JP5536438B2 - Screen printing device - Google Patents

Description

  The present invention relates to a screen printing apparatus for printing cream solder, conductive paste, or the like on a substrate as a pretreatment for mounting a component on a substrate such as a printed wiring board (PWB).

  A screen printing device is built into a printed circuit board (PCB) production line, prints conductive paste on the substrate conveyed from the upstream side, and sends it to the component mounting device on the downstream side. is there.

  This type of screen printing apparatus is configured, for example, as disclosed in Patent Document 1, to receive a substrate one by one with respect to a printing unit, perform a printing process, and send the printed substrate to a component mounting apparatus. Has been. In recent years, for example, as disclosed in Patent Document 2, two printing units are provided in parallel in the apparatus, and printing is performed while receiving a substrate from each upstream to each printing unit, and individually downstream. Something to send out has also been developed. This is because a so-called dual transport type component mounting apparatus has been used which has two substrate transport lines in one apparatus and simultaneously advances (parallel) component mounting in each transport line. The aim is to improve the efficiency of printing and component mounting by connecting the screen printing device and the component mounting device.

Japanese Patent No. 2682145 JP 2009-70867 A

  In the screen printing apparatus, in order to prevent the misalignment between the substrate and the screen mask, the substrate carried on the substrate table is fixed by a clamping device or the like below the printing execution position or in the vicinity of the mask. A position shift is detected by image recognition, and the position of the substrate table is corrected when the substrate is placed on the mask at the print execution position. In this case, the lower part of the mask is a space where the substrate rises due to heavy loading, and it is difficult to place the camera in a fixed manner. After loading the substrate on the table, move the clamped substrate from the lower position of the mask to the camera position to take an image of the substrate, move the substrate to the print execution position again, load it back on the mask and perform printing. It is configured. Further, in Patent Document 2, a movable camera is provided, and this camera is temporarily interposed at a position between the substrate clamped at the printing execution position and the mask, and the substrate is imaged. It is configured to retract to the mask side position.

  However, in any case, since the substrate and the camera are moved between the mask lower position and the mask side position after the substrate is loaded, it takes a relatively long time to recognize the substrate. Therefore, this is one of the factors that hinder the improvement of throughput (reduction of tact time) in the printing press.

  Further, in the screen printing apparatus of Patent Document 2, the substrate carry-in portion and the substrate carry-out portion are offset in a direction (Y-axis direction) orthogonal to the substrate transport direction (X-axis direction), for supporting and fixing the substrate. The stage is configured to move in the Y-axis direction. This is because the two board transfer lines on the component mounting apparatus side are arranged close to each other, so that the board carry-out portions can be connected to each other. This is because they need to be close.

  However, in this apparatus, the substrate is received on the stage at a position (receiving position) corresponding to the substrate carry-in section, and after printing, the stage is moved to a position (feeding position) corresponding to the substrate carry-out section to carry out the substrate. During the unloading of the substrate, it is impossible to receive the subsequent substrate on the stage. Therefore, this point is also an obstacle to improving the throughput.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a screen printing apparatus capable of improving the throughput.

The present invention for solving the above-described problems is provided in a screen printing apparatus, which includes a print execution unit that includes a screen mask and performs screen printing on a substrate, and a position on one side in a specific direction across the print execution unit. A substrate carry-in portion and a substrate carry-out portion provided at a position offset to an orthogonal direction perpendicular to the specific direction with respect to the substrate carry-in portion, and a substrate carried from the substrate carry-in portion. The substrate is received at a specific position on the substrate carry-in unit side relative to the print execution position where printing by the print execution unit is possible, and the substrate is held in a state where printing by the print execution unit is possible in advance. a transport holding means for holding the substrate during the printing is transported to the printing execution position the substrate from the specific position by moving in a particular direction, During serial printing unit from the specific position but before printing by the substrate due to the transport retaining means to the printing execution position conveying the board imaging means for imaging the substrate held on the transport retaining means, said A transport unit that is provided separately from the transport holding unit, transports the substrate loaded from the substrate carry-in unit to the specific position, waits, and receives the printed substrate from the transport holding unit and transports it to the substrate unloading unit. A receiving position on which the transport holding means and the transport means are mounted so that a substrate carried in from the substrate carry-in portion can be received, and a sending position where a printed substrate can be sent out to the substrate carry-out portion And a standby space for waiting the subsequent substrate at a predetermined position on the substrate carry-in portion side in the specific direction. A movable table for the transport retaining means, and control means for controlling said conveying means and said movable table, the print execution unit, the print execution position in a state in which the movable table is placed on the receiving position It is provided at a position where printing can be performed on the substrate to be arranged, and the control means sets the standby space on the movable table as the specific position and the substrate carry-out portion in the specific direction on the movable table. With the predetermined position on the side as the print execution position, the transfer holding unit transfers the preceding substrate after printing to the transfer unit, and then moves from the print execution position to arrive at the specific position. The means conveys the subsequent substrate to the specific position and waits, and the conveyance holding means receives and holds the subsequent substrate at the specific position. The transport means finishes transporting the preceding substrate downstream from the print execution position before moving from a specific position and arrives at the print execution position. By moving the table from the receiving position to the sending position and carrying the preceding substrate by the carrying means, the preceding substrate is sent from the movable table to the substrate carry-out section, and after the sending, the movable table is moved to the sending position. To the receiving position, and during the movement, the movable table and the movable table so that the mark on the succeeding board conveyed from the specific position to the printing execution position passes through the imaging position by the board imaging means. a shall moving the carrier holder means.

In this screen printing apparatus, the substrate carried in from the substrate carry-in unit is received on the movable table arranged at the receiving position, and the print execution unit is held in the state of being held by the conveyance holding means mounted on the movable table. Printing is performed by the above. After printing, the printed table is sent out to the substrate carry-out section by placing the movable table at the sending position. Then, after the preceding substrate is sent out, while the movable table moves from the sending position to the receiving position, the succeeding substrate is printed by the print execution unit in advance at a specific position closer to the substrate carry-in portion than the print execution position. Is held in a state where it can be performed, and then conveyed from the specific position to the print execution position. Then, during the transfer of the substrate (subsequent substrate) from the specific position to the print execution position, the sign of the substrate is imaged by the substrate imaging means. According to such a screen printing apparatus, an independent process for imaging the substrate is not required, the movable table is moved from the sending position to the receiving position, the substrate is transported to the printing execution position, and the substrate (marker) is moved. An imaging are performed in parallel. Therefore, a conventional device that requires an independent process for imaging the substrate, for example, once the substrate is carried into the printing execution position and fixed by the clamping device, etc., then the substrate is clamped at the imaging position on the side of the printing execution position, etc. In addition, the tact time can be effectively shortened as compared with an apparatus that images the substrate by moving it together.

  In this configuration, the control unit is configured such that the subsequent substrate held by the transport holding unit is moved to the print execution position when the movable table reaches the receiving position after the preceding substrate is sent to the substrate carry-out unit. The movable table and the conveyance holding means are controlled so as to be arranged in the position.

  According to this configuration, after the movable table is reset from the sending position to the receiving position, printing of the substrate by the printing execution unit can be started immediately, which is advantageous in reducing the tact time.

  In each of the above-described screen printing apparatuses, the substrate imaging unit may be provided so as to be movable in a direction orthogonal to the conveyance direction of the subsequent substrate by the conveyance holding unit.

