JP2000043072A - Sheet molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify constitution and to more certainly and accurately control the width of a sheet uniformly by detecting the position of one side edge of a rolled sheet to directly feed back the same to the rotational speed of a screw and a rotational speed of a calender roll. SOLUTION: A sheet material storage part 6 is provided between an extruder main body 3 and a calender roll 5. A side edge discrimination means 7 having inner and outer sensors 30A, 30B arranged so as to provide an interval in the width direction of the sheet S from the calender roll 5 and a control means increasing or decreasing the rotational speed of the screw or that of the calender roll 5 on the basis of the output of the side edge discrimination means 7 discriminating whether the side edge Se of the sheet S passes inside the inner sensor 30A or passes through the gap between the inner and outer sensors 30A, 30B or passes outside the outer sensor 30B are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet forming apparatus for controlling a bank amount of a sheet material between an extruder main body and a calender roll to uniformly control the width of a rolled sheet.

[0002]

2. Description of the Related Art In the extruder body, near a sheet material extrusion port,
2. Description of the Related Art A sheet forming apparatus is used in which a calender roll is arranged in a lateral direction perpendicular to an extrusion direction, and an extruded sheet material is directly rolled by a calender roll to form a sheet.

In such a sheet forming apparatus, in order to stabilize the width of a sheet to be rolled and form continuously,
It is necessary to stabilize the amount of the sheet material banked in the storage section between the sheet material extrusion port and the calender roll, that is, the bank amount within a predetermined range. If the bank amount is too small, the width of the sheet becomes narrow, making it difficult to secure the required product width, and the tensile stress is concentrated, and the sheet is likely to be cut. When the sheet is too large, the width of the sheet is widened, and the side edges thereof protrude from, for example, a carry-out conveyor, causing troubles in carrying out, and the like. Decrease production efficiency.

[0004]

Accordingly, in order to stabilize the bank amount, for example, in Japanese Patent No. 2698035, in a closed-bank type apparatus in which the storage section is closed, the pressure of the sheet material in the storage section is reduced. It discloses that the rotation of a screw and a calender roll of an extruder body is controlled based on the detection output by a load cell or the like. Japanese Patent Publication No. 5-39855 discloses that an open bank type device detects a height level of a sheet material banked in the storage section.

However, in each of these methods, a change in the sheet width is regarded as a change in the bank amount, and the change in the bank amount is further measured and controlled as a change in pressure or height. When the pressure changes or the temperature in the apparatus changes, the width of the sheet often changes even when the pressure or height is constant, resulting in poor accuracy or certainty.

The present invention is based on the fact that the position of one side edge of a rolled sheet is directly detected and fed back to the rotation speed of a screw or the rotation speed of a calender roll. It is another object of the present invention to provide a sheet forming apparatus which can be suitably adopted, has a simple structure, and can more reliably and accurately control the sheet width uniformly.

[0007]

To achieve the above object, the invention of a sheet forming apparatus according to claim 1 comprises an extruder body having a screw for extruding a sheet material, and a sheet material outlet of the extruder body. Forming a storage section for banking the sheet material extruded between the sheet material extruding port and the vicinity thereof and comprising a lower calender roll, and rolling by the calender roll on the downstream side of the calender roll. Side edge identification means having inner and outer sensors arranged at intervals in the width direction of the flowing sheet, and the side edge of the sheet passes inside the inside sensor, passes between inside and outside sensors, or passes outside. The rotation speed of the screw or the rotation speed of the calender roll is increased or decreased according to the output of the side edge identification means for identifying whether the sheet passes outside the sensor of the sheet. There has been characterized by providing a control means for adjusting the bank amount of banks.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a sheet forming apparatus 1 includes an extruder main body 3 having a screw 2 for extruding a sheet material, and a calender roll 5U, 5L disposed above and below a sheet material outlet 4 of the extruder main body 3. (Which may be referred to as a calendar roll 5 when collectively referred to), and a storage section 6 for banking the sheet material extruded from the sheet material extrusion port 4 is formed between the sheet material extrusion port 4 and the calendar roll 5. are doing.

As the sheet material, various rubber materials and synthetic resin materials can be used. In this embodiment, the case where the rubber sheet S is formed is exemplified.

Further, the sheet forming apparatus 1 includes side edge identifying means 7 for identifying the position of one side edge Se of the rubber sheet S which is rolled by the calender roll 5 and flows. Control means 9 for increasing or decreasing the rotation speed of the second roll or the rotation speed of the calender roll 5.

