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Патент USA US3091824

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June 4, 1963
Filed March 20, 1958
3 Sheets-Sheet 1
June 4, 1963
Filed March 20, 1958
3 Sheets-Sheet 2
June 4, 1963
Filed March 20, 1958
3 Sheets-Sheet 3
United States Patent Ciiìce
Patented .lune 4, 1963
Richard Huber, Stuttgart-Nord, and Friedrich Kühler,
Stuttgart-Bad Cannstatt, Germany, assignors to SKF
Kugellagerfabriken Gesellschaft mit hesehrankter Haf
tung, Schweinfurt, Germany, a corporation of Germany
Filed Mar. 20, 1958, Ser. No. 722,673
Claims priority, application Germany Mar. 29, 1957
13 Claims. (Cl. 19-28i)
ment of the elements of the drafting mechanism is in
volved. In many cases, moreover, the space necessary for
the installation of additional weighting springs is not avail
able inside the drafting mechanism. However, it is im
possible «to obtain a very high weighting pressure on a
guide arm with only one single helical spring because this
would have to be of a comparatively stijf construction or
would reach dimensions which would make it unsuitable
for installation in a drafting mechanism. A particular
10 disadvantage of stiff helical springs, apart from a corre
This invention is for improvements in or relating to
textile drafting mechanism and is concerned with mecha
nism having a pivotally mounted top-roll carrier arm
which can be locked, in the operating position, to a sta
tion-ary part of the machine and which receives top rolls
on guide arms which are adapted for lateral swinging
on which rest the weighting means acting.
on the top rolls.
spending increase in the lateral force, is the relatively
steep spring characteristic. This means that in the event
of the guide arm carrying the top rolls swinging down
to the plane of the drafting field to differing extents, there
is a marked variation in the pressure acting on the corre
sponding top rolls. In practice, however, such variable
downward swinging cannot 'be avoided because the roll
covers are reground at intervals and become smaller in
is necessary for the axes of the top rolls to be parallel to 20 diameter as a result, so that the guide arm swings further
down `and the spring exerts a considerably reduced pres
those of the bottom rolls during operation. For this
sure on the top rolls in accordance with the aforesaid
reason, constructions have been designed wherein the
steep characteristic. On the other hand, there would be
twin top rolls are mounted in guide arms received for
a corresponding increase in pressure if the spring force
lateral swinging movement in the top-roll carrier arm, so
that they can automatically align themselves parallel to 25 were adapted to an laverage roll diameter and a top roll of
For the faultless operation of a drafting mechanism, it
the ‘bottom rolls during operation. The biasing or weight
ing of the top rolls is effected, in these constructions, by
helical springs which bear at one end on the guide arm
and at the other end lagainst a fixed abutment in the top
maximum diameter were used. Such variations in weight
ing pressure, combination with the inaccurate parallel
alignment of the `axes of the top rolls with those of the
bottom rolls, caused by the aforesaid lateral forces of the
springs, lead to uneven and faulty yarn when the drafting
roll carrier arm. Although helical springs have proved 30 mechanism
is in operation.
satisfactory in practice as weighting means yfor top rolls
of the present invention to overcome
at low weighting pressures, they have the disadvantage
these disadvantages and to provide a drafting mechanism
that, in addition to forces acting in the direction of their
wherein the transmission of high pressures to the top rolls
central longitudinal axis, laterally acting forces also arise
which, particularly at high pressures, assume a value 35 is -assured without adversely affecting their satisfactory
self-alignment parallel with the bottom rolls, and where
which counteracts an accurate self-alignment of the guide
in despite defection of the guide ar-m carrying the top .
arms or of the twin top rolls parallel to the bottom rolls.
rolls, during operation, a substantially constant pressure
As a result, there is interference with the advantageous
is assured. According to the invention, this object is
results intended to be obtained by the provision for lateral
swinging of the guide arms in the top-roll carrier arm or 40 achieved Áby arranging that `the weighting means allocated
to the guide arm are mounted, together with their seat
this lateral swinging may be entirely prevented if very
ings, for lateral swinging movement, and that the guide
arms are supported with point or line contact by two re
taining members arranged inside the top-roll carrier arm.
in quality of the yarn produced.
