JPH09192579A - Fixing jig for printing of cover member of push button switch and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing fixing jig of a cover member for a push button switch eliminating printing shift or printing irregularity at a time of the screen printing of a character or a mark to the cover member for the push button switch and enabling printing of high positional accuracy and stable quality in low cost and a method for producing the printing fixing jig. SOLUTION: The printing fixing jig 1 of a cover member for a push button switch is constituted by fixing the cover member for the push button switch to the printing fixing jig 1 and applies the display printing of a character or a mark to the top surface or rear surface of the key top part of the cover member of the push button switch and is composed of a silicone resin or a metal resin, The uneven shape of the surface opposed to the printing surface of the cover member for the push button switch is provided to the surface fixing the cover member for the push button switch of the printing fixing jig 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a top surface of a key top portion of a push button switch cover member including a key top portion, a dome portion and a base portion, or a key top portion and a base portion, or a back surface of a push button switch cover member. The present invention relates to a fixing jig for printing a cover member for a push button switch used for printing characters, symbols and the like, particularly for screen printing, and a manufacturing method thereof.

[0002]

2. Description of the Related Art When printing characters or symbols for display on the top surface of a key top portion of a cover member for a push button switch (hereinafter simply referred to as a cover member) or the back surface of the cover member, a positioning or
A fixing jig for printing molds for fixing was manufactured and used. In the production of this fixing jig for die printing, cutting work (milling, electric discharge machining) and precision finishing work were performed using a die material in order to obtain accurate position accuracy and shape. As described above, the fixing jig for mold printing is no different from the manufacturing of precision molds even though it is a jig, and it takes time to process and the manufacturing cost is high.

[0003]

Further, also during printing, it is necessary to make slight corrections to the printing fixing jig in accordance with the molded cover member, which impedes quick delivery and low cost. Furthermore, when the key tops of the cover member are not the same height, a fixing jig for printing is required for each key top having the same height, which increases the manufacturing cost of the fixing jig for printing and increases the number of printing processes. Therefore, the manufacturing cost of the cover member is increased. In addition, when the key top portion of the cover member has a three-dimensional shape, print misalignment, print unevenness, and the like occur during screen printing, which is not preferable in terms of quality.

The present invention is intended to solve such a conventional problem, and is for printing on a cover member which enables low-cost, high positional accuracy and stable quality printing regardless of the shape of a molded product. A fixture and a manufacturing method thereof are provided.

[0005]

According to the printing fixing jig of the present invention, a cover member is fixed to the printing fixing jig, and characters, symbols, etc. are provided on the top surface or the back surface of the key top portion of the push button switch cover member. Is a fixing jig for printing for performing display printing of, and is made of a silicone resin or a metal resin. The fixing surface of the cover member for the push button switch of the fixing jig for printing is printed with the cover member for the push button switch. It is characterized in that a concavo-convex shape of a surface facing the surface is provided. The method of manufacturing a fixing jig for printing is to apply a polyurethane resin or silicone resin to the front surface or front and back surfaces of the cover member to form a film, and then fix the cover member after the film formation to the jig molding die by adhesion. It is characterized in that the cover member is molded by casting a mold-forming silicone resin or metal resin, and after curing, the cover member after the film formation is released.
Prior to the formation of the film, the surface or front and back surfaces of the cover member may be irradiated with plasma for surface modification, a primer may be applied, and then a film of polyurethane resin or silicone resin may be formed.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The cover member fixing surface of a fixing jig for printing of a cover member of the present invention used for display printing of characters and symbols on the top surface of a key top portion of a cover member or the back surface of the cover member, There is provided an uneven plate mold on the surface of the cover member facing the printing surface, and the printing is performed by fitting the cover member on the plate surface. The present invention will be described in more detail. FIG. 1 shows a fixing jig 1 for printing a cover member of the present invention. FIG. 1A shows a fixing jig for printing for the top surface of a key top portion. Has a plurality of convex portions 2 formed by molding the dome portion and the base portion on the back surface of the key top portion of the cover member. (B) is a fixing jig for printing on the back surface of the cover member, and a plurality of concave portions 3 are formed on the cover member fixing surface of the fixing jig 1 for printing, in which the key top portions of the cover member are molded. There is.

