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Патент USA US2123171

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July 12, 19381
2,123,111
'A. E. HAMILTON
POLISHING APPARATUS
Filed Nov. 14, 1956
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July ‘12, 1938.
TA. E. HAMILTON
‘2,123,171
POLISHING APPARATUS
Filed Nov. 14/1936
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‘July 12,1938.
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'AEHAMILTON
2,123,111
POLI SHING APPARATUS
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POLISHING APPARATUS
Filed NOV. 14, 1936 ’
8 Sheets-Sheet 5
July 12, 1938.
A. E. HAMILTON
2,123,171
POLISHING APPARATUS
Filed Nov. ‘14,1936
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A. E. HAMILTON
2,123,171
POLISHING APPARATUS
Filed Nov. 14, 1936
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July 12, 1938.
A. E. HAMILTON
2,123,171
POLI SHING APPARATUS
Filed Nov. 14, 1936
8 sheets-sheet 8
Patented July 12, 1938
2,123,111 Y
2 UNITED STATES
PATENT OFFICE
2,123,171
POLISHING APPARATUS
Alfred E. Hamilton, Pittsburgh, Pa.
Application November 14, 1936, Serial No. 110,863
8 Claims.
My invention relates to polishing or abrading
machines and is hereinafter described as em
ployed in the polishing of knife blades or the like,
although it will be apparent that it may be em
ployed in the polishing and ?nishing of other
articles.
‘ One object of my invention is to provide means
for effecting a cross-polishing of the blanks simul
taneously with a polishing operation, in directions
length-wise of the blanks, and wherein the em
ciency of the cross-polishing operation will be the
same regardless of the length of feed stroke em
ployed in directions length-wise of the blanks.
Another object of my invention is to provide
15 mechanism for moving the blanks in directions
longitudinally of the rollsduring advancing and
retracting movements thereof between the rolls,
with a V vibratile-reciprocatory motion derived
from a hypocyclic crank movement.
.
Another object of my invention is to- provide a
simpli?ed automatic stopping mechanism that is
readily adjustable to permit the desired number
of abrading ‘ strokes or the proper number of
polishing strokes, whereby the danger of under
.
.
_
-
v
_
.
the rolls being moved into engagement with the
blades to e?fect a polishing ‘operation thereon
as they are being withdrawn from between the
rolls. Each roll is provided with a driving motor.
Mechanisms are provided for oscillating the 5
rolls and for reciprocating the blade holder in
synchronism, and after the blades have been
subjected to a predetermined number of polish
ing strokes, an automatic stopping‘device is actu
ated to stop the operation of the machine, there- 10
by assuring proper polishing of the blades. The
length of stroke of the blade-reciprocating mech
anism is, of course, adjusted to permit polishing
of blades of various lengths. Provision is also
rn'izde for adjusting the polishing pressure of the
ro ls.
.
-
15
Simultaneously with reciprocation of the blade
holder toward and away from the rolls,vmotion is
imparted to the holdernto move it in directions
longitudinally of the rolls with a vibratile-recip
rocatory motion derived from a hypocyclic crank
movement, whereby the points of engagement be
tween the rolls and the blades: are constantly
changing at a variable rate‘of “speed iii-‘directions
longitudinally of~the rolls, and‘ thereby a more
25 working or over-working of the blanks is elimi
nated.
(on. 51-84)
-
A further object of my invention is toprovide
a machine of such form that the various working
parts can readily andeasily be adjusted; where
30 in the parts are fully protected against entry of
abrasive and other foreign material, and which
shall be capable of emcient and continuous oper
uniform‘ polishing action is effected regardless
2f irregularities and unevenness "of the roll sur
aces.
