US3386477A - Hydraulic drive means for the weft inserting means in needle loom - Google Patents

Hydraulic drive means for the weft inserting means in needle loom Download PDF

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Publication number
US3386477A
US3386477A US534063A US53406366A US3386477A US 3386477 A US3386477 A US 3386477A US 534063 A US534063 A US 534063A US 53406366 A US53406366 A US 53406366A US 3386477 A US3386477 A US 3386477A
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needle
loom
clamp
shed
hydraulic
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US534063A
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Durand Marcel
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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
    • 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
    • D03D47/20—Constructional features of the thread-engaging device on the inserters
    • D03D47/23—Thread grippers
    • 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

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  • the loom in accordance with the present invention is characterized by the fact that at least the movement of the needle is controlled by a hydraulic servomotor.
  • Mechanically driven needle looms have constituted a certain advance over shuttle looms by making it possible to increase to a certain extent the multiplicity of use of the loom without however achieving universality.
  • any reduction in the stroke of the needle is substantially symmetrical With respect to the axis of the fabric, which makes it necessary to displace the filling engagement point and which results in a complicating of the filling selection means and of the related thread clamping and cutting means.
  • the duration of the stroke is related to the duration of the cycle so that a decrease in the stroke results in:
  • the primary object of the invention is to provide a fluid operated mechanism connected to the needle of the loom to impart a reciprocating movement to said needle and a control valve main operatively connected to energy storage means imparting a snap action to said valve means in both directions of movement.
  • the hydraulic servo-motor for the control of the needle comprises adjustable means such as a stop which make it possible to vary the length of the stroke of the needle without displacing the point of engagement of the filling by the needle.
  • adjustable means such as a stop which make it possible to vary the length of the stroke of the needle without displacing the point of engagement of the filling by the needle.
  • the hydraulic servo-motor is com trolled by a snap-action distributor valve, either that it is calculated or piloted in a manner known per se so that any intermediate position between the operating positions is a position of unstable equilibrium or, in accordance with a special feature of the invention, the control device of the distributor valve comprises an energy storage device, means for suddenly liberating the energy stored in the storage device at predetermined moments and means for recocking the energy storage device.
  • the distributor valve operates in response to the liberation of this energy and this liberation can advantageously be brought about, in accordance with a feature of the invention, by the use of electromagnetic interlock devices such as electromagnets or equivalent electric motors, for instance torque motors.
  • the movements of the lay and of the darby are controlled by hydraulic servo-motors which, in their turn, are controlled by snap-action distributor valves actuated by energy storage devices comprising electromechanical interlocking devices such as electromagnets or torque motors and an electric or electronic programming device exciting the different electromechanical interlocking devices.
  • the hydraulic control of the lay and of the movement of the frames further increases the universal nature of the loom and considerably simplifies the coordination between the three movements.
  • This generalizing of the hydraulic control over the shuttleless loom made possible by the present invention has the advantage of making the loom practically silent, which is a problem which cannot be solved with the shuttle loom and can only be partially solved in the mechanically driven shuttleless loom.
  • one or more of the hydraulically controlled members can be provided with an end-of-stroke detection device capable of preventing the starting of the immediately subsequent sequence.
  • the distributor valve slides or the mechanical members always are driven directly without the intervention of energy storing devices by electromagnets which have to supply the entire work. This results in high intensities and response times which are incompatible, in electrical or electronic programs, with a high output.
  • the filling thread is released by the clamp immediately upon its emergence from the shed and this is necessary when the needle still continues its movement outside the shed.
  • this thread By releasing this thread at a speed which is still high, as a result of the elasticity of the thread, it has a tendency to Whip in the open shed, which results in defects in the fabric after the beating up of the pick.
  • the programming device is so arranged as to cause the release of the filling thread by the needle when the latter has stopped outside the shed. With certain very elastic threads, this avoids the shrinkage of the pick within the shed.
  • FIGURE 2 shows schematically a variant of the needle control device
  • FIGURE 4 shows, on a larger scale, details of the drive of FIGURE 3, shown schematically and partially in section;
  • FIGURE 7 shows, in cross-section, the clamping device of the clamp
  • FIGURE 1 shows an embodiment of the invention in which the servo-motor controlling the needle is of the rotary type, with an idle period at the end of one of the strokes, corresponding to the emergence of the needle from the shed.
  • An arm or lever 10 is driven by a rotary motor 11 arranged at the end of the rotating shaft 12.
