US2410790A - Feed regulating means for sewing machines - Google Patents

Description

Nov. 5, 1946. F. PA'R'RY 2,410,790

FEED REGULATING MEANS FOR SEWING MACHINES Filed June 12, 1945 s Sheets -She et 1' WWW! mml arry F.. PARRY 2,410,790 FEED REGULATING MEANS FOR SEWING MACHINES I Nov. 5, 1 946.

' Filed June 12, 1945 s Sheets-Sheet 2 Wm/wot;

ra 11% fiaari y I Nov. 5, 1946. F. PARRY FEED REGULATING MEANS FOR SEWING MACHINES Filed June 12, 1945 I5 Sheets-Sheet 3 Patented Nov. 5, 1946 FEED REGULATING MEANS FOR SEWING MACHINES Frank Parry, Bridgeport, Conn.,,assig11or to The Singer Manufacturing Company, Elizabeth,

N. J., a corporation of New Jersey Application June 12, 1945, Serial No. 599,059

' Claims. (01. 112 -210) work-feeding elements, thereby to vary the length of the stitches produced.

It will readily be perceived that with a construction of this nature it is important that the feeding stroke of the needle or the needle will result.

This invention has as its primary object to provide improved means for simultaneously and Another object of the invention is to provide the operator may, with one hand and by a single manipulation of one element, simultaneously lock one portion of the both the upper and the ment of both eccentrics.

With the above and other objects in View, as will hereinafter appear, the invention comprises those skilled in the art.

In the drawings,

Fig. l is a longitudinal sectional view of a sewing machine embodying the present invention.

Fig. 2 is a vertical section taken substantially onthe line 2-2 of Fig. 1. l

the invention is disclosed Fig. 3 is a vertical section taken substantially on the line 33 of Fig. 1. r v

Fig. 4 is a bottom view of the machine shown in Fig. 1.

Fig. 5 is a detail sectional view illustrating improved means for pivotally mounting in the bracket-arm head an oscillatory needle-bar frame later to be described.

Fig. 6 is a perspective view of an adjusting screw later to be described.

Referring more specifically to the drawings,

as embodied in a sewing machine having a frame including a worksupporting cloth-plate or bed I and a bracketarm secured to the bedand comprising a stand: ard 2 and an overhanging arm 3, supporting at its free end a bracket-arm head 4. Journaled in anti-friction bearings 5 and 6, and disposed lengthwise within the arm 3, is a main or needlebar actuating shaft 7, carrying, at its rear end, a combined belt and hand wheel 8 having a V- shaped annular groove 9 adapted to receive a driving belt by means of which the shaft may be rotated from any suitable source of power.

Secured upon the shaft 7, adjacent its rear end, is a grooved pulley I 0 which through a clip,- belt! I drives, in one-to-one ratio, a similar pulley l2 fixed upon a lower rotary shaft E3. The shaft [3 is journaled in bearings l4, l5 and I 6 which are respectively carried by lugs l1, I8 and I9 formed integral with and depending from the under side of the bed I.,

Within the bracket-arm head 4 there is mounted, for oscillation, a needle-bar frame 20 having upper and lower arms 2| and 22 in which is reciprocably mounted a needle-bar 23, carrying,

at its lower end a pair of eye-pointed needles n.

The needlebar is reciprocated in its bearings in the arms 2| and 22 by a link 24, connected, at

its other end to a crank pm 26 carried by a crank disk 21 secured to the forward end of the shaft 1. Thus rotation of the shaft 1 eiiects endwise reciprocation of the needle-bar and the needles Cooperating with the needles, inthe formation of stitches, are two rotary loop-takers located beneath the cloth-plate i and each driven at a two-to-one ratio from the shaft l3 by gears 28, 29.

