Patent ID: 6312244
Filing Date: 2001-11-06
Classification: B29C,B29K,B29L

Abstract:
A plant (1) for continuously manufacturing foam products of unlimited length envisaged to form mattresses (2), and cushions comprising a foam material injecting device (4), placed in a first station (3), means for the laying of the foam material, each provided with a laying plane (12) of predetermined size, a vulcanizer (8), operating means of said laying means, removing means of the vulcanized product of unlimited length placed in a second station (5), a ring-like path where a plurality of laying planes are capable of moving along a fixed structure delimited by a first and a second stretch (10,11) joined at their ends by a third and a fourth stretch (16,17) shaped as an arc of a circle being respectively the third stretch (16) between the exit of the first stretch (10) and the entry of the second stretch (11) and the fourth stretch (17) between the exit of the second stretch (11) and the entry of the first stretch (10), in said first stretch (10) being provided the moving of the laying planes at a first speed from the first (3) to the second station (5) and in said second stretch (11) the taking back of the laying planes (12) downstream of the second station (5) towards the first station (3), wherein:a) the first stretch (10) is covered for its whole extension by a plurality of laying planes (12) placed side by side to each other and forming a continuous surface filled with foam material and the second stretch (11) is only partially covered by laying planes through its whole extension, said laying planes of the second stretch being devoid of foam material and the number of laying planes in the second stretch being lower than the ones of said plurality of the first stretch,b) said operating means comprises a first and a second operating system, different and independent of each other, the first operating system (33,34) giving a mechanical push to the plurality of laying planes (12) of the first stretch (10) in contact with each other from the first to the second station,c) the second operating system (50,51) transfers at a second speed higher than the first speed along the second stretch (11) the laying planes devoid of foam material toward the first station (3),d) the laying planes from the first station up to the exit of the third stretch are adjacent and mechanically linked in series,e) said laying planes after the exit of the third stretch and before the second stretch are mechanically disconnected from each other, the ratio between the speed of the second and the first stretch determining the presence of a laying plane at the first station (3) in correspondence of the exit of a laying plane at the second station (5).