WO2021111500A1 - Screen printing device and screen printing method - Google Patents

Abstract

A screen printing device (100) is provided with: a moving table (150) that has a plurality of workpiece mounting units (30) about a table shaft (156) and rotates about the table shaft (156); a printing unit (60) that performs printing on workpieces (69) mounted on the plurality of workpiece mounting units (30) from the inside to the outside in a radial direction; and a control unit (110) that causes the moving table (150) to rotate forward and backward to perform printing by the printing unit (60). The control unit (110), after rotating the moving table (150), starts unloading of the workpieces (69) on the workpiece mounting units (30) and the printing on the workpieces (69) in the printing unit (60) simultaneously.

Description

Screen printing device and screen printing method

The present invention relates to, for example, a screen printing device, a belt driving device, and a method thereof.

Conventionally, a device for printing by placing a work on an annular belt has been considered.

Japanese Unexamined Patent Publication No. 10-175289 Japanese Unexamined Patent Publication No. 2017-23737

The present invention provides a screen printing apparatus and a screen printing method with improved printing accuracy.

The screen printing apparatus of the present invention
A moving table that has multiple workpiece mounting parts centered on the table axis and rotates around the table axis,
A printing unit that prints from the inside to the outside in the radial direction with respect to the workpieces mounted on the plurality of workpiece mounting portions.
A control unit that rotates the moving table in the forward and reverse rotations and executes printing by the printing unit is provided.

According to the present invention, printing in the radial direction does not apply a rotational force to the table shaft, so that printing accuracy is improved.

The front view of the screen printing apparatus 100 in Embodiment 1. FIG. AA sectional view of the screen printing apparatus 100 according to the first embodiment. The front view of the base 50 and the moving table 150 in Embodiment 1. FIG. AA sectional view of the base 50 and the moving table 150 in the first embodiment. The block diagram of the removal part 90 of the screen printing apparatus 100 in Embodiment 1. FIG. (A) is a front view, and (b) is a BB sectional view. FIG. 5 is a flow chart of a screen printing method according to the first embodiment. The front view of the screen printing apparatus 100 in Embodiment 2. FIG. The schematic block diagram of the belt moving mechanism 40 and the driving mechanism 70 in Embodiment 3. FIG. (A) is a diagram in which the drive roller 73 is fixed to the rotation shaft of the motor 71, (b) is a diagram in which the transmission roller 46 is fixed to the rotation shaft of the belt roller 42, and (c) is a diagram in which the transmission roller 46 is fixed to the rotation shaft of the motor 71. The figure which fixed the drive roller 73 and fixed the transmission roller 46 to the rotating shaft of a belt roller 42. FIG. 6 is a schematic configuration diagram of a drive unit 170 and a position moving unit 180 according to the fourth embodiment. (A) is a configuration diagram of a drive unit 170 and a position moving unit 180, and (b) is a configuration diagram of a drive unit 170 and a position moving unit 180. The front view of the screen printing apparatus 100 in Embodiment 5. AA sectional view of the screen printing apparatus 100 according to the fifth embodiment. The front view of the base 50 and the moving table 150 in Embodiment 5. AA sectional view of the base 50 and the moving table 150 in the fifth embodiment. FIG. 6 is a schematic configuration diagram of a drive unit 170 and a position moving unit 180 according to the sixth embodiment. The front view of the base 50 and the moving table 150 in Embodiment 7. FIG. AA sectional view of the base 50 and the moving table 150 in the seventh embodiment. The flow chart of the screen printing method in Embodiment 8. The block diagram of the hot air supply part 300 of the screen printing apparatus 100 in Embodiment 1. FIG. (A) is a front view, and (b) is a BB sectional view. The block diagram of the upper surface of the hot air blower 303 of the screen printing apparatus 100 in Embodiment 1. FIG. (A) is a grid-shaped diagram, and (b) is a box-shaped diagram.

Embodiment 1.
*** Explanation of configuration ***
The configuration of the screen printing device 100 using the belt driving device 200 will be described with reference to FIGS. 1 to 5.
The screen printing device 100 of FIGS. 1 to 5 is a device in which a work 69 is placed on an annular belt 41 and screen printing is performed by screen plate making.
The belt driving device 200 has a belt moving mechanism 40, a driving mechanism 70, and a control unit 110 described below.
In FIG. 1, the direction in which the annular belt 41 moves left and right is referred to as a left-right lateral direction. The height direction is called the vertical direction.
Further, the bottom of the paper in FIG. 2 is referred to as the front direction, and the top of the paper is referred to as the rear direction. The printing direction is the front-back direction.

<< Work 69 >>
The work 69 is a rectangular flat plate. Specific examples of the material of the work 69 are glass, resin, plastic, paper, cloth, and metal.

<< Control unit 110 >>
The screen printing device 100 has a control unit 110.
The control unit 110 controls the entire device.
The control unit 110 can be realized by a central processing unit, a program, and a memory. The memory has a first memory and a second memory. The signal from the control unit 110 is transmitted to each unit described below by the signal line 111. The operation described below can be realized by the control unit 110 transmitting a command by the signal line 111.

<< Base 50 >>
The screen printing device 100 has a base 50.
The base 50 houses the control unit 110 and the signal line 111, and further installs and stores drive devices such as a power supply device, a pump device, a robot cylinder, a linear guide, and a suction device 96 (not shown).
The base 50 has four upper and lower pillars 51. The upper and lower pillars 51 are moved up and down by a cylinder inside the base 50. Two beam frames 52 are fixed on the upper and lower columns 51 in the front-rear direction.
On the left side of the base 50, there is a carry-in device 155 for carrying in the work 69, and on the right side of the base 50, there is a carry-out device 157 for carrying out the work 69.

<< Moving table 150 >>
The moving table 150 has a plurality of workpiece mounting portions 30 centered on the table shaft 156, and rotates around the table shaft 156.
As shown in FIGS. 3 and 4, a bottom plate 153 of the moving table 150 is rotatably attached to the center of the base 50 by a table shaft 156. The moving table 150 is a turntable that rotates under the control of the control unit 110.
The table surface 151 of the moving table 150 is on the same plane as the upper surface of the annular belt 41.
The front and rear of the moving table 150 are notched in a U shape in a plan view, and two work mounting portions 30 are arranged in the notched portions. The two work mounting portions 30 are arranged on a straight line about the table shaft 156.
Hereinafter, one of the two work mounting portions 30 is referred to as a first work mounting portion 30, and the other is referred to as a second work mounting portion 30.
A belt moving mechanism 40 is arranged on the work mounting portion 30.
The moving table 150 has an installation portion 152 at the center of the table surface 151. The installation portion 152 is a rectangular portion that is one step lower than the table surface 151. A rectangular fixing plate 99 orthogonal to the installation portion 152 is installed in the installation portion 152 in the front-rear direction.
The fixing plate 99 is like a balance pole attached with the belt moving mechanism 40 hung on both sides. However, the fixing plate 99 is not deformed, and the position of the belt moving mechanism 40 is not changed up and down.
There are suction portions 55 on both sides of the upper surface of the fixing plate 99. A plurality of suction grooves 57 are arranged in the suction portion 55. A suction pipe 56 is connected behind the suction portion 55.
A fixture 58 is fixed to the fixing plate 99 downward. The fixture 58 is a flat plate orthogonal to the fixing plate 99. The fixture 58 has a long F-shape when viewed from the front, and has bearings at both ends that receive a rotating shaft. Further, there is a bearing having two arms extending downward and receiving a rotation shaft at the tips of the two arms.
The fixtures 58 are fixed at a total of four locations, both sides of the installation portion 152 and both ends of the fixing plate 99. The pair of fixtures 58 are arranged in parallel on both sides of the belt moving mechanism 40 described below, and attach the belt moving mechanism 40 to the moving table 150. Specifically, the fixture 58 rotatably holds the rotation shafts of various rollers of the belt moving mechanism 40.
The fixture 58 includes a micrometer 158 and a guide 159, and by adjusting the micrometer 158, the left-right position of the rotation axis of the roller of the belt moving mechanism 40 can be adjusted.