  According to this configuration, the imaging area is expanded by moving the board imaging means in the same direction, and the degree of freedom of the imaging position on the board is increased.

  The transport holding means includes a substrate holding member for holding a substrate and a moving means for moving the substrate holding member between the specific position and the printing execution position, and a mask for imaging the screen mask on the substrate holding member. An imaging unit may be mounted.

  According to this configuration, the mask can be imaged by the mask recognition camera while the substrate is being transported from the specific position to the print execution position. In addition, a rational configuration that also serves as a substrate holding member as means for moving the mask recognition camera is achieved.

  According to the screen printing apparatus of the present invention as described above, since the conveyance of the substrate to the printing execution position and the imaging of the substrate can be performed in parallel, a conventional process that requires an independent process for imaging the substrate is required. Compared with the apparatus, the tact time can be shortened by the fact that an independent substrate imaging process is not required. Therefore, it is possible to improve the throughput and contribute to the productivity improvement of the printed circuit board.

1 is a plan view showing a first embodiment of a screen printing apparatus according to the present invention. It is a front view which shows a screen printing apparatus. It is a top view (plan view of the state where a printing execution part etc. were removed from a screen printing device) which shows a substrate support table built in a screen printing device, its drive mechanism, etc. It is sectional drawing (IV-IV sectional view taken on the line of FIG. 3) of the screen printing apparatus which shows the structure of a board | substrate support table. It is a principal part enlarged view of the clamp unit in FIG. 4 ((a) is a board | substrate unclamped state, (b) is a board | substrate clamp state). It is a perspective view which shows the printing execution part etc. which are integrated in a screen printing apparatus. It is a top view which shows a printing execution part. It is a perspective view which shows the mask holding mechanism which hold | maintains a screen mask. It is a plane schematic diagram of the said mask holding mechanism for demonstrating the rotation drive mechanism and Y-axis drive mechanism incorporated in a mask holding mechanism ((a) is before mask rotation, (b) shows the state after mask rotation, respectively. ). FIG. 2 is a schematic plan view for explaining a printing operation of a screen printing apparatus based on control by a control device ((a) and (b) show the printing operation in time series). FIG. 2 is a schematic plan view for explaining a printing operation of a screen printing apparatus based on control by a control device ((a) and (b) show the printing operation in time series). It is process drawing which compared operation | movement (figure (a)) of the screen printing apparatus which concerns on this invention, and operation | movement (figure (b)) of a conventional apparatus. It is a plane schematic diagram which shows 2nd Embodiment of the screen printing apparatus which concerns on this invention ((a), (b) has shown the printing operation in time series). It is a plane schematic diagram explaining the printing operation of the screen printing apparatus according to the second embodiment based on the control by the control device ((a) to (c) shows the printing operation in time series). FIG. 6 is a schematic plan view showing a third embodiment of a screen printing apparatus according to the present invention ((a) and (b) show printing operations in time series).

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 show a first embodiment of a screen printing apparatus according to the present invention. FIG. 1 is a plan view and FIG. 2 is a front view schematically showing the screen printing apparatus.

  This screen printing apparatus 1 is incorporated in a printed circuit board (PCB) production line in a state in which a dual transport type component mounting apparatus M is connected to the downstream side thereof. In the illustrated example, a screen printing apparatus 1 (hereinafter abbreviated as a printing apparatus 1) includes two loaders L1 and L2 (referred to as a first loader L1 and a second loader L2) arranged in parallel and a dual transport type 1 It is interposed between the component mounting apparatuses M of the base, performs printing on the substrate W fed out from each of the upstream loaders L1 and L2, and sends it out to the component mounting apparatus M on the downstream side.

  In the following description, the transport direction of the substrate W in the production line is the X-axis direction, the direction orthogonal to the X-axis direction on the horizontal plane is the Y-axis direction, and the phrase (vertical) is orthogonal to both the X-axis and Y-axis directions. The printing apparatus 1 will be described with the (direction) as the Z-axis direction.

  The printing apparatus 1 has two substrate carry-in portions En1 and En2 (referred to as a first substrate carry-in portion En1 and a second substrate carry-in portion En2) at one end portion in the X-axis direction (upstream end portion in the substrate transport direction). On the other hand, the two substrate carry-out portions Ex1 and Ex2 (referred to as the first substrate carry-out portion En1 and the second substrate carry-out portion En2) corresponding to these are disposed at the other end (the end on the downstream side in the substrate carrying direction). The board W fed out from the first loader L1 is carried into the apparatus from the first board carry-in part En1 and printing is performed, and the printed board W is mounted from the first board carry-out part Ex1 to the component mounting apparatus. On the other hand, the substrate W fed out from the second loader L2 is carried into the apparatus from the second substrate carry-in portion En2 and printed, and the printed substrate W is transferred from the second substrate carry-out portion Ex2 to the component. Unload to mounting device MEach board carry-out part Ex1, Ex2 is offset to a position inside the board carry-in parts En1, En2 in the Y-axis direction so as to correspond to two board carrying lines of the component mounting apparatus M. In the figure, reference numerals CL1, CL2, CM1, and CM2 denote a pair of belt conveyors that are mounted on the loaders L1 and L2 and the component mounting apparatus M, respectively, and constitute a board conveyance line, and the board W is the belt conveyor pair CL1, It is conveyed along CL2, CM1, and CM2 (hereinafter abbreviated as conveyor pairs CL1, CL2, CM1, and CM2).

  The printing apparatus 1 has two substrate support tables 10A and 10B for supporting the substrate W on the base 2 and the substrate support tables 10A and 10B stopped at predetermined positions in the Y-axis direction. Two printing execution units 20A and 20B that individually perform printing on the substrates W supported by the support tables 10A and 10B are provided.

  Substrate support tables 10A and 10B (referred to as the first substrate support table 10A and the second substrate support table 10B; respectively corresponding to the movable tables of the present invention) receive the substrates W carried from the substrate carry-in portions En1 and En2. The printed board W is supported so that printing is possible and the printed board W is sent out from the board carry-out parts Ex1 and Ex2. Among these, the first board support table 10A is carried in from the first board carry-in part En1. The substrate W is received and supported by the first print execution unit 20A so that printing can be performed. On the other hand, the second substrate support table 10B receives the substrate W carried in from the second substrate carry-in unit En2. Then, the substrate W is supported so that printing can be performed by the second printing execution unit 20B.

  As shown in FIG. 3, each of the substrate support tables 10A and 10B has a substantially rectangular shape that is elongated in the X-axis direction in plan view, and is configured to move individually in the Y-axis direction by a table driving mechanism. ing. The table drive mechanism is constituted by a screw feed mechanism. That is, the substrate support tables 10A and 10B are movably supported on a common fixed rail 3 provided on the base 2 and extending in the Y-axis direction. The motors 4A are respectively connected via screw shafts 5A and 5B. 4B. Then, based on motor control by the control device to be described later, the first substrate support table 10A can receive the substrate W carried in from the first substrate carry-in section En1 (the position shown in FIGS. 1 and 3) and the substrate. A receiving position where the second substrate support table 10B can receive the substrate W carried in from the second substrate carrying-in portion En2 while moving W between the sending position where the W can be sent to the first substrate carrying-out portion Ex1. (Position shown in FIGS. 1 and 3) and a delivery position where the substrate W can be delivered to the second substrate carry-out part Ex2.

