JPS6230848B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll homing method and apparatus for bending the base of a weather strip having a sheet metal insert and a protruding sponge hollow portion into a U-shape.

Conventionally, for example, a weatherstrip with a sheet metal insert inside and a protruding hollow part of a sponge was processed by bending both sides of the base into which the sheet metal insert was inserted using a roll homing device as shown in Figures 1 and 2. was being carried out. This conventional device connects the upper roller to a piston cylinder 1a,
It is equipped with three pairs of upper and lower rollers 2a, 2b, 3a, 3b, 4a, 4b which can be moved up and down by means of rollers 1b and 1c, and a weather strip 6 is inserted between these rollers, as shown in FIGS. 2 to 5. Although the bending angle was successively increased, the following problems arose.

In other words, the protruding sponge hollow part of the weather strip 6 is connected to the rollers 2a, 2b, 3a, 3b, 4.
Since the bending process is performed by inserting the insert between A and 4B, slight changes in the thickness, elasticity, and dimensions of the sponge part have a large effect on the bending dimensions and shape of the sheet metal insert, as shown in Figures 6 and 7. As a result, the weather strip cannot be bent properly and is deformed, resulting in the manufacture of defective weather strips. This is particularly noticeable when the width of the sheet metal insert inserted into the weatherstrip is narrow, since the pressing force for bending becomes large. Furthermore, as shown in Figure 6, the bending moment is greatest at the center of the sheet metal insert, so even if you try to bend it into a U-shape, this part will be rounded, making it impossible to form a horizontal surface and causing the sheet metal insert to bend into a U-shape. It was extremely difficult to do so. In addition, as the bending process of the weather strip 6 progresses, the flanges of the second and third upper rollers 3a and 4a are pushed in while contacting the weather strip 6, which may damage the outer surface of the weather strip 6 or damage the outer skin. There were flaws.

This invention was made in order to eliminate the above-mentioned drawbacks, and it is possible to bend the base of a weather strip having a sheet metal insert and a protruding sponge hollow part into a proper U-shape, and it also avoids damage to the surface of the molded product. The purpose of the present invention is to provide a roll homing method and device that can perform bending without bending.

Embodiments of the present invention will be described below based on the drawings.

Figure 8 is a front view of the roll homing device, Figure 9
The figure shows an enlarged view of the left side. This roll homing device has a weather strip 6 having a shape as shown in FIG. 16, with a sponge hollow part 6a protruding from the approximate center of a base 6c as shown in FIG. 15, and a weather strip 6 having a sheet metal insert 6b inside the rubber-like elastic body. It is a bending device, and is configured to bend the base 6c into which the sheet metal insert 6b is inserted into an appropriate U-shape using five sets of rollers.
Reference numeral 7 denotes a guide arranged at the product entrance of this device for positioning the weather strip 6. Immediately behind the guide is a reversing roller 8, and further behind it a conical roller 9 for folding down the sponge hollow part 6a. It is arranged at an angle with respect to the direction of travel. Reference numerals 10 and 11 are a first upper roller and a first lower roller that are disposed one above the other immediately after the conical roller 9, and this pair of rollers has a U-shaped central part of the flat base of the weather strip 6. As a preparatory step for bending into a V-shape, a concave portion 11a and a convex portion 10a are formed, and the first upper roller 10 is connected to a rod of a piston cylinder 13 via a shaft 12, and is movable up and down. (Figure 10). The first lower roller 11 serves as a driving roller. 14
is a drive-type second lower roller disposed next to the drive-type second lower roller 11 disposed next to the first lower roller, and has a recessed portion almost similar to the first lower roller 11 in the center. 14a. 15 and 16 are located above the second lower roller 14 and are attached to the hanger block 17 at a certain angle to the rotation axis of the second lower roller 14.
This is a driven type second upper roller that is pivotally supported. The roller shapes of the two second upper rollers 15 and 16 are formed so as to perpendicularly contact the side surface of the base 6c of the weather strip 6 and bend the base 6c by a certain angle, and the hanger block 17 is formed so that the rod of the piston cylinder 18 It is connected to and can move up and down (Fig. 11). Reference numeral 19 denotes a drive-type third lower roller disposed next to the second lower roller 14. Its shape is thinner than that of the second lower roller 14, and a similar recess 19a is formed in the center. Third upper rollers 20 and 21 similar to the second upper rollers 15 and 16 are disposed above the third lower roller 19 and are pivotally supported by a hanger block 22, and the hanger block 22 is connected to a rod of a piston cylinder 23. (12th
figure). Furthermore, third upper and lower rollers 19, 20, 21
Next, a fourth lower roller 24 and two fourth upper rollers 25 and 26 are arranged in the same way as the previous rollers, and the shape of these rollers is similar to that of the base 6 of the weather strip 6.
A hanger block 27, which is formed so that c is bent more closely into a U-shape and pivotally supports the fourth upper rollers 25 and 26, is connected to a rod of a piston cylinder 28 (FIG. 13). 4th upper and lower roller 2
4, 25, 26, that is, at the rearmost part of the roll homing device, there is a driven staking roller 29,
30 is arranged so that the distance between its axes can be changed, and has a roller shape that can bend the advancing weather strip 6 into the final U-shaped cross section (the first
Figure 4).

This roll homing device performs U-shaped roll homing of the weather strip as follows.

