A method is described for making injection molded pieces comprising two different materials for producing soles (10) for footwear with tread and midsole, wherein the first and second material are injected in a same mold (6) comprising a first imprint (6a) and a second imprint (6b) which, by being inserted in succession in a matrix (6c), locate recesses wherein tread and midsole are injected, the production being performed on machines of a carousel type (2), the carousel (2) comprising three stations (2a, 2b, 2c); the production of the soles (10) is performed in three revolutions of the carousel (2) according to the following modes: at the first revolution, the tread is extracted in the first station (2a); at the second revolution, the midsole is injected in the first station (2a); at the third revolution, the complete sole (10) is injected in the third station (2c) and the tread of the following sole (10) is injected; in order to produce a complete sole (10) every two revolutions of the carousel (2).
B29D 35/04 - Fabrication de chaussures fabriquées d'une seule pièce en utilisant une technique de moulage, p. ex. moulage par injection ou par coulée comportant des parties multicouches
B29D 35/14 - Fabrication de leurs parties constitutives, p. ex. semelles, talons ou empeignes, par une technique de moulage des parties multicouches
3.
FIXTURE FOR MOLDING THERMOPLASTIC AND THERMOSETTING POLYMERS, ELASTOMERS AND REACTIVE MIXTURES, IN PARTICULAR FOR PRODUCING FOOTWEAR
The present invention concerns a fixture (1) for molding thermoplastic and thermosetting polymers, elastomers and reactive mixtures, in particular for producing footwear, suitable to be employed on carousel-type plants. In this fixture, which is of the type which provides for a pair di half-rings which are closed by performing a horizontal movement, the half-rings (11, 12) are assembled on a pair of arms (13, 14), which can rotate around a substantially vertical axis, which perform a rotary movement, means being provided which are adapted to generate the rotary movement of said arms (13, 14).
B29D 35/10 - Fabrication de chaussures comportant des semelles préformées ou des talons préformés réunis sur des empeignes préformées en utilisant une technique de moulage, p. ex. par alimentation ou par injection de la matière plastique entre les différentes parties à joindre
B29D 35/12 - Fabrication de leurs parties constitutives, p. ex. semelles, talons ou empeignes, par une technique de moulage
B29D 35/14 - Fabrication de leurs parties constitutives, p. ex. semelles, talons ou empeignes, par une technique de moulage des parties multicouches
4.
MOULD HOLDER PROVIDED WITH A DEVICE TO FACILITATE THE OPERATIONS OF INSERTION/EXTRACTION OF MOULDS
The subject of the patent is a particular configuration of a mold holder, for the molding of parts in thermoplastic material, reactive mixtures (vulcanized rubber, PU) in particular footwear, to facilitate mold insertion/removal operations from the front part of the mold holder, the front door thereof being mounted on a device (2) adapted to make said door carry out a sequence of movements that move the door out of the front dimensions of the molds. Said device (2) is characterized in that it comprises: • a linear guide (9); · a slide (10), which travels on said guide (9); • means (11) adapted to make said slide travel (10) with respect to said guide (9); there being provided means adapted to carry said guide (9) and said slide (10) into vertical position, in such a manner that by operating said means (11), said door (7) moves vertically downward, out of the front dimensions of said molds.
B29D 35/06 - Fabrication de chaussures comportant des semelles ou des talons formés et réunis sur des empeignes préformées en utilisant une technique de moulage, p. ex. moulage par injection, pressage et vulcanisation
B29D 35/08 - Fabrication de chaussures comportant des semelles ou des talons formés et réunis sur des empeignes préformées en utilisant une technique de moulage, p. ex. moulage par injection, pressage et vulcanisation comportant des parties multicouches
The invention is a locking device (1) for columns (A) of presses (P) with two pairs (2, 3) of locking clamps (21, 22, 31, 32), wherein said clamps (21, 22, 31, 32) of one or both said pairs (2, 3) are mechanically connected to each other through at least one mechanism (61, 62) suited to guide in a synchronized way the relative translational motion of said two clamps (21, 22, 31, 32) of the same pair (2, 3), and wherein said guide mechanism (61, 62) is integral with said moving plane (Pm) in at least one fixed point (64), thus guaranteeing the symmetry of the motion of said clamps (21, 22, 31, 32) with respect to said fixed point (64).
The present invention relates to a plant for producing molded pieces with reactive mixtures, such as two-component polyurethane, with thermoplastic polymers, and with both said materials to produce the same piece, comprising: · one or more mold-holders (7, 7a, 7b, 7c); • one or more presses (302, 304), each of said presses being provided with an injector for thermoplastic polymers (303, 305); • one or more injectors for reactive mixtures (306, 307); and is characterized in that · each of said one or more mold-holders (7, 7a, 7b, 7c) is suitable to receive one or more molds (1a,s, 1ad); • each of said molds (1as, 1ad) comprises two or more half-molds (3as, 4as, 3ad, 4ad), said half-molds mutually interfacing at surfaces P, to form a closed cavity, and said joining surfaces P forming gaps which, when said mold (1as, 1ad) is in the operating position, are not present in the top part of said cavity.
Locking device for columns (A) of presses with at least one stationary platen and at least one moveable platen (E), comprising, in a containment body (D), a wedge flange (G) firmly fastened to the back of the tightening wedges (B) and able to translate axially, and where after the tightening of said wedges (B) on said column (A), the group formed by the piston (C) acting on said wedges (B), said wedge flange (G), said wedges (B) and said column (A) translates with a maximum stroke (m) limited by a starting or resting position of the wedge flange (G) to an end stop position, determined by the pressing of said wedge flange (G) on the rear plate (D2) of said containment body (D).
