US2024434A

US2024434A - Feeding mechanism for sewing machines

Info

Publication number: US2024434A
Application number: US715269A
Authority: US
Inventors: George M Eames
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1933-10-03
Filing date: 1934-03-13
Publication date: 1935-12-17
Anticipated expiration: 1952-12-17
Also published as: GB415988A; DE650545C; FR777809A

Description

17 v EAMES 2,024,434

FEEDING MECHANISMYFOR SEWING MACHINES Original Fil ed 0012,..3, 1935. 4 Sheets-Sheet 2 Geo -19 MEameS "s. Memes f-2,024,434, I FEEDING mficmmsm FOR smwme mcxmms Original Filed Oct. 5,1933 4 Sheets-Shee t. 3

Wi Vweo ,1 x 2 17, 1935. is. M. EAMES FEEDING MECHANISM FOR SEWING MACHINES 4 Sheets-Sheet 4 'o ri g inal Filed Oct. 5, 1955 6807:78 MEameS Patented Dec. .17, 1935 i UNiTsn "STAT-ES PATENT [OFFICE I I 2,024,454 i FEEDING MECHANISM Iron'IsEwmG MACHINES H George Eames, Bridgeport, Conn.,-assignor to 'The SingerManufacturing Company, Eliza beth, N. J., acorporation of New Jersey 7 I 4 Original application October 3, 1933, Serial No. 691,938. Divided and this application-March 13,' 1934, Se'rial'No. 715,269 1 s .i

7 Claims. 01. i-#210) This invention relates, to improvements in work-feeding mechanisms for sewing machines and has for an objectto provide a reversible feed mechanism of simple construction and adapted to be readily assembled. Another 'objectof the invention is to provide a feeding mechanism adapted for embodiment in a sewing machine having a loop-takerrotatable about an axis substantially fparallel to the, line of feed. A still further object of the'in'ven'tion isto providejim proved means for controlling thev direction and amplitude of feed of the, work pastthestitchforming mechanism of'a seWing'machinie'.

, With the above and other more f specific objects in view,ithe invention comprises the devices, combinations and arrangements of parts hereinafter described in connection with the accompanying drawings which illustrate a preferred embodiment of the invention, from which the several features, of the invention and the advantages; attained thereby will be readily understood by those skilled in' the art; f I i This applicationis 'a division of my-prior patent application Serial No. 691,938; filed Oct. 3, n "1933. -In the accompanying drawingsvFig', 1 is a front sideelevation, partly in section, of a sewingimachine containing the present improvedjfeeding mechanism. Fig'. 2'is arear side elevation; partly in section, of the sewing machine. Fig. 3 is'a bottom plan view of the sewing machine. Fig. 4

a head 4.

.is a vertical section of aportion of the bracket-- arm standard and ,of the machine bed-plate, taken transversely of the lengthof said bed-plate and illustrating the reverseefeed'actuating and controlling mechanism. r Fig. 5 represents a transverse section of the machine bed-plate taken substantially on the line 55, of Fig. 3 and illustrating the feed-bar connections. Fig. 6 represtandard taken substantially on the line 6-6 ofFigJ. i m Referring to the drawingsgthej present improvements have been embodied in a. sewin machine having afiat bed-plate], affording a work-supporhand from one end of which rises the hollow standard 2 of a bent bracket-arm 3, overhanging the bed-plate and terminating'in Rotatably journaled in suitable bearings prof vided in said bracket-arm 3 is a horizontally disposed main-shaft 5, extending lengthwise of the bracket-arm and carrying at one end a driv- 'ing pulley 6Q Atitsopposite end, the ,main -shaft 5 carries a crank "I provided witha. crank-pin 8 axis of rotation of the' main-shaft'5. .The lower end of the gate I2 is slidably disposed in a suitable guideway provided in thehead 4 andis operatively" connected to actuating mechanism i Cooperating with the needle I l below the workin one-to-one relationship. v

connected by a jointed link 9 to a vertically disv vided upon a vibratory gatelZ, disposed within 5 the bracket-arm head 4. The upper end of the gate 1 2 ispivotally hung upon a supporting member l3 adjustably threaded vertically into the upperwallof the head 4, the pivotal axis of the gate l2 being in the present case transverse to the adapted to Vibrate said gate insuitably timed relation to the vertically reciprocatory movements of the needle-bar 10'; The needle-vibrating mechanism is described and claimed in my prior patent application Serial No. 691,938, be-

The usual spring-depressed presser-bar I4 is journaled for vertical movement in the bracket- *arm head 4, said presser-bar carrying at its lower end a presser-foot l5;

n n support is a loop-taker l6 of the' horizontal-axis rotary hook type, in which hook is journaled a thread-case l'l containing a bobbin or mass of (under thread around which the needle-thread loops are cast in the formation of lock-stitches.

