Screen printing machine

Abstract

A screen printing machine is provided which is capable of cleaning a squeegee holding member holding a squeegee member separately from a driving member which changes the angle of the squeegee member. The screen printing machine of the present disclosure is provided with a holding member support, a holding member driving member installed to the holding member support, and a squeegee holding member holding the squeegee member, which is installed to the holding member support in a detachable manner by a first fixing member, is linked to the holding member driving member in a state of being installed to the holding member support by the first fixing member, and rotates based on the driving of the holding member driving member.

Description

Technical Field

[0001] This disclosure relates to the cleaning of the squeegee components of a screen printing machine. Background Technology

[0002] Previously, various techniques for changing the angle of the squeegee component of a screen printing machine have been proposed. For example, Patent Document 1 describes a screen printing machine that changes the angle of a plate (equivalent to the squeegee component of this disclosure) by raising and lowering two lifting shafts. The screen printing machine of Patent Document 1 has two drive units, and a swinging member is mounted at the lower end of the lifting shaft of each of the two drive units. The swinging member is equipped with a plate and rotates according to the vertical position of the two lifting shafts, thereby changing the angle of the plate.

[0003] Existing technical documents

[0004] Patent Document 1: International Publication No. 2019 / 208213 Summary of the Invention

[0005] The problem that the invention aims to solve

[0006] In a screen printing machine, a viscous fluid coated on a screen mask is printed onto a substrate or similar object through patterned holes in the mask by sliding a plate across the mask. During the printing process, the viscous fluid adheres to the plate. In screen printing machines like the one described in Patent Document 1, which have a drive unit that can change the angle of the plate, the plate with the adhered viscous fluid needs to be cleaned after the printing process. Furthermore, during cleaning, care must be taken to prevent cleaning solutions such as alcohol from adhering to the drive unit. Therefore, a technology is required that allows the plate to be cleaned without the cleaning solution adhering to the drive unit.

[0007] The present invention was made in view of the above-mentioned problems, and its object is to provide a screen printing machine that can separate the squeegee holder of the squeegee component from the drive part that changes the angle of the squeegee component for cleaning.

[0008] Methods for solving problems

[0009] This specification discloses a screen printing machine comprising: a retainer support; a retainer drive unit mounted on the retainer support; and a squeegee retainer that retains a squeegee component and is detachably mounted on the retainer support via a first fixing member, and is connected to the retainer drive unit when mounted on the retainer support via the first fixing member, and rotates based on the drive of the retainer drive unit.

[0010] Invention Effects

[0011] According to the screen printing machine of the present invention, the squeegee holder that holds the squeegee component can be separated from the drive part that changes the angle of the squeegee component for cleaning. Attached Figure Description

[0012] Figure 1 This is a schematic structural diagram of the screen printing machine 10 according to the first embodiment.

[0013] Figure 2 This is a perspective view of the first scraper unit 40 in the first embodiment.

[0014] Figure 3 This is an exploded perspective view of the first scraper unit 40 of the first embodiment.

[0015] Figure 4 This is an exploded perspective view of the first scraper unit 40 of the first embodiment.

[0016] Figure 5 This is an exploded perspective view of the first scraper unit 40 of the first embodiment with the rotating guide 118 removed.

[0017] Figure 6 This is a perspective view of the first scraper unit 40 in the first embodiment.

[0018] Figure 7 This is a diagram showing the first scraper unit 140 of the second embodiment viewed from one side in the left-right direction. Detailed Implementation

[0019] (First Implementation)

[0020] Hereinafter, a first embodiment of the screen printing machine of the present disclosure will be described with reference to the accompanying drawings. Figure 1 This is a schematic structural diagram of the screen printing machine 10 according to the first embodiment. Additionally, Figure 1 The left and right directions indicate the printing direction. Figure 1 The front-back direction indicates the substrate transport direction.

[0021] The screen printing machine 10 of the first embodiment is an apparatus in which solder S on a screen mask M is rolled by a squeegee (first squeegee member 43 or second squeegee member 53), thereby pressing the solder S into the pattern holes H formed in the screen mask M, and printing it onto the substrate P under the screen mask M. Figure 1As shown, the screen printing machine 10 includes: a housing 11, a substrate transport device 21, a support device 25, a screen mask stage 12, a printing head 30, and a control device 90. Furthermore, the viscous fluid applied by the screen printing machine 10 is not limited to solder S, but can also be other viscous fluids such as adhesives or conductive solder pastes. Therefore, the screen printing machine of this disclosure is not limited to an apparatus for printing solder S onto a substrate P using a screen mask M; it can also be an apparatus for printing other viscous fluids such as adhesives or conductive solder pastes onto a printing object using a screen mask M. Furthermore, the printing object is not limited to the substrate P.

[0022] like Figure 1 As shown, the substrate transport device 21 is located in the lower section of the housing 11. The substrate transport device 21 has a... Figure 1 The substrate P is transported along the channel 22 extending from the front to the inside by a belt conveyor. A support device 25 is provided in the lower section of the housing 11. The support device 25 includes: a support table 26 that can move up and down by a lifting device (not shown); and multiple support pins 27 provided on the support table 26 to support the substrate P from the back.

[0023] The screen mask stage 12 is located in the middle section of the housing 11 and supports the screen mask M in a horizontal position. The printing head 30 is located in the upper section of the housing 11. The printing head 30 includes: a head body 31, a first squeegee unit 40, a second squeegee unit 50, and a head moving device 80 for moving the head body 31 in the horizontal direction, i.e., the printing direction.

[0024] The head body 31 has a first scraper lifting device 60 for raising and lowering the first scraper unit 40 and a second scraper lifting device 70 for raising and lowering the second scraper unit 50. The first scraper 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 vertically extending ball screw shaft, which is held in the head body 31 in a rotatable and vertically movable manner. The ball screw nut 62 is screwed onto the ball screw shaft of the first lifting shaft 61 and is rotatably held in the head body 31. The motor 63 is fixed to the head body 31 and drives the ball screw nut 62 to rotate in both forward and reverse directions. The first scraper lifting device 60 drives the ball screw nut 62 to rotate forward by driving the motor 63, thereby lowering the first lifting shaft 61; and drives the ball screw nut 62 to rotate in reverse by driving the motor 63, thereby raising the first lifting shaft 61.

