KR102522719B1 - Apparatus for cutting body ply cord of tire and method therefor - Google Patents

Abstract

The present invention relates to a device and method for cutting the body ply cord of a tire, which can improve dents by removing the rigidity of a joint portion of a body ply during the molding process. Among these, the device for cutting the body ply cord may comprise: a stand disposed on a transfer path where the body ply is transferred; a cutting knife mounted on the stand to be capable of being raised and lowered to cut the end of the body ply in the longitudinal direction; and an actuator driven and connected to the cutting knife so that the cutting knife is raised and lowered.

Description

Tire body ply cord cutting device and cutting method {APPARATUS FOR CUTTING BODY PLY CORD OF TIRE AND METHOD THEREFOR}

The present invention relates to a tire body ply cord cutting device and method.

In general, tire production processes include a refining process in which rubber, which is a raw material, is mixed with chemicals, a rolling/extruding/cutting process in which the compounded rubber is manufactured into semi-finished products, a molding process in which manufactured semi-finished products are assembled to produce green tires, , a curing (vulcanization) process in which heat and pressure are applied to a green tire to give an elastic body, and the like.

In particular, in order to manufacture a tire in a molding process, a cylindrical body ply is formed by winding the body ply around a forming drum in a circumferential direction. In addition, in order to prevent the body ply from widening when forming a green tire, a cylindrical body ply wound with a body ply sheet in a circumferential direction on a building drum has a joint portion overlapping a start portion and an end portion.

However, in the case of a conventional pneumatic tire, a difference in stiffness occurs between the joint of the cylindrical body ply and the non-overlapping portion, so when air is injected into the tire after manufacturing the tire, the joint portion of the body ply is dented due to the rigidity of the joint portion of the body ply. A so-called appearance defect is caused.

Patent Publication No. 10-2010-0043316 (published on April 29, 2010)

Embodiments of the present invention are intended to provide a tire body ply cord cutting device and cutting method capable of improving dents by removing stiffness of a joint portion of a body ply in a molding process.

According to one aspect of the present invention, the pedestal disposed on the transport path through which the body ply is transported; a cutting knife installed to be liftable from the pedestal to cut an end of the body ply in a longitudinal direction; and an actuator driven and connected to the cutting knife to move the cutting knife up and down.

At this time, the body ply cord cutting device includes a sensor for measuring a moving distance of an end of the body ply moving on the upper surface of the pedestal; And after comparing the preset overlapping distance of the end of the body ply, which is overlapped when the body ply is wound around the forming drum, and the end movement distance measured by the sensor, the end movement distance is determined by the preset overlapping distance. The controller may further include a controller controlling an operation of the actuator so that an end of the body ply is cut by the cutting knife until the distance is reached.

In addition, the end of the body ply may include any one of a starting end or a distal end of the body ply that is overlapped when the body ply is wound around the forming drum.

In addition, the transfer path includes a path guided by a plurality of body ply servicers disposed in succession to transfer the body plies, and the pedestal may be disposed between the plurality of body ply servicers.

In addition, the cutting knife may include a support portion driven and connected to the actuator; a bending portion extending from an upper portion of the support portion in one direction toward the body ply; and a cutter part extending obliquely downward in one direction from a lower part of the bending part to cut an end of the body ply.

In addition, a knife moving groove through which the cutting knife can enter and exit may be formed on the pedestal extending in a longitudinal direction of the pedestal.

According to one aspect of the present invention, the step of waiting for the cutting knife of the above-described body ply cord cutting device on the transfer path where the body ply is transported; forwardly moving the bodyply onto an upper surface of a pedestal of the bodyply cord cutting device; measuring a moving distance of an end of the body ply moving in a forward direction on an upper surface of the pedestal; and controlling to cut the front end of the body ply through the cutting knife until the end movement distance reaches a preset overlapping distance.

Embodiments of the present invention have an advantage in that appearance defects due to dents can be improved by minimizing the stiffness of the joint portion of the body ply.

In addition, in the embodiments of the present invention, by cutting one of the beginning or end of the joint of the body ply, the beginning and end of the body ply overlap to prevent widening, and at the same time, one side of the cord is cut to increase rigidity. Since is eliminated, there is an advantage in that dents can be improved by having the stiffness of the joint portion of the body ply equal to that of the non-overlapping portion.

