ITMI950320U1 - MACHINE FOR THE PRODUCTION OF FOOTWEAR - Google Patents

Description

"MACHINE FOR THE PRODUCTION OF FOOTWEAR

The present innovation relates to a machine for the production of footwear and in particular footwear with a sole made by means of two or more injections of thermoplastic material.

Machines are already known which provide for the use of a mold consisting of a first half-mold and a plurality of second half-molds, each of them complementary to said first half-mold.

The realization of the sole therefore takes place in successive phases, each phase being characterized by the use of a different second half-mold coupled to the first half-mold, starting from the tread up to the layer in contact with the upper.

At the end the upper mounted on a suitable form is applied so that the injected material constituting the intermola is welded not only to the tread layer, but also to the upper itself.

In this case, the need to glue the sole to the upper itself is avoided.

Currently known machines provide for the use of rather complex devices for moving the second half-molds, which must be capable of:

- bring the second half of the mold required near the first half of the mold;

- quickly bring the second half of the mold close to the first until it is closed;

- exert a closing force sufficient to counteract the opening force due to the pressures generated inside the mold during the molding phase;

- and quickly move the second half of the mold away from the first.

The machines currently used are therefore, due to the high performance required, to be very complicated and expensive.

Another drawback that is encountered in currently known machines is the presence of the risers in correspondence with the various injection channels, risers which must then be removed, causing an extension of the production cycle.

The aim of the present invention is to solve the aforementioned problems by proposing a machine for the production of footwear, which is simple and inexpensive to manufacture, highly reliable and capable of eliminating the problem of the sprues to be removed.

This task is achieved by a shoe manufacturing machine, of the type comprising:

- a first half-mold;

- a plurality of second half-molds complementary to said first half-mold;

- means adapted to alternatively bring one of said second half-molds into correspondence with the first half-mold;

- means suitable for exerting a closing force on the mold to counteract the internal pressures,

in accordance with the characterizing part of the attached claims.

Further characteristics and advantages of the present invention will become clearer from the description of a preferred but not exclusive embodiment of the device illustrated by way of non-limiting example in the accompanying drawings in which:

Figure 1 is a side view of the machine with the mold open;

figure 2 is the same view of figure 1 with the mold closed.

With reference to the aforementioned figures, the machine according to the invention, globally indicated with the number 1, provides means 3 for alternately bringing a plurality of second half-molds 4,5 near a first half-mold 25, said second half-molds 4, 5 being each complementary to said first half-mold 25, the latter being preferably fixed to a work surface 8.

The machine according to the invention further provides means 7 for opening / closing the mold 4,5 and means 30 for clamping the mold 4,5 by pressure.

The means for moving the second half-molds are integral with the means 7 for opening / closing the mold.

The means 3 for alternatively bringing the second half-molds 4,5 into correspondence with the first half-mold 25 comprise a support 9 capable of rotating around a first axis 10.

In the preferred embodiment, the rotation of the support 9 around the first axis 10 is controlled by a linear actuator 16, for example a hydraulic cylinder, by means of a rack 17 and a gear, not shown, integral with the support 9 and coaxial with the first axis 10 .

The means 7 for opening / closing the mold perform a rotation between a first operating position, in which the second half-mold 4 moves in correspondence with the first half-mold, and a second operating position in which the half-mold 4 is raised with respect to the half-mold. clamping the mold 4,5, distinct from the means 7 for opening / closing the mold 4,5, are preferably constituted by a press 30 or the like. In the illustrated embodiment, the means 7 for opening / closing the mold 4,5 comprise a lever 20, hinged to the work surface 8.

The rotation of the lever 20 is controlled by a linear actuator 13 hinged between the plane 8 and the point 15 of application of the power on the lever 20.

Preferably, the injection channel 31 comprises an open surface section 32, which during the injection phase is closed at the top by the press 30. In this way, during the opening of the mold 4,5, the sprue is automatically torn from the molded piece, and the The operator only has to extract the sprue from the surface section 32.

The invention thus conceived is therefore susceptible of numerous modifications and variations, all of which are within the scope of the inventive concept.

In practice, the materials used, as well as the dimensions, may be any according to requirements.

Claims (4)

CLAIMS 1. Machine (1) for the production of footwear, of the type comprising: - a first half-mold (25); a plurality of second, half-molds (4,5) complementary to said first half-mold; - means (3) adapted to alternatively bring one of said second half-molds (4,5) into correspondence with the first half-mold (25). - means (30) adapted to exert a closing force on the mold (4,5) characterized by the fact that said second half-molds (4,5) are mounted on a shaft which is in turn mounted on a support (20) hinged to the structure of the machine, means (3) being provided for mounting said shaft (9) to alternatively carry said second half-molds in an operative position and means (7) adapted to mount said support (20) to bring the half-mold which is in an operative position in contact with said first half-mold. 2 . Machine (1), according to claim 1, characterized in that said means (3) for rotating the shaft (9) comprise a linear actuator (16) which drives a rack 17 engaged with a toothed wheel mounted on the 'shaft 9. 3. Machine, according to claim 1 or 2, characterized in that said means (7) adapted to rotate said support (20) comprise a lever (20) operated by a linear actuator (13) hinged between said lever (20) and the work surface. 4. Machine (1), for the production of footwear as described and / or illustrated.