FR2679930A1 - WICK STOP DEVICE IN THE EVENT OF BREAKING THREAD ON A DRAWING BENCH OF A SPINNING MACHINE. - Google Patents

Abstract

Device for stopping the arrival of the wick in the event of a thread breakage on a drawing bench of a spinning machine, comprising in particular: an electromagnet controlled by a thread breakage or thread breaker detector, a feed roller upper (6) which is lifted during a wire break, and a pivoting stop member (36) which immobilizes the wick (14) by tightening it and which is raised and releases the transport of the wick when the roll d the upper feed (6) is lowered. Various mechanical means (rack loaded by spring and provided with a groove in which the movable armature of the magnet engages, toothed wheel, cam, springs, rod) cooperate to bring the pivoting member (36) to block the bit (14) by clamping it on a table (7) before the lower feed roller (5).

Description

WICK STOP DEVICE IN THE EVENT OF WIRE BREAKAGE

  ON A DRAWING BENCH OF A SPINNING MACHINE

  The present invention relates to a device for stopping the arrival of a wick (of preparation) in the event of wire breakage on a drawing bench of a spinning machine, comprising: an electromagnet controlled by a wire breakage or breakage detector -wire, an upper feed roller which, when a wire breaks, is raised by means of an oscillating arm, and a pivoting stop member which immobilizes the wick by tightening it on a table and which is raised when the upper feed roller is lowered onto the roller

  lower feed, and frees the transport of the wick.

  By German patent DRP 29 23 26, a stop device is already known for interrupting the arrival of the wick in the event of a wire break on a drawing bench of a spinning machine, device in which a break detector wire or wire breaker controls an electromagnet, which has the effect that the upper feed roller is detached from the lower roller by means of a swinging arm A pivoting stop member then immobilizes the wick at the same time by tightening it , after a wire break signal The retractable feed roller is kinematically linked to the pivoting stop member so that when the feed roller comes off, the pivoting stop member stops the wick and the

  releases again when lowering the feed roller.

  This stop device has the disadvantage of an unstable fixing and insufficient blocking of the wick as well as an unreliable stop of the wick by the pivoting stop member, in particular when it is hardly stretchable fibrous material The elements of the stop device are unsuitable for use

with modern drawing benches.

  Currently, the drawing benches are usually of the type with two straps, as known for example from German patent DE 22 57 961 C 3 The input element with the upper feed roller and its positioning and loading elements is fixed on a support arm This upper feed roller is combined with a lower feed roller which is mounted in the frame of the spinning machine and which extends over several spinning stations The pairs of straps and rollers output are mounted analogously to this pair of feed rollers This drawing bench does not include a device for stopping the wick The upper feed roller common to two neighboring spinning stations is disadvantageous

due to mutual influence.

  The object of the invention is to eliminate these drawbacks and to provide a space-saving, economically advantageous stop device capable of equipping existing equipment. It will have to operate automatically, very reliably, with any wick or fibrous material. and prevent any passage of fiber This stopping device must also be suitable for walking

automated.

  According to the invention, in the case of a device for stopping the arrival of a wick (for preparation) in the event of wire breakage on a drawing bench of a spinning machine, comprising: an electromagnet controlled by a detector wire break or wire breaker, an upper feed roller which, during a wire break, is raised by means of an oscillating arm, and a pivoting stop member which immobilizes the wick by tightening it on a table and which is raised when the upper feed roller is lowered on the lower feed roller and frees the transport of the wick, this object is achieved according to the invention by the fact that there is provided a rack stressed by spring, provided with an engagement groove in which the electromagnet engages by its spring loaded frame, when the drawing bench is in the operating position, and from which it emerges in the stopped position, in order to release the rack for movement nt positioning; by the fact that a toothed wheel meshing in the rack is arranged on a cam which is linked, with the possibility of movement, by means of a bearing, to the free end of a large set of springs, so transforming the linear movement of the rack into a pivoting movement of the cam, and thus bringing the large set of springs from its position close to neutral in the stop position of the stop device; by the fact that the pivoting stop member is linked by articulation, by means of a link, to the cam while being constrained to follow a curve and can be brought by pivoting to its stop position, under the 'effect of the torque of the large set of springs acting on the cam, to block the wick on the table before the upper feed roller; by the fact that after an angle of rotation at no load, the cam is in engagement with the swinging arm, which swinging arm accompanied by the upper feed roller can be moved by pivoting, against the pressure exerted on it by a small assembly of springs, under the effect of the opposing torque of the large set of springs, until the upper supply roller is detached from the lower supply roller and at the same time the pivoting stop member strikes the table and stop the wick; by the fact that there is provided a lever briefly attacking the cam rotation bearing, for the back pivoting of the cam and consequently of the large set of springs, from the stop position to its position close to neutral; by the fact that the oscillating arm can be disengaged from the back-pivoted cam, so that the upper feed roller held in this arm descends on the lower feed roller, under the effect of the pressure of the small set of springs; and by the fact that the back-pivoted cam can bring the rack to its initial position in which the armature

  spring loaded snaps into the rack.