In order to overcome this disadvantage, it has been 45 By the adoption of this arrangement, the adverse effect of
the aforesaid lateral forces of the springs is eliminated
proposed that the springs should Ibe tested for the direction
in a reliable manner during the operation of the drafting
of their aforesaid lateral forces before being installed in
the drafting mechanism, and should be installed in the
drafting mechanism in such a setting that the said lateral
forces >operate in a neutral direction, that is to say longi
tudinally of the top-roll carrier arm. In this manner, the
action of the lateral forces was rendered comparatively
while the aforesaid lateral swinging
movement takes place in directions parallel to the plane of
the drafting iield Áb
harmless. However, the testing of each individual spring
which was necessary, and the careful installation thereof
in the drafting mechanism, involved considerable expendi
ture of time and labor and hence corresponding high costs.
In drafting mechanisms in which very high weighting
pressures are required, one helical spring is »often not suffi
cient as a weighting means, so that a plurality of weighting
55 guide arm is mounted in the carrier arm for lateral swing
ing movement, with the weighting means allocated there
to, about a »single axis. However, depending on require
ments, several or all of the guide arm's may be arranged in
this manner.
Preferably, the retaining members take the form of
springs have to be installed, connected one behind the 60
pins around which there engage bearing tongues on a
other, for example. As a result of the adoption of this
holder carrying the guide arm, and it is advantageous to
construction the lateral forces of the springs are apt to as
mount these retaining members in a stirrup detachably
sume too high a value, and in addition, a clumsy arrange
housed inside the carrier arm. In this manner, the dis
tance between the top rolls can easily be varied by adjust
ing members. The stirrups may, like the guide arm, be
manufactured in a simple manner from sheet metal so that
the seatings for the weighting means, which may, for
example, take the form of helical springs, can be ím
pressed directly in the guide arms.
The retaining members may be two in number, one
'located above the other and the guide arms may be bent
into substantially right angled formation with one por
tion engaging at its end around the upper retaining
member after the fashion of half a bush, and being
supported against the »lower retaining member either
directly or through an interposed additional member.
As mentioned above, the retaining members are prefer
ably in the form «of pins. These may advantageously be
arranged with their longitudinal axes parallel to the
aries of the top rolls and be provided with bearing
surfaces lfor the guide arms or for the holders carrying
of the top~roll carrier arm. Alternatively, angled por
tions may be bent inwards from the top-roll carrier arm
to limit the downward movement of the guide arm.
Embodiments «of the invention are illustrated by way
y‘of example in the drawings. In these drawings:
FlGURE 1 shows a top-roll carrier and weighting arm
in elevation, partially in section;
FIGURE 2 shows a somewhat modified construction
of a tcp-roll carrie-r arm, in elevation and partially in
FlGURE 3 shows a section ’on the line -lII-TII in
FIG-URE 4 shows ano-ther modified construction of a
top roll carrier arm, in longitudinal section;
FIGURE 5 shows a section lon the line V-V in FIG~
URE 4;
FIGURE. 6 shows a further embodiment ot the carrier
arm in longitudinal section;
FÍGURE 7 shows a section on the line VII-_VII in
the guide arms. For example, the bearing surfaces may
be constituted by the cylindrical surfaces of the pins or 20 FlGURE 6;
FIGURE 8 shows a single guide arm in accordance
may consist fof circumferential grooves in which corre
with FiGURE 6, in plan view;
spondingly shaped ribs «on the guide arms or holders
FÍGURE 9 shows a further embodiment of the carrier
engage. Such'ribs may alternatively rest on the cylin
partially in longitudinal section;
drical surface :of the pins. In either case, it is advisable
FIGURE l() shows a section on the 'line X-«X in FIG
to select the dimensions in such a manner that only a point
Y or line Contact is obtained on the pins as a result of whichl
'URE 9;
FIGURE ll shows a plan view »of a guide arm with an
there is practically no friction which might hamper satis
additionalsupporting portion, in accordance with FIG
factory self-alignment of the guide arms.
