JPH0621706Y2 - Tread material winding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field The present invention relates generally to a device for multiple winding of strips of tread material around a tire casing, and more particularly to a winding head.

BACKGROUND OF THE INVENTION Traditionally, a winding head has been movable on a platform in the radial direction of the tire to bring the winding into contact with the surface of the tire casing. The winding head was mounted on a support rotatably supported on the platform to swing the winding head around a pivot point at a constant radius close to the radius of the tread surface. The strip was wrapped around the tire casing by swinging from one shoulder of the tire casing to the other as the tire casing rotated. As a result, the pressure exerted by the winding head on the strip on the surface of the tire casing was not uniform. Further, since the tension of the strip when wound around the surface of the tire casing changes, the strip stretches and the winding is uneven. The position of each rotation of the strip has been determined by various means. However, the location of the center of each strip was not predetermined, requiring expensive fracture inspection techniques including slitting the tire to examine the resulting contour.

SUMMARY OF THE INVENTION The present invention is capable of moving the winding head so that it is positioned as accurately as possible on the surface of the tire casing when winding the strip according to the schematic representation of the particular tread to be wound. It concerns a device. The position at which wrapping begins is determined by a particular combination of coordinates including the angle at which the strip is pressed against the surface of the tire casing. The surface velocity of the tire casing is also controlled to maintain a uniform molded shape.

Means for Solving the Problems According to the interpretation of the present invention, a plurality of wraps of a shaped strip of tread material are accurately positioned for each wrap at predetermined locations on the surface of the tire casing. Winding the casing using a winding head attached to position the strip, press the strip at a predetermined angle with respect to the surface of the tire casing (a) ~
The method consisting of (h) is shown.

(a) X coordinate is the distance from the center plane of the tire casing, Y
The coordinates are the distance from the axis of rotation of the tire casing, and the Z coordinate is the angle between the line perpendicular to the plane in contact with the tire casing and the plane parallel to the center plane of the tire casing at the centroid of the strip. The centroid of each winding of the strip represented by this X, Y and Z is used to define the stacking cross section of the tread, (b) at the position defined by the coordinates of the first winding of the strip. Winding the strip around the tire casing by pressing the tip of the strip against the surface of the tire casing with a winding head, (c) the strip such that the strip is pressed against the surface of the tire casing at an angle equal to the first Z coordinate. Rotating the tire casing with the winding head of (1) above, and (d) placing the tire casing on the tire support wheel in the first Y direction.
Rotating the strip winding head of the strip at a rotational speed such that the surface portion of the tire casing having a diameter equal to the coordinates has a surface speed substantially equal to the feed rate of the strip to the strip winding head; With respect to the second turn, one rotation of the tire casing moves from the first X coordinate to the second X coordinate in the axial direction of the tire casing. (F) The strip winding head is moved to the second turn of the strip. With respect to the first Y-coordinate to the second Y-coordinate, the tire casing is moved in one rotation in the radial direction of the tire casing, (g) For each successive winding of the strip, X,
Using the Y and Z coordinates and the surface velocity, (b), (c), (d),
Repeat steps (e) and (f) until all the windings specified on the laminate cross section have been applied to the tire casing, (h) cutting the strip and retracting the winding head from the surface of the tire casing. .

The present invention uses the method described above to wind multiple wraps of a shaped strip of tread material into precisely defined locations on a rotating tire casing defined by X and Y coordinates. To press at a predetermined angle with respect to the surface of the tire casing defined by the Z-coordinate. The apparatus comprises the following (a) to (k).

(a) a supporting wheel of the tire casing mounted so as to rotate around the axis of the spindle, (b) a winding head mounted on a column of the winding head, (c) a column of the winding head above. Has a base rotatably mounted on the upper platform, and (d) the upper platform is slidably mounted on the lower platform for movement in a direction parallel to the axis of the spindle, e) The lower platform is slidably mounted on the support surface so that it can be moved closer to and further from the axis of the spindle, and (f) a strut drive means for rotating the strut of the winding head, and a predetermined Column drive to rotate the column up to a certain angle with respect to the surface of the tire casing to press the strip against the surface of the tire casing at an angle of Rotation control means for moving the means, (g) upper platform drive means for moving the upper platform on the lower platform, and when a strip of tread material is wrapped around the surface of the tire casing, the upper platform is Upper platform control means for moving the upper platform drive means for axial movement to a predetermined position, (h) lower platform drive means for moving the lower platform on the support surface, and a strip of tread material When wrapped around the surface of the casing,
Lower platform control means for moving the lower platform drive means for moving the lower platform to a predetermined position in the radial direction of the tire casing, (i) spindle drive means for rotating the tire casing support wheel, and tire casing support Spindle rotation control means for moving the spindle drive means for rotating the wheel at a speed varying in response to the feed speed input, (j) upstream of the winding head to detect the feed speed of the strip to the winding head A speed sensor that contacts the strip of material at (k) a spindle speed sensor attached to the spindle to detect the speed of rotation of the spindle.