1 is a front view showing a body ply cord cutting device for a tire according to an embodiment of the present invention.
2 is a plan view showing a body ply cord cutting device for a tire according to an embodiment of the present invention.
FIG. 3 is an enlarged view of the line “A” of FIG. 2 .
4 is a side view illustrating a state before cutting of a body ply in a device for cutting a body ply cord of a tire according to an embodiment of the present invention.
5 is a side view illustrating a state after cutting a body ply in a device for cutting a body ply cord of a tire according to an embodiment of the present invention.
6 is an enlarged view of part “B” of FIG. 4 .
7 is a state diagram showing a state in which the body ply cut by the body ply cord cutting device of a tire according to an embodiment of the present invention is wound around a forming drum.
FIG. 8 is an enlarged view of part “C” of FIG. 7 .
9 is a block diagram illustrating a method of cutting a body ply cord of a tire according to an embodiment of the present invention.
10 to 15 are state diagrams illustrating a method of cutting a body ply cord of a tire according to an embodiment of the present invention.

Hereinafter, specific embodiments for implementing the spirit of the present invention will be described in detail with reference to the drawings.

In addition, in the description of the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

In addition, when a component is referred to as 'connecting', 'supporting', 'connecting', 'supplying', 'transferring', or 'contacting' to another component, it is directly connected to, supported by, or connected to the other component. It may be supplied, delivered, or contacted, but it should be understood that other components may exist in the middle.

Terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In addition, in this specification, expressions such as upper, lower, side, etc. are described based on the drawings, and it is made clear in advance that they may be expressed differently if the direction of the object is changed. For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated, and the size of each component does not entirely reflect the actual size.

In addition, terms including ordinal numbers, such as first and second, may be used to describe various components, but the components are not limited by these terms. These terms are only used to distinguish one component from another.

As used herein, the meaning of "comprising" specifies specific characteristics, regions, integers, steps, operations, elements, and/or components, and other specific characteristics, regions, integers, steps, operations, elements, elements, and/or groups. does not exclude the presence or addition of

1 is a front view showing a body ply cord cutting device for a tire according to an embodiment of the present invention, FIG. 2 is a plan view showing a body ply cord cutting device for a tire according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the line "A", Figure 4 is a side view showing a state before cutting the body ply in the body ply cord cutting device of the tire according to an embodiment of the present invention, and Figure 5 is a side view of the present invention In the device for cutting the body ply cord of a tire according to the embodiment, it is a side view showing the state after cutting the body ply, and FIG. 6 is an enlarged view of part “B” of FIG. 4, and FIG. This is a state diagram showing a state in which the body ply cut by the body ply cord cutting device of the tire is wound around the forming drum, and FIG. 8 is an enlarged view of part “C” of FIG. 7 .

1 to 8, the body ply cord cutting device 10 of a tire according to an embodiment of the present invention cuts the end of the body ply P before the body ply P is wound around the forming drum 30. By forming the incision groove (H) in (P1), when the body ply (P) is wound around the forming drum (30), the stiffness at the end (P1) of the overlapping body ply (P) can be minimized.

Here, the end P1 of the body ply P is the starting end P11 or/and the distal end 12 of the body ply P that is overlapped when the body ply P is wound around the forming drum 30. ) may be any one of In this embodiment, the end P1 of the body ply P may be the starting end P11 of the body ply P, but is not limited thereto, and the end P1 of the body ply P may be the body ply P11. It may be the distal end 12 of (P), or may include both the start end (P11) and the distal end (12) of the body ply (P).

The body ply cord cutting device 10 may include a pedestal 100, a cutting knife 200, an actuator 300, a detection sensor 400, and a controller 500. The pedestal 100 may be disposed on a transport path on which the body ply P is transported. Here, the transfer path may be understood as a path in which the transport of the body plies P is guided by a plurality of body plies P servicers arranged in succession. The pedestal 100 may be disposed between a plurality of body ply (P) servers.

A knife moving groove 101 through which the cutting knife 200 can enter and exit may be formed in the pedestal 100 . The knife moving groove 101 may extend in the longitudinal direction of the support 100 to correspond to the cutting knife 200 . A plurality of knife moving grooves 101 may be provided in parallel and spaced apart from the pedestal 100 .

At this time, the longitudinal separation distance (L1) between the knife moving groove 101 and the cutting knife 200 may be formed longer than the widthwise separation distance (W1) between the knife moving groove 101 and the cutting knife 200. there is. As the longitudinal distance L1 between the knife moving groove 101 and the cutting knife 200 is formed longer than the widthwise distance W1 between the knife moving groove 101 and the cutting knife 200, the body When the end P1 of the ply P is cut by the cutting knife 200, the lifting operation of the cutting knife 200 in the knife moving groove 101 can be made smoothly.