  Each of the substrate support tables 10A and 10B includes a conveyor pair 12 extending in the X-axis direction, a clamp unit 14 that holds the substrate W on the conveyor pair 12 in a state where printing by the print execution units 20A and 20B is possible, A clamp unit drive mechanism for moving the clamp unit 14 in the X-axis direction along the conveyor pair 12 and a cleaning unit 18 for cleaning the screen mask 21 described later are provided. In the present embodiment, the clamp unit 14 (substrate holding means) and the clamp unit driving mechanism (moving means) correspond to the transport holding means in the present invention, and the conveyor pair 12 corresponds to the transport means in the present invention.

  The conveyor pair 12 is composed of a belt conveyor, receives the substrate W carried in from the substrate carry-in portions En1 and En2, and transports the substrate W to the post-substrate standby position P1 and prints the substrate W from the post-print execution position P2 to the substrate carry-out portion Ex1. , Ex2 is conveyed.

  The conveyor pair 12 conveys the substrate W in the X-axis direction along with the movement of the belt W while supporting both end portions in the Y-axis direction of the substrate W by the belt 121 that moves around by the motor drive (see FIG. 5A). ). The conveyor on one side of the two conveyors constituting the conveyor pair 12 is a fixed conveyor fixedly supported on the substrate support tables 10A and 10B via struts, and the conveyor on the other side is the conveyor on the one side. The movable conveyor is supported by the substrate support tables 10A and 10B so as to be able to contact and separate (movable in the Y-axis direction) and is driven by an actuator such as a motor. In other words, the conveyor pair 12 is a variable stroke type conveyor that can change the interval according to the size of the substrate W.

  In the present embodiment, the first substrate support table 10A located on the front side of the apparatus (the lower side of FIGS. 1 and 3) is such that the rear side of the conveyor pair 12 is a fixed conveyor and the front side is a movable conveyor. On the other hand, the second substrate support table 10B located at the rear side of the apparatus can be changed with reference to the rear conveyor, and the front side of the pair of conveyors 12 is a fixed conveyor and the rear side is a movable conveyor. The interval can be changed based on the conveyor.

  The clamp unit 14 includes a base member 140 (shown in FIG. 4) supported so as to be movable in the X-axis direction along fixed rails 141 provided on the substrate support tables 10 </ b> A and 10 </ b> B. A backup mechanism for lifting and supporting the substrate W from the conveyor pair 12 and a clamp mechanism for fixing the substrate W lifted by the backup mechanism are provided.

  As shown in FIG. 4 and FIG. 5A, the backup mechanism includes a plurality of backup pins 151 (hereinafter abbreviated as pins 151) in a predetermined arrangement and is moved up and down on the base member 140 via a link mechanism or the like. A backup table 150 (referred to as a BU table 150) that is supported and a driving motor 152 and the like are included. By driving the motor 152, the BU table 150 is moved to a predetermined retracted position and an operating position raised from this position. It is configured to be displaced. Here, the retracted position is a position where the tip position of the pin 151 is lower than the lower surface of the substrate W supported by the conveyor pair 12 (belt 121) (position shown in FIG. 5A), and the operating position is the same. This is a position where the tip position of the pin 151 is higher than the lower surface of the substrate W. Therefore, this backup mechanism lifts the substrate W from the conveyor pair 12 when the BU table 150 is placed in the operating position, as shown in FIG.

  The clamp mechanism includes a pair of clamp members 160 disposed above the conveyor pair 12 and extending parallel to each other in the X-axis direction, an arm member 161 to which the clamp members 160 are assembled, and an actuator for driving the clamp members, for example, And a two-way type air cylinder 162. One of the clamp members 160 (on the left side in FIGS. 4 and 5A) is assembled so as to be displaceable in the Y-axis direction with respect to the arm member 161, and is driven by the air cylinder 162. It is displaced to the retracted position shown in FIG. 5 and the forward position shown in FIG. That is, as shown in FIG. 4B, the clamp mechanism moves the substrate W lifted by the back-up mechanism by moving the clamp member 160 on one side from the retracted position to the advanced position. At the same time, it is sandwiched in the Y-axis direction and clamped.

  In the printing apparatus 1, printing is performed by overlapping the screen mask 21 described later on the substrate W that is lifted from the conveyor pair 12 by the clamp unit 14 and clamped by the clamp member 160 as described above. Therefore, the clamp unit 14 is configured to release the substrate from the conveyor pair 12 and hold it in a state where printing by the print execution units 20A and 20B is possible.

  Each arm member 161 of the clamp mechanism is formed so as to hold the conveyor pair 12 from the outside (outside in the Y-axis direction), and then slides on the X-axis direction fixed rail 122 assembled to each conveyor pair 12. Connected as possible. In this way, each arm member 161 is configured to be guided by being connected to the conveyor pair 12 (fixed rail 122), so that the clamp unit 14 is moved in the X-axis direction by the clamp unit driving mechanism. The relative position of the conveyor pair 12 and each clamp member 160 in the Y-axis direction is kept constant.

  Also, one arm member 161 of each arm member 161, specifically, the arm member 161 (the right arm member in FIG. 4) connected to the fixed conveyor of the conveyor pair 12 is fixed to the base member 140, The arm member 161 on the side connected to the movable conveyor (left arm member in FIG. 4) is supported along the fixed rail 164 provided on the base member 140 so as to be displaceable in the Y-axis direction. Therefore, when the distance between the conveyor pair 12 is changed, the arm member 161 on one side moves together with the movable conveyor in the Y-axis direction, whereby the distance between both the clamp members 160 is automatically adjusted. That is, the interval between the clamp members 160 is automatically changed to an interval at which the substrate W transported after changing the interval between the conveyor pairs 12 can be clamped. Each of the clamp members 160 is configured such that the one assembled on the movable conveyor side among them is driven. With this configuration, the substrate W is clamped with reference to the fixed conveyor side. ing. Accordingly, in the clamp unit 14 of the first substrate support table 10A, the substrate W is clamped with reference to the rear side of the apparatus, and in the clamp unit 14 of the second substrate support table 10B, the substrate W is clamped with reference to the front side of the apparatus.

  The clamp unit drive mechanism is constituted by a screw feed mechanism. That is, the base member 140 of the clamp unit 14 is movably supported on a fixed rail 141 provided on the base 2 and extending in the X-axis direction, and is driven by the motor 144 via the screw shaft 142. It is configured.

  Here, as shown in FIG. 3, each of the substrate support tables 10A and 10B is provided with a standby space for the substrate W on the substrate carry-in portion En1 and En2 side, and this position is the substrate standby position P1 (the specific position of the present invention). The predetermined position on the downstream side of this is the print execution position P2, and the clamp unit 14 moves between the substrate standby position P1 and the print execution position P2 on the basis of the motor control by the control device described later. And it moves along the fixed rail 141. In association with the movement of the clamp unit 14, the drive of the BU table 150 and the clamp member 160 is controlled by the control device. That is, after the clamp unit 14 is moved to the substrate standby position P1, the substrate W is lifted from the conveyor pair 12 and clamped by the clamp member 160, so that the substrate W can be printed by the print execution units 20A and 20B. As the clamp unit 14 moves, it is transported to the print execution position P2, and after printing, the substrate W is received on the conveyor pair 12 from the clamp unit 14 by releasing the holding state of the substrate W at the print execution position P2. It is supposed to be passed. In the following description, for convenience, the state in which the substrate W is held by the clamp unit 14 as described above (the state in which the substrate W is lifted from the conveyor pair 12 and clamped by the clamp member 160) is simply referred to as a clamped state, and the holding is released. This state is referred to as a clamp release state.

