Patent ID: 7985065

Claim:
A pitch adjustment device for a blow molding machine, comprising: a platform, capable of being driven to move linearly and reciprocatively while enabling its moving direction to be the same as a transportation path defined in the blow molding machine; a driving unit, for driving the platform to move linearly and reciprocatively; a screw rod unit, further comprising: a transmission mechanism; and a screw rod, having a plurality of guide slots formed thereon while being pivotally mounted on the platform in a manner that when the platform is being driven to move, the transmission mechanism is activated by the moving platform for bringing along the screw rod to rotate; a plurality of clipping units, each being slidably mounted on the platform at positions corresponding to the plural guide slots to be used for fixedly securing bottle embryos; wherein, the plural guide slots are formed on the screw rod in a manner that they are separated from each other by a same interval and, for any two neighboring guide slots, the two pitches measured between corresponding ends of the two neighboring guide slots are respective predefined; and the pitches between the plural clipping units are variable by the rotation of the screw rod as the plural clipping units are disposed at positions corresponding to the guide slots, and thereby, as the screw rod is being driven to move and thus rotate, the pitches between any two neighboring clipping units will be varied accordingly which is then causing the pitches between bottle embryos hold by their corresponding clipping units to vary.