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Патент USA US2406641

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Aug. ' 27,‘ 1946. ' I
‘A. J. sIéNO'RE'r
2,405,641‘ »
vAPPARATUS FOR PRODUCING SYNTHETIC YARN
2 Sheets-Sheet 1
Filed Dec. 28, 1942‘ _
"5%6.
'
INVE_NT_OR
'
_
_. AZb'eriJJzynorei
BY
a
'
I: I M
ATTORNEY
-
‘ p
'
“- I.‘
, Aug. 27, 1946.
A, J'; SIGN'QRET
2,406,641
APPARATUS FOR PRODUCING SYNTHETIC YARN
Filed 066. 28, 19,42
'
2 6116616411666 2 I
‘INVENTPR
AlberlJJzgnoret ‘~
Patented Aug. 27, 1946
2,406,641
UNITED ’ STATES’ PATENT OFFICE
2,406,641
7
APPARATUS FoR PRODUCING SYNTHETIC
'
YARN
'
Albert J. Signoret, 'New’York, N. Y., as'signor to
American Safety Razor Corporation, Brooklyn,
N. Y., a corporation of Virginia
‘
Application December 28, 1942, Serial No. 470,350
3 Claims. (Cl. 19-129)
2
My present invention relates generally to the
tute this web as a sliver. A plurality of'these
reconstituted slivers are again subjected to at
production of a yarn from ?laments and more
particularly from synthetically produced n12.
ments.
_
i
tenuating and compacting treatment until the
*
’ desired yarn is produced.
My invention will be disclosed herein as applied
It has been suggested that the process now
employed for producing yarn from synthetically
to the production of yarn from arti?cially pro
duced ?laments.
This is not to be construed as
produced ?laments could be simpli?ed and the
indicating ‘that my invention is not capable of
apparatus required could be materially reduced
practical application in the production of yarns
if the guillotining operation were performed after
from natural ?bers. Therefore my invention is 10 the formation of the web and during and as part
not to be construed in a limited sense because of
of a gilling operation and that this could be ef
its manner of disclosure unless called for ‘by the
fected by associating cutting edges with the faller
express language of the claims. '
bars which form part of the gill vbox.
'
synthetically produced ?laments are formed by
One
of
the
objects
ofv
my
invention
is
an
ar
extruding‘ a viscous mass through small openings 15 rangement whereby cutting edges can be asso;
of spinnerettes into ?xing baths and the like.
ciated with faller bars of the gill box to cut the
When formed they are wound on bobbins. A
web into short staple lengths. This I attain gen
number of these ?laments are then brought to
erally by positioning cutting edges below the top
gether to form rope-like‘ lengths which may be
wound into compact form such as hanks to sim
plify handling. The term “hank” will herein be
employed generically to refer to these lengths and
of the needles of the faller bar fora distance
20 so that the cutting edges will cut through the
web during the normal throw or movement of
the faller bars.
.
not specifically as referring to the particular
Another object of my invention is the provi
compact formation they may be given.
of an arrangement whereby the aforemen
In accordance with the present practice the 25 sion
tioned cutting operation be performed so as to
hanks are each subjected to a guillotining opera
a?ect‘to a minimum degree, the integrity and
tion which chops them intov short stapleof a
continuity of the web. This I attain (a) ‘by em
length suitable for subsequent processing. These
short lengths are received in a receptacle or con-,
tainer to form a mass. This mass is then sub 30
jected to a treatment by appropriate apparatus .
to form the sliver of extended length and of a
\ desired thickness such as of, the order of 1".
The short lengths which comprise the sliver are
ploying cutting edges whose lengths are mate
rially less thanethe width of the Web and where
a plurality of edges are associated with a faller,
bar, to space these edges across the length there
of, and (b) by so staggering the cutting edges
that as the web progresses the cutting is per
positioned lengthwise, being multiplied in the 35 formed by each faller bar for short width posi
tioned laterally of the cuts effected by the adja
cross section thereof to give the required or de->
cent faller bars.
sired, thickness and being multiplied lengthwise
-
‘
A further object of my invention is an asso
ciation
of cutting edges with the faller barswith- ‘
A plurality of slivers arranged laterally of ‘each
other are then united to form a web and this 40 out requiring any changes or modi?cations in
the latter. This I attain in one arrangement
web is subjected to preliminary gilling and atten
by securing means attachable to a conventional
uation in an apparatus termed a gillbox, which
faller bar.
7
»
unites the slivers into a web and attenuates that
thereof to give the extended length.