  • FIGURE 1 the sector 15 is shown in its central position. On both sides of the sector 15 there are then two chambers designated 16 and 17 respectively.
  • the distribution system mounted on the loom frame 150 comprises:
  • a distributor valve 21 having a displaceable valve member 22, which can be actuated by a cam 23 keyed on a shaft 23, the movement of which is strictly synchronized with the other moving parts of the loo-m (this valve member 22 is shown in a neutral position).
  • the displacement of valve member 22 causes the chamber 17 to be connected with the pressurized input fluid and the chamber 16 with the tank. Accordingly, the sector 15 causes the rotation of the lever in the direction which corresponds to the emergence of the needle from the shed, the speed of operating being adjusted by a diaphragm 28. At the rear end of the stroke, the sector remains stationary while the circular position of the cam 23 does not cause any movement of the valve member and the sector. This time of stoppage is adjusted to permit the beating up of the pick by the lay, the fillingholder rod being at this time outside the shed.
  • the valve member 22 resumes its movement in the opposite direction, after having passed through the neutral position and causes the chamber 17 to communicate with the tank and the chamber 16 with the pressurized fluid. Accordingly, the sector 15 causes, during the stroke, the rotation of the lever 10 in the direction which corresponds to the insertion of the needle into the shed the speed of operation being adjusted by a diaphragm 31. At the end of this stroke, the cam 23' again causes the displacement of the valve member 22 which causes the return of the needle in a rearward direction and then the cycle continues as above.
  • the feeding of the yarn has been diagrammatically represented at 152 and 153.
  • the moving sector and the stationary part take up only a very small portion of the complete torus, so that one can very readily obtain a stroke of more than 300, which makes it possible to reduce the size of the drum to a minimum which is still acceptable in order to cause the clamp to pass through the entire shed in fabrics of current 'width,
  • a needle 33 is borne by a flexible blade 34 wound on a drum 35.
  • the drum 35 is keyed on a shaft 36 rotatably mounted on the loom frame 151 on which is fastened the rotary sector 37 of a hydraulic toric servo-motor 38.
  • Two pipes 39 and 40 pass through the stationary sector 41 to connect the servo-motor with a distributor valve as shown in FIGURE 1.
  • FIGURE 2 relates to looms in which there is only a single needle inserted through the entire shed.
  • control by the hydraulic servo-motor can also be applied to looms having a transfer system in which two symmetrical needles each pass through one-half of the shed, whether these needles are driven by a flexible blade or by a rigid rod in accordance with the known kinematic systems.
  • FIGURES 3 and 4 show a hydraulic servo-control having a hydraulic jack of the type having a cylinder and a piston the stroke of which is adjustable and which is controlled by a distribution valve, the displaceable valve member of which is subjected according to a main feature of the invention to the action of energy storage devices, the liberation of the energy being brought about by electromagnets controlled by an electric or electronic programming device which is known per se and will therefore not be described in detail.
  • FIGURE 4 shows details of FIGURE 3 on a larger scale. The interrelation of these figures is facilitated by the fact that they have in common the oscallating arm 85 and the servo-motor 59. f
  • a gripping clamp terminates the lefthand end of a horizontal tubular rigid needle 51.
  • This needle which constitutes the filling insertion member, can pass through the entire shed and the clamp, which is at the lefthand end of its stroke (see position 50 shown in dashed lines), can take up a filling thread at zero speed.
  • This thread the reserve of which, as shown diagrammatically at 152 and 153, is located on the lefthand side of the loom frame 154, is distributed by any suitable known device (not shown) which can select from among several fillings depending on the weave of the fabric to be woven.
  • the needle 51 returns to the rear pulling the filling thread through the entire shed and the clamp releases it upon emerging from said shed (position shown in solid lines).
  • a fixed pulley 60 of diameter D is fixedly mounted on loom frame 154 coaxially with the pin 57, while on the arm 54, coaxially with the pivot 55, there is mounted a pulley 61 fixedly mounted on said arm and having the diameter D/2.
  • the two pulleys 60 and 61 as is already known, may be connected by a chain so as not to have any slippage between the two pulleys.
  • the sequential cycle of the loom determined by the programming device must, as a matter of fact, be as follows:
  • the lay having returned to its rear position of rest, it permits the giving of the order to the needle to enter the shed;
  • a lever 80 pivoted at a fixed point 81 can be engaged by an armature or blade 82 pivoted on a fixed point 83 for maintaining the spring 84 under tension, the force of which is greater than that of the compressed spring 79.
  • This lever 80 is brought into the hooked position represented by a control arm 85 pivoted at a fixed point 86 which carries out a rapid movement from position A to position B with immediate return to position A.
  • This ro tation is obtained mechanically or electrically from the movement itself of the needle drive, as represented diagrammatically in FIGURE 3.
  • This device operates in the following manner:
  • the blade 77 is attracted and the lever 75 is freed and swings in clockwise direction and the valve member 74 is pushed back towards the right by the spring 79 and connects the servomotor 59 with the outlet 73, thus causing the needle to emerge from the shed.
  • the piston 65 of the servo-motor 59 at the end of its stroke will strike against the adjustable stop 93. This stroke is adjustable by displacement of the stop 93 depending on the width of the fabric.