For the purpose of informing those skilled in the art which are closely related to the present invention, reference is made to the accompanying drawings, in which preferred embodiments showing the best mode for carrying out the invention are incorporated herein by reference. It is described by. The embodiments shown and described herein are intended to be illustrative, as will be apparent to those skilled in the art within the spirit and scope of the invention as defined in this utility model claim. It can be modified in many ways.

EXAMPLE In the drawings, and in particular FIGS. 1 and 2, a strip 12 of elastomeric material such as rubber is extruded by an extrusion process that includes a cold extrusion machine, roller dies and cooling rollers (not shown). 1 illustrates a molded and cooled tread winding device 10. Strip 1
2 is fed via rollers 14 to a winding head 16 which is pressed against the surface 18 of a tire casing 20 mounted on a tire support wheel 22. The tire support wheel 22 has a spindle 24 rotatably mounted on a tire support stand 26 mounted on a support surface, such as a floor 28. A spindle rotation sensor, such as a spindle encoder 30, is mounted on a stand 26 and is in contact with the spindle 24 to detect the rotational speed of the tire support wheels. Spindle drive means, such as a DC motor 32 which receives control commands from the servomechanism, are also attached to the tire support stand 26 and through a suitable controller 34 at the desired rotational speed at the tire support wheel 22.
Is coupled to the power supply to rotate.

The winding head 16 is mounted on a post 36 which is rotatably supported on an upper platform 38. The struts 36 are inclined towards the winding head in a direction away from the axis 39 of the spindle 24 from the base. Post 36
Can rotate about a vertical axis AA as shown in FIG. The ring gear 40 is mounted on the base of the stanchion 36 and meshes with a pinion gear 42 driven by a stanchion drive motor 44, such as a DC servo motor for rotating the stanchion 36 and the winding head 16 about the AA axis. ing. A column drive motor 44 for rotating the column 36 is coupled to a suitable power source via the controller 34.

Upper platform 38 is lower platform 50
It has a slide 46 slideably mounted on an upper rail 48. The nut member 52 is attached to the bottom of the upper platform 38 and mates with a drive screw 54 that is coupled to an upper platform drive motor 56, such as a DC motor. Upper platform drive motor 56 is coupled to a suitable power source via controller 34.

Lower platform 50 has slides 58 slidably mounted on rails 60 mounted on a supporting surface such as floor 28. The nut member 62 is mounted on the lower portion of the lower platform 50 and is threadedly engaged with a drive screw 64 which is coupled to a lower platform drive motor 66 mounted on the floor 28. Lower platform drive motor 66 is coupled to a suitable power source through controller 34. As shown in FIG.
Lower platform 50 and upper platform 38
May be installed in the pit 68 in the floor 28.

The winding head 16 may also include a spring biasing member 70 for pressing the strip 12 against the surface 18 of the tire casing 20. A surface velocity sensor, such as the winding head encoder 72, is used to
It may also be mounted on the winding head in contact with the surface 18 of the tire casing 20 in order to detect the actual surface speed at the position where the 2 is wound. A velocity sensor, such as an upstream encoder 74, may be located on the chill roll (not shown) to detect the feed rate at the location where the strip 12 is fed to the winding head 16. The upper part of the winding head encoder 72 and the upstream part of the encoder 74 are sent to the controller 34.

As shown in FIG. 1, the winding head 16 includes a strip 12 having a central surface MM and a surface 18 of the tire casing 20.
It is pressed against the surface 18 of the tire casing along a line corresponding to the line of intersection with. FIG. 3 shows the central plane MM.
A partial cross-sectional view of the tire casing 20 is shown along with the intersection line 76 delineating the tire carcass. The axis line XX corresponds to the axis line 39 of the spindle 24, and the axis line Y
-Y corresponds to the line of intersection between the center plane of the tire casing 20 and the center plane MM. The Z coordinate indicates the angle between the center line H-H of the winding head 16 and the plane P-P parallel to the center plane of the tire casing 20. In FIG. 3, the winding head 16 is shown in three positions by dashed lines with a centerline H-H perpendicular to the line T-T tangent to the surface 18 of the tire casing 20. It is clear that the Z coordinate for the first wrap 78 of strip 12 is about -55 °. The Z coordinate of the intermediate wrap 80 is 0 ° and the Z coordinate for the wrap 82 is approximately + 9 °. In FIG. 2, the Z coordinate for winding 82 is approximately + 35 °.

