JP3425975B2 - Processing method for continuous extrusion - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a continuously extruded product. 2. Description of the Related Art For example, an extruded product such as a molding or a sheet material is continuously extruded from an extruder, and is subjected to predetermined post-processing steps such as fixed-size cutting or partial cutting and pressing by a feed roller. Sent to In this processing step, processing is performed by temporarily stopping a feed roller for transferring the extruded product. On the other hand, since the molded product is continuously extruded from the extruder regardless of the stop of the feed roller, a slack control section is provided between the extrusion step and the post-processing step, and the feed roller is stopped. During this operation, the molded product is kept at the slack control unit. The slack control unit is provided with a known photoelectric sensor and the like and is connected to a speed control unit of a feed roller (not shown) to measure the position of a molded product passing therethrough and adjust the rotation speed of the feed roller. It is supposed to. At the time of normal feeding of the molded product, the rotational speed of the feed roller is adjusted so that no extra tension is applied to the molded product, and a constant slack amount is maintained. However, as described above, when the feed roller stops during processing and the molded product stops at the slack adjusting section, after processing is completed, the feed roller is rotated faster than normal speed to quickly send out the molded product, and the molded product is normally processed. After returning to the slack position, return to the normal rotation speed. However, in the case where the feed speed of the molded article changes as needed, the time required from the reception of the stop signal to the complete stoppage of the molded article is determined by the feed speed V of the molded article.
a and Vb cause a length difference. Accordingly, as shown in FIG. 5, the lengths A and B of the molded products to be delivered differ depending on the feed speed of the molded products before the feed roller stops, and the processing positions of the molded products vary and the lengths are not uniform. There was a problem of becoming. SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems, and the feed speed of a molded article is reduced to a constant speed before the feed roller stops. Thus, it is possible to eliminate the variation in the stop position of the molded product due to the change in the rotation speed of the feed roller as described above, and to provide a method of processing a continuously extruded molded product that can dramatically improve the processing position and accuracy of the product. It is assumed that. According to a first aspect of the present invention, a molded product (51) continuously extruded from an extruder is sent out by a feed roller (15) and cut out at a predetermined position of the molded product.
A cut portion for forming a notch in the front side of the feed roller when the molded product is cut into a predetermined length.
Notch forming cutter (20), fixed-size cutting cutter on rear side
-(21) is provided, and the cutter for fixed-size cutting is provided.
Behind, the notch forming cutter was operated.
Stop sensor (24) and deceleration sensor (2)
5) a first sensor (22) comprising:
If the stop sensor (26) for operating the cutter
And a second sensor (2) including a deceleration sensor (27).
3) provided by the deceleration sensor of the first sensor.
The feed roller speed is reduced to a predetermined speed by
After deceleration to a constant speed, the stop sensor of the first sensor
Therefore, the feed roller is stopped, and the notch
A notch is formed at a predetermined position on the
After forming the notch, rotate the feed roller to feed the molded product.
And then, by the deceleration sensor of the second sensor,
The feed roller speed is reduced to a predetermined speed, and after the speed is reduced to the predetermined speed, a stop sensor of the second sensor
The feed roller is stopped by the
The present invention relates to a method for processing a continuous extruded product, wherein the molded product is cut into a predetermined length by a cutter . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic side view showing an example of a method for processing a continuously extruded product, FIG. 2 is a graph showing the relationship between the feed speed and the feed length of the molded product, and FIG. 3 is continuous extrusion obtained by the processing method of the present invention. FIG. 4 is a perspective view showing an example of a molded product, and FIG. 4 is a schematic side view showing a method of processing the continuous extruded product shown in FIG. The method for processing a continuous extruded product shown in FIG.
The molded product 50 continuously extruded from the extruder 10 is continuously fed to the processing step 14 by the feed roller 15, and is used for accurately performing the predetermined processing such as the above-mentioned fixed-size cutting and partial cutting. is there. In this example,
In the processing step 14, a cutting cutter 16 is provided, and the molded product 50 is cut to a fixed size. In the figure, reference numeral 11 denotes a cooling unit, 12 denotes a take-off machine, and 13 denotes a slack control unit. At a predetermined position behind the cutting cutter 16, a stop sensor 17 is provided.
