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Патент USA US3076625

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Feb. 5, 1963
R. L. couuoné
33761615v
mu- m‘ comer. FOR TEZTIlE mmmmsr
Filed March 17, 1961
‘
‘
'
Shawn-Sheet 1
INVEN TOR.
u/POBERTL Co/v/vo/es,
#T'TOENEYS.
Feb. 5, 1963
R. L... CONNORS
wm
W. w m
$026,615
common FOR TEXTILE‘
m
5 Shaw-Sheen,‘ z
at
}
INVENTOR.
?’gfzer Z‘. Co/wvo/es
/@ z ‘[1224 94 M
ATTORNEY-5.
Feb. 5, 1963
R. |_. CONNORS
3,076,515
WARP BEAM con'mor. FOR TEXTILE MACHINES
Filed March 17, 1961
_
3 Sheets-Sheet 3
~ ?gggerl. Comm/Q5
Ari-claws vs
Q6
Patented Feb. 5, 1963
2
variations in the kind and quality of cloth which is pro
3,076,615
duced. These variations may appear as visible shade
WARP BEAM CQNTROL FOR TEXTILE MACHXNES
marks in the fabric and in any event manifest themselves
Robert L. Connors, Tonawanda, N.Y., assignor to Van
in variations in “runner length.” This latter characteris
Raalte Company, Inc, North 'l‘onawanda, NJY.
tic is well understood in the knitting industry and meas
Filed Mar. 17, 1961, Ser. No. 96,572
ures the number of inches of yarn consumed in making
8 Claims. (Cl. 242-455)
a given number of stitches.
Variations in “runner length” are so prevalent under
This invention relates to motion control means and
present conditions in the knitting industry as to be ac
particularly to combined tensioning and feed control
means for continuous strands or strips of material such as 10 cepted as a necessary evil. The accuracy and uniformity
of yarn tension in employing the apparatus and methods
in feeding warp threads to a textile machine.
of the present invention are such that “runner length”
The principles of the present invention will be discussed
herein as the same may be embodied in driving and con
may be held so accurately as to require no attention from
beginning to end of a warp beam. Furthermore, this
trolling the rotation of warp beams or Warp spools of
tricot knitting machines to control the tension of the 15 constancy may be held to at various tension adjustments
so that “runner length” may be initially selected by a pre
numerous warp threads passing from a warp beam or
determined tension adjustment and continuously uniform
spool to the knitting mechanism, such threads being some
results will follow automatically.
times referred to collectively as the yarn sheet. As will
Besides producing ‘fabric of better quality, the present
appear from the following discussion of this particular
invention avoids wastage due to production of imperfect
adaptation of the principles of the present invention, the
fabric and effects substantial savings in laborbecause
conditions under which warp thread feeding operations
of the considerable reduction in attention required with
are accomplished present peculiar control problems which
knitting machines employing the present warp beam and
may be present to a greater or lesser extent in other tex
tension control. Also, maintenance costs are reduced
tile machines and in other industrial ?lament, strand,
strip or sheet feeding.
25 which effects savings in labor costs.
Several embodiments of the principles of the present
A primary consideration in warp knitting machines is
invention are illustrated in the accompanying drawings
the constant feeding of yarn from the warp beam to the
and described in detail in the following speci?cation.
knitting mechanism at a uniform speed and under con
However, it is to be understood that such embodiments
stant tension despite the constantly changing beam diam
eter, as the yarn unwinds therefrom; the intermittent and
uneven manner in which the knitting mechanism takes
are set forth by way of example and to illustrate the
principles of the invention. The spirit and scope of the
invention is not limited to the exemplary embodiments
up the yarn in the knitting cycle; and other factors which
thus shown nor otherwise than as de?ned in the ap
tend to vary the relative speed of the warp beam and the
pended claims.
tension of the yarn passing to the knitting mechanism.
