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Патент USA US3083563

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April 2, 1963
J. DE Moss ETAL
3,083,553
CUTTING ASSEMBLY FOR CIRCULAR KNITTING MACHINES
Filed July 20, 1961
F163.
FIGI.
FIJG. 2.
INVENTORSI
J OHN DeMOSS
ROBERT PE E L
ATTYS.
United States Patent 0
1 r.
1C6 '
3,083,553
Patented Apr. 2, 1933
1
2
3,083,553
ates with a serrated or toothed annular ring 23 mounted
on and for rotation with the dial 12. The upper face
CUTTING ASSEIVIBLY FOR CERCULAR KNITTING
MACHKNES
John De Moss, Somerdale, N1, and Robert Peel, Phiia
deiphia, Pa., assignors to Singer-Fidelity, Inc, Philadel
phia, Pa, a corporation of Delaware
Filed July 20, 1961, Ser. No. 125,585
3 Claims. (Ci. 66—14t3)
This invention relates to cutting devices used on cir
cular knitting machines, particularly ladies ?ne gauge
seamless hose machines, where the ends caused by the
yarn changes are cut short as knitting proceeds.
One type of such device is shown in U.S, Patent 2,824,
of the ring 23 is provided with a ?at surface 2-5 project
ing from the dial, and the teeth 24 of the ring 23 meet
the flat portion 25 of the ring in cutting edges 25. The
cutting assembly 21 cooperates with the cutting edges 26
to sever the yarns engaged by the teeth 24.
As shown in the drawing, the preferred embodiment
of the cutter assembly comprises a cutter element 30 in the
form of a short cylinder with conical indentations 31 on
the two end surfaces thereof. Each of the end surfaces
is lapped or ground to form a ?at annular face 32 hav
ing a sharp edge 34 at the junction with the cylindrical
surface 33. The lower annular face 32 of the cylinder
383. These devices consist of a serrated ring Where the 15 is engaged with the flat surface 25 of the ring 23 with
teeth are in close proximity to the back of the needles
a part of its circumference overlapping the outer periph—
and rotate in synchronization therewith. The teeth are
cry of the surface 25.
on the edge of what can be called a substantially flat ring.
The ?at surface of this ring engages a blade or similar
#Means is provided on the stationary dial cap 13 to ac
curately position the cylinder 30 and bias the annular face
cutter having a cutting edge. In some cases the cutting 20 32 thereof into ?at and intimate contact with the ?at face
edge is raised out of action when not needed and in other
25 of the annular ring 23. In the illustrated embodiment
cases is left in permanent contact with the rotating ?at
of the invention, the positioning means comprises a spring
surface. The teeth of the flat serrated ring cooperate with
?nger 40 mounted on the dial cap 13 as indicated at 41
the cutter or knife edge so that when a thread is en
and having a resilient arm 42 disposed generally circum
trapped in any tooth on the ring it is severed as it passes 25 ferentially of the annular ring 23. The free end of the
arm 42 is provided with a depending toe 43 which ter
the point of engagement with the cutter. In practice this
minates at its lower extremity in a point 44 which engages
combination of mechanism su?ers from certain disadvan
tages associated with wear on both the ring and the knife
in the conical indentation 31 on the upper surface of
the cutter element. The point contact of the leg with
or cutter, failure to cut due to foreign substances raising
the cutter from the surface of the ring and the like. In 30 the cutter element permits the cutter to be self-aligning,
practice, most of the known combinations of mechanism
so as to insure flush engagement between the annular
made in accordance with the above inventions have also
face ‘32 and the upper surface 25 of the serrated ring.
This automatic self-alignment of the cutter with the ser
required considerable skill in the initial setting to insure
that they operate satisfactorily,
rated ring eliminates the necessity for skillful installation
A primary object of the present invention is to obviate 35 and adjustment of the cutter and eliminates the necessity
for the extremely close tolerances which were required in
some of these difficulties and to completely remove the
the prior cutter elements.
necessity for skilled adjustment in the initial setting.
Another object of the present invention is to provide
Because of the overlapping of the cutter with the outer
an improved cutter assembly of simple manufacture which
periphery of the teeth 24 and the point contact between
40 the leg 43 and the indentation 31, the frictional contact
is self-aligning, self-cleaning, and self-sharpening.
More speci?cally, the present invention contemplates a
between the face 32 and the surface 25 during normal
serrated ring substmtially as shown in the above patents,
rotation of the serrated ring 23 causes the cutter to rotate
and a cooperating cutter having a flat annular face with
about the leg point 44. As the cutter rotates, the rotation
a sharp edge and placed on the ?at edge of the serrated
causes the entire annular face 32 of the cutting element
ring with part of its circumference slightly overlapping 45 to pass over the surface 25 and thereby maintains the
the edge of the teeth with means to exert pressure forc
annular face 32 and the edge 34 sharp and free of ridges
ing the annular face into ?at and intimate contact with
the ?at surface of the serrated ring.
