US3791418A - Multiple weft mechanism for a weaving machine - Google Patents

Multiple weft mechanism for a weaving machine Download PDF

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Publication number
US3791418A
US3791418A US00155523A US3791418DA US3791418A US 3791418 A US3791418 A US 3791418A US 00155523 A US00155523 A US 00155523A US 3791418D A US3791418D A US 3791418DA US 3791418 A US3791418 A US 3791418A
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brake
yarn
weft
brakes
weft yarn
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US00155523A
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English (en)
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E Pfarrwaller
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Sulzer AG
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Sulzer AG
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    • 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

Definitions

  • This invention relates to a multiple weft mechanism for a weaving machine. More particularly, this invention relates to a weft yarn brake of a weft mechanism for a weaving machine.
  • the yarn brake facility has usually been operated over an operative connection to the weaving machine so as to release an engaged weft yarn at the start of a picking operation.
  • the yarn brake facility has been connected via a cam which is driven by the main shaft of the weaving machine.
  • the cam has released the yarn brake at a particular instant of time during each cycle of operation and has applied the yarn brake at some other instant of time during the cycle. This latter instant of time has also been predetermined and has always been the same.
  • the yarn brake release time has therefore always been of the same length and starts and ends at exactly the same instant of time, i.e., at the same angles of main shaft rotation, during each cycle.
  • the invention provides a weft yarn brake mechanism for a multiple weft weaving machine in which the brake is released and reengaged in a predetermined timed sequence.
  • the time of reengagement of the brake' can be adjusted so as to vary the length of time the brake is disengaged and similarly, engaged.
  • a series of weft yarn brakes are sequentially connected to an adjusting means within the brake mechanism which allows a number of different onset-of-brakin'g times to be obtained for various winds of weft to be picked.
  • the start-of-braking time for the cotton yarns can readily be arranged to occur fairly late during the cycle
  • the start-of-braking time for the elastomeric yarn can be arranged to occur very early in the cycle
  • the start-of-braking time for the synthetics can be arranged to occur towards the middle of the cycle intermediately of the other two kinds of yarn.
  • each weft yarn brake includes an electromagnet for moving a brake member against a brake bed to engage a yarn therebetween while the adjusting means includes an electrical circuit which is selectively connected to the electro-magnet of each brake so as to operate each electromagnet in proper sequence to release and thereafter engage a weft yarn.
  • the circuit includes a variable means such as at least one double cam which is constructed with an adjustable portion such as a segmental gap andv a switch which is activated by the cam so as to open and close the circuit to a respective electromagnet. This cam is rotated off the main shaft of the machine to time the operation of the electromagnet with the machine operation while the gap is arranged to time the length of time the switch is closed.
  • the gap can be adjusted to vary the length of time the switch is closed and thus vary the time a weft yarn is free to pass through the brake.
  • one cam is connected to some of the brakes used to brake the wefts of a multiple weft supply having common braking characteristics while the other cam is connected to the brakes for the remaining wefts of different braking characteristics.
  • the adjusting means can operate independently of the operation of the weaving machine.
  • the advantage of this is that the picked weft is braked, for instance, even if the machine stops between the start of picking and the end of picking for some reason, for instance, a warp breakage, or if the machine must be moved on by hand for inspection or the like just far enough for the next pick to occur.
  • conventional weaving machines there is no weft yarn braking in such cases.
  • the weft yarn has the disadvantage of lying loose in the shed. The weft yarn must therefore either be removed from the shed before operation resumes or it must be tightened and retained manually while the machine is advanced manually until the weft-yam brake becomes operative. Only then can the machine be restarted. If this procedure is not followed, the fabric has unwanted marks or other flaws at the place concerned.
