IMPROVEMENTS IN SKIVING AND TRIMMING MACHINES TO BE USED IN THE MANUFACTURE OF LEATHER
Year: 1883

page_text: LETTERS PATENT to William Robert Lake, of the firm of Haseltine, Lake
& Co, Patent Agents Southampton Buildings, London for an Invention of
"IMPROVEMENTS IN SKIVING AND TRIMMING MACHINES TO BE USED IN THE
MANUFACTURE OF LEATHER" Communicated to him from abroad by
Freeborn Fairfield Raymond of Newton, Massachusetts, United States of
America
COMPLETE SPECIFICATION filed by the said William Robert Lake at the
Office of the Commissioners of Patents on the 21st March 1883.
WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, and C Patent
Agents, Southampton Buildings, London, "IMPROVEMENTS IN SKIVING AND
TRIMMING MACHINES TO BE USED IN THE MANUFACTURE OF LEATHER"
municated to me from abroad by Freeborn Fairfield Raymond of Newton,
Massachusetts, United States of America
com-
This invention relates to machines used in the manufacture of leather and
particularly to that class known as skiving machines.
The said invention comprises improvements in the feed mechanism, in the cutting
or skiving device, and in the guiding mechanism, and is adapted to cut or skive
the material fed through it, at an angle to the plane of the lower feed roll, so that
the edge of the said material is thinned or reduced in thickness from a point or line
some distance from the edge. The length of this cut, skived, or trimmed portion
may be varied according to the inclination and width of the cutter.
In the accompanying drawing
Figure 1, is a front elevation of a machine constructed according to this
invention.
Figure 2, is a detail view drawn to an enlarged scale, and shewing the means for
vertically adjusting the cutting disc.
Figure 3, is a sectional plan shewing the means whereby the inclination of the
cutting disc is varied and its position in relation to the feed roll changed.
Figures 4, 5, 6 and 7 shew the variations in the position of the cutting
.....
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page_text: disc in relation to the feed mechanism obtained by the adjustments hereinafter
described.
Figure 8 is a sectional view of the cutting disc detached.
The feed mechanism consists of the feed roll A having preferably a smooth
portion a and a roughened portion a¹ of a different diameter from that of the smooth
portion (the said roll being carried at the end of the horizontal shaft a² supported
in suitable bearings in the frame A¹ of the machine and rotated as hereinafter
described) and the disc B, which preferably consists of a thin metal plate having a
roughened undersurface b, supported at the lower end of a yielding shaft b which
is arranged out of the perpendicular sufficiently to bring the outer edge of the
disc B in closer proximity to the surface of the feed roll A than any other part
thereof
The edge of the disc B projects over the portion a¹ of the feed roll but not over
the portion a.
The said disc is positively rotated, as hereinafter described, and its
shaft is supported on bearings in the bracket a³. A collar b², a spring b³, which
bears against the under surface of one portion of the bracket a³, and a collar b' keep
the disc in contact with the work, and at the same time permit a sufficient vertical
movement of the disc for variation in the thickness of the stock or material
skived.
Above and behind the feed mechanism is the cutter C which is preferably a disc
having a long thin cutting edge. The said cutter is also adapted to be rotated, and
is so supported and arranged in relation to the feed roll and feed disc, that its
cutting edge lies over the central vertical line of the said feed roll and feed disc as
shewn in figure 4.
The shaft c of the cutting disc is supported by the hinged block c', and is also
somewhat inclined from a vertical line, so that the plane of the cutting dise
intersects the plane of the portion a of the roll A.
The guiding mechanism consists of the curved edge-guide D which laps over the
portion a of the feed roll A and is not only curved upon its guiding surface as
shewn, but also upon the under surface to conform to the surface of the roll. It is
supported by the plate or arm d provided with a slot d' by means of which, and the
screw d², it may be moved upon its supporting bracket or table d³ thereby moving
the guide laterally upon the feed roll.
Immediately above the feed roll A and extending from the guide D transversely
across the same is the presser E.
This presser has a rounded or curved under surface e, and is supported upon the
end of the yielding or spring arm e¹ which is fastened to the plate carrying the
guide and is therefore adjustable with it."
The feed roll shaft has inounted upon it a bevel gear wheel at which engages
with the bevel gear wheel a³ on the short vertical shaft a° which carries the worm
wheel a at its upper end engaging with the worm as upon the main shaft a³.
The main shaft also carries the bevel gear wheel a which engages with the
bevel gear wheel all upon the upper end of the cutting disc shaft, and the worm a¹³
which engages with the worm wheel a¹³ upon the upper end of the feed disc
shaft.
In order that the machine may be adjustable it is necessary to support the cutting
disc in such a manner that its inclination in relation to the feed roll may be varied
to govern the extent or length of the cut made, that the position of its centre in
relation to the feed roll be variable at will in order that it may be moved toward
the feed roll as the disc becomes worn by sharpening, and that it be made adjustable
as to its height in relation to the feed roll to govern the thickness of the cut or
skived portion.
The first adjustment is obtained by providing the block c¹ with a movement
upon its centre c². This is done by loosening the screws c³, c, moving the block
upon the centre c² sufficiently to bring the disc to the desired inclination, and then
tightening the screws.
The second adjustment is obtained by hinging one part of the block to the other
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page_text: so that upon loosening the screws c², c³ and moving the disc towards the guide D
and then tightening the screw c³ the cutting disc may be moved forward.
The third adjustment is obtained by means of the yoke c which engages with
the collar con the cutter shaft and the screw co which is supported by the arm c
and engages with a nut c upon the yoke-For the purpose of strengthening or
stiffening this part a guide plate c may be attached to, or from a part of, the
yoke and pass through recesses having covering plates formed in the back of
the block c'.
By moving the screw it is obvious that the cutting disc is raised or lowered
according as the screw is turned.
In lieu of the feeding mechanism described any other suitable device or devices
for presenting the material to the cutter may be employed.
In lieu of the guiding mechanism and presser shown any suitable equivalent
therefore may be used. And in lieu of the methods for providing the cutter disc
with the adjustments herein indicated, any suitable mechanical equivalents therefor
may be adapted without departing from the nature of the said invention.
The cutting disc as above stated should have a long thin edge made slightly
concave on its upper surface and also upon its under surface, the former to make
the blade thin and the latter to provide for the easy and true sharpening thereof,
as by making it a little concave when it is placed upon the grinding wheel the
extreme or cutting edge of the disc is brought in contact therewith and if so placed
that all portions of the edge bear upon the wheel at one time the entire edge is
uniformly sharpened.
In operation the operator presents the end of the material to be skived or
trimmed to the feeding mechanism with the edge to be trimmed or skived in
contact with the guide, and the feed roll and disc advance it rapidly to the
revolving cutter which removes a thin skiving the width of which can be varied at
will. The presser holds the material to the lower feed roll. The operator can so
guide the material as to skive the edge of any curve or irregular shape, and by
means of the adjustments described he may remove narrow or wide skivings and
thin the edge of the material to a greater or less extent as may be desired.
Having thus fully described the said invention as communicated to me by my
foreign correspondent, and the manner of performing the same, I wish it understood
that I claim.
First A skiving or trimming machine having a revolving cutter arranged
transversely to the line of the feed, and mechanism for feeding the stock or material
thereto, all substantially as described.
Second The combination in a skiving or trimming machine, of feed mechanism
consisting of a revolving roll and a revolving disc having the relation to each
other as shown and described, with a cutting or trimming device, all substantially
as, and for the purposes, setforth.
Third The combination of the feeding mechanisin and cutting or trimming
device substantially as described, with an edge guide D all substantially as, and for
the purposes described.
Fourth The combination of the feeding and the cutting or trimming mechanism
described, with a presser E all substantially as, and for the purposes, setforth.
Fifth The combination of the feeding mechanism, the cutter, and an edge guide
transversely adjustable in relation to the feeding mechanism, substantially as, and
for the purposes, described.
Sixth The combination of feeding mechanism substantially as described, a
revolving cutter, and means for moving it vertically in relation to the feeding
mechanism, all substantially as setforth.
Seventh The combination of the feeding mechanism substantially as specified,
the revolving cutter, and means for varying its inclination in rela.ion to the
feeding mechanism, all substantially as, and for the purposes, setforth.
Eighth The combination of the feeding mechanism, the cutter, and means for

page_text: moving it to and from the feeding mechanism, all substantially as, and for the
purposes, setforth.
Ninth The combination of the feed roll having the surfaces a a³, the disc
arranged in relation to the feed roll as specified, the cutting disc, and means for
positively revolving the roll and discs in the same direction, all substantially as,
and for the purposes, described.
Tenth A machine for skiving and trimming containing the mechanism herein
specified, or any mechanical equivalent therefor, or any sub combination of the
elements thereof, all substantially as described.
Eleventh The cutting disc shaped substantially as, and for the purposes,
setforth.
In Witness whereof I the said William Robert Lake have hereunto set my
hand and seal this twenty-first day of March in the year of our Lord One
thousand eight hundred and eighty three.
W ROBT. LAKE (L.S.)