US2196893A - Weft straightening apparatus - Google Patents

Weft straightening apparatus Download PDF

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Publication number
US2196893A
US2196893A US227148A US22714838A US2196893A US 2196893 A US2196893 A US 2196893A US 227148 A US227148 A US 227148A US 22714838 A US22714838 A US 22714838A US 2196893 A US2196893 A US 2196893A
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US
United States
Prior art keywords
strip
weft
motor
lack
straightness
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
US227148A
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English (en)
Inventor
Theodore M Berry
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General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US227148A priority Critical patent/US2196893A/en
Priority to DE1939L0098907 priority patent/DE702121C/de
Priority to GB24709/39A priority patent/GB533924A/en
Application granted granted Critical
Publication of US2196893A publication Critical patent/US2196893A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06H—MARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
    • D06H3/00—Inspecting textile materials
    • D06H3/12—Detecting or automatically correcting errors in the position of weft threads in woven fabrics
    • D06H3/125—Detecting errors in the position of weft threads

Definitions

  • My invention relates to the manufacture of through a slot 6 and by dotted lines at each side woven material, such as woven fabrics, where it is desirable that the finished material shall be straight, that is, that there shall not be any skew or bow in the weft elements thereof.
  • the object of my invention is to provide improved apparatus for straightening'woven material whether the lack of straightness therein is due to the material being either skewed or bowed or being both skewed and bowed and whether the lack of straightness exists throughout the entire width of the material or is present in only' fa certain portion thereof.
  • Fig. 1 is a perspective view of apparatus embodying my invention
  • Fig. 2 is a detail of a portion thereof
  • Fig. 3 shows one of the optical systems forming a part thereof
  • Fig. 4 shows a portion of the material requiring straightening together with a part of the one optical system
  • Fig. 5 is a circuit diagram of the apparatus.
  • the strip of material to be straightened is shown at i arranged to be drawn along longitudinally by being wrapped around the roll 2 having driving means, not shown, the strip as it approaches the roll passing over the idler rolls 3 and 4.
  • I project therethrough a transversely moving narrow beam of light which: is successively intercepted by the weft members of the material and the resulting interruption of this beam of light by the weft members produces impulses the frequency of which is used to detect any lack of straightness in the weft members, such as may result from the presence of skew or bow in the material, and to control mechanism for correct ing such lack of straightness.
  • the apparatus comprises the ro tatablc disc 5 having therein a plurality of equally spaced radial slots 6, the disc being directly mounted on the shaft of the electric motor 7:.
  • the optical system 8 Adjacent to the motor is the optical system 8 which comprises the light source 9, such asa small electric lamp, the light from which is focussed by the condensing lens ill and the cylindrical lens Ii into a narrow beam on the disc 5 which disc ⁇ it will be understood, is arranged close beneath the strip i.
  • the condensing lens l2 and the photo-electric device 13 such for example as a photo-electric tube.
  • the narrow light beam re resented at 15 by a single black line as seen thereof extends transversely of the strip and the warp members thereof.
  • the number of interruptions of the light beam will be of a certain value. If, however, the weft members are inclined in one direction, such for example as shown in Fig. 4, the number of interruptions of the light beam due to the passage of each slot 6 will be decreased. Conversely, if the weft members are inclined in the opposite direction the number of interruptions will be increased.
  • the frequency output of the photoelectric device I3 will have a certain definite value but if there is skew or how in the material the frequency of the output will be increased or decreased in accordance with the character of the skew or bow and also the amount of increase or decrease in the frequency will be a measure of the amount of the skew or bow.
  • the weft elements of the material successively to interrupt another light beam which is stationary.
  • This second light beam is produced by a suitable source such as a small electric lamp i8 whose light is focused by means of the condensing lens l9 and the cylindrical lens 20 into a narrow beam extending transversely of the warp elements of the strip like that produced by the optical system 8.
  • a suitable source such as a small electric lamp i8 whose light is focused by means of the condensing lens l9 and the cylindrical lens 20 into a narrow beam extending transversely of the warp elements of the strip like that produced by the optical system 8.
  • the condensing lens 2! onto the photoelectric device 22 which may be a photoelectric tubc like the device I 3.
