US2663174A

US2663174A - Take-up

Info

Publication number: US2663174A
Application number: US720852A
Authority: US
Inventors: Charles C Jessen
Original assignee: Jacquard Knitting Machine Co Inc
Current assignee: Jacquard Knitting Machine Co Inc
Priority date: 1947-01-08
Filing date: 1947-01-08
Publication date: 1953-12-22
Anticipated expiration: 1970-12-22

Description

C. C. JESSEN Dec. 22, 1953 TAKE-UP 2 Sheets-Sheet 1 Filed Jan. 8, 1947 I INVENTOR C'HARAES C JESSE/V C. C. JESSEN Dec. 22, 1953 TAKE-UP 2 Sheets-Sheet 2 Filed Jan. 8, 1947 new HIIHHI" INVENTOR C'HHALES C JESSE/V Patented Dec. 22, 1953 amen-tr wTAKE JCharles JG. fJessen,

Jacquard :Knittin Philadelphia, .-Pa.,

York

Application January 8, 1 947fserial N o.720,8'52 1 3 Claims. (oases-149 I nMyimzentionrelatesfto'clothttake-ups for drawcloth from ;the;point:'of its fabrication (:whataeverrmaycbe the means ::of fabrication); ..and rmaintainingtitnnder tension at that point. The -feeddsastep byi'step,;:therstep. length being variable :nnderccontrol of and corresponding :more -01" less cto," thezrate zof-.;cloth production. Ordinarily. in itypeiof a take-aup, :successive steps 'or impulse eincrementsr 'are spassed on to the .Lrotary'jmember conmembers: of the :take-upr or that :one of those members thatispowerdriven. The series of steps 3'01 :jerks 1 120 whiz'zhrthecloth sis thus subjected is objection'al :in some instances; for "example in swazp sknittingzmachines .it tends to "cause ob- .ijectionable-zstreaking of;1the' cloth.

:rMyzinventionitends 150 {obviate :this effect :by tinterposirigabetween ;a rotary .member pulling stherclothaand sthe step I by l-step. :drawing r mechaxnismewhich*rotates :.thisztakeeup "m ember, vmechamism s,to;receive: and zstoreeenergy'. ofztherrotation- ,iproducing impulsesa -and ltransfer.-'suchzenergy :to tithe ;:rotary taker-cup member at,-.-at least, a more snearlt tconstantrate. This reducesathe-variations inazithe momentary speed .of rotation of the takeiup; ;;that..is;to "say, thoseivariations caused byza zstep; bytstep snatureaof the driving mechanism as vl'd-istinguished ;from :thOSG long rangevariations i mcspeeid to WhichFthe take-up may be subjected 'fhyrreasonxofc or;to compensate for, say, :the "acmumulation rot-,cloth on; a (beam, .AS'f-Will :more

ifiillyvappear in .the :detailed description, ;.the zenergyweceiving: and; storing mechanism-spreads ntheiincrements over greater .timecintervals, thus minimizing acr softening them and tending :to

ieliminateior render negligible'j'the-otherwise: ob- :2

iiectionablegierks on: the cloth.

' @Referring to the ,drawings in which "is illus- -tvatedan "otherwise known type of; cloth: take-Yup mowwhich: my iinventionhas been-applied and in which; it: is exemplified:

. ;:F ig. :1 .is -:an-: endvelcvation, partly in vertical =section,-nof the: clothewinding, mechanism;

Fig. 2 is a plan -=view of the-'samemechanism, lparts ibeingibrokeni away and in section and .rEfig. '3 is-.a"representativeshowingof theropi f xrationuand-also ahshowing of the-ideally pree' ferredtoperation.