  • FIG. 1 illustrates a diagrammatic view viewed from the. cloth end of a weaving machine incorporating a weft yarn brake mechanism according to the invention
  • FIG. 2 illustrates a schematic diagram of an associated weft-yam brake facility
  • FIG. 3 illustrates a view taken on line 11-11 of FIG. 2;
  • FIG. 4 illustrates a view of a yarn brake according to the invention
  • FIG. 5 illustrates a view of a double cam according to the invention
  • FIG. 6 diagrammatically illustrates a cycle of the weaving machine
  • FIG. 7 illustrates an actuation diagram of a modified embodiment according to the invention
  • FIG. 8 illustrates aplan view of a corresponding detail of a double cam used in the mechanism of FIG. 7;
  • FIG. 9 illustrates a modified yarn brake according to the invention.
  • the weaving machine comprises a frame having two side members 1, 2, a driving motor 3, a driving belt 4 and a main shaft 5.
  • the machine has a number of stationary weft-yam supply bobbins 6 which remain outside the shed during operation and a corresponding numer of weft-yarn brakes 7. Only one of each of the bobbins 6and brakes 7 are shown for simplicity.
  • a picking mechanism 8 is disposed on the one side member 1 while a catcher 9 is disposed on the other side member 2.
  • heald shafts 11 and a reed 12 are disposed between the side members 1 and 2 and a gripper shuttle 14 picks whichever weft yarn 13 is to be picked.
  • the resulting fabric comprises two webs 15 which are wound on to two cloth beams 16.
  • the weaving machine is a 6-weft machine, i.e., six different kinds of weft yarn 13a to 13f (FIG. 2) are picked alternately in accordance with an operations program (weft repeat).
  • an operations program weft repeat
  • weft-yam brakes there are six weft-yam brakes and they have the references 7a to 7f in FIG. 2.
  • each brake 7 comprises an electromagnet 20, a part-spherical brake member 17 which is moved by and forms the armature of the electromagnet 20, a spring 18 which biases the member 17 downwards, as viewed, a brake bed 19' made of a resilient substance, for instance, foam rubber, and two yarn guides 21.
  • the weft yarn 13 moves between the brake member 17 and brake bed 19.
  • the yarn-brake electromagnets 20 are connected by a line 22 to a power supply 23 and are in parallel with one another.
  • the electromagnets are also connected via lines 24a to 24f to respective reed switches 25a to 25f whose other sides extend to contacts 260 to 26f.
  • an adjusting means for actuating the brakes 7 includes a shaft 27 which is coupled with a weft-changing mechanism (not shown) as is known and is operated correspondingly thereby.
  • the adjusting means also includes a reed switch selector device which is mounted on the shaft to activate each switch 25, Le, to actuate the brakes 7a 7s in sequential manner.
  • the device includes a pivot arm 29 which supports a permanent magnet 28 and which is pivoted reciprocatingly by the shaft 27 as indicated by arrow 31 so as to move the magnet 28 past the reed switch 25 corresponding to the particular kind of weft yarn concerned. It is assumed in the position shown in FIGS. 2 and 3 that the magnet 28 was operated immediately before reed switch 25b, and so the same is in the closed state in- FIG. 3. When arm 29 moves magnet 28 past some other reed switch, the switch 25b opens and the other switch closes.
  • the adjusting means also comprises two double earns 32, 33 and 34, 35 which are shown in purely schematic form in FIG. 2 and which are secured to a shaft 36 runshaft 36 by clamping screws 42, 43. Upon slackening of one or both screws 42, 43, the segments 32, 33 can be rotated relative to one another and moved to a new position, thus leaving a variable sector-shaped gap 44.
  • edge 32a of segment 32 first moves past reed switch 37, with the result that magnet 38 then closes switch 37.
  • edge 33a of segment 33 moves past switch 37.
  • the magnetic segment 33 then moves between the switch 37 and magnet 38 so that switch 37 re'opens.
  • the two edges 32b, 33b of the segments 32 and 33 are inoperative.
  • the double cam 34, 35 is of identical construction and operates in the same way as the cam 32, 33 except that the sector-shaped gap 44 of cam 34, 35 is larger or smaller than the gap 44 of the device 32, 33.
  • the reed switch 37 is connected via a line 46 to the power supply 23 and reed switch 39 ,is connected thereto via a line 47.
  • the switches 37, 39 are thus in parallel with one another.
