EP0717134A2 - Speed reducer for yarn forming group in a machine for chenille yarn - Google Patents

Abstract

The speed reduction system, for the machine component groups in a machine for the prodn. of chenille yarns, has an initial shaft (2) with three cylindrical toothed wheels (R2, R3, R8). One wheel (R2) is powered by a drive wheel on the motor shaft. A second shaft (6) has two toothed cylindrical wheels and a tapered pinion (R6). One of its wheels meshes with the first wheel (R2), and the pinion acts with a crown on a shaft at right angles to the second shaft (6). A third shaft (45), parallel to the other shafts (2, 6), has a toothed cylindrical wheel (R9) meshing with the third wheel (R8) of the first shaft (2). A fourth shaft (50) has a tapered pinion (R10), with a joint (49) connection to the third shaft (45). The tapered pinion (R10) acts with a conical wheel to transmit the movement of the rotary cutting blade (L). A fifth shaft has a toothed cylindrical wheel driven by the second wheel (R3) of the first shaft (2) and, in turn, driving a wheel on a shaft. A sixth shaft has a toothed cylindrical wheel, driven by a wheel of the second shaft (6) to drive a wheel of a corresponding shaft. The wheels (R2) of one set are identical, and the wheels (R6) of another set are of the same module and have the same number of teeth. The shafts of the wheels working with the fifth shafts engage the drive wheels for the binding threads and the coils of the effect threads. The shaft for the crown gives movement to the drawing wheels to feed the binding threads, so that the rotations of the drawing wheels match the rotations of the thread guide wheels. The first two shafts (2, 6) are held in a shell structure (CF) in two sealed units (17, 18) fixed to the body (19) of the machine. The shafts are held in corresponding housings, each of two units pivoting round the first and second shaft (2, 6) on a fixed housing (CF), so that the shaft wheels can turn between a working position in contact with the wheels of the thread pitch gauge, and an inoperative setting for access to the gauge with the wheels rotating.

Description

The present invention relates to a speed reducer with one input and several outputs for controlling the wire formation group in a machine for chenille wire.

It is known that a chenille yarn consists of two tying yarns which are appropriately twisted to engage the ends of an effect yarn. For this purpose, the machines for caterpillars comprise at least one group for forming the wire, with a "gauge" on which is wound and sized the effect wire, a blade for cutting the ends of the effect wire thus wound on the caliber, two drive rollers with the corresponding counter-rollers, located on the opposite side with respect to the caliber, to drive the tying threads with the ends of the effect thread and means for recovering and twisting the tying threads with the ends of effect wire interposed. A pair of rollers, or "stretching group", makes it possible to control the unwinding, that is to say the feeding, of the binding threads.

There is also known, for the transmission of movement to the wire formation group in the machines for chenille wire known to date, a transmission comprising a speed reducer with oil bath screw, which is interposed between a main drive member and the organs of said group to be driven, and has several outputs with corresponding cardan shafts.

However, these known reducers have certain significant drawbacks, including excessive power consumption, frequent oil leaks, a high noise level and insufficient safety for the operators responsible for operating the machine. All these drawbacks make these mechanisms unsuitable for current production requirements.

The main object of the present invention is to eliminate the aforementioned drawbacks.

This result has been achieved, in accordance with the invention, by adopting the idea of producing a reducer having the characteristics described in the characterizing part of claim 1. Other characteristics are the subject of the dependent claims.

The advantages obtained thanks to the present invention essentially consist in the fact that it is possible to drastically reduce the power dissipated by the transmission and, consequently, the corresponding mechanical efficiency turns out to be considerably increased compared to that of bath reducers. traditional oil; in that it is possible to achieve a high operational precision for the connection between the reducer and the organs of the wire formation group slaved thereto, which makes it possible to obtain a very high quality chenille yarn and increase the overall reliability of the machine and extend its operational life; in that a reduction gear according to the invention does not have exposed parts and offers a high degree of protection against accidents; in that it has reduced dimensions and very quiet operation.

