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Патент USA US3080628

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March 12, 1963
A. SCHILTKNECH-T
3,080,618
cums AND WEIGl-ITING APPARATUS FOR THE TOP ROLLS OF A DRAFTING
.
'
ARRANGEMENT OF A SPINNING MACHINE
Filed Sept. 6, 1960
Fly. 7
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March 12, 1963
GUIDE AND WE
Filed Sept. 6. 1960
.
A, SCHILTKN
HT
3,080,618
TING APPARATUS FOR THE
P ROLLS OF A DRAFTING
RRANGEMENT OF‘ A SPINN
MACHINE3
Sheets-Shegt 2
v
March 12, 1963
A. SCHILTKNECHT
3,080,618
GUIDE AND WEIGHTING APPARATUS FOR THE TOP ROLLS OF A DRAFTING
ARRANGEMENT OF A SPINNING MACHINE
Filed Sept. 6, 1960
47
3 Sheets-Sheet 3
4951
2732513053
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United States Patent O?ice
3,380,618
Patented Mar. 12, 1963
1
2.
3,630,618
the holders, displaceability being afforded by threads on
the spindle and in the element and in the holder. The
pitches of the cooperating threads on the spindle and in
the element and of the cooperating threads on the spindle
GUEBE AND WEiG-HHNG APPARATUS FSR THE
TSP RQLLS QT‘ A DRAFTENG ARRANGEMENT
0F A Sl’l-INNTNG MAQHTNE
Adoif §ehilthnecht, Winterthur, Switzerland, assignor to
Actiengeseilsehaft .lioh. .liaeo‘b Rieter & (Zia, Winterthur,
Switzerland, a corporation of ?witzerland
Fii d Sept. 6, 19%, Ser. No. 53,973
Claims priority, application Switzerland Sept. 11, 19559
if (Ilaims. (Cl. 19-4267)
and in the holder are different so that, upon rotation
of the spindle for changing the distance between the
holders, the leverage relation of the holders with re
spect to the swing fulcrum of the element is not changed.
The guide and weighting arm can be locked in the
10 operating position in the conventional manner.
The present invention relates to a guide and weighting
apparatus for the top rolls of drafting arrangements in
The apparatus according to the invention may be pro
vided with means affording independent removal of the
foremost pressure roll when the guide and weighting arm
spinning machines.
The arms for guiding and weighting the top rolls of
is swung down and locked. This means includes an
drafting arrangements must permit adjustment of the 15 elbow lever preferably located inside the forward end
position of the pressure rolls to correspond to the char
_of the guide and weighting arm. The elbow lever has
acter of the spinning material to be drafted whereby the
an arm whose end, upon swinging of the lever, extends
weightin0 of the pressure rolls should be changed as little
below and engages suitable shoulders provided on the
as possible. To produce this desired result, individually
holder of the foremost pressure roll whereby the holder
adjustably spring-loaded pressure roll carriers have been 20 is tilted upon continued swinging of the elbow lever
proposed. There is, however, usually not enough room
for springs having the desired ?at compression character
and the top roll can be removed.
With the apparatus according to the invention the
istic and producing the high pressures which are required
in modern drafting arrangements. Springs having a steep
compression characteristic are not suitable because there
the same guide and weighting arm remains substantially
the same even if the position and/or diameters of the
weighting force applied to a plurality of top rolls by
is too much difference in pressure if one pair of pressure
rollers is more worn than another pair which is weighted
top rolls relative to each other are considerably changed.
In drafting arrangements having cradles for the upper
aprons of double apron arrangements wherein the length
by the same spring. Repeated grinding of the pressure
rolls causes dilferences in diameter of the rolls which
necessitates readjustments which consume time and are
of the cradle is between 40 mm. and 80 mm. the de
viations of the pressures acting on the intermediate pres
sure rolls and on the delivery pressure rolls at different
adjustments of the spacing of the pressure rolls can be
expensive.
Conventional drafting arrangements which are weighted
held below 18%. This is entirely satisfactory, particu
the disadvantage of changing the load or pressure dis
larly if the pressure acting on the back top roller is;
tribution upon readjustment of the pressure saddles. 35 maintained constant as is the case in the weighting system
according to the invention.
