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Патент USA US2116680

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May 10, 1938.
H. A. HAWKES
'
2,116,680
ROUNDING MACHINE AND KNIFE THEREFOR
Filed July 1, 1936
'
Q
Patented May 10, 1938
2,116,580
UNEED STATES PATENT QFFICE
a‘
2,116,680
ROUNDING MACHINE AND KNIFE THERE
'
FOR
Harry A. Hawkes, Chelsea, Mass, assignor to
United Shoe Machinery Corporation, Pater
son, N. J., a. corporation of New Jersey
Application July 1, 1936, Serial No. 88,427
5 Claims.
(Cl. 12——25)
Fig. 1 illustrates a particular form of the knife
of this invention, while
Fig. 2 shows the knife in place in the rounding
is rounded or cut by a knife to correspond to the ,
machine.
contour of a pattern.
In the Planet rounding machine, the relative
In sole-rounding apparatus, of which the well
cutting movement between a knife l0 and a
known Planet machine disclosed in Letters Pat
ent of the United States No. 882,009, Mayo, pattern 62, upon which a sheet of stock S is
March 17, 1908, furnishes an example, relative held by a clamp H, is effected by the travel of
This invention relates to machines by which
sheet-material, such as stock for insoles of shoes,
movement produced between a knife and sheet
10 material held against a pattern causes work
pieces to be formed by the knife under the guid
ance of the pattern.
As the machine is con
structed, it is entirely effective in its operation
upon even thin stock when this is ?rm in char
15 acter. But when it is soft and ?accid, as is cer
the knife, the pattern and clamp being stationary
during the rounding operation. This travel is '10
imparted to the knife from a rotary table it‘,
upon which is mounted for oscillation and bodily
movement a carrier-arm 18 having on its inner
extremity adjacent to the periphery of the pat
tern a holder 20.
In this holder the shank 22 of 15
tain insole-material, it tends to be displaced by
the knife H] is secured with the cutting edge 24
the action of the knife and to Wave or chatter.
in a substantially vertical position, the shank
portion of its ?at inner side 26 being guided in its
travel by contact with the periphery of the
pattern. The blade of the knife is provided with 20
a projection extending from it above the pattern.
The projection is preferably furnished by a block
28 having extending between its lower face 36
This results in an objectionably rough, irregular
edge upon the cut piece.
An object of the present invention is to obtain
20
a cutting action which will give a smooth edge,
even with thin, cheap stock. In the attainment
of this object, a knife is employed which has a
blade provided with an integral shank arranged
25 to be secured in the holder of a rounding ma
chine and a cutting edge extending from the
shank to the opposite extremity of the blade,
where it is provided with a projection entirely
surrounding it and arranged for engagement with
30 the margin of the sheet-material being operated
upon. With the knife in the machine, the mar
gin-engaging surface of the projection extends
along the work-contacting surface of the pattern
and towardthe clamp by which the work-sheet is
35 held against said pattern. The projection bear
ing upon the work inside the cutting edge of the
knife holds it ?rmly against displacement and
insures a clean cut. Since it is desirable to ob
tain substantially uniform pressure of the pro
40 jection against the work when the sheet differs
in thickness, said projection is preferably in the
form of a separate piece or block surrounding
the blade and which has means for securing it in
different positions along said blade. In the
rounding machine, there is thus altered the rela
tion of the work-engaging surface carried by the
blade to the pattern and therefore to the material
upon the pattern. To provide for the smooth
movement of the block upon the work and the
50 easy de?ection of the chip cut by the knife, por
tions of the work-engaging surface and other
portions of the block at the side toward the work
4
are inclined or relieved.
55
.
m
In the accompanying drawing,
and upper face 32 a passage 34 to receive the
knife-blade. The contour of this passage in a 25
horizontal plane may generally correspond to
that of the blade, and the block is shown as se
cured variably in position upon the blade- by
sct~screws 36. The surface 30 extends laterally
from the blade above and substantially parallel 30
to the upper face of the pattern, and conse
quently to the sheet S clalnped thereon, toward
the clamp l4. There is also preferably an ex
tension of the surface over the sheet and pattern
along the line of the cut forwardly and rearward- 35
ly from the edge 24 and at the outer side of the
blade opposite the surface 26. For a particular
thickness of stock to be operated upon, the block
28 is adjust-able vertically upon the blade and
secured thereon by the set-screws 36. The surface 30 bears upon the upper face of the sheet,
holding it positively against upward displacement
from the pattern as the knife passes through it.
Moreover, the forward and rearward extension
40 '
of the surface 38 has an ironing effect upon the 45
upper face of the work, tending to free it from
irregularities, either present in the stock or which
might be produced in cutting. As a result of this,
the edge and margin of the cut piece, even with
relatively soft, sleazy material, is left uniformly 50
even and smooth. The work-engaging portion
of the surface 30 in advance of the edge 24 of the
blade is shown as curved or inclined upwardly at
38 from the plane of the work. This furnishes
a throat by which the upper surface of the work- 55
2
2,116,680
sheet is received during the travel of the knife
and is prevented from catching. The outer edge
of the surface at 40 is similarly curved or in
clined to provide clearance for the chip which is
cut, as this curves outwardly and upwardly.
Having described my invention, what I claim as
new and desire to secure by Letters Patent of the
United States is:
1. In a knife for use in rounding machines,
10 a blade integral with a shank arranged to be se
cured in the. holder of the machine, said blade
being provided with a cutting edge extending
from the shank to the opposite extremity of the
knife, a gage-block surrounding the blade and
15 variable in position longitudinally thereof, and
means carried by the block for securing it to
the blade.
2. In a knife for rounding machines, a cutting
blade, and a block secured to and supported
20 wholly by the blade and provided at the side to
ward the work with a surface surrounding the
blade, said surface being inclined in advance of
the cutting edge and at the side of the blade
opposite the work outwardly from the plane of
25 said work.
3. In a rounding machine, a pattern furnish
ing a support for a work-piece, a clamp movable
toward and from the pattern for securing the
work-piece thereon, there being a portion of the
30 work-piece extending over the pattern beyond
the periphery of the clamp, a holder movable
about the pattern, and a knife secured in the
holder and extending above the pattern, said
knife being provided with a projection extending
over the pattern and toward the clamp and hav
ing a surface for engagement with the outer 5
portion of the free margin of the work-piece
which is substantially parallel to the upper face
of the pattern and contacting with the outer
portion of the free margin of the work-piece.
4. In a rounding machine, a pattern furnishing 10
a support for a work-piece, a clamp movable to
ward and from the pattern for securing the work
piece thereon, there being a portion of the work
piece extending over the pattern beyond the pe
riphery of the clamp, a holder movable about 15
the pattern, a knife secured in the holder and
extending above the pattern, said knife being
provided with a projection extending over the
pattern toward the clamp and contacting with
the outer portion of the free margin of the work 20
piece, and means arranged to vary the position of
the projection upon the knife.
.
5. In a rounding machine, a pattern and a
clamp between which the work is held, a carrier
and a knife mounted therein and movable about 25
the pattern, a block surrounding the knife and
provided with a work-engaging surface, and
means arranged to secure the block in different
positions upon the knife toward and from the
pattern.
30
HARRY A. HAWKES.
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