EP0860527B1 - Electronically controlled warp selection system in looms - Google Patents

Electronically controlled warp selection system in looms Download PDF

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Publication number
EP0860527B1
EP0860527B1 EP97121081A EP97121081A EP0860527B1 EP 0860527 B1 EP0860527 B1 EP 0860527B1 EP 97121081 A EP97121081 A EP 97121081A EP 97121081 A EP97121081 A EP 97121081A EP 0860527 B1 EP0860527 B1 EP 0860527B1
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EP
European Patent Office
Prior art keywords
heald
moving
engaging means
bar
electronically controlled
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.)
Expired - Lifetime
Application number
EP97121081A
Other languages
German (de)
French (fr)
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EP0860527A3 (en
EP0860527A2 (en
Inventor
Amos Prof. Weinberger
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.)
Shenkar College of Textile Technology and Fashion
Original Assignee
Shenkar College of Textile Technology and Fashion
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shenkar College of Textile Technology and Fashion filed Critical Shenkar College of Textile Technology and Fashion
Publication of EP0860527A2 publication Critical patent/EP0860527A2/en
Publication of EP0860527A3 publication Critical patent/EP0860527A3/en
Application granted granted Critical
Publication of EP0860527B1 publication Critical patent/EP0860527B1/en
Anticipated expiration legal-status Critical
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/20—Electrically-operated jacquards
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/10—Centre-shed jacquards

