JP2014178243A - Curved surface printing/inspection facility and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve high inspection accuracy, and to improve the size reduction and maintainability of a facility.SOLUTION: A curved surface printing/inspection facility includes: a screen printing device 11 for performing screen printing for a skirt part of a piston 1; and an inspection device 12 for inspecting a screen printing part. The screen printing device 11 is configured to, while allowing the holding unit 13 to rotate the piston in a state where the piston 1 is brought into contact with a screen mesh 36 of a printing unit 15 when a holding unit 13 is lifted up, allow the screen mesh 36 to horizontally move for performing screen printing for the skirt part of the piston 1. The inspection device 12 is configured to lower the piston 1 held by the holding unit 13 to a position where the screen printing part of the piston 1 can be imaged by a camera 17 arranged below the screen mesh, and to allow the holding unit to rotate the piston 1, and to allow the camera 17 to image the screen printing part of the piston 1, and to analyze the pickup image to determine the quality of the screen printing part.

Description

  The present invention relates to a curved surface printing / inspection facility and method for performing screen printing on the surface of a printing medium having a curved surface and inspecting the screen printing unit.

  For example, in a piston for an internal combustion engine, a resin coat is applied to the surface of the skirt portion from the viewpoint of reducing friction at the skirt portion and improving seizure resistance. This resin coat is processed in a process of “degreasing” → “coating” → “baking”, and a screen printing method is mainly used as a coating method.

  The resin coat is excellent in adhesion to the piston base material, and once fired, only the film cannot be peeled off and correction is impossible. Therefore, it is important to inspect the coating layer immediately after coating and before firing. As an inspection method, an appearance inspection using an image analysis apparatus is performed from the viewpoint of labor saving and high accuracy.

  In screen printing, for example, Patent Literature 1 and Patent Literature 2 disclose that coating and inspection are performed in the same apparatus. In Patent Document 1, an inspection camera is arranged above a screen mesh.

  Further, in Patent Document 2, three cameras are used: a screen printing pattern inspection camera, a coating target (substrate) position recognition camera, and an inspection master image (reference image) creation camera. Screen printing pattern is inspected. Although only the master image creation camera is disposed below the screen mesh, the most important screen printing pattern inspection camera is disposed above the screen mesh.

JP 2012-124399 A Japanese Patent Laying-Open No. 2005-302821

  By the way, in the inspection of the screen print pattern, as in Patent Documents 1 and 2, an inspection camera is disposed above the screen mesh.

  In general, a camera captures reflected light. When a lower subject is photographed from above, light from above, such as sunlight or indoor lighting, is reflected on the subject and reflected in the camera. For this reason, in the case of Patent Documents 1 and 2 in which the inspection camera is arranged above the screen mesh, external light is reflected during imaging, and the robustness is lowered and the inspection accuracy is lowered. In order to prevent the reflection of external light, a disturbance light prevention cover is required.

  Further, if the inspection camera and the light source are arranged above the screen printing machine, the work for removing the subject is complicated, and there is a risk that the inspection camera may fall, so that the maintainability is deteriorated. .

  The object of the present invention has been made in consideration of the above-mentioned circumstances, and curved surface printing / inspection that can improve robustness at the time of imaging and realize high inspection accuracy, and can improve equipment compactness and maintainability. It is to provide facilities and methods.

  The curved surface printing / inspection facility according to the present invention includes a screen printing device that performs screen printing on the surface of a printing medium having a curved surface, and an inspection device that inspects at least one of the screen printing unit on the surface and its periphery. The screen printing apparatus includes: a holding unit that rotatably holds the printing material and is capable of moving up and down; and a screen mesh that is formed with a printing pattern and is movable in the horizontal direction. A printing means disposed above the holding means, and the printing medium is rotated by the holding means in a state where the printing medium is brought into contact with the screen mesh by the raising of the holding means. However, the screen mesh is moved in the horizontal direction by the printing means to perform screen printing on the surface of the substrate, and the inspection apparatus Imaging means for imaging at least one of a screen printing portion disposed on the surface of the printing medium and the periphery thereof, and the printing medium disposed below the screen mesh. A light source that irradiates at least one of the light source and the periphery thereof, and in a state where the printing medium is positioned at a position where the image pickup means can take an image by lowering the holding means, the holding means The printing body is rotated, and the imaging means captures at least one of the screen printing portion and its periphery of the substrate, and the captured image is analyzed to determine whether the screen printing portion and at least one of the periphery thereof are acceptable. It is characterized by being configured to determine and inspect.

