CA1124818A - Loom storage feeder improvement - Google Patents
Loom storage feeder improvementInfo
- Publication number
- CA1124818A CA1124818A CA331,543A CA331543A CA1124818A CA 1124818 A CA1124818 A CA 1124818A CA 331543 A CA331543 A CA 331543A CA 1124818 A CA1124818 A CA 1124818A
- Authority
- CA
- Canada
- Prior art keywords
- strand
- rate
- drum
- motor
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
- D03D47/36—Measuring and cutting the weft
- D03D47/361—Drum-type weft feeding devices
- D03D47/367—Monitoring yarn quantity on the drum
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Forwarding And Storing Of Filamentary Material (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
Abstract
LOOM STORAGE FEEDER IMPROVEMENT
ABSTRACT
The disclosure relates to a system and method for matching yarn withdrawal speed from a yarn supply package and utility means such as a shuttleless loom thereby re-ducing the possibility of supply package sloughs and yarn breakage caused by conditions such as large changes in load-ing on an intermediate rotary drum type yarn feeding and tensioning storage device. Thus, the drum of the storage device is driven by a d-c motor controlled to provide a con-stant drum drive speed thereby withdrawing yarn from the supply package at a constant rate. said rate is slightly higher than the consumption rate of the utility means. The drum speed is maintained constant by a feedback system which avoids changes in speed of the drum except when occurrences of an overfill of yarn on the drum occur. Thus, a constant speed drum drive system in this invention replaces variable speed or constant torque drum drive systems of the prior art which drive in relation to loom consumption resulting in frequent storage feeder stops and starts which in turn re-sult in package sloughs and/or yarn breakage.
ABSTRACT
The disclosure relates to a system and method for matching yarn withdrawal speed from a yarn supply package and utility means such as a shuttleless loom thereby re-ducing the possibility of supply package sloughs and yarn breakage caused by conditions such as large changes in load-ing on an intermediate rotary drum type yarn feeding and tensioning storage device. Thus, the drum of the storage device is driven by a d-c motor controlled to provide a con-stant drum drive speed thereby withdrawing yarn from the supply package at a constant rate. said rate is slightly higher than the consumption rate of the utility means. The drum speed is maintained constant by a feedback system which avoids changes in speed of the drum except when occurrences of an overfill of yarn on the drum occur. Thus, a constant speed drum drive system in this invention replaces variable speed or constant torque drum drive systems of the prior art which drive in relation to loom consumption resulting in frequent storage feeder stops and starts which in turn re-sult in package sloughs and/or yarn breakage.
Description
112~818 DESCRIPTIO~
This invention relates to systems and methods for feeding yarn under controlled conditions from a supply to utility means such as a shuttleless loom, and more specifi-cally, it relates to yarn tensioning anc feed speed controlmeans producing an interface between a supply of yarn and utility means consuming said yarn.
In the classical shuttle loom the weft yarn is in-serted in the loom shed by the filling bobbin itself carried ~y the shuttle. The unwinding process takes place simul-taneously with the passage of the bobbin through the shed, so that no specific tension problems are encountered~
Shuttleless looms incorporate new and quite radical changes in the weft insertion system. For example, since the weft yarn supply is stationary and outside the loom, with-drawal of the yarn from the supply with each pick of the loom involves alternating acceleration and deceleration of that yarn. The acceleration rate is, of course, a direct re-1ection of the loom withdrawal process. During acceleration and deceleration the balloon created as the yarn is pulled off in over-end fashion from the supply package is alter-nately established and collapsed. As a consequence, and in the absence ~n intermediate yarn storage means, high tensions are created in the weft yarn being withdrawn from its stationary supply during the acceleration phase of each pic~.
Such high tensions can cause sloughing of the weft yarn being withdrawn from the supply. Moreover, loom stops can occur, 28 and kinks can be produced in the fabric, all of which lead 11248~8 to reduced loom efficiency and reduced fabric quality.
Accordingly, because ~f the necessity to feed yarn reliably from supplies at high speed into shuttlelesc looms and the like which operate intermittently to consume yarn in-crements during the picking motion as just described, drum storage and tensioning devices are used in an attempt to reduce snarls and breakage of yarn and to level tensions caused by intermittent withdrawal of yarn from a supply by the loom weft insertion system. One example of such drum storage devices i8 U- 8. Patent 3,776,480 issued to John B.
Lawson on December 4, 1973, showing the drums and their mode of operation. These prior art drums have as their ob-jective a constant tension yarn feed from the drum to the yarn consumption utility means.
It has also been Xnown in the prior art to sense the store of yarn on the intermediate drum and to change the drum rotation sp~ed by braking the drum cpeed whenever the store of yarn becomes excessive. This technique is typified by U. S. Patent 3,225,446 issued to A. G. Sarfati et al, on December 28, 1965, which clutches a multiple ratio differen-tial for accelerating and decelerating the drum speed in re-sponse to detection of a corresponding decrease or increase of yarn stored thereon. Another example of such speed con-trol is U. S. Patent 3,796,385 issued to K. A. G. Jacobsson on March 12, 1974, which uses a pivoting mechanical yarn supply sensor and corresponding electrical contact switch for varying the drum speed by switching on and off the a-c ~`
motor drive circuit.
Drum storage systems of the prior art for the purpose of controlling tension to the utility means are either designed to have continuously changing drum drive motor speeds establishing repetitive acc~eration-deceleration phases or they inherently produ~e changing motor speeds with different drum load in an atten;~t to produce a constant torque drive to the drum. In either case yarn sloughing from re-establishing the balloon and/or breakage of yarn is encouraged by the repeated accelerations. The drum load and, therefore, speed can change drastically. Speed variation has been measured as much as 7~/O from change of friction be-tween cold start and stable temperature c,onditions. Also, package tensions have been measured to vary several hundred grams. In a-c motors, slip speed varies with loading. D-C
motor speed is sensitive to both voltage and load variations.
Prior art system designs, particularly constant tor~ue drum drive arrangements, have led to unresolved pro-blems over wide ranges of operating conditions in the winding of yarn from a supply package onto the drum. Sp~cifically, load changes encountered from yarn package tensions and from frictional forces active in the storage feeder precludes operating at a speed matching loom withdrawal speed. In an effort to meet this problem it has been customary in the prior art to operate the storage drum at speeds substantially in excess of the weft yarn consuming speedO A consequence of this has been that the yarn from the supply package inter-28 mittently stops and starts, encouraging sloughing and breakage.
112~818 Accordingly, it is a general object of this in-vention to resolve such prior art problems of a yarn tension-ing system having drum intermediate storage and tensioning control means by reducing significantly any ~loughing or S breakage resulting from changing drum motor drive speed or load.
Thi~ is achieved by ~ontrolling the drum spee~ at a constant value ~ubstantially matching the reguired yarn withdrawal rate.
