US3680602A - Looms for weaving - Google Patents

Looms for weaving Download PDF

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Publication number
US3680602A
US3680602A US14552A US3680602DA US3680602A US 3680602 A US3680602 A US 3680602A US 14552 A US14552 A US 14552A US 3680602D A US3680602D A US 3680602DA US 3680602 A US3680602 A US 3680602A
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US
United States
Prior art keywords
loom
switch
auxiliary
speed
motor
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
US14552A
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English (en)
Inventor
Thomas Hindle
Vincent Pinder Banks
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Hindle Son and Co Ltd
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Hindle Son and Co Ltd
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Publication date
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/385—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
    • 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
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/005—Independent drive motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/385—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
    • G01R33/3858—Manufacture and installation of gradient coils, means for providing mechanical support to parts of the gradient-coil assembly
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/483—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
    • G01R33/485—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy based on chemical shift information [CSI] or spectroscopic imaging, e.g. to acquire the spatial distributions of metabolites

Definitions

  • ABSTRACT Jaudon Attorney-Roberts, Cushman & Grover
  • This invention relates to looms for weaving and more particularly to the control of dobbies and box-motions which are powered by electric motors separately from the main electric motor employed to drive the loom.
  • the motors so selected and energized are normally stopped by their limit-switches opening upon their respective gearwheels completingtheir required halfrevolution, whereby the desired positional change of heaId-shaft or shuttle-box is thenceforward efiected by means of cranks or equivalent eccentrics or cams.
  • the main motor employed to drive the loom may be started and stopped to start and stop the loom. More usually, however, the main motor runs continuously and drives the loom through some form of friction clutch, such as a conventional electro-magnetic clutch as shown in FIG. 3.
  • the loom may be stopped at any position in the loom cycle, and it is apparent that when the loom is brought to rest either by stopping its motor or by releasing the driving clutch (and usually by the application of supply simultaneously brake) the several independent electric motors employed to power the dobby shedding motion and/or the box-motion must simultaneously be de-energized, and their normal running operations thereby interrupted.
  • the object of this invention therefore is to provide means whereby, after the loom and its electric dobby and/or box-motion have been stopped as above described, and the loom is re-started to re-commence weaving, the electric current serving to energize the independently-driven dobby and/or box-motion is not restored until after the loom itself has substantially attained its normal running speed.
  • a speed-sensitive switch is driven from any convenient shaft of the loom, such as the crankshaft.
  • This switch is arranged to control the current supply to the dobby or other auxiliary, so ensuring that these auxiliaries are not energized until the loom crankshaft has substantially attained its normal running speed.
  • the employment of this device effectively synchronizes the action of the electric dobby and any other relevant auxiliary with the loom crankshaft during each re-starting operation, and ensures uniform cloth under all running and re-starting conditions.
  • FIG. 1 is a circuit diagram of one form of electric dobby, showing only the components required for actuating one heald-shaft, but including a speed-sensitive switch S in accordance with the invention;
  • FIG. la diagrammatically illustrates a conventional electromagnetic clutch
  • FIG. 2 is a modification of the timing switch for use when the main motor employed to drive the loom crankshaft is adapted to be reversed for the purpose of unweaving faulty cloth;
  • FIG. 3 is a diagrammatic perspective view, from behind, a loom dobby constructed in accordance with this invention.
  • each heald-shaft is actuated by its own electric motor, such as MI, comprises a number of such motors each of which is provided with an automatic brake 2.
  • Each motor drives through speed-reducing gears indicated by gear-box 3 and spurgears 40 and 4b, and runs intermittently for a fraction (about one-half) of the time occupied by one loom cycle or crankshaft revolution.
  • the motors, such as Ml, next to be energized are first selected by a series of two-way pattern-switches, such as P1 (with contacts 8 and 9), actuated by a stepby-step patterning device indicated at D, in combination with a corresponding number of two-way limitswitches, such as Ll (with contacts 10 and ll), each such limit-switch being actuated by a cam 7 compounded and rotating with the gearwheel 4b, which, under its own motor-power, rotates a half-revolution at a time and then stops promptly under automatic braking action.
  • a series of two-way pattern-switches such as P1 (with contacts 8 and 9)