  In the curved surface printing / inspecting method according to the present invention, a screen printing apparatus including a holding unit and a printing unit performs screen printing on the surface of a printing medium having a curved surface, and includes an imaging unit and a light source. A curved surface printing / inspection method for inspecting at least one of the screen printing portion on the surface and the periphery thereof, the step of holding the printed material rotatably by the holding means, The step of raising the holding means until the printing body is brought into contact with the screen mesh on which the printing pattern is formed of the printing means disposed above, and while rotating the printing body by the holding means, Moving the screen mesh horizontally by the printing means to perform screen printing on the surface of the substrate to be printed; and Lowering the holding means to position the printing medium at a position where it can be imaged by the imaging means arranged below the screen; and from the light source arranged below the screen mesh, Irradiating at least one of the screen printing unit and its periphery, rotating the printing medium by the holding unit, and imaging at least one of the screen printing unit and its periphery by the imaging unit; Analyzing the image picked up by the image pickup means and determining whether or not the screen printing unit and at least one of its periphery are good and bad.

  According to the present invention, since the imaging means of the inspection apparatus is disposed below the screen mesh in the printing means of the screen printing apparatus, the intrusion of light from above is suppressed by the screen mesh, and the imaging result due to disturbance light is reduced. The influence becomes very small, and the robustness at the time of imaging by the imaging means is improved. As a result, the accuracy of determining the quality of at least one of the screen printing unit and its periphery based on the captured image is improved, and high inspection accuracy can be realized.

  Further, since the rotation of the printing medium at the time of imaging by the imaging means of the inspection apparatus is realized by the holding means of the screen printing apparatus, the inspection apparatus does not need a mechanism for rotating the printing medium at the time of imaging by the imaging means. As a result, the equipment can be made compact.

  Further, since the image pickup means and the light source of the inspection apparatus are arranged below the screen mesh of the screen printing apparatus, it is easy to attach and detach the printing medium to the holding means, and the image pickup means or the light source is dropped. Since the screen mesh can be prevented from being damaged, the maintainability of the equipment can be improved.

1 is a front view showing a first embodiment of a curved surface printing / inspection facility according to the present invention. FIG. The top view which shows the curved surface printing and inspection equipment of FIG. The front view which shows the operating state of a top part pressing jig, a camera, etc. in the curved surface printing and inspection equipment of FIG. The front view which shows the operating state of a screen printing apparatus etc. in the curved surface printing and inspection equipment of FIG. The top view which shows the holding | maintenance unit in FIG.1 and FIG.2. FIG. Sectional drawing which follows the VII-VII line of FIG. The front view which shows 2nd Embodiment of the curved surface printing and inspection equipment which concerns on this invention. The front view which shows the operating state of the screen printing apparatus etc. of the curved surface printing / inspection equipment of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[A] First embodiment (FIGS. 1 to 7)
FIG. 1 is a front view showing a first embodiment of a curved surface printing / inspection facility according to the present invention. FIG. 2 is a plan view showing the curved surface printing / inspection facility of FIG. The curved surface printing / inspection equipment 10 shown in FIG. 1 and FIG. 2 includes a skirt portion 2 having a curved surface in a piston 1 for an internal combustion engine, for example, a substantially cylindrical substrate having a top on one end side. ) To form a resin coating for reducing friction and improving seizure resistance, the screen printing device 11 performs screen printing on the surface of the skirt portion 2 to form a screen printing portion (coating layer). In this embodiment, the inspection device 12 inspects the quality of the screen printing unit and its surroundings before firing, at least one of the screen printing unit and its periphery.

  The screen printing apparatus 11 includes a holding unit 13 as a holding unit, an elevating unit 14, a printing unit 15 as a printing unit, and a frame 16. In addition, the inspection device 12 includes a camera 17 as an imaging unit, a light source 18, and a determination unit 19. Here, as shown in FIGS. 5 and 7, the piston 1 is formed in a covered cylindrical shape having a top portion (top portion) 3 on the opposite side of the end portion of the skirt portion 2.

  The holding unit 13 holds the piston 1 so that the axis of the piston 1 can be rotated horizontally, and is provided so as to be lifted and lowered by the lifting unit 14. That is, as shown in FIGS. 1, 2, and 5, the holding unit 13 includes a piston rotation motor 21, a speed reduction mechanism 22, a piston holding jig 23, and a top pressing jig 24, and the piston rotation motor 21 is a base. The base 25 is attached to the lift slider 34 of the lift unit 14.

