JP2012139794A - Device and method for cutting rubber-like elastic body coated long article with core material incorporated therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for cutting a rubber-like elastic body coated long article with a core material incorporated therein, which has excellent cost effectiveness and productivity, and by which a long article is accurately cut to a specific length to form products, the long article being a rubber-like elastic body embedded with a mandrel which is formed by connecting a large number of cores with specific intervals with connecting parts installed between the cores, and to provide a cutting method for cutting the rubber-like elastic body coated long article with the core material incorporated therein.SOLUTION: The long article 10, which is a rubber-like elastic body embedded with the mandrel which is formed by connecting a large number of cores with specific intervals with connecting parts installed between the cores, is cut to a specific length to form products 20. The cutting device 1 at least includes: a first conveying device 3 for conveying the long article 10; a sensor 2 for determining the length of the products 20 by counting the number of intervals between the cores 13 of the long article 10; and a cutter 4 which cuts the long article 10 between the cores 13 to make products 20 with a required length.

Description

  In the present invention, a long object formed by embedding a core metal in which a large number of cores are connected at equal intervals by connecting portions provided between the cores in a rubber-like elastic body is cut into a certain length to obtain a product ( The present invention relates to a cutting device and a cutting method, such as a trim or weather strip for an automobile.

  For example, a weather strip for an automobile is made of a rubber-like elastic body (referred to as an elastic body made of rubber or thermoplastic elastomer) and has a U-shaped cross section embedded in a metal core to increase rigidity and form a body panel or the like. Many of these are used so that they can be firmly assembled to the flange portion. The core metal is generally a core (such as a fishbone type) in which a large number of cores are connected by a connecting portion provided between the cores at regular intervals.

  A weather strip in which such a metal core is embedded is formed by cutting a work piece extruded into a long shape into a predetermined size. Moreover, this cutting | disconnection is performed as follows (refer patent document 1), for example.

  That is, first, in order to make a long rubber strip covered with a core-like rubber-like elastic body into a weather strip having a predetermined length, it is conveyed by a conveyor and stopped when its tip is detected by a dimension detection sensor. In this state, it sets so that a cutting location may be located just under a 1st cutter.

  Next, the proximity sensor senses whether the core or between the cores is located at the cutting location. If the core is located, the long object (or the first cutter) is finely moved to Position between the cores (connecting part) directly under the cutter.

  Subsequently, the first cutter is moved down between the cores to cut the connecting portion, thereby dividing the cored bar. Finally, the long object is grasped with a clamp and pulled in the front-rear direction to widen the cutting portion. In this state, the second cutter is inserted into the cutting portion to cut the entire workpiece. Thus, a weather strip (product) having a predetermined length is obtained.

JP 2010-006243 A

  However, the above-described conventional cutting method has a problem that the apparatus is large-scale and is not economical because it requires a proximity sensor in addition to the dimension detection sensor. Moreover, after positioning the cut part of the rubber-like elastic body-covered long material containing the core material under the first cutter, it is necessary to move the long material in order to search between the cores.

  Also, when cutting between the cores (connecting part) with the first cutter, if you want to cut at the intermediate point as much as possible (to avoid the cutter coming into contact with the core at the time of cutting, etc.) It is necessary to finely move the rubber-like elastic body-covered long article containing the core material. Therefore, there is a problem that the cutting work takes a lot of time and productivity is poor.

  In addition, there is a problem of moldability such that a dimensional error occurs in the length of a weather strip (product) formed by cutting a rubber-like elastic body-covered long material containing a core material. This is because the length of the weather strip is obtained based on the length of the long object. Since the long object is a rubber-like elastic body in which a metal core is embedded, deformation such as undulation is likely to occur due to the influence of the rubber-like elastic body. Therefore, it is because it is difficult to obtain an accurate length from a long object with deformation.

  The present invention was devised in view of such problems, and a long object in which a core metal formed by connecting a large number of cores at a predetermined interval by a connecting portion provided between the cores is embedded in a rubber-like elastic body can be accurately obtained. Another object of the present invention is to provide an apparatus and a method excellent in economic efficiency and productivity that are cut into a certain length to obtain a product (such as a trim for automobiles or a weather strip).

Definition of terms: Rubber-like elastic body means an elastic body made of rubber or thermoplastic elastomer.
This will be described with reference to FIGS. The core-containing rubber-like elastic body-covered long material cutting device 1 according to claim 1 is formed by connecting a large number of cores 12 at regular intervals by connecting portions 14 provided between the cores 13. A long object 10 embedded in a rubber-like elastic body 15 is cut into a predetermined length to obtain a product 20.