By detecting the passing of the molded article 50 by the operation of (1), a stop signal is transmitted to the feed roller 15 to stop the molded article 50 at a predetermined feed position. After the feed roller 15 is stopped, the molded product 50 is cut to a fixed size by the cutting cutter 16. In front of the stop sensor 17, a deceleration sensor 18 is provided. This deceleration sensor 18
Is for detecting and operating the molded product before the stop sensor 17 is activated, and for issuing a deceleration signal to the feed roller 15 to reduce the molded product feed speed to a predetermined low speed. The speed of the molded article decelerated by the deceleration sensor 18 is set in advance by a sequencer (not shown). If the speed is too high, it takes time from the completion of deceleration to the stop. If the speed is too low, it takes time from receiving the deceleration signal until reaching the predetermined speed. In this embodiment, the molded article feed speed changes as needed at about 10 m / min in a normal state and about 20 m / min during high-speed take-off, and the set speed of the molded article by the deceleration sensor 18 is 4 m / min. The time until the stop is set to about 1 second. The interval between the stop sensor 17 and the deceleration sensor 18 is determined by the interval between the time when the deceleration signal is issued and the time when the molded article reaches the stop sensor 17 and is detected and the stop signal is transmitted. It is preferable to provide an interval enough to sufficiently reduce the speed to a predetermined speed. Next, a working method will be described. The molded product 50 extruded from the extruder 10 is sent to the processing step 14 by the feed roller 15. At this time, as described above, the feeding speed of the molded article 50 is about 10 to 20 m.
/ Minute at any time. First, when the molded article 50 reaches the deceleration sensor 18, a deceleration signal is issued to the feed roller 15, and the molded article is decelerated to a predetermined low speed. Further, when the molded product 50 passes through the stop sensor 17 disposed behind the molded product 50, a stop signal is issued to the feed roller 15, and
The molded product stops at a predetermined feed position and performs a predetermined cutting process. At this time, since the molded article 50 is sufficiently decelerated to a predetermined low speed by the deceleration signal from the deceleration sensor 18, the molded article 50 is quickly and for a fixed time in response to the stop signal from the stop sensor 17. Stop. On the other hand, while the rotation of the feed roller 15 is stopped and the predetermined processing is being performed, the molded product continuously extruded from the extruder 10 remains in the slack control unit 13. After the cutting of the molded product by the cutting cutter 16 is completed, the feed roller 15 is rotated at a higher rotation speed (about 20 m / min) than at the time of normal molded product feeding, and the molded product retained in the slack control unit 13 is quickly sent out. From normal operation speed. According to this method, even if such a change in the speed of the molded product occurs, the length of the molded product delivered from the feed roller is always constant. That is, as is better understood from FIG. 2, even if the molded article velocities Va and Vb immediately before the operation of the deceleration sensor 18 are variously varied, the operation of the deceleration sensor 18 causes a predetermined low speed Vr in advance. Since the length has been reduced, the length of the molded product sent until the feed roller stops by the stop sensor 17 is always constant. For this reason, there is no variation in the length of the molded product to be sent out, and the accuracy of the cutting length and the processing position becomes extremely good. In order to increase the work efficiency and accuracy, it is preferable to minimize the time Tt from transmission of the deceleration signal by the deceleration sensor to reception of the stop signal by the stop sensor to stop of the feed roller.
In order to shorten Tt, the feed roller is formed of an aluminum drum to reduce its inertia, or a material having a high coefficient of friction such as a rubber belt is used as a brake material of the feed roller, or the feed roller is driven. There is a method of using a servo motor as a motor to increase the responsiveness of the rotational speed of the roller to a deceleration signal, a stop signal, and an acceleration signal. The method is appropriately selected and used depending on the structure of a molding machine, molding conditions, and the like. FIG. 3 shows an example of an extruded product obtained by the processing method of the present invention. In this example,
An extruded product main body 51 formed in a wind molding shape is cut to a predetermined length, and cutouts 53 are formed in the umbrella-shaped portion 52 at regular intervals. FIG. 4 shows a method of processing the extruded product shown in FIG. In the figure, the same reference numerals as those in FIG. 1 indicate the same members. In this embodiment, in the processing step 19, a notch forming cutter 20 for forming the notch 53 at the front side of the feed roller 15 and a fixed-size cutting cutter 21 at the rear side are provided. A first sensor 22 for operating the notch forming cutter 20 and a second sensor 23 for operating the cutting cutter 21 are provided at predetermined positions behind the fixed-size cutting cutter 21. ing. The first sensor 22 includes a feed roller 15
And a deceleration sensor 25 provided in front of the stop sensor 24 and transmitting a deceleration signal to the feed roller 15. The second sensor 23 is provided behind the sensor 22 and similarly transmits a stop signal to the feed roller 15 and a stop sensor 26 provided in front of the stop sensor 26 to transmit a deceleration signal to the feed roller 15. And a deceleration sensor 27. The molded article 51 sent out by the feed roller 15 is first detected by the deceleration sensor 25 for the notch forming cutter 20 as passing therethrough. Thus, a deceleration signal of the feed roller is transmitted from the deceleration sensor 25, and the feed roller 15 is decelerated to a predetermined speed. Next, the stop sensor 2 of the first sensor 22
When the feed roller 4 detects the passage of the molded article 51 and emits a signal to stop the rotation of the feed roller 15, the notch forming cutter 2
0 operates to form a notch at a predetermined position of the molded article. After the cut-out portion is formed, the molded product 51 staying in the slack control unit 13 due to the stop of the feed roller 15 is sent out by the slack control unit 13 with the rotation of the feed roller 15 accelerated. When the molded article 51 further reaches the deceleration sensor 27 and the stop sensor 26 for the fixed-size cutting cutter 21 disposed behind the stop sensor 24, the signals from the sensors 26, 27 are used. Then, the feed roller 15 is again stopped at a predetermined feed position after deceleration to a predetermined speed, and the fixed-length cutting cutter 21 performs cutting to a predetermined length. As described above, according to the method for processing a continuously extruded product of the present invention, the feed roller is decelerated to a predetermined speed in front of the stop sensor for sending a stop signal to the feed roller. Since the deceleration sensor for transmitting the deceleration signal is provided, the speed of the molded product immediately before the stop signal is issued to the feed roller is always constant. Therefore, the time until the feed roller stops after receiving the feed roller stop signal is always constant, and the length of the molded product to be sent out is not varied, and processing such as cutting and forming a notch can be performed accurately. it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view showing an example of a method for processing a continuously extruded product. FIG. 2 is a graph showing a relationship between a feed speed and a feed length of a molded product. FIG. 3 is a perspective view showing an example of a continuously extruded product obtained by the processing method of the present invention. FIG. 4 is a schematic side view showing a method for processing the continuous extruded product shown in FIG. FIG. 5 is a graph showing a relationship between a feed speed and a feed length of a molded product according to a conventional method for processing a continuous extruded product. [Description of Signs] 15 Feeding Roller 20 Cutter for Forming Notch 21 Cutter for Cutting Standard Size 22 First Sensor 23 Second Sensor 24, 26 Stop Sensor 25, 27 Deceleration Sensor 51 Molded Product 53 Notch

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 47/00-47/96 B65G 43/00-43/10

Claims (1)

(57) [Claims] [Claim 1] A molded product continuously extruded from an extruder
(51) is sent out by the feed roller (15) and formed.
Form a notch at a predetermined position on the product, and then
Notch for forming a notch at the front side of the feed roller when cutting
Forming cutter (20), fixed length cutting cutter on the back side
(21) and the fixed-size cutter
At the rear, to operate the notch forming cutter
Stop sensor (24) and deceleration sensor (25)
Sensor (22) comprising:
A stop sensor (26) for actuating the
A second sensor (23) consisting of a deceleration sensor (27)
The feed row is provided by a deceleration sensor of the first sensor.
Speed to a predetermined speed and reduce to the specified speed.
Later, the feed is performed by a stop sensor of the first sensor.
Stop the roller and use the notch forming cutter
A notch is formed at a predetermined position of the molded article, and after the notch is formed, the feed roller is rotated to remove the molded article.
Sending out, then reduce the feed roller speed to a predetermined speed by a deceleration sensor of the second sensor, and after decelerating to the predetermined speed, stop the feed roller by a stop sensor of the second sensor , For the fixed-size cutter
Accordingly, a method for processing a continuous extruded product , comprising cutting the formed product to a predetermined length .