  In one possible embodiment, the invention provides that the lifting feed roller is integrated, with its holding elements in the stop device, that it is fixed, with the possibility of translation and replacement, in an arm -support carrying upper rollers of the drawing bench, and that this roller

  can be replaced when the drawing bench is open.

  In other words, this stop device, with the upper feed roller and its loading and positioning elements, is grouped in a module or unit and is fixed on a support arm for upper rollers of the drawing device, with Possibility of

  translation and replacement, at the entrance of the stretching device.

  When a wire break signal occurs, an electromagnet moves the stop device from its operating position to its stop position in which the wick is stopped before the feed rollers. upper feed roller is coupled to the stop, so that the wick is not separated until after the feed rollers and does not have to be reintroduced between the feed rollers when resuming spinning L The invention therefore also has the advantage that the spinning station can be quickly put back into operation after a wire break, this also because the passage of the stop device from its position

  stop at its operating position is simple.

  The operating reliability of the stop device is ensured by the electromagnetic control and by the tilting of the pivoting stop member towards the stop position The pressure of the pivoting stop member on the drill bit to be stopped is produced by means of a set of springs The control of the stop elements is also carried out in a substantially safer manner than in the known stop device operating under the force of a weight. Raising the support arm with the upper rollers stay without

  influence on the stop device fixed on the support arm.

  In a development of the invention, provision is made to arrange, following the upper feed roller, a retaining member which, depending on the position of the stop device, is either raised by means of a torsion spring fixed on said retaining member, or lowered towards the lower feed roller in order to lock against the table the torn-off end of the wick, the pressing pressure of the retaining member being lower than that of the 'stop member, and there is provided, on the swing arm, a nose with which the torsion spring can be tilted to the stop position or to the on position This additional retaining member, with its stop on a second table after the feed rollers, guarantees that the torn wick will be kept in the drawing bench, even if it is cotton or other fibrous materials with short fibers, so that no threading in the next pair of rollers will only

  necessary for resetting.

  In one development, the invention provides that two stop devices for two neighboring spinning stations, each device having its own upper feed roller, are grouped in a common unit on a double support arm, and that the two devices stop are assembled to the support arm being mutually symmetrical with respect to a plane; and that, in this common unit, the respective electromagnets are

  possibly arranged one after the other in the arm-

  double support Thus, the advantages of the stop device can

  can also be obtained with a bilateral, double support arm.

  The invention also provides that the two liftable upper feed rollers can be raised and replaced independently of one another. This avoids influencing the

neighboring spinning stations.

  In one possible embodiment, the invention provides that, when the drawing bench is open, the member for holding the upper feed roller in the swinging arm can be released by a spring loaded locking system. , said locking system engaging in a groove of the axis of the feed roller and being released from this axis by a movement of the lever

  tilting the bent leg of the locking system.

  Thus, the replacement of the upper feed roller on each side of the support arm is possible by moving the lever on this

support arm.

  In one embodiment, the invention provides that the lever is loaded by spring and can be moved manually, on both sides, to two positions: forward towards the operator, for recall, when the drawing bench is closed, or towards the rear towards the middle of the machine, towards the position for unlocking the upper feed roller,

  and that the lever is automatically returned to its rest position.

  The path followed by the control line or cable that can be mounted on pre-existing equipment, to go to the stop device, is such that this control line or cable going to the

  electromagnets pass through the upright and into the support arm.

  The various advantages and characteristics of the invention

  will appear more fully in the following description,

  presented by way of nonlimiting example with reference to the accompanying drawings, the figures of which represent: FIG. 1, a side elevation view of a drawing bench with stop device in the operating position; Figure 2, a section along A-A of Figure 1, passing through the stop device in the operating position; Figure 3, a side elevational view of the open drawing bench; Figure 4, a longitudinal section along B-B of Figure 2, passing through the stop device in the operating position; Figure 5, a longitudinal section along C- C of Figure 2, passing through the stop device in the operating position; Figure 6, a section along C-C of Figure 2, passing through the stop device in the stop position; Figure 7, a section along D-D of Figure 2, passing through the stop device in the stop position; and FIG. 8, a section on D-D of the stop device in

operating position.

