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Патент USA US3091797

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June 4, 1963
s. HAWKES
3,091,787
LAST REMOVING MACHINE
Filed Dec. 11, 1961
3 Sheets-Sheet 1
June 4, 1963
s. HAWKES
3,091,787
LAST REMOVING MACHINE
Filed Dec. 11, 1961
37-—
3 Sheets-Sheet 2
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June 4, 1963
s. HAWKES
3,091,787
LAST REMOVING MACHINE
Filed Dec. 11, 1961
3 Sheets-Sheet 3
c
3,091,787
Patented June 4, 1963
2
3,ll§1,787
Sidney Hawires, Rushden, England, assignor to Fred
Hawkes (NIV. Engineers) Limited, Rushden, England,
LAST REMOVING MACHTNE
a British company
,
,
Filed Dec. 11, 1961, Ser. No. 158,181
Claims priority, application Great Britain Dec. 15, 196i)
7 Ciaims. (Cl. 12—15.1)
producing relative closing movement between the last sup
port and stripper device, and means responsive to a pre
determined contact pressure between the stripper device
and a lasted shoe on the last support to provoke a move
ment of this stripper device transverse to the direction of
said closing movement to slip the shoe from the last.
We thus are afforded, in effect, an automatic jacking
system which automatically ensures a correct degree of
pressure application between the shoe and the stripping
This invention is concerned with last removing ma 10 device, irrespective of variations in the size of shoe and
chines such as are used in the boot and shoe industry
the dimensions of the lasts. Further, the slipping move
for separating a fabricated or partially-fabricated shoe
ment cannot start until correct pressure has been es
(or similar item of footwear) from a last on which it
tablished between shoe and stripping device and danger
has been made. All such articles will, for convenience,
of faulty manipulation of, and damage to, the shoe is
hereinafter in this speci?cation be assumed comprehened 15 precluded.
in the term “shoe.”
By virtue of these arrangements, when a last to be
Conventional machines of this character ‘are provided
slipped is moved against the stripping device, in a motion
with an upstanding jack pin on which the last, carrying
which can be brought about by various pneumatic, me
the fabricated shoe, is mounted with the pin entering the
chanical, or other means and can be initiated by the hand
hole provided at the upper side of lasts for support in 20 or foot of an operator or by some automatic control, the
this way during the actual manufacture of the shoe there
remainder of the shoe-removing operation takes place
on. The machines for this purpose also include a thrust
automatically and in self-adapting fashion, so that the
device (which can take various forms) which is then
shoe is engaged and removed from the last under the
arranged to be operated to engage at the back of the shoe
optimum conditions, irrespective of the distance between
heel and to lift it so that the shoe (which is, of course, 25 the jack pin hole and the ultimate extremity of the heel
sole upwards in this condition) will be pushed oi the
of the shoe.
last.
The required automatic response to bring about the
Various methods of engaging the shoe for this purpose
actual shoe slipping can be implemented in various ways,
have been used in the machines. In some cases a rubber
for example by electrical switch means, by the operation
pad is applied at an angle against the maximum curvature 30 of air valves controlling the stripping device, and so on.
of the shoe heel, whilst in others a roller is brought into
In one convenient form, the stripper device has a part
contact wtih the shoe at a similar position with the ob
which is yieldable under the contact pressure with the
ject of rolling the shoe olf the last.‘
'
-
lasted shoe, thereby to actuate a means to provoke a
In practice it is found that the distance between the
movement of this device as a whole transversely to the
jack pin hole and the ultimate rear curved end of the last 35 direction of closure movement between'it and the last
varies from last to last. To cater for this it has been
support.
.
necessary in the past, to equip the last removing machine
‘In pursuance of this last-mentioned arrangement, the
so that the position of the jack pin relatively to the strip
stripper device may comprise an upwardly-movable head
ping member, i.e. the pad or roller, can be adjusted by
assembly which includes a pivotally-mounted stripper
the operator and set ready in the adjusted position for
member which will yield and pivot relatively to the
each last variation. This, however, is not only time con
remainder of the assembly, to cause operation of means
suming and troublesome, but is imprecise inasmuch as
producing the upward movement referred to.
the actual variation of the aforesaid distance can only be
The stripper member referred to will best comprise a
generally judged by the eye, so that the setting must always
pad of rubber or other resilient material which will grip
be a rough one. On account of this, experience teaches 45 but not damage the shoe upper when they are in tight
that the uppers of the shoes are frequently damage be
engagement, and this pad may itself be hingedly carried
cause of the improper application of the stripping mem
by a support member and urged outwardly from the latter
ber.
by spring means. Advantageously the support member,
Thus, conventional last removing machines are gen
and hence the stripper pad holder, can be set at an ad
erally ?tted with a hand wheel to enable the operator to 50 justable angle to the vertical, e.g. by set screw means.
adjust the jack pin fore and aft to compensate vfor major
This allows for the selection of the optimum angle of en
variations of measurement between the jack pin hole
and the rear extremity of the last. Over-adjustment away
gagement between the stripper member and the shoe heel,
The machine which forms the subject of the present
In the last mentioned case, the trip means triggering
the last removal is indicated as carried by thev stripper
device. It is to be appreciated that it could instead be
carried by some yielding means associated with the last
to cater for example for heels of different back curvature.
from the operator often results in a stoppage or breakage
A predetermined degree of pivoting of the pad holder
because the working pressure between the rear end of 55
on
its support member, under the pressure of the lasted
the shoe and the pad or roller is too great, whereas under
shoe presented to it, can then be arranged to operate trip
adjustment towards the operator results in slip between
means, as indicated above-conveniently an electrical
the pad or roller and the rear surface of the shoe upper,
switch or an air valve, to initiate the upward movement
with consequent damage to the material of the latter and
of the strippermember.
.
T
loss of time.
60
_ invention has been devised with the object of overcom
ing these various shortcomings and comprises a last sup
port, an associated movable stripper device, means oper
able to move said last support to apply the heel of the
lasted shoe against said stripper device, and means re—
sponsive to contact pressure ‘between the lasted heel and
stripper device to operate the latter so as to slip the shoe
from the last.
‘
Thus, in an advantageous form themachine comprises
support.
-
,
Referring now to the initial closure of the lasted shoe
and the stripping device, it will be realised that this can
be brought about in various ways. It has however been
found very effective to use an arrangement in which the
last support is mounted inthe machine so as to be pivot
a last support, a stripper device normally parted from
able to close a last thereon against the’ stripper device,
said last support and a lasted shoe thereon, means for
transmission to produce this pivoting movement.
and said last support is movable through a cam or wedge
spams?
3,
,
the stripping member of the latter with a uniform pres
is that a predetermined swing of the holder 14 will operate
the microswitch, which has been diagrammatically in
dicated at 2G[ in FIGURE 4.
Mounted between the side walls of the main frame 1
‘sure, irrespective of the distance between the last jack
pin and the back of the shoe.
,In one arrangement, the last support includes an up
standing post which is f-ulcrumed in a main frame of the
machine and, at its lower end, carries a part moving
a jack pin 26.
By using a cam or wedge to pivot the last support, it
is readily practicable to carry the lasted shoe progres
sively towards the stripping device, and apply it against
below a slot 21, extending across the width of the latter
at its front shouldered part, is a shaft 22 which has
rotatable thereon a casting 23 which includes an upstand
ing column 24 with a post 25 at its upper end supporting
The casting 23 at its lower side and at one end is
formed with a depending tapered arm 27 with a pin 28
over a cam or wedge surface which is movable by an
operating means so as to swing about a remote pivot.
projecting from its lower end. The pin 28, or a roller
Such remote pivotal mounting of the cam or Wedge pro
vides for a very smooth and sensitive swing of the last
thereon, is received in a cam slot 29 in the enlarged end
of a further arm 30 which is pivoted at its other end, to
support. As indicated the cam or wedge can be oper
ated in various Ways, e.g. by a hand lever, foot treadle 15 a pivot pin ‘31 in a wall of the main frame 1. Pivoted
at its lower end on a cross spindle 32 in the frame 1 is an
or by a pneumatic cylinder or a hydraulic cylinder under
air cylinder 34, the piston rod 35 of which is pivotally
foot or hand control of an attendant.
coupled by a yoke 36 to arm 30.
Another air cylinder 37 is mounted on a step bearing
38 on the aforesaid base of the main frame 1, and the ram
It has, however, proven very satisfactory to use air
(or, it could be, hydraulic) means to operate all the
moving parts of this machine, and in one version the ma
chine includes a pneumatic operating system which
comprises a ?rst air. cylinder to pivot the last support and
of this cylinder forms an extension of the shoe removing
ram 4.
1
'
occur when a shoe is to be removed, is cast in one piece
with an arm v53 which is pivotally supported by a pair of
spaced lungs 48 on spindle 32. At its rear end, arm 33
cooperates with the plunger 49 of a valve 40 controlling
slip the shoe from the last, a mechanically-operable valve
controlling the air supply to said ?rst cylinder, and a
solenoid valve operable in response to a predetermined
pressure between the shoe and stripper device to open the
air supply to said second air cylinder.
~
A treadle 39, for initiating the various movements which
cause a lasted shoe to be closed against the stripper de
vice, a second air cylinder to move the stripper device to
the air supply to cylinder 34 (see below).
The controls for the machine are diagrammatically il
'
A form of last removing machine is illustrated in the 30 lustrated in FIGURE 4, and it is to be noted that when
the treadle 39 is depressed, the resultant movement of
plunger 49 shifts over the valve member in valve 40 and
FIGURE 1 is a perspective illustration of the com~
accompanying drawings, in which:
so allows air to pass from a main airline 41 to the lower
plete machine,
‘FIGURE 2 is a side view of the same with a vertical
section through the main frame housing.
end of cylinder 34 and the piston rod 35 to be raised.
35 Included in this line is an adjustable restrictor indicated at
FIGURE 3 is an enlarged side elevation of the head
assembly of the machine, with part in vertical section,
an
FIGURE 4 is a diagrammatic illustration of the strip
per head assembly in association with the pneumatic
operating means of the machine.
I
The machine illustrated comprises a hollow main
frame 1 which serves to house the operating parts of the
machine and is shouldered at its upper part into a rear
shelf-forming portion 2 having a boss 3 through which
passes a plunger ram 4
bly of the machine.
served by an attendant
the perspective view in
carrying the stripper head assem
The machine, in use, will be
standing at the front side seen in
FIGURE 1, and the head assem
The line 41 has a branch 42 incorporating a slide valve
43 which is normally closed and is operablel by a
solenoid in a casing 44. The solenoid windings are con
nected to the supply mains at 51 via the microswitch 20 of
the head assembly, and the arrangement is that when the
solenoid 44 is energised by closure of switch 20, it re
tracts the valve member in 43 and so opens the branch
42 to the underside of the piston in the air cylinder 37
to produce an upward stroke of ram 4.
A normal operation of the machine therefore proceeds
as follows.
The operator in front of the machine places a last 45,
carrying a shoe 46 to be slipped, sole-uppermost on the
jack pin 26. 1 On depression of the treadle 39, the piston
bly is therefore positioned at about normal elbowheight. 50
35 of air cylinder 34 is operated and the arm 30 swings
This head assembly comprises a block 5 which is
upwards to a small extent. The pin 28, bearing on the
clamped on ram 4 by screws 6 and has a pair of lateral
cam edge of slot 29, is consequently moved forwards a
' wings 7 on which are pivoted corresponding lugs 8 on a
small amount and the post 24 accordingly rocked through
stripper pad supporting plate 9. As will be observed
from the drawings, this plate is arranged at an inclina 55 a small angle to bring the heel 47 of the shoe 46 against
the pad 16, i.e. into the position indicated in dotted lines
tion to the vertical ram 4, and this inclination can be
in FIGURE 2, and then with a continuing pressure on
this pad until the resistance of compression springs 15 is
threaded in the upper part of the plate 9 and bearing
overcome and the microswitch 20‘ is closed. By virtue of
against block 5, and a lower adjusting screw 11 which
is threaded into a forward extension piece of the block 60 the substantial length of arm 30 and the large curvature
and vertical disposition of the cam edge 29‘, the move
5 and has its head bearing against the lower margin of
ment of the heel 47 is small but continuous, and is pos
plate 9.
sible to make the pressure-response of the microswitch
This latter has lateral ears 12 serving to carry the
very
sensitive.
