JP3504398B2 - Scraper - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printer SCRAPER. Also called scraper, in this specification,
Hereinafter referred to as a scraper. In particular, it relates to a two-piece scraper in which the scraper is composed of a blade and a base.

[0002]

2. Description of the Related Art FIG. 8 is a perspective view showing a screen printing machine. FIG. 9 is a schematic side view of the screen printing machine. FIG. 10 is a schematic plan view of the screen printing machine.

In FIG. 8, 101 is a screen printing machine, 102 is a base of the screen printing machine, 103 is a movably attached table, 104 is a guide rail for guiding the movement of the table, and 105 is an operation of the screen printing machine. A box, 107 is an operation switch attached to the operation box, and 109 is a printing unit for performing screen printing on a work placed on the table 103. 9 and 10, 110 is a work placed on the table 103, 200 is a screen plate, 1 is a screen frame of the screen plate 200, 201 is a screen stretched on the screen plate 200, 106 is a squeegee 111 and the drawing. A slider that holds a scraper (not shown) and slides in the directions of arrows A and D, and 108 is a slide base that slides the slider 106.

The table 103 is attached so as to be slidable right and left along a guide rail 104 attached to the base 102. Table 103 is printing unit 1
When the table 103 is moved below 09, the table 103 is stopped by a stopper (not shown), and the printing unit 109 performs screen printing on the work 110.

FIG. 11 is a diagram showing an example of the screen printing plate 200. The screen engraving 200 shown in FIG.
The case of a combination screen is shown. In the figure, 1 is a screen frame, 2 is a support screen, 3 is a print screen, and 4 is a joint between the support screen 2 and the print screen 3. Further, 201 is a screen including a support screen 2, a print screen 3, and a joint portion 4.

FIG. 12 is a view showing the surface of the print screen 3. FIG. 13 is a diagram showing the back surface of the print screen 3. 12 and 13, 30 is a screen mesh, and 31 is an emulsion provided on the back side of the screen mesh 30. The emulsion 31 has an opening 32. The opening 32 is provided for forming a print image. Ink (paste) passes through this opening and adheres to the work 110, so that screen printing is performed on the work.

14 and 15 are sectional views taken along line XX of the screen printing machine shown in FIG. The squeegee holder 1 is operated by a mechanism not shown in FIGS. 14 and 15.
20 and the scraper holder 320 are attached to the slider 106 so as to be vertically movable. Figure 1
In the case of No. 4, the slider 106 is moving in the direction of arrow A, the squeegee 111 is pushed down in the direction of arrow B, and printing is performed on the work 110 using the ink 150. There is. Scraper holder 3
20 holds the scraper 311 and is pulled up in the direction of arrow C during the printing operation by the squeegee. When printing is performed using the squeegee 111, printing is performed with high printing pressure. As shown in FIG. 14, the point P where the squeegee contacts the screen presses the screen by the pressure applied to the squeegee. This point P moves on the screen surface as the squeegee moves.

FIG. 15 shows a case where the slider 106 moves in the direction of arrow D. When the slider moves in the direction of arrow D, the squeegee holder 120 is pulled up in the direction of arrow E. On the other hand, scraper holder 320
Is pushed down in the direction of arrow F, and scraper 3
11 moves on the screen surface while being in contact with the screen 201. The scraper 311 has a role of pushing back the ink 150 moved to the right side of the drawing by the squeegee 111 to the left side of the drawing. Further, it has a role of uniformly coating the ink on the screen surface after printing with the squeegee 111. The screen printer performs screen printing while moving the screen holder in the direction of arrow A as shown in FIG. Further, as shown in FIG. 15, when the slider is moved in the direction of arrow D, the ink is returned and the ink on the screen surface is recoated uniformly.

FIG. 16 shows the squeegee 111 shown in FIG.
FIG. 6 is a diagram showing a screen cross section when printing is performed on the work 110. The ink 150 adheres to the work 110 through the emulsion openings 32 provided on the back side of the screen mesh. Further, since the squeegee 111 is made of a member having a certain elasticity such as urethane rubber, the ink 150 is unevenly coated on the surface of the screen after the squeegee 111 has passed.

FIG. 17 shows a case where the scraper 311 is returning ink. The scraper 311 is made of metal such as stainless steel. Further, the tip portion thereof has a taper portion 312, which is in contact with the screen surface at a point Q. Since the scraper 311 is made of a metal such as stainless steel, the ink 150 is uniformly coated on the surface of the screen after the scraper 311 has passed. In this way, by creating a uniformly coated state, the next printing with the squeegee 111 becomes even.