<< Belt movement mechanism 40 >>
The screen printing device 100 has a belt moving mechanism 40.
The belt moving mechanism 40 has an annular belt 41 and circulates the annular belt 41.
The belt moving mechanism 40 is rotatably attached to the base 50 by a moving table 150.
Two belt moving mechanisms 40 are provided on the base 50, and the annular belt 41 is circulatedly attached.
The height of the upper outer surface of the annular belt 41 is the same as the height of the surface of the moving table 150.
The belt moving mechanism 40 is arranged inside the outer circumference of the moving table 150. Therefore, even if the moving table 150 rotates, the belt moving mechanism 40 does not come into contact with the base 50.
In the belt moving mechanism 40 and the moving table 150, there are no parts located higher than the upper and outer surfaces of the annular belt 41.

The belt roller 42 is on the right side of the belt moving mechanism 40, and the belt roller 43 is on the left side.
The radii of the belt roller 42 and the belt roller 43 are the same, and are 30 mm or more and 50 mm or less, preferably 40 mm.
The belt roller 42 and the belt roller 43 are rotatably fixed to the fixing plate 99 of the moving table 150 by the fixture 58. The distance between the belt roller 42 and the belt roller 43 can be adjusted by adjusting the micrometer 158.
The belt roller 42 has a pulley 44 fixed to a rotating shaft, and the rotation of the pulley 44 causes the belt roller 42 to rotate.
The belt roller 43 has a pulley 45 fixed to a rotating shaft, and the rotation of the pulley 45 causes the belt roller 43 to rotate.
The belt moving mechanism 40 has a transmission roller 46.
The transmission roller 46 is rotatably fixed to the fixing plate 99 of the moving table 150 by the fixture 58.
The transmission roller 46 has a pulley 47 on the side, and the pulley 47 is rotated by the rotation of the transmission roller 46.
A transmission belt 49 is hung on the pulley 47 and the pulley 44.

<< Printing section 60 >>
The screen printing device 100 has a printing unit 60.
The printing unit 60 is arranged on the upper portion of the annular belt 41 that has been rotated and moved.
The printing unit 60 prints on the work 69 held on the surface of the annular belt 41 using ink.
As shown in FIG. 1, the printing unit 60 is arranged between the two beam frames 52.
The printing unit 60 slides from the robot cylinder housed in the beam frame 52. That is, the printing unit 60 is attached to the beam frame 52 so as to be movable in the front-rear and lateral directions.

The printing unit 60 has a printing mechanism 61 and a printing squeegee 62.
A printing squeegee 62 is attached to the lower center of the printing mechanism 61.
Below the print squeegee 62 is a screen plate making 63.
The screen plate making 63 is detachably attached to the printing mechanism 61 by the attachment mechanism 64.

<< Drive mechanism 70 >>
The screen printing device 100 has a drive mechanism 70 that circulates and moves the annular belt 41.
The drive mechanism 70 is attached to the base 50 and is attached so as to be connectable to the belt moving mechanism 40.
The control unit 110 controls the connection between the belt moving mechanism 40 and the drive mechanism 70.
The drive mechanism 70 exists in the lower part of the belt moving mechanism 40.
The drive mechanism 70 generates a driving force that circulates the annular belt 41.
The drive mechanism 70 has a drive unit 170 and a position moving unit 180.

<< Drive unit 170 of drive mechanism 70 >>
The drive unit 170 has a motor 71, a drive roller 73, and a moving seat 77.
A motor 71 is fixed to the moving seat 77, and a drive roller 73 and a tension pulley 75 are rotatably attached to the moving seat 77.
The motor 71 fixes the pulley 72 to the rotating shaft.
The drive roller 73 fixes the pulley 74 to the rotating shaft.
A transmission belt 76 is hung on the pulley 72 and the pulley 74.
The tension pulley 75 can be fixed by changing its position to the left and right with respect to the moving seat 77, and tension is applied to the transmission belt 76.

<< Positioning part 180 of drive mechanism 70 >>
The position moving unit 180 holds the driving unit 170 in a swingable manner and moves the position of the driving unit 170.
The position moving portion 180 has a fixed pillar 83 and a fixed pillar 84 fixed to the base 50.
Upper and lower cylinders 81 are attached to the fixed pillars 83.
The upper and lower pins 82 are attached to the upper and lower cylinders 81 so as to be movable up and down.
The upper part of the upper and lower pins 82 is in contact with the lower end of the moving seat 77.
The moving seat 77 is oscillatingly attached to the fixed pillar 84 by the rotating shaft 85.
The control unit 110 controls the upper and lower cylinders 81 to move the upper and lower pins 82 up and down, thereby swinging the moving seat 77 left and right with the rotation shaft 85 as the rotation axis.

<< Plate frame position adjustment unit 65 >>
The plate frame control unit 67 will be described with reference to FIG.
The plate frame control unit 67 includes a camera 66 and a plate frame position adjusting unit 65.
The camera 66 is fixed to the base 50 by a fixing portion (not shown).
The camera 66 is arranged above the work mounting portion 30.
The camera 66 captures the printed work 69 mounted on the work mounting unit 30.
The captured image is analyzed by the control unit 110.
The control unit 110 detects the print misalignment of the print pattern from the captured image and stores the misalignment amount in the memory.
The control unit 110 stores in the first memory the amount of misalignment obtained from the image of the work 69 of the first work mounting unit 30.
The control unit 110 stores in the second memory the amount of misalignment obtained from the image of the work 69 of the second work mounting unit 30.
The plate frame position adjusting portion 65 is fixed to the mounting mechanism 64.
The plate frame position adjusting unit 65 fixes the plate frame of the screen plate making 63.
The plate frame position adjusting unit 65 adjusts the installation position of the screen plate making 63.
The plate frame position adjusting unit 65 has, for example, an X-axis motor and two Y-axis motors, and can adjust the position in the three-dimensional direction of XYθ with respect to the horizontal direction.
The plate frame position adjusting unit 65 adjusts the installation position of the screen plate making 63 based on the position deviation amount transmitted from the control unit 110 so that the printing position deviation with respect to the work 69 of the print pattern is eliminated.

