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Патент USA US3034218

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May 15, 1962
3,034,213
G. E. MILLIGAN
ROVING CUTTER
Filed June l5, 1960
5 Sheets-Sheet 1
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INVENTOR.
May 15, 1962
G. E. MILLIGAN
3,034,213
ROVING CUTTER
Filed June l5, 1960
3 Sheets-Sheet 2
âaymo/m/ f. /17/ /?yan
INVENToR.
May 15, 1962
3,034,213
G. E. MILLIGAN
ROVING CUTTER
Filed June l5, 1960
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INVENToR.
BY
~
(/OQLQA‘»MN A. „dazi
ATTORNEYS
M@
3,ß34,2i3
Patented May l5, 1962
2
3,634,213
Gayrnond E. Milligan, 614 Knipp Road, Houston, Tex.
'
BOVEN@ CUTTER
Filed June 15, 1960, Ser. No. 36,297
11 Claims. (Cl. 39m-E28)
FIGURE 6 is a view taken along the line 6»-6 of
FIGURE l,
FiGURE 7 is a perspective view of the baclcup roller
and roving driver assembly, and
FIGURE 8 is a sectional view taken along the line
8-8 of FIGURE 6. ’
The present invention relates to a roving cutter.
Referring now'to the drawings, and particularly Vto
Reinforced plastic articles are usually reinforced with
FIGURE l, the roving cutter is generally designated by
fibers or filaments of glass and are then applied to and
the reference numeral itl and includes a body 12 which
bonded to the particular plastic article. Roving is a rope 10 includes the >various driving and cutting elements, as pres
like material of any desired number of strands or ends
ently described, the handle 1d for gripping the cutter
of fibers, such as glass fibers. Ris roving is the raw
and controlling its operation, as presently described, and
material from which chopped strand mats, one of the
the outlet i6 in which the roving cut into predetermined
cheapest forms of ñbrous glass reinforcement for plastic s lengths is discharged and separated on to a plastic form,
articles and shapes in common use, are made.
15 mold or shape to which it is desired to add chopped
The present invention is directed to an improvement in
roving.
roving cutters for cutting roving into predetermined
The body 12 is provided with the chamber 1S which is
lengths and then separating the cut strands of roving and
vclosed on each side by the cover plates 20 and 22, as
applying it to a plastic shape or article to be formed. it
best seen in FIGURE 4, for assembling the various ele
. is particularly directed to such an improved roving cutter
which may be held by hand and any desired quantity of
the cut or chopped roving may be applied to a plastic
article.
It is therefore an object of the present invention to pro
vide an improved roving cutter which may be held by 25
ments of the cutter contained in the chamber 1S and for
making repairs, replacements and the like.
‘
While »the body l2, handle 14 and outlet 16 may be
formed of any desired material, preferably it is formed
of a light weight metal to give the required strength and
rigidity and at the same time be light enough to be
hand and which effectively and efficiently cuts roving,
handled by an operator over long periods of time without
separates the strands and applies it to the plastic shape
tiring. One such material is aluminum although it will
or form or article in one operation.
be understood that any desired material may be used.
Yet a further object of the present invention is the pro
Referring again to FIGURE l, in the body 12 there
vision of such a roving cutter in which the separated 30 are provided the air or pneumatic motor 24, the pressure
strands of cut roving may be applied to plastic material
roller 26, the cutter rotor 23 and the back-up roller 39
arranged in various shapes, molds and the like where it
for the pressure roller Z6 and cutter rotor 28.
is diñicult to apply roving.
Yet a further object of the present invention is the
provision of afully portable, relatively light weight, hand
An opening 32 is provided in the lower portion of
the body 12 into which is secured the guide bushing 34
provided with the passage 36 for reception of roving. ’ It
held, roving cutter which cuts roving into predetermined
is noted that the inner end of Áthe bolt Eiland its passage
36 extend between the pressure roller 26 and the back-up
separated strands of roving'at the desired place,
roller Si) so that roving is fed between these rollers for
Still a further object’of the present invention is the
drawing it into the chamber 18 and in contact with the
provision of -such a roving cutter which is eñectively 40 blade type cutters 36’ carried by the cutter rotor 28
lengths, separates the strands and applies the cut and Y
eiiicient in operation and which is readily and inexpensive
ly operated and maintained.
for cutting the roving.
replaced and adjusted.
