EP0869210A1 - Motorized clutch for operating driven shafts of weaving machines - Google Patents

Motorized clutch for operating driven shafts of weaving machines Download PDF

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Publication number
EP0869210A1
EP0869210A1 EP98200880A EP98200880A EP0869210A1 EP 0869210 A1 EP0869210 A1 EP 0869210A1 EP 98200880 A EP98200880 A EP 98200880A EP 98200880 A EP98200880 A EP 98200880A EP 0869210 A1 EP0869210 A1 EP 0869210A1
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EP
European Patent Office
Prior art keywords
clutch according
clutch
gear wheel
shaft
rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98200880A
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German (de)
French (fr)
Inventor
Piercarlo Boffelli
Erminio Depoli
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Baruffaldi SpA
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Baruffaldi SpA
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Filing date
Publication date
Application filed by Baruffaldi SpA filed Critical Baruffaldi SpA
Publication of EP0869210A1 publication Critical patent/EP0869210A1/en
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/02—General arrangements of driving mechanism

Definitions

  • the present invention relates to a motorized clutch for operating driven shafts of weave machines for weaving looms.
  • Said components for conveying the weft yarns may be of different types, including those of the so-called gripper type and those of the air type, depending on whether the yarn is conveyed by mechanical components, which are called grippers, or by directional jets of compressed air.
  • the components for moving the warp yarns are instead called Jacquard or dobby weave machines and must be movable in synchronism with the former, particularly in the case of gripper looms, so as to form the required fabric design.
  • EP 0,322,928 in the name of the same Applicant discloses, for example, dual-clutch couplings which allow the loom to be coupled with the dobby via the first clutch, or the two of them to be separated so as to connect, via the second clutch, the dobby to an auxiliary moving member by means of which the independent movement of the dobby itself is possible.
  • the technical problem which is posed, therefore, is that of providing a coupling for weaving looms which overcomes these problems and allows moreover any transmission means to be used between the auxiliary motor and the gearing which can be coupled with the driven dobby shaft, in particular transmissions with cylindrical, conical, helical and similar gearings, hydraulic transmissions and the like, depending on requirements.
  • the coupling should consist of a small number of parts which can be easily assembled, so as to result in a lower cost and reduced maintenance, but which at the same time can be connected both to air looms and to auxiliary clutches of gripper looms.
  • a clutch for operating driven shafts of weave machines for weaving looms operated by a drive shaft in which a gear wheel is fastened onto said driven shaft, said clutch comprising a motor, the drive shaft of which is designed to cause rotation of an element for transmission of the movement, axially movable upon actuation of associated actuator means, said element having, connected to it, means designed to be engaged with said gear wheel of the driven shaft so as to cause rotation of the latter.
  • the component for transmission of the movement consists of a drive shaft 10 which connects the weave machine 200 to the loom 100 itself.
  • the motorized clutch 20 comprises an electric motor 21, the casing 21a of which houses a stator 21b and, via bearings 22, a hollow shaft 23 on which the rotor 21c is fixed.
  • An annular electromagnet 30 is also fixed to the casing 21, being arranged in the example coaxially with said hollow shaft 23 and designed to co-operate with a disc 41 screwed onto one end 42a of a spindle 42 coaxially inserted inside said shaft 23 and locked in rotation with respect to the latter, but movable in translation.
  • the recall action of the electromagnet 30 is performed against the opposite thrusting action of a spring 41a arranged between the disc 41 and the hollow shaft 23.
  • a pinion 43 is coaxially fixed to the opposite end 42b of the spindle 42, the teeth 43a of which pinion are designed to engage with corresponding teeth 50 of a gear wheel 5a keyed onto the shaft 10.
  • the said pinion 43 is also radially engaged with resilient means 44 - flexible couplings - arranged between the pinion itself and a bell member 25 integral with the shaft 23. In this way any backlash arising from engagement of the pinion 43 with the gear wheel 50 is absorbed by said resilient means 44.