The cutting knife 200 may be installed on the elevating plate 310 so as to be elevating from the pedestal 100 . The cutting knives 200 may be provided in a plurality that are arranged side by side and spaced apart from the upper part of the elevating plate 310 . These plurality of cutting knives 200 may be located at points corresponding to the knife moving grooves 101 . The cutting knife 200 moves in and out of the knife moving groove 101 of the pedestal 100 when the lifting plate 310 moves up and down, so that the end P1 of the body ply P can be cut in the longitudinal direction.

The cutting knife 200 may include a support part 210 , a bending part 220 and a cutter part 230 . The support part 210 may be driven and connected to the actuator 300 via the elevating plate 310 . A lower end of the support part 210 may be fixed to the elevating plate 310 and an upper end of the support part 210 may be integrally formed with the bending part 220 .

The bending portion 220 of the cutting knife 200 may be bent and extended in one direction toward the body ply P from the top of the support portion 210 . A cutter portion 230 may be formed below the bending portion 220 . At this time, the extended length of the cutter portion 230 may be longer than the predetermined overlapping distance of the end portion P1 of the body ply P, which is overlapped when the body ply P is wound around the forming drum 30. .

The cutter portion 230 may be shaped like a blade extending from the lower portion of the bending portion 220 at a downward slope in one direction. When the cutting knife 200 is lowered in the knife moving groove 101 of the pedestal 100, the cutter unit 230 cuts the end P1 of the body ply P, so that the end ( A cutout groove (H) may be formed in P1).

The actuator 300 may be driven and connected to the cutting knife 200 through the elevating plate 310 . When the actuator 300 is moved up and down, the cutting knife 200 can move in and out from the knife moving groove 101 of the pedestal 100 while being moved up and down by the lift operation of the actuator 300 .

The detection sensor 400 may be at least one or more sensors installed on the pedestal 100 . The detection sensor 400 may measure the moving distance of the end of the body ply P moving on the upper surface of the pedestal 100 . The detection sensor 400 may measure the moving distance of the end of the body ply P from the upper surface of the pedestal 100 in consideration of the preset moving speed of the body ply P.

The controller 500 receives the preset overlapping distance and end movement distance of the body ply P, and the actuator so that the end P1 of the body ply P is cut until the end movement distance reaches the preset overlapping distance. The operation of 300 can be controlled.

For example, the controller 500 determines the preset overlapping distance of the end P1 of the body ply P, which is overlapped when the body ply P is wound around the forming drum 30, and the sensor 400. After comparing the end movement distance, the operation of the actuator 300 is controlled so that the end P1 of the body ply P is cut by the cutting knife 200 until the end movement distance reaches the preset overlapping distance. can

[Example]

As a result of the test according to the present invention, the smaller the cutting interval / the longer the cutting length of the body ply, the more effective it is in improving the dent. The test results are shown in Table 1 below.

[Table 1]

9 is a block diagram illustrating a method for cutting body ply cords of a tire according to an embodiment of the present invention, and FIGS. 10 to 15 are state diagrams illustrating a method for cutting body ply cords of a tire according to an embodiment of the present invention.

9 to 15, the method 20 for cutting the body ply cord of a tire according to an embodiment of the present invention includes the steps of waiting for a cutting knife on the transport path where the body ply is transported (S100), and the support Moving the body ply in the forward direction on the upper surface of the body ply (S200), measuring the moving distance of the end of the body ply (S300), controlling to cut the front end of the body ply (S400), and on the upper surface of the pedestal It may include moving the body ply in a reverse direction (S500), moving the body ply in a forward direction on the upper surface of the pedestal (S600), and cutting the rear end of the body ply (S700).

As shown in FIG. 10, in the step of waiting for the cutting knife on the transfer path where the body ply is transported (S100), as the actuator of the body ply cord cutting device 10 is operated, the cutting knife is raised It may protrude into the knife moving groove of the pedestal. At this time, the cutting knife may stand by on the transfer path where the body ply is transferred.

As shown in FIG. 11 , in the step of moving the body ply on the upper surface of the pedestal in the forward direction (S200), the body ply may be moved in the forward direction on the upper surface of the pedestal of the body ply cord cutting device.

In the step of measuring the movement distance of the end of the body ply (S300), the movement distance of the end of the body ply moving forward on the upper surface of the pedestal may be measured.

As shown in FIG. 12, in the step of controlling to cut the front end of the body ply (S400), the end movement distance measured in the step of measuring the end movement distance of the body ply (S300) reaches a predetermined overlapping distance. , operation of the actuator may be controlled to cut the front end of the body ply through the cutting knife.