<< Removal part 90 >>
The removing unit 90 will be described with reference to FIG.
The removing portion 90 is arranged at the lower part of the annular belt 41.
The removing portion 90 is attached to the lower portion of the annular belt 41 so as to be movable in the vertical direction.
The removing unit 90 removes the ink 68 adhering to the annular belt 41 when the annular belt 41 is circulating.
The removing portion 90 has a scraping squeegee 91, an adhesive roller portion 910, and a solvent roller portion 920.
The upper tip of the scraping squeegee 91 exists in the entire width direction of the annular belt 41.
The scraping squeegee 91 contacts the curved surface at the end of the annular belt 41 and scrapes ink 68, dust, and the like adhering to the annular belt 41.

The removing unit 90 has two receiving rollers 98.
As shown in FIG. 2, the two receiving rollers 98 are rotatably fixed to the fixing plate 99 of the moving table 150 by the fixture 58.
The receiving roller 98 is directly above the adhesive roller portion 910 and the solvent roller portion 920, and rotates in contact with the inner surface of the annular belt 41.

The adhesive roller portion 910 has four adhesive rollers 916.
The four adhesive rollers 916 are arranged in a cross shape and are arranged in a Gatling manner.
The four adhesive rollers 916 are rotatably attached around a rotating shaft 917.
The individual adhesive rollers 916 are rotatably attached around the roller shaft 918.
An adhesive tape with the adhesive surface on the outside is wrapped around the adhesive roller 916.
The adhesive roller 916 exists in the entire width direction of the annular belt 41.
The holding portion 911 is swingably attached to the base portion 914 by a rotating shaft 912.
The rotary shaft 912 has an adhesive roller 916 rotatably attached to the rotary shaft 912.
The springs 913 are arranged on both sides of the lower end of the holding portion 911.
The springs 913 are on both sides of the rotating shaft 912 and allow the adhesive rollers 916 to face the annular belt.
The adhesive roller 916 rotates in contact with the outer surface of the annular belt 41, and adheres and removes ink 68 and dust adhering to the outer surface of the annular belt 41.
When the adhesive strength of the first adhesive roller 916 is reduced, the four adhesive rollers 916 are rotated 90 degrees around the rotation shaft 917, and the second adhesive roller 916 is used. Further, the first adhesive roller 916 is rotated around the roller shaft 918 to cut off the adhesive tape having reduced adhesive strength, and to expose a new adhesive tape.
The same applies when the adhesive strength of the second, third, and fourth adhesive rollers 916 is reduced.
These operations may be performed automatically or manually.

The solvent roller section 920 has one solvent roller 926 and a solvent reservoir 927.
The solvent roller 926 is rotatably attached.
The solvent roller 926 exists in the entire width direction of the annular belt 41.
The solvent reservoir 927 stores a solvent that dissolves the ink.
The lower part of the solvent roller 926 is immersed in the solvent in the solvent reservoir 927.
The holding portion 921 is swingably attached to the base portion 924 by a rotating shaft 922.
The rotary shaft 922 is rotatably attached with a solvent roller 926.
The springs 923 are arranged on both sides of the lower end of the holding portion 921.
The springs 923 are on both sides of the rotating shaft 922 and cause the solvent roller 926 to face the annular belt.
The upper part of the solvent roller 926 rotates in contact with the outer surface of the annular belt 41, and supplies the solvent to the ink 68 adhering to the outer surface of the annular belt 41.
The ink 68 is softened by the solvent and easily adhered by the adhesive roller 916.

The removing unit 90 has a cylinder 94 fixed to the base 50.
The cylinder 94 has pins 95 that move up and down.
The upper and lower portions 97 are fixed to the pin 95, and the upper and lower portions 97 move up and down due to the up and down of the pin 95, and as a result, the scraping squeegee 91, the adhesive roller portion 910, and the solvent roller portion 920 move up and down.

<< Hot air supply unit 300 >>
The hot air supply unit 300 will be described with reference to FIGS. 1, 2 and 18.
As shown in FIGS. 1 and 2, the hot air supply unit 300 is arranged below the printing unit 60 and the work mounting unit 30.
The hot air supply unit 300 is fixed to the base 50.
The hot air supply unit 300 includes a hot air device 301, a duct 302, a hot air blower 303, an upper / lower pin 304, and an upper / lower cylinder 305.
The hot air blower 301 has a heater and a blower, and generates hot air 306.
The duct 302 is a blower pipe that carries the hot air 306.
The hot air blower 303 is an instrument that blows hot air 306 to the annular belt 41.

As shown in FIG. 18, the hot air blower 303 has a plurality of blowout holes 307.
As shown in FIG. 19A, the hot air blower 303 is composed of a grid-shaped hollow pipe composed of a plurality of columns and a plurality of rows.
As shown in FIG. 19B, the hot air blower 303 may have a hollow box shape.

The upper and lower cylinders 305 are fixed to the base 50.
The upper and lower pins 304 are attached to the upper and lower cylinders 305 so as to be movable up and down.
The upper part of the upper and lower pins 304 is fixed to the lower end of the hot air blower 303.
The control unit 110 moves the hot air blower 303 up and down by controlling the upper and lower cylinders 305 and moving the upper and lower pins 304 up and down.
When the moving table 150 is rotated, the control unit 110 moves the hot air blower 303 downward so as not to interfere with the rotation.
The control unit 110 moves the hot air blower 303 upward at the time of printing.
At the time of printing, the control unit 110 blows hot air from the hot air blower 303 to the lower surface of the annular belt 41, and when there is ink 68 on the lower surface of the annular belt 41, the control unit 110 warms the ink 68 to prevent the ink 68 from solidifying. ..
Since the ink 68 is not solidified by the hot air supply unit 300, the removing unit 90 can easily remove the ink 68.

<< Ring belt 41 >>
The configuration of the annular belt 41 will be described with reference to FIG.
The annular belt 41 is made of a thin plate of metal such as stainless steel or steel or aluminum or alloy in an annular shape.
The outer surface of the annular belt 41 is coated with fluororesin.
V-shaped guides 411 are formed on the inner circumferences of both sides of the annular belt 41.
The V-shaped guide 411 has a trapezoidal or triangular convex portion having a cross section protruding from the inner peripheral surface of the annular belt 41.
In the case of the trapezoidal V-shaped guide 411, the height is 3 mm or more and 7 mm or less, preferably 5 mm.
In the case of the trapezoidal V-shaped guide 411, the width of the base is 3 mm or more and 7 mm or less, preferably 5 mm.
In the case of the trapezoidal V-shaped guide 411, the width of the upper side is 2 mm or more and 4 mm or less, preferably 3 mm.

V-grooves 421 are formed on the outer circumferences of both sides of the belt roller 42 and the belt roller 43.
The shape of the V-groove 421 is a shape that can accommodate the V-shaped guide 411.
The V-shaped guide 411 fits into the V-groove 421 so that the annular belt 41 does not come off.

A plurality of through holes 48 are arranged vertically and horizontally in the annular belt 41.
The through hole 48 is a tubular hole formed from the outer surface to the inner surface of the annular belt 41, and has a preferable diameter of 0.5 mm or more and 1.0 mm or less, and more preferably 0.7 mm.
The through holes 48 are regularly arranged vertically and horizontally at intervals of 10 mm or more and 15 mm or less, preferably at intervals of 13 mm.
The through hole 48 is formed on the entire surface of the annular belt 41 except for the edge portion where the V-shaped guide 411 is located.

