JPH01264827A - Manufacture of weather strip - Google Patents

Abstract

PURPOSE:To prevent generation of flashes and an extrusion line by eliminating division of a circumferential wall of an orifice, by a method wherein a weatherstrip which is extruded under a state where it is almost not flexible or having a foreseeable flexible factor and unvulcanized is deformed partly into a fixed state by applying pressing force to the weather strip from the outside and then the same is vulcanized. CONSTITUTION:Along with introduction of an insert 39 made of a sheet metal into a head 30 also a rubber material is introduced into the head 30 through ducts 31, 33 and a plastic deformation of a hollow seal part 3 of a weather strip (w) which is extruded and in an unvulcanized state is performed partly by applying pressing force to the hollow seal part 3 from the outside. The pressing force is applied to the same by making use, for example, of a shaping device 40, the deformed parts are formed at constant intervals, vulcanization is performed by passing the same through a vulcanizing tank 37 as it is and cut the same into pieces of an even length. In addition, the shaping device 40 is provided with an amount of movement detecting device 50, control device 70 and shaping means 80 and when an amount of extrusion movement arrives at a predetermined amount of movement, a motor 91 is turned with a signal from a control device 70 and a pressing part 81 is made to approach the strip (w). This turning amount is applied to the control device 70 and controlled driving of the motor 91 is performed so that the turning amount of the motor 91 runs after a predetermined chart.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of manufacturing a weatherstrip having a deformed portion and an apparatus used in this manufacturing method. The weather strip manufactured by this invention is for vehicle window frames,
It is suitable as a weather strip for luggage, sunroof, etc., and its hollow seal part 2 (see Fig. 8)
For attachment, a deformable portion is formed on the lip portion 4, seal lip portion 6, etc. to accommodate a portion of a corner having a small radius of curvature.

<Prior art> Conventionally, a weather strip W having a deformable portion 10 is
There is one shown in Figures 9 and 10 (Japanese Unexamined Patent Publication No. 59-171
(See Publication No. 735). This weatherstrip W is composed of an attachment part 1 and a hollow seal part 3. For installation, a sheet metal insert 5 is buried in the part 1, and
Three lips 9 are formed to securely grip the body flange 7. Then, the hollow seal part 3a at the position corresponding to the corner part 13 of the window frame 11 (see FIG. 11) is installed in the direction in which it protrudes from the part 1 (see FIG. 9).
It has been transformed (upward in the figure). As a result, when the weather strip W is attached to the window frame 11, the hollow seal portion 3
The shape of the corner part 3a and the straight part 3b are
The cross-sectional shape is .

Note that in the weather strip without the deformed portion 10, the hollow seal portion 3a at the corner portion 13 of the window frame 11 is
As shown by the imaginary two-dot chain line in FIG. 11, the cross-sectional shape of the hollow seal portion 3 is
a and the straight portion 3b are different. In this case, there is a possibility that the sealing performance of the weather strip W varies.

The weatherstrip W having the deformed portion 10 was formed as follows.

First, the head 20 (
(see Fig. 12), unvulcanized weatherstrip W (in this specification, unvulcanized weatherstrip is denoted by "W", and vulcanized weatherstrip is denoted by rWJ). Extrude. The peripheral wall of the orifice 21 is divided into a movable body 22 and a fixed body 24. During this extrusion molding, the deformable portion 10 is formed by sliding the movable main body 22 at regular intervals. In addition, the head 20
Two ducts 23, 25 are arranged so that the mounting part 1 and the hollow seal part 3 are made of different materials.

Further, the insert 5 is introduced into the head 20 from the same direction as the duct 23 in the installation part.

Then, the extruded unvulcanized weather strip W is passed through a vulcanization tank, cut into a predetermined length (so that the deformed portion 10 fits into the corner part 13 of the window frame 11), and the product is manufactured. Let's call it weatherstrip W.

<Problems to be Solved by the Invention> However, in the above manufacturing method, in order to change the shape of the orifice 21 of the head 20 by moving the movable body 22, the peripheral wall of the orifice 21 is connected to the movable body 22 and the fixed body 2.
It is divided into 4. Therefore, there is a risk that extrusion streaks may occur due to the movement of the movable main body 22 during extrusion, or that cracks may occur due to poor fitting.

In order to prevent this, conventionally, the machining accuracy (including adjustment of the fit) between the movable body 22 and the fixed body 24 has been made as high as possible. However, it was not possible to completely prevent the occurrence of extrusion streaks and cracks. Further, in the conventional head 20, a drive device (
Motors, gears, etc.) used to have to have enough driving force to move the movable body 22 due to the pressure of the material applied to it and the resistance of the mating parts, which was a factor that increased the cost of the device. .

In other words, conventional weatherstrip manufacturing methods not only cannot completely prevent the occurrence of extrusion streaks and cracks, but also
The cost of equipment used to carry out this manufacturing method has been high.

Means for Solving the Problems> As a result of repeated studies to solve the above problems, the present inventors have come up with the following invention.

That is, by applying a pressing force from the outside to the unvulcanized weatherstrip that has been extruded to a state where it is almost inelastic or has a predictable expansion/contraction rate and is still moving,
This is a method for manufacturing a weatherstrip, which is characterized by partially plastically deforming the weatherstrip and then vulcanizing it.

Further, this manufacturing method is carried out using a weather strip device having the following configuration.

In other words, it is a device that partially plastically deforms an unvulcanized weatherstrip that is extruded to a state where it is almost impossible to expand or contract or has a predictable expansion/contraction rate, and is still moving. 8-speed detection means that detects and outputs a movement amount signal, and compares the movement amount of the weatherstrip obtained based on the movement amount signal with a set movement amount of the weatherstrip that has been input in advance, and outputs a drive control signal. What kind of weather strip is characterized by comprising: a control means for pressing the pressing part against the weather strip or separating the pressing part from the weather strip based on a drive control signal; It is a shaped device.

<Example> Hereinafter, this invention will be explained in more detail based on examples.

Note that the same members as those used in the explanation of the conventional example are given the same reference numerals, and the explanation thereof will be partially omitted. The description of the embodiments will also first refer to the overall manufacturing process and then to the shaped device 40 for plastically deforming the unvulcanized weatherstrip.

FIG. 1 is a process diagram of a method for manufacturing a weather strip according to an embodiment. This manufacturing method includes: ■ extrusion molding of an unvulcanized weatherstrip W; ■ this weatherstrip W
It consists of a process of plastic deformation, ■vulcanization process, and ■cutting process.

■Extrusion molding process of unvulcanized weatherstrip W The sheet metal insert 29 is introduced into the head 30 by the two pairs of feed rollers 27, and the rubber material (EPDM etc.) is also introduced into the head 30 from the duct 31.33. A weather strip W in an unvulcanized state is formed in the same manner as in the conventional method.

Since the sheet metal insert 29 is embedded in the unvulcanized weatherstrip W, its axial length hardly expands or contracts even after extrusion.The material of the insert is almost non-expandable. The material is not limited to the above-mentioned sheet metal material as long as it has a predictable expansion/contraction ratio. For example, a belt-like material braided with metal fibers or synthetic fibers can be used (Japanese Patent Application Laid-open No. 59-11404
(See Publication No. 0, etc.)

■A pressing force is applied from the outside to the hollow seal portion 3 of the unvulcanized weatherstrip W, which is pushed out from the process head 30 that plastically deforms the unvulcanized weatherstrip W and is still moving. is partially plastically deformed. Note that the part that can be plastically deformed is not limited to the hollow seal part 3; in the attachment shown in FIG. 8, the lip part 4 and the seal lip part 6 can also be plastically deformed. Further, the direction in which the pressing force is applied is not particularly limited, and the pressing force can be applied from a direction perpendicular to the moving direction of the weatherstrip, an inclined direction, a direction coaxial with the transverse movement axis, etc. Furthermore, the hollow seal portion 3 can also be deformed in a sandwiching manner.

Also, the timing of applying the pressing force is not particularly limited as long as the vulcanization progresses and the weather strip is not yet hardened.It may also be applied when the weatherstrip is softened during the vulcanization process in order to make it easier to deform. can. If a large deformation is required, the timing of pressing can be spread out to reduce the pressing force per location.