These changes must either be disregarded or must be com
pensated by additional adjustments. it has been pro
The novel features which are considered character
posed to place the fulcrum of a load-distributing lever by
istic of the invention are set forth with particularity in the
by means of a lever or a centrally arranged spring have
means of conical pressure saddles so that a predetermined
appended claims. The invention itself, however, and
pressure distribution is maintained. In this case the in 40 additional objects and advantages thereof will best be
volved two pairs of pressure rollers are simultaneously
understood from the following description of embodi
repositioned which is usually not desirable. Arrange
ments have been proposed in which the roller groups
ments thereof when read in connection with the accom
panying drawing, wherein:
forming two drafting zones with a neutral zone therebe
FIG. 1 is a schematical longitudinal sectional view of
tween are simultaneously readjusted in a predetermined 45 a guide and Weighting apparatus according to the in
relation whereby a substantially constant pressure is main
vention, the section being made along line 1-1 of FIG. 2.
tained on the top rollers. The last mentioned arrange
FIG. 2 is a cross sectional view of a part of the guide
ment is objectionable, because the drafting zones cannot
and weighting apparatus shown in FIG. 1, the section
being made along line II——II of said ?gure.
be readjusted independently of each other.
it is an object of the present invention to provide a
FIG. 3 is a part sectional side view of the forward
weighting system for the top rollers of a drafting ar
rangement of a spinning machine which system overcomes
the above described disadvantages of conventional sys
portion of a guide and weighting apparatus of the general
type schematically shown in FIGS. 1 and 2, in operating
position.
tems by providing a weighting lever which is preferably
FIG. 4 is a longitudinal sectional diagrammatic illus
placed inside a guide and weighting arm for the top 55 tration of the forward part of a guide and weighting ap
paratus in position for removing the delivery roll held by
rollers. The rear end of this weighting lever rests on
an element transmitting a weighting force from a force
producing means to the weighting lever. A pressure roll
assembly is pivotally connected to the fore end of the
the arm.
'
FIG. 5 is an enlarged sectional illustration of a part.
of a device for producing pressure and transmitting it to
weighting lever. A link supporting top roll guide means 60 a weighting leverin the apparatus according to the in-‘
vention.
is pivotally connected to an intermediate part of the
weighting lever and is pivotally connected to the guide
FIG. 6 is a longitudinal sectional view of a modi?ed.~
and weighting arm.
The aforesaid pressure roll assembly comprises a
spindle which is substantially parallel to the weighting
saddle for the rear pressure rolls of a drafting arrange
ment.
65
Referring more particularly to FIG. 1 of the drawing,
numeral 1 designates a tubular carrier which is rigidly
lever and which extends through an element which is
connected to the frame of a spinning machine and extends
pivotally connected to the fore end of the weighting lever.
longitudinally thereof. Regularly spaced supports 2 are
A top roll holder is supported by the spindle forward
of said element and a second top roll holder is supported 70 mounted on the carrier 1, a guide and weighting arm 3 of
inverted U-shaped cross section being swingably con-_
by the spindle rearward of said element. The spindle is
nected at 4 to each [support 2. The arm 3, when in'
longitudinally displaceable in said element and in one of
operating position, is locked in the conventional manner
3,080,618
3
to the support 2 by‘ means of a locking lever 5 having an
arm to whose end a roller 6 is connected which is re
ceived in a slot 7 of the support 2 when the device is in
locked position.
The weighting force is produced by means of a pres
sure ?uid in a hose 8 placed inside the carrier 1 and longi
tudinally thereof. The pressure acting on the inside of
the hose 8 is transmitted to a pressure shoe 9 resting on
the hose 8 and connected to the end of one arm of an
4
pressure roll holder 42 on the rod 30. According to the
invention all pressure reactions caused by the pressure
rolls and acting on the weighting lever 16, 17 are independ
ent of the position of the pressure rolls.
If the bracket 13 is somewhat displaced forwardly in
order to increase the angle a formed by a vertical and a
line connecting of the centers of the delivery top roll 43
and the drafting roll 44, the cylindrical element 19 is
also moved forward whereby the lengths of the arm of
elbow lever 10 which is fulcrumed at 11 to the support 2. 10 the elbow lever 10 is shortened so that the force acting
on the weighting lever 16, 17 is increased. As seen in
A bracket 13 of inverted U-shaped cross sectional con
FIG. 5, the active ength of the lever 10 is the distance
?guration is mounted inside the arm 3 between the verti
between the center M of the fulcrum of the lever 10 and
cal ?anges 12 of the arm. The bracket 13 is provided
the point A where the element 19 rests on the lever 10.
with a longitudinal slot 14 receiving a screw 15 for con
In order to maintain the loading force F’ constant, the
necting the bracket 13 to the arm 3. The slot 14 affords
surface 45 of the elbow lever 10 is curved so that the
longitudinal displacement of the bracket 13 relative to the
direction of the increased force P, to be transmitted at
arm 3. A weighting lever is composed of parallel mem
the point B, is changed and acts in a forwardly inclined
bers 16 and 17 whose ends are interconnected and which
direction, whereby the substantially vertical force com
are individually located between and parallel to the ?anges
ponent P” which effects the weighting and is parallel to P’
12 of the arm 3 and the ?anges of the bracket 13. The‘
is
correspondingly smaller and remains with respect to
rear ends of the members 16 and 17 extend beyond the
greatness and direction equal to the force P’. The sur
carrier 1 and are connected by a cylindrical element 19
face 45 is shaped to suit individual conditions. In the il
resting on the elbow lever‘ 10 (FIG. 5)-. An element 21
lustrated
example the surface is cylindrical so that its in
is pivotally connected at 21’ to the forward ends of the
clination increases in forward direction (FIG. 5).
