EP1043435B9 - Loom with a device to control the speed of rotation of the main motor in the weaving loom and method to control the speed of the rotation of the main motor in a weaving loom - Google Patents

Loom with a device to control the speed of rotation of the main motor in the weaving loom and method to control the speed of the rotation of the main motor in a weaving loom Download PDF

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Publication number
EP1043435B9
EP1043435B9 EP99116571A EP99116571A EP1043435B9 EP 1043435 B9 EP1043435 B9 EP 1043435B9 EP 99116571 A EP99116571 A EP 99116571A EP 99116571 A EP99116571 A EP 99116571A EP 1043435 B9 EP1043435 B9 EP 1043435B9
Authority
EP
European Patent Office
Prior art keywords
speed
loom
motor
section
starting
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 - Lifetime
Application number
EP99116571A
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German (de)
English (en)
French (fr)
Other versions
EP1043435B1 (en
EP1043435A3 (en
EP1043435A2 (en
Inventor
Corrado Volpi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Promatech SpA
Original Assignee
Promatech SpA
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Filing date
Publication date
Application filed by Promatech SpA filed Critical Promatech SpA
Publication of EP1043435A2 publication Critical patent/EP1043435A2/en
Publication of EP1043435A3 publication Critical patent/EP1043435A3/en
Application granted granted Critical
Publication of EP1043435B1 publication Critical patent/EP1043435B1/en
Publication of EP1043435B9 publication Critical patent/EP1043435B9/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/007—Loom optimisation
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/002—Avoiding starting marks

Definitions

  • the present invention refers to a device and a method for controlling the revolving speed of the main motor of a loom during the sudden shift from a rest to a steady state, which takes place when the movable parts of the loom start their motion and then reach the weaving speed.
  • the final quality of a fabric also depends on the fact that the working speed of the loom is as uniform as possible. Speed transients, during the weaving, can produce even a lightly different quality of the fabric, which can all the same be noticed by an expert in the art, especially in the connecting area of two fabric lengths woven at different speed.
  • This problem is indeed quite common in the ordinary manufacturing, in particular due to the possible weaving defects (broken or short weft, breaking of the warp yarns and so on) which cause automatic stops of the loom.
  • a first motor section of the loom - which essentially includes a main motor of the loom and a flywheel - is separated, through a main clutch group, from a second weaving section of the loom - which includes a sley with relative reed, a weave forming machine with its heald frames and, in case, grippers for the insertion of the weft - allowing, in this way, the stopping of this second section of the loom in order to execute the desired repairing operations.
  • the loom can be restarted by engaging the clutch group and so connecting said first section, which has been kept at the steady speed, to said second section of the loom, now in a rest state.
  • a transient of speed of the loom is unavoidable, with a temporary lowering of the speed at a value lower than the steady speed, due to the inertia of the rest section of the loom, said speed reduction leaving therefore a visible mark on the fabric being woven.
  • the above inverter device accomplishes therefore a twofold task, allowing on one hand the optimisation of the transient curve and offering, on the other hand, a large number of steady speeds, without operating on mechanical gear ratios of the loom .
  • said device can be easily integrated in the software system of the loom, and easily programmed and controlled as a function of a larger and larger range of variables, both technical and environmental, which can influence the weaving process.
  • the inverter device is a sophisticated and expensive kind of device, which - even if appreciated because it is apt to fit, in an efficient way, a large number of different weaving conditions - it cannot be used in all the situations.
  • the weaving mass-production wherein the weaving takes place according to well defined and unchanged standard conditions, there is the demand of a device ad hoc - for solving the problem relative to the starting transient of the loom - simpler than the inverter, so as to be more reliable and economic of this latter, and all the same apt to allow a satisfactory reduction of the length of the starting transient of the loom.
  • Aim of the present invention is therefore to offer a device and a method for controlling the working speed of a loom during the starting transient thereof, having a low cost and high efficiency, strength and reliability.
  • the aim is reached, according to the present invention, through a device for controlling the working speed of a loom, during its starting run - said loom being formed by a first section, essentially including a main motor and a flywheel, and a second section, including at least a sley and a weave forming machine, connected to said first section through a main clutch group - wherein said first section of the loom, rotating at a predetermined launching speed higher than the steady speed of the loom, is connected through the main clutch group to said second section of the loom, in a rest state, characterised in that said main motor is a double-speed motor, a first lower speed being equal to said steady speed of the loom and a second higher speed being equal or higher than said launching speed.
  • the invention also concerns a method for controlling the working speed of a loom, which provides, during the starting run of the loom, the following subsequent steps:
  • Fig. 1 shows the working principles thereof.
  • the main motor M of the loom is an electric motor with two windings M1 and M2, separately supplied by the power supply A, through circuits 1 and 2.
  • motor M is apt to develop two different and predetermined steady revolving speeds V1 and V2; for the sake of brevity, in the following, said motor will be simply defined as double-speed motor.
  • the double-speed motor M is designed in order to have its lower speed V1 corresponding to the standard steady speed of the loom, and its second speed V2, higher than speed V1, being equal or higher than the highest value of speed which could be desired from motor M during the starting run of the loom.
  • the increase of speed of the loom in respect of the speed V1 is set according to the inertial features of the weaving section T of the loom downstream of the main clutch F, which section, as widely known, comprises a sley and relative reed, a weave forming machine and relative driven heald frames, and finally, in case of a gripper loom, carrying and drawing grippers.
  • the setting operation must result in the fact that the additional momentum of the motor section of the loom, deriving from said overspeed Vs, must be as equal as possible, in absolute value, to the momentum necessary to start the above said section T of the loom downstream of the clutch F, at the speed V1. In this way, in fact, the motor M brought to the launching speed V1 + Vs is slowed down exactly to the speed V1 in a very short time, which is the same time necessary to the complete engagement of the clutch F.
  • the value of the overspeed Vs - considering that the double speed motor M doesn't have in itself any speed control device - according to the present invention said motor should be combined to a rotation angle meter device E.
  • Said device is in turn connected to a processing central unit C, which is usually already provided on the loom for the general working of the loom itself.
  • a specific board of said unit is apt to convert the instantaneous measure of the rotation angle of the motor M, provided by the meter device E, in a measure of instantaneous speed and thereafter to compare said last measure with the predetermined value of the launching speed V1 + overspeed Vs.
  • the processing unit C gives the consent to the circuit 2 of the power supply A and the motor M starts to increase its speed from V1 to V2, according to a variation law which is constantly controlled by the unit C according to a feedback closed ring control model, as described heretofore.
  • the unit C operates the engagement of clutch F and, in the same time, disables the circuit 2 of the power supply M, keeping the power supply only on circuit 1.
  • Said above predetermined value of overspeed Vs can be manually set by the operator, on the control keyboard of the unit C, on the basis of former experimental data.
  • said value should be automatically calculated by the central processing unit C.
  • said unit provides to store data relative to the values of the overspeed Vs and the trend of n preceding transients, and to process said data through an appropriate algorithm, so as to calculate a value of overspeed Vs apt to minimise the duration of transient n + 1.
  • said duration is lower than the length of time of a single weft insertion cycle. In the present looms, working at a speed of about 600-1000 cycles per minute, this means a duration of the transient lower than 6-10 hundredth of a second.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP99116571A 1999-04-01 1999-08-24 Loom with a device to control the speed of rotation of the main motor in the weaving loom and method to control the speed of the rotation of the main motor in a weaving loom Expired - Lifetime EP1043435B9 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI990687 1999-04-01
IT1999MI000687A IT1312165B1 (it) 1999-04-01 1999-04-01 Dispositivo e metodo di controllo della velocita' di rotazione delmotore principale di un telaio di tessitura.

