TWI792050B - Printing device and printing method - Google Patents

Abstract

The printing device (100) of the present invention is provided with: a printing table (70), which mounts a workpiece (99) having a curved part with a section parallel to the printing direction; The printing table (70) can be installed to rotate around the center line of the above-mentioned bending part; the driving part (56), which makes the above-mentioned printing table (70) rotate around the above-mentioned center line; the mobile table (52), which is fixed The support (53) and the driving unit (56); and a frame (51) on which the mobile platform (52) is movably mounted.

Description

Printing device and printing method

The present invention relates to a printing device and a printing method. Especially about screen printing Brush device.

In the past, there have been printing devices for workpieces with curved surfaces.

[Prior Art Literature] [Patent Document]

Patent Document 1: Japanese Patent Laid-Open No. 2017-222162

The invention provides a printing device for workpieces with curved surfaces.

The printing device of the present invention is provided with: a printing table, which mounts a workpiece having a curved section formed by a vertical plane parallel to the printing direction; The center line of the above-mentioned bending part is installed to rotate around the center line; the drive part rotates the above-mentioned printing table around the center line of the above-mentioned; The mobile station is removably installed.

According to the present invention, it is possible to print workpieces having curved surfaces.

30: Linkage

51: frame

52: mobile station

53: Pillar

54: Cylinder

55: stopper

56: Drive Department

58: teeth

60: Control Department

61: signal line

70: printing table

71: Bottom plate

72: Bracket

73: Front support plate

74: Rear support plate

75: axis of rotation

76: Clearance

77: gear

78: teeth

81: screw

82: screw

83: screw

91: screen version

92: scraper

99: Workpiece

100: printing device

200: crank mechanism

210: crank cylinder

211: crankshaft

212: cylinder connector

220: support part

221: pin

230: U-shaped hook

231: pin

553: pillar

561: sliding table

562: Rack

563:motor

564: gear

711: Former Hirabe

712: bending part

713: Houpingbu

991: front flat

992: Flexion

993: Rear flat

C: Centerline

Fig. 1 is a front view of a printing apparatus 100 according to Embodiment 1.

Fig. 2 is a right side view of the printing device 100 according to the first embodiment.

Fig. 3 is a plan view of the printing device 100 of the first embodiment.

Fig. 4 is an exploded perspective view of the printing table 70 of the first embodiment.

Fig. 5 is a partially enlarged view of the printing table 70 of the first embodiment.

Fig. 6 is a flow chart showing the operation of the printing apparatus 100 according to the first embodiment.

Fig. 7 is an explanatory diagram of the printing operation of the printing device 100 in the first embodiment in the first half of the printing process.

Fig. 8 is an explanatory view of the flexure printing operation of the printing apparatus 100 according to the first embodiment.

Fig. 9 is an explanatory diagram of the printing operation in the second half of printing by the printing apparatus 100 according to the first embodiment.

Fig. 10 is an explanatory diagram of a modified example of the printing apparatus 100 of the first embodiment.

Fig. 11 is an explanatory diagram of a modified example of the printing table 70 of the first embodiment.

Fig. 12 is an explanatory diagram of a modified example of the printing table 70 and the workpiece 99 of the first embodiment. Fig. 12 (a) and (b) are the figures that the bending angle is 90 degrees, Fig. 12 (c) is the figure that the workpiece 99 only has the flexure 992, and Fig. 12 (d) is the figure that the bending angle is 180 degrees.

Fig. 13 is a front view of the printing apparatus 100 according to the second embodiment.

Fig. 14 is a right side view of the printing apparatus 100 according to the second embodiment.

Fig. 15 is a plan view of a printing device 100 according to the second embodiment.

Fig. 16 is an explanatory view of the flexure printing operation of the printing apparatus 100 according to the second embodiment.

Embodiments of the present invention will be described below using the drawings.

Furthermore, in the description of each embodiment, "upper", "lower", "left", "right", "front", "rear", "front", "back", "deep", "high" Directions such as , "width", "front", "longitudinal" and "horizontal" are described only for the convenience of description, and are not used to limit the arrangement or orientation of devices, utensils, parts, etc.

Implementation form 1.

＊＊＊Description of workpiece 99＊＊＊

●Workpiece 99 (Fig. 4, Fig. 5)

The workpiece 99 has a curved portion 992 with a circular arc cross-section formed by a vertical plane parallel to the printing direction.