<< Suction part 55 >>
The configuration of the suction unit 55 will be described with reference to FIG.
The suction unit 55 has a plurality of suction grooves 57 and a plurality of pressing surfaces 59.
The plurality of suction grooves 57 and the plurality of pressing surfaces 59 are alternately arranged in parallel.
The suction groove 57 is a groove extending in the left-right direction and communicates with the suction pipe 56.
The suction groove 57 is formed directly below the through holes 48 arranged in the left-right direction.
The pressing surface 59 is a flat surface in contact with the inner surface of the annular belt 41.
The length of the suction groove 57 in the left-right direction is shorter than the length of the work 69 in the left-right direction.
The distance between the two suction grooves 57 at both ends of the plurality of suction grooves 57 in the front-rear direction is shorter than the length of the work 69 in the front-rear direction.
That is, the suction groove 57 exists inside the outer shape of the work 69, and the suction groove 57 does not protrude outside the work 69.

*** Explanation of operation ***
The screen printing method of the screen printing apparatus 100 will be described with reference to FIG.
Further, in steps S15 to S18, a belt driving method of the belt driving device 200 will be described.

The following operations are executed by the control unit 110 provided in the screen printing device 100.
The screen printing device 100 has two belt moving mechanisms 40. The left side of FIG. 6 is the operation of one belt moving mechanism 40, and the right side of FIG. 6 is another belt moving mechanism 40. It is the operation of. The operations of the two belt moving mechanisms 40 are the same, and the operation timings are only shifted.
First, the case of the first work mounting portion 30, that is, the case of one belt moving mechanism 40 on the left side of FIG. 6 will be described.

First, when the power is turned on, the control unit 110 lowers the drive unit 170 by the position moving unit 180, lowers the removing unit 90, and moves the print squeegee 62 in the forward direction to move the print squeegee 62 forward. Position at the print start position. When the power is turned on, the amount of misalignment between the first memory and the second memory is zero.

Step S11a: Work setting process / suction start process The work 69 is placed on the annular belt 41 on the first work mounting portion 30 by a work loading mechanism (not shown). The work 69 is carried in from left to right as shown in FIG. The position of the work 69 is predetermined, and the work 69 is accurately positioned and placed on the annular belt 41 by the work loading mechanism.
The control unit 110 starts suction of the suction unit 55 by the suction device 96. Since the suction portion 55 sucks air from the through hole 48 arranged in the suction groove 57, the work 69 is in close contact with the outer surface of the annular belt 41, and the work 69 mounted on the annular belt 41 is not displaced and the annular belt is not displaced. It is fixed at 41. Since the suction portion 55 has a pressing surface 59 that is in close contact with the inner surface of the annular belt 41, the annular belt 41 is not deformed downward by suction.

Step S12: Table rotation step (forward rotation) / Plate frame position adjustment step At time T1, the control unit 110 rotates the moving table 150 forward by 180 degrees. Since the belt moving mechanism 40 and the suction portion 55 rotate together, the work 69 is in close contact with the outer surface of the annular belt 41 and does not shift in position due to rotation.

At time T1, the control unit 110 operates the plate frame position adjusting unit 65 according to the amount of misalignment stored in the first memory.
The control unit 110 transmits to the plate frame position adjusting unit 65 a value in which the positive and negative values of the amount of misalignment between the X-axis direction (horizontal direction) and the Y-axis direction (front-back direction) stored in the first memory are left as they are. ..
The reason why the control unit 110 transmits to the plate frame position adjusting unit 65 the positive and negative values of the displacement amount between the X-axis direction and the Y-axis direction stored in the first memory is the printing position and the imaging position. Is in a symmetrical position rotated 180 degrees around the table axis 156.
For example, when the amount of misalignment is +1 mm in the X-axis direction (for example, left), the control unit 110 instructs the screen plate making 63 to be shifted by +1 mm in the X-axis direction (for example, left).
When the amount of misalignment is +1 mm in the Y-axis direction (for example, front), the control unit 110 instructs the screen plate making 63 to be shifted by +1 mm in the Y-axis direction (for example, front).
The control unit 110 transmits to the plate frame position adjusting unit 65 a value obtained by reversing the positive and negative values of the position deviation amount in the θ-axis direction (rotation direction) stored in the first memory.
When the amount of misalignment is +1 degree in the θ-axis direction, the control unit 110 instructs the screen plate making 63 to rotate by -1 degree in the axial direction.

Step S13a: Printing process / Hot air supply process When the moving table 150 carries the work 69, the control unit 110 lowers the upper and lower columns 51 at time T1 and prints by the printing unit 60.
The control unit 110 prints while moving the print squeegee 62 from the front to the back.
The control unit 110 moves the print squeegee 62 from the print start position to the print end position.
The control unit 110 prints while moving the printing squeegee 62 from the inside to the outside in the radial direction about the table shaft 156.
The control unit 110 prints while moving the print squeegee 62 on the moving table 150 in a direction orthogonal to the rotation direction.
The control unit 110 prints while moving the printing squeegee 62 in a direction orthogonal to the tangent line of the outer peripheral circle of the moving table 150.
Since the print squeegee 62 moves in the radial direction, the movement of the print squeegee 62 does not apply a rotating force to the moving table 150. That is, the moving table 150 does not rotate during printing. By printing along the radial direction, no rotational force is applied to the table axis, so printing accuracy is improved.
Since printing starts from the inside in the radial direction, the moment of force for tilting the table axis 156 at the start of printing is smaller than that when printing starts from the outside in the radial direction.
Since the height of the upper outer surface of the annular belt 41 is the same as the height of the surface of the moving table 150, the moving table 150 does not interfere with printing.
For example, the printing unit 60 shall perform so-called solid coating printing in which the ink 68 is applied to the entire surface of the work 69.
When performing solid printing, the ink 68 may drip around the work 69.
Since the suction unit 55 sucks only the inside of the outer periphery of the back surface of the work 69, the suction unit 55 does not suck the ink 68 dripping around the work 69.

When the moving table 150 carries the work 69, at time T2, the control unit 110 supplies the hot air 306 from the hot air device 301 to the duct 302, raises the hot air blower 303, and blows out the hot air during printing.
When printing is finished, the control unit 110 raises the upper and lower pillars 51 to raise the printing unit 60. Further, the control unit 110 stops the supply of hot air and lowers the hot air blower 303.

Step S19a: The squeegee movement control unit 110 moves the print squeegee 62 from the print end position to the print start position after raising the print unit 60.
That is, the control unit 110 moves the print squeegee 62 from the rear to the front to position the print squeegee 62 at the print start position.

Step S14: Table rotation step (reverse rotation) / Plate frame position adjustment step At time T3, the control unit 110 reversely rotates the moving table 150 by 180 degrees.
The control unit 110 operates the plate frame position adjusting unit 65 by using the same value as the plate frame position adjusting step described in step S12 according to the amount of misalignment stored in the second memory.
The reason why the misalignment amount of the first work mounting portion 30 and the first memory is made to correspond to the misalignment amount of the second work mounting portion 30 and the second memory is due to the positioning by the forward rotation and the reverse rotation. This is because it is considered that there may be a difference in the positioning error of the positioning.
That is, the control unit 110 uses the amount of misalignment due to forward rotation positioning for printing position adjustment by forward rotation positioning, and uses the amount of misalignment due to reverse rotation positioning for print position adjustment by reverse rotation positioning. Therefore, the positioning error due to the forward rotation and the reverse rotation can be ignored.

