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Патент USA US3059294

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Oct. 23, 1962
Filed Jan. 18, 1960
3 Sheets-Sheet 1
47 I: Z//:_,__
Oct. 23, 1962
Filed_Jan. 18, 1960
3 Sheets-Sheet 2
Oct. 23, 1962
Filed Jan. 18, 1960
3 Sheets-Sheet 3 .
United States Patent 01 [ice
Patented Oct. 23, 1,962
ments thereof when read in connection with the accom
panying drawing, in which:
Werner Naegeli, Winterthur, Switzerland, assignor to
(Cl. 19—263)
'rangement shown in FIG. 1.
FIG. 3 is a perspective view of an analogous cleaning
or stripping device.
The present invention relates to a‘ stripping device for
clearer rollers in drafting arrangements of spinning ma
FIG. 2 is a ‘cross sectional view .of'the drafting ar
the arrangement in open position.
Actiengesellschaft Joh. Jacob Rieter & Cie.,‘ Winter
thur, Switzerland, a corporation of Switzerland
Filed Jan. 18, 1960, Ser. No. 3,191
Claims priority, application Switzerland Jan. 23, 1959
3 Claims.
FIG. 1 is a perspective view of a' drafting arrange
ment with the lid forming part of the shell or casing of
‘ FIG. 4 is a perspective view of a further modi?cation
of the apparatus according to the invention.
‘FIG. 5 is a cross sectional View of the .device shown
in FIG. 4.
In conventional drafting arrangements in which the
Referring more particularly to the drawing, numeral
top or drawing rollers are cleaned by means of clearer 15 4 designates a slightly conical clearer roller which rests
on top rolls 1 and 2 of a draftingrarrangement within a‘
rollers whose surfaces are adapted to accumulate ‘?bres,
the clearer rollers must be periodically taken off for re
casing '3 whose lid is open. The clearer roller 4 is pro
moval ‘of ?brous material accumulated thereon. Draft
vided with a covering made of plush, woolen cloth, or‘
ing arrangements which ‘are provided with slowly mov
foam rubber in the conventional manner for receiving
ing cleaning ‘cloths or with stationary or reciprocating 20 ?bres and other impurities adhering to the top rolls ,1
clearer plates which are provided with a covering capa
and 2. Axial movement of the clearer roller is limited
by a shaft 5 extending from the small diameter end of
ble of accumulating ?brous material must also be cleaned
the clearer roller and abutting against a stationary part 6
from time to time by the operators.
of the drafting arrangement. The latter is provided
‘It is an object of the present invention to provide a
fully automatic cleaning or stripping device for drafting 25 with means, not shown, producing ‘an air current within
the casing 3 which current is directed substantially paral:
arrangements which are provided with ?y suction ar
lel to the top rolls and carries away ?y developing inside
rangements as disclosed, for example, in my copending
the casing 3. A suitable arrangement is shown in my
application Serial No. 752,462, ?led August 1, 1958.
copending application Serial No. 752,462, ?led August
The device according to the invention includes a comb
provided with pointed teeth or needles whose points are 30 1, 1958. By selecting’ a conicity of the clearer roller
suitable for the prevailing friction between the top rolls,
placed adjacent to the periphery of a clearer roller ‘which
rests on one or more top rolls and which has a surface
and the clearer roller, the direction of the axial move
capable of accumulating ?brous material and moving at
ment of the ‘latter can be so controlled that shaft 5
a velocity which is different from the circumferential
extends from the clearer roller- in a direction which is
speed of the top roll or top rolls on which the clearer 35 opposite to the direction of the air current which is indi
roller rests. When the layer of ?bres accumulated onv
cated by arrows in FIG. 1. With this arrangement, a
free passage is provided for the ?y which is picked oli
the surface of the clearer roller has obtained a predeter
mined thickness, individual r?bres or bunches thereof’
are picked from the top of the layer by the points of the
needles or teeth of the comb and are thrown into the 40
space within the casing of the drafting arrangement from
the surface of the clearer roller by the device which will
be described below.
A clamp 8 is mounted on each of the roller supports
7 of the drafting arrangement for clamping a rod 9 to the
stationary supports v7. The center portion of theprod 9
is provided with an axial slot 10 which is slightly longer
than the clearer roller 4 and receives a comb plate 11.
The invention relates also to the structure of the comb 45 The latter is ?xed on the rod 9 in a desired position by
and its position relative to the‘ clearer roller. It has
means of bolts 12 extending through apertures 13 which
been found that the angle at which the comb is set rela
are normal to the longitudinal axis of the rod 9‘ and oblong
tive to the surface of the clearer roller depends on the
to have a longitudinal axis parallel to the rod 9. Needles
number of teeth per unit of length of the comb, on the
14, spaced approximately 2 to 5 mm., are mounted on the
direction and velocity of the air current, on the type of 50 lower edge of the comb plate 11 similarly as is done‘in
the ?bre accumulating covering of the ‘clearer roller and
comb strips of combing machines or gill boxes.
> i -'
on the type of the spinning material.
' It is important that the needles 14 are placed at a
which they are sucked away by a current of air so that
they will not settle down on other parts of the drafting
In the stripping arrangement ‘according to theinven
suitable angle 0: with respect to the tangential plane t (FIG.
tion, the teeth of the comb are set at an angle a between
80° and 110° with respect to a tangential plane on the 55 2) on the surface of the clearer roller 4 at the line of inter
section of the plane in which the needles are located with
line of intersection of the surface of the clearer roller
surface of the clearer roller, the angle a being on the
and the plane of the comb, the angle being measured on
side of the comb towards which the surface of the clearer
the side of the comb onto which runs the surface of the
roller moves when the drafting arrangement is in normal
rotating clearer roller. The teeth are inclined longitu
dinally of the comb at an angle between 60° and 90° 60 operation. For de?ning an optimal angle or, the type of
spinning material, the type of needles, the direction and
with respect to the aforedescribed line. With this posi
velocity of the suction air current, and the type of covering
tion of the teeth of the comb, the ?bre material is easily
of the clearer roller must be considered. In the example
stripped from the clearer roller and the material which
illustrated in FIG. 2, the angle a is 80° ‘which is about the
may adhere to the points of the teeth is e?iciently blown
away by an air current ?owing alongside and in axial 65 lower limit of this angle.
The rod 9 which is mounted on the supports 7 is pro
direction of the clearer roller.
vided with a protuberance 15 (FIG. 2) ?tting into a com
The novel features which are considered characteristic
plementary recess 16 in the slightly resilient clamp 8. In
of the invention are set forth with particularity in the
appended claims. The invention itself, however, and 70 this way, bending of the needles or of the comb plate, if
the latter is forcibly rotated, is prevented because in
additional ‘objects and advantages thereof will best be
that case, the resilient end of the clamp 8 is lifted by the
understood from the following description of embodi
protuberance 15 so that the rod 9 together with the comb
plate 11 is removed from the clearer roller.
The comb plate 17 shown in FIG. 3 is provided with
teeth 18 which are produced by suitably machining one
marginal portion of the comb plate. The needles or points
18 are slanted to the left. This is of advantage, if the
?y-removing air current is directed from right to left in
axial direction of the clearer roller, as indicated by ar
In the embodiment shown in FIG. 5, the angle on formed
by the needles 18 and the tangent t is 110°, in contradis
tinction to the angle shown in FIG. 2 which is 80". As
explained before, the angle a must be chosen according to
the number of comb teeth per unit of length of the comb,
to the direction and velocity of the suction air current, to
the material of the covering of the clearer roller, and to the
rows in FIG. 3. In this way, ?bres adhering to the
points 18 are easily blown away by the air current. The
angle ,6 at which the center lines m of the points or teeth
18 are inclined with respect to the line L in which the
spinning material. The aforedescribed angle [3 also has
some in?uence on the angle 0:. Tests have shown that,
generally, an angle a between 80° and 110° produces sat
isfactory results.
roller 19 rests on two top rolls 1 and 2 which rotate at
The operation of the aforedescribed devices is as
The ?brous material accumulating on the rotating
clearer rollers 4, 19, 25 is seized by the points of the
comb teeth when the layer of ?brous material accumu
different speeds so that the circumferential speed of the
surface of the clearer roller is between the circumferential
is picked off, i.e., removed ‘from this layer so that the ?bres
surface of the clearer roller is intersected by the plane
in which the needles are located, is preferably 60” to 90°.
In the embodiments shown in FIGS. 1 to 3, the clearer
lated on the clearer roller reaches a certain diameter and
speeds of the top rolls 1 and 2. In this way, a relative
move into the space between the clearer roller and the
sliding of the top rolls 1 and 2 and the clearer roller is 20 casing 3. An air current passing inside the casing to the
obtained which is essential for producing the desired
right in FIG. 1 and to the left in FIGS. 3 and 4 and pro
wiping effect. Axial movement of the clearer roller 19
duced by a suction apparatus, not shown, carries the ?bres
in FIG. 3 is prevented by a strap 20 which is swingably
picked off and liberated by the comb strip. The device
supported on the rod 9 between the comb plate 17 and a
according to the invention assures that the thickness of
setting ring 21. The free end of the strap 20 rests between 25 the layer of ?brous material accumulated on the clearer
two rings 23 and 24 mounted on a shaft 22 extending
roller never exceeds the measure which is de?ned by the
from the right end of the clearer roller. There- is enough
clearance provided between the rings 23, 24 and the strap
distance between the needle points and the periphery of
the clearer roller. No additional ?bres can be accumu
lated on the clearer roller and no removal of the roller
20 so that the clearer roller can freely rotate. A slight
freedom of axial movement of the clearer roller is prefer 30 and periodic cleaning by the operator are required.
ably provided. The strap 20 is preferably made of a low
I claim:
friction synthetic material which has a high resistance to
1. In a drafting arrangement for spinning machines
abrasion, for example Nylon 66, or of metal having like
having a plurality of top rolls, support means for said
qualities, particularly if grounding of electrostatic charges
rolls, and a clearer roller having a surface capable of
35 accumulating ?bres and resting on at least one of said top
is desired.
If, as shown in FIGS. 4 and 5, the clearer roller 25
rolls; means for conducting an air current adjacent to
rests only on one top roll 1, special means must be provided
the clearer roller, and a comb having pointed teeth in the
for reducing the difference between the circumferential
speeds of the top roll and of the clearer roller which is
essential for producing the desired Wiping effect. A sup
port 26 is mounted on each of the clamps 8, the. supports
26 having surfaces frictionally engaging shafts 27 and 28
extending from the ends of the clearer roller 25. Gravity
causes frictional engagement between these shafts and the
supports 26 so that a braking effect on the clearer roller
is produced. If desired, the active diameter of the shaft
extensions 27 and 28 may be increased by mounting rings
immediate vicinity of and not engaging said surface for
removing ?bres accumulated on said surface and divert
ing the ?bres into said air current.
2. In a drafting arrangement as de?ned in claim 1 and
wherein said comb is placed at an angle between 80° and
110° relative to a tangential plane on said clearer roller
at the intersection of the plane of said comb and said
3. In a drafting arrangement as de?ned in claim 1 and
wherein the air is conducted in axial direction alongside
29 on the shaft extensions 27 and 28 as shown in FIG. 5.
the clearer roller and said comb is plane, said teeth being
By suitably selecting the diameter of the rings 29, the
slanted in the direction of the air current at an angle be
tween 60° and 90° along the plane of said comb.
brake moment and the dilference between the circumfer
ential speeds of the top roll 1 and of the clearer roller
can be made to fit the general conditions of the drafting
References Cited in the ?le of this patent
and cleaning arrangement. The position of the surface
portion of the supports 26 which is in contact with the
shaft extensions of the clearer roller 25 is important be
cause it de?nes the component of the gravity force which
produces friction.
Schultze _____________ __ May 30, 1933
Batchelder ____________ __ July 4, 1939
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