US2683975A - Shield for leather skiving machines - Google Patents

Description

July 20, 1954 H. REMELIUS 2,683,975

SHIELD FOR LEATHER SKIVING MACHINES Filed June 16, 1952 2 Sheets-Sheet l FIG.I

GENT

July 20, 1954 H. REMELIUS SHIELD FOR LEATHER SKIVING MACHINES 2 Sheets-Sheet 2 Filed June 16, 1952 5 FIG. 4.

.LIIIII'UIIIIIIIZI Patented July 20, 1954 2,633,975 SHIELD FOR LEATHER SEWING MACHINES Hermann Remelifis, Beihingen (Neckar), Germany, assignor to Fortuna-Werke Spezialmaschinenfabrik A.-G., Stuttgart-Bad Cannstatt, Germany Application June 16, 1952, Serial No. 293,766

Claims priority, application Germany June 16, 1951 3 Claims. 1

The present invention relates to improvements in leather skiving machines.

In leather skiving machines of the prior art the cutting edge of the cylindrical cutter was protected against inadvertent touching, but the cylindrical part of the cutter was fully exposed through an aperture in the area intermediate the cover surface and the adjoining front end of the machine. With increasing wear of the cylindrical cutter the gap between the bottom plane thereof and the opposite edge of the aperture becomes greater, so that blanks, particularly of small size, frequently slip into this gap and are lost. The present invention is intended to overcome this shortcoming.

In accordance with the invention a shield plate which encompasses the cylindrical cutter is raised up into the proximity of the presser bar, i. e. the operating zone of the machine and is closely approached to the surface of the cylindrical cutter or to the cutting edge.

With its ground edge which faces in the direction of the cutting edge of the cylindrical cutter, the shield plate follows the curvature of the cutter so closely that, while it does not touch it, even the thinnest blanks are prevented from sliding between the cylindrical cutter and the shield plate. Furthermore, the distance between the cylindrical cutter and the shield plate is such, and increases in the direction of rotation of the cylindrical cutter, that the formation of wads from circulating particles of material which could lodge there and adversely affect the performance of the machine is avoided to the greatest possible extent.

Furthermore, to prevent scraps of material being carried upwardly, a scraper is provided on the inner side of the shield plate which rides resiliently on the outside of the cylindrical cutter, facing in the direction opposite to the direction of rotation of the cylindrical cutter, thus scraping off adhering particles which have been carried along by the cylindrical cutter. In this manner it is avoided that within an undesirably short period of time small particles lodge in the idle spaces between cutter and frame and gradually exert a braking elfect on the rotating cutter. Thus cleaning of the machine need only be undertaken at considerably greater time intervals than heretofore.

The special advantages resulting from the use of the new shield plate are that the plane of the machine which is located behind the cutting edge of the cylindrical cutter in the direction of operation can be used as a table top and storage space for small blanks. It is thus unnecessary for the operator to deposit each blank separately outside of the range of the machine. The plane serves also as a support for the hand of the operator, so that the guidance of the blank is safer, the quality of the work better and the total output is increased. In addition, insurance against loss of the blanks is obtained and the appearance of the machine is enhanced inasmuch as it makes a more compact impression. Finally, the shield plate prevents blanks from bein soiled by oil which is sprayed around by the shaftof the cylindrical cutter or other components which rotate under the table top.

Further advantages of the invention will become apparent from the following description and the accompanying drawings in which Fig. 1 shows a front perspective View of a skiving and splitting machine;

Fig. 2 is a view of a shield plate from the top of the machine;

Fig. 3 is a View of the shield plate from the front side of the machine;

Fig. .4 is a partial sectional view of the shield plate taken along line IV-IV of Fig. 5, indicating the relative position of the shield plate, the

cylindrical cutter, the feeding roller, the presser bar and part of the housing;

Fig. 5 is a vertical cross section through the shield plate, cylindrical cutter, feeding roller and presser bar along line V-V of Fig. 4;

Fig. 6 is a sectional cut through the shield plate and cylindrical cutter along line VI-VI of Fig. 4.

In the machine illustrated the power transmission and gearing components as well as the cutter are disposed in a housing, the upper portion of which constitutes a table surface upon which the finished products may be placed. The tool is a cylindrical cutter, the largest part of which is accommodated inside the housing with only a small sector projecting through an aperture slightly above the plane of the table. The material to be skived is fed to the cutter by way of a feeding roller which is partly disposed inside the cylindrical cutter and cooperates with a presser bar disposed on the opposite side of the cutter and carried by an arm secured to the housing. The curvature longitudinally of the roller corresponds substantially to the arc of the inner diameter of the cutter While the guiding plane of the presser bar may be adapted to the outer curvature of the cutter but may have different conformations, projections or grooves.

In View of the dimensions of the housing having been chosen as small as possible, in order to provide for a small machine, it was necessary to make the opening in the operating area comparatively larger than in other similar skiving machines to achieve improved design, more convenient assembly and reliable operation. It was then necessary to close the relatively larger aperture.

The cylindrical cutter l is almost completely shielded against the outside by shield plate 2 which has a recess only in the working area 4 adjacent the presser bar 5, thus safeguarding unendangered working with the machine. The edge ii of the shield plate 2 is somewhat sharpened and brought so closely to the curvature of the cylindrical cutter that while it does not touch the cutter it nonetheless prevents even the thinnest blanks from Sliding between the cylindrical cutter and the shield plate.

In this working area the space between the shield plate 2 and the cylindrical cutter I can be adjusted to the desired magnitude by means of fastening screws [2 which secure the lower end of the shield plate 2 to the front side of the housing of the machine. The shield plate is of sufficient width to cover the aperture IT in the work table [3 formed by the housing, which serves for exchanging the cylindrical cutter, thereby covering also the space between the bottom plane ll of the cylindrical cutter and the work table [3 in a manner that the edge 10 of the shield plate extends in alignment with the work table 13.

On the inside of the shield plate 2 a scraper 3 is secured, for example; by means of screws 1, the edge of which abuts the cylindrical cutter and slides on it, thus scraping off all adhering particles.

The blanks to be worked on are seized by the feeding roller [4, pulled through under the presser bar 5 and pushed against the cutting edge 9 of the. cylindrical cutter l. The work blank slides over the shield plate 2 onto the work table 13 while the waste drops first into the hollow of the cylindrical cutter and thence into a collecting container.

At its upper end I5 the shield plate is set flush into the work table plate 13 and secured thereto by means of screws 16.

The increase in space between the shield plate 2 and cylindrical cutter I referred to above can best be seen in Fig. 4 of the drawings. Inasmuch as the radial center for the curvature of the shield plate is slightly displaced in the direction of the presser bar with respect to the line VIVI in Fig. 4 a constantly increasing space between the cutter and the shield is attained in the direction of rotation of the cutter from point A towards point B. This prevents the accumulation of waste material in that space. Any adhering particles which do not drop off the outer surface of the cylindrical cutter are removed by the scraper 8 as above indicated.

Having now described the nature of my invention and the manner of carrying it out in practice, what I claim is:

1. Shielding means for the cylindrical cutter of leather skiving machines of the type having a housing enclosing the cylindrical cutter and presenting a continuous surface, and a presser bar, said housing including a portion defining a work table and having an aperture extending around a segment of the cutter, and said shielding means comprising a curved shield plate disposed in said aperture in alignment with said continuous surface and having a curved edge extending in close proximity to the exposed cutting edge of the cylindrical cutter.

2. Shielding means for the cylindrical cutter of leather skiving machines of the type having a housing enclosing the cylindrical cutter and presenting a continuous surface, and a presser bar, said housing including a portion defining a work table and having an aperture extending around a segment of the cutter, and said shielding means comprising a curved shield plate disposed in said aperture in alignment with said continuous surface and having a curved edge extending in close proximity to the exposed cut ting edge of the cylindrical cutter, the curvature of said curved edge and said shield plate varying slightly from the curvature of the cylindrical cutter to increase the distance therebetween the direction of rotation of the cylindrical cutter.

3. Shielding means for the cylindrical cutter of leather skiving machines of the type having a housing enclosing the cylindrical cutter and presenting a continuous surface, and a presser bar, said housing including a portion defining a work table and having an aperture extending around a segment of the cutter, and said shielding means comprising a curved shield plate disposed in said aperture in alignment with said continuous surface and having a curved edge extending in close proximity to the exposed cutting edge of the cylindrical cutter, and a scraper device secured to said shield plate and extending transversely of the outer cylindrical surface of the cutter and having frictional engagement therewith, said shield plate including adjusting means adapted to vary the spacing of said shield plate relative to the cylindrical cutter.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 247,648 House at al. Sept. 27, 1881 1,069,684 Felix Aug. 12, 1913 1,079,462 Alexander Nov. 25, 1913 1,672,147 Baxter June 5, 1928 FOREIGN PATENTS Number Country Date 421,928 France Jan. 5, 1911

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