  2, 4 and 5, only the clamp unit 14 of the first substrate support table 10A is shown, but the configuration of the second substrate support table 10B is also basic except that the substrate W is clamped on the front side of the apparatus. Is common to the first substrate support table 10A.

  Although not shown in detail, the cleaning unit 18 includes a cleaning head including a pad that can be slidably contacted with the lower surface of a screen mask 21 described later, a suction nozzle that sucks the screen mask 21 through the pad, and the like. When the substrate support tables 10A and 10B move in the Y-axis direction, the cleaning head is brought into sliding contact with the lower surface of the screen mask 21 to remove the paste accumulated on the lower surface of the mask and the pattern holes.

  The cleaning head is configured to be movable up and down with respect to the substrate support tables 10A and 10B. The cleaning head is disposed at an operating position where the cleaning head can be slidably contacted with the screen mask 21 only at the time of cleaning. It is configured to be arranged.

  Reference numeral 15 in FIGS. 1 to 3 denotes a stopper mechanism provided in the conveyor pair 12, and the substrate carry-in portion En1 in a state where the clamp unit 14 is located on the print execution position P2 side from the substrate standby position P1. , En2 is for stopping the substrate W received on the conveyor pair 12 and transported by the operation of the conveyor pair 12 at the substrate standby position P1, and waiting at that position. This stopper mechanism 15 has a stopper shaft that is driven back and forth by an actuator such as an air cylinder, for example, and restricts the movement of the substrate W by advancing the stopper shaft into the transport path of the substrate W by the conveyor pair 12. It is configured to be switchable between an operating state and a stopped state in which the stopper shaft is retracted out of the conveyance path and the movement of the substrate W is allowed. That is, the stopper mechanism 15 receives the printed substrate W from the clamp unit 14 onto the conveyor pair 12 and moves the substrate support table 10A (or 10B) to the delivery position. When the substrate W at the substrate standby position P1 is lifted from the conveyor pair 12 by the clamp unit 14 when unloading from the print execution position P2 through the substrate unloading section Ex1 (or Ex2), the stopper mechanism 15 The substrate W can be maintained and waited at the substrate standby position P1 against the operation.

  Further, reference numeral 16 in the figure denotes a mask recognition camera mounted on the clamp unit 14. The mask recognizing camera 16 is a camera having a CCD area sensor or the like, and a mark such as a mark or a symbol written on the lower surface of the screen mask to recognize the relative position between the screen mask 21 and the substrate W, which will be described later. The image is taken from.

  Print execution units 20A and 20B (first print execution units 20A, 20B) are located above the substrate support tables 10A and 10B, more specifically at positions above the print execution position P2 in the substrate support tables 10A and 10B arranged at the receiving positions. 2nd printing execution part 20B) is provided.

  FIG. 6 is a perspective view showing only the print execution units 20 </ b> A and 20 </ b> B extracted from the printing apparatus 1. Each of the print execution units 20A and 20B is provided in the Y-axis direction, and is provided with a mask holding mechanism for holding the mask 21, a squeegee unit 40 provided in the X-axis direction, and a Y-axis direction, And a squeegee driving mechanism for moving the squeegee unit 40 in the Y-axis direction. The mechanisms and the like constituting the print execution units 20A and 20B are installed on the base 2 at a predetermined interval in the X-axis direction, and move from the first substrate carry-in unit En1 to the first receiving position. The substrate W that moves from the substrate carry-in portion En2 to the second receiving position and the substrate that moves from the send-out position to the substrate carry-out portion Ex are assembled in a pair of device frames 6 each formed in a gate shape so as to straddle the Y-axis direction. It is attached.

  As shown in FIGS. 6 to 8, each mask holding mechanism includes a rectangular mask fixing member 22 in which a screen mask 21 (hereinafter abbreviated as “mask 21”) is detachably attached, and raises and lowers the mask fixing member 22. An elevating drive mechanism, a rotation driving mechanism for rotating the fixing member 22 together with the elevating drive mechanism about the Z axis, and a Y axis driving mechanism for moving the fixing member 22 along the Y axis direction together with the elevating drive mechanism Including.

  As shown in FIGS. 7 and 8, the mask fixing member 22 has a rectangular shape in which an opening 22a for printing is formed at the center, and the mask 21 assembled in advance in the frame body is the frame body. In addition, the mask fixing member 22 is fixed so as to close the opening 22a.

  Each drive mechanism of the mask fixing member 22 has the following configuration.

  Each apparatus frame 6 is provided with a fixed rail 25 extending in the Y-axis direction, and a mask support member 24 for supporting the mask fixing member 22 so as to be movable up and down is movably supported by these fixed rails 25. Specifically, the mask support member 24 has a U-shaped shape in a plan view including a pair of Y-axis plate portions 24 a extending along the fixed rail 25 and an X-axis plate portion 24 b connecting the one end portions thereof. The Y-axis plate portions 24a are connected to the sliders 26a to 26c attached to the fixed rails 25, so that they can move in the Y-axis direction.

  As shown in FIG. 8, a pair of guide shafts 251 extending in the Z-axis direction pass through each Y-axis plate portion 24 a of the mask support member 24, and the mask fixing member 22 is provided at the lower end of these guide shafts 251. Is fixed, and a connecting member 252 is fixed to the upper end. Each Y-axis plate portion 24a of the mask support member 24 has a pair of pulley-integrated nuts 256 assembled at a position between both guide shafts 251 so as to be rotatable and fixed in the Z-axis direction. Each screw shaft 254 is screwed into the Z-axis direction with respect to 256, and both ends of the screw shaft 254 are fixedly supported by the mask fixing member 22 and the connecting member 252. A motor 260 is fixed to the mask support member 24, and a drive pulley (not shown) is mounted on the output shaft of the motor 260. The drive pulley and a plurality of idle pulleys 257 assembled to the mask support member 24 are provided. A drive belt 258 is mounted across the pulley integrated nut 256.

  With this configuration, when the motor 260 is driven, the rotation is transmitted to the pulley integrated nut 256 via the drive belt 258 to rotate the pulley integrated nut 256, and the screw shaft 254 is axially moved along with this rotation. As a result, the mask fixing member 22 fixed to the screw shaft 254 moves in the vertical direction (Z-axis direction) while being guided by the guide shaft 251 as indicated by an arrow in FIG. At the time of printing, the mask 21 is clamped by the clamp unit 14 while being lifted from the substrate W supported by the substrate support tables 10A and 10B, specifically the conveyor pair 12, by the control of the motor 260 by the control device described later. So as to be displaced between the overlapping height position (the position indicated by the two-dot chain line in FIG. 8) and the retracted position (the position indicated by the solid line in FIG. 8) above this height position. It has become.

