US2009747A

US2009747A - Sewing machine

Info

Publication number: US2009747A
Application number: US627234A
Authority: US
Inventors: Sauer George
Original assignee: Union Special Machine Co
Current assignee: Union Special Machine Co
Priority date: 1932-08-02
Filing date: 1932-08-02
Publication date: 1935-07-30
Anticipated expiration: 1952-07-30

Description

Juy 30, 1935.

G. sAUl-:R 2,009,747

SEWING MACHINE Filed Aug. 2, 1932 4 Sheets-Sheet l Juy 30, 1935. G. sAUER 2,009,747-

SEWING MACHINE Filed Aug. 2, 1932 4 Sheets-Sheet 2 July 30, 1935. G, SAUER 2,009,747

SEWING MACHINE Filed Aug. 2. 1952 4 Sheets-Sheet 3 G SAUER July 3U, 1935.

SEWING MACHINE Filed Aug. 2, 1932 4 Sheets-Sheet 4 Patented July so, 1935 2,009,747

UNITED STATES PATENT OFFICE SEWING MACHINE George Sauer, Berwyn, Ill., assigner to Union SpecialMachine Company, Chicago, Ill., a corporation of Illinois Application August 2, 1932', serial' No. 627,234

s claims. (C1. 11a- 209) The invention relates to new and useful iming the usual supporting brackets on which the provements in a sewing machine, and more parwork support 2 is mounted. Attached to said bed ticularlyto a treadle controlled differential feedand located at one side of the work support is a ing mechanism which is particularly adapted for lstandard 3. Mounted for rotation on the stand- ?5 use in connection With the overedging machine of ard 3 is a main actuating shaft 4 driven by a belt 5 rthe type shown in the patent granted Norman V. Wheel 5. The needlebar reciprocates in a needle Christensen and Frederick F. Zeier, March 25, head carried by the bracket and is provided with 1930, fNo. 1,751,508. In this type of machine, the a needle E. Cooperating Withthe needle beneath main shaft is located above the Work support and the Work support is a looper which is mounted in fjg extends in the general direction of-the line of a looper carrier/1. Cooperating with the looper 10 feed. The parts beneath the work support are beneath the work support and the needle above operated by eccentric straps cooperating with the Work support, is a looper mounted in a icareccentrics onthe main shaft and extending berier 8. The stitch forming mechanism is of the neath the work support. The work support character shown in the patent granted Frederick fig terminates at a short distance from the line of F. Zeier and Charles F. Rubel, June 21, 1932, No. 15 feed,-so as to provide roo-m for the operation of 1,864,393. The looper cooperating with the the Yeccentric straps. This greatly restricts the needle beneath the work supportis actuated by space in which the feeding mechanism beneath an eccentric strap 9 cooperating with an eccentric the worksupport may be located. Y I9 on theV main shaft 4. The looper which moves An object'of the present invention is to provide over the work support is operated by an eccentric 20 a, machine of the above type with a differential strap II cooperating with an eccentric I2 on the feeding mechanism and a treadle controlled means main shaft. -for regulating thelength of-the feed stroke ofthe The material is fed to the needle by a feedingl auxiliary feed dog, all of which can be placed bemechanism which includes a main feed dog I3 25 heath the work support. Y A and an auxiliary feed dog I4. These feed dogs 25 A further object of the invention is to provide operate through a throat plate I5 carried by the a differential feeding' mechanism of the above Work support 2. The work support, as shown in type, with a means for regulating the throw of Fig. 2, terminates adjacent one side of the feed the auxiliary feed dog, which includes positive line which is determined by the feed dogs' I3 "3@ connections and few parts. and I4. The machine is particularly designed 30 In the drawings for operating at the edge of a fabric, and es VFigure 1 is a View partly in section and partly shown, the machine is provided with an overin side elevation showing a machine embodying edging'mechanism. the invention; Y Operating on the' material in advance ofthe Fig. 2 is a view partly in plan and partly in stitching point is a trimming blade I6 carried 35 section showing the parts immediately beneath bya lever II whichk is pivoted at I8. II'he lever the work support, the loopers and parts of the I'I is provided with a stud I''L carrying a ball operating devices therefor being omitted for'the with which the eccentric strap I9 is connected. sake of clearness, and the outline of the work sup- This eccentric strap I9 cooperates with an ec- 40 port being indicated in broken lines; centricV 26 on the main shaft. The Vmain feed 40 Fig. 3 is a View in perspective showing the difdog; I3 is'rigidly attached to' a feed bar 2 Iv which ferential feeding mechanism and the treadle conextends `to the `rear side of the machine and is trol therefor; pivotallymounted on a pin 22 carried by the Fig. 4 is a sectional view on the line 4 4 of feed rocker 23 carrying

