JPWO2020153497A1 - A curved screen printing device including a base material holding device, a base material holding method, and a base material holding device. - Google Patents

Abstract

The base material holding device (1) of the present invention has a pedestal (2) having a holding surface (21A) on which the base material (G) is placed, and a predetermined base material (G) on the holding surface (21A). It is provided with a positioning unit (3) configured to be positioned at a holding position and a suction unit (4) configured to suck a substrate (G) positioned at a predetermined holding position to a pedestal (2). The positioning unit (3) is provided on the first pressing unit (31) configured to press the base material (G) against the pedestal (2) and the pedestal (2), and is provided on the outer edge of the base material (G). A second outer edge contact member (32) configured to come into contact with a part thereof and a second base material (G) configured to come into contact with the outer edge contact member (32) by pressing the outer edge of the base material (G). It is equipped with a pressing unit (34).

Description

The present invention relates to a base material holding device, a base material holding method, and a curved screen printing device including a base material holding device.

Conventionally, a curved screen printing device that prints on a substrate having a curved surface is known (see, for example, Patent Document 1).
The curved screen printing apparatus of Patent Document 1 is based on a pedestal holding a base material, a screen plate, and a squeegee by moving them relative to each other in the printing direction and rotating the pedestal around a rotation axis orthogonal to the printing direction. Print the material. On the surface of the pedestal of this curved screen printing device, a groove having the same shape as the base material and a plurality of holes penetrating the pedestal are provided.
When the base material is placed and positioned in the groove of the pedestal, the suction device sucks the external air through the plurality of holes. By this suction, the base material is fixed to the pedestal.

International Publication No. 2017/086197

However, in the configuration as described in Patent Document 1, when the end portion of the base material floats from the surface of the pedestal due to the variation in bending of the base material, the base material is positioned without contacting the inner edge of the groove. May not be possible. Further, if the end portion of the base material floats from the pedestal, there is a possibility that poor adsorption of the base material may occur.
It is conceivable that the positioning of the base material is composed of a positioning pin and a means for pressing the outer edge of the base material in the direction of the positioning pin, but if the bending state varies, the above-mentioned positioning and suction can be appropriately performed. There is no change in the problem that there is no such thing.
Further, even if the base material is made for a flat plate having no curved surface, warpage may occur at least a part such as an end portion. Similar problems can arise when such a substrate is fixed to a flat pedestal.
Further, the same problem may occur when the flat plate-shaped base material is fixed to the pedestal having a curved surface.

An object of the present invention is to provide a base material holding device capable of appropriately positioning and holding a plate-shaped base material, a base material holding method, and a curved screen printing device including a base material holding device.

The base material holding device of one aspect of the present invention is a base material holding device for holding a plate-shaped base material, and has a pedestal having a holding surface on which the base material is placed and the base material holding surface. The positioning unit includes a positioning unit configured to be positioned at the above predetermined holding position and a suction unit configured to suck the substrate positioned at the predetermined holding position to the pedestal, and the positioning unit is the said. A first pressing unit configured to press the base material against the pedestal, an outer edge contact member provided on the pedestal and configured to contact a part of the outer edge of the base material, and an outer edge of the base material. It is provided with a second pressing unit configured to bring the base material into contact with the outer edge contact member.

According to this aspect, even if a part of the base material is floating when it is placed on the pedestal due to variations in bending of the base material, the base material is pressed against the pedestal and the floating part is used as the pedestal. The base material can be pressed against the outer edge contact member while being brought closer. Therefore, the outer edge of the base material can be reliably contacted with the outer edge contact member and can be positioned at a predetermined holding position. Further, by adsorbing the base material positioned at the predetermined holding position while pressing it against the pedestal, it is possible to suppress the adsorption failure.

In the base material holding device, it is preferable that the first pressing unit includes a plurality of main surface contact members configured to come into contact with the main surface of the base material.
In this aspect, since the contact area between the first pressing unit and the base material can be reduced, the frictional force when the base material is pressed by the second pressing unit can be reduced.

