JP2017226182A - Screen printer and screen printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printer and a screen printing method which can improve snap-off properties of a screen printing plate after printing and form a high-definition pattern on a base material.SOLUTION: A screen printer includes: a stage 2 which holds a base material 14; a screen printing plate 4 which is formed of a material having flexibility and is stuck in a flat state at a position separated from a printing surface 14a of the base material 14; a squeegee 21 which moves along the printing surface 14a of the base material 14 in a state in which the squeegee is in contact with the base material 14 via the screen printing plate 4 and transfers ink supplied to one surface of the screen printing plate 4 to the base material 14; and a printing plate height position adjustment air cylinder (printing plate height position adjustment means) 27 which moves a rear end of the screen printing plate 4 located on an upstream side in a direction in which the squeegee 21 moves during transfer in a direction separated from the stage 2.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a screen printing machine and a screen printing method having a configuration in which the release property of a screen plate is improved.

As a conventional screen printer, for example, there is one described in Patent Document 1. The screen printer disclosed in Patent Document 1 adopts a configuration capable of performing screen printing with a uniform attack angle even on a bent base material. The attack angle is the angle of the squeegee with respect to the surface of the substrate. In screen printing, a change in the attack angle of the squeegee leads to a change in the printing pressure for extruding ink from the screen plate. If the printing pressure changes, the print quality becomes unstable.
In recent years, screen printing is increasingly used to form high-definition patterns such as printed circuits on circuit boards.

JP 2010-284874 A

  In the screen printing machine shown in Patent Document 1, the screen plate is in close contact with the base material even after the squeegee passes (no plate separation), and the pattern on the base material is likely to bleed and form a high-definition pattern. was difficult.

  The present invention has been made to solve such a problem, and a screen printing machine and a screen printing capable of forming a high-definition pattern on a base material by improving the release property of a screen plate after printing. It aims to provide a method.

  In order to achieve this object, a screen printing machine according to the present invention is provided with a stage for holding a substrate that is a substrate to be printed, and a pattern hole that is formed of a flexible material and includes a printing pattern. A screen plate stretched in a flat state at a position away from the printing surface of the substrate on the stage, and moves along the printing surface of the substrate in contact with the substrate through the screen plate, A squeegee for transferring the ink supplied to one surface of the screen plate to the substrate, and a plate height for moving the end of the screen plate located upstream of the direction in which the squeegee moves during transfer in a direction away from the stage. And a position adjusting means.

  According to the present invention, in the screen printing machine, the plate height position adjusting unit may move the end portion of the screen plate in a direction approaching the stage at a predetermined timing.

  The screen printing method according to the present invention includes an ink supply step in which an ink film is formed by a scraper on a screen plate stretched in a flat state at a position spaced from the printing material, and a squeegee is a printing material through the screen plate. Printing that moves the end portion of the screen plate located upstream of the moving direction of the squeegee in a direction away from the stage while performing a transfer operation that moves along the printing surface of the substrate while in contact with the material. And a step.

  In the screen printing machine according to the present invention, the plate height position adjusting means moves the edge of the screen plate in a direction away from the stage during printing, so that the portion of the screen plate where the squeegee has passed is separated from the substrate. A force that biases in the direction acts. For this reason, the stencil release property is improved and the pattern on the base material is prevented from bleeding.

  Therefore, according to the present invention, since the force for separating the screen plate from the base material during printing is increased and the plate separation is promoted, a screen printer capable of forming a high-definition pattern on the base material is provided. be able to.

