JPH0522569B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Industrial Field of Application) This invention is an object of the present invention that is attached to a flange on the periphery of a body opening such as a trunk or door of a vehicle such as an automobile, and is installed between the trunk, door, etc. The present invention relates to a method of manufacturing a weather strip for sealing.

(Prior Art) Conventionally, this type of weather strip has been manufactured by the method described below. That is, when manufacturing a weather strip using an insert as shown in FIG. 10, for example, an insert made of rubber or synthetic resin is placed on the outer periphery of an insert 42 made of a band-shaped metal plate with holes 41 punched out at predetermined intervals using a press machine. After the rubber-like elastic body is coated in a substantially flat plate shape by coextrusion molding, the bone fragments 4 of the insert 42 are bent due to bending fatigue.
The bridging portion 44 between the three is separated. Thereafter, it was bent into a U-shaped cross section using a bending machine, and the long weather strip was cut to a desired length using a guillotine blade or a thin grinder plate to a specified length.

(Problems to be Solved by the Invention) However, in the above method, when cutting the long weather strip to a certain length, not only the bridging portion 44 but also the bone fragments 43 themselves may be cut. Therefore, the bone fragments 43 of the insert 42 may be exposed at the cut end, or the insert 42 may be compressed during cutting, resulting in deformation of the weatherstrip. The present invention attempts to solve these problems.

Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention embeds a band-shaped insert in which a large number of bone fragments are connected by bridging parts in a polymeric material. In addition, in this method of manufacturing a weatherstrip in which the insert in the polymeric material is divided into a number of bone pieces and then cut into a predetermined length, the space between the specific bone pieces of the insert and the a marking position specifying step in which marking positions are set at intervals approximately equal to a predetermined length of the weather strip, and the marking positions are specified by a dimension sensor and a memory control circuit; an extrusion molding step of coating a polymer material on the polymer material, and a step provided before or immediately after the extrusion molding step,
a supply length measurement step in which how far the specific marking position has moved is measured by a distance meter and the memory control circuit issues a signal to the marking process; and a signal emitted in the supply length measurement step. a marking step in which a thin mark is placed on the polymeric material corresponding to the specific marking position in response to a signal while moving in synchronization with the movement of the weather strip; and a separation step in which the insert is separated into a number of bone fragments. and a cutting step of detecting the mark made in the marking step and cutting on the mark.

(Function) In the present invention, in the marking position identification step of the strip-shaped insert sent out from the drum, the marking position is determined between specific bone fragments that will be separated in the subsequent separation step and become the ends, and the supply length is also measured. The process starts measuring a predetermined distance from this specific marking position. In the extrusion molding process, the surface of this strip-shaped insert is coated with a polymeric material. After that, in the marking step, the predetermined distance measured in the supply length measuring step, that is,
Marking A thin mark is placed on the polymer material corresponding to a specific position. After the weatherstrip insert is separated into bone fragments in a separating step, the mark is detected and cut on the mark in a cutting step. By sequentially repeating this process, weatherstrips of a predetermined length are continuously manufactured by cutting between the set bone fragments.

(Embodiment) An embodiment in which the present invention is applied to a method of manufacturing a weather strip for an automobile will be described with reference to FIGS. 1 to 7.

As shown in Figures 5 and 6, as a polymer material
An insert 3 separated into a plurality of bone pieces 2 is embedded inside a weather strip 1 made of EPDM solid rubber 8 and having a U-shaped cross section. This insert 3 is manufactured by punching out holes 4 from a band-shaped metal plate using a press machine. That is,
As shown in Figure 7, the hole (space) 4 has a wide width.
By punching holes 4a and narrow holes 4b alternately at predetermined intervals, the insert 3 has a bone fragment 2 having a narrow hole 4b and a pair of bridging portions 5 that connect adjacent bone fragments 2. The structure consists of alternating lines. Since these bridging portions 5 are formed thin at the same time as the wide hole 4a is punched out, they are easily cut approximately at the center due to bending fatigue. The final shape of the insert 3 of the weather strip 1 is such that the bridging portions 5 are separated from each other, as shown in FIG.