sleeves

24 and 25 in which Fig. 1; 'the pinv is fixed. The' feed rocker 23 is pivotally 45 Fig. 5 is a perspective View of the coupling pin mounted' on alpin 236v journaled in lugs on the bed joining the operating link for the Vdifferential I. This feed rocker 23 carries a iorwardlyprofeed dog to the bracket on the feed rocker; jectingarm 2l which is provided with a ball stud Fig. 6 is a sectional view on the line Iif-G of 28. AnY eccentric stralol2!) is connected tothe bali 39 Fig, 2, and stud 28` and cooperates with an eccentric 30 on 50 Fig. '7 is a horizontal sectional View showing the the` m'an Shaft. ThSpIOVdeS a means whereby ypin connecting the eccentric strap to the trimmer the mairifeed bar is moved back and forth, 'imlever and the feed bar.' parting a feeding movement to the mainr feed The invention is shown as applied to a sewing dog I3. 1 machine whichincludesasupporting bed Icarry- The stud I='I` carries a pin 3|, the center of 55 feed bar in the supporting lugs therefor.

which is located nearer the pivotal support I8 for the lever l1 than the center of the stud I1, A link 32 is connected to this pin 3l and to a pin 33 attached to the feed bar 2|. When the lever I1 is raised and lowered for the trimming of the fabric, the feed bar is also raised and lowered, but the up and down movements imparted to the feed bar are less than the reciprocating movements of the trimmer. The feed dog carried by the feed bar moves into engagement with the fabric and lifts the same, while the trimmingY blade passes through and cuts the fabric. This provides a means whereby ample trimming stroke may be given to the trimming blade without imparting an excessive stroke to the feed bar for raising and lowering the feed dog.

The auxiliary feed dog i4 is secured to a bracket 34 by means of a screw 35. This bracket 34 is attached to the forward end of the auxiliary feed bar 35. This auxiliary feed bar 36 is cylindrical in shape, and is vmounted for reciprocation in spaced

lugs

31 and 38 carried by the main feed bar. Located on the auxiliary feed bar between the

spaced lugs

31 and 38 is Va block 39. The block 39 carries a pin 40 which extends through a slot in the main feed bar 2|. 'Ihis main feed bar carries

guide plates

42, 42, between which the pin 46 is guided. The purpose of this pin and the guide plates is to maintain the auxiliary feed bar horizo-ntal and prevent any angular or twisting movement of the auxiliary The block 39 is provided with a pin 43 with which a link 44 is connected. This link imparts reciprocations to the auxiliary feed bar. This particular mounting for the auxiliary feed bar and the operating connection thereof forms no part of the present invention per se, but is shown, described and claimed in the application of Frederick F. Zeier and Clarence C. Smith, filed November 5, 1930, Serial No. 493,648.

The link 44 is provided with

forks

45 and 46 which are spaced and receive therebetween a bracket arm 41 formed integral with the feed rockerk 23. This bracket arm is provided with a slot 48. A pin 49 having a cylindrical head 50 and a flat-sided portion 5 l, and also a cylindrical portion of reduced diameter 52, serves as a connecting means between the forked end of the link 44 and this bracket arm 41. Thecylindrical portion 50 of the pin is housed within the fork 45, theflat-sided portion 5l of the pin is housed within the bracket, and the reduced cylindrical portion 52 extends thro-ugh the fork 46 and projects therefrom. Y

A link 53 is pivotally connected to the projecting portion of the pin at its upper end, and is secured to the pin by a screw 54 threaded into the end of the pin. The lower end of the link 53 is pivoted Vat 55 to a lever 56. The lever 56 is mounted on a fulcrum support 51 carried by a bracket 58 attached to the bed of the machine. The lever lies beneath the work support and extends to the front of the machine. A flexible chain or the like 59 is connected to the free end of the lever, and to a suitable treadle or knee shift for operating said lever. A spring 60 encircles the fulcrum support for the lever and bears at one end against the bed and at its other end against the lever, and normally tends to turn the lever in a counter-clockwise direction as viewed in Fig. 1. The bracket 62 secured by. screws 63, 63 to the bed of the machine, extends up alongside of the lever 56. This bracket'is slotted at 64, and is provided with two stop lugs throw of the auxiliary feed dog.

