US1549026A - Presser-foot mechanism for sewing machines - Google Patents

Description

PRESSER FOOT MECHANISM F'OR SEWING MACHINES Original Filed March 6, 1922 2 Sheets-Sheet- 1 1h 107 Mw 5 1,3%4M04 Aug. 11,1925. 1,549,026

W. PEARSQN Y PRESSER FOOT MECHANISM FOR SEWNG MACHINES Original Filed March 6, 1922 2 Sheets-Sheet 2 Patented Aug.. 11, 1925.

PATENT QFFICE.

WALTER PEAR-SON, F "WHITMAN, MASSACHUSETTS.

PRESSER-FOT Vlll'LECJHrhTISldlIlEOll, SEWING IVIACHINES.

Original application filed March 6, 1992, Serial No. 541,494. Divided and this application filed May 24,

y. y y 1923.

To all whom may Concern.'

be it known that l, liilAL'rnn PininsoN, a

citizen of the llnitcd Stat-es ol America, andv nisn'n; therefor, the object of the invention being to provide a mechanism of this character which will be effective in operation and which will be automatically regulated in accordance with the various thicknesses of the work being` operated upon.

The invention consists in certain novel features of construction and arrangement of parts which will he understood readily by the description of the drawings and to the claims to be hereinafter given.

For the purpose of illustrating the invention, one preferred form thereof is shown in the drawings, this form having` been -found to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized, and that the invention is not limited to the precise arrangement and or- Iojanization of the instrumentalities as herein shown and described, except as required by the scope of the appended claims,

(lf the drawings.:

Figure 1 represents a side elevation of a sewing;` machine embodyingu the principles of the present invention, the casing* cover bein o; shown removed. e

Figure 2 represents a vertical section of a. portion of the front of the machine.

lfigijure 8 represents a horizontal section of same on line 8, 3 on lfig. 1.

Figure 4 represents a transverse vertical section of saine on line 4, 4 on F 1, and

Figure 5 represents a front elevation of a portion of the. machine.

Similar character indicate like parts throughout the several figures of the 'draw 9 ings.

ln the drawings, 88 is a casing for a sewing` machine such as is shown and dQSClflle/d.

Serial Na/11,243.

in another application of mine of which this application is a division, said parent application having` been filed March 6, 1922, and numbered 541,494.

ln suitable bearings in the casing 88 is mounted a revoluble driving shaft 42 adapted to be ldriven bythe pulley 41 when frictionally connected to the hand wheel 48 secured to the outer end of said shaft 42.

rEhe inner end of said shaft 42 has secured thereto la cainmember 47X which is provided with a peripheral cam path 48 in which is positioned a roller 98 revolubly mounted on the upper end of the lever 97 secured to an oscillating shaft 96.

Fixedly secured in the casing 38 is a stud G7 having` loosely mounted thereon the hub 68 ofa lever 89, the front end of which is pivotally connected to a link 70, the lower end of which is pivotally connected to a collar 71 secured to the presser foot bar 72.V

rlhe hub G8 is threaded and has threaded thereto the nut 73 having a plurality of depressions inv oneface by which it may be adjusted on said hulo. i

This nut 78 is` cylindrical and is surrounded by the split hub 74 of an arm 75, the outer end of which is connected by a spring 75 to an arm 7GX pivotally mounted on a short shaft 77 adapted to oscillate in a bearingV in an arm 78 pivoted at 79 to the outside of the casing` 88.

rlhis arm 78 has a slot therein through which a stud 81 extends into the casing 38 and limits the movement of said arm 78 about its pivot 79.

i 1VVhen the arm 78 is moved about its pivot 79 the shaft 77 will be raised and lowered in a slot formed in the wall of the casing` 88.

T he front end of the arm 78 extends over in front o-f the casing 88 as at 82 and has a forward extension 88 haring a cylindrical depression 84 therein in which is mounted a ball 85 having oppositely disposed trunnions ext-ending` therefrom which extend through the ears 8G of a link 87, the lower end of which is pivotally connected at 88 to an arm 89 pivoted Aat 90 to a lug on the casing 38. The free end of the arm 89 has: lpivotally mounted thereon a block 91 adapted to travel in a curved slot 92 in a. link 93, the ripper end of which is pivotally connected at 01 to the i'ree end el an oscillating' lever 95 secured to the front end of (the oscillatingv shaft 0G mounted in bearings in the liront wall o1: the easing' 3S and in a boss 516x exltending` inwardly*from one wall of said easing' 3S.