In the base material holding device, it is preferable that the first pressing unit further includes an advance / retreat control unit configured to independently advance / retreat the plurality of main surface contact members from the pedestal.
In this aspect, it is possible to press a substrate having various shapes with an appropriate force. Further, when the base material is pressed by the second pressing unit, the base material can be pressed with a stable force by making the main surface contact member follow the shape of the base material.

In the base material holding device, the main surface contact member is preferably a sphere.
In this embodiment, by bringing the sphere into point contact with the base material, the contact area between the two can be minimized, and the frictional force when the base material is pressed by the second pressing unit can be reduced.

In the base material holding device, it is preferable that the first pressing unit further includes a sphere holding unit configured to rotatably hold the sphere.
In this embodiment, when the base material is pressed by the second pressing unit, the frictional force between the base material and the sphere can be further reduced by rotating the sphere in contact with the base material, and the positioning of the base material can be performed. It can be done smoothly. In addition, scratches and breakage of the base material can be suppressed.

In the base material holding device, it is preferable that the positioning unit further includes a frictional force reducing unit configured to reduce the frictional force between the base material and the pedestal.
In this aspect, by reducing the frictional force between the base material and the pedestal, the pressing by the second pressing unit can be smoothly performed.

In the base material holding device, it is preferable that the height of the outer edge contact member from the holding surface of the base material on the pedestal is set to be equal to or less than the thickness of the base material.
In this aspect, when the base material holding device is applied to a curved screen printing device, even if the screen plate is brought into contact with the base material during printing, the tip of the outer edge contact member does not protrude from the printed surface of the base material, so that the outer edge contact occurs. Damage to the screen plate due to contact with the member can be suppressed. Therefore, it is possible to provide a base material holding device that does not affect the subsequent process.

In the base material holding device, the holding surface may have a curved surface.
The base material holding device of this embodiment can appropriately position and hold a base material having a curved surface.
Further, in the base material holding device of this embodiment, by pushing and bending the base material against the pedestal to hold the base material, the flat plate-shaped base material can be pressed against the outer edge contact member while maintaining the shape along the holding surface of the pedestal. Therefore, the outer edge of the base material can be reliably contacted with the outer edge contact member and can be positioned at a predetermined holding position. Further, by adsorbing the base material positioned at the predetermined holding position while pressing it against the pedestal, it is possible to suppress the adsorption failure. Therefore, the base material holding device of this embodiment can be appropriately positioned and held even when the flat plate-shaped base material is bent and held.

Further, in the base material holding device, the holding surface may be a flat surface.
In the base material holding device of this embodiment, even if the base material is made for a flat plate having no curved surface, the base material which may be warped at least a part such as an edge is appropriately positioned. Can be retained.

The base material holding device may further have a heating unit configured to heat the base material placed on the holding surface.
In the base material holding device of this embodiment, the base material can be fixed in a shape along the holding surface of the pedestal by heating the base material in a pressed and bent state. The heating temperature is controlled to, for example, a temperature above room temperature and below the softening point of the glass (for example, 25 ° C to 500 ° C).

The curved screen printing device according to one aspect of the present invention is a curved screen printing device that prints a predetermined pattern on a plate-shaped base material having a curved surface, and is the above-mentioned base material holding device, a screen plate, and the screen plate. A squeegee arranged above the base material and configured to apply ink to the base material held by the base material holding device via the screen plate, the pedestal of the base material holding device, the screen plate, and the above. It is provided with a print control unit configured to print the predetermined pattern on the substrate by relatively moving the squeegee.
According to this aspect, printing can be performed on an appropriately positioned substrate, so that printing quality can be improved.

The base material holding method of one aspect of the present invention is a base material holding method for holding a plate-shaped base material, in which the base material is placed on a holding surface of a pedestal and the base material is pressed against the pedestal. By pressing the outer edge of the base material pressed against the pedestal and bringing it into contact with the outer edge contact member that contacts a part of the outer edge of the base material, the base material is placed in a predetermined holding position on the holding surface. The base material that is positioned in the pedestal, pressed against the pedestal, and positioned at the predetermined holding position is adsorbed on the pedestal.
According to this aspect, the base material can be appropriately positioned and held.

