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Патент USA US2136522

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Num :fb Mm.,
c. '1. POLL/ARD
29336522
METHOD OF'AND MACHINE FOR CUTTING WOOD HEELS
Filed May 4, 193e
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H5, W3.,
c. l. KDQLLARID'METHOD OF AND MACHINE FOR CUTTING WOOD HEELS
Filed May 4,' 195e
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Patented Nov. 15, 1938
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UNITED STATESPATENT OFFICE
2,136,522
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Y
`METHOD OF AND MACHINE FOR CUTTING
WOOD HEELS
Carl I. Pollard, Himrod, N. Y., assignor to United
Shoe Machinery Corporation, Paterson, N. J.,
a corporation of New Jersey
Application May 4, 1936, Serial N0. ’77,727
15 Claims. (Cl. 12-47)
This invention relates to machines and meth- blank occurs intersects the solid of revolution
ods for cutting heels and in its machine aspect generetedby the Cutter and lies Parallel t0> e
is illustrated as embodied in a machine for grooving Cuban heels. The illustrated machine is
5 similar in construction to that shown in United
perpendicular to the rotational axis of the cutter.
Thus, the out in the heel blank progressively OI
Varies between e Circuler andv an elliptical Shape
States Letters Patent‘No. 1,669,672', granted May
in horizontal cross-section, with the result that it
15, 1928, on my application.
cuts in a wider, natter curve when so swung and
Cuban heels, as they originally appeared in
the trade, were not grooved at the breast, which
10 Was ñat, the breast surface being formed by the
saw which originally formed the heel blank. As
the requirements of ñne shoemaking became
such relative orientation of the heel blank and
Cutter When it iS Cutting the upper and lOWeI‘
ends of the heel breast can be taken advantage 10
of t0 form the breast surface in these regiOnS
with a ilatter curvature and will therefore cause
more exacting, the breast surfaces of Cuban heels their end DOl‘tiOnS to be farther t0 the rear than
Were cut in vertical cylindrical grooves. The they WOllld Otherwise have been, and Will tend t0
15` intersection of such a surface with the concave straighten the concave breast edges.
15
side surfaces of the heel formed the so-cailed
A perfectly straight line down the center of
breast corners or edges which were concave when the breast So formed is Secured by reason of the
seen from the sides, This was` due to the fact relation between the axis around which the ori
that the flaring portions of the concave side entation of the cutter and the heel blank occurs
20 surface, at the upper and lower ends of the heel, -and the Surface of revolution generated bv the 20
' would intersect the cylindrical breast surface at Cutting edge 0f the Cutter. This Surface is that
points farther from the central line of the eylin- of the exterior of a torus or anchor ring. formed
drical groove and hence farther to the front by I‘eVOlViIlg e Cutting blade the edge 0f Which
than the narrower portions would,
This resulting concavity of the breast edges
was regarded as a detriment from the standpoint
of style, and a number of attempts were made to
correct it. The most successful solution was that
of Harley W. Russ, described and Claimed in
30 United States Letters Patent No. 1,528,345,
granted March 3, 1925, in accordance with which
the cylindrical breast surface was bent backwards in its upper and lower regions, thus drawing backward the forwardly extending upper and
35 lower ends of the breast edges, and leaving a
relatively high region at the center of thebreast
surface.
The object of the present invention is to `provide a machine which will cut a breast surface
40 with the usual vertical cylindrical appearance,
having straight appearing breast edges and hav-
25
ing a straight, instead of a curved, vertical cen-
tral breast portion. This result is secured by a
relative rotative movement between the cutter
45 head and heel blank about an axis intersecting
the solid of revolution generated by the cutter
head, compounded with a simple rectilinear rela~
tive movement between the cutter head and the
constitutes in effect a circular generatrix about
ah eXíS Parallel t0 and beyond that diameter 25
Which iS perpendicular t0 its aXiS 0f Symmetry.
In accordance` with the present invention the
center of curvature of the circular arc or geh
eratrix when the latter is in its position inter
secting the lOïlgîtlldíhel median lille’ 0f the Sul‘- 30
face beine `formed Orl the heel is located in the
axis around which the above-discussed relative
swinging movement of the cutter and heel blank
takes place so that the depth of cut over the ver
tical central line of the breast is not affected,l 35
since the operative part of the effective cutter
head shape and the work simply pivot relatively
to each other around the saidY center of curva
ture. Thus, by appropriate design, the central O
breast line will be straight, and the upper and
lower portions of the breast‘edges will be drawn
back so that the breast edges can be made to lie
in a plane and will thus appear straight when
seen from the sides.
In its machine aspect the invention comprises 45
mechanical structure for practicing the method
above outlined.