Publications (4)

Publication Number Publication Date
EP1043435A2 EP1043435A2 (en) 2000-10-11
EP1043435A3 EP1043435A3 (en) 2001-08-22
EP1043435B1 EP1043435B1 (en) 2006-04-05
EP1043435B9 true EP1043435B9 (en) 2007-08-01

Family

ID=11382569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99116571A Expired - Lifetime EP1043435B9 (en) 1999-04-01 1999-08-24 Loom with a device to control the speed of rotation of the main motor in the weaving loom and method to control the speed of the rotation of the main motor in a weaving loom

Country Status (5)

Country Link
EP (1) EP1043435B9 (it)
AT (1) ATE322566T1 (it)
DE (1) DE69934151T2 (it)
ES (1) ES2262277T3 (it)
IT (1) IT1312165B1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102212916A (zh) * 2011-05-30 2011-10-12 苏州华毅机械有限公司 提花机与喷水织机的数字同步动力系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3542650A1 (de) * 1985-12-03 1987-06-04 Stromag Maschf Verfahren und vorrichtung zur steuerung und/oder regelung des anfahrvorganges einer webmaschine
DE3733590A1 (de) * 1986-12-27 1988-07-07 Dornier Gmbh Lindauer Verfahren und schaltungsanordnung zum anwerfen von mit einem elektrischen hauptantrieb ausgeruesteten webmaschinen
DE3921318A1 (de) * 1989-06-29 1991-01-10 Dornier Gmbh Lindauer Verfahren zum anwerfen einer webmaschine
US5172732A (en) * 1989-06-29 1992-12-22 Lindauer Dornier Gesellschaft Mbh Method for starting a power loom as a function of standstill time
DE19914131A1 (de) * 1999-03-27 2000-10-05 Dornier Gmbh Lindauer Verfahren zum Anwerfen von mit einem elektromotorischen Hauptantrieb ausgerüsteten Webmaschinen

Also Published As

Publication number Publication date
ATE322566T1 (de) 2006-04-15
ITMI990687A1 (it) 2000-10-01
ES2262277T3 (es) 2006-11-16
EP1043435B1 (en) 2006-04-05
EP1043435A3 (en) 2001-08-22
EP1043435A2 (en) 2000-10-11
IT1312165B1 (it) 2002-04-09
DE69934151T2 (de) 2007-03-01
DE69934151D1 (de) 2007-01-04

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