  The piston rotation motor 21 is composed of a motor capable of controlling the rotation direction, rotation angle, and rotation speed, for example, a servo motor. The speed reduction mechanism 22 is configured, for example, by meshing a worm gear 26 connected to the motor shaft of the piston rotation motor 21 and a worm wheel 27 connected to the piston holding jig 23. Accordingly, the piston holding jig 23 is rotationally driven in either the forward or reverse direction by the piston rotation motor 21 via the speed reduction mechanism 22.

  As shown in FIGS. 5, 6, and 7, the piston holding jig 23 is fitted with the end portion of the skirt portion of the piston 1 to position the piston 1 in the axial direction, A radial positioning portion 29 that presses the piston pin boss 4 of the piston 1 radially outward to position the piston 1 in the radial direction is provided.

  As shown in FIGS. 5 and 7, the top pressing jig 24 has a pressing member 31 made of resin, for example, attached to the upper end of the pressing plate 30. As shown in FIGS. 1 and 3, the pressing plate 30 It is attached to the piston rod of the cylinder device 32. The cylinder device 32 is installed on the elevating slider 34 of the elevating unit 14 together with the base 25. The pressing plate 30 is lifted by the extension operation of the piston rod of the cylinder device 32, and as shown in FIGS. 3 is pressed to prevent the piston 1 from falling off the piston holding jig 23.

  As shown in FIGS. 1 and 4, the elevating unit 14 has a guide rail 33 fixed to the frame 16, and an elevating slider 34 guided by the guide rail 33 is driven by a ball screw mechanism (not shown) by driving an elevating motor (not shown). (Not shown) is moved up and down. As described above, the base 25 of the holding unit 13 and the cylinder device 32 are attached to the elevating slider 34. The piston 1 held by the holding unit 13 is in a position where the surface of the skirt portion 2 comes into contact with a screen mesh 36 (described later) of the printing unit 15 at the highest position by the elevating unit 14 and can be imaged by the camera 17 at the lowest position. In this embodiment, it is positioned at the same horizontal position as the camera 17.

  As shown in FIGS. 1 and 2, the printing unit 15 is installed on the frame 16 above the holding unit 13. The printing unit 15 includes a screen mesh (stencil plate) 36 on which a printing pattern 35 is formed, a printing unit motor 38 that reciprocates the screen mesh 36 in a horizontal direction via a ball screw mechanism 37, and a screen mesh 36. A squeegee 39 that can be moved up and down and a doctor (ink return) 40 are provided. The coating agent is automatically automatically supplied onto the screen mesh 36 by an automatic supply device (not shown).

  As shown in FIG. 4, printing is performed while the piston 1 is rotated forward (in the direction of arrow A) by the holding unit 13 in a state where the piston 1 is brought into contact with the screen mesh 36 from below by the raising of the holding unit 13 by the elevating unit 14. The printing unit motor 38 of the unit 15 is driven to move the screen mesh 36 rightward in the horizontal direction (arrow B direction), and screen printing is performed on the surface of the skirt portion 2 of the piston 1. During this screen printing, the squeegee 39 comes into contact with the upper surface of the screen mesh 36, and the coating agent on the screen mesh 36 is extruded onto the surface of the skirt portion 2 of the piston 1 to transfer the print pattern 35 onto the surface of the skirt portion 2. To form a screen printing portion (coating layer).

  Immediately after the screen printing is completed, the screen mesh 36 is in a state of being moved to the rightmost side, and the coating agent is shifted to the left side on the screen mesh 36. In order to return the coating agent to the original position, when screen printing is completed, the squeegee 39 is raised, the doctor (ink return) 40 is lowered and brought into contact with the screen mesh 36, and the screen mesh 36 is moved by the printing unit motor 38. The coating agent is moved to the left in the horizontal direction (in the direction of arrow C), and the coating agent shifted to the left on the screen mesh 36 is moved to the right to supply the coating agent to the print pattern 35.

  As shown in FIGS. 1 to 3, the camera 17 of the inspection device 12 is installed on the frame 16 via a support base 41 below the screen mesh 36 of the printing unit 15 and applied to the skirt portion 2 of the piston 1. The screen printing unit is imaged. At the time of this imaging, the piston 1 held by the holding unit 13 is in the same horizontal position as the camera 17 by the lowering operation by the elevating unit 14, as shown in FIG. 3, and this camera 17 images the piston 1 from the horizontal direction. To do. Further, the camera 17 is preferably a line sensor camera, and the screen printing portion on the curved surface of the skirt portion 2 of the piston 1 is changed to the skirt portion by reversing the piston 1 around its axis in the direction of arrow D at the time of imaging. It is possible to take an image without being affected by defocusing or distortion caused by the curvature of the surface 2.