The needle-bar frame is secured to a rockshaft journaled in anti-friction bearings 31 and 32 fitted in bosses 33 and 36 in the lower end of the bracket-arm head. The bearing boss 33 carries a wear-plate 35 against which abuts the lower arm 22 of the needle-bar frame. That end of the shaft 36 within the bearing 32 is provided with a bore 36 into which is threaded a screw 31 having. it head 38 fitted within a counterborete in the.v

bracket-arm head and bearing against a spring washer M] in said counterbore. split, as shown at M in Fig. 6, and is provided with an axial bore -32 into which is threadedthe 5 body portion of an expansion plug 43 having a ments in timed relation with the movementsof the usual lower feeding mechanism hereinafter to be described, by me'ans of connections comprising arock-lever 65' formed with a split lower end adapted to be clamped bya rewrote the rockoperativelyconnected toonefend of a pitman ll, the other-end of which isformfed as a strap 4-8 which surrounds aneccentric '48 forming, a part of an adjustable eccentric device, designated gem erallyjas E, secured upon the arm shaft [1. It

will be understood that as the arm shaft ro tated the eccentric 49 actuates jthe' pitmanf fl', which in turn operates the rock-lever fi15to' oscil late, the needle-bar frame 20 about the axisjofthe rock-shaft 30. The extent of"oscillatory motion imp'arted to the needle-bar frame, 'an'drthereby theamplitude of feeding motion transmitted :to theflneedles is dependent upon the amount ofjeccentricity of the eccentric 59. In order to vary the amplitude of the oscillatory movements .ofjth'e needle-bar frame to harmonize the same with, the stitch length to which the lower feeding mechanism isa'djust'ed, the eccentric'deviceE is so constructed that the eccentricity ofthe eccentric 49 may be adjusted betweencertain limits. Inasmuch as the details of construction of this adj ustable eccentric device forms no part of the;pres ent invention, andfurthermore as the. same is completely disclosed in the United States patent of Myers, No. 2,128,031, dated August 23,. 1938, detailed illustration and description thereof in this specification is deemedunnecessary.

Suffice it to say that adjustment of the eccentric 49 is effected by relative rotation between the member I39 of the adjustable eccentric device and the arm shaft 'I. 3

Below the cloth-plate! the machineis provided with a four-motioned lower feeding mechanism including a feed-dog 50, carried by a feed-bar 5! having a fork 52 engaging a feed-lift eccentric 53 secured upon the shaft i3. .At itsf-orward endgthe feed-bar is'pivotally connected to a. feed- "rocker 54 secured upon a feed-drive rock-shaft 55 journa1ed in bearings 5i; supported in bearing bosses ''i' formed'inte'gral with "the bed-plate 1.

Upon one end of the shaft 55, there is secured a rock-arm 58 pivotally connected at 59 to oneend of a pitman 69, the other end of which is formed as a strap 51 surrounding a lower feeddrive eccentric 62 forming a part of a second adjustable eccentric device E secured upon the shaft l3. Thus rotation of the shaft 13 and the eccentrics 53 and E2 thereon, effects rising-and falling and feed-and-return movements of the feed-bar 5i and the feed-dog 59 carried thereby.

The construction of the adjustable eccentric device E on the shaft I3, is the same as that carried by the arm shaft 1 which, as above stated, is -fully disclosed in United States Patent No.

2,128,031 and includes a member 39 which is rotatable relative to its supporting shaft l3 to vary the eccentricity of the eccentric 62.

As illustrated in the drawings, the machine also includes means for providing a. thread-clearance space between the nose of a thread-carrier, (not shown) forming a part of each of the looptakers t, and stop-lugs (not shown) provided by a throat-plate 1) supported by the bed 'i. This mechanism forms no part of the present invention and therefore detail illustration and description thereof is deemed unnecessary for this disclosure. Portions of the mechanism, however, are designated generally as at.

As hereinbefore indicated, this invention relates primarily to improved means for simultaneously and synchronously varying the eccentricity of the upper feed drive eccentric49-and the lower feed-drive eccentric 62. This. means comprises a manually oscill'atable rock-shaftt3 journaled in bearingslfid, 65 formed in the arm 3.

Secured to the shaft 53,. adjacentone end thereof and by a set screw 66, is the shank bl of a handlever fiewhich projects outwardly throughan opening 69 formed in the. forward .wall of the standard 2 (see Fig. 3). The outer end of the lever 58 is flattened, as at it, so as to be grasped conveniently between the thumb andfi'nger of auser.