  • the lines 46, 47 continue beyond the switches 37, 39 to terminals 51, 52 having six selectable contacts 51a-51f and 52a-52f, respectively.
  • the contacts 26a-26f can be selectively connected via connecting lines 53 (shown in chain lines) to the contacts 51a-51f and 52a-52f, so that some of the reed switches 25a-25c can be connected, in series with the reed switch 37 to one cam 32, 33 while some of the other switches 25d to 25 f can be connected, in series with reed switch 39 as shown.
  • the weft-changing mechanism moves into the picking line of whichever weft yarn or yarn take-up device is required in accordance with the weft pattern repeat. Preparations are then made for yarn transfer to shuttle 14 as is known. Also, the weft-changing mechanism moves magnet 28 of the selector mechanism shown in FIGS. 2 and 3 past the reed switch, e.g., the reed switch 25b, corresponding to the particular weft yarn concerned. Reed switch 25b, therefore, closes, thus preparing weft-yam brake 7b for release.
  • Edge 32a of segment 32 then moves past reed switch 37 so that the switch 37 closes.
  • the control or actuating circuit formed by the components 32, 7b, 24b, 25b, 46 and 37 closes so that reed switch 25b is energized.
  • Brake 7b then releases.
  • the .brake member 17 then moves as indicated by line A in FIG. 6, from its on position B through its central position C, in which the brake member 17 and bed 19 merely contact one another lightly, into the off position D.
  • Shuttle 14 simultaneously engages the weft yarn. Picking then be ginsbetween the positions C and D, for instance, at of main-shaft rotation, the shuttle being shot at position E.
  • the cam 32, 33 continues to rotate, and shortly before the end of picking, the edge 33a passes by the reed switch 37.
  • Shuttle 14 enters the catcher 9 at about the same time.
  • the passing of the segment 33 between the switch 37 and magnet 38 opens the reed switch 37, so that the control circuit is de-energized.
  • the spring 18 moves brake member 17 from position G to position II.
  • the actual start-of-braking time is at the central position M at which the brake member 17, yarn 13b and bed 19 just touch for the first time.
  • the weft-yarn brake 7b is fully on at about 250.
  • the shuttle 14 stops completely at position J, i.e., at about 310.
  • the segment 32 is first adjusted to place the edge 32a in some appropriate angular position shortly before the start of picking; this position is foundby experience. Segment 33 is then adjusted to leave open the segmental gap 44 which corresponds to the picking time.
  • the minimum gap size corresponds to the earliest brake application time N for the weft yarn, represented by line K, whereas if the gap 44 is fairly large, the start P of the brake .application time is very late, being represented by line L.
  • the braking range between the lines K and L is 80.
  • the Y delay time for brakes 7a to 7c can be, e.g., 100 milliseconds, corresponding to the section between the lines C and M in FIG. 6, and the delay interval for the brakes 7d to 7f can be, e.g., 130 milliseconds and corresponds to the section between the lines C and P.
  • cams 32, 33 and 34, and associated reed switches and permanent magnets are provided, more kinds of weft yarn can be braked for instance, each of the 6 kinds of weft yarn can be braked at a particular time.
  • the adjusting means can alternatively include a power supply 23 which supplies power to an electronic control means 54 to which connecting wires 24a to 24f for connecting the yarn brakes 7a to 7f to the reed switches 25a to 25f are connected.
  • the selector device is the same as in FIG. 2 and is indicated only by the moving permanent magnet 28. For the rest, only a single two-segment cam 32, 33 is provided. The gap 44 is much smaller than is the case in FIG. 5.
  • the control means 54 is constructed, as shown, with the lines 22 and 46 connected thereto and with a delay facility (not shown) therein.
  • the delay facility connects with the lines 24a-24f and the power supply 23 in any suitable manner so as to effect a delay in the time the brakes 7a-7 f remain energized, i.e., open.
  • the time delay for each brake 7 can be suitably adjusted independently of the others or can be adjusted in common with a number of the others.
  • the delay facility for each brake 7 and line 24 is actuated upon closing of the respective switch 25 in the line.
