JP4511010B2 - Screen plate cleaning device for screen printing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screen plate cleaning apparatus in a screen printing machine for printing a printing paste such as a solder paste or an insulating paste through a screen plate having a pattern opening on a substrate such as a printed board, and more particularly to a screen. It is provided on the lower surface side of the plate so as to be movable, and with the movement, the residue of the printing paste attached to the inner surface of the pattern opening of the screen plate and / or the lower surface of the screen plate is removed. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen plate cleaning apparatus having an apparatus main body configured to be removable from below.
[Prior art]
As this type of device, a device body having a suction opening or a suction nozzle is connected to a suction device such as a vacuum pump provided outside the device body through a suction hose or duct, and the operation of the suction device is performed. It is known that the paste residue is sucked into the apparatus main body by the generated suction action and transferred through the suction hose or duct.
[0003]
[Problems to be solved by the invention]
In this type of screen plate cleaning device, the suction removal efficiency of the paste residue attached to the inner surface of the pattern opening of the screen plate is greatly influenced by the magnitude of the suction force acting on the suction nozzle. In the conventional screen plate cleaning apparatus as described above having a configuration in which the apparatus main body is connected to an intake device provided outside thereof via a suction hose or duct, the suction hose or duct (hereinafter referred to as the following) having a required length is used. And the various mounting parts and labor and time required for the installation thereof, and since the energy loss of the air flow due to the friction of the wall surface of the duct is unavoidable, AC motor with strong suction capability that can sufficiently cover the pressure loss due to possible air leakage Must use relatively large air intake device comprising the structure is complicated, inevitably costly.
Further, in this type of known device, the suction nozzle has a single suction portion having a single elongated intake port 3 'as shown in FIG. In this known example, the suction nozzle B 'is attached to the inner surface of the pattern opening S2 of the screen plate S existing in the sweep region of the suction port 3' in accordance with the movement of the suction nozzle B '. Thus, the remaining paste residue can be removed by suction from below the screen plate. In the illustrated example, the cleaning area Z of the screen plate S is wide and substantially coincides with the sweep area of the intake port 3 ′, so that the power of the intake device can be used without waste.
On the other hand, in the case of the screen plate S shown in FIG. 10, the pattern openings S2 are gathered in the central region, and the cleaning required region Z is extremely narrow. Therefore, the single suction part and the intake air shown in FIG. When the intake nozzle B 'having the port 3' is used, the sweep region of the intake port 3 'extends to a range far wider than the cleaning required region Z, so that the power of the intake device is unnecessarily consumed.
[0004]
The present invention has been made to solve the above-described problems of the prior art, and can very efficiently remove the residue of the paste for printing attached to the inner surface of the pattern aperture of the screen plate. The first object of the present invention is to provide a screen plate cleaning device in a screen printing device that can be used effectively without waste and that can use the power of the air intake device without waste. is there.
[0005]
The second object of the present invention is to remove the residue of the printing paste attached to the inner surface of the pattern opening of the screen plate very efficiently and to effectively use the power of the air intake device without waste. And a screen plate cleaning device in a screen printer capable of providing a relatively simple and inexpensive structure capable of sliding and removing the residue of the printing paste attached to the lower surface of the screen plate extremely efficiently. It is to be.
[0006]
[Means for Solving the Problems]
In order to achieve the first object of the present invention, a screen plate cleaning apparatus according to the present invention is a screen plate in a screen printing machine for printing a printing paste through a screen plate having pattern openings on a substrate. A cleaning device is provided on the lower surface side of the screen plate so as to be movable, and with the movement, the residue of the printing paste attached to the inner surface of the pattern opening of the screen plate can be removed by suction. In the apparatus comprising the apparatus main body configured as described above, the apparatus main body has a horizontally long hollow housing in which a plurality of air intake devices are accommodated and disposed, and the same number of suction nozzle portions as the number of the air intake devices. The suction nozzle portions communicated with the suction ports of the suction device through the independent openings formed in the top plate of the hollow housing. It consists with the suction nozzle detachably fixed on the top plate in modal, and is characterized in that it comprises a controller capable of controlling the power of each of the intake system in each separate.