As shown in FIG. 4, the workpiece|work 99 has the following structure.

●Front flat part 991

●flexion part 992

●Rear flat part 993

The front flat part 991 is the front half part of printing, and is a part presenting a plane.

The flex portion 992 is the central portion of the print and is the flexed portion.

The back flat part 993 is the back half of printing, and is a part showing a plane.

As shown in FIG. 5 , R is the radius of the arc of the bending portion 992 .

Let the line passing through the center of the arc of the bending portion 992 be the centerline C of the bending portion 992 .

Let the inner angle of the arc of the flexing portion 992 be K degrees.

When the inner angle of the arc of the bending portion 992 of the workpiece 99 is K degrees, the bending angle of the workpiece 99 is K degrees.

That is, if the front flat portion 991 is provided horizontally, the rear flat portion 993 is inclined K degrees downward from the horizontal.

＊＊＊Explanation of the structure of the printing device 100＊＊＊

●Printing device 100 (Fig. 1, Fig. 2, Fig. 3)

The configuration of the printing device 100 will be described with reference to FIGS. 1 , 2 and 3 .

A specific example of the printing device 100 is a screen printing device.

In FIG. 1, the left-right direction when facing a paper surface is also called a horizontal direction.

In FIG. 1 , the vertical direction when facing the paper surface is also referred to as the vertical direction.

In FIG. 1 , the depth direction when facing the paper surface is also referred to as the width direction.

In FIG. 1 , the printing direction of the printing device 100 is the left direction.

The printing device 100 performs screen printing on the workpiece 99 placed on the printing table 70 .

The printing apparatus 100 performs screen printing using a screen plate 91 and using a doctor blade 92 .

The printing device 100 has the following configuration.

●Frame 51

●Mobile station 52

●Pillar 53

●Cylinder 54

●Stop 55

●Drive unit 56

●Control unit 60

●Printing station 70

●Frame 51

The frame body 51 becomes the base of the printing device 100 .

The frame body 51 is a rectangular metal plate that is long in the left-right direction.

The housing 51 is arranged horizontally.

●Mobile station 52

The mobile stand 52 is mounted so as to be movable in the left-right direction with respect to the housing 51 .

The mobile stand 52 is a rectangular metal plate that is long in the left-right direction.

The mobile station 52 is fixed with the following components.

(1) Pillar 53

(2) Cylinder 54

(3) stopper 55

(4) Drive unit 56

(5) Control unit 60

●Pillar 53

A pair of pillars 53 are provided along the width direction of the moving table 52 .

The pillar 53 is a pillar fixed to the mobile platform 52 .

Pillar 53 is made by bakelite or metal.

The support 53 rotatably mounts the printing table 70 on the upper part.

The pillar 53 is mounted so that the printing table 70 can rotate around the center line C of the bending portion 992 of the workpiece 99 .

●Cylinder 54

A pair of air cylinders 54 are provided along the left-right direction, and are fixed to the moving table 52 .

The cylinder 54 moves the rod up and down.

The front end of the rod is in a hemispherical shape.

The cylinder 54 supports the lower surface of the printing table 70 during printing.

The left air cylinder 54 is in contact with the left lower surface of the printing table 70 and supports the left lower surface of the printing table 70 so that the left side of the printing table 70 becomes horizontal.

The right air cylinder 54 is in contact with the right lower surface of the printing table 70 and supports the right lower surface of the printing table 70 so that the right side of the printing table 70 becomes horizontal.

●Stop 55

A pair of stoppers 55 are provided along the left-right direction, and are fixed to the moving table 52 .

The stopper 55 can adjust the position of the rod up and down.

The front end of the rod is in a hemispherical shape.

The stopper 55 supports the lower surface of the printing platform 70 when not printing.

The stopper 55 on the left is in contact with the lower surface of the left side of the printing table 70, and prohibits the left side of the printing table 70 from rotating to be higher than the horizontal plane.

The stopper 55 on the right is in contact with the lower surface of the right side of the printing table 70, and prohibits the right side of the printing table 70 from rotating to the top of the horizontal plane.

●Drive unit 56

The drive unit 56 rotates the gear 77 to rotate the printing table.

