JP4089058B2 - Cleaning device and cleaning method for printing screen - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus and a method for cleaning a screen used for printing.
[0002]
[Prior art]
As a method for forming a circuit pattern on a substrate on which electronic components are mounted, a screen printing method is frequently used. This screen printing method has been required to be highly accurate with the recent increase in the density of component mounting. To that end, clogging of the screen opening, cream solder or conductive material that has turned to the back side, etc. has been required. It is an important factor how reliably the adhesive paste can be removed.
[0003]
FIG. 5 is a side view showing an example of a conventional printing screen cleaning apparatus.
In the printing screen cleaning apparatus 10, a roll paper 11 is suspended between two drive rollers 12, and a substantially central portion of the lower surface of the roll paper 11 is pushed upward by a tip of a supply pipe 14 extending from a solvent tank 13. It is the composition which was made. Further, the vacuum suction mechanism 15 is connected to the vacuum pump 16 and arranged on the roll paper 11 side. And these are comprised by the up-down mechanism 17 so that an up-down movement is possible.
[0004]
An operation example of such a configuration will be described.
After the printing is completed, the screen 1 is moved horizontally above the printing screen cleaning device 10 to start cleaning. First, the roll paper 11 and the vacuum suction mechanism 15 are raised by the up-and-down mechanism 17, and the substantially upper center portion of the roll paper 11 and the suction port 15 a of the vacuum suction mechanism 15 are brought into contact with the back surface of the screen 1. Next, the solvent is supplied from the solvent tank 13 through the supply pipe 14 to the substantially central portion of the lower surface of the roll paper 11, the drive roller 12 is driven to wind up the roll paper 11, and the vacuum pump 16 is driven to suck the suction port. 15a is set to a negative pressure. At the same time, the screen 1 is moved horizontally. As a result, clogged solder or conductive paste clogged in the opening of the screen 1 or turned to the back surface is wiped off from the upper surface of the roll paper 11 and vacuumed from the suction port 15a.
[0005]
[Problems to be solved by the invention]
The conventional printing screen cleaning device 10 described above uses the disposable roll paper 11 for wiping off the deposits on the screen 1, so that the cost is high and it is necessary to discard the used paper. Moreover, since the wiping operation of the deposits on the screen 1 is in a fixed direction with respect to the screen 1, uneven wiping or wiping tends to remain on the screen 1, and the accuracy of screen printing decreases.
[0006]
The present invention is made up of the above-mentioned circumstances, and can remove the adhered matter on the screen at low cost and resource saving without using disposable roll paper, and any wiping operation such as a linear operation or an oblique operation. It is an object of the present invention to provide a printing screen cleaning device and a cleaning method capable of maintaining good screen printing accuracy.
[0007]
[Means for Solving the Problems]
In the present invention, the above object is an apparatus for cleaning a screen used for printing, wherein a wiping portion on which a cloth for wiping off the deposits on the screen is detachably mounted, and the wiping portion are vertically arranged. A first vertical moving unit that moves in the direction, a suction unit that sucks the adhering matter on the screen, a second vertical moving unit that moves the suction unit in the vertical direction, a first vertical moving unit and a suction unit including a wiping unit Bei Eteiru a horizontal moving unit that moves in a horizontal direction a second vertical movement part perpendicular to the vertical direction including the. The horizontal moving unit includes a Y moving table that is movable in a Y direction orthogonal to the vertical direction, and an X that is movably mounted on the Y moving table in a direction orthogonal to the vertical direction and orthogonal to the Y direction. And a moving table. The first vertical moving unit including the wiping unit and the second vertical moving unit including the suction unit are disposed on the X moving table. Then, the first vertical moving unit is operated to raise or lower the wiping unit to contact one surface of the screen, and the horizontal moving unit is operated to horizontally move the wiping unit to wipe off deposits from the screen. Thereafter, the second vertical movement unit is operated to raise or lower the suction unit to contact one surface of the screen, and the horizontal movement unit is operated to horizontally move the suction unit to suck the deposit from the screen. Is achieved.
