DE112019007801T5 - screen printing device - Google Patents

Abstract

A screen printing machine includes a magazine, a plate holder, a transport device and a print head. The magazine stores a stencil plate having openings associated with electrodes disposed on a substrate. The plate holder releasably holds edges of the stencil plate. The transport device transports the stencil plate between the magazine and the plate holder. The print head fills paste placed on the stencil plate held by the plate holder into the openings.

Description

technical field

The present disclosure relates to a screen printing device that causes a print head to slide on a stencil plate to print solder paste, etc. on a substrate.

State of the art

Heretofore, there have been screen printers which screen print conductive solder paste, etc. on electrodes of a substrate. A stencil (mask) is brought into contact with the substrate to allow a squeegee of a print head to slide on the stencil so that paste applied to the stencil is transferred to the substrate. The stencil consists of a stencil sheet (mask body) with pattern holes corresponding to electrodes of the substrate and a stencil frame (mask frame) supporting the perimeter of the stencil plate.

For example, Patent Document 1 describes a stencil that has a stencil frame that supports the outer edge of a plate-like member made of resin that is attached to the outer edge of the stencil plate. The user mounts the stencil frame on a stencil holder to perform a screen printing process.

Patent Document 2 describes a screen printer in which the user attaches a stencil plate to the stencil holder.

Prior Art Document

patent document

• Patent Document 1: JP-A-2013-159022
• Patent Document 2: JP-A-2013-111847

Summary of the Invention

Problem to be solved by the invention

In the screen printers, a stencil plate is used that matches a substrate to be printed, and every time there is a model change of the substrate to be printed, the stencil plate has to be exchanged. In the conventional screen printer, as shown in Patent Document 1, the user performs stencil replacement by attaching or detaching the stencil frame to or from the plate holder, and thus the user's workload is large. Even though Patent Document 2 discloses a screen printing capable of attachment/detachment of a frameless stencil sheet, the user needs to exchange the stencil sheet.

It is therefore an object of the present disclosure to solve the above conventional problem to provide a screen printing machine capable of automatically exchanging a stencil plate.

means of solving the problem

• ein Magazin, das eine Schablonenplatte bevorratet, die Öffnungen aufweist, die Elektroden zugeordnet sind, die auf einem Substrat angeordnet sind;
• einen Plattenhalter, der Kanten der Schablonenplatte abnehmbar hält;
• eine Transportvorrichtung, die die Schablonenplatte zwischen dem Magazin und dem Plattenhalter transportiert; und
• einen Druckkopf, der Paste, die auf der von dem Plattenhalter gehaltenen Schablonenplatte angeordnet ist, in die Öffnungen füllt.

A screen printing machine of the present disclosure includes:

• a magazine stocking a stencil plate having openings associated with electrodes disposed on a substrate;
• a plate holder that detachably holds edges of the stencil plate;
• a transport device that transports the stencil plate between the magazine and the plate holder; and
• a print head that fills paste placed on the stencil board held by the board holder into the openings.

effect of the invention

According to the present disclosure, a screen printing machine capable of automatically exchanging a stencil plate can be provided.

character list

• 1 12 is a plan view of a main part of a screen printing machine according to an embodiment of the present disclosure.
• 2 14 is a perspective view of the main part of the screen printing machine according to the embodiment of the present disclosure.
• 3 12 is a side view of the main part of the screen printing machine according to the embodiment of the present disclosure.
• 4 Fig. 12 is a plan view of a stencil plate
• 5 12 is a perspective view of a moving body.
• 6 Fig. 14 is a perspective view of a stencil holder seen from below.
• 7(a) Fig. 12 is a plan view of a stencil holder, and 7(b) is a side view of a coupling element.
• 8th Fig. 12 is an explanatory view explaining a pneumatic control system.
• 9A Fig. 14 is an explanatory view explaining transportation of the stencil sheet.
• 9B Fig. 14 is an explanatory view explaining transportation of the stencil sheet.
• 9C Fig. 14 is an explanatory view explaining transportation of the stencil sheet.
• 10A Fig. 14 is an explanatory view explaining a transporting operation of the stencil sheet.
• 10B Fig. 14 is an explanatory view explaining the process of transporting the stencil sheet.
• 10C Fig. 14 is an explanatory view explaining the process of transporting the stencil sheet.
• 10D Fig. 14 is an explanatory view explaining the process of transporting the stencil sheet.
• 10E Fig. 14 is an explanatory view explaining the process of transporting the stencil sheet.
• 10F Fig. 14 is an explanatory view explaining the process of transporting the stencil sheet.
• 10G Fig. 14 is an explanatory view explaining the process of transporting the stencil sheet.
• 11 Fig. 12 is a plan view of the stencil sheet transported to an attachment/detachment position Pa.
• 12A Fig. 14 is an explanatory view explaining a process of attaching the stencil board to a board holder.
• 12B Fig. 14 is an explanatory view explaining the process of attaching the stencil board to the board holder.
• 12C Fig. 14 is an explanatory view explaining a process of attaching the stencil board to a board holder.
• 12D Fig. 12 is an explanatory view explaining a process of attaching the stencil board to a board holder.
• 13 Fig. 14 is an explanatory view explaining an action of performing a screen printing work.
• 14 Fig. 12 is an explanatory view explaining an action of performing the screen printing work.
• 15 Fig. 12 is an explanatory view explaining an action of performing the screen printing work.
• 16 is a front view of a magazine.
• 17 Figure 12 is a plan view of the magazine with its top wall removed.
• 18(a) Fig. 14 is a perspective view of a main part inside the magazine, and 18(b) is a side view of the magazine seen from its longitudinal section.
• 19 Fig. 14 is a perspective view of a main front portion inside the magazine.

form for carrying out the invention

According to a first aspect of the present disclosure, there is provided a screen printing machine comprising: a magazine storing a stencil plate having openings corresponding to electrodes arranged on a substrate; a plate holder that detachably holds edges of the stencil plate; a transport device that transports the stencil plate between the magazine and the plate holder; and a print head that fills paste placed on the stencil board held by the board holder into the openings.

A second aspect of the present disclosure provides the screen printing machine of the first aspect, wherein the transport device transports the stencil board under the board holder, and the board holder attaches or detaches the stencil board to or from a bottom portion of the board holder.

A third aspect of the present disclosure provides the screen printing machine of the first or second aspect, wherein the plate holder clamps the stencil plate while applying tension to the stencil plate in a planar direction.

A fourth aspect of the present disclosure provides the screen printing machine of the second or third aspect, comprising an elevating device that moves the plate holder to a clamping position at a lower height where the stencil plate is clamped and to a waiting position at a higher height.

A fifth aspect of the present disclosure provides the screen printing machine of the fourth aspect, wherein the stencil plate has a plurality of holes formed along its outer edge, and the plate holder has a plurality of projections projecting downward, the plurality of projections in the plurality of holes of the stencil plate as a result of movement of the plate holder to the Clamping position, brought about by the lifting device, are used.

A sixth aspect of the present disclosure provides the screen printing machine of the fifth aspect, wherein the plate holder includes an actuator that moves the plurality of projections outward in a planar direction to thereby apply tension to the stencil plate.

A seventh aspect of the present disclosure provides the screen printing machine of the sixth aspect, wherein the actuator is an air cylinder that operates with compressed air pressure.