4S is provided in the boss 50 disposed in thevbottom S2
of the frame for threadedly receiving the adjustment screw
54, as best seen in 'FIGURE 1,'for adjus-tably supporting
In order to insure that the roving is directed toward
Still a further object of the present invention is the
the cutter rotor 28 a guide bar 3S is provided between
provision of such a roving cutter in which the back-up
the pressure roller 26 and the back-up roller 30.
roller and the cutter element are so arranged to avoid 45
The mounting details for the pressure roller 26, back-up
undue wear on the back-up roller and give extended
roller 3l) and guide bar 38 are bes-t illustrated in FIG»
cutter efficiency.
URE 7 to which reference is now made. A frame as~
Still a further object of the present invention is the
sem‘oly including the >sides 4t? and 42 receive the shafts
provision of a roving cutter provided with an improved
44 and 46 of the pressure roller 26 and'back-up roller
cutter element in which the cutters are easily and readily' 50 30 for journaling them in position. . An adjustment thread
Still aA further object of the present invention is the
provision of a pneumatic roving cutter which automath
cally and effectively lubricates 4the various parts of the
cutter.
l
Other and further objects, features and advantages of
the present invention will be apparent from the following
description of a presently preferred embodiment thereof,
taken in conjunction with the accompanying drawings,
in which like character references designate like parts 60
throughoutthe several views, and where
the back~up roller 3d with respect to the cutter rotor 2S. '
As best seen in FIGURE 6, the shaft 44 is journaled in
the side plates 20 and 22 so that manipulation of the ad
justing screw £54 causes the framer41 to pivot about the
shaft 44 so that the forward end of the frame 41, and
hence the back-up roller 30, can be moved to and away
from the cutter rotor 28.
l
Advantageously, they frame 41 also supports the de
llecting-or guide bar 38 `and maintains the pressure roller
Z6, the backaup roller 30 «and the Yguide bar 38 in a pre
FIGURE l is a side sectional view of a roving cutter
according to the present invention,
»
FIGURE 2 is -a partial end view of the roving cutter
. determined relationship at all
looking in the direction of the arrows 2_2,
65
The pressure roller 26 and back-up roller Sill have the
FIGURE 3 is a sectional view taken along the line
inner core 27 and 29, respectively, which is' covered with
3_-3 of FIGURE l,
`
a resilient surf-ace ‘31 and 33, respectively, such as one
FIGURE 4 is a sectional view taken along the line
made of rubber, neoprene or other resilient surfaces
4_4 of FIGURE l,
which effectively grip .the roving and move it through the
FIGURE 5 is an exploded, fragmentary, perspective 70 cutter.
view of the cutter rotor illustrating the manner of insert
Referring now to FIGURE 5, the details of the cutter
ing and replacing the cutter blades,
rotor 2Sy »and cutter blades 36’ and their mounting is
3,034,213
.
.
.
4
3
illustrated. The cutter rotor 28 is provided with a series
of radially extending slots 25 into which are placed the
cutter blades 36’. The leaf type springs 27’ are also
provided, only one being shown in -this view, and are
placed in the slots 25 along with the blades 36' which
releas-ably hold them in place, as illustrated in FIG
URE
l.
.
~
.
.
'
,
suitable packing, such as the `0«rings 80' «and 81' at the
inner and outer ends of the valve body 73 are provided
to elîectively seal oit -the assembly.
Still with reference to FIGURE 1, the needle valve
assembly 64 is provided to adjust the amount of air ilow
ing in the passages 65 and being ejected out the >open
ing 16. As in _case of the needle valve 60, the needle
valve 64 is also made in a complete assembly which may
'
It is ‘also noted in FIGURE 4, that the side plates 43
are secured to the sidesrof thecutter rotor 28, such as ,
be readily removed for repairs, replacements and main
by the. bolts 45, although they may be secured in other
ways, whichinclude the inwardlyextending terminal
tenance.
An annular valve body 80 is provided which is thread
edly or otherwise inserted into the counterbored portion
stop members 47 which engage the chamfer 49 of :the
blades 36'Y which assist in maintaining the blades 36’ inv
63, such as by the threaded «area 81.
position.
is provided adjacent the interior end of the valve body
v
»
.