'
‘Cutting edges have a relatively short life and
web in the direction of its length. The gill box
comprises what are termed faller bars which 45 require replacement frequently. It is a further.
comb into parallelism the short. lengths of which
object of my invention that the means for secur
the web is comprised.
ing the cutting edges to the faller bars be sepa
rate from the cutting edge itself to permit re
,
.
.
The attenuated web is then fed through the
restricted passageway of atrumpet to ‘form’ a
. placement at will of the latter without requiring
sliver. A plurality of these reconstituted slivers 50 replacement of the former.
in lateral relation are then subjected to a further
gilling' operation in what may be termed an “in
For the attainment of these objects and such
other objects as may hereinafter appear or be
pointed out I illustrate embodiments of my inven
termediate” gill box whereby they are formed’
into a web which is combed,~ attenuated and com-1
pacted as in the preliminary gill box to- reconsti
tion in the accompanying drawings, wherein:
55
Figure 1 is a perspective view of a conventional
2,406,641
3
gilling apparatus embodying one form my inven
tion may take;
Figure 2 is the longitudinal section through the
apparatus of Figure 1;
Figure 3 is an enlarged elevational View of a
Cfl
fragmentary section of one of the faller bars of
Figure 1 engaged through the web;
‘
'
Figure 4 is a section on line 4-4! of Figure 3;
Figure 5 is a section on line 5-5 of Figure 3;
Figure 6 is a diagrammatic showing of one
4
and 1 l of this conventional apparatus is a mecha
nism comprised of a series of taller bars each of
which is constituted of a bar l5 from which pro
jects upwardly a row of needles it spaced apart
across its length, the needles tapering to a point
I‘!
at their upper ends
(see Figure 3) .
rl‘he
length of the bar It and of the row of needles
is at least equal to the width of the web W for
reasons that will be understood as this descrip~
Vtion proceeds.
These faller bars travel between the two sets of
rollers‘ Iii and H in a path that can best be de
Figure '7 is a view similar to that of Figure 3 oi‘ , . ‘scribed as an extremely ?at oval whose long
a modi?ed embodiment of my invention;
dimension is in the direction of feed of the web.
Figure 8 is a section taken on line 8;,8 of
The fallcr bars travel in their elevated position
Figure '7 ;
‘of Figure 1 from a point adjacent the feed rollers
Figures 9 and 10 are perspective views of the
to a point adjacent the delivery rollers where
blade and of the blade holder of Figure 7 respec
they are dropped by mechanism not shown, to a
tively;
lower level and their direction of movement re
Figure 11 is a view similar to Figure 3 showing
versed until they again arrive in the vicinity of
another modi?ed form of holder and blade;
the feeding rollers I!) where they are suddenly
Figure 12 is a horizontal section through
projected upwardly into their starting position in
Figure 11;
.
the upper level. This comprises the cycle of travel
vFigures 13 andl/l show- a modified arrange
of each faller bar along a path which has been
ment wherein groups of faller bar needles are
referred to as a ?at oval and this cycle is repeated
spatial arrangement of cutters on the taller bars;
replaced by cutters;
Figures 15, 16 and 17 are perspective views of
embodiments wherein the cutting edges are
formed integral with the means for securing these
continuously for the gilling operation. The faller
bars follow each other in this path in timed rela
tion and in a uniform manner.
_ In their upward projection, the needles [6 are
edges to the faller bars; and
V
Figure 18 is a fragmentary view of a detail on
caused to penetrate the web as shown in Figure 3
so that in their advance toward the delivery
an enlarged scale.
rollers H, the needles comb the short staple
lengths into parallelism.
Figure 1 shows a detail.
In Figures 1 and 2 I show a conventional gilling
apparatus comprising feeding rollers [0 at one
end and'delivery rollers}! at the other end, the
rollers H being positively driven at a higher
peripheral velocity than that of the rollers 10, a
relative velocity of the order of ?ve to one being
a conventional practice.
It has, already been
stated that in that conventional practice a plu
rality of slivers as shown in Figure 1 are fed to
the delivery rollers to form the web W and that
The apparatus thus far described is typical of
, theseries of gill boxes employed for the perform
ance of the successive gilling operations.
