US3895657A - Device for controlling gripper shuttle in looms - Google Patents

Device for controlling gripper shuttle in looms Download PDF

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Publication number
US3895657A
US3895657A US461412A US46141274A US3895657A US 3895657 A US3895657 A US 3895657A US 461412 A US461412 A US 461412A US 46141274 A US46141274 A US 46141274A US 3895657 A US3895657 A US 3895657A
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United States
Prior art keywords
shuttle
gripper
shuttle box
guideway
arm
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Expired - Lifetime
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US461412A
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English (en)
Inventor
Jan Bilek
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.)
Elitex Zavody Textilniho
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Elitex Zavody Textilniho
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Application filed by Elitex Zavody Textilniho filed Critical Elitex Zavody Textilniho
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Publication of US3895657A publication Critical patent/US3895657A/en
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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
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/52—Shuttle boxes
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/34—Weft stop motions

Definitions

  • ABSTRACT A device for controlling gripper shuttles in weaving looms, particularly looms using rotary shuttle boxes at both sides thereof, by which the gripper shuttles can be reliably braked upon arrival therein and be prevented from undesirable recoil into the shed. Furthermore, their correct position in the shuttle box can be ascertained at the given moment so that they can be displaced into a position suitable for feeding a new weft thread.
  • Two adjusting stops are arranged on the holder transversal to the guideway of the gripper shuttle in each shuttle box at a distance from the guideway making it possible for the gripper shuttle to pass by them.
  • the stops are of equal length in a direction transverse to the guideway and cooperate with one arm of a swingable two-arm friction damper, which is provided with a surface for adjusting and receiving an arrived gripper shuttle; the other arm of said friction damper forms a stop motion feeler upon an incorrect arrival of the gripper shuttle.
  • the friction damper is fastened at a free end of a control level which is swingable in both a perpendicular and longitudinal plane relative to the guideway of a gripper shuttle inside a shuttle box.
  • the present invention relates to a device for controlling gripper shuttles in weaving looms, particularly looms using rotary shuttle boxes at both sides thereof, by which the gripper shuttles can be reliably braked upon arrival therein and be prevented from undesirable recoil into the shed. Furthermore, their correct position in the shuttle box can be ascertained at the given moment so that they can be displaced into a position suitable for feeding a new weft thread.
  • two adjusting stops are arranged on a holder transversely to the guideway of the gripper shuttle in each shuttle box at a distance from the guideway making it possible for the gripper shuttle to pass by them.
  • the stops are of unequal length in a direction transverse to the guideway and cooperate with one arm of a swingable two-arm friction damper, which is provided with a surface for receiving and ajusting an arrived gripper shuttle.
  • the other arm of said frictional damper forms a stop motion feeler upon an incorrect arrival of the gripper shuttle; the frictional damper is fastened at a free end of a control lever which is swingable in both a perpendicular and longitudinal plane relative to the guideway of a gripper shuttle inside a shuttle box.
  • FIG. 1 is a view in elevation of a loom with devices according to the present invention on both sides thereof;
  • FIG. 2 is a detailed view on an enlarged scale of the right side of the loom showing the arrangement of the driving mechanism of the control lever of the frictional damper;
  • FIG. 3 is a detailed view on a still larger scale showing the position of the frictional damper at the right side of the weaving loom as shown in FIG. 2 with the damper prepared to damp the impact of the gripper shuttle arriving from the left, the control lever of the frictional damper being swung out to the extreme right hand position;
  • FIG. 4 is a detailed view similar to FIG. 3 showing the position of the frictional damper after it has been touched at its upper arm by the edge of the gripper shuttle, the control lever of said frictional damper being still swung out to the right;
  • FIG. 5 is a detailed view similar to FIG. 3 and 4 showing the position of the frictional damper after it has been displaced to the left by control lever, the frictional damper being supported with its upper arm against the longer adjusting stop on the holder and having displaced the gripper shuttle back into the given threading position by pressure on its front edge;
  • FIG. 6 is a plan view of the arrangement of the frictional damper e.g. as shown in FIG. 5, the view showing both adjustment stops of unequal length for the upper arm of the frictional damper and also showing the edge of the gripper shuttle and the space in which said upper arm of the frictional damper can be swung out, on the one hand, in a vertical direction from the guideway of the gripper shuttle in the shuttle box, and, on the other hand, also in the longitudinal direction relative to said guideway.
