JP5152889B2 - Ribbon rubber molding machine - Google Patents

Description

The present invention relates to molding equipment of the ribbon-like rubber molding by causing the ribbon-like rubber extruded from a rubber extruder is passed through a gap between the pair of rollers, in particular, during its molding of the ribbon-like rubber about the ribbon-shaped rubber molding equipment can be changed in thickness.

  The ribbon-like rubber extruded from a small rubber extruder is spirally formed on the outer peripheral surface of the rotating support for the purpose of downsizing the tire manufacturing equipment, improving tire uniformity, and supporting small lot multi-size production. A tire molding method in which a rubber member having a predetermined cross section is assembled by winding and laminating is known. In this tire molding method, a ribbon-shaped rubber molding device that molds a ribbon-shaped rubber extruded from a rubber extruder and identifies its cross-section and sticks it to the outer peripheral surface of a rotating support is used. The position with respect to the rotation support is controlled, and the ribbon is wound around the rotation support in a spiral manner while overlapping the edges of the ribbon-like rubber.

This molding apparatus includes a pair of rollers facing each other, and has a rolling surface that allows a ribbon-shaped rubber to pass through a gap (gap) between the outer peripheral surfaces thereof to specify the cross-sectional shape and size thereof. The rolled surface is configured to hold the passed ribbon-like rubber and to function as a surface to be attached to the rotating support (see Patent Document 1).
JP 2000-79642 A

  However, in the apparatus described in Patent Document 1, since the gap between the pair of rollers is constant, when changing the thickness of the ribbon-like rubber, one of the rollers is replaced with one having a different diameter, It is necessary to replace the roller with a different set of gaps. For this reason, the jig | tool and tool for replacement work are required, and there exists a problem that the time which an apparatus cannot operate will generate | occur | produce. Further, there is a problem that the thickness of the ribbon-like rubber cannot be changed when the ribbon-like rubber is molded and attached to the rotary support.

  The present invention has been made to solve such problems, and a first object of the invention is to form a ribbon-shaped rubber molding in which a ribbon-shaped rubber extruded from a rubber extruder is molded by a gap between a pair of rollers. In the apparatus, it is possible to change the dimension of the gap without exchanging the pair of rollers or one of them, and the second purpose is to enable the thickness of the ribbon-like rubber to be changed during molding. is there.

The invention according to claim 1 includes a pair of rollers whose outer peripheral surfaces are arranged to face each other with a predetermined gap therebetween, and a ribbon-like rubber extruded from a rubber extruder is molded by passing through the gap. a ribbon-shaped rubber molding device, Rutotomoni includes a gap varying means for varying the size of the gap, the pair of rollers have different diameters, and the diameter larger rollers the molded ribbon through the outer peripheral surface of the A first shaft that has a function of sticking rubber to the outer peripheral surface of the rotary support, and wherein the gap changing means passes through the center of one of the pair of rollers and rotatably supports the roller; A second axis having an axis that is fixed to an end surface of the first axis and decentered with respect to the axis of the first axis, and a rotational position of the second axis according to a set value of the gap Set A ribbon-like rubber molding apparatus characterized by comprising a means.
The invention according to claim 2 is the ribbon-shaped rubber molding apparatus according to claim 1, wherein the setting means includes a pinion fixed to the outer peripheral surface of the second shaft, and a rack for rotating the pinion. This is a ribbon-like rubber molding apparatus characterized by the above .

(Function)
According to the first aspect of the present invention, the gap variable means changes the size of the gap between the pair of rollers for molding the ribbon-shaped rubber, and the molded ribbon-shaped rubber is changed to the larger diameter roller. It has a function of sticking to the outer peripheral surface of the rotary support through the outer peripheral surface. Further, the gap varying means is fixed to the first shaft that passes through the center of one of the rollers and rotatably supports the roller and the end surface of the first shaft, and is eccentric with respect to the axis of the first shaft. For a second axis having an axis, the rotational position of the second axis is set to a value corresponding to the set value of the gap between the rollers, and the axis of the first axis is set to the gap of the second axis. The dimension of the gap between the pair of rollers is changed by decentering the value corresponding to .
According to the invention of claim 2, the pinion fixed to the outer circumferential surface of the second shaft is rotated by the rack, to set the rotational position of the second shaft.