The weather strip 6, which has been positioned by the guide 7 at the front end of the device, is bent by the reversing roller and raised vertically.Then, the conical roller 9 pushes down the protruding sponge hollow part 6a to the side, and in this state the weather strip 6 is wound around the first lower roller 11 and inserted between it and the first upper roller 10 while being pressed (FIG. 9). By these first upper and lower rollers 10 and 11, the flat base of the weather strip 6 is bent at the center into a V-shape, and the base 6c is preformed to be bent into a U-shape. At this time, since the sponge hollow portion 6a is tilted to the side, it is possible to bend the sponge in a V-shape without any variation in shape without intervening the sponge portion in the center.
Weather strip 6 with a V-shaped bend in the center
Next, the second upper roller 1 enters between the second upper and lower rollers 14, 15, and 16, and moves the base 6c from a predetermined position downward on both sides with the sponge hollow part 6a protruding.
Bending is performed by pressing at steps 5 and 16. The weather strip 6 is then moved to third upper and lower rollers 19, 20,
21, and further between the fourth upper and lower rollers 24,
25 and 26, the left and right sides of the base are sequentially bent, approaching a U-shape. At this time, the first
The central portion preformed into a V-shape by the upper and lower rollers 10 and 11 has a second lower roller 14, a third lower roller 19,
By being pressed from the back side by the fourth lower roller 24, the bending is gradually restored, and the flange portions 20a and 21a of the third upper rollers 20 and 21 and the flange portion 25a of the fourth upper rollers 25 and 26 are ,26
The point a contacts the center of the weather strip 6 and acts to prevent the center from rising roundly due to bending of the sides, and to equalize the bending angles of the left and right sides. Fourth upper and lower rollers 24, 25,
The weather strip 6 sent out from the weather strip 26 then enters between the caulking rollers 29 and 30, bends the opening angle of the remaining side portions at right angles, is formed into the cross-sectional shape shown in FIG. 16, and is shaped into a predetermined shape. It becomes a product of

As described above, according to the roll homing method and device of the present invention, there is provided a conical roller which tilts the protruding part of the weather strip outward, which has a protruding part in the approximate center of the base part, and a V-shaped roller in the central part of the base part of the weather strip. a first upper and lower roller that is preformed into a shape;
A roll homing device is constructed by sequentially arranging at least one set of U-shaped bending rollers consisting of an upper roller and a lower roller, and a pair of caulking rollers in the direction of movement of the molded product. The part is first bent into a V-shape, and then both sides of the molded part are bent in the direction of returning the V-shaped center part to horizontal, creating a U-shaped cross section. However, it is possible to bend it into a proper U-shape without causing roundness in the center, and by using two upper rollers, the rotation axis of these upper rollers is brought parallel to the surface of the weather strip, Since the outer circumferential surface of the upper roller is molded in contact with the weather strip, there is no slippage between the roller surface and the weather strip due to the difference in circumferential speed as in the prior art, and it is possible to prevent damage to the weather strip surface.

[Brief explanation of the drawing]

1 to 7 show a conventional roll homing device and its molded product, FIG. 1 is a schematic front view of the roll homing device, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is the same. B-B sectional view, Figure 4 is the same C-
C sectional view, FIG. 5 is a DD sectional view, and FIGS. 6 and 7 are cross sectional views of the molded product after bending. 8th
16 to 16 show the roll homing device of the present invention and its molded product, FIG. 8 is a schematic front view of the roll homing device, FIG. 9 is a left side view of the roll homing device, and FIG.
Figure 0 is a sectional view taken along E-E in Figure 8, and Figure 11 is a cross-sectional view taken along line F- in Figure 8.
F sectional view, FIG. 12 is a GG sectional view, FIG. 13 is a HH sectional view, FIG. 14 is a J-J sectional view,
Figure 15 is a cross-sectional view of the molded product before bending, Figure 16
The figure is a cross-sectional view of the molded product after bending. 6...Weather strip (molded product), 6a...
Sponge hollow part (protruding part), 6b... Sheet metal insert, 9... Conical roller, 10... First upper roller, 11... First lower roller, 14... Second lower roller, 15, 16... 2nd upper roller, 19...3rd
Lower rollers, 20, 21...Third upper roller, 24...
...4th lower roller, 25, 26...4th upper roller,
29,30...Caulking roller.

Claims (1)

[Scope of Claims] 1. In a roll homing method of bending the base of a weather strip having a protrusion at approximately the center of the base and a sheet metal insert in the base into a U-shaped cross section, the protrusion is moved laterally. After the flat center of the base is bent into a V-shape and preformed, two upper rollers press both sides of the base, and one lower roller presses the center of the base on the back side. By pressing from
1. A method for roll homing a weather strip, which comprises bending the base portion in a direction to return the central portion of the letter shape to a horizontal direction, and bending the base portion into a U-shaped cross section. 2. A roll homing device for bending the base of a weather strip having a protrusion at approximately the center of the base and a sheet metal insert in the base into a U-shaped cross section, including a conical roller that tilts the protrusion laterally; a first upper and lower roller that preforms the central portion of the flat base into a V-shape; at least one set of U-shaped bending rollers consisting of two upper rollers and one lower roller; and a pair of caulking rollers. 1. A roll homing device for a weather strip, characterized in that a weather strip roll homing device is provided in which the weather strips are sequentially arranged in the advancing direction of a molded product.