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Патент USA US2412477

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Dec. 10, 1946.
2,412,477
v. F. SEPAVICH
PULLOVER SHAFT DRIVE FOR'AXMINSVTER LOOMS
Filed Jan. 19, 1946
‘
‘MIG-DIM‘(52-)’
,
2 Sheets-Sheet 1
5-9-61.“ VIIIIIIIIGI-Y-W
.
INVENTOR
VICTOR F. 5'EPAVIOH.
_FIE. if
gem/nMe-j
ATTORNEY
Deco 10, 1946.
I
v. F. SEPAVICH
’
2,412,477
PULLOVER SHAFT DRIVE FOR, AXMINSTER LOOMS
Filed Jan. 19, 1946
2 Sheets-Sheet 2'
'
INVENTOR
v/c: TOR r‘. SEPA wow
FIG. 1
ATTORNEY
Patented Dec. 10, 1946
2,412,477‘
UNITED STATES PATENT OFFICE
2,412,477
PULL-OVER SHAFT DRIVE FOR. AXMINSTER
LOOMS
Victor F. Sepavich, Worcester, Mass, assignor to
Crompton & Knowles Loom Works, Worcester,
Mass, a corporation of Massachusetts
Application January 19, 1946, Serial No. 642,294
17 Claims.
1
(01. 139-7)
2
This invention relates to improvements in AX
minster looms and it is the general object of the
invention to provide improved means for oper
The fabric F leads forwardly from the Warp
threads W which de?ne the shed for the Weft
needle N. The tube frame conveyor system des
ating the pullover shaft by which the tube frames
ignated generally at C is supported by an over
are moved one by one to transfer position.
5 head structure including horizontal runs [5 and
Axminster looms ordinarily operate with a
IS on which are mounted sprockets 57 around
tube frame conveyor system Which is advanced
which extend the endless tube frame transport
in part at least by a pullover shaft operated
ing chains l8 and I9. Tube frames 29 extend
by a pawl and ratchet mechanism. Because of
between the chains and are provided in the usual
the nature of the pawl and ratchet mechanism
manner with spools 2 l to supply the tuft yarn 22.
it has been necessary in the past to employ very
At each side of the loom there is located a
strong brakes which of themselves impose a
transferrer arm for detaching the tube frames
considerable load on the moving means for the
one at a time from the chains and moving them
conveyor system.
toward cloth forming position. In Fig. 1 the
It is an important object of my present in
right hand transfer arm is indicated at 2'5 and
vention to eliminate the pawl and ratchet feed
a rocking rod 25 is provided to give the tube
mechanism for the pullover shaft and in its place
frame its usual rolling-in motions. Rod 26 is
substitute motor driven mechanism geared to
operated by a lever 2'! and link 28 connected to
the shaft. The motor is caused to operate dur~
a lever 29 positioned for cooperation with a cam
ing that part of the cycle of the loom in which
30 on the loom shaft 3L Rising and falling
the pullover shaft is moved angularly, after which
movements of the transfer arm are effected by
the motor serves as a lock to hold the pullover
rod 32, lever 33 and a second cam 34 on shaft 3!.
shaft stationary. The motor alternately turns
The lay L and weft needle N have operative
the pullover shaft and then locks it electromag
movements every beat or pick of the loom.
netically. This result I accomplish by using a
In operation of the loom, and assuming that
motor having a wound rotor the windings of
three-shot Axminster fabric is being woven, the
which are connected together when the shaft .is
bottom shaft 3! will rotate once every third
to be turned, and are then connected directly to
the power lines which feed the stator when the
shaft is to be locked.
In addition to the motor drive for the shaft I
beat of the lay L, and the needle N will be in
serted into the Warp shed each beat or pick of
may also use a second motor for the conveyor
system and control it simultaneously with and
in the same manner as the shaft motor is con
trolled.
