WO2011142242A1 - Screen printer - Google Patents

Abstract

Disclosed is an improved screen printer. Feed screws (136) provided to the four corners of a mask-supporting device body (60) are threaded to nuts (138) of a bed (128), and a hollow guide rod (126) that is provided protruding in the center section is slidably fitted to a guide sleeve (130) of the bed (128). Feed screws (376) provided to the four corners of the body (300) of a substrate-supporting device (150) of a substrate-holding device (14) are threaded to the nuts (378, 344) of each of a clamp device body (154) and the mask-supporting device body (60), and a guide rod (366) provided protruding from the center section of the body (300) of the substrate-supporting device (150) is slidably fitted to the first guide rod (126) through a guide sleeve (368) of the clamp device body (154). The mask-supporting device (16) rises and falls by means of the rotation of the first nuts (138), and the substrate-holding device (14) rises and falls with respect to the mask-supporting device (16) by means of the rotation of the second nuts (344), and the substrate-supporting device (150) rises and falls with respect to a side clamp device (152) by means of the rotation of the second feed screws (376), resulting in a substrate (32) being supported, clamped, put in contact with a mask, and the like.

Description

Screen printing machine

The present invention relates to a screen printing machine that prints a printing material such as cream solder on a circuit board.

The screen printing machine described in Patent Literature 1 includes a substrate holding device that holds a circuit board horizontally, a mask support device that supports a mask from below, a substrate holding device lifting device, and a mask support device lifting device. The substrate holding device includes a substrate support device that supports the lower surface of the circuit substrate, a substrate clamp device that clamps the circuit substrate, and a substrate support device lifting device. The mask support device lifting device includes a nut fixed at a position deviated from the center of the mask support device main body, a feed screw that is rotatably provided around the vertical axis on the screen printing machine main body and screwed with the nut, An electric motor for rotating the feed screw, and the mask support device is raised and lowered while being guided by fitting between an engagement block provided on a side surface of the mask support device main body and a guide provided on the screen printing machine main body. The substrate holding device elevating device includes a plurality of cam followers provided at locations deviating from the central portion of the substrate clamp device main body, a plurality of cams provided on the mask support device main body so as to be movable in the horizontal direction, and the cams are moved. A cam driving device. The cam drive device includes a feed screw provided on the mask support device main body so as to be rotatable around a horizontal axis, a nut provided on the cam and screwed with the feed screw, and an electric motor for rotating the feed screw, By the movement of the cam, the substrate holding device is moved up and down by the action of the inclined surface of the cam surface inclined with respect to the horizontal plane. The substrate support lifting device includes a feed screw provided at a central portion of the substrate clamp device main body so as to be rotatable around a vertical axis, a nut fixed to the central portion of the substrate support device main body and screwed to the feed screw, And an electric motor for rotating the feed screw. Guide rods are extended downward from a plurality of locations off the central portion of the substrate support device body, and are slidably fitted to the clamp device body and the mask support device body to raise and lower the substrate support device and the substrate clamp device. invite.
In this screen printing machine, the circuit board is raised to a predetermined position with respect to the substrate clamping device by the raising of the substrate supporting device, and is clamped. Further, as the substrate holding device is raised, the circuit board is raised with respect to the mask support device, and is set to the same height as the mask support device. Then, the substrate holding device and the mask support device are raised together, the circuit board and the mask support device are brought into contact with the mask, and the printing material is printed on the circuit board with the mask supported by the mask support device. Done.

JP 2006-281712 A

However, there is still room for improvement in conventional screen printers. For example, since the substrate support device lifting device and the mask support device lifting device are each supported by screwing of one feed screw and a nut, the support rigidity is insufficient and the substrate is easily tilted by the force applied during printing. In addition, the three devices are lifted and lowered by separate lifting devices, so that the number of parts is large and the configuration of the printing press is complicated.
Such a problem occurs not only in a screen printer including all of the substrate support device, the substrate clamp device, and the mask support device, but also in a screen printer including two of them.
The present invention has been made against the background of the above circumstances, and an object thereof is to provide an improved screen printing machine that solves the above problems.

The above problem is to provide a screen printing machine that moves a printing material by a squeegee along the upper surface of a horizontal mask in which a plurality of through holes are formed, and prints the printing material on a circuit board through the through holes of the mask. A circuit board contact / separation device that contacts and separates the circuit board from the mask, the circuit board contact / separation device comprising: (a) a first member and a second member that move up and down relative to each other; and (b) a first member thereof. (C) a plurality of feeds extended in parallel with the guide rod from the second member at a plurality of positions located on both sides of the guide rod; A screw, (d) a guide sleeve provided on the first member and slidably fitted to the guide rod, and (e) a screw provided on the first member, each of the plurality of feed screws and screws. Combined multiple nuts It is solved by as comprising a relative rotation device which simultaneously relative rotation and (f) said plurality of feed screw and the plurality of nuts.
The first member and the second member may be, for example, two of the main body of the mask support device, the main body of the substrate clamp device, and the main body of the substrate support device in each section of the aspect of the invention. Or any one of the above-described devices.

The above-mentioned problem is also a screen printing machine that moves a printing material by a squeegee along the upper surface of a horizontal mask in which a plurality of through holes are formed, and prints the printing material on a circuit board through the through holes of the mask. (A) a substrate holding device that holds the circuit board horizontally; (B) a substrate holding device lifting device that lifts and lowers the substrate holding device to contact and separate the circuit board from the lower surface of the mask; and (C). A mask support device for supporting the mask from below by contacting a portion of the lower surface of the mask outside the portion where the circuit board is contacted and separated; and (D) the mask support device by raising and lowering the mask support device. A mask support device lifting device that contacts and separates the lower surface of the mask, and (E) a screen printing machine main body, and the mask support device lifting device includes the screen mark. A first guide device that guides the lifting and lowering of the mask support device relative to the machine main body, and a first lifting and lowering drive device that lifts and lowers the mask support device relative to the screen printing machine main body. A second guide device that guides the lifting and lowering of the substrate holding device relative to the mask support device; and a second lifting and lowering drive device that lifts and lowers the substrate holding device relative to the mask support device, and the first guide device includes: A hollow first guide rod extending downward from a central portion of the mask support device, and a first guide sleeve provided in the screen printing machine main body and slidably fitted to the first guide rod The second guide device extends downward from the center of the substrate holding device and slides into the hollow first guide rod. It is solved by as including second guide rod is fitted into the ability.

In one of the screen printing machines according to the present invention, the first and second members are supported with high rigidity by screwing a plurality of feed screws and nuts, are not easily tilted, and the posture stability of the circuit board during printing is improved. improves. Further, since the first and second members are relatively moved up and down by at least a plurality of feed screws located on both sides of the guide rod, a moment is applied to the guide rod and the guide sleeve to incline them from each other. And the effect of improving the durability of the guide rod and the guide sleeve is obtained. Furthermore, by providing feed screws at a plurality of positions located on both sides of the guide rod, sufficient bending rigidity is obtained, and it is sufficient that the first member and the second member rotate relatively around the axis of the guide rod. To be prevented.

In another screen printing machine according to the present invention, the first guide device and the second guide device are fitted to each other by fitting the first guide rod and the second guide rod to each other below the central portion of the mask support device. Arrangement space can be overlapped vertically, and it is possible to adopt different arrangements of the first and second guide devices and the first and second raising / lowering drive devices from the conventional ones. For example, as in the screen printing machine according to the item (4) of the aspect of the invention, the first elevating drive device is a device including a plurality of feed screws and nuts, and the circuit board holding device has a holding stability of the circuit board. It becomes easy to improve. In addition, the hollow first guide rod functions as a guide sleeve for the second guide rod, and the configuration is simplified as compared with the case where a guide sleeve dedicated to the second guide rod is provided in the mask support device. Can be configured compactly.

Aspects of the Invention

In the following, the invention recognized as being claimable in the present application (hereinafter referred to as “claimable invention” may be referred to as a subordinate concept invention of the present invention, a superordinate concept of the present invention, or a different concept). Some aspects of the invention may be included, and will be described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiment, the prior art, the common general technical knowledge, and the like. An aspect in which a constituent element is added and an aspect in which the constituent element is deleted from the aspect of each section can be an aspect of the claimable invention.

In each of the following terms, (1) corresponds to claim 1, (2) corresponds to claim 2, (3) corresponds to claim 3, (4) corresponds to claim 4, (6) corresponds to claim 5, (8) corresponds to claim 6, (10) corresponds to claim 7, and (17) corresponds to claim 8.