  • a stepby-step patterning device indicated at D in combination with a corresponding number of two-way limitswitches, such as Ll (with contacts 10 and ll)
  • each such limit-switch being actuated by a cam 7 compounded and rotating with the gearwheel 4b, which, under its own motor-power, rotate
  • Timing-cam 13 which operates the timing-switch T rotates at the speed of the loom crankshaft, and the cam-lobe extends over about 240 of its circumference.
  • the motor so selected and energized are normally stopped by their respective limit-switches, Ll etc.,
  • limit-switch cam 7 For the particular form of limit-switch cam 7 shown, by way of example, in FIG. 1, the cam-lobes extend over nearly one-half of their circumference, whereby they change-over their two-way limit-switches after each half-revolution.
  • the main motor, LN, employed to drive the loom may be started and stopped tostart and stop the loom crankshaft.
  • the main motor serves to energize a main contactor coil LC, whereupon contacts-20, 21 and 22 close-to start the main motor LM, thereby driving the loom crankshaft. More usually, however, the main motor runs continuously during normal weaving and drives the loom crankshaft through some form of friction clutch, such as the electro-magnetic clutch illustrated in FIG. 3. In such variation, the" clutch is similarly energized by closure of the hand-switch 23,.thereby settingthe loom crank-shaftinto motion. If preferred, push-button control may be readily substituted for the hand-switch 23 in a, manner well-known in the art.”
  • heald shaft motors attain their operating speed more quickly than the loom crankshaft when restarted under load and this more rapid build-up can manifest'itself as a cloth fault or give rise to other difficulties'if the restarting occurs at a particularstage in the loom cycle since the timing relationship between the various loom operations will be upset.
  • a speed sensitive switch S which switch is driven from any convenient shaft of the loom, such as the crankshaft, connected in series with the timing-switch T, and therefore in series with any number of contactor coils, such as C1, C2, which themselves are connected in parallel.
  • the speed-sensitive switch S which may be of any commercially available construction, is thus adapted to control the current supply to the electric dobby, or other auxiliary, so ensuring that these independently powered auxiliaries-are not energized until the loom crankshaft has substantially attained its normal running speed.
  • the contacts of the'switch S close either when rotation commences or at any speed up to the full speed of the loom, as may be found mosteffective.
  • the switch assumes an open circuit condition in the event of a reduction in the rotational speed of the loom crank shift, as during stopping of the loom.
  • the employment 1 of this device effectively synchronizes the action of the electric dobby, and any other independently driven auxiliary, with the loom crankshaft during each re-startingoperation, and ensures uniform cloth under all running and re-starting conditions.
  • the speed-sensitive switch S responds automatically 3 to any difference in the torque required to accelerate the crankshaft when starting under the varying load conditions encountered in weaving a range of industrial fabrics.
  • the heald-shafts are actuated by one or more electric motors which run continuously but independently of the main loom motor.
  • Electric clutches are employed to transmit power therefrom for the purpose of rotating a series of crankwheels or cams, each of which actuates one heald-shaft.
  • crankwheels or cams rotate a half-revolution at a time under the combined control of pattern and limitswitches in the manner described in our co-pending Application aforesaid.
  • the electric clutches employed in the above modification are simultaneously controlled by a speed-sensitive switch, with precisely the self-same object and effect.
  • a loom and main motor for driving the same said loom having an electric dobby motion for the selective actuation according to a predetermined pattern sequence of at least one electrically driven auxiliary and wherein each such auxiliary is provided with a respective drive means separate from said main electric motor employed to drive the loom and operable under the control of a pattern means and timing switch means, characterized by a speed sensitive switch driven from a loom shaft and adapted to control the current supply to the drive means for the respective auxiliaries thereby selectively to apply a drive to such auxiliaries in accordance with the pattern sequence aforesaid, the speed-sensitive switch serving to ensure that the auxiliaries are not energized until the loom shaft has attained a predetermined running speed.
  • each auxiliary comprises a continuously driven motor and an electromagnetic clutch means for drivingly connecting such motor to the respective auxiliary, the speed-sensitive switch being operable to control the current supply to the clutch means.
  • a loom according to claim 1 wherein an additional timing switch means is provided to control the operation of the drive means of each auxiliary on operation of the loom in a reverse direction, a manually actuable change-over switch being provided for use on loom reversal.
  • a loom according to claim 3 wherein the additional timing switch means comprises a timing switch and a respective timing-cam therefore.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Looms (AREA)
US14552A 1969-02-26 1970-02-26 Looms for weaving Expired - Lifetime US3680602A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1015969 1969-02-26