The wraps 78, 80, 82 are examples of multiple overlapping wraps that make up the stacked tread 84. The X and Y coordinates of these wraps are measured from axes XX and YY as shown in FIG. The X coordinate for the centroid C is the line Y-
It is the distance from the center plane of the tire indicated by Y.
The Y coordinate of the centroid C for each winding is the centroid and the axis XX.
That is, it is the distance from the axis 39 of the spindle 24.

In FIG. 3, the layers of winding of strip 12 are shown with three windings 78, 80 and 82. Strip 1
These two coordinates are obtained from a schematic representation drawn on a CAD (Computer Aided Drafting) machine. The operator determines the coordinates of the inner contour line 85 of the tread 84 and the outer contour line 86 of the tread for a particular tire specified by the tire design engineer. The data is then the width of the strip,
It is fed into the CAD machine for thickness and starting position. The first direction of travel of the winding head 16 is indicated,
And the spacing between the centroids C of the offset or overlapping windings of strip 12 is shown. The CAD machine then
It is incorporated into the program to provide a graphical representation of the cross section of the tread 84 showing the position of each winding of the strip 12 forming the tread. The cross section of each winding of strip 12 has a data point at the centroid C of the strip, which data point is shown in FIG.
And Z coordinate. The coordinate data from the graphical representation on the CAD machine is then sent to the controller 34 for the device 10. It goes without saying that this data can be obtained by other drafting techniques if desired.

In practice, strips 12 of tread material are molded from a cold extrusion machine through roller dies (not shown) to provide strips of uniform cross section and desired shape. The strip 12 is then cooled by chill rollers or other suitable means (not shown),
It is then conveyed to the winding head 16 and pressed against the surface 18 of the tire casing 20. Tire support wheel 2
The tire casing 20 mounted on 2 is rotated at a control speed in which the surface speed of the portion of the surface 18 of the tire casing on which the strip 12 is wound is the same as the feed speed sensed by the upstream encoder 74. . The speeds sensed by the upstream encoder 74 and the spindle encoder 30 are compared by the control means 34, and the DC motor 32 is rotated by the winding head 1.
It is activated to rotate so that the surface velocity at 6 is the same as the feed velocity sensed by the upstream encoder. When determining the rotational speed of the tire casing 20, the Y coordinate indicating the diameter of the tire casing 20 at that point is sent to the control device 34. The winding head encoder 72 senses the actual surface velocity and, if it is not the same as the feed rate, the signal is transmitted to the DC motor 32 so that it is at the same rate, which provides fine tuning of the speed control. Be done. This is important if the surface velocity is greater than or less than the feed rate, which is undesirable because the tension in the strip 12 will change and a non-uniform strip will wind up on the tire casing 20.

So that the winding head 16 provides X and Y coordinates to move in the X and Y directions, and
It is mounted to provide the Z coordinate and adjust the angle. The rotation of the struts 36 is Z relative to the angular position of the winding head for each data point along the tread 84.
Provide the coordinates. Upper platform drive motor 5
6 moves the upper platform 38 in a direction that provides the X coordinate for the data point of each winding of strip 12. Lower platform drive motor 66
Is rotated to give the Y coordinate of the data points for each winding of strip 12.

To begin winding, the winding head 16 moves the X, Y shown in the data provided from the graphical representation of the tread 84.
And to the position of the first data point with the first wrap 78 having the Z coordinate. The extrusion machine is started, the tip of the strip 12 is a roller die,
Through the chiller and conveyor, past the roller 14 and toward the winding head 16 with the strip tip at the position of the first data point, an upstream encoder 74 senses the feed rate and the spindle encoder 30 and With the data from the Y-axis coordinates, the surface speed of the tire casing 20 is adjusted to match the feed speed of the strip 12 to the winding head 16. The upper platform drive motor 56 also causes the strip 12 data points to move from the first data point position shown in the first wrap 78 to the second data point position shown in FIG. Spindle 2
4 It works to move in the axial direction. Strip 12
When the first wrap of is placed on the surface 18 of the tire casing, the lower platform 50 changes the Y-axis coordinates for the first data point location 90 to the Y coordinates for the second data point location 92. Is moved by the lower platform drive motor for.
At the same time, the strut drive motor 44 serves to rotate the strut 36 to provide an angle corresponding to the Z coordinate with respect to the second data point 92. This movement of the winding head 16 causes the winding head 16 to traverse the tire casing 20 along the contour 76 of the tire carcass from one shoulder 94 to the other side while the tire casing 20 rotates a predetermined number of revolutions. Continued while moving to shoulder 96. The winding head 16 then causes the shoulder casing 9 at start-up so that the tire casing 20 lays the second layer 100 of turns of the strip 12 during a predetermined number of revolutions.
It is programmed to move in reverse in the direction of 4.
The winding head 16 has a desired outer tread profile 86.
Back and forth between shoulders 94 and 96 until During this time, the rotational speed of the tire casing 20 is uniformly fed to the winding head 16 without the strip being stretched, so as to avoid uneven distribution of the weight of the tread 84 around the tire casing.
Coordinate) and the feed rate of the strip 12 sensed by the upstream encoder 74. When the stack of treads 84 is completed, the rotation of the tire support wheels 22 is stopped by stopping the DC motor 32,
The strip 12 is separated. The winding head 16 is then separated from the tire casing 20 by actuating the motor 66 of the lower platform and the tire casing 20 is disengaged from the tire support wheel 22.