[0008]
The above-described object is, in the present invention, wipe deposits screen used for printing by wiping unit, by suction by the suction unit, a method for cleaning the screen, the wiper portion The cloth for wiping off the attached material is detachably attached, and the wiping part and the suction part are moved horizontally from the retracted position to the screen, and the wiping part is moved vertically to make contact with the back surface of the screen. Move the part horizontally along the specified path to wipe off the deposits, move the wiping part vertically away from the screen and move the suction part vertically to contact the back of the screen, and move the suction part horizontally to deposit. Is achieved by moving the suction part vertically away from the screen.
[0009]
According to the above configuration, the conventional roll paper type is changed to a detachable waste type so that an arbitrary wiping operation such as a linear operation or an oblique operation can be performed. In addition, the screen printing accuracy can be improved without leaving uneven wiping or wiping.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
Note that the embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these forms.
[0011]
FIG. 1 is a perspective view showing an overall configuration of an embodiment of a printing screen cleaning apparatus of the present invention. The printing screen cleaning apparatus 100 includes a wiping unit 110 that wipes off deposits on the screen 1, a first vertical moving unit 120 that moves the wiping unit 110 in the vertical direction, and a suction unit 130 that sucks deposits on the screen 1. , A second vertical moving unit 140 for moving the suction unit 130 in the vertical direction, a horizontal moving unit 150 for moving the wiping unit 110 and the suction unit 140 in the horizontal direction, a rotating unit 160 for rotating the wiping unit 110, and dropping the solvent The solvent dripping unit is a dripping unit 170 and a control unit 180 that controls the operation of each unit.
[0012]
The printing screen cleaning device 100 having such a configuration is integrally disposed below the screen 1 of a screen printing machine that prints a predetermined pattern on a substrate or the like using cream solder, conductive paste, or the like. By appropriately operating the moving units 120, 140, and 150, the wiping unit 110 and the suction unit 130 are sequentially brought into contact with the back surface of the screen 1 to wipe off and suck the deposits.
[0013]
The wiping portion 110 has a configuration in which a cloth (waste) 112 made of a nonwoven fabric or the like for wiping off deposits on the screen 1 is detachably wound around a prismatic holding member 111 made of plastic. . Both ends of the holding member 111 are rotatably and detachably supported by a rotating portion 160 mounted on the pedestal 113, that is, a movable shaft 162 provided with a spring 161 and a rotating shaft 164 of a step motor 163. According to such a configuration, the wiping surface of the cloth 112 can be changed by driving the step motor 163 and rotating the holding member 111 by a predetermined angle.
[0014]
In addition, the cloth 112 can be replaced by pulling the movable shaft 162 outward and removing it from one end of the holding member 111 and removing the wiping portion 110 from the pedestal 113. The holding member 111 in this example is formed in a quadrangular prism shape, but may be formed in an arbitrary prism shape. Further, instead of the movable shaft 162 provided with the spring 161, an air cylinder or a hydraulic cylinder may be used.
[0015]
The first vertical movement unit 120 includes a pedestal 113 and two air cylinders 121 disposed between the X movement pedestal 151 located below the pedestal 113. Each air cylinder 121 is disposed so as to support the lower portions of both ends of the pedestal 113 such that the Z direction (vertical direction) is the driving direction. According to such a configuration, the wiping unit 110 can be moved up and down by simultaneously driving the air cylinders 121 in the same direction. Instead of the air cylinder 121, a combination of a hydraulic cylinder, a motor, and a ball screw / nut may be used.
[0016]
The suction portion 130 is configured to be fixed to the pedestal 132 so that a hollow prismatic suction port 131 made of plastic faces upward. A vacuum pump 133 is connected to the end of the suction port 131. According to such a configuration, the suction port 131 can be set to a negative pressure by driving the vacuum pump 133.