  • de-energization of the brakes 7 does not depend on the time at which the edge 33a of the cam 32, 33 passes by the switch 37 causing closing of the switch In operation, shortly before the shuttle 14 is shot from the mechanism 8, the edge 32a of segment 32 passes by reed switch 37.
  • the switch 37 therefore closes and, since magnet 28 is in front of reed switch 25a, brake 7a releases. Shortly thereafter, the shuttle 14 is picked into the shed. Edge 330 moves past reed switch 37 immediately after picking, so that switch 37 opens and a delay facility for the respective brake 7a and forming part of the electronic control means 54 starts.
  • brake 7a is deenergized after a short time, as a rule, at a time, for instance, about the position C (FIG. 6) when the shuttle is a short distance away from the catcher 9, and can therefore be reapplied by spring 18.
  • the weft-changing mechanism moves the magnet 28 past another reed switch, 'for instance, switch 25d, so that the switch 25d closes, thus preparing for the release of the associated yarn brake 7d.
  • the brake 7d therefore opens when the edges 32a, 33a pass by, and the delay facility for brake 7d in the control menas 54 reapplies the brakes shortly afterwards, and so on.
  • the control means 54 can be so devised that the same delay time can be set for all or some of the yarn brakes 7a to 7f, so that the yarn brakes concerned all close at the same time after the edge 33a has passed by the switch 37.
  • the control means 54 can be such that the brake application delaytime for each brake can be adjusted separately to a special value somewhere between the position K and L to suit the particular kind of yarn concerned.
  • the delay in brake application after the edge 33a passes by the switch 37 can be, e.g., 130 milliseconds for brakes 7a and 7b, milliseconds for brake 7c and milliseconds for brakes 7d to 7f.
  • the cam 32,33 does not determine the delay interval but instead determines only the start of the delay interval whereas the end of the delay interval is determined by the control means 54.
  • This embodiment therefore operates independently of the running of the weaving machine, i.e., the yarn brakes 7a-to 7f are applied at the predetermined time even though the machine should be stopped for any reason, such as a warp yarn breaking, immediately after the picking of the shuttle 14.
  • the yarn brakes 7a to 7 f would not be reapplied since the cams 32, 33 and 34, 35 stop when the machine does, with the result that the braking signal which the edge 33a is adapted to trigger cannot be produced.
  • each yarn brake 7 comprises a cylinder 55 and, reciprocable therein, a piston 56 mounted on a piston rod 57 bearing a braking member 17.
  • Cylinder 55 has a check valve 58 for the intake of air and is formed with a constricted orifice 61 which is adjustable by a screw 59 for expelling air as the piston 56 moves downwardly, as viewed, under the force of the spring 18.
  • the piston rod 57 terminates at the top in a bent part 57b and cooperates with a lever arm 62 which is mounted for pivoting on a pivot 63 and which continues as a second arm 64.
  • a spring 65 is connected to the lever 62, 64 to pivot the lever 62, 64 anticlockwise.
  • a pull cable 66 is secured to the end of arm 64 and runs over a deflecting roller 67 to an arm 68 of a double-armed rocking lever 68, 71 mounted at a pivot 69.
  • the arm 71 When in the position shown, the arm 71 is in engagement with an abutment 72.
  • the arm 71 carries a roller 73 which cooperates with a cam 74 having a camming surface 75.
  • a similar linkage is associated with each yarn brake 7; however, only a single cam 74 which can move in a direction perpendicular to the plane of the drawing is used for all the linkages. This cam 74 therefore cooperates with any one arm or lever 71 at a time.
  • the delay between engagement of camming surface 75 with roller 73 and the engagement of brake member 17 with bed 19 can be adapted to suit requirements by adjustment of the screw 59, the time at which braking starts varying with the size of the flow cross-section of the orifice 61.
  • a difierent delay can be selected for each of the six brakes 7a to 7]", i.e., braking can start at different times for each of the brakes.
  • the start-of-braking time at the end of picking is, with the facility shown in FIG. 9, independent of the running of the weaving machine, i.e., if the same stops for any reason, e.g., immediately after the shooting of the shuttle, so that the cam 74 ceases to rotate, the various brakes 7a to 7f are still reapplied at the predetermined time.