The slotted linl J3 is provid d with a` plurality ot' indieeein characters 100 with which eer-ets a` pointer 101 on the ree end ner end an arm 10i-i projecting' toward he lronit of the easing 38 end this erm 10% piretaflly mounted in its upper face a bleek 105 having a cushion oi? leather 100 secured to its upper tace. 'llhis member has a. Coneentrie slot 107 therein through which extends holding; serew 108. The bloelr 105 adapted to freely move about its renter to vary the inclination et the fis-d 10S as will be hereinafter deseribed.

The hub oit' the arm 70X has a lug 109 extending forwardly tieret'rom in which is mounted the adjustable screw 110 with its head in Contact with thei late al lue' 111 on said erm 1011. Through this connection 109 the action ofi the spring, 76 is transmitted to the arm 104.

The split lub 411 is limited in its movement about tlre airis of' the threaded. hub 58 by means of t ie adjusting;- screw 112, the end of which beers against the 'dat upper face 113 thereof.

This split hub T1 is provided with an edliustini` serew 1111 exteueing througjh the eers 115 thereof. thus innviidine; a means for Creatin-3j a. desired ree oil" frieten beH tween seid hub and ne cylindrical nut 71:1.

rllhe presser .tout ber 72 ref-'gu'oeates in bearing-s 120. 127 iu the walls oit sing and its upper end is reduced in diameter and threaded as at 128 to reeeire the nuts l between whieh and the upper wall of the easing' is a, resilient washer130 to take up any shocks during); the downward movement oit said bei" 72. This leownward movement ot the bar 72 is imparted by helical spring 131 surrounding* the upper end of the bar 72 between the upper wall of easing` 8S and a. collar 132 secured to said ber 72 by means of a. set serew 133,

Below the coller 182 is the collar 71 secured thereto b v e, set serew 135 and pivotally eonneoted to the lower end of the linlr v1 the upper end of which is pivotally eonneeted to an erm. for ned upon the thii'eaded hub 68 as previously described.

rsf-ieee@ lireted at 1o@ to the easing 3S is a manrally actuated lever 13T having' a. linger 'l'll extending into the interior of the easingi and bearing* :against the unde' 'tare of the collar '.71 on the presser toot bar 72.

,ll-y means of this lever 137 the presse J foot may be liiited 'from the worlwhen it is desired to remove the work from the horn or i-,sert new worl thereon.

lower end oi the pr ss" 72 has formed thereon or bleek le-l, one side oi whi ui'ith .1. zrfeve 1511 (see in whieu is 'forked end ofi .fi lever mounted l i 155, to the lower en( el which is rigidly emineetefl.

x l secured a., piu projecties.' :nd posi end oi the lever me; a, 'lulii'runi therefor.

'll e nirinl'ier 156 is eonnerteiil 'ioned in the thereby forni- Wer end o? the bloei; hrs :in arm milinej downwerdlv toward the has mounted therei the Secured te `end on onnosite sides oi: the bleek ar;A two Cain iol-e es ,1G-1. each hevine: a ca slot 105 formed herein tluoufrli which e ei Ils the pin 106 eonneotin the lever with the ugper end oi" the Werl( feeding: nienber 156 rlhis pin 160 is pivetally ennemie/l to one end m7 link 107 tbe opposite oud .vhirb lly een ed :it 108 to the extension ie linli Y. the easing' m end. the eylindrieel nut To ,is a. lever 1,7,

a roller 171 on its tree end positioned in. the (fain with 172 of the cani 47.

site end of? tlm. lever 170 is nrobreaded, lees i/l ui hinted ed hub @il closely uoiaeent thea/iis Y if be lirr i' iu the will be to turn the hub ub G3 thereby Terrine' 'l be Caused to rotaie 'd stud 07 during' the ai move-mort eilt sii-id lever.

said nut 's mehr. ed upon 'the b ("7 ofi lever G0 it is obvious that l -.l be rota/ed with said nut 7S therelfiy eai sine the outer end et lever 00 to be moved .,Dwerdly by the Continued movement oii the lever 170.

This upward mov ment et tbe tree. end ot lever 00 will reuse the presser iooi;

the hub (E3 to be li Ved and at the f ie time the more- ,ment oi? the uut 753 will eause the spring ZG to be expanded and create more tension therein, thus causing a resistance to the movement of the friction nut 73.

This is accomplished by means of the extension 174 bearing upon the upper end of the block 153 at the lower end of the presser foot bar 72.