(1) A screen printing machine that moves a printing material by a squeegee along the upper surface of a horizontal mask in which a plurality of through holes are formed, and prints the printing material on a circuit board through the through holes of the mask. ,
A circuit board contacting / separating device for contacting and separating the circuit board from the mask, the circuit board contacting / separating device comprising: (a) a first member and a second member that move up and down relative to each other; and (b) a second member. And (c) a plurality of feed screws extending in parallel with the guide rod from the second member at a plurality of positions located on both sides of the guide rod. (D) a guide sleeve provided on the first member and slidably fitted to the guide rod; and (e) provided on the first member and screwed with the plurality of feed screws. A screen printing machine comprising: a plurality of nuts; and (f) a relative rotation device that relatively rotates the plurality of feed screws and the nuts simultaneously.
The above-mentioned “plural positions located on both sides of the guide rod” means that the intersection of the axis of the guide rod and the plane perpendicular to the axis is the intersection of the plane and the axes of the plurality of feed screws. It means to be located within an area defined by a line segment that connects without intersecting. The above region is considered to be a triangular region when there are three lead screws, a quadrilateral region when there are four lead screws, and a special region with no width when there are two lead screws. That is, the axis of the guide rod is perpendicular to the straight line connecting the axes of the two feed screws.
The following features (3) and below can be applied to the screen printer described in this section.
(2) The circuit board contacting / separating device is further extended (g) a third member that moves relative to the second member in the vertical direction, and (h) extends from the third member in the vertical direction. A guide rod including a guide rod and extending from the second member is a hollow guide rod, and the guide rod extended from the third member is slid inside the hollow guide rod. The screen printer according to item (1), which is movably fitted.
The guide rod of the second member functions as a guide sleeve of the guide rod of the third member, and the effects of simplification and compactness of the configuration of the screen printing machine can be obtained.
(3) A screen printing machine that moves a printing material by a squeegee along an upper surface of a horizontal mask in which a plurality of through holes are formed, and prints the printing material on a circuit board through the through holes of the mask. ,
A board holding device for holding the circuit board horizontally;
A substrate holding device lifting device that lifts and lowers the substrate holding device to bring the circuit board into contact with and away from the lower surface of the mask; and
A mask support device for supporting the mask from below by contacting a portion of the lower surface of the mask that is outside the portion where the circuit board is contacted and separated;
A mask support lifting device for moving the mask support device up and down to contact and separate the lower surface of the mask;
And a first supporting device that guides the lifting and lowering of the mask supporting device relative to the screen printing device main body and the mask supporting device ascending and descending with respect to the screen printing device main body. A first lifting / lowering driving device, wherein the substrate holding device lifting / lowering device lifts / lowers the second holding device for guiding the lifting / lowering of the substrate holding device relative to the mask supporting device and the substrate supporting device relative to the mask supporting device. The first guide device includes a second lift driving device, and the first guide device is provided in the screen printing machine main body and the hollow first guide rod extended downward from the center of the mask support device. A first guide sleeve slidably fitted to the first guide rod, wherein the second guide device is a central portion of the substrate holding device A screen printing machine including a second guide rod extending downward from the second guide rod and slidably fitted in the hollow first guide rod.
In a screen printing machine that does not include a mask support device and includes a substrate support device and a substrate clamp device, relative elevation of one of the main body of the substrate support device, the main body of the substrate clamp device, and the main body of the screen printer is performed. The guide rod for guiding is hollow, and the guide rod for guiding the relative elevation of the main body of the substrate support device and the main body of the substrate clamp device is slidably fitted inside the hollow guide rod. The effect similar to the invention according to the item can be obtained.
(4) The first elevating drive device is
A plurality of first feed screws that extend downward from the mask support device in parallel to the first guide rod and in an axially unmovable manner at a plurality of positions located on both sides of the first guide rod; ,
A plurality of first nuts provided in the screen printing machine main body so as not to move relative to each other in the axial direction and screwed into each of the plurality of first feed screws;
The screen printing machine according to item (3), including a plurality of first feed screws screwed together and a plurality of first nuts that simultaneously rotate relative to each other.
Even with a single feed screw, the mask support device can be moved up and down. However, if a plurality of feed screws are provided, the mask support device can be supported with high rigidity and the mask can be stably supported.
The number of first feed screws may be two or three. However, it is desirable that the number is 4 as described in the next section.
(5) The screen printing machine according to (4), wherein the mask support device has a rectangular planar shape, and a total of four first feed screws are provided at four corners of the mask support device.
The mask support device is particularly rigid and stable and is supported horizontally, and tilting is prevented during both lifting and printing.
(6) The substrate holding device is
A substrate support device for supporting a lower surface of the circuit board;
A substrate clamping device for clamping and fixing the circuit board supported by the substrate supporting device;
A third guide device that guides raising and lowering of the substrate support device relative to the substrate clamp device, and a third elevating drive device that raises and lowers the substrate support device relative to the substrate clamp device, the second guide device and the second The screen printer according to any one of (3) to (5), wherein two lifting drive units are provided between the substrate clamping device and the mask support device.
(7) The third guide device is slidably fitted to the third guide rod provided on the substrate clamp device and a third guide rod extending downward from a central portion of the substrate support device. The screen printer according to item (6), including a combined third guide sleeve.
Each of the first, second, and third guide devices is provided in the central portion of the device, and the degree of freedom of arrangement of the second and third lifting drive devices is high.
(8) The screen printing machine according to (7), wherein the third guide rod also serves as the second guide rod.
The number of components can be reduced, and the screen printer can be easily configured.
(9) The third elevating drive device is
A plurality of third feed screws extending from the substrate support device in parallel with the third guide rod downward and in an axially unmovable manner at a plurality of positions located on both sides of the third guide rod; ,
A plurality of third nuts provided in the substrate clamping device so as not to move relative to each other in the axial direction and screwed into each of the plurality of third feed screws;
The screen printing machine according to item (7) or (8), including a third relative rotation device that relatively rotates the plurality of third feed screws and the plurality of third nuts that are screwed together.
The substrate support device is supported with high rigidity by screwing the plurality of feed screws and nuts.
The number of third feed screws may be two or three. However, it is desirable that the number is four as described in the explanation part of item (10).
(10) A second relative rotation in which the third feed screw is screwed with a second nut provided in the mask support device so as not to move in the axial direction, and the second nut and the third feed screw are relatively rotated. The screen printing machine according to item (9), in which an apparatus is provided, and the second nut and the second relative rotation device constitute the second lifting drive device in cooperation with the third feed screw.
By making the third feed screw also serve as the feed screw of the second elevating drive device, the screen printing machine is simpler and less expensive than the case where the board clamp device is provided with a dedicated feed screw that is screwed with the second nut. Configured. Further, the substrate clamping device is also supported with high rigidity by screwing a plurality of feed screws and nuts. If each of the first, second and third lifting drive devices has four feed screws provided at the four corners of the device to be driven, each of the three devices is described in the item (5). The same effect as that of the screen printer can be obtained.
Of the second nut, the third nut, and the third feed screw, one of them is non-rotatable and two are rotatable. Among the two rotatable devices, the device that rotates the substrate clamp device that is raised and lowered by the rotation constitutes the second relative rotating device, and the device that rotates the one that the substrate support device is raised and lowered by the rotation is the third relative device. Configure the rotating device.
(11) The substrate clamping device is
A clamping device body;
A movable clamp member that is held on the clamp device main body so as to be relatively movable in a direction parallel to the circuit board and perpendicular to one of both end faces of the circuit board;
The screen printing machine according to any one of (6) to (10), including a side clamp device including a clamp member driving device that drives the movable clamp member.
Since the side clamp device clamps the circuit board at both end faces of the circuit board, at least a pair of clamp members are necessary. The at least one pair of clamp members can be both movable clamp members or one can be a fixed clamp member.
(12) The movable clamp member has a longitudinal shape, and the clamp member driving device is held by the clamp device main body, and two places separated in the longitudinal direction of the movable clamp member are respectively provided on the both side end surfaces. The screen printing machine according to item (11), wherein the screen printing machine is moved closer to one side.
Even if the side end face of the circuit board is inclined, the movable clamp member can be placed along the side end face to stably clamp the circuit board.
The features described in this section can be adopted independently of the features described in any of the items (3) to (10).
(13) The clamp member driving device comprises:
A drive source comprising two output members operable in a direction parallel to the longitudinal direction of the movable clamp member;
Each one end is connected to each of the two output members so as to be relatively rotatable, and the other end is connected to the movable clamp member so as to be relatively rotatable. The screen printing machine according to item (12), including two connecting links having an angle formed by a straight line connecting two relative rotation axes with the connecting portion and a longitudinal direction of the movable clamp member being smaller than 45 degrees.
The output of the output member is reduced and acts on the movable clamp member in a direction approaching the side end surface of the circuit board, so that the circuit board is not clamped by an excessive force. In addition, if necessary, the output can be controlled and the clamping force can be changed minutely, so that the circuit board can be clamped with a force according to its rigidity by the movable clamping member. Become.
Note that the clamp member driving device can include, for example, two fluid pressure cylinders or one fluid pressure cylinder. The fluid pressure cylinder includes a linear fluid pressure cylinder including a cylinder housing, a piston slidably and airtightly fitted to the cylinder housing, and a piston rod extended from the piston to the outside of the cylinder housing. Is preferred. When the clamp member driving device includes two linear fluid pressure cylinders, for example, one of the cylinder housing and the piston rod may be connected to the clamp device main body, and the other to the connecting link. When the clamp member driving device includes one linear fluid pressure cylinder, the cylinder housing may be connected to one of the two connecting links and the piston rod may be connected to the other of the two connecting links. In this case, the cylinder housing and the piston rod each constitute an output member.
(14) The mask support device includes a mask support member having an upper surface serving as a mask support surface and a lower surface serving as a substrate receiving surface, and the substrate holding device lifting device includes the substrate holding device and the substrate support. (11) The side clamp device clamps the circuit board in a state where the circuit board supported by the device and the side clamp device are raised to a position in contact with or close to the substrate receiving surface of the mask support member. Or the screen printer according to any one of (13).
At the time of clamping, the edge of the circuit board is restrained from above by the board receiving surface, and it is possible to prevent a situation in which the edge of the circuit board comes off from the clamping member and is not clamped.
(15) The mask support member supports the mask at a position adjacent to the movable clamp member in a direction parallel to the mask, and an upper portion of a side surface of the mask support member facing the movable clamp member is the squeegee. And the mask support member of the movable clamp member, the lower portion of the side surface facing the movable clamp member being a parallel side surface parallel to the longitudinal direction of the squeegee. The screen printing machine according to (14), wherein a side surface opposite to the inclined side surface is an inclined side surface parallel to the inclined side surface, and a gap between the two inclined side surfaces is inclined with respect to the longitudinal direction of the squeegee in plan view. .
When the mask support member and the movable clamp member are both in contact with the mask, the gap between the mask support member and the movable clamp member intersects the longitudinal direction of the squeegee, and the gap is parallel to the longitudinal direction of the squeegee Thus, the squeegee does not fall into the gap, and damage to the squeegee and mask due to the fall into the gap is prevented.
Further, as described above, since the gap between the mask support member and the movable clamp member is inclined at a relatively large angle with respect to the longitudinal direction of the squeegee, the edge of the substrate receiving surface is defined by the parallel side surface. The edge of the board receiving surface extends parallel to the side edge of the circuit board, and the side edge of the circuit board can be received over the entire length of the side edge by a narrow portion near the edge.
When one of the pair of clamp members of the side clamp device is a fixed clamp member, it is desirable that the shape of the opposing side surfaces of the fixed clamp member and the mask support member also be the above shape.
The features described in this section can be adopted independently of the features described in any of the items (3) to (13).
(16) The substrate clamping device includes:
A clamping device body;
A first clamp member provided with a clamp portion that rises upward from the clamp device body and protrudes upward from the upper end of the substrate support device;
It is provided below the clamp part, and is raised and lowered as the board support device is moved up and down relative to the clamp apparatus body. The side end of the circuit board is sandwiched from both the upper and lower sides together with the clamp part. The screen printing machine according to any one of (6) to (10), including an upper and lower clamp device including a second clamp member to be fixed.
The features described in this section can be adopted independently of the features described in any of the items (3) to (10).
(17) The substrate holding device includes a suction port opened in a support surface that supports the circuit board, and the second guide rod is formed with a through hole penetrating the second guide rod in the longitudinal direction; The screen printing machine according to any one of (3) to (16), wherein the through hole and an internal space of the hollow first guide rod serve as an air suction passage communicating with the suction port.
Negative pressure can be supplied to the suction port using the first and second guide rods, and the number of pipes can be reduced.
(18) Furthermore, a substrate conveyor for conveying the circuit board;
A board stopper that abuts the front edge of the circuit board conveyed by the board conveyor and defines the stop position of the circuit board;
A substrate presser that corrects the warping of the circuit board by contacting the upper surface of the circuit board stopped by the substrate stopper;
A holding member for holding the substrate press together with the substrate stopper;
A holding member lifting device for raising and lowering the holding member;
A moving device capable of moving the holding member lifting device and the holding member to an arbitrary position in a moving plane parallel to the upper surface of the circuit board held by the substrate holding device, and in plan view, The board stopper is positioned on the upstream side in the conveyance direction of the circuit board from the board press, and the lower end of the board press is positioned below the lower end of the board stopper in a side view (paragraphs (3) to (17)). The screen printer according to any one of the items.
According to the feature of the invention according to this item, when the board stopper is lowered at the stop position and the circuit board is stopped, the board holder is behind the board stopper and does not hit the circuit board, and the board holder is lowered. When the circuit board is held down, the board stopper is above the board hold-up and does not hit the circuit board and does not interfere with each other. Therefore, the substrate stopper and the substrate presser can be moved up and down by the common lifting device and moved by the common moving device, and the screen printing machine can be configured simply and inexpensively.
The features described in this section can be adopted independently of the features described in any of the items (3) to (17).
(19) The mask support device includes:
A mask support device body;
A movable mask support member having a mask support surface that is held by the mask support device body so as to be relatively movable in a direction parallel to the mask and supports the mask;
A screen printing machine according to any one of (3) to (18), including a mask support member fixing device that fixes the movable mask support member to the mask support device main body.
At least during printing, the movable mask support member is fixed to the main body of the mask support device, so that the mask can be stably supported, and printing accuracy is improved.
The features described in this section can be adopted independently of the features described in any of the items (3) to (18).
(20) The mask support member fixing device includes:
A pad having a contact surface in contact with the mask support device body;
Pad movement which is provided on the movable mask support member and holds the pad movably in a direction intersecting the contact surface, and moves the pad in a direction in which the contact surface contacts and separates from the mask support device main body. A screen printer according to (19), comprising:
It is desirable to provide a suction port that opens on the contact surface of the pad and a negative pressure supply device that supplies a negative pressure to the suction port. The pad is positively fixed to the mask support device main body by the negative pressure.
(21) The mask support device includes: (a) a mask support member including a support surface that supports the lower surface of the mask from below; and a suction port that is opened on the support surface; and (b) the suction port. A screen printing machine according to any one of (3) to (20), comprising a vacuum device for supplying vacuum to the apparatus.
The mask is reliably supported by the mask support member, and displacement of the mask with respect to the mask support member is prevented.
The features described in this section can be adopted independently of the features described in any of the items (3) to (20).
(22) Further, by controlling the substrate holding device lifting device and the mask supporting device lifting device, the mask supporting device and the substrate holding device can be integrated with a distance allowed by elastic deformation of the mask. The screen printing machine according to (21), further including an inertial force generation control unit that lowers and stops suddenly, and generates an inertial force in a direction toward the circuit board on the printing material in the opening of the mask.
The mask is lowered together with the circuit board while being in contact with the circuit board, and is abruptly stopped. As a result, the adhesion of the printing material to the circuit board is increased, and the mask is easily removed from the through hole.
If the mask is held by the mask support member by means other than vacuum suction, the feature described in this section can be employed independently from the feature described in section (21).
(23) A screen printing method in which a printing material is moved by a squeegee along the upper surface of a horizontal mask in which a plurality of through holes are formed, and the printing material is printed on a circuit board through the through holes of the mask. ,
A filling step of filling the through-hole of the mask with the printing material by the squeegee;
After the filling process, the mask and the circuit board are integrally lowered and suddenly stopped to generate an inertial force in the direction toward the circuit board on the printing material in the opening of the mask, An adhesion increasing step for increasing the adhesion of the printing material to the circuit board;
A screen-separating step of separating the mask and the circuit board after the step of increasing the adhesion force, and releasing the printing agent attached to the circuit board from the through hole. Method.
Due to the increased adhesion of the printing material to the circuit board, the through-hole is satisfactorily extracted.