  • the output of the device 22 will have a frequency corresponding with the number of weft elements passing a fixed point.
  • any lack of straightness in the strip of material is detected by a comparison of the output frequency of the devices i3 and 22.
  • the presence of skew or bow in the strip not only is detected but mechanism for correcting such a condition is controlled.
  • the optical system 8 is caused to reciprocate back and forth continually across the strip whereby various transverse portions thereof are examined for any lack of straightness.
  • I have provided two transversely movable carriages one shown at 24 below the strip arranged to slide on the stationary transverse guides 25 and the other shown at 26 above the strip arranged to slide housing 3! which contains the amplifier for the photoelectric device. These two carriages arecaused to travel back and forth across the strip in unison by means of the two shafts 33 and 34 each having reverse threads or grooves cut there in which are engaged by followers carried by the respective carriages.
  • the shafts 33 and 34 are geared together by the spur gearing 35 and are arranged to be driven from the drum 2 by means of the countershaft 36 and suitable bevel gearing at the ends thereof.
  • the two carriages are caused to travel back and forth in unison across the strip with a speed which is proportional to the rate of movement of the strip. While the carriages thus travel across the strip, the apparatus automatically detects any skew or how that may exist in the strip as a whole or in any local transverse portion thereof.
  • is the caster 38 having the rubber roller 39 adapted I to squeeze the material against the lower plate 28 wheel 44. This wheel is threaded on the screw 45 engaging the spring and is retained against longitudinal movement in the carriage by the spline and pin connection 46.
  • the apparatus by which the frequency output of the two photoelectric devices l3 and 22 are compared, represented diagrammatically by Fig. 5, is like that disclosed by Fig. 6 in the abovementioned La Pierre Patent 2,106,611 in that I employ a main capacitor 54 which is given a charge of one polarity or the other from the auxiliary capacitors 63 and 65 in accordance with the relative frequency output of the two photoelectric devices.
  • the auxiliary capacitors are kept charged from the source of direct current supply 6!.
  • the apparatus which I employ for thus charging the capacitor 64 and which I have shown in Fig. 5 is identical with that disclosed in the aforesaid patent, I shall omit a detailed description of such apparatus herein. B the apparatus which I shall now describe.
  • the motor is provided with the two opposed field windings "HI and H which are included respectively in the anode circuits of the vapor electric discharge devices 12 and 13,
  • circuits which circuits are supplied with alternating current from the secondary 14 of the transformer 15, the armature of the motor being connected in series therewith.
  • the primary of the transformer may-be supplied from any suitable source.
  • the grid circuits of the discharge devices 12 and 13 are supplied from across the resistors 68, which with the resistor 66 form a voltage divider across the capacitor 64.
  • the grids are also supplied with phase-displaced voltage obtained from the secondary winding Hi of transformer 15 through the phase displacing network 11 which is of well known construction.
  • the speed of the motor 42 is substantially proportional to the tangent of the angle of inclination of the weft elements of the strip from their normal perpendicular relation. Then since the force tending to retard any portion of the strip bears a direct relation to the pressure exerted thereon by the roller, the combinationof the motion of the roller across the strip and the rotation of the motor 42 will cause a correcting force to be applied to the strip which is proportional to the displacement of the weft elements away from the straight or normal position thereof.
  • the strip l is drawn along in the direction indicated by the arrow by means of the driving roll 2.
  • the two carriages travel simultaneously back and forth across the strip thereby scanning all parts thereof between its two edges.
  • the interruption of the light beam of the optical system 8 and hence the output frequency of the photo-electric device l3 will have a fixed and definite value. If, however, the strip is skewed or bowed the frequency will be greater or less than before depending upon the direction of the inclination of the weft elements. Also the amount of change in the frequency will depend upon the degree of the inclination.
  • the output frequency of the device 22 remains fixed since it depends only upon the speed of the strip.
  • the amount of such charge is a measure of the amount of the inclination.
  • the motor 42 by which a variable drag is applied to oppose the movement of a portion of the strip is controlled by the discharge devices 12 and 13 in accordance with the charge on the main capacitor.
  • the discharge devices 12 and 13 in accordance with the charge on the main capacitor.
  • means for moving a strip of woven material longitudinally and means arranged to cooperate therewith for detecting any lack of straightness in the weft members of said material comprising fixed means for producing impulses in response to the passage thereby of the weft elements of the material, transversely movable means for producing impulses in response to the passage thereby of the weft elements and a device operable in response to a difference in the frequencies of said impulses.
