US1293560A - Overseaming mechanism for sewing-machines. - Google Patents

Description

D. S; SEYMOUR. OVERSEAMING MECHANISM FOR SEWING MACHINES. APPLICATION FILED DEC. 27. I915.

Patented Feb. 4, 1919.

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D. S. SEYMOUR.

OVERSEAMING MECHANESM FOR SEWING MACHfNES.

APPLICATION FILED DEC. 27 I915.

1,293,560, Patented Feb. 4, 1919.

5 SHEETS-SHEET 2.

Witmoo Gum/c1 3 D. S. SEYMOUR.

OVERSEAMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DEC.27,.I9I5.

Patented Feb. 4, 1919.

5 SHEETSSHEET 3 S lvan wot Wuhan i). S. SEYMOUR.

OVERSEAMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DEC. 27. I915.

Patented Feb. 4, 1919.

5 SHEETSSHEET 4 5 ms co, nmurnc. wAsnlNsvuN D c D. S. SEYMOUR.

OVERSEAMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DEC. 27, 1915.

Patented Feb. 4, 1919.

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DUDLEY S. SEYMOUR, 01? OAK PARK, ILLINOIS, ASSIG-NOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

OVEBSEAMING MECHANISM FOR SEWING-MACHINES.

To all whom it may concern: a. 'Be it knownthat I. DUDLEY S. SEYMOUR,

a citizen of the United States, residing at improvements in over-seaming mechanism for sewing machines and more particularly a; the mechanisms for operating the looper and spreader. a Y a An object of the invention-is to provide a sewing machine of the above character with mechanisms for operating the looper and spreader wherein a greater portion of sewing machine having a supporting bed 1 the operating parts are housed within the standard of the sewing machine,

A further object of the invention is to provide a machine of the above character withmec hanism for operating the looper wherein said looper may be given a dwell at the forward end of its stroke and wherein the actuating shaft for the looper extends transversely of the standard and is connected to said looper from the rear side of said standard. 7 i i r i v These and other objects-will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings, which show by way of illustration one embodiment of the invention:--

Figure 1 is a view partly in front elevation and partly in section of a sewing machine having the improvements embodied ere Fig. 2 is a view partly in plan and partly in section-showing the looper operating mechanism, the spreader operating mecha nismand the feedingmechanismt Fig. 3 is a view partly in end elevation and partly in section with certain of the Specification of Letters Patent.

Application filed December 27, 1915. Serial No. 68,788.

needle, the looper and the spreader and a portion of the operating mechanisms there- F i 5 is an enlarged view showing the relation of the needle, the looper and, the spreader to the fabric just as the spreader is engaging the looper thread;

Fig. 6 is a similar view but showing the spreader as having moved slightly forward to form the loop in the looper thread;

Fig. 7 is a slmilar view but showing the spreader having positioned the looper thread loop for the needle to enter;

Fig. 8 is a similar view'but showing the spreader and looper fully retracted;

Fig. 9 is a top plan view of a fabric stitched onmy improved machine; and

Fig. 10 is a bottom plan view of the same.

The invention isshown as embodied in a carrying ahollow standard 2 having an and connected by a link 9 to the needle bar. Said needle lever 7 is oscillated by a link 10 which cooperates with an eccentric. on the main shaft 11 of the machine. The material to be stitched is carried by a work support 12. A presser foot 13 holds the ma terial on the work support and a feed dog 14 advancesthe material over the work sup port. Said feed dog is carried by a feed ar 15 which is raised and lowered by a suitable cam or eccentric on the main shaft 11 and this feed bar is moved back and forth by an eccentric strap 16 which is con nected to the feed rocker at the rear side of the machine. The feed bar 15 is also pivoted to said feed rocker. These partsare of the usual construction and will not need further description. i

Cooperating with the needle beneath the work support is a thread carrying looper 18. Said thread carrying looper is fixed to the forward end of a rock shaft 19 mounted in suitable bearings 20 and 21 carried by the supporting bed of the machine. This this upwardly projecting arm The other end of this link is connected to a ball stud carried by an arm :24 fixed by a screw 25 to a cross shaft 26. V

The standard 2 as above noted is hollow and has an inwardly projecting '"IbQSS 27 which forms a bearing for the cross shaft 26. Said cross shaft 26 at its inner end and. within the hollow standard is provided with an arm 28 which is securedtothecross-shaft by a screw 29. This arm 28 is carriedby a link 30 with the needle lever-extension '31. As the needle lever extension oscillates it will impart an oscillation to the shaft' 26 and. this will move the-link .24 back and forth and1thus-rock*the looper.