  • the following description of the device for controlling the gripper shuttle is mainly directed to the right hand side of the loom, since the devices employed on both sides of the loom are identical.
  • Tube 3 is the main beam of the slay 5, which is fastened to tube 3 by means of slay arms 6; the tube carries reed 7 and guiding comb 8, which define the path for passing the gripper shuttle 14 from one side of the loom to the other.
  • Both ends of tube 3 end in housings 9, in which there are mounted the mechanisms of the control levers 10 of frictional dampers 11.
  • Stop motion mechanisms 12 are also arranged on housings 9, as well as rotary shuttle boxes 13 for the shuttle gripper l4, and an ejecting mechanism 15 for the gripper shuttle 14, including the trigger mechanism 16 for the ejecting mechanism.
  • a motor 17 drives the loom through a transmission 18 which includes electromagnetic clutch-brake mechanism 19 connected to shaft 2.
  • the mechanism 19 operates as a clutch.
  • the mechanism 19 operates as a brake which stops the loom.
  • the control lever 10 is swingably mounted for lateral movement on a pin 24 which is mounted stationarily on a swingable transverse carrier 25 mounted by means of pins 26 in the sides of housing 9.
  • the transverse carrier 25 is provided with an arm 27 and a roller 28 which follows the surface of a face cam 29 which is connected to disc 21.
  • the arm 27 of the transverse carrier 25 is pressed towards the surface of cam 29 by a coil tension spring 30.
  • cam 22 on disc 21 imparts to the upper end of the control lever 10 of frictional damper 11 a motion parallel the guideway 31 of the gripper shuttle 14 in shuttle box 13 and cam 29 imparts to said control lever 10 via transverse carrier 25 and its arm 27 a motion in a plane perpendicular to said guideway 31 of gripper shuttle 14 in shuttlebox 13.
  • Such motion of control lever 10 are synchronized since cams 22 and 29 are connected.
  • the shuttle box oscillates through [80".
  • said shuttle box is provided at its rear end e.g. by a toothed pinion (not shown) which is in engagement by e.g. a rack (not shown) performing a reciprocating motion derived from one of the main members of the loom, e.g. from shaft 2.
  • a braking jaw passes through the center of shuttle box 13 and opens at the bottom of said guideway 31 ofgripper shuttle 14. The said brakingjaw presses the arrived gripper shuttle 14 against the inclined walls of the dovetail guideway 31 thus performing an efficient braking of the shuttle.
  • the operation of said braking jaw again suitably synchronized with the other mechanism of the loom, including. the motions of the gripper shuttle 14 in the loom.
  • the cylinder of a shuttle ejecting device is fastened to the upper part of the housing 9. Inside the cylinder of said ejecting device 15 there is mounted a piston having a piston rod 32, which acts with its free end against the rear of edge 33 of the gripper shuttle 14. The piston in cylinder of the ejecting device 15 is acted upon by a pressure fluid; the moment at which the gripper shuttle 14 is to be ejected with an abrupt forward movement back into the shed is determined by a trigger mechanism 16 having a spring loaded tie rod 34 positioned to be acted upon by the upper free end of control lever 10.
  • Mechanism 12 substantially consists of a contactless relay of known construction employing the principle that into an induced magnetic flow in the body of said relay there is introduced an armature e.g. a metal flag 35 carried by tie rod 36, which causes a change in oscillation of said electromagnetic flux.
  • an armature e.g. a metal flag 35 carried by tie rod 36, which causes a change in oscillation of said electromagnetic flux.
  • Such change of flux influences e.g. a scanner (not shown) connected into the circuit of the electromagnetic clutch-brake mechanism 19.
  • a holder 37 On the cylinder of ejecting mechanism 15 there is fastened a holder 37 with at least two adjusting stops 38 and 39 of unequal length. Such stops being arranged transversely to the guideway 31 at a distance which makes it possible for the gripper shuttle 14 to pass through said guideway 31.
  • the two adjusting stops 38 and '39 are independently adjustable along the length of holder 37 and inside its recess 40 by means of adjusting means 41 and 42.
  • the two adjusting stops 38 and 39 cooperate with the upper arm of the frictional damper 11 in a manner explained below.
  • Frictional damper 11 is made in the form of an angular two-arm or bellcrank lever and is fastened at the upper free end of control lever 10 approximately at the center of damper 11 by means of an adjusting screw 43 and a friction washer 44.
  • the frictional damper 11 is advantageously made of very light plastic material of anti-abrasive character.
  • control lever 10 Upon normal operation of the loom, before the arrival of a gripper shuttle 14 into shuttle box 13 at the right side of the loom, the upper free end of control lever 10 is swung out into its extreme right position and is simultaneously placed as near as possible to the guideway 31 of the gripper shuttle l4 inside shuttle box 13 (FIG. 3). This position of control lever 10 is produced by the action of cam 22 of disc 21 and by cam 29 at the bottom of housing 9.
  • frictional damper 11 is swung out in such manner that its upper free arm is directed in a direction inclined toward the direction of arrival of the gripper shuttle 14, and is not at this time within the path of the adjusting stop 39, this latter condition is produced later by merely swinging the upper free end of control lever 10 towards guideway 31 inside shuttle box 13.