  • FIG. 9 is also suitable for hydraulic operation.
  • a weft yarn brake mechanism for a multiple weft weaving machine comprising a series of weft yarn brakes, each brake having an off position for releasing a weft yarn therefrom and an on position for engaging a weft yarn therein during a picking operation;
  • an adjusting means including a selector device selectively connected to each brake for releasing said brakes in sequential manner into a respective off position and means connected to each brake for adjusting the onset of said on position of each brake relative to the other brakes to initiate braking of a respective yarn during a picking operation at a time different from the other yarns.
  • a multiple weft weaving machine having a main shaft
  • a plurality of weft supply bobbins for supplying weft yarns to said machine for picking operations therein;
  • each yarn brake being positioned between said machine and a respective one of said bobbins to engage a weft yarn therein at an on position thereof and to release a weft yarn therefrom at an off position thereof;
  • an adjusting means connected to said yarn brakes for moving each said yarn brake between said positions, said adjusting means being connected to said shaft to move a respective yarn brake into said off position at the start of a picking operation and having a variable means therein for adjusting the onset of the movement of said yarn brake into said on position at the end of the picking operation.
  • said adjusting means includes an electrical circuit selectively connected to each brake; and said variable means includes a pair of switches connected in parallel in said circuit, one of said switches being connected to one of said brakes and the other of said switches being connected to another of said brakes, and a pair of disc cams, each of said disc cams being constructed to selectively open and close a respective one of said switches and including an adjustable portion for adjusting the onset of closing of a respective switch to initiate movement of a respective yarn brake into said on position.
  • each disc cam includes a pair of rotatable segmental discs disposed to define an adjustable segmental gap therebetween defining said adjustable portion and wherein each said switch includes a reed switch and a permanent magnet disposed on opposite sides of a respective disc cam whereby rotation of said disc cam between said reed switch and magnet allows said gap to expose said magnet to said reed switch to close said reed switch and complete the electrical circuit through a respective yarn brake to move said yarn brake to said off position.
  • variable means is operated independently of said machine to initiate movement of a respective yarn brake into said on position.
  • variable means includes an electronic control means having a delay facility therein for delaying the onset of the movement of a respective yarn brake into said on position thereof.
  • variable means includes a piston connected to a respective brake to move said brake between said off position and said on position, a cylinder slidably mounting said piston therein, means for supplying a pressure medium into said piston during movement of said brake to said off position, and means for adjustably throttling the flow of pressure medium from said cylinder during movement of said brake to said on position.
  • said adjusting means further includes a weft selector device for selecting a respective weft from one of said supply bobbins for a picking operation on said machine, and wherein said brakes are connected in parallel to said adjusting means and said selector device is selectively connected in series with a respective brake.
  • a multiple weft weaving machine having means for forming a shed, a plurality of weft yarn supply bobbins outside said shed; a weft yarn brake mechanism including a plurality of yarn brakes, each brake corresponding to a respective weft yarn supply bobbin, and means for actuating a selective one of said brakes to release said one brake from a weft yarn at the start of a I weft picking operation; and an adjusting means for adjusting the on-set of braking reengagement of said one brake on the weft yarn at the end of the weft picking operation to vary the length of time said one brake is released.