Secured upon the shaft 63, adjacent the bearing 64, is an arm it having an offset finger ".12 adapted, upon turning of thejslraft'fiS in one direction, to enter an apertureor notch 13 formed in the periphery of the member |39.of th'ejup'per adjustable eccentric device E.

the machine standard 2. The lower end of the link i5 is .pivotally connected, at 16, to the free 1 end of a rock-arm Ti carriedby one end of a rock-shaft 'i-8 j ournaled, parallel with the shaft 53, in bearing bosses ":9 depending from the cloth plate 8. Fixed to the other end portion of the rock-shaft '!8,'is an armBil having an offset finger Bi adapted, upon turning of the rock shaft in one direction, to enter an aperture or notch 13 in the periphery of the member 139' of the lower adjustable eccentric device ET. A

Theshaft'lt is normallybiased in a counterclockwise directiomas'seen in Fig. 3, by a torsion spring 83 surrounding the shaft and having one end thereof secured to the shaft by ascrewifld. The opposite end portion 85 01 the spring, D jojects laterally and bears against the underside of the cloth-plate I. This bias of thelshaft 18 is transmitted to the shaft 63 by the rock-armf'll, link 15 and hand-levertii. Thus the fingers 1'2 and BI of the arms H and 80, respectively; are normally maintained out of engagement' withthe '75 apertures 13 and 13 -in the members "l39 and I39'of the adjustable eccentric devices E and E.

When it is desired to vary the eccentricity of the eccentrics 49 and 62, the operator grasps the portion of the lever 68 and swings the lever upwardly in the slot 69. This simultaneously turns the shafts 63 and I8 clockwise, as seen in Fig. 3 and places the fingers 'I2 and ill in position to enter the notches l3 and I3, respectively. With the elements I39, I39 held against rotation by the fingers 72, 8I, the operator grasps the hand-wheel 8 and turns the shaft 1, which through the pulleys Ii] and I2 and clip-belt I I, simultaneously and. synchronously turns the shaft I3. Angular movement of the shafts I and I3 relative to the members I 38, I39 varies the eccentricity of the eccentrics 49 and 62, as fully described in the above mentioned Myers Patent No. 2,128,031. Turning of the shaft I in one direction increases the eccentricity of the eccentries 49 and 62 and thereby increases the length of work-feeding movement transmitted to the needles n and feed-dog 50. Turning of the shaft in the opposite direction has the opposite effect.

From the foregoing it will be apparent that with this improved and simplified feed-adjusting mechanism an operator may easily, simultaneously and synchronously vary the feeding stroke of both the upper and lower Work-feeding elements.

Having thus set forth the nature of the invention, what I claim herein is:

1. In a sewing machine having a frame including a work-supporting plate, a first work feeding mechanism located beneath said plate, a second work-feeding mechanism located above said plate, individual means for regulating the feeding action of each of said feeding mechanisms, and a single manual control means for simultaneously and synchronously controlling the action of both of the feed regulating means.

2. In a sewing machine having a frame including a Work-supporting plate, a first workfeeding mechanism located beneath said plate and including an adjustablev feed-drive eccentric, a second Work-feeding mechanism located above said plate and including an adjustable feeddrive eccentric, individual means for adjusting the feed-drive eccentric of each of said feeding mechanisms, and a single manual control means for simultaneously and synchronously controlling the action of both of the eccentric-adjusting means.

3. In a sewing machine having a frame including a work-supporting plate and a bracket-arm carried thereby having a head, a first workfeeding mechanism located beneath said plate, a second work-feeding mechanism carried by the bracket-arm adjacent said head, individual means adjacent each of said feeding mechanisms for regulating the feeding action thereof, and a single manual control means for simultaneously and synchronously controlling the action of both of the feed regulating means.

4. In a sewing machine having a frame including a work-supporting plate, a first work-feeding mechanism located beneath said plate and including a four-motioned feed-dog, a second workfeeding mechanism located above said plate and including an endwise reciprocable and laterally movable needle, individual means for regulatin the feeding action of each of said feeding mechanisms, and a single control means including a manually shiftable lever for simultaneously and synchronously controlling the action of both of the feed regulating means.

able eccentric device including relatively movable members, the relative movement of which varies the action of the associated feeding mechanism, means including a rock-shaft journaled lengthwise of said frame beneath said work-supporting plate and an arm carried by said rock-shaft for locking one of the members of the eccentric device of the first feeding mechanism against movement, means including a second rock-shaft journaled lengthwise of said bracket-arm and an arm carried by said second rock-shaft for locking one of the members of the eccentric device of the second feeding mechanisms against movement, a single manually actuable member connected ,to simultaneously turn both of said rock-shafts and the arms carried thereby into member-locking position, and means thereafter to simultaneously and synchronously turn the other members of said adjustable eccentric devices thereby to synchronously vary the action of both feeding mechanisms.

6. In a sewing machine having a frame including a work-supporting plate, a first work-feeding mechanism located beneath said plate and comprising an adjustable feed-drive eccentric device including an adjusting member having an aperture, a second work-feeding mechanism located above said plate and comprising an adjustable feed-drive eccentric device including an adjusting member having an aperture, means for adjusting the feed-drive eccentric of each of said feeding mechanisms including two shafts journaled in said frame, a locking arm carried by each of said shafts and each having a portion designed to enter one of said apertures, means to bias said shafts .to a position in which said locking arms are out of locking engagement with said adjusting members, and manually actuable means for moving said shafts in opposition .to said biasing means to engage said locking arms with the apertures in said adjusting members.

7. In a sewing machine having a frame including a work-supporting plate, a first work-feeding mechanism located beneath said plate and comprising an adjustable feed-drive eccentric device including an adjusting member having a peripheral notch, a second work-feeding mechanism located above said plate and comprising an adjustable feed-drive eccentric device including an adjusting member having a peripheral notch, means for adjusting the feed-drive eccentric of each of said feeding mechanisms including two rockshafts j ournaled in said frame, a locking arm carried by each of said rock-shafts and each having a portion designed to enter one of said notches, means including a torsion spring acting on one of said shafts to bias said shafts to a position in which said locking arms are out of locking engagement with said adjusting members, and a single manually actuable means for turning said rock-shafts in opposition to said biasin means to engage said locking arms with the notches in said adjusting members.

8. In a sewing machine having a frame including a work-supporting plate, a first rotary shaft journaled in said frame above said plate, a second rotary shaft journaled in said frame beneath said plate, first and second adjustable eccentrics each cooperating 'centrics to vary carried, respectively, by said flrst and second shafts, a lower workfeeding mechanism actuated from said second'shaft and'controlled by said secondadjustable eccentric, an upper work-feeding mechanism actuated from 'said first shaft and controlled by said first adjustable eccentric, illdividual locking members cooperating with each of said adjustable eccentrics to vary theieccentricity thereof, and a single manually actuable element operatively connected to actuate both of said locking members.

9. In a sewing machine having a-frame including a work-supporting'platefa first rotary shaft 'journaled in said frame above said plate, a second rotary shaft journaled in said frame beneath saidplate, first and secend'adjustable eccentrics carried, respectively, by said first and second shafts, a lower work-feeding mechanism actuated from said second shaft and controlled by said second adjustable eccentric, an upper work-feeding mechanism actuated from said first shaft and controlled by said first adjustable eccentric, a rock-shaft journaled in said frame adjacent and parallel to said first rotary shaft, a second rockshaft journaled in said frame adjacent and parallel to said second rotary shaft, an operative connection between said rock-shafts, a locking member carried by each of said rock-shafts and with one i or said adjustable ecthe eccentricity thereof, and

manualmeans forturningone of said rock-Shafts thereby to render eifective both of said locking emb i r t r 10 In asewing machine having a frame including 1a work-supporting plate, a first rotary shaftjournaled in said frame above said plate, a second rotary shaft journaled in said frame'b'eneath said -plate,fa driving connection between said shafts, first and second adjustable eccentric devices carriedjrespectively, by said'first and second shafts, each of said eccentric devices comprising amember normally rotated with its supporting shaft and an eccentric element associated with said member'and adapted to be shifted relative thereto by relative angular movement between said member and its supporting shaft, thereby to vary the eccentricity of said eccentric element, an upperffeeding mechanism actuated from said first shaft and controlled by said first adjustable eccentric device, a lower workfee'ding mechanism actuated from said second shaft and controlled by said second adjustable eccentric device, andme'ans controlled by a, single manually actuable element for locking both of said members'against rotation whereupon turning of one of said shafts efiects simultaneous and synchronous adjustment of both of said eccentric elements.

FRANK PARRY.

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