As shown in FIG. 5, two pairs of retaining lips 6 are formed on the inner wall of the weather strip 1.
When this weather strip 1 is attached to a flange on the periphery of a body opening such as a trunk or a door of an automobile (not shown), the flange is held. Furthermore, a hollow seal portion 7 made of EPDM sponge rubber is adhered to the outer wall of the weather strip 1.

Next, a method of manufacturing the weather strip 1 constructed as described above will be explained.

First, an apparatus for manufacturing the weather strip 1 of this embodiment will be explained with reference to FIGS. 1 to 4.

An extruder 12 is disposed in front of the drum 11 around which the insert 3 is wound (on the right side in FIG. 1), and a supply device 13 for supplying rubber to the extruder 12 is disposed on the side thereof. It is set up. A pair of opposing rollers 14 are disposed in front of the extruder 12 for taking over the weather strip 1 extruded from the extruder 12. A dimension sensor 21 made of a phototube and a distance meter 22 are provided between the drum 11 and the extruder 12, respectively. The same size sensor 21 is connected to the drum 1.
The wide holes 4a between the bone fragments 2 of the insert 3 sent out from the insert 3, that is, the bridging portion 5 portion separated by the cutting portion described later, are detected, and the specific position thereof is specified as the marking position. Then, the distance meter 22 uses this marking specific position as the dimension measurement start position, and the insert 3 from the time of the dimension measurement start.
It is designed to measure the sending distance.

A marking device 23 is provided between the extruder 12 and the roller 14 to mark the cutting position on the weather strip 1 whose surface is coated with unvulcanized rubber. The marking device 23 includes a marking pen 26 attached to a bottom plate 24 so as to be movable up and down by an air cylinder 25, and a pulse motor 28 for moving the marking pen 26. A pinion 29 is attached to the output shaft of the pulse motor 28, and the air cylinder 25 is attached to the rack 30 meshed with the pinion 29.
is attached to the marking pen 26, and as the pulse motor 28 rotates, the marking pen 26 moves back and forth along the weather strip 1.

The marking device 23, dimension sensor 21, and distance meter 22 are each connected to a storage control device 31. When the measurement start signal is input to the memory control circuit 31, the memory control circuit 31 outputs a marking signal based on the signal detected by the dimension sensor 21 and the signal detected by the distance meter 22. I'm starting to do that. Therefore, when a dimension measurement start signal is input to the memory control circuit 31, the dimension sensor 21 detects the wide hole 4a of the holes 4 corresponding to the bridging portion 5 that will be separated later. At the same time, the distance meter 22 starts measuring the moving distance of the specified wide hole 4a. That is, the dimension sensor 21 and the memory control circuit 31 form a marking position specifying process, and the distance meter 22 and the memory control circuit 31 form a supply length measuring process. Further, the pulse motor 28 is rotated by a signal from the memory control circuit 31 to move the marking pen 23 at a speed equal to the feeding speed of the insert 3 and mark the surface of the weather strip 1. It's summery. Note that the distance meter 22 may be placed immediately after the extruder 12.

A vulcanization tank 15 for vulcanizing rubber is formed in front of the roller 14, and a plurality of rollers 17 are provided in front of the roller 14 to separate the insert 3 into each bone piece 2 by bending fatigue. is installed. Further, in front of the roller 17, a bending machine 19 is provided for bending the weather strip 1 into a U-shaped cross section.