,
Referring now more particularly. to Figs. 1, 2, 3
. and 8, the machine comprises a base I!) on which 30
is mounted a roll stand comprising a pair of up
rights Ii. The uprights carry cross-bars l3 and
i,
M which are journalled in the uprights at l5
In the accompanying drawings, Figure 1 is a and I6 respectively, for rocking movement about
35 front view of the machine; Fig. ‘2 is a plan view
‘ their respective axes. The rods l3v and I4 re- _
thereof, partly in section;- Fig. 3. is aside view spectively ‘carry brackets l1 and I8, which are
thereof; Fig. 4 is aview on an enlarged scale rigidly secured to their respective rods. The
ation.
taken on the'line IV-IV of Fig. 1; Fig. 5 is an
enlarged view‘ taken on‘the line V~V of Fig. 3;
40 Fig. 6 is a view taken on the line VI—VI of Fig.
4;1Fig. 7 is a view taken on the line VII—VI_I of
Fig. 6; .Fig. 8 is a view, on an enlarged scale,
‘taken on‘ the line VIII--VIII of Fig. 2; Fig. 9 is
a view taken on the line IX-IX of Fig. 8, and
Fig. 10 is a sectional plan view of the structure of
Fig. 9.
Brie?y, the structure embodying my invention
comprises a. roll stand on which a pair of opposed
rolls is pivotally supported for periodic oscillatory
movements about parallel axes, in directions to
ward and away from each other. A blade or
blank holder is supported for reciprocation in a
rectilinear path to move the blades carried there
by forwardly between the rolls when they are in
55 spaced-apart position, and to withdraw the blades,
bracket I‘! is connected to its associated rod or
cross-bar‘ I3 by means of a pair of bearing bosses
20 and a boss 2|, which are formed on the bracket
l1, and through which bosses the rod l3 extends.
Each of the bosses 20 and 2| is provided with a
set-screw or a keying device which will hold the
bracket l‘l against movement relative to the rod ‘
l3, so that the bracket and the rod can be oscil- 45
lated in unison about the axis of the rod in a
manner to be hereinafter described. The lower
bracket I8 is similarly connected to its associated
rod I4.
‘
A bracket 22 is connected to the bracket I‘! at
one point by means of a pivot bolt 23, which has
threaded connection with the bracket l'l, as
shown more clearly in Figs. 2 and 8. The bolt
23 ‘extends through the midpoint of the bracket
22, so that the bracket 22 will have pivotal adjust- 55
2
2,128,171
ment on the bolt. The bracket 22 is adjustably
connected to the bracket I1 by stud bolts 24, 26
and 26, which have threaded connection with the
bracket 22, and whose shanks extend through
slots in the bracket H, as shown more clearly in
Fig. 1, so that the bracket 22 can be set in
various angular positions with respect to the
bracket l1.
.
The bracket 22 has forwardly projecting jour
otally connected at its upper end to an arm 66
that is rigidly secured to the journal extension
36 of the bracket 22, so that when the rod 66 is
raised and lowered, the bracket l'l, together with
its associated bracket 22 and roll 32, is oscillated
about the axis of the bar ii. The bracket IT has
pivotal connection with one end of a link 68,
whose other end is pivotally connected to a lever
61 that is pivotally mountedat 62 to the upright
shaft 3|, which carries a polishing roll 32. The
H (Figs. 2, 3 and 8). The lower end of the lever 10
6| is pivotally connected to a link 63 which has
roll may be faced with any desired abrasive or
polishing material such as emery, polishing rouge
will be seen that by reason of the link connec
10 nals 30 in which are supported the ends of a
etc., and is here shown as built up of a series of
15 fabric discs which are assembled on the shaft
pivotal connection also with the bracket l8. It
tions referred to, the-weight of the bracket l6
and the parts carried thereby, which tends to 15
and held thereon by clamping discs 34, which may cause them to move downwardly, will be counter
be held in snugly assembled relation by means balanced by the weight of the upper bracket l1
of clamping nuts and collars, such as indicated and the parts it supports, and that when the
at 65 and 36, that are carried by the shaft 3|. upper roll is moved to a given vertical position,
20 .The fabric discs are, of course, yieldable, and _' the lower roll will be correspondingly shifted in 20
the opposite direction. I
I
other material such as rubber could be substi
The lower end of the push and pull rod 55 is
tuted therefor if desired. .For initial grinding
and polishing, the discs may have peripheral faces pivotally connected to a lever 65 whose one end
or ‘edges of emery, or be impregnated, with emery is pivotally connected tothe frame II at 66. A
25 or the like. The roll shaft 3| is driven from an yoke 61 loosely fits over the forward end of the 25
electric motor 38 that is bolted to the bracket 22. lever 65 and is yieldably urged toward the base
by a spring 68. An adjusting screw 69 is provided
The bracket H has a yoke-like extension carry
ing adjusting screws 40 and 4| (Fig. 1), whose in the yoke 61 and bears against the upper edge
ends engage a boss 42, projecting rearwardly from of the lever 65, so that the spring tension on the
30 the bracket 22. With the screws 24, 25 and 26 lever can be varied. The tension exerted by the 30
loosened, the screws 40 and 4| can be turned to
effect adjustments of :the bracket and the roll
32 carried thereby, relative to the bracket l1,
about the pivot bolt 28 as an axis. The brackets
35 can be tightly secured in any such adjusted posi
tion by then tightening the bolts 24, 25 and 26.
