US3875974A - Device for controlling gripper shuttles in looms - Google Patents

Device for controlling gripper shuttles in looms Download PDF

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Publication number
US3875974A
US3875974A US460421A US46042174A US3875974A US 3875974 A US3875974 A US 3875974A US 460421 A US460421 A US 460421A US 46042174 A US46042174 A US 46042174A US 3875974 A US3875974 A US 3875974A
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United States
Prior art keywords
shuttle
box
braking
gripper
radial
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Expired - Lifetime
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US460421A
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English (en)
Inventor
Zdenek Rambousek
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Elitex Zavody Textilniho
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Elitex Zavody Textilniho
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    • 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
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/24—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick by gripper or dummy shuttle
    • 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
    • D03D49/58—Shuttle guards

Definitions

  • ABSTRACT The present invention relates to a device for controlling gripper shuttles looms, particularly those provided with rotary shuttle boxes at both sides thereof. By said device, the gripper shuttle can be efficiently braked upon its arrival at the shuttle box and can be prevented from undesirable recoil into the shed.
  • the device brakes the arriving gripper shuttle along a relatively longer path, but returns the shuttle immediately afterwards in a controllable manner at least partially into the shed, and gradually adjusts the shuttle in the immediate proximity of the selvedge, by cooperation of a weft thread tensioning device on the other side of the loom, so that the weft thread and unthreaded from the gripper shuttle does not excessively project over the fabric selvedge.
  • a braking box is arranged parallel to the guideway of the gripper shuttle in each shuttle box, said braking box being movable in both the radial and longitudinal directions relative to the said guideway of the gripper shuttle, and comprising a braking jaw mounted in an elastic medium and a swingable pawl with a free end located beside the end of said braking box, and a picker with an elastic member mounted beside said braking box and further in the direction of arrival of the gripper shuttle.
  • Said picker is movable in both the radial and longitudinal directions relative to the guideway of the gripper shuttle in the shuttle box, and a stop motion feeler mounted within the range of action of the said free end of the swingable pawl.
  • the present invention relates to a device for controlling gripper shuttles in looms. particularly those pro vided with rotary shuttle boxes at both sides thereof.
  • the gripper shuttle can be efficiently braked upon its arrival at the shuttle box and can be prevented from undesirable recoil into the shed. Further, said device can check the correctness of the position of the gripper shuttle and transfer it temporarily, before its adjustment to a position suitable for inserting a new weft thread. partially back into the shed. where said gripper shuttle remains until the moment at which the warp threads begin to interlace the inserted weft thread.
  • a braking box is arranged parallel to the guideway of the gripper shuttle in each shuttle box, said braking box being movable in both the radial and longitudinal directions relative to the said guideway of the gripper shuttle, and comprising a braking jaw mounted in an elastic medium and a swingable pawl with a free end located beside the end of said braking box. and a picker with an elastic member mounted beside said braking box and further in the direction of arrival of the gripper shuttle. Said picker is movable in both the radial and longitudinal directions relative to the guideway of the gripper shuttle in the shuttle box, and a stop motion feeler mounted within the range of action of the said free end of the swingable pawl.
  • FIG. 1 is a diagrammatic view in elevation of the driving mechanism and the slay of the loom, illustrative embodiment of the device according to the present invention being shown mounted on the loom;
  • FIG. 2 is a view on an enlarged scale partially in elevation and partially in section of the device at the right side of the loom, the view showing the arrangement of the braking box and the picker at the ends of two arm levers mounted swingably on a transversal carrier and controlled by cams on the control drum;
  • FIG. 3 is a view in longitudinal section through the braking box and the picker in their basic position when observed from above before the arrival of the gripper shuttle, the stop motion feeler and its electric circuit being shown diagrammatically;
  • FIG. 4 is a view similar to FIG. 3, but showing a partial penetration of the gripper shuttle into the shuttle box and its braking by the braking jaw in the braking box;
  • FIG. 5 is a view similar to FIG. 3, but showing the gripper shuttle completely stopped after its arrival and braking by the braking jaw by the impact of its front side against the buffer of the picker;
  • FIG. 6 is a view similar to FIG. 3, but with the gripper shuttle being shown after being pressed by the picker into the shed and with the whole gripper box; the correct position of the braking box pawl being controlled by the stop motion feeler;