  The mask support member 24 is connected to the sliders 26a to 26c mounted on the fixed rails 25 as described above. Specifically, the mask support member 24 is allowed to be displaced around the Z axis with a specific position as a fulcrum. As described above, the Y-axis plate portions 24a are connected to the sliders 26a to 26c through the link members 28a to 28c. FIG. 9A is a diagram schematically showing the mask support member 24 and the like in order to facilitate understanding of the structure. As shown in this figure, the mask support member 24 is connected to a slider 26b via a pin 29 at an intermediate position in the Y-axis plate portion 24a on one side (left side in the figure). Positions at both ends in the Y-axis direction of the shaft plate portion 24a and the sliders 26a, 26c are connected via link members 28a, 28c that are pin-connected at both ends, respectively. Similarly, the Y-axis plate ends 24a on the other side of the mask support member 24, and the three intermediate positions in the Y-axis direction and the sliders 26a to 26c are similarly connected via link members 28a to 28c connected to both ends. Yes.

  The nut member 33 is fixed to the middle slider 26b among the three sliders 26a to 26c respectively connected to the Y-axis plate portions 24a of the mask support member 24. The nut member 33 is fixed to the nut member 33 in the Y-axis direction. The extending screw shaft 32 is screwed and inserted, and these screw shafts 32 are integrated with the output shaft of the motor 30 fixed to the apparatus frame 6.

  With this configuration, when each motor 30 is driven at the same speed in the same direction, the mask support member 24 moves in the Y-axis direction while maintaining the state as it is. For example, as shown in FIG. When only one motor 30 is driven, the mask support member 24 rotates around the Z axis with the pin 29 as a fulcrum.

  In each of the print execution units 20A and 20B, the squeegee unit 40 is disposed above the mask holding mechanism. This squeegee unit 40 expands a paste such as cream solder or conductive paste on the mask 21 while rolling (kneading) the squeegee unit 40, and changes the tilt direction and tilt angle of the single squeegee 42 and the squeegee 42 with respect to the mask 21. A squeegee angle variable mechanism (not shown) for moving the squeegee 42 up and down to a printing work height position where the squeegee 42 is in sliding contact with the mask 21 and a retreat position (position shown in FIGS. 2 and 6) above this position. Including an outer squeegee lifting mechanism and the like.

  The squeegee drive mechanism that drives the squeegee unit 40 in the Y-axis direction is configured by a screw feed mechanism. That is, as shown in FIGS. 6 and 7, the squeegee units 40 of the print execution units 20A and 20B are movably supported on a common fixed rail 44 provided in the apparatus frame 6 and extending in the Y-axis direction. The motors 46A and 46B are driven independently of each other via screw shafts 47A and 47B, respectively.

  Reference numerals 50A and 50B in FIG. 6 are substrate recognition cameras (corresponding to the substrate imaging means of the present invention), and the substrates W and print execution units 20A and 20B supported on the substrate support tables 10A and 10B. In order to recognize the relative position, a plurality of marks such as marks and symbols on the substrate W are imaged from above. These substrate recognition cameras 50A and 50B (referred to as the first substrate recognition camera 50A and the second substrate recognition camera 50B) are cameras equipped with a CCD area sensor and the like, similar to the mask recognition camera 16, and are fixed to the apparatus frame 6. Yes. Specifically, among the apparatus frames 6 positioned on the substrate carry-in portions En1 and En2 side, the first substrate recognition camera 50A is located at a side position of the first print execution unit 20A, and the second substrate recognition camera 50B is printed second. Each is fixed to a side position of the execution unit 20B. Accordingly, the first substrate recognition camera 50A moves in the X-axis direction from the substrate standby position P1 to the print execution position P2 on the first substrate support table 10A that moves in the Y-axis direction by returning from the sending position to the receiving position. The clamp unit 14 can image a plurality of marks on the holding substrate W that moves in both the X-axis direction and the Y-axis direction with respect to the first substrate recognition camera 50A, and the second substrate recognition camera 50B is sent out. The second substrate recognition camera 50B of the clamp unit 14 that moves in the X axis direction from the substrate standby position P1 to the print execution position P2 on the second substrate support table 10B that moves in the Y axis direction by returning from the position to the receiving position. On the other hand, it is possible to image a plurality of marks on the holding substrate W that move in both the X-axis direction and the Y-axis direction.

  The printing apparatus 1 includes a control device (not shown) having a CPU or the like as a constituent element (corresponding to the control means of the present invention). The actuators such as the motors 4A and 4B and the camera such as the mask recognition camera 16 are provided. All classes are electrically connected to this controller. Accordingly, a series of printing processing operations by the substrate support tables 10A and 10B and the print execution units 20A and 20B, that is, receiving the substrate W carried in from the substrate carry-in units En1 and En2, printing on the substrate W, and substrate unloading unit Ex1. , A series of operations for unloading the substrate W from Ex2 are comprehensively controlled by this control device.

  Next, a printing operation of the printing apparatus 1 based on the control of the control apparatus will be described with reference to FIGS. 10 and 11.

  FIG. 10A schematically shows a state at a specific time point of the printing operation continuously performed in the printing apparatus 1, and the substrate support tables 10A and 10B and the print execution units 20A and 20B at this time point. The state is as follows.

  The first substrate support table 10A is disposed at the receiving position on the first substrate carry-in portion En1 side. The first substrate support table 10A is placed in the print execution position P2 while the preceding substrate W is held by the clamp unit 14, and the subsequent substrate is brought into the substrate standby position P1 and is in a standby state. Printing is performed on the preceding substrate W by the print execution unit 20A. The substrate W at the printing execution position P2 is supported by the clamp unit 14 in a state where it is lifted from the conveyor pair 12 as shown in FIG.

  On the other hand, the second substrate support table 10B is disposed at the delivery position on the second substrate carry-in portion Ex2 side. In the second substrate support table 10B, the preceding substrate W after printing is sent out to the second substrate unloading section Ex2 by the conveyor pair 12, and the subsequent substrate W at the substrate standby position P1 is clamped by the clamp unit 14. is there.

  In the state shown in FIG. 10A, when the printing of the preceding substrate W on the first substrate support table 10A is finished, the first substrate support table 10A starts moving from the receiving position toward the sending position. At the same time, the clamping state of the substrate W by the clamp unit 14 is released, and the preceding printed substrate W is transferred onto the conveyor pair 12, and the clamp unit 14 moves from the printing execution position P2 to the substrate standby position P1. The subsequent substrate W waiting in the substrate standby position P1 is clamped by the clamp unit 14 (FIG. 10B). Specifically, after the clamp unit 14 moves to the substrate standby position P1, the BU table 150 is raised from the retracted position to the operating position, whereby the substrate W is lifted from the conveyor pair 12 (belt 121), and the clamp is held in this state. When the member 160 is displaced from the retracted position to the advanced position, the substrate W is clamped by the pair of clamp members 160. The clamping of the substrate W by the clamping unit 14 is performed, for example, by the time when the first substrate support table 10A reaches the delivery position in the present embodiment.

  When the first substrate support table 10A reaches the delivery position, the conveyor pair 12 is driven, whereby the printed preceding substrate W is delivered from the first substrate support table 10A to the first substrate unloading section Ex1 (FIG. 11 (a). )).