  • the electromagnet 30 When, on the other hand, slow running is required in order to restore the weft (Fig. 2), the electromagnet 30 is energized, using means known per se, and, overcoming the reaction of the spring 41a, recalls against itself the disc 41, thus causing the simultaneous translation of the spindle 42 inside the hollow shaft 23 and consequent engagement of the pinion with the gear wheel 50 which is integral with the shaft 10 and which, from this point on, is driven by the motorized coupling 20.
  • the motorized part of the coupling 10 may be realized in the form of variants designed to produce variations in the number of revolutions of the motor 20.
  • the shaft 123 of the motor 121 is not concentric with the spindle 23, but parallel with the latter and connected thereto by means of a pair of gearing systems which produce a predetermined reduction ratio and are formed by a first gear wheel 143a, mounted on the drive shaft 123, and a second gear wheel 143b, mounted on the hollow shaft 23 carrying the spindle 42.
  • the variation in speed of the pinion 43 is instead achieved by means of a proper electromagnetic clutch 240 mounted on the hollow shaft 23; said clutch comprises a disc 241 which is axially movable on the hollow shaft 23 and which, recalled alternately by either one of two facing electromagnets 246, is engaged with one gear wheel 243a or the other gear wheel 243b of a pair, which are mounted in sequence on the drive shaft 223, thus producing a different reduction ratio and therefore a different speed of rotation of the pinion 43.
  • Figure 5 illustrates a further example of embodiment of the motorized clutch according to the invention, in which the pinion 143 and the gear wheel 50 have a toothing forming a front-engaging bevel gear which may be useful in those cases where it is necessary to limit the dimensions in the axial direction.
  • Figures 6a,6b,6c show the application of the motorized coupling according to the invention to weaving machines with gripper looms 1000.
  • the motorized coupling 10 causes rotation of a gear wheel 150 integral with a driven dobby shaft 10b separated from the drive shaft 10a.
  • the wheel 150 has a set of radial teeth 150a and a set of front teeth 150b designed to engage with a clutch 2000 mounted on the said drive shaft 10a.
  • Said clutch 2000 comprises a rotor 2001 which surrounds a fixed annular electromagnet 2002 which is integral with a fixed support part and the magnetic field of which acts, by attracting towards the rotor 2001, an engaging ring 2003 made of ferromagnetic material and provided with front teeth 2003b situated opposite the teeth 150b of the gear wheel 150.
  • the electromagnet 2002 when the electromagnet 2002 is energized, it keeps the sets of front teeth 150b and 2003b of the wheel 150 and the ring 2003, respectively, in the disengaged condition, allowing independent rotation of the shafts 10a and 10b.
  • the ring 2003 also has, mounted on it, dowels 2003c arranged in non-symmetrical positions and designed to engage in corresponding holes 150c of the wheel 150 into which they are inserted, when the respective sets of front teeth 150a and 2003a are engaged, thus ensuring a single position of angular coupling between the shaft 10a and the shaft 10b.
  • the positions of the dowels 2003c and the corresponding holes are non-symmetrical so as to allow relative engagement between wheel 150 and ring 2003, with insertion of the dowels 2003c into the holes 150c, in a single angular position, whereas in any other position the dowels 2003c rest on the surface of the wheel 150, so as to keep the ring constantly perpendicular to the axis of the shafts 10a and 10b.
  • the electromagnetic clutch 2000 in the de-energized conditions has the function of rotationally connecting the shaft 10a of the loom to the dobby shaft 10b whereas, when energized, the rotation of one must be disengaged from the other one; in this way the synchronized engagement between the loom and the dobby is maintained, even when there is no power.
  • the motorized clutch 10 has the function of rotationally connecting the shaft 10b to the auxiliary motor 20 and of disengaging rotation of one from the other when the associated electromagnet 30 is not energized.
  • the motorized clutch according to the invention is able to achieve both engagement with the driven shaft and operation of the shaft itself for air-type looms and gripper-type looms, with a substantial reduction in component parts and with evident overall savings in costs, owing to the fact that the element for rotational operation of the driven shaft, in addition to being an element in the kinematic chain, is also the element for engagement with the gear wheel integral with the driven shaft.
  • the motor operating the clutch may be of the hydraulic and/or pneumatic type.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