More particularly, t~ere is provided a strand feeding system between a ~trand supply and strand utility means such as a textile machine requiring strand to be fed at a substantially constant value comprising in combination, a drum feeding device receiving said strand from said supply and wrapping it about said drum for discharge thereafter to said utility means, a d-c variable speed drive motor for rotating said feeding device to thereby with-draw said strand from said ~upply ~t a rate determined by the rotating speed of said feeding device, speed con-trol means programmed to e~tablish a constant speed of said d-c motor ~n response to in~ut feedback data, selectively adjustable voltage input means coupled to said ~peed control means e~tabli~hing a strand feed xate substantially equal to said predetermined average value, feedback detector means deriving a signal proportional to the speed of rotation of fiaid motor connected to maintain the motor speed at said predetermined value over changing load conditions by varying motor voltage and ~orque, whereby continuous rotation of said feeding de-vice is maintained to supply said strand to said utility de-vice at said average strand feed rate over relatively long ~eriods of time thereby reducing drum feeding device acceler-ation and deceleration cycles ~nd thereby reducing problems of sloughing and breakage of said strand.
There is also provided a strand feeding system between a strand supply and strand utility means such as a textile machine requiring strand to be fed at a predetermined average value during operation of said utility means comprising in combination, a feed-ing device including a drum, said drum being arranged to receive said strand from sa~d supply and have it wrapped it about said drum for discharge thereafter to said utility means, a d-c variable speed drive motor for rotating ~aid feeding device to thereby withdraw ~aid strand from 6aid supply at a rate determined by the rotating speed of said feeding device, 6aid d-c motor being independent from ~aid utility means, ~peed control means programmed to estab-lish a constant speed of said d-c motor in response to input feedback data, selectively adjustable voltage input means coupled to ~aid speed control means establishing a strand feed rate substantially equal to said predetermined average value, feed-back detector mean~ deriving a signal proportional to the speed of rotation of said tor connected to maintain the motor speed at said predetermined average value o~er changing load conditions by varying motor voltage and ~orque, whereby rotation of said feeding device i~ controlled to supply said ~trand to said utility device at ~aid predetermined average value thereby reducing acceleration and deceleration cycles of 6aid feeding device.
There is also provided a strand feeding system between a strand supply and utility means such as a textile machine requiring strand to be fed at a first predetermined average rate during operation of the utility means comprising, a feeding device arranged to receive said strand from said supply and have the strand wrapped 30 thereon for disc~arge thereater to 8aid utility means, a balloon of stran~ being formed in the zone intermediate the strand supply and the feeding device during advance of the strand to the feed-ing device, a variable fipeed drive motor for operating said feed--4a-11248~8 ing device to withdraw said strand ~rom said ~upply, an on-off circuit for controlling current flo~ to ~aid motor to prevent excess accumulation of ~trand on ~aid drum, speed control means programmed to establish a constant dr~en speed of ~aid motor in response to input feedback data, ~electively adjustable input means coupled to 6aid ~peed control means to advance ~aid ~trand from said supply to said feeding device at a second pre-determined average rate which i8 slightly higher than said first predetermined aver~ge rate, and detector means for ~ensing accumulation of strand on said feed~ng device and operable to activate ~aid on-off circuit to interrupt current flow to ~aid tor when the ~trand accumulation on ~aid feeding device exceeds a preselected amount, ~aid on-off circuit being operated at a frequency and duration to maintain ~aid balloon during intervals when current flow to Eaid motor i~ off.
There is further proYided the method of controlling the rate of strand delivery between a strand supply and utility means consuming the 6trand at 2 substantially constant average strand rate comprising the 6teps of, operating a storage device to with-draw said 6trand from ~aid ~trand ~upply, controlling said fitorage device at a ~ùbstantially constant strand con-sumption rate to wind ~aid ~trand thereon at a rate matching ~ubstantially said average constant rate of consumption of caid utility means, and maintaining the storage device cQn-~umption rate constant by feedback regulating means respon-sive to the actual storage consumption rate.
There is further provided the method of controlling the rate of strand delivery between a strand supply and utility means consuming the strand at a substantially constant average strand rate comprising the steps of, operating a storage device by drive means independent of said utility means to withdraw said strand from said ~trand supply, controlling ~aid drive mean~ to thereby operate f . -4b-1124~8 said storage device at a substantially constant etrand consump-tion rate to wind said ~trand thereon at a rate matching substan-tially æaid average constant rate of congumption of said utility mRans, and maintaining the storage device winding rate constant by feedback regulating means ~esponsive to the actual winding rate of said etorage device.
There i8 ~urther provided a method for controlling strand delivery between a strand supply and utility means requiring said strand to be fed at a first substantially constant predetermined average rate comprising the steps of, operating a strand feeding device through electric drive means to advance the strand from said strand supply and wind said strand on said feeding device for di~charge thereafter to said utility means, forming a balloon ~n Said.advancing ætrand intermediate said st~and supply and ~aid.feeding device, controlling said drive means to operate eaid feeding device to withdraw ~aid strand from said strand æupply at a econd ubstantially conætant predetermined average ratewhich is lightly higher than said first predetermined a~erage rate, detecting the accumulation o~ strand on ~a~d feeding device, interrupting the current flow to said drive mean~ when the amount of strand on æaid feeding device exceedæ a predetermined ~mount, and controlling the frequency and duration of said interruptions to maintain the balloon in æaid strand when the current flow is ~nterrupted.
SUMMARY OF THE INVENTION
Accoràingly, the present invention to achieve this constant drum drive speed provides for use of a speed con-trolled d-c motor drive for the intermediate storage drum of a yarn tensioning system. Constant drum drive æpeed is achieved through feedbacX control sensing the motor speed and maintaining the actual drive speed at a constant value. A
~' -4c-nominal ~peed matching the yarn consumption speed of the utilization device withdrawing the yarn stored on the drum is set initially into the system.
The constant speed drum drive approach of this in-vention changes the prior art drum drive control techniques from conventional variable speed to control the supply of yarn on the drum and controls to keep constant the drive torque to the drum. Accordingly, the constant drum speed control in the presence of varying load inevitably encountered in these systems, produces variable torque drive to the drum thereby reducing breakage and sloughing in the feeding of yarn from the yarn storage spool to the intermediate storage drum.
, ~,,, `~ 11248~8 DESCRIPTION O~ DRAWINGS
In the accompanying drawings, Figure 1 is a diagrammatic system block diagram showing the inter-related elements for driving a drum at a constant speed, and Figure 2 is a schematic circuit diagram of a pre-ferred control system embodlment of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As may be seen from the system arrangement of Figure l, a shuttleless loom 10 consumes increments of yarn Y withdrawn thereby from a supply package 12 in the conven-tional manner of a shuttleless loom at a substantially con-stant tension by action of an intermediate rotary drum storage and tensioning unit 14. said storage and tension-ing unit 14 can take a form and can include conventional de-tails such as set forth in the above-mentioned Lawson patent including a drum 16 upon which the yarn Y is wound from pacX-age 12 as the yarn advances to loom 10. The drum 16 of the storage and tensioning means 14 is illustra$ed to indicate its arrangement in the system to withdraw yarn Y from supply package 12 and feed it at constant tension to the loom 10.
Unit 14 includes a main shaft 20 which is connect-ed with a d c electrical variable speed motor 22 to be dri.ven thereby, the shaft 20, in effect, being arranged as the arm-~5 ature of the motor 22. Shaft 20 has a slot 26 milled therein to receive a crank-shaped yarn tube 30 therein as illustrated in Figure l. Tube 30, being centerless, serves as a means 28 for guiding the yarn from supply 12, through the tube and
This invention relates to systems and methods for feeding yarn under controlled conditions from a supply to utility means such as a shuttleless loom, and more specifi-cally, it relates to yarn tensioning anc feed speed controlmeans producing an interface between a supply of yarn and utility means consuming said yarn.
