JP2007144689A - Screen printing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide screen printing equipment which enables winding of cleaning paper by a rotation transmission mechanism having a simple structure. <P>SOLUTION: In the screen printing equipment having a cleaning mechanism which conducts cleaning by pressing the cleaning paper against the lower side of a mask plate, a rotation driving mechanism which drives a paper roll 22B to rotate for winding the cleaning paper drawn out from an unused paper roll 22A around a cardboard tube 24 so as to collect the paper is constituted of a motor 41, a roll rotating shaft 40B which has an engagement part 43a engaged with a notch part formed in the end part of the cardboard tube 24 and is rotatable around the axis of the cardboard tube, and a coupling member 42 which transmits the rotary motion of the motor 41 to the roll rotating shaft 40B. According to this constitution, the cleaning paper can be wound by the rotation transmission mechanism having the simple structure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screen printing apparatus that prints paste such as cream solder or conductive paste on a substrate.

  In an electronic component mounting process, screen printing is used as a method for printing paste such as cream solder or conductive paste on a substrate. In this method, a mask plate provided with a pattern hole according to a printing target part is brought into contact with the substrate, a paste is supplied onto the mask plate, and a squeegee is slid on the substrate through the pattern hole. The paste is printed.

  During the printing operation, cream solder that protrudes from the printed area on the substrate adheres to the lower surface of the mask plate, or cream solder that has not been completely transferred onto the substrate remains in the opening of the mask plate. Pollution occurs. Such contamination by cream solder hinders normal printing on the subsequent substrate, and therefore it is necessary to perform cleaning to remove these cream solders.

  For this reason, conventionally, a screen printing apparatus having a cleaning mechanism for removing residual cream solder by wiping the mask plate from the lower surface side using a dedicated cleaning paper is known (for example, see Patent Document 1). In this cleaning mechanism, the cleaning paper is supplied in the form of a paper roll wound around a paper tube. The cleaning paper is pulled out of the paper roll every time a cleaning operation is performed, and used paper after being used for cleaning. The structure which winds up and collect | recovers by a winding mechanism is used. As the winding mechanism, a plurality of rotation forming projection forming members are inserted into the inside from the end of the paper tube and spread outward, so that the rotation is transmitted by friction between the projection forming member and the inner surface of the paper tube. I have to.

When all the cleaning paper wound around the paper roll is used up, a new paper roll is installed, and the roll removal work for removing the paper roll wound around the paper tube from the take-up mechanism is carried out after use. Done. In this roll removing operation, after the projection forming member is shrunk inward inside the paper tube and the rotation transmission from the winding mechanism to the paper tube is released, the used cleaning paper is wound around the paper tube. Remove the paper roll.
JP 2001-287345 A

  However, the cleaning mechanism of the conventional apparatus shown in the above-mentioned patent document example has the following problems regarding the configuration of the rotation transmission mechanism for winding the cleaning paper around the paper tube. In other words, the rotation transmission mechanism employs a configuration in which the protrusion forming member is expanded and contracted in the radial direction of the paper tube as described above, so that the number of components increases and the mechanism becomes complicated, thereby avoiding an increase in apparatus cost. I couldn't. When attaching and detaching the paper tube, a complicated work operation for expanding and contracting the protrusion forming member is required, and it is difficult to easily attach and detach the paper roll.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a screen printing apparatus capable of winding a cleaning paper with a rotation transmission mechanism having a simple configuration.

  The screen printing apparatus of the present invention is a screen printing for printing a paste on a substrate through the pattern hole by bringing the substrate into contact with a mask plate provided with a pattern hole and sliding a squeegee on the mask plate. And a cleaning mechanism for cleaning the mask plate from the lower surface side by wiping the cleaning paper supplied in the form of a paper roll wound around the paper tube against the lower surface of the mask plate by wiping it against the lower surface of the mask plate. In the printing apparatus, the cleaning mechanism collects a first roll mounting portion on which the unused paper roll is rotatably mounted around a paper tube axis, and winds the used cleaning paper around the paper tube. A second paper roll is mounted for rotation about the paper tube axis. A paper guide unit that guides the cleaning paper drawn from the paper roll mounted on the first roll mounting unit to the second roll mounting unit via the cleaning head; A rotation driving mechanism for rotating the paper tube mounted on the roll mounting portion to wind up the cleaning paper, and the rotation driving mechanism includes a rotation driving source and a notch formed at an end of the paper tube. A rotating shaft member that includes an engaging portion that engages with the portion and is rotatable about the paper tube axis; and a rotation transmission mechanism that transmits the rotational motion of the rotation drive source to the rotating shaft member.