-..In. the 'device illustrated .the :cloth :take-up :mechanism includesarstepaby step drive,;a step- .ilengthznontrol' responsive-to differences between 2the-.-.-rate)of; cloth= production and the rate ;of =wind- .inge-theacloth r on the -,beam,= and spring :means .modifyingesaid drivexbeforel its application to the iclflthi .-.beam. This .-tmechan-ism,- including cloth heamq l'wvith; itSi shaft extensions :32, 3 ,i'i'szassembled non ibracket'plates g4, "10f; the :main iframeysthe Q :clcithrbeam may be 'carried demountablmssayfin :some: customar-y manner. zRatchetwheeli-mizfixed ":to :stubarshaft' 1" which: is i-rotatablel-in"bearingscin plate 4,:iis driven byzpawltiizl'iinged-at lflionipawl rcarrier 39 which "is mounted *for OSC'iIIatiOH-IOZI :rshaft '1;fthe pawlfis urged about pinzlfl of :ca'rrier {by-spring --l: I winto :-idriving:"relationi'zwith the "ratchet *teeth. power rshaft 1-2, day: gears I-3, l i,--:wrist pin 1'5 and connecting rodalcfi to pm I 1 throughtherknuckle of time rearrier, vi'oscilla-tes -the pawlscarrier and fits pawl-8 constantly. Holding means, as the pawl 18; urgedeabout ..s=leeved pin -l-9 "projecting x inward sifromthe :plate -4=:;by

" spring "Zn-into sholdingzcontact withithe matchet,

;prevents reverse :movement. iGearJZI :fiXBd-"JCO I shaft 1 "and :meshing with= geara22 looseron {cloth beam shaft 2, impartstotthe "latterggearztherstep 'by-tstep rdriving impulses developed "by rthe pawl sand ratchet, and the energy of whichsiin a:ma nner -hereinafterrexplained,:is'=modifiedrand v-itrans- *ferred to themloth beamxitself.

L- The control .cmeans: for :altering ithe wefiecti-ve thrownof the pawl toginsure due co-ordination with the :i-rate fOf icloth production, :may 'zbe :the

rknown1mechanism. illustrated. 'In'" this jdeviceia .hub :23, free foraoscillat-ion;o1r-shaft= 1;; hast arradial extension from whichra shield 7-24: projects slaterany .0 ver the. :teeth' :of :the :ratchet 6, and {to z a :var-iable extent %between :them :and the path ==;.of the pawl 8. '1 This: shield-covers :va 'greater: or; less number of teethidepending on-its rangu-lakpflsition. -,It 'zthus determines theefiective throw cf lipawl -18. The 1 angular'r'lccation "of the shield E is determined :and variedeby the position Bic-the dancer, r0114! which; isrtrunnioned iinarmsrzii z'l ffixed -to shaft 1 28 and from which arms weights .29 'may I be :hung h as indicated. A thirdl'arm :30 -fixed -to-vshaft ..28 has :lugs 2 3| "and -32 coacting with stop pin. 3.3 .to limit= the: range ofimctionrin extreme cases. :Armi 2-6 terminates in gean segmentf3 Ameshingwitlr gean segment 3 5 onhubllii .of .theishield ,24. The dancer .rollv. rests m and tisususpended, bya. ,bight. of .theclothibetween. the point of, cloth fabrication f and the beamll in the present instance'in a bight. between the ..point, of fabrication f and the idlerroller "36"provide'dto direct the cloth "to the beam-along a desired path. The-weight of "the dancer --roll 25, plus any weights at 29, determines the tension of-the cloth at the fabricaitiompoint f; by adding tor subtracting weights :at $29, this atension can the ichanged at swill. Wheneverezthe zaveragerperiph- ;era1=speedwf:the roll:gbfcclothson: beam-Tl exceeds 55 the rate-of, cloth production vat'1;thecbighteshortshown, and bolts 43 with nuts pulses of the Speaking ens and raises the dancer roll 25, and this moves shield 24 to cover more ratchet teeth from the pawl so that the effective throw of the pawl is shortened, thus reducing the rate of cloth windup on the beam. Contrari-wise, whenever the wind-up or average peripheral speed of the cloth roll becomes less than the rate of fabric production, the dancer roll falls and shifts the shield to uncover more teeth to pawl action, the effective throw of the pawl is lengthened and the wind-up rate is increased. Over considerable periods of time therefore the rate of winding of the cloth on the beam is equalized to the rate of cloth production. The real throw of the pawl, both forward and back, remains unchanged, of

course.

