Machine for making containers by blow-moulding plastic parisons
First Claim
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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Accused Products
Abstract
The invention concerns a machine for manufacture of containers (13), such as bottles, pots, and all other types of hollow bodies, by heat treating, then blow-molding, plastic preforms (1). The machine includes at least two wallet-type molds (41, 44) positioned on the periphery of a circular conveyor. Each mold incorporates at least two mold cavities. The machine includes a preform heat-treatment apparatus in which the pitch (P1) between the longitudinal axes of two successive preforms is smaller than the pitch (P2) between the longitudinal axes of two adjacent cavities belonging to the same mold, and means (5A) for modifying the pitch of the preforms between the drive mechanism and a mold. The machine is characterized by the fact that the pitch-modification means (5A) incorporate at least two adjacent movable devices (52) which are configured so as to be adjustable to the first pitch (P1) when they are positioned opposite the drive mechanism and to the second pitch (P2) when they are positioned facing the means (5B) designed to transfer the performs to the molds.
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Citations
21 Claims
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1. Machine for the manufacture of containers (13) by blow-molding preliminarily-injected preforms (1), comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A machine for the manufacture of containers by blow-molding preliminarily-injected preforms, comprising:
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a conveying device which conveys preforms along a path on which a heat-treatment station is positioned, and which includes preform holding devices to hold two successive preforms spaced apart by a first pitch (P1); at least two molds arranged on the periphery of a blow-molding circular conveyor, in which the molds are wallet molds, each comprising at least two mold cavities and in which the longitudinal axes of two adjacent cavities are spaced apart by a second pitch (P2); a pitch-modification mechanism which modifies the pitch of the preforms, in order to convert them from the first pitch (P1) to the second pitch (P2); a transfer mechanism which transfers at least two preforms so as to collect them on the pitch-modification mechanism when the preforms are spaced apart by the second pitch and to feed them into a mold; wherein the pitch-modification mechanism comprises at least two adjacent movable devices, each fitted with a preform position-retention element 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 conveying device, and to the second pitch (P2) when the position-retention elements are positioned facing the transfer mechanism.
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Specification