Thus, the blades 36' may be »added quickly and con
veniently to the cutter rotor 28 by removing the side
plates 43,'pulling the blades 36’ rand springs 27’ out of
the slots 25, inserting new blades and the springs 27’ in
A valve seat 82
80 and a needle valve element 83 is provided on the
inner end of the valve stem 84 extending from the thread
ed portion 8'5 and nut 86 which is threaded through
the threaded opening 87 in the valve body 83 so that ad
. these slots 25 and re-attaching .the cover plates 43.
justment of the nut 86 adjusts «the position of the needle
The details of mounting the cutter rotor 28 are best 20 valve element 83 with respect to valve seat 82.
f illustrated in FIGURE 4 to which reference is now
The valve body 80 has «the ports 88 so that lair from
made. The shafts 35 and 37 extending from each end
the passage 62 ilows into the valve body 83 through the
' . _of the cutter Y'rotor 28 are journaled in the bearings 39
valve seat 82, out the ports S8 into the counterboredA
»and 41, respectively, disposed in the cover plates 20
portions 63 and into the passages 65 which communicate
and 22. Thus, the cutter rotor 28 is rotatably supported 25 with the passages 17 in the outlet 16.
in the chamber 18 `of `the body 12;
Referring again to FIGURE 1, the roving cutter is
pneumatically driven, and for this purpose there is pro
vided in the handle 14 the air inlet passage 54 having
As in the needle valve assembly 60, «there are provided
in the needle valve assembly 64 suitable packing ele»
ments, suchV as the O~rings 89 and 90 to suitably pack
oiî this valve assembly.
the threaded opening 56 to which is secured the air hose 30
Referring now to FIGURE 3, the air passage 62 has
58 for supplying air to the cutter -irom any suitable
-a branch member ‘91 leading to a lubricant assembly 92
source, not shown. A trigger assembly 59 provided
and to the »air passage 93 leading to the ‘air motor 94,
which Iactuates the spring pressed needle valve generally
indicated by the reference numeral 60.
as best seen in FIGURE l.
The air motor 94 is generally a rotor provided with
the helical vanes 95 and which rotor 94 is eccentrically
The air passage 54 extends up through «the handle 14
and is in communication with the counterbored portion
mounted in the motor housing 96 by the shaft 97. The
61, the air passage 62, the counterbored portion 63 at l
the other end of the passage 62 wlL'ch receives the needle'
valve generally designated by the reference numeral 64.
vanes 95 are slidably mounted in the slots 98 so that
more area to the vanes is provided in the upper portion
and the direction of rotation to eiïect rotation of the rotor
Adjustment of the needle valve 64 controls the amount 40 94. The air passage 91 is in communication with the
of
passing into the passages 65,'only one being shown,
rotor 94 through the end bearing plates and a slot 99 is
for separating the strands of‘cut roving and applying i-t
.provided to exhaust 'the air. Since'this slot 99 is only
- to the'plastic as presently described.
Referring now to the details of construction of »the '
on one side it acts as an >increasing pressure exhaust in
determining the direction ofthe motor. The air exhaust
trigger >assernbly'59, a slot 66 xis cu-t in -the upper rear 45 ed through the slot 99 enters the outlet void 100 between
Ward portion of the handle 14 into which is .pivotally
secured the .trigger 67 by the pivot 68. The upper end
of `the trigger 67 includes aV projection 69 to which is
secured the plunger 70 of the needle valve 60.
the motor housing 96 and the body 10. The extended
void 100 permits the slot 99 to be put in any close align
ment with 4the exhaust ports 101 without having to be
too careful of choking olf the exhaust. Thus, the air
The plunger 70 has the needle valve element 71 on its 50 exhausts in a direction away from the direction in which
inner end which seats against the valve seat 72 provided
the cut übers are being directed by thecutter.
in the annular valve A-body‘73 which is threaded-ly or
otherwise secured inthe counterbored portion 61, such
as by »the 'threaded tarea 74.
' . '
A bolt 75 is threaded-or otherwise secured in the bore
76 of the valve «body 73 to serve as a stop for the com
pression'spring 77 at one end. A stop member 78 is
provided adjacent the other end so that the spring 77
resiliently maintains theneedle valve element 71 seated
`
vagainst the valve seat'72.
'
'
As best seen in FIGURE 4, the rotor blades 9'5 are
generally helically mounted to provide a more eñicient
drive. A bearing ring 102 is provided which receives the
shaft 103 lfor centering the rotor 94 in the housing 96.
The shaft 97 extending from the other end of the rotor
94 is journaled through a similar bearing 104 and has
connected to its free extremity the driving gear 105.
l
The driving means from the driving gear 105 is housed
60 in the gear chamber 106 at one side of the body 12.
A series of ports 79 are provided in the valve body
73 proximate the «air inlet passage 54 so ‘that air entering
the air passage 54 flows into the valve body 73.
The ldriving means preferably is a gear train which is
best illustrated in FIGURE 8, to which reference is now
made. In this figure a satisfactory gear train is provided
' -It seems -apparent that the pressure of the air> against
which includes the idler 107 meshing with and being
‘ the _valve element 71 and the spring 77 yieldingly main 65 driven by the driving gear 105 which provides a gear re
» tain the needle valve element 71 Vagainst the rvalve seat
duction. The idler 107 engages and drives the driven
72 until the trigger 67 is squeezed which causes the pro
‘gezâräß which rotates the cutter rotor 28 (FIGURES 1
jection'69 toV move backwardly andthereby open the
an
.
.
needle valve. This, of course, permits air to ñow to
In order to provide reverse rotation to the gear 110
»the various elements as presently described. .Once the 70 which drives the back-up roller so that the4 direction of
trigger 67 isA released, however, the combined, action'of
rotation will be such that the roving is forced between the
theY air pressure Yand spring 77 immediately close the
cutter and the back-up roller (FIGURE 1) the idler gear
needle valve 60.
Y
.
„
109 engages and is driven by the idler 107, which idler
‘It is'noted~ that the entire needle valve assembly 60
gear 109 in turn engages and drives the driven gear 110
’may be removed for'repairs or replacement. Of course, 75 for the back-up roller. It is noted that the drive train
3,034,213
5
is such that there is no change in gear pitch speed» in the
easily. In' addition, a highly eflicient lubrication system
driven gear 110 from the driven gear 108.
As best seen in FIGURE 4, the details of mounting the
idler gear 107 and the driven gear 10S for driving the
is provided.
cutter rotor 28 are illustrated.
compactness and light Weight, it may be utilized in iixcd
relation, that is it may be mounted >in ñxed relation, to
plastic shapes, forms, molds and the like to be reinforced
The idler and reduction
gear 107 is provided with the shaft 111 which is journaled
in the bearings 112 at each side for rotatably supporting
the gear 107 in position.
~
While the present invention is particularly adapted for
use as a hand held mechanism, in View of its simplicity,
with roving.
The driven gear 108 is connected to the shaft 113 ex
tending »from the cutter rotor shaft 35 and is supported
The present invention therefore is well suited and
adapted to attain the objects and ends and has the ad
by the bearing 41 as previously described.
vantages mentioned as well as others inherent therein.
»In order to seal ofi-Í the cutter rotor 28 ‘and the chamber
18 from any lubricant, a bearing surface 114 is provided
by the gear hub 115, which bearing surface 114 engages
the annularly disposed packing 116 surrounding the rotor
While a presently preferred embodiment of the inven
tion has been described for purposes of disclosure, numer
ous changes in details of construction and arrangement of
parts may be made which are within the spirit of the in
vention as deñned by the scope of the appended claims.
shaft 37.
With reference to FIGURE 6, the idler gear 109 and
What is claimed is: ‘
`
driven gear 110 for the pressure roller 26 and back-up
1. A roving cutter comprising, an enclosed body, a
roller 30, respectively, are secured to their respective
pressure roller disposed in the body, a backup roller dis
shafts 44 and 46. In addition, the bearing surfaces 117 20 posed in the body `adjacent the pressure roller, a cutter
and 118 are provided which respectively engage the pack
rotor provided with cutting blades disposed in the body
ings 119 and 120 surrounding the shafts 44 and 46, re
adjacent the backup roller and Aarranged so that roving
spectively, to prevent lubricant from entering the cham’
passes between the pressure roller and the backup roller
ber in the frame 40 disposed in the chamber 1S of the
and between the backup roller and cutter rotor thereby
body 12.
'
cutting theroving into predetermined lengths, said body
While the gear train described in some >detail is
preferred, any desired drive means may be utilized in
which there is provided a gear reduction and in which
enclosing said rollers and rotor, inlet means in the body
of a size slightly larger than the roving for introducing
the back-up roller '30 and cutter rotor 23 are driven at
.the same surface or peripheral speed.
In order to lubricate the gears, and as best seen in
sure roller and the backup roller as aforesaid, an ejector
the roving into the body `and passing it between thepres
at the fonvvard end ot the body in communication with
the backup roller and the cutter rotor and provided with
FIGURE 3, a lubricant reservoir 121 is provided in the
air jets for ejecting the cut roving, a motor carried by the
upper portion of the body 1‘2 which is closed by the
body, and drive means operatively connecting the motor
threaded plug 122 being threadedly secured in the
with the backup roller and with the cutter rotor and driv
threaded area 123 of the body 12. The plug 122 is pro 35 ing the cutter rotor in one direction and the backup roller
vided with an effective seal 124 which eiïectively prevents
in a reverse direction and the edges of the cutting blades
leakage of pressure to the outside of the body 12, but is
and the backup roller at substantially the same peripheral Y
provided with a seal 125 which permits pressure to be
speed.
applied through the seal from the air line 91 into the
2. A roving cutter comprising, an enclosed body, a
branch lines 126 leading to the passage 127 so that pres
pressure'roller disposed in the body, a backup roller dis
sure is applied to the lubricant in the reservoir 121.
posed in the lbody adjacent the pressure roller, a cutter
A passage 128 is provided from the reservoir 121 lead
rotor providing with cutting edges disposed in the body
ing to the gear chamber 106, as best seen in FIGURE 4
adjacent the backup roller, roving entering the cutter
so that lubricant under pressure is always `being provided
passing between the pressure roller and the backup roller
to the gear chamber 106, as best seen in ‘FIGURE 4.
and between the backup roller and the cutter rotor, said
A lubricant discharge port 129 is provided adjacent
body enclosing said rollers and rotor, inlet means in the
a rearward portion of the gear chamber 1416 for removal
body of a size slightly larger than the roving for intro
of lubricant therefrom.
In operation, roving `is inserted into the opening 36
and up between the pressure roller 26 and -back-up roller
30. By merely pressing the trigger 67 air pressure is
ducing the roving into the body and passing it between
the pressure roller and the backup roller as aforesaid, an
ejector in the forward end of the body’ffor ejecting the
cut roving in communication with the backup roller and
applied to the motor 94 which through the reduced gear
the cutter rotor, an air motor carried by the body, means
drive drives the back-up roller 3d and cutter rotor 2S
providing air to the motor for driving the same, drive
at the same' speed and in the directions previously
means operatively connecting the motor with the backup
mentioned. This permits the blade edges 36’ to move at 55
roller and with the cutter rotor and arranged to rotate
the same peripheral speed with respect to the back-up
the cutter rotor in one direction and the backup roller in
roller 30 thereby preventing any cutting or undue wear on
a reverse direction and the cutting edges yand the backup
the back-up roller 3i). The pressure roller 26 is free turn
roller at the same peripheral speed, and air passageways
ing, the gear 109 :being an idler gear, it moves with the
in the ejector in huid communication with the means for
movement of the roving and back-up roller 3G. The 60 providing air to the motor whereby the air jetting'through
roving is chopped into the desired lengths and the air
passing out the openings 17 draw the cut roving out of
the cutter, separate the strands and direct it as desired.
=It is noted that the roving may be cut at any pre
the passageways draws the cut roving out of the body
through the ejector.
. j
,
3. The roving cutter of claim 2 where the drive means
la driving gear connected to the motor, a driven
determined desired length merely by placement of the 65 comprises
gear connected to the rotor .cutter engaging and being
cutter blades 36'. Also, as the cutter blades 36’ may
drivenby the drive gear, an »idler gear being driven by
vary in Width the back-up cutter 3i) may be adjusted for
the driving gear, and an additional gear connected to the
this diñerential so that effectively eñicient cutting of the
back-up roller engaging and being driven by the idler
roving without any undue wear on the back~up roller 3u
is obtained.
,
Y
70 gear, said gears being arranged to'drive the cutting edges
and the back-up roller at the same peripheral speed..
