JP2006289733A - Bead-core forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently produce a high quality bead-core by improving winding accuracy. <P>SOLUTION: A bead-core forming apparatus has a drum 3 which forms the bead-core A by winding a tape bead B delivered from a feed roller 2 a plurality of times, a cutting means 4 which cuts the tape bead B from the feed roller 2 at a cutting position P every time when the bead-core A is formed, and an induction means 5 which can hold the cut end part B1 on the feed roller side of the cut tape bead B, is actuated with the start of the feed roller 2 when the next bead-core A is formed, and induces the cut end part B1 from the cutting position P to the drum 3 at an induction velocity V1. The induction means 5 is driven by a servo-motor M1 which synchronizes the induction velocity V1 with a delivery velocity V2 at the start of the feed roller 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bead core forming apparatus provided with guiding means capable of guiding a front end portion of a bead core forming tape bead to a drum without causing slack.

  As the tire bead core A, as shown in FIG. 6, a so-called tape bead type bead core having a rectangular cross section formed by winding a belt-like tape bead B a plurality of times on the outer peripheral surface of the drum is frequently used. The tape bead B is formed by rubber coating a plurality (usually 4 to 6) of bead wires C arranged in parallel.

  As a forming apparatus for this type of bead core A, a structure shown in FIG. 7 is known (see, for example, Patent Document 1). The apparatus includes a feed roller a that feeds the tape bead B from a supply source, and a drum b that forms the bead core A by winding the tape bead B fed from the feed roller a. When the tape bead B is wound around the drum b a predetermined number of times, the feed roller a and the drum b are temporarily stopped and the tape bead B is cut at the cutting position p by the operation of the cutting means c. After cutting, the unwinding rear end portion of the tape bead B on the drum side from the cutting position p is wound up by restarting the drum b, and the bead core A is formed. The front end portion of the tape bead B that is closer to the feed roller than the cutting position p is held by the guiding means d.

  Then, when the next bead core A is formed, the guiding means d is activated when the feed roller a is started, and the front end portion is guided from the cutting position p to the rotating drum b to be adsorbed. As a result, winding of the tape bead B starts. Further, the guiding means d moves backward to the cutting position p after guiding and waits for the next cutting to be performed.

JP 2002-337250 A

  Here, in the supply source of the tape bead B, a plurality of bead wires C arranged in parallel are usually covered with rubber using a rubber extruder. Therefore, it is necessary to change the operation speed of the feed roller a according to the cross-sectional size of the tape bead B, the rubber extrusion efficiency, and the like. Moreover, since the feed roller a is started from a stopped state every time, the feed roller a is operated including an acceleration region in which the feeding speed gradually increases.

  In contrast, conventionally, the guide means d is driven by the air cylinder d1. Therefore, even if the air pressure and flow rate of the cylinder are adjusted, it is difficult to change the guide speed of the guide means d in accordance with the feed speed when the feed roller a is started. Therefore, due to the speed difference between the feed roller a and the guiding means d, the tape bead B that is guided is slackened and the winding accuracy is impaired.

  Therefore, the present invention is based on the fact that the guide means is driven by a servo motor, and the guide speed can be synchronized with the feed speed when the feed roller is started. An object of the present invention is to provide a bead core forming apparatus that can suppress, increase winding accuracy, and efficiently manufacture a high-quality bead core.

In order to achieve the above object, the invention of claim 1 of the present application includes a feed roller for feeding a strip-shaped tape bead in which a plurality of bead wires arranged in parallel are covered with rubber, from a supply source;
A drum that forms an annular bead core by winding the tape bead delivered from the feed roller a plurality of times on the outer peripheral surface;
Cutting means for cutting the tape bead from the feed roller at a cutting position for each formation of the bead core;
The cutting end of the cut tape bead on the feed roller side can be held, and when the next bead core is formed, the cutting end is actuated with the start of the feed roller to guide the cutting end from the cutting position to the drum at a guide speed V1. And guiding means to perform,
The guide means is driven by a servo motor that synchronizes the guide speed V1 with the feed speed V2 when the feed roller is started.

In the invention of claim 2, the drum has a torque limiter, and the tape bead is wound with a constant tension. In the invention of claim 3, the drum is wound around the outer peripheral surface. A plurality of magnet bodies for attracting and holding the cut end portion of the tape bead guided by the guiding means are provided.