1 is a front view schematically showing a screen printing machine according to an embodiment. It is a top view which shows the mask used in the said screen printer. It is a side view which shows the mask support apparatus and substrate holding apparatus of the said screen printer. It is a perspective view which shows the said mask support apparatus and a substrate holding device. It is a top view which shows the movable mask support member of the said mask support apparatus with a clamp member. It is a top view which shows the clamp member drive device of the side clamp apparatus of the said board | substrate holding apparatus. It is a front view which shows the said clamp member drive device. It is a front view which expands and shows a part of said clamp member drive device. It is a perspective view which shows the mask support member fixing device of the said screen printer. It is front sectional drawing which shows a part of substrate support apparatus of the said board | substrate holding apparatus. It is side surface sectional drawing which shows the said mask support apparatus and a substrate holding device. It is a top view which shows the board | substrate stopper, board | substrate holding | suppressing, and moving apparatus of the said screen printer. It is a side view which shows the said board | substrate stopper and board | substrate holding | suppressing. It is a top view which shows the said board | substrate stopper and board | substrate holding | suppressing. It is a block diagram which shows the control apparatus which controls the said screen printer. It is a figure explaining holding | maintenance etc. of the circuit board by the said board | substrate holding apparatus. It is a side view which shows the up-and-down clamp apparatus of the screen printer which is another embodiment.

