JP5513195B2 - Method and apparatus for drawing unvulcanized tires - Google Patents

Description

  The present invention relates to a method and an apparatus for drawing a line on an unvulcanized tire, and more specifically, a coating is applied to the outer peripheral surface of a tread portion of an unvulcanized tire disposed on the outer peripheral surface of a molding drum. A drawing method and apparatus for drawing a marker line extending in the circumferential direction of the tread part, in particular, even if irregularities due to the ribbon manufacturing method or the like occur on the outer peripheral surface of the tread portion, without causing wrinkles or unevenness. The present invention relates to a method and an apparatus for drawing an unvulcanized tire capable of drawing a mark line as expected.

  Conventionally, in order to make it easy to identify the type and size of a product tire, various colors have been applied to the outer peripheral surface of a member corresponding to the tread portion of an unvulcanized tire and varied according to the type and size of the tire. In addition, there is a method of facilitating identification by visual recognition after vulcanization by performing vulcanization after arranging one or more marker lines of thickness.

  In this regard, for example, in Patent Document 1, a sign line is attached to a long belt member that is moving, characterized in that paint is supplied to the application roller by a pump operated by a motor that is driven and controlled via a control device. According to this, “the paint supplied to the groove of the application roller is positively sent out by the pump, so that a constant amount of paint is always applied.” It can be supplied to the groove of the roller, so that an accurate and clear marking line can be formed, automatically by the pump in response to changes in the moving speed of the long strip member such as tread material or the viscosity of the paint. Since the amount of paint delivered can be adjusted, a constant, accurate and clear marker line can always be formed. "

  However, when the marker line is applied using the above apparatus, there is a possibility that unevenness due to curling or excessive paint occurs at both ends in the longitudinal direction of the long belt-like member.

  In recent years, as a method for molding an unvulcanized tire, a so-called ribbon manufacturing method in which a required tire constituent member is formed by winding a rolled fine ribbon-like rubber strip a plurality of times on the outer peripheral side of a molding drum has been widely used. Although being implemented, since this manufacturing method does not use a long strip member prepared in advance, the apparatus described in Patent Document 1 cannot be applied to this ribbon manufacturing method.

  Furthermore, there is a method of drawing a paint by rotating a coating roller on the outer peripheral surface of a tread portion of an unvulcanized tire on a molding drum. However, in the ribbon manufacturing method, the ribbon-shaped rubber strip is laminated and wound. As a result, unevenness is generated on the outer peripheral surface of the tread portion. Therefore, in a normal drawing method using a coating roller, the unevenness of the marker line is caused by the unevenness, and a precise marker line cannot be drawn.

  In addition, in an unvulcanized tire configured by such a ribbon manufacturing method, there is a gap between the winding layers of the laminated ribbon-like rubber strip. For example, an ink jet printer is used to apply the paint to the tread surface. When marking lines are applied by an ink spraying method for spraying or an ink dropping method for dropping a paint on the surface, the paint penetrates into the gap, and there is a risk that the appearance of the product tire after vulcanization is impaired.

JP-A-6-154680

  Therefore, in view of the above problems, the present invention can draw a sign line as expected without causing wrinkles or unevenness even when the outer peripheral surface of the tread portion is uneven, and unvulcanized. Even when the tread part of the tire is made by a ribbon manufacturing method, the paint does not penetrate into the gap between the winding layers of the rubber strip, and the quality of the product tire can be secured to a high degree. An object is to provide a drawing method and a drawing apparatus.

The gist configuration of the present invention for solving the above problems is as follows.
In the drawing method for the unvulcanized tire according to the present invention, the coating direction is applied to the outer peripheral surface of the tread portion of the unvulcanized tire, which is arranged on the outer peripheral surface of the molding drum. A method of drawing a non-vulcanized tire that draws a marker line extending to
A stitching roller that can be rotated about an axis parallel to the rotation axis of the molding drum, can be displaced in the axial direction of the molding drum, and in a direction toward and away from the molding drum; The stitching roller is pressed against at least the marked line drawing position of the uncured tire and rolled to smooth the drawn line position; axially, and with a displaceable drawn line means in a direction toward and away with respect to molded drum, paint is applied to該描line position,-out drawing the marking lines,
The drawing means includes a paint tray for temporarily storing paint during drawing, a paint tank for supplying paint under pressure to the paint dish via a conduit, and a remaining amount of paint in the paint dish And a sensor for controlling the supply of the paint to the paint tray,
After applying a paint to the tread portion of the unvulcanized tire, the paint remaining in the paint tray is returned to the paint tank by negative pressure suction .