  • means for moving a strip of woven material longitudinally fixed means for producing an impulse frequency in response to the passage thereby of the weft elements of the material, means movable transversely of the strip for producing an impulse frequency in response to the passage thereby of said weft elements and means responsive to a difierence in said impulse frequencies for straightening the weft elements of said material.
  • means for moving a strip of woven material longitudinally means for illuminating portions of said strip, a plurality of photoelectric devices arranged each to receive a narrow beam of light from one of said illuminated portions and rendered pulsating by the weft members of the material, one of said beams being stationary, means for moving the other of said beams transversely of the strip simultaneously with the longitudinal movement thereof and straightening means responsive to a dinerence in the output frequencies of said devices.
  • means for moving a strip of woven material longitudinally means for illuminating said strip, a plurality of photoelectric devices each arranged to receive light in a narrow beam from said strip whereby the passage of the successive weft elements of the material produce impulses in the received light, means for holding one of said devices in a fixed position, means for moving another of said devices transversely of said strip and means movable transversely of the strip for straightening the weft elements thereof in response to a difference in the output frequencies of said devices.
  • means for moving a strip of woven material longitudinally means for de-- tecting a lack of straightness in the Weft elements of said material successively at various different transverse portions thereof and straightening means for said elements operable with a variable effect at said portions of the material in accordance with the lack of straightness detected thereat.
  • means for moving a strip of woven material longitudinally means movable across said strip for detecting a lack of straightness of the weft elements therein and straightening means for said elements operable with a variable eifect at different transverse portions of the strip in accordance with the lack of strai htness detected at said portions.
  • means for moving a strip of woven material longitudinally means movable across said strip for detecting a lack of straightness of the weft elements thereof and straightening means for said elements movable across said strip and constructed to produce a variable effect at different transverse portions thereof in response to the amount of the detect-ed lack of straightness at said portions.
  • a drum arranged to engage and move a strip of woven material longitudinally and straightening means therefor comprising means for impeding the longitudinal movement of the strip at one point thereof, means for causing said point to move across the strip and means for varying the effect of said impeding means.
  • a drum arranged to engage and move a strip of woven material longitudinally and straightening means for the weft elements thereof comprising a plate over which said strip moves, means movable transversely of the strip for pressing a portion of the strip against the plate to impede its movement and means for varying the pressure exerted by said pressing means.
  • a drum arranged to engage and move a strip of woven material longitudinally and straightening means for the weft elements thereof comprising a plate over which said strip moves, means for moving said plate transversely of the strip and means movable with said plate for variably pressing the material against it.
  • a drum arranged to engage and move a strip of woven material longitudinally, means for detecting a lack of straightness in the weft elements of the material at a point which moves across the strip, means for impeding the longitudinal movement of the strip at a part thereof adjacent said point and means responsive to said detecting means for varying said impeding means.
  • a drum arranged to engage and move a strip of woven material longitudinally, means including a photoelectric device movable across said strip for detecting a lack of straightness of the weft elements in the successive transverse portions of the strip, a plate on one side of the strip, a roller on the other side thereof movable with and arranged adjacent to said device and means responsive to said detecting means for variably pressing the strip between the plate and the roller.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Looms (AREA)
US227148A 1938-08-27 1938-08-27 Weft straightening apparatus Expired - Lifetime US2196893A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US227148A US2196893A (en) 1938-08-27 1938-08-27 Weft straightening apparatus
DE1939L0098907 DE702121C (de) 1938-08-27 1939-08-27 ewebter lichtdurchlaessiger Stoffbahnen fuer Spannrahmen oder aehnliche Maschinen
GB24709/39A GB533924A (en) 1938-08-27 1939-08-28 Improvements in and relating to weaving machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US227148A US2196893A (en) 1938-08-27 1938-08-27 Weft straightening apparatus

