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
  • D03D47/34—Handling the weft between bulk storage and weft-inserting means
  • D03D47/36—Measuring and cutting the weft
  • D03D47/361—Drum-type weft feeding devices
  • D03D47/367—Monitoring yarn quantity on the drum
• • 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
  • D03D47/34—Handling the weft between bulk storage and weft-inserting means
  • D03D47/36—Measuring and cutting the weft
  • D03D47/361—Drum-type weft feeding devices
  • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
  • D03D47/363—Construction or control of the yarn retaining devices

Definitions

• the invention relates to a delivery device of the type specified in the preamble of claim 1.
• the second thread control device is a controlled thread clamp arranged downstream of the storage body in the thread path in the draw-off direction of the thread longitudinal sections.
• the storage body is assigned two pin-shaped stop elements which are moved alternately axially and radially in order to initiate or terminate the respective trigger and to measure each longitudinal section.
• a stop element transfers a thread turn representing a longitudinal section to the other stop element, but the free thread end of the stopped thread in the main nozzle of the insertion device of the weaving machine carries out a follow-up movement. Since, as a rule, at least two threads are inserted alternately, and the free end of one thread remains in the insertion device when the other thread is inserted, the free thread end which protrudes too far can then collide with or be damaged by the inserted thread.
• both stop elements operate outside the storage body. The Changing between the work phases with and without winding transfer means inevitably undesirable irregularities in the thread control.
• the tooth-shaped stop element continues to move in the take-off direction after the take-off has ended, so that the free end of the thread in the input device executes an undesired trailing movement.
• a controlled thread clamp is additionally provided downstream of the storage body, which initiates each take-off and prevents the thread from running on after the take-off has ended.
• a controlled thread clamp is provided in order to initiate each take-off and to hold the thread beforehand while the active stop element continues to move.
• the delivery devices according to US 4 132 370, US 449863, DE 30 32 971 A, EP 0250 359 A require, because of the mechanism for controlling the movement of the stop elements in the interior of the storage body, a large storage body with a rule of at least about 120 mm in diameter, which at high thread speed however, produces a pronounced balloon effect in the drawn thread.
• a strong balloon effect does not allow flight times or entry frequencies that do justice to the performance of modern air jet looms.
• the invention has for its object to provide a delivery device of the type mentioned that despite the small-diameter storage body for short flight times and high entry frequencies enables an optimal and uniform thread control without caster movements.
• the at least two stop elements alternately control the initiation and termination of the respective trigger in at least essentially the same mechanical manner and also in essentially the same axial positions of the storage body, so that an optimal and uniform thread control or thread geometry results. Furthermore, since the stop elements, one of which initiates the take-off and the other ends the same take-off, perform these functions essentially in the same plane perpendicular to the axis of the storage body, there is no caster movement of the thread after the take-off has ended. The free thread end of the stopped thread holds its position in the insertion device, e.g. the entry nozzle of the air jet loom until the next entry is correct. A collision of the free thread end with another thread that has just been inserted can be avoided.
• the longitudinal section of the thread is dimensioned very precisely and the same for each entry, as a result of which the weft thread losses can be kept low, since the protrusion of the weft thread on the side of the fabric opposite the entry side can be adjusted optimally short.
• a thread clamp downstream of the storage body is not required, so that difficulties with the thread section between the storage body and such a thread clamp are excluded from the outset.
• Each stop element is expediently moved from the thread dimensioning position in the engagement position through the turns on the storage surface into the stop position. In this way, a disturbing influence of the stop element on the thread movement along the storage surface is avoided, which benefits the uniformity of the thread control even at high winding speeds.
• the movement control of the stop element can be designed simply because it only has the task of placing the stop element in the stop position to initiate the trigger to pull into the release position, and to push the stop element out of the release position back into the thread dimensioning position.
• the return of the stop element in the release position to the position of the thread dimensioning position can take place independently of the thread movement or the thread take-off and is therefore not very time-critical.
• a simple drive, for example only one spring, can be used for this task.
• each stop element it is conceivable to forcibly move each stop element so that it executes a cyclical orbital movement.
• the diameter of the storage body is suitably between only about 25 to about 60 mm, preferably even only between about 30 and 45 mm, and is variable in order to allow the length of each longitudinal section to be adjusted. This smallness of the storage body results in a desirably weak balloon effect in the drawn thread, even at high thread speed.
