FR2490549A1 - Interchange of shoe sole mould bases by linear support plate motions - for less complexity than use of rotary supports - Google Patents

Abstract

The support for alternative cavity bases for making composite injection moulded shoe soles comprises a plate which can shift horizontally to engage/disengage the bases relative to a cavity mould on plates clamped in a press. The sole plate can also shift vertically to align alternate sole bases with the cavity. Injection of the sole materials is via the cavity bases and their support plate. Alignment may be controlled by the mechanical limits of the plate motions and/or by guide dowels. Simpler and more compact than rotary systems for aligning alternative cavity bases with the cavity.

Description

 The invention relates to an injection machine for the production of boots, booties or shoes, the sole of which comprises at least two layers of different plastics, in particular materials of different colors or qualities. In this case, the injection of these materials is carried out in turn in the same mold. At least two mold pieces, or pavers, of profiles corresponding to the shape of the different sole layers are therefore provided. These sole blocks must title brought successively into position against the molding shells of the rod, the second block being placed so that the injection mold of the second layer closes on the first layer previously injected.

 Various devices have been proposed for moving these blocks of soles. One of these devices provides for the mounting of the blocks on the opposite faces of the same plate, the positioning of each of the blocks taking place by inversion or rotation of this plate. Another device provides for the mounting of the pavers on a rotating mounted part which, in cross section perpendicular to its axis of rotation, has the shape of a profile with two or more, angles or angle sections which carry the pavers on their outside.

 These devices are quite bulky and lead to complicated assemblies.

 The present invention aims to provide a device for carrying mold parts, or pavers, adjustable to manufacturing machines of the type indicated above, which is simple to make and easy to handle.

 To this end, the device according to the invention consists of a panel, or door, mounted movable in vertical and horizontal translations and carrying, on the same face, the mold parts, or blocks, intended for successive sole moldings, the injection holes being mutually parallel and perpendicular to said face.

Such a device is extremely simple to implement since it suffices to make it undergo, after injection into the first mold part, a horizontal translation to open this part, a vertical translation to bring the second face block to the layer already in
Bectée, then a second horizontal trans1ation in opposite direction of the first to close the second mold part.

 By way of non-limiting example, there is shown in the accompanying drawing, an exemplary embodiment of a device according to the invention, a drawing in which the single figure is a diagrammatic view in vertical section of the device associated with a boot injection press made of material plastic.

 As can be seen in the drawing, the two sole blocks 1,2 are carried by a door 3 mounted vertically movable, by means of jacks 4 with a fixed station, and horizontally, by other jacks mounted on the mold holder. .

The injection holes 5,6 are parallel and horizontal.

The door 3 is provided with a hooking stud 8 intended to lock it, in the high position, on the mold holder. In the low position, the door 3 is mechanically abutted. In the example shown, the door cooperates with a mold for boots with a sole in two layers. The mold consists of two shells 9,9 'and a rod 10, and it is mounted in a mold holder 11, against which the jaws 12,12' of the press come to apply at the time of injection. .

 the mold holder has a housing 13 in which the stud 8 of the door 3 is hooked.

 In the position shown in the figure, it is the upper sole block 1 which bears against the shells 9, 9 'of the mold. After injection through hole 5, the first layer of sole is molded. It is shown in cross-hatched lines in the figure.

 the door 3 is then moved in horizontal translation, to release the block 1 from the mold shells, then it is moved, by the jacks 4, in vertical translation, to bring the block 2 into the position occupied by the block 1 the door 3 is then moved horizontally to bring the block 2 into contact with the shells and with the outline of the external face of the first sole layer which has just been molded. The stud 8 hooks into the housing 19 and the injection can take place, to form the second layer of sole

Claims (1)

Claim  Injection machine for the production of boots, the sole of which comprises at least two layers of different plastics, of the type comprising a device carrying at least two mold parts, or blocks, of profiles corresponding to the shape of the various sole layers, characterized by the fact that said device is constituted by a panel, or door, mounted movable in vertical and horizontal translations and carrying, on the same face, the mold parts, or blocks, intended for successive sole moldings, the holes of injection being parallel and perpendicular to said face0