To modify and transfer the (initially step by step) drive to the beam itself, at least two spaced opposed abutments 31, 38 (and preferably two or more such pairs in substantially equiangular placements about an axis in the drive, e. g. about the beam axis) are provided. The abutment or abutments 31 are fixed to a step by step driven member; in the present instance the gear 22 or to a plate 39 attached to this gear. The abutment or abutments 38 ar attached to the cloth beam l in a manner to rotate the beam; for example to more or less radially extending arms 40, M keyed to the cloth beam shaft 2. A spring 42 is provided between the abutments of each pair to transfer the driving energy from 31 to 38. Each spring may be seated in recessed faces as 44 and lock nuts 45 may be used to anchor the springs in place, to prevent undue separation of each abutment 38 from its companion abutment 31 by the thrust of the spring or springs or otherwise, and to tension the springs if desired.

The tension under which the spring or springs 42 are held by the bolt or bolts 43 is such that any advance of the abutment or abutments 31 enables the spring or springs to turn the beam l (in a direction to wind on further cloth). Or

they may be so constructed that a few "preliminary step advances by the abutment or abut- I ments 31 will, and are needed to, compress the spring or springs sufliciently to move the beam. Further, the spring or springs 42 are so made (i. e. have such characteristics) that once a step advance of an abutment or abutments 31 causes or permits the spring or springs 42 to turn the beam, the spring or springs continue to turn the beam for a time after that advance of 31 ceases; namely, for such a time thereafter that the total period during which the beam turns, consequent on that advance of the abutment or abutments 31, is greater than the period during which the latter abutment or abutments 31 make the respective advance. Consequently the instantaneous speed of the beam is, as it were, always less than the speed of the abutment or abutments 31 while the latter are in motion, and the spring or springs 42, by absorbing energy from th abutment or abutments 31 rapidly, and applying this energy to the beam more slowly, transforms the jerky relatively high-speed-short-period driving impawl 8 and abutment or abutments 31, into relatively low-speed-long-continued, and accordingly smoother, turnings of the beam. generally, the longer the spring or springs 42 keep the drum turning after each advance by the abutment or abutments 31, the better. Preferably springs 42 are used which have such characteristics that once started the turning of the beam does not stop so long as power is supplied to the pawl.

The ideal of this latter action, after the takeup mechanism has reached a condition of stable operation, is illustrated in the diagram of Fig. 3. In this diagram time is measured from a to g, and the diagram indicates, by their displacements from the line a to 9, positions of two abutments 31 and 38 of a pair at the ends of successive periods during three consecutive cycles of the operations. It shows also the action of a spring 42 between such abutments. At time a the pawl 8 begins an effective stroke and accordingly the abutment 3'! begins to advance. During the interval a to b, the abutment 3T advances to its position at b and, the pawl 8 having reached the end of its effective stroke, comes to rest. In making this advance the abutment 31 increases the compression of its spring 42. Also during this interval a to b the compression in spring 42 advances its abutment 38 from its position at a to its position at b, and accordingly turns the beam l a corresponding distance. While abutment 31 comes to rest at time b, the energy stored in spring 42 at this time, in the form of compression, continues the advance of the abutment 38 and the turning of the cloth beam l, and this advance and turning continues to the time 1: when the pawl 8 begins its next effective stroke and accordingly when the abutment 31 starts to advance the next step; preferably the compression in 4! is such (and its limiting bolt 43 is of such length) that the spring is capable of continuing to advance the abutment 38 somewhat beyond the time 0 even if abutment 31 should not advance again; this prevents the beam stopping even momentarily at time c and at corresponding times in other cycles. At time c therefore the cycle is completed and another begins, the abutment 31 now advancing another step during the interval 0 to d (a step like that taken in the interval a to b if the dancer roll 25 has not moved up or down and thereby changed the length of the effective stroke of the pawl 8) and then again coming to rest, and the spring 42 advancing the abutment 33 and turning the beam I from time c to time e. This completes a second cycle, and the subsequent cycles will be like these two described except as the rising and falling of the dancer roll 25 may lengthen and shorten the effective strokes of the pawl 8, and accordingly lengthen or shorten such periods of time as a to b and c to d, and correspondingly change the extent of the abutment movements and thereby the rate of turning of the cloth beam. The slope of the broken lin drawn through the various positions of the abutment 38 in Fig. 3 indicates the momentary average speed of advance of this abutment and the average peripheral speed of the roll of cloth on the beam, and also that I prefer to rotate the roll of cloth constantly, and at a constant peripheral speed, so far as it is reasonably possible to approximate these.

