close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3072162

код для вставки
Jan- 8, 1963
A. c. NYGREN ETALV
3,072,152
YARN SPOOL CONTROL MECHANISM FOR LOOMS
Filed Nov. 2'7. 1959
'
3 Sheets-Sheet 1
I
Raven/"Z0749?
Amoid C. Jljgren
7175229922 A. 3'0?”
33 sum 30,112, Maw r
Jan. 8, 1963
A. c. NYGREN ETAL
3,072,152
YARN SPOOL CONTROL MECHANISM FOR LOOMS
Filed NOV. 27, 1959
3 Sheets-Sheet 2
Jan- 3, 1963
A. c. NYGREN ETAL
3,072,152
YARN SPOOL CONTROL MECHANISM FOR LOOMS
Filed Nov. 27. 1959
im
3 Sheets-Sheet 3
United States Patent @fl’iee
1
3,072,152
Patented Jan. 8, 1963
2
3,072,152
YARN SPOOL CONTRGL MEQHANHSM
FOR ‘LUUMS
Arnold C. Nygren and Warren A. Bjorn, Weilesley,
Mass, assignors to Shawmnt Engineering Company,
Boston, Mass., a corporation of Massachusetts
Filed Nov. 27, 1959, Ser. No. 855,786
2 Claims. (ll‘l. 139--7)
bracket assembly designated generally at 6, comprising a
vertical blade 7 for entering between carrier link pairs of
the chain 5, a pivoted hook~latch 8 and an upright ear 9
having at the upper end a bearing and keeper 9' for
rotatable support of the bearing pintle 3' at the adjacent
end of the yarn spool 3. These tube frame attaching or
hanger units 6 are ?xed on the tube frames 1, one at
each end, as by longitudinally projecting feet 6a, 6b, FIG.
6, inserted and secured within the hollow tubular bodies
larly Axminster looms wherein pile-forming lengths of 10 of the frames.
In weaving on Axminster looms, a large number of tube
yarns or tufts are inserted and locked at the fell of the
frames such as 1, extending across the loom parallel to
goods as woven. More speci?cally the invention concerns
the breast beam, are supported at their respective ends
the control of the spooled and rotatably supported tuft
This invention relates to pile fabric looms and particu
yarn masses in the movement thereof, with the carriers
or so-called tube-frames mounting them, through the mo~
tions of the successive weaving-in cycles conventional to
Axminster looms. It aims to accomplish more certain,
accurate and positive control of the tuft yarn spools and
hence of the lengths of tuft yarns delivered from them in
the weaving process.
In the drawings representing by way of example a pre
ferred embodiment of the invention:
FIG. 1 shows in side elevation one end of a tube frame
as presented adjacent the weaving station by the carrier
chains of a loom, with a frame-handling clutch in ap
upon the carrier chains 5, see FIG. 7, and are caused to
travel with the chains in patterned arrangement so as to
bring the individual tube frames and the particular spools
and tuft yarn supplies thereof into position adjacent the
Weaving station at the proper times. At the weaving sta
tion each tube frame 1 in turn is engaged by the tube
frame transfer mechanism 25, generally and herein called
the clutches, and by the latter bodily removed from the
carrier chains and taken down toward the warp shed so
as to present and “wipe in” the pendent tuft yarn ends Y
between the warp ends, see FIG. 8, for locking in to the
fabric by a shot of ?lling. While still carried by the
clutches the tube frame is through the clutch actuating
proach to the tube frame;
'
means lifted appropriately to draw off the desired lengths
FIG. 2 is a top plan, with parts in horizontal section,
of the tufting yarns, see FIG. 9, such lengths then being
generally corresponding to FIG. 1 upon a larger scale
cut off by the shear mechanism of the loom and the tube
and with the clutch engaging the tube frame;
30 frame returned to the carrier chains and released from
FIG. 3 is an end elevation of the mechanism of FIG. 1;
the clutches.