[0025] The second scraper lifting device 70 includes a second lifting shaft 71, a ball screw nut 72, and a motor 73. The second scraper lifting device 70 has the same structure as the first scraper lifting device 60. Therefore, a detailed description of the second scraper lifting device 70 is omitted. The second scraper lifting device 70 raises and lowers the second lifting shaft 71 by driving the motor 73.

[0026] The head moving device 80 includes a moving shaft 81 as a ball screw shaft, a ball screw nut 82, and a motor 83. The moving shaft 81 includes a ball screw shaft extending in the horizontal direction, i.e., the printing direction, and is fixed to the upper part of the housing 11. The ball screw nut 82 is screwed to the moving shaft 81 and is rotatably held in the head body 31. The motor 83 is fixed to the head body 31 and drives the ball screw nut 82 to rotate in both forward and reverse directions. The head moving device 80 drives the ball screw nut 82 to rotate forward by driving the motor 83, thereby moving the head body 31 to one side in the printing direction; and drives the ball screw nut 82 to rotate in reverse by driving the motor 83, thereby moving the head body 31 to the other side in the printing direction.

[0027] The first scraper unit 40 is detachably installed on the first lifting shaft 61 and moves up and down together with the first lifting shaft 61. Figure 2 This is a perspective view of the first scraper unit 40. Figures 3 to 5 This is an exploded perspective view of the first scraper unit 40. (See image below.) Figures 2 to 5 As shown, the first scraper unit 40 includes: a retainer support 41, a scraper retainer 42, a first scraper component 43, and a first retainer drive 45. Additionally, Figure 5 This indicates the state in which some components, such as the cover component 119 and the gear cover 121 described later, have been removed. Furthermore, in the following description, the orientation is based on the state in which the first squeegee unit 40 is installed on the screen printing machine 10.

[0028] The retaining member support portion 41 has a predetermined thickness in the vertical direction and is generally plate-shaped with a longer front-to-back direction. The retaining member support portion 41 is mounted on the first lifting shaft 61 and moves up and down together with it. For example, two mounting members 46 are mounted on the upper surface 41A of the retaining member support portion 41. The two mounting members 46 are respectively mounted at both ends of the retaining member support portion 41 in the front-to-back direction. The retaining member support portion 41 engages the two mounting members 46 with engaging grooves (not shown) provided on the first lifting shaft 61, thereby mounting them to the first lifting shaft 61.

[0029] A retainer retainer 47 is disposed below the retainer support 41. The retainer retainer 47 has, for example, a predetermined thickness in the vertical direction, and its width in the horizontal direction is approximately constant, resulting in a plate-like shape that is longer in the front-back direction. The retainer retainer 47 is held so as to be rotatable relative to the retainer support 41, and rotates based on the drive of the first retainer drive 45. The retainer retainer 47 rotates about a rotation axis parallel to the front-back direction.

[0030] The scraper retainer 42 is fixed relative to the retainer retainer portion 47, for example, by four first threaded components 48. The first threaded components 48 are, for example, bolts. The scraper retainer 42 has a retainer body portion 42A and a clamping portion 42B. The retainer body portion 42A is a rod-shaped metal component that is relatively long in the front-rear direction and has a generally hexagonal cross-section. A plurality of threaded portions 42D with openings on the upper surface 42C are formed in the retainer body portion 42A. Internal threads are formed within the threaded portions 42D. For example, four threaded portions 42D are formed in the retainer body portion 42A. The four threaded portions 42D are formed at equal intervals in the front-rear direction.

[0031] Four first engagement members 48 are mounted on the retaining part 47. For example, in the retaining part 47, a plurality of insertion holes 47A for inserting the first engagement members 48 are formed at predetermined intervals in the front-rear direction (see reference). Figure 3 Insertion holes 47A are formed by penetrating the plate-shaped retainer holding portion 47 in the vertical direction. Four insertion holes 47A are formed, each aligned with one of the four threaded portions 42D. For example, the insertion holes 47A are formed directly above the threaded portions 42D. First threaded members 48 are inserted from above into each of the four insertion holes 47A. The lower portion of the first threaded member 48 protrudes downward from the insertion hole 47A. In each of the four first threaded members 48, the portion protruding from the insertion hole 47A is threaded into the threaded portion 42D. Thus, the retainer body portion 42A is fixed to the retainer holding portion 47.

[0032] Four access holes 41B are formed in the retainer support portion 41. Each of the four access holes 41B extends through the retainer support portion 41 in the vertical direction and has an opening on its upper surface 41A. The four access holes 41B are aligned with the positions of the four insertion holes 47A. For example, the access holes 41B are formed directly above the insertion holes 47A. Therefore, the access holes 41B, the first engagement member 48, the insertion holes 47A, and the engaged portion 42D are arranged in a straight line parallel to the vertical direction. Furthermore, the head of the first engagement member 48 can be accessed through the access holes 41B. Figure 3As shown, the access hole 41B is formed with an inner diameter that allows insertion of a tool 91 that rotates the first engagement member 48. For example, if the first engagement member 48 is an internal hex bolt, a hex wrench can be used as the tool 91. In this case, the insertion hole 47A is formed, for example, with an inner diameter slightly larger than that of a hex wrench.

[0033] Therefore, even with the retainer holding part 47 installed on the retainer support part 41, the first threaded member 48 inserted into the retainer holding part 47 can be accessed from above the retainer support part 41. The user can rotate the first threaded member 48 using a tool 91 inserted through the access hole 41B, causing the first threaded member 48 to engage with the threaded part 42D. Thus, the scraper retainer 42 can be attached to and detached from the retainer holding part 47 without removing it from the retainer support part 41.