In the drawings:
In knitting machines generally and in tricot warp knit 35
ting machines particularly the knitting elements pull the
. FIG. 1 is a fragmentary side elevational view of por
yarn from the warp in an intermittent and somewhat
trons of a tricot knitting machine, illustrating one form
of the waip feed and tensioning regulating means of the
present invention in somewhat schematic form;
FIG. 2 is a fragmentary view of a portion of the struc
ture of FIG. 1 on an enlarged scale, illustrating the con
tact adjusting means thereof:
FIG. 3 is a diagrammatic view of a modi?ed form of
erratic fashion. Considering a single stitch, the knitting
motion involves pulling the yarn from the warp in about
live or six intermittent increments during each stitch, and
even these increments are not uniform so that the result
ant oscillations are not of uniform amplitude.
A tension bar normally bears yieldably against the yarn
the electrical portion of the control means of the present
ting mechanism and this tension bar, or its equivalent, 45 invention; and
sheet as it passes between the warp beam and the knit
thus oscillates rapidly since the yarn comes from the warp
beam at a substantially continuous rate and is thus con—
sumed at the knitting mechanism by intermittent incre
ments and at an irregular rate.
FIG. 4 is a diagrammatic view .of a further modi?ed
form of such electrical portion.
_ PEG. 1 illustrates an embodiment of the present inven
tionin a simple rudimentary form which is satisfactory
This oscillation, while it is of quite small amplitude, is 50 Within certain limitations or under certain conditions
and aptly illustrates the basic principles of the invention.
However, it is difficult and not entirely practical under
all conditions to make and break circuits carrying large
currents very rapidly, and accordingly the systems illus
may oscillate as fast as 6,000 times per minute. In Sim
of considerable frequency since it is perhaps ?ve or six
times the rpm. of the knitting machine which varies
from about 400 to 1,000 r.-p.m. so that the tension bar
plex machines there are two stitches per rotation of the 55 trated in FIGS. 2 and 3 are highly advantageous and may
be successfully employed throughout a widely varying
cam shaft so that this frequency is perhaps twelve times
range of the various operating conditions and require
cam shaft speed in such machines. Under ordinary cir
cumstances this oscillation or vibration substantially com
ments.
eferring to FIG. 1, the numeral 10 designates a warp
plicates the problem of maintaining constant tension and
uniform feeding speed but the system of the present in 60 beam or warp spool of a tricot knitting machine. It will
be understood by those skilled in the knitting machine
vention utilizes the oscillation of the tension means to
art that two such warp beams are normally employed but
effect accurate speed control of the warp beam or spool.
an illustration of the manner in which the control means
Among other things, the manner in which the tension
‘of the present invention operates in conjunction with
means oscillation is employed in the present system for
controlling tension and producing a uniform warp feed 65 one such Warp beam will su?ice, it being understood that
the entire tensioning and speed control arrangement may
speed is such as to substantially eliminate hunting and
be duplicated in connection with the other warp beam.
overshooting in the control adjustment means, which is
Actually certain power supply components may be com
a particularly vexatious problem in prior art warp beam
mon to two warp beam control setups merely in the inter
speed control arrangements.
In warp knitting even more than in most other textile 70 ests of economy and simpli?cation.
The warp beam ll) is mounted upon a warp shaft 5.1
producing processes, tension control is of prime import
which is mechanically driven at a variable rate from the
ance. Variations in yarn tension manifest themselves by
3,076,616
3
4
knitting machine proper, as for instance from the cam
shaft 12 thereof. The latter carries a sprocket 13 which
is connected to a sprocket 14 on a countershaft 15 by a
driving chain 16. In FIG. 1 a variable speed transmis
and constant tension, then the oscillation of the contact
sion is designated 20 and its. input and output shafts are
designated 21 and 22, respectively.
Output shaft 22 connects with a worm shaft 23 by
means of a coupling 24 and a worm 25 on worm shaft
23 drives a worm wheel 26 on warp shaft 11. Thus the
arm will be displaced so that it contacts the “tight” con
tact 45 for a longer period than it contacts the “loose”
contact, during each oscillation.
The preponderance of contact engagement will be ac
curately proportionate to the degree of deviation of the
tension rod 33 and this preponderance will produce
greater torque impulses in ?eld coil 52 than in ?eld coil
51. This produces a relatively slow rotation of motor
Warp beam 10 is rotated from and with the cam shaft 10 46, output shaft 47, and the speed adjusting shaft of the
of the knitting machine but at a variable ratio deter
variable speed transmission 26, to regulate the latter and
mined by the speed setting of variable transmission 20.
step up the speed of the warp beam to compensate for
The worm drive to the warplshaft is inherently irreversible
the aforesaid deviation, whatever the reason for such
deviation may be.
so that rotative moments of the warp shaft cannot be
transmitted to the driving means.
Means are preferably provided for adjusting the dis
15
In passing from warp beam 10 .to knitting mechanism
tance between the contacts 44 and 45 to suit various
indicated schematically at 30 in FIG. 1 the Warp threads
amplitudes of normal oscillation of the tension shaft 36
as may be encountered under different knitting condi
or Warp sheet indicated at 31 pass beneath a snub rod 32
tions. Such means may be as illustrated on a slightly
and then over a tension rod 33. As is known in the art,
the knitting mechanism 30 draws yarn from the warp 20 enlarged scale in FIG. 2 wherein the contacts 44 and 45
are pivoted as at 60 and 61 and have spring biasing arms
beam intermittently and this intermittent pull of the
knitting mechanism against the warp yarn applies an
intermittent tension to the warp yarn. Tension rod 33
62 and 63 bearing against abutments 64- and 65 to bias
the contactstoward each other but permit yieldable out~
may be resiliently mounted in various ways to apply a
ward movement when the contacts of contact arm 42
yieldable resilient tensioning force against the warp 25 bear thereagainst. An adjusting screw 67 has a cam or
wedgev formation 68 which projects between the contacts
threads. In the illustrated instance the tension rod 33
is carried at one end of laterally spaced tension arms 35
44 and 45 and determines their minimum spacing to suit
a given set of operating conditions.
Reference will now be had to the embodiment shown
The tension arms 35 are biased in a warp thread ten 30 schematically in FIG. 3 and it is to be understood that
this‘ embodiment varies from that of FIG. 1 only in the
sioning direction by compression coil springs 37 which
electrical means extending from the spaced contacts
act between extensions 38 of the tension arms and adjust
which are engaged by the contact arm designated 42
able abutment means 39 on spring rods 40. As indicated
in FIG. 1 which lead ultimately to the ?eld coils of the
above the tension arms 35 and pivot shaft 36 oscillate
under the periodic intermittent yarn pulling action of the 35 variable transmission adjusting motor 46. In the two
embodiments illustrated in FIGS. 3 and 4 separate trans
knitting mechanism. If the mean position of the arms
ducer means are utilized between the alternating contacts
and shaft can be maintained constant with a given, ten
and the adjusting motor. In FIG. 3 the transducing
sion setting of abutment means 39, then uniform warp
means comprises a thyratron trigger circuit and in FIG.
tension is. assured and this in turn re?ects a warp beam
drive which is delivering yarn at a speed synchronized 40 4 the transducing means comprises a switching reactor
control circuit.
with the speed of the knitting mechanism so that warp
In the embodiment of FIG. 3 the conductors from the
tension is rendered constant.
contacts corresponding to the contacts ‘44 and 45 of
In the embodiment of FIG. 1 this synchronization and
which are ?xed to a transversely extending tension arm
pivot shaft 36.
FIG. 1, instead of leading directly to the ‘adjusting motor
?eld windings, trigger an opposed pair of thyratron tubes
for oscillation therewith between a pair of resiliently 45 to produce the desired opposing energization of the ad
uniform tension are attained in the following manner.
A contact arm ‘42 is ?xed to tension arm pivot shaft 36
justing motor ?eld windings in the manner illustrated
mounted contacts 44 and 45. A small universal geared
schematically in FIG. 3.
.
motor 46 has an output shaft 147 which drives the speed,
As is well known in the electronic art, in a thyratron
adjustment shaft of the variable transmission unit 20 in
tube the formation of an arc and hence the conduction
one direction or the other to adjust the speed setting of
50 of current from anode to cathode is prevented by the
the latter.
shielding action of the grid when a su?icient negative
The series windings of the motor 46 are indicated
,voltage is impressed on the grid. However, if the grid
schematically in FIG. 1 wherein the armature thereof is
voltage is increased from such negative voltage to a less
designated 50 and the forward and reverse ?eld'windings
negative value or a low positive value, a critical grid'volt
‘are designated 51 and 52. Winding 51 connects with
age is reached at which conduction will start (i. e. anode
contact 44 by means of a conductor 54 and winding 52
current starts) and the tube is said to “?re,” provided
connects with contact‘ 45 by means of a conductor 55.
that the anode is positive.