FIG. 4 is a view partly in plan as viewed from a position
above and to the left of FIG. 3 and partly in section as on
In the course of the travel on the loom with the carrier
chains the yarn spools 3, 4 of the tube frames 1 are cus
the line 4-4 of FIG. 3, looking angularly downward in
tomarily held against rotation, to avoid irregularity in the
the direction of the arrows;
positioning of the yarns, particularly as to the length of
yarn end projection from the yarn guide tubes 2. For
this purpose the tube frames customarily are equipped with
FIG. 5 is a vertical sectional view as on the line 5-5
of FIG. 2;
FIG. 6 is a horizontal section as on the line 6-6 of
some form of spool brake, usually bearing against the
periphery of the spool heads 4. One form of such tube
frame-carried spool brake is shown for example in FIG.
of the front or weave end of an Axminster loom illustrat
10, comprising an arcuate pad 10 supported at the free end
ing part of the path of the travel of the tube frames on
of an elongate leaf-spring 11 lying along the top of the
the carrier chains;
tube frame bar at the face thereof adjacent the mass of
FIGS. 8 and 9 are detail diagrams in vertical section
yarns on the spools. Such leaf-type brake is further
lengthwise the warp at the weaving station, FIG. 8 illus—
trating, the “Wipe-in” stage and FIG. 9 the start of the 45 shown for example in Patent No, 543,080.
Spool brakes of such leaf spring type generally remain
lift or draw-off stage;
applied to the spool heads at all times. Because of their
FIGS. 10 to 13 illustrate a modi?ed form of clutch
position at the top face of the tube frames they are not
carried brake action and control, wherein
readily accessible for mechanical release. They are sub
‘ FIG. 10 is a front elevation,
FIG. 11 a top plan partly in horizontal section, corre 50 ject to the objection that if made with sufficient braking
strength to approach adequate holding of the yarn spools
sponding to FIGS. 1 and 2,
during travel on the chains they do not permit the spools
FIG. 12 an end elevation with parts in section, and
to turn properly during draw off of the tufting yarns
FIG. 13 is a vertical cross~sectional view of the electro
during the weaving operation.
FIG. 5;
FIG. 7 is a partly schematic diagram in side elevation
magnetic brake operating device; and
FIG. 14 is a schematic wiring diagram.
Referring to the drawings in more detail, considering
?rst FIGS. 1 to 6, these represent an end portion of a
55
Another form of spool brake carried by the tube frames
is of thespring-plunger type such asherein illustrated in
the embodiment of FIGS. 1 to 6, noting particularly FIG.
tube frame 1 equipped with a row of tubes 2 for they
6. These comprise in general an arcuate shoe or pad 12
tufting yarns Y to be delivered from a mass thereof wound
on a plunger 13 housed in and projecting from the main
on a tuft yarn spool 3, one end head of which is seen at 60 bar of the tube frame 1 in vertical line with the head 4
. The illustrated portion of a tube frame 1 and the
of the supported spool. Such brake device during travel
closely associated Axminster loom parts including one tube
frame transfer clutch 25 are those at the right side of the
loom. It will be understood that corresponding oppositely
disposed parts are provided at the other side of the loom.
Each tube frame 1 is equipped with suspension means
for removably attaching it to the carrier chains of the
loom, part of one such chain being shown dotted at 5,
FIGS. 1, 3 and 5; see also FIG. 7. Any usual or preferred
form of such suspension means may be employed, that
shown by way of. example comprising the hanger or
of the frames and spools on the chains is urged into brake
applying engagement with the spool head as by a coil
spring 145 surrounding a reduced portion 13’ of the
plunger 13 and bearing between an upper collar 15 there
on and a lower collar on a sleeve guide 16 slidably re
ceiving the lower end of the plunger.
Such plunger-type spool brakes are generally more
e?icient than the leaf spring type mentioned and can be
arranged to be wholly or partially released when the
clutches take control of the frame. Thus theycan be
3,072,152
3
4
scribed. Normally, with the tube frame supported on
accorded a sut?ciently heavy braking action to hold the
the carrier chain 5 as in FIGS. 1 and 3, the spool brake
spools against turning during travel on the chains.