  Since the present invention is configured as described above, it is possible to synchronize the guiding speed of the guiding means and the starting speed of the feed roller, and the occurrence of slack in the induced tape bead can be suppressed. High-quality bead core can be efficiently manufactured with high accuracy.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view conceptually showing a bead core forming apparatus of the present invention.

  In FIG. 1, a bead core forming apparatus 1 includes a feed roller 2 that feeds a tape bead B from a supply source, and a drum 3 that forms a bead core A by winding the tape bead B fed from the feed roller 2 a plurality of times. Each time the bead core A is formed, the cutting means 4 for cutting the tape bead B from the feed roller 2 at the cutting position P, and the cutting end B1 on the feed roller side of the cut tape bead B are held. Guiding means 5 for guiding the cutting end B1 from the cutting position P to the drum 3 is provided.

  Here, as illustrated in FIG. 6, the tape bead B is a belt-like body having a known structure in which a plurality of (usually 4 to 6) bead wires C arranged in parallel are covered with rubber, and the bead wire C is a magnetic body. By using a steel wire such as a certain hard steel wire, it is formed so as to be attracted to the magnet.

  The supply source of the tape bead B may be a tape bead forming device for forming the tape bead B itself, or the tape bead B is rewound from a roll body around which the tape bead B is once formed. A rewinding device may be used. In the case of a tape bead forming apparatus, the apparatus includes a plurality of bobbins around which bead wires C are wound, a guide for arranging bead wires unwound from each bobbin in parallel, and a rubber extruder for covering the array of bead wires with rubber. . Then, the tape bead B from the supply source is introduced into the feed roller 2 through a well-known accumulator section that temporarily stores the tape bead B by folding it back into a U-shape.

  The feed roller 2 is a drive roller connected to a servo motor, and feeds the tape bead B to the drum 3. Reference numeral 7 denotes a measuring roller equipped with a rotational angle measuring device such as a rotary encoder, which is arranged between the feed roller 2 and the accumulator unit and below the feed roller 2, and the tape bead B is formed in a U-shape. Wrapped around and wrapped. The measuring roller 7 can measure the supply length by the rotation angle measuring device, and when the measured value reaches a predetermined value (set length for forming the bead core A), the feed roller 2 and the drum 3 are moved. Once stopped, the cutting means 4 is operated. The measuring roller 7 comes into contact with the tape bead B in an area of 40% or more of one round, and increases the measurement accuracy by suppressing slippage with the tape bead B. Reference numeral 8 in the figure denotes a tensioner that prevents the tape bead B from slacking, and reference numeral 9 denotes a pinch roll that presses the tape bead B against the feed roller 2.

  Next, the drum 3 includes an outer peripheral surface 3S around which the tape bead B is wound, and a plurality of magnet bodies 10 that adsorb and hold the tape bead B on the outer peripheral surface 3S are provided on the magnet surface. The outer peripheral surface 3S is flush with the surface and embedded in the circumferential direction with an interval. Therefore, the drum 3 can adsorb the cut end B1 of the tape bead B at any position in the circumferential direction. The drum 3 is configured to be able to reduce the diameter by a plurality of segments (not shown) divided in the circumferential direction, whereby the bead core A can be detached from the drum 3. The drum 3 is driven in conjunction with the feed roller 2 by a servo motor. Further, a torque limiter is interposed on the drum 3, and the tape bead B from the feed roller 2 is wound with a certain tension.

  Further, as shown in FIG. 2, the cutting means 4 includes a cutting blade 12 at the tip of a rod of a lifting / lowering tool 11 such as a cylinder. Then, when the feed length of the tape bead B by the feed roller 2 reaches a predetermined value and the feed roller 2 and the drum 3 are stopped, the tape bead B is cut at the cutting position P. In the figure, reference numeral 14 denotes a guide for the cutting blade 12, and reference numeral 13 denotes a contact plate. After the cutting, the cutting end portion of the tape bead B on the drum side from the cutting position P (corresponding to the rear end portion of the tape bead B wound earlier) is wound up by restarting the drum 3, and the bead core A Is formed. Further, a cutting end B1 (corresponding to a front end portion of the tape bead B to be wound next) which is closer to the feed roller than the cutting position P is held by the guiding means 5.