Reference numeral 35 in the figure is a take-up roller.

As a means for applying a pressing force, a device 40 of some shape, which will be described later, is used, but of course it is not limited to this.

Note that the pressing force is applied periodically to form deformed portions at regular intervals in the continuously extruded weather strip W.

■Vulcanization process In this process, the unvulcanized weatherstrip W being moved is passed through the vulcanization tank 37 as it is.The vulcanization method includes a combination of microwave vulcanization and hot air vulcanization. A general continuous vulcanization method can be adopted.

Through this step, the deformed portion formed in the previous step is made permanent.

■Cutting process Up to now, the weather strip W has been manufactured continuously. Therefore, the deformable portion is trimmed to a predetermined length so as to fit into, for example, a corner of a window frame.

As a result, a weather strip W as a product is obtained.

Next, the running device 40 of the embodiment will be explained.

This multi-type equipment 40 includes (a) a movement amount detection means 50, (b) a control means 70, and (a) a movement means 80.

(a) The movement detecting means 50 detects the roller 5 as shown in FIG.
1 and a rotary encoder 53, and is arranged near the extrusion port of the head 30. The roller 51 is pivotally supported by a frame 55 with its curved surface in contact with the lower surface of the unvulcanized weatherstrip W. And that axis 5
7 is connected to the rotating shaft of a rotary encoder 53. Therefore, as the weather strip W moves, the roller 51 is driven to rotate, and the rotary encoder 53 is rotated in synchronization with the roller 51. As a result, the amount of linear movement of the weather strip W is converted into the amount of rotation of the rotary encoder 53, and the amount of movement corresponding to the amount of rotation is converted! A signal (pulse signal) is output.

In the example of FIG. 2, the roller 51 is brought into contact with the lower surface of the weather strip W, but of course it can be brought into contact with the upper surface or side surface of the weather strip W. Furthermore, as shown in FIG. 3, when forming a fine uneven pattern such as a weather strip W uneven pattern, the rotary encoder 53 can be connected to the pattern forming roller 61. Thereby, slippage between the weather strip W and the pattern-shaped roller roller 61 can be reliably prevented. In addition, the reference numeral 63 in the figure is a presser roller, and the reference numeral 65 is a embossed roller unit.

Further, the position of the roller 51 is not particularly limited either, and for example, it can be brought into contact with the insert 29, or it can be brought into contact with the weather strip W after the shaping means 80 in FIG.

Above, we have explained the method of converting the amount of movement of the weatherstrip W into the amount of rotation and then detecting this. However, in order to detect the amount of movement of the weatherstrip W, there are other methods such as an optical method,
A known method such as an air method can be adopted.

(a) The movement amount signal output from the rotary encoder 53 described above is manually input to the control means 70. This control means 70 compares the set movement amount of the weatherstrip input in advance with the current movement amount of the weatherstrip obtained by integrating the movement amount signal, and also compares the rotation amount signal (pulse) of the motor 91, which will be described later. The current rotation amount of the motor 91 (corresponding to the current position of the pressing part 81) obtained by integrating the signal (input from a rotary encoder 92 described later) and the set rotation amount of the motor 91 that has been input in advance. It includes a CPU programmed to compare and output a drive control signal based on the comparison result. In response to this drive control signal, the shaping means 80 is actuated, and a pressing force is applied to a predetermined position of the unvulcanized weather strip W from a direction perpendicular to its moving direction.

Note that the set movement amount of the weather strip and the set rotation amount of the motor can be changed as appropriate using an external input device.

(1) The drive control signal output from the control means 70 described above is input to the driving means 80. The moving means 80 includes a pressing section 81 and an 8-movement device 83 thereof.

A driven roller was used as the pressing portion 81. This is to prevent streaks or the like from forming on the pressed portion when the pressing portion 81 is pressed against the unvulcanized weatherstrip W. To further ensure this, the roller 99 should be
This roller 99 is preferably as shown in the figure.
has a peripheral surface shaped along the surface of the hollow seal portion 3.