Hereinafter, embodiments of the claimable invention will be described in detail with reference to the drawings. In addition to the following embodiments, the claimable invention can be implemented in various modifications based on the knowledge of those skilled in the art, including the aspects described in the above [Aspect of the Invention] section. .

FIG. 1 shows a screen printing machine (hereinafter abbreviated as a printing machine) which is an embodiment of the claimable invention. The printing machine includes a printing machine main body 10, a substrate transfer device 12, a substrate holding device 14, a mask support device 16 (see FIG. 3), a mask holding device 18, a printing device 20, an imaging device 22, and a control device 24 (see FIG. 15). ). The mask holding device 18 is provided on the upper part of the printing machine body 10 and holds the mask 30 in a horizontal posture. As shown in FIG. 2, the mask 30 has a through hole in a portion corresponding to a printing position of a cream-like solder (hereinafter abbreviated as solder) as a printing material on a circuit board 32 (hereinafter abbreviated as a substrate 32). 34 is formed and stretched on the mask frame 36 (see FIG. 1).

As shown in FIG. 1, the printing apparatus 20 includes a pair of squeegee heads 40 (only one is shown in FIG. 1) each holding a squeegee 38, and a squeegee head lifting device that lifts and lowers the squeegee heads 40. 42 and a squeegee head moving device 44 for moving the pair of squeegee heads 40 in the horizontal direction. The squeegee head moving device 44 includes a movable member 45, an electric motor 46, and a feed screw mechanism 48 (see FIG. 15) including a feed screw and a nut. In the present embodiment, the printing apparatus 20 is provided such that the longitudinal direction of the squeegee 38 is parallel to the conveyance direction of the substrate 32 by the substrate conveyance device 12. Orthogonal to each other. In the present embodiment, the conveyance direction is the left-right direction, and the printing direction is the front-rear direction. Both the left-right direction and the front-back direction are horizontal.

A substrate holding device 14 and a mask support device 16 are provided below the mask holding device 18. As shown in FIG. 4, the mask support device main body 60 has a rectangular planar shape and is disposed horizontally, and a pair of movable mask support members 62 and 64 are parallel to the mask 30 on the upper surface thereof. It can be moved in the front-rear direction.

The movable mask support members 62 and 64 are each provided with a gate-shaped leg 66 and a plate-like support 68 as shown in FIG. As shown in FIG. 3, each of the movable mask support members 62 and 64 has a guide 74 in which the engagement blocks 72 of the pair of leg portions 70 of the leg body 66 are provided on the mask support device main body 60 in parallel in the front-rear direction. And is moved by mask support member moving devices 76 and 78. The mask support member moving device 76 includes two air cylinders 80 provided in the mask support device main body 60, and moves the movable mask support member 62 by expansion and contraction of the piston rod. The mask support member moving device 78 will be described later.

Each support 68 of the movable mask support members 62 and 64 is mounted on the beam portion 84 of the leg 66 so as to be rotatable about an axis parallel to the conveying direction, and between the pair of legs 70. A tension coil spring 86 as an elastic member, which is a kind of stretched biasing means, is biased in a direction approaching the beam portion 84. The rotation limit of the support body 68 due to the bias of the spring 86 is defined by the support body 68 coming into contact with the beam portion 84 and is supported in a horizontal posture.

As shown in FIG. 3, the support 68 is protruded from the beam portion 84 toward the other movable mask support member, and the entire upper surface thereof constitutes a mask support surface 90, and the lower surface of the protrusion defines the substrate receiving surface 92. It is composed. Further, the upper part of the side surface of the support body 68 that faces a clamp member, which will be described later, is formed from a multi-order function or a trigonometric function curve over the entire longitudinal direction of the support body 68 as shown in the movable mask support member 62 in FIG. It is a curved side surface 94 which is gently curved into a convex shape and is inclined with respect to the longitudinal direction of the squeegee 38. The lower portion of the side surface of the support body 68 is retracted from both ends of the inclined side surface 94 to the opposite side of the clamp member, and is formed as a single parallel side surface 96 parallel to the longitudinal direction of the squeegee 38. The edges of the substrate receiving surface 92 are defined by parallel side surfaces 96 and extend parallel to the side edges of the substrate 32. The support body 68 is formed with a plurality of suction ports 98 opened in the mask support surface 90. The suction port 98 is formed through the support 68 in the thickness direction, and as shown in FIG. 3, negative pressure is applied from the vacuum device 100 to the beam portion 84 through a passage 99 formed in the upper surface thereof. Supplied.

The mask support device 16 is moved up and down by the mask support device lifting device 120. The mask support lifting / lowering device 120 includes a guide device 122 and a lifting / lowering driving device 124. As shown in FIG. 4, the guide device 122 is provided in a hollow guide rod 126 that extends downward from the central portion of the mask support device main body 60 and a bed 128 of the printing press main body 10. And a guide sleeve 130 slidably fitted thereto. In the present embodiment, the guide rod 126 and the guide sleeve 130 have a circular cross-sectional shape.

The elevating drive device 124 includes four feed screws 136, four nuts 138, and a relative rotation device 140 as shown in FIG. The four feed screws 136 are fixed to the four corners of the mask support device main body 60 and extend downward in parallel with the guide rod 126 at each of four positions that are equidistant from the guide rod 126 in the horizontal direction. The relative movement in the axial direction is impossible and the relative rotation is impossible. The four nuts 138 are provided at four positions corresponding to the four feed screws 136 of the bed 128 so as not to be relatively movable in the axial direction and to be relatively rotatable, and are screwed into the four feed screws 136. . The relative rotation device 140 includes an electric motor 142, a plurality of pulleys 144 including four pulleys 144 provided integrally with each of the four nuts 138, and a belt 146 (see FIG. 11) wound around the pulleys 144. The four nuts 138 are simultaneously rotated, the four feed screws 136 are simultaneously moved in the axial direction, and the mask support device 16 is moved up and down with respect to the printing press main body 10 while being guided by the guide device 122.

The substrate holding device 14 includes a substrate support device 150 and a side clamp device 152 as shown in FIG. The side clamp device 152 includes a clamp device body 154, a pair of clamp members 156, 158, and a clamp member driving device 160 (see FIG. 6). The clamp members 156 and 158 each have a longitudinal shape, and are attached to the side frames 162 and 164. The clamp device main body 154 has a rectangular planar shape, the side frame 162 is fixed on the clamp device main body 154 in parallel with the transport direction, and the clamp member 156 is fixed to the upper end of the clamp device 156 in a posture in which the longitudinal direction is parallel to the transport direction. Has been. Hereinafter, the clamp member 156 may be referred to as a fixed clamp member. As shown in FIG. 5, the fixed clamp member 156 has a flat clamp surface 166 parallel to the conveying direction on the side surface facing the clamp member 158, and the upper part of the back surface has a curvature corresponding to the inclined side surface 94. The inclined side surface 168 is parallel to the inclined side surface 94.

