JP3134209B2 - Manufacturing method of wiper blade rubber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a wiper blade rubber which has good wiping performance and durability and has high productivity.

[0002]

2. Description of the Related Art Generally, a wiper blade rubber is slid along a glass surface of a vehicle in order to wipe off water droplets or the like on the glass surface of the vehicle. Further, since the wiper blade rubber is disposed outside the vehicle, it is required to have ozone resistance and weather resistance.

FIG. 6 is a perspective view showing a conventional wiper blade rubber. In the figure, 1 is a wiper blade rubber, 2 is a base, and the base 2 is engaged with a support bracket (not shown) of the wiper. 3 is a neck part, 4 is a swing part,
5 is a lip portion, and 5a is an edge portion thereof.

[0004] As the wiper blade rubber 1, molded products such as natural rubber and synthetic rubber have been used. In particular, in the case of using natural rubber as a base material, frictional treatment is performed by a method of chlorinating or fluorinating the surface or a method of providing various coating layers 6 on the surface as shown in FIG. The resistance is reduced and the wear resistance is improved.

Also, ethylene propylene rubber (EPD)
M) and the like using a synthetic rubber as a base material have excellent weather resistance, but the effect of lowering friction by chlorination treatment cannot be expected. , Improving abrasion resistance.

On the other hand, in order to improve the productivity of the wiper blade rubber, as shown in FIG. 9, two wiper blade rubbers 1 are connected at their lip portions 5, so-called,
A molded product of the tandem wiper blade rubber 7 has been proposed. Then, the surface of the common lip portion 8 of the tandem wiper blade rubber 7 is coated as described above to form a coating film.

Then, the common lip 8 of the tandem wiper blade rubber 7 subjected to the coating treatment is mounted on a receiving stand 9 as shown in FIG. 10, for example, and a long razor is attached to the center of the common lip 8. There is a so-called pre-cut coating treatment method in which the blade 10 is pressed and separated.

Further, a common lip portion 8 of the tandem wiper blade rubber 7 in a state in which the coating process is not performed is mounted on a receiving stand 9 as shown in FIG. Press 10 and cut,
After separation, there is a so-called post-cut coating treatment method in which a coating material is applied to the surface of the lip portion 5 of each wiper blade rubber 1 by spraying or the like.

[0009]

However, in the conventional method for manufacturing a wiper blade rubber, particularly, in the coating method before cutting, it is difficult to cut at high speed because the coating film 6 is hard in the cutting step. There were problems such as wear of the cutting edge.

On the other hand, in the post-cut coating treatment method, as shown in FIG. 8, since the coating film 6 is also formed on the tip of the lip 5, there is a problem that the wiping characteristics are deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a wiper blade rubber which can maintain good wiping characteristics even when a cutting edge is formed without abrasion of a cutting edge.

[0012]

According to the manufacturing method of the present invention, a cut is made on both sides of a common lip portion, and a coating material is applied to the common lip portion.

[0013]

According to the manufacturing method of the present invention, the notch is provided on both sides of the common lip portion, and then the coating material is applied to the common lip portion.
Good wiping characteristics can be maintained.

[0014]

FIG. 1 is a perspective view showing one embodiment of a method for producing a wiper blade rubber according to the present invention. In the figure,
11 is a detailed perspective view of the tandem wiper blade rubber shown in FIG. 2, and 12a and 12b are cuts provided on both sides of the common lip portion 8 of the tandem wiper blade rubber 11, and an enlarged view of this cut is shown in FIG. . Then, as shown in FIG. 3, when the thickness D1 of the common lip portion 8 is, for example, 0.6 to 1.0 mm, the thickness D2 of the joint portion 13 formed at the center by the cuts 12a and 12b is For example, it is 0.05 mm.

Reference numeral 14 denotes an upper circular blade, and 15 denotes a lower circular blade. In addition, this tandem wiper blade rubber 11
It is fixed by a guide bracket (not shown).

The upper circular blade 14 and the lower circular blade 15 make cuts 12a and 12b on both sides of the common lip 8 as described above. And this cut 12
As shown in FIG. 4, a coating material 17 is applied to both sides of the common lip portion 8 by a coating device 16 on the tandem wiper blade rubber 11 containing a and 12b.
At this time, since the coating material 17 does not enter the cuts 12a and 12b, the edge 5 of the lip 5
The coating material 17 is not applied to a.

As the coating material, for example, nylon, graphite, molybdenum, Teflon and the like can be used. Then, after this coating step, as shown in FIG. 5, it can be easily torn by hand or by a separating mechanism (not shown),
It can be separated into two wiper blade rubbers 1.

[0018]

As described above in detail, according to the method of manufacturing the wiper blade rubber according to the present invention, in the first step, the upper circular blade and the lower side are attached to the common lip portion of the tandem wiper blade rubber. Since the cuts are made by the circular blades, the blades do not come into direct contact with each other, so that wear of the blades can be prevented. In the second step, the coating material is applied to the surface of the common lip, so that the cutting edge is not worn by the coating material. In addition, there is an effect that the coating material does not adhere to the edge of the lip portion and the wiping characteristics can be kept good.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing one embodiment of a first step of a method for producing a wiper blade rubber according to the present invention.

FIG. 2 is a perspective view showing the wiper blade rubber of FIG. 1;

FIG. 3 is a detailed cross-sectional view of the common lip of FIG. 2;

FIG. 4 is a perspective view showing one embodiment of a second step of the method for producing a wiper blade rubber according to the present invention.

FIG. 5 is a schematic perspective view for explaining separation of a wiper blade rubber in FIG. 1;

FIG. 6 is a perspective view showing a conventional wiper blade rubber.

FIG. 7 is a front sectional view of FIG. 6;

FIG. 8 is a sectional view showing a wiper blade rubber to which a conventional coating material is applied.

FIG. 9 is a schematic perspective view showing a conventional tandem wiper blade rubber.

FIG. 10 is a schematic perspective view showing a method for manufacturing a conventional wiper blade rubber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Tandem wiper blade rubber 12a, 12b Cut 13 Joining part 14 Upper circular blade 15 Upper circular blade 16 Coating device 17 Coating material

Claims (1)

(57) [Claims] 1. A method for manufacturing a wiper blade rubber comprising two wiper blade rubbers joined at a lip portion, and cutting both sides of the common lip portion with an upper rotary blade and a lower rotary blade. A method for manufacturing a wiper blade rubber, comprising cutting a cut on both sides of a common lip and applying a coating material to the common lip.