It is also contemplated, in carrying out the present in
Referring -iirstl'yV to FiGURE l, a top-roll carrier arm
vention that the guide arm may be formed of resi-lient 30 2, which is bent substantially into the form of a U in
material through tension in which the top «rolls are biased
cross-section, is pivotally mounted ‘on a supporting bar
or weighted, and, if desired, an additional weighting
l lined to the machine and is held in the operating posi
spring may be allocated to one or more guide arms in a
tion by means of a locking device. This locking device
carrier arm. 'The weighting pressures may be consider
is not shown in FlGUlìE l but may be similar to Athe de
ably increased by the installation of an additional weight
vice shown at 103 in FiGURE 2 lwhich cc-operates with
ing spring, the characteristic curve of which is compara
a stationary part or vthe machine, Received inside the
tively gradual so that, in the event of a variation in the
arm Z >tor longitudinal adjustment therealong are stirrups
distance which the guide arm swings downwardly carry
4 and ‘74 with downwardly bent arms, which can be lo
ing the top rolls towards the corresponding bottom rolls, 40 cated by screws o reaching through a slot 5 in the arm 2.
no variation in weighting pressure takesplace or only a
The stirrup 4 shown in FIGURE 1 at the side remote
slight variation which is insignificant in practice.
from the'supporting‘ bar l comprises retaining members
The additional fweighting spring aforesaid may take the
constructed in the form of pivot pins 7 and '77 around
form of a leaf spring and may be bent at an angle and
which are >received pin-engaging means or tongues 8 o1'
mounted inside the guide arm, and provided with Vguide 45 'lâ on a holder 9. The holder 9‘ carries, on angled arms
means, for example an impressed trough, which engages
9', a pivot pin 1€? for the pivotal reception ot a substan
over a correspondingly formed guide, for example a rib,
tially angle-shaped guide ‘or support arm 1l, the lower`
in the guide arm. The angular additional weighting spring
end of which is constructed in a manner known per se with
may, with advantage, be supported at each end on por
tions 'of the guide arm.
The additional weighting spring may also take the
form of a helical spring, one end ci which bears on one
portion of the guide arm, while its other end bears on
a support carried on the other portion of the guide arm.
The said support may either be integral with the guide
arm lor be mounted thereon as an added member as
desired. The latter alternative enables the guide arms
to be modiiied in a simple manner to receive additional
weighting springs as a result of which, as mentioned above,
a saddle-shaped support l2 to receive a pair of top rol-ls
50 i3 indicated in chain line in the drawing (see FIG. 5).
A seating 14 to 4receive one end of bias means in the
formïof a helical spring 15 is impressed in the upper end
of the guide arm il. The other end of the helical spring
i5 rests against a seating 14’ pressed out of the holder
The holder 9* and «the guide arm `11 constitute an
articulated guide-arm assembly having entirely self-con
tained bias means in the form of the spring l5, urging
the support portion l2 downwardly to press the roll i3
the roll 16.
a considerable increase is immediately possible in the 60 against
A contact lug .1S provided on angled webs in the guide
weighting pressures acting on particular top rolls, while
arm il bears against an abutment 17 on the arm 9’ of
retaining a gradual characteristic curve iorrthe spring.
the holder 9 and thus limits the swing 4of the guide arm
According to the invention, the downward swing of
il about the pivot 1d.