The side frame 164 has a gate shape as shown in FIG. 4, and the engagement blocks 178 of the pair of leg portions 176 are respectively provided in parallel to the front and rear direction of the clamp device body 154 as shown in FIG. The guide 180 is movably fitted. The side frame 164 is moved by the transfer width changing device 184, the interval with the side frame 162 is changed, and the substrate transfer width is changed. The transport width changing device 184 includes an electric motor 182 as a driving source, and a plurality of pulleys 186 and a belt 188, respectively. The rotation of the electric motor 182 is converted into a linear motion, and the pair of leg portions 176 of the side frame 164 is provided. And a pair of motion transmission mechanisms 190 for transmitting each of them.

The clamp member 158 is held on the side frame 164 in such a manner that the longitudinal direction is parallel to the transport direction so as to be able to approach and separate from one of both end surfaces of the substrate 32, and is moved by the clamp member driving device 160. Hereinafter, the clamp member 158 may be referred to as a movable clamp member 158. Similar to the fixed clamp member 156, the movable clamp member 158 has a side surface facing the substrate 32 as a clamp surface 212 and an upper portion on the back surface as an inclined side surface 214.

The clamp member driving device 160 includes a pair of driving units 216 as shown in FIGS. These drive units 216 are similarly configured, and are provided symmetrically with respect to a vertical plane parallel to the front-rear direction, and one of them will be described.

The air cylinder 220 as a drive source of the drive unit 216 has a cylinder housing 223 fixed in a posture parallel to the conveying direction in the vicinity of the center portion in the longitudinal direction of the horizontal beam portion 222 of the side frame 164. One end portion of a connecting link 228 is attached to a tip end portion of a piston rod 224 extended to one end portion side in the longitudinal direction via a joint 226 so as to be rotatable around a vertical axis. A support shaft 230 is erected on the other end of the connection link 228, and a roller 232, which is a rotation guide member, is attached to be rotatable about a vertical axis via a bearing.

As shown in FIG. 7, two engagement blocks 240 and 242 are provided symmetrically on the lower part of the back surface of the movable clamp member 158 corresponding to each of the pair of drive units 216. The engagement blocks 240 and 242 are L-shaped, and the engagement block 240 is fixed to one end portion of the movable clamp member 158 in one arm portion 244, and is perpendicular to the support shaft 230 as shown in FIG. It is fitted so as to be capable of relative rotation around the axis.

Further, as shown in FIG. 8, the other arm portion 246 is fitted in a guide groove 248 formed through a guide block 247 fixed to the side frame 164 in the front-rear direction. A plurality of balls 252 in the present embodiment, each having two balls 252, are rotatably held at a distance in the front-rear direction on each of the pair of groove side surfaces of the guide groove 248. Through 252, the engagement block 240 is fitted so as to be movable in a horizontal plane that is a plane perpendicular to the rotation axis of the engagement block 240. Further, the guide block 258 is configured by a vertical end face facing the roller 232 of the guide block 247 and parallel to the front-rear direction. Furthermore, in the present embodiment, as shown in FIG. 6, in a state where the movable clamp member 158 opens the base plate 32, the connection portion with the piston rod 224 that is the output member of the connection link 228, and the engagement block 240. An angle α formed by a straight line connecting two relative rotation axes with the connecting portion and the longitudinal direction of the movable clamp member 158 is 5 degrees.

As shown in FIG. 7, the engagement block 242 is fixed to the movable clamp member 158 in the arm portion 260, and the arm portion 262 is fixed to the side frame 164 in the same manner as the arm portion 246 of the engagement block 240. A guide groove 266 of the guide block 264 is movably fitted in a horizontal plane via a ball (not shown).

When the arm portions 246 of the two engagement blocks 240 fixed to the movable clamp member 158 are fitted into the guide grooves 248 of the guide block 247, the movable clamp member 158 is vertically movable at both longitudinal ends thereof. The movement is restricted and it is prevented from turning around an axis perpendicular to its clamping surface 212. Further, the arm portion 246 is fitted into the guide groove 248 via two balls 252 each in the upper and lower directions, so that the movable clamp member 158 is prevented from turning around an axis parallel to the longitudinal direction. Further, the pair of drive units 216 are provided symmetrically, the guide surfaces 258 of each guide block 247 are opposed to each other, and the two rollers 232 that move together with the movable clamp member 158 are brought into contact with the guide surfaces 258, respectively. The moving direction is restricted to the front-rear direction, that is, the direction perpendicular to the side end surface of the substrate 32. Therefore, the movable clamp member 158 is moved closer to and away from the substrate 32 as the roller 232 is moved forward and backward by the expansion and contraction of the piston rod 224. The stroke end on the separation side of the movable clamp member 158 is determined by the stroke end of the piston.

In the present embodiment, the substrate transfer device 12 is constituted by a substrate conveyor, and as shown in FIG. 3, a belt 270 attached to each of the side frames 162 and 164 so as to be able to circulate, and an electric motor 272 as drive sources, respectively. And two belt circulators 274 that respectively circulate a pair of belts 270.

The mask support member moving device 78 includes two air cylinders 280, and each air cylinder 280 has a pair of legs 70 of the movable mask support member 64 and a pair of side frames 164, as shown in FIG. (Fig. 3 shows one of the air cylinders 280). The cylinder housing 282 of the air cylinder 280 is fixed to the leg part 70 of the movable mask support member 64, and the leg part 176 of the side frame 164 is relative to the tip part of the piston rod 284 in the engaging part 286 in the vertical direction. It is engaged so as to be movable and not relatively movable in the front-rear direction. Therefore, the movable mask support member 64 is moved in the front-rear direction together with the side frame 164 by driving the conveyance width changing device 184, and is moved in the front-rear direction with respect to the side frame 164 and eventually the movable clamp member 158 by the expansion and contraction of the piston rod 284. Moved.

The movable mask support member 64 is fixed to the mask support device main body 60 by the mask support member fixing device 102 as shown in FIG. The mask support member fixing device 102 includes a pad 104 and a pad moving device 106. The pad moving device 106 includes an air cylinder 108 attached vertically to the leg portion 70 of the movable mask support member 64. The piston rod 110 extends downward from the cylinder housing 112, and a pad 104 is attached to the extended end.

The pad 104 is formed of hard rubber in the present embodiment, and a horizontal lower end surface thereof constitutes a contact surface 114 and includes a suction port 116 that opens to the contact surface 114. In the present embodiment, the mask support member fixing device 102 is provided on each of the pair of legs 70 of the movable mask support member 64. The pad 104 is moved up and down by the expansion and contraction of the piston rod 110, and the contact surface 114 is brought into contact with and separated from the horizontal upper surface 118 of the mask support device main body 60. In the contact state, the pad 104 is pressed against the upper surface 118 by the air cylinder 108, and negative pressure is supplied from the vacuum device 100 to the suction port 116 to suck the mask support device main body 60. The movable mask support member 64 is firmly fixed to the mask support device main body 60 by the frictional force obtained between the contact surface 114 and the upper surface 118 by the pressing and suction.

Thereby, it is possible to prevent the position of the movable mask support member 64 from being shifted due to the slack of the belt 188 of the transport width changing device 184 or the like. The engagement portion 286 and the piston rod 284 are engaged with each other in the front-rear direction with high accuracy, and the side frame 164 is allowed to move up and down, but the side frame 164 and the movable mask support member 64 are fixed in the front-rear direction. An equal state is obtained, and the displacement of the side frame 164 is prevented by fixing the movable mask support member 64.

The substrate support apparatus 150 includes an apparatus main body 300 (see FIG. 4), a pin support base 302, and a plurality of support pins 304 (see FIG. 10) as support members. The substrate support device 150 supports the circuit board from below by the support pins 304 and holds it by suction, and is configured in the same manner as the substrate support device described in Japanese Patent Application Laid-Open No. 2002-118399. Explained.

The pin support base 302 includes a pin support surface 310 made of a magnetic material, and is fixed on the apparatus main body 300 having a rectangular planar shape. A plurality of negative pressure supply holes 312 that open to the pin support surface 310 are formed in the pin support base 302, and an on-off valve 314 is provided for each. The mounting seat portion 320 of the support pin 304 is larger than the opening of the negative pressure supply hole 312, and a permanent magnet 322 is provided, and the pin support base is closed in a state of closing the negative pressure supply hole 312 corresponding to the supported location of the substrate 32. It is mounted on 302 and fixed to the pin support 302 by a magnetic force. The on-off valve 314 is opened along with the mounting, and negative pressure is supplied to the suction port 330 opened in the horizontal support surface 328 that is the tip surface of the pin portion 326 through the passage 324 in the support pin 304. . A rubber cup 332 is attached to the tip of the pin portion 326, and leakage of negative pressure is prevented.