  • the gripper shuttle 14 is immediately braked upon its arrival in guideway 31 of shuttle box 13 by a jaw (not shown) opening at the bottom of said guideway 31.
  • the remaining kinetic energy of the shuttle is damped by impact against the front of its edge 33 against the upper free arm of frictional damper 1 1, which is turned upon said impact into a position as shown in FIG. 4.
  • An overturnig of the frictional damper 11 is prevented by a suitable construction of the upper end of the control lever 10, which for this purpose has suitable impact surfaces at its end, for the upper free arm of frictional damper 11, etc.
  • the positionof control lever 10 has not been changed, and only frictional damper 11 has turned, as has already been mentioned above.
  • control lever 10 In the following phase of controlling the gripper shuttle 14, the upper free end of control lever 10 begins to move to the left, and entrains therewith frictional damper 11 which, by pressing against the front of edge 33 of gripper shuttle 14 moves the shuttle into a position which is most suitable for introducing a new weft thread into the thread gripping mechanism at its end.
  • the advancement of gripper shuttle 14 is given by the stroke of control lever 10 in that direction and is performed until one end of the upper free arm of frictional damper 11 touches the adjusting stop 38. Simultaneously, the neighboring edge of the same upper free arm of frictional damper 11 stops further advancing of gripper shuttle 14 into said required position.
  • the said motion of the upper free end of control lever 10 is produced by cam 22 of disc 21 at the bottom of housing 9.
  • control lever 10 Because this motion of control lever 10 is a positive one, it is checked at that phase, whether gripper shuttle 14 has arrived at all in shuttle box 13, and whether it has arrived slowly, or was not stopped e.g. at the beginning of guideway 31 inside shuttle box 13. Upon the correct arrival of gripper shuttle 14 into shuttle box 13, as described above, frictional damper 11 is turned. In
  • control lever is swung by cam 29, together with the frictional damper 11, from the guideway 31 in the shuttle box 13 and thus also from the adjusted gripper shuttle 14.
  • the shuttle begins to turn through an angle of 180 with the newly introduced weft thread in its gripping mechanism.
  • control lever 10 After that swinging, the control lever 10 begins immediately to move forward, i.e. to the right from its basic position.
  • the upper free arm of frictional damper 11 is situated between the two adjusting stops 38 and 39.
  • the upper free arm of frictional damper 11 contact the shorter adjusting stop 39, whereupon the whole frictional damper 11 is turned into the position shown in FIG. 3.
  • control lever 10 engages the spring loaded tie rod 34 of trigger mechanism 16 of ejecting device the piston rod 32 then ejects gripper shuttle 14 into the shed, said gripper shuttle having meanwhile been turned through an angle of 180.
  • control lever 10 is displaced towards the guideway 31 of gripper shuttle 14 in shuttle box 13 and together with frictional damper 11 resumes its initial position, which was described at the beginning of the specification, ready for the next reception of the shuttle.
  • the said upper arm of frictional damper 11 damps the impact of the front of edge 33 of gripper shuttle 14 at the time at which it is at an inclined position with respect to the direction of arrival of gripper shuttle 14.
  • the point of impact A (FIG. 3) is thus shifted higher towards the end of the upper free arm of frictional damper 11.
  • gripper shuttle 14 is moved back into its required position, this is effected by the direct action of the same arm of frictional damper 11 but at another contact point B or surface of that arm of the frictional damper 11, respectively.
  • said frictional damper is turned, as shown in FIG.
  • the operation of the device according to the present invention is repeated in cycles on both sides of the weaving loom.
  • the device according to the present invention is simple in construction and thus reduces the movable mass to a minimum extent thereby permitting the speed of operation of the loom to be increased.
  • a device for controlling gripper shuttles in a loom having a rotary shuttle box at one side of the loom, the shuttle box having a shuttle-receiving guideway disposed parallel to the warp shed comprising a control lever cooperating with the shuttle box, means mounting the control lever for swinging in both the perpendicular and longitudinal plane relative to the guideway of the shuttle box, two adjustable stops of unequal length extending parallel to the axis of rotation of the shuttle box and spaced in a direction transverse to said axis of rotation of the shuttle box, the stops being located at such distances from the shuttle box as to permit the shuttle when in the shuttle box to pass by them, a two-arm frictional damper permanently mounted upon the free end of the control lever, one arm of the damper bing provided with a surface for receiving and adjusting the position longitudinally of the shuttle receiving guideway a gripper shuttle which has arrived in shuttle box, a mechanism for stopping the loom upon the incorrect arrival of a shuttle in the shuttle box, the other arm of the damper forming a
  • a device as claimed in claim 1, comprising a holder upon which the adjustable stops are mounted, and means mounting the holder upon the shuttle box for adjusting in a direction transverse to the axis of rotation of the shuttle box.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US461412A 1973-04-18 1974-04-16 Device for controlling gripper shuttle in looms Expired - Lifetime US3895657A (en)