[0034] The first threaded component 48 is an example of the first fixing component of the present invention. Furthermore, the first threaded component 48 is not limited to a bolt, but may also be other threadable components such as screws. The same applies to the other threaded components 42E, 35, and 39 described later. Additionally, the method of fixing the scraper holder 42 relative to the holder holding portion 47, i.e., the method of fixing using the first fixing component, is not limited to using threaded components such as bolts. For example, the first fixing component of this disclosure may also be a clamping component that clamps and fixes the scraper holder 42 and the holder holding portion 47. In this case, the user can adjust the clamping force by loosening the bolt of the clamping component, for example, to detach and attach the scraper holder 42 relative to the holder holding portion 47. Alternatively, the first fixing component of this disclosure may also be a strap or cable tie that is wound around and fixes the scraper holder 42 relative to the holder holding portion 47.

[0035] In addition, a plurality of locating pins 49 are provided in the retaining part 47 (see reference). Figure 4 Four locating pins 49 are provided, for example. The locating pins 49 are, for example, cylindrical in shape and protrude downwards from the lower surface of the retaining portion 47. The axial length of the locating pins 49 is, for example, shorter than the length of the first threaded member 48 protruding from the insertion hole 47A. Four locating holes 42F are formed on the scraper retainer 42, aligned with the positions of the locating pins 49. Each of the four locating holes 42F is a cylindrical hole with an opening on the upper surface 42C, formed with an inner diameter slightly larger than that of the locating pins 49, allowing the locating pins 49 to be inserted.

[0036] The position of the scraper retainer 42 relative to the retainer retaining portion 47 is determined by inserting the locating pin 49 into each of the four locating holes 42F. In this state, the first threaded member 48 is positioned directly above the threaded portion 42D. That is, the scraper retainer 42 is positioned correctly relative to the retainer retaining portion 47. Thus, the user can easily align the position of the first threaded member 48 with the position of the threaded portion 42D by inserting the locating pin 49 into the locating hole 42F.

[0037] Furthermore, the lengths of the first squeegee component 43 and the squeegee holder 42 in the front-to-back direction vary depending on the size of the substrate P and the screen mask M to be printed. Therefore, the positions of the first threaded component 48 and the positioning pin 49 are preferably, for example, positions that correspond to all squeegee holders 42 that can be mounted on the holder support 41, from the longest to the shortest. Alternatively, it is preferable that at least one of the plurality of first threaded components 48 is located in a position where all squeegee holders 42 can be mounted. The same applies to the positioning pin 49. Thus, for all the first squeegee components 43 and squeegee holders 42 that can be mounted, positioning based on the positioning pin 49 and fixing based on the first threaded component 48 can be implemented.

[0038] Furthermore, the first scraper component 43 is held by the scraper retainer 42. Therefore, while the first scraper component 43 is fixed to the retainer retainer 47 via the scraper retainer 42, it rotates integrally with the retainer retainer 47. The scraper retainer 42 and the first scraper component 43 are capable of rotating relative to the retainer support 41 about a rotation axis parallel to the front-rear direction.

[0039] The first squeegee component 43 is formed, for example, of an elastic material such as polyurethane. Furthermore, the material of the first squeegee component 43 is not particularly limited and may also be a metal. The first squeegee component 43 is, for example, a rectangular plate that is longer and thinner in one direction. When mounted on the screen printing machine 10, the first squeegee component 43 has a rectangular shape that is thinner in the left-right direction, has a predetermined width in the up-down direction, and is longer in the front-back direction. Therefore, the front-back direction is an example of the longitudinal direction of the squeegee component of this disclosure.

[0040] The scraper retainer 42 is held, for example, in a state that clamps the upper end of the first scraper member 43. The clamping portion 42B is a thin, plate-shaped metal component, thinner in the left-right direction, having a predetermined width in the up-down direction, and longer in the front-back direction. The clamping portion 42B can be detached from the retainer body 42A and is fixed to the retainer body 42A using multiple threaded components 42E. In this embodiment, eight threaded components 42E are arranged at equal intervals in the front-back direction. Figures 2 to 5In the example shown, the retainer body 42A and the clamping part 42B have approximately the same length as the first scraper member 43 in the front-rear direction. With the clamping part 42B positioned on the right side of the retainer body 42A, it is fixed relative to the retainer body 42A by screwing in eight screwing parts 42E inserted from the left side. The scraper retainer 42 holds the first scraper member 43 by screwing in the screwing parts 42E between the retainer body 42A and the clamping part 42B, clamping the upper end of the first scraper member 43. The first scraper member 43 is installed, for example, at a predetermined angle relative to the scraper retainer 42. Furthermore, the method of fixing the first scraper member 43 relative to the scraper retainer 42 is the same as the method of fixing the scraper retainer 42 relative to the retainer retainer 47 described above; it can also be done using clamping parts or belts. Alternatively, the first scraper member 43 can be fixed to the scraper retainer 42 by welding or the like. That is, the first scraper component 43 may also be a structure that cannot be removed from the scraper retainer 42 for replacement.

[0041] The first scraper unit 40 includes a pair of solder paste guides 106A and 106B. Solder paste guide 106A is disposed at the front end of the first scraper unit 40, and solder paste guide 106B is disposed at the rear end. Solder paste guide 106B has the same structure as solder paste guide 106A, and is configured to reverse the components of solder paste guide 106A in the front-rear direction. Therefore, in the following description, the solder paste guide 106A will be mainly described, and the description of solder paste guide 106B will be appropriately omitted.

[0042] A pair of solder paste guides 106A and 106B are components used to suppress solder S from overflowing outwards from both ends of the first squeegee component 43 in the front-to-back direction during the printing process. In other words, the pair of solder paste guides 106A and 106B are components to suppress the flow of viscous fluid in a direction deviating from the printing direction, which is the direction in which the first squeegee component 43 moves relative to the viscous fluid applied by the first squeegee component 43.