It is a top view which shows the structure of the screen printer concerning this invention. It is a side view of a screen printer. It is a side view of the screen printer for demonstrating the range which can move a squeegee and a scraper. It is a top view of a stage and a stage drive device. It is a side view of a stage and a stage drive device. In FIG. 5, the screen version is drawn with a two-dot chain line. It is a side view of a squeegee and a scraper showing the supporting frame in a broken state. 6 is a position indicated by a VI-VI line in the upper part of the printing press in FIG. FIG. 2 is a rear view of the scraper and the stage as seen from the direction of arrow A in FIG. 1. FIG. 7 also shows a part of the stage driving device. FIG. 2 is a front view of the squeegee as viewed from the direction of arrow B in FIG. In FIG. 8, a stage and a part of the stage driving device are also drawn. It is a schematic diagram which shows the state at the time of ink supply. It is a schematic diagram which shows the state at the time of a printing start. It is a schematic diagram which shows the state which the squeegee is located in the center part of the printing surface after the printing start. It is a schematic diagram which shows the state which has lifted up the one end part of the screen plate. It is a block diagram which shows the structure of a control system. It is a flowchart for demonstrating the screen printing method.

Hereinafter, an embodiment of a screen printing machine according to the present invention will be described in detail with reference to FIGS.
A screen printing machine 1 shown in FIG. 1 includes a stage 2 drawn at the left end in FIG. In this embodiment, the left side in FIG. 1 will be described as the rear side of the screen printing machine 1, and the right side in FIG. In this embodiment, the vertical direction in FIG. 1 will be described as the horizontal direction of the screen printer 1.

The screen printing machine 1 includes a base material support unit 3 having a stage 2 and a printing unit 5 including a screen plate 4 positioned above the base material support unit 3.
The base material support unit 3 includes a base 6 and a stage driving device 7 supported by the base 6.
The stage driving device 7 reciprocates the stage 2 between a base material attaching / detaching position shown in FIG. 1 and a printing position below the printing unit 5 shown in the center of FIG.

  As shown in FIG. 4, the stage driving apparatus 7 according to this embodiment includes a support plate 8 that is horizontally supported by a base 6, a pair of slide rails 9 provided on the support plate 8, and a stage. 2 is configured by a ball screw shaft 11 that is screwed into a nut portion 10 provided in 2, a motor 12 that drives the ball screw shaft 11, and the like. The slide rail 9 and the ball screw shaft 11 extend in the front-rear direction of the screen printing machine 1. As shown in FIG. 7, the stage 2 is supported on the slide rail 9 via a slider 13 so as to be movable in the front-rear direction.

  On the upper surface of the stage 2, a holding surface 15 (see FIGS. 4 and 5) for holding the base material 14 (see FIGS. 1 and 2) as a substrate to be stacked is formed, and a number of suctions are formed. The hole 16 is open. As shown in FIGS. 2 and 5, the holding surface 15 is a concave curved surface that is curved so as to be recessed downward. This concave curved surface is a uniaxial direction formed from the front-rear direction of the screen printing machine 1 and is curved in the moving direction of a squeegee 21 (see FIG. 1) described later. For this reason, the height of the holding surface 15 gradually decreases from the rear end of the holding surface 15 toward the intermediate portion, and gradually increases from the intermediate portion toward the front end portion.

  Although not shown in detail, the suction hole 16 is connected to a suction device 22 (see FIG. 13) and sucks air in a state where the base material 14 is superimposed on the holding surface 15. For this reason, the base material 14 is attracted and held by the holding surface 15, and is curved following the holding surface 15. As the base material 14, a flexible board material for forming a circuit board having a film shape or a sheet shape can be used.

As shown in FIG. 1, the printing unit 5 includes a screen plate 4 positioned near the upper side of the stage driving device 7, a scraper 23 and a squeegee 21 positioned above the screen plate 4, and the scraper 23 and the squeegee 21. Is configured by a printing unit driving device 24 or the like that drives the printer in the horizontal direction.
The screen plate 4 is formed by a thin plate having flexibility, and is provided with a pattern hole 4a made of a printing pattern. Only a part of the pattern hole 4a shown in FIG. 1 is schematically drawn. The screen plate 4 is held flat by a frame member 25 surrounding the screen plate 4 and supported by the base 6 at the front end portion and the rear end portion.