  The light source 18 is located below the screen mesh 36 of the printing unit 15 and is installed on the frame 16 via a support arm 42. Further, the light source 18 is disposed between the piston 1 held by the holding unit 13 and the camera 17, and irradiates light to the screen printing portion applied to the surface of the skirt portion 2 of the piston 1 during imaging by the camera 17. To do. The light source 18 is an annular ring illuminator which is disposed on a straight line P connecting the piston 1 held by the holding unit 13 and the camera 17 in a front view and whose axis coincides with the straight line P. A diffusion plate 43 for irradiating diffused light to the surface of the skirt portion 2 of the piston 1 is installed on the irradiation surface of the ring illuminator.

  As shown in FIG. 1, the determination unit 19 is communicably connected to the camera 17 and analyzes the captured image of the screen printing unit captured by the camera 17 in comparison with a master image registered in advance. Thus, the quality of the screen printing portion applied to the surface of the skirt portion 2 of the piston 1 is determined. The determination result of the determination unit 19 is transmitted to a controller (not shown) that controls the piston rotation motor 21 and cylinder device 32 of the holding unit 13, the lifting motor of the lifting unit 14, the printing unit motor 38 of the printing unit 15, and the like. The For example, when the determination unit 19 determines that the screen printing portion applied to the skirt portion 2 of the piston 1 is defective, the controller sorts the defective coating as a defective product. The operation of the screen printing apparatus 11 is stopped.

  Here, the configuration in which the camera 17 and the light source 18 of the inspection device 12 can be arranged below the screen mesh 36 of the screen printing device 11 as described above is as follows. The first reason is that the subject of the camera 17 is not a plan view shape, but a substantially cylindrical piston 1 having a curved surface, and the camera 17 is a line sensor camera. The second reason is that the piston rotation motor 21 of the holding unit 13 that rotates the piston 1 during screen printing by the screen printing device 11 can control the rotation direction, rotation angle, and rotation angle, for example, a servo motor suitable for imaging. Since the holding unit 13 having the piston rotation motor 21 is used to rotate the piston 1 when the camera 17 takes an image of the screen printing portion applied to the skirt portion 2 of the piston 1. It is.

  Next, the screen printing process and the inspection process of the curved surface printing / inspection facility 10 configured as described above will be described.

  In the screen printing process, first, as shown in FIGS. 1, 5, and 7, the piston 1 is attached to the holding unit 13 using an operator, a robot, or the like, and the piston holding jig 23 (axial positioning) of the holding unit 13 is used. It is rotatably held by the part 28 and the radial positioning part 29). Subsequently, as shown in FIGS. 3, 5, and 7, the cylinder device 32 of the top pressing jig 24 is operated, and the top 3 of the piston 1 is pressed by the pressing member 31 of the top pressing jig 24. 1 from the holding unit 13 is prevented.

  Next, as shown in FIG. 4, the elevating slider 34 of the elevating unit 14 is raised until the skirt portion 2 of the piston 1 held by the holding unit 13 is brought into contact with the screen mesh 36 of the printing unit 15. Is lowered. In this state, the printing unit motor 38 of the printing unit 15 is rotated while the piston rotation motor 21 of the holding unit 13 is rotated forward to rotate the piston 1 in the direction of arrow A around the axis (forward rotation). The screen mesh 36 is moved rightward in the horizontal direction (arrow B direction), and screen printing is performed on the surface of the skirt portion 2 of the piston 1.

  Thereafter, with the squeegee 39 raised and the doctor (ink return) 40 lowered, the printing unit motor 38 of the printing unit 15 is rotated to move the screen mesh 36 horizontally leftward (arrow C direction). The coating agent is applied to the print pattern 35 on the screen mesh 36, and the screen mesh 36 is returned to the original position. At the same time, as shown in FIG. 3, the lifting slider 34 of the lifting unit 14 is lowered to position the piston 1 held by the holding unit 13 at the same horizontal position as the camera 17.

  Next, in the inspection process, while irradiating light from the light source 18 to the screen printing portion in the skirt portion 2 of the piston 1 held by the holding unit 13, the piston rotating motor 21 of the holding unit 13 is reversed to rotate the piston 1. The screen is rotated around the axis in the direction of arrow D, and the screen printing portion of the piston 1 is imaged by the camera 17.