In the base material holding method, when the outer edge of the base material is pressed, the base material is pressed against the pedestal by the first pressing force, and when the base material is adsorbed on the pedestal, the first pressing force is applied. It is preferable to press the base material against the pedestal with a second pressing force larger than that.
In this embodiment, the base material is pressed against the pedestal with a first pressing force smaller than the second pressing force at the time of positioning, so that the base material can be smoothly contacted with the outer edge contact member. At the time of adsorption, the base material is pressed against the pedestal with a second pressing force larger than the first pressing force, so that the base material can be smoothly adsorbed.

In the base material holding method, the holding surface may have a curved surface, or the holding surface may be a flat surface.

In the base material holding method, the base material may have a curved surface, or the base material may be a flat plate.

In the base material holding method, the base material placed on the holding surface may be heated.

FIG. 1A is a schematic cross-sectional view showing a schematic configuration of a base material holding device according to an embodiment of the present invention. FIG. 1B is a schematic plan view showing a schematic configuration of a base material holding device according to an embodiment of the present invention. FIG. 2A is an operation explanatory view of a base material holding method using the above base material holding device. FIG. 2B is an operation explanatory diagram of a base material holding method using the base material holding device. FIG. 2C is an operation explanatory diagram of a base material holding method using the above base material holding device. FIG. 3A is an operation explanatory view of the base material holding method following FIGS. 2A to 2C. FIG. 3B is an operation explanatory view of the base material holding method following FIG. 3A. FIG. 4A is a schematic view of a curved screen printing device provided with the base material holding device. FIG. 4B is an operation explanatory diagram of a printing method using a curved screen printing device. FIG. 4C is an operation explanatory diagram of a printing method using a curved screen printing device.

[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described. When explaining the arrangement position of each configuration, the direction is defined with reference to the XYZ axis of FIG. 1A, the + X direction is right, the −X direction is left, the + Y direction is front, the −Y direction is back, and the + Z direction. Is expressed as up, and the -Z direction is expressed as down.

[Structure of base material holding device]
As shown in FIGS. 1A and 1B, the base material holding device 1 holds a plate-shaped base material G having a curved surface.
Examples of the base material G include plates made of glass, ceramics, resin, wood, metal and the like. Examples of the glass include colorless and transparent amorphous glass, as well as crystallized glass and colored glass. The planar shape of the base material G is not particularly limited, and may be a polygonal shape, a circular shape, an elliptical shape, or any other shape.
The curved surface means a surface having a radius of curvature of 5000 mm or less. The curved surface provided on the base material G may be composed of only a convex surface having one main surface side projecting toward the other main surface side, or may include a concave surface projecting in the opposite direction in addition to the convex surface. It may have a plurality of convex and concave surfaces. Furthermore, in the case of only a convex surface or a concave surface, there may be a portion having a different curvature. Further, both a flat portion and a bent portion may be present, or a bent portion with a twist may be present.
The base material G of the present embodiment is formed in a rectangular shape in a plan view, and is bent in one direction about the center in the long side direction thereof.
The base material holding device 1 includes a pedestal 2, a positioning unit 3, a suction unit 4, and a control unit (not shown) that controls the entire base material holding device 1.

The base material G is placed on the pedestal 2. The surface 21 of the pedestal 2 is formed larger than the planar shape of the base material G. A part of the surface 21 constitutes a holding surface 21A having the same shape as the target bending shape of the base material G. In the present embodiment, the holding surface 21A is formed in a convex shape.
A plate 20 is fixed to the back surface of the pedestal 2. A recessed space 22 is provided between the pedestal 2 and the plate 20. The pedestal 2 is provided with a plurality of holes 23 that communicate the space above the holding surface 21A and the recessed space 22.

The positioning unit 3 positions the base material G at a predetermined holding position on the pedestal 2. The positioning unit 3 includes a first pressing unit 31, an outer edge contact member 32, a frictional force reducing unit 33, and a second pressing unit 34.

The first pressing unit 31 presses the base material G against the pedestal 2. The first pressing unit 31 includes seven main surface pressing mechanisms 311 and an elevating unit 312 for raising and lowering the seven main surface pressing mechanisms 311 with respect to the base material G.
The main surface pressing mechanism 311 is mainly a pneumatic or hydraulic cylinder 313 as an advance / retreat control unit, a sphere holding unit 314 fixed to the output shaft 313A of the cylinder 313, and a sphere holding unit 314 rotatably held. It is provided with a sphere 315 as a surface contact member.
The elevating unit 312 includes a holding body 316 that holds seven main surface pressing mechanisms 311 above the pedestal 2, and an elevating drive mechanism 317 that raises and lowers the holding body 316.
The holding body 316 holds the three main surface pressing mechanisms 311 so as to be arranged at equal intervals in the long side direction at the center of the base material G on the pedestal 2 in the short side direction. The holding body 316 holds one of the three main surface pressing mechanisms 311 so as to be located at the center of the base material G. In the holding body 316, the other two main surface pressing mechanisms 311 are arranged at equal intervals in the long side direction on one long side side from the center in the short side direction of the base material G, and in the long side direction. The position is held so as to be between the main surface pressing mechanisms 311 adjacent to each other in the three main surface pressing mechanisms 311. The holding body 316 has the remaining two main surface pressing mechanisms 311 axisymmetric with the other two main surface pressing mechanisms 311 with respect to a virtual line passing through the center of the base material G and parallel to the long side. Hold at the position of.

The outer edge contact member 32 comes into contact with a part of the outer edge of the base material G. The outer edge contact member 32 is a so-called positioning pin and is formed in a columnar shape. The outer edge contact member 32 is provided so as to project from the outside of the holding surface 21A on the surface 21 of the pedestal 2. The three outer edge contact members 32 are located at the center of the short side on the left side of the base material G, on the left end side of the lower center of the long side of the base material G, and on the right end side of the center of the lower long side. It is provided so as to come into contact with each other. The height of the outer edge contact member 32 from the holding surface 21A is set to be equal to or less than the thickness of the base material G.

The frictional force reducing unit 33 reduces the frictional force between the base material G and the pedestal 2 by applying a separating force to the base material G in a direction away from the pedestal 2. The frictional force reducing unit 33 is composed of a recessed space 22 and a hole 23 provided in the pedestal 2, and a gas supply unit 331 that supplies gas to the recessed space 22.

The second pressing unit 34 presses the outer edge of the base material G on the pedestal 2 and brings it into contact with the three outer edge contact members 32, thereby restricting the rotation of the base material G and on the holding surface 21A. Position to the holding position. The second pressing unit 34 includes three outer edge pressing mechanisms 341. The three outer edge pressing mechanisms 341 are held by the holding body 316 so as to press the positions opposite to the three outer edge contact members 32 against the base material G. The outer edge pressing mechanism 341 includes a vertical cylinder 342, a horizontal cylinder 343 fixed to the output shaft 342A of the vertical cylinder 342, and a square columnar pressing member 344 fixed to the output shaft 343A of the horizontal cylinder 343.

The adsorption unit 4 adsorbs the base material G on the pedestal 2. The suction unit 4 is composed of a recessed space 22 and a hole 23 provided in the pedestal 2, and a gas exhaust unit 41 that exhausts the recessed space 22.

[Base material holding method]
Next, a base material holding method using the base material holding device 1 will be described.
First, as shown in FIG. 1A, in an initial state in which the first pressing unit 31 and the second pressing unit 34 are separated upward from the pedestal 2, an operator or a transport means (not shown) attaches the base material G to the pedestal 2. Place it on top. At this time, if the curvature of the base material G is as designed, the base material G comes into contact with the holding surface 21A of the pedestal 2 over the entire surface as shown in FIG. 2A. However, when the curvature of the base material G deviates from the design, the end portion floats from the holding surface 21A as shown in FIG. 2B, and the center floats from the holding surface 21A as shown in FIG. 2C.

Next, the control unit drives the elevating drive mechanism 317 to lower the holding body 316, and as shown in FIG. 3A, presses the base material G with all the spheres 315 of the first pressing unit 31. Then, in the control unit, the timing at which almost the entire surface of the base material G comes into contact with the holding surface 21A, or the timing at which the lower end of the outer edge of the base material G is located below the upper end of the outer edge contact member 32 facing the lower end. By stopping the lowering of the holding body 316, the base material G is pressed with a first pressing force smaller than the second pressing force described later.
At this time, as shown in FIG. 1A, the holding body 316 is lowered with the height positions of all the spheres 315 being the same, and after the spheres 315 come into contact with the upper surface G1 of the base material G, the shape of the upper surface G1 is formed. The output shaft 313A of the cylinder 313 may be expanded or contracted according to the above. Alternatively, the holding body 316 may be lowered in a state where the output shaft 313A is expanded and contracted in advance by adjusting the height positions of all the spheres 315 to the shape of the upper surface G1.

After that, the control unit drives the gas supply unit 331 of the frictional force reducing unit 33 while maintaining the pressing state of the first pressing unit 31, and supplies gas to the hole 23 through the recess space 22. Then, a separating force is applied to the base material G. By applying this separation force, the frictional force between the base material G and the pedestal 2 is reduced.
Next, the control unit drives the vertical cylinders 342 of all the second pressing units 34 while maintaining the pressing state of the first pressing unit 31 and the state of applying the separation force of the frictional force reducing unit 33. And lowers the horizontal cylinder 343. After that, the control unit drives the horizontal cylinder 343 to press the base material G against the outer edge contact member 32 with the tip of the pressing member 344 as shown in FIG. 3B, and the base material G is applied to all the outer edge contact members 32. The drive of the output shaft 343A is stopped at the timing when the contact is completed and the positioning is completed.
When the base material G is pressed by the pressing member 344, the sphere 315 in contact with the upper surface G1 of the base material G rotates while following the shape of the upper surface G1 due to the expansion and contraction of the output shaft 313A of the cylinder 313.

Next, the control unit stops driving the gas supply unit 331 while maintaining the pressing state of the first pressing unit 31 and the second pressing unit 34. The control unit makes the pressing force by the first pressing unit 31 larger than the first pressing force by performing at least one of lowering the holding body 316 and extending the output shaft 313A of the cylinder 313. Adjust to the second pressing force.
After that, the control unit drives the gas exhaust unit 41 of the adsorption unit 4 to exhaust the gas in the holes 23 and the recessed space 22, thereby adsorbing the base material G to the pedestal 2.
By the above steps, the base material G is positioned at the holding position of the holding surface 21A of the pedestal 2, and is held by the pedestal 2 in a state where the tip of the outer edge contact member 32 does not protrude from the base material G.

Next, the control unit controls the horizontal cylinder 343 to separate the pressing member 344 from the base material G. Then, the control unit controls the vertical cylinder 342, the cylinder 313, and the elevating drive mechanism 317 to return the first pressing unit 31 and the second pressing unit 34 to the initial state shown in FIG. 1A.
After that, the base material G is subjected to processing such as printing, adhesive coating, or coating while being adsorbed on the pedestal 2.

[Action and effect of base material holding device and base material holding method]
According to the base material holding device 1 described above, the base material G is pressed against the pedestal 2 by the first pressing unit 31, and the base material G is pressed against the outer edge contact member 32 by the second pressing unit 34, so that the pedestal is pressed. Even if the base material G has a raised outer edge when placed on the 2, the base material G reliably contacts all the outer edge contact members 32 and is positioned at the holding position. Further, by adsorbing the base material G to the pedestal 2 while pressing it with the first pressing unit 31, it is possible to suppress the adsorption failure.

Since the member in contact with the base material G of the first pressing unit 31 is composed of a plurality of spheres 315, the contact area between the spheres 315 and the base material G can be reduced, and the base material in the second pressing unit 34. The frictional force when pressing G can be reduced.
Since the sphere 315 is rotatably held by the sphere holding unit 314, the base material G can be smoothly positioned and the base material G can be suppressed from being scratched or damaged.
By expanding and contracting the output shaft 313A of the cylinder 313, the sphere 315 is rotated while following the shape of the upper surface G1, so that the base material G can be pressed with a stable force.

When the base material G is pressed by the second pressing unit 34, the base material G is subjected to a separation force to reduce the frictional force with the pedestal 2, so that the second pressing unit 34 can be pressed smoothly. ..

Since the force for pressing the base material G against the pedestal 2 at the time of positioning is smaller than that at the time of suction, the base material G can be smoothly moved by pressing the second pressing unit 34 and the base material G can be moved to the pedestal 2. Both smooth adsorption can be achieved.

[Second Embodiment]
Hereinafter, the second embodiment of the present invention will be described. In the same parts as in the first embodiment, the description thereof will be omitted or simplified as appropriate.

[Structure of base material holding device]
The base material holding device of the present embodiment holds the flat base material G on the holding surface having a curved surface. That is, the flat plate-shaped base material G is pushed and bent to be fixed and held in a shape along the holding surface having a curved surface.
Here, the flat plate-shaped base material means a base material whose surface in contact with the holding surface of the pedestal is at least flat. The plane means a surface having a radius of curvature of more than 5000 mm. The type of the base material G and the configuration of the base material holding device are the same as those in the first embodiment.

[Action and effect of base material holding device and base material holding method]
When a flat plate-shaped base material G is placed on a holding surface having a curved surface of the base material holding device, the base material G may bend slightly due to its own weight, but the end portion is held, for example, as shown in FIG. 2B. It may float from surface 21A. By implementing the same base material holding method as the first embodiment using the base material holding device of the present embodiment, the same effect as that of the first embodiment can be obtained.

[Modification of base material holding device and base material holding method]
The present invention is not limited to the above embodiment, and various improvements and design changes can be made without departing from the gist of the present invention.

For example, one or more and six or less or eight or more main surface pressing mechanisms 311 may be provided, or may be arranged at a position where a portion floating from the pedestal 2 of the base material G can be pressed.
As the main surface contact member, instead of or in combination with the sphere 315, a roller may be applied to bring the cylindrical portion into line contact with the base material G, or a columnar or polygonal columnar member may be applied. .. When a columnar or polygonal columnar member is applied, the surface in contact with the base material G may be flat or may have the same shape as the curved surface of the base material G.
The holding body 316 may hold the sphere holding unit 314 without providing the advance / retreat control unit in the main surface pressing mechanism 311. In this case, the sphere holding unit 314 may hold the sphere 315 non-rotatably. Further, the sphere 315 (main surface contact member) may be held by the holding body 316 without providing the sphere holding unit 314.

Four or more outer edge contact members 32 may be provided.
As the outer edge contact member, a polygonal columnar member may be applied in place of or in combination with the columnar outer edge contact member 32. When the polygonal columnar member is applied, it may be provided so as to make point contact with the base material G or may be provided so as to make line contact. In the case of providing the base material G so as to make line contact, if the rotation of the base material G can be restricted, the two outer edge contact members may be provided so as to make line contact with the long side and the short side of the base material G, respectively.
If the rotation of the base material G can be regulated, for example, one L-shaped outer edge contact member in a plan view may be provided so as to make line contact with the corner portion of the base material G.
The height of the outer edge contact member 32 from the holding surface 21A may be set to a height exceeding the thickness of the base material G.

As the frictional force reducing unit, a roller may be provided on the holding surface 21A instead of or in combination with a configuration in which a separating force is applied, and the base material G may be moved by the rotation of the roller.
The hole for supplying the gas by the gas supply unit 331 may be provided separately from the hole for exhausting the gas by the gas exhaust unit 41 of the adsorption unit 4.
It is not necessary to provide a friction force reducing unit.

Four or more outer edge pressing mechanisms 341 may be provided. If the rotation of the base material G can be restricted by the outer edge contact member, the outer edge pressing mechanism 341 may be provided so as to press the base material G at a position other than the position opposite to the outer edge contact member. Further, only one or two outer edge pressing mechanisms 341 may be provided.
As the pressing member, a columnar or polygonal columnar member other than the square may be applied in place of or in combination with the square columnar pressing member 344.
The horizontal cylinder 343 may be held by the holding body 316 without providing the vertical cylinder 342 in the outer edge pressing mechanism 341.
The outer edge pressing mechanism 341 may be held by a member different from the holding body 316.

