Screen printing machine

Abstract

Provided is a screen printing machine capable of reducing a load applied to a drive source in a printing process.　A screen printing machine according to the present disclosure is provided with: a squeegee member; a squeegee holder that holds the squeegee member; a holder drive unit that drives, on the basis of the drive of a drive source, the squeegee holder so as to rotate about the tip of the squeegee member; and a control device that controls the drive source. The control device executes: an angle change process for controlling the drive source to rotate the squeegee member about the tip thereof and change the rotation angle of the squeegee member; and a printing process for sliding the squeegee member on a screen mask and printing a viscous fluid in a state where power transmitted from the drive source to the squeegee holder is reduced after executing the angle change process.

Description

Screen printing machine

[0001] The present disclosure relates to a screen printing machine.

[0002] Conventionally, various techniques for changing the angle of the squeegee member of a screen printing machine have been proposed. For example, Patent Document 1 below describes a screen printing machine that changes the angle of a blade (corresponding to the squeegee member of the present disclosure) by raising and lowering two elevating shafts. In the screen printing machine of Patent Document 1, a swing member is attached to the lower ends of the two elevating shafts. The swing member has a blade attached thereto, and rotates according to the positions of the two elevating shafts in the vertical direction to change the angle of the blade.

[0003] International Publication No. 2019 / 208213

[0004] Incidentally, a screen printing machine prints a viscous fluid (such as solder) applied on a screen mask through the pattern holes of the screen mask by sliding a blade on the screen mask. In this printing process, the blade is preferably maintained at a predetermined angle in order to make the transfer amount uniform. However, in the printing process, a load is applied to the blade due to contact with the solder or the screen mask. Therefore, for example, when a motor is used as a drive source for changing the angle of the blade, it is necessary to pass an electric current through the winding of the motor to excite it during the printing process and maintain the rotational position of the motor against the load transmitted from the blade to the motor. As a result, there is a problem that the life of the motor is shortened by continuing the excitation during the printing process.

[0005] The present disclosure has been made in view of the above problems, and an object thereof is to provide a screen printing machine capable of reducing the load applied to the drive source during the printing process.

[0006] To solve the above problems, this specification discloses a screen printing machine comprising: a squeegee member; a squeegee holder for holding the squeegee member; a holder drive unit for driving the squeegee holder so as to rotate around the tip of the squeegee member based on the drive of a drive source; and a control device for controlling the drive source, wherein the control device controls the drive source to rotate the squeegee member around its tip and performs an angle change process to change the rotation angle of the squeegee member; and after performing the angle change process, a printing process in which the squeegee member is slid on a screen mask to print a viscous fluid while the power transmitted from the drive source to the squeegee holder is reduced.

[0007] According to the screen printing machine of this disclosure, the control device rotates the squeegee member using a holder drive unit. The holder drive unit drives the squeegee holder to rotate around the tip of the squeegee member based on the drive of the drive source. In other words, the squeegee member rotates around its tip. In this configuration, even if the tip of the squeegee member comes into contact with solder or a screen mask and a load is applied during the printing process, the load applied to the tip is not easily transmitted to the drive source via the squeegee member. Therefore, the load applied to the drive source can be reduced during the printing process. The power applied from the drive source to the squeegee holder, which is necessary to maintain the squeegee member at a predetermined rotation angle during the printing process, can be reduced. Printing can be performed with reduced power applied from the drive source to the squeegee holder, thereby reducing power consumption during the printing process. In addition, the load on the drive source can be reduced, and the progression of deterioration of the drive source can be suppressed.

[0008] A schematic diagram of the screen printing machine 10 according to the first embodiment. An external perspective view of the first squeegee unit 40 according to the first embodiment. An exploded perspective view of the first squeegee unit 40 according to the first embodiment. An exploded perspective view of the first squeegee unit 40 with the rotation guide 118 removed according to the first embodiment. A perspective view of the first squeegee unit 40 with the cover member 119 removed according to the first embodiment. A front view of the first squeegee unit 40 according to the first embodiment, showing the components inside the cover member 119 transparently when viewed from the front. A front view of the first squeegee unit 40 according to the first embodiment. A block diagram of the screen printing machine 10 according to the first embodiment. A view of the first squeegee unit 140 according to the second embodiment, viewed from one side in the left-right direction.

[0009] (First Embodiment) Hereinafter, a first embodiment, which is an embodiment that embodies the contents of this disclosure, will be described with reference to the drawings. Figure 1 is a schematic configuration diagram of the screen printing machine 10 of the first embodiment. The left-right direction in Figure 1 indicates the printing direction, and the front-back direction in Figure 1 indicates the substrate transport direction.

[0010] The screen printing machine 10 of the first embodiment is a device that prints solder S on a screen mask M onto a substrate P below the screen mask M by rolling the solder S on the screen mask M with a squeegee (first squeegee member 43 or second squeegee member 53) to push the solder S into pattern holes H formed in the screen mask M. As shown in Figure 1, this screen printing machine 10 includes a housing 11, a substrate transport device 21, a backup device 25, a screen mask stand 12, a print head 30, and a control device 90. The viscous fluid applied by the screen printing machine 10 is not limited to solder S, but may also be other viscous fluids such as adhesives or conductive pastes. Therefore, the screen printing machine of this disclosure is not limited to a device that prints solder S onto a substrate P using a screen mask M, but can also be a device that prints other viscous fluids on the printing target using a screen mask M, such as adhesives or conductive pastes.

[0011] As shown in Figure 1, the substrate transport device 21 is located in the lower part of the housing 11. The substrate transport device 21 has a lane 22 extending from the front to the back in Figure 1, and transports the substrate P along the lane 22 by the drive of a belt conveyor device. The backup device 25 is located in the lower part of the housing 11. The backup device 25 includes a backup table 26 that can move up and down by a lifting device (not shown), and backup pins 27 that are installed in multiple locations on the backup table 26 to back up the substrate P from the back side.

[0012] The screen mask stand 12 is located in the middle section of the housing 11 and supports the screen mask M in a horizontal position. The print head 30 is located in the upper section of the housing 11. The print head 30 comprises a head body 31, a first squeegee unit 40, a second squeegee unit 50, and a head moving device 80 that moves the head body 31 horizontally (in the printing direction).

[0013] The head body 31 includes a first squeegee lifting device 60 for raising and lowering the first squeegee unit 40, and a second squeegee lifting device 70 for raising and lowering the second squeegee unit 50. The first squeegee lifting device 60 includes a first lifting shaft 61, a ball screw nut 62, and a motor 63. The first lifting shaft 61 includes a ball screw shaft that extends vertically and is held in the head body 31 so as to be rotatable and vertically movable. The ball screw nut 62 is screwed onto the first lifting shaft 61 (ball screw shaft) and is also held in the head body 31 so as to be rotatable. The motor 63 is fixed to the head body 31 and rotates the ball screw nut 62 in both forward and reverse directions. The first squeegee lifting device 60 lowers the first lifting shaft 61 by driving the motor 63 to rotate the ball screw nut 62 in the forward direction, and raises the first lifting shaft 61 by driving the motor 63 to rotate the ball screw nut 62 in the reverse direction.