The amount of air provided to the outlet 65 may be
« varied, as previously mentioned, by adjustment ot the ad
justing nut 86 for whatever purpose is desired. Also, as
sembly, said trigger assembly including a spring-pressed
previously mentioned the cutter is disassembled and the
needle valve assembly normally closing the means pro
4. The roving cutter of claim 2 including a trigger as
n various parts repaired or replaced or adjusted readily and 75 viding `air to the motor but openable upon actuation of
Y apaga 13
7
>8
said ,trigger assembly Vfor providingV air Asupply tothe
plurality of ` radially extending -and circumferentially
spaced slots, at least one blade-like cutter element dis
posed'in at least one of the slots, and a leaf-like spring
motor.
e
`
'
5. A roving cutter comprising, a body, a ?rst chamber
member insertable in the slots yieldingly holding the
in the body, a pressure roller rotatably mounted in the
,
chamber, a back-up roller rotatably mounted in the ñrst Ul blade-like cutter member in the slots; 9. rTheV cutter of claim 8 where the blade-like cutter
chamber adjacent the pressure roller, a cutter rotor pro
,members'are provided with stop shoulders adjacent their
vided with cutting edges rotatably mounted in the ñrst
sides, »and including stop members secured to each side
chamber adjacent the back-up roller, means in the body
of the rotor engaging the stop members of the blade for
for feeding roving into the chamber between the pressure
maintaining the blades in the slots.
roller and back-up roller, said Vpressure roller and back
up roller feeding the roving between the back-up roller
and the cutter rotor thereby cutting the roving, an air
motor in the body apart from the Íirst chamber, the body
provided with an air passage for supplying air to the air
motor, a discharge opening at the forward end of the 15
body opening into the first chamber, a plurality of ports
arranged about the discharge opening, -air passage means
connecting the ports with the air passageway for jetting
air out the opening and drawing cut roving therethrough,
l0. A roving cutter comprising,V a first frame, a sec
ond frame mounted in the ñrst frame, a pressure roller
rotatably mounted in the second frame and provided
with shaft extensions pivotally mounting the second trame
in lthe ñrst frame, a back-up roller rotatably mounted in
the second frame adjacent the pressure roller, a cutter
rotor provided with cutting edges rotatably mounted in
the lìrst frame adjacent the back-up roller whereby roving
passes between the pressure roller'and back-up roller and
a second chamber in the body, drive means in the sec 20 between the back-up roller and the cutter rotor for cutting
the roving, means carried by the íìrst frame for rotating
,ond chamber connecting the motor to the back-up roller
and cutter rotor -for driving the same, said drive means
the back-up’ roller and the cutter'rotor, and an adjust
and rotating the back-up roller and the cutting edges of
ing element adjustably securing the second frame to the
the cutter rotor at the same peripheral speed, a lubricant
first Iframe adjacent the b'ack-up'roller whereby operation
Yreservoir in the body, a passageway in‘ì’ruid communica 25 of the adjusting element moves the back-up roller toward
tion with the reservoir and with the second chamber for
and away from the cutter rotor.`
l1.> A rotary cutter for roving comprising, a rotor, at
in fluid communicating from the air passage to the res
least one radially-extending slot in the rotor, a blade
ervoir for applying the air pressure to the lubricant in
like cutter element disposed in the slot, and a leaf-like
the reservoir, and exhaust outlet means in the second '.30 spring lmember insertable in the slot yieldingly holding
lubricating the gear means, jan additional passageway
chamber exhausting lubricated air therefrom.
Y
the blade-like cutter member in the slot.
6. The roving cutter of claim 5 including a normally
closed valve assembly in the air passage openable to
References Cited in the tile of this patent
,permit 110W of air to the motor and to the ports.
UNITED STATES PATENTS
7. The roving cutter of claim 6 including a choke 35
2,618,817
Slayter ______________ .__ Nov. 25,
arrangement in iluid communication `with the air pas
2,719,336
Stotler _______________ __V_ Oct. 4,
sage for applying air pressure to the lubricant in the
2,787,314
Anderson ____________ _; Apr. 2,
reservoir.
2,808,884.
Shaun et al. ___________ _- Oct. 8,
8. A rotary-cutter for roving comprising, a rotor, a
1952
1955
1957
1957
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