An eighth aspect of the present disclosure provides the screen printing machine of the sixth aspect, wherein the actuator includes: a first air cylinder which pushes the projections inserted into the holes formed on a pair of parallel outer edges of the stencil plate in the planar direction moved outside; and a second air cylinder that moves the protrusions inserted into the holes formed on another pair of the outer edges outward in the planar direction perpendicular to the moving direction caused by the first air cylinder.

A ninth aspect of the present disclosure provides the screen printing machine of the eighth aspect, including a plate holder driving part that separately regulates an air pressure supplied to the first air cylinder and an air pressure supplied to the second air cylinder.

A tenth aspect of the present disclosure provides the screen printing machine of any one of the first to ninth aspects, wherein the transporting device comprises: a moving body including a holding part, the holding part crossing a transporting direction and holding the stencil board, the moving body holding the stencil board in the transport direction transported; and a pair of guide rails arranged along the transporting direction of the stencil board, the pair of guide rails supporting the stencil board transported by the moving body from below.

An eleventh aspect of the present disclosure provides the screen printing machine of the tenth aspect, wherein the holding part includes a suction part that sucks the stencil plate.

A twelfth aspect of the present disclosure provides the screen printing machine of the eleventh aspect, wherein the holding part holds a portion of the stencil plate exposed between the pair of guide rails from below, and the moving body includes a vertical driving part that vertically moves the holding part.

A thirteenth aspect of the present disclosure provides the screen printing machine of the twelfth aspect, wherein the holding part includes: an upper surface in contact with a lower side of the stencil plate; and a pin protruding upward from the top surface, and wherein the suction part opens to the top surface to suck and hold the underside of the stencil plate.

A fourteenth aspect of the present disclosure provides the screen printing machine of the thirteenth aspect, wherein the holding part includes at least two of the suction parts that are spaced from each other in the transporting direction, with the pin interposed between the two suction parts.

A fifteenth aspect of the present disclosure provides the screen printing machine of any one of the first to fourteenth aspects, wherein the guide rails include a recess part to avoid interfering with the projections protruding downward from the plate holder.

Hereinafter, an exemplary embodiment of a screen printing machine according to the present disclosure will be described with reference to the accompanying drawings. The present disclosure is not limited to specific configurations of the following embodiments, and includes configurations based on similar technical ideas.

<Embodiment>

An embodiment of the present disclosure is described below with reference to FIG 1 until 4 to be discribed. 1 12 is a plan view of a main part of a screen printing machine 1. 2 14 is a perspective view of the main part of the screen printing machine 1. 3 12 is a side view of the main part of the screen printing machine 1. 4 14 is a plan view of a stencil plate 15. In the screen printing machine 1, the stencil plate 15 stored in a magazine 81 is transported to an attachment/detachment position Pa of a plate holder 14 and is attached to the plate holder 14 at the attachment/detachment position Pa. The screen printing machine 1 also brings the stencil plate 15 into contact with a substrate 2 to deposit solder paste or the like on each of a plurality of electrodes 3 formed on the Substrate 2 are arranged to print in the screen printing process.

Subsequently, the conveying direction of the stencil plate 15 is the X-axis direction (front-rear direction), the moving direction of the substrate 2 is the Y-axis direction (left-right direction), and the up-down direction is the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other. The user who operates the screen printing machine 1 is usually located on the side (in the X-axis direction) towards which the stencil plate 15 is drawn out from the magazine 81, and here the side where the user is located is the front of the Screen printing machine 1, while the opposite side on which the magazine 81 is placed is the back of the screen printing machine 1.

The screen printing machine 1 comprises a base 10, a unit moving mechanism 12A, a substrate holding unit 12, the magazine 81, the plate holder 14, a transport device 51, a print head 16 and a control unit 19. The magazine 81 stores a plurality of plate-like stencil plates 15. The plate holder 14 is arranged above the substrate holding unit 12 . The transporting device 51 transports the stencil plate 15 in one stroke from the magazine 81 upward to the attaching/detaching position Pa. The print head 16 is positioned above the platen holder 14 . The control unit 19 controls operations of the parts of the screen printing machine 1 . The screen printing machine 1 includes a cover 10a covering over the base 10. As shown in FIG. The main components such as the unit moving mechanism 12A, the substrate holding unit 12, the plate holder 14, the transport device 51 and the print head 16 are arranged within a space surrounded by the cover 10a. The control unit 19 is housed inside the base 10 .

The substrate introduction conveyors 11 guide the substrate 2, which is loaded outside the screen printing machine 1, through an introduction entrance 8 of the cover 10a (into the 1 , 2 and 3 indicated arrow R1) to deliver the substrate 2 to the substrate holding unit 12. The substrate carry-out conveyors 13 carry out the substrate 2 received from the substrate holding unit 12 to the outside of the screen printing machine 1 through a carry-out exit 9 of the cover 10a (into the 1 , 2 and 3 indicated arrow R2). The substrate 2 is transported in the order of the substrate carry-in conveyors 11, the substrate holding unit 12, and the substrate carry-out conveyors 13.

The substrate holding unit 12 includes a unit base 21, a pair of conveyors 22, a lower receiving portion 24, and a pair of substrate holders 25. The unit base 21 is supported by the unit moving mechanism 12A. The unit moving mechanism 12A is an XYZθ table for moving the substrate holding unit 12 in a horizontal plane (in the XY plane) or in the Z-axis direction and rotating the substrate holding unit 12 in the θ-direction (around the Z-axis). The pair of conveyors 22 are fixed to the unit base 21 . The lower receiving part 24 is raised or lowered by a lift cylinder 23 arranged on the unit base 21, and lifts and supports the substrate 2 from below so that both ends of the substrate 2 transported by the conveyors 22 and at a fixed working position (in 2 designated position) are positioned away from the conveyors 22 are separated upwards. The pair of substrate holders 25 are arranged to be freely openable or closable in the X-axis direction and are opened or closed by an unillustrated actuator. The pair of substrate holders 25 clamp both ends in the X-axis direction of the substrate 2 lifted and supported by the lower receiving part 24 to hold the substrate 2 . The lower receiving part 24 lifts the substrate 2 so that an upper surface of the substrate 2 is level with upper surfaces of the substrate holders 25 . The lift cylinder 23, the conveyors 22 and the substrate holders 25 operate in accordance with commands from the control unit 19.

The stencil plate 15 is a mask to print paste on the electrodes of the substrate 2 with the screen printing method. The stencil plate 15 is made of metal, for example, and is made of SUS in a first embodiment, but may be made of resin. The stencil plate 15 has, for example, a rectangular shape such as a rectangle or a square, and is stored in the stocker 81 without being held by a frame. In the 2 and 4 For example, the template plate 15 has a plurality of openings 15a corresponding to an arrangement pattern of the electrodes 3 on the substrate 2 at its central portion. The stencil plate 15 has on its edge portion along each of four sides a plurality of holes 15b penetrating in the thickness direction. Each of the holes 15b is formed in a long hole extending in the parallel direction to the adjacent side. The stencil plate 15 has an alignment mark 15m formed thereon.