In the classical shuttle loom the weft yarn is in-serted in the loom shed by the filling bobbin itself carried ~y the shuttle. The unwinding process takes place simul-taneously with the passage of the bobbin through the shed, so that no specific tension problems are encountered~
Shuttleless looms incorporate new and quite radical changes in the weft insertion system. For example, since the weft yarn supply is stationary and outside the loom, with-drawal of the yarn from the supply with each pick of the loom involves alternating acceleration and deceleration of that yarn. The acceleration rate is, of course, a direct re-1ection of the loom withdrawal process. During acceleration and deceleration the balloon created as the yarn is pulled off in over-end fashion from the supply package is alter-nately established and collapsed. As a consequence, and in the absence ~n intermediate yarn storage means, high tensions are created in the weft yarn being withdrawn from its stationary supply during the acceleration phase of each pic~.
Such high tensions can cause sloughing of the weft yarn being withdrawn from the supply. Moreover, loom stops can occur, 28 and kinks can be produced in the fabric, all of which lead 11248~8 to reduced loom efficiency and reduced fabric quality.
Accordingly, because ~f the necessity to feed yarn reliably from supplies at high speed into shuttlelesc looms and the like which operate intermittently to consume yarn in-crements during the picking motion as just described, drum storage and tensioning devices are used in an attempt to reduce snarls and breakage of yarn and to level tensions caused by intermittent withdrawal of yarn from a supply by the loom weft insertion system. One example of such drum storage devices i8 U- 8. Patent 3,776,480 issued to John B.
Lawson on December 4, 1973, showing the drums and their mode of operation. These prior art drums have as their ob-jective a constant tension yarn feed from the drum to the yarn consumption utility means.
It has also been Xnown in the prior art to sense the store of yarn on the intermediate drum and to change the drum rotation sp~ed by braking the drum cpeed whenever the store of yarn becomes excessive. This technique is typified by U. S. Patent 3,225,446 issued to A. G. Sarfati et al, on December 28, 1965, which clutches a multiple ratio differen-tial for accelerating and decelerating the drum speed in re-sponse to detection of a corresponding decrease or increase of yarn stored thereon. Another example of such speed con-trol is U. S. Patent 3,796,385 issued to K. A. G. Jacobsson on March 12, 1974, which uses a pivoting mechanical yarn supply sensor and corresponding electrical contact switch for varying the drum speed by switching on and off the a-c ~`
motor drive circuit.
Drum storage systems of the prior art for the purpose of controlling tension to the utility means are either designed to have continuously changing drum drive motor speeds establishing repetitive acc~eration-deceleration phases or they inherently produ~e changing motor speeds with different drum load in an atten;~t to produce a constant torque drive to the drum. In either case yarn sloughing from re-establishing the balloon and/or breakage of yarn is encouraged by the repeated accelerations. The drum load and, therefore, speed can change drastically. Speed variation has been measured as much as 7~/O from change of friction be-tween cold start and stable temperature c,onditions. Also, package tensions have been measured to vary several hundred grams. In a-c motors, slip speed varies with loading. D-C
motor speed is sensitive to both voltage and load variations.
Prior art system designs, particularly constant tor~ue drum drive arrangements, have led to unresolved pro-blems over wide ranges of operating conditions in the winding of yarn from a supply package onto the drum. Sp~cifically, load changes encountered from yarn package tensions and from frictional forces active in the storage feeder precludes operating at a speed matching loom withdrawal speed. In an effort to meet this problem it has been customary in the prior art to operate the storage drum at speeds substantially in excess of the weft yarn consuming speedO A consequence of this has been that the yarn from the supply package inter-28 mittently stops and starts, encouraging sloughing and breakage.
112~818 Accordingly, it is a general object of this in-vention to resolve such prior art problems of a yarn tension-ing system having drum intermediate storage and tensioning control means by reducing significantly any ~loughing or S breakage resulting from changing drum motor drive speed or load.
Thi~ is achieved by ~ontrolling the drum spee~ at a constant value ~ubstantially matching the reguired yarn withdrawal rate.
More particularly, t~ere is provided a strand feeding system between a ~trand supply and strand utility means such as a textile machine requiring strand to be fed at a substantially constant value comprising in combination, a drum feeding device receiving said strand from said supply and wrapping it about said drum for discharge thereafter to said utility means, a d-c variable speed drive motor for rotating said feeding device to thereby with-draw said strand from said ~upply ~t a rate determined by the rotating speed of said feeding device, speed con-trol means programmed to e~tablish a constant speed of said d-c motor ~n response to in~ut feedback data, selectively adjustable voltage input means coupled to said ~peed control means e~tabli~hing a strand feed xate substantially equal to said predetermined average value, feedback detector means deriving a signal proportional to the speed of rotation of fiaid motor connected to maintain the motor speed at said predetermined value over changing load conditions by varying motor voltage and ~orque, whereby continuous rotation of said feeding de-vice is maintained to supply said strand to said utility de-vice at said average strand feed rate over relatively long ~eriods of time thereby reducing drum feeding device acceler-ation and deceleration cycles ~nd thereby reducing problems of sloughing and breakage of said strand.
There is also provided a strand feeding system between a strand supply and strand utility means such as a textile machine requiring strand to be fed at a predetermined average value during operation of said utility means comprising in combination, a feed-ing device including a drum, said drum being arranged to receive said strand from sa~d supply and have it wrapped it about said drum for discharge thereafter to said utility means, a d-c variable speed drive motor for rotating ~aid feeding device to thereby withdraw ~aid strand from 6aid supply at a rate determined by the rotating speed of said feeding device, 6aid d-c motor being independent from ~aid utility means, ~peed control means programmed to estab-lish a constant speed of said d-c motor in response to input feedback data, selectively adjustable voltage input means coupled to ~aid speed control means establishing a strand feed rate substantially equal to said predetermined average value, feed-back detector mean~ deriving a signal proportional to the speed of rotation of said tor connected to maintain the motor speed at said predetermined average value o~er changing load conditions by varying motor voltage and ~orque, whereby rotation of said feeding device i~ controlled to supply said ~trand to said utility device at ~aid predetermined average value thereby reducing acceleration and deceleration cycles of 6aid feeding device.
There is also provided a strand feeding system between a strand supply and utility means such as a textile machine requiring strand to be fed at a first predetermined average rate during operation of the utility means comprising, a feeding device arranged to receive said strand from said supply and have the strand wrapped 30 thereon for disc~arge thereater to 8aid utility means, a balloon of stran~ being formed in the zone intermediate the strand supply and the feeding device during advance of the strand to the feed-ing device, a variable fipeed drive motor for operating said feed--4a-11248~8 ing device to withdraw said strand ~rom said ~upply, an on-off circuit for controlling current flo~ to ~aid motor to prevent excess accumulation of ~trand on ~aid drum, speed control means programmed to establish a constant dr~en speed of ~aid motor in response to input feedback data, ~electively adjustable input means coupled to 6aid ~peed control means to advance ~aid ~trand from said supply to said feeding device at a second pre-determined average rate which i8 slightly higher than said first predetermined aver~ge rate, and detector means for ~ensing accumulation of strand on said feed~ng device and operable to activate ~aid on-off circuit to interrupt current flow to ~aid tor when the ~trand accumulation on ~aid feeding device exceeds a preselected amount, ~aid on-off circuit being operated at a frequency and duration to maintain ~aid balloon during intervals when current flow to Eaid motor i~ off.