Clutch for operating driven shafts (10;10b) of weave machines (200) for weaving looms (100;1000) operated by a drive shaft (10;10a), in which a gear wheel (50;150) is fastened onto said driven shaft (10;10b), said clutch comprising a motor (21;121;221), the drive shaft of which is designed to cause rotation of an element (42) for transmission of the movement, axially movable upon actuation of associated actuator means (30), said element (42) having, connected to it, means (43;143) designed to be engaged with said gear wheel (50;150) of the driven shaft (10;10b) so as to cause rotation of the latter.

Description

The present invention relates to a motorized clutch for operating driven shafts of weave machines for weaving looms.
It is known in the art relating to the operation of weaving looms that said looms must be provided with components for conveying the weft yarn(s) and components for moving the yarns forming the warp.
Said components for conveying the weft yarns may be of different types, including those of the so-called gripper type and those of the air type, depending on whether the yarn is conveyed by mechanical components, which are called grippers, or by directional jets of compressed air. The components for moving the warp yarns are instead called Jacquard or dobby weave machines and must be movable in synchronism with the former, particularly in the case of gripper looms, so as to form the required fabric design.
It is also known that, during weaving, breakages of the weft yarn may occur and in these cases, in order to avoid having a defect in the finished piece of cloth, it is necessary to interrupt weaving and, while keeping the components conveying the weft yarn at a standstill, cause backward movement of the dobby, undoing the fabric which has formed from the time the loom has stopped, in order to restore the continuity of the interrupted weft yarn.
While, in the case of an air loom, the operation may be considered relatively simple, in the case of gripper looms it is necessary to separate the dobby from the loom and perform the backward movement thereof into the required position using an auxiliary low-speed drive component.
In order to start the weaving process again it is therefore necessary to restore the coupled condition between loom and dobby, bringing them back into the relative angular position present at the time of their separation, so as to ensure the same synchronism between the relative movements occurring at the time of the interruption.
For this purpose, EP 0,322,928 in the name of the same Applicant discloses, for example, dual-clutch couplings which allow the loom to be coupled with the dobby via the first clutch, or the two of them to be separated so as to connect, via the second clutch, the dobby to an auxiliary moving member by means of which the independent movement of the dobby itself is possible.
Even in the case of air looms in which the said resynchronization operation would not be necessary and in which slow running could be performed directly with the main drive motor, numerous technical problems arise, linked to the fact that said motors and associated control and operating means are costly and, in the presence of multiple-yarn weave machines (Jacquard process) or a large number of machines, it is necessary to use a main motor which, when it is operated at a low number of revs, does not have the starting torque necessary for operating the said machines.
Therefore, even assuming the use of a very powerful main motor, excessively high costs would be incurred in view of the lack of use of the higher power motor during normal fast operation of the looms.
On the other hand the use of a dual-clutch coupling of the known type is also excessively costly and complex in view of the absence of the mechanical grippers to be synchronized.
The technical problem which is posed, therefore, is that of providing a coupling for weaving looms which overcomes these problems and allows moreover any transmission means to be used between the auxiliary motor and the gearing which can be coupled with the driven dobby shaft, in particular transmissions with cylindrical, conical, helical and similar gearings, hydraulic transmissions and the like, depending on requirements.
Within the scope of this problem, a further requirement is that the coupling should consist of a small number of parts which can be easily assembled, so as to result in a lower cost and reduced maintenance, but which at the same time can be connected both to air looms and to auxiliary clutches of gripper looms.
These technical problems are solved according to the present invention by a clutch for operating driven shafts of weave machines for weaving looms operated by a drive shaft, in which a gear wheel is fastened onto said driven shaft, said clutch comprising a motor, the drive shaft of which is designed to cause rotation of an element for transmission of the movement, axially movable upon actuation of associated actuator means, said element having, connected to it, means designed to be engaged with said gear wheel of the driven shaft so as to cause rotation of the latter.