The print head 16 moves paste placed on the stencil plate 15 to thereby print paste on the electrodes of the substrate 2. FIG. In the 1 and 2 the print head 16 comprises a base member 41 moving in the X-direction, two squeegee lifting members 42, squeegee holders 43 and two squeegees 44. The base member 41 is freely movable in the X-axis direction over a range over that of the Plate holder 14 held stencil plate 15 arranged. The squeegee lifting parts 42 are fixed to the base member 41 so that their output shafts 42a protrude from the base member 41 downward. The squeegee holders 43 are fixed to lower ends of the output shafts 43a of the squeegee lifting members 42 and extend in the Y-axis direction. The squeegees 44 are thin plate members which are held at their upper ends by the squeegee holders 43 and which extend diagonally downward. The base member 41 is coupled to a print head moving mechanism 41a. The print head moving mechanism 41a moves the base member 41 in the X direction and operates based on an instruction from the control unit 19. As a result, the print head 16 moves relative to the stencil plate 15.

In accordance with commands from the control unit 19, there are performed: actions that transport the substrate 2 by the conveyors 22 of the substrate holding unit 12 and position the substrate 2 at a working position; acts that receive the substrate 2 placed at the working position from below through the lower receiving part 24 and clamp the substrate 2 by the pair of substrate holders 25; and moving actions of the substrate holding unit 12 in the horizontal plane and in the vertical direction. That is, the control unit 19 controls them to perform the various actions.

The control unit 19 includes an image recognition unit 19a, a mechanism control unit 19b, a tension control unit 19c, and a memory 19d. The control unit 19 includes, for example, a processor, FPGA, etc. Each of the image recognition unit 19a, the mechanism control unit 19b, and the tension control unit 19c may be constituted by a plurality of processors, etc., or by a single processor.

The memory 19d stores various production data required to print solder paste or the like on the substrate 2 by screen printing. The memory 19d is a storage device constituted by at least one of a memory, a hard disk, an SSD, etc., and stores a processing program for each of the image recognition unit 19a, the mechanism control unit 19b, and the tension control unit 19c.

The mechanism control unit 19b operates the substrate holding unit 12, the unit moving mechanism 12A, the print head 16, the transport device 51, a hopper lifter 91, the print head moving mechanism 41a, a plate holder driving part 36 (details of which will be described later) to enable them to substrate transport and positioning operations, the printing operation, stencil plate exchanging operation, etc. to perform.

In 1 For example, the reciprocating movement of the print head 16 in the X-axis direction is performed by the mechanism control unit 19b, which controls the operation of the print head moving mechanism 41a. The elevating action of each squeegee 44 with respect to the base member 41 is performed by the mechanism control unit 19b, which controls the operation of the squeegee elevating part 42 associated with the squeegee 44, thereby raising or lowering the squeegee holder 43.

Referring to the 1 , 3 and 5 Next, the transport device 51 which transports the stencil plate 15 will be described. The transporting device 51 transports the stencil board 15 between the magazine 81 and the attachment/detachment position Pa where the stencil board 15 is attached to the board holder 14 or detached therefrom. The transporting device 51 includes: a holding part 53 that is held via holes 15b formed at edges substantially perpendicular to a transporting direction (X-axis direction) of the stencil board 15 and that transports the stencil board 15 in the transporting direction; a pair of guide rails 55 arranged along the conveying direction of the stencil plate 15; a Y-axis support 59 (moving body); and a Y-axis carrier moving part 59a which drives the Y-axis carrier 59 in the transporting direction. The transporting device 51 transports the stencil board 15 while sliding both sides of the transporting device 51 in parallel to the transporting direction of the stencil board 15 on the guide rails 55 . The Y-axis carrier moving part 59a includes mechanism components such as a motor and a feed screw, not shown, for moving the Y-axis carrier 59 in the X-axis direction. The holding part 53 is thereby moved in the transporting direction (X-axis direction) between the pair of guide rails 55 .

The guide rails 55 are guide members that guide the stencil plate 15 between the magazine 81 and the attachment/removal position tion pa lead. The guide rails 55 each have, for example, an L-shaped vertical cross section, and include a horizontal portion 55a supporting the stencil plate 15 from below and a wall portion 55b extending upward from the horizontal portion 55a. The guide rails 55 are connected to each other at their respective end portions in the direction of the plate holder 14 by a supporting plate 56 . The support plate 56 supports a front edge of the stencil plate 15 transported to the attachment/detachment position Pa.

The holding part 53 holds the stencil plate 15 to be transported between the magazine 81 and the attaching/detaching position Pa right under the plate holder 14 . The holding part 53 has a rectangular shape in a plan view, for example. The holding part 53 has an upper surface 53s in contact with an underside of the stencil plate 15. As shown in FIG. This upper surface 53s includes pins 58 engaged with the stencil plate 15 and recesses 57 functioning as sucking parts sucking the stencil plate 15. FIG.

In particular, the upper surface 53s of the holding part 53, as shown in FIG 5 1, has a pair of juxtaposed recesses 57 as suction parts spaced in the conveying direction. The pins 58 are juxtaposed on the upper surface 53s between the recesses 57 in the transport direction. Accordingly, the recesses 57 are formed in front of and behind the pins 58 . Although at least two recesses 57 are required at positions arranging the pins 58 therebetween, a plurality of recesses may be arranged side by side on the holding part 53 in the direction perpendicular to the transporting direction. For example, two recesses 57 are arranged along the side of the holding part 53 toward the magazine 81 . Each recess 57 has a bottom surface formed with a suction hole 57a. Each suction hole 57a is connected to a suction device 61 so that the recesses 57 suck the overlying stencil plate 15 when the suction device 61 operates. The suction device is, for example, a vacuum pump or a vacuum ejector. The holding part 53 holds a portion exposed downward between the pair of guide rails 55 from below.

The holding part 53 is vertically movable by a holding part elevating mechanism 54a. The holding part elevating mechanism 54a is, for example, an air cylinder. The holding member elevating mechanism 54a is attached to the Y-axis bracket 59 movable along the wall portions 55b of the guide rails 55, for example. The Y-axis stage 59 moves in a space interposed by the guide rails 55 and the substrate holding unit 12 . The holding part elevating mechanism 54a is mounted on a rear side of the Y-axis bracket 59 . The Y-axis stage 59 is coupled to the Y-axis stage moving part 59a and is moved in the transport direction (X-axis direction) by the Y-axis stage moving part 59a. The holding part 53 is thereby movable in the X-axis direction together with the holding part lifting mechanism 54a.

On the front of the Y-axis bracket 59 are fixed a downward imaging camera 17a with a downward imaging field of view and an upward imaging camera 17b with an upward imaging field of view. The downward imaging camera 17a and the upward imaging camera 17b are moved in the Y-direction by a camera moving mechanism (not shown) built in the Y-axis bracket 59. As shown in FIG. The downward imaging camera 17a images an alignment mark 2m on the substrate 2 . The upward imaging camera 17b images the alignment mark 15m on the stencil plate 15. FIG.

In 3 Moving actions in the horizontal plane of the downward imaging camera 17a and the upward imaging camera 17b are performed by the mechanism control unit 19b, which controls the operations of the Y-axis stage moving part 59a and the camera moving mechanism. The imaging operation of the downward-imaging camera 17a and the imaging operation of the upward-imaging camera 17b are respectively controlled by the control unit 19, and image data obtained by the imaging operation of the downward-imaging camera 17a and image data obtained by the imaging operation of the upward imaging camera 17b are respectively transmitted to the control unit 19 and subjected to image recognition processing in the image recognition unit 19a of the control unit 19. This detects the position of the stencil plate 15 held by the plate holder 14 and the position of the substrate 2 held by the substrate holding unit 12.