  • a method of braking weft yarns in a multiple weft weaving machine comprising the steps of positioning each of a plurality of weft yarns from a plurality of weft yarn supply bobbins within a respective weft yarn brake of a plurality of brakes, each brake having an off-position for relasing a weft yarn and an on-position for engaging a weft yarn during a picking operation; selectively releasing each of the brakes into a respective off-position in a sequential manner to release a respective yarn; and adjusting the onset of the on-position of each brake relative to the other brakes to initiate braking of a respective yarn during a picking operation at a time different from the other yarns.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US00155523A 1970-06-30 1971-06-22 Multiple weft mechanism for a weaving machine Expired - Lifetime US3791418A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH986370A CH525306A (de) 1970-06-30 1970-06-30 Webmaschine, insbesondere Mehrschuss-Webmaschine

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US3791418A true US3791418A (en) 1974-02-12

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US00155523A Expired - Lifetime US3791418A (en) 1970-06-30 1971-06-22 Multiple weft mechanism for a weaving machine

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US (1) US3791418A (de)
JP (1) JPS5122539B1 (de)
AT (1) AT311907B (de)
CH (1) CH525306A (de)
CS (1) CS166773B2 (de)
FR (1) FR2096598B1 (de)
GB (1) GB1357213A (de)
SU (1) SU406368A3 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4256149A (en) * 1979-04-09 1981-03-17 M. Lowenstein & Sons, Inc. Electromechanical filling indicator for pattern-controlled weaving loom
US4326566A (en) * 1979-09-11 1982-04-27 N. V. Weefautomaten Picanol Color selector
US4450874A (en) * 1981-01-07 1984-05-29 Leesona Corporation Yarn clamp
US6575200B2 (en) * 1998-05-05 2003-06-10 Robosoft N.V. Weaving machine and method for manufacturing fabrics with pattern-forming weft threads such as Kelim or Gobelin fabrics
CN109208158A (zh) * 2017-06-30 2019-01-15 意达股份公司 在片梭织机中不使用假边的纬纱操作装置
US10893931B2 (en) * 2017-10-16 2021-01-19 Amrita Vishwa Vidyapeetham Strong, flexible, and thrombus-free woven nanotextile based vascular grafts, and method of production thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429394A (en) * 1945-09-14 1947-10-21 Mohawk Carpet Mills Inc Needle motion
US3315708A (en) * 1965-01-21 1967-04-25 Scheffel Walter Thread changing apparatus for a shuttleless loom
US3554239A (en) * 1967-06-30 1971-01-12 Fatex Shuttleless loom weft control device
US3563281A (en) * 1968-03-08 1971-02-16 Sulzer Ag Apparatus and method for operating a weaving machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4221008Y1 (de) * 1965-03-10 1967-12-05
FR1489111A (fr) * 1966-05-31 1967-07-21 Rueti Sa Atel Const Métier à tisser

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429394A (en) * 1945-09-14 1947-10-21 Mohawk Carpet Mills Inc Needle motion
US3315708A (en) * 1965-01-21 1967-04-25 Scheffel Walter Thread changing apparatus for a shuttleless loom
US3554239A (en) * 1967-06-30 1971-01-12 Fatex Shuttleless loom weft control device
US3563281A (en) * 1968-03-08 1971-02-16 Sulzer Ag Apparatus and method for operating a weaving machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4256149A (en) * 1979-04-09 1981-03-17 M. Lowenstein & Sons, Inc. Electromechanical filling indicator for pattern-controlled weaving loom
US4326566A (en) * 1979-09-11 1982-04-27 N. V. Weefautomaten Picanol Color selector
US4450874A (en) * 1981-01-07 1984-05-29 Leesona Corporation Yarn clamp
US6575200B2 (en) * 1998-05-05 2003-06-10 Robosoft N.V. Weaving machine and method for manufacturing fabrics with pattern-forming weft threads such as Kelim or Gobelin fabrics
CN109208158A (zh) * 2017-06-30 2019-01-15 意达股份公司 在片梭织机中不使用假边的纬纱操作装置
CN109208158B (zh) * 2017-06-30 2021-09-24 意达股份公司 在片梭织机中不使用假边的纬纱操作装置
US10893931B2 (en) * 2017-10-16 2021-01-19 Amrita Vishwa Vidyapeetham Strong, flexible, and thrombus-free woven nanotextile based vascular grafts, and method of production thereof

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Publication number Publication date
FR2096598A1 (de) 1972-02-18
CH525306A (de) 1972-07-15
JPS5122539B1 (de) 1976-07-10
DE2034788B2 (de) 1972-12-21
GB1357213A (en) 1974-06-19
CS166773B2 (de) 1976-03-29
FR2096598B1 (de) 1976-02-06
AT311907B (de) 1973-12-10
DE2034788A1 (de) 1972-01-20
SU406368A3 (de) 1973-11-05

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