Classifications

• • 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
  • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
  • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
  • D03D47/3006—Construction of the nozzles
  • D03D47/3013—Main nozzles
• • 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
  • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
  • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
• • 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
  • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
  • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
  • D03D47/3026—Air supply systems
  • D03D47/3033—Controlling the air supply
  • D03D47/3046—Weft yarn selection

Definitions

• the invention relates to a loom with pneumatic weft insertion according to the preamble of claim 1.
• the weaving machine has a reed, which is assigned a guide device with a guide channel for a weft.
• the guide channel is pivotally connected to the reed between an entry position and a stop position for the weft.
• the guide channel in the entry position is associated with a stationary weft insertion device with blowing nozzles, which is thus arranged independently of the reed and thus on the one hand does not affect the movement of the reed and on the other hand is not affected by the movements of the reed itself.
• a pair of scissors is used to cut off the inserted weft thread.
• the nozzles are arranged pivotably in the vertical direction and are driven by a jacquard device and a return spring.
• a jacquard device By means of the jacquard device in pairs two nozzles are presented to the guide channel, in each case only one tuyere is used. Since the scissors cut off the registered weft thread at the entry point at the tuyere, the registered weft thread must be held up to the stop edge by means of a clamping device.
• the clamping device is associated with the reed and is moved with this.
• the clamping device is relatively complicated and prone to failure.
• the height control of the blowing nozzles by means of the jacquard device is also relatively complicated and has only a limited flexibility and accuracy.
• a loom with pneumatic weft insertion in which a plurality of nozzles of a weft insertion device are arranged pivotably in the height direction by means of a drive device to selectively align them to the guide channel.
• the disadvantage is that the weft insertion device are fixedly arranged on the batten and the drive for the nozzles. This not only leads to a complicated drive, but also through the reciprocating movement of the sley together with the weft insertion device to increased Massekraäften. These affect the stroke frequency. The acceleration and deceleration forces associated with the movement also have an adverse effect on the stability of the weft insertion device. To cut off the inserted weft thread, the entire weft insertion device with the sley is moved against a cutting device. A pivoting of the nozzles across the height direction is not available.
• the object of the invention is to improve a loom with pneumatic weft insertion of the type mentioned.
• the object is achieved according to the invention by the characterizing features of claim 1.
• the fact that the nozzles are mounted pivotably in the transverse direction against the scissors and are connected to a separate motor drive device to move the selected nozzle in an exact manner against the scissors is the registered weft practically only then cut when he gets in the scissors. In this way it is possible to place the cutting of the inserted weft thread in the stop region of the weft thread, so that a clamping device is no longer required. This not only simplifies the loom, but also increases the accuracy of picking the weft.
• the drive device is designed so that the cutting of a registered weft thread takes place in the region of the stop edge of the material web.
• the weft thread has already taken a safe position, so that even after cutting a shifting of the weft thread is no longer possible.
• the drive device is designed so that the respectively used blowing nozzle is aligned in the transverse direction at least approximately coaxial with the guide channel.
• the embodiment according to claim 4 is advantageous, according to which the nozzles are further mounted pivotably in the height direction transverse to the transverse direction and driven.
• This drive can be done in a known manner by means of the jacquard device.
• the embodiment according to claim 5 wherein the blowing nozzles are connected to a further separate motor drive device for the height direction to align one of the blowing nozzles in the height direction at least approximately to the guide channel.
• the weft insertion device has a plurality of nozzles arranged in the transverse direction and in the height direction.
• the weaving machine has a control device for the pattern control, which is also connected to each motor drive device for controlling them, so that weft threads of different color or quality can be used depending on the patterned fabric to be created.
• the loom is preferably designed so that the control device prevents in the event of a yarn breakage, that the weft thread is movable into the pair of scissors to discharge the broken weft thread and retighten a new section of the weft thread.
• Figure 1 shows the weaving area of a loom in view of the weft insertion device, when entering a weft thread
• FIG. 2 shows the loom of Figure 1 in a view transverse to the height direction.
• Figure 3 shows the loom of Figure 1 when striking a weft thread and the cutting of the weft thread.
• Figure 4 shows the loom of Figure 3 in top view.
• FIGS. 1 to 4 show, in a schematic representation, the weft insertion region of a weaving machine in a schematic representation, wherein only the parts important for the present invention are shown. All other features of the loom are state of the art.
• Figures 1 and 3 show the weaving area of a weaving machine on the warp threads 2 are moved by means of a shedding device 4, such as a jacquard device to an open shed 6, in which by means of a weft insertion device 8, a weft thread 10 is entered.
• a shedding device 4 such as a jacquard device
• a weft insertion device 8 By means of a reed tes 12, the weft thread 10 is struck at a stop edge 14, so that a web 16 is formed.
• the weft insertion device 8 is of pneumatic design and has a nozzle block 20, which in the present example has eight blowing nozzles 22 which are arranged in pairs in transverse direction Q according to FIG. 4, wherein four pairs of such blowing nozzles are arranged one above the other in the vertical direction H.
• the nozzle block 22 is arranged pivotable about a vertical axis 24 in the transverse direction Q and pivotally mounted about a horizontal axis 26 in the height direction H.
• a first drive device 28 includes a motor 30 which is connected via a lever gear 32 with the blowing nozzles 22.
• a second drive device 34 for pivoting the blowing nozzles 22 in the height direction H is arranged.
• This second drive device in turn has a motor 36, which is connected via a further lever mechanism 38 with the blowing nozzles 22.
• the first drive device 28 and the second drive device 34 are initially used to select one of the blowing nozzles 22 and align coaxially with a guide channel 40 of a guide device 42 which is connected to the reed 12 and serves to guide a registered weft thread 10.
• Stafettendüsen 44 serve to advance the registered weft thread along the guide channel 40th
• the first drive device 28 also serves to move the nozzles 22 against a stationary scissors 46, which is arranged in the region of the stop edge 14 of the web 16 such that the scissors 46 is practically effective only when the registered weft thread 10 practically at the Stop edge 14 is posted, as is apparent from Figures 3 and 4.
• a control device 50 connected to the first and the second drive device 28, 34 serves to control the loom in accordance with the pattern, and thus also the first drive device 28 and the second drive device 34 in order to select the blow nozzle 22 required for the pattern to be created, by means of FIG weft thread 10 required for the pattern is presented. Moreover, the control device also serves to drive the drive directions 28, 34 to control so that the registered weft of the scissors 46 is accurately presented.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Looms (AREA)
• Coating Apparatus (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=36781468

Family Applications (1)

Country Status (11)

Families Citing this family (1)

Family Cites Families (19)

• 2006
  • 2006-06-23 WO PCT/CH2006/000340 patent/WO2007038880A1/fr active Application Filing
  • 2006-06-23 AT AT06741665T patent/ATE425285T1/de not_active IP Right Cessation
  • 2006-06-23 US US11/991,827 patent/US20090272456A1/en not_active Abandoned
  • 2006-06-23 EP EP06741665A patent/EP1943379B1/fr not_active Not-in-force
  • 2006-06-23 CN CNA2006800371378A patent/CN101283133A/zh active Pending
  • 2006-06-23 DE DE502006003130T patent/DE502006003130D1/de not_active Expired - Fee Related
  • 2006-06-23 ES ES06741665T patent/ES2320270T3/es active Active
  • 2006-06-23 KR KR1020087007035A patent/KR20080057249A/ko not_active Application Discontinuation
  • 2006-06-23 JP JP2008533840A patent/JP2009510279A/ja not_active Withdrawn
  • 2006-06-23 BR BRPI0616810-8A patent/BRPI0616810A2/pt not_active IP Right Cessation
  • 2006-07-07 TW TW095124735A patent/TW200714762A/zh unknown

Non-Patent Citations (1)

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