For example, in the step of controlling to cut the front end of the body ply (S400), a preset overlapping distance of an end of the body ply, which is overlapped when the body ply is wound around a forming drum, and an end movement distance may be compared. The operation of the actuator may be controlled so that the end of the body ply is cut by the cutting knife until the end movement distance reaches the set overlapping distance. When the cutting of the front end of the body ply is completed, the cutting knife may be lowered and inserted into the knife moving groove of the pedestal by the operation of the actuator.

As shown in FIG. 13, in the step of moving the body ply in the reverse direction on the upper surface of the pedestal (S500), when an incision is formed at the front end of the body ply by cutting, the body ply having the incision groove is formed in the reverse direction on the upper surface of the pedestal can be moved

As shown in FIG. 14, in the step of moving the body ply onto the upper surface of the pedestal in the forward direction (S600), if the front end of the body ply deviates from the upper surface of the pedestal, the body ply can be moved forward onto the upper surface of the pedestal. At this time, the cutting knife may be kept inserted into the knife moving groove of the pedestal.

As shown in FIG. 15, in the step of cutting the rear end of the body ply (S700), when the body ply is moved from the upper surface of the pedestal by the length of the body ply wound around the forming drum in the circumferential direction, the rear end of the body ply is cut. can do.

When the cutting of the body plies is completed, the body plies having cut grooves are moved to the space where the forming drum is located, and the above-described process is repeated for the remaining body plies without cut grooves.

As described above, the present invention can improve appearance defects due to dents by minimizing the stiffness of the joint portion of the body ply, and cutting one of the beginning or end portion of the joint portion of the body ply to start the body ply. Since the part and the end part overlap, it is possible to prevent widening, and at the same time, since the cord on one side is cut and the rigidity is lost, the stiffness of the joint part of the body ply has the same stiffness as the non-overlapping part, so that dents can be improved. can provide great advantages.

Although the body ply cord cutting device of a tire according to an embodiment of the present invention has been described as a specific embodiment, this is only an example, and the present invention is not limited thereto, and the widest range according to the basic idea disclosed herein should be interpreted as having A person skilled in the art may implement a pattern of a shape not indicated by combining/substituting the disclosed embodiments, but this also does not deviate from the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on this specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

10: body fly cord cutting device
100: base 101: knife moving groove
200: cutting knife 210: support
220: bending part 230: cutter part
300: actuator 310: lifting plate
400: detection sensor
500: controller

Claims (7)

a pedestal disposed on a transport path through which body plies are transported;
a cutting knife movably installed on the pedestal to cut an end of the body ply in a longitudinal direction;
an actuator driven and connected to the cutting knife so that the cutting knife moves up and down;
a detection sensor for measuring a moving distance of an end of the body ply moving on the upper surface of the pedestal; and
After comparing the preset overlap distance of the end of the body ply, which is overlapped when the body ply is wound around the forming drum, and the end movement distance measured by the detection sensor, the end movement distance is the preset overlap distance And a controller for controlling the operation of the actuator so that the end of the body ply is cut by the cutting knife until reaching
Tire bodyply cord cutting device. delete According to claim 1,
The end of the body ply is
Including either a starting end or a distal end of the body ply that overlaps when the body ply is wound on a forming drum,
Tire bodyply cord cutting device. According to claim 1,
The transfer route is
Includes a path guided by a plurality of body ply servicers arranged in succession so that the body ply is transported;
the pedestal
Disposed between the plurality of body fly servicers,
Tire bodyply cord cutting device. a pedestal disposed on a transport path through which body plies are transported;
a cutting knife movably installed on the pedestal to cut an end of the body ply in a longitudinal direction; and
And an actuator driven and connected to the cutting knife so that the cutting knife is raised and lowered.
The cutting knife
a support portion driven and connected to the actuator;
a bending portion extending from an upper portion of the support portion in one direction toward the body ply; and
And a cutter part extending obliquely downward in the one direction from the bottom of the bending part to cut the end of the body ply.
Tire bodyply cord cutting device. a pedestal disposed on a transport path through which body plies are transported;
a cutting knife movably installed on the pedestal to cut an end of the body ply in a longitudinal direction; and
And an actuator driven and connected to the cutting knife so that the cutting knife is raised and lowered.
On the pedestal
A knife moving groove through which the cutting knife can enter and exit is formed extending in the longitudinal direction of the pedestal,
Tire bodyply cord cutting device. Standing by the cutting knife of the body ply cord cutting device according to claim 1 on the transfer path where the body ply is transferred;
forwardly moving the bodyply onto an upper surface of a pedestal of the bodyply cord cutting device;
measuring a moving distance of an end of the body ply moving in a forward direction on an upper surface of the pedestal; and
Controlling to cut the front end of the body ply through the cutting knife until the end movement distance reaches a preset overlapping distance,
How to cut a tire's bodyply cord.

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