JPH0475948A - Winding speed control method for noncircular drum manufacturing device - Google Patents

Abstract

PURPOSE:To keep the tension of a winding section applied to a sheet nearly constant by controlling the rotating speed based on the angular speed change of a formwork, or controlling the winding speed of the formwork with the tension of the winding section. CONSTITUTION:The rotating speed of a formwork at the contact portion B in contact with a virtual tangential line 23 for the rotary locus 25 of the top section 21a of a noncircular fiber drum 21 from the terminal section of a starching section is controlled slower than that at both side portions on a circular arc portion 24 cut by the virtual tangential line 23 for the inscribing circle of the rectangular fiber drum 21 from the terminal section of the starching section. The extracting speed of a sheet is kept nearly constant, and the winding speed is sharply improved without breaking the sheet.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a winding speed control method in a drum manufacturing apparatus that manufactures non-circular drums such as square or elliptical drums.

[Conventional technology]

Conventionally, for example, fiber drums have had a perfect circular shape. However, when storing perfectly circular fiber drums in warehouses or shipping them, dead space is created around them, making storage inefficient. In addition, due to design requirements, in recent years non-circular fibers such as square or oval shapes have been used. Drums are preferred. Therefore, when manufacturing a non-circular fiber drum such as a square or an ellipse, the simplest method is to first form a perfectly circular fiber drum and then use a mold to transform the outer periphery of this drum into the desired shape. In this method, the peripheral wall of the perfectly circular fiber drum is forcibly deformed, which not only tends to cause scratches on the appearance and lowers the product value, but also leaves stress on the deformed peripheral wall, reducing its strength. There was a problem that the durability was inferior due to the significant decrease. Therefore, in order to solve these problems, by reattaching the formwork of the circular (perfectly circular) fiber drum manufacturing equipment to the desired non-circular formwork, the conventional circular fiber drum manufacturing equipment can be used for its individual use. There is a method for manufacturing non-circular fiber drums such as square or oval shapes.

[Problem to be solved by the invention]

When manufacturing non-circular fiber drums using the conventional circular fiber drum manufacturing apparatus described above, the mold is rotated at a constant speed, so the top of the mold and its surroundings are The drawing speed of the base paper changes constantly due to the rotation of the frame. Therefore, strong tension is repeatedly applied to the drawn base paper intermittently, and this tension causes wrinkles or tears, which is a problem. Therefore, in order to prevent wrinkles or tears, the winding section must be rotated at a low speed during production, resulting in extremely poor productivity. The method of the present invention was proposed in view of the above-mentioned problems, and can be used to manufacture a non-circular drum made by winding a sheet-like material such as fiber or film around a mold, without causing wrinkles or tears. The purpose is to significantly improve productivity.

[Means to solve the problem]

In order to achieve the above object, the method for controlling the winding speed in the non-circular drum manufacturing apparatus according to the method of the present invention is to form a sheet supplied from a sheet supply section in a forming section, and to apply glue to one side of the formed sheet. In an apparatus for manufacturing a non-circular drum, the attachment is glued at the section and the drum is wound at the winding section onto a non-circular formwork which is rotationally driven by a rotational drive means,
Among the rotation locus of the top of the non-circular drum, the gluing is an arc section cut from the end of the section by a virtual tangent to the inscribed circle of the non-circular drum; The first method is to control the formwork so that the rotational speed at the point of contact where the virtual tangent to the rotation locus touches is slower than at both sides, and the tension in the sheet at the winding section is detected. However, in the second method, the driving speed of the rotational driving means is controlled so that this tension becomes constant.

