US2803954A - Machine for continuously rolling bottom leather - Google Patents

Description

g- 1957 A. BuEK 2,803,954

MACHINE FOR CONTINUOUSLY ROLLING BOTTOM LEATHER Filed Sept. 26, 1955 2 Sheets-Sheet 1 IN VENTOR MMZMI Aug. 27, 1957 A. BuEK 2,803,954

MACEIINE FOR CONTINUOUSLY ROLLING BOTTOM LEATHER Filed Sept. 26, 1955 2 Sheets-Sheet 2 INVENTOR MACHINE FOR CONTINUOUSLY ROLLING BOTTOM LEATHER Adolf Bucek, Otrokovice, Czechoslovakia, assignor to Svit, narodni podnik, Gottwaldov, Gottwaldov, Czechoslovakia Application September 26, 1955, Serial No. 536,509

Claims priority, application Czechoslovakia September 27, 1954 2 Claims. (Cl. 69-43) The present invention relates to machines for the continuous rolling of bottom leather by means of a plurality of rolling discs.

Hitherto, bottom leather has been rolled on bridge-type rolling machines, wherein a cast iron disc with ground surface mounted in a carriage is imparted a reciprocating movement on the carrying structure of the machine. The leather placed on a steel plate is advanced by hand in a direction perpendicular with regard to the movement of the disc in such a way as to be successively rolled out evenly throughout its surface. The rolling of the leather is proceeding in stripes of the width of the rolling disc, i. e. 100 to 150 mm.

Although such bridge-type machines are working, in general, satisfactorily, they present nevertheless a number of drawbacks so that they are no longer suitable to fulfil all the up-to-date requirements of an increased productivity. Their chief disadvantage lies in their output being relatively small, chiefly for that reason that the rolling disc is to roll with its whole surface 8 to 10 times over the leather in both directions for a convenient treatment of the whole surface of the leather.

A further disadvantage consists in the necessity of the reciprocating movement of the carriage with the rolling disc of a weight of over 1 ton, on the carrying structure of the bridge. Therefore, a considerable input of power is required at any change of its movement both on braking and on re-starting its heavy mass. This leads to a heavy stress and premature wear of the drive and reverse mechanism.

A further drawback lies in the lack of safety of the attendance, as it is scarcely possible to provide the moving rolling disc with a reliable guarding device. Any shielding of the rolling disc is a hindrance for the supervision of the working post. Thus, the risk of accidents occurring is substantially increased.

The aforesaid drawbacks have now been eliminated by the arrangement according to the present invention consisting in that for the continuous rolling of the leather four or more rolling discs are used together with supporting cylinders and feed cylinders arranged alternately behind each other and side-byside in such a way that three of the rolling discs lying behind each other are laterally staggered whilst two rolling discs are running in the same axis side-by-side.

Further features of the object of the present invention are obvious from the following description relating to an embodiment given merely by way of example and illustrated in the accompanying drawing, wherein Fig. 1 shows a diagrammatic longitudinal section of the rolling machine,

Fig. 2 a diagrammatic top view showing the arrangement of the cylinders.

Referring now to the drawings, the rolling discs 2, 3, 4

United States Patent and 5 are mounted in the frame not .illustrated of the machine on shafts 7, 8, 9 and 10 running in bearings 11, 12, 13 and 14. Opposite these cylinders, thrust rollers 1 are arranged underneath (Fig. 1). Ahead of, and in between the rolling discs 2, 3, 4 and 5 and thrust rollers 1, pairs of feed (holding) rollers 6 are arranged so as to be pressed against each other from above by the effect of springs 15. The thrust rollers 1 are arranged in a well known manner continuously behind each other. The rolling discs 2, 3, 4 and 5 are arranged as shown in Fig. 2 alternately behind each other and side-by-side in such a way that the leather having passed through the machine in the direction of the arrow P (Figs. 1 and 2) is evenly and smoothly rolled out throughout its surface without leaving on the smooth face traces of stripes of the width of the rolling discs 2, 3, 4 and 5. The lower feed rollers 6 of each pair are turnable in fixed bearings whilst the upper feed rollers 6 are spring-controlled so as to be able to follow and equalize any unevennesses of the leather U resulting from drying. The feed roller pairs 6 are placed ahead of the first and the last of the supporting rollers 1 for the purpose of guiding the leather straightly and of holding it properly in place yet before the rolling operation and then in course of the rolling operation and after passing through the rolling discs 4 and 5 to leave the machine in a straight and proper condition.

The rolling machine above described operates as follows:

The leather U is inserted according to Fig. 2 between the first pair of feed rollers 6 in the direction of the arrow P. After having been inserted, the leather advances through the machine quite automatically, being treated by the rolling discs 2, 3 and 4 successively in its middle portion and thereupon both rim portions not illustrated of the leather U are rolled out simultaneously by the discs 4 and 5. The rear feed roller pair 6 thereupon pushes the finished leather out of the machine. On inserting another leather between the first pair of feed rollers 6 in the direction of the arrow P (Figs. 1 and 2.), the whole process of rolling is repeated.

A very important advantage of the arrangement of the rolling discs 2, 3 and 4 in series and of the discs 4 and 5 side-by-side consists in the fact that during the rolling operation the leather U is prevented from shifting sidewise. Thus the formation of traces in the shape of the longitudinal stripes of the Width of the rolling disc is avoided. The rolled out surface of the leather is entirely smooth and even and the rims of the leather treated remain undisturbed even by the exertion of the maximum pressure so that the quality of the leather is greatly increased. The rolling pressures are adjustable within a very wide range, from zero up to 1,500 kg. per cm. of the width dealt with. The machine can be operated by unskilled workers with absolute safety.

I claim:

1. Machine for continuously rolling leather, comprising four pairs of opposed working rollers to rotatably act upon leather fed between the rollers, all of the rollers rotating about parallel axes, two of said pairs being located centrally of the width of the work passage through the machine and being of such width as to act substantially on the center portion only of the leather, said two pairs being arranged to follow each other, when viewed in the feeding direction of the work, and to be laterally staggered and in laterally overlapping relation with respect to each other, the other two pairs of rollers being arranged to follow the first named two pairs, and located at the edge portions of the work passage, and acting substantially r-ltwopairsextending coaxially and being spaced axially upon the marginal portions only of the leather, said latter rolls both in advance of the first named two pairs and after the second named two pairs.

apart, each of the second named two pairs being in a laterally overlapping relation with ,respect to one of the first named two pairs.

2. In the machine according to claim 1, a pair of feeding rolls positioned between each two successive positions of working rollers, and atleast a single pair of feeding 2,538,086

References Cited in the file of this patent UNITED STATES PATENTS 2,399,819 Moore May 7, 1946 Dennison Ian. 16, 1951

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