FIG. 2 shows a printing fixing jig 1 for printing.
The cover member 4 is assembled in the state shown in (a), and the cover member 4 is attached to the fixing jig 1 for printing for the top surface of the key top portion.
Is assembled from the direction of the arrow, the dome portion on the back surface of the key top portion 5 of the cover member 4 is fitted into the convex portion 2 and incorporated into the printing fixing jig 1, and the key top portion 5 of the cover member 4 is assembled.
Predetermined printing of characters, symbols, etc. is performed on the top surface 6 of the. (B) is a printing fixing jig 1 for the back surface of the cover member.
Shows how the cover member 4 is assembled from the direction of the arrow,
The key top portion 5 of the cover member 4 is fitted in the concave portion 3 and incorporated in the fixing jig 1 for printing, and predetermined printing is performed on the back surface 7 of the cover member 4. FIG. 3 shows a cover member 4 printed by using the printing fixing jig of the present invention. FIG. 3A shows the cover member 4 having a number printed on the top surface 6 of the key top portion 5. 9B shows the cover member 4 with numbers printed on the back surface side of the cover member 4, that is, the position on the back surface side corresponding to the top surface 6 of the key top portion 5. In this manner, characters, symbols, etc. are printed and displayed on the top surface of the key top portion of the cover member or the back surface of the cover member.

When the printing fixing jig of the present invention having such a structure is used for screen printing on the top surface of the key top portion of the cover member or the back surface of the cover member, the cover member is smooth on the printing fixing jig. It can be held, fixed and positioned accurately, and stable and precise printing can be performed.

Next, a method of manufacturing the printing fixing jig of the present invention will be described in detail. 1) Formation of a film on the surface of the cover member; a film is formed on the surface of the cover member in order to copy the uneven shape of the surface facing the printing surface of the cover member on the cover member fixing surface of the printing fixing jig in the same size. Although formed, the surface of the cover member is modified prior to forming the film. The surface modification of the cover member is performed by irradiating plasma. The plasma irradiation is preferably a low-temperature plasma treatment, and a mixed gas of O ₂ and Ar is used as a plasma gas for ₂ to 10 minutes, preferably 4 to 5 minutes for surface modification. After that, a primer such as a silane coupling agent is applied, and then a polyurethane resin or silicone-based ink is evenly applied using a sprayer or a coating machine, and the surface of the cover member is made of polyurethane with a thickness of 50 to 100 μm. Form a film of resin or silicone-based ink. The film thus formed firmly adheres to the surface of the cover member.

Incidentally, this film formation is carried out when a fixing jig for printing for the top surface of the key top portion of the cover member is manufactured.
A film is provided on both the front and back sides of the cover member. On the other hand, when manufacturing a printing fixing jig for printing the back surface of the cover member,
The coating is provided only on the surface side of the cover member, that is, the key top surface side. By forming a film on the front surface and / or the back surface of the cover member in this way, a cover member for mold making is formed, and the mold release becomes smooth at the time of mold making of the printing fixing jig, and at the time of printing, The cover member can be easily incorporated into the printing fixing jig, and can be easily detached after printing, that is, detached. However, if the film is formed too thickly, the clearance between the fixing jig for printing and the cover member becomes too large at the time of printing to cause backlash, an accurate position cannot be obtained, and printing deviation occurs. On the other hand, if the film is too thin, the clearance will be too small to be assembled, and it will be difficult to remove it, resulting in poor workability.

2) Molding of Printing Fixing Jig: First, the molding of the printing fixing jig for printing the top surface of the key top portion will be described with reference to FIGS. FIG. 4 is a partially enlarged cross-sectional view of the cover member having the coating formed on both the front and back surfaces by the above treatment. A plasma treatment layer 9, a primer layer 10, and a coating layer 11 of a polyurethane resin or a silicone-based ink are sequentially formed on both front and back surfaces of the cover member 8.
In addition, 12 is a dome part. 5 (a), (b),
(C) shows a mold making process of the fixing jig for printing.

First, as shown in FIG. 5A, a double-sided adhesive tape 14 is attached (or an adhesive is applied) on the jig forming base 13, and the key top portion of the cover member 8 is placed thereon. The top surface 6 is adhered and fixed. At this time, the top surface 6 of the key top portion is surely and uniformly adhered and fixed to the jig forming base 13, so that the cover member 8 can be pressed evenly so that the cover member 8 has a sponge 15 such as polyurethane foam.
Is placed, and the entire cover member 8 is pressed from above so as not to move uniformly.