members 16 and 17. The element 21 is provided with a
An elbow lever 47 is swingably mounted by means of
threaded bore 20 receiving a spindle 23 (FIG. 4) pro
a
bolt
46 on the forward end of the arm 3 between the
vided with a thread 22 ?tting into the thread of the bore
?anges 12 and has two separate lower portions 48 (FIG.
20. The rear part of the spindle 23 is provided with a‘
3) which extend laterally of the pressure roll holder 26.
thread 24 whose pitch is different from the pitch of the
A spring 49 effects abutment of the elbow lever 47 against
30
thread 22 for purposes which will be explained later.
a forward portion 50 of a bearing for a clearer roller,
The thread 24 ?ts the thread of a bore in a top roll holder
not shown. The top of the pressure roll holder 26 is
25 supported by the spindle 23 in the rear of the element
provided with laterally protruding shoulders 51 which
21. A fore top roll holder 26 is rotatable on the fore end
are abutted by the lower portions 48 of the elbow lever 47
of the spindle 23 but is prevented to move axially with
respect to the spindle by means of an annular groove 27 35 when the latter is swung counterclockwise, as seen in FIG.
4, so that the holder 26 is lifted upon continued counter~
in the spindle and a splint 28 extending through the
clockwise swinging of the elbow lever 47. This facilitates
holder. The forward end of the spindle 23 is provided
removal of the pressure roll 43 from the holder 26 in a
with a slot 29 adapted to receive a screwdriver for revolv
forward and downward direction without lifting the guide
ing the spindle 23. The relation between the pitches of
and weighting arm and without taking the pressure off the
the threads 22 and 24 is such as to correspond to the rela~
top rolls. A removed pressure roll 43 is shown in dash
tion of the distances between the element 21 and the
dot lines in FIG. 4.
‘
holders 25 and 26. Therefore, the pressure roll holders
In FIGS. 3 and 4 an upper apron 52 and a cradle 53
25 and 26 can be moved relative to the fulcrum 21' with
is shown. The forward part of the cradle is pressed
out changing the relation between the distances between
down by the rear portion 56 of a spring extending into
the element 21 and the holders 25 and 26, and the holders 45 a cavity 54 in the pressure roll holder 26. The spring
25 and 26 always receive the same fractions of the pres
has a second end portion 55 which retains the ?rst top
sure exerted on the fulcrum 21', i.e., the weight on the
roll in the holder 26. In a drafting device having no
holders is not changed unless the force transmitted by
cradle for an apron, the rear portion 56 of the spring is
the weighting lever 16, 17 is changed.
omitted. The top roll guide and retainer is the same for
A transverse rod 30 interconnecting the members 16 50 both apron and non-apron drafting devices.
and 17 forms a fulcrum for a double link element 31
_ FIG. 6 shows an arrangement in which an element 57
which 'extends‘rearward and downward ‘from the fulcrum
1s longitudinally adjustably connected to the rail 33 and
and whose ends are connected .by a pin 32 swingably
swingably supports a pressure roll assembly 58 which is
supporting a rail 33 which has a U-shaped cross section,
alike the assembly swingably supported by the element 21
55
as shown in FIG. ,2. The double link element 31 is pivot
which is shown in FIGS. 1 and 4. The embodiment
ally ‘connected ‘by means of a transverse bolt 34 to the
shown in FIG. 6 is part of a four roll drawing or drafting
bracket 13. A bolt 35 extends through the forward ends
frame. The bottom rolls shown in FIG. 6 replace the
of the ?anges of the rail 33. A central element 36 has a
third roll shown in FIG. 1.
forward end provided with a slot 37 receiving the bolt 35
I claim:
and extends rearward and upward from the bolt 35. The 60
1. A guide and weighting apparatus for the top rolls
rear end of the element.36 is also provided with a’ slot 38
of a drafting arrangement of a spinning machine, includ
which is parallel to the slot 37, the slot 38 receiving a
mg a frame, an arm swingably connected to said frame,
bolt 39 which is rigidly connected to the bracket 13.
locking means operatively connected to said frame and to
The element 36 is ‘thus horizontally slidable on the bolts
said
arm for locking said arm in the operating position
35 and 39. The link.31 and the central element 36 are 65
and permitting upward swinging of said arm out of the
swingably interconnected by means of a bolt 40. The
operating position, a weighting lever having a substantial
element 36 which is operatively connected to the link 31,
portion‘ located within said arm, said weighting lever
to the rail 33 and to the arm 3, through the bracket 13,
having a fore end and a rear end, ?rst top roll guide means
guides the rail 33_to move parallel to itself upon'swing
70 swingably connected to said fore end, second top roll
ing of the link 31 on the ,arm 3.
guide means, a link having a ?rst end pivotally connected
As seen in FIG. 2, the rail 33 is provided with a longi
to said second top roll guide means, said link having a
tudinal slot 41 for connecting a pressure roll holder 42 in
second end pivotally connected to an intermediate part of
a desired position along the rail 33. In this way the hold
said ‘lever, said link being swingably connected to said
er42 can be placed in any desired position on the rail 33
arrn tonswing on an axis which is parallel to and spaced
without changing thereactionof the force exerted by the
5
3,080,618
from the pivot axes of said pivotal connections, pressure
producing means mounted on said frame, and pressure
transmitting means engaging said pressure producing
means and movably connected to said frame, the rear
end of said lever resting on said pressure transmitting
means for receiving the pressure transmitted by said trans
mitting means.
2. A guide and weighting apparatus as defined in claim
6
face being forwardly and downwardly curved to provide
an increasing decline of the surface for compensating the
increase of the force acting on the rear end of said Weight
ing lever when the latter is moved forward.
8. A guide and weighting apparatus as de?ned in claim
1 wherein said ?rst top roll guide means includes an ele
ment swingably supported by said weighting lever, a
spindle longitudinally displaceable in and supported by
1 and wherein means are operatively connected to said
said element, a fore top roll holder supported by said
link, to said second top roll guide means and to said
spindle forward of said element, a second top roll holder
arm for guiding said second top roll guide means to move
supported by said spindle in the rear of said element, said
parallel to itself upon swinging of said link on said
second holder being longitudinally displaceable on said
arm.
spindle for changing the spacing between said holders; said
3. A guide and weighting apparatus as de?ned in claim
spindle, said element, and said second holder including
1 and wherein said second top roll guide means includes a 15 means for maintaining the leverage relation of said holders
rail and a top roll holder mounted on said rail, said rail
with respect to the swing fulcrum of said element when
being pivotally connected to said link, and wherein an ele
the spacing between the holders is changed.
ment is pivotally connected to said link and has ends indi
9. A guide and weighting apparatus according to claim
vidually swingably and slidably connected to said rail and
8 including means swingably connected to said arm and
to said arm to slide in a direction parallel to the longitudi 20 adapted to engage said fore top roll holder for lifting the
nal axis of said rail for guiding said rail to move parallel
latter when said arm is locked in the operating position
to itself upon swinging of said link on said arm.
to permit removal of the fore roll from the fore holder.
4. A guide and weighting apparatus as de?ned in claim
1 and wherein said second 'top roll guide means includes
a rail pivotally connected to said link, means operatively
10. A guide and weighting apparatus according to
claim 9 and wherein said fore top roll holder is provided
connected to said link, to said rail and to said arm and
constructed and arranged so as to guide said rail to
move parallel to itself upon swinging of said link on said
arm, and a top roll holder supported by said rail and
adapted to be displaced longitudinally of said rail.
5. A guide and weighting apparatus as de?ned in claim
1 and wherein a bracket is connected to said arm and dis
placeable longitudinally of said arm for adjusting the
position of said bracket relative to said arm, and said link
is swingably connected to said bracket.
6. A guide and weighting apparatus according to claim
5 and wherein said pressure transmitting means include
pressure compensating means for maintaining constant the
pressure received by the rear end of said weighting lever
when the position of the latter relative to said pressure
transmitting means is changed.
7. A guide and weighting apparatus according to claim
with a shoulder and said means which are swingably eon
neeted to said arm are in the form of an elbow lever
having an arm adapted to abut said shoulder.
11. A guide and weighting apparatus as de?ned in claim
1 and wherein said second top roll guide means includes
a rail pivotally connected to said link, means operatively
connected to said link, to said rail and to said arm for
guiding said rail to move parallel to itself upon swinging
of said link on said arm, an element swingably connected
to said rail, a spindle extending through said element and
being longitudinally displaceable therein, a ?rst top roll
holder supported by said spindle forward of said element,
a second top roll holder supported by said spindle rear
ward of said element, one of said holders being longitu
dinally displaceable on said spindle for changing the
spacing between said holders; said spindle, said element,
and said displaceable holder including means for main~
taining the leverage relation of said holders with respect
5 wherein said pressure transmitting means includes a
to the swing fulcrum of said element when the spacing
pressure transmitting lever swingably connected to said
between the holders is changed.
frame and having a rearwardly extending arm acted upon 45
by said pressure producing means and having a surface on
No references cited.
which the rear end of said weighting lever rests, said sur
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