• the stop positions of the stop elements can be defined by stops which are located either in the storage body or outside the storage body, for example in the movement controls of the stop elements themselves.
• the stops are expediently adjustable.
• the stop elements In order to achieve uniform deduction ratios, with only two stop elements, the stop elements should be offset from one another by approximately 180 ° about the axis of the storage body.
• more than just two stop elements are provided. Then all the provided stop elements are arranged at least approximately regularly distributed around the axis.
• the stop element has a first part connected to the drive devices and a thread control part in the form of a pin which is connected to the first part via a resilient joint.
• the resilient joint serves as a drive device for returning the thread control part in the free order from the location of the stop position to the location of the thread dimension position.
• the resilient joint is preferably elastically biased mainly in the direction of the location of the thread dimensioning position.
• a magnet armature which can be actuated against spring force or a magnet armature which can be actuated bidirectionally advantageously serves as the drive device for the movement of the stop element between the release position and the engagement position.
• a bidirectionally actuable magnet or a magnet armature which can be actuated against spring force can also be used for the back and forth movement between the locations of the stop position and the thread dimensioning position.
• FIG. 1 is a schematic perspective view of part of a delivery device
• Fig. 8 is a schematic section of a motion control of a stop element.
• a delivery device F (FIG. 1) with a thread dimensioning function for a weaving machine (not shown) has a stationary carrier 1, on which a storage body K is arranged.
• the storage body is like a rod cage with axially extending rods 3, the outer surfaces of which define an approximately cylindrical, preferably tapering to the right in FIG. 1, storage surface 4.
• the rods 3 are attached to the carrier 1 with foot parts 5 such that they can be adjusted radially in a certain area (radial adjustment devices 6) in order to be able to vary the outer diameter of the storage body K to adapt to the weaving width.
• the outer diameter d (FIG. 2) of the storage body K is only approximately between 25 and 60 mm, preferably approximately 30 to 45 mm.
• the axial length of the storage surface 4 is greater than the dimension of the outer diameter d.
• a winding member W for example a winding tube carrying an outlet eyelet, which is connected to a hollow drive shaft, not shown.
• the winding body K is assigned a first and a second, in each case pin-shaped, stop element S1, S2, which are not shown in FIG. 8 in FIG. 1 removable, stationary motion controls 15 are arranged.
• the stop elements S1, S2 are moved alternately and as indicated by the curves A, B, e.g. as a function of the rotational movement of the winding element W.
• the curves A, B are mirror-symmetrical with respect to the axis X and essentially identical and run essentially in planes which are oriented radially to the axis X.
• a thread extends from the winding element W to the storage surface 4 and is wound thereon in adjacent windings which move in the axial direction parallel to each other and forward form a thread supply, which is temporarily stored on the winding body K.
• the weaving machine not shown, pulls out of this thread supply, e.g. an air jet weaving machine with a main nozzle, a longitudinal section of the thread for each entry, the first and second stop elements S1, S2, in cooperation, dimensioning the longitudinal section respectively intended for the take-off and initiating or terminating the respective take-off.
• the triggering of the take-off is triggered, for example, by a trigger signal transmitted by the weaving machine.
• the sequence of movements of the first stop element S1 is first explained using curve A.
• the stop element S1 is initially moved radially with respect to the axis X between an engagement position and a release position by its movement control, the engagement position being along the curve part 12, in which the tip of the stop element S1 is in the path of movement of the thread turns on the storage surface 4 or even enters the storage surface 4 (between the webs 3).
• the stop element with its is located along the curve part 9 Tip in the release position in which the tip is outside the path of movement of the thread turns on the storage surface 4 and also outside of the storage surface 4.
• each stop element 51, 52 expediently moves its tip in an axial groove or slot of a rod 3 in order to prevent loops from slipping through.
• the stop element S1 In the engaged position of the stop element S1, it is moved between a thread dimensioning layer 11 and a stop layer 7 in the direction of the arrow, as mentioned, either by the windings themselves or by a drive, not shown.
• the stop element S1 In the release position, the stop element S1 is moved along the curve part 9 from a location 8 corresponding to the stop position 7 to a location 10 corresponding to the thread dimension position 11, specifically by means of a drive device of the movement control.
• the stop element S1 is pulled from the stop position 7 in the direction of the arrow to the location 8.
• the stop element S1 is pushed from the location 10 in the direction of the arrow into the thread dimensioning layer 11.
• the sequence of movements for the second stop element S2 (curve B) is analog, ie it runs along the customer parts 9 '(release position of the second stop element S2) in the direction of the arrow and along the curve part 12' (engagement position) in the direction of the arrow, and from the stop position 7 * to location 8 'or from location 10' to the thread dimensioning position 11 '.
• the two stop elements S1, S2 are moved alternately in such a way that they alternately carry out a thread dimensioning function and initiate the withdrawal or end the withdrawal.
• FIG. 2 illustrates a working phase in which the first stop element S1 has reached a stationary stop 13 in its engagement position in the stop position 7 and has previously stopped the withdrawal of a longitudinal thread section.
• the thread Y which extends over the front end of the storage body K to an insertion device, not shown, for example the main nozzle of an air jet weaving machine, is stopped and remains motionless.
• a large number of thread turns lying next to one another are formed on the storage surface 4, namely through the essentially continuous rotational movement (arrow 2) of the winding element W, the second stop element S2 likewise being in its engagement position and in the movement along the curve part 12 ', so that between the first stop element and the second stop element S2 have a predetermined number of turns which represent a longitudinal section of the thread prepared for take-off. Further thread turns are also present upstream of the second stop element S2.
• a trigger signal is now output in the weaving machine, for example, to which the movement control of the first stop element S1 responds in such a way that the first stop element S1 is pulled back from the stop position 7 to the location 8 of the curve A at the stop 13.
• the second stop element S2 continues to move along the curve part 12 ′ due to the addition of new thread windings.
• the dimensioned longitudinal thread section is now subtracted.
• the second stop element S2 then moves further along the curve part 12 ', so that when practically all of the windings present downstream of the second stop element S2 have been pulled off, it is already in the vicinity or at a stop 13' which is the stop position T of the second Stop element S2 defined.
• the stops 13, 13 ' define the stop layers 7, 7' at least substantially in the same plane E perpendicular to the axis X, i.e. at essentially the same axial positions of the storage surface 4.
• the second stop element S2 has stopped the trigger in its stop position T.
• the thread Y is downstream of the second stop element S2. Upstream of the second stop element S2, new windings continue to be wound up.
• the first stop element S1 moves along the curve part 9 and is already close to the location 10.
• the first stop element S1 is pushed from the location 10 into the thread dimensioning position 11 and into the engagement position (FIG. 5) behind the last thread turn intended for the next take-off and before the next thread turn to be made for another take-off.
• the first stop element S1 By winding the thread turns, the first stop element S1 is immediately moved again along the curve part 12.
• the second stop element S2 is still in its stop position T at the stop 13 ', so that the required number of turns is present between the stop elements S1, S2.
• the thread Y is still there.
• Fig. 6 e.g. the next trigger signal has been emitted by the weaving machine, so that the second stop element S2 is pulled out of the stop position to location 8 'and thus into its release position.
• the next trigger is initiated and the windings present downstream of the first stop element S1, which moves along the curve part 12, are released for triggering and (arrow 14) are withdrawn.
• the first stop element S1 moves further along the curve part 12 in the direction of the stop position 7, which it reaches partly through the wound thread turns and partly through the tension in the thread Y in FIG. 7 and ends the withdrawal.
• the thread control device 15 (FIG. 8) can be the same for both stop elements S1, S2.
• the thread control device 15 has a housing 16 in which a magnetic winding 17 and an iron core 18 are contained. Furthermore, an axially movable magnet armature 19 is provided, a spring 20 being arranged between the iron core 18 and the magnet armature 19, which pushes the magnet armature 19 away from the iron core 18.
• the stop element S1 (S2) consists of a first pin-shaped part 21, which is connected to the magnet armature 19, and a likewise pin-shaped thread control part 22, which is connected to the first part 21 via a resilient joint 23.
• the resilient joint 23 consists, for example, of an elastomer, for example polyurethane, and generates a pretension which acts on the thread control part 22 to form a stop 24, which is indicated, for example, and which defines the thread dimensioning position 11 or 11 ′ shown.
• a weak permanent magnet could temporarily hold the thread control part 22.
• the stop 13 or 13 ' is also provided in the opposite direction, which can be adjustable to define the stop position 7.
• a bidirectionally actuable magnet or an arrangement of two magnets working in opposite directions could also be used to control the movement of the stop element S1 or S2 between the engagement and release positions.
• a movement drive (not shown) which operates in a similar manner as explained above and which controls the axial movements of the thread control part 22 could be provided.

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

Priority Applications (3)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (5)

Citations (4)

• 2002
  • 2002-11-12 DE DE2002152602 patent/DE10252602A1/de not_active Withdrawn
• 2003
  • 2003-11-11 EP EP03789028A patent/EP1560965B1/de not_active Expired - Fee Related
  • 2003-11-11 AU AU2003293674A patent/AU2003293674A1/en not_active Abandoned
  • 2003-11-11 DE DE50309491T patent/DE50309491D1/de not_active Expired - Fee Related
  • 2003-11-11 WO PCT/EP2003/012598 patent/WO2004044295A2/de active IP Right Grant
  • 2003-11-11 CN CN 200380106068 patent/CN1726313A/zh active Pending

Patent Citations (4)

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