This prevents the roller 99 from making uneven contact with the hollow seal portion 3. Furthermore, since this roller 99 is divided into three parts, each divided part can easily follow the hollow seal portion 3 and rotate. Therefore, the hollow seal portion 3 is almost never hit and scratched.

Of course, it is possible to divide this roller into two or four or more parts, and it is not necessary to divide it, but depending on the material of the weather strip W or the formation position of the deformed part, etc.
Instead of the driven roller, a leading rod 8 shown in FIG.
5 etc. can also be used. Furthermore, the pressing part 81 can also be used as a driving roller.

The moving device 83 includes a support member 87 of the pressing portion 81 and a screw 89.
, a motor 91 and a rotary encoder 92. In addition, the reference numeral 93 in the figure is a base, and the reference numeral 95 is a guide for the support member 87. The support member 87 is arranged in a threaded pair with respect to the screw 89, and the screw 89 is fixed to the rotating shaft of the motor 91. As a result, the support member 87 moves in the axial direction of the screw 89 in accordance with the amount of rotation (number of rotations, direction of rotation) of the motor 91. A servo motor, a step motor, or the like is applied to the motor 91. A rotary encoder 92 is also connected to the rotating shaft of the motor 91, and outputs the amount of rotation of the motor 91 as a rotation amount signal.

Then, the drive control signal from the control means 70 is applied to the motor 91.
When input to the motor 91 starts rotating,
A rotation amount signal of the motor 91 is fed back from the rotary encoder 92 to the control means 7o. Based on this rotation amount signal, the control means 70 compares the current rotation amount of the motor 91 with a set rotation amount inputted in advance, and controls the motor 91.
A drive control signal to rotate the motor 91 according to the set rotation amount is output to the motor 91.

Note that the relative position of the pressing portion 81 with respect to the weather strip W corresponds to the amount of rotation of the motor 91.

In the above, the moving device 83 uses a motor 91, but in addition, a hydraulic circuit, a cam and a cam follower,
A moving device can be constructed using a crank mechanism or the like.

Furthermore, as shown in FIG. 7, the cam 97 alone can constitute the driving means. In this case, from the control means 70,
A trigger drive control signal is output, and based on this signal, a drive motor (not shown) for the cam 97 drives the cam 97 one revolution.

By adding such a device 40 to a production line for weatherstrips that do not have a deformable part, it is possible to make the production line the same as the line according to the present invention (= the production line for weatherstrips that have a deformable part). can.

Hereinafter, the manner of use of the device 40 according to the embodiment will be explained.

The set movement amount of the weather strip W and the set rotation amount of the motor 91 are set in the control means 70 in advance. This set rotation amount corresponds to the position of the pressing member 81, so
The relationship between the set movement amount and the set rotation amount is as shown in the chart of the CRT 71 of the control means 70 in FIG. In this chart, the horizontal axis is weather strip W
The vertical axis shows the set rotation amount of the motor 91, and the vertical axis shows the set rotation amount of the motor 91, respectively. SNE on the horizontal axis indicates the unit length of the product weatherstrip W, and 0 on the vertical axis indicates that the rotation amount of the motor 91 is O (that is, the motor 91 is stopped and the pressing part 81 is rotated from the weatherstrip W). (state of isolation)
It shows.

Then, the extrusion work of the weather strip W is started. When the extrusion condition becomes stable, this shape device 40 is operated. This state corresponds to S on the horizontal axis of the chart.

Note that at this time, no drive control signal is output from the control means 70, and therefore the motor 91 is not rotating. Thereafter, as the weatherstrip W is pushed out, the amount of movement thereof is input from the rotary encoder 53 to the control means 70 as a movement amount signal. Since this movement amount signal is input in the form of pulses, the CPU of the control means 7o integrates the pulses, thereby obtaining the current movement amount of the weather strip W. In terms of the chart, from S to the left side It will be moved.

When the current movement amount of the weatherstrip W reaches Pl of the chart (set movement amount), a drive control signal is output from the control means 7o, and the motor 41 rotates in the direction of bringing the pressing part 81 closer to the weatherstrip W. start. This amount of rotation is input to the control means 70 via the rotary encoder 92 as a rotation amount signal. Then, the control means 70 outputs a control drive signal to the motor 41 so that the amount of rotation of the motor 91 follows the chart.