[0043] The solder paste guide 106A has a bracket 107 and a guide portion 108. The bracket 107 is detachably mounted to the retainer support portion 41. A track 33 is mounted on the left side of the retainer support portion 41. The track 33 is fixed to the retainer support portion 41, for example, by three threaded members 35. Three protrusions 41C that threaded members 35 are formed on the left side of the retainer support portion 41, and two recesses 41D are formed in the front-rear direction at positions that clamp the three protrusions 41C. The track 33 is fixed to the retainer support portion 41 by the threaded members 35 that threaded members 41C into the middle in the left-right direction. Therefore, in the left-right direction, gaps are formed between the track 33 and the retainer support portion 41 through the two recesses 41D. Sliding members 37 are inserted into the two recesses 41D.

[0044] like Figure 3 As shown, a slit 33A is formed in the track 33 along a direction parallel to the front-back direction. A protrusion 37A and two screwed portions 37B are formed in the sliding member 37. The sliding member 37 is installed with the protrusion 37A inserted into the slit 33A from the rear of the track 33, and is configured to slide in the front-back direction. The two screwed portions 37B are exposed from the slit 33A.

[0045] like Figures 2 to 5 As shown, the bracket 107 is a plate-shaped metal component mounted on the retainer support 41 with its plane parallel to the front-back and vertical directions. The bracket 107 has a base 107A extending in the vertical direction and a mounting portion 107B extending outward in the front-back direction from the lower end of the base 107A. Viewed from one side in the front-back direction, the bracket 107 is bent at approximately 90 degrees. A through hole 107C for inserting a protrusion 37A and two through holes for inserting a second threaded member 38 are formed at the upper end of the base 107A. The protrusion 37A and the two through holes are arranged in the front-back direction. The protrusion 37A is inserted into the through hole 107C from the right side. Thus, the positions of the two through holes of the base 107A can be easily aligned with the threaded portion 37B of the sliding member 37. The second threaded component 38 is inserted into the two through holes of the base 107A from the left side. The inserted second threaded component 38 is threaded into the threaded part 37B, thereby fixing the bracket 107 relative to the sliding component 37.

[0046] With the second threaded member 38 released, the solder paste guide 106A can slide forward and backward together with the sliding member 37. Alternatively, by tightening the second threaded member 38, the base 107A and the sliding member 37 can clamp the track 33, fixing the position of the solder paste guide 106A relative to the track 33. Thus, after adjusting the position of the guide 108 in the forward and backward direction by loosening the second threaded member 38, the position of the guide 108 can be fixed by tightening the second threaded member 38.

[0047] The second threaded component 38 is an example of the second fixing component of this disclosure, such as a bolt. However, the second threaded component 38 is not limited to a bolt; it can also be other threadable components such as screws. Furthermore, the method of fixing the solder paste guides 106A and 106B relative to the track 33, i.e., the method of fixing using the second fixing component, is the same as the first fixing component, and can also be a method using a clamping component or a strap, etc.

[0048] The guide portion 108 is fixed to the front end of the mounting portion 107B by two screw-fit members 39. If it is a solder paste guide 106A, the guide portion 108 is fixed to the front end of the mounting portion 107B. The guide portion 108 protrudes to the right from the mounting portion 107B and is positioned facing the first squeegee member 43 in the left-right direction. Therefore, the guide portions 108 of each of the pair of solder paste guides 106A and 106B sandwich the first squeegee member 43 in the front-back direction, respectively positioned on the outer side of the first squeegee member 43. The position of the lower surface of the guide portion 108 is approximately the same as the position of the front end 43A of the first squeegee member 43 in the vertical direction. Thus, the guide portion 108 can be used to block the solder S, which is extended by the first squeegee member 43 in the left-right direction (i.e., the printing direction), from expanding in the front-back direction orthogonal to the printing direction. Solder S leakage can be suppressed.

[0049] like Figure 5 and Figure 6 As shown, the first retainer drive unit 45 includes: a first drive unit 101, a second drive unit 102, a connecting shaft 103, and a servo motor 104. The first drive unit 101 is mounted on the front end 41E of the retainer support unit 41 in the front-rear direction. The first drive unit 101 includes: a main body 111, a drive source gear 113, intermediate gears 114 and 115, a scraper gear 117, a rotation guide 118, and a cover member 119 (see reference). Figure 2 ) and gear cover 121 (refer to) Figure 2 The servo motor 104 is mounted on the rear surface of the main body 111 fixed to the front end 41E, and is connected to the control device 90 (see reference 105) via cable 105. Figure 1The drive source gear 113 is mounted on the upper part of the front surface 111A of the main body 111 and fixed to the output shaft 104A of the servo motor 104.

[0050] The drive source gear 113 has: an annular portion 113A, a plate-shaped portion 113B protruding downward from the annular portion 113A, and teeth 113C formed at the front end of the plate-shaped portion 113B. The annular portion 113A is annular in shape and is fixed to a pulley mounted on the output shaft 104A of the servo motor 104 by a plurality of threaded components 113D. The drive source gear 113 is mounted with the teeth 113C meshing with the intermediate gear 114.

[0051] Intermediate gear 114 is mounted on the front surface 111A and rotatably mounted on the main body 111. The connecting shaft 103 is a cylindrical shape that is longer in the front-rear direction and is arranged with its axial direction parallel to the front-rear direction. It is held rotatably by the retainer support 41. The front end of the connecting shaft 103 protrudes forward from the front end 41E of the retainer support 41. Intermediate gear 115 is mounted on the portion of the connecting shaft 103 that protrudes forward from the front end 41E and rotates together with the connecting shaft 103. Intermediate gear 114 is positioned vertically between the teeth 113C of the drive source gear 113 and the intermediate gear 115, meshing with both the teeth 113C and the intermediate gear 115. Intermediate gear 115 is positioned below the intermediate gear 115.

