JP2006247878A - Method for pasting ribbon-like strip on drum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify both of the operation control and operation mechanism of a pasting head by enabling the expected winding pasting of a ribbon-like strip only by subjecting the pasting head to linear motion in the direction becoming parallel to the center axial line of a drum and to facilitate the confirmation, adjustment or the like of control. <P>SOLUTION: In pasting the ribbon-like strip 4 delivered from the pasting head 5 around the drum 1 having a curved line part 3 in its outer contour shape on the basis of the relative displacement of the pasting head 5 with respect to the rotating drum 1, the pasting head 5 is allowed to advance side by side in the direction becoming parallel to the center axial line CL of the drum 1 to paste the ribbon-like strip 4 on the peripheral surface of the drum 1 at an equal pitch within the required region in the axial line direction of the drum 1 over the whole also including the curved line part 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, for example, on a rigid drum having an outer surface shape corresponding to the inner surface shape of a product tire, a ribbon strip having a constant width is wound in a spiral or the like and adhered thereto, and a predetermined tire constituent member is provided there. In particular, the present invention relates to a method for applying a ribbon-like strip onto a drum, which is suitable for molding, and in particular, by simplifying the required movement pattern of the application head for feeding and applying the ribbon-like strip. The present invention proposes a technique that greatly simplifies both the operation control and operation mechanism of the pasting head.

  A ribbon-like strip having a width of about 5 to 20 mm, which may include a plurality of reinforcing cords, around a rigid drum having a curved portion in the outer contour shape, is directly or indirectly formed by an application head. In order to form a predetermined tire constituent member on the drum by spirally winding it on the drum, for example, as shown in a schematic perspective view in FIG. The affixing head H is driven forward and backward in the X-axis direction parallel to the central axis CL of the drum Dr with respect to the rigid drum Dr that is rotationally driven, and also in the Y-axis direction orthogonal to the X-axis direction in the horizontal plane. The ribbon-shaped strip St can be driven with no gap between each other under the required pasting accuracy by driving forward and backward, and by swinging and displacing around the θ axis orthogonal to the XY plane in the horizontal plane. Or, it is proposed to wind under the overlap of a portion of a predetermined amount of width.

  However, in this proposed technique, the tip of the pasting head H is moved along the outer contour shape with a small clearance of about several centimeters, for example, with respect to the drum Dr having a curved portion in the outer contour shape. At the same time, since the sticking head H is moved by controlling the posture so that the sticking head H is oriented in the normal direction with respect to the outer contour line of the drum Dr, a predetermined movement of the sticking head H is realized. Therefore, it is necessary to control the movement of the head H with respect to each of the X axis, the Y axis, and the θ axis in synchronization with the rotation of the drum Dr, and the control becomes complicated. At the same time, there is a problem that it is difficult to check and adjust the control. On the other hand, the operation mechanism of the sticking head H becomes inevitable, and maintenance becomes difficult and cost increases. There is also a problem to say.

  The present invention has been made to solve such problems of the proposed technology, and the object of the invention is to linearly move the sticking head in a direction parallel to the central axis of the drum. By simply making it possible, the ribbon-shaped strip can be wound and affixed to the drum circumference as expected, thereby simplifying and controlling both the operation control and operation mechanism of the application head. It is an object of the present invention to provide a method for sticking a ribbon-like strip on a drum, which can be easily confirmed and adjusted without increasing maintenance costs and increasing equipment costs.

  According to the present invention, a ribbon-like strip affixing method on a drum includes a ribbon-like strip having a constant width within a range of, for example, about 5 to 20 mm, which is fed out from an affixing head and includes or does not include a reinforcing cord. When applying directly or indirectly around a rigid drum, with a curved portion in the outer contour shape, based on the relative displacement of the application head relative to the rotating drum, the center axis of the drum is applied to the application head. The ribbon-like strip is placed on the drum circumferential surface within the required region in the drum axial direction, including only the curved portion, for example, in a direction parallel to the drum. In this case, the same pitch is applied within an allowable pitch accuracy of about ± 0.5 mm.

Preferably, in this method, the curved portion of the outer contour shape is approximated by an arbitrary straight line, and the arrangement pitch of the ribbon-shaped strip on the approximate straight line portion becomes equal to the arrangement pitch on the non-curved portion. Thus, for example, they are attached so as to be equal within an allowable pitch accuracy.
In this case, it is preferable to approximate the entire curved portion having a constant radius of curvature with a single straight line.

By the way, when affixing the ribbon-shaped strip at a predetermined pitch as described above, the movement speed of the affixing head is determined at a location corresponding to the curved portion of the drum and from a speed corresponding to the non-curved portion. It is preferable to slow down.
In this case, the required arrangement pitch of the ribbon-like strip on the approximate straight line portion and the non-curved portion is projected onto a straight line parallel to the central axis of the drum, and the ribbon strip is pasted on the portion where the projected pitch is small. The movement speed of the head is made slower than the speed at the portion where the projection pitch is large in proportion to the projection pitch.