65 and 66, one above and the other below the free end of the lever 56. These studs may be shifted in the slot to different set positions. When the treadle is released, the free end of the lever will be raised by the spring until the lever contacts with the lug 66. This will place the pin 49 to which the link 44 is attached at a definite set position in the slot in the bracket arm 41. When the treadle is depressed, and the free end of the lever moves into contact with the stop lug 65, and the pin 49 will be raised in the slot 4B of the bracket arm 41. This will increase the By shifting these stop lugs, the desired throw of the auxiliary feed dog relative to the main feed dog may be obtained. When the pin 49 is at the lower end between the main feed bar and the feed rocker, that the feed dogs will move substantially in unison. By depressing the treadle without stopping the machine, the stroke of the auxiliary feed dog may be increased, Yand when the treadle is released, the stroke of the auxiliary feed dog will be shortened.

Cooperating with both the main and the auxiliary feed dog is a presser foot 61 carried by a lever 68 pivotally supported on the standard. Said presser foot is yieldingly moved into contact with the material by a plunger 69 which is spring-pressed.

From the above it will be noted that the main feed shaft extends in the general direction of the line of feed, although at an acute angle thereto. The axis of the main shaft lies substantially in the line a, a of Fig. 2, while the feed is in the direction of the arrow shown in this figure. The work support terminates at a short distance from the line of feed. The machine is particularly designed for stitching along the edge of a fabric, and therefore, it is not necessary to extend the work support any great distance to the right of the trimming line, as viewed from the front of the machine. The operating eccentric straps for the part beneath the work support pass down along the side of the work support. The feeding mechanism is all beneath the work support and consists of very few parts positively connected. The control lever for the auxiliary feed dog is likewise beneath the work support. By this simplified arrangement of the control means and the operating parts Vfor the auxiliary feed dog, a feeding mechanism has been provided for this particular type of machine, rso that a differential feeding action may be obtained whenever desired.

It is obvious that minor changes in the arrangement of parts and the details of construction may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what I claim as new anddesire to secure by Letters Pat-- ent, is-

l. A sewing machine comprising in combination a supporting bed, a work support carried thereby, a standard at one side of said work support, a main shaft mounted on said standard and extending in the general direction of the line of feed, a differential feeding mechanism located ybeneath the work support` and including a main feed bar, a main feed dog carried thereby, an auxiliary feed bar, an auxiliary feed dog carried thereby, means for reciprocating said feed dogs and imparting to the auxiliary feed dog a differential-lmovement including a shiftable link VVfor varying the throw of theauxiliary feed dog, said means being operated from said main shaft above the worksupport, means operated from said main shaft for raising and lowering said feed bar, and treadle-controlled means located beneath the work support for varying the stroke Aof the auxiliary feed dog including a lever pivoted intermediate its ends and having a direct connection at one end to said shiftable link andy atits other end to a treadle.

1 2. A sewing machine comprising in combination supporting bed, a work support carried thereby, a standard at one side of said work support, a main shaft mounted on said standard and extending in the general direction of the line of feed', a differential feeding mechanism located beneath the work support and including a main feed bar, a main feed dog carried thereby, an auxiliary feed bar, an auxiliary feed dog carried thereby, means operated from said main shaft for raising and lowering said feed bar, a feed rocker to which said main feed bar is connected, means operated by the main shaft and connected yto said feed rocker for oscillating the same, a

bracket arm carried by the feed rocker, a link having a shiftable connection with the bracket arm and connected to the auxiliary feed bar for reciprocating the same, and a treadle-controlled means located beneath the work support for varying the stroke of the auxiliary feed dog, including a lever pivoted intermediate its ends and connected at one end to said shiftable link and at its other end to a treadle.

3. A sewing machine comprising in combination a supporting bed, a work support carried thereby, a standard at one side of said work support, a main shaft mounted on said standard and extending in the general direction of the line of feed, a differential feeding mechanism located beneath the work support and including a main feed bar, a main feed dog carried thereby, an auxiliary feed bar, an auxiliary feed dog carried thereby, means operated from said main shaft for raising and lowering said feed bar, a feed rocker to which said main feed bar is connected, means operated by the main shaft and connected to said feed rocker for oscillating the same, a bracket arm carried by the feed rocker, a link having a shiftable connection with the bracket arm and connected to the auxiliary feed bar for reciprocating the same, a lever mounted beneath the Work support to one end of which the treadle is adapted to be connected, and a link connected to the other end of said lever and operating to shift the actuating link for the auxiliary feed bar to different set positions on the bracket arm.

