Flow press, especially flow sammying machine, for the production

Details Flow press, especially flow sammying machine, for the production Flow press, especially flow sammying machine, for the production

1983-07-13

1986-10-21

Reynolds, Wm. Carter

Leather manufactures

Machines

Rotary tool

69 47, C14B 108, C14B 104

Patent

active

046178090

DESCRIPTION:

BRIEF SUMMARY
The invention concerns a flow press, especially a flow sammying machine for the production and processing of leather, with at least one pair of rolls under mutual pressure, the flow line of pieces of leather to be processed preferably being provided with at least one suction and/or conveyor belt. Such flow presses and especially sammying machines, are generally known, and are used for the pressing processes necessary in different stages of leather production and processing, especially those for removal of fluid from the leather. These work steps and the respective machines are of great importance, in their effectiveness and their capacity, to the quality of leather and, respectively, to the efficiency of the whole production process.
A sammying is generally necessary at least twice, in the leather production process, while special requirements are set, especially for the first sammying, as to the quality and water content of the leather. In any case, however, folds (creases) in the leather during the pressing process are to be prevented so far as possible, and also creases present before the pressing are to be removed, so far as possible. In known flow sammying machines, this stretching, which may have to be carried out repeatedly, has been carried out in a separate work step, and with corresponding separate devices, before the sammying. Also known in such sammying machines is the use of blade cylinders which press the leather to be sammied against the entrance-side conveyor or suction belt. These blade cylinders cause, essentially, just a more even lying of the leather against the entrance-side belt, but do not constitute a true stretching device. In any case, no substantial stretching and widening effect transverse to the flow direction, and thus no substantial reduction of creasing, is obtained in this way. In particular, the adhesive effect between suction or conveyor belts of the usual kind, on the one hand, and the leather pressed against them, on the other hand, opposes a relative movement between leather and belt transverse to the flow direction and thus an effective stretching and widening process.
The problem of the invention, therefore, is to provide a flow sammying machine which makes possible, without separate work steps, in the very same leather passage, a highly effective stretching and widening process, preceding the sammying. The solution of this problem, according to the invention, is distinguished, in a flow sammying machine of the kind mentioned, by at least one stretching device, arranged in the zone of the entrance wedge of the pair of rolls, acting at least partly transverse to the flow direction, which is designed to be adjustable between an open position allowing the introduction of the leather, and a working position with stretching tools acting on the leather.
Through such an arrangement of a stretching device, acting transverse to the flow direction of the leather, in the zone directly before the zone of the roll pressure, an intensive widening of the leather is obtained which, because of the slight distance of this stretching and widening zone before the subsequent flow pressing zone, is retained during the actual sammying and pressing process. The more or less strong contraction of the leather before entering the roll pressing zone, inevitable when the stretching device is located at a greater distance before the roll pressing zone is prevented thereby, and an outstanding freedom from creases is attained in the pressing process. At the same time, the adjustability of the stretching device between working position and open position makes possible an introduction of the leather, already loosely widened and free of coarse folds, into the work zone of the stretching device and the entrance zone of the rolls.
According to one preferred form of execution of the invention, the stretching device has, on at least one surface side of the leather, a stretching tool, at rest or moved opposite the flow movement, engaging, in the working position, in the entrance wedge of the pair of rolls.

REFERENCES:
patent: 619614 (1899-02-01), Quirin
patent: 989278 (1911-04-01), O'Brien
patent: 1075887 (1913-10-01), Whitney
patent: 1131756 (1915-03-01), Wayland
patent: 2297189 (1942-09-01), Ladner et al.
patent: 2330271 (1943-09-01), Cutler
patent: 2958989 (1960-11-01), Pendergast
patent: 3640105 (1972-02-01), Richter et al.
patent: 4055059 (1977-10-01), Dokoupil

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