12 is applied to the spool and the release arm 17—20 is
Heretofore such plunger-type brakes have been oper
held up in the full-line position of FIG. 6, through the
atively associated with the pivoted latches 8 of the tube"
medium of the relatively strong coil spring 14 described.
frame suspension means 6, or otherwise arranged for
One of the transfer clutches, that for the righthand
intended release by the thrusting action of the clutches
side of the loom, is shown in each of vFIGS. 1 to 6. It
themselves attendant on engagement of the latter with
is understood that a similar but oppositely facing clutch
the tube frames.
is provided at the other or left side of the loom. The
Such manner of mechanical releasing operation of the
supporting transfer member or clutch proper previously
10
tube-frame-carried spool brakes solely by the frame con
mentioned and designated generally at 25 in all respects
tacting action of the clutches has not proven wholly re
other than herein pointed out may be of the construction
liable. This we have determined is largely due to the
and arrangement usual in the equipment of Axminster
latitude for variation in position of the frames relative
looms. Such clutch proper 25 as shown comprises a cup
to the clutches at the time of engagement by the latter,
or scoop-like element open at the top and at the inner
or other irregularity during contact of the clutches with 15 portion adjacent the end of the tube frame. It is of
the latch or other brake-connected means on the tube
general U-shape in transverse vertical section, or as
frame. Resultantly the plunger-carried brake shoe on the
viewed from the left in FIG. 1, and include a bottom wall
frame is frequently but partially released or not at all.
26 with downturned arcuate lips 26a for guiding the
In such instances the ensuing irregularity in presentation
clutch beneath the adjacent end of the tube frame, and
of the tufting yarn end lengths in the weaving operation
opposite side walls 27, 28 forming with the bottom wall
is even greater than with non-released but lighter brak
26 a receiving seat for the tube frame.
ing action of the mentioned leaf-spring type of brake.
As evident in FIG. 1, also FIGS. 5 and 6, the front
In accordance with the present invention means is pro
side wall 28 herein is recessed or of reduced height to
vided whereby the plunger-type or similar relatively strong
accommodate the mentioned actuating means 70 for re
spool brakes of the tube frames are assured of positive 25 lease of the frame-carried spool brake means. This U
release at the proper time attendant on engagement of the
form or cup-like clutch 25 further comprises a main
clutches. Further, not only are the yarn spools at such
intermediate or transverse outer wall 25a forming the
time totally relieved of braking by the brake means of
body of the clutch and having the novel control mech
the tube frames but subsequently in the course of the
to be described mounted thereon.
weaving in operation the yarn spools are not left entirely 30 anism
The described clutch 25 is operatively disposed upon
free to rotate but are rendered subject to a further brake
means apart from that on the tube frames themselves, >
and herein carried by and with the tube frame clutches.
Such further brake means is herein adapted to main
tain rotation-constraining control of the yarn spools while
in the clutches and until the return of the tube frames 1
to' the chains 5, at which time the braking means upon
the frames themselves again take charge. Further, such
supplemental but correlated spool brake is subject to ef
fective control and may be varied in strength of applica- ‘
tion at certain times, and may be released wholly or par
tially during the stages of the wiping-in (FIG. 8) or of
lifting withdrawal of the yarn frames (FIG. 9) so as to
insure uniformity of action and a constant length of draw
off of the tufting yarns with a minimum of wastage and
irregularity.
the loom in the known manner by means of a main sup~
porting stud 29, FIGS. 1, 2 and 5, rockably received at
the upper end of the usual cam-operated clutch lever (not
shown) of the loom and by which the clutch as a whole
is motivated in the weaving operation. Thus as cus
tomary the clutch is adapted to be moved in toward and
for supporting engagement with the adjacent end of a
tube frame 1, toward the left in FIG. 1, then through the
tuft-yarn presenting, wiping-in and withdrawing motions
of the weaving operation, including pivotal movement
about the clutch-supporting stud 29, and ?nally an out
ward return movement, to the right in the position of
FIG. 1, after replacing the tube frame upon the carrier
chain 5. Pivotal or rocking portions of clutch motion
are accomplished by another cam-controlled arm (not
shown) of the standard loom equipment operatively con
Accordingly, under the present invention, the spool
nected to a second or rocker post 30, FIGS. 2, 3 and 4,
brake means 12—-16 of each tube frame is equipped with
projecting longitudinally outward from the rear wall of
an externally accessible release member or ?nger 17 dis~
the clutch proper, and whereby as in the wiping-in stage,
posed within and extending outwardly through an open
FIG. 8, the clutch may be rocked about the main stud
ing 18 in a side wall of the tube frame 1, herein the wall
29 as a center.
at which the series of yarn tubes 2 is located.
