This regards a milling, dyeing and tanning drum, which is characterised in that humidified air is diffused inside the drum, rather than atomised water as in the case of similar devices of known type. In particular, according to a preferential embodiment of the finding, it is foreseen that the humidity value of the air sent inside the drum is regulated through a dehumidification group placed outside the drum itself.

An improved perching machine, in particular for softening and stretching industrial hides or the like, comprises at least one first section (5) and at least one second section (5') operationally coupled and located downstream of the first section; each section (5; 5') is formed by at least one pair of mutually facing conveyor belts (6, 7; 6', 7') for retaining and conveying the hides (P) and by at least one pair of plates (10, 12; 11, 13; 10', 12'; 11', 13') substantially parallel to the belts (6, 7; 6', 7') and acting on opposite sides thereof for softening and stretching the hides. The pair of conveyor belts (6', 7') of the downstream section has a feed speed (V') greater than that (V) of the pair of belts (6, 7) of the upstream section (5). Each section (5; 5') comprises independent motors (20, 20') operating a respective pair of conveyor belts (6, 7; 6', 7') so as to impart varied speeds (V', V) thereto. The ratio (V'/V) between the feed speed of the pair of belts of the downstream section and the speed of the pair of conveyor belts of the upstream section is between 1 and 4 and preferably equal to about 1.2. The advantage of exerting a greater stretching force on the hides in the longitudinal direction when passing from one section to the next one is obtained.

A method for the automatic nondestructive mapping of the elasticity of hides for manufacturing use, which comprises dividing the entire hide (A) into a plurality of contiguous bands (B) and each one of the bands (B) into a plurality of small regions (C) having a small surface, and subjecting the small regions (C) to a deformation below the assured elasticity limit, measuring the extent of the deformation and of the deforming force applied, processing the measurements of the extent of the deformation and of the deforming force, and recording the set of data computed from the measurements of the extent of the deformation and of the deforming force.

The apparatus for carrying out the method.

A method for the automatic nondestructive mapping of the elasticity of hides for manufacturing use, which comprises dividing the entire hide (A) into a plurality of contiguous bands (B) and each one of the bands (B) into a plurality of small regions (C) having a small surface, and subjecting the small regions (C) to a deformation below the assured elasticity limit, measuring the extent of the deformation and of the deforming force applied, processing the measurements of the extent of the deformation and of the deforming force, and recording the set of data computed from the measurements of the extent of the deformation and of the deforming force.

The apparatus for carrying out the method.

A device for automatically adjusting the staking pressure in staking machines with beating plates, wherein the machine includes at least one fixed plate (5) and at least one moving plate (4) which face each other and are provided with complementarily shaped tools; the fixed plate (5) is installed on threaded posts (11) which can be screwed in complementarily threaded bushes (12) which are rigidly coupled to a bed (3); there are locking devices (13) which act selectively on the fixed plate (5). The device includes at least one servomechanism (16) which is rigidly coupled to the fixed plate (5) and is connected to the threaded posts (11) for their automatic rotation; sensor devices (23) for detecting the value of the maximum penetration of the tools and for generating a first electrical signal; electronic control devices (24) for comparing the first electrical signal with a second presettable electrical signal which corresponds to the intended staking pressure and for continuously adjusting the power supply of the servomechanism. The servomechanism (16) consists of a gearmotor which is connected to the threaded posts (11) by virtue of a toothed belt and a chain.

L'invention concerne un palisson dans lequel la plaque mobile (2), dis­posée au-desous de la plaque fixe (1), est animée d'un mouvement alter­natif dans le sens vertical par le moyen de plusieurs paires de tiges (5′ et 5˝), dans chacune desquelles la tige inférieure (5˝), articulée (en 6) à la structure fixe (10), est reliée par une seconde charnière (7) à la tige supérieure (5′), cette dernière étant réunie par son ex­trémité opposée à la plaque (2) moyennant une autre charnière (8). Les paires de tiges sont mutuellement assemblées par un bras (11) auquel sont incorporées les charnières (7). Il est prévu un moyen pour le dé­placement alternatif du bras (11) et un élément de guidage (9) pour la plaque inférieure (7) qui permet à cette dernière de ne se déplacer al­ternativement que dans le sens vertical.

The invention solves an improvement of method and apparatus for area-stretching of leathers which re inserted between two resilient belts with which they are alternatively and cyclically either moved (fed between a set of deepenings and a set of pulling studs, wither stretched by causing of reversible shifting (pushing-in) of said pulling studs into said opposite depenings.

The improvement is reached as follows:

Before beginning of each stretching cycle both the resilient belts, commonly with treated leather, are mutually clamped, one opposite to the other, at peripheral places of the deepenings and before the resilient belts subsequently shift, their clamping is released. Between pulling studs (21) there are mounted resilient plates (22) and oppositely to them, on peripheries of the deepenings (30), there are provided contact planes (31r) which are parallel to the shifting plane (o) of the resilient belts (4, 5). Except these distinguishing signs of the present invention there exist also further possible variances.

The present invention can be used for area-stretching of leathers.

Device for softening leather products, particularly shoe uppers, comprising: at least a sealed container (1') containing a holder (19) for the product to be treated, an air pump, means feeding vapour or water nebulized with compressed air and ducts (15) and (16) connecting respectively said feeding means and air pump to the container.

The container (1') is provided, on the base, with a box (11) containing an electrical resistance, heating rods arranged on its periphery (13) and openings (14) and (16) connected to the air pump and to vapour or nebulized air.

The holder (19) may be a reticular support or a second container having an upper opening covered by a thick layer (24) of a compressible elastic material.

The invention relates to a process of treating workpieces consisting of hides, skins, pieces of leather or the like and is characterized by subjecting the workpiece in conjunction with a drying operation to lateral and longitudinal stretching by way of a stretching operation which comprises extension of an elastic conveyor belt (2) on which the workpiece is conveyed. The invention also relates to machine units which can be assembled to form complete treating plants and each of which is equipped with an elastic conveyor belt (2) for conveyance of the workpiece (8) and with means (5, 7) for providing, by extension and bending of the conveyor belt, a stretching and softening treatment of the workpiece, and preferably also with means (6) for drying or remoistening the workpiece.

This regards a milling, dyeing and tanning drum, which is characterised in that humidified air is diffused inside the drum, rather than atomised water as in the case of similar devices of known type. In particular, according to a preferential embodiment of the finding, it is foreseen that the humidity value of the air sent inside the drum is regulated through a dehumidification group placed outside the drum itself.

Gattungsmerkmale:

Einrichtung zur Durchlaufbearbeitung von Leder und ähnlichen Materialien, insbesondere Vibrations-Stollmaschine zur Flexibilisierung von Leder. Dabei ist eine Durchlaufbahn (DB) vorgesehen, die Transportmittel (TM) für das zu bearbeitende Leder (L) aufweist und an der mindestens ein Bearbeitungsbereich gebildet ist. Die Transportmittel (TM) umfassen mindestens ein umlaufendes Transportband (B1, B2) das wenigstens teilweise flexibel dehnbar ausgebildet ist.

Erfindungsaufgabe:

Schaffung einer Bearbeitungseinrichtung für Leder und dergl., die sich durch verbesserte Sicherheit gegen Durchlaufstörungen auszeichnet.

Lösungsmerkmale:

Es sind an dem Transportband (B1, B2) angreifende Querstreckungsmittel vorgesehen, die einen abschnittsweise in Transportrichtung divergierenden Verlauf der Band-Längskanten (LK) mit entsprechend zunehmender Bandbreite erzeugen.