JP2006322893A - Length control method for strip-like rubber member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress waste generation to the minimum, by preventing sufficiently a strip-like rubber member with a length dimension exceeding an allowance range from being supplied to a drum, and by preventing preliminarily the rubber member from being used unexpectedly, and to eliminate a risk of worsening tire quality. <P>SOLUTION: When the unvalcanized strip-like rubber member 5 cut into a prescribed length is moved linearly along a longitudinal direction thereof by a conveying means 2 to be bonded onto a circumferential face of the drum 1, the length of the strip-like rubber member 5 under the conveyance on the conveying means 2 is measured by a sensor 6, which is provided relating to the conveying means 2, on basis of detecting respectively a passed-through tip and a rear end of the rubber member 5, and the conveying means 2 is stopped when a measured length exceeds the allowance range of the strip-like rubber member 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes an inner liner member as a constituent member of a raw tire obtained by superposing and joining unvulcanized strip-shaped rubber members having a predetermined width at the side edge portions, which may include a cord and other reinforcing members. In particular, the present invention relates to a strip rubber member length management method suitable for use in forming carcass ply members, belt members, and the like. In particular, rubber members whose dimensional errors in length dimensions exceed an allowable range are overlapped. A technique for effectively preventing joining is proposed.

  For example, an unvulcanized strip-shaped rubber member having a constant width not including a reinforcing member is attached to the peripheral surface of the constituent member transfer drum in an extending posture in the axial direction of the drum, and a plurality of rubber members It has been proposed to form an inner liner member by overlapping and joining each other over a circumferential length corresponding to the circumference of one raw tire, and in forming such an inner liner member, A strip-shaped rubber member that has been fed from a winding roll and cut to a predetermined length, or formed by an extrusion molding machine and cut to a predetermined length, is moved in the length direction by a conveying means. It is transported in a straight line and brought in the vicinity of the component transfer drum, and the rubber member is transferred by the action of the conveying means itself or by a pasting means provided separately from the conveying means. On the circumferential surface of the ram, thereby attaching is performed in the extending position to its axial direction.

  The inner liner member thus formed on the component transfer drum is then transferred over the entire circumference on the peripheral surface of the tire molding drum and used for molding a raw tire as a tire component.

  By the way, conventionally, when the inner liner member is formed on the transfer drum as described above, the length of the strip-shaped rubber member is confirmed by manual measurement of the worker at the time of in-process, As long as raw tires of the same size are continuously molded, confirmation of the length of the rubber member is not performed.

However, the length of the strip-shaped rubber member to be cut to a predetermined length is due to accumulation of errors in the cutting device, slipping of the rubber member, contraction of the rubber member, input error to the cutting device, etc. If the rubber member does not include a reinforcing member, it may be longer or shorter than the allowable range for the specified dimension. The length dimension may vary due to the action of tension, compression force, etc. during subsequent transfer.
And when a raw tire was molded using such a strip-shaped rubber member whose length dimension is excessive or insufficient, there was a problem that the quality of the product tire could not be reduced.

  The present invention has been made in order to solve such problems, and its object is to supply a strip-shaped rubber member having a length exceeding an allowable range to a drum, As a result, a length management method of the strip-shaped rubber member that can sufficiently prevent the unexpected use of the rubber member in advance and suppress the generated waste as much as possible and effectively eliminate the possibility of deterioration of the tire quality. In offer.

  The length management method of the strip-shaped rubber member according to the present invention is, for example, an unvulcanized strip having a constant width that is fed from a winding roll or formed by an extrusion molding machine and cut to a predetermined length. When the rubber member is linearly transferred in the length direction by the conveying means and adhered to the peripheral surface of the drum, the length of the strip-shaped rubber member being transferred on the conveying means is transferred to the conveying means. Measured based on detecting the passage of the front and rear ends of the rubber member with a sensor provided in association, and the measured length is an allowable value for the predetermined value of the length of the strip-shaped rubber member For example, when the range of ± 10 to 20% of the predetermined value is exceeded, the conveying means is stopped, and preferably, a warning or the like is generated in conjunction therewith, and the strip-shaped rubber member is stuck on the drum peripheral surface. This is to prevent sticking in advance.

  Preferably, the strip-shaped rubber is based on the amount of movement of the conveying means from the detection of the passage of the front end of the strip-shaped rubber member by a sensor provided with a fixed position to the detection of the rear end thereof. Calculate the length of the member.

Preferably, the sensor is also used as a positioning sensor for detecting the arrival of at least one of the advancing limit position and the retreating limit position of the conveying means that moves forward and backward within a predetermined range.
By the way, it is preferable to use a laser displacement meter as the sensor.