, To better accommodate cooperation with the needle I l' in different paths of'reciprocation of the latter, the loop-taker I6 is supported for rotation in avertical plane rearwardly of and parallel to the plane of needle-vibration, the open side of "said loop-taker being directed forwardly. The loop-taker IBfis secured upon a loop-taker shaft I8 extending horizontally rearwardly from the loop-taker transversely of the plane of needlesents a fragmentary'fsection of thebracket-arm shaft I9 is rotatably journaled in a bearingbushingZl) fixed ina lug 2i depending from the bed-plate I. Adjacent to its other end, the looptaker actuating shaft I9 is' suitably journaled in a bearing lug 22 and carries a belt-pulley 23 connected bya clip-belt 24, with a pulley 25 upon the main-shaft 5. The shafts 5 and I9 rotate preferably housed in a gear casing 26 detachably secured upon the bearing bushing 26.

Embodied in the machine is a reversible feedmechanism adapted to advance the work, selectively in either of opposite directions, in a line transverse to the plane of needle-vibration. This feeding mechanism includes a feed-dog 21 of the lower four-motion type and operating through suitable feed-slots provided in a throat-plate 26. The throat-plate employed is of special construction and forms the subject of a separate appli-.

cation filedMar. 13, 1934, with Serial No. 715,270. The feed-dog 21 overhangs the loop-taker I6 and is secured upona feed-bar 29 pivotally secured to a feed-rocker comprising spaced upstanding arms 36 and 3| of a horizontally disposed feed-advance rock-shaft 32. The rockshaft 32 is substantially parallel to the loop taker actuating shaft I9, being journaled beneath the work-support I adjacent to the front edge thereof and in

suitable bearing lugs

33 and 34. The rock-shaft 32 is disposed entirely at one side of a vertical plane containing the axis of rotation of the loop-takershaft I8 and is bent upwardly at its end carrying the feed-rocker arms 30 and 3| to thereby provide hand clearance for more conveniently replenishing the lower thread-supply.

Adjacent to the bearing lug 34, the feed-advance rock-shaft 32 carries an upwardly extending crank-arm 35 to which is pivotally connected one end of a radius-bar 36 of which the forked opposite end pivotally carries a stud 31. The pivot-stud 31 is apertured transversely of its pivotal axis to slidably engage an upright guide in the form of a rod 36 secured at its opposite ends to spaced ears 39 bent laterally from a rocking frame 46 disposed entirely below the horizontal plane of the work-support I. The rocking frame 40 is secured upon a short rock-shaft 4| to provide for said frame a fulcrum axis passing transversely through the guide-rod at substantially the middle point of the length of said rod, said rock-shaft 41 being journaled in suitable bearing lugs below the work-support I so as to be disposed in parallelism with the feed-advance rock-shaft 32 and at the side of a vertical plane through the axis of the loop-taker actuating shaft l9 opposite to that of the rock-shaft 32. The rocking frame 46 has a fork 42 embracing a cam or eccentric 43 carried by the looptaker. actuating shaft I9 to impart the feed advance and return movements to the feed-dog.

The radius-bar 36, intermediate its ends, is provided with a laterally extending boss 44 to which is pivotally connected the lower end of a link 46 extending upwardly through an opening in. the bed-plate I and into the bracket-arm standard 2. At its upper end, the link 45 is pivotally connected to a feed-adjusting lever 46 extending transversely of the standard 2 from rear to front and being fulcrumed upon a pivotscrew 41 in the rear wall of the standard 2. The front end of the feed-adjusting lever extends through a slot 43 in the front wall of the standard 2 and is threaded to receive a nut or manipulating head 49. The head 43 is socketed in its inner face to slidably receive a sleeve 50 within which is disposed .a coil-spring 6| reacting against the head 43 and a transverse web 62 within the sleeve 50. The inner end of the sleeve 66 is partly cut away to provide vertically spaced guide-lugs 63 slidably disposed in a vertical slot 64 formed in a graduated segment-plate 66, said J adjusted position without requiring tightening of any securing nuts heretofore commonly employed.