, pivot 13 for a stripper pad holder 14 which overlies the
It will be noted that the part of the heel 47 against
front face of support plate 9 and is normally spaced
_ varied, to suit particular requirements, by a set screw 10
therefrom by compression springs 15. The outermost
- position of holder 14 is determined by a pin 52 on the
holder, which engages in a slot in a link 53 on plate 9*.
Inset into this holder 14, and clamped thereto by side
cheeks 51, is a rubber stripper pad 16 having a rounded
front surface.
It is to be noted also that the holder 14 carries a
screwed stud 17 of adjustable length at one lower side,
and this cooperates with the head 18 of a switch-operating
plunger in a microswitch casing 19. The arrangement
7 which the pad 16 engages at this time can be adjusted by
appropriate ‘setting of screws 10 and 11, if so desired,
and that in every event [the degree of pressure between the
shoe and the pad 16, required to operate switch 20, can
be varied by choice of appropriate olading of springs 15
and/ or by an adjustment of the length of the stud 17, so
as to provide for optimum conditions for shoe engagement
and subsequent removal.
This removal is, in fact, performed in response to
closure of switch 20, inasmuch that, as explained above,
5
8,091,787
this opens valve 43 and sends an air impulse to cylinder
37, so causing an upthrust of ram 4 and a lifting of the
complete head assembly, including the pad 16. The post
24 and last 45 remain stationary (since air continues to be
applied to cylinder 34), so that the shoe 46 is slipped
smoothly off the last.
yieldable part of the stripper device to trigger said strip
per operating means.
5. A last removing machine as claimed in claim 4, in
which the stripper device comprises an upwardly-mova
ble head assembly, and this assembly includes a stripper
member ‘which is pivotably-mounted in the assembly and
is adapted to yield and trigger the said stripper operating
I claim:
1. A last removing machine comprising a frame, a
means.
last support, movably mounted on said frame, a stripper
‘6. A last removing machine as claimed in claim 4, in
device movably mounted on said frame, means operable 10
which the stripper device comprises a support member,
to move said last support towards said stripper device,
a stripper pad holder hingedly mounted on said support
thereby to apply a lasted shoe on said last support against
member, compression spring means between said holder
said stripper device, and means responsive to predeter
and said support member, and switch means operable in
mined contact pressure between the lasted shoe and
stripper device to move said stripper device relatively to 15 response to a predetermined degree of pivoting move
ment of said holder to trigger said stripper operating
said frame and said last support.
2. A machine as recited in claim 1 wherein said means
operable to move said last support toward said stripper
device comprises ?uid~operated means including a cam
means.
7. A last removing machine comprising a frame, a last
support pivotable on said ‘frame, a stripper device on said
frame and normally parted from said last support, and a
transmission.
20 pneumatic operating system which comprises a ?rst air
3. A last removing machine as recited in claim 2,
cylinder to pivot the last support and cause a lasted shoe
wherein said last support comprises an upstanding post
on said support to be closed against the stripper device,
fulcrummed in said frame and having, at its lower end, a
a second ‘air cylinder to move the stripper device to slip
part movable over a cam surface on an arm mova'ble by
the
shoe from ‘the last, a mechanical-ly—operable valve
said ?uid-operated means.
25
controlling the air supply to said first cylinder, and a
4. A last removing machine ‘comprising a frame, a last
solenoid valve operable in response to a predetermined
support on said frame, a stripper device on said *frame
pressure between the shoe and stripper device to open
and normally parted from said last support, said strip~
the
air supply to said second air cylinder.
per device including a part which is yieldable relatively
to the remainder, closing means for producing relative 30
References Cited in the ?le of this patent
movement in a closing direction between the last sup
UNITED STATES PATENTS
port and the stripper device, stripper operating means
for producing a shoe-slipping movement of said stripper
device in 1a direction transverse to said closing direction,
and means responsive to a predetermined yielding of said
2,182,832
Whelton _____________ __ Dec. 12, 1939
735,316
Great Britain _________ __ Aug. 17, 1955
FOREIGN PATENTS
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