FR2460353A1 - SHUTTLE FOR CIRCULAR WEAVING WITH DEVICE FOR SIGNALING A BREAK OF WIRE - Google Patents

Abstract

SHUTTLE FOR CIRCULAR TRADE IN WHICH ONE OF THE CAN FIXING DISCS TURNS A REFLECTING LAYER NORMALLY SUBTRACTED TO THE ACTION OF A PHOTO-ELECTRIC PROBE AND FALLING UNDER THE ACTION OF THE PROBE WHEN BRAKING DUE TO A WIRE BREAK. THE REFLECTING LAYER 23 COVERS ONLY A PART OF THE CIRCUMFERENCE OF A RING 13 MOUNTED ON THE HUB 6 OF THE DISC 3 AND CLAMPED BY A SPRING 16 AGAINST THE DISC 3; THANKS TO A TRACTION SPRING 21 OF APPROPRIATE FORCE, ACTING ON THE RING 13, THE REFLECTING LAYER 23 WHICH IS NORMALLY LOCATED OUTSIDE THE ACTION ZONE OF THE PHOTO-ELECTRIC PROBE IS RETURNED TO THIS ACTION ZONE WHEN THE CAN IS STOPPED AS A RESULT OF A WIRE BREAK. APPLICATION TO CIRCULAR Looms of all kinds.

Description

1 CASE 2

  The present invention relates to a shuttle for

  circular weaving machine comprising a curved pad forming the shuttle body, on whose side opposite the surface

  Sliding devices are provided with consoles

  positioning members, rotatably mounted for receiving the bobbin, elements constituted by a rotating cone which can be pushed back against the force of a spring and engaging in the hub of the bobbin and by a disk provided with a central cone , and also comprising a device adapted to brake the disc in case of wire break, as well as a

  reflective layer which the disc rotates and which,

  the disc is stopped, is detected by a camera probe

electric reflection.

  In the known shuttles of this kind, there is provided a reflective tape glued to a hub-shaped sleeve extending the disc, which encloses said hub in the manner of

  a sleeve. On the end of the hub is mounted a disc. In-

  the two discs that surround the reflective band, lamellae are mounted eccentrically around pegs arranged parallel to the coil axis and, when the

  discs rotate, the centrifugal forces acting on these

  they rotate them from a substantially radially directed position into a position

  substantially tangential to the cylindrical enveloping surface

  described by the support pins, position in which they completely cover the reflective band. When the discs are fully braked and stop rotating, the slats fall back into their position directed in the direction

  the position in which the reflective band is de-

  tected by a reflective photoelectric probe arranged on the frame of the circular loom, which signals the stop of

  the bobbin and, consequently, the broken wire. With the

  known, it may happen that a shuttle continues to operate

  without even noticing it even when the bobbin is stopped, that is to say when there is a breakage of weft thread, because the slats are blocked in

  their spacing position where they cover the reflective strip

  chissante. Such blocking of the lamellae may result, for example, from fouling of the pivot bearings or from jamming, the return forces resulting solely from the low weight of the lamellae in the event of a bobbin stop being

  then too weak to rotate the slats and

  lead in their approximately tangential position.

  It is therefore an object of the invention to create a shuttle with which a stop of the bobbin due to a break

  wire is detected and reported with a high degree of safety.

  This result is obtained by the invention with a shuttle

  of the type indicated at the beginning because the reflection layer

  trice covers only part of the circumference of one

  a wheel mounted rotatably on the hub of the disk and movable in the axial direction, which is clamped by a spring against the disk so that its front face adjacent to the disk bears on the lateral surface of the latter, thanks to the fact that it is a pull spring fixed on one side to the ring and on the other side to the shuttle body whose force is given to the frictional force between the ring and the disc so as to

  that, when the bobbin is stopped, the said spring turns

  the ring which, when the bobbin is spinning, has

  turned at an angle to allow the reflective layer to

  The rearward rotational movement is such that the reflecting layer is then in the area of action of the reflection photoelectric probe. When the disc rotates, which usually is at the same time brake disc braked by a brake shoe in case of wire breakage, 1 '

  ring, driven by the friction force that is transmitted to it

  put by the disc, turns from an angle such that its peri-

  which, when the disc is stopped, is on the path of the rays of the reflective photoelectric probe,

  out of this area of action. If a rup-

  wire and that, therefore, the bobbin is braked, the friction force between the disk and the ring mounted on the disk hub of the shuttle according to the invention decreases so that the tension spring can reduce in size. back the ring by turning it enough so that the reflective layer comes to stand on the path of the spokes of the

  photoelectric reflection probe. The control device

  according to the invention is practically insensitive to

  these exteriors, so that it reliably signals the

wire breaks.

  According to a particularly suitable embodiment, it

  is provided to adjust the clamping pressure of the ring con-

  be the disc a pressure spring mounted between the ring and

  a cap nut screwed end to the hub. The nut with

  skin is provided with a rotation-type rotation of the current type so that it can be locked on the hub after having adjusted

wanted the clamping pressure.

  The end positions of the ring are advantageously

  determined by stops which are on the body of

vette.

  According to another advantageous embodiment of the invention,

  the disk is provided in the area of the frontal surface

  of the ring rubbing on it, a brake lining.

  The features and advantages of the invention

  from the following description,

  for example, with reference to the appended drawing in which:

  FIG. 1 is a longitudinal sectional view of the

  the disk which supports and brakes the bobbin on one side; FIG. 2 is a section taken along the line

II-II of Figure 1.

  The shuttle partially shown in the figures is constituted in a manner known per se by a basic body 1 which carries a stirrup with a wire guide eyelet and a

  rear guide roller, these elements not being representative of

  your. In the front part of the base body 1 is a clamping cone, rotatably mounted and axially movable.

  against the force of a spring, which serves to fix the

  net and is not represented either. The other side of the bobbin is held by cone 2 motionless in the axial direction, against which the winding core of the bobbin is applied and tightened by the cone urged by a spring and which has come

  in one piece with the brake disc 3. The brake disc

  ge 3 comprises on its face opposite the cone 2 a brake lining 4 which is in action connection with a brake shoe

  coming into action in case of wire break. In this, the turnip

  te according to the invention corresponds, for example, to the shuttle

  which has been described in DE-OS 28 46 920.

  The disc 3 provided with the brake lining 4 is mounted on the console 5 of the basic body 1. The disc 3 is provided with a hub 6 in the form of a sleeve which extends it on its side.

  back. In the bore of the hub 6, rolls are introduced

  ball bearings 7, 8, the external path of the ball bearing 8 is fixed against the inner wall of the hub 6 by retaining rings 9, 10. The ball bearings are mounted by their inner bearing rings, which are maintained at a certain distance from one another through the spacer sleeve 11, on the bolt 12 which is screwed

with the console 5.

  The ring 13 is mounted on the outer lateral surface of the hub 6, so as to be rotatable by means of the ball bearing 14 and to move in the axial direction. The outer race of the ball bearing 14 is locked in the bore of the ring 14 by retaining rings. The inner race of the ball bearing 14 can slide on the lateral surface of the hub 6. The ring 13 is

  provided with a flat frontal surface 15 by which it applies

  4 of the disc 3. On the hub 6 is engaged a pressure spring 16 which is mounted between the inner path of the ball bearing 14 and the cap nut 17. A lock washer 18 ensures the blocking in rotation of

the cap nut 17.

  The ring 13 is provided with a peripheral groove 19 in which is fixed on a pin 20 which passes through it, one of the ends of a tension spring 21. The other end of the tension spring 21 is fixed to a bolt 22 connected to the

console 5.

  On the ring 13 is glued a piece of reflective tape

  23. In addition, there is provision for another peg 24

  transversely the peripheral groove 19 of the ring 13 which, as well as the pin 20, cooperates with the pin 25 connected to the base body 1, projecting into the groove 19 and forming a stop. In the position shown in FIG. 2, the ring 13 is in its end position where it has been

  brought by turning under the action of the disk 3 provided with the

  brake 4; in this position, the pin 20 is supported on the abutment 25 and the reflective layer 23 has been released

  of the S-ray path of the photoelectric probe with

  xion. When the disc 3 has to stop, the spring 21 pulls back the ring 13 until the pin 24 comes striking the abutment 25. In this limit position, the reflective layer 23 is placed on the path of the spokes S reflective photoelectric probe, so that this

  last one indicates that there is a break in the wire.

  _9 gr -.T q <_S 1. ravet-, Four mtinr 8 circus issuer with a forin rccurbé forrsnt I corns shuttle, on the frame which ooposé on the sliding surface are drevues consoles q with e1rInerts positioning mounted to turn to receive the bobbin, which are constituted by a rotary cone Dou7-ent be pushed back against the force of a spring and coming to roach the no-ai, can, and oar a disc nuni a central cone, and also comprising a device adapted to brake the disc in case of wire breakage and a reflective layer that the disc rotates and which,

  when the disc is stopped, is detected by a digital probe

  all the reflection, characterized in that the layer

  (23) covers only part of the periphery

  a ring (13) on the hub of the disc (3) so as to

  see rotate and move in the axial direction, which is clamped by a spring (16), against the disc (3), so aue its front face (1i) adjacent the disc (3) is supported on the side face of the latter, and in that a tension spring (21) fixed on one side to the ring (13) and on the other side to the shuttle body (1), the spring of which force is given to the friction force between the ring (13) and the disc (3) so cue, when the bobbin is stopped, said spring rotates back to the ring 2 which, when the bobbin rotates, itself turned at an angle Dermettant fe make the reflective layer (23) out of the area of action of the reflection photo-electric light,

  this backward rotation movement being such that the

  c}: Reflective is in the action area of the pallor

phloto-electric reflective.

  2. Mop according to claim 1, characterized in that aue our adjust the clamping pressure of the ring (13) against the disk (:), -l is provided a pressure spring (16) mounted between the ring (13). ) and a ring nut screwed on the end

MOMTeU (6).

  7. T he-head according to claim 1 or 2, characterized in that the end rosaries of the ring are determined r.nr abutments (20,24, 2r) which are on the ring (13) and on the shuttle cerns. (1)

  4. "avette according to any one of claims 1 to 3,

  ara..teris in that the disnue U3) is provided with a garnish

  brake (4) in the area of the front surface (15) of the

water (1!) yes rubs on him.