[0017]
Similarly to the first vertical moving unit 120, the second vertical moving unit 140 is also composed of two air cylinders 141 disposed between the pedestal 132 and the X moving table 151 located below the pedestal 132. . Each air cylinder 141 is arranged so that the Z direction (vertical direction) is the driving direction and supports the lower portions at both ends of the pedestal 132, and the suction part 130 is aligned with the wiping part 110. According to such a configuration, the suction portion 130 can be moved up and down by simultaneously driving the air cylinders 141 in the same direction. Instead of the air cylinder 141, a combination of a hydraulic cylinder, a motor, and a ball screw / nut may be used.
[0018]
The horizontal moving unit 150 includes an X moving table 151 movable in the X direction (horizontal direction), a Y moving table 152 disposed below the X moving table 151 and movable in the Y direction (horizontal direction), An X motor 153 and X ball screws / nuts 154 and 155 for moving the X moving table 151 and a Y motor 156 and Y ball screws / nuts 157 and 158 for moving the Y moving table 152 are included. According to such a configuration, the wiping unit 110 and the suction unit 130 can be horizontally moved simultaneously by appropriately driving the X motor 153 and the Y motor 156. Note that the horizontal moving unit 150 may not be configured as a separate unit, and the horizontal moving unit of the screen printing machine may be used.
[0019]
The dropping unit 170 includes a discharge valve 171 for discharging a solvent supplied from a solvent supply source (not shown) and a nozzle 172 for dropping the solvent. According to such a configuration, the solvent can be evenly spread on the wiping surface of the cloth 112 by dropping the solvent from the nozzle 172 while horizontally moving the wiping portion 110 below the nozzle 172. it can. In addition, you may comprise so that dripping part 170 itself can be horizontally moved independently.
[0020]
The control unit 180 has a function of performing program control on the operations of the wiping unit 110, the first vertical movement unit 120, the suction unit 130, the second vertical movement unit 140, the horizontal movement unit 150, the rotation unit 160, and the dropping unit 170. In particular, the wiping operation range of the wiping unit 110 is set based on the dimension data and imposition data of the substrate that is the printing object.
[0021]
In such a configuration, an example of the operation will be described with reference to FIGS.
In the initial state, the wiping unit 110, the suction unit 130, and the like are at a retracted position, that is, a position that is a predetermined distance in the horizontal direction from the lower side of the screen 1, and the wiping unit 110 is disposed below the dropping unit 170. (A position in FIG. 2). When receiving the wiping start signal from the screen printing machine, the control unit 180 drives the X motor 153 to reciprocate the wiping unit 110 in the X direction (arrow a in FIG. 2A) and at the same time, the discharge valve 171. And the solvent is dripped linearly onto the upper surface of the cloth 112 from the nozzle 172 (arrow b in FIG. 2B). This solvent dripping is essential in the case of wet cleaning, but is omitted in the case of dry cleaning.
[0022]
Next, the control unit 180 drives the Y motor 156 to move the wiping unit 110 and the suction unit 130 horizontally from the retracted position (arrow c in FIG. 2B), and the substrate formed on the screen 1 It is positioned before the area and below the back surface of the screen 1 (hereinafter referred to as a start position) (position B in FIG. 2B). Then, the first vertical movement unit 120 is driven to raise the wiping unit 110 vertically (arrow d in FIG. 2B), and the upper surface of the cloth 112 is brought into contact with the back surface of the screen 1.