In the above embodiment, the force for pressing the base material G against the pedestal 2 at the time of positioning is smaller than that at the time of adsorption, but it may be larger or the same.

In addition to printing, adhesive application and coating, the base material G held by the base material holding device 1 is subjected to processing such as grinding and polishing, film bonding, masking and the like, and dimensional measurement is performed. You may.

Further, in the base material holding device and the base material holding method of the above-described embodiment, the holding surface of the pedestal has a curved surface, but the method is not limited thereto. For example, even if the substrate is manufactured for a flat plate having no curved surface, warpage may occur at least a part such as an end portion. Even when such a substrate is fixed to a pedestal having a flat holding surface, the base material holding device and the base material holding method of the present invention can achieve the effects described in the above-described embodiment. Further, even when the substrate having a curved surface is fixed to a pedestal having a flat holding surface, the base material holding device and the base material holding method of the present invention can achieve the effects described in the above-described embodiment. That is, the base material holding device and the base material holding method of the present invention may target a flat plate-shaped substrate in which at least a part of the substrate may be warped, and the holding surface of the pedestal may be flat.

Further, the base material holding device of the present invention may be provided with a heater unit inside the pedestal, for example, and may have a configuration for heating the base material. By heating the base material in a bent state, the base material can be fixed in a shape along the surface of the pedestal. The heating temperature is controlled to a temperature above room temperature and below the softening point of the glass (for example, 25 ° C to 500 ° C). In particular, when fixing a flat plate-shaped base material to a holding surface having a curved surface, it is preferable that the base material holding device of the present invention includes a heater unit.

[Construction of curved screen printing device]
The curved screen printing device 10 prints a predetermined pattern on a plate-shaped base material G having a curved surface. As shown in FIG. 4A, the curved screen printing device 10 includes a base material holding device 1, a screen plate 11, a squeegee 12, and a printing control unit 13.

The screen plate 11 is provided on the right side of the base material holding device 1 in FIG. 4A.
The squeegee 12 is arranged above the screen plate 11.
The print control unit 13 relatively moves the pedestal 2, the screen plate 11, and the squeegee 12.

[Printing method using curved screen printing device]
Next, a printing method using the curved screen printing apparatus 10 will be described. The movement direction and operation order of the pedestal 2, the screen plate 11, and the squeegee 12 are not limited to the following contents, and any movement direction and operation order that can be printed on the base material G may be applied.
First, using the above-mentioned base material holding method, the base material G is positioned and held at a predetermined holding position of the pedestal 2 by the base material holding device 1.
Then, as shown in FIG. 4B, the print control unit 13 moves the pedestal 2 and positions it directly under the screen plate 11. When the pedestal 2 is moved, the print control unit 13 rotates the pedestal 2 so that the right end of the base material G in FIG. 4B is closest to the screen plate 11.

Next, the print control unit 13 lowers the screen plate 11 to bring it closer to the base material G, then lowers the squeegee 12 to press the lower surface of the screen plate 11 against the upper surface G1 of the base material G. After that, the print control unit 13 horizontally moves the squeegee 12 to the position shown in FIG. 4C while fixing the screen plate 11, and synchronizes with the movement of the squeegee 12 to move the pedestal 2 to the left and lower. Rotate clockwise while moving to. By the movement of the squeegee 12 and the pedestal 2, the squeegee 12 pushes out the ink from the screen plate 11 and applies it to the entire printing range of the base material G.
At this time, since the tip of the outer edge contact member 32 does not protrude from the upper surface G1 of the base material G, the screen plate 11 and the outer edge contact member 32 do not come into contact with each other during printing. As a result, damage to the screen plate 11 can be suppressed.
After that, the print control unit 13 returns the pedestal 2, the screen plate 11, and the squeegee 12 to the initial positions shown in FIG. 4A.