FIG. 18 is a diagram showing an example of the scraper 311. FIG. 19 shows the scraper 31 shown in FIG.
It is a figure which shows the relationship with the screen 201 when 1 is used. The scraper shown in FIG. 18 has a straight end 315 of the scraper. Therefore, as shown in FIG. 19, when pressed against the screen in the direction of arrow F, high pressure is applied to both end portions P1 and P3, and low pressure is applied to the central portion P2. in this way,
Since the pressure changes in each part of the screen 201, the ink 150 cannot be uniformly coated on the screen surface. Therefore, as shown in FIG. 20, there is a case where a scraper 311 having an end 316 having a curvature is used. As shown in FIG. 21, the end of the scraper 311 has both ends P1 and P.
Since it projects more in the central portion P2 than in No. 3, almost the same pressure is applied to the screen 201 at any point, and it becomes possible to uniformly coat the surface of the screen with the ink 150.

[0012]

As shown in FIGS. 14 and 15, the distance L between the squeegee 111 and the scraper 311 may be the distance between which the ink 150 is sandwiched, and if it is made longer than necessary, screen printing is performed. This causes the inconvenience that the size of the machine itself becomes large. Further, the squeegee 111 is held by the squeegee holder 120,
The scraper 311 is held by the scraper holder 320. Further, the squeegee holder 120 and the scraper holder 320 are attached so as to be vertically movable by a mechanism not shown in FIGS. 14 and 15.
Since there is a squeegee holder, a scraper holder, and a mechanism for attaching them so that they can move vertically,
11 and the scraper 311 are difficult to put in a short distance. Therefore, the scraper 311 has two bent portions 313 and 314 as shown in FIGS. 18 and 20. The scraper 311 is bent into a crank shape by the two bent portions 313 and 314. This scraper 31 bent into a crank shape
14 is attached to the scraper holder 320 as shown in FIGS. 14 and 15, the squeegee 111 and the scraper 311 can be arranged at a distance required to convey the ink 150 and at a distance L as small as possible. become. The scraper 311 has a tapered portion 312.
have. Furthermore, as shown in FIG. 20, the scraper 311 may have a curvature at the end 316 in contact with the screen surface. In particular, in a large screen printing machine, by using a scraper having this curvature, uniform pressure can be applied to the entire screen, which is indispensable for obtaining a uniform ink coating. .

As described above, the conventional scraper has a crank-like shape having two bent portions, and a taper portion must be formed in a portion in contact with the screen surface. In addition, the part in contact with the surface of the screen had to have a curvature. For example, this curvature has a scraper width of 1 as shown in FIG.
In the case of m, it has a convex portion of about 1 mm to 2 mm, and its processing requires a highly precise processing technique.

As described above, the conventional scraper has to have the bent portion and the tapered portion. As described above, since the tapered portion is formed on the part bent in the crank shape, it takes a lot of time and labor.
Further, in order to give the scraper a curvature, it is conceivable to process it by using a numerical control (NC) machine, but a numerical control machine was used for a part bent in a crank shape. It was very difficult to process. For the scraper 311 bent like a crank,
In order to have a curvature, when the numerical control machine could not be used, it was necessary to manually scrape off the end of the scraper and polish it.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a scraper that can be easily and inexpensively manufactured for a screen printer. To do.

Another object of the present invention is to provide a scraper capable of easily exchanging various kinds of scrapers for a screen printing machine.

Another object of the present invention is to provide a scraper which can be machined by a numerical control machine or the like when the tapered portion of the scraper has a curvature.

Another object of the present invention is to obtain an effective scraper for a large screen printing machine.

[0019]

The scraper of the present invention is a scraper for a screen printing machine, comprising a base attached to the screen printing machine and a blade for rubbing the screen surface, and the base and the blade are separately provided. It is characterized by being manufactured and joined.

The base and the blade are manufactured by using different materials.

The material of the blade is iron, stainless steel, aluminum, aluminum alloy, plastic, polyethylene, polypropylene or urethane rubber.

The base is a bent plate having a bent portion.

The above-mentioned blade is a flat plate having a taper portion at the end contacting the screen surface.

The end portion of the flat plate has a convex shape toward the center of the screen.

The above-mentioned base is characterized in that it is used as a scraper by itself.

[0026]

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1. FIG. 1 is a side view of a screen printing machine equipped with the scraper of the present invention. In the figure, 350 is the base of the scraper, 351 is the blade of the scraper, and 360 is the base 350 and the blade 35.
It is a mounting screw that joins 1. Further, in FIG. 1, the same or corresponding parts as those described in the conventional example are designated by the same reference numerals.