Further details may be obtained from the following description of a non-limiting example of embodiment of the invention provided with reference to the accompanying drawings, in which:
  • Figure 1 shows a cross-section, along a longitudinal plane, of the motorized clutch according to the invention applied to an air loom in the condition where it is disengaged with the latter;
  • Figure 2 shows the motorized clutch according to Fig. 1 in the condition where it is engaged with the shaft of the dobby;
  • Figure 3 shows a first variation of embodiment of the motorized clutch according to the invention;
  • Figure 4 shows a second variation of embodiment of the motorized clutch according to the invention;
  • Figure 5 shows a third variation of embodiment of the motorized clutch according to the invention;
  • Figure 6a shows a cross-section of the motorized clutch according to Fig. 1 applied to a gripper loom during disengagement from the driven shaft;
  • Figure 6a shows a cross-section of the motorized clutch according to Fig. 6a during engagement and transmission of the slow-running movement to the driven shaft;
  • Figure 6c shows a cross-section of the clutch according to Fig. 6a during engagement and transmission of the movement both to the driven shaft and to the drive shaft;
  • Figure 7 shows a variation of an example of embodiment of the means for synchronization of the drive shaft and driven shaft.
    • As illustrated in Figs. 1 and 2, in the case of weaving machines with a compressed-air loom, denoted by 100, the component for transmission of the movement consists of a drive shaft 10 which connects the weave machine 200 to the loom 100 itself.
    In this case the motorized clutch 20 according to the invention comprises an electric motor 21, the casing 21a of which houses a stator 21b and, via bearings 22, a hollow shaft 23 on which the rotor 21c is fixed.
    An annular electromagnet 30 is also fixed to the casing 21, being arranged in the example coaxially with said hollow shaft 23 and designed to co-operate with a disc 41 screwed onto one end 42a of a spindle 42 coaxially inserted inside said shaft 23 and locked in rotation with respect to the latter, but movable in translation.
    The recall action of the electromagnet 30 is performed against the opposite thrusting action of a spring 41a arranged between the disc 41 and the hollow shaft 23. A pinion 43 is coaxially fixed to the opposite end 42b of the spindle 42, the teeth 43a of which pinion are designed to engage with corresponding teeth 50 of a gear wheel 5a keyed onto the shaft 10.
    The said pinion 43 is also radially engaged with resilient means 44 - flexible couplings - arranged between the pinion itself and a bell member 25 integral with the shaft 23. In this way any backlash arising from engagement of the pinion 43 with the gear wheel 50 is absorbed by said resilient means 44.
    In this way, under normal operating conditions (Fig. 1), the electromagnet 30 of the motorized clutch is kept de-energized and therefore the spring 41a acting on the disc 41 causes disengagement of the pinion 43 from the gear wheel 50; the shaft 10 is therefore made to rotate rapidly by the main motor (not shown).
    When, on the other hand, slow running is required in order to restore the weft (Fig. 2), the electromagnet 30 is energized, using means known per se, and, overcoming the reaction of the spring 41a, recalls against itself the disc 41, thus causing the simultaneous translation of the spindle 42 inside the hollow shaft 23 and consequent engagement of the pinion with the gear wheel 50 which is integral with the shaft 10 and which, from this point on, is driven by the motorized coupling 20.
    As illustrated in Figures 3 and 4, the motorized part of the coupling 10 may be realized in the form of variants designed to produce variations in the number of revolutions of the motor 20.
    In Fig. 3, for example, the shaft 123 of the motor 121 is not concentric with the spindle 23, but parallel with the latter and connected thereto by means of a pair of gearing systems which produce a predetermined reduction ratio and are formed by a first gear wheel 143a, mounted on the drive shaft 123, and a second gear wheel 143b, mounted on the hollow shaft 23 carrying the spindle 42.
    By providing the motor with a double winding it is possible in this way to obtain the two desired speeds of rotation.
    In the example according to Fig. 4, the variation in speed of the pinion 43 is instead achieved by means of a proper electromagnetic clutch 240 mounted on the hollow shaft 23; said clutch comprises a disc 241 which is axially movable on the hollow shaft 23 and which, recalled alternately by either one of two facing electromagnets 246, is engaged with one gear wheel 243a or the other gear wheel 243b of a pair, which are mounted in sequence on the drive shaft 223, thus producing a different reduction ratio and therefore a different speed of rotation of the pinion 43.
    Figure 5 illustrates a further example of embodiment of the motorized clutch according to the invention, in which the pinion 143 and the gear wheel 50 have a toothing forming a front-engaging bevel gear which may be useful in those cases where it is necessary to limit the dimensions in the axial direction.