The plate holder 14 couples to the transported stencil plate 15 and holds it. The plate holder 14 includes a holder frame 14a whose central portion opens in a rectangular shape, and coupling members 30 coupled to an outer peripheral edge of the stencil plate 15 in the holder frame 14a.

The coupling members 30 include two first coupling members 31 that extend in the X-axis direction and are respectively coupled to both edges of the stencil plate 15 (vertical sides of the stencil plate 15) that face in the Y-axis direction, and two coupling members 32 that extend in the Y-axis direction and are respectively coupled to both edges of the stencil plate 15 (transverse sides of the stencil plate 15) facing in the X-axis direction. The two first coupling members 31 are movable in the plate holder 14 in the direction (Y-axis direction) perpendicular to these two first coupling members 31, while the two second coupling members 32 in the plate holder 14 are movable in the direction (X-axis direction) perpendicular to these two second Coupling elements 32 are movable.

The coupling members 30 (two first coupling members 31 and two second coupling members 32) have coupling projections 30a protruding from respective lower surfaces, each projection 30a having a dimension in the extending direction (direction along the sides of the stencil plate 15) of the holes 15b that is smaller than that of each of the holes arranged along the four sides of the stencil plate 15. The holder frame 14a has holes 14b to allow the projections 30a to protrude from the inside to the outside of the holder frame 14a.

The disc holder 14 is movable to two positions, ie, a waiting position Pw at a high level and a clamping position Pc at a low level. Movement of the plate holder 14 to the two positions is carried out by elevators 71 arranged on the screen printing machine 1. FIG. The jacks 71 are fixed to the wall portions 55b of the pair of guide rails 55, respectively. The jacks 71 are connected to an upper surface of the holder frame 14a of the disc holder 14 . The jacks 71 are, for example, air cylinders. At the clamping position Pc, each of the projections 30a of the plate holder 14 is inserted into each of the holes 15b located at the edge of the stencil plate 15, and then the projections 30a move outward in the planar direction of the stencil plate 15, thereby removing the stencil plate 15 to be attached to the plate holder 14. At the clamping position Pc, the horizontal portions 55a of the guide rails 55 have holes 55c (see also 12C ). The holes 55c are formed for the purpose of avoiding interference between the horizontal portions 55a and the projections 30a of the disc holder 14 which has moved to the clamping position Pc and allowing the lower ends of the projections 30a to pass through the holes 15b of the Pass through stencil plate 15 to project under the underside of stencil plate 15 securely. That is, the holes 55c function as recess parts to prevent the guide rails 55 from interfering with the projections 30a protruding downward from the disc holder 14. Similar recessed portions are formed on the support plate 56 as well.

The plate holder 14 is equipped with drive cylinders 35. The power cylinders 35 include two first air cylinders 35a and two second air cylinders 35b. As in 12C 1, the respective piston rods 35e of the first air cylinders 35a extend in the Y-axis direction and are coupled with the pair of first coupling members 31 such that advancement and retreat of the piston rods causes the first coupling members 31 to move in the opposite directions to each other move. Likewise, the respective piston rods of the second air cylinders 35b also extend in the X-axis direction and are coupled with the pair of second linkage members 32 such that advancement and retreat of the piston rods causes the second linkage members 32 to move in the opposite direction to each other. The plate holder driving part 36 actuates the first air cylinders 35a and the second air cylinders 35b to apply tension to the stencil plate 15. FIG.

The screen printing machine 1 includes the plate holder driving part 36. In 8th the disc holder driving part 36 is connected to a pipe 39 which connects to an external pressure source 40 . The piping 39 branches into three systems inside the disk holder driving part 36. A first system piping 37 is connected to the two first air cylinders 35a. The disc holder driving part 36 comprises a valve 37a and a first pressure regulator part 37b connected in series to the piping 37 of the first system. A second system conduit 38 is connected to the two air cylinders 35b. The disc holder driving part 36 comprises a valve 38a and a second pressure regulator part 38b which are connected in series with the piping 38 of the second system. A third system conduit 72 is connected to the two jacks 71 . The disc holder drive part 36 includes a valve 72a and a third pressure regulator part 72b connected in series to the piping 72 of the third system. The valves 37a, 38a and 72a are controlled by the mechanism control unit 19b of the control unit 19 to supply compressed air pressures to the first air cylinders 35a, the second air cylinders 35b and the elevator 71 and to lock up. When the valves 37a and 38a open to supply compressed air pressures to the first air cylinders 35a and the second air cylinders 35b, the four air cylinders 35a and 35b with the four couplers 30 coupled to the edge of the stencil plate 15 to the opposite couplers 30 in moves the direction away from each other to thereby pull the entire stencil plate 15 in the horizontal plane direction so that a tension can be applied to the stencil plate 15 . When the valve 72a operates to lower the elevator 71, the disk holder 14 can be moved from the waiting position Pw to the clamp position Pc. When the valve 72a operates in the opposite direction, the disk holder 14 can be moved to the waiting position Pw.

The first pressure regulator part 37b and the second pressure regulator part 38b separately regulate compressed air pressures supplied to the first air cylinders 35a and the second air cylinders 35b. That is, the disc holder driving part 36 can separately regulate air pressures supplied to the first air cylinders and air pressures supplied to the second air cylinders. By thereby appropriately regulating compressed air pressures, a tension of the stencil plate 15 can be regulated. In the embodiment, since the compressed air pressures can be controlled with two systems divided in the X-direction and Y-direction, a tension of the stencil plate 15 can be separately controlled in the X-direction and Y-direction. An electropneumatic regulator is available as the first pressure regulator part 37b and the second pressure regulator part 38b. In the case of using the electropneumatic regulator, pressure control is performed by an input value from the voltage control unit 19c (see Fig 3 ) of the control unit 19 is executed. As a result, by previously storing in the memory 19d information about an optimum compressed air pressure of the stencil plates stocked in the magazine 81, the tension control unit 19c reads associated data from the memory 19d when the stencil plate is exchanged to automatically adjust the data set in the first pressure regulator part 37b and the second pressure regulator part 38b. That is, tension adjustment in accordance with replacement of the stencil plate 15 can also be automated. In the embodiment, although the first air cylinders 35a and the second air cylinders 35b are driven in air pressure circuits of different systems, they may be driven in a single system.

Referring to the 9A until 9C and the 10A until 10G Next, schematic actions of the screen printing machine 1 will be described. the 9A until 9C 12 are schematic explanatory views explaining from transferring the stencil plate 15 of the screen printing machine 1 from the magazine 81 to fixing it to the plate holder 14. FIG. The stencil plate 15 fed out from the magazine 81 as shown in FIG 9A is transported to the attaching/detaching position Pa below the disc holder 14 as shown in FIG 9B is shown. By the mechanism control unit 19b controlling the driving of the elevators 71, the plate holder 14 is moved down toward the stencil plate 15 located at the attachment/detachment position Pa, as shown in FIG 9C is shown to clamp the stencil plate 15. First, actions of the transport device 51 that transport the stencil plate 15 stored in the magazine 81 to the attachment/detachment position Pa below the plate holder 14 will be described.

As in 9A 1, the screen printing machine 1 includes the magazine elevator 91 which adjusts the height of the magazine 81. The magazine elevator 91 moves the magazine 81 in accordance with an instruction from the control unit 19 so that the stocking height of the stencil plate 15 to be used coincides with the height of the upper surfaces of the horizontal portions 55a of the guide rails 55.

As in 10A 1, the Y-axis support moving part 59a drives the holding part 53 under the stencil plate 15 to be transported, from the stencil plates 15 stored in the magazine 81, toward the rear of the magazine 81 to move the holding part 53 so that that the pins 58 of the holding part 53 are positioned directly below the holes 15b formed along the front edge of the stencil plate 15.

As in 10B 1, the holding part elevating mechanism 54a moves the holding part 53 from a storage position to a transport position. As a result, the pins 58 of the holding member 53 are inserted into the holes 15b formed along the front edge of the stencil plate 15. FIG. At the same time, the suction device 61 is actuated to introduce vacuum into the recesses 57 behind the pins 58 (on the right of the sheet) to suck and hold the stencil plate 15.

As in 10C 1, next, the Y-axis stage moving part 59a moves the holding part 53 toward the attaching/detaching position Pa under the disc holder 14. The pins 58 of the holding part 53 meet inner edges at this time of the holes 15b of the stencil plate 15 to carry out the stencil plate 15 from the magazine 81. While opposite edges of the stencil plate 15 parallel to the transport direction are supported on the horizontal portions 55a of the guide rails 55, the stencil plate 15 slides and is transported on the horizontal portions 55a. Since the recesses 57 of the holding part 53 suck the underside of the stencil plate 15, the holding part 53 can hold the stencil plate 15 in a stable manner.

In the case where the holding part 53 has a short transport stroke, the holding part 53 moves from the magazine 81 to the attachment/detachment position Pa under the disc holder 14 through two moving steps. At an intermediate position Pm between the magazine 81 and the attaching/detaching position Pa, the holding part 53 reinserts the pins 58 into the rear holes 15b from the front holes 15b of the stencil plate 15. FIG.

As in 10D 1, the Y-axis stage moving part 59a moves the holding part 53 to the intermediate position Pm. At the intermediate position Pm, the holding part elevating mechanism 54a moves the holding part 53 down from the transporting position to the retracting position in response to an instruction from the mechanism control unit 19b. The pins 58 of the holding member 53 are thereby pulled out from the holes 15b formed along the front edge of the stencil plate 15. FIG.

As in 10E 1, the Y-axis stage moving part 59a moves the holding part 53 toward the magazine 81 in response to an instruction from the mechanism control unit 19b to move the holding part 53 so that the pins 58 of the holding part 53 are directly under the holes 15b are positioned, which are formed along the rear edge of the stencil plate 15.

As in 10F 1, the holding part elevating mechanism 54a next moves the holding part 53 up from the retracting position to the transporting position in response to an instruction from the mechanism control unit 19b. The pins 58 of the holding member 53 are thereby inserted into the holes 15b formed along the rear edge of the stencil plate 15. FIG.

As in the 10G and 11 1, the Y-axis carrier moving part 59a next moves the holding part 53 toward the attaching/detaching position Pa under the disc holder 14 in response to an instruction from the mechanism control unit 19b Holes 15b formed along the rear edge of the stencil plate 15 to transport the stencil plate 15 from the intermediate position Pm toward the attaching/detaching position Pa.

When transported further forward from the intermediate position Pm, the front of the stencil plate 15 finally rides on the support plate 56 so that the front of the stencil plate 15 is supported on the support plate 56. FIG. Thereafter, the suction device 61 stops suction in response to an instruction from the mechanism control unit 19b, while the holding part elevating mechanism 54a moves the holding part 53 down from the transport position to the retracting position to stop holding the stencil plate 15 by the holding part 53. The Y-axis carrier 59 is then moved to retract the Y-axis carrier 59 to a position that does not interfere with the substrate holding unit 12, which thereafter rises to the attaching/detaching position Pa.

As above, the stencil board 15 is moved under the board holder 14 by the magazine 81 toward the attachment/detachment position Pa. Stocking operations for transporting the stencil plate 15 from the attaching/removing position Pa to the magazine 81 and stocking it in the magazine 81 are performed as operations reverse in order to the transporting operations. The transporting operation and the stocking operation are opposite to each other in the transporting direction even if the stencil plate 15 and the holding part 53 are engaged at the same position.

Referring to the 12A until 12D Next, schematic operations that attach the stencil board 15 located at the attachment/detachment position Pa to the board holder 14 will be described.

12A 12 shows a state in which the stencil plate 15 has arrived at the attachment/detachment position Pa. From this state, the mechanism control unit 19b operates the unit moving mechanism 12A to raise the substrate holding unit 12 so that the platen holder 14 rises (see arrow Z2 of Fig 12B) . As in 12B As shown, the plate holder 14 lifts a part of the stencil plate 15 and stops at the attachment/removal height of the stencil plate 15. This allows the stencil plate 15 bending downward between the pair of guide rails 55 to be stored horizontally.

The mechanism control unit 19b then sends a drive command to the jacks 71. The jacks 71 move the disk holder 14 from the waiting position Pw at a higher level to the clamped position Pc at a lower level (arrow Z3 of 12B) . The plate holder 14 allows the projections 30a protruding from its bottom surface to be inserted into the holes 15b of the stencil plate 15, respectively. As a result, the protrusions 30a protrude as shown in FIG 12B shown, into the holes 15b of the stencil plate 15.

The mechanism control unit 19b then sends an instruction to the disc holder driving part 36 to open the valves 37a and 38a. As a result, air at a pressure regulated by the first pressure regulator part 37b is supplied through line 37 of the first system to the first air cylinders 35a, while air at a pressure regulated by the second pressure regulator part 38b is supplied through line 38 of the second system is supplied to the second air cylinders 35b so that the first air cylinders 35a and the second air cylinders 35b are driven to cause the four coupling members 30 to move outwardly from the disc holder 14. When the coupling members 30 move outward, the projections 30a of the coupling members 30 push the holes 15b of the stencil plate 15 outward (also see arrow G1 of Fig 12C ). As a result, a tension is applied to the stencil plate 15 so that the stencil plate 15 is kept horizontal. In 12C the first coupling members 31 and the projections 30a before movement are indicated by dashed lines, and those after the movement are indicated by solid lines.

The mechanism control unit 19b then operates the unit moving mechanism 12A to move the substrate holding unit 12 (arrow Z4 of FIG 12D ) to lower. This completes the attachment of the stencil plate 15 to the plate holder 14. Separation of the stencil plate 15 from the plate holder 14 can be achieved by performing operations in the reverse order to the above operations. When attachment of the stencil plate 15 to the plate holder 14 is completed, the upward imaging camera 17b is moved under the stencil plate 15 as shown in FIG 12D is shown to depict the alignment mark 15m ( 2 ), which is arranged on the stencil plate 15. The image is then subjected to recognition processing by the image recognition unit 19a to recognize the position of the template plate 15 (template recognition). The position of the stencil plate 15 recognized by the stencil recognition is stored in the memory 19d as information available when the substrate 2 is positioned.

Referring to the 13 until 15 Next, a description will be given of actions of the screen printing machine 1 that performs a screen printing work. First, when transport of the substrate 2 from another device on the upstream process side is detected, the mechanism control unit 19b actuates the substrate insertion conveyors 11 and the conveyors 22 of the substrate holding unit 12 to introduce the substrate 2 to the substrate holding unit 12 (see 13 ). The mechanism control unit 19b then actuates the substrate holding unit 12 to hold the substrate 2. FIG. Specifically, holding of the substrate 2 is performed by pushing up the lower receiving part 24 by the lift cylinders 23 so that the height of the top surface of the substrate 2 matches the height of the top surfaces of the substrate holders 15 and the pair of substrate holders 25 in theirs is driven in the closed direction to clamp both ends of the substrate 2 (see 14 ).

When the substrate 2 is held, the mechanism control unit 19b operates the Y-axis stage moving part 59a and the camera moving mechanism (not shown) to position the downward-facing camera 17a at the alignment mark 2m ( 2 ) placed on the substrate 2 to allow the downward imaging camera 17a to image the mark 2m (see arrow H1 of 14 ). The obtained image data of the mark 2m is processed by the image recognition unit 19a to find the position of the mark 2m on the substrate holding unit 12 to recognize the position of the substrate from the found position of the mark 2m (substrate recognition). The control unit 19 calculates a horizontal movement distance and a rotation angle for aligning the substrate 2 with the template plate 15 from the position of the template plate 15 read from the memory 19d and the position of the substrate 2 found by substrate recognition. Based on the result of this calculation the mechanism control unit 19b operates the unit moving mechanism 12A to move the substrate holding unit 12, thereby performing alignment between the substrate 2 and the stencil plate 15.

As in 15 1, when the alignment between the substrate 2 and the stencil plate 15 is completed, the control unit 19 controls the actuation of the unit moving mechanism 12A to raise the substrate holding unit 12 so that the pair of substrate holders 25 holding the substrate 2 face the underside of the stencil plate 15 from relatively below to press the upper surfaces of the Paa res of the substrate holder 25 and the upper surface of the substrate 2 in contact with the underside of the stencil plate 15 (see arrow Z1). This leads to the state where the electrodes 3 on the substrate 2 correspond to the pattern openings 15a of the stencil plate 15. FIG.

After contact of the substrate 2 with the stencil plate 15, the control unit 19 carries out squeegeeing with the squeegees 44 so that paste on the stencil plate 15 is transferred to the substrate 2. FIG.

Specifically, this squeegeeing is performed by lowering one of the two squeegees 54 from the print head 16 and moving the base member 41 in the Y-axis direction while maintaining the state of abutment against the upper surface of the stencil plate 15 . This allows the squeegee 44 to slide on the stencil plate 15 so that paste on the stencil plate 15 is pushed into the pattern openings 15a by the squeegee 44 to be transferred onto the electrodes 3 of the substrate 2. FIG. The control unit 19 causes the squeegee 44 to rest against the stencil plate 15 on the rear side when squeegeeing with the print head 16 moving from front to back, whereas the control unit 19 causes the squeegee 44 on the front side against the stencil plate 15 is applied when squeegeeing is carried out with the print head 16, which is moved from the back to the front.

After transfer of the paste to the substrate 2 by the squeegee, the control unit 19 actuates the unit moving mechanism 12A to lower the substrate holding unit 12, allowing the substrate 2 and the pair of substrate holders 25 to separate from the stencil plate 15 for plate release. Consequently, paste remains on the electrodes of the substrate 2, with the result that paste is printed on the substrate 2. FIG.

After completion of the disc release, the control unit 19 stops holding the substrate 2 with the substrate holding unit 12. This stop of holding the substrate 2 is specifically carried out by opening the pair of substrate holders 25 by the mechanism control unit 19b and then lowering the lower receiving part 24, to lower both ends of the substrate 2 onto the pair of conveyors 22 .

Upon completion of holding the substrate 2, the mechanism control unit 19b operates the unit moving mechanism 12 to move the substrate holding unit 12 in the horizontal plane to adjust the orientation of the conveyors 22, and then operates the conveyors 22 and the substrate carry-out conveyors 13 to Out substrate 2 to the outside of the screen printing machine 1.

Referring to the 16 until 18 Next, the magazine 81 storing the plurality of stencil plates 15 will be described. 16 is a front view of the magazine and 17 Figure 12 is a plan view of the magazine with its top wall removed. 18(a) Fig. 14 is a perspective view of a main part of the interior of the magazine taken along arrows XIV of Figs 16 viewed in the direction of the arrows, and 18(b) is a side view of the magazine seen from its longitudinal section. The magazine 81 includes a guide part 82 that guides the stencil plate 15 in its inserting and leading-out direction, and a fixing part 83 that fixes the stencil plate 15 on the guide part 82 . The magazine 81 includes a top wall 81a, side walls 81b and 81c, a bottom wall 81d, a rear wall 81e, and an infeed and outfeed port 81f which takes in and out the stencil plate. The rear wall 81e is perpendicular to the taking-out direction of the stencil plate 15.

The guide part 82 includes a first guide plate 82a which is arranged on one side (left side) in the direction perpendicular to the in-and-out direction and which supports one edge of opposite edges of the stencil plate 15 directly. The guide part 82 includes a second guide plate 82b which is arranged on the other side (right side) in the direction perpendicular to the in-and-out direction and which supports the other edge of the opposite edges of the stencil plate 15 directly. The first guide plate 82a and the second guide plate 82b extend along the in-and-out direction of the stencil plate 15. A corresponding number of guide parts 82 each having the first guide plate 82a and the second guide plate 82b composing a pair of guide plates are in of the vertical direction in accordance with the number of the stencil sheet 15 stocked. The first guide plate 82a and the second guide plate 82b are fixed to the side walls 81b and 81c, respectively. The guide part 82 has an edge placed thereon in parallel to the taking-out direction of the stencil plates set in the magazine 81 . A pair of column plates 85 extending in the infeed and outfeed directions are fixed to the first guide plate 82a and the second guide plate 82b, respectively. The column plates 85 support a bottom surface of the stencil plate 15.

The fixing part 83 has a rectangular plate portion 83a extending in the taking-out direction of the stencil plate 15, and a V-bent portion 83b extending downward from a rear end of the plate portion 83b and then bent upward. The bent portion 83b is an elastic member such as a leaf spring. The plate portion 83a of the fixing member 83 is attached to the side wall 81b or 81c with screws.

The stencil plate 15 is inserted into the inside of the magazine 81 along the guide part 82, and when the back of the stencil plate 15 abuts against the rear wall 81e of the magazine 81, the bent portion 83b of the fixing part 83 is inserted into the holes 15b by an elastic force, which are formed on the stencil plate 15 along the direction of insertion and withdrawal of the stencil plate 15 . This allows the stencil plate 15 to be clamped by the rear wall 81e and the bent portion 83b inserted into the holes 15b to position the stencil plate 15 inside the magazine 81. The bent portion 83b may have a shape that simply extends downward from the rear end of the plate portion 83a other than the V-shape as long as it is an elastic member.

Next is on 19 referenced. 19 Fig. 14 is a perspective view of a main front portion inside the magazine. An end portion 82c of the guide member 82 opposite to the rear wall 81e has an inclined surface sloping downward. An end portion 85a of the column plate 85 opposite to the rear wall 81e has an inclined surface sloping downward. This can prevent the stencil plate 15 from being caught on the end of the guide part 82 and the end of the column plate 85 when the stencil plate 15 is inserted into the magazine 81 and when the stencil plate 15 is fed out of the magazine 81 to the outside.

The magazine 81 includes protruding portions 86 arranged along sides of the top wall 81a of the magazine 81, and recesses 87 corresponding to the protruding portions 86 arranged along sides of the bottom wall 81d of the magazine 81. Accordingly, when the user inserts the protruding portions 86 of one magazine 81 into the recesses 87 of another magazine 81, the other magazine 81 is secured to the one magazine 81. In this way, a plurality of magazines can be combined and coupled with each other, making it possible to reduce the weight of each magazine 81 and to reduce the load of the magazine 81 in transportation.

The screen printing machine 1 of the embodiment comprises: the magazine 81 stocking the plurality of stencil plates 15 each having the openings 15a corresponding to the electrodes 3 on the substrate 2; the plate holder 14 which detachably holds the edge of the stencil plate 15; the transport device 51 which transports the stencil plate 15 between the magazine 81 and the plate holder 14; and the print head 16, which transfers solder paste placed on the stencil board 15 held by the board holder 14. Since this configuration allows the stencil plates 15 with no frames attached to be stored in the magazine 81, it is possible to increase the storage capacity of the magazine 81 and further reduce the size of the magazine 81. The thickness of the conventional stencil frame is of the order of 30 mm and the thickness of the stencil plate 15 is of the order of 150 µm, thereby achieving a significant improvement. Since the conveying device 51 conveys the frameless stencil sheet 15 from the magazine 81 with the sheet holder 14 detachably holding the frameless stencil sheet 15, a space-saving screen printing machine 1 that can reduce the labor for exchanging the stencil sheet 15 can be provided.

The transporting device 51 can transport the stencil board 15 under the board holder 14 so that the stencil board 15 is attached to or detached from the bottom portion of the board holder 14 . So far, even if the stencil plate 15 has been attached to the side of the plate holder 14 that faces the print head 16, the stencil plate 15 is transported under the plate holder 14 to allow attachment/detachment between the plate holder 14 and the stencil plate 15 under the plate holder 14, with the result that interference with the print head 16 above the plate holder 14 can be avoided, which is suitable for automatic attachment/detachment.

The plate holder 14 can clamp the stencil plate 15 while tension is applied to the stencil plate 15 in the planar direction. Since this configuration applies stress to the stencil plate 15 in the planar direction, positional displacement between the electrodes 3 of the substrate 2 and the openings 15a of the stencil plate 15 can be prevented.

The elevators 71 may be arranged which moves the stencil plate 15 to the clamping position Pc at a lower level where the stencil plate 15 is clamped and to the waiting position Pw at a higher level. Since the plate holder 14 can be moved to the clamp position Pc and the waiting position Pw, the stencil plate 15 can be smoothly transported to the clamp position Pc without interfering with the plate holder 14.

The stencil plate 15 may have the plurality of holes 15b formed along the outer edge, while the plate holder 14 may include the plurality of projections 30a projecting downward from the bottom such that the plurality of projections 30a fit into the plurality of holes 15b of the stencil plate 15 are brought about by the movement of the plate holder 14 to the clamping position Pc by the lifters 71. This ensures proper engagement of the disc holder 14 with the s.

The plate holder 14 may include an actuator that moves the plurality of projections 30a outward in the planar direction to thereby apply tension to the stencil plate 15 . This enables the plate holder 14 to clamp the stencil plate 15 appropriately.

The actuator can be an air cylinder that works with compressed air pressure.

The actuator may further include the first air cylinders 35a that move the projections 30a inserted into the holes 15b formed on a pair of parallel outer edges of the stencil plate 15 outward in the planar direction; and the second air cylinders 35b which move the projections 30a inserted into the holes 15b formed on another pair of the outer edges outward in the planar direction perpendicular to the direction of movement caused by the first air cylinders 35a .

The screen printing machine 1 includes the plate holder driving part 36 which separately controls an air pressure supplied to the first air cylinders 35a and an air pressure supplied to the second air cylinders 35b. Since the first air cylinders 35a and the second air cylinders 35b each receive separately regulated compressed air pressures, the plate holder 14 can clamp the stencil plate 15 appropriately.

The transport device 51 of the embodiment comprises the holding part 53 which crosses the transport direction and which holds the stencil plate 15; the Y-axis carrier 59 which transports the stencil plate 15 in the transporting direction; and the pair of guide rails 55 supporting the stencil plate 15 transported by the Y-axis carrier 59 from below. This enables the frameless stencil plate 15 to be exchanged automatically.

The holding part 53 has the recesses 57 which suck the stencil plate 15 . This enables the holding part 53 to hold the stencil plate 15 more securely.

The holding part 53 holds a portion of the stencil plate 15 exposed between the pair of guide rails 55 from below, and the Y-axis bracket 59 includes the holding part elevating mechanism 54a which moves the holding part 53 vertically.

The holding part 53 has the upper surface 53s in contact with the underside of the stencil plate 15, and the pins 58 protruding upward from the upper surface and the recesses 57 open to the upper surface 53s around the underside of the stencil plate 15 to suck and hold.

The holding part 53 has at least two recesses 57 spaced apart in the transport direction, with the pins 58 being arranged between the two recesses 57 .

The support plate 56 is arranged to connect the end portions of the pair of guide rails 55 toward the attachment/detachment position Pa, with the front edge of the template plate 15 being supported on the support plate 56 at the attachment/detachment position Pa. By connecting the end portions of the guide rails 55 to each other via the support plate 56, the front side of the stencil plate 15 which has arrived at the attachment/detachment position Pa can ride on the support plate 56 and be supported by it. This enables attachment/detachment between the stencil board 15 and the board holder 14 to be stably performed.

The guide rails 55 may each have the holes 55c for avoiding interference with the downward projections 30a of the disc holder 14. This allows the projections 30a of the board holder 14 to pass through the holes 15b of the stencil board 15 to reach the holes 55c of the guide rails 55, thereby making it possible to prevent the projections 30a of the board holder 14 from detaching from the holes 15b of the template plate 15.

According to the magazine 81 of the embodiment, the magazine 81 stocking the plurality of stencil sheets in Fig. 15 includes the guide part 82 which guides the stencil plate 15 in the direction of insertion and ejection; As a result, the fixing part 83 fixes the stencil plate 15 to the guide part 82 even if the stencil plate 15 is frameless, making it possible to prevent the stencil plate 15 in the magazine 81 from moving.

The fixing part 83 can fix the stencil plate 15 by pressing it against the first guide plate 82a and the second guide plate 82b. Since the fixing part 83 presses the stencil plate 15 against the guide part 82, the stencil plate 15 can be prevented from moving within the magazine 81.