The looper is mounted so as to cooperate with the needle wholly fbeneath the .work support. Said looper moves forward into the needle 100p I The link '30 connecting the needlelever extension 'to thearm 28 is substantially in alinement with the needle llever extension when theilooper is at :"theforward 'end of its stroke'and,therefore, said looper is' given a dwell at thistime. Cooperating Withfthe looper andwith the needle. is a spreader 32. This spreader 32 is mounted .an elbow lever 33 which is pivotedzat 34 toabraoket Saidbracl'zet35 is'fixedjtothe bed plate by suitable clamping bolts. \The elbow'lever '33 has a rearWardly-projecting 21111136. A link 37 is connectedto the outer end'o'f this arm and said linkis also. connected to an arm. 37 which is pivoted 2111.38 to'the'oraoket A link 39 vis connected to the pivoted bolt 40 which joinslthelink ti and'the arm 37. This link 39 at its other end is pivoted tolaball stud carried atythe lower end of a lever 42 which is pivoted at 453 on astud carried by a bearing mounted within the hollow standard. The other arm ofthe lever is connected by an eccentric strap 44 and this eccentric-strap cooperates with an eccentric on the main shaft 11. The spreader is provided with a forked end 45 and also with a spreading "finger 46. This spreading finger is disposed in rear of the needle, and the needle on 'its downward stroke holds itsown threadover the spread ingflfinger and this prevents .the previously locked loops from becoming slack and assists in 'the formation of the stitches. "The spreader per Se and theme'chanism for operating the same form no part'of the present invention except in connection with'theother elements of the sewing machine. Said spreader mechanism and said spreader are shown, described and claimed in-Iny copending application, Serial No. 68,787, filed of even dateherewith. p

When the spreader is at the'lower end of its stroke the link 36 and the arm 37 are substantially in alinement and this Wlll glve a dwell to the spreader at this time.

As clearly shown in Fig. 5 the spreader when at the lower end of its stroke is ust -;below the pathuof movement otthe looper.

-:The looper vin'this figure-has reached the forward end of its stroke and is at a dwell,

:by-rea'son-Zofltheifact-fthat the link 30 and the needle lever extension 31 are at this time substantially in alinement. This 1 dwell *to the looper gives ample time for the spreader *to moveTorwa'rd-so' as to engage the looper thread. u t.

y In Fig. 6 of the drawing I have "shown the spreader forming. the-looper thread into a loop. Said spreader when it en'ga gesthe loopetthread is moved substantiallyhiin -a vertical direction for the reason ,thatE'the pivotal support of the. spreader is substantially on ahori'zontaliline passingi through 'theforward -end of the spreader. "Whefithe 'spreaderi-reaches 'the'up'per end of itsst'rdke it {is moving in a substantially horizontal path for the reason that] the pivotal jpoint off'the spreader is close to theneedle be- 'neath'the work support; The spreaderp'ositions the looperthread loop forthe needle .to enter as shown in Fig. 7. -"The looper during this time'has remained substantially at the forward end of 'its' stroke. -.Afterl-the needle has entered the, looper thread loop then I the looper fand spreader are 7 both 1 retractedto thepositio-n shown in Fig. 8 and the continued downward. movement of the needle jdraws :up on the loops. and sets (the stitch. v V i I It will "be noted: from the l abov'e that the greater portion 'of'the operating. mechanism for the spreader and l for the looper-f is housed within thehollow standard. "My .machine is particularly adapted "for operating upon heavy material such as coarse "burlapgfor forming bags and itiis desirable vinthis-type of machine to inclose and house as .far as possiblethe operating parts v so as -.to keep the lint and dirt away from'the operating parts. Furthermore-by my improved mechanism the looper is operated from a .cross shaft extended transversely of the hollow standard and .the connectionto .this'cross shaft is inrear of the standard. f The opcrating mechanism for the looper, therefore,

is entirely free from the operating mechanism for the spreader and givesgreater room and freedom of movement forthe op; crating parts. This positioning of, the looper operating shaft in an extendediboss formed in the hollow standard also makes a very durable support-"for the operating mechanism for they looper.