the guide arms may be limited by stops, and the stops
The lholder § and therefore the entire guide-arm assem
may consist, for example, of contact lugs or the like con 65 bly can also swing laterally parallel to the plane of the
nected to the guide arm and, if a holder is used, of an
«drafting field, to accommodate which movement the
abutment mounted on an associated particular holder. it
tongue S comprises a pressed out rib â’ which is re
is further advisable to construct the stops in the form
ceived in a circumferential `recess in the pivot pin 7. The
of anchors with supporting 'tabs against which the guide
tongue ’78 cooperates with the pin ’77 in like manner. In
arms bear to limit their downward swing. Loops or rings 70 this manner, the twin top rol-l 13, which rests as usual,
may also serveras stops, which at one end engage under
a hump yon the guide arm and at the other end are re
on the bottom roll 16, indicated in chain line in the draw
ing, can automatically align itself, bringing its axis parallel
ceived in a guide in a stationary part of the drafting
tothe axis of the bottom roll. The spring llâ', with its
mechanism, for example the stirrup or holder. A further
seatings 14 and i4', also swings about the pivotV provided
construction or the stops is »one in which lugs are bent 75
the ribs.
‘out or’ the guide arm, and rest against angled portions
In the embodiment illustrated in FIGURE l, the two
stirrups 74 most adjacent to the support bar 1, com
prise pivot pins 19 on which the guide or support arms
11’ are mounted for pivoting only. The weighting or
biasing of each of these guide arms r11’ is likewise affected
by bias means in the form of helical springs 15’ each of
which rests on the one hand against a seating pressed out
of the guide arm 11' and on the other hand against a
seating pressed out of the stirrup 74. A limitation of the
swing of the guide arms 11’ is obtained by means of parts
35” bent out of the guide arms, bearing against corre
sponding abutment surfaces on the stinrup 74. The slot
5 and the lixing screws 6 for the stirrups 4 and 74 are
covered by a hood 20 which is pivotally mounted on the
arm 2, thus preventing the penetration of ñulf into the
interior of the arm 2.
In the embodiment shown in FIGURES 2 and 3, an arm
102 similar ‘to the arm 2 receives pivot pins 22 and 122 for
the direct reception of a holder 21. The holder 21 com
pivot pins 87 and the guide arms 3‘5 and 35', the latter
have ribs 35 pressed 'out which rest with point or line
contact on the pins 87. Similar ribs are provided at 36'
to engage the pin 88, so that the arms 35 and 35', as can
be seen from FIGURE 5, can swing laterally in the direc
tion of the arrow A parallel to the plane of the drafting
field. In its front end, each of the guide arms 35 and 35’
comprises a saddle-shaped support y112 to receive the twin
top rolls 13, which are indicated in chain line and which
co-Joperate with bottom rolls 16, likewise illustrated in
chain line. In order to limit the swinging of the lower
arm of the guide arms 35 and 35', holding the twin top
rolls 13, a guide, in the form «of a slot, is provided at 37
in the stirrup 84 and at `37’ in the stirrups 85 to receive
a loop or ring 39 or 39’ which reaches under a hump 38
bent out of the guide ar . The length of the guides 37
and 37’ should be such that, when the arm 202 is swung
down towards the bottom rolls 16, the 'top rolls 13 are
prises pin-engaging means in the form of bearing tongues 20 raised so far that the loops 39 and 39l are above the bot
tom end yof the guideways 37 and 37’ and when the arm
23 and 123 with impressed ribs which engage in recesses in
2112 is locked in operative position (see FIGURE 4) the
the pins and permit a lateral swinging movement of the
top rolls exert the pre~set pressure on the bottom rolls 15.
holder 21 parallel to the plane ofthe drafting lield (see par
As a result `of the resilient construction of the guide arms
ticularly rib 23’ and recess 24 in the pin 22 in FIG. 3). At
its front end, the lholder 21 is extended and provided with 25 35 and 35', a little or no variation biasing pressure occurs
when the top rolls 13 are displaced perpendicular to the
an impressed seating 26 to receive bias means in the form
plane of the drafting held, because the spring character
of a helical spring 25, the other end of which rests against
istic curve is very gradual even at high pressures. The
a seating 26’ in the glide or support arm 28 which is re
resilient guide arms `35 and 35’ and the associated saddle
ceived for pivoting about a pin 27 mounted in the holder
21. The holder »21 further comprises at its lower end, 30 shaped supports 112 comprise guide arm assemblies hav
ing entirely self-contained bias means and operable to
hook-shaped Contact lugs 29‘ which engage under a web
swing laterally on the pins 37 and 88 parallel to the plane
30 constructed in the form of an abutment face on the
of the drafting field.