While certain representative embodiments and detailed descriptions have been set forth for the purpose of illustrating the invention, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or purpose of the invention. Ah

[Brief description of drawings]

1 shows the winding head in position for winding a strip of tread material around a tire casing mounted on a tire casing support wheel, line 1-1 of FIG.
FIG. 3 is a schematic elevational view of a strip winding device showing an embodiment of the present invention. FIG. 2 is a partial plan view of the device shown in FIG. 1 except a part of the tire casing and a tire supporting wheel. FIG. 3 is a schematic of the tire casing and tread about line 3-3 of FIG. 1, showing the coordinates and position of the winding head of the strip shown in phantom for the winding at different positions of the strip of material of the tread. FIG. 10: Winding device 12: Strip 14: Roller 16: Winding head 18: Tire casing surface 20: Tire casing 22: Tire support wheel 24: Spindle 26: Tire support stand 30, 72, 74: Encoder 34: Control device 36: Support 38: Upper platform 39: Axis 40: Ring gear 44: Support drive motor 50: Lower platform 56: Upper platform drive motor 66: Lower platform drive motor 70: Pressing member 84: Tread 85, 86: Contour 90: Position of first data point 92: Position of second data point 94, 96: Shoulder 100: Second layer C: Centroid of winding

Claims (4)

[Scope of utility model registration request] 1. A plurality of wraps of shaped strip of tread material on the surface of a rotatable tire casing, X
And a Y-coordinate to the exact predetermined position and place this strip on the surface of the tire casing.
A device for pressing at a predetermined angle defined by the Z coordinate with respect to the surface of a tire casing, the tire casing supporting wheel mounted so as to rotate about a spindle axis, and mounted on a winding head strut. And a winding head, the winding head post having a base rotatably mounted on an upper platform, the upper platform being adapted to move in a direction parallel to the spindle axis. Slidably mounted on the lower platform, the lower platform slidably mounted on a support surface in close proximity to and spaced from the spindle axis, and for rotating the winding head post. Strut driving means and pressing the strip against the surface of the tire casing at the predetermined angle Rotation control means for actuating the strut drive means to rotate the strut at a predetermined angle with respect to the plane of the tire casing; upper platform drive means for moving the upper platform on the lower platform; and a tread. Upper platform control means for actuating the upper platform drive means to move the upper platform to a predetermined axial position of the tire casing when the strip of material is wrapped around the surface of the tire casing; Lower platform drive means for moving the lower platform on the support surface, and the lower platform in a radial direction of the tire casing when the strip of tread material is wrapped around the surface of the tire casing. Lower platform control means for actuating the lower platform drive means to move to a predetermined position, spindle drive means for rotating the tire casing support wheels, and spindle drive means in response to a supply speed input. Spindle rotation control means operative to rotate the tire casing support wheel at a varying speed, and the tread material upstream of the winding head to detect the feed rate of the strip to the winding head. A tread material winding device for winding a tread material around a tire casing having a speed sensor engaged with a strip and a spindle rotation speed sensor attached to the spindle for detecting a rotation speed of the spindle. 2. The tread material winding device according to claim 1, wherein a direction of the winding head post from the base toward the winding head is generally inclined away from an axis of the spindle. 3. The tread material winding device according to claim 1, wherein the spindle rotation control means has a Y-coordinate input for changing the rotation speed of the tire casing support wheel when the Y-coordinate changes. 4. On the winding head for engaging the surface of the tire casing at the winding head to detect the actual surface speed as the strip is wound around the surface of the tire casing. The tread material wrapping apparatus of claim 1 including a wrapping surface speed sensor attached to the trolley and coupled to the spindle rotation control means for finely adjusting the rotation speed of the tire casing support wheel.