US2672723A - Textile machinery - Google Patents

Description

March 23, 1954 H. c. BECHTLER 2,672,723 TEXTILE MACHINERY Filed June 22, 1949 2 Sheets-Sheet l IN VEN TOR. M W

BY 44 5-, I

March 23, 1954 FIG.4

INVENTOR.

A N EQ/ H. c. BECHTLER 2,672,723 TEXTILE MACHINERY the yarn guide eyelets, at

Patented Mar. 23, 1954 2,672,723 TEXTILE MACHINERY Hans Carl Bechtler,

corporation of Delaware Application June 22, 1949, Serial No. 100,561

Claims priority, application Switzerland June 28, 1M8

Claims.

This invention relates to improvements in text1le machinery and more particularly to imemployment of small quantities of air.

Devices on spinning frames are known in which the thread guide eyelets of the yarn feed motion Such devices are known as end Since, however, the

moving beyond the range of the nozzle suction. The cross-sectional areas of the air ducts and the power of pneumatic installation, and conse quently the initial and operating cost of the same, thus becomes very high because of the relative 1y large cross-sectional areas of the nozzles. Even so, the second main purpose of the yarn breakage suction exhauster, namely, the continuous removal from the draw frame rollers on the delivery side of dust and flufi beyond the stretch travelled over by the yarn in its reciprocating motion is not achieved at all or is only achieved to a very inadequate degree.

These drawbacks can be overcome by the present invention in that, in addition to the machine cross-member, for the reciprocating actuation of cycle or rhythm differing ciprocating motion of the yarn guide eyelets, the cycles used being timed in relation to each other. Investigations have disclosed the fact that differences exist between the reciprocating movement of the yarn guide eyelets and the change in position of the yarn on the delivery side of the draw frame thereby achieved. These dif- Zurich, Switzerland, assignor to Pneumafil Corporation,

Charlotte, N. 0., a

ferences may, according to the design of the particular spinning frame, assume substantial proportions.

Through the fact that the ciprocating movement of the nozzles is, to allow for these differences, so selected as to differ from the cycle of the reciprocating movement of the yarn guide eyelets, it is possible, without detriment to the eiiectiveness of the nozzles, to arrange for the nozzle apertures, and consequently the necessary cuantity of air handled by the pneumatic installation, to be kept extremely small.

Figure 1 is a diagrammatic view of a spinning machine embodying the present invention;

Figure 2 is a View in elevation of a portion of a spinning machine including a modification of the present invention;

Figure 3 is a plan View of a portion of the machine shown in Figure 2;

Figure 4 is a view in elevation of a further modification; and

Figure 5 is a plan view of a portion of the machine shown in Figure 4.

In the embodiment shown in Fig. 1 a spinning machine with a two-unit draw frame is shown. Each draw frame unit comprises four nip rollers per thread of yarn filament, namely, the fluted cycle of the refluted intake rollers I of the various drawing frames are mounted on a driven shaft 5 and, correspondingly, the fluted delivery rollers 3 are mounted on another driven shaft 6. The roving paid out by the is drawn into the draw frames take rollers 3; the roving is there drawn and the yarn so obtained is finally taken up by the driven spindles H. The roving is in this process led, before reaching the draw frames, through yarn uide eyelets 9 and the finished yarn is led, before reaching the spindles, through yarn guide lappets it.

The yarn guide eyelets 9 are moved to and fro, by means of the yarn feed motion, parallel to the axes of the draw frame rollers l to 4. To this end the yarn guide eyelets 9 are arranged on a machine cross-member l2 displaceable along its longitudinal axis, which cross-member may for instance be moved reciprocatingly by a crank pin it through a rod 33. The crank pin M of the yarn feed motion may be driven by a shaft N5 of the spinning frame through a suitable intermediate gear shown in Fig. 1 as an ordinary intermediate gearwheel [5. The reciprocating mofrom theshaft I 6 placed radially. 'Thisadjustability is tion of the yarn guide eyelets s moves the roving yarn 8 in the axial direction of the draw frame rollers and thereby prevents the wearing of undesirable grooves in the rollers of the draw frame. The position indicated by a dotted line of the crank pin M, the rod l3 and the yarn guide eyelets 9":produces the'course 8, shown by dotted lines, of the yarn through the spinning frame. The actuating devices for the draw frames, for the spindles H and for the shaft it of the yarn feed motion are omitted to avoid confusion in the drawing.

Between the fluted delivery rollers 3 of the draw frames and the yarn guide lappets l8, nozzles H of a pneumatic installation are arranged. These nozzles may consist of simple and preferably slot-shaped apertures in a collecting duct 18, which is connected by an articulated member 25 to the fan 20. The pneumatic installation is so designed that the fan 2s sucks in air from the nozzles H in the direction shown by the arrows in the drawing. Dust, flufi, broken yarn-ends and the like are drawn in by the nozzles l1 and the particles so removed are collected inthe separator 19.

Contrary 'to what is the case with the known devices, a further machine cross-member is provided the sole purpose of which is to cause the reciprocating motion of the nozzles ll. This machine cross-member may, as already indicated in Fig. 1, be the collecting duct is itself on which the nozzles 11 are mounted. The collecting duct 1'8 is for this purpose so designed as to be displaceable in its longitudinal direction, and is moved to and fro through a system of rods 2|, 22 by a crank pin 23. Said crank pin 23 is driven through an intermediate gearwheel 24 or through an intermediate gearing, in such a manner that the two crank pins l4 and 23 respectively rotate'at the same speed in the same direction.

The collecting duct IS with the nozzles I? is controlled and moved to and fro out of synchronism with the yarn guide eyelets 9. The cycle of motion of said collecting duct 58 with the nozzles 11 may diifer simply in the fact that the amplitude of the reciprocating movement of the nozzles I1 is smaller than that of the reciprocating movement of the yarn guide eyelets 9. The more numerous the pairs of rollers possessed by the draw frame, the smaller must be the amplitude of the reciprocating movement of the nozzles, so that the yarn filaments are at all times within the range thereof. The position shownby a dotted line of the yarn filament 8', the nozzles l1 and the collecting duct 13', the rod system 22 and the crank pin 23 illustrates these circumstances. But even if the draw frame comprises two pairs of rollers only, the necessary amplitude .of movement of the nozzles ll is smaller: than that of the yarn guide eyelets 9, because the vyarn filaments, on account of the rigidly mounted yarn guide lappet 10, are displaced less far on the delivery rollers -3 than on the intake rollers l of the draw frame. For these reasons it is desirable to provide a device by means of whichthe amplitude of the reciprocating move mentor the nozzles is adjustable in relation to that of the reciprocating movement of the yarn guide eyelets. Such a device may, in its simplest form, consist in an arrangement whereby the pivot pin by means of which the system of rods 22 is-articulated to the crank pin 23 can be disindicated guide eyelets 9. the reciprocating movement of the yarn guide in the drawing by the slot 29 radially provided in the crank pin 23.

If th speed of the reciprocating movement of the yarn guide eyelets is not minute in relation to the speed at'which the roving enters the draw frame, the yarn leaving the drawn frame lags behind the reciprocating movement. The nozzles H in such case are controlled to follow a cycle lagging behind that of the yarn If the distance-time curve of eyelets is sinusoidal, the corresponding distancetime diagram is,=as a first approximation, a phaseshifted sinusoidal curve of lesser amplitude in accordance with which the nozzles ll should be moved to and fro. Preferably, therefore, suitable means are provided by which the phase position of the reciprocating movement of the nozzles is adustable in relation to that of the reciprocating movement of the yarn guide eyelets. In Fig. 1, for example, such an adjustment of the phase may be effected by temporarily removing the intermediate gearwheel 24, off-setting the crank pin M with the shaft It in relation to the crank pin 23 by the desired phase angle, and then replacing the intermediate gearwheel 24.

If, on the other hand, the reciprocating movement of the yarn guide eyelets 9 does not follow a sinusoidal course, the cycle of the reciprocating movement of the nozzles coincides with that of the yarn guide eyelets only as regards the "periodic duration of the reciprocating motion, whilst within the period the nozzles may be controlled to a cycle the time curve of which deviates completely from that of the yarn guide eyelets. If, for example, the distance-time curve of the reciprocating movement of the yarn guide eyelets 9 is a zlg-zag curve consisting of straight lines, then the nozzles may be controlled in accordance with a cycle derived from a sine curve distorted by uneven harmonics, the zero points (origins) of the distorted sine curve being out of synchronism with the zero points of the zigzag curve in that they lag behind the latter, and the amplitude of the distorted sine curve being less than that of the zig-zag curve.

Th separate control. of and nozzles respectively by means of different machine cross-members thus makes it possible, even in the case of reciprocating motions at more substantial speeds, for the yarn filaments to remain at all times within the range of the nozzle suction. Sufiicient exactness is almost always achieved when, as in Fig. 1, merely the amplitude and phase of the reciprocating movement of the nozzles are correctly set.

In order to achieve at the same time the most thorough possible cleaning of the draw frame rollers under conditions of minimum air consumption it may be found advantageous purposely to produce small divergences between the movement of "the nozzles and the changes in position of the yarn filaments. If, for instance, by means of the nozzles, the fluted delivery rollers are at the same time to be kept clean beyond the distance covered by the yarn in its reciprocating sweep, it is advantageous to impartto the re'cip'rocating movement of the nozzles an amplitude of movement greater than that of the yarn. In'the case also of the recently-adopted cyclic control of the yarn guide eyelets in which a rapid 'reciprocating movement of small amplitude is superimposed upon a slow reciprocating movement of'large amplitude, it may prove expedient to the yarn guide eyelets follow only approximately with the nozzles. It

the correct amplitude and phase and not to participate in the rapid reciprocating movement. In the present example of roller cleaning, as in that described previously, the length of the nozzle slot is made somewhat greater than would be necessary if the nozzles were exactly to follow the movements in question.

The machine cross-members provided for the yarn guide eyelets and nozzles are, as shown in Figure 1, simultaneously driven from a common shaft I 6, suitable mechanism being provided to permit separate control of such members. In stead of mechanical coupling of this type, electrical coupling is also possible.

A particularly convenient structural arrangement is achieved when the machine cross-member provided for actuating the nozzles is itself moved backwards and forwards and the portions of the pneumatic equipment carrying the nozzles are entrained by the machine cross-member in its reciprocating movement. With this construction it is possible by simple means so to effect the connection between the nozzles and the machine cross-member which moves same backwards and forwards that the distance between the nozzles and the draw fram is easily adjustable and further that the nozzles can be swung out of their normal operating position, which is near to the delivery nip rollers. Such an arrangement substantially facilitates not only the overhaul, and replacement of the nozzles, but also, when longstapled material is being spun, the knotting of broken ends between the draw frame and the spindle. Typical embodiments in this connection are shown diagrammatically in Figs. 2 to 5 of the drawing.

Figures 2 and 3 illustrate a modification of the invention. In Figure 3 th nip rollers, the yarn guide eyelet 9 with its bracket 27, the machine cross-member l2 and the yarn filament it are omitted to obviate confusion. The collecting duct 50, which extends in Fig. 2 perpendicularly to the plane of the drawing and in Fig. 3 in the plane of drawing from top to bottom, is stationary. The nozzles 5| are mounted in groups on hollow cylinders or ducts 52 which in turn are connected by articulated conduits, as for example rubber tubes 53, to the stationary collecting duct 5|]. cylinders 52 of the spinning machine, Figs. 2 and 3 illustrating one cylinder, are secured by means of angle brackets 54 direct to the reciprocating machine cross-member 55. The movement of the machine cross-member 55 is participated in by the cylinders 52 and the nozzles 5| mounted thereon, as indicated by the positions 5|, 55' and 52' of these parts shown by means of dotted lines in Fig. 3.

In Figs. 2 and 3, moreover, means are indicated by means of which the distance between the nozzles 5| and the fluted delivery rollers 3 of the draw frames may be adjusted independently of the reciprocating movement of the nozzles. For this purpose the cylinders 52 are mounted on the angle brackets 54 so as to be rotatable on axes parallel to the axes of the fluted rollers 3. By the rotation of the cylinders 52, the nozzles 5| are likewise rotated, so that the distance between the nozzles 5| and the fluted rollers 3 is adjustable between the limit positions 5| and 5|. The stop 56 serves to limit the swivelling movement of the nozzles. To facilitate knotting of broken threads, the nozzles 5| are swung away from the fluted rollers to the position 5| and,

All the when knotting up has been performed, restored to position 5|. Said position 5| should be at least a fingers breadth further away from the fluted rollers 3 than the normal operating position 5| 0! the nozzles.

cross-member l2 provided for the reciprocating movement of the yarn eyelets, are, for reasons of clarity, not shown. The yarn eyelets 9 (Fig. 4) which move the yarn 8 to and fro in the axial direction of the fluted rollers I and 3 are mounted on brackets 21 which are secured direct to the machine cross-member 12. The machine crossmember 60 provided for the actuation of the nozzles 6 I is fitted directly below the cross-member i2, an arrangement which may prove advantageous for structural reasons in the case of two-unit draw frames. The two machine cross-members l2 and 60 are reciprocatingly moved, in Fig. 4, by

tion perpendicular to the plane of the drawing, and in Fig. 5 from top to bottom in the plane of the drawing. The dotted line 60" in Fig. 5 shows the amplitude of the reciprocating movement. All

ted from Figs. 4 and 5.

Contrary to what is the case in Fig. 1, in Figs. 4 and 5 the collecting duct 62 is rigidly mounted in the machine frame. Each nozzle 6 I -in Fig. 5 only two such nozzles are shown-is mounted on its own nozzle-pipe 53 which is articulately Said slot is so dimensioned (Fig. 4:) in the direction of normal pay-out of yarn 8" that on the one hand the nozzle-pipe 53 is prevented from bearing on the fluted roller 3 and on the other hand the nozzle 6| with its nozzlepipe 63 is swingable away from the fluted roller 3 into the positions 6|" and 63 indicated by dotted lines. The upper, normal operating position, indicated in plain lines, of the nozzles 6| is fixed by means of a spring 6! secured to the nozzle-pipe 63, which spring snaps into a recess provided on the flat iron strip 65.

for removing by pneumatic suction dust, fluff, broken yarn ends and the like, the nozzles being :placedxbetween the rollers 'and theSpindles-of .the machine, and mechanism for reciprocating the nozzles in theaxialdirection of therollers in "a cycle differing from that of the reciprocating I movement of the yarn guide eyelets.

-2. "In combination with 'a spinning frame, draw "frame rollers, yarn guide eyelets through which 'rovings are supplied to the rollers, a machine cross-member connected to the eyelets, means for reciprocating the-machine cross-memberand pneumatic suction dust, fluff, broken yarn ends and the like, the nozzles being placed between the rollers and the spindles of the machine, and means for reciprocating the second machine cross-member in the axial'direction'of the rollers in a cycle'differing from that of the reciprocating movement of the yarn guide eyelets.

'3. A spinning machine according to claim 2 including a device to adjust the amplitude of the reciprocating movement of the nozzles in relation to that of the reciprocating movement :of the yarn guide eyelets.

4. A spinning machine according to :claim 3 including a device for adjusting the phase'pos'ition of the reciprocating movement of the nozzles in relation to that'or the reciprocating movement of the yarn guide eyelets.

5. In combination with a spinning frame, draw frame rollers,yarn guide eyelets through which rovings are supplied to the rollers, a machine cross-member connected 'to the-eyelets, means for reciprocating the machine cross-member and 'eyelets in a predetermined cycle in the axial direction 'of the rollers, a second machine'cr'ossmember, a duct moved by said second machine cro'ss member, nozzles insaid duct for removing by pneumatic suction dust, flufi, broken yarn'ends and the like, the nozzles being placed between the rollers and the spindles of the machine, and means for moving the second machine crossmember and the duct carrying the nozzles backwards and forwards in the axial direction of the rollers inacycle differing from that of the reciprocating movement of the yarn guide eyelets.

'6. In combination with a spinning machine, draw frame rollers, yarn guide eyelets through which rovings are supplied to the rollers, means 'for reciprocating the eyelets in a predetermined cycle in the axial direction of the rollers, a plurality of nozzles for removing by pneumatic suction dust, fluff, broken yarn ends and the'like,

the nozzles being placed between the rollers and the spindles of the machine, a fixed collecting duct, nozzle-pipes connecting each nozzle with the collecting duct, a machinecross-memberconnected to the nozzle-pipes, and means for reciprocating the machine cross-member in the axial direction of the rollers thereby reciprocating the connected nozzles.

'7. A spinningmachine according to claim 6 including a device in which the machine crossmember carries a strip having a slot through which the nozzle-pipe extends, the nozzle pipe being movable in a vertical direction in said-slot, and a flexible member for securing the nozzlepipe in place in said slot.

8. A device according to claim 6 characterized by the fact that means are provided to permit adjustment of the distance separating thenozzles from the nip rollers on the delivery side of the draw frame approximately in the direction of the yarn being paid out.

9. A spinning machine according to claim 8 characterized by the fact that in normal operation the nozzles are moved backwards and forwards adjacent the delivery nip rollers of the draw frames, and that the means to permit adjusting the distance between the nozzles and the rollers are such as to permit the nozzles being swung away from the delivery of the nip rollers by at least the breadth of a finger.

10. In combination with a spinning frame, draw frame rollers, yarn guide eyelets through which rovings are supplied to the rollers, a machine cross-member connected to the eyelets, means for reciprocating the machine crossmember and eyelets in a predetermined cycle in the axial direction of the rollers, a second machine cross-member, aplurality of ducts moved by said second machine cross-member, nozzles arranged in groups on said ducts for removin by pneumatic suction dust, fluff, broken yarn ends and the like, a collecting duct, flexible lines connecting the nozzle ducts tothe collecting ducts,

.-- the nozzles being placed between the rollers and the spindles of the machine, and means for moving the second machine cross-member and the ducts carrying the nozzles backwards and forwards in the axial direction of the rollers.

HANS CARL BECHTLER.

References Cited in the file of this patent UNITED STATES PATENTS Number

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