guide arm 2S and thus limit the swing of the guide arm
Should a considerable increase in the pressure be neces
28 after the release of the arm 11.22 by the locking device
103. The guide arm 28 is constructed at its lower end 35 sary in such a drafting mechanism, then, as can be seen
rom FIGURE 4, an additional bias in the form of a leaf
with a saddle-shaped support 31 which carries the twin
spring 4€)y bent at an angle is interposed between the lower
top roll 13. The holder 21, the guide arm 2S and the
pin S3 an-d the guide arm 35. This additional spring 40
spring 25 constitute an articulated guide arm assembly
is provided, in the region of the lower pin 88, with a
having entirely self-contained bias means and yoperable to
swing laterally on the pins 22 and 122 parallel to the 40 stamped tout trough 41 with which it engages over the
corresponding rib 36’ in the guide arm 35 and rests with
plane of the drafting ñeld.
point lor line contact on the pin S3. As a result, a con
The two guide or support arms 28’ adjacent to the sup
which is held against displacement in the arm 102, for
siderable increase in pressure is rendered possible while
retaining a perfect ability for the whole guide arm 35
example by a screw 6 in a slot 5. Each helical spring 25’
becoming steeper.
porting lbar 1 are each pivoted on a pin 32 in a holder 33
(only one is shown) rests against seatings pressed out of
the guide arm 28’ and the holder 33. A limitation of
the swing of the guide arm 28' (FIGURE 2) is effected
by means of parts 34 bent out of the holder 33 (FIGURE
to swing laterally, without the springs characteristic curve
In order to secure the guide arms 35 and 35’ inside the
stirrups »84 and S5, tongues 42 are pressed out of the
latter so that the portion of each guide arm 35 and 35’
' 3) against which the guide arm 2S' bears. The mode of 50 lying between the two pins 87 and `38 is limited as toits
downward or oounterclockwise swinging movement.
` operation of the holder of FIGURE 2 corresponds with
Referring now to FIGURES 6_8 of the drawing, it will
' that o-f the one shown in FIGURE l, though no provision
be seen that a helical spring 43 may also be used as addi
is made for longitudinal adjustment of the holder 21 in
tional biasing spring, which rests with one end on the
the arm 192.
In FIGURES 4 and 5 of the drawing there is shown a 55 free resilient arm of the guide arm l135 carrying the twin
top roll 13 and with the other end on a supporting mem
top~roll carrier arm 202 which is bent substantially into
ber 44 on the guide arm 135. This supporting member
a U-shape and is closed at its two ends. The arm 202
44 is preferably made integral with the guide arm y135
is secured by means of a bracket 1', indicated in chain
and constructed at its front end in the form of a spring
line in the drawing, to the supporting bar 1 which is ñxed
to the machine and likewise indicated in chain line. At 60 retainer 44’ to receive the upper end of the helical spring
43. To limit the swinging Iof the lower arms of the guide
the top, the arm 202 comprises slots or bores 5 through
arms 135 carrying the top rolls 13 outwardly bent lugs
which screws 6 reach to secure the stirrups 84 and 35 in
45 are provided thereon (see particularly FIGURE 7)
place. As in the other embodiments, these are provided
to bea-r against inwardly bent portion 46 of the arm 212.
