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Патент USA US2107634

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I Feb. 8,1938.
J. W. JOH NSTON
2,107,634
GRADING MACHINE
Filed Aug. 14, 1936
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Feb. 8, 1938.
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2,107,634
GRADING MACHINE
Filed Aug. 14, 1936
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Feb. 8, 1938.
J. w. JOHNSTON
2,107,634
GRADING MACHINE
Filed Aug. 14, 1936
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Feb. 8, 1938.
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2,107,634
GRADING MACHINE
Filéd Aug. 14, 1936
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Patented Feb. 8, 1938 '
2,107,634
UNiTED ‘STATES PATENT OFFICE
2,107,634
GRADING MACHINE
James W. Johnston, Manchester, N. H., assignor
to North American Holding Corporation, Syra
cuse, N. Y., a corporation of New York
Application August 14, 1936, Serial No. 96,072
11 Claims. (01. 69-11)
This invention relates to grading machines and
particularly to machines for grading died out
pieces of leather used in shoe making, and sim
ilar‘ blanks, as by evening or ‘marking the blanks,
5. or both, in accordance with the thickness of the
thinnest part thereof.
Although not limited thereto, the invention is
particularly applicable to the well-known Nichols
grading machines, and will be described in con
10, nection with a grading machine of the general
type shown in‘the Nichols Patent No. 1,130,321.
An important object of the invention is to
provide automatic mechanism for lifting the feed
‘roller at the delivery end of the machine, which
also constitutes the gauge roller in the case of
a skiving (evening or ?eshing) machine, thereby
relieving the blank of the duty of lifting the
feed roller as it has heretofore been obliged to do.
A further object of the invention is to provide
20 a novel adjustable and non-rotatable blank sup
port opposed to said roller.
In the accompanying drawings, which illus
trate such parts of a Nichols grading machine as
are necessary to an understanding of the present
invention,
Fig. 1 is a side elevation partly in section of a
grading machine particularly adapted to flesh
ing and embodying the invention;
Fig. 2 is a rear end elevation, partly broken
away and partly in section, of the machine shown
in Fig. 1;
'
porting bar and associated parts hereinafter de
Fig. 5 is a sectional view, similar to Fig. 3,
showing the application of the invention to an
'
Referring ?rst to Figs. 1 to 4, the machine has
40 the usual measuring or detecting rolls l0 and H
(Fig. 1) by which the blanks are fed forwardly
one by one toward the marking wheel l2 and
then to the skiving knife I 3. During the passage
of each blank between the measuring rolls I0
45 and H the thickness grade of the blank, which
is established by the thickness of the thinnest
part of the blank,v or of that area of the blank
which it is desired to measure, is detected, the
lower roll It being caused to move up and down
50 in response to variations in thickness of the
blank. The lower roll ll acts through the usual
setting mechanism to adjust the transverse slide
bar Hi, to which are ?xed the usual inclined or
wedge-like abutments 52 (Fig. 2). The endwise
55 adjustment of the slide bar 14 positions the abut
The frame of the machine may have the usual
table or shelf I8 on which the blanks are auto
matically and successively fed forward from the
bottom of a stack S to the continuously rotat
ing measuring rolls l0 and H. The upper roll
I!) is journaled in normally ?xed bearing boxes
and is continuously driven through gearing by
the continuously rotating main drive shaft l5,
and the lower roll H is geared to and driven by
the upper roll In.
Each blank is fed forward by the rolls l0 and
H into position between a presser bar [6 and
a continuously traveling blank propelling carrier
or feed chain l1.
As the leading end of each blank emerges from
between the measuring rolls Ill and II it oper
ates the usual trip (not shown) to start the ef
fective measuring action of the rolls I 0 and II 5
and preserve the measurement of the thinnest
spot detected, by adjusting the slide bar [4 and
consequently adjusting the abutments 52 cross
wise of the machine and rotatively adjusting the
marking wheel l2 in accordance with the meas 30
determined by the measuring rolls. As each
35 scribed; and
_
ness grade.
urement of the thinnest part of the blank as
Fig. 3 is a section on line 3--3 of Fig. 2;
Fig. 4 is a detail in plan view of the rigid sup
evening ‘machine.
ments so as to regulate the action of the skiv
ing mechanism in accordance with the thickness
grade of the blank, as determined by the detect
ing means (measuring rolls), and also acts
through the usual. mechanism to adjust the
marking wheel l2 in accordance with said thick
blank is fed forward on shelf [8 it is fed under
the usual gate 25, which is raised to admit the
blank and then lowered to rest on top of the
passing blank. When the rear or trailing end
of the blank passes out from under the gate, the
gate falls to the shelf l8 and acts through the
usual mechanism to stop the measuring action
and lock the usual setting devices in their ?nal
position of adjustment.
As the forward or advance end of the blank
approaches the marking wheel it engages and
depresses the usual trip 2| (Figs. 1 and 3) and
acts through the usual mechanism to occasion a
single complete revolution of the gear 22, which
is normally at rest. The gear 22 acts through
the ‘usual train of gears 23 to impart a single
complete revolution of the gear 24 fast on shaft
25. Shaft 25 carries the usual cam (not shown)
and when thus rotated the cam raises and then
releases the plunger 26 (Figs. 1 and 2) which
carries the marking wheel l2 whereupon the
plunger 25 and wheel I2 are forcibly thrown
downwardly by the usual spring 21 to cause the 55
2
2,107,634
marking wheel to strike and mark the blank.
From the marking wheel the blank is advanced
to the skiving mechanism whose action is con
trolled by the position of the slide bar “I and its
abutments, which in turn are responsive to the
detecting
rolls.
-
~
As thus far described the construction and
operation of the machine may be as usual in the
well-known Nichols evening and grading ma
chines.
10.
V
The present invention has to do mainly with
the skiving mechanism.
Heretofore the gauge roller above th-e'skiving’
knife, which is also a feed roller, was required to
be lifted by the leading edge of the advancing
15
blank until it was arrested by the abutments,
which had already been adjusted in accordance
with the thickness measurement of the thinnest
spot as found by the detecting rolls. This gauge
and. feed roller has usually been constructed as a
comparatively heavy solid metal roller, and the
36 and the end of the main bed 31 yieldingly urge
the block away from the bed and hold the arms 39
against the upper ends of the posts 42. These
springs are housed in recesses‘ on the inner side
of block 36. Near the outer extremity of each
arm 39, and upon the under side thereof, is pro
vided a partly spherical socket 4! within which is
seated the rounded upper end of a vertical post
42. The lower end of each post is threaded and
occupies a threaded aperture in a crossbar 43, 10
which is a rigid part of the machine frame. Fixed
to each post 42 is a worm gear 44 engaging a worm
45 fast on a transverse shaft 36a journaled in
bearings on the. frame of the machine. One end
of shaft 36“ extends outwardly beyond the frame 15
and has ?xed thereon a hand wheel 46 (Fig. 2)
by means of which it is manually rotated thereby '
to adjust the posts 42 vertically. Endwise move;
ment of the shaft 3V5EL is‘ prevented by the hand
wheel 46 at one end
a collar 41 ?xed to the op 20
- posite end.
Near-its middle the adjustable extension block
weight of the roller, to which must be added the
weight of, the heavy gear 32 affixed thereto, has 36 is provided with a threaded bore. extending
been found objectionable in that it caused the. therethrough from top to bottom and within. this
forward‘
end of the-blank, especially if the'blank threaded bore is a'screw 48 (Figs, 2 and 4) whose 25
25
upper end abuts against the under side of the
were soft or spongy, to be “nipped” or disfigured;
that is the entering edge of the blank would be bar 35 at'a point midway between‘ the two screws
crushed or pressed down by the weight of the
roller and gear and the knife would momentarily
gouge or cut deeper into the blank at the start
of the skiving operation than it would after the
forward end of’ the blank had passed the cutting
edge“ of ‘the knife. This objectionable action was
' _. presumably'due to the weight and inertia of the
roller *andits gear and was more pronounced
when ‘the blank was soft and ?exible than when it"
was harder and ‘more rigid, but’ in all cases it
was apt to occur to some extent.
'A principal object of the present inventionis to
401 provide means automatically to lift the gauge
roller and its gear to permit the forward end of
the blank to move into» proper position in the
skiving mechanism without being subjected to the
duty of lifting the roller. The gauge roller 28,
45
29, which is also a single upper feed roller for
propelling ‘the blanks past the knife 13, is lighter
than heretofore,'the core 28 being constructed of
a hollow tubular metal cylinder. ' The ends of the
cylinder28arejournaled in bearing boxes 30 which
' slide vertically in Ways 3| provided at opposite
50 sides of the frame of the machine, and on one end
of the roller shaft, outside of the frame, is ?xed a
gear'32,‘ which is continuously driven by the usual
gear‘ 33,,which in turn is continuously driven by
" the usual'gear 34 fast on themain driving shaft
55 ' vi 5. 0n the intermediate part of the hollow cylin
der 28v between, its ends is secured, by cement or
otherwise,‘ a cylindrical cover or sheath 29 of
rubber or other yielding resilient material.
38 and'opposite thermiddle» of the roller 28, 29.
As each blank reaches and is engaged by the
feed and gauge roller 28, 29, it is ‘slid forwardly
on the supporting bar 35 and against the cutting
edge of the knife 13 which skives off va slice or
shaving of uniform ‘thickness from. the under
side ‘of the blank, which‘ is the ?esh side. The
thickness of, this'skiving may be varied by ad 35
justing the bar 35 toward or-away from the knife
by means of the hand wheel 46. V The adjustable
abutments' 52 on slide bar liihave already been
adjusted 'bythe detecting means to limit theex
tent‘ of the movement of separation of the roller
28, 29, from the skiving knife, to accord. with the
thickness of the thinnest spot found by the de
tecting means.‘ Consequently the roller will at
all times/maintain the required pressure on the
blank to insure proper ?eshing. When the roller
encounters thicker areas of vthe‘blank the resilient
cover 29 will yield to permit the blank to pass
without‘affecting the position of the rigid sup
porting bar ‘35 or the depth-of the skiving.
‘Since all blanks move along a path substantial
ly in the median line of the machine, the middle
part of, the bar 35 will be subjeetedto the greatest
wear. To compensate forthe wearing down of _
the middle of the bar 35 and to- maintain a true
supporting surface over which theblanks slide, the 55
sores/‘48 may be adjustedto bend or spring the
middle of the bar upwardly toward the roller. The
screw48 is ?xed-in its adjusted position by means
of a check nut'49.
V
»
'
Directly beneath the roller 28, 29, and parallel
60
therewith, is a rigid non-rotating supporting bar
35, preferably of hardened steel, ‘providing a
smooth surface uponiwhich the blanks slide in
The new automatic roller lifting mechanism in
cludes a coiled spring 53 (Figs. .1, 2, 3 and 5) one
end of which is connected with a lug on top of the
bar 50, and the other end of which is connected to
theirv movement against the skiving ‘knife [3 as
65 they are fed forward by the roller 28, 29. The
bar 357 is fastened near its ends by means of
screws 38 (Figs. 2, 3, and 4) to a block of metal 38
which is, to all intents and purposes, a separately
adjustable section or extension of the usual bed
plate-37 of the machine. Said extension block
38-is provided with a pairof arms 39 which ex
tend under the main bed plate 31 and are pivotal
ly connected to lugs 3'!’ on the bed plate at 49
, so [as to_swing on-ahorizontal axis. A pair of
a horizontally and transversely disposed leverr54,
70
‘springs ‘62 (Fig.4) ‘disposed between the block
fulerumed at 55 on the frame of the machine. >
The bar 50 ‘is ?xed to the two bearing boxes of
the gauge roller 28, 29. The free end of lever 54
rests on onearm of a smaller lever 56 fulcrumed
at 51 on .the frame of the machine'and the other
arm ‘of lever 5li~is arranged to cooperate with a 70
‘cam 58 .onashort-shaft 59. Shaft 59 carries a
gear 60 .of the same size as, and .me-shing with,
the gear'M-On cam shaft'25 by which the plunger
26 of ‘the marking‘ wheel is operated.