With these and other objects in View which
will appear as the description proceeds, my in
vention resides in the combination and arrange
ment of parts hereinafter described and set forth.
In the accompanying drawings, wherein a con- k
venient embodiment of my invention is set forth,
Fig. 1 is a partial side elevation of an Ax
minster loom having my invention applied
thereto,
the loom. During the tuft forming operation the
transfer arms will detach the tube frame in trans
fer position from the chain, move it down to
cloth forming position, roll the tube frame, and
then lift the frame a slight distance to pull off
yarn for the next tuft forming operation. The
cutter blades l l and I2 then sever the tufts from
the tube frame and the transferrer arms there
after move upwardly to return the tube frame to
the chain. This tuft forming operation will oc
cur every third pick of the loom, and when it is
completed the transporting conveyor system will
advance to move the next tube frame to trans~
fer position.
Advance movement of the chains is e?ected
Fig. 2 is a detailed front elevation looking in 45 by means of a pullover shaft 40 which is jour
the direction of arrow 2, Fig. 1,
naled for rotation in stands secured to the upper
Fig. 3 is an enlarged front elevation looking
part of the loom frame and one of which is
in the direction of arrow 3, Fig. 1, showing the
shown at M. Each end of the pullover shaft
switching mechanism for the motor,
Fig. 4 is a detailed vertical section on line ll—4
of Fig. 3,
Fig. 5 is a side elevation looking in the direc
tion of arrow 5, Fig. 3, parts being in section,
Fig. 6 is a vertical section on line 6—5 of Fig.
5, and
-
Fig. '7 is a diagrammatic View showing the mo
tor controlling circuits.
Referring particularly to Fig. 1, the frame of
the loom is indicated at I0 and the front and
back tuft cutter knives at l l and 12, respectively.
has secured thereto a sprocket wheel similar to
that shown at 42 in Fig, l for moving the con
veyor chains.
Except for certain features of the pullover
shaft pointed out hereinafter the matter thus far
described is constructed and operated in the
usual manner.
In carrying my present invention into effect I
provide separate motor means for rocking the
pullover shaft 4% prior to a tuft forming oper
ation and then holding it or locking it electro
magnetically in stationary position during the
2,412,477
3
tufting operation. Accordingly, a motor M of
the wound'rotor alternating current type having
three windings a, b and c is mounted on a bracket
45 secured to the loom frame and has a pinion
45 meshing with a gear ill’ rotatable on a sta
tionary stud 48 supported by the bracket 45. A
second pinion £19 fast with gear 4'! meshes with
a second gear 59 which is secured to the pull
over shaft iii. The reduction gearing between.
the motor and shaft llil is such that a given nume- -
ber of rotations of the motor produces the re
quired angular motion of the: shaft. to. move. a
new tubeframe to transfer position.
The shaft 3! has secured thereto the switch
ing devices for controlling the motor M. These
switch devices are designated at I, II and III
and; since they are alike only one of: them will be
described‘ in detail.
A disk 6.9‘ of electric current conducting ma
terial is secured to a bushing Bl made of insulat
ing material and pinned as at 62 to the shaft
3! so that the disk ESQ-is insulated from the shaft.
‘
a
'
‘
“
4
ings, and this in turn is determined by the posi
tion‘» of arms 73.
Under these conditions the rotor will turn so
long as the shaft 3| is in position to keep brushes
Si in contact with strips ‘66, and motor M will act
through its. reduction gearing to turn the pull
over shaft‘. Contact strip 65 is of such length that
the pullover shaft will be turned the proper
amount ‘to-advance the next tube frame to trans
fer: position.