The drive unit 56 has a link mechanism 30 that converts linear motion into rotational motion.

The link mechanism 30 of the drive unit 56 has a slide table 561 and a rack 562 .

The slide table 561 is provided with a rack 562 slidable in the left-right direction.

The teeth 58 of the rack 562 mesh with the teeth 78 of the gear 77 to rotate the gear 77 .

The slide table 561 rotates the printing table 70 about the centerline C of the flexure part 992 by moving the rack 562 left and right.

The link mechanism 30 converts the linear movement of the rack 562 into the rotational movement of the printing table 70 centered on the centerline C of the flexure 992 .

●Control unit 60

The control unit 60 controls the printing device 100 to control the screen printing operation.

The control unit 60 can be realized by a central processing unit, a program, a memory, and a storage device.

The control signal from the control unit 60 is transmitted to each unit through the signal line 61 as an electric signal.

The screen printing operation described below can be realized by the control unit 60 using the signal line 61 to send and receive commands and signals.

●Printing station 70 (Fig. 4 and Fig. 5)

The printing table 70 will be described using FIGS. 4 and 5 .

A workpiece 99 is placed on the printing table 70 .

The printing table 70 swings around the rotating shaft 75 .

The printing table 70 has the following configuration.

(1) Bottom plate 71

(2) bracket 72

(3) Front support plate 73

(4) Rear support plate 74

(5) Gap 76

(6) Gear 77

(7) Rotation shaft 75

●(1) Bottom plate 71 (Figure 4)

The bottom plate 71 is a base material that determines the shape of the printing table 70 .

Base plate 71 is made of stainless steel or other metals.

The bottom plate 71 can be manufactured by bending a single rectangular metal plate.

The bending angle (K degree) of the base plate 71 is the same as the bending angle (K degree) of the workpiece 99 .

As shown in FIG. 4, the bottom plate 71 has the following configuration.

●Front flat part 711

The front flat part 711 is the front half part of the bottom plate 71, and is a part presenting a plane.

The front flat portion 711 has a length halfway to the curved portion 712 .

The left end portion of the front flat portion 711 extends below the center line C of the bent portion 992 of the workpiece 99 .

●Curved part 712

The curved portion 712 is a part slightly to the left of the central part of the bottom plate 71, and is a curved part.

The bent portion 712 is bent with a different radius than the bent portion 992 of the workpiece 99 .

The bent portion 712 may also be bent with the same radius R as the bent portion 992 of the workpiece 99 .

●Rear flat part 713

The rear flat portion 713 is the rear half of the bottom plate 71, and is a part presenting a plane.

●(2) Bracket 72 (Figure 4)

A pair of brackets 72 are provided along the width direction of the printing table 70 .

Support 72 is the rod of the hexahedron of column.

The bracket 72 is made of aluminum or other metals.

The bracket 72 is fixed to both sides of the printing table 70 (front support plate 73 ) with screws 81 ( FIG. 5 ).

The bracket 72 has a length from the right end of the front flat portion 711 to the middle of the curved portion 712 .

The bracket 72 has the same length as the front flat portion 711 .

The left end of the bracket 72 covers the center line C of the bending portion 992 of the workpiece 99 .

The bracket 72 installs the rotating shaft 75 on the upper part of the left end.

The bracket 72 attaches the rotating shaft 75 to a position serving as the center line C of the flexed portion 992 .

●(3) Front support plate 73 (Figure 4)

Front support plate 73 is the plate of hexahedron.

The front support plate 73 is made of bakelite, plastics, other resins or metal.

The front support plate 73 is fixed to the upper surface of the front flat portion 711 with screws 83 ( FIG. 5 ).

The front support plate 73 has a length equal to or less than the length of the front flat portion 711 .

The front support plate 73 places the front flat portion 991 of the workpiece 99 on the upper surface.

The front support plate 73 is a connecting plate that connects the pair of brackets 72 along the width direction.

●(4) Rear support plate 74 (Fig. 4)

Back support plate 74 is the plate of hexahedron.

The rear support plate 74 is made of bakelite, plastics, other resins, or metal.

The rear support plate 74 is fixed to the upper surface of the rear flat portion 713 with screws 83 (FIG. 5).

The rear support plate 74 has a length below the length of the rear flat portion 713 .

The rear support plate 74 places the rear flat portion 993 of the workpiece 99 on the upper surface.