When a contact is closed, the circuit is from a supply
The critical grid voltage at which trigger action begins
conductor 56 to the contact arm 42, through one of the
depends on various factors such as the electrode geom
conductors 54 or 55 and its associated ?eld winding 51
or 52, through armature-50 and back to a second supply 60 etry, anode voltage, and sometimes the temperature of
the gas in the tube. However, once conduction starts the
conductor 57.
When the'warp beam drive is “on speed” and the yarn
tension is correct for the particular setting of adjustable
grid loses further control and output continues. How
ever, with alternating current voltages conduction ceases
during the negative half of the cycle so that the grid re
abutment 39 the contact arm will oscillate between the
resilient contacts 44 and 45 and engage them for equal 65 gains control of tube output once during each alternating
time periods, thus energizing the ?eld coils 51 and 52
of adjusting motor 46 equally in opposite directions dur
ing each short cycle of oscillation of tension shaft 36.
current cycle.
In FIG. 3 the numerals 144 and 145 designate con
tacts corresponding to the loose and tight contacts 44
and 45 of the embodiment of FIG. 1 and are alternately
These rapidly successive opposing impulses cancel each 70
closed in an identical manner to that described in the
other and motor 46 remains stationary.
case of FIG. 1. The general circuitry of FIG. 3 will be
If the mean position of tension arms 35 moves toward
understood by those skilled in the electronic arts and
the “tight” side, that is, if the tension tends to increase,
need not be described in detail.
thus calling for an increase, in speed of rotation of the
In this embodiment the adjusting motor armature is
warp beam; to maintain the desired constant warp feed 75 designated 150 and the ?eld windings 151 and 152. The
3,076,615
5
' Contacts 144- and 145 are connected to the grids of thy
3% and 281, respectively. As in the preceding embodi
ratron tubes designated 16% and 161, respectively, and
ment, a variable resistor 266 in series with the motor cir
the output plates of such tubes are connected to the ?eld
windings 151 and 52 as indicated at 162 and 163, re
ment motor.
cuit 2%, 251, 252 serves as a speed control for the adjust
in FIG. 4 the numerals 2%? and 29d designate adiust~
‘ spcctivcly.
When a given contact 144 or 145 is open the negative
grid voltage is greater than the critical grid voltage and
the thyratron is thus prevented from ?ring. That is,
able current limiting or control resistors and the numerals
7397 through 3%‘ designate recti?ers which convert the
' A.C. output of the magnetic ampli?er gate windings to
direct current for the motor ?eld coils 251 and 252.
the grid voltage is greater in a negative direct-ion. When
This switching reactor arrangement is particularly ad
one of the contacts closes, the resistors in series therewith 10
vantaveous since it involves no moving parts and is vir
at opposite sides of the grid connection act as voltage
tually impervious to vibration and shock. These features
dividers and the grid voltage moves instantaneously in
a positive direction and the thyratron ?res.
are important from the standpoint of minimum mainte
nance, long life, and the ability to mount the control di
A variable resistor 166 in series with the armature 15%}
of the correction motor serves as a motor speed control 15 rectly on the knitting machine without concern due to the
vibration of. the machine.
to set the rate of control thereof.
in certain modern knitting machines the conventional
The remaining circuit elements shown in FIG. 3 are
tension arms and pivot shaft arrangements are being re
' largely conventional in thyr-atron tube circuitry and are
placed by spring plates which extend the full width of the
brie?y as follows:
The resistors 170 through 173 are voltage dividers 20 machine. These plates are secured along one edge and
have a curved surface at the opposite edge for engagement
* Whose values are selected so that when the contacts 144
The resistors 174 and 175 are
against the warp. Thus the ?exure of this entire plate
provides the spring tension against the warp threads. The
merely protective grid resistors which limit the grid bias.
control means of the present invention in its various forms
'or 145 close the respective grid bias is such that the
thyratron tube ?res.