[0023]
Next, the control unit 180 drives the X motor 153 and the Y motor 156 to wipe the wiping unit 110 so as to cover the range of the substrate area based on the substrate dimension data and the imposition data. The horizontal movement is performed within the range, and the solder paste attached to the back surface of the screen 1 on the upper surface of the cloth 112 is wiped off to complete the rough wiping. As the wiping operation of the wiping unit 110 at this time, as shown by an arrow e in FIG. 2, the wiping operation is performed by horizontally moving the screen 1 at a predetermined feed pitch and moving substantially parallel to the screen 1, or the arrow in FIG. As shown in f, diagonal operation wiping is performed in which the screen 1 is horizontally moved and wiped obliquely at a predetermined feed pitch. In this case, the process is completed by one rough wiping operation, but an arbitrary number of times can be set.
[0024]
After the rough wiping operation is completed, the control unit 180 drives the first vertical movement unit 120 to lower the wiping unit 110 vertically (arrow g in FIG. 2B), and drives the X motor 153 and the Y motor 156. Then, the wiping unit 110 and the suction unit 130 are moved horizontally and positioned at the start position. Then, the control unit 180 drives the second vertical movement unit 140 to raise the suction unit 130 in the Z direction (arrow h in FIG. 3B), and brings the suction port 131 into contact with the back surface of the screen 1.
[0025]
Then, the control unit 180 drives the Y motor 156 to horizontally operate the suction unit 130 and also drives the vacuum pump 133 to suck the remaining cream solder attached to the back surface of the screen 1 through the suction port 131. Let As the suction operation of the suction unit 130 at this time, as shown by an arrow i in FIG. 3, one-way operation suction is performed in which the suction is performed by moving horizontally in one direction (Y direction) with respect to the screen 1. In this case, the suction operation is completed once, but an arbitrary number of times can be set.
[0026]
After the suction operation is completed, the control unit 180 drives the second vertical movement unit 140 to vertically lower the suction unit 130 (arrow j in FIG. 3B), drives the Y motor 156, As indicated by the arrow k, the wiping unit 110 and the suction unit 130 are moved horizontally and positioned at the start position. Then, the control unit 180 drives the step motor 163 to rotate the wiping unit 110 by 90 °, and replaces the wiping surface of the cloth 112. Then, the first vertical movement unit 120 is driven to raise the wiping unit 110 vertically, the upper surface of the cloth 112 is brought into contact with the back surface of the screen 1, and the wiping operation described above is performed again to complete the finish wiping.
[0027]
In this case, the finishing wiping operation is completed once, but an arbitrary number of times can be set. Further, this finishing wiping may be omitted when the screen 1 can be substantially cleaned only by rough wiping and suction. Thereafter, the control unit 180 drives the Y motor 156 to move the wiping unit 110 and the suction unit 130 horizontally from the start position (arrow 1 in FIG. 2B), and retracts to the retreat position to complete the cleaning. To do. The interval until the next cleaning can be arbitrarily set.
[0028]
Here, the wiping surface used for rough wiping and the wiping surface used for finishing wiping are, for example, rotated after the wiping operation is performed 30 times and rotated to another wiping surface. At this time, if the number of times of wiping is counted and an alarm is sounded when the set number of times is exceeded, the wiping surface can be replaced with certainty. Thus, since the wiping surface can be easily updated, the cleaning efficiency can be improved.
[0029]
Further, after the entire wiping surface is used, the wiping portion 110 is removed, the cloth 112 is peeled off from the holding member 111, a new cloth 112 is wound, and the used cloth 112 is washed. As described above, the cloth 112 can be easily replaced and the cloth 112 can be reused. Therefore, the cleaning efficiency can be improved and the cleaning cost can be reduced.
Further, by making the rotations of the X motor 153 and the Y motor 156 variable, the rough wiping speed and the finishing wiping speed can be set, and the feed pitch can be arbitrarily set.
[0030]
【The invention's effect】
As described above, according to the present invention, screen deposits can be wiped off at low cost and with reduced resources, and the accuracy of screen printing can be kept good.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the overall configuration of an embodiment of a printing screen cleaning apparatus of the present invention.
2 is a first plan view showing an operation example of the printing screen cleaning device of FIG. 1; FIG.