The extruder main body 3 is provided with, for example, an extrusion cylinder 15 which accommodates the screw 2 and is provided with a sheet material inlet 14 at a speed reducing portion 13 arranged on a base 12. The screw 2 rotates by being linked to a screw motor Mr, which is flanged to the speed reduction unit 13 via the speed reduction unit 13, for example. In this example, the rubber is extruded by kneading from the sheet material extrusion port 4 formed at the tip of the extrusion cylinder 15 by rotation.

The extruding cylinder 15 is supported at its distal end by a receiving stand 17 erected on the base 12, and a roll stand 21 erected on the receiving stand 17 is provided at both ends of the upper and lower calender rolls 5 U, 5 L. Is pivoted. The calender rolls 5U and 5L have their central axes perpendicular to the rubber extrusion direction from the sheet material extrusion port 4 and are laterally oriented.

As shown schematically in FIG. 1, the roll stand 21 pivotally supports the lower calender roll 5L at the upper edge thereof at substantially the same height as the rubber extrusion port 4 and also has an upper guide. The upper calender roll 5U is supported by a bearing box 24 which can be moved up and down while being guided by the window 23. The bearing housing 24 is rotatably mounted on the bearing housing 24 and is raised and lowered by a suitable lifting means using a linear motion device such as a screw shaft and a cylinder, which is screwed to the upper end of the roll stand 21, and Calendar roll 5L
The thickness of the rubber sheet S can be adjusted by adjusting the gap between the two.

In this embodiment, for example, the rotation axis of the lower calender roll 5L is linked to a calender motor Mc for driving the calender roll via a speed reducer provided on one of the roll stands 21, and the upper calender roll is connected. 5U
Is freely rotatable.

The upper calendar roll 5U may be driven, or both calendar rolls 5U and 5L may be driven. At that time, a calendar electric motor Mc may be used for each axis, or both may be driven by a transmission means using one calendar electric motor Mc.

As shown in FIGS. 2 and 3, the storage section 6 is an open bank type in which both sides are regulated by side guides 10 and 10 and the upper side is open, as shown in FIGS. In this example, the case where the lower part of the storage part 6 is opened by the sheet material extrusion port 4 approaching the calender roll 5 is shown. In addition, it may be an open bank type in which a guide plate is provided on the lower side and only the top is opened, or a closed bank type in which the upper and lower sides of the storage unit 6 are closed.

In the present embodiment, the side guides 10 are attached to the flange 26 at the tip of the extruder main body 3 in parallel with each other, and the projecting portions 10e of the side guides 10 are wedge-shaped between the upper and lower calender rolls 5U, 5L. It extends and guides the rubber without rolling out on both sides until it is rolled. The side guide 10 is attached to the flange portion 26 by a suitable attaching means so as to be displaceable in the lateral direction (width direction), so that the rubber sheet S to be rolled between the inner surfaces of the projecting portions 10e on both sides. Can be changed. As the mounting means, for example, an appropriate structure can be adopted, such as moving both side guides 10 and 10 simultaneously in the lateral direction using a screw shaft.

By driving the screw motor Mr, the extruder body 3 kneads the rubber fed from the sheet material inlet 14 and extrudes the rubber from the sheet material outlet 4 into the storage unit 6. Store (bank) in 6. In addition, the calender roll 5U rotates with the rotation of the calender roll 5L by the calender motor Mc, and the side guide 1 is adjusted while adjusting the amount of rubber in the storage section 6, that is, the amount of bank.
A rubber sheet S having a reference width W0 preset in accordance with 0 and 10 is formed with a stable sheet width W. Also rubber sheet S
Is carried out from the carry-out conveyor 28, for example.

For this purpose, the sheet forming apparatus 1
Has side edge identification means 7 and control means 9.

As shown in FIG. 3, the side edge discriminating means 7 is arranged at a downstream position close to the calender roll 5 with an interval in the width direction of the rubber sheet S from the calender roll 5. Inside and outside sensors 30A, 30
B is provided.

The inner and outer sensors 30A and 30B have a reference width W0 set in advance by the side guide 10.
4 is provided on one side edge Se of the rubber sheet S of FIG.
As shown in (A) to (C), the side edge Se passes inside the inner sensor 30A, or the inner and outer sensors 30A, 3
It continuously identifies whether it passes between 0B or outside than the outside sensor 30B.

The inner and outer sensors 30A and 30B are non-contact sensors such as light transmission type and light reflection type optical sensors. In this example, the sensor light from the photoelectric tube 31 is blocked by the rubber sheet S. Accordingly, the presence of the rubber sheet S at the position of the sensor unit 32 is detected. Therefore, in this example, the side edge identifying means 7 determines when the side edge Se passes between the inner and outer sensors 30A and 30B (FIG. 4).
(B)), the inner sensor 30A is turned off and the outer sensor 30B is turned on to identify that the sheet width W is in an appropriate state. When the side edge Se passes inside the inner sensor 30A (FIG. 4A), the inner and outer sensors 30A,
On the contrary, when the side edge Se passes outside the outer sensor 30B (FIG. 4 (C)), the inner and outer sensors 30 are turned on.
A and 30B are both turned off to identify that the sheet width W is in an excessive state.