[0052] The scraper gear 117 has a rack portion 117A and a tooth portion 117B. The rack portion 117A is a plate-shaped component with a predetermined thickness in the vertical direction, and has an arc shape that curves upward with a predetermined curvature. The tooth portion 117B is formed on the upper surface of the rack portion 117A and at the front end portion of the rack portion 117A. For example, when viewed from the front-rear direction, the upper end of the rack portion 117A and the tooth portion 117B are formed along a circumference with a predetermined radius centered on the front end 43A of the first scraper member 43 mounted on the scraper holder 42. The tooth portion 117B is disposed below the intermediate gear 115 and meshes with the intermediate gear 115.

[0053] The scraper gear 117 has its rear end fixed to the front end 47B of the retainer holding portion 47, protruding forward from the front end 47B. A rotary guide 118 is mounted on the front surface of the front end 41E, holding the scraper gear 117 relative to the retainer support portion 41. Therefore, the front end 47B of the retainer holding portion 47 is held by the retainer support portion 41 via the scraper gear 117 and the rotary guide 118. With the rotary guide 118 covering the front surface of the scraper gear 117, for example, two bolts 123 are inserted from the front, and the two bolts 123 engage with the front end 41E, thereby fixing it relative to the retainer support portion 41.

[0054] The rotation guide 118 has a receiving portion 118A for receiving an intermediate gear 115. A through hole 118B is formed at the rear end of the receiving portion 118A 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 41E and is held rotatably by the retainer support 41 while inserted into the through hole 118B. The intermediate gear 115 is mounted on the front end of the connecting shaft 103 protruding forward from the through hole 118B. The intermediate gear 115 is configured with a gap between itself and the inner circumferential surface of the receiving portion 118A and is rotatably housed within the receiving portion 118A.

[0055] Intermediate gear 115 meshes with intermediate gear 114 at the opening in the upper part of receiving portion 118A. Furthermore, a through hole 118C is formed in the bottom of receiving portion 118A. The through hole 118C is formed in alignment with the meshing position of the teeth 117B of intermediate gear 115 and scraper gear 117. Intermediate gear 115 meshes with teeth 117B through this through hole 118C.

[0056] Furthermore, a sliding portion 118D is formed on the rotary guide 118, which has an arcuate shape along the rack portion 117A and the tooth portion 117B of the scraper gear 117. The sliding portion 118D is formed below the receiving portion 118A and is generally plate-shaped, protruding rearward from the rear surface of the rotary guide 118. The upper surface of the sliding portion 118D is formed, for example, along a circumference with a predetermined radius centered on the front end 43A of the first scraper member 43, similar to the rack portion 117A and the tooth portion 117B. When the rotary guide 118 is mounted on the retainer support portion 41, the rack portion 117A is supported from below by the sliding portion 118D, and the scraper gear 117 is held in a position where it can slide in an arcuate shape.

[0057] With the scraper retainer 42 installed on the retainer retainer portion 47, when viewed from one side in the front-rear direction, the teeth 117B of the rack portion 117A are formed along a circumference of a predetermined radius centered on the front end 43A of the first scraper member 43. Furthermore, the lower surface of the rack portion 117A and the sliding portion 118D of the rotation guide 118 are formed along a circumference of a predetermined radius centered on the front end 43A of the first scraper member 43, and a circumference smaller than the circumference of the teeth 117B. The scraper gear 117 supports the rack portion 117A by contacting the lower surface with the upper surface of the sliding portion 118D, allowing it to rotate and slide along this circumference. Thus, the front end 47B of the retainer retainer portion 47 is held by the scraper gear 117 and the rotation guide 118, and is rotatably held relative to the retainer support portion 41. That is, the front end of the first scraper member 43 is held by the scraper retainer 42 in a manner that allows rotation around the front end 43A.

[0058] Therefore, even if the front end 43A of the first squeegee member 43 is subjected to load by contact with the solder S or the screen mask M during the printing process, the load applied to the front end 43A is not easily transmitted to the servo motor 104 via the first squeegee member 43. The same applies to the second squeegee member 53. Thus, the load applied to the servo motor 104 can be reduced during the printing process. Printing can be performed with reduced power supplied from the servo motor 104 to the squeegee holder 42, for example, with the power supply to the servo motor 104 disconnected, thereby reducing power consumption during the printing process.

[0059] Next, the second drive unit 102 will be described. In the following description of the second drive unit 102, details identical to those of the first drive unit 101 described above will be omitted. The second drive unit 102 is mounted on the rear end 41F of the retainer support 41 in the front-rear direction. The second drive unit 102 includes: an intermediate gear 215, a scraper gear 217, a rotation guide 218, and a cover member 219 (see reference). Figure 2 Therefore, in the first embodiment, the first holding member drive unit 45 includes a servo motor 104 in the first drive unit 101, but does not include a drive source such as a motor in the second drive unit 102. Furthermore, Figure 5 and Figure 6 This indicates that the cover component 219 has been removed.

[0060] Intermediate gear 215 is mounted on the rear end of connecting shaft 103 in the same manner as intermediate gear 115. Therefore, the two intermediate gears 115 and 215 are connected to each other via connecting shaft 103 and rotate synchronously. Scraper gear 217, for example, has the same shape as scraper gear 117, having a rack portion and teeth, and is curved at a predetermined curvature. The teeth of scraper gear 217, like those of scraper gear 117, are formed along a circumference of a predetermined radius centered on the front end 43A of the first scraper member 43. The front end of scraper gear 217 is mounted on the rear end 47C of retainer holding portion 47. Rotary guide 218, for example, has the same shape as rotary guide 118, and is mounted on the rear end 41F of retainer support portion 41 by two bolts 223, holding scraper gear 217 relative to retainer support portion 41. Therefore, the rear end 47C of retainer holding portion 47 is held by retainer support portion 41 via scraper gear 217 and rotary guide 218.