fi. A sewing machine comprising in combination a supporting bed, a work support carried thereby, a standard at one side of said work support, a main shaft mounted on said standard and extending in the general direction of the line of feed, a differential feeding mechanism located beneath the work support and including a main feed bar, a main feed dog carried thereby, an auxiliary feed bar, an auxiliary feed dog carried thereby, means operated from said main shaft for raising and lowering said feed bar, a feed rocker to which said main feed bar is connected, an arm projecting from said feed rocker, means actuated by the main shaft and connected to said arm for oscillating the feed rocker, a slotted bracket arm carried by the feed rocker, a link pivoted to the auxiliary feed bar and having a forked end straddling the bracket arm, a pin extendingv froml said forked endfof thevlinkland through thef'slot in said bracket arm, `a IlinkV con'- nected to said pin,andja"lever wte'one' end l `ci' which said last-named vlink'is connected atfthe other end-,the other-'end of said lever being adapt# ed tofbeconnected tofaltreadle whereby'said lever may be manually shifted to'move the-pin to different set positions on the bracket arm for varying the throw ofthe auxiliary feeddo'g.

5. A sewing machine comprising irr'combina'- tion a supporting bed, a work support?carried thereby, a standard at one'side of said worksnp port,\a main shaft mounted on said standard and extending in the general direction lof the linefo'f feed, a differential 'feeding-mechanism located beneath the work support andincludingfa` main feed bar, a main feeddog carriedthereby, Ean aux# iliary feed bar, an auxiliary feed dog carried thereby, means operated from said main shaft for raising and lowering said feed bar, said main feed bar having spaced lugs in which said auxiliary feed bar is mounted for reciprocation, meansfor preventing said auxiliary feed bar from oscillating in said lugs, a link pivoted to the auxiliary feed bar intermediate said spaced lugs, a feed rocker to which said main feed bar is pivotally connected, a slotted bracket arm carried by the feed rocker to which said link is shiftably connected, and treadle-controlled means for shifting said link to different set positions.

6. A sewing machine comprising in combination a supporting bed, a work support carried thereby, a standard at one side of said work support, a main shaft mounted on said standard and extending in the general direction of the line of feed, a differential feeding mechanism located beneath the work support and including a main feed bar, a main feed dog carried thereby, an auxiliary feed bar, an auxiliary feed dog carried thereby, means operated from said main shaft for raising and lowering said feed bar,*said main feed bar having spaced lugs in which said auxiliary feed bar is mounted for reciprocation, means for preventing said auxiliary feed bar from oscillating in said lugs, a link pivoted to the auxiliary feed bar intermediate said spaced lugs, a feed rocker to'which said main feed bar is pivotally connected, a slotted bracket arm carried by the feed rocker to which said link is shiftably connected, a lever located beneath the work support and adapted to be connected to a treadle, and a link connected to said lever and to the firstnamed link for shifting the connection thereof to the bracket arm to different set positions.

7. A sewing machine comprising in combination a supporting bed, a work support carried thereby, a standard at one side of said work support, a main shaft mounted on said standard and extending in the general direction of the line of feed, a differential feeding mechanism located beneath the work support and including a main feed bar, a main feed dog carried thereby, an auxiliary feed bar, an auxiliary feed dog carried thereby, means operated from said main shaft for raising and lowering said feed bar, said main feed bar having spaced lugs in which said auxiliary feed bar is mounted for reciprocation, means Y alinkconnected Vto said'lever and tothe firstnamed 'link for shifting the connection. thereof to the bracket arm to different set positions, a spring for moving said lever inonedirection, and spaced strop lugsfor limiting`r the movement of said lever and for determining'the 4set position of A the connection between therlinkv and the bracket arm.

8. A sewing machinevcomprising in combination amsupporting bed, a work support carried thereby, a mainfeeld bar located beneath the Work support, a feed dog carried thereby, means for raising and loweringl said main feed bar,l a feed rocker to which lsaid main feed bar is connected for imparting feeding `movements to the feed dog, an auxiliary feed bar, means for raising and lowering said auxiliary feed bar in timing with said main feed bar,: means connecting said auxiliary feed bar to said feed rocker for moving said auxiliary feed bar end wise andimparting feeding movements tothe auxiliary feed dog including a shiftable link whereby the extent of movement imparted to the auxiliary feed dog may be varied, a lever located beneath the work support and extending from a point adjacent the feedrocker to a point adjacent the front of the machine, means for pivotally supporting the lever intermediate its ends, means for directly connecting the rear end of said lever to said link for shifting the same and a flexible means connected to theother end of said lever and adapted to be connected to a treadle whereby said lever may be shifted. y l Y l y GEORGE SAUER.