The magazine 81 includes the loading and unloading port 81f that takes the stencil plate 15 in and out, and the rear wall 81e that is located at the rear of the loading and unloading port 81f, and the fixing part 83 has the bent portion 83b that has a is an elastic member that is inserted into the holes 15b formed on the template plate 15 along the insertion and withdrawal direction of the template plate 15 so that the template plate 15 is separated from the mounting portion 83 inserted into the holes 15b from the rear wall 81e and the bent portion 83b. This allows the stencil plate 15 stored in the magazine 81 to be positioned, making the magazine 81 suitable as a magazine for automatically exchanging the stencil plate 15.

The end portion 82c of the guide member 82 opposite to the rear wall 81e may have the inclined surface sloping downward. This can prevent the stencil plate 15 from being caught on the end portion 82c of the guide member 82 when the stencil plate 15 is carried in and out.

A large number of magazines 81 can be coupled to one another. This makes it possible to reduce the weight of each magazine 81 and reduce the load for transporting the magazine 81.

The magazine 81 includes the protruding portions 86 arranged along sides of the top wall 81a of the magazine 81 and recesses 87 in correspondence with the protruding portions 86 arranged along sides of the bottom wall 81c of the magazine 81, the protruding Sections 86 of one magazine 81 are inserted into the recesses 87 of another magazine 81 so that the other magazine 81 is secured to one magazine 81. This enables the plurality of magazines to be mounted together vertically stably.

Although, in the above embodiment, the cylinders (driving cylinders 35) have been shown as a driving part which imparts tension to the stencil plate 15 by driving the four coupling members 30 to move opposite ends of the four coupling members 30 in the direction relatively away from each other, the driving part does not necessarily have to be the cylinders.

Although in the above embodiment, the means for coupling the edges along the four sides of the stencil plate 15 and the four coupling members 30 to each other have been formed of the coupling holes 15b located on the edges of the stencil plate 15 and the coupling projections 30a provided on each of the coupling members 30 are arranged to fit in the coupling holes 15, this is not limiting. The edges of the stencil plate 15 and the four coupling elements 30 can be coupled together by other means. For example, the stencil plate 15 may have bent portions on its four sides that are bent inward, while the plate holder 14 may have claws that detachably engage the bent portions of the stencil plate 15 . As described above, the coupling members 30 and the stencil plate 15 are coupled with each other by fitting the coupling projections 30a arranged on each of the coupling members 30 into the holes 15b arranged on the edges of the stencil plate 15, thereby coupling between the coupling members 30 and the stencil plate 15 can be implemented by a very simple configuration, resulting in cost reduction of the screen printing machine 1.

Although the present disclosure has been fully described in terms of the preferred embodiment with reference to the accompanying drawings, it is obvious for those skilled in the art to make various changes and modifications. Such changes and modifications should be understood as being included within the scope of the present disclosure, which is defined by the appended claims, unless they depart therefrom. Changes in the combination and order of elements in each embodiment can be made without departing from the scope and spirit of the present disclosure.

By suitably combining any embodiment or variant of the different n embodiments and variants, their respective effects can be achieved.

Industrial Applicability

The screen printing machine according to the present disclosure can be applied to a screen printer using frameless stencil plates.

Reference List

1

screen printing machine

2

substrate

3

electrode

8th

insertion entrance

9

exit exit

10

Base

11

Substrate infeed conveyor

12

substrate holding unit

13

Substrate Outfeed Conveyor

14

plate holder

14a

holder frame

14a

Hole

15

stencil plate

15a

opening

15b

Hole

16

printhead

17a

down-facing camera

17b

up-facing camera

19

control unit

19a

image recognition unit

19b

mechanism control unit

19c

voltage control unit

19d

Storage

21

unit base

22

conveyor

23

lifting cylinder

25

substrate holder

30

coupling element

30a

head Start

31

first coupling element

32

second coupling element

35a

first air cylinder

35b

second air cylinder

44

squeegee

51

transport device

53

holding part

54a

Bracket Lift Mechanism

55

guide rail

55a

horizontal section

55b

wall section

55c

hole (recess part)

56

carrying plate

57

recess

57a

intake hole

58

Pen

59

Y axis carrier

61

suction device

71

lifting device

81

magazine

81a

top wall

81b, 81c

Side wall

81d

bottom wall

81e

back panel

82

guide part

82a

first guide plate

82b

second guide plate

82c

end section

83

fastening part

83a

plate section

83b

curved section

85

column plate

85a

end section

86

preceding section

87

recess

91

Magazine lifting device

father

Attachment/removal position

personal

clamping position

pw

waiting position

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• JP2013159022A [0004]
• JP2013111847A [0004]

Claims (15)

Screen printing machine comprising: a magazine stocking a stencil plate having openings associated with electrodes disposed on a substrate; a plate holder that detachably holds edges of the stencil plate; a transport device that transports the stencil plate between the magazine and the plate holder; and a print head that fills paste placed on the stencil plate held by the plate holder into the openings. The screen printing machine after claim 1 wherein the transport device transports the stencil board under the board holder, and the board holder attaches or detaches the stencil board to a bottom portion of the board holder. The screen printing machine after claim 1 or 2 , wherein the plate holder clamps the stencil plate while applying tension to the stencil plate in a planar direction. The screen printing machine after claim 2 or 3 comprising: an elevating device that moves the plate holder to a clamping position at a lower level where the stencil plate is clamped and to a waiting position at a higher level. The screen printing machine after claim 4 wherein the stencil plate has a plurality of holes formed along its outer edge, and wherein the plate holder has a plurality of projections which project downward, the plurality of projections into the plurality of holes of the stencil plate as a result of movement of the plate holder the clamping position brought about by the lifting device. The screen printing machine after claim 5 wherein the plate holder includes an actuator that moves the plurality of projections outward in a planar direction to thereby apply tension to the stencil plate. The screen printing machine after claim 6 , where the actuator is an air cylinder that works with compressed air pressure. The screen printing machine after claim 6 wherein the actuator comprises: a first air cylinder that moves the protrusions inserted into the holes formed on a pair of parallel outer edges of the stencil plate outward in the planar direction; and a second air cylinder that moves the protrusions inserted into the holes formed on another pair of the outer edges outward in the planar direction perpendicular to the moving direction caused by the first air cylinder. The screen printing machine after claim 8 comprising: a disc holder driving part that separately regulates an air pressure supplied to the first air cylinder and an air pressure supplied to the second air cylinder. The screen printing machine according to one of Claims 1 until 9 wherein the transporting device comprises: a moving body including a holding part, the holding part crossing a transporting direction and holding the stencil board, the moving body transporting the stencil board in the transporting direction; and a pair of guide rails arranged along the transporting direction of the stencil board, the pair of guide rails supporting the stencil board transported by the moving body from below. The screen printing machine after claim 10 , wherein the holding part includes a suction part that sucks the stencil plate. The screen printing machine after claim 11 wherein the holding part holds a portion of the stencil plate exposed between the pair of guide rails from below, and the moving body includes a vertical driving part that vertically moves the holding part. The screen printing machine after claim 12 wherein the holding part comprises: an upper surface in contact with an underside of the stencil plate; and a pin protruding upward from the top surface, and wherein the suction part opens to the top surface to suck and hold the underside of the stencil plate. The screen printing machine after Claim 13 wherein the holding part comprises at least two of the suction parts arranged spaced from each other in the transporting direction with the pin interposed between the two suction parts. The screen printing machine according to one of Claims 1 until 14 wherein the guide rails include a recess portion to avoid interference with the projections projecting downward from the disc holder.

Images