[0061] The intermediate gear 215 is mounted on the rear end of the connecting shaft 103, which protrudes rearward from the through hole of the rotary guide 218, and is rotatably housed within the receiving portion of the rotary guide 218. Furthermore, when mounted on the retainer support 41, the rotary guide 218 supports the rack portion of the scraper gear 217 from below and holds the scraper gear 217 in a circular sliding motion. Thus, the scraper retainer 42 and the first scraper component 43 are held at their respective ends in the front-rear direction by the rotary guides 118 and 218, and are rotatably held relative to the retainer support 41.

[0062] In addition, such as Figure 2 and Figure 3 As shown, the cover component 119 has a box-shaped form that covers all gears, including the servo motor 104 and the drive source gear 113. The gear cover 121 is mounted on, for example, the intermediate gear 114 and rotates together with it. A scale indicator mark 121A is provided on the front surface of the gear cover 121 to indicate the scale 131 provided on the cover component 119. The numbers on the scale 131 indicate the rotation angle of the first scraper component 43.

[0063] Furthermore, the structure of the first retainer drive unit 45 described above is one example. For example, the first drive unit 101 may also be a structure that does not have either of the intermediate gears 114 and 115. Even without two intermediate gears 114 and 115, the teeth 113C of the drive source gear 113 may mesh with the teeth 117B of the scraper gear 117. Additionally, the number of intermediate gears 114 and 115 may be three or more. Furthermore, the drive source gear 113 may also be a structure that does not have the plate-shaped portion 113B but has teeth 113C formed on the outer periphery of the annular portion 113A. Additionally, the gear cover 121 may be mounted on a gear other than the intermediate gear 114, such as the drive source gear 113. Furthermore, the first retainer drive unit 45 may also be a structure that does not have the gear cover 121. In this case, the scale 131 may not be provided on the cover member 119. Furthermore, the first retainer drive unit 45 may also be a structure that has the first drive unit 101 but does not have the second drive unit 102 and the connecting shaft 103. In this case, the first drive unit 101 can also be mounted at the center of the retainer support 41 in the front-rear direction. In addition, the drive source for rotating the retainer holding part 47 is not limited to an electric motor, but can also be other drive sources such as a hydraulic cylinder or a linear motor.

[0064] Furthermore, the second scraper unit 50 has the same structure as the first scraper unit 40. For example, the second scraper unit 50 is symmetrical to the first scraper unit 40 in the left-right direction. Therefore, a detailed description of the second scraper unit 50 will be omitted.

[0065] In the screen printing machine 10 with the above-described structure, after the control device 90 controls the first and second squeegee lifting devices 60 and 70 to lower the first squeegee component 43 and raise the second squeegee component 53, it controls the motor 83 of the head moving device 80 to move the head body 31 horizontally to one side in the printing direction. This causes the solder S on the screen mask M to move to one side in the printing direction, thus performing printing (reciprocating printing). Alternatively, after the control device 90 controls the first and second squeegee lifting devices 60 and 70 to lower the second squeegee component 53 and raise the first squeegee component 43, it 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. This causes the solder S on the screen mask M to move to the other side in the printing direction, thus performing printing (repeated printing). For example, before starting the reciprocating printing described above, the control device 90 drives the servo motor 104 of the first holding member drive unit 45 to change the rotation angle of the first squeegee member 43, thereby changing the amount of solder S transferred to the substrate P through the pattern holes H of the screen mask M. Similarly, the control device 90 changes the rotation angle of the second squeegee member 53 during reciprocating printing.

[0066] (Regarding the installation sequence of the scraper components)

[0067] Next, the installation sequence of the squeegee components will be explained. The installation sequence of the second squeegee component 53 is the same as that of the first squeegee component 43. Therefore, the installation sequence of the first squeegee component 43 will be explained in the following description. First, the user determines the first squeegee component 43 and the squeegee holder 42 based on the width of the substrate P to be printed and the width of the screen mask M. The user uses the determined first squeegee component 43 and squeegee holder 42 to clamp the upper end of the first squeegee component 43 by the holder body 42A and the clamping part 42B. The user fixes the first squeegee component 43 to the squeegee holder 42 by tightening the fastening screw part 42E.

[0068] Next, the user installs the scraper retainer 42 into the retainer retaining part 47. The user aligns the four locating pins 49 with the positions of the four locating holes 42F and installs the scraper retainer 42 into the retainer retaining part 47. By inserting the locating pins 49 into the locating holes 42F, the position of the first threaded member 48 is aligned with the position of the threaded part 42D. With the locating pins 49 inserted into the locating holes 42F, the user inserts the tool 91 through the access hole 41B and tightens the first threaded member 48, thereby fixing the scraper retainer 42 to the retainer retaining part 47.

[0069] Next, the user installs a pair of solder paste guides 106A and 106B onto the retainer support portion 41. The user inserts the protrusion 37A of the sliding member 37 into the through hole 107C of the bracket 107, aligning the position of the screwed portion 37B with the position of the through hole of the base 107A. The user temporarily secures the solder paste guide 106A to the sliding member 37 by inserting the second screwing member 38 into the through hole of the base 107A and fastening it to the screwed portion 37B. Similarly, the user temporarily fixes the solder paste guide 106B to the other sliding member 37. With the second screwing member 38 released, the user slides the pair of solder paste guides 106A and 106B in the back-and-forth direction. The user positions the guide portions 108 of the pair of solder paste guides 106A and 106B adjacent to each other at both ends of the first scraper member 43 in the back-and-forth direction. When the user determines the position of the pair of solder paste guides 106A and 106B, they tighten all the second engagement parts 38 to secure the pair of solder paste guides 106A and 106B to the retainer support 41. This allows the scraper retainer 42, the first scraper component 43, and the pair of solder paste guides 106A and 106B to be installed on the retainer support 41. The user can also install the first scraper unit 40, on which the scraper retainer 42 is mounted on the retainer support 41, onto the first lifting shaft 61 (see reference). Figure 1 The first scraper component 43 is installed on the screen printing machine 10.