[Operation] The sheet wound into a roll is supplied from the sheet supply section to the forming section, where the width of the sheet, that is, the height of the fiber drum is set, and then the sheet is supplied to the gluing section. In the gluing section, glue is applied to one side of the sheet, and then the sheet is supplied to a non-circular formwork of the winding section, which is rotated by a rotary drive means, and is wound up. It is formed into a cylindrical shape. Here, the gluing is a circular arc section cut from the end of the section by an imaginary tangent to the inscribed circle of the rectangular fiber drum, and the gluing is the arc section cut from the end of the section by the imaginary tangent to the rotation locus of the top of the non-circular fiber drum. In a structure in which the rotation speed of the formwork at the contact point is controlled to be slower than at the contact points on both sides, the speed at which the sheet is pulled out is kept approximately constant, so there is no fluctuation in the tension acting on the sheet. There is almost no wrinkles or damage, and the winding speed can be greatly improved. In addition, in the case where the rotational speed of the formwork is controlled by detecting fluctuations in the tension acting on the sheet in the winding section, controlling the rotation speed allows the tension acting on the sheet in the winding section to be approximately constant. This prevents the sheet from becoming wrinkled or damaged. [Example] Hereinafter, a winding speed control method in a non-circular fiber drum manufacturing apparatus of the present invention will be explained based on the drawings. <Example 1> Fig. 1 is a schematic side view of a rectangular fiber drum manufacturing apparatus that implements the method of the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is a front view of the winding section. 1 generally shows a rectangular fiber drum manufacturing apparatus. This rectangular fiber drum manufacturing apparatus 1 includes a base paper supply section 3 that supplies a base paper (sheet) 2 wound into a roll, and a base paper supply section 3 that cuts both sides or a central part of the base paper 2 supplied from the base paper supply section 3. There is a forming section 4 that sets the height of the fiber drum, a gluing section 5 that applies a sizing agent to the back side of the base paper 2 formed in the forming section 4, and a gluing section 5 that applies glue to the base paper 2 that has been glued in section 5.
and a winding part 7 for winding up the material around the outer peripheral surface of the formwork 6. The base paper supply unit 3 includes a brake device 9 that suppresses inertial rotational force at one end of a pivot shaft 8 that pivots the base paper 2 wound into a roll.
It is configured with the following. The forming unit 4 includes a plurality of guide rollers 10, 10, .
... is rotatably supported, and the guide roller 10
・10... Cutters 11, 11 that define both ends of the base paper in the width direction and a cutter that cuts the middle part of the width direction to a predetermined width and set the finished height of the fiber drum ( (not shown) are arranged so as to be movable and adjustable in the width direction of the base paper 2. The gluing section 5 scoops up the gluing agent supplied to the vat 13, which is formed to be vertically movable, with the applicator roller 14, and presses it down with a plurality of pressing rollers 15, 15, etc. arranged on the circumferential surface of the vat 13. It is configured to be applied to the back side of the base paper 2 that has been removed. The winding section 7 includes a rectangular formwork 6, a support shaft 16 that pivotally supports the formwork, and a support shaft 16 that is connected to the support shaft 16 via a deceleration device 17.
a servo motor (rotation drive means) 18 that rotationally drives the
Rotor encoder 19 detects the rotation angle of formwork 6
and a control device 20 that converts the output signal of the rotary encoder 19 into a servo motor 18 speed control signal. Next, a method of controlling the winding speed through the rectangular fiber drum manufacturing apparatus I configured as described above will be explained. First, the base paper 2 wound into a roll is transferred to the brake device 9
The material is supplied to the molding section 4 while being braked by the pressure and being given an appropriate tension. The base paper 2 supplied to the forming section 4 is cut at both ends or in a predetermined width direction by a cutter 11, and then sent to the gluing section 5, where the sizing agent scooped up by the roller 14 is applied to the base paper. It is applied to the back side of 2. The base paper 2, whose back surface is coated with glue, is wound multiple times around the circumferential surface of a rectangular formwork 6 which is rotationally driven by a servo motor 18 via a speed reducer 17.
Since the rotation of the servo motor 18 is controlled by the control device 20 based on the output signal of the rotary encoder 19, the formwork 6
The rotation speed of is controlled. As shown in FIG. 4, the rotational speed of the formwork 6 is determined such that the gluing is performed from the terminal end 5a of the section 5 to the virtual circle 22 inscribed in the rectangular fiber drum 21 formed by the winding section 7. When the top part 21a of the fiber drum 21 passes through the arc part 24 partitioned by the virtual tangent line (derived line of the base paper 2) 23 extending from the terminal end part 5a of the part 5, the point A on the upper side of the rotation is Fast rotation speed, fiber drum 2
Gluing is slow at a point B where the virtual tangent line (derived line of the base paper 2) extending from the terminal end 5a of the section 5 touches the virtual circle 25 of the rotation locus of the top portion 21a of the top portion I, and furthermore, the rotation of the top portion 21a is slow. At point C on the side, the control device 2 is operated based on the output signal of the rotary encoder 19 so that the rotation speed becomes faster again.
The rotation of the servo motor 18 is controlled by o. By changing the circumferential speed of the formwork 6 in accordance with changes in the rotation angle of the formwork 6, if the drawing speed of the base paper 2 from the gluing section 5 is kept approximately constant, there will be almost no fluctuation in the tension acting on the base paper 2. The winding speed can be greatly increased without wrinkles or damage. <Example 2> Although not shown in the drawings, the winding speed control method in the non-circular fiber drum manufacturing apparatus according to this example detects the tension acting on the base paper in the winding section, and uses fluctuations in this tension to control, for example, the above-mentioned The rotation of the servo motor 18 of the first embodiment is controlled. In this way, when the rotational speed of the formwork is controlled by detecting fluctuations in the tension acting on the base paper at the winding section, controlling the rotational speed can reduce the tension acting on the base paper at the winding section approximately. Since it is kept constant, the base paper is prevented from wrinkling or being damaged. <Example 3> Furthermore, the winding section 7 of the above-mentioned Example 1 is modified by interposing a transmission torque setting device such as a torque limiter or a powder clutch between the support shaft 16 of the formwork 6 and the reduction gear 17, If the slipping is automatically performed when there is a change in the tension acting on the base paper 2, the rotation speed of the formwork 6 will automatically change, and the tension on the base paper 2 can be kept approximately constant. It is. In the above example, the base paper is wound around the formwork to form a square fiber drum, but instead of the base paper, a sheet-like material such as a synthetic resin film, thin metal plate, cloth, etc. can be wound around the formwork. Of course, the method of the present invention can also be carried out when a non-circular drum is formed. Furthermore, although the above embodiment has been explained using an apparatus for manufacturing a square fiber drum, it goes without saying that the present invention can also be carried out when forming a triangular, polygonal or more triangular, elliptical or oblong fiber drum. There is no such thing.