There is further proYided the method of controlling the rate of strand delivery between a strand supply and utility means consuming the 6trand at 2 substantially constant average strand rate comprising the 6teps of, operating a storage device to with-draw said 6trand from ~aid ~trand ~upply, controlling said fitorage device at a ~ùbstantially constant strand con-sumption rate to wind ~aid ~trand thereon at a rate matching ~ubstantially said average constant rate of consumption of caid utility means, and maintaining the storage device cQn-~umption rate constant by feedback regulating means respon-sive to the actual storage consumption rate.
There is further provided the method of controlling the rate of strand delivery between a strand supply and utility means consuming the strand at a substantially constant average strand rate comprising the steps of, operating a storage device by drive means independent of said utility means to withdraw said strand from said ~trand supply, controlling ~aid drive mean~ to thereby operate f . -4b-1124~8 said storage device at a substantially constant etrand consump-tion rate to wind said ~trand thereon at a rate matching substan-tially æaid average constant rate of congumption of said utility mRans, and maintaining the storage device winding rate constant by feedback regulating means ~esponsive to the actual winding rate of said etorage device.
There i8 ~urther provided a method for controlling strand delivery between a strand supply and utility means requiring said strand to be fed at a first substantially constant predetermined average rate comprising the steps of, operating a strand feeding device through electric drive means to advance the strand from said strand supply and wind said strand on said feeding device for di~charge thereafter to said utility means, forming a balloon ~n Said.advancing ætrand intermediate said st~and supply and ~aid.feeding device, controlling said drive means to operate eaid feeding device to withdraw ~aid strand from said strand æupply at a econd ubstantially conætant predetermined average ratewhich is lightly higher than said first predetermined a~erage rate, detecting the accumulation o~ strand on ~a~d feeding device, interrupting the current flow to said drive mean~ when the amount of strand on æaid feeding device exceedæ a predetermined ~mount, and controlling the frequency and duration of said interruptions to maintain the balloon in æaid strand when the current flow is ~nterrupted.
SUMMARY OF THE INVENTION
Accoràingly, the present invention to achieve this constant drum drive speed provides for use of a speed con-trolled d-c motor drive for the intermediate storage drum of a yarn tensioning system. Constant drum drive æpeed is achieved through feedbacX control sensing the motor speed and maintaining the actual drive speed at a constant value. A
~' -4c-nominal ~peed matching the yarn consumption speed of the utilization device withdrawing the yarn stored on the drum is set initially into the system.
The constant speed drum drive approach of this in-vention changes the prior art drum drive control techniques from conventional variable speed to control the supply of yarn on the drum and controls to keep constant the drive torque to the drum. Accordingly, the constant drum speed control in the presence of varying load inevitably encountered in these systems, produces variable torque drive to the drum thereby reducing breakage and sloughing in the feeding of yarn from the yarn storage spool to the intermediate storage drum.
, ~,,, `~ 11248~8 DESCRIPTION O~ DRAWINGS
In the accompanying drawings, Figure 1 is a diagrammatic system block diagram showing the inter-related elements for driving a drum at a constant speed, and Figure 2 is a schematic circuit diagram of a pre-ferred control system embodlment of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As may be seen from the system arrangement of Figure l, a shuttleless loom 10 consumes increments of yarn Y withdrawn thereby from a supply package 12 in the conven-tional manner of a shuttleless loom at a substantially con-stant tension by action of an intermediate rotary drum storage and tensioning unit 14. said storage and tension-ing unit 14 can take a form and can include conventional de-tails such as set forth in the above-mentioned Lawson patent including a drum 16 upon which the yarn Y is wound from pacX-age 12 as the yarn advances to loom 10. The drum 16 of the storage and tensioning means 14 is illustra$ed to indicate its arrangement in the system to withdraw yarn Y from supply package 12 and feed it at constant tension to the loom 10.
Unit 14 includes a main shaft 20 which is connect-ed with a d c electrical variable speed motor 22 to be dri.ven thereby, the shaft 20, in effect, being arranged as the arm-~5 ature of the motor 22. Shaft 20 has a slot 26 milled therein to receive a crank-shaped yarn tube 30 therein as illustrated in Figure l. Tube 30, being centerless, serves as a means 28 for guiding the yarn from supply 12, through the tube and
2~8~8 outwardly from its end 32 for wrapping about drum 16 as shaft 20 and tube 30 are rotated via motor 22. As the yarn is wound onto drum 16 the yarn is advanced from a first end of drum 16, generally indicated by the numeral 38 to a second S or remote end of drum 16, identified by the numeral 40, by means of a yarn advancing mechanism 44 more fully described in the afore_mentioned Lawson patent. From drum ~0 the yarn is delivered overend from the drum and drawn across a tapered nosepiece 48 mounted on shaft 20 and led beneath a stationary brush 50 bearing on the surface of nosepiece 48.
Thus, brush 50 cooperates control means for the yarn being drawn off drum 16 by loom 10. The yarn is directed from nosepiece 48 through a guide 54, supported from a bracket 56 attached to a support frame 60 for the drum 16 and associ-ated parts, and then conveyed to loom 10. Drum 16 is heldstationary by means of a plurality of magnets 64 as yarn Y
is wound thereon and withdrawn therefrom, the drum 16 being supported from shaft 20 on ball bearings 66 and 68 positioned at its opposite ends to isolate it from the rotational move-ment of the shaft 20. For further particulars of the unit14 just described reference may be had to the prior cited Lawson patent.
As has already been stated in accordance with the present invention, drum 16 is driven by d-c electrical vari-ble speed motor 22. Other drive means such as gearing or adrive belt can be substituted as desired to give an appro-priate drum speed in response to the running speed of the 28 d-c motor ~2.
-` 1124818 A control system including the SCR phase control circuitry 70 establishes from the +20 volt d-c terminal 72 a varying d-c voltage at motor lead 74 for control of the motor speed as various load conditions are encountered, such S as the afore-mentioned intermittent tension load of the supply yarn Y when pulled from package 12 or the friction of the system upon cold startup, thereby assuring under all op~ra-ting conditions over long operating periods a matching of the speed of withdrawal of yarn Y from supply package 12 with con-sumption in loom 10.
In order to provide an adjustment for nominal motorspeed to match closely that desired for feeding yarn onto the drum 16 from supply package 12 at the same average rate at which it is withdrawn by loom 10, an RPM voltage control means 78 is made available for selective manual adjustment. This serves to establish the running speed setting from drum 16, which i5 thereafter maintained continuously constant by a feedback circuit comprising motor speed detector 80 and speed responsive voltage converter circuit 82. To further decrease system loading changes, detector 80 is preferably a contact-less magnetic Hall-effect type detector that senses the passing poles of a set of six rotating magnets 84 arranged on disc 86 rotated by the motor 22. Accordingly, the ~frequency to voltage~ converter circuit 82 senses an appro-priate frequency proportional to speed of motor 22 for con-version to a corresponding control voltage. This corrective control voltage, by medium of SCR phase control circuit 70 28 is established at a feedback magnitude tending to keep the 1124~18 d-c motor speed constant at the speed set by RPM voltage control means 7~ in the presence of changing load, voltage or other variable system conditions.