    Figures 6a,6b,6c, on the other hand, show the application of the motorized coupling according to the invention to weaving machines with gripper looms 1000.
    In this case the motorized coupling 10 according to the invention causes rotation of a gear wheel 150 integral with a driven dobby shaft 10b separated from the drive shaft 10a.
    The wheel 150 has a set of radial teeth 150a and a set of front teeth 150b designed to engage with a clutch 2000 mounted on the said drive shaft 10a.
    Said clutch 2000 comprises a rotor 2001 which surrounds a fixed annular electromagnet 2002 which is integral with a fixed support part and the magnetic field of which acts, by attracting towards the rotor 2001, an engaging ring 2003 made of ferromagnetic material and provided with front teeth 2003b situated opposite the teeth 150b of the gear wheel 150.
    Said attraction by the electromagnet occurs in opposition to the thrusting action of springs 2004 arranged between the rotor 2002 and the ring 2003 and with flexing of a flexible annular plate arranged between ring and rotor.
    In this way, when the electromagnet 2002 is energized, it keeps the sets of front teeth 150b and 2003b of the wheel 150 and the ring 2003, respectively, in the disengaged condition, allowing independent rotation of the shafts 10a and 10b.
    The ring 2003 also has, mounted on it, dowels 2003c arranged in non-symmetrical positions and designed to engage in corresponding holes 150c of the wheel 150 into which they are inserted, when the respective sets of front teeth 150a and 2003a are engaged, thus ensuring a single position of angular coupling between the shaft 10a and the shaft 10b.
    Advantageously the positions of the dowels 2003c and the corresponding holes are non-symmetrical so as to allow relative engagement between wheel 150 and ring 2003, with insertion of the dowels 2003c into the holes 150c, in a single angular position, whereas in any other position the dowels 2003c rest on the surface of the wheel 150, so as to keep the ring constantly perpendicular to the axis of the shafts 10a and 10b.
    As is evident from that described above, the electromagnetic clutch 2000 in the de-energized conditions has the function of rotationally connecting the shaft 10a of the loom to the dobby shaft 10b whereas, when energized, the rotation of one must be disengaged from the other one; in this way the synchronized engagement between the loom and the dobby is maintained, even when there is no power.
    The motorized clutch 10, on the other hand, has the function of rotationally connecting the shaft 10b to the auxiliary motor 20 and of disengaging rotation of one from the other when the associated electromagnet 30 is not energized.
    Under normal weaving conditions (Fig. 6a), the clutches 10 and 2000 are both in the non-energized conditions and consequently the shafts 10a and 10b are rotationally connected together by means of the gear wheel 150 and the ring 2003, thus achieving synchronized operation of the loom and the dobby.
    In the event of breakage of the weft yarn (Fig. 6b), the loom 1000 is stopped and the dobby 200 is disengaged from the shaft 10a by energizing the clutch 2000, which therefore assumes the open position; the electromagnet 30 of the motorized clutch 10 is therefore energized and the latter therefore rotationally engages the pinion 43 with the gear wheel 150, causing slow running of the operating shaft 10b of the dobby 200.
    In order to resume weaving it is necessary to bring the shafts 10b and 10a back into the angular configuration which they had during the stroke prior to stoppage; for this purpose the electromagnet 30 is kept energized so that the shaft 10b is made to rotate by the wheel 150 in the opposite direction to the previous weaving direction and the electromagnet 2002 is de-energized so that (Fig. 6c) the springs 2004 push the ring 2003, which has stopped rotating, against the wheel 150 causing the studs 2003c to lightly touch the associated front surface until they are located opposite the corresponding holes 150c and penetrate inside them, causing immediately closing of the clutch 2000 and locking together again, in the correct relative angular positiion prior to interruption of operation, the shafts 10a and 10b; at the same time as the closing movement of the clutch 2000, the motorized clutch 10 is de-energized, thus leaving loom 1000 and dobby 200 engaged so that weaving can be resumed.
    A similar result may be obtained using sets of front teeth with asymmetrical teeth 3150b/3003b, as illustrated in Fig. 7.
    It is therefore obvious how the motorized clutch according to the invention is able to achieve both engagement with the driven shaft and operation of the shaft itself for air-type looms and gripper-type looms, with a substantial reduction in component parts and with evident overall savings in costs, owing to the fact that the element for rotational operation of the driven shaft, in addition to being an element in the kinematic chain, is also the element for engagement with the gear wheel integral with the driven shaft.
    It is envisaged moreover that the motor operating the clutch may be of the hydraulic and/or pneumatic type.