The process suggested for the simpli?cation of
the present practice contemplates that the con
tinuous ?laments united to form hanks or slivers
also of continuous length, be fed directly to the
feed rollers iii of a gill box and without any re
duction of that continuous length into short staple
as a result of the guillotining operation performed
upon the hanks the web which isso formed, will
courses.
conventional practice may be of the exemplary
tended length because they have not been sub
In accordance with this simpli?ed process, S in
3, Figure l are the hanks or slivers of extended
be comprised of short staple lengths which in a ~: length and comprised of ?laments also of ex
order of 4"’ to 6". It will now be added that the
two aforementioned sets of rollers are conven
tionally spaced apart a distance of the order for
jected to’ a guillotining operation. This suggested
process contemplates further that these slivers S
be formed into a web and that simultaneous with
example of 12". In this practice the short staple 50 the ‘gilling operation the web so formed be cut
length of which the web length between the two
into short lengths during the process of gilling.
sets of rollers is comprised, will fall into these
It contemplates further that this cutting be per
three categories: One group of these short staple
formed by cutting edges associated with the taller
lengths will be gripped and controlled by feed
bars and my invention is directed to a manner of
55
ing rollers iii; a second group will be gripped
association of cutting edges with the gill bars
and controlled by the delivery rollers l l; and the
whereby this can be e?ected.
remaining short lengths will form a third group
‘In Figure 3 I show a fragment of a faller bar
which are free of both sets of rollers but will be
to illustrate one arrangement whereby a cutting
constrained to .move under the control of factors
edge may be associated therewith in accordance
such as adhesion and the like. Because of the (it) with my invention. This arrangement comprises
eccelerated peripheral velocity of the delivery
a blade holding member 25 and a blade 26 to be
rollers l l the ?rst mentioned group of short staple
detachably held thereby with its cutting edge 21
courses will be advanced at an accelerated speed
in predetermined relation to the pointed ends I‘!
relatively ‘to those of the second mentioned group
of the faller bar needles. This holder is illustrated
and the staple courses which comprise the third 55 as made of sheet material. In Figure 5 it is shown
mentioned group will respond and more or less
as comprised in horizontal cross section of the
casually, to the control of factors such as ad
end wall 25', side walls 252 and the ?anges 253
hesion imposed upon them by the movements of
extending inwardly from these end walls, for the
the‘ other two groups. This action attenuates the. 1 reception of a group of adjacent faller bar needles
Web.
,
The attenuated web is delivered by the rollers
ll into the restricted passageway of trumpet 20
which compacts the web to the thickness of a
sliver.
'
_
'
Positioned between the ‘two sets of rollers I0
within said walls. For reasons that will shortly
appear, it is desirable that the material of which
the holder 25 is made or its construction or both
be such that the parts of which it is comprised
yieldlto some extent. The holder is illustrated as‘
2,406,641
open at its top and bottom‘so that it can be passed
over a group of needles, the spacing of the walls
and ?anges of, the holder being such with relation
tothe thickness and spacing and tapered forma
tion of theneedles that as the holder is forced .
down over this selectedgroup of needles, a grad
uallyincreasing frictional engagementi'will be '
‘effected until the'holder reaches its ?nal position
of‘ Figures 3 and 4 wherein it seats upon the top
web by the feed rollers “for the distancefrom
a to cm Figure 6. The effect of this'is that the
' ‘?laments composed in the web width marked “1”
across the top in Figure 6 will be cut into short
staple lengths which correspond‘to'the distance
from a to 0 except that the ?rst cut will be made
> in the narrow width at the extreme left in Figure
6 and the succeeding cut will be made in that
width in the next cycle; the adjacent width which
of the bar 15. This arrangement serves to‘ locate 10 is numbered “2” at the top will be cut at the line
.theholder 25 on the needle bar [5.
. .
numbered 14 in the column of numbers at the left
The blade 26 is illustrated in Figure 3 as gen-v
of Figure 6 and again in that width during fol
erally' rectangular and bevelledrat its upper edge
. lowing cycles and atthe corresponding line. As
to provide the cutting edge 21 which is preferably
a result of all this, the ?laments of which the
inclined as will be pointed out hereinafter. Its
web is comprised are cut into short staple courses
. dimensions are such that its side edges 26’. and
262 can be receivedbetween side walls ‘1252 of the
holder with its cutting edge 21 exposed above the
' of a length between two succeeding cuts in any
one of the aforementioned narrow widths. The
pattern of Figure 6 assumes that all parts of the
top of holder 25 when the blade is - in its
web are moving at a uniform speed which has
?nal position of Figures 3,,and 4'. The blade is 20 been already explained is not the fact. The pat
inserted in the holder by being forced down in
tern however does correctly represent the cutting
between end wall 25' thereof and the needles l6
operation because that is performed upon‘ the
which are received therewithin; The. objectives
web atfa point adjacent the feeding rolls and
which I desire to attain are these: that the grip
where all the ?laments of which the web is com
of‘ theholder 25 about the needles be sufficient
prised are under control of the feed rollers and
to secure the holder thereto and thatthe in
are fed at the peripheral velocity of those rollers.
serted blade increase this grip to a point where
Upon an analysis of the pattern of Figure 6 it
accidental release of either the holder 25 or the
blade 26 will be reduced to a minimum. It will be
pointed out that in this arrangement, the blade
acts as a vlocking wedge to increase the secure
ment, of both blade and holder. This arrange
ment permits of a replacement of the blade with
out'replacing the holder 25. The blade can be
removed merely by forcing it upwardly out of
the holder. To facilitate this, I show an opening
28 in holder 25 (see FiguresB and 4) and a regis
trating opening 29 in the blade to admit a tool
point to facilitate removal of either or both.
7
A feature of my invention is the limited length
of the cutting. edges relatively to the width of
the web and the manner of their arrangement,
whereby the’ ?lamentsof which the web is com
prised, may nevertheless becut into short staple
lengths for the full'width of the webvwithout
howeverbreaking the continuity of the web. In
Figure 6 0f the ‘drawings I show one arrange
ment whereby this may be e?ected. The distance
from a to b represents the width of the web
which is being fed in the direction of arrow X
andthe distance from a to 0 represents that
Will be understood that any speci?c faller bar
such as that numbered 1 in the column at the left
will not comb the width which it cuts but that
inch width will be combed by all the other faller
ars.
In addition to the other bene?ts that result by
way of simpli?cation of the process, the manner '
and time in which the cutting is performed pre
sents these additional advantages. The ?laments
before being out are maintained more or less in
parallelism by the fact that they are of extended
length. Therefore when these ?laments are out
into short staple courses they will generally al
ready be in a position of parallelism and ‘the
movement of the whole mass which comprises
the Web will tend to maintain that relation. ~ This
is particularly so because in' accordance with the
staggered arrangement of the‘patterns such as
shown in Figure 6, none of the short staple courses
in any of the widths numbered at the top' will
have their ends in registration with those in any
other width. It will be understood that the prac
tical application of my invention may be effected
by patterns which vary from that shown in Fig
ure 6 andthat this pattern is merely an exem
length of the web which is in opposition to the
plary one.
‘
active faller bars at any moment and the hori
zontal lines numbered successively #1 to #16
For these reasons'it is believed that the comb
may be stated to be a diagrammatic representa 55 ing operation will be a vsimpli?ed and more effec
tion of the faller bars and the shorter heavier
portion of each line to represent the cutting edge
~ vUpon viewing Figure 4 it will be observed that
the holder ‘25 is so positioned on the needles with
associated with each fallerbar.‘ It will be ob.
served that the cutting edges 21 areshown in this
reference to the direction of movement of the
web that‘during» the upward movement of the
pattern as distributed one to each faller bar and
faller bar the pressure of the advancing web will
as positioned differently laterally on the respec
tend to hold the blade against the needles and
tivebars to give the staggered pattern of Figure 6
tive
one.
~
‘
_
'
thereby assist in rigidifyingv the cutting edge
and that the projection of all the cutting edges
thereof so that a clean- and sharp out ‘will be
of the pattern of Figure 6 on a'single line gives
65 effected.
‘
the resultant ‘of-a cut for the fullwidth of the
web without substantialoverlap;
V
V
. '
' In Figures 7 to 10 inclusive I show a modi?ed
arrangement wherein the holder 30 is shown in
Figure 10 and the blade 3| shown in Figure 9.
which is repeated continuously as the web is fed
The holder of Figure 10 resembles the holder of
through the gill box. As a result each cut is
effected in the particular example of Figure 6 70 the embodimentof Figure 3 in that it is made
vof any preferred or desired material such as
through T16 of the width of the web and. in that
metal and is comprised of a wall 30'- for the full
narrow width is repeated once' for each ‘cycle
Width of the holder, opposed end walls 302 and
_ The pattern of Figure 6 shows a complete cycle
at a, distance from the previous cut in that ‘nar-_
inwardly directed ?anges 33' to receive there
row width that corresponds to'the feed of the 75 between a group ofneedles. The holder com;
2,406,641
prises however in addition, ?ange 32 directed as
shown and provided with. openings 233 one for
each of the needles to be ‘engaged and spaced
correspondingly so that the openings 33 can en—
gage over a group of needles as shown .in Figures
'7 and 8 to lock the holder inposition on a faller
8
means form a' single integral unit. In’this re‘
spect it resembles the embodiments of Figures 15,
16 and ‘17 which I will now proceed to describe.