In further accordance with the present invention there
In prior brake releases such for example as that of
is provided in association with such transfer clutches,
Patent 2,161,762 the brake has been engaged by a lever
and herein carried on and by them, a second and opera.
extension on the hook-latch of the frame suspension 55 tively independent spool brake means adapted to take over
means, such as latch 8 hereof. By contrast, and in ac
and apply yarn~tension rotation retarding and controlling
cordance with the present invention the brake depressor
braking pressure to the spool while the tube frame is sup
or release ?nger 17 is operatively independent of reliance
ported and manipulated by the transfer clutches. And
on mere mechanical thrusting engagement of the transfer
in this connection there is further supplied on each trans
clutch with the frame for taking it from the carrier chains. 60 fer clutch a ?rst and a second motor means, shown as of
Referring again particularly to FIG. 6, the brake re
the ?uid or hydraulic type whereby the ?rst brake means,
lease ?nger 17 herein comprises a bar having an inter
that described on the tube frame is positively released
mediate portion of apertured or yoke-like form so as to
and in timed correlation therewith the second brake means
straddle the brake plunger 13. The latter has a pin 19
upon the clutch is appropriately applied.
radially projecting at opposite sides beneath this release 65 As herein illustrated such secondary or clutch-carried
bar or ?nger 17 whereby with the brake applied the re
brake and the ?rst and second motor means are mounted
lease ?nger 17 is supported in the full-line position as in
on the mentioned body or outer wall 25a of the clutch
FIG. 6.
The inner end of this release ?nger 17 has an
upturned portion 17a whereby it is pivotally associated
, proper, as through the medium of a casting or bracket 35
best seen as a whole in FIG. 3 and comprising a gen
with an overlying ?xed wall in the tube frame, such as 70 erally rectangular attaching portion 36 and a laterally
the menttioned ear-attaching foot 612. The projecting op
projective portion 37. Such bracket as a Whole may be
posite or outer end 20 of the release ?nger 17, external
formed integrally, welded or otherwise secured to the
to the body wall of the tube frame, is accessible for
clutch proper and is provided with apertures for threaded
positive down-thrusting engagement by a motor-actuated
element 70 associated with the transfer clutch to be de
reception of the mentioned supporting and pivot studs
3,072,152
5
29 and 30 of the clutch proper, these latter being utilized
if desired as anchoring means for the bracket with re
spect to the clutch proper.
On the lateral portion 37 of the bracket 35 is ?xed a
yoke 38 as by screw bolts 39, FIGS. 2 and 4, for pivotal
ly mounting the mentioned clutch-carried brake means.
Noting FIGS. 2 and 4, also FIGS. 1 and 3, said means
comprises a curved brake pad 40 ?tting the rim of the
6
clutch 25 is equipped with the further hydraulic motor
device designated generally at 80, FIG. 5, for so releasing
the tube-frame-carried brake 12-13, and whereby such
brake is positively held released during the entire period
orv weaving cycle while the tube frame is held in the
clutches.
Noting particularly FIG. 5, also FIGS. 2 and 3 the
motor 30 is on and formed as a part of the clutch-attached
spool head 4. It is carried at one end of a plate 41 lon
gitudinally adjustably connected as by slot and screw con 10 casting or bracket 35 previously mentioned, being dis
posed at the outer or end face of the latter. It comprises
nection 42 to one end portion of a rigid arm 43, the other
a motor chamber 81, FIG. 5, having at the inner end a
end of which has a sleeve bearing 44 received on a pivot
sleeve guide '82 for the stem of a plunger 83 having at
pin 45 held in the yoke 38.
the outer end a head 84 centrally engaging a diaphragm
Positive power-actuating means for the clutch-carried
85 hydraulically sealed within the motor device 80 by a
brake means 40-45 is shown as a ?uid motor built into
recessed block or plate 86 a?ixed as by screw-bolts 86’.
the casting or bracket 35 and designated generally at 50.