When the printed preceding substrate W is sent out from the first substrate support table 10A, the conveyor pair 12 is stopped, and the first substrate support table 10A moves from the sending position toward the receiving position in the Y-axis direction and is synchronized therewith. Then, the clamp unit 14 moves in the X-axis direction from the substrate standby position P1 toward the print execution position P2. At this time, the plurality of signs written on the substrate W sequentially pass through the lower position (corresponding to the imaging position of the present invention) of the first board recognition camera 50A, and the lower position of the mark written on the lower surface of the mask 21 the first substrate supporting table 10A and the clamping unit 14 is controlled so as to pass through mask recognition camera 16 a. As a result, the positions of the substrate W and the mask 21 are image-recognized. Based on the image recognition results of the substrate W and the mask 21, the positional deviation between the substrate W and the mask 21 when the substrate W is disposed at the print execution position P2 is detected. Further, correction values (ΔX, ΔY, ΔR) in the X-axis, Y-axis, and R-axis (around Z-axis) directions corresponding to the positional deviation are obtained. Such recognition processing and calculation of correction values are performed by the control device based on images captured by the substrate recognition camera 50 and the mask recognition camera 16. The clamp unit 14 is controlled such that, for example, in the present embodiment, the substrate W is disposed at the print execution position P2 on the first substrate support table 10A when the first substrate support table 10A reaches the receiving position. The

  Then, as shown in FIG. 11B, when the first substrate support table 10A reaches the receiving position, the printing on the substrate W is performed by the first print execution unit 20A, and the conveyor pair 12 is driven in the meantime. Accordingly, the subsequent substrate W is received from the first substrate carry-in portion En2 onto the first substrate support table 10A and is placed at the substrate standby position P1. At this time, since the substrate W at the print execution position P2 is clamped by the clamp unit 14 while being lifted from the conveyor pair 12, the substrate W at the print execution position P2 is displaced as the subsequent substrate W is received. There is nothing.

  In the printing of the substrate W by the first printing execution unit 20A, first, the mask support member 24 is lowered from the retracted position to the heavy equipment height position, whereby the mask 21 is placed on the substrate W. At this time, the position of the substrate W on the substrate support table 10A by the motor 144 based on the correction values (ΔX, ΔY, ΔR) in a state where the first substrate support table 10A is arranged at the first receiving position is The correction is performed in the direction by the correction value ΔX, and the position correction for the correction value ΔY in the Y-axis direction and the correction value ΔR in the R-axis direction of the mask 21 are performed by the two motors 30 respectively. The mask 21 is properly stacked on the substrate W.

  When the mask 21 is completely loaded on the substrate W arranged at the printing execution position P2, the squeegee 42 is moved from the retracted position to the printing work height position, and then the entire squeegee unit 40 including the squeegee 42 is moved to the Y axis. Printing on the substrate W is performed by moving in the direction.

  The operation of the first substrate support table 10A from the state shown in FIG. 10A has been described above, but the second substrate support table 10B is also shown in FIGS. 10B, 11A, and 11B. As described above, the substrate W is received from the second substrate carry-in portion En2 and printed, and the second substrate carry-out portion of the substrate W, with a certain time difference from the first substrate support table 10A. The substrate W is sent out to Ex2. As a result, the printing of the board W is alternately performed in each of the printing execution units 20A and 20B, and is carried out to the component mounting apparatus M.

  As described above, in the printing apparatus 1, after the preceding substrate W printed at the carry-out position is sent from the substrate support tables 10A and 10B to the board carry-out portions Ex1 and Ex2, the substrate support tables 10A and 10B are reset to the receiving position. At this point, the subsequent substrate W is placed at the print execution position P2, and in the process of resetting the substrate support tables 10A, 10B from the sending position to the receiving position in this manner, the subsequent substrate W (by the substrate recognition cameras 50A, 50B) By performing the image recognition of the sign) and the image recognition of the mask 21 by the mask recognition camera 16, printing by the print execution units 20A and 20B is started immediately after the substrate support tables 10A and 10B are reset to the receiving positions. . Therefore, according to the printing apparatus 1, the printing of the subsequent substrate W is started at an early timing after the printing of the preceding substrate W is completed, as compared with the conventional apparatus described in Patent Document 2 described in the background art. Is possible.

  FIG. 12 is a process diagram comparing the operation of the printing apparatus 1 (FIG. 12A) and the operation of the conventional apparatus (FIG. 12B). As shown in FIG. 4B, in the conventional apparatus, the preceding substrate is printed, the substrate support table (stage) is moved to the unloading position, the substrate is unloaded, the substrate support table is moved to the substrate receiving position, and the subsequent substrate is loaded. In the printing apparatus 1, the substrate support table for the subsequent substrate W is printed during the printing of the previous substrate W, as shown in FIG. 10A and 10B are carried in, and the subsequent substrate W is clamped until the substrate support tables 10A and 10B are moved to the delivery position, the previous substrate W is unloaded and reset to the reception position, and the substrate support is performed. The substrate W starts to move from the substrate standby position P1 to the print execution position P2 on the tables 10A and 10B. During this movement, image recognition of the substrate W / mask 21 is performed, and then the print execution position P2 is reached. Subsequent substrate W is disposed. That is, according to the printing apparatus 1, the preparation for printing the subsequent substrate W is almost completed within the process enclosed by curly brackets in FIG. Therefore, according to this printing apparatus 1, the time from the end of printing of the preceding substrate W to the start of printing of the subsequent substrate W can be significantly shortened compared to the conventional apparatus, and as a result, the throughput is improved and the printed circuit is improved. It can contribute to productivity improvement of a board.

  Further, in this printing apparatus 1, the substrate recognition cameras 50 </ b> A and 50 </ b> B are fixed to the apparatus frame 6 using the points that the substrate support tables 10 </ b> A and 10 </ b> B move in the Y-axis direction and the clamp unit 14 move in the X-axis direction, respectively. Then, the substrate W (marker) is imaged, and the mask recognition camera 16 is mounted on the clamp unit 14 to move the mask recognition camera 16 two-dimensionally to image the mask 21 (marker). . That is, in this printing apparatus 1, a dedicated drive mechanism for moving the substrate recognition cameras 50A and 50B and the mask recognition camera 16 is not necessary, and therefore image recognition of the substrate W and the mask 21 is performed with a reasonable configuration. There is also an advantage of being able to.

  In the printing apparatus 1, the conveyance of the substrate W from the substrate carry-in portions En1 and En2 to the substrate standby position P1 and the conveyance of the substrate W from the print execution position P2 to the substrate carry-out portions Ex1 and Ex2 are common conveyor pairs 12. Of course, the conveyor pair for transporting the substrate W from the substrate loading portions En1 and En2 to the substrate standby position P1 and the conveyor pair for transporting the substrate W from the printing execution position P2 to the substrate unloading portions Ex1 and Ex2 are separated. It may be provided independently.

  Next, a second embodiment of the screen printing apparatus according to the present invention will be described with reference to FIGS.

  FIG. 13 schematically shows a screen printing apparatus 1A (hereinafter abbreviated as printing apparatus 1A) according to the second embodiment in a plan view. The printing apparatus 1A according to the second embodiment is incorporated into a printed circuit board (PCB) production line with a single-carrying-type component mounting apparatus M connected to the downstream side. The configuration is different from the printing apparatus 1 of the embodiment. In the example shown in the figure, the printing apparatus 1A is interposed between one loader L and one single-conveying type component mounting apparatus M, and is fed out from the upstream loader L. Printing is performed on W and sent to the component mounting apparatus M on the downstream side.