Since the front flat portion 711 has a length halfway to the curved portion 712 , the rear support plate 74 is thinner than the front support plate 73 .

●(5) Gap 76 (Fig. 5)

The gap portion 76 is a space between the left end surface of the front support plate 73 and the right end surface of the rear support plate 74 .

A bent portion 992 of the workpiece 99 is disposed on the gap portion 76 .

●(6) Gear 77 (Figure 5)

One gear 77 is provided on one side of the printing table 70 .

The gear 77 rotates the rotation shaft 75 of the printing table 70 .

The gear 77 is fixed to the bracket 72 of the printing table 70 with screws 82 .

The gear 77 is fan-shaped.

The gear 77 rotates around the rotating shaft 75 .

When the gear 77 rotates, the printing table 70 also rotates.

The inner angle system of the gear 77 is L degree, and the L degree only needs to be more than the bending angle K degree.

The radius M of the gear 77 is centered on the centerline C ( FIG. 5 ) of the flexure 992 of the workpiece 99 .

The radius M of the gear 77 is greater than the radius R of the flexed portion 992 of the workpiece 99 .

The teeth 78 of the gear 77 are arranged along a circular arc with a radius M. As shown in FIG.

●(7) rotating shaft 75 (Fig. 4)

A pair of rotating shafts 75 are provided along the width direction of the printing table 70 .

The rotating shaft 75 exists in a straight line.

The rotating shaft 75 can also be a shaft passing through the printing table 70 along the width direction.

The rotation shaft 75 is arranged perpendicular to the printing direction, and is arranged horizontally.

The rotation shaft 75 is a shaft fixed to the pillar 533 .

The rotating shaft 75 passes through the gear 77 and the bracket 72 .

The rotating shaft 75 is attached so that the gear 77 and the bracket 72 can rotate.

The centerline of the rotating shaft 75 coincides with the centerline C of the flexure portion 992 .

＊＊＊Description of action＊＊＊

Using FIG. 6 , the screen printing method of the printing apparatus 100 which can rotatably install the printing table 70 on which the workpiece 99 is placed will be described.

Here, a method of printing a workpiece 99 having a front flat portion 991 , a bent portion 992 and a rear flat portion 993 will be described.

In addition, the printing operation of the printing apparatus 100 in the left direction will be described.

*Preparation step S10*

When the power supply of the printing apparatus 100 is turned on (ON), the control unit 60 starts the following initial operations.

The control unit 60 moves the rack 562 of the slide table 561 to the initial position on the right side, and rotates the printing table 70 so that the front half thereof becomes horizontal as shown in FIG. 7 .

The left stop 55 prevents the printing table 70 from being rotated substantially to the left.

The control unit 60 places the workpiece 99 on the printing table 70 and arranges the workpiece 99 under the screen 91 by means of a loading/unloading device not shown.

The control unit 60 sucks the workpiece 99 onto the printing table 70 by a suction mechanism not shown, and fixes the workpiece 99 on the printing table 70 .

The control unit 60 raises the rod of the right cylinder 54 .

The right air cylinder 54 supports the lower surface of the front flat portion 711 in a state where the front flat portion 991 of the workpiece 99 is parallel to the screen 91 .

The control unit 60 moves the squeegee 92 to the printing start position on the right side.

*The first half printing step S20*

Figure 7 is a diagram showing the first half of printing.

The first half printing step S20 is a step of fixing the front half of the printing table 70 on which the front flat portion 991 of the workpiece 99 is placed parallel to the printing direction, and printing the front flat portion 991 .

The control unit 60 starts the movement of the squeegee 92 to the left to start printing.

In the first half of printing, the control unit 60 locks the slide table 561 to prohibit rotation of the printing table 70 .

In the first half of printing, the control unit 60 stops the movement of the moving table 52 .

In the first half of printing, since the right cylinder 54 supports the lower surface of the front flat portion 711, even if printing pressure is applied to the front flat portion 991, the printing table 70 will not rotate to the right and the printing table 70 will not be deformed.

The printing step S20 in the first half ends at the time point when the flat portion 991 is printed before the workpiece 99 is printed.

*Buckling printing step S30*

Figure 8 is a graph showing buckled printing after the first half of printing.

