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
  • D03C1/00—Dobbies
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
  • D03C1/00—Dobbies
  • D03C1/14—Features common to dobbies of different types
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/14—Pivoting armatures

Definitions

• the present invention relates to dobbies and other weaving mechanics for training the crowd on weaving machines, and it relates more particularly to electromagnetic selection actuating devices which, in conjunction with reading devices, provide control mechanics of this type depending on the weave to be produced on the fabric being woven.
• the document FR-A-2 515 703 (STAUBLI) describes an actuation device of this kind in accordance with the preamble of the independent claim and which comprises a series of electromagnets in number equal to that of the blades of the mechanics, c that is to say amplifier systems and heald frames carried by the weaving machine.
• the electromagnets, fed through the reading device according to the armor program, are gathered on a single chassis which is animated by an oscillating movement linked to that of the mechanics and which carries, at the level of each blade , a pivoting selector associated with elastic means which tend to separate it from the poles of attraction of the electromagnet considered.
• Each selector is thus driven by an alternating movement which approaches and moves it cyclically from the tails of the two actuating members ensuring control of the amplifier system envisaged, the selection between the two members of each pair being effected by electro - corresponding magnet, depending on whether or not it is powered by the mechanical reading device.
• the object of the present invention is more particularly to remedy the aforementioned drawbacks of conventional devices, and this by arranging each pivoting selector so as to give it a coefficient of amplification of movement such that its selective displacement takes place in a clear and precise manner despite a very high air gap value scaled down.
• the invention essentially consists in articulating the movable armature on said selector by its end turned in the direction of the pivot axis thereof, and in associating with this movable armature elastic return means which act on the opposite end in order to maintain the latter in permanent contact with the corresponding pole of the fixed armature of the electromagnet envisaged and, while thus ensuring by reaction the return of the selector to the separated position, to move away the opposite part of this selector from the other pole of said fixed frame, thereby creating the air gap necessary for the operation of the assembly.
• the actuating device according to FIG. 1 is mounted on an oscillating frame formed by two lateral arms 1 connected by a longitudinal cross member 2.
• Each of the arms 1, mounted on a fixed axis 3, is equipped with a roller 4 which suitable elastic means maintain in contact with a rotating cam 5, the two cams of the system thus ensuring the cyclic oscillation of the chassis 1-2 around the axis 3, in the manner illustrated by the arrow F 1 .
• the block is fixed which contains all of the control electromagnets 6 supplied by the reading device (not shown) of the mechanics considered.
• a pivoting selector 7 mounted on a fixed axis 8 which connects the two arms 1 parallel to the cross member 2 of the chassis 1-2.
• the selectors 7 are arranged side by side on the axis 8, with minimal play so as to be arranged opposite the poles of attraction of the different electromagnets 6.
• Each selector 7 is intended to ensure the selective control of one or the other of the two tilting members 9 and 10 which ensure the actuation of the blade considered in mechanics. All of the members 9 are carried by a fixed axis 11 while the pivot axis of the members 10 is advantageously constituted by the tilting axis 3 of the chassis 1-2.
• each selector 7 is equipped, at the level of that of its edges which is turned in the direction of the electromagnet 6, with a movable frame 12 formed by a plate whose face faces away from the frame 6 a -6 b of each electromagnet 6 is integral with a thin strip 12 a introduced into a cavity 7 a formed in the thickness of the body of the selector, advantageously made of synthetic material.
• the end of the bar 12 a which is adjacent to the pivot axis 8 is articulated inside its cavity 7 a on a small pivot 7 b , while the opposite end of the frame 12 receives the permanent action of a spring 13 engaged in a blind housing 7 c of the selector body.
• the tip 7 d which equips each selector 7 opposite the pivot axis 8 is arranged opposite the tail 9 a of the member 9, so that, when in its oscillating movement the chassis 1-2 operates the lowering of the block of electromagnets 6, said tip 7 d comes to bear against the tail 9 a which is thus spaced from the fixed stop 14 against which it was applied by a spring 15 (see fig. 1).
• the tip 7 d is then placed opposite the tail 10 a of the member 10 which is therefore actuated during the oscillating movement of the chassis 1-2.
• the air gap visible in fig. 3 is very small, so that the effect generated by the magnetic flux is very large, which makes it possible to have recourse to electromagnets of reduced dimensions and low consumption. Although this air gap is small, the particular geometry of the device creates an amplifying effect and allows a large displacement at the point 7 d .
• the spring 13 automatically switches the selector 7 from the position according to FIG. 2 to that according to fig. 3.
• the amplitude of the angular displacement of the selector 7 is limited by the bearing of the point 7 d against one or the other of two stops 9 b , respectively 10 b , provided for this purpose at the end of the tails 9 a , 10 has members 9, 10.
• Each selector 7 is advantageously produced by injection and molding of a non-magnetic material, inside which is directly embedded the end of the tip 7 d , made of steel.
• the whole 7-12 is very compact. Its useful stroke is very large and the electromagnet works with very good efficiency, while the inevitable inaccuracies of the system are absorbed by the fact that the movable armature is always in abutment against the fixed armature 6 a -6 b by at least one of its ends.
• Each balance 16 carries at its ends two pivoting coupling hooks 17 which are intended to cooperate with control members 9 and 10, here in the form of tilting hooks that a spring 15 tends to keep elastically applied against fixed stops 18.
• Each selector 7 is equipped with two points 7 d oriented opposite one another in order to ensure the actuation of the members or hooks 9 and 10 coming from, during the oscillating movement of the chassis 1-2, in contact with ranges 9 a , 10 has hooks.
• the electromagnet 6 considered is supplied, the movable armature 12 is attracted against the fixed armature, so that the selector 7 switches around its axis 8 and comes to the oblique position shown in broken lines ; the oscillation of chassis 1-2 continues, but the points 7 d cannot come into contact with the ranges 9 a and 10 a , so that the hooked members 9 and 10 are not controlled.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Power Engineering (AREA)
• Electromagnets (AREA)
• Looms (AREA)
• Knitting Machines (AREA)
• Accommodation For Nursing Or Treatment Tables (AREA)
• Percussion Or Vibration Massage (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=9499449

Family Applications (1)

Country Status (8)

Families Citing this family (6)

Family Cites Families (8)

• 1996
  • 1996-12-31 FR FR9616393A patent/FR2757884B1/fr not_active Expired - Fee Related
• 1997
  • 1997-12-15 US US08/990,793 patent/US5908051A/en not_active Expired - Fee Related
  • 1997-12-23 EP EP97420242A patent/EP0851047B1/fr not_active Expired - Lifetime
  • 1997-12-23 DE DE69701619T patent/DE69701619T2/de not_active Expired - Lifetime
  • 1997-12-23 ES ES97420242T patent/ES2144303T3/es not_active Expired - Lifetime
  • 1997-12-24 JP JP35531897A patent/JP3545186B2/ja not_active Expired - Fee Related
  • 1997-12-30 CN CN97126282A patent/CN1058305C/zh not_active Ceased
  • 1997-12-30 KR KR1019970078657A patent/KR100418082B1/ko not_active IP Right Cessation

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