  In the application method according to the present invention, in direct or indirect application of the ribbon-like strip around the drum, the application to the application head in a direction parallel to the central axis of the application is performed under the rotation of the drum. By performing only the translational movement, complicated calculation for the operation control of the sticking head is not required, and both the operation control itself and the operation mechanism are sufficiently simple. It is possible to easily check and adjust the control without causing difficulty and an increase in equipment cost.

  Here, the curved portion of the outer contour shape of the drum is approximated by an arbitrary straight line, and the arrangement pitch of the ribbon-shaped strip on the approximate straight line portion is equal to the arrangement pitch on the non-curved portion. When moving the sticking head, the operation control of the sticking head can be made simpler than when the ribbon-like strip is directly arranged at a predetermined pitch on a curved portion having an arc shape or the like. Along with this, the ribbon-like strips can be arranged at the required pitch within an acceptable pitch accuracy.

  This operation control can be made particularly simple when the entire curve portion having a constant curve radius is approximated by a single straight line. However, in this case, if the length of the approximate straight line portion that forms a string shape or the like becomes longer, the arrangement pitch accuracy of the ribbon-like strip will inevitably decrease, so that the arrangement pitch accuracy falls within the allowable range. When it disappears, it is more preferable to approximate the entire curved portion by a plurality of straight lines.

  By the way, winding the ribbon-shaped strip around the drum at a predetermined uniform pitch is performed by adjusting the translational movement speed of the application head at a location corresponding to the curved portion of the drum and a location corresponding to the non-curved portion. It is possible to appropriately carry out by making the winding density at the curved portion slower than the speed of the above.

  More specifically, this is achieved by projecting the required pitch of the ribbon-shaped strip on the approximate straight line portion and the non-curved portion onto a straight line parallel to the central axis of the drum. This can be easily realized by slowing the movement speed of the sticking head at the small pitch portion in proportion to the projection pitch as compared with the speed at the large projection pitch portion.

FIG. 1 is a perspective view illustrating an embodiment of a method according to the present invention.
In the figure, reference numeral 1 denotes a decomposable rigid drum formed by, for example, combining a plurality of arcuate segments in an annular shape in the circumferential direction. This drum 1 corresponds to, for example, the inner shape of a product tire. It has an outer shape.

  Thus, the peripheral surface 2 of the crown region of the drum 1 has an outer contour shape in a plan view, a front view, and other outer contours in a drum posture with the central axis CL of the drum 1 being horizontal. It has a curved portion 3 over the entire circumference.

  Such a drum 1 can be driven to rotate in a required direction at a required speed around the central axis CL, while a ribbon-like strip 4 having a constant width in the range of, for example, 5 to 20 mm is drummed. 1 and a sticking head 5 for directly or indirectly winding and adhering the strip 4 to the peripheral surface 2 of the drum 1 under the action of a linear motion guide 6 and a screw mechanism 7, for example. The drum 1 is configured to be translationally driven in a direction parallel to the central axis CL of the drum 1.

  When the ribbon-like strip 4 having a certain width, which may include a reinforcing cord, is wound and stuck under the rotation of the drum 1 on the curved portion 3 of the drum 1, the sticking head 5 is used. If, in other words, the application pitch of the strip 4 is equal to the strip width, for example, the distance between the strips 4 attached to the curved portion 3 becomes larger than that of the other portion, and the ribbon If the strip 4 is applied in a desired manner, for example, when it is overlapped by a part of its width direction, it is attached at its curved portion 3 regardless of whether it is in contact with each other at its side edges. Since the pitch accuracy of the pitch exceeds the allowable limit, in order to wind the ribbon-like strip 4 on the curved portion 3 with the required pitch accuracy, the curved portion It is necessary to make the affixing pitch in the case smaller than the affixing pitch in the non-curved portion, and according to this, the ribbon-like strip 4 is placed on the peripheral surface 2 of the drum 1 within a required region in the drum axial direction. In addition, the entire portion including the curved portion 3 can be attached at an equal pitch within an allowable pitch accuracy.

  By the way, when the ribbon-like strip 4 is adhered to the curved portion 3 and the non-curved portion of the drum 1 at such an equal pitch, the outer contour shape is enlarged in FIG. As shown, the curved portion 3 thereof is approximated by an imaginary arbitrary straight line, and the ribbon-like strip 4 is arranged on the non-curved portion 10 so that the arrangement pitch p on the approximate linear portions 8 and 9 is It is preferable to control the movement of the affixing head 5 so as to be equal to the arrangement pitch p in this case. In this case, the virtual arbitrary straight line does not become too far away from the curved portion 3 or becomes too long. As long as the entire curved portion having a constant radius of curvature is a single straight line, it is preferable to simplify the operation control of the sticking head 5.