Next, the key top portion is the jig forming base 13
After being bonded and fixed to the mold, the mold frame 16 is set on the jig forming base 13 as shown in FIG.
7. For example, silicone RTV is gently poured into the mold 16 in a sufficient amount (about 20% of the volume of the molding mold 18 formed by the jig molding base 13 and the mold 16). Then, in FIG. 7C, the pressing lid 20 is covered and the molding resin 17 is cured. The molding resin 17 that has been cast in a sufficient amount by pressing with the presser lid 20 reaches the details of the cover member 8 and the excess resin is discharged from the flow groove (not shown) of the mold frame 16. . After the molding resin 17 is sufficiently hardened, the presser lid 20, the mold frame 16, and the jig forming base 13 are removed, unnecessary unnecessary thickness portions are cut off, and the cover member 8 is taken out. At this time, the cover member 8 can be easily peeled and taken out from the molding resin 17 by the film of the polyurethane resin provided on the surface. Then, the fixing jig for printing for the top surface of the key top portion, in which the concave and convex shape of the back surface of the cover member, that is, the dome portion 12 side of the rear surface of the key top portion is completely duplicated on the cast resin surface Is obtained.

In order to print on the top surface of the key top portion of the cover member using the print fixing jig for the top surface of the key top portion obtained in this way, the printing fixing jig is used as a jig fixing plate. When the height of the key top portion of the cover member to be printed is low (about 5 mm or less), printing may be performed with a general screen printer as it is. If the height of the key top is high (about 5 mm or more), it can be printed with a printing machine in the same way by covering it with a top lid that fits the fixing jig for printing so that the key top does not shift during printing. You can

Next, the molding of the printing fixing jig for printing the back surface of the cover member will be described with reference to FIGS. FIG. 6 is a partially enlarged cross-sectional view of the cover member in which a film is formed on the surface side of the cover member by the previous treatment, and the film layer 11 is provided so as to cover the surface of the key top portion 5. Figure 7
(A), (b), (c) is a figure which shows the mold making process of the fixing jig for printing.

First, as shown in FIG. 7A, a double-sided adhesive tape 14 is attached (or an adhesive is applied) on the jig forming base 13, and the cover member 8 is flattened thereon. The back surface 7 is adhered and fixed. At this time, the jig forming base 13
The cover member 8 is firmly and uniformly adhered and fixed on the cover member 8
The sponge 15 is placed on the cover member 8 so that the whole member can be pressed uniformly, and the entire cover member 8 is pressed from above so that it does not move uniformly. After that, as in the case of the printing of the fixing jig for printing for the top printing on the key top part,
The mold 16 is set on the jig forming base 13, the mold resin 17 is gently poured into the mold 16 in a sufficient amount (see FIG. 7 (b)), and the cover 20 is pressed and pressed. After that, molding resin 17
Is cured (see FIG. 7C). After the shaping resin 17 is sufficiently cured, the pressing lid 20, the mold 16, the jig forming base 13
Are removed, unnecessary unnecessary portions are cut off, and the cover member 8 is taken out. Then, a printing fixing jig for printing on the back surface of the cover member is obtained in which the uneven surface of the cover member, that is, the key top portion 5 side is completely duplicated on the cast resin surface.

To print on the top surface of the key top portion of the cover member using the printing fixing jig for the top surface of the cover member, the dome portion on the back surface of the key top portion of the printing fixing jig has the same size. The dome portion of the cover member of the printing target is fitted to the convex portion duplicated in step 3, and the top surface of the key top portion is printed using a screen printer or the like. Further, in order to print on the back surface of the cover member using the printing fixing jig for printing the back surface of the cover member, in the recessed portion in which the key top portion of this printing fixing jig is duplicated, The key top portion of the cover member is fitted and printing is performed on the back surface of the cover member using a screen printing machine or the like. Thus, it is possible to print with high accuracy without misalignment.

When a silicone resin is used as the molding material for the fixing jig for printing, a polyurethane resin is used for forming a film on the surface of the molding cover member, and the shrinkage ratio is 0.05 to
1.0%, preferably 0.08-0.8%, rubber hardness 30-90
A mold-making silicone RTV having a temperature of ° H, preferably 50 to 80 ° H is used. When using a metal resin, use a silicone-based ink to form a film on the surface of the cover member, and use a metal resin for molding that has a shrinkage ratio as low as that of silicone RTV and a Rockwell hardness of about 90 to 100. The method of molding the fixing jig for printing is the same as that of silicone RTV for molding.