  Figure 1 shows, in its operating position, a drawing bench of a continuous ring loom not shown The cylinders 1, 3, 5 of the upper rollers and two fixed tables 7, 8 located on both sides of the roller d lower feed 5 extend over several spinning stations, possibly on one whole side of the loom The upper rollers 2, 4, 6 are held in the support arm 9 The support arm 9 is fixed with the possibility of pivoting, to the loom continuous ring, by means of an upright 10 on a support bar 11 The driven lower cylinders or rollers 1, 3, 5 and the combined upper rollers 2, 4, 6 form the three pairs of known rollers of the drawing bench : the pair of output rollers 1 and 2, the pair of strip rollers 3 and 4 and the pair of feed rollers 5 and 6 Instead of the known input element with the upper feed roller, the new stop device with integrated feed roller 6 and elem positioning and stressing ents is fixed on the support arm 9 with the possibility of displacement and replacement A device

  stop is assigned to each spinning station.

  In combination with the positioning and biasing elements relating to the detachable upper feed roller 6, the stop device forms a unit ("module"), which can be quickly mounted and fixed on the support arm 9 A cover 12 provided with recesses surrounds the stop device The mount for the upper feed roller 6, for receiving different rollers

  inlet 6, is arranged in the stop device.

  In the operating position shown, the upper feed roller 6, removable, presses on the lower feed roller 5 the wick (of preparation) previously compressed in the compressor 13 upstream of the feed rollers 5 and 6 The wick 14 is brought into the drawing bench under the effect of the rotation of the feed rollers 5 and 6 Via a sensor not shown, a wire break generates a wire break signal which passes the stop device from the operating position to the stop position shown in FIGS. 6 and 7 A lever 15 which can be moved manually forwards serves to return the stop device to the operating position, the lever 15 returning automatically at its position of

operation shown.

  Figure 2 shows a section along AA of the stop device shown in the operating position in Figure 1 The combination of two stop devices on a support arm 9 is recognizable in this cross section The two stop devices for two neighboring spinning stations are arranged symmetrically on a bilateral, double support arm, 9 constituting a unit In this unit, only the two electromagnets 16 and their paddles 17 are not next to each other but are arranged, in order to save space, one behind the other in the U-shaped support arm In the cross section shown, among the electromagnets 16 and their armatures 17, only the one at the front is visible This unit is mounted , with its common enclosure in three parts 18, in the support arm 9 and is fixed by means of a fixing screw 19, with the possibility of displacement The two upper feed rollers 6 held in this unit are individually maintained in swing arms 20 which can be operated separately and can also be replaced independently of each other A small set of springs 21 pivotally mounted urges each swing arm 20 with upper feed roller 6 After a wire break, a cam 22 visible in FIGS. 5 and 6 presses the swinging arm 20 with upper feed roller 6 against the pressure of the small set of springs 21, pushing upwards The cam 22 is back-pivoted with the lever 15, so that the upper feed roller 6 is again lowered to the operating position shown For this, the lever 15 is briefly pulled forward

towards the operator.

  In FIG. 3, the open stretching bench is shown. The stop device remains in its operating position in the support arm 9 raised by means of the raised positioner lever 23, while the wick 14 is not raised. but applies to the lower roller rolls 1, 3, 5 and the two tables 7 and 8 The upper feed roller 6, replaceable only when the drawing bench is open, is unlocked when the lever 15 is moved in the guide of a cover 24 in the direction of the arrow (in the position shown in broken lines), by the pushing of the lever 15 on a pivoting lock 25 As the lever 15 returns to its rest position under the effect of antagonistic pressure of the stop member 25 loaded by spring, it follows that the locking of the feed roller 6 operates automatically. The control line or cable 41 which can be mounted in addition is passed through the support member or upright 10 and through the support arm 9 to go to the visible electromagnets 16

in figure 4.

  In Figure 4, we can see the two electromagnets 16 of the unit or module, located one behind the other, and their movable armatures 17 loaded by spring A stop pawl 26 is fixed with

  possibility of movement on the frame 17 loaded by spring.

  In the operating position of the stop device, the frame 17 pushes the pawl 26 in a latching groove 27 of a rack 28 biased by spring, which serves as a positioning means In this rack 28 meshes a toothed wheel 29 of the cam 22 visible in FIGS. 5 and 6, toothed wheel by means of which the linear movement of the rack 28 loaded by spring can be transformed into a pivoting movement of the cam 22, and vice versa Arranged after the feed roller upper 6, a pivoting stop member 30, raised in the operating position, is supported, in the stop position, on the table 8 fixed below it and on the torn off end of the

wick 14 (Figure 6).

  In FIG. 5, the stop device is shown in the operating position, in the form of a CC section parallel to the section in FIG. 4 The wick 14 is brought into the drawing bench by the roller. lower feed 5 and by the upper feed roller 6 shown in phantom, and passes over the two tables 7 and 8 The upper feed roller 6 is held in the swing arm 20 which is pushed down by the small assembly springs 21 The axis 31 of the individually replaceable upper feed roller 6 has a groove 32 in which engages the locking member or system 25 loaded by spring, so that this axis 31 is locked by means of the lever 15, insofar as the support arm 9 is raised, the second bent branch of the locking system 25 can be angularly displaced against the force of a torsion spring 33, backwards towards the middle of the loom, a point such as the locking of the feed roller 6 is eliminated In the operating position of the stop device, a large set of springs 34 is practically in its neutral position The cam 22 secured in movement to the large set of springs 34 maintains this last in the operating position but, after a wire break, this set of springs 34 pivots in the direction of the arrow An elastic stop 35 prevents the large set of springs 34 from going beyond its neutral position and remaining immobilized on the side opposite the arrow This elastic stop 35 automatically returns the large set of springs 34 to its approximate neutral position In the operating position of the stop device, the large set of springs 34 is compressed due to the position of cam 22, and the torque on cam 22 is negligible due to the neutral position

  approximate of the spring assembly 34.

  Figure 7 shows the same section C-C of the stop device

  as in FIG. 5, the latter however being in its stopped position.

  In this stopped position, a wire break signal controls the electromagnet 16 visible in FIG. 4, which has the effect of immediately pivoting the cam 22 on which the free end of the large set of springs 34 is articulated. The large set of springs 34 is thus moved by pivoting, out of its approximate neutral position and generates an increasing torque on the cam 22 After an angle of rotation of the order of 45 degrees and with an increasing torque, the cam 22 arrives on the other side, against the swing arm 20 with the upper feed roller 6 The torque of the large set of springs 34 is greater than the opposing torque coming from the small set of springs 21, which has the effect that the swing arm 20 with the upper feed roller 6 comes off from the lower feed roller 5 This results in an interruption in traction between the upper feed roller and the lower feed roller In accordance with the rep resentation in section according to FIG. 7, parallel to FIG. 6, there is at the same time a lowering of a pivoting stop member 36, this by means of a link 37 which is fixed to it, link in which s engages a finger 38 of the cam 22 The pivoting member 36 will therefore follow the constraining curve of the cam 22, under the effect of the torque coming from the large set of springs 34, until the wick 14 is clamped by clamping on the table 7, in front of the lower feed roller 5 In order to facilitate smooth re-spinning when spinning short fibers, the stop device comprises the retaining member 30 after the lower feed roller At the same time time, the pivoting stop member 36 and the retaining member 30 are supported on the tables 7, 8, on both sides of the lower feed roller 5 A second torsion spring 39

  (Figure 6) is used for the movement of the retaining member 30 which it attacks.

  The free end of this spring is moved by a nose on the swing arm 20, so that the retaining member 30 receives, under the effect of the rise of the swing arm 20, a forced downward movement, and vice versa L the retaining member 30 keeps the tip of the drill bit torn off 14 on the table 8, after the lower feed roller 5 The torsion spring 39 pushes the retaining member

retainer 30 on wick 14.

  Figure 8 shows the DD section shown in the operating position of the stop device in Figure 7 This cutting plane is located far outside, so that the elements inside the stop device are not visible only in side elevation The lever 15 is shown in its rest position and, in phantom, in a position in which it is briefly pulled forward, towards the operating personnel, to bring the

  stop device at the operating position shown.

  In the position drawn in phantom, the lever 15 exerts, by means of the link 37, a thrust against the stop member 36 which, therefore, takes the operating position shown The other elements hidden by the lever 15 and by the retaining member 36 maintain the stop device in its operating position, even after the automatic return of the lever 15 under the effect of a spring 40 The maintenance of the elements after the brief pivoting of the lever 15, to return to the operating position, is also detectable in Figures 4 and 5 The finger 38 on the cam 22 moved by the displaced link 37 rotates the cam 22 until its toothed wheel 29 meshing in the rack 28 brings this last in its initial position In this, a pawl 26 engages in the engagement groove 27 of the rack 28 The pawl 26 maintains the elements in the operating position, until this ratchet 26 is again released from groove 27 after a new

wire break signal.

Claims (8)

  1 Device for stopping the arrival of a wick (of preparation) in the event of a wire break on a drawing bench of a spinning loom, comprising: an electromagnet controlled by a wire break detector or wire breaker, a upper feed roller which, when the wire breaks, is raised by means of an oscillating arm, and a pivoting stop member (36) which immobilizes the wick (14) by tightening it on a table and which is raised when the upper feed roller (6) is lowered on the lower feed roller, and releases the transport of the wick, characterized in that there is provided a rack (28) biased by spring, provided with 'an interlocking groove (27) in which the electromagnet (16) engages by its spring loaded frame (17), when the drawing bench is in the operating position, and from which it is released, in the stopped position, in order to release the rack (28) for a movement of po location; by the fact that a toothed wheel (29) meshing in the rack (28) is arranged on a cam (22) which is linked, with the possibility of movement, by means of a bearing, to the free end d '' a large set of springs (34), so as to transform the linear movement of the rack (28) into a pivoting movement of the cam (22) and thus bring the large set of springs (34) from its position near neutral in the stop position of the stop device; by the fact that the pivoting stop member (36) is linked by articulation, by means of a link (37), to the cam (22) by being forced to follow a curve and can be brought by pivoting in its stopped position, under the effect of the torque of the large set of springs (34) acting on the cam (22), to lock the wick on the table (7) before the lower feed roller (5); by the fact that after an angle of rotation at no load, the cam (22) is engaged with the swing arm (20), which swing arm (20) accompanied by the upper feed roller (6) can be moved by pivoting, against the pressure against the pressure exerted on it by a small set of springs (21), under the effect of the opposing torque of the large set of springs (34), until the upper feed roller (6 ) is detached from the lower feed roller (5) and at the same time the pivoting stop member (36) strikes the table (7) and stops the wick there; by the fact that there is provided a lever (15) briefly attacking the cam rotation bearing (22), for the back pivoting of the cam (22) and consequently of the large set of springs (34), from the position stop at its position close to neutral; by the fact that the swing arm (20) can be disengaged from the back-pivoted cam (22), so that the upper feed roller (6) held in this arm descends on the lower feed roller (5), under the effect of the pressure of the small set of springs (21); by the fact that the back-pivoted cam (22) can bring the rack (28) to its initial position in which the frame (17)   spring-loaded engages in the rack (28).   2 Device according to claim 1, characterized in that the liftable supply roller (6) is integrated, with its holding elements, in the stop device, by the fact that it is fixed,   with possibility of translation and replacement, in an arm-   support (9) carrying upper rollers (2, 4) of the drawing bench, and by the fact that this supply roller (6) can be replaced   when the drawing bench is open.   3 Device according to claim 1 or 2, characterized by the arrangement, following the upper feed roller (6), of a retaining member (30) which, depending on the position of the stop device, is either raised by means of a torsion spring (39) fixed on said retaining member, or lowered towards the lower feed roller (5) in order to lock against the table (8) the torn off end of the wick ( 14), the bearing pressure of the retaining member (30) being lower than that of the stop member (36), and by the fact that it is provided, on the oscillating arm (20) , a nose with which the torsion spring (39) can be tilted to the stop position or to the walking position.   4 Device according to claim 1 or 2, characterized in that two stop devices for two neighboring spinning stations, each device having its own upper feed roller (6), are grouped in a common unit on an arm- double support (9), and by the fact that the two stop devices are assembled to the support arm (9) being mutually symmetrical with respect to a map.   Device according to claim 4, characterized in that, in this common unit, the respective electromagnets (16)   are arranged one after the other in the double support arm.   6 Device according to claim 4 or 5, characterized in that the two liftable upper feed rollers (6)   can be lifted and replaced independently of each other.   7 Device according to claim 1 or 2, characterized in that, when the drawing bench is open, the holding member of the upper feed roller (6) in the swing arm (20) can be released by a locking system (25) loaded by spring, said locking system (25) engaging in a groove (32) of the axis (31) of the feed roller (6) and being released from this axis (31) by a movement of the lever (15) causing the branch to tilt   angled locking system (25).   8 Device according to any one of claims 1 to 7,   characterized by the fact that the lever (15) is spring loaded and can be moved manually, on both sides, to two positions: forwards towards the operator, for recall, when the drawing bench is closed, or towards the rear towards the middle of the machine, towards the position for unlocking the upper feed roller (6), and by the fact that the lever (15) is automatically returned to its rest position.   9 Device according to any one of claims 1 to 8,   characterized by the fact that the control cable or line going to the   electromagnets (16) pass in the upright (10) and in the arm- support (9).