  In this printing apparatus 1A, the substrate carry-in unit, the substrate carry-out unit, the substrate support table, and the print execution unit are all one, and the substrate W carried from the substrate carry-in unit En is received by the substrate support table 10 and is transferred to the substrate W. After printing, the printed substrate W is sent out from the substrate support table 10 to the substrate carry-out section Ex. In this printing apparatus 1A, the substrate carry-out portion Ex is not offset in the Y-axis direction with respect to the substrate carry-in portion En, but the substrate support table 10 is movable in the Y-axis direction as in the first embodiment. Is provided.

  The printing apparatus 1A also has one board recognition camera, and the board recognition camera 50 is connected to the camera drive mechanism 52 and is movable in the Y-axis direction. Although the camera drive mechanism is not shown in detail, it is constituted by, for example, a screw feed mechanism. That is, the board recognition camera 50 is movably supported on a fixed rail assembled to the apparatus frame 6 and is driven by a motor through a screw shaft.

  In this printing apparatus 1A, as shown in the figure, the print execution unit 20 for the substrate W arranged at the print execution position P2 with the substrates W arranged at the print execution position P2 and the substrate standby position P1, respectively. Printing is performed by the above.

  When the printing is finished, the clamp state of the clamp unit 14 is released, and the printed preceding substrate W is transferred to the conveyor pair 12, whereby the substrate W is sent out to the substrate unloading unit Ex by the conveyor pair 12. The clamp unit 14 after releasing the clamp moves to the substrate standby position P1, and clamps the subsequent substrate W that is on standby after the stop (FIG. 14A). At this time, the conveyor pair 12 is driven in synchronization with the clamp release of the printed preceding substrate W, but the subsequent substrate W is maintained in the standby state by the stopper mechanism 15, so that the subsequent by the clamp unit 14 is performed. The substrate W is clamped stably.

  During the printing of the substrate W, the substrate support table 10 receives the substrate W from the predetermined loading position, that is, the substrate loading portion En, and sends the substrate W to the substrate unloading portion Ex by positioning the mask 21 and the substrate W. When the substrate support table 10 is arranged at a position moved in the Y-axis direction with respect to the possible position, the substrate support table 10 is reset to the reference position after printing and before the preceding substrate W is released from the clamp. .

  When the clamping of the subsequent substrate W by the clamp unit 14 is completed, the substrate W is transported from the substrate standby position P1 to the print execution position P2 by the movement of the clamp unit 14, and the substrate is transferred from the substrate carry-in portion En onto the substrate support table 10. W accepts (FIG. 14B). At this time, when the substrate recognition camera 50 moves in the Y-axis direction, the marker on the substrate W is imaged by the substrate recognition camera 50, and when the substrate support table 10 moves in the Y-axis direction, The sign is imaged and recognized by the mask recognition camera 16, and correction values (ΔX, ΔY, ΔR) are obtained based on the image recognition results of the substrate W and the mask 21. For example, in the case where a sign is written at each corner on the diagonal line of the substrate W, as shown in FIGS. 14B and 14C, the position on the sign as the clamp unit 14 (substrate W) moves. As the substrate recognition camera 50 moves, the signs are sequentially imaged by the substrate recognition camera 50.

  Then, when the substrate W held by the clamp unit 14 reaches the printing execution position P2, Y is used as an indicator on the lower surface of the mask 21 that is detachably attached to a frame (not shown) connected and fixed to the base 2. The substrate support table 10 moved to move in the axial direction is moved in the Y-axis direction to return it to the original position. The substrate support table 10 can be rotated by a predetermined angle around the Z axis (R axis direction) passing through the central portion of the mask 21 and is rotated by the correction value ΔR. The substrate W is held on the rotating substrate support table 10 by the clamp unit 14, and the correction value ΔY1 of the substrate support table 10 in the Y-axis direction and the correction value ΔX1 of the movement direction of the clamp unit 14 with respect to the substrate support table 10 are detected. Are calculated based on the correction value ΔR, the correction value ΔX, and the correction value ΔY, respectively. Based on these calculated values, the clamp unit 14 is moved by the correction value ΔX1, and the substrate support table is moved in the Y-axis direction by the correction value ΔY1. Thereafter, the substrate support table 10 that can be raised and lowered with respect to the base 2 is raised, and the substrate W is mounted on the mask 21 from below. Thus, printing on the substrate W is performed by the first printing execution unit 20A. The printing operation of the substrate W by the printing execution unit 20 is the same as that of the printing apparatus 1 of the first embodiment, and is omitted here.

  According to the printing apparatus 1A of the second embodiment as described above, the substrate W can be printed by the print execution unit 20 in advance by the clamp unit 14 at the substrate standby position P1 upstream of the substrate execution position. In the middle of transporting the substrate W from the substrate standby position P1 to the print execution position P2, the substrate recognition camera 50 captures the substrate W (sign) and the mask recognition camera 16 captures the mask 21 (sign). So, once the substrate is transported and arranged to the printing execution position, the substrate is moved to the imaging position on the side of the printing execution position and the substrate is imaged, or the substrate is carried in and arranged at the printing execution position, The substrate W can be printed more efficiently than when the moving camera is operated to image the substrate or mask (conventional devices described in Patent Documents 1 and 2 of the background art). That is, when the substrate W and the mask are imaged after the substrate W is once carried into the print execution position as described above, an imaging process of the substrate W or the like is required separately from the substrate transport process to the print execution position. However, according to the printing apparatus 1B, since the transport of the substrate W to the printing execution position P2 and the imaging of the substrate W and the like are performed in parallel, the tact time can be shortened accordingly.

  Moreover, after printing, the clamp unit 14 returns to the substrate standby position P1 while holding the preceding printed substrate W to the substrate carry-out section Ex, holds the subsequent substrate W, and transports it to the print execution position P2. Therefore, printing of the subsequent substrate W can be started in a shorter time than when the subsequent substrate is received from the substrate carry-in portion from the time when the printed substrate W is completely sent to the substrate carry-out portion. Tact time can be shortened.

  Therefore, according to the printing apparatus 1A of the second embodiment, this type of conventional screen printing apparatus (for example, described in Patent Document 1 of the background art) in which a single-conveyance type component mounting apparatus or the like is disposed on the downstream side. The throughput can be improved as compared with the conventional apparatus), which can contribute to the productivity improvement of the printed circuit board.

  Next, a third embodiment of the screen printing apparatus according to the present invention will be described with reference to FIG.

  FIG. 15A schematically shows a screen printing apparatus 1B (hereinafter abbreviated as printing apparatus 1B) according to the third embodiment in a plan view. The printing apparatus 1B according to the third embodiment is a modification of the printing apparatus 1A (see FIG. 13 and the like) according to the second embodiment described above, and differs in configuration from the printing apparatus 1A according to the second embodiment in the following points. . That is, the printing apparatus 1B includes an inspection camera 60 for inspecting the printing state of the printed substrate W to a position that is lateral to the print execution position P2, and an X for moving the inspection camera 60 secondarily. A printing apparatus with an inspection function including a camera drive mechanism 62 formed of a Y robot.