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US2196893A true US2196893A (en) 1940-04-09

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US227148A Expired - Lifetime US2196893A (en) 1938-08-27 1938-08-27 Weft straightening apparatus

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US (1) US2196893A (de)
DE (1) DE702121C (de)
GB (1) GB533924A (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2623262A (en) * 1951-03-22 1952-12-30 Gen Electric Weft straightener
US2737700A (en) * 1952-02-19 1956-03-13 Tubular Textile Machine Corp Stripe matching machine
US2962596A (en) * 1958-10-01 1960-11-29 Leimer Albert Control system for the contactless scanning of textile webs and like sheet material
US2966593A (en) * 1957-04-02 1960-12-27 Leimer Albert Method and apparatus for inspecting the structure of fabrics
US2972794A (en) * 1958-05-23 1961-02-28 Cranston Print Works Co Weft straightener
US3257563A (en) * 1962-10-22 1966-06-21 George J Laurent Photosensitive variable aperture scanning device
US3633037A (en) * 1969-10-15 1972-01-04 Perkin Elmer Corp Method and apparatus for observing, detecting and correcting periodic structures in a moving web
FR2442294A1 (fr) * 1978-11-23 1980-06-20 Mahlo Gmbh & Co Kg Dispositif pour apprecier la position des fils de trame d'un le de produit textile en circulation
US4378161A (en) * 1980-08-01 1983-03-29 Sw Industries, Inc. Optical sensing system for determining the angular orientation of weft threads
US4656360A (en) * 1984-10-19 1987-04-07 Sw Industries, Inc. Optical sensing system for determining the orientation of weft threads in a wide variety of fabrics
US6538252B1 (en) * 1999-04-30 2003-03-25 Pleva Gmbh Method and device for determining the alignment of line formations in areal, especially longitudinally moved, webs of a structural formed body
CN102862853A (zh) * 2012-09-25 2013-01-09 吴江市晓昱喷气织造有限公司 纺织用跑偏报警装置
CN114395907A (zh) * 2022-01-12 2022-04-26 绍兴金楚印染有限公司 一种整纬机上的拉伸机构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748367C (de) * 1941-09-23 1944-11-01 C G Haubold Ag Vorrichtung zum Steuern von Gewebebahnen fuer kantengerades Aufwickeln
DE19953130B4 (de) * 1999-04-30 2013-10-31 Pleva Gmbh Verfahren zur Bestimmung der Ausrichtung von Linienformationen in flächigen, insbesondere längsbewegten Bahnen eines Strukturgebildes

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2623262A (en) * 1951-03-22 1952-12-30 Gen Electric Weft straightener
US2737700A (en) * 1952-02-19 1956-03-13 Tubular Textile Machine Corp Stripe matching machine
US2966593A (en) * 1957-04-02 1960-12-27 Leimer Albert Method and apparatus for inspecting the structure of fabrics
US2972794A (en) * 1958-05-23 1961-02-28 Cranston Print Works Co Weft straightener
US2962596A (en) * 1958-10-01 1960-11-29 Leimer Albert Control system for the contactless scanning of textile webs and like sheet material
US3257563A (en) * 1962-10-22 1966-06-21 George J Laurent Photosensitive variable aperture scanning device
US3633037A (en) * 1969-10-15 1972-01-04 Perkin Elmer Corp Method and apparatus for observing, detecting and correcting periodic structures in a moving web
FR2442294A1 (fr) * 1978-11-23 1980-06-20 Mahlo Gmbh & Co Kg Dispositif pour apprecier la position des fils de trame d'un le de produit textile en circulation
US4378161A (en) * 1980-08-01 1983-03-29 Sw Industries, Inc. Optical sensing system for determining the angular orientation of weft threads
US4656360A (en) * 1984-10-19 1987-04-07 Sw Industries, Inc. Optical sensing system for determining the orientation of weft threads in a wide variety of fabrics
US6538252B1 (en) * 1999-04-30 2003-03-25 Pleva Gmbh Method and device for determining the alignment of line formations in areal, especially longitudinally moved, webs of a structural formed body
CN102862853A (zh) * 2012-09-25 2013-01-09 吴江市晓昱喷气织造有限公司 纺织用跑偏报警装置
CN114395907A (zh) * 2022-01-12 2022-04-26 绍兴金楚印染有限公司 一种整纬机上的拉伸机构
CN114395907B (zh) * 2022-01-12 2023-03-14 绍兴金楚印染有限公司 一种整纬机上的拉伸机构

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Publication number Publication date
DE702121C (de) 1941-01-30
GB533924A (en) 1941-02-24

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