  • An end-ofreturn stroke contact 157 actuated by the lay, closes and energizes the coil '87 which attracts the blade 82 and frees the lever 80 which in its turn, under the action of its spring 84, moves the valve member towards the left in the figure, by pressing against the lever 75.
  • valve member 74 sends the pressure into the servo-motor and causes the insertion of the needle into the shed.
  • means which make it possible to vary the drive pressure of the needle will be provided. This makes it possible to decrease the drive pressure and therefore the speed during the return stroke of the needle, the filling threads being then subjected to gentler treatment.
  • the adjustment of this pressure will be effected in a suitable manner by the programming device which will also determine the movements of the lay and of the darby, if these are also moved in a manner known per se by hydraulic servo-motors.
  • hydraulic controls of the lay and of the dar-by will, in accordance with the invention, preferably be established in a manner similar to that of the drive of the needle, that is to say, they will comprise drive distributing valves for the servomotors of snap action which are under the control of energy storage devices the energy of which can be freed by means of electromechanical interlock devices, which are controlled by the programming device.
  • the programming device will preferably also control other electromechanical devices which, in their turn, via energy storing devices, control moving parts of the loom other than the needle, the lay and the darby, such as the filling grasping clamp, the filling selector and the filling cutting device.
  • FIGURES to 8 An electromechanical control of the clamp in accordance with the invention is shown in FIGURES to 8, FIGURE 5 being an enlarged scale representation of the device shown within the frame 50 of FIGURE 3. It will be noted that purely mechanical programming is impossible to obtain due to the lack of precision introduced by by the cams, etc. in the sequences which last only for a few milliseconds.
  • the movable jaw of the clamp consists of a lever 110 articulated on a pin 111 which is fixed relatively to the body 112 of the clamp.
  • One of the ends 113 of this lever serves to clamp the filling 114 in a U-shaped stationary jaw 115, as represented in FIGURE 7.
  • the lever 110 can, by means of a tooth 116, rest against an interlock blade 117 (FIGURE 5).
  • the latter is articulated on a pin 118 fixed relatively to the body 112 of the clamp.
  • a weak spring 120 brings the blade 117 against a stop 119 which is fixed relatively to the body 112.
  • the lever 110 is under the action of a tension spring 121, one end of which is attached to a fixed point 122 of the body. It is this spring which serves as an energy storage device which is proportioned to the force necessary for the clamping of the filling.
  • a tension spring 121 On the lever 110, there is 10 fastened a lateral recocking finger 123 (FIGURE 6) wlhich passes through a hole 124 provided in the body 1 2.
  • the interlocking blade 117 can free the lever when its end of ferromagnetic material is attracted by an electromagnet 125 mounted on the loom frame at the outside of the shed in the vicinity of the emergence of the clamp which is guided furthermore by a stationary guide 126.
  • FIGURE 7 shows the end 113 of the lever 110 and of the fixed jaw 115 in cross-section.
  • the end 113 has very slight play with respect to the inside of the U formed by the fixed jaw 115, which enables it to wedge the filling 114 against the inner edges of the U without shearing it (see position 113 in dot-dash lines in FIGURE 5).
  • FIGURE 8 shows cam 131 fixedly mounted on the loom frame 154 at the outside of the shed near the out let of the clamp in proximity of the guide 52 (FIG- URE 3).
  • the clamp passes through the shed from right to left, the lever 110 is in the position represented in full lines, in which the clamp is opened and holds the springs 121 tensioned by resting against the blade 117.
  • the shape of the clamp body is such that in this movement of passage through the shed, the warp ends of the open shed which are perpendicular to the path of the clamp cannot be hooked.
  • the filling guided by a movable filling selection finger 132 actuated by the programming device, presents itself obliquely along the dotdash line 114a at a height such that it will be hooked by the nose 133 of the clamp at the end of the forward movement of the latter and will assume the position 1145.
  • the programming device then gives an order to beat up the pick to the lay and then the order to the clamp to pass again through the shed.
  • the necessary force is supplied by the return movement of the clamp and is therefore not limited.
  • a source of hydraulic pressure operatively connected to said needle to impart a reciprocating movement to said needle
  • hydraulic actuated valve means connected to operate said servo-motor means
  • energy storage means operatively connected to said valve means, means to periodically store mechanical energy di rectly derived from said source in said energy storage means, and electrically operated locking means to periodically lock said energy storage means in a stored energy condition and to suddenly liberate said stored energy in both directions of movement of said valve means in response to an electrical tripping signal.
  • a loom as set forth in claim 3 in which said means to periodically store energy in said second energy storage means comprises continuously moving reset means operated in response to the motion of the loom.
  • a loom as set forth in claim 1 further comprising a hydraulically operated and electrically tripped beating-up mechanism, means to sequentially control said mechanism, and means to check the completion of the retracting movement of said needle and to authorize, after said completion, the emission of an electrical signal tripping the movement of said beating-up mechanism.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US534063A 1965-03-27 1966-03-14 Hydraulic drive means for the weft inserting means in needle loom Expired - Lifetime US3386477A (en)