The roll 82 is thereby adjusted relative to a co
spring 68 yieldably urges the rolls toward one an
other and determines the polishing pressure ex
erted by the rolls.
The work-supporting and feeding mechanism
includes a casing 18 which has a ?anged base that 35
is slidably adjustable in slideways formed in the
base ID, as shown more clearly in Figs. 1, 3 and 5.
operating roll 44 which will be of similar con
struction to the roll 32.
The roll 44 is mounted upon a shaft 45, that is
40
journalled in extensions 46 of a bracket 41 which
is of a form similar to the bracket 22 and is con
nected to its bracket l8 by a pivot bolt 48. The
bracket 41 is adjustable on the bracket I8 by stud
45 bolts 56, 5| and 52 and screws 53 and 54 which
Adjustment of the casing 10 on the base It is
effected by a screw 1|. This adjustment is pro
shaft 45 is driven by an electric motor 81 that is
mounted on the-bracket 41.
It will be understood that knife blades, or other
50
articles to be ground or polished, will pass be
tween the rolls 32 and- 44, and that in order to
effect proper and uniform polishing action, the
15 carries a worm 11 which meshes with a worm
wheel 16. The worm wheel 18 is bolted to a
respectively correspond in function and operation
to the members 24, 25, 26, 40 and 4|. The roll
rolls must be properly spaced apart and be angu
55 larly adjustable relative to one another, in order
to compensate for unevenness in wear at various
points throughout their lengths. It is for this
reason that the adjustments above referred to
are provided.
The rolls are supported by links or rods for
60
vertical movement relative to one another where
by they can be separated to permit the insertion
of blades or other articles to be ground or pol
ished, and then brought into operative relation
65 with said blades to effect a polishing operation
thereon while the blades are being drawn from
the rolls. The rolls are driven in such direction
that they exert a drag on the articles as they are
being withdrawn from the pass of the rolls, dur
70 ing the polishing action. In other words, during
the polishing operation, the roll surfaces in con
tact with the blades are moved in a direction
opposite to that in which the blades are being
moved.
75
A vertically movable push rod or link 55 is piv
vided in order to position the casing 18 relative 40
to the rolls to permit of polishing blades of vari
ous lengths.
The casing ‘I6 supports a motor 12, which is
provided with a shaft that carries a pinion 16
(Fig. 4). The pinion drives a gear wheel ‘I4, that 45
is mounted on a shaft 15 that is journalled in
bearing brackets 16 (Figs. 4 and 5). The shaft
supporting plate 18 that is formed integrally with 50
one end of a shaft 68, the shaft 65 being jour—
nalled in a bearing sleeve 8| that is carried by the
casing 10.
'
A second plate or disc 16a is secured to the
plate 19 in back-to-back relation thereto, and on 55
its inner face is provided with a bearing boss 62
for supporting the shaft 83 of a bevel gear 64.
The other end of the shaft 82 is threaded for
engagement with a crank member 65 that carries
a crank pin 86. The member 85 is‘ slid
ably adjustable by the screw shaft 83 in guide
wings or bosses 81, that are formed on the face of
the disc 19a.
Rotative adjustment of the crank pin 86 radi
ally of the worm gear 18 is effected by a bevel 65
pinion 88 that meshes with the gear 84. The pin
ion 68 is mounted on a shaft 88 that extends cen
trally through the shaft 88. The shaft 68 is
squared at its outer end for the reception of a
wrench or handle. It will be seen that the shaft 70
80, shaft 89, bracket 82 and crank pin member 65
rotate as a unit with the worm wheel 16.
The
adjustment of the shaft 88 is for the purpose of
varying the “throw” of the crank pin 86, since its
radius of movement, and therefore the length of 76
a
,
3
2,123,171
throw, will vary with its distance from the axis of
- the worm wheel 18.
ried by the lower plate ‘I I8 serve to detachably ee
clauil'e the work holder II8 to the supporting plate
The crank pin "carries a slide block 99 which
The arms WI and I92 at their upper ends carry
“is disposed within a slot 8| in a lever 92, the lever"
92 being pivotally mountedcn a shaft 93 that is bearing housings I24 and I25 respectively, for the
journalled in bosses projecting upwardly from the _ shafts on which the links I93 and I 94 are mounted
(Figs. 1, 2, 3 and 8). At their‘ lower ends, the
bottom of the casing. ‘ The upper end of the lever
92, as shown more clearly in Figs. 4 and 6, has
pivotal connection with a link 94, that is in turn
connected to a rack bar 95. The rack bar 95 is’
positioned between guide plates 96 which are car
ried by the casing 19, and is provided with teeth on
its opposite faces that are in mesh with segmental
gear members 91 and 98, respectively.
15
The gear members 91 and 98 are mounted on
vertical shafts 99 and I99, respectively, that are
Journalled in the casing ‘I9. The upper ends of
the shafts are connected to cranks MI and I92,
respectively, which in turn are respectively con
20 nected to links I93 and I94. The links I93 and
I94 at their free ends are journalled on a stub
shaft I95 (Figs. 8 and 9), which is carried by an
anti-friction roll cage I96.
The roll cage I96, as
shown more clearly in Figs. 8, 9 and 10, consists
25 of a top plate having downwardly extending mar
ginal ?anges forming an inverted box which en
closes a plate member I89 of a carriage I91. Anti
friction rollers I8I that are held in assembled re
lation within a roller cage I82 are interposed be
arms MI and I92 are supported on the shafts 99
and I99, above referred to, which are in turn sup
ported in the‘ casing 19. The supporting shafts
at the points‘ of pivotal connection of the arms
IM and I92 and the links I93 and I 9‘4‘are effec
tive to prevent horizontal de?ection or sagging of
the arms and the work holder.
Oscillation of the rock shaft III and the guide 15
track I99 to reciprocate the work holder and the
knife blades longitudinally of the rolls, while in
the roll pass, is effected by ‘a crank or lever arm
I26 (Fig. '5) which is rigidly secured to the rock
shaft III. A link or connecting rod I21‘ is‘ piv 20
otallyconnected to the outer end‘ of the lever arm
I26, and atits lower end is connected to-a crank
or an extension I28 of a crank shaft I29 (Figs. 5
and 6). The shaft I29 is iournalled in a rotating
barrel or cage I39 which in turn is formed on the 25
end ‘of a shaft I3I, that is journalled on a sup
porting plate I32 which is detachably bolted to the
end of the casing 19.
The plate I32 has a cylindrical projection I33
within
which is formed a bearing surface for sup
tween the top of the plate member I89 and the
under side of the upper plate portion of the roll ' porting the barrel I39. An internal gear I34 is
mounted within the extension I33 and meshes
cage I96. A neck portion I83 connects the sup
30'
porting plate I89 with the frame of the carriage ' with a gear ‘wheel I35 that is secured to the shaft
I91 and extends through an elongate slot I84,
formed in a sectional bottom plate I85 that is
secured to the marginal ?anges of the cage I96.
Anti-friction rollers I86 and I81 are disposed at
opposite sides of the neck I83 in position between
the bottom plate I85 and the under side of the
40 plate member ‘ I89., The carriage I91 is thus sup
ported in suspension by the roll cage I96 at the
ends of the arms I93 and I94.
The carriage I91 is provided with grooved
wheels I98 that engage a track bar I99. The bar
46 I99 is, at its ends, ‘mounted upon arms I I9 of a
rock shaft III, that is iournalled in the housing
19. It will thus be seen that by oscillating the
shaft III, the bar I99 will be moved in directions
indicated by the arrows in Fig. 5 and move the
carriage I91 ‘relative to the roll cage I96 in direc
tions parallel to the axes of the rolls 32 and 44.
This movement of the carriage is effected inde
pendently of its movement toward and away from
v the rolls, for a purpose to be hereinafter described.
65
The carriage member I91 has a bracket I I5,
which carries a work holder. The ends of the
bracket II5 (Figs. 8, 9 and 10) have threaded
bosses for the reception of adjusting screws H6.
The upper ends of the screws II6 are rotatably
connected with a supporting plate I I1. The work
holder comprises a pair of hinged plates II8
which are hingedly connected and which are
adapted to grasp or clamp blades or other work
pieces II9. A pair of threaded eyebolts I29 have
I29. The shaft I 29 is journalled eccentrically of
the shaft I3 I, so that when the shaft I3I is driv 35
en, as hereinafter explained, the gear wheel I34
will cause rotation of the gear wheel I 35, during
rotation of the shaft I3I, whereby the crank I29
will be rotated on its own axis during movement
thereof in a path concentric to the axis of the 40
‘barrel I39 and the shaft I3I, thereby producing a
hypocycloidal- motion which, through the con
necting rod I21 and the rock shaft I II, will be
transmitted to ‘the track I99, and produce avi
bratory and reciprocating movement of said .45
track I 99 and the work holder, in directions longi
tudinally of the ‘polishing rolls.
'
This combination of short vibratory movements
with the longer reciprocating movements, in.di- '
rections longitudinally oflvthe rolls, results in a 50
better and more uniform polishing of knife blades
and the like, than would be possible with simple
reciprocatoryr movements, thereby avoiding a
tendency toward zones of very high polish and
contrasting zones which‘lare less brightly polished, 55
or in other words, eliminatingv streakiness of pol
ishing which is frequently‘ present when the
blades are simply reciprocate'd longitudinally of
therolls while being moved into and out of the
roll pass.
,
>
60
'
The shaft I3I carries a bevel gear I31 which is
driven from a bevel pinion-v I38 that is secured to
a shaft I39. The shaft I39 is journalled in bear
ing bosses upon the supporting plate I32. A pin- 4
movable into slots in the edge of the upper plate,
whereupon nuts I2I can be employed to clamp the
ion I49 is secured to the shaft I39 and is driven by 65
a gear wheel I4}, that is bolted to the supporting
plate 19,- which as heretofore explained, has con
plates together, then ?rmly hold the work pieces
nection with the worm wheel 18.
65 swivel connection with the lower plate I I 8 and ‘are
I I9. The blanks or work pieces I I9 are preferably
70 formed with notches in the edges of their shanks,
as shown more clearly in Fig. 10, for engagement
with studs I22 on the lower plate I I8, whereby an
interlocking effect is had, which prevents pulling
the blades out of the holder under the frictional
drag of the polishing rolls. Angle clips I23 car
.
Another important feature of my construction
resides in the fact that adjustmentf of the
throw'of the crank 85, as heretofore referred to,
which moves the work into and out of theproll
pass,‘can be made to suit various lengths of knife
blades or the like, in order to effect proper polish
V70
ing thereof, but such adjustment will not affect 75
8.10am
the vibratory and reciprocatory movements above
referred to. In other words, shortening of the
feed stroke into and from the'roll pass will not
reduce the amplitude of vibratory movements in
directions longitudinally of the rolls, so that the
efficacy of the cross-polishing action remains the
same regardless of the length of feed stroke em~
ployed.
The actuation of the lever 65 to effect move
10 ment of the polishing rolls 32 and 44 toward and
from one another, is effected by the worm wheel
18 which carries a roller I48 (Figs. 1 to 6), which,
during rotation of the wheel, periodically engages
a camming extension I49 of a crank I50, which
15 is secured to a shaft I5I, that is journalled in
the casing 10. At its outer end, the shaft I 5|
carries? a lever arm I52 which in turn carries a
push pin I53 that engages a groove in the under
side of the lever 65. It will be seen that as the
20 rock shaft I5I is oscillated during rotation of
the worm wheel 18, the lever 65 will be periodi
cally raised to effect separation of the polishing
rolls.
‘ This separating movement of the rolls occurs
25 just when the blanks are being advanced into
the roll pass, or between the rolls, through for
ward movement of the carriage I01, as hereto
fore described.‘ When the carriage is fully ad
vanced, the lever 65 will be permitted to descend
30 and bring the polishing rolls into engagement
with the knife blades or other‘work pieces at
points ‘adjacent ‘to where they are clamped by
the work holder. Thereupon, with the rolls ro
tating, the carriage is retracted in a direction to
36 draw the work from the roll pass, and the vi
bratory movements in directions longitudinally
of the rolls, as heretofore described, are simul
taneously effected.
A guard or shield I55 is provided for preventing
the operator getting his hands caught between
the rolls (Figs. 3 and 8). The shield is mounted
upon a rock shaft I56 that is journalled in the
bearing bosses 30. A crank arm I51 is secured to
the rock shaft and has connection with a link
movement is imparted to the pinion I13 to ad
vance the rack bar, by the cam I82 which car
ries a pin I14 which, during each rotation of the
cam, will engage one of the teeth of’ the pinion
I13 and impart slight rotative movement there
to. The cam I62 will make one complete rota
tion for each cycle of reciprocation of the work
holder toward and from the roll pass. At certain
adjustments of the rack bar and push rod, the
cam I62 may rotate perhaps five times before 10
the rack bar is advanced far enough to actuate
the lever I10 that breaks the motor circuit.
After the motor circuit has been broken, as
above described, the rack bar and its rod I61 will
be manually pushed back-away from the lever
I 10.
Scale markings can be placed on the rod
I61, so that it can readily be pushed back such
distance that a desired number of rotative move
ments will be imparted to the pinion I13 before
the motor circuit is broken. The retractive 20
movement and adjustment of the rack bar, of
course, turn the pinion I13 backwardly, the pin
ion being at that time out of engagement with
the pin I14, and hence free to rotate.
The automatic stop mechanism eliminates too
many strokes on abrasive operation, thereby pro
tecting against wearing the material too thin,
and, also, assures that for finishing operations
the'work will be given a sufficient number of
strokes to obtain uniformity of polishing.
30
A cycle 01' operations is initiated when the
vertical push rod 551s in its upper position and
the polishing rolls 32 and 44 therefore separated,
with blanks II9 secured in the work holder, the
driving motors for the rolls 32 and 44 being nor
mally constantly driven. The motor 12 is start
ed, whereupon the work holder will be advanced
to move the blanks between the rolls, this move
ment being effected by the crank 85 which,
through the lever 92, rack bar 95, cranks IOI and 40
I02, and links I03 and I04, moves the work
holder toward and from the roll pass. When
the blanks have been entered between the rolls,
the cam roller I48 will pass oiT the extension I49
45 I58 whose lower end is connected to a lever I59
of the crank shaft I5I, thus releasing the rod 45
and allowing the lifting lever 65 to descend, and
the rolls 32 and 44 to move against the blanks.
The crank 85 will then have reached the point
shield I55?w'ill"etherefore. be periodically raised
and lowered-during-the operation of the mecha
away from the rolls, during which movement the 50
blanks are polished.
During this retractive movement of the work
holder, it is reciprocated in directions longitudi
nally of the rolls, by the barrel I30 which func
that is pivotally mounted at I60 to the side of the
casing 10. The lever I59 carries a cam roller I6I
that has cooperative engagement with a cam disc
I62 which is .mounted on the shaft 80. The
50
, nism. The timing or adjustment issu‘ch that the
shield will be in its lower or protective position
when thecarriage I01 is retracted, and will be
55 raised automatically while the carriage is being
advanced toward the roll pass.
A complete polishing or abrading operation or
dinarily consists of repeatedly moving the work
holder toward and away from the roll pass while
60 oscillating the holder, as above described. For
example, the work holder may be advanced and
retracted five times. The number of times which
the work holder is reciprocated toward and from
the pass of the rolls, is variably and automatical
ly controlled by mechanism which includes a rack
bar I65 which is slidably supported in a bracket
I66 which is secured to the casing 10. The rack
bar carries a push rod I61 which is engageable
with a rocking lever I10 when the rack bar is
advanced to a predetermined point. The lever
I10 is pivotally mounted on the side of the casing
10 and engages the push‘button of a switch IN
to break the circuit of the driving motor 12.
The rack bar is actuated by a pinion I13 which
is journalled in the bracket I66.