FIG. 2 is a view showing the base 350 and the blade 351 of the scraper of the present invention. Blade 35
Reference numeral 1 is a flat plate having a tapered portion 352. Further, the end portion thereof has a predetermined curvature. As described above, by manufacturing the blade 351 with a flat plate, the blade 351
Can be easily created by a machine tool such as a numerical control machine. In addition, since it can be created by the numerical control machine even when it has a curvature, it is possible to create a complicated curve. For example, the end portion 353 can be formed as an arc of a circle, an elliptic arc or a parabolic line may be used, or a quadratic curve may be used. Also, a combination of these may be used. On the other hand, the base 350 has two bent portions 361 and 362 as in the conventional case, and has a crank-like shape as a whole.
When the base 350 is manufactured, a flat plate may be used and the base 350 may be formed by bending the bent portions 361 and 362. The attachment of the base 350 and the blade 351 is performed using the attachment screw 360. The base 350 and the blade 351 can be detachably attached using the attachment screw 360. If the blade 351 does not need to be detachably attached, the blade 35
1 may be fixed to the base with an adhesive. Alternatively, welding may be stopped.

FIG. 3 shows a case where the base 350 itself has a function as a scraper. Base 3
A taper portion 363 is formed at 50. Therefore, the base 350 is the same as a conventional scraper. However, a screw hole 371 for attaching the blade 351
And 372 are different. By having these screw holes 371 and 372, the blade 35
It is possible to attach 1. When the blade 351 is attached, the height H2 of the blade 351 needs to be larger than the height H1 of the end portion of the edge portion of the base 350.

The scraper shown in FIG.
1 has fins 354 and 355 on both sides. The fins 354 and 355 are for preventing the ink 150 from leaking from both sides of the blade 351. In the figure, the fins 354 and 355 are shown to have no tapered portion, but the fins 354 and 355 may have tapered portions. Moreover, you may make it give a curvature.

FIG. 5 is a flow chart showing the method for manufacturing the above-mentioned scraper. First, in S1, a scraper base 350 is created. First, a flat plate is prepared, and screw holes are created at predetermined positions on the flat plate. Next, bent portions 361 and 362 are provided, and the base has a crank shape. Next, in S2, the scraper blade 351
To create. First, prepare a flat plate to be used for the blade, create a taper part using a program previously installed in the numerical control machine,
The edge is processed so that it exhibits a curvature. Also, a screw hole is provided. This screw hole may be provided in advance on the flat plate. In S3, the base and the blade are connected using the mounting screw 360. In addition, S1 and S2 described above
The steps of can be reversed.

FIG. 6 shows a case where the scraper is prepared by changing the material of the blade. 381 is a stainless steel blade. 382 is a plastic blade. 383 is a polyethylene blade. 384
Is a polypropylene blade. Although not shown, a blade made of hard urethane rubber may be formed. The base 350 is made of stainless steel. In addition to stainless steel, the base 350 is made of iron, aluminum, aluminum alloy, plastic, polyethylene,
Polypropylene or urethane rubber may be used. As described above, in the present invention, the scraper is manufactured separately for the base and the blade, so that the materials of the base and the blade can be changed. The blade only needs to have a function of returning the ink and a function of uniformly coating the ink. Further, it may be desirable to change the material of the blade depending on the viscosity of the ink and the tension of the screen. Even in such a case, instead of replacing the entire scraper, only the blade portion of the scraper needs to be replaced. Therefore, it is possible to replace the blade by preparing only one base 350 and preparing a plurality of types of blades made of different materials. Although not shown, a plurality of blades made of the same material may be prepared. Also, although not shown,
A plurality of blades having different sizes and shapes may be prepared.

FIG. 7 is a flow chart showing the procedure of replacing the scraper. In S11, the scraper is removed from the screen printing machine. In S12, the base of the scraper and the blade are separated. This separation work is performed by removing the mounting screw. A new blade is joined to the base of the scraper in S13.
This connection is made by means of mounting screws. In step S14, the scraper is attached to the screen printing machine. In the conventional replacement of the scraper, since the scraper was composed of one part, the entire scraper had to be replaced. On the other hand, in the present invention, only the blade of the scraper is required to be replaced. Therefore, by preparing a plurality of blades, various blades can be replaced. Although the shapes of the blades shown in FIG. 6 are all the same, the blades of different shapes or different sizes may be replaced. Further, the blade may be replaced with a blade having a different shape or different size and different material. For example, those with no curvature, those with curvature, those with different degrees of curvature, those with different blade widths, those with different blade thickness, those without blade fins, and those with fins on blades. It is possible to exchange blades with different shapes and sizes, which are combined with each other.

Incidentally, in FIG. 7, in S11,
Although there is a step of removing the scraper once and finally mounting the scraper in S14, if the mounting screw 360 can be directly attached and detached from the outside of the screen printing apparatus, the steps shown in S11 and S14 are omitted. It is possible. That is, if you want to replace the scraper, as shown in S12 and S13,
The scraper can be replaced by directly removing the blade and directly connecting the new blade.