[0007]
In order to achieve the second object of the present invention, a screen plate cleaning apparatus according to the present invention is a screen printer that prints a printing paste on a printing material through a screen plate having pattern openings. A screen plate cleaning device, which is movably provided on the lower surface side of the screen plate, and as it moves, removes the residue of the printing paste attached to the inner surface of the pattern opening of the screen plate by suction. The apparatus main body is configured to have a horizontally long hollow housing in which a plurality of intake devices are accommodated and the same number of independent suction nozzle portions as the number of intake devices. In addition, each suction nozzle portion communicates with each suction port of the intake device through each independent opening formed in the top plate of the hollow housing. A suction nozzle that is detachably fixed on the top plate in a fixed manner, provided with a controller that can individually control the power of each intake device, and when the device main body is moved And a sliding removal means that slides on the lower surface of the screen plate along with the movement so that the residue of the printing paste attached to the lower surface can be removed by sliding. .
[0008]
For other structural features of the screen plate cleaning apparatus according to the present invention, refer to the description of claims 3-7.
[0009]
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings which specifically show the embodiments thereof.
DETAILED DESCRIPTION OF THE INVENTION
[0010]
In the drawings, reference numeral 1 denotes a main body of a screen plate cleaning apparatus according to the present invention. The main body 1 moves up and down to the lower surface S1 side of the screen plate S set on a screen printing machine (not shown) through a screen holder. A solder alloy powder and a liquid flux which are provided so as to be movable back and forth in the front-rear direction and remain attached to the inner surface of the pattern opening S2 of the screen plate S along with the movement in the front-rear direction. A paste R for printing paste (hereinafter referred to as paste residue) R1 such as a solder paste made into a cream by kneading together is sucked and removed from below the lower surface S1 of the screen plate.
[0011]
In the present invention, the apparatus main body 1 includes a horizontally long hollow housing A in which a plurality of intake devices 2 are accommodated, a single or a plurality of intake ports 3 detachably fixed on the hollow housing A, and The suction nozzles B have the same number of suction nozzle portions B1, B2, B3 as the number of the suction devices 2, and each suction nozzle portion B1, B2, B3 is a suction port of each suction device 2. 2A communicates with each other. In the example shown in the drawing, three small axial flow type intake devices 2 each having an impeller directly connected to the output shaft of a small high-speed DC motor are disposed in the hollow housing A along the axis 2A. Further, the suction nozzle B is provided with three independent circular openings 4 surrounding the respective suction openings 2A of the intake device 2 in such a manner that the discharge openings 2B face downward. A flat sheet-like filter 6 for collecting the paste residue R1 removed by suction is interposed on the flat top plate 5 of the hollow housing A provided, and is fixed in a removable manner by a lock mechanism C described later. Yes. Further, the electric motor is configured to be capable of two-speed shifting, and the controller C connected to the outside can adjust the suction air volume of each intake device, and hence the suction force, by changing the rotational speed as necessary. It has been made possible.
[0012]
In the example shown in the figure, the controller C opens and closes a circuit of each motor of the three intake devices 2 as shown in FIG. Three rotation operation knobs C3 capable of changing the number of rotations in two stages of high speed and low speed are provided. In the figure, C4 is a pilot lamp that displays the operation or stop state of each intake device 2.
[0013]
In the illustrated example, the hollow housing A is formed in a rectangular shape, and the front wall A1, the rear wall A2, the left and right side walls A3, A4 are respectively provided with horizontally long window holes 7 as ventilation holes. At the same time, the bottom wall A5 is formed with a large number of exhaust ports 8 for discharging the hot air discharged from the discharge ports 2B of the intake device 2, so that each of the intake devices can be operated during operation. An excessive temperature rise can be prevented. Reference numeral 9 denotes a partition wall provided vertically between the air intake devices 2 in the hollow housing A, and is provided to block mutual interference or amplification of the generated heat or rotating sound. Reference symbol P denotes a packing filled in a gap between the shoulder portion of the casing of each intake device 2 and the top plate 5.
[0014]
In the illustrated example, the suction nozzle B extends along the axis of the hollow housing A, and does not close the suction port 3 with the two partition walls 10 that define the suction portions B1, B2, and B3. The hollow housing is formed of a rectangular mounting plate 12 having a circular opening 12 </ b> A that is connected to the opening 4 and is fixed to the bottom surface thereof. It is attached to the top plate 5 of A as described above.
[0015]
The apparatus main body 1 is provided with sliding removal means that moves integrally with the suction nozzle B so that the paste residue R2 attached to the lower surface S1 of the screen plate can be removed by sliding. The sliding removal means includes a flat top portion 11A of the hollow projection 11 that can slide in contact with the screen plate lower surface S1, and scraped edge portions 11B and 11C formed on both front and rear sides of the top portion 11A. When sliding in a state of being in contact with the screen plate lower surface S1, the paste residue R2 attached to the lower surface of the screen plate is scraped off by the edge portions 11B and 11C. It is configured so that it can be removed.
[0016]
1 to 4, the locking mechanism C described above is formed in the central portion near the end portions of the attachment plate 12 of the suction nozzle B, the filter 6 and the top plate 5 of the hollow housing A, respectively. In the state where the filter 6 and the mounting plate 12 are sequentially superimposed on the top plate 5 in the mounting holes 13, 14, 15, a head screw 16 inserted from above and the mounting holes 13, 14, 15, respectively. And a locking means 17 for releasably locking the screw 16 inserted through the top plate 5 below the central portion of each end portion of the top plate 5. Each locking means 17 includes a planar rectangular frame 18 fixed to the lower surface of the central portion at each end of the top plate 5, a ring 20 formed with a radial arc-shaped cutout groove 19, and a threaded portion at one end. A pair of rods 22, each having a pair 21, and a sliding member 24 in which an engagement piece 23 having an arcuate engagement recess 23A is fixed between the other end portions, two coil springs 25, a handle 26 and two nuts 27, and a pair of rods 22 and 22 of the sliding member 24 are inserted into a pair of through holes 18A and 18A provided horizontally in the frame 18, The engaging piece 23 of the sliding member 24 is inserted into a U-shaped sliding groove 18B formed horizontally from about the half of the frame 18 from the side through which the rod is inserted, and the engaging piece is attached to the frame. Sliding in the notch groove 19 of the ring 20 fitted in the body 18 After the insertion, the ends of the rods 22 and 22 on which the screws 21 are formed are projected outwardly through a pair of small diameter openings 30 and 30 formed in the side walls A3 and A4 of the hollow housing A, The coil springs 25 are respectively compressed on the projecting portions, the handle 26 is fixed, and the nuts 27 are screwed into the threaded portions 21 of the rods 22 for assembly.
[0017]
When the locking means 17 is assembled as described above, the sliding member 24 is biased outward by the two coil springs 25. In this state, the engaging piece 23 of the sliding member 24 is displaced. As shown in FIG. 4, the projection extends inside the rectangular frame 18 and projects into the circular hole 20 ′ of the ring 20 while being fitted in the notch groove 19 of the ring 20. . In this state, when the suction nozzle B is attached to the hollow housing A, the head screw 16 is placed in the state in which the filter 6 and the attachment plate 12 of the suction nozzle B are sequentially stacked on the top plate 5 of the housing. 14 and 15, and the handle 26 is pushed to slide the sliding member 24 inwardly against the elasticity of the spring 25, so that the central axis of the head screw 16 and the central axis of the ring 20 are substantially coincided with each other. In this state, it engages with the thread groove of the threaded portion 16 ′ of the head screw 16 and locks the head screw 16, so that the suction nozzle B is fixed to the hollow housing A very easily. A plurality of retaining pins 28 are formed in the lower surface of the mounting plate 12 of the suction nozzle B, while small holes 29 for press-fitting the retaining pins 28 are formed in the filter 6 and the top plate 5 of the hollow housing A. When the suction nozzle B is attached to the hollow housing A, the filter is deformed by the suction force acting on the filter 6 during suction by pressing the retaining pins 28 into the small holes 29 respectively. The filter 6 can be firmly pressure-bonded between the top plate 5 and the mounting plate 12 so that no air leakage occurs due to displacement.
[0018]
In order to remove the suction nozzle B fixed to the hollow housing A as described above, the handle 26 is pushed and the sliding member 24 is slid inward against the elasticity of the spring 25. Since the joining piece 23 is released from the screw groove of the head screw 16 to release the locking, it is only necessary to pull out the head screw 16 upward, and thereby the suction nozzle B can be removed very easily. .
[0019]
The screen plate cleaning device configured as described above is operated to clean a screen plate soiled by printing after completion of each or a plurality of screen printing steps, and the screen plate S is as shown in FIG. If there is a large cleaning required area Z, all the three intake devices 2 described above are activated. Then, when the apparatus main body 1 is moved in the direction indicated by the arrow X in FIG. 5, that is, in the forward direction with the top 11 </ b> A of the suction nozzle B being in contact with the lower surface S <b> 1 of the screen plate S, the area below the opening S <b> 2 of the screen plate S. When passing, the paste residue R2 that remains attached to the inner surface of the opening S2 due to the strong suction force generated by the operation of the entire suction device is transferred from the suction port 3 of the suction nozzle B to the suction parts B1, B2 and B3 are vigorously sucked and removed, collected by the filter 6 located in the vicinity of the suction port 2A of the air intake device, and the paste residue R1 attached to the screen plate lower surface S1 is removed from the device body 1 Is removed very efficiently by the scraping edge portion 11B on the front side of the suction nozzle B. In this case, the rotation of each motor of the suction device 2 is appropriately shifted by operating the controller C in accordance with the arrangement state of the pattern openings S2 of the screen plate S, the size thereof, the nature or hardness of the paste residue R2, and the like. Thus, the suction force acting on the suction nozzle B or the suction flow velocity flowing through the intake port 3 can be appropriately adjusted.
[0020]
FIG. 6 shows how the paste residues R2 and R1 are removed when the apparatus main body 1 is moved in the direction of the arrow Y, that is, rearward, and the contents and modes of the operation are the same as those described above. Therefore, the explanation is omitted.
[0021]
Next, when the cleaning required area Z of the screen plate S is extremely narrow compared with the sweep region of the entire length of the intake port 3, for example, as shown in FIG. 10, the pattern openings S2 of the screen plate S gather in the central region. In the case where it exists in the sweep region by the suction port 3 portion of the suction part B2 at the center of the suction nozzle B, it is not necessary to start all three suction devices 2, and 1 corresponding to the suction part B2 If only one intake device 2 is activated, and the area Z requiring cleaning exists in the sweep area by the intake port portion of the left or right suction part B1 or B3, it corresponds to the intake part. It is only necessary to operate one intake device 2 to be operated.
[0022]
1 to 6, the suction nozzle B is shown as having a single straight inlet 3, and FIG. 7 is shown as having two straight inlets 3. It may be provided with a plurality of air inlets having different shapes from the normal shape, and the mounting plate 12 for mounting it on the hollow housing A can be standardized in shape, dimensions, etc. In this case, since compatibility is given, it becomes possible to select and use a desired one among them as necessary. In this case, the lock mechanism C described above is a kind of so-called one-touch type lock mechanism that is extremely easy to operate as described above. Therefore, if this is used, the suction nozzle B and the filter 6 that are easily soiled by the suction of paste residue are used. Not only is it extremely convenient for cleaning and replacement, but it is also very convenient for the selective replacement work of a suction nozzle that is provided with compatibility.
[0023]
As described above, the present invention has been described in detail with reference to the drawings specifically showing the embodiment thereof, but the present invention is not limited to the illustrated embodiment, and within the scope of the claims, This can be implemented with various modifications.
[0024]
As described above, according to the present invention, the residue of the printing paste attached to the inner surface of the pattern opening of the screen plate can be suctioned and removed very efficiently, and the power of the intake device can be effectively used without waste. Relatively simple structure that can contribute to the realization of high-precision printing without blurring, blurring, and short-circuiting caused by residual residues in pattern openings, and the improvement of printing work efficiency. A screen plate cleaning device in a screen printing machine that can be provided at low cost can be obtained.
In addition, according to the present invention, it is possible to very efficiently absorb and remove the residue of the printing paste attached to the inner surface of the pattern opening of the screen plate, and to effectively use the power of the intake device without waste. In addition, the printing paste residue attached to the lower surface of the screen plate can also be slid and removed very efficiently, and bleeding, blurring, short-circuiting, etc. caused by residual residues in the pattern openings and on the lower surface of the screen plate Therefore, it is possible to obtain a cleaning device that can contribute to the realization of high-precision printing without any problem and the remarkable improvement in printing work efficiency and which can be provided at a relatively low cost with a relatively simple structure.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view of a screen plate cleaning apparatus body as an example of an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the apparatus main body shown in FIG.
