JPS63178047A - Screen printing machine equipped with cleaning mechanism - Google Patents

Abstract

PURPOSE:To suppress the consumption amount of a solvent to the min. and to apply the solvent to a wiping-off material in a linearly uniform state within a short time, by constituting a solvent coating nozzle of an outside pipe wherein a material having liquid absorbability is embedded in a slit and an inside pipe having a plurality of small holes provided to the places not contacting with the substance having liquid absorbability thereof. CONSTITUTION:A solvent coating double nozzle 19 is constituted of an inside pipe 26 having a large number of small holes 27 provided to the bottom part thereof and an outside pipe 23 having felt 29 having liquid absorbability embedded in the slit provided to the upper part thereof. By this structure, a solvent is injected from a large number of the small holes 27 of the inside pipe 26 to be stored in the outside pipe 23, and subsequently almost equally penetrates into the felt 29 having liquid absorbability from the lower part to the upper part thereof over the entire length L thereof. Therefore, the solvent necessary for cleaning can be applied to a wiping-off material in a linearly uniform state within a short time in the width of the felt 29 having liquid absorbability embedded in the slit and the unnecessary solvent is not consumed and, therefore, this cleaning mechanism is economical, safe and sanitary.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention mainly relates to a screen printing machine with a cleaning mechanism for printing cream solder, paste for thick film circuits, etc. on printed circuit boards.

2. Description of the Related Art In recent years, various types of screen printing machines with cleaning mechanisms have been introduced.
There are proposals in the specification of No. 17 and the specification of Japanese Patent Application No. 196168/1983.

These have a structure as shown in FIG. 7, and an example of the above-mentioned conventional screen printing machine with a cleaning mechanism will be described below with reference to the drawings.

FIG. 7 is a schematic diagram of a cleaning mechanism section of a screen printing machine with a cleaning mechanism. If cream solder or the like is printed several times, the cream solder will adhere to the bottom surface of the screen plate 1, so in that case, the bottom surface of the screen plate 1 should be cleaned. The wiping material 2 at the bottom of the screen plate 1 is attached to a take-up roller 3 that slides in the direction of arrow X and a fixed roll 4. At the bottom of the wiping material 2, there is a cylinder 6 that performs vertical and reciprocating motion in the direction of arrow Y, and a cleaning squeegee 6 is fixed to the cylinder 6. The cylinder 5 slides along with the take-up roller 3 at the same speed in the direction of arrow X. Move the cleaning squeegee 6 until it reaches the bottom surface of the screen plate 1, and at that position raise the cleaning squeegee e until it comes into contact with the bottom surface of the screen plate 1. Clean by rubbing the bottom surface in the direction of arrow X. In this case, cleaning is performed on a certain area where the cleaning squeegee 6 is in contact with the wiping material 2. After cleaning, lower the cleaning squeegee 6,
After the squeegee 6 winds up a certain area of the wiping material 2 with the winding roller 3, the winding roller 3 and the cleaning squeegee 6 are placed on the right side (original position) in FIG. 7. If the bottom surface of the screen plate 1 is heavily soiled, a cleaning process is started after applying a solvent to the wiping material 2. A is the solvent application part, the 8th
The figure is an enlarged view of the solvent application part A in FIG. 7 as viewed from arrow B.

In FIG. 8, cylinders 8a and sb that perform vertical and reciprocating movements in the directions of arrows Y a and Y b are fixed to the stand 7, and brackets 9 a and 9 b are attached to the cylinders 8 a and 8 b.
is stuck. 1 nozzle holder on each bracket
0a and 10b are fixed, and the nozzle holder 10
&, Solvent coating-heavy nozzle 11 is attached to 10b. A holding plate 13 is fixed to the brackets 12a and 12b fixed to the table 7, and the holding plate 13 and the solvent coating
A wiping material 2 passes between the heavy nozzles 11. 9 is a detailed partial cross-sectional view of the solvent coating heavy nozzle 11 shown in FIG. 8, and FIG. 10 is a CC cross section of the solvent coating heavy nozzle 11 shown in FIG. As shown in FIG. 10, a liquid-absorbing felt 14 is embedded in a slit provided at the top of the heavy solvent coating nozzle 11. The solvent is supplied from the tube 15 shown in FIG. 9 to the heavy solvent coating nozzle 12 and permeated into the felt 14 having liquid absorbing properties. After the solvent has penetrated into the entire felt 14, the cylinders 8a and sb shown in FIG. The solvent soaked in is applied to the wiping material 2. The lower surface of the screen plate 1 was cleaned with the portion of the wiping material 20 coated with the solvent.