[0014] The second squeegee lifting device 70 comprises a second lifting shaft 71, a ball screw nut 72, and a motor 73. The second squeegee lifting device 70 has the same configuration as the first squeegee lifting device 60. Therefore, a detailed explanation of the second squeegee lifting device 70 is omitted. The second squeegee lifting device 70 raises and lowers the second lifting shaft 71 by driving the motor 73.

[0015] The head moving device 80 comprises a moving shaft 81, a ball screw nut 82, and a motor 83. The moving shaft 81 includes a ball screw shaft extending horizontally (in the printing direction) and is fixed to the upper part of the housing 11. The ball screw nut 82 is screwed onto the moving shaft 81 (ball screw shaft) and is rotatably held by the head body 31. The motor 83 is fixed to the head body 31 and rotates the ball screw nut 82 in both forward and reverse directions. The head moving device 80 moves the head body 31 to one side in the printing direction by driving the motor 83 to rotate the ball screw nut 82 in the forward direction, and moves the head body 31 to the other side in the printing direction by driving the motor 83 to rotate the ball screw nut 82 in the reverse direction.

[0016] The first squeegee unit 40 is detachably attached to the first lifting shaft 61 and moves up and down together with the first lifting shaft 61. Figure 2 is an external perspective view of the first squeegee unit 40, and Figure 3 is an exploded perspective view of the first squeegee unit 40. As shown in Figures 2 and 3, the first squeegee unit 40 includes a first squeegee holder support plate 41, a first squeegee holder 42, a first squeegee member 43, and a first holder drive unit 45. Note that Figure 3 shows the unit with some components, such as the cover member 119 and gear cover 121, which will be described later, removed. Furthermore, the following description will be based on the orientation of the first squeegee unit 40 when it is attached to the screen printing machine 10.

[0017] The first squeegee holder support plate 41 generally has a roughly rectangular parallelepiped shape that extends in the front-rear direction. The first squeegee holder support plate 41 is attached to the first lifting shaft 61 and moves up and down together with the first lifting shaft 61. For example, the first squeegee holder support plate 41 is attached to the first lifting shaft 61 by engaging two mounting members 46 attached to the upper surface of the first squeegee holder support plate 41 with engagement grooves (not shown) provided on the first lifting shaft 61.

[0018] A holder holding portion 47 is positioned at the lower part of the first squeegee holder support plate 41. The holder holding portion 47 is, for example, a plate-shaped structure that has a predetermined thickness in the vertical direction, a substantially constant width in the horizontal direction, and extends in the front-to-back direction. The holder holding portion 47 is rotatably held relative to the first squeegee holder support plate 41 by the drive of the first holder drive unit 45. The holder holding portion 47 rotates around a rotation axis parallel to the front-to-back direction.

[0019] The first squeegee holder 42 is fixed to the holder holding portion 47 by, for example, a plurality (three in this embodiment) of screw-fastening members 48. The screw-fastening members 48 are, for example, bolts. Note that the screw-fastening members are not limited to bolts, but may be other screwable members such as screws. Furthermore, the method of fixing the first squeegee holder 42 to the holder holding portion 47 is not limited to the method using screw-fastening members, but may also be a method of fixing the first squeegee holder 42 by clamping it, or by wrapping it with a belt or the like.

[0020] Furthermore, the first squeegee member 43 is held by the first squeegee holder 42. Therefore, the first squeegee member 43 rotates integrally with the holder holding part 47 while being fixed to the holder holding part 47 via the first squeegee holder 42. The first squeegee holder 42 and the first squeegee member 43 are rotatable with respect to the first squeegee holder support plate 41 about a rotation axis parallel to the front-rear direction.

[0021] The first squeegee member 43 is formed of an elastic material such as urethane. The material of the first squeegee member 43 is not particularly limited and may be made of metal. The first squeegee member 43 is a thin rectangular plate that is long in one direction. When the first squeegee member 43 is attached to the screen printing machine 10, it is thin in the left-right direction, has a predetermined width in the up-down direction, and is a rectangle that is long in the front-back direction. Therefore, the front-back direction is just one example of the longitudinal direction of the squeegee member of this disclosure.

[0022] The first squeegee holder 42 holds the first squeegee member 43, for example, by clamping its upper end. The first squeegee holder 42 has a holder body 42A, a clamping portion 42B that is detachable from the holder body 42A, and a plurality of screw-in members 42C. The holder body 42A and the clamping portion 42B have approximately the same length as the first squeegee member 43 in the front-rear direction. The clamping portion 42B is fixed to the holder body 42A from the right side by the plurality of screw-in members 42C. The first squeegee holder 42 holds the first squeegee member 43 by screwing the plurality of screw-in members 42C between the holder body 42A and the clamping portion 42B, with the upper end of the first squeegee member 43 clamped between them. The first squeegee member 43 is mounted, for example, at a predetermined angle inclined relative to the first squeegee holder 42.

[0023] Furthermore, the first squeegee unit 40 includes a pair of guide members 107 and a pair of brackets 108. The pair of brackets 108 are attached to both ends of the first squeegee holder support plate 41 in the front-rear direction. The pair of guide members 107 are attached to each of the pair of brackets 108. The pair of guide members 107 are positioned outside the first squeegee holder 42 and the first squeegee member 43 in the front-rear direction. The pair of guide members 107, for example, contact the upper surface of the screen mask M during the printing process and support the first squeegee unit 40 so that it is horizontal with respect to the screen mask M.

[0024] Furthermore, the method for fixing the first squeegee member 43 to the first squeegee holder 42 is not particularly limited, similar to the method for fixing the first squeegee holder 42 to the holder holding portion 47 described above. Therefore, various screw-type members such as bolts and screws can be used as the screw-type member 42C. In addition, the first squeegee member 43 may be fixed to the first squeegee holder 42 by welding or the like. That is, the first squeegee member 43 may be configured in such a way that it cannot be removed from the first squeegee holder 42 and replaced.

[0025] As shown in Figures 2 to 7, the first holder drive unit 45 includes a first drive unit 101, a second drive unit 102, a connecting shaft 103, a servo motor 104, and an encoder 105. The first drive unit 101 is attached to the front end of the first squeegee holder support plate 41 in the front-rear direction.

[0026] The first drive unit 101 includes a main body 111, a drive source gear 113, intermediate gears 114 and 115, a squeegee gear 117, a rotation guide 118, a cover member 119, and a gear cover 121. The main body 111 is, for example, shaped like a roughly rectangular plate-shaped metal member bent into an L-shape, and its short side is fixed to the upper surface of the front end of the first squeegee holder support plate 41. The long side of the main body 111 protrudes upward from the upper surface of the first squeegee holder support plate 41 with the front-to-back direction as the thickness direction, and is mounted with its plane aligned in the vertical and horizontal directions.