Step-by-step
at which it effects movement of the work holder
tions as a crank and acts through the crank I28,
the link I21, the crank arm I26, rock shaft III,
bar I09, and guide wheels I08, to reciprocate the
holder. The work holder carriage is simultane
ously oscillated or vibrated during its movement
longitudinally of the rolls, within the path of 60
such movement. This oscillation is effected by
the hypocycloidal motion produced by the crank
shaft I28 whose pinion I35 engages the station
ary ring gear I34, so that there is a turning of
the crank I28 upon the crank member I30, both 65
acting upon the link I21.
These operations are automatically repeated
until the motor 12 is stopped; Stopping of the
motor is effected automatically by the rack bar
I65 engaging the switch-operating lever I10.
70
The rack bar is moved outwardly toward the
switch lever a predetermined distance during
each cycle of movement by the work holder to
ward and from the roll pass.
I claim as my invention:
75
2,123,171
1. Polishing apparatus comprising a polishing
roll, a work holder, driving mechanism for re
currently moving said work holder toward and
from. the polishing roll to move a work piece on
the face of the roll, a control device movable into
position to interrupt the operation of said driv
ing mechanism, means operable during move
ment of the driving mechanism for intermittent
ly advancing said control devicetoward the said
10 interrupting position, and means for adjusting
the distance of movement required for said con
trol device to become operative.
2. Polishing apparatus comprising a polishing
roll, a work holder, driving. mechanism for re
15 currently moving said work holder toward and
from the polishing roll to move a work piece on
the face of the roll, a control device movable into
position to interrupt the operation of said driv—
ing mechanism, means operable during each cycle
20 of movement of the work holder for advancing
the control device one step toward the said in
terrupting position, and means for adjusting the
distance oi? movement required for said control
device to become operative.
3. Polishing apparatus comprising a support
5
5. Polishing apparatus comprising a pair of
rolls arranged in cooperative relation and with
their axes normally in approximate parallelism, a
bracket having bearings for one of said rolls, a
support for the bracket‘means for tiltably adjust
ing said bracket on its support, to vary the rela
tive angularity of the rolls, means for moving the
rolls toward and away from one another, a work
holder, and means for moving the work holder
toward and from the roll pass in timed relation to 10
said movement of the rolls.
6. Polishing apparatus comprising a polishing
roll, a work holder, means for moving the work
holder toward the roll, in a plane generally tan
gential thereto, means operating in predeter 15
mined relation to said movement of the work
holder, for moving the roll in directions perpen
dicular to said plane, to move it out of the path
of. work carried by the holder and to then move
the roll against the work, means for withdrawing 20
the work holder from the roll, and means for
simultaneously imparting combined reciprocatory
and shorter vibratory movements to the holder in
directions longitudinally of the roll.
7. Polishing apparatus comprising a polishing
ing means, a pair of brackets each pivotally ‘ roll, a work holder, means for moving the work
mounted on said supporting means, a polishing
roll journalled in each of said brackets, the rolls
being mounted in vertically spaced cooperative
relation, counter-balancing link connections be
tween said brackets so arranged that the gravita
tional force imposed upon each bracket is trans
mitted as a lifting force to the other bracket, a
work holder, mechanism for moving the work
holder toward and from the rolls, and means op
erated in timed relation to the movement 01' the
work holder for raising and lowering one of said
brackets.
4. Polishing apparatus comprising a supporting
means, a pair" of brackets each pivotally mounted
40 on said supporting means, a polishing roll jour
nalled in each of said brackets, link connections
between said brackets so arrangedthat pivotal
movement of one of the brackets will effect move
ment of the other bracket in the opposite direc
tion, a work holder, mechanism for moving said
work holder toward and from the rolls, and means
operated in timed relation to said mechanism for
oscillating one of said brackets on its pivot.
holder toward and from the polishing roll to move
a work piece on the face of the roll, and a device
operable simultaneously with said means, for
effecting combined reciprocatory and shorter
vibratory movements of the work holder in direc
tions transversely of the path of movement of the
work holder.
8. Polishing apparatus comprising a, pair of
cooperatively-mounted polishing rolls, a pivotally
mounted bracket for each of said rolls, movable
toward and from one another, counter-balancing
link connections between said brackets, so ar
ranged that movement of either bracket in one
direction will cause movement 01' the other
bracket in the opposite direction, a work holder
movable to carry a work piece into and from the
roll pass, and means operating in synchronism
with movement of the work holder toward the roll
pass to effect separating movement of the said
brackets.
ALFRED E. HAMILTON.
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