.
"When the 'gear‘24 is caused to make one revo
75
2,107,634
lution and stop, as above described, a single
rotation is imparted by it to gear 60 and cam
58, and the latter acts through lever 56 to lift
lever 54, which in turn acts through spring 53
to liftthe gauge and feed roller 28, 29 and its
gear 32, until the upward movement of the roller
is arrested and limited by the engagement of
the wedge-like blocks 5|, on the‘ bearing boxes,
with the wedge-like abutments 52 on the under
side of the slide bar l4. Although the action of
the cam 58 and the leversv 56 and 54 is positive
and constant, the spring 56 constitutes a yield-v
ing element in the roller lifting mechanism which
permits the roller to be arrested at various ele
15 vations according to different adjustments of
the abutments 52.
Thus it will be seen that the depression of the
trip 2! by the blank as it approaches the skiving
mechanism acts both to operate the marking
mechanism and to lift the gauge roller of the
skiving mechanism before the blank engages the
gauge roller so that the forward end of the blank
is relieved of this work and the nipping, gouging
and deformation of the forward end of the blank
25 are avoided.
It is a desirable feature of the roller lifting
mechanism that the lug 6| on bar 50 to which
the lower end of the spring 53 is attached is
positioned at substantially the center of gravity
of the gauge roller 28, 29, and its gear 32 so
that the roller tends to move away from the skiv
ing knife substantially equally from end to end
without any strong tendency to tilt.
The above described roller lifting mechanism
35 is obviously applicable whether the skiving mech
anism is designed for fleshing or for evening.
In Figs. 1 to 4 above described, the skiving
mechanism is shown in a form designed for ?esh
ing leather blanks.
Fig. 5 illustrates the roller lifting mechanism
40
applied to an evening mechanism, that is, a skiv
ing mechanism which reduces the blank to a
uniform thickness throughout corresponding to
the thickness of its thinnest spot, instead of
45 skiving off a cutting of uniform thickness, as is
done in fleshing machine, leaving the original
variations of thickness in the blank. In Fig. 5‘
the gauge and feeding roller 28a has a solid un
yielding surface, as is usual in evening ma
50 chines, and once it has been lifted to the extent
limited by the abutments, which have been ad
justed to accord with the thinnest spot in the
blank, it will not yield farther. The lower blank
supporting member is in the form of the usual
55 roller 53, (or it might be in the form of a non
r'otating supporting bar 36 as shown in the flesh
ing machine) and is supported on the usual
springs 64. As thicker parts of the blank pass
through the skiving mechanism the lower sup
60 porting member 63 yields downwardly and
causes thicker cuttings to be skiv-ed off, thus
evening the blank down to a uniform‘thickness
throughout corresponding to the thickness of
the thinnest spot. The construction and opera
65 tion of the roller lifting mechanism applied to
the evening mechanism is the same as that de
scribed in connection with the fleshing mecha
nism.
70
I claim:
1. In a machine of the character described,
skiving mechanism including a skiving knife, a
vertically movable gauge roller and an adjust
able abutment to limit the extent of the move
ment of separation of the gauge roller from the
75 skiving knife, and mechanism controlled by the
3
blank during its passage through the machine
to lift the gauge roller to the extent permitted by
the abutment before the blank engages the gauge
roller.
2. In a machine of the character described,
skiving mechanism including a skiving knife, a
vertically movable gauge roller and an adjust
able abutment to limit the extent of the move
ment of separation of the gauge roller from the
skiving knife, and mechanism including a trip 10
in the path of the blanks and actuated by each
passing blank to lift the gauge roller to the ex
tent permitted by the abutment before the blank
engages the gauge roller.
3. In a machine of the character described, 15
skiving mechanism including a skiving knife, a
vertically movable gauge roller and an adjust
able abut-ment to limit the extent of the move
ment of separation of the gauge roller from the
skiving knife, and mechanism controlled by the 20
blank during its passage through the machine
to lift the gauge roller to the extent permitted
by the abutment before the blank engages the
gauge roller, said lifting mechanism including a
yielding element adapted to permit the gauge 25
roller to be arrested at various elevations accord
ing to different adjustments of the abutment.
4. In a machine of the character described,
skiving mechanism including a skiving knife, a
vertically movable gauge roller and an adjust 30
able abutment to limit the extent of the move
ment of separation of the gauge roller from the
skiving knife, lifting means to lift the gauge
roller to the extent permitted by the abutment
before the blank engages the gauge roller, mark 35
ing means responsive to the detecting means,
and a trip in the pathv of the blanks and actuated
by each passing blank adapted to operate both
the lifting means and the marking means.
5. In a machine of the character described,
skiving mechanism including a gauge feed roller,
a skiving knife and a non-rotating supporting
bar opposed to the roller and having a smooth
surface upon which the blank slides in its move
ment against the skiving knife, and means to 45
spring the middle of said bar toward the skiving
knife to compensate for wear of the bar.
6. In a machine of the character described,
skiving mechanism including a gauge feed roller,
a skiving knife and a non-rotating supporting 50
bar opposed to the roller and having a smooth
surface upon which the blank slides in its move
ment against the skiving knife, means to adjust
the bar toward and from the knife, and means
to spring the middle of the bar toward the knife
to compensate for wear of the bar.
7. In a machine of the character described,
skiving mechanism including a skiving knife, a
vertically movable gauge roller and an adjust
able abutment to limit the extent of the move
ment of separation of the gauge roller, from the
skiving knife, a non-rotating supporting bar
opposed to the gauge roller and having a smooth
surface upon which the blank slides in its move
ment against the skiving knife, and means to
spring the middle of the bar toward the knife to
compensate for wear of the bar.
8. In a machine of the character described,
skiving mechanism including a skiving knife, a
vertically movable gauge roller and an adjust
able abutment to limit the extent of the move
ment of separation of the gauge roller from the
55
60
65
70
skiving knife, mechanism controlled by the blank
during its passage through the machine to lift 75
4
2,107,634
the gauge roller to the extent permitted-by the
abutment before’ the blank engages the gauge
roller, and ‘a non-rotating supporting bar op-v
posed to the gauge roller and having a smooth
surface upon which the blank slides in its‘ move
ment against the skiving knife.
9. In a machine of the character described,
skiving vmechanism including a skiving knife, a
vertically movable gauge roller and adjustable
roller to the, extent permitted by the abutment
before the blank engages the roller. -
‘10. In a machine of the character described,
grading means, a' vertically movable feed roller
for feeding the blanks out of the machine, and 5
mechanism’ controlled by the blank during its
passagethrough the machine to lift the feed
roller before the blank‘ engages the feed roller.
11. In a machine of the character described,
abutment to limit the extent of the movement of
grading means, a vertically movable feed roller
separation of the gauge roller from the skiving
knife, a rigid supporting member opposed to the
[for feeding the blanks'out of the, machine, and
' gauge roller, said gauge roller having a cylindri
mechanism including a trip in the path of the
blanks and actuated by each passing blankto
cal cover of yielding resilient Hmaterial, and v lift the feed roller before the blank engages the
115 mechanism controlled by the blank during its
passage through the machine to lift the gauge
feed roller.
7 V
'
JAMES W. JOHNSTON.
15
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