[0027] The servo motor 104 is mounted on the rear surface of the long side of the main body 111 and its rotation is controlled by the control device 90. The drive source gear 113 is mounted on the front surface 111A of the long side of the main body 111 and is fixed to the output shaft 104A of the servo motor 104, and rotates at the same rotation angle as the output shaft 104A as the servo motor 104 rotates. The drive source gear 113 has an annular portion 113A, a plate-shaped portion 113B, and a toothed portion 113C. The annular portion 113A is annular in shape and is fixed to a pulley attached to the output shaft 104A of the servo motor 104 by a plurality of screw members 113D.

[0028] The plate-shaped portion 113B has a shape that protrudes outward along the radial direction from the circular outer edge of the annular portion 113A. When the annular portion 113A is attached to the output shaft 104A, the plate-shaped portion 113B is positioned to protrude downward from the annular portion 113A. The teeth portion 113C is formed at the tip of the plate-shaped portion 113B and is formed along the short side of the tip. The drive source gear 113 is attached with the teeth portion 113C meshed with the intermediate gear 114.

[0029] The intermediate gear 114 is mounted on the front surface 111A and is rotatably mounted relative to the main body 111. The connecting shaft 103 has a long cylindrical shape in the front-rear direction, and is positioned with its axial direction parallel to the front-rear direction, and is rotatably held by the first squeegee holder support plate 41. The front end of the connecting shaft 103 protrudes forward from the front end 41A of the first squeegee holder support plate 41. The intermediate gear 115 is mounted on the portion of the connecting shaft 103 that protrudes forward from the front end 41A and rotates together with the connecting shaft 103. In the vertical direction, the intermediate gear 114 is positioned between the teeth 113C of the drive source gear 113 and the intermediate gear 115, and meshes with the teeth 113C and the intermediate gear 115. The intermediate gear 115 is a smaller diameter gear than the intermediate gear 114 and is positioned below the intermediate gear 115.

[0030] As shown in Figure 6, the squeegee gear 117 has a rack portion 117A and a tooth portion 117B. The rack portion 117A is a plate-shaped member having a predetermined thickness in the vertical direction and has a curved shape with a predetermined curvature. When viewed from the front, the rack portion 117A has an arc shape that bulges upward. The tooth portion 117B is formed on the upper surface of the rack portion 117A, at the front end portion of the rack portion 117A. The tooth portion 117B has a plurality of teeth formed at predetermined intervals along a curve with the same curvature as the rack portion 117A. Therefore, when viewed from the front, the teeth of the tooth portion 117B are arranged in an arc shape that bulges upward. The upper end of the rack portion 117A and the tooth portion 117B are formed along the circumference 125A of a predetermined radius R1 centered on the tip 43A (lower end) of the first squeegee member 43 attached to the first squeegee holder 42. The teeth 117B are positioned below the intermediate gear 115 and mesh with the intermediate gear 115.

[0031] As shown in Figures 3 and 4, the rear end of the squeegee gear 117 is attached to the front end 47A of the holder holding portion 47. The squeegee gear 117 is fixed at its rear end to the holder holding portion 47 and protrudes forward from the front end 47A. The rotation guide 118 is attached to the front surface of the front end 41A of the first squeegee holder support plate 41 and holds the squeegee gear 117 relative to the first squeegee holder support plate 41. Therefore, the front end 47A of the holder holding portion 47 is held by the first squeegee holder support plate 41 via the squeegee gear 117 and the rotation guide 118.

[0032] The rotary guide 118 is attached to the front end 41A so as to cover the front surface of the squeegee gear 117. The rotary guide 118 is fixed to the first squeegee holder support plate 41 by inserting a plurality of (two in this embodiment) bolts 123 from the front and screwing the two bolts 123 into the front end 41A.

[0033] As shown in Figures 3 to 6, the rotating guide 118 has a housing portion 118A for housing the intermediate gear 115. The housing portion 118A is a substantially semicircular groove that follows the outer circumference shape of the intermediate gear 115, and is formed with an inner diameter larger than that of the intermediate gear 115. It is cut out in an arc shape from the upper end of the rotating guide 118 downwards. At the rear end of the housing portion 118A, a through hole 118B is formed for inserting a connecting shaft 103 that supports the intermediate gear 115. The front end of the connecting shaft 103 protrudes forward from the front surface of the front end 41A and is rotatably held by the first squeegee holder support plate 41 while inserted into the through hole 118B. The intermediate gear 115 is attached to the front end of the connecting shaft 103 that protrudes forward from the through hole 118B. The intermediate gear 115 is positioned with a gap between it and the inner circumferential surface of the housing portion 118A and is rotatably housed within the housing portion 118A.

[0034] The intermediate gear 115 meshes with the intermediate gear 114 at the opening in the upper part of the housing 118A. A through hole 118C is formed at the bottom of the housing 118A. The through hole 118C is formed to match the position where the intermediate gear 115 meshes with the teeth 117B of the squeegee gear 117. The intermediate gear 115 meshes with the teeth 117B through this through hole 118C. An opening is also formed on the front surface of the housing 118A, and the front surface of the intermediate gear 114 is exposed through the opening of the housing 118A.

[0035] Furthermore, the rotating guide 118 has a sliding portion 118D formed along the arc shape of the rack portion 117A and tooth portion 117B of the squeegee gear 117. The sliding portion 118D is formed below the housing portion 118A and is roughly plate-shaped, protruding rearward from the rear surface of the rotating guide 118. The upper surface of the sliding portion 118D is formed along the circumference 125B of a predetermined radius R2 centered on the tip 43A of the first squeegee member 43, for example, similar to the rack portion 117A and tooth portion 117B (see Figure 6). When the rotating guide 118 is attached to the first squeegee holder support plate 41, the sliding portion 118D supports the rack portion 117A of the squeegee gear 117 from below and holds the squeegee gear 117 so that it can slide in an arc shape.

[0036] As shown in Figure 6, the teeth 117B of the rack portion 117A are formed along a circumference 125A with a predetermined radius R1 centered on the tip 43A of the first squeegee member 43, when viewed from one side in the front-rear direction with the first squeegee holder 42 attached to the holder holding portion 47. In other words, the squeegee gear 117 is held by the rotation guide 118 such that the teeth 117B are aligned along the circumference 125A. The center of the circumference 125A along the arc shape of the teeth 117B is at the position of the tip 43A of the first squeegee member 43. Also, the upper surface of the slide portion 118D is formed along a circumference 125B with a radius R2, which is smaller than radius R1. The squeegee gear 117 is supported by the lower surface of the rack portion 117A being in contact with the upper surface of the slide portion 118D, and rotates (slides) along the circumference 125B. As a result, the front end of the holder holding portion 47 is held by the squeegee gear 117 and the rotation guide 118, and is rotatably held with respect to the first squeegee holder support plate 41. That is, the front end of the first squeegee member 43 is held by the first squeegee holder 42 so as to rotate around its tip 43A.