  Here, the “drawing unit” includes an ink jet printer, an ink dropping type drawing unit, and the like in addition to a so-called roller type drawing unit that rolls an application roller to apply a paint.

  Preferably, at least a tread portion of the unvulcanized tire is molded by a ribbon manufacturing method in which a rubber strip having a ribbon shape is wound a plurality of times, and the outer peripheral surface of the tread portion. Draw a sign line on.

  In the place described in claim 1 or 2, preferably, the plurality of stitching means that can be independently displaced are used to simultaneously smooth the positions of the drawn lines in the tread portion of the unvulcanized tire. .

  The place according to any one of claims 1 to 3, preferably, a plurality of the drawing means that can be independently displaced, and simultaneously marked at a plurality of drawing positions of a tread portion of the unvulcanized tire. Draw a line.

  Preferably, each marker line having a different color is drawn by each drawing means.

Further, the device for drawing a line on an unvulcanized tire of the present invention applies a paint to the outer peripheral surface of the tread portion of the unvulcanized tire, which is disposed on the outer peripheral surface of the molding drum. A drawing device for an unvulcanized tire that draws a marker line extending in the circumferential direction,
A stitching roller that can be rotated about an axis parallel to the rotation axis of the molding drum, can be displaced in the axial direction of the molding drum, and in a direction toward and away from the molding drum; Stitching means that presses and rolls the stitching roller against at least the marked line drawing position of the unvulcanized tire, thereby smoothing the drawn line position, and the axis of the molding drum A line-drawing means displaceable in a direction and a direction approaching and moving away from the molding drum ,
The drawing means includes a paint tray for temporarily storing paint during drawing, a paint tank for supplying paint under pressure to the paint dish via a conduit, and a remaining amount of paint in the paint dish And a sensor for controlling the supply of the paint to the paint tray,
After applying the paint to the tread portion of the unvulcanized tire, the paint remaining in the paint tray can be returned to the paint tank by negative pressure suction .

  Here, the “drawing device” refers to a device that can draw a line at a predetermined position of an object by applying paint.

  In the method for drawing an unvulcanized tire according to the present invention, since the drawing position is smoothed by the stitching roller, the unevenness on the outer peripheral surface of the tread portion is eliminated, and the mark line is drawn at the drawing line position. It prevents line blurring and unevenness and allows you to draw precise sign lines as expected.

  In addition, when this drawing method is applied to an unvulcanized tire in which at least the tread portion is molded by a ribbon manufacturing method, the stitching roller leveles the irregularities on the outer peripheral surface of the rubber strip, and the gap between the winding layers is increased. Since it is buried to prevent the penetration of the paint, excellent quality of the product tire after vulcanization can be ensured.

  Furthermore, in the method for drawing unvulcanized tires according to the present invention, a plurality of stitching means that can be independently displaced are used to simultaneously smooth the drawing positions at a plurality of locations, and more preferably, each is independently displaced. By using a plurality of possible line drawing means and simultaneously drawing marker lines at a plurality of line drawing positions, it is possible to shorten the work time and improve the productivity.

  In addition, when a plurality of drawing means are used as described above, it is easy to identify tires variously by combinations of colors or the like by drawing each marker line having a different color with each drawing means. .

  In addition, in the method for drawing uncured tires according to the present invention, when the remaining amount of paint is detected by a sensor and the supply of paint from the tank is controlled, an appropriate amount of paint is always supplied and the paint overflows, etc. In addition, when applying the paint to the tread part of the unvulcanized tire and returning the remaining surplus paint to the paint tank by negative pressure suction, the paint is prevented from being dried. It is possible to prevent malfunction of the application roller or the like.

  By using the drawing device for the unvulcanized tire of the present invention, the above method can be performed more easily. In that case, if this drawing apparatus is provided with, for example, a plurality of stitching means and a plurality of drawing means, the cycle time can be shortened.

  Further, in the drawing apparatus for an unvulcanized tire of the present invention, the drawing means supplies the paint under pressure through a conduit into the paint tray for temporarily storing the paint during the drawing and the paint tray. A paint tank and a sensor for detecting the remaining amount of paint in the paint tray and controlling the supply of the paint to the paint tray. The paint is applied to the tread portion of the unvulcanized tire. After that, if the paint remaining in the paint dish can be returned to the paint tank by negative pressure suction, the paint remaining in the paint dish after drawing is returned to the paint tank, so that the paint can be dried. It is possible to prevent malfunction of the application roller due to drying.

In the drawing method to the unvulcanized tire of this invention, it is a perspective view which shows typically a shaping | molding drum, an unvulcanized tire, and a stitching means at the time of smoothing a drawing position. In the drawing method to the unvulcanized tire of this invention, it is a perspective view which shows typically the drawing unit provided with the shaping | molding drum, the unvulcanized tire, and several drawing means at the time of apply | coating a coating material. FIG. 3 is an enlarged perspective view schematically showing one of the drawn line units in FIG. 2. It is a figure which shows typically the example of arrangement | positioning of the line drawing means, the paint tank connected to this line drawing means, and the air pressure control means connected to this paint tank.

Hereinafter, the present invention will be described in detail with reference to the drawings.
In FIG. 1, two stitching means 5 a having different heights are pressed against the outer peripheral surface of the tread portion 2 of the unvulcanized tire 1 disposed on the outer peripheral surface of the molding drum D and roll. 5b is shown.

  The respective stitching means 5a and 5b can be displaced in the axial direction of the molding drum D on the rails 20a and 20b, and can be displaced in the direction approaching and separating from the molding drum D by the arms 21a and 21b. It has stitching rollers 4a and 4b, respectively.

  The stitching rollers 4a and 4b can each be temperature-controlled, and roll on the marking lines 6a and 6b of the uncured tire 1 while being heated to a predetermined temperature. And 6b are smoothed, so-called stitching processing is performed.

  By this stitching process, the unevenness on the outer peripheral surface of the tread portion 2 of the unvulcanized tire 1 is leveled. Further, when the unvulcanized tire 1 is constituted by a ribbon manufacturing method, Since the gap between the winding layers is sufficiently filled, a desired marker line can be easily drawn.

  In the illustrated example, these stitching means 5a and 5b can be independently displaced, and a plurality of (two in the illustrated example) drawn positions 6a and 6b of the tread portion 2 of the unvulcanized tire 1 are provided. It can be smoothed at the same time.

  FIG. 2 shows a drawing line comprising line drawing means 7a to 7c for applying paint on the drawing line positions 6a and 6b smoothed by the stitching means 5a and 5b to draw the marking lines 3a and 3b, respectively. Each of the unit 18a and the drawing unit 18b including the drawing units 7d to 7f is shown.

  In addition, each drawing unit 18a and 18b is arrange | positioned mutually changing height, and it can respectively be displaced independently in the axial direction of the rotating shaft A of the forming drum D, respectively.

The drawing unit 18a includes a table 23 that can be displaced in the axial direction of the forming drum D and a direction perpendicular to the axis of the forming drum D on the table 23, as shown in FIG. Three small rails 22a to 22c arranged to extend to each other, and three drawing means that can be independently displaced on the small rails 22a to 22c in the directions approaching and separating from the molding drum D. It is comprised by 7a-7c.
The other drawing unit 18b (not shown) has the same configuration as the one drawing unit 18a.

  In FIG. 2, the drawing means 7 c protrudes from the drawing unit 18 a toward the unvulcanized tire 1, and the drawing means 7 e protrudes from the drawing unit 18 b, and the marking lines 3 b are on the drawing positions 6 b and 6 a, respectively. And 3a are drawn simultaneously.

  Thus, in the method for drawing an unvulcanized tire according to the present invention, for example, a plurality of drawing units are provided in the vertical direction, and a plurality of drawing units that can be independently displaced are used, and one drawing means is provided from each unit. By projecting, a plurality of marker lines can be applied simultaneously to different drawn positions.

Further, at that time, it is possible to simultaneously draw the respective marking lines having different colors by the respective drawing means, whereby it is possible to distinguish the tires by a large number of coloring patterns.
For example, according to the example of FIG. 2, two different color lines can be drawn simultaneously.

  In FIG. 4 schematically illustrating a drawing means 7 and the like suitable for use in the drawing method for an unvulcanized tire of the present invention, the drawing means 7 is a paint for temporarily storing the paint 11 during the drawing. The tray 8, the paint tank 12 for supplying paint into the paint tray 8 through the conduit 13, and the remaining amount of paint in the paint tray 8 are detected to control the supply of the paint 11 to the paint tray 8. And a sensor 9 for outputting a signal for performing the above operation.

  Here, the paint tank 12 is further connected to the switching valve 15 via another conduit 14. Under the action of the switching valve 15, the paint tank 12 is pressurized or depressurized, The supply of the paint 11 to the paint tray 8 is controlled.

  In the drawing means 7 shown in the figure, the paint 11 in the paint tray 8 is scraped up by a lifting roller 16, and further on the outer peripheral surface of the forming drum D via an application roller 17 that contacts the lifting roller 16. It is applied to the tread portion of the unvulcanized tire 1 disposed on the tire.

  If such a drawing means 7 is applied to the drawing method for the unvulcanized tire of the present invention, after the drawing to the unvulcanized tire 1 is completed, the surplus paint 11 remaining in the paint tray 8 is obtained. Under the action of the switching valve 15, negative pressure can be sucked back into the paint tank 12.

  According to the configuration shown in FIG. 1, a device dedicated to stitching was produced, which includes two stitching means 5a and 5b that can be displaced independently of each other. This makes it possible to simultaneously stitch two drawn line positions 6a and 6b for drawing a marker line.

  Next, according to the structure shown in FIG. 2, the apparatus only for the drawing which provided the 6 drawing means 7a-7f which can be displaced independently was manufactured. As a result, it becomes possible to draw six colored marker lines and simultaneously apply two different colored marker lines to designated positions.

  Here, the six line drawing means 7a to 7f provided in the apparatus dedicated to the line drawing are manufactured according to the configuration shown in FIG. In the drawing device 7 shown in FIG. 4, the paint in the paint tank 12 is supplied to the paint tray 8 via the conduit 13 by air pressure feeding. Further, when the liquid level of the paint 11 in the paint tray 8 rises to a predetermined height and comes into contact with the tip of the sensor 9, the sensor 9 reacts and the switching valve 15 is switched, so that the pumping of the paint 11 is stopped. Is done.

Using these manufactured devices, the drawing method for the unvulcanized tire of the present invention was carried out.
The process flow will be described below.

(1) First, as shown in FIG. 1, the unvulcanized tire 1 is arranged on the outer peripheral surface of the forming drum D and rotated, and the stitching arranged on different axes using the above-described apparatus dedicated to stitching. After the means 5a and 5b are applied to the predetermined drawing positions 6a and 6b of the unvulcanized tire 1, the unvulcanized tire 1 is rolled to perform stitching processing over the entire circumference of the tire. 6a and 6b were smoothed.

(2) Next, in accordance with what is shown in FIG. 2, any two of the drawing means 7a to 7f (illustrated example) are placed on the drawing positions 6a and 6b subjected to the stitching process using the apparatus dedicated to the drawing. Then, after applying the application roller 17 of 7c and 7e), the unvulcanized tire 1 is rolled, the paint is applied over the entire circumference of the tire, and the marking lines 3a and 3b are placed on the drawing positions 6a and 6b. Painted.

(3) After the predetermined drawing on the unvulcanized tire 1 is completed, the switching valve 15 is switched to suction to prevent the paint 11 remaining in the paint tray 8 from drying, and the paint tray 8 The operation of collecting the remaining paint 11 in the paint tank 12 by flowing back into the paint tank 12 by air suction was performed.

  In addition, the Example shown above exemplarily shows one aspect of the drawing method for the unvulcanized tire of the present invention, and does not limit the present invention. That is, the method for drawing an unvulcanized tire of the present invention can be carried out in various modes other than the steps of the above-exemplified examples.

D Forming drum 1 Unvulcanized tire 2 Tread portions 3a, 3b Marking lines 4a, 4b Stitching rollers 5a, 5b Stitching means 6a, 6b Drawing positions 7a-7f Drawing means 8 Paint tray 9 Sensor 11 Paint 12 Paint tank 13 Conduit 14 Conduit 15 Switching valve 16 Raising roller 17 Coating roller 18a, 18b Drawing unit 19 Case 20a, 20b Rail 21a, 21b Arm 22a-22c Small rail 23 Table

Claims (6)

Drawing on the unvulcanized tire, which draws a marker line extending in the circumferential direction of the unvulcanized tire by applying paint to the outer circumferential surface of the tread portion of the unvulcanized tire, which is arranged on the outer peripheral surface of the molding drum A method,
A stitching roller that can be rotated about an axis parallel to the rotation axis of the molding drum, can be displaced in the axial direction of the molding drum, and in a direction toward and away from the molding drum; The stitching roller is pressed against at least the marked line drawing position of the uncured tire and rolled to smooth the drawn line position; axially, and with a displaceable drawn line means in a direction toward and away with respect to molded drum, paint is applied to該描line position,-out drawing the marking lines,
The drawing means includes a paint tray for temporarily storing paint during drawing, a paint tank for supplying paint under pressure to the paint dish via a conduit, and a remaining amount of paint in the paint dish And a sensor for controlling the supply of the paint to the paint tray,
A method for drawing an unvulcanized tire , comprising: applying a paint to a tread portion of the unvulcanized tire and then returning the paint remaining in the paint tray to the paint tank by negative pressure suction .   The at least tread portion of the unvulcanized tire is formed by a ribbon manufacturing method in which a rubber strip having a ribbon shape is wound a plurality of times, and a marker line is drawn on the outer peripheral surface of the tread portion. The drawing method to the unvulcanized tire of 1.   The undrawn position according to claim 1 or 2, wherein a plurality of the stitching means that can be independently displaced are used to simultaneously smooth the positions of the drawn lines in the tread portion of the unvulcanized tire. Drawing method for vulcanized tires.   The marker lines are simultaneously drawn at a plurality of drawn positions of the tread portion of the unvulcanized tire by using a plurality of the drawn means that can be displaced independently of each other. The drawing method to the unvulcanized tire of description.   5. The method of drawing an unvulcanized tire according to claim 4, wherein each of the marking lines having different colors is drawn by each of the drawing means. Drawing on the unvulcanized tire, which draws a marker line extending in the circumferential direction of the unvulcanized tire by applying paint to the outer circumferential surface of the tread portion of the unvulcanized tire, which is arranged on the outer peripheral surface of the molding drum A device,
A stitching roller that can be rotated about an axis parallel to the rotation axis of the molding drum, can be displaced in the axial direction of the molding drum, and in a direction toward and away from the molding drum; Stitching means that presses and rolls the stitching roller against at least the marked line drawing position of the unvulcanized tire, thereby smoothing the drawn line position, and the axis of the molding drum A line-drawing means displaceable in a direction and a direction approaching and moving away from the molding drum ,
The drawing means includes a paint tray for temporarily storing paint during drawing, a paint tank for supplying paint under pressure to the paint dish via a conduit, and a remaining amount of paint in the paint dish And a sensor for controlling the supply of the paint to the paint tray,
An unvulcanized tire characterized in that, after applying a paint to the tread portion of the unvulcanized tire, the paint remaining in the paint tray can be returned to the paint tank by negative pressure suction . Drawing device.

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