As the shafts 3i‘ and 46 turn together the
brushes 8|. will eventually leave the contacts 66
and the windings are no longer connected to
each‘ other through shaft 35. Brushes M will
then engage the periphery of the disks 68, where
upon the windings of the rotor will'be' connected
through their Wires 85, 85' and 8? to the’ disks:
6% and brushes 951‘ to power wires NH, 1G2. and»:
W3. Under this condition the’ windings a, bland
c are connected directly across the» same feed
curedv thereto an arcua-te peripheral plate 65' of
electric insulating material to which is secured
an electric current conducting contact strip 65
concentric with the peripheral surface 6? of the
wires which supply the rotating ?eld: of the
stator, and the rotor will be magnetically locked‘
in a stationary position. This'locking- continues
until brushes ii again engage contacts 65. The
transfer arms operate during this period of lockL
ing and assurance is given that the tube- frame
will be properly returned to its chains‘ after the
disk. ' The‘contact strip'?'d is therefore insulated
tuft forming operation.
The disk‘ hasv molded therein or- otherwise se
The speed of the rotor will be determined by
from the disk but is secured to it and turns-with:
30 the amount of resistance which is inrseriesiwith
it.
its winding and in order that this speed‘ may be
Disposed laterally on the disk 60 is a resistor
accurately adjusted the contact. ar-ms ‘iii-are made
element ‘iii mounted on an insulating arcuate
base ‘H secured to the disk ‘(it as at '12. A con
tact arm ‘ll-f3 is positioned, for engagement with
the’resistor and is- held‘in adjusted angular posi
tion on and in electric contact with the shaft 3|
by a- clamping set screw 15. The» resistor lilris
electrically connected tocontact strip 66 by wire
or conducton it‘ so that brush 8!. is connected
angularly adjustable as already described; The
gear reduction between the motor M and’ the‘
pullover shaft is so proportioned and related to
the rate of turning of, the motor that the period‘
of contact between the brushes 8i and the con
tact strip 65 will be just sufficient to cause the
aforesaid given number of revolutions of the mo‘
through part of the resistor to shaft 3 l. whenever 40 tor and give the pullover shaft its requisite
the brush engages contact 56.
Extending parallel to the shaft 3| is a rod- 80‘
held in fixed position on the loom and support~
ing a brush 35 for engagement with the periph- '
ery 6'3’ of the disk 59v and the contact strip: 65.
An- insulated, holder 32- for the brush is. secured
to rod 80 and keeps the latter out of electric
connection with the brush. The brushes 8! of
the. units‘ I, II and III are connected by wires
85, 8t and‘ Sito the- three windingsa, b and-c,
respectively,. of the rotor R of the motor’ M.
Each unit includes a holder 90. clamped to rod
80 by a screw 9!- and- provided with a shank- 92.,
made of insulating material and holding a: support 93 for a brush as which is in: continuous
electric. contact with the left side of disk til, see
Figs. 3 and 6. The brushes Ski» of the units I; II
and III are connected by wires 95, 96 and 91; re
spectively to'the main power lines i?l, m2 and
H13‘ which supply three phase alternating elec
tric current.
amount of angular movement to move the next.
tube frame into transfer position.
As already mentioned, the conveyor system C
can if desired bev driven by a motor additionalto
that provided for the pullover shaft. Such a mo
tor is shown at M’ in Fig. l. together'with ap
propriate gearing for driving. the chains !8 and
i9. The motor M’ is similar to motor M and is
mounted on a stand, HE‘ forming part of the:
overhead mechanism l5 and has a pinion. l-ll'
meshing with a gear H2. rotatable on a bearing
H3. A second pinion iléi rotating with’ gear H2
meshes with a. gear H5 securedto a shaft HB
rotating in bearings l H on the’ structure 15.
sprockets I Hi similar to sprockets Q2. are secured
to shaft H6 and advance the chains whenzmotor
M’ runs.
The gear reductionsare the same 111
each case, so that whenever motors M and. M’
run simultaneously the chains will be fed: con~~
tinuously by power supplied to them at two
spaced points.