  According to the present invention, the rotation drive mechanism for winding the cleaning paper after use is provided with an engaging portion that engages with a notch formed at the end of the paper tube, and is rotatable around the paper tube axis. By configuring the shaft member and the rotation transmission mechanism that transmits the rotational motion of the rotation drive source to the rotation shaft member, the cleaning paper can be wound up by a rotation transmission mechanism having a simple configuration.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 is a front view of a screen printing apparatus according to an embodiment of the present invention, FIG. 2 is a side view of the screen printing apparatus according to an embodiment of the present invention, and FIG. 3 is a screen printing apparatus according to an embodiment of the present invention. FIG. 4 is a diagram illustrating the operation of the screen printing apparatus according to the embodiment of the present invention. FIG. 5 is a diagram illustrating the structure of the cleaning unit of the screen printing apparatus according to the embodiment of the present invention. FIG. 7 is a perspective view of a paper roll used in the cleaning unit of the screen printing apparatus according to the embodiment of the present invention, and FIG. FIG. 9 is a structural explanatory view of a paper roll mounting mechanism in the cleaning unit of the screen printing apparatus of one embodiment, and FIG. 9 is a cleaning unit of the screen printing apparatus of one embodiment of the present invention. It is an explanatory view of a paper roll mounting method in Tsu and.

  First, the structure of the screen printing apparatus will be described with reference to FIG. 1, FIG. 2, and FIG. In FIG. 1, the screen printing apparatus is configured by disposing a screen printing mechanism above a substrate positioning unit 1. The substrate positioning unit 1 is configured by stacking a Y-axis table 2, an X-axis table 3, and a θ-axis table 4, and further combining a first Z-axis table 5 and a second Z-axis table 6 thereon. Yes.

  The configuration of the first Z-axis table 5 will be described. Similarly, on the upper surface side of the horizontal base plate 4 a provided on the upper surface of the θ-axis table 4, the horizontal base plate 5 a is held up and down by an elevating guide mechanism (not shown). The base plate 5a is moved up and down by a Z-axis lifting mechanism configured to rotationally drive a plurality of feed screws 5c through a belt 5d by a motor 5b.

A vertical frame 5e is erected on the base plate 5a, and a substrate transport mechanism 8 is held at the upper end of the vertical frame 5e. The substrate transport mechanism 8 includes two transport rails arranged in parallel to the substrate transport direction (X direction—the direction perpendicular to the paper in FIG. 1), and both end portions of the substrate 10 to be printed by these transport rails. It supports and conveys. By driving the first Z-axis table 5, the substrate 10 held by the substrate transport mechanism 8 can be lifted and lowered with respect to the screen printing mechanism described later together with the transport rail 8. 2 and 3, the substrate transport mechanism 8 extends to the upstream side (left side in FIGS. 2 and 3) and the downstream side, and the substrate 10 carried from the upstream side is transported by the substrate transport mechanism 8. Furthermore, it is positioned by the substrate positioning unit 1. And the board | substrate 10 after printing by the screen printing mechanism mentioned later is carried out downstream by the conveyance rail 8. FIG.

  The configuration of the second Z-axis table 6 will be described. A horizontal base plate 6a is disposed between the substrate transport mechanism 8 and the base plate 5a so as to be movable up and down along a lifting guide mechanism (not shown). The base plate 6a is moved up and down by a Z-axis lifting mechanism configured to rotationally drive a plurality of feed screws 6c through a belt 6d by a motor 6b. On the upper surface of the base plate 6a, there is disposed a substrate lower receiving portion 7 having a lower receiving surface for holding the substrate 10 on the upper surface.

  By driving the second Z-axis table 6, the substrate receiving unit 7 moves up and down with respect to the substrate 10 held by the substrate transport mechanism 8. The substrate receiving portion 7 supports the substrate 10 from the lower surface side when the lower receiving surface of the substrate lower receiving portion 7 contacts the lower surface of the substrate 10. A clamp mechanism 9 is disposed on the upper surface of the substrate transport mechanism 8. The clamp mechanism 9 includes two clamp members 9a that are arranged opposite to each other on the left and right sides, and the substrate 10 is clamped and fixed from both sides by moving the clamp member 9a on one side forward and backward by the drive mechanism 9b.

  Next, the screen printing mechanism disposed above the substrate positioning unit 1 will be described. 1 and 2, a mask plate 12 is extended on the mask frame 11, and the mask plate 12 corresponds to the shape and position of the electrode 10a to be printed on the substrate 10 (see FIG. 3). The pattern hole 12a is provided. A squeegee head 13 is disposed on the mask plate 12. The squeegee head 13 has a configuration in which a squeegee raising / lowering mechanism 15 for raising and lowering the squeegee 16 is disposed on a horizontal plate 14. By driving the squeegee lifting mechanism 15, the squeegee 16 moves up and down and comes into contact with the upper surface of the mask plate 12.

  As shown in FIG. 2, a guide rail 27 is disposed in the Y direction on a bracket 26 disposed on the vertical frame 25, and a slider 28 slidably fitted on the guide rail 27 is provided on the plate 14. Connected to both ends. Thereby, the squeegee head 13 is slidable in the Y direction. The plate 14 is horizontally moved in the Y direction by a squeegee moving means comprising a nut 30, a feed screw 29, and a squeegee moving motor (not shown) that rotationally drives the feed screw 29.

  Next, a cleaning mechanism for cleaning the lower surface of the mask plate 12 will be described. As shown in FIG. 1, in the present embodiment, the cleaning head unit 18 is configured to move integrally with the camera head unit 17 that images the substrate 10 and the mask plate 12. The camera head unit 17 includes a substrate recognition camera 17a for imaging the substrate 10 from above and a mask recognition camera 17b for imaging the mask plate 12 from the lower surface side, and moves the camera head unit 17. Thus, the recognition of the substrate 10 and the recognition of the mask plate 12 can be performed simultaneously.

As shown in FIG. 3, the cleaning head unit 18 is provided with a paper roll 22A in which unused cleaning paper is wound around a horizontal unit base 18a, a paper roll 22B in which used cleaning paper is wound, and a cleaning head 21. The cleaning paper drawn from the paper roll 22 </ b> A is collected by the paper roll 22 </ b> B via the cleaning head 21. The camera head unit 17 and the cleaning head unit 18 are mounted on the head X-axis table 19 and move integrally in the Y direction.

  In FIG. 2, a guide rail 31 is disposed on the vertical frame 25 in the Y direction, and a slider 32 slidably fitted to the guide rail 31 is coupled to the head X-axis table 19 via a bracket 19a. Yes. As a result, the head X-axis table 19 is slidable in the Y direction. The head X-axis table 19 is horizontally moved in the Y direction by a head Y-axis moving mechanism 20 including a nut 34, a feed screw 33, and a head moving motor (not shown) that rotationally drives the feed screw 33. The head X-axis table 19 and the head Y-axis moving mechanism 20 constitute a head moving unit that horizontally moves the camera head unit 17 and the cleaning head unit 18 integrally.

  When the substrate 10 and the mask plate 12 are not recognized by the camera head unit 17 and the mask cleaning by the cleaning head unit 18 is not performed, the camera head unit 17 and the cleaning head unit 18 are as shown in FIG. Both are retracted from the upper side of the substrate positioning unit 1 to the side. Then, when performing mask cleaning, the cleaning head unit 18 is moved downward together with the camera head unit 17 below the mask plate 12, and then the cleaning head 21 is raised. Then, with the cleaning paper 21 pressed against the lower surface of the mask plate 12 by the cleaning head 21, the cleaning head unit 18 is moved horizontally to wipe off the lower surface of the cleaning head 21 for cleaning.

  Accordingly, the cleaning head unit 18 and the head moving means for moving the cleaning head unit 18 press the cleaning paper 23 supplied in a paper roll wound around the paper tube against the lower surface of the mask plate 12 by the cleaning head 21. A cleaning mechanism for cleaning the mask plate 12 from the lower surface side is formed by wiping.

  Next, the printing operation by the screen printing mechanism is described. First, when the substrate 10 is carried into the printing position by the substrate transport mechanism 8, the second Z-axis table 6 is driven to raise the substrate receiving portion 7 and receive the lower surface of the substrate 10. In this state, the substrate positioning unit 1 is driven to align the substrate 10 with the mask plate 12. Thereafter, the first Z-axis table 5 is driven to raise the substrate 10 together with the substrate transport mechanism 8 to contact the lower surface of the mask plate 12, and then the substrate 10 is clamped by the clamp mechanism 9. Thereby, the horizontal position of the board | substrate 10 is fixed in the squeegeeing by the squeegee unit 13. In this state, the squeegee 16 is slid on the mask plate 12 to which the cream solder as paste is supplied, whereby the cream solder is printed on the substrate 10 through the pattern holes 12a.

  Next, the structure of the cleaning head unit 18 will be described with reference to FIGS. FIG. 5 shows a cross section in the Y direction of the cleaning head unit 18 shown in FIG. 3, and the cleaning paper 23 drawn out from the paper roll 22A is guided by a plurality of guide rollers 36 to press the upper surface of the cleaning head 21. The paper roll 22B is wound around the surface. The cleaning head 21 can be moved up and down by a head lifting mechanism 35. In the normal state shown in FIG. 6A, the cleaning head 21 is in a lowered state. During mask cleaning for cleaning the lower surface of the mask plate 12, as shown in FIG. 6B, the head lifting mechanism 35 is driven to raise the cleaning head 21 and press the cleaning paper 23 against the lower surface of the mask plate 12. .

Next, a method for mounting the paper rolls 22A and 22B to the cleaning head unit 18 will be described with reference to FIGS. As shown in FIG. 7, the paper rolls 22A and 22B have a configuration in which a cleaning paper 23 is wound around a hollow paper tube 24, and a new unused cleaning paper 23 is wound around the paper roll 22A. The cleaning paper 23 after being used for cleaning is wound around the roll 22B. At the end 24 a of the paper tube 24, a cutout portion 24 b in which the paper tube 24 is partially cut out is formed at an opposing position of 180 °. The notch 24b is provided to transmit the rotation to the paper tube 24 by a rotation drive mechanism described below.

  As shown in FIG. 8, roll support shafts 40A and 40B each provided with a flange 35 are pivotally supported by the support bracket 18b and the support bracket 18c provided upright on the unit base 18a. The roll support shafts 40A and 40B are inserted through the paper tubes 24 of the paper rolls 22A and 22B, respectively. In this state, the paper rolls 22A and 22B are sandwiched from both sides by the flange 43 and the end plate 45. The rolls 22A and 22B are fixed in the axial direction and are held rotatably around the axis of each paper tube 24, that is, around the paper tube axis.

  The roll support shaft 40A pivotally supported by the support brackets 18b and 18c serves as a first roll mounting portion on which an unused paper roll 22A is rotatably mounted around the paper tube axis. The roll support shaft 40B pivotally supported by the support brackets 18b and 18c has a second paper roll 22B on which the used cleaning paper 23 is wound around the paper tube and collected so as to be rotatable around the paper tube shaft. It is a roll mounting part.

  A motor 41 is disposed on the support bracket 18c at a position coaxial with the roll support shaft 40B. A rotation shaft of the motor 41 is coupled to the roll support shaft 40B via a coupling member 42. By driving the motor 41, the roll support shaft 40B rotates in the take-up direction, whereby the paper tube 24 pulls out the cleaning paper 23 from the paper roll 22A, and cleans it while guiding the drawn cleaning paper 23 by the guide roller 36. The head 21 is rotated and wound around the paper roll 22B. Accordingly, the plurality of guide rollers 36 include paper guide means for guiding the cleaning paper 23 drawn from the paper roll 22A mounted on the first roll mounting portion to the second roll mounting portion via the cleaning head 21. It has become.

  A protruding shaft 44 is coupled to the left end portion of the roll support shaft 40B via a flange 43, and the right side surface of the flange 43 has a convex shape corresponding to the position of the notch 24b provided in the paper tube 24. Engaging portion 43a is provided. In a state where the roll support shaft 40B is inserted into the paper tube 24 and the paper roll 22B is mounted, the engaging portion 43a is fitted into the notch portion 24b. In the present embodiment, an example is shown in which the notches 24b and the engaging portions 43a are provided at a plurality of axially symmetrical locations (here, 2 locations). However, as long as stable rotation transmission is possible, You may make it provide only in one place.

  A fitting convex portion 44a is provided at the distal end portion of the protruding shaft 44 so as to extend in the outer diameter direction. When the protruding shaft 44 is fitted to the coupling member 42, the fitting convex portion 44a is cupped. The ring member 42 is fitted in a fitting groove 42a. As a result, the rotation of the motor 41 is transmitted to the protruding shaft 44, and this rotation is further transmitted to the paper tube 24 via the engaging portion 43a.

In the above configuration, the roll support shaft 40B includes an engaging portion 43a that engages with a notch 24b formed in the end 24a of the paper tube 24, and is a rotating shaft member that is rotatable around the paper tube axis. The coupling member 42 provided with the fitting groove 42a and the projecting shaft 44 provided with the fitting convex portion 44a are a rotation transmission mechanism that transmits the rotational motion of the motor 41 that is a rotational drive source to the roll support shaft 40B. It has become. And motor 41, coupling member 42, flange 4
Reference numeral 3 denotes a rotation drive mechanism that rotates the paper tube mounted on the second roll mounting unit to wind up the cleaning paper 23. As the rotation transmission mechanism, various mechanisms other than the configuration shown in the present embodiment can be used.

  Next, a method for mounting the paper roll 22B to the cleaning head unit 18 will be described with reference to FIG. First, as shown in FIG. 9A, the roll support shaft 40B is inserted from the end 24a side of the paper roll 22B to penetrate the paper tube 24. Next, as shown in FIG. 9B, the flange 43 is pressed against the end portion 24a, the engaging portion 43a is fitted into the cutout portion 24b, and then the end plate 45 is mounted from the shaft end of the roll support shaft 40B. Then, the paper roll 22B is sandwiched between the flange 43 and the end plate 45. Thereby, the position of the paper roll 22B is fixed in the axial direction with respect to the roll support shaft 40B.

  Next, as shown in FIG. 9C, the paper roll 22 </ b> B integrated with the roll support shaft 40 </ b> B is mounted on the cleaning head unit 18. That is, the shaft end of the roll support shaft 40B is fitted into the shaft hole 18d provided in the support bracket 18b, and then the fitting convex portion 44a is fitted into the fitting groove portion 42a, whereby the protruding shaft 44 is coupled to the coupling member. 42 and fit. Thus, the paper roll 22B is mounted on the cleaning head unit 18 in a state where the paper roll 22B can be rotationally driven by the motor 41.

  As described above, in the present embodiment, the engaging portion 43a that engages the notch portion 24b formed in the end portion 24a of the paper tube 24 with the rotation drive mechanism for winding the cleaning paper after use. And a roll support shaft 40B that is rotatable around the paper tube axis, and a rotation transmission mechanism that transmits the rotational motion of the rotational drive source to the roll support shaft 40B. As a result, the rotation transmission mechanism for winding the cleaning paper around the paper tube used in the cleaning mechanism of the conventional apparatus, that is, the configuration in which the protrusion forming member is expanded and contracted in the radial direction of the paper tube is simplified. The rotation can be reliably transmitted by the mechanism, and the roll attaching / detaching operation can be easily performed.

  The screen printing apparatus of the present invention has an effect that the winding of the cleaning paper can be performed with a rotation transmission mechanism having a simple configuration, and screen printing for printing paste such as cream solder or conductive paste on a substrate is effective. Useful in the field.

1 is a front view of a screen printing apparatus according to an embodiment of the present invention. The side view of the screen printing apparatus of one embodiment of this invention The top view of the screen printing apparatus of one embodiment of this invention Operation explanatory diagram of a screen printing apparatus according to an embodiment of the present invention Structure explanatory drawing of the cleaning unit of the screen printing apparatus of one embodiment of the present invention Explanatory drawing of operation | movement of the cleaning unit of the screen printing apparatus of one embodiment of this invention The perspective view of the paper roll used for the cleaning unit of the screen printing apparatus of one embodiment of this invention Structure explanatory drawing of the paper roll mounting mechanism in the cleaning unit of the screen printing apparatus of one embodiment of the present invention Explanatory drawing of the paper roll mounting | wearing method in the cleaning unit of the screen printing apparatus of one embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Board | substrate positioning part 10 Board | substrate 12 Mask plate 12a Pattern hole 13 Squeegee unit 16 Squeegee 18 Cleaning head unit 19 Head X axis table 20 Head Y axis moving mechanism 21 Cleaning head 22A, 22B Paper roll 23 Cleaning paper 24 Paper tube 24b Notch 40A 40B Roll support shaft 41 Motor 42 Coupling member 42a Fitting groove 43a Engaging portion 44 Projection shaft 44a Fitting convex portion

Claims (1)

A screen printing mechanism that prints paste on the substrate through the pattern hole by causing the substrate to contact the mask plate provided with the pattern hole and sliding the squeegee on the mask plate, and wound around a paper tube A cleaning mechanism for cleaning the mask plate from the lower surface side by wiping the cleaning paper supplied in the state of the paper roll pressed against the lower surface of the mask plate by a cleaning head,
The cleaning mechanism includes a first roll mounting portion on which the unused paper roll is rotatably mounted around the paper tube axis, and a paper roll for winding and collecting the used cleaning paper around the paper tube. A second roll mounting portion that is rotatably mounted around the paper tube axis, and a cleaning paper drawn from the paper roll mounted on the first roll mounting portion is passed through the cleaning head to the second roll mounting portion. A paper guide means for guiding to a roll mounting portion; and a rotation drive mechanism for rotating the paper tube mounted on the second roll mounting portion to wind up the cleaning paper,
The rotation drive mechanism includes a rotation drive source, a rotation shaft member that includes an engagement portion that engages with a notch formed at an end portion of the paper tube, and is rotatable around the paper tube axis; and the rotation drive source And a rotation transmission mechanism that transmits the rotational movement of the rotation to the rotary shaft member.

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