This constant speed operation of drum 16 serves to prevent frequent acceleration and deceleration phases that cause sloughing or breakage of the yarn Y being fed onto drum 1~ from supply package 12.
For proper operation of intermediate storage drum 16 the amount of yarn stored on drum 16 is sensed by a pivot-able ferrous member 90. This sensing is accomplished without additional friction or load, as is the motor speed, by mag-netic Hall-effect type detector 92 and operates whenever the supply of yarn on the drum becomes excessive by pivoting member 90 away from detector 92, or conversely. This actuates an on-off control circuit 94 for the d-c motor 22, to prevent overfilling of yarn on drum 16 for any reason such as stop-page of loom 10.
In operation therefore RPM vol~age control means 78 is set so that the speed of drum 16 is very close to but slightly exceeds that required to match the withdrawal of yarn from the drum by loom 10. The on-off control 94 there-fore need operate only infrequently or the purpose of routinely co,-recting yarn overfill so that the necessary acceleration-deceleration phases caused by motor shut down and restart are minimized to avoid the corresponding tension-ing and ballooning problems of withdrawal of yarn bailoon 9 from supply package 12 onto the drum 16.
28 As can be therefore understood except for these 48~8 infrequent deviations, in operation the drum 16 is driven at constant speed for continuously supplying yarn Y from supply package 12 onto the drum 16 at a rate matched with the average withdrawal rate at loom 10. Therefore, there is no change of drum speed in the routihe operation of the system.
The electrical control circuit configuration is set forth in the schematic circuit diagram of Figure 2, wherein the same reference characters are used for comparison of similar system elements.
Magnetic motor speed detector 80 is a Hall-effect device sensing the six magnetic poles per revolution of disc 86 in Figure 1 to provide an appropriate frequency of im-pulses into the input network 64 for processing in the fre-quency to voltage converter circuit 82. Circuit operating voltage ~12 volts d-c at terminal 100 as well as motor drive voltage +20V d-c at terminal 72 is supplied from a sùitable d-c supply not shown. All circuit parameters are shown and the various elements shown in block form are conventional commercially available units as hereinafter identified.
The resulting variable voltage output proportional to the actual drum rotation speed will appear on lead 104 for input control to terminal 106 of the SCR motor speed control circuit 70 in a magnitude that will adjust the speed of motor 22 to comper.sate for changes of loading, voltage, etc., en-countered in operation by control of the SCR device 110 in series with the motor 22 in the operating voltage supply path from terminal 72.
28 The motor speed signal derived from detector 80 is 11~4818 fed to a frequency-to-voltage converter circuit 82 which changes detector 80 output pulses to D. C. voltage. The level of this D. C. voltage is controlled by the voltage con-trol means 78 which establishes the nominal running speed of S motor 22 and is therefore set to match the rotation speed of the yarn drum 16 to coincide with the average consumption rate of yarn in the utility device as hereinbefore discussed.
The magnetic Hall-effect type detector 92 which ~enses the storage level of yarn on the drum 16 controls the transistorized electronic switch circuit 110 which serves by way of transistor 112 to selectively establish a sub-stantially ground voltage level at lead 105 thereby to pre-vent motor current flow through SCR device 110 and turn the motor off. In the preferred mode the motor is turned fully off so that ~he circuit is responsive to turn off the drum in response to yarn feeding failures, etc., and in addition performs the function of monitoring the drum storage capacity of drum 16 to assure that it is not overfilled. Only the over-fill capacity need be sensed for on-off drum control to per-form the storage monitoring function if the RPM control 78is set for a drum speed very slightly greater than that necessary to feed the utility device, and in this mode the number of changes of motor speed is minimized as compared with the prior art necessity to repetitively change drum speed and, therefore, to significantly increase the oppor-tunity for yarn ballooning and breakage.
Furthermore, this preferred embodiment has the 28 additional advantages of prGviding effective controls that --10_ 11248~8 do not in any way load the drum or yarn drive paths to up-set the delicate balances necessary for high speed trouble free yarn processing over long operating periods. This is effected by the electronic-magnetic sensing circuit em~odi-ment which furthermore is long-life without mechanical wear or electrical contact problems. Additionally, the sensing frequency parameters and electronic circuit time constants as established by the R-C networks therein are ideally suit-ed for fast response to the intermittent instantaneous load conditions encountered in removing yarn from a bobbin or from system friction, etc., that cannot be followed by mechanically operated sensing means or mechanically moved control members.
Although the circuit technology itself is conven-tional o~tside this particular system, and may take otherforms, the preferred embodiment which affords a combination of improved and co-acting operational features is constructed of the following commercially available component elements:
Motor 22 -- Model 12FP manufactured by Printed Motor Division Kollmorgen Corporation Glen Cove, New York Hall Effect -- Model UGN-3020T manufactured Detector 80 by Sprague Electric Company and 92 Concord, New Hampshire Frequency-to- -- Part No. RC4151NB manufactured Voltage Converter by Raytheon, Semi-Conductor DiV.
Integrated Circuit Mountain View, California 5 SCR Motor Speed O- Model No. L 120Bl manufacturcd by SGS - Ates Semiconductor Corporation Newtonville, Massachusetts 2~ It is clear, therefore, from the foregoing -lJ.-248~8 description of the invention and a preferred embodimentthereof that there is provided a new and improved system for controlling the tension and feeding conditions of yarn from a supply bobbin source to utility means such as a loom. By controlling the rotational speed of the intermediate storage drum-tensioning device to achieve a constant speed matching the average continuous consumpt.ion rate of yarn by the loom the occurrence rate of acceleration-deceleration drum phases whic~ tend to introduce sloughing or breakage of yarn is significantly decreased over prior art systems incorporating drum speed control. Thus, the present invention affords a more reliable long term yarn feeding system for controlling yarn tension to a loom while reducing problems of sloughing and breaking over a large range of yarn sizes and feed speeds.
Thus, brush 50 cooperates control means for the yarn being drawn off drum 16 by loom 10. The yarn is directed from nosepiece 48 through a guide 54, supported from a bracket 56 attached to a support frame 60 for the drum 16 and associ-ated parts, and then conveyed to loom 10. Drum 16 is heldstationary by means of a plurality of magnets 64 as yarn Y
is wound thereon and withdrawn therefrom, the drum 16 being supported from shaft 20 on ball bearings 66 and 68 positioned at its opposite ends to isolate it from the rotational move-ment of the shaft 20. For further particulars of the unit14 just described reference may be had to the prior cited Lawson patent.
As has already been stated in accordance with the present invention, drum 16 is driven by d-c electrical vari-ble speed motor 22. Other drive means such as gearing or adrive belt can be substituted as desired to give an appro-priate drum speed in response to the running speed of the 28 d-c motor ~2.