Further, a weather strip cutting device 32 is disposed in front of the bending machine 19. This cutting device 32 includes a mark detection section 33 that detects the mark, and a cutting control section 32 that outputs a cutting signal when a signal is input from the mark detection section 33.
and a cutting section 35 which descends and cuts the weather strip 1 in response to this cutting signal.
Therefore, when a mark is detected by the mark detection section 33, the mark detection section 33 outputs a detection signal. When this detection signal is input to the cutting control section 34, the cutting control section 34 outputs a cutting signal to stop feeding out the weather strip 1, and also lowers the cutting section 35 to remove the weather strip. It is designed to cut the pipe 1. At this time, the dimension sensor 21 and the memory control circuit 3
1 so that the cutting position is at the center of the wide hole 4a of the insert 3, that is, at the bridging portion 5, so that the bone fragment 2 is exposed at the cut end of the weatherstrip 1. I've learned not to.

Next, use this device to apply the weather strip 1.
Explain how to manufacture.

First, take out the insert 3 from the drum 11, and place the insert 3 into the dimension sensor 2.
1 and the detection corresponding portion of the distance meter 22 in order, and then guided into the extruder 12. Then, in the extrusion molding process, the insert 3 is extruded in an extruder 12 with its outer periphery coated with EPDM solid rubber 8 and EPDM sponge rubber for forming the seal portion 7 by co-extrusion molding. Further, in this extrusion molding process, the rubber coated on the insert 3 is still in an unvulcanized state, and the mark is applied to the surface of the rubber in this state.

In this marking method, as shown in FIGS. 4a to 4d, when a dimension measurement start signal is output from a switch (not shown), in the marking position specifying process, as shown in FIG. 4a, the dimension sensor 21 In addition to distinguishing between the wide hole 4a and the narrow hole 4b of the insert 3, the marking specific position P is set when the center of the wide hole 4a first appears on the dimension sensor 21, and a reference signal is generated. It is output to the storage control circuit 31. In other words, the bridging portion 5 to be separated in a later separation process is specified as the specific marking position P. Further, upon receiving this reference signal, in the supply length measuring process, the distance meter 22 starts measuring a predetermined distance from the specific marking position P, and when the predetermined distance L is reached, as shown in FIG. Then, the storage control circuit 31 newly outputs a dimension measurement start signal. Then, Figure 4c
The next marking specific position P' is detected by the dimension sensor 21 as shown in FIG. Then, when the specific marking position P reaches the position of the marking pen 26, that is, when the supply length of the insert 3 from the specific marking position P reaches S in the supply length measuring process, the memory control circuit 31 issues a mark signal to the marking process. , as shown in FIG. 4d, while moving the marking pen 26 in the advancing direction at a speed equal to the extrusion speed of the extruder 12, a thin mark is made on the rubber at the specific marking position P. Therefore, it is possible to prevent the marking pen 26 from being dragged on the weather strip 1 and forming a thick line during marking, and a thin mark can be made on the weather strip 1.

Thereafter, the weather strip 1 is vulcanized by passing through a vulcanization tank 15, and is sent to a roller 17 for the next separation step. By passing between the rollers 17, the weather strip 1 bends and fatigues the bridging portion 5 between the bone fragments 2 of the insert 3, causing the bone fragments 2 to separate.

Next, the weather strip 1 passes through the bending machine 19 and is bent from a flat plate shape into a U-shaped cross section.

In the cutting process, when the mark portion of the weather strip 1 bent and formed into a U-shaped cross section is sent to the cutting device 32, the mark detection section 3
3 detects the same mark and outputs a mark signal.
When this signal is input to the cutting control section 34, the cutting control section 34 outputs a cutting signal to the cutting section 35 to stop feeding out the weather strip 1 and lower the cutting section 35 to the marked portion. By doing this, the weather strip 1 is cut to a predetermined length. At this time, the mark part is the wide hole 4a.
The weather strip 1 is not cut on the bone fragment 2 because the weather strip 1 is cut on the bone fragment 2. By repeating the above method, weatherstrips 1 in which almost no bone fragments 2 are exposed at the incisions can be continuously manufactured.

Therefore, according to this embodiment, since the cutting portion of the weather strip 1 is limited to the bridging portion 5 of the insert 3, the weather strip 1 can be cut with a small force. Furthermore, the insert 3 inside the weather strip 1 will not be pressed by the cutting portion 35 and deformed.