    Claims (22)

    1. Clutch for operating driven shafts (10;10b) of weave machines (200) for weaving looms (100;1000) operated by a drive shaft (10;10a), in which a gear wheel (50;150) is fastened onto said driven shaft (10; 10b), characterized in that it comprises a motor (21;121;221), the drive shaft of which is designed to cause rotation of an element (42) for transmission of the movement, axially movable upon actuation of associated actuator means (30), said element (42) having, connected to it, means (43;143) designed to be engaged with said gear wheel (50;150) of the driven shaft (10;10b) so as to cause rotation of the latter.
    2. Clutch according to Claim 1, characterized in that said element (42) for transmission of the movement is a spindle (42).
    3. Clutch according to Claim 2, characterized in that said spindle (42) is coaxially arranged inside a hollow shaft (23) which is axially fixed and with which it is locked in rotation, but with respect to which it is axially movable.
    4. Clutch according to Claim 2, characterized in that the end (42a) of said spindle (42) opposite to that (42b) supporting said means (43;143) for operation of the gear wheel (50;150) has, connected to it, means (41,41a) designed to co-operate with corresponding devices (30) for performing translation of the said spindle (42) so as to cause engagement/disengagement of said means (43) with/from the gear wheel (50;150).
    5. Clutch according to Claim 4, characterized in that said means designed to co-operate with the devices for performing translation of the spindle (42) consist of a disc (41) associated with a resilient element (41a) arranged between said disc (41) and hollow shaft (23).
    6. Clutch according to Claim 1, characterized in that said devices for performing translation of the spindle (42) consist of an electromagnet (30) designed to recall axially, if energized, said means (41) integral with the spindle (42) against the reaction of said resilient means (41a).
    7. Clutch according to Claim 1, characterized in that said devices for performing translation of the spindle (42) are of the hydraulic or mechanical type.
    8. Clutch according to Claim 1, characterized in that said means for engagement with the gear wheel (50;150) consist of a pinion (43) with its axis of rotation parallel to the axis of rotation of the gear wheel itself.
    9. Clutch according to Claim 1, characterized in that said means for engagement with the gear wheel (50;150) consist of a pinion (143) with its axis of rotation perpendicular to the axis of rotation of the gear wheel itself.
    10. Clutch according to Claim 9, characterized in that said pinion (143) and gear wheel (150) form a bevel gearing.
    11. Clutch according to Claim 1, characterized in that the shaft of the motor (21) coincides with said hollow shaft (23) of the clutch.
    12. Clutch according to Claim 1, characterized in that the shaft (123;223) of the motor (121;221) of the clutch is parallel to said hollow shaft (23).
    13. Clutch according to Claim 1, characterized in that said motor (21;121;221) has means for varying the speed of rotation of the spindle (23).
    14. Clutch according to Claim 13, characterized in that said means for varying the speed of rotation consist of a double winding of the electric motor and a pair of gearings (143a,143b) mounted on the drive shaft (123) and on the hollow shaft (23), respectively.
    15. Clutch according to Claims 12 and 13, characterized in that said means for varying the speed of rotation consist of a pair of gearings (243a,243b) coaxially mounted on the drive shaft (223) and an electromagnetic clutch (241,246) mounted on the hollow shaft (23).
    16. Clutch according to Claim 3, characterized in that said hollow shaft (23) is integral with a bell member (25) coaxial with the pinion (43), resilient shock-absorbing means (44) being radially arranged between said bell member and said pinion.
    17. Clutch according to Claim 1, characterized in that said loom is an air loom (100).
    18. Clutch according to Claim 1, characterized in that said loom is a gripper loom (1000).
    19. Clutch according to Claims 1 and 18, characterized in that said wheel (150) integral with the driven shaft (10b) has front teeth (150b) designed to engage with corresponding front teeth (2003b) on a ring (2003) of an electromagnetic clutch (2000), integral with the drive shaft (10a) of the gripper loom (1000).
    20. Clutch according to Claim 18, characterized in that said gear wheel (150) integral with the driven shaft (10b) has asymmetrical seats (150c) formed on its front surface opposite the said ring (2003) of the clutch (2000).
    21. Clutch according to Claim 18, characterized in that said ring (2003) of the electromagnetic clutch (2000) has reliefs (2003c) designed to penetrate into the said seats (150c) of the gear wheel (150) so as to achieve angular synchronization of the drive shaft (10a) and the driven shaft (10b).
    22. Clutch according to Claim 18, characterized in that said ring (2003) of the electromagnetic clutch (2000) and said gear wheel (150) have respective sets of asymmetrical front teeth (3150b,3003b) so as to achieve angular synchronization of the drive shaft (10a) and the driven shaft (10b).
    EP98200880A 1997-03-28 1998-03-19 Motorized clutch for operating driven shafts of weaving machines Withdrawn EP0869210A1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    IT97MI000743A IT1290504B1 (en) 1997-03-28 1997-03-28 MOTORIZED CLUTCH FOR DRIVING DRIVEN SHAFTS OF TEXTILE MACHINES
    ITMI970743 1997-03-28