【Effect of the invention】

As explained above, according to the method for controlling the winding speed in the non-circular drum manufacturing apparatus of the present invention, the rotational speed of the formwork can be controlled based on changes in the angular velocity of the formwork, and the tension of the winding section can be used to control the winding speed of the formwork. Since the winding speed is controlled, the tension acting on the sheet at the winding section can be kept approximately constant. This allows the rotation speed of the formwork to be increased,
The advantage is that manufacturing of non-circular drums can be greatly improved. In addition, the non-circular drum manufactured in this way has no internal residual stress and has much higher strength and durability than a non-circular drum that is formed by forming one end into a circular shape and then pressing the circumferential surface to form a non-circular drum. There is also the advantage of being more expensive.

[Brief explanation of drawings]

The drawings show a rectangular fiber drum manufacturing apparatus for implementing one method of the present invention, in which Fig. 1 is a schematic side view, Fig. 2 is a plan view thereof, Fig. 3 is a front view of the winding section, and Fig. 4. FIG. 2 is an explanatory diagram of control of winding speed. 1... Fiber drum manufacturing equipment, 2... Sheet (
base paper), 3... sheet supply section (base paper supply section), 4...
・Molding part, 5...Gluing part, 5a...Terminal part of 5,
6... Formwork, 18... Rotation drive means (servo motor), 21... Non-circular fiber drum, 22... Inscribed circle, 2... Arc portion, 25. 6... Virtual tangent , B...Both sides of B.

Claims (2)

[Claims] (1) A sheet supplied from the sheet supply section is formed in the forming section, one side of the formed sheet is glued at the gluing section, and a non-circular formwork is rotationally driven by a rotational drive means at the winding section. In an apparatus for manufacturing a non-circular drum, in which the rotation locus of the top of the non-circular drum is cut by an imaginary tangent to the inscribed circle of the non-circular drum from the terminal end of the glued part, A non-circular device characterized in that the rotational speed of the formwork is controlled so that the rotational speed of the formwork at the contact point where the virtual tangent to the rotation locus of the top of the non-circular drum touches from the end of the glued part is slower than at both sides thereof. Winding speed control method in drum manufacturing equipment. (2) The sheet supplied from the sheet supply section is formed in the forming section, one side of the formed sheet is glued at the gluing section, and the non-circular formwork is rotationally driven by a rotational drive means at the winding section. A non-circular drum manufacturing device that detects the tension of a sheet in a winding section and controls the driving speed of a rotational drive means so that this tension is constant. Winding speed control method.