All of the objects of the various features and details
of the construction and operation thereof are more fully
set forth hereinafter with reference to the accompanying
or other indentations.
drawing wherein:
FIG. 1 is a fragmentary plan view of the dial ‘of a cir
The rotation of the cutter also
operates to discharge any foreign matter which may lodge
between the cutter and the serrated ring_ In this manner,
the cutter assembly is both self-sharpening and self-clean
mg.
It is apparent that the cutter of the present invention
is of extremely simple manufacture and can be readily
produced in a variety of very hard steels or special alloys,
cular knitting machine embodying a cutting assembly in
55 such as tungsten carbide. Both the upper and lower sur
accordance with the present invention;
FiG. 2 is a side elevational view of the assembly as
seen from the line 2—2 in FIG. 1;
FIG. 3 is a sectional view taken on the line 3--3 of
faces 32 of the cutter may be lapped or ground to create
two cutting edges 34, whereby the cutter may be reversed
if one edge should become damaged or otherwise ine?ec~
tive in use.
FIG. 2; and
FIG. 4 is a perspective view of the cutting assembly. 60 It is preferred to form the cutter element 30 as a cylin
Referring to the drawing, the knitting machine com
der with conical indentations in the upper and lower sur
prises a conventional rotary needle cylinder having a cir
faces, but it is entirely possible to form the element as
cle of needles 11 mounted therein. A dial 12 rotates
a cone, either truncated or pointed at the top. In this
with the needle cylinder and is covered by a stationary
case, the cutter is held doum by a resilient ‘?exible mem
dial cap 13. A latch ring 15 surrounds the needle circle 65 ber having an aperture adapted to receive the upper end
and comprises a part of the stationary frame of the ma
of the cutter. In such a case, the base of the conical
chine. The latch ring mounts one or more feed stations
member would be provided with a suitable indentation
(not shown) which operate in the usual manner to insert
or o?set to provide an annular face similar to the face
yarns into and withdraw yarns out of action,
32. In this way, it is not necessary to provide the ex
In accordance with the invention, a cuttter mechanism 70 treme ?atness which would be otherwise required to in
is provided, preferably one for each feed station, for ex
sure proper cutting action. ample as shown at 21. The cutter assembly 21 cooper
After the cutter assembly has been assembled and put
3,083,553
into operation, it is desirable to retain the cylindrical or
other cutter in position while the assembly is partially
dismantled, for example when lifting the dial cap from
the dial. One method of accomplishing this is by using
a magnetized element for the arm 40.
Thus, when the
4
said cutter element being mounted for self-alignment with
said ?at surface and being rotatable’ by said ring about
the axis of said annular face.
12. Apparatus according to claim 1 wherein said an- '
nular face of the cutting clement projects beyond the
outer periphery of said ?at surface whereby the frictional
serrated ring is removed from engagement with the cutter
engagement of ‘said annular face on the ?at surface of
element, the magnetized arm retains the cutter element
said toothed ring elfects rotation of said cutter element.
while adjustments were made in the knitting machine.
3. Apparatus according to claim 1 wherein said’ cutter
While a particular embodiment of the present inven
tion has been herein illustrated and described, it ‘is not in 10 element is generally cylindrical in form and is provided
with a generally conical indentation on its upper surface
tended to limit the invention to such disclosure, but
coaxial with said annular face, and including a mount—
changes and modi?cations may be made therein and there
ing arm secured to said dial cap and having a point pro
to within the scope of the following claims.
jecting into the conical indentation on said upper surface,
we claim:
.
!1. In a circular knitting machine having a rotary cylin 15 said arm being resiliently ?exible'to thereby bias said
cutter into ?ush engagement with said surface of the
der mounting a circle of needles, a toothed ring mounted
for rotation with said cylinder adjacent to and within
said needle circle, said toothed ring having an upper flat
surface cooperable with said teeth to form a plurality of
cutting edges, and a stationary dial cap superimposed on
said ring; a cutter for 'yarn engaged in the teeth of said
ring comprising a cutterelement having an annular face
toothed ring, the point and said indentation cooperating
to provide for self-alignment of said cutter.
References Cited in the ?le of this patent
UNITED STATES vPATENTS
2,592,019
engaged ?ush against the ?at surface 'of said toothed ring,
2,824,436
said annular face cooperating with said cutting edges to
sever the yarn engaged in the teeth of said toothed ring, 25 2,970,460
Farnett __________ __v____ Apr. 8, 1952
Stack et a1 . _ _ _ _; _____ __ Feb. 25, '1958
Mahler et al. ________ __ Feb. 7, 1961
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