Definitions

  • the present invention relates to an electronically controlled warp selection apparatus which integrates the concept of dobby and Jacquard shedding and enables individual selection of warp yarns.
  • Jacquard mechanisms mechanical and electronic, require harness cords to lift the healds which need replacing periodically.
  • the oblique angle of the harness cords and the stability of the harness also restrict the speed of the weaving operation and the harness needs replacing periodically.
  • Dobby mechanisms do not require harness cords but they are limited in fabric design ability and may require a complicated article change procedure when another design is introduced.
  • Patent No. FR 1 380 967 discloses a warp selection mechanism of the same kind of the one set forth in the preamble of claim 1.
  • French Patent 1.380.967 refers to "electronically controlled warp selection mechanism".
  • the pulling of each heald is performed against a spring and the return movement is done by the spring.
  • Each heald has its own driving mechanism and the actuation mechanism can work in pulling or pushing mode.
  • the engagement of the hooks according to this patent is very complicated.
  • French Patent 1048906 describes a totally different concept and mechanism of moving the healds.
  • each heald is engaged and is pulled at will directly by an electromagnet, to perform shedding of the warp yarns.
  • the electromagnet must be powerful enough to pull the heald against the stress of the warp yarn.
  • the selective mechanism is the conventional punched boards.
  • French Patent 1554517 is similar to French Patent 1380967. It claims a device suitable to improve the wear on the holding member and the stop of the heald.
  • EP 0544527 describes a method of moving the healds and controlling such movement which is based on a conventional arrangement of the healds as shown in its Fig. 7(A) - 7(C) and its basic claim (Claim 1). Basically a piezo-electric element is claimed.
  • applicants provide a shedding apparatus that has no harness cords but is still capable of selecting individual warp yarns in manner similar to a Jacquard mechanism.
  • the proposed apparatus consists of healds with warp yarns passing through their eyes.
  • the healds are not connect to a frame or to a cord but can engage either in their top section or their bottom section to a reciprocally moving bar that pulls them up or down respectively.
  • the engaging mechanism consists of a stationary electromagnetic or similar device that induces a linkage between the heald end and the frame section.
  • One way of doing so is by pushing or pulling a swivel arm on the moving bar to clip and engage with the heald.
  • the heald is then pulled up or down and brought back by the arm to the neutral position. Once the movement cycle is completed, a pushing bar disengages the swivel arm from the heald to the other clipped position, toward the electromagnetic device.
  • the operation of the electromagnetic or a similar device is controlled by a microprocessor in a similar manner to an electronic Jacquard. Since each heald is controlled separately, the design can extend to the full width of the fabric.
  • the need to assign an electromagnetic or a similar unit to each heald imposes some restriction on the linear density of these devices. It may be preferred to stack the electromagnetic pushing devices in rows of different heights where consecutive swivel arms of different lengths, mounted on the same moving bar, pushed by electromagnetic units located in different rows.
  • several planes of healds may be used together with their moving bars and the electromagnetic devices, in a similar manner to that used for shafts in a dobby machine. Adjacent warp yarns may then be threaded in different "shafts" of healds.
  • Another aspect of the present invention suggests that in the neutral position all the warp yarns would be at the top or at the bottom position of the shed and only pulling down or up operations would be performed. According to this aspect, the moving bar with the swivel arms must travel twice the distance of the moving bars of the previous aspect.
  • Yet another aspect of the present invention is to connect the bar with the electromagnetic or similar devices to the moving bar. Having the electromagnet traveling with the healds up and down by either of the above aspects simplifies the engaging mechanism of the moving bar to the healds but imposes some strain or the fast vibrating electromagnetic devices and adds weight to the moving mechanism.
  • the present invention is illustrated as embodied on a conventional weaving machine having an electronically controlled warp selection apparatus which enables each of the warp yarns to be controlled. Unlike Jacquard mechanisms, this invention does not necessitate harness cords and all the operations of shedding at performed by positive movements. It is possible to achieve the individual selection of the warp yarns by ascribing an electro-magnetic or a similar unit to each heald
  • the electro-magnet is actuated by a processor that determines the shedding patter hence the design of the fabric.
  • Each heald has at each end an electro-magnet and a hook.
  • the hook When the hook is rocking it engages or disengages with the heald end.
  • Each hook moves up and down reciprocally at a frequency equal to the weft insertion rate.
  • the electro-magnet activates the hook and induces its engagement to the heald end. If the hook engages with the top of the heald, the heald is lifted. If it is the bottom of the heald, it pulls it down. Then the hook returns the heald back to its neutral position. This technique is illustrated in FIGS 1 to 4.
  • FIG. 1 there is shown the warp yarn 1 in a neutral position and clearing bars 10 pushing the latched rocking hooks 7a or 7b to disengage from the heald 2.
  • the stationary electromagnetic unit 5b mounted on an electro-magnetic mounting bar, 4b adjacent to the bottom end 2' of the heald, is actuated by the processor (not shown) to eject the pushing pin 6b which in turn pushes the bottom rocking hook 7b around its fulcrum 8 from its latched disengaged position to the other latched position where it is engaged with the heald 2.
  • FIG. 4 both connector bars 9a and 9b return to their neutral position.
  • the bottom connector bar 9b pushes back the bottom rocking hook 7b together with the heald.
  • FIG. 1 illustrates also the completion of the cycle when the clearing bar 10 pushes the bottom rocking hook 7b from its engaged position with the heald 2.
  • the lifting of the warp yarn is performed in an analogous method when the top electromagnetic unit 5a is actuated, ejecting the top pushing pin (not shown).
  • a clearing bar disengages all the hooks from the healds.
  • the number of healds per linear length in one frame of rocking hooks and connector bars is limited by the size required for the electromagnetic unit. This number can be increased if adjacent rocking hooks have different lengths which must correspond to the position of the interceptor section of the hook in the heal Adjacent electromagnets would then be situated at different heights and will then have more space.
  • Another technique that may allow for higher warp density is to arrange the sets healds with their rocking hooks, the connector bars and the electromagnetic unit in planes, in a similar pattern to shafts on a conventional dobby machine.
  • the neutral position of the warp yarns is arranged in a plane forming an obtuse angle with the plane of the fabric.
  • Such configuration results in a movement of the healds in one direction only; up and back or down and back which utilizes only one set of electro-magnets and hooks located next to the top or the bottom end of the healds respectively.
  • FIG. 5 Another aspect of the present invention refers to a mechanism which consists of a spring loaded hook with its connector bar linked to the bar of the electro-magnetic units and moves together with it.
  • FIG. 5 where the bottom end of the heald is engaged to the hook and moves down with it and with the electro-magnetic unit.
  • This apparatus simplifies the engagement mechanism of the hook to the heald. It necessitates a fast reciprocating movement of the electromagnets.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)