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CS2774*BA CS165124B1 (nl) 1973-04-18 1973-04-18

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993104A (en) * 1974-09-25 1976-11-23 Lebocey Industries Shuttle positioner and nipper opening device for loom
FR2368563A1 (fr) * 1976-10-20 1978-05-19 Crompton & Knowles Corp Mecanisme de commande pour navettes a pince
FR2393094A1 (fr) * 1977-06-01 1978-12-29 Sulzer Ag Dispositif recepteur de l'organe d'insertion de la trame d'une machine a tisser
US4294291A (en) * 1980-05-15 1981-10-13 Crompton & Knowles Corporation Shuttle retaining apparatus
US6301519B1 (en) * 1997-03-27 2001-10-09 Dornier Gesellschaft Mbh Method and apparatus for controlling and monitoring the cutting function of a thread cutter driven by an electric motor in looms
US6308625B1 (en) * 2000-02-18 2001-10-30 Heidelberger Druckmaschinen Ag Hopper gripper drum

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5913101A (ja) * 1982-07-14 1984-01-23 Toshiba Corp 制御棒駆動水圧制御ユニツト用アキユムレ−タ
JPS5925437U (ja) * 1982-08-09 1984-02-17 三洋電機株式会社 温度表示回路
JPS6415502A (en) * 1987-07-10 1989-01-19 Toshiba Machine Co Ltd Piston accumulator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332452A (en) * 1965-07-02 1967-07-25 Webstuhlbau Grossenhain Veb Shuttle feeler for looms
US3487860A (en) * 1967-01-26 1970-01-06 Elitex Zavody Textilniho Shuttle braking arrangement
US3563281A (en) * 1968-03-08 1971-02-16 Sulzer Ag Apparatus and method for operating a weaving machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332452A (en) * 1965-07-02 1967-07-25 Webstuhlbau Grossenhain Veb Shuttle feeler for looms
US3487860A (en) * 1967-01-26 1970-01-06 Elitex Zavody Textilniho Shuttle braking arrangement
US3563281A (en) * 1968-03-08 1971-02-16 Sulzer Ag Apparatus and method for operating a weaving machine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993104A (en) * 1974-09-25 1976-11-23 Lebocey Industries Shuttle positioner and nipper opening device for loom
FR2368563A1 (fr) * 1976-10-20 1978-05-19 Crompton & Knowles Corp Mecanisme de commande pour navettes a pince
FR2393094A1 (fr) * 1977-06-01 1978-12-29 Sulzer Ag Dispositif recepteur de l'organe d'insertion de la trame d'une machine a tisser
US4192354A (en) * 1977-06-01 1980-03-11 Sulzer Brothers Limited Shuttle sensing means for weaving machine catcher mechanism
US4294291A (en) * 1980-05-15 1981-10-13 Crompton & Knowles Corporation Shuttle retaining apparatus
EP0040479A1 (en) * 1980-05-15 1981-11-25 CROMPTON & KNOWLES CORPORATION Shuttle retaining apparatus
US6301519B1 (en) * 1997-03-27 2001-10-09 Dornier Gesellschaft Mbh Method and apparatus for controlling and monitoring the cutting function of a thread cutter driven by an electric motor in looms
US6308625B1 (en) * 2000-02-18 2001-10-30 Heidelberger Druckmaschinen Ag Hopper gripper drum
US6701840B2 (en) * 2000-02-18 2004-03-09 Heidelberger Druckmaschinen Ag Hopper gripper drum

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Publication number Publication date
JPS578902B2 (nl) 1982-02-18
JPS5018764A (nl) 1975-02-27
CS165124B1 (nl) 1975-11-28

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