[0037] Furthermore, as shown in Figure 6, the gear diameter R3 of the drive source gear 113 is shorter than the radius R1, that is, the gear diameter of the teeth 117B of the squeegee gear 117. The gear diameter R3 is the distance from the rotation center 113E (output shaft 104A) of the drive source gear 113 to the teeth 113C (the position where the teeth 113C mesh with the intermediate gear 114). In other words, the teeth 113C moves around the rotation center 113E and along the circumference 125C of the gear diameter R3 in response to the drive of the servo motor 104. With this configuration, the first squeegee member 43 can be rotated with a small motor torque when changing the rotation angle θ of the first squeegee member 43. A less expensive motor can be used as the servo motor 104. Also, by making the radius R1 longer than the gear diameter R3, the rotational torque generated in the first squeegee member 43 during printing is less likely to be transmitted to the servo motor 104. Furthermore, the radius R1 may be the same length as the gear diameter R3, or it may be shorter than the gear diameter R3.

[0038] Next, the second drive unit 102 will be described. In the following description of the second drive unit 102, explanations of the same content as those described above for the first drive unit 101 will be omitted as appropriate. The second drive unit 102 is attached to the rear end of the first squeegee holder support plate 41 in the front-rear direction. The second drive unit 102 includes an intermediate gear 215, a squeegee gear 217, a rotation guide 218, and a cover member 219. Therefore, in the first embodiment, the first holder drive unit 45 is equipped with a servo motor 104 in the first drive unit 101, but the second drive unit 102 is not equipped with a drive source such as a motor. Figures 3 to 5 show the state with the cover member 219 removed.

[0039] The rear end of the connecting shaft 103 protrudes rearward from the rear end of the first squeegee holder support plate 41. The intermediate gear 215, like the intermediate gear 115 of the first drive unit 101, is attached to the rear end of the connecting shaft 103 and rotates together with the connecting shaft 103. Therefore, the two intermediate gears 115 and 215 are connected to each other by the connecting shaft 103 and rotate synchronously. The squeegee gear 217 has the same shape as the squeegee gear 117, for example, and has a rack portion and a tooth portion, and has a curved shape with a predetermined curvature. The teeth of the squeegee gear 217 are formed along the circumference 125A of a predetermined radius R1 centered on the tip 43A of the first squeegee member 43, similar to the squeegee gear 117.

[0040] The front end of the squeegee gear 217 is attached to the rear end 47B of the holder holding portion 47. The rotary guide 218 has the same shape as, for example, the rotary guide 118 of the first drive unit 101 and is attached to the rear surface of the rear end of the first squeegee holder support plate 41 by two bolts 223, and holds the squeegee gear 217 with respect to the first squeegee holder support plate 41. Therefore, the rear end 47B of the holder holding portion 47 is held by the first squeegee holder support plate 41 via the squeegee gear 217 and the rotary guide 218.

[0041] The rotating guide 218 has a housing section for accommodating the intermediate gear 215. The rear end of the connecting shaft 103 is inserted into a through hole formed in the rotating guide 218 and is rotatably held by the first squeegee holder support plate 41. The intermediate gear 215 is attached to the rear end of the connecting shaft 103 that protrudes rearward from this through hole and is rotatably housed within the housing section of the rotating guide 218.

[0042] Furthermore, the rotary guide 218 has a sliding portion formed along the arc shape of the rack portion of the squeegee gear 217. The upper surface of the sliding portion of the rotary guide 218 is formed along the circumference 125B of a predetermined radius R2 centered on the tip 43A of the first squeegee member 43, similar to the upper surface of the sliding portion 118D of the rotary guide 118. When the rotary guide 218 is attached to the first squeegee holder support plate 41, the sliding portion supports the rack portion of the squeegee gear 217 from below and holds the squeegee gear 217 so that it can slide in an arc shape. As a result, the rear end of the holder holding portion 47 is held by the squeegee gear 217 and the rotary guide 218, and is rotatably held relative to the first squeegee holder support plate 41. The first squeegee holder 42 and the first squeegee member 43 are held at both ends in the front-rear direction by the rotary guides 118 and 218, respectively, and are rotatably held relative to the first squeegee holder support plate 41.

[0043] Furthermore, as shown in Figures 2 and 7, the cover member 119 has a box-like shape that covers all the gears, such as the servo motor 104 and the drive source gear 113. The gear cover 121 is attached to, for example, the intermediate gear 114 and rotates together with the intermediate gear 114. The gear cover 121 has a bottomed cylindrical shape and is attached to the intermediate gear 114 so as to cover the front surface of the intermediate gear 114. A scale indicator mark 121A is provided on the front surface of the gear cover 121. The scale indicator mark 121A is, for example, a triangular mark that points to the scale 131 provided on the cover member 119.

[0044] The cover member 119 has a circular through-hole formed in accordance with the position of the gear cover 121. A scale 131 is provided at the opening of the through-hole in the cover member 119. The scale 131 is provided, for example, along the opening of the through-hole, and scales from 65 degrees to 50 degrees are provided. This number and scale indicate the rotation angle θ (see FIG. 6) of the first squeegee member 43. The gear cover 121 rotates as the intermediate gear 114 rotates, and the scale indication mark 121A indicates the scale 131 corresponding to the rotation angle θ of the first squeegee member 43. For example, when the first squeegee member 43 is attached to the first squeegee holder 42, the posture of the first squeegee member 43 is fixed at a predetermined angle by the holder main body portion 42A and the clamping portion 42B. Then, when the first squeegee holder 42 to which the first squeegee member 43 is attached is attached to the holder holding portion 47, the rotation angle θ of the first squeegee member 43 is configured to coincide with the rotation angle of the scale 131 indicated by the scale indication mark 121A.

[0045] Therefore, the first holder drive unit 45 of the present embodiment is provided at the front end in the front-rear direction (the longitudinal direction of the first squeegee member 43). The cover member 119 is provided with a scale 131 indicating the rotation angle θ of the first squeegee member 43. The gear cover 121 rotates as the drive source gear 113 rotates, and is provided with a scale indication mark 121A indicating the scale 131 provided on the cover member 119. The cover member 119 covers the drive source gear 113 from the front (outer side) in the front-rear direction of the first squeegee member 43. According to this, when the user views the first squeegee unit 40 from one side in the front-rear direction (front in this embodiment), the scale 131 and the scale indication mark 121A can be seen, and the rotation angle θ of the first squeegee member 43 can be visually confirmed. The rotation angle θ of the first squeegee member 43 can be easily confirmed from outside the machine of the screen printing machine 10.

