FR2542335A1 - METHOD AND DEVICE FOR REMOVING, ON FABRICS, DEFECTS RESULTING FROM THE STOPPING OF THE WEAVING MACHINE - Google Patents

Abstract

THE INVENTION AIMS AT THE WEAVING INDUSTRY ON HIGH-SPEED, SHUTTLE-FREE WEAVING MACHINES, IN WHICH, AT START-UP, THE FIRST FLASHING IS TAKEN WITHOUT INSERTING A WEFT, THE FIRST WEFT IS INSERTED ONLY AT THE SECOND FLASHING, WHEN THE MACHINE IS AT FULL SPEED. THE INVENTION CONSISTS OF INTERPOSING BETWEEN THE INPUT SHAFT 22 OF THE TISSUE INQUIRY REGULATOR 20 AND ITS DRIVE CONTROL 26 A LOST ANGULAR STROKE LINK 30, 34, 36 SUCH THAT THE FABRIC 10 IS NOT DRIVEN FORWARD OR BACKWARD, BY THE REGULATOR DURING ONE OR MORE TURNS AFTER A REVERSE OF THE DIRECTION OF THE MACHINE. THE INVENTION ALLOWS THE ELIMINATION OF FABRIC DEFECTS SUCH AS BARS OR CLEAR.

Description

Method and device for removing defects from tissues

  consecutive to the stop of the weaving machine. The present invention relates to a method and a device for removing, on the tissues, the consequent defects at the end of the weaving machine, in particular when it had to be stopped for

  removing or repairing a weft or warp thread

not broken or defective.

  The invention applies to non-shuttle looms in which the insertion of the

  frame is performed by means of at least one carrier

  weft (called "needle" or "lance") rigid or flexible, or by means of an air jet or water, or at

  means of a launcher or projectile.

  The invention is of particular interest.

  for jobs of this type, at high speed.

  It is well known that each stop on a loom causes, at restarting, a defect in the fabric, due to slow start and deformation of the comb These visible defects on the fabric, such as "bars" or the "clear" are

  even more accentuated on high-speed trades-

  because the machine can not start from the first

  first shot at full speed to insert the first pick and to hit this pick with

  the same force as for previous picks.

  These tissue defects appear in particular

  bind in the case where the machine has been stopped to perform a repair on a warp or weft warp broken or defective Indeed we must return the machine back one or more turns to clear and remove, for example, a defective pick and return to the exact configuration of the crowd that existed at the time of insertion of the defective pick. But it is difficult in this case to bring back, by means other than manual, the fabric to the exact correct position it should

  to occupy at the moment of insertion of the new pick ,.

  which is still a cause of default.

  Indeed the fabric is normally called, being weaved, by a call cylinder which is

  driven from the main shaft of the machine

  by means of a transmission mechanism

called "call regulator".

  Positive call regulators are known

  whose function is to advance the tissue

  weaving and rolling back the same amount when removing one or more broken picks There are also simple call regulators that still allow the fabric to move forward, while for the repair of

  the broken weft it is necessary to

  of a certain quantity, by operating a

  ratchet holding a ratchet wheel.

  On high-speed trades, it is

  now, to minimize bars or clears from insufficient comb strength at the first strike after starting, to perform the first beating without inserting the weft and to insert the first weft only at the second

  in the third, when the man-

  China has taken enough speed.

  But the known call regulators do not allow

  do not automatically stop the advance or the retreat of the fabric, for example, during a repair of a broken warp or warp on the looms.

  to weave at high speed where it is necessary to

  the first pick only at the second stroke of

flying in full speed.

  As a result, at the time of insertion of

  the first pick, if the crowd has resumed

  figurative, the call regulator did not return the fabric to the exact position the fabric should occupy, which leaves

a defect in the fabric.

  The present invention aims to remedy this drawback and makes it possible to eliminate the defects

  consecutive tissue at a machine stop.

  The subject of the invention is a process which

  is interposed between the drive command

  of the call regulator and the input shaft of the regula-

  caller a link with lost

  in the business of doing at least one cycle backwards

  re without the call regulator rolling back the

fabric.

  The invention also relates to a method

  to eliminate stop faults resulting from a frame or warp repair, which consists of

  to perform a specific sequence of reverse

  re and walk ahead of the machine during cer-

  at least some of which the fabric remains without moving. Finally, a subject of the invention is a tissue-regulating device which comprises, between the

  drive control and the input shaft of the

  a lost-race linkage system.

  darisant for at least a fraction of a turn and,

  preferably, during at least one turn, said

  said shaft after a reversal of the machine.

  In a regulating device according to the

  vention, the drive forward or backward of the input shaft of the regulator is achieved by means of

  one or more tocs, which allows to obtain

  before the order report and also according to the name

  number of laps of the fabric during the change of direction of the control of the

call regulator.