The substrate holding device 14 is moved up and down by the substrate holding device lifting device 340. The substrate holding device lifting device 340 includes a lifting drive device 342 as shown in FIG. The lifting drive device 342 includes four nuts 344 and a relative rotation device 346 that are provided on the mask support device main body 60 so as to be rotatable and immovable in the axial direction. The relative rotation device 346 includes an electric motor 350, a plurality of pulleys 352 including a pulley 352 provided integrally with four nuts 344, and a belt 354 wound around the pulleys 352. The nuts 344 are rotated all at once.

The substrate support device 150 is moved up and down with respect to the side clamp device 152 by the lift drive device 362 while being guided by the guide device 360. The guide device 360 and the lift drive device 362 constitute a substrate support device lift device. As shown in FIG. 3, the present guide device 360 is provided at a guide rod 366 extending downward from the center portion of the substrate support device main body 300 and a center portion of the clamp device main body 154, and the guide rod 366 is slid. And a guide sleeve 368 movably fitted thereto. The guide rod 366 protrudes downward from the guide sleeve 368 and is slidably fitted into the guide rod 126. In the present embodiment, the guide rod 366 and the guide sleeve 368 have a circular cross-sectional shape.

As shown in FIG. 4, the lifting drive device 362 includes four feed screws 376, four nuts 378 and a relative rotation device 380. The feed screws 376 are respectively provided at four corners spaced equidistant from the guide rod 366 in the horizontal direction from the guide rod 366 of the substrate support apparatus main body 300, and extend so as to be relatively rotatable downward in parallel with the guide rod 366 and not relatively movable in the axial direction. It has been. The nuts 378 are fixed to the four corners of the clamp device body 154, respectively, and are not rotatable and cannot be moved in the axial direction. Each of the four feed screws 376 is screwed to the nut 378 and is also screwed to the four nuts 344 of the elevating drive device 342. The relative rotation device 380 includes a plurality of pulleys 384 including pulleys 384 provided on electric motors 382 and four feed screws 376 provided on the substrate support device main body 300, and a belt 386 wound around the pulleys 384. In addition, the four feed screws 376 are simultaneously rotated with respect to the four nuts 344 by the movement of the belt 386.

When the nut 344 is rotated by the relative rotation device 346 while the rotation of the four feed screws 376 is stopped, the feed screw 376 is raised and lowered, and the substrate holding device 14 is raised and lowered with respect to the mask support device 16. This elevation is guided by guide rods 366 and 126. The rotation stop state of the four feed screws 376 is obtained by maintaining the rotation stop state by applying a holding torque to the electric motor 382. Further, by rotating the four feed screws 376, the substrate support device 150 is raised and lowered with respect to the side clamp device 152. At this time, holding torque is applied to the electric motor 350, and the four nuts 344 are kept in the rotation stopped state. When the mask support device 16 is raised and lowered, the substrate holding device 14 is raised and lowered together with the mask support device 16. In this embodiment, the guide rod 366 and the guide rod 126 serve as both a guide rod and a guide sleeve of a guide device that guides the elevation of the substrate holding device 14 with respect to the mask support device 16, and guides the substrate holding device elevation device 340. Configure the device. Further, the nut 344 and the relative rotation device 346 together with the feed screw 376 constitute an elevating drive device 342.

In the guide rod 366, a through hole 390 that penetrates in the longitudinal direction is formed as shown in FIG. 11, and the through hole 390 and the internal space 392 of the hollow guide rod 126 constitute an air suction passage 394. Yes. The air suction passage 394 is connected to the suction port 330 through the connection port formed in the substrate support apparatus main body 300, the passage 396 (see FIG. 10) formed in the pin support base 302, the negative pressure supply hole 312, and the passage 324. The negative pressure is supplied from the vacuum device 100 through communication. A ring-shaped holding member 398 is attached to the lower end portion of the guide rod 366, and O- rings 400 and 402, which are types of seal members, are held on the inner peripheral surface and the outer peripheral surface, respectively, and an air suction passage 394 is provided. Is prevented from leaking, and misalignment of the guide rods 126 and 366 is absorbed.

The image pickup device 22 is provided in a portion between the mask holding device 18 and the substrate holding device 14 of the printing press main body 10 as shown in FIG. The imaging device 22 is moved to an arbitrary position in the horizontal plane by the moving device 410, and images the reference mark provided on the lower surface of the mask 30 and the reference mark provided on the upper surface of the substrate 32.

The moving device 410 includes a transport direction moving device 412 and a front-rear direction moving device 414 as shown in FIG. The transport direction moving device 412 includes a movable member 416 and a movable member driving device 418. The movable member driving device 418 includes an electric motor 420 and a feed screw mechanism 426 including a nut 422 and a feed screw 424. The movable member driving device 418 guides the movable member 416 to the guide device 428, and at an arbitrary position in a direction parallel to the transport direction. Move to. The front-rear direction moving device 414 is provided on the movable member 416 and includes a movable member 434 and a movable member driving device 436. The movable member driving device 436 is configured similarly to the movable member driving device 418, and moves the movable member 434 to an arbitrary position in the front-rear direction while guiding the movable member 434 to the guide device 438.

As shown in FIG. 13, a substrate stopper 450 and a substrate pressing member 452 are held and mounted on the movable member 434 by a holding member 454, and are moved on the upper surface of the substrate 32 held by the substrate holding device 14 by the moving device 410. It is moved to an arbitrary position in a horizontal plane that is a parallel movement plane. The holding member 454 is moved up and down by a holding member lifting device 460 provided on the movable member 434, and is moved by the moving device 410 together with the holding member lifting device 460. In the present embodiment, the moving device 410 serves as both the imaging device moving device and the holding member / holding member lifting device moving device. The holding member lifting / lowering device 460 is constituted by an air cylinder provided vertically, and a plate-like holding member 454 is horizontally attached to a lower end portion of a piston rod 464 extending downward from the cylinder housing 462. . By extending and contracting the piston rod 464, the holding member 454 is moved up and down to the upper end position and the lower end position determined by the stroke end of the piston, and the substrate stopper 450 and the substrate presser 452 are moved up and down.

In this embodiment, the substrate stopper 450 has a cylindrical shape and is attached in a state of extending downward from the holding member 454. The substrate presser 452 has a cylindrical shape, and is attached to the holding member 454 while being held by at least one, for example, four, plate-like attachment members 466 in the present embodiment. As shown in FIG. 14, the substrate stopper 450 is positioned upstream of the four substrate holders 452 in the transport direction in plan view, and the lower ends of the four substrate holders 452 are viewed in side view as shown in FIG. All are positioned below the lower end of the substrate stopper 450.

As shown in FIG. 15, the control device 24 is mainly configured by a computer 470, to which an image processing computer 472 and the like are connected, and controls various drive sources such as the electric motor 46 through the drive circuit 474. Many of the electric motors constituting the drive sources of various devices constituting the printing press are constituted by servo motors that are electric rotary motors capable of accurately controlling the rotation angle, and the signal of the encoder 476 is sent to the computer 470. Entered. In this embodiment, the feed screw 136 and the nut 138 as well as various feed screws and nuts are screwed together via a plurality of balls to form a ball screw mechanism, and the pulley 144 and the belt 146 The various pulleys and belts are timing pulleys and timing belts.

Next, the operation will be explained. When the substrate 32 is carried into the printing press, the mask support device 16 is located at the lower end position, and the substrate holding device 14 and the substrate support device 150 are lower end positions with respect to the mask support device 16 and the side clamp device 152, respectively. Located in. The movable mask support members 62 and 64 are located at the mask support position, and the movable mask support member 64 is not fixed to the mask support apparatus main body 60. The mask support position is a position where the movable mask support members 62 and 64 are adjacent to the clamp members 156 and 158 in the horizontal direction and support the mask 30 from below. Further, the movable clamp member 158 is located at a non-clamping position or a separation position where the movable clamping member 158 is separated from the substrate 32 and is not clamped. In this embodiment, the mask support position of the mask support member 64 is a position where the mask support member 64 can enter between the mask support members 62 and 64 even when the movable clamp member 158 is positioned at the non-clamp position.

The substrate transfer device 12 is operated and the substrate 32 is carried in. The substrate stopper 450 is positioned at a preset stop position in the transport direction, and the lower end of the holding member 454 is lowered to the working position where the holding member 454 is positioned in the transport path of the substrate 32. It has been. Therefore, the substrate stopper 450 abuts on the front edge of the substrate 32 (see FIG. 14) and stops at a stop position corresponding to the mask 30.