-` 1124818 A control system including the SCR phase control circuitry 70 establishes from the +20 volt d-c terminal 72 a varying d-c voltage at motor lead 74 for control of the motor speed as various load conditions are encountered, such S as the afore-mentioned intermittent tension load of the supply yarn Y when pulled from package 12 or the friction of the system upon cold startup, thereby assuring under all op~ra-ting conditions over long operating periods a matching of the speed of withdrawal of yarn Y from supply package 12 with con-sumption in loom 10.
In order to provide an adjustment for nominal motorspeed to match closely that desired for feeding yarn onto the drum 16 from supply package 12 at the same average rate at which it is withdrawn by loom 10, an RPM voltage control means 78 is made available for selective manual adjustment. This serves to establish the running speed setting from drum 16, which i5 thereafter maintained continuously constant by a feedback circuit comprising motor speed detector 80 and speed responsive voltage converter circuit 82. To further decrease system loading changes, detector 80 is preferably a contact-less magnetic Hall-effect type detector that senses the passing poles of a set of six rotating magnets 84 arranged on disc 86 rotated by the motor 22. Accordingly, the ~frequency to voltage~ converter circuit 82 senses an appro-priate frequency proportional to speed of motor 22 for con-version to a corresponding control voltage. This corrective control voltage, by medium of SCR phase control circuit 70 28 is established at a feedback magnitude tending to keep the 1124~18 d-c motor speed constant at the speed set by RPM voltage control means 7~ in the presence of changing load, voltage or other variable system conditions.
This constant speed operation of drum 16 serves to prevent frequent acceleration and deceleration phases that cause sloughing or breakage of the yarn Y being fed onto drum 1~ from supply package 12.
For proper operation of intermediate storage drum 16 the amount of yarn stored on drum 16 is sensed by a pivot-able ferrous member 90. This sensing is accomplished without additional friction or load, as is the motor speed, by mag-netic Hall-effect type detector 92 and operates whenever the supply of yarn on the drum becomes excessive by pivoting member 90 away from detector 92, or conversely. This actuates an on-off control circuit 94 for the d-c motor 22, to prevent overfilling of yarn on drum 16 for any reason such as stop-page of loom 10.
In operation therefore RPM vol~age control means 78 is set so that the speed of drum 16 is very close to but slightly exceeds that required to match the withdrawal of yarn from the drum by loom 10. The on-off control 94 there-fore need operate only infrequently or the purpose of routinely co,-recting yarn overfill so that the necessary acceleration-deceleration phases caused by motor shut down and restart are minimized to avoid the corresponding tension-ing and ballooning problems of withdrawal of yarn bailoon 9 from supply package 12 onto the drum 16.
28 As can be therefore understood except for these 48~8 infrequent deviations, in operation the drum 16 is driven at constant speed for continuously supplying yarn Y from supply package 12 onto the drum 16 at a rate matched with the average withdrawal rate at loom 10. Therefore, there is no change of drum speed in the routihe operation of the system.
The electrical control circuit configuration is set forth in the schematic circuit diagram of Figure 2, wherein the same reference characters are used for comparison of similar system elements.
Magnetic motor speed detector 80 is a Hall-effect device sensing the six magnetic poles per revolution of disc 86 in Figure 1 to provide an appropriate frequency of im-pulses into the input network 64 for processing in the fre-quency to voltage converter circuit 82. Circuit operating voltage ~12 volts d-c at terminal 100 as well as motor drive voltage +20V d-c at terminal 72 is supplied from a sùitable d-c supply not shown. All circuit parameters are shown and the various elements shown in block form are conventional commercially available units as hereinafter identified.
The resulting variable voltage output proportional to the actual drum rotation speed will appear on lead 104 for input control to terminal 106 of the SCR motor speed control circuit 70 in a magnitude that will adjust the speed of motor 22 to comper.sate for changes of loading, voltage, etc., en-countered in operation by control of the SCR device 110 in series with the motor 22 in the operating voltage supply path from terminal 72.
28 The motor speed signal derived from detector 80 is 11~4818 fed to a frequency-to-voltage converter circuit 82 which changes detector 80 output pulses to D. C. voltage. The level of this D. C. voltage is controlled by the voltage con-trol means 78 which establishes the nominal running speed of S motor 22 and is therefore set to match the rotation speed of the yarn drum 16 to coincide with the average consumption rate of yarn in the utility device as hereinbefore discussed.
The magnetic Hall-effect type detector 92 which ~enses the storage level of yarn on the drum 16 controls the transistorized electronic switch circuit 110 which serves by way of transistor 112 to selectively establish a sub-stantially ground voltage level at lead 105 thereby to pre-vent motor current flow through SCR device 110 and turn the motor off. In the preferred mode the motor is turned fully off so that ~he circuit is responsive to turn off the drum in response to yarn feeding failures, etc., and in addition performs the function of monitoring the drum storage capacity of drum 16 to assure that it is not overfilled. Only the over-fill capacity need be sensed for on-off drum control to per-form the storage monitoring function if the RPM control 78is set for a drum speed very slightly greater than that necessary to feed the utility device, and in this mode the number of changes of motor speed is minimized as compared with the prior art necessity to repetitively change drum speed and, therefore, to significantly increase the oppor-tunity for yarn ballooning and breakage.
Furthermore, this preferred embodiment has the 28 additional advantages of prGviding effective controls that --10_ 11248~8 do not in any way load the drum or yarn drive paths to up-set the delicate balances necessary for high speed trouble free yarn processing over long operating periods. This is effected by the electronic-magnetic sensing circuit em~odi-ment which furthermore is long-life without mechanical wear or electrical contact problems. Additionally, the sensing frequency parameters and electronic circuit time constants as established by the R-C networks therein are ideally suit-ed for fast response to the intermittent instantaneous load conditions encountered in removing yarn from a bobbin or from system friction, etc., that cannot be followed by mechanically operated sensing means or mechanically moved control members.
Although the circuit technology itself is conven-tional o~tside this particular system, and may take otherforms, the preferred embodiment which affords a combination of improved and co-acting operational features is constructed of the following commercially available component elements:
Motor 22 -- Model 12FP manufactured by Printed Motor Division Kollmorgen Corporation Glen Cove, New York Hall Effect -- Model UGN-3020T manufactured Detector 80 by Sprague Electric Company and 92 Concord, New Hampshire Frequency-to- -- Part No. RC4151NB manufactured Voltage Converter by Raytheon, Semi-Conductor DiV.
Integrated Circuit Mountain View, California 5 SCR Motor Speed O- Model No. L 120Bl manufacturcd by SGS - Ates Semiconductor Corporation Newtonville, Massachusetts 2~ It is clear, therefore, from the foregoing -lJ.-248~8 description of the invention and a preferred embodimentthereof that there is provided a new and improved system for controlling the tension and feeding conditions of yarn from a supply bobbin source to utility means such as a loom. By controlling the rotational speed of the intermediate storage drum-tensioning device to achieve a constant speed matching the average continuous consumpt.ion rate of yarn by the loom the occurrence rate of acceleration-deceleration drum phases whic~ tend to introduce sloughing or breakage of yarn is significantly decreased over prior art systems incorporating drum speed control. Thus, the present invention affords a more reliable long term yarn feeding system for controlling yarn tension to a loom while reducing problems of sloughing and breaking over a large range of yarn sizes and feed speeds.
