FR2606040A1 - DEVICE FOR INSERTING FRAME YARNS ON WORKWEAR WITHOUT SHUTTLE - Google Patents

Abstract

DEVICE FOR THE INSERTION OF THE WEFT THREAD, USED ON SHUTTLE Looms, comprising 15 weft reserve spools, mounted at a fixed post, as well as two lances 5 and 7 moving by oscillation from both sides OF THE FABRIC AND PENETRATING SENSITIVELY AT THE SAME DISTANCE INTO THE CROWD, THE WEFT 54 WHEN THE LANCES ARE ADVANCED TO AROUND THE MIDDLE OF THE CROWD BEING TRANSMITTED AS A SINGLE OR MULTIPLE THREAD BY A HEAD COMMONLY CALLED "ENTRY HEAD" 6 MOUNTED AT THE END OF LANCE 5, AT THE CORRESPONDING HEAD COMMONLY CALLED "EXIT HEAD" 8 OF THE OTHER LANCE 7, THESE HEADS CONTAINING BRANCHES 24 AND 25 PINCHING THE WEFT THREAD. ACCORDING TO THE INVENTION, THE BRANCHETTES 24, 25 ARE POSITIVELY ACTIVATED BY MECHANISMS LOCATED INSIDE THE HEAD FOR GRABING THEN RELEASING THE WEFT.

Description

DEVICE FOR INSERTING FRAME WIRES ON

WEAVING PROFESSIONS WITHOUT SHUTTLE.

  The present invention relates to a device for inserting the weft yarn on the looms without shuttle, comprising two oscillating lances penetrating into

the crowd.

  In the case of such a weft insertion device, there is provided on each side of the loom a spool which is pushed into the crowd from the corresponding side and which is then recalled. The end of the spears that enter the crowd carries a head that captures the weft thread to be inserted into the crowd and guides it during this insertion. The weft yarn is extracted from a spare spool which is placed at

outside the crowd.

  There are already many looms that have a weft yarn extracted from a reserve to a

  clamping device, for example constituted by a mechanism

  spring loaded lever mechanism, commonly referred to as an "inlet head", attached to the end of the lance. This thread is taken by this "head of entry" and brought to a certain distance in the crowd where it is transmitted to the

  head of the other spear, commonly called "head of

  The "head of exit" is also constituted by a

  spring loaded lever mechanism. After the wire has been transmitted from the entrance head to the exit head in the crowd, the wire is pulled through the rest of the crowd by the lance carrying the "exit head", to the other edge of the fabric. The transmission of the wire from the "head of entry" to the head of exit is carried out automatically thanks to a particular form of the two heads. The thread taken by the "entry head" is made in a -2- self-gripping clamp. The retention of the wire by "the output head" is done in a self-locking hook. When the "input head" transmits the wire to the output head, the self-picking hook must catch the wire, wedge it sufficiently to disengage it from the input head. This principle has many disadvantages. The

  wire may be released at any time during its

  because it is insufficiently stuck in one or

  the other of the two heads, thus causing a defect in

  wise. It is also impossible to insert more than one weft thread at a time, while for some fabrics it is necessary to insert several. Particles of thread can accumulate in the head at the level of the areas

  pinching thereby preventing it from

  their function. This translates into a shift in

  wire that can escape from the head.

  Other disadvantages relating to this type of inser-

  tion are mentioned in the French patent 6943669 of December 17, 1969 in the name of DORNIER, such as, for example, difficulty in grasping a wire of large diameter and a

  fine wire with the same clamp, hence the impossibility of

  valiant with combinations of weft yarns.

  The invention described in the patent cited above solves these problems. Indeed, it makes it possible to ensure a positive clamping of the weft, during the setting of the weft thread by the input head and during the exchange of this thread from the input head to the output head in the crowd at

course of insertion.

  According to the invention described in this patent, this result

  tat is obtained because the heads of the spears are equi-

  clamping levers which, to grasp and to

-3-

  berate the weft thread, can be actuated positively-

  from the outside. The lever of the input head, to grip the wire at the entrance of the crowd is actuated by a control lever. For the exchange of the wire in the middle of the crowd, the levers of the input head and the output head are actuated by control levers which

  have to penetrate through the lower sheet of

  the. And this is a major disadvantage. The levers pro-

  void wear on the warp threads, which may

  cause marks in the fabric to the right of these-

  or even breakage of warp threads. On au

  on the other hand, the particles of wire which are detached, fall into the control mechanisms of these levers located below the crowd. 1 results in fouling and

  a rapid deterioration of these.

  The invention aims to overcome these disadvantages and

  intended to enable the realization of a

  weft threads on non-shuttle looms equipped with fixed stock bobbins providing the weft yarn and two oscillating lances engaging in the shed from both ends, the weft being gripped as a single or multiple yarn by the head of the inlet lance and transmitted to the head of the exit lance when they are in the advanced position

in the crowd.

  According to the invention, this result is obtained because the heads of the lances are equipped with twigs

  which are positively actuated by mechanisms

  nisms located inside the head for gripping and releasing the weft thread. Slivant another feature of the object of the invention, these mechanisms are actuated by a rod guided through the lance. This head, head, has a qalet or a pad that comes rolling or sliding on a ramp in the manner of a roller on a cam - 4 thus actuating the branch for the purpose of clamping or releasing the frame. This rod, opposite side of the head, has a cleat which is integral with it, coming into contact against a stop located outside the crowd when the lances are almost fully deployed.

in the crowd.

  Thus thanks to this principle of control of the branches-

  The exchange of the thread from one head to the other is perfectly controlled without any foreign body passing through the layers of threads constituting the crowd. Furthermore,

  several weft threads can be gripped simultaneously

  is lying. The invention and the advantages it brings will however be better understood thanks to the exemplary embodiments given hereinafter by way of indication and not limitation and which are illustrated by the appended diagrams in which: FIG. 1 is a simplified view of a loom; - Figure 2 shows the right spear with the input head; - Figure 2A shows the left lance with the output head; FIG. 3 is a view along section A-A at

level of the pinching area.

  - Figures 4a to 4c show the control mechanism of the branch at the end of the lance; - Figures 5a to 5d describe the operation of the opening system of the branch when taking the wire at the entrance of the crowd; - Figures 6a to fid describe the operation of the opening system of the branch when releasing the wire at the exit of the crowd -5-

  FIGS. 7a and 7b are views describing several

  several possible embodiments of the drawer (28) and the branch (24);

  FIG. 8 is a diagram indicating the function

  ment of a loom according to the invention;

  FIGS. 9a and 9b show another embodiment

  tion of the control mechanisms of the

heads input and output.

  In Figure 1 is shown schematically a loom. On the side of the frame (1) is mounted a drive motor (2) from which are controlled

  all the movements of the profession. From the main tree

  cipal (3), are controlled the drive mechanisms (4) of the lances (5) and (7), the presentation mechanisms (13) of the frame to the input head (6), the cascading boxes ( 9) which give the movement to the comb (10) via the oscillating axis (11) and the levers

  (12), the opening mechanism (16) of the inlet head.

  The driving mechanisms (4) give a movement back and forth to the lances (5) and (7). The lance (5) carries at its end which enters the crowd a head (6) or "head of entry" and the lance (7) a head (8) or "head of exit". The lances are shown on this diagram during their introduction into the crowd substantially halfway. The support (14) carries the reserve coils (15).

  In the case of the loom shown here at

  For example, it is assumed that the weft yarn is always introduced as a single yarn and always on the same side of the machine. When weaving, the yarn

  frame is presented to the input head (6) by the

  tif of presentation (13). For this purpose, the mechanism of

  verture (17) controls the opening of the branch of the - 6 -

  input head and this one can take the weft thread.

  A short time later, the mechanism (17) controls the closure of the branch, the weft yarn is thus clamped by the input head. The spear (5) continues its advance in the crowd simultaneously with the spear (7) which comes to meet him. After the weft thread has been fed through the input head (6) approximately in the middle of the loom, the opening and closing mechanisms of the heads (6) and (8) are respectively actuated by the rods ( 18) and (19) connected to the catches (20) and (21) which come into contact against the stops (22) and (23). The weft thread thus passes from the entry head (6) to the

  output head (8). The spears then made their maximum

  mum in the crowd. During their return, the head of exit

  (8) Pull the weft thread completely through the crowd.

  When the output head (8) has reached the outside of the shed, the mechanism (16) causes the opening of the branch of the output head (8) thus releasing the wire

frame.

  FIG. 2 is an exemplary embodiment of a

  this (5) equipped with an input head (6) with the mechanism

  opening of the branch (24). This mechanism is

  staked by a cleat (20) connected to a rod (18) which cuts

  smooth in the guide (26). Head side, the rod is fixed

  a drawer (28) which provides several functions. It ensures

  re another guide of the rod (18) and carries the roller

  (30) which bears on the ramp (32) of the branchet-

  te (24). The entire control mechanism described below is recalled by the spring (34). When the cleat (20) is pulled to the right relative to the lance (5) the roller (30) pushes the ramp (32) of the branch (24) which is articulated about the axis (36) in the head (6) thus causing the opening of the clamping zone (40). When the cleat (20) is released, the roller (30) - 7 - resumes its initial position thanks to the spring (34). The

  branch (24) is returned by the spring (38)

  thus closing the clamping area (40). Sure

  Figure 3 shows the pinch zone in more detail.

  cage. In the type of embodiment described, on the branch-

  te (24), an elastomer strip (38) is glued

  wich between the twig and a steel plate (39).

  Thanks to the flexibility of the elastomer, perfect pinching

  flat is assured between the head (7) and the branchet-

te (24).

  The left lance (7) carrying the output head (8) shown in FIG. 2A, operates in every way equivalent to the input head (5). FIGS. 4a to 4c show the system which controls opening of the branch (24) of the inlet head (6). This system is identical to the left for the command of the opening of the

  branch (25) of the output head (8). When the lan-

  this happens towards the end of its race inside the crowd, the cleat (20) comes into contact against the stop (22) fixed on the frame (1). The spear continues its course

  still a few millimeters causing the move-

  relative to the roller (20) on the ramp (32).

  Slides (41) allow a fine adjustment of the position of the stop (22). When the lance goes back, the whole control mechanism is recalled in

  its initial position thanks to the spring (34). During this

  operation, the entrance head opened after

  the output head has grasped the wire. The inlet head

  so comes to his original position outside the crowd

right, branchette closed.

  Figures 5a 5d explain how the entrance head

  pick up the thread. The opening mechanism (17) of the branch

  chette is represented here by way of example, by an electromagnet (42), which via a lever

  (43) acts on the ramp (44). This ramp (44) is reminiscent

by a spring (45).

  In view 5a, the spear returns to its original position

  the ramp (44) is set back to allow

wise with the roller (46).

  In the view 5b, the head reaches its maximum withdrawal, the electromagnet (42) is excited and the ramp (44) is in

advanced position.

  In the view 'c, the spear starts again for the insertion of a

  new thread. A weft thread (54) is presented by the

  canism (13). The roller (46), while rolling on the ram-

  pe (44), causes the opening of the nipping zone (24) which takes the weft thread. Just before grabbing the wire, we'll have time to blow the pinch area for

clean.

  In view 5d the roller (46) leaves the ramp (44) and the clamping area closes on the weft thread (54) which is thus pulled by the exit head, in the center

of career.

  The electromagnet offers the advantage of having a

  simple, fast and very reliable. An order entirely

  mechanics can also be considered.

  The opening of the exit head works according to

  the same principle. It is described in Figures 6a to 6d.

  An electro-magnet mechanism has also been used here

as an example.

  In view 6a, the output head (8) leaves the - 9 -

  crowd pulling the thread (54). The ramp (49) is in position

  advanced motion under the impulse of the electromagnet (47)

and the lever (48).

  In view 6b, the roller (51) rolls on the ramp (49) causing the opening of the clamping zone (41).

The frame is released.

  In view 6c, the head (8) continues its return ar-

  and the roller (51) leaves the ramp. The pine zone

(41) closes.

  In view 6d, the electromagnet (47) is no longer ex-

  cited, the ramp (49) is biased by the spring (50) leaving the free passage to the roller (51) when the head

  exit returns to fetch a new frame.

  All these controls thus avoid the rollers (46)

and (51) unnecessary shocks.

  Rollers (46) and (32) for the input head and

  (31) and (51) for the output head can be replaced

  by skids made of various friction materials such as carbon fibers, textures, etc. as described in

Figures 7a and 7b.

  For a better understanding, we do not have

  presented that some parts of the twigs (24,25) and

drawers (28,29).

  The different views of FIG. 8 make it possible to better understand the operation of the assembly. In the view, the inlet head is opened by the outer opening system, described above and the wire is presented. At sight 2 the yarn is pinched and can be pulled from the spool. The two spears begin their progression towards the crowd. At sight 3 the heads are vis-a-vis and the output head is in extreme advanced position, already open by the cleat (23) located outside

- 10 -

  a crowd. On the view, we see that the head of

  start his return and thus closed again on the

  thread. The entrance head continues its advance.

  In view I, while continuing its advance, the input head opens with the cleat (22), releasing the weft thread, exchange being thus ensured. The view 6 shows the entrance head which starts his. The branchette can

then close up.

  At sight 7 insertion continues, until the view o the entrance head leaves the crowd, and the head

  output which can then open thanks to the mechanism (16).

  The shutter can then pack the pick. At view 9, the entrance head is open ready to grab a new thread

  and the exit head is closed.

  Throughout the description, the thread has never been

  left free thus ensuring insertion without any risk.

  that of default due to the gripping heads. At no time did a foreign body come through the layers of threads

  chain to ensure the control of the heads. Thus,

  There is no danger in the fabric and the breakages

  warp threads are greatly reduced.

  Figures 9a and 9b show another type of

  the use of the input and output heads to further reduce the number of moving parts. In these figures, the same references as those used in

  the example described above designate the same elements

  ments. In this embodiment, the force of opening

  ture and closure of the twig is done through

  permanent magnets. As is apparent from the figures

  9a and 9b, the magnets, all of which are designated by reference (52), are mounted to look like

- he -

  alternatively a positive pole (55) and a negative pole (53). The same magnet arrangement (52) is realized on the

  drawer (28) that can be moved relative to the branch

  chette (24) (or (25)), thereby providing an attraction or repulsion according to the desired effect. In this embodiment, the drawer (28) is equipped with three magnets

  52 of which two have, for example, the positive pole

  tif (55) apparent and the third having the negative pole

  (53) apparent. On the twig (24) (or (25)), is

  rigorously placed the same mounting permanent magnets vis-à-vis those of the drawer (28). If the magnets mounted on the drawer (28) are arranged opposite those mounted

  on the twig (24) (or (25)) (Figure 9a), there is repetition

  o closing the clamping area (40) (or (41 /.

  If the drawer (28) moves to the right (repre-

  shown in Figure 9b), following the same principle as in the previous embodiment, the poles are found in

  opposition, then there is attraction causing the opening

  the pliers. The spring (34) (or (35)) makes it possible to

  return the drawer (28) (or (29)) to the

  initial and causes the closure of the clamp (Figure 9a).

  The operation of the output clamp is rigorous-

  identical, and for this reason, in Figures 9a and 9b, the references used for this output clamp

have also been mentioned.

  It goes without saying that the type of embodiment presented is only a non-limiting example showing the advantages of the invention with the magnets, as well as the details

  achievements that are described above.

- 12 -

Claims (9)

  1 / Device for inserting the weft thread,   can be used on looms without shuttle, com-   carrying stationary weft stock spools (15) and two lances (5) and (7) oscillating from both sides of the fabric and penetrating substantially the same distance in the crowd , the weft (54) when the lances are advanced around the middle of the crowd being transmitted in the form of single or multiple wire by a head commonly referred to as "input head" (6). climb to the end of   the lance (5), with the corresponding head called common-   "head of exit" (8) of the other lance (7), these heads   having twigs (24) and (25) pinching the.   weft yarn, characterized in that these twigs (24) and (25) are positively actuated by mechanisms located inside the head in order to seize and then to release the weft thread.   2 / Device for inserting the following weft thread   claim 1, characterized in that   canisms consist of a roller '(30) and (31) or a   pusher (55) acting on a portion (32,33) of the branch   chette (24) and (25) in the form of a cam.   3 / Device for inserting the following weft thread   claim 1, characterized in that these mech-   Nisms are constituted by at least one permanent magnet (52) so as to have in appearance alternately a positive pole (55) and a negative pole (53) facing which comes to appear at least one permanent magnet (52) so that to have in appearance alternately   a positive pole (55) and a negative pole (53). - 13 -   4 / Device for inserting the following weft thread   any of claims 1 to 3, characterized   rised in that these mechanisms are actuated by a rod   or a wire (18,19) guided through the lance (5,7).   / Device for inserting the following weft thread   any of claims 1 to 4, characterized   characterized in that said rods or wires (18, 19) have a cleat (20, 21) towards their opposite ends to the clamp (fi, 8), said cleats (20, 21) coming into contact with a stop (22, 23) when the lances are almost fully deployed in the crowd, thereby actuating the tweezers (24, 25) of the input and output heads to enable   the exchange of the frame (54) from one head to the other.   6 / Device for inserting the following weft thread   any of claims 1 to 5, characterized   in that on the side of the loom, outside the shed a mechanism (17) for opening the branch (24) makes it possible to take positively the weft thread (54) which   is presented to the head of entry by a special device cial (13) for feeding the wire.   7 / Device for inserting the following weft thread   any of claims 1 to 6, characterized   rised in that the exchange of the frame (54) of the head   from the inlet (6) to the outlet head (8) is effected   the movement of the spears (5,7), these having a   relative speed of 0 during the duration of the trans- fert.   8 / Device for inserting the following weft thread   any of claims 1 to 7, characterized   risé in that on the side of the loom, outside the crowd, an opening mechanism (16) of the skewer - 14 -   (25) allows the nip (41) to open for   releasing the weft thread (54) from the output head (8).   9 / Device for inserting the following weft thread   any of claims 1 to 8, characterized   rised in that the control of the ramps (44,49) is   thanks to an electromagnet (42,44).   / Device for inserting the following weft thread   any of claims 1 to 9, characterized   in that the rollers (30,31) and (46,51) can be advantageously replaced by pads (55) and (56) in   materials with good wear resistance.   11 / Device for inserting the following weft thread   any of claims 1 to 9, characterized   in that in the nip zone (40,41) the heads (6) and (8) of the twig (24,25) and / or the body (6,8) are   is equipped with an elastomer strip (38) made of   wich under a steel or ceramic plate.   DEPOSITOR: ALSACIAN SOCIETY OF TEXTILE MATERIAL- "SAMT" AGENT: Cabinet Michel LAURENT