The
diaphragm de?nes with the plate 86 a sealed chamber
Such bracket is formed with a motor chamber 51, FIG. 4,
87 for the motivating pressure ?uid. Fluid under pres
having on the wall adjacent the brake arm 43, medially
sure is admitted to said chamber power-applying side 87
of the latter, a ?anged guide bushing 52 for a motor
plunger 53 projecting outwardly through it and having a 20 of the motor 89 via a port 88 having a communicating
tubular ?tting 89 for attachment of a pressure ?uid line
reduced end operatively connected to the opposite inter
supplied from a suitable source. When ?uid pressure is
mediate part of the brake arm 43 in a manner admitting
released a coiled expansion spring 88 surrounding the
pivotal movement of the brake arm about its pivot 45
under actuation of the motor plunger 53, as by loosely
extending the plunger through the arm 43 and holding the
arm on the plunger 53 by a Washer and pin as at 54.
i The motor chamber 51 is sealed against pressure ?uid
by a ?exible diaphragm 55 held marginally between the
inner chamber wall and the mating enclosing wall of a
cap-like ?uid chamber element 56 removably anchored
in sealing relation to the diaphragm 55 as by gasketed
screws 57. The diaphragm is centrally cupped for seat
ing of the head 53' of the plunger 53. A compression
spring 58 surrounds the plunger within the chamber and
bears between the ?ange of the guide bushing 52 and
plunger guide sleeve 82 and bearing between a flange
thereon and the plunger head 84 urges the plunger 81
25 outwardly, toward the right in FIG. 5, to normal inactive
position.
This hydraulic motor 80 as illustrated is disposed for
movement of the plunger 83 thereof in a general direc
tion paralleling the tube frame 1 and the axis of the spool
3 thereon. The motor plunger 83 cooperates with the
break-releasing actuator or hold-o? actuator 70 already
mentioned.
,
Noting particularly FIG. 5, said actuator is shown as
a two-arm lever or bell-crank rockably pivoted as on a
35 stud 71 is a recess 25b of the clutch body 25a.
At the
inner portion, nearer the tube frame, it has a horizontal
projecting nose 72 overlying the frame-carried brake
plunger-actuating ?uid pressure. The ?uid-receiving
release ?nger 17-29. The other or vertical arm 73 of
chamber 56a at the power side of the motor is supplied
with pressure ?uid from a convenient source on or ad 40 the actuator 70 stands with its upper end opposite and
in position to be engaged by the motor plunger 83.
jacent the loom, said chamber having an inlet-outlet port
Spring means normally urges this rocker or actuator 70
59 with a tubular ?tting 60 for attachment of the pressure
clockwise in FIG. 5 so that the nose 72 is elevated at a
?uid conductor pipe or tubing, not shown.
level above that of the brake-release ?nger 17-20 on
The last described spool brake 40-43 and the hydraulic
the tube frame. Such spring means is shown as of the
motor means 50 therefor will be understood to be mounted
on the clutch device 25, contrasting in this respect with 45 torsion or pigtail form having the coiled intermediate por
tion 75 seated on the outer headed end of the stud 71 on
the herein earlier described brakes 12-13 on the tube
which
the actuator '70 is pivotally hung, with one extended
frames. Such clutch-carried brake 4tl-43 and its motor
end 75 of the spring attached to the arm 73 near the
50 are seen to be at the front side (toward the loom front)
free upper end thereof and the other end 77 anchored
of the body or casting 25a of the clutch 25, see particu
‘against the clutch body 25a.
the plunger head 53', for returning the plunger and brake
40 outwardly away tom the spool head on release of
larly FIGS. 1 and 3. As evident on FIG. 4 the move
ment of the plunger or actuator 53 of the hydraulic motor
From the foregoing it will be apparent that when the
loom clutches have taken over and are supporting a tube
frame
removed from the conveyor chains 5, as assumed in
return movement by the spring 58, is in a direction trans
FIGS.
2 to 6, then admission of ?uid pressure to the
,verse to the longitudinal axis of the spool frame and the
spools thereof. As previously noted, this clutch-carried 55 motor 80 will cause the plunger or piston 83 thereof to
50, for applying the brake 40 and for releasing it for
brake 40-43 is for taking over the spool-braking control
when the tube frames 1 are supportively held in or on
rock the release-actuator 7t) counterclockwise on FIG. 5
thereby to depress the release ?nger 2'9 and remove the
tube-frame-carried brake 12 from braking relative to the
‘spool head 4; see also FIG. 6. Similarly, admission of
the clutches of the loom.