[0070] Furthermore, when removing the squeegee holder 42, the first squeegee component 43, and the pair of solder paste guides 106A and 106B from the holder support 41, the components can be removed in the reverse order described above. The installation and removal sequences described above are just one example. For instance, the solder paste guides 106A and 106B can be installed on the holder support 41 before the squeegee holder 42. Alternatively, the first squeegee component 43 can be installed on the squeegee holder 42 after the squeegee holder 42 has been installed on the holder support 47.

[0071] With the above structure, the scraper holder 42, the first scraper component 43, and the pair of solder paste guides 106A and 106B can be removed from the holder support 41 and cleaned. For example, the adhered solder S can be cleaned using an ultrasonic cleaner or the like while the first scraper component 43 is installed in the scraper holder 42.

[0072] Furthermore, the scraper retainer 42 and the solder paste guides 106A and 106B are formed of components that are chemically resistant to the cleaning fluid used to clean the first scraper component 43. Specifically, each component is formed of a stainless steel-based metal or a fluorine-based resin. For example, the clamping portion 42B and the bracket 107 of the scraper retainer 42 are formed of stainless steel. The main body 42A of the retainer is formed, for example, of aluminum. The guide portion 108 is formed, for example, of fluororesin. Thus, the scraper retainer 42 and the pair of solder paste guides 106A and 106B can be cleaned intact by the cleaning machine after being removed from the retainer support 41. For example, cleaning can be performed with the first scraper component 43 installed on the scraper retainer 42, or with the guide portion 108 installed on the bracket 107. Furthermore, the materials of the aforementioned components are examples and can be appropriately changed. For example, the guide portion 108 can also be formed of metal. Additionally, the materials of each component can be appropriately changed depending on the chemicals used in the cleaning process. Therefore, components can also be formed from materials other than stainless steel-based metals and fluorine-based resins.

[0073] Furthermore, as described above, in this embodiment, the first retainer drive unit 45 includes a servo motor 104 and a retainer retaining unit 47 that oscillates according to the rotation of the servo motor 104. The scraper retainer 42 is mounted to the retainer retaining unit 47 by screwing it into the first engagement member 48. Thus, the user can remove the scraper retainer 42 from the retainer retaining unit 47 by loosening the first engagement member 48. The scraper retainer 42 can be removed from the retainer support unit 41 while the first scraper member 43 is mounted on it. The scraper retainer 42 with the first scraper member 43 mounted on it can be cleaned.

[0074] Furthermore, the retainer support 41 has a pair of sliding members 37 that can slide in the longitudinal direction (i.e., the front-to-back direction) of the first scraper member 43. A pair of solder paste guides 106A and 106B are detachably mounted relative to each of the sliding members 37 via a second screw-on member 38. Thus, cleaning can be performed by removing the pair of solder paste guides 106A and 106B from the pair of sliding members 37. The bracket 107, on which the guide 108 is mounted, can be cleaned. Additionally, by mounting the solder paste guide 106A on the sliding member 37 and adjusting its sliding position, the solder paste guide 106A can be positioned appropriately according to the size of the first scraper member 43, etc. The same applies to the solder paste guide 106B.

[0075] The following explains the correspondence between the terminology used in the first embodiment and the terminology described in the claims. The second engagement member 38 of the first embodiment is an example of a second fixing member. The first retaining member drive unit 45 and the second retaining member drive unit 55 are examples of retaining member drive units. The retaining member holding unit 47 is an example of a swinging member. The first engagement member 48 is an example of a first fixing member. The head moving device 80 is an example of a moving device. The servo motor 104 is an example of a motor. The solder S is an example of a viscous fluid.

[0076] Based on the first embodiment described above, the following effects are achieved.

[0077] In one embodiment, the scraper retainer 42 holds the first scraper member 43 and is detachably mounted to the retainer retaining portion 47 of the retainer support portion 41 via the first engagement member 48. Furthermore, the scraper retainer 42, while mounted to the retainer retaining portion 47 using the first engagement member 48, is connected to the first retainer drive portion 45 and rotates based on the drive of the first retainer drive portion 45.

[0078] Therefore, by driving the first drive unit 101, the scraper holder 42 can be rotated, changing the angle of the first scraper component 43 relative to the screen mask M. Furthermore, the scraper holder 42 can be removed from the holder support 41 on which the first drive unit 101 is mounted using the first engagement member 48. The scraper holder 42, holding the first scraper component 43, can then be placed intact into an ultrasonic cleaner for cleaning, etc. Since the scraper holder 42 is separated from the holder support 41, it is possible to prevent cleaning fluid from adhering to the servo motor 104, etc.

[0079] (Second Embodiment)

[0080] Next, a second embodiment that embodies the contents of this disclosure will be described. Figure 7 The first scraper unit 140 of the second embodiment is shown. Furthermore, in the following description, the same reference numerals are used for structures identical to those in the first embodiment, and their descriptions are omitted as appropriate. The first scraper unit 40 of the first embodiment has a structure that includes a servo motor 104 as a drive source for rotating the first scraper member 43. On the other hand, the first scraper unit 140 of the second embodiment differs from the first scraper unit 40 of the first embodiment in that it includes two servo motors 104, 204 (drive sources).

[0081] like Figure 7As shown, the first retainer drive unit 245 of the first scraper unit 140 has a first drive unit 201 at the front end 41E of the retainer support unit 41 and a second drive unit 202 at the rear end 41F. 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 scraper gear 117. Similarly, 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 scraper gear 217. Therefore, in addition to the servo motor 104 of the first drive unit 201, the first retainer drive unit 245 of the second embodiment also includes a servo motor 204 in the second drive unit 202. That is, drive sources are provided in both drive units.