As before indicated however, Fig. 3, as described above, illustrates the ideal mode of operation with my invention, or that mode of operation which ordinarily I approach so far as may be reasonably convenient, in any instance, or so far as may be necessary to eliminate or to reduce to a desired extent the irregularities in the cloth that otherwise may occur because of the step by step driving action of the pawl 8. In other words, my invention is not limited to this described operation. For example, instead of the abutment or abutments 38 moving momentarily at a uniform speed as suggested in Fig. 3, such a spring or springs 42 may be used that the speed of the abutment or abutments 38 is relatively low at time c, then increases more or less gradually to about time d, and then fall again, more or less gradually, to time c, and this speed vary similarly during the other cycles. As another example, such a spring or springs 42 may be used that the abutment or abutments 38 come to rest somewhere between time b andtime c, and start again somewhere between time c and time cl, and similarly move intermittently during the other cycles; in any such case Where the length of each period of movement of the abutment or abutments 38 exceeds the length of the preceding period of movement .of'the abutment or abutments 3'! (e. g. exceeds the period from c to d), some of the advantages of the invention are achieved. The maximum advantage of the invention is achieved when the momentary speed of the abutment or abutments 38 is constantthat is to say, is uniform except as it may need to vary, slowly, to compensate for the growth of the diameter of the roll of cloth on the beam I as more and more cloth is wound on it.

In general it will be understood that my invention is not limited to the details of construction and operation described above and shown in the drawings except as appears hereafter in the claims.

I claim:

1. A cloth take-up including power driven step by step driving mechanism, a cloth beam, at least one pair cf abutments disposed in substantially the same plane and revolvable around an axis substantially at right angles to 'said plane, of which pair one abutment is connected to said beam to rotate the beam and the other abutment is connected to said driving mechanism to be driven, step by step, by said mechanism, and a spring interposed between the abutments of each pair to receive and store energy of the beamrotating impulses of the step by step driving mechanism and transfer such energy to the cloth beam.

2. The subject matter of claim 1, characterized by the fact that a plurality of pairs of said abutments, with interposed springs, are provided, and said pairs are distributed substantially equiangularly about an axis of the driving mechanism.

3. In a cloth take-up, a cloth beam, a pawl and ratchet mechanism to drive the beam, at least two abutments distributed substantially equiangularly about the axis of the cloth beam, means through which said pawl and ratchet mechanism can rotate said abutments around said axis, a corresponding number of cooperating abutments fixed to and around the axis of said beam, and a spring between the members of each pair of said abutments to transmit motion of the first of said abutments to the beam.

CHARLES C. JESSEN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 582,452 Brewin May 11, 1897 1,624,373 Stroud et a1 Apr. 12, 1927 2,014,114 Muller Sept. 10, 1935 2,140,366 Lieberknecht Dec. 13, 1938 2,174,271 Lawson et al Sept. 26, 1939 2,185,963 Lambach- Jan. 2, 1940 2,275,874 Weisler et al Mar. 10, 1942 2,366,462 Sirmay Jan. 2, 1945