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
  • D03C13/00—Shedding mechanisms not otherwise provided for
• • 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
  • D03C3/205—Independently actuated lifting cords

Definitions

• the present invention relates to a motive assembly for selectively controlling shedding of warp threads in a loom.
• a motive assembly for moving a plurality of warp yams in a loom between upper and lower shed positions, the motive assembly including a plurality of selectively controllable ultrasonic cyclic motors, each of which is drivingly connected to one or a group of said warp yams for moving the warp yarn(s) between upper and lower shed positions.
• the ultrasonic cyclic motor is a piezo motor, preferably operating at a frequency of between 20-140 KHz.
• the motor may be drivingly connected to the warp yam by a rigid elongate heald rod which is driven by the motor.
• the motor may directly contact the elongate heald rod in order to displace it longitudinally.
• the motor may drive the heald rod indirectly via a transmission means such as a drive gear or wheel.
• Figure 1 is a schematic perspective view of a first embodiment according to the present invention
• Figure 2 is a side view of the first embodiment showing additional detail
• Figure 3 is a side view similar to figure 2 showing a modification to the first embodiment.
• Figure 4 is an end view of a second embodiment according to the present invention.
• Figure 5 is a view of the assembly showing a heald rod connected to a harness;
• Figure 6 is a side view of a third embodiment according to the present invention.
• Figure 7 is a side view of a fourth embodiment according to the present invention.
• Figure 8 is a schematic diagram illustrating the principle of operation of an ultrasonic motor as used in the present invention.
• an ultrasonic motor 10 including a casing 11 which houses a drive finger 12.
• the drive finger 12 is arranged to cyclically move along a cyclic path from a retracted position A (as shown) to an extended position B (shown in broken lines) and then whilst in its extended position, to the position C and then retracted to position D and then whilst in its retracted position, to position A.
• the finger 12 is driven at high speed through the cycle of positions A,B,C and D, preferably by piezo-electric elements (not shown) housed within the casing 11.
• the direction of movement through the cycle may be A to B to C to D or may be reversed, viz A to D to C to B depending upon the applied electrical current.
• This type of motor operates at high speeds, typically at cycles of between 20 to 140 KHz.
• the motor typically has a cross-sectional dimension of about 8 mm x 4 mm and a length of about 25 mm.
• a first embodiment 100 of the invention is illustrated in Figures 1 and 2.
• a rigid and elongate rigid heald rod 30 is directly connected to a heald eye 31 through which a single wa ⁇ yarn 32 passes.
• a drive wheel 40 having a frictional surface for frictionally driving the heald rod 30 is provided for movement of the heald rod 30.
• the drive wheel 40 is rotated by a motor 10 driving a shaft 39 upon which wheel 40 is fixedly mounted.
• a reaction roller 41 is resiliently urged towards wheel
• the roller 41 is resiliently urged by biasing means 44 which may be a spring 45 or other compression material. If desired, the roller 41 may be replaced by a static member, such as a ceramic plate, which makes sliding contact with the heald rod 30.
• upper and lower guides 50,51 are provided for guiding longitudinal movement of the heald rod 30.
• the guides 50, 51 not only positively define the longitudinal path of movement of the heald rods but also provide support against lateral flexure of the rod. Such support enables relatively thin heald rods 30 to be used.
• sensing means are provided for cooperation with the heald rod 30 in order to sense the longitudinal position of the heald rod 30 in order to determine when it has reached its upper and/or lower shed position.
• the motor 10 is de-activated with the finger 12 in its extended position. This enables the finger 12 to act as a brake to restrain movement of the heald rod 30.
• the motors 10,10' are arranged to extend in the direction of movement of the heald rod 30. This enables a compact arrangement to be achieved and helps to achieve a high density of warp yarns.
• FIG. 4 A further modification is shown in Figure 4 wherein more than one motor 10 is arranged along the shaft 39. This modification applies to the arrangements shown in both figures 1 and 3.
• the heald rod 30 is shown as being connected to a harness 60 of flexible cords 61. This enables a single heald rod 30 to control movement of a group of warp yarns.
• biasing means 70 for example in the form of a spring or an elastic cord, such as Lycra, is provided for applying tensile forces to the heald rod 30.
• At least a pair of opposed motors 10a and 10b are provided operating on opposite sides of the heald rod 30.
• one or more motors 10 may be positioned to one side only of the heald rod 30 and that a reaction member be located on the other side.
• heald rods and motors 10 may be directly incorporated into a loom or may be incorporated into a separate jacquard machine for siting on a loom.
• the shaft 39 and wheel 40 are of different diameter and so the peripheral speed of the wheel is higher than that of the shaft 39. Typically the ratio is 1:3. However it will be appreciated that the wheel 40 may have the same or smaller diameter than the shaft 39.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Looms (AREA)
• General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10839051

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (2)

Citations (7)

Family Cites Families (3)

• 1998
  • 1998-09-18 GB GBGB9820314.4A patent/GB9820314D0/en not_active Ceased
• 1999
  • 1999-09-17 AU AU61008/99A patent/AU6100899A/en not_active Abandoned
  • 1999-09-17 JP JP2000574326A patent/JP2002526672A/ja active Pending
  • 1999-09-17 EP EP99947622A patent/EP1114213B1/en not_active Expired - Lifetime
  • 1999-09-17 DE DE69910595T patent/DE69910595T2/de not_active Expired - Lifetime
  • 1999-09-17 US US09/787,018 patent/US6470919B1/en not_active Expired - Fee Related
  • 1999-09-17 WO PCT/GB1999/003104 patent/WO2000017431A1/en not_active Ceased

Patent Citations (7)

Also Published As

Similar Documents

Legal Events