The bending printing step S30 is a step of printing the bending portion 992 while rotating the printing table 70 around the center line C of the bending portion 992 of the workpiece 99 and moving the printing table 70 in the printing direction.

The control unit 60 simultaneously performs the following controls when printing the bent portion 992 of the workpiece 99 .

(1) Slide the rack 562 of the slide table 561 to the left. When the gear 77 is rotated by moving the rack 562, the printing table 70 is rotated around the rotation shaft 75 (center line C).

(2) The moving stage 52 is moved in the left direction (printing direction) relative to the housing 51 .

(3) Continue to move the scraper 92 toward the left direction (printing direction).

(4) The rod of the cylinder 54 on the right is lowered.

(5) Make the rod of the cylinder 54 on the left rise.

In the bending printing step S30 , the printing table 70 is rotated by rotating the gear 77 having a radius L larger than the radius R of the bending portion 992 .

Although the lower surface of the flexed portion 992 is the gap portion 76 , the flexed portion 992 is still a convex surface even when printing pressure is applied to the flexed portion 992 , so the flexed portion 992 will not be deformed.

The flexure printing step S30 ends when the flexure portion 992 of the workpiece 99 is printed.

*Second half printing step S40*

Figure 9 is a diagram showing the second half printing step after flex printing.

The second half printing step S40 is a step of fixing the rear half of the printing table 70 on which the rear flat portion 993 of the workpiece 99 is placed parallel to the printing direction, and printing the rear flat portion 993 .

The control unit 60 continues the movement of the scraper 92 toward the left.

In the second half of printing, the control unit 60 locks the slide table 561 and prohibits the rotation of the printing table 70 .

In the second half of printing, the control unit 60 stops the movement of the moving table 52 .

In the second half of printing, since the cylinder 54 on the left side supports the lower surface of the rear flat portion 713, even if printing pressure is applied, the printing table 70 will not rotate to the left and the printing table 70 will not be deformed.

The second half of the printing step S40 ends when the workpiece 99 is printed on the flat portion 993 .

When the printing is finished, the control unit 60 unloads the printed workpiece 99 by a loading and unloading device (not shown).

After the workpiece 99 is unloaded, the control unit 60 judges whether there is a next printing, and if there is a next printing, it returns to the preparation step S10.

If there is no next printing, the control unit 60 ends printing.

●Control of buckling printing step S30

The details of the buckling printing step S30 will be described using FIG. 5 .

When the radius of the arc of the flexing portion 992 is R and the inner angle is K degrees, the length E of the arc of the flexing portion 992 will be as follows.

Arc length E = diameter × pi × ratio of arc to circumference = (2 × radius R) × 3.14 × (K degree ÷ 360 degree)

As a specific example, in the case where the radius R=5mm and the degree K=35 degrees, the arc length E of the bending portion 992 will be as follows.

Arc length E=(2×5mm)×3.14×(35°÷360°)=10×3.14×35÷360=3.05277≒3.05mm

The control unit 60 specifically performs the following control.

(1) Slide the rack 562 of the slide table 561 to the left so that the gear 77 is rotated clockwise by 35 degrees. By rotating the gear 77 clockwise by 35 degrees, the turntable 70 is rotated clockwise by 35 degrees around the rotation shaft 75 .

(2) Move the moving stage 52 to the left (printing direction) by 3.05 mm relative to the housing 51 .

(3) Move the squeegee 92 to the left (printing direction) by 3.05 mm.

＊＊＊Description of Effects of Embodiment 1＊＊＊

The known curved surface printing mechanism deals with gentle curved surfaces, but there are situations where it is not suitable for printing on curved surfaces with small radii.

According to Embodiment 1, it is possible to print the curved portion having a circular arc with a small radius.

According to Embodiment 1, since the radius M of the gear 77 is larger than the radius R of the bending portion 992 of the workpiece 99, it can be rotated with high precision.

According to Embodiment 1, by making only the bottom plate 71 whose bending angle is the same as that of the workpiece 99, it can be used in common with other parts of the printing table 70.

**Modification 1 of Embodiment 1****

●A modified example of the drive unit 56, the cylinder 54, and the stopper 55 (Fig. 10)

The driving unit 56 shown in FIG. 10 has a motor 563 and a gear 564 .

