JP4910692B2 - Screen printing device - Google Patents

Description

  The present invention relates to a screen printing apparatus.

In the field of electronic component mounting, screen printing apparatuses that print cream solder on the printed surface of a substrate are widely used. The screen printing apparatus is an apparatus for masking the printed surface of a substrate with a mask provided with an arbitrary pattern hole, and pattern printing the cream solder spread on the mask on the printed surface through the pattern hole. This apparatus is provided with a pair of squeegees that slide on the mask, and the cream solder between the squeegees is applied to the pattern holes while flowing on the mask. In order to prevent the cream solder from leaking to both sides of the squeegee while the squeegee is flowing the cream solder, a paste leakage prevention wall is provided on both sides of the squeegee to surround the cream solder from three sides together with the squeegee body. (See Patent Document 1).
JP-A-6-39999

  Since the cream solder deteriorates over time, it is necessary to clean the cream solder adhering to the squeegee, but it is difficult to remove the cream solder adhering to the vicinity of the boundary between the squeegee body and the paste leakage prevention wall. It tends to remain during cleaning. If the deteriorated cream solder is left as it is, it may be mixed in the cream solder to be newly printed, which causes a problem in that the print quality varies or a printing defect occurs.

  However, the conventional solder leakage wall is attached to the squeegee body by a fastening member that requires a tool such as a bolt, and is not easily removable. It was the cause of the residue.

  SUMMARY An advantage of some aspects of the invention is that it provides a screen printing apparatus with improved squeegee cleaning workability.

The screen printing apparatus according to claim 1, wherein the screen printing apparatus includes a squeegee that slides on a surface of a mask, and a paste leakage prevention wall that extends in the sliding direction on both sides of the squeegee. A mounting tool that displaces between a mounting position for mounting the paste leakage preventing wall and a separating position for dismounting, and the paste leakage preventing wall includes an insertion hole that is inserted only when the mounting tool is in the separating position; The paste leakage prevention wall is mounted on the squeegee by displacing the mounting tool inserted into the insertion hole to the mounting position, and the mounting tool is pivotally supported by the squeegee, and the pivoting portion. The mounting position is separated from the mounting position by displacing the position of the operation portion that rotates around the pivot support portion. Displaced and location, said pivot portion further comprising a biasing means for biasing the squeegee side, biasing the paste leakage preventing wall where the operation section is attached to the squeegee to the squeegee side.

A screen printing apparatus according to a second aspect of the present invention is the screen printing apparatus according to the first aspect, further comprising a displacement restricting means for restricting a displacement of the mounting tool at the mounting position .

The screen printing apparatus according to claim 3, wherein the screen printing apparatus includes a squeegee that slides on a surface of a mask, and paste leakage prevention walls that extend in the sliding direction on both sides of the squeegee. A mounting tool that displaces between a mounting position for mounting the paste leakage preventing wall and a separating position for dismounting, and the paste leakage preventing wall includes an insertion hole that is inserted only when the mounting tool is in the separating position; Displacement restricting means for restricting the displacement of the attachment tool at the attachment position by attaching the paste leakage prevention wall to the squeegee by displacing the attachment tool inserted through the insertion hole to the attachment position. It was .

The screen printing apparatus according to claim 4 is the screen printing apparatus according to claim 3 , wherein the wearing tool is pivotally supported by the squeegee, is continuous with the pivotal support part, and the pivotal support part is connected to the pivotal support part. An operation unit provided at a position opposite to each other is provided, and the position of the operation unit that rotates around the pivotal support unit is displaced to displace the mounting position and the disengagement position .

  The screen printing apparatus according to claim 5 is the screen printing apparatus according to any one of claims 1 to 4, further comprising a mounting position regulating unit that regulates a mounting position of the paste leakage prevention wall with respect to the squeegee. .

  According to the present invention, since the paste leakage prevention wall is attached / detached by displacing the mounting tool provided in the squeegee, the attachment / detachment is easy and the cleaning workability is improved.

  A screen printing apparatus according to an embodiment 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 front view of a screen printing apparatus according to an embodiment of the present invention, and FIG. 3 is a squeegee unit according to an embodiment of the present invention. FIG. 4 is an explanatory view showing a method for attaching and detaching a paste leakage prevention wall according to an embodiment of the present invention, and FIG. 5 is an explanatory view showing an operation of the squeegee according to an embodiment of the present invention.

  In FIG. 1, a screen printing apparatus 1 is an apparatus for pattern-printing a paste on the surface of a substrate 3 aligned with a mask 2 in which predetermined pattern holes 2a are formed. The screen printing apparatus 1 includes a holding unit 4 that holds the substrate 3 in a predetermined position, a lifting unit 5 that lifts and lowers the substrate 3 held by the holding unit 4, and contacts and separates the surface of the substrate 3 from the back surface of the mask 2. The support means 6 for supporting the substrate 3 from the back surface, the horizontal movement means 7 for horizontally moving the substrate 3 held by the holding means 4 and aligning the substrate 3 and the mask 2, and the substrate 3 and the mask 2 respectively. The image pickup means 8 for picking up a position recognition mark (not shown) provided and a squeegee unit 9 for filling the pattern hole 2a of the mask 2 with paste.

  The holding means 4 is configured by a clamp mechanism that clamps the substrate 3 from both sides, and holds or releases the substrate 3 by bringing the pair of clampers 4a and 4b close to or away from each other.

  The elevating means 5 is composed of a feed screw mechanism that elevates and lowers the clamp mechanism that constitutes the holding means 4, and masks the surface of the substrate 3 held by the clamp mechanism by switching the rotation of the feed screw 5a in the forward and reverse directions. 2. Contact with and away from the back of 2.

  The support means 6 is composed of a feed screw mechanism that raises and lowers the support block 6 a that is in surface contact with the back surface of the substrate 3, and the surface of the support block 6 a is changed over the surface of the substrate 3 by switching the rotation of the feed screw 6 b in the forward and reverse directions. Contact the back side.

  The horizontal moving means 7 is configured by laminating an X table 7a, a Y table 7b, and a θ table 7c. The horizontal movement means 7 moves and rotates the substrate 3 held by the clamp mechanism in a horizontal plane, and moves the substrate 3 with respect to the fixed mask 2. Position the board and align them.

  The image pickup unit 8 moves between the mask 2 and the substrate 3 and is provided with position recognition marks (not shown) provided on the mask 2 and the substrate 3 by two CCD cameras 8a and 8b arranged in the vertical direction. ). When the relative position between the mask 2 and the substrate 3 is recognized by data processing of the captured image, and the positional deviation between the two is recognized, the horizontal position of the substrate 3 is corrected by the horizontal moving means 7.

The squeegee unit 9 includes a pair of squeegees 9 a and 9 b, elevating mechanisms 9 c and 9 d that raise and lower each squeegee 9 a and 9 b independently, and a horizontal movement that horizontally moves the pair of squeegees 9 a and 9 b along the surface of the mask 2. It is comprised with the mechanism 9e.

  The screen printing apparatus 1 configured as described above performs screen printing as follows. In FIG. 2, the substrate 3 lifted up to a height where the printing surface 3a is at the same level as the surfaces of the clamp plates 4a and 4b is applied to the back surface of the mask 2 while being sandwiched by the clamp plates 4a and 4b from both sides. A squeegee 9a that contacts and slides on the surface of the mask 2 fills the pattern holes 2a with the paste P. When the paste P is filled in all the pattern holes 2a, the sliding of the squeegee 9a is stopped and the substrate 3 is lowered. As a result, the back surface of the mask 2 and the printing surface 3a of the substrate 3 are separated from each other, and the paste P filled in the pattern holes is printed on the printing surface 3a.

  The printed substrate 3 is unloaded from the screen printing apparatus 1, and a new substrate 3 is loaded instead. This new substrate 3 is also subjected to the same screen printing, but since the paste P is moved to one side of the mask 2 by the squeegee 9a, the squeegee 9b slides on the surface of the mask 2 instead of the squeegee 9a. Then, the paste P moved to one side by the squeegee 9a is filled in the pattern hole 2a while moving in the reverse direction along the surface of the mask 2. Thus, screen printing can be performed on the plurality of substrates 3 by sliding the squeegees 9 a and 9 b alternately on the surface of the mask 2 each time a new substrate 3 is carried.

  In FIG. 3, the pair of squeegees 9a and 9b are inclined downward in opposite directions. For this reason, the pressing force acts downward on the paste moved along the surface of the mask 2 by the pair of squeegees 9a and 9b, and the pattern holes are easily filled. On both sides of the squeegees 9a and 9b, a mounting tool 11 for detachably mounting the paste leakage prevention wall 10 is provided.

  The mounting tool 11 is connected to the pivot portion 11b pivotally supported by the pivot pin 11a on the squeegee 9b (the description is omitted because the squeegee 9a has the same configuration), and the pivot portion 11b. And an operation portion 11c provided at a position opposite to each other, and the operator picks up the operation portion 11b with a fingertip and rotates it around the pivotal support portion 11b to be displaced. A spring 11d (see FIG. 4) is wound around the outer periphery of the pivot pin 11a, and the mounting tool 11 is pivoted in a state where the pivot portion 11b is biased toward the squeegee 9b. The paste leakage prevention wall 10 includes an insertion hole 10b through which the mounting tool 11 can be inserted. The insertion hole 10b is opened in a position slightly larger than the projected shape from the side of the mounting tool 11 at the position where the operation portion 11c is substantially horizontal, that is, the disengagement position, as shown in FIG. The insertion device 11 can be inserted only when it is in the detached position.

Therefore, after the mounting tool 11 in the disengaged position is inserted through the insertion hole 10b, as shown in FIG. 4B, when the mounting tool 11 is displaced to a position where the operation portion 11c is substantially vertical, that is, the mounting position. The operation part 11c contacts the paste leakage prevention wall 10, and the paste leakage prevention wall 10 is mounted in a state of being locked to the squeegee 9b by the operation part 11c. Further, the paste leakage preventing wall 10 by the urging force of the spring 11d since it is a state of being urged to the squeegee 9b side, paste leakage preventing walls 10 and squeegee 9b comes into close contact without a gap, leakage of the paste can be prevented.

  In FIG. 5, when the squeegee 9a (9b) slides on the mask 2 in the direction of arrow a (b) to fill the pattern hole 2a with the paste P, the sliding direction (arrow a ( The paste leakage prevention wall 10 extending to b) prevents the paste P from leaking and plays a role of retaining the entire surface in the sliding direction of the squeegee 9a (9b). The end portion 10a in the sliding direction of the paste leakage prevention wall 10 is formed so as to be wider than the width of the squeegee 9a (9b), and there is no spillage when passing the paste P between the pair of squeegees 9a, 9b. It is like that.

  In FIG. 3, the paste leakage prevention wall 10 includes a positioning hole 10c, the squeegee 9b includes a positioning pin 9f, and the paste leakage prevention wall 10 includes a positioning pin 9f as shown in FIG. The squeegee 9b is mounted after being aligned so as to be inserted into the positioning hole 10c. The positioning hole 10c and the positioning pin 9f function as a mounting position restricting means for restricting the mounting position of the paste leakage preventing wall 10 with respect to the squeegee 9b, and when the squeegee 9b slides, the paste leakage preventing wall 10 moves relative to the squeegee 9b. Since there is no displacement, the lower end of the paste leakage prevention wall 10 is not lifted away from the surface of the mask 2 and can be prevented from leaking.

  In FIG. 3, the paste leakage prevention wall 10 is provided with a rotation restricting pin 10d as a displacement restricting means for the attachment tool 11, and as shown in FIG. 4B, the operation portion 11c of the attachment tool 11 in the attachment position. It engages with a rotation restricting groove 11e provided in the. As a result, it is possible to prevent an accident in which the mounting tool 11 is rotated and displaced to the disengagement position due to the influence of vibration or the like while the squeegee 9b is sliding, and the paste leakage prevention wall 10 is dropped. Since the rotation restricting pin 10d is a hemispherical small protrusion, no special force is required to displace the attachment tool 11 from the attachment position to the separation position.

  As described above, in the screen printing apparatus according to the present embodiment, the paste leakage prevention wall can be attached / detached only by the operator's operation of the mounting tool provided in the squeegee, so that the attachment / detachment is easy and the cleaning workability is improved. improves. In addition, the paste leakage prevention wall is fixed without being displaced with respect to the squeegee and is mounted in a state of being in close contact with the gap, so that leakage of the paste can be prevented.

  According to the present invention, since the paste leakage prevention wall is attached / detached by displacing the mounting tool provided in the squeegee, it has the advantages of easy attachment / detachment and improved cleaning workability, and printing in the screen printing field. Useful for quality improvement.

1 is a front view of a screen printing apparatus according to an embodiment of the present invention. 1 is a front view of a screen printing apparatus according to an embodiment of the present invention. The front view of the squeegee unit of one embodiment of this invention Explanatory drawing which shows the attachment or detachment method of the paste leak prevention wall of one embodiment of this invention Explanatory drawing which shows operation | movement of the squeegee of one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen printer 2 Mask 9a, 9b Squeegee 9f Positioning pin 10 Paste leakage prevention wall 10b Insertion hole 10c Positioning hole 10d Rotation restriction pin 11 Mounting tool 11b Pivot part 11c Operation part 11d Spring 11e Rotation restriction groove

Claims (5)

A screen printing apparatus comprising a squeegee that slides on the surface of a mask, and a paste leakage prevention wall that extends in the sliding direction on both sides of the squeegee,
The squeegee includes a mounting tool that is displaced between a mounting position where the paste leakage prevention wall is mounted and a separation position where the paste leakage prevention wall is detached, and the paste leakage prevention wall is inserted only when the mounting tool is in the separation position. The paste leakage prevention wall is mounted on the squeegee by displacing the mounting tool inserted through the insertion hole to the mounting position, and the mounting tool is pivotally supported by the squeegee. An operation part that is continuous with the pivot part and is provided at a position facing the pivot part with the pivot part interposed therebetween, and displaces the position of the operation part that rotates around the pivot part, thereby disposing the mounting position and the disengagement position. displaced, said pivot portion further comprising a biasing means for biasing the squeegee side, biasing the paste leakage preventing wall where the operation section is attached to the squeegee to the squeegee side scree Printing device. The screen printing apparatus according to claim 1, further comprising a displacement regulating unit that regulates a displacement of the wearing tool at the wearing position. A screen printing apparatus comprising a squeegee that slides on the surface of a mask, and a paste leakage prevention wall that extends in the sliding direction on both sides of the squeegee,
The squeegee includes a mounting tool that is displaced between a mounting position where the paste leakage prevention wall is mounted and a separation position where the paste leakage prevention wall is detached, and the paste leakage prevention wall is inserted only when the mounting tool is in the separation position. The paste leakage prevention wall is mounted on the squeegee by displacing the mounting tool inserted through the insertion hole to the mounting position.
A screen printing apparatus further comprising a displacement restricting means for restricting a displacement of the mounting tool at the mounting position. The operation wherein the wearing tool includes a pivot part pivotally supported by the squeegee, and an operation part provided at a position facing the pivot part and facing the pivot part, and rotating around the pivot part. The screen printing apparatus according to claim 3, wherein the screen printing apparatus is displaced to the attachment position and the separation position by displacing the position of the portion.   The screen printing apparatus according to any one of claims 1 to 4, further comprising mounting position restricting means for restricting a mounting position of the paste leakage prevention wall with respect to the squeegee.

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