Referring to Figure 15 I show a blade 60 pro
vided'with a cutting edge BI at its top edge and
having spaced horizontal flanges 62 cut therefrom
and vertical openings 53 formed in said ?anges.
bar. On the opposite face of the wall 31)" is a
The
aforementioned parts and features are all
projection 34 having an inclined surface 36’ to
contrived so that the openings 63 can receive
serve the purpose shortly to be pointed out. The
blade ‘is rectangular like inthe embodiment of 10 spaced apart needles therethrough to frictionally
Figure 3 but however is slitted adjacent. to each , secure the blade 68 in predetermined position.
The securing means of Figure 15 bears a re
side edge from thebottornupwardly as shown at
semblance to the securing means of the holder
38 to provide the fingers ‘39. It is provided also
of Figure 10.
'
with the opening 36, all for reasons that will
The embodiment of Figure 16 resembles the
shortly appear. In this case the holder 30 is 15
embodiment of Figure 3 in that the securing
assembled with a group of needles merely by pass
means comprises the end wall 70, side walls 10'
ing the group through the openings 33 until the
and. inwardly directed ?anges 762. It differs
member .32 seats on top of the faller bar. The
from the aforementioned embodiment'in that the
blade is then inserted within the space provided
by the walls 38", 362 and ?anges 33’ until the 20 end wall 'Hlhas been bevelled at its topiedge to
provide the cutting edge.
I
lower edge of the opening 36 passes over the pro
In the embodiment of Figure 17 the cutter is
tuberance 3d and locks therebelow. The width
shown at 80 and .is bevelled at its upper edge to
of the ?ngers 39 are at least equal to and possibly
provide a cutting edge. Outwardly from its
greater than the width of the ?anges 33’ so that
lower edge extends the horizontal ?ange 81 with
thereby the lower part of the blade intermediate
openings 82 therethrough to receive a group of
the ?ngers is permitted freely to ?ex over the
abutment 34 to its locked position of Figures '7
Reference has been made to ‘the fact that the
and 8. In this modi?cation the securement of
cutting edge shown in each of the embodiments
the holder to the faller bar is effected primarily
is preferably inclined but the cutting edges are
through the member 32 and the openings 33 and
not so shown in each of the ?gures already de
only incidentally to any frictional engagement
scribed because it is deemed more convenient to
eifected by the other parts. What has otherwise
do this in the enlarged showing of Figure 18
been said of the embodiment of Figures 3 and 4.
wherein the cutting edge’ 38 is shown inclined
applies also to this embodiment.
so that the end BI is higher than the end 82.
The embodiment of Figures 11 and 12 di?ers
This facilitates the cutting operation for reasons
from the embodiment of Figure 3 in this respect:
that will be readily understood.
the holder 45 has its side walls 452 slotted at their
Notwithstanding that a natural ?ber such as
bottom and the blade 46 has ?anges 41 extending
cotton is of relatively short length of the order
outwardly from the bottom of its opposed side
as low as one half an inch, many featuresof
edges. Otherwise the holder of Figures 11 and
my invention nevertheless have a practical ap
12 is similar to the assembly of Figure 3 except
plication in the production of yarn therefrom.
that in the embodiment of Figures 11 and 12 the
It is contemplated that such practical applica
blade is ?rst assembled with the holder by being
tions be encompassed herein unless otherwise
passed upwardly through the bottom thereof so
that the ?anges 41 of the blade engage in the 45 expressly statedin the claims.
Itwill be understood that I have disclosed in
slots of the holder and the two when thus assem
Figure 6 only one pattern which assumes a single
bled are then passed'over a'group of needles to
blade on each faller bar. It will be understood
effect the same character of frictional engage
that with such specific arrangement the staple
ment thereof 'as is effected in the embodiment of
‘Figure 5 wherein the blade acts as a wedge to 50 lengths into which the ?laments are cut will be
dependent upon the time interval in the com
that end. The ?anges 41 act positively to prevent
pletion of a cycle and the rate at which the web
the blade from moving out of the holder.
is fed, and that a change in this relativerela
It has already been pointed out that the se
tion will result in a change of the length of these
lected group of needles of any particular faller
bar vwhich are in opposition to the cutting edge 55 short staple lengths.
,
g ‘It willalso be understood that the staple length
carried thereby do not comb the particular width
canl be controlled by associating a multiplicity of
cut by said cutting edge. I therefore show in
cutting edges with each faller bar in'which event
Figures 13 and 14 another embodiment of the
a plurality of cuts will be made by each faller
invention in which this selected group of needles
are removed entirely and a cutting edge posi 60 bar during each cycle. It will further be under
stood that the pattern disclosed in Figure 6
tioned in the space left thereby and secured in
could be usedfor attaining the general objects
that position by engagement with the solid por
of my invention.
’
tion of the faller bar.
Having thus described my invention and illus
By reference to Figure 14 it will be observed
that I show a cutter 50 bevelled at 5| to provide 65 trated its-use, whatI claim as new and desire
the cutting edge. Extending inwardly from its
to secure by Letters Patent, is:
.
lower edge is the ?ange 52 from which depend
1. A separable attachment to a gill box faller
bar comprised conventionally of a base and
the pins 53. These pins are of a thickness so as
to be received in the openings 54 provided in the
needles for detachably securing a blade to such
faller bar for the reception of the needles which 70 faller bar with its cutting edge in predetermined
relation to its needles, said attachment being
have been removed. The ?t of the pins 53 and
the openings 54 is preferably a tight one for
made of a sheet material and comprising a wall
needles.
obvious reasons.
This embodiment diners from
7
'
of'a width sufficient to span. a group of adjacent
needles and of a height less than thelength of
the previously described embodiments in the re;
spect that the cutting ‘edge and the securing 75 the needles and ?anges‘ bent from the opposite
' r 2,406,641
‘side edges of said wall to extend inwardly to
ward each other and parallel with and normally '
10
needles projecting through and beyond the open
top of said attachment so that a ?at blade can
spaced from said Wall-for approximately the di
'
be
entered between said wall and the group of
ameter of the needles, saidwall and ?anges de
?ning an expansible unobstructed channel of 5 » needles engaged there-by and frictionally held
therebetween with its cutting edge located above
uniform cross-section and entirely open at the
the top of the attachment ‘and below the pointed
top and bottom, whereby the attachment can
be engaged over a group of needles through its a
ends of the needles.
7
'
3. A separable attachment to a gill box faller
open bottom with the group of needles encom
passed by the wall, and ?anges, with the pointed 10 bar comprised conventionally of a base and
needles for detachably securing a blade to such
ends‘ of the needles projecting through and be
faller bar with its cutting edge in predetermined
yond the open top of said attachment so that a
relation to its needles, said attachment being
flat blade can be entered betweenI said wall and
made-of a sheet material and comprising a wall
‘the group of needles‘ engaged thereby and fric
of a width su?icient to span‘ a group of adjacent
tionally held therebetween with its cutting edge
needles and of a height less than the length of
located above the top of the attachment and 7
the needles and ?anges bent from the opposite
below the pointed, end of the needles.
side edges of said wall to extend inwardly toward '
2. In combination a gill box faller bar com
each other and parallel with and spaced from
prised of the conventional base and needles, and
said wall, said wall and ?anges de?ning an ex
a detachable attachment for securing a blade to
pansible unobstructed channel of uniform cross
such faller bar with its cutting edge in prede
' section and entirely open at the top and bottom,
termined relation to its needles, said attachment
whereby the attachment can be engaged over a
being made of a sheet material and comprising
group of needles through its open bottom with the
a wall of a width su?icient to span a group of
group of needles encompassed by the wall and
adjacent needles and of a height less than) the
?anges, with the pointed ends of the needles
length'of the needles and ?anges bent from the
projecting through and beyond the open top
opposite side edges of said wall to extend in;
wardly toward each other and parallel with and _
normally spaced from said Wall for approximately
the diameter of the needles,
7
said wall and
?anges,
of said attachment so that a ?at blade can be
entered between said wall and the group of
needles engaged thereby and frictionally held
therebetween with its cutting vedge located above
de?ning an expansible unobstructed channel of
the top ofthe attachment and below the pointed
uniform cross-section and entirely open at the
top and bottom, the attachment being engaged ‘7 ' end of the needles and means on the holder for
interengaging with an inserted blade for looking
over a group of needles through its openbottom
it against vertical movement relative to the
with the group of needles encompassed by the
Wall and ?anges, with the pointed endsvof the.
holder.
‘ ALBERT J. SIGNORET.
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