with downwardly bent arms and are longitudinally ad
justable along the arm 262 according to the length of the 65 The mounting Aof the guide arms 135 inside the stirrup
214 and the securing of the stirrups inside the top-roll
slots 5. Mounted between the downwardly bent arms of
carrier and weighting arm 212 is effected in the same man
the stirrups 84 and 85 are the pivot pins 87 and 8S to
ner as in the embodiment shown in FIGURE 4. The
receive double-armed guide arms 35 and 35’ of resilient
arms i135 and their associated saddle-shaped sup~
material which serves as the biasing means. One arm of
the guide arms 35 and 35’ is arranged between the arms 70 ports comprise guide arm assemblies having entirely self
contained bias means and operable to swing laterally on
of the stim'up 84 and is constructed with a pin-engaging
the pins of the stirrups 214 in the plane of the drafting
tongue in the form of half a bush at its free upper end so
that it engages partly around the upper pin 87, The guide
arm merely rests against the lower pin 88 of the stirrup
84. In order to reduce the friction between the upper
In the guide arm 235, which is illustrated in the drawing
at the front end of the a-rm 222, the supporting portion
144, which forms a spring retainer 144’ for the helical
spring 143, is integral with the guide arm 235. In con
trast to the embodiments shown in FIGURES 1 to 8, an
anchor 147, which reaches through slots or perforations
in the guide arm 235 and the supporting portion i144, is
provided for limiting the swinging movement of the guide
arm 235 about the pivot. At its ends, the anchor 147 is
'provided with bent or twisted tabs 148 and 148’ (see
particularly FIGURE 10) which effect «the said limitation
by bearing against the edges of the slots in the guide arm
235 and supporting portion 144. The guide arm 235, the
support portion 144, the spring '143, the anchor 147 and
may be varied. A further stirrup may also be received
inside the arrn 222, depending on the length of the slot
and the practical requirements.
It is to be understood that the invention is not re
stricted to the precise constructional details set forth.
Y We claim:
l. Textile drafting lmechanism comprising a series of top
and bottom rolls defining therebetween a drafting field, a
top roll carrier arm, pin means rigidly mounted in said
carrier arm, |and a guide arm assembly for one top roll
having at one end portion pin-engaging means mounted
on said pin means and supporting said guide arm as
sembly for lateral swinging movement parallel to said
drafting field and restricting said pin-engaging means
against pivotal movement on said pin means perpendicu
bly having entirely self-contained bias‘means and oper
lar to said drafting field, said guide arm assembly includ
able to swing laterally on the pins of the carrier arm
ing top roll supports at the-opposite end portion thereof
222 in the plane of the drafting field.
mounted 'for swinging movement relative to said pin
ln the middle guide arm 335 shown in FIGURE 9, the
engaging means perpendicular to said >drafting field to
supporting portion 49 is constructed in the form of an ad
displace the top roll into and out of engagement with
ditional part and is substantially U-shaped, and -rails Sil
.the associated bottom roll, and said guide arm assembly
bent out of the arms of the supporting portion 49 bear
the saddle-shaped supports comprise a guide arm assem
from the rea-r against the part of the guide arm» 335 lying
between the pivots 171 and 172, while a web 51, which
joins the two arms of the supporting portion 49, has its
including entirely self-contained bias means to urge said
top roll supports toward the associated bottom roll.
2. Textile drafting mechanism according to claim l
including stop means for limiting displacement by said
bias irneans of said guide arm assembly adjacent said top
contact with the upper portion of the guide arm 335.
roll supports.
The web 51 lies in a plane passing through the centre
3. Textile drafting mechanism according to claim l
axis of the upper pivot 17-1 so that the additional helical
said pin means comprises a pair of spaced -pins
spring only acts on the lower arm of the guide arm 335.
substantially parallel to the roll axes of said top
The spring -143 bears at one end on the lower end of the
and bottom rolls, and having their axes aligned in a plane
end face, which is curved towards the pin 171, in edge
guide arm 335 and at the other end on a seating on the
supporting portion 49. As in the foremost guide arm il
lustrated in FIGURE 9, the swinging movement is limited
by an anchor 247 with bent or twisted tabs. The guide
arm 335, the support portion 49', the spring and anchor
247, and the saddle-shaped supports comprise a guide arm
assembly having entirely self-contained bias means and
operable to swing laterally on the pins of the carrier arm
222 in the plane of the drafting field.
The arm 222 may be held in the operating position by
means of a locking device 53 (see FIGURE 9) which is
known per se, and is actuated by means of an operating
lever 52. The arm 222 is released from the operating
position by pivoting the lever 52 counteroloclcwise on its
pivot to permit the depending linli of the locking device
53 to move downwardly so that it may be disengaged from
transverse to the drafting field, said pin-engaging means
comprising at least one tongue wrapped around said pin
means and having at least one impressed rib- engaging
said pin -means to all’ord said :lateral swinging movement
parallel to said drafting ñeld.
