JP2005199452A - Screen printing equipment and screen printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide screen printing equipment and a screen printing method, which can facilitate the reuse of a cleaning tape, and which enable compatibility between resource saving and laborsaving. <P>SOLUTION: When the cleaning tape 22, which is pulled out from a first tape reel 24 mounted on a delivery side so as to be used for cleaning, is wound around a second tape reel 25 which is mounted on a winding side, it is wound in a winding direction wherein a first surface 22a used for the cleaning of a mask plate 12 serves as the side of an inner peripheral surface. In the use of a second surface 22b after that, the first tape reel 24 and the second tape reel 25 are mutually interchanged, so as to be each mounted on the delivery side or the winding side. This enables the reuse of the cleaning tape 22 without the rewinding of the cleaning tape 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a screen printing apparatus and a screen printing method for printing 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 printing 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 including a cleaning mechanism that removes the remaining cream solder by wiping the mask plate from the lower surface side with a dedicated cleaning tape is known (for example, see Patent Document 1). In this cleaning mechanism, the cleaning tape is supplied while being wound around a reel, and the cleaning tape is pulled out from the supply reel every time a cleaning operation is performed, and the used tape after used for cleaning is collected by the take-up reel. A configuration is used.
JP 2002-254608 A

  Incidentally, some cleaning tapes used in screen printing apparatuses can use both front and back surfaces. However, in the conventional screen printing apparatus, in order to reuse the cleaning tape after using one side, it is necessary to rewind the cleaning tape once wound on the take-up reel to the supply reel side. . For this reason, if the cleaning tape is to be reused, rewinding work takes time and effort, and it is difficult to achieve both resource saving and labor saving.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a screen printing apparatus and a screen printing method that can easily reuse a cleaning tape and can achieve both resource saving and labor saving.

The screen printing apparatus of the present invention is a screen printing unit that prints a paste on a substrate through the pattern hole by bringing a mask plate provided with a pattern hole into contact with the substrate and sliding a squeegee on the mask plate. And a cleaning mechanism that cleans the mask plate from the lower surface side by pressing and wiping the cleaning tape against the lower surface of the mask plate, wherein the cleaning mechanism winds and feeds the cleaning tape. A first tape reel and a second tape reel that are both possible, a cleaning head that slides relative to the mask plate in a state where the cleaning tape is pressed against the mask plate, and a first tape reel. And second tape reel By attaching one of these, the sending-side reel mounting portion that feeds the cleaning tape to the cleaning head and either the first tape reel or the second tape reel are mounted for cleaning by the cleaning head. A take-up reel mounting portion that winds up the used cleaning tape, wherein the take-up reel mounting portion has a cleaning use surface that is pressed against the mask plate by the cleaning head in the cleaning operation. Wind the cleaning tape in the winding direction.

  The screen printing method of the present invention includes a screen printing unit that prints a paste on a substrate through the pattern hole by bringing a mask plate provided with a pattern hole into contact with the substrate and sliding a squeegee on the mask plate. And a cleaning mechanism that cleans the mask plate from the lower surface side by pressing and wiping the cleaning tape against the lower surface of the mask plate, and the cleaning mechanism is capable of both winding and delivering the cleaning tape. One tape reel and a second tape reel, a cleaning head that slides relative to the mask plate in a state where the cleaning tape is pressed against the mask plate, a first tape reel, and a second tape Front by installing any of the reels Winding of the cleaning tape used for cleaning by the cleaning head by mounting a delivery reel mounting portion for sending the cleaning tape to the cleaning head, and mounting either the first tape reel or the second tape reel A screen printing method using a screen printing apparatus including a take-up reel mounting unit, and a step of mounting a first tape reel wound with an unused cleaning tape on the delivery-side reel mounting unit; The cleaning tape sent from the first tape reel is fed to the cleaning head, and the cleaning tape is pressed against the outer peripheral surface side of the cleaning tape wound around the first tape reel against the mask plate. And a process for performing the process on the take-up reel mounting part. A step of winding the used cleaning tape in a winding direction in which the cleaning use surface in the cleaning operation is the inner peripheral surface side, and the first tape reel and the second tape reel. Removing each from the delivery side reel mounting part and the take-up side reel mounting part and replacing them with each other and attaching them to the delivery side reel mounting part and the take-up side reel mounting part respectively; A step of feeding the cleaning tape fed from the tape reel to the cleaning head, and pressing the outer peripheral surface of the cleaning tape in a state wound around the second tape reel against the mask plate to perform cleaning. Including.

  According to the present invention, the cleaning tape pulled out from the first tape reel mounted on the delivery-side reel mounting portion and used for cleaning is removed by the second tape reel mounted on the winding-side reel mounting portion. Winding in the winding direction in which the cleaning use surface pressed against the mask plate by the cleaning head is the inner peripheral surface side, and thereafter, the first tape reel and the second tape reel are interchanged with each other, and the sending side tape reel mounting portion By mounting each on the take-up reel mounting portion, the cleaning tape can be reused without rewinding the cleaning tape.

Next, embodiments of the present invention will be described with reference to the drawings. 1 is a side view of a screen printing apparatus according to an embodiment of the present invention, FIG. 2 is an explanatory view of the structure and operation of a cleaning unit of the screen printing apparatus according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a perspective view of the tape reel in the cleaning unit of the screen printing apparatus according to one embodiment of the present invention, and FIG. 5 is one embodiment of the present invention. FIG. 6 is an explanatory diagram of a tape reel mounting state in the cleaning unit of the screen printing apparatus according to the embodiment of the present invention, and FIGS. It is operation | movement explanatory drawing of the mask cleaning operation | movement in the screen printing method of one embodiment of invention.

  First, the structure of the screen printing apparatus will be described with reference to FIG. In FIG. 1, the screen printing apparatus is configured by disposing a screen printing unit 10 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 placing a Z-axis table 5 thereon. A substrate holder 6 that holds the substrate 8 is provided on the Z-axis table 5. The substrate 8 is carried onto the substrate holding unit 6 by a carry-in conveyor (not shown), and is sandwiched from both sides by the clamper 7 so that the position is fixed.

  The screen printing unit 10 disposed above the substrate positioning unit 1 includes a mask plate 12 extended on a holder frame 11. The mask plate 12 is provided with pattern holes (not shown) corresponding to the printing object. A squeegee head 13 is disposed on the mask plate 12, and the squeegee head 13 has a structure in which a squeegee raising / lowering mechanism 15 for raising and lowering the squeegee 16 is provided on a horizontal plate 14, and is moved horizontally by a moving means (not shown). Move in the direction. 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.

  The squeegee 16 is slid on the mask plate 12 to which the cream solder as the paste is supplied in a state where the Z-axis table 5 is raised and the lower surface of the mask plate 12 is in contact with the substrate 8, thereby forming the pattern holes. Through this, cream solder is printed on the substrate 8. That is, the screen printing unit 10 is a paste on the substrate 8 through the pattern hole by bringing the mask plate 12 provided with the pattern hole into contact with the substrate 8 and sliding the squeegee 16 on the mask plate 12. Print cream solder.

  A cleaning unit 20 is disposed on the side of the substrate positioning unit 1 so as to be movable in the Y direction. The cleaning unit 20 will be described with reference to FIG. As shown in FIG. 2A, the cleaning head 21 is disposed on the upper surface of the main body 20 a of the cleaning unit 20 so as to be movable up and down by a head lifting mechanism 23. The main body 20a is provided with a delivery-side reel mounting portion 26 and a take-up reel mounting portion 27. The sending-side reel mounting portion 26 and the take-up reel mounting portion 27 have a first tape reel 24 and a first tape reel 24, respectively. Two tape reels 25 are mounted.

  The first tape reel 24 and the second tape reel 25 can both wind up and feed out a cleaning tape 22 (hereinafter simply referred to as “tape 22”) used for wiping and cleaning the mask plate 12. It is mounted so as to be interchangeable with either the delivery side reel mounting part 26 or the take-up side reel mounting part 27. The tape 22 has a characteristic capable of adsorbing cream solder or fine solid foreign matters adhering to the mask plate 12, and in the present embodiment, the tape 22 that can be used for cleaning both front and back surfaces is used.

  The tape 22 drawn from the first tape reel 24 mounted on the delivery-side reel mounting unit 26 is fed to the upper surface of the cleaning head 21 through the guide roller 28a, the buffer unit 29, and the guide rollers 28b and 28c sequentially. Further, it is wound around the second tape reel 25 mounted on the winding side reel mounting portion 27 via the guide roller 28d. The buffer unit 29 has a function of giving a predetermined tension to the tape 22 as well as a tape length detection function for ensuring an appropriate buffer length of the drawn tape 22.

In the cleaning operation, as shown in FIG. 2B, the cleaning head 21 is lifted while the cleaning unit 20 is moved below the mask plate 12, and the tape 22 is attached to the mask plate 12 by the upper surface of the cleaning head 21. Press against the bottom. In this state, the lower surface of the mask plate 12 is wiped with the tape 22 by horizontally moving the cleaning unit 20.

  That is, in the above-described cleaning operation, the cleaning head 21 slides relative to the mask plate 12 with the tape 22 pressed against the mask plate 12. The cleaning unit 20 is a cleaning mechanism that cleans the mask plate 12 from the lower surface side by pressing and wiping the tape 22 against the lower surface of the mask plate 12.

  As described above, both the first tape reel 24 and the second tape reel 25 can be mounted on the delivery side reel mounting part 26 and the take-up side reel mounting part 27, and the transmission side reel mounting part. 26 feeds the tape 22 to the cleaning head 21 by mounting either the first tape reel 24 or the second tape reel 25.

  Further, the take-up reel mounting portion 27 winds the tape 22 used for cleaning by the cleaning head 21 by mounting either the first tape reel 24 or the second tape reel 25. When the take-up reel mounting portion 27 winds the tape 22, as described later, the tape 22 is wound in the winding direction in which the cleaning use surface pressed against the mask plate 12 by the cleaning head 21 is the inner peripheral surface side. To take up.

  Next, the structure of the first tape reel 24 and the second tape reel 25 will be described with reference to FIGS. As shown in FIG. 3, the first tape reel 24 and the second tape reel 25 have the same structure, and are used as a pair when mounted on the cleaning unit 20. That is, one is used as the delivery side and the other as the take-up side. In FIG. 3, reference numerals of corresponding elements of the first tape reel 24 and the second tape reel 25 are added, and only the first tape reel 24 will be described in the following description.

  The first tape reel 24 is formed by winding a winding tape 45 obtained by winding a wide tape-shaped tape 22 around a winding core 45a made of paper or resin into a cylindrical shape by two disk-shaped reel plates 40 and 41. The structure is sandwiched from both sides. The reel plates 40 and 41 are respectively provided with hubs 40a and 41a that protrude inward. When the hubs 40a and 41a are fitted to both ends of the winding core 45a, and the male screw portions 40c and 41c provided on the hubs 40a and 41a are screwed into the male screw portions on both ends of the connecting shaft 44, the winding tape 45 is tightened. It is held from both sides by reel plates 40 and 41.

  When the unused winding tape 45 is set on the first tape reel 24, only the winding core 45 a for winding is set on the second tape reel 25. That is, as shown in FIG. 4, the winding core 45a is sandwiched from both sides by reel plates 42 and 43 having the same shape as the reel plates 40 and 41, and the hubs 42a and 43a are fitted to both ends of the winding core 45a. The core 45a is held by the reel plates 42 and 43 from both sides by screwing and tightening the male screw portion of the connecting shaft 44 to the female screw portions 42c and 43c provided on 43a.

Then, the tip of the tape 22 drawn out from the first tape reel 24 is wound around the winding core 45a and fixed by a fixing means such as an adhesive tape, so that the tape 22 becomes the first tape reel 24, the second tape. The reel 25 is connected to the two tape reels. In this state, the first tape reel 24 and the second tape reel 25 have two mounting holes 40b and 42b provided at equal positions on the side surfaces of the reel plates 40 and 42 and the center positions on the side surfaces of the reel plates 41 and 43. The mounting holes 41b and 43b are provided in either the delivery side reel mounting part 26 or the take-up side reel mounting part 27 shown in FIG.

  In FIG. 5, base portions 30A and 30B are fixed to the frame of the main body portion 20a of the cleaning unit 20, and two through holes 30a and 30b are provided at opposing positions in the base portions 30A and 30B, respectively. The two upper and lower through holes 30 a and 30 b coincide with the center positions of the delivery-side reel mounting portion 26 and the take-up reel mounting portion 27.

  At a position corresponding to the take-up reel mounting portion 27 of the base portion 30A, a take-up drive motor 31 is disposed by inserting the rotary shaft 32 through the through hole 30a. A reel support shaft 33 is rotatably supported in the corresponding through hole 30a. A reel holding plate 34 is coupled to each of the rotary shaft 32 and the reel support shaft 33, and the reel holding plate 34 is fitted into any of the two mounting holes 40b and 42b provided in the reel plates 40 and 42, respectively. Two possible mounting pins 34a are provided.

  Reel support shafts 35 are rotatably inserted and slidable at positions corresponding to the delivery side reel mounting portion 26 and the take-up side reel mounting portion 27 of the base portion 30B. A locking portion 35c is provided at the outer end portion of the reel support shaft 35, thereby restraining the sliding displacement of the reel support shaft 35 in the inner direction (the left direction in FIG. 5). A mounting pin 35 a and a flange portion 35 b are provided at the inner end of the reel support shaft 35. The mounting pin 35 a has a shape that fits into mounting holes 41 b and 43 b provided in the reel plates 41 and 43. A compression spring 36 is mounted between the flange portion 35b and the base portion 30B, and the compression spring 36 urges the reel support shaft 35 inward through the flange portion 35b.

  When the first tape reel 24 and the second tape reel 25 are mounted on the delivery side reel mounting portion 26 and the take-up side reel mounting portion 27, first, the mounting pin 35a is inserted into the mounting holes 41b of the reel plates 41 and 43, The reel support shaft 35 is slid against the urging force of the compression spring 36 in the outward direction by being fitted to 43b. Next, as shown in FIG. 6, the mounting pin 34 a is fitted into the two mounting holes 40 b and 42 b of the reel plate 40 and the reel plate 42. Thus, the mounting of the first tape reel 24 and the second tape reel 25 is completed, and the tape 22 supplied from the first tape reel 24 is obtained by rotating the motor 31 in the winding direction in this state. The second tape reel 25 is wound up.

  The screen printing apparatus is configured as described above. Next, a mask cleaning operation in the screen printing method will be described with reference to FIGS. FIG. 7A shows that the first tape reel 24 wound with the unused tape 22 is fed to the delivery side reel mounting portion 26, and the second tape reel 25, which is empty only with the winding core 45a, is taken up. The state where each is mounted on the reel mounting portion 27 is shown.

  The tape 22 pulled out from the first tape reel 24 is fed to the upper surface of the cleaning head 21 and taken up on the second tape reel 25. At this time, as described above, the mask plate 12 is removed during the cleaning operation. The cleaning use surface (here, the first surface 22 a on the upper surface side of the tape 22 on the cleaning head 21) pressed against the lower surface is a tape in the winding direction that is the inner peripheral surface side when the second tape reel 25 is wound. 22 is wound up.

FIG. 7B shows a state when the cleaning operation is being executed. That is, the tape 22 is slid against the mask plate 12 by the cleaning head 21. In the tape 22 used for cleaning, the cleaning use surface side (the first surface 22a with a black circle in the figure) is the inner peripheral surface side, and the second surface 22b side not yet used for cleaning is the outer peripheral surface side. Are wound around the second tape reel 25 sequentially. By continuing this cleaning operation, the winding storage amount of the first tape reel 24 is reduced, and eventually the winding storage amount of the first tape reel 24 is nearly zero as shown in FIG. Become.

In such a state, the tape reel is replaced. That is, as shown in FIG. 8A, first, the first tape reel 24 and the second tape reel 25 are removed from the sending side reel mounting portion 26 and the take-up side reel mounting portion 27, and then to FIG. 8B. As shown, the second tape reel 25 having the first surface 22a wound with the tape 22 that has already been used for cleaning is used as the delivery-side reel mounting portion 26, and the first tape reel 24 that is almost empty is attached. They are mounted on the take-up reel mounting portion 27 while being replaced with each other.

  Then, as shown in FIG. 8C, cleaning using the unused second surface 22b side is performed. That is, the tape 22 is pulled out from the second tape reel 25 on which the tape 22 is wound with the second surface 22b on the outer peripheral surface side, and is fed onto the cleaning head 21 to be masked by the second surface 22b of the tape 22. Clean the lower surface of 12. The tape 22 used for cleaning both the first surface 22a and the second surface 22b is wound around the first tape reel 24 and collected.

  That is, the mask cleaning operation in the above-described screen printing method includes the step of mounting the first tape reel 24 around which the unused tape 22 is wound on the delivery-side reel mounting portion 26 and the first tape reel 24 being fed out. A step of feeding the tape 22 to the cleaning head 21 and pressing the outer peripheral surface side of the tape 22 in a state of being wound around the first tape reel 24 against the mask plate 12 to perform cleaning; and a take-up reel mounting portion A step of winding the tape 22 after use by the second tape reel 25 mounted on 27 in the winding direction in which the cleaning use surface (first surface 22a) in the cleaning operation is the inner peripheral surface side; The tape reel 24 and the second tape reel 25 are removed from the delivery side reel mounting portion 26 and the take-up side reel mounting portion 27, respectively. And the step of mounting the reel 22 on the delivery side reel mounting portion 26 and the reel mounting portion 27 on the take-up reel side, and the tape 22 fed from the second tape reel 25 mounted on the reel-side reel mounting portion 26 as a cleaning head. And the step of pressing the outer peripheral surface side (second surface 22b) of the tape 22 in the state wound around the second tape reel 25 against the mask plate 12 to perform cleaning. Yes.

  By adopting the method as described above, when using a cleaning tape that can be used on both the front and back sides, the tape rewinding operation that is required in the conventional screen printing apparatus, that is, after winding the first side is used. The operation of rewinding the cleaning tape once wound around the take-up reel to the supply reel can be omitted. This makes it possible to achieve both resource saving by using both surfaces of the cleaning tape and labor saving by eliminating the tape rewinding operation.

  The screen printing apparatus and the screen printing method of the present invention have an effect that the cleaning tape can be reused without rewinding the cleaning tape, such as cream solder or conductive paste on the substrate. It is useful in the field of screen printing for printing pastes.

The side view of the screen printing apparatus of one embodiment of this invention Structure and operation explanatory diagram of the cleaning unit of the screen printing apparatus of one embodiment of the present invention Structure explanatory drawing of the tape reel in the cleaning unit of the screen printing apparatus of one embodiment of the present invention The perspective view of the tape reel in the cleaning unit of the screen printing apparatus of one embodiment of this invention Structure explanatory drawing of the reel mounting part in the cleaning unit of the screen printing apparatus of one embodiment of this invention Explanatory drawing of the tape reel mounting state in the cleaning unit of the screen printing apparatus of one embodiment of this invention Operation explanatory diagram of mask cleaning operation in screen printing method of one embodiment of the present invention Operation explanatory diagram of mask cleaning operation in screen printing method of one embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Board | substrate positioning part 8 Board | substrate 10 Screen printing part 12 Mask plate 13 Squeegee head 20 Cleaning unit 21 Cleaning head 22 Cleaning tape 24 1st tape reel 25 2nd tape reel 26 Delivery side reel mounting part 27 Winding side reel mounting part

Claims (2)

A screen printing unit that prints paste on the substrate through the pattern hole by bringing a mask plate provided with a pattern hole into contact with the substrate and sliding a squeegee on the mask plate, and a lower surface of the mask plate A screen printing apparatus having a cleaning mechanism for cleaning the mask plate from the lower surface side by pressing and cleaning the cleaning tape;
The cleaning mechanism includes a first tape reel and a second tape reel that are capable of winding and delivering the cleaning tape, and a relative position to the mask plate in a state where the cleaning tape is pressed against the mask plate. Cleaning head that slides in a moving manner, a delivery-side reel mounting portion that sends out the cleaning tape to the cleaning head by mounting either the first tape reel or the second tape reel, and the first tape A winding-side reel mounting portion that winds up the cleaning tape used for cleaning by the cleaning head by mounting either the reel or the second tape reel, and the winding-side reel mounting portion includes: Cleaning head in the cleaning operation Thus the screen printing apparatus characterized by winding the cleaning tape in the winding direction of the cleaning using surface pressed against the mask plate is the inner circumferential side. A screen printing unit that prints paste on the substrate through the pattern hole by bringing a mask plate provided with a pattern hole into contact with the substrate and sliding a squeegee on the mask plate, and a lower surface of the mask plate A cleaning mechanism for cleaning the mask plate from the lower surface side by pressing and wiping the cleaning tape, and the cleaning mechanism includes a first tape reel and a second tape reel that can both wind and feed the cleaning tape. Mounting a tape reel, a cleaning head that slides relative to the mask plate in a state in which the cleaning tape is pressed against the mask plate, and either the first tape reel or the second tape reel. To remove the cleaning tape. Winding for winding the cleaning tape used for cleaning by the cleaning head by mounting one of the first reel and the second tape reel, and the delivery reel mounting portion that feeds out the cleaning head A screen printing method using a screen printing apparatus having a side reel mounting portion,
A step of mounting a first tape reel wound with an unused cleaning tape on the delivery-side reel mounting portion; a cleaning tape fed from the first tape reel; After cleaning by pressing the outer peripheral surface side of the cleaning tape against the mask plate in a state wound around the tape reel and the second tape reel mounted on the take-up reel mounting portion A step of winding the cleaning tape in the winding direction in which the cleaning use surface in the cleaning operation is the inner peripheral surface side, and the first tape reel and the second tape reel, respectively, the feeding tape reel mounting portion and the winding Remove from the side reel mounting part and replace each other to send reel mounting part and take-up reel mounting part respectively And the cleaning tape in a state where the cleaning tape fed from the second tape reel mounted on the delivery-side reel mounting portion is fed to the cleaning head and wound around the second tape reel. And a step of performing cleaning by pressing the outer peripheral surface side against the mask plate.

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