In the FIGS. 1 to 6 embodiment of the invention, the
pressure ?uid to motor 50 will
loom clutches such as 25 also are equipped with other 60 thrust the clutch-carried brake cause its piston 53 to
40 into holding engage
‘motor means designated generally at 80, see particularly
ment with the spool head 4.
FIG. 5, for positively releasing the earlier-described spool
“brake devices such as 12-13 on the tube frames. As
stated, when the tube frames 1 are upon the conveyor
In operation said brake-controlling hydraulic motors 50
and 8t} upon the loom clutches 25 receive motivating pres
sure ?uid from the hydraulic system associated with the
chains 5 the holding of the spools against rotation is 65 loom, through tubing lines (not shown) connections at the
‘effected by the brake devices 12-13 carried by the tube
motor port ?ttings 6t} and 89, the ?uid pressure supply
l'frames. But when each tube frame as successively
lines to each of the motors 5t} and 80 having “on” and
‘presented at the weaving station is supportively taken over
“off” valve means therefor. Such valving may be con
'by the loom clutches it is desired that the relatively heavy
trolled either mechanically or electrically through cams
plunger-type frame~carried brakes 12-13 be released so 70 such as represented in FIG. 14 operatively disposed on
‘that the spool-controlling brake action may be taken over
the main loom cam shaft indicated at 90 in the diagram
matic FIG. 7, these cams being timed Withthe clutch
by the last described brake means 40-43 mounted on
‘the clutches.
'
’
i 1 Accordingly vin ‘the embodimentv of FIGS. bro 6 the
control cams of the loom. For the purposes of the present
disclosure it is unnecessary further to illustrate the hy
draulic system and control valving, such being of‘ the
awaits‘
known or preferred form. The separate valve-controlling
cams for the motors 5t} and S0 may be such as indicated
at 92 and 94, FIG. 14, on said main shaft 9%). In said
diagrammatic view it will be understood that the same
shaft 90 is shown at both portions of the ?gure, the cams
trolled variable braking pressure.
status at all times or may be equipped for release by‘
The controlling cams such as 92, 94 for the respective
brake-controlling motors 50 and 80 may be shaped, pro
the clutches in taking over the frame, and maybe sup‘
plemented by a plunger-type frame carried brake such as
portioned and arranged to correlate the operation of said
clutch-carried motors during each weaving cycle in such
equal lengths of the presented yarns.
‘V
In this example the tube frame 1 is shown equipped‘
with a spool brake 10 of the earlier mentioned type
carried on a leaf spring 11. It may remain in applied
92, 94 being coaxial thereon but diagrammed separately
for purposes of description.
timing as may be desired for the particular weaving opera
tion, type and character of yarns and other attendant
circumstances to afford regularity of yarn presentation and
O
c;
with an electromagnetic motor device designated gen!
erally at 1% whereby a clutch-carried brake 110 may
beapplied and released at desired times and under con
12. of FIGS. 1 to 6, with connection with the hook latch 8
for release thereby when thrust in toward the tube frame’
by the clutches in taking the frame from the chains;
see FIG. 11 and examples of such frame-carried brakes
15 associated with the tube-frame ears or latches as in
In some instances, particularly with certain yarns and
heavy yarn masses on the spool, it is preferable that both
the frame-carried brakes 12 and also the clutch-carried
brake 46 be applied during most of each weaving cycle,
Patents 2,161,761 and 2,161,762.
Braking of the spool during the weaving cycles is in
this instance effected, with different braking strength at
different times as desired, by a commercially available
electromagnetic motor unit 100 having variable torque‘.
20
so that the spools are ?rmly held while the frames are
capacity as more or less electrical energy is furnished to
being manipulated by the clutches. Then at the draw-off
it. This variable torque motor unit 100 is mounted on
stage at least one of the brakes is released, either by
activating the motor 80 to retract the frame-carried brake
12, or by deactivating the motor 50 to release the clutch
carried brake 4th, the valve control cams being formed
and timed accordingly.
In other weaving operations it is sometimes preferable
to use the two brake means alternately, as for example
when the brakes are relatively adjusted so that one of
a bracket 101 secured to the standard clutch 25 such as
previously described in connection with FIGS. 1 'to 6.
