US3196493A - Loading device for top rollers op drawing mechanisms op spinning machines - Google Patents

Description

July 27, 1965 s. KEMMLER LOADING DEVICE FOR TOP ROLLERS OF DRAWING MECHANISMS OF SPINNING MACHINES 2 Sheets-Sheet 1 Filed July 24 1961 INVENTOYR SIjMU-"M/ mm/er ATTORNEYS July 27, 1965 s. K MLER 3,196,493

LOADING DEVICE FOR ROLLERS OF DRAWING MECHANISMS OF SPINNING MACHINES Filed July 24, 1961 2 Sheets-Sheet 2- INVENTOR slam/v0 KEMMLfR ATTORNEYS United States Patent 3,196,493 LOADING DEVICE FUR T01 ROLLERS 0F DRAWING MEEHANISMS 0F SPINNING MACHINES Sigmund Kemmler, Geislingcn, Steige, Wurttemberg, Germany, assignor to Wurttembergische Spindelfabrik G.m.b.H., Sussen, Wurttemherg, Germany Filed July 24, 1961, Ser. No. 126,320 Claims priority, application Germany, Aug. 19, 1960, W 28,406 11 Claims. (Cl. 19-272) The present invention relates to a loading or weighting device for the top rollers of drawing mechanisms of spinning machines, and more particularly to a magnetic loading device for such top rollers.

For loading the top rollers of drawing mechanisms of spinning machines it has already been proposed to magnetize these rollers, which are made of steel, so that the magnetic forces acting between them and the bottom rollers will produce the desired load thereon. This manner of loading the top rollers has been primarily applied to the slip rollers of slip-draft mechanisms in which the magnetization was intended to effect a retarding action upon the slip rollers in order to take up the angular momentum of these rollers. It has also been proposed to provide the top rollers with a core of a magnetically highly saturable alloy in order to produce a sufficient clamping pressure.

Since with such devices it must always be expected that the magnetic top rollers will also attract other metallic bodies, and since such rollers prevent the use of the conventional bearing means therefor because of the interference which they would cause in the magnetic flux, it

has also already been proposed to provide each bearing saddle with a magnet at the side facing toward the respective bottom roller. Such an arrangement allows, however, very little space for the magnets, and the magnetic forces generated are therefore hardly sufficient to produce a clamping pressure of an adequate strength.

It is an object of the present invention to provide a magnetic loading or Weighting device for the drawing mechanism of a spinning machine in which the magnets may be made of such a size that practically any desired loading pressure may be attained. This object is attained according to the invention by the provision of magnets for loading each top roller formed of two parallel arms and a magnetic block, by securing these magnets on the guide arms of the top rollers by means of special holders, by making the bearing members or bearing saddles for the top rollers of a nonmagnetizable material, and by mounting these bearings between the two arms of each magnet so as to be held or guided thereby. These bearings or saddles for the top rollers are preferably made of plastics.

The saddle-shaped bearings may be placed directly upon the shafts of the top twinrollers or the bearing members which are mounted between the arms of the magnets may be fitted upon the end journals of the top rollers. It is also possible to apply a combination of these arrangements, in which case each top twinroller is then loaded by three magnets. Each loading magnet or pair of magnets may be adjustably mounted on and secured to a separate arm which may be pivoted about an axis which lies within an arc the center of curvature of which lies within the axis of the respective bottom roller when the top roller is in the operative position. The loading magnets may, however, also be mounted on a common supporting arm and each of them may be pivotable on said arm about a pin or bolt which is adjustable within an arcuate slot. Especially if the magnets act upon the two end journals of each top roller, it is possible according to the invention to guide the magnets relative to the respective bottom roller by means of simple bifurcated members of a nonmagnetic material, for example, of plastic. If the bearing members or saddles between the magnet arms are designed so as to be adjustable in the direction of these arms, small differences in the thickness of the coatings or covers on the top rollers may be easily compensated so that the air gap between the magnet and the bottom roller and thus also the load upon the latter will remain uniform. The bearing members or saddles may, however, also be similarly adjusted for varying the size of the air gap and for thus varying the force of the load. In order to facilitate the manipulation and servicing of the mechanism, the same may also be designed so that, when the supporting arm or arms are pivoted upwardly, the individual top rollers will not be lifted simultaneously but will be successively lifted off of the bottom rollers. This considerably facilitates the interruption of the different magnetic circuits and also permits a partial release of the drawing mechanism.

The aforementioned as well as additional objects, features, and advantages of the present invention will become more clearly apparent from the following detailed description thereof, particularly when the same is read with reference to the accompanying drawings, in which FIGURE 1 shows a drawing mechanism with several supporting arms in a longitudinal section taken along line I-I of FIGURE 2;

FIGURE 2 shows a cross section taken along line 11-11 of FIGURE 1;

FIGURE 3 shows a side view of a magnet which is tted upon an end journal of a top roller;

FIGURE 4 shows a front view of a magnet according to FIGURE 3; while FIGURE 5 shows a side view, partly in section, of a drawing mechanism with magnets mounted on a common supporting arm.

Referring first to FIGURES 1 and 2 of the drawings, the individual supporting or guide arms 1, 1' and 1" for the top twinrollers 2, 2', and 2" of the drawing mechanism carry magnet supports 3, 3', and 3" which are provided with arcuate dovetailed guide surfaces 4, 4, and 4", respectively. The centers of curvature of the arcs of guide surfaces 4, 4', and 4 coincide in the operative position with the axes of the bottom rollers. It is thus possible to adjust the top rollers freely toward the front or rear relative to the bottom rollers without changing the distance of the pole faces from the bottom rollers.

The magnet supports 3, 3', and 3" carry magnet holders 5, 5, and 5" which may be clamped to the arcuate dovetailed guide surfaces 4, 4', and 4", respectively. The sides of the magnet holders facing toward the bottom rollers are also provided with dovetailed guides 7, as shown in FIGURE 2, which, however, are not curved but straight. These guides 7 are adapted to receive magnet arms 8, 8', 8", and 9, 9', 9", respectively, the upper ends of which extending beyond the magnet blocks 1%, 19', and It)" are slipped over the guides 7'. The magnets are locked to the magnet holders by means of shims 11, 11, and 11 which are secured by bolts 6, 6, and 6", respectively. The position of shims -11' has been illustrated in FIGURE 2. Underneath the magnet blocks '10, 1t), and 10", the nonmagnetic saddle- shaped bearings members 12, 12', and 12" for the shafts 13, 13', and 13" of the top rollers are mounted between the two arms of the respective magnets. Wedge gibs 14, 14, and 14- which are slidable in :a direction vertically to the magnet arms permit the bearings 12, 12, and 12" to be adjusted by setscrews in the direction of the magnet arms, whereby the distance between the pole faces and the bottom rollers may be very accurately regulated. The lower ends of the magnet arms serving aspole pieces are I duced by the three magnets may thus be overcome suc-i cessively which facilitates the manipulation of. the

mechanism. e V

FIGURES 3 and 4 illustrate a modification of the in vention as applied to individual top rollers or twin top rollers, which have a journal 47 on each outer end.

magnetic circuit between these two rollers.

further raised, magnet holder 55 takes along arm 51 and pivots the same about rod 66, whereby pawl 69 engages with hook 7i), lifts the central magnet and top roller off the associated bottom roller, and thereby interrupts the Not until this has occurred during the continued upward move- 'ment of arm 51, will pawl 69' also engage with hook 74)v and lift the last magnet and top'roller off the associated bottom-roller. The interruption of the different magnetic circuits thereforeoccurs successively and may thus be carriedjout without any great physical effort. If the distances between pawl 6g and the clamp "76 provided on the magnetic'holder 55' is maintained considerably Each of these journals 47' of each top rollerv or twin top.

roller. may be equipped with a magnet which consists of the magnet arms 38 and 3? and the magnet block 40 between these arms. The nonmagnetic bearing member 42 is slipped over journal 47 and it may be adjusted in a direction parallel to the magnet arms by the Wedge gib 44 by means of a setscrew 48. :A bifurcated member 34- which may consist, for example, of plastic, is

firmly secured tothe magnet'by screws 49; If the lower ends of the. magnet arms 38 and '39 are'disposed at the same distance from thebottomjroller, the magnetic greater than the distance of pawls 69' fromthe clamp 7d, then the magnetic flux of the pairof inlet rollers 52",62 will initially be interrupted during the upward movement of arm 51, and only thereafter that of the central pair of rollers 52', 62C I I If arm 5l'is pivoted upwardly directly and magnet holder 55 is not raised by handle 68, the feed rolleror the central top roller or. both may be released without affecting the load upon the delivery roller. However,

7 the air gap ofthe magnet for the delivery roller then "changes slightly so that the load is slightly decreased.

Such a partial release of the load during which the yarn still remains clamped betweenthe delivery-rollers is sometimes desirable when the machine is to. remain inoperative forces act'symmetrically relative to the longitudinal axis of the magnet which also intersects with the axis of the top roller. The twoarms of the bifurcated member 34 which surround the bottom roller are then not subjected to any lateral forces so that the friction between these two arms and the bottom roller is of no conse- 1.

quence, especially if member 34 is made of a plastic with good bearing properties. merely have to serve the purpose of insuring thatthepole The two'arms of member 34 pieces, that is the lower endsof the magnet arms 38 and V 39 remain equally spaced from the bottom roller.

FIGURE 5 illustrates .a further modification of the invention in which a single main supporting arm 51 which is pivotable about the fixed supporting rod 66 is provided for the magnets of all three top rollers. Supportby sliding the pivot pin or bolt 67 along slot 5 Magnetholder 55 is provided with an extension 68 which serves as an operating handle.

arm 51 further carries pawl-like brackets 69 and 69' which are adapted to hook over projections 7t? and 7th on. the I magnet holders 55 and 55", respectively, and are adjustable relative to magnet holders55 and 55" and their hookl shaped projections 76) and 74?, respectively. The distance between the engageable surfaces of parts 69 and 79 is The supporting ing arm 51 carries the magnet supports 53, 53', and 53 which are slidably adjustable thereon The magnet hold- .or backwardly relative to the associated bottom roller scribed with for'agreater length of time, forexample, for several days. Although my invention has been illustrated and dereference to the preferred embodiments thereof, I wish to have it understood that it is in no way limited to the details of such embodiments, but is capable of numerous modifications within the'scope-of the appended claims.

Having thus fully disclosed my invention, what I claim is: a

1-. A device for loading the top 'rol'lers of a' drawing mechanism for a spinning machine comprising at least one pair of associated top and bottom rollers, at least a part of said bottomroller consisting of a'magnetizable material, a supporting arm, means for pivotably mounting said supportingarrn near one end, magnet means associated with said pair of topand bottom, rollers, said magnet means including a pair of spaced magnet arms, means f for securing one end of each magnet arm of said magnet means to said. supporting arm, the other end of each of said magnet arms opposite said supporting arm being spaced by 'an air gap from said magnetizable part'of said bottomyroller, and abearing member of a non-magnetizable material mounted between said magnet armsfor r0- itatably mounting said-top rollen; g 2. A device for. loading the top rollers of a drawing mechanism for a spinning machine comprisinga plurality of pairs of associated top and bottom. rollers arranged preferably made smaller than'the distance between the engageabie surfaces of parts 69" and iii. Whenthe separately from and behind each other in, a row at least a part of each of said bottom rollers consisting of a magnetizable material, a' plurality of supporting arms, means for pivotably mounting each supporting arm near one end thereof, magnet means associated with each respective pairof top and bottom rollers, each said magnet means including a pairof spaced, essentially parallel magnet arms anda magnet block secured between said magnet arms to maintain'the same in spaccd'relationship, means for seroller and the" associated magnet will be interrupted.

Magnet holder 55 will then be, arrested. in its upward position by a snap spring 72 on arm 51 which engages curing one end ofeach magnet arm of a respective magnet a spaced by an air gap from said magnetizable part of each into a detent 71. In this manner it is possible to release I and also to remove the top delivery roller without requiring the supporting arm 51 to be pivoted upwardly. a

If arm 51 should be pivoted upwardly for cleaning,-

1 rollers;

releasing, or removing any or all top rollers magnet v holder 55 is first pivoted by handle 68' until its detent respective bottom roller, and a bearing member of non magnetizable material mounted between said magnet arms 'of each magnet means for lrotatably mounting said top 7 3. A ldevice for loading the top rollers of a drawing mechanism fora spinning machine comprising at least one pair of associated top and bottom rollers, at least a part of said bottom roller consisting of a magnetizable material, at least one supporting arm, means for pivotably mounting said supporting arm near one end thereof, magnet means associated with said pair of top and bottom rollers, said magnet means including a pair of paced magnet arms, means for securing one end of each magnet arm of said magnet means to said supporting arm, the other ends of said magnet arms opposite said supporting arm being spaced by an air gap from said magnetizable part of said bottom roller, a bearing member of a nonmagnetizable material mounted between said magnet arms for rotatably mounting said top roller, and means for adjusting the position of said bearing member in a direction parallel to said magnet arms.

4. A device for loading the top rollers of a drawing mechanism for a spinning machine comprising at least one pair of associated top and bottom rollers, at least a part of said bottom roller consisting of a magnetizable material, at least one supporting arm, means for pivotably mounting said supporting arm near one end thereof, magnet means associated with said pair of top and bottom rollers, said magnet means including a pair of spaced magnet arms, means for securing one end of each magnet arm of said magnet means to said supporting arm, the other ends of said magnet arms opposite said supporting arm being spaced by an air gap from said magnetizable part of said bottom roller, a bearing member of a nonmagnetizable material mounted betwen said magnet arms for rotatably mounting said top roller, said bearing member having a surface inclined to said magnet arms, a wedge-shaped member between said magnet arms engaging with said inclined surface, and means for adjusting said wedge-shaped member in a direction substantially at right angles to said magnet arms for adjusting the position of said bearing member in a direction parallel to said magnet arms.

5. A device for loading the top rollers of a drawing mechanism for a spinning machine comprising at least one pair of associated top and bottom rollers, at least a part of said bottom roller consisting of a magnetizable material, at least one supporting arm, means for pivotably mounting said supporting arm near one end thereof, magnet means associated with said pair of top and bottom rollers, said magnet means including a pair of spaced magnet arms, means for securing one end of each magnet arm of said magnet means to said supporting arm, the other ends of said magnet arms opposite said supporting arms being bent toward each other and their end surfaces spaced by an air gap from the peripheral surface of said magnetizable part of said bottom roller, a bearing member of a nonmagnetizable material mounted between said magnet arms for rotatably mounting said top roller, and means for adjusting the position of said bearing member in a direction parallel to said magnet arms.

6. A device for loading the top roller of a drawing mechanism for a spinning machine comprising at least one pair of associated top and bottom rollers, at least a part of said bottom roller consisting of a magnetizable material, at least one supporting arm, means for pivotably mounting said supporting arm near one end thereof, magnet means associated with said pair of top and bottom rollers, said magnet means including a pair of spaced magnet arms, means for securing one end of each magnet arm of said magnet means to said supporting arm, the other ends of said magnet arms opposite said supporting arm being spaced by an air gap from said magnetizable part of said bottom roller, at bearing member of a non-magnetizable material mounted between said magnet arms for rotatably mounting said top roller, means for adjusting the position of said bearing member in a direction parallel to said magnet arms, and a bifurcated member of a non-magnetizable material mounted on said magnet arms and having a pair of guide arms, said magnetizable part of said bottom roller being disposed between said guide arms and in slidable engagement therewith for maintaining the open ends of said magnet arms at an equal distance from said magnetizable part of said bottom roller.

7. A device for loading the top rollers of a drawing mechanism for a spinning machine comprising a plurality of pairs of associated top and bottom rollers arranged separately from and behind each other in a row, at least a part of each of said bottom rollers consisting of a magnetizable material, each of said top rollers being formed by twin rollers and a shaft portion interconnecting said rollers, a plurality of supporting arms, means for pivotably mounting each supporting arm near one end thereof, magnet means associated with each pair of top and bottom rollers, each said magnet means including a pair of spaced magnet arms, means for securing one end of each magnet arm of a respective magnet means to a respective supporting arm, the other end of said magnet arms opposite said supporting arm being spaced by an air gap from said magnetizable part of each respective bottom roller, and a bearing member of a non-magnetizable material mounted between said magnet arms of each magnet means for rotatably mounting said shaft portion of each 0 said top rollers.

8. A device for loading the top rollers of a drawing mechanism as defined in claim 6, wherein said top roller includes a journal at each end thereof, and said bearing member is associated with said journal, said bearing member being slipped over a respective journal.