    Publications (1)

    Publication Number Publication Date
    EP0869210A1 true EP0869210A1 (en) 1998-10-07

    Family

    ID=11376697

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98200880A Withdrawn EP0869210A1 (en) 1997-03-28 1998-03-19 Motorized clutch for operating driven shafts of weaving machines

    Country Status (3)

    Country Link
    EP (1) EP0869210A1 (en)
    CZ (1) CZ90398A3 (en)
    IT (1) IT1290504B1 (en)

    Citations (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP0161012A1 (en) * 1984-04-06 1985-11-13 Picanol N.V. Shot seeking mechanism for weaving looms
    BE905315A (en) * 1986-08-22 1987-02-23 Picanol Nv Caught warp thread freeing system - moves shuttle while keeping gap open
    EP0322928A1 (en) * 1987-12-30 1989-07-05 Baruffaldi S.P.A. Coupling with two clutches, especially for looms

    Patent Citations (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP0161012A1 (en) * 1984-04-06 1985-11-13 Picanol N.V. Shot seeking mechanism for weaving looms
    BE905315A (en) * 1986-08-22 1987-02-23 Picanol Nv Caught warp thread freeing system - moves shuttle while keeping gap open
    EP0322928A1 (en) * 1987-12-30 1989-07-05 Baruffaldi S.P.A. Coupling with two clutches, especially for looms

    Also Published As

    Publication number Publication date
    CZ90398A3 (en) 1998-10-14
    IT1290504B1 (en) 1998-12-04
    ITMI970743A1 (en) 1998-09-28

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