  Further, the substrate support table 10 can be moved only in the Y-axis direction like the substrate support table 10A according to the first embodiment, and the configuration around the mask (not shown) of the print execution unit 20 is the mask 21 according to the first embodiment. The mask is movable in the X-axis direction, the R-axis direction, and the Z-axis direction. Therefore, similarly to the mask recognition camera 16 and the substrate recognition camera 50 according to the second embodiment, the mask recognition camera 16 takes an image of the mask (sign), and the substrate recognition camera 50 takes an image of the substrate W (sign). As in the first embodiment, the position of the substrate support table 10 is moved by the correction value ΔY and the position of the mask is moved by the correction value ΔX by the correction values (ΔX, ΔY, ΔR) obtained based on the result. And is rotated by the correction value ΔR. Through this, the mask is placed on the substrate W from above.

  Most of the printing operation by the printing apparatus 1B is the same as that of the printing apparatus 1A of the second embodiment. In the printing apparatus 1B, as shown in FIG. Is moved to the inspection execution position on the side of the print execution unit 20, and after the print location is imaged by the inspection camera 60, the substrate support table 10 returns to the reference position and carries out the printed preceding substrate W. It is like that.

  According to the printing apparatus 1B of the third embodiment as described above, the board W is efficiently printed, and further, the board W is inspected in the printing apparatus 1B, and then is carried out to the component mounting apparatus M. It becomes possible. Therefore, it is possible to avoid the inconvenience that the board W in which printing failure has occurred is sent to the component mounting apparatus M as it is, and there is an advantage that the functionality of the printing apparatus 1B can be improved.

  According to the printing apparatuses 1, 1 </ b> A, and 1 </ b> B of the first to third embodiments described above, after the clamp unit 14 (conveyance holding unit) delivers the preceding substrate W after the printing to the conveyor pair 12 (conveyance unit). The conveyor pair 12 transports the subsequent substrate W to the substrate standby position P1 and waits until it moves from the print execution position 20 and arrives at the substrate standby position P1 (specific position), and the clamp unit 14 waits for the substrate standby position P1. The clamping unit is configured so that the conveyor pair 12 finishes transporting the preceding substrate W downstream from the printing execution position 20 until it moves from the substrate standby position P1 and arrives at the printing execution position 20 after receiving and holding the subsequent substrate W. 14. A control device (control means) for controlling the conveyor pair is provided. As a result, the transport of the preceding substrate W, which has been printed, to the substrate carry-out portions Ex, EX1, and Ex2 and the operation for transporting the waiting subsequent substrate W from the substrate standby position P1 to the print execution position P2 are performed in parallel. Therefore, the tact time can be further shortened.

  By the way, the above-described screen printing apparatuses 1, 1A, and 1B are examples of preferred embodiments of the screen printing apparatus according to the present invention, and the specific configuration thereof can be appropriately changed without departing from the gist of the present invention. is there. For example, the specific support structure of the substrate W in the substrate support tables 10, 10A, 10B, the specific holding structure of the mask 21 in the print execution units 20, 20A, 20B, etc., the specific structure of the squeegee unit 40, etc. It is not necessarily limited to the screen printing apparatuses 1, 1 </ b> A, and 1 </ b> B of the above embodiment, and can be changed as appropriate.

1, 1A, 1B Screen printing device 10, 10A, 10B Substrate support table, first substrate support table, second substrate support table 14 Clamp unit 20, 20A, 20B Print execution unit, first print execution unit, second print execution Unit 21 Screen mask 40 Squeegee unit 42 Squeegee 50, 50A, 50B Substrate recognition camera, first substrate recognition camera, second substrate recognition camera En, En1, En2 Substrate carry-in part, first substrate carry-in part, second substrate carry-in part Ex , Ex1, Ex2 Substrate unloading unit, first substrate unloading unit, second substrate unloading unit L, L1, L2 Loader, first loader, second loader M Component mounting device P1 Substrate standby position P2 Print execution position W Substrate

Claims (4)

In screen printing equipment,
A print execution unit that includes a screen mask and performs screen printing on the substrate;
A board carry-in part provided at one position in a specific direction across the print execution part and a position on the other side that are offset in an orthogonal direction perpendicular to the specific direction with respect to the board carry-in part A board unloading section provided;
A substrate carried in from the substrate carry-in unit is received at a specific position on the substrate carry-in unit side from a print execution position where printing by the print execution unit is possible, and the substrate can be printed in advance by the print execution unit. Transport holding means for transporting the substrate from the specific position to the printing execution position by holding the substrate during the printing by moving the substrate in the specific direction after being held in a state ;
During conveyance of the substrate by the transport retaining means to the printing execution position from the specific position even before printing by the print execution unit, a board imaging means for imaging the substrate held on the transport retaining means,
A transport unit that is provided separately from the transport and holding unit, transports the substrate loaded from the substrate carry-in unit to the specific position and waits, and receives the printed substrate from the transport and hold unit and transports the substrate to the substrate carry-out unit. Means,
The conveyance holding means and the conveyance means are mounted, and a receiving position where the substrate carried in from the substrate carrying-in portion can be received and a sending position where the printed substrate can be sent out to the substrate carrying-out portion are covered. And a movable table having a standby space for allowing a subsequent substrate to stand by at a predetermined position on the substrate carry-in portion side in the specific direction.
A control means for controlling the transport holding means, the transport means and the movable table ;
The print execution unit is provided at a position where printing can be performed on a substrate disposed at the print execution position in a state where the movable table is disposed at the receiving position.
The control means sets the standby space on the movable table as the specific position, and the transport holding means prints the predetermined position on the substrate carry-out portion side in the specific direction on the movable table as the print execution position. After transferring the preceding substrate after completion to the transport unit, the transport unit transports the subsequent substrate to the specific position and waits until it moves from the print execution position and arrives at the specific position. After the conveyance holding means receives and holds the subsequent substrate at the specific position, the conveyance means conveys the preceding substrate downstream from the print execution position until it moves from the specific position and reaches the print execution position. On the other hand, after the printing of the preceding substrate is finished, the movable table is moved from the receiving position to the sending position, and then transferred to the conveying means. The preceding substrate is transported from the movable table to the substrate unloading unit by transporting the preceding substrate, and the movable table is moved from the sending position to the receiving position after the feeding, and the specific position is moved during the movement. A screen printing apparatus , wherein the movable table and the conveyance holding means are moved so that the mark on the subsequent substrate conveyed from the printing position to the printing execution position passes through the imaging position by the substrate imaging means . The screen printing apparatus according to claim 1,
The control means is configured such that after the preceding substrate is sent to the substrate carry-out unit, the succeeding substrate held by the transport holding means is arranged at the printing execution position when the movable table reaches the receiving position. screen printing apparatus characterized that you control the movable table and the carrier holder means as are. The screen printing apparatus according to claim 1 or 2,
The board imaging means, a screen printing apparatus characterized that you have to be movable in the direction perpendicular to the conveying direction of the subsequent substrate by the carrier holder means. The screen printing apparatus according to any one of claims 1 to 3,
The transport and holding unit includes a substrate holding member that holds a substrate and a moving unit that moves the substrate between the specific position and the print execution position.
The substrate holding member, a screen printing apparatus according to claim Rukoto mask imaging means for imaging the screen mask are equipped.

Images