In such a printing method, printing is performed on the base material G appropriately positioned by the base material holding device 1, so that the print quality can be improved.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2019-010187 filed on January 24, 2019, the contents of which are incorporated herein by reference.

1 ... Base material holding device, 2 ... Pedestal, 3 ... Positioning unit, 4 ... Adsorption unit, 10 ... Curved screen printing device, 11 ... Screen plate, 12 ... Squeegee, 13 ... Printing control unit, 31 ... First pressing unit , 32 ... outer edge contact member, 33 ... friction force reduction unit, 34 ... second pressing unit, 313 ... cylinder (advance / retreat control unit), 314 ... sphere holding unit, 315 ... sphere (main surface contact member), G ... base Material.

Claims (18)

A base material holding device that holds a plate-shaped base material,
A pedestal having a holding surface on which the base material is placed, and
A positioning unit configured to position the substrate at a predetermined holding position on the holding surface, and a positioning unit.
It is provided with a suction unit configured to suck the base material positioned at the predetermined holding position on the pedestal.
The positioning unit is
A first pressing unit configured to press the substrate against the pedestal,
An outer edge contact member provided on the pedestal and configured to come into contact with a part of the outer edge of the base material.
A base material holding device including a second pressing unit configured to press the outer edge of the base material to bring the base material into contact with the outer edge contact member. The base material holding device according to claim 1, wherein the first pressing unit includes a plurality of main surface contact members configured to come into contact with the main surface of the base material. The base material holding device according to claim 2, wherein the first pressing unit further includes an advance / retreat control unit configured to independently advance / retreat the plurality of main surface contact members from the pedestal. The base material holding device according to claim 2 or 3, wherein the main surface contact member is a sphere. The base material holding device according to claim 4, wherein the first pressing unit further includes a sphere holding unit configured to rotatably hold the sphere. The base material holding device according to any one of claims 1 to 5, further comprising a frictional force reducing unit for reducing the frictional force between the base material and the pedestal. The base material holding device according to any one of claims 1 to 6, wherein the height from the holding surface of the outer edge contact member is set to be equal to or lower than the thickness of the base material. The base material holding device according to any one of claims 1 to 7, wherein the holding surface has a curved surface. The base material holding device according to any one of claims 1 to 7, wherein the holding surface is a flat surface. The base material holding device according to any one of claims 1 to 9, further comprising a heating unit configured to heat the base material placed on the holding surface. A curved screen printing device that prints a predetermined pattern on a plate-shaped substrate having a curved surface.
The base material holding device according to claim 7 and
Screen version and
A squeegee arranged above the screen plate and configured to apply ink to the base material held by the base material holding device via the screen plate.
A curved screen printing apparatus including a print control unit configured to print the predetermined pattern on the substrate by relatively moving the pedestal of the substrate holding device, the screen plate, and the squeegee. .. It is a base material holding method for holding a plate-shaped base material.
The base material is placed on the holding surface of the pedestal, and the base material is placed on the holding surface of the pedestal.
The base material is pressed against the pedestal, and the base material is pressed against the pedestal.
By pressing the outer edge of the base material pressed against the pedestal and bringing it into contact with the outer edge contact member that contacts a part of the outer edge of the base material, the base material is placed in a predetermined holding position on the holding surface. Position and
A base material holding method in which the base material pressed by the pedestal and positioned at the predetermined holding position is adsorbed on the pedestal. When pressing the outer edge of the base material, the base material is pressed against the pedestal with the first pressing force.
The base material holding method according to claim 12, wherein when the base material is adsorbed on the holding surface, the base material is pressed against the pedestal with a second pressing force larger than the first pressing force. The substrate holding method according to claim 12 or 13, wherein the holding surface has a curved surface. The substrate holding method according to claim 12 or 13, wherein the holding surface is a flat surface. The base material holding method according to any one of claims 12 to 15, wherein the base material has a curved surface. The base material holding method according to any one of claims 12 to 15, wherein the base material is a flat plate. The base material holding method according to any one of claims 12 to 17, wherein the base material placed on the holding surface is heated.

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