The control means 9 increases or decreases the rotation speed of the screw 2 or the rotation speed of the calender roll 5 according to the identification signal output from the side edge identification means 7, and the rubber is banked in the storage section 6. Adjust the bank amount to be used.

More specifically, in the present embodiment, one of the screw motor Mr and the calendar motor Mc is constituted by a constant speed motor M1 rotating at a constant speed, and the other motor has a rotation speed of at least one. It is constituted by a variable speed motor M2 that can change the speed in two or more stages. Further, the control means 9 switches the variable speed motor M2 to the speed increasing side or the speed reducing side in accordance with the identification signal of the side edge identifying means 7, thereby increasing or decreasing the bank amount, and setting the sheet width W within the allowable range. Adjust and manage stably.

As shown in the flow chart of FIG. 5, the position of one side edge Se of the rubber sheet S rolled from the calender roll 5 is continuously detected by the side edge identification means 7 and is normally used. Sometimes, the sensor 30A inside
The extruder main body 3 and the calender roll 5 are operated in an appropriate state where is OFF and the outside sensor 30B is ON. For example, when the inner sensor 30A is turned on and the shortage state of the sheet width W is detected, the control means 9 moves the screw motor Mr to the speed increasing side or the calendar motor Mc.
Is switched to the deceleration side, and the seat width W is increased by increasing the bank amount. The outside sensor 30B is O
When the state becomes FF and the excessive state of the sheet width W is detected, the control means 9 switches the screw motor Mr to the deceleration side or switches the calendar motor Mc to the speed increase side, and reduces the bank width to reduce the sheet width W. .

As described above, the sheet forming apparatus 1 continuously detects the position of one side edge Se of the rubber sheet S and feeds it back directly to the rotation speed of the screw 2 or the rotation speed of the calender roll 5. Therefore, the time lag can be greatly reduced as compared with the conventional one, and moreover, the sheet width W can be controlled uniformly and accurately without being affected by the manufacturing conditions such as the type of sheet material or temperature. Can be. Moreover, two sensors 30A and 30B
Since the position of the side edge Se is detected only by ON / OFF of the motor, the structure of the motor used and the control means 9
The structure can be greatly simplified, which helps to reduce the cost of the apparatus, and can increase the reliability and reliability of the operation.

The variable-speed motor M2 is usually a two-speed motor, but for example, a three-speed or higher speed motor is used assuming that one speed change is not sufficient. You can also. Further, although the control becomes complicated, both the screw motor Mr and the calendar motor Mc may be constituted by variable speed motors.

The extruder body 3 can be modified into various modes such as using a twin screw type extruder, and the calender roll 5 can also be formed for forming rolled products having various cross-sectional shapes.

[0029]

As described above, according to the present invention, the position of one side edge of the rolled sheet is detected, and this is directly fed back to the rotation speed of the screw or the rotation speed of the calender roll. While it can be suitably adopted for both type and open bank type,
The structure can be simplified, and the width of the sheet can be controlled more reliably and accurately.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an embodiment of a sheet forming apparatus according to the present invention.

FIG. 2 is an enlarged cross-sectional view illustrating a storage unit.

FIG. 3 is a plan view showing a storage unit.

FIGS. 4A to 4C are cross-sectional views illustrating a state in which a side edge of a sheet is identified by a side edge identification unit.

FIG. 5 is a flowchart used in the present invention.

[Explanation of symbols]

 2 Screw 3 Extruder main body 4 Sheet material extrusion port 5, 5U, 5L Calendar roll 6 Storage section 7 Side edge identification means 9 Control means 30A, 30B Sensor S Sheet Se Side edge of sheet

Claims (1)

[Claims] 1. An extruder main body having a screw for extruding a sheet material, and a storage device arranged near a sheet material extruding port of the extruder main body and banking the sheet material extruded between the extruder body and the sheet material extruding port. And an upper and lower calender roll forming a portion, and side edge identification means having inner and outer sensors downstream of the calender roll and arranged at intervals in the width direction of the sheet rolled and flowed by the calender roll. And rotation of the screw by the output of the side edge identification means for identifying whether the side edge of the sheet passes inside the sensor inside, between the inside and outside sensors, or passes outside the outside sensor. A sheet forming apparatus provided with control means for increasing or decreasing the speed or rotation speed of a calender roll to adjust the amount of banking of the sheet material in the storage section.