US2735257A

US2735257A - legard

Info

Publication number: US2735257A
Authority: US
Publication date: 1956-02-21
Anticipated expiration: 1973-02-21

Description

Feb. 21, 1956 R. H. LEGARD, JR, ET AL WINDING AND TWISTING Filed Sept. 24, 1954 INVENTORS P05597- 19. 456490 J/a Y 54/? 1Q NEAaowS United States Patent" 6) WlNDINGlA'ND 'I WI S'TING e ward. ra -n aaws Pear sliilrg, .VaLgas'sIgH rs to fCelai ese Corporahon of America, New. Yiirk', N. Y a cbrporation' of Delaware Appliafibl'l septmb'ei' 24,! .1954; Serial N$458076 rota-iii; (Cl. 57: 9.3

This inventionvrelates towir'rd-ing and twisting and relates more particularly to apparatus for winding and twisting 3 filamentar'y nrat erial to fonn a paekage offilanientary material having substantially uniform twist throughoutits-lengt-h;

It*i s' an* objct or this invention 'to provide; novel wind ing and twisting apparatus in which" filamentary mate; rial is 'wou'n'd 'into a package and twisted in "suchfa manner that the degree of twist is substantially uniform throughout said packager Other objects'of'this invention, togetherfwith certain details of construction and combinations of parts, will be apparent from the following detailed description and claim.

In the' accompanyingdrawingwherein' a preferreWembodiment of this iIlVHfiQQflSfShQWlI Fig. 1 is a view in perspective of the general arrangement of the-app aratus; and

Fig. 2 is a view in perspective of the speed-varying mechanism employed in the apparatus of this invention.

Like reference numerals refer to like parts throughout both views of the drawing.

Referring now to the drawing, and in particular to Fig. 1 thereof, reference numeral 11 designates a supply bobbin wound with yarn 12 to be twisted. While two supply bobbins are shown in the drawing, the descriptions will be limited to one since both bobbins are operated by similar elements. The bobbin 11 is mounted on and rotated by a rotatable vertical spindle 13 which is driven by the engagement of a travelling belt 14 with a whorl 16 formed on said spindle, the belt 14 being in turn driven by a motor 17 through a driving pulley 18. The yarn is drawn off the end of the bobbin 11 through a fixed guide 19 positioned at a point above the spindle 13 and then passes over a plate 21 and through a ceramic button guide 22, movably supported on said plate 21, to a driven yarn package support, such as a conical or cylindrical tube, on which its is taken up in the form of a yarn package 23. The button guide 22 is moved by any suitable traversing mechanism to and fro along the length of the yarn package 23 in order to form said package in the desired Winding pattern.

During its passage between the revolving supply bobbin 11 and the button guide 22 the yarn 12 becomes twisted, the extent of the twist, as measured in turns per inch, depending completely on the relation between the rotational speed of the driven supply bobbin 11 and the linear speed of the yarn 12. The linear speed of the yarn itself is a function of the rotational speed of the yarn package 23 and the diameter of said yarn package at the point where the yarn is being wound. Accordingly, if the package 23 were rotated at a constant rotational speed the linear speed of the yarn 12 would increase as the yarn built up on the package. If at the same time the rotational speed of the bobbin 11 were kept constant, the degree of twist on the yarn, as measured in turns per inch, would decrease as the winding of the yarn on the cone progressed.

The apparatus of this invention includes an arrange- 2,735,257 Fr eware-.2 19,5

is" mounted; therbett 24 being? driven through :apositive infinitely variable transmission; generally indicated; by refe'rence num'eral2 28, havingiparallel input- I? and output shaftss liand i32,-: respective1yi- The out ut shaft 32 serves 1 to drive the: belt 724*while the input '1 shaft 311 is rotated? either by the motor 17 which drivesibobbin llior' by 'any other :suitable prime mover whose-speed isi inaintainedlat a zvaliie whi'c'hiibears': a constant t ratio *tothe speed' of said:

The positive infinitely variable transmissioh ltli com prises (Fig. .2) a pair o ii lp ulleys 33" haviiig opposed' g nerally conical grooved faces 34 and mountedfionthe outp11t1shaft132iandfalpair of simitarpuIleys SB n'iou'n" on thesinputtshaft 3:1 The-shafts fl and 32' are spl'i'ned 'as at 37 so" thatthe pulleys 0f *ea'ch pat'r' can: be moved close'r togetheror tartlreriapart: The shatts 'sl and SZ -ai-e kine mati'cally connected; through the: pulleys 33: and 36,? by anfendl'essobelfiias havingftd'o thed edges "39, with the teeth of .the'ibeltofiten ga'gin in the grooves 'of'theconical Et'aces e apparent thatit. d axially closer r together while the .1 3'6 rare mbved'raxially further apart the toothed 3 ill ngag'e the pulleys -3'6 a a po t 'clos'er to' tlie axisrofi'th rinpi'ittsh ft"31':a 'l-erigage the pulleys 33; at .a -lpointi' fuitheri from e akis t the outpnt shaft -SZ;

pnll'eys'23'3 are move pulle therebv-deereas pnnshatitzahdizthecspeed of ithe input shialit. These axial nrdive'ments'roli the:pulleys 33rand' 36 ate. efiected byit'ie'aiis of

levers

41, 42 mounted along the sides of said pulleys. Each

lever

41, 42 is in the form of a pair of

members

43, 44, one below and one above the

shafts

31 and 32, said

members

43, 44 being connected by pins 46. Each lever is pivoted on a vertical axis 47 between the

shafts

31 and 32 and is connected to

pulleys

33 and 36 at opposite sides of said pivotal axis 47.

The positions of the

levers

41, 42 are controlled by a pair of aligned

rods

48, 49, respectively. One end of each rod is connected to the end of one of the levers by

pins

51, 52, while the opposite end (Fig. 1) of each

rod

48, 49 abuts against the surface of one of a pair of

rotary cams

53, 54. The

rods

48, 49 are urged apart and pressed against the

cams

53, 54, respectively, by a spring 56 (Fig. 2) mounted between the

pins

51, 52. The

cams

53, 54 are driven at equal speeds, through an arrangement of shafts, pulleys and gearing, which arrangement is designated generally by reference numeral 57, by the motor 17, the arrangement being such that each

cam

53, 54 makes one complete revolution during the period of time necessary to wind the package 23 fully. It will be appreciated, of course, that the

cams

53, 54 may be driven by any other prime mover whose speed is constantly proportional to that of the motor 17. For example, when the speed of the motor 17 is constant the cams may be driven by any suitable timing arrangement.

The constructions of the

cams

53, 54 and their directions of rotation are such that the

rods

48, 49 are forced most closely towards each other by said cams at the beginning of the winding of the package 23. As the winding progresses the cams permit the

rods

48, 49 to spread further apart in response to the urging of the spring 56, and thus cause the rotational speed of the package 23, relative to the speed of the bobbin 11, to decrease until the package 23 has been fully wound, at which time the cams have completed one cycle of revolution and the

rods

48, 49 are again forced closely together by said sams and the fully wound yarn package 23 is replaced by an empty yarn package support, e. g. a conical or cylindrical tube. The replacement of the fully wound yarn package by an empty i the yarn-"12 thereon proceeds) More yarn package support is efiected by the operator of the machine or by any suitable automatic arrangement.

As indicated in the drawing and mentioned above the device of this invention will generally contain a plurality of spindles 13, all driven at the same speed from a common motor 17, and a plurality of packages 23, which may be conical or cylindrical or both, all driven at the same speed from the output shaft 32. In this case all the yarn packages should be defied and donned at the same time. During the period when all the packages are dotted and donned the rotation of the

earns

53, 54 should be stopped in order to insure that the cams will be at the proper point when winding begins again.

It is'to be understood that the foregoing detailed description is merely given by way of illustration and that many variations may be made therein without departing from the spirit of our invention.

Having described our invention, what we desire to secure by Letters Patent is:

Apparatus for the twisting and winding of filamentary material comprising a spindle for holding and rotating a wound package of filamentary material, means for driving said spindle, a mounting for holding and rotating a support for a second package of filamentary material to wind the filamentary material from said first package onto said second package, means for driving said mounting, a guide positioned axially of said spindle for receiving the filamentary material being unwound from said first package, the construction and arrangement being such that said yarn becomes twisted as it passes from said first packageto said second package, means for varying the relative speeds of said two driving means so as to decrease the speed of said mounting driving means relative to the speed of said spindle driving means as the diameter of said second package increases due to the winding of filamentary material thereon, said varying means comprising an input shaft driven at a speed proportional to the of said levers being operatively connected to one of each of said pairs of pulleys for varying the spacing of said pulleys so as to vary the ratioof the speeds of said input and output shafts, a spring acting on said levers and urg ing said levers in a direction to increase the ratio of the speeds of said input and output shafts, a pair of rods each connected to one of said levers, a pair of rotatable cams having surfaces engaged by said rods for operating said levers through said rods, the surfaces of said cams being so constructed as to effect, by their operation of said levers, an increase in the ratio of the speeds of said input and output shafts during the time necessary to wind said second package fully, and means for driving said cams at a speed proportional to the speed of said spindleand. at a rate such that the desired increase in the ratio of the speeds of said input and output shafts is efiected during each cycle of complete winding of said second package.

References Cited in the file of this patent UNITED STATES PATENTS Italy Mar. 31, 1936