Secured by screws 59 upon the feed-adjusting leverv 46 within the standard 2 is a. block 60 carrying at one side thereof a projection 6| provided with a recess 62 of horizontal V-shape disposed in a vertical .plane inclined to the feed-adjusting lever 46 and open toward the front of the bracketarm. Adjustably entering the v shaped recess 62 is the rounded end of a stop-screw '63 threaded through the front wall of the arm-standard 2 and having a manipulating head 64 at the outer side of the arm-standard.

30 From the foregoing description, it will be understood that in the zero or median position of throw of the feed-adjusting lever, the axis of the radius-bar pivot-stud 31 coincides with the fulcrum-axis 4i of the rocking frame 40 and accordingly the feed-dog 21 is then stationary as to work-advancing movements during the operation of the machine. Movement of the feedadjusting lever out of its zero position in either direction is adjustablylimited by the stop-screw 63, it being understood that in any set position of the stop-screw 63 the feed-adjusting lever is definitely limited to movements of equal extent in opposite directions from its zero position. As the pivot-stud 31 of the radius-bar 36 is shifted either above or below the fulcrum-axis H of the rocking frame 40 according to the direction of movement of the feed-adjusting lever out of its zero position, it is apparent that the direction and amplitude of work-advancing movements of the feed-dog may be readily controlled.

Rising andfalling movements are imparted to the feed-dog 21 from a feed-lift cam 65 carried by the loop-taker actuating shaft I3 adjacent to the bed plate lug 2|, said cam 66 being embraced by'the forked end of a rock-arm 66 extending forwardly from said cam. The other end of the rock-arm 66 is suitably secured upon a short feedlift rock-shaft 61 'journaled beneath the worksupport I in parallelism with the feed-advance rock-shaft 32 and between said rock-shaft 32 and the loop-taker actuating shaft I9. Extending rearwardly from the feed-lift rock-shaft 61, adjacent to the feed-bar 29, is a feed-lift arm 63 provided at one side thereof with a stud 69 carrying a roller 10 received in a horizontal slot 1I provided in the feed-bar 23.

The arrangement of the reverse-feed actuating mechanism entirely below the work-support not only minimizes vibration during the operation of the machine, but very materially facilitates assembly and adjustment of the parts. Furthermore, the disposition of the feed-lift rock-shaft 61 at the same side of theloop-taker actuating shaft I3 as the feed-advance rock-shaft 32 provides for employing a comparatively short and therefore rigid feed-liftrock-arm 68and 'a comparatively large feed-lift cam 65 upon the looptaker actuating shaft l9, said large cam 65 minimizing inaccuracies due to wear, and'the short rock-arm 68 insuring a positive unyielding lift of the feed-ban. As will be evident, the described construction is particularly favorable in combi-j nation with the loop-taker mechanism described,

because it permits of the disposition of the hearing lug 2| close to the vertical plane containing the axis of rotation of the loop-takersha'ft l8,

thereby affording afirm support for Q the gearof the direction and amplitude of feed-advance Gil movement of the feed-dog. It will therefore be apparent that the present feeding mechanism is simple in construction and that it is particularly well adapted for employment in a machine having aloop-taker mechanism as hereinbefore described.

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

1. A sewing machine having a work-support and a bracket-arm rising therefrom, a mainshaft joumaled in said bracket-arm, a reciprocatory needle, a rotary loop-taker, a looptaker actuating shaft joumaled for rotation below said work-support and disposed substantially parallel to said main-shaft, driving connections between said shafts, feed-advance and feed-lift rockshafts journaled below said work-support, said rock-shafts being disposed substantially parallel to and both at the same side of a vertical plane containing the axis of rotation of said loop-taker actuating shaft, a feed-dog, a feed-bar carrying said feed-dog and operatively connected to said rock-shafts, and feed-cams carried by said looptaker actuating shaft for imparting operative movements to'said rock-shafts.

2. In feeding mechanism for sewing machines, a frame including a work-support and abracket- -arm rising therefrom, a main-shaft journaled in said bracket-arm, a reciprocatory and laterally vibratory needle actuated by said main-shaft, a lower rotary shaft journaled belowsaid worksupport at one side of a vertical plane passing through the longitudinal center line thereof and connected to be driven by said main-shaft, a rotary loop-taker operating in a plane parallel to said vertical plane, a loop-taker supporting shaft transverse to and geared to said lower rotary shaft, a feed-bar, a feed-dog mounted on one end of said feed-bar, a feed-rocker to which the other end of the feed-bar is pivotally connected, 7

a feed-advance rock-shaft carrying said feedrocker, a feed-lift rock-shaft connected to impart rising and falling movements to said feed- .bar, said feed-advance and feed-lift rock-shaft being mounted below said bed at the same side of the lower rotary shaft, and means for actuating said rock-shafts. j t