According to the present invention, when the ribbon-like rubber extruded from the rubber extruder is molded by passing the gap between the pair of rollers, the size of the gap can be changed without replacing the pair of rollers or one of them. It becomes possible and the thickness of the ribbon-shaped rubber can be changed when it is molded. Further, the molded ribbon-like rubber can be attached to the outer peripheral surface of the rotating support through the outer peripheral surface of the roller having the larger diameter.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of a ribbon-shaped rubber manufacturing apparatus provided with a ribbon-shaped rubber molding apparatus according to an embodiment of the present invention. In the following description, the direction in which the ribbon-like rubber is extruded from the rubber extruder is assumed to be the front.

  The ribbon-shaped rubber manufacturing apparatus according to the present embodiment includes a rubber extruder 1 that extrudes ribbon-shaped rubber and a ribbon-shaped rubber molding apparatus 2 that molds the ribbon-shaped rubber extruded from the rubber extruder 1. The ribbon-shaped rubber extruder 1 is disposed in front of the hopper 3 for charging the ribbon-shaped rubber material, a screw 4 for pushing the ribbon-shaped rubber material charged from the hopper 3 forward, A gear pump 5 that feeds the ribbon-shaped rubber material pushed in by the screw 4 at a speed corresponding to the rotational speed of the gear; a base 6 that is disposed in front of the gear pump 5 and defines the shape of the ribbon-shaped rubber that is pushed forward; Consists of. The ribbon-shaped rubber molding device 2 includes a pair of rollers 7 and 8 whose outer peripheral surfaces are opposed to each other with a predetermined gap Gp therebetween, and allows the ribbon-shaped rubber extruded from the base 6 to pass through the gap Gp. It has the function of sticking the rolled and molded ribbon-like rubber on the outer peripheral surface of the rotary support 10. The pair of rollers 7 and 8 are connected to the base 6 via a support not shown. Further, the rubber extruder 1 and the ribbon-shaped rubber molding device 2 are formed as an integrated object, and the integrated object is placed and moved so that the ribbon-shaped rubber can be attached along the surface of the rotary support 10. Possible moving means 9 are provided.

  Of the pair of rollers 7 and 8, a small diameter roller (hereinafter referred to as a small diameter roller) 7 arranged on the upper side has a state in which its axis is parallel to the axis of a large diameter roller (hereinafter referred to as a large diameter roller) 8. It is possible to approach and separate in the direction connecting the axis lines with each other while maintaining it, so that the dimension of the gap Gp can be adjusted. The outer peripheral surface of the large-diameter roller 8 is brought into contact with the surface of the rotary support 10 so that the ribbon-like rubber can be attached to the surface of the rotary support 10 through the outer peripheral surface of the large-diameter roller 8. ing.

  Next, the structure of the ribbon-shaped rubber molding apparatus 2 will be described with reference to FIG. (A) of this figure is the figure seen from the outer peripheral side of the roller of the ribbon-shaped rubber molding apparatus 2, (b) is the figure seen from the side of the roller. For convenience, in FIG. 2B, illustration of a part of the members shown in FIG. 2A and the teeth of the rack and the pinion are omitted.

  As shown in FIGS. 2A and 2B, the shaft 11 passes through the center of the large-diameter roller 8, and a bearing 17 is provided at a position facing the inner peripheral surface of the large-diameter roller 8 on the outer peripheral surface thereof. , 18 are provided. A shaft 12 passes through the center of the small diameter roller 7, and bearings 19 and 20 are provided on the outer peripheral surface of the shaft 12 at positions facing the inner peripheral surface of the small diameter roller 4. A shaft 13 is fixed to one end (left end in the drawing) of the shaft 12, and a shaft 14 is fixed to the other end (right end in the drawing) of the shaft 12. One end of the shaft 11 and the shaft 13 are connected by a support 15, and the other end of the shaft 11 and the shaft 14 are connected by a support 16. Here, the shaft 11 is fixed to the supports 15 and 16, and the shafts 13 and 14 are rotatably attached to the supports 15 and 16 via bearings 21 and 22, respectively.

  A pinion 25 is fitted into the right end of the shaft 14. The pinion 25 is fixed to a piston rod 27 of a piston cylinder mechanism 26 such as a hydraulic cylinder. The rack 29 advances and retreats in conjunction with the advance and retreat in the direction of arrow A. Are engaged. Sprockets 23 and 24 are fixed to one side surface (the right side surface in the figure) of each of the large diameter roller 8 and the small diameter roller 7, and a chain is wound around the sprockets 23 and 24, and the sprocket 23 is illustrated. The large-diameter roller 8 and the small-diameter roller 7 can be rotated around the shafts 11 and 12, respectively, by being rotated by a rotation driving means that is not provided.

  The shafts 13 and 14 have the same diameter and axial position. On the other hand, the shaft 12 has a larger diameter than the shafts 13 and 14 and the axis L1 is eccentric from the axis L2 of the shafts 13 and 14 (eccentric amount α). In FIG. 2, the piston 28 of the piston cylinder mechanism 26 is located at the top dead center, and accordingly, the axis L1 of the shaft 12 is offset from the axis L3 of the shaft 11 rather than the axis L2 of the shafts 13 and 14. It exists only in a distant position. When the piston 28 is lowered from the state of FIG. 2, the pinion 25 rotates clockwise in FIG. 2B, and when the piston 28 reaches the bottom dead center, the pinion 25 is rotated 180 degrees. In this state, the axis L1 of the shaft 12 is located closer to the axis L3 of the shaft 11 than the axis L2 of the shafts 13 and 14 by the amount of eccentricity α. Therefore, the dimension of the gap Gp between the large diameter roller 8 and the small diameter roller 7 is 2α smaller than the state of FIG. That is, the dimension of the gap Gp can be changed by twice the eccentric amount α as the piston 28 moves up and down. Further, since the top dead center and the bottom dead center of the piston 28 are used for setting the rotation angle of the shaft 12, the dimension of the gap Gp varies due to the reaction force of the rubber passing through the gap Gp between the rollers 7 and 8. And stable molding can be performed.

  Operation | movement of the ribbon-shaped rubber manufacturing apparatus which has the above structure is demonstrated. First, when the production of the ribbon-shaped rubber is started, a controller not shown in the drawing shows a ribbon-shaped rubber for the hopper 3 according to the thickness of the tire constituent member (tread rubber, sidewall rubber, etc.) wound around the rotary support 10. The operation is started after the material supply speed, the rotation speed of the screw 4, the rotation speed of the gear pump 5, and the gap Gp between the small diameter roller 7 and the large diameter roller 8 are set. Here, when setting the gap Gp, the rack 29 is moved up and down to rotate the pinion 25 by changing the position of the piston 28 of the piston cylinder mechanism 26. As a result, the axis L1 of the shaft 12 approaches and separates from the axis L3 of the shaft 11, and as a result, the distance of the outer peripheral surface of the small diameter roller 7 with respect to the outer peripheral surface of the large diameter roller 8, that is, the gap Gp changes.

  The rubber raw material supplied to the hopper 3 of the rubber extruder 1 from a ribbon rubber raw material supply device (not shown) is pushed forward by the screw 4 and sent forward by the gear pump 5, and is fed from the base 6 to the ribbon. Is pushed into a gap Gp formed between the small-diameter roller 7 and the large-diameter roller 8 of the rubber molding apparatus 2.

  In the ribbon-like rubber molding apparatus 2, the sprocket 23 fixed to the large-diameter roller 8 is rotated by the action of a rotation driving means (not shown), and the rotation is transmitted to the sprocket 24 fixed to the small-diameter roller 7 by a chain. Is done. Therefore, the large-diameter roller 8 rotates around the shaft 11 with the bearings 17 and 18 interposed therebetween, and the small-diameter roller 7 rotates around the shaft 12 with the bearings 19 and 20 interposed therebetween. The extruded ribbon-like rubber is molded into a predetermined thickness and width by passing through the gap Gp between the rotating large-diameter roller 8 and the small-diameter roller 7, and passes through the outer peripheral surface of the large-diameter roller 8. Affixed to the surface of the rotary support 10. At this time, by moving the moving means 9 in the axial direction of the rotary support 10, it can be spirally wound while overlapping the side edge portions of the ribbon-like rubber.

  When changing the thickness of the ribbon-like rubber wound around the rotary support 10, the piston cylinder mechanism 26 is operated to move the piston 28 up and down under the control of the controller, and the gap Gp is set to a dimension corresponding to the changed thickness. . Since this change can be performed automatically in about 1 to several seconds, after one layer is wound around the rotating support 10, it is completed during the waiting time between the start of winding of the next layer. For this reason, there is no time when the apparatus cannot operate. Even when the rollers 7 and 8 are rotated and the ribbon-shaped rubber is wound around the rotating support 10, the piston 28 is moved up and down and the pinion 25 is rotated to change the gap Gp and change the thickness of the ribbon-shaped rubber. can do.

  Further, when changing the gap Gp, the supply speed of the rubber material to the hopper 3 and the rotation speed of the screw 4 and the gear pump 5 are simultaneously changed so that the rubber extrusion speed of the extruder 1 is changed to the thickness of the ribbon-like rubber. It may be changed accordingly. In this way, even when the thickness of the ribbon-like rubber is changed, the ribbon-like rubber can be wound around the rotary support 10 at the same speed as before the change.

  As described above, according to the ribbon-shaped rubber manufacturing apparatus according to this embodiment, the gap can be automatically adjusted by the piston cylinder mechanism 26 in about 1 to several seconds. Therefore, a roller for switching the thickness of the ribbon-shaped rubber. The replacement work becomes unnecessary. For this reason, a jig | tool and a tool for exchange work become unnecessary, and a jig | tool and a tool can be saved. In addition, since the time during which the apparatus cannot be operated does not occur, manufacturing efficiency is improved. Furthermore, since the thickness of the ribbon-like rubber can be changed even while the ribbon-like rubber is wound around the rotary support 10, tire components having various cross-sectional shapes can be manufactured.

  In the above embodiment, the top dead center and the bottom dead center of the piston 28 correspond to the upper end and the lower end of the movable range of the rack 29, respectively, and the rotational position of the shaft 12 is set. You may set the rotation position of the axis | shaft 12 in the position between. Further, instead of using the eccentric shaft 12, the shaft passing through the center of the small-diameter roller 7 is set as a non-eccentric shaft similar to the shaft 11 of the large-diameter roller 8, and the shaft is substantially continuous (stepless) by an electric actuator or the like. It can also be configured to be displaceable.

It is a figure which shows schematic structure of the ribbon-shaped rubber manufacturing apparatus provided with the ribbon-shaped rubber molding apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the ribbon-shaped rubber molding apparatus in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rubber extruder, 2 ... Ribbon-shaped rubber molding apparatus, 7 ... Small diameter roller, 8 ... Large diameter roller, 12, 13, 14 ... Shaft, 25 ... Pinion, 26 ... Piston cylinder mechanism, 29 ... Rack.

Claims (2)

A ribbon-shaped rubber molding apparatus that has a pair of rollers whose outer peripheral surfaces are arranged to face each other with a predetermined gap therebetween, and forms a ribbon-shaped rubber extruded from a rubber extruder by passing through the gap. ,
Rutotomoni comprising a gap varying means for varying the size of the gap,
The pair of rollers have different diameters and have a function of sticking the molded ribbon-like rubber to the outer peripheral surface of the rotating support through the outer peripheral surface of the roller having a larger diameter,
The gap varying means passes through the center of one of the pair of rollers, is fixed to the first shaft that rotatably supports the roller, and the end surface of the first shaft, Ribbon-like rubber molding comprising: a second shaft having an axis that is eccentric with respect to the axis of the shaft; and means for setting a rotational position of the second shaft in accordance with a set value of the gap apparatus. In the ribbon-shaped rubber molding apparatus according to claim 1,
The ribbon-shaped rubber molding apparatus characterized in that the setting means includes a pinion fixed to the outer peripheral surface of the second shaft and a rack for rotating the pinion .

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