  The cutting device 1 includes at least a first transport device 3 that transports the long object 10, a sensor 2 that determines the length of the product 20 by counting the number of cores 13 of the long object 10, and The long object 10 is cut between the cores 13 to provide a product 20 having a length determined by the cutter 4.

  In the method for cutting a rubber-like elastic body-covered long article with a core material according to claim 2, the core metal 11 formed by connecting a large number of cores 12 at regular intervals by connecting portions 14 provided between the cores 13 is used. A long object 10 embedded in a rubber-like elastic body 15 is cut into a predetermined length to obtain a product 20.

  In this cutting method, the length of the product 20 is obtained by counting the number of the cores 13 of the long object 10 by the sensor 2, and then the cores 13 are cut to obtain a product 20 having a certain length To do.

  In the cutting device 1 for a long rubber-coated body covered with a core material according to claim 1, a dimension detection sensor that has been conventionally used for obtaining a product 20 having a certain length is not necessary, and one sensor 2 is used. Therefore, the apparatus 1 can be simplified and economical.

  Further, when the cutter 4 cuts the inter-core 13, the length is obtained with reference to the inter-core 13, so that the cutter 4 can always be positioned directly above the inter-core 13. Therefore, since it is not necessary to finely move the cutter 4 and the long object 10 as in the prior art, the cutting operation can be shortened, and thus the productivity can be increased.

  Further, since the length of the product 20 is obtained by counting the number of cores 13, no error occurs in the length of the product 20. This is because the core metal 10 has high rigidity and is difficult to be deformed.

  In the method for cutting a rubber-like elastic body-covered long material with a core material according to claim 2, the length of the product 20 is obtained by counting the number of the cores 13 by the sensor 2, and the cores 13 are cut. The product 20 having a uniform length can be accurately manufactured.

It is a lineblock diagram showing an embodiment of a cutting device concerning the present invention. It is a perspective view which shows the product (trim) cut | disconnected by the cutting device which concerns on embodiment of this invention. It is a top view which shows the metal core embed | buried under the product shown in FIG. 2 (state before bending). It is a perspective view which shows the other product (weather strip) cut | disconnected by the cutting device which concerns on this invention.

  Embodiments of a cutting device 1 and a cutting method for a core-like rubber-like elastic body-covered long material according to the present invention are shown in FIGS. This cutting device 1 is configured to connect a long object 10 in which a core metal 11 formed by connecting a large number of cores 12 at a predetermined interval by connecting portions 14 provided between cores 13 is embedded in a rubber-like elastic body 15. The product is cut into a product (automobile trim) 20 and includes a first transport device 3, a sensor 2, a cutter 4, and a second transport device 5.

  The 1st conveying apparatus 3 is comprised by the upper side belt conveyor 3a and the lower side belt conveyor 3b which clamp and convey the elongate object 10 from upper and lower sides. In addition, this 1st conveying apparatus 3 is not limited to such a structure, For example, it can comprise only with the lower side belt conveyor 3b, and can also be comprised with a pair of upper and lower rollers. Moreover, when the 2nd conveying apparatus 5 mentioned later clamps the elongate object 10, a 1st conveying apparatus can also be abbreviate | omitted.

  The sensor 2 is an eddy current type provided in the vicinity of the downstream side of the first transport device 3 and has a function of detecting the inter-core 13 of the long object 10. The sensor 2 includes a counter 2a that counts the number of detected cores 13 and stops the first transport device 3 when the number reaches a predetermined number.

  The cutter 4 is provided so as to be movable up and down immediately above the long object 10, and is set to cut the long object 10 at an intermediate point between the cores 13.

  The 2nd conveying apparatus 5 is a belt conveyor type, is arrange | positioned in the downstream of the cutter 4, and conveys the cut | disconnected product 10 further downstream. This second conveying device can be omitted if the cut product is taken manually, and other forms are also conceivable.

  The cutting device 1 for a rubber-like elastic body-covered long article with a core according to the present embodiment operates as follows. First, the long object 10 is moved forward by the first transport device 3. At this time, the inter-core 13 of the core metal 11 embedded in the long object 10 that is moved by the sensor 2 is detected, and the number is counted by the counter 2a. Subsequently, when the number reaches a predetermined number, the first transport device 3 is stopped by a signal from the counter 2a.

  Then, the cutter 4 is moved downward to an intermediate point between the cores 13 detected as having reached the predetermined number, and the long object 10 is cut. As a result, a product (trim) 20 having a certain size is obtained. Note that the inter-core 13 detected as having reached the predetermined number and the inter-core 13 to be cut may not be the same, and may be set to be different.

  Since the cutting device 1 according to the present embodiment can determine the dimensions of the product 20 with one sensor 2, the device can be simplified and is economical. In addition, the inter-core 13 is detected, and the intermediate point of the inter-core 13 (moved by half the distance between the cores than the last core specified after counting the number of cores or the number of cores required for the product) Since the cutter 4 is moved down to the position) and cut, the cutter 4 can be accurately moved between the cores 13. Therefore, for example, fine adjustment is not necessary when cutting the core-to-core 13, cutting time can be shortened, and productivity can be improved.

  Furthermore, since the length of the product 20 is obtained by counting the number of the cores 13 between the cores 13 or the cores 12, no dimensional error occurs. Since the core 11 is made of a hard metal such as stainless steel, the dimensional accuracy is extremely high. The inventors have confirmed that, for example, the metal core 11 of a fishbone type (one connecting portion between cores) having a length of 1 meter has a molding error of less than 0.1 mm. Therefore, the error can be eliminated by obtaining the length of the product 20 based on the number of the cores 13 between the cores 11.

  For example, in the case of the long object 10 in which the fishbone type metal core 11 (core 3 mm, core distance 2 mm) having the dimensions shown in FIG. 3 is embedded, the length of the product 20 obtained from the long object 10 is expressed by the following formula (1): It can be unified to 997 mm or 1002 mm as shown in equation (2). Formula (1) is a case where the number of cores is 199, and Formula (2) is a case where the number is 200.

(1) 5 mm (for 1 pitch) × 199 pieces + 1 mm (center between cores) × 2 (both ends) = 997 mm
(2) 5 mm (for one pitch) × 200 pieces + 1 mm (center between cores) × 2 (both ends) = 1002 mm

  In addition, although it is desirable to use the cutting device 1 according to this embodiment before cutting a large number of connecting portions 14 existing between the cores 13 by other general means such as a bending process, the cutting device 1 is used after cutting. You can also. This is because there is no significant variation in the distance between the cores 13 even after cutting.

  Further, the wider the space 13 between the cores 11 of the metal core 11 cut by the cutting device 1, the more accurately it is detected by the sensor 2. However, the inventors have an accurate length if the space between the cores 13 is 1.1 mm or more. It was confirmed that it can be cut. Incidentally, in the case of the cored bar 11 (2 mm between cores) shown in FIG. 3, it was possible to detect between the cores very accurately, and thus it was possible to always cut to an accurate length. However, since the accuracy of counting between cores or the number of cores depends on the function of the sensor, if a sensor having a more accurate function appears, even if the distance between cores is very small.

  The product 10 formed by being cut by the cutting device 1 according to the present invention is not limited to the trim shown in FIG. 2, and for example, as shown in FIG. 4, a weather strip having a hollow seal portion 20a. including. Moreover, the cored bar 11 embedded in the product 10 includes types other than the fishbone type shown in FIG. 3 (for example, two or more connecting portions between cores as in the cross beam type).

DESCRIPTION OF SYMBOLS 1 Cutting apparatus 2 Sensor 2a Counter 3 1st conveying apparatus 3a Upper belt conveyor 3b Lower belt conveyor 4 Cutter 5 Second conveying apparatus 10 Long thing 11 Core metal 12 Core 13 Between cores 14 Connection part 15 Rubber-like elastic body 20 Product 20a Hollow seal part

Claims (2)

  A long object (11) in which a core metal (11) formed by connecting a number of cores (12) at regular intervals by connecting portions (14) provided between cores (13) is embedded in a rubber-like elastic body (15) ( 10) is a device that cuts a fixed length into a product (20), the first transport device (3) for transporting the long object, and the number of cores between the cores of the long object A sensor (2) that determines the length of the product by counting, and a cutter (4) that cuts the long object between cores to obtain a product having a determined length. Cutting device for rubber-like elastic body-covered long material containing core material.   A long object (11) in which a core metal (11) formed by connecting a number of cores (12) at regular intervals by connecting portions (14) provided between cores (13) is embedded in a rubber-like elastic body (15) ( 10) is a method of cutting a fixed length into a product (20), wherein the length of the product is obtained by counting between the cores of the long object or the number of cores by a sensor (2). After that, the core-containing rubber-like elastic coated long material is cut by cutting between the cores to make a product of a certain length.

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