DE4143293A1 - Leather softening and milling - includes using paired rotating shafts with eccentric discs for leather moving between them - Google Patents

Abstract

To soften and crumple and/or mill leathers or hides and the like, the material is fed between rotating shafts with raised and recessed sections as eccentric discs. They apply a milling or milled graining to the material. The rotating shafts have a tumble projection and recess structure through disc-type assemblies, with leather carrying elastic belts arranged to pass alternately round the shafts to give a number of milling points. The milling shafts are in pairs at each milling point, rotating against each other in synchronisation, while the gap between the two rotating eccentric or tumble eccentric discs remains constant. The milling effect is applied when the gap between the raised sections of the discs is at its narrowest to move the points (P1,P2) to and fro in relation to the direction of leather travel. The leather material follows this movement directly or indirectly through the applied friction. ADVANTAGE - The method allows small quantities to be processed with effective softening and surface appearance, even at the edges of small leather sections, for immediate use.

Description

The current state of the art is a "millen" of leather in barrels or drums. Here pieces of leather are in themselves rotating barrels soft-milled.

The typical surface structure is created on the leather so-called "mill grain".

It is also known to use leather in stud machines such. B. the "Molissa" by Svit or Vibrasoft by Kela in the run method to softly roll between two elastic bands. There is no typical mill grain.

The millen in barrels has the disadvantage that you don't have small ones series can be milled as required, and that no small parts after punching or dressing with gu result can be grilled because there is a lack of Do not bend the edges of the leather.

Stud machines have the disadvantage that no typical mill grain occurs on the grain side, and that the leather during the tunnel is under tension, which is only a conditional Allows softening.

The claimed milling machine does not have these disadvantages! The leather is loaded with suitable technical measures in a ruffled or corrugated form with an excess of material, which reduces the tensile forces when rolling in the leather (compression effect)
The advantages are:

• - optimal softness
• - Possible application in Continuous process
• - Post-mothers or intermediate mothers before further processing
• - Immediate availability of the ge millten leather
• - Good mill effect also in the edge area of small leather parts

The mill machine can be designed so that the mill effect influenced by changing the center distances of the mill rolls can be. Different leather thicknesses can also be created be taken into account.

The machine loads both in a continuous process and in Forward and reverse operation (double mill process with the same Apply Millwave Number).

Axial or linear misalignment of the mill rolls can result in a higher uniformity can be achieved.

The number of mill rolls is arbitrary.  

Embodiments

Fig. 1 pair of eccentric rollers without elastic conveyor belt. An embodiment of Fig. 1 with elastic transport bands is possible. (The drive has been omitted for reasons of clarity.)

Fig. 2 swashplate eccentric mill roller pair without elastic conveyor belt. An embodiment of Fig. 2 with elastic transport bands is possible.

Fig. 3 version with five conveyor belt deflection rollers and six mill rollers. The center distance of the mill rolls can be changeable. It was shown enlarged for the sake of clarity in relation to other drawing parts in Fig. 3.

It shows
Pos .: 1 + 3 + 5 = deflection rollers upper conveyor belt
Pos .: 2 + 4 = deflection rollers lower conveyor belt
Pos .: 6 to 11 = mill rolls
Pos .: 12 = lower elastic conveyor belt
Pos .: 13 = upper elastic conveyor belt

The following mill points result:
No. 1: between items 7 and 8
No. 2: between items 8 and 11
No. 3: between items 10 and 11
No. 4: between pos. 10 and 7
No. 5: between items 7 and 6
No. 6: between items 6 and 9
No. 7: between items 10 and 9

Explanation of Fig. 4:
Pos. 1 = eccentric 1 ; Pos. 2 = eccentric 2 ;
P1 = point 1
P2 = point 2

When rotating the two eccentric neighbors items 1 and 2 around the common shaft axis to 180 °, item 1 moves from item 1 on the linear plane AB to the position of item 1 '. The original point 2 of item 2 shifts to point 2 '.

The points P1 and P2 of the eccentric pos. 1 and pos. 2 overtake each other after half a revolution of the mill shaft on the linear transport plane AB by the amount of the common eccentricity.

There is a back and forth effect between an ex center and the eccentric neighbor on the linear transport plane A-B, which is a mill or walk justified effect.

Claims (6)

1. A method for softening, tunneling and / or millen of leather, skins or the like, characterized in that the material between rotating shafts with excenter disk-like elevations and depressions (mill waves) is transported through, and thereby a mill or fulling effect (mill grain). 2. Process for softening, studding and / or millen of leather, Skins or the like, characterized in that the material between rotating shafts with swashplate eccentric Elevations and depressions through (mill waves) transpor is tiert and this results in a Mill- or Walkeffekt. 3. Process for softening, treading and / or milling leather, Skins or the like, characterized in that the material between rotating waves with swashplate-like ridges is transported through (mill waves), and there by a mill or whale effect. 4. Apparatus for performing the method according to claims 1-3, characterized in that the arrangement of the mill waves by mutual wrapping with elastic conveyor belts which results in a favorable number of mill or flex points. 5. Apparatus for performing the method according to claims 1-3, characterized in that the mill waves each on the Mill or flex points in pairs so oppositely synchronously lukewarm fen that the distance between each converging Eccentric discs or swash plate eccentrics essentially stays the same.   6. Device for performing the method according to claims 1-3, characterized in that a mill or walk effect that occurs when you look at the points of the shortest Removal of the eccentric or swashplate eccentric distances considered to each other, a reciprocation of the points P1 and P2 with regard to the direction of transport of the leather there, the leather in between, which is by the Rei exercise is directly or indirectly connected to these points, join in this movement.