Step S15a: Imaging step / Belt circulation start step At time T4, the control unit 110 images the work 69 of the first work mounting unit 30 by the camera 66. The control unit 110 calculates the amount of misalignment from the image of the work 69 of the first work mounting unit 30, and stores the amount of misalignment in the first memory.
After imaging, the control unit 110 starts circulation of the annular belt 41 as follows.
The control unit 110 starts the counterclockwise rotation of the motor 71 and pushes up the upper and lower pins 82 of the upper and lower cylinders 81.
As the upper and lower pins 82 rise, the moving seat 77 rotates counterclockwise about the rotation shaft 85. When the moving seat 77 rotates counterclockwise, the outer circumference of the drive roller 73 comes into contact with the outer circumference of the transmission roller 46. In this way, the control unit 110 connects the belt moving mechanism 40 and the drive mechanism 70. Here, the connection means a state in which the outer circumference of the drive roller 73 is in contact with the outer circumference of the transmission roller 46, and the rotation of the drive roller 73 causes the rotation of the transmission roller 46.

The counterclockwise rotation of the motor 71 rotates the pulley 72, and the rotation of the pulley 72 rotates the pulley 74 via the transmission belt 76. The rotation of the pulley 74 causes the drive roller 73 to rotate counterclockwise.
The counterclockwise rotation of the drive roller 73 rotates the transmission roller 46, and the rotation of the transmission roller 46 rotates the pulley 47. The rotation of the pulley 47 rotates the pulley 44 via the transmission belt 49. The rotation of the pulley 44 causes the belt roller 42 to rotate clockwise. The rotation of the belt roller 42 causes the annular belt 41 to circulate clockwise.
When the motor 71 rotates counterclockwise, the annular belt 41 moves to the right and the work 69 moves to the right.

Step S16a: Suction stop / work unloading process The control unit 110 continues belt circulation until the work 69 is unloaded to the right, and stops suction by the suction unit 55 when the work 69 is unloaded to the right. .. After the work 69 is carried out, there is a possibility that the ink 68 dripping on the outer peripheral portion where the work 69 is arranged remains on the surface of the annular belt 41.

Step S17a: Ink removal step The control unit 110 further continues the belt circulation after the work 69 is carried out.
The control unit 110 raises the pin 95 of the cylinder 94 to bring the adhesive roller 916 and the solvent roller 926 closer to the lower outer surface of the annular belt 41, and brings the scraping squeegee 91 into contact with the curved surface of the annular belt 41.
First, the scraping squeegee 91 scrapes the ink 68 remaining on the surface of the annular belt 41.
The solvent roller 926 supplies the solvent while applying pressure to the ink 68 remaining on the surface of the annular belt 41.
The adhesive roller 916 removes the ink 68 remaining on the surface of the annular belt 41 by adhesive force, and also takes out the ink 68 in the through hole 48.

Since the annular belt 41 is sandwiched between the adhesive roller 916, the solvent roller 926, and the two receiving rollers 98, the annular belt 41 moves upward even when the adhesive roller 916 and the solvent roller 926 are under upward pressure. It does not transform into.
Further, the spring forces of the two springs 913 are the same, the adhesive roller 916 is held horizontally, and the adhesive roller 916 comes into uniform contact with the annular belt 41 in the front-rear direction.
Even if the adhesive roller 916 cannot be uniformly contacted when the adhesive roller 916 is raised, the adhesive roller 916 can be rotated by the rotating shaft 912 and is pushed up by the spring 913 on the left and right sides, so that the adhesive roller 916 can be touched. By applying the rising pressure, the entire front-rear direction of the adhesive roller 916 can be brought into close contact with the annular belt 41.
Like the adhesive roller 916, the solvent roller 926 can be brought into close contact with the annular belt 41 in the entire front-rear direction.

Step S18a: Belt circulation stop step After removing the ink 68, the control unit 110 lowers the pin 95 of the cylinder 94 to end the ink removing operation.
Further, the upper and lower pins 82 of the upper and lower cylinders 81 are lowered to disconnect the drive roller 73 and the transmission roller 46, and the drive of the belt moving mechanism 40 is terminated.
After that, the work 69 is set and new printing is started.

Next, the case of the second work mounting portion 30, that is, the case of the other belt moving mechanism 40 on the right side of FIG. 6 will be described.

Step S19b: Squeegee movement After the power is turned on, the control unit 110 raises the print unit 60 and then moves the print squeegee 62 in the forward direction to move the print squeegee 62 from the print end position to the print start position.

Step S12: Table rotation step (forward rotation) / Plate frame position adjustment step At time T1, the control unit 110 rotates the moving table 150 forward by 180 degrees.
As described above, the control unit 110 operates the plate frame position adjusting unit 65 using the position deviation amount stored in the first memory.

Step S15b: Belt circulation start step After the moving table 150 is rotated, the control unit 110 starts carrying out the work 69 in the work mounting unit 30 and printing on the work 69 in the printing unit 60 at the same time.
At time T2, the control unit 110 images the work 69 of the second work mounting unit 30 by the camera 66. The control unit 110 calculates the amount of misalignment from the image of the work 69 of the second work mounting unit 30, and stores the amount of misalignment in the second memory.
After imaging, the control unit 110 starts the belt circulation start step.
The operation of the belt circulation start step in step S15b is the same as the operation of the belt circulation start step in step S15a.

Step S16b: Suction stop / work unloading process The operation of the suction stop / work unloading process in step S16b is the same as the operation of the suction stop / work unloading process in step S16a.

Step S17b: Ink Removal Step The operation of the ink removing step of step S17b is the same as the operation of the ink removing step of step S17a.

Step S18b: Belt circulation stop step The operation of the belt circulation stop step in step S18b is the same as the operation of the belt circulation stop step in step S18a.

Step S14: Table rotation step (reverse rotation) / Plate frame position adjustment step At time T3, the control unit 110 reversely rotates the moving table 150 by 180 degrees.
As described above, the control unit 110 operates the plate frame position adjusting unit 65 according to the amount of misalignment stored in the second memory.

Step S13b: Printing Step When the moving table 150 carries the work 69, the control unit 110 lowers the upper and lower pillars 51 at time T4 and prints by the printing unit 60.
The operation of the printing process in step S13b is the same as the operation of the printing process in step S13a.
When the moving table 150 carries the work 69, the control unit 110 raises the hot air blower 303 at time T4 to supply hot air.
When printing is finished, the control unit 110 raises the upper and lower pillars 51 to raise the printing unit 60. Further, the control unit 110 stops the supply of hot air and lowers the hot air blower 303.

Step S19b: The squeegee movement control unit 110 moves the print squeegee 62 from the print end position to the print start position after raising the print unit 60.
That is, the control unit 110 moves the print squeegee 62 from the rear to the front to position the print squeegee 62 at the print start position.