  After imaging by the camera 17, the determination unit 19 shown in FIG. 1 analyzes the captured image to determine whether or not the screen printing portion applied to the skirt portion 2 of the piston 1 is good and inspected, and presses the top of the holding unit 13. The jig 24 descends to release the pressure on the top 3 of the piston 1. In this state, the piston 1 is removed from the holding unit 13 using a robot or the like.

With the configuration as described above, the following effects (1) to (4) are achieved according to the first embodiment.
(1) Since the camera 17 of the inspection apparatus 12 is disposed below the screen mesh 36 in the printing unit 15 of the screen printing apparatus 11, intrusion of light from above the camera 17 is suppressed by the screen mesh 36, and disturbance The influence on the imaging result by light becomes very small, and the robustness at the time of imaging by the camera 17 is improved. As a result, the quality determination accuracy based on the captured image of the screen printing unit applied to the skirt portion 2 of the piston 1 is improved, and high inspection accuracy can be realized.

  (2) Since the rotation of the piston 1 during imaging by the camera 17 of the inspection apparatus 12 is realized by the holding unit 13 of the screen printing apparatus 11, the inspection apparatus 12 has a mechanism for rotating the piston 1 during imaging by the camera 17. Is no longer necessary. In addition, since the camera 17 is disposed below the screen mesh 36 and light intrusion from above the camera 17 is suppressed by the screen mesh 36, a disturbance light prevention cover is not necessary. As a result, the curved surface printing / inspection facility 10 can be made compact.

  (3) Since the camera 17 and the light source 18 of the inspection device 12 are disposed at substantially the same horizontal position as the piston 1 below the screen mesh 36 of the screen printing device 11, the attaching and removing operations of the piston 1 to and from the holding unit 13 are performed. In addition, the screen mesh 36 can be prevented from being damaged due to the camera 17 or the light source 18 being dropped. As a result, the maintainability of the curved surface printing / inspection facility 10 can be improved.

  (4) The light source 18 of the inspection apparatus 12 is a ring illuminator, and a diffusion plate 43 for irradiating diffused light is installed on the irradiation surface of the ring illuminator. For this reason, since it is possible to prevent uneven illumination and halation from occurring even on a glossy screen printing unit that has not yet been dried immediately after screen printing, the inspection of the screen printing unit based on the captured image can be realized with high accuracy.

[B] Second Embodiment (FIGS. 8 and 9)
FIG. 8 is a front view showing a second embodiment of the curved surface printing / inspection facility according to the present invention. In this 2nd Embodiment, about the part similar to 1st Embodiment, description is simplified or abbreviate | omitted by attaching | subjecting the same code.

  The surface printing / inspection facility 50 of the second embodiment is different from the first embodiment in that the camera 17 and the light source 18 of the inspection apparatus 12 are held by the lifting unit 14 of the screen printing apparatus 11 and the holding unit of the screen printing apparatus 11. 13 is configured to be able to move up and down integrally.

  That is, the base 25 of the holding unit 13 is installed on the lift slider 34 of the lift unit 14, and the support base 51 that supports the camera 17 and the light source 18 is fixed to the base 25. Thereby, the holding unit 13, the camera 17, and the light source 18 move up and down integrally without changing their relative positions when the lifting slider 34 of the lifting unit 14 moves up and down.

  Here, the support base 51 is set so as to be inclined downward by an angle θ with respect to the horizontal line 52, and the light source 18 is the screen mesh of the printing unit 15 at the highest position by the lift slider 34 of the lift unit 14 shown in FIG. 9. 36 is considered so as not to interfere with.

  Therefore, in the second embodiment, in addition to the same effects (1) to (4) as in the first embodiment, the following effect (5) is achieved.

  (5) Since the camera 17 and the light source 18 of the inspection apparatus 12 are configured to be movable up and down integrally with the holding unit 13 of the screen printing apparatus 11, after the screen printing shown in FIG. In the process of lowering, the piston 1 is rotated by the holding unit 13, the light is irradiated by the light source 18, and the screen printing portion applied to the skirt portion 2 of the piston 1 can be imaged by the camera 17. As a result, it is possible to reduce the inspection time of the screen printing portion in the skirt portion 2 of the piston 1 as compared with the case where imaging is started by the camera 17 and the light source 18 after the elevating slider 34 is lowered to the lowest position.

  As mentioned above, although each embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. For example, in each of the above-described embodiments, the case where the substrate to be printed is a cylindrical piston for an internal combustion engine has been described. However, even if it is another solid having a curved surface on its surface, such as a columnar body or an elliptical body. Good.