In Fig. 7' the rotor R’ of the motor M’ is-pro
Referring, to Fig. '7 and assuming that the
vided with windings a’, b’ and c’ which are conloom has-reached a position where it is necessary
nected by wires I29, I21. and l-ZZ to wiresii?, 8t.
to start~ an angular movement of the pullover 65 and 87, respectively. By. these: connections the
shaft, shaft 3i will have turned to a position such
rotors of the two motors are always in thesame
that brushes 8| will contact the strips 55. Wind
ing alwillthen. be connected by wire 85 and its
condition so that when the pullover shaft is being
br-ush?i through that partfof the corresponding
its part of the conveyor system, and when, the
rotor of motor M is magnetically locked there
will be‘a similar. locking of the rotorR’. Con
duits I25 and I25 are provided to hold‘-wires.con-
resistor 'lil between conductor T6 and arm 13 to
shafts! . Similarly, windings b and 0 will also be
connected to shaft 3!, and since all the windings
are.‘ thus connected together the rotor will turn.
The rate of turning will be determined by the
amount of resistors it in circuit with their wind
moved by motor M, the. motorv l ' will advance
necting the motors with. the switching uni-ts; I
wish it to be understood, however, that I am not
75 restricted in thepractice of my invention to the
2,412,477
5
use of the second motor M’, nor am I to be lim
constitute an electromagnetic lock preventing
ited to the particular showing of the overhead
' motion of said rotor and said part of said system.
4. In an Axminster loom having a tube frame
mechanism as set forth in Fig. 1.
From the foregoing it will be seen that I have
provided an electric motor connected to the pull
over shaft of an Axminster loom and controlled
transporting system part of which has periods
of activity for advancing tube frames alternat
ing with periods of inactivity during which the
in such manner that the motor alternately turns
tube frames are detached one at a time from
and electromagnetically locks the pullover shaft.
the system, a multiphase alternating current
This result is obtained by using a wound rotor
electric motor having a rotor capable of turn
and connecting its windings together preferably 10 ing and also capable of being electromagnetically
through speed regulating resistance means to
locked against turning, and control means for
cause turning of the rotor when the pullover
said motor causing said rotor to turn to cause
shaft is .to be turned, and then connecting the
said part of the system to have periods of activity
windings directly to the same line which feeds
and causing said rotor to be electromagnetically
the stator of the motor so that the rotor is elec
locked during said periods of inactivity.
tromagnetically locked against turning.
Any
5. In an Axminster loom having a tube frame
slight angular shift between the rotor and the
stator during the locking period will be greatly
minimized by the reduction gearing between the
motor, and the pullover shaft and the conveyor
chains will be held in correct position for registry
transporting system part of which has periods
of activity for advancing tube frames alter
nating with periods of inactivity during which
the tube frames are detached one at a time from
the system for a tuft forming operation, a pull
over shaft geared to said system, an electric
motor operatively connected to the shaft in such
manner that the shaft and motor turn together
and are at rest together, said motor capable of
with the tube frames when the latter are returned
to the chains subsequent to a tuft forming opera
tion. Also, an additional motor M’ similar to
motor M may be used to drive the chains at points
spaced from the pullover shaft. I do not claim
the broad feature of two motors to drive the
conveyor system except as these motors alter
nately move and electromagnetically lock the
system.
being electromagnetically locked against turning
to hold said shaft stationary, and control means
for the motor causing the latter to run to cause
said part of the system to have said periods of
30 activity and causing said motor to be electro
Having thus described my invention it will
be seen that changes and modi?cations may be
made therein by those skilled in the art without
departing from the spirit and scope of the inven
tion and I do not wish to be limited to the details
herein disclosed, but what I claim is:
magnetically locked during said periods of in~
activity.
6. In an Axminster loom having a tube frame
transporting system part of which has periods of
activity for advancing tube frames alternating
with periods of inactivity during which the tube
1. In an Axminster loom having a tube frame
transporting system part of which has periods
of activity for advancing tube frames alternat
ing with periods of inactivity during which the
frames are detached one at a time from the sys—
tem for a tuft forming operation, a pullover
in)
tube frames are detached one at a time from the
system, a part moving in timed relation with the
loom, an electric motor operatively connected to
also capable of being electromagnetically locked,
said part of the transporting system, and electric
and control means for the motor causing the
latter to run to turn said shaft during said pe
riods of activity and effective to lock said motor
control means for the motor operated by said sec
ond named part and causing said motor to run to
cause said system to have said periods of activity
and causing said motor to stop to cause said sys
electromagnetically against turning during said
periods of inactivity to prevent turning of the
tem to have said periods of inactivity.
2. In an Axminster loom having a tube frame
transporting system part of which has periods
of activity for advancing tube frames alternat
ing with periods of inactivity during which the
shaft for said system to be turned during said
periods of activity and to be held at rest during
said periods of inactivity, an electric motor
geared to said shaft and capable of running and
u (l
shaft.
7. In an Axminster loom having a tube frame
transporting system part of which has periods
of motion for advancing tube frames alternating
with periods of rest during Which the tube
tube frames are detached one at a time from the
frames are detached one at a time from the sys
system, an electric motor operatively connected
to said part of said system and constructed to be
capable of running or being electromagnetically
locked against motion, and control means caus
tem for a tuft forming operation, a multiphase
electric motor provided with a stator connected
to a source of multiphase electric power, a rotor
for the motor having windings and operatively
ing said motor to run to cause said system to
connected to said system, and control means for
have said periods of activity and causing said
motor to be electromagnetically locked against
motion during said periods of inactivity.
said windings effective during said periods of
motion to connect said windings together to
cause turning of the rotor and effective during
said periods of rest to connect said windings to
3. In an Axminster loom having a tube frame
transporting system part of which has periods
of activity for advancing tube frames alternat
ing with periods of inactivity during which the
tube frames are detached one at a time from the
said source of multiphase electric power and
j cause the rotor to be electromagnetically locked
against turning.
8. In an Axminster loom having a tube frame
system, an alternating current motor having a
transporting system having periods of motion
stator and a rotor provided with windings and
alternating with periods of rest, a multiphase
operatively connected to said part of the system, 1, electric motor having a stator connected to a
and electric control means for said windings ef
multiphase source of electric power, a rotor for
fective to cause the rotor to turn to cause said
the motor operatively connected to said system
system to have said periods of activity and effec
and having windings, and control means for
tive during said periods of inactivity to cause
said windings to connect the latter together to
said windings to cooperate with the stator and
cause turning of the rotor for periods corre
2,412,477
spending to said periods of motion and also ef
fective to connect said windings to said source
8
operative under one conditionto :run and ‘cause
of multiphase electric power for periods corre
sponding ‘to said periods of rest to lock said
said shaft to turn and operative under another
condition to be electromagnetically locked ‘to
prevent turning of the ‘shaft, and electric .con
rotor electromagnetically and prevent move
trol means for said motor e?ective between suc
cessive tuft forming intervals during loom ‘oper
ation toecause said motor to be under said one
transporting system having alternating periods
condition and effective during said interval to
of'motion and rest, a multiphase alternating cur
cause said motor to be under the other of said
rentelectric motor operatively connected to the 10 conditions to prevent movement of the shaft
said system in such manner as to be required to
during tuft forming intervals.
turn during said ‘periods of motion and being
14,.111 an Axminster loom having a pullover
required to beat rest during said periods of rest,
shaft to move tube frames one at a time to ‘trans
said motor being so constructed that it can be
fer position, said shaft requiring a given angular
caused either to run or ‘be electromagnetically
movement to move .a tube frame adjacent to
locked against running, and control means for
transfer position into transfer position, an elec
said-motor causing the latter to run to effect said
tric motor operative alternately to turn and stop
periods of motion of the system and also cause
turning of said shaft, resistance means connected
said motor -to be electromagnetica'lly locked
to said motor when the latter "is turning said
against motion to effect said periods of rest of
shaft, and means to vary said resistance means
said system.
to cause an amount of turning of said motor
10. In an Axminster loom operating with a
which will produce said given angular movement
pullover shaft to move tube frames one at a time
of the shaft.
to transfer position, unitary means operatively
15. In an Axminster loom having an operating
connected to said shaft in such manner as to be 25 shaft which turns continuously during loom op
capable of alternately moving and locking said
eration and having a pullover shaft to have in
shaft, said unitary means comprising an electric
termittent periods of angular motion to move
motor capable in one condition of running and
tube frames one at a time to transfer position,
capable in another condition of being electro
an electric motor operatively connected to the
magnetically locked, and means controlling the 30 pullover shaft, and control means moved by the
motor and causing the latter to be under said
operating shaft and causing said motor to have
conditions alternately.
intermittent periods of operation to cause said
.11. In an Axminster loom having a pullover
pullover shaft to have said intermittent periods
shaft to move tube ‘frames one at a time to trans
of angular movement.
fer position, unitary means for alternately mov 35
16. In an Axminster loom having an operating
ing and locking said shaft including an electric
shaft which runs continuously during loom oper
motor capable of running in one condition and
ation and having a pullover shaft having inter
capable of being electromagnetically locked
mittent periods of angular movement to move
ment of said system.
-
'
9.111 an Axminster loom having a tube frame
against motion in another condition, driving
tube frames one at a time to transfer position, an
gearing between the motor and the shaft caus
ing the latter to move when the motor runs and
be locked against motion when the motor is elec
over shaft to cause angular movement of the
tromagnetically locked, and electric control
means for the motor operative during loom opera
tion to cause said motor to be ?rst under one of
said conditions and then under the other of said
conditions.
12. In an Axminster loom having a pullover
shaft to move tube frames one at a time to trans
fer position, transfermeans to move a tube frame -
electric motor operatively connected to the pull
latter when the motor is running, and control
means for said motor moving with the operat
ing shaft and effective to cause the motor to run
for a given part of a rotation of the operating
shaft corresponding to a period of angular move
ment of said pullover shaft and effective to pre
vent turning of the motor for the remainder of
said rotation of the operating shaft.
17. In an Axminster loom having an operating
away from the shaft and then return‘ the tube
shaft which completes a, rotation in a cycle com
frame to transfer position during a tuft forming
prising a plurality of beats of the loom and in
intervai, an electric motor ,operatively connected
cluding a tuft forming period, a pullover shaft to
to said shaft and capable of being under two con
move tube frames one at a time to transfer posi
ditions in one of which said motor runs to turn
tion between tuft forming periods, unitary means
the-shaft'and in the other condition of which the
including a motor operative to'turn said pullover
motor is electromagnetically locked to prevent
shaft when the motor is under one condition, said
turning of the shaft, and electric control means
motor when under anothercondition ‘being elec
for the motor causing the latter to be under said
tromagnetically locked to prevent turning'of the
one condition'between said tuft forming intervals 60 pullover shaft,
control means moving with
and be under said other condition during‘ said
the operating shaft and effective during a part of
tuft forming condition.
'
13. ‘In an Axminster loom having‘ a pullover
shaft to move tube frames oneat a time to trans
fer position, transfer means operative during a
tuft forming interval of loom operation to move
a tube frame away from transfer position to tuft
forming position and then return the tube frame
to transfer position, unitary means for alter
nately turning said shaft and lockingsaid shaft
against turning and including an electric motor
a rotation of the latter to cause said motor to be
under said one condition between tuft forming
periods, and effective during the remainder of
the rotation of said operating shaft to cause said
motor to be under the other of said conditions
during a tuft forming operation to enable the
electromagnetically locked motor to prevent
movement of the pullover shaft when a tube
frame is in transfer position.
VICTOR F. SEPAVICH.
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