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Патент USA US2108178

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Feb. 15, 1938.
s. E. ROSENBERG
2,108,178
APPARATUS FOR TRIMMING OR PINKING LEATHER OR THE LIKE.
Filed Feb. 24,. 1936'
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Féb. 15, 1938.
‘ s. E. ROSENBERG
2,108,178
APPARATUS FOR TRIMMING OR PINKING LEATHER OR THE LIKE
Filed Feb. 24, _l956
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2,108,178
Patented Feb. 15, 1938
UNITED’ STATES PATENT 'oFFicE.
2,108,178
APPARATUS FOR TRIMIVH‘NG OR PINKING
- LEATHER OR THE‘ LIKE‘
Stig E. Rosenberg, Brockton, Mass.
Application February 24, 1936, Serial No. 65,200
4 Claims. (Cl. Mil-23}
This invention relates to a method of and
apparatus for trimming marginal portions of a
piece of leather or the like, the trimming or
pinking cuts being such as to leave a beveled
UK
edge.
It is an object of the invention to provide
apparatus for cutting a non-straight marginal
portion of a piece of leather, such as a part for
a shoe upper, so that the entire portion to be
10 trimmed is operated upon with one stroke only.
It is another object of the invention to provide
apparatus by which a non-straight marginal
portion of a piece of leather may be pinked on
a bevel in such a manner that each of the scal
1
Mounted at suitable points on the base block 20
are gage pins 28. The pinking cutter 30 is in 10'
the form of a knife having a sharp cutting edge
following the con?guration of the bevel edge
23 of the supporting plate 22, the knife as shown
being integral with a horizontal back 3| which
15
rigidly maintains the blade 30 in its shape.
As indicated in Figures 2 and 3, the pinking
point.
knife 30 has a blade of uniform width (or height)
and of substantial thickness sufficient for the
formation of a zigzag cutting edge by V notches
or grooves in the side faces of the blade, the sur
face de?ned by the cutting edge having a sub
drawings of which
Figure 1 is a plan view of apparatus embody
ing the invention, designed for pinking a shoe
25 vamp.
Figure 2 is a side elevation of the same, a
portion being broken away to show in section.
Figure 3 is a section on the line 3—3 of Fig
ure 1, this view being. on a larger scale.
Figure 4 is a fragmentary portion of Figure 3
showing the parts in a different position of op
eration.
Figure 5 is similar to Figure 4, showing a fur
ther step in the operation of the apparatus.
35
pinked. As illustrated in Figure 1, the vamp 25
is of the well known wing-tip shape, the upper
or inner edge of which is to be pinked prior to
being sewed to other portions of the upper.
lops along the edge projects in a direction per
pendicular to the direction of the edge at that
Various other advantageous features of the in.
vention will be apparent to one skilled in the art
from a disclosure thereof in the description of
certain embodiments which follows, and on the
30
portion 23 which is shaped to conform to the
contour of the portion of the work which is to be
trimmed or pinked. By way of example, a shoe
vamp 25 is shown as the work which is to be
Figure 6 is similar to Figure 4 except that a
backing sheet is shown in addition.
Figure 7 is a fragmentary perspective view of
a marginal portion of a piece of leather or simi
lar sheet material after being operated upon ac
40 cording to the invention.
Figure 8 is a fragmentary sectional view of
apparatus for bevel-trimming leather or the like.
Figure 9 is a perspective view of a shoe vamp
having edge portions thereof bevel-trimmed.
stantially uniform bevel and being complemental
to the surface 23 of the work-supporting table 22.
As indicated in Figures 3 to 6, the knife 30
has a beveled cutting edge 32 conforming to the 26
bevel of the plate edge 23, so that, when the knife
descends in a cutting operation, the entire cut
ting edge simultaneously engages the bevel edge
23 of the supporting plate. As shown, the knife
may be secured to the under face of a suitable
plate 34 which in turn is mounted on a plural
ity of pillars 36, the pillars extending into suit
able cavities 38 in the block 28 and being pressed
upwardly by springs 41? in the cavities 38, as in
dicated in Figure 2. The plate 34 and the knife
back 3! are provided with suitable apertures 42
and 43 respectively, above the gage pins 28 so
as to permit the operator to see the pins and the
marginal portions of the work immediately in
contact therewith before the knife descends. The 40
operation of the pinking mechanism is indicated
in Figures 4 and 5. In using the apparatus, the
operator places a vamp or other piece of work
on the supporting plate 22 and pushes it until '
Figure 10 is a fragmentary View of apparatus
for bevel-trimming a piece of leather.
Figure 11 is a fragmentary perspective view
of a piece-of leather having an edge portion
it engages the several gage pins 28, sighting the 45
gage pins through the apertures 42 and 43 to see
that all are engaged by the work. Since the
trimmed on a bevel.
of the vamp to be pinked, this marginal portion
Referring to the drawings in detail, a die
suitable for carrying out the invention is illus
trated in Figures 1 and 2. As illustrated, this
in Figure 3.
die may consist of a base block 20 on which is
mounted a stationary supporting plate or table
22, the supporting plate having a beveled edge
bevel edge 23 conforms to the marginal portion
overhangs the bevel edge 23 as indicated at 46 50
The plate 34 with the knife V3!‘! is
then caused to descend by any suitable means so
that the knife 30 engages the overhanging por
tion 4.6 of the work. This overhanging portion
is thus pushed ‘down out of the plane of the 55
2
2,108,178
work, as indicated in Figure 4, so that all por
tions of the marginal part to be pinked are at
an angle to the plane of the work. Further
descent of the knife 30 causes the cutting edge
to penetrate through the bent marginal portion
46, as indicated in Figure 5. It is evident from
this ?gure that the knife 30 cuts the leather
at an acute angle to the surface thereof, thus
making a bevel cut.
In pinking a marginal por
portion of the leather at a relatively small angle
with the face of the leather, such a out being
somewhat similar to a skiving cut, as indicated at
16 in Figure 11.
It is evident that various modi?cations and
changes may be made in the invention as herein
shown and described without departing from the
spirit or scope thereof as de?ned in the following
claims.
10 tion of a vamp‘ or other part of a shoe upper,
it is desirable that each of the scallops or ser
10
1. A pinking die comprising a horizontal sup~
rations along the edge project in a direction
porting table for a piece of leather, said table
perpendicular to the edge of the leather at that
point, that is, in the direction of the radius of
15 curvature of the edge at such point. To this
end the pinking knife 36 may be constructed as
having a beveled edge portion similar in contour
to the edge portion of the leather to be trimmed,
gage pins engageable by said edge portion of the
leather, means supporting said gage pins adja
cent to said beveled edge portion of said table,
a knife-supporting plate yieldingly mounted over
said table, a knife mounted on the under side of
said plate, and means guiding said plate so that
downward movement thereof brings said knife
into contact with said beveled edge of the table,
indicated in Figure 1 so that the scallops, serra
tions, or other individual projections along the
edge will extend in the proper directions, as
20 indicated in Figure '7, wherein are shown a series
of serrations 158 arranged along a curved edge,
each of the serrations extending in the direction
of the radius of curvature of the edge at that
point.
r
said plate having apertures therethrough above
said gage pins to permit sighting of said pins
The supporting plate 22 is preferably of some , and the portions of the work adjacent thereto.
2. A die for bevel-trimming or pinking leather
relatively soft metal such as brass or aluminum,
so that, if the knife 30 cuts into the face of the
bevel edge 23 slightly, the cutting edge of the
knife will not be injured.
In some cases, it may
39,, be desirable to provide a backing layer to overlie
the supporting plate 22 and to receive the cutting
edge of the knife after it has penetrated through
the marginal portion 46 of the leather or other
piece of material to be trimmed or pinked. Such
35 a backing layer is indicated at 50 in Figure 6.
It may be made of any suitable material such as
a ?brous sheet having sufficient elasticity to give
properly without cracking or buckling along the
marginal portion when the margin is bent down
or the like, comprising a base, a wor —supporti_ng
table secured on said base, said table having a
beveled edge portion, a knife-supporting plate
mounted above and resiliently supported by said
base, and a knife secured to and projecting down
from said supporting plate, the cutting edge of
the knife having a shape corresponding to the
shape of said beveled edge portion of said table.
3. A die for bevel-trimming or pinking leather
or the like, comprising a base, a work-supporting
table secured on said base, said table having a
beveled edge portion, a plurality of gage pins
mounted on said base adjacent to said beveled
as indicated at 52.
Figure 9 illustrates a shoe vamp 55 having an
edge portion 56 cut on a bevel. As shown, this
shoe vamp may also have decorative perfora
edge portion, a knife-supporting plate mounted
above and resiliently supported by said base, said
tions 58 with beveled edges, the perforations hav
projecting down from said supporting plate, the
45 ing preferably been previously punched as at 68
before the edges thereof are trimmed. The bev
eled edges may be cut by means of a die similar
to that illustrated in Figures 1 and 2 except that
the knife 62 has a shape suitable for the desired
bevel out instead of being provided with scallops
or a zig-zag edge as shown in Figure 1.
Figure 10 illustrates a support plate 10 having
a relatively steep beveled edge 12. A knife 14 is
mounted in the manner indicated in Figures 1
in U! and 2 so as to push the marginal portion 46 of a
piece of leather out of the plane of the piece and
against the bevel surface 12.
The knife then
descends to make a bevel cut on the marginal
plate being provided with sighting apertures
above said gage pins, and a knife secured to and
cutting edge of said knife having a shape corre
sponding to the shape of said beveled edge por
tion of said table.
4. A pinking knife for bevel-pinking shoe upper
parts, said knife comprising a blade of uniform
width and substantial thickness shaped to corre
spond to the edge of the work to be pinked, the
upper and lower edges of said blade being dis
posed respectively in parallel horizontal planes
when the knife is in use, said lower edge being
formed with a zigzag cutting edge de?ning a ;
bevel surface at a constant angle to the vertical
throughout the length of the knife.
STIG E. ROSENBERG.
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