These and other features of the invention com- y
heel breast. Such a simple movement of the cut5.0 ter relatively to a heel breast, in a direction par-
prising certain combinations and arrangements
of parts will be apparent from the following de- 50
`
scription of a preferred embodiment of the in
vention shown in the drawings, in which
Fig. 1 is a front elevation of the machine;
Fig. 2 is a plan section on the line II-II of 55
Fig. 1;
«
allel to the cutter axis, will produce the breast
surface with the objectionable concave appearing breast edges above described. In accordance
with the present invention the axis about which
55 the relative orientation of the cutter and‘heel
2
2,136,522
Fig. 3 is a right end elevational section on the
line III-III of Fig. 1;
Fig. 4 is a detail of the chain carrier;
Fig. 5 is a detail of the cutter head; and
Figs. 6 and 7 are details illustrating the vary
ing action of the cutter in different positions,
The machine frame carries two shafts I2, I4
carrying sprocket wheels I6, I8, respectively.
The shaft I2 is driven by a motor 20 through a
gearing in a box 22, and a sprocket and chain 24.
The sprocket wheels I6 and I8 are connected by
a double sprocket chain 26, through which the
shaft I4 is driven, and the relative rectilinear
component of the feeding movement of the work
and the cutter is effected in the illustrated ma
chine by a movement of the heel blanks past the
cutter.
The chain 26 bears a number of jacks or car
riers 28 (Fig. 4), equally spaced along it. Each
carrier 28 has a simple pivotal connection to the
chain 26 at 30 and also a link connection at 32,
to allow free passage of the carriers 28 around
the sprocket wheels. The carriers 28, when op
posite the cutter (to be described below), run
over a supporting member 34 (Fig. 3) mounted
on a bracket 36, `and are supported against lat
eral pressure from the cutter by rolls 38 (Figs.
2 and 3) also supported on the bracket 36.
Each jack 28 is provided with a gage plate 40
30 (Fig. 2) angularly adjustable by means of a
bolt and .arcuate slot and arranged to contact
with the attaching face of a heel blank 42. Each
carrier 28 is also provided with a back gage 44
similarly angularly adjustable and arranged to
35 contact with the rear facev of the heel blank 42.
An adjustable breast gage 46 is also provided,
mounted on the frame Il).
The gages 44 and 46
will not ordinarily be used simultaneously, since
the blanks 42 usually vary somewhat in dimen
40 sions, even when cut for the same heels.
The blanks 42 are held firmly down upon the
carriers or jacks 28 as they pass over the sup
port 34, by a knife-edged member 48, engaging
their upper surfaces, mounted in a vertical and
vertically adjustable slideway 50 and forced
downward by a weighted lever 52, its downward
movement being limited by a pin 5I. Thus
blanks inserted at the left (Fig. l) end of the
machine will be carried across to the right, and,
when passing the middle portion of the machine,
will pass under the member 48 and will be firmly
held against any movement except that to the
right by the support 34, the member 48 and the
rolls 38.
The cutter organization 54, shown diagram
matically in Figs. 2 and 5, comprises a horizontal
shaft 56 driven by a motor 58 by means of a belt
59. The whole organization 54 is pivoted on a
vertical axis at 60 on a dovetailed bracket 62,
60 which is vertically adjustable in a correspond
ingly dovetailed slide in the frame I0 by a screw
64 (Figs. l and 3). The organization 54 has a
slotted arm 86, whereby an adjustable connec
tion can be made with a link 68, biased by a
spring 69, to swing the cutter head organization
54 about the pivot 60. Such action is brought
about by a cam 'I0 (Figs. 1 and 2) mounted on
the shaft I4, and cooperating with a lever 'I2
pivoted to the frame I0 at 'I4 and having a ball
70 and-socket joint 'I6 with the link 68. The low
est parts of the cam 'I0 are constructed to place
the cutter in the full line position of Fig. 2 and
timed to effect this when the cutter is passing
over the central portions of the blank 42.` The
75 rise which follows such a portion moves the` cut
ter toward the dotted line position in Fig. 2
corresponding to the cut from the center of the
breast to the attaching face. The following
high portion of the cam corresponds to the
transit from one blank 42 to the next to the LW
left in Fig. 2, with the cutter in the tilted (dot
ted) position, and the next drop carries the cut
ter back to the full line position as the cut
moves from the top-lift end to the center of this
next blank to the left, in Fig. 2. These two p0
sitions of the tiltable cutter head are .also il
lustrated in Figs. 6 and 7, respectively, and in
Fig. 5.
The cutter shaft 56 carries two cutter blades
18, the cutting edges 80 of which constitute gen
eratrices which are illustrated as having an ef
fective semi-circular form 88 (Fig. 5), the sur
face of revolution of the cutter being therefore
the exterior surface of a torus, and the blades
are adjusted so that the center of the effective 20
semicircle of that blade which is cutting the
heel blank 42 at its longitudinal median line is
in line with the pivotal axis 60 (Figs. 2 and 5).
Thus the swinging of the cutter by the cam 'I0
(Fig. 2) will not affect the depth to which the
cutter cuts along the longitudinal median line
of the heel breast surface of the heel blank 42,
since the semicircle which generates the torio
surface will merely turn relatively to its fixed
center at 60, and this central line will therefore
be straight, up and down the heel breast sur
face. At the side edges of this surface, however,
the condition is different, as shown by compar
ing Figs. 6 and 7. The tilting of the cutter head,
as the upper and lower parts of the heel breast
surface are being treated, causes its effective con
tour to become elliptical (Fig. '7) instead of cir
cular (Fig. 6) with the result that it cuts more
deeply at the edges of the blank at the top and
bottom than it does in the middle. This will re
sult in drawing back the upper and lower breast 40
corners of the blank when the side surfaces of
the blank are cut in the turning machine, and by
proper design and adjustment of the machine
the two breast corner lines can be made to look
straight when seen from the sides of the com
pleted heel.
`
While the dotted line position of the cutter in
Fig. 2 has the correct relation to the full line
position, .and to the machine as a whole, it should
be noted that the heu blank will be ahead of or '
behind the location shown in Fig. 2 when the
cutter is in its dotted position.
Having described my invention, what I claim
as new and desire to secure by Letters Patent .
of the United States is:
1. In a heel cutting machine, a heel blank car
rier and a rotary cutter arranged for relative
traversing movement in a certain direction, the
plane determined by the axis of the cutter and 60
the line of the said certain direction being sub
stantially perpendicular to the heel blank surface
being operated upon, said cutter axis being ar
ranged to swing about an axis located between
the center of the cutter and the work, said axis
being substantially parallel to a line perpendicu
lar to the cutter axis and also parallel t0 the said
heel blank surface, and mechanism for so swing
ing the cutter axis during the said relative move
ment to alter progressively the shape of the cut 70
in the heel blank.
.
2. In a heel cutting machine, a heel carrier,
a rotary cutter the surface generated by the cut
ting edges of which comprises a toroidal surface
of revolution, mechanism for moving the heel car
3
2,136,52a
rier past the cutter in a direction lying generally
in the direction of the cutter axis, and mecha-`
nism for swinging the cutter about an axis lying
transverse to its axis of rotation and intersecting
‘ the toroidal surface between the cutter axis and
the work to vary progressively the effective cutting
with the axis of rotation of the cutter lying in a
direction heightwise of the heel blank, said or
ganization being pivoted on an axis lying substan
tially perpendicular to the plane defined by the
said parallel direction and the said axis of rota
tion and intersecting the surface of revolution
generated by the cutter, between the axis of rota
curvature of the cutter as it passes a heel blank in ` -tion of the cutter and the breast surface of the
the heel carrier.
3. In a heel cutting machine, a rotary cutter
having a blade the cutting edge of which gener
heel blank.
ates a toroidal surface of revolution, a heel car
is
rier, and mechanism for causing relative move
ment of said carrier and said cutter in a direction
having a circular component about an axis inter
secting said toroidal surface whereby the effective
cutting curvature of said cutter is progressively
varied as the heel and the cutter pass each other.
Ll. In a heel cutting machine, a rotary cutter
the cutting edge of which constitutes in effect a
9. In a heel grooving machine, a carrier ar
ranged to move a heel-blank therein in a direc
tion substantially parallel to the breast surface of
the heel blank and extending heightwise thereof,
an organization comprising a rotary cutter with
the axis of rotation of the cutter lying in a direc
tion heightwise> of the ‘neel blank, said organiza
tion being pivoted on an axis lying substantially
20 circular generatrix arranged to generate a tor
oidal surface of revolution, a heel carrier, and
mechanism for causing relative feeding move
ment of said cutter and said carrier, said feeding
movement having a circular component about an
axis intersecting the center of said generatrix
when in its position intersecting the longitudinal
perpendicular to the longitudinal central vertical
plane of the heel blank and intersecting the sur
face of revolution of the cutter between the axis 20
of rotation of the cutter and the breast surface
of the heel blank, and means operated in timed
relation to the movement of a heel blank on the
carrier to swing the said organization about the
said pivotal axis while the heel blank is passing 25
the cutter.
median line of the generated heel surface.
