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Machine for making containers by blow-moulding plastic parisons

  • US 5,863,571 A
  • Filed: 09/02/1997
  • Issued: 01/26/1999
  • Est. Priority Date: 03/02/1995
  • Status: Expired due to Term
First Claim
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1. Machine for the manufacture of containers (13) by blow-molding preliminarily-injected preforms (1), comprising:

  • a device (3) for conveying and holding in position preforms along a path on which a heat-treatment station (32) is positioned, with means (31) designed to keep two successive preforms spaced apart by a first pitch (P1);

    at least two molds (41, 42, 43,

         44) arranged on the periphery of a blow-molding circular conveyor (4), in which the molds are wallet molds, each comprising at least two mold cavities (48A, 48B;

    49A, 49B) and in which the longitudinal axes of two adjacent cavities are spaced apart by a second pitch (P2);

    means (5A) for modifying the pitch of the preforms, in order to convert them from the first pitch (P1) to the second pitch (P2);

    first means (5B) for transferring at least two preforms so as to collect them on the pitch-modification means when the preforms are spaced apart by the second pitch and to feed them into a mold;

    wherein the pitch-modification means (5A) comprises at least two adjacent movable devices (52), each fitted with a preform position-retention element (53) and arranged so as to be able to convert the position-retention elements to the first pitch (P1) when the position-retention elements are positioned opposite the device for conveying and holding the preforms, and to the second pitch (P2) when the position-retention elements are positioned facing the first transfer means.

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