  When the next bead core A is formed, the guiding means 5 is activated when the feed roller 2 is started, and the cutting end B1 (front end) is guided from the cutting position P to the drum 3 at a guide speed V1.

  As shown in FIGS. 2 and 3, in this guiding means 5, a holder 16 that holds the tape bead B is attached to a traveling table 19 that is supported by a linear bearing 18 so as to be movable back and forth. The holder 16 has a long rectangular tube shape extending in the front-rear direction, and a guide hole 21 having a rectangular cross section into which the tape bead B is loosely inserted is formed therein. As shown in FIG. 4, the holding tool 16 has a locking portion 16 </ b> A that can lock the tape bead B inserted through the guide hole 21 and holds the cut end B <b> 1 so as to be movable integrally with the holding tool 16. Yeah. In this example, the locking portion 16A includes a cam-like tilting piece 16A1 that can be tilted by expansion and contraction of the cylinder, and holds the tape bead B with a narrow pressure between the bottom surface of the guide hole 21 when the cylinder is operated. be able to.

  In addition, the traveling table 19 is driven and controlled by a servo motor M1 via a ball screw mechanism 23 in this example. In this example, the ball screw mechanism 23 includes a screw shaft 23A that extends in the front-rear direction and is rotatably supported, and a screw hole 23B that can be screwed into the screw shaft 23A and formed in the traveling base 19. . The servo motor M1 is connected to one end of the screw shaft 23A via an appropriate drive transmission means.

  Here, the feed roller 2 is operated from a stopped state every time the bead core A is formed. Therefore, the feeding speed V2 of the tape bead B by the feed roller 2 reaches the constant speed area Yb through the acceleration area Ya that gradually increases from the start as schematically shown in FIG. Therefore, in order to suppress the occurrence of slack in the induced tape bead B, the guiding speed V1 of the guiding means 5 is synchronized with the sending speed V2 at the start including the acceleration area Ya. is necessary. For this reason, a servo motor M1 is used for the guiding means 5, and the guiding speed V1 is controlled so as to substantially coincide with the feeding speed V2. Note that substantially matching means that the speed difference | V2−V1 | is 1% or less of the sending speed V2.

  By tuning in this way, it is possible to prevent looseness of the tape bead B at the time of guidance, and it is possible to increase the winding accuracy and efficiently manufacture a high-quality bead core. In addition, even when the production line speed is changed, it can be easily handled and stable production operation can be performed.

As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

It is a side view which shows notionally one Example of the bead core formation apparatus of this invention. It is a side view which expands and shows a guidance means. It is sectional drawing of a guidance means. It is sectional drawing which shows the latching | locking part of a guidance means. It is a graph which shows synchronization with the speed of guidance and the speed of sending. It is a perspective view explaining a bead core. It is a perspective view which shows the conventional bead core formation apparatus.

Explanation of symbols

2 Feed roller 3 Drum 4 Cutting means 5 Guiding means 10 Magnet body A Bead core B Tape bead B1 Cutting end C Bead wire P Cutting position

Claims (3)

A feed roller for feeding a strip-shaped tape bead in which a plurality of bead wires arranged in parallel are covered with rubber;
A drum that forms an annular bead core by winding the tape bead delivered from the feed roller a plurality of times on the outer peripheral surface;
Cutting means for cutting the tape bead from the feed roller at a cutting position for each formation of the bead core;
The cutting end of the cut tape bead on the feed roller side can be held, and when the next bead core is formed, the cutting end is actuated with the start of the feed roller to guide the cutting end from the cutting position to the drum at a guide speed V1. And guiding means to perform,
The bead core forming apparatus, wherein the guide means is driven by a servo motor that synchronizes the guide speed V1 with the feed speed V2 when the feed roller is started.   The bead core forming apparatus according to claim 1, wherein the drum has a torque limiter and winds the tape bead with a constant tension.   3. The bead core forming apparatus according to claim 1, wherein the drum is provided with a plurality of magnet bodies that attract and hold the cut end portion of the tape bead guided by the guide means on the outer peripheral surface. .

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