Claims (22)
1. A strand feeding system between a strand supply and strand utility means such as a textile machine requiring strand to be fed at a substantially constant value comprising in combination, a drum feeding device receiving said strand from said supply and wrapping it about said drum for dis-charge thereafter to said utility means, a d-c variable speed drive motor for rotating said feeding device to thereby with-draw said strand from said supply at a rate determined by the rotating speed of said feeding device, speed control means programmed to establish a constant speed of said d-c motor in response to input feedback data, selectively adjustable voltage input means coupled to said speed control means establishing a strand feed rate substantially equal to said predetermined average value, feedback detector means deriving a signal proportional to the speed of rotation of said motor connected to maintain the motor speed at said predetermined value over changing load conditions by varying motor voltage and torque, whereby continuous rotation of said feeding de-vice is maintained to supply said strand to said utility de-vice at said average strand feed rate over relatively long periods of time thereby reducing drum feeding device acceler-ation and deceleration cycles and thereby reducing problems of sloughing and breakage of said strand.
2. A strand feeding system as defined in claim 1 wherein overload detection means provides input data to said speed control means for reducing the speed of said feeding device only to prevent accumulation of excess strand on said drum.
3. A strand feeding system as defined in claim 1 wherein said speed control means regulates the d-c volt-age to said motor.
4. A strand feeding system as defined in claim 3 wherein said feedback means derives a variable voltage in response to changes of speed effective to change the d-c voltage to said motor.
5. A strand feeding system as defined in claim 4 wherein contactless magnetic coupling provides said variable feedback voltage in response to changes in speed.
6. The method of controlling the rate of strand delivery between a strand supply and utility means consuming the strand at a substantially constant average strand rate comprising the steps of, operating a storage device to with-draw said strand from said strand supply, controlling said storage device at a substantially constant strand con-sumption rate to wind said strand thereon at a rate matching substantially said average constant rate of consumption of said utility means, and maintaining the storage device con-sumption rate constant by feedback regulating means respon-sive to the actual storage consumption rate.
7. The method of claim 6 wherein the step of operating the storage device at a substantially constant consumption rate is characterized by the further steps of driving the storage device with a d-c variable speed motor and controlling the voltage supplied to the motor to attain said constant consumption rate.
8. The method of claim 6 including the step of changing the drive torque imparted to said storage device as intermittent load variations are encountered by said storage device.
9. A strand feeding system between a strand supply and strand utility means such as a textile machine requiring strand to be fed at a predetermined average value during operation of said utility means comprising in combination, a feeding device including a drum, said drum being arranged to receive said strand from said supply and have it wrapped it about said drum for discharge thereafter to said utility means, a d-c variable speed drive motor for rotating said feeding device to thereby withdraw said strand from said supply at a rate determined by the rotating speed of said feeding device, said d-c motor being independent from said utility means, speed control means programmed to estab-lish a constant speed of said d-c motor in response to input feedback data, selectively adjustable voltage input means coupled to said speed control means establishing a strand feed rate substantially equal to said predetermined average value, feed-back detector means deriving a signal proportional to the speed of rotation of said motor connected to maintain the motor speed at said predetermined average value over changing load conditions by varying motor voltage and torque, whereby rotation of said feeding device is controlled to supply said strand to said utility device at said predetermined average value thereby reducing acceleration and deceleration cycles of said feeding device.
10. The method of controlling the rate of strand delivery between a strand supply and utility means consuming the strand at a substantially constant average strand rate comprising the steps of, operating a storage device by drive means indepen-dent of said utility means to withdraw said strand from said strand supply, controlling said drive means to thereby operate said storage device at a substantially constant strand consump-tion rate to wind said strand thereon at a rate matching substan-tially said average constant rate of consumption of said utility means, and maintaining the storage device winding rate constant by feedback regulating means responsive to the actual winding rate of said storage device.
11. The method of claim 10 wherein the step of operat-ing the storage device at a substantially constant winding rate by drive means is characterized by said drive means being a d-c variable speed motor and including the step of controlling the voltage supplied to the motor to attain said constant winding rate.
12. The method according to claim 10 including the steps of forming a balloon in the strand intermediate said supply and said storage device as said storage device is operated, stopping said storage device to prevent excess accumulation of strand thereon, and maintaining said balloon during intervals when said storage device is stopped due to excess strand accumulations on said drum.
13. A strand feeding device as set forth in Claim 2 wherein said feeding device is stopped to prevent excess accumu-lation of strand thereon, and wherein a balloon develops in said strand intermediate said supply and said drum as the strand is withdrawn from said supply by rotation of said feeding device, the rate of said withdrawal of said strand from said supply being sufficient to maintain said balloon during intervals when said drum is stopped due to excess strand accumulations on said drum.
14. A strand feeding system between a strand supply and utility means such as a textile machine requiring strand to be fed at a first predetermined average rate during operation of the utility means comprising, a feeding device arranged to receive said strand from said supply and have the strand wrapped thereon for discharge thereafter to said utility means, a balloon of strand being formed in the zone intermediate the strand supply and the feeding device during advance of the strand to the feed-ing device, a variable speed drive motor for operating said feed-ing device to withdraw said strand from said supply, an on-off circuit for controlling current flow to said motor to prevent excess accumulation of strand on said drum, speed control means programmed to establish a constant driven speed of said motor in response to input feedback data, selectively adjustable input means coupled to said speed control means to advance said strand from said supply to said feeding device at a second pre-determined average rate which is slightly higher than said first predetermined average rate, and detector means for sensing accumulation of strand on said feeding device and operable to activate said on-off circuit to interrupt current flow to said motor when the strand accumulation on said feeding device exceeds a preselected amount, said on-off circuit being operated at a frequency and duration to maintain said balloon during intervals when current flow to said motor is off.
15. A strand feeding system as set forth in claim 14 wherein said feeding device includes a stationary drum on which said strand is wound.
16. A strand feeding device as set forth in claim 14 wherein said drive motor is a d.c. motor.
17. A strand feeding system as set forth in claim 15 wherein the interval when the motor is off is less than time required to arrest operation of said feeding device to wind said strand onto said drum.
18. A strand feeding system as set forth in claim 14 wherein said drive motor is independent of said utility means.
19. A method for controlling strand delivery between a strand supply and utility means requiring said strand to be fed at a first substantially constant predetermined average rate comprising the steps of, operating a strand feeding device through electric drive means to advance the strand from said strand supply and wind said strand on said feeding device for discharge thereafter to said utility means, forming a balloon in said advancing strand intermediate said strand supply and said feeding device, controlling said drive means to operate said feeding device to withdraw said strand from said strand supply at a second substantially constant predetermined average rate which is slightly higher than said first predetermined average rate, detecting the accumulation of strand on said feeding device, interrupting the current flow to said drive means when the amount of strand on said feeding device exceeds a predetermined amount, and controlling the frequency and duration of said interruptions to maintain the balloon in said strand when the current flow is interrupted.
20. The method as set forth in claim 19 including the step of maintaining the feeding device winding rate constant by feedback regulating means responsive to the actual winding rate of said feeding device.