  As shown in FIG. 2, the front end portion of the frame member 25 is swingably supported by the base 6 via a support shaft 26. The support shaft 26 extends in the left-right direction of the screen printing machine 1. The rear end portion of the frame member 25 is supported by the base 6 via a plate height position adjusting air cylinder 27. The plate height position adjusting air cylinders 27 are installed in a state in which they are oriented in the vertical direction, and are provided at both ends of the frame member 25 in the horizontal direction. As the air cylinders 27 extend, the rear end of the screen plate 4 rises. The operation amount of the plate height position adjusting air cylinder 27 is controlled by the control device 28 (see FIG. 13), and increases or decreases in accordance with the movement amount of the squeegee 21 during printing. When the air cylinder 27 extends from the initial state, the screen plate 4 is inclined downward from the horizontal state as indicated by a two-dot chain line in FIG. In this embodiment, the plate height position adjusting air cylinder 27 corresponds to the “plate height position adjusting means” in the present invention.

The scraper 23 is for spreading the ink 31 (see FIG. 9) on the screen plate 4. The ink 31 can use a conductive paste for circuit formation. The scraper 23 according to this embodiment is supported by a first beam 32 extending in the left-right direction above the screen plate 4 via a first lifting mechanism 33, as shown in FIGS. Yes.
As shown in FIG. 1, the first beam 32 is formed to have a length that protrudes in the left-right direction from the screen plate 4. Scraper support plates 34 are fixed to both left and right ends of the first beam 32. The first beam 32 and the scraper support plate 34 constitute a part of a printing unit driving device 24 described later. The scraper 23 is supported on the base 6 via the first lifting mechanism 33 and the printing unit driving device 24.

  As shown in FIG. 7, the first elevating mechanism 33 includes a first bracket 36 that is supported on the first beam 32 by a pair of left and right guide devices 35 so as to be movable in the vertical direction, and the guide devices 35. And a first air cylinder 37 connected to the first bracket 36. The scraper 23 is detachably attached to the first bracket 36 by a screw 38 with a handle. In this embodiment, the first bracket 36 is provided with a notch 36 a so that the scraper 23 can be detached from the first bracket 36 together with the handle screw 38 by loosening the handle screw 38. .

  As shown in FIG. 6, the guide device 35 includes a bearing member 35a fixed to the first beam 32, a guide rod 35b penetrating the bearing member 35a in the vertical direction, and the like. The lower end portion of the guide rod 35 b is fixed to the first bracket 36. A stopper 35c that restricts the downward movement of the guide rod 35b by contacting the bearing member 35a is provided at the upper end of the guide rod 35b. The stopper 35c moves in the vertical direction with respect to the guide rod 35b by turning the knob 35d at the upper end. That is, the guide device 35 has a function of supporting the first bracket 36 (scraper 23) so as to be movable in the vertical direction and a function of adjusting a stop position when the first bracket 36 moves downward. ing. For this reason, for example, by turning the knob 35d of one guide device 35, the inclination angle of the scraper 23 in the left-right direction changes.

The first air cylinder 37 has a function of raising and lowering the first bracket 36 and the scraper 23 between two positions in the vertical direction described later. These positions are, as shown by a two-dot chain line in FIG. 9, a retreat position where a wide space for printing is formed between the scraper 23 and the screen plate 4, and as shown by a thick line in FIG. This is the application position when the ink 31 is applied to the screen plate 4.
The operation of the first air cylinder 37 is controlled by the control device 28.

  The squeegee 21 is for screen printing. As shown in FIGS. 1, 6 and 8, the squeegee 21 is provided with a second beam 41 extending in the left-right direction above the screen plate 4 via a second lifting mechanism 42. It is supported. As shown in FIG. 1, the second beam 41 is formed to have a length that protrudes in the left-right direction from the screen plate 4. Squeegee support plates 43 are fixed to both ends of the second beam 41 in the left-right direction. The second beam 41 and the squeegee support plate 43 constitute a part of the printing unit driving device 24 described later. The squeegee 21 is supported on the base 6 via the second lifting mechanism 42 and the printing unit driving device 24.

  As shown in FIG. 8, the second elevating mechanism 42 includes a second bracket 44 that is supported on the second beam 41 by a pair of left and right guide devices 35 so as to be movable in the vertical direction, and the guide devices 35. And a second air cylinder 45 connected to the second bracket 44. The guide device 35 for supporting the squeegee 21 is equivalent to the above-described guide device 35 for supporting the scraper.

  The squeegee 21 is formed in a plate shape by an elastic material such as rubber, and is detachably attached to the second bracket 44 by a screw 46 with a handle. In this embodiment, the second bracket 44 is provided with a notch 44 a so that the squeegee 21 can be detached from the second bracket 44 together with the handle screw 46 by loosening the handle screw 46. . Further, the second bracket 44 includes an attachment structure that can change the attachment angle in the front-rear direction of the squeegee 21. The squeegee 21 can swing backward about the screw member 47 by loosening the screw members 47 provided at both ends of the second bracket 44. The squeegee 21 thus swung is indicated by a two-dot chain line in FIG. The squeegee 21 can be moved in the vertical direction by the operation of the second air cylinder 45 even when the mounting angle is changed in this way.

Further, the inclination angle of the squeegee 21 in the left-right direction can be adjusted by turning the knob 35d at the upper end of the guide device 35 to change the lowering positions of the left and right sides of the second bracket 44.
The second air cylinder 45 has a function of raising and lowering the second bracket 44 and the squeegee 21 between two positions in the vertical direction described later. These positions include a retracted position located above the screen plate 4 as indicated by a two-dot chain line in FIG. 10 and a printing position for pressing the screen plate 4 against the substrate 14 as indicated by a solid line in FIG. It is. The operation of the second air cylinder 45 is controlled by the control device 28.
The magnitude of the pressing force when the squeegee 21 presses the screen plate 4 against the substrate 14 is controlled by changing the pressure of the compressed air supplied to the second air cylinder 45.

  As shown in FIG. 1, the printing unit driving device 24 drives the squeegee 21 and the scraper 23 in the front-rear direction using a driving motor 51 located at the front end of the screen printer 1 as a driving source. The drive motor 51 is supported by the base 6 with the rotating shaft 52 extending in the left-right direction. Drive-side pulleys 53 are attached to both ends of the rotary shaft 52, respectively. A driven pulley 54 is provided behind the driving pulley 53 and in the vicinity of the rear end portion of the screen plate 4 as viewed from above.

  The driven pulley 54 and the driving pulley 53 described above are rotatably supported by subframes 55 provided on the left and right sides of the base 6. A belt 56 is wound around the driving pulley 53 and the driven pulley 54. A driving plate 57 is attached to the upper portion of the belt 56. As shown in FIG. 2, the driving plate 57 is supported by a linear guide rail 58 extending in the front-rear direction via a slider 59 so as to be movable in the front-rear direction. The straight guide rail 58 is supported by the subframe 55 in a state of extending horizontally in the front-rear direction. The above-described scraper support plate 34 is fixed to the drive plate 57.

The scraper support plate 34 is connected to the squeegee support plate 43 through a connecting piece 60. The connecting piece 60 is rotatably connected to the scraper support plate 34 and the squeegee support plate 43, respectively.
Therefore, the power of the drive motor 51 is transmitted from the rotary shaft 52 to the scraper support plate 34 via the drive pulley 53, the belt 56, and the drive plate 57, and from the scraper support plate 34 to the connecting piece. It is also transmitted to the squeegee support plate 43 via 60. This driving force acts as a thrust force urging the scraper support plate 34 and the squeegee support plate 43 in the front-rear direction.

  The squeegee support plate 43 rotatably supports the four rollers 61. Of the four rollers 61, two rollers 61 are arranged vertically at the front end of the squeegee support plate 43, and the other two rollers 61 are arranged vertically at the rear end of the squeegee support plate 43. Are lined up. Among these rollers 61, a curved guide rail 62 is sandwiched between the upper two rollers 61 and the lower two rollers 61.

As shown in FIG. 2, the curved guide rail 62 has an arcuate shape that protrudes downward when viewed from the side, and is formed in a shape that curves in a uniaxial direction that includes the moving direction of the squeegee 21. . As shown in FIG. 1, the curved guide rail 62 is supported by the base 6 so as to extend in the front-rear direction in parallel with the straight guide rail 58 as viewed from above. The position of the curved guide rail 62 in the left-right direction is inside the printing press from the straight guide rail 58.
The curvature of the curved guide rail 62 desirably matches the curvature of the holding surface 15 of the stage 2. However, since the curvature of the holding surface 15 may vary depending on the flexibility of the base material 14, the curvature of the curved guide rail 62 and the curvature of the holding surface 15 do not necessarily match.

  Since the squeegee support plate 43 is supported by the curved guide rail 62 via the four rollers 61, the thrust in the front-rear direction, which is the power of the drive motor 51, moves the connecting piece 60 from the scraper support plate 34. As shown in FIG. 3, it moves along the curved guide rail 62 between the rear end portion and the front end portion of the curved guide rail 62. Since the squeegee support plate 43 is connected to the scraper support plate 34 via the connecting piece 60, the squeegee support plate 43 (squeegee 21) and the scraper support plate 34 (scraper 23) move together. . Although two sets of the scraper support plate 34 and the squeegee support plate 43 are depicted in FIG. 3, only one set is actually provided.

  As apparent from FIG. 3, the scraper 23 is driven by the printing unit driving device 24 to move horizontally in the front-rear direction along the straight guide rail 58. Further, the squeegee 21 moves along the curved guide rail 62 so as to correspond to the holding surface 15 of the stage 2.

Next, the screen printing method by the screen printer 1 including the configuration of the control device 28 will be described with reference to the flowcharts shown in FIGS. In performing screen printing, first, the stage carry-in step S1 of the flowchart of FIG. 14 is performed.
In the stage carry-in step S1, first, the base material 14 is placed on the holding surface 15 of the stage 2 by the operator. This operation is performed in a state where the stage 2 is positioned at the base material attaching / detaching position. In this state, the screen printer 1 starts the stage carry-in operation by the operator operating the stage carry-in switch 71 (see FIG. 13) of the control device 28.

  When the stage carry-in switch 71 is operated, the control device 28 first operates the suction device 22 to adsorb the base material 14 to the stage 2. At this time, the control device 28 operates the driving motor 51 of the printing unit driving device 24 to move the scraper 23 and the squeegee 21 to the positions of the front end portions of the linear guide rail 58 and the curved guide rail 62. And the control apparatus 28 operates the 1st air cylinder 37 and the 2nd air cylinder 45, and moves the scraper 23 and the squeegee 21 to a retracted position, respectively.

Next, the control device 28 operates the motor 12 of the stage driving device 7 to move the stage 2 to the printing position. After the stage 2 moves in this way, the process proceeds to the ink supply step S2.
In the ink supply step S2, first, the operator supplies the ink 31 onto the screen plate 4 and operates the ink supply switch 72 (see FIG. 13). The ink 31 is supplied near the lower portion of the scraper 23. After the ink supply switch 72 is operated, the control device 28 operates the first air cylinder 37 to lower the scraper 23 to the application position. Then, as shown in FIG. 9, the control device 28 operates the printing unit driving device 24 to move the scraper 23 and the squeegee 21 to the positions of the rear end portions of the linear guide rail 58 and the curved guide rail 62. At this time, the scraper 23 moves parallel to the screen plate 4 and spreads the ink 31 on the screen plate 4 to form an ink film. Such parallel movement of the scraper 23 is realized by the straight guide rail 58.

Thereafter, the control device 28 operates the first air cylinder 37 to move the scraper 23 to the retracted position. After the scraper 23 has moved in this way, the process proceeds to printing step S3.
In the printing step S3, first, the control device 28 operates the second air cylinder 45 to move the squeegee 21 to the printing position as shown in FIG. At this time, the squeegee 21 presses the screen plate 4 against the base material 14 with a predetermined pressing force. That is, the squeegee 21 comes into contact with the base material 14 via the screen plate 4. At this time, the screen plate 4 is pressed by the squeegee 21 from a position spaced upward from the printing surface 14a of the substrate 14, and is pressed against the printing surface 14a against its own tension.

  Next, the control device 28 operates the printing unit driving device 24 to move the scraper 23 and the squeegee 21 to the positions of the front end portions of the linear guide rail 58 and the curved guide rail 62. At this time, as shown in FIG. 11, the squeegee 21 moves along the curved printing surface 14 a of the substrate 14 at a substantially constant attack angle A. Here, the “attack angle” is an angle formed between the angle of the printing surface 14 a of the substrate 14 and the squeegee 21. The movement of the squeegee 21 along the shape of the printing surface 14 a of the base material 14 at a substantially constant attack angle is realized by the curved guide rail 62.

As the squeegee 21 moves in the horizontal direction, the ink 31 that has entered the pattern holes 4 a of the screen plate 4 is transferred to the substrate 14. The portion of the screen plate 4 after the squeegee 21 passes is separated from the printing surface 14a by its own tension.
Since the printing surface 14a of the base material 14 is curved, the amount of deformation of the screen plate 4 is reduced during printing compared to the case where the printing surface 14a is flat. That is, the space between the screen plate 4 and the printing surface 14a before being pressed by the squeegee 21 is such that the rear end portion (left end portion in FIG. 10) and the printing start side end portion from the center of the printing surface 14a and the printing. It becomes narrower gradually toward the front end that is the end side end. A narrow interval means that the amount of deformation of the screen plate 4 during printing is small.

  The screen plate 4 is difficult to be separated from the base material 14 because the viscosity of the ink 31 is high or the thickness of the base material 14 is thin (the separation of the plate is deteriorated). Thus, when it becomes difficult to separate the screen plate 4 from the base material 14, the rear end part of the screen plate 4 is lifted by the air cylinder 27 as shown in FIG. That is, the rear end portion of the screen plate 4 is separated from the stage 2 while performing a transfer operation in which the squeegee 21 moves along the printing surface 14 a of the substrate 14 in a state where the squeegee 21 is in contact with the substrate 14 via the screen plate 4. Move in the direction. The rear end portion of the screen plate 4 is the end portion of the screen plate 4 located on the upstream side in the direction in which the squeegee 21 moves during transfer. The amount by which the screen plate 4 is raised by the air cylinder 27 increases according to the amount of movement of the squeegee 21. For this reason, the rear end portion of the screen plate 4 gradually rises following the advance of the squeegee 21.

  When the screen plate 4 is inclined downward in this way, the force for pulling up the screen plate 4 is increased, and the plate separation is improved. When the screen plate 4 is tilted in this way, the rear end portion of the screen plate 4 is lowered (closer to the initial position before ascending) at a predetermined timing, for example, a timing past the intermediate point of the printing surface 14a. The reason for lowering the rear end portion of the screen plate 4 in this way is to prevent the rear side of the screen plate 4 from being pulled excessively and reducing the accuracy of the pattern. At this time, as in the case of raising the rear end portion of the screen plate 4, the rear end portion gradually descends according to the movement amount of the squeegee 21.

After the squeegee 21 has moved to the front end of the screen plate 4, the control device 28 operates the second air cylinder 45 to move the squeegee 21 to the retracted position. After the squeegee 21 moves in this way, the process proceeds to the stage carry-out step S4.
In the stage carry-out step S4, the control device 28 operates the stage driving device 7 to move the stage 2 to the base material attaching / detaching position, and then stops the suction device 22. Thus, the printing operation is completed when the suction device 22 stops.