  Further, the ribbon-like strip 4 is adhered to the drum curved portion 3 and the non-curved portion 10 at an equal pitch without differentiating the translational movement speed of the pasting head 5 at a position corresponding to the curved portion 3 of the drum 1. It can also be realized simply by making it slower than the translational motion speed at the portion corresponding to the non-curved portion 10.

  In this case, the movement speed of the affixing head 5 is, for example, as shown in FIG. 3, the required arrangement pitch of the ribbon-like strip 4 on each of the approximate straight portions 8 and 9 and the non-curved portion 10. p is projected onto a straight line 11 parallel to the central axis CL of the drum 1, and the speed at a portion with a small projection pitch is adjusted to be slower than the speed at a portion with a large projection pitch. Can be controlled on the street.

  As described above, the ribbon-shaped strip 4 is placed on the peripheral surface 2 of the drum 1 at a predetermined pitch by causing the affixing head 5 to perform only a translational movement in a direction parallel to the central axis CL of the drum 1. When winding and sticking as expected, the required sticking accuracy of the ribbon-shaped strip is sufficient compared to the case where the movement of the sticking head is controlled with respect to three axes as described in the prior art. The number of positioning programs for the pasting head 5 can be reduced to about 1/8 and the part cost can be reduced to about 1/3.

When a ribbon-like strip having a width of 6.2 mm is wound and laminated in a plurality of layers at a set pitch of 6.6 mm and a set clearance of 0.4 mm on the peripheral surface of a drum having a curved outline as a whole of the crown castle In Fig. 4, when the winding errors of the first layer and the second layer wound according to the present invention were measured, the results shown in Figs. 4 and 5 were obtained.
Here, the allowable upper limit value of the clearance is 0.9 mm, and the allowable lower limit value is 0.0 mm.

FIG. 4 (a) relates to each winding layer of the first layer, in the front view of the drum, with respect to the left part from the crown center, and FIG. 4 (b), with respect to the right part from the crown center. Each measurement result and evaluation result are shown. FIG. 5 (a) shows the left side portion from the crown center, and FIG. 5 (b) shows the right side from the crown center. Each measurement result and evaluation result about a part are shown.
By the way, “AVE” in each table indicates an average value of clearance, “σ” indicates a standard deviation, and “3σ” indicates a worst-case value on the assumption.

  4 and 5, according to the actual measurement, although the evaluation exceeding the lower limit of the clearance is observed in the first time of FIG. 4B and the second time of FIG. 5B according to the method of the present invention. It can be seen that a high winding accuracy within ± 0.3 mm can be realized.

It is a perspective view which illustrates embodiment of the method concerning this invention. It is a partial expansion perspective view of an outline line showing an approximate straight line part. It is a projection figure of the required arrangement | positioning pitch of a ribbon-shaped strip. It is a graph and a table | surface which show the implementation result of the method of this invention. It is a graph and a table | surface which show the implementation result of the method of this invention. It is a basic-line perspective view which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drum 2 Circumferential surface 3 Curved part 4 Ribbon-shaped strip 5 Pasting head 6 Linear guide 7 Screw mechanism 8, 9 Approximate linear part 10 Non-curved part 11 Straight line CL Central axis p Arrangement pitch

Claims (5)

When the ribbon-shaped strip fed out from the pasting head is pasted around a drum having a curved portion in the outer contour shape based on the relative displacement of the pasting head with respect to the rotating drum,
By causing the application head to translate only in the direction parallel to the central axis of the drum, the ribbon-shaped strip is included on the peripheral surface of the drum within the required region in the axial direction of the drum. A method of applying a ribbon-like strip on a drum, which is applied at an equal pitch throughout.   The curved portion of the outer contour shape is approximated by an arbitrary straight line, and the ribbon-like strip is attached so that the arrangement pitch on the approximate straight line portion is equal to the arrangement pitch on the non-curved portion. Item 2. A method for attaching a ribbon-like strip on a drum according to item 1.   The method for attaching a ribbon-like strip on a drum according to claim 2, wherein the entire curved portion having a constant radius of curvature is approximated by a single straight line.   4. The application of the ribbon-like strip on the drum according to claim 1, wherein the movement speed of the application head is made slower than the speed at the part corresponding to the non-curved part at the part corresponding to the curved part of the drum. Method.   The required disposition pitch of the ribbon-shaped strip on the approximate straight line part and the non-curved part is photographed on a straight line parallel to the central axis of the drum, and the movement speed of the sticking head at the small projection pitch part The method of sticking the ribbon-like strip on the drum according to claim 4, wherein the speed is made slower than the speed at the portion where the projection pitch is large.

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