In addition, since almost no metal insert 3 is exposed at the cut, when it is assembled into an automobile, even if water enters the weather strip due to long-term use, there is almost no exposed metal part, so it will not rust.

Additionally, since almost no metal parts are exposed at the cut edges, workers' hands will not be injured when assembling it into a car.

Further, in the marking device 23, since the pulse motor 28 is used to move the marking pen 26, the accuracy during marking can be improved.

Note that the present invention is not limited to the above-mentioned embodiments, and can be embodied as follows, for example.

(1) The shape of the insert 3 may be the lath type 38 shown in FIG. 8, or the shape shown in FIGS.
Other shapes, such as the general inserts 39, 42 shown in Figure 0, may also be used.

In the lath type 38 shown in FIG.
The bridging portions 46 that are formed in between and connect adjacent bone fragments 45 at four locations are cut. Furthermore, in the insert 39 shown in FIG. 9, the bone fragment 5
A pair of bridging portions 51 that are formed between the two bone fragments 50 and connect adjacent bone fragments 50 are cut. however,
In the insert 42 shown in FIG. 10, the bridging portion 44 must be shaped so that it can be broken due to fatigue failure.

(2) In addition to the weather strip 1, the present invention may be implemented as a weather strip without a seal portion 7, a glass run, or the like.

Effects of the Invention As described in detail above, the present invention allows accurate cutting between the separated bone fragments of the insert when cutting the weatherstrip, so that the bone fragments of the insert can be accurately cut between the separated bone fragments of the insert. can be reliably prevented from being exposed. In addition, without making any major changes to the conventional equipment, by simply adding a phototube for the marking position identification process, a mark device for the marking process, and a memory control that controls both of the above processes, it is possible to move between the bone fragments. This has the excellent effect of making it possible to cut.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a manufacturing device embodying the present invention, FIG. 2 is a perspective view showing a dimension sensor, distance meter, bending machine, and marking device of the device shown in FIG. 1, and FIG. Perspective view showing the cutting device, No. 4
Figures a to d are schematic views of main parts showing the marking method of the present invention, Figure 5 is a cross-sectional view of the weather strip manufactured by the present invention, and Figure 6 is the weather strip shown in Figure 5. FIG. 7 is a perspective view showing the insert embedded in the lip, FIG. 7 is a plan view showing the insert in FIG. 6 before being bent and separated, and FIG. 8 is a different example of the insert of this example. FIG. 9 is a plan view showing another example of the insert, and FIG. 10 is a plan view showing another example of the insert. weather strip 1, bone fragment 2, insert 3, wide hole 4a as a space, bridging part 5,
EPDM solid rubber 8 as a polymer material, an extruder 12, a dimension sensor 21, a distance meter 22, and a memory control circuit 31.

Claims (1)

[Claims] 1. A belt-shaped insert 3 in which a number of bone fragments 2 are connected by bridging portions 5 is embedded in a polymeric material, and the insert 3 in this polymeric material is
In the method for manufacturing a weatherstrip, the space 4a between the specific bone pieces 2 of the insert 3 is divided into a large number of bone pieces 2, and then cut into a predetermined length.
and a marking position specifying step of setting marking positions at intervals approximately equal to a predetermined length of the weather strip 1 to be obtained, and specifying the marking positions by a dimension sensor 21 and a memory control circuit 31; 3 to the extruder 12 and coating the insert 3 with the polymeric material 8; and a distance meter provided before or immediately after the extrusion molding step to measure how far the specific marking position has moved. 22, and a signal is emitted to the marking process by the memory control circuit 31; Polymer material 8
a marking step in which a thin mark is placed on the top while moving in synchronization with the movement of the weather strip 1; a separation step in which the insert 3 is separated into a large number of bone pieces 2; and a mark made in the marking step. A method for manufacturing a weather strip, characterized in that the steps of detecting the mark and cutting on the mark are sequentially performed.