  In addition, the drum here is a tire molding drum or component transfer used for forming a component of a raw tire by superposing and joining each of a plurality of strip-shaped rubber members at the side edges on the peripheral surface thereof. It can be a drum.

  According to the present invention, not only the length of the rubber member at the time of in-process, but also the length measurement of all the strip-shaped rubber members stuck on the drum circumferential length is automatically performed according to the action of the sensor. If the measurement result exceeds the allowable length, the transfer of the strip-shaped rubber member is stopped when the transport means is stopped. It is possible to easily check the length of the total number of strip-shaped rubber members without increasing the burden on the drum. In addition, unintentional rubber members with dimensions exceeding the allowable length are not intended on the drum surface. Adhesion can be sufficiently prevented.

  Therefore, here, by removing the strip-shaped rubber member that does not satisfy the dimensional requirements for the length from the formation line of the tire constituent member, it is possible to effectively prevent the quality of the product tire from being reduced. Waste can be minimized.

  In this case, the length of the strip-shaped rubber member is determined by, for example, the sensor detecting the passage of the front end of the rubber member under the action of a servo motor that causes the reciprocating motion of the conveying means. By calculating based on the amount of movement of the conveying means until the passage is detected, the length can be measured easily and quickly with a required accuracy under a simple apparatus structure.

  Here, when the sensor is also used as a sensor for positioning the conveying means, there is an advantage in equipment that a special sensor is not required to be installed, and for example, conveying means output from a servo drive system. The position signal can also be used for measuring the length of the rubber member.

  Here, as a sensor for detecting the passage of the front and rear ends of the strip-shaped rubber member, a laser displacement meter, for example, a focused light beam is projected onto an object to be measured, and a light beam reflected therefrom is received. By using an optical displacement detector that measures the change in the distance to the object to be measured, the rubber member is not affected by fluctuations in the reflectance of the surface of the strip rubber member, and the vibration of the rubber member during transfer, etc. The edge of the rubber member can be accurately detected without being affected by the above.

  By the way, in the present invention, when the drum is a tire molding drum, the transfer step of the raw tire constituent member formed on the drum can be made unnecessary, and the constituent member has a sufficiently large outer diameter. When used as a transfer drum, regardless of the size of the green tire to be molded, the required tire components must always be formed in the same manner on the same transfer drum, although there are differences in the number of sheets to be applied. Can do.

  FIG. 1 is a schematic perspective view illustrating a strip rubber member sticking device that can be used in the practice of the present invention. In FIG. 1, reference numeral 1 denotes a transfer drum for a tire constituent member having a sufficiently large outer diameter. 2 is a strip-shaped rubber member conveying means that forms a flat plate as a whole and performs a linear reciprocating motion within a predetermined range, and 3 is a predetermined length that is cut into a predetermined length. The conveyor belt which feeds the unvulcanized strip-shaped rubber member of a fixed width | variety which has to the conveyance means 2 is shown.

  For example, a large-diameter transfer drum 1 having a mirror-finished peripheral surface can be positioned in a posture in which the central axis is directed in the reciprocating direction of the conveying means 2. In addition to indexing and rotating over the angular range corresponding to the width dimension of the strip-shaped rubber member, continuous over the angular range corresponding to the entire circumference of the tire constituent member to be joined to the required number of strip-shaped rubber members Can be pivotally displaced.

  Then, the plate-like conveying means 2 is adjacent to the side of the transfer drum 1 under the action of the servo motor 4, for example, as shown in the solid line in the figure and as shown in the phantom line in the figure. Can be reciprocated linearly between the advancing limit position located in parallel therewith, and synchronized with, for example, the indexing rotary movement of the transfer drum 1 under the action of a crosshead mechanism (not shown). Then, it is possible to advance in the direction orthogonal to the reciprocating motion direction as shown by a one-dot chain line in the drawing and to return to the imaginary line position.

  By the way, the servo motor 4 here outputs, for example, its own rotation amount signal, and hence the displacement amount signal of the conveying means 2, in connection with or without relation to the operation of the sensor described later. it can.

  Further, the conveyor belt 3 is, for example, drawn from a winding roll or formed by an extruder and cut to a fixed length by a cutting device (not shown), as indicated by a virtual line in the figure. The unvulcanized strip-shaped rubber member 5 having a constant width is provided so as to be fed onto the upper surface of the conveying means 2 that moves forward and displaces at the same speed as the traveling speed of the conveyor belt 3.