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FR10997A FR1439965A (fr) 1965-03-27 1965-03-27 Métier à tisser sans navette

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3494384A (en) * 1967-01-24 1970-02-10 Jean Amengual Looms
US3610294A (en) * 1967-01-11 1971-10-05 Jean Gusken Maschinenfabrik Ei Weft-inserting rod drive for shuttleless looms
US3613740A (en) * 1968-12-03 1971-10-19 Alsacienne Constr Meca Weft-passing device for a shuttleless loom
US3665975A (en) * 1970-01-19 1972-05-30 Dornier Gmbh Lindauer Weft thread inserting mechanism for looms
EP0207533A1 (fr) * 1985-04-09 1987-01-07 Picanol N.V. Griffes pour métiers à tisser
US20040261881A1 (en) * 2003-03-25 2004-12-30 Texo Ab (A Swedish Corporation) Device for a weaving machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5135757A (fr) * 1974-09-18 1976-03-26 Dornier Gmbh Lindauer
CH639439A5 (de) * 1979-09-05 1983-11-15 Rueti Ag Maschf Greiferkopf fuer webmaschinen mit entnahme des schussfadens von ortsfesten spulen.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1847584A (en) * 1931-06-03 1932-03-01 Crompton & Knowles Loom Works Pneumatic needle motion for axminster looms
US2396815A (en) * 1942-11-05 1946-03-19 Sf Bowser & Co Inc By-pass valve mechanism
US2712429A (en) * 1951-04-28 1955-07-05 Ray William Alton Fluid control valve
US2723681A (en) * 1952-05-12 1955-11-15 Jr William F Macglashan Normally closed solenoid-operated valve with downstream venting when closed
US2817359A (en) * 1954-03-01 1957-12-24 Sanders Associates Inc Hydraulic valve
US2865404A (en) * 1954-06-30 1958-12-23 Eneas G Mascarenhas Copless shuttle loom
US2935046A (en) * 1957-05-23 1960-05-03 Ibm Hydraulic control apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1847584A (en) * 1931-06-03 1932-03-01 Crompton & Knowles Loom Works Pneumatic needle motion for axminster looms
US2396815A (en) * 1942-11-05 1946-03-19 Sf Bowser & Co Inc By-pass valve mechanism
US2712429A (en) * 1951-04-28 1955-07-05 Ray William Alton Fluid control valve
US2723681A (en) * 1952-05-12 1955-11-15 Jr William F Macglashan Normally closed solenoid-operated valve with downstream venting when closed
US2817359A (en) * 1954-03-01 1957-12-24 Sanders Associates Inc Hydraulic valve
US2865404A (en) * 1954-06-30 1958-12-23 Eneas G Mascarenhas Copless shuttle loom
US2935046A (en) * 1957-05-23 1960-05-03 Ibm Hydraulic control apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610294A (en) * 1967-01-11 1971-10-05 Jean Gusken Maschinenfabrik Ei Weft-inserting rod drive for shuttleless looms
US3494384A (en) * 1967-01-24 1970-02-10 Jean Amengual Looms
US3613740A (en) * 1968-12-03 1971-10-19 Alsacienne Constr Meca Weft-passing device for a shuttleless loom
US3665975A (en) * 1970-01-19 1972-05-30 Dornier Gmbh Lindauer Weft thread inserting mechanism for looms
EP0207533A1 (fr) * 1985-04-09 1987-01-07 Picanol N.V. Griffes pour métiers à tisser
US4708174A (en) * 1985-04-09 1987-11-24 N.V. Weefautomaten Picanol Weft gripper for weaving machine
US20040261881A1 (en) * 2003-03-25 2004-12-30 Texo Ab (A Swedish Corporation) Device for a weaving machine
US7231943B2 (en) * 2003-03-25 2007-06-19 Texo Ab Device for a weaving machine

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FR1439965A (fr) 1966-05-27

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