In addition, in the chart, the pressing part 81 presses the hollow seal part 3 of the weather strip W between L, so that
The hollow seal portion 3 between them will be plastically deformed.

Also, the current moving distance of the weather strip W is P on the chart.
2, the control means 70 outputs a drive control signal to reverse the motor 91. Then, at P3, the rotation of the motor 91 is stopped.

Thereafter, when the current moving amount of the weatherstrip W reaches a maximum, one cycle ends. This E matches S in the next cycle.

In addition, in the shaped device 40 of the above embodiment, when two or more deformed portions 10 are formed in the weatherstrip W per unit length, the weatherstrip should be shaped so that two or more concave portions are drawn on the chart. Setting S movement of W and motor 91
The setting amount of rotation is determined.

<Effects of the Invention> As explained above, this invention is the ultimate weather strip! A moving amount detecting means for detecting the amount a and outputting a moving amount signal, and a current fJ of the weather strip obtained based on the moving amount signal. A control means for outputting a drive control signal by comparing the IJ amount with a set movement amount of the weatherstrip inputted in advance; A weatherstrip device characterized in that the weatherstrip is provided with a moving means for separating the strip from the strip, and is extruded to a state where it is hardly stretchable or has a foreseeable rate of stretch and is kept on the move. This method of manufacturing a weatherstrip is characterized in that a pressing force is applied from the outside to an unvulcanized weatherstrip to partially plastically deform the weatherstrip, and then the weatherstrip is vulcanized.

This eliminates the need for any deformation of the orifice of the extrusion head when forming deformed portions in the unvulcanized weatherstrip. In other words, since the peripheral wall of the orifice is no longer divided, the weatherstrip extruded from the orifice will not have any cracks. Furthermore, since the shape of the orifice is constant, no extrusion streaks are formed.

The head with such a configuration has a simpler structure than the conventional head. In other words, the movable body and its driving device, which were provided in the conventional head, are no longer required, and the driving device for applying the pressing force only needs to have a smaller output than that of the conventional example. The equipment cost of the various types of equipment used will be reduced.

[Brief explanation of the drawing]

FIG. 1 is a process diagram of a manufacturing method according to an embodiment, FIG. 2 is a perspective view showing a device 40 of various shapes according to an example, and FIG. 40a is a perspective view, FIG. 4 is a plan view showing the moving means 80, and FIGS. 5.6.7 are other embodiments of the moving means 80a. 80b and 80c; FIG. 8 is a cross-sectional view of the weatherstrip W showing the portion where the deformed portion is to be formed; FIG. 9 is a plan view of the weatherstrip W including the deformed portion 10; 11 is a front view showing a corner part 13 of the window frame 11; FIG. 12 is a perspective view showing the head 20 used in the conventional weather strip manufacturing method. It is a diagram. DESCRIPTION OF SYMBOLS 10... Deformation part, 40... What shape device, 50... Movement amount detection means, 70... Control means, 80... Linear means, 81... Pressing part, W... Unvulcanized weather strip, W...
Weatherstripping after vulcanization. Figure 1 Figure 3 1111 Figure

Claims (1)

[Scope of Claims] 1. A method for manufacturing a weather strip having a deformed portion, wherein the unvulcanized state is extruded to a state where it is hardly stretchable or has a predictable stretch rate and is being moved as it is. Method 2 for manufacturing a weatherstrip, characterized in that a pressing force is applied from the outside to the weatherstrip to partially plastically deform the weatherstrip, and then the weatherstrip is vulcanized. A device that partially plastically deforms an unvulcanized weatherstrip that has been extruded to a state with a predictable expansion/contraction rate and is moving as it is, the device detecting the amount of movement of the weatherstrip and determining the movement. a movement amount detection means for outputting an amount signal; and a movement amount detection means for outputting a drive control signal by comparing the current movement amount of the weatherstrip obtained based on the movement amount signal with a preset movement amount of the weatherstrip inputted in advance. and shaping means for pressing a pressing portion against the weather strip or separating the pressing portion from the weather strip based on the drive control signal. Strip shaping device.