  The invention will be better understood by reading

  re of the detailed description that will follow and

  the examination of the attached drawings which represent, by way of non-limiting examples, several modes of

embodiment of the invention.

  FIG. 1 is a schematic view of a part of a weaving machine showing the regulator

of appeal of the fabric.

  Figure 2 shows the control of the

caller of the fabric.

  Figure 3 shows a section of the pulley

  training and coach with his knock.

  Figure 4 is a view of the pulley with

  a second drive stop.

  Figure 5 shows a trainer with

ble toc.

  Figure 6 shows a variant with several

  coaches one behind the other.

  Figure 7 shows an example of a trainer

neur with toc and protrusion.

  Figure 8 shows the different sequences

  for the repair of a weft thread.

  Figure 9 shows the different sequences

  for repairing a warp thread.

  Diagrammatically shown in FIG.

  re 1 a shuttleless fabric machine with: the upper and lower warp yarns 4; the comb 6; a weft thread 8; the formed tissue 10; the call barrel of the fabric 12; the cylinder of

  pressure 14; the barrel 16 on which the fabric is wound

  known. As is known, the call cylinder

  12 is driven by the output shaft 18 of the

  referred to as the "fabric call regulator" whose input shaft 22 is driven from a shaft 24, which may be the main shaft of the

  machine or an auxiliary shaft rotating in synchro-

with the main tree.

  According to the invention, a pulley 26 is

  on the shaft 24 and therefore rotates in synchronism

  with the loom moving forward or

  rear wheel, said pulley 26 rotating in the

  one / a port with the crankshaft It transmits the movement to a toothed belt 28 which drives an idler pulley 30 having a pitch diameter twice that of the pulley 26, the gear ratio is

so one in two.

  This command can be done by any

  known transmissions The idler pulley 30 turns

  pin on bushing 32 mounted on the input shaft

22 of the regulator (Figures 2 and 3).

  The idler pulley 30 carries at least one driving abutment 34 A trainer 36 carrying a

  drive finger or thumb 38 is keyed on the arm

input 22 of the regulator.

  When starting the machine in the forward direction (arrow 40, FIG. 2), the face 34a of the stop 34 is applied against the catch 38 and drives the driver 36 secured to the shaft 22 to ensure the positive drive of the regulator 20 during the

normal operation of the trade.

  In the case of a repair of a weft or warp thread, a step search must be carried out, that is to say, after stopping, return one or more cycles back to the configuration of the crowd where the incident occurred

  see in more detail in the following, it is necessary to

  to remove the bars or clears on start-up, that the regulator can be driven back one or more turns backwards, but

without moving the fabric.

  In the case shown in FIG. 2, where the control ratio is 1/2, when the

  command 24 will turn back, the drive stop

  34 of the pulley 30 will almost make a complete turn in the opposite direction and the face 34 b of the stop 34 will be applied against the toc 38, the difference resulting from the thickness of the stop 34 has no importance on the final result Meanwhile,

  corresponding to two laps of the machine, the regulation

  was not trained and the fabric did not move

of place.

  According to a variant (FIG. 4), a second abutment 34 'diametrically opposite the abutment 34 can be added to the idler pulley 34. In this case, and with the control ratio 1/2 of the pulleys 26, 30, the immobilization of the fabric call regulator

  will only last for one revolution of the machine.

  Another variant that can perform the same function as that just described can be done with a coach 42, 42 'with double tocs 44,

44 '(see Figure 5).

  In the case of a immobilization of the fabric only on a fraction of a turn, one can place

  a drive abutment 34, 34 'at any

  right of the idler pulley 30, as one can also conceive double tocs 42 making between them a

obtuse or acute angle.

  You can also ride several coaches

  46, 46 'in series, not secured to the drive shaft

  the call regulator 22 of the fabric, this in function

  the desired number of towers,

  turely the last driver 36 will be secured to the control shaft 4 of the call controller of the

fabric (Figure 6).

  When two coaches 36, 46 follow each other (FIG. 6), the previous coach 46 may-with a projection 48 and the position of the contact edge 50 appropriate, perform any fraction of a turn (see FIG. 7) Of course out of the scope of the invention, there could be as many tocs as turns to move back or forward, as long as one establishes, between the drive control 24 of the regulator and the input shaft 22 of said regulator a link with lost angular travel disengaging, for at least a fraction of a turn, the regulator of its drive after a reversal of the direction of

machine running.

  The system according to the invention can apply

  all known types of call controllers, such as the positive or simple regulators discussed above, but also to regulators with a known device, referred to as the "controller stop", allowing in normal operation of the trade, to advance the fabric only one pick in two, to obtain a particular aspect of the fabric, the regulator being

  therefore, conversely, stopped one out of every two.

  The method according to the invention will now be described for eliminating stop faults,

  like bars and clears on a loom

  without a high-speed shuttle, following a specific program, for the repair of weft and warp breaks and starting of the loom

  without frame insertion on at least one round of

  third weave, to then insert and hit the

  new pick with the same strength as the predecessors

  said process involving the application of

  caller of the fabric described in the foregoing.

  An example is the case where the

  The latter is of the type described with reference to FIGS. 2 and 3, that is to say in which the loom can turn back twice, after a stop, without the

call cylinder of the fabric does not move.

  It will also be assumed that, from the detection of a case (in frame or in chain), it

  it takes a turn to the job to stop.

  Figure 8 illustrates the sequence of

  The results of the process in the case of stopping on a breakage entregram We have shown the layers of upper and lower warp threads 4, the comb 6 and the weft threads a, b, c already inserted to form

  the fabric The fabric is called from right to left.

  In sequence 1, a broken frame has been

  detected, the faulty frame has, or the end of

  remaining to me, is crossed by the warp threads.

  On the signal of the case detector, the

  tier is stopped automatically and it comes to

  stopping one revolution after the detection of the breakage (se-

  quence 2) in the open crowd position.

  According to the simplified diagram of Figure 8, one could believe, from the examination of the sequence 2, that the defective frame could be withdrawn at this stage But this would be true only in the case of the armor canvas because, in the other armor, the weft remains pinched by other warp threads (not shown).

  We then make two laps in back

  re to the machine After the first turn back

  (sequence 3), the warp threads crossed again

  calf and crowd F exactly belongs to the frame

  The crowd having crossed over the defective

  killer has, it is impossible to remove this one at the

  sequence 3 An additional second round in

  (sequence 4) is therefore necessary to decrease

  crowd and that is when we can withdraw the

defective frame.

  Thanks to the driving device, during these two laps back, the call regulator did not roll back the fabric, the idle pulley 30 having made a turn back without the stop 34 meets the toc 38 sees moreover that the frames a, b, c at sequence 4 occupy the same position as the same frames with the sequences

2 and 3.

  To return the fabric to the right place and fill the void left by the removal of the defective pick, before starting with a new

  pick, you have to move the fabric back one step.

  This is what is represented on the sequence where we make again turn back to the

  machine is used for this the push button pre-

  normally seen on the machine to make it work

blow-by-blow.

  In this turn back, the stop 34 which had come into contact with its face 34b with the toc 38 causes the latter to rotate a turn back The regulator is therefore backing the fabric of a step as seen on the sequence 5 o the

  duit b occupies the same position as in sequence 1.

  The machine is then ready to restart, but as we saw earlier, on the fast looms, the insertion of the first frame must be

  only at the second stroke when the machine

China is in full swing.

  Sequence 6 shows the first turn in front of the machine, without weft insertion, which re-crosses

  the crowd on the frame b while the sequence 7

  be the second turn in front of the machine where the new frame a is inserted in a crowd having exactly the same configuration as in the sequence 1, with the fabric occupying the same position as before the breakage. Indeed, during the first two turns forward (sequences 6 and 7), the pulley 30 - takes a crazy turn without driving the regulator, that is to say without moving the remaining fabric at the position it

had reached sequence 5.

  It can thus be seen that, thanks to the invention, the first pick inserted after a stop is inserted at its exact position, in the exact configuration of the crowd and that it is struck at full speed by

  the comb So we removed the defects of the fabric.

  It is easy to program on the machine

  that the frame break detector automatically stops

  The machine is automatically rotated two laps backwards when the operator arrives in front of his stopped machine, he is in the position of the sequence 4 He just has to remove the bad frame, then to activate the button once. push-button backwards (sequence 5) and finally restart the machine P

normal (sequences 6, 7).

  In the foregoing, the program of sequences has been described in the case of a machine stopping in one revolution after the detection of the breakage, but if the machine needs N braking revolutions after the detection, the sequences are the following N + 1 = Number of automatic revolutions without moving the fabric; N = Number of turns back by push button moving the fabric; N + 1 = Number of starting laps of which N laps

without frame.

  For the repair of chain breaks (see Figure 9), there is no need to roll back the fabric as in the case of the repair of a

breaks in frame.

  In the sequence 1 a breakage in chain has been

  detected, the job stops a lap later

  sequence 2, the control of the control regulator

  pel of the fabric turns in opposite directions for two turns with the mechanism of uncrossing the crowd, the idler pulley 30 with its stop 34 coming off the

  toc 38 runs in a vacuum and does not lead to regular

  Caller ID for two laps of the machine, (see Sequence 3 and 4) The two turns to be rolled back by the crowd, entered in the program, are used to compensate for the additional lap done by the machine from the detection of breakage to the complete stop and the turn to be made by the machine without insertion of a frame. Sequence 5 shows the crossing of the crowd and the starting of the machine by a first

  flapper without frame insertion and sequencing

  this 6 shows the insertion of the-frame to the second

  shot and at full speed after the repair

ration.

  For the chain break, if the trade gets

  in N turns after case detection (and not in one turn), the program is as follows: N + 1 = Number of automatic revolutions without moving the fabric; N + 1 = Number of starting laps of which N laps

without frame.

  Of course, when the machine was stopped

  ted, but without any breakage in frame or in

  chain, we resume, for the restart, the se-

  the operations described in connection with the stop on chain break, thanks to which, after a normal stop, the reworking of the weaving is also done without

create fault on the fabric.

Claims (14)

  Apparatus for suppressing stopping defects, such as bar or light, occurring on woven fabrics by means of a high-speed shuttleless loom in which at least the first starting turn of the loom is performed without insertion frame, the first frame being inserted only at the earliest of the second round of   to be hit by the comb with the same strength.   what the previous frames, said device   being characterized in that it comprises, between the   input signal (22) of the fabric call regulator (20)   and the control member (26) of said interlocking regulator   born in synchronism by the main shaft (24) of the   t * er, a connection system with angular travel   due (30, 34, 38) disengaging said input shaft (22) from the control member (26) for at least a fraction of a turn after each change of direction of the trade.   2 Device according to claim 1,   characterized in that said link system comprises   a pulley (30), which is mounted idle on the input shaft (22) of the regulator and which carries at least   a drive stop (34), and at least one   drag trainer (36, 38) which is wedged on said shaft   (22) and which can cooperate with said stop.   3 Device according to one of the claims   1 or 2, characterized in that said system of   linkage comprises a kinematic chain of   sion (26, 28, 30) having a transmission ratio different from 1/1, preferably 2/1.   4 Device according to one of the claims   2 or 3, characterized in that the system of   connection comprises two stops (34, 34 ').   Device according to one of Claims 2 to 4, characterized in that the connecting system comprises a double drive (42, 42 ') to double toc (44, 44 ').   6 Device according to one of the claims   2 to 4, characterized in that the linkage system comprises a plurality of drivers (36, 46,   46 '), the first (36) of which is wedged onto the shaft of   regulator and the others (46, 46 '),   mounted on said shaft, cooperate with the first mier.   7 Device according to one of the claims   2 to 4, characterized in that at least one of the   coaches (46) carries a protrusion (48) offset by   gully in relation to the coach and adapted   to cooperate with a stop (34) or other neur (46 ').   8 Device according to one of the claims   1 to 7, characterized in that it is applied to   a fabric call regulator (20) of the "positive" type.   9 Device according to one of the claims   1 to 7, characterized in that it is applied to a tissue type regulator (20) of the "simple" type. manual recoil.   Device according to one of the claims   1 to 7, characterized in that it is applied to a call regulator of the fabric (20) of the type "to   regulator stop one out of two ".   11 A method for suppressing defects in   ries, such as bars or clear, produced on the fabrics by a high-speed shuttleless loom, in which the first starting round is performed without inserting the weft, the first frame being inserted at the earliest second turn so as to be struck by the comb with the same force as the previous frames, said method   characterized in that it consists in separating   automatically, for at least a fraction of a turn, the input control (26) of the fabric call regulator (20) from the input shaft (22) of said controller after each direction reversal , thanks to which the fabric is not displaced, neither receding nor in advance, after each inversion of business sense of the trade.   Process according to Claim 11,   characterized by interposing in the transmission   between the input control (26) and the input shaft (2) of the controller (20) a link with a stroke   lost angle (26, 28, 30, 34, 38, 36).   Method according to Claim 12, for eliminating stopping defects on a loom requiring N braking laps after detection   and N + 1 launches, including N laps without   frame, characterized in that the pre-existing connection   quoted has a lost angular stroke spanning N + 1 turns.   14 Process according to claim 13, for eliminating stop faults consecutive to a breakage in frame, characterized in that it consists, after stopping the trade: 1) to return the craft backwards on N + 1 turns, during which the fabric is not pulled back by the regulator; 2) to remove the defective frame; 3) to make the craft return again on N turns, during which the fabric is backed up by the regulator; 4) then to restart the loom forward, with insertion of the first frame only Ni + 1 laps after start, during which the fabric   is not advanced by the regulator.   A method according to claim 13 for suppressing stopping faults consecutive to a   chain break or a normal stoppage of the trade,   characterized in that it consists after the stop of the loom: 1) to return the loom back on N + 1 turns, during which the fabric is not driven back by the regulator   2) to repair the chain, in case   it is broken 3) then to restart the loom forward, with insertion of the first frame only N + 1 laps after start, during which the fabric   is not advanced by the regulator.   16 Process according to one of the claims   14 or 15, characterized in that phase 1 of said method is automatically controlled by the   stop detection device of the craft.