Classifications

• • 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
  • D03C1/146—Independent drive motor
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
  • D03D51/02—General arrangements of driving mechanism
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
  • D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
  • D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
  • D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
  • D03D51/085—Extraction of defective weft
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
  • D03D51/18—Automatic stop motions

Definitions

• the invention relates to a method for operating a weaving machine with a shedding machine which has switchable movements of the shed forming means and is driven by a single variable-speed drive which is controlled independently of a variable-speed drive of the loom.
• the shedding machine is such that the movements of the individual shed means - e.g. Heald frames or jacquard boards - individually controlled via an electronic control via electromechanical elements, that can be switched on or off.
• Such shedding machines are known in the art under the name dobby or Jacquard machine.
• a drive of the main shaft of the shedding machine and associated rotating masses of the shedding machine including any existing additional flywheel masses is independent of the switchable movement of the shedding means possible.
• a dobby which works according to this principle is described, for example, in EP 570628 A1.
• a shedding machine in which each shed forming means has its own motor, a shedding machine, as it is based here, requires only a single drive motor.
• An independent motor drive of the shedding machine makes it possible, in certain operating conditions, to cancel the operation of shedding machine and loom, which is essentially synchronous in normal weaving operation.
• both the weaving machine and the shed forming machine have components which, in most cases, are moved non-uniformly by means of gears.
• these are usually the components for sheet stop and possibly components for mechanical weft insertion.
• these are the shed forming means.
• the non-uniform movements of these components cause independently fluctuating mass moments of inertia on the shaft of the respective drive motor. These in turn cause fluctuating speeds over one cycle of weaving and shedding machine.
• these fluctuations fall larger or smaller. This situation is described inter alia in EP 0 893 525 A1.
• weaving and shedding machine with independent drive motors usually over a working cycle only at certain, functionally necessarily required times angle synchronous and physically exactly the same speed. In other angular ranges of a duty cycle can be deviated from this exact synchrony.
• a substantially synchronous operation in this context means that e.g. Within a work cycle, the current speed of the weaving or automatic imaging machine is only 85% of the actual operating speed, but averaged over several working cycles, both machines run at the same operating speed.
• weaving and shedding machine or their drives are equipped in conjunction with the associated electronic control and regulating devices including rotary encoders or other sensors that determine the current position of weaving and shedding machine and a synchronization of the allow both.
• the proposal according to EP 1 328 673 B1 is based on the consideration that the weaving machine is operated during startup of the weaving and shedding machine in such a way that before the first sheet stop with a speed close to or equal to the first Operating speed is no "blank" sheet stops are performed against the binding point of the fabric, because this can lead to an undesirable densification of the fabric and to a micro-roughening of the weft and warp threads at the binding point.
• the present invention is based on the object to shorten the period of time for correcting the malfunction in a malfunction and to avoid shutting down the shedding machine and the associated rotating masses and possibly existing centrifugal masses to a standstill as possible.
• the time is shortened with an open position of the shed further and also less electrical energy is needed because the shedding machine must not be stopped and then put back into operation to resolve a weft break.
• the shedding machine is operated at a high operating speed, e.g. the previous operating speed, continue to operate and, if the weft breakage was successful, transferred without stopping again in the regular weaving.
• the shedding means are suitably switched on or off via a programmable sequencer so that a broken weft thread can be removed and subsequently reinserted.
• the loom is reduced by the control of their own drive in speed and possibly brought to a complete standstill.
• the operating speed of the weaving and shedding machine may need to be different from the operating speed at the last sheet stop before a malfunction at the first sheet stop after a malfunction. This may be due, for example, to the fact that the control of the weaving machine is programmed in such a way that it autonomously lowers the operating speed of the weaving and shedding machine in the event of a large number of consecutive operating faults until fewer malfunctions occur. A reverse process with less frequent malfunctions is of course also conceivable. In addition, there may be other web-technical requirements which require a different operating speed of the weaving and shedding machine at the first sheet stop after a malfunction than at the last sheet stop before the malfunction.
• the speed of the shedding machine prior to the resumption of the regular, pattern-correct weaving to the requirements that the loom control dictates that is, to reduce the speed of the shedding machine within certain limits or increase so that, in the following regular weaving operation, it is essentially synchronized with the weaving machine which is performing the sheet stops, that is, at operating speed.
• This may also include an adjustment of the angular relationship or relative position between loom and shedding machine. It can be done for weaving technical reasons. be necessary to change this angular relationship or relative position in the work cycle of weaving and shedding machine at the time of the closed position of the shed for further regular weaving permanently or from shot to shot.
• the weaving machine is moved during the described process to an e.g. shut down (i.e., sufficiently slow) creep speed.
• creeping speed in the present case is meant speeds that are less than 10% of the normal operating speed.
• the elimination of a malfunction e.g. the weft breakage repair can be done automatically or manually by the weaving staff.
• Automatic weft breakage repair - e.g. by means of air jet - is state of the art in modern looms and need not be described in detail here.
• the desired, pre-programmed in the control and regulating modes, and the speeds of weaving and shedding machine during and after the implementation of measures to remedy a malfunction are preselected by the operator via appropriate input menus or keyboards on the control and regulating device of weaving and shedding machine ,
• the weaving and shedding machine are shut down.
• the shed is then brought by appropriate control of the drive of the shedding machine and appropriate control of the shedding means as soon as possible in a closed position.
• the start of a closed position of the shed can also be done very early, namely while the shedding machine is still shut down, that is, after detecting the malfunction has not come to a standstill. This can be useful, for example, in the event of a breakdown by warp breakage.
• the method according to the invention has particular advantages in the event that the cause of the malfunction is a weft break on the loom.
• a signal generator is provided which detect the position of the input elements and transmit signals to the control of the weaving or shedding machine, which prevent or interrupt a driving of the shedding means as long as there is a risk of collision with the input elements.
• the weaving machine starts thereby, without a shot is registered, that is, the last correctly entered shot learns again a sheet stop - but preferably only this one, what the loom starts within a weaving cycle.
• the shedding means must be brought into the pattern-correct open position of the shed, which was required to enter this last shot into the shed.
• this development of the method is as follows: While carrying out the measures for weft breakage, the shedding machine continues to operate at high working speed and, after the broken weft thread has been removed, brings the shed of the last correctly entered weft thread into an open position So set this weft free. For this purpose, the associated shedding means are switched on or off in a suitable manner. The loom can itself during this process already in the starting phase or it starts only after complete opening of this subject.
• the loom with its drive starts again on the one for the other Web operation desired operating speed and is synchronized by the controller after completion of the measures to correct the malfunction with the independent drive of the shedding machine, which then also runs at this operating speed - so that the weaving operation is continued in the right pattern.
• the weaving machine controller receives a signal during this process that there is no signal before the first sheet stop
• Shot is entered, which is feasible via appropriate electromechanical devices modern rapier or air looms.
• the shedding means must be brought to the shedding machine running and running or creep-operated weaving machine by switching on or off their movement in succession in the pattern-dependent correct open positions of the shed to remove the associated shots.
• the desired sequence of measures for correcting a malfunction which is preprogrammed in the control and regulating device, can be selected by the operator via corresponding input menus or keyboards on the control and regulating device of the weaving and shedding machine.
• FIG. 1 Diagram of the method according to the invention during weft breakage repair
• Figure 3 is a diagram as in Fig. 1, but start with empty shot
• FIG. 4 shows a diagram as in FIG. 1, but showing an optional sequence for
• FIG. 6 shows a diagram as in FIG. 1, in addition a renewed interruption of the operation without the method according to the invention being followed.
• FIG. 7 shows a section through a loom, looking in the weft direction, with a shed, which is formed from warp threads (1), which are deflected by shedding means (2), so that a weft thread (S) can be entered.
• FIG. 1 shows an initially running weaving operation in which the operating speeds n1.1 of the weaving machine and n1.2 of the shed forming machine are the same.
• the weft S_N inserted into the shed N breaks (!), I. he is not registered correctly.
• the closed position of the shedding means which are in motion when shed from shed N to N + 1, is thereby traversed at time t1.1, e.g. 330 ° (in relation to the weaving machine angle, which sweeps over 360 ° in a weaving cycle) is a common practice value for the closed position of the shed.
• the braking process of the loom begins.
• the shed N + 1 is now open.
• the associated weft thread S_N + 1 is not entered here (X), since first of all the incorrectly entered (or broken) weft thread S_N must be eliminated. Therefore, a corresponding control of the shedding means in the shed N is returned.
• the incorrectly recorded weft thread can now be removed manually or by a so-called automatic weft breakage repair.
• the shedding machine has not changed its operating speed n1.2, ie she is still the same with whom she was already operated until the shooting break occurred.
• the drive of the shedding machine must therefore provide no power or torque peak for a braking operation.
• the corresponding time is also saved; only the - because of lower rotational masses or without additional masses faster braking - loom was shut down.
• the weaving machine starts again.
• the point at which the weaving and shedding machine is operated synchronously again at the same speed and in the manner required for the regular weaving operation was placed on the sheet stop, which falls on the point in time t1.4.
• the weft S_N must be entered in good time before t1.3 so that it can move properly through the shed and finally be tied off.
• FIG. 2 shows an initially running weaving operation as shown in FIG.
• time t2.2 which is e.g. can coincide with the sheet stop of the loom, so 360 °, the braking process of the loom begins.
• the weaving machine is braked to a slow speed, i. n2.1 is then> 0.
• the further procedure is analogous to FIG.
• the shedding machine has not changed its operating speed n2.2, i. she is still the same with whom she was already operated until the weft break event. Only the weaving machine, which brakes comparatively much faster, has been braked to the creeping speed.
• the shedding means of the still running shedding machine are preferably successively activated by inputs from the operator on the weaving machine, that all further sheds can be opened and the shots removed, until the first broken weft S_N-i (with i> 0) can be eliminated.
• the weaving machine is restarted; in the correspondingly open shed Ni, the weft thread S_N-i is entered; Time t1.3 indicates the time for the closed position of the shed, which is traversed from Ni to N-i + 1 during the shed change; At time t1.4, the weft thread S_N-i is struck.
• all other compartments are preferably also automatically opened while the shedding machine is running and the weft threads are removed until the first broken weft thread S_N-i (with i> 0) can be removed.
• the loom automatically restarts; either from a standstill or from the slow motion. If it starts from standstill, the point at which the weaving and shedding machine again operates synchronously at the same speed and in the operationally required manner falls to t1.4. Shortly before t1.4, t1.3 is run, which indicates the time when the shed is closed. If it starts from the slow motion, the point at which the weaving and shedding machine again operates synchronously at the same speed and in the operationally required manner falls to t2.4. Shortly before t2.4 t2.3 is run, which indicates the time for the closed position of the shed.
• FIG. 3 initially shows ongoing web operation as in the preceding examples.
• the inserted into the shed N weft S_N breaks, ie it is not entered correctly.
• the braking process of the loom begins.
• the shedding machine has not changed its speed n3.2, ie it is still the same, with which it already was operated until the occurrence of the wreckage event.
• the broken weft thread has been removed, it is changed to the shed N-1, thereby exposing the last weft thread S_N-1 correctly entered.
• FIG. 4 shows a modification of embodiment 1 (FIG. 1) for weaving machines with a mechanical weft insertion system (tape gripper and / or rod gripper-based weft insertion system) or a weft insertion system based on weft protectors or projectiles.
• the shed N + 1 is kept open until changed to the shed N no risk of collision with elements of the weft entry more.
• a means e.g. Position and / or speed sensor, provided that detects the time taken at the time t4.3 standstill of the loom. The standstill position is chosen so that the tape gripper or bar gripper are in completeness outside the shed.
• Figure 5 shows a modification of the embodiment 1 ( Figure 1).
• the modification consists in that the operating speeds n5.1 of the weaving machine and n5.2 of the shed forming machine are different at time t5.4 than at time t5.2.
• t.5.4 is the time of the first sheet stop after entry of the shot S_N, which was previously entered incorrectly and therefore had to be removed; the time t.5.2 corresponds to 1.1.2.
• n5.1, n5.2, as shown, is lower in t.5.4 than in t5.2 often has its practical significance in avoiding contact points.
• t5.1 and t1.1 and t5.3 and t1.3 are the same.
• Figure 6 corresponds to the sequence Figure 1, but also shows a short subsequent stop, which does not lead to the inventive method, which will be apparent from the time t6.5 by a corresponding shutdown of weaving and shedding machine to standstill.
• the weft thread S_N + 3 is no longer entered.
• the shed remains in this example in an open position.
• the control of the shedding machine can also be programmed such that during the Shutdown of weaving and shedding machine, the movement of the shedding means is controlled such that the shed is at standstill of weaving and shedding machine in a closed position.

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

Applications Claiming Priority (1)

Publications (1)

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ID=41353938

Family Applications (1)

Country Status (6)

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• 2009
  • 2009-03-06 JP JP2011552316A patent/JP5635016B2/ja not_active Expired - Fee Related
  • 2009-03-06 CN CN2009801579822A patent/CN102341535B/zh not_active Expired - Fee Related
  • 2009-03-06 US US13/201,345 patent/US8490656B2/en not_active Expired - Fee Related
  • 2009-03-06 EP EP09775842A patent/EP2403983A1/de not_active Withdrawn
  • 2009-03-06 WO PCT/DE2009/000296 patent/WO2010099766A1/de active Application Filing
  • 2009-03-06 RU RU2011140480/12A patent/RU2482230C1/ru not_active IP Right Cessation

Non-Patent Citations (1)

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