Improvements in Leather Scarfing and Skiving Machines.
Year: 1887

page_text: Date of Application, 7th Nov, 1887
Complete Specification Left, 26th July, 1888
Complete Specification Accepted, 7th Sept., 1888
Improvements in Leather Scarfing and Skiving Machines.
I HUGO BREHNER of Plagwitz, Leipzig in the Empire of Germany Manufacturer
do hereby declare the nature of this invention to be as follows:-
This invention relates to machines for scarfing and skiving leather, and consists in
an improved machine for performing these operations-The machine consists of a
bed plate or table upon which the leather is laid, and of a rotary wheel or drum
having on its periphery a suitable number of knives arranged tangentially and
capable of adjustment in the line of their tangent. On the table of the machine is
a suitable rail over which the leather may be passed to be skived or scarfed by the
knives upon the rotating drum.-The table may also be provided with a slight
hollowing under the drum forming a portion of a cylinder the centre of which is
the axis of the drum-By feeding the leather through this hollowing the leather is
skived by the knives for an equal thickness over the surface of the hollow. I also
preferably dispose a spring finger before each knife on the drum to depress the
feather against the table and smoothe the same for the knife.
The leather may be skived or scarfed for a desired breadth by passing it obliquely
under the drum,
DL
LV-1007

page_text: I HUGO BREHMER of Plagwitz Leipzig in the Empire of Germany Manufacturer
do hereby declare the nature of this invention and in what manner the same is to
he performed to be particularly described and ascertained in and by the following
statement :-
This invention consists in an improved scarfing and skiving machine for leather and
the like.
Reference being made to the accompanying drawings. Fig. 1 is a sectional
elevation of the machine. Fig. 2 is a cross section thereof. Fig. 3 is a plan view.
Fig. 4 a diagramatic view illustrating the passing of a leather strip under the
skiving drum and the width of cut obtained corresponding to the angle of passage of
the leather. Fig. 5 is a detail view of a modification.
The machine consists principally of a bed plate or table over which the leather is
passed and of a rotary wheel or drum having on its periphery a suitable number of
tangential knives capable of adjustment in the line of tangent.
A suitable clamp is arranged to hold the leather firmly during the skiving or
scarfing thereof by the said knives. A spring finger or fingers are also arranged to
smooth the leather. A further improvement consists in hollowing the table below the
drum forming the same as a portion of a cylinder the axis of which coincides with the
axis of the drum so that the leather fed therein may be skived to equal thickness
throughout. Thus upon the bed plate of the machine is fixed the frame a extended to
form the bearings of the shaft c carrying the drum d. Upon a certain portion of
the periphery of the drum are fixed the tangential cutters e following each other in
sequence and each covering a certain breadth of the periphery of the drum. There
are preferably three cutters with inclined edges and arranged as shown in Figs. 1
and 3. To support the cutter, flat portions are cut on the periphery and the cutters
are held thereon by flat headed bolts passing through slots in the cutters.
g
The rear ends of the cutters are bent inward to form ears through which pass screw
spindles journalled in recesses in the drum so that the cutters may be moved back or
forth in the line of tangent by revolving said screw spindles for which purpose they
are provided with perforated heads as shown. A cross bar is provided to clamp
down the leather on the bed plato, the said bar is supported on the lower ends of the
two pillars carried by springs extending over the shaft c and fixed to the frame a
said springs normally hold down the bar g on the bed plate. To raise the bar after
passage of the cutters, cams are provided on the shaft c preferably integral with the
hub of the wheel d to lift blocks fixed on the under side of the springs.
C
с
Also to smooth down the leather before operation of the knives thoroof a spring
plate is fixed on the drum in front of the cutters.
Fig. 5 shows the table hollowed out as before mentioned; by this means an equal
slice may be cut off the leather for a considerable length or scarf as h may be cut
thereon. By displacing the bed plate or drum longitudinally relatively to each other
a very gradually tapering scarf may be cut,

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is,
1. The drum provided with tangential knives arranged relatively to each other on a
portion of the periphery of the drum substantially as set forth.
2. The means and method of adjustably fastening tangential cutters to a drum or
equivalent substantially as set forth.
3. The combination of a drum having tangential knives on a portion of its periphery
with bar g operated substantially as and for the purpose set forth.
4. The combination with a drum having tangential cutters on its periphery of a
movable or stationary bed plate having a hollowing substantially as and for the
purpose set forth.