length measurement procedure described in Embodiment 2, or the unevenness may be measured simultaneously while measuring the length.

  In this way, by measuring the subtle unevenness of the surface to be printed immediately after printing, it is possible to observe the paste paste immediately after printing, so it is possible to take effective measures against defects in the printing results. .

  In addition, the irradiation position can be accurately controlled by fixing the laser irradiation unit and the light receiving unit to the camera and moving them together in this way, and imaging the laser irradiation position irradiated by the laser irradiation unit with the camera. It is possible to accurately measure the unevenness of the surface to be printed.

  Further, as described above, since the unevenness of the surface of the printing object is measured using the interference of the laser, the fine unevenness can be measured.

As described above, this embodiment is characterized in that the unevenness on the surface of the print target is measured.
As a result, there is an effect that it is possible to inspect even a portion that is not known simply by looking at the print target in a plane.

Further, this embodiment is characterized in that the thickness of the paste printed on the surface of the printing object is measured immediately after printing on the printing object.
Thereby, it is possible to easily determine the influence of the printing conditions such as the amount of paste, the printing speed, and the printing pressure on the printing quality.

Embodiment 4 FIG.
A fourth embodiment will be described with reference to FIGS.
Since the overall configuration of the screen printing machine (an example of a printing machine) in this embodiment is the same as that described in the second embodiment, description thereof is omitted here.

  In this embodiment, a case will be described in which the printing conditions are automatically adjusted based on the measurement result.

  In order to obtain a desired printing result, it is necessary to control various printing conditions. For example, various conditions such as the pressure applied to the squeegee 111 during printing, the moving speed of the squeegee 111, the distance between the screen 201 and the work 110, the temperature of the printing environment, and the humidity affect the printing result.

  Therefore, in this embodiment, the printing result is measured and inspected immediately after printing, and the printing conditions are automatically adjusted based on the inspection result.

The printing condition control unit 504 acquires information about the inspection result of the printing result measured by the length measuring unit 502 and the unevenness measuring unit 503. In addition to this, the printing condition control unit 504 may receive information on the measured temperature and humidity from, for example, a thermometer and a hygrometer that measure the temperature and humidity of the printing environment.
The printing condition control unit 504 controls each part of the printing machine so as to change the printing condition based on the acquired information and obtain the best printing result. Furthermore, the temperature and humidity of the printing environment may be controlled by controlling an air conditioner or the like in the room where the printing machine is installed.

The printing condition control unit 504 stores in advance how the printing condition is changed and how the printing result is affected, and controls the printing condition based on the change.
The printing condition control unit 504 further stores the influence on the printing result as a result of changing the printing condition every time printing is performed while changing the printing condition.
The printing condition control unit 504 corrects the printing condition control method stored in advance using the relationship between the newly stored printing condition and the printing result as feedback, and reflects it in the next printing condition control.
Since the control method thus obtained is accumulated as know-how in the printing condition control unit 504, the printing condition control accuracy is improved as the printing is performed.
Furthermore, if the know-how stored in the printing condition control unit 504 can be notified to the outside, the control method thus obtained can be shared with other printing presses.
For example, the printer can be connected to a LAN (Local Area Network), the contents stored by the printing condition control unit 504 can be read and stored by an external computer, and the other printers connected to the LAN can be read and stored. Like that. Or you may comprise so that printing machines can exchange information directly.

  Thus, since the printing conditions are controlled according to the printing condition control method stored in advance, the printing conditions can be automatically adjusted so that the best printing result can be obtained without bothering the operator. .

  Further, in this way, the result of changing the printing condition is further inspected, and this is reflected as feedback to correct the printing condition control method, so that the printing condition control accuracy can be improved, for example, Thus, the number of trial printings required until the printing conditions are adjusted to obtain the best printing result can be reduced.

  Furthermore, by making it possible to share the know-how obtained by reflecting the feedback with other printing machines in this way, it is possible to further improve the control accuracy of the printing conditions and establish the printing conditions.

  In addition, as described above, since the state of the printing result immediately after printing is measured and the printing condition is controlled based on the measurement, it is possible to accurately control the printing condition by eliminating the influence of environmental changes and the passage of time. And the best printing result can be obtained.

As described above, this embodiment has a printing condition control unit that controls printing conditions based on the length between two predetermined points on the surface of the printing target measured by the length measurement unit. There is.
As a result, there is an effect that it is not necessary to manually adjust the printing conditions.

In addition, this embodiment is characterized in that it has a printing condition control unit that controls printing conditions based on the thickness of the paste on the surface of the printing object measured by the unevenness measuring unit.
As a result, there is an effect that it is not necessary to manually adjust the printing conditions.

