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
  • D03D47/3026—Air supply systems
  • D03D47/306—Construction or details of parts, e.g. valves, ducts
• • 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
  • D03D47/302—Auxiliary 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
  • D03D47/3026—Air supply systems
  • D03D47/3053—Arrangements or lay out of air supply systems

Definitions

• the present invention relates to a valve for use in a fluid loom, and a loom incorporating such a valve.
• the invention is particularly concerned with a loom including weft yarn guide which guides an air flow for 5 directing a weft yarn across a warp sheet.
• a weaving loom including a weft insertion channel which guides a weft yarn across the warp sheet, jet nozzles spaced along the weft insertion channel for introducing jets of fluid into the 10 weft channel for carrying the weft yarn along the channel during insertion, the jet nozzles being arranged in groups of nozzles arranged along the length of the channel, the nozzles of each group communicating with a source of pressurised fluid via a common valve means.
• Figure 1 is an end view of part of a loom incorporating guide teeth and auxiliary jets in accordance with the present invention
• Figure 2 is a side view of the loom shown in Figure 1
• Figure j is a schematic end view of guide teeth and auxiliary jets arranged in accordance with the present invention
• Figures 4a_ - 4f show schematically alternative 25 cross-sectional shapes of the internal wall of the guide teeth;
• Figure 5 is a view similar to Figure 3 of an alternative arrangement according to the present invention.
• Figures 6 - 6_ show alternative shapes of guide teeth.
• an air guide channel 10 30 for weft yarn insertion which extends across the warp sheet 11 of a loom 12.
• the channel 10 is composed of a plurality of individual guide teeth 13 which will be described hereinafter.
• auxiliary air jets 15 Spaced along the channel 10 are auxiliary air jets 15 which are spaced apart by a desired number of guide teeth 13.
• the guide teeth 13 and auxiallary jets 15 are mounted on the beat-up shaft 18 of the loom so as to be located in front of the beat-up reed 19.
• the guide teeth 13 have a base portion 20 which is received in a rebate 21 formed in a support member 22 secured to the beat-up shaft 18.
• the guide teeth include a pair of arms 60, 61 which have internal edges defining the sides and upper confines of the channel.
• the lower confine of the channel is defined by the upper edge of the upper portion 20_a and the base portion 20.
• the lower portion 20b_ of the base portion is-a greater thickness than the remainder of the tooth so that abuting lower portion 20b_ of adjacent teeth serve to space the respective arms 60, 61 of the adjacent teeth apart by a predetermined amount.
• the lower portion 20b_ are provided with projections 2 ⁇ £ on one side and complimentary recesses on the opposite side so that abutting teeth are maintained in correct alignment.
• the teeth 13 are moulded in one piece, from a suitable plastics material.
• the auxiliary air jets 15 are arranged in groups 29 along the lengt ' of the channel 10 wherein the air jets in each group a._-e supplied with air from a common valve 30. Only one group 2J and valve 30 are shown in Figure 2.
• the valves 30 are operated sequentially so that auxiliary jets are operated sequentially along the channel as the weft yarn end travels therealong.
• the auxiliary jets are each mounted on a guide tooth having one arm removed to permit its inclusion.
• the auxiliary jet is moulded with the tooth so that its position may be accurately attained.
• Each cam follower 34 is in the form of a lever having a roller 35 at one end and an abutment face 36 at the other end for operating a plunger 37 in valve 30.
• the lever is biased by a spring 34a so that the
• plunger 37 is normally depressed, in which position the plunger urges a ball 38 against a conical seat 39 surrounding an air inlet port 40 to a chamber 43 in which ball 38 is housed.
• the air inlet port 40 communicates via a conduit 41 with a 5 bore 18a_ within a shaft 18 which is supplied with compressed air.
• the cam 31 operates cam follower 34 to move away from plunger 37 and accordingly air pressure at the inlet port 40 forces the ball 38 away from seat 39 and into contact with a conical seat 45 surrounding the 10 bore housing plunger 37.
• Air from conduit 41 enters chamber 43 and flows via exit ports 46 to auxiliary jets communicating therewith.
• a shaft 50 having a 15 plurality of radial arms 51 for co-operation with the cam followers 34 is provided.
• the radial arms strike the cam-followers to deflect them away from their associated valve 30.
• the guide teeth 13 each have two arms 60, 61 which have internal edges which define opposed sides and top of the channel 10.
• the bottom of the channel 10 is defined by the upper edge of the base portion20.
• the arms 60, 61 have terminal ends spaced apart to define a mouth 63 through which 25 weft yarn may escape from the channel during bea_;-up.
• the auxiliary jets 15 are each provided with a nozzle 65 (see Figure 3) which is arranged to direct a flow of air toward an internal edge 70 of the guide tooth 13a_ adjacent to and downstream of the jet 15 so that a curtain of air 65a_ extends 30 across the mouth 63 of tooth 13a_ to discourage exit of- weft yarn through that mouth.
• a nozzle 65 see Figure 3 which is arranged to direct a flow of air toward an internal edge 70 of the guide tooth 13a_ adjacent to and downstream of the jet 15 so that a curtain of air 65a_ extends 30 across the mouth 63 of tooth 13a_ to discourage exit of- weft yarn through that mouth.
• the nozzle 65 directs a flow of air toward
• the edge 70 defined by arm 60.
• the edge 70 is inclined to the axis of the channel so that it progressively approaches the centre of the channel in the direction of travel of the weft yarn.
• the angle of inclination between the edge 70 and longitudinal axis of the channel is about 10°.
• Edge 10 may alternatively be rounded as shown in Figures 4d_ or 4e_.
• the flow of air is deflected by edge 70 towards internal edge 71 of arm 61.
• This edge 71 can be shaped to encourage air loss between adjacent teeth so as to encourage the main flow of air whilst travelling toward the next auxiliary jet to remain close to edge 71.
• edge 71 Examples of cross sectional edge shapes suitable for edge 71 are illustrated schematically in Figures 4a to 4f. Each of these edges is designed to cause a negative pressure immediately downstream of the tooth to cause turbulence and thus loss of air from channel 10.
• the other internal edges 72 and 73 may be shaped so as to encourage the desired air flow, for instance edge 72 may be inclined in a similar manner to edge 70 so that flow of air impinging on edge 72 is deflected downwardly toward edge 73 and edge 73 may be shaped in a similar manner to edge 71 so that a * >r los* ⁇ is achieved between adjacent teeth at the bottom of channel 10.
• edges 70, 71, 72 and 73 are not essential to have edges 70, 71, 72 and 73 of different shape. They could all be of a shape which allows edge 70 to deflect the air from the nozzle, but which also allows sufficient air escape from all the edges to prevent a pressure build up inside the guides and consequent air escape from gap 63. It will be appreciated that by directing a flow of air against an internal edge for deflecting the flow along the channel, it enables the auxiliary jets no be arranged to direct
• arms 60, 61 are shaped so that the exit mouth 63 does not permit the yarn to exit therethrough should it be
• Figure 6a_ illustrates an alternative guide tooth having a stepped mouth 63 for replacement of the teeth illustrated in
• Figure 6b_ illustrates an alternative guide tooth having a stepped mouth 63 for replacement of the tooth illustrated in Figure 5.
• Figure 6a_ illustrates a tooth which could be used as an alternative for either of the teeth illustrated in Figures 3 and 5.

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

Applications Claiming Priority (2)

Publications (2)

Family

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Family Applications (1)

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• 1982
  • 1982-04-29 JP JP57501413A patent/JPS58500618A/ja active Pending
  • 1982-04-29 EP EP19820901144 patent/EP0077787B1/de not_active Expired
  • 1982-04-29 WO PCT/GB1982/000129 patent/WO1982003877A1/en not_active Ceased
  • 1982-04-29 DE DE8282901144T patent/DE3267369D1/de not_active Expired

Non-Patent Citations (1)

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