The control part 60 can rotate the printing table 70 by rotating the gear 564 by the motor 563. The gear 564 may not be sector-shaped, but may be circular or semicircular.

The cylinder 54 and the stopper 55 shown in FIG. 10 are arranged laterally.

By horizontally disposing the cylinder 54 and the stopper 55 , the upper part of the moving table 52 is vacant, and the rotation angle of the printing table 70 can be enlarged.

Furthermore, one cylinder may also serve as the cylinder 54 and the stopper 55 .

Also, if the fixing of the printing table 70 that can be achieved by the gear 77 and the driving part 56 can be strong enough to resist the printing pressure, the cylinder 54 is not needed.

**Modification 2 of Embodiment 1****

●Modification of printing table 70 (Fig. 11)

The printing table 70 shown in FIG. 11 does not have a front support plate 73 and a rear support plate 74 , but has a bottom plate 71 and a bracket 72 .

The bracket 72 has a cube shape, and has a through hole in the center through which the rotation shaft 75 passes.

The bracket 72 is fixed on both sides of the bent portion 712 of the bottom plate 71 by screws not shown in the figure.

The front flat portion 711 of the bottom plate 71 supports the front flat portion 991 of the workpiece 99 from below.

The curved portion 712 of the bottom plate 71 has the same arc as the curved portion 992 of the workpiece 99 .

The bent portion 712 of the bottom plate 71 supports the bent portion 992 of the workpiece 99 from below.

The rear flat portion 713 of the bottom plate 71 supports the rear flat portion 993 of the workpiece 99 from below.

**Modification 3 of Embodiment 1****

●Modification of printing table 70 and workpiece 99 (Fig. 12)

The gear 77 may not be fan-shaped, but may be circular or semicircular.

Figure 12(a) and (b) are the figures with the bending angle of 90 degrees.

The inner angle of the gear 77 must be more than 90 degrees.

As shown in FIG. 12( a ), the workpiece 99 may have only the front flat portion 991 and the bent portion 992 without the rear flat portion 993 .

As shown in FIG. 12( b ), the workpiece 99 may not have the front flat portion 991 but may have only the bent portion 992 and the rear flat portion 993 .

FIG. 12( c ) is a diagram in which the workpiece 99 has only the bent portion 992 .

The bent portion 992 of the workpiece 99 is sucked by the printing table 70 and fixed to the printing table 70 .

Fig. 12(d) is a diagram in which the inner angle and the bending angle of the flexure portion 992 are 180 degrees.

The workpiece 99 and the printing table 70 are bent into a U-shape.

The inner angle of the gear 77 must be more than 180 degrees.

Implementation form 2.

In Embodiment 2, points different from Embodiment 1 will be described.

＊＊＊Explanation of the structure of the printing device 100＊＊＊

●Printing device 100 (Fig. 13, Fig. 14, Fig. 15)

The configuration of the printing apparatus 100 will be described with reference to FIGS. 13 , 14 and 15 .

A specific example of the printing device 100 is a screen printing device.

The printing apparatus 100 of Embodiment 2 does not have the gear 77, and the configuration of the drive unit 56 is different.

●Drive unit 56

The drive unit 56 has a link mechanism 30 that converts linear motion into rotational motion.

The link mechanism 30 of the drive unit 56 has a crank mechanism 200 .

In FIG. 14 , the driving unit 56 is arranged on the left side of the lower surface of the printing table 70 .

The printing table 70 has a support portion 220 fixed to the rear surface of the rear flat portion 713 .

The support portion 220 is formed in a double-hump shape.

The mobile station 52 has a U-shaped clevis 230 fixed to the mobile station 52 .

The U-shaped hook 230 is disposed under the front flat portion 711 .

The U-shaped hook 230 is formed in a double peak shape.

●Crank Mechanism 200

The crank mechanism 200 has a support portion 220 , a crank cylinder 210 , a crank shaft 211 , and a U-shaped hook 230 .

The crank shaft 211 is linearly moved on the central axis of the crank cylinder 210 by the linear servo motor.

The upper end of the crank shaft 211 is rotatably attached to the support portion 220 via a pin 221 . The pins 221 are arranged horizontally perpendicular to the printing direction.

A cylinder joint 212 is fixed at the lower end of the crank cylinder 210 .

The cylinder joint 212 is rotatably mounted on a U-shaped hook 230 via a pin 231 . The pins 231 are arranged horizontally perpendicular to the printing direction.

The upper end and the lower end of the crank mechanism 200 are rotatable, and the angle between the upper surface of the mobile platform 52 and the upper surface of the mobile platform 52 can be changed passively through the telescopic sliding of the crank shaft 211 .

The crankshaft 211 rotates the printing table 70 about the center line C of the bent portion 992 by pressing the support portion 220 .

The link mechanism 30 converts the linear motion of the crank shaft 211 into the rotational motion of the printing table 70 centered on the center line C of the flexure portion 992 .

＊＊＊Description of action＊＊＊

Referring to FIG. 16 , the buckling printing step S30 will be described.

*Buckling printing step S30*

Figure 16 is a graph showing flex printing after the first half of printing.

The control unit 60 slides the crank shaft 211 upward and leftward when the bent portion 992 of the workpiece 99 is printed.

The control unit 60 pushes the support unit 220 upward by moving the crank shaft 211 upward and leftward.

The support unit 220 rotates clockwise about the rotating shaft 75 (center line C), and rotates the printing table 70 clockwise about the rotating shaft 75 (center line C).

Since the cylinder joint 212 is rotatably attached to the moving table 52 by the U-shaped hook 230, when the supporting part 220 is pushed upward, the inclination angle of the crank cylinder 210 relative to the horizontal direction becomes large.

Since the crankshaft 211 is rotatably attached to the printing table 70 via the support part 220, when the support part 220 is pushed upward, the inclination angle of the crankshaft 211 relative to the horizontal direction increases.

In the bending printing step S30 , the printing table 70 is pushed up by the crank mechanism 200 , thereby rotating the printing table 70 .

When the distance between the pin 221 of the supporting portion 220 and the central axis C is L and the printing table 70 is rotated by K degrees, the arc length P over which the pin 221 moves is as follows.

Arc length P = diameter × pi × ratio of arc to circumference = (2 × radius L) × 3.14 × (K degrees ÷ 360 degrees)

When the pin 221 moves by the arc length P, the control unit 60 moves the crankshaft 211 forward so that the pin 221 moves at a constant speed.

As described in Embodiment 1, when the radius of the arc of the flexion portion 992 is R and the inner angle is K degrees, the flexion portion 992 of the arc length E is moved by the pin 221 by the arc length P. print.

**Modification 1 of Embodiment 2****

●Arrangement of the driving unit 56

In FIG. 13 , although the drive unit 56 is arranged to intersect the flexure portion 992 , it may be arranged only on the left side of the flexure portion 992 or only on the right side of the flexure portion 992 .

In FIG. 14 , the drive unit 56 may be arranged not on the left side of the lower surface of the printing table 70 but in the center of the lower surface.

**Modification 2 of Embodiment 2****

●Link mechanism 30

The link mechanism 30 is not limited to the crank mechanism 200 , and any mechanism may be used as long as it converts linear motion into rotational motion of the printing table centered on the centerline C of the flexure portion 992 .

Although the embodiments and modifications of the present invention have been described above, two or more of these embodiments and modifications may be implemented in combination. Alternatively, one of these embodiments and modified examples may be partially implemented. It is also possible to partially combine two or more of these embodiments and modifications. In addition, this invention is not limited to these embodiment and modification, Various changes are possible as needed.

51: frame

52: mobile station

53: Pillar

54: Cylinder

55: stopper

56: Drive Department

58: teeth

60: Control Department

61: signal line

70: printing table

71: Bottom plate

72: Bracket

73: Front support plate

74: Rear support plate

75: axis of rotation

77: gear

78: teeth

91: screen version

92: scraper

99: Workpiece

100: printing device

561: sliding table

562: Rack

C: Centerline

Claims (13)