  • FIG. 7 is a view of the device as shown inf FIG. 3, upon the returning of the gripper shuttle by the action of the pawl in the braking box simultaneously with movement of said braking box and picker into a position suitable for feeding a new weft thread into the gripping mechanism of the gripper shuttle;
  • FIG. 9 is a view in cross-section through the braking box, the gripper shuttle and the shuttle box, the section being taken along line A--A in FIG. 3;
  • FIG. 10 is a view in longitudinal section through the picker and the braking box, the section being taken along line 8-8 in FIG. 3.
  • a slay 5 is fastened on slay arms 4 and carries a reed 6 and a guiding comb 7.
  • Reed 6 and guiding comb 7 define a path for the transfer of a gripper shuttle 14 from one side of the loom to the other.
  • the gripper shuttle 14 has a front part 19, a rear surface 20 and an edge (FIG. 4).
  • a bracket 8 affixed to the frame of the loom there are mounted mechanisms for controlling gripper shuttle 14, i.e., a braking box 9, a picker 10, a control mechanism 11, a rotary shuttle box 12, and a pneumatic ejecting mechanism 13.
  • the loom is driven by a motor 15, which drives via transmission 16 an electromagnetic clutch-brake mechanism 17 mounted on shaft 2 and frame 1.
  • an electromagnetic clutch-brake mechanism 17 mounted on shaft 2 and frame 1.
  • the mechanism 17 operates as a clutch.
  • the mechanism 17 operates as a brake which stops the loom.
  • the braking box 9 (FIG. 2) and picker 10 are movable along the shuttle box 12, and are further movable in a direction perpendicular to the shuttle box 12 so as to be able to move away or deviate from the gripper shuttle 14 at the time of its ejection.
  • the braking box 9 and the picker 10 are fastened at the ends of respective two arm levers 21 and 22 swingable in the plane of the paper of FIG. 2 about pins 24, 25 on a transverse carrier 23 which is mounted by means of pins 31 in bearings in bracket 8.
  • the lower ends (FIG. 2) of two arm levers 21, 22 are provided with pins 26, 27 and cam following rollers which are guided by box cams 29, 30 in the control drum 28 which controls thereby the motions of the braking box 9 of shuttle box 12 and the picker 10.
  • the deviation of the braking box 9 with the picker 10 upon ejection of the gripper shuttle 14 from the shuttle box 12 is controlled by a radial or face cam 32 which controls via a cam follower roller 34 on a lever 33 the transverse carrier 23 for the two arm levers 21, 22.
  • the positive contact of radial cam 32 and roller at all times is achieved by means of a coil tension spring 35.
  • the braking box 9 (FIG. 3) is formed by a hollow body or housing 44 which carries on a pin 45 a swingable pawl 46, the braking box further comprising springs 47 at the left and a spring 48 at the right, which press the wedge-shaped braking jaw 49 upwardly until its outwardly flanged side edges 50 engage the inwardly flanged side edges 51 (FIG. 9) of hollow body 44.
  • a further spring 52 holds the swingable pawl 46 in such manner, that between edge 70 of gripper shuttle l4 and the finger 53 of the swingable pawl 44 there is formed a clearance T
  • the swingable pawl 46 is provided with a surface 69 (FIG. 4). The swinging motion of this pawl 46 is limited by stop 66 inside hollow body 44, which is provided with a projection 67.
  • the shape of finger 58 of the swingable pawl 46 is shown in FIG. 10.
  • Picker 10 is formed by a picker body 56 which carries a buffer 54 on a pin 55, the buffer being supported by a rubber block 57 (FIG. 10). Opposite to the holder of picker 10 there is mounted a trigger rod 36 which passes through guideway 37 in bracket 8. Spring 38 holds rod 36 inside the pit of the lower arm ofa first class lever 39 (FIG. 2) of which the other arm releases the lock 40 of the pneumatic mechanism 13 for ejecting gripper shuttle 14.
  • control mechanism 11 is, for the purpose of clarity shown turned through 90 relative to FIG. 2 into the plane of the drawing.
  • Said mechanism which is fastened to bracket 8 comprises a pivot pin 61 and a feeler in the form of a first-class lever, of which the upper arm is positioned against the front 58 of swingable pawl 46 and the lower arm engages switch 62.
  • the said lower arm of feeler 60 cooperates with a Shuttle box 12 is rotatable about an axis which is perpendicular to the plane of the paper in FIG. 2, the shuttle box being rotated upon feeding a new weft thread into gripper shuttle 14. Because gripper shuttle 14 is onesided, it must be turned for each insertion with its front part in the direction towards the shed.
  • the electric circuit 71 and switch 62 of electromagnetic clutch-brake 17 is completed by power source 72 and terminals 73, to which there are connected the circuit of warp and weft stop motions (not shown) and the stop (also not shown) press button.
  • the two switches 62 (of both the left and right control mechanism 11) are connected in series with other circuit elements.
  • the not shown stop press button has a parallel arch controlled by a cam (not shown), and thus the loom can be stopped only when slay 5 is in its rear dead center position.
  • the weft thread to be inserted is denoted by reference character 74; in FIG. 7, the warp of the selvedge of the fabric being formed is denoted by reference character 75.
  • the device of the invention operates as follows.
  • the gripper shuttle 14 upon arrival at the right side of the loom (FIG. 3) passes under the finger 53 of the swingable pawl 46, which is located a distance Y from the edge of gripper shuttle 14 and enters a wedgelike narrowing gap formed between the plate 41, the bottom 42 of shuttle box 12, and the friction surface 68 of braking jaw 49.
  • the wedge-like braking jaw 49 is made of elastic, light material, and thus upon the enter-- ing of gripper shuttle 14 into said gap of the braking jaw 49 does not recoil; as a consequence, the friction surface 68 thus firmly contacts the whole surface of edge 70 of gripper shuttle 14.
  • the gripper shuttle 14 is intensively braked by the friction between the bottom 42 of shuttle box 12 and the bottom surface of the shuttle and by the friction between the friction surface 68 of braking jaw 49 and the surface of the edge 70 of the shuttle, i.e. on its two parallely arranged surfaces.
  • the side guideways 43 only guides the gripper shuttle 14 for the purpose of keeping it from deviating from its direction.
  • the penetrating gripper shuttle 14 moves the wedge shaped braking jaw 49 inthe direction opposite to the action of springs 47 and 48.
  • the spring 48 begins to act at its other end upon arm 59 of swingable pawl 46, overcomes the force of spring 52, and turns the swingable pawl 46 through a distance Y until the finger 53 of said pawl bears against edge 70 of gripper shuttle 14 (FIG. 4).
  • the gripper shuttle l4 continues its motion to the right (FIG. 3) and the wedge shaped braking jaw 49 is thus moved further by its action against the resistance of spring 48, the bias of which further increases.
  • the total distance of turning Y Y is greater than the distance X (FIG. 3) of the overlap of the front 58 of swingable pawl 46 and the feeler 60 of control mechanism 11, for a distance X (FIG. 5).
  • the relation is as follows: I Y X X
  • the front of swingable pawl 46 passes beside the arm of feeler 60 at a distance X and the operation of the loom is carried on.
  • the second purpose of the swingable pawl 46 is thus that by its position it controls the presence of gripper shuttle l4 and limits, moreover, the movement of the gripper shuttle upon its being returned into the shed by picker 10.
  • the gripper shuttle 14 After inserting a new weft thread into gripper shuttle l4 and its turning for together with gripper box 12 while the braking box 9 and picker 10 are simul taneoulsy moved away from each other, the gripper shuttle 14 is ejected into the shed.
  • the impulse to the ejection is given by movement of picker 10 in its operative stroke in the direction of arrow F (FIG. 7). and is transmitted to the lock 40 of the pneumatic ejecting device 13 by rod 36 and rocker lever 39 (FIG. 2). No further mechanism is necessary for causing said inpulse of the picker.
  • the blocked control mechanism 11 reminds the attendant that the failure must first be removed, and them, by pressing hand lever 63, the control mechanism 11 is to be released. Only afterwards can the loom be started.
  • a failure as mentioned under 3) might take place, e.g., by an increased resistance of the weft 74 to be inserted. That means that the gripper shuttle 14 has a delay upon running through the shed, and at the moment of displacement of braking box 9 in the direction of arrow C is only in the position as shown in FIG. 4. Because of this, the control mechanism stops the loom but the gripper shuttle 14 still reaches its correct position. The attendant of the loom need only then release the control mechanism 11 and start the loom.
  • control mechanism 11 It follows from the above description of the control mechanism 11, that said mechanism is at rest during normal operation of the loom and further, that it does not require a special drive, because the mechanism controlling the braking box 9, or picker l0, respectively, is used.
  • the deviation in a radial direction away from the shuttle box 12 of the two arm levers 21 and 22 which at their free ends carry the braking box 9 and picker 10, is performed by turning their transverse carrier 23.
  • the position of the transverse carrier 23 is controlled by the radial cam 32, on the circumference of which there is at least one radial recess (not shown).
  • roller 34 of lever 33 of the transverse carrier 23 is in said recess, the said two arm levers 21 and 22 are deviated.
  • a device for controlling a gripper shuttle in looms having rotary shuttle boxes on both sides thereof, each shuttle box having a guideway for the gripper shuttle.
  • said device comprising a braking box disposed parallel with the guideway, the braking box being movable in both radial and longitudinal directions relative to said guideway, said braking box comprising a braking jaw mounted in an elastic medium and a swingable pawl with a free end, the braking box being located beside the edge of said shuttle box.
  • the braking box comprises a plurality of springs, of which at least two springs bear against the bottom of the braking box and supporting the brakingjaw, two further aligned springs mounted above each other one of said further springs bearing against the bottom of the braking box and the other of said further springs supporting the braking jaw, and a swingable pawl having a controlled end disposed between the confronting ends of said two further springs.
  • a device as claimed in claim 1, wherein the braking jaw in the braking box is wedge-shaped and is arranged with its extended end in the direction of picking of the gripper shuttle into shuttle box.
  • a device as claimed in claim 5, comprising a radial cam for operating the lever of the transverse carrier for said two two-arm levers, said radial cam being coupled with the control drum for the two two-arm levers.
  • radial cam for the lever of the transverse carrier for the two two-arm levers is provided at its active surface with at least one radial recess, and in the plane passing through said recess and the axis of rotation to both the radial cam and the control drum there are radial recesses in the cam paths of said control drum, said recesses being directly proportional in the length of their radial to those of the active surface of the recess of the radial cam.