As the metal resin, polycarbonate,
Acrylic, vinyl chloride, etc. mixed with metal powder (iron powder, Al powder, etc.) can be used, but considering shrinkage, machinability, chemical resistance, etc. It should be mixed with powder. The viscosity of the molding RTV or the metal-based resin is preferably 300 to 2000 poise in order to surely spread the resin to the details of the molding die in a short time. Especially 500-2000
Poise, good workability and clean finish. Three
If it is less than 00 poise, it will easily flow into the gap between the jig forming base and the mold, and between the mold and the pressing lid, and it will be easy to create extra thin burrs.
Stable printing is difficult. In addition, when it exceeds 2000 poise, the resin material does not flow easily, and it is impossible to spread the injected resin to the details of the molding die.
Easy to create a nest.

[0020]

【Example】

[Embodiment 1] In this embodiment, production of a printing fixing jig for the top surface of the key top portion will be described. KBM-403 (manufactured by Shin-Etsu Chemical Co., Ltd.) 50 after performing low-temperature plasma treatment for 4 minutes using O ₂ and Ar mixed gas on both sides of the cover member having a dome portion to form a plasma treatment layer
50 parts by weight of toluene was added to parts by weight, and the mixture was applied to both the front and back surfaces of the cover member with a spray gun and air-dried to form a primer layer. Furthermore, for 100 parts by weight of DIPLACOAT Soft SO-1501 (manufactured by Dainichiseika Kogyo Co., Ltd.), 15 parts of curing agent DAIPLACOAT EN-2 (manufactured by Dainichiseika Kogyo Co., Ltd.) is used.
Mix parts by weight and apply to both the front and back with a spray gun.
It was dried at 0 ° C. for 30 minutes to form a film. The thickness of the film (urethane resin layer) thus formed is 70 μm.

The cover member having a film formed on this surface was fixed by adhering the top surface of the key top portion to a jig forming base table with a double-sided adhesive tape. A sponge made of polyurethane foam was placed on this, and the entire cover member was pressed so as not to move uniformly, and was fixed securely and uniformly. Next, set the mold on the jig molding base stand, and in this mold, a silicone RTV for mold making, KE-1600 (made by Shin-Etsu Chemical Co., Ltd.,
After blending 10 parts by weight of curing agent Cat-1600 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) with 100 parts by weight of the product, and performing sufficient vacuum defoaming, quiet from the dome side of the cover member. It was cast in a sufficient amount. After that, cover with the presser lid and gradually pressurize with a press machine to push out the excess resin to the outside of the mold, and
Allowed to stand for a while to cure the resin. After curing, remove the presser lid, the mold, and the jig forming base, cut off unnecessary excess thickness, and peel off the cover member to remove the cover member. A fixing jig for printing for the top surface printing of the key top part was obtained, in which the uneven shape on the dome side was completely duplicated. Peeling of the cover member from the cured resin was smooth and easy due to the urethane resin layer on the surface of the cover member.

The printing fixing jig for printing on the top surface of the key top portion is fixed to a jig fixing plate of a table of a screen printing machine, and the surface of the cover member to be printed on the dome portion side is fixed to the fixing jig for printing. After mounting, the characters and symbols were screen printed on the top surface of the key top with high accuracy.

[Embodiment 2] In this embodiment, production of a printing fixing jig for printing on the back surface of a cover member will be described. A silicone paint sill mark (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) was applied on the surface of the key top portion of the cover member with a spray gun, and heated at 200 ° C. for 30 minutes to cure. The thickness of the formed film (silicone paint) is 100
μm. The cover member having a film formed on the front surface side of the key top portion was fixed by adhering the back surface thereof to a jig forming base table with a double-sided adhesive tape. A sponge made of polyurethane foam was placed on this, and the entire cover member was pressed so as not to move uniformly, and the entire back surface of the cover member was firmly and uniformly adhered and fixed to the base. Next, set the mold on the jig forming base, and in this mold, metal resin pop metal AL for molding (Kokusai Chemical Co., Ltd., trade name) 10
10 parts by weight of a curing agent for pop metal (trade name, manufactured by Kokusai Chemical Co., Ltd.) was mixed with 0 parts by weight, and a sufficient amount was gently cast from the surface side of the key top portion of the cover member. After that, the cover was covered, and the excess resin was pushed out of the mold by gradually pressurizing it with a press machine and left at room temperature for 2 hours to cure the metal resin for molding. After curing, remove the presser lid, the mold, and the jig forming base, and peel off the cover member.The uneven shape of the key top is completely duplicated on the cover member fixing surface of the printing fixing jig. A printing fixing jig for printing the back surface of the cover member was obtained.