21. The method as set forth in claim 20 wherein the step of operating the feeding device at a substantially constant winding rate includes providing a d-c variable speed motor as the drive means, and including the step of controlling the voltage supplied to said d-c motor to attain said constant winding rate.
22. The method as set forth in claim 19 wherein said feeding device includes a drum upon which said strand is wound, and including the step of maintaining said drum against rotation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US95250178A | 1978-10-18 | 1978-10-18 | |
| US952,501 | 1978-10-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1124818A true CA1124818A (en) | 1982-06-01 |
Family
ID=25492971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA331,543A Expired CA1124818A (en) | 1978-10-18 | 1979-07-10 | Loom storage feeder improvement |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5557051A (en) |
| BE (1) | BE879457A (en) |
| CA (1) | CA1124818A (en) |
| CH (1) | CH644818A5 (en) |
| DE (1) | DE2934024A1 (en) |
| FR (1) | FR2439249A1 (en) |
| IT (1) | IT1124616B (en) |
| SE (1) | SE440066B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3031260A1 (en) * | 1980-08-19 | 1982-03-25 | Sobrevin Société de brevets industriels-Etablissement, Vaduz | DELIVERY DEVICE FOR RUNNING THREADS |
| JPS5953743A (en) * | 1982-09-16 | 1984-03-28 | 津田駒工業株式会社 | Multi-color free selecting apparaus of loom |
| DE3238375C1 (en) * | 1982-10-16 | 1983-12-29 | Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt | Device for measuring the thread length stored on a storage roller |
| JPS59125946A (en) * | 1982-12-27 | 1984-07-20 | 津田駒工業株式会社 | Multi-color freely exchangeable weft yarn storage apparatus for fluid jet type loom |
| JPS6016778U (en) * | 1983-07-11 | 1985-02-04 | 津田駒工業株式会社 | Weft length measuring device |
| DE3619097A1 (en) * | 1985-08-10 | 1987-02-19 | Sobrevin | THREAD DELIVERY DEVICE |
| DE3684286D1 (en) * | 1985-12-13 | 1992-04-16 | Tsudakoma Ind Co Ltd | Weft feeder for weaving machines. |
| JPH0410233Y2 (en) * | 1986-09-26 | 1992-03-13 | ||
| JPH05222649A (en) * | 1991-07-08 | 1993-08-31 | Tsudakoma Corp | Controller of motor for measuring length and storing |
| ITTO980520A1 (en) * | 1998-06-16 | 1999-12-16 | Lgl Electronics Spa | IMPROVEMENT OF YARN RESERVE SURVEILLANCE DEVICES IN WEFT FEEDING UNITS WITH WEAVING LOOMS. |
| JP2016013892A (en) * | 2014-07-02 | 2016-01-28 | 村田機械株式会社 | Yarn winder |
| CN105369463A (en) * | 2015-12-02 | 2016-03-02 | 苏州布舞佳乡纺织科技有限公司 | Rotary shaft transmission spinning yarn feeder |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH394899A (en) * | 1961-10-31 | 1965-06-30 | Sobrevin Soc De Brevets Ind Et | Apparatus for regulating the tension at the exit of a thread as it passes from its unwinding to its winding |
| GB1123734A (en) * | 1966-06-10 | 1968-08-14 | Ass Elect Ind | Electrical motor regulating arrangement |
| US3776480A (en) * | 1972-04-05 | 1973-12-04 | Lawson Hemphill | Yarn handling apparatus |
| US3796385A (en) * | 1972-05-24 | 1974-03-12 | Rosen K | Thread delivery method and apparatus |
| CH569655A5 (en) * | 1973-09-25 | 1975-11-28 | Sulzer Ag | |
| IT1049362B (en) * | 1975-03-10 | 1981-01-20 | Vella Spa R | CONSTANT VOLTAGE YARN FEEDER ADJUSTABLE PARTICULARLY FOR USE IN TEXTILE AND KNITWEAR MACHINES |
| US3977510A (en) * | 1975-06-23 | 1976-08-31 | Scm Corporation | Automatic function mechanism for typewriters |
-
1979
- 1979-07-10 CA CA331,543A patent/CA1124818A/en not_active Expired
- 1979-07-17 JP JP9088079A patent/JPS5557051A/en active Pending
- 1979-08-22 DE DE19792934024 patent/DE2934024A1/en not_active Withdrawn
- 1979-09-06 CH CH804079A patent/CH644818A5/en not_active IP Right Cessation
- 1979-09-25 FR FR7923805A patent/FR2439249A1/en active Granted
- 1979-10-17 SE SE7908572A patent/SE440066B/en not_active IP Right Cessation
- 1979-10-17 BE BE0/197680A patent/BE879457A/en not_active IP Right Cessation
- 1979-10-18 IT IT26593/79A patent/IT1124616B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| SE7908572L (en) | 1980-04-19 |
| SE440066B (en) | 1985-07-15 |
| IT1124616B (en) | 1986-05-07 |
| JPS5557051A (en) | 1980-04-26 |
| FR2439249A1 (en) | 1980-05-16 |
| CH644818A5 (en) | 1984-08-31 |
| BE879457A (en) | 1980-04-17 |
| FR2439249B1 (en) | 1984-09-14 |
| IT7926593A0 (en) | 1979-10-18 |
| DE2934024A1 (en) | 1980-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4226379A (en) | Loom storage feeder improvement | |
| CA1124818A (en) | Loom storage feeder improvement | |
| US4752044A (en) | Yarn supply apparatus with electronic yarn tension control, particularly for knitting machines having rapidly varying yarn supply requirements | |
| US6079656A (en) | Thread feed device for elastic yarn | |
| CZ102298A3 (en) | Thread feeding apparatus | |
| GB2158107A (en) | Yarn feeding apparatus for yarn-processing textile machines such as circular knitting machines | |
| JPS6242826B2 (en) | ||
| DE68902750D1 (en) | YARN DELIVERY DEVICE FOR TEXTILE MACHINES. | |
| US4687151A (en) | Textile yarn pull-off system | |
| US4799517A (en) | Weft yarn store for a loom | |
| US4292868A (en) | Textile spooling machine, an apparatus and method to prevent the formation of loose cut thread pieces | |
| US3433430A (en) | Fabric windup mechanism | |
| US4452402A (en) | Electric control for yarn feeding devices | |
| GB2069184A (en) | Strand feeding system | |
| EP0584099B1 (en) | Weft supplier for shuttleless looms | |
| US5166582A (en) | Drive arrangement of an open-end spinning machine | |
| JPS6357537B2 (en) | ||
| EP0004781A1 (en) | Method and apparatus for cone winding of yarn from a constant speed source | |
| US4368854A (en) | Yarn feeder motor control | |
| KR0140237B1 (en) | Thread feeder | |
| KR100375717B1 (en) | Method for Preliminary Storing Yarn and Feeding Device | |
| US5509450A (en) | Weft yarn feeding device having a rotating retainer | |
| US4942909A (en) | Weft-feeder with automatic adjustment of the delay time, for weft feeders of shuttleless looms | |
| CN217839269U (en) | Electronic yarn feeder | |
| KR840000320B1 (en) | Apparatus for controlling a thread storage and feeder device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |