Vertical blow molding machine
Vertical blow molding machine
The invention provides a vertical blow molding machine capable of stopping the repeatedly revolved turntable at predetermined positions. During operation of a vertical blow moulding machine having one or more lower molds mounted on a turntable and an upper mold mounted on an upper retention plate, lubricant is periodically fed from a pump to a slide portion S of the revolving turntable.
Heretofore, a so-called two-station type vertical injection moulding machine has been used, having two lower molds mounted on a turntable which are moved to positions capable of being clamped with a single upper mold by the revolving motion of the turntable, and being clamped in the vertical direction. According to this so-called two-station vertical blow molding machine in which a plurality of lower molds are clamped with an upper mold.
In order to produce such molded products in which metallic insert components are integrally molded with resin, it is necessary to assemble the insert component in advance to one of the molds before clamping the molds, so the lower mold being revolved together with the revolving movement of the turntable must be stopped accurately without displacement at a predetermined position capable of being clamped with the upper mold.
However, since according to the blow molding machines of FIG. 6 the stopper pin is repeatedly pressed against the stopper for molding by the revolutions of the turntable in both directions, the contact portions of the stopper pin and the stopper are both worn. When the vertical blow molding machine is operated for a long period of time, the components such as the stopper pin used for positioning are worn away, making it difficult to stop the lower molds at predetermined positions. Moreover, if the vertical blow molding machine is continuously operated in the state in which the contact portions are worn away.
Further, when the stopper pin collides against the stopper, not only the stopper pin and the stopper but also the drive system of the turntable may be damaged. However, by increasing the reduction distance, the time required from the starting of the revolution of the turntable to the stopping thereof is increased, and as a result, the overall molding cycle is elongated. Further, as in the case with the two-station plastic injection molding machine having two molds mounted on the turntable as shown in FIG. 6, if the two molds on the turntable are revolved in reciprocating motion for 180 degrees at a time with the revolution of the turntable.
The invention provides a vertical blow molding machine capable of stopping the repeatedly revolved turntable at predetermined positions. During operation of a vertical blow moulding machine having one or more lower molds mounted on a turntable and an upper mold mounted on an upper retention plate, lubricant is periodically fed from a pump to a slide portion S of the revolving turntable.
Heretofore, a so-called two-station type vertical injection moulding machine has been used, having two lower molds mounted on a turntable which are moved to positions capable of being clamped with a single upper mold by the revolving motion of the turntable, and being clamped in the vertical direction. According to this so-called two-station vertical blow molding machine in which a plurality of lower molds are clamped with an upper mold.
In order to produce such molded products in which metallic insert components are integrally molded with resin, it is necessary to assemble the insert component in advance to one of the molds before clamping the molds, so the lower mold being revolved together with the revolving movement of the turntable must be stopped accurately without displacement at a predetermined position capable of being clamped with the upper mold.
However, since according to the blow molding machines of FIG. 6 the stopper pin is repeatedly pressed against the stopper for molding by the revolutions of the turntable in both directions, the contact portions of the stopper pin and the stopper are both worn. When the vertical blow molding machine is operated for a long period of time, the components such as the stopper pin used for positioning are worn away, making it difficult to stop the lower molds at predetermined positions. Moreover, if the vertical blow molding machine is continuously operated in the state in which the contact portions are worn away.
Further, when the stopper pin collides against the stopper, not only the stopper pin and the stopper but also the drive system of the turntable may be damaged. However, by increasing the reduction distance, the time required from the starting of the revolution of the turntable to the stopping thereof is increased, and as a result, the overall molding cycle is elongated. Further, as in the case with the two-station plastic injection molding machine having two molds mounted on the turntable as shown in FIG. 6, if the two molds on the turntable are revolved in reciprocating motion for 180 degrees at a time with the revolution of the turntable.