• un premier arbre (2) sur lequel sont calées trois roues dentées cylindriques (R2, R3, R8): ladite roue (R2) étant entraînée par une roue motrice (R1) calée sur l'arbre d'un organe moteur (M);
• un deuxième arbre (6) sur lequel sont calées deux roues dentées cylindriques (R2', R3') et un pignon conique (R6): ladite roue (R2') s'engrenant avec la roue précitée (R2) et ledit pignon (R6) étant menant par rapport à une couronne dentée (R7) montée sur un arbre (37) perpendiculaire à l'arbre (6);
• un troisième arbre (45) parallèle aux arbres précités (2) et (6), sur lequel est calée une roue dentée cylindrique (R9) qui s'engrène avec la roue précitée (R8) de l'arbre (2);
• un quatrième arbre (50) sur lequel est calé un pignon conique (R10) et relié audit arbre (45) au moyen d'un joint (49): ledit pignon conique (R10) s'engrenant avec une roue conique (R11) dont l'arbre est destiné à transmettre le mouvement de rotation de la lame (L);
• un cinquième arbre (22) sur lequel est calée une roue dentée cylindrique (R5) entraînée par la roue (R3) de l'arbre (2) et entraînant à son tour une roue (R4) montée sur un arbre (24);
• un sixième arbre (22) sur lequel est calée une roue dentée cylindrique (R5') qui est entraînée par une roue (R3') de l'arbre (6) et entraîne à son tour une roue (R4') calée sur un arbre correspondant: lesdites roues (R2, R2'), (R5, R5') et (R4, R4') étant respectivement identiques les unes aux autres.

Sur les arbres desdites roues (R4) et (R4') sont calées les deux roues (31) d'entraînement des fils de liage (FL).
L'arbre (37) de la couronne (R7) précitée est destiné à transmettre le mouvement aux rouleaux du groupe d'étirage pour l'alimentation des fils de liage (FL).These advantages and characteristics of the present invention as well as others will be more and better understood by each person skilled in the art in the light of the description which follows and with the aid of the appended drawings given by way of practical example of the invention, but not to be considered in the limiting sense; drawings in which: - FIG. 1 schematically represents the front view of a reducer for a wire formation group in a machine for a chenille wire according to the invention, on which the primitive diameters of the gears with which the device is equipped are visible; - Fig. 2 shows the sectional view along line AA of FIG. 1; - Fig. 3 shows the sectional view along line BB of FIG. 1, on a reduced scale; - Fig. 4 schematically represents the front view of a machine for chenille yarn equipped with a yarn forming group according to the invention, on which the rollers of the drawing group are visible and on which the machine shown produces two chenille yarn lines. Reduced to its essential structure and with reference to the figures of the accompanying drawings, a speed reducer for the control of a yarn forming group in a machine for chenille yarn, in which said yarn forming group comprises a gauge (32) with motor (320) for winding and sizing the effect wire, a blade (L) for cutting into sections the effect wire (FE) thus wound on the gauge and two wire guide wheels (31) with the corresponding idler counter-wheels (310) mounted on the opposite side to the wheels (31) relative to the gauge (32) for driving the binding threads (FL) and the ends of the effect thread and with a drawing group composed of several rollers (200) for feeding the binding yarns (FL), and with means for recovering and twisting the binding yarns (FL) with the ends of the effect yarn (FE) interposed, comprises according to to the invention:

• a first shaft (2) on which are wedged three cylindrical toothed wheels (R2, R3, R8): said wheel (R2) being driven by a driving wheel (R1) wedged on the shaft of a drive member (M);
• a second shaft (6) on which are wedged two cylindrical toothed wheels (R2 ', R3') and a bevel gear (R6): said wheel (R2 ') meshing with the aforementioned wheel (R2) and said pinion (R6 ) being leading relative to a ring gear (R7) mounted on a shaft (37) perpendicular to the shaft (6);
• a third tree (45) parallel to the trees aforementioned (2) and (6), on which is fixed a cylindrical toothed wheel (R9) which meshes with the aforementioned wheel (R8) of the shaft (2);
• a fourth shaft (50) on which is fixed a bevel gear (R10) and connected to said shaft (45) by means of a seal (49): said bevel gear (R10) meshing with a bevel wheel (R11) of which the shaft is intended to transmit the rotational movement of the blade (L);
• a fifth shaft (22) on which is fixed a cylindrical toothed wheel (R5) driven by the wheel (R3) of the shaft (2) and in turn driving a wheel (R4) mounted on a shaft (24);
• a sixth shaft (22) on which is wedged a cylindrical toothed wheel (R5 ') which is driven by a wheel (R3') of the shaft (6) and in turn drives a wheel (R4 ') wedged on a shaft corresponding: said wheels (R2, R2 '), (R5, R5') and (R4, R4 ') being respectively identical to each other.

On the shafts of said wheels (R4) and (R4 ') are wedged the two wheels (31) for driving the binding wires (FL).
The shaft (37) of the aforementioned crown (R7) is intended to transmit the movement to the rollers of the drawing group for feeding the binding threads (FL).

Furthermore, in accordance with the invention, said shafts (2) and (6) are supported by a shell structure (CF) in two elements (17, 18), fixed to the chassis (19) of the machine. Wheel shafts (R5, R4) and respectively (R5 ', R4') are supported by corresponding housings (CM), each of which is produced in two elements (26, 27) and mounted pivoting around the shaft (2), and respectively (6), on said fixed casing (CF), so that the shafts of said wheels (R5, R4) and (R5 ', R4') can rotate rigidly around the shafts (2, 6) of said wheels (R2, R2 ' ) between two limit positions, one of working, that is to say of contact of the wheels (31) with the gauge (32) and indicated in a continuous line in FIG. 1, and the other out of service to allow access to the gauge (32) with the wheels (31) in rotation and indicated in broken lines in FIG. 1. Practically, each casing (CM) is articulated on the casing (CF). Said wheels (R6) and (R7) have the same module and the same number of teeth, so that the speed of rotation of the rollers of the drawing group is equal to that of the wheels (31).

The device described above therefore makes it possible to produce the following lines for transmitting the movement:
R1 -> R2 -> R3 -> R5 -> R4
R2 '->R3'-> R5 '->R4' for the wheels (31);
R2 '-> R6 -> R7 for the drawing group; and
R2 -> R8 -> R9 -> R10 -> R11 for the blade (L).

According to a preferred embodiment, said wheel (R1) is connected to the shaft (1) corresponding by means of a tongue (7):
said shaft (1) being supported by bearings (5) housed in said fixed casing (CF).
Said wheels (R2) and (R8) are fixed to the respective shaft (2) by means of a common tongue (8): said shaft (2) being supported by two radial bearings (3), one of which is housed in a corresponding fixed ring (12) located opposite the shaft (2) and the other is housed in a base (11) of the fixed casing (CF). Said wheel (R3) is connected to the shaft (2) by means of a corresponding tongue (9). Said wheel (R2 ') is connected to the respective shaft (6) by means of a corresponding tongue (14) and held in place by means of a spacer (13): said shaft (6) being supported by bearings corresponding radials (15), one of which is housed in a corresponding fixed ring (12) located opposite the shaft (6). Said fixed casing (CF) is centered on said rings (12), which are, in turn, centered on corresponding arms (21) fixed to the chassis of the machine. Each of said wheels (R5, R5 ') is held in place by a corresponding pad (23) mounted on the respective shaft (22). Each wheel (R4, R4 ') is fixed to the respective shaft (24) by means of a corresponding tongue (30). Said wheel (R6) is connected to the corresponding shaft (6) by means of a tongue (16) and held in place by means of the stop action produced by a bearing (4) acting on a base (34) which is housed inside a corresponding housing (41), the base (34) being provided with a seal (35). Said wheel (R7) is connected to the corresponding shaft (37) by means of a tongue (36), the shaft (37) being supported by a pair of juxtaposed oblique bearings (38), housed in a corresponding seat provided in the aforementioned casing (41). A ring (39) provided with seals (40) on both sides is mounted coaxially with the shaft (37) in a position located above the bearings (38).

Advantageously, in accordance with the invention, each of said shafts (24) is hollow, that is to say provided with a longitudinal hole for housing another shaft (29) with connecting tongue (28), which is provided with an adjustment member (33) for adjusting its axial position and is coaxial with the upper part of an "L" arm supporting a corresponding wheel (31).

Advantageously, in accordance with the invention, said wheel (R9) is mounted by means of a tongue (46) on the corresponding shaft (45): said shaft (45) being supported by two bearings (47, 48), the l 'one (47), fixed, is housed in a corresponding seat formed in the element (17) of said first housing and the other (48), oscillating radially, is housed in a corresponding groove in the chassis (19).

Advantageously, in accordance with the invention, to allow a more elastic and silent transmission of the movement, said wheels (R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R2 ', R3', R4 'and R5') are made of composite material consisting of several superimposed layers of parallel cotton or similar fibers, which are arranged so that the fibers of each layer form an angle of about 45 ° relative to that of the adjoining layers and treated with epoxy binder. A composite material of the type mentioned is known in Italy under the trade name "FERROZEL" type KLFF.
The device described above makes it possible to transmit the movement to the blade (L) enclosed in a corresponding casing, as illustrated in FIG. 3, which allows it to be adjusted even during its rotation. In addition, the reduced size of this device makes it possible to position textile dust extraction means on the machine for chenille yarn, which proves to be extremely difficult with the use of traditional reducers.

Claims (7)

Speed reducer for controlling a yarn forming group in a machine for chenille yarn, wherein said yarn forming group comprises a gauge (32) with motor (320) for winding and dimensioning the yarn. Indeed, a blade (L) to cut into sections the effect wire (FE) thus wound on the gauge and two externally knurled wire guide wheels (31) with the corresponding idler wheels (310) mounted on the side opposite to the wheels (31) relative to the gauge (32) for driving the binding threads (FL) and the ends of the effect thread and with a drawing group composed of several rollers (200) for feeding the threads tying (FL), and with means for recovering and twisting the tying son (FL) with the ends of effect yarn (FE) interposed, characterized in that comprises, in combination, a first shaft (2) on which are wedged three cylindrical gears (R2, R3, R8), said wheel (R2) being driven by a e driving wheel (R1) wedged on the shaft of a drive member (M), a second shaft (6) on which are wedged two cylindrical toothed wheels (R2 ', R3') and a bevel gear (R6), said wheel (R2 ') meshing with the aforementioned wheel (R2) and said pinion (R6) being driven relative to a ring gear (R7) mounted on a shaft (37) perpendicular to the shaft (6), a third shaft (45) parallel to the aforementioned trees (2) and (6), on which is fixed a cylindrical toothed wheel (R9) which meshes with the wheel above (R8) of the shaft (2), a fourth shaft (50) on which is wedged a bevel gear (R10) and connected to said shaft (45) by means of a seal (49), said bevel gear (R10 ) meshing with a bevel wheel (R11) whose shaft is intended to transmit the rotational movement of the blade (L), a fifth shaft (22) on which is fixed a cylindrical toothed wheel (R5) driven by the wheel (R3) of the shaft (2) and in turn driving a wheel (R4) mounted on a shaft (24), a sixth shaft (22) on which is wedged a cylindrical toothed wheel (R5 ') which is driven by a wheel (R3 ') of the shaft (6) and in turn drives a wheel (R4') wedged on a corresponding shaft, in that said wheels (R2, R2 '), (R5, R5') and (R4, R4 ') are respectively identical to each other and said wheels (R6) and (R7) have the same module and the same number of teeth, in that on the shafts of said wheels (R4) and (R4') the two driving wheels (31) are chocked binding threads (FL) and sections of the effect thread (FE), in that the shaft (37) of the aforementioned crown (R7) is intended to transmit the movement to the rollers of the drawing group for feeding the binding threads (FL), so that the number of turns of the rollers (200) of the drawing group is equal to that of the thread guide wheels (31) and in that said shafts (2) and (6) are supported by a shell structure (CF) in two watertight elements (17, 18), fixed on the chassis (19) of the machine: the shafts of the wheels (R5, R4) and respectively (R5 ', R4' ) being supported by corresponding housings (CM) each of which is produced in two elements (26, 27) and is pivotally mounted around the shaft (2), and respectively (6), on said fixed casing (CF), so that the shafts of said wheels (R5, R4 ) and (R5 ', R4') can rotate rigidly around the shafts (2, 6) of said wheels (R2, R2 ') between two limit positions, one working, that is to say contacting the wheels (31) with the gauge (32) and the other out of service to allow access to the gauge (32), with the wheels (31) in rotation. Reducer according to claim 1 characterized in that said wheel (R1) is connected to the shaft (1) corresponding by means of a tongue (7); said shaft (1) being supported by bearings (5) housed in said fixed casing (CF). Reducer according to one or more of the preceding claims, characterized in that the said wheels (R2) and (R8) are fixed to the respective shaft (2) by means of a common tongue (8) the said shaft (2) being supported by two radial bearings (3) of which is accommodated in a corresponding fixed ring (12) situated opposite the shaft (2) and the other is housed in a cap (11) of the fixed cover (FC), in that said wheel (R3) is connected to the shaft (2) by means of a corresponding tongue (9), in that said wheel (R2 ') is connected to the respective shaft (6) by means of a corresponding tongue (14) and held in place by means of a spacer (13), said shaft (6) being supported by corresponding radial bearings (15) one of which is housed in a corresponding fixed ring (12) located opposite the tree (6) and in that said fixed casing (CF) is centered on said rings (12), which are, in turn, centered on corresponding arms (21) fixed to the chassis (19) of the machine. Reducer according to one or more of the preceding claims, characterized in that each of said wheels (R5, R5 ') is held in place by a corresponding bearing (23) mounted on the respective shaft (22), in that each wheel (R4, R4 ') is fixed to the respective shaft (24) by means of a corresponding tongue (30), in that said wheel (R6) is connected to the corresponding shaft (6) by means of a tongue (16 ) and held in place by the stop action performed by a bearing (4) acting on a base (34) which is housed inside a corresponding casing (41), the base (34) being provided with '' a seal (35) and in that said wheel (R7) is connected to the corresponding shaft (37) by means of a tongue (36), the shaft (37) being supported by a pair of juxtaposed oblique bearings (38) housed in a corresponding seat provided in the aforementioned casing (41). Reducer according to one or more of the preceding claims, characterized in that each of said shafts (24) is hollow, that is to say provided with a longitudinal hole for housing another shaft (29) with connecting tongue ( 28) which is provided with an adjustment member (33) for adjusting its axial position and is coaxial with the upper part of an "L" arm supporting a corresponding wheel (31). Reductor according to one or more of the preceding claims, characterized in that said wheel (R9) is mounted by means of a tongue (46) on the corresponding shaft (45) said shaft (45) being supported by two bearings (47, 48 ) one of which (47), fixed, is housed in a corresponding seat formed in the element (17) of said first casing and the other (48), oscillating radially, is housed in a corresponding groove in the chassis (19) . Reducer according to one or more of the preceding claims, characterized in that the said wheels (R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R2 ', R3', R4 'and R5') are made of composite material.

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