  Further, in the figure, reference numeral 6 denotes a position-fixed sensor for detecting the passage of the strip-shaped rubber member 5, and this sensor 6 which can be a laser displacement meter detects, for example, the backward limit position of the conveying means 2. Then, the positioning means for stopping the operation of the conveying means 2, and consequently the servo motor 4, or, instead of or in addition to the above, detects the advance limit position of the conveying means 2 and stops the servo motor 4. It can also be used as a positioning sensor.

In carrying out the method according to the present invention using the apparatus as described above, first, it is cut into a predetermined length and supplied onto the traveling conveyor belt 3 as shown in FIG. The unvulcanized strip-shaped rubber member 5 is fed at the same speed as the conveyor belt 3 to the center of the width of the conveying means 2 that is moving forward, and in this case, the sensor 6 at the tip of the strip-shaped rubber member 5 is fed. Is detected based on, for example, the detection of thickness fluctuation by the sensor 6, and the rotation amount of the pulse motor 4 at that time, more specifically, for example, conveying means that is displaced at a constant speed, for example. 6 advance displacement positions P ₁ are stored.

Next, the passage of the rear end of the strip rubber member 5 is detected in the same manner by the sensor 6 as shown in FIG. 3 while the advancement displacement of the transport means 2 continues, and the advance of the transport means 6 at this time is detected. the displaced position P ₂ Similarly be stored.

Thereafter, the distance between the two advance displacement positions P and P ₂ stored, that is, the amount of movement of the conveying means 2 from the detection of the position P ₁ to the detection of the position P ₂ , for example,

P ₂ -P ₁

The calculated value is used as the length of the strip-shaped rubber member 5.

  The length of the rubber member 5 measured in this way is too short, exceeding a tolerance for a predetermined value, for example, ± 10 to 20% of the predetermined value or ± 5 to 10 mm. If it is too long, the conveying means 2, directly the servo motor 4 is stopped, and preferably, a warning or the like is generated in conjunction therewith. Unintentional sticking to the transfer drum 1 is reliably prevented in advance.

  On the other hand, as described above, the rubber member 5 whose length dimension is within the allowable value is transferred to the advance limit position of the conveying means 2 and then synchronized with the indexing movement of the transfer drum 1. Then, by being displaced together with the conveying means 2 in a direction orthogonal to the central axis of the transfer drum 1, the transfer drum 1 is adhered to the lower surface of the transfer drum 1 while entering the lower side.

  Therefore, such a sticking operation is performed repeatedly on the peripheral surface of the transfer drum 1 by sequentially repeating such a plurality of required strips of the rubber-like rubber member 5 with the side edges thereof being overlapped and joined. The required tire component can be formed which is stuck over its predetermined angular range.

  As described above, the case where the tire constituent member is formed on the transfer drum has been described. However, the present invention can be applied to the case where the tire constituent member is directly formed on the green drum instead of the transfer drum. Of course.

It is a basic-line perspective view which illustrates the sticking apparatus which can be used for implementation of this invention. It is a side view which illustrates the detection aspect of the front-end | tip position of a strip-shaped rubber member. It is a side view which illustrates the detection aspect of the rear end position of a strip-shaped rubber member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transfer drum 2 Conveying means 3 Conveyor belt 4 Servo motor 5 Strip-shaped rubber member 6 Sensor

Claims (5)

When the unvulcanized strip-shaped rubber member cut to a predetermined length is linearly transferred in the length direction by the conveying means and adhered to the peripheral surface of the drum,
The length of the strip-shaped rubber member being transferred on the conveying means is measured on the basis of detecting the passage of the front and rear ends of the rubber member with a sensor provided in association with the conveying means, A method for managing the length of a strip-shaped rubber member that stops the conveying means when the measured length exceeds an allowable length of the strip-shaped rubber member.   The length of a strip-shaped rubber member is calculated based on the moving amount | distance of the conveyance means after detecting the passage of the front-end | tip of a strip-shaped rubber member until the passage of the rear end is detected. Length management method for strip-shaped rubber members.   The strip-like shape according to claim 1 or 2, wherein the sensor is also used as a positioning sensor for detecting arrival of at least one of an advance limit position and a retract limit position of a transport unit that moves forward and backward within a predetermined range. Rubber member length management method.   The length management method of the strip-shaped rubber member according to any one of claims 1 to 3, wherein a laser displacement meter is used as the sensor. The tire is a tire molding drum or a constituent member transfer drum that forms a constituent member of a raw tire by superimposing and joining each of a plurality of strip-shaped rubber members at side edges on the peripheral surface thereof. The length management method of the strip-shaped rubber member in any one of 1-4.

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