InFigs. 9 and 1 0 I have shown a fabric cated at, a while-the looper thread. is indicated at Z. "It willbe notedthat the needle indicated a F, 'the nee-(116 thread. is in'dilooper thread loop passes throu h the needle loop around the edge of the abric and is locked by the next needle thread loop as it passes through the fabric. I

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is a i :1. A sewing machine comprising in combination, a work support, a hollow standard carrying anoverhanging" arm, a needle reciprocating at the free end of saidoverhanging arm, a needle lever for reciprocatingsaid needle, a looper cooperating with the'needle beneath the'work support, a cross shaft mounted in a suitable bearing in said standard, an arm carried by said cross shaft and located in rear of the standard, a link actuated by said arm for oscillating said looper, a second arm carried by said cross shaft and located within said hollow standard, a link connecting said second arm with an extension on the needle lever, said link and said needle lever extension being so positioned as to move substantially into alinement when the looper is at the forward end of its stroke for giving a dwell thereto.

2. A sewing machine comprising in combination, a work support, a hollow standard carrying an overhanging arm, a needle reclprocating at the free end of said overhangino' arm, a needle lever for reciprocating said needle, alooper cotiperating with the needle beneath the work support, a cross shaft mounted in a suitable bearing in said standard, an arm carried by said cross shaft and located in rear of the standard, a link actuated by said arm for oscillating said looper, a second arm carried by said cross shaft and located within said hollow standard, a link connecting said second arm with an extension on the needle lever, said link and said needle lever extension being so positioned as to move substantially into alinement when the looper is at'the forward end of its stroke for giving a dwell thereto, a spreader cooperating with the looper beneath the work support and with the needle above the work support and means for oscillating said spreader.

3. A sewing machine comprising in combination, a work support, a hollow standard carrying an overhanging arm. a needle reciprocating at the free end of said overhanging arm, a needle lever for reciprocating said needle. a looper coiiperating with the needle beneath the work support, a cross shaft mounted in a suitable bearing in said standard,- an arm carried by said cross shaft and located in rear of the standard, a link actuated by said arm for oscillating said looper, a second arm carried by said cross shaft and located within said hollow standard, a link connecting said second arm with an extension on the needle lever, said link and said needle lever extension being so positioned asfto 'move substantially mm allnement when the looperis at the forward end of its stroke for giving a dwell thereto, a spreader coiiperating with the looper beneath the work support and with the needle above the work sup port, means for oscillating said spreader, a spreader cooperating with the looper be neath the plane of the work support and with the needle above the Work support, illGflIlS for oscillating said spreader and for giving a dwell thereto at the lower end of its stroke 7 l l. A sewing machine comprising in combination, a hollow standard, an overhanging arm carried thereby, a needle bar carrying said needle and reciprocating in said overhanging arm, a needle lever for reciprocating the needle, said needle lever having an extension extending into said hollow standard, a work support, a lever cooperating with the needle beneath the work support, a cross shaft mounted in a suitable bearing in one wall of the hollow standard, means located within the hollow standard for connecting said cross shaft to the needle lever extension and means for oscillating the looper from the outer end of said cross shaft, a spreader coiiperating with the looper beneath the plane of the work support and with the needle above the work support, a rock lever mounted in said hollow standard, means within said hollow standard for actuating the rock lever and devices for connecting the said rock lever with said spreader for oscillating the same.

5. A sewing machine comprising in combination, a hollow standard, an overhanging arm. carried thereby, a needle bar carrying said needle and reciprocating in said overhanging arm, a needle lever for reciprocating the needle, said needle lever having an extension extending into said hollow standard, a work support, a lever coiiperating with the needle beneath the work support, a cross shaft mounted in a suitable caring in one wall of the hollow standard, means located within the hollow standard for connecting said cross shaft to the needle lever extension and means for oscillating the looper from the outer end of said cross shaft, a spreader cotiperating with the looper beneath the plane of the work support and with the needle above the work support, a rock lever mounted in said hollow standard, means within said hollow standard for actuating the rock lever and devices for connecting the said rock lever with said spreader for oscillating the same, said devices for oscillating the spreader including toggle links movable substantially into alinement when the spreader is at the rear end of its stroke.

6. A sewing machine comprising in combination, a hollow standard, an overhanging 5 uh extension "extending i'hto isaidhollow 21 1 standard, jmeans l located \v'bhin the hoHow 1'5itheiooperbeneath the plane df the Work supportend with hh'e needle-above the worksu'pport, a 1 rock F18 ver' meumed Y in said hollow standard; meanswithin saidhollow st'anflard rws sso fckmfiecting' -'-the said "reek l ver "with *said spreader "for oscillating the sa'ine, fsaldf deinent when the 'spreader'is at t-hei eei-r'end 'of its ti' 'e'ke- Said means fol: "ocil'latingi the cross shaft from the needle le er ekter'i'sidn Sti'hke for giving "a 'dWell thereto.

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