[0046] The above-described configuration of the first holder drive unit 45 is merely an example. For example, the first drive unit 101 may be configured without one of the intermediate gears 114 and 115. If both intermediate gears 114 and 115 are omitted, the teeth 113C of the drive source gear 113 may be meshed with the teeth 117B of the squeegee gear 117. The number of intermediate gears 114 and 115 may be three or more. The drive source gear 113 may also be configured without a plate-shaped portion 113B, with the teeth 113C formed on the outer circumference of the annular portion 113A. The gear cover 121 may also be attached to a gear other than the intermediate gear 114, for example, the drive source gear 113. Furthermore, the first holder drive unit 45 may be configured without a gear cover 121. In this case, the scale 131 does not need to be provided on the cover member 119. Furthermore, the first holder drive unit 45 may be configured to include the first drive unit 101 but not the second drive unit 102 or the connecting shaft 103. In this case, the first drive unit 101 may be mounted in the center of the first squeegee holder support plate 41 in the front-rear direction.

[0047] Furthermore, as shown in Figure 6, the drive source gear 113 and intermediate gears 114, 115 of this embodiment are configured to fit within the width of the main body 111 in the left-right direction. The size of the drive source gear 113 and intermediate gears 114, 115 in the left-right direction is less than or equal to the size of the main body 111 in the left-right direction. In addition, the entirety of each gear is positioned opposite the front surface 111A of the main body 111 in the front-rear direction. Moreover, the plate-shaped portion 113B of the drive source gear 113 does not move (protrude) beyond the main body 111 in the left-right direction, regardless of the rotation angle θ of the first squeegee member 43 within the adjustment range for adjusting the rotation angle θ (a range from 65 to 50 degrees in this embodiment). In other words, the plate-shaped portion 113B rotates within the range of positions opposite the main body 111 in the front-rear direction. This makes it possible to make the length of the cover member 119 in the left-right direction approximately the same as that of the main body 111. The first drive unit 101 can be made smaller, and the first squeegee unit 40 and the second squeegee unit 50 can be positioned closer together in the left-right direction. As a result, the print head 30 can be made smaller. Alternatively, each gear may be made larger than the main body 111 in the left-right direction, or a part of the plate-shaped portion 113B may move outward in the left-right direction compared to the main body 111 during rotational operation.

[0048] Further, the second squeegee unit 50 has the same configuration as the first squeegee unit 40. For example, the second squeegee unit 50 has a plane-symmetric configuration with respect to the first squeegee unit 40 with respect to a plane passing through the midpoint between the first and second squeegee units 40 and 50 in the left-right direction and parallel to the vertical and front-back directions. Therefore, a detailed description of the second squeegee unit 50 will be omitted. The second squeegee unit 50 is detachably attached to the second elevating shaft 71 and moves up and down together with the second elevating shaft 71. The second squeegee unit 50 includes a second holder driving unit 55. The second holder driving unit 55, similar to the first holder driving unit 45, includes a first driving unit, a second driving unit, a connecting shaft, a servo motor 124 (see FIG. 8), and an encoder 125 (see FIG. 8). The second squeegee unit 50 drives the servo motor 124 of the second holder driving unit 55 to rotate the second squeegee member 53 about the tip of the second squeegee member 53. For example, the rotation range of the second squeegee member 53 is symmetric with the rotation range of the first squeegee member 43 in the left-right direction.

[0049] Further, as shown in FIG. 8, the screen printing machine 10 includes a touch panel 85. The control device 90 displays information related to the screen printing machine 10 on the touch panel 85 and executes processing according to an operation input to the touch panel 85. Note that the user interface included in the screen printing machine 10 is not limited to the touch panel 85, and may be a combination of a monitor and a switch or the like. The control device 90 includes, for example, a CPU 90A and a storage device 90B, and is a processing board centered on the CPU 90A. The storage device 90B includes, for example, a RAM, a ROM, a flash memory, etc., and stores a control program PG. The control device 90 is connected to each device of the screen printing machine 10. Here, each device of the screen printing machine 10 refers to the substrate transfer device 21, the backup device 25, the printing head 30, and the touch panel 85 described above. The control device 90 controls the operation of each device of the screen printing machine 10 by executing the control program PG stored in the storage device 90B with the CPU 90A.

[0050] In the screen printing machine 10 with the above configuration, the control device 90 controls the first and second squeegee lifting devices 60 and 70 to lower the first squeegee member 43 and raise the second squeegee member 53, and then controls the motor 83 of the head moving device 80 to move the head body 31 horizontally to one side in the printing direction, thereby moving the solder S on the screen mask M to one side in the printing direction and performing printing (forward printing). Furthermore, the control device 90 controls the first and second squeegee lifting devices 60 and 70 to lower the second squeegee member 53 and raise the first squeegee member 43, and then controls the motor 83 of the head moving device 80 to move the head body 31 horizontally to the other side in the printing direction, thereby moving the solder S on the screen mask M to the other side in the printing direction and performing printing (backward printing).

[0051] As described above, the control device 90 slides the first squeegee member 43 on the screen mask M and performs a printing process to print solder S. Before starting the printing process, the control device 90 drives the servo motor 104 of the first holder drive unit 45 to change the rotation angle θ of the first squeegee member 43. The rotation angle θ of the first squeegee member 43 is set according to the amount of solder S transferred to the substrate P through the pattern holes H of the screen mask M. For this reason, the rotation angle θ of the first squeegee member 43 is set according to the thickness of the screen mask M, the size of the pattern holes H, the viscosity of the solder S, etc.

[0052] For example, the user sets the rotation angle θ by operating the touch panel 85. The control device 90 controls the first squeegee lifting device 60 to position the first squeegee member 43 at a height corresponding to the set rotation angle θ. The control device 90 also drives the servo motor 104 to rotate the first squeegee member 43, setting the rotation angle θ of the first squeegee member 43 to the set rotation angle θ. When the servo motor 104 is driven, the drive source gear 113 rotates. The intermediate gears 114, 115 and the squeegee gear 117 rotate according to the rotation angle of the drive source gear 113. In addition, the intermediate gear 215 of the second drive unit 102 rotates in sync with the intermediate gear 115 via the connecting shaft 103. Therefore, the squeegee gears 117 and 217 operate in conjunction with the rotation of the connecting shaft 103 and rotate in sync. As a result, the first squeegee member 43 rotates around a rotation axis parallel to the front-rear direction and passing through the tip 43A in response to the drive of the servo motor 104. The first squeegee member 43 rotates with its plane parallel to the front-rear direction by the synchronous rotation of both ends by the first and second drive units 101 and 102. The tip 43A of the first squeegee member 43 is maintained parallel to the front-rear direction during the rotation of the first squeegee member 43. The control device 90 controls the servo motor 104 based on the encoder information of the encoder 105 to rotate the first squeegee member 43 around the tip 43A and performs an angle change process to change the rotation angle θ of the first squeegee member 43 to a set rotation angle θ. After performing the angle change process and changing the rotation angle θ of the first squeegee member 43 to the desired rotation angle θ, the control device 90 performs the forward printing process while maintaining the rotation angle θ of the first squeegee member 43.