Problems to be Solved by the Invention However, in the above configuration, the solvent is not supplied from one end of the solvent coating heavy nozzle 11 and is allowed to penetrate into the felt 14, which has liquid absorbing properties. As shown in the figure, when the solvent permeates into the liquid-absorbing felt 14, from the solvent supplying side, arrows E and E shown in FIG.
The solvent penetrates into the liquid-absorbing felt 14 in the order of F.

Therefore, by the time the solvent permeates the entirety of the felt 14, which has liquid-absorbing properties, the content of the felt on the supply side exceeds the amount that can permeate the solvent, so that the solvent spills out from the solvent supply side to the outside of the solvent application heavy nozzle 11. ventilate, especially when using toxic solvents.

There are health and safety issues such as fire hazards, and unnecessary solvents are consumed.

In addition, if solvent application is performed while the wiping material 2 is held between the heavy nozzle 11 and the presser plate 13, the wiping material 2
As long as the solvent is able to permeate through the solvent, the solvent will not be spilled, but as shown in Figure 12, which shows how the solvent is applied to the wiping material 2, the supply side (on the left side in Figure 12) is larger than the non-supply side (on the left side in Figure 12). From the right side of Fig. 12), the amount of solvent applied (the shaded area 2a shown in Fig. 12)
(indicates that the solvent has penetrated into the wiping material), so unnecessary solvent may be applied during cleaning.
It is economically bad because it is not possible to minimize the amount of solvent consumed.

Therefore, at present, if the solvent is applied after the solvent has permeated the entirety of the felt 14, which has liquid-absorbing properties, while the wiping material 2 is held between the heavy nozzle 11 and the holding plate 13, the wiping material 2 can be embedded in the slits. The liquid can be applied uniformly over the width of the absorbent felt 14, but in order to do so, there are economic aspects such as the time required for the solvent to permeate the entire absorbent felt 14 and the amount of solvent consumed, as well as safety and health aspects. If this is ignored, the solvent required for cleaning cannot be uniformly applied to the wiping material 2.

Therefore, the present invention addresses the above-mentioned problems, minimizes the consumption of solvent necessary for cleaning, and wipes the liquid with the width of the absorbent felt 14 embedded in the slit in a short time, in a safe and hygienic manner. To provide a screen printing machine with a cleaning mechanism capable of uniformly coating a material 2.

Means for Solving the Problems In order to solve the above-mentioned problems, the screen printing machine with a cleaning mechanism of the present invention has a solvent application nozzle installed in an inner pipe having a plurality of small holes at the bottom and an inner pipe having a plurality of small holes at the top. It has a double nozzle structure with an outer pipe in which a liquid-absorbing substance is embedded in the slit.

Effect of the present invention With the above-described structure, the solvent is ejected from the small hole provided at the bottom of the inner pipe, and is stored in the outer pipe. Since the solvent penetrates almost evenly from the bottom to the top over the entire length of the object, the width of the absorbent object embedded in the slit allows the solvent necessary for cleaning to be distributed evenly in a straight line onto the wiping material in a short time. It can be applied over a wide range of applications without consuming unnecessary solvents, which solves economic and health and safety issues.

EXAMPLE Hereinafter, a screen printing machine with a cleaning mechanism according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a solvent application section of a screen printing machine with a cleaning mechanism according to an embodiment of the present invention, and FIG.
Detailed partial cross-sectional view of the solvent coating double nozzle in Figure 3.
This figure is a partial view of the inner pipe 26 in FIG. 2 as viewed from arrow G.

In FIG. 1, the vertical reciprocating motion (
A nozzle holder 18a is attached to a cylinder 17a117b that moves in the direction of arrows Yc and Yd shown in FIG.

18b is fixed, and its nozzle holder 18a.

A solvent coating double nozzle 19 is installed at 18b. After raising the cylinders 17a and 17b and sandwiching the wiping material 21 between the solvent coating double nozzle 19 and the holding plate 2o, the second
As shown, the solvent is supplied from tube 22 to outer pipe 23. The solvent passes through the supply port 24 of the outer pipe 23 and is supplied to the inner pipe 26. A plurality of small holes 27 are provided at the bottom of the inner pipe 26, as shown in FIG.

