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).
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 - Producing footwear having preformed soles or heels joined on to preformed uppers using a moulding technique, e.g. by feeding or injecting plastics material between the parts to be joined
B29D 35/12 - Producing parts thereof, e.g. soles, heels or uppers, by a moulding technique
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 - Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
B29D 35/08 - Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts
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).
This invention relates to an injection press for moulding pieces from polymer material, which said pieces may be constituted by two identical materials with different colours. Said injection press can also produce pieces of a single colour, but with higher productivity than the injection presses according to the prior art. Said injection press, which comprises: • a lower base (2); • a plurality of first columns (3a, 3b, 3c, 3d) or (30a, 30b, 30c, 30d) mounted on said base (2), which act as support for an upper fixed crosspiece (4); • a mobile crosspiece (5), which slides on said first columns (3a, 3b, 3c, 3d) or (30a, 30b, 30c, 30d), first means (6a) designed to lock said mobile crosspiece (5) in relation to said upper fixed crosspiece (4) being provided; • a first and second mould S1 and S2 mounted between said lower base (2) and said mobile crosspiece (5); • second means designed to exert the force required to clamp said moulds S1 and S2, counteracting the pressure exerted by a molten polymer injected by a pair of injectors (11); is characterised in that: • the lower parts or mould halves S1i and S2i of said first and second moulds S1 and S2 are mounted side by side on said lower base (2); • the upper parts or mould halves S1s and S2i of said first and second moulds S1 and S2 are mounted side by side on said mobile crosspiece (5); • a cavity designed to be filled with molten polymer is present in said first upper mould half S1s and said second lower mould half S2i or, alternatively, in said second upper mould half S2s and said first lower mould half S1i; third means (10) and fourth means (10a) being designed to move said first and second upper mould halves S1s and S2s parallel to themselves, so as to bring said upper mould half S1s or S2s, which contains said impression, in correspondence with said second or first lower mould half S2i or S1i which contains said impression designed to be filled with molten polymer.