Publications (1)

Publication Number Publication Date
US3680602A true US3680602A (en) 1972-08-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
US14552A Expired - Lifetime US3680602A (en) 1969-02-26 1970-02-26 Looms for weaving

Country Status (7)

Country Link
US (1) US3680602A (enrdf_load_stackoverflow)
AT (1) AT306658B (enrdf_load_stackoverflow)
BE (1) BE746583A (enrdf_load_stackoverflow)
DE (1) DE2008470A1 (enrdf_load_stackoverflow)
FR (1) FR2041056A1 (enrdf_load_stackoverflow)
GB (1) GB1234001A (enrdf_load_stackoverflow)
NL (1) NL7002424A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5228480A (en) * 1991-05-13 1993-07-20 Tsudakoma Kogyo Kabushiki Kaisha Pick finding apparatus for electric motor driven heald frames
WO2002034982A3 (de) * 2000-10-26 2003-05-08 Dornier Gmbh Lindauer Verfahren zum betreiben einer web- und fachbildemaschine
WO2004020717A1 (de) * 2002-08-07 2004-03-11 Lindauer Dornier Gesellschaft Mbh Verfahren zum betreiben einer web- und einer fachbildemaschine bei separaten antrieben

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787290A (en) * 1954-06-24 1957-04-02 F C Huyck & Sons Picking mechanism for looms
US3192957A (en) * 1963-10-15 1965-07-06 Continental Elastic Corp High speed pattern changer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787290A (en) * 1954-06-24 1957-04-02 F C Huyck & Sons Picking mechanism for looms
US3192957A (en) * 1963-10-15 1965-07-06 Continental Elastic Corp High speed pattern changer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5228480A (en) * 1991-05-13 1993-07-20 Tsudakoma Kogyo Kabushiki Kaisha Pick finding apparatus for electric motor driven heald frames
WO2002034982A3 (de) * 2000-10-26 2003-05-08 Dornier Gmbh Lindauer Verfahren zum betreiben einer web- und fachbildemaschine
US20040031533A1 (en) * 2000-10-26 2004-02-19 Valentin Krumm Method for operating a weaving and shedding machine
US6953063B2 (en) 2000-10-26 2005-10-11 Lindauer Dornier Gesellschaft Mbh Method for operating a weaving and shedding machine
WO2004020717A1 (de) * 2002-08-07 2004-03-11 Lindauer Dornier Gesellschaft Mbh Verfahren zum betreiben einer web- und einer fachbildemaschine bei separaten antrieben
RU2288309C2 (ru) * 2002-08-07 2006-11-27 Линдауер Дорнир Гезелльшафт Мбх Способ эксплуатации ткацкого станка и зевообразовательного механизма с отдельными приводами
CN100585043C (zh) * 2002-08-07 2010-01-27 林道尔·多尼尔有限责任公司 在单独驱动装置下的织机和开口机的工作方法

Also Published As

Publication number Publication date
NL7002424A (enrdf_load_stackoverflow) 1970-08-28
DE2008470A1 (de) 1970-09-17
GB1234001A (enrdf_load_stackoverflow) 1971-06-03
AT306658B (de) 1973-04-25
BE746583A (fr) 1970-07-31
FR2041056A1 (enrdf_load_stackoverflow) 1971-01-29

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