JPH0528981B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a weather strip manufacturing apparatus having a deformable portion. The weather strip manufactured according to the present invention is suitable as a weather strip for vehicle window frames, luggage, sunroofs, etc., and has a hollow seal portion 2 (see Fig. 8), a mounting lip portion 4, and a seal lip portion 6.
A deformed portion is formed to fit into a corner portion having a small radius of curvature.

<Prior art> Conventionally, a weather strip W having a deformable portion 10
As shown in FIGS. 9 and 10, there is one shown in FIG. This weather strip W is composed of a mounting portion 1 and a hollow seal portion 3. A sheet metal insert 5 is embedded in the mounting portion 1, and three mounting lips 9 for securely gripping the body flange 7 are formed. Then, a hollow seal portion 3 is located at a position corresponding to the corner portion 13 of the window frame 11 (see FIG. 11).
As shown in FIG. 9, a is deformed in a direction protruding from the mounting portion 1 (upward in the figure). This results in
When the weather strip W is attached to the window frame 11, the hollow seal portion 3 has substantially the same cross-sectional shape at the corner portion 3a and the straight portion 3b.

In the weather strip without the deformable portion 10, the hollow seal portion 3a at the corner portion 13 of the window frame 11 collapses inward as shown by the imaginary two-dot chain line in FIG. Therefore, the hollow seal part 3
The cross-sectional shape of the corner part 3a and the straight part 3
b. This may cause variations in the sealing performance of the weather strip W.

Weather strip W having the deformed portion 10
was formed in the following manner using the following manufacturing apparatus (head 20).

First, using the head 20 (see Fig. 12), which can change the shape of the orifice 21, attach the unvulcanized weather strip w (in this specification, the unvulcanized weather strip is denoted by "w" and the vulcanized weather strip w). Weatherstrips are extruded (marked with a "W"). 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. Note that two ducts 23 and 2 are provided in the head 20 so that the mounting portion 1 and the hollow seal portion 3 are made of different materials.
5 are arranged. Moreover, the insert 5 is introduced into the head 20 from the same direction as the duct 23 for the attachment part 1.

Then, the extruded unvulcanized weather strip w is passed through a vulcanization tank and cut into a predetermined length (so that the deformed portion 10 corresponds to the corner portion 13 of the window frame 11) to form the product weather strip. Let it be W.

<Problem to be solved by the invention> However, in the above manufacturing apparatus, the movable main body 2
In order to change the shape of the orifice 21 by moving the orifice 2, the peripheral wall of the orifice 21 is divided into a movable body 22 and a fixed body 24. Therefore, there is a risk that extrusion lines may occur due to the movement of the movable main body 22 during extrusion, or that burrs may be formed due to poor fitting.

In order to prevent this, in the past, the movable main body 22
The machining accuracy (including adjustment of the fit) between the fixed body 24 and the fixing body 24 was made as high as possible. However, it was not possible to completely prevent the occurrence of extrusion streaks and burrs. In addition, in conventional heads, a drive device (motor, gear, etc.) for moving the movable body 22 is used.
In the past, it was necessary to provide sufficient driving force to move the movable body 22 due to the pressure of the material applied to the movable body 22 and the resistance of the mating parts, which was a factor that increased the cost of the device.

In other words, conventional manufacturing equipment not only cannot completely prevent the occurrence of extrusion lines and burrs, but also increases equipment costs.

Furthermore, since the deformed portion 10 is provided to prevent the weather strip W from interfering with other members, positioning the deformed portion 10 is important. If there is an error in the position of the deformed portion 10, there is a risk that the interference prevention effect may not be sufficiently achieved or that the performance (waterproofing, etc.) of the weather strip W itself may be degraded.

This error in the deformed portion 10 was caused by a misalignment in the position at which the long extruded weather strip w was cut into unit lengths.

However, conventionally, no measures have been taken to prevent the above-mentioned deviation of the cutting position.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a weather strip manufacturing device that can prevent extrusion lines and burrs from appearing on weather strips and can reliably cut weather strips into unit lengths using a device that has a simple configuration. do.

<Means for Solving the Problems> As a result of repeated studies to achieve the above object, the inventors came up with the following invention.

That is, the weather strip is extruded to a state where it is hardly stretchable or has a predictable stretch rate, and partially plastically deforms the unvulcanized weather strip while it is still moving, and also marks the intended cutting position of the weather strip. The manufacturing apparatus includes a movement amount detection means for detecting the movement amount of the weatherstrip and outputting a movement amount signal to the first control means and the second control means, and a current movement amount of the weatherstrip obtained based on the movement amount signal. a first control means that compares the amount of movement of the weather strip with a previously input setting movement amount of the weather strip, outputs a drive control signal to the shaping means based on the comparison result, and outputs an operation signal to the second control means; When an actuation signal is input from the control means, a second control means calculates the current moving speed of the weather strip from the movement amount signal and outputs a drive signal to the marking means based on the calculation result; shaping means for pressing the part against the weather strip or separating the pressing part from the weather strip;
This weatherstrip manufacturing apparatus is characterized in that it is equipped with a marking means for marking the intended cutting position of the weatherstrip while moving the marker in a direction parallel to and at the same speed as the movement of the weatherstrip based on a drive signal.

<Examples> The present invention will be described in more detail below 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 manufacturing apparatus 40 of the embodiment, as shown in FIG.
(A) Movement amount detection means 50, (B) First control means 7
0, (c) second control means 75, (d) shaping means 80
and (e) marking means 100.

(A) The movement amount detection means 50 is composed of a roller 51 and a rotary encoder 53, as shown in FIG.
It is arranged near the extrusion port of the head 30. The roller 51 is placed in the frame 5 with its peripheral surface in contact with the lower surface of the unvulcanized weather strip w.
It is pivoted on 5. The shaft 57 is connected to the rotation shaft of the 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 linear movement amount of the weather strip w is converted into the rotation amount of the rotary encoder 53, and a movement amount signal (pulse signal) corresponding to the rotation amount is output.

In the example shown in FIG. 2, the roller 51 is brought into contact with the lower surface of the weather strip w, but it can of course 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 grain on the weather strip w, a rotary encoder 53 can be connected to the pattern forming roller 61. Thereby, slippage between the weather strip w and the patterned forming roller 61 can be reliably prevented. In the figure, reference numeral 63 is a presser roller, and reference numeral 65 is a roller unit.

Moreover, the arrangement position of the roller 51 is not particularly limited, and the roller 51 may be brought into contact with the insert 29, for example.

Above, we have explained the method of converting the amount of movement of the weather strip w into the amount of rotation and then detecting this.
In order to detect the amount of movement of the weather strip w, other known methods such as an optical method or an air method may be used.

(a) The movement amount signal output from the rotary encoder 53 described above is input to the first control means 70. This first control means 70 has the following effects:
has a CPU programmed to do so.

In addition to comparing the set movement amount of the weather strip that has been input in advance with the current movement amount of the weather strip obtained by integrating the movement amount signal, a rotation amount signal (pulse signal; The current amount of rotation of the motor 91 (corresponding to the current position of the pressing part 81) obtained by integrating the amount of rotation (input) is compared with the set amount of rotation of the motor 91 that has been input in advance, and based on those results, Outputs drive control signals.

The current amount of movement of the weather strip w is compared with the set amount of movement, and an activation signal is output to the second control means 75 based on the result.

The shaping means 80 is actuated by the drive control signal, and a pressing force is applied to a predetermined position of the unvulcanized weather strip w from a direction substantially perpendicular to its moving direction.

The set movement amount of the weather strip and the set rotation amount of the motor are determined by an external input device.
It shall be possible to change it as appropriate.

(c) The movement amount signal output from the rotary encoder 53 described above is also input to the second control means 75. This second control means 75 includes a CPU programmed to calculate the current moving speed of the weather strip w from the number of pulses of the movement amount signal input per unit time and output a drive signal based on the calculation result. It becomes. Of course, this CPU can also be used as the first control means 70.

This drive signal causes the marking means 100 to
is activated, and a mark is drawn on the weather strip w while moving the marker in the same direction and at the same speed as the weather strip w.

(d) The drive control signal output from the first control means 70 described above is input to the shaping means 80. This shaping means 80 includes a pressing section 81 and a moving device 83 thereof.

A driven roller was used as the pressing part 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 weather strip w. In order to further ensure this, it is preferable that the roller 99 be as shown in FIG. This roller 99
has a circumferential surface that is contoured to 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 rotate easily following the hollow seal part 3. Then,
Almost no scratches or the like will occur due to contact with the hollow seal portion 3.

Of course, this roller can be divided into two or four or more parts, and it is not necessary to divide it into parts.

On the other hand, depending on the material of the weather strip w or the formation position of the deformed portion, a round-headed rod 85 shown in FIG. 6 or the like may be used instead of the driven roller. 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,
It is composed of a screw 89, a motor 91, and a rotary encoder 92. In addition, the code 93 in the figure
Reference numeral 95 indicates a base, and reference numeral 95 indicates 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 is
will move in the axial direction of the screw 89. A servo 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.

When the drive control signal from the first control means 70 is input to the motor 91, the motor 91 starts to rotate, and a rotation amount signal of the motor 91 is fed back to the first control means 70 from the rotary encoder 92. Based on this rotation amount signal, the first control means 70 compares the current rotation amount of the motor 91 with a set rotation amount inputted in advance, and sends a drive control signal to rotate the motor 91 in accordance with 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.

Although the moving device 83 using the motor 91 has been shown above, the moving device can also be constructed using a hydraulic circuit, a cam and a cam follower, a crank mechanism, and the like.

Furthermore, as shown in FIG. 7, the shaping means 80c can be configured by only the cam 97. In this case, the first control means 70 outputs a trigger drive control signal, and based on this signal, a drive motor (not shown) drives the cam 97 to rotate once.

(e) The drive signal output from the second control means 75 described above is input to the marking means 100.
This marking means 100 includes a marker 101
and its moving device 102.

The marker 101 is not particularly limited as long as it can mark the surface of the weather strip w, but in the embodiment, a paint marker was used.

Then, the marker 101 is connected to the moving device 102.
is at the reference point, the pressing part 8 of the shaping means 80
1, they are arranged at a distance corresponding to the interval on the horizontal axis S-P1 in the CRT display chart of FIG.

The moving device 102 for the marker 101 includes a vertical moving section 103 that moves the marker 101 close to and away from the weather strip w, and a horizontal moving section 103 that moves the vertical moving section 103 along with the marker 101 in a direction parallel to the moving direction of the weather strip w. It consists of a moving section 109. And the vertical movement section 103
The reference point of the moving device 102 is when the marker 101 is separated from the weather strip w and the lateral moving section 109 is at a distance corresponding to the interval S-P1 in the chart described above.

The vertical movement section 103 includes a first support member 105 that supports the marker 101, and a first support member 105 that supports the marker 101.
Air cylinder 1 with 05 fixed to the tip of the rod
Consists of 07. And air cylinder 1
By inserting and removing the rod 07, the marker 101 is moved close to and away from the weather strip w.

The lateral movement section 109 includes a second support member 111 that supports the air cylinder 107, and a screw 113 (a rod-shaped screw disposed in a direction parallel to the moving direction of the weather strip w) that is a pair of screws on the second support member 111. ), and a rotation motor 115 of a screw 113. Note that the reference numeral 117 in the figure is a base, and the reference numeral 119 is a guide. Then, drive the motor 115 to
By rotating 13, the second support member 11
1 will move in a direction parallel to the movement of the weather strip w. Furthermore, if the direction of rotation of the screw 113 is reversed, the second support member 111 will move in the opposite direction to the direction of movement of the weather strip w. As the second support member moves, the marker 101 also moves.

The arrangement of each means described above is not limited to that shown in FIG. 2. For example, marking means 10
0 to the position closest to the head 30, or the movement amount detection means 50 is placed in the position closest to the marking means 100.
It can be placed at the rear of the

In particular, with respect to the pressing portion 81, the direction in which the pressing force is applied is not particularly limited, and the pressing force can be applied from an inclined direction with respect to the moving direction of the weather strip w, from a direction coaxial with the moving axis, or the like. Furthermore, by sandwiching it,
It is also possible to modify the hollow seal portion 3 and the like.

Also, the timing of applying the pressing force (=positioning of the shaping means 80). There is no particular limitation as long as it is before vulcanization progresses and hardens. This can also be done while the weather strip is softened during the vulcanization process to facilitate deformation. If a large deformation is required, the timing of pressing can be dispersed to reduce the pressing force per location.

By adding this manufacturing apparatus 40 to a manufacturing line for weather strips without deformable parts, the manufacturing line can be made the same as the line according to the present invention (= the manufacturing line for weather strips having deformable parts).

The manner in which the manufacturing apparatus 40 of the embodiment is used will be explained below.

The set movement amount of the weather strip w and the set rotation amount of the motor 91 are input into the first control means 70 in advance. Since this set amount of rotation corresponds to the position of the pressing member 81, the relationship between the set amount of movement and the set amount of rotation is the same as that of the first control means 70 in FIG.
will be displayed on the CRT chart. In this chart, the horizontal axis is the weather strip.
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. S to E on the horizontal axis indicate the unit length of the product weather strip W. Further, 0 on the vertical axis means that the rotation amount of the motor 91 is 0 (i.e.,
The motor 91 is stopped and the pressing portion 81 is separated from the weather strip w.

Then, the extrusion work of the weather strip w is started. When the extrusion condition becomes stable, the shaping device 40 is activated. This state corresponds to S on the horizontal axis of the chart.

At this time, an actuation signal is output from the first control means 70 to the second control means 75. Then, the second control means calculates the current moving speed of the weather strip w based on the movement amount signal inputted from the movement amount detection means, and based on the result, the marking means 10
Outputs the drive signal to 0. Based on this drive signal, the marking means 100 moves the lateral moving part 109, which is at the reference point, at the same speed as the weather strip w for a predetermined period of time (1 to 2 seconds; or 20 to 30 cm), and then further moves it. While maintaining the position, the vertical moving section 103 is operated so that the marker 101 comes into contact with the weather strip w. As a result, dot-like marks are drawn on the weather strip w. This dotted mark becomes the intended cutting position of the weather strip w. After drawing the mark, the moving device 102 returns to the reference point.

On the other hand, at this time, the first control means 70 does not output a drive control signal, and therefore the motor 91 is not rotating. Thereafter, as the weather strip w is pushed out, the amount of movement thereof is sent to the first control means 7 as a movement amount signal from the rotary encoder 53.
Input to 0. Since this movement amount signal is input in the form of pulses, the CPU of the first control means 70 integrates the pulses. As a result, the current amount of movement of the weather strip w can be obtained. In chart terms, this means moving from S to the left.

When the current travel amount of the weather strip w reaches the chart (set travel amount) P1, the first control means 7
A drive control signal is output from 0, and the motor 41
The support member 87 of the pressing part 81 is weatherstripped w.
It begins to rotate in the direction of bringing it closer to. This amount of rotation is inputted to the first control means 70 via the rotary encoder 92 as a rotation amount signal. Then, the first control means 70 sends a control drive signal to the motor 41 so that the amount of rotation of the motor 91 follows the chart.
Output to.

In addition, in the chart, the pressing part 81 presses the hollow seal part 3 of the weather strip w between L, and the hollow seal part 3 between them is plastically deformed. Also, weather strip lol
When the current movement amount reaches P2 of the chart, the first
A drive control signal to reverse the motor 91 is output from the control means 70. And in P3,
Rotation of motor 91 is stopped.

After that, the current travel distance of the weather strip w is E.
When this is reached, one cycle ends. This E matches S in the next cycle.

Further, at this E, an actuation signal is input from the first control means 70 to the second control means 75. This causes the second control means 75 to control the marking means 1.
A drive signal is output to 00, and marking work is performed as described above.

As a result of the above, a weather strip w of unit length has been extruded. Then vulcanize this,
The weather strip is cut at the dotted mark drawn thereon to obtain a product weather strip W.

In the above embodiment, when forming two or more deformed portions 10 in the weather strip w per unit length, the set movement amount of the weather strip w and the motor should be adjusted so that two or more concave portions are drawn on the chart. The set rotation amount of 91 is determined.

<Effects of the Invention> As explained above, the weatherstrip manufacturing apparatus of the present invention can extrude weatherstrips in an unvulcanized state that are hardly stretchable or have a predictable expansion/contraction rate and are still moving. A weatherstrip manufacturing device that partially plastically deforms the weatherstrip and marks the intended cutting position of the weatherstrip, detects the amount of movement of the weatherstrip, and outputs a movement amount signal to a first control means and a second control means. Movement amount detection means;
The current travel amount of the weather strip obtained based on the travel amount signal is compared with the set travel amount of the weather strip that has been input in advance, and based on the comparison result, a drive control signal is output to the shaping means, and the drive control signal is actuated to the second control means. a first control means for outputting a signal; and a first control means for calculating the current moving speed of the weather strip from the movement amount signal when the actuation signal is input from the first control means, and outputting a drive signal to the marking means based on the calculation result. 2 a control means and a drive control signal to press the pressing part against the weather strip;
or a shaping means for separating the pressing part from the weatherstrip, and a marking means for marking the intended cutting position of the weatherstrip while moving the marker in a direction parallel to and at the same speed as the movement of the weatherstrip based on a drive signal. The structure is as follows.

This eliminates the need for any deformation of the orifice of the extrusion head when forming deformations in the unvulcanized weatherstrip. In other words, since the peripheral wall of the orifice is no longer divided, burrs are no longer formed on the weather strip extruded from the orifice. Furthermore, since the shape of the orifice is constant, no extrusion streaks are formed.

The head with this configuration has a simpler structure than the conventional one. That is, the movable body and its driving device, which were provided in the conventional head, are no longer necessary, and the driving device for applying the pressing force needs to have a smaller output than that of the conventional example.
Therefore, the equipment cost of the weather strip manufacturing apparatus is reduced.

Further, a mark is drawn at the intended cutting position of the weather strip which has been pushed out and is still moving, while moving the marker in a direction parallel to and at the same speed as the movement of the weather strip. As a result, the marks drawn on the weather strip are in the form of dots, so that the cutting position can be easily and reliably determined during the cutting operation.

It is preferable to move the marker in a direction parallel to and at the same speed as the movement of the weatherstrip, because if the marker is fixed, the marks drawn on the weatherstrip will be linear and there will be a high probability of errors in the planned cutting position. do not have.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a manufacturing apparatus 40 according to an embodiment,
2 is a perspective view showing the manufacturing device 40, FIG. 3 is a perspective view showing a shaping device 40a equipped with a movement amount detection means different from that in FIG. 2, and FIG. 4 is a perspective view showing the shaping device 80.
FIGS. 5, 6, and 7 are plan views showing shaping means 80a, 80b, and 80c in other embodiments.
The figure 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 provided with the deformed portion 10, and FIG. 10 is a cross-section along the line X-X in FIG. 9. 11 is a front view showing the corner portion 13 of the window frame 11, and FIG.
The figure is a perspective view showing a conventional weather strip manufacturing apparatus (head 20). 10... Deformation section, 40... Shaping device, 50...
Movement amount detection means, 70... First control means, 75...
... second control means, 80 ... shaping means, 81 ... pressing section, 100 ... marking means, w ... unvulcanized weather strip, W ... weather strip after vulcanization.

[Claims]

1. A weatherstrip manufacturing device that partially cuts an unvulcanized weatherstrip that has been extruded to a state where it is almost non-stretchable or has a predictable expansion/contraction rate and is still moving, and the amount of movement of said weatherstrip. a movement amount detection means for detecting a movement amount signal and outputting a movement amount signal to a first control means described later; and comparing the current movement amount of the weather strip obtained based on the movement amount signal with a preset movement amount of the weather strip inputted in advance. and a first control means for outputting a drive control signal to the cutting means to be described later based on the comparison result; a cutting blade and a receiving roller are arranged so as to sandwich the weather strip; A weather strip manufacturing apparatus comprising: a cutting means for bringing the cutting blade and the receiving roller into contact with the weather strip until the weather strip can be cut, or for separating at least the cutting blade from the weather strip.

Claims (1)

A shaping means for separating the weather strip from the weather strip; and a marking means for marking the intended cutting position of the weather strip while moving the marker in a direction parallel to and at the same speed as the movement of the weather strip based on the drive signal. A weather strip manufacturing device characterized by: