US2659539A - Thread guiding device - Google Patents

Description

Nov. 17, 1953 o. STENGLEIN THREAD GUIDING DEVICE Filed Oct. 8, 1952 /N VEN TOR: O5 wALD STEHGLE/d By I ?atented Nov. 17, i953 UNITED STATES THREAD GUIDING DEVICE Application October 8, 1952, Serial No. 313,766

Claims priority, application Germany October 11, 1951 Claims.

This invention relates to a thread guiding device of a machine for winding cross-wind spools.

A machine for winding cross-wind spools 1s known which has a thread guiding device with a thread guide moved to and fro parallel to the axis of the spool by means of a slider-crank drive, means being provided for periodically displacing the crankshaft in order to guide the thread accurately at the points of reversal of the thread guide so as to overcome in an accelerated manner the dead point positions of the slider crank drive. In this known machine the crankshaft of the slider crank drive is displaced by means of an arm in which this crankshaft is journalled, the arm being rotatable about an axis at right angles to th axis of the spool and being moved to and fro about its mean position by means of a control lever. rEhe control lever carries a cam follower which projects into a groove in a discshaped rotating driving member. This groove is endess and consists of two arcuate grooves of different radii concentric to the axis of rotation, and two transitional grooved portions which join the two arcuate grooves and are so constructed and regulated that during continuous rotation of the driving member the crankshaft of the slider crank drive is caused to overcome the dead point positions in an accelerated manner, in that shortly before each dead point position is reached, the said cam follower of the control lever is caused to pass in the course of a short path from one arcuate groove through one of the transitional groove portions into the other arcuate groove.

This method of displacing the crankshaft of the slider crank drive is associated with disadvantages in as much as the cranmhaft describes an arc during its periodical displacement because it is journalled in the said arm, Consequently in the middle part of the spool the thread guide is displaced to one side of the median plane of the spool lying at right angles to the axis of the spool, so that the lay of the thread is displaced correspondingly at this place and the spool is wound to one side at this place. Moreover the positive movement of the cam follower of the control lever from one arcuate groove to the other through the transitional groove portion, which is effected in the course of a short path, when the driving member is running fast, leads to a reverse movement of the control lever linkage including the arm which is associated with a shock effect which is the greater the more rapidly the driving member rotates. Apart from the acoustic disagreeableness of this shock effect arising at a 2 high speed of rotation, the eect also leads to the danger of breakage of the control parts. For these reasons this known thread guiding device cannot exceed a certain critical working speed which lies below the working speed which would be permissible having regard to the strength of the thread to be spooled.

It is an object of the invention to overcome these disadvantages of the above mentioned known thread guiding device by achieving a displacement of the crankshaft, which takes place in the said median plane of the spool and is not associated with a shock effect upon the control members, but nevertheless ensures the desired accelerated displacement of the crankshaft in the region of the dead point positions of the slider crank drive to a degree suicient to ensure accurate guiding of the thread at the ends of the spool. The invention consists in that the crankshaft of the slider crank drive is guided to slide in a straight line in the median plane of the spool and is controlled by a crank and connecting rod drive with a stationary crankshaft, the crank of which is coupled through a coupling pin with the crank of a further crank and connecting rod drive with a stationary crankshaft, the connecting rod of which is linked eccentrically to a rotating driving member, while the said coupling pin is rigidly connected to one of the two cranks and is guided to slide with respect to the other crank in the longitudinal direction of the arm thereof.

The accompanying drawing shows an embodiment by way of example of the construction of the invention.

Figure 1 shows an elevation of the thread guiding device partly in section and in vertical median longitudinal section on the line A-A of Figure 2, which shows a plan View.

A base plate l is provided with a screwed hole into which the screwed end 2 of an axis pin 3 is tightly screwed. A worm wheel i rotates freely on the axis pin 3. The worm wheel li is provided on its lower side with an eccentric drive 5 and meshes with a worin 6, the shaft 'l of which is connected in a manner not shown with the drive of a cross-wind machine which drives a spindle 8 on which is mounted the cross-wind spool 9 on which the thread is to be laid. The thread of the cross-wind machine, the rest of which is not shown, runs in manner known per se through the fork of a thread guide le which is secured by means of screws il to a slide l2. The slide l2 is arranged between two stationary guide rails i3, the mutually facing sides of which are each provided with a longitudinal groove I4, in which the slide I2 is mounted to slide to and fro parallel to the axis of the spindle 8 of the spool. The slide l2 is also provided with a parallel sided guidewayl extendingtransiclely vof the spindle 8 of the-spool. -In the mean positionofthe slide l2 shown in the drawing the vertical longitudinal median plane of the guideway I lies in the transverse median plane of the spool. A slider IS-is guided to slide longitudinally in this 'guideway I5. The crank pin I'I of a driven crank I8 is journalled for rotation in "the slider I6. fThe crankshaft I9 of this crankjis journalled 'torotate in a, second slide 20 which is guided to slide to and fro between two rails 2| extending parallel to the said median plane ofthe spool. 'For this 1 purpose the two rails 2l are each provided `on their mutually facing sides with a'longitudinal groove 22 in which the slide 20 engages.

The lower end of the crankshaft I9isfconnected with a driving crank 23 the crank pin 24.of which is journalledin ausliderrZe which-is `fuided .to slide in .aradial `parallel .sided l. guide- .wayin the vworm wheel l which serves as the .driving vmember for .the crank. The crankshaft 1,9.,is rigidly-,connected Vto the cranks .I8 and ,23 byaneans of pinsZI'I, 28 whichl pass through-them.

The slide 20 is connectedbyga pin VL10-tothe .connecting rod 3 0 .ofv Ia crank and connecting rod ,drive,. the crank 3I- of whichis mounted forrotationabout la. stationary vcrankshaft ,32. ,The .crankshaft 32 `:is mounted -ona lever 33 .which ,is set von vthe spigot-,shaped Aupper end 34 of a .column `:l5 mounted on the base plate l Aandis :prevented by a key 36from. rotating withrespect to this spigot 34.

The base plate `I also Vcarries a screwed hole ,into which .is screwed Va Vcorresponding screwed spigot portion 31 of the crankshaft j-38 of a f ur- .ther crank .and connecting rod drive, Athe crank 13 9 of which carries a crank pin .4I which lis .simultaneously constructed as a lcoupling pin Vlill to which one end of the connecting rod construcved as an. eccentric. rod .42 is connected, whilst the otherend of ,this `rod constructed :as aneccentric strap.43,.is journalled about the above mentioned .eccentric vdisc 5 of the worm .wheel4. .Thecou- .pling .pin .40 mountedvon the crank 3,9 engages .in amedian ,longitudinal slot A4.1i provided .in the arm of rthe crank V3I, thecouplingpin 4D -being guided vto slide longitudinally in this crank 31. 45 indicates the crank pin of the crank V3| to which the connecting rod is connected. Vl`The .eccentricity of the eccentric drive, 43 -is indicated by e. In the position shown Yingthe Adrawing Vthe threadguide-.Im as already mentioned, is

in itsmean Aposition withrespect to the spool 9 -and the eccentric lis .approximately in Ythe extreme right-hand position. In vthis position the crank pin 4I whichis connected to A the-eccentric `rod 42, is spacedby the .distance e of `the eccen- 4vtricity ,of the eccentric from the longitudinal median plane p passing .through the mutually parallel stationary crankshafts .of thev two crank andconnectine Yrod drives.

In `,operation Ythe worm .drives the worm ,wheel 4 and Vconsequently the eccentric disc ,5 Acontinuously in the direction vof the arrow 45 shown in Figure ,2. This rotation is transmitted 'to the crank pin24 so that the crank 23 rotates in the same direction whilst the slider ,25slides in the radial guideway 2,6 in accordance with the spacing between the centre lines of the crank- A'shafts 3 and i9. This spacing in the position *shown is equal in magnitude to the eccentricity -e. The crank 23 transmits its rotation through the crankshaft I9 to the driven crank I8. The crank I8 forms with the slide I2 a slidercrank drive and thus sets the slide I2 in to and ,fromotionparallel to the spindle ofthe spool, 5 `while the Yslider I6 inwhich the crankjpin I1 of the crank I8 is journalled, slides correspondingly to and fro in the guideway I5. The thread guide necessarily participates in the motion of .atheslide 1 2 and consequently lays the thread on l0 the spool 9.

During vthe roperation of the device the slide 20carryi-ng the crankshaft I9 is moved longitudinally ,of the `guide rails 2| because of the stroke of the eccentric rod 42. Starting from the eXtreme-right-hand position shown in the drawing .this motion initially is only very slow, be- -causethe coupling pin 40 mounted on the crank 39 slides in the longitudinal slot 44 when the crankl begins to move, so that at the beginning of this movement this crank 3| rocks only A.relativen/slowly. 4In Athe course of .thismotion athecoupling :Dinll approaches the stationary crankshaft `22 so that the transmissionratio of the lever 43l increases. When however the 4ec- -25 centric ldisc 5 is turned through'approximately `90'in'thedirection ofthe arrow, the crank rocks ata-correspondingly.accelerated speed about the stationary. crankshaft 32. The construction v and Vvarrangement of the cranks 3| Yand 39are so selected that when the above Ymentioned 90 ro- :tation has been performed, theaxis `of vthe couplingpin 40 lies in the plane@ in such a way 4that in -this 'position the maximum .accelerating vmotion is transmitted ,by the `two crank and connectingrod drives,.42, 39e- nd 30, 3| to the `slide 20. In this position of 90 rotation lthe threadguide I0 is disposed exactly atone ofvits two points of reversal. The slider crank drive I8, VI2 is Vdisposed in the corresponding dead point position. Since, however, the crankshaft I9 is displaced with maximum acceleration through .the mean position, thus overcoming this dead point position, the `necessary requirements for accurate guiding-of the thread at theends of the spool .are fullled, i. e. the dead --point position is overcome with maximum acceleration, so that the velocityzwith which the thread guide moves is checked yas little r.as p ossible at the* points of reversal, Without however 4the need for va hammerlikereversal of the l,motion of thecrankshaft I9 `of the slider-crank drive. On ,the contrary .the crankshaft is displaced lmore steadily by means of the two crank and connecting rod drives 39, 3l and 30, 42 coupled together as described above, the motion -of acceleration being relatively small .in the mean position of the .thread .guide Ill, but relatively great in the region of .the points of reversal of the thread guideltl.

From thesymmetrical relationship shown with respect to the ,drawing .it vfollows that as the eccentric .disc v5 rotates further between 90 and 180 vthe reverse operation takes place as regards the-displacement of thc two `-slidesll and ,65 I.3, ,sothat on reaching 180 rotation, the two Ycrank and connecting `rod drives 30, 3|.and 39, 42/have reached their opposite extreme positions, in .which the cranks 3| and 39 lie in a position symmetrically opposite with respect to the plane ,70 p of the right-hand extreme position shown in the drawing.

'I n principle on .furtherrotation of the eccentric disc 5 between 180 and 360 the same operations Aagain take place as those on rotation A A.between .0 and 90, save only that the thread guide I moves in the reverse direction to that in which it reached the second point of reversal. In this case also the crank 3| moves slowly at the beginning of its movement and has an accelerated motion at the end of its movement because of the said symmetrical position of the crank 3|.

I claim:

l, In a thread guiding device of a machine for winding cross-wind spools, a slide carrying the thread guide, said slide being guided in guides to slide to and fro parallel to the axis of the spool, a driven crank rotating about its crankshaft, a crank pin on said driven crank being guided to slide transversely of the axis of the spool in a guideway in said slide, two crank and connecting rod drives with stationary crankshafts, the said crankshaft of the driven crank being articulately connected to the connecting rod of one of the said crank and connecting rod drives, the connecting rod of the other crank and connecting rod drive being linked eccentrically to a rotating driving member, the two cranks of the said crank and connecting rod drives being coupled together by means of a coupling pin, said coupling pin being rigidly connected to one of said cranks and being guided to slide with respect to the other crank in the longitudinal direction of the arm thereof, said two cranks being so arranged and constructed that the connecting rod of the first mentioned crank and connecting rod drive imparts to the said crank,-l

6 shaft in the transverse guideway in the said slide accelerated motionto overcome the dead point positions at the two points of reversal of the thread guide.

2. In a thread guiding device according to claim 1, the connecting rod of the second mentioned crank and connecting rod drive being constructed as an eccentric rod and being journalled about an eccentric disc of the said driving member.

3. In a thread guiding device according to claim 1, said driving member being provided with a crank pin guided to slide radially and said crank pin being mounted on a driving crank set on the said crankshaft.

4. In a thread guiding device according to claim 1, said crankshaft carrying a driving crank and being journalled in a slide, which slide is guided to slide transversely of the axis of the spool between the arms of said driving and driven cranks.

5. In a, thread guiding device according to claim 1, said crankshaft of the driven crank being journalled in a second slide, said slide being articulatedly connected to the connecting rod of the first mentioned crank and connecting rod drive and being guided to slide between two stationary rails extending parallel to the transverse median plane of the said spools.

OSWALD STENGLEIN.

No references cited,

Images