After the stop, the holding member 454 is moved in a direction in which the substrate stopper 450 is separated from the substrate 32 in the transport direction, and is raised to the rising end position, and the substrate stopper 450 is lifted to the retracted position separated from the transport path. . Then, as shown in FIG. 16A, the holding member 454 is moved to a position where the substrate presser 452 is located above the central portion of the substrate 32.

In this state, the movable mask support members 62 and 64 are moved to the pressing position as shown in FIG. The pressing position is a position where the substrate receiving surface 92 is positioned above the clamp members 156 and 158 and the belt 270. Then, the substrate holding device 14 is raised with respect to the mask support device 16, and the clamp members 156 and 158 are brought into contact with the substrate receiving surface 92 as shown in FIG.

Next, the substrate support device 150 is raised with respect to the side clamp device 152. Thereby, as shown in FIG. 16D, the support pins 304 come into contact with the substrate 32, are lifted from the belt 270, and are brought into contact with the substrate receiving surface 92. The substrate support device 150 is raised to a position where the cup 332 is elastically deformed and the support surface 328 comes into contact with the substrate 32. If the rising distance of the substrate support device 150 is excessive, the support 68 is rotated against the urging force of the spring 86 to escape, and damage to the substrate 32 is avoided.

In this state, the holding member 454 is lowered and the substrate holder 452 is lowered. The substrate presser 452 abuts on the upper surface of the substrate 32 before the holding member 454 reaches the lower end position, and is pressed against the support surface 328 of the support pin 304 as shown in FIG. . At this time, if the substrate 32 has a convex warp upward, it is pressed by the substrate presser 452 to be corrected to a straight posture, and both edges of the substrate 32 are received by the substrate receiving surface 92. When the substrate presser 452 is lowered, the air pressure in the air chamber of the air cylinder constituting the holding member lifting device 460 is warped against the elastic force of the substrate 32 by a pressure control device (not shown). It is controlled to a size suitable for correction.

Next, the pair of drive units 216 are actuated, the movable clamp member 158 is moved closer to the substrate 32, and then the substrate 32 is sandwiched between the fixed clamp member 156 as shown in FIG. Fix it. If the side end surface of the substrate 32 is inclined, the amount of movement of the movable clamp member 158 by the drive of the pair of drive units 216 is different, and the movable clamp member 158 is rotated by the rotation of the engagement block 240 around the support shaft 230. It is rotated around the vertical axis and is pressed along the side end surface of the substrate 32. Further, the force with which the air cylinder 220 pushes the connecting link 228 is reduced, and the movable clamp member 158 clamps the substrate 32 without fear of damage. After clamping, negative pressure is supplied to the support pins 304 to attract the substrate 32 and support it in a horizontal posture by the support surface 328. The support pin 304 is also a holding pin.

After the suction, the substrate holding device 14 is lowered with respect to the mask support device 16 as shown in FIG. 16 (g), and the clamp members 156, 158 and the substrate 32 are separated from the substrate receiving surface 92. Further, the holding member 454 is raised to the raised end position, and the substrate presser 452 is raised to the retracted position and separated from the substrate 32. Then, as shown in FIG. 16 (h), the movable mask support members 62 and 64 are retracted to the mask support position, and the movable mask support member 64 is fixed to the mask support device main body 60. Next, as shown in FIG. 16 (i), the substrate holding device 14 is raised with respect to the mask support device 16, and the clamp members 156 and 158 and the substrate 32 are fitted between the movable mask support members 62 and 64. , Their upper surfaces are located in the same plane as the mask support surface 90. In this state, the inclined side surface 94 and the inclined side surfaces 168 and 214 are close to each other and face each other, but as shown in FIG. 5, the gap between them is inclined with respect to the longitudinal direction of the squeegee 38 in plan view. Therefore, the squeegee 38 does not fall into the gap between the mask support members 62 and 64 and the clamp members 156 and 158 during solder printing.

If the side end surface of the substrate 32 is inclined, the movable clamp member 158 is rotated. The inclination of the movable clamp member 158 in the horizontal plane caused by the rotation is movable with the movable mask support member 64 positioned at the mask support position. Allowed by the gap between the inclined side surfaces 94 and 214 with the clamp member 158, the clamp members 156 and 158 and the substrate 32 can enter between the movable mask support member 64 located at the mask support position. In FIG. 16, the gaps between the substrate 32 and the clamp members 156 and 158 are exaggerated for easy understanding, so that the inclined side surfaces 94, FIG. Although the gap between 214 is shown large, it is actually slightly smaller than that.

After the fitting, the image pickup device 22 is moved, and the marks formed on the mask 30 and the substrate 32 are picked up, and the positional deviation between them is acquired and corrected. These imaging and the like are well known and will not be described. After imaging, the imaging device 22 is moved together with the substrate stopper 450 and the substrate holder 452 from the space between the mask 30 and the substrate 32 in the transport direction and moved to the retracted retreat position.

Then, the mask support device 16 is raised. The substrate holding device 14 is stopped with respect to the mask support device 16 and is lifted together with the mask support device 16, and the mask support surface 90, the clamp members 156 and 158, and the substrate 32 as shown in FIG. Each upper surface is brought into contact with the lower surface of the mask 30. The mask support surface 90 contacts a portion of the lower surface of the mask 30 outside the portion where the clamp members 156 and 158 and the substrate 32 are contacted and separated, and negative pressure is supplied to the suction port 116 to attract the mask 30 from below. And support. Then, the squeegee 38 is brought into contact with the upper surface of the mask 30, the solder is moved along the upper surface, and the through hole 34 is filled.

After printing, the substrate 32 is separated from the mask 30. In the present embodiment, the mask support device 16 is moved down with the movable mask support members 62 and 64 adsorbing the mask 30. The substrate holding device 14 remains elevated with respect to the mask support device 16 and is lowered integrally with the mask support device 16. Therefore, as shown in FIG. 16 (k), the mask 30 is pulled by the movable mask support members 62 and 64 and bent downward, and the substrate 32 is lowered while the mask 30 remains in contact therewith.

The movable mask support members 62 and 64 and the substrate 32 are suddenly stopped in a state where the movable mask support members 62 and 64 and the substrate 32 are integrally lowered by a distance allowed by the elastic deformation of the mask 30. Thereby, an inertial force directed toward the substrate 32 is generated in the solder filled in the through hole 34 and adhered to the substrate 32, and the adhesion force is increased. After the stop, the mask support device 16 is raised integrally with the substrate holding device 14 to the printing position shown in FIG. 16 (j) with the movable mask support members 62 and 64 adsorbing the mask 30. . After rising, the suction of the mask 30 by the movable mask support members 62 and 64 is released. Then, the substrate holding device 14 is lowered with respect to the mask support device 16, and the substrate 32 is separated from the mask 30 at a low speed with the movable mask support members 62 and 64 supporting the mask 30, and attached to the substrate 32. The solder having increased adhesion can be surely pulled out from the through hole 34.

After the separation, the mask support device 16 is lowered at a higher speed than the separation speed of the substrate 32 from the mask 30, and the substrate holding device 14 is also lowered integrally therewith. During this lowering, the clamping of the substrate 32 by the side clamp device 152 is released, the substrate support device 150 is lowered with respect to the side clamp device 152, and the substrate 32 is placed on the belt 270. In the present embodiment, a portion that controls the mask support device lifting device 120 and the substrate holding device lifting device 340 of the control device 24 and generates an inertial force in the direction toward the substrate 32 on the solder in the through hole 34 is an inertial force generation. The control unit is configured. Further, the printing press main body 10 constitutes the first member, the mask support device main body 60 constitutes the second member, the clamp device main body 154 and the substrate support device main body 300 constitute the third member, respectively. 16, the board | substrate support apparatus 150 and the side clamp apparatus 152 comprise the circuit board contact / separation apparatus.

If the circuit board is extremely thin and cannot be side-clamped, the side-clamping step shown in FIG. 16 (f) is omitted, and after the board 32 is pressed by the board presser 452, it is adsorbed by the support pins.

Also, depending on the type of substrate, suction by the support pin is unnecessary, and the support pin does not have a substrate suction function and does not have a cup. In this case, after the substrate is loaded, the substrate support device 150 is raised with respect to the side clamp device 152 to a position where the upper surface of the substrate 32 without warping is located in the same plane as the upper surfaces of the clamp members 156 and 158. Then, the substrate holding device 14 is raised with respect to the mask support device 16, and the clamp members 156 and 158 and the substrate are brought into contact with the substrate receiving surface 92. Thereafter, the substrate holder 452 is lowered to correct the substrate warpage. Then, the substrate is clamped by the clamp members 156 and 158.