Description

    FIELD OF THE INVENTION
  • The present invention relates to an electronically controlled warp selection apparatus which integrates the concept of dobby and Jacquard shedding and enables individual selection of warp yarns.
    • BACKGROUND OF THE INVENTION
  • Jacquard mechanisms, mechanical and electronic, require harness cords to lift the healds which need replacing periodically. The oblique angle of the harness cords and the stability of the harness also restrict the speed of the weaving operation and the harness needs replacing periodically.
  • Large repeating patterns in the weft direction require a large number of hooks which may necessitate a multi-bloc machine with an intricate harness cord arrangement.
  • Dobby mechanisms do not require harness cords but they are limited in fabric design ability and may require a complicated article change procedure when another design is introduced.
  • Patent No. FR 1 380 967 discloses a warp selection mechanism of the same kind of the one set forth in the preamble of claim 1.
  • In order to eliminate the harness without losing the ability to select warp yarns individually, an integration of both concepts is proposed.
  • French Patent 1.380.967 refers to "electronically controlled warp selection mechanism". In the mechanism disclosed in this patent the pulling of each heald is performed against a spring and the return movement is done by the spring. Each heald has its own driving mechanism and the actuation mechanism can work in pulling or pushing mode.
    The engagement of the hooks according to this patent is very complicated.
  • French Patent 1048906 describes a totally different concept and mechanism of moving the healds. In this patent, each heald is engaged and is pulled at will directly by an electromagnet, to perform shedding of the warp yarns. The electromagnet must be powerful enough to pull the heald against the stress of the warp yarn. The selective mechanism is the conventional punched boards.
  • French Patent 1554517 is similar to French Patent 1380967. It claims a device suitable to improve the wear on the holding member and the stop of the heald.
  • EP 0544527 describes a method of moving the healds and controlling such movement which is based on a conventional arrangement of the healds as shown in its Fig. 7(A) - 7(C) and its basic claim (Claim 1).
    Basically a piezo-electric element is claimed.
    • DISCLOSURE OF THE INVENTION
  • In accordance with the present invention, applicants provide a shedding apparatus that has no harness cords but is still capable of selecting individual warp yarns in manner similar to a Jacquard mechanism.
  • According to one aspect of the present invention the proposed apparatus consists of healds with warp yarns passing through their eyes. The healds are not connect to a frame or to a cord but can engage either in their top section or their bottom section to a reciprocally moving bar that pulls them up or down respectively. The engaging mechanism consists of a stationary electromagnetic or similar device that induces a linkage between the heald end and the frame section. One way of doing so is by pushing or pulling a swivel arm on the moving bar to clip and engage with the heald. The heald is then pulled up or down and brought back by the arm to the neutral position. Once the movement cycle is completed, a pushing bar disengages the swivel arm from the heald to the other clipped position, toward the electromagnetic device. The operation of the electromagnetic or a similar device is controlled by a microprocessor in a similar manner to an electronic Jacquard. Since each heald is controlled separately, the design can extend to the full width of the fabric.
  • The need to assign an electromagnetic or a similar unit to each heald imposes some restriction on the linear density of these devices. It may be preferred to stack the electromagnetic pushing devices in rows of different heights where consecutive swivel arms of different lengths, mounted on the same moving bar, pushed by electromagnetic units located in different rows. In addition, several planes of healds may be used together with their moving bars and the electromagnetic devices, in a similar manner to that used for shafts in a dobby machine. Adjacent warp yarns may then be threaded in different "shafts" of healds.
    Another aspect of the present invention suggests that in the neutral position all the warp yarns would be at the top or at the bottom position of the shed and only pulling down or up operations would be performed. According to this aspect, the moving bar with the swivel arms must travel twice the distance of the moving bars of the previous aspect.
  • This may result in slowing the weaving operation but it simplifies the mechanism in having only one moving bar and eliminates the need for warp tension compensation during the shedding cycle.
  • Yet another aspect of the present invention is to connect the bar with the electromagnetic or similar devices to the moving bar. Having the electromagnet traveling with the healds up and down by either of the above aspects simplifies the engaging mechanism of the moving bar to the healds but imposes some strain or the fast vibrating electromagnetic devices and adds weight to the moving mechanism.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • FIG. 1. shows a schematic side view of a heald at neutral position disengaged from both rocking hooks,
    • FIG. 2 shows a schematic side view of the bottom part of a heald being engaged to the rocking hook by the pushing pin of the electromagnet unit,