[0053] Although a detailed explanation will be omitted, the control device 90 performs the same processing as for forward printing during double-action printing. The control device 90 changes the height and rotation angle θ of the second squeegee member 53 based on the rotation angle θ set by the user. The second squeegee member 53 rotates around its tip. After changing the rotation angle θ, the control device 90 performs the double-action printing process while maintaining the rotation angle θ of the second squeegee member 53.

[0054] Accordingly, the first holder drive unit 45 of this embodiment has a first drive unit 101 provided at the front end of the first squeegee member 43 and a second drive unit 102 provided at the rear end. In the angle change process, the control device 90 controls the servo motor 104 and links the first and second drive units 101 and 102 to change the rotation angle θ of the first squeegee member 43. As a result, the first drive unit 101 and the second drive unit 102 are provided at each end of the first squeegee member 43 in the longitudinal direction. The first and second drive units 101 and 102 rotate the first squeegee member 43 at each end of the first squeegee member 43 and rotate the first squeegee member 43 in conjunction with each other. This makes it possible to rotate the first squeegee member 43 to a desired rotation angle θ with high precision.

[0055] Furthermore, the first holder drive unit 45 has a connecting shaft 103 that connects the first drive unit 101 and the second drive unit 102. The servo motor 104 is provided in the first drive unit 101. The first holder drive unit 45 transmits the power of the servo motor 104 provided in the first drive unit 101 to the second drive unit 102 via the connecting shaft 103, thereby linking the first and second drive units 101 and 102. With this configuration, the first holder drive unit 45 has a drive source only in the first drive unit 101, and links the first and second drive units 101 and 102 via the connecting shaft 103. By using only one drive source, the control content can be simplified compared to a configuration with multiple drive sources (see the second embodiment in Figure 9). In addition, by reducing the number of required drive sources, manufacturing costs can be reduced.

[0056] In the printing process, as shown by the thick arrow in Figure 6, the tip 43A of the first squeegee member 43 is subjected to a load due to contact with the solder S and the screen mask M. If there is a risk that the first squeegee member 43 will rotate due to the load and deviate from the set rotation angle θ, then, for example, in the printing process, it is necessary to energize the windings of the servo motor 104 and generate rotational torque from the servo motor 104 to the first squeegee member 43 via the drive source gear 113 to maintain the posture (rotation angle θ) of the first squeegee member 43 against the load of the solder S, etc.

[0057] In contrast, the first squeegee unit 40 of the first embodiment holds the first squeegee member 43 so that it can rotate around its tip 43A as the center of rotation. In other words, the tip 43A, to which a load is applied from the solder S, etc., is the center of rotation of the first squeegee member 43. Therefore, no rotational moment is generated in the first squeegee member 43 due to the load from the solder S, etc. Or, even if one is generated, the magnitude of the generated rotational moment is extremely small. Even if a load is generated in the first squeegee member 43 during the printing process, that load is not transmitted to the intermediate gears 114, 115 or the drive source gear 113 via the first squeegee member 43. The load on the servo motor 104 can be reduced to zero or extremely small. The servo motor 104 can be turned off during the printing process, or the rotational driving force of the servo motor 104 can be reduced compared to when the angle is changed, etc.

[0058] The control device 90 reduces the power transmitted from the servo motor 104 to the first squeegee holder 42 during the printing process, and slides the first squeegee member 43 on the screen mask M to print solder S. For example, the control device 90 turns off the power supply to the windings of the servo motor 104 (stops the power supply) and performs printing with the servo motor 104 turned off. This allows printing to be performed with a reduced power transmission from the servo motor 104 to the first squeegee holder 42 compared to when the angle is changed. This reduces the load applied to the servo motor 104 during the printing process. It also reduces power consumption during the printing process.

[0059] Preferably, the rotation angle θ of the first squeegee member 43 does not shift due to external forces during printing or angle change processing. If the rotation angle θ of the first squeegee member 43 does not shift, there is no need to check the rotation angle θ of the first squeegee member 43 using encoder information from the encoder 105. For this reason, the screen printing machine 10 may be configured without an encoder 105. Also, a motor without an encoder 105 (such as a stepping motor) can be used as the drive source for the first holder drive unit 45.

[0060] Furthermore, the second squeegee unit 50 is configured to rotate the second squeegee member 53 around its tip, similar to the first squeegee unit 40. In the printing process, the control device 90 reduces the power transmitted from the servo motor 124 of the second drive unit 102 to the squeegee holder of the second squeegee unit 50, and slides the second squeegee member 53 on the screen mask M to print the solder S. For example, the control device 90 performs the printing process using the second squeegee member 53 with the servo motor 124 turned off.

[0061] Furthermore, the angle change process and printing process described above are merely examples. For example, the control device 90 does not have to completely stop the power supply to the servo motor 104 windings during the printing process. For example, the control device 90 may reduce the power transmitted from the servo motor 104 to the first squeegee member 43 by supplying a current value smaller than the current value supplied to the windings during the angle change process during the printing process. Also, the method of turning off the motor drive is not limited to stopping the power supply to the windings. For example, the motor drive may be turned off by stopping the rotation of the motor without changing the direction of the current flowing through the motor windings.

[0062] As described above, the first holder drive unit 45 of this embodiment includes a drive source gear 113 that rotates based on the drive of the servo motor 104, and a squeegee gear 117 that has teeth 117B to which power is transmitted from the drive source gear 113, and rotates in conjunction with the rotation of the drive source gear 113 to rotate the first squeegee holder 42 around the tip 43A of the first squeegee member 43. The teeth 117B of the squeegee gear 117 are formed with a plurality of teeth arranged along a predetermined circumference 125A, and the center of the circle of the circumference 125A where the plurality of teeth of the teeth 117B are arranged is the position of the tip 43A of the first squeegee member 43 (see Figure 6). With this, by rotating the drive source gear 113 and rotating the squeegee gear 117 along the circumference 125A, the first squeegee member 43 can be rotated in the circumferential direction of the circumference 125A around the tip 43A. The load applied to the tip 43A of the first squeegee member 43 is less likely to be transmitted to the servo motor 104 via the first squeegee member 43.

[0063] Furthermore, the first squeegee unit 40 includes a first squeegee holder support plate 41 that holds the first squeegee holder 42. The rotary guide 118 has a sliding portion 118D formed along a predetermined circumference 125B. When attached to the first squeegee holder support plate 41, the rotary guide 118 supports the squeegee gear 117 from below with the sliding portion 118D and holds the squeegee gear 117 so that it can slide along the predetermined circumference 125B. The center of the circle of the circumference 125B, which is aligned with the shape of the rack portion 117A of the squeegee gear 117, is at the position of the tip 43A of the first squeegee member 43. With this configuration, the rotary guide 118 supports the squeegee gear 117 from below while being held by the first squeegee holder support plate 41, and can rotate the first squeegee member 43 in the circumferential direction of the circumference 125B with the tip 43A as the center. The squeegee gear 117 can be slid in the circumferential direction with high precision.

[0064] Incidentally, the correspondence between the terms used in the first embodiment and the terms used in the claims will be explained below. The first squeegee holder support plate 41 in the first embodiment is an example of a squeegee holder support. The first squeegee holder 42 is an example of a squeegee holder. The first and second squeegee members 43 and 53 are examples of squeegee members. The servo motors 104 and 124 are examples of drive sources. The first holder drive unit 45 and the second holder drive unit 55 are examples of holder drive units. The gear diameter R3 is an example of the distance from the rotation center 113E of the drive source gear 113 to the teeth 113C of the drive source gear 113.

[0065] As described above, the first embodiment provides the following effects. In one aspect of this embodiment, the control device 90 controls the servo motor 104 to rotate the first squeegee member 43 around the tip 43A and performs an angle change process to change the rotation angle θ of the first squeegee member 43. After performing the angle change process, the control device 90 reduces the power transmitted from the servo motor 104 to the first squeegee holder 42 and performs a printing process to slide the first squeegee member 43 on the screen mask M and print solder S.

[0066] According to this, even if the tip 43A of the first squeegee member 43 comes into contact with the solder S or screen mask M during the printing process and a load is applied, the load applied to the tip 43A is less likely to be transmitted to the servo motor 104 via the first squeegee member 43. The same applies to the second squeegee member 53. Therefore, the load applied to the servo motor 104 during the printing process can be reduced. The power applied from the servo motor 104 to the first squeegee holder 42, which is necessary to maintain the first squeegee member 43 at a predetermined rotation angle θ during the printing process, can be reduced. Printing can be performed with reduced power applied from the servo motor 104 to the first squeegee holder 42, thereby reducing power consumption during the printing process. In addition, the load on the servo motor 104 is reduced, and the progression of deterioration of the servo motor 104 can be suppressed. As a result, the lifespan of the servo motor 104 can be extended.

[0067] (Second Embodiment) Next, a second embodiment that embodies the contents of this disclosure will be described. Figure 9 shows the first squeegee unit 140 of the second embodiment. In the following description, components similar to those in the first embodiment described above will be denoted by the same reference numerals, and their descriptions will be omitted as appropriate. The first squeegee unit 40 of the first embodiment described above was configured to have one servo motor 104 as a drive source for rotating the first squeegee member 43. In contrast, the first squeegee unit 140 of the second embodiment differs from the first squeegee unit 40 of the first embodiment in that it is equipped with two servo motors 104 and 204 (drive sources).

[0068] As shown in Figure 9, the first holder drive unit 245 of the first squeegee unit 140 has a first drive unit 201 at the front end of the first squeegee holder support plate 41 and a second drive unit 202 at the rear end. The first drive unit 201, like the first drive unit 101 of the first embodiment, includes a servo motor 104, a drive source gear 113, intermediate gears 114 and 115, and a squeegee gear 117.

[0069] Furthermore, the second drive unit 202, like the first drive unit 201, includes a servo motor 204, a main body 211, a drive source gear 213, intermediate gears 214 and 215, and a squeegee gear 217. Therefore, the first holder drive unit 245 of the second embodiment includes a servo motor 204 in addition to the servo motor 104 of the first drive unit 201, as well as a servo motor 204 in the second drive unit 202. In other words, both drive units are equipped with a drive source.

[0070] Furthermore, the first squeegee unit 40 of the first embodiment is equipped with a connecting shaft 103 that interlocks the first and second drive units 101 and 102. However, the first squeegee unit 140 of the second embodiment is not equipped with a connecting shaft 103, and the first and second drive units 201 and 202 can operate independently of each other. The servo motor 204 is mounted on the front of the main body 211, and the drive source gear 213 and intermediate gears 214 and 215 are mounted on the rear of the main body 211. Note that Figure 9 omits the illustration of the cover member 119 of the first drive unit 201 and the cover member of the second drive unit 202.

[0071] The squeegee gear 217 and the intermediate gear 215 have the same configuration as in the first embodiment, except that the intermediate gear 215 is not connected to the intermediate gear 115. Also, the drive source gear 213 rotates in response to the drive of the servo motor 204. The squeegee gear 217 receives rotational driving force from the drive source gear 213 via the intermediate gears 214 and 215 and slides along the circumference 125B (see Figure 6).

[0072] The control device 90 synchronizes the operation of the servo motor 104 provided in the first drive unit 201 and the servo motor 204 provided in the second drive unit 202, thereby linking the first drive unit 201 and the second drive unit 202. The second drive unit 202 is provided with an encoder 205 that outputs encoder information corresponding to the rotation position of the servo motor 204. Based on the encoder information from the encoder 105 of the first drive unit 201 and the encoder information from the encoder 205 of the second drive unit 202, the control device 90 synchronizes the rotation of the two servo motors 104 and 204. The drive source gears 113 and 213 rotate at the same rotation angle and in the same rotation direction. This allows the ends of the holder holding portion 47 to rotate synchronously in the front-rear direction, and the rotation angle θ of the first squeegee member 43 to be changed. The first squeegee member 43 can be rotated around its tip 43A while maintaining a state in which the plane of the first squeegee member 43 is parallel to the front-rear direction. In other words, similar to the first embodiment, the rotation angle θ of the first squeegee member 43 can be changed. Furthermore, by making the tip 43A the center of rotation, it is possible to suppress the transmission of the load applied to the first squeegee member 43 from solder S, etc., to the servo motors 104 and 204. For this reason, the control device 90 performs printing with the drives of the two servo motors 104 and 204 turned off during the printing process. This reduces power consumption during the printing process and extends the lifespan of the servo motors 104 and 204.

[0073] In the above explanation, a configuration was described in which the first squeegee unit 140 is provided with two drive sources. However, the second squeegee unit 50 may also be configured to have two servo motors, similar to the first squeegee unit 140. Furthermore, the two drive sources are not limited to servo motors; they may be other types of motors such as stepping motors, or even non-motor drive sources such as hydraulic cylinders.

[0074] Incidentally, the correspondence between the terms used in the second embodiment and the terms used in the claims will be explained below. The servo motors 104 and 204 in the second embodiment are examples of drive sources. The first holder drive unit 245 is an example of a holder drive unit.

[0075] As described above, the second embodiment provides the same effects as the first embodiment. Furthermore, the second embodiment provides the following effects. The control device 90 of the second embodiment operates two servo motors 104 and 204 in synchronization to link the first and second drive units 201 and 202. In this configuration, the first holder drive unit 245 is equipped with a drive source for each of the first drive unit 201 and the second drive unit 202, and the first and second drive units 201 and 202 are linked by operating the two drive sources (servo motors 104 and 204) in synchronization. By providing drive sources at both ends in the front-rear direction, the rotational driving force at both ends can be made more uniform for rotation. The rotation angles θ at both ends can be more reliably matched.