A printing device that uses a scraper and a screen plate for screen printing; it includes: a printing table on which a workpiece having a curved section with a circular arc formed by a vertical plane parallel to the printing direction is placed; a pillar The rotating shaft of the above-mentioned printing table can be installed so that it can rotate around the center line of the above-mentioned bending part; the driving part rotates the above-mentioned rotating shaft around the above-mentioned center line to rotate the above-mentioned printing table; The above-mentioned pillar and the above-mentioned driving part are fixed; the frame body is installed so that the above-mentioned mobile table can move in the left and right directions; and the control part controls the screen printing; and when printing on the bending part of the above-mentioned workpiece, The control unit moves the squeegee relative to the screen plate toward the printing direction by a distance of the arc length of the bending portion, and rotates the printing table on the rotating shaft by the distance of the inner angle of the bending portion by the driving unit. , and make the above-mentioned movable table move relative to the above-mentioned frame body toward the printing direction by the distance of the arc length of the above-mentioned flexure portion, and move the above-mentioned rotating shaft only toward the printing direction by the distance of the arc length of the above-mentioned flexure portion. The printing device according to claim 1, wherein the drive unit has a link mechanism that converts linear motion into rotational motion of the printing table centered on the center line of the flexed portion. Such as the printing device of claim 1 or 2, wherein, The printing table has a fan-shaped gear that rotates the rotation shaft of the printing table, and the drive unit has a rack that has teeth meshing with teeth of the gear to rotate the gear, and a slide table that rotates the gear. The bar is slidably installed in the right and left direction. The printing device according to claim 3, wherein the radius of the above-mentioned gear is larger than the radius of the above-mentioned bending portion. The printing device according to claim 1 or 2, wherein the printing table has a support fixed to the back surface, and the drive unit has a crank mechanism rotatably attached to the support. The printing device according to claim 5, wherein the crank mechanism has a crank shaft and a crank cylinder, the upper end of the crank shaft is rotatably mounted on the support portion, and the lower end of the crank cylinder is rotatably mounted on the moving table. The printing device according to claim 1 or 2, wherein the printing table has brackets fixed on both sides, and the rotation shaft is attached to the bracket at a position serving as a center line of the bending portion. The printing device according to claim 1 or 2, wherein the printing table has: a plate-shaped bottom plate having a front flat portion, a curved portion, and a rear flat portion; a front support plate fixed to the front flat portion; and a rear A support plate is fixed to the rear flat portion; and there is a gap between the front support plate and the rear support plate. The printing device according to claim 1 or 2, further comprising an air cylinder fixed to the moving table to support the printing table. The printing device according to claim 1 or 2, wherein it is equipped with a control unit that controls the printing operation, and when the control unit prints the curved part of the workpiece, the printing table is moved to the center by the driving unit. The moving table linearly moves in the printing direction while rotating around the wire. A printing method, which is a printing method of a printing device equipped with a printing table, a pillar, a driving part, a moving table, a frame and a control part, and uses a scraper and a screen plate to perform screen printing. The printing table is equipped with a front flat part . The workpiece of the bending part and the rear flat part, the support is installed so that the rotation shaft of the above-mentioned printing table can be rotated around the center line of the above-mentioned bending part, and the driving part rotates the above-mentioned rotation shaft around the center line to make The above-mentioned printing table rotates, and the above-mentioned support and the above-mentioned driving part are fixed on the mobile table, and the frame body is installed so that the above-mentioned mobile table can move in the left and right directions, and the control part controls the screen printing; this printing method includes: the first half printing The step of fixing the front half of the printing table on which the front flat part of the workpiece is placed is parallel to the printing direction, and printing the front flat part; the bending printing step of making the printing table take the center line of the bending part of the workpiece as The center is rotated, and the above-mentioned bending part is printed while the above-mentioned printing table is moved in the printing direction relative to the above-mentioned frame; and the second half of the printing step is to fix the rear half of the above-mentioned printing table on which the rear flat part of the workpiece is placed to be parallel to the printing direction , and print the aforementioned back flat; and In the flexure printing step, the control unit moves the squeegee relative to the screen plate toward the printing direction by an arc length of the flexure portion, and rotates the printing table on the rotation shaft by the drive unit. The distance of the inner corner of the bending part, and the distance of the arc length of the bending part moving the above-mentioned moving table relative to the above-mentioned frame towards the printing direction and the distance of the arc length of the bending part moving the above-mentioned rotating shaft only in the printing direction . The printing method according to claim 11, wherein in the bending printing step, the printing table is rotated by aligning the rotation axis with the center line of the bending portion and rotating a gear having a radius larger than that of the bending portion. rotate. The printing method according to claim 11, wherein the above-mentioned bending printing step uses a crank mechanism to push up the above-mentioned printing table, so that the above-mentioned printing table is rotated.

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