3 is a second plan view showing an operation example of the printing screen cleaning device of FIG. 1; FIG.
4 is a plan view showing another operation example of the printing screen cleaning apparatus of FIG. 1; FIG.
FIG. 5 is a side view showing an example of a conventional printing screen cleaning apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Screen, 100 ... Printing screen cleaning apparatus, 110 ... Wiping part, 111 ... Holding member, 112 ... Cloth (waste), 113 ... Base, 120 ... -1st vertical movement part, 121 ... Air cylinder, 130 ... Suction part, 131 ... Suction port, 132 ... Base, 140 ... 2nd vertical movement part, 141 ... Air cylinder , 150 ... Horizontal moving part, 151 ... X moving table, 152 ... Y moving table, 153 ... X motor, 154 ... X ball screw, 155 ... X ball nut, 156 ... Y motor, 157 ... Y ball screw, 158 ... Y ball nut, 160 ... rotating part, 161 ... spring, 162 ... movable shaft, 163 ... step motor, 164 ... Rotating shaft, 170 ... Drip section, 171, And discharge valve, 172 ... nozzle, 180 ... control unit

Claims (6)

An apparatus for cleaning a screen used for printing,
A wiping portion on which a cloth for wiping off the adhered matter on the screen is detachably attached ;
A first vertical movement unit for moving the wiping unit in a vertical direction;
A suction part for sucking the adhered matter on the screen;
A second vertical movement unit for moving the suction unit in a vertical direction;
A horizontal movement unit that moves the first vertical movement unit including the wiping unit and the second vertical movement unit including the suction unit in a horizontal direction orthogonal to the vertical direction ;
The horizontal movement unit is movable in a Y direction perpendicular to the vertical direction and movable in an X direction perpendicular to the vertical direction and perpendicular to the Y direction. An X moving table to be placed;
The first vertical moving part including the wiping part and the second vertical moving part including the suction part are disposed on the X moving table,
By operating the first vertical moving unit, the wiping unit is raised or lowered to contact one surface of the screen and the horizontal moving unit is operated to horizontally move the wiping unit from the screen. The adhering matter is wiped off, and then the suction unit is moved up and down by operating the second vertical moving unit to contact one surface of the screen and the horizontal moving unit is operated to move the suction unit horizontally. An apparatus for cleaning a printing screen, wherein the adhering matter is sucked from the screen by being moved . The cloth has a plurality of wiping surfaces;
Cleaning device for printing screens according to claim 1, further comprising a rotation unit for changing the surface in contact with the screen of the plurality of wiping surface by Rukoto rotates the wiping portion. The printing screen cleaning device according to claim 1, further comprising a solvent dripping unit that impregnates the wiping unit by dripping the solvent while horizontally moving relative to the wiping unit. It is a method of cleaning the screen by wiping off deposits on the screen used for printing with a wiping unit and sucking with a suction unit,
A cloth for wiping off the deposit is detachably attached to the wiping portion,
Moving the wiping part and the suction part horizontally from the retracted position to the screen;
Move the wiping part vertically to contact the back of the screen,
The wiping part is moved horizontally along a predetermined path to wipe off the deposits,
Move the wiping part vertically away from the screen and move the suction part vertically to contact the back of the screen,
The suction part is moved horizontally to suck the deposit,
A method for cleaning a printing screen, wherein the suction part is moved vertically away from the screen. The cloth has a plurality of wiping surfaces;
The wiping operation by one wiping surface among the plurality of wiping surfaces in the cloth is completed a predetermined number of times, and then the wiping portion is rotated to another wiping surface among the plurality of wiping surfaces in the cloth. The method for cleaning a printing screen according to claim 4 , wherein the printing screen is replaced with a new one. Before closer to the screen the wiper portion from said retracted position, by the dropwise addition of a solvent is impregnated with the solvent to the wiping section, then, according to claim 4, closer to the wiper unit to the screen To clean the screen for printing.

Images