The substrate clamping device may be a vertical clamping device. The embodiment will be described with reference to FIG.
The vertical clamp device 500 includes a clamp device body (not shown) similar to the clamp device body 154, a pair of upper clamp members 502 and 504, and a pair of lower clamp members 506 and 508. The upper clamp members 502 and 504 have a longitudinal shape, and the upper clamp member 502 is fixed to the upper end of the side frame 510 fixed to the clamp apparatus main body in a posture in which the longitudinal direction is parallel to the transport direction. Is provided in the clamp device main body so as to be movable in the front-rear direction, and is fixed to the upper end of the beam portion 513 of the side frame 512 having a gate shape in a posture in which the longitudinal direction is parallel to the transport direction. The side frame 512 is moved by the transport width changing device. Each of the upper clamp members 502 and 504 includes clamp portions 516 and 518 that protrude upward from the upper end of the substrate support device 514 from an upper end that extends in parallel with the transport direction. The clamp parts 516 and 518 have a thin plate shape with a long shape. Each of the side frames 510 and 512 is provided with a belt 522 of the substrate transfer device 520 and a belt circulator (not shown) on the side surfaces thereof. In FIG. 17, the side frame 512 is illustrated except for one of the pair of leg portions 524 that support both ends of the beam portion 513.

The lower clamp member 506 has a long plate shape, and is attached to a portion of the substrate support device body 530 facing the clamp portion 516 in a posture in which the longitudinal direction is parallel to the transport direction and rises from the substrate support device body 530. ing. The lower clamp member 508 has a long plate shape, and is fixed to a holding body 532 held by a beam portion 513 so as to be movable up and down in a posture in which the longitudinal direction is parallel to the transport direction and the plate surface is vertical. It is provided below the portion 518. The holding body 532 is biased downward by a compression coil spring 534. The lower end of the holding body 532 by the bias of the spring 534 is defined by a stopper (not shown), and the upper end of the lower clamp member 508 is positioned slightly below the upper surface of the belt 522 at the lower end position. In addition, a plurality of engaging portions 536 are provided on the lower surface of the holding body 532 so as to protrude at a distance in the transport direction.

After carrying in the substrate 32, the substrate support device 514 is raised relative to the vertical clamp device 500. Accordingly, the lower clamp member 506 is raised, and the substrate supporting device main body 530 comes into contact with the engaging portion 536 in the middle of the lower clamp member 506 and raises the lower clamp member 508. The lower clamp members 506 and 508 simultaneously contact the lower surface of the substrate 32, lift the substrate 32 from the belt 522, sandwich it between the clamp portions 516 and 518, and jointly clamp its side ends from above and below, It is supported in a straight line. The lower clamp members 506 and 508 are also substrate support members and constitute the substrate support device 514. In the present embodiment, the movable mask support members 62 and 64 do not need to receive the substrate 32 and are always located at the mask support position. After clamping, the substrate holding device 540 including the upper and lower clamping devices 500 and the substrate supporting device 514 is raised with respect to the mask supporting device 16, and the upper clamp members 502 and 504 and the substrate 32 are located between the pair of mask supporting members 62 and 64. The upper surfaces of the upper clamp members 502 and 504 and the mask support surface 90 are positioned in the same plane.

A lower clamp member of the upper and lower clamp device is detachably provided on a pin support base of a substrate support device provided with a support pin so that at least one of the upper and lower clamps of the circuit board and the support pin is selectively performed. Also good.

14: Substrate holding device 16: Mask supporting device 120: Mask supporting device lifting device 150: Substrate supporting device 152: Side clamp device 340: Substrate holding device lifting device 500: Vertical clamping device

Claims (8)

1. A screen printing machine that moves a printing material by a squeegee along an upper surface of a horizontal mask in which a plurality of through holes are formed, and prints the printing material on a circuit board through the through holes of the mask,
   A circuit board contacting / separating device for contacting and separating the circuit board from the mask, the circuit board contacting / separating device comprising: (a) a first member and a second member that move up and down relative to each other; and (b) a second member. And (c) a plurality of feed screws extending in parallel with the guide rod from the second member at a plurality of positions located on both sides of the guide rod. (D) a guide sleeve provided on the first member and slidably fitted to the guide rod; and (e) provided on the first member and screwed with the plurality of feed screws. A screen printing machine comprising: a plurality of nuts; and (f) a relative rotation device that relatively rotates the plurality of feed screws and the nuts simultaneously.
2. The circuit board contacting / separating device further includes: (g) a third member that moves relative to the second member in the vertical direction; and (h) a guide rod that extends from the third member in the vertical direction. And the guide rod extended from the second member is a hollow guide rod, and the guide rod extended from the third member is slidable inside the hollow guide rod. The screen printer according to claim 1, which is fitted.
3. A screen printing machine that moves a printing material by a squeegee along an upper surface of a horizontal mask in which a plurality of through holes are formed, and prints the printing material on a circuit board through the through holes of the mask,
   A board holding device for holding the circuit board horizontally;
   A substrate holding device lifting device that lifts and lowers the substrate holding device to contact and separate the circuit board from the lower surface of the mask; and
   A mask support device for supporting the mask from below by contacting a portion of the lower surface of the mask that is outside the portion where the circuit board is contacted and separated;
   A mask support lifting device for moving the mask support device up and down to contact and separate the lower surface of the mask;
   And a first supporting device that guides the lifting and lowering of the mask supporting device relative to the screen printing device main body and the mask supporting device ascending and descending with respect to the screen printing device main body. A first lifting / lowering driving device, wherein the substrate holding device lifting / lowering device lifts / lowers the second holding device for guiding the lifting / lowering of the substrate holding device relative to the mask supporting device and the substrate supporting device relative to the mask supporting device. The first guide device includes a second lift driving device, and the first guide device is provided in the screen printing machine main body and the hollow first guide rod extended downward from the center of the mask support device. A first guide sleeve slidably fitted to the first guide rod, wherein the second guide device is a central portion of the substrate holding device A screen printing machine including a second guide rod extending downward from the second guide rod and slidably fitted in the hollow first guide rod.
4. The first elevating drive device is
   A plurality of first feed screws that extend downward from the mask support device in parallel to the first guide rod and in an axially unmovable manner at a plurality of positions located on both sides of the first guide rod; ,
   A plurality of first nuts provided in the screen printing machine main body so as not to move relative to each other in the axial direction and screwed into each of the plurality of first feed screws;
   The screen printing machine according to claim 3, further comprising: a first relative rotating device that relatively rotates the plurality of first feed screws and the plurality of first nuts that are screwed together.
5. The substrate holding device is
   A substrate support device for supporting a lower surface of the circuit board;
   A substrate clamping device for clamping and fixing the circuit board supported by the substrate supporting device;
   A third guide device that guides raising and lowering of the substrate support device relative to the substrate clamp device, and a third elevating drive device that raises and lowers the substrate support device relative to the substrate clamp device, the second guide device and the second 5. The screen printing machine according to claim 3, wherein two lift driving devices are provided between the substrate clamping device and the mask support device.
6. The third guide device is slidably fitted to the third guide rod provided on the substrate clamp device and a third guide rod extending downward from a central portion of the substrate support device. The screen printing machine according to claim 5, further comprising a third guide sleeve, wherein the third guide rod also serves as the second guide rod.
7. The third elevating drive device is
   A plurality of third feed screws extending from the substrate support device in parallel with the third guide rod downward and in an axially unmovable manner at a plurality of positions located on both sides of the third guide rod; ,
   A plurality of third nuts provided in the substrate clamping device so as not to move relative to each other in the axial direction and screwed into each of the plurality of third feed screws;
   A plurality of third feed screws screwed to each other and a third relative rotation device for simultaneously rotating the plurality of third nuts at the same time, and the third feed screw is pivotally connected to the mask support device. A second relative rotation device that is screwed with a second nut that is immovable in the direction and relatively rotates the second nut and the third feed screw, and the second nut and the second relative rotation device. The screen printer according to claim 6, wherein the second elevating drive device is configured in cooperation with the third feed screw.
8. The substrate holding device includes a suction port that is opened in a support surface that supports a circuit board, and a through hole that penetrates the second guide rod in a longitudinal direction is formed in the second guide rod. The screen printing machine according to any one of claims 3 to 7, wherein an air suction passage that communicates with the suction port is formed between the first guide rod and the inner space of the hollow first guide rod.

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