The action is as followst-'Ihe parts being in the position shown in Figs. 1 and 2, assume that a piece of work of a certain thickness is introduced beneath the presser foot, the bar 72 will descend thereon under pressure of spring 131, the link will cause the arm 69 to assume a relative position, the hub 68 turning in the nut 73, the latter being held from revolving by the spring 76 acting on the arm 75 of the collar 711, holding the collar stop 113 against the set screw 112 and the collar gripping the nut 73. Thus the presser foot may adjust itself to the thickness of the work without disturbance of or hindrance from the nut 73, and the nut 73 retains its position relative to the boss 173 of lever' 170, because,

in turning, the hub 68 turns equally in thev nut and the boss. When the boss 173 is revolved on the hub by the action of cam 172 it is screwed against the nut, (the latter having been suitably adjusted in proximity to the boss 173) and the boss and nut enter into combined action as lock nuts, thus engaging upon and turning the hub 68. The movement of the hub 68 and consequently the lift given to the presser foot from the work is thus the same whatever the thickness of the work, and the presser foot is free to adjust itself automatically to the thickness of the work. I

rI`he part 10:4-, being lifted when the presser foot bar rises, puts extra tension on the spring 76 which assists in maintaining the nut 73 and boss 173 locked together as the arm 69 rises to lift the presser bar. Since the work feed is carried by the presser foot it also takes such position as corresponds to the thickness of the work.

lll-then the lever 170 returns to its normal position, it will remove the hub 173 thereof from contact with the nut 73 and permit it to return to its normal position.

It will be noted that the block 153 on the lower end of the presser foot bar carries with it the work feeding member 156 which is provided with means whereby it may be moved about a fulcrum pin 158 extending transversely of said block 153 and whereby it may also be moved lengthwise of the presser foot bar 72.

It will be further noted that said block 153 also has mounted thereon the plates 1611 provided with cam slots 165 which control the movement of the work feeding member 156 when actuated by the oscillating lever 83 through the medium of the link 167.

The work feeding point 157 in the lower end of the work feeding member 156 is normally retained in the position indicated in Fig. 5 by the spring 159, in which position the presser foot 162 is permitted to act upon the work while the work feeding point 157 is removed from contact with said work.

The construction of presser foot mechanism herein shown and described is very effective in operation..

It is believed that the operation and many advantages of the invention will be understood readily without further description.`

Having thus described my invention, I claim:

1. In a machine of the class described a presser foot bar, a revoluble cam; a fixed stud; an exteriorly threaded hub loosely mounted on said stud and having a radial arm linked to the presser foot bar; a cylindrical nut on said threaded hub; and a lever actuated by said cam and threaded on said hub for causing it to be brought into frictional contact with said nut to rotate the hub.

2. In a` machine of the class described a presser foot bar, a revoluble cam; a fixed stud; an exteriorly threaded hub loosely mounted on said stud and having a radial arm linked to the presser foot bar; a cylindrical nut on said threaded hub; a lever actuated by said cam and threaded on said hub for causing it to be brought into frictional contact with said nut to rotate the hub; and a spring controlling the movement of said arm. i

3. In a machine of the class described, a presser foot bar; a revoluble cam; a. iXed stud; an exteriorly threaded hub loosely mounted on said stud and having a radial arm linked to the presser foot bar; a cylindrical nut on said threaded hub; a friction collar on said cylindrical nut; a lever actuated by said cam and threaded on said hub for causing it to be brought into frictional contact with said nut to rotate the hub; and means for controlling the friction between said collar and nut. I

1. In a machine of the class described, a presser foot bar; a revoluble cam; a fixed stud; an exteriorly threaded hub loosely mounted on said stud and having a radial arm linked to the presser foot bar; a cylindrical nut on said threaded hub; a friction collar on said cylindrical nut provided with a radial arm; a lever actuated by said cam and threaded on said hub for causing it to be brought into frictional contact with said nut to rotate the hub; a block near the lower end of the presser foot bar; an oscillating member the end of which rests on said presser foot block; and a spring between the arm of the friction collar and said oscillating member.

5. In a machine of the class described a presser foot bar, afrcvoluble cam; a fixed stud; an exteriorly threaded hub loosely mounted yon said stud and having radial arm linked to the presser foot bar, said bar having a groove in its lower end; a cylindrical nut on said threaded hub; a lever actuated by said cam and threaded on said hub for causing it to be brought into frictional contact with said nut to rotate the hub; a work feeding member in said groove; a fulcrum therefor; and means for moving said work feeding member about its fulcrum.

6.v lln a machine of the class described a presser foot lar, a revoluble cam; a fixed stud; an exteriorly threaded hub loosely mounted on said stud and having a radial arm linked to' the presser foot bar, said bar having a groove in its lower end; a cylindrical nut on said threaded hub; a lever actuatedby said cam and threaded on said hub for causing it to be brought into frictional contact-with said nut to rotate the hub; a work feeding member in said groove; a fulcrum therefor; and means for controlling the movement of said work feedingl member about its fulcruin as well as for moving it endwise of said bar.