4. Textile drafting mechanism according to claim 1
including a stirrup adjustably mounted on -said carrier
»arm and mounting said pin means therein for adjust
ment longitudinally of said carrier ar-m.
5. Textile drafting mechanism according to claim 1
wherein said bias means comprises a substantially flat
resilient arm portion mounting said pin-engaging means
at one end position and said top supports at the opposite
end portion.
6. Textile drafting mechanism according to claim 5,
including means for limiting the flexure of said resilient
arm portion.
the hook-shaped part which is mounted on the apparatus
which carries the lower rolls 16. The length of the oper
7. Textile drafting mechanism according to claim 5,
ating lever permits the upper rolls to be forced against the
a spring element, a first seat for said spring ele
lower rolls with a very high loading pressure. After the
ment on said guide arm assembly adjacent said pin-en
locking device has been released, it can be swung up and if
gaging means and an opposed seat for said spring cle
necessary secured to its upper position. Similar devices
ment on said resilient arm portion adjacent said top roll
are shown in FIGS. 4 and 6. In FIGS. 2. and 3, the lock
ing device 1tì3 may be lreleased for displacement out of
8. Textile drafting mechanism according to claim 7
hooking engagement with a retainer similar to that shown
wherein said spring consists of a leaf spring element.
in FIG. 9. To this end, the operating Alever is displaced
9. Textile drafting mechanism according to claim 7
180° counterclockwise until it abuts the free end of the
`wherein said spring consists of a helical spring element.
arm 102. Further downward pressure on the lever forces
10. Textile drafting mechanism according to claim 9,
the upper rolls 13 downwardly against the lower rol-ls .16
wherein said first seat comprises a rigid arm projecting
with suthcient pressure to unhook the device 103 and per
outwardly lfrom said guide arm assembly adjacent said
mit it to be pivoted out of the path of the retainer, for
pin-engaging elements to ovcrlie said resilient arm, said
example by the part projecting upwardly above the
helical spring being compressed between said rigid arm
pinned connection to the operating lever and arm 102.
and said resilient arm to supplement the bias of said
Thereupon, the carrier arm 102 may be pivoted upwardly
resilient arm.
on the bar 1.
ll. Textile drafting mechanism according to claim l
In order to limit the swinging of the guide arms 235
wherein said lguide arm assembly comprises »a holder
and 335 towards the rear, tongues 142 may -be pressed
having said pin-engaging means thereon, and a support
out of the stirrups and rest either directly against the
arm pivotally mounted on said holder for pivotal move
port-ion `of the guide arm lying betwen the pins as shown
ment about an axis parallel to said top roll and mounting
with arm 235 or, if the supporting portion 49 separate
said top roll supports thereon, said bias Ímeans being con
from the guide arm 335 is used, against the rail 50
lined under stress between said holder »and said support
The middle stirrup and the one adjacent to the bracket
l2. Textile drafting mechanism according to claim 11
may be adjustable in the slot in the arm 22,2, as a result
said bias meansV comprises a helical spring seat
of which the mutual distance between the top yrolls 13
ed at one end on said holder and at the other end on
said support arm to bias `said Itop roll supports toward
the associated bottom roll.
13. Textile drafting mechanism according to claim 1
wherein the guide arm assembly comprises »relatively
movable parts, said pin-engaging elements being mount
ed on one of said parts and said top` roll supports being
mounted on another of said parts, said bias «means being
confined under stress between said parts.
References Cited in the ñle of this patent
Anderson ____________ __ Aug. 14, 1956
Dausch ____________ _.. Jan. 14, 1958
294,3 08
Switzerland __________ __. Jan. 16, 1954
Hohloch ____________ __ Apr. 20, 1954
Da-usch ______________ __ Nov. 6, 1954
Dausch ____________ __ June 26, 1956
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