Furthermore, this embodiment is based on both the length between two predetermined points on the surface of the print target measured by the length measurement unit and the thickness of the paste on the surface of the print target measured by the unevenness measurement unit. It is characterized by having a printing condition control unit for controlling printing conditions.
Accordingly, it is possible to adjust the printing conditions by comprehensively judging, and there is an effect that more appropriate printing condition control can be performed.

The figure which shows an example of a structure of the lower part of the printing part in Embodiment 1- Embodiment 4. FIG. The figure which shows an example of a structure of the upper part of the printing part in Embodiment 1- Embodiment 4. FIG. Sectional drawing which shows an example of the stroke part in Embodiment 1- Embodiment 4. FIG. The front view which shows an example of the screen printer in Embodiment 1- Embodiment 4. FIG. The side view which shows an example of the screen printer in Embodiment 1- Embodiment 4. FIG. The top view which shows an example of the screen printer in Embodiment 1- Embodiment 4. FIG. The figure which shows an example of the relationship between the drive plate in Embodiment 1- Embodiment 4 and a screen attachment part. The figure which shows an example of the fixing | fixed part in Embodiment 1- Embodiment 4. FIG. The figure which shows an example of the positioning part of the screen platemaking in Embodiment 1- Embodiment 4. FIG. FIG. 6 shows a camera unit section 750 in Embodiment 1. FIG. 10 is a diagram showing a camera unit unit 750 in Embodiments 2 to 4. FIG. 6 is a diagram illustrating an example of a block configuration of a camera unit unit 750 and a control unit 500 in Embodiments 2 to 4. FIG. 9 is a flowchart showing an example of a measurement procedure in the second embodiment. FIG. 9 is a flowchart showing an example of a measurement procedure in the third embodiment.

Explanation of symbols

  103 table, 108 printer base, 109 printing section, 116 stroke section, 111 squeegee, 120 squeegee holder, 311 scraper, 320 scraper holder, 201 screen, 211 screen frame, 400 fulcrum shaft, 401, 402, 701, 702 rail, 403 , 404, 703, 704 Rack, 405, 406, 705, 706 Gear, 407, 408, 707, 708 Slider, 409 Slide shaft, 410, 710 Motor, 411 Slide shaft engaging portion, 413, 414 Slider bearing, 415 416 Stroke Bearing, 451, 452 Cylinder, 700 Drive Shaft, 730 Drive Plate, 731 Drive Bearing, 732 Bracket, 740 Screen Mount, 742 Slide Block, 7 0 camera unit, 752 arm rail, 754 arm, 755 camera, 652, 654 linear scale motor, 651, 653 mover, 655 laser irradiation unit, 656 light receiving unit, 760 back wiping device, 761 roller, 762 adhesive film, 763 Winding unit, 811 shock absorber, 812 stop pin, 851 fixed piece, 852 cylinder, 861 rod cylinder, 500 control unit, 501 analysis unit, 502 length measurement unit, 503 unevenness measurement unit, 504 printing condition control unit, 110 workpiece .

Claims (9)

An imaging unit for imaging a print target;
A support unit that supports the imaging unit and moves the imaging unit;
An analysis unit for analyzing an image captured by the imaging unit;
A length measuring unit that measures a length between two predetermined points on the surface of the print target based on the image analyzed by the analyzing unit and the moving amount of the imaging unit moved by the support unit;
A printing machine comprising: The length measurement part
The printing press according to claim 1, wherein the length of the pattern printed on the printing object is measured. The imaging unit further images a calibration plate having an error correction reading mark,
The analysis unit further analyzes the image of the calibration plate imaged by the imaging unit,
The length measuring unit further includes a predetermined distance on the surface of the calibration plate based on the image of the calibration plate analyzed by the analysis unit and the moving amount of the imaging unit moved by the support unit. The length is measured, compared with the known length between the two predetermined points, a measurement error is calculated, and based on the calculated measurement error, between the two predetermined points on the surface of the measured print object The printing press according to claim 1, wherein the length is corrected.   The printing machine according to claim 3, wherein the calibration plate is a table on which the printing object is placed. The printing machine further includes:
2. The printing press according to claim 1, further comprising a printing condition control unit that controls printing conditions based on a length between two predetermined points on the surface of the printing object measured by the length measurement unit. . The support part is
The printing machine according to claim 1, further comprising a linear scale motor, wherein the imaging unit is moved. A printing machine comprising an unevenness measuring unit for measuring unevenness on a surface to be printed. The unevenness measuring part is
The printing press according to claim 7, wherein when printing is performed on the printing target, the thickness of the paste printed on the surface of the printing target is measured. The printing machine further includes:
The printing machine according to claim 7, further comprising a printing condition control unit that controls printing conditions based on the thickness of the paste on the surface of the printing target measured by the unevenness measuring unit.

Images