[0076] It goes without saying that this disclosure is not limited to the embodiments described above, and various improvements and modifications are possible without departing from the spirit of this disclosure. For example, in the embodiments described above, servo motors 104, 124, and 204 were used as the drive source of this disclosure, but this is not limited to them. For example, a fluid pressure cylinder such as an air cylinder or a hydraulic cylinder may be used as the drive source, and the squeegee gear 117, etc. may be driven by the fluid pressure cylinder. Also, the screen printing machine 10 may be configured to have only one squeegee member or squeegee unit, or it may be configured to have three or more. Accordingly, the screen printing machine 10 may be configured to have a first squeegee unit 40 but not a second squeegee unit 50. Also, in the first embodiment, the first drive unit 101 and the second drive unit 102 do not have to be provided at the end of the first squeegee holder support plate 41. For example, the first drive unit 101 may be provided at a position a predetermined distance rearward from the front end of the first squeegee holder support plate 41. Furthermore, in the first embodiment, the servo motor 104, drive source gear 113, and intermediate gear 114 may be provided in the second drive unit 102. Also, in each of the above embodiments, the control device 90 performs an angle change process to automatically change the rotation angle θ of the first squeegee member 43 to the rotation angle θ received by the touch panel 85, but it is not limited to this. For example, the control device 90 may perform an angle change process to rotate the first squeegee member 43 by driving the servo motor 104 while a predetermined button displayed on the touch panel 85 is touched. This allows the user to change the rotation angle θ of the first squeegee member 43 to a desired angle by operating the touch panel 85 and confirming the value of the scale 131 indicated by the scale indicator mark 121A. Therefore, the angle change process may also be a process that gradually changes the rotation angle θ in response to the user's operation.

[0077] Furthermore, the contents of this disclosure are not limited to the dependencies described in the claims. For example, this specification also discloses a technical concept in which "the screen printing machine described in claim 3" is changed to "the screen printing machine described in claim 3 or claim 4" in claim 5. Also, for example, this specification also discloses a technical concept in which "the screen printing machine described in claim 1 or claim 2" is changed to "the screen printing machine described in any one of claims 1 to 5" in claim 6. Also, for example, this specification also discloses a technical concept in which "the screen printing machine described in claim 6" is changed to "the screen printing machine described in claim 6 or claim 7" in claim 8. Also, for example, this specification also discloses a technical concept in which "the screen printing machine described in claim 6" is changed to "the screen printing machine described in any one of claims 6 to 8" in claim 9.

[0078] 10 Screen printing machine, 41 First squeegee holder support plate (squeegee holder support part), 42 First squeegee holder (squeegee holder), 43 First squeegee member (squeegee member), 43A Tip, 45, 245 First holder drive unit (holder drive unit), 47 Holder holding part, 53 Second squeegee member (squeegee member), 55 Second holder drive unit (holder drive unit), 90 Control device, 101, 201 First drive unit, 102, 202 Second drive unit, 103 Connecting shaft, 104, 204, 124 Servo motor (drive source), 111, 211 Main body, 113, 213 Drive source gear, 113C Teeth, 113E Rotation center, 117, 217 Squeegee gear, 117B Teeth, 118, 218 Rotation guide, 118D Slide part, 119 Cover member, 121 Gear cover, 121A Scale indicator mark, 125A, 125B Circumference, 131 Scale, R1 Radius, R3 Gear diameter (distance), S Solder (viscous fluid), M Screen mask, θ Rotation angle.

Claims

1. A screen printing machine comprising: a squeegee member; a squeegee holder for holding the squeegee member; a holder drive unit for driving the squeegee holder so as to rotate around the tip of the squeegee member based on the drive of a drive source; and a control device for controlling the drive source, wherein the control device controls the drive source to rotate the squeegee member around its tip and performs an angle change process to change the rotation angle of the squeegee member; and after performing the angle change process, performs a printing process to slide the squeegee member on a screen mask and print a viscous fluid while reducing the power transmitted from the drive source to the squeegee holder.

2. The screen printing machine according to claim 1, wherein the drive source is a motor, and the control device reduces the power transmitted from the motor to the squeegee holder by turning off the drive of the motor during the printing process.

3. The screen printing machine according to claim 1 or 2, wherein the holder drive unit comprises a first drive unit provided at a position that is one end of the squeegee member in the longitudinal direction, and a second drive unit provided at a position that is the other end of the squeegee member in the longitudinal direction, and the control device controls the drive source in the angle change process and links the first drive unit and the second drive unit to change the rotation angle of the squeegee member.

4. The screen printing machine according to claim 3, wherein the holder drive unit further comprises a connecting shaft that connects the first drive unit and the second drive unit, the drive source is provided in the first drive unit, and the holder drive unit transmits the power of the drive source provided in the first drive unit to the second drive unit via the connecting shaft, thereby linking the first drive unit and the second drive unit.

5. The screen printing machine according to claim 3, wherein the drive source is provided in the first drive unit and the second drive unit, and the control device operates the drive source provided in the first drive unit and the drive source provided in the second drive unit in a synchronized manner, thereby linking the first drive unit and the second drive unit.

6. The screen printing machine according to claim 1 or 2, wherein the holder drive unit comprises a drive source gear that rotates based on the drive of the drive source, and a squeegee gear having teeth that receive power from the drive source gear, and which rotates in conjunction with the rotation of the drive source gear to rotate the squeegee holder around the tip of the squeegee member, wherein the teeth of the squeegee gear are formed with a plurality of teeth arranged along a predetermined circumference, and the center of the circle of the circumference on which the plurality of teeth of the teeth are arranged is the position of the tip of the squeegee member.

7. The screen printing machine according to claim 6, further comprising a squeegee holder support for holding the squeegee holder, wherein the holder drive unit comprises a main body attached to the squeegee holder support and holding the drive source gear, and a rotating guide attached to the squeegee holder support, wherein the rotating guide has a sliding portion formed along a predetermined circumference, and when attached to the squeegee holder support, the sliding portion supports the squeegee gear from below and holds the squeegee gear so that it can slide along the predetermined circumference, and the center of the circle of the circumference along the shape of the squeegee gear is the position of the tip of the squeegee member.

8. The screen printing machine according to claim 6, wherein the holder drive unit is provided at one end of the squeegee member in the longitudinal direction and has a cover member provided with a scale indicating the rotation angle of the squeegee member, and a gear cover that rotates in conjunction with the rotation of the drive source gear and has a scale indicator mark that points to the scale provided on the cover member, and the cover member covers the drive source gear from the outside in the longitudinal direction of the squeegee member.

9. The screen printing machine according to claim 6, wherein the radius of the circle on which the multiple teeth of the squeegee gear are aligned is longer than the distance from the rotation center of the drive source gear to the teeth of the drive source gear.

Images