In the screen printing machine 1 and the screen printing method configured as described above, the screen plate 4 is lifted by the air cylinder 27 when the screen plate 4 is difficult to be separated from the base material 14 during printing. The force which pulls up the part which the squeegee 21 in 4 passed has increased. For this reason, the separation of the plate is promoted, and the pattern on the base material is prevented from bleeding.
Therefore, according to this embodiment, since the force for separating the screen plate from the base material during printing is increased and the plate separation is promoted, a screen printer capable of forming a high-definition pattern on the base material and A screen printing method can be provided.

  Also, the plate height position adjusting air cylinder 27 according to this embodiment moves the rear end of the screen plate in the direction approaching the stage 2 at a predetermined timing after lifting the rear end of the screen plate 4. Let For this reason, since the rear end portion of the screen plate 4 is not lifted excessively, the elongation of the screen plate 4 is suppressed, and the pattern can be transferred with high accuracy. Therefore, according to this embodiment, it is possible to provide a screen printer capable of printing a higher definition pattern.

  In the screen printing machine 1 according to this embodiment, the squeegee 21 moves along the curved printing surface 14a of the substrate 14 at a substantially constant attack angle. Further, since the portion of the screen plate 4 after the squeegee 21 passes is separated from the printing surface 14a by its own tension, the separation of the plate is improved. Therefore, according to this embodiment, since the attack angle is constant and the plate separation is good and the printing accuracy is high, a screen printing machine capable of forming a high-definition pattern on the substrate 14 is provided. Can be provided.

The screen printing machine 1 according to this embodiment includes a scraper 23 that moves in parallel with the screen plate 4 to form an ink film on the screen plate 4.
For this reason, since an ink film having a constant film thickness is formed on the screen plate 4, it is possible to print a higher definition pattern.

The screen printing machine 1 according to this embodiment includes a printing unit driving device 24 (guide configuration) that causes the squeegee 21 to move in a curved line and the scraper 23 to move linearly with the power of the same driving source (driving motor 51). . The curved guide rail 62 realizes the curved movement of the squeegee 21, that is, the movement of the squeegee 21 along the shape of the printing surface 14 a at a substantially constant attack angle. The parallel movement of the scraper 23 is realized by the straight guide rail 58.
For this reason, according to this embodiment, even though the squeegee 21 and the scraper 23 having different motion modes are provided, they can be driven by the power of one power source, so that the screen printing machine with low manufacturing cost is provided. Can be provided.

  In the above-described embodiment, a configuration is adopted in which the squeegee 21 and the scraper 23 are driven in the horizontal direction using one drive motor 51 as a power source. However, the present invention is not limited to such a limitation, and the squeegee 21 and the scraper 23 can be individually driven by a driving device using, for example, a servo motor as a power source. An electric actuator can be used to adjust the angle of the squeegee 21.

  DESCRIPTION OF SYMBOLS 1 ... Screen printer, 2 ... Stage, 4 ... Screen plate, 4a ... Pattern hole, 14 ... Base material, 15 ... Holding surface, 21 ... Squeegee, 23 ... Scraper, 27 ... Air cylinder for plate height position adjustment (plate) Height position adjusting means).

Claims (3)

A stage for holding a base material to be printed;
A screen plate formed of a flexible material and provided with a pattern hole made of a printing pattern, and stretched in a flat state at a position spaced from the printing surface of the substrate on the stage;
A squeegee that moves along the printing surface of the substrate in contact with the substrate via the screen plate, and transfers the ink supplied to one surface of the screen plate to the substrate;
A screen printing machine, comprising: a plate height position adjusting means for moving an end portion of the screen plate located upstream in a moving direction of the squeegee in a direction away from the stage. The screen printing machine according to claim 1.
The screen printing machine, wherein the plate height position adjusting means moves the end portion of the screen plate in a direction approaching the stage at a predetermined timing. An ink supply step of forming an ink film with a scraper on a screen plate stretched in a flat state at a position spaced from the substrate;
The edge of the screen plate located on the upstream side in the moving direction of the squeegee while performing the transfer operation of moving along the printing surface of the substrate while the squeegee is in contact with the substrate to be printed via the screen plate And a printing step of moving the printing unit in a direction away from the stage.

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