3. A sewing machine having a work-support and a hollow bracket-arm standard rising therefrom, stitch forming vmechanism, a feed-dog, a feed-bar carrying said feed-dog, feed-advance and feed-lift actuating connections with said feed-bar, said feed-advance connections including a feed-advance rock-shaft, a rocking frame journaled beneath said work-support, means for rocking'said frame, a radius-bar having one end operatively connected to said feed-advance rock- '5 shaft and its other'end slidably connected to said rocking frame for movement from one side to the other of the fulcrum-axis of said frame, a feed-adjusting lever pivotally mounted upon said bracket-arm standard, a link connecting said 10 feed-adjusting lever and the radius-bar toshift said radius-bar upon said rocking frame upon movement of the feed-adjusting lever, whereby to control the direction and amplitude of the work-advancing movements imparted to the feeddog, a block carried by said feed-adjusting lever within the bracket-arm standard and having a horizontal V-shaped recess, and a stop-screw threaded into said standard in position to enter said'recess and thereby limit adjustment in opposite directions of said feed-adjusting lever.

4. A sewing machine having a work-support and a bracket-arm overhanging the work-support, a reciprocatory needle, a rotary needle-reciprocating shaft journaled in said bracket-arm, 5 a loop-taker, a rotary loop-taker actuating shaft journaled. beneath said work-support, driving connections between said shafts, a work-advancingfeed-dog, a feed-bar ca y g said feed-dog,

a feed-advance rock-shaft journaled beneath said worksupport and operatively connected to said feed-bar, said feed-advance rock-shaft being disposed at one side of and in parallelism with said loop-taker actuating shaft, a rocking frame beneath said work-support and having its fulcrum-axis disposed in parallelism with and at the side of the loop-taker actuating shaft opposite to that of the feed-advance rock-shaft, a cam upon: aid loop-taker actuating shaft for rocking said frame, a radius-bar extendingacross said M loop-taker actuating shaft and having one end operatively connected to said feed-advance rockshaft, the other end of said radius-bar being slidably connected to said rocking frame for movement from one side to the other of the fulcrum-axis of said frame, manually operable connections with said radius-bar for shifting said bar upon said rocking frame to thereby control the direction and amplitude of the work-advancing movements imparted to said feed-dog, a feedlift rock-shaft journaled beneath said work-support in parallelism with and at the feed-advance rock-shaft side of said loop-taker actuating shaft, means for actuating said feed-lift rock-shaft from said loop-taker actuating shaft, and a rock-arm carried by said feed-lift rock-shaft adjacent and connected to said feed-bar.

5. A sewing machine having a member provided with a slot, a pivotally supported adjusting-lever extending through the slot of said member and provided adjacent thereto with a manipulating head,said head having a socket in the side thereof proximate to said member, a sleeve slidably disposed within the socket of said head for engagement with said member, and a spring housed within said head for effecting frictional engagement of said sleeve with'said member, whereby said adjusting-lever is frictionally held in different adjusted positions thereof lengthwise of said slot. 3 m

6. A sewing machine having a member provided with a segmental slot, a pivotally supported adjusting-lever having one end extending through said slot, a lever-manipulating head detachably secured upon said end of the adjusting lever V5 and having a socket in the side thereof proximate to said member, a sleeve slidably disposed within the socket of said head and having at one end thereof spaced guide-lugs disposed in the slot of said member, and a spring housed within said'head for effecting frictional engagement of said. sleeve with said member, whereby said adlusting-lever is frictionally held in different adiusted positions thereof lengthwise of the slot of said member.

I. A sewing machine having a work-support and a bracket-arm rising therefrom, a vertically reciprocatory needle, a horizontally disposed needle-reciprocating shaft journaled in said bracket-arm, a rotary loop-taker carrying shaft disposed horizontally below said work-support with its axis transverse to the axis of rotation of said needle-reciprocating shaft, a rotary looptaker actuating shaft journaled horizontally below and transverse to said loop-taker carrying shaft, driving connections between said 100ptaker carrying and actuating shafts, connections for rotating said loop-taker actuating and needlereciprocating shafts in one-to-one relation, a feed-dog, feed-advance and feed-11ft cams carried by said loop-taker actuating shaft, and 10 means for imparting operative work-feeding movements to said feed-dog from said cams, including manually controllable connections for reversing the direction of feed.

GEORGE M. EAMES.