[0082] Furthermore, the first scraper unit 40 of the first embodiment includes a connecting shaft 103 that links the first and second drive units 101 and 102. However, the first scraper unit 140 of the second embodiment does not include the connecting shaft 103, and the first and second drive units 201 and 202 can operate independently of each other. A servo motor 204 is mounted on the front surface of the main body 211 and connected to the control device 90 via a cable 205. A drive source gear 213 and intermediate gears 214 and 215 are mounted on the rear surface of the main body 211. Additionally, Figure 7 The illustrations of the cover component 119 of the first drive unit 201, the cover component of the second drive unit 202, and a pair of solder paste guides 106A and 106B are omitted.

[0083] The scraper gear 217 and intermediate gear 215 have the same structure as in the first embodiment, but the intermediate gear 215 is not connected to the intermediate gear 115. Furthermore, the drive source gear 213 rotates under the drive of the servo motor 204. The scraper gear 217 slides by receiving rotational driving force from the drive source gear 213 via the intermediate gears 214 and 215. The control device 90, for example, synchronizes the operation of the two servo motors 104 and 204 based on encoder information, thereby linking the first drive unit 201 and the second drive unit 202. Thus, similar to the first embodiment, the angle of the first scraper member 43 can be changed. Even with this structure, the scraper holder 42 and solder paste guides 106A and 106B can be removed from the holder support 41 where the servo motors 104 and 204 are mounted and cleaned.

[0084] Furthermore, this disclosure is not limited to the above-described embodiments, and various improvements and modifications can be made without departing from the spirit of this disclosure, which goes without saying.

[0085] For example, in the above embodiments, the positioning pin 49 is provided in the retainer holding portion 47, and the positioning hole 42F is provided in the scraper retainer 42, but it is not limited to this. Alternatively, the positioning pin 49 may be provided in the scraper retainer 42, and the positioning hole may be provided in the retainer holding portion 47.

[0086] The quantity and position of the first engagement component 48 and the locating pin 49 can also be appropriately changed.

[0087] The retaining part 47 may also be a structure without the locating pin 49.

[0088] The screen printing machine 10 can have a structure with only one squeegee component and squeegee unit, or it can have a structure with three or more squeegee components and squeegee units. Therefore, the screen printing machine 10 can also have a structure with a first squeegee unit 40 but without a second squeegee unit 50.

[0089] In the first embodiment, the first drive unit 101 and the second drive unit 102 may not be located at the end of the retainer support unit 41. For example, the first drive unit 101 may be located at a position a predetermined distance rearward from the front end 41E of the retainer support unit 41.

[0090] Alternatively, in the first embodiment, the servo motor 104, the drive source gear 113, and the intermediate gear 114 may be disposed in the second drive unit 102.

[0091] The first scraper unit 40 can also be a structure in which the first scraper component 43 rotates around the front end 43A as the center.

[0092] The first scraper unit 40 may be a structure without solder paste guides 106A and 106B, or it may be a structure with one or more solder paste guides.

[0093] Furthermore, this disclosure is not limited to the dependent relationships described in the claims. For example, this specification also discloses the technical idea of ​​changing "the screen printing machine of claim 1" to "the screen printing machine of any one of claims 1 to 3" in claim 4. Additionally, for example, this specification also discloses the technical idea of ​​changing "the screen printing machine of claim 1" to "the screen printing machine of any one of claims 1 to 4" in claim 5. Furthermore, for example, this specification also discloses the technical idea of ​​changing "the screen printing machine of claim 1" to "the screen printing machine of any one of claims 1 to 5" in claim 6.

[0094] Explanation of reference numerals in the attached figures

[0095] 10 Screen printing machine, 37 Sliding component, 38 Second screw-in component (second fixing component), 41 Retaining support, 41B Access hole, 42 Squeegee retainer, 43 First squeegee component (squeegee component), 45, 245 First retaining drive (retaining drive), 47 Retaining part (swinging component), 47A Insertion hole, 48 First screw-in component (first fixing component), 53 Second squeegee component (squeegee component), 55 Second retaining drive (retaining drive), 80 Head moving device (moving device), 91 Tool, 104, 204 Servo motor (motor), 106A, 106B Solder paste guide, S Solder (viscous fluid).

Claims

1. A screen printing machine, comprising: Retaining component support; The retainer drive unit is mounted on the retainer support unit; and The scraper retainer, which holds the scraper component, is detachably mounted to the retainer support via a first fixing component. When mounted to the retainer support via the first fixing component, it is connected to the retainer drive unit and rotates based on the drive of the retainer drive unit.

2. The screen printing machine according to claim 1, wherein, The retainer drive unit has: Electric motor; The oscillating component oscillates in accordance with the rotation of the motor. The first fixing component is a screw-on component. The scraper retainer is mounted to the oscillating component by screwing it into the screwing component.

3. The screen printing machine according to claim 2, wherein, The scraper component is a plate-shaped component that is longer in one direction. The oscillating component has a plurality of insertion holes formed at predetermined intervals along the length of the scraper component for the threaded component to be inserted. The retainer support portion has a plurality of access holes that pass through the retainer support portion and are aligned with the insertion hole, allowing a tool that rotates the engagement component to be inserted.

4. The screen printing machine according to claim 1, wherein, The scraper component is a plate-shaped component that is longer in one direction. The screen printing machine also includes a solder paste guide that prevents the viscous fluid applied by the squeegee from flowing in a direction deviating from the printing direction, which is the direction in which the squeegee moves relative to the viscous fluid. The retainer support portion has a sliding member capable of sliding along the length direction of the scraper component. The solder paste guide is detachably mounted to the sliding component via a second fixing component.

5. The screen printing machine according to claim 1, wherein, The scraper retainer is made of a metal that is chemically resistant to the cleaning fluid used to clean the scraper components.

6. The screen printing machine according to claim 1, wherein, The screen printing machine also includes a moving device that moves the squeegee component relative to the viscous fluid in the printing direction. The retainer support is mounted on the moving device. When the squeegee retainer holding the squeegee component is mounted using the first fixing component, the retainer support moves in the printing direction based on the drive of the moving device.

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