7. ln a machine of the class described a presser footbar, a revoluble cam; a fixed stud an exteriorly threaded hub loosely mounted on said stud and having a radial arm linked to the presser foot bar, said bar having a groove in its lower end; a cylindrical nut on said threaded hub; a lever actuated by said cam and threaded on said hub for causing it to be brought into frictional contact with said nut to rotate the hub; a work feeding member in said groove; a fulcrum therefor; a plate carried by said presser foot bar having a cam slot coacting with a projection on the work feeding member to control the movement of said work feeding member about its fulcrum and endwise of said bar.

8. ln a machine of the class described a presser foot bar, a revoluble cam; a fixed stud; an exteriorly threaded hub loosely mounted on said stud and having a radial arm linked to the presser foot bar, said bar having a groove extending longitudinally of its lower end; a. cylindrical nut on said threaded hub; a lever actuated by said cam and threaded on said hub for causing it to be brought into frictional contact with said nut to rotate the hub; a pin extending transversely of said groove; a work feeding member having a forked upper end in said groove and straddling said pin; means for moving said work feeding member about the axis of said pin; and means carried by the presser foot for controllin0- the movement of said work feeding member about said pin and endwise of said groove.

9. In a machine of the class described a presser foot bar, a revoluble cam; a lined stud; an exterior-ly threaded hub loosely mounted on said stud and having a radial arm linked to the presser foot bar; a cylindrical nut on said threaded hub; a lever actuated by said cam and threaded on said hub for causing it to be brought into frictional contact with said nut to rotate the hub; a block near the lower end of said presser foot bar; a two part oscillating member, the end of which rests on said presser foot blo-c5; and means for adjusting the two parts of said oscillating member relatively to each other.

lO. ln a machine of the class described a presser foot bar, a revoluble cam; a lined stud; an crlteriorly threaded hub loosely mounted on said stud and having a radial arm linked to the presser foot bar; a cylindrical nut on said threaded hub; a lever actuated by said cam and threaded on said hub for causing it to be brought into frictional contact with said nut to rotate the hub; a block near the lower end of said presser foot bar; a short os -illating shaft, a member secured thereto and oscillating therewith, the end of which rests on said presser foot block; a lever loosely mounted on said short shaft and having two arms; a spring between one arm and the arm on said collar; and an adjustable member in the other arm bearing against a lug on said scillating member.

ll. .ln a machine of the class described, a revoluble cam; a lined stud: a threaded hub loosely mounted thereon and having a radial arm; a presser foot bar; a collar thereon;

link between said arm and collar; a cylindrical nut threaded to said hub; a cam lever having a boss threaded to said hub and adapted to be moved into frictional contact with said nut; a friction collar surrounding said nut and i aving an arm extending therefrom; means for regulating the friction between said collar and nut; a block on the lower end of said presser foot bar; a twopart oscillating member, the end of which rests on said presser foot block; a spring between said arm and oscillating member; and means for adjusting the tivo parts of said oscillating member relatively to cach other. i

i2. In a n'nufhine of the class described, a revoluble Cain; a lixedstud; a threaded hub loosely mounted thereon and having a radial arm; a prisser foot bar; a collar thereon; a link between said arm and collar; a cylindrical nut threaded to said hub; a cam lever having a boss threaded to said hub and adapted to be moved into frictional contact with said nut; a friction collar surrounding said nut and havin an arm extending therefrom; means for regulating the friction between said collar aud nut; a block on the lower end of said presser foot bar; a short lou oscillating shaft; a member secured thereto and oscillating therewith, the endV of which rests on said presser foot block; a lever loosely mounted on said short shaft and having` two arms; a spring between one arm and the arm on said collar; and an adjustable member in the other arm bearing against a lug on said oscillating member.

13. In a machine of the class described, a revoluble cam; a fixed stud; a threaded hub loosely mounted thereon and having a radial arm; a presser foot bar; a collar thereon; a link between said arm and collar; a cylindrical nut threaded to said hub; a cam lever having a boss threaded to said hub and adapted to be moved into frictional Contact with said nut; a friction collar surrounding said nut and having an arm extending therefrom; means for regulating the friction between said collar and nut; a block on the lower end of said presser foot bar; a short oscillating shaft; a movable member Carrying said short shaft; a member secured to said short shaft and oscillating therewith, the end of which rests on said presser foot block; a lever loosely mounted on said short shaft and having two arms; a spring be* tween one arm and the arm on said collar; and an adjustable member in the other arm bearing against a lug on said oscillating member.

Signed by me at l/Vhitman, Mass., this 22nd day of May, 1923.

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