The unit comprises a magnetic coil 102 on a tubular core
1%, the core containing a rotatably supported shaft 104'~
carrying at the upper end above the coil a rotary recipro-_
cable armature plate 105. A clock spring 106 secured
at the opposite ends to the shaft 104 and a ?xed part of
the core unit such as the coil housing biases the plate
them, e.g. the frame-carried brake 12 applies a heavier
braking action than the other, e.g. the clutch-carried
.105 in one direction. At the top face of the coi‘lihousing,
brake 40. In such instances the motor-valve controlling
tial series of balls 107 disposed in inclined cam grooves
cams are constructed, arranged and timed so that both
between it and the armature plate 165 is a circumferen
168 at the underface of the plate 105 and the top face
motors 80 and 5t) are inactive, with the frame-carried 35 of the coil housing respectively. The construction and
brake 12 accordingly on and the clutch-carried brake 40
arrangement is such that when the coil is energized the
off, until the draw-off stage. Thereat both motors are
down pull exercised upon the armature plate 105 causes
activated, motor 80 accordingly releasing the frame-car
rotation of the latter by reason of the balls and inclined
lried brake 12 and motor Stl simultaneously applying the
cam grooves. The unit 100 is so installed that such rota
clutch-carried brake 4%, for a positive but relatively 40 tion is in the counter-clockwise direction looking down
lighter braking action during the draw-off. Or the brakes
upon the unit as in FIG. 11. On‘ deenergization of the
may be alternated in the opposite order, employing the
coil 102 the plate returns reversely in the opposite or
clutch-carried brake 40 for the period or periods of rela
clockwise direction under the action‘ of the spring 106.
tively heavier brake application.
Further, the structure and arrangement of the motor unit
In still other circumstances it may be desirable to
109 is such that the plate-reciprocating action or torque
release both brakes momentarily in connection with the 45 is greater or less in proportion to the amount of elec
draw-off operation or a portion thereof. This may be
trical energy supplied.
accomplished by adjusting and timing the cams to deac
The electromagnetic motor unit 100 acts upon a clutch
tivate the motor 50 and thereby relieve the clutch-carried _ carried brake pad 111 on a ?nger 112 extending from
brake 45 and at the same time to activate the previously
a forked arm 113 pivoted on a post 114 on the motor
inactive motor 31) thereby to depress the actuator '70 for 50 mounted arm 104 of the clutch 25. The forked end 113’
taking off the frame-carried brake 12. For such latter
of the arm 113 straddles a crank pin 109 on the torque
set-up the cams would be approximately as diagrammed
plate
105.
' l
i
on FIG. 14, assuming them to be operating mechanically
Noting particularly FIG. 11 wherein the brake 110 is
or otherwise on the motor-controlling hydraulic valves
shown in full line in applied position, the unit‘ 100 is as
as described in connection. with FIGS. 1 to 6 instead of 55 sumed to have been energized, so that it has turned in
working upon switches of the electromagnetic variable
the counter-clockwise direction as indicated by the arrow
power brake unit of FIGS. 10 to 13 to be described. Thus
thereby swinging the forked end 113’ of the arm 113 in
assuming that cam 92 of FIG. 14 controls the valve for
the brake-applying direction, i.e. clockwise with reference
the motor 89, and being at a dwell portion as shown it
to
the pivot at the post 114. Upon de-energizing of the
has deenergized the motor 50 and released the clutch 60 motor unit 100 the coil spring reversely returns the-plate
carried brake 4%; simultaneously cam 94 being at a rise
and the arm 113, moving the brake 111 to the dotted line
portion has activated the motor 89 thereby also to release
off position.
the frame-carried brake 12.
As stated the force of the braking ‘action applied by
Thus it will be understood that through appropriate
the electromagnetic motor unit 100 is proportionate to
formation and timing adjustment of the hydraulic motor
the energy furnished to it. This in turn is controllable
valve control cams any desired on and off positions of the
as by a rheostat 120, FIG. 14, adapted to be placed in
two brakes relative to each other may be obtained for
serial circuit with the motor 100 thereby to reduce the
any desired periods in each weaving cycle. It is noted
energy or alternatively to be cut-out from the motor cir
that whatever be the order and timing of the braking
cuit with corresponding increase of the activating energy
operations, the actions of application of the clutch-car
ried brake such as ‘it? and of release of the frame-carried
brake such as 12 are positive, under powered actuation
supplied.
In the wiring diagram FIG. 14 two alternative- circuits
to the motor unit 100 are represented. One of them, at
by the hydraulic motor means 50 and 89 respectively.
the right of the diagram, is closed or opened by the
In the further embodiment of FIGS. 10 to 13, and
switch 125 as controlled by the loom cam shaft carried
FIG- 14 as I?l?ted thereto, the clutch 25 is equipped 75
3,072,152
With this circuit closed
at switch 125 as shown the rheostat 120 is connected in
series with the motor, hence receives relatively lesser
energy and applies relatively light braking torque to the
may be dispensed
rake 1-11. In the other circuit, at the left in FIG. 14,
and containing the switch 126
'
contact arm for greater or less resistance left to the
closure of the switch 126 and attendant opening of the
manual operation by the weaver as circumstances dictate.
Our invention is not limited to the particular embodi
ments thereof illustrated and described herein, and we set
forth its scope in our following claims.
We claim:
‘
l. Yarn spool control means for Axminster looms hav~
period of each weaving cycle and to shift as between rela
ing carrier chains, tube frames thereon rotatably mount
ing spools of tufting yarns, and transfer clutches for taking
the frames from the chains, moving them for yarn pres
15
entation and returning them to the chains, said control
means comprising
tively heavy braking action and a relatively lighter bral<~
a ?rst spool brake means on the tube frames for en
ing action in accordance with the closing or opening of
the switches 125, 126, it being further understood that if 20
gaging a given area of the head of a spool thereon
for holding the spool against rotation while the frame
is on the carrier chains,
a second spool brake means associated with at least
The electromagnetic brake means of FIGS. 10 to 13 is
readily adaptable for automatic adjustment of the degree
of braking e?ort applied as the yarn packages or masses 25
upon the spools 3 become depleted in the course of an
extended weaving operation. With the decreasing yarn
supplies and attendant decreasing inertia of the spools the
latter tend to run more freely; also with the decreasing
diameter of the package a larger angle of turn of the spools 30
is needed for draw-off of a given length of the yarns.
Accordingly it is desirable from time to time in the course
of an extended weaving operation to modify the braking
effort, usually to decrease it to compensate for the package
reduction. In FIG. 14 means for this purpose is sche
matically shown. The carrier chains 5, a portion of which
is shown passing about a lower sprocket 5a adjacent the
weaving station is provided at substantially spaced inter
with a ratchet 40
wheel 122 having the rheostat contact ?nger 123 ?xed for
angular movement thereto. Each lug 5x of the carrier
chains 5 is thus adapted to step the ratchet wheel 122 one
one of the transfer clutches for application of holding
action on such spool by engagement with another
area of the spool head when the tube frame is held by
said clutches,
and externally-powered motor means on the corre
sponding clutch to control application of said second
brake means and for effecting release thereof for
return of the tube frame to the carrier chains, said
control means including a brake-releasing actuator
movably mounted on a clutch which has the second
brake means associated with it, said actuator adapted
for releasing engagement with the ?rst spool brake
means when the clutch takes a tube frame from the
chains, and externally-powered motor means on the
clutch to move said actuator for positively effecting
release of said ?rst spool brake means in the taking
over of the tube frame by the clutch.
2. Yarn control means according to claim 1 wherein
said motor means for the ?rst spool brake means is pres
sure-?uid operated.
notch and with it to correspondingly move the rheostat
?nger £23 to reduce the amount of resistance actively in 45
the circuit. Similar automatic reduction of braking
strength may be afforded in conjunction with the hy
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,345,334
2,915,090
Fletcher et al __________ __ Mar. 28, 1955
Parsons et a1 ____________ __ Dec. 1, 1959
678,219
716,760
Great Britain _________ __ Aug. 27, 1952
Great Britain __________ __ Oct. 13, 1954
of the ?uid pressure regulating type or if preferred the
brake-reducing adjustment may be performed manually
by the weaver as for example one or more times in the
FOREIGN PATENTS
50
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 106 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа