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Патент USA US3095728

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July 2, 1963
G. T. SMITH
3,095,718
WEAR-RESISTANT THROAT PLATE FOR KNITTING MACHINE
Filed Sept. '7, 1960
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INVENTOR
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United States
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3,095,718
Patented July 2, 1963
1
2
3,095,718
40G-Needle 2-Speed circular machine sold by the Fidelity
WEAR-RESÍSTANT THROAT PLATE FOR
KNITTING MACHINE
Gus T. Smith, Paducah, Ky., assîgnor to Ace
Engineering Company, Paducah, Ky.
. Filed sept. 7, 1960, ser. No. 54,418
` Machine Co. The throat plate of this particular machine
includes an elongated oval aperture disposed in closely
spaced relationship to the iront edge of the plate and ex
tending generally transversely to the direction of Inove
6 Claims. (Cl. 66--125)
rnent of the yarns through the plate. The presence of
this aperture «at this particular location introduces rather
This invention relates to a yarn guiding element ,for
use on knitting machines or the like and is concerned
unusual problems in modifying the design of the ear-lier
more particularly with a wear-resistant thi-oat plate for
association with such machines, especially circular ma
chines of the type sold by Fidelity Machine Co.
application.
The principal object of the present invention is the
provision for a circular knitting machine of a throat
plate including a wear-resistant ceramic insert constitut
higher land higher speeds has aggravated the problem of
ing the forward yarn-contacting edge of the plate, with
the insert joined to the plate by tongue-and-groove con
nection, preferably at each of »its ends, which plate can
be employed in lieu of the plate described in the above
reducing the wear of surfaces with which these yarns come
identified application.
The increasing use in the textile art of synthetic yarns,
for example, nylon and Daeron, especially those of lower
denier, and the trend towards handling such yarns at
in contact in the various textile machines by which they
are processed and has given impetus to the development
:A :further object of the invention is a throat plate hav
ing a wear-resistant ceramic insert united to the body of
of wear-resistant elements for use at those points of the 20 the plate by a tongue-and-groove Iconnection as just de
machines Where Wear is unusually acute. Thus, ceramic
scribed in which said connection is rein-forced by a pin
inserts have been 'developed for a variety of the more
passing through the insert and a portion of the plate body
conventional devices by which yarn is guided and/or
to prevent the insert from becoming dislodged during use.
.An additional object of the invention is a throat plate
handled, such as thread guides employing eyelets, tubes,
rollers, pig-tails, condensors, and the like. The tech
niques »and expedients utilized in applying inserts to such
conventional guards, however, are of little assistance in
»devising a similar solution to the problem of yarn wear
on the throat plates of circular knitting machines. As
is Well known, the plate bridges the throat of the latch n
ring of the machine and delivers the yarn from the yarn
fingers to the needle cylinder. This plate is generally
of channeled configuration in the direction of travel of
the yarn, which, dur-ing the operation of the m-achine,
traverses the width of the channel and leaves its front
edge in a generally downward direction. The combina
tion of the back and .forth movement of the yarn and
the angle with which it leaves the plate subjects the front
edge of the plate to extreme wear, especially fat its side
corners. This wear necessitates `frequent replacement of
the plate and, moreover, limposes an abnormally high
iiuctuati-ng tension on the yarn.
‘From what has just been said, it will be appreciated
that the coniigurationof the conventional plate is dis
tinctly diiîerent from that of the usual type of yarn guide
and this has hampered the `adaptation of wear-resistant
ceramic inserts for throat plates. In addition, »as the
machine operates, the throat plate is subjected to an un
las in the preceding object `wherein the reinforcing pins
terminate ñush with one face of the plate, which »face in
the normal operative position of the plate Iabuts a sur
-rface of the knitting machine whereby the pins can be
displaced only when the plate is detached from the
machine.
A further object of the invention is a throat plate, hav
ing a wear-resistant ceramic insert, which is :adapted for
use with knitting machines of the type sold by the »Fidelity
Machine Co.
These and other objects and advantages will be ap
parent from the following detailed description when read
in conjunction with the accompanying drawing, in which:
FIG. 1 is 'a-view in top plan of a throat plate modified
in accordance with the present invention in which the
plate Iand ceramic insert are shown in a position just
preparatory to assembly;
FIG. 2 is a view similar to FIG. 1 but with the plate
and insert assembled;
FIG. 3 is a bottom plan view of the assembly of
FIG. 2;
FIG. 4 is a cross-sectional View taken substantially
along the line 4-4 of FIG. 2;
Y `
FIG. 5 is a cross-sectional view taken substantially
usually high level of vibration which precludes the use 50 along line 5-~5 of FIG. 2;
of :adhesive as the sole means of retaining a ceramic in
sert in place upon the plate.
FIG. `6 is an exploded view in perspective of the throat
plate of the invention;
FIG. 7 is a View in side elevation of the modiiied throat
As a solution to these problems, there was developed
plate of the invention in actual yWorking position on the
»a novel form of throat plate as disclosed in application
Serial No. 818,149 for “Yarn Guide Element” tiled 55 latch ring of the knitting machine, the other elements of
June 4, 1959, commonly assigned with the present ap
the machine being omitted.
Turning now to a description of the invention with
plication, now U.S. Patent 3,004,733, wherein an `in
reference to the drawings, the numeral 10 generally indi
sert of wear-resistant ceramic material was disposed
cates the portion of the conventional throat plate 'which
within a tapered recess at the forward edge of the throat
plate land was provided with lateral extensions or wings 60 is retained for purposes of the invention, which portion
overlapping the front margins of the plate and restrain
ing the insert against downward movement relative to
the plate, a design that has proved quite satisfactory.
The throat plate in this instance, however, was specifi
cally developed for use with the so-called Model KN
circular knitting machine manufactured and sold by Scott
and Williams, Inc. and, while the throat plates of other
like machines can be modiiied >»by the addition of an in
may be referred to for convenience =as the “base mem
ber.” It will be seen that this portion is in the shape of
a relatively thin, rectangular block having parallel top
and bottom faces »12 »and 14, respectively, parallel side
faces 16 and 18, and a rear end face ‘20 disposedat right
angles to the Walls 12u18. Intermediate side walls 16
and ‘18, top Wall 1,2» is cut away to provide a recess, gen
erally design-ated 22, which is deñned by a ñoor wall 24
and upstanding parallel end walls 26 and 28. The sec
quire a sufñciently diiferent type of plate as to make the 70 tions of base member 110l on either side of recess 22 lare
sert in a similar manner, certain other machines re
utilization of the concept of the above identified appli
cation impractical. One such machine is the Fidelity
formed with elongated apertures 30, 32 normally extend
ing perpendicular to faces 12, 14, through which apertures
3,095,718
3
screws 35 may be inserted to attach base member to the
underside of the latch ring `33 (see FIG. 7) of the knit
ting machine. The base member may, of course, be ad
justed relative to the latch ring and needle cylinder with
in the limits of :apertures 3‘3», 32. The portions of bottom
face 14 of the base member marginal to apertures 3€), 32
are counter-sunk as at 34 to receive the heads of the re
taining screws 35.
As is known in the art, base member l() may be formed
of steel or the like although, if desired, other material
may be substituted, such as nylon or nylon reinforced
with a steel supporting plate as is disclosed in the previ
ously-identiiied application.
Customari-ly, the entire throat claim, which has es
sentially the same overall configuration .as the assembly
shown in FIGS. 2-4 is constructed as a unitary article and
there is provided in the lfloor a recess 22, a transverse
in the tongues 42, 4d, and after the two members are
assembled together with the tongues and recesses in mat
ing engagement, a small rigid retaining pin 8l) is inserted
into each of the apertures to lock the tongues in place.
lf desired, apertures 78 may be extended downwardly
into the portion of the insert member underlying the re
cesscs 74, 76 but it is preferred that these apertures do
not pass completely through the insert member. Conse
quently, pins 8d can be inserted and removed only from
the top face of the insert. Since, when the plate is in
operative position on the lmitting machine, the top face
lof the plate on either side of recess 22, 62 abuts against
the underface of the latch ring of the machine, it will be
seen that there is no possibility of retaining pins becom
ing accidentally unseated from their Aapertures while
the machine is in operation.
elongated aperture stopping just short of the side walls
It is desirable in most instances to employ a filler,
preferably of an adhesive nature, between the contacting
26, 28 of the recess. In accordance with the present in
vention, however, the front end portion of the base mem
surfaces of the insert and base members. Such a filler
Serves primarily to insure a proper fit between these sur
ber, except as hereinafter explained, is cut away andre
placed by a correspondingly formed portion of wear~resistant ceramic material, which is referred to herein, for
faces which fit, in the absence of a filler, would be difli
cult and impractical to achieve. Obviously, the filler is
convenience, as “an insert member” and is given the gen
eral designation 40. The plane along which the conven
tional throat plate is foreshortened to define the base
member of the present invention may, of course, vary
somewhat in its location from fron-t to rear of the plate,
not relied upon as the primary means for connecting the
two members together although, wherever it is of an ad
hesive nature, it does offer a further guarantee against the
two members coming apart. As a practical matter, an
adhesive joint cannot be relied upon alone since in time
such a joint will become weakened by oil penetration or
by machine vibration so as to allow the insert member to
but preferably, that plane passes through the major axis
of the aperture in the floor of recess 22 so that the front 30 drop ofi into the knitting cylinder and cause an expen
sive smash-up. In accordance with the present invention,
face 37 of member l@ `includes an inwardly curved por
there is no danger of this occurring; even if the adhesive
tion 38 which defines one-half of that recess.
As is best shown in FIGS. l, 4 and 6, the sections of
liller does become weakened, the two members are posi
the front face 37 on either side of recess 22 `are each pro«
tively held together by the tongue-and-slot retaining pin
vided with a relatively thin fiat tongue, indicated by the
numerals 42, 44, by means of which insert member ¿it?
may be attached to base member 16. Tongues 43, 44
preferably extend parallel to faces l2 and 14 of member
l() at a locus lying approximately midway between these
connection.
It is preferred that the tongues of the tongue-and-slot
connection be carried by the base member since the mate
make a right angle with the plane of front face 37. Each
tongue is provided with 1an aperture ¿i6 having its axis
generally at right 4angles to the top and bottom faces of
vided in the base member.
The insert of the present invention was designed for
rial from which that member is constructed is better able
to withstand the load of supporting the insert member,
faces and have their outer edges lying more or less iiush 40 than is the rather brittle ceramic of the insert member.
As a less desirable alternative, however, the arrangement
with side faces 16 and 1S of the base member and with
of the tongue and slots can be reversed with the former
their inner edges terminating somewhat short of the
being integral with the insert member and the latter pro
limits of recess 22. The axes of the tongues preferably
member 10 for a purpose toe-be hereinafter explained.
As already indicated, insert member 4Q corresponds in
configuration to the portion that is cut away from the
conventional throat plate to leave base member iti. Thus,
the insert member includes top and bottom faces 52, 54,
side faces '56, 58 and a recess 62 bounded by a floor wall
64- and upstanding parallel side walls 66, 68, all of which
Walls and faces lie Hush with the corresponding walls and
faces of base member '10 when the insert member and
base member are `assembled together to constitute an en
tire throat plate. Along its front face 70, the insert mem
specific application to knitting machines available from
the Fidelity Machine Company and details of the plate
have been illustrated accordingly. It does not necessarily
follow, however, that the principles of the invention are
limited to this single application; as a matter of fact, they
will be found useful in connection with various other
throat «plates or, for that matter, with any yarn guide
wherein a strong, positive connection between a wear
resistant insert and a base member is a desirable feature.
While ceramic materials suitable for the construction
of Iwear-resistant insert of the present invention are sutii
ciently well known in the art that a detailed description
thereof is hardly necessary, duplication of the invention
may `'be facilitated by the knowledge that this type of ma
To complete the center aperture defined in part by the 60 terial is described in U.S. Patents 2,2l4,703 and 2,369,666
to Thurnauer. In general, ceramics having properties
inwardly curved portion 38 when the two members are
satisfactory to the `manufacture of the inserts according to
fitted together, the rear face .of insert member di@ is formed
this invention may be identiñed by the following charac
with a correspondingly shaped central portion 72, the
teristics:
portions 3S, 72 together constituting an elongated more
ber is smoothly curved in a manner similar to the con
ventional throat plate for reasons well known in the art.
or less oval recess, as is readily apparent in FiG. 2.
Obviously, insert 70 must be adapted to effect mating
engagement with tongues 42, 44 when assembled with
65 Hardness, Mobs’ scale ________ __ 8-9.
Resistance to impact,
Charpy,
pounds per square inch _____ __ 2.4-6.3.
base member l1t) and, to this end, the rear or inner face
Flexional strength, pounds per
of the insert is formed at its lateral extremities with cor
square inch ________________ __
responding recesses 74, 76 so configured `as to receive 70 Compressive strength, pounds per
tongues 42, 44. To avoid any possibility of the insert
member becoming ydislodged from the base member after
assembly, the portion of the insert member overlying
each of the recesses 74, 76 is penetrated by an aperture
7S in axial alignment with the corresponding aperture 46
20,000-40,000.
square inch ________________ __ 80,000-l00,000.
Density, pounds Iper cubic inch____ .O95-.123.
Water absorption _____________ __ Nil.
Resistance to heat ____________ __ 1,09()o C.-l,1()0° C.
Thermal
conductivity _________ __ .01E-.02.
5
6
Speciñc ceramics meeting this definition can ‘be obtained
from the American Lava Corporation under the trade
5. A yarn guide as in claim 3 wherein the plane of the
abutting faces extends at a right angle to the axis of said
name ALSIMAG.
recesses.
Some examples of the variations and modifications
within the scope of the present invention have already
been mentioned and those «skilled in the art can appreciate
that others can be made without rdeparting from the spirit
of the invention. Consequently, the scope of the inven
tion should be `interpreted in the light of the appended
6. A throat plate adapted for attachment to the under
surface of the latch ring of a knitting machine, said plate
comprising a base member to «be attached to said ring
undersurface, said member having a surface thereof abut
ting said undersurface when attached and an end face
extending generally at right angles to said surface, an
insert member of wear-'resistant ceramic material having
' claims rather than the embodiment specifically illustrated
and described.
an end face adapted to mate with the base member end
Having ythus described my invention, what is claimed
face and disposed in abutting relationship therewith, one
of said members having at least one tongue projecting
1. A wear-resistant yarn guide comprising a base mem
from its end face and the lother of said members having
ber and an insert member formed of wear-resistant 15 a reces-s ‘for each such tongue formed in its end face,
1s:
ceramic materials arranged in abutting relation, at least
aligned communicating apertures formed in each such
tongue and the adjacent portion of said other- member
one tongue projecting from one ‘of said members, a recess
formed in the other of said members for each such tongue
and adapted to receive the same, aligned apertures formed
in the tongue and in an adjacent portion of said other
member, the latter aperture having an opening in only
at an angle to the aforementioned base member surface,
each aperture in said other member having an opening
one face of the member, the axis of said apertures ex
only in said base member surface, and a rigid retaining
pin ‘for each such tongue inserted into said apertures
through said opening, said pin Ipassing at least substan
tending generally transversely of the tongue axis, and a
tially through the corresponding tongue and extending
` rigid retaining pin inserted into said apertures through
into said other member on at least one side of such
said opening, said pin passing at least substantially 25 tongue, whereby the ring undersurface closes said open
through said tongue and extending into said other mem
ing `when the plate is in operating position.
ber on at least one side of the tongue.
2. A yarn guide `as in claim 1 wherein said 'base mem
ber is provided on one face thereof Iwith a recess through
which said yarn passes and said insert member includes
.
.
.
.
on its corresponding face a recess constltutmg an exten
References Cited in the ñle of this patent
UNITED STATES PATENTS
30
916,553
2,436,904
sion of the recess in said base member, said members
Heap ______________ __ Mar. 30, 1909
Shea _________________ __ Mar. 2, 1948
having `faces abutting along a plane extending at an angle
2,896,434
McKinley et al. _______ __ July 28, 1959
to the axis of said recesses.
3. A yarn guide as in claim 2 wherein said one mem
2,967,412
Hoefer ______________ __ Jan. 10, 1961
3,004,733
Spivey ______________ __ Oct. 17, 1961
ber includes a tongue projecting from the abutting face
35
thereof on either side of said recess.
FOREIGN PATENTS
4. A yarn guide as in claim 3 wherein said base mem
ber is the member having said tongues.
451,288
Canada _____________ __ Sept. 21, 1948
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