i0. In a heel grooving machine, a carrier ar
ranged to move a heel blank therein in a direc
5. In a heel cutting machine, a heel carrier, a
rotary cutter having blades the cutting edges of
30 which generate a toroidal surface of revolution,
mechanism for relatively moving the heel carrier
and the cutter in a certain direction, the said di
rection and the axis of rotation of the cutter being
parallel to the same plane, and mechanism for
35 swinging the cutter axis around a second axis ly
ing substantially perpendicular to the said plane
and intersecting the said toroidal surface whereby
tion substantially parallel to the breast surface
of the heel blank and extending heightwise there 30
of, an organization comprising a rotary cutter
with the axis of rotation of the cutter lying in a
direction heightwise of the heel blank, said or
ganization being pivcted on an axis lying substan
tially perpendicular to the longitudinal, height 35
wise, central plane of the heel blank and inter
secting the surface of revolution of the cutter be
tween the axis of rotation of the cutter and the
the effective cutting radius of the cutter relatively
to a heel blank in the said carrier may be progres
sively varied as the heel blank and the cutter
40
pass each other.
breast surface of the heel blank, and means oper
ated in timed relation to the movement of the 40
carrier to swing the said organization about the
_
6. In a heel cutting machine, a heel blank car
rier, a rotary cutter having a cutting edge which
is effectively semicircular with the center of the
semicircle spaced from the axis of rotation of the
45 cutter, Vsaid cutter as a whole being pivotally
mounted on an axis substantially at right angles
to its axis of rotation, said pivotal axis passing
substantially through the center of the said semi
circle in that one of its rotated positions around
50 the axis of rotation of the cutter which is nearest
said pivotal axis while the heel blank is passing
the cutter, said means being arranged to bring
the axis of rotation of the cutter to minimum
Obliquity to the direction of relative traverse of 45
to the path of a heel blank in the carrier.
'7. In a heel cutting machine, a rotary cutter
having a cutting edge which is effectively a cir
cular _arc with the center of curvature of the arc
55 spaced from the axis of rotation of the cutter,
Said cutter as a whole being pivotally mounted on
an axis substantially at right angles to its axis
of rotation, said pivotal axis passing substantially
through the center of curvature of the said arc in
that one of its rotated positions around the axis
of rotation of the cutter which is nearest the path
of the work, and a heel blank carrier arranged to
move a heel blank therein past the said rotated
position as the cutter is pivoted on the said piv
V65
otal axis, whereby the transverse curvature of the
surface formed on the heel blank by the cutter
will vary from one point to another, and the cen
tral line of the surface will be substantially
70
straight.
`
8. In a heel grooving machine, a carrier ar
ranged to move a heel blank therein in a direc
tion substantially parallel to the breast surface of
75
the heel blank and extending heightwise thereof,
and an organization comprising a rotary cutter
the heel blank and cutter when the cutter is
treating the middle region of the heel breast.
11. In a heel grooving machine as defined in
claim 9 wherein the heel carrier comprises a
plurality of heel blank holding packs, a cam for 50
swinging the cutter organization, said cam hav
ing an operative surface arranged to control the
swinging movement in the same timed relation to
the movement of each jack past the cutter.
12. That improvement in the art of cutting 55
wood heels which comprises effecting a relative
movement of a heel blank and a rotary cutter
blade in a line lying generally in the direction of
the cutter axis, and compounding withrthe rotary
movement of the cutter blade about its axis a 60
second rotary movement about an axis lying per
pendicular to the longitudinal central vertical
plane of the heel blank, and lying also between
the point of attachment of the blade to the cutter
65
axis, and the work.
13. That improvement in the art of cutting
wood heels which comprises rotating about an
axis a cutter blade the effective shape of which
is a circular arc, effecting a relative movement
between a heel blank and said cutter blade in a 70
direction lying substantially parallel to the face
of the heel blank that is being cut, and com
pounding with the rotary movement of the cut
ter blade about its axis of rotation a second ro
tary movement about an axis passing through 75
4
2,136,522*A
the center of curvature of the said circular arc
when said arc is in the position it occupies when
the said blade is effecting its ñnishing cut upon
a point of the said heel blank surface, said last
named axis being also perpendicular to the plane
defined by the axis of rotation of the cutter blade
and the central line of cut on the said heel blank
surface.
14. That improvement in the art of cutting
wood heels which comprises moving a rotary
cutter, the cutting edge of which constitutes, in
effect, a circular generatrix, and a heel blank
relatively to each other in a direction substan
tially parallel to the face of the heel blank that
15 is being cut, and effecting a relative movement of
the blank and cutter about an axis passing
through the center of said generatrix in the posi
tion when the generatrix intersects the longitudi
nal median line of the generated heel surface.
15. That improvement in the art of cutting
Wood heels which consists in imparting a rela
tive translatory feeding movement between a heel
blank and a rotary cutter the cutting edge o1"
which constitutes, in effect, a circular generatrix,
and simultaneously eiîecting a. relative rotation of 10
said blank and cutter about an axis passing
through the center of said generatrix when in its
position which intersects the longitudinal median
line of the generated heel surface.
CARL I. POLLARD.
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