In the above embodiment, the base 350
1 has two bent portions, it may have one bent portion. Alternatively, a flat plate having no bent portion may be used. The present invention is characterized in that the scraper, which is conventionally manufactured as one component, is divided into at least two components. Thus, the two-piece scraper has a great feature that the material of one component can be changed from the material of the other component. Also, the performance may differ due to the replacement of one part, or
The feature is that scrapers having different shapes can be realized. In addition, by dividing the scraper into a base and a blade, it is possible to easily store and manage a large number and various kinds of scrapers. In particular, in a large-sized screen printing machine, the width of the scraper becomes 1 m or more, and when using the conventional one-component scraper, for example, 10 kinds of crank-shaped scrapers must be stored and managed. In, the flat plate 1
It is sufficient to store and manage 0 types of blades. Since the blade is made of a flat plate as described above, the storage area occupies a smaller area than in the conventional case. Further, since the material can be changed, the lightweight scraper makes it convenient to handle even a large scraper because the weight is reduced. Further, as described above, since the blade can be produced by a machine tool such as a numerical control machine, there is an effect that manufacturing variation of the manufactured blade is eliminated. Conventionally, the blades are machined by hand, but since they can be machined, blades having the same shape can be obtained with less variation compared to manual blades. In particular, a blade used in a large screen printing machine needs to have a curvature, so that the blade can be machined is a great advantage. Further, the machining cost leads to a reduction in the machining cost, and the scraper manufacturing cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a partial side view of a screen printing machine using a scraper of the present invention.

FIG. 2 is a diagram showing a scraper of the present invention.

FIG. 3 is a diagram showing another scraper of the present invention.

FIG. 4 is a diagram showing another scraper of the present invention.

FIG. 5 is a flowchart showing a procedure for manufacturing the scrapper of the present invention.

FIG. 6 is a diagram showing replacement of blades of the scraper of the present invention.

FIG. 7 is a flow chart showing the procedure of replacing the scraper of the present invention.

FIG. 8 is a perspective view of a conventional screen printing machine.

FIG. 9 is a schematic front view of a conventional screen printing machine.

FIG. 10 is a schematic plan view of a conventional screen printing machine.

FIG. 11 is a perspective view of a conventional screen printing plate.

FIG. 12 is an enlarged view of a conventional screen surface.

FIG. 13 is an enlarged view of the back surface of a conventional screen.

FIG. 14 is a diagram showing a conventional screen printing operation.

FIG. 15 is a diagram showing an operation of a conventional scraper.

FIG. 16 is a diagram illustrating a conventional screen printing operation.

FIG. 17 is a diagram illustrating the operation of a conventional scraper.

FIG. 18 is a view showing a conventional scraper.

FIG. 19 is a diagram showing a relationship between a conventional scraper and a screen.

FIG. 20 is a diagram showing a conventional scraper.

FIG. 21 is a diagram showing a relationship between a conventional scraper and a screen.

[Explanation of symbols]

101 screen printer, 102 base, 103 table, 104 guide rail, 105 operation box, 106 slider, 107 operation switch, 109
Printing department, 110 works, 200 screen plate making,
201 screen, 108 slide base, 111 squeegee, 2 support screen, 3 print screen, 4 joints, 30 screen mesh, 31 emulsion, 32 openings, 311 scraper, 350 base, 351 blade, 360 mounting screws, 36
1,362 Bent portion, 371, 372, 373, 374
Screw hole, 352 taper part, 353 end part, 35
4,355 fins.

Continuation of front page (56) Reference JP-A-50-61659 (JP, A) JP-A-5-77393 (JP, A) JP-A-5-57870 (JP, A) JP-A-6-316055 (JP , A) JP-A-4-341846 (JP, A) Actually opened 62-94036 (JP, U) Actually opened 53-91709 (JP, U) Actually opened 59-50737 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41F 15/40-15/44 H05K 3/12 610 H05K 3/34 505

Claims (6)

(57) [Claims] 1. A scraper for a screen printing machine, comprising a base that can be used as a scraper by itself, and a blade that scrapes the screen surface instead of the base, and the base and the blade are individually manufactured and joined. A scraper that is characterized by 2. The scraper according to claim 1, wherein the base and the blade are manufactured by using different materials. 3. The scraper according to claim 2, wherein the material of the blade is any one of iron, stainless steel, aluminum, aluminum alloy, plastic, polyethylene, polypropylene, and urethane rubber. 4. The scraper according to claim 1, wherein the base is a bent plate having a bent portion. 5. The scraper according to claim 4, wherein the blade is a flat plate having a tapered portion at an end portion in contact with the screen surface. 6. The end portion of the flat plate has a convex shape toward the center of the screen.
The described scrapper.