    • FIG. 3 shows a schematic side view of a heald being pulled down by the bottom connector bar connected to the rocking hook and forming a shed,
    • FIG. 4 shows a schematic side view of a heald being pushed back to its neutral position by the connector bar and the rocking hook to its neutral position,
    • FIG. 5 shows a schematic view of hooks directly connected to the electromagnets bar and moving together with it.
    DETAILED DESCRIPTION OF THE INVENTION
  • The present invention is illustrated as embodied on a conventional weaving machine having an electronically controlled warp selection apparatus which enables each of the warp yarns to be controlled. Unlike Jacquard mechanisms, this invention does not necessitate harness cords and all the operations of shedding at performed by positive movements. It is possible to achieve the individual selection of the warp yarns by ascribing an electro-magnetic or a similar unit to each heald The electro-magnet is actuated by a processor that determines the shedding patter hence the design of the fabric.
    According to one technique of the present invention there are stationary bars with electro-magnets or similar devices mounted on them in a row. Opposite to each electro-magnet there is a hook that can rock on a fulcrum. Each heald has at each end an electro-magnet and a hook. When the hook is rocking it engages or disengages with the heald end. Each hook moves up and down reciprocally at a frequency equal to the weft insertion rate. The electro-magnet activates the hook and induces its engagement to the heald end. If the hook engages with the top of the heald, the heald is lifted. If it is the bottom of the heald, it pulls it down. Then the hook returns the heald back to its neutral position.
    This technique is illustrated in FIGS 1 to 4.
  • Referring to FIG. 1, there is shown the warp yarn 1 in a neutral position and clearing bars 10 pushing the latched rocking hooks 7a or 7b to disengage from the heald 2.
  • In FIG. 2 the stationary electromagnetic unit 5b, mounted on an electro-magnetic mounting bar, 4b adjacent to the bottom end 2' of the heald, is actuated by the processor (not shown) to eject the pushing pin 6b which in turn pushes the bottom rocking hook 7b around its fulcrum 8 from its latched disengaged position to the other latched position where it is engaged with the heald 2.
  • In FIG. 3 the top connector bar (not shown moves up and the bottom connector bar 9b pulls the bottom rocking hook 7b and the engaged heald down forming a shed. At this point, the weft arm (not shown) is inserted above the warp yarn.
  • In FIG. 4 both connector bars 9a and 9b return to their neutral position. The bottom connector bar 9b pushes back the bottom rocking hook 7b together with the heald. FIG. 1 illustrates also the completion of the cycle when the clearing bar 10 pushes the bottom rocking hook 7b from its engaged position with the heald 2.
  • The lifting of the warp yarn is performed in an analogous method when the top electromagnetic unit 5a is actuated, ejecting the top pushing pin (not shown).
    At the end of the cycle, when the heald is in its neutral position, a clearing bar disengages all the hooks from the healds.
  • The number of healds per linear length in one frame of rocking hooks and connector bars is limited by the size required for the electromagnetic unit. This number can be increased if adjacent rocking hooks have different lengths which must correspond to the position of the interceptor section of the hook in the heal Adjacent electromagnets would then be situated at different heights and will then have more space.
    Another technique that may allow for higher warp density is to arrange the sets healds with their rocking hooks, the connector bars and the electromagnetic unit in planes, in a similar pattern to shafts on a conventional dobby machine.
    According to another aspect of the present invention, the neutral position of the warp yarns is arranged in a plane forming an obtuse angle with the plane of the fabric.
  • Such configuration results in a movement of the healds in one direction only; up and back or down and back which utilizes only one set of electro-magnets and hooks located next to the top or the bottom end of the healds respectively.
  • Yet, another aspect of the present invention refers to a mechanism which consists of a spring loaded hook with its connector bar linked to the bar of the electro-magnetic units and moves together with it. Such a technique is illustrated schematically in FIG. 5. where the bottom end of the heald is engaged to the hook and moves down with it and with the electro-magnetic unit. This apparatus simplifies the engagement mechanism of the hook to the heald. It necessitates a fast reciprocating movement of the electromagnets.
    Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the scope of each element identified by way of example by such reference signs.
    • list of reference signs
    • 1
    WARP YARN
    2
    HEALD
    2'
    HEALD END PART
    3
    HEALD BRACKET
    4a
    TOP ELECTROMAGNET MOUNTING BAR
    4b
    BOTTOM ELECTROMAGNETIC MOUNTING BAR
    5a
    TOP ELECTROMAGNETIC UNIT
    5b
    BOTTOM ELECTROMAGNETIC UNIT
    6b
    BOTTOM PUSHING PIN
    7a
    TOP ROCKING HOOK
    7b
    BOTTOM ROCKING HOOK
    8
    FULCRUM
    9
    RECIPROCATING MOVING BAR
    9a
    TOP CONNECTOR
    9b
    BOTTOM CONNECTOR
    10
    CLEARING BAR
    11
    SPRING

Claims (9)

  1. An electronically controlled warp selection mechanism which comprises
    a plurality of healds (2) supported by a plurality of brackets (3) and provided with hooking or engaging end parts (2'), at one or both ends thereof,
    characterized in that it comprises
    two reciprocally moving bars (9a, 9b) each provided with a set of hooking or engaging means being able to engage said end parts (2') of said heald (2), each reciprocally moving bar (9a, 9b) being movable in an upward and a downward direction, and
    electronically controlled units (5a, 5b) being able to engage or disengage said hooking or engaging means of said moving bars (9a, 9b),
    each set of hooking or engaging means comprising swivel arms (7a, 7b) each pivoted on a fulcrum (8) of the respective reciprocally moving bar (9a, 9b), each swivel arm (7a, 7b) comprising a hook engageable and disengageable with one of said end parts (2') of said heald (2) according to the rocking movement of said swivel arm (7a, 7b) on said fulcrum (8) induced by said electronically controlled units (5a, 5b), so as to move said heald (2) upwardly or downwardly and bringing it back to its neutral position by moving said reciprocally moving bar (9a, 9b).
  2. The mechanism as claimed in claim 1, wherein said reciprocally moving bars (9a, 9b) comprise a first moving bar (9a) and a second moving bar (9b), the first moving bar (9a) comprising a first set of said engaging means, the second moving bar (9b) comprising a second set of said engaging means, the first and second moving bars (9a, 9b), the first and second sets of engaging means and said engaging end parts (2') being provided at both ends of said healds (2).
  3. The mechanism as claimed in claim 2 where the first moving bar (9a) and the first set of engaging means are capable to move said heald upwardly and down to its neutral initial position, and the second moving bar (9b) and the second set of engaging means to move said heald (2) down and up to its neutral initial position.
  4. The mechanism as claimed in claims 1 and 2 where one of said sets of engaging means comprises said at least one swivel arm (7a, 7b) for moving said heald (2) in one direction, a spring or a weight being provided for moving said heald (2) to its neutral initial position.
  5. The mechanism as claimed in claim 1 further comprising a pushing bar (10) arranged so as to bring said at least one swivel arm (7a, 7b) off the engagement position with said engaging end parts (2') when each weaving cycle is completed.
  6. The mechanism as claimed in claim 1 wherein said electronically controlled units (5a, 5b) are mounted on said reciprocally moving bars (9a, 9b) so as to move integrally with said reciprocally moving bars (9a, 9b).
  7. The mechanism as claimed in claim 1 or 6, wherein said engaging means comprise a spring (11) arranged at said fulcrum (8) so as to bring said swivel arm (7a, 7b) off the engagement position with said engaging end parts (2') when each weaving cycle is completed.
  8. The mechanism as claimed in claim 1 where the machine is controlled by microprocessor.
  9. The mechanism as claimed in claim 1 where said electronically controlled unit (5a, 5b) is an electro-magnet.
EP97121081A 1996-12-01 1997-12-01 Electronically controlled warp selection system in looms Expired - Lifetime EP0860527B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL11972796A IL119727A (en) 1996-12-01 1996-12-01 Electrically controlled warp selection apparatus in looms
IL11972796 1996-12-01

Publications (3)

Publication Number Publication Date
EP0860527A2 EP0860527A2 (en) 1998-08-26
EP0860527A3 EP0860527A3 (en) 1999-05-19
EP0860527B1 true EP0860527B1 (en) 2006-03-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97121081A Expired - Lifetime EP0860527B1 (en) 1996-12-01 1997-12-01 Electronically controlled warp selection system in looms

Country Status (2)

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EP (1) EP0860527B1 (en)
IL (1) IL119727A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT406965B (en) * 1998-09-17 2000-11-27 Wis Engineering Gmbh & Co Kg DEVICE FOR SPECIALIZING FOR A JACQUARD MACHINE
CN102534922A (en) * 2012-02-28 2012-07-04 张宏亮 Needle selection mechanism of electronic jacquard

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1048906A (en) * 1951-11-07 1953-12-24 Electric armor mechanics
FR1268994A (en) * 1960-10-05 1961-08-04 Improvements to the mechanisms for step formation
FR1380967A (en) * 1964-01-24 1964-12-04 Oerlikon Buehrle Ag Jacquard loom with beams individually controlled by electromagnetic means
CH471256A (en) * 1967-03-10 1969-04-15 Oerlikon Buehrle Ag Jacquard machine with electromagnetically controlled healds
DE2203925A1 (en) * 1972-01-28 1973-08-02 Vaupel Gustav Adolf Magnetic heald control - iron healds polarised magnetically according to program, engage in permanently polarised oscillating bea
JPH07100895B2 (en) * 1991-11-28 1995-11-01 ワックデータサービス株式会社 Loom warp control device

Also Published As

Publication number Publication date
EP0860527A3 (en) 1999-05-19
IL119727A0 (en) 1997-03-18
EP0860527A2 (en) 1998-08-26
IL119727A (en) 2000-06-29

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