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US460421A 1973-04-18 1974-04-10 Device for controlling gripper shuttles in looms Expired - Lifetime US3875974A (en)

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CS2775A CS163585B1 (en)van) 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
US4082118A (en) * 1976-10-20 1978-04-04 Crompton & Knowles Corporation Pneumatic picking mechanism for looms
US4108215A (en) * 1976-10-20 1978-08-22 Crompton & Knowles Corporation Control mechanism for gripper shuttles
US4294291A (en) * 1980-05-15 1981-10-13 Crompton & Knowles Corporation Shuttle retaining apparatus
US4415010A (en) * 1980-10-24 1983-11-15 Sulzer Brothers Limited Retractor apparatus for a weft-inserting projectile in a weaving machine
US4442870A (en) * 1980-11-07 1984-04-17 Sulzer Brothers Limited Brake for a gripper projectile of a weaving machine
US4757843A (en) * 1987-03-16 1988-07-19 Bellwether, Inc. Shuttle returner apparatus

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 (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082118A (en) * 1976-10-20 1978-04-04 Crompton & Knowles Corporation Pneumatic picking mechanism for looms
US4108215A (en) * 1976-10-20 1978-08-22 Crompton & Knowles Corporation Control mechanism for gripper shuttles
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
US4415010A (en) * 1980-10-24 1983-11-15 Sulzer Brothers Limited Retractor apparatus for a weft-inserting projectile in a weaving machine
US4442870A (en) * 1980-11-07 1984-04-17 Sulzer Brothers Limited Brake for a gripper projectile of a weaving machine
US4757843A (en) * 1987-03-16 1988-07-19 Bellwether, Inc. Shuttle returner apparatus

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