FIG. 3 is an exploded perspective view of a lock mechanism used for detachably fixing a suction nozzle to a hollow housing.
FIG. 4 is another exploded perspective view of the locking mechanism.
FIG. 5 is a partially longitudinal side view showing the operation of the device of the present invention.
FIG. 6 is another partially longitudinal side view showing the operation of the present invention.
FIG. 7 is a plan view of a suction nozzle having two intake ports on a straight line.
FIG. 8 is a perspective view of a controller.
FIG. 9 is a plan view showing a state in which a screen plate having a wide area to be cleaned is cleaned using a suction nozzle having a conventionally known single suction portion and a single elongated suction port.
FIG. 10 is a plan view showing a state in which a screen plate having a narrow area requiring cleaning is cleaned using the suction nozzle according to one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Apparatus main body A Hollow housing B Suction nozzle B1-B3 Suction part C Controller 2 Intake apparatus 2A Intake apparatus intake 3 Intake nozzle intake S Screen plate S1 Screen plate lower surface S2 Pattern opening R1 Paste residue R2 attached to the side surface Paste residue attached to the lower surface of the screen plate 4 Opening 5 Top plate 6 Filter 7 Window hole A5 Bottom wall 8 Exhaust port 11 Hollow protrusion 11B Cutting edge portion 11C Cutting edge portion

Claims (7)

A screen plate cleaning device in a screen printing machine for printing a printing paste through a screen plate having a pattern opening on an object to be printed, which is provided movably on the lower surface side of the screen plate, and with the movement And an apparatus main body configured to suck and remove the residue of the printing paste attached to the inner surface of the pattern opening of the screen plate, wherein the apparatus main body accommodates a plurality of intake devices. Each of the suction devices through the respective independent openings formed in the top plate of the hollow housing. A suction nozzle that is detachably fixed on the top plate in a mode communicating with the suction port, and the power of each intake device Screen plate cleaning device which is characterized in that it comprises a controller capable of controlling separately. A screen plate cleaning device in a screen printing machine for printing a printing paste through a screen plate having a pattern opening on an object to be printed, which is provided movably on the lower surface side of the screen plate, and with the movement And an apparatus main body configured to suck and remove the residue of the printing paste attached to the inner surface of the pattern opening of the screen plate, wherein the apparatus main body accommodates a plurality of intake devices. And a plurality of suction devices which are the same in number as the number of the suction devices, and the suction nozzle portions of the suction devices are respectively opened through the respective independent openings formed in the top plate of the hollow housing. A suction nozzle that is detachably fixed on the top plate in a state of communicating with each suction port; When the apparatus main body is moved, the printing paste residue attached to the lower surface of the screen plate is slidably contacted with the lower surface of the screen plate as it moves. A screen plate cleaning device comprising a sliding removal means adapted to be obtained. The hollow housing is formed in a rectangular shape, and at least both of its front and rear walls have horizontally long window holes as vent holes, and its bottom wall has a large number of air discharged from each discharge port of the intake device. The screen plate cleaning device according to claim 1, wherein an exhaust port is formed. 4. The screen plate cleaning apparatus according to claim 1, wherein the suction nozzle includes a hollow protrusion extending along an axis of the hollow housing, and each suction nozzle portion. 5. The screen plate cleaning device is characterized in that a single or a plurality of air inlets opening toward the lower surface of the screen plate are formed. 5. The screen plate cleaning apparatus according to claim 4, wherein the residue sliding removal means attached to the lower surface of the screen plate is formed on the top of the hollow protrusion that can contact the lower surface of the screen plate, and on both the front and rear sides of the top. A screen plate cleaning device comprising an edge portion. 6. The screen plate cleaning apparatus according to claim 1, wherein one or a plurality of suction nozzles configured to be compatible with the suction nozzles are optionally provided. Plate cleaning device. 7. The screen plate cleaning apparatus according to claim 1, wherein the printing paste is a solder paste in which a solder alloy powder and a liquid flux are kneaded to form a cream.

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