The solvent is poured into a plurality of small holes 27 provided at the bottom of the inner pipe 26.
The solvent 28 flows through the outer pipe 23 as shown in the H-H sectional view of the solvent application double nozzle 19 in FIG. 2 of FIG.
stored inside. A liquid-absorbing felt 29 is embedded in a slit provided in the upper part of the outer pipe 23, and when the solvent 28 is stored in the outer pipe 23 until it comes into contact with the lower part of the liquid-absorbing felt 29, Solvent 2
8 penetrates from the bottom to the top over the entire length L (shown in FIG. 2) of the felt 29 having liquid absorbing properties.

The situation is shown in Fig. 5, where the solvent 28 penetrates into the absorbent felt 29 as shown by the arrow 1. The solvent 28 penetrates into the liquid-absorbing felt 29 in this order. When the solvent 28 penetrates into the entirety of the liquid-absorbing felt 29, the liquid-absorbing felt embedded in the slit of the outer pipe 23 is removed, as shown in the shaded area 21a in the diagram of the solvent application state of the wiping material 21 shown in FIG. With a width of 29 mm, coating can be applied almost linearly and uniformly.

As described above, according to this embodiment, the solvent coating double nozzle 1
9 is an inner pipe 26 with a plurality of small holes 27 at the bottom.
and felt 29 with absorbent properties in the slit at the top.
By constructing the outer pipe 23 with an embedded outer pipe 23, after the solvent is ejected from the plurality of small holes 27 of the inner pipe 26, it is stored in the outer pipe 23, and then the solvent is ejected from the lower part along the entire length of the liquid-absorbing felt 29. Since the solvent penetrates almost evenly from the top to the top, the width of the absorbent felt 29 embedded in the slit allows the solvent necessary for cleaning to be uniformly applied linearly to the wiping material in a short time. Because it does not consume unnecessary solvents, it is economical and good in terms of safety and hygiene.

Effects of the Invention As described above, the present invention provides a solvent application nozzle with an outer pipe in which a liquid-absorbing object is embedded in the slit, and an inner pipe in which a plurality of small holes are provided in places that do not come into contact with liquid-absorbing objects. By constructing the pipe, the amount of solvent consumed can be kept to a minimum, and the width of the liquid-absorbing object embedded in the slit can be applied uniformly to the wiping material in a short period of time, increasing efficiency. physical, economical, safety and health.

[Brief explanation of the drawing]

FIG. 1 is a front view of a solvent application section of a screen printing machine with a cleaning mechanism according to an embodiment of the present invention, FIG. 2 is a partially sectional front view of a solvent application double nozzle, and FIG. A plan view of the inner pipe viewed from the direction of arrow G, Figure 4 is a cross-sectional view of the solvent application double nozzle taken along line H-H in Figure 2, and Figure 5 shows how the solvent penetrates into the felt. 6 is an explanatory diagram showing the state of solvent application of the wiping material, FIG. 7 is a schematic side view of the cleaning mechanism section of a conventional screen printing machine with a cleaning mechanism, and FIG. 8 is an arrow B of the solvent application section. 9 is a partially cross-sectional front view of the solvent coating heavy nozzle, and 10 is a front view of the 9th direction.
Solvent application taken along line C-C in the figure - cross-sectional view of the heavy nozzle, Figure 11 is an explanatory diagram showing how the solvent penetrates into felt, and Figure 12 is an explanatory diagram showing how the solvent is applied to the wiping material. It is a diagram. 19... Solvent coating double nozzle, 2o...
・Press plate, 21... Wiping material, 22...
...Outer pipe, 26...Inner pipe, 27.
...Multiple small holes, 28...Solvent, 29
...Felt with liquid absorption properties.

Claims (1)

[Claims] A solvent application nozzle and a holding plate are provided with the wiping material in the middle, and the solvent is applied to the wiping material while the wiping material is held between the solvent application nozzle and the holding plate, and the screen plate is coated with the applied wiping material. In a screen printing machine equipped with a cleaning mechanism that automatically wipes the lower side, the solvent application nozzle is installed in a plurality of places where the solvent application nozzle is not in contact with the outer pipe in which a liquid-absorbing object is embedded in the slit and the liquid-absorbing object. A screen printing machine with a cleaning mechanism characterized by comprising an inner pipe with small holes.