‘ The numeral 180 designates a ?lament supply transformer 25 is equally adaptable to warp tension members of this type.
Contacts corresponding to the contact arm 432 may be
for the thyratron tubes. The condensers 181 and 182
comprise bypass capacitors between the grids and
mounted at opposite faces of such a spring plate at a point
cathodes of the thyratron tubes to protect against tran
sient or surge voltages. The resistors 183 and 190 are
’ outwardly of its ?xed edge to cooperate with spaced
“tight” and “loose” contacts in the same manner as de
isolation resistors and comprise part of the conventional 30 cribed above.
grid bias voltage level circuit. Switch 184 is controlled
I claim:
by the main machine driving motor to energize the con
1. Control apparatus for continuous material being un<
wound from a reel and passing to intermittent take-up
trol circuitry of FIG. 3 when the machine is started up.
The numeral 185 designates a grid bias supply trans
means including resilient means bearing against said ma
former and the numerals 186 and 187 designate grid bias 35 terial between said reel and said take-up means to main
supply recti?ers. The numeral 183 designates a conven
tain tension in said material and adapted to oscillate under
tional ?lter capacitor. The numeral 1S9 designates a
the intermittent action of said take-up means, a pair of
supply voltage transformer.
spaced electrical contacts, and means disposed between
A still further control arrangement is shown schemati
said contacts and movable with said tensioning means, the
‘ really in FIG. 4 and this embodiment involves a switching 4.0 spacing of said contacts being substantially less than the
reactor control circuit. FIG. 4 shows contacts 244 and
normal amplitude of oscillation 013 said last mentioned
' 245 which correspond, respectively, to the loose and tight
means whereby the latter engages both of said contacts
contacts of the preceding embodiments, and “forward”
and “reverse” ?eld coils 251 and 252 of an adjustment
tion of said tensioning means, variable drive means for
successively and alternately during each cycle of oscilla
' motor likewise corresponding to that of the preceding
said reel and a reversible electric motor engaging the same
embodiment, the armature thereof being designated 25s 45 to vary the ratio of said drive means in response to rota
in FIG. 4. It is to be understood that in this as in the
' preceding embodiments the entire control circuit will be
' duplicated to control the other warp beam of‘ a conven
tional knitting machine.
‘ Referring to the ?eld winding 25?. of H6. 4 and the
' manner in which the same is energized by closure of the
‘ contacts 244, a bridge arrangement 27d supplies direct
current to two control windings 27d and 277, the arrange
' ment being such that the windings are of opposite polarity.
' Winding 277 is in series with the tension arm contacts 244.
', Output windings 2% and 281 are arranged to provide full
' wave recti?cation and consequent full wave current to the
?eld winding designated 2:131 in FIG. 4.
tion of the motor in either direction, said contacts having
opposed electrical connection with said motor whereby
the direction and magnitude of energization of said motor
is a substantially continuous resultant of the relative time
periods of closure of said pair of contacts during each
cycle of oscillation of said tensioning means.
2. Control apparatus for continuous material being un
wound from a reel and passing to intermittent take-up
means including means bearing against said material be
tween said reel and said take~up means and adapted to
oscillate under the intermittent action or" said take-up
‘ means, a pair of. spaced electrical contacts, and means dis
posed between said contacts and movable with said oscil
When the contacts 244. are closed the current of the two,
lating means, the spacing of said contacts being substan
control windings 2.76 and 277, being of opposite polarity, 60 tially less than the normal amplitude of oscillationrof
add arithnietically to approximately zero and accordingly
said last mentioned means whereby the latter engages
both of said contacts successively and alternately during
the ‘. 'itching reaction output of the windings ass and Ztil.
each cycle of oscillation of said oscillating means, vari
is a maximum and held winding 25-1 is energized. When
the contacts 244 are open only the control winding 'Z‘id is
energized and the current through this winding is such as
to set the switching reaction output at approximately zero
and ?eld winding 251 is accordingly substantially deener
able‘ drive means for said reel and a reversible electric
motor engaging the same to vary the ratio of said drive
means in response to rotation of the motor in either di
rection, said contacts having opposed electrical connec
tion with said motor whereby the direction and magnitude
The reverse ?eld winding 252 is alternately energized 70 of energization of said motor is a substantially continuous
resultant of the relative time periods of closure of said
and deenergized in a similar manner under the control of
pair of contacts during each cycle of oscillation of said
contacts 245 through a duplicate switching reactor control
. gized.
oscillating means.
arrangement. Control windings 286 and 23-7 correspond,
3. Control apparatus for continuous material being
respectively, to control windings 27d and 277, and output
unwound
from a reel and passing to intermittent take-up
windings 29h andiel correspond to the output windings 75
3,078,616
8
means including variable drive means for substantially
each cycle of oscillation of said yieldable oscillating
continuously rotating said reel, resilient means bearing
means, variable drive means for said reel and a reversible
electric motor engaging the same to vary the ratio of
vsaid drive means in response to rotation of the motor
against said material between said reel and said take-up
means to maintain tension in said material and adapted
to oscillate under the intermittent action of said take-up
means, a reversible electric motor engaging said variable
drive means to vary the ratio thereof in response to
in either direction, said contacts having opposed elec
trical connection with said motor whereby the direction
and magnitude of energization of said motor is a sub
stantially continuous resultant of the relative time periods
mally open circuits for reversely energizing said motor,
of closure of said pair of contacts during each cycle of
means comprising a pair of spaced abutments and means 10 oscillation of said yieldable oscillating means.
comprising an abutment disposed between the spaced
6. In combination, reel means and intermittently oper
ating material engaging means spaced therefrom, said
abutments, one of said abutment means being movable
with said tensioning means, the spacing of said spaced
material passing from one of said means to the other,
abutments being substantially less than the amplitude of
variable drive means for substantially continuously rotat
oscillation of the movable abutment means whereby the 15 ing said reel, control apparatus comprising yieldable
means bearing against said material between said reel
abutment between the spaced abutments engages both of
said spaced abutments successively and alternately dur
and said engaging means and adapted to oscillate under
rotation of the motor in either direction, a pair of nor
ing each cycle of oscillation of said tensioning means,
said pair of normally open circuits being adapted to be
closed successively and alternately by engagement of 20
each of said spaced abutments with the abutment there
.
between, at least one of said abutment means being resil
iently yieldable whereby variations in tension of said
material which displaces the center of oscillation of said
tensioning means produces unequal abutment time pe
riods with respect to said spaced abutments, said oscilla
tions being relatively rapid whereby the direction and
the intermittent action of said engaging means, a revers
ible electric motor engaging said variable drive means
to vary the ratio thereof in response to rotation of the
motor in either direction, a pair of normally open cir
cuits for reversely energizing said motor, means com
prising a pair of spaced abutments and means comprising
an abutment disposed between the spaced abutments, one
of said abutment means being movable with said oscil
lating means, the spacing of. said spaced abutments being
substantially less than the amplitude of oscillation of the
magnitude of energization of said motor is a resultant of
movable-abutment means whereby the abutment between
the spaced abutments engages both of said spaced abut
the relative time periods of closure of said two pair of
reverse circuits during each cycle of oscillation of said 30 ments successively and alternately during each cycle of
tensioning means.
oscillation of said yieldable oscillating means, said pair
of normally open circuits being adapted to be closed
4. Control apparatus for continuous material being
successively andv alternately by engagement of each of
unwound from a reel and passing to intermittent take-up
means including variable drive means for substantially
said spaced abutments with the abutment therebetween,
continuously rotating said reel, means bearing against 35 at least one of said abutment means being resiliently
yieldable whereby variations in tension of said material
said material between said reel and said take-up means
which displaces the center of oscillation of said yieldable
and adapted to oscillate under the intermittent action
oscillating means produces unequal abutment time periods
of said take-up means, a reversible electric motor en
with respect to said spaced abutments, said oscillations
gaging said variable drive means to vary the ratio thereof
in response to rotation of the motor in either direction, 40 being relatively rapid whereby the direction and magni
tude of, energization of said motor is a substantially
a pair of normally open circuits for reversely energizing
continuous resultant of the relative time periods of clo
said motor, means comprising a pair of spaced abutments
sure of said two pair of reverse circuits during each cycle
and means comprising an abutment disposed between the
of oscillation of said yieldable oscillating means.
spaced abutments, one of said abutment means being mov
7. Control apparatus for continuous material being
able with said oscillating means, the spacing of said
spaced abutments being substantially less than the ampli 45 unwound from a reel and passing to intermittent take-up
means including means bearing against said material
tude of oscillation of the movable abutment means
between said reel and said take-up means and adapted
whereby the abutment between the spaced abutments
to oscillate under the intermittent action of said take-up
engages both of said spaced abutments successively and
means, a pair of spaced electrical contacts, and means
alternately during each cycle of oscillation of said oscil
lating means, said pair of normally open circuits being 50 disposed between said contacts and movable with said
oscillating means, the spacing of said contacts being
adapted to be closed successively and alternately by
substantially less than the normal‘ amplitude of oscilla
engagement of each of said spaced abutments with the
tion of said last mentioned means whereby the latter
abutment therebetween, at least one of said abutment
engages both of said contacts successively and alternately
means being resiliently yieldable whereby variations in
during each cycle of oscillation of said oscillating means,
tension of said material which displaces the center of
variable drive means for said reel and a reversible elec
oscillation of said oscillating means produces unequal
tric motor engaging the same to vary the ratio of said
abutment time periods with respect to said spaced abut
ments, said oscillations being relatively rapid whereby
the direction and magnitude of energization of said motor
is a resultant of the relative time periods of closure of
said pair of reverse circuits during each cycle of oscilla
tion of said oscillating means.
5. In combination, reel means and intermittently oper
ating material engaging means spaced therefrom, said
material passing from one of said means to the other,
drive means in response to rotation of the motor in either
direction, and transducer means acting between said con
tacts and said motor whereby the direction and magnitude
of energization of said motor is a substantially continu
ous resultant of the relative time periods of closure of
said pair of contacts during each cycle of oscillation of
said oscillating means.
8. Control apparatus for continuous material being
unwound from a reel and passing to intermittent take-up
means including variable drive means for substantially
yieldable means bearing against said material between
said reel and said engaging means and adapted to oscil
continuously rotating said reel, means bearing against
late under the intermittent action of said engaging means,
a pair of spaced electrical contacts, and means disposed 70 said material between said reel and said take-up-means
and adapted to oscillate under the intermittent action of
between said contacts and movable with said yieldable
said
take-up means, a reversible electric motor engaging
oscillating means, the spacing of said contacts being sub
said variable drive means to vary the ratio thereof in
stantially less than the normal amplitude of oscillation
response to rotation of the motor in either direction,
of said last mentioned means whereby the latter engages
means comprisingta pair of spaced abutments and means
both of said contacts successively and alternately during 75 comprising an abutment disposed between the spaced
3,076,615
abutment-s, one of said abutment means being movable
with said oscillating means, the spacing of said spaced
abutments being substantially less than the amplitude of
oscillation of the movable abutment means whereby the
abutment between the spaced abutments engages both of
said spaced abutments successively and alternately during
10
transducer means acting between said circuits and said
motor whereby the direction and magnitude of energiza
tion of said motor is a resultant of the relative time
periods of closure of said pair of circuits during each
5 cycle of oscillation of said oscillating means.
each cycle of oscillation of said oscillating means, a pair
of normally open circuits adapted to be closed succes
sively ‘and alternately by engagement of each of said
spaced abutments with the abutment therebetween, at 10
least one of said abutment means being resiliently yield
able whereby variations in tension of said material which
displaces the center of oscillation of said oscillating
means produces unequal abutment time periods with re
spect to said spaced abutments and consequent unequal
time periods of energization of said pair of circuits, and
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,664,724
2,719,419
Lambach et a1 __________ __ Jan. 5, 1954
Fleckenstein ___________ .. Oct. 4, 1955
2,720,093
2,734,253
Lambach et al _________ __ Oct. 11, 1955
Suggs _______________ __. Feb. 14, 1956
844,453
Great Britain _________ __ Aug. 10, 1960
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