9. A device for loading the top rollers of a drawing mechanism for a spinning machine comprising a plurality of pairs of associated top and bottom rollers arranged separately from and behind each other in a row, at least a part of each of said bottom rollers consisting of a magnetizable material, a separate supporting arm for each of said top rollers, means for mounting said supporting arms near one end for a separate pivoting movement about a common axis, at least one magnet means associated with each pair of top and bottom rollers, each said magnet means including a pair of spaced magnet arms, means for securing one each of each magnet arm for a respective magnet means to a respective supporting arm and for adjusting said respective magnet means to different positions along the length of said supporting arm, the other ends of said magnet arms opposite said supporting arm being spaced by an air gap from said magnetizable part of said bottom roller, and a bearing member of a nonmagnetizable material mounted between said magnet arms for rotatably mounting said top roller.

10. A device for loading the top rollers of a drawing mechanism for a spinning machine comprising a plurality of pairs of associated top and bottom rollers arranged separately from and behind each other in a row, at least a part of each of said bottom rollers consisting of a magnetizable material, a separate supporting arm for each of said top rollers, means for mounting said supporting arms near one end for a separate pivoting movement about a common axis, said supporting arms being disposed one above the other and being of different lengths, means on the uppermost supporting arm adapted to engage successively with and take along the other supporting arms when said uppermost arm is pivoted upwardly, at least one magnet means associated with each pair of top and bottom rollers, each said magnet mans including a pair of spaced magnet arms, means for securing one end of each magnet arm for a respective magnet means to a respective supporting arm and for adjusting said respective magnet means to different positions along the length of said supporting arm, the other ends of said magnet arms for said respective magnet means opposite said supporting arm being spaced by an air gap from said magnetizable part of said bottom roller, and a bearing member of a nonmagnetizable material mounted between said magnet arms for rotatably mounting said top roller.

11. A device for loading the top roller of a drawing mechanism for. a spinning machine comprising a plurality" of pairs of associated top and bottom rollers arranged sep- 7 arately from and behind each other in a row, at least a part of each of said bottom rollers consisting of a magnetizable material, a common supporting tarmvf or all of said top rollers, means for pivotably mounting'said: sup- 7 porting arm near one end, magnet means associa ted with each pair of 'topand bottom rollers, each said magnet means including a pair of spaced magnet arms, means for connecting one end of each magnet arm of the respective tions, theother ends of said magnet arms for therespective 'magnetmeans opposite the supporting armv being spaced by an air gap from said magnetizable part of the associated bottom roller, a bearing member of a nont magnetizablematerial mounted between said magnet arms for rotatably mounting one of said top rollers, and means 5 for adjusting the position of said bearing memberin a direction parallel to said magnet arms.

References Cited by the Examiner :UN ITEDSTATE S PATENTS 10" 1,562,231 ell/25 Haynes 19-269 magnet means to said supporting arm and for-adjusting a V V the respective magnet means-to ditferent positions along the length of said supporting arm and for securingfsaid 'ma'gnet means to said supporting arm in the adjusted posi- FOREIGN PATENTS [1,073,359 "1 60 German I 1,092,352 11/ 0, Germany.

DONALD-W... PARKER, Primary Examiner.

Claims (1)

1. A DEVICE FOR LOADING THE TOP ROLLERS OF A DRAWING MECHANISM FOR A SPINNING MACHINE COMPRISING AT LEAST ONE PAIR OF ASSOCIATED TOP AND BOTTOM ROLLERS, AT LEAST A PART OF SAID BOTTOM ROLLER CONSISTING OF A MAGNETIZABLE MATERIAL, A SUPPORTING ARM, MEANS FOR PIVOTABLE MOUNTING SAID SUPPORTING ARM NEAR ONE END, MAGNET MEANS ASSO CIATED WITH SAID PAIR OF TOP AND BOTTOM ROLLERS, SAID MAGNET MEANS INCLUDING A PAIR OF SPACED MAGNET ARMS, MEANS FOR SECURING ONE END OF EACH MAGNET ARM OF SAID MAGNET MEAND TO SAID SUPPORTING ARM, THE OTHER END OF EACH OF SAID MAGNET ARMS OPPOSITE SAID SUPPORTING ARM BEING

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