This printing fixing jig for printing the back surface of the cover member is fixed to the jig fixing plate of the table of the screen printing machine, and the key top portion of the cover member to be printed is attached to the printing fixing jig. Characters and symbols were accurately screen-printed on the back surface of the cover member at a position corresponding to the top surface of the key top portion.

[0025]

When the printing fixing jig of the present invention having such a structure is used for screen printing on the top surface of the key top portion of the cover member or the back surface of the cover member, the fixing member for printing has a cover member. Since the concavo-convex shape of the surface facing the printing surface of is duplicated with the exact same size, the cover member is easily and accurately fitted to the printing fixing jig and held smoothly.
It is fixed and can be positioned accurately, and stable and precise printing can be performed without causing print misalignment or print unevenness. The fixing jig for printing of the present invention uses a silicone RT resin as a molding resin.
By using V or metal resin, a highly accurate printing fixing jig can be made relatively easily in a short time and at low cost without using special tools. Especially effective.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a fixing jig for printing of the present invention,
(A) is a fixing jig for printing for the top surface of the key top part, (b)
Is a fixing jig for printing for the back surface of the cover member.

FIG. 2 is a perspective view showing a state in which a cover member is incorporated in a printing fixing jig during printing, and FIG. 2 (a) is a state in which the cover member is incorporated in the printing fixing jig for the top surface of the key top portion;
(B) shows a state in which the cover member is assembled into the printing fixing jig for the back surface of the cover member.

3A and 3B are perspective views showing a cover member printed by using the fixing jig for printing of the present invention, FIG. 3A is a cover member having a number printed on a top surface of a key top portion, and FIG. The cover member has a number printed on the back surface at a position corresponding to the key top portion.

FIG. 4 is a partially enlarged cross-sectional view of a cover member used to mold a printing fixing jig for the top surface of the key top portion.

FIG. 5 is a cross-sectional explanatory view showing a mold of a printing fixing jig for the top surface of the key top portion, and (a), (b), (c) are
The molding process is shown.

FIG. 6 is a partially enlarged cross-sectional view of a cover member used to mold a printing fixing jig for the back surface of the cover member.

7A and 7B are cross-sectional explanatory views showing the mold making of the printing fixing jig for the back surface of the cover member, and FIGS. 7A, 7B, and 7C show the mold making process.

[Explanation of symbols]

 1. ..... Fixing jig for printing 2. .... Projections, 3. .... Recessed portion, 4. .... Cover member, 5. ...... Key top part, 6.・ ・ ・ ・ ・ ・ Key top surface, 7. ...... Back side, 8. .... Cover member, 9. .... Plasma treatment layer, 10. .... Primer layer, 11. .... Coating layer, 12. .... Dome part, 13. .... Jig forming base, 14. .... Double-sided adhesive tape, 15. .... Sponge, 16.・ ・ ・ ・ ・ ・ Form, 17． .... Molding resin, 18. .... Molding mold, 19. .... pot, 20. .... Presser lid,

Claims (3)

[Claims] 1. A printing fixing for fixing a push button switch cover member to a printing fixing jig, and performing printing for displaying characters, symbols, etc. on the top or back surface of the key top portion of the push button switch cover member. The jig is made of silicone resin or metal resin, and the surface of the fixing jig for fixing the cover member for the push button switch is provided with an uneven shape on the surface facing the printing surface of the cover member for the push button switch. A fixing jig for printing a cover member for a push button switch, which is characterized in that 2. A push-button switch cover member is coated with a polyurethane resin or a silicone resin on the front surface or front and back surfaces to form a film, and then the push-button switch cover member is adhesively fixed in a jig molding die, For printing of the push button switch cover member, which is characterized in that the cover member for the push button switch is cast by casting a silicone-based resin or metal resin for molding, and after curing, the cover member for the push button switch is released. Manufacturing method of fixing jig. 3. Prior to the formation of the film, the surface or front and back surfaces of the push button switch cover member is irradiated with plasma to modify the surface, and a primer is applied, and then a film of polyurethane resin or silicone resin is formed. The method for manufacturing a fixing jig for printing a cover member for a push button switch according to claim 2, wherein