  In both of the above-described embodiments, light is irradiated from the light source 18 to the screen printing portion of the piston 1 and the periphery thereof (such as the land portion 5 including the ring groove 6 of the piston 1 or both sides of the skirt portion 2 shown in FIG. 5). However, the piston 1 may be rotated by the holding unit 13 and the screen printing unit and its surroundings may be imaged by the camera 17, and the captured image may be analyzed to determine whether the screen printing unit and its surroundings are acceptable or not. . In this case, the inspection of the periphery of the screen printing portion includes scratches on both sides of the land portion 5 or the skirt portion 2 including the ring groove 6, dents due to casting defects, or the presence or absence of chips remaining in the ring groove 6. It is. Or in both above-mentioned embodiments, while irradiating the periphery of the screen printing part of the piston 1 from the light source 18, the piston 1 is rotated by the holding unit 13 and the periphery of the screen printing part is imaged by the camera 17. The captured image may be analyzed to determine whether or not the periphery of the screen printing unit is good and inspected.

1 Piston (Substrate to be printed)
2 Skirt portion 3 Top portion 10 Curved surface printing / inspection equipment 11 Screen printing device 12 Inspection device 13 Holding unit (holding means)
14 Lifting unit 15 Printing unit (printing means)
17 Camera (imaging means)
18 Light source 19 Determination unit 21 Piston rotation motor 23 Piston holding jig 24 Top pressing jig 34 Lifting slider 35 Printing pattern 36 Screen mesh 50 Curved surface printing / inspection equipment

Claims (5)

A screen printing device for performing screen printing on the surface of the substrate to be printed having a curved surface, and an inspection device for inspecting at least one of the screen printing portion of the surface and its periphery,
The screen printing apparatus is configured to hold the printing body in a rotatable manner and to hold the printing medium up and down.
Comprising a screen mesh formed with a printing pattern and movable in the horizontal direction, and having a printing means disposed above the holding means,
While the printing medium is in contact with the screen mesh by the raising of the holding means, the screen mesh is moved in the horizontal direction by the printing means while rotating the printing medium by the holding means. Screen printing on the surface of the printed body,
The inspection apparatus includes an imaging unit that is arranged below the screen mesh and images at least one of a screen printing unit that is applied to the surface of the substrate to be printed and its periphery;
A light source that is disposed below the screen mesh and that irradiates at least one of the periphery of the substrate and its periphery;
The screen printing unit of the printing body is rotated by the imaging unit by rotating the printing body by the holding unit in a state where the printing body is positioned at a position where the imaging unit can be imaged by the lowering of the holding unit. A curved surface printing / inspection facility configured to take an image of at least one of the screen and the periphery thereof and analyze the captured image to determine whether or not the screen printing unit and at least one of the periphery thereof are inspected.   The light source is disposed between the printing medium held by the holding unit and the imaging unit, and is disposed on a straight line connecting the printing body and the imaging unit in a front view. The curved surface printing / inspection facility according to claim 1.   The image pickup means and the light source of the inspection apparatus are provided so as to be able to move up and down integrally with the holding means of the screen printing apparatus. The curved surface printing / inspecting facility according to claim 1, wherein at least one of the printing unit and its periphery is imaged.   The curved surface printing / inspecting facility according to claim 1, wherein the substrate to be printed is a piston for an internal combustion engine. A screen printing apparatus including a holding unit and a printing unit performs screen printing on the surface of a printing medium having a curved surface, and an inspection apparatus including an imaging unit and a light source includes the screen printing unit on the surface and the surface printing unit. A curved surface printing / inspection method for inspecting at least one of the surroundings,
A step of rotatably holding the substrate to be printed by the holding means;
Raising the holding means until the printing body is brought into contact with a screen mesh on which a printing pattern is formed, of the printing means arranged above the holding means;
A step of performing screen printing on the surface of the printing medium by moving the screen mesh horizontally by the printing means while rotating the printing medium by the holding means;
Lowering the holding means to position the substrate to be printed at a position where it can be imaged by the imaging means arranged below the screen mesh;
While irradiating at least one of the screen printing portion of the printed material and its periphery from the light source arranged below the screen mesh, the imaged device rotates the printed material by the holding device. Imaging at least one of the screen printing unit and its periphery;
A curved surface printing / inspection method comprising: analyzing an image picked up by the image pickup means to determine whether or not at least one of the screen printing unit and its periphery is good and bad.

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