As described above, the control unit 110 moves the position of the drive roller 73 back and forth to bring the drive roller 73 into contact with the transmission roller 46.
When the moving table 150 is not moving, the control unit 110 connects the belt moving mechanism 40 and the driving mechanism 70 to circulate the annular belt 41.
Further, the control unit 110 controls to disconnect the belt moving mechanism 40 and the driving mechanism 70 when the moving table 150 is moving.

*** Effect of Embodiment 1 ***
According to this embodiment, printing from the inside to the outside in the radial direction does not apply a rotational force to the table shaft, so that the printing accuracy is improved.
According to this embodiment, the control unit 110 rotates the moving table 150 in the forward and reverse rotations and the printing unit 60 executes printing. Therefore, when printing by rotating the moving table 150 only in the forward rotation or the reverse rotation only. In comparison, the placement of the components under the moving table 150 is easier.
According to this embodiment, since the control unit 110 repeats the forward rotation and the reverse rotation of the moving table 150, there is no winding of the cable and the signal line.
According to this embodiment, since the removing unit 90 removes the ink 68, the annular belt 41 can be circulated for screen printing.
Since the removing portion 90 is directly below the annular belt 41, the ink 68 can be removed by utilizing the gravity of the ink 68 when removing the ink 68.
According to this embodiment, since the drive mechanism 70, the removing unit 90, and the hot air supply unit 300 move downward, the belt moving mechanism 40 can rotate and move on the moving table 150.
After the moving table 150 is rotated, the control unit 110 of the present embodiment starts carrying out the work 69 in the work mounting unit 30 and printing on the work 69 in the printing unit 60 at the same time, so that the time can be shortened. Can be done.
Since the control unit 110 of the present embodiment starts setting the work 69 in the work mounting unit 30 when the print squeegee moves after printing, the time can be shortened.

*** Other configurations ***
The number of the work mounting portion 30 and the belt moving mechanism 40 is not limited to two. The moving table 150 may have one, three, four, or five or more work mounting portions 30, and a belt moving mechanism 40.
In this embodiment, the number of the work mounting portion 30 and the belt moving mechanism 40 is one, and the positions of the work mounting portion 30 and the belt moving mechanism 40 do not rotate by the moving table 150 but move linearly back and forth. It can be applied even if it is fixed to.
This embodiment can be applied even when the number of the work mounting portion 30 and the belt moving mechanism 40 is one and the positions of the work mounting portion 30 and the belt moving mechanism 40 are fixed without moving.
The control unit 110 may rotate the motor 71 clockwise to carry out the work 69 to the left instead of rotating the motor 71 counterclockwise to carry out the work 69 to the right.
The number of works 69 mounted on the annular belt 41 is not limited to one, and a plurality of works 69 may be mounted at the same time to print a plurality of works 69 in one printing.
The transmission of the driving force is not limited to the case of using the pulley and the belt, but may be the case of engaging the teeth of the gear.

The removal unit 90 may not be solid-painted on the work 69, but may be printed only on the inside of the outer periphery of the work 69. The removing unit 90 can be used to remove dust and dirt on the surface of the annular belt 41 in addition to the ink 68 on the surface of the annular belt 41.
The removing portion 90 does not have to be fixed to the base 50, and may be fixed to the moving table 150. When the removing unit 90 is fixed to the moving table 150, the removing unit 90 is always under the belt moving mechanism 40, and the removing unit 90 and the belt moving mechanism 40 rotate at the same time as the moving table 150 rotates.
The removing portion 90 may be fixed anywhere as long as it is the lower part of the belt moving mechanism 40. If the removal of the ink 68 is delayed, the ink 68 may fall from the annular belt 41. Therefore, it is desirable that the removing portion 90 is arranged at a position close to the discharge position of the work 69.

Embodiment 2.
In the second embodiment, the points different from the first embodiment will be described.

*** Explanation of configuration ***
FIG. 7 is a configuration diagram of the screen printing apparatus 100 of the second embodiment.
The screen printing device 100 of the second embodiment is different from the first embodiment in the belt moving mechanism 40 and the driving unit 170 of the driving mechanism 70.

<< Belt movement mechanism 40 >>
The belt moving mechanism 40 has a forward transmission roller 461 and a reverse transmission roller 462.
The forward transmission roller 461 is a roller that transmits a driving force for advancing the annular belt 41.
The reverse transmission roller 462 is a roller that transmits a driving force for moving the annular belt 41 backward.
The forward transmission roller 461 and the reverse transmission roller 462 are rotatably fixed to the fixing plate 99 of the moving table 150 by the fixture 58.
The forward transmission roller 461 has a pulley 471 on the side, and the pulley 471 is rotated by the rotation of the forward transmission roller 461.
The reverse transmission roller 462 has a pulley 472 on the side, and the pulley 472 is rotated by the rotation of the reverse transmission roller 462.
A transmission belt 491 is hung on the pulley 471 and the pulley 44.
A transmission belt 492 is hung on the pulley 472 and the pulley 45.

<< Drive unit 170 of drive mechanism 70 >>
The drive unit 170 has a forward drive roller 731 and a reverse drive roller 732.
The forward drive roller 731 is a roller that generates a driving force for moving the annular belt 41 forward.
The reverse drive roller 732 is a roller that generates a driving force for moving the annular belt 41 backward.
A forward drive roller 731 and a reverse drive roller 732 are rotatably attached to the moving seat 77.
The forward drive roller 731 fixes the pulley 741 to the rotating shaft.
The reverse drive roller 732 fixes the pulley 742 to the rotating shaft.
A transmission belt 76 is hung on the pulley 72, the pulley 741 and the pulley 742.

*** Explanation of operation ***
When the work 69 is moved to the right, the same operation as the belt circulation start step of step S15 of the first embodiment is performed.
That is, the control unit 110 pushes up the upper and lower pins 82 of the upper and lower cylinders 81, rotates the moving seat 77 counterclockwise, and brings the outer circumference of the forward drive roller 731 into contact with the outer circumference of the forward transmission roller 461.
The counterclockwise rotation of the motor 71 rotates the pulley 72, and the rotation of the pulley 72 rotates the pulley 741 via the transmission belt 76. The rotation of the pulley 741 causes the forward drive roller 731 to rotate counterclockwise.
The counterclockwise rotation of the forward drive roller 731 rotates the forward transmission roller 461, and the rotation of the forward transmission roller 461 rotates the pulley 471. The rotation of the pulley 471 rotates the pulley 44 via the transmission belt 491. The rotation of the pulley 44 causes the belt roller 42 to rotate clockwise. The rotation of the belt roller 42 causes the annular belt 41 to circulate clockwise.
In this way, when the motor 71 rotates counterclockwise, the annular belt 41 moves to the right and the work 69 moves to the right.

When moving the work 69 to the left, the control unit 110 pushes down the upper and lower pins 82 of the upper and lower cylinder 81, rotates the moving seat 77 clockwise, and makes the outer circumference of the reverse drive roller 732 the outer circumference of the reverse transmission roller 462. To contact.
The clockwise rotation of the motor 71 rotates the pulley 72, and the rotation of the pulley 72 rotates the pulley 742 via the transmission belt 76. The rotation of the pulley 742 causes the reverse drive roller 732 to rotate clockwise.
The clockwise rotation of the reverse drive roller 732 rotates the reverse transmission roller 462, and the rotation of the reverse transmission roller 462 rotates the pulley 472. The rotation of the pulley 472 rotates the pulley 45 via the transmission belt 492. The rotation of the pulley 45 causes the belt roller 43 to rotate counterclockwise. The rotation of the belt roller 43 causes the annular belt 41 to circulate counterclockwise.
In this way, when the motor 71 rotates clockwise, the annular belt 41 moves to the right and the work 69 moves to the right.

*** Effect of Embodiment 2 ***
When moving the annular belt 41 to the right, the belt roller 42 on the right pulls the annular belt 41. On the contrary, when the annular belt 41 is moved to the left, the belt roller 43 on the left pulls. In this way, since the annular belt 41 is not pushed in the moving direction, the shape of the annular belt 41 is not deformed.

*** Other configurations ***
In the second embodiment, a take-up type roll material may be used instead of the annular belt 41. Roll paper or non-woven fabric is soft. In the second embodiment, since the roll material can be pulled in the left and right moving directions, even a soft roll material can be moved in the winding direction and the rewinding direction without deforming the roll material.
That is, the belt of the second embodiment does not have to be an annular belt, and the belt of the second embodiment may be a strip-shaped long object. The roll material is an example of a belt that does not circulate.

Embodiment 3.
In the third embodiment, the points different from the first embodiment will be described.

*** Explanation of configuration ***
FIG. 8 is a configuration diagram of the belt moving mechanism 40 and the driving mechanism 70 of the third embodiment.
In (a), the drive roller 73 is fixed to the rotating shaft of the motor 71, and the pulley 72 and the transmission belt 76 are omitted from the drive mechanism 70.
In (b), the transmission roller 46 is fixed to the rotating shaft of the belt roller 42, and the pulley 44 and the transmission belt 49 are omitted from the belt moving mechanism 40.
In (c), the drive roller 73 is fixed to the rotating shaft of the motor 71, the pulley 72 and the transmission belt 76 are omitted from the drive mechanism 70, and the transmission roller 46 is fixed to the rotating shaft of the belt roller 42 to move the belt. The pulley 44 and the transmission belt 49 are omitted from the mechanism 40.

*** Effect of Embodiment 3 ***
In this embodiment, the number of parts can be reduced.

Embodiment 4.
In the fourth embodiment, the points different from the first embodiment will be described.

*** Explanation of configuration ***
FIG. 9A is a configuration diagram of the drive unit 170 and the position moving unit 180.
Similar to the first embodiment, the motor 71 and the drive roller 73 are attached to the moving seat 77.
The moving seat 77 is fixed to the upper and lower pins 82 of the upper and lower cylinders 81.
The upper and lower cylinders 81 are fixed to the base 50.
When the drive mechanism 70 is moved up and down, the control unit 110 moves the upper and lower pins 82 of the upper and lower cylinders 81 up and down.

The position moving unit 180 does not move the driving unit 170, but simply moves the driving unit 170 up and down to bring the driving roller 73 into contact with the transmission roller 46.
Although not shown, the position moving unit 180 may move the driving unit 170 to the left or right or diagonally to bring the driving roller 73 into contact with the transmission roller 46.

FIG. 9B is a configuration diagram of the drive unit 170 and the position moving unit 180.
Similar to the first embodiment, the motor 71 and the drive roller 73 are attached to the moving seat 77.
The moving seat 77 has an arc shape.
A saucer is formed on the upper part of the fixed pillar 84.
The moving seat 77 is placed on a saucer of the fixed pillar 84.
The upper and lower pins 82 of the upper and lower cylinders 81 come into contact with the sides of the moving seat 77.
When the drive mechanism 70 is moved up and down, the control unit 110 moves the upper and lower pins 82 of the upper and lower cylinders 81 up and down.

The position moving portion 180 has a downward convex arc shape at the lower end of the moving seat 77, a tray shape at the top of the fixed pillar 84, and the lower end of the moving seat 77 is placed on the top of the fixed pillar 84 and shaken like a cradle.

*** Effect of Embodiment 4 ***
In this embodiment, since the rotating shaft 85 is not used, the configuration is simplified.

Embodiment 5.
In the fifth embodiment, the points different from the first embodiment will be described.

*** Explanation of configuration ***
10 to 13 are a front configuration view and an AA sectional view of the screen printing apparatus 100 according to the fifth embodiment.
10 to 13 correspond to FIGS. 1 to 4, but the differences are the bottom plate 153 of the moving table 150 and the fixture 58.
In the fifth embodiment, the bottom plate 153 of the moving table 150 is also present in the U-shaped notch, and the annular belt 41 is located in the center of the bottom plate 153 existing in the U-shaped notch of the moving table 150. An opening 154 is formed to expose the outer and lower surfaces. The opening 154 is a rectangle having the same size as the planar shape of the belt moving mechanism 40, and the entire outer and lower surfaces of the annular belt 41 are exposed downward. Three fixtures 58 are erected on both sides of the opening 154. As shown in FIGS. 12 and 13, one fixture 58 has a micrometer 158 and a guide 159, and the position of the fixture 58 can be moved left and right along the guide 159 by adjusting the micrometer 158. The left and right positions of the rotation axis of the roller of the belt moving mechanism 40 can be adjusted.
Further, the fixture 58 is not fixed to the fixing plate 99 of the moving table 150, but is fixed to the bottom plate 153 of the moving table 150. The fixture 58 of the fifth embodiment is erected upward from the bottom plate 153 with respect to each roller. The belt roller 42, the belt roller 43, the transmission roller 46, and the receiving roller 98 are rotatably fixed to the moving table 150 by a fixture 58 erected from the bottom plate 153.
While the moving table 150 is moving, the control unit 110 lowers the scraping squeegee 91, the adhesive roller portion 910, and the solvent roller portion 920 to a position lower than the lower surface of the bottom plate 153 of the moving table 150. When removing the ink 68, the control unit 110 raises the scraping squeegee 91, the adhesive roller portion 910, and the solvent roller portion 920 to pass through the opening 154 to remove the ink 68.
Since the opening 154 is formed in the bottom plate 153, the drive mechanism 70 can remove the ink 68 from the outer and lower surfaces of the annular belt 41 as in the first embodiment.

Embodiment 6.
In the sixth embodiment, the points different from the fifth embodiment will be described.

*** Explanation of configuration ***
FIG. 14 is a configuration diagram of the screen printing apparatus 100 of the sixth embodiment.
The screen printing device 100 of the sixth embodiment is the screen printing device 100 of the fifth embodiment, which requires the belt moving mechanism 40 of the second embodiment and the driving unit 170 of the driving mechanism 70.
In this way, the second and fifth embodiments may be combined.

Embodiment 7.
In the seventh embodiment, the points different from the fifth embodiment will be described.

*** Explanation of configuration ***
15 and 16 are a front configuration view and an AA sectional view of the base 50 and the moving table 150 according to the seventh embodiment.
The moving table 150 of the seventh embodiment simplifies the configuration of the moving table 150 of the first embodiment, and the fixing plate 99 is directly fixed to the table shaft 156.
According to the seventh embodiment, the configuration of the moving table 150 is simplified.

Embodiment 8.
In the eighth embodiment, the points different from the above-described embodiments will be described.

*** Explanation of configuration ***
FIG. 17 is a flow chart of the screen printing method according to the seventh embodiment.
FIG. 17 of the eighth embodiment differs from FIG. 6 of the first embodiment in the following two points.

Difference 1
When printing on the work 69 in the printing unit 60, the control unit 110 of the present embodiment only executes printing on the work 69 in the printing unit 60.
In FIG. 17, when the printing process S13a and the printing process S13b are executed, other operations are stopped.
That is, the belt circulation start step 15b starts after the printing step S13a is completed.
Further, the belt circulation start step 15a starts after the printing step S13b is completed.
Since no other operation is executed when the printing process S13a and the printing process S13b are executed, vibration due to the other operation does not occur during printing. Therefore, accurate printing becomes possible.

Difference 2
The control unit 110 of the present embodiment executes only the setting of the work 69 in the work mounting unit 30 when the work 69 is set in the work mounting unit 30.
In FIG. 17, when the work set / suction start step S11a and the work set / suction start step S11b are executed, other operations are stopped.
That is, the movement of the print squeegee starts after the work set / suction start step S11b is completed.
Further, the movement of the print squeegee is started after the work set / suction start step S11a is completed.
Since no other operation is executed when the work set / suction start step S11a and the work set / suction start step S11b are executed, vibration due to the other operation does not occur when the work is positioned. Therefore, accurate positioning is possible.

Only one of the difference 1 and the difference 2 may be executed.

*** Supplement to the embodiment ***
In the embodiment, the case of the screen printing device 100 has been described, but the belt driving device 200 can be used not only for the screen printing device 100 but also for other devices. For example, the belt drive device 200 can be used as a painting device, a surface processing device, or the like by using a painting unit, a surface processing unit, or the like instead of the printing unit 60.

The function of the control unit 110 may be realized by a combination of software and hardware. That is, a part of the control unit 110 may be realized by software, and the rest of the control unit 110 may be realized by hardware.

The embodiments are examples of preferred embodiments and are not intended to limit the technical scope of the invention. The embodiment may be partially implemented or may be implemented in combination with other embodiments. Further, the above-described embodiments may be combined.
The procedure described using a flowchart or the like is an example of the procedure of the method or program according to the present invention.

30 work mounting part, 300 hot air supply part, 301 hot air blower, 302 duct, 303 hot air blower, 304 upper and lower pins, 305 upper and lower cylinders, 306 hot air, 307 blowout holes, 40 belt movement mechanism, 41 annular belt, 411 V-shaped guide , 42 belt roller, 421 V-groove, 43 belt roller, 44 pulley, 45 pulley, 46 transmission roller, 461 forward transmission roller, 462 reverse transmission roller, 47 pulley, 471 pulley, 472 pulley, 48 through hole, 49 transmission belt, 491 transmission belt, 492 transmission belt, 50 base, 51 upper and lower columns, 52 beam frame, 55 suction part, 56 suction pipe, 57 suction groove, 58 fixture, 59 holding surface, 60 printing part, 61 printing mechanism, 62 printing Squeegee, 63 screen plate making, 64 mounting mechanism, 65 plate frame position adjustment unit, 66 camera, 67 plate frame control unit, 68 ink, 69 workpieces, 70 drive mechanism, 71 motor, 72 pulley, 73 drive roller, 731 forward drive roller , 732 reverse drive roller, 74 pulley, 741 pulley, 742 pulley, 75 tension pulley, 76 transmission belt, 77 moving seat, 170 drive part, 180 position moving part, 81 vertical cylinder, 82 vertical pin, 83 fixed pillar, 84 fixed Pillar, 85 rotating shaft, 90 removing part, 91 scraping squeegee, 910 adhesive roller part, 911 holding part, 912 rotating shaft, 913 spring, 914 base, 916 adhesive roller, 917 rotating shaft, 918 roller shaft, 920 solvent roller part , 921 holding part, 922 rotating shaft, 923 spring, 924 base, 926 solvent roller, 927 solvent reservoir, 94 cylinder, 95 pin, 96 suction device, 97 upper and lower parts, 98 receiving roller, 99 fixing plate, 100 screen printing device, 110 control unit, 111 signal line, 150 mobile table, 151 table surface, 152 installation unit, 153 bottom plate, 154 opening, 155 carry-in device, 156 table shaft, 157 carry-out device, 158 micrometer, 159 guide, 200 belt drive device ..

Claims (13)

1. A moving table that has multiple workpiece mounting parts centered on the table axis and rotates around the table axis,
   A printing unit that prints from the inside to the outside in the radial direction with respect to the workpieces mounted on the plurality of workpiece mounting portions.
   A screen printing device including a control unit that rotates the moving table in the forward and reverse directions and executes printing by the printing unit.
2. The control unit
   The screen printing apparatus according to claim 1, wherein after the moving table is rotated, the work is carried out at the work mounting unit and printing on the work at the printing unit is started at the same time.
3. The control unit
   The screen printing apparatus according to claim 1, wherein when printing on a work in the printing unit, only printing on the work in the printing unit is executed.
4. The control unit
   The screen printing apparatus according to any one of claims 1 to 3, wherein only the work is set in the work mounting portion when the work is set in the work mounting portion.
5. A belt movement mechanism that moves the annular belt and
   Claims 1 to 4 include a removing portion arranged at the lower part of the annular belt, which includes a removing portion for removing ink adhering to the annular belt by adhesive force when the annular belt is circulating. The screen printing apparatus according to any one of the following items.
6. The screen printing apparatus according to claim 5, wherein the removing unit has an adhesive roller that adheres and removes ink.
7. The screen printing apparatus according to claim 5 or 6, wherein the removing unit has a solvent roller impregnated with a solvent.
8. The screen printing apparatus according to any one of claims 5 to 7, which is arranged below the printing unit and the annular belt and has a hot air supply unit that blows out hot air.
9. A camera that shoots the work mounted on the work mounting part, and
   It has a plate frame position adjustment unit that adjusts the installation position of screen plate making.
   The control unit detects the amount of misalignment of the print pattern from the image captured by the camera, and stores the amount of misalignment in the memory corresponding to the plurality of workpiece mounting units.
   Any one of claims 1 to 8 in which the control unit adjusts the installation position of screen plate making by the plate frame position adjusting unit based on the amount of misalignment corresponding to the work mounting unit on which the work is mounted before printing the work. The screen printing apparatus according to item 1.
10. The control unit
    The positive and negative values of the amount of misalignment between the X-axis direction and the Y-axis direction are used for adjusting the position of the plate frame.
    The screen printing apparatus according to claim 9, wherein a value obtained by reversing the positive and negative values of the amount of misalignment in the rotation axis direction is used for adjusting the position of the plate frame.
11. A moving table having a plurality of workpiece mounting parts centered on the table axis is rotated forward and backward around the table axis.
    A screen printing method in which a printing unit prints from the inside to the outside in the radial direction on a work mounted on the plurality of work mounting portions.
12. The screen printing method according to claim 11, wherein after the moving table is rotated, the work is carried out at the work mounting portion and